Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Shared application/kernel submission and completion ring pairs, for |
| 4 | * supporting fast/efficient IO. |
| 5 | * |
| 6 | * A note on the read/write ordering memory barriers that are matched between |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 7 | * the application and kernel side. |
| 8 | * |
| 9 | * After the application reads the CQ ring tail, it must use an |
| 10 | * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses |
| 11 | * before writing the tail (using smp_load_acquire to read the tail will |
| 12 | * do). It also needs a smp_mb() before updating CQ head (ordering the |
| 13 | * entry load(s) with the head store), pairing with an implicit barrier |
Pavel Begunkov | d068b50 | 2021-05-16 22:58:11 +0100 | [diff] [blame] | 14 | * through a control-dependency in io_get_cqe (smp_store_release to |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 15 | * store head will do). Failure to do so could lead to reading invalid |
| 16 | * CQ entries. |
| 17 | * |
| 18 | * Likewise, the application must use an appropriate smp_wmb() before |
| 19 | * writing the SQ tail (ordering SQ entry stores with the tail store), |
| 20 | * which pairs with smp_load_acquire in io_get_sqring (smp_store_release |
| 21 | * to store the tail will do). And it needs a barrier ordering the SQ |
| 22 | * head load before writing new SQ entries (smp_load_acquire to read |
| 23 | * head will do). |
| 24 | * |
| 25 | * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application |
| 26 | * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* |
| 27 | * updating the SQ tail; a full memory barrier smp_mb() is needed |
| 28 | * between. |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 29 | * |
| 30 | * Also see the examples in the liburing library: |
| 31 | * |
| 32 | * git://git.kernel.dk/liburing |
| 33 | * |
| 34 | * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens |
| 35 | * from data shared between the kernel and application. This is done both |
| 36 | * for ordering purposes, but also to ensure that once a value is loaded from |
| 37 | * data that the application could potentially modify, it remains stable. |
| 38 | * |
| 39 | * Copyright (C) 2018-2019 Jens Axboe |
Christoph Hellwig | c992fe2 | 2019-01-11 09:43:02 -0700 | [diff] [blame] | 40 | * Copyright (c) 2018-2019 Christoph Hellwig |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 41 | */ |
| 42 | #include <linux/kernel.h> |
| 43 | #include <linux/init.h> |
| 44 | #include <linux/errno.h> |
| 45 | #include <linux/syscalls.h> |
| 46 | #include <linux/compat.h> |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 47 | #include <net/compat.h> |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 48 | #include <linux/refcount.h> |
| 49 | #include <linux/uio.h> |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 50 | #include <linux/bits.h> |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 51 | |
| 52 | #include <linux/sched/signal.h> |
| 53 | #include <linux/fs.h> |
| 54 | #include <linux/file.h> |
| 55 | #include <linux/fdtable.h> |
| 56 | #include <linux/mm.h> |
| 57 | #include <linux/mman.h> |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 58 | #include <linux/percpu.h> |
| 59 | #include <linux/slab.h> |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 60 | #include <linux/blkdev.h> |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 61 | #include <linux/bvec.h> |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 62 | #include <linux/net.h> |
| 63 | #include <net/sock.h> |
| 64 | #include <net/af_unix.h> |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 65 | #include <net/scm.h> |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 66 | #include <linux/anon_inodes.h> |
| 67 | #include <linux/sched/mm.h> |
| 68 | #include <linux/uaccess.h> |
| 69 | #include <linux/nospec.h> |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 70 | #include <linux/sizes.h> |
| 71 | #include <linux/hugetlb.h> |
Jens Axboe | aa4c396 | 2019-11-29 10:14:00 -0700 | [diff] [blame] | 72 | #include <linux/highmem.h> |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 73 | #include <linux/namei.h> |
| 74 | #include <linux/fsnotify.h> |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 75 | #include <linux/fadvise.h> |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 76 | #include <linux/eventpoll.h> |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 77 | #include <linux/splice.h> |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 78 | #include <linux/task_work.h> |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 79 | #include <linux/pagemap.h> |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 80 | #include <linux/io_uring.h> |
Nadav Amit | ef98eb0 | 2021-08-07 17:13:41 -0700 | [diff] [blame] | 81 | #include <linux/tracehook.h> |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 82 | #include <linux/audit.h> |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 83 | |
Dmitrii Dolgov | c826bd7 | 2019-10-15 19:02:01 +0200 | [diff] [blame] | 84 | #define CREATE_TRACE_POINTS |
| 85 | #include <trace/events/io_uring.h> |
| 86 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 87 | #include <uapi/linux/io_uring.h> |
| 88 | |
| 89 | #include "internal.h" |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 90 | #include "io-wq.h" |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 91 | |
Daniel Xu | 5277dea | 2019-09-14 14:23:45 -0700 | [diff] [blame] | 92 | #define IORING_MAX_ENTRIES 32768 |
Jens Axboe | 33a107f | 2019-10-04 12:10:03 -0600 | [diff] [blame] | 93 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
Olivier Langlois | 4ce8ad9 | 2021-06-23 11:50:18 -0700 | [diff] [blame] | 94 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
Jens Axboe | 65e19f5 | 2019-10-26 07:20:21 -0600 | [diff] [blame] | 95 | |
wangyangbo | 187f08c | 2021-08-19 13:56:57 +0800 | [diff] [blame] | 96 | /* only define max */ |
Pavel Begunkov | 042b0d8 | 2021-08-09 13:04:01 +0100 | [diff] [blame] | 97 | #define IORING_MAX_FIXED_FILES (1U << 15) |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 98 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
| 99 | IORING_REGISTER_LAST + IORING_OP_LAST) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 100 | |
wangyangbo | 187f08c | 2021-08-19 13:56:57 +0800 | [diff] [blame] | 101 | #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 102 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) |
| 103 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) |
| 104 | |
Pavel Begunkov | 489809e | 2021-05-14 12:06:44 +0100 | [diff] [blame] | 105 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
| 106 | |
Pavel Begunkov | b16fed66 | 2021-02-18 18:29:40 +0000 | [diff] [blame] | 107 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
| 108 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ |
| 109 | IOSQE_BUFFER_SELECT) |
Pavel Begunkov | c854357 | 2021-06-17 18:14:04 +0100 | [diff] [blame] | 110 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
| 111 | REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS) |
Pavel Begunkov | b16fed66 | 2021-02-18 18:29:40 +0000 | [diff] [blame] | 112 | |
Pavel Begunkov | 09899b1 | 2021-06-14 02:36:22 +0100 | [diff] [blame] | 113 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
| 114 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 115 | struct io_uring { |
| 116 | u32 head ____cacheline_aligned_in_smp; |
| 117 | u32 tail ____cacheline_aligned_in_smp; |
| 118 | }; |
| 119 | |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 120 | /* |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 121 | * This data is shared with the application through the mmap at offsets |
| 122 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 123 | * |
| 124 | * The offsets to the member fields are published through struct |
| 125 | * io_sqring_offsets when calling io_uring_setup. |
| 126 | */ |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 127 | struct io_rings { |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 128 | /* |
| 129 | * Head and tail offsets into the ring; the offsets need to be |
| 130 | * masked to get valid indices. |
| 131 | * |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 132 | * The kernel controls head of the sq ring and the tail of the cq ring, |
| 133 | * and the application controls tail of the sq ring and the head of the |
| 134 | * cq ring. |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 135 | */ |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 136 | struct io_uring sq, cq; |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 137 | /* |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 138 | * Bitmasks to apply to head and tail offsets (constant, equals |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 139 | * ring_entries - 1) |
| 140 | */ |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 141 | u32 sq_ring_mask, cq_ring_mask; |
| 142 | /* Ring sizes (constant, power of 2) */ |
| 143 | u32 sq_ring_entries, cq_ring_entries; |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 144 | /* |
| 145 | * Number of invalid entries dropped by the kernel due to |
| 146 | * invalid index stored in array |
| 147 | * |
| 148 | * Written by the kernel, shouldn't be modified by the |
| 149 | * application (i.e. get number of "new events" by comparing to |
| 150 | * cached value). |
| 151 | * |
| 152 | * After a new SQ head value was read by the application this |
| 153 | * counter includes all submissions that were dropped reaching |
| 154 | * the new SQ head (and possibly more). |
| 155 | */ |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 156 | u32 sq_dropped; |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 157 | /* |
Stefano Garzarella | 0d9b5b3 | 2020-05-15 18:38:04 +0200 | [diff] [blame] | 158 | * Runtime SQ flags |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 159 | * |
| 160 | * Written by the kernel, shouldn't be modified by the |
| 161 | * application. |
| 162 | * |
| 163 | * The application needs a full memory barrier before checking |
| 164 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. |
| 165 | */ |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 166 | u32 sq_flags; |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 167 | /* |
Stefano Garzarella | 0d9b5b3 | 2020-05-15 18:38:04 +0200 | [diff] [blame] | 168 | * Runtime CQ flags |
| 169 | * |
| 170 | * Written by the application, shouldn't be modified by the |
| 171 | * kernel. |
| 172 | */ |
Pavel Begunkov | fe7e325 | 2021-06-24 15:09:57 +0100 | [diff] [blame] | 173 | u32 cq_flags; |
Stefano Garzarella | 0d9b5b3 | 2020-05-15 18:38:04 +0200 | [diff] [blame] | 174 | /* |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 175 | * Number of completion events lost because the queue was full; |
| 176 | * this should be avoided by the application by making sure |
LimingWu | 0b4295b | 2019-12-05 20:18:18 +0800 | [diff] [blame] | 177 | * there are not more requests pending than there is space in |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 178 | * the completion queue. |
| 179 | * |
| 180 | * Written by the kernel, shouldn't be modified by the |
| 181 | * application (i.e. get number of "new events" by comparing to |
| 182 | * cached value). |
| 183 | * |
| 184 | * As completion events come in out of order this counter is not |
| 185 | * ordered with any other data. |
| 186 | */ |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 187 | u32 cq_overflow; |
Stefan Bühler | 1e84b97 | 2019-04-24 23:54:16 +0200 | [diff] [blame] | 188 | /* |
| 189 | * Ring buffer of completion events. |
| 190 | * |
| 191 | * The kernel writes completion events fresh every time they are |
| 192 | * produced, so the application is allowed to modify pending |
| 193 | * entries. |
| 194 | */ |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 195 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 196 | }; |
| 197 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 198 | enum io_uring_cmd_flags { |
| 199 | IO_URING_F_NONBLOCK = 1, |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 200 | IO_URING_F_COMPLETE_DEFER = 2, |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 201 | }; |
| 202 | |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 203 | struct io_mapped_ubuf { |
| 204 | u64 ubuf; |
Pavel Begunkov | 4751f53 | 2021-04-01 15:43:55 +0100 | [diff] [blame] | 205 | u64 ubuf_end; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 206 | unsigned int nr_bvecs; |
Jens Axboe | de29393 | 2020-09-17 16:19:16 -0600 | [diff] [blame] | 207 | unsigned long acct_pages; |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 208 | struct bio_vec bvec[]; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 209 | }; |
| 210 | |
Bijan Mottahedeh | 5023853 | 2021-01-15 17:37:45 +0000 | [diff] [blame] | 211 | struct io_ring_ctx; |
| 212 | |
Pavel Begunkov | 6c2450a | 2021-02-23 12:40:22 +0000 | [diff] [blame] | 213 | struct io_overflow_cqe { |
| 214 | struct io_uring_cqe cqe; |
| 215 | struct list_head list; |
| 216 | }; |
| 217 | |
Pavel Begunkov | a04b0ac | 2021-04-01 15:44:04 +0100 | [diff] [blame] | 218 | struct io_fixed_file { |
| 219 | /* file * with additional FFS_* flags */ |
| 220 | unsigned long file_ptr; |
| 221 | }; |
| 222 | |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 223 | struct io_rsrc_put { |
| 224 | struct list_head list; |
Pavel Begunkov | b60c8dc | 2021-04-25 14:32:18 +0100 | [diff] [blame] | 225 | u64 tag; |
Bijan Mottahedeh | 5023853 | 2021-01-15 17:37:45 +0000 | [diff] [blame] | 226 | union { |
| 227 | void *rsrc; |
| 228 | struct file *file; |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 229 | struct io_mapped_ubuf *buf; |
Bijan Mottahedeh | 5023853 | 2021-01-15 17:37:45 +0000 | [diff] [blame] | 230 | }; |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 231 | }; |
| 232 | |
Pavel Begunkov | aeca241 | 2021-04-11 01:46:37 +0100 | [diff] [blame] | 233 | struct io_file_table { |
Pavel Begunkov | 042b0d8 | 2021-08-09 13:04:01 +0100 | [diff] [blame] | 234 | struct io_fixed_file *files; |
Jens Axboe | 31b5151 | 2019-01-18 22:56:34 -0700 | [diff] [blame] | 235 | }; |
| 236 | |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 237 | struct io_rsrc_node { |
Xiaoguang Wang | 0558955 | 2020-03-31 14:05:18 +0800 | [diff] [blame] | 238 | struct percpu_ref refs; |
| 239 | struct list_head node; |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 240 | struct list_head rsrc_list; |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 241 | struct io_rsrc_data *rsrc_data; |
Jens Axboe | 4a38aed2 | 2020-05-14 17:21:15 -0600 | [diff] [blame] | 242 | struct llist_node llist; |
Pavel Begunkov | e297822 | 2020-11-18 14:56:26 +0000 | [diff] [blame] | 243 | bool done; |
Xiaoguang Wang | 0558955 | 2020-03-31 14:05:18 +0800 | [diff] [blame] | 244 | }; |
| 245 | |
Pavel Begunkov | 40ae0ff | 2021-04-01 15:43:44 +0100 | [diff] [blame] | 246 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
| 247 | |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 248 | struct io_rsrc_data { |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 249 | struct io_ring_ctx *ctx; |
| 250 | |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 251 | u64 **tags; |
| 252 | unsigned int nr; |
Pavel Begunkov | 40ae0ff | 2021-04-01 15:43:44 +0100 | [diff] [blame] | 253 | rsrc_put_fn *do_put; |
Pavel Begunkov | 3e94249 | 2021-04-11 01:46:34 +0100 | [diff] [blame] | 254 | atomic_t refs; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 255 | struct completion done; |
Hao Xu | 8bad28d | 2021-02-19 17:19:36 +0800 | [diff] [blame] | 256 | bool quiesce; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 257 | }; |
| 258 | |
Jens Axboe | 5a2e745 | 2020-02-23 16:23:11 -0700 | [diff] [blame] | 259 | struct io_buffer { |
| 260 | struct list_head list; |
| 261 | __u64 addr; |
Thadeu Lima de Souza Cascardo | d1f8280 | 2021-05-05 09:47:06 -0300 | [diff] [blame] | 262 | __u32 len; |
Jens Axboe | 5a2e745 | 2020-02-23 16:23:11 -0700 | [diff] [blame] | 263 | __u16 bid; |
| 264 | }; |
| 265 | |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 266 | struct io_restriction { |
| 267 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); |
| 268 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); |
| 269 | u8 sqe_flags_allowed; |
| 270 | u8 sqe_flags_required; |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 271 | bool registered; |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 272 | }; |
| 273 | |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 274 | enum { |
| 275 | IO_SQ_THREAD_SHOULD_STOP = 0, |
| 276 | IO_SQ_THREAD_SHOULD_PARK, |
| 277 | }; |
| 278 | |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 279 | struct io_sq_data { |
| 280 | refcount_t refs; |
Pavel Begunkov | 9e138a4 | 2021-03-14 20:57:12 +0000 | [diff] [blame] | 281 | atomic_t park_pending; |
Pavel Begunkov | 09a6f4e | 2021-03-14 20:57:10 +0000 | [diff] [blame] | 282 | struct mutex lock; |
Jens Axboe | 69fb213 | 2020-09-14 11:16:23 -0600 | [diff] [blame] | 283 | |
| 284 | /* ctx's that are using this sqd */ |
| 285 | struct list_head ctx_list; |
Jens Axboe | 69fb213 | 2020-09-14 11:16:23 -0600 | [diff] [blame] | 286 | |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 287 | struct task_struct *thread; |
| 288 | struct wait_queue_head wait; |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 289 | |
| 290 | unsigned sq_thread_idle; |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 291 | int sq_cpu; |
| 292 | pid_t task_pid; |
Jens Axboe | 5c2469e | 2021-03-11 10:17:56 -0700 | [diff] [blame] | 293 | pid_t task_tgid; |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 294 | |
| 295 | unsigned long state; |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 296 | struct completion exited; |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 297 | }; |
| 298 | |
Pavel Begunkov | 6dd0be1 | 2021-02-10 00:03:13 +0000 | [diff] [blame] | 299 | #define IO_COMPL_BATCH 32 |
Pavel Begunkov | 6ff119a | 2021-02-10 00:03:18 +0000 | [diff] [blame] | 300 | #define IO_REQ_CACHE_SIZE 32 |
Pavel Begunkov | bf019da | 2021-02-10 00:03:17 +0000 | [diff] [blame] | 301 | #define IO_REQ_ALLOC_BATCH 8 |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 302 | |
Pavel Begunkov | a1ab7b3 | 2021-02-18 18:29:42 +0000 | [diff] [blame] | 303 | struct io_submit_link { |
| 304 | struct io_kiocb *head; |
| 305 | struct io_kiocb *last; |
| 306 | }; |
| 307 | |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 308 | struct io_submit_state { |
| 309 | struct blk_plug plug; |
Pavel Begunkov | a1ab7b3 | 2021-02-18 18:29:42 +0000 | [diff] [blame] | 310 | struct io_submit_link link; |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 311 | |
| 312 | /* |
| 313 | * io_kiocb alloc cache |
| 314 | */ |
Pavel Begunkov | bf019da | 2021-02-10 00:03:17 +0000 | [diff] [blame] | 315 | void *reqs[IO_REQ_CACHE_SIZE]; |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 316 | unsigned int free_reqs; |
| 317 | |
| 318 | bool plug_started; |
| 319 | |
| 320 | /* |
| 321 | * Batch completion logic |
| 322 | */ |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 323 | struct io_kiocb *compl_reqs[IO_COMPL_BATCH]; |
| 324 | unsigned int compl_nr; |
| 325 | /* inline/task_work completion list, under ->uring_lock */ |
| 326 | struct list_head free_list; |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 327 | |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 328 | unsigned int ios_left; |
| 329 | }; |
| 330 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 331 | struct io_ring_ctx { |
Pavel Begunkov | b52ecf8 | 2021-06-14 23:37:21 +0100 | [diff] [blame] | 332 | /* const or read-mostly hot data */ |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 333 | struct { |
| 334 | struct percpu_ref refs; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 335 | |
Pavel Begunkov | b52ecf8 | 2021-06-14 23:37:21 +0100 | [diff] [blame] | 336 | struct io_rings *rings; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 337 | unsigned int flags; |
Randy Dunlap | e1d8533 | 2020-02-05 20:57:10 -0800 | [diff] [blame] | 338 | unsigned int compat: 1; |
Randy Dunlap | e1d8533 | 2020-02-05 20:57:10 -0800 | [diff] [blame] | 339 | unsigned int drain_next: 1; |
| 340 | unsigned int eventfd_async: 1; |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 341 | unsigned int restricted: 1; |
Pavel Begunkov | f18ee4c | 2021-06-14 23:37:25 +0100 | [diff] [blame] | 342 | unsigned int off_timeout_used: 1; |
Pavel Begunkov | 10c6690 | 2021-06-15 16:47:56 +0100 | [diff] [blame] | 343 | unsigned int drain_active: 1; |
Pavel Begunkov | b52ecf8 | 2021-06-14 23:37:21 +0100 | [diff] [blame] | 344 | } ____cacheline_aligned_in_smp; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 345 | |
Pavel Begunkov | 7f1129d | 2021-06-14 23:37:22 +0100 | [diff] [blame] | 346 | /* submission data */ |
Pavel Begunkov | b52ecf8 | 2021-06-14 23:37:21 +0100 | [diff] [blame] | 347 | struct { |
Pavel Begunkov | 0499e58 | 2021-06-14 23:37:29 +0100 | [diff] [blame] | 348 | struct mutex uring_lock; |
| 349 | |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 350 | /* |
| 351 | * Ring buffer of indices into array of io_uring_sqe, which is |
| 352 | * mmapped by the application using the IORING_OFF_SQES offset. |
| 353 | * |
| 354 | * This indirection could e.g. be used to assign fixed |
| 355 | * io_uring_sqe entries to operations and only submit them to |
| 356 | * the queue when needed. |
| 357 | * |
| 358 | * The kernel modifies neither the indices array nor the entries |
| 359 | * array. |
| 360 | */ |
| 361 | u32 *sq_array; |
Pavel Begunkov | c7af47c | 2021-06-14 23:37:20 +0100 | [diff] [blame] | 362 | struct io_uring_sqe *sq_sqes; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 363 | unsigned cached_sq_head; |
| 364 | unsigned sq_entries; |
Jens Axboe | de0617e | 2019-04-06 21:51:27 -0600 | [diff] [blame] | 365 | struct list_head defer_list; |
Pavel Begunkov | 7f1129d | 2021-06-14 23:37:22 +0100 | [diff] [blame] | 366 | |
| 367 | /* |
| 368 | * Fixed resources fast path, should be accessed only under |
| 369 | * uring_lock, and updated through io_uring_register(2) |
| 370 | */ |
| 371 | struct io_rsrc_node *rsrc_node; |
| 372 | struct io_file_table file_table; |
| 373 | unsigned nr_user_files; |
| 374 | unsigned nr_user_bufs; |
| 375 | struct io_mapped_ubuf **user_bufs; |
| 376 | |
| 377 | struct io_submit_state submit_state; |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 378 | struct list_head timeout_list; |
Pavel Begunkov | ef9dd63 | 2021-08-28 19:54:38 -0600 | [diff] [blame] | 379 | struct list_head ltimeout_list; |
Jens Axboe | 1d7bb1d | 2019-11-06 11:31:17 -0700 | [diff] [blame] | 380 | struct list_head cq_overflow_list; |
Pavel Begunkov | 7f1129d | 2021-06-14 23:37:22 +0100 | [diff] [blame] | 381 | struct xarray io_buffers; |
| 382 | struct xarray personalities; |
| 383 | u32 pers_next; |
| 384 | unsigned sq_thread_idle; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 385 | } ____cacheline_aligned_in_smp; |
| 386 | |
Pavel Begunkov | d0acdee | 2021-05-16 22:58:12 +0100 | [diff] [blame] | 387 | /* IRQ completion list, under ->completion_lock */ |
| 388 | struct list_head locked_free_list; |
| 389 | unsigned int locked_free_nr; |
Jens Axboe | 3c1a2ea | 2021-02-11 10:48:03 -0700 | [diff] [blame] | 390 | |
Stefan Metzmacher | 7c30f36a | 2021-03-07 11:54:28 +0100 | [diff] [blame] | 391 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 392 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
| 393 | |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 394 | struct wait_queue_head sqo_sq_wait; |
Jens Axboe | 69fb213 | 2020-09-14 11:16:23 -0600 | [diff] [blame] | 395 | struct list_head sqd_list; |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 396 | |
Pavel Begunkov | 5ed7a37 | 2021-06-14 23:37:27 +0100 | [diff] [blame] | 397 | unsigned long check_cq_overflow; |
| 398 | |
Jens Axboe | 206aefd | 2019-11-07 18:27:42 -0700 | [diff] [blame] | 399 | struct { |
| 400 | unsigned cached_cq_tail; |
| 401 | unsigned cq_entries; |
Jens Axboe | 206aefd | 2019-11-07 18:27:42 -0700 | [diff] [blame] | 402 | struct eventfd_ctx *cq_ev_fd; |
Pavel Begunkov | 0499e58 | 2021-06-14 23:37:29 +0100 | [diff] [blame] | 403 | struct wait_queue_head poll_wait; |
| 404 | struct wait_queue_head cq_wait; |
| 405 | unsigned cq_extra; |
| 406 | atomic_t cq_timeouts; |
| 407 | struct fasync_struct *cq_fasync; |
| 408 | unsigned cq_last_tm_flush; |
Jens Axboe | 206aefd | 2019-11-07 18:27:42 -0700 | [diff] [blame] | 409 | } ____cacheline_aligned_in_smp; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 410 | |
| 411 | struct { |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 412 | spinlock_t completion_lock; |
Jens Axboe | e94f141 | 2019-12-19 12:06:02 -0700 | [diff] [blame] | 413 | |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 414 | spinlock_t timeout_lock; |
| 415 | |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 416 | /* |
Pavel Begunkov | 540e32a | 2020-07-13 23:37:09 +0300 | [diff] [blame] | 417 | * ->iopoll_list is protected by the ctx->uring_lock for |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 418 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
| 419 | * For SQPOLL, only the single threaded io_sq_thread() will |
| 420 | * manipulate the list, hence no extra locking is needed there. |
| 421 | */ |
Pavel Begunkov | 540e32a | 2020-07-13 23:37:09 +0300 | [diff] [blame] | 422 | struct list_head iopoll_list; |
Jens Axboe | 78076bb | 2019-12-04 19:56:40 -0700 | [diff] [blame] | 423 | struct hlist_head *cancel_hash; |
| 424 | unsigned cancel_hash_bits; |
Hao Xu | 915b3dd | 2021-06-28 05:37:30 +0800 | [diff] [blame] | 425 | bool poll_multi_queue; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 426 | } ____cacheline_aligned_in_smp; |
Jens Axboe | 85faa7b | 2020-04-09 18:14:00 -0600 | [diff] [blame] | 427 | |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 428 | struct io_restriction restrictions; |
Jens Axboe | 3c1a2ea | 2021-02-11 10:48:03 -0700 | [diff] [blame] | 429 | |
Pavel Begunkov | b13a891 | 2021-05-16 22:58:07 +0100 | [diff] [blame] | 430 | /* slow path rsrc auxilary data, used by update/register */ |
| 431 | struct { |
| 432 | struct io_rsrc_node *rsrc_backup_node; |
| 433 | struct io_mapped_ubuf *dummy_ubuf; |
| 434 | struct io_rsrc_data *file_data; |
| 435 | struct io_rsrc_data *buf_data; |
| 436 | |
| 437 | struct delayed_work rsrc_put_work; |
| 438 | struct llist_head rsrc_put_llist; |
| 439 | struct list_head rsrc_ref_list; |
| 440 | spinlock_t rsrc_ref_lock; |
| 441 | }; |
| 442 | |
Jens Axboe | 3c1a2ea | 2021-02-11 10:48:03 -0700 | [diff] [blame] | 443 | /* Keep this last, we don't need it for the fast path */ |
Pavel Begunkov | b986af7 | 2021-05-16 22:58:06 +0100 | [diff] [blame] | 444 | struct { |
| 445 | #if defined(CONFIG_UNIX) |
| 446 | struct socket *ring_sock; |
| 447 | #endif |
| 448 | /* hashed buffered write serialization */ |
| 449 | struct io_wq_hash *hash_map; |
| 450 | |
| 451 | /* Only used for accounting purposes */ |
| 452 | struct user_struct *user; |
| 453 | struct mm_struct *mm_account; |
| 454 | |
| 455 | /* ctx exit and cancelation */ |
Pavel Begunkov | 9011bf9 | 2021-06-30 21:54:03 +0100 | [diff] [blame] | 456 | struct llist_head fallback_llist; |
| 457 | struct delayed_work fallback_work; |
Pavel Begunkov | b986af7 | 2021-05-16 22:58:06 +0100 | [diff] [blame] | 458 | struct work_struct exit_work; |
| 459 | struct list_head tctx_list; |
| 460 | struct completion ref_comp; |
| 461 | }; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 462 | }; |
| 463 | |
Stefan Metzmacher | 53e043b | 2021-03-15 12:56:56 +0100 | [diff] [blame] | 464 | struct io_uring_task { |
| 465 | /* submission side */ |
Pavel Begunkov | 09899b1 | 2021-06-14 02:36:22 +0100 | [diff] [blame] | 466 | int cached_refs; |
Stefan Metzmacher | 53e043b | 2021-03-15 12:56:56 +0100 | [diff] [blame] | 467 | struct xarray xa; |
| 468 | struct wait_queue_head wait; |
Stefan Metzmacher | ee53fb2 | 2021-03-15 12:56:57 +0100 | [diff] [blame] | 469 | const struct io_ring_ctx *last; |
| 470 | struct io_wq *io_wq; |
Stefan Metzmacher | 53e043b | 2021-03-15 12:56:56 +0100 | [diff] [blame] | 471 | struct percpu_counter inflight; |
Pavel Begunkov | b303fe2 | 2021-04-11 01:46:26 +0100 | [diff] [blame] | 472 | atomic_t inflight_tracked; |
Stefan Metzmacher | 53e043b | 2021-03-15 12:56:56 +0100 | [diff] [blame] | 473 | atomic_t in_idle; |
Stefan Metzmacher | 53e043b | 2021-03-15 12:56:56 +0100 | [diff] [blame] | 474 | |
| 475 | spinlock_t task_lock; |
| 476 | struct io_wq_work_list task_list; |
Stefan Metzmacher | 53e043b | 2021-03-15 12:56:56 +0100 | [diff] [blame] | 477 | struct callback_head task_work; |
Pavel Begunkov | 6294f36 | 2021-08-10 17:53:55 +0100 | [diff] [blame] | 478 | bool task_running; |
Stefan Metzmacher | 53e043b | 2021-03-15 12:56:56 +0100 | [diff] [blame] | 479 | }; |
| 480 | |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 481 | /* |
| 482 | * First field must be the file pointer in all the |
| 483 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> |
| 484 | */ |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 485 | struct io_poll_iocb { |
| 486 | struct file *file; |
Pavel Begunkov | 018043b | 2020-10-27 23:17:18 +0000 | [diff] [blame] | 487 | struct wait_queue_head *head; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 488 | __poll_t events; |
Jens Axboe | 8c83878 | 2019-03-12 15:48:16 -0600 | [diff] [blame] | 489 | bool done; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 490 | bool canceled; |
Jens Axboe | 392edb4 | 2019-12-09 17:52:20 -0700 | [diff] [blame] | 491 | struct wait_queue_entry wait; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 492 | }; |
| 493 | |
Pavel Begunkov | 9d80589 | 2021-04-13 02:58:40 +0100 | [diff] [blame] | 494 | struct io_poll_update { |
Pavel Begunkov | 018043b | 2020-10-27 23:17:18 +0000 | [diff] [blame] | 495 | struct file *file; |
Pavel Begunkov | 9d80589 | 2021-04-13 02:58:40 +0100 | [diff] [blame] | 496 | u64 old_user_data; |
| 497 | u64 new_user_data; |
| 498 | __poll_t events; |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 499 | bool update_events; |
| 500 | bool update_user_data; |
Pavel Begunkov | 018043b | 2020-10-27 23:17:18 +0000 | [diff] [blame] | 501 | }; |
| 502 | |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 503 | struct io_close { |
| 504 | struct file *file; |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 505 | int fd; |
| 506 | }; |
| 507 | |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 508 | struct io_timeout_data { |
| 509 | struct io_kiocb *req; |
| 510 | struct hrtimer timer; |
| 511 | struct timespec64 ts; |
| 512 | enum hrtimer_mode mode; |
Jens Axboe | 50c1df2 | 2021-08-27 17:11:06 -0600 | [diff] [blame] | 513 | u32 flags; |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 514 | }; |
| 515 | |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 516 | struct io_accept { |
| 517 | struct file *file; |
| 518 | struct sockaddr __user *addr; |
| 519 | int __user *addr_len; |
| 520 | int flags; |
Pavel Begunkov | aaa4db1 | 2021-08-25 12:25:47 +0100 | [diff] [blame] | 521 | u32 file_slot; |
Jens Axboe | 09952e3 | 2020-03-19 20:16:56 -0600 | [diff] [blame] | 522 | unsigned long nofile; |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 523 | }; |
| 524 | |
| 525 | struct io_sync { |
| 526 | struct file *file; |
| 527 | loff_t len; |
| 528 | loff_t off; |
| 529 | int flags; |
Jens Axboe | d63d1b5 | 2019-12-10 10:38:56 -0700 | [diff] [blame] | 530 | int mode; |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 531 | }; |
| 532 | |
Jens Axboe | fbf2384 | 2019-12-17 18:45:56 -0700 | [diff] [blame] | 533 | struct io_cancel { |
| 534 | struct file *file; |
| 535 | u64 addr; |
| 536 | }; |
| 537 | |
Jens Axboe | b29472e | 2019-12-17 18:50:29 -0700 | [diff] [blame] | 538 | struct io_timeout { |
| 539 | struct file *file; |
Pavel Begunkov | bfe68a2 | 2020-05-30 14:54:18 +0300 | [diff] [blame] | 540 | u32 off; |
| 541 | u32 target_seq; |
Pavel Begunkov | 135fcde | 2020-07-13 23:37:12 +0300 | [diff] [blame] | 542 | struct list_head list; |
Pavel Begunkov | 90cd7e4 | 2020-10-27 23:25:36 +0000 | [diff] [blame] | 543 | /* head of the link, used by linked timeouts only */ |
| 544 | struct io_kiocb *head; |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 545 | /* for linked completions */ |
| 546 | struct io_kiocb *prev; |
Jens Axboe | b29472e | 2019-12-17 18:50:29 -0700 | [diff] [blame] | 547 | }; |
| 548 | |
Pavel Begunkov | 0bdf7a2 | 2020-10-10 18:34:10 +0100 | [diff] [blame] | 549 | struct io_timeout_rem { |
| 550 | struct file *file; |
| 551 | u64 addr; |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 552 | |
| 553 | /* timeout update */ |
| 554 | struct timespec64 ts; |
| 555 | u32 flags; |
Pavel Begunkov | f1042b6 | 2021-08-28 19:54:39 -0600 | [diff] [blame] | 556 | bool ltimeout; |
Pavel Begunkov | 0bdf7a2 | 2020-10-10 18:34:10 +0100 | [diff] [blame] | 557 | }; |
| 558 | |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 559 | struct io_rw { |
| 560 | /* NOTE: kiocb has the file as the first member, so don't do it here */ |
| 561 | struct kiocb kiocb; |
| 562 | u64 addr; |
| 563 | u64 len; |
| 564 | }; |
| 565 | |
Jens Axboe | 3fbb51c | 2019-12-20 08:51:52 -0700 | [diff] [blame] | 566 | struct io_connect { |
| 567 | struct file *file; |
| 568 | struct sockaddr __user *addr; |
| 569 | int addr_len; |
| 570 | }; |
| 571 | |
Jens Axboe | e47293f | 2019-12-20 08:58:21 -0700 | [diff] [blame] | 572 | struct io_sr_msg { |
| 573 | struct file *file; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 574 | union { |
Pavel Begunkov | 4af3417 | 2021-04-11 01:46:30 +0100 | [diff] [blame] | 575 | struct compat_msghdr __user *umsg_compat; |
| 576 | struct user_msghdr __user *umsg; |
| 577 | void __user *buf; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 578 | }; |
Jens Axboe | e47293f | 2019-12-20 08:58:21 -0700 | [diff] [blame] | 579 | int msg_flags; |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 580 | int bgid; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 581 | size_t len; |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 582 | struct io_buffer *kbuf; |
Jens Axboe | e47293f | 2019-12-20 08:58:21 -0700 | [diff] [blame] | 583 | }; |
| 584 | |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 585 | struct io_open { |
| 586 | struct file *file; |
| 587 | int dfd; |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 588 | u32 file_slot; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 589 | struct filename *filename; |
Jens Axboe | c12cedf | 2020-01-08 17:41:21 -0700 | [diff] [blame] | 590 | struct open_how how; |
Jens Axboe | 4022e7a | 2020-03-19 19:23:18 -0600 | [diff] [blame] | 591 | unsigned long nofile; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 592 | }; |
| 593 | |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 594 | struct io_rsrc_update { |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 595 | struct file *file; |
| 596 | u64 arg; |
| 597 | u32 nr_args; |
| 598 | u32 offset; |
| 599 | }; |
| 600 | |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 601 | struct io_fadvise { |
| 602 | struct file *file; |
| 603 | u64 offset; |
| 604 | u32 len; |
| 605 | u32 advice; |
| 606 | }; |
| 607 | |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 608 | struct io_madvise { |
| 609 | struct file *file; |
| 610 | u64 addr; |
| 611 | u32 len; |
| 612 | u32 advice; |
| 613 | }; |
| 614 | |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 615 | struct io_epoll { |
| 616 | struct file *file; |
| 617 | int epfd; |
| 618 | int op; |
| 619 | int fd; |
| 620 | struct epoll_event event; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 621 | }; |
| 622 | |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 623 | struct io_splice { |
| 624 | struct file *file_out; |
| 625 | struct file *file_in; |
| 626 | loff_t off_out; |
| 627 | loff_t off_in; |
| 628 | u64 len; |
| 629 | unsigned int flags; |
| 630 | }; |
| 631 | |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 632 | struct io_provide_buf { |
| 633 | struct file *file; |
| 634 | __u64 addr; |
Pavel Begunkov | 38134ad | 2021-04-15 13:07:39 +0100 | [diff] [blame] | 635 | __u32 len; |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 636 | __u32 bgid; |
| 637 | __u16 nbufs; |
| 638 | __u16 bid; |
| 639 | }; |
| 640 | |
Bijan Mottahedeh | 1d9e128 | 2020-05-22 21:31:16 -0700 | [diff] [blame] | 641 | struct io_statx { |
| 642 | struct file *file; |
| 643 | int dfd; |
| 644 | unsigned int mask; |
| 645 | unsigned int flags; |
Bijan Mottahedeh | e62753e | 2020-05-22 21:31:18 -0700 | [diff] [blame] | 646 | const char __user *filename; |
Bijan Mottahedeh | 1d9e128 | 2020-05-22 21:31:16 -0700 | [diff] [blame] | 647 | struct statx __user *buffer; |
| 648 | }; |
| 649 | |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 650 | struct io_shutdown { |
| 651 | struct file *file; |
| 652 | int how; |
| 653 | }; |
| 654 | |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 655 | struct io_rename { |
| 656 | struct file *file; |
| 657 | int old_dfd; |
| 658 | int new_dfd; |
| 659 | struct filename *oldpath; |
| 660 | struct filename *newpath; |
| 661 | int flags; |
| 662 | }; |
| 663 | |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 664 | struct io_unlink { |
| 665 | struct file *file; |
| 666 | int dfd; |
| 667 | int flags; |
| 668 | struct filename *filename; |
| 669 | }; |
| 670 | |
Dmitry Kadashev | e34a02d | 2021-07-08 13:34:45 +0700 | [diff] [blame] | 671 | struct io_mkdir { |
| 672 | struct file *file; |
| 673 | int dfd; |
| 674 | umode_t mode; |
| 675 | struct filename *filename; |
| 676 | }; |
| 677 | |
Dmitry Kadashev | 7a8721f | 2021-07-08 13:34:46 +0700 | [diff] [blame] | 678 | struct io_symlink { |
| 679 | struct file *file; |
| 680 | int new_dfd; |
| 681 | struct filename *oldpath; |
| 682 | struct filename *newpath; |
| 683 | }; |
| 684 | |
Dmitry Kadashev | cf30da9 | 2021-07-08 13:34:47 +0700 | [diff] [blame] | 685 | struct io_hardlink { |
| 686 | struct file *file; |
| 687 | int old_dfd; |
| 688 | int new_dfd; |
| 689 | struct filename *oldpath; |
| 690 | struct filename *newpath; |
| 691 | int flags; |
| 692 | }; |
| 693 | |
Pavel Begunkov | 3ca405e | 2020-07-13 23:37:08 +0300 | [diff] [blame] | 694 | struct io_completion { |
| 695 | struct file *file; |
Pavel Begunkov | 8c3f9cd | 2021-02-28 22:35:15 +0000 | [diff] [blame] | 696 | u32 cflags; |
Pavel Begunkov | 3ca405e | 2020-07-13 23:37:08 +0300 | [diff] [blame] | 697 | }; |
| 698 | |
Jens Axboe | f499a02 | 2019-12-02 16:28:46 -0700 | [diff] [blame] | 699 | struct io_async_connect { |
| 700 | struct sockaddr_storage address; |
| 701 | }; |
| 702 | |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 703 | struct io_async_msghdr { |
| 704 | struct iovec fast_iov[UIO_FASTIOV]; |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 705 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
| 706 | struct iovec *free_iov; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 707 | struct sockaddr __user *uaddr; |
| 708 | struct msghdr msg; |
Jens Axboe | b537916 | 2020-02-09 11:29:15 -0700 | [diff] [blame] | 709 | struct sockaddr_storage addr; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 710 | }; |
| 711 | |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 712 | struct io_async_rw { |
| 713 | struct iovec fast_iov[UIO_FASTIOV]; |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 714 | const struct iovec *free_iovec; |
| 715 | struct iov_iter iter; |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 716 | size_t bytes_done; |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 717 | struct wait_page_queue wpq; |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 718 | }; |
| 719 | |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 720 | enum { |
| 721 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, |
| 722 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, |
| 723 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, |
| 724 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, |
| 725 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 726 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 727 | |
Pavel Begunkov | dddca22 | 2021-04-27 16:13:52 +0100 | [diff] [blame] | 728 | /* first byte is taken by user flags, shift it to not overlap */ |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 729 | REQ_F_FAIL_BIT = 8, |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 730 | REQ_F_INFLIGHT_BIT, |
| 731 | REQ_F_CUR_POS_BIT, |
| 732 | REQ_F_NOWAIT_BIT, |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 733 | REQ_F_LINK_TIMEOUT_BIT, |
Pavel Begunkov | 99bc4c3 | 2020-02-07 22:04:45 +0300 | [diff] [blame] | 734 | REQ_F_NEED_CLEANUP_BIT, |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 735 | REQ_F_POLLED_BIT, |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 736 | REQ_F_BUFFER_SELECTED_BIT, |
Pavel Begunkov | e342c80 | 2021-01-19 13:32:47 +0000 | [diff] [blame] | 737 | REQ_F_COMPLETE_INLINE_BIT, |
Jens Axboe | 230d50d | 2021-04-01 20:41:15 -0600 | [diff] [blame] | 738 | REQ_F_REISSUE_BIT, |
Pavel Begunkov | 8c13082 | 2021-03-22 01:58:32 +0000 | [diff] [blame] | 739 | REQ_F_DONT_REISSUE_BIT, |
Pavel Begunkov | b8e64b5 | 2021-06-17 18:14:02 +0100 | [diff] [blame] | 740 | REQ_F_CREDS_BIT, |
Pavel Begunkov | 20e60a3 | 2021-08-11 19:28:30 +0100 | [diff] [blame] | 741 | REQ_F_REFCOUNT_BIT, |
Pavel Begunkov | 4d13d1a | 2021-08-15 10:40:24 +0100 | [diff] [blame] | 742 | REQ_F_ARM_LTIMEOUT_BIT, |
Jens Axboe | 7b29f92 | 2021-03-12 08:30:14 -0700 | [diff] [blame] | 743 | /* keep async read/write and isreg together and in order */ |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 744 | REQ_F_NOWAIT_READ_BIT, |
| 745 | REQ_F_NOWAIT_WRITE_BIT, |
Jens Axboe | 7b29f92 | 2021-03-12 08:30:14 -0700 | [diff] [blame] | 746 | REQ_F_ISREG_BIT, |
Jens Axboe | 8455787 | 2020-03-03 15:28:17 -0700 | [diff] [blame] | 747 | |
| 748 | /* not a real bit, just to check we're not overflowing the space */ |
| 749 | __REQ_F_LAST_BIT, |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 750 | }; |
| 751 | |
| 752 | enum { |
| 753 | /* ctx owns file */ |
| 754 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), |
| 755 | /* drain existing IO first */ |
| 756 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), |
| 757 | /* linked sqes */ |
| 758 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), |
| 759 | /* doesn't sever on completion < 0 */ |
| 760 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), |
| 761 | /* IOSQE_ASYNC */ |
| 762 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 763 | /* IOSQE_BUFFER_SELECT */ |
| 764 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 765 | |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 766 | /* fail rest of links */ |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 767 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
Pavel Begunkov | b05a1bc | 2021-03-04 13:59:24 +0000 | [diff] [blame] | 768 | /* on inflight list, should be cancelled and waited on exit reliably */ |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 769 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
| 770 | /* read/write uses file position */ |
| 771 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), |
| 772 | /* must not punt to workers */ |
| 773 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), |
Pavel Begunkov | 900fad4 | 2020-10-19 16:39:16 +0100 | [diff] [blame] | 774 | /* has or had linked timeout */ |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 775 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
Pavel Begunkov | 99bc4c3 | 2020-02-07 22:04:45 +0300 | [diff] [blame] | 776 | /* needs cleanup */ |
| 777 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 778 | /* already went through poll handler */ |
| 779 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 780 | /* buffer already selected */ |
| 781 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), |
Pavel Begunkov | e342c80 | 2021-01-19 13:32:47 +0000 | [diff] [blame] | 782 | /* completion is deferred through io_comp_state */ |
| 783 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), |
Jens Axboe | 230d50d | 2021-04-01 20:41:15 -0600 | [diff] [blame] | 784 | /* caller should reissue async */ |
| 785 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), |
Pavel Begunkov | 8c13082 | 2021-03-22 01:58:32 +0000 | [diff] [blame] | 786 | /* don't attempt request reissue, see io_rw_reissue() */ |
| 787 | REQ_F_DONT_REISSUE = BIT(REQ_F_DONT_REISSUE_BIT), |
Jens Axboe | 7b29f92 | 2021-03-12 08:30:14 -0700 | [diff] [blame] | 788 | /* supports async reads */ |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 789 | REQ_F_NOWAIT_READ = BIT(REQ_F_NOWAIT_READ_BIT), |
Jens Axboe | 7b29f92 | 2021-03-12 08:30:14 -0700 | [diff] [blame] | 790 | /* supports async writes */ |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 791 | REQ_F_NOWAIT_WRITE = BIT(REQ_F_NOWAIT_WRITE_BIT), |
Jens Axboe | 7b29f92 | 2021-03-12 08:30:14 -0700 | [diff] [blame] | 792 | /* regular file */ |
| 793 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), |
Pavel Begunkov | b8e64b5 | 2021-06-17 18:14:02 +0100 | [diff] [blame] | 794 | /* has creds assigned */ |
| 795 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), |
Pavel Begunkov | 20e60a3 | 2021-08-11 19:28:30 +0100 | [diff] [blame] | 796 | /* skip refcounting if not set */ |
| 797 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), |
Pavel Begunkov | 4d13d1a | 2021-08-15 10:40:24 +0100 | [diff] [blame] | 798 | /* there is a linked timeout that has to be armed */ |
| 799 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 800 | }; |
| 801 | |
| 802 | struct async_poll { |
| 803 | struct io_poll_iocb poll; |
Jens Axboe | 807abcb | 2020-07-17 17:09:27 -0600 | [diff] [blame] | 804 | struct io_poll_iocb *double_poll; |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 805 | }; |
| 806 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 807 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
Pavel Begunkov | 5b0a6ac | 2021-06-30 21:54:04 +0100 | [diff] [blame] | 808 | |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 809 | struct io_task_work { |
Pavel Begunkov | 5b0a6ac | 2021-06-30 21:54:04 +0100 | [diff] [blame] | 810 | union { |
| 811 | struct io_wq_work_node node; |
| 812 | struct llist_node fallback_node; |
| 813 | }; |
| 814 | io_req_tw_func_t func; |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 815 | }; |
| 816 | |
Pavel Begunkov | 992da01 | 2021-06-10 16:37:37 +0100 | [diff] [blame] | 817 | enum { |
| 818 | IORING_RSRC_FILE = 0, |
| 819 | IORING_RSRC_BUFFER = 1, |
| 820 | }; |
| 821 | |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 822 | /* |
| 823 | * NOTE! Each of the iocb union members has the file pointer |
| 824 | * as the first entry in their struct definition. So you can |
| 825 | * access the file pointer through any of the sub-structs, |
| 826 | * or directly as just 'ki_filp' in this struct. |
| 827 | */ |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 828 | struct io_kiocb { |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 829 | union { |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 830 | struct file *file; |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 831 | struct io_rw rw; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 832 | struct io_poll_iocb poll; |
Pavel Begunkov | 9d80589 | 2021-04-13 02:58:40 +0100 | [diff] [blame] | 833 | struct io_poll_update poll_update; |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 834 | struct io_accept accept; |
| 835 | struct io_sync sync; |
Jens Axboe | fbf2384 | 2019-12-17 18:45:56 -0700 | [diff] [blame] | 836 | struct io_cancel cancel; |
Jens Axboe | b29472e | 2019-12-17 18:50:29 -0700 | [diff] [blame] | 837 | struct io_timeout timeout; |
Pavel Begunkov | 0bdf7a2 | 2020-10-10 18:34:10 +0100 | [diff] [blame] | 838 | struct io_timeout_rem timeout_rem; |
Jens Axboe | 3fbb51c | 2019-12-20 08:51:52 -0700 | [diff] [blame] | 839 | struct io_connect connect; |
Jens Axboe | e47293f | 2019-12-20 08:58:21 -0700 | [diff] [blame] | 840 | struct io_sr_msg sr_msg; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 841 | struct io_open open; |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 842 | struct io_close close; |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 843 | struct io_rsrc_update rsrc_update; |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 844 | struct io_fadvise fadvise; |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 845 | struct io_madvise madvise; |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 846 | struct io_epoll epoll; |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 847 | struct io_splice splice; |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 848 | struct io_provide_buf pbuf; |
Bijan Mottahedeh | 1d9e128 | 2020-05-22 21:31:16 -0700 | [diff] [blame] | 849 | struct io_statx statx; |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 850 | struct io_shutdown shutdown; |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 851 | struct io_rename rename; |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 852 | struct io_unlink unlink; |
Dmitry Kadashev | e34a02d | 2021-07-08 13:34:45 +0700 | [diff] [blame] | 853 | struct io_mkdir mkdir; |
Dmitry Kadashev | 7a8721f | 2021-07-08 13:34:46 +0700 | [diff] [blame] | 854 | struct io_symlink symlink; |
Dmitry Kadashev | cf30da9 | 2021-07-08 13:34:47 +0700 | [diff] [blame] | 855 | struct io_hardlink hardlink; |
Pavel Begunkov | 3ca405e | 2020-07-13 23:37:08 +0300 | [diff] [blame] | 856 | /* use only after cleaning per-op data, see io_clean_op() */ |
| 857 | struct io_completion compl; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 858 | }; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 859 | |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 860 | /* opcode allocated if it needs to store data for async defer */ |
| 861 | void *async_data; |
Jens Axboe | d625c6e | 2019-12-17 19:53:05 -0700 | [diff] [blame] | 862 | u8 opcode; |
Xiaoguang Wang | 65a6543 | 2020-06-11 23:39:36 +0800 | [diff] [blame] | 863 | /* polled IO has completed */ |
| 864 | u8 iopoll_completed; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 865 | |
Bijan Mottahedeh | 4f4eeba | 2020-05-19 14:52:49 -0700 | [diff] [blame] | 866 | u16 buf_index; |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 867 | u32 result; |
Bijan Mottahedeh | 4f4eeba | 2020-05-19 14:52:49 -0700 | [diff] [blame] | 868 | |
Pavel Begunkov | 010e8e6 | 2020-07-30 18:43:45 +0300 | [diff] [blame] | 869 | struct io_ring_ctx *ctx; |
| 870 | unsigned int flags; |
Jens Axboe | abc54d6 | 2021-02-24 13:32:30 -0700 | [diff] [blame] | 871 | atomic_t refs; |
Pavel Begunkov | 010e8e6 | 2020-07-30 18:43:45 +0300 | [diff] [blame] | 872 | struct task_struct *task; |
| 873 | u64 user_data; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 874 | |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 875 | struct io_kiocb *link; |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 876 | struct percpu_ref *fixed_rsrc_refs; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 877 | |
Pavel Begunkov | b303fe2 | 2021-04-11 01:46:26 +0100 | [diff] [blame] | 878 | /* used with ctx->iopoll_list with reads/writes */ |
Pavel Begunkov | 010e8e6 | 2020-07-30 18:43:45 +0300 | [diff] [blame] | 879 | struct list_head inflight_entry; |
Pavel Begunkov | 5b0a6ac | 2021-06-30 21:54:04 +0100 | [diff] [blame] | 880 | struct io_task_work io_task_work; |
Pavel Begunkov | 010e8e6 | 2020-07-30 18:43:45 +0300 | [diff] [blame] | 881 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
| 882 | struct hlist_node hash_node; |
| 883 | struct async_poll *apoll; |
| 884 | struct io_wq_work work; |
Pavel Begunkov | fe7e325 | 2021-06-24 15:09:57 +0100 | [diff] [blame] | 885 | const struct cred *creds; |
Pavel Begunkov | c10d1f9 | 2021-06-17 18:14:01 +0100 | [diff] [blame] | 886 | |
Pavel Begunkov | eae071c | 2021-04-25 14:32:24 +0100 | [diff] [blame] | 887 | /* store used ubuf, so we can prevent reloading */ |
| 888 | struct io_mapped_ubuf *imu; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 889 | }; |
| 890 | |
Pavel Begunkov | 13bf43f | 2021-03-06 11:02:12 +0000 | [diff] [blame] | 891 | struct io_tctx_node { |
| 892 | struct list_head ctx_node; |
| 893 | struct task_struct *task; |
Pavel Begunkov | 13bf43f | 2021-03-06 11:02:12 +0000 | [diff] [blame] | 894 | struct io_ring_ctx *ctx; |
| 895 | }; |
| 896 | |
Pavel Begunkov | 27dc833 | 2020-07-13 23:37:14 +0300 | [diff] [blame] | 897 | struct io_defer_entry { |
| 898 | struct list_head list; |
| 899 | struct io_kiocb *req; |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 900 | u32 seq; |
Pavel Begunkov | 27dc833 | 2020-07-13 23:37:14 +0300 | [diff] [blame] | 901 | }; |
| 902 | |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 903 | struct io_op_def { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 904 | /* needs req->file assigned */ |
| 905 | unsigned needs_file : 1; |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 906 | /* hash wq insertion if file is a regular file */ |
| 907 | unsigned hash_reg_file : 1; |
| 908 | /* unbound wq insertion if file is a non-regular file */ |
| 909 | unsigned unbound_nonreg_file : 1; |
Jens Axboe | 66f4af9 | 2020-01-16 15:36:52 -0700 | [diff] [blame] | 910 | /* opcode is not supported by this kernel */ |
| 911 | unsigned not_supported : 1; |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 912 | /* set if opcode supports polled "wait" */ |
| 913 | unsigned pollin : 1; |
| 914 | unsigned pollout : 1; |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 915 | /* op supports buffer selection */ |
| 916 | unsigned buffer_select : 1; |
Pavel Begunkov | 26f0505 | 2021-02-28 22:35:18 +0000 | [diff] [blame] | 917 | /* do prep async if is going to be punted */ |
| 918 | unsigned needs_async_setup : 1; |
Jens Axboe | 27926b6 | 2020-10-28 09:33:23 -0600 | [diff] [blame] | 919 | /* should block plug */ |
| 920 | unsigned plug : 1; |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 921 | /* skip auditing */ |
| 922 | unsigned audit_skip : 1; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 923 | /* size of async data needed, if any */ |
| 924 | unsigned short async_size; |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 925 | }; |
| 926 | |
Jens Axboe | 0918682 | 2020-10-13 15:01:40 -0600 | [diff] [blame] | 927 | static const struct io_op_def io_op_defs[] = { |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 928 | [IORING_OP_NOP] = {}, |
| 929 | [IORING_OP_READV] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 930 | .needs_file = 1, |
| 931 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 932 | .pollin = 1, |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 933 | .buffer_select = 1, |
Pavel Begunkov | 26f0505 | 2021-02-28 22:35:18 +0000 | [diff] [blame] | 934 | .needs_async_setup = 1, |
Jens Axboe | 27926b6 | 2020-10-28 09:33:23 -0600 | [diff] [blame] | 935 | .plug = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 936 | .audit_skip = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 937 | .async_size = sizeof(struct io_async_rw), |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 938 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 939 | [IORING_OP_WRITEV] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 940 | .needs_file = 1, |
| 941 | .hash_reg_file = 1, |
| 942 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 943 | .pollout = 1, |
Pavel Begunkov | 26f0505 | 2021-02-28 22:35:18 +0000 | [diff] [blame] | 944 | .needs_async_setup = 1, |
Jens Axboe | 27926b6 | 2020-10-28 09:33:23 -0600 | [diff] [blame] | 945 | .plug = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 946 | .audit_skip = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 947 | .async_size = sizeof(struct io_async_rw), |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 948 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 949 | [IORING_OP_FSYNC] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 950 | .needs_file = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 951 | .audit_skip = 1, |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 952 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 953 | [IORING_OP_READ_FIXED] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 954 | .needs_file = 1, |
| 955 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 956 | .pollin = 1, |
Jens Axboe | 27926b6 | 2020-10-28 09:33:23 -0600 | [diff] [blame] | 957 | .plug = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 958 | .audit_skip = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 959 | .async_size = sizeof(struct io_async_rw), |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 960 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 961 | [IORING_OP_WRITE_FIXED] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 962 | .needs_file = 1, |
| 963 | .hash_reg_file = 1, |
| 964 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 965 | .pollout = 1, |
Jens Axboe | 27926b6 | 2020-10-28 09:33:23 -0600 | [diff] [blame] | 966 | .plug = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 967 | .audit_skip = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 968 | .async_size = sizeof(struct io_async_rw), |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 969 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 970 | [IORING_OP_POLL_ADD] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 971 | .needs_file = 1, |
| 972 | .unbound_nonreg_file = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 973 | .audit_skip = 1, |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 974 | }, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 975 | [IORING_OP_POLL_REMOVE] = { |
| 976 | .audit_skip = 1, |
| 977 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 978 | [IORING_OP_SYNC_FILE_RANGE] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 979 | .needs_file = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 980 | .audit_skip = 1, |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 981 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 982 | [IORING_OP_SENDMSG] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 983 | .needs_file = 1, |
| 984 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 985 | .pollout = 1, |
Pavel Begunkov | 26f0505 | 2021-02-28 22:35:18 +0000 | [diff] [blame] | 986 | .needs_async_setup = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 987 | .async_size = sizeof(struct io_async_msghdr), |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 988 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 989 | [IORING_OP_RECVMSG] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 990 | .needs_file = 1, |
| 991 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 992 | .pollin = 1, |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 993 | .buffer_select = 1, |
Pavel Begunkov | 26f0505 | 2021-02-28 22:35:18 +0000 | [diff] [blame] | 994 | .needs_async_setup = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 995 | .async_size = sizeof(struct io_async_msghdr), |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 996 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 997 | [IORING_OP_TIMEOUT] = { |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 998 | .audit_skip = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 999 | .async_size = sizeof(struct io_timeout_data), |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1000 | }, |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 1001 | [IORING_OP_TIMEOUT_REMOVE] = { |
| 1002 | /* used by timeout updates' prep() */ |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1003 | .audit_skip = 1, |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 1004 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 1005 | [IORING_OP_ACCEPT] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1006 | .needs_file = 1, |
| 1007 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 1008 | .pollin = 1, |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1009 | }, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1010 | [IORING_OP_ASYNC_CANCEL] = { |
| 1011 | .audit_skip = 1, |
| 1012 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 1013 | [IORING_OP_LINK_TIMEOUT] = { |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1014 | .audit_skip = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 1015 | .async_size = sizeof(struct io_timeout_data), |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1016 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 1017 | [IORING_OP_CONNECT] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1018 | .needs_file = 1, |
| 1019 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 1020 | .pollout = 1, |
Pavel Begunkov | 26f0505 | 2021-02-28 22:35:18 +0000 | [diff] [blame] | 1021 | .needs_async_setup = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 1022 | .async_size = sizeof(struct io_async_connect), |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1023 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 1024 | [IORING_OP_FALLOCATE] = { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1025 | .needs_file = 1, |
| 1026 | }, |
Jens Axboe | 44526be | 2021-02-15 13:32:18 -0700 | [diff] [blame] | 1027 | [IORING_OP_OPENAT] = {}, |
| 1028 | [IORING_OP_CLOSE] = {}, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1029 | [IORING_OP_FILES_UPDATE] = { |
| 1030 | .audit_skip = 1, |
| 1031 | }, |
| 1032 | [IORING_OP_STATX] = { |
| 1033 | .audit_skip = 1, |
| 1034 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 1035 | [IORING_OP_READ] = { |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 1036 | .needs_file = 1, |
| 1037 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 1038 | .pollin = 1, |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 1039 | .buffer_select = 1, |
Jens Axboe | 27926b6 | 2020-10-28 09:33:23 -0600 | [diff] [blame] | 1040 | .plug = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1041 | .audit_skip = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 1042 | .async_size = sizeof(struct io_async_rw), |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 1043 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 1044 | [IORING_OP_WRITE] = { |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 1045 | .needs_file = 1, |
Jens Axboe | 7b3188e | 2021-08-30 19:37:41 -0600 | [diff] [blame] | 1046 | .hash_reg_file = 1, |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 1047 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 1048 | .pollout = 1, |
Jens Axboe | 27926b6 | 2020-10-28 09:33:23 -0600 | [diff] [blame] | 1049 | .plug = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1050 | .audit_skip = 1, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 1051 | .async_size = sizeof(struct io_async_rw), |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 1052 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 1053 | [IORING_OP_FADVISE] = { |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 1054 | .needs_file = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1055 | .audit_skip = 1, |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 1056 | }, |
Jens Axboe | 44526be | 2021-02-15 13:32:18 -0700 | [diff] [blame] | 1057 | [IORING_OP_MADVISE] = {}, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 1058 | [IORING_OP_SEND] = { |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 1059 | .needs_file = 1, |
| 1060 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 1061 | .pollout = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1062 | .audit_skip = 1, |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 1063 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 1064 | [IORING_OP_RECV] = { |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 1065 | .needs_file = 1, |
| 1066 | .unbound_nonreg_file = 1, |
Jens Axboe | 8a72758 | 2020-02-20 09:59:44 -0700 | [diff] [blame] | 1067 | .pollin = 1, |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 1068 | .buffer_select = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1069 | .audit_skip = 1, |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 1070 | }, |
Pavel Begunkov | 0463b6c | 2020-01-18 21:35:38 +0300 | [diff] [blame] | 1071 | [IORING_OP_OPENAT2] = { |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 1072 | }, |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 1073 | [IORING_OP_EPOLL_CTL] = { |
| 1074 | .unbound_nonreg_file = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1075 | .audit_skip = 1, |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 1076 | }, |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 1077 | [IORING_OP_SPLICE] = { |
| 1078 | .needs_file = 1, |
| 1079 | .hash_reg_file = 1, |
| 1080 | .unbound_nonreg_file = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1081 | .audit_skip = 1, |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 1082 | }, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1083 | [IORING_OP_PROVIDE_BUFFERS] = { |
| 1084 | .audit_skip = 1, |
| 1085 | }, |
| 1086 | [IORING_OP_REMOVE_BUFFERS] = { |
| 1087 | .audit_skip = 1, |
| 1088 | }, |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 1089 | [IORING_OP_TEE] = { |
| 1090 | .needs_file = 1, |
| 1091 | .hash_reg_file = 1, |
| 1092 | .unbound_nonreg_file = 1, |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 1093 | .audit_skip = 1, |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 1094 | }, |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 1095 | [IORING_OP_SHUTDOWN] = { |
| 1096 | .needs_file = 1, |
| 1097 | }, |
Jens Axboe | 44526be | 2021-02-15 13:32:18 -0700 | [diff] [blame] | 1098 | [IORING_OP_RENAMEAT] = {}, |
| 1099 | [IORING_OP_UNLINKAT] = {}, |
Dmitry Kadashev | e34a02d | 2021-07-08 13:34:45 +0700 | [diff] [blame] | 1100 | [IORING_OP_MKDIRAT] = {}, |
Dmitry Kadashev | 7a8721f | 2021-07-08 13:34:46 +0700 | [diff] [blame] | 1101 | [IORING_OP_SYMLINKAT] = {}, |
Dmitry Kadashev | cf30da9 | 2021-07-08 13:34:47 +0700 | [diff] [blame] | 1102 | [IORING_OP_LINKAT] = {}, |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1103 | }; |
| 1104 | |
Pavel Begunkov | 0756a86 | 2021-08-15 10:40:25 +0100 | [diff] [blame] | 1105 | /* requests with any of those set should undergo io_disarm_next() */ |
| 1106 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) |
| 1107 | |
Pavel Begunkov | 7a61235 | 2021-03-09 00:37:59 +0000 | [diff] [blame] | 1108 | static bool io_disarm_next(struct io_kiocb *req); |
Pavel Begunkov | eef51da | 2021-06-14 02:36:15 +0100 | [diff] [blame] | 1109 | static void io_uring_del_tctx_node(unsigned long index); |
Pavel Begunkov | 9936c7c | 2021-02-04 13:51:56 +0000 | [diff] [blame] | 1110 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
| 1111 | struct task_struct *task, |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 1112 | bool cancel_all); |
Pavel Begunkov | 78cc687 | 2021-06-14 02:36:23 +0100 | [diff] [blame] | 1113 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
Pavel Begunkov | 1ffc542 | 2020-12-30 21:34:15 +0000 | [diff] [blame] | 1114 | |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1115 | static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
| 1116 | long res, unsigned int cflags); |
Jackie Liu | ec9c02a | 2019-11-08 23:50:36 +0800 | [diff] [blame] | 1117 | static void io_put_req(struct io_kiocb *req); |
Pavel Begunkov | 91c2f69 | 2021-08-11 19:28:28 +0100 | [diff] [blame] | 1118 | static void io_put_req_deferred(struct io_kiocb *req); |
Jens Axboe | c7dae4b | 2021-02-09 19:53:37 -0700 | [diff] [blame] | 1119 | static void io_dismantle_req(struct io_kiocb *req); |
Jens Axboe | 94ae5e7 | 2019-11-14 19:39:52 -0700 | [diff] [blame] | 1120 | static void io_queue_linked_timeout(struct io_kiocb *req); |
Pavel Begunkov | fdecb66 | 2021-04-25 14:32:20 +0100 | [diff] [blame] | 1121 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 1122 | struct io_uring_rsrc_update2 *up, |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 1123 | unsigned nr_args); |
Pavel Begunkov | 68fb897 | 2021-03-19 17:22:41 +0000 | [diff] [blame] | 1124 | static void io_clean_op(struct io_kiocb *req); |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 1125 | static struct file *io_file_get(struct io_ring_ctx *ctx, |
Pavel Begunkov | 8371adf | 2020-10-10 18:34:08 +0100 | [diff] [blame] | 1126 | struct io_kiocb *req, int fd, bool fixed); |
Pavel Begunkov | c5eef2b94 | 2021-02-10 00:03:22 +0000 | [diff] [blame] | 1127 | static void __io_queue_sqe(struct io_kiocb *req); |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 1128 | static void io_rsrc_put_work(struct work_struct *work); |
Jens Axboe | de0617e | 2019-04-06 21:51:27 -0600 | [diff] [blame] | 1129 | |
Pavel Begunkov | 907d1df | 2021-01-26 23:35:10 +0000 | [diff] [blame] | 1130 | static void io_req_task_queue(struct io_kiocb *req); |
Pavel Begunkov | 2a2758f | 2021-06-17 18:14:00 +0100 | [diff] [blame] | 1131 | static void io_submit_flush_completions(struct io_ring_ctx *ctx); |
Pavel Begunkov | 179ae0d | 2021-02-28 22:35:20 +0000 | [diff] [blame] | 1132 | static int io_req_prep_async(struct io_kiocb *req); |
Jens Axboe | 9a56a23 | 2019-01-09 09:06:50 -0700 | [diff] [blame] | 1133 | |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 1134 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
| 1135 | unsigned int issue_flags, u32 slot_index); |
Pavel Begunkov | f1042b6 | 2021-08-28 19:54:39 -0600 | [diff] [blame] | 1136 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 1137 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1138 | static struct kmem_cache *req_cachep; |
| 1139 | |
Jens Axboe | 0918682 | 2020-10-13 15:01:40 -0600 | [diff] [blame] | 1140 | static const struct file_operations io_uring_fops; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1141 | |
| 1142 | struct sock *io_uring_get_socket(struct file *file) |
| 1143 | { |
| 1144 | #if defined(CONFIG_UNIX) |
| 1145 | if (file->f_op == &io_uring_fops) { |
| 1146 | struct io_ring_ctx *ctx = file->private_data; |
| 1147 | |
| 1148 | return ctx->ring_sock->sk; |
| 1149 | } |
| 1150 | #endif |
| 1151 | return NULL; |
| 1152 | } |
| 1153 | EXPORT_SYMBOL(io_uring_get_socket); |
| 1154 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 1155 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
| 1156 | { |
| 1157 | if (!*locked) { |
| 1158 | mutex_lock(&ctx->uring_lock); |
| 1159 | *locked = true; |
| 1160 | } |
| 1161 | } |
| 1162 | |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 1163 | #define io_for_each_link(pos, head) \ |
| 1164 | for (pos = (head); pos; pos = pos->link) |
| 1165 | |
Pavel Begunkov | 21c843d | 2021-08-11 19:28:27 +0100 | [diff] [blame] | 1166 | /* |
| 1167 | * Shamelessly stolen from the mm implementation of page reference checking, |
| 1168 | * see commit f958d7b528b1 for details. |
| 1169 | */ |
| 1170 | #define req_ref_zero_or_close_to_overflow(req) \ |
| 1171 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) |
| 1172 | |
| 1173 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) |
| 1174 | { |
Pavel Begunkov | 20e60a3 | 2021-08-11 19:28:30 +0100 | [diff] [blame] | 1175 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
Pavel Begunkov | 21c843d | 2021-08-11 19:28:27 +0100 | [diff] [blame] | 1176 | return atomic_inc_not_zero(&req->refs); |
| 1177 | } |
| 1178 | |
Pavel Begunkov | 21c843d | 2021-08-11 19:28:27 +0100 | [diff] [blame] | 1179 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
| 1180 | { |
Pavel Begunkov | 20e60a3 | 2021-08-11 19:28:30 +0100 | [diff] [blame] | 1181 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
| 1182 | return true; |
| 1183 | |
Pavel Begunkov | 21c843d | 2021-08-11 19:28:27 +0100 | [diff] [blame] | 1184 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
| 1185 | return atomic_dec_and_test(&req->refs); |
| 1186 | } |
| 1187 | |
| 1188 | static inline void req_ref_put(struct io_kiocb *req) |
| 1189 | { |
Pavel Begunkov | 20e60a3 | 2021-08-11 19:28:30 +0100 | [diff] [blame] | 1190 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
Pavel Begunkov | 21c843d | 2021-08-11 19:28:27 +0100 | [diff] [blame] | 1191 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
| 1192 | } |
| 1193 | |
| 1194 | static inline void req_ref_get(struct io_kiocb *req) |
| 1195 | { |
Pavel Begunkov | 20e60a3 | 2021-08-11 19:28:30 +0100 | [diff] [blame] | 1196 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
Pavel Begunkov | 21c843d | 2021-08-11 19:28:27 +0100 | [diff] [blame] | 1197 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
| 1198 | atomic_inc(&req->refs); |
| 1199 | } |
| 1200 | |
Pavel Begunkov | 48dcd38 | 2021-08-15 10:40:18 +0100 | [diff] [blame] | 1201 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
Pavel Begunkov | 20e60a3 | 2021-08-11 19:28:30 +0100 | [diff] [blame] | 1202 | { |
| 1203 | if (!(req->flags & REQ_F_REFCOUNT)) { |
| 1204 | req->flags |= REQ_F_REFCOUNT; |
Pavel Begunkov | 48dcd38 | 2021-08-15 10:40:18 +0100 | [diff] [blame] | 1205 | atomic_set(&req->refs, nr); |
Pavel Begunkov | 20e60a3 | 2021-08-11 19:28:30 +0100 | [diff] [blame] | 1206 | } |
| 1207 | } |
| 1208 | |
Pavel Begunkov | 48dcd38 | 2021-08-15 10:40:18 +0100 | [diff] [blame] | 1209 | static inline void io_req_set_refcount(struct io_kiocb *req) |
| 1210 | { |
| 1211 | __io_req_set_refcount(req, 1); |
| 1212 | } |
| 1213 | |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 1214 | static inline void io_req_set_rsrc_node(struct io_kiocb *req) |
Jens Axboe | c40f637 | 2020-06-25 15:39:59 -0600 | [diff] [blame] | 1215 | { |
Pavel Begunkov | 36f72fe | 2020-11-18 19:57:26 +0000 | [diff] [blame] | 1216 | struct io_ring_ctx *ctx = req->ctx; |
| 1217 | |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 1218 | if (!req->fixed_rsrc_refs) { |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 1219 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 1220 | percpu_ref_get(req->fixed_rsrc_refs); |
Pavel Begunkov | 36f72fe | 2020-11-18 19:57:26 +0000 | [diff] [blame] | 1221 | } |
| 1222 | } |
| 1223 | |
Pavel Begunkov | f70865d | 2021-04-11 01:46:40 +0100 | [diff] [blame] | 1224 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
| 1225 | { |
| 1226 | bool got = percpu_ref_tryget(ref); |
| 1227 | |
| 1228 | /* already at zero, wait for ->release() */ |
| 1229 | if (!got) |
| 1230 | wait_for_completion(compl); |
| 1231 | percpu_ref_resurrect(ref); |
| 1232 | if (got) |
| 1233 | percpu_ref_put(ref); |
| 1234 | } |
| 1235 | |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 1236 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
| 1237 | bool cancel_all) |
Pavel Begunkov | 08d2363 | 2020-11-06 13:00:22 +0000 | [diff] [blame] | 1238 | { |
| 1239 | struct io_kiocb *req; |
| 1240 | |
Pavel Begunkov | 6820768 | 2021-03-22 01:58:25 +0000 | [diff] [blame] | 1241 | if (task && head->task != task) |
Pavel Begunkov | 08d2363 | 2020-11-06 13:00:22 +0000 | [diff] [blame] | 1242 | return false; |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 1243 | if (cancel_all) |
Pavel Begunkov | 08d2363 | 2020-11-06 13:00:22 +0000 | [diff] [blame] | 1244 | return true; |
| 1245 | |
| 1246 | io_for_each_link(req, head) { |
Pavel Begunkov | b05a1bc | 2021-03-04 13:59:24 +0000 | [diff] [blame] | 1247 | if (req->flags & REQ_F_INFLIGHT) |
Jens Axboe | 02a1367 | 2021-01-23 15:49:31 -0700 | [diff] [blame] | 1248 | return true; |
Pavel Begunkov | 08d2363 | 2020-11-06 13:00:22 +0000 | [diff] [blame] | 1249 | } |
| 1250 | return false; |
| 1251 | } |
| 1252 | |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 1253 | static inline void req_set_fail(struct io_kiocb *req) |
Jens Axboe | c40f637 | 2020-06-25 15:39:59 -0600 | [diff] [blame] | 1254 | { |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 1255 | req->flags |= REQ_F_FAIL; |
Jens Axboe | c40f637 | 2020-06-25 15:39:59 -0600 | [diff] [blame] | 1256 | } |
Jens Axboe | 4a38aed2 | 2020-05-14 17:21:15 -0600 | [diff] [blame] | 1257 | |
Hao Xu | a8295b9 | 2021-08-27 17:46:09 +0800 | [diff] [blame] | 1258 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
| 1259 | { |
| 1260 | req_set_fail(req); |
| 1261 | req->result = res; |
| 1262 | } |
| 1263 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1264 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
| 1265 | { |
| 1266 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); |
| 1267 | |
Jens Axboe | 0f158b4 | 2020-05-14 17:18:39 -0600 | [diff] [blame] | 1268 | complete(&ctx->ref_comp); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1269 | } |
| 1270 | |
Pavel Begunkov | 8eb7e2d | 2020-06-29 13:13:02 +0300 | [diff] [blame] | 1271 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
| 1272 | { |
| 1273 | return !req->timeout.off; |
| 1274 | } |
| 1275 | |
Pavel Begunkov | f56165e | 2021-08-09 20:18:07 +0100 | [diff] [blame] | 1276 | static void io_fallback_req_func(struct work_struct *work) |
| 1277 | { |
| 1278 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
| 1279 | fallback_work.work); |
| 1280 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); |
| 1281 | struct io_kiocb *req, *tmp; |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 1282 | bool locked = false; |
Pavel Begunkov | f56165e | 2021-08-09 20:18:07 +0100 | [diff] [blame] | 1283 | |
| 1284 | percpu_ref_get(&ctx->refs); |
| 1285 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 1286 | req->io_task_work.func(req, &locked); |
Pavel Begunkov | 5636c00 | 2021-08-18 12:42:45 +0100 | [diff] [blame] | 1287 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 1288 | if (locked) { |
| 1289 | if (ctx->submit_state.compl_nr) |
| 1290 | io_submit_flush_completions(ctx); |
| 1291 | mutex_unlock(&ctx->uring_lock); |
| 1292 | } |
Pavel Begunkov | f56165e | 2021-08-09 20:18:07 +0100 | [diff] [blame] | 1293 | percpu_ref_put(&ctx->refs); |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 1294 | |
Pavel Begunkov | f56165e | 2021-08-09 20:18:07 +0100 | [diff] [blame] | 1295 | } |
| 1296 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1297 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
| 1298 | { |
| 1299 | struct io_ring_ctx *ctx; |
Jens Axboe | 78076bb | 2019-12-04 19:56:40 -0700 | [diff] [blame] | 1300 | int hash_bits; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1301 | |
| 1302 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
| 1303 | if (!ctx) |
| 1304 | return NULL; |
| 1305 | |
Jens Axboe | 78076bb | 2019-12-04 19:56:40 -0700 | [diff] [blame] | 1306 | /* |
| 1307 | * Use 5 bits less than the max cq entries, that should give us around |
| 1308 | * 32 entries per hash list if totally full and uniformly spread. |
| 1309 | */ |
| 1310 | hash_bits = ilog2(p->cq_entries); |
| 1311 | hash_bits -= 5; |
| 1312 | if (hash_bits <= 0) |
| 1313 | hash_bits = 1; |
| 1314 | ctx->cancel_hash_bits = hash_bits; |
| 1315 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), |
| 1316 | GFP_KERNEL); |
| 1317 | if (!ctx->cancel_hash) |
| 1318 | goto err; |
| 1319 | __hash_init(ctx->cancel_hash, 1U << hash_bits); |
| 1320 | |
Pavel Begunkov | 6224843 | 2021-04-28 13:11:29 +0100 | [diff] [blame] | 1321 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
| 1322 | if (!ctx->dummy_ubuf) |
| 1323 | goto err; |
| 1324 | /* set invalid range, so io_import_fixed() fails meeting it */ |
| 1325 | ctx->dummy_ubuf->ubuf = -1UL; |
| 1326 | |
Roman Gushchin | 2148289 | 2019-05-07 10:01:48 -0700 | [diff] [blame] | 1327 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
Jens Axboe | 206aefd | 2019-11-07 18:27:42 -0700 | [diff] [blame] | 1328 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
| 1329 | goto err; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1330 | |
| 1331 | ctx->flags = p->flags; |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 1332 | init_waitqueue_head(&ctx->sqo_sq_wait); |
Jens Axboe | 69fb213 | 2020-09-14 11:16:23 -0600 | [diff] [blame] | 1333 | INIT_LIST_HEAD(&ctx->sqd_list); |
Pavel Begunkov | 311997b | 2021-06-14 23:37:28 +0100 | [diff] [blame] | 1334 | init_waitqueue_head(&ctx->poll_wait); |
Jens Axboe | 1d7bb1d | 2019-11-06 11:31:17 -0700 | [diff] [blame] | 1335 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
Jens Axboe | 0f158b4 | 2020-05-14 17:18:39 -0600 | [diff] [blame] | 1336 | init_completion(&ctx->ref_comp); |
Jens Axboe | 9e15c3a | 2021-03-13 12:29:43 -0700 | [diff] [blame] | 1337 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
Matthew Wilcox (Oracle) | 61cf937 | 2021-03-08 14:16:16 +0000 | [diff] [blame] | 1338 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1339 | mutex_init(&ctx->uring_lock); |
Pavel Begunkov | 311997b | 2021-06-14 23:37:28 +0100 | [diff] [blame] | 1340 | init_waitqueue_head(&ctx->cq_wait); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1341 | spin_lock_init(&ctx->completion_lock); |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 1342 | spin_lock_init(&ctx->timeout_lock); |
Pavel Begunkov | 540e32a | 2020-07-13 23:37:09 +0300 | [diff] [blame] | 1343 | INIT_LIST_HEAD(&ctx->iopoll_list); |
Jens Axboe | de0617e | 2019-04-06 21:51:27 -0600 | [diff] [blame] | 1344 | INIT_LIST_HEAD(&ctx->defer_list); |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 1345 | INIT_LIST_HEAD(&ctx->timeout_list); |
Pavel Begunkov | ef9dd63 | 2021-08-28 19:54:38 -0600 | [diff] [blame] | 1346 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
Bijan Mottahedeh | d67d226 | 2021-01-15 17:37:46 +0000 | [diff] [blame] | 1347 | spin_lock_init(&ctx->rsrc_ref_lock); |
| 1348 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 1349 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
| 1350 | init_llist_head(&ctx->rsrc_put_llist); |
Pavel Begunkov | 13bf43f | 2021-03-06 11:02:12 +0000 | [diff] [blame] | 1351 | INIT_LIST_HEAD(&ctx->tctx_list); |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 1352 | INIT_LIST_HEAD(&ctx->submit_state.free_list); |
Pavel Begunkov | d0acdee | 2021-05-16 22:58:12 +0100 | [diff] [blame] | 1353 | INIT_LIST_HEAD(&ctx->locked_free_list); |
Pavel Begunkov | 9011bf9 | 2021-06-30 21:54:03 +0100 | [diff] [blame] | 1354 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1355 | return ctx; |
Jens Axboe | 206aefd | 2019-11-07 18:27:42 -0700 | [diff] [blame] | 1356 | err: |
Pavel Begunkov | 6224843 | 2021-04-28 13:11:29 +0100 | [diff] [blame] | 1357 | kfree(ctx->dummy_ubuf); |
Jens Axboe | 78076bb | 2019-12-04 19:56:40 -0700 | [diff] [blame] | 1358 | kfree(ctx->cancel_hash); |
Jens Axboe | 206aefd | 2019-11-07 18:27:42 -0700 | [diff] [blame] | 1359 | kfree(ctx); |
| 1360 | return NULL; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1361 | } |
| 1362 | |
Pavel Begunkov | 8f6ed49 | 2021-05-16 22:58:10 +0100 | [diff] [blame] | 1363 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
| 1364 | { |
| 1365 | struct io_rings *r = ctx->rings; |
| 1366 | |
| 1367 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); |
| 1368 | ctx->cq_extra--; |
| 1369 | } |
| 1370 | |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 1371 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
Jens Axboe | de0617e | 2019-04-06 21:51:27 -0600 | [diff] [blame] | 1372 | { |
Jens Axboe | 2bc9930 | 2020-07-09 09:43:27 -0600 | [diff] [blame] | 1373 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
| 1374 | struct io_ring_ctx *ctx = req->ctx; |
Jackie Liu | a197f66 | 2019-11-08 08:09:12 -0700 | [diff] [blame] | 1375 | |
Pavel Begunkov | 8f6ed49 | 2021-05-16 22:58:10 +0100 | [diff] [blame] | 1376 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
Jens Axboe | 2bc9930 | 2020-07-09 09:43:27 -0600 | [diff] [blame] | 1377 | } |
Jens Axboe | 7adf4ea | 2019-10-10 21:42:58 -0600 | [diff] [blame] | 1378 | |
Bob Liu | 9d858b2 | 2019-11-13 18:06:25 +0800 | [diff] [blame] | 1379 | return false; |
Jens Axboe | 7adf4ea | 2019-10-10 21:42:58 -0600 | [diff] [blame] | 1380 | } |
| 1381 | |
Pavel Begunkov | c97d8a0 | 2021-08-09 13:04:04 +0100 | [diff] [blame] | 1382 | #define FFS_ASYNC_READ 0x1UL |
| 1383 | #define FFS_ASYNC_WRITE 0x2UL |
| 1384 | #ifdef CONFIG_64BIT |
| 1385 | #define FFS_ISREG 0x4UL |
| 1386 | #else |
| 1387 | #define FFS_ISREG 0x0UL |
| 1388 | #endif |
| 1389 | #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) |
| 1390 | |
| 1391 | static inline bool io_req_ffs_set(struct io_kiocb *req) |
| 1392 | { |
| 1393 | return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE); |
| 1394 | } |
| 1395 | |
Pavel Begunkov | ce3d5aa | 2021-02-01 18:59:55 +0000 | [diff] [blame] | 1396 | static void io_req_track_inflight(struct io_kiocb *req) |
| 1397 | { |
Pavel Begunkov | ce3d5aa | 2021-02-01 18:59:55 +0000 | [diff] [blame] | 1398 | if (!(req->flags & REQ_F_INFLIGHT)) { |
Pavel Begunkov | ce3d5aa | 2021-02-01 18:59:55 +0000 | [diff] [blame] | 1399 | req->flags |= REQ_F_INFLIGHT; |
Pavel Begunkov | b303fe2 | 2021-04-11 01:46:26 +0100 | [diff] [blame] | 1400 | atomic_inc(¤t->io_uring->inflight_tracked); |
Pavel Begunkov | ce3d5aa | 2021-02-01 18:59:55 +0000 | [diff] [blame] | 1401 | } |
| 1402 | } |
| 1403 | |
Pavel Begunkov | 906c6ca | 2021-08-15 10:40:26 +0100 | [diff] [blame] | 1404 | static inline void io_unprep_linked_timeout(struct io_kiocb *req) |
| 1405 | { |
| 1406 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
| 1407 | } |
| 1408 | |
Pavel Begunkov | fd08e53 | 2021-08-11 19:28:31 +0100 | [diff] [blame] | 1409 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
| 1410 | { |
Pavel Begunkov | 906c6ca | 2021-08-15 10:40:26 +0100 | [diff] [blame] | 1411 | if (WARN_ON_ONCE(!req->link)) |
| 1412 | return NULL; |
| 1413 | |
Pavel Begunkov | 4d13d1a | 2021-08-15 10:40:24 +0100 | [diff] [blame] | 1414 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
| 1415 | req->flags |= REQ_F_LINK_TIMEOUT; |
Pavel Begunkov | fd08e53 | 2021-08-11 19:28:31 +0100 | [diff] [blame] | 1416 | |
| 1417 | /* linked timeouts should have two refs once prep'ed */ |
Pavel Begunkov | 48dcd38 | 2021-08-15 10:40:18 +0100 | [diff] [blame] | 1418 | io_req_set_refcount(req); |
Pavel Begunkov | 4d13d1a | 2021-08-15 10:40:24 +0100 | [diff] [blame] | 1419 | __io_req_set_refcount(req->link, 2); |
| 1420 | return req->link; |
Pavel Begunkov | fd08e53 | 2021-08-11 19:28:31 +0100 | [diff] [blame] | 1421 | } |
| 1422 | |
| 1423 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
| 1424 | { |
Pavel Begunkov | 4d13d1a | 2021-08-15 10:40:24 +0100 | [diff] [blame] | 1425 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
Pavel Begunkov | fd08e53 | 2021-08-11 19:28:31 +0100 | [diff] [blame] | 1426 | return NULL; |
| 1427 | return __io_prep_linked_timeout(req); |
| 1428 | } |
| 1429 | |
Pavel Begunkov | cbdcb43 | 2020-06-29 19:18:43 +0300 | [diff] [blame] | 1430 | static void io_prep_async_work(struct io_kiocb *req) |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 1431 | { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1432 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
Pavel Begunkov | 2332951 | 2020-10-10 18:34:06 +0100 | [diff] [blame] | 1433 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 54a91f3 | 2019-09-10 09:15:04 -0600 | [diff] [blame] | 1434 | |
Pavel Begunkov | b8e64b5 | 2021-06-17 18:14:02 +0100 | [diff] [blame] | 1435 | if (!(req->flags & REQ_F_CREDS)) { |
| 1436 | req->flags |= REQ_F_CREDS; |
Pavel Begunkov | c10d1f9 | 2021-06-17 18:14:01 +0100 | [diff] [blame] | 1437 | req->creds = get_current_cred(); |
Pavel Begunkov | b8e64b5 | 2021-06-17 18:14:02 +0100 | [diff] [blame] | 1438 | } |
Jens Axboe | 003e8dc | 2021-03-06 09:22:27 -0700 | [diff] [blame] | 1439 | |
Pavel Begunkov | e1d675d | 2021-03-22 01:58:29 +0000 | [diff] [blame] | 1440 | req->work.list.next = NULL; |
| 1441 | req->work.flags = 0; |
Pavel Begunkov | feaadc4 | 2020-10-22 16:47:16 +0100 | [diff] [blame] | 1442 | if (req->flags & REQ_F_FORCE_ASYNC) |
| 1443 | req->work.flags |= IO_WQ_WORK_CONCURRENT; |
| 1444 | |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1445 | if (req->flags & REQ_F_ISREG) { |
Pavel Begunkov | 2332951 | 2020-10-10 18:34:06 +0100 | [diff] [blame] | 1446 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) |
Pavel Begunkov | 8766dd5 | 2020-03-14 00:31:04 +0300 | [diff] [blame] | 1447 | io_wq_hash_work(&req->work, file_inode(req->file)); |
Jens Axboe | 4b982bd | 2021-04-01 08:38:34 -0600 | [diff] [blame] | 1448 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 1449 | if (def->unbound_nonreg_file) |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 1450 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
Jens Axboe | 54a91f3 | 2019-09-10 09:15:04 -0600 | [diff] [blame] | 1451 | } |
Pavel Begunkov | e1d675d | 2021-03-22 01:58:29 +0000 | [diff] [blame] | 1452 | |
| 1453 | switch (req->opcode) { |
| 1454 | case IORING_OP_SPLICE: |
| 1455 | case IORING_OP_TEE: |
Pavel Begunkov | e1d675d | 2021-03-22 01:58:29 +0000 | [diff] [blame] | 1456 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
| 1457 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
| 1458 | break; |
| 1459 | } |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 1460 | } |
| 1461 | |
Pavel Begunkov | cbdcb43 | 2020-06-29 19:18:43 +0300 | [diff] [blame] | 1462 | static void io_prep_async_link(struct io_kiocb *req) |
| 1463 | { |
| 1464 | struct io_kiocb *cur; |
| 1465 | |
Pavel Begunkov | 44eff40 | 2021-07-26 14:14:31 +0100 | [diff] [blame] | 1466 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
| 1467 | struct io_ring_ctx *ctx = req->ctx; |
| 1468 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 1469 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | 44eff40 | 2021-07-26 14:14:31 +0100 | [diff] [blame] | 1470 | io_for_each_link(cur, req) |
| 1471 | io_prep_async_work(cur); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 1472 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | 44eff40 | 2021-07-26 14:14:31 +0100 | [diff] [blame] | 1473 | } else { |
| 1474 | io_for_each_link(cur, req) |
| 1475 | io_prep_async_work(cur); |
| 1476 | } |
Pavel Begunkov | cbdcb43 | 2020-06-29 19:18:43 +0300 | [diff] [blame] | 1477 | } |
| 1478 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 1479 | static void io_queue_async_work(struct io_kiocb *req, bool *locked) |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 1480 | { |
Jackie Liu | a197f66 | 2019-11-08 08:09:12 -0700 | [diff] [blame] | 1481 | struct io_ring_ctx *ctx = req->ctx; |
Pavel Begunkov | cbdcb43 | 2020-06-29 19:18:43 +0300 | [diff] [blame] | 1482 | struct io_kiocb *link = io_prep_linked_timeout(req); |
Jens Axboe | 5aa75ed | 2021-02-16 12:56:50 -0700 | [diff] [blame] | 1483 | struct io_uring_task *tctx = req->task->io_uring; |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 1484 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 1485 | /* must not take the lock, NULL it as a precaution */ |
| 1486 | locked = NULL; |
| 1487 | |
Jens Axboe | 3bfe610 | 2021-02-16 14:15:30 -0700 | [diff] [blame] | 1488 | BUG_ON(!tctx); |
| 1489 | BUG_ON(!tctx->io_wq); |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 1490 | |
Pavel Begunkov | cbdcb43 | 2020-06-29 19:18:43 +0300 | [diff] [blame] | 1491 | /* init ->work of the whole link before punting */ |
| 1492 | io_prep_async_link(req); |
Jens Axboe | 991468d | 2021-07-23 11:53:54 -0600 | [diff] [blame] | 1493 | |
| 1494 | /* |
| 1495 | * Not expected to happen, but if we do have a bug where this _can_ |
| 1496 | * happen, catch it here and ensure the request is marked as |
| 1497 | * canceled. That will make io-wq go through the usual work cancel |
| 1498 | * procedure rather than attempt to run this request (or create a new |
| 1499 | * worker for it). |
| 1500 | */ |
| 1501 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) |
| 1502 | req->work.flags |= IO_WQ_WORK_CANCEL; |
| 1503 | |
Pavel Begunkov | d07f1e8a | 2021-03-22 01:45:58 +0000 | [diff] [blame] | 1504 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
| 1505 | &req->work, req->flags); |
Pavel Begunkov | ebf9366 | 2021-03-01 18:20:47 +0000 | [diff] [blame] | 1506 | io_wq_enqueue(tctx->io_wq, &req->work); |
Jens Axboe | 7271ef3 | 2020-08-10 09:55:22 -0600 | [diff] [blame] | 1507 | if (link) |
| 1508 | io_queue_linked_timeout(link); |
Pavel Begunkov | cbdcb43 | 2020-06-29 19:18:43 +0300 | [diff] [blame] | 1509 | } |
| 1510 | |
Pavel Begunkov | 1ee4160 | 2021-03-25 18:32:42 +0000 | [diff] [blame] | 1511 | static void io_kill_timeout(struct io_kiocb *req, int status) |
Pavel Begunkov | 8c85588 | 2021-04-13 02:58:41 +0100 | [diff] [blame] | 1512 | __must_hold(&req->ctx->completion_lock) |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 1513 | __must_hold(&req->ctx->timeout_lock) |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 1514 | { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 1515 | struct io_timeout_data *io = req->async_data; |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 1516 | |
Pavel Begunkov | fd9c7bc | 2021-04-13 02:58:42 +0100 | [diff] [blame] | 1517 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
Pavel Begunkov | 2ae2eb9 | 2021-09-09 13:56:27 +0100 | [diff] [blame] | 1518 | if (status) |
| 1519 | req_set_fail(req); |
Pavel Begunkov | 01cec8c | 2020-07-30 18:43:50 +0300 | [diff] [blame] | 1520 | atomic_set(&req->ctx->cq_timeouts, |
| 1521 | atomic_read(&req->ctx->cq_timeouts) + 1); |
Pavel Begunkov | 135fcde | 2020-07-13 23:37:12 +0300 | [diff] [blame] | 1522 | list_del_init(&req->timeout.list); |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1523 | io_cqring_fill_event(req->ctx, req->user_data, status, 0); |
Pavel Begunkov | 91c2f69 | 2021-08-11 19:28:28 +0100 | [diff] [blame] | 1524 | io_put_req_deferred(req); |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 1525 | } |
| 1526 | } |
| 1527 | |
Pavel Begunkov | 441b8a7 | 2021-06-14 23:37:31 +0100 | [diff] [blame] | 1528 | static void io_queue_deferred(struct io_ring_ctx *ctx) |
Pavel Begunkov | 0451894 | 2020-05-26 20:34:05 +0300 | [diff] [blame] | 1529 | { |
Pavel Begunkov | 441b8a7 | 2021-06-14 23:37:31 +0100 | [diff] [blame] | 1530 | while (!list_empty(&ctx->defer_list)) { |
Pavel Begunkov | 27dc833 | 2020-07-13 23:37:14 +0300 | [diff] [blame] | 1531 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
| 1532 | struct io_defer_entry, list); |
Pavel Begunkov | 0451894 | 2020-05-26 20:34:05 +0300 | [diff] [blame] | 1533 | |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 1534 | if (req_need_defer(de->req, de->seq)) |
Pavel Begunkov | 0451894 | 2020-05-26 20:34:05 +0300 | [diff] [blame] | 1535 | break; |
Pavel Begunkov | 27dc833 | 2020-07-13 23:37:14 +0300 | [diff] [blame] | 1536 | list_del_init(&de->list); |
Pavel Begunkov | 907d1df | 2021-01-26 23:35:10 +0000 | [diff] [blame] | 1537 | io_req_task_queue(de->req); |
Pavel Begunkov | 27dc833 | 2020-07-13 23:37:14 +0300 | [diff] [blame] | 1538 | kfree(de); |
Pavel Begunkov | 441b8a7 | 2021-06-14 23:37:31 +0100 | [diff] [blame] | 1539 | } |
Pavel Begunkov | 0451894 | 2020-05-26 20:34:05 +0300 | [diff] [blame] | 1540 | } |
| 1541 | |
Pavel Begunkov | 360428f | 2020-05-30 14:54:17 +0300 | [diff] [blame] | 1542 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 1543 | __must_hold(&ctx->completion_lock) |
Pavel Begunkov | 360428f | 2020-05-30 14:54:17 +0300 | [diff] [blame] | 1544 | { |
Pavel Begunkov | 441b8a7 | 2021-06-14 23:37:31 +0100 | [diff] [blame] | 1545 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
Marcelo Diop-Gonzalez | f010505 | 2021-01-15 11:54:40 -0500 | [diff] [blame] | 1546 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 1547 | spin_lock_irq(&ctx->timeout_lock); |
Pavel Begunkov | f18ee4c | 2021-06-14 23:37:25 +0100 | [diff] [blame] | 1548 | while (!list_empty(&ctx->timeout_list)) { |
Marcelo Diop-Gonzalez | f010505 | 2021-01-15 11:54:40 -0500 | [diff] [blame] | 1549 | u32 events_needed, events_got; |
Pavel Begunkov | 360428f | 2020-05-30 14:54:17 +0300 | [diff] [blame] | 1550 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
Pavel Begunkov | 135fcde | 2020-07-13 23:37:12 +0300 | [diff] [blame] | 1551 | struct io_kiocb, timeout.list); |
Pavel Begunkov | 360428f | 2020-05-30 14:54:17 +0300 | [diff] [blame] | 1552 | |
Pavel Begunkov | 8eb7e2d | 2020-06-29 13:13:02 +0300 | [diff] [blame] | 1553 | if (io_is_timeout_noseq(req)) |
Pavel Begunkov | 360428f | 2020-05-30 14:54:17 +0300 | [diff] [blame] | 1554 | break; |
Marcelo Diop-Gonzalez | f010505 | 2021-01-15 11:54:40 -0500 | [diff] [blame] | 1555 | |
| 1556 | /* |
| 1557 | * Since seq can easily wrap around over time, subtract |
| 1558 | * the last seq at which timeouts were flushed before comparing. |
| 1559 | * Assuming not more than 2^31-1 events have happened since, |
| 1560 | * these subtractions won't have wrapped, so we can check if |
| 1561 | * target is in [last_seq, current_seq] by comparing the two. |
| 1562 | */ |
| 1563 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; |
| 1564 | events_got = seq - ctx->cq_last_tm_flush; |
| 1565 | if (events_got < events_needed) |
Pavel Begunkov | 360428f | 2020-05-30 14:54:17 +0300 | [diff] [blame] | 1566 | break; |
Pavel Begunkov | bfe68a2 | 2020-05-30 14:54:18 +0300 | [diff] [blame] | 1567 | |
Pavel Begunkov | 135fcde | 2020-07-13 23:37:12 +0300 | [diff] [blame] | 1568 | list_del_init(&req->timeout.list); |
Pavel Begunkov | 1ee4160 | 2021-03-25 18:32:42 +0000 | [diff] [blame] | 1569 | io_kill_timeout(req, 0); |
Pavel Begunkov | f18ee4c | 2021-06-14 23:37:25 +0100 | [diff] [blame] | 1570 | } |
Marcelo Diop-Gonzalez | f010505 | 2021-01-15 11:54:40 -0500 | [diff] [blame] | 1571 | ctx->cq_last_tm_flush = seq; |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 1572 | spin_unlock_irq(&ctx->timeout_lock); |
Pavel Begunkov | 360428f | 2020-05-30 14:54:17 +0300 | [diff] [blame] | 1573 | } |
| 1574 | |
Pavel Begunkov | 2335f6f | 2021-06-15 16:47:58 +0100 | [diff] [blame] | 1575 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
Jens Axboe | de0617e | 2019-04-06 21:51:27 -0600 | [diff] [blame] | 1576 | { |
Pavel Begunkov | 2335f6f | 2021-06-15 16:47:58 +0100 | [diff] [blame] | 1577 | if (ctx->off_timeout_used) |
| 1578 | io_flush_timeouts(ctx); |
| 1579 | if (ctx->drain_active) |
| 1580 | io_queue_deferred(ctx); |
| 1581 | } |
| 1582 | |
| 1583 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) |
| 1584 | { |
| 1585 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) |
| 1586 | __io_commit_cqring_flush(ctx); |
Pavel Begunkov | ec30e04 | 2021-01-19 13:32:38 +0000 | [diff] [blame] | 1587 | /* order cqe stores with ring update */ |
| 1588 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); |
Jens Axboe | de0617e | 2019-04-06 21:51:27 -0600 | [diff] [blame] | 1589 | } |
| 1590 | |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 1591 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
| 1592 | { |
| 1593 | struct io_rings *r = ctx->rings; |
| 1594 | |
Pavel Begunkov | a566c55 | 2021-05-16 22:58:08 +0100 | [diff] [blame] | 1595 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 1596 | } |
| 1597 | |
Pavel Begunkov | 888aae2 | 2021-01-19 13:32:39 +0000 | [diff] [blame] | 1598 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
| 1599 | { |
| 1600 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); |
| 1601 | } |
| 1602 | |
Pavel Begunkov | d068b50 | 2021-05-16 22:58:11 +0100 | [diff] [blame] | 1603 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1604 | { |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 1605 | struct io_rings *rings = ctx->rings; |
Pavel Begunkov | ea5ab3b | 2021-05-16 22:58:09 +0100 | [diff] [blame] | 1606 | unsigned tail, mask = ctx->cq_entries - 1; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1607 | |
Stefan Bühler | 115e12e | 2019-04-24 23:54:18 +0200 | [diff] [blame] | 1608 | /* |
| 1609 | * writes to the cq entry need to come after reading head; the |
| 1610 | * control dependency is enough as we're using WRITE_ONCE to |
| 1611 | * fill the cq entry |
| 1612 | */ |
Pavel Begunkov | a566c55 | 2021-05-16 22:58:08 +0100 | [diff] [blame] | 1613 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1614 | return NULL; |
| 1615 | |
Pavel Begunkov | 888aae2 | 2021-01-19 13:32:39 +0000 | [diff] [blame] | 1616 | tail = ctx->cached_cq_tail++; |
Pavel Begunkov | ea5ab3b | 2021-05-16 22:58:09 +0100 | [diff] [blame] | 1617 | return &rings->cqes[tail & mask]; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1618 | } |
| 1619 | |
Jens Axboe | f2842ab | 2020-01-08 11:04:00 -0700 | [diff] [blame] | 1620 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
| 1621 | { |
Pavel Begunkov | 44c769d | 2021-04-11 01:46:31 +0100 | [diff] [blame] | 1622 | if (likely(!ctx->cq_ev_fd)) |
Jens Axboe | f0b493e | 2020-02-01 21:30:11 -0700 | [diff] [blame] | 1623 | return false; |
Stefano Garzarella | 7e55a19 | 2020-05-15 18:38:05 +0200 | [diff] [blame] | 1624 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
| 1625 | return false; |
Pavel Begunkov | 44c769d | 2021-04-11 01:46:31 +0100 | [diff] [blame] | 1626 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
Jens Axboe | f2842ab | 2020-01-08 11:04:00 -0700 | [diff] [blame] | 1627 | } |
| 1628 | |
Jens Axboe | 2c5d763 | 2021-08-21 07:21:19 -0600 | [diff] [blame] | 1629 | /* |
| 1630 | * This should only get called when at least one event has been posted. |
| 1631 | * Some applications rely on the eventfd notification count only changing |
| 1632 | * IFF a new CQE has been added to the CQ ring. There's no depedency on |
| 1633 | * 1:1 relationship between how many times this function is called (and |
| 1634 | * hence the eventfd count) and number of CQEs posted to the CQ ring. |
| 1635 | */ |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 1636 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
Jens Axboe | 8c83878 | 2019-03-12 15:48:16 -0600 | [diff] [blame] | 1637 | { |
Jens Axboe | 5fd4617 | 2021-08-06 14:04:31 -0600 | [diff] [blame] | 1638 | /* |
| 1639 | * wake_up_all() may seem excessive, but io_wake_function() and |
| 1640 | * io_should_wake() handle the termination of the loop and only |
| 1641 | * wake as many waiters as we need to. |
| 1642 | */ |
| 1643 | if (wq_has_sleeper(&ctx->cq_wait)) |
| 1644 | wake_up_all(&ctx->cq_wait); |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 1645 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
| 1646 | wake_up(&ctx->sq_data->wait); |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 1647 | if (io_should_trigger_evfd(ctx)) |
Jens Axboe | 9b40284 | 2019-04-11 11:45:41 -0600 | [diff] [blame] | 1648 | eventfd_signal(ctx->cq_ev_fd, 1); |
Pavel Begunkov | 311997b | 2021-06-14 23:37:28 +0100 | [diff] [blame] | 1649 | if (waitqueue_active(&ctx->poll_wait)) { |
| 1650 | wake_up_interruptible(&ctx->poll_wait); |
Pavel Begunkov | 4aa84f2 | 2021-01-07 03:15:42 +0000 | [diff] [blame] | 1651 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
| 1652 | } |
Jens Axboe | 8c83878 | 2019-03-12 15:48:16 -0600 | [diff] [blame] | 1653 | } |
| 1654 | |
Pavel Begunkov | 80c18e4 | 2021-01-07 03:15:41 +0000 | [diff] [blame] | 1655 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
| 1656 | { |
Pavel Begunkov | c57a91fb | 2021-09-08 20:49:17 +0100 | [diff] [blame] | 1657 | /* see waitqueue_active() comment */ |
| 1658 | smp_mb(); |
| 1659 | |
Pavel Begunkov | 80c18e4 | 2021-01-07 03:15:41 +0000 | [diff] [blame] | 1660 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
Pavel Begunkov | c57a91fb | 2021-09-08 20:49:17 +0100 | [diff] [blame] | 1661 | if (waitqueue_active(&ctx->cq_wait)) |
Jens Axboe | 5fd4617 | 2021-08-06 14:04:31 -0600 | [diff] [blame] | 1662 | wake_up_all(&ctx->cq_wait); |
Pavel Begunkov | 80c18e4 | 2021-01-07 03:15:41 +0000 | [diff] [blame] | 1663 | } |
| 1664 | if (io_should_trigger_evfd(ctx)) |
| 1665 | eventfd_signal(ctx->cq_ev_fd, 1); |
Pavel Begunkov | 311997b | 2021-06-14 23:37:28 +0100 | [diff] [blame] | 1666 | if (waitqueue_active(&ctx->poll_wait)) { |
| 1667 | wake_up_interruptible(&ctx->poll_wait); |
Pavel Begunkov | 4aa84f2 | 2021-01-07 03:15:42 +0000 | [diff] [blame] | 1668 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
| 1669 | } |
Pavel Begunkov | 80c18e4 | 2021-01-07 03:15:41 +0000 | [diff] [blame] | 1670 | } |
| 1671 | |
Jens Axboe | c4a2ed7 | 2019-11-21 21:01:26 -0700 | [diff] [blame] | 1672 | /* Returns true if there are no backlogged entries after the flush */ |
Pavel Begunkov | 6c2450a | 2021-02-23 12:40:22 +0000 | [diff] [blame] | 1673 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1674 | { |
Jens Axboe | b18032b | 2021-01-24 16:58:56 -0700 | [diff] [blame] | 1675 | bool all_flushed, posted; |
Jens Axboe | 1d7bb1d | 2019-11-06 11:31:17 -0700 | [diff] [blame] | 1676 | |
Pavel Begunkov | a566c55 | 2021-05-16 22:58:08 +0100 | [diff] [blame] | 1677 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
Pavel Begunkov | e23de15 | 2020-12-17 00:24:37 +0000 | [diff] [blame] | 1678 | return false; |
Jens Axboe | 1d7bb1d | 2019-11-06 11:31:17 -0700 | [diff] [blame] | 1679 | |
Jens Axboe | b18032b | 2021-01-24 16:58:56 -0700 | [diff] [blame] | 1680 | posted = false; |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 1681 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | 6c2450a | 2021-02-23 12:40:22 +0000 | [diff] [blame] | 1682 | while (!list_empty(&ctx->cq_overflow_list)) { |
Pavel Begunkov | d068b50 | 2021-05-16 22:58:11 +0100 | [diff] [blame] | 1683 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
Pavel Begunkov | 6c2450a | 2021-02-23 12:40:22 +0000 | [diff] [blame] | 1684 | struct io_overflow_cqe *ocqe; |
Jens Axboe | e6c8aa9 | 2020-09-28 13:10:13 -0600 | [diff] [blame] | 1685 | |
Jens Axboe | 1d7bb1d | 2019-11-06 11:31:17 -0700 | [diff] [blame] | 1686 | if (!cqe && !force) |
| 1687 | break; |
Pavel Begunkov | 6c2450a | 2021-02-23 12:40:22 +0000 | [diff] [blame] | 1688 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
| 1689 | struct io_overflow_cqe, list); |
| 1690 | if (cqe) |
| 1691 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); |
| 1692 | else |
Pavel Begunkov | 8f6ed49 | 2021-05-16 22:58:10 +0100 | [diff] [blame] | 1693 | io_account_cq_overflow(ctx); |
| 1694 | |
Jens Axboe | b18032b | 2021-01-24 16:58:56 -0700 | [diff] [blame] | 1695 | posted = true; |
Pavel Begunkov | 6c2450a | 2021-02-23 12:40:22 +0000 | [diff] [blame] | 1696 | list_del(&ocqe->list); |
| 1697 | kfree(ocqe); |
Jens Axboe | 1d7bb1d | 2019-11-06 11:31:17 -0700 | [diff] [blame] | 1698 | } |
| 1699 | |
Pavel Begunkov | 09e8840 | 2020-12-17 00:24:38 +0000 | [diff] [blame] | 1700 | all_flushed = list_empty(&ctx->cq_overflow_list); |
| 1701 | if (all_flushed) { |
Pavel Begunkov | 5ed7a37 | 2021-06-14 23:37:27 +0100 | [diff] [blame] | 1702 | clear_bit(0, &ctx->check_cq_overflow); |
Nadav Amit | 20c0b38 | 2021-08-07 17:13:42 -0700 | [diff] [blame] | 1703 | WRITE_ONCE(ctx->rings->sq_flags, |
| 1704 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); |
Pavel Begunkov | 09e8840 | 2020-12-17 00:24:38 +0000 | [diff] [blame] | 1705 | } |
Pavel Begunkov | 4693014 | 2020-07-30 18:43:49 +0300 | [diff] [blame] | 1706 | |
Jens Axboe | b18032b | 2021-01-24 16:58:56 -0700 | [diff] [blame] | 1707 | if (posted) |
| 1708 | io_commit_cqring(ctx); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 1709 | spin_unlock(&ctx->completion_lock); |
Jens Axboe | b18032b | 2021-01-24 16:58:56 -0700 | [diff] [blame] | 1710 | if (posted) |
| 1711 | io_cqring_ev_posted(ctx); |
Pavel Begunkov | 09e8840 | 2020-12-17 00:24:38 +0000 | [diff] [blame] | 1712 | return all_flushed; |
Jens Axboe | 1d7bb1d | 2019-11-06 11:31:17 -0700 | [diff] [blame] | 1713 | } |
| 1714 | |
Pavel Begunkov | 90f6736 | 2021-08-09 20:18:12 +0100 | [diff] [blame] | 1715 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
Pavel Begunkov | 6c50315 | 2021-01-04 20:36:36 +0000 | [diff] [blame] | 1716 | { |
Jens Axboe | ca0a265 | 2021-03-04 17:15:48 -0700 | [diff] [blame] | 1717 | bool ret = true; |
| 1718 | |
Pavel Begunkov | 5ed7a37 | 2021-06-14 23:37:27 +0100 | [diff] [blame] | 1719 | if (test_bit(0, &ctx->check_cq_overflow)) { |
Pavel Begunkov | 6c50315 | 2021-01-04 20:36:36 +0000 | [diff] [blame] | 1720 | /* iopoll syncs against uring_lock, not completion_lock */ |
| 1721 | if (ctx->flags & IORING_SETUP_IOPOLL) |
| 1722 | mutex_lock(&ctx->uring_lock); |
Pavel Begunkov | 90f6736 | 2021-08-09 20:18:12 +0100 | [diff] [blame] | 1723 | ret = __io_cqring_overflow_flush(ctx, false); |
Pavel Begunkov | 6c50315 | 2021-01-04 20:36:36 +0000 | [diff] [blame] | 1724 | if (ctx->flags & IORING_SETUP_IOPOLL) |
| 1725 | mutex_unlock(&ctx->uring_lock); |
| 1726 | } |
Jens Axboe | ca0a265 | 2021-03-04 17:15:48 -0700 | [diff] [blame] | 1727 | |
| 1728 | return ret; |
Pavel Begunkov | 6c50315 | 2021-01-04 20:36:36 +0000 | [diff] [blame] | 1729 | } |
| 1730 | |
Pavel Begunkov | 6a290a1 | 2021-08-09 13:04:13 +0100 | [diff] [blame] | 1731 | /* must to be called somewhat shortly after putting a request */ |
| 1732 | static inline void io_put_task(struct task_struct *task, int nr) |
| 1733 | { |
| 1734 | struct io_uring_task *tctx = task->io_uring; |
| 1735 | |
Pavel Begunkov | e98e49b | 2021-08-18 17:01:43 +0100 | [diff] [blame] | 1736 | if (likely(task == current)) { |
| 1737 | tctx->cached_refs += nr; |
| 1738 | } else { |
| 1739 | percpu_counter_sub(&tctx->inflight, nr); |
| 1740 | if (unlikely(atomic_read(&tctx->in_idle))) |
| 1741 | wake_up(&tctx->wait); |
| 1742 | put_task_struct_many(task, nr); |
| 1743 | } |
Pavel Begunkov | 6a290a1 | 2021-08-09 13:04:13 +0100 | [diff] [blame] | 1744 | } |
| 1745 | |
Pavel Begunkov | 9a10867 | 2021-08-27 11:55:01 +0100 | [diff] [blame] | 1746 | static void io_task_refs_refill(struct io_uring_task *tctx) |
| 1747 | { |
| 1748 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; |
| 1749 | |
| 1750 | percpu_counter_add(&tctx->inflight, refill); |
| 1751 | refcount_add(refill, ¤t->usage); |
| 1752 | tctx->cached_refs += refill; |
| 1753 | } |
| 1754 | |
| 1755 | static inline void io_get_task_refs(int nr) |
| 1756 | { |
| 1757 | struct io_uring_task *tctx = current->io_uring; |
| 1758 | |
| 1759 | tctx->cached_refs -= nr; |
| 1760 | if (unlikely(tctx->cached_refs < 0)) |
| 1761 | io_task_refs_refill(tctx); |
| 1762 | } |
| 1763 | |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1764 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
| 1765 | long res, unsigned int cflags) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1766 | { |
Pavel Begunkov | cce4b8b | 2021-04-13 02:58:44 +0100 | [diff] [blame] | 1767 | struct io_overflow_cqe *ocqe; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1768 | |
Pavel Begunkov | cce4b8b | 2021-04-13 02:58:44 +0100 | [diff] [blame] | 1769 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
| 1770 | if (!ocqe) { |
| 1771 | /* |
| 1772 | * If we're in ring overflow flush mode, or in task cancel mode, |
| 1773 | * or cannot allocate an overflow entry, then we need to drop it |
| 1774 | * on the floor. |
| 1775 | */ |
Pavel Begunkov | 8f6ed49 | 2021-05-16 22:58:10 +0100 | [diff] [blame] | 1776 | io_account_cq_overflow(ctx); |
Pavel Begunkov | cce4b8b | 2021-04-13 02:58:44 +0100 | [diff] [blame] | 1777 | return false; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1778 | } |
Pavel Begunkov | cce4b8b | 2021-04-13 02:58:44 +0100 | [diff] [blame] | 1779 | if (list_empty(&ctx->cq_overflow_list)) { |
Pavel Begunkov | 5ed7a37 | 2021-06-14 23:37:27 +0100 | [diff] [blame] | 1780 | set_bit(0, &ctx->check_cq_overflow); |
Nadav Amit | 20c0b38 | 2021-08-07 17:13:42 -0700 | [diff] [blame] | 1781 | WRITE_ONCE(ctx->rings->sq_flags, |
| 1782 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); |
| 1783 | |
Pavel Begunkov | cce4b8b | 2021-04-13 02:58:44 +0100 | [diff] [blame] | 1784 | } |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1785 | ocqe->cqe.user_data = user_data; |
Pavel Begunkov | cce4b8b | 2021-04-13 02:58:44 +0100 | [diff] [blame] | 1786 | ocqe->cqe.res = res; |
| 1787 | ocqe->cqe.flags = cflags; |
| 1788 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); |
| 1789 | return true; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1790 | } |
| 1791 | |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1792 | static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
| 1793 | long res, unsigned int cflags) |
Pavel Begunkov | 8d13326 | 2021-04-11 01:46:33 +0100 | [diff] [blame] | 1794 | { |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1795 | struct io_uring_cqe *cqe; |
| 1796 | |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1797 | trace_io_uring_complete(ctx, user_data, res, cflags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1798 | |
| 1799 | /* |
| 1800 | * If we can't get a cq entry, userspace overflowed the |
| 1801 | * submission (by quite a lot). Increment the overflow count in |
| 1802 | * the ring. |
| 1803 | */ |
Pavel Begunkov | d068b50 | 2021-05-16 22:58:11 +0100 | [diff] [blame] | 1804 | cqe = io_get_cqe(ctx); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1805 | if (likely(cqe)) { |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1806 | WRITE_ONCE(cqe->user_data, user_data); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1807 | WRITE_ONCE(cqe->res, res); |
| 1808 | WRITE_ONCE(cqe->flags, cflags); |
Pavel Begunkov | 8d13326 | 2021-04-11 01:46:33 +0100 | [diff] [blame] | 1809 | return true; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1810 | } |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1811 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1812 | } |
| 1813 | |
Pavel Begunkov | 8d13326 | 2021-04-11 01:46:33 +0100 | [diff] [blame] | 1814 | /* not as hot to bloat with inlining */ |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1815 | static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
| 1816 | long res, unsigned int cflags) |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 1817 | { |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1818 | return __io_cqring_fill_event(ctx, user_data, res, cflags); |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 1819 | } |
| 1820 | |
Pavel Begunkov | 7a61235 | 2021-03-09 00:37:59 +0000 | [diff] [blame] | 1821 | static void io_req_complete_post(struct io_kiocb *req, long res, |
| 1822 | unsigned int cflags) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1823 | { |
Jens Axboe | 78e19bb | 2019-11-06 15:21:34 -0700 | [diff] [blame] | 1824 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1825 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 1826 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 1827 | __io_cqring_fill_event(ctx, req->user_data, res, cflags); |
Jens Axboe | c7dae4b | 2021-02-09 19:53:37 -0700 | [diff] [blame] | 1828 | /* |
| 1829 | * If we're the last reference to this request, add to our locked |
| 1830 | * free_list cache. |
| 1831 | */ |
Jens Axboe | de9b4cc | 2021-02-24 13:28:27 -0700 | [diff] [blame] | 1832 | if (req_ref_put_and_test(req)) { |
Pavel Begunkov | 7a61235 | 2021-03-09 00:37:59 +0000 | [diff] [blame] | 1833 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
Pavel Begunkov | 0756a86 | 2021-08-15 10:40:25 +0100 | [diff] [blame] | 1834 | if (req->flags & IO_DISARM_MASK) |
Pavel Begunkov | 7a61235 | 2021-03-09 00:37:59 +0000 | [diff] [blame] | 1835 | io_disarm_next(req); |
| 1836 | if (req->link) { |
| 1837 | io_req_task_queue(req->link); |
| 1838 | req->link = NULL; |
| 1839 | } |
| 1840 | } |
Jens Axboe | c7dae4b | 2021-02-09 19:53:37 -0700 | [diff] [blame] | 1841 | io_dismantle_req(req); |
| 1842 | io_put_task(req->task, 1); |
Pavel Begunkov | bb943b8 | 2021-08-09 20:18:10 +0100 | [diff] [blame] | 1843 | list_add(&req->inflight_entry, &ctx->locked_free_list); |
Pavel Begunkov | d0acdee | 2021-05-16 22:58:12 +0100 | [diff] [blame] | 1844 | ctx->locked_free_nr++; |
Pavel Begunkov | 180f829 | 2021-03-14 20:57:09 +0000 | [diff] [blame] | 1845 | } else { |
| 1846 | if (!percpu_ref_tryget(&ctx->refs)) |
| 1847 | req = NULL; |
| 1848 | } |
Pavel Begunkov | 7a61235 | 2021-03-09 00:37:59 +0000 | [diff] [blame] | 1849 | io_commit_cqring(ctx); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 1850 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | 7a61235 | 2021-03-09 00:37:59 +0000 | [diff] [blame] | 1851 | |
Pavel Begunkov | 180f829 | 2021-03-14 20:57:09 +0000 | [diff] [blame] | 1852 | if (req) { |
| 1853 | io_cqring_ev_posted(ctx); |
Jens Axboe | c7dae4b | 2021-02-09 19:53:37 -0700 | [diff] [blame] | 1854 | percpu_ref_put(&ctx->refs); |
Pavel Begunkov | 180f829 | 2021-03-14 20:57:09 +0000 | [diff] [blame] | 1855 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1856 | } |
| 1857 | |
Jens Axboe | 4e3d9ff | 2021-04-15 17:44:34 -0600 | [diff] [blame] | 1858 | static inline bool io_req_needs_clean(struct io_kiocb *req) |
| 1859 | { |
Pavel Begunkov | c854357 | 2021-06-17 18:14:04 +0100 | [diff] [blame] | 1860 | return req->flags & IO_REQ_CLEAN_FLAGS; |
Jens Axboe | 4e3d9ff | 2021-04-15 17:44:34 -0600 | [diff] [blame] | 1861 | } |
| 1862 | |
Pavel Begunkov | a38d68d | 2021-01-19 13:32:45 +0000 | [diff] [blame] | 1863 | static void io_req_complete_state(struct io_kiocb *req, long res, |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 1864 | unsigned int cflags) |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 1865 | { |
Jens Axboe | 4e3d9ff | 2021-04-15 17:44:34 -0600 | [diff] [blame] | 1866 | if (io_req_needs_clean(req)) |
Pavel Begunkov | 68fb897 | 2021-03-19 17:22:41 +0000 | [diff] [blame] | 1867 | io_clean_op(req); |
Pavel Begunkov | a38d68d | 2021-01-19 13:32:45 +0000 | [diff] [blame] | 1868 | req->result = res; |
| 1869 | req->compl.cflags = cflags; |
Pavel Begunkov | e342c80 | 2021-01-19 13:32:47 +0000 | [diff] [blame] | 1870 | req->flags |= REQ_F_COMPLETE_INLINE; |
Jens Axboe | e1e1609 | 2020-06-22 09:17:17 -0600 | [diff] [blame] | 1871 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1872 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 1873 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
| 1874 | long res, unsigned cflags) |
Pavel Begunkov | a38d68d | 2021-01-19 13:32:45 +0000 | [diff] [blame] | 1875 | { |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 1876 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
| 1877 | io_req_complete_state(req, res, cflags); |
Pavel Begunkov | a38d68d | 2021-01-19 13:32:45 +0000 | [diff] [blame] | 1878 | else |
Jens Axboe | c7dae4b | 2021-02-09 19:53:37 -0700 | [diff] [blame] | 1879 | io_req_complete_post(req, res, cflags); |
Pavel Begunkov | a38d68d | 2021-01-19 13:32:45 +0000 | [diff] [blame] | 1880 | } |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 1881 | |
Pavel Begunkov | a38d68d | 2021-01-19 13:32:45 +0000 | [diff] [blame] | 1882 | static inline void io_req_complete(struct io_kiocb *req, long res) |
Jens Axboe | e1e1609 | 2020-06-22 09:17:17 -0600 | [diff] [blame] | 1883 | { |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 1884 | __io_req_complete(req, 0, res, 0); |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 1885 | } |
| 1886 | |
Pavel Begunkov | f41db273 | 2021-02-28 22:35:12 +0000 | [diff] [blame] | 1887 | static void io_req_complete_failed(struct io_kiocb *req, long res) |
| 1888 | { |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 1889 | req_set_fail(req); |
Pavel Begunkov | f41db273 | 2021-02-28 22:35:12 +0000 | [diff] [blame] | 1890 | io_req_complete_post(req, res, 0); |
| 1891 | } |
| 1892 | |
Pavel Begunkov | c6d3d9c | 2021-08-31 14:13:10 +0100 | [diff] [blame] | 1893 | static void io_req_complete_fail_submit(struct io_kiocb *req) |
| 1894 | { |
| 1895 | /* |
| 1896 | * We don't submit, fail them all, for that replace hardlinks with |
| 1897 | * normal links. Extra REQ_F_LINK is tolerated. |
| 1898 | */ |
| 1899 | req->flags &= ~REQ_F_HARDLINK; |
| 1900 | req->flags |= REQ_F_LINK; |
| 1901 | io_req_complete_failed(req, req->result); |
| 1902 | } |
| 1903 | |
Pavel Begunkov | 864ea92 | 2021-08-09 13:04:08 +0100 | [diff] [blame] | 1904 | /* |
| 1905 | * Don't initialise the fields below on every allocation, but do that in |
| 1906 | * advance and keep them valid across allocations. |
| 1907 | */ |
| 1908 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) |
| 1909 | { |
| 1910 | req->ctx = ctx; |
| 1911 | req->link = NULL; |
| 1912 | req->async_data = NULL; |
| 1913 | /* not necessary, but safer to zero */ |
| 1914 | req->result = 0; |
| 1915 | } |
| 1916 | |
Pavel Begunkov | dac7a09 | 2021-03-19 17:22:39 +0000 | [diff] [blame] | 1917 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 1918 | struct io_submit_state *state) |
Pavel Begunkov | dac7a09 | 2021-03-19 17:22:39 +0000 | [diff] [blame] | 1919 | { |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 1920 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 1921 | list_splice_init(&ctx->locked_free_list, &state->free_list); |
Pavel Begunkov | d0acdee | 2021-05-16 22:58:12 +0100 | [diff] [blame] | 1922 | ctx->locked_free_nr = 0; |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 1923 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | dac7a09 | 2021-03-19 17:22:39 +0000 | [diff] [blame] | 1924 | } |
| 1925 | |
Pavel Begunkov | dd78f49 | 2021-03-19 17:22:35 +0000 | [diff] [blame] | 1926 | /* Returns true IFF there are requests in the cache */ |
Jens Axboe | c7dae4b | 2021-02-09 19:53:37 -0700 | [diff] [blame] | 1927 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
Pavel Begunkov | e5d1bc0 | 2021-02-10 00:03:23 +0000 | [diff] [blame] | 1928 | { |
Jens Axboe | c7dae4b | 2021-02-09 19:53:37 -0700 | [diff] [blame] | 1929 | struct io_submit_state *state = &ctx->submit_state; |
Pavel Begunkov | dd78f49 | 2021-03-19 17:22:35 +0000 | [diff] [blame] | 1930 | int nr; |
Pavel Begunkov | e5d1bc0 | 2021-02-10 00:03:23 +0000 | [diff] [blame] | 1931 | |
Jens Axboe | c7dae4b | 2021-02-09 19:53:37 -0700 | [diff] [blame] | 1932 | /* |
| 1933 | * If we have more than a batch's worth of requests in our IRQ side |
| 1934 | * locked cache, grab the lock and move them over to our submission |
| 1935 | * side cache. |
| 1936 | */ |
Pavel Begunkov | d0acdee | 2021-05-16 22:58:12 +0100 | [diff] [blame] | 1937 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 1938 | io_flush_cached_locked_reqs(ctx, state); |
Jens Axboe | c7dae4b | 2021-02-09 19:53:37 -0700 | [diff] [blame] | 1939 | |
Pavel Begunkov | dd78f49 | 2021-03-19 17:22:35 +0000 | [diff] [blame] | 1940 | nr = state->free_reqs; |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 1941 | while (!list_empty(&state->free_list)) { |
| 1942 | struct io_kiocb *req = list_first_entry(&state->free_list, |
Pavel Begunkov | bb943b8 | 2021-08-09 20:18:10 +0100 | [diff] [blame] | 1943 | struct io_kiocb, inflight_entry); |
Pavel Begunkov | dd78f49 | 2021-03-19 17:22:35 +0000 | [diff] [blame] | 1944 | |
Pavel Begunkov | bb943b8 | 2021-08-09 20:18:10 +0100 | [diff] [blame] | 1945 | list_del(&req->inflight_entry); |
Pavel Begunkov | dd78f49 | 2021-03-19 17:22:35 +0000 | [diff] [blame] | 1946 | state->reqs[nr++] = req; |
| 1947 | if (nr == ARRAY_SIZE(state->reqs)) |
Pavel Begunkov | e5d1bc0 | 2021-02-10 00:03:23 +0000 | [diff] [blame] | 1948 | break; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1949 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1950 | |
Pavel Begunkov | dd78f49 | 2021-03-19 17:22:35 +0000 | [diff] [blame] | 1951 | state->free_reqs = nr; |
| 1952 | return nr != 0; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1953 | } |
| 1954 | |
Pavel Begunkov | 5d5901a | 2021-08-11 19:28:29 +0100 | [diff] [blame] | 1955 | /* |
| 1956 | * A request might get retired back into the request caches even before opcode |
| 1957 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. |
| 1958 | * Because of that, io_alloc_req() should be called only under ->uring_lock |
| 1959 | * and with extra caution to not get a request that is still worked on. |
| 1960 | */ |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 1961 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) |
Pavel Begunkov | 5d5901a | 2021-08-11 19:28:29 +0100 | [diff] [blame] | 1962 | __must_hold(&ctx->uring_lock) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1963 | { |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 1964 | struct io_submit_state *state = &ctx->submit_state; |
Pavel Begunkov | 864ea92 | 2021-08-09 13:04:08 +0100 | [diff] [blame] | 1965 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
| 1966 | int ret, i; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1967 | |
Pavel Begunkov | fe7e325 | 2021-06-24 15:09:57 +0100 | [diff] [blame] | 1968 | BUILD_BUG_ON(ARRAY_SIZE(state->reqs) < IO_REQ_ALLOC_BATCH); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1969 | |
Pavel Begunkov | 864ea92 | 2021-08-09 13:04:08 +0100 | [diff] [blame] | 1970 | if (likely(state->free_reqs || io_flush_cached_reqs(ctx))) |
| 1971 | goto got_req; |
Jens Axboe | 2579f91 | 2019-01-09 09:10:43 -0700 | [diff] [blame] | 1972 | |
Pavel Begunkov | 864ea92 | 2021-08-09 13:04:08 +0100 | [diff] [blame] | 1973 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
| 1974 | state->reqs); |
Pavel Begunkov | e5d1bc0 | 2021-02-10 00:03:23 +0000 | [diff] [blame] | 1975 | |
Pavel Begunkov | 864ea92 | 2021-08-09 13:04:08 +0100 | [diff] [blame] | 1976 | /* |
| 1977 | * Bulk alloc is all-or-nothing. If we fail to get a batch, |
| 1978 | * retry single alloc to be on the safe side. |
| 1979 | */ |
| 1980 | if (unlikely(ret <= 0)) { |
| 1981 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); |
| 1982 | if (!state->reqs[0]) |
| 1983 | return NULL; |
| 1984 | ret = 1; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1985 | } |
Pavel Begunkov | 864ea92 | 2021-08-09 13:04:08 +0100 | [diff] [blame] | 1986 | |
| 1987 | for (i = 0; i < ret; i++) |
| 1988 | io_preinit_req(state->reqs[i], ctx); |
| 1989 | state->free_reqs = ret; |
Pavel Begunkov | e5d1bc0 | 2021-02-10 00:03:23 +0000 | [diff] [blame] | 1990 | got_req: |
Pavel Begunkov | 291b282 | 2020-09-30 22:57:01 +0300 | [diff] [blame] | 1991 | state->free_reqs--; |
| 1992 | return state->reqs[state->free_reqs]; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 1993 | } |
| 1994 | |
Pavel Begunkov | e1d767f | 2021-03-19 17:22:43 +0000 | [diff] [blame] | 1995 | static inline void io_put_file(struct file *file) |
Pavel Begunkov | 8da11c1 | 2020-02-24 11:32:44 +0300 | [diff] [blame] | 1996 | { |
Pavel Begunkov | e1d767f | 2021-03-19 17:22:43 +0000 | [diff] [blame] | 1997 | if (file) |
Pavel Begunkov | 8da11c1 | 2020-02-24 11:32:44 +0300 | [diff] [blame] | 1998 | fput(file); |
| 1999 | } |
| 2000 | |
Pavel Begunkov | 4edf20f | 2020-10-13 09:43:59 +0100 | [diff] [blame] | 2001 | static void io_dismantle_req(struct io_kiocb *req) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2002 | { |
Pavel Begunkov | 094bae4 | 2021-03-19 17:22:42 +0000 | [diff] [blame] | 2003 | unsigned int flags = req->flags; |
Pavel Begunkov | 929a3af | 2020-02-19 00:19:09 +0300 | [diff] [blame] | 2004 | |
Pavel Begunkov | 3a0a690 | 2021-04-20 12:03:31 +0100 | [diff] [blame] | 2005 | if (io_req_needs_clean(req)) |
| 2006 | io_clean_op(req); |
Pavel Begunkov | e1d767f | 2021-03-19 17:22:43 +0000 | [diff] [blame] | 2007 | if (!(flags & REQ_F_FIXED_FILE)) |
| 2008 | io_put_file(req->file); |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 2009 | if (req->fixed_rsrc_refs) |
| 2010 | percpu_ref_put(req->fixed_rsrc_refs); |
Pavel Begunkov | 99ebe4e | 2021-06-26 21:40:49 +0100 | [diff] [blame] | 2011 | if (req->async_data) { |
Pavel Begunkov | 094bae4 | 2021-03-19 17:22:42 +0000 | [diff] [blame] | 2012 | kfree(req->async_data); |
Pavel Begunkov | 99ebe4e | 2021-06-26 21:40:49 +0100 | [diff] [blame] | 2013 | req->async_data = NULL; |
| 2014 | } |
Pavel Begunkov | e6543a8 | 2020-06-28 12:52:30 +0300 | [diff] [blame] | 2015 | } |
Pavel Begunkov | 2b85edf | 2019-12-28 14:13:03 +0300 | [diff] [blame] | 2016 | |
Pavel Begunkov | 216578e | 2020-10-13 09:44:00 +0100 | [diff] [blame] | 2017 | static void __io_free_req(struct io_kiocb *req) |
Pavel Begunkov | e6543a8 | 2020-06-28 12:52:30 +0300 | [diff] [blame] | 2018 | { |
Jens Axboe | 51a4cc1 | 2020-08-10 10:55:56 -0600 | [diff] [blame] | 2019 | struct io_ring_ctx *ctx = req->ctx; |
Pavel Begunkov | ecfc517 | 2020-06-29 13:13:03 +0300 | [diff] [blame] | 2020 | |
Pavel Begunkov | 216578e | 2020-10-13 09:44:00 +0100 | [diff] [blame] | 2021 | io_dismantle_req(req); |
Pavel Begunkov | 7c66073 | 2021-01-25 11:42:21 +0000 | [diff] [blame] | 2022 | io_put_task(req->task, 1); |
Pavel Begunkov | e6543a8 | 2020-06-28 12:52:30 +0300 | [diff] [blame] | 2023 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 2024 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | bb943b8 | 2021-08-09 20:18:10 +0100 | [diff] [blame] | 2025 | list_add(&req->inflight_entry, &ctx->locked_free_list); |
Pavel Begunkov | c34b025 | 2021-08-09 20:18:08 +0100 | [diff] [blame] | 2026 | ctx->locked_free_nr++; |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 2027 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | c34b025 | 2021-08-09 20:18:08 +0100 | [diff] [blame] | 2028 | |
Pavel Begunkov | ecfc517 | 2020-06-29 13:13:03 +0300 | [diff] [blame] | 2029 | percpu_ref_put(&ctx->refs); |
Jens Axboe | e65ef56 | 2019-03-12 10:16:44 -0600 | [diff] [blame] | 2030 | } |
| 2031 | |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2032 | static inline void io_remove_next_linked(struct io_kiocb *req) |
| 2033 | { |
| 2034 | struct io_kiocb *nxt = req->link; |
| 2035 | |
| 2036 | req->link = nxt->link; |
| 2037 | nxt->link = NULL; |
| 2038 | } |
| 2039 | |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2040 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
| 2041 | __must_hold(&req->ctx->completion_lock) |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 2042 | __must_hold(&req->ctx->timeout_lock) |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 2043 | { |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2044 | struct io_kiocb *link = req->link; |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2045 | |
Pavel Begunkov | b97e736 | 2021-08-15 10:40:23 +0100 | [diff] [blame] | 2046 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
Pavel Begunkov | c9abd7a | 2020-10-22 16:43:11 +0100 | [diff] [blame] | 2047 | struct io_timeout_data *io = link->async_data; |
Pavel Begunkov | 7c86ffe | 2020-06-29 13:12:59 +0300 | [diff] [blame] | 2048 | |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2049 | io_remove_next_linked(req); |
Pavel Begunkov | 90cd7e4 | 2020-10-27 23:25:36 +0000 | [diff] [blame] | 2050 | link->timeout.head = NULL; |
Pavel Begunkov | fd9c7bc | 2021-04-13 02:58:42 +0100 | [diff] [blame] | 2051 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
Pavel Begunkov | ef9dd63 | 2021-08-28 19:54:38 -0600 | [diff] [blame] | 2052 | list_del(&link->timeout.list); |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 2053 | io_cqring_fill_event(link->ctx, link->user_data, |
| 2054 | -ECANCELED, 0); |
Pavel Begunkov | 91c2f69 | 2021-08-11 19:28:28 +0100 | [diff] [blame] | 2055 | io_put_req_deferred(link); |
Pavel Begunkov | d4729fb | 2021-03-22 01:58:24 +0000 | [diff] [blame] | 2056 | return true; |
Pavel Begunkov | c9abd7a | 2020-10-22 16:43:11 +0100 | [diff] [blame] | 2057 | } |
| 2058 | } |
Pavel Begunkov | d4729fb | 2021-03-22 01:58:24 +0000 | [diff] [blame] | 2059 | return false; |
Pavel Begunkov | 7c86ffe | 2020-06-29 13:12:59 +0300 | [diff] [blame] | 2060 | } |
| 2061 | |
Pavel Begunkov | d148ca4 | 2020-10-18 10:17:39 +0100 | [diff] [blame] | 2062 | static void io_fail_links(struct io_kiocb *req) |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2063 | __must_hold(&req->ctx->completion_lock) |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 2064 | { |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2065 | struct io_kiocb *nxt, *link = req->link; |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 2066 | |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2067 | req->link = NULL; |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2068 | while (link) { |
Hao Xu | a8295b9 | 2021-08-27 17:46:09 +0800 | [diff] [blame] | 2069 | long res = -ECANCELED; |
| 2070 | |
| 2071 | if (link->flags & REQ_F_FAIL) |
| 2072 | res = link->result; |
| 2073 | |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2074 | nxt = link->link; |
| 2075 | link->link = NULL; |
| 2076 | |
Dmitrii Dolgov | c826bd7 | 2019-10-15 19:02:01 +0200 | [diff] [blame] | 2077 | trace_io_uring_fail_link(req, link); |
Hao Xu | a8295b9 | 2021-08-27 17:46:09 +0800 | [diff] [blame] | 2078 | io_cqring_fill_event(link->ctx, link->user_data, res, 0); |
Pavel Begunkov | 91c2f69 | 2021-08-11 19:28:28 +0100 | [diff] [blame] | 2079 | io_put_req_deferred(link); |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2080 | link = nxt; |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 2081 | } |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2082 | } |
Pavel Begunkov | 7c86ffe | 2020-06-29 13:12:59 +0300 | [diff] [blame] | 2083 | |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2084 | static bool io_disarm_next(struct io_kiocb *req) |
| 2085 | __must_hold(&req->ctx->completion_lock) |
| 2086 | { |
| 2087 | bool posted = false; |
| 2088 | |
Pavel Begunkov | 0756a86 | 2021-08-15 10:40:25 +0100 | [diff] [blame] | 2089 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
| 2090 | struct io_kiocb *link = req->link; |
| 2091 | |
Pavel Begunkov | 906c6ca | 2021-08-15 10:40:26 +0100 | [diff] [blame] | 2092 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
Pavel Begunkov | 0756a86 | 2021-08-15 10:40:25 +0100 | [diff] [blame] | 2093 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
| 2094 | io_remove_next_linked(req); |
| 2095 | io_cqring_fill_event(link->ctx, link->user_data, |
| 2096 | -ECANCELED, 0); |
| 2097 | io_put_req_deferred(link); |
| 2098 | posted = true; |
| 2099 | } |
| 2100 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 2101 | struct io_ring_ctx *ctx = req->ctx; |
| 2102 | |
| 2103 | spin_lock_irq(&ctx->timeout_lock); |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2104 | posted = io_kill_linked_timeout(req); |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 2105 | spin_unlock_irq(&ctx->timeout_lock); |
| 2106 | } |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 2107 | if (unlikely((req->flags & REQ_F_FAIL) && |
Pavel Begunkov | e4335ed | 2021-04-11 01:46:39 +0100 | [diff] [blame] | 2108 | !(req->flags & REQ_F_HARDLINK))) { |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2109 | posted |= (req->link != NULL); |
| 2110 | io_fail_links(req); |
| 2111 | } |
| 2112 | return posted; |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 2113 | } |
| 2114 | |
Pavel Begunkov | 3fa5e0f | 2020-06-30 15:20:43 +0300 | [diff] [blame] | 2115 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 2116 | { |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2117 | struct io_kiocb *nxt; |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 2118 | |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 2119 | /* |
| 2120 | * If LINK is set, we have dependent requests in this chain. If we |
| 2121 | * didn't fail this request, queue the first one up, moving any other |
| 2122 | * dependencies to the next request. In case of failure, fail the rest |
| 2123 | * of the chain. |
| 2124 | */ |
Pavel Begunkov | 0756a86 | 2021-08-15 10:40:25 +0100 | [diff] [blame] | 2125 | if (req->flags & IO_DISARM_MASK) { |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2126 | struct io_ring_ctx *ctx = req->ctx; |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2127 | bool posted; |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2128 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 2129 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2130 | posted = io_disarm_next(req); |
| 2131 | if (posted) |
| 2132 | io_commit_cqring(req->ctx); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 2133 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2134 | if (posted) |
| 2135 | io_cqring_ev_posted(ctx); |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2136 | } |
Pavel Begunkov | 33cc89a | 2021-03-09 00:37:58 +0000 | [diff] [blame] | 2137 | nxt = req->link; |
| 2138 | req->link = NULL; |
| 2139 | return nxt; |
Jens Axboe | 4d7dd46 | 2019-11-20 13:03:52 -0700 | [diff] [blame] | 2140 | } |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 2141 | |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2142 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
Pavel Begunkov | 3fa5e0f | 2020-06-30 15:20:43 +0300 | [diff] [blame] | 2143 | { |
Pavel Begunkov | cdbff98 | 2021-02-12 18:41:16 +0000 | [diff] [blame] | 2144 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
Pavel Begunkov | 3fa5e0f | 2020-06-30 15:20:43 +0300 | [diff] [blame] | 2145 | return NULL; |
| 2146 | return __io_req_find_next(req); |
| 2147 | } |
| 2148 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2149 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
Pavel Begunkov | 2c32395 | 2021-02-28 22:04:53 +0000 | [diff] [blame] | 2150 | { |
| 2151 | if (!ctx) |
| 2152 | return; |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2153 | if (*locked) { |
Hao Xu | 99c8bc5 | 2021-08-21 06:19:54 +0800 | [diff] [blame] | 2154 | if (ctx->submit_state.compl_nr) |
| 2155 | io_submit_flush_completions(ctx); |
Pavel Begunkov | 2c32395 | 2021-02-28 22:04:53 +0000 | [diff] [blame] | 2156 | mutex_unlock(&ctx->uring_lock); |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2157 | *locked = false; |
Pavel Begunkov | 2c32395 | 2021-02-28 22:04:53 +0000 | [diff] [blame] | 2158 | } |
| 2159 | percpu_ref_put(&ctx->refs); |
| 2160 | } |
| 2161 | |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2162 | static void tctx_task_work(struct callback_head *cb) |
| 2163 | { |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2164 | bool locked = false; |
Pavel Begunkov | ebd0df2 | 2021-06-17 18:14:07 +0100 | [diff] [blame] | 2165 | struct io_ring_ctx *ctx = NULL; |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2166 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
| 2167 | task_work); |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2168 | |
Pavel Begunkov | 16f7207 | 2021-06-17 18:14:09 +0100 | [diff] [blame] | 2169 | while (1) { |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2170 | struct io_wq_work_node *node; |
| 2171 | |
Pavel Begunkov | 8d4ad41 | 2021-09-02 00:38:23 +0100 | [diff] [blame] | 2172 | if (!tctx->task_list.first && locked && ctx->submit_state.compl_nr) |
| 2173 | io_submit_flush_completions(ctx); |
| 2174 | |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2175 | spin_lock_irq(&tctx->task_lock); |
Pavel Begunkov | c6538be | 2021-06-17 18:14:08 +0100 | [diff] [blame] | 2176 | node = tctx->task_list.first; |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2177 | INIT_WQ_LIST(&tctx->task_list); |
Pavel Begunkov | 6294f36 | 2021-08-10 17:53:55 +0100 | [diff] [blame] | 2178 | if (!node) |
| 2179 | tctx->task_running = false; |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2180 | spin_unlock_irq(&tctx->task_lock); |
Pavel Begunkov | 6294f36 | 2021-08-10 17:53:55 +0100 | [diff] [blame] | 2181 | if (!node) |
| 2182 | break; |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2183 | |
Pavel Begunkov | 6294f36 | 2021-08-10 17:53:55 +0100 | [diff] [blame] | 2184 | do { |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2185 | struct io_wq_work_node *next = node->next; |
| 2186 | struct io_kiocb *req = container_of(node, struct io_kiocb, |
| 2187 | io_task_work.node); |
| 2188 | |
| 2189 | if (req->ctx != ctx) { |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2190 | ctx_flush_and_put(ctx, &locked); |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2191 | ctx = req->ctx; |
Pavel Begunkov | 126180b | 2021-08-18 12:42:47 +0100 | [diff] [blame] | 2192 | /* if not contended, grab and improve batching */ |
| 2193 | locked = mutex_trylock(&ctx->uring_lock); |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2194 | percpu_ref_get(&ctx->refs); |
| 2195 | } |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2196 | req->io_task_work.func(req, &locked); |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2197 | node = next; |
Pavel Begunkov | 6294f36 | 2021-08-10 17:53:55 +0100 | [diff] [blame] | 2198 | } while (node); |
| 2199 | |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2200 | cond_resched(); |
Pavel Begunkov | 3f18407 | 2021-06-17 18:14:06 +0100 | [diff] [blame] | 2201 | } |
Pavel Begunkov | ebd0df2 | 2021-06-17 18:14:07 +0100 | [diff] [blame] | 2202 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2203 | ctx_flush_and_put(ctx, &locked); |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2204 | } |
| 2205 | |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 2206 | static void io_req_task_work_add(struct io_kiocb *req) |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2207 | { |
Pavel Begunkov | c15b79d | 2021-03-19 17:22:44 +0000 | [diff] [blame] | 2208 | struct task_struct *tsk = req->task; |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2209 | struct io_uring_task *tctx = tsk->io_uring; |
Pavel Begunkov | c15b79d | 2021-03-19 17:22:44 +0000 | [diff] [blame] | 2210 | enum task_work_notify_mode notify; |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 2211 | struct io_wq_work_node *node; |
Jens Axboe | 0b81e80 | 2021-02-16 10:33:53 -0700 | [diff] [blame] | 2212 | unsigned long flags; |
Pavel Begunkov | 6294f36 | 2021-08-10 17:53:55 +0100 | [diff] [blame] | 2213 | bool running; |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2214 | |
| 2215 | WARN_ON_ONCE(!tctx); |
| 2216 | |
Jens Axboe | 0b81e80 | 2021-02-16 10:33:53 -0700 | [diff] [blame] | 2217 | spin_lock_irqsave(&tctx->task_lock, flags); |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2218 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
Pavel Begunkov | 6294f36 | 2021-08-10 17:53:55 +0100 | [diff] [blame] | 2219 | running = tctx->task_running; |
| 2220 | if (!running) |
| 2221 | tctx->task_running = true; |
Jens Axboe | 0b81e80 | 2021-02-16 10:33:53 -0700 | [diff] [blame] | 2222 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2223 | |
| 2224 | /* task_work already pending, we're done */ |
Pavel Begunkov | 6294f36 | 2021-08-10 17:53:55 +0100 | [diff] [blame] | 2225 | if (running) |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 2226 | return; |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2227 | |
Pavel Begunkov | c15b79d | 2021-03-19 17:22:44 +0000 | [diff] [blame] | 2228 | /* |
| 2229 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
| 2230 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're |
| 2231 | * processing task_work. There's no reliable way to tell if TWA_RESUME |
| 2232 | * will do the job. |
| 2233 | */ |
| 2234 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; |
Pavel Begunkov | c15b79d | 2021-03-19 17:22:44 +0000 | [diff] [blame] | 2235 | if (!task_work_add(tsk, &tctx->task_work, notify)) { |
| 2236 | wake_up_process(tsk); |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 2237 | return; |
Pavel Begunkov | c15b79d | 2021-03-19 17:22:44 +0000 | [diff] [blame] | 2238 | } |
Pavel Begunkov | 2215bed | 2021-08-09 13:04:06 +0100 | [diff] [blame] | 2239 | |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 2240 | spin_lock_irqsave(&tctx->task_lock, flags); |
Pavel Begunkov | 6294f36 | 2021-08-10 17:53:55 +0100 | [diff] [blame] | 2241 | tctx->task_running = false; |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 2242 | node = tctx->task_list.first; |
| 2243 | INIT_WQ_LIST(&tctx->task_list); |
| 2244 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 2245 | |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 2246 | while (node) { |
| 2247 | req = container_of(node, struct io_kiocb, io_task_work.node); |
| 2248 | node = node->next; |
| 2249 | if (llist_add(&req->io_task_work.fallback_node, |
| 2250 | &req->ctx->fallback_llist)) |
| 2251 | schedule_delayed_work(&req->ctx->fallback_work, 1); |
| 2252 | } |
Pavel Begunkov | eab30c4 | 2021-01-19 13:32:42 +0000 | [diff] [blame] | 2253 | } |
| 2254 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2255 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
Jens Axboe | c40f637 | 2020-06-25 15:39:59 -0600 | [diff] [blame] | 2256 | { |
Jens Axboe | 87ceb6a | 2020-09-14 08:20:12 -0600 | [diff] [blame] | 2257 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | c40f637 | 2020-06-25 15:39:59 -0600 | [diff] [blame] | 2258 | |
Pavel Begunkov | b18a1a4 | 2021-08-25 20:51:39 +0100 | [diff] [blame] | 2259 | /* not needed for normal modes, but SQPOLL depends on it */ |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2260 | io_tw_lock(ctx, locked); |
Pavel Begunkov | 2593553 | 2021-03-19 17:22:40 +0000 | [diff] [blame] | 2261 | io_req_complete_failed(req, req->result); |
Jens Axboe | c40f637 | 2020-06-25 15:39:59 -0600 | [diff] [blame] | 2262 | } |
| 2263 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2264 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
Jens Axboe | c40f637 | 2020-06-25 15:39:59 -0600 | [diff] [blame] | 2265 | { |
| 2266 | struct io_ring_ctx *ctx = req->ctx; |
| 2267 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2268 | io_tw_lock(ctx, locked); |
Jens Axboe | 316319e | 2021-08-19 09:41:42 -0600 | [diff] [blame] | 2269 | /* req->task == current here, checking PF_EXITING is safe */ |
Pavel Begunkov | af066f3 | 2021-08-09 13:04:19 +0100 | [diff] [blame] | 2270 | if (likely(!(req->task->flags & PF_EXITING))) |
Pavel Begunkov | c5eef2b94 | 2021-02-10 00:03:22 +0000 | [diff] [blame] | 2271 | __io_queue_sqe(req); |
Pavel Begunkov | 81b6d05 | 2021-01-04 20:36:35 +0000 | [diff] [blame] | 2272 | else |
Pavel Begunkov | 2593553 | 2021-03-19 17:22:40 +0000 | [diff] [blame] | 2273 | io_req_complete_failed(req, -EFAULT); |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 2274 | } |
| 2275 | |
Pavel Begunkov | a3df7698 | 2021-02-18 22:32:52 +0000 | [diff] [blame] | 2276 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
| 2277 | { |
Pavel Begunkov | a3df7698 | 2021-02-18 22:32:52 +0000 | [diff] [blame] | 2278 | req->result = ret; |
Pavel Begunkov | 5b0a6ac | 2021-06-30 21:54:04 +0100 | [diff] [blame] | 2279 | req->io_task_work.func = io_req_task_cancel; |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 2280 | io_req_task_work_add(req); |
Pavel Begunkov | a3df7698 | 2021-02-18 22:32:52 +0000 | [diff] [blame] | 2281 | } |
| 2282 | |
Pavel Begunkov | 2c4b8eb | 2021-02-28 22:35:10 +0000 | [diff] [blame] | 2283 | static void io_req_task_queue(struct io_kiocb *req) |
| 2284 | { |
Pavel Begunkov | 5b0a6ac | 2021-06-30 21:54:04 +0100 | [diff] [blame] | 2285 | req->io_task_work.func = io_req_task_submit; |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 2286 | io_req_task_work_add(req); |
Pavel Begunkov | 2c4b8eb | 2021-02-28 22:35:10 +0000 | [diff] [blame] | 2287 | } |
| 2288 | |
Jens Axboe | 773af69 | 2021-07-27 10:25:55 -0600 | [diff] [blame] | 2289 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
| 2290 | { |
| 2291 | req->io_task_work.func = io_queue_async_work; |
| 2292 | io_req_task_work_add(req); |
| 2293 | } |
| 2294 | |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2295 | static inline void io_queue_next(struct io_kiocb *req) |
Jackie Liu | c69f8db | 2019-11-09 11:00:08 +0800 | [diff] [blame] | 2296 | { |
Pavel Begunkov | 9b5f7bd9 | 2020-06-29 13:13:00 +0300 | [diff] [blame] | 2297 | struct io_kiocb *nxt = io_req_find_next(req); |
Pavel Begunkov | 944e58b | 2019-11-21 23:21:01 +0300 | [diff] [blame] | 2298 | |
Pavel Begunkov | 906a8c3 | 2020-06-27 14:04:55 +0300 | [diff] [blame] | 2299 | if (nxt) |
| 2300 | io_req_task_queue(nxt); |
Jackie Liu | c69f8db | 2019-11-09 11:00:08 +0800 | [diff] [blame] | 2301 | } |
| 2302 | |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 2303 | static void io_free_req(struct io_kiocb *req) |
| 2304 | { |
Pavel Begunkov | c352438 | 2020-06-28 12:52:32 +0300 | [diff] [blame] | 2305 | io_queue_next(req); |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 2306 | __io_free_req(req); |
Jens Axboe | e65ef56 | 2019-03-12 10:16:44 -0600 | [diff] [blame] | 2307 | } |
| 2308 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2309 | static void io_free_req_work(struct io_kiocb *req, bool *locked) |
| 2310 | { |
| 2311 | io_free_req(req); |
| 2312 | } |
| 2313 | |
Pavel Begunkov | 2d6500d | 2020-06-28 12:52:33 +0300 | [diff] [blame] | 2314 | struct req_batch { |
Pavel Begunkov | 5af1d13 | 2020-07-18 11:32:52 +0300 | [diff] [blame] | 2315 | struct task_struct *task; |
| 2316 | int task_refs; |
Jens Axboe | 1b4c351 | 2021-02-10 00:03:19 +0000 | [diff] [blame] | 2317 | int ctx_refs; |
Pavel Begunkov | 2d6500d | 2020-06-28 12:52:33 +0300 | [diff] [blame] | 2318 | }; |
| 2319 | |
Pavel Begunkov | 5af1d13 | 2020-07-18 11:32:52 +0300 | [diff] [blame] | 2320 | static inline void io_init_req_batch(struct req_batch *rb) |
Pavel Begunkov | 7a743e2 | 2020-03-03 21:33:13 +0300 | [diff] [blame] | 2321 | { |
Pavel Begunkov | 5af1d13 | 2020-07-18 11:32:52 +0300 | [diff] [blame] | 2322 | rb->task_refs = 0; |
Pavel Begunkov | 9ae7246 | 2021-02-10 00:03:16 +0000 | [diff] [blame] | 2323 | rb->ctx_refs = 0; |
Pavel Begunkov | 5af1d13 | 2020-07-18 11:32:52 +0300 | [diff] [blame] | 2324 | rb->task = NULL; |
| 2325 | } |
Pavel Begunkov | 8766dd5 | 2020-03-14 00:31:04 +0300 | [diff] [blame] | 2326 | |
Pavel Begunkov | 2d6500d | 2020-06-28 12:52:33 +0300 | [diff] [blame] | 2327 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
| 2328 | struct req_batch *rb) |
| 2329 | { |
Pavel Begunkov | 9ae7246 | 2021-02-10 00:03:16 +0000 | [diff] [blame] | 2330 | if (rb->ctx_refs) |
| 2331 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); |
Pavel Begunkov | e98e49b | 2021-08-18 17:01:43 +0100 | [diff] [blame] | 2332 | if (rb->task) |
Pavel Begunkov | e9dbe22 | 2021-08-09 13:04:20 +0100 | [diff] [blame] | 2333 | io_put_task(rb->task, rb->task_refs); |
Pavel Begunkov | 2d6500d | 2020-06-28 12:52:33 +0300 | [diff] [blame] | 2334 | } |
| 2335 | |
Pavel Begunkov | 6ff119a | 2021-02-10 00:03:18 +0000 | [diff] [blame] | 2336 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
| 2337 | struct io_submit_state *state) |
Pavel Begunkov | 2d6500d | 2020-06-28 12:52:33 +0300 | [diff] [blame] | 2338 | { |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 2339 | io_queue_next(req); |
Pavel Begunkov | 9667065 | 2021-03-19 17:22:32 +0000 | [diff] [blame] | 2340 | io_dismantle_req(req); |
Pavel Begunkov | 2d6500d | 2020-06-28 12:52:33 +0300 | [diff] [blame] | 2341 | |
Jens Axboe | e3bc8e9 | 2020-09-24 08:45:57 -0600 | [diff] [blame] | 2342 | if (req->task != rb->task) { |
Pavel Begunkov | 7c66073 | 2021-01-25 11:42:21 +0000 | [diff] [blame] | 2343 | if (rb->task) |
| 2344 | io_put_task(rb->task, rb->task_refs); |
Jens Axboe | e3bc8e9 | 2020-09-24 08:45:57 -0600 | [diff] [blame] | 2345 | rb->task = req->task; |
| 2346 | rb->task_refs = 0; |
Pavel Begunkov | 5af1d13 | 2020-07-18 11:32:52 +0300 | [diff] [blame] | 2347 | } |
Jens Axboe | e3bc8e9 | 2020-09-24 08:45:57 -0600 | [diff] [blame] | 2348 | rb->task_refs++; |
Pavel Begunkov | 9ae7246 | 2021-02-10 00:03:16 +0000 | [diff] [blame] | 2349 | rb->ctx_refs++; |
Pavel Begunkov | 5af1d13 | 2020-07-18 11:32:52 +0300 | [diff] [blame] | 2350 | |
Pavel Begunkov | bd75904 | 2021-02-12 03:23:50 +0000 | [diff] [blame] | 2351 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) |
Pavel Begunkov | 6ff119a | 2021-02-10 00:03:18 +0000 | [diff] [blame] | 2352 | state->reqs[state->free_reqs++] = req; |
Pavel Begunkov | bd75904 | 2021-02-12 03:23:50 +0000 | [diff] [blame] | 2353 | else |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 2354 | list_add(&req->inflight_entry, &state->free_list); |
Pavel Begunkov | 7a743e2 | 2020-03-03 21:33:13 +0300 | [diff] [blame] | 2355 | } |
| 2356 | |
Pavel Begunkov | 2a2758f | 2021-06-17 18:14:00 +0100 | [diff] [blame] | 2357 | static void io_submit_flush_completions(struct io_ring_ctx *ctx) |
Jens Axboe | a141dd8 | 2021-08-12 12:48:34 -0600 | [diff] [blame] | 2358 | __must_hold(&ctx->uring_lock) |
Pavel Begunkov | 905c172 | 2021-02-10 00:03:14 +0000 | [diff] [blame] | 2359 | { |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 2360 | struct io_submit_state *state = &ctx->submit_state; |
| 2361 | int i, nr = state->compl_nr; |
Pavel Begunkov | 905c172 | 2021-02-10 00:03:14 +0000 | [diff] [blame] | 2362 | struct req_batch rb; |
| 2363 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 2364 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | 905c172 | 2021-02-10 00:03:14 +0000 | [diff] [blame] | 2365 | for (i = 0; i < nr; i++) { |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 2366 | struct io_kiocb *req = state->compl_reqs[i]; |
Pavel Begunkov | 5182ed2 | 2021-06-26 21:40:48 +0100 | [diff] [blame] | 2367 | |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 2368 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
| 2369 | req->compl.cflags); |
Pavel Begunkov | 905c172 | 2021-02-10 00:03:14 +0000 | [diff] [blame] | 2370 | } |
| 2371 | io_commit_cqring(ctx); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 2372 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | 905c172 | 2021-02-10 00:03:14 +0000 | [diff] [blame] | 2373 | io_cqring_ev_posted(ctx); |
Pavel Begunkov | 5182ed2 | 2021-06-26 21:40:48 +0100 | [diff] [blame] | 2374 | |
| 2375 | io_init_req_batch(&rb); |
Pavel Begunkov | 905c172 | 2021-02-10 00:03:14 +0000 | [diff] [blame] | 2376 | for (i = 0; i < nr; i++) { |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 2377 | struct io_kiocb *req = state->compl_reqs[i]; |
Pavel Begunkov | 905c172 | 2021-02-10 00:03:14 +0000 | [diff] [blame] | 2378 | |
Pavel Begunkov | 91c2f69 | 2021-08-11 19:28:28 +0100 | [diff] [blame] | 2379 | if (req_ref_put_and_test(req)) |
Pavel Begunkov | 6ff119a | 2021-02-10 00:03:18 +0000 | [diff] [blame] | 2380 | io_req_free_batch(&rb, req, &ctx->submit_state); |
Pavel Begunkov | 905c172 | 2021-02-10 00:03:14 +0000 | [diff] [blame] | 2381 | } |
| 2382 | |
| 2383 | io_req_free_batch_finish(ctx, &rb); |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 2384 | state->compl_nr = 0; |
Jens Axboe | e65ef56 | 2019-03-12 10:16:44 -0600 | [diff] [blame] | 2385 | } |
| 2386 | |
Jens Axboe | ba816ad | 2019-09-28 11:36:45 -0600 | [diff] [blame] | 2387 | /* |
| 2388 | * Drop reference to request, return next in chain (if there is one) if this |
| 2389 | * was the last reference to this request. |
| 2390 | */ |
Pavel Begunkov | 0d85035 | 2021-03-19 17:22:37 +0000 | [diff] [blame] | 2391 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
Jens Axboe | e65ef56 | 2019-03-12 10:16:44 -0600 | [diff] [blame] | 2392 | { |
Pavel Begunkov | 9b5f7bd9 | 2020-06-29 13:13:00 +0300 | [diff] [blame] | 2393 | struct io_kiocb *nxt = NULL; |
| 2394 | |
Jens Axboe | de9b4cc | 2021-02-24 13:28:27 -0700 | [diff] [blame] | 2395 | if (req_ref_put_and_test(req)) { |
Pavel Begunkov | 9b5f7bd9 | 2020-06-29 13:13:00 +0300 | [diff] [blame] | 2396 | nxt = io_req_find_next(req); |
Jens Axboe | 4d7dd46 | 2019-11-20 13:03:52 -0700 | [diff] [blame] | 2397 | __io_free_req(req); |
Jens Axboe | 2a44f46 | 2020-02-25 13:25:41 -0700 | [diff] [blame] | 2398 | } |
Pavel Begunkov | 9b5f7bd9 | 2020-06-29 13:13:00 +0300 | [diff] [blame] | 2399 | return nxt; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2400 | } |
| 2401 | |
Pavel Begunkov | 0d85035 | 2021-03-19 17:22:37 +0000 | [diff] [blame] | 2402 | static inline void io_put_req(struct io_kiocb *req) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2403 | { |
Jens Axboe | de9b4cc | 2021-02-24 13:28:27 -0700 | [diff] [blame] | 2404 | if (req_ref_put_and_test(req)) |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2405 | io_free_req(req); |
| 2406 | } |
| 2407 | |
Pavel Begunkov | 91c2f69 | 2021-08-11 19:28:28 +0100 | [diff] [blame] | 2408 | static inline void io_put_req_deferred(struct io_kiocb *req) |
Pavel Begunkov | 216578e | 2020-10-13 09:44:00 +0100 | [diff] [blame] | 2409 | { |
Pavel Begunkov | 91c2f69 | 2021-08-11 19:28:28 +0100 | [diff] [blame] | 2410 | if (req_ref_put_and_test(req)) { |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2411 | req->io_task_work.func = io_free_req_work; |
Pavel Begunkov | 543af3a | 2021-08-09 13:04:15 +0100 | [diff] [blame] | 2412 | io_req_task_work_add(req); |
| 2413 | } |
Pavel Begunkov | 216578e | 2020-10-13 09:44:00 +0100 | [diff] [blame] | 2414 | } |
| 2415 | |
Pavel Begunkov | 6c50315 | 2021-01-04 20:36:36 +0000 | [diff] [blame] | 2416 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
Jens Axboe | a3a0e43 | 2019-08-20 11:03:11 -0600 | [diff] [blame] | 2417 | { |
| 2418 | /* See comment at the top of this file */ |
| 2419 | smp_rmb(); |
Pavel Begunkov | e23de15 | 2020-12-17 00:24:37 +0000 | [diff] [blame] | 2420 | return __io_cqring_events(ctx); |
Jens Axboe | a3a0e43 | 2019-08-20 11:03:11 -0600 | [diff] [blame] | 2421 | } |
| 2422 | |
Pavel Begunkov | fb5ccc9 | 2019-10-25 12:31:30 +0300 | [diff] [blame] | 2423 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
| 2424 | { |
| 2425 | struct io_rings *rings = ctx->rings; |
| 2426 | |
| 2427 | /* make sure SQ entry isn't read before tail */ |
| 2428 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; |
| 2429 | } |
| 2430 | |
Pavel Begunkov | 8ff069b | 2020-07-16 23:28:04 +0300 | [diff] [blame] | 2431 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
Jens Axboe | e94f141 | 2019-12-19 12:06:02 -0700 | [diff] [blame] | 2432 | { |
Pavel Begunkov | 8ff069b | 2020-07-16 23:28:04 +0300 | [diff] [blame] | 2433 | unsigned int cflags; |
Jens Axboe | e94f141 | 2019-12-19 12:06:02 -0700 | [diff] [blame] | 2434 | |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 2435 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
| 2436 | cflags |= IORING_CQE_F_BUFFER; |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 2437 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 2438 | kfree(kbuf); |
| 2439 | return cflags; |
| 2440 | } |
| 2441 | |
Pavel Begunkov | 8ff069b | 2020-07-16 23:28:04 +0300 | [diff] [blame] | 2442 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
| 2443 | { |
| 2444 | struct io_buffer *kbuf; |
| 2445 | |
Pavel Begunkov | ae421d9 | 2021-08-17 20:28:08 +0100 | [diff] [blame] | 2446 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) |
| 2447 | return 0; |
Pavel Begunkov | 8ff069b | 2020-07-16 23:28:04 +0300 | [diff] [blame] | 2448 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
| 2449 | return io_put_kbuf(req, kbuf); |
| 2450 | } |
| 2451 | |
Jens Axboe | 4c6e277 | 2020-07-01 11:29:10 -0600 | [diff] [blame] | 2452 | static inline bool io_run_task_work(void) |
| 2453 | { |
Nadav Amit | ef98eb0 | 2021-08-07 17:13:41 -0700 | [diff] [blame] | 2454 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
Jens Axboe | 4c6e277 | 2020-07-01 11:29:10 -0600 | [diff] [blame] | 2455 | __set_current_state(TASK_RUNNING); |
Nadav Amit | ef98eb0 | 2021-08-07 17:13:41 -0700 | [diff] [blame] | 2456 | tracehook_notify_signal(); |
Jens Axboe | 4c6e277 | 2020-07-01 11:29:10 -0600 | [diff] [blame] | 2457 | return true; |
| 2458 | } |
| 2459 | |
| 2460 | return false; |
| 2461 | } |
| 2462 | |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2463 | /* |
| 2464 | * Find and free completed poll iocbs |
| 2465 | */ |
| 2466 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, |
Pavel Begunkov | a8576af | 2021-08-15 10:40:21 +0100 | [diff] [blame] | 2467 | struct list_head *done) |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2468 | { |
Jens Axboe | 8237e04 | 2019-12-28 10:48:22 -0700 | [diff] [blame] | 2469 | struct req_batch rb; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2470 | struct io_kiocb *req; |
Xiaoguang Wang | bbde017 | 2020-06-16 02:06:38 +0800 | [diff] [blame] | 2471 | |
| 2472 | /* order with ->result store in io_complete_rw_iopoll() */ |
| 2473 | smp_rmb(); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2474 | |
Pavel Begunkov | 5af1d13 | 2020-07-18 11:32:52 +0300 | [diff] [blame] | 2475 | io_init_req_batch(&rb); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2476 | while (!list_empty(done)) { |
Pavel Begunkov | d21ffe7 | 2020-07-13 23:37:10 +0300 | [diff] [blame] | 2477 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
Pavel Begunkov | d21ffe7 | 2020-07-13 23:37:10 +0300 | [diff] [blame] | 2478 | list_del(&req->inflight_entry); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2479 | |
Pavel Begunkov | a8576af | 2021-08-15 10:40:21 +0100 | [diff] [blame] | 2480 | if (READ_ONCE(req->result) == -EAGAIN && |
Pavel Begunkov | 8c13082 | 2021-03-22 01:58:32 +0000 | [diff] [blame] | 2481 | !(req->flags & REQ_F_DONT_REISSUE)) { |
Pavel Begunkov | f161340 | 2021-02-11 18:28:21 +0000 | [diff] [blame] | 2482 | req->iopoll_completed = 0; |
Jens Axboe | 773af69 | 2021-07-27 10:25:55 -0600 | [diff] [blame] | 2483 | io_req_task_queue_reissue(req); |
Pavel Begunkov | 8c13082 | 2021-03-22 01:58:32 +0000 | [diff] [blame] | 2484 | continue; |
Pavel Begunkov | f161340 | 2021-02-11 18:28:21 +0000 | [diff] [blame] | 2485 | } |
| 2486 | |
Pavel Begunkov | ae421d9 | 2021-08-17 20:28:08 +0100 | [diff] [blame] | 2487 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
| 2488 | io_put_rw_kbuf(req)); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2489 | (*nr_events)++; |
| 2490 | |
Jens Axboe | de9b4cc | 2021-02-24 13:28:27 -0700 | [diff] [blame] | 2491 | if (req_ref_put_and_test(req)) |
Pavel Begunkov | 6ff119a | 2021-02-10 00:03:18 +0000 | [diff] [blame] | 2492 | io_req_free_batch(&rb, req, &ctx->submit_state); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2493 | } |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2494 | |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 2495 | io_commit_cqring(ctx); |
Pavel Begunkov | 80c18e4 | 2021-01-07 03:15:41 +0000 | [diff] [blame] | 2496 | io_cqring_ev_posted_iopoll(ctx); |
Pavel Begunkov | 2d6500d | 2020-06-28 12:52:33 +0300 | [diff] [blame] | 2497 | io_req_free_batch_finish(ctx, &rb); |
Bijan Mottahedeh | 581f981 | 2020-04-03 13:51:33 -0700 | [diff] [blame] | 2498 | } |
| 2499 | |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2500 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
Pavel Begunkov | a8576af | 2021-08-15 10:40:21 +0100 | [diff] [blame] | 2501 | long min) |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2502 | { |
| 2503 | struct io_kiocb *req, *tmp; |
| 2504 | LIST_HEAD(done); |
| 2505 | bool spin; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2506 | |
| 2507 | /* |
| 2508 | * Only spin for completions if we don't have multiple devices hanging |
| 2509 | * off our complete list, and we're under the requested amount. |
| 2510 | */ |
Hao Xu | 915b3dd | 2021-06-28 05:37:30 +0800 | [diff] [blame] | 2511 | spin = !ctx->poll_multi_queue && *nr_events < min; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2512 | |
Pavel Begunkov | d21ffe7 | 2020-07-13 23:37:10 +0300 | [diff] [blame] | 2513 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 2514 | struct kiocb *kiocb = &req->rw.kiocb; |
Pavel Begunkov | a2416e1 | 2021-08-09 13:04:09 +0100 | [diff] [blame] | 2515 | int ret; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2516 | |
| 2517 | /* |
Bijan Mottahedeh | 581f981 | 2020-04-03 13:51:33 -0700 | [diff] [blame] | 2518 | * Move completed and retryable entries to our local lists. |
| 2519 | * If we find a request that requires polling, break out |
| 2520 | * and complete those lists first, if we have entries there. |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2521 | */ |
Xiaoguang Wang | 65a6543 | 2020-06-11 23:39:36 +0800 | [diff] [blame] | 2522 | if (READ_ONCE(req->iopoll_completed)) { |
Pavel Begunkov | d21ffe7 | 2020-07-13 23:37:10 +0300 | [diff] [blame] | 2523 | list_move_tail(&req->inflight_entry, &done); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2524 | continue; |
| 2525 | } |
| 2526 | if (!list_empty(&done)) |
| 2527 | break; |
| 2528 | |
| 2529 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); |
Pavel Begunkov | a2416e1 | 2021-08-09 13:04:09 +0100 | [diff] [blame] | 2530 | if (unlikely(ret < 0)) |
| 2531 | return ret; |
| 2532 | else if (ret) |
| 2533 | spin = false; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2534 | |
Pavel Begunkov | 3aadc23 | 2020-07-06 17:59:29 +0300 | [diff] [blame] | 2535 | /* iopoll may have completed current req */ |
| 2536 | if (READ_ONCE(req->iopoll_completed)) |
Pavel Begunkov | d21ffe7 | 2020-07-13 23:37:10 +0300 | [diff] [blame] | 2537 | list_move_tail(&req->inflight_entry, &done); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2538 | } |
| 2539 | |
| 2540 | if (!list_empty(&done)) |
Pavel Begunkov | a8576af | 2021-08-15 10:40:21 +0100 | [diff] [blame] | 2541 | io_iopoll_complete(ctx, nr_events, &done); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2542 | |
Pavel Begunkov | a2416e1 | 2021-08-09 13:04:09 +0100 | [diff] [blame] | 2543 | return 0; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2544 | } |
| 2545 | |
| 2546 | /* |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2547 | * We can't just wait for polled events to come to us, we have to actively |
| 2548 | * find and complete them. |
| 2549 | */ |
Pavel Begunkov | b2edc0a | 2020-07-07 16:36:22 +0300 | [diff] [blame] | 2550 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2551 | { |
| 2552 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) |
| 2553 | return; |
| 2554 | |
| 2555 | mutex_lock(&ctx->uring_lock); |
Pavel Begunkov | 540e32a | 2020-07-13 23:37:09 +0300 | [diff] [blame] | 2556 | while (!list_empty(&ctx->iopoll_list)) { |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2557 | unsigned int nr_events = 0; |
| 2558 | |
Pavel Begunkov | a8576af | 2021-08-15 10:40:21 +0100 | [diff] [blame] | 2559 | io_do_iopoll(ctx, &nr_events, 0); |
Jens Axboe | 08f5439 | 2019-08-21 22:19:11 -0600 | [diff] [blame] | 2560 | |
Pavel Begunkov | b2edc0a | 2020-07-07 16:36:22 +0300 | [diff] [blame] | 2561 | /* let it sleep and repeat later if can't complete a request */ |
| 2562 | if (nr_events == 0) |
| 2563 | break; |
Jens Axboe | 08f5439 | 2019-08-21 22:19:11 -0600 | [diff] [blame] | 2564 | /* |
| 2565 | * Ensure we allow local-to-the-cpu processing to take place, |
| 2566 | * in this case we need to ensure that we reap all events. |
Pavel Begunkov | 3fcee5a | 2020-07-06 17:59:31 +0300 | [diff] [blame] | 2567 | * Also let task_work, etc. to progress by releasing the mutex |
Jens Axboe | 08f5439 | 2019-08-21 22:19:11 -0600 | [diff] [blame] | 2568 | */ |
Pavel Begunkov | 3fcee5a | 2020-07-06 17:59:31 +0300 | [diff] [blame] | 2569 | if (need_resched()) { |
| 2570 | mutex_unlock(&ctx->uring_lock); |
| 2571 | cond_resched(); |
| 2572 | mutex_lock(&ctx->uring_lock); |
| 2573 | } |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2574 | } |
| 2575 | mutex_unlock(&ctx->uring_lock); |
| 2576 | } |
| 2577 | |
Pavel Begunkov | 7668b92 | 2020-07-07 16:36:21 +0300 | [diff] [blame] | 2578 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2579 | { |
Pavel Begunkov | 7668b92 | 2020-07-07 16:36:21 +0300 | [diff] [blame] | 2580 | unsigned int nr_events = 0; |
Pavel Begunkov | e9979b3 | 2021-04-13 02:58:45 +0100 | [diff] [blame] | 2581 | int ret = 0; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2582 | |
Xiaoguang Wang | c7849be | 2020-02-22 14:46:05 +0800 | [diff] [blame] | 2583 | /* |
| 2584 | * We disallow the app entering submit/complete with polling, but we |
| 2585 | * still need to lock the ring to prevent racing with polled issue |
| 2586 | * that got punted to a workqueue. |
| 2587 | */ |
| 2588 | mutex_lock(&ctx->uring_lock); |
Pavel Begunkov | f39c8a5 | 2021-04-13 02:58:46 +0100 | [diff] [blame] | 2589 | /* |
| 2590 | * Don't enter poll loop if we already have events pending. |
| 2591 | * If we do, we can potentially be spinning for commands that |
| 2592 | * already triggered a CQE (eg in error). |
| 2593 | */ |
Pavel Begunkov | 5ed7a37 | 2021-06-14 23:37:27 +0100 | [diff] [blame] | 2594 | if (test_bit(0, &ctx->check_cq_overflow)) |
Pavel Begunkov | f39c8a5 | 2021-04-13 02:58:46 +0100 | [diff] [blame] | 2595 | __io_cqring_overflow_flush(ctx, false); |
| 2596 | if (io_cqring_events(ctx)) |
| 2597 | goto out; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2598 | do { |
Jens Axboe | 500f9fb | 2019-08-19 12:15:59 -0600 | [diff] [blame] | 2599 | /* |
| 2600 | * If a submit got punted to a workqueue, we can have the |
| 2601 | * application entering polling for a command before it gets |
| 2602 | * issued. That app will hold the uring_lock for the duration |
| 2603 | * of the poll right here, so we need to take a breather every |
| 2604 | * now and then to ensure that the issue has a chance to add |
| 2605 | * the poll to the issued list. Otherwise we can spin here |
| 2606 | * forever, while the workqueue is stuck trying to acquire the |
| 2607 | * very same mutex. |
| 2608 | */ |
Pavel Begunkov | e9979b3 | 2021-04-13 02:58:45 +0100 | [diff] [blame] | 2609 | if (list_empty(&ctx->iopoll_list)) { |
Pavel Begunkov | 8f487ef | 2021-07-08 13:37:06 +0100 | [diff] [blame] | 2610 | u32 tail = ctx->cached_cq_tail; |
| 2611 | |
Jens Axboe | 500f9fb | 2019-08-19 12:15:59 -0600 | [diff] [blame] | 2612 | mutex_unlock(&ctx->uring_lock); |
Jens Axboe | 4c6e277 | 2020-07-01 11:29:10 -0600 | [diff] [blame] | 2613 | io_run_task_work(); |
Jens Axboe | 500f9fb | 2019-08-19 12:15:59 -0600 | [diff] [blame] | 2614 | mutex_lock(&ctx->uring_lock); |
Pavel Begunkov | e9979b3 | 2021-04-13 02:58:45 +0100 | [diff] [blame] | 2615 | |
Pavel Begunkov | 8f487ef | 2021-07-08 13:37:06 +0100 | [diff] [blame] | 2616 | /* some requests don't go through iopoll_list */ |
| 2617 | if (tail != ctx->cached_cq_tail || |
| 2618 | list_empty(&ctx->iopoll_list)) |
Pavel Begunkov | e9979b3 | 2021-04-13 02:58:45 +0100 | [diff] [blame] | 2619 | break; |
Jens Axboe | 500f9fb | 2019-08-19 12:15:59 -0600 | [diff] [blame] | 2620 | } |
Pavel Begunkov | a8576af | 2021-08-15 10:40:21 +0100 | [diff] [blame] | 2621 | ret = io_do_iopoll(ctx, &nr_events, min); |
Pavel Begunkov | f39c8a5 | 2021-04-13 02:58:46 +0100 | [diff] [blame] | 2622 | } while (!ret && nr_events < min && !need_resched()); |
| 2623 | out: |
Jens Axboe | 500f9fb | 2019-08-19 12:15:59 -0600 | [diff] [blame] | 2624 | mutex_unlock(&ctx->uring_lock); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2625 | return ret; |
| 2626 | } |
| 2627 | |
Jens Axboe | 491381ce | 2019-10-17 09:20:46 -0600 | [diff] [blame] | 2628 | static void kiocb_end_write(struct io_kiocb *req) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2629 | { |
Jens Axboe | 491381ce | 2019-10-17 09:20:46 -0600 | [diff] [blame] | 2630 | /* |
| 2631 | * Tell lockdep we inherited freeze protection from submission |
| 2632 | * thread. |
| 2633 | */ |
| 2634 | if (req->flags & REQ_F_ISREG) { |
Pavel Begunkov | 1c98679 | 2021-03-22 01:58:31 +0000 | [diff] [blame] | 2635 | struct super_block *sb = file_inode(req->file)->i_sb; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2636 | |
Pavel Begunkov | 1c98679 | 2021-03-22 01:58:31 +0000 | [diff] [blame] | 2637 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
| 2638 | sb_end_write(sb); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2639 | } |
| 2640 | } |
| 2641 | |
Jens Axboe | b63534c | 2020-06-04 11:28:00 -0600 | [diff] [blame] | 2642 | #ifdef CONFIG_BLOCK |
Pavel Begunkov | dc2a6e9 | 2021-01-19 13:32:35 +0000 | [diff] [blame] | 2643 | static bool io_resubmit_prep(struct io_kiocb *req) |
Jens Axboe | b63534c | 2020-06-04 11:28:00 -0600 | [diff] [blame] | 2644 | { |
Pavel Begunkov | ab45443 | 2021-03-22 01:58:33 +0000 | [diff] [blame] | 2645 | struct io_async_rw *rw = req->async_data; |
Jens Axboe | b63534c | 2020-06-04 11:28:00 -0600 | [diff] [blame] | 2646 | |
Pavel Begunkov | ab45443 | 2021-03-22 01:58:33 +0000 | [diff] [blame] | 2647 | if (!rw) |
| 2648 | return !io_req_prep_async(req); |
| 2649 | /* may have left rw->iter inconsistent on -EIOCBQUEUED */ |
| 2650 | iov_iter_revert(&rw->iter, req->result - iov_iter_count(&rw->iter)); |
| 2651 | return true; |
Jens Axboe | b63534c | 2020-06-04 11:28:00 -0600 | [diff] [blame] | 2652 | } |
Jens Axboe | b63534c | 2020-06-04 11:28:00 -0600 | [diff] [blame] | 2653 | |
Jens Axboe | 3e6a0d3 | 2021-03-01 13:56:00 -0700 | [diff] [blame] | 2654 | static bool io_rw_should_reissue(struct io_kiocb *req) |
Jens Axboe | b63534c | 2020-06-04 11:28:00 -0600 | [diff] [blame] | 2655 | { |
Jens Axboe | 355afae | 2020-09-02 09:30:31 -0600 | [diff] [blame] | 2656 | umode_t mode = file_inode(req->file)->i_mode; |
Jens Axboe | 3e6a0d3 | 2021-03-01 13:56:00 -0700 | [diff] [blame] | 2657 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | b63534c | 2020-06-04 11:28:00 -0600 | [diff] [blame] | 2658 | |
Jens Axboe | 355afae | 2020-09-02 09:30:31 -0600 | [diff] [blame] | 2659 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
| 2660 | return false; |
Jens Axboe | 3e6a0d3 | 2021-03-01 13:56:00 -0700 | [diff] [blame] | 2661 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
| 2662 | !(ctx->flags & IORING_SETUP_IOPOLL))) |
Jens Axboe | b63534c | 2020-06-04 11:28:00 -0600 | [diff] [blame] | 2663 | return false; |
Jens Axboe | 7c977a5 | 2021-02-23 19:17:35 -0700 | [diff] [blame] | 2664 | /* |
| 2665 | * If ref is dying, we might be running poll reap from the exit work. |
| 2666 | * Don't attempt to reissue from that path, just let it fail with |
| 2667 | * -EAGAIN. |
| 2668 | */ |
Jens Axboe | 3e6a0d3 | 2021-03-01 13:56:00 -0700 | [diff] [blame] | 2669 | if (percpu_ref_is_dying(&ctx->refs)) |
| 2670 | return false; |
Jens Axboe | ef04688 | 2021-07-27 10:50:31 -0600 | [diff] [blame] | 2671 | /* |
| 2672 | * Play it safe and assume not safe to re-import and reissue if we're |
| 2673 | * not in the original thread group (or in task context). |
| 2674 | */ |
| 2675 | if (!same_thread_group(req->task, current) || !in_task()) |
| 2676 | return false; |
Jens Axboe | 3e6a0d3 | 2021-03-01 13:56:00 -0700 | [diff] [blame] | 2677 | return true; |
| 2678 | } |
Jens Axboe | e82ad48 | 2021-04-02 19:45:34 -0600 | [diff] [blame] | 2679 | #else |
Jens Axboe | a1ff1e3 | 2021-04-12 06:40:02 -0600 | [diff] [blame] | 2680 | static bool io_resubmit_prep(struct io_kiocb *req) |
| 2681 | { |
| 2682 | return false; |
| 2683 | } |
Jens Axboe | e82ad48 | 2021-04-02 19:45:34 -0600 | [diff] [blame] | 2684 | static bool io_rw_should_reissue(struct io_kiocb *req) |
| 2685 | { |
| 2686 | return false; |
| 2687 | } |
Jens Axboe | 3e6a0d3 | 2021-03-01 13:56:00 -0700 | [diff] [blame] | 2688 | #endif |
| 2689 | |
Jens Axboe | 8ef12ef | 2021-08-10 15:15:25 -0600 | [diff] [blame] | 2690 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
Jens Axboe | a1d7c39 | 2020-06-22 11:09:46 -0600 | [diff] [blame] | 2691 | { |
Pavel Begunkov | b65c128 | 2021-03-22 01:45:59 +0000 | [diff] [blame] | 2692 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
| 2693 | kiocb_end_write(req); |
Pavel Begunkov | 9532b99 | 2021-03-22 01:58:34 +0000 | [diff] [blame] | 2694 | if (res != req->result) { |
| 2695 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && |
| 2696 | io_rw_should_reissue(req)) { |
| 2697 | req->flags |= REQ_F_REISSUE; |
Jens Axboe | 8ef12ef | 2021-08-10 15:15:25 -0600 | [diff] [blame] | 2698 | return true; |
Pavel Begunkov | 9532b99 | 2021-03-22 01:58:34 +0000 | [diff] [blame] | 2699 | } |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 2700 | req_set_fail(req); |
Jens Axboe | 8ef12ef | 2021-08-10 15:15:25 -0600 | [diff] [blame] | 2701 | req->result = res; |
Pavel Begunkov | 9532b99 | 2021-03-22 01:58:34 +0000 | [diff] [blame] | 2702 | } |
Jens Axboe | 8ef12ef | 2021-08-10 15:15:25 -0600 | [diff] [blame] | 2703 | return false; |
| 2704 | } |
| 2705 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 2706 | static void io_req_task_complete(struct io_kiocb *req, bool *locked) |
Jens Axboe | 8ef12ef | 2021-08-10 15:15:25 -0600 | [diff] [blame] | 2707 | { |
Pavel Begunkov | 126180b | 2021-08-18 12:42:47 +0100 | [diff] [blame] | 2708 | unsigned int cflags = io_put_rw_kbuf(req); |
| 2709 | long res = req->result; |
| 2710 | |
| 2711 | if (*locked) { |
| 2712 | struct io_ring_ctx *ctx = req->ctx; |
| 2713 | struct io_submit_state *state = &ctx->submit_state; |
| 2714 | |
| 2715 | io_req_complete_state(req, res, cflags); |
| 2716 | state->compl_reqs[state->compl_nr++] = req; |
| 2717 | if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) |
| 2718 | io_submit_flush_completions(ctx); |
| 2719 | } else { |
| 2720 | io_req_complete_post(req, res, cflags); |
| 2721 | } |
Jens Axboe | 8ef12ef | 2021-08-10 15:15:25 -0600 | [diff] [blame] | 2722 | } |
| 2723 | |
| 2724 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
| 2725 | unsigned int issue_flags) |
| 2726 | { |
| 2727 | if (__io_complete_rw_common(req, res)) |
| 2728 | return; |
Pavel Begunkov | 6363785 | 2021-09-02 00:38:22 +0100 | [diff] [blame] | 2729 | __io_req_complete(req, issue_flags, req->result, io_put_rw_kbuf(req)); |
Jens Axboe | ba816ad | 2019-09-28 11:36:45 -0600 | [diff] [blame] | 2730 | } |
| 2731 | |
| 2732 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) |
| 2733 | { |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 2734 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
Jens Axboe | ba816ad | 2019-09-28 11:36:45 -0600 | [diff] [blame] | 2735 | |
Jens Axboe | 8ef12ef | 2021-08-10 15:15:25 -0600 | [diff] [blame] | 2736 | if (__io_complete_rw_common(req, res)) |
| 2737 | return; |
| 2738 | req->result = res; |
| 2739 | req->io_task_work.func = io_req_task_complete; |
| 2740 | io_req_task_work_add(req); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2741 | } |
| 2742 | |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2743 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
| 2744 | { |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 2745 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2746 | |
Jens Axboe | 491381ce | 2019-10-17 09:20:46 -0600 | [diff] [blame] | 2747 | if (kiocb->ki_flags & IOCB_WRITE) |
| 2748 | kiocb_end_write(req); |
Pavel Begunkov | 9532b99 | 2021-03-22 01:58:34 +0000 | [diff] [blame] | 2749 | if (unlikely(res != req->result)) { |
Jens Axboe | a1ff1e3 | 2021-04-12 06:40:02 -0600 | [diff] [blame] | 2750 | if (!(res == -EAGAIN && io_rw_should_reissue(req) && |
| 2751 | io_resubmit_prep(req))) { |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 2752 | req_set_fail(req); |
Pavel Begunkov | 9532b99 | 2021-03-22 01:58:34 +0000 | [diff] [blame] | 2753 | req->flags |= REQ_F_DONT_REISSUE; |
| 2754 | } |
Pavel Begunkov | 8c13082 | 2021-03-22 01:58:32 +0000 | [diff] [blame] | 2755 | } |
Xiaoguang Wang | bbde017 | 2020-06-16 02:06:38 +0800 | [diff] [blame] | 2756 | |
| 2757 | WRITE_ONCE(req->result, res); |
Jens Axboe | b9b0e0d | 2021-02-23 08:18:36 -0700 | [diff] [blame] | 2758 | /* order with io_iopoll_complete() checking ->result */ |
Pavel Begunkov | cd664b0 | 2020-06-25 12:37:10 +0300 | [diff] [blame] | 2759 | smp_wmb(); |
| 2760 | WRITE_ONCE(req->iopoll_completed, 1); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2761 | } |
| 2762 | |
| 2763 | /* |
| 2764 | * After the iocb has been issued, it's safe to be found on the poll list. |
| 2765 | * Adding the kiocb to the list AFTER submission ensures that we don't |
Pavel Begunkov | f39c8a5 | 2021-04-13 02:58:46 +0100 | [diff] [blame] | 2766 | * find it from a io_do_iopoll() thread before the issuer is done |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2767 | * accessing the kiocb cookie. |
| 2768 | */ |
Pavel Begunkov | cb3d897 | 2021-06-14 02:36:14 +0100 | [diff] [blame] | 2769 | static void io_iopoll_req_issued(struct io_kiocb *req) |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2770 | { |
| 2771 | struct io_ring_ctx *ctx = req->ctx; |
Pavel Begunkov | cb3d897 | 2021-06-14 02:36:14 +0100 | [diff] [blame] | 2772 | const bool in_async = io_wq_current_is_worker(); |
| 2773 | |
| 2774 | /* workqueue context doesn't hold uring_lock, grab it now */ |
| 2775 | if (unlikely(in_async)) |
| 2776 | mutex_lock(&ctx->uring_lock); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2777 | |
| 2778 | /* |
| 2779 | * Track whether we have multiple files in our lists. This will impact |
| 2780 | * how we do polling eventually, not spinning if we're on potentially |
| 2781 | * different devices. |
| 2782 | */ |
Pavel Begunkov | 540e32a | 2020-07-13 23:37:09 +0300 | [diff] [blame] | 2783 | if (list_empty(&ctx->iopoll_list)) { |
Hao Xu | 915b3dd | 2021-06-28 05:37:30 +0800 | [diff] [blame] | 2784 | ctx->poll_multi_queue = false; |
| 2785 | } else if (!ctx->poll_multi_queue) { |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2786 | struct io_kiocb *list_req; |
Hao Xu | 915b3dd | 2021-06-28 05:37:30 +0800 | [diff] [blame] | 2787 | unsigned int queue_num0, queue_num1; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2788 | |
Pavel Begunkov | 540e32a | 2020-07-13 23:37:09 +0300 | [diff] [blame] | 2789 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
Pavel Begunkov | d21ffe7 | 2020-07-13 23:37:10 +0300 | [diff] [blame] | 2790 | inflight_entry); |
Hao Xu | 915b3dd | 2021-06-28 05:37:30 +0800 | [diff] [blame] | 2791 | |
| 2792 | if (list_req->file != req->file) { |
| 2793 | ctx->poll_multi_queue = true; |
| 2794 | } else { |
| 2795 | queue_num0 = blk_qc_t_to_queue_num(list_req->rw.kiocb.ki_cookie); |
| 2796 | queue_num1 = blk_qc_t_to_queue_num(req->rw.kiocb.ki_cookie); |
| 2797 | if (queue_num0 != queue_num1) |
| 2798 | ctx->poll_multi_queue = true; |
| 2799 | } |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2800 | } |
| 2801 | |
| 2802 | /* |
| 2803 | * For fast devices, IO may have already completed. If it has, add |
| 2804 | * it to the front so we find it first. |
| 2805 | */ |
Xiaoguang Wang | 65a6543 | 2020-06-11 23:39:36 +0800 | [diff] [blame] | 2806 | if (READ_ONCE(req->iopoll_completed)) |
Pavel Begunkov | d21ffe7 | 2020-07-13 23:37:10 +0300 | [diff] [blame] | 2807 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2808 | else |
Pavel Begunkov | d21ffe7 | 2020-07-13 23:37:10 +0300 | [diff] [blame] | 2809 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
Xiaoguang Wang | bdcd3ea | 2020-02-25 22:12:08 +0800 | [diff] [blame] | 2810 | |
Pavel Begunkov | cb3d897 | 2021-06-14 02:36:14 +0100 | [diff] [blame] | 2811 | if (unlikely(in_async)) { |
| 2812 | /* |
| 2813 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle |
| 2814 | * in sq thread task context or in io worker task context. If |
| 2815 | * current task context is sq thread, we don't need to check |
| 2816 | * whether should wake up sq thread. |
| 2817 | */ |
| 2818 | if ((ctx->flags & IORING_SETUP_SQPOLL) && |
| 2819 | wq_has_sleeper(&ctx->sq_data->wait)) |
| 2820 | wake_up(&ctx->sq_data->wait); |
| 2821 | |
| 2822 | mutex_unlock(&ctx->uring_lock); |
| 2823 | } |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2824 | } |
| 2825 | |
Jens Axboe | 4503b76 | 2020-06-01 10:00:27 -0600 | [diff] [blame] | 2826 | static bool io_bdev_nowait(struct block_device *bdev) |
| 2827 | { |
Jeffle Xu | 9ba0d0c | 2020-10-19 16:59:42 +0800 | [diff] [blame] | 2828 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
Jens Axboe | 4503b76 | 2020-06-01 10:00:27 -0600 | [diff] [blame] | 2829 | } |
| 2830 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2831 | /* |
| 2832 | * If we tracked the file through the SCM inflight mechanism, we could support |
| 2833 | * any file. For now, just ensure that anything potentially problematic is done |
| 2834 | * inline. |
| 2835 | */ |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 2836 | static bool __io_file_supports_nowait(struct file *file, int rw) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2837 | { |
| 2838 | umode_t mode = file_inode(file)->i_mode; |
| 2839 | |
Jens Axboe | 4503b76 | 2020-06-01 10:00:27 -0600 | [diff] [blame] | 2840 | if (S_ISBLK(mode)) { |
Christoph Hellwig | 4e7b567 | 2020-11-23 13:38:40 +0100 | [diff] [blame] | 2841 | if (IS_ENABLED(CONFIG_BLOCK) && |
| 2842 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) |
Jens Axboe | 4503b76 | 2020-06-01 10:00:27 -0600 | [diff] [blame] | 2843 | return true; |
| 2844 | return false; |
| 2845 | } |
Pavel Begunkov | 976517f | 2021-06-09 12:07:25 +0100 | [diff] [blame] | 2846 | if (S_ISSOCK(mode)) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2847 | return true; |
Jens Axboe | 4503b76 | 2020-06-01 10:00:27 -0600 | [diff] [blame] | 2848 | if (S_ISREG(mode)) { |
Christoph Hellwig | 4e7b567 | 2020-11-23 13:38:40 +0100 | [diff] [blame] | 2849 | if (IS_ENABLED(CONFIG_BLOCK) && |
| 2850 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && |
Jens Axboe | 4503b76 | 2020-06-01 10:00:27 -0600 | [diff] [blame] | 2851 | file->f_op != &io_uring_fops) |
| 2852 | return true; |
| 2853 | return false; |
| 2854 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2855 | |
Jens Axboe | c5b8562 | 2020-06-09 19:23:05 -0600 | [diff] [blame] | 2856 | /* any ->read/write should understand O_NONBLOCK */ |
| 2857 | if (file->f_flags & O_NONBLOCK) |
| 2858 | return true; |
| 2859 | |
Jens Axboe | af197f5 | 2020-04-28 13:15:06 -0600 | [diff] [blame] | 2860 | if (!(file->f_mode & FMODE_NOWAIT)) |
| 2861 | return false; |
| 2862 | |
| 2863 | if (rw == READ) |
| 2864 | return file->f_op->read_iter != NULL; |
| 2865 | |
| 2866 | return file->f_op->write_iter != NULL; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2867 | } |
| 2868 | |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 2869 | static bool io_file_supports_nowait(struct io_kiocb *req, int rw) |
Jens Axboe | 7b29f92 | 2021-03-12 08:30:14 -0700 | [diff] [blame] | 2870 | { |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 2871 | if (rw == READ && (req->flags & REQ_F_NOWAIT_READ)) |
Jens Axboe | 7b29f92 | 2021-03-12 08:30:14 -0700 | [diff] [blame] | 2872 | return true; |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 2873 | else if (rw == WRITE && (req->flags & REQ_F_NOWAIT_WRITE)) |
Jens Axboe | 7b29f92 | 2021-03-12 08:30:14 -0700 | [diff] [blame] | 2874 | return true; |
| 2875 | |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 2876 | return __io_file_supports_nowait(req->file, rw); |
Jens Axboe | 7b29f92 | 2021-03-12 08:30:14 -0700 | [diff] [blame] | 2877 | } |
| 2878 | |
Pavel Begunkov | a88fc40 | 2020-09-30 22:57:53 +0300 | [diff] [blame] | 2879 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2880 | { |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2881 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 2882 | struct kiocb *kiocb = &req->rw.kiocb; |
Pavel Begunkov | 75c668c | 2021-02-04 13:52:05 +0000 | [diff] [blame] | 2883 | struct file *file = req->file; |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 2884 | unsigned ioprio; |
| 2885 | int ret; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2886 | |
Pavel Begunkov | c97d8a0 | 2021-08-09 13:04:04 +0100 | [diff] [blame] | 2887 | if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode)) |
Jens Axboe | 491381ce | 2019-10-17 09:20:46 -0600 | [diff] [blame] | 2888 | req->flags |= REQ_F_ISREG; |
| 2889 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2890 | kiocb->ki_pos = READ_ONCE(sqe->off); |
Pavel Begunkov | 75c668c | 2021-02-04 13:52:05 +0000 | [diff] [blame] | 2891 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
Jens Axboe | ba04291 | 2019-12-25 16:33:42 -0700 | [diff] [blame] | 2892 | req->flags |= REQ_F_CUR_POS; |
Pavel Begunkov | 75c668c | 2021-02-04 13:52:05 +0000 | [diff] [blame] | 2893 | kiocb->ki_pos = file->f_pos; |
Jens Axboe | ba04291 | 2019-12-25 16:33:42 -0700 | [diff] [blame] | 2894 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2895 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
Pavel Begunkov | 3e577dc | 2020-02-01 03:58:42 +0300 | [diff] [blame] | 2896 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
| 2897 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); |
| 2898 | if (unlikely(ret)) |
| 2899 | return ret; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2900 | |
Pavel Begunkov | 75c668c | 2021-02-04 13:52:05 +0000 | [diff] [blame] | 2901 | /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */ |
| 2902 | if ((kiocb->ki_flags & IOCB_NOWAIT) || (file->f_flags & O_NONBLOCK)) |
| 2903 | req->flags |= REQ_F_NOWAIT; |
| 2904 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2905 | ioprio = READ_ONCE(sqe->ioprio); |
| 2906 | if (ioprio) { |
| 2907 | ret = ioprio_check_cap(ioprio); |
| 2908 | if (ret) |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 2909 | return ret; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2910 | |
| 2911 | kiocb->ki_ioprio = ioprio; |
| 2912 | } else |
| 2913 | kiocb->ki_ioprio = get_current_ioprio(); |
| 2914 | |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2915 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2916 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
| 2917 | !kiocb->ki_filp->f_op->iopoll) |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 2918 | return -EOPNOTSUPP; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2919 | |
Jens Axboe | 394918e | 2021-03-08 11:40:23 -0700 | [diff] [blame] | 2920 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2921 | kiocb->ki_complete = io_complete_rw_iopoll; |
Xiaoguang Wang | 65a6543 | 2020-06-11 23:39:36 +0800 | [diff] [blame] | 2922 | req->iopoll_completed = 0; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2923 | } else { |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 2924 | if (kiocb->ki_flags & IOCB_HIPRI) |
| 2925 | return -EINVAL; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 2926 | kiocb->ki_complete = io_complete_rw; |
| 2927 | } |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 2928 | |
Pavel Begunkov | eae071c | 2021-04-25 14:32:24 +0100 | [diff] [blame] | 2929 | if (req->opcode == IORING_OP_READ_FIXED || |
| 2930 | req->opcode == IORING_OP_WRITE_FIXED) { |
| 2931 | req->imu = NULL; |
| 2932 | io_req_set_rsrc_node(req); |
| 2933 | } |
| 2934 | |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 2935 | req->rw.addr = READ_ONCE(sqe->addr); |
| 2936 | req->rw.len = READ_ONCE(sqe->len); |
Bijan Mottahedeh | 4f4eeba | 2020-05-19 14:52:49 -0700 | [diff] [blame] | 2937 | req->buf_index = READ_ONCE(sqe->buf_index); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2938 | return 0; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2939 | } |
| 2940 | |
| 2941 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) |
| 2942 | { |
| 2943 | switch (ret) { |
| 2944 | case -EIOCBQUEUED: |
| 2945 | break; |
| 2946 | case -ERESTARTSYS: |
| 2947 | case -ERESTARTNOINTR: |
| 2948 | case -ERESTARTNOHAND: |
| 2949 | case -ERESTART_RESTARTBLOCK: |
| 2950 | /* |
| 2951 | * We can't just restart the syscall, since previously |
| 2952 | * submitted sqes may already be in progress. Just fail this |
| 2953 | * IO with EINTR. |
| 2954 | */ |
| 2955 | ret = -EINTR; |
Gustavo A. R. Silva | df561f66 | 2020-08-23 17:36:59 -0500 | [diff] [blame] | 2956 | fallthrough; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 2957 | default: |
| 2958 | kiocb->ki_complete(kiocb, ret, 0); |
| 2959 | } |
| 2960 | } |
| 2961 | |
Jens Axboe | a1d7c39 | 2020-06-22 11:09:46 -0600 | [diff] [blame] | 2962 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 2963 | unsigned int issue_flags) |
Jens Axboe | ba816ad | 2019-09-28 11:36:45 -0600 | [diff] [blame] | 2964 | { |
Jens Axboe | ba04291 | 2019-12-25 16:33:42 -0700 | [diff] [blame] | 2965 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 2966 | struct io_async_rw *io = req->async_data; |
Pavel Begunkov | 9728463 | 2021-04-08 19:28:03 +0100 | [diff] [blame] | 2967 | bool check_reissue = kiocb->ki_complete == io_complete_rw; |
Jens Axboe | ba04291 | 2019-12-25 16:33:42 -0700 | [diff] [blame] | 2968 | |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 2969 | /* add previously done IO, if any */ |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 2970 | if (io && io->bytes_done > 0) { |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 2971 | if (ret < 0) |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 2972 | ret = io->bytes_done; |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 2973 | else |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 2974 | ret += io->bytes_done; |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 2975 | } |
| 2976 | |
Jens Axboe | ba04291 | 2019-12-25 16:33:42 -0700 | [diff] [blame] | 2977 | if (req->flags & REQ_F_CUR_POS) |
| 2978 | req->file->f_pos = kiocb->ki_pos; |
Hao Xu | e149bd74 | 2021-06-28 05:48:05 +0800 | [diff] [blame] | 2979 | if (ret >= 0 && check_reissue) |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 2980 | __io_complete_rw(req, ret, 0, issue_flags); |
Jens Axboe | ba816ad | 2019-09-28 11:36:45 -0600 | [diff] [blame] | 2981 | else |
| 2982 | io_rw_done(kiocb, ret); |
Pavel Begunkov | 9728463 | 2021-04-08 19:28:03 +0100 | [diff] [blame] | 2983 | |
Pavel Begunkov | fe7e325 | 2021-06-24 15:09:57 +0100 | [diff] [blame] | 2984 | if (check_reissue && (req->flags & REQ_F_REISSUE)) { |
Pavel Begunkov | 9728463 | 2021-04-08 19:28:03 +0100 | [diff] [blame] | 2985 | req->flags &= ~REQ_F_REISSUE; |
Jens Axboe | a7be7c2 | 2021-04-15 11:31:14 -0600 | [diff] [blame] | 2986 | if (io_resubmit_prep(req)) { |
Jens Axboe | 773af69 | 2021-07-27 10:25:55 -0600 | [diff] [blame] | 2987 | io_req_task_queue_reissue(req); |
Pavel Begunkov | 8c13082 | 2021-03-22 01:58:32 +0000 | [diff] [blame] | 2988 | } else { |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 2989 | req_set_fail(req); |
Pavel Begunkov | ae421d9 | 2021-08-17 20:28:08 +0100 | [diff] [blame] | 2990 | __io_req_complete(req, issue_flags, ret, |
| 2991 | io_put_rw_kbuf(req)); |
Pavel Begunkov | 9728463 | 2021-04-08 19:28:03 +0100 | [diff] [blame] | 2992 | } |
| 2993 | } |
Jens Axboe | ba816ad | 2019-09-28 11:36:45 -0600 | [diff] [blame] | 2994 | } |
| 2995 | |
Pavel Begunkov | eae071c | 2021-04-25 14:32:24 +0100 | [diff] [blame] | 2996 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
| 2997 | struct io_mapped_ubuf *imu) |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 2998 | { |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 2999 | size_t len = req->rw.len; |
Pavel Begunkov | 75769e3 | 2021-04-01 15:43:54 +0100 | [diff] [blame] | 3000 | u64 buf_end, buf_addr = req->rw.addr; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 3001 | size_t offset; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 3002 | |
Pavel Begunkov | 75769e3 | 2021-04-01 15:43:54 +0100 | [diff] [blame] | 3003 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 3004 | return -EFAULT; |
| 3005 | /* not inside the mapped region */ |
Pavel Begunkov | 4751f53 | 2021-04-01 15:43:55 +0100 | [diff] [blame] | 3006 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 3007 | return -EFAULT; |
| 3008 | |
| 3009 | /* |
| 3010 | * May not be a start of buffer, set size appropriately |
| 3011 | * and advance us to the beginning. |
| 3012 | */ |
| 3013 | offset = buf_addr - imu->ubuf; |
| 3014 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); |
Jens Axboe | bd11b3a | 2019-07-20 08:37:31 -0600 | [diff] [blame] | 3015 | |
| 3016 | if (offset) { |
| 3017 | /* |
| 3018 | * Don't use iov_iter_advance() here, as it's really slow for |
| 3019 | * using the latter parts of a big fixed buffer - it iterates |
| 3020 | * over each segment manually. We can cheat a bit here, because |
| 3021 | * we know that: |
| 3022 | * |
| 3023 | * 1) it's a BVEC iter, we set it up |
| 3024 | * 2) all bvecs are PAGE_SIZE in size, except potentially the |
| 3025 | * first and last bvec |
| 3026 | * |
| 3027 | * So just find our index, and adjust the iterator afterwards. |
| 3028 | * If the offset is within the first bvec (or the whole first |
| 3029 | * bvec, just use iov_iter_advance(). This makes it easier |
| 3030 | * since we can just skip the first segment, which may not |
| 3031 | * be PAGE_SIZE aligned. |
| 3032 | */ |
| 3033 | const struct bio_vec *bvec = imu->bvec; |
| 3034 | |
| 3035 | if (offset <= bvec->bv_len) { |
| 3036 | iov_iter_advance(iter, offset); |
| 3037 | } else { |
| 3038 | unsigned long seg_skip; |
| 3039 | |
| 3040 | /* skip first vec */ |
| 3041 | offset -= bvec->bv_len; |
| 3042 | seg_skip = 1 + (offset >> PAGE_SHIFT); |
| 3043 | |
| 3044 | iter->bvec = bvec + seg_skip; |
| 3045 | iter->nr_segs -= seg_skip; |
Aleix Roca Nonell | 99c79f6 | 2019-08-15 14:03:22 +0200 | [diff] [blame] | 3046 | iter->count -= bvec->bv_len + offset; |
Jens Axboe | bd11b3a | 2019-07-20 08:37:31 -0600 | [diff] [blame] | 3047 | iter->iov_offset = offset & ~PAGE_MASK; |
Jens Axboe | bd11b3a | 2019-07-20 08:37:31 -0600 | [diff] [blame] | 3048 | } |
| 3049 | } |
| 3050 | |
Pavel Begunkov | 847595d | 2021-02-04 13:52:06 +0000 | [diff] [blame] | 3051 | return 0; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 3052 | } |
| 3053 | |
Pavel Begunkov | eae071c | 2021-04-25 14:32:24 +0100 | [diff] [blame] | 3054 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
| 3055 | { |
| 3056 | struct io_ring_ctx *ctx = req->ctx; |
| 3057 | struct io_mapped_ubuf *imu = req->imu; |
| 3058 | u16 index, buf_index = req->buf_index; |
| 3059 | |
| 3060 | if (likely(!imu)) { |
| 3061 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
| 3062 | return -EFAULT; |
| 3063 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
| 3064 | imu = READ_ONCE(ctx->user_bufs[index]); |
| 3065 | req->imu = imu; |
| 3066 | } |
| 3067 | return __io_import_fixed(req, rw, iter, imu); |
| 3068 | } |
| 3069 | |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 3070 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
| 3071 | { |
| 3072 | if (needs_lock) |
| 3073 | mutex_unlock(&ctx->uring_lock); |
| 3074 | } |
| 3075 | |
| 3076 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) |
| 3077 | { |
| 3078 | /* |
| 3079 | * "Normal" inline submissions always hold the uring_lock, since we |
| 3080 | * grab it from the system call. Same is true for the SQPOLL offload. |
| 3081 | * The only exception is when we've detached the request and issue it |
| 3082 | * from an async worker thread, grab the lock for that case. |
| 3083 | */ |
| 3084 | if (needs_lock) |
| 3085 | mutex_lock(&ctx->uring_lock); |
| 3086 | } |
| 3087 | |
| 3088 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, |
| 3089 | int bgid, struct io_buffer *kbuf, |
| 3090 | bool needs_lock) |
| 3091 | { |
| 3092 | struct io_buffer *head; |
| 3093 | |
| 3094 | if (req->flags & REQ_F_BUFFER_SELECTED) |
| 3095 | return kbuf; |
| 3096 | |
| 3097 | io_ring_submit_lock(req->ctx, needs_lock); |
| 3098 | |
| 3099 | lockdep_assert_held(&req->ctx->uring_lock); |
| 3100 | |
Jens Axboe | 9e15c3a | 2021-03-13 12:29:43 -0700 | [diff] [blame] | 3101 | head = xa_load(&req->ctx->io_buffers, bgid); |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 3102 | if (head) { |
| 3103 | if (!list_empty(&head->list)) { |
| 3104 | kbuf = list_last_entry(&head->list, struct io_buffer, |
| 3105 | list); |
| 3106 | list_del(&kbuf->list); |
| 3107 | } else { |
| 3108 | kbuf = head; |
Jens Axboe | 9e15c3a | 2021-03-13 12:29:43 -0700 | [diff] [blame] | 3109 | xa_erase(&req->ctx->io_buffers, bgid); |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 3110 | } |
| 3111 | if (*len > kbuf->len) |
| 3112 | *len = kbuf->len; |
| 3113 | } else { |
| 3114 | kbuf = ERR_PTR(-ENOBUFS); |
| 3115 | } |
| 3116 | |
| 3117 | io_ring_submit_unlock(req->ctx, needs_lock); |
| 3118 | |
| 3119 | return kbuf; |
| 3120 | } |
| 3121 | |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 3122 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
| 3123 | bool needs_lock) |
| 3124 | { |
| 3125 | struct io_buffer *kbuf; |
Bijan Mottahedeh | 4f4eeba | 2020-05-19 14:52:49 -0700 | [diff] [blame] | 3126 | u16 bgid; |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 3127 | |
| 3128 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
Bijan Mottahedeh | 4f4eeba | 2020-05-19 14:52:49 -0700 | [diff] [blame] | 3129 | bgid = req->buf_index; |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 3130 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
| 3131 | if (IS_ERR(kbuf)) |
| 3132 | return kbuf; |
| 3133 | req->rw.addr = (u64) (unsigned long) kbuf; |
| 3134 | req->flags |= REQ_F_BUFFER_SELECTED; |
| 3135 | return u64_to_user_ptr(kbuf->addr); |
| 3136 | } |
| 3137 | |
| 3138 | #ifdef CONFIG_COMPAT |
| 3139 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, |
| 3140 | bool needs_lock) |
| 3141 | { |
| 3142 | struct compat_iovec __user *uiov; |
| 3143 | compat_ssize_t clen; |
| 3144 | void __user *buf; |
| 3145 | ssize_t len; |
| 3146 | |
| 3147 | uiov = u64_to_user_ptr(req->rw.addr); |
| 3148 | if (!access_ok(uiov, sizeof(*uiov))) |
| 3149 | return -EFAULT; |
| 3150 | if (__get_user(clen, &uiov->iov_len)) |
| 3151 | return -EFAULT; |
| 3152 | if (clen < 0) |
| 3153 | return -EINVAL; |
| 3154 | |
| 3155 | len = clen; |
| 3156 | buf = io_rw_buffer_select(req, &len, needs_lock); |
| 3157 | if (IS_ERR(buf)) |
| 3158 | return PTR_ERR(buf); |
| 3159 | iov[0].iov_base = buf; |
| 3160 | iov[0].iov_len = (compat_size_t) len; |
| 3161 | return 0; |
| 3162 | } |
| 3163 | #endif |
| 3164 | |
| 3165 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, |
| 3166 | bool needs_lock) |
| 3167 | { |
| 3168 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); |
| 3169 | void __user *buf; |
| 3170 | ssize_t len; |
| 3171 | |
| 3172 | if (copy_from_user(iov, uiov, sizeof(*uiov))) |
| 3173 | return -EFAULT; |
| 3174 | |
| 3175 | len = iov[0].iov_len; |
| 3176 | if (len < 0) |
| 3177 | return -EINVAL; |
| 3178 | buf = io_rw_buffer_select(req, &len, needs_lock); |
| 3179 | if (IS_ERR(buf)) |
| 3180 | return PTR_ERR(buf); |
| 3181 | iov[0].iov_base = buf; |
| 3182 | iov[0].iov_len = len; |
| 3183 | return 0; |
| 3184 | } |
| 3185 | |
| 3186 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, |
| 3187 | bool needs_lock) |
| 3188 | { |
Jens Axboe | dddb3e2 | 2020-06-04 11:27:01 -0600 | [diff] [blame] | 3189 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
| 3190 | struct io_buffer *kbuf; |
| 3191 | |
| 3192 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
| 3193 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
| 3194 | iov[0].iov_len = kbuf->len; |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 3195 | return 0; |
Jens Axboe | dddb3e2 | 2020-06-04 11:27:01 -0600 | [diff] [blame] | 3196 | } |
Pavel Begunkov | dd20166 | 2020-12-19 03:15:43 +0000 | [diff] [blame] | 3197 | if (req->rw.len != 1) |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 3198 | return -EINVAL; |
| 3199 | |
| 3200 | #ifdef CONFIG_COMPAT |
| 3201 | if (req->ctx->compat) |
| 3202 | return io_compat_import(req, iov, needs_lock); |
| 3203 | #endif |
| 3204 | |
| 3205 | return __io_iov_buffer_select(req, iov, needs_lock); |
| 3206 | } |
| 3207 | |
Pavel Begunkov | 847595d | 2021-02-04 13:52:06 +0000 | [diff] [blame] | 3208 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
| 3209 | struct iov_iter *iter, bool needs_lock) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3210 | { |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 3211 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
| 3212 | size_t sqe_len = req->rw.len; |
Pavel Begunkov | 847595d | 2021-02-04 13:52:06 +0000 | [diff] [blame] | 3213 | u8 opcode = req->opcode; |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 3214 | ssize_t ret; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 3215 | |
Pavel Begunkov | 7d00916 | 2019-11-25 23:14:40 +0300 | [diff] [blame] | 3216 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 3217 | *iovec = NULL; |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 3218 | return io_import_fixed(req, rw, iter); |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 3219 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3220 | |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 3221 | /* buffer index only valid with fixed read/write, or buffer select */ |
Bijan Mottahedeh | 4f4eeba | 2020-05-19 14:52:49 -0700 | [diff] [blame] | 3222 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 3223 | return -EINVAL; |
| 3224 | |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 3225 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 3226 | if (req->flags & REQ_F_BUFFER_SELECT) { |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 3227 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
Pavel Begunkov | 867a23e | 2020-08-20 11:34:39 +0300 | [diff] [blame] | 3228 | if (IS_ERR(buf)) |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 3229 | return PTR_ERR(buf); |
Jens Axboe | 3f9d644 | 2020-03-11 12:27:04 -0600 | [diff] [blame] | 3230 | req->rw.len = sqe_len; |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 3231 | } |
| 3232 | |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 3233 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
| 3234 | *iovec = NULL; |
David Laight | 10fc72e | 2020-11-07 13:16:25 +0000 | [diff] [blame] | 3235 | return ret; |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 3236 | } |
| 3237 | |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 3238 | if (req->flags & REQ_F_BUFFER_SELECT) { |
| 3239 | ret = io_iov_buffer_select(req, *iovec, needs_lock); |
Pavel Begunkov | 847595d | 2021-02-04 13:52:06 +0000 | [diff] [blame] | 3240 | if (!ret) |
| 3241 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); |
Jens Axboe | 4d954c2 | 2020-02-27 07:31:19 -0700 | [diff] [blame] | 3242 | *iovec = NULL; |
| 3243 | return ret; |
| 3244 | } |
| 3245 | |
Christoph Hellwig | 89cd35c | 2020-09-25 06:51:41 +0200 | [diff] [blame] | 3246 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
| 3247 | req->ctx->compat); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3248 | } |
| 3249 | |
Jens Axboe | 0fef948 | 2020-08-26 10:36:20 -0600 | [diff] [blame] | 3250 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
| 3251 | { |
Pavel Begunkov | 5b09e37 | 2020-09-30 22:57:15 +0300 | [diff] [blame] | 3252 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
Jens Axboe | 0fef948 | 2020-08-26 10:36:20 -0600 | [diff] [blame] | 3253 | } |
| 3254 | |
Jens Axboe | 3296061 | 2019-09-23 11:05:34 -0600 | [diff] [blame] | 3255 | /* |
| 3256 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
| 3257 | * by looping over ->read() or ->write() manually. |
| 3258 | */ |
Jens Axboe | 4017eb9 | 2020-10-22 14:14:12 -0600 | [diff] [blame] | 3259 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
Jens Axboe | 3296061 | 2019-09-23 11:05:34 -0600 | [diff] [blame] | 3260 | { |
Jens Axboe | 4017eb9 | 2020-10-22 14:14:12 -0600 | [diff] [blame] | 3261 | struct kiocb *kiocb = &req->rw.kiocb; |
| 3262 | struct file *file = req->file; |
Jens Axboe | 3296061 | 2019-09-23 11:05:34 -0600 | [diff] [blame] | 3263 | ssize_t ret = 0; |
| 3264 | |
| 3265 | /* |
| 3266 | * Don't support polled IO through this interface, and we can't |
| 3267 | * support non-blocking either. For the latter, this just causes |
| 3268 | * the kiocb to be handled from an async context. |
| 3269 | */ |
| 3270 | if (kiocb->ki_flags & IOCB_HIPRI) |
| 3271 | return -EOPNOTSUPP; |
| 3272 | if (kiocb->ki_flags & IOCB_NOWAIT) |
| 3273 | return -EAGAIN; |
| 3274 | |
| 3275 | while (iov_iter_count(iter)) { |
Pavel Begunkov | 311ae9e | 2019-11-24 11:58:24 +0300 | [diff] [blame] | 3276 | struct iovec iovec; |
Jens Axboe | 3296061 | 2019-09-23 11:05:34 -0600 | [diff] [blame] | 3277 | ssize_t nr; |
| 3278 | |
Pavel Begunkov | 311ae9e | 2019-11-24 11:58:24 +0300 | [diff] [blame] | 3279 | if (!iov_iter_is_bvec(iter)) { |
| 3280 | iovec = iov_iter_iovec(iter); |
| 3281 | } else { |
Jens Axboe | 4017eb9 | 2020-10-22 14:14:12 -0600 | [diff] [blame] | 3282 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
| 3283 | iovec.iov_len = req->rw.len; |
Pavel Begunkov | 311ae9e | 2019-11-24 11:58:24 +0300 | [diff] [blame] | 3284 | } |
| 3285 | |
Jens Axboe | 3296061 | 2019-09-23 11:05:34 -0600 | [diff] [blame] | 3286 | if (rw == READ) { |
| 3287 | nr = file->f_op->read(file, iovec.iov_base, |
Jens Axboe | 0fef948 | 2020-08-26 10:36:20 -0600 | [diff] [blame] | 3288 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
Jens Axboe | 3296061 | 2019-09-23 11:05:34 -0600 | [diff] [blame] | 3289 | } else { |
| 3290 | nr = file->f_op->write(file, iovec.iov_base, |
Jens Axboe | 0fef948 | 2020-08-26 10:36:20 -0600 | [diff] [blame] | 3291 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
Jens Axboe | 3296061 | 2019-09-23 11:05:34 -0600 | [diff] [blame] | 3292 | } |
| 3293 | |
| 3294 | if (nr < 0) { |
| 3295 | if (!ret) |
| 3296 | ret = nr; |
| 3297 | break; |
| 3298 | } |
| 3299 | ret += nr; |
| 3300 | if (nr != iovec.iov_len) |
| 3301 | break; |
Jens Axboe | 4017eb9 | 2020-10-22 14:14:12 -0600 | [diff] [blame] | 3302 | req->rw.len -= nr; |
| 3303 | req->rw.addr += nr; |
Jens Axboe | 3296061 | 2019-09-23 11:05:34 -0600 | [diff] [blame] | 3304 | iov_iter_advance(iter, nr); |
| 3305 | } |
| 3306 | |
| 3307 | return ret; |
| 3308 | } |
| 3309 | |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 3310 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
| 3311 | const struct iovec *fast_iov, struct iov_iter *iter) |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3312 | { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3313 | struct io_async_rw *rw = req->async_data; |
Pavel Begunkov | b64e344 | 2020-07-13 22:59:18 +0300 | [diff] [blame] | 3314 | |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 3315 | memcpy(&rw->iter, iter, sizeof(*iter)); |
Pavel Begunkov | afb8765 | 2020-09-06 00:45:46 +0300 | [diff] [blame] | 3316 | rw->free_iovec = iovec; |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3317 | rw->bytes_done = 0; |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 3318 | /* can only be fixed buffers, no need to do anything */ |
Pavel Begunkov | 9c3a205 | 2020-11-23 23:20:27 +0000 | [diff] [blame] | 3319 | if (iov_iter_is_bvec(iter)) |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 3320 | return; |
Pavel Begunkov | b64e344 | 2020-07-13 22:59:18 +0300 | [diff] [blame] | 3321 | if (!iovec) { |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 3322 | unsigned iov_off = 0; |
| 3323 | |
| 3324 | rw->iter.iov = rw->fast_iov; |
| 3325 | if (iter->iov != fast_iov) { |
| 3326 | iov_off = iter->iov - fast_iov; |
| 3327 | rw->iter.iov += iov_off; |
| 3328 | } |
| 3329 | if (rw->fast_iov != fast_iov) |
| 3330 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, |
Xiaoguang Wang | 45097da | 2020-04-08 22:29:58 +0800 | [diff] [blame] | 3331 | sizeof(struct iovec) * iter->nr_segs); |
Pavel Begunkov | 99bc4c3 | 2020-02-07 22:04:45 +0300 | [diff] [blame] | 3332 | } else { |
| 3333 | req->flags |= REQ_F_NEED_CLEANUP; |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3334 | } |
| 3335 | } |
| 3336 | |
Pavel Begunkov | 6cb7868 | 2021-02-28 22:35:17 +0000 | [diff] [blame] | 3337 | static inline int io_alloc_async_data(struct io_kiocb *req) |
Xiaoguang Wang | 3d9932a | 2020-03-27 15:36:52 +0800 | [diff] [blame] | 3338 | { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3339 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
| 3340 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); |
| 3341 | return req->async_data == NULL; |
Xiaoguang Wang | 3d9932a | 2020-03-27 15:36:52 +0800 | [diff] [blame] | 3342 | } |
| 3343 | |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 3344 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
| 3345 | const struct iovec *fast_iov, |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3346 | struct iov_iter *iter, bool force) |
Jens Axboe | b7bb4f7 | 2019-12-15 22:13:43 -0700 | [diff] [blame] | 3347 | { |
Pavel Begunkov | 26f0505 | 2021-02-28 22:35:18 +0000 | [diff] [blame] | 3348 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
Jens Axboe | 74566df | 2020-01-13 19:23:24 -0700 | [diff] [blame] | 3349 | return 0; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3350 | if (!req->async_data) { |
Pavel Begunkov | 6cb7868 | 2021-02-28 22:35:17 +0000 | [diff] [blame] | 3351 | if (io_alloc_async_data(req)) { |
Pavel Begunkov | 6bf985d | 2021-02-04 13:52:01 +0000 | [diff] [blame] | 3352 | kfree(iovec); |
Jens Axboe | 5d204bc | 2020-01-31 12:06:52 -0700 | [diff] [blame] | 3353 | return -ENOMEM; |
Pavel Begunkov | 6bf985d | 2021-02-04 13:52:01 +0000 | [diff] [blame] | 3354 | } |
Jens Axboe | b7bb4f7 | 2019-12-15 22:13:43 -0700 | [diff] [blame] | 3355 | |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 3356 | io_req_map_rw(req, iovec, fast_iov, iter); |
Jens Axboe | 5d204bc | 2020-01-31 12:06:52 -0700 | [diff] [blame] | 3357 | } |
Jens Axboe | b7bb4f7 | 2019-12-15 22:13:43 -0700 | [diff] [blame] | 3358 | return 0; |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3359 | } |
| 3360 | |
Pavel Begunkov | 73debe6 | 2020-09-30 22:57:54 +0300 | [diff] [blame] | 3361 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
Pavel Begunkov | c3e330a | 2020-07-13 22:59:19 +0300 | [diff] [blame] | 3362 | { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3363 | struct io_async_rw *iorw = req->async_data; |
Pavel Begunkov | f4bff10 | 2020-09-06 00:45:45 +0300 | [diff] [blame] | 3364 | struct iovec *iov = iorw->fast_iov; |
Pavel Begunkov | 847595d | 2021-02-04 13:52:06 +0000 | [diff] [blame] | 3365 | int ret; |
Pavel Begunkov | c3e330a | 2020-07-13 22:59:19 +0300 | [diff] [blame] | 3366 | |
Pavel Begunkov | 2846c48 | 2020-11-07 13:16:27 +0000 | [diff] [blame] | 3367 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
Pavel Begunkov | c3e330a | 2020-07-13 22:59:19 +0300 | [diff] [blame] | 3368 | if (unlikely(ret < 0)) |
| 3369 | return ret; |
| 3370 | |
Pavel Begunkov | ab0b196 | 2020-09-06 00:45:47 +0300 | [diff] [blame] | 3371 | iorw->bytes_done = 0; |
| 3372 | iorw->free_iovec = iov; |
| 3373 | if (iov) |
| 3374 | req->flags |= REQ_F_NEED_CLEANUP; |
Pavel Begunkov | c3e330a | 2020-07-13 22:59:19 +0300 | [diff] [blame] | 3375 | return 0; |
| 3376 | } |
| 3377 | |
Pavel Begunkov | 73debe6 | 2020-09-30 22:57:54 +0300 | [diff] [blame] | 3378 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3379 | { |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 3380 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
| 3381 | return -EBADF; |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 3382 | return io_prep_rw(req, sqe); |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3383 | } |
| 3384 | |
Jens Axboe | c1dd91d | 2020-08-03 16:43:59 -0600 | [diff] [blame] | 3385 | /* |
| 3386 | * This is our waitqueue callback handler, registered through lock_page_async() |
| 3387 | * when we initially tried to do the IO with the iocb armed our waitqueue. |
| 3388 | * This gets called when the page is unlocked, and we generally expect that to |
| 3389 | * happen when the page IO is completed and the page is now uptodate. This will |
| 3390 | * queue a task_work based retry of the operation, attempting to copy the data |
| 3391 | * again. If the latter fails because the page was NOT uptodate, then we will |
| 3392 | * do a thread based blocking retry of the operation. That's the unexpected |
| 3393 | * slow path. |
| 3394 | */ |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3395 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
| 3396 | int sync, void *arg) |
| 3397 | { |
| 3398 | struct wait_page_queue *wpq; |
| 3399 | struct io_kiocb *req = wait->private; |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3400 | struct wait_page_key *key = arg; |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3401 | |
| 3402 | wpq = container_of(wait, struct wait_page_queue, wait); |
| 3403 | |
Linus Torvalds | cdc8fcb | 2020-08-03 13:01:22 -0700 | [diff] [blame] | 3404 | if (!wake_page_match(wpq, key)) |
| 3405 | return 0; |
| 3406 | |
Hao Xu | c8d317a | 2020-09-29 20:00:45 +0800 | [diff] [blame] | 3407 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3408 | list_del_init(&wait->entry); |
Pavel Begunkov | 921b905 | 2021-02-12 03:23:53 +0000 | [diff] [blame] | 3409 | io_req_task_queue(req); |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3410 | return 1; |
| 3411 | } |
| 3412 | |
Jens Axboe | c1dd91d | 2020-08-03 16:43:59 -0600 | [diff] [blame] | 3413 | /* |
| 3414 | * This controls whether a given IO request should be armed for async page |
| 3415 | * based retry. If we return false here, the request is handed to the async |
| 3416 | * worker threads for retry. If we're doing buffered reads on a regular file, |
| 3417 | * we prepare a private wait_page_queue entry and retry the operation. This |
| 3418 | * will either succeed because the page is now uptodate and unlocked, or it |
| 3419 | * will register a callback when the page is unlocked at IO completion. Through |
| 3420 | * that callback, io_uring uses task_work to setup a retry of the operation. |
| 3421 | * That retry will attempt the buffered read again. The retry will generally |
| 3422 | * succeed, or in rare cases where it fails, we then fall back to using the |
| 3423 | * async worker threads for a blocking retry. |
| 3424 | */ |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3425 | static bool io_rw_should_retry(struct io_kiocb *req) |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3426 | { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3427 | struct io_async_rw *rw = req->async_data; |
| 3428 | struct wait_page_queue *wait = &rw->wpq; |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3429 | struct kiocb *kiocb = &req->rw.kiocb; |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3430 | |
| 3431 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
| 3432 | if (req->flags & REQ_F_NOWAIT) |
| 3433 | return false; |
| 3434 | |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3435 | /* Only for buffered IO */ |
Jens Axboe | 3b2a443 | 2020-08-16 10:58:43 -0700 | [diff] [blame] | 3436 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3437 | return false; |
Jens Axboe | 3b2a443 | 2020-08-16 10:58:43 -0700 | [diff] [blame] | 3438 | |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3439 | /* |
| 3440 | * just use poll if we can, and don't attempt if the fs doesn't |
| 3441 | * support callback based unlocks |
| 3442 | */ |
| 3443 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) |
| 3444 | return false; |
| 3445 | |
Jens Axboe | 3b2a443 | 2020-08-16 10:58:43 -0700 | [diff] [blame] | 3446 | wait->wait.func = io_async_buf_func; |
| 3447 | wait->wait.private = req; |
| 3448 | wait->wait.flags = 0; |
| 3449 | INIT_LIST_HEAD(&wait->wait.entry); |
| 3450 | kiocb->ki_flags |= IOCB_WAITQ; |
Hao Xu | c8d317a | 2020-09-29 20:00:45 +0800 | [diff] [blame] | 3451 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
Jens Axboe | 3b2a443 | 2020-08-16 10:58:43 -0700 | [diff] [blame] | 3452 | kiocb->ki_waitq = wait; |
Jens Axboe | 3b2a443 | 2020-08-16 10:58:43 -0700 | [diff] [blame] | 3453 | return true; |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3454 | } |
| 3455 | |
Pavel Begunkov | aeab950 | 2021-06-14 02:36:24 +0100 | [diff] [blame] | 3456 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3457 | { |
| 3458 | if (req->file->f_op->read_iter) |
| 3459 | return call_read_iter(req->file, &req->rw.kiocb, iter); |
Guoyu Huang | 2dd2111 | 2020-08-05 03:53:50 -0700 | [diff] [blame] | 3460 | else if (req->file->f_op->read) |
Jens Axboe | 4017eb9 | 2020-10-22 14:14:12 -0600 | [diff] [blame] | 3461 | return loop_rw_iter(READ, req, iter); |
Guoyu Huang | 2dd2111 | 2020-08-05 03:53:50 -0700 | [diff] [blame] | 3462 | else |
| 3463 | return -EINVAL; |
Jens Axboe | bcf5a06 | 2020-05-22 09:24:42 -0600 | [diff] [blame] | 3464 | } |
| 3465 | |
Ming Lei | 7db3043 | 2021-08-21 23:07:51 +0800 | [diff] [blame] | 3466 | static bool need_read_all(struct io_kiocb *req) |
| 3467 | { |
| 3468 | return req->flags & REQ_F_ISREG || |
| 3469 | S_ISBLK(file_inode(req->file)->i_mode); |
| 3470 | } |
| 3471 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 3472 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3473 | { |
| 3474 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 3475 | struct kiocb *kiocb = &req->rw.kiocb; |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 3476 | struct iov_iter __iter, *iter = &__iter; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3477 | struct io_async_rw *rw = req->async_data; |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3478 | ssize_t io_size, ret, ret2; |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 3479 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3480 | |
Pavel Begunkov | 2846c48 | 2020-11-07 13:16:27 +0000 | [diff] [blame] | 3481 | if (rw) { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3482 | iter = &rw->iter; |
Pavel Begunkov | 2846c48 | 2020-11-07 13:16:27 +0000 | [diff] [blame] | 3483 | iovec = NULL; |
| 3484 | } else { |
| 3485 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); |
| 3486 | if (ret < 0) |
| 3487 | return ret; |
| 3488 | } |
Pavel Begunkov | 632546c | 2020-11-07 13:16:26 +0000 | [diff] [blame] | 3489 | io_size = iov_iter_count(iter); |
Pavel Begunkov | fa15baf | 2020-08-01 13:50:02 +0300 | [diff] [blame] | 3490 | req->result = io_size; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3491 | |
Jens Axboe | fd6c2e4 | 2019-12-18 12:19:41 -0700 | [diff] [blame] | 3492 | /* Ensure we clear previously set non-block flag */ |
| 3493 | if (!force_nonblock) |
Jens Axboe | 29de5f6 | 2020-02-20 09:56:08 -0700 | [diff] [blame] | 3494 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
Pavel Begunkov | a88fc40 | 2020-09-30 22:57:53 +0300 | [diff] [blame] | 3495 | else |
| 3496 | kiocb->ki_flags |= IOCB_NOWAIT; |
| 3497 | |
Pavel Begunkov | 24c7467 | 2020-06-21 13:09:51 +0300 | [diff] [blame] | 3498 | /* If the file doesn't support async, just async punt */ |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 3499 | if (force_nonblock && !io_file_supports_nowait(req, READ)) { |
Pavel Begunkov | 6713e7a | 2021-02-04 13:51:59 +0000 | [diff] [blame] | 3500 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
Pavel Begunkov | 6bf985d | 2021-02-04 13:52:01 +0000 | [diff] [blame] | 3501 | return ret ?: -EAGAIN; |
Pavel Begunkov | 6713e7a | 2021-02-04 13:51:59 +0000 | [diff] [blame] | 3502 | } |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 3503 | |
Pavel Begunkov | 632546c | 2020-11-07 13:16:26 +0000 | [diff] [blame] | 3504 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
Pavel Begunkov | 5ea5dd4 | 2021-02-04 13:52:03 +0000 | [diff] [blame] | 3505 | if (unlikely(ret)) { |
| 3506 | kfree(iovec); |
| 3507 | return ret; |
| 3508 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3509 | |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3510 | ret = io_iter_do_read(req, iter); |
Jens Axboe | 3296061 | 2019-09-23 11:05:34 -0600 | [diff] [blame] | 3511 | |
Jens Axboe | 230d50d | 2021-04-01 20:41:15 -0600 | [diff] [blame] | 3512 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
Pavel Begunkov | 6ad7f233 | 2021-04-08 01:54:39 +0100 | [diff] [blame] | 3513 | req->flags &= ~REQ_F_REISSUE; |
Jens Axboe | eefdf30 | 2020-08-27 16:40:19 -0600 | [diff] [blame] | 3514 | /* IOPOLL retry should happen for io-wq threads */ |
| 3515 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) |
Jens Axboe | f91daf5 | 2020-08-15 15:58:42 -0700 | [diff] [blame] | 3516 | goto done; |
Pavel Begunkov | 75c668c | 2021-02-04 13:52:05 +0000 | [diff] [blame] | 3517 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
| 3518 | if (req->flags & REQ_F_NOWAIT) |
Jens Axboe | 355afae | 2020-09-02 09:30:31 -0600 | [diff] [blame] | 3519 | goto done; |
Jens Axboe | 8421631 | 2020-08-24 11:45:26 -0600 | [diff] [blame] | 3520 | /* some cases will consume bytes even on error returns */ |
Pavel Begunkov | 89c2b3b | 2021-08-23 11:18:45 +0100 | [diff] [blame] | 3521 | iov_iter_reexpand(iter, iter->count + iter->truncated); |
Pavel Begunkov | 632546c | 2020-11-07 13:16:26 +0000 | [diff] [blame] | 3522 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
Jens Axboe | f38c7e3 | 2020-09-25 15:23:43 -0600 | [diff] [blame] | 3523 | ret = 0; |
Jens Axboe | 230d50d | 2021-04-01 20:41:15 -0600 | [diff] [blame] | 3524 | } else if (ret == -EIOCBQUEUED) { |
| 3525 | goto out_free; |
Pavel Begunkov | 7335e3b | 2021-02-04 13:52:02 +0000 | [diff] [blame] | 3526 | } else if (ret <= 0 || ret == io_size || !force_nonblock || |
Ming Lei | 7db3043 | 2021-08-21 23:07:51 +0800 | [diff] [blame] | 3527 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
Pavel Begunkov | 7335e3b | 2021-02-04 13:52:02 +0000 | [diff] [blame] | 3528 | /* read all, failed, already did sync or don't want to retry */ |
Jens Axboe | 00d23d5 | 2020-08-25 12:59:22 -0600 | [diff] [blame] | 3529 | goto done; |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3530 | } |
| 3531 | |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3532 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
Pavel Begunkov | 6bf985d | 2021-02-04 13:52:01 +0000 | [diff] [blame] | 3533 | if (ret2) |
| 3534 | return ret2; |
| 3535 | |
Pavel Begunkov | fe1cdd5 | 2021-02-17 21:02:36 +0000 | [diff] [blame] | 3536 | iovec = NULL; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3537 | rw = req->async_data; |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3538 | /* now use our persistent iterator, if we aren't already */ |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3539 | iter = &rw->iter; |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3540 | |
Pavel Begunkov | b23df91 | 2021-02-04 13:52:04 +0000 | [diff] [blame] | 3541 | do { |
| 3542 | io_size -= ret; |
| 3543 | rw->bytes_done += ret; |
| 3544 | /* if we can retry, do so with the callbacks armed */ |
| 3545 | if (!io_rw_should_retry(req)) { |
| 3546 | kiocb->ki_flags &= ~IOCB_WAITQ; |
| 3547 | return -EAGAIN; |
| 3548 | } |
| 3549 | |
| 3550 | /* |
| 3551 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If |
| 3552 | * we get -EIOCBQUEUED, then we'll get a notification when the |
| 3553 | * desired page gets unlocked. We can also get a partial read |
| 3554 | * here, and if we do, then just retry at the new offset. |
| 3555 | */ |
| 3556 | ret = io_iter_do_read(req, iter); |
| 3557 | if (ret == -EIOCBQUEUED) |
| 3558 | return 0; |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3559 | /* we got some bytes, but not all. retry. */ |
Jens Axboe | b5b0ecb | 2021-03-04 21:02:58 -0700 | [diff] [blame] | 3560 | kiocb->ki_flags &= ~IOCB_WAITQ; |
Pavel Begunkov | b23df91 | 2021-02-04 13:52:04 +0000 | [diff] [blame] | 3561 | } while (ret > 0 && ret < io_size); |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3562 | done: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 3563 | kiocb_done(kiocb, ret, issue_flags); |
Pavel Begunkov | fe1cdd5 | 2021-02-17 21:02:36 +0000 | [diff] [blame] | 3564 | out_free: |
| 3565 | /* it's faster to check here then delegate to kfree */ |
| 3566 | if (iovec) |
| 3567 | kfree(iovec); |
Pavel Begunkov | 5ea5dd4 | 2021-02-04 13:52:03 +0000 | [diff] [blame] | 3568 | return 0; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3569 | } |
| 3570 | |
Pavel Begunkov | 73debe6 | 2020-09-30 22:57:54 +0300 | [diff] [blame] | 3571 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3572 | { |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 3573 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
| 3574 | return -EBADF; |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 3575 | return io_prep_rw(req, sqe); |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3576 | } |
| 3577 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 3578 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3579 | { |
| 3580 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 3581 | struct kiocb *kiocb = &req->rw.kiocb; |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 3582 | struct iov_iter __iter, *iter = &__iter; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3583 | struct io_async_rw *rw = req->async_data; |
Pavel Begunkov | fa15baf | 2020-08-01 13:50:02 +0300 | [diff] [blame] | 3584 | ssize_t ret, ret2, io_size; |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 3585 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3586 | |
Pavel Begunkov | 2846c48 | 2020-11-07 13:16:27 +0000 | [diff] [blame] | 3587 | if (rw) { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 3588 | iter = &rw->iter; |
Pavel Begunkov | 2846c48 | 2020-11-07 13:16:27 +0000 | [diff] [blame] | 3589 | iovec = NULL; |
| 3590 | } else { |
| 3591 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); |
| 3592 | if (ret < 0) |
| 3593 | return ret; |
| 3594 | } |
Pavel Begunkov | 632546c | 2020-11-07 13:16:26 +0000 | [diff] [blame] | 3595 | io_size = iov_iter_count(iter); |
Pavel Begunkov | fa15baf | 2020-08-01 13:50:02 +0300 | [diff] [blame] | 3596 | req->result = io_size; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3597 | |
Jens Axboe | fd6c2e4 | 2019-12-18 12:19:41 -0700 | [diff] [blame] | 3598 | /* Ensure we clear previously set non-block flag */ |
| 3599 | if (!force_nonblock) |
Pavel Begunkov | a88fc40 | 2020-09-30 22:57:53 +0300 | [diff] [blame] | 3600 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
| 3601 | else |
| 3602 | kiocb->ki_flags |= IOCB_NOWAIT; |
Jens Axboe | fd6c2e4 | 2019-12-18 12:19:41 -0700 | [diff] [blame] | 3603 | |
Pavel Begunkov | 24c7467 | 2020-06-21 13:09:51 +0300 | [diff] [blame] | 3604 | /* If the file doesn't support async, just async punt */ |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 3605 | if (force_nonblock && !io_file_supports_nowait(req, WRITE)) |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3606 | goto copy_iov; |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3607 | |
Jens Axboe | 10d5934 | 2019-12-09 20:16:22 -0700 | [diff] [blame] | 3608 | /* file path doesn't support NOWAIT for non-direct_IO */ |
| 3609 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && |
| 3610 | (req->flags & REQ_F_ISREG)) |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3611 | goto copy_iov; |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 3612 | |
Pavel Begunkov | 632546c | 2020-11-07 13:16:26 +0000 | [diff] [blame] | 3613 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
Pavel Begunkov | fa15baf | 2020-08-01 13:50:02 +0300 | [diff] [blame] | 3614 | if (unlikely(ret)) |
| 3615 | goto out_free; |
Roman Penyaev | 9bf7933 | 2019-03-25 20:09:24 +0100 | [diff] [blame] | 3616 | |
Pavel Begunkov | fa15baf | 2020-08-01 13:50:02 +0300 | [diff] [blame] | 3617 | /* |
| 3618 | * Open-code file_start_write here to grab freeze protection, |
| 3619 | * which will be released by another thread in |
| 3620 | * io_complete_rw(). Fool lockdep by telling it the lock got |
| 3621 | * released so that it doesn't complain about the held lock when |
| 3622 | * we return to userspace. |
| 3623 | */ |
| 3624 | if (req->flags & REQ_F_ISREG) { |
Darrick J. Wong | 8a3c84b | 2020-11-10 16:50:21 -0800 | [diff] [blame] | 3625 | sb_start_write(file_inode(req->file)->i_sb); |
Pavel Begunkov | fa15baf | 2020-08-01 13:50:02 +0300 | [diff] [blame] | 3626 | __sb_writers_release(file_inode(req->file)->i_sb, |
| 3627 | SB_FREEZE_WRITE); |
| 3628 | } |
| 3629 | kiocb->ki_flags |= IOCB_WRITE; |
Roman Penyaev | 9bf7933 | 2019-03-25 20:09:24 +0100 | [diff] [blame] | 3630 | |
Pavel Begunkov | fa15baf | 2020-08-01 13:50:02 +0300 | [diff] [blame] | 3631 | if (req->file->f_op->write_iter) |
Jens Axboe | ff6165b | 2020-08-13 09:47:43 -0600 | [diff] [blame] | 3632 | ret2 = call_write_iter(req->file, kiocb, iter); |
Guoyu Huang | 2dd2111 | 2020-08-05 03:53:50 -0700 | [diff] [blame] | 3633 | else if (req->file->f_op->write) |
Jens Axboe | 4017eb9 | 2020-10-22 14:14:12 -0600 | [diff] [blame] | 3634 | ret2 = loop_rw_iter(WRITE, req, iter); |
Guoyu Huang | 2dd2111 | 2020-08-05 03:53:50 -0700 | [diff] [blame] | 3635 | else |
| 3636 | ret2 = -EINVAL; |
Jens Axboe | 4ed734b | 2020-03-20 11:23:41 -0600 | [diff] [blame] | 3637 | |
Pavel Begunkov | 6ad7f233 | 2021-04-08 01:54:39 +0100 | [diff] [blame] | 3638 | if (req->flags & REQ_F_REISSUE) { |
| 3639 | req->flags &= ~REQ_F_REISSUE; |
Jens Axboe | 230d50d | 2021-04-01 20:41:15 -0600 | [diff] [blame] | 3640 | ret2 = -EAGAIN; |
Pavel Begunkov | 6ad7f233 | 2021-04-08 01:54:39 +0100 | [diff] [blame] | 3641 | } |
Jens Axboe | 230d50d | 2021-04-01 20:41:15 -0600 | [diff] [blame] | 3642 | |
Pavel Begunkov | fa15baf | 2020-08-01 13:50:02 +0300 | [diff] [blame] | 3643 | /* |
| 3644 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just |
| 3645 | * retry them without IOCB_NOWAIT. |
| 3646 | */ |
| 3647 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) |
| 3648 | ret2 = -EAGAIN; |
Pavel Begunkov | 75c668c | 2021-02-04 13:52:05 +0000 | [diff] [blame] | 3649 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
| 3650 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) |
Jens Axboe | 355afae | 2020-09-02 09:30:31 -0600 | [diff] [blame] | 3651 | goto done; |
Pavel Begunkov | fa15baf | 2020-08-01 13:50:02 +0300 | [diff] [blame] | 3652 | if (!force_nonblock || ret2 != -EAGAIN) { |
Jens Axboe | eefdf30 | 2020-08-27 16:40:19 -0600 | [diff] [blame] | 3653 | /* IOPOLL retry should happen for io-wq threads */ |
| 3654 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) |
| 3655 | goto copy_iov; |
Jens Axboe | 355afae | 2020-09-02 09:30:31 -0600 | [diff] [blame] | 3656 | done: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 3657 | kiocb_done(kiocb, ret2, issue_flags); |
Pavel Begunkov | fa15baf | 2020-08-01 13:50:02 +0300 | [diff] [blame] | 3658 | } else { |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 3659 | copy_iov: |
Jens Axboe | 8421631 | 2020-08-24 11:45:26 -0600 | [diff] [blame] | 3660 | /* some cases will consume bytes even on error returns */ |
Pavel Begunkov | 89c2b3b | 2021-08-23 11:18:45 +0100 | [diff] [blame] | 3661 | iov_iter_reexpand(iter, iter->count + iter->truncated); |
Pavel Begunkov | 632546c | 2020-11-07 13:16:26 +0000 | [diff] [blame] | 3662 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
Jens Axboe | 227c0c9 | 2020-08-13 11:51:40 -0600 | [diff] [blame] | 3663 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
Pavel Begunkov | 6bf985d | 2021-02-04 13:52:01 +0000 | [diff] [blame] | 3664 | return ret ?: -EAGAIN; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3665 | } |
Jens Axboe | 31b5151 | 2019-01-18 22:56:34 -0700 | [diff] [blame] | 3666 | out_free: |
Pavel Begunkov | f261c16 | 2020-08-20 11:34:10 +0300 | [diff] [blame] | 3667 | /* it's reportedly faster than delegating the null check to kfree() */ |
Pavel Begunkov | 252917c | 2020-07-13 22:59:20 +0300 | [diff] [blame] | 3668 | if (iovec) |
Xiaoguang Wang | 6f2cc16 | 2020-06-18 15:01:56 +0800 | [diff] [blame] | 3669 | kfree(iovec); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 3670 | return ret; |
| 3671 | } |
| 3672 | |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 3673 | static int io_renameat_prep(struct io_kiocb *req, |
| 3674 | const struct io_uring_sqe *sqe) |
| 3675 | { |
| 3676 | struct io_rename *ren = &req->rename; |
| 3677 | const char __user *oldf, *newf; |
| 3678 | |
Jens Axboe | ed7eb25 | 2021-06-23 09:04:13 -0600 | [diff] [blame] | 3679 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 3680 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 3681 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
Jens Axboe | ed7eb25 | 2021-06-23 09:04:13 -0600 | [diff] [blame] | 3682 | return -EINVAL; |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 3683 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
| 3684 | return -EBADF; |
| 3685 | |
| 3686 | ren->old_dfd = READ_ONCE(sqe->fd); |
| 3687 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 3688 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
| 3689 | ren->new_dfd = READ_ONCE(sqe->len); |
| 3690 | ren->flags = READ_ONCE(sqe->rename_flags); |
| 3691 | |
| 3692 | ren->oldpath = getname(oldf); |
| 3693 | if (IS_ERR(ren->oldpath)) |
| 3694 | return PTR_ERR(ren->oldpath); |
| 3695 | |
| 3696 | ren->newpath = getname(newf); |
| 3697 | if (IS_ERR(ren->newpath)) { |
| 3698 | putname(ren->oldpath); |
| 3699 | return PTR_ERR(ren->newpath); |
| 3700 | } |
| 3701 | |
| 3702 | req->flags |= REQ_F_NEED_CLEANUP; |
| 3703 | return 0; |
| 3704 | } |
| 3705 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 3706 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 3707 | { |
| 3708 | struct io_rename *ren = &req->rename; |
| 3709 | int ret; |
| 3710 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 3711 | if (issue_flags & IO_URING_F_NONBLOCK) |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 3712 | return -EAGAIN; |
| 3713 | |
| 3714 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, |
| 3715 | ren->newpath, ren->flags); |
| 3716 | |
| 3717 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 3718 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 3719 | req_set_fail(req); |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 3720 | io_req_complete(req, ret); |
| 3721 | return 0; |
| 3722 | } |
| 3723 | |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 3724 | static int io_unlinkat_prep(struct io_kiocb *req, |
| 3725 | const struct io_uring_sqe *sqe) |
| 3726 | { |
| 3727 | struct io_unlink *un = &req->unlink; |
| 3728 | const char __user *fname; |
| 3729 | |
Jens Axboe | 22634bc | 2021-06-23 09:07:45 -0600 | [diff] [blame] | 3730 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 3731 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 3732 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || |
| 3733 | sqe->splice_fd_in) |
Jens Axboe | 22634bc | 2021-06-23 09:07:45 -0600 | [diff] [blame] | 3734 | return -EINVAL; |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 3735 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
| 3736 | return -EBADF; |
| 3737 | |
| 3738 | un->dfd = READ_ONCE(sqe->fd); |
| 3739 | |
| 3740 | un->flags = READ_ONCE(sqe->unlink_flags); |
| 3741 | if (un->flags & ~AT_REMOVEDIR) |
| 3742 | return -EINVAL; |
| 3743 | |
| 3744 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 3745 | un->filename = getname(fname); |
| 3746 | if (IS_ERR(un->filename)) |
| 3747 | return PTR_ERR(un->filename); |
| 3748 | |
| 3749 | req->flags |= REQ_F_NEED_CLEANUP; |
| 3750 | return 0; |
| 3751 | } |
| 3752 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 3753 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 3754 | { |
| 3755 | struct io_unlink *un = &req->unlink; |
| 3756 | int ret; |
| 3757 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 3758 | if (issue_flags & IO_URING_F_NONBLOCK) |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 3759 | return -EAGAIN; |
| 3760 | |
| 3761 | if (un->flags & AT_REMOVEDIR) |
| 3762 | ret = do_rmdir(un->dfd, un->filename); |
| 3763 | else |
| 3764 | ret = do_unlinkat(un->dfd, un->filename); |
| 3765 | |
| 3766 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 3767 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 3768 | req_set_fail(req); |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 3769 | io_req_complete(req, ret); |
| 3770 | return 0; |
| 3771 | } |
| 3772 | |
Dmitry Kadashev | e34a02d | 2021-07-08 13:34:45 +0700 | [diff] [blame] | 3773 | static int io_mkdirat_prep(struct io_kiocb *req, |
| 3774 | const struct io_uring_sqe *sqe) |
| 3775 | { |
| 3776 | struct io_mkdir *mkd = &req->mkdir; |
| 3777 | const char __user *fname; |
| 3778 | |
| 3779 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 3780 | return -EINVAL; |
| 3781 | if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || |
| 3782 | sqe->splice_fd_in) |
| 3783 | return -EINVAL; |
| 3784 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
| 3785 | return -EBADF; |
| 3786 | |
| 3787 | mkd->dfd = READ_ONCE(sqe->fd); |
| 3788 | mkd->mode = READ_ONCE(sqe->len); |
| 3789 | |
| 3790 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 3791 | mkd->filename = getname(fname); |
| 3792 | if (IS_ERR(mkd->filename)) |
| 3793 | return PTR_ERR(mkd->filename); |
| 3794 | |
| 3795 | req->flags |= REQ_F_NEED_CLEANUP; |
| 3796 | return 0; |
| 3797 | } |
| 3798 | |
| 3799 | static int io_mkdirat(struct io_kiocb *req, int issue_flags) |
| 3800 | { |
| 3801 | struct io_mkdir *mkd = &req->mkdir; |
| 3802 | int ret; |
| 3803 | |
| 3804 | if (issue_flags & IO_URING_F_NONBLOCK) |
| 3805 | return -EAGAIN; |
| 3806 | |
| 3807 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); |
| 3808 | |
| 3809 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 3810 | if (ret < 0) |
| 3811 | req_set_fail(req); |
| 3812 | io_req_complete(req, ret); |
| 3813 | return 0; |
| 3814 | } |
| 3815 | |
Dmitry Kadashev | 7a8721f | 2021-07-08 13:34:46 +0700 | [diff] [blame] | 3816 | static int io_symlinkat_prep(struct io_kiocb *req, |
| 3817 | const struct io_uring_sqe *sqe) |
| 3818 | { |
| 3819 | struct io_symlink *sl = &req->symlink; |
| 3820 | const char __user *oldpath, *newpath; |
| 3821 | |
| 3822 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 3823 | return -EINVAL; |
| 3824 | if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || |
| 3825 | sqe->splice_fd_in) |
| 3826 | return -EINVAL; |
| 3827 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
| 3828 | return -EBADF; |
| 3829 | |
| 3830 | sl->new_dfd = READ_ONCE(sqe->fd); |
| 3831 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 3832 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
| 3833 | |
| 3834 | sl->oldpath = getname(oldpath); |
| 3835 | if (IS_ERR(sl->oldpath)) |
| 3836 | return PTR_ERR(sl->oldpath); |
| 3837 | |
| 3838 | sl->newpath = getname(newpath); |
| 3839 | if (IS_ERR(sl->newpath)) { |
| 3840 | putname(sl->oldpath); |
| 3841 | return PTR_ERR(sl->newpath); |
| 3842 | } |
| 3843 | |
| 3844 | req->flags |= REQ_F_NEED_CLEANUP; |
| 3845 | return 0; |
| 3846 | } |
| 3847 | |
| 3848 | static int io_symlinkat(struct io_kiocb *req, int issue_flags) |
| 3849 | { |
| 3850 | struct io_symlink *sl = &req->symlink; |
| 3851 | int ret; |
| 3852 | |
| 3853 | if (issue_flags & IO_URING_F_NONBLOCK) |
| 3854 | return -EAGAIN; |
| 3855 | |
| 3856 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); |
| 3857 | |
| 3858 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 3859 | if (ret < 0) |
| 3860 | req_set_fail(req); |
| 3861 | io_req_complete(req, ret); |
| 3862 | return 0; |
| 3863 | } |
| 3864 | |
Dmitry Kadashev | cf30da9 | 2021-07-08 13:34:47 +0700 | [diff] [blame] | 3865 | static int io_linkat_prep(struct io_kiocb *req, |
| 3866 | const struct io_uring_sqe *sqe) |
| 3867 | { |
| 3868 | struct io_hardlink *lnk = &req->hardlink; |
| 3869 | const char __user *oldf, *newf; |
| 3870 | |
| 3871 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 3872 | return -EINVAL; |
| 3873 | if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) |
| 3874 | return -EINVAL; |
| 3875 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
| 3876 | return -EBADF; |
| 3877 | |
| 3878 | lnk->old_dfd = READ_ONCE(sqe->fd); |
| 3879 | lnk->new_dfd = READ_ONCE(sqe->len); |
| 3880 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 3881 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
| 3882 | lnk->flags = READ_ONCE(sqe->hardlink_flags); |
| 3883 | |
| 3884 | lnk->oldpath = getname(oldf); |
| 3885 | if (IS_ERR(lnk->oldpath)) |
| 3886 | return PTR_ERR(lnk->oldpath); |
| 3887 | |
| 3888 | lnk->newpath = getname(newf); |
| 3889 | if (IS_ERR(lnk->newpath)) { |
| 3890 | putname(lnk->oldpath); |
| 3891 | return PTR_ERR(lnk->newpath); |
| 3892 | } |
| 3893 | |
| 3894 | req->flags |= REQ_F_NEED_CLEANUP; |
| 3895 | return 0; |
| 3896 | } |
| 3897 | |
| 3898 | static int io_linkat(struct io_kiocb *req, int issue_flags) |
| 3899 | { |
| 3900 | struct io_hardlink *lnk = &req->hardlink; |
| 3901 | int ret; |
| 3902 | |
| 3903 | if (issue_flags & IO_URING_F_NONBLOCK) |
| 3904 | return -EAGAIN; |
| 3905 | |
| 3906 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, |
| 3907 | lnk->newpath, lnk->flags); |
| 3908 | |
| 3909 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 3910 | if (ret < 0) |
| 3911 | req_set_fail(req); |
| 3912 | io_req_complete(req, ret); |
| 3913 | return 0; |
| 3914 | } |
| 3915 | |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 3916 | static int io_shutdown_prep(struct io_kiocb *req, |
| 3917 | const struct io_uring_sqe *sqe) |
| 3918 | { |
| 3919 | #if defined(CONFIG_NET) |
| 3920 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 3921 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 3922 | if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || |
| 3923 | sqe->buf_index || sqe->splice_fd_in)) |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 3924 | return -EINVAL; |
| 3925 | |
| 3926 | req->shutdown.how = READ_ONCE(sqe->len); |
| 3927 | return 0; |
| 3928 | #else |
| 3929 | return -EOPNOTSUPP; |
| 3930 | #endif |
| 3931 | } |
| 3932 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 3933 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 3934 | { |
| 3935 | #if defined(CONFIG_NET) |
| 3936 | struct socket *sock; |
| 3937 | int ret; |
| 3938 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 3939 | if (issue_flags & IO_URING_F_NONBLOCK) |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 3940 | return -EAGAIN; |
| 3941 | |
Linus Torvalds | 48aba79 | 2020-12-16 12:44:05 -0800 | [diff] [blame] | 3942 | sock = sock_from_file(req->file); |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 3943 | if (unlikely(!sock)) |
Linus Torvalds | 48aba79 | 2020-12-16 12:44:05 -0800 | [diff] [blame] | 3944 | return -ENOTSOCK; |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 3945 | |
| 3946 | ret = __sys_shutdown_sock(sock, req->shutdown.how); |
Jens Axboe | a146468 | 2020-12-14 20:57:27 -0700 | [diff] [blame] | 3947 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 3948 | req_set_fail(req); |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 3949 | io_req_complete(req, ret); |
| 3950 | return 0; |
| 3951 | #else |
| 3952 | return -EOPNOTSUPP; |
| 3953 | #endif |
| 3954 | } |
| 3955 | |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 3956 | static int __io_splice_prep(struct io_kiocb *req, |
| 3957 | const struct io_uring_sqe *sqe) |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 3958 | { |
Pavel Begunkov | fe7e325 | 2021-06-24 15:09:57 +0100 | [diff] [blame] | 3959 | struct io_splice *sp = &req->splice; |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 3960 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 3961 | |
Pavel Begunkov | 3232dd0 | 2020-06-03 18:03:22 +0300 | [diff] [blame] | 3962 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 3963 | return -EINVAL; |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 3964 | |
| 3965 | sp->file_in = NULL; |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 3966 | sp->len = READ_ONCE(sqe->len); |
| 3967 | sp->flags = READ_ONCE(sqe->splice_flags); |
| 3968 | |
| 3969 | if (unlikely(sp->flags & ~valid_flags)) |
| 3970 | return -EINVAL; |
| 3971 | |
Pavel Begunkov | 62906e8 | 2021-08-10 14:52:47 +0100 | [diff] [blame] | 3972 | sp->file_in = io_file_get(req->ctx, req, READ_ONCE(sqe->splice_fd_in), |
Pavel Begunkov | 8371adf | 2020-10-10 18:34:08 +0100 | [diff] [blame] | 3973 | (sp->flags & SPLICE_F_FD_IN_FIXED)); |
| 3974 | if (!sp->file_in) |
| 3975 | return -EBADF; |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 3976 | req->flags |= REQ_F_NEED_CLEANUP; |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 3977 | return 0; |
| 3978 | } |
| 3979 | |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 3980 | static int io_tee_prep(struct io_kiocb *req, |
| 3981 | const struct io_uring_sqe *sqe) |
| 3982 | { |
| 3983 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) |
| 3984 | return -EINVAL; |
| 3985 | return __io_splice_prep(req, sqe); |
| 3986 | } |
| 3987 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 3988 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 3989 | { |
| 3990 | struct io_splice *sp = &req->splice; |
| 3991 | struct file *in = sp->file_in; |
| 3992 | struct file *out = sp->file_out; |
| 3993 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; |
| 3994 | long ret = 0; |
| 3995 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 3996 | if (issue_flags & IO_URING_F_NONBLOCK) |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 3997 | return -EAGAIN; |
| 3998 | if (sp->len) |
| 3999 | ret = do_tee(in, out, sp->len, flags); |
| 4000 | |
Pavel Begunkov | e1d767f | 2021-03-19 17:22:43 +0000 | [diff] [blame] | 4001 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
| 4002 | io_put_file(in); |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 4003 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 4004 | |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 4005 | if (ret != sp->len) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4006 | req_set_fail(req); |
Jens Axboe | e1e1609 | 2020-06-22 09:17:17 -0600 | [diff] [blame] | 4007 | io_req_complete(req, ret); |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 4008 | return 0; |
| 4009 | } |
| 4010 | |
| 4011 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 4012 | { |
Pavel Begunkov | fe7e325 | 2021-06-24 15:09:57 +0100 | [diff] [blame] | 4013 | struct io_splice *sp = &req->splice; |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 4014 | |
| 4015 | sp->off_in = READ_ONCE(sqe->splice_off_in); |
| 4016 | sp->off_out = READ_ONCE(sqe->off); |
| 4017 | return __io_splice_prep(req, sqe); |
| 4018 | } |
| 4019 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4020 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 4021 | { |
| 4022 | struct io_splice *sp = &req->splice; |
| 4023 | struct file *in = sp->file_in; |
| 4024 | struct file *out = sp->file_out; |
| 4025 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; |
| 4026 | loff_t *poff_in, *poff_out; |
Pavel Begunkov | c968742 | 2020-05-04 23:00:54 +0300 | [diff] [blame] | 4027 | long ret = 0; |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 4028 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4029 | if (issue_flags & IO_URING_F_NONBLOCK) |
Pavel Begunkov | 2fb3e82 | 2020-05-01 17:09:38 +0300 | [diff] [blame] | 4030 | return -EAGAIN; |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 4031 | |
| 4032 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; |
| 4033 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; |
Pavel Begunkov | c968742 | 2020-05-04 23:00:54 +0300 | [diff] [blame] | 4034 | |
Jens Axboe | 948a774 | 2020-05-17 14:21:38 -0600 | [diff] [blame] | 4035 | if (sp->len) |
Pavel Begunkov | c968742 | 2020-05-04 23:00:54 +0300 | [diff] [blame] | 4036 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 4037 | |
Pavel Begunkov | e1d767f | 2021-03-19 17:22:43 +0000 | [diff] [blame] | 4038 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
| 4039 | io_put_file(in); |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 4040 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 4041 | |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 4042 | if (ret != sp->len) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4043 | req_set_fail(req); |
Jens Axboe | e1e1609 | 2020-06-22 09:17:17 -0600 | [diff] [blame] | 4044 | io_req_complete(req, ret); |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 4045 | return 0; |
| 4046 | } |
| 4047 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 4048 | /* |
| 4049 | * IORING_OP_NOP just posts a completion event, nothing else. |
| 4050 | */ |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4051 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 4052 | { |
| 4053 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 4054 | |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 4055 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
| 4056 | return -EINVAL; |
| 4057 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4058 | __io_req_complete(req, issue_flags, 0, 0); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 4059 | return 0; |
| 4060 | } |
| 4061 | |
Pavel Begunkov | 1155c76 | 2021-02-18 18:29:38 +0000 | [diff] [blame] | 4062 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Christoph Hellwig | c992fe2 | 2019-01-11 09:43:02 -0700 | [diff] [blame] | 4063 | { |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 4064 | struct io_ring_ctx *ctx = req->ctx; |
Christoph Hellwig | c992fe2 | 2019-01-11 09:43:02 -0700 | [diff] [blame] | 4065 | |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 4066 | if (!req->file) |
| 4067 | return -EBADF; |
Christoph Hellwig | c992fe2 | 2019-01-11 09:43:02 -0700 | [diff] [blame] | 4068 | |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 4069 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 4070 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 4071 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
| 4072 | sqe->splice_fd_in)) |
Christoph Hellwig | c992fe2 | 2019-01-11 09:43:02 -0700 | [diff] [blame] | 4073 | return -EINVAL; |
| 4074 | |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 4075 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
| 4076 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) |
| 4077 | return -EINVAL; |
| 4078 | |
| 4079 | req->sync.off = READ_ONCE(sqe->off); |
| 4080 | req->sync.len = READ_ONCE(sqe->len); |
Christoph Hellwig | c992fe2 | 2019-01-11 09:43:02 -0700 | [diff] [blame] | 4081 | return 0; |
| 4082 | } |
| 4083 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4084 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 7891293 | 2020-01-14 22:09:06 -0700 | [diff] [blame] | 4085 | { |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 4086 | loff_t end = req->sync.off + req->sync.len; |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 4087 | int ret; |
| 4088 | |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 4089 | /* fsync always requires a blocking context */ |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4090 | if (issue_flags & IO_URING_F_NONBLOCK) |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 4091 | return -EAGAIN; |
| 4092 | |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 4093 | ret = vfs_fsync_range(req->file, req->sync.off, |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 4094 | end > 0 ? end : LLONG_MAX, |
| 4095 | req->sync.flags & IORING_FSYNC_DATASYNC); |
| 4096 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4097 | req_set_fail(req); |
Jens Axboe | e1e1609 | 2020-06-22 09:17:17 -0600 | [diff] [blame] | 4098 | io_req_complete(req, ret); |
Christoph Hellwig | c992fe2 | 2019-01-11 09:43:02 -0700 | [diff] [blame] | 4099 | return 0; |
| 4100 | } |
| 4101 | |
Jens Axboe | d63d1b5 | 2019-12-10 10:38:56 -0700 | [diff] [blame] | 4102 | static int io_fallocate_prep(struct io_kiocb *req, |
| 4103 | const struct io_uring_sqe *sqe) |
| 4104 | { |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 4105 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || |
| 4106 | sqe->splice_fd_in) |
Jens Axboe | d63d1b5 | 2019-12-10 10:38:56 -0700 | [diff] [blame] | 4107 | return -EINVAL; |
Pavel Begunkov | 3232dd0 | 2020-06-03 18:03:22 +0300 | [diff] [blame] | 4108 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 4109 | return -EINVAL; |
Jens Axboe | d63d1b5 | 2019-12-10 10:38:56 -0700 | [diff] [blame] | 4110 | |
| 4111 | req->sync.off = READ_ONCE(sqe->off); |
| 4112 | req->sync.len = READ_ONCE(sqe->addr); |
| 4113 | req->sync.mode = READ_ONCE(sqe->len); |
| 4114 | return 0; |
| 4115 | } |
| 4116 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4117 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | d63d1b5 | 2019-12-10 10:38:56 -0700 | [diff] [blame] | 4118 | { |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 4119 | int ret; |
Jens Axboe | d63d1b5 | 2019-12-10 10:38:56 -0700 | [diff] [blame] | 4120 | |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 4121 | /* fallocate always requiring blocking context */ |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4122 | if (issue_flags & IO_URING_F_NONBLOCK) |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 4123 | return -EAGAIN; |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 4124 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
| 4125 | req->sync.len); |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 4126 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4127 | req_set_fail(req); |
Jens Axboe | e1e1609 | 2020-06-22 09:17:17 -0600 | [diff] [blame] | 4128 | io_req_complete(req, ret); |
Jens Axboe | d63d1b5 | 2019-12-10 10:38:56 -0700 | [diff] [blame] | 4129 | return 0; |
| 4130 | } |
| 4131 | |
Pavel Begunkov | ec65fea | 2020-06-03 18:03:24 +0300 | [diff] [blame] | 4132 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4133 | { |
Jens Axboe | f874888 | 2020-01-08 17:47:02 -0700 | [diff] [blame] | 4134 | const char __user *fname; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4135 | int ret; |
| 4136 | |
Pavel Begunkov | d3fddf6 | 2021-08-09 13:04:16 +0100 | [diff] [blame] | 4137 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 4138 | return -EINVAL; |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 4139 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4140 | return -EINVAL; |
Pavel Begunkov | ec65fea | 2020-06-03 18:03:24 +0300 | [diff] [blame] | 4141 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
Jens Axboe | cf3040c | 2020-02-06 21:31:40 -0700 | [diff] [blame] | 4142 | return -EBADF; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4143 | |
Pavel Begunkov | ec65fea | 2020-06-03 18:03:24 +0300 | [diff] [blame] | 4144 | /* open.how should be already initialised */ |
| 4145 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) |
Jens Axboe | 08a1d26eb | 2020-04-08 09:20:54 -0600 | [diff] [blame] | 4146 | req->open.how.flags |= O_LARGEFILE; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4147 | |
Pavel Begunkov | 25e72d1 | 2020-06-03 18:03:23 +0300 | [diff] [blame] | 4148 | req->open.dfd = READ_ONCE(sqe->fd); |
| 4149 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
Jens Axboe | f874888 | 2020-01-08 17:47:02 -0700 | [diff] [blame] | 4150 | req->open.filename = getname(fname); |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4151 | if (IS_ERR(req->open.filename)) { |
| 4152 | ret = PTR_ERR(req->open.filename); |
| 4153 | req->open.filename = NULL; |
| 4154 | return ret; |
| 4155 | } |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 4156 | |
| 4157 | req->open.file_slot = READ_ONCE(sqe->file_index); |
| 4158 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) |
| 4159 | return -EINVAL; |
| 4160 | |
Jens Axboe | 4022e7a | 2020-03-19 19:23:18 -0600 | [diff] [blame] | 4161 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
Pavel Begunkov | 8fef80b | 2020-02-07 23:59:53 +0300 | [diff] [blame] | 4162 | req->flags |= REQ_F_NEED_CLEANUP; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4163 | return 0; |
| 4164 | } |
| 4165 | |
Pavel Begunkov | ec65fea | 2020-06-03 18:03:24 +0300 | [diff] [blame] | 4166 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 4167 | { |
Pavel Begunkov | d3fddf6 | 2021-08-09 13:04:16 +0100 | [diff] [blame] | 4168 | u64 mode = READ_ONCE(sqe->len); |
| 4169 | u64 flags = READ_ONCE(sqe->open_flags); |
Pavel Begunkov | ec65fea | 2020-06-03 18:03:24 +0300 | [diff] [blame] | 4170 | |
Pavel Begunkov | ec65fea | 2020-06-03 18:03:24 +0300 | [diff] [blame] | 4171 | req->open.how = build_open_how(flags, mode); |
| 4172 | return __io_openat_prep(req, sqe); |
| 4173 | } |
| 4174 | |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 4175 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 4176 | { |
| 4177 | struct open_how __user *how; |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 4178 | size_t len; |
| 4179 | int ret; |
| 4180 | |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 4181 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
| 4182 | len = READ_ONCE(sqe->len); |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 4183 | if (len < OPEN_HOW_SIZE_VER0) |
| 4184 | return -EINVAL; |
| 4185 | |
| 4186 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
| 4187 | len); |
| 4188 | if (ret) |
| 4189 | return ret; |
| 4190 | |
Pavel Begunkov | ec65fea | 2020-06-03 18:03:24 +0300 | [diff] [blame] | 4191 | return __io_openat_prep(req, sqe); |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 4192 | } |
| 4193 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4194 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4195 | { |
| 4196 | struct open_flags op; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4197 | struct file *file; |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 4198 | bool resolve_nonblock, nonblock_set; |
| 4199 | bool fixed = !!req->open.file_slot; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4200 | int ret; |
| 4201 | |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 4202 | ret = build_open_flags(&req->open.how, &op); |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4203 | if (ret) |
| 4204 | goto err; |
Jens Axboe | 3a81fd0 | 2020-12-10 12:25:36 -0700 | [diff] [blame] | 4205 | nonblock_set = op.open_flag & O_NONBLOCK; |
| 4206 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4207 | if (issue_flags & IO_URING_F_NONBLOCK) { |
Jens Axboe | 3a81fd0 | 2020-12-10 12:25:36 -0700 | [diff] [blame] | 4208 | /* |
| 4209 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, |
| 4210 | * it'll always -EAGAIN |
| 4211 | */ |
| 4212 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) |
| 4213 | return -EAGAIN; |
| 4214 | op.lookup_flags |= LOOKUP_CACHED; |
| 4215 | op.open_flag |= O_NONBLOCK; |
| 4216 | } |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4217 | |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 4218 | if (!fixed) { |
| 4219 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
| 4220 | if (ret < 0) |
| 4221 | goto err; |
| 4222 | } |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4223 | |
| 4224 | file = do_filp_open(req->open.dfd, req->open.filename, &op); |
Pavel Begunkov | 12dcb58a | 2021-06-24 15:10:00 +0100 | [diff] [blame] | 4225 | if (IS_ERR(file)) { |
Jens Axboe | 3a81fd0 | 2020-12-10 12:25:36 -0700 | [diff] [blame] | 4226 | /* |
Pavel Begunkov | 12dcb58a | 2021-06-24 15:10:00 +0100 | [diff] [blame] | 4227 | * We could hang on to this 'fd' on retrying, but seems like |
| 4228 | * marginal gain for something that is now known to be a slower |
| 4229 | * path. So just put it, and we'll get a new one when we retry. |
Jens Axboe | 3a81fd0 | 2020-12-10 12:25:36 -0700 | [diff] [blame] | 4230 | */ |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 4231 | if (!fixed) |
| 4232 | put_unused_fd(ret); |
Pavel Begunkov | 12dcb58a | 2021-06-24 15:10:00 +0100 | [diff] [blame] | 4233 | |
| 4234 | ret = PTR_ERR(file); |
| 4235 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
| 4236 | if (ret == -EAGAIN && |
| 4237 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) |
| 4238 | return -EAGAIN; |
| 4239 | goto err; |
Jens Axboe | 3a81fd0 | 2020-12-10 12:25:36 -0700 | [diff] [blame] | 4240 | } |
| 4241 | |
Pavel Begunkov | 12dcb58a | 2021-06-24 15:10:00 +0100 | [diff] [blame] | 4242 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) |
| 4243 | file->f_flags &= ~O_NONBLOCK; |
| 4244 | fsnotify_open(file); |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 4245 | |
| 4246 | if (!fixed) |
| 4247 | fd_install(ret, file); |
| 4248 | else |
| 4249 | ret = io_install_fixed_file(req, file, issue_flags, |
| 4250 | req->open.file_slot - 1); |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4251 | err: |
| 4252 | putname(req->open.filename); |
Pavel Begunkov | 8fef80b | 2020-02-07 23:59:53 +0300 | [diff] [blame] | 4253 | req->flags &= ~REQ_F_NEED_CLEANUP; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4254 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4255 | req_set_fail(req); |
Pavel Begunkov | 0bdf339 | 2021-04-11 01:46:29 +0100 | [diff] [blame] | 4256 | __io_req_complete(req, issue_flags, ret, 0); |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 4257 | return 0; |
| 4258 | } |
| 4259 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4260 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 4261 | { |
Pavel Begunkov | e45cff5 | 2021-02-28 22:35:14 +0000 | [diff] [blame] | 4262 | return io_openat2(req, issue_flags); |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 4263 | } |
| 4264 | |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 4265 | static int io_remove_buffers_prep(struct io_kiocb *req, |
| 4266 | const struct io_uring_sqe *sqe) |
| 4267 | { |
| 4268 | struct io_provide_buf *p = &req->pbuf; |
| 4269 | u64 tmp; |
| 4270 | |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 4271 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
| 4272 | sqe->splice_fd_in) |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 4273 | return -EINVAL; |
| 4274 | |
| 4275 | tmp = READ_ONCE(sqe->fd); |
| 4276 | if (!tmp || tmp > USHRT_MAX) |
| 4277 | return -EINVAL; |
| 4278 | |
| 4279 | memset(p, 0, sizeof(*p)); |
| 4280 | p->nbufs = tmp; |
| 4281 | p->bgid = READ_ONCE(sqe->buf_group); |
| 4282 | return 0; |
| 4283 | } |
| 4284 | |
| 4285 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, |
| 4286 | int bgid, unsigned nbufs) |
| 4287 | { |
| 4288 | unsigned i = 0; |
| 4289 | |
| 4290 | /* shouldn't happen */ |
| 4291 | if (!nbufs) |
| 4292 | return 0; |
| 4293 | |
| 4294 | /* the head kbuf is the list itself */ |
| 4295 | while (!list_empty(&buf->list)) { |
| 4296 | struct io_buffer *nxt; |
| 4297 | |
| 4298 | nxt = list_first_entry(&buf->list, struct io_buffer, list); |
| 4299 | list_del(&nxt->list); |
| 4300 | kfree(nxt); |
| 4301 | if (++i == nbufs) |
| 4302 | return i; |
| 4303 | } |
| 4304 | i++; |
| 4305 | kfree(buf); |
Jens Axboe | 9e15c3a | 2021-03-13 12:29:43 -0700 | [diff] [blame] | 4306 | xa_erase(&ctx->io_buffers, bgid); |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 4307 | |
| 4308 | return i; |
| 4309 | } |
| 4310 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4311 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 4312 | { |
| 4313 | struct io_provide_buf *p = &req->pbuf; |
| 4314 | struct io_ring_ctx *ctx = req->ctx; |
| 4315 | struct io_buffer *head; |
| 4316 | int ret = 0; |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4317 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 4318 | |
| 4319 | io_ring_submit_lock(ctx, !force_nonblock); |
| 4320 | |
| 4321 | lockdep_assert_held(&ctx->uring_lock); |
| 4322 | |
| 4323 | ret = -ENOENT; |
Jens Axboe | 9e15c3a | 2021-03-13 12:29:43 -0700 | [diff] [blame] | 4324 | head = xa_load(&ctx->io_buffers, p->bgid); |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 4325 | if (head) |
| 4326 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 4327 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4328 | req_set_fail(req); |
Pavel Begunkov | 31bff9a | 2020-12-06 22:22:43 +0000 | [diff] [blame] | 4329 | |
Pavel Begunkov | 9fb8cb4 | 2021-02-28 22:35:13 +0000 | [diff] [blame] | 4330 | /* complete before unlock, IOPOLL may need the lock */ |
| 4331 | __io_req_complete(req, issue_flags, ret, 0); |
| 4332 | io_ring_submit_unlock(ctx, !force_nonblock); |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 4333 | return 0; |
| 4334 | } |
| 4335 | |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4336 | static int io_provide_buffers_prep(struct io_kiocb *req, |
| 4337 | const struct io_uring_sqe *sqe) |
| 4338 | { |
Pavel Begunkov | 38134ad | 2021-04-15 13:07:39 +0100 | [diff] [blame] | 4339 | unsigned long size, tmp_check; |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4340 | struct io_provide_buf *p = &req->pbuf; |
| 4341 | u64 tmp; |
| 4342 | |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 4343 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4344 | return -EINVAL; |
| 4345 | |
| 4346 | tmp = READ_ONCE(sqe->fd); |
| 4347 | if (!tmp || tmp > USHRT_MAX) |
| 4348 | return -E2BIG; |
| 4349 | p->nbufs = tmp; |
| 4350 | p->addr = READ_ONCE(sqe->addr); |
| 4351 | p->len = READ_ONCE(sqe->len); |
| 4352 | |
Pavel Begunkov | 38134ad | 2021-04-15 13:07:39 +0100 | [diff] [blame] | 4353 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
| 4354 | &size)) |
| 4355 | return -EOVERFLOW; |
| 4356 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) |
| 4357 | return -EOVERFLOW; |
| 4358 | |
Pavel Begunkov | d81269f | 2021-03-19 10:21:19 +0000 | [diff] [blame] | 4359 | size = (unsigned long)p->len * p->nbufs; |
| 4360 | if (!access_ok(u64_to_user_ptr(p->addr), size)) |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4361 | return -EFAULT; |
| 4362 | |
| 4363 | p->bgid = READ_ONCE(sqe->buf_group); |
| 4364 | tmp = READ_ONCE(sqe->off); |
| 4365 | if (tmp > USHRT_MAX) |
| 4366 | return -E2BIG; |
| 4367 | p->bid = tmp; |
| 4368 | return 0; |
| 4369 | } |
| 4370 | |
| 4371 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) |
| 4372 | { |
| 4373 | struct io_buffer *buf; |
| 4374 | u64 addr = pbuf->addr; |
| 4375 | int i, bid = pbuf->bid; |
| 4376 | |
| 4377 | for (i = 0; i < pbuf->nbufs; i++) { |
| 4378 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); |
| 4379 | if (!buf) |
| 4380 | break; |
| 4381 | |
| 4382 | buf->addr = addr; |
Thadeu Lima de Souza Cascardo | d1f8280 | 2021-05-05 09:47:06 -0300 | [diff] [blame] | 4383 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4384 | buf->bid = bid; |
| 4385 | addr += pbuf->len; |
| 4386 | bid++; |
| 4387 | if (!*head) { |
| 4388 | INIT_LIST_HEAD(&buf->list); |
| 4389 | *head = buf; |
| 4390 | } else { |
| 4391 | list_add_tail(&buf->list, &(*head)->list); |
| 4392 | } |
| 4393 | } |
| 4394 | |
| 4395 | return i ? i : -ENOMEM; |
| 4396 | } |
| 4397 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4398 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4399 | { |
| 4400 | struct io_provide_buf *p = &req->pbuf; |
| 4401 | struct io_ring_ctx *ctx = req->ctx; |
| 4402 | struct io_buffer *head, *list; |
| 4403 | int ret = 0; |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4404 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4405 | |
| 4406 | io_ring_submit_lock(ctx, !force_nonblock); |
| 4407 | |
| 4408 | lockdep_assert_held(&ctx->uring_lock); |
| 4409 | |
Jens Axboe | 9e15c3a | 2021-03-13 12:29:43 -0700 | [diff] [blame] | 4410 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4411 | |
| 4412 | ret = io_add_buffers(p, &head); |
Jens Axboe | 9e15c3a | 2021-03-13 12:29:43 -0700 | [diff] [blame] | 4413 | if (ret >= 0 && !list) { |
| 4414 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); |
| 4415 | if (ret < 0) |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 4416 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4417 | } |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4418 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4419 | req_set_fail(req); |
Pavel Begunkov | 9fb8cb4 | 2021-02-28 22:35:13 +0000 | [diff] [blame] | 4420 | /* complete before unlock, IOPOLL may need the lock */ |
| 4421 | __io_req_complete(req, issue_flags, ret, 0); |
| 4422 | io_ring_submit_unlock(ctx, !force_nonblock); |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 4423 | return 0; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 4424 | } |
| 4425 | |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 4426 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
| 4427 | const struct io_uring_sqe *sqe) |
| 4428 | { |
| 4429 | #if defined(CONFIG_EPOLL) |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 4430 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 4431 | return -EINVAL; |
Pavel Begunkov | 2d74d04 | 2021-05-14 12:05:46 +0100 | [diff] [blame] | 4432 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
Pavel Begunkov | 3232dd0 | 2020-06-03 18:03:22 +0300 | [diff] [blame] | 4433 | return -EINVAL; |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 4434 | |
| 4435 | req->epoll.epfd = READ_ONCE(sqe->fd); |
| 4436 | req->epoll.op = READ_ONCE(sqe->len); |
| 4437 | req->epoll.fd = READ_ONCE(sqe->off); |
| 4438 | |
| 4439 | if (ep_op_has_event(req->epoll.op)) { |
| 4440 | struct epoll_event __user *ev; |
| 4441 | |
| 4442 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 4443 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) |
| 4444 | return -EFAULT; |
| 4445 | } |
| 4446 | |
| 4447 | return 0; |
| 4448 | #else |
| 4449 | return -EOPNOTSUPP; |
| 4450 | #endif |
| 4451 | } |
| 4452 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4453 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 4454 | { |
| 4455 | #if defined(CONFIG_EPOLL) |
| 4456 | struct io_epoll *ie = &req->epoll; |
| 4457 | int ret; |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4458 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 4459 | |
| 4460 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); |
| 4461 | if (force_nonblock && ret == -EAGAIN) |
| 4462 | return -EAGAIN; |
| 4463 | |
| 4464 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4465 | req_set_fail(req); |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4466 | __io_req_complete(req, issue_flags, ret, 0); |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 4467 | return 0; |
| 4468 | #else |
| 4469 | return -EOPNOTSUPP; |
| 4470 | #endif |
| 4471 | } |
| 4472 | |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 4473 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 4474 | { |
| 4475 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 4476 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 4477 | return -EINVAL; |
Pavel Begunkov | 3232dd0 | 2020-06-03 18:03:22 +0300 | [diff] [blame] | 4478 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 4479 | return -EINVAL; |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 4480 | |
| 4481 | req->madvise.addr = READ_ONCE(sqe->addr); |
| 4482 | req->madvise.len = READ_ONCE(sqe->len); |
| 4483 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); |
| 4484 | return 0; |
| 4485 | #else |
| 4486 | return -EOPNOTSUPP; |
| 4487 | #endif |
| 4488 | } |
| 4489 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4490 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 4491 | { |
| 4492 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) |
| 4493 | struct io_madvise *ma = &req->madvise; |
| 4494 | int ret; |
| 4495 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4496 | if (issue_flags & IO_URING_F_NONBLOCK) |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 4497 | return -EAGAIN; |
| 4498 | |
Minchan Kim | 0726b01 | 2020-10-17 16:14:50 -0700 | [diff] [blame] | 4499 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 4500 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4501 | req_set_fail(req); |
Jens Axboe | e1e1609 | 2020-06-22 09:17:17 -0600 | [diff] [blame] | 4502 | io_req_complete(req, ret); |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 4503 | return 0; |
| 4504 | #else |
| 4505 | return -EOPNOTSUPP; |
| 4506 | #endif |
| 4507 | } |
| 4508 | |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 4509 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 4510 | { |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 4511 | if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 4512 | return -EINVAL; |
Pavel Begunkov | 3232dd0 | 2020-06-03 18:03:22 +0300 | [diff] [blame] | 4513 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 4514 | return -EINVAL; |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 4515 | |
| 4516 | req->fadvise.offset = READ_ONCE(sqe->off); |
| 4517 | req->fadvise.len = READ_ONCE(sqe->len); |
| 4518 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); |
| 4519 | return 0; |
| 4520 | } |
| 4521 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4522 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 4523 | { |
| 4524 | struct io_fadvise *fa = &req->fadvise; |
| 4525 | int ret; |
| 4526 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4527 | if (issue_flags & IO_URING_F_NONBLOCK) { |
Jens Axboe | 3e69426 | 2020-02-01 09:22:49 -0700 | [diff] [blame] | 4528 | switch (fa->advice) { |
| 4529 | case POSIX_FADV_NORMAL: |
| 4530 | case POSIX_FADV_RANDOM: |
| 4531 | case POSIX_FADV_SEQUENTIAL: |
| 4532 | break; |
| 4533 | default: |
| 4534 | return -EAGAIN; |
| 4535 | } |
| 4536 | } |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 4537 | |
| 4538 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); |
| 4539 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4540 | req_set_fail(req); |
Pavel Begunkov | 0bdf339 | 2021-04-11 01:46:29 +0100 | [diff] [blame] | 4541 | __io_req_complete(req, issue_flags, ret, 0); |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 4542 | return 0; |
| 4543 | } |
| 4544 | |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4545 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 4546 | { |
Pavel Begunkov | 2d74d04 | 2021-05-14 12:05:46 +0100 | [diff] [blame] | 4547 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
Pavel Begunkov | 3232dd0 | 2020-06-03 18:03:22 +0300 | [diff] [blame] | 4548 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 4549 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4550 | return -EINVAL; |
Pavel Begunkov | 9c280f9 | 2020-04-08 08:58:46 +0300 | [diff] [blame] | 4551 | if (req->flags & REQ_F_FIXED_FILE) |
Jens Axboe | cf3040c | 2020-02-06 21:31:40 -0700 | [diff] [blame] | 4552 | return -EBADF; |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4553 | |
Bijan Mottahedeh | 1d9e128 | 2020-05-22 21:31:16 -0700 | [diff] [blame] | 4554 | req->statx.dfd = READ_ONCE(sqe->fd); |
| 4555 | req->statx.mask = READ_ONCE(sqe->len); |
Bijan Mottahedeh | e62753e | 2020-05-22 21:31:18 -0700 | [diff] [blame] | 4556 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
Bijan Mottahedeh | 1d9e128 | 2020-05-22 21:31:16 -0700 | [diff] [blame] | 4557 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
| 4558 | req->statx.flags = READ_ONCE(sqe->statx_flags); |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4559 | |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4560 | return 0; |
| 4561 | } |
| 4562 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4563 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4564 | { |
Bijan Mottahedeh | 1d9e128 | 2020-05-22 21:31:16 -0700 | [diff] [blame] | 4565 | struct io_statx *ctx = &req->statx; |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4566 | int ret; |
| 4567 | |
Pavel Begunkov | 59d7001 | 2021-03-22 01:58:30 +0000 | [diff] [blame] | 4568 | if (issue_flags & IO_URING_F_NONBLOCK) |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4569 | return -EAGAIN; |
| 4570 | |
Bijan Mottahedeh | e62753e | 2020-05-22 21:31:18 -0700 | [diff] [blame] | 4571 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
| 4572 | ctx->buffer); |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4573 | |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4574 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4575 | req_set_fail(req); |
Jens Axboe | e1e1609 | 2020-06-22 09:17:17 -0600 | [diff] [blame] | 4576 | io_req_complete(req, ret); |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 4577 | return 0; |
| 4578 | } |
| 4579 | |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 4580 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 4581 | { |
Jens Axboe | 14587a46 | 2020-09-05 11:36:08 -0600 | [diff] [blame] | 4582 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
Pavel Begunkov | 3232dd0 | 2020-06-03 18:03:22 +0300 | [diff] [blame] | 4583 | return -EINVAL; |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 4584 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 4585 | sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 4586 | return -EINVAL; |
Pavel Begunkov | 9c280f9 | 2020-04-08 08:58:46 +0300 | [diff] [blame] | 4587 | if (req->flags & REQ_F_FIXED_FILE) |
Jens Axboe | cf3040c | 2020-02-06 21:31:40 -0700 | [diff] [blame] | 4588 | return -EBADF; |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 4589 | |
| 4590 | req->close.fd = READ_ONCE(sqe->fd); |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 4591 | return 0; |
| 4592 | } |
| 4593 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4594 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 4595 | { |
Jens Axboe | 9eac190 | 2021-01-19 15:50:37 -0700 | [diff] [blame] | 4596 | struct files_struct *files = current->files; |
Pavel Begunkov | 3af73b2 | 2020-06-08 21:08:17 +0300 | [diff] [blame] | 4597 | struct io_close *close = &req->close; |
Jens Axboe | 9eac190 | 2021-01-19 15:50:37 -0700 | [diff] [blame] | 4598 | struct fdtable *fdt; |
Pavel Begunkov | a1fde92 | 2021-04-11 01:46:28 +0100 | [diff] [blame] | 4599 | struct file *file = NULL; |
| 4600 | int ret = -EBADF; |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 4601 | |
Jens Axboe | 9eac190 | 2021-01-19 15:50:37 -0700 | [diff] [blame] | 4602 | spin_lock(&files->file_lock); |
| 4603 | fdt = files_fdtable(files); |
| 4604 | if (close->fd >= fdt->max_fds) { |
| 4605 | spin_unlock(&files->file_lock); |
| 4606 | goto err; |
| 4607 | } |
| 4608 | file = fdt->fd[close->fd]; |
Pavel Begunkov | a1fde92 | 2021-04-11 01:46:28 +0100 | [diff] [blame] | 4609 | if (!file || file->f_op == &io_uring_fops) { |
Jens Axboe | 9eac190 | 2021-01-19 15:50:37 -0700 | [diff] [blame] | 4610 | spin_unlock(&files->file_lock); |
| 4611 | file = NULL; |
| 4612 | goto err; |
Pavel Begunkov | 3af73b2 | 2020-06-08 21:08:17 +0300 | [diff] [blame] | 4613 | } |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 4614 | |
| 4615 | /* if the file has a flush method, be safe and punt to async */ |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4616 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
Jens Axboe | 9eac190 | 2021-01-19 15:50:37 -0700 | [diff] [blame] | 4617 | spin_unlock(&files->file_lock); |
Pavel Begunkov | 0bf0eef | 2020-05-26 20:34:06 +0300 | [diff] [blame] | 4618 | return -EAGAIN; |
Pavel Begunkov | a210067 | 2020-03-02 23:45:16 +0300 | [diff] [blame] | 4619 | } |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 4620 | |
Jens Axboe | 9eac190 | 2021-01-19 15:50:37 -0700 | [diff] [blame] | 4621 | ret = __close_fd_get_file(close->fd, &file); |
| 4622 | spin_unlock(&files->file_lock); |
| 4623 | if (ret < 0) { |
| 4624 | if (ret == -ENOENT) |
| 4625 | ret = -EBADF; |
| 4626 | goto err; |
| 4627 | } |
| 4628 | |
Pavel Begunkov | 3af73b2 | 2020-06-08 21:08:17 +0300 | [diff] [blame] | 4629 | /* No ->flush() or already async, safely close from here */ |
Jens Axboe | 9eac190 | 2021-01-19 15:50:37 -0700 | [diff] [blame] | 4630 | ret = filp_close(file, current->files); |
| 4631 | err: |
Pavel Begunkov | 3af73b2 | 2020-06-08 21:08:17 +0300 | [diff] [blame] | 4632 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4633 | req_set_fail(req); |
Jens Axboe | 9eac190 | 2021-01-19 15:50:37 -0700 | [diff] [blame] | 4634 | if (file) |
| 4635 | fput(file); |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4636 | __io_req_complete(req, issue_flags, ret, 0); |
Jens Axboe | 1a417f4 | 2020-01-31 17:16:48 -0700 | [diff] [blame] | 4637 | return 0; |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 4638 | } |
| 4639 | |
Pavel Begunkov | 1155c76 | 2021-02-18 18:29:38 +0000 | [diff] [blame] | 4640 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Jens Axboe | 5d17b4a | 2019-04-09 14:56:44 -0600 | [diff] [blame] | 4641 | { |
| 4642 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 5d17b4a | 2019-04-09 14:56:44 -0600 | [diff] [blame] | 4643 | |
Jens Axboe | 5d17b4a | 2019-04-09 14:56:44 -0600 | [diff] [blame] | 4644 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
| 4645 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 4646 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
| 4647 | sqe->splice_fd_in)) |
Jens Axboe | 5d17b4a | 2019-04-09 14:56:44 -0600 | [diff] [blame] | 4648 | return -EINVAL; |
| 4649 | |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 4650 | req->sync.off = READ_ONCE(sqe->off); |
| 4651 | req->sync.len = READ_ONCE(sqe->len); |
| 4652 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 4653 | return 0; |
| 4654 | } |
| 4655 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4656 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 4657 | { |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 4658 | int ret; |
| 4659 | |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 4660 | /* sync_file_range always requires a blocking context */ |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4661 | if (issue_flags & IO_URING_F_NONBLOCK) |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 4662 | return -EAGAIN; |
| 4663 | |
Jens Axboe | 9adbd45 | 2019-12-20 08:45:55 -0700 | [diff] [blame] | 4664 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 4665 | req->sync.flags); |
| 4666 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4667 | req_set_fail(req); |
Jens Axboe | e1e1609 | 2020-06-22 09:17:17 -0600 | [diff] [blame] | 4668 | io_req_complete(req, ret); |
Jens Axboe | 5d17b4a | 2019-04-09 14:56:44 -0600 | [diff] [blame] | 4669 | return 0; |
| 4670 | } |
| 4671 | |
YueHaibing | 469956e | 2020-03-04 15:53:52 +0800 | [diff] [blame] | 4672 | #if defined(CONFIG_NET) |
Pavel Begunkov | 02d27d8 | 2020-02-28 10:36:36 +0300 | [diff] [blame] | 4673 | static int io_setup_async_msg(struct io_kiocb *req, |
| 4674 | struct io_async_msghdr *kmsg) |
| 4675 | { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 4676 | struct io_async_msghdr *async_msg = req->async_data; |
| 4677 | |
| 4678 | if (async_msg) |
Pavel Begunkov | 02d27d8 | 2020-02-28 10:36:36 +0300 | [diff] [blame] | 4679 | return -EAGAIN; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 4680 | if (io_alloc_async_data(req)) { |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4681 | kfree(kmsg->free_iov); |
Pavel Begunkov | 02d27d8 | 2020-02-28 10:36:36 +0300 | [diff] [blame] | 4682 | return -ENOMEM; |
| 4683 | } |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 4684 | async_msg = req->async_data; |
Pavel Begunkov | 02d27d8 | 2020-02-28 10:36:36 +0300 | [diff] [blame] | 4685 | req->flags |= REQ_F_NEED_CLEANUP; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 4686 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
Pavel Begunkov | 2a78080 | 2021-02-05 00:57:58 +0000 | [diff] [blame] | 4687 | async_msg->msg.msg_name = &async_msg->addr; |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4688 | /* if were using fast_iov, set it to the new one */ |
| 4689 | if (!async_msg->free_iov) |
| 4690 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; |
| 4691 | |
Pavel Begunkov | 02d27d8 | 2020-02-28 10:36:36 +0300 | [diff] [blame] | 4692 | return -EAGAIN; |
| 4693 | } |
| 4694 | |
Pavel Begunkov | 2ae523e | 2020-07-12 20:41:06 +0300 | [diff] [blame] | 4695 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
| 4696 | struct io_async_msghdr *iomsg) |
| 4697 | { |
Pavel Begunkov | 2ae523e | 2020-07-12 20:41:06 +0300 | [diff] [blame] | 4698 | iomsg->msg.msg_name = &iomsg->addr; |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4699 | iomsg->free_iov = iomsg->fast_iov; |
Pavel Begunkov | 2ae523e | 2020-07-12 20:41:06 +0300 | [diff] [blame] | 4700 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4701 | req->sr_msg.msg_flags, &iomsg->free_iov); |
Pavel Begunkov | 2ae523e | 2020-07-12 20:41:06 +0300 | [diff] [blame] | 4702 | } |
| 4703 | |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 4704 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
| 4705 | { |
| 4706 | int ret; |
| 4707 | |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 4708 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
| 4709 | if (!ret) |
| 4710 | req->flags |= REQ_F_NEED_CLEANUP; |
| 4711 | return ret; |
| 4712 | } |
| 4713 | |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 4714 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Jens Axboe | aa1fa28 | 2019-04-19 13:38:09 -0600 | [diff] [blame] | 4715 | { |
Jens Axboe | e47293f | 2019-12-20 08:58:21 -0700 | [diff] [blame] | 4716 | struct io_sr_msg *sr = &req->sr_msg; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4717 | |
Pavel Begunkov | d2b6f48 | 2020-06-03 18:03:25 +0300 | [diff] [blame] | 4718 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 4719 | return -EINVAL; |
| 4720 | |
Pavel Begunkov | 270a594 | 2020-07-12 20:41:04 +0300 | [diff] [blame] | 4721 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 4722 | sr->len = READ_ONCE(sqe->len); |
Pavel Begunkov | 0441180 | 2021-04-01 15:44:00 +0100 | [diff] [blame] | 4723 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
| 4724 | if (sr->msg_flags & MSG_DONTWAIT) |
| 4725 | req->flags |= REQ_F_NOWAIT; |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 4726 | |
Jens Axboe | d876836 | 2020-02-27 14:17:49 -0700 | [diff] [blame] | 4727 | #ifdef CONFIG_COMPAT |
| 4728 | if (req->ctx->compat) |
| 4729 | sr->msg_flags |= MSG_CMSG_COMPAT; |
| 4730 | #endif |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 4731 | return 0; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4732 | } |
| 4733 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4734 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4735 | { |
Pavel Begunkov | 6b754c8 | 2020-07-16 23:28:00 +0300 | [diff] [blame] | 4736 | struct io_async_msghdr iomsg, *kmsg; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4737 | struct socket *sock; |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4738 | unsigned flags; |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 4739 | int min_ret = 0; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4740 | int ret; |
| 4741 | |
Florent Revest | dba4a92 | 2020-12-04 12:36:04 +0100 | [diff] [blame] | 4742 | sock = sock_from_file(req->file); |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4743 | if (unlikely(!sock)) |
Florent Revest | dba4a92 | 2020-12-04 12:36:04 +0100 | [diff] [blame] | 4744 | return -ENOTSOCK; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4745 | |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4746 | kmsg = req->async_data; |
| 4747 | if (!kmsg) { |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4748 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 4749 | if (ret) |
| 4750 | return ret; |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4751 | kmsg = &iomsg; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 4752 | } |
| 4753 | |
Pavel Begunkov | 0441180 | 2021-04-01 15:44:00 +0100 | [diff] [blame] | 4754 | flags = req->sr_msg.msg_flags; |
| 4755 | if (issue_flags & IO_URING_F_NONBLOCK) |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4756 | flags |= MSG_DONTWAIT; |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 4757 | if (flags & MSG_WAITALL) |
| 4758 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); |
| 4759 | |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4760 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4761 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4762 | return io_setup_async_msg(req, kmsg); |
| 4763 | if (ret == -ERESTARTSYS) |
| 4764 | ret = -EINTR; |
| 4765 | |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4766 | /* fast path, check for non-NULL to avoid function call */ |
| 4767 | if (kmsg->free_iov) |
| 4768 | kfree(kmsg->free_iov); |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4769 | req->flags &= ~REQ_F_NEED_CLEANUP; |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 4770 | if (ret < min_ret) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4771 | req_set_fail(req); |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4772 | __io_req_complete(req, issue_flags, ret, 0); |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 4773 | return 0; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 4774 | } |
| 4775 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4776 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4777 | { |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4778 | struct io_sr_msg *sr = &req->sr_msg; |
| 4779 | struct msghdr msg; |
| 4780 | struct iovec iov; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4781 | struct socket *sock; |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4782 | unsigned flags; |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 4783 | int min_ret = 0; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4784 | int ret; |
| 4785 | |
Florent Revest | dba4a92 | 2020-12-04 12:36:04 +0100 | [diff] [blame] | 4786 | sock = sock_from_file(req->file); |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4787 | if (unlikely(!sock)) |
Florent Revest | dba4a92 | 2020-12-04 12:36:04 +0100 | [diff] [blame] | 4788 | return -ENOTSOCK; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4789 | |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4790 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
| 4791 | if (unlikely(ret)) |
Zheng Bin | 14db841 | 2020-09-09 20:12:37 +0800 | [diff] [blame] | 4792 | return ret; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4793 | |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4794 | msg.msg_name = NULL; |
| 4795 | msg.msg_control = NULL; |
| 4796 | msg.msg_controllen = 0; |
| 4797 | msg.msg_namelen = 0; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4798 | |
Pavel Begunkov | 0441180 | 2021-04-01 15:44:00 +0100 | [diff] [blame] | 4799 | flags = req->sr_msg.msg_flags; |
| 4800 | if (issue_flags & IO_URING_F_NONBLOCK) |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4801 | flags |= MSG_DONTWAIT; |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 4802 | if (flags & MSG_WAITALL) |
| 4803 | min_ret = iov_iter_count(&msg.msg_iter); |
| 4804 | |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4805 | msg.msg_flags = flags; |
| 4806 | ret = sock_sendmsg(sock, &msg); |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4807 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4808 | return -EAGAIN; |
| 4809 | if (ret == -ERESTARTSYS) |
| 4810 | ret = -EINTR; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4811 | |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 4812 | if (ret < min_ret) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 4813 | req_set_fail(req); |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4814 | __io_req_complete(req, issue_flags, ret, 0); |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4815 | return 0; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4816 | } |
| 4817 | |
Pavel Begunkov | 1400e69 | 2020-07-12 20:41:05 +0300 | [diff] [blame] | 4818 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
| 4819 | struct io_async_msghdr *iomsg) |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4820 | { |
| 4821 | struct io_sr_msg *sr = &req->sr_msg; |
| 4822 | struct iovec __user *uiov; |
| 4823 | size_t iov_len; |
| 4824 | int ret; |
| 4825 | |
Pavel Begunkov | 1400e69 | 2020-07-12 20:41:05 +0300 | [diff] [blame] | 4826 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
| 4827 | &iomsg->uaddr, &uiov, &iov_len); |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4828 | if (ret) |
| 4829 | return ret; |
| 4830 | |
| 4831 | if (req->flags & REQ_F_BUFFER_SELECT) { |
| 4832 | if (iov_len > 1) |
| 4833 | return -EINVAL; |
Pavel Begunkov | 5476dfe | 2021-02-05 00:57:59 +0000 | [diff] [blame] | 4834 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4835 | return -EFAULT; |
Pavel Begunkov | 5476dfe | 2021-02-05 00:57:59 +0000 | [diff] [blame] | 4836 | sr->len = iomsg->fast_iov[0].iov_len; |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4837 | iomsg->free_iov = NULL; |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4838 | } else { |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4839 | iomsg->free_iov = iomsg->fast_iov; |
Christoph Hellwig | 89cd35c | 2020-09-25 06:51:41 +0200 | [diff] [blame] | 4840 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4841 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
Christoph Hellwig | 89cd35c | 2020-09-25 06:51:41 +0200 | [diff] [blame] | 4842 | false); |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4843 | if (ret > 0) |
| 4844 | ret = 0; |
| 4845 | } |
| 4846 | |
| 4847 | return ret; |
| 4848 | } |
| 4849 | |
| 4850 | #ifdef CONFIG_COMPAT |
| 4851 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, |
Pavel Begunkov | 1400e69 | 2020-07-12 20:41:05 +0300 | [diff] [blame] | 4852 | struct io_async_msghdr *iomsg) |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4853 | { |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4854 | struct io_sr_msg *sr = &req->sr_msg; |
| 4855 | struct compat_iovec __user *uiov; |
| 4856 | compat_uptr_t ptr; |
| 4857 | compat_size_t len; |
| 4858 | int ret; |
| 4859 | |
Pavel Begunkov | 4af3417 | 2021-04-11 01:46:30 +0100 | [diff] [blame] | 4860 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
| 4861 | &ptr, &len); |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4862 | if (ret) |
| 4863 | return ret; |
| 4864 | |
| 4865 | uiov = compat_ptr(ptr); |
| 4866 | if (req->flags & REQ_F_BUFFER_SELECT) { |
| 4867 | compat_ssize_t clen; |
| 4868 | |
| 4869 | if (len > 1) |
| 4870 | return -EINVAL; |
| 4871 | if (!access_ok(uiov, sizeof(*uiov))) |
| 4872 | return -EFAULT; |
| 4873 | if (__get_user(clen, &uiov->iov_len)) |
| 4874 | return -EFAULT; |
| 4875 | if (clen < 0) |
| 4876 | return -EINVAL; |
Pavel Begunkov | 2d280bc | 2020-11-29 18:33:32 +0000 | [diff] [blame] | 4877 | sr->len = clen; |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4878 | iomsg->free_iov = NULL; |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4879 | } else { |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4880 | iomsg->free_iov = iomsg->fast_iov; |
Christoph Hellwig | 89cd35c | 2020-09-25 06:51:41 +0200 | [diff] [blame] | 4881 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4882 | UIO_FASTIOV, &iomsg->free_iov, |
Christoph Hellwig | 89cd35c | 2020-09-25 06:51:41 +0200 | [diff] [blame] | 4883 | &iomsg->msg.msg_iter, true); |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4884 | if (ret < 0) |
| 4885 | return ret; |
| 4886 | } |
| 4887 | |
| 4888 | return 0; |
| 4889 | } |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4890 | #endif |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4891 | |
Pavel Begunkov | 1400e69 | 2020-07-12 20:41:05 +0300 | [diff] [blame] | 4892 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
| 4893 | struct io_async_msghdr *iomsg) |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4894 | { |
Pavel Begunkov | 1400e69 | 2020-07-12 20:41:05 +0300 | [diff] [blame] | 4895 | iomsg->msg.msg_name = &iomsg->addr; |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4896 | |
| 4897 | #ifdef CONFIG_COMPAT |
| 4898 | if (req->ctx->compat) |
Pavel Begunkov | 1400e69 | 2020-07-12 20:41:05 +0300 | [diff] [blame] | 4899 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4900 | #endif |
| 4901 | |
Pavel Begunkov | 1400e69 | 2020-07-12 20:41:05 +0300 | [diff] [blame] | 4902 | return __io_recvmsg_copy_hdr(req, iomsg); |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4903 | } |
| 4904 | |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 4905 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
Pavel Begunkov | 7fbb1b5 | 2020-07-16 23:28:05 +0300 | [diff] [blame] | 4906 | bool needs_lock) |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 4907 | { |
| 4908 | struct io_sr_msg *sr = &req->sr_msg; |
| 4909 | struct io_buffer *kbuf; |
| 4910 | |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 4911 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
| 4912 | if (IS_ERR(kbuf)) |
| 4913 | return kbuf; |
| 4914 | |
| 4915 | sr->kbuf = kbuf; |
| 4916 | req->flags |= REQ_F_BUFFER_SELECTED; |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 4917 | return kbuf; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4918 | } |
| 4919 | |
Pavel Begunkov | 7fbb1b5 | 2020-07-16 23:28:05 +0300 | [diff] [blame] | 4920 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
| 4921 | { |
| 4922 | return io_put_kbuf(req, req->sr_msg.kbuf); |
| 4923 | } |
| 4924 | |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 4925 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4926 | { |
Pavel Begunkov | 99bc4c3 | 2020-02-07 22:04:45 +0300 | [diff] [blame] | 4927 | int ret; |
Jens Axboe | 06b76d4 | 2019-12-19 14:44:26 -0700 | [diff] [blame] | 4928 | |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 4929 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
| 4930 | if (!ret) |
| 4931 | req->flags |= REQ_F_NEED_CLEANUP; |
| 4932 | return ret; |
| 4933 | } |
| 4934 | |
| 4935 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 4936 | { |
| 4937 | struct io_sr_msg *sr = &req->sr_msg; |
| 4938 | |
Pavel Begunkov | d2b6f48 | 2020-06-03 18:03:25 +0300 | [diff] [blame] | 4939 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 4940 | return -EINVAL; |
| 4941 | |
Pavel Begunkov | 270a594 | 2020-07-12 20:41:04 +0300 | [diff] [blame] | 4942 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
Jens Axboe | 0b7b21e | 2020-01-31 08:34:59 -0700 | [diff] [blame] | 4943 | sr->len = READ_ONCE(sqe->len); |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 4944 | sr->bgid = READ_ONCE(sqe->buf_group); |
Pavel Begunkov | 0441180 | 2021-04-01 15:44:00 +0100 | [diff] [blame] | 4945 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
| 4946 | if (sr->msg_flags & MSG_DONTWAIT) |
| 4947 | req->flags |= REQ_F_NOWAIT; |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 4948 | |
Jens Axboe | d876836 | 2020-02-27 14:17:49 -0700 | [diff] [blame] | 4949 | #ifdef CONFIG_COMPAT |
| 4950 | if (req->ctx->compat) |
| 4951 | sr->msg_flags |= MSG_CMSG_COMPAT; |
| 4952 | #endif |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 4953 | return 0; |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4954 | } |
| 4955 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 4956 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 4957 | { |
Pavel Begunkov | 6b754c8 | 2020-07-16 23:28:00 +0300 | [diff] [blame] | 4958 | struct io_async_msghdr iomsg, *kmsg; |
Jens Axboe | 0fa03c6 | 2019-04-19 13:34:07 -0600 | [diff] [blame] | 4959 | struct socket *sock; |
Pavel Begunkov | 7fbb1b5 | 2020-07-16 23:28:05 +0300 | [diff] [blame] | 4960 | struct io_buffer *kbuf; |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4961 | unsigned flags; |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 4962 | int min_ret = 0; |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 4963 | int ret, cflags = 0; |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 4964 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
Jens Axboe | 0fa03c6 | 2019-04-19 13:34:07 -0600 | [diff] [blame] | 4965 | |
Florent Revest | dba4a92 | 2020-12-04 12:36:04 +0100 | [diff] [blame] | 4966 | sock = sock_from_file(req->file); |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4967 | if (unlikely(!sock)) |
Florent Revest | dba4a92 | 2020-12-04 12:36:04 +0100 | [diff] [blame] | 4968 | return -ENOTSOCK; |
Jens Axboe | 0fa03c6 | 2019-04-19 13:34:07 -0600 | [diff] [blame] | 4969 | |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 4970 | kmsg = req->async_data; |
| 4971 | if (!kmsg) { |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4972 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
| 4973 | if (ret) |
Pavel Begunkov | 681fda8 | 2020-07-15 22:20:45 +0300 | [diff] [blame] | 4974 | return ret; |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4975 | kmsg = &iomsg; |
Jens Axboe | 0fa03c6 | 2019-04-19 13:34:07 -0600 | [diff] [blame] | 4976 | } |
| 4977 | |
Pavel Begunkov | bc02ef3 | 2020-07-16 23:28:03 +0300 | [diff] [blame] | 4978 | if (req->flags & REQ_F_BUFFER_SELECT) { |
Pavel Begunkov | 7fbb1b5 | 2020-07-16 23:28:05 +0300 | [diff] [blame] | 4979 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
Pavel Begunkov | bc02ef3 | 2020-07-16 23:28:03 +0300 | [diff] [blame] | 4980 | if (IS_ERR(kbuf)) |
| 4981 | return PTR_ERR(kbuf); |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4982 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
Pavel Begunkov | 5476dfe | 2021-02-05 00:57:59 +0000 | [diff] [blame] | 4983 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
| 4984 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4985 | 1, req->sr_msg.len); |
| 4986 | } |
| 4987 | |
Pavel Begunkov | 0441180 | 2021-04-01 15:44:00 +0100 | [diff] [blame] | 4988 | flags = req->sr_msg.msg_flags; |
| 4989 | if (force_nonblock) |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4990 | flags |= MSG_DONTWAIT; |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 4991 | if (flags & MSG_WAITALL) |
| 4992 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); |
| 4993 | |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4994 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
| 4995 | kmsg->uaddr, flags); |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 4996 | if (force_nonblock && ret == -EAGAIN) |
| 4997 | return io_setup_async_msg(req, kmsg); |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 4998 | if (ret == -ERESTARTSYS) |
| 4999 | ret = -EINTR; |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 5000 | |
Pavel Begunkov | 7fbb1b5 | 2020-07-16 23:28:05 +0300 | [diff] [blame] | 5001 | if (req->flags & REQ_F_BUFFER_SELECTED) |
| 5002 | cflags = io_put_recv_kbuf(req); |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 5003 | /* fast path, check for non-NULL to avoid function call */ |
| 5004 | if (kmsg->free_iov) |
| 5005 | kfree(kmsg->free_iov); |
Pavel Begunkov | 99bc4c3 | 2020-02-07 22:04:45 +0300 | [diff] [blame] | 5006 | req->flags &= ~REQ_F_NEED_CLEANUP; |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 5007 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 5008 | req_set_fail(req); |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 5009 | __io_req_complete(req, issue_flags, ret, cflags); |
Jens Axboe | 0fa03c6 | 2019-04-19 13:34:07 -0600 | [diff] [blame] | 5010 | return 0; |
Jens Axboe | 0fa03c6 | 2019-04-19 13:34:07 -0600 | [diff] [blame] | 5011 | } |
| 5012 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 5013 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 5014 | { |
Pavel Begunkov | 6b754c8 | 2020-07-16 23:28:00 +0300 | [diff] [blame] | 5015 | struct io_buffer *kbuf; |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 5016 | struct io_sr_msg *sr = &req->sr_msg; |
| 5017 | struct msghdr msg; |
| 5018 | void __user *buf = sr->buf; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 5019 | struct socket *sock; |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 5020 | struct iovec iov; |
| 5021 | unsigned flags; |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 5022 | int min_ret = 0; |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 5023 | int ret, cflags = 0; |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 5024 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 5025 | |
Florent Revest | dba4a92 | 2020-12-04 12:36:04 +0100 | [diff] [blame] | 5026 | sock = sock_from_file(req->file); |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 5027 | if (unlikely(!sock)) |
Florent Revest | dba4a92 | 2020-12-04 12:36:04 +0100 | [diff] [blame] | 5028 | return -ENOTSOCK; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 5029 | |
Pavel Begunkov | bc02ef3 | 2020-07-16 23:28:03 +0300 | [diff] [blame] | 5030 | if (req->flags & REQ_F_BUFFER_SELECT) { |
Pavel Begunkov | 7fbb1b5 | 2020-07-16 23:28:05 +0300 | [diff] [blame] | 5031 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 5032 | if (IS_ERR(kbuf)) |
| 5033 | return PTR_ERR(kbuf); |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 5034 | buf = u64_to_user_ptr(kbuf->addr); |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 5035 | } |
| 5036 | |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 5037 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
Pavel Begunkov | 14c32ee | 2020-07-16 23:28:01 +0300 | [diff] [blame] | 5038 | if (unlikely(ret)) |
| 5039 | goto out_free; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 5040 | |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 5041 | msg.msg_name = NULL; |
| 5042 | msg.msg_control = NULL; |
| 5043 | msg.msg_controllen = 0; |
| 5044 | msg.msg_namelen = 0; |
| 5045 | msg.msg_iocb = NULL; |
| 5046 | msg.msg_flags = 0; |
| 5047 | |
Pavel Begunkov | 0441180 | 2021-04-01 15:44:00 +0100 | [diff] [blame] | 5048 | flags = req->sr_msg.msg_flags; |
| 5049 | if (force_nonblock) |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 5050 | flags |= MSG_DONTWAIT; |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 5051 | if (flags & MSG_WAITALL) |
| 5052 | min_ret = iov_iter_count(&msg.msg_iter); |
| 5053 | |
Pavel Begunkov | 7a7cacb | 2020-07-16 23:27:59 +0300 | [diff] [blame] | 5054 | ret = sock_recvmsg(sock, &msg, flags); |
| 5055 | if (force_nonblock && ret == -EAGAIN) |
| 5056 | return -EAGAIN; |
| 5057 | if (ret == -ERESTARTSYS) |
| 5058 | ret = -EINTR; |
Pavel Begunkov | 14c32ee | 2020-07-16 23:28:01 +0300 | [diff] [blame] | 5059 | out_free: |
Pavel Begunkov | 7fbb1b5 | 2020-07-16 23:28:05 +0300 | [diff] [blame] | 5060 | if (req->flags & REQ_F_BUFFER_SELECTED) |
| 5061 | cflags = io_put_recv_kbuf(req); |
Stefan Metzmacher | 0031275 | 2021-03-20 20:33:36 +0100 | [diff] [blame] | 5062 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 5063 | req_set_fail(req); |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 5064 | __io_req_complete(req, issue_flags, ret, cflags); |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 5065 | return 0; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 5066 | } |
| 5067 | |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 5068 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Jens Axboe | 17f2fe3 | 2019-10-17 14:42:58 -0600 | [diff] [blame] | 5069 | { |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 5070 | struct io_accept *accept = &req->accept; |
| 5071 | |
Jens Axboe | 14587a46 | 2020-09-05 11:36:08 -0600 | [diff] [blame] | 5072 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
Jens Axboe | 17f2fe3 | 2019-10-17 14:42:58 -0600 | [diff] [blame] | 5073 | return -EINVAL; |
Pavel Begunkov | aaa4db1 | 2021-08-25 12:25:47 +0100 | [diff] [blame] | 5074 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
Jens Axboe | 17f2fe3 | 2019-10-17 14:42:58 -0600 | [diff] [blame] | 5075 | return -EINVAL; |
| 5076 | |
Jens Axboe | d55e5f5 | 2019-12-11 16:12:15 -0700 | [diff] [blame] | 5077 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 5078 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 5079 | accept->flags = READ_ONCE(sqe->accept_flags); |
Jens Axboe | 09952e3 | 2020-03-19 20:16:56 -0600 | [diff] [blame] | 5080 | accept->nofile = rlimit(RLIMIT_NOFILE); |
Pavel Begunkov | a7083ad | 2021-08-25 12:25:46 +0100 | [diff] [blame] | 5081 | |
Pavel Begunkov | aaa4db1 | 2021-08-25 12:25:47 +0100 | [diff] [blame] | 5082 | accept->file_slot = READ_ONCE(sqe->file_index); |
| 5083 | if (accept->file_slot && ((req->open.how.flags & O_CLOEXEC) || |
| 5084 | (accept->flags & SOCK_CLOEXEC))) |
| 5085 | return -EINVAL; |
Pavel Begunkov | a7083ad | 2021-08-25 12:25:46 +0100 | [diff] [blame] | 5086 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
| 5087 | return -EINVAL; |
| 5088 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) |
| 5089 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 5090 | return 0; |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 5091 | } |
Jens Axboe | 17f2fe3 | 2019-10-17 14:42:58 -0600 | [diff] [blame] | 5092 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 5093 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 5094 | { |
| 5095 | struct io_accept *accept = &req->accept; |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 5096 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 5097 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
Pavel Begunkov | aaa4db1 | 2021-08-25 12:25:47 +0100 | [diff] [blame] | 5098 | bool fixed = !!accept->file_slot; |
Pavel Begunkov | a7083ad | 2021-08-25 12:25:46 +0100 | [diff] [blame] | 5099 | struct file *file; |
| 5100 | int ret, fd; |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 5101 | |
Jiufei Xue | e697dee | 2020-06-10 13:41:59 +0800 | [diff] [blame] | 5102 | if (req->file->f_flags & O_NONBLOCK) |
| 5103 | req->flags |= REQ_F_NOWAIT; |
| 5104 | |
Pavel Begunkov | aaa4db1 | 2021-08-25 12:25:47 +0100 | [diff] [blame] | 5105 | if (!fixed) { |
| 5106 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); |
| 5107 | if (unlikely(fd < 0)) |
| 5108 | return fd; |
| 5109 | } |
Pavel Begunkov | a7083ad | 2021-08-25 12:25:46 +0100 | [diff] [blame] | 5110 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
| 5111 | accept->flags); |
| 5112 | if (IS_ERR(file)) { |
Pavel Begunkov | aaa4db1 | 2021-08-25 12:25:47 +0100 | [diff] [blame] | 5113 | if (!fixed) |
| 5114 | put_unused_fd(fd); |
Pavel Begunkov | a7083ad | 2021-08-25 12:25:46 +0100 | [diff] [blame] | 5115 | ret = PTR_ERR(file); |
| 5116 | if (ret == -EAGAIN && force_nonblock) |
| 5117 | return -EAGAIN; |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 5118 | if (ret == -ERESTARTSYS) |
| 5119 | ret = -EINTR; |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 5120 | req_set_fail(req); |
Pavel Begunkov | aaa4db1 | 2021-08-25 12:25:47 +0100 | [diff] [blame] | 5121 | } else if (!fixed) { |
Pavel Begunkov | a7083ad | 2021-08-25 12:25:46 +0100 | [diff] [blame] | 5122 | fd_install(fd, file); |
| 5123 | ret = fd; |
Pavel Begunkov | aaa4db1 | 2021-08-25 12:25:47 +0100 | [diff] [blame] | 5124 | } else { |
| 5125 | ret = io_install_fixed_file(req, file, issue_flags, |
| 5126 | accept->file_slot - 1); |
Pavel Begunkov | ac45abc | 2020-06-08 21:08:18 +0300 | [diff] [blame] | 5127 | } |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 5128 | __io_req_complete(req, issue_flags, ret, 0); |
Jens Axboe | 17f2fe3 | 2019-10-17 14:42:58 -0600 | [diff] [blame] | 5129 | return 0; |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 5130 | } |
| 5131 | |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 5132 | static int io_connect_prep_async(struct io_kiocb *req) |
| 5133 | { |
| 5134 | struct io_async_connect *io = req->async_data; |
| 5135 | struct io_connect *conn = &req->connect; |
| 5136 | |
| 5137 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); |
| 5138 | } |
| 5139 | |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 5140 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Jens Axboe | f499a02 | 2019-12-02 16:28:46 -0700 | [diff] [blame] | 5141 | { |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 5142 | struct io_connect *conn = &req->connect; |
Jens Axboe | f499a02 | 2019-12-02 16:28:46 -0700 | [diff] [blame] | 5143 | |
Jens Axboe | 14587a46 | 2020-09-05 11:36:08 -0600 | [diff] [blame] | 5144 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
Jens Axboe | 3fbb51c | 2019-12-20 08:51:52 -0700 | [diff] [blame] | 5145 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 5146 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || |
| 5147 | sqe->splice_fd_in) |
Jens Axboe | 3fbb51c | 2019-12-20 08:51:52 -0700 | [diff] [blame] | 5148 | return -EINVAL; |
| 5149 | |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 5150 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 5151 | conn->addr_len = READ_ONCE(sqe->addr2); |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 5152 | return 0; |
Jens Axboe | f499a02 | 2019-12-02 16:28:46 -0700 | [diff] [blame] | 5153 | } |
| 5154 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 5155 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | f8e85cf | 2019-11-23 14:24:24 -0700 | [diff] [blame] | 5156 | { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 5157 | struct io_async_connect __io, *io; |
Jens Axboe | f8e85cf | 2019-11-23 14:24:24 -0700 | [diff] [blame] | 5158 | unsigned file_flags; |
Jens Axboe | 3fbb51c | 2019-12-20 08:51:52 -0700 | [diff] [blame] | 5159 | int ret; |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 5160 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
Jens Axboe | f8e85cf | 2019-11-23 14:24:24 -0700 | [diff] [blame] | 5161 | |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 5162 | if (req->async_data) { |
| 5163 | io = req->async_data; |
Jens Axboe | f499a02 | 2019-12-02 16:28:46 -0700 | [diff] [blame] | 5164 | } else { |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 5165 | ret = move_addr_to_kernel(req->connect.addr, |
| 5166 | req->connect.addr_len, |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 5167 | &__io.address); |
Jens Axboe | f499a02 | 2019-12-02 16:28:46 -0700 | [diff] [blame] | 5168 | if (ret) |
| 5169 | goto out; |
| 5170 | io = &__io; |
| 5171 | } |
| 5172 | |
Jens Axboe | 3fbb51c | 2019-12-20 08:51:52 -0700 | [diff] [blame] | 5173 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
| 5174 | |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 5175 | ret = __sys_connect_file(req->file, &io->address, |
Jens Axboe | 3fbb51c | 2019-12-20 08:51:52 -0700 | [diff] [blame] | 5176 | req->connect.addr_len, file_flags); |
Jens Axboe | 87f80d6 | 2019-12-03 11:23:54 -0700 | [diff] [blame] | 5177 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 5178 | if (req->async_data) |
Jens Axboe | b7bb4f7 | 2019-12-15 22:13:43 -0700 | [diff] [blame] | 5179 | return -EAGAIN; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 5180 | if (io_alloc_async_data(req)) { |
Jens Axboe | f499a02 | 2019-12-02 16:28:46 -0700 | [diff] [blame] | 5181 | ret = -ENOMEM; |
| 5182 | goto out; |
| 5183 | } |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 5184 | memcpy(req->async_data, &__io, sizeof(__io)); |
Jens Axboe | f8e85cf | 2019-11-23 14:24:24 -0700 | [diff] [blame] | 5185 | return -EAGAIN; |
Jens Axboe | f499a02 | 2019-12-02 16:28:46 -0700 | [diff] [blame] | 5186 | } |
Jens Axboe | f8e85cf | 2019-11-23 14:24:24 -0700 | [diff] [blame] | 5187 | if (ret == -ERESTARTSYS) |
| 5188 | ret = -EINTR; |
Jens Axboe | f499a02 | 2019-12-02 16:28:46 -0700 | [diff] [blame] | 5189 | out: |
Jens Axboe | 4e88d6e | 2019-12-07 20:59:47 -0700 | [diff] [blame] | 5190 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 5191 | req_set_fail(req); |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 5192 | __io_req_complete(req, issue_flags, ret, 0); |
Jens Axboe | f8e85cf | 2019-11-23 14:24:24 -0700 | [diff] [blame] | 5193 | return 0; |
Jens Axboe | f8e85cf | 2019-11-23 14:24:24 -0700 | [diff] [blame] | 5194 | } |
YueHaibing | 469956e | 2020-03-04 15:53:52 +0800 | [diff] [blame] | 5195 | #else /* !CONFIG_NET */ |
Jens Axboe | 99a1008 | 2021-02-19 09:35:19 -0700 | [diff] [blame] | 5196 | #define IO_NETOP_FN(op) \ |
| 5197 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ |
| 5198 | { \ |
| 5199 | return -EOPNOTSUPP; \ |
Jens Axboe | f8e85cf | 2019-11-23 14:24:24 -0700 | [diff] [blame] | 5200 | } |
| 5201 | |
Jens Axboe | 99a1008 | 2021-02-19 09:35:19 -0700 | [diff] [blame] | 5202 | #define IO_NETOP_PREP(op) \ |
| 5203 | IO_NETOP_FN(op) \ |
| 5204 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ |
| 5205 | { \ |
| 5206 | return -EOPNOTSUPP; \ |
| 5207 | } \ |
| 5208 | |
| 5209 | #define IO_NETOP_PREP_ASYNC(op) \ |
| 5210 | IO_NETOP_PREP(op) \ |
| 5211 | static int io_##op##_prep_async(struct io_kiocb *req) \ |
| 5212 | { \ |
| 5213 | return -EOPNOTSUPP; \ |
YueHaibing | 469956e | 2020-03-04 15:53:52 +0800 | [diff] [blame] | 5214 | } |
| 5215 | |
Jens Axboe | 99a1008 | 2021-02-19 09:35:19 -0700 | [diff] [blame] | 5216 | IO_NETOP_PREP_ASYNC(sendmsg); |
| 5217 | IO_NETOP_PREP_ASYNC(recvmsg); |
| 5218 | IO_NETOP_PREP_ASYNC(connect); |
| 5219 | IO_NETOP_PREP(accept); |
| 5220 | IO_NETOP_FN(send); |
| 5221 | IO_NETOP_FN(recv); |
YueHaibing | 469956e | 2020-03-04 15:53:52 +0800 | [diff] [blame] | 5222 | #endif /* CONFIG_NET */ |
Jens Axboe | 17f2fe3 | 2019-10-17 14:42:58 -0600 | [diff] [blame] | 5223 | |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5224 | struct io_poll_table { |
| 5225 | struct poll_table_struct pt; |
| 5226 | struct io_kiocb *req; |
Pavel Begunkov | 68b11e8 | 2021-07-20 10:50:43 +0100 | [diff] [blame] | 5227 | int nr_entries; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5228 | int error; |
| 5229 | }; |
| 5230 | |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5231 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
Pavel Begunkov | 5b0a6ac | 2021-06-30 21:54:04 +0100 | [diff] [blame] | 5232 | __poll_t mask, io_req_tw_func_t func) |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5233 | { |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5234 | /* for instances that support it check for an event match first: */ |
| 5235 | if (mask && !(mask & poll->events)) |
| 5236 | return 0; |
| 5237 | |
| 5238 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); |
| 5239 | |
| 5240 | list_del_init(&poll->wait.entry); |
| 5241 | |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5242 | req->result = mask; |
Pavel Begunkov | 5b0a6ac | 2021-06-30 21:54:04 +0100 | [diff] [blame] | 5243 | req->io_task_work.func = func; |
Jens Axboe | 6d816e0 | 2020-08-11 08:04:14 -0600 | [diff] [blame] | 5244 | |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5245 | /* |
Jens Axboe | e3aabf9 | 2020-05-18 11:04:17 -0600 | [diff] [blame] | 5246 | * If this fails, then the task is exiting. When a task exits, the |
| 5247 | * work gets canceled, so just cancel this request as well instead |
| 5248 | * of executing it. We can't safely execute it anyway, as we may not |
| 5249 | * have the needed state needed for it anyway. |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5250 | */ |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 5251 | io_req_task_work_add(req); |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5252 | return 1; |
| 5253 | } |
| 5254 | |
Jens Axboe | 74ce6ce | 2020-04-13 11:09:12 -0600 | [diff] [blame] | 5255 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
| 5256 | __acquires(&req->ctx->completion_lock) |
| 5257 | { |
| 5258 | struct io_ring_ctx *ctx = req->ctx; |
| 5259 | |
Jens Axboe | 316319e | 2021-08-19 09:41:42 -0600 | [diff] [blame] | 5260 | /* req->task == current here, checking PF_EXITING is safe */ |
Pavel Begunkov | e09ee51 | 2021-07-01 13:26:05 +0100 | [diff] [blame] | 5261 | if (unlikely(req->task->flags & PF_EXITING)) |
| 5262 | WRITE_ONCE(poll->canceled, true); |
| 5263 | |
Jens Axboe | 74ce6ce | 2020-04-13 11:09:12 -0600 | [diff] [blame] | 5264 | if (!req->result && !READ_ONCE(poll->canceled)) { |
| 5265 | struct poll_table_struct pt = { ._key = poll->events }; |
| 5266 | |
| 5267 | req->result = vfs_poll(req->file, &pt) & poll->events; |
| 5268 | } |
| 5269 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5270 | spin_lock(&ctx->completion_lock); |
Jens Axboe | 74ce6ce | 2020-04-13 11:09:12 -0600 | [diff] [blame] | 5271 | if (!req->result && !READ_ONCE(poll->canceled)) { |
| 5272 | add_wait_queue(poll->head, &poll->wait); |
| 5273 | return true; |
| 5274 | } |
| 5275 | |
| 5276 | return false; |
| 5277 | } |
| 5278 | |
Jens Axboe | d4e7cd3 | 2020-08-15 11:44:50 -0700 | [diff] [blame] | 5279 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5280 | { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 5281 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
Jens Axboe | d4e7cd3 | 2020-08-15 11:44:50 -0700 | [diff] [blame] | 5282 | if (req->opcode == IORING_OP_POLL_ADD) |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 5283 | return req->async_data; |
Jens Axboe | d4e7cd3 | 2020-08-15 11:44:50 -0700 | [diff] [blame] | 5284 | return req->apoll->double_poll; |
| 5285 | } |
| 5286 | |
| 5287 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) |
| 5288 | { |
| 5289 | if (req->opcode == IORING_OP_POLL_ADD) |
| 5290 | return &req->poll; |
| 5291 | return &req->apoll->poll; |
| 5292 | } |
| 5293 | |
| 5294 | static void io_poll_remove_double(struct io_kiocb *req) |
Pavel Begunkov | e07785b | 2021-04-01 15:43:57 +0100 | [diff] [blame] | 5295 | __must_hold(&req->ctx->completion_lock) |
Jens Axboe | d4e7cd3 | 2020-08-15 11:44:50 -0700 | [diff] [blame] | 5296 | { |
| 5297 | struct io_poll_iocb *poll = io_poll_get_double(req); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5298 | |
| 5299 | lockdep_assert_held(&req->ctx->completion_lock); |
| 5300 | |
| 5301 | if (poll && poll->head) { |
| 5302 | struct wait_queue_head *head = poll->head; |
| 5303 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5304 | spin_lock_irq(&head->lock); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5305 | list_del_init(&poll->wait.entry); |
| 5306 | if (poll->wait.private) |
Jens Axboe | de9b4cc | 2021-02-24 13:28:27 -0700 | [diff] [blame] | 5307 | req_ref_put(req); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5308 | poll->head = NULL; |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5309 | spin_unlock_irq(&head->lock); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5310 | } |
| 5311 | } |
| 5312 | |
Xiaoguang Wang | 31efe48 | 2021-09-03 22:24:36 +0800 | [diff] [blame] | 5313 | static bool __io_poll_complete(struct io_kiocb *req, __poll_t mask) |
Pavel Begunkov | e07785b | 2021-04-01 15:43:57 +0100 | [diff] [blame] | 5314 | __must_hold(&req->ctx->completion_lock) |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5315 | { |
| 5316 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5317 | unsigned flags = IORING_CQE_F_MORE; |
Pavel Begunkov | e27414b | 2021-04-09 09:13:20 +0100 | [diff] [blame] | 5318 | int error; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5319 | |
Pavel Begunkov | e27414b | 2021-04-09 09:13:20 +0100 | [diff] [blame] | 5320 | if (READ_ONCE(req->poll.canceled)) { |
Jens Axboe | 45ab03b | 2021-02-23 08:19:33 -0700 | [diff] [blame] | 5321 | error = -ECANCELED; |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5322 | req->poll.events |= EPOLLONESHOT; |
Pavel Begunkov | e27414b | 2021-04-09 09:13:20 +0100 | [diff] [blame] | 5323 | } else { |
Jens Axboe | 5082620 | 2021-02-23 09:02:26 -0700 | [diff] [blame] | 5324 | error = mangle_poll(mask); |
Pavel Begunkov | e27414b | 2021-04-09 09:13:20 +0100 | [diff] [blame] | 5325 | } |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5326 | if (req->poll.events & EPOLLONESHOT) |
| 5327 | flags = 0; |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 5328 | if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) { |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5329 | req->poll.done = true; |
| 5330 | flags = 0; |
| 5331 | } |
Hao Xu | 7b289c3 | 2021-04-13 15:20:39 +0800 | [diff] [blame] | 5332 | if (flags & IORING_CQE_F_MORE) |
| 5333 | ctx->cq_extra++; |
| 5334 | |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5335 | return !(flags & IORING_CQE_F_MORE); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5336 | } |
| 5337 | |
Xiaoguang Wang | 31efe48 | 2021-09-03 22:24:36 +0800 | [diff] [blame] | 5338 | static inline bool io_poll_complete(struct io_kiocb *req, __poll_t mask) |
| 5339 | __must_hold(&req->ctx->completion_lock) |
| 5340 | { |
| 5341 | bool done; |
| 5342 | |
| 5343 | done = __io_poll_complete(req, mask); |
| 5344 | io_commit_cqring(req->ctx); |
| 5345 | return done; |
| 5346 | } |
| 5347 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 5348 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5349 | { |
Jens Axboe | 6d816e0 | 2020-08-11 08:04:14 -0600 | [diff] [blame] | 5350 | struct io_ring_ctx *ctx = req->ctx; |
Pavel Begunkov | dd221f46 | 2020-10-18 10:17:42 +0100 | [diff] [blame] | 5351 | struct io_kiocb *nxt; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5352 | |
Pavel Begunkov | dd221f46 | 2020-10-18 10:17:42 +0100 | [diff] [blame] | 5353 | if (io_poll_rewait(req, &req->poll)) { |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5354 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | dd221f46 | 2020-10-18 10:17:42 +0100 | [diff] [blame] | 5355 | } else { |
Pavel Begunkov | f40b964 | 2021-04-09 09:13:19 +0100 | [diff] [blame] | 5356 | bool done; |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5357 | |
Xiaoguang Wang | 31efe48 | 2021-09-03 22:24:36 +0800 | [diff] [blame] | 5358 | done = __io_poll_complete(req, req->result); |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5359 | if (done) { |
Hao Xu | a890d01 | 2021-07-28 11:03:22 +0800 | [diff] [blame] | 5360 | io_poll_remove_double(req); |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5361 | hash_del(&req->hash_node); |
Pavel Begunkov | f40b964 | 2021-04-09 09:13:19 +0100 | [diff] [blame] | 5362 | } else { |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5363 | req->result = 0; |
| 5364 | add_wait_queue(req->poll.head, &req->poll.wait); |
| 5365 | } |
Xiaoguang Wang | 31efe48 | 2021-09-03 22:24:36 +0800 | [diff] [blame] | 5366 | io_commit_cqring(ctx); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5367 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | dd221f46 | 2020-10-18 10:17:42 +0100 | [diff] [blame] | 5368 | io_cqring_ev_posted(ctx); |
Pavel Begunkov | dd221f46 | 2020-10-18 10:17:42 +0100 | [diff] [blame] | 5369 | |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5370 | if (done) { |
| 5371 | nxt = io_put_req_find_next(req); |
| 5372 | if (nxt) |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 5373 | io_req_task_submit(nxt, locked); |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5374 | } |
Pavel Begunkov | ea1164e | 2020-06-30 15:20:41 +0300 | [diff] [blame] | 5375 | } |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5376 | } |
| 5377 | |
| 5378 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, |
| 5379 | int sync, void *key) |
| 5380 | { |
| 5381 | struct io_kiocb *req = wait->private; |
Jens Axboe | d4e7cd3 | 2020-08-15 11:44:50 -0700 | [diff] [blame] | 5382 | struct io_poll_iocb *poll = io_poll_get_single(req); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5383 | __poll_t mask = key_to_poll(key); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5384 | unsigned long flags; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5385 | |
| 5386 | /* for instances that support it check for an event match first: */ |
| 5387 | if (mask && !(mask & poll->events)) |
| 5388 | return 0; |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5389 | if (!(poll->events & EPOLLONESHOT)) |
| 5390 | return poll->wait.func(&poll->wait, mode, sync, key); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5391 | |
Jens Axboe | 8706e04 | 2020-09-28 08:38:54 -0600 | [diff] [blame] | 5392 | list_del_init(&wait->entry); |
| 5393 | |
Jens Axboe | 9ce85ef | 2021-07-09 08:20:28 -0600 | [diff] [blame] | 5394 | if (poll->head) { |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5395 | bool done; |
| 5396 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5397 | spin_lock_irqsave(&poll->head->lock, flags); |
Jens Axboe | 807abcb | 2020-07-17 17:09:27 -0600 | [diff] [blame] | 5398 | done = list_empty(&poll->wait.entry); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5399 | if (!done) |
Jens Axboe | 807abcb | 2020-07-17 17:09:27 -0600 | [diff] [blame] | 5400 | list_del_init(&poll->wait.entry); |
Jens Axboe | d4e7cd3 | 2020-08-15 11:44:50 -0700 | [diff] [blame] | 5401 | /* make sure double remove sees this as being gone */ |
| 5402 | wait->private = NULL; |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5403 | spin_unlock_irqrestore(&poll->head->lock, flags); |
Jens Axboe | c8b5e26 | 2020-10-25 13:53:26 -0600 | [diff] [blame] | 5404 | if (!done) { |
| 5405 | /* use wait func handler, so it matches the rq type */ |
| 5406 | poll->wait.func(&poll->wait, mode, sync, key); |
| 5407 | } |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5408 | } |
Jens Axboe | de9b4cc | 2021-02-24 13:28:27 -0700 | [diff] [blame] | 5409 | req_ref_put(req); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5410 | return 1; |
| 5411 | } |
| 5412 | |
| 5413 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, |
| 5414 | wait_queue_func_t wake_func) |
| 5415 | { |
| 5416 | poll->head = NULL; |
| 5417 | poll->done = false; |
| 5418 | poll->canceled = false; |
Jens Axboe | 464dca6 | 2021-03-19 14:06:24 -0600 | [diff] [blame] | 5419 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
| 5420 | /* mask in events that we always want/need */ |
| 5421 | poll->events = events | IO_POLL_UNMASK; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5422 | INIT_LIST_HEAD(&poll->wait.entry); |
| 5423 | init_waitqueue_func_entry(&poll->wait, wake_func); |
| 5424 | } |
| 5425 | |
| 5426 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, |
Jens Axboe | 807abcb | 2020-07-17 17:09:27 -0600 | [diff] [blame] | 5427 | struct wait_queue_head *head, |
| 5428 | struct io_poll_iocb **poll_ptr) |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5429 | { |
| 5430 | struct io_kiocb *req = pt->req; |
| 5431 | |
| 5432 | /* |
Pavel Begunkov | 68b11e8 | 2021-07-20 10:50:43 +0100 | [diff] [blame] | 5433 | * The file being polled uses multiple waitqueues for poll handling |
| 5434 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb |
| 5435 | * if this happens. |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5436 | */ |
Pavel Begunkov | 68b11e8 | 2021-07-20 10:50:43 +0100 | [diff] [blame] | 5437 | if (unlikely(pt->nr_entries)) { |
Pavel Begunkov | 58852d4 | 2020-10-16 20:55:56 +0100 | [diff] [blame] | 5438 | struct io_poll_iocb *poll_one = poll; |
| 5439 | |
Pavel Begunkov | 23a65db | 2021-08-17 20:28:11 +0100 | [diff] [blame] | 5440 | /* double add on the same waitqueue head, ignore */ |
| 5441 | if (poll_one->head == head) |
| 5442 | return; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5443 | /* already have a 2nd entry, fail a third attempt */ |
Jens Axboe | 807abcb | 2020-07-17 17:09:27 -0600 | [diff] [blame] | 5444 | if (*poll_ptr) { |
Pavel Begunkov | 23a65db | 2021-08-17 20:28:11 +0100 | [diff] [blame] | 5445 | if ((*poll_ptr)->head == head) |
| 5446 | return; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5447 | pt->error = -EINVAL; |
| 5448 | return; |
| 5449 | } |
Jens Axboe | ea6a693d | 2021-04-15 09:47:13 -0600 | [diff] [blame] | 5450 | /* |
| 5451 | * Can't handle multishot for double wait for now, turn it |
| 5452 | * into one-shot mode. |
| 5453 | */ |
Pavel Begunkov | 7a27472 | 2021-05-17 12:43:34 +0100 | [diff] [blame] | 5454 | if (!(poll_one->events & EPOLLONESHOT)) |
| 5455 | poll_one->events |= EPOLLONESHOT; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5456 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
| 5457 | if (!poll) { |
| 5458 | pt->error = -ENOMEM; |
| 5459 | return; |
| 5460 | } |
Pavel Begunkov | 58852d4 | 2020-10-16 20:55:56 +0100 | [diff] [blame] | 5461 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
Jens Axboe | de9b4cc | 2021-02-24 13:28:27 -0700 | [diff] [blame] | 5462 | req_ref_get(req); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5463 | poll->wait.private = req; |
Jens Axboe | 807abcb | 2020-07-17 17:09:27 -0600 | [diff] [blame] | 5464 | *poll_ptr = poll; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5465 | } |
| 5466 | |
Pavel Begunkov | 68b11e8 | 2021-07-20 10:50:43 +0100 | [diff] [blame] | 5467 | pt->nr_entries++; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5468 | poll->head = head; |
Jiufei Xue | a31eb4a | 2020-06-17 17:53:56 +0800 | [diff] [blame] | 5469 | |
| 5470 | if (poll->events & EPOLLEXCLUSIVE) |
| 5471 | add_wait_queue_exclusive(head, &poll->wait); |
| 5472 | else |
| 5473 | add_wait_queue(head, &poll->wait); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5474 | } |
| 5475 | |
| 5476 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, |
| 5477 | struct poll_table_struct *p) |
| 5478 | { |
| 5479 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); |
Jens Axboe | 807abcb | 2020-07-17 17:09:27 -0600 | [diff] [blame] | 5480 | struct async_poll *apoll = pt->req->apoll; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5481 | |
Jens Axboe | 807abcb | 2020-07-17 17:09:27 -0600 | [diff] [blame] | 5482 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5483 | } |
| 5484 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 5485 | static void io_async_task_func(struct io_kiocb *req, bool *locked) |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5486 | { |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5487 | struct async_poll *apoll = req->apoll; |
| 5488 | struct io_ring_ctx *ctx = req->ctx; |
| 5489 | |
Olivier Langlois | 236daeae | 2021-05-31 02:36:37 -0400 | [diff] [blame] | 5490 | trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data); |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5491 | |
Jens Axboe | 74ce6ce | 2020-04-13 11:09:12 -0600 | [diff] [blame] | 5492 | if (io_poll_rewait(req, &apoll->poll)) { |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5493 | spin_unlock(&ctx->completion_lock); |
Jens Axboe | 74ce6ce | 2020-04-13 11:09:12 -0600 | [diff] [blame] | 5494 | return; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5495 | } |
| 5496 | |
Pavel Begunkov | 0ea13b4 | 2021-04-09 09:13:21 +0100 | [diff] [blame] | 5497 | hash_del(&req->hash_node); |
Jens Axboe | d4e7cd3 | 2020-08-15 11:44:50 -0700 | [diff] [blame] | 5498 | io_poll_remove_double(req); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5499 | spin_unlock(&ctx->completion_lock); |
Jens Axboe | 74ce6ce | 2020-04-13 11:09:12 -0600 | [diff] [blame] | 5500 | |
Pavel Begunkov | 0be0b0e | 2020-06-30 15:20:42 +0300 | [diff] [blame] | 5501 | if (!READ_ONCE(apoll->poll.canceled)) |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 5502 | io_req_task_submit(req, locked); |
Pavel Begunkov | 0be0b0e | 2020-06-30 15:20:42 +0300 | [diff] [blame] | 5503 | else |
Pavel Begunkov | 2593553 | 2021-03-19 17:22:40 +0000 | [diff] [blame] | 5504 | io_req_complete_failed(req, -ECANCELED); |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5505 | } |
| 5506 | |
| 5507 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
| 5508 | void *key) |
| 5509 | { |
| 5510 | struct io_kiocb *req = wait->private; |
| 5511 | struct io_poll_iocb *poll = &req->apoll->poll; |
| 5512 | |
| 5513 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, |
| 5514 | key_to_poll(key)); |
| 5515 | |
| 5516 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); |
| 5517 | } |
| 5518 | |
| 5519 | static void io_poll_req_insert(struct io_kiocb *req) |
| 5520 | { |
| 5521 | struct io_ring_ctx *ctx = req->ctx; |
| 5522 | struct hlist_head *list; |
| 5523 | |
| 5524 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; |
| 5525 | hlist_add_head(&req->hash_node, list); |
| 5526 | } |
| 5527 | |
| 5528 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, |
| 5529 | struct io_poll_iocb *poll, |
| 5530 | struct io_poll_table *ipt, __poll_t mask, |
| 5531 | wait_queue_func_t wake_func) |
| 5532 | __acquires(&ctx->completion_lock) |
| 5533 | { |
| 5534 | struct io_ring_ctx *ctx = req->ctx; |
| 5535 | bool cancel = false; |
| 5536 | |
Pavel Begunkov | 4d52f33 | 2020-10-18 10:17:43 +0100 | [diff] [blame] | 5537 | INIT_HLIST_NODE(&req->hash_node); |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5538 | io_init_poll_iocb(poll, mask, wake_func); |
Pavel Begunkov | b90cd19 | 2020-06-21 13:09:52 +0300 | [diff] [blame] | 5539 | poll->file = req->file; |
Jens Axboe | 18bceab | 2020-05-15 11:56:54 -0600 | [diff] [blame] | 5540 | poll->wait.private = req; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5541 | |
| 5542 | ipt->pt._key = mask; |
| 5543 | ipt->req = req; |
Pavel Begunkov | 68b11e8 | 2021-07-20 10:50:43 +0100 | [diff] [blame] | 5544 | ipt->error = 0; |
| 5545 | ipt->nr_entries = 0; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5546 | |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5547 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
Pavel Begunkov | 68b11e8 | 2021-07-20 10:50:43 +0100 | [diff] [blame] | 5548 | if (unlikely(!ipt->nr_entries) && !ipt->error) |
| 5549 | ipt->error = -EINVAL; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5550 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5551 | spin_lock(&ctx->completion_lock); |
Hao Xu | a890d01 | 2021-07-28 11:03:22 +0800 | [diff] [blame] | 5552 | if (ipt->error || (mask && (poll->events & EPOLLONESHOT))) |
Pavel Begunkov | 46fee9a | 2021-07-20 10:50:44 +0100 | [diff] [blame] | 5553 | io_poll_remove_double(req); |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5554 | if (likely(poll->head)) { |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5555 | spin_lock_irq(&poll->head->lock); |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5556 | if (unlikely(list_empty(&poll->wait.entry))) { |
| 5557 | if (ipt->error) |
| 5558 | cancel = true; |
| 5559 | ipt->error = 0; |
| 5560 | mask = 0; |
| 5561 | } |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5562 | if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error) |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5563 | list_del_init(&poll->wait.entry); |
| 5564 | else if (cancel) |
| 5565 | WRITE_ONCE(poll->canceled, true); |
| 5566 | else if (!poll->done) /* actually waiting for an event */ |
| 5567 | io_poll_req_insert(req); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5568 | spin_unlock_irq(&poll->head->lock); |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5569 | } |
| 5570 | |
| 5571 | return mask; |
| 5572 | } |
| 5573 | |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 5574 | enum { |
| 5575 | IO_APOLL_OK, |
| 5576 | IO_APOLL_ABORTED, |
| 5577 | IO_APOLL_READY |
| 5578 | }; |
| 5579 | |
| 5580 | static int io_arm_poll_handler(struct io_kiocb *req) |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5581 | { |
| 5582 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
| 5583 | struct io_ring_ctx *ctx = req->ctx; |
| 5584 | struct async_poll *apoll; |
| 5585 | struct io_poll_table ipt; |
Pavel Begunkov | b2d9c3d | 2021-06-26 21:40:44 +0100 | [diff] [blame] | 5586 | __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; |
Jens Axboe | 9dab14b | 2020-08-25 12:27:50 -0600 | [diff] [blame] | 5587 | int rw; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5588 | |
| 5589 | if (!req->file || !file_can_poll(req->file)) |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 5590 | return IO_APOLL_ABORTED; |
Pavel Begunkov | 24c7467 | 2020-06-21 13:09:51 +0300 | [diff] [blame] | 5591 | if (req->flags & REQ_F_POLLED) |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 5592 | return IO_APOLL_ABORTED; |
Pavel Begunkov | b2d9c3d | 2021-06-26 21:40:44 +0100 | [diff] [blame] | 5593 | if (!def->pollin && !def->pollout) |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 5594 | return IO_APOLL_ABORTED; |
Pavel Begunkov | b2d9c3d | 2021-06-26 21:40:44 +0100 | [diff] [blame] | 5595 | |
| 5596 | if (def->pollin) { |
| 5597 | rw = READ; |
| 5598 | mask |= POLLIN | POLLRDNORM; |
| 5599 | |
| 5600 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ |
| 5601 | if ((req->opcode == IORING_OP_RECVMSG) && |
| 5602 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) |
| 5603 | mask &= ~POLLIN; |
| 5604 | } else { |
| 5605 | rw = WRITE; |
| 5606 | mask |= POLLOUT | POLLWRNORM; |
| 5607 | } |
| 5608 | |
Jens Axboe | 9dab14b | 2020-08-25 12:27:50 -0600 | [diff] [blame] | 5609 | /* if we can't nonblock try, then no point in arming a poll handler */ |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 5610 | if (!io_file_supports_nowait(req, rw)) |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 5611 | return IO_APOLL_ABORTED; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5612 | |
| 5613 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); |
| 5614 | if (unlikely(!apoll)) |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 5615 | return IO_APOLL_ABORTED; |
Jens Axboe | 807abcb | 2020-07-17 17:09:27 -0600 | [diff] [blame] | 5616 | apoll->double_poll = NULL; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5617 | req->apoll = apoll; |
Pavel Begunkov | b2d9c3d | 2021-06-26 21:40:44 +0100 | [diff] [blame] | 5618 | req->flags |= REQ_F_POLLED; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5619 | ipt.pt._qproc = io_async_queue_proc; |
Pavel Begunkov | 48dcd38 | 2021-08-15 10:40:18 +0100 | [diff] [blame] | 5620 | io_req_set_refcount(req); |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5621 | |
| 5622 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, |
| 5623 | io_async_wake); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5624 | spin_unlock(&ctx->completion_lock); |
Hao Xu | 41a5169 | 2021-08-12 15:47:02 +0800 | [diff] [blame] | 5625 | if (ret || ipt.error) |
| 5626 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; |
| 5627 | |
Olivier Langlois | 236daeae | 2021-05-31 02:36:37 -0400 | [diff] [blame] | 5628 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
| 5629 | mask, apoll->poll.events); |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 5630 | return IO_APOLL_OK; |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5631 | } |
| 5632 | |
| 5633 | static bool __io_poll_remove_one(struct io_kiocb *req, |
Jens Axboe | b2e720a | 2021-03-31 09:03:03 -0600 | [diff] [blame] | 5634 | struct io_poll_iocb *poll, bool do_cancel) |
Pavel Begunkov | e07785b | 2021-04-01 15:43:57 +0100 | [diff] [blame] | 5635 | __must_hold(&req->ctx->completion_lock) |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5636 | { |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 5637 | bool do_complete = false; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5638 | |
Jens Axboe | 5082620 | 2021-02-23 09:02:26 -0700 | [diff] [blame] | 5639 | if (!poll->head) |
| 5640 | return false; |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5641 | spin_lock_irq(&poll->head->lock); |
Jens Axboe | b2e720a | 2021-03-31 09:03:03 -0600 | [diff] [blame] | 5642 | if (do_cancel) |
| 5643 | WRITE_ONCE(poll->canceled, true); |
Jens Axboe | 392edb4 | 2019-12-09 17:52:20 -0700 | [diff] [blame] | 5644 | if (!list_empty(&poll->wait.entry)) { |
| 5645 | list_del_init(&poll->wait.entry); |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 5646 | do_complete = true; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5647 | } |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5648 | spin_unlock_irq(&poll->head->lock); |
Jens Axboe | 3bfa5bc | 2020-05-17 13:54:12 -0600 | [diff] [blame] | 5649 | hash_del(&req->hash_node); |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5650 | return do_complete; |
| 5651 | } |
| 5652 | |
Pavel Begunkov | 5d70904 | 2021-08-09 20:18:13 +0100 | [diff] [blame] | 5653 | static bool io_poll_remove_one(struct io_kiocb *req) |
Pavel Begunkov | e07785b | 2021-04-01 15:43:57 +0100 | [diff] [blame] | 5654 | __must_hold(&req->ctx->completion_lock) |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5655 | { |
| 5656 | bool do_complete; |
| 5657 | |
Jens Axboe | d4e7cd3 | 2020-08-15 11:44:50 -0700 | [diff] [blame] | 5658 | io_poll_remove_double(req); |
Pavel Begunkov | e31001a | 2021-04-13 02:58:43 +0100 | [diff] [blame] | 5659 | do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true); |
Jens Axboe | d4e7cd3 | 2020-08-15 11:44:50 -0700 | [diff] [blame] | 5660 | |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 5661 | if (do_complete) { |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 5662 | io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0); |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 5663 | io_commit_cqring(req->ctx); |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 5664 | req_set_fail(req); |
Pavel Begunkov | 91c2f69 | 2021-08-11 19:28:28 +0100 | [diff] [blame] | 5665 | io_put_req_deferred(req); |
Pavel Begunkov | 5d70904 | 2021-08-09 20:18:13 +0100 | [diff] [blame] | 5666 | } |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 5667 | return do_complete; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5668 | } |
| 5669 | |
Jens Axboe | 76e1b64 | 2020-09-26 15:05:03 -0600 | [diff] [blame] | 5670 | /* |
| 5671 | * Returns true if we found and killed one or more poll requests |
| 5672 | */ |
Pavel Begunkov | 6b81928 | 2020-11-06 13:00:25 +0000 | [diff] [blame] | 5673 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 5674 | bool cancel_all) |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5675 | { |
Jens Axboe | 78076bb | 2019-12-04 19:56:40 -0700 | [diff] [blame] | 5676 | struct hlist_node *tmp; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5677 | struct io_kiocb *req; |
Jens Axboe | 8e2e1fa | 2020-04-13 17:05:14 -0600 | [diff] [blame] | 5678 | int posted = 0, i; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5679 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5680 | spin_lock(&ctx->completion_lock); |
Jens Axboe | 78076bb | 2019-12-04 19:56:40 -0700 | [diff] [blame] | 5681 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
| 5682 | struct hlist_head *list; |
| 5683 | |
| 5684 | list = &ctx->cancel_hash[i]; |
Jens Axboe | f3606e3 | 2020-09-22 08:18:24 -0600 | [diff] [blame] | 5685 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 5686 | if (io_match_task(req, tsk, cancel_all)) |
Jens Axboe | f3606e3 | 2020-09-22 08:18:24 -0600 | [diff] [blame] | 5687 | posted += io_poll_remove_one(req); |
| 5688 | } |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5689 | } |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5690 | spin_unlock(&ctx->completion_lock); |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 5691 | |
Jens Axboe | 8e2e1fa | 2020-04-13 17:05:14 -0600 | [diff] [blame] | 5692 | if (posted) |
| 5693 | io_cqring_ev_posted(ctx); |
Jens Axboe | 76e1b64 | 2020-09-26 15:05:03 -0600 | [diff] [blame] | 5694 | |
| 5695 | return posted != 0; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5696 | } |
| 5697 | |
Pavel Begunkov | 9ba5fac | 2021-04-14 13:38:35 +0100 | [diff] [blame] | 5698 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
| 5699 | bool poll_only) |
Pavel Begunkov | e07785b | 2021-04-01 15:43:57 +0100 | [diff] [blame] | 5700 | __must_hold(&ctx->completion_lock) |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 5701 | { |
Jens Axboe | 78076bb | 2019-12-04 19:56:40 -0700 | [diff] [blame] | 5702 | struct hlist_head *list; |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 5703 | struct io_kiocb *req; |
| 5704 | |
Jens Axboe | 78076bb | 2019-12-04 19:56:40 -0700 | [diff] [blame] | 5705 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
| 5706 | hlist_for_each_entry(req, list, hash_node) { |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 5707 | if (sqe_addr != req->user_data) |
| 5708 | continue; |
Pavel Begunkov | 9ba5fac | 2021-04-14 13:38:35 +0100 | [diff] [blame] | 5709 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
| 5710 | continue; |
Jens Axboe | b2cb805 | 2021-03-17 08:17:19 -0600 | [diff] [blame] | 5711 | return req; |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 5712 | } |
Jens Axboe | b2cb805 | 2021-03-17 08:17:19 -0600 | [diff] [blame] | 5713 | return NULL; |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 5714 | } |
| 5715 | |
Pavel Begunkov | 9ba5fac | 2021-04-14 13:38:35 +0100 | [diff] [blame] | 5716 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
| 5717 | bool poll_only) |
Pavel Begunkov | e07785b | 2021-04-01 15:43:57 +0100 | [diff] [blame] | 5718 | __must_hold(&ctx->completion_lock) |
Jens Axboe | b2cb805 | 2021-03-17 08:17:19 -0600 | [diff] [blame] | 5719 | { |
| 5720 | struct io_kiocb *req; |
| 5721 | |
Pavel Begunkov | 9ba5fac | 2021-04-14 13:38:35 +0100 | [diff] [blame] | 5722 | req = io_poll_find(ctx, sqe_addr, poll_only); |
Jens Axboe | b2cb805 | 2021-03-17 08:17:19 -0600 | [diff] [blame] | 5723 | if (!req) |
| 5724 | return -ENOENT; |
| 5725 | if (io_poll_remove_one(req)) |
| 5726 | return 0; |
| 5727 | |
| 5728 | return -EALREADY; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5729 | } |
| 5730 | |
Pavel Begunkov | 9096af3 | 2021-04-14 13:38:36 +0100 | [diff] [blame] | 5731 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
| 5732 | unsigned int flags) |
| 5733 | { |
| 5734 | u32 events; |
| 5735 | |
| 5736 | events = READ_ONCE(sqe->poll32_events); |
| 5737 | #ifdef __BIG_ENDIAN |
| 5738 | events = swahw32(events); |
| 5739 | #endif |
| 5740 | if (!(flags & IORING_POLL_ADD_MULTI)) |
| 5741 | events |= EPOLLONESHOT; |
| 5742 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); |
| 5743 | } |
| 5744 | |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5745 | static int io_poll_update_prep(struct io_kiocb *req, |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 5746 | const struct io_uring_sqe *sqe) |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5747 | { |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5748 | struct io_poll_update *upd = &req->poll_update; |
| 5749 | u32 flags; |
| 5750 | |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5751 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 5752 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 5753 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5754 | return -EINVAL; |
| 5755 | flags = READ_ONCE(sqe->len); |
| 5756 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | |
| 5757 | IORING_POLL_ADD_MULTI)) |
| 5758 | return -EINVAL; |
| 5759 | /* meaningless without update */ |
| 5760 | if (flags == IORING_POLL_ADD_MULTI) |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5761 | return -EINVAL; |
| 5762 | |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5763 | upd->old_user_data = READ_ONCE(sqe->addr); |
| 5764 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; |
| 5765 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; |
Jens Axboe | 0969e78 | 2019-12-17 18:40:57 -0700 | [diff] [blame] | 5766 | |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5767 | upd->new_user_data = READ_ONCE(sqe->off); |
| 5768 | if (!upd->update_user_data && upd->new_user_data) |
| 5769 | return -EINVAL; |
| 5770 | if (upd->update_events) |
| 5771 | upd->events = io_poll_parse_events(sqe, flags); |
| 5772 | else if (sqe->poll32_events) |
| 5773 | return -EINVAL; |
Jens Axboe | 0969e78 | 2019-12-17 18:40:57 -0700 | [diff] [blame] | 5774 | |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5775 | return 0; |
| 5776 | } |
| 5777 | |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5778 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
| 5779 | void *key) |
| 5780 | { |
Jens Axboe | c2f2eb7 | 2020-02-10 09:07:05 -0700 | [diff] [blame] | 5781 | struct io_kiocb *req = wait->private; |
| 5782 | struct io_poll_iocb *poll = &req->poll; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5783 | |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5784 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5785 | } |
| 5786 | |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5787 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
| 5788 | struct poll_table_struct *p) |
| 5789 | { |
| 5790 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); |
| 5791 | |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 5792 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
Jens Axboe | eac406c6 | 2019-11-14 12:09:58 -0700 | [diff] [blame] | 5793 | } |
| 5794 | |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 5795 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5796 | { |
| 5797 | struct io_poll_iocb *poll = &req->poll; |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5798 | u32 flags; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5799 | |
| 5800 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 5801 | return -EINVAL; |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5802 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5803 | return -EINVAL; |
| 5804 | flags = READ_ONCE(sqe->len); |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5805 | if (flags & ~IORING_POLL_ADD_MULTI) |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5806 | return -EINVAL; |
| 5807 | |
Pavel Begunkov | 48dcd38 | 2021-08-15 10:40:18 +0100 | [diff] [blame] | 5808 | io_req_set_refcount(req); |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5809 | poll->events = io_poll_parse_events(sqe, flags); |
Jens Axboe | 0969e78 | 2019-12-17 18:40:57 -0700 | [diff] [blame] | 5810 | return 0; |
| 5811 | } |
| 5812 | |
Pavel Begunkov | 61e9820 | 2021-02-10 00:03:08 +0000 | [diff] [blame] | 5813 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 0969e78 | 2019-12-17 18:40:57 -0700 | [diff] [blame] | 5814 | { |
| 5815 | struct io_poll_iocb *poll = &req->poll; |
| 5816 | struct io_ring_ctx *ctx = req->ctx; |
| 5817 | struct io_poll_table ipt; |
Jens Axboe | 0969e78 | 2019-12-17 18:40:57 -0700 | [diff] [blame] | 5818 | __poll_t mask; |
Jens Axboe | 0969e78 | 2019-12-17 18:40:57 -0700 | [diff] [blame] | 5819 | |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5820 | ipt.pt._qproc = io_poll_queue_proc; |
Jens Axboe | 3670324 | 2019-07-25 10:20:18 -0600 | [diff] [blame] | 5821 | |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 5822 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
| 5823 | io_poll_wake); |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5824 | |
Jens Axboe | 8c83878 | 2019-03-12 15:48:16 -0600 | [diff] [blame] | 5825 | if (mask) { /* no async, we'd stolen it */ |
Jens Axboe | 8c83878 | 2019-03-12 15:48:16 -0600 | [diff] [blame] | 5826 | ipt.error = 0; |
Pavel Begunkov | e27414b | 2021-04-09 09:13:20 +0100 | [diff] [blame] | 5827 | io_poll_complete(req, mask); |
Jens Axboe | 8c83878 | 2019-03-12 15:48:16 -0600 | [diff] [blame] | 5828 | } |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5829 | spin_unlock(&ctx->completion_lock); |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5830 | |
Jens Axboe | 8c83878 | 2019-03-12 15:48:16 -0600 | [diff] [blame] | 5831 | if (mask) { |
| 5832 | io_cqring_ev_posted(ctx); |
Jens Axboe | 88e41cf | 2021-02-22 22:08:01 -0700 | [diff] [blame] | 5833 | if (poll->events & EPOLLONESHOT) |
| 5834 | io_put_req(req); |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5835 | } |
Jens Axboe | 8c83878 | 2019-03-12 15:48:16 -0600 | [diff] [blame] | 5836 | return ipt.error; |
Jens Axboe | 221c5eb | 2019-01-17 09:41:58 -0700 | [diff] [blame] | 5837 | } |
| 5838 | |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5839 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5840 | { |
| 5841 | struct io_ring_ctx *ctx = req->ctx; |
| 5842 | struct io_kiocb *preq; |
Jens Axboe | cb3b200e | 2021-04-06 09:49:31 -0600 | [diff] [blame] | 5843 | bool completing; |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5844 | int ret; |
| 5845 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5846 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | 9ba5fac | 2021-04-14 13:38:35 +0100 | [diff] [blame] | 5847 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5848 | if (!preq) { |
| 5849 | ret = -ENOENT; |
| 5850 | goto err; |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5851 | } |
Jens Axboe | cb3b200e | 2021-04-06 09:49:31 -0600 | [diff] [blame] | 5852 | |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5853 | if (!req->poll_update.update_events && !req->poll_update.update_user_data) { |
| 5854 | completing = true; |
| 5855 | ret = io_poll_remove_one(preq) ? 0 : -EALREADY; |
| 5856 | goto err; |
| 5857 | } |
| 5858 | |
Jens Axboe | cb3b200e | 2021-04-06 09:49:31 -0600 | [diff] [blame] | 5859 | /* |
| 5860 | * Don't allow racy completion with singleshot, as we cannot safely |
| 5861 | * update those. For multishot, if we're racing with completion, just |
| 5862 | * let completion re-add it. |
| 5863 | */ |
| 5864 | completing = !__io_poll_remove_one(preq, &preq->poll, false); |
| 5865 | if (completing && (preq->poll.events & EPOLLONESHOT)) { |
| 5866 | ret = -EALREADY; |
| 5867 | goto err; |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5868 | } |
| 5869 | /* we now have a detached poll request. reissue. */ |
| 5870 | ret = 0; |
| 5871 | err: |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5872 | if (ret < 0) { |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5873 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 5874 | req_set_fail(req); |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5875 | io_req_complete(req, ret); |
| 5876 | return 0; |
| 5877 | } |
| 5878 | /* only mask one event flags, keep behavior flags */ |
Pavel Begunkov | 9d80589 | 2021-04-13 02:58:40 +0100 | [diff] [blame] | 5879 | if (req->poll_update.update_events) { |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5880 | preq->poll.events &= ~0xffff; |
Pavel Begunkov | 9d80589 | 2021-04-13 02:58:40 +0100 | [diff] [blame] | 5881 | preq->poll.events |= req->poll_update.events & 0xffff; |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5882 | preq->poll.events |= IO_POLL_UNMASK; |
| 5883 | } |
Pavel Begunkov | 9d80589 | 2021-04-13 02:58:40 +0100 | [diff] [blame] | 5884 | if (req->poll_update.update_user_data) |
| 5885 | preq->user_data = req->poll_update.new_user_data; |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 5886 | spin_unlock(&ctx->completion_lock); |
Jens Axboe | cb3b200e | 2021-04-06 09:49:31 -0600 | [diff] [blame] | 5887 | |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5888 | /* complete update request, we're done with it */ |
| 5889 | io_req_complete(req, ret); |
| 5890 | |
Jens Axboe | cb3b200e | 2021-04-06 09:49:31 -0600 | [diff] [blame] | 5891 | if (!completing) { |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 5892 | ret = io_poll_add(preq, issue_flags); |
Jens Axboe | cb3b200e | 2021-04-06 09:49:31 -0600 | [diff] [blame] | 5893 | if (ret < 0) { |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 5894 | req_set_fail(preq); |
Jens Axboe | cb3b200e | 2021-04-06 09:49:31 -0600 | [diff] [blame] | 5895 | io_req_complete(preq, ret); |
| 5896 | } |
Jens Axboe | b69de28 | 2021-03-17 08:37:41 -0600 | [diff] [blame] | 5897 | } |
| 5898 | return 0; |
| 5899 | } |
| 5900 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 5901 | static void io_req_task_timeout(struct io_kiocb *req, bool *locked) |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 5902 | { |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 5903 | req_set_fail(req); |
Pavel Begunkov | 505657b | 2021-08-17 20:28:09 +0100 | [diff] [blame] | 5904 | io_req_complete_post(req, -ETIME, 0); |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 5905 | } |
| 5906 | |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 5907 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
| 5908 | { |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 5909 | struct io_timeout_data *data = container_of(timer, |
| 5910 | struct io_timeout_data, timer); |
| 5911 | struct io_kiocb *req = data->req; |
| 5912 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 5913 | unsigned long flags; |
| 5914 | |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 5915 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
Pavel Begunkov | a71976f | 2020-10-10 18:34:11 +0100 | [diff] [blame] | 5916 | list_del_init(&req->timeout.list); |
Pavel Begunkov | 01cec8c | 2020-07-30 18:43:50 +0300 | [diff] [blame] | 5917 | atomic_set(&req->ctx->cq_timeouts, |
| 5918 | atomic_read(&req->ctx->cq_timeouts) + 1); |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 5919 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
Pavel Begunkov | 01cec8c | 2020-07-30 18:43:50 +0300 | [diff] [blame] | 5920 | |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 5921 | req->io_task_work.func = io_req_task_timeout; |
| 5922 | io_req_task_work_add(req); |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 5923 | return HRTIMER_NORESTART; |
| 5924 | } |
| 5925 | |
Pavel Begunkov | fbd1584 | 2020-11-30 19:11:15 +0000 | [diff] [blame] | 5926 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
| 5927 | __u64 user_data) |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 5928 | __must_hold(&ctx->timeout_lock) |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 5929 | { |
Pavel Begunkov | fbd1584 | 2020-11-30 19:11:15 +0000 | [diff] [blame] | 5930 | struct io_timeout_data *io; |
Jens Axboe | f254ac0 | 2020-08-12 17:33:30 -0600 | [diff] [blame] | 5931 | struct io_kiocb *req; |
Pavel Begunkov | fd9c7bc | 2021-04-13 02:58:42 +0100 | [diff] [blame] | 5932 | bool found = false; |
Jens Axboe | f254ac0 | 2020-08-12 17:33:30 -0600 | [diff] [blame] | 5933 | |
| 5934 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
Pavel Begunkov | fd9c7bc | 2021-04-13 02:58:42 +0100 | [diff] [blame] | 5935 | found = user_data == req->user_data; |
| 5936 | if (found) |
Jens Axboe | f254ac0 | 2020-08-12 17:33:30 -0600 | [diff] [blame] | 5937 | break; |
Jens Axboe | f254ac0 | 2020-08-12 17:33:30 -0600 | [diff] [blame] | 5938 | } |
Pavel Begunkov | fd9c7bc | 2021-04-13 02:58:42 +0100 | [diff] [blame] | 5939 | if (!found) |
| 5940 | return ERR_PTR(-ENOENT); |
Jens Axboe | f254ac0 | 2020-08-12 17:33:30 -0600 | [diff] [blame] | 5941 | |
Pavel Begunkov | fbd1584 | 2020-11-30 19:11:15 +0000 | [diff] [blame] | 5942 | io = req->async_data; |
Pavel Begunkov | fd9c7bc | 2021-04-13 02:58:42 +0100 | [diff] [blame] | 5943 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
Pavel Begunkov | fbd1584 | 2020-11-30 19:11:15 +0000 | [diff] [blame] | 5944 | return ERR_PTR(-EALREADY); |
| 5945 | list_del_init(&req->timeout.list); |
| 5946 | return req; |
| 5947 | } |
| 5948 | |
| 5949 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
Pavel Begunkov | ec3c3d0 | 2021-08-18 10:50:52 +0100 | [diff] [blame] | 5950 | __must_hold(&ctx->completion_lock) |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 5951 | __must_hold(&ctx->timeout_lock) |
Pavel Begunkov | fbd1584 | 2020-11-30 19:11:15 +0000 | [diff] [blame] | 5952 | { |
| 5953 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
| 5954 | |
| 5955 | if (IS_ERR(req)) |
| 5956 | return PTR_ERR(req); |
| 5957 | |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 5958 | req_set_fail(req); |
Pavel Begunkov | d4d19c1 | 2021-04-25 14:32:17 +0100 | [diff] [blame] | 5959 | io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0); |
Pavel Begunkov | 91c2f69 | 2021-08-11 19:28:28 +0100 | [diff] [blame] | 5960 | io_put_req_deferred(req); |
Pavel Begunkov | fbd1584 | 2020-11-30 19:11:15 +0000 | [diff] [blame] | 5961 | return 0; |
Jens Axboe | f254ac0 | 2020-08-12 17:33:30 -0600 | [diff] [blame] | 5962 | } |
| 5963 | |
Jens Axboe | 50c1df2 | 2021-08-27 17:11:06 -0600 | [diff] [blame] | 5964 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
| 5965 | { |
| 5966 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { |
| 5967 | case IORING_TIMEOUT_BOOTTIME: |
| 5968 | return CLOCK_BOOTTIME; |
| 5969 | case IORING_TIMEOUT_REALTIME: |
| 5970 | return CLOCK_REALTIME; |
| 5971 | default: |
| 5972 | /* can't happen, vetted at prep time */ |
| 5973 | WARN_ON_ONCE(1); |
| 5974 | fallthrough; |
| 5975 | case 0: |
| 5976 | return CLOCK_MONOTONIC; |
| 5977 | } |
| 5978 | } |
| 5979 | |
Pavel Begunkov | f1042b6 | 2021-08-28 19:54:39 -0600 | [diff] [blame] | 5980 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
| 5981 | struct timespec64 *ts, enum hrtimer_mode mode) |
| 5982 | __must_hold(&ctx->timeout_lock) |
| 5983 | { |
| 5984 | struct io_timeout_data *io; |
| 5985 | struct io_kiocb *req; |
| 5986 | bool found = false; |
| 5987 | |
| 5988 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { |
| 5989 | found = user_data == req->user_data; |
| 5990 | if (found) |
| 5991 | break; |
| 5992 | } |
| 5993 | if (!found) |
| 5994 | return -ENOENT; |
| 5995 | |
| 5996 | io = req->async_data; |
| 5997 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
| 5998 | return -EALREADY; |
| 5999 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); |
| 6000 | io->timer.function = io_link_timeout_fn; |
| 6001 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); |
| 6002 | return 0; |
| 6003 | } |
| 6004 | |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 6005 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
| 6006 | struct timespec64 *ts, enum hrtimer_mode mode) |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 6007 | __must_hold(&ctx->timeout_lock) |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 6008 | { |
| 6009 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
| 6010 | struct io_timeout_data *data; |
| 6011 | |
| 6012 | if (IS_ERR(req)) |
| 6013 | return PTR_ERR(req); |
| 6014 | |
| 6015 | req->timeout.off = 0; /* noseq */ |
| 6016 | data = req->async_data; |
| 6017 | list_add_tail(&req->timeout.list, &ctx->timeout_list); |
Jens Axboe | 50c1df2 | 2021-08-27 17:11:06 -0600 | [diff] [blame] | 6018 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 6019 | data->timer.function = io_timeout_fn; |
| 6020 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); |
| 6021 | return 0; |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 6022 | } |
| 6023 | |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 6024 | static int io_timeout_remove_prep(struct io_kiocb *req, |
| 6025 | const struct io_uring_sqe *sqe) |
Jens Axboe | b29472e | 2019-12-17 18:50:29 -0700 | [diff] [blame] | 6026 | { |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 6027 | struct io_timeout_rem *tr = &req->timeout_rem; |
| 6028 | |
Jens Axboe | b29472e | 2019-12-17 18:50:29 -0700 | [diff] [blame] | 6029 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
| 6030 | return -EINVAL; |
Daniele Albano | 61710e4 | 2020-07-18 14:15:16 -0600 | [diff] [blame] | 6031 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
| 6032 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 6033 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) |
Jens Axboe | b29472e | 2019-12-17 18:50:29 -0700 | [diff] [blame] | 6034 | return -EINVAL; |
| 6035 | |
Pavel Begunkov | f1042b6 | 2021-08-28 19:54:39 -0600 | [diff] [blame] | 6036 | tr->ltimeout = false; |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 6037 | tr->addr = READ_ONCE(sqe->addr); |
| 6038 | tr->flags = READ_ONCE(sqe->timeout_flags); |
Pavel Begunkov | f1042b6 | 2021-08-28 19:54:39 -0600 | [diff] [blame] | 6039 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
| 6040 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) |
| 6041 | return -EINVAL; |
| 6042 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) |
| 6043 | tr->ltimeout = true; |
| 6044 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 6045 | return -EINVAL; |
| 6046 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) |
| 6047 | return -EFAULT; |
| 6048 | } else if (tr->flags) { |
| 6049 | /* timeout removal doesn't support flags */ |
| 6050 | return -EINVAL; |
| 6051 | } |
| 6052 | |
Jens Axboe | b29472e | 2019-12-17 18:50:29 -0700 | [diff] [blame] | 6053 | return 0; |
| 6054 | } |
| 6055 | |
Pavel Begunkov | 8662dae | 2021-01-19 13:32:44 +0000 | [diff] [blame] | 6056 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
| 6057 | { |
| 6058 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS |
| 6059 | : HRTIMER_MODE_REL; |
| 6060 | } |
| 6061 | |
Jens Axboe | 1136504 | 2019-10-16 09:08:32 -0600 | [diff] [blame] | 6062 | /* |
| 6063 | * Remove or update an existing timeout command |
| 6064 | */ |
Pavel Begunkov | 61e9820 | 2021-02-10 00:03:08 +0000 | [diff] [blame] | 6065 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 1136504 | 2019-10-16 09:08:32 -0600 | [diff] [blame] | 6066 | { |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 6067 | struct io_timeout_rem *tr = &req->timeout_rem; |
Jens Axboe | 1136504 | 2019-10-16 09:08:32 -0600 | [diff] [blame] | 6068 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 6069 | int ret; |
Jens Axboe | 1136504 | 2019-10-16 09:08:32 -0600 | [diff] [blame] | 6070 | |
Pavel Begunkov | ec3c3d0 | 2021-08-18 10:50:52 +0100 | [diff] [blame] | 6071 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
| 6072 | spin_lock(&ctx->completion_lock); |
| 6073 | spin_lock_irq(&ctx->timeout_lock); |
Pavel Begunkov | 9c8e11b | 2020-11-30 19:11:16 +0000 | [diff] [blame] | 6074 | ret = io_timeout_cancel(ctx, tr->addr); |
Pavel Begunkov | ec3c3d0 | 2021-08-18 10:50:52 +0100 | [diff] [blame] | 6075 | spin_unlock_irq(&ctx->timeout_lock); |
| 6076 | spin_unlock(&ctx->completion_lock); |
| 6077 | } else { |
Pavel Begunkov | f1042b6 | 2021-08-28 19:54:39 -0600 | [diff] [blame] | 6078 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
| 6079 | |
Pavel Begunkov | ec3c3d0 | 2021-08-18 10:50:52 +0100 | [diff] [blame] | 6080 | spin_lock_irq(&ctx->timeout_lock); |
Pavel Begunkov | f1042b6 | 2021-08-28 19:54:39 -0600 | [diff] [blame] | 6081 | if (tr->ltimeout) |
| 6082 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); |
| 6083 | else |
| 6084 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); |
Pavel Begunkov | ec3c3d0 | 2021-08-18 10:50:52 +0100 | [diff] [blame] | 6085 | spin_unlock_irq(&ctx->timeout_lock); |
| 6086 | } |
Jens Axboe | 1136504 | 2019-10-16 09:08:32 -0600 | [diff] [blame] | 6087 | |
Jens Axboe | 4e88d6e | 2019-12-07 20:59:47 -0700 | [diff] [blame] | 6088 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 6089 | req_set_fail(req); |
Pavel Begunkov | 505657b | 2021-08-17 20:28:09 +0100 | [diff] [blame] | 6090 | io_req_complete_post(req, ret, 0); |
Jens Axboe | 1136504 | 2019-10-16 09:08:32 -0600 | [diff] [blame] | 6091 | return 0; |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6092 | } |
| 6093 | |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 6094 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
Jens Axboe | 2d28390 | 2019-12-04 11:08:05 -0700 | [diff] [blame] | 6095 | bool is_timeout_link) |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6096 | { |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6097 | struct io_timeout_data *data; |
Jens Axboe | a41525a | 2019-10-15 16:48:15 -0600 | [diff] [blame] | 6098 | unsigned flags; |
Pavel Begunkov | 56080b0 | 2020-05-26 20:34:04 +0300 | [diff] [blame] | 6099 | u32 off = READ_ONCE(sqe->off); |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6100 | |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6101 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6102 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 6103 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || |
| 6104 | sqe->splice_fd_in) |
Jens Axboe | a41525a | 2019-10-15 16:48:15 -0600 | [diff] [blame] | 6105 | return -EINVAL; |
Pavel Begunkov | 56080b0 | 2020-05-26 20:34:04 +0300 | [diff] [blame] | 6106 | if (off && is_timeout_link) |
Jens Axboe | 2d28390 | 2019-12-04 11:08:05 -0700 | [diff] [blame] | 6107 | return -EINVAL; |
Jens Axboe | a41525a | 2019-10-15 16:48:15 -0600 | [diff] [blame] | 6108 | flags = READ_ONCE(sqe->timeout_flags); |
Jens Axboe | 50c1df2 | 2021-08-27 17:11:06 -0600 | [diff] [blame] | 6109 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK)) |
| 6110 | return -EINVAL; |
| 6111 | /* more than one clock specified is invalid, obviously */ |
| 6112 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6113 | return -EINVAL; |
Arnd Bergmann | bdf2007 | 2019-10-01 09:53:29 -0600 | [diff] [blame] | 6114 | |
Pavel Begunkov | ef9dd63 | 2021-08-28 19:54:38 -0600 | [diff] [blame] | 6115 | INIT_LIST_HEAD(&req->timeout.list); |
Pavel Begunkov | bfe68a2 | 2020-05-30 14:54:18 +0300 | [diff] [blame] | 6116 | req->timeout.off = off; |
Pavel Begunkov | f18ee4c | 2021-06-14 23:37:25 +0100 | [diff] [blame] | 6117 | if (unlikely(off && !req->ctx->off_timeout_used)) |
| 6118 | req->ctx->off_timeout_used = true; |
Jens Axboe | 26a6167 | 2019-12-20 09:02:01 -0700 | [diff] [blame] | 6119 | |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 6120 | if (!req->async_data && io_alloc_async_data(req)) |
Jens Axboe | 26a6167 | 2019-12-20 09:02:01 -0700 | [diff] [blame] | 6121 | return -ENOMEM; |
| 6122 | |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 6123 | data = req->async_data; |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6124 | data->req = req; |
Jens Axboe | 50c1df2 | 2021-08-27 17:11:06 -0600 | [diff] [blame] | 6125 | data->flags = flags; |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6126 | |
| 6127 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6128 | return -EFAULT; |
| 6129 | |
Pavel Begunkov | 8662dae | 2021-01-19 13:32:44 +0000 | [diff] [blame] | 6130 | data->mode = io_translate_timeout_mode(flags); |
Jens Axboe | 50c1df2 | 2021-08-27 17:11:06 -0600 | [diff] [blame] | 6131 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
Pavel Begunkov | b97e736 | 2021-08-15 10:40:23 +0100 | [diff] [blame] | 6132 | |
| 6133 | if (is_timeout_link) { |
| 6134 | struct io_submit_link *link = &req->ctx->submit_state.link; |
| 6135 | |
| 6136 | if (!link->head) |
| 6137 | return -EINVAL; |
| 6138 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) |
| 6139 | return -EINVAL; |
Pavel Begunkov | 4d13d1a | 2021-08-15 10:40:24 +0100 | [diff] [blame] | 6140 | req->timeout.head = link->last; |
| 6141 | link->last->flags |= REQ_F_ARM_LTIMEOUT; |
Pavel Begunkov | b97e736 | 2021-08-15 10:40:23 +0100 | [diff] [blame] | 6142 | } |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6143 | return 0; |
| 6144 | } |
| 6145 | |
Pavel Begunkov | 61e9820 | 2021-02-10 00:03:08 +0000 | [diff] [blame] | 6146 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6147 | { |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6148 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 6149 | struct io_timeout_data *data = req->async_data; |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6150 | struct list_head *entry; |
Pavel Begunkov | bfe68a2 | 2020-05-30 14:54:18 +0300 | [diff] [blame] | 6151 | u32 tail, off = req->timeout.off; |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6152 | |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 6153 | spin_lock_irq(&ctx->timeout_lock); |
Jens Axboe | 93bd25b | 2019-11-11 23:34:31 -0700 | [diff] [blame] | 6154 | |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6155 | /* |
| 6156 | * sqe->off holds how many events that need to occur for this |
Jens Axboe | 93bd25b | 2019-11-11 23:34:31 -0700 | [diff] [blame] | 6157 | * timeout event to be satisfied. If it isn't set, then this is |
| 6158 | * a pure timeout request, sequence isn't used. |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6159 | */ |
Pavel Begunkov | 8eb7e2d | 2020-06-29 13:13:02 +0300 | [diff] [blame] | 6160 | if (io_is_timeout_noseq(req)) { |
Jens Axboe | 93bd25b | 2019-11-11 23:34:31 -0700 | [diff] [blame] | 6161 | entry = ctx->timeout_list.prev; |
| 6162 | goto add; |
| 6163 | } |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6164 | |
Pavel Begunkov | bfe68a2 | 2020-05-30 14:54:18 +0300 | [diff] [blame] | 6165 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
| 6166 | req->timeout.target_seq = tail + off; |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6167 | |
Marcelo Diop-Gonzalez | f010505 | 2021-01-15 11:54:40 -0500 | [diff] [blame] | 6168 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
| 6169 | * This is safe because ->completion_lock is held, and submissions |
| 6170 | * and completions are never mixed in the same ->completion_lock section. |
| 6171 | */ |
| 6172 | ctx->cq_last_tm_flush = tail; |
| 6173 | |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6174 | /* |
| 6175 | * Insertion sort, ensuring the first entry in the list is always |
| 6176 | * the one we need first. |
| 6177 | */ |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6178 | list_for_each_prev(entry, &ctx->timeout_list) { |
Pavel Begunkov | 135fcde | 2020-07-13 23:37:12 +0300 | [diff] [blame] | 6179 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
| 6180 | timeout.list); |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6181 | |
Pavel Begunkov | 8eb7e2d | 2020-06-29 13:13:02 +0300 | [diff] [blame] | 6182 | if (io_is_timeout_noseq(nxt)) |
Jens Axboe | 93bd25b | 2019-11-11 23:34:31 -0700 | [diff] [blame] | 6183 | continue; |
Pavel Begunkov | bfe68a2 | 2020-05-30 14:54:18 +0300 | [diff] [blame] | 6184 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
| 6185 | if (off >= nxt->timeout.target_seq - tail) |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6186 | break; |
| 6187 | } |
Jens Axboe | 93bd25b | 2019-11-11 23:34:31 -0700 | [diff] [blame] | 6188 | add: |
Pavel Begunkov | 135fcde | 2020-07-13 23:37:12 +0300 | [diff] [blame] | 6189 | list_add(&req->timeout.list, entry); |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6190 | data->timer.function = io_timeout_fn; |
| 6191 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); |
Jens Axboe | 89850fc | 2021-08-10 15:11:51 -0600 | [diff] [blame] | 6192 | spin_unlock_irq(&ctx->timeout_lock); |
Jens Axboe | 5262f56 | 2019-09-17 12:26:57 -0600 | [diff] [blame] | 6193 | return 0; |
| 6194 | } |
| 6195 | |
Pavel Begunkov | f458dd84 | 2021-03-08 12:14:14 +0000 | [diff] [blame] | 6196 | struct io_cancel_data { |
| 6197 | struct io_ring_ctx *ctx; |
| 6198 | u64 user_data; |
| 6199 | }; |
| 6200 | |
Jens Axboe | 62755e3 | 2019-10-28 21:49:21 -0600 | [diff] [blame] | 6201 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
Jens Axboe | de0617e | 2019-04-06 21:51:27 -0600 | [diff] [blame] | 6202 | { |
Jens Axboe | 62755e3 | 2019-10-28 21:49:21 -0600 | [diff] [blame] | 6203 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
Pavel Begunkov | f458dd84 | 2021-03-08 12:14:14 +0000 | [diff] [blame] | 6204 | struct io_cancel_data *cd = data; |
Jens Axboe | de0617e | 2019-04-06 21:51:27 -0600 | [diff] [blame] | 6205 | |
Pavel Begunkov | f458dd84 | 2021-03-08 12:14:14 +0000 | [diff] [blame] | 6206 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
Jens Axboe | 62755e3 | 2019-10-28 21:49:21 -0600 | [diff] [blame] | 6207 | } |
| 6208 | |
Pavel Begunkov | f458dd84 | 2021-03-08 12:14:14 +0000 | [diff] [blame] | 6209 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
| 6210 | struct io_ring_ctx *ctx) |
Jens Axboe | 62755e3 | 2019-10-28 21:49:21 -0600 | [diff] [blame] | 6211 | { |
Pavel Begunkov | f458dd84 | 2021-03-08 12:14:14 +0000 | [diff] [blame] | 6212 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
Jens Axboe | 62755e3 | 2019-10-28 21:49:21 -0600 | [diff] [blame] | 6213 | enum io_wq_cancel cancel_ret; |
Jens Axboe | 62755e3 | 2019-10-28 21:49:21 -0600 | [diff] [blame] | 6214 | int ret = 0; |
| 6215 | |
Pavel Begunkov | f458dd84 | 2021-03-08 12:14:14 +0000 | [diff] [blame] | 6216 | if (!tctx || !tctx->io_wq) |
Jens Axboe | 5aa75ed | 2021-02-16 12:56:50 -0700 | [diff] [blame] | 6217 | return -ENOENT; |
| 6218 | |
Pavel Begunkov | f458dd84 | 2021-03-08 12:14:14 +0000 | [diff] [blame] | 6219 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
Jens Axboe | 62755e3 | 2019-10-28 21:49:21 -0600 | [diff] [blame] | 6220 | switch (cancel_ret) { |
| 6221 | case IO_WQ_CANCEL_OK: |
| 6222 | ret = 0; |
| 6223 | break; |
| 6224 | case IO_WQ_CANCEL_RUNNING: |
| 6225 | ret = -EALREADY; |
| 6226 | break; |
| 6227 | case IO_WQ_CANCEL_NOTFOUND: |
| 6228 | ret = -ENOENT; |
| 6229 | break; |
| 6230 | } |
| 6231 | |
Jens Axboe | e977d6d | 2019-11-05 12:39:45 -0700 | [diff] [blame] | 6232 | return ret; |
| 6233 | } |
| 6234 | |
Pavel Begunkov | 8cb01fa | 2021-08-15 10:40:22 +0100 | [diff] [blame] | 6235 | static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 6236 | { |
Pavel Begunkov | 8cb01fa | 2021-08-15 10:40:22 +0100 | [diff] [blame] | 6237 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 6238 | int ret; |
| 6239 | |
Pavel Begunkov | dadebc3 | 2021-08-23 13:30:44 +0100 | [diff] [blame] | 6240 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
Pavel Begunkov | 8cb01fa | 2021-08-15 10:40:22 +0100 | [diff] [blame] | 6241 | |
Pavel Begunkov | f458dd84 | 2021-03-08 12:14:14 +0000 | [diff] [blame] | 6242 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
Pavel Begunkov | df9727a | 2021-04-01 15:43:59 +0100 | [diff] [blame] | 6243 | if (ret != -ENOENT) |
Pavel Begunkov | 8cb01fa | 2021-08-15 10:40:22 +0100 | [diff] [blame] | 6244 | return ret; |
Pavel Begunkov | 505657b | 2021-08-17 20:28:09 +0100 | [diff] [blame] | 6245 | |
| 6246 | spin_lock(&ctx->completion_lock); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 6247 | spin_lock_irq(&ctx->timeout_lock); |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 6248 | ret = io_timeout_cancel(ctx, sqe_addr); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 6249 | spin_unlock_irq(&ctx->timeout_lock); |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 6250 | if (ret != -ENOENT) |
Pavel Begunkov | 505657b | 2021-08-17 20:28:09 +0100 | [diff] [blame] | 6251 | goto out; |
| 6252 | ret = io_poll_cancel(ctx, sqe_addr, false); |
| 6253 | out: |
| 6254 | spin_unlock(&ctx->completion_lock); |
| 6255 | return ret; |
Jens Axboe | 47f4676 | 2019-11-09 17:43:02 -0700 | [diff] [blame] | 6256 | } |
| 6257 | |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 6258 | static int io_async_cancel_prep(struct io_kiocb *req, |
| 6259 | const struct io_uring_sqe *sqe) |
Jens Axboe | e977d6d | 2019-11-05 12:39:45 -0700 | [diff] [blame] | 6260 | { |
Jens Axboe | fbf2384 | 2019-12-17 18:45:56 -0700 | [diff] [blame] | 6261 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
Jens Axboe | e977d6d | 2019-11-05 12:39:45 -0700 | [diff] [blame] | 6262 | return -EINVAL; |
Daniele Albano | 61710e4 | 2020-07-18 14:15:16 -0600 | [diff] [blame] | 6263 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
| 6264 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 6265 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || |
| 6266 | sqe->splice_fd_in) |
Jens Axboe | e977d6d | 2019-11-05 12:39:45 -0700 | [diff] [blame] | 6267 | return -EINVAL; |
| 6268 | |
Jens Axboe | fbf2384 | 2019-12-17 18:45:56 -0700 | [diff] [blame] | 6269 | req->cancel.addr = READ_ONCE(sqe->addr); |
| 6270 | return 0; |
| 6271 | } |
| 6272 | |
Pavel Begunkov | 61e9820 | 2021-02-10 00:03:08 +0000 | [diff] [blame] | 6273 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | fbf2384 | 2019-12-17 18:45:56 -0700 | [diff] [blame] | 6274 | { |
| 6275 | struct io_ring_ctx *ctx = req->ctx; |
Pavel Begunkov | 58f9937 | 2021-03-12 16:25:55 +0000 | [diff] [blame] | 6276 | u64 sqe_addr = req->cancel.addr; |
| 6277 | struct io_tctx_node *node; |
| 6278 | int ret; |
Jens Axboe | fbf2384 | 2019-12-17 18:45:56 -0700 | [diff] [blame] | 6279 | |
Pavel Begunkov | 8cb01fa | 2021-08-15 10:40:22 +0100 | [diff] [blame] | 6280 | ret = io_try_cancel_userdata(req, sqe_addr); |
Pavel Begunkov | 58f9937 | 2021-03-12 16:25:55 +0000 | [diff] [blame] | 6281 | if (ret != -ENOENT) |
| 6282 | goto done; |
Pavel Begunkov | 58f9937 | 2021-03-12 16:25:55 +0000 | [diff] [blame] | 6283 | |
| 6284 | /* slow path, try all io-wq's */ |
| 6285 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); |
| 6286 | ret = -ENOENT; |
| 6287 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { |
| 6288 | struct io_uring_task *tctx = node->task->io_uring; |
| 6289 | |
Pavel Begunkov | 58f9937 | 2021-03-12 16:25:55 +0000 | [diff] [blame] | 6290 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
| 6291 | if (ret != -ENOENT) |
| 6292 | break; |
| 6293 | } |
| 6294 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); |
Pavel Begunkov | 58f9937 | 2021-03-12 16:25:55 +0000 | [diff] [blame] | 6295 | done: |
Pavel Begunkov | 58f9937 | 2021-03-12 16:25:55 +0000 | [diff] [blame] | 6296 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 6297 | req_set_fail(req); |
Pavel Begunkov | 505657b | 2021-08-17 20:28:09 +0100 | [diff] [blame] | 6298 | io_req_complete_post(req, ret, 0); |
Jens Axboe | 62755e3 | 2019-10-28 21:49:21 -0600 | [diff] [blame] | 6299 | return 0; |
| 6300 | } |
| 6301 | |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 6302 | static int io_rsrc_update_prep(struct io_kiocb *req, |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6303 | const struct io_uring_sqe *sqe) |
| 6304 | { |
Daniele Albano | 61710e4 | 2020-07-18 14:15:16 -0600 | [diff] [blame] | 6305 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
| 6306 | return -EINVAL; |
Pavel Begunkov | 26578cd | 2021-08-20 10:36:37 +0100 | [diff] [blame] | 6307 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6308 | return -EINVAL; |
| 6309 | |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 6310 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
| 6311 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); |
| 6312 | if (!req->rsrc_update.nr_args) |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6313 | return -EINVAL; |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 6314 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6315 | return 0; |
| 6316 | } |
| 6317 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6318 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6319 | { |
| 6320 | struct io_ring_ctx *ctx = req->ctx; |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 6321 | struct io_uring_rsrc_update2 up; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6322 | int ret; |
| 6323 | |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6324 | if (issue_flags & IO_URING_F_NONBLOCK) |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6325 | return -EAGAIN; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6326 | |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 6327 | up.offset = req->rsrc_update.offset; |
| 6328 | up.data = req->rsrc_update.arg; |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 6329 | up.nr = 0; |
| 6330 | up.tags = 0; |
Colin Ian King | 615cee4 | 2021-04-26 10:47:35 +0100 | [diff] [blame] | 6331 | up.resv = 0; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6332 | |
| 6333 | mutex_lock(&ctx->uring_lock); |
Pavel Begunkov | fdecb66 | 2021-04-25 14:32:20 +0100 | [diff] [blame] | 6334 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 6335 | &up, req->rsrc_update.nr_args); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6336 | mutex_unlock(&ctx->uring_lock); |
| 6337 | |
| 6338 | if (ret < 0) |
Pavel Begunkov | 93d2bcd | 2021-05-16 22:58:05 +0100 | [diff] [blame] | 6339 | req_set_fail(req); |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6340 | __io_req_complete(req, issue_flags, ret, 0); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6341 | return 0; |
| 6342 | } |
| 6343 | |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6344 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 6345 | { |
Jens Axboe | d625c6e | 2019-12-17 19:53:05 -0700 | [diff] [blame] | 6346 | switch (req->opcode) { |
Jens Axboe | e781573 | 2019-12-17 19:45:06 -0700 | [diff] [blame] | 6347 | case IORING_OP_NOP: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6348 | return 0; |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 6349 | case IORING_OP_READV: |
| 6350 | case IORING_OP_READ_FIXED: |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 6351 | case IORING_OP_READ: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6352 | return io_read_prep(req, sqe); |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 6353 | case IORING_OP_WRITEV: |
| 6354 | case IORING_OP_WRITE_FIXED: |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 6355 | case IORING_OP_WRITE: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6356 | return io_write_prep(req, sqe); |
Jens Axboe | 0969e78 | 2019-12-17 18:40:57 -0700 | [diff] [blame] | 6357 | case IORING_OP_POLL_ADD: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6358 | return io_poll_add_prep(req, sqe); |
Jens Axboe | 0969e78 | 2019-12-17 18:40:57 -0700 | [diff] [blame] | 6359 | case IORING_OP_POLL_REMOVE: |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 6360 | return io_poll_update_prep(req, sqe); |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 6361 | case IORING_OP_FSYNC: |
Pavel Begunkov | 1155c76 | 2021-02-18 18:29:38 +0000 | [diff] [blame] | 6362 | return io_fsync_prep(req, sqe); |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 6363 | case IORING_OP_SYNC_FILE_RANGE: |
Pavel Begunkov | 1155c76 | 2021-02-18 18:29:38 +0000 | [diff] [blame] | 6364 | return io_sfr_prep(req, sqe); |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 6365 | case IORING_OP_SENDMSG: |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 6366 | case IORING_OP_SEND: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6367 | return io_sendmsg_prep(req, sqe); |
Jens Axboe | 03b1230 | 2019-12-02 18:50:25 -0700 | [diff] [blame] | 6368 | case IORING_OP_RECVMSG: |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 6369 | case IORING_OP_RECV: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6370 | return io_recvmsg_prep(req, sqe); |
Jens Axboe | f499a02 | 2019-12-02 16:28:46 -0700 | [diff] [blame] | 6371 | case IORING_OP_CONNECT: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6372 | return io_connect_prep(req, sqe); |
Jens Axboe | 2d28390 | 2019-12-04 11:08:05 -0700 | [diff] [blame] | 6373 | case IORING_OP_TIMEOUT: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6374 | return io_timeout_prep(req, sqe, false); |
Jens Axboe | b29472e | 2019-12-17 18:50:29 -0700 | [diff] [blame] | 6375 | case IORING_OP_TIMEOUT_REMOVE: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6376 | return io_timeout_remove_prep(req, sqe); |
Jens Axboe | fbf2384 | 2019-12-17 18:45:56 -0700 | [diff] [blame] | 6377 | case IORING_OP_ASYNC_CANCEL: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6378 | return io_async_cancel_prep(req, sqe); |
Jens Axboe | 2d28390 | 2019-12-04 11:08:05 -0700 | [diff] [blame] | 6379 | case IORING_OP_LINK_TIMEOUT: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6380 | return io_timeout_prep(req, sqe, true); |
Jens Axboe | 8ed8d3c | 2019-12-16 11:55:28 -0700 | [diff] [blame] | 6381 | case IORING_OP_ACCEPT: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6382 | return io_accept_prep(req, sqe); |
Jens Axboe | d63d1b5 | 2019-12-10 10:38:56 -0700 | [diff] [blame] | 6383 | case IORING_OP_FALLOCATE: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6384 | return io_fallocate_prep(req, sqe); |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 6385 | case IORING_OP_OPENAT: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6386 | return io_openat_prep(req, sqe); |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 6387 | case IORING_OP_CLOSE: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6388 | return io_close_prep(req, sqe); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6389 | case IORING_OP_FILES_UPDATE: |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 6390 | return io_rsrc_update_prep(req, sqe); |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 6391 | case IORING_OP_STATX: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6392 | return io_statx_prep(req, sqe); |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 6393 | case IORING_OP_FADVISE: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6394 | return io_fadvise_prep(req, sqe); |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 6395 | case IORING_OP_MADVISE: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6396 | return io_madvise_prep(req, sqe); |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 6397 | case IORING_OP_OPENAT2: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6398 | return io_openat2_prep(req, sqe); |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 6399 | case IORING_OP_EPOLL_CTL: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6400 | return io_epoll_ctl_prep(req, sqe); |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 6401 | case IORING_OP_SPLICE: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6402 | return io_splice_prep(req, sqe); |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 6403 | case IORING_OP_PROVIDE_BUFFERS: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6404 | return io_provide_buffers_prep(req, sqe); |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 6405 | case IORING_OP_REMOVE_BUFFERS: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6406 | return io_remove_buffers_prep(req, sqe); |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 6407 | case IORING_OP_TEE: |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6408 | return io_tee_prep(req, sqe); |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 6409 | case IORING_OP_SHUTDOWN: |
| 6410 | return io_shutdown_prep(req, sqe); |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 6411 | case IORING_OP_RENAMEAT: |
| 6412 | return io_renameat_prep(req, sqe); |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 6413 | case IORING_OP_UNLINKAT: |
| 6414 | return io_unlinkat_prep(req, sqe); |
Dmitry Kadashev | e34a02d | 2021-07-08 13:34:45 +0700 | [diff] [blame] | 6415 | case IORING_OP_MKDIRAT: |
| 6416 | return io_mkdirat_prep(req, sqe); |
Dmitry Kadashev | 7a8721f | 2021-07-08 13:34:46 +0700 | [diff] [blame] | 6417 | case IORING_OP_SYMLINKAT: |
| 6418 | return io_symlinkat_prep(req, sqe); |
Dmitry Kadashev | cf30da9 | 2021-07-08 13:34:47 +0700 | [diff] [blame] | 6419 | case IORING_OP_LINKAT: |
| 6420 | return io_linkat_prep(req, sqe); |
Jens Axboe | f67676d | 2019-12-02 11:03:47 -0700 | [diff] [blame] | 6421 | } |
| 6422 | |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6423 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
| 6424 | req->opcode); |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 6425 | return -EINVAL; |
Pavel Begunkov | bfe7655 | 2020-09-30 22:57:55 +0300 | [diff] [blame] | 6426 | } |
| 6427 | |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 6428 | static int io_req_prep_async(struct io_kiocb *req) |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 6429 | { |
Pavel Begunkov | b7e298d | 2021-02-28 22:35:19 +0000 | [diff] [blame] | 6430 | if (!io_op_defs[req->opcode].needs_async_setup) |
| 6431 | return 0; |
| 6432 | if (WARN_ON_ONCE(req->async_data)) |
| 6433 | return -EFAULT; |
| 6434 | if (io_alloc_async_data(req)) |
| 6435 | return -EAGAIN; |
| 6436 | |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 6437 | switch (req->opcode) { |
| 6438 | case IORING_OP_READV: |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 6439 | return io_rw_prep_async(req, READ); |
| 6440 | case IORING_OP_WRITEV: |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 6441 | return io_rw_prep_async(req, WRITE); |
| 6442 | case IORING_OP_SENDMSG: |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 6443 | return io_sendmsg_prep_async(req); |
| 6444 | case IORING_OP_RECVMSG: |
Pavel Begunkov | 93642ef | 2021-02-18 18:29:44 +0000 | [diff] [blame] | 6445 | return io_recvmsg_prep_async(req); |
| 6446 | case IORING_OP_CONNECT: |
| 6447 | return io_connect_prep_async(req); |
| 6448 | } |
Pavel Begunkov | b7e298d | 2021-02-28 22:35:19 +0000 | [diff] [blame] | 6449 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
| 6450 | req->opcode); |
| 6451 | return -EFAULT; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 6452 | } |
| 6453 | |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 6454 | static u32 io_get_sequence(struct io_kiocb *req) |
| 6455 | { |
Pavel Begunkov | a3dbdf5 | 2021-06-17 18:14:05 +0100 | [diff] [blame] | 6456 | u32 seq = req->ctx->cached_sq_head; |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 6457 | |
Pavel Begunkov | a3dbdf5 | 2021-06-17 18:14:05 +0100 | [diff] [blame] | 6458 | /* need original cached_sq_head, but it was increased for each req */ |
| 6459 | io_for_each_link(req, req) |
| 6460 | seq--; |
| 6461 | return seq; |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 6462 | } |
| 6463 | |
Pavel Begunkov | 76cc33d | 2021-06-14 23:37:30 +0100 | [diff] [blame] | 6464 | static bool io_drain_req(struct io_kiocb *req) |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 6465 | { |
Pavel Begunkov | 3c19966 | 2021-06-15 16:47:57 +0100 | [diff] [blame] | 6466 | struct io_kiocb *pos; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 6467 | struct io_ring_ctx *ctx = req->ctx; |
Pavel Begunkov | 27dc833 | 2020-07-13 23:37:14 +0300 | [diff] [blame] | 6468 | struct io_defer_entry *de; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 6469 | int ret; |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 6470 | u32 seq; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 6471 | |
Pavel Begunkov | b8ce1b9 | 2021-08-31 14:13:11 +0100 | [diff] [blame] | 6472 | if (req->flags & REQ_F_FAIL) { |
| 6473 | io_req_complete_fail_submit(req); |
| 6474 | return true; |
| 6475 | } |
| 6476 | |
Pavel Begunkov | 3c19966 | 2021-06-15 16:47:57 +0100 | [diff] [blame] | 6477 | /* |
| 6478 | * If we need to drain a request in the middle of a link, drain the |
| 6479 | * head request and the next request/link after the current link. |
| 6480 | * Considering sequential execution of links, IOSQE_IO_DRAIN will be |
| 6481 | * maintained for every request of our link. |
| 6482 | */ |
| 6483 | if (ctx->drain_next) { |
| 6484 | req->flags |= REQ_F_IO_DRAIN; |
| 6485 | ctx->drain_next = false; |
| 6486 | } |
| 6487 | /* not interested in head, start from the first linked */ |
| 6488 | io_for_each_link(pos, req->link) { |
| 6489 | if (pos->flags & REQ_F_IO_DRAIN) { |
| 6490 | ctx->drain_next = true; |
| 6491 | req->flags |= REQ_F_IO_DRAIN; |
| 6492 | break; |
| 6493 | } |
| 6494 | } |
| 6495 | |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 6496 | /* Still need defer if there is pending req in defer list. */ |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 6497 | if (likely(list_empty_careful(&ctx->defer_list) && |
Pavel Begunkov | 10c6690 | 2021-06-15 16:47:56 +0100 | [diff] [blame] | 6498 | !(req->flags & REQ_F_IO_DRAIN))) { |
| 6499 | ctx->drain_active = false; |
Pavel Begunkov | 76cc33d | 2021-06-14 23:37:30 +0100 | [diff] [blame] | 6500 | return false; |
Pavel Begunkov | 10c6690 | 2021-06-15 16:47:56 +0100 | [diff] [blame] | 6501 | } |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 6502 | |
| 6503 | seq = io_get_sequence(req); |
| 6504 | /* Still a chance to pass the sequence check */ |
| 6505 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) |
Pavel Begunkov | 76cc33d | 2021-06-14 23:37:30 +0100 | [diff] [blame] | 6506 | return false; |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 6507 | |
Pavel Begunkov | b7e298d | 2021-02-28 22:35:19 +0000 | [diff] [blame] | 6508 | ret = io_req_prep_async(req); |
Pavel Begunkov | be7053b | 2021-02-18 18:29:45 +0000 | [diff] [blame] | 6509 | if (ret) |
Pavel Begunkov | 1b48773 | 2021-07-11 22:41:13 +0100 | [diff] [blame] | 6510 | goto fail; |
Pavel Begunkov | cbdcb43 | 2020-06-29 19:18:43 +0300 | [diff] [blame] | 6511 | io_prep_async_link(req); |
Pavel Begunkov | 27dc833 | 2020-07-13 23:37:14 +0300 | [diff] [blame] | 6512 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
Pavel Begunkov | 76cc33d | 2021-06-14 23:37:30 +0100 | [diff] [blame] | 6513 | if (!de) { |
Pavel Begunkov | 1b48773 | 2021-07-11 22:41:13 +0100 | [diff] [blame] | 6514 | ret = -ENOMEM; |
| 6515 | fail: |
| 6516 | io_req_complete_failed(req, ret); |
Pavel Begunkov | 76cc33d | 2021-06-14 23:37:30 +0100 | [diff] [blame] | 6517 | return true; |
| 6518 | } |
Jens Axboe | 31b5151 | 2019-01-18 22:56:34 -0700 | [diff] [blame] | 6519 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 6520 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 6521 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 6522 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | 27dc833 | 2020-07-13 23:37:14 +0300 | [diff] [blame] | 6523 | kfree(de); |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 6524 | io_queue_async_work(req, NULL); |
Pavel Begunkov | 76cc33d | 2021-06-14 23:37:30 +0100 | [diff] [blame] | 6525 | return true; |
Jens Axboe | 31b5151 | 2019-01-18 22:56:34 -0700 | [diff] [blame] | 6526 | } |
| 6527 | |
| 6528 | trace_io_uring_defer(ctx, req, req->user_data); |
Pavel Begunkov | 27dc833 | 2020-07-13 23:37:14 +0300 | [diff] [blame] | 6529 | de->req = req; |
Pavel Begunkov | 9cf7c10 | 2020-07-13 23:37:15 +0300 | [diff] [blame] | 6530 | de->seq = seq; |
Pavel Begunkov | 27dc833 | 2020-07-13 23:37:14 +0300 | [diff] [blame] | 6531 | list_add_tail(&de->list, &ctx->defer_list); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 6532 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | 76cc33d | 2021-06-14 23:37:30 +0100 | [diff] [blame] | 6533 | return true; |
Jens Axboe | 31b5151 | 2019-01-18 22:56:34 -0700 | [diff] [blame] | 6534 | } |
| 6535 | |
Pavel Begunkov | 68fb897 | 2021-03-19 17:22:41 +0000 | [diff] [blame] | 6536 | static void io_clean_op(struct io_kiocb *req) |
Pavel Begunkov | 99bc4c3 | 2020-02-07 22:04:45 +0300 | [diff] [blame] | 6537 | { |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6538 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
| 6539 | switch (req->opcode) { |
| 6540 | case IORING_OP_READV: |
| 6541 | case IORING_OP_READ_FIXED: |
| 6542 | case IORING_OP_READ: |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 6543 | kfree((void *)(unsigned long)req->rw.addr); |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6544 | break; |
| 6545 | case IORING_OP_RECVMSG: |
| 6546 | case IORING_OP_RECV: |
Jens Axboe | 52de1fe | 2020-02-27 10:15:42 -0700 | [diff] [blame] | 6547 | kfree(req->sr_msg.kbuf); |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6548 | break; |
| 6549 | } |
Pavel Begunkov | 99bc4c3 | 2020-02-07 22:04:45 +0300 | [diff] [blame] | 6550 | } |
| 6551 | |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6552 | if (req->flags & REQ_F_NEED_CLEANUP) { |
| 6553 | switch (req->opcode) { |
| 6554 | case IORING_OP_READV: |
| 6555 | case IORING_OP_READ_FIXED: |
| 6556 | case IORING_OP_READ: |
| 6557 | case IORING_OP_WRITEV: |
| 6558 | case IORING_OP_WRITE_FIXED: |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 6559 | case IORING_OP_WRITE: { |
| 6560 | struct io_async_rw *io = req->async_data; |
Pavel Begunkov | 1dacb4d | 2021-06-17 18:14:03 +0100 | [diff] [blame] | 6561 | |
| 6562 | kfree(io->free_iovec); |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6563 | break; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 6564 | } |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6565 | case IORING_OP_RECVMSG: |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 6566 | case IORING_OP_SENDMSG: { |
| 6567 | struct io_async_msghdr *io = req->async_data; |
Pavel Begunkov | 257e84a | 2021-02-05 00:58:00 +0000 | [diff] [blame] | 6568 | |
| 6569 | kfree(io->free_iov); |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6570 | break; |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 6571 | } |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6572 | case IORING_OP_SPLICE: |
| 6573 | case IORING_OP_TEE: |
Pavel Begunkov | e1d767f | 2021-03-19 17:22:43 +0000 | [diff] [blame] | 6574 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
| 6575 | io_put_file(req->splice.file_in); |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6576 | break; |
Jens Axboe | f3cd4850 | 2020-09-24 14:55:54 -0600 | [diff] [blame] | 6577 | case IORING_OP_OPENAT: |
| 6578 | case IORING_OP_OPENAT2: |
| 6579 | if (req->open.filename) |
| 6580 | putname(req->open.filename); |
| 6581 | break; |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 6582 | case IORING_OP_RENAMEAT: |
| 6583 | putname(req->rename.oldpath); |
| 6584 | putname(req->rename.newpath); |
| 6585 | break; |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 6586 | case IORING_OP_UNLINKAT: |
| 6587 | putname(req->unlink.filename); |
| 6588 | break; |
Dmitry Kadashev | e34a02d | 2021-07-08 13:34:45 +0700 | [diff] [blame] | 6589 | case IORING_OP_MKDIRAT: |
| 6590 | putname(req->mkdir.filename); |
| 6591 | break; |
Dmitry Kadashev | 7a8721f | 2021-07-08 13:34:46 +0700 | [diff] [blame] | 6592 | case IORING_OP_SYMLINKAT: |
| 6593 | putname(req->symlink.oldpath); |
| 6594 | putname(req->symlink.newpath); |
| 6595 | break; |
Dmitry Kadashev | cf30da9 | 2021-07-08 13:34:47 +0700 | [diff] [blame] | 6596 | case IORING_OP_LINKAT: |
| 6597 | putname(req->hardlink.oldpath); |
| 6598 | putname(req->hardlink.newpath); |
| 6599 | break; |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6600 | } |
Pavel Begunkov | 0e1b6fe3 | 2020-07-16 23:28:02 +0300 | [diff] [blame] | 6601 | } |
Jens Axboe | 75652a30 | 2021-04-15 09:52:40 -0600 | [diff] [blame] | 6602 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
| 6603 | kfree(req->apoll->double_poll); |
| 6604 | kfree(req->apoll); |
| 6605 | req->apoll = NULL; |
| 6606 | } |
Pavel Begunkov | 3a0a690 | 2021-04-20 12:03:31 +0100 | [diff] [blame] | 6607 | if (req->flags & REQ_F_INFLIGHT) { |
| 6608 | struct io_uring_task *tctx = req->task->io_uring; |
| 6609 | |
| 6610 | atomic_dec(&tctx->inflight_tracked); |
Pavel Begunkov | 3a0a690 | 2021-04-20 12:03:31 +0100 | [diff] [blame] | 6611 | } |
Pavel Begunkov | c854357 | 2021-06-17 18:14:04 +0100 | [diff] [blame] | 6612 | if (req->flags & REQ_F_CREDS) |
Pavel Begunkov | b8e64b5 | 2021-06-17 18:14:02 +0100 | [diff] [blame] | 6613 | put_cred(req->creds); |
Pavel Begunkov | c854357 | 2021-06-17 18:14:04 +0100 | [diff] [blame] | 6614 | |
| 6615 | req->flags &= ~IO_REQ_CLEAN_FLAGS; |
Pavel Begunkov | 99bc4c3 | 2020-02-07 22:04:45 +0300 | [diff] [blame] | 6616 | } |
| 6617 | |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6618 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 6619 | { |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 6620 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 5730b27 | 2021-02-27 15:57:30 -0700 | [diff] [blame] | 6621 | const struct cred *creds = NULL; |
Jens Axboe | d625c6e | 2019-12-17 19:53:05 -0700 | [diff] [blame] | 6622 | int ret; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 6623 | |
Pavel Begunkov | b8e64b5 | 2021-06-17 18:14:02 +0100 | [diff] [blame] | 6624 | if ((req->flags & REQ_F_CREDS) && req->creds != current_cred()) |
Pavel Begunkov | c10d1f9 | 2021-06-17 18:14:01 +0100 | [diff] [blame] | 6625 | creds = override_creds(req->creds); |
Jens Axboe | 5730b27 | 2021-02-27 15:57:30 -0700 | [diff] [blame] | 6626 | |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 6627 | if (!io_op_defs[req->opcode].audit_skip) |
| 6628 | audit_uring_entry(req->opcode); |
| 6629 | |
Jens Axboe | d625c6e | 2019-12-17 19:53:05 -0700 | [diff] [blame] | 6630 | switch (req->opcode) { |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6631 | case IORING_OP_NOP: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6632 | ret = io_nop(req, issue_flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6633 | break; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6634 | case IORING_OP_READV: |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 6635 | case IORING_OP_READ_FIXED: |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 6636 | case IORING_OP_READ: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6637 | ret = io_read(req, issue_flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6638 | break; |
| 6639 | case IORING_OP_WRITEV: |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6640 | case IORING_OP_WRITE_FIXED: |
Jens Axboe | 3a6820f | 2019-12-22 15:19:35 -0700 | [diff] [blame] | 6641 | case IORING_OP_WRITE: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6642 | ret = io_write(req, issue_flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6643 | break; |
| 6644 | case IORING_OP_FSYNC: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6645 | ret = io_fsync(req, issue_flags); |
Jackie Liu | ba5290c | 2019-10-09 09:19:59 +0800 | [diff] [blame] | 6646 | break; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6647 | case IORING_OP_POLL_ADD: |
Pavel Begunkov | 61e9820 | 2021-02-10 00:03:08 +0000 | [diff] [blame] | 6648 | ret = io_poll_add(req, issue_flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6649 | break; |
| 6650 | case IORING_OP_POLL_REMOVE: |
Pavel Begunkov | c5de003 | 2021-04-14 13:38:37 +0100 | [diff] [blame] | 6651 | ret = io_poll_update(req, issue_flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6652 | break; |
Jens Axboe | b76da70 | 2019-11-20 13:05:32 -0700 | [diff] [blame] | 6653 | case IORING_OP_SYNC_FILE_RANGE: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6654 | ret = io_sync_file_range(req, issue_flags); |
Jens Axboe | b76da70 | 2019-11-20 13:05:32 -0700 | [diff] [blame] | 6655 | break; |
| 6656 | case IORING_OP_SENDMSG: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6657 | ret = io_sendmsg(req, issue_flags); |
Pavel Begunkov | 062d04d | 2020-10-10 18:34:12 +0100 | [diff] [blame] | 6658 | break; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 6659 | case IORING_OP_SEND: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6660 | ret = io_send(req, issue_flags); |
Jens Axboe | b76da70 | 2019-11-20 13:05:32 -0700 | [diff] [blame] | 6661 | break; |
| 6662 | case IORING_OP_RECVMSG: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6663 | ret = io_recvmsg(req, issue_flags); |
Pavel Begunkov | 062d04d | 2020-10-10 18:34:12 +0100 | [diff] [blame] | 6664 | break; |
Jens Axboe | fddafac | 2020-01-04 20:19:44 -0700 | [diff] [blame] | 6665 | case IORING_OP_RECV: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6666 | ret = io_recv(req, issue_flags); |
Jens Axboe | b76da70 | 2019-11-20 13:05:32 -0700 | [diff] [blame] | 6667 | break; |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 6668 | case IORING_OP_TIMEOUT: |
Pavel Begunkov | 61e9820 | 2021-02-10 00:03:08 +0000 | [diff] [blame] | 6669 | ret = io_timeout(req, issue_flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6670 | break; |
| 6671 | case IORING_OP_TIMEOUT_REMOVE: |
Pavel Begunkov | 61e9820 | 2021-02-10 00:03:08 +0000 | [diff] [blame] | 6672 | ret = io_timeout_remove(req, issue_flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6673 | break; |
| 6674 | case IORING_OP_ACCEPT: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6675 | ret = io_accept(req, issue_flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6676 | break; |
| 6677 | case IORING_OP_CONNECT: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6678 | ret = io_connect(req, issue_flags); |
Jens Axboe | 31b5151 | 2019-01-18 22:56:34 -0700 | [diff] [blame] | 6679 | break; |
| 6680 | case IORING_OP_ASYNC_CANCEL: |
Pavel Begunkov | 61e9820 | 2021-02-10 00:03:08 +0000 | [diff] [blame] | 6681 | ret = io_async_cancel(req, issue_flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6682 | break; |
Jens Axboe | d63d1b5 | 2019-12-10 10:38:56 -0700 | [diff] [blame] | 6683 | case IORING_OP_FALLOCATE: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6684 | ret = io_fallocate(req, issue_flags); |
Jens Axboe | d63d1b5 | 2019-12-10 10:38:56 -0700 | [diff] [blame] | 6685 | break; |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 6686 | case IORING_OP_OPENAT: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6687 | ret = io_openat(req, issue_flags); |
Jens Axboe | 15b71ab | 2019-12-11 11:20:36 -0700 | [diff] [blame] | 6688 | break; |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 6689 | case IORING_OP_CLOSE: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6690 | ret = io_close(req, issue_flags); |
Jens Axboe | b5dba59 | 2019-12-11 14:02:38 -0700 | [diff] [blame] | 6691 | break; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6692 | case IORING_OP_FILES_UPDATE: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6693 | ret = io_files_update(req, issue_flags); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 6694 | break; |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 6695 | case IORING_OP_STATX: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6696 | ret = io_statx(req, issue_flags); |
Jens Axboe | eddc7ef | 2019-12-13 21:18:10 -0700 | [diff] [blame] | 6697 | break; |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 6698 | case IORING_OP_FADVISE: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6699 | ret = io_fadvise(req, issue_flags); |
Jens Axboe | 4840e41 | 2019-12-25 22:03:45 -0700 | [diff] [blame] | 6700 | break; |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 6701 | case IORING_OP_MADVISE: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6702 | ret = io_madvise(req, issue_flags); |
Jens Axboe | c1ca757 | 2019-12-25 22:18:28 -0700 | [diff] [blame] | 6703 | break; |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 6704 | case IORING_OP_OPENAT2: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6705 | ret = io_openat2(req, issue_flags); |
Jens Axboe | cebdb98 | 2020-01-08 17:59:24 -0700 | [diff] [blame] | 6706 | break; |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 6707 | case IORING_OP_EPOLL_CTL: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6708 | ret = io_epoll_ctl(req, issue_flags); |
Jens Axboe | 3e4827b | 2020-01-08 15:18:09 -0700 | [diff] [blame] | 6709 | break; |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 6710 | case IORING_OP_SPLICE: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6711 | ret = io_splice(req, issue_flags); |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 6712 | break; |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 6713 | case IORING_OP_PROVIDE_BUFFERS: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6714 | ret = io_provide_buffers(req, issue_flags); |
Jens Axboe | ddf0322d | 2020-02-23 16:41:33 -0700 | [diff] [blame] | 6715 | break; |
Jens Axboe | 067524e | 2020-03-02 16:32:28 -0700 | [diff] [blame] | 6716 | case IORING_OP_REMOVE_BUFFERS: |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6717 | ret = io_remove_buffers(req, issue_flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6718 | break; |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 6719 | case IORING_OP_TEE: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6720 | ret = io_tee(req, issue_flags); |
Pavel Begunkov | f2a8d5c | 2020-05-17 14:18:06 +0300 | [diff] [blame] | 6721 | break; |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 6722 | case IORING_OP_SHUTDOWN: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6723 | ret = io_shutdown(req, issue_flags); |
Jens Axboe | 36f4fa6 | 2020-09-05 11:14:22 -0600 | [diff] [blame] | 6724 | break; |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 6725 | case IORING_OP_RENAMEAT: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6726 | ret = io_renameat(req, issue_flags); |
Jens Axboe | 80a261f | 2020-09-28 14:23:58 -0600 | [diff] [blame] | 6727 | break; |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 6728 | case IORING_OP_UNLINKAT: |
Pavel Begunkov | 45d189c | 2021-02-10 00:03:07 +0000 | [diff] [blame] | 6729 | ret = io_unlinkat(req, issue_flags); |
Jens Axboe | 14a1143 | 2020-09-28 14:27:37 -0600 | [diff] [blame] | 6730 | break; |
Dmitry Kadashev | e34a02d | 2021-07-08 13:34:45 +0700 | [diff] [blame] | 6731 | case IORING_OP_MKDIRAT: |
| 6732 | ret = io_mkdirat(req, issue_flags); |
| 6733 | break; |
Dmitry Kadashev | 7a8721f | 2021-07-08 13:34:46 +0700 | [diff] [blame] | 6734 | case IORING_OP_SYMLINKAT: |
| 6735 | ret = io_symlinkat(req, issue_flags); |
| 6736 | break; |
Dmitry Kadashev | cf30da9 | 2021-07-08 13:34:47 +0700 | [diff] [blame] | 6737 | case IORING_OP_LINKAT: |
| 6738 | ret = io_linkat(req, issue_flags); |
| 6739 | break; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6740 | default: |
| 6741 | ret = -EINVAL; |
| 6742 | break; |
| 6743 | } |
Jens Axboe | 31b5151 | 2019-01-18 22:56:34 -0700 | [diff] [blame] | 6744 | |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 6745 | if (!io_op_defs[req->opcode].audit_skip) |
| 6746 | audit_uring_exit(!ret, ret); |
| 6747 | |
Jens Axboe | 5730b27 | 2021-02-27 15:57:30 -0700 | [diff] [blame] | 6748 | if (creds) |
| 6749 | revert_creds(creds); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6750 | if (ret) |
| 6751 | return ret; |
Jens Axboe | b532576 | 2020-05-19 21:20:27 -0600 | [diff] [blame] | 6752 | /* If the op doesn't have a file, we're not polling for it */ |
Pavel Begunkov | cb3d897 | 2021-06-14 02:36:14 +0100 | [diff] [blame] | 6753 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
| 6754 | io_iopoll_req_issued(req); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6755 | |
| 6756 | return 0; |
| 6757 | } |
| 6758 | |
Pavel Begunkov | ebc11b6 | 2021-08-09 13:04:05 +0100 | [diff] [blame] | 6759 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
| 6760 | { |
| 6761 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
| 6762 | |
| 6763 | req = io_put_req_find_next(req); |
| 6764 | return req ? &req->work : NULL; |
| 6765 | } |
| 6766 | |
Pavel Begunkov | 5280f7e | 2021-02-04 13:52:08 +0000 | [diff] [blame] | 6767 | static void io_wq_submit_work(struct io_wq_work *work) |
Pavel Begunkov | d4c81f3 | 2020-06-08 21:08:19 +0300 | [diff] [blame] | 6768 | { |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6769 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
Pavel Begunkov | 6df1db6 | 2020-07-03 22:15:06 +0300 | [diff] [blame] | 6770 | struct io_kiocb *timeout; |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 6771 | int ret = 0; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6772 | |
Pavel Begunkov | 48dcd38 | 2021-08-15 10:40:18 +0100 | [diff] [blame] | 6773 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
| 6774 | if (!(req->flags & REQ_F_REFCOUNT)) |
| 6775 | __io_req_set_refcount(req, 2); |
| 6776 | else |
| 6777 | req_ref_get(req); |
Pavel Begunkov | 5d5901a | 2021-08-11 19:28:29 +0100 | [diff] [blame] | 6778 | |
Pavel Begunkov | 6df1db6 | 2020-07-03 22:15:06 +0300 | [diff] [blame] | 6779 | timeout = io_prep_linked_timeout(req); |
| 6780 | if (timeout) |
| 6781 | io_queue_linked_timeout(timeout); |
Pavel Begunkov | d4c81f3 | 2020-06-08 21:08:19 +0300 | [diff] [blame] | 6782 | |
Pavel Begunkov | dadebc3 | 2021-08-23 13:30:44 +0100 | [diff] [blame] | 6783 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
Jens Axboe | 4014d94 | 2021-01-19 15:53:54 -0700 | [diff] [blame] | 6784 | if (work->flags & IO_WQ_WORK_CANCEL) |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 6785 | ret = -ECANCELED; |
Jens Axboe | 31b5151 | 2019-01-18 22:56:34 -0700 | [diff] [blame] | 6786 | |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 6787 | if (!ret) { |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 6788 | do { |
Pavel Begunkov | 889fca7 | 2021-02-10 00:03:09 +0000 | [diff] [blame] | 6789 | ret = io_issue_sqe(req, 0); |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 6790 | /* |
| 6791 | * We can get EAGAIN for polled IO even though we're |
| 6792 | * forcing a sync submission from here, since we can't |
| 6793 | * wait for request slots on the block side. |
| 6794 | */ |
| 6795 | if (ret != -EAGAIN) |
| 6796 | break; |
| 6797 | cond_resched(); |
| 6798 | } while (1); |
| 6799 | } |
Jens Axboe | 31b5151 | 2019-01-18 22:56:34 -0700 | [diff] [blame] | 6800 | |
Pavel Begunkov | a3df7698 | 2021-02-18 22:32:52 +0000 | [diff] [blame] | 6801 | /* avoid locking problems by failing it from a clean context */ |
Pavel Begunkov | 5d5901a | 2021-08-11 19:28:29 +0100 | [diff] [blame] | 6802 | if (ret) |
Pavel Begunkov | a3df7698 | 2021-02-18 22:32:52 +0000 | [diff] [blame] | 6803 | io_req_task_queue_fail(req, ret); |
Jens Axboe | 31b5151 | 2019-01-18 22:56:34 -0700 | [diff] [blame] | 6804 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6805 | |
Pavel Begunkov | aeca241 | 2021-04-11 01:46:37 +0100 | [diff] [blame] | 6806 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
Pavel Begunkov | 042b0d8 | 2021-08-09 13:04:01 +0100 | [diff] [blame] | 6807 | unsigned i) |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 6808 | { |
Pavel Begunkov | 042b0d8 | 2021-08-09 13:04:01 +0100 | [diff] [blame] | 6809 | return &table->files[i]; |
Pavel Begunkov | dafecf1 | 2021-02-28 22:35:11 +0000 | [diff] [blame] | 6810 | } |
| 6811 | |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 6812 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
| 6813 | int index) |
| 6814 | { |
Pavel Begunkov | aeca241 | 2021-04-11 01:46:37 +0100 | [diff] [blame] | 6815 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
Jens Axboe | 65e19f5 | 2019-10-26 07:20:21 -0600 | [diff] [blame] | 6816 | |
Pavel Begunkov | a04b0ac | 2021-04-01 15:44:04 +0100 | [diff] [blame] | 6817 | return (struct file *) (slot->file_ptr & FFS_MASK); |
Jens Axboe | 65e19f5 | 2019-10-26 07:20:21 -0600 | [diff] [blame] | 6818 | } |
| 6819 | |
Pavel Begunkov | a04b0ac | 2021-04-01 15:44:04 +0100 | [diff] [blame] | 6820 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
Pavel Begunkov | 9a321c9 | 2021-04-01 15:44:01 +0100 | [diff] [blame] | 6821 | { |
| 6822 | unsigned long file_ptr = (unsigned long) file; |
| 6823 | |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 6824 | if (__io_file_supports_nowait(file, READ)) |
Pavel Begunkov | 9a321c9 | 2021-04-01 15:44:01 +0100 | [diff] [blame] | 6825 | file_ptr |= FFS_ASYNC_READ; |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 6826 | if (__io_file_supports_nowait(file, WRITE)) |
Pavel Begunkov | 9a321c9 | 2021-04-01 15:44:01 +0100 | [diff] [blame] | 6827 | file_ptr |= FFS_ASYNC_WRITE; |
| 6828 | if (S_ISREG(file_inode(file)->i_mode)) |
| 6829 | file_ptr |= FFS_ISREG; |
Pavel Begunkov | a04b0ac | 2021-04-01 15:44:04 +0100 | [diff] [blame] | 6830 | file_slot->file_ptr = file_ptr; |
Jens Axboe | 09bb839 | 2019-03-13 12:39:28 -0600 | [diff] [blame] | 6831 | } |
| 6832 | |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 6833 | static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, |
| 6834 | struct io_kiocb *req, int fd) |
Pavel Begunkov | 8da11c1 | 2020-02-24 11:32:44 +0300 | [diff] [blame] | 6835 | { |
Pavel Begunkov | 8da11c1 | 2020-02-24 11:32:44 +0300 | [diff] [blame] | 6836 | struct file *file; |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 6837 | unsigned long file_ptr; |
Pavel Begunkov | 8da11c1 | 2020-02-24 11:32:44 +0300 | [diff] [blame] | 6838 | |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 6839 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
| 6840 | return NULL; |
| 6841 | fd = array_index_nospec(fd, ctx->nr_user_files); |
| 6842 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; |
| 6843 | file = (struct file *) (file_ptr & FFS_MASK); |
| 6844 | file_ptr &= ~FFS_MASK; |
| 6845 | /* mask in overlapping REQ_F and FFS bits */ |
Pavel Begunkov | b191e2d | 2021-08-09 13:04:03 +0100 | [diff] [blame] | 6846 | req->flags |= (file_ptr << REQ_F_NOWAIT_READ_BIT); |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 6847 | io_req_set_rsrc_node(req); |
Pavel Begunkov | 8371adf | 2020-10-10 18:34:08 +0100 | [diff] [blame] | 6848 | return file; |
Pavel Begunkov | 8da11c1 | 2020-02-24 11:32:44 +0300 | [diff] [blame] | 6849 | } |
| 6850 | |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 6851 | static struct file *io_file_get_normal(struct io_ring_ctx *ctx, |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 6852 | struct io_kiocb *req, int fd) |
| 6853 | { |
Pavel Begunkov | 62906e8 | 2021-08-10 14:52:47 +0100 | [diff] [blame] | 6854 | struct file *file = fget(fd); |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 6855 | |
| 6856 | trace_io_uring_file_get(ctx, fd); |
| 6857 | |
| 6858 | /* we don't allow fixed io_uring files */ |
| 6859 | if (file && unlikely(file->f_op == &io_uring_fops)) |
| 6860 | io_req_track_inflight(req); |
| 6861 | return file; |
| 6862 | } |
| 6863 | |
| 6864 | static inline struct file *io_file_get(struct io_ring_ctx *ctx, |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 6865 | struct io_kiocb *req, int fd, bool fixed) |
| 6866 | { |
| 6867 | if (fixed) |
| 6868 | return io_file_get_fixed(ctx, req, fd); |
| 6869 | else |
Pavel Begunkov | 62906e8 | 2021-08-10 14:52:47 +0100 | [diff] [blame] | 6870 | return io_file_get_normal(ctx, req, fd); |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 6871 | } |
| 6872 | |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 6873 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 6874 | { |
| 6875 | struct io_kiocb *prev = req->timeout.prev; |
Pavel Begunkov | 8cb01fa | 2021-08-15 10:40:22 +0100 | [diff] [blame] | 6876 | int ret; |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 6877 | |
| 6878 | if (prev) { |
Pavel Begunkov | 8cb01fa | 2021-08-15 10:40:22 +0100 | [diff] [blame] | 6879 | ret = io_try_cancel_userdata(req, prev->user_data); |
Pavel Begunkov | 505657b | 2021-08-17 20:28:09 +0100 | [diff] [blame] | 6880 | io_req_complete_post(req, ret ?: -ETIME, 0); |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 6881 | io_put_req(prev); |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 6882 | } else { |
| 6883 | io_req_complete_post(req, -ETIME, 0); |
| 6884 | } |
| 6885 | } |
| 6886 | |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6887 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
| 6888 | { |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6889 | struct io_timeout_data *data = container_of(timer, |
| 6890 | struct io_timeout_data, timer); |
Pavel Begunkov | 90cd7e4 | 2020-10-27 23:25:36 +0000 | [diff] [blame] | 6891 | struct io_kiocb *prev, *req = data->req; |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6892 | struct io_ring_ctx *ctx = req->ctx; |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6893 | unsigned long flags; |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6894 | |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 6895 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
Pavel Begunkov | 90cd7e4 | 2020-10-27 23:25:36 +0000 | [diff] [blame] | 6896 | prev = req->timeout.head; |
| 6897 | req->timeout.head = NULL; |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6898 | |
| 6899 | /* |
| 6900 | * We don't expect the list to be empty, that will only happen if we |
| 6901 | * race with the completion of the linked work. |
| 6902 | */ |
Pavel Begunkov | 447c19f | 2021-05-14 12:02:50 +0100 | [diff] [blame] | 6903 | if (prev) { |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 6904 | io_remove_next_linked(prev); |
Pavel Begunkov | 447c19f | 2021-05-14 12:02:50 +0100 | [diff] [blame] | 6905 | if (!req_ref_inc_not_zero(prev)) |
| 6906 | prev = NULL; |
| 6907 | } |
Pavel Begunkov | ef9dd63 | 2021-08-28 19:54:38 -0600 | [diff] [blame] | 6908 | list_del(&req->timeout.list); |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 6909 | req->timeout.prev = prev; |
| 6910 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6911 | |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 6912 | req->io_task_work.func = io_req_task_link_timeout; |
| 6913 | io_req_task_work_add(req); |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6914 | return HRTIMER_NORESTART; |
| 6915 | } |
| 6916 | |
Pavel Begunkov | de968c1 | 2021-03-19 17:22:33 +0000 | [diff] [blame] | 6917 | static void io_queue_linked_timeout(struct io_kiocb *req) |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6918 | { |
Pavel Begunkov | de968c1 | 2021-03-19 17:22:33 +0000 | [diff] [blame] | 6919 | struct io_ring_ctx *ctx = req->ctx; |
| 6920 | |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 6921 | spin_lock_irq(&ctx->timeout_lock); |
Jens Axboe | 76a46e0 | 2019-11-10 23:34:16 -0700 | [diff] [blame] | 6922 | /* |
Pavel Begunkov | f2f8737 | 2020-10-27 23:25:37 +0000 | [diff] [blame] | 6923 | * If the back reference is NULL, then our linked request finished |
| 6924 | * before we got a chance to setup the timer |
Jens Axboe | 76a46e0 | 2019-11-10 23:34:16 -0700 | [diff] [blame] | 6925 | */ |
Pavel Begunkov | 90cd7e4 | 2020-10-27 23:25:36 +0000 | [diff] [blame] | 6926 | if (req->timeout.head) { |
Jens Axboe | e8c2bc1 | 2020-08-15 18:44:09 -0700 | [diff] [blame] | 6927 | struct io_timeout_data *data = req->async_data; |
Jens Axboe | 94ae5e7 | 2019-11-14 19:39:52 -0700 | [diff] [blame] | 6928 | |
Jens Axboe | ad8a48a | 2019-11-15 08:49:11 -0700 | [diff] [blame] | 6929 | data->timer.function = io_link_timeout_fn; |
| 6930 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), |
| 6931 | data->mode); |
Pavel Begunkov | ef9dd63 | 2021-08-28 19:54:38 -0600 | [diff] [blame] | 6932 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6933 | } |
Jens Axboe | 89b263f | 2021-08-10 15:14:18 -0600 | [diff] [blame] | 6934 | spin_unlock_irq(&ctx->timeout_lock); |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6935 | /* drop submission reference */ |
Jens Axboe | 76a46e0 | 2019-11-10 23:34:16 -0700 | [diff] [blame] | 6936 | io_put_req(req); |
Jens Axboe | 2665abf | 2019-11-05 12:40:47 -0700 | [diff] [blame] | 6937 | } |
| 6938 | |
Pavel Begunkov | c5eef2b94 | 2021-02-10 00:03:22 +0000 | [diff] [blame] | 6939 | static void __io_queue_sqe(struct io_kiocb *req) |
Pavel Begunkov | 282cdc8 | 2021-08-09 13:04:10 +0100 | [diff] [blame] | 6940 | __must_hold(&req->ctx->uring_lock) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6941 | { |
Pavel Begunkov | 906c6ca | 2021-08-15 10:40:26 +0100 | [diff] [blame] | 6942 | struct io_kiocb *linked_timeout; |
Jens Axboe | e0c5c57 | 2019-03-12 10:18:47 -0600 | [diff] [blame] | 6943 | int ret; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6944 | |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 6945 | issue_sqe: |
Pavel Begunkov | c5eef2b94 | 2021-02-10 00:03:22 +0000 | [diff] [blame] | 6946 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
Jens Axboe | 491381ce | 2019-10-17 09:20:46 -0600 | [diff] [blame] | 6947 | |
| 6948 | /* |
| 6949 | * We async punt it if the file wasn't marked NOWAIT, or if the file |
| 6950 | * doesn't support non-blocking read/write attempts |
| 6951 | */ |
Pavel Begunkov | 1840038 | 2021-03-19 17:22:34 +0000 | [diff] [blame] | 6952 | if (likely(!ret)) { |
Pavel Begunkov | e342c80 | 2021-01-19 13:32:47 +0000 | [diff] [blame] | 6953 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
Pavel Begunkov | c5eef2b94 | 2021-02-10 00:03:22 +0000 | [diff] [blame] | 6954 | struct io_ring_ctx *ctx = req->ctx; |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 6955 | struct io_submit_state *state = &ctx->submit_state; |
Jens Axboe | e65ef56 | 2019-03-12 10:16:44 -0600 | [diff] [blame] | 6956 | |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 6957 | state->compl_reqs[state->compl_nr++] = req; |
| 6958 | if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) |
Pavel Begunkov | 2a2758f | 2021-06-17 18:14:00 +0100 | [diff] [blame] | 6959 | io_submit_flush_completions(ctx); |
Pavel Begunkov | 906c6ca | 2021-08-15 10:40:26 +0100 | [diff] [blame] | 6960 | return; |
Pavel Begunkov | 0d63c14 | 2020-10-22 16:47:18 +0100 | [diff] [blame] | 6961 | } |
Pavel Begunkov | 906c6ca | 2021-08-15 10:40:26 +0100 | [diff] [blame] | 6962 | |
| 6963 | linked_timeout = io_prep_linked_timeout(req); |
| 6964 | if (linked_timeout) |
| 6965 | io_queue_linked_timeout(linked_timeout); |
Pavel Begunkov | 1840038 | 2021-03-19 17:22:34 +0000 | [diff] [blame] | 6966 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
Pavel Begunkov | 906c6ca | 2021-08-15 10:40:26 +0100 | [diff] [blame] | 6967 | linked_timeout = io_prep_linked_timeout(req); |
| 6968 | |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 6969 | switch (io_arm_poll_handler(req)) { |
| 6970 | case IO_APOLL_READY: |
Pavel Begunkov | 906c6ca | 2021-08-15 10:40:26 +0100 | [diff] [blame] | 6971 | if (linked_timeout) |
| 6972 | io_unprep_linked_timeout(req); |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 6973 | goto issue_sqe; |
| 6974 | case IO_APOLL_ABORTED: |
Pavel Begunkov | 1840038 | 2021-03-19 17:22:34 +0000 | [diff] [blame] | 6975 | /* |
| 6976 | * Queued up for async execution, worker will release |
| 6977 | * submit reference when the iocb is actually submitted. |
| 6978 | */ |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 6979 | io_queue_async_work(req, NULL); |
Olivier Langlois | 59b735a | 2021-06-22 05:17:39 -0700 | [diff] [blame] | 6980 | break; |
Pavel Begunkov | 1840038 | 2021-03-19 17:22:34 +0000 | [diff] [blame] | 6981 | } |
Pavel Begunkov | 906c6ca | 2021-08-15 10:40:26 +0100 | [diff] [blame] | 6982 | |
| 6983 | if (linked_timeout) |
| 6984 | io_queue_linked_timeout(linked_timeout); |
Pavel Begunkov | 0d63c14 | 2020-10-22 16:47:18 +0100 | [diff] [blame] | 6985 | } else { |
Pavel Begunkov | f41db273 | 2021-02-28 22:35:12 +0000 | [diff] [blame] | 6986 | io_req_complete_failed(req, ret); |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 6987 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 6988 | } |
| 6989 | |
Pavel Begunkov | 441b8a7 | 2021-06-14 23:37:31 +0100 | [diff] [blame] | 6990 | static inline void io_queue_sqe(struct io_kiocb *req) |
Pavel Begunkov | 282cdc8 | 2021-08-09 13:04:10 +0100 | [diff] [blame] | 6991 | __must_hold(&req->ctx->uring_lock) |
Jackie Liu | 4fe2c96 | 2019-09-09 20:50:40 +0800 | [diff] [blame] | 6992 | { |
Pavel Begunkov | 10c6690 | 2021-06-15 16:47:56 +0100 | [diff] [blame] | 6993 | if (unlikely(req->ctx->drain_active) && io_drain_req(req)) |
Pavel Begunkov | 76cc33d | 2021-06-14 23:37:30 +0100 | [diff] [blame] | 6994 | return; |
Jackie Liu | 4fe2c96 | 2019-09-09 20:50:40 +0800 | [diff] [blame] | 6995 | |
Hao Xu | a8295b9 | 2021-08-27 17:46:09 +0800 | [diff] [blame] | 6996 | if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) { |
Pavel Begunkov | c5eef2b94 | 2021-02-10 00:03:22 +0000 | [diff] [blame] | 6997 | __io_queue_sqe(req); |
Hao Xu | a8295b9 | 2021-08-27 17:46:09 +0800 | [diff] [blame] | 6998 | } else if (req->flags & REQ_F_FAIL) { |
Pavel Begunkov | c6d3d9c | 2021-08-31 14:13:10 +0100 | [diff] [blame] | 6999 | io_req_complete_fail_submit(req); |
Pavel Begunkov | 76cc33d | 2021-06-14 23:37:30 +0100 | [diff] [blame] | 7000 | } else { |
| 7001 | int ret = io_req_prep_async(req); |
| 7002 | |
| 7003 | if (unlikely(ret)) |
| 7004 | io_req_complete_failed(req, ret); |
| 7005 | else |
Pavel Begunkov | f237c30 | 2021-08-18 12:42:46 +0100 | [diff] [blame] | 7006 | io_queue_async_work(req, NULL); |
Jens Axboe | ce35a47 | 2019-12-17 08:04:44 -0700 | [diff] [blame] | 7007 | } |
Jackie Liu | 4fe2c96 | 2019-09-09 20:50:40 +0800 | [diff] [blame] | 7008 | } |
| 7009 | |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 7010 | /* |
| 7011 | * Check SQE restrictions (opcode and flags). |
| 7012 | * |
| 7013 | * Returns 'true' if SQE is allowed, 'false' otherwise. |
| 7014 | */ |
| 7015 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, |
| 7016 | struct io_kiocb *req, |
| 7017 | unsigned int sqe_flags) |
| 7018 | { |
Pavel Begunkov | 4cfb25b | 2021-06-26 21:40:47 +0100 | [diff] [blame] | 7019 | if (likely(!ctx->restricted)) |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 7020 | return true; |
| 7021 | |
| 7022 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) |
| 7023 | return false; |
| 7024 | |
| 7025 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != |
| 7026 | ctx->restrictions.sqe_flags_required) |
| 7027 | return false; |
| 7028 | |
| 7029 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | |
| 7030 | ctx->restrictions.sqe_flags_required)) |
| 7031 | return false; |
| 7032 | |
| 7033 | return true; |
| 7034 | } |
| 7035 | |
Pavel Begunkov | ef4ff58 | 2020-04-12 02:05:05 +0300 | [diff] [blame] | 7036 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 7037 | const struct io_uring_sqe *sqe) |
Pavel Begunkov | 282cdc8 | 2021-08-09 13:04:10 +0100 | [diff] [blame] | 7038 | __must_hold(&ctx->uring_lock) |
Pavel Begunkov | 0553b8b | 2020-04-08 08:58:45 +0300 | [diff] [blame] | 7039 | { |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 7040 | struct io_submit_state *state; |
Pavel Begunkov | ef4ff58 | 2020-04-12 02:05:05 +0300 | [diff] [blame] | 7041 | unsigned int sqe_flags; |
Jens Axboe | 003e8dc | 2021-03-06 09:22:27 -0700 | [diff] [blame] | 7042 | int personality, ret = 0; |
Pavel Begunkov | ef4ff58 | 2020-04-12 02:05:05 +0300 | [diff] [blame] | 7043 | |
Pavel Begunkov | 864ea92 | 2021-08-09 13:04:08 +0100 | [diff] [blame] | 7044 | /* req is partially pre-initialised, see io_preinit_req() */ |
Pavel Begunkov | 0553b8b | 2020-04-08 08:58:45 +0300 | [diff] [blame] | 7045 | req->opcode = READ_ONCE(sqe->opcode); |
Pavel Begunkov | 5be9ad1 | 2021-02-12 18:41:17 +0000 | [diff] [blame] | 7046 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
| 7047 | req->flags = sqe_flags = READ_ONCE(sqe->flags); |
Pavel Begunkov | 0553b8b | 2020-04-08 08:58:45 +0300 | [diff] [blame] | 7048 | req->user_data = READ_ONCE(sqe->user_data); |
Pavel Begunkov | 0553b8b | 2020-04-08 08:58:45 +0300 | [diff] [blame] | 7049 | req->file = NULL; |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 7050 | req->fixed_rsrc_refs = NULL; |
Pavel Begunkov | 4dd2824 | 2020-06-15 10:33:13 +0300 | [diff] [blame] | 7051 | req->task = current; |
Pavel Begunkov | ef4ff58 | 2020-04-12 02:05:05 +0300 | [diff] [blame] | 7052 | |
Pavel Begunkov | 5be9ad1 | 2021-02-12 18:41:17 +0000 | [diff] [blame] | 7053 | /* enforce forwards compatibility on users */ |
Pavel Begunkov | dddca22 | 2021-04-27 16:13:52 +0100 | [diff] [blame] | 7054 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) |
Pavel Begunkov | 5be9ad1 | 2021-02-12 18:41:17 +0000 | [diff] [blame] | 7055 | return -EINVAL; |
Pavel Begunkov | ef4ff58 | 2020-04-12 02:05:05 +0300 | [diff] [blame] | 7056 | if (unlikely(req->opcode >= IORING_OP_LAST)) |
| 7057 | return -EINVAL; |
Pavel Begunkov | 4cfb25b | 2021-06-26 21:40:47 +0100 | [diff] [blame] | 7058 | if (!io_check_restriction(ctx, req, sqe_flags)) |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 7059 | return -EACCES; |
| 7060 | |
Pavel Begunkov | ef4ff58 | 2020-04-12 02:05:05 +0300 | [diff] [blame] | 7061 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
| 7062 | !io_op_defs[req->opcode].buffer_select) |
| 7063 | return -EOPNOTSUPP; |
Pavel Begunkov | 3c19966 | 2021-06-15 16:47:57 +0100 | [diff] [blame] | 7064 | if (unlikely(sqe_flags & IOSQE_IO_DRAIN)) |
| 7065 | ctx->drain_active = true; |
Pavel Begunkov | ef4ff58 | 2020-04-12 02:05:05 +0300 | [diff] [blame] | 7066 | |
Jens Axboe | 003e8dc | 2021-03-06 09:22:27 -0700 | [diff] [blame] | 7067 | personality = READ_ONCE(sqe->personality); |
| 7068 | if (personality) { |
Pavel Begunkov | c10d1f9 | 2021-06-17 18:14:01 +0100 | [diff] [blame] | 7069 | req->creds = xa_load(&ctx->personalities, personality); |
| 7070 | if (!req->creds) |
Jens Axboe | 003e8dc | 2021-03-06 09:22:27 -0700 | [diff] [blame] | 7071 | return -EINVAL; |
Pavel Begunkov | c10d1f9 | 2021-06-17 18:14:01 +0100 | [diff] [blame] | 7072 | get_cred(req->creds); |
Pavel Begunkov | b8e64b5 | 2021-06-17 18:14:02 +0100 | [diff] [blame] | 7073 | req->flags |= REQ_F_CREDS; |
Jens Axboe | 003e8dc | 2021-03-06 09:22:27 -0700 | [diff] [blame] | 7074 | } |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 7075 | state = &ctx->submit_state; |
Pavel Begunkov | ef4ff58 | 2020-04-12 02:05:05 +0300 | [diff] [blame] | 7076 | |
Jens Axboe | 27926b6 | 2020-10-28 09:33:23 -0600 | [diff] [blame] | 7077 | /* |
| 7078 | * Plug now if we have more than 1 IO left after this, and the target |
| 7079 | * is potentially a read/write to block based storage. |
| 7080 | */ |
| 7081 | if (!state->plug_started && state->ios_left > 1 && |
| 7082 | io_op_defs[req->opcode].plug) { |
| 7083 | blk_start_plug(&state->plug); |
| 7084 | state->plug_started = true; |
| 7085 | } |
Jens Axboe | 63ff822 | 2020-05-07 14:56:15 -0600 | [diff] [blame] | 7086 | |
Pavel Begunkov | bd5bbda | 2020-11-20 15:50:51 +0000 | [diff] [blame] | 7087 | if (io_op_defs[req->opcode].needs_file) { |
Pavel Begunkov | 62906e8 | 2021-08-10 14:52:47 +0100 | [diff] [blame] | 7088 | req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd), |
Pavel Begunkov | ac17705 | 2021-08-09 13:04:02 +0100 | [diff] [blame] | 7089 | (sqe_flags & IOSQE_FIXED_FILE)); |
Pavel Begunkov | ba13e23 | 2021-02-01 18:59:52 +0000 | [diff] [blame] | 7090 | if (unlikely(!req->file)) |
Pavel Begunkov | bd5bbda | 2020-11-20 15:50:51 +0000 | [diff] [blame] | 7091 | ret = -EBADF; |
| 7092 | } |
| 7093 | |
Pavel Begunkov | 71b547c | 2020-10-10 18:34:09 +0100 | [diff] [blame] | 7094 | state->ios_left--; |
| 7095 | return ret; |
Pavel Begunkov | 0553b8b | 2020-04-08 08:58:45 +0300 | [diff] [blame] | 7096 | } |
| 7097 | |
Pavel Begunkov | a6b8cadc | 2021-02-18 18:29:41 +0000 | [diff] [blame] | 7098 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
Pavel Begunkov | a1ab7b3 | 2021-02-18 18:29:42 +0000 | [diff] [blame] | 7099 | const struct io_uring_sqe *sqe) |
Pavel Begunkov | 282cdc8 | 2021-08-09 13:04:10 +0100 | [diff] [blame] | 7100 | __must_hold(&ctx->uring_lock) |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7101 | { |
Pavel Begunkov | a1ab7b3 | 2021-02-18 18:29:42 +0000 | [diff] [blame] | 7102 | struct io_submit_link *link = &ctx->submit_state.link; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7103 | int ret; |
| 7104 | |
Pavel Begunkov | a6b8cadc | 2021-02-18 18:29:41 +0000 | [diff] [blame] | 7105 | ret = io_init_req(ctx, req, sqe); |
| 7106 | if (unlikely(ret)) { |
| 7107 | fail_req: |
Hao Xu | a8295b9 | 2021-08-27 17:46:09 +0800 | [diff] [blame] | 7108 | /* fail even hard links since we don't submit */ |
Pavel Begunkov | de59bc1 | 2021-02-18 18:29:47 +0000 | [diff] [blame] | 7109 | if (link->head) { |
Hao Xu | a8295b9 | 2021-08-27 17:46:09 +0800 | [diff] [blame] | 7110 | /* |
| 7111 | * we can judge a link req is failed or cancelled by if |
| 7112 | * REQ_F_FAIL is set, but the head is an exception since |
| 7113 | * it may be set REQ_F_FAIL because of other req's failure |
| 7114 | * so let's leverage req->result to distinguish if a head |
| 7115 | * is set REQ_F_FAIL because of its failure or other req's |
| 7116 | * failure so that we can set the correct ret code for it. |
| 7117 | * init result here to avoid affecting the normal path. |
| 7118 | */ |
| 7119 | if (!(link->head->flags & REQ_F_FAIL)) |
| 7120 | req_fail_link_node(link->head, -ECANCELED); |
| 7121 | } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
| 7122 | /* |
| 7123 | * the current req is a normal req, we should return |
| 7124 | * error and thus break the submittion loop. |
| 7125 | */ |
| 7126 | io_req_complete_failed(req, ret); |
| 7127 | return ret; |
Pavel Begunkov | de59bc1 | 2021-02-18 18:29:47 +0000 | [diff] [blame] | 7128 | } |
Hao Xu | a8295b9 | 2021-08-27 17:46:09 +0800 | [diff] [blame] | 7129 | req_fail_link_node(req, ret); |
| 7130 | } else { |
| 7131 | ret = io_req_prep(req, sqe); |
| 7132 | if (unlikely(ret)) |
| 7133 | goto fail_req; |
Pavel Begunkov | a6b8cadc | 2021-02-18 18:29:41 +0000 | [diff] [blame] | 7134 | } |
Pavel Begunkov | 441b8a7 | 2021-06-14 23:37:31 +0100 | [diff] [blame] | 7135 | |
Pavel Begunkov | be7053b | 2021-02-18 18:29:45 +0000 | [diff] [blame] | 7136 | /* don't need @sqe from now on */ |
Olivier Langlois | 236daeae | 2021-05-31 02:36:37 -0400 | [diff] [blame] | 7137 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
| 7138 | req->flags, true, |
| 7139 | ctx->flags & IORING_SETUP_SQPOLL); |
Pavel Begunkov | a6b8cadc | 2021-02-18 18:29:41 +0000 | [diff] [blame] | 7140 | |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7141 | /* |
| 7142 | * If we already have a head request, queue this one for async |
| 7143 | * submittal once the head completes. If we don't have a head but |
| 7144 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be |
| 7145 | * submitted sync once the chain is complete. If none of those |
| 7146 | * conditions are true (normal request), then just queue it. |
| 7147 | */ |
| 7148 | if (link->head) { |
| 7149 | struct io_kiocb *head = link->head; |
| 7150 | |
Hao Xu | a8295b9 | 2021-08-27 17:46:09 +0800 | [diff] [blame] | 7151 | if (!(req->flags & REQ_F_FAIL)) { |
| 7152 | ret = io_req_prep_async(req); |
| 7153 | if (unlikely(ret)) { |
| 7154 | req_fail_link_node(req, ret); |
| 7155 | if (!(head->flags & REQ_F_FAIL)) |
| 7156 | req_fail_link_node(head, -ECANCELED); |
| 7157 | } |
| 7158 | } |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7159 | trace_io_uring_link(ctx, req, head); |
| 7160 | link->last->link = req; |
| 7161 | link->last = req; |
| 7162 | |
| 7163 | /* last request of a link, enqueue the link */ |
| 7164 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
| 7165 | link->head = NULL; |
Pavel Begunkov | 5e15920 | 2021-06-14 23:37:26 +0100 | [diff] [blame] | 7166 | io_queue_sqe(head); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 7167 | } |
Jackie Liu | 4fe2c96 | 2019-09-09 20:50:40 +0800 | [diff] [blame] | 7168 | } else { |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 7169 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
Jackie Liu | 4fe2c96 | 2019-09-09 20:50:40 +0800 | [diff] [blame] | 7170 | link->head = req; |
| 7171 | link->last = req; |
| 7172 | } else { |
Pavel Begunkov | be7053b | 2021-02-18 18:29:45 +0000 | [diff] [blame] | 7173 | io_queue_sqe(req); |
Jackie Liu | 4fe2c96 | 2019-09-09 20:50:40 +0800 | [diff] [blame] | 7174 | } |
| 7175 | } |
| 7176 | |
| 7177 | return 0; |
| 7178 | } |
| 7179 | |
| 7180 | /* |
| 7181 | * Batched submission is done, ensure local IO is flushed out. |
| 7182 | */ |
| 7183 | static void io_submit_state_end(struct io_submit_state *state, |
| 7184 | struct io_ring_ctx *ctx) |
Pavel Begunkov | 1b4a51b | 2019-11-21 11:54:28 +0300 | [diff] [blame] | 7185 | { |
Pavel Begunkov | a1ab7b3 | 2021-02-18 18:29:42 +0000 | [diff] [blame] | 7186 | if (state->link.head) |
Pavel Begunkov | de59bc1 | 2021-02-18 18:29:47 +0000 | [diff] [blame] | 7187 | io_queue_sqe(state->link.head); |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 7188 | if (state->compl_nr) |
Pavel Begunkov | 2a2758f | 2021-06-17 18:14:00 +0100 | [diff] [blame] | 7189 | io_submit_flush_completions(ctx); |
Jackie Liu | a197f66 | 2019-11-08 08:09:12 -0700 | [diff] [blame] | 7190 | if (state->plug_started) |
Pavel Begunkov | 32fe525 | 2019-12-17 22:26:58 +0300 | [diff] [blame] | 7191 | blk_finish_plug(&state->plug); |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7192 | } |
Pavel Begunkov | 32fe525 | 2019-12-17 22:26:58 +0300 | [diff] [blame] | 7193 | |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7194 | /* |
| 7195 | * Start submission side cache. |
Pavel Begunkov | 32fe525 | 2019-12-17 22:26:58 +0300 | [diff] [blame] | 7196 | */ |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7197 | static void io_submit_state_start(struct io_submit_state *state, |
Pavel Begunkov | 196be95 | 2019-11-07 01:41:06 +0300 | [diff] [blame] | 7198 | unsigned int max_ios) |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7199 | { |
| 7200 | state->plug_started = false; |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 7201 | state->ios_left = max_ios; |
Pavel Begunkov | a1ab7b3 | 2021-02-18 18:29:42 +0000 | [diff] [blame] | 7202 | /* set only head, no need to init link_last in advance */ |
| 7203 | state->link.head = NULL; |
Jens Axboe | 75c6a03 | 2020-01-28 10:15:23 -0700 | [diff] [blame] | 7204 | } |
| 7205 | |
Jens Axboe | 193155c | 2020-02-22 23:22:19 -0700 | [diff] [blame] | 7206 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
| 7207 | { |
Jens Axboe | 75c6a03 | 2020-01-28 10:15:23 -0700 | [diff] [blame] | 7208 | struct io_rings *rings = ctx->rings; |
| 7209 | |
| 7210 | /* |
Jens Axboe | 193155c | 2020-02-22 23:22:19 -0700 | [diff] [blame] | 7211 | * Ensure any loads from the SQEs are done at this point, |
Jens Axboe | 75c6a03 | 2020-01-28 10:15:23 -0700 | [diff] [blame] | 7212 | * since once we write the new head, the application could |
| 7213 | * write new data to them. |
Pavel Begunkov | 6b47ee6 | 2020-01-18 20:22:41 +0300 | [diff] [blame] | 7214 | */ |
Pavel Begunkov | 8da11c1 | 2020-02-24 11:32:44 +0300 | [diff] [blame] | 7215 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); |
Jens Axboe | bcda7ba | 2020-02-23 16:42:51 -0700 | [diff] [blame] | 7216 | } |
| 7217 | |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7218 | /* |
Fam Zheng | dd9ae8a | 2021-06-04 17:42:56 +0100 | [diff] [blame] | 7219 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7220 | * that is mapped by userspace. This means that care needs to be taken to |
| 7221 | * ensure that reads are stable, as we cannot rely on userspace always |
Jens Axboe | 78e19bb | 2019-11-06 15:21:34 -0700 | [diff] [blame] | 7222 | * being a good citizen. If members of the sqe are validated and then later |
| 7223 | * used, it's important that those reads are done through READ_ONCE() to |
Pavel Begunkov | 2e6e1fd | 2019-12-05 16:15:45 +0300 | [diff] [blame] | 7224 | * prevent a re-load down the line. |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7225 | */ |
| 7226 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7227 | { |
Pavel Begunkov | ea5ab3b | 2021-05-16 22:58:09 +0100 | [diff] [blame] | 7228 | unsigned head, mask = ctx->sq_entries - 1; |
Pavel Begunkov | 17d3aeb | 2021-06-14 23:37:23 +0100 | [diff] [blame] | 7229 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7230 | |
| 7231 | /* |
| 7232 | * The cached sq head (or cq tail) serves two purposes: |
| 7233 | * |
| 7234 | * 1) allows us to batch the cost of updating the user visible |
Pavel Begunkov | 9d76377 | 2019-12-17 02:22:07 +0300 | [diff] [blame] | 7235 | * head updates. |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7236 | * 2) allows the kernel side to track the head on its own, even |
Pavel Begunkov | 8cdf219 | 2020-01-25 00:40:24 +0300 | [diff] [blame] | 7237 | * though the application is the one updating it. |
| 7238 | */ |
Pavel Begunkov | 17d3aeb | 2021-06-14 23:37:23 +0100 | [diff] [blame] | 7239 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
Pavel Begunkov | 8cdf219 | 2020-01-25 00:40:24 +0300 | [diff] [blame] | 7240 | if (likely(head < ctx->sq_entries)) |
| 7241 | return &ctx->sq_sqes[head]; |
| 7242 | |
| 7243 | /* drop invalid entries */ |
Pavel Begunkov | 15641e4 | 2021-06-14 23:37:24 +0100 | [diff] [blame] | 7244 | ctx->cq_extra--; |
| 7245 | WRITE_ONCE(ctx->rings->sq_dropped, |
| 7246 | READ_ONCE(ctx->rings->sq_dropped) + 1); |
Pavel Begunkov | 711be03 | 2020-01-17 03:57:59 +0300 | [diff] [blame] | 7247 | return NULL; |
| 7248 | } |
Jens Axboe | b7bb4f7 | 2019-12-15 22:13:43 -0700 | [diff] [blame] | 7249 | |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 7250 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
Pavel Begunkov | 282cdc8 | 2021-08-09 13:04:10 +0100 | [diff] [blame] | 7251 | __must_hold(&ctx->uring_lock) |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7252 | { |
Pavel Begunkov | 46c4e16 | 2021-02-18 18:29:37 +0000 | [diff] [blame] | 7253 | int submitted = 0; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7254 | |
Pavel Begunkov | ee7d46d9 | 2019-12-30 21:24:45 +0300 | [diff] [blame] | 7255 | /* make sure SQ entry isn't read before tail */ |
| 7256 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); |
Pavel Begunkov | 2b85edf | 2019-12-28 14:13:03 +0300 | [diff] [blame] | 7257 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
| 7258 | return -EAGAIN; |
Pavel Begunkov | 9a10867 | 2021-08-27 11:55:01 +0100 | [diff] [blame] | 7259 | io_get_task_refs(nr); |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7260 | |
Pavel Begunkov | ba88ff1 | 2021-02-10 00:03:11 +0000 | [diff] [blame] | 7261 | io_submit_state_start(&ctx->submit_state, nr); |
Pavel Begunkov | 46c4e16 | 2021-02-18 18:29:37 +0000 | [diff] [blame] | 7262 | while (submitted < nr) { |
Jens Axboe | 3529d8c | 2019-12-19 18:24:38 -0700 | [diff] [blame] | 7263 | const struct io_uring_sqe *sqe; |
Pavel Begunkov | 196be95 | 2019-11-07 01:41:06 +0300 | [diff] [blame] | 7264 | struct io_kiocb *req; |
Pavel Begunkov | fb5ccc9 | 2019-10-25 12:31:30 +0300 | [diff] [blame] | 7265 | |
Pavel Begunkov | 258b29a | 2021-02-10 00:03:10 +0000 | [diff] [blame] | 7266 | req = io_alloc_req(ctx); |
Pavel Begunkov | 196be95 | 2019-11-07 01:41:06 +0300 | [diff] [blame] | 7267 | if (unlikely(!req)) { |
| 7268 | if (!submitted) |
| 7269 | submitted = -EAGAIN; |
Pavel Begunkov | fb5ccc9 | 2019-10-25 12:31:30 +0300 | [diff] [blame] | 7270 | break; |
Jens Axboe | 9e645e11 | 2019-05-10 16:07:28 -0600 | [diff] [blame] | 7271 | } |
Pavel Begunkov | 4fccfcb | 2021-02-12 11:55:17 +0000 | [diff] [blame] | 7272 | sqe = io_get_sqe(ctx); |
| 7273 | if (unlikely(!sqe)) { |
Hao Xu | 0c6e1d7 | 2021-08-26 01:58:56 +0800 | [diff] [blame] | 7274 | list_add(&req->inflight_entry, &ctx->submit_state.free_list); |
Pavel Begunkov | 4fccfcb | 2021-02-12 11:55:17 +0000 | [diff] [blame] | 7275 | break; |
| 7276 | } |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 7277 | /* will complete beyond this point, count as submitted */ |
| 7278 | submitted++; |
Pavel Begunkov | a1ab7b3 | 2021-02-18 18:29:42 +0000 | [diff] [blame] | 7279 | if (io_submit_sqe(ctx, req, sqe)) |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 7280 | break; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7281 | } |
| 7282 | |
Pavel Begunkov | 9466f43 | 2020-01-25 22:34:01 +0300 | [diff] [blame] | 7283 | if (unlikely(submitted != nr)) { |
| 7284 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; |
Jens Axboe | d8a6df1 | 2020-10-15 16:24:45 -0600 | [diff] [blame] | 7285 | int unused = nr - ref_used; |
Pavel Begunkov | 9466f43 | 2020-01-25 22:34:01 +0300 | [diff] [blame] | 7286 | |
Pavel Begunkov | 09899b1 | 2021-06-14 02:36:22 +0100 | [diff] [blame] | 7287 | current->io_uring->cached_refs += unused; |
Jens Axboe | d8a6df1 | 2020-10-15 16:24:45 -0600 | [diff] [blame] | 7288 | percpu_ref_put_many(&ctx->refs, unused); |
Pavel Begunkov | 9466f43 | 2020-01-25 22:34:01 +0300 | [diff] [blame] | 7289 | } |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7290 | |
Pavel Begunkov | a1ab7b3 | 2021-02-18 18:29:42 +0000 | [diff] [blame] | 7291 | io_submit_state_end(&ctx->submit_state, ctx); |
Pavel Begunkov | ae9428c | 2019-11-06 00:22:14 +0300 | [diff] [blame] | 7292 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
| 7293 | io_commit_sqring(ctx); |
| 7294 | |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7295 | return submitted; |
| 7296 | } |
| 7297 | |
Pavel Begunkov | e4b6d90 | 2021-05-16 22:58:00 +0100 | [diff] [blame] | 7298 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
| 7299 | { |
| 7300 | return READ_ONCE(sqd->state); |
| 7301 | } |
| 7302 | |
Xiaoguang Wang | 23b3628 | 2020-07-23 20:57:24 +0800 | [diff] [blame] | 7303 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
| 7304 | { |
| 7305 | /* Tell userspace we may need a wakeup call */ |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 7306 | spin_lock(&ctx->completion_lock); |
Nadav Amit | 20c0b38 | 2021-08-07 17:13:42 -0700 | [diff] [blame] | 7307 | WRITE_ONCE(ctx->rings->sq_flags, |
| 7308 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 7309 | spin_unlock(&ctx->completion_lock); |
Xiaoguang Wang | 23b3628 | 2020-07-23 20:57:24 +0800 | [diff] [blame] | 7310 | } |
| 7311 | |
| 7312 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) |
| 7313 | { |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 7314 | spin_lock(&ctx->completion_lock); |
Nadav Amit | 20c0b38 | 2021-08-07 17:13:42 -0700 | [diff] [blame] | 7315 | WRITE_ONCE(ctx->rings->sq_flags, |
| 7316 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 7317 | spin_unlock(&ctx->completion_lock); |
Xiaoguang Wang | 23b3628 | 2020-07-23 20:57:24 +0800 | [diff] [blame] | 7318 | } |
| 7319 | |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7320 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7321 | { |
Jens Axboe | c8d1ba5 | 2020-09-14 11:07:26 -0600 | [diff] [blame] | 7322 | unsigned int to_submit; |
Xiaoguang Wang | bdcd3ea | 2020-02-25 22:12:08 +0800 | [diff] [blame] | 7323 | int ret = 0; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7324 | |
Jens Axboe | c8d1ba5 | 2020-09-14 11:07:26 -0600 | [diff] [blame] | 7325 | to_submit = io_sqring_entries(ctx); |
Jens Axboe | e95eee2 | 2020-09-08 09:11:32 -0600 | [diff] [blame] | 7326 | /* if we're handling multiple rings, cap submit size for fairness */ |
Olivier Langlois | 4ce8ad9 | 2021-06-23 11:50:18 -0700 | [diff] [blame] | 7327 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
| 7328 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; |
Jens Axboe | e95eee2 | 2020-09-08 09:11:32 -0600 | [diff] [blame] | 7329 | |
Xiaoguang Wang | 906a3c6 | 2020-11-12 14:56:00 +0800 | [diff] [blame] | 7330 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
| 7331 | unsigned nr_events = 0; |
Pavel Begunkov | 948e194 | 2021-06-24 15:09:55 +0100 | [diff] [blame] | 7332 | const struct cred *creds = NULL; |
| 7333 | |
| 7334 | if (ctx->sq_creds != current_cred()) |
| 7335 | creds = override_creds(ctx->sq_creds); |
Xiaoguang Wang | 906a3c6 | 2020-11-12 14:56:00 +0800 | [diff] [blame] | 7336 | |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7337 | mutex_lock(&ctx->uring_lock); |
Xiaoguang Wang | 906a3c6 | 2020-11-12 14:56:00 +0800 | [diff] [blame] | 7338 | if (!list_empty(&ctx->iopoll_list)) |
Pavel Begunkov | a8576af | 2021-08-15 10:40:21 +0100 | [diff] [blame] | 7339 | io_do_iopoll(ctx, &nr_events, 0); |
Xiaoguang Wang | 906a3c6 | 2020-11-12 14:56:00 +0800 | [diff] [blame] | 7340 | |
Pavel Begunkov | 3b763ba | 2021-04-18 14:52:08 +0100 | [diff] [blame] | 7341 | /* |
| 7342 | * Don't submit if refs are dying, good for io_uring_register(), |
| 7343 | * but also it is relied upon by io_ring_exit_work() |
| 7344 | */ |
Pavel Begunkov | 0298ef9 | 2021-03-08 13:20:57 +0000 | [diff] [blame] | 7345 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
| 7346 | !(ctx->flags & IORING_SETUP_R_DISABLED)) |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7347 | ret = io_submit_sqes(ctx, to_submit); |
| 7348 | mutex_unlock(&ctx->uring_lock); |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 7349 | |
Pavel Begunkov | acfb381 | 2021-05-16 22:58:03 +0100 | [diff] [blame] | 7350 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
| 7351 | wake_up(&ctx->sqo_sq_wait); |
Pavel Begunkov | 948e194 | 2021-06-24 15:09:55 +0100 | [diff] [blame] | 7352 | if (creds) |
| 7353 | revert_creds(creds); |
Pavel Begunkov | acfb381 | 2021-05-16 22:58:03 +0100 | [diff] [blame] | 7354 | } |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 7355 | |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7356 | return ret; |
| 7357 | } |
| 7358 | |
| 7359 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
| 7360 | { |
| 7361 | struct io_ring_ctx *ctx; |
| 7362 | unsigned sq_thread_idle = 0; |
| 7363 | |
Pavel Begunkov | c9dca27 | 2021-03-10 13:13:55 +0000 | [diff] [blame] | 7364 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
| 7365 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7366 | sqd->sq_thread_idle = sq_thread_idle; |
Jens Axboe | c8d1ba5 | 2020-09-14 11:07:26 -0600 | [diff] [blame] | 7367 | } |
| 7368 | |
Pavel Begunkov | e4b6d90 | 2021-05-16 22:58:00 +0100 | [diff] [blame] | 7369 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
| 7370 | { |
| 7371 | bool did_sig = false; |
| 7372 | struct ksignal ksig; |
| 7373 | |
| 7374 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || |
| 7375 | signal_pending(current)) { |
| 7376 | mutex_unlock(&sqd->lock); |
| 7377 | if (signal_pending(current)) |
| 7378 | did_sig = get_signal(&ksig); |
| 7379 | cond_resched(); |
| 7380 | mutex_lock(&sqd->lock); |
| 7381 | } |
Pavel Begunkov | e4b6d90 | 2021-05-16 22:58:00 +0100 | [diff] [blame] | 7382 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
| 7383 | } |
| 7384 | |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7385 | static int io_sq_thread(void *data) |
| 7386 | { |
Jens Axboe | 69fb213 | 2020-09-14 11:16:23 -0600 | [diff] [blame] | 7387 | struct io_sq_data *sqd = data; |
| 7388 | struct io_ring_ctx *ctx; |
Xiaoguang Wang | a0d9205f | 2020-11-12 14:55:59 +0800 | [diff] [blame] | 7389 | unsigned long timeout = 0; |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7390 | char buf[TASK_COMM_LEN]; |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7391 | DEFINE_WAIT(wait); |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7392 | |
Pavel Begunkov | 696ee88 | 2021-04-01 09:55:04 +0100 | [diff] [blame] | 7393 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7394 | set_task_comm(current, buf); |
Jens Axboe | 28cea78a | 2020-09-14 10:51:17 -0600 | [diff] [blame] | 7395 | |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7396 | if (sqd->sq_cpu != -1) |
| 7397 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); |
| 7398 | else |
| 7399 | set_cpus_allowed_ptr(current, cpu_online_mask); |
| 7400 | current->flags |= PF_NO_SETAFFINITY; |
| 7401 | |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 7402 | audit_alloc_kernel(current); |
| 7403 | |
Pavel Begunkov | 09a6f4e | 2021-03-14 20:57:10 +0000 | [diff] [blame] | 7404 | mutex_lock(&sqd->lock); |
Pavel Begunkov | e4b6d90 | 2021-05-16 22:58:00 +0100 | [diff] [blame] | 7405 | while (1) { |
Pavel Begunkov | 1a924a8 | 2021-06-24 15:09:56 +0100 | [diff] [blame] | 7406 | bool cap_entries, sqt_spin = false; |
Jens Axboe | c1edbf5 | 2019-11-10 16:56:04 -0700 | [diff] [blame] | 7407 | |
Pavel Begunkov | e4b6d90 | 2021-05-16 22:58:00 +0100 | [diff] [blame] | 7408 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
| 7409 | if (io_sqd_handle_event(sqd)) |
Pavel Begunkov | c7d9561 | 2021-04-13 11:43:00 +0100 | [diff] [blame] | 7410 | break; |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7411 | timeout = jiffies + sqd->sq_thread_idle; |
| 7412 | } |
Pavel Begunkov | e4b6d90 | 2021-05-16 22:58:00 +0100 | [diff] [blame] | 7413 | |
Jens Axboe | e95eee2 | 2020-09-08 09:11:32 -0600 | [diff] [blame] | 7414 | cap_entries = !list_is_singular(&sqd->ctx_list); |
Jens Axboe | 69fb213 | 2020-09-14 11:16:23 -0600 | [diff] [blame] | 7415 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
Pavel Begunkov | 948e194 | 2021-06-24 15:09:55 +0100 | [diff] [blame] | 7416 | int ret = __io_sq_thread(ctx, cap_entries); |
Stefan Metzmacher | 7c30f36a | 2021-03-07 11:54:28 +0100 | [diff] [blame] | 7417 | |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7418 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) |
| 7419 | sqt_spin = true; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7420 | } |
Pavel Begunkov | dd432ea5 | 2021-06-26 21:40:45 +0100 | [diff] [blame] | 7421 | if (io_run_task_work()) |
| 7422 | sqt_spin = true; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7423 | |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7424 | if (sqt_spin || !time_after(jiffies, timeout)) { |
Jens Axboe | c8d1ba5 | 2020-09-14 11:07:26 -0600 | [diff] [blame] | 7425 | cond_resched(); |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7426 | if (sqt_spin) |
| 7427 | timeout = jiffies + sqd->sq_thread_idle; |
| 7428 | continue; |
| 7429 | } |
| 7430 | |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7431 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
Pavel Begunkov | dd432ea5 | 2021-06-26 21:40:45 +0100 | [diff] [blame] | 7432 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
Pavel Begunkov | 1a924a8 | 2021-06-24 15:09:56 +0100 | [diff] [blame] | 7433 | bool needs_sched = true; |
| 7434 | |
Hao Xu | 724cb4f | 2021-04-21 23:19:11 +0800 | [diff] [blame] | 7435 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
Pavel Begunkov | aaa9f0f | 2021-05-16 22:58:01 +0100 | [diff] [blame] | 7436 | io_ring_set_wakeup_flag(ctx); |
| 7437 | |
Hao Xu | 724cb4f | 2021-04-21 23:19:11 +0800 | [diff] [blame] | 7438 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
| 7439 | !list_empty_careful(&ctx->iopoll_list)) { |
| 7440 | needs_sched = false; |
| 7441 | break; |
| 7442 | } |
| 7443 | if (io_sqring_entries(ctx)) { |
| 7444 | needs_sched = false; |
| 7445 | break; |
| 7446 | } |
| 7447 | } |
| 7448 | |
| 7449 | if (needs_sched) { |
| 7450 | mutex_unlock(&sqd->lock); |
| 7451 | schedule(); |
| 7452 | mutex_lock(&sqd->lock); |
| 7453 | } |
Jens Axboe | 69fb213 | 2020-09-14 11:16:23 -0600 | [diff] [blame] | 7454 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
| 7455 | io_ring_clear_wakeup_flag(ctx); |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7456 | } |
Xiaoguang Wang | 0836924 | 2020-11-03 14:15:59 +0800 | [diff] [blame] | 7457 | |
| 7458 | finish_wait(&sqd->wait, &wait); |
| 7459 | timeout = jiffies + sqd->sq_thread_idle; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7460 | } |
| 7461 | |
Pavel Begunkov | 78cc687 | 2021-06-14 02:36:23 +0100 | [diff] [blame] | 7462 | io_uring_cancel_generic(true, sqd); |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7463 | sqd->thread = NULL; |
Jens Axboe | 05962f9 | 2021-03-06 13:58:48 -0700 | [diff] [blame] | 7464 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
Jens Axboe | 5f3f26f | 2021-02-25 10:17:46 -0700 | [diff] [blame] | 7465 | io_ring_set_wakeup_flag(ctx); |
Pavel Begunkov | 521d6a7 | 2021-03-11 23:29:38 +0000 | [diff] [blame] | 7466 | io_run_task_work(); |
Pavel Begunkov | 734551d | 2021-04-18 14:52:09 +0100 | [diff] [blame] | 7467 | mutex_unlock(&sqd->lock); |
| 7468 | |
Paul Moore | 5bd2182 | 2021-02-16 19:46:48 -0500 | [diff] [blame^] | 7469 | audit_free(current); |
| 7470 | |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7471 | complete(&sqd->exited); |
| 7472 | do_exit(0); |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7473 | } |
| 7474 | |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7475 | struct io_wait_queue { |
| 7476 | struct wait_queue_entry wq; |
| 7477 | struct io_ring_ctx *ctx; |
Jens Axboe | 5fd4617 | 2021-08-06 14:04:31 -0600 | [diff] [blame] | 7478 | unsigned cq_tail; |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7479 | unsigned nr_timeouts; |
| 7480 | }; |
| 7481 | |
Pavel Begunkov | 6c50315 | 2021-01-04 20:36:36 +0000 | [diff] [blame] | 7482 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7483 | { |
| 7484 | struct io_ring_ctx *ctx = iowq->ctx; |
Jens Axboe | 5fd4617 | 2021-08-06 14:04:31 -0600 | [diff] [blame] | 7485 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7486 | |
| 7487 | /* |
Brian Gianforcaro | d195a66 | 2019-12-13 03:09:50 -0800 | [diff] [blame] | 7488 | * Wake up if we have enough events, or if a timeout occurred since we |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7489 | * started waiting. For timeouts, we always want to return to userspace, |
| 7490 | * regardless of event count. |
| 7491 | */ |
Jens Axboe | 5fd4617 | 2021-08-06 14:04:31 -0600 | [diff] [blame] | 7492 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7493 | } |
| 7494 | |
| 7495 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, |
| 7496 | int wake_flags, void *key) |
| 7497 | { |
| 7498 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, |
| 7499 | wq); |
| 7500 | |
Pavel Begunkov | 6c50315 | 2021-01-04 20:36:36 +0000 | [diff] [blame] | 7501 | /* |
| 7502 | * Cannot safely flush overflowed CQEs from here, ensure we wake up |
| 7503 | * the task, and the next invocation will do it. |
| 7504 | */ |
Pavel Begunkov | 5ed7a37 | 2021-06-14 23:37:27 +0100 | [diff] [blame] | 7505 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
Pavel Begunkov | 6c50315 | 2021-01-04 20:36:36 +0000 | [diff] [blame] | 7506 | return autoremove_wake_function(curr, mode, wake_flags, key); |
| 7507 | return -1; |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7508 | } |
| 7509 | |
Jens Axboe | af9c1a4 | 2020-09-24 13:32:18 -0600 | [diff] [blame] | 7510 | static int io_run_task_work_sig(void) |
| 7511 | { |
| 7512 | if (io_run_task_work()) |
| 7513 | return 1; |
| 7514 | if (!signal_pending(current)) |
| 7515 | return 0; |
Jens Axboe | 0b8cfa9 | 2021-03-21 14:16:08 -0600 | [diff] [blame] | 7516 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
Jens Axboe | 792ee0f6 | 2020-10-22 20:17:18 -0600 | [diff] [blame] | 7517 | return -ERESTARTSYS; |
Jens Axboe | af9c1a4 | 2020-09-24 13:32:18 -0600 | [diff] [blame] | 7518 | return -EINTR; |
| 7519 | } |
| 7520 | |
Pavel Begunkov | eeb60b9 | 2021-02-04 13:51:58 +0000 | [diff] [blame] | 7521 | /* when returns >0, the caller should retry */ |
| 7522 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, |
| 7523 | struct io_wait_queue *iowq, |
| 7524 | signed long *timeout) |
| 7525 | { |
| 7526 | int ret; |
| 7527 | |
| 7528 | /* make sure we run task_work before checking for signals */ |
| 7529 | ret = io_run_task_work_sig(); |
| 7530 | if (ret || io_should_wake(iowq)) |
| 7531 | return ret; |
| 7532 | /* let the caller flush overflows, retry */ |
Pavel Begunkov | 5ed7a37 | 2021-06-14 23:37:27 +0100 | [diff] [blame] | 7533 | if (test_bit(0, &ctx->check_cq_overflow)) |
Pavel Begunkov | eeb60b9 | 2021-02-04 13:51:58 +0000 | [diff] [blame] | 7534 | return 1; |
| 7535 | |
| 7536 | *timeout = schedule_timeout(*timeout); |
| 7537 | return !*timeout ? -ETIME : 1; |
| 7538 | } |
| 7539 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 7540 | /* |
| 7541 | * Wait until events become available, if we don't already have some. The |
| 7542 | * application must reap them itself, as they reside on the shared cq ring. |
| 7543 | */ |
| 7544 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, |
Hao Xu | c73ebb6 | 2020-11-03 10:54:37 +0800 | [diff] [blame] | 7545 | const sigset_t __user *sig, size_t sigsz, |
| 7546 | struct __kernel_timespec __user *uts) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 7547 | { |
Pavel Begunkov | 90291099 | 2021-08-09 09:07:32 -0600 | [diff] [blame] | 7548 | struct io_wait_queue iowq; |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 7549 | struct io_rings *rings = ctx->rings; |
Pavel Begunkov | c1d5a22 | 2021-02-04 13:51:57 +0000 | [diff] [blame] | 7550 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
| 7551 | int ret; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 7552 | |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 7553 | do { |
Pavel Begunkov | 90f6736 | 2021-08-09 20:18:12 +0100 | [diff] [blame] | 7554 | io_cqring_overflow_flush(ctx); |
Pavel Begunkov | 6c50315 | 2021-01-04 20:36:36 +0000 | [diff] [blame] | 7555 | if (io_cqring_events(ctx) >= min_events) |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 7556 | return 0; |
Jens Axboe | 4c6e277 | 2020-07-01 11:29:10 -0600 | [diff] [blame] | 7557 | if (!io_run_task_work()) |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 7558 | break; |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 7559 | } while (1); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 7560 | |
| 7561 | if (sig) { |
Arnd Bergmann | 9e75ad5 | 2019-03-25 15:34:53 +0100 | [diff] [blame] | 7562 | #ifdef CONFIG_COMPAT |
| 7563 | if (in_compat_syscall()) |
| 7564 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, |
Oleg Nesterov | b772434 | 2019-07-16 16:29:53 -0700 | [diff] [blame] | 7565 | sigsz); |
Arnd Bergmann | 9e75ad5 | 2019-03-25 15:34:53 +0100 | [diff] [blame] | 7566 | else |
| 7567 | #endif |
Oleg Nesterov | b772434 | 2019-07-16 16:29:53 -0700 | [diff] [blame] | 7568 | ret = set_user_sigmask(sig, sigsz); |
Arnd Bergmann | 9e75ad5 | 2019-03-25 15:34:53 +0100 | [diff] [blame] | 7569 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 7570 | if (ret) |
| 7571 | return ret; |
| 7572 | } |
| 7573 | |
Hao Xu | c73ebb6 | 2020-11-03 10:54:37 +0800 | [diff] [blame] | 7574 | if (uts) { |
Pavel Begunkov | c1d5a22 | 2021-02-04 13:51:57 +0000 | [diff] [blame] | 7575 | struct timespec64 ts; |
| 7576 | |
Hao Xu | c73ebb6 | 2020-11-03 10:54:37 +0800 | [diff] [blame] | 7577 | if (get_timespec64(&ts, uts)) |
| 7578 | return -EFAULT; |
| 7579 | timeout = timespec64_to_jiffies(&ts); |
| 7580 | } |
| 7581 | |
Pavel Begunkov | 90291099 | 2021-08-09 09:07:32 -0600 | [diff] [blame] | 7582 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
| 7583 | iowq.wq.private = current; |
| 7584 | INIT_LIST_HEAD(&iowq.wq.entry); |
| 7585 | iowq.ctx = ctx; |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7586 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
Jens Axboe | 5fd4617 | 2021-08-06 14:04:31 -0600 | [diff] [blame] | 7587 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
Pavel Begunkov | 90291099 | 2021-08-09 09:07:32 -0600 | [diff] [blame] | 7588 | |
Dmitrii Dolgov | c826bd7 | 2019-10-15 19:02:01 +0200 | [diff] [blame] | 7589 | trace_io_uring_cqring_wait(ctx, min_events); |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7590 | do { |
Jens Axboe | ca0a265 | 2021-03-04 17:15:48 -0700 | [diff] [blame] | 7591 | /* if we can't even flush overflow, don't wait for more */ |
Pavel Begunkov | 90f6736 | 2021-08-09 20:18:12 +0100 | [diff] [blame] | 7592 | if (!io_cqring_overflow_flush(ctx)) { |
Jens Axboe | ca0a265 | 2021-03-04 17:15:48 -0700 | [diff] [blame] | 7593 | ret = -EBUSY; |
| 7594 | break; |
| 7595 | } |
Pavel Begunkov | 311997b | 2021-06-14 23:37:28 +0100 | [diff] [blame] | 7596 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7597 | TASK_INTERRUPTIBLE); |
Pavel Begunkov | eeb60b9 | 2021-02-04 13:51:58 +0000 | [diff] [blame] | 7598 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
Pavel Begunkov | 311997b | 2021-06-14 23:37:28 +0100 | [diff] [blame] | 7599 | finish_wait(&ctx->cq_wait, &iowq.wq); |
Jens Axboe | ca0a265 | 2021-03-04 17:15:48 -0700 | [diff] [blame] | 7600 | cond_resched(); |
Pavel Begunkov | eeb60b9 | 2021-02-04 13:51:58 +0000 | [diff] [blame] | 7601 | } while (ret > 0); |
Jens Axboe | bda5216 | 2019-09-24 13:47:15 -0600 | [diff] [blame] | 7602 | |
Jens Axboe | b7db41c | 2020-07-04 08:55:50 -0600 | [diff] [blame] | 7603 | restore_saved_sigmask_unless(ret == -EINTR); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 7604 | |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 7605 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 7606 | } |
| 7607 | |
Pavel Begunkov | 9123c8f | 2021-06-14 02:36:20 +0100 | [diff] [blame] | 7608 | static void io_free_page_table(void **table, size_t size) |
Pavel Begunkov | 846a4ef | 2021-04-01 15:44:03 +0100 | [diff] [blame] | 7609 | { |
Pavel Begunkov | 9123c8f | 2021-06-14 02:36:20 +0100 | [diff] [blame] | 7610 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
Pavel Begunkov | 846a4ef | 2021-04-01 15:44:03 +0100 | [diff] [blame] | 7611 | |
| 7612 | for (i = 0; i < nr_tables; i++) |
Pavel Begunkov | 9123c8f | 2021-06-14 02:36:20 +0100 | [diff] [blame] | 7613 | kfree(table[i]); |
| 7614 | kfree(table); |
| 7615 | } |
| 7616 | |
| 7617 | static void **io_alloc_page_table(size_t size) |
| 7618 | { |
| 7619 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
| 7620 | size_t init_size = size; |
| 7621 | void **table; |
| 7622 | |
Pavel Begunkov | 0bea96f5 | 2021-08-20 10:36:36 +0100 | [diff] [blame] | 7623 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
Pavel Begunkov | 9123c8f | 2021-06-14 02:36:20 +0100 | [diff] [blame] | 7624 | if (!table) |
| 7625 | return NULL; |
| 7626 | |
| 7627 | for (i = 0; i < nr_tables; i++) { |
Pavel Begunkov | 27f6b31 | 2021-06-15 13:20:13 +0100 | [diff] [blame] | 7628 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
Pavel Begunkov | 9123c8f | 2021-06-14 02:36:20 +0100 | [diff] [blame] | 7629 | |
Pavel Begunkov | 0bea96f5 | 2021-08-20 10:36:36 +0100 | [diff] [blame] | 7630 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
Pavel Begunkov | 9123c8f | 2021-06-14 02:36:20 +0100 | [diff] [blame] | 7631 | if (!table[i]) { |
| 7632 | io_free_page_table(table, init_size); |
| 7633 | return NULL; |
| 7634 | } |
| 7635 | size -= this_size; |
| 7636 | } |
| 7637 | return table; |
Pavel Begunkov | 846a4ef | 2021-04-01 15:44:03 +0100 | [diff] [blame] | 7638 | } |
| 7639 | |
Pavel Begunkov | 28a9fe2 | 2021-04-01 15:43:47 +0100 | [diff] [blame] | 7640 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
| 7641 | { |
| 7642 | percpu_ref_exit(&ref_node->refs); |
| 7643 | kfree(ref_node); |
| 7644 | } |
| 7645 | |
Pavel Begunkov | b9bd2be | 2021-08-09 09:09:47 -0600 | [diff] [blame] | 7646 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
| 7647 | { |
| 7648 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); |
| 7649 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; |
| 7650 | unsigned long flags; |
| 7651 | bool first_add = false; |
| 7652 | |
| 7653 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); |
| 7654 | node->done = true; |
| 7655 | |
| 7656 | while (!list_empty(&ctx->rsrc_ref_list)) { |
| 7657 | node = list_first_entry(&ctx->rsrc_ref_list, |
| 7658 | struct io_rsrc_node, node); |
| 7659 | /* recycle ref nodes in order */ |
| 7660 | if (!node->done) |
| 7661 | break; |
| 7662 | list_del(&node->node); |
| 7663 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); |
| 7664 | } |
| 7665 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); |
| 7666 | |
| 7667 | if (first_add) |
| 7668 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); |
| 7669 | } |
| 7670 | |
| 7671 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) |
| 7672 | { |
| 7673 | struct io_rsrc_node *ref_node; |
| 7674 | |
| 7675 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
| 7676 | if (!ref_node) |
| 7677 | return NULL; |
| 7678 | |
| 7679 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, |
| 7680 | 0, GFP_KERNEL)) { |
| 7681 | kfree(ref_node); |
| 7682 | return NULL; |
| 7683 | } |
| 7684 | INIT_LIST_HEAD(&ref_node->node); |
| 7685 | INIT_LIST_HEAD(&ref_node->rsrc_list); |
| 7686 | ref_node->done = false; |
| 7687 | return ref_node; |
| 7688 | } |
| 7689 | |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 7690 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
| 7691 | struct io_rsrc_data *data_to_kill) |
Pavel Begunkov | 1642b44 | 2020-12-30 21:34:14 +0000 | [diff] [blame] | 7692 | { |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 7693 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
| 7694 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); |
Pavel Begunkov | 82fbcfa | 2021-04-01 15:43:43 +0100 | [diff] [blame] | 7695 | |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 7696 | if (data_to_kill) { |
| 7697 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; |
Pavel Begunkov | 82fbcfa | 2021-04-01 15:43:43 +0100 | [diff] [blame] | 7698 | |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 7699 | rsrc_node->rsrc_data = data_to_kill; |
Jens Axboe | 4956b9e | 2021-08-09 07:49:41 -0600 | [diff] [blame] | 7700 | spin_lock_irq(&ctx->rsrc_ref_lock); |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 7701 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
Jens Axboe | 4956b9e | 2021-08-09 07:49:41 -0600 | [diff] [blame] | 7702 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
Pavel Begunkov | 82fbcfa | 2021-04-01 15:43:43 +0100 | [diff] [blame] | 7703 | |
Pavel Begunkov | 3e94249 | 2021-04-11 01:46:34 +0100 | [diff] [blame] | 7704 | atomic_inc(&data_to_kill->refs); |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 7705 | percpu_ref_kill(&rsrc_node->refs); |
| 7706 | ctx->rsrc_node = NULL; |
| 7707 | } |
| 7708 | |
| 7709 | if (!ctx->rsrc_node) { |
| 7710 | ctx->rsrc_node = ctx->rsrc_backup_node; |
| 7711 | ctx->rsrc_backup_node = NULL; |
| 7712 | } |
Pavel Begunkov | 1642b44 | 2020-12-30 21:34:14 +0000 | [diff] [blame] | 7713 | } |
| 7714 | |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 7715 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
Pavel Begunkov | 8dd03af | 2021-03-19 17:22:36 +0000 | [diff] [blame] | 7716 | { |
| 7717 | if (ctx->rsrc_backup_node) |
| 7718 | return 0; |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 7719 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
Pavel Begunkov | 8dd03af | 2021-03-19 17:22:36 +0000 | [diff] [blame] | 7720 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
| 7721 | } |
| 7722 | |
Pavel Begunkov | 40ae0ff | 2021-04-01 15:43:44 +0100 | [diff] [blame] | 7723 | static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, struct io_ring_ctx *ctx) |
Hao Xu | 8bad28d | 2021-02-19 17:19:36 +0800 | [diff] [blame] | 7724 | { |
| 7725 | int ret; |
Xiaoguang Wang | 0558955 | 2020-03-31 14:05:18 +0800 | [diff] [blame] | 7726 | |
Pavel Begunkov | 215c390 | 2021-04-01 15:43:48 +0100 | [diff] [blame] | 7727 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
Hao Xu | 8bad28d | 2021-02-19 17:19:36 +0800 | [diff] [blame] | 7728 | if (data->quiesce) |
| 7729 | return -ENXIO; |
| 7730 | |
| 7731 | data->quiesce = true; |
Pavel Begunkov | 1ffc542 | 2020-12-30 21:34:15 +0000 | [diff] [blame] | 7732 | do { |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 7733 | ret = io_rsrc_node_switch_start(ctx); |
Pavel Begunkov | 8dd03af | 2021-03-19 17:22:36 +0000 | [diff] [blame] | 7734 | if (ret) |
Pavel Begunkov | f2303b1 | 2021-02-20 18:03:49 +0000 | [diff] [blame] | 7735 | break; |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 7736 | io_rsrc_node_switch(ctx, data); |
| 7737 | |
Pavel Begunkov | 3e94249 | 2021-04-11 01:46:34 +0100 | [diff] [blame] | 7738 | /* kill initial ref, already quiesced if zero */ |
| 7739 | if (atomic_dec_and_test(&data->refs)) |
| 7740 | break; |
Jens Axboe | c018db4 | 2021-08-09 08:15:50 -0600 | [diff] [blame] | 7741 | mutex_unlock(&ctx->uring_lock); |
Hao Xu | 8bad28d | 2021-02-19 17:19:36 +0800 | [diff] [blame] | 7742 | flush_delayed_work(&ctx->rsrc_put_work); |
Pavel Begunkov | 1ffc542 | 2020-12-30 21:34:15 +0000 | [diff] [blame] | 7743 | ret = wait_for_completion_interruptible(&data->done); |
Jens Axboe | c018db4 | 2021-08-09 08:15:50 -0600 | [diff] [blame] | 7744 | if (!ret) { |
| 7745 | mutex_lock(&ctx->uring_lock); |
Pavel Begunkov | 1ffc542 | 2020-12-30 21:34:15 +0000 | [diff] [blame] | 7746 | break; |
Jens Axboe | c018db4 | 2021-08-09 08:15:50 -0600 | [diff] [blame] | 7747 | } |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 7748 | |
Pavel Begunkov | 3e94249 | 2021-04-11 01:46:34 +0100 | [diff] [blame] | 7749 | atomic_inc(&data->refs); |
| 7750 | /* wait for all works potentially completing data->done */ |
| 7751 | flush_delayed_work(&ctx->rsrc_put_work); |
Jens Axboe | cb5e1b8 | 2021-02-25 07:37:35 -0700 | [diff] [blame] | 7752 | reinit_completion(&data->done); |
Pavel Begunkov | 8dd03af | 2021-03-19 17:22:36 +0000 | [diff] [blame] | 7753 | |
Hao Xu | 8bad28d | 2021-02-19 17:19:36 +0800 | [diff] [blame] | 7754 | ret = io_run_task_work_sig(); |
| 7755 | mutex_lock(&ctx->uring_lock); |
Pavel Begunkov | f2303b1 | 2021-02-20 18:03:49 +0000 | [diff] [blame] | 7756 | } while (ret >= 0); |
Hao Xu | 8bad28d | 2021-02-19 17:19:36 +0800 | [diff] [blame] | 7757 | data->quiesce = false; |
| 7758 | |
Hao Xu | 8bad28d | 2021-02-19 17:19:36 +0800 | [diff] [blame] | 7759 | return ret; |
Bijan Mottahedeh | d7954b2 | 2021-01-15 17:37:50 +0000 | [diff] [blame] | 7760 | } |
| 7761 | |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 7762 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
| 7763 | { |
| 7764 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; |
| 7765 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; |
| 7766 | |
| 7767 | return &data->tags[table_idx][off]; |
| 7768 | } |
| 7769 | |
Pavel Begunkov | 44b31f2 | 2021-04-25 14:32:16 +0100 | [diff] [blame] | 7770 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
| 7771 | { |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 7772 | size_t size = data->nr * sizeof(data->tags[0][0]); |
| 7773 | |
| 7774 | if (data->tags) |
| 7775 | io_free_page_table((void **)data->tags, size); |
Pavel Begunkov | 44b31f2 | 2021-04-25 14:32:16 +0100 | [diff] [blame] | 7776 | kfree(data); |
| 7777 | } |
| 7778 | |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 7779 | static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
| 7780 | u64 __user *utags, unsigned nr, |
| 7781 | struct io_rsrc_data **pdata) |
Bijan Mottahedeh | 1ad555c | 2021-01-15 17:37:51 +0000 | [diff] [blame] | 7782 | { |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 7783 | struct io_rsrc_data *data; |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 7784 | int ret = -ENOMEM; |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 7785 | unsigned i; |
Bijan Mottahedeh | 1ad555c | 2021-01-15 17:37:51 +0000 | [diff] [blame] | 7786 | |
| 7787 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
| 7788 | if (!data) |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 7789 | return -ENOMEM; |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 7790 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
Pavel Begunkov | b60c8dc | 2021-04-25 14:32:18 +0100 | [diff] [blame] | 7791 | if (!data->tags) { |
| 7792 | kfree(data); |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 7793 | return -ENOMEM; |
| 7794 | } |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 7795 | |
| 7796 | data->nr = nr; |
| 7797 | data->ctx = ctx; |
| 7798 | data->do_put = do_put; |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 7799 | if (utags) { |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 7800 | ret = -EFAULT; |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 7801 | for (i = 0; i < nr; i++) { |
Colin Ian King | fdd1dc3 | 2021-06-15 14:00:11 +0100 | [diff] [blame] | 7802 | u64 *tag_slot = io_get_tag_slot(data, i); |
| 7803 | |
| 7804 | if (copy_from_user(tag_slot, &utags[i], |
| 7805 | sizeof(*tag_slot))) |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 7806 | goto fail; |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 7807 | } |
Pavel Begunkov | b60c8dc | 2021-04-25 14:32:18 +0100 | [diff] [blame] | 7808 | } |
| 7809 | |
Pavel Begunkov | 3e94249 | 2021-04-11 01:46:34 +0100 | [diff] [blame] | 7810 | atomic_set(&data->refs, 1); |
Bijan Mottahedeh | 1ad555c | 2021-01-15 17:37:51 +0000 | [diff] [blame] | 7811 | init_completion(&data->done); |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 7812 | *pdata = data; |
| 7813 | return 0; |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 7814 | fail: |
| 7815 | io_rsrc_data_free(data); |
| 7816 | return ret; |
Bijan Mottahedeh | 1ad555c | 2021-01-15 17:37:51 +0000 | [diff] [blame] | 7817 | } |
| 7818 | |
Pavel Begunkov | 9123c8f | 2021-06-14 02:36:20 +0100 | [diff] [blame] | 7819 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
| 7820 | { |
Pavel Begunkov | 0bea96f5 | 2021-08-20 10:36:36 +0100 | [diff] [blame] | 7821 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
| 7822 | GFP_KERNEL_ACCOUNT); |
Pavel Begunkov | 9123c8f | 2021-06-14 02:36:20 +0100 | [diff] [blame] | 7823 | return !!table->files; |
| 7824 | } |
| 7825 | |
Pavel Begunkov | 042b0d8 | 2021-08-09 13:04:01 +0100 | [diff] [blame] | 7826 | static void io_free_file_tables(struct io_file_table *table) |
Pavel Begunkov | 9123c8f | 2021-06-14 02:36:20 +0100 | [diff] [blame] | 7827 | { |
Pavel Begunkov | 042b0d8 | 2021-08-09 13:04:01 +0100 | [diff] [blame] | 7828 | kvfree(table->files); |
Pavel Begunkov | 9123c8f | 2021-06-14 02:36:20 +0100 | [diff] [blame] | 7829 | table->files = NULL; |
| 7830 | } |
| 7831 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 7832 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
| 7833 | { |
| 7834 | #if defined(CONFIG_UNIX) |
| 7835 | if (ctx->ring_sock) { |
| 7836 | struct sock *sock = ctx->ring_sock->sk; |
| 7837 | struct sk_buff *skb; |
| 7838 | |
| 7839 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) |
| 7840 | kfree_skb(skb); |
| 7841 | } |
| 7842 | #else |
| 7843 | int i; |
| 7844 | |
| 7845 | for (i = 0; i < ctx->nr_user_files; i++) { |
| 7846 | struct file *file; |
| 7847 | |
| 7848 | file = io_file_from_index(ctx, i); |
| 7849 | if (file) |
| 7850 | fput(file); |
| 7851 | } |
| 7852 | #endif |
Pavel Begunkov | 042b0d8 | 2021-08-09 13:04:01 +0100 | [diff] [blame] | 7853 | io_free_file_tables(&ctx->file_table); |
Pavel Begunkov | 44b31f2 | 2021-04-25 14:32:16 +0100 | [diff] [blame] | 7854 | io_rsrc_data_free(ctx->file_data); |
Pavel Begunkov | fff4db7 | 2021-04-25 14:32:15 +0100 | [diff] [blame] | 7855 | ctx->file_data = NULL; |
| 7856 | ctx->nr_user_files = 0; |
Bijan Mottahedeh | 1ad555c | 2021-01-15 17:37:51 +0000 | [diff] [blame] | 7857 | } |
| 7858 | |
Bijan Mottahedeh | d7954b2 | 2021-01-15 17:37:50 +0000 | [diff] [blame] | 7859 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
| 7860 | { |
Bijan Mottahedeh | d7954b2 | 2021-01-15 17:37:50 +0000 | [diff] [blame] | 7861 | int ret; |
| 7862 | |
Pavel Begunkov | 0848040 | 2021-04-13 02:58:38 +0100 | [diff] [blame] | 7863 | if (!ctx->file_data) |
Bijan Mottahedeh | d7954b2 | 2021-01-15 17:37:50 +0000 | [diff] [blame] | 7864 | return -ENXIO; |
Pavel Begunkov | 0848040 | 2021-04-13 02:58:38 +0100 | [diff] [blame] | 7865 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
| 7866 | if (!ret) |
| 7867 | __io_sqe_files_unregister(ctx); |
| 7868 | return ret; |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 7869 | } |
| 7870 | |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7871 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
Pavel Begunkov | 09a6f4e | 2021-03-14 20:57:10 +0000 | [diff] [blame] | 7872 | __releases(&sqd->lock) |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7873 | { |
Pavel Begunkov | 521d6a7 | 2021-03-11 23:29:38 +0000 | [diff] [blame] | 7874 | WARN_ON_ONCE(sqd->thread == current); |
| 7875 | |
Pavel Begunkov | 9e138a4 | 2021-03-14 20:57:12 +0000 | [diff] [blame] | 7876 | /* |
| 7877 | * Do the dance but not conditional clear_bit() because it'd race with |
| 7878 | * other threads incrementing park_pending and setting the bit. |
| 7879 | */ |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7880 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
Pavel Begunkov | 9e138a4 | 2021-03-14 20:57:12 +0000 | [diff] [blame] | 7881 | if (atomic_dec_return(&sqd->park_pending)) |
| 7882 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
Pavel Begunkov | 09a6f4e | 2021-03-14 20:57:10 +0000 | [diff] [blame] | 7883 | mutex_unlock(&sqd->lock); |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7884 | } |
| 7885 | |
Jens Axboe | 86e0d67 | 2021-03-05 08:44:39 -0700 | [diff] [blame] | 7886 | static void io_sq_thread_park(struct io_sq_data *sqd) |
Pavel Begunkov | 09a6f4e | 2021-03-14 20:57:10 +0000 | [diff] [blame] | 7887 | __acquires(&sqd->lock) |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7888 | { |
Pavel Begunkov | 521d6a7 | 2021-03-11 23:29:38 +0000 | [diff] [blame] | 7889 | WARN_ON_ONCE(sqd->thread == current); |
| 7890 | |
Pavel Begunkov | 9e138a4 | 2021-03-14 20:57:12 +0000 | [diff] [blame] | 7891 | atomic_inc(&sqd->park_pending); |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7892 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
Pavel Begunkov | 09a6f4e | 2021-03-14 20:57:10 +0000 | [diff] [blame] | 7893 | mutex_lock(&sqd->lock); |
Jens Axboe | 05962f9 | 2021-03-06 13:58:48 -0700 | [diff] [blame] | 7894 | if (sqd->thread) |
Jens Axboe | 86e0d67 | 2021-03-05 08:44:39 -0700 | [diff] [blame] | 7895 | wake_up_process(sqd->thread); |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7896 | } |
| 7897 | |
| 7898 | static void io_sq_thread_stop(struct io_sq_data *sqd) |
| 7899 | { |
Pavel Begunkov | 521d6a7 | 2021-03-11 23:29:38 +0000 | [diff] [blame] | 7900 | WARN_ON_ONCE(sqd->thread == current); |
Pavel Begunkov | 88885f6 | 2021-04-11 01:46:38 +0100 | [diff] [blame] | 7901 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
Pavel Begunkov | 521d6a7 | 2021-03-11 23:29:38 +0000 | [diff] [blame] | 7902 | |
Jens Axboe | 05962f9 | 2021-03-06 13:58:48 -0700 | [diff] [blame] | 7903 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
Pavel Begunkov | 88885f6 | 2021-04-11 01:46:38 +0100 | [diff] [blame] | 7904 | mutex_lock(&sqd->lock); |
Jens Axboe | e8f98f24 | 2021-03-09 16:32:13 -0700 | [diff] [blame] | 7905 | if (sqd->thread) |
| 7906 | wake_up_process(sqd->thread); |
Pavel Begunkov | 09a6f4e | 2021-03-14 20:57:10 +0000 | [diff] [blame] | 7907 | mutex_unlock(&sqd->lock); |
Jens Axboe | 05962f9 | 2021-03-06 13:58:48 -0700 | [diff] [blame] | 7908 | wait_for_completion(&sqd->exited); |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7909 | } |
| 7910 | |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 7911 | static void io_put_sq_data(struct io_sq_data *sqd) |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 7912 | { |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 7913 | if (refcount_dec_and_test(&sqd->refs)) { |
Pavel Begunkov | 9e138a4 | 2021-03-14 20:57:12 +0000 | [diff] [blame] | 7914 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
| 7915 | |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7916 | io_sq_thread_stop(sqd); |
| 7917 | kfree(sqd); |
| 7918 | } |
| 7919 | } |
| 7920 | |
| 7921 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) |
| 7922 | { |
| 7923 | struct io_sq_data *sqd = ctx->sq_data; |
| 7924 | |
| 7925 | if (sqd) { |
Jens Axboe | 05962f9 | 2021-03-06 13:58:48 -0700 | [diff] [blame] | 7926 | io_sq_thread_park(sqd); |
Pavel Begunkov | 521d6a7 | 2021-03-11 23:29:38 +0000 | [diff] [blame] | 7927 | list_del_init(&ctx->sqd_list); |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7928 | io_sqd_update_thread_idle(sqd); |
Jens Axboe | 05962f9 | 2021-03-06 13:58:48 -0700 | [diff] [blame] | 7929 | io_sq_thread_unpark(sqd); |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7930 | |
| 7931 | io_put_sq_data(sqd); |
| 7932 | ctx->sq_data = NULL; |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 7933 | } |
| 7934 | } |
| 7935 | |
Jens Axboe | aa06165 | 2020-09-02 14:50:27 -0600 | [diff] [blame] | 7936 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
| 7937 | { |
| 7938 | struct io_ring_ctx *ctx_attach; |
| 7939 | struct io_sq_data *sqd; |
| 7940 | struct fd f; |
| 7941 | |
| 7942 | f = fdget(p->wq_fd); |
| 7943 | if (!f.file) |
| 7944 | return ERR_PTR(-ENXIO); |
| 7945 | if (f.file->f_op != &io_uring_fops) { |
| 7946 | fdput(f); |
| 7947 | return ERR_PTR(-EINVAL); |
| 7948 | } |
| 7949 | |
| 7950 | ctx_attach = f.file->private_data; |
| 7951 | sqd = ctx_attach->sq_data; |
| 7952 | if (!sqd) { |
| 7953 | fdput(f); |
| 7954 | return ERR_PTR(-EINVAL); |
| 7955 | } |
Jens Axboe | 5c2469e | 2021-03-11 10:17:56 -0700 | [diff] [blame] | 7956 | if (sqd->task_tgid != current->tgid) { |
| 7957 | fdput(f); |
| 7958 | return ERR_PTR(-EPERM); |
| 7959 | } |
Jens Axboe | aa06165 | 2020-09-02 14:50:27 -0600 | [diff] [blame] | 7960 | |
| 7961 | refcount_inc(&sqd->refs); |
| 7962 | fdput(f); |
| 7963 | return sqd; |
| 7964 | } |
| 7965 | |
Pavel Begunkov | 26984fb | 2021-03-11 23:29:37 +0000 | [diff] [blame] | 7966 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
| 7967 | bool *attached) |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 7968 | { |
| 7969 | struct io_sq_data *sqd; |
| 7970 | |
Pavel Begunkov | 26984fb | 2021-03-11 23:29:37 +0000 | [diff] [blame] | 7971 | *attached = false; |
Jens Axboe | 5c2469e | 2021-03-11 10:17:56 -0700 | [diff] [blame] | 7972 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
| 7973 | sqd = io_attach_sq_data(p); |
Pavel Begunkov | 26984fb | 2021-03-11 23:29:37 +0000 | [diff] [blame] | 7974 | if (!IS_ERR(sqd)) { |
| 7975 | *attached = true; |
Jens Axboe | 5c2469e | 2021-03-11 10:17:56 -0700 | [diff] [blame] | 7976 | return sqd; |
Pavel Begunkov | 26984fb | 2021-03-11 23:29:37 +0000 | [diff] [blame] | 7977 | } |
Jens Axboe | 5c2469e | 2021-03-11 10:17:56 -0700 | [diff] [blame] | 7978 | /* fall through for EPERM case, setup new sqd/task */ |
| 7979 | if (PTR_ERR(sqd) != -EPERM) |
| 7980 | return sqd; |
| 7981 | } |
Jens Axboe | aa06165 | 2020-09-02 14:50:27 -0600 | [diff] [blame] | 7982 | |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 7983 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
| 7984 | if (!sqd) |
| 7985 | return ERR_PTR(-ENOMEM); |
| 7986 | |
Pavel Begunkov | 9e138a4 | 2021-03-14 20:57:12 +0000 | [diff] [blame] | 7987 | atomic_set(&sqd->park_pending, 0); |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 7988 | refcount_set(&sqd->refs, 1); |
Jens Axboe | 69fb213 | 2020-09-14 11:16:23 -0600 | [diff] [blame] | 7989 | INIT_LIST_HEAD(&sqd->ctx_list); |
Pavel Begunkov | 09a6f4e | 2021-03-14 20:57:10 +0000 | [diff] [blame] | 7990 | mutex_init(&sqd->lock); |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 7991 | init_waitqueue_head(&sqd->wait); |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 7992 | init_completion(&sqd->exited); |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 7993 | return sqd; |
| 7994 | } |
| 7995 | |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 7996 | #if defined(CONFIG_UNIX) |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 7997 | /* |
| 7998 | * Ensure the UNIX gc is aware of our file set, so we are certain that |
| 7999 | * the io_uring can be safely unregistered on process exit, even if we have |
| 8000 | * loops in the file referencing. |
| 8001 | */ |
| 8002 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) |
| 8003 | { |
| 8004 | struct sock *sk = ctx->ring_sock->sk; |
| 8005 | struct scm_fp_list *fpl; |
| 8006 | struct sk_buff *skb; |
Jens Axboe | 08a45173 | 2019-10-03 08:11:03 -0600 | [diff] [blame] | 8007 | int i, nr_files; |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 8008 | |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 8009 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
| 8010 | if (!fpl) |
| 8011 | return -ENOMEM; |
| 8012 | |
| 8013 | skb = alloc_skb(0, GFP_KERNEL); |
| 8014 | if (!skb) { |
| 8015 | kfree(fpl); |
| 8016 | return -ENOMEM; |
| 8017 | } |
| 8018 | |
| 8019 | skb->sk = sk; |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 8020 | |
Jens Axboe | 08a45173 | 2019-10-03 08:11:03 -0600 | [diff] [blame] | 8021 | nr_files = 0; |
Jens Axboe | 62e398b | 2021-02-21 16:19:37 -0700 | [diff] [blame] | 8022 | fpl->user = get_uid(current_user()); |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 8023 | for (i = 0; i < nr; i++) { |
Jens Axboe | 65e19f5 | 2019-10-26 07:20:21 -0600 | [diff] [blame] | 8024 | struct file *file = io_file_from_index(ctx, i + offset); |
| 8025 | |
| 8026 | if (!file) |
Jens Axboe | 08a45173 | 2019-10-03 08:11:03 -0600 | [diff] [blame] | 8027 | continue; |
Jens Axboe | 65e19f5 | 2019-10-26 07:20:21 -0600 | [diff] [blame] | 8028 | fpl->fp[nr_files] = get_file(file); |
Jens Axboe | 08a45173 | 2019-10-03 08:11:03 -0600 | [diff] [blame] | 8029 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
| 8030 | nr_files++; |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 8031 | } |
| 8032 | |
Jens Axboe | 08a45173 | 2019-10-03 08:11:03 -0600 | [diff] [blame] | 8033 | if (nr_files) { |
| 8034 | fpl->max = SCM_MAX_FD; |
| 8035 | fpl->count = nr_files; |
| 8036 | UNIXCB(skb).fp = fpl; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8037 | skb->destructor = unix_destruct_scm; |
Jens Axboe | 08a45173 | 2019-10-03 08:11:03 -0600 | [diff] [blame] | 8038 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
| 8039 | skb_queue_head(&sk->sk_receive_queue, skb); |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 8040 | |
Jens Axboe | 08a45173 | 2019-10-03 08:11:03 -0600 | [diff] [blame] | 8041 | for (i = 0; i < nr_files; i++) |
| 8042 | fput(fpl->fp[i]); |
| 8043 | } else { |
| 8044 | kfree_skb(skb); |
| 8045 | kfree(fpl); |
| 8046 | } |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 8047 | |
| 8048 | return 0; |
| 8049 | } |
| 8050 | |
| 8051 | /* |
| 8052 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which |
| 8053 | * causes regular reference counting to break down. We rely on the UNIX |
| 8054 | * garbage collection to take care of this problem for us. |
| 8055 | */ |
| 8056 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) |
| 8057 | { |
| 8058 | unsigned left, total; |
| 8059 | int ret = 0; |
| 8060 | |
| 8061 | total = 0; |
| 8062 | left = ctx->nr_user_files; |
| 8063 | while (left) { |
| 8064 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 8065 | |
| 8066 | ret = __io_sqe_files_scm(ctx, this_files, total); |
| 8067 | if (ret) |
| 8068 | break; |
| 8069 | left -= this_files; |
| 8070 | total += this_files; |
| 8071 | } |
| 8072 | |
| 8073 | if (!ret) |
| 8074 | return 0; |
| 8075 | |
| 8076 | while (total < ctx->nr_user_files) { |
Jens Axboe | 65e19f5 | 2019-10-26 07:20:21 -0600 | [diff] [blame] | 8077 | struct file *file = io_file_from_index(ctx, total); |
| 8078 | |
| 8079 | if (file) |
| 8080 | fput(file); |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 8081 | total++; |
| 8082 | } |
| 8083 | |
| 8084 | return ret; |
| 8085 | } |
| 8086 | #else |
| 8087 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) |
| 8088 | { |
| 8089 | return 0; |
| 8090 | } |
| 8091 | #endif |
| 8092 | |
Pavel Begunkov | 47e9039 | 2021-04-01 15:43:56 +0100 | [diff] [blame] | 8093 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8094 | { |
Bijan Mottahedeh | 5023853 | 2021-01-15 17:37:45 +0000 | [diff] [blame] | 8095 | struct file *file = prsrc->file; |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8096 | #if defined(CONFIG_UNIX) |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8097 | struct sock *sock = ctx->ring_sock->sk; |
| 8098 | struct sk_buff_head list, *head = &sock->sk_receive_queue; |
| 8099 | struct sk_buff *skb; |
| 8100 | int i; |
| 8101 | |
| 8102 | __skb_queue_head_init(&list); |
| 8103 | |
| 8104 | /* |
| 8105 | * Find the skb that holds this file in its SCM_RIGHTS. When found, |
| 8106 | * remove this entry and rearrange the file array. |
| 8107 | */ |
| 8108 | skb = skb_dequeue(head); |
| 8109 | while (skb) { |
| 8110 | struct scm_fp_list *fp; |
| 8111 | |
| 8112 | fp = UNIXCB(skb).fp; |
| 8113 | for (i = 0; i < fp->count; i++) { |
| 8114 | int left; |
| 8115 | |
| 8116 | if (fp->fp[i] != file) |
| 8117 | continue; |
| 8118 | |
| 8119 | unix_notinflight(fp->user, fp->fp[i]); |
| 8120 | left = fp->count - 1 - i; |
| 8121 | if (left) { |
| 8122 | memmove(&fp->fp[i], &fp->fp[i + 1], |
| 8123 | left * sizeof(struct file *)); |
| 8124 | } |
| 8125 | fp->count--; |
| 8126 | if (!fp->count) { |
| 8127 | kfree_skb(skb); |
| 8128 | skb = NULL; |
| 8129 | } else { |
| 8130 | __skb_queue_tail(&list, skb); |
| 8131 | } |
| 8132 | fput(file); |
| 8133 | file = NULL; |
| 8134 | break; |
| 8135 | } |
| 8136 | |
| 8137 | if (!file) |
| 8138 | break; |
| 8139 | |
| 8140 | __skb_queue_tail(&list, skb); |
| 8141 | |
| 8142 | skb = skb_dequeue(head); |
| 8143 | } |
| 8144 | |
| 8145 | if (skb_peek(&list)) { |
| 8146 | spin_lock_irq(&head->lock); |
| 8147 | while ((skb = __skb_dequeue(&list)) != NULL) |
| 8148 | __skb_queue_tail(head, skb); |
| 8149 | spin_unlock_irq(&head->lock); |
| 8150 | } |
| 8151 | #else |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8152 | fput(file); |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8153 | #endif |
| 8154 | } |
| 8155 | |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 8156 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8157 | { |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 8158 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 8159 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
| 8160 | struct io_rsrc_put *prsrc, *tmp; |
Xiaoguang Wang | 0558955 | 2020-03-31 14:05:18 +0800 | [diff] [blame] | 8161 | |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 8162 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
| 8163 | list_del(&prsrc->list); |
Pavel Begunkov | b60c8dc | 2021-04-25 14:32:18 +0100 | [diff] [blame] | 8164 | |
| 8165 | if (prsrc->tag) { |
| 8166 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; |
Pavel Begunkov | b60c8dc | 2021-04-25 14:32:18 +0100 | [diff] [blame] | 8167 | |
| 8168 | io_ring_submit_lock(ctx, lock_ring); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 8169 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | b60c8dc | 2021-04-25 14:32:18 +0100 | [diff] [blame] | 8170 | io_cqring_fill_event(ctx, prsrc->tag, 0, 0); |
Pavel Begunkov | 2840f71 | 2021-04-27 16:13:51 +0100 | [diff] [blame] | 8171 | ctx->cq_extra++; |
Pavel Begunkov | b60c8dc | 2021-04-25 14:32:18 +0100 | [diff] [blame] | 8172 | io_commit_cqring(ctx); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 8173 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | b60c8dc | 2021-04-25 14:32:18 +0100 | [diff] [blame] | 8174 | io_cqring_ev_posted(ctx); |
| 8175 | io_ring_submit_unlock(ctx, lock_ring); |
| 8176 | } |
| 8177 | |
Pavel Begunkov | 40ae0ff | 2021-04-01 15:43:44 +0100 | [diff] [blame] | 8178 | rsrc_data->do_put(ctx, prsrc); |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 8179 | kfree(prsrc); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8180 | } |
| 8181 | |
Pavel Begunkov | 28a9fe2 | 2021-04-01 15:43:47 +0100 | [diff] [blame] | 8182 | io_rsrc_node_destroy(ref_node); |
Pavel Begunkov | 3e94249 | 2021-04-11 01:46:34 +0100 | [diff] [blame] | 8183 | if (atomic_dec_and_test(&rsrc_data->refs)) |
| 8184 | complete(&rsrc_data->done); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8185 | } |
| 8186 | |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 8187 | static void io_rsrc_put_work(struct work_struct *work) |
Jens Axboe | 4a38aed2 | 2020-05-14 17:21:15 -0600 | [diff] [blame] | 8188 | { |
| 8189 | struct io_ring_ctx *ctx; |
| 8190 | struct llist_node *node; |
| 8191 | |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 8192 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
| 8193 | node = llist_del_all(&ctx->rsrc_put_llist); |
Jens Axboe | 4a38aed2 | 2020-05-14 17:21:15 -0600 | [diff] [blame] | 8194 | |
| 8195 | while (node) { |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 8196 | struct io_rsrc_node *ref_node; |
Jens Axboe | 4a38aed2 | 2020-05-14 17:21:15 -0600 | [diff] [blame] | 8197 | struct llist_node *next = node->next; |
| 8198 | |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 8199 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 8200 | __io_rsrc_put_work(ref_node); |
Jens Axboe | 4a38aed2 | 2020-05-14 17:21:15 -0600 | [diff] [blame] | 8201 | node = next; |
| 8202 | } |
| 8203 | } |
| 8204 | |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8205 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 8206 | unsigned nr_args, u64 __user *tags) |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8207 | { |
| 8208 | __s32 __user *fds = (__s32 __user *) arg; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8209 | struct file *file; |
Pavel Begunkov | f3baed3 | 2021-04-01 15:43:42 +0100 | [diff] [blame] | 8210 | int fd, ret; |
Pavel Begunkov | 846a4ef | 2021-04-01 15:44:03 +0100 | [diff] [blame] | 8211 | unsigned i; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8212 | |
| 8213 | if (ctx->file_data) |
| 8214 | return -EBUSY; |
| 8215 | if (!nr_args) |
| 8216 | return -EINVAL; |
| 8217 | if (nr_args > IORING_MAX_FIXED_FILES) |
| 8218 | return -EMFILE; |
Pavel Begunkov | 3a1b8a4 | 2021-08-20 10:36:35 +0100 | [diff] [blame] | 8219 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
| 8220 | return -EMFILE; |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 8221 | ret = io_rsrc_node_switch_start(ctx); |
Pavel Begunkov | f3baed3 | 2021-04-01 15:43:42 +0100 | [diff] [blame] | 8222 | if (ret) |
| 8223 | return ret; |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 8224 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
| 8225 | &ctx->file_data); |
| 8226 | if (ret) |
| 8227 | return ret; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8228 | |
Pavel Begunkov | f3baed3 | 2021-04-01 15:43:42 +0100 | [diff] [blame] | 8229 | ret = -ENOMEM; |
Pavel Begunkov | aeca241 | 2021-04-11 01:46:37 +0100 | [diff] [blame] | 8230 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
Pavel Begunkov | 600cf3f | 2020-10-10 18:34:15 +0100 | [diff] [blame] | 8231 | goto out_free; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8232 | |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8233 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 8234 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
Pavel Begunkov | 600cf3f | 2020-10-10 18:34:15 +0100 | [diff] [blame] | 8235 | ret = -EFAULT; |
| 8236 | goto out_fput; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8237 | } |
Pavel Begunkov | 600cf3f | 2020-10-10 18:34:15 +0100 | [diff] [blame] | 8238 | /* allow sparse sets */ |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 8239 | if (fd == -1) { |
| 8240 | ret = -EINVAL; |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 8241 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 8242 | goto out_fput; |
Pavel Begunkov | 600cf3f | 2020-10-10 18:34:15 +0100 | [diff] [blame] | 8243 | continue; |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 8244 | } |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8245 | |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8246 | file = fget(fd); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8247 | ret = -EBADF; |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 8248 | if (unlikely(!file)) |
Pavel Begunkov | 600cf3f | 2020-10-10 18:34:15 +0100 | [diff] [blame] | 8249 | goto out_fput; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8250 | |
| 8251 | /* |
| 8252 | * Don't allow io_uring instances to be registered. If UNIX |
| 8253 | * isn't enabled, then this causes a reference cycle and this |
| 8254 | * instance can never get freed. If UNIX is enabled we'll |
| 8255 | * handle it just fine, but there's still no point in allowing |
| 8256 | * a ring fd as it doesn't support regular read/write anyway. |
| 8257 | */ |
| 8258 | if (file->f_op == &io_uring_fops) { |
| 8259 | fput(file); |
Pavel Begunkov | 600cf3f | 2020-10-10 18:34:15 +0100 | [diff] [blame] | 8260 | goto out_fput; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8261 | } |
Pavel Begunkov | aeca241 | 2021-04-11 01:46:37 +0100 | [diff] [blame] | 8262 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8263 | } |
| 8264 | |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8265 | ret = io_sqe_files_scm(ctx); |
Xiaoguang Wang | 0558955 | 2020-03-31 14:05:18 +0800 | [diff] [blame] | 8266 | if (ret) { |
Pavel Begunkov | 0848040 | 2021-04-13 02:58:38 +0100 | [diff] [blame] | 8267 | __io_sqe_files_unregister(ctx); |
Xiaoguang Wang | 0558955 | 2020-03-31 14:05:18 +0800 | [diff] [blame] | 8268 | return ret; |
| 8269 | } |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8270 | |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 8271 | io_rsrc_node_switch(ctx, NULL); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8272 | return ret; |
Pavel Begunkov | 600cf3f | 2020-10-10 18:34:15 +0100 | [diff] [blame] | 8273 | out_fput: |
| 8274 | for (i = 0; i < ctx->nr_user_files; i++) { |
| 8275 | file = io_file_from_index(ctx, i); |
| 8276 | if (file) |
| 8277 | fput(file); |
| 8278 | } |
Pavel Begunkov | 042b0d8 | 2021-08-09 13:04:01 +0100 | [diff] [blame] | 8279 | io_free_file_tables(&ctx->file_table); |
Pavel Begunkov | 600cf3f | 2020-10-10 18:34:15 +0100 | [diff] [blame] | 8280 | ctx->nr_user_files = 0; |
Pavel Begunkov | 600cf3f | 2020-10-10 18:34:15 +0100 | [diff] [blame] | 8281 | out_free: |
Pavel Begunkov | 44b31f2 | 2021-04-25 14:32:16 +0100 | [diff] [blame] | 8282 | io_rsrc_data_free(ctx->file_data); |
Jens Axboe | 55cbc25 | 2020-10-14 07:35:57 -0600 | [diff] [blame] | 8283 | ctx->file_data = NULL; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8284 | return ret; |
| 8285 | } |
| 8286 | |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8287 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
| 8288 | int index) |
| 8289 | { |
| 8290 | #if defined(CONFIG_UNIX) |
| 8291 | struct sock *sock = ctx->ring_sock->sk; |
| 8292 | struct sk_buff_head *head = &sock->sk_receive_queue; |
| 8293 | struct sk_buff *skb; |
| 8294 | |
| 8295 | /* |
| 8296 | * See if we can merge this file into an existing skb SCM_RIGHTS |
| 8297 | * file set. If there's no room, fall back to allocating a new skb |
| 8298 | * and filling it in. |
| 8299 | */ |
| 8300 | spin_lock_irq(&head->lock); |
| 8301 | skb = skb_peek(head); |
| 8302 | if (skb) { |
| 8303 | struct scm_fp_list *fpl = UNIXCB(skb).fp; |
| 8304 | |
| 8305 | if (fpl->count < SCM_MAX_FD) { |
| 8306 | __skb_unlink(skb, head); |
| 8307 | spin_unlock_irq(&head->lock); |
| 8308 | fpl->fp[fpl->count] = get_file(file); |
| 8309 | unix_inflight(fpl->user, fpl->fp[fpl->count]); |
| 8310 | fpl->count++; |
| 8311 | spin_lock_irq(&head->lock); |
| 8312 | __skb_queue_head(head, skb); |
| 8313 | } else { |
| 8314 | skb = NULL; |
| 8315 | } |
| 8316 | } |
| 8317 | spin_unlock_irq(&head->lock); |
| 8318 | |
| 8319 | if (skb) { |
| 8320 | fput(file); |
| 8321 | return 0; |
| 8322 | } |
| 8323 | |
| 8324 | return __io_sqe_files_scm(ctx, 1, index); |
| 8325 | #else |
| 8326 | return 0; |
| 8327 | #endif |
| 8328 | } |
| 8329 | |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 8330 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
| 8331 | unsigned int issue_flags, u32 slot_index) |
| 8332 | { |
| 8333 | struct io_ring_ctx *ctx = req->ctx; |
| 8334 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
| 8335 | struct io_fixed_file *file_slot; |
| 8336 | int ret = -EBADF; |
| 8337 | |
| 8338 | io_ring_submit_lock(ctx, !force_nonblock); |
| 8339 | if (file->f_op == &io_uring_fops) |
| 8340 | goto err; |
| 8341 | ret = -ENXIO; |
| 8342 | if (!ctx->file_data) |
| 8343 | goto err; |
| 8344 | ret = -EINVAL; |
| 8345 | if (slot_index >= ctx->nr_user_files) |
| 8346 | goto err; |
| 8347 | |
| 8348 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); |
| 8349 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); |
| 8350 | ret = -EBADF; |
| 8351 | if (file_slot->file_ptr) |
| 8352 | goto err; |
| 8353 | |
| 8354 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; |
| 8355 | io_fixed_file_set(file_slot, file); |
| 8356 | ret = io_sqe_file_register(ctx, file, slot_index); |
| 8357 | if (ret) { |
| 8358 | file_slot->file_ptr = 0; |
| 8359 | goto err; |
| 8360 | } |
| 8361 | |
| 8362 | ret = 0; |
| 8363 | err: |
| 8364 | io_ring_submit_unlock(ctx, !force_nonblock); |
| 8365 | if (ret) |
| 8366 | fput(file); |
| 8367 | return ret; |
| 8368 | } |
| 8369 | |
Pavel Begunkov | b60c8dc | 2021-04-25 14:32:18 +0100 | [diff] [blame] | 8370 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
Pavel Begunkov | e7c7837 | 2021-04-01 15:43:45 +0100 | [diff] [blame] | 8371 | struct io_rsrc_node *node, void *rsrc) |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8372 | { |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 8373 | struct io_rsrc_put *prsrc; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8374 | |
Bijan Mottahedeh | 269bbe5 | 2021-01-15 17:37:44 +0000 | [diff] [blame] | 8375 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); |
| 8376 | if (!prsrc) |
Hillf Danton | a5318d3 | 2020-03-23 17:47:15 +0800 | [diff] [blame] | 8377 | return -ENOMEM; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8378 | |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 8379 | prsrc->tag = *io_get_tag_slot(data, idx); |
Bijan Mottahedeh | 5023853 | 2021-01-15 17:37:45 +0000 | [diff] [blame] | 8380 | prsrc->rsrc = rsrc; |
Pavel Begunkov | e7c7837 | 2021-04-01 15:43:45 +0100 | [diff] [blame] | 8381 | list_add(&prsrc->list, &node->rsrc_list); |
Hillf Danton | a5318d3 | 2020-03-23 17:47:15 +0800 | [diff] [blame] | 8382 | return 0; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8383 | } |
| 8384 | |
| 8385 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 8386 | struct io_uring_rsrc_update2 *up, |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8387 | unsigned nr_args) |
| 8388 | { |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 8389 | u64 __user *tags = u64_to_user_ptr(up->tags); |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 8390 | __s32 __user *fds = u64_to_user_ptr(up->data); |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 8391 | struct io_rsrc_data *data = ctx->file_data; |
Pavel Begunkov | a04b0ac | 2021-04-01 15:44:04 +0100 | [diff] [blame] | 8392 | struct io_fixed_file *file_slot; |
| 8393 | struct file *file; |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 8394 | int fd, i, err = 0; |
| 8395 | unsigned int done; |
Xiaoguang Wang | 0558955 | 2020-03-31 14:05:18 +0800 | [diff] [blame] | 8396 | bool needs_switch = false; |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8397 | |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 8398 | if (!ctx->file_data) |
| 8399 | return -ENXIO; |
| 8400 | if (up->offset + nr_args > ctx->nr_user_files) |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8401 | return -EINVAL; |
| 8402 | |
Pavel Begunkov | 67973b9 | 2021-01-26 13:51:09 +0000 | [diff] [blame] | 8403 | for (done = 0; done < nr_args; done++) { |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 8404 | u64 tag = 0; |
| 8405 | |
| 8406 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || |
| 8407 | copy_from_user(&fd, &fds[done], sizeof(fd))) { |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8408 | err = -EFAULT; |
| 8409 | break; |
| 8410 | } |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 8411 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
| 8412 | err = -EINVAL; |
| 8413 | break; |
| 8414 | } |
noah | 4e0377a | 2021-01-26 15:23:28 -0500 | [diff] [blame] | 8415 | if (fd == IORING_REGISTER_FILES_SKIP) |
| 8416 | continue; |
| 8417 | |
Pavel Begunkov | 67973b9 | 2021-01-26 13:51:09 +0000 | [diff] [blame] | 8418 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
Pavel Begunkov | aeca241 | 2021-04-11 01:46:37 +0100 | [diff] [blame] | 8419 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
Pavel Begunkov | ea64ec02 | 2021-02-04 13:52:07 +0000 | [diff] [blame] | 8420 | |
Pavel Begunkov | a04b0ac | 2021-04-01 15:44:04 +0100 | [diff] [blame] | 8421 | if (file_slot->file_ptr) { |
| 8422 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); |
Pavel Begunkov | b60c8dc | 2021-04-25 14:32:18 +0100 | [diff] [blame] | 8423 | err = io_queue_rsrc_removal(data, up->offset + done, |
| 8424 | ctx->rsrc_node, file); |
Hillf Danton | a5318d3 | 2020-03-23 17:47:15 +0800 | [diff] [blame] | 8425 | if (err) |
| 8426 | break; |
Pavel Begunkov | a04b0ac | 2021-04-01 15:44:04 +0100 | [diff] [blame] | 8427 | file_slot->file_ptr = 0; |
Xiaoguang Wang | 0558955 | 2020-03-31 14:05:18 +0800 | [diff] [blame] | 8428 | needs_switch = true; |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8429 | } |
| 8430 | if (fd != -1) { |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8431 | file = fget(fd); |
| 8432 | if (!file) { |
| 8433 | err = -EBADF; |
| 8434 | break; |
| 8435 | } |
| 8436 | /* |
| 8437 | * Don't allow io_uring instances to be registered. If |
| 8438 | * UNIX isn't enabled, then this causes a reference |
| 8439 | * cycle and this instance can never get freed. If UNIX |
| 8440 | * is enabled we'll handle it just fine, but there's |
| 8441 | * still no point in allowing a ring fd as it doesn't |
| 8442 | * support regular read/write anyway. |
| 8443 | */ |
| 8444 | if (file->f_op == &io_uring_fops) { |
| 8445 | fput(file); |
| 8446 | err = -EBADF; |
| 8447 | break; |
| 8448 | } |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 8449 | *io_get_tag_slot(data, up->offset + done) = tag; |
Pavel Begunkov | 9a321c9 | 2021-04-01 15:44:01 +0100 | [diff] [blame] | 8450 | io_fixed_file_set(file_slot, file); |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8451 | err = io_sqe_file_register(ctx, file, i); |
Yang Yingliang | f3bd9da | 2020-07-09 10:11:41 +0000 | [diff] [blame] | 8452 | if (err) { |
Pavel Begunkov | a04b0ac | 2021-04-01 15:44:04 +0100 | [diff] [blame] | 8453 | file_slot->file_ptr = 0; |
Yang Yingliang | f3bd9da | 2020-07-09 10:11:41 +0000 | [diff] [blame] | 8454 | fput(file); |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8455 | break; |
Yang Yingliang | f3bd9da | 2020-07-09 10:11:41 +0000 | [diff] [blame] | 8456 | } |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8457 | } |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 8458 | } |
| 8459 | |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 8460 | if (needs_switch) |
| 8461 | io_rsrc_node_switch(ctx, data); |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 8462 | return done ? done : err; |
| 8463 | } |
Xiaoguang Wang | 0558955 | 2020-03-31 14:05:18 +0800 | [diff] [blame] | 8464 | |
Jens Axboe | 685fe7f | 2021-03-08 09:37:51 -0700 | [diff] [blame] | 8465 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
| 8466 | struct task_struct *task) |
Pavel Begunkov | 24369c2 | 2020-01-28 03:15:48 +0300 | [diff] [blame] | 8467 | { |
Jens Axboe | e941894 | 2021-02-19 12:33:30 -0700 | [diff] [blame] | 8468 | struct io_wq_hash *hash; |
Pavel Begunkov | 24369c2 | 2020-01-28 03:15:48 +0300 | [diff] [blame] | 8469 | struct io_wq_data data; |
Pavel Begunkov | 24369c2 | 2020-01-28 03:15:48 +0300 | [diff] [blame] | 8470 | unsigned int concurrency; |
Pavel Begunkov | 24369c2 | 2020-01-28 03:15:48 +0300 | [diff] [blame] | 8471 | |
Yang Yingliang | 362a9e6 | 2021-07-20 16:38:05 +0800 | [diff] [blame] | 8472 | mutex_lock(&ctx->uring_lock); |
Jens Axboe | e941894 | 2021-02-19 12:33:30 -0700 | [diff] [blame] | 8473 | hash = ctx->hash_map; |
| 8474 | if (!hash) { |
| 8475 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); |
Yang Yingliang | 362a9e6 | 2021-07-20 16:38:05 +0800 | [diff] [blame] | 8476 | if (!hash) { |
| 8477 | mutex_unlock(&ctx->uring_lock); |
Jens Axboe | e941894 | 2021-02-19 12:33:30 -0700 | [diff] [blame] | 8478 | return ERR_PTR(-ENOMEM); |
Yang Yingliang | 362a9e6 | 2021-07-20 16:38:05 +0800 | [diff] [blame] | 8479 | } |
Jens Axboe | e941894 | 2021-02-19 12:33:30 -0700 | [diff] [blame] | 8480 | refcount_set(&hash->refs, 1); |
| 8481 | init_waitqueue_head(&hash->wait); |
| 8482 | ctx->hash_map = hash; |
| 8483 | } |
Yang Yingliang | 362a9e6 | 2021-07-20 16:38:05 +0800 | [diff] [blame] | 8484 | mutex_unlock(&ctx->uring_lock); |
Jens Axboe | e941894 | 2021-02-19 12:33:30 -0700 | [diff] [blame] | 8485 | |
| 8486 | data.hash = hash; |
Jens Axboe | 685fe7f | 2021-03-08 09:37:51 -0700 | [diff] [blame] | 8487 | data.task = task; |
Pavel Begunkov | ebc11b6 | 2021-08-09 13:04:05 +0100 | [diff] [blame] | 8488 | data.free_work = io_wq_free_work; |
Pavel Begunkov | f5fa38c | 2020-06-08 21:08:20 +0300 | [diff] [blame] | 8489 | data.do_work = io_wq_submit_work; |
Pavel Begunkov | 24369c2 | 2020-01-28 03:15:48 +0300 | [diff] [blame] | 8490 | |
Jens Axboe | d25e3a3 | 2021-02-16 11:41:41 -0700 | [diff] [blame] | 8491 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
| 8492 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); |
Pavel Begunkov | 24369c2 | 2020-01-28 03:15:48 +0300 | [diff] [blame] | 8493 | |
Jens Axboe | 5aa75ed | 2021-02-16 12:56:50 -0700 | [diff] [blame] | 8494 | return io_wq_create(concurrency, &data); |
Pavel Begunkov | 24369c2 | 2020-01-28 03:15:48 +0300 | [diff] [blame] | 8495 | } |
| 8496 | |
Jens Axboe | 5aa75ed | 2021-02-16 12:56:50 -0700 | [diff] [blame] | 8497 | static int io_uring_alloc_task_context(struct task_struct *task, |
| 8498 | struct io_ring_ctx *ctx) |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 8499 | { |
| 8500 | struct io_uring_task *tctx; |
Jens Axboe | d8a6df1 | 2020-10-15 16:24:45 -0600 | [diff] [blame] | 8501 | int ret; |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 8502 | |
Pavel Begunkov | 09899b1 | 2021-06-14 02:36:22 +0100 | [diff] [blame] | 8503 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 8504 | if (unlikely(!tctx)) |
| 8505 | return -ENOMEM; |
| 8506 | |
Jens Axboe | d8a6df1 | 2020-10-15 16:24:45 -0600 | [diff] [blame] | 8507 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
| 8508 | if (unlikely(ret)) { |
| 8509 | kfree(tctx); |
| 8510 | return ret; |
| 8511 | } |
| 8512 | |
Jens Axboe | 685fe7f | 2021-03-08 09:37:51 -0700 | [diff] [blame] | 8513 | tctx->io_wq = io_init_wq_offload(ctx, task); |
Jens Axboe | 5aa75ed | 2021-02-16 12:56:50 -0700 | [diff] [blame] | 8514 | if (IS_ERR(tctx->io_wq)) { |
| 8515 | ret = PTR_ERR(tctx->io_wq); |
| 8516 | percpu_counter_destroy(&tctx->inflight); |
| 8517 | kfree(tctx); |
| 8518 | return ret; |
| 8519 | } |
| 8520 | |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 8521 | xa_init(&tctx->xa); |
| 8522 | init_waitqueue_head(&tctx->wait); |
Jens Axboe | fdaf083 | 2020-10-30 09:37:30 -0600 | [diff] [blame] | 8523 | atomic_set(&tctx->in_idle, 0); |
Pavel Begunkov | b303fe2 | 2021-04-11 01:46:26 +0100 | [diff] [blame] | 8524 | atomic_set(&tctx->inflight_tracked, 0); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 8525 | task->io_uring = tctx; |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 8526 | spin_lock_init(&tctx->task_lock); |
| 8527 | INIT_WQ_LIST(&tctx->task_list); |
Jens Axboe | 7cbf172 | 2021-02-10 00:03:20 +0000 | [diff] [blame] | 8528 | init_task_work(&tctx->task_work, tctx_task_work); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 8529 | return 0; |
| 8530 | } |
| 8531 | |
| 8532 | void __io_uring_free(struct task_struct *tsk) |
| 8533 | { |
| 8534 | struct io_uring_task *tctx = tsk->io_uring; |
| 8535 | |
| 8536 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); |
Pavel Begunkov | ef8eaa4 | 2021-02-27 11:16:45 +0000 | [diff] [blame] | 8537 | WARN_ON_ONCE(tctx->io_wq); |
Pavel Begunkov | 09899b1 | 2021-06-14 02:36:22 +0100 | [diff] [blame] | 8538 | WARN_ON_ONCE(tctx->cached_refs); |
Pavel Begunkov | ef8eaa4 | 2021-02-27 11:16:45 +0000 | [diff] [blame] | 8539 | |
Jens Axboe | d8a6df1 | 2020-10-15 16:24:45 -0600 | [diff] [blame] | 8540 | percpu_counter_destroy(&tctx->inflight); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 8541 | kfree(tctx); |
| 8542 | tsk->io_uring = NULL; |
| 8543 | } |
| 8544 | |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 8545 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
| 8546 | struct io_uring_params *p) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 8547 | { |
| 8548 | int ret; |
| 8549 | |
Jens Axboe | d25e3a3 | 2021-02-16 11:41:41 -0700 | [diff] [blame] | 8550 | /* Retain compatibility with failing for an invalid attach attempt */ |
| 8551 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == |
| 8552 | IORING_SETUP_ATTACH_WQ) { |
| 8553 | struct fd f; |
| 8554 | |
| 8555 | f = fdget(p->wq_fd); |
| 8556 | if (!f.file) |
| 8557 | return -ENXIO; |
Jens Axboe | 0cc936f | 2021-07-22 17:08:07 -0600 | [diff] [blame] | 8558 | if (f.file->f_op != &io_uring_fops) { |
| 8559 | fdput(f); |
Pavel Begunkov | f2a48dd | 2021-04-20 12:03:33 +0100 | [diff] [blame] | 8560 | return -EINVAL; |
Jens Axboe | 0cc936f | 2021-07-22 17:08:07 -0600 | [diff] [blame] | 8561 | } |
| 8562 | fdput(f); |
Jens Axboe | d25e3a3 | 2021-02-16 11:41:41 -0700 | [diff] [blame] | 8563 | } |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 8564 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
Jens Axboe | 46fe18b | 2021-03-04 12:39:36 -0700 | [diff] [blame] | 8565 | struct task_struct *tsk; |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 8566 | struct io_sq_data *sqd; |
Pavel Begunkov | 26984fb | 2021-03-11 23:29:37 +0000 | [diff] [blame] | 8567 | bool attached; |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 8568 | |
Pavel Begunkov | 26984fb | 2021-03-11 23:29:37 +0000 | [diff] [blame] | 8569 | sqd = io_get_sq_data(p, &attached); |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 8570 | if (IS_ERR(sqd)) { |
| 8571 | ret = PTR_ERR(sqd); |
| 8572 | goto err; |
| 8573 | } |
Jens Axboe | 69fb213 | 2020-09-14 11:16:23 -0600 | [diff] [blame] | 8574 | |
Stefan Metzmacher | 7c30f36a | 2021-03-07 11:54:28 +0100 | [diff] [blame] | 8575 | ctx->sq_creds = get_current_cred(); |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 8576 | ctx->sq_data = sqd; |
Jens Axboe | 917257d | 2019-04-13 09:28:55 -0600 | [diff] [blame] | 8577 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
| 8578 | if (!ctx->sq_thread_idle) |
| 8579 | ctx->sq_thread_idle = HZ; |
| 8580 | |
Pavel Begunkov | 78d7f6b | 2021-03-10 13:13:53 +0000 | [diff] [blame] | 8581 | io_sq_thread_park(sqd); |
Pavel Begunkov | de75a3d | 2021-03-18 11:54:35 +0000 | [diff] [blame] | 8582 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
| 8583 | io_sqd_update_thread_idle(sqd); |
Pavel Begunkov | 26984fb | 2021-03-11 23:29:37 +0000 | [diff] [blame] | 8584 | /* don't attach to a dying SQPOLL thread, would be racy */ |
Pavel Begunkov | f2a48dd | 2021-04-20 12:03:33 +0100 | [diff] [blame] | 8585 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
Pavel Begunkov | 78d7f6b | 2021-03-10 13:13:53 +0000 | [diff] [blame] | 8586 | io_sq_thread_unpark(sqd); |
| 8587 | |
Pavel Begunkov | de75a3d | 2021-03-18 11:54:35 +0000 | [diff] [blame] | 8588 | if (ret < 0) |
| 8589 | goto err; |
| 8590 | if (attached) |
Jens Axboe | 5aa75ed | 2021-02-16 12:56:50 -0700 | [diff] [blame] | 8591 | return 0; |
Jens Axboe | aa06165 | 2020-09-02 14:50:27 -0600 | [diff] [blame] | 8592 | |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 8593 | if (p->flags & IORING_SETUP_SQ_AFF) { |
Jens Axboe | 44a9bd1 | 2019-05-14 20:00:30 -0600 | [diff] [blame] | 8594 | int cpu = p->sq_thread_cpu; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 8595 | |
Jens Axboe | 917257d | 2019-04-13 09:28:55 -0600 | [diff] [blame] | 8596 | ret = -EINVAL; |
Pavel Begunkov | f2a48dd | 2021-04-20 12:03:33 +0100 | [diff] [blame] | 8597 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
Jens Axboe | e8f98f24 | 2021-03-09 16:32:13 -0700 | [diff] [blame] | 8598 | goto err_sqpoll; |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 8599 | sqd->sq_cpu = cpu; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 8600 | } else { |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 8601 | sqd->sq_cpu = -1; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 8602 | } |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 8603 | |
| 8604 | sqd->task_pid = current->pid; |
Jens Axboe | 5c2469e | 2021-03-11 10:17:56 -0700 | [diff] [blame] | 8605 | sqd->task_tgid = current->tgid; |
Jens Axboe | 46fe18b | 2021-03-04 12:39:36 -0700 | [diff] [blame] | 8606 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
| 8607 | if (IS_ERR(tsk)) { |
| 8608 | ret = PTR_ERR(tsk); |
Jens Axboe | e8f98f24 | 2021-03-09 16:32:13 -0700 | [diff] [blame] | 8609 | goto err_sqpoll; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 8610 | } |
Pavel Begunkov | 97a73a0 | 2021-03-08 17:30:54 +0000 | [diff] [blame] | 8611 | |
Jens Axboe | 46fe18b | 2021-03-04 12:39:36 -0700 | [diff] [blame] | 8612 | sqd->thread = tsk; |
Pavel Begunkov | 97a73a0 | 2021-03-08 17:30:54 +0000 | [diff] [blame] | 8613 | ret = io_uring_alloc_task_context(tsk, ctx); |
Jens Axboe | 46fe18b | 2021-03-04 12:39:36 -0700 | [diff] [blame] | 8614 | wake_up_new_task(tsk); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 8615 | if (ret) |
| 8616 | goto err; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 8617 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
| 8618 | /* Can't have SQ_AFF without SQPOLL */ |
| 8619 | ret = -EINVAL; |
| 8620 | goto err; |
| 8621 | } |
| 8622 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 8623 | return 0; |
Pavel Begunkov | f2a48dd | 2021-04-20 12:03:33 +0100 | [diff] [blame] | 8624 | err_sqpoll: |
| 8625 | complete(&ctx->sq_data->exited); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 8626 | err: |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 8627 | io_sq_thread_finish(ctx); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 8628 | return ret; |
| 8629 | } |
| 8630 | |
Bijan Mottahedeh | a087e2b | 2020-06-16 16:36:07 -0700 | [diff] [blame] | 8631 | static inline void __io_unaccount_mem(struct user_struct *user, |
| 8632 | unsigned long nr_pages) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 8633 | { |
| 8634 | atomic_long_sub(nr_pages, &user->locked_vm); |
| 8635 | } |
| 8636 | |
Bijan Mottahedeh | a087e2b | 2020-06-16 16:36:07 -0700 | [diff] [blame] | 8637 | static inline int __io_account_mem(struct user_struct *user, |
| 8638 | unsigned long nr_pages) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 8639 | { |
| 8640 | unsigned long page_limit, cur_pages, new_pages; |
| 8641 | |
| 8642 | /* Don't allow more pages than we can safely lock */ |
| 8643 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
| 8644 | |
| 8645 | do { |
| 8646 | cur_pages = atomic_long_read(&user->locked_vm); |
| 8647 | new_pages = cur_pages + nr_pages; |
| 8648 | if (new_pages > page_limit) |
| 8649 | return -ENOMEM; |
| 8650 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, |
| 8651 | new_pages) != cur_pages); |
| 8652 | |
| 8653 | return 0; |
| 8654 | } |
| 8655 | |
Jens Axboe | 26bfa89e | 2021-02-09 20:14:12 -0700 | [diff] [blame] | 8656 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
Bijan Mottahedeh | a087e2b | 2020-06-16 16:36:07 -0700 | [diff] [blame] | 8657 | { |
Jens Axboe | 62e398b | 2021-02-21 16:19:37 -0700 | [diff] [blame] | 8658 | if (ctx->user) |
Bijan Mottahedeh | a087e2b | 2020-06-16 16:36:07 -0700 | [diff] [blame] | 8659 | __io_unaccount_mem(ctx->user, nr_pages); |
Bijan Mottahedeh | 3097582 | 2020-06-16 16:36:09 -0700 | [diff] [blame] | 8660 | |
Jens Axboe | 26bfa89e | 2021-02-09 20:14:12 -0700 | [diff] [blame] | 8661 | if (ctx->mm_account) |
| 8662 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); |
Bijan Mottahedeh | a087e2b | 2020-06-16 16:36:07 -0700 | [diff] [blame] | 8663 | } |
| 8664 | |
Jens Axboe | 26bfa89e | 2021-02-09 20:14:12 -0700 | [diff] [blame] | 8665 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
Bijan Mottahedeh | a087e2b | 2020-06-16 16:36:07 -0700 | [diff] [blame] | 8666 | { |
Bijan Mottahedeh | 3097582 | 2020-06-16 16:36:09 -0700 | [diff] [blame] | 8667 | int ret; |
| 8668 | |
Jens Axboe | 62e398b | 2021-02-21 16:19:37 -0700 | [diff] [blame] | 8669 | if (ctx->user) { |
Bijan Mottahedeh | 3097582 | 2020-06-16 16:36:09 -0700 | [diff] [blame] | 8670 | ret = __io_account_mem(ctx->user, nr_pages); |
| 8671 | if (ret) |
| 8672 | return ret; |
| 8673 | } |
| 8674 | |
Jens Axboe | 26bfa89e | 2021-02-09 20:14:12 -0700 | [diff] [blame] | 8675 | if (ctx->mm_account) |
| 8676 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); |
Bijan Mottahedeh | a087e2b | 2020-06-16 16:36:07 -0700 | [diff] [blame] | 8677 | |
| 8678 | return 0; |
| 8679 | } |
| 8680 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 8681 | static void io_mem_free(void *ptr) |
| 8682 | { |
Mark Rutland | 52e04ef | 2019-04-30 17:30:21 +0100 | [diff] [blame] | 8683 | struct page *page; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 8684 | |
Mark Rutland | 52e04ef | 2019-04-30 17:30:21 +0100 | [diff] [blame] | 8685 | if (!ptr) |
| 8686 | return; |
| 8687 | |
| 8688 | page = virt_to_head_page(ptr); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 8689 | if (put_page_testzero(page)) |
| 8690 | free_compound_page(page); |
| 8691 | } |
| 8692 | |
| 8693 | static void *io_mem_alloc(size_t size) |
| 8694 | { |
| 8695 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | |
Jens Axboe | 26bfa89e | 2021-02-09 20:14:12 -0700 | [diff] [blame] | 8696 | __GFP_NORETRY | __GFP_ACCOUNT; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 8697 | |
| 8698 | return (void *) __get_free_pages(gfp_flags, get_order(size)); |
| 8699 | } |
| 8700 | |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 8701 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
| 8702 | size_t *sq_offset) |
| 8703 | { |
| 8704 | struct io_rings *rings; |
| 8705 | size_t off, sq_array_size; |
| 8706 | |
| 8707 | off = struct_size(rings, cqes, cq_entries); |
| 8708 | if (off == SIZE_MAX) |
| 8709 | return SIZE_MAX; |
| 8710 | |
| 8711 | #ifdef CONFIG_SMP |
| 8712 | off = ALIGN(off, SMP_CACHE_BYTES); |
| 8713 | if (off == 0) |
| 8714 | return SIZE_MAX; |
| 8715 | #endif |
| 8716 | |
Dmitry Vyukov | b36200f | 2020-07-11 11:31:11 +0200 | [diff] [blame] | 8717 | if (sq_offset) |
| 8718 | *sq_offset = off; |
| 8719 | |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 8720 | sq_array_size = array_size(sizeof(u32), sq_entries); |
| 8721 | if (sq_array_size == SIZE_MAX) |
| 8722 | return SIZE_MAX; |
| 8723 | |
| 8724 | if (check_add_overflow(off, sq_array_size, &off)) |
| 8725 | return SIZE_MAX; |
| 8726 | |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 8727 | return off; |
| 8728 | } |
| 8729 | |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 8730 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
Pavel Begunkov | 7f61a1e9 | 2021-04-11 01:46:35 +0100 | [diff] [blame] | 8731 | { |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 8732 | struct io_mapped_ubuf *imu = *slot; |
Pavel Begunkov | 7f61a1e9 | 2021-04-11 01:46:35 +0100 | [diff] [blame] | 8733 | unsigned int i; |
| 8734 | |
Pavel Begunkov | 6224843 | 2021-04-28 13:11:29 +0100 | [diff] [blame] | 8735 | if (imu != ctx->dummy_ubuf) { |
| 8736 | for (i = 0; i < imu->nr_bvecs; i++) |
| 8737 | unpin_user_page(imu->bvec[i].bv_page); |
| 8738 | if (imu->acct_pages) |
| 8739 | io_unaccount_mem(ctx, imu->acct_pages); |
| 8740 | kvfree(imu); |
| 8741 | } |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 8742 | *slot = NULL; |
Pavel Begunkov | 7f61a1e9 | 2021-04-11 01:46:35 +0100 | [diff] [blame] | 8743 | } |
| 8744 | |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 8745 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
| 8746 | { |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 8747 | io_buffer_unmap(ctx, &prsrc->buf); |
| 8748 | prsrc->buf = NULL; |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 8749 | } |
| 8750 | |
| 8751 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8752 | { |
Pavel Begunkov | 7f61a1e9 | 2021-04-11 01:46:35 +0100 | [diff] [blame] | 8753 | unsigned int i; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8754 | |
Pavel Begunkov | 7f61a1e9 | 2021-04-11 01:46:35 +0100 | [diff] [blame] | 8755 | for (i = 0; i < ctx->nr_user_bufs; i++) |
| 8756 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8757 | kfree(ctx->user_bufs); |
Zqiang | bb6659c | 2021-04-30 16:25:15 +0800 | [diff] [blame] | 8758 | io_rsrc_data_free(ctx->buf_data); |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8759 | ctx->user_bufs = NULL; |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 8760 | ctx->buf_data = NULL; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8761 | ctx->nr_user_bufs = 0; |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 8762 | } |
| 8763 | |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8764 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
| 8765 | { |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 8766 | int ret; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8767 | |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 8768 | if (!ctx->buf_data) |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8769 | return -ENXIO; |
| 8770 | |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 8771 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
| 8772 | if (!ret) |
| 8773 | __io_sqe_buffers_unregister(ctx); |
| 8774 | return ret; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8775 | } |
| 8776 | |
| 8777 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, |
| 8778 | void __user *arg, unsigned index) |
| 8779 | { |
| 8780 | struct iovec __user *src; |
| 8781 | |
| 8782 | #ifdef CONFIG_COMPAT |
| 8783 | if (ctx->compat) { |
| 8784 | struct compat_iovec __user *ciovs; |
| 8785 | struct compat_iovec ciov; |
| 8786 | |
| 8787 | ciovs = (struct compat_iovec __user *) arg; |
| 8788 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) |
| 8789 | return -EFAULT; |
| 8790 | |
Jens Axboe | d55e5f5 | 2019-12-11 16:12:15 -0700 | [diff] [blame] | 8791 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8792 | dst->iov_len = ciov.iov_len; |
| 8793 | return 0; |
| 8794 | } |
| 8795 | #endif |
| 8796 | src = (struct iovec __user *) arg; |
| 8797 | if (copy_from_user(dst, &src[index], sizeof(*dst))) |
| 8798 | return -EFAULT; |
| 8799 | return 0; |
| 8800 | } |
| 8801 | |
Jens Axboe | de29393 | 2020-09-17 16:19:16 -0600 | [diff] [blame] | 8802 | /* |
| 8803 | * Not super efficient, but this is just a registration time. And we do cache |
| 8804 | * the last compound head, so generally we'll only do a full search if we don't |
| 8805 | * match that one. |
| 8806 | * |
| 8807 | * We check if the given compound head page has already been accounted, to |
| 8808 | * avoid double accounting it. This allows us to account the full size of the |
| 8809 | * page, not just the constituent pages of a huge page. |
| 8810 | */ |
| 8811 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, |
| 8812 | int nr_pages, struct page *hpage) |
| 8813 | { |
| 8814 | int i, j; |
| 8815 | |
| 8816 | /* check current page array */ |
| 8817 | for (i = 0; i < nr_pages; i++) { |
| 8818 | if (!PageCompound(pages[i])) |
| 8819 | continue; |
| 8820 | if (compound_head(pages[i]) == hpage) |
| 8821 | return true; |
| 8822 | } |
| 8823 | |
| 8824 | /* check previously registered pages */ |
| 8825 | for (i = 0; i < ctx->nr_user_bufs; i++) { |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 8826 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
Jens Axboe | de29393 | 2020-09-17 16:19:16 -0600 | [diff] [blame] | 8827 | |
| 8828 | for (j = 0; j < imu->nr_bvecs; j++) { |
| 8829 | if (!PageCompound(imu->bvec[j].bv_page)) |
| 8830 | continue; |
| 8831 | if (compound_head(imu->bvec[j].bv_page) == hpage) |
| 8832 | return true; |
| 8833 | } |
| 8834 | } |
| 8835 | |
| 8836 | return false; |
| 8837 | } |
| 8838 | |
| 8839 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, |
| 8840 | int nr_pages, struct io_mapped_ubuf *imu, |
| 8841 | struct page **last_hpage) |
| 8842 | { |
| 8843 | int i, ret; |
| 8844 | |
Pavel Begunkov | 216e583 | 2021-05-29 12:01:02 +0100 | [diff] [blame] | 8845 | imu->acct_pages = 0; |
Jens Axboe | de29393 | 2020-09-17 16:19:16 -0600 | [diff] [blame] | 8846 | for (i = 0; i < nr_pages; i++) { |
| 8847 | if (!PageCompound(pages[i])) { |
| 8848 | imu->acct_pages++; |
| 8849 | } else { |
| 8850 | struct page *hpage; |
| 8851 | |
| 8852 | hpage = compound_head(pages[i]); |
| 8853 | if (hpage == *last_hpage) |
| 8854 | continue; |
| 8855 | *last_hpage = hpage; |
| 8856 | if (headpage_already_acct(ctx, pages, i, hpage)) |
| 8857 | continue; |
| 8858 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; |
| 8859 | } |
| 8860 | } |
| 8861 | |
| 8862 | if (!imu->acct_pages) |
| 8863 | return 0; |
| 8864 | |
Jens Axboe | 26bfa89e | 2021-02-09 20:14:12 -0700 | [diff] [blame] | 8865 | ret = io_account_mem(ctx, imu->acct_pages); |
Jens Axboe | de29393 | 2020-09-17 16:19:16 -0600 | [diff] [blame] | 8866 | if (ret) |
| 8867 | imu->acct_pages = 0; |
| 8868 | return ret; |
| 8869 | } |
| 8870 | |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8871 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 8872 | struct io_mapped_ubuf **pimu, |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8873 | struct page **last_hpage) |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8874 | { |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 8875 | struct io_mapped_ubuf *imu = NULL; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8876 | struct vm_area_struct **vmas = NULL; |
| 8877 | struct page **pages = NULL; |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8878 | unsigned long off, start, end, ubuf; |
| 8879 | size_t size; |
| 8880 | int ret, pret, nr_pages, i; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 8881 | |
Pavel Begunkov | 6224843 | 2021-04-28 13:11:29 +0100 | [diff] [blame] | 8882 | if (!iov->iov_base) { |
| 8883 | *pimu = ctx->dummy_ubuf; |
| 8884 | return 0; |
| 8885 | } |
| 8886 | |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8887 | ubuf = (unsigned long) iov->iov_base; |
| 8888 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 8889 | start = ubuf >> PAGE_SHIFT; |
| 8890 | nr_pages = end - start; |
| 8891 | |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 8892 | *pimu = NULL; |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8893 | ret = -ENOMEM; |
| 8894 | |
| 8895 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); |
| 8896 | if (!pages) |
| 8897 | goto done; |
| 8898 | |
| 8899 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), |
| 8900 | GFP_KERNEL); |
| 8901 | if (!vmas) |
| 8902 | goto done; |
| 8903 | |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 8904 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
Pavel Begunkov | a2b4198 | 2021-04-26 00:16:31 +0100 | [diff] [blame] | 8905 | if (!imu) |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8906 | goto done; |
| 8907 | |
| 8908 | ret = 0; |
| 8909 | mmap_read_lock(current->mm); |
| 8910 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, |
| 8911 | pages, vmas); |
| 8912 | if (pret == nr_pages) { |
| 8913 | /* don't support file backed memory */ |
| 8914 | for (i = 0; i < nr_pages; i++) { |
| 8915 | struct vm_area_struct *vma = vmas[i]; |
| 8916 | |
Pavel Begunkov | 40dad76 | 2021-06-09 15:26:54 +0100 | [diff] [blame] | 8917 | if (vma_is_shmem(vma)) |
| 8918 | continue; |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8919 | if (vma->vm_file && |
| 8920 | !is_file_hugepages(vma->vm_file)) { |
| 8921 | ret = -EOPNOTSUPP; |
| 8922 | break; |
| 8923 | } |
| 8924 | } |
| 8925 | } else { |
| 8926 | ret = pret < 0 ? pret : -EFAULT; |
| 8927 | } |
| 8928 | mmap_read_unlock(current->mm); |
| 8929 | if (ret) { |
| 8930 | /* |
| 8931 | * if we did partial map, or found file backed vmas, |
| 8932 | * release any pages we did get |
| 8933 | */ |
| 8934 | if (pret > 0) |
| 8935 | unpin_user_pages(pages, pret); |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8936 | goto done; |
| 8937 | } |
| 8938 | |
| 8939 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); |
| 8940 | if (ret) { |
| 8941 | unpin_user_pages(pages, pret); |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8942 | goto done; |
| 8943 | } |
| 8944 | |
| 8945 | off = ubuf & ~PAGE_MASK; |
| 8946 | size = iov->iov_len; |
| 8947 | for (i = 0; i < nr_pages; i++) { |
| 8948 | size_t vec_len; |
| 8949 | |
| 8950 | vec_len = min_t(size_t, size, PAGE_SIZE - off); |
| 8951 | imu->bvec[i].bv_page = pages[i]; |
| 8952 | imu->bvec[i].bv_len = vec_len; |
| 8953 | imu->bvec[i].bv_offset = off; |
| 8954 | off = 0; |
| 8955 | size -= vec_len; |
| 8956 | } |
| 8957 | /* store original address for later verification */ |
| 8958 | imu->ubuf = ubuf; |
Pavel Begunkov | 4751f53 | 2021-04-01 15:43:55 +0100 | [diff] [blame] | 8959 | imu->ubuf_end = ubuf + iov->iov_len; |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8960 | imu->nr_bvecs = nr_pages; |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 8961 | *pimu = imu; |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8962 | ret = 0; |
| 8963 | done: |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 8964 | if (ret) |
| 8965 | kvfree(imu); |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8966 | kvfree(pages); |
| 8967 | kvfree(vmas); |
| 8968 | return ret; |
| 8969 | } |
| 8970 | |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 8971 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 8972 | { |
Pavel Begunkov | 8709446 | 2021-04-11 01:46:36 +0100 | [diff] [blame] | 8973 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
| 8974 | return ctx->user_bufs ? 0 : -ENOMEM; |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 8975 | } |
| 8976 | |
| 8977 | static int io_buffer_validate(struct iovec *iov) |
| 8978 | { |
Pavel Begunkov | 50e9698 | 2021-03-24 22:59:01 +0000 | [diff] [blame] | 8979 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
| 8980 | |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 8981 | /* |
| 8982 | * Don't impose further limits on the size and buffer |
| 8983 | * constraints here, we'll -EINVAL later when IO is |
| 8984 | * submitted if they are wrong. |
| 8985 | */ |
Pavel Begunkov | 6224843 | 2021-04-28 13:11:29 +0100 | [diff] [blame] | 8986 | if (!iov->iov_base) |
| 8987 | return iov->iov_len ? -EFAULT : 0; |
| 8988 | if (!iov->iov_len) |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 8989 | return -EFAULT; |
| 8990 | |
| 8991 | /* arbitrary limit, but we need something */ |
| 8992 | if (iov->iov_len > SZ_1G) |
| 8993 | return -EFAULT; |
| 8994 | |
Pavel Begunkov | 50e9698 | 2021-03-24 22:59:01 +0000 | [diff] [blame] | 8995 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
| 8996 | return -EOVERFLOW; |
| 8997 | |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 8998 | return 0; |
| 8999 | } |
| 9000 | |
| 9001 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 9002 | unsigned int nr_args, u64 __user *tags) |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 9003 | { |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 9004 | struct page *last_hpage = NULL; |
| 9005 | struct io_rsrc_data *data; |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 9006 | int i, ret; |
| 9007 | struct iovec iov; |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 9008 | |
Pavel Begunkov | 8709446 | 2021-04-11 01:46:36 +0100 | [diff] [blame] | 9009 | if (ctx->user_bufs) |
| 9010 | return -EBUSY; |
Pavel Begunkov | 489809e | 2021-05-14 12:06:44 +0100 | [diff] [blame] | 9011 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
Pavel Begunkov | 8709446 | 2021-04-11 01:46:36 +0100 | [diff] [blame] | 9012 | return -EINVAL; |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 9013 | ret = io_rsrc_node_switch_start(ctx); |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 9014 | if (ret) |
| 9015 | return ret; |
Pavel Begunkov | d878c81 | 2021-06-14 02:36:18 +0100 | [diff] [blame] | 9016 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
| 9017 | if (ret) |
| 9018 | return ret; |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 9019 | ret = io_buffers_map_alloc(ctx, nr_args); |
| 9020 | if (ret) { |
Zqiang | bb6659c | 2021-04-30 16:25:15 +0800 | [diff] [blame] | 9021 | io_rsrc_data_free(data); |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 9022 | return ret; |
| 9023 | } |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 9024 | |
Pavel Begunkov | 8709446 | 2021-04-11 01:46:36 +0100 | [diff] [blame] | 9025 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 9026 | ret = io_copy_iov(ctx, &iov, arg, i); |
| 9027 | if (ret) |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 9028 | break; |
Bijan Mottahedeh | 2b35860 | 2021-01-06 12:39:11 -0800 | [diff] [blame] | 9029 | ret = io_buffer_validate(&iov); |
| 9030 | if (ret) |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 9031 | break; |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 9032 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
Colin Ian King | cf3770e | 2021-04-29 11:46:02 +0100 | [diff] [blame] | 9033 | ret = -EINVAL; |
| 9034 | break; |
| 9035 | } |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 9036 | |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 9037 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
| 9038 | &last_hpage); |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 9039 | if (ret) |
| 9040 | break; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 9041 | } |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 9042 | |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 9043 | WARN_ON_ONCE(ctx->buf_data); |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 9044 | |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 9045 | ctx->buf_data = data; |
| 9046 | if (ret) |
| 9047 | __io_sqe_buffers_unregister(ctx); |
| 9048 | else |
| 9049 | io_rsrc_node_switch(ctx, NULL); |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 9050 | return ret; |
| 9051 | } |
| 9052 | |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 9053 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
| 9054 | struct io_uring_rsrc_update2 *up, |
| 9055 | unsigned int nr_args) |
| 9056 | { |
| 9057 | u64 __user *tags = u64_to_user_ptr(up->tags); |
| 9058 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 9059 | struct page *last_hpage = NULL; |
| 9060 | bool needs_switch = false; |
| 9061 | __u32 done; |
| 9062 | int i, err; |
| 9063 | |
| 9064 | if (!ctx->buf_data) |
| 9065 | return -ENXIO; |
| 9066 | if (up->offset + nr_args > ctx->nr_user_bufs) |
| 9067 | return -EINVAL; |
| 9068 | |
| 9069 | for (done = 0; done < nr_args; done++) { |
Pavel Begunkov | 0b8c0e7 | 2021-04-26 15:17:38 +0100 | [diff] [blame] | 9070 | struct io_mapped_ubuf *imu; |
| 9071 | int offset = up->offset + done; |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 9072 | u64 tag = 0; |
| 9073 | |
| 9074 | err = io_copy_iov(ctx, &iov, iovs, done); |
| 9075 | if (err) |
| 9076 | break; |
| 9077 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { |
| 9078 | err = -EFAULT; |
| 9079 | break; |
| 9080 | } |
Pavel Begunkov | 0b8c0e7 | 2021-04-26 15:17:38 +0100 | [diff] [blame] | 9081 | err = io_buffer_validate(&iov); |
| 9082 | if (err) |
| 9083 | break; |
Colin Ian King | cf3770e | 2021-04-29 11:46:02 +0100 | [diff] [blame] | 9084 | if (!iov.iov_base && tag) { |
| 9085 | err = -EINVAL; |
| 9086 | break; |
| 9087 | } |
Pavel Begunkov | 0b8c0e7 | 2021-04-26 15:17:38 +0100 | [diff] [blame] | 9088 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
| 9089 | if (err) |
| 9090 | break; |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 9091 | |
Pavel Begunkov | 0b8c0e7 | 2021-04-26 15:17:38 +0100 | [diff] [blame] | 9092 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
Pavel Begunkov | 6224843 | 2021-04-28 13:11:29 +0100 | [diff] [blame] | 9093 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
Pavel Begunkov | 0b8c0e7 | 2021-04-26 15:17:38 +0100 | [diff] [blame] | 9094 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
| 9095 | ctx->rsrc_node, ctx->user_bufs[i]); |
| 9096 | if (unlikely(err)) { |
| 9097 | io_buffer_unmap(ctx, &imu); |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 9098 | break; |
Pavel Begunkov | 0b8c0e7 | 2021-04-26 15:17:38 +0100 | [diff] [blame] | 9099 | } |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 9100 | ctx->user_bufs[i] = NULL; |
| 9101 | needs_switch = true; |
| 9102 | } |
| 9103 | |
Pavel Begunkov | 0b8c0e7 | 2021-04-26 15:17:38 +0100 | [diff] [blame] | 9104 | ctx->user_bufs[i] = imu; |
Pavel Begunkov | 2d091d6 | 2021-06-14 02:36:21 +0100 | [diff] [blame] | 9105 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 9106 | } |
| 9107 | |
| 9108 | if (needs_switch) |
| 9109 | io_rsrc_node_switch(ctx, ctx->buf_data); |
| 9110 | return done ? done : err; |
| 9111 | } |
| 9112 | |
Jens Axboe | 9b40284 | 2019-04-11 11:45:41 -0600 | [diff] [blame] | 9113 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
| 9114 | { |
| 9115 | __s32 __user *fds = arg; |
| 9116 | int fd; |
| 9117 | |
| 9118 | if (ctx->cq_ev_fd) |
| 9119 | return -EBUSY; |
| 9120 | |
| 9121 | if (copy_from_user(&fd, fds, sizeof(*fds))) |
| 9122 | return -EFAULT; |
| 9123 | |
| 9124 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); |
| 9125 | if (IS_ERR(ctx->cq_ev_fd)) { |
| 9126 | int ret = PTR_ERR(ctx->cq_ev_fd); |
Pavel Begunkov | fe7e325 | 2021-06-24 15:09:57 +0100 | [diff] [blame] | 9127 | |
Jens Axboe | 9b40284 | 2019-04-11 11:45:41 -0600 | [diff] [blame] | 9128 | ctx->cq_ev_fd = NULL; |
| 9129 | return ret; |
| 9130 | } |
| 9131 | |
| 9132 | return 0; |
| 9133 | } |
| 9134 | |
| 9135 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) |
| 9136 | { |
| 9137 | if (ctx->cq_ev_fd) { |
| 9138 | eventfd_ctx_put(ctx->cq_ev_fd); |
| 9139 | ctx->cq_ev_fd = NULL; |
| 9140 | return 0; |
| 9141 | } |
| 9142 | |
| 9143 | return -ENXIO; |
| 9144 | } |
| 9145 | |
Jens Axboe | 5a2e745 | 2020-02-23 16:23:11 -0700 | [diff] [blame] | 9146 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
| 9147 | { |
Jens Axboe | 9e15c3a | 2021-03-13 12:29:43 -0700 | [diff] [blame] | 9148 | struct io_buffer *buf; |
| 9149 | unsigned long index; |
| 9150 | |
| 9151 | xa_for_each(&ctx->io_buffers, index, buf) |
| 9152 | __io_remove_buffers(ctx, buf, index, -1U); |
Jens Axboe | 5a2e745 | 2020-02-23 16:23:11 -0700 | [diff] [blame] | 9153 | } |
| 9154 | |
Pavel Begunkov | 7255834 | 2021-08-09 20:18:09 +0100 | [diff] [blame] | 9155 | static void io_req_cache_free(struct list_head *list) |
Jens Axboe | 1b4c351 | 2021-02-10 00:03:19 +0000 | [diff] [blame] | 9156 | { |
Jens Axboe | 68e68ee | 2021-02-13 09:00:02 -0700 | [diff] [blame] | 9157 | struct io_kiocb *req, *nxt; |
Jens Axboe | 1b4c351 | 2021-02-10 00:03:19 +0000 | [diff] [blame] | 9158 | |
Pavel Begunkov | bb943b8 | 2021-08-09 20:18:10 +0100 | [diff] [blame] | 9159 | list_for_each_entry_safe(req, nxt, list, inflight_entry) { |
| 9160 | list_del(&req->inflight_entry); |
Jens Axboe | 1b4c351 | 2021-02-10 00:03:19 +0000 | [diff] [blame] | 9161 | kmem_cache_free(req_cachep, req); |
| 9162 | } |
| 9163 | } |
| 9164 | |
Jens Axboe | 4010fec | 2021-02-27 15:04:18 -0700 | [diff] [blame] | 9165 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9166 | { |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 9167 | struct io_submit_state *state = &ctx->submit_state; |
Pavel Begunkov | bf019da | 2021-02-10 00:03:17 +0000 | [diff] [blame] | 9168 | |
Jens Axboe | 9a4fdbd | 2021-02-13 09:09:44 -0700 | [diff] [blame] | 9169 | mutex_lock(&ctx->uring_lock); |
| 9170 | |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 9171 | if (state->free_reqs) { |
| 9172 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
| 9173 | state->free_reqs = 0; |
Pavel Begunkov | 8e5c66c | 2021-02-22 11:45:55 +0000 | [diff] [blame] | 9174 | } |
Jens Axboe | 9a4fdbd | 2021-02-13 09:09:44 -0700 | [diff] [blame] | 9175 | |
Pavel Begunkov | cd0ca2e | 2021-08-09 20:18:11 +0100 | [diff] [blame] | 9176 | io_flush_cached_locked_reqs(ctx, state); |
| 9177 | io_req_cache_free(&state->free_list); |
Jens Axboe | 9a4fdbd | 2021-02-13 09:09:44 -0700 | [diff] [blame] | 9178 | mutex_unlock(&ctx->uring_lock); |
| 9179 | } |
| 9180 | |
Pavel Begunkov | 43597aa | 2021-08-10 02:44:23 +0100 | [diff] [blame] | 9181 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 9182 | { |
Pavel Begunkov | 43597aa | 2021-08-10 02:44:23 +0100 | [diff] [blame] | 9183 | if (data && !atomic_dec_and_test(&data->refs)) |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 9184 | wait_for_completion(&data->done); |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 9185 | } |
| 9186 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9187 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
| 9188 | { |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 9189 | io_sq_thread_finish(ctx); |
Jens Axboe | 2aede0e | 2020-09-14 10:45:53 -0600 | [diff] [blame] | 9190 | |
Jens Axboe | 37d1e2e | 2021-02-17 21:03:43 -0700 | [diff] [blame] | 9191 | if (ctx->mm_account) { |
Jens Axboe | 2aede0e | 2020-09-14 10:45:53 -0600 | [diff] [blame] | 9192 | mmdrop(ctx->mm_account); |
| 9193 | ctx->mm_account = NULL; |
Bijan Mottahedeh | 3097582 | 2020-06-16 16:36:09 -0700 | [diff] [blame] | 9194 | } |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 9195 | |
Pavel Begunkov | 43597aa | 2021-08-10 02:44:23 +0100 | [diff] [blame] | 9196 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
| 9197 | io_wait_rsrc_data(ctx->buf_data); |
| 9198 | io_wait_rsrc_data(ctx->file_data); |
| 9199 | |
Hao Xu | 8bad28d | 2021-02-19 17:19:36 +0800 | [diff] [blame] | 9200 | mutex_lock(&ctx->uring_lock); |
Pavel Begunkov | 43597aa | 2021-08-10 02:44:23 +0100 | [diff] [blame] | 9201 | if (ctx->buf_data) |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 9202 | __io_sqe_buffers_unregister(ctx); |
Pavel Begunkov | 43597aa | 2021-08-10 02:44:23 +0100 | [diff] [blame] | 9203 | if (ctx->file_data) |
Pavel Begunkov | 0848040 | 2021-04-13 02:58:38 +0100 | [diff] [blame] | 9204 | __io_sqe_files_unregister(ctx); |
Pavel Begunkov | c4ea060 | 2021-04-01 15:43:58 +0100 | [diff] [blame] | 9205 | if (ctx->rings) |
| 9206 | __io_cqring_overflow_flush(ctx, true); |
Hao Xu | 8bad28d | 2021-02-19 17:19:36 +0800 | [diff] [blame] | 9207 | mutex_unlock(&ctx->uring_lock); |
Jens Axboe | 9b40284 | 2019-04-11 11:45:41 -0600 | [diff] [blame] | 9208 | io_eventfd_unregister(ctx); |
Jens Axboe | 5a2e745 | 2020-02-23 16:23:11 -0700 | [diff] [blame] | 9209 | io_destroy_buffers(ctx); |
Pavel Begunkov | 07db298 | 2021-04-20 12:03:32 +0100 | [diff] [blame] | 9210 | if (ctx->sq_creds) |
| 9211 | put_cred(ctx->sq_creds); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 9212 | |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 9213 | /* there are no registered resources left, nobody uses it */ |
| 9214 | if (ctx->rsrc_node) |
| 9215 | io_rsrc_node_destroy(ctx->rsrc_node); |
Pavel Begunkov | 8dd03af | 2021-03-19 17:22:36 +0000 | [diff] [blame] | 9216 | if (ctx->rsrc_backup_node) |
Pavel Begunkov | b895c9a | 2021-04-01 15:43:40 +0100 | [diff] [blame] | 9217 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
Pavel Begunkov | a7f0ed5 | 2021-04-01 15:43:46 +0100 | [diff] [blame] | 9218 | flush_delayed_work(&ctx->rsrc_put_work); |
| 9219 | |
| 9220 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); |
| 9221 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9222 | |
| 9223 | #if defined(CONFIG_UNIX) |
Eric Biggers | 355e8d26 | 2019-06-12 14:58:43 -0700 | [diff] [blame] | 9224 | if (ctx->ring_sock) { |
| 9225 | ctx->ring_sock->file = NULL; /* so that iput() is called */ |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9226 | sock_release(ctx->ring_sock); |
Eric Biggers | 355e8d26 | 2019-06-12 14:58:43 -0700 | [diff] [blame] | 9227 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9228 | #endif |
Pavel Begunkov | ef9dd63 | 2021-08-28 19:54:38 -0600 | [diff] [blame] | 9229 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9230 | |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 9231 | io_mem_free(ctx->rings); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9232 | io_mem_free(ctx->sq_sqes); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9233 | |
| 9234 | percpu_ref_exit(&ctx->refs); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9235 | free_uid(ctx->user); |
Jens Axboe | 4010fec | 2021-02-27 15:04:18 -0700 | [diff] [blame] | 9236 | io_req_caches_free(ctx); |
Jens Axboe | e941894 | 2021-02-19 12:33:30 -0700 | [diff] [blame] | 9237 | if (ctx->hash_map) |
| 9238 | io_wq_put_hash(ctx->hash_map); |
Jens Axboe | 78076bb | 2019-12-04 19:56:40 -0700 | [diff] [blame] | 9239 | kfree(ctx->cancel_hash); |
Pavel Begunkov | 6224843 | 2021-04-28 13:11:29 +0100 | [diff] [blame] | 9240 | kfree(ctx->dummy_ubuf); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9241 | kfree(ctx); |
| 9242 | } |
| 9243 | |
| 9244 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) |
| 9245 | { |
| 9246 | struct io_ring_ctx *ctx = file->private_data; |
| 9247 | __poll_t mask = 0; |
| 9248 | |
Pavel Begunkov | 311997b | 2021-06-14 23:37:28 +0100 | [diff] [blame] | 9249 | poll_wait(file, &ctx->poll_wait, wait); |
Stefan Bühler | 4f7067c | 2019-04-24 23:54:17 +0200 | [diff] [blame] | 9250 | /* |
| 9251 | * synchronizes with barrier from wq_has_sleeper call in |
| 9252 | * io_commit_cqring |
| 9253 | */ |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9254 | smp_rmb(); |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 9255 | if (!io_sqring_full(ctx)) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9256 | mask |= EPOLLOUT | EPOLLWRNORM; |
Hao Xu | ed670c3 | 2021-02-05 16:34:21 +0800 | [diff] [blame] | 9257 | |
| 9258 | /* |
| 9259 | * Don't flush cqring overflow list here, just do a simple check. |
| 9260 | * Otherwise there could possible be ABBA deadlock: |
| 9261 | * CPU0 CPU1 |
| 9262 | * ---- ---- |
| 9263 | * lock(&ctx->uring_lock); |
| 9264 | * lock(&ep->mtx); |
| 9265 | * lock(&ctx->uring_lock); |
| 9266 | * lock(&ep->mtx); |
| 9267 | * |
| 9268 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this |
| 9269 | * pushs them to do the flush. |
| 9270 | */ |
Pavel Begunkov | 5ed7a37 | 2021-06-14 23:37:27 +0100 | [diff] [blame] | 9271 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9272 | mask |= EPOLLIN | EPOLLRDNORM; |
| 9273 | |
| 9274 | return mask; |
| 9275 | } |
| 9276 | |
| 9277 | static int io_uring_fasync(int fd, struct file *file, int on) |
| 9278 | { |
| 9279 | struct io_ring_ctx *ctx = file->private_data; |
| 9280 | |
| 9281 | return fasync_helper(fd, file, on, &ctx->cq_fasync); |
| 9282 | } |
| 9283 | |
Yejune Deng | 0bead8c | 2020-12-24 11:02:20 +0800 | [diff] [blame] | 9284 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 9285 | { |
Jens Axboe | 4379bf8 | 2021-02-15 13:40:22 -0700 | [diff] [blame] | 9286 | const struct cred *creds; |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 9287 | |
Matthew Wilcox (Oracle) | 61cf937 | 2021-03-08 14:16:16 +0000 | [diff] [blame] | 9288 | creds = xa_erase(&ctx->personalities, id); |
Jens Axboe | 4379bf8 | 2021-02-15 13:40:22 -0700 | [diff] [blame] | 9289 | if (creds) { |
| 9290 | put_cred(creds); |
Yejune Deng | 0bead8c | 2020-12-24 11:02:20 +0800 | [diff] [blame] | 9291 | return 0; |
Jens Axboe | 1e6fa52 | 2020-10-15 08:46:24 -0600 | [diff] [blame] | 9292 | } |
Yejune Deng | 0bead8c | 2020-12-24 11:02:20 +0800 | [diff] [blame] | 9293 | |
| 9294 | return -EINVAL; |
| 9295 | } |
| 9296 | |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9297 | struct io_tctx_exit { |
| 9298 | struct callback_head task_work; |
| 9299 | struct completion completion; |
Pavel Begunkov | baf186c | 2021-03-06 11:02:15 +0000 | [diff] [blame] | 9300 | struct io_ring_ctx *ctx; |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9301 | }; |
| 9302 | |
| 9303 | static void io_tctx_exit_cb(struct callback_head *cb) |
| 9304 | { |
| 9305 | struct io_uring_task *tctx = current->io_uring; |
| 9306 | struct io_tctx_exit *work; |
| 9307 | |
| 9308 | work = container_of(cb, struct io_tctx_exit, task_work); |
| 9309 | /* |
| 9310 | * When @in_idle, we're in cancellation and it's racy to remove the |
| 9311 | * node. It'll be removed by the end of cancellation, just ignore it. |
| 9312 | */ |
| 9313 | if (!atomic_read(&tctx->in_idle)) |
Pavel Begunkov | eef51da | 2021-06-14 02:36:15 +0100 | [diff] [blame] | 9314 | io_uring_del_tctx_node((unsigned long)work->ctx); |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9315 | complete(&work->completion); |
| 9316 | } |
| 9317 | |
Pavel Begunkov | 28090c1 | 2021-04-25 23:34:45 +0100 | [diff] [blame] | 9318 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
| 9319 | { |
| 9320 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
| 9321 | |
| 9322 | return req->ctx == data; |
| 9323 | } |
| 9324 | |
Jens Axboe | 85faa7b | 2020-04-09 18:14:00 -0600 | [diff] [blame] | 9325 | static void io_ring_exit_work(struct work_struct *work) |
| 9326 | { |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9327 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
Pavel Begunkov | b5bb3a2 | 2021-03-06 11:02:16 +0000 | [diff] [blame] | 9328 | unsigned long timeout = jiffies + HZ * 60 * 5; |
Pavel Begunkov | 58d3be2 | 2021-08-09 13:04:17 +0100 | [diff] [blame] | 9329 | unsigned long interval = HZ / 20; |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9330 | struct io_tctx_exit exit; |
| 9331 | struct io_tctx_node *node; |
| 9332 | int ret; |
Jens Axboe | 85faa7b | 2020-04-09 18:14:00 -0600 | [diff] [blame] | 9333 | |
Jens Axboe | 56952e9 | 2020-06-17 15:00:04 -0600 | [diff] [blame] | 9334 | /* |
| 9335 | * If we're doing polled IO and end up having requests being |
| 9336 | * submitted async (out-of-line), then completions can come in while |
| 9337 | * we're waiting for refs to drop. We need to reap these manually, |
| 9338 | * as nobody else will be looking for them. |
| 9339 | */ |
Pavel Begunkov | b2edc0a | 2020-07-07 16:36:22 +0300 | [diff] [blame] | 9340 | do { |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9341 | io_uring_try_cancel_requests(ctx, NULL, true); |
Pavel Begunkov | 28090c1 | 2021-04-25 23:34:45 +0100 | [diff] [blame] | 9342 | if (ctx->sq_data) { |
| 9343 | struct io_sq_data *sqd = ctx->sq_data; |
| 9344 | struct task_struct *tsk; |
| 9345 | |
| 9346 | io_sq_thread_park(sqd); |
| 9347 | tsk = sqd->thread; |
| 9348 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) |
| 9349 | io_wq_cancel_cb(tsk->io_uring->io_wq, |
| 9350 | io_cancel_ctx_cb, ctx, true); |
| 9351 | io_sq_thread_unpark(sqd); |
| 9352 | } |
Pavel Begunkov | b5bb3a2 | 2021-03-06 11:02:16 +0000 | [diff] [blame] | 9353 | |
Pavel Begunkov | 58d3be2 | 2021-08-09 13:04:17 +0100 | [diff] [blame] | 9354 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
| 9355 | /* there is little hope left, don't run it too often */ |
| 9356 | interval = HZ * 60; |
| 9357 | } |
| 9358 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9359 | |
Pavel Begunkov | 7f00651 | 2021-04-14 13:38:34 +0100 | [diff] [blame] | 9360 | init_completion(&exit.completion); |
| 9361 | init_task_work(&exit.task_work, io_tctx_exit_cb); |
| 9362 | exit.ctx = ctx; |
Pavel Begunkov | 89b5066 | 2021-04-01 15:43:50 +0100 | [diff] [blame] | 9363 | /* |
| 9364 | * Some may use context even when all refs and requests have been put, |
| 9365 | * and they are free to do so while still holding uring_lock or |
Pavel Begunkov | 5b0a6ac | 2021-06-30 21:54:04 +0100 | [diff] [blame] | 9366 | * completion_lock, see io_req_task_submit(). Apart from other work, |
Pavel Begunkov | 89b5066 | 2021-04-01 15:43:50 +0100 | [diff] [blame] | 9367 | * this lock/unlock section also waits them to finish. |
| 9368 | */ |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9369 | mutex_lock(&ctx->uring_lock); |
| 9370 | while (!list_empty(&ctx->tctx_list)) { |
Pavel Begunkov | b5bb3a2 | 2021-03-06 11:02:16 +0000 | [diff] [blame] | 9371 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
| 9372 | |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9373 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
| 9374 | ctx_node); |
Pavel Begunkov | 7f00651 | 2021-04-14 13:38:34 +0100 | [diff] [blame] | 9375 | /* don't spin on a single task if cancellation failed */ |
| 9376 | list_rotate_left(&ctx->tctx_list); |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9377 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
| 9378 | if (WARN_ON_ONCE(ret)) |
| 9379 | continue; |
| 9380 | wake_up_process(node->task); |
| 9381 | |
| 9382 | mutex_unlock(&ctx->uring_lock); |
| 9383 | wait_for_completion(&exit.completion); |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9384 | mutex_lock(&ctx->uring_lock); |
| 9385 | } |
| 9386 | mutex_unlock(&ctx->uring_lock); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 9387 | spin_lock(&ctx->completion_lock); |
| 9388 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | d56d938 | 2021-03-06 11:02:13 +0000 | [diff] [blame] | 9389 | |
Jens Axboe | 85faa7b | 2020-04-09 18:14:00 -0600 | [diff] [blame] | 9390 | io_ring_ctx_free(ctx); |
| 9391 | } |
| 9392 | |
Pavel Begunkov | 80c4cbd | 2021-03-25 18:32:43 +0000 | [diff] [blame] | 9393 | /* Returns true if we found and killed one or more timeouts */ |
| 9394 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9395 | bool cancel_all) |
Pavel Begunkov | 80c4cbd | 2021-03-25 18:32:43 +0000 | [diff] [blame] | 9396 | { |
| 9397 | struct io_kiocb *req, *tmp; |
| 9398 | int canceled = 0; |
| 9399 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 9400 | spin_lock(&ctx->completion_lock); |
| 9401 | spin_lock_irq(&ctx->timeout_lock); |
Pavel Begunkov | 80c4cbd | 2021-03-25 18:32:43 +0000 | [diff] [blame] | 9402 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9403 | if (io_match_task(req, tsk, cancel_all)) { |
Pavel Begunkov | 80c4cbd | 2021-03-25 18:32:43 +0000 | [diff] [blame] | 9404 | io_kill_timeout(req, -ECANCELED); |
| 9405 | canceled++; |
| 9406 | } |
| 9407 | } |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 9408 | spin_unlock_irq(&ctx->timeout_lock); |
Pavel Begunkov | 5152042 | 2021-03-29 11:39:29 +0100 | [diff] [blame] | 9409 | if (canceled != 0) |
| 9410 | io_commit_cqring(ctx); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 9411 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | 80c4cbd | 2021-03-25 18:32:43 +0000 | [diff] [blame] | 9412 | if (canceled != 0) |
| 9413 | io_cqring_ev_posted(ctx); |
| 9414 | return canceled != 0; |
| 9415 | } |
| 9416 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9417 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
| 9418 | { |
Matthew Wilcox (Oracle) | 61cf937 | 2021-03-08 14:16:16 +0000 | [diff] [blame] | 9419 | unsigned long index; |
| 9420 | struct creds *creds; |
| 9421 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9422 | mutex_lock(&ctx->uring_lock); |
| 9423 | percpu_ref_kill(&ctx->refs); |
Pavel Begunkov | 634578f | 2020-12-06 22:22:44 +0000 | [diff] [blame] | 9424 | if (ctx->rings) |
Pavel Begunkov | 6c2450a | 2021-02-23 12:40:22 +0000 | [diff] [blame] | 9425 | __io_cqring_overflow_flush(ctx, true); |
Matthew Wilcox (Oracle) | 61cf937 | 2021-03-08 14:16:16 +0000 | [diff] [blame] | 9426 | xa_for_each(&ctx->personalities, index, creds) |
| 9427 | io_unregister_personality(ctx, index); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9428 | mutex_unlock(&ctx->uring_lock); |
| 9429 | |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9430 | io_kill_timeouts(ctx, NULL, true); |
| 9431 | io_poll_remove_all(ctx, NULL, true); |
Jens Axboe | 561fb04 | 2019-10-24 07:25:42 -0600 | [diff] [blame] | 9432 | |
Jens Axboe | 15dff28 | 2019-11-13 09:09:23 -0700 | [diff] [blame] | 9433 | /* if we failed setting up the ctx, we might not have any rings */ |
Pavel Begunkov | b2edc0a | 2020-07-07 16:36:22 +0300 | [diff] [blame] | 9434 | io_iopoll_try_reap_events(ctx); |
Jens Axboe | 309fc03 | 2020-07-10 09:13:34 -0600 | [diff] [blame] | 9435 | |
Jens Axboe | 85faa7b | 2020-04-09 18:14:00 -0600 | [diff] [blame] | 9436 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
Jens Axboe | fc66677 | 2020-08-19 11:10:51 -0600 | [diff] [blame] | 9437 | /* |
| 9438 | * Use system_unbound_wq to avoid spawning tons of event kworkers |
| 9439 | * if we're exiting a ton of rings at the same time. It just adds |
| 9440 | * noise and overhead, there's no discernable change in runtime |
| 9441 | * over using system_wq. |
| 9442 | */ |
| 9443 | queue_work(system_unbound_wq, &ctx->exit_work); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9444 | } |
| 9445 | |
| 9446 | static int io_uring_release(struct inode *inode, struct file *file) |
| 9447 | { |
| 9448 | struct io_ring_ctx *ctx = file->private_data; |
| 9449 | |
| 9450 | file->private_data = NULL; |
| 9451 | io_ring_ctx_wait_and_kill(ctx); |
| 9452 | return 0; |
| 9453 | } |
| 9454 | |
Pavel Begunkov | f6edbab | 2020-11-06 13:00:26 +0000 | [diff] [blame] | 9455 | struct io_task_cancel { |
| 9456 | struct task_struct *task; |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9457 | bool all; |
Pavel Begunkov | f6edbab | 2020-11-06 13:00:26 +0000 | [diff] [blame] | 9458 | }; |
Pavel Begunkov | 67c4d9e | 2020-06-15 10:24:05 +0300 | [diff] [blame] | 9459 | |
Pavel Begunkov | f6edbab | 2020-11-06 13:00:26 +0000 | [diff] [blame] | 9460 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
Jens Axboe | b711d4e | 2020-08-16 08:23:05 -0700 | [diff] [blame] | 9461 | { |
Pavel Begunkov | 9a472ef | 2020-11-05 22:31:37 +0000 | [diff] [blame] | 9462 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
Pavel Begunkov | f6edbab | 2020-11-06 13:00:26 +0000 | [diff] [blame] | 9463 | struct io_task_cancel *cancel = data; |
Pavel Begunkov | 9a472ef | 2020-11-05 22:31:37 +0000 | [diff] [blame] | 9464 | bool ret; |
| 9465 | |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9466 | if (!cancel->all && (req->flags & REQ_F_LINK_TIMEOUT)) { |
Pavel Begunkov | 9a472ef | 2020-11-05 22:31:37 +0000 | [diff] [blame] | 9467 | struct io_ring_ctx *ctx = req->ctx; |
| 9468 | |
| 9469 | /* protect against races with linked timeouts */ |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 9470 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9471 | ret = io_match_task(req, cancel->task, cancel->all); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 9472 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | 9a472ef | 2020-11-05 22:31:37 +0000 | [diff] [blame] | 9473 | } else { |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9474 | ret = io_match_task(req, cancel->task, cancel->all); |
Pavel Begunkov | 9a472ef | 2020-11-05 22:31:37 +0000 | [diff] [blame] | 9475 | } |
| 9476 | return ret; |
Jens Axboe | b711d4e | 2020-08-16 08:23:05 -0700 | [diff] [blame] | 9477 | } |
| 9478 | |
Pavel Begunkov | e1915f7 | 2021-03-11 23:29:35 +0000 | [diff] [blame] | 9479 | static bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9480 | struct task_struct *task, bool cancel_all) |
Pavel Begunkov | b7ddce3 | 2020-09-06 00:45:14 +0300 | [diff] [blame] | 9481 | { |
Pavel Begunkov | e1915f7 | 2021-03-11 23:29:35 +0000 | [diff] [blame] | 9482 | struct io_defer_entry *de; |
Pavel Begunkov | b7ddce3 | 2020-09-06 00:45:14 +0300 | [diff] [blame] | 9483 | LIST_HEAD(list); |
| 9484 | |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 9485 | spin_lock(&ctx->completion_lock); |
Pavel Begunkov | b7ddce3 | 2020-09-06 00:45:14 +0300 | [diff] [blame] | 9486 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9487 | if (io_match_task(de->req, task, cancel_all)) { |
Pavel Begunkov | b7ddce3 | 2020-09-06 00:45:14 +0300 | [diff] [blame] | 9488 | list_cut_position(&list, &ctx->defer_list, &de->list); |
| 9489 | break; |
| 9490 | } |
| 9491 | } |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 9492 | spin_unlock(&ctx->completion_lock); |
Pavel Begunkov | e1915f7 | 2021-03-11 23:29:35 +0000 | [diff] [blame] | 9493 | if (list_empty(&list)) |
| 9494 | return false; |
Pavel Begunkov | b7ddce3 | 2020-09-06 00:45:14 +0300 | [diff] [blame] | 9495 | |
| 9496 | while (!list_empty(&list)) { |
| 9497 | de = list_first_entry(&list, struct io_defer_entry, list); |
| 9498 | list_del_init(&de->list); |
Pavel Begunkov | f41db273 | 2021-02-28 22:35:12 +0000 | [diff] [blame] | 9499 | io_req_complete_failed(de->req, -ECANCELED); |
Pavel Begunkov | b7ddce3 | 2020-09-06 00:45:14 +0300 | [diff] [blame] | 9500 | kfree(de); |
| 9501 | } |
Pavel Begunkov | e1915f7 | 2021-03-11 23:29:35 +0000 | [diff] [blame] | 9502 | return true; |
Pavel Begunkov | b7ddce3 | 2020-09-06 00:45:14 +0300 | [diff] [blame] | 9503 | } |
| 9504 | |
Pavel Begunkov | 1b00764 | 2021-03-06 11:02:17 +0000 | [diff] [blame] | 9505 | static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
| 9506 | { |
| 9507 | struct io_tctx_node *node; |
| 9508 | enum io_wq_cancel cret; |
| 9509 | bool ret = false; |
| 9510 | |
| 9511 | mutex_lock(&ctx->uring_lock); |
| 9512 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { |
| 9513 | struct io_uring_task *tctx = node->task->io_uring; |
| 9514 | |
| 9515 | /* |
| 9516 | * io_wq will stay alive while we hold uring_lock, because it's |
| 9517 | * killed after ctx nodes, which requires to take the lock. |
| 9518 | */ |
| 9519 | if (!tctx || !tctx->io_wq) |
| 9520 | continue; |
| 9521 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); |
| 9522 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); |
| 9523 | } |
| 9524 | mutex_unlock(&ctx->uring_lock); |
| 9525 | |
| 9526 | return ret; |
| 9527 | } |
| 9528 | |
Pavel Begunkov | 9936c7c | 2021-02-04 13:51:56 +0000 | [diff] [blame] | 9529 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
| 9530 | struct task_struct *task, |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9531 | bool cancel_all) |
Pavel Begunkov | 9936c7c | 2021-02-04 13:51:56 +0000 | [diff] [blame] | 9532 | { |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9533 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
Pavel Begunkov | 1b00764 | 2021-03-06 11:02:17 +0000 | [diff] [blame] | 9534 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
Pavel Begunkov | 9936c7c | 2021-02-04 13:51:56 +0000 | [diff] [blame] | 9535 | |
| 9536 | while (1) { |
| 9537 | enum io_wq_cancel cret; |
| 9538 | bool ret = false; |
| 9539 | |
Pavel Begunkov | 1b00764 | 2021-03-06 11:02:17 +0000 | [diff] [blame] | 9540 | if (!task) { |
| 9541 | ret |= io_uring_try_cancel_iowq(ctx); |
| 9542 | } else if (tctx && tctx->io_wq) { |
| 9543 | /* |
| 9544 | * Cancels requests of all rings, not only @ctx, but |
| 9545 | * it's fine as the task is in exit/exec. |
| 9546 | */ |
Jens Axboe | 5aa75ed | 2021-02-16 12:56:50 -0700 | [diff] [blame] | 9547 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
Pavel Begunkov | 9936c7c | 2021-02-04 13:51:56 +0000 | [diff] [blame] | 9548 | &cancel, true); |
| 9549 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); |
| 9550 | } |
| 9551 | |
| 9552 | /* SQPOLL thread does its own polling */ |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9553 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
Jens Axboe | d052d1d | 2021-03-11 10:49:20 -0700 | [diff] [blame] | 9554 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
Pavel Begunkov | 9936c7c | 2021-02-04 13:51:56 +0000 | [diff] [blame] | 9555 | while (!list_empty_careful(&ctx->iopoll_list)) { |
| 9556 | io_iopoll_try_reap_events(ctx); |
| 9557 | ret = true; |
| 9558 | } |
| 9559 | } |
| 9560 | |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9561 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
| 9562 | ret |= io_poll_remove_all(ctx, task, cancel_all); |
| 9563 | ret |= io_kill_timeouts(ctx, task, cancel_all); |
Pavel Begunkov | e5dc480 | 2021-06-26 21:40:46 +0100 | [diff] [blame] | 9564 | if (task) |
| 9565 | ret |= io_run_task_work(); |
Pavel Begunkov | 9936c7c | 2021-02-04 13:51:56 +0000 | [diff] [blame] | 9566 | if (!ret) |
| 9567 | break; |
| 9568 | cond_resched(); |
| 9569 | } |
| 9570 | } |
| 9571 | |
Pavel Begunkov | eef51da | 2021-06-14 02:36:15 +0100 | [diff] [blame] | 9572 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9573 | { |
Matthew Wilcox (Oracle) | 236434c | 2020-10-09 13:49:52 +0100 | [diff] [blame] | 9574 | struct io_uring_task *tctx = current->io_uring; |
Pavel Begunkov | 13bf43f | 2021-03-06 11:02:12 +0000 | [diff] [blame] | 9575 | struct io_tctx_node *node; |
Pavel Begunkov | a528b04 | 2020-12-21 18:34:04 +0000 | [diff] [blame] | 9576 | int ret; |
Matthew Wilcox (Oracle) | 236434c | 2020-10-09 13:49:52 +0100 | [diff] [blame] | 9577 | |
| 9578 | if (unlikely(!tctx)) { |
Jens Axboe | 5aa75ed | 2021-02-16 12:56:50 -0700 | [diff] [blame] | 9579 | ret = io_uring_alloc_task_context(current, ctx); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9580 | if (unlikely(ret)) |
| 9581 | return ret; |
Matthew Wilcox (Oracle) | 236434c | 2020-10-09 13:49:52 +0100 | [diff] [blame] | 9582 | tctx = current->io_uring; |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9583 | } |
Pavel Begunkov | cf27f3b | 2021-03-19 17:22:31 +0000 | [diff] [blame] | 9584 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
| 9585 | node = kmalloc(sizeof(*node), GFP_KERNEL); |
| 9586 | if (!node) |
| 9587 | return -ENOMEM; |
| 9588 | node->ctx = ctx; |
| 9589 | node->task = current; |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9590 | |
Pavel Begunkov | cf27f3b | 2021-03-19 17:22:31 +0000 | [diff] [blame] | 9591 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
| 9592 | node, GFP_KERNEL)); |
| 9593 | if (ret) { |
| 9594 | kfree(node); |
| 9595 | return ret; |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9596 | } |
Pavel Begunkov | cf27f3b | 2021-03-19 17:22:31 +0000 | [diff] [blame] | 9597 | |
| 9598 | mutex_lock(&ctx->uring_lock); |
| 9599 | list_add(&node->ctx_node, &ctx->tctx_list); |
| 9600 | mutex_unlock(&ctx->uring_lock); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9601 | } |
Pavel Begunkov | cf27f3b | 2021-03-19 17:22:31 +0000 | [diff] [blame] | 9602 | tctx->last = ctx; |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9603 | return 0; |
| 9604 | } |
| 9605 | |
| 9606 | /* |
Pavel Begunkov | cf27f3b | 2021-03-19 17:22:31 +0000 | [diff] [blame] | 9607 | * Note that this task has used io_uring. We use it for cancelation purposes. |
| 9608 | */ |
Pavel Begunkov | eef51da | 2021-06-14 02:36:15 +0100 | [diff] [blame] | 9609 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
Pavel Begunkov | cf27f3b | 2021-03-19 17:22:31 +0000 | [diff] [blame] | 9610 | { |
| 9611 | struct io_uring_task *tctx = current->io_uring; |
| 9612 | |
| 9613 | if (likely(tctx && tctx->last == ctx)) |
| 9614 | return 0; |
Pavel Begunkov | eef51da | 2021-06-14 02:36:15 +0100 | [diff] [blame] | 9615 | return __io_uring_add_tctx_node(ctx); |
Pavel Begunkov | cf27f3b | 2021-03-19 17:22:31 +0000 | [diff] [blame] | 9616 | } |
| 9617 | |
| 9618 | /* |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9619 | * Remove this io_uring_file -> task mapping. |
| 9620 | */ |
Pavel Begunkov | eef51da | 2021-06-14 02:36:15 +0100 | [diff] [blame] | 9621 | static void io_uring_del_tctx_node(unsigned long index) |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9622 | { |
| 9623 | struct io_uring_task *tctx = current->io_uring; |
Pavel Begunkov | 13bf43f | 2021-03-06 11:02:12 +0000 | [diff] [blame] | 9624 | struct io_tctx_node *node; |
Pavel Begunkov | 2941267 | 2021-03-06 11:02:11 +0000 | [diff] [blame] | 9625 | |
Pavel Begunkov | eebd2e3 | 2021-03-06 11:02:14 +0000 | [diff] [blame] | 9626 | if (!tctx) |
| 9627 | return; |
Pavel Begunkov | 13bf43f | 2021-03-06 11:02:12 +0000 | [diff] [blame] | 9628 | node = xa_erase(&tctx->xa, index); |
| 9629 | if (!node) |
Pavel Begunkov | 2941267 | 2021-03-06 11:02:11 +0000 | [diff] [blame] | 9630 | return; |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9631 | |
Pavel Begunkov | 13bf43f | 2021-03-06 11:02:12 +0000 | [diff] [blame] | 9632 | WARN_ON_ONCE(current != node->task); |
| 9633 | WARN_ON_ONCE(list_empty(&node->ctx_node)); |
| 9634 | |
| 9635 | mutex_lock(&node->ctx->uring_lock); |
| 9636 | list_del(&node->ctx_node); |
| 9637 | mutex_unlock(&node->ctx->uring_lock); |
| 9638 | |
Pavel Begunkov | baf186c | 2021-03-06 11:02:15 +0000 | [diff] [blame] | 9639 | if (tctx->last == node->ctx) |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9640 | tctx->last = NULL; |
Pavel Begunkov | 13bf43f | 2021-03-06 11:02:12 +0000 | [diff] [blame] | 9641 | kfree(node); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9642 | } |
| 9643 | |
Pavel Begunkov | 8452d4a | 2021-02-27 11:16:46 +0000 | [diff] [blame] | 9644 | static void io_uring_clean_tctx(struct io_uring_task *tctx) |
Pavel Begunkov | de7f1d9 | 2021-01-04 20:43:29 +0000 | [diff] [blame] | 9645 | { |
Pavel Begunkov | ba5ef6d | 2021-05-20 13:21:20 +0100 | [diff] [blame] | 9646 | struct io_wq *wq = tctx->io_wq; |
Pavel Begunkov | 13bf43f | 2021-03-06 11:02:12 +0000 | [diff] [blame] | 9647 | struct io_tctx_node *node; |
Pavel Begunkov | de7f1d9 | 2021-01-04 20:43:29 +0000 | [diff] [blame] | 9648 | unsigned long index; |
| 9649 | |
Pavel Begunkov | 13bf43f | 2021-03-06 11:02:12 +0000 | [diff] [blame] | 9650 | xa_for_each(&tctx->xa, index, node) |
Pavel Begunkov | eef51da | 2021-06-14 02:36:15 +0100 | [diff] [blame] | 9651 | io_uring_del_tctx_node(index); |
Marco Elver | b16ef42 | 2021-05-27 11:25:48 +0200 | [diff] [blame] | 9652 | if (wq) { |
| 9653 | /* |
| 9654 | * Must be after io_uring_del_task_file() (removes nodes under |
| 9655 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). |
| 9656 | */ |
Pavel Begunkov | ba5ef6d | 2021-05-20 13:21:20 +0100 | [diff] [blame] | 9657 | io_wq_put_and_exit(wq); |
Pavel Begunkov | dadebc3 | 2021-08-23 13:30:44 +0100 | [diff] [blame] | 9658 | tctx->io_wq = NULL; |
Marco Elver | b16ef42 | 2021-05-27 11:25:48 +0200 | [diff] [blame] | 9659 | } |
Pavel Begunkov | de7f1d9 | 2021-01-04 20:43:29 +0000 | [diff] [blame] | 9660 | } |
| 9661 | |
Pavel Begunkov | 3f48cf1 | 2021-04-11 01:46:27 +0100 | [diff] [blame] | 9662 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
Pavel Begunkov | 521d6a7 | 2021-03-11 23:29:38 +0000 | [diff] [blame] | 9663 | { |
Pavel Begunkov | 3f48cf1 | 2021-04-11 01:46:27 +0100 | [diff] [blame] | 9664 | if (tracked) |
| 9665 | return atomic_read(&tctx->inflight_tracked); |
Pavel Begunkov | 521d6a7 | 2021-03-11 23:29:38 +0000 | [diff] [blame] | 9666 | return percpu_counter_sum(&tctx->inflight); |
| 9667 | } |
| 9668 | |
Pavel Begunkov | 09899b1 | 2021-06-14 02:36:22 +0100 | [diff] [blame] | 9669 | static void io_uring_drop_tctx_refs(struct task_struct *task) |
| 9670 | { |
| 9671 | struct io_uring_task *tctx = task->io_uring; |
| 9672 | unsigned int refs = tctx->cached_refs; |
| 9673 | |
Pavel Begunkov | e9dbe22 | 2021-08-09 13:04:20 +0100 | [diff] [blame] | 9674 | if (refs) { |
| 9675 | tctx->cached_refs = 0; |
| 9676 | percpu_counter_sub(&tctx->inflight, refs); |
| 9677 | put_task_struct_many(task, refs); |
| 9678 | } |
Pavel Begunkov | 09899b1 | 2021-06-14 02:36:22 +0100 | [diff] [blame] | 9679 | } |
| 9680 | |
Pavel Begunkov | 78cc687 | 2021-06-14 02:36:23 +0100 | [diff] [blame] | 9681 | /* |
| 9682 | * Find any io_uring ctx that this task has registered or done IO on, and cancel |
| 9683 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. |
| 9684 | */ |
| 9685 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd) |
Pavel Begunkov | 0e9ddb3 | 2021-02-07 22:34:26 +0000 | [diff] [blame] | 9686 | { |
Pavel Begunkov | 521d6a7 | 2021-03-11 23:29:38 +0000 | [diff] [blame] | 9687 | struct io_uring_task *tctx = current->io_uring; |
Pavel Begunkov | 734551d | 2021-04-18 14:52:09 +0100 | [diff] [blame] | 9688 | struct io_ring_ctx *ctx; |
Jens Axboe | fdaf083 | 2020-10-30 09:37:30 -0600 | [diff] [blame] | 9689 | s64 inflight; |
Pavel Begunkov | 0e9ddb3 | 2021-02-07 22:34:26 +0000 | [diff] [blame] | 9690 | DEFINE_WAIT(wait); |
Jens Axboe | fdaf083 | 2020-10-30 09:37:30 -0600 | [diff] [blame] | 9691 | |
Pavel Begunkov | 78cc687 | 2021-06-14 02:36:23 +0100 | [diff] [blame] | 9692 | WARN_ON_ONCE(sqd && sqd->thread != current); |
| 9693 | |
Palash Oswal | 6d042ff | 2021-04-27 18:21:49 +0530 | [diff] [blame] | 9694 | if (!current->io_uring) |
| 9695 | return; |
Pavel Begunkov | 17a9105 | 2021-05-23 15:48:39 +0100 | [diff] [blame] | 9696 | if (tctx->io_wq) |
| 9697 | io_wq_exit_start(tctx->io_wq); |
| 9698 | |
Jens Axboe | fdaf083 | 2020-10-30 09:37:30 -0600 | [diff] [blame] | 9699 | atomic_inc(&tctx->in_idle); |
Jens Axboe | d8a6df1 | 2020-10-15 16:24:45 -0600 | [diff] [blame] | 9700 | do { |
Pavel Begunkov | e9dbe22 | 2021-08-09 13:04:20 +0100 | [diff] [blame] | 9701 | io_uring_drop_tctx_refs(current); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9702 | /* read completions before cancelations */ |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9703 | inflight = tctx_inflight(tctx, !cancel_all); |
Jens Axboe | d8a6df1 | 2020-10-15 16:24:45 -0600 | [diff] [blame] | 9704 | if (!inflight) |
| 9705 | break; |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9706 | |
Pavel Begunkov | 78cc687 | 2021-06-14 02:36:23 +0100 | [diff] [blame] | 9707 | if (!sqd) { |
| 9708 | struct io_tctx_node *node; |
| 9709 | unsigned long index; |
| 9710 | |
| 9711 | xa_for_each(&tctx->xa, index, node) { |
| 9712 | /* sqpoll task will cancel all its requests */ |
| 9713 | if (node->ctx->sq_data) |
| 9714 | continue; |
| 9715 | io_uring_try_cancel_requests(node->ctx, current, |
| 9716 | cancel_all); |
| 9717 | } |
| 9718 | } else { |
| 9719 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
| 9720 | io_uring_try_cancel_requests(ctx, current, |
| 9721 | cancel_all); |
| 9722 | } |
| 9723 | |
| 9724 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
Pavel Begunkov | e9dbe22 | 2021-08-09 13:04:20 +0100 | [diff] [blame] | 9725 | io_uring_drop_tctx_refs(current); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9726 | /* |
Pavel Begunkov | a1bb3cd | 2021-01-26 15:28:26 +0000 | [diff] [blame] | 9727 | * If we've seen completions, retry without waiting. This |
| 9728 | * avoids a race where a completion comes in before we did |
| 9729 | * prepare_to_wait(). |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9730 | */ |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9731 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
Pavel Begunkov | a1bb3cd | 2021-01-26 15:28:26 +0000 | [diff] [blame] | 9732 | schedule(); |
Pavel Begunkov | f57555e | 2020-12-20 13:21:44 +0000 | [diff] [blame] | 9733 | finish_wait(&tctx->wait, &wait); |
Jens Axboe | d8a6df1 | 2020-10-15 16:24:45 -0600 | [diff] [blame] | 9734 | } while (1); |
Jens Axboe | fdaf083 | 2020-10-30 09:37:30 -0600 | [diff] [blame] | 9735 | atomic_dec(&tctx->in_idle); |
Pavel Begunkov | de7f1d9 | 2021-01-04 20:43:29 +0000 | [diff] [blame] | 9736 | |
Pavel Begunkov | 8452d4a | 2021-02-27 11:16:46 +0000 | [diff] [blame] | 9737 | io_uring_clean_tctx(tctx); |
Pavel Begunkov | 3dd0c97 | 2021-05-16 22:58:04 +0100 | [diff] [blame] | 9738 | if (cancel_all) { |
Pavel Begunkov | 3f48cf1 | 2021-04-11 01:46:27 +0100 | [diff] [blame] | 9739 | /* for exec all current's requests should be gone, kill tctx */ |
| 9740 | __io_uring_free(current); |
| 9741 | } |
Pavel Begunkov | 44e728b | 2020-06-15 10:24:04 +0300 | [diff] [blame] | 9742 | } |
| 9743 | |
Hao Xu | f552a27 | 2021-08-12 12:14:35 +0800 | [diff] [blame] | 9744 | void __io_uring_cancel(bool cancel_all) |
Pavel Begunkov | 78cc687 | 2021-06-14 02:36:23 +0100 | [diff] [blame] | 9745 | { |
Hao Xu | f552a27 | 2021-08-12 12:14:35 +0800 | [diff] [blame] | 9746 | io_uring_cancel_generic(cancel_all, NULL); |
Pavel Begunkov | 78cc687 | 2021-06-14 02:36:23 +0100 | [diff] [blame] | 9747 | } |
| 9748 | |
Roman Penyaev | 6c5c240 | 2019-11-28 12:53:22 +0100 | [diff] [blame] | 9749 | static void *io_uring_validate_mmap_request(struct file *file, |
| 9750 | loff_t pgoff, size_t sz) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9751 | { |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9752 | struct io_ring_ctx *ctx = file->private_data; |
Roman Penyaev | 6c5c240 | 2019-11-28 12:53:22 +0100 | [diff] [blame] | 9753 | loff_t offset = pgoff << PAGE_SHIFT; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9754 | struct page *page; |
| 9755 | void *ptr; |
| 9756 | |
| 9757 | switch (offset) { |
| 9758 | case IORING_OFF_SQ_RING: |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 9759 | case IORING_OFF_CQ_RING: |
| 9760 | ptr = ctx->rings; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9761 | break; |
| 9762 | case IORING_OFF_SQES: |
| 9763 | ptr = ctx->sq_sqes; |
| 9764 | break; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9765 | default: |
Roman Penyaev | 6c5c240 | 2019-11-28 12:53:22 +0100 | [diff] [blame] | 9766 | return ERR_PTR(-EINVAL); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9767 | } |
| 9768 | |
| 9769 | page = virt_to_head_page(ptr); |
Matthew Wilcox (Oracle) | a50b854 | 2019-09-23 15:34:25 -0700 | [diff] [blame] | 9770 | if (sz > page_size(page)) |
Roman Penyaev | 6c5c240 | 2019-11-28 12:53:22 +0100 | [diff] [blame] | 9771 | return ERR_PTR(-EINVAL); |
| 9772 | |
| 9773 | return ptr; |
| 9774 | } |
| 9775 | |
| 9776 | #ifdef CONFIG_MMU |
| 9777 | |
| 9778 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) |
| 9779 | { |
| 9780 | size_t sz = vma->vm_end - vma->vm_start; |
| 9781 | unsigned long pfn; |
| 9782 | void *ptr; |
| 9783 | |
| 9784 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); |
| 9785 | if (IS_ERR(ptr)) |
| 9786 | return PTR_ERR(ptr); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9787 | |
| 9788 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; |
| 9789 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); |
| 9790 | } |
| 9791 | |
Roman Penyaev | 6c5c240 | 2019-11-28 12:53:22 +0100 | [diff] [blame] | 9792 | #else /* !CONFIG_MMU */ |
| 9793 | |
| 9794 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) |
| 9795 | { |
| 9796 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; |
| 9797 | } |
| 9798 | |
| 9799 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) |
| 9800 | { |
| 9801 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; |
| 9802 | } |
| 9803 | |
| 9804 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, |
| 9805 | unsigned long addr, unsigned long len, |
| 9806 | unsigned long pgoff, unsigned long flags) |
| 9807 | { |
| 9808 | void *ptr; |
| 9809 | |
| 9810 | ptr = io_uring_validate_mmap_request(file, pgoff, len); |
| 9811 | if (IS_ERR(ptr)) |
| 9812 | return PTR_ERR(ptr); |
| 9813 | |
| 9814 | return (unsigned long) ptr; |
| 9815 | } |
| 9816 | |
| 9817 | #endif /* !CONFIG_MMU */ |
| 9818 | |
Pavel Begunkov | d9d0521 | 2021-01-08 20:57:25 +0000 | [diff] [blame] | 9819 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 9820 | { |
| 9821 | DEFINE_WAIT(wait); |
| 9822 | |
| 9823 | do { |
| 9824 | if (!io_sqring_full(ctx)) |
| 9825 | break; |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 9826 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
| 9827 | |
| 9828 | if (!io_sqring_full(ctx)) |
| 9829 | break; |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 9830 | schedule(); |
| 9831 | } while (!signal_pending(current)); |
| 9832 | |
| 9833 | finish_wait(&ctx->sqo_sq_wait, &wait); |
Yang Li | 5199328 | 2021-03-09 14:30:41 +0800 | [diff] [blame] | 9834 | return 0; |
Jens Axboe | 9055420 | 2020-09-03 12:12:41 -0600 | [diff] [blame] | 9835 | } |
| 9836 | |
Hao Xu | c73ebb6 | 2020-11-03 10:54:37 +0800 | [diff] [blame] | 9837 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
| 9838 | struct __kernel_timespec __user **ts, |
| 9839 | const sigset_t __user **sig) |
| 9840 | { |
| 9841 | struct io_uring_getevents_arg arg; |
| 9842 | |
| 9843 | /* |
| 9844 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer |
| 9845 | * is just a pointer to the sigset_t. |
| 9846 | */ |
| 9847 | if (!(flags & IORING_ENTER_EXT_ARG)) { |
| 9848 | *sig = (const sigset_t __user *) argp; |
| 9849 | *ts = NULL; |
| 9850 | return 0; |
| 9851 | } |
| 9852 | |
| 9853 | /* |
| 9854 | * EXT_ARG is set - ensure we agree on the size of it and copy in our |
| 9855 | * timespec and sigset_t pointers if good. |
| 9856 | */ |
| 9857 | if (*argsz != sizeof(arg)) |
| 9858 | return -EINVAL; |
| 9859 | if (copy_from_user(&arg, argp, sizeof(arg))) |
| 9860 | return -EFAULT; |
| 9861 | *sig = u64_to_user_ptr(arg.sigmask); |
| 9862 | *argsz = arg.sigmask_sz; |
| 9863 | *ts = u64_to_user_ptr(arg.ts); |
| 9864 | return 0; |
| 9865 | } |
| 9866 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9867 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
Hao Xu | c73ebb6 | 2020-11-03 10:54:37 +0800 | [diff] [blame] | 9868 | u32, min_complete, u32, flags, const void __user *, argp, |
| 9869 | size_t, argsz) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9870 | { |
| 9871 | struct io_ring_ctx *ctx; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9872 | int submitted = 0; |
| 9873 | struct fd f; |
Pavel Begunkov | 33f993d | 2021-03-19 17:22:30 +0000 | [diff] [blame] | 9874 | long ret; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9875 | |
Jens Axboe | 4c6e277 | 2020-07-01 11:29:10 -0600 | [diff] [blame] | 9876 | io_run_task_work(); |
Jens Axboe | b41e985 | 2020-02-17 09:52:41 -0700 | [diff] [blame] | 9877 | |
Pavel Begunkov | 33f993d | 2021-03-19 17:22:30 +0000 | [diff] [blame] | 9878 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
| 9879 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9880 | return -EINVAL; |
| 9881 | |
| 9882 | f = fdget(fd); |
Pavel Begunkov | 33f993d | 2021-03-19 17:22:30 +0000 | [diff] [blame] | 9883 | if (unlikely(!f.file)) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9884 | return -EBADF; |
| 9885 | |
| 9886 | ret = -EOPNOTSUPP; |
Pavel Begunkov | 33f993d | 2021-03-19 17:22:30 +0000 | [diff] [blame] | 9887 | if (unlikely(f.file->f_op != &io_uring_fops)) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9888 | goto out_fput; |
| 9889 | |
| 9890 | ret = -ENXIO; |
| 9891 | ctx = f.file->private_data; |
Pavel Begunkov | 33f993d | 2021-03-19 17:22:30 +0000 | [diff] [blame] | 9892 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9893 | goto out_fput; |
| 9894 | |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 9895 | ret = -EBADFD; |
Pavel Begunkov | 33f993d | 2021-03-19 17:22:30 +0000 | [diff] [blame] | 9896 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 9897 | goto out; |
| 9898 | |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 9899 | /* |
| 9900 | * For SQ polling, the thread will do all submissions and completions. |
| 9901 | * Just return the requested submit count, and wake the thread if |
| 9902 | * we were asked to. |
| 9903 | */ |
Jens Axboe | b2a9ead | 2019-09-12 14:19:16 -0600 | [diff] [blame] | 9904 | ret = 0; |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 9905 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
Pavel Begunkov | 90f6736 | 2021-08-09 20:18:12 +0100 | [diff] [blame] | 9906 | io_cqring_overflow_flush(ctx); |
Pavel Begunkov | 89448c4 | 2020-12-17 00:24:39 +0000 | [diff] [blame] | 9907 | |
Jens Axboe | 21f9652 | 2021-08-14 09:04:40 -0600 | [diff] [blame] | 9908 | if (unlikely(ctx->sq_data->thread == NULL)) { |
| 9909 | ret = -EOWNERDEAD; |
Stefan Metzmacher | 0414748 | 2021-03-07 11:54:29 +0100 | [diff] [blame] | 9910 | goto out; |
Jens Axboe | 21f9652 | 2021-08-14 09:04:40 -0600 | [diff] [blame] | 9911 | } |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 9912 | if (flags & IORING_ENTER_SQ_WAKEUP) |
Jens Axboe | 534ca6d | 2020-09-02 13:52:19 -0600 | [diff] [blame] | 9913 | wake_up(&ctx->sq_data->wait); |
Pavel Begunkov | d9d0521 | 2021-01-08 20:57:25 +0000 | [diff] [blame] | 9914 | if (flags & IORING_ENTER_SQ_WAIT) { |
| 9915 | ret = io_sqpoll_wait_sq(ctx); |
| 9916 | if (ret) |
| 9917 | goto out; |
| 9918 | } |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 9919 | submitted = to_submit; |
Jens Axboe | b2a9ead | 2019-09-12 14:19:16 -0600 | [diff] [blame] | 9920 | } else if (to_submit) { |
Pavel Begunkov | eef51da | 2021-06-14 02:36:15 +0100 | [diff] [blame] | 9921 | ret = io_uring_add_tctx_node(ctx); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9922 | if (unlikely(ret)) |
| 9923 | goto out; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9924 | mutex_lock(&ctx->uring_lock); |
Jens Axboe | 0f21220 | 2020-09-13 13:09:39 -0600 | [diff] [blame] | 9925 | submitted = io_submit_sqes(ctx, to_submit); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9926 | mutex_unlock(&ctx->uring_lock); |
Pavel Begunkov | 7c504e65 | 2019-12-18 19:53:45 +0300 | [diff] [blame] | 9927 | |
| 9928 | if (submitted != to_submit) |
| 9929 | goto out; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9930 | } |
| 9931 | if (flags & IORING_ENTER_GETEVENTS) { |
Hao Xu | c73ebb6 | 2020-11-03 10:54:37 +0800 | [diff] [blame] | 9932 | const sigset_t __user *sig; |
| 9933 | struct __kernel_timespec __user *ts; |
| 9934 | |
| 9935 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); |
| 9936 | if (unlikely(ret)) |
| 9937 | goto out; |
| 9938 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9939 | min_complete = min(min_complete, ctx->cq_entries); |
| 9940 | |
Xiaoguang Wang | 32b2244 | 2020-03-11 09:26:09 +0800 | [diff] [blame] | 9941 | /* |
| 9942 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user |
| 9943 | * space applications don't need to do io completion events |
| 9944 | * polling again, they can rely on io_sq_thread to do polling |
| 9945 | * work, which can reduce cpu usage and uring_lock contention. |
| 9946 | */ |
| 9947 | if (ctx->flags & IORING_SETUP_IOPOLL && |
| 9948 | !(ctx->flags & IORING_SETUP_SQPOLL)) { |
Pavel Begunkov | 7668b92 | 2020-07-07 16:36:21 +0300 | [diff] [blame] | 9949 | ret = io_iopoll_check(ctx, min_complete); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 9950 | } else { |
Hao Xu | c73ebb6 | 2020-11-03 10:54:37 +0800 | [diff] [blame] | 9951 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
Jens Axboe | def596e | 2019-01-09 08:59:42 -0700 | [diff] [blame] | 9952 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9953 | } |
| 9954 | |
Pavel Begunkov | 7c504e65 | 2019-12-18 19:53:45 +0300 | [diff] [blame] | 9955 | out: |
Pavel Begunkov | 6805b32e | 2019-10-08 02:18:42 +0300 | [diff] [blame] | 9956 | percpu_ref_put(&ctx->refs); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 9957 | out_fput: |
| 9958 | fdput(f); |
| 9959 | return submitted ? submitted : ret; |
| 9960 | } |
| 9961 | |
Tobias Klauser | bebdb65 | 2020-02-26 18:38:32 +0100 | [diff] [blame] | 9962 | #ifdef CONFIG_PROC_FS |
Matthew Wilcox (Oracle) | 61cf937 | 2021-03-08 14:16:16 +0000 | [diff] [blame] | 9963 | static int io_uring_show_cred(struct seq_file *m, unsigned int id, |
| 9964 | const struct cred *cred) |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 9965 | { |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 9966 | struct user_namespace *uns = seq_user_ns(m); |
| 9967 | struct group_info *gi; |
| 9968 | kernel_cap_t cap; |
| 9969 | unsigned __capi; |
| 9970 | int g; |
| 9971 | |
| 9972 | seq_printf(m, "%5d\n", id); |
| 9973 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); |
| 9974 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); |
| 9975 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); |
| 9976 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); |
| 9977 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); |
| 9978 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); |
| 9979 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); |
| 9980 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); |
| 9981 | seq_puts(m, "\n\tGroups:\t"); |
| 9982 | gi = cred->group_info; |
| 9983 | for (g = 0; g < gi->ngroups; g++) { |
| 9984 | seq_put_decimal_ull(m, g ? " " : "", |
| 9985 | from_kgid_munged(uns, gi->gid[g])); |
| 9986 | } |
| 9987 | seq_puts(m, "\n\tCapEff:\t"); |
| 9988 | cap = cred->cap_effective; |
| 9989 | CAP_FOR_EACH_U32(__capi) |
| 9990 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); |
| 9991 | seq_putc(m, '\n'); |
| 9992 | return 0; |
| 9993 | } |
| 9994 | |
| 9995 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) |
| 9996 | { |
Joseph Qi | dbbe9c6 | 2020-09-29 09:01:22 -0600 | [diff] [blame] | 9997 | struct io_sq_data *sq = NULL; |
Jens Axboe | fad8e0d | 2020-09-28 08:57:48 -0600 | [diff] [blame] | 9998 | bool has_lock; |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 9999 | int i; |
| 10000 | |
Jens Axboe | fad8e0d | 2020-09-28 08:57:48 -0600 | [diff] [blame] | 10001 | /* |
| 10002 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, |
| 10003 | * since fdinfo case grabs it in the opposite direction of normal use |
| 10004 | * cases. If we fail to get the lock, we just don't iterate any |
| 10005 | * structures that could be going away outside the io_uring mutex. |
| 10006 | */ |
| 10007 | has_lock = mutex_trylock(&ctx->uring_lock); |
| 10008 | |
Jens Axboe | 5f3f26f | 2021-02-25 10:17:46 -0700 | [diff] [blame] | 10009 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
Joseph Qi | dbbe9c6 | 2020-09-29 09:01:22 -0600 | [diff] [blame] | 10010 | sq = ctx->sq_data; |
Jens Axboe | 5f3f26f | 2021-02-25 10:17:46 -0700 | [diff] [blame] | 10011 | if (!sq->thread) |
| 10012 | sq = NULL; |
| 10013 | } |
Joseph Qi | dbbe9c6 | 2020-09-29 09:01:22 -0600 | [diff] [blame] | 10014 | |
| 10015 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); |
| 10016 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 10017 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
Jens Axboe | fad8e0d | 2020-09-28 08:57:48 -0600 | [diff] [blame] | 10018 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
Jens Axboe | 7b29f92 | 2021-03-12 08:30:14 -0700 | [diff] [blame] | 10019 | struct file *f = io_file_from_index(ctx, i); |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 10020 | |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 10021 | if (f) |
| 10022 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); |
| 10023 | else |
| 10024 | seq_printf(m, "%5u: <none>\n", i); |
| 10025 | } |
| 10026 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); |
Jens Axboe | fad8e0d | 2020-09-28 08:57:48 -0600 | [diff] [blame] | 10027 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
Pavel Begunkov | 41edf1a | 2021-04-25 14:32:23 +0100 | [diff] [blame] | 10028 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
Pavel Begunkov | 4751f53 | 2021-04-01 15:43:55 +0100 | [diff] [blame] | 10029 | unsigned int len = buf->ubuf_end - buf->ubuf; |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 10030 | |
Pavel Begunkov | 4751f53 | 2021-04-01 15:43:55 +0100 | [diff] [blame] | 10031 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 10032 | } |
Matthew Wilcox (Oracle) | 61cf937 | 2021-03-08 14:16:16 +0000 | [diff] [blame] | 10033 | if (has_lock && !xa_empty(&ctx->personalities)) { |
| 10034 | unsigned long index; |
| 10035 | const struct cred *cred; |
| 10036 | |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 10037 | seq_printf(m, "Personalities:\n"); |
Matthew Wilcox (Oracle) | 61cf937 | 2021-03-08 14:16:16 +0000 | [diff] [blame] | 10038 | xa_for_each(&ctx->personalities, index, cred) |
| 10039 | io_uring_show_cred(m, index, cred); |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 10040 | } |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 10041 | seq_printf(m, "PollList:\n"); |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 10042 | spin_lock(&ctx->completion_lock); |
Jens Axboe | d7718a9 | 2020-02-14 22:23:12 -0700 | [diff] [blame] | 10043 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
| 10044 | struct hlist_head *list = &ctx->cancel_hash[i]; |
| 10045 | struct io_kiocb *req; |
| 10046 | |
| 10047 | hlist_for_each_entry(req, list, hash_node) |
| 10048 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, |
| 10049 | req->task->task_works != NULL); |
| 10050 | } |
Jens Axboe | 79ebeae | 2021-08-10 15:18:27 -0600 | [diff] [blame] | 10051 | spin_unlock(&ctx->completion_lock); |
Jens Axboe | fad8e0d | 2020-09-28 08:57:48 -0600 | [diff] [blame] | 10052 | if (has_lock) |
| 10053 | mutex_unlock(&ctx->uring_lock); |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 10054 | } |
| 10055 | |
| 10056 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) |
| 10057 | { |
| 10058 | struct io_ring_ctx *ctx = f->private_data; |
| 10059 | |
| 10060 | if (percpu_ref_tryget(&ctx->refs)) { |
| 10061 | __io_uring_show_fdinfo(ctx, m); |
| 10062 | percpu_ref_put(&ctx->refs); |
| 10063 | } |
| 10064 | } |
Tobias Klauser | bebdb65 | 2020-02-26 18:38:32 +0100 | [diff] [blame] | 10065 | #endif |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 10066 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10067 | static const struct file_operations io_uring_fops = { |
| 10068 | .release = io_uring_release, |
| 10069 | .mmap = io_uring_mmap, |
Roman Penyaev | 6c5c240 | 2019-11-28 12:53:22 +0100 | [diff] [blame] | 10070 | #ifndef CONFIG_MMU |
| 10071 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, |
| 10072 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, |
| 10073 | #endif |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10074 | .poll = io_uring_poll, |
| 10075 | .fasync = io_uring_fasync, |
Tobias Klauser | bebdb65 | 2020-02-26 18:38:32 +0100 | [diff] [blame] | 10076 | #ifdef CONFIG_PROC_FS |
Jens Axboe | 87ce955 | 2020-01-30 08:25:34 -0700 | [diff] [blame] | 10077 | .show_fdinfo = io_uring_show_fdinfo, |
Tobias Klauser | bebdb65 | 2020-02-26 18:38:32 +0100 | [diff] [blame] | 10078 | #endif |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10079 | }; |
| 10080 | |
| 10081 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, |
| 10082 | struct io_uring_params *p) |
| 10083 | { |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 10084 | struct io_rings *rings; |
| 10085 | size_t size, sq_array_offset; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10086 | |
Jens Axboe | bd74048 | 2020-08-05 12:58:23 -0600 | [diff] [blame] | 10087 | /* make sure these are sane, as we already accounted them */ |
| 10088 | ctx->sq_entries = p->sq_entries; |
| 10089 | ctx->cq_entries = p->cq_entries; |
| 10090 | |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 10091 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
| 10092 | if (size == SIZE_MAX) |
| 10093 | return -EOVERFLOW; |
| 10094 | |
| 10095 | rings = io_mem_alloc(size); |
| 10096 | if (!rings) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10097 | return -ENOMEM; |
| 10098 | |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 10099 | ctx->rings = rings; |
| 10100 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); |
| 10101 | rings->sq_ring_mask = p->sq_entries - 1; |
| 10102 | rings->cq_ring_mask = p->cq_entries - 1; |
| 10103 | rings->sq_ring_entries = p->sq_entries; |
| 10104 | rings->cq_ring_entries = p->cq_entries; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10105 | |
| 10106 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); |
Jens Axboe | eb065d3 | 2019-11-20 09:26:29 -0700 | [diff] [blame] | 10107 | if (size == SIZE_MAX) { |
| 10108 | io_mem_free(ctx->rings); |
| 10109 | ctx->rings = NULL; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10110 | return -EOVERFLOW; |
Jens Axboe | eb065d3 | 2019-11-20 09:26:29 -0700 | [diff] [blame] | 10111 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10112 | |
| 10113 | ctx->sq_sqes = io_mem_alloc(size); |
Jens Axboe | eb065d3 | 2019-11-20 09:26:29 -0700 | [diff] [blame] | 10114 | if (!ctx->sq_sqes) { |
| 10115 | io_mem_free(ctx->rings); |
| 10116 | ctx->rings = NULL; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10117 | return -ENOMEM; |
Jens Axboe | eb065d3 | 2019-11-20 09:26:29 -0700 | [diff] [blame] | 10118 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10119 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10120 | return 0; |
| 10121 | } |
| 10122 | |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10123 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
| 10124 | { |
| 10125 | int ret, fd; |
| 10126 | |
| 10127 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); |
| 10128 | if (fd < 0) |
| 10129 | return fd; |
| 10130 | |
Pavel Begunkov | eef51da | 2021-06-14 02:36:15 +0100 | [diff] [blame] | 10131 | ret = io_uring_add_tctx_node(ctx); |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10132 | if (ret) { |
| 10133 | put_unused_fd(fd); |
| 10134 | return ret; |
| 10135 | } |
| 10136 | fd_install(fd, file); |
| 10137 | return fd; |
| 10138 | } |
| 10139 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10140 | /* |
| 10141 | * Allocate an anonymous fd, this is what constitutes the application |
| 10142 | * visible backing of an io_uring instance. The application mmaps this |
| 10143 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, |
| 10144 | * we have to tie this fd to a socket for file garbage collection purposes. |
| 10145 | */ |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10146 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10147 | { |
| 10148 | struct file *file; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10149 | #if defined(CONFIG_UNIX) |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10150 | int ret; |
| 10151 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10152 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
| 10153 | &ctx->ring_sock); |
| 10154 | if (ret) |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10155 | return ERR_PTR(ret); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10156 | #endif |
| 10157 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10158 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
| 10159 | O_RDWR | O_CLOEXEC); |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10160 | #if defined(CONFIG_UNIX) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10161 | if (IS_ERR(file)) { |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10162 | sock_release(ctx->ring_sock); |
| 10163 | ctx->ring_sock = NULL; |
| 10164 | } else { |
| 10165 | ctx->ring_sock->file = file; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10166 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10167 | #endif |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10168 | return file; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10169 | } |
| 10170 | |
Xiaoguang Wang | 7f13657 | 2020-05-05 16:28:53 +0800 | [diff] [blame] | 10171 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
| 10172 | struct io_uring_params __user *params) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10173 | { |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10174 | struct io_ring_ctx *ctx; |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10175 | struct file *file; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10176 | int ret; |
| 10177 | |
Jens Axboe | 8110c1a | 2019-12-28 15:39:54 -0700 | [diff] [blame] | 10178 | if (!entries) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10179 | return -EINVAL; |
Jens Axboe | 8110c1a | 2019-12-28 15:39:54 -0700 | [diff] [blame] | 10180 | if (entries > IORING_MAX_ENTRIES) { |
| 10181 | if (!(p->flags & IORING_SETUP_CLAMP)) |
| 10182 | return -EINVAL; |
| 10183 | entries = IORING_MAX_ENTRIES; |
| 10184 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10185 | |
| 10186 | /* |
| 10187 | * Use twice as many entries for the CQ ring. It's possible for the |
| 10188 | * application to drive a higher depth than the size of the SQ ring, |
| 10189 | * since the sqes are only used at submission time. This allows for |
Jens Axboe | 33a107f | 2019-10-04 12:10:03 -0600 | [diff] [blame] | 10190 | * some flexibility in overcommitting a bit. If the application has |
| 10191 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number |
| 10192 | * of CQ ring entries manually. |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10193 | */ |
| 10194 | p->sq_entries = roundup_pow_of_two(entries); |
Jens Axboe | 33a107f | 2019-10-04 12:10:03 -0600 | [diff] [blame] | 10195 | if (p->flags & IORING_SETUP_CQSIZE) { |
| 10196 | /* |
| 10197 | * If IORING_SETUP_CQSIZE is set, we do the same roundup |
| 10198 | * to a power-of-two, if it isn't already. We do NOT impose |
| 10199 | * any cq vs sq ring sizing. |
| 10200 | */ |
Joseph Qi | eb2667b3 | 2020-11-24 15:03:03 +0800 | [diff] [blame] | 10201 | if (!p->cq_entries) |
Jens Axboe | 33a107f | 2019-10-04 12:10:03 -0600 | [diff] [blame] | 10202 | return -EINVAL; |
Jens Axboe | 8110c1a | 2019-12-28 15:39:54 -0700 | [diff] [blame] | 10203 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
| 10204 | if (!(p->flags & IORING_SETUP_CLAMP)) |
| 10205 | return -EINVAL; |
| 10206 | p->cq_entries = IORING_MAX_CQ_ENTRIES; |
| 10207 | } |
Joseph Qi | eb2667b3 | 2020-11-24 15:03:03 +0800 | [diff] [blame] | 10208 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
| 10209 | if (p->cq_entries < p->sq_entries) |
| 10210 | return -EINVAL; |
Jens Axboe | 33a107f | 2019-10-04 12:10:03 -0600 | [diff] [blame] | 10211 | } else { |
| 10212 | p->cq_entries = 2 * p->sq_entries; |
| 10213 | } |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10214 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10215 | ctx = io_ring_ctx_alloc(p); |
Jens Axboe | 62e398b | 2021-02-21 16:19:37 -0700 | [diff] [blame] | 10216 | if (!ctx) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10217 | return -ENOMEM; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10218 | ctx->compat = in_compat_syscall(); |
Jens Axboe | 62e398b | 2021-02-21 16:19:37 -0700 | [diff] [blame] | 10219 | if (!capable(CAP_IPC_LOCK)) |
| 10220 | ctx->user = get_uid(current_user()); |
Jens Axboe | 2aede0e | 2020-09-14 10:45:53 -0600 | [diff] [blame] | 10221 | |
| 10222 | /* |
| 10223 | * This is just grabbed for accounting purposes. When a process exits, |
| 10224 | * the mm is exited and dropped before the files, hence we need to hang |
| 10225 | * on to this mm purely for the purposes of being able to unaccount |
| 10226 | * memory (locked/pinned vm). It's not used for anything else. |
| 10227 | */ |
Jens Axboe | 6b7898e | 2020-08-25 07:58:00 -0600 | [diff] [blame] | 10228 | mmgrab(current->mm); |
Jens Axboe | 2aede0e | 2020-09-14 10:45:53 -0600 | [diff] [blame] | 10229 | ctx->mm_account = current->mm; |
Jens Axboe | 6b7898e | 2020-08-25 07:58:00 -0600 | [diff] [blame] | 10230 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10231 | ret = io_allocate_scq_urings(ctx, p); |
| 10232 | if (ret) |
| 10233 | goto err; |
| 10234 | |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 10235 | ret = io_sq_offload_create(ctx, p); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10236 | if (ret) |
| 10237 | goto err; |
Pavel Begunkov | eae071c | 2021-04-25 14:32:24 +0100 | [diff] [blame] | 10238 | /* always set a rsrc node */ |
Pavel Begunkov | 47b228c | 2021-04-29 11:46:48 +0100 | [diff] [blame] | 10239 | ret = io_rsrc_node_switch_start(ctx); |
| 10240 | if (ret) |
| 10241 | goto err; |
Pavel Begunkov | eae071c | 2021-04-25 14:32:24 +0100 | [diff] [blame] | 10242 | io_rsrc_node_switch(ctx, NULL); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10243 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10244 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 10245 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
| 10246 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); |
| 10247 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); |
| 10248 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); |
| 10249 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); |
| 10250 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); |
| 10251 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10252 | |
| 10253 | memset(&p->cq_off, 0, sizeof(p->cq_off)); |
Hristo Venev | 75b28af | 2019-08-26 17:23:46 +0000 | [diff] [blame] | 10254 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
| 10255 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); |
| 10256 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); |
| 10257 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); |
| 10258 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); |
| 10259 | p->cq_off.cqes = offsetof(struct io_rings, cqes); |
Stefano Garzarella | 0d9b5b3 | 2020-05-15 18:38:04 +0200 | [diff] [blame] | 10260 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
Jens Axboe | ac90f24 | 2019-09-06 10:26:21 -0600 | [diff] [blame] | 10261 | |
Xiaoguang Wang | 7f13657 | 2020-05-05 16:28:53 +0800 | [diff] [blame] | 10262 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
| 10263 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | |
Jiufei Xue | 5769a35 | 2020-06-17 17:53:55 +0800 | [diff] [blame] | 10264 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
Hao Xu | c73ebb6 | 2020-11-03 10:54:37 +0800 | [diff] [blame] | 10265 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
Pavel Begunkov | 9690557 | 2021-06-10 16:37:38 +0100 | [diff] [blame] | 10266 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
| 10267 | IORING_FEAT_RSRC_TAGS; |
Xiaoguang Wang | 7f13657 | 2020-05-05 16:28:53 +0800 | [diff] [blame] | 10268 | |
| 10269 | if (copy_to_user(params, p, sizeof(*p))) { |
| 10270 | ret = -EFAULT; |
| 10271 | goto err; |
| 10272 | } |
Jens Axboe | d1719f7 | 2020-07-30 13:43:53 -0600 | [diff] [blame] | 10273 | |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10274 | file = io_uring_get_file(ctx); |
| 10275 | if (IS_ERR(file)) { |
| 10276 | ret = PTR_ERR(file); |
| 10277 | goto err; |
| 10278 | } |
| 10279 | |
Jens Axboe | d1719f7 | 2020-07-30 13:43:53 -0600 | [diff] [blame] | 10280 | /* |
Jens Axboe | 044c1ab | 2019-10-28 09:15:33 -0600 | [diff] [blame] | 10281 | * Install ring fd as the very last thing, so we don't risk someone |
| 10282 | * having closed it before we finish setup |
| 10283 | */ |
Pavel Begunkov | 9faadcc | 2020-12-21 18:34:05 +0000 | [diff] [blame] | 10284 | ret = io_uring_install_fd(ctx, file); |
| 10285 | if (ret < 0) { |
| 10286 | /* fput will clean it up */ |
| 10287 | fput(file); |
| 10288 | return ret; |
| 10289 | } |
Jens Axboe | 044c1ab | 2019-10-28 09:15:33 -0600 | [diff] [blame] | 10290 | |
Dmitrii Dolgov | c826bd7 | 2019-10-15 19:02:01 +0200 | [diff] [blame] | 10291 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10292 | return ret; |
| 10293 | err: |
| 10294 | io_ring_ctx_wait_and_kill(ctx); |
| 10295 | return ret; |
| 10296 | } |
| 10297 | |
| 10298 | /* |
| 10299 | * Sets up an aio uring context, and returns the fd. Applications asks for a |
| 10300 | * ring size, we return the actual sq/cq ring sizes (among other things) in the |
| 10301 | * params structure passed in. |
| 10302 | */ |
| 10303 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) |
| 10304 | { |
| 10305 | struct io_uring_params p; |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10306 | int i; |
| 10307 | |
| 10308 | if (copy_from_user(&p, params, sizeof(p))) |
| 10309 | return -EFAULT; |
| 10310 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { |
| 10311 | if (p.resv[i]) |
| 10312 | return -EINVAL; |
| 10313 | } |
| 10314 | |
Jens Axboe | 6c271ce | 2019-01-10 11:22:30 -0700 | [diff] [blame] | 10315 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
Jens Axboe | 8110c1a | 2019-12-28 15:39:54 -0700 | [diff] [blame] | 10316 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 10317 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
| 10318 | IORING_SETUP_R_DISABLED)) |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10319 | return -EINVAL; |
| 10320 | |
Xiaoguang Wang | 7f13657 | 2020-05-05 16:28:53 +0800 | [diff] [blame] | 10321 | return io_uring_create(entries, &p, params); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10322 | } |
| 10323 | |
| 10324 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, |
| 10325 | struct io_uring_params __user *, params) |
| 10326 | { |
| 10327 | return io_uring_setup(entries, params); |
| 10328 | } |
| 10329 | |
Jens Axboe | 66f4af9 | 2020-01-16 15:36:52 -0700 | [diff] [blame] | 10330 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
| 10331 | { |
| 10332 | struct io_uring_probe *p; |
| 10333 | size_t size; |
| 10334 | int i, ret; |
| 10335 | |
| 10336 | size = struct_size(p, ops, nr_args); |
| 10337 | if (size == SIZE_MAX) |
| 10338 | return -EOVERFLOW; |
| 10339 | p = kzalloc(size, GFP_KERNEL); |
| 10340 | if (!p) |
| 10341 | return -ENOMEM; |
| 10342 | |
| 10343 | ret = -EFAULT; |
| 10344 | if (copy_from_user(p, arg, size)) |
| 10345 | goto out; |
| 10346 | ret = -EINVAL; |
| 10347 | if (memchr_inv(p, 0, size)) |
| 10348 | goto out; |
| 10349 | |
| 10350 | p->last_op = IORING_OP_LAST - 1; |
| 10351 | if (nr_args > IORING_OP_LAST) |
| 10352 | nr_args = IORING_OP_LAST; |
| 10353 | |
| 10354 | for (i = 0; i < nr_args; i++) { |
| 10355 | p->ops[i].op = i; |
| 10356 | if (!io_op_defs[i].not_supported) |
| 10357 | p->ops[i].flags = IO_URING_OP_SUPPORTED; |
| 10358 | } |
| 10359 | p->ops_len = i; |
| 10360 | |
| 10361 | ret = 0; |
| 10362 | if (copy_to_user(arg, p, size)) |
| 10363 | ret = -EFAULT; |
| 10364 | out: |
| 10365 | kfree(p); |
| 10366 | return ret; |
| 10367 | } |
| 10368 | |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 10369 | static int io_register_personality(struct io_ring_ctx *ctx) |
| 10370 | { |
Jens Axboe | 4379bf8 | 2021-02-15 13:40:22 -0700 | [diff] [blame] | 10371 | const struct cred *creds; |
Matthew Wilcox (Oracle) | 61cf937 | 2021-03-08 14:16:16 +0000 | [diff] [blame] | 10372 | u32 id; |
Jens Axboe | 1e6fa52 | 2020-10-15 08:46:24 -0600 | [diff] [blame] | 10373 | int ret; |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 10374 | |
Jens Axboe | 4379bf8 | 2021-02-15 13:40:22 -0700 | [diff] [blame] | 10375 | creds = get_current_cred(); |
Jens Axboe | 1e6fa52 | 2020-10-15 08:46:24 -0600 | [diff] [blame] | 10376 | |
Matthew Wilcox (Oracle) | 61cf937 | 2021-03-08 14:16:16 +0000 | [diff] [blame] | 10377 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
| 10378 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); |
Jens Axboe | a30f895 | 2021-08-20 14:53:59 -0600 | [diff] [blame] | 10379 | if (ret < 0) { |
| 10380 | put_cred(creds); |
| 10381 | return ret; |
| 10382 | } |
| 10383 | return id; |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 10384 | } |
| 10385 | |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 10386 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
| 10387 | unsigned int nr_args) |
| 10388 | { |
| 10389 | struct io_uring_restriction *res; |
| 10390 | size_t size; |
| 10391 | int i, ret; |
| 10392 | |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 10393 | /* Restrictions allowed only if rings started disabled */ |
| 10394 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) |
| 10395 | return -EBADFD; |
| 10396 | |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 10397 | /* We allow only a single restrictions registration */ |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 10398 | if (ctx->restrictions.registered) |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 10399 | return -EBUSY; |
| 10400 | |
| 10401 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) |
| 10402 | return -EINVAL; |
| 10403 | |
| 10404 | size = array_size(nr_args, sizeof(*res)); |
| 10405 | if (size == SIZE_MAX) |
| 10406 | return -EOVERFLOW; |
| 10407 | |
| 10408 | res = memdup_user(arg, size); |
| 10409 | if (IS_ERR(res)) |
| 10410 | return PTR_ERR(res); |
| 10411 | |
| 10412 | ret = 0; |
| 10413 | |
| 10414 | for (i = 0; i < nr_args; i++) { |
| 10415 | switch (res[i].opcode) { |
| 10416 | case IORING_RESTRICTION_REGISTER_OP: |
| 10417 | if (res[i].register_op >= IORING_REGISTER_LAST) { |
| 10418 | ret = -EINVAL; |
| 10419 | goto out; |
| 10420 | } |
| 10421 | |
| 10422 | __set_bit(res[i].register_op, |
| 10423 | ctx->restrictions.register_op); |
| 10424 | break; |
| 10425 | case IORING_RESTRICTION_SQE_OP: |
| 10426 | if (res[i].sqe_op >= IORING_OP_LAST) { |
| 10427 | ret = -EINVAL; |
| 10428 | goto out; |
| 10429 | } |
| 10430 | |
| 10431 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); |
| 10432 | break; |
| 10433 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: |
| 10434 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; |
| 10435 | break; |
| 10436 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: |
| 10437 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; |
| 10438 | break; |
| 10439 | default: |
| 10440 | ret = -EINVAL; |
| 10441 | goto out; |
| 10442 | } |
| 10443 | } |
| 10444 | |
| 10445 | out: |
| 10446 | /* Reset all restrictions if an error happened */ |
| 10447 | if (ret != 0) |
| 10448 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); |
| 10449 | else |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 10450 | ctx->restrictions.registered = true; |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 10451 | |
| 10452 | kfree(res); |
| 10453 | return ret; |
| 10454 | } |
| 10455 | |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 10456 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
| 10457 | { |
| 10458 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) |
| 10459 | return -EBADFD; |
| 10460 | |
| 10461 | if (ctx->restrictions.registered) |
| 10462 | ctx->restricted = 1; |
| 10463 | |
Pavel Begunkov | 0298ef9 | 2021-03-08 13:20:57 +0000 | [diff] [blame] | 10464 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
| 10465 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) |
| 10466 | wake_up(&ctx->sq_data->wait); |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 10467 | return 0; |
| 10468 | } |
| 10469 | |
Pavel Begunkov | fdecb66 | 2021-04-25 14:32:20 +0100 | [diff] [blame] | 10470 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 10471 | struct io_uring_rsrc_update2 *up, |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 10472 | unsigned nr_args) |
| 10473 | { |
| 10474 | __u32 tmp; |
| 10475 | int err; |
| 10476 | |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 10477 | if (up->resv) |
| 10478 | return -EINVAL; |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 10479 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
| 10480 | return -EOVERFLOW; |
| 10481 | err = io_rsrc_node_switch_start(ctx); |
| 10482 | if (err) |
| 10483 | return err; |
| 10484 | |
Pavel Begunkov | fdecb66 | 2021-04-25 14:32:20 +0100 | [diff] [blame] | 10485 | switch (type) { |
| 10486 | case IORING_RSRC_FILE: |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 10487 | return __io_sqe_files_update(ctx, up, nr_args); |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 10488 | case IORING_RSRC_BUFFER: |
| 10489 | return __io_sqe_buffers_update(ctx, up, nr_args); |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 10490 | } |
| 10491 | return -EINVAL; |
| 10492 | } |
| 10493 | |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 10494 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
| 10495 | unsigned nr_args) |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 10496 | { |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 10497 | struct io_uring_rsrc_update2 up; |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 10498 | |
| 10499 | if (!nr_args) |
| 10500 | return -EINVAL; |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 10501 | memset(&up, 0, sizeof(up)); |
| 10502 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) |
| 10503 | return -EFAULT; |
| 10504 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); |
| 10505 | } |
| 10506 | |
| 10507 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, |
Pavel Begunkov | 992da01 | 2021-06-10 16:37:37 +0100 | [diff] [blame] | 10508 | unsigned size, unsigned type) |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 10509 | { |
| 10510 | struct io_uring_rsrc_update2 up; |
| 10511 | |
| 10512 | if (size != sizeof(up)) |
| 10513 | return -EINVAL; |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 10514 | if (copy_from_user(&up, arg, sizeof(up))) |
| 10515 | return -EFAULT; |
Pavel Begunkov | 992da01 | 2021-06-10 16:37:37 +0100 | [diff] [blame] | 10516 | if (!up.nr || up.resv) |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 10517 | return -EINVAL; |
Pavel Begunkov | 992da01 | 2021-06-10 16:37:37 +0100 | [diff] [blame] | 10518 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
Pavel Begunkov | 98f0b3b | 2021-04-25 14:32:19 +0100 | [diff] [blame] | 10519 | } |
| 10520 | |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 10521 | static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
Pavel Begunkov | 992da01 | 2021-06-10 16:37:37 +0100 | [diff] [blame] | 10522 | unsigned int size, unsigned int type) |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 10523 | { |
| 10524 | struct io_uring_rsrc_register rr; |
| 10525 | |
| 10526 | /* keep it extendible */ |
| 10527 | if (size != sizeof(rr)) |
| 10528 | return -EINVAL; |
| 10529 | |
| 10530 | memset(&rr, 0, sizeof(rr)); |
| 10531 | if (copy_from_user(&rr, arg, size)) |
| 10532 | return -EFAULT; |
Pavel Begunkov | 992da01 | 2021-06-10 16:37:37 +0100 | [diff] [blame] | 10533 | if (!rr.nr || rr.resv || rr.resv2) |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 10534 | return -EINVAL; |
| 10535 | |
Pavel Begunkov | 992da01 | 2021-06-10 16:37:37 +0100 | [diff] [blame] | 10536 | switch (type) { |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 10537 | case IORING_RSRC_FILE: |
| 10538 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), |
| 10539 | rr.nr, u64_to_user_ptr(rr.tags)); |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 10540 | case IORING_RSRC_BUFFER: |
| 10541 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), |
| 10542 | rr.nr, u64_to_user_ptr(rr.tags)); |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 10543 | } |
| 10544 | return -EINVAL; |
| 10545 | } |
| 10546 | |
Jens Axboe | fe76421 | 2021-06-17 10:19:54 -0600 | [diff] [blame] | 10547 | static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg, |
| 10548 | unsigned len) |
| 10549 | { |
| 10550 | struct io_uring_task *tctx = current->io_uring; |
| 10551 | cpumask_var_t new_mask; |
| 10552 | int ret; |
| 10553 | |
| 10554 | if (!tctx || !tctx->io_wq) |
| 10555 | return -EINVAL; |
| 10556 | |
| 10557 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) |
| 10558 | return -ENOMEM; |
| 10559 | |
| 10560 | cpumask_clear(new_mask); |
| 10561 | if (len > cpumask_size()) |
| 10562 | len = cpumask_size(); |
| 10563 | |
| 10564 | if (copy_from_user(new_mask, arg, len)) { |
| 10565 | free_cpumask_var(new_mask); |
| 10566 | return -EFAULT; |
| 10567 | } |
| 10568 | |
| 10569 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); |
| 10570 | free_cpumask_var(new_mask); |
| 10571 | return ret; |
| 10572 | } |
| 10573 | |
| 10574 | static int io_unregister_iowq_aff(struct io_ring_ctx *ctx) |
| 10575 | { |
| 10576 | struct io_uring_task *tctx = current->io_uring; |
| 10577 | |
| 10578 | if (!tctx || !tctx->io_wq) |
| 10579 | return -EINVAL; |
| 10580 | |
| 10581 | return io_wq_cpu_affinity(tctx->io_wq, NULL); |
| 10582 | } |
| 10583 | |
Jens Axboe | 2e48005 | 2021-08-27 11:33:19 -0600 | [diff] [blame] | 10584 | static int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
| 10585 | void __user *arg) |
| 10586 | { |
Jens Axboe | fa84693 | 2021-09-01 14:15:59 -0600 | [diff] [blame] | 10587 | struct io_uring_task *tctx = NULL; |
| 10588 | struct io_sq_data *sqd = NULL; |
Jens Axboe | 2e48005 | 2021-08-27 11:33:19 -0600 | [diff] [blame] | 10589 | __u32 new_count[2]; |
| 10590 | int i, ret; |
| 10591 | |
Jens Axboe | 2e48005 | 2021-08-27 11:33:19 -0600 | [diff] [blame] | 10592 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
| 10593 | return -EFAULT; |
| 10594 | for (i = 0; i < ARRAY_SIZE(new_count); i++) |
| 10595 | if (new_count[i] > INT_MAX) |
| 10596 | return -EINVAL; |
| 10597 | |
Jens Axboe | fa84693 | 2021-09-01 14:15:59 -0600 | [diff] [blame] | 10598 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
| 10599 | sqd = ctx->sq_data; |
| 10600 | if (sqd) { |
Jens Axboe | 009ad9f | 2021-09-08 19:07:26 -0600 | [diff] [blame] | 10601 | /* |
| 10602 | * Observe the correct sqd->lock -> ctx->uring_lock |
| 10603 | * ordering. Fine to drop uring_lock here, we hold |
| 10604 | * a ref to the ctx. |
| 10605 | */ |
| 10606 | mutex_unlock(&ctx->uring_lock); |
Jens Axboe | fa84693 | 2021-09-01 14:15:59 -0600 | [diff] [blame] | 10607 | mutex_lock(&sqd->lock); |
Jens Axboe | 009ad9f | 2021-09-08 19:07:26 -0600 | [diff] [blame] | 10608 | mutex_lock(&ctx->uring_lock); |
Jens Axboe | fa84693 | 2021-09-01 14:15:59 -0600 | [diff] [blame] | 10609 | tctx = sqd->thread->io_uring; |
| 10610 | } |
| 10611 | } else { |
| 10612 | tctx = current->io_uring; |
| 10613 | } |
| 10614 | |
| 10615 | ret = -EINVAL; |
| 10616 | if (!tctx || !tctx->io_wq) |
| 10617 | goto err; |
| 10618 | |
Jens Axboe | 2e48005 | 2021-08-27 11:33:19 -0600 | [diff] [blame] | 10619 | ret = io_wq_max_workers(tctx->io_wq, new_count); |
| 10620 | if (ret) |
Jens Axboe | fa84693 | 2021-09-01 14:15:59 -0600 | [diff] [blame] | 10621 | goto err; |
| 10622 | |
| 10623 | if (sqd) |
| 10624 | mutex_unlock(&sqd->lock); |
Jens Axboe | 2e48005 | 2021-08-27 11:33:19 -0600 | [diff] [blame] | 10625 | |
| 10626 | if (copy_to_user(arg, new_count, sizeof(new_count))) |
| 10627 | return -EFAULT; |
| 10628 | |
| 10629 | return 0; |
Jens Axboe | fa84693 | 2021-09-01 14:15:59 -0600 | [diff] [blame] | 10630 | err: |
| 10631 | if (sqd) |
| 10632 | mutex_unlock(&sqd->lock); |
| 10633 | return ret; |
Jens Axboe | 2e48005 | 2021-08-27 11:33:19 -0600 | [diff] [blame] | 10634 | } |
| 10635 | |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 10636 | static bool io_register_op_must_quiesce(int op) |
| 10637 | { |
| 10638 | switch (op) { |
Bijan Mottahedeh | bd54b6f | 2021-04-25 14:32:25 +0100 | [diff] [blame] | 10639 | case IORING_REGISTER_BUFFERS: |
| 10640 | case IORING_UNREGISTER_BUFFERS: |
Pavel Begunkov | f4f7d21 | 2021-04-01 15:44:02 +0100 | [diff] [blame] | 10641 | case IORING_REGISTER_FILES: |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 10642 | case IORING_UNREGISTER_FILES: |
| 10643 | case IORING_REGISTER_FILES_UPDATE: |
| 10644 | case IORING_REGISTER_PROBE: |
| 10645 | case IORING_REGISTER_PERSONALITY: |
| 10646 | case IORING_UNREGISTER_PERSONALITY: |
Pavel Begunkov | 992da01 | 2021-06-10 16:37:37 +0100 | [diff] [blame] | 10647 | case IORING_REGISTER_FILES2: |
| 10648 | case IORING_REGISTER_FILES_UPDATE2: |
| 10649 | case IORING_REGISTER_BUFFERS2: |
| 10650 | case IORING_REGISTER_BUFFERS_UPDATE: |
Jens Axboe | fe76421 | 2021-06-17 10:19:54 -0600 | [diff] [blame] | 10651 | case IORING_REGISTER_IOWQ_AFF: |
| 10652 | case IORING_UNREGISTER_IOWQ_AFF: |
Jens Axboe | 2e48005 | 2021-08-27 11:33:19 -0600 | [diff] [blame] | 10653 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 10654 | return false; |
| 10655 | default: |
| 10656 | return true; |
| 10657 | } |
| 10658 | } |
| 10659 | |
Pavel Begunkov | e73c5c7 | 2021-08-09 13:04:12 +0100 | [diff] [blame] | 10660 | static int io_ctx_quiesce(struct io_ring_ctx *ctx) |
| 10661 | { |
| 10662 | long ret; |
| 10663 | |
| 10664 | percpu_ref_kill(&ctx->refs); |
| 10665 | |
| 10666 | /* |
| 10667 | * Drop uring mutex before waiting for references to exit. If another |
| 10668 | * thread is currently inside io_uring_enter() it might need to grab the |
| 10669 | * uring_lock to make progress. If we hold it here across the drain |
| 10670 | * wait, then we can deadlock. It's safe to drop the mutex here, since |
| 10671 | * no new references will come in after we've killed the percpu ref. |
| 10672 | */ |
| 10673 | mutex_unlock(&ctx->uring_lock); |
| 10674 | do { |
| 10675 | ret = wait_for_completion_interruptible(&ctx->ref_comp); |
| 10676 | if (!ret) |
| 10677 | break; |
| 10678 | ret = io_run_task_work_sig(); |
| 10679 | } while (ret >= 0); |
| 10680 | mutex_lock(&ctx->uring_lock); |
| 10681 | |
| 10682 | if (ret) |
| 10683 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); |
| 10684 | return ret; |
| 10685 | } |
| 10686 | |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 10687 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
| 10688 | void __user *arg, unsigned nr_args) |
Jens Axboe | b19062a | 2019-04-15 10:49:38 -0600 | [diff] [blame] | 10689 | __releases(ctx->uring_lock) |
| 10690 | __acquires(ctx->uring_lock) |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 10691 | { |
| 10692 | int ret; |
| 10693 | |
Jens Axboe | 35fa71a | 2019-04-22 10:23:23 -0600 | [diff] [blame] | 10694 | /* |
| 10695 | * We're inside the ring mutex, if the ref is already dying, then |
| 10696 | * someone else killed the ctx or is already going through |
| 10697 | * io_uring_register(). |
| 10698 | */ |
| 10699 | if (percpu_ref_is_dying(&ctx->refs)) |
| 10700 | return -ENXIO; |
| 10701 | |
Pavel Begunkov | 75c4021 | 2021-04-15 13:07:40 +0100 | [diff] [blame] | 10702 | if (ctx->restricted) { |
| 10703 | if (opcode >= IORING_REGISTER_LAST) |
| 10704 | return -EINVAL; |
| 10705 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); |
| 10706 | if (!test_bit(opcode, ctx->restrictions.register_op)) |
| 10707 | return -EACCES; |
| 10708 | } |
| 10709 | |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 10710 | if (io_register_op_must_quiesce(opcode)) { |
Pavel Begunkov | e73c5c7 | 2021-08-09 13:04:12 +0100 | [diff] [blame] | 10711 | ret = io_ctx_quiesce(ctx); |
| 10712 | if (ret) |
Pavel Begunkov | f70865d | 2021-04-11 01:46:40 +0100 | [diff] [blame] | 10713 | return ret; |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 10714 | } |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 10715 | |
| 10716 | switch (opcode) { |
| 10717 | case IORING_REGISTER_BUFFERS: |
Pavel Begunkov | 634d00d | 2021-04-25 14:32:26 +0100 | [diff] [blame] | 10718 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 10719 | break; |
| 10720 | case IORING_UNREGISTER_BUFFERS: |
| 10721 | ret = -EINVAL; |
| 10722 | if (arg || nr_args) |
| 10723 | break; |
Bijan Mottahedeh | 0a96bbe | 2021-01-06 12:39:10 -0800 | [diff] [blame] | 10724 | ret = io_sqe_buffers_unregister(ctx); |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 10725 | break; |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 10726 | case IORING_REGISTER_FILES: |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 10727 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
Jens Axboe | 6b06314 | 2019-01-10 22:13:58 -0700 | [diff] [blame] | 10728 | break; |
| 10729 | case IORING_UNREGISTER_FILES: |
| 10730 | ret = -EINVAL; |
| 10731 | if (arg || nr_args) |
| 10732 | break; |
| 10733 | ret = io_sqe_files_unregister(ctx); |
| 10734 | break; |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 10735 | case IORING_REGISTER_FILES_UPDATE: |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 10736 | ret = io_register_files_update(ctx, arg, nr_args); |
Jens Axboe | c3a31e6 | 2019-10-03 13:59:56 -0600 | [diff] [blame] | 10737 | break; |
Jens Axboe | 9b40284 | 2019-04-11 11:45:41 -0600 | [diff] [blame] | 10738 | case IORING_REGISTER_EVENTFD: |
Jens Axboe | f2842ab | 2020-01-08 11:04:00 -0700 | [diff] [blame] | 10739 | case IORING_REGISTER_EVENTFD_ASYNC: |
Jens Axboe | 9b40284 | 2019-04-11 11:45:41 -0600 | [diff] [blame] | 10740 | ret = -EINVAL; |
| 10741 | if (nr_args != 1) |
| 10742 | break; |
| 10743 | ret = io_eventfd_register(ctx, arg); |
Jens Axboe | f2842ab | 2020-01-08 11:04:00 -0700 | [diff] [blame] | 10744 | if (ret) |
| 10745 | break; |
| 10746 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) |
| 10747 | ctx->eventfd_async = 1; |
| 10748 | else |
| 10749 | ctx->eventfd_async = 0; |
Jens Axboe | 9b40284 | 2019-04-11 11:45:41 -0600 | [diff] [blame] | 10750 | break; |
| 10751 | case IORING_UNREGISTER_EVENTFD: |
| 10752 | ret = -EINVAL; |
| 10753 | if (arg || nr_args) |
| 10754 | break; |
| 10755 | ret = io_eventfd_unregister(ctx); |
| 10756 | break; |
Jens Axboe | 66f4af9 | 2020-01-16 15:36:52 -0700 | [diff] [blame] | 10757 | case IORING_REGISTER_PROBE: |
| 10758 | ret = -EINVAL; |
| 10759 | if (!arg || nr_args > 256) |
| 10760 | break; |
| 10761 | ret = io_probe(ctx, arg, nr_args); |
| 10762 | break; |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 10763 | case IORING_REGISTER_PERSONALITY: |
| 10764 | ret = -EINVAL; |
| 10765 | if (arg || nr_args) |
| 10766 | break; |
| 10767 | ret = io_register_personality(ctx); |
| 10768 | break; |
| 10769 | case IORING_UNREGISTER_PERSONALITY: |
| 10770 | ret = -EINVAL; |
| 10771 | if (arg) |
| 10772 | break; |
| 10773 | ret = io_unregister_personality(ctx, nr_args); |
| 10774 | break; |
Stefano Garzarella | 7e84e1c | 2020-08-27 16:58:31 +0200 | [diff] [blame] | 10775 | case IORING_REGISTER_ENABLE_RINGS: |
| 10776 | ret = -EINVAL; |
| 10777 | if (arg || nr_args) |
| 10778 | break; |
| 10779 | ret = io_register_enable_rings(ctx); |
| 10780 | break; |
Stefano Garzarella | 21b55db | 2020-08-27 16:58:30 +0200 | [diff] [blame] | 10781 | case IORING_REGISTER_RESTRICTIONS: |
| 10782 | ret = io_register_restrictions(ctx, arg, nr_args); |
| 10783 | break; |
Pavel Begunkov | 992da01 | 2021-06-10 16:37:37 +0100 | [diff] [blame] | 10784 | case IORING_REGISTER_FILES2: |
| 10785 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); |
Pavel Begunkov | 792e358 | 2021-04-25 14:32:21 +0100 | [diff] [blame] | 10786 | break; |
Pavel Begunkov | 992da01 | 2021-06-10 16:37:37 +0100 | [diff] [blame] | 10787 | case IORING_REGISTER_FILES_UPDATE2: |
| 10788 | ret = io_register_rsrc_update(ctx, arg, nr_args, |
| 10789 | IORING_RSRC_FILE); |
| 10790 | break; |
| 10791 | case IORING_REGISTER_BUFFERS2: |
| 10792 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); |
| 10793 | break; |
| 10794 | case IORING_REGISTER_BUFFERS_UPDATE: |
| 10795 | ret = io_register_rsrc_update(ctx, arg, nr_args, |
| 10796 | IORING_RSRC_BUFFER); |
Pavel Begunkov | c3bdad0 | 2021-04-25 14:32:22 +0100 | [diff] [blame] | 10797 | break; |
Jens Axboe | fe76421 | 2021-06-17 10:19:54 -0600 | [diff] [blame] | 10798 | case IORING_REGISTER_IOWQ_AFF: |
| 10799 | ret = -EINVAL; |
| 10800 | if (!arg || !nr_args) |
| 10801 | break; |
| 10802 | ret = io_register_iowq_aff(ctx, arg, nr_args); |
| 10803 | break; |
| 10804 | case IORING_UNREGISTER_IOWQ_AFF: |
| 10805 | ret = -EINVAL; |
| 10806 | if (arg || nr_args) |
| 10807 | break; |
| 10808 | ret = io_unregister_iowq_aff(ctx); |
| 10809 | break; |
Jens Axboe | 2e48005 | 2021-08-27 11:33:19 -0600 | [diff] [blame] | 10810 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
| 10811 | ret = -EINVAL; |
| 10812 | if (!arg || nr_args != 2) |
| 10813 | break; |
| 10814 | ret = io_register_iowq_max_workers(ctx, arg); |
| 10815 | break; |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 10816 | default: |
| 10817 | ret = -EINVAL; |
| 10818 | break; |
| 10819 | } |
| 10820 | |
Jens Axboe | 071698e | 2020-01-28 10:04:42 -0700 | [diff] [blame] | 10821 | if (io_register_op_must_quiesce(opcode)) { |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 10822 | /* bring the ctx back to life */ |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 10823 | percpu_ref_reinit(&ctx->refs); |
Jens Axboe | 0f158b4 | 2020-05-14 17:18:39 -0600 | [diff] [blame] | 10824 | reinit_completion(&ctx->ref_comp); |
Jens Axboe | 05f3fb3 | 2019-12-09 11:22:50 -0700 | [diff] [blame] | 10825 | } |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 10826 | return ret; |
| 10827 | } |
| 10828 | |
| 10829 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, |
| 10830 | void __user *, arg, unsigned int, nr_args) |
| 10831 | { |
| 10832 | struct io_ring_ctx *ctx; |
| 10833 | long ret = -EBADF; |
| 10834 | struct fd f; |
| 10835 | |
| 10836 | f = fdget(fd); |
| 10837 | if (!f.file) |
| 10838 | return -EBADF; |
| 10839 | |
| 10840 | ret = -EOPNOTSUPP; |
| 10841 | if (f.file->f_op != &io_uring_fops) |
| 10842 | goto out_fput; |
| 10843 | |
| 10844 | ctx = f.file->private_data; |
| 10845 | |
Pavel Begunkov | b6c23dd | 2021-02-20 15:17:18 +0000 | [diff] [blame] | 10846 | io_run_task_work(); |
| 10847 | |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 10848 | mutex_lock(&ctx->uring_lock); |
| 10849 | ret = __io_uring_register(ctx, opcode, arg, nr_args); |
| 10850 | mutex_unlock(&ctx->uring_lock); |
Dmitrii Dolgov | c826bd7 | 2019-10-15 19:02:01 +0200 | [diff] [blame] | 10851 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
| 10852 | ctx->cq_ev_fd != NULL, ret); |
Jens Axboe | edafcce | 2019-01-09 09:16:05 -0700 | [diff] [blame] | 10853 | out_fput: |
| 10854 | fdput(f); |
| 10855 | return ret; |
| 10856 | } |
| 10857 | |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10858 | static int __init io_uring_init(void) |
| 10859 | { |
Stefan Metzmacher | d7f62e8 | 2020-01-29 14:39:41 +0100 | [diff] [blame] | 10860 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
| 10861 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ |
| 10862 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ |
| 10863 | } while (0) |
| 10864 | |
| 10865 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ |
| 10866 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) |
| 10867 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); |
| 10868 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); |
| 10869 | BUILD_BUG_SQE_ELEM(1, __u8, flags); |
| 10870 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); |
| 10871 | BUILD_BUG_SQE_ELEM(4, __s32, fd); |
| 10872 | BUILD_BUG_SQE_ELEM(8, __u64, off); |
| 10873 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); |
| 10874 | BUILD_BUG_SQE_ELEM(16, __u64, addr); |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 10875 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
Stefan Metzmacher | d7f62e8 | 2020-01-29 14:39:41 +0100 | [diff] [blame] | 10876 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
| 10877 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); |
| 10878 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); |
| 10879 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); |
| 10880 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); |
Jiufei Xue | 5769a35 | 2020-06-17 17:53:55 +0800 | [diff] [blame] | 10881 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
| 10882 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); |
Stefan Metzmacher | d7f62e8 | 2020-01-29 14:39:41 +0100 | [diff] [blame] | 10883 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
| 10884 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); |
| 10885 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); |
| 10886 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); |
| 10887 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); |
| 10888 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); |
| 10889 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); |
| 10890 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 10891 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
Stefan Metzmacher | d7f62e8 | 2020-01-29 14:39:41 +0100 | [diff] [blame] | 10892 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
| 10893 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); |
Pavel Begunkov | 16340ea | 2021-06-24 15:09:58 +0100 | [diff] [blame] | 10894 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
Stefan Metzmacher | d7f62e8 | 2020-01-29 14:39:41 +0100 | [diff] [blame] | 10895 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
Pavel Begunkov | 7d67af2 | 2020-02-24 11:32:45 +0300 | [diff] [blame] | 10896 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
Pavel Begunkov | b944559 | 2021-08-25 12:25:45 +0100 | [diff] [blame] | 10897 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
Stefan Metzmacher | d7f62e8 | 2020-01-29 14:39:41 +0100 | [diff] [blame] | 10898 | |
Pavel Begunkov | b0d658ec | 2021-04-27 16:13:53 +0100 | [diff] [blame] | 10899 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
| 10900 | sizeof(struct io_uring_rsrc_update)); |
| 10901 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > |
| 10902 | sizeof(struct io_uring_rsrc_update2)); |
Pavel Begunkov | 90499ad | 2021-08-25 20:51:40 +0100 | [diff] [blame] | 10903 | |
| 10904 | /* ->buf_index is u16 */ |
| 10905 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); |
| 10906 | |
Pavel Begunkov | b0d658ec | 2021-04-27 16:13:53 +0100 | [diff] [blame] | 10907 | /* should fit into one byte */ |
| 10908 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); |
| 10909 | |
Jens Axboe | d365634 | 2019-12-18 09:50:26 -0700 | [diff] [blame] | 10910 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
Hao Xu | 32c2d33 | 2021-09-07 11:22:43 +0800 | [diff] [blame] | 10911 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
Pavel Begunkov | 16340ea | 2021-06-24 15:09:58 +0100 | [diff] [blame] | 10912 | |
Jens Axboe | 91f245d | 2021-02-09 13:48:50 -0700 | [diff] [blame] | 10913 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
| 10914 | SLAB_ACCOUNT); |
Jens Axboe | 2b188cc | 2019-01-07 10:46:33 -0700 | [diff] [blame] | 10915 | return 0; |
| 10916 | }; |
| 10917 | __initcall(io_uring_init); |