Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * This file is released under the GPL. |
| 6 | */ |
| 7 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 8 | #include "dm-core.h" |
| 9 | #include "dm-rq.h" |
Mike Anderson | 51e5b2b | 2007-10-19 22:48:00 +0100 | [diff] [blame] | 10 | #include "dm-uevent.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 14 | #include <linux/mutex.h> |
Mikulas Patocka | 6958c1c | 2020-07-08 12:25:20 -0400 | [diff] [blame] | 15 | #include <linux/sched/mm.h> |
Ingo Molnar | 174cd4b | 2017-02-02 19:15:33 +0100 | [diff] [blame] | 16 | #include <linux/sched/signal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/blkpg.h> |
| 18 | #include <linux/bio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/mempool.h> |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 20 | #include <linux/dax.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/slab.h> |
| 22 | #include <linux/idr.h> |
Dan Williams | 7e026c8 | 2017-05-29 12:57:56 -0700 | [diff] [blame] | 23 | #include <linux/uio.h> |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 24 | #include <linux/hdreg.h> |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 25 | #include <linux/delay.h> |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 26 | #include <linux/wait.h> |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 27 | #include <linux/pr.h> |
Elena Reshetova | b0b4d7c | 2017-10-20 10:37:39 +0300 | [diff] [blame] | 28 | #include <linux/refcount.h> |
Christoph Hellwig | c6a564ff | 2020-03-25 16:48:42 +0100 | [diff] [blame] | 29 | #include <linux/part_stat.h> |
Satya Tangirala | a892c8d | 2020-05-14 00:37:18 +0000 | [diff] [blame] | 30 | #include <linux/blk-crypto.h> |
Li Zefan | 5578213 | 2009-06-09 13:43:05 +0800 | [diff] [blame] | 31 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 32 | #define DM_MSG_PREFIX "core" |
| 33 | |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 34 | /* |
| 35 | * Cookies are numeric values sent with CHANGE and REMOVE |
| 36 | * uevents while resuming, removing or renaming the device. |
| 37 | */ |
| 38 | #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE" |
| 39 | #define DM_COOKIE_LENGTH 24 |
| 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | static const char *_name = DM_NAME; |
| 42 | |
| 43 | static unsigned int major = 0; |
| 44 | static unsigned int _major = 0; |
| 45 | |
Alasdair G Kergon | d15b774 | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 46 | static DEFINE_IDR(_minor_idr); |
| 47 | |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 48 | static DEFINE_SPINLOCK(_minor_lock); |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 49 | |
| 50 | static void do_deferred_remove(struct work_struct *w); |
| 51 | |
| 52 | static DECLARE_WORK(deferred_remove_work, do_deferred_remove); |
| 53 | |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 54 | static struct workqueue_struct *deferred_remove_workqueue; |
| 55 | |
Mikulas Patocka | 93e6442 | 2017-01-16 16:05:59 -0500 | [diff] [blame] | 56 | atomic_t dm_global_event_nr = ATOMIC_INIT(0); |
| 57 | DECLARE_WAIT_QUEUE_HEAD(dm_global_eventq); |
| 58 | |
Mikulas Patocka | 62e0824 | 2017-09-20 07:29:49 -0400 | [diff] [blame] | 59 | void dm_issue_global_event(void) |
| 60 | { |
| 61 | atomic_inc(&dm_global_event_nr); |
| 62 | wake_up(&dm_global_eventq); |
| 63 | } |
| 64 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | /* |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 66 | * One of these is allocated (on-stack) per original bio. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | */ |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 68 | struct clone_info { |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 69 | struct dm_table *map; |
| 70 | struct bio *bio; |
| 71 | struct dm_io *io; |
| 72 | sector_t sector; |
| 73 | unsigned sector_count; |
| 74 | }; |
| 75 | |
| 76 | /* |
| 77 | * One of these is allocated per clone bio. |
| 78 | */ |
| 79 | #define DM_TIO_MAGIC 7282014 |
| 80 | struct dm_target_io { |
| 81 | unsigned magic; |
| 82 | struct dm_io *io; |
| 83 | struct dm_target *ti; |
| 84 | unsigned target_bio_nr; |
| 85 | unsigned *len_ptr; |
| 86 | bool inside_dm_io; |
| 87 | struct bio clone; |
| 88 | }; |
| 89 | |
| 90 | /* |
| 91 | * One of these is allocated per original bio. |
| 92 | * It contains the first clone used for that original. |
| 93 | */ |
| 94 | #define DM_IO_MAGIC 5191977 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | struct dm_io { |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 96 | unsigned magic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | struct mapped_device *md; |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 98 | blk_status_t status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | atomic_t io_count; |
Mike Snitzer | 745dc57 | 2017-12-11 20:51:50 -0500 | [diff] [blame] | 100 | struct bio *orig_bio; |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 101 | unsigned long start_time; |
Kiyoshi Ueda | f88fb98 | 2009-10-16 23:18:15 +0100 | [diff] [blame] | 102 | spinlock_t endio_lock; |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 103 | struct dm_stats_aux stats_aux; |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 104 | /* last member of dm_target_io is 'struct bio' */ |
| 105 | struct dm_target_io tio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | }; |
| 107 | |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 108 | void *dm_per_bio_data(struct bio *bio, size_t data_size) |
| 109 | { |
| 110 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
| 111 | if (!tio->inside_dm_io) |
| 112 | return (char *)bio - offsetof(struct dm_target_io, clone) - data_size; |
| 113 | return (char *)bio - offsetof(struct dm_target_io, clone) - offsetof(struct dm_io, tio) - data_size; |
| 114 | } |
| 115 | EXPORT_SYMBOL_GPL(dm_per_bio_data); |
| 116 | |
| 117 | struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size) |
| 118 | { |
| 119 | struct dm_io *io = (struct dm_io *)((char *)data + data_size); |
| 120 | if (io->magic == DM_IO_MAGIC) |
| 121 | return (struct bio *)((char *)io + offsetof(struct dm_io, tio) + offsetof(struct dm_target_io, clone)); |
| 122 | BUG_ON(io->magic != DM_TIO_MAGIC); |
| 123 | return (struct bio *)((char *)io + offsetof(struct dm_target_io, clone)); |
| 124 | } |
| 125 | EXPORT_SYMBOL_GPL(dm_bio_from_per_bio_data); |
| 126 | |
| 127 | unsigned dm_bio_get_target_bio_nr(const struct bio *bio) |
| 128 | { |
| 129 | return container_of(bio, struct dm_target_io, clone)->target_bio_nr; |
| 130 | } |
| 131 | EXPORT_SYMBOL_GPL(dm_bio_get_target_bio_nr); |
| 132 | |
Jeff Mahoney | ba61fdd | 2006-06-26 00:27:21 -0700 | [diff] [blame] | 133 | #define MINOR_ALLOCED ((void *)-1) |
| 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | /* |
| 136 | * Bits for the md->flags field. |
| 137 | */ |
Alasdair G Kergon | 1eb787e | 2009-04-09 00:27:14 +0100 | [diff] [blame] | 138 | #define DMF_BLOCK_IO_FOR_SUSPEND 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | #define DMF_SUSPENDED 1 |
Alasdair G Kergon | aa8d7c2 | 2006-01-06 00:20:06 -0800 | [diff] [blame] | 140 | #define DMF_FROZEN 2 |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 141 | #define DMF_FREEING 3 |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 142 | #define DMF_DELETING 4 |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 143 | #define DMF_NOFLUSH_SUSPENDING 5 |
Kent Overstreet | 8ae1266 | 2015-04-27 23:48:34 -0700 | [diff] [blame] | 144 | #define DMF_DEFERRED_REMOVE 6 |
| 145 | #define DMF_SUSPENDED_INTERNALLY 7 |
Mikulas Patocka | 5df96f2 | 2020-07-23 10:42:09 -0400 | [diff] [blame] | 146 | #define DMF_POST_SUSPENDING 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 148 | #define DM_NUMA_NODE NUMA_NO_NODE |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 149 | static int dm_numa_node = DM_NUMA_NODE; |
Mike Snitzer | faad87d | 2016-01-28 16:52:56 -0500 | [diff] [blame] | 150 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 151 | /* |
| 152 | * For mempools pre-allocation at the table loading time. |
| 153 | */ |
| 154 | struct dm_md_mempools { |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 155 | struct bio_set bs; |
| 156 | struct bio_set io_bs; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 157 | }; |
| 158 | |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 159 | struct table_device { |
| 160 | struct list_head list; |
Elena Reshetova | b0b4d7c | 2017-10-20 10:37:39 +0300 | [diff] [blame] | 161 | refcount_t count; |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 162 | struct dm_dev dm_dev; |
| 163 | }; |
| 164 | |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 165 | /* |
Mike Snitzer | e860313 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 166 | * Bio-based DM's mempools' reserved IOs set by the user. |
| 167 | */ |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 168 | #define RESERVED_BIO_BASED_IOS 16 |
Mike Snitzer | e860313 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 169 | static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS; |
| 170 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 171 | static int __dm_get_module_param_int(int *module_param, int min, int max) |
| 172 | { |
Mark Rutland | 6aa7de0 | 2017-10-23 14:07:29 -0700 | [diff] [blame] | 173 | int param = READ_ONCE(*module_param); |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 174 | int modified_param = 0; |
| 175 | bool modified = true; |
| 176 | |
| 177 | if (param < min) |
| 178 | modified_param = min; |
| 179 | else if (param > max) |
| 180 | modified_param = max; |
| 181 | else |
| 182 | modified = false; |
| 183 | |
| 184 | if (modified) { |
| 185 | (void)cmpxchg(module_param, param, modified_param); |
| 186 | param = modified_param; |
| 187 | } |
| 188 | |
| 189 | return param; |
| 190 | } |
| 191 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 192 | unsigned __dm_get_module_param(unsigned *module_param, |
| 193 | unsigned def, unsigned max) |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 194 | { |
Mark Rutland | 6aa7de0 | 2017-10-23 14:07:29 -0700 | [diff] [blame] | 195 | unsigned param = READ_ONCE(*module_param); |
Mike Snitzer | 09c2d53 | 2015-02-27 22:25:26 -0500 | [diff] [blame] | 196 | unsigned modified_param = 0; |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 197 | |
Mike Snitzer | 09c2d53 | 2015-02-27 22:25:26 -0500 | [diff] [blame] | 198 | if (!param) |
| 199 | modified_param = def; |
| 200 | else if (param > max) |
| 201 | modified_param = max; |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 202 | |
Mike Snitzer | 09c2d53 | 2015-02-27 22:25:26 -0500 | [diff] [blame] | 203 | if (modified_param) { |
| 204 | (void)cmpxchg(module_param, param, modified_param); |
| 205 | param = modified_param; |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 206 | } |
| 207 | |
Mike Snitzer | 09c2d53 | 2015-02-27 22:25:26 -0500 | [diff] [blame] | 208 | return param; |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 209 | } |
| 210 | |
Mike Snitzer | e860313 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 211 | unsigned dm_get_reserved_bio_based_ios(void) |
| 212 | { |
Mike Snitzer | 09c2d53 | 2015-02-27 22:25:26 -0500 | [diff] [blame] | 213 | return __dm_get_module_param(&reserved_bio_based_ios, |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 214 | RESERVED_BIO_BASED_IOS, DM_RESERVED_MAX_IOS); |
Mike Snitzer | e860313 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 215 | } |
| 216 | EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios); |
| 217 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 218 | static unsigned dm_get_numa_node(void) |
| 219 | { |
| 220 | return __dm_get_module_param_int(&dm_numa_node, |
| 221 | DM_NUMA_NODE, num_online_nodes() - 1); |
| 222 | } |
| 223 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | static int __init local_init(void) |
| 225 | { |
Mike Snitzer | e689fba | 2019-02-20 15:37:44 -0500 | [diff] [blame] | 226 | int r; |
Mike Snitzer | 1ae49ea | 2014-12-05 17:11:05 -0500 | [diff] [blame] | 227 | |
Mike Anderson | 51e5b2b | 2007-10-19 22:48:00 +0100 | [diff] [blame] | 228 | r = dm_uevent_init(); |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 229 | if (r) |
Mike Snitzer | e689fba | 2019-02-20 15:37:44 -0500 | [diff] [blame] | 230 | return r; |
Mike Anderson | 51e5b2b | 2007-10-19 22:48:00 +0100 | [diff] [blame] | 231 | |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 232 | deferred_remove_workqueue = alloc_workqueue("kdmremove", WQ_UNBOUND, 1); |
| 233 | if (!deferred_remove_workqueue) { |
| 234 | r = -ENOMEM; |
| 235 | goto out_uevent_exit; |
| 236 | } |
| 237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | _major = major; |
| 239 | r = register_blkdev(_major, _name); |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 240 | if (r < 0) |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 241 | goto out_free_workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
| 243 | if (!_major) |
| 244 | _major = r; |
| 245 | |
| 246 | return 0; |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 247 | |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 248 | out_free_workqueue: |
| 249 | destroy_workqueue(deferred_remove_workqueue); |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 250 | out_uevent_exit: |
| 251 | dm_uevent_exit(); |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 252 | |
| 253 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } |
| 255 | |
| 256 | static void local_exit(void) |
| 257 | { |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 258 | flush_scheduled_work(); |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 259 | destroy_workqueue(deferred_remove_workqueue); |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 260 | |
Akinobu Mita | 00d5940 | 2007-07-17 04:03:46 -0700 | [diff] [blame] | 261 | unregister_blkdev(_major, _name); |
Mike Anderson | 51e5b2b | 2007-10-19 22:48:00 +0100 | [diff] [blame] | 262 | dm_uevent_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
| 264 | _major = 0; |
| 265 | |
| 266 | DMINFO("cleaned up"); |
| 267 | } |
| 268 | |
Alasdair G Kergon | b9249e5 | 2008-02-08 02:09:51 +0000 | [diff] [blame] | 269 | static int (*_inits[])(void) __initdata = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | local_init, |
| 271 | dm_target_init, |
| 272 | dm_linear_init, |
| 273 | dm_stripe_init, |
Mikulas Patocka | 952b355 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 274 | dm_io_init, |
Mikulas Patocka | 945fa4d | 2008-04-24 21:43:49 +0100 | [diff] [blame] | 275 | dm_kcopyd_init, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | dm_interface_init, |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 277 | dm_statistics_init, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | }; |
| 279 | |
Alasdair G Kergon | b9249e5 | 2008-02-08 02:09:51 +0000 | [diff] [blame] | 280 | static void (*_exits[])(void) = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | local_exit, |
| 282 | dm_target_exit, |
| 283 | dm_linear_exit, |
| 284 | dm_stripe_exit, |
Mikulas Patocka | 952b355 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 285 | dm_io_exit, |
Mikulas Patocka | 945fa4d | 2008-04-24 21:43:49 +0100 | [diff] [blame] | 286 | dm_kcopyd_exit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | dm_interface_exit, |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 288 | dm_statistics_exit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | }; |
| 290 | |
| 291 | static int __init dm_init(void) |
| 292 | { |
| 293 | const int count = ARRAY_SIZE(_inits); |
| 294 | |
| 295 | int r, i; |
| 296 | |
| 297 | for (i = 0; i < count; i++) { |
| 298 | r = _inits[i](); |
| 299 | if (r) |
| 300 | goto bad; |
| 301 | } |
| 302 | |
| 303 | return 0; |
| 304 | |
| 305 | bad: |
| 306 | while (i--) |
| 307 | _exits[i](); |
| 308 | |
| 309 | return r; |
| 310 | } |
| 311 | |
| 312 | static void __exit dm_exit(void) |
| 313 | { |
| 314 | int i = ARRAY_SIZE(_exits); |
| 315 | |
| 316 | while (i--) |
| 317 | _exits[i](); |
Alasdair G Kergon | d15b774 | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 318 | |
| 319 | /* |
| 320 | * Should be empty by this point. |
| 321 | */ |
Alasdair G Kergon | d15b774 | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 322 | idr_destroy(&_minor_idr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Block device functions |
| 327 | */ |
Mike Anderson | 432a212 | 2009-12-10 23:52:20 +0000 | [diff] [blame] | 328 | int dm_deleting_md(struct mapped_device *md) |
| 329 | { |
| 330 | return test_bit(DMF_DELETING, &md->flags); |
| 331 | } |
| 332 | |
Al Viro | fe5f9f2 | 2008-03-02 10:29:31 -0500 | [diff] [blame] | 333 | static int dm_blk_open(struct block_device *bdev, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | { |
| 335 | struct mapped_device *md; |
| 336 | |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 337 | spin_lock(&_minor_lock); |
| 338 | |
Al Viro | fe5f9f2 | 2008-03-02 10:29:31 -0500 | [diff] [blame] | 339 | md = bdev->bd_disk->private_data; |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 340 | if (!md) |
| 341 | goto out; |
| 342 | |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 343 | if (test_bit(DMF_FREEING, &md->flags) || |
Mike Anderson | 432a212 | 2009-12-10 23:52:20 +0000 | [diff] [blame] | 344 | dm_deleting_md(md)) { |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 345 | md = NULL; |
| 346 | goto out; |
| 347 | } |
| 348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | dm_get(md); |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 350 | atomic_inc(&md->open_count); |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 351 | out: |
| 352 | spin_unlock(&_minor_lock); |
| 353 | |
| 354 | return md ? 0 : -ENXIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 357 | static void dm_blk_close(struct gendisk *disk, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
Mike Snitzer | 63a4f06 | 2015-03-23 17:01:43 -0400 | [diff] [blame] | 359 | struct mapped_device *md; |
Arnd Bergmann | 6e9624b | 2010-08-07 18:25:34 +0200 | [diff] [blame] | 360 | |
Milan Broz | 4a1aeb9 | 2011-01-13 19:59:48 +0000 | [diff] [blame] | 361 | spin_lock(&_minor_lock); |
| 362 | |
Mike Snitzer | 63a4f06 | 2015-03-23 17:01:43 -0400 | [diff] [blame] | 363 | md = disk->private_data; |
| 364 | if (WARN_ON(!md)) |
| 365 | goto out; |
| 366 | |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 367 | if (atomic_dec_and_test(&md->open_count) && |
| 368 | (test_bit(DMF_DEFERRED_REMOVE, &md->flags))) |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 369 | queue_work(deferred_remove_workqueue, &deferred_remove_work); |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | dm_put(md); |
Mike Snitzer | 63a4f06 | 2015-03-23 17:01:43 -0400 | [diff] [blame] | 372 | out: |
Milan Broz | 4a1aeb9 | 2011-01-13 19:59:48 +0000 | [diff] [blame] | 373 | spin_unlock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | } |
| 375 | |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 376 | int dm_open_count(struct mapped_device *md) |
| 377 | { |
| 378 | return atomic_read(&md->open_count); |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * Guarantees nothing is using the device before it's deleted. |
| 383 | */ |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 384 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred) |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 385 | { |
| 386 | int r = 0; |
| 387 | |
| 388 | spin_lock(&_minor_lock); |
| 389 | |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 390 | if (dm_open_count(md)) { |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 391 | r = -EBUSY; |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 392 | if (mark_deferred) |
| 393 | set_bit(DMF_DEFERRED_REMOVE, &md->flags); |
| 394 | } else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags)) |
| 395 | r = -EEXIST; |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 396 | else |
| 397 | set_bit(DMF_DELETING, &md->flags); |
| 398 | |
| 399 | spin_unlock(&_minor_lock); |
| 400 | |
| 401 | return r; |
| 402 | } |
| 403 | |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 404 | int dm_cancel_deferred_remove(struct mapped_device *md) |
| 405 | { |
| 406 | int r = 0; |
| 407 | |
| 408 | spin_lock(&_minor_lock); |
| 409 | |
| 410 | if (test_bit(DMF_DELETING, &md->flags)) |
| 411 | r = -EBUSY; |
| 412 | else |
| 413 | clear_bit(DMF_DEFERRED_REMOVE, &md->flags); |
| 414 | |
| 415 | spin_unlock(&_minor_lock); |
| 416 | |
| 417 | return r; |
| 418 | } |
| 419 | |
| 420 | static void do_deferred_remove(struct work_struct *w) |
| 421 | { |
| 422 | dm_deferred_remove(); |
| 423 | } |
| 424 | |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 425 | static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| 426 | { |
| 427 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 428 | |
| 429 | return dm_get_geometry(md, geo); |
| 430 | } |
| 431 | |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 432 | #ifdef CONFIG_BLK_DEV_ZONED |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 433 | int dm_report_zones_cb(struct blk_zone *zone, unsigned int idx, void *data) |
| 434 | { |
| 435 | struct dm_report_zones_args *args = data; |
| 436 | sector_t sector_diff = args->tgt->begin - args->start; |
| 437 | |
| 438 | /* |
| 439 | * Ignore zones beyond the target range. |
| 440 | */ |
| 441 | if (zone->start >= args->start + args->tgt->len) |
| 442 | return 0; |
| 443 | |
| 444 | /* |
| 445 | * Remap the start sector and write pointer position of the zone |
| 446 | * to match its position in the target range. |
| 447 | */ |
| 448 | zone->start += sector_diff; |
| 449 | if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) { |
| 450 | if (zone->cond == BLK_ZONE_COND_FULL) |
| 451 | zone->wp = zone->start + zone->len; |
| 452 | else if (zone->cond == BLK_ZONE_COND_EMPTY) |
| 453 | zone->wp = zone->start; |
| 454 | else |
| 455 | zone->wp += sector_diff; |
| 456 | } |
| 457 | |
| 458 | args->next_sector = zone->start + zone->len; |
| 459 | return args->orig_cb(zone, args->zone_idx++, args->orig_data); |
| 460 | } |
| 461 | EXPORT_SYMBOL_GPL(dm_report_zones_cb); |
| 462 | |
| 463 | static int dm_blk_report_zones(struct gendisk *disk, sector_t sector, |
| 464 | unsigned int nr_zones, report_zones_cb cb, void *data) |
| 465 | { |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 466 | struct mapped_device *md = disk->private_data; |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 467 | struct dm_table *map; |
| 468 | int srcu_idx, ret; |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 469 | struct dm_report_zones_args args = { |
| 470 | .next_sector = sector, |
| 471 | .orig_data = data, |
| 472 | .orig_cb = cb, |
| 473 | }; |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 474 | |
| 475 | if (dm_suspended_md(md)) |
| 476 | return -EAGAIN; |
| 477 | |
| 478 | map = dm_get_live_table(md, &srcu_idx); |
Sergei Shtepa | 8947833 | 2020-11-11 15:55:46 +0300 | [diff] [blame] | 479 | if (!map) { |
| 480 | ret = -EIO; |
| 481 | goto out; |
| 482 | } |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 483 | |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 484 | do { |
| 485 | struct dm_target *tgt; |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 486 | |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 487 | tgt = dm_table_find_target(map, args.next_sector); |
| 488 | if (WARN_ON_ONCE(!tgt->type->report_zones)) { |
| 489 | ret = -EIO; |
| 490 | goto out; |
| 491 | } |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 492 | |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 493 | args.tgt = tgt; |
Johannes Thumshirn | a9cb9f4 | 2020-08-04 18:25:01 +0900 | [diff] [blame] | 494 | ret = tgt->type->report_zones(tgt, &args, |
| 495 | nr_zones - args.zone_idx); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 496 | if (ret < 0) |
| 497 | goto out; |
| 498 | } while (args.zone_idx < nr_zones && |
| 499 | args.next_sector < get_capacity(disk)); |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 500 | |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 501 | ret = args.zone_idx; |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 502 | out: |
| 503 | dm_put_live_table(md, srcu_idx); |
| 504 | return ret; |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 505 | } |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 506 | #else |
| 507 | #define dm_blk_report_zones NULL |
| 508 | #endif /* CONFIG_BLK_DEV_ZONED */ |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 509 | |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 510 | static int dm_prepare_ioctl(struct mapped_device *md, int *srcu_idx, |
Mike Snitzer | 5bd5e8d | 2018-04-03 16:54:10 -0400 | [diff] [blame] | 511 | struct block_device **bdev) |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 512 | { |
Mike Snitzer | 6648202 | 2016-02-18 15:44:39 -0500 | [diff] [blame] | 513 | struct dm_target *tgt; |
Hannes Reinecke | 6c182cd | 2013-07-10 23:41:15 +0100 | [diff] [blame] | 514 | struct dm_table *map; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 515 | int r; |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 516 | |
Hannes Reinecke | 6c182cd | 2013-07-10 23:41:15 +0100 | [diff] [blame] | 517 | retry: |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 518 | r = -ENOTTY; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 519 | map = dm_get_live_table(md, srcu_idx); |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 520 | if (!map || !dm_table_get_size(map)) |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 521 | return r; |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 522 | |
| 523 | /* We only support devices that have a single target */ |
| 524 | if (dm_table_get_num_targets(map) != 1) |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 525 | return r; |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 526 | |
Mike Snitzer | 6648202 | 2016-02-18 15:44:39 -0500 | [diff] [blame] | 527 | tgt = dm_table_get_target(map, 0); |
| 528 | if (!tgt->type->prepare_ioctl) |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 529 | return r; |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 530 | |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 531 | if (dm_suspended_md(md)) |
| 532 | return -EAGAIN; |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 533 | |
Mike Snitzer | 5bd5e8d | 2018-04-03 16:54:10 -0400 | [diff] [blame] | 534 | r = tgt->type->prepare_ioctl(tgt, bdev); |
Junichi Nomura | 5bbbfdf | 2015-11-17 09:39:26 +0000 | [diff] [blame] | 535 | if (r == -ENOTCONN && !fatal_signal_pending(current)) { |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 536 | dm_put_live_table(md, *srcu_idx); |
Hannes Reinecke | 6c182cd | 2013-07-10 23:41:15 +0100 | [diff] [blame] | 537 | msleep(10); |
| 538 | goto retry; |
| 539 | } |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 540 | |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 541 | return r; |
| 542 | } |
Hannes Reinecke | 6c182cd | 2013-07-10 23:41:15 +0100 | [diff] [blame] | 543 | |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 544 | static void dm_unprepare_ioctl(struct mapped_device *md, int srcu_idx) |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 545 | { |
| 546 | dm_put_live_table(md, srcu_idx); |
| 547 | } |
| 548 | |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 549 | static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode, |
| 550 | unsigned int cmd, unsigned long arg) |
| 551 | { |
| 552 | struct mapped_device *md = bdev->bd_disk->private_data; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 553 | int r, srcu_idx; |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 554 | |
Mike Snitzer | 5bd5e8d | 2018-04-03 16:54:10 -0400 | [diff] [blame] | 555 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 556 | if (r < 0) |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 557 | goto out; |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 558 | |
| 559 | if (r > 0) { |
| 560 | /* |
Christoph Hellwig | e980f62 | 2017-02-04 10:45:03 +0100 | [diff] [blame] | 561 | * Target determined this ioctl is being issued against a |
| 562 | * subset of the parent bdev; require extra privileges. |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 563 | */ |
Christoph Hellwig | e980f62 | 2017-02-04 10:45:03 +0100 | [diff] [blame] | 564 | if (!capable(CAP_SYS_RAWIO)) { |
Mike Snitzer | 0378c62 | 2021-01-06 18:19:05 -0500 | [diff] [blame] | 565 | DMDEBUG_LIMIT( |
Christoph Hellwig | e980f62 | 2017-02-04 10:45:03 +0100 | [diff] [blame] | 566 | "%s: sending ioctl %x to DM device without required privilege.", |
| 567 | current->comm, cmd); |
| 568 | r = -ENOIOCTLCMD; |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 569 | goto out; |
Christoph Hellwig | e980f62 | 2017-02-04 10:45:03 +0100 | [diff] [blame] | 570 | } |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 571 | } |
| 572 | |
Christoph Hellwig | a7cb3d2f | 2020-11-03 11:00:18 +0100 | [diff] [blame] | 573 | if (!bdev->bd_disk->fops->ioctl) |
| 574 | r = -ENOTTY; |
| 575 | else |
| 576 | r = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 577 | out: |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 578 | dm_unprepare_ioctl(md, srcu_idx); |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 579 | return r; |
| 580 | } |
| 581 | |
Mike Snitzer | 7465d7a | 2020-09-17 12:59:36 -0400 | [diff] [blame] | 582 | u64 dm_start_time_ns_from_clone(struct bio *bio) |
| 583 | { |
| 584 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
| 585 | struct dm_io *io = tio->io; |
| 586 | |
| 587 | return jiffies_to_nsecs(io->start_time); |
| 588 | } |
| 589 | EXPORT_SYMBOL_GPL(dm_start_time_ns_from_clone); |
| 590 | |
| 591 | static void start_io_acct(struct dm_io *io) |
| 592 | { |
| 593 | struct mapped_device *md = io->md; |
| 594 | struct bio *bio = io->orig_bio; |
| 595 | |
| 596 | io->start_time = bio_start_io_acct(bio); |
| 597 | if (unlikely(dm_stats_used(&md->stats))) |
| 598 | dm_stats_account_io(&md->stats, bio_data_dir(bio), |
| 599 | bio->bi_iter.bi_sector, bio_sectors(bio), |
| 600 | false, 0, &io->stats_aux); |
| 601 | } |
| 602 | |
| 603 | static void end_io_acct(struct dm_io *io) |
| 604 | { |
| 605 | struct mapped_device *md = io->md; |
| 606 | struct bio *bio = io->orig_bio; |
| 607 | unsigned long duration = jiffies - io->start_time; |
| 608 | |
| 609 | bio_end_io_acct(bio, io->start_time); |
| 610 | |
| 611 | if (unlikely(dm_stats_used(&md->stats))) |
| 612 | dm_stats_account_io(&md->stats, bio_data_dir(bio), |
| 613 | bio->bi_iter.bi_sector, bio_sectors(bio), |
| 614 | true, duration, &io->stats_aux); |
| 615 | |
| 616 | /* nudge anyone waiting on suspend queue */ |
| 617 | if (unlikely(wq_has_sleeper(&md->wait))) |
| 618 | wake_up(&md->wait); |
| 619 | } |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 620 | |
| 621 | static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | { |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 623 | struct dm_io *io; |
| 624 | struct dm_target_io *tio; |
| 625 | struct bio *clone; |
| 626 | |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 627 | clone = bio_alloc_bioset(GFP_NOIO, 0, &md->io_bs); |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 628 | if (!clone) |
| 629 | return NULL; |
| 630 | |
| 631 | tio = container_of(clone, struct dm_target_io, clone); |
| 632 | tio->inside_dm_io = true; |
| 633 | tio->io = NULL; |
| 634 | |
| 635 | io = container_of(tio, struct dm_io, tio); |
| 636 | io->magic = DM_IO_MAGIC; |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 637 | io->status = 0; |
| 638 | atomic_set(&io->io_count, 1); |
| 639 | io->orig_bio = bio; |
| 640 | io->md = md; |
| 641 | spin_lock_init(&io->endio_lock); |
| 642 | |
| 643 | start_io_acct(io); |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 644 | |
| 645 | return io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | } |
| 647 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 648 | static void free_io(struct mapped_device *md, struct dm_io *io) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | { |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 650 | bio_put(&io->tio.clone); |
| 651 | } |
| 652 | |
| 653 | static struct dm_target_io *alloc_tio(struct clone_info *ci, struct dm_target *ti, |
| 654 | unsigned target_bio_nr, gfp_t gfp_mask) |
| 655 | { |
| 656 | struct dm_target_io *tio; |
| 657 | |
| 658 | if (!ci->io->tio.io) { |
| 659 | /* the dm_target_io embedded in ci->io is available */ |
| 660 | tio = &ci->io->tio; |
| 661 | } else { |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 662 | struct bio *clone = bio_alloc_bioset(gfp_mask, 0, &ci->io->md->bs); |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 663 | if (!clone) |
| 664 | return NULL; |
| 665 | |
| 666 | tio = container_of(clone, struct dm_target_io, clone); |
| 667 | tio->inside_dm_io = false; |
| 668 | } |
| 669 | |
| 670 | tio->magic = DM_TIO_MAGIC; |
| 671 | tio->io = ci->io; |
| 672 | tio->ti = ti; |
| 673 | tio->target_bio_nr = target_bio_nr; |
| 674 | |
| 675 | return tio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
| 677 | |
Mike Snitzer | cfae752 | 2016-04-11 12:05:38 -0400 | [diff] [blame] | 678 | static void free_tio(struct dm_target_io *tio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | { |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 680 | if (tio->inside_dm_io) |
| 681 | return; |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 682 | bio_put(&tio->clone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } |
| 684 | |
| 685 | /* |
| 686 | * Add the bio to the list of deferred io. |
| 687 | */ |
Mikulas Patocka | 92c6390 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 688 | static void queue_io(struct mapped_device *md, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | { |
Kiyoshi Ueda | 05447420 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 690 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
Kiyoshi Ueda | 05447420 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 692 | spin_lock_irqsave(&md->deferred_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | bio_list_add(&md->deferred, bio); |
Kiyoshi Ueda | 05447420 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 694 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 695 | queue_work(md->wq, &md->work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | } |
| 697 | |
| 698 | /* |
| 699 | * Everyone (including functions in this file), should use this |
| 700 | * function to access the md->map field, and make sure they call |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 701 | * dm_put_live_table() when finished. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | */ |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 703 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | { |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 705 | *srcu_idx = srcu_read_lock(&md->io_barrier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 707 | return srcu_dereference(md->map, &md->io_barrier); |
| 708 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 710 | void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier) |
| 711 | { |
| 712 | srcu_read_unlock(&md->io_barrier, srcu_idx); |
| 713 | } |
| 714 | |
| 715 | void dm_sync_table(struct mapped_device *md) |
| 716 | { |
| 717 | synchronize_srcu(&md->io_barrier); |
| 718 | synchronize_rcu_expedited(); |
| 719 | } |
| 720 | |
| 721 | /* |
| 722 | * A fast alternative to dm_get_live_table/dm_put_live_table. |
| 723 | * The caller must not block between these two functions. |
| 724 | */ |
| 725 | static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU) |
| 726 | { |
| 727 | rcu_read_lock(); |
| 728 | return rcu_dereference(md->map); |
| 729 | } |
| 730 | |
| 731 | static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) |
| 732 | { |
| 733 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
| 735 | |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 736 | static char *_dm_claim_ptr = "I belong to device-mapper"; |
| 737 | |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 738 | /* |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 739 | * Open a table device so we can use it as a map destination. |
| 740 | */ |
| 741 | static int open_table_device(struct table_device *td, dev_t dev, |
| 742 | struct mapped_device *md) |
| 743 | { |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 744 | struct block_device *bdev; |
| 745 | |
| 746 | int r; |
| 747 | |
| 748 | BUG_ON(td->dm_dev.bdev); |
| 749 | |
Mike Snitzer | 519049a | 2018-02-22 13:31:20 -0500 | [diff] [blame] | 750 | bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _dm_claim_ptr); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 751 | if (IS_ERR(bdev)) |
| 752 | return PTR_ERR(bdev); |
| 753 | |
| 754 | r = bd_link_disk_holder(bdev, dm_disk(md)); |
| 755 | if (r) { |
| 756 | blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL); |
| 757 | return r; |
| 758 | } |
| 759 | |
| 760 | td->dm_dev.bdev = bdev; |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 761 | td->dm_dev.dax_dev = dax_get_by_host(bdev->bd_disk->disk_name); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 762 | return 0; |
| 763 | } |
| 764 | |
| 765 | /* |
| 766 | * Close a table device that we've been using. |
| 767 | */ |
| 768 | static void close_table_device(struct table_device *td, struct mapped_device *md) |
| 769 | { |
| 770 | if (!td->dm_dev.bdev) |
| 771 | return; |
| 772 | |
| 773 | bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); |
| 774 | blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 775 | put_dax(td->dm_dev.dax_dev); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 776 | td->dm_dev.bdev = NULL; |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 777 | td->dm_dev.dax_dev = NULL; |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 778 | } |
| 779 | |
| 780 | static struct table_device *find_table_device(struct list_head *l, dev_t dev, |
Sheetal Singala | 8454fca | 2019-05-10 23:18:37 +0530 | [diff] [blame] | 781 | fmode_t mode) |
| 782 | { |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 783 | struct table_device *td; |
| 784 | |
| 785 | list_for_each_entry(td, l, list) |
| 786 | if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode) |
| 787 | return td; |
| 788 | |
| 789 | return NULL; |
| 790 | } |
| 791 | |
| 792 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, |
Sheetal Singala | 8454fca | 2019-05-10 23:18:37 +0530 | [diff] [blame] | 793 | struct dm_dev **result) |
| 794 | { |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 795 | int r; |
| 796 | struct table_device *td; |
| 797 | |
| 798 | mutex_lock(&md->table_devices_lock); |
| 799 | td = find_table_device(&md->table_devices, dev, mode); |
| 800 | if (!td) { |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 801 | td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 802 | if (!td) { |
| 803 | mutex_unlock(&md->table_devices_lock); |
| 804 | return -ENOMEM; |
| 805 | } |
| 806 | |
| 807 | td->dm_dev.mode = mode; |
| 808 | td->dm_dev.bdev = NULL; |
| 809 | |
| 810 | if ((r = open_table_device(td, dev, md))) { |
| 811 | mutex_unlock(&md->table_devices_lock); |
| 812 | kfree(td); |
| 813 | return r; |
| 814 | } |
| 815 | |
| 816 | format_dev_t(td->dm_dev.name, dev); |
| 817 | |
Elena Reshetova | b0b4d7c | 2017-10-20 10:37:39 +0300 | [diff] [blame] | 818 | refcount_set(&td->count, 1); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 819 | list_add(&td->list, &md->table_devices); |
Elena Reshetova | b0b4d7c | 2017-10-20 10:37:39 +0300 | [diff] [blame] | 820 | } else { |
| 821 | refcount_inc(&td->count); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 822 | } |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 823 | mutex_unlock(&md->table_devices_lock); |
| 824 | |
| 825 | *result = &td->dm_dev; |
| 826 | return 0; |
| 827 | } |
| 828 | EXPORT_SYMBOL_GPL(dm_get_table_device); |
| 829 | |
| 830 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) |
| 831 | { |
| 832 | struct table_device *td = container_of(d, struct table_device, dm_dev); |
| 833 | |
| 834 | mutex_lock(&md->table_devices_lock); |
Elena Reshetova | b0b4d7c | 2017-10-20 10:37:39 +0300 | [diff] [blame] | 835 | if (refcount_dec_and_test(&td->count)) { |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 836 | close_table_device(td, md); |
| 837 | list_del(&td->list); |
| 838 | kfree(td); |
| 839 | } |
| 840 | mutex_unlock(&md->table_devices_lock); |
| 841 | } |
| 842 | EXPORT_SYMBOL(dm_put_table_device); |
| 843 | |
| 844 | static void free_table_devices(struct list_head *devices) |
| 845 | { |
| 846 | struct list_head *tmp, *next; |
| 847 | |
| 848 | list_for_each_safe(tmp, next, devices) { |
| 849 | struct table_device *td = list_entry(tmp, struct table_device, list); |
| 850 | |
| 851 | DMWARN("dm_destroy: %s still exists with %d references", |
Elena Reshetova | b0b4d7c | 2017-10-20 10:37:39 +0300 | [diff] [blame] | 852 | td->dm_dev.name, refcount_read(&td->count)); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 853 | kfree(td); |
| 854 | } |
| 855 | } |
| 856 | |
| 857 | /* |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 858 | * Get the geometry associated with a dm device |
| 859 | */ |
| 860 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) |
| 861 | { |
| 862 | *geo = md->geometry; |
| 863 | |
| 864 | return 0; |
| 865 | } |
| 866 | |
| 867 | /* |
| 868 | * Set the geometry of a device. |
| 869 | */ |
| 870 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) |
| 871 | { |
| 872 | sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; |
| 873 | |
| 874 | if (geo->start > sz) { |
| 875 | DMWARN("Start sector is beyond the geometry limits."); |
| 876 | return -EINVAL; |
| 877 | } |
| 878 | |
| 879 | md->geometry = *geo; |
| 880 | |
| 881 | return 0; |
| 882 | } |
| 883 | |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 884 | static int __noflush_suspending(struct mapped_device *md) |
| 885 | { |
| 886 | return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
| 887 | } |
| 888 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | /* |
| 890 | * Decrements the number of outstanding ios that a bio has been |
| 891 | * cloned into, completing the original io if necc. |
| 892 | */ |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 893 | static void dec_pending(struct dm_io *io, blk_status_t error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | { |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 895 | unsigned long flags; |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 896 | blk_status_t io_error; |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 897 | struct bio *bio; |
| 898 | struct mapped_device *md = io->md; |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 899 | |
| 900 | /* Push-back supersedes any I/O errors */ |
Kiyoshi Ueda | f88fb98 | 2009-10-16 23:18:15 +0100 | [diff] [blame] | 901 | if (unlikely(error)) { |
| 902 | spin_lock_irqsave(&io->endio_lock, flags); |
Mike Snitzer | 745dc57 | 2017-12-11 20:51:50 -0500 | [diff] [blame] | 903 | if (!(io->status == BLK_STS_DM_REQUEUE && __noflush_suspending(md))) |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 904 | io->status = error; |
Kiyoshi Ueda | f88fb98 | 2009-10-16 23:18:15 +0100 | [diff] [blame] | 905 | spin_unlock_irqrestore(&io->endio_lock, flags); |
| 906 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
| 908 | if (atomic_dec_and_test(&io->io_count)) { |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 909 | if (io->status == BLK_STS_DM_REQUEUE) { |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 910 | /* |
| 911 | * Target requested pushing back the I/O. |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 912 | */ |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 913 | spin_lock_irqsave(&md->deferred_lock, flags); |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 914 | if (__noflush_suspending(md)) |
Mike Snitzer | 745dc57 | 2017-12-11 20:51:50 -0500 | [diff] [blame] | 915 | /* NOTE early return due to BLK_STS_DM_REQUEUE below */ |
| 916 | bio_list_add_head(&md->deferred, io->orig_bio); |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 917 | else |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 918 | /* noflush suspend was interrupted. */ |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 919 | io->status = BLK_STS_IOERR; |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 920 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 921 | } |
| 922 | |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 923 | io_error = io->status; |
Mike Snitzer | 745dc57 | 2017-12-11 20:51:50 -0500 | [diff] [blame] | 924 | bio = io->orig_bio; |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 925 | end_io_acct(io); |
| 926 | free_io(md, io); |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 927 | |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 928 | if (io_error == BLK_STS_DM_REQUEUE) |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 929 | return; |
| 930 | |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 931 | if ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size) { |
Mikulas Patocka | af7e466 | 2009-04-09 00:27:16 +0100 | [diff] [blame] | 932 | /* |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 933 | * Preflush done for flush with data, reissue |
Mike Christie | 28a8f0d | 2016-06-05 14:32:25 -0500 | [diff] [blame] | 934 | * without REQ_PREFLUSH. |
Mikulas Patocka | af7e466 | 2009-04-09 00:27:16 +0100 | [diff] [blame] | 935 | */ |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 936 | bio->bi_opf &= ~REQ_PREFLUSH; |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 937 | queue_io(md, bio); |
Mikulas Patocka | af7e466 | 2009-04-09 00:27:16 +0100 | [diff] [blame] | 938 | } else { |
Mike Snitzer | b372d36 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 939 | /* done with normal IO or empty flush */ |
NeilBrown | 8dd601f | 2018-02-15 20:00:15 +1100 | [diff] [blame] | 940 | if (io_error) |
| 941 | bio->bi_status = io_error; |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 942 | bio_endio(bio); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 943 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
| 945 | } |
| 946 | |
Mike Snitzer | bcb4443 | 2019-04-03 12:23:11 -0400 | [diff] [blame] | 947 | void disable_discard(struct mapped_device *md) |
| 948 | { |
| 949 | struct queue_limits *limits = dm_get_queue_limits(md); |
| 950 | |
| 951 | /* device doesn't really support DISCARD, disable it */ |
| 952 | limits->max_discard_sectors = 0; |
| 953 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, md->queue); |
| 954 | } |
| 955 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 956 | void disable_write_same(struct mapped_device *md) |
Mike Snitzer | 7eee4ae | 2014-06-02 15:50:06 -0400 | [diff] [blame] | 957 | { |
| 958 | struct queue_limits *limits = dm_get_queue_limits(md); |
| 959 | |
| 960 | /* device doesn't really support WRITE SAME, disable it */ |
| 961 | limits->max_write_same_sectors = 0; |
| 962 | } |
| 963 | |
Christoph Hellwig | ac62d62 | 2017-04-05 19:21:05 +0200 | [diff] [blame] | 964 | void disable_write_zeroes(struct mapped_device *md) |
| 965 | { |
| 966 | struct queue_limits *limits = dm_get_queue_limits(md); |
| 967 | |
| 968 | /* device doesn't really support WRITE ZEROES, disable it */ |
| 969 | limits->max_write_zeroes_sectors = 0; |
| 970 | } |
| 971 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 972 | static void clone_endio(struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | { |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 974 | blk_status_t error = bio->bi_status; |
Mikulas Patocka | bfc6d41 | 2014-03-04 18:24:49 -0500 | [diff] [blame] | 975 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 976 | struct dm_io *io = tio->io; |
Stefan Bader | 9faf400 | 2006-10-03 01:15:41 -0700 | [diff] [blame] | 977 | struct mapped_device *md = tio->io->md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | dm_endio_fn endio = tio->ti->type->end_io; |
Johannes Thumshirn | 415c79e | 2020-06-19 15:59:04 +0900 | [diff] [blame] | 979 | struct bio *orig_bio = io->orig_bio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | |
Mike Snitzer | 9c37de2 | 2020-10-07 15:15:08 -0400 | [diff] [blame] | 981 | if (unlikely(error == BLK_STS_TARGET)) { |
Mike Snitzer | bcb4443 | 2019-04-03 12:23:11 -0400 | [diff] [blame] | 982 | if (bio_op(bio) == REQ_OP_DISCARD && |
| 983 | !bio->bi_disk->queue->limits.max_discard_sectors) |
| 984 | disable_discard(md); |
| 985 | else if (bio_op(bio) == REQ_OP_WRITE_SAME && |
| 986 | !bio->bi_disk->queue->limits.max_write_same_sectors) |
Christoph Hellwig | ac62d62 | 2017-04-05 19:21:05 +0200 | [diff] [blame] | 987 | disable_write_same(md); |
Mike Snitzer | bcb4443 | 2019-04-03 12:23:11 -0400 | [diff] [blame] | 988 | else if (bio_op(bio) == REQ_OP_WRITE_ZEROES && |
| 989 | !bio->bi_disk->queue->limits.max_write_zeroes_sectors) |
Christoph Hellwig | ac62d62 | 2017-04-05 19:21:05 +0200 | [diff] [blame] | 990 | disable_write_zeroes(md); |
| 991 | } |
Mike Snitzer | 7eee4ae | 2014-06-02 15:50:06 -0400 | [diff] [blame] | 992 | |
Johannes Thumshirn | 415c79e | 2020-06-19 15:59:04 +0900 | [diff] [blame] | 993 | /* |
| 994 | * For zone-append bios get offset in zone of the written |
| 995 | * sector and add that to the original bio sector pos. |
| 996 | */ |
| 997 | if (bio_op(orig_bio) == REQ_OP_ZONE_APPEND) { |
| 998 | sector_t written_sector = bio->bi_iter.bi_sector; |
| 999 | struct request_queue *q = orig_bio->bi_disk->queue; |
| 1000 | u64 mask = (u64)blk_queue_zone_sectors(q) - 1; |
| 1001 | |
| 1002 | orig_bio->bi_iter.bi_sector += written_sector & mask; |
| 1003 | } |
| 1004 | |
Christoph Hellwig | 1be5690 | 2017-06-03 09:38:03 +0200 | [diff] [blame] | 1005 | if (endio) { |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 1006 | int r = endio(tio->ti, bio, &error); |
Christoph Hellwig | 1be5690 | 2017-06-03 09:38:03 +0200 | [diff] [blame] | 1007 | switch (r) { |
| 1008 | case DM_ENDIO_REQUEUE: |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 1009 | error = BLK_STS_DM_REQUEUE; |
Gustavo A. R. Silva | df561f66 | 2020-08-23 17:36:59 -0500 | [diff] [blame] | 1010 | fallthrough; |
Christoph Hellwig | 1be5690 | 2017-06-03 09:38:03 +0200 | [diff] [blame] | 1011 | case DM_ENDIO_DONE: |
| 1012 | break; |
| 1013 | case DM_ENDIO_INCOMPLETE: |
| 1014 | /* The target will handle the io */ |
| 1015 | return; |
| 1016 | default: |
| 1017 | DMWARN("unimplemented target endio return value: %d", r); |
| 1018 | BUG(); |
| 1019 | } |
| 1020 | } |
| 1021 | |
Mike Snitzer | cfae752 | 2016-04-11 12:05:38 -0400 | [diff] [blame] | 1022 | free_tio(tio); |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 1023 | dec_pending(io, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | } |
| 1025 | |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 1026 | /* |
Mike Snitzer | 56a67df | 2010-08-12 04:14:10 +0100 | [diff] [blame] | 1027 | * Return maximum size of I/O possible at the supplied sector up to the current |
| 1028 | * target boundary. |
| 1029 | */ |
Mike Snitzer | 3720281 | 2020-09-19 13:12:48 -0400 | [diff] [blame] | 1030 | static inline sector_t max_io_len_target_boundary(struct dm_target *ti, |
| 1031 | sector_t target_offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | { |
Mike Snitzer | 56a67df | 2010-08-12 04:14:10 +0100 | [diff] [blame] | 1033 | return ti->len - target_offset; |
| 1034 | } |
| 1035 | |
Mike Snitzer | 3720281 | 2020-09-19 13:12:48 -0400 | [diff] [blame] | 1036 | static sector_t max_io_len(struct dm_target *ti, sector_t sector) |
Mike Snitzer | 56a67df | 2010-08-12 04:14:10 +0100 | [diff] [blame] | 1037 | { |
Mike Snitzer | 3720281 | 2020-09-19 13:12:48 -0400 | [diff] [blame] | 1038 | sector_t target_offset = dm_target_offset(ti, sector); |
| 1039 | sector_t len = max_io_len_target_boundary(ti, target_offset); |
Mike Snitzer | 5091cde | 2020-09-18 20:22:30 -0400 | [diff] [blame] | 1040 | sector_t max_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | |
| 1042 | /* |
Mike Snitzer | 3ee16db | 2020-11-30 10:57:43 -0500 | [diff] [blame] | 1043 | * Does the target need to split IO even further? |
| 1044 | * - varied (per target) IO splitting is a tenet of DM; this |
| 1045 | * explains why stacked chunk_sectors based splitting via |
| 1046 | * blk_max_size_offset() isn't possible here. So pass in |
| 1047 | * ti->max_io_len to override stacked chunk_sectors. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | */ |
Mike Snitzer | 3ee16db | 2020-11-30 10:57:43 -0500 | [diff] [blame] | 1049 | if (ti->max_io_len) { |
| 1050 | max_len = blk_max_size_offset(ti->table->md->queue, |
| 1051 | target_offset, ti->max_io_len); |
| 1052 | if (len > max_len) |
| 1053 | len = max_len; |
| 1054 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | |
| 1056 | return len; |
| 1057 | } |
| 1058 | |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 1059 | int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) |
| 1060 | { |
| 1061 | if (len > UINT_MAX) { |
| 1062 | DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)", |
| 1063 | (unsigned long long)len, UINT_MAX); |
| 1064 | ti->error = "Maximum size of target IO is too large"; |
| 1065 | return -EINVAL; |
| 1066 | } |
| 1067 | |
Mikulas Patocka | 75ae193 | 2019-03-21 16:46:12 -0400 | [diff] [blame] | 1068 | ti->max_io_len = (uint32_t) len; |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 1069 | |
| 1070 | return 0; |
| 1071 | } |
| 1072 | EXPORT_SYMBOL_GPL(dm_set_target_max_io_len); |
| 1073 | |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1074 | static struct dm_target *dm_dax_get_live_target(struct mapped_device *md, |
Mike Snitzer | 3d97c82 | 2018-04-30 16:06:28 -0400 | [diff] [blame] | 1075 | sector_t sector, int *srcu_idx) |
| 1076 | __acquires(md->io_barrier) |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1077 | { |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1078 | struct dm_table *map; |
| 1079 | struct dm_target *ti; |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1080 | |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1081 | map = dm_get_live_table(md, srcu_idx); |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1082 | if (!map) |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1083 | return NULL; |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1084 | |
| 1085 | ti = dm_table_find_target(map, sector); |
Mikulas Patocka | 123d87d | 2019-08-23 09:55:26 -0400 | [diff] [blame] | 1086 | if (!ti) |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1087 | return NULL; |
| 1088 | |
| 1089 | return ti; |
| 1090 | } |
| 1091 | |
| 1092 | static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, |
Mike Snitzer | 3d97c82 | 2018-04-30 16:06:28 -0400 | [diff] [blame] | 1093 | long nr_pages, void **kaddr, pfn_t *pfn) |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1094 | { |
| 1095 | struct mapped_device *md = dax_get_private(dax_dev); |
| 1096 | sector_t sector = pgoff * PAGE_SECTORS; |
| 1097 | struct dm_target *ti; |
| 1098 | long len, ret = -EIO; |
| 1099 | int srcu_idx; |
| 1100 | |
| 1101 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); |
| 1102 | |
| 1103 | if (!ti) |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1104 | goto out; |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1105 | if (!ti->type->direct_access) |
| 1106 | goto out; |
Mike Snitzer | 3720281 | 2020-09-19 13:12:48 -0400 | [diff] [blame] | 1107 | len = max_io_len(ti, sector) / PAGE_SECTORS; |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1108 | if (len < 1) |
| 1109 | goto out; |
| 1110 | nr_pages = min(len, nr_pages); |
Ross Zwisler | dbc6265 | 2018-06-26 16:30:41 -0600 | [diff] [blame] | 1111 | ret = ti->type->direct_access(ti, pgoff, nr_pages, kaddr, pfn); |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 1112 | |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1113 | out: |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1114 | dm_put_live_table(md, srcu_idx); |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1115 | |
| 1116 | return ret; |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1117 | } |
| 1118 | |
Dan Williams | 7bf7eac | 2019-05-16 13:26:29 -0700 | [diff] [blame] | 1119 | static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bdev, |
| 1120 | int blocksize, sector_t start, sector_t len) |
| 1121 | { |
| 1122 | struct mapped_device *md = dax_get_private(dax_dev); |
| 1123 | struct dm_table *map; |
Dan Williams | 02186d8 | 2020-09-18 12:51:15 -0700 | [diff] [blame] | 1124 | bool ret = false; |
Dan Williams | 7bf7eac | 2019-05-16 13:26:29 -0700 | [diff] [blame] | 1125 | int srcu_idx; |
Dan Williams | 7bf7eac | 2019-05-16 13:26:29 -0700 | [diff] [blame] | 1126 | |
| 1127 | map = dm_get_live_table(md, &srcu_idx); |
| 1128 | if (!map) |
Dan Williams | 02186d8 | 2020-09-18 12:51:15 -0700 | [diff] [blame] | 1129 | goto out; |
Dan Williams | 7bf7eac | 2019-05-16 13:26:29 -0700 | [diff] [blame] | 1130 | |
Pankaj Gupta | 2e9ee09 | 2019-07-05 19:33:25 +0530 | [diff] [blame] | 1131 | ret = dm_table_supports_dax(map, device_supports_dax, &blocksize); |
Dan Williams | 7bf7eac | 2019-05-16 13:26:29 -0700 | [diff] [blame] | 1132 | |
Dan Williams | 02186d8 | 2020-09-18 12:51:15 -0700 | [diff] [blame] | 1133 | out: |
Dan Williams | 7bf7eac | 2019-05-16 13:26:29 -0700 | [diff] [blame] | 1134 | dm_put_live_table(md, srcu_idx); |
| 1135 | |
| 1136 | return ret; |
| 1137 | } |
| 1138 | |
Dan Williams | 7e026c8 | 2017-05-29 12:57:56 -0700 | [diff] [blame] | 1139 | static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
Mike Snitzer | 3d97c82 | 2018-04-30 16:06:28 -0400 | [diff] [blame] | 1140 | void *addr, size_t bytes, struct iov_iter *i) |
Dan Williams | 7e026c8 | 2017-05-29 12:57:56 -0700 | [diff] [blame] | 1141 | { |
| 1142 | struct mapped_device *md = dax_get_private(dax_dev); |
| 1143 | sector_t sector = pgoff * PAGE_SECTORS; |
| 1144 | struct dm_target *ti; |
| 1145 | long ret = 0; |
| 1146 | int srcu_idx; |
| 1147 | |
| 1148 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); |
| 1149 | |
| 1150 | if (!ti) |
| 1151 | goto out; |
| 1152 | if (!ti->type->dax_copy_from_iter) { |
| 1153 | ret = copy_from_iter(addr, bytes, i); |
| 1154 | goto out; |
| 1155 | } |
| 1156 | ret = ti->type->dax_copy_from_iter(ti, pgoff, addr, bytes, i); |
| 1157 | out: |
| 1158 | dm_put_live_table(md, srcu_idx); |
| 1159 | |
| 1160 | return ret; |
| 1161 | } |
| 1162 | |
Dan Williams | b3a9a0c | 2018-05-02 06:46:33 -0700 | [diff] [blame] | 1163 | static size_t dm_dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
| 1164 | void *addr, size_t bytes, struct iov_iter *i) |
| 1165 | { |
| 1166 | struct mapped_device *md = dax_get_private(dax_dev); |
| 1167 | sector_t sector = pgoff * PAGE_SECTORS; |
| 1168 | struct dm_target *ti; |
| 1169 | long ret = 0; |
| 1170 | int srcu_idx; |
| 1171 | |
| 1172 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); |
| 1173 | |
| 1174 | if (!ti) |
| 1175 | goto out; |
| 1176 | if (!ti->type->dax_copy_to_iter) { |
| 1177 | ret = copy_to_iter(addr, bytes, i); |
| 1178 | goto out; |
| 1179 | } |
| 1180 | ret = ti->type->dax_copy_to_iter(ti, pgoff, addr, bytes, i); |
| 1181 | out: |
| 1182 | dm_put_live_table(md, srcu_idx); |
| 1183 | |
| 1184 | return ret; |
| 1185 | } |
| 1186 | |
Vivek Goyal | cdf6cdc | 2020-02-28 11:34:54 -0500 | [diff] [blame] | 1187 | static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, |
| 1188 | size_t nr_pages) |
| 1189 | { |
| 1190 | struct mapped_device *md = dax_get_private(dax_dev); |
| 1191 | sector_t sector = pgoff * PAGE_SECTORS; |
| 1192 | struct dm_target *ti; |
| 1193 | int ret = -EIO; |
| 1194 | int srcu_idx; |
| 1195 | |
| 1196 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); |
| 1197 | |
| 1198 | if (!ti) |
| 1199 | goto out; |
| 1200 | if (WARN_ON(!ti->type->dax_zero_page_range)) { |
| 1201 | /* |
| 1202 | * ->zero_page_range() is mandatory dax operation. If we are |
| 1203 | * here, something is wrong. |
| 1204 | */ |
Vivek Goyal | cdf6cdc | 2020-02-28 11:34:54 -0500 | [diff] [blame] | 1205 | goto out; |
| 1206 | } |
| 1207 | ret = ti->type->dax_zero_page_range(ti, pgoff, nr_pages); |
Vivek Goyal | cdf6cdc | 2020-02-28 11:34:54 -0500 | [diff] [blame] | 1208 | out: |
| 1209 | dm_put_live_table(md, srcu_idx); |
| 1210 | |
| 1211 | return ret; |
| 1212 | } |
| 1213 | |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1214 | /* |
| 1215 | * A target may call dm_accept_partial_bio only from the map routine. It is |
Ajay Joshi | 2e2d6f7 | 2019-10-27 23:05:48 +0900 | [diff] [blame] | 1216 | * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_RESET, |
| 1217 | * REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH. |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1218 | * |
| 1219 | * dm_accept_partial_bio informs the dm that the target only wants to process |
| 1220 | * additional n_sectors sectors of the bio and the rest of the data should be |
| 1221 | * sent in a next bio. |
| 1222 | * |
| 1223 | * A diagram that explains the arithmetics: |
| 1224 | * +--------------------+---------------+-------+ |
| 1225 | * | 1 | 2 | 3 | |
| 1226 | * +--------------------+---------------+-------+ |
| 1227 | * |
| 1228 | * <-------------- *tio->len_ptr ---------------> |
| 1229 | * <------- bi_size -------> |
| 1230 | * <-- n_sectors --> |
| 1231 | * |
| 1232 | * Region 1 was already iterated over with bio_advance or similar function. |
| 1233 | * (it may be empty if the target doesn't use bio_advance) |
| 1234 | * Region 2 is the remaining bio size that the target wants to process. |
| 1235 | * (it may be empty if region 1 is non-empty, although there is no reason |
| 1236 | * to make it empty) |
| 1237 | * The target requires that region 3 is to be sent in the next bio. |
| 1238 | * |
| 1239 | * If the target wants to receive multiple copies of the bio (via num_*bios, etc), |
| 1240 | * the partially processed part (the sum of regions 1+2) must be the same for all |
| 1241 | * copies of the bio. |
| 1242 | */ |
| 1243 | void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) |
| 1244 | { |
| 1245 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
| 1246 | unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT; |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 1247 | BUG_ON(bio->bi_opf & REQ_PREFLUSH); |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1248 | BUG_ON(bi_size > *tio->len_ptr); |
| 1249 | BUG_ON(n_sectors > bi_size); |
| 1250 | *tio->len_ptr -= bi_size - n_sectors; |
| 1251 | bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; |
| 1252 | } |
| 1253 | EXPORT_SYMBOL_GPL(dm_accept_partial_bio); |
| 1254 | |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1255 | static blk_qc_t __map_bio(struct dm_target_io *tio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | { |
| 1257 | int r; |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 1258 | sector_t sector; |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1259 | struct bio *clone = &tio->clone; |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 1260 | struct dm_io *io = tio->io; |
Alasdair G Kergon | bd2a49b | 2013-03-01 22:45:46 +0000 | [diff] [blame] | 1261 | struct dm_target *ti = tio->ti; |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1262 | blk_qc_t ret = BLK_QC_T_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | clone->bi_end_io = clone_endio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
| 1266 | /* |
| 1267 | * Map the clone. If r == 0 we don't need to do |
| 1268 | * anything, the target has assumed ownership of |
| 1269 | * this io. |
| 1270 | */ |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 1271 | atomic_inc(&io->io_count); |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1272 | sector = clone->bi_iter.bi_sector; |
Mikulas Patocka | d67a5f4 | 2017-02-15 11:26:10 -0500 | [diff] [blame] | 1273 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 1274 | r = ti->type->map(ti, clone); |
Christoph Hellwig | 846785e | 2017-06-03 09:38:02 +0200 | [diff] [blame] | 1275 | switch (r) { |
| 1276 | case DM_MAPIO_SUBMITTED: |
| 1277 | break; |
| 1278 | case DM_MAPIO_REMAPPED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | /* the bio has been remapped so dispatch it */ |
Christoph Hellwig | 1c02fca | 2020-12-03 17:21:38 +0100 | [diff] [blame] | 1280 | trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector); |
Christoph Hellwig | 5a6c35f | 2020-07-01 10:59:47 +0200 | [diff] [blame] | 1281 | ret = submit_bio_noacct(clone); |
Christoph Hellwig | 846785e | 2017-06-03 09:38:02 +0200 | [diff] [blame] | 1282 | break; |
| 1283 | case DM_MAPIO_KILL: |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 1284 | free_tio(tio); |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 1285 | dec_pending(io, BLK_STS_IOERR); |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 1286 | break; |
Christoph Hellwig | 846785e | 2017-06-03 09:38:02 +0200 | [diff] [blame] | 1287 | case DM_MAPIO_REQUEUE: |
Mike Snitzer | cfae752 | 2016-04-11 12:05:38 -0400 | [diff] [blame] | 1288 | free_tio(tio); |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 1289 | dec_pending(io, BLK_STS_DM_REQUEUE); |
Christoph Hellwig | 846785e | 2017-06-03 09:38:02 +0200 | [diff] [blame] | 1290 | break; |
| 1291 | default: |
Kiyoshi Ueda | 45cbcd7 | 2006-12-08 02:41:05 -0800 | [diff] [blame] | 1292 | DMWARN("unimplemented target map return value: %d", r); |
| 1293 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1296 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | |
Mikulas Patocka | e0d6609 | 2014-03-14 18:40:39 -0400 | [diff] [blame] | 1299 | static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) |
Alasdair G Kergon | bd2a49b | 2013-03-01 22:45:46 +0000 | [diff] [blame] | 1300 | { |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1301 | bio->bi_iter.bi_sector = sector; |
| 1302 | bio->bi_iter.bi_size = to_bytes(len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | } |
| 1304 | |
| 1305 | /* |
| 1306 | * Creates a bio that consists of range of complete bvecs. |
| 1307 | */ |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1308 | static int clone_bio(struct dm_target_io *tio, struct bio *bio, |
| 1309 | sector_t sector, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | { |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1311 | struct bio *clone = &tio->clone; |
Eric Biggers | 0756015 | 2020-09-15 20:53:13 -0700 | [diff] [blame] | 1312 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1314 | __bio_clone_fast(clone, bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | |
Eric Biggers | 0756015 | 2020-09-15 20:53:13 -0700 | [diff] [blame] | 1316 | r = bio_crypt_clone(clone, bio, GFP_NOIO); |
| 1317 | if (r < 0) |
| 1318 | return r; |
Satya Tangirala | a892c8d | 2020-05-14 00:37:18 +0000 | [diff] [blame] | 1319 | |
Mike Snitzer | 57c3651 | 2019-01-16 18:53:26 -0500 | [diff] [blame] | 1320 | if (bio_integrity(bio)) { |
Mikulas Patocka | e2460f2 | 2017-04-18 16:51:48 -0400 | [diff] [blame] | 1321 | if (unlikely(!dm_target_has_integrity(tio->ti->type) && |
| 1322 | !dm_target_passes_integrity(tio->ti->type))) { |
| 1323 | DMWARN("%s: the target %s doesn't support integrity data.", |
| 1324 | dm_device_name(tio->io->md), |
| 1325 | tio->ti->type->name); |
| 1326 | return -EIO; |
| 1327 | } |
| 1328 | |
| 1329 | r = bio_integrity_clone(clone, bio, GFP_NOIO); |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1330 | if (r < 0) |
| 1331 | return r; |
| 1332 | } |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1333 | |
Mike Snitzer | fa8db49 | 2019-02-05 17:07:58 -0500 | [diff] [blame] | 1334 | bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector)); |
| 1335 | clone->bi_iter.bi_size = to_bytes(len); |
| 1336 | |
| 1337 | if (bio_integrity(bio)) |
| 1338 | bio_integrity_trim(clone); |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1339 | |
| 1340 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | } |
| 1342 | |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1343 | static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci, |
| 1344 | struct dm_target *ti, unsigned num_bios) |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1345 | { |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1346 | struct dm_target_io *tio; |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1347 | int try; |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1348 | |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1349 | if (!num_bios) |
| 1350 | return; |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1351 | |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1352 | if (num_bios == 1) { |
| 1353 | tio = alloc_tio(ci, ti, 0, GFP_NOIO); |
| 1354 | bio_list_add(blist, &tio->clone); |
| 1355 | return; |
| 1356 | } |
Alasdair G Kergon | 9015df2 | 2009-06-22 10:12:21 +0100 | [diff] [blame] | 1357 | |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1358 | for (try = 0; try < 2; try++) { |
| 1359 | int bio_nr; |
| 1360 | struct bio *bio; |
| 1361 | |
| 1362 | if (try) |
Mike Snitzer | bc02cdb | 2017-12-14 16:30:42 -0500 | [diff] [blame] | 1363 | mutex_lock(&ci->io->md->table_devices_lock); |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1364 | for (bio_nr = 0; bio_nr < num_bios; bio_nr++) { |
| 1365 | tio = alloc_tio(ci, ti, bio_nr, try ? GFP_NOIO : GFP_NOWAIT); |
| 1366 | if (!tio) |
| 1367 | break; |
| 1368 | |
| 1369 | bio_list_add(blist, &tio->clone); |
| 1370 | } |
| 1371 | if (try) |
Mike Snitzer | bc02cdb | 2017-12-14 16:30:42 -0500 | [diff] [blame] | 1372 | mutex_unlock(&ci->io->md->table_devices_lock); |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1373 | if (bio_nr == num_bios) |
| 1374 | return; |
| 1375 | |
| 1376 | while ((bio = bio_list_pop(blist))) { |
| 1377 | tio = container_of(bio, struct dm_target_io, clone); |
| 1378 | free_tio(tio); |
| 1379 | } |
| 1380 | } |
Alasdair G Kergon | 9015df2 | 2009-06-22 10:12:21 +0100 | [diff] [blame] | 1381 | } |
| 1382 | |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1383 | static blk_qc_t __clone_and_map_simple_bio(struct clone_info *ci, |
| 1384 | struct dm_target_io *tio, unsigned *len) |
Alasdair G Kergon | 9015df2 | 2009-06-22 10:12:21 +0100 | [diff] [blame] | 1385 | { |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1386 | struct bio *clone = &tio->clone; |
Alasdair G Kergon | 9015df2 | 2009-06-22 10:12:21 +0100 | [diff] [blame] | 1387 | |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1388 | tio->len_ptr = len; |
| 1389 | |
Junichi Nomura | 9977827 | 2014-10-03 11:55:16 +0000 | [diff] [blame] | 1390 | __bio_clone_fast(clone, ci->bio); |
Alasdair G Kergon | bd2a49b | 2013-03-01 22:45:46 +0000 | [diff] [blame] | 1391 | if (len) |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1392 | bio_setup_sector(clone, ci->sector, *len); |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1393 | |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1394 | return __map_bio(tio); |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1395 | } |
| 1396 | |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1397 | static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1398 | unsigned num_bios, unsigned *len) |
Mike Snitzer | 06a426c | 2010-08-12 04:14:09 +0100 | [diff] [blame] | 1399 | { |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1400 | struct bio_list blist = BIO_EMPTY_LIST; |
| 1401 | struct bio *bio; |
| 1402 | struct dm_target_io *tio; |
Mike Snitzer | 06a426c | 2010-08-12 04:14:09 +0100 | [diff] [blame] | 1403 | |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1404 | alloc_multiple_bios(&blist, ci, ti, num_bios); |
| 1405 | |
| 1406 | while ((bio = bio_list_pop(&blist))) { |
| 1407 | tio = container_of(bio, struct dm_target_io, clone); |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1408 | (void) __clone_and_map_simple_bio(ci, tio, len); |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1409 | } |
Mike Snitzer | 06a426c | 2010-08-12 04:14:09 +0100 | [diff] [blame] | 1410 | } |
| 1411 | |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1412 | static int __send_empty_flush(struct clone_info *ci) |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1413 | { |
Mike Snitzer | 06a426c | 2010-08-12 04:14:09 +0100 | [diff] [blame] | 1414 | unsigned target_nr = 0; |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1415 | struct dm_target *ti; |
Mike Snitzer | 828678b | 2020-09-14 13:59:53 -0400 | [diff] [blame] | 1416 | struct bio flush_bio; |
| 1417 | |
| 1418 | /* |
| 1419 | * Use an on-stack bio for this, it's safe since we don't |
| 1420 | * need to reference it after submit. It's just used as |
| 1421 | * the basis for the clone(s). |
| 1422 | */ |
| 1423 | bio_init(&flush_bio, NULL, 0); |
| 1424 | flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC; |
Christoph Hellwig | 47d9510 | 2020-11-07 09:30:05 +0100 | [diff] [blame] | 1425 | flush_bio.bi_disk = ci->io->md->disk; |
| 1426 | bio_associate_blkg(&flush_bio); |
| 1427 | |
Mike Snitzer | 828678b | 2020-09-14 13:59:53 -0400 | [diff] [blame] | 1428 | ci->bio = &flush_bio; |
| 1429 | ci->sector_count = 0; |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1430 | |
Mike Snitzer | b372d36 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 1431 | BUG_ON(bio_has_data(ci->bio)); |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1432 | while ((ti = dm_table_get_target(ci->map, target_nr++))) |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1433 | __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL); |
Mike Snitzer | 828678b | 2020-09-14 13:59:53 -0400 | [diff] [blame] | 1434 | |
| 1435 | bio_uninit(ci->bio); |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1436 | return 0; |
| 1437 | } |
| 1438 | |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1439 | static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti, |
NeilBrown | f31c21e | 2017-11-22 14:25:18 +1100 | [diff] [blame] | 1440 | sector_t sector, unsigned *len) |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1441 | { |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1442 | struct bio *bio = ci->bio; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1443 | struct dm_target_io *tio; |
NeilBrown | f31c21e | 2017-11-22 14:25:18 +1100 | [diff] [blame] | 1444 | int r; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1445 | |
Mike Snitzer | 318716d | 2017-11-22 14:56:12 -0500 | [diff] [blame] | 1446 | tio = alloc_tio(ci, ti, 0, GFP_NOIO); |
NeilBrown | f31c21e | 2017-11-22 14:25:18 +1100 | [diff] [blame] | 1447 | tio->len_ptr = len; |
| 1448 | r = clone_bio(tio, bio, sector, *len); |
| 1449 | if (r < 0) { |
| 1450 | free_tio(tio); |
| 1451 | return r; |
Alasdair G Kergon | b0d8ed4 | 2013-03-01 22:45:49 +0000 | [diff] [blame] | 1452 | } |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1453 | (void) __map_bio(tio); |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1454 | |
NeilBrown | f31c21e | 2017-11-22 14:25:18 +1100 | [diff] [blame] | 1455 | return 0; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1456 | } |
| 1457 | |
Mike Snitzer | 3d7f456 | 2017-12-08 15:02:11 -0500 | [diff] [blame] | 1458 | static int __send_changing_extent_only(struct clone_info *ci, struct dm_target *ti, |
Mike Snitzer | 61697a6 | 2019-01-18 14:19:26 -0500 | [diff] [blame] | 1459 | unsigned num_bios) |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1460 | { |
Michael Lass | 51b86f9 | 2019-05-21 21:58:07 +0200 | [diff] [blame] | 1461 | unsigned len; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1462 | |
Mike Snitzer | 3d7f456 | 2017-12-08 15:02:11 -0500 | [diff] [blame] | 1463 | /* |
| 1464 | * Even though the device advertised support for this type of |
| 1465 | * request, that does not mean every target supports it, and |
| 1466 | * reconfiguration might also have changed that since the |
| 1467 | * check was performed. |
| 1468 | */ |
Mike Snitzer | 3d7f456 | 2017-12-08 15:02:11 -0500 | [diff] [blame] | 1469 | if (!num_bios) |
| 1470 | return -EOPNOTSUPP; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1471 | |
Mike Snitzer | 3720281 | 2020-09-19 13:12:48 -0400 | [diff] [blame] | 1472 | len = min_t(sector_t, ci->sector_count, |
| 1473 | max_io_len_target_boundary(ti, dm_target_offset(ti, ci->sector))); |
Michael Lass | 51b86f9 | 2019-05-21 21:58:07 +0200 | [diff] [blame] | 1474 | |
Mike Snitzer | 3d7f456 | 2017-12-08 15:02:11 -0500 | [diff] [blame] | 1475 | __send_duplicate_bios(ci, ti, num_bios, &len); |
Mike Snitzer | 06a426c | 2010-08-12 04:14:09 +0100 | [diff] [blame] | 1476 | |
Mike Snitzer | 3d7f456 | 2017-12-08 15:02:11 -0500 | [diff] [blame] | 1477 | ci->sector += len; |
| 1478 | ci->sector_count -= len; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1479 | |
| 1480 | return 0; |
| 1481 | } |
| 1482 | |
Mike Snitzer | 568c73a | 2019-01-18 14:10:37 -0500 | [diff] [blame] | 1483 | static bool is_abnormal_io(struct bio *bio) |
| 1484 | { |
| 1485 | bool r = false; |
| 1486 | |
| 1487 | switch (bio_op(bio)) { |
| 1488 | case REQ_OP_DISCARD: |
| 1489 | case REQ_OP_SECURE_ERASE: |
| 1490 | case REQ_OP_WRITE_SAME: |
| 1491 | case REQ_OP_WRITE_ZEROES: |
| 1492 | r = true; |
| 1493 | break; |
| 1494 | } |
| 1495 | |
| 1496 | return r; |
| 1497 | } |
| 1498 | |
Mike Snitzer | 0519c71 | 2018-03-26 11:49:16 -0400 | [diff] [blame] | 1499 | static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti, |
| 1500 | int *result) |
| 1501 | { |
| 1502 | struct bio *bio = ci->bio; |
Mike Snitzer | 9679b5a | 2020-09-15 21:56:29 -0400 | [diff] [blame] | 1503 | unsigned num_bios = 0; |
Mike Snitzer | 0519c71 | 2018-03-26 11:49:16 -0400 | [diff] [blame] | 1504 | |
Mike Snitzer | 9679b5a | 2020-09-15 21:56:29 -0400 | [diff] [blame] | 1505 | switch (bio_op(bio)) { |
| 1506 | case REQ_OP_DISCARD: |
| 1507 | num_bios = ti->num_discard_bios; |
| 1508 | break; |
| 1509 | case REQ_OP_SECURE_ERASE: |
| 1510 | num_bios = ti->num_secure_erase_bios; |
| 1511 | break; |
| 1512 | case REQ_OP_WRITE_SAME: |
| 1513 | num_bios = ti->num_write_same_bios; |
| 1514 | break; |
| 1515 | case REQ_OP_WRITE_ZEROES: |
| 1516 | num_bios = ti->num_write_zeroes_bios; |
| 1517 | break; |
| 1518 | default: |
Mike Snitzer | 0519c71 | 2018-03-26 11:49:16 -0400 | [diff] [blame] | 1519 | return false; |
Mike Snitzer | 9679b5a | 2020-09-15 21:56:29 -0400 | [diff] [blame] | 1520 | } |
Mike Snitzer | 0519c71 | 2018-03-26 11:49:16 -0400 | [diff] [blame] | 1521 | |
Mike Snitzer | 9679b5a | 2020-09-15 21:56:29 -0400 | [diff] [blame] | 1522 | *result = __send_changing_extent_only(ci, ti, num_bios); |
Mike Snitzer | 0519c71 | 2018-03-26 11:49:16 -0400 | [diff] [blame] | 1523 | return true; |
| 1524 | } |
| 1525 | |
Alasdair G Kergon | e4c9381 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1526 | /* |
Alasdair G Kergon | e4c9381 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1527 | * Select the correct strategy for processing a non-flush bio. |
| 1528 | */ |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1529 | static int __split_and_process_non_flush(struct clone_info *ci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | { |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1531 | struct dm_target *ti; |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1532 | unsigned len; |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1533 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1535 | ti = dm_table_find_target(ci->map, ci->sector); |
Mikulas Patocka | 123d87d | 2019-08-23 09:55:26 -0400 | [diff] [blame] | 1536 | if (!ti) |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1537 | return -EIO; |
| 1538 | |
Mike Snitzer | 568c73a | 2019-01-18 14:10:37 -0500 | [diff] [blame] | 1539 | if (__process_abnormal_io(ci, ti, &r)) |
Mike Snitzer | 0519c71 | 2018-03-26 11:49:16 -0400 | [diff] [blame] | 1540 | return r; |
Mike Snitzer | 3d7f456 | 2017-12-08 15:02:11 -0500 | [diff] [blame] | 1541 | |
Mike Snitzer | 3720281 | 2020-09-19 13:12:48 -0400 | [diff] [blame] | 1542 | len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count); |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1543 | |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1544 | r = __clone_and_map_data_bio(ci, ti, ci->sector, &len); |
| 1545 | if (r < 0) |
| 1546 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1548 | ci->sector += len; |
| 1549 | ci->sector_count -= len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1551 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | } |
| 1553 | |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1554 | static void init_clone_info(struct clone_info *ci, struct mapped_device *md, |
| 1555 | struct dm_table *map, struct bio *bio) |
| 1556 | { |
| 1557 | ci->map = map; |
| 1558 | ci->io = alloc_io(md, bio); |
| 1559 | ci->sector = bio->bi_iter.bi_sector; |
| 1560 | } |
| 1561 | |
Mike Snitzer | a1e1cb7 | 2019-01-17 10:48:01 -0500 | [diff] [blame] | 1562 | #define __dm_part_stat_sub(part, field, subnd) \ |
| 1563 | (part_stat_get(part, field) -= (subnd)) |
| 1564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | /* |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1566 | * Entry point to split a bio into clones and submit them to the targets. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | */ |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1568 | static blk_qc_t __split_and_process_bio(struct mapped_device *md, |
| 1569 | struct dm_table *map, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | { |
| 1571 | struct clone_info ci; |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1572 | blk_qc_t ret = BLK_QC_T_NONE; |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1573 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1575 | init_clone_info(&ci, md, map, bio); |
Alasdair G Kergon | bd2a49b | 2013-03-01 22:45:46 +0000 | [diff] [blame] | 1576 | |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 1577 | if (bio->bi_opf & REQ_PREFLUSH) { |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1578 | error = __send_empty_flush(&ci); |
Mike Snitzer | b372d36 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 1579 | /* dec_pending submits any data associated with flush */ |
Ajay Joshi | 2e2d6f7 | 2019-10-27 23:05:48 +0900 | [diff] [blame] | 1580 | } else if (op_is_zone_mgmt(bio_op(bio))) { |
Damien Le Moal | a4aa5e5 | 2017-05-08 16:40:46 -0700 | [diff] [blame] | 1581 | ci.bio = bio; |
| 1582 | ci.sector_count = 0; |
| 1583 | error = __split_and_process_non_flush(&ci); |
Mike Snitzer | b372d36 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 1584 | } else { |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 1585 | ci.bio = bio; |
Tejun Heo | d87f4c1 | 2010-09-03 11:56:19 +0200 | [diff] [blame] | 1586 | ci.sector_count = bio_sectors(bio); |
NeilBrown | 18a25da | 2017-09-06 09:43:28 +1000 | [diff] [blame] | 1587 | while (ci.sector_count && !error) { |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1588 | error = __split_and_process_non_flush(&ci); |
Jeffle Xu | 985eabd | 2020-11-04 11:57:56 +0800 | [diff] [blame] | 1589 | if (ci.sector_count && !error) { |
NeilBrown | 18a25da | 2017-09-06 09:43:28 +1000 | [diff] [blame] | 1590 | /* |
Christoph Hellwig | ed00aab | 2020-07-01 10:59:44 +0200 | [diff] [blame] | 1591 | * Remainder must be passed to submit_bio_noacct() |
NeilBrown | 18a25da | 2017-09-06 09:43:28 +1000 | [diff] [blame] | 1592 | * so that it gets handled *after* bios already submitted |
| 1593 | * have been completely processed. |
| 1594 | * We take a clone of the original to store in |
Mike Snitzer | 745dc57 | 2017-12-11 20:51:50 -0500 | [diff] [blame] | 1595 | * ci.io->orig_bio to be used by end_io_acct() and |
NeilBrown | 18a25da | 2017-09-06 09:43:28 +1000 | [diff] [blame] | 1596 | * for dec_pending to use for completion handling. |
NeilBrown | 18a25da | 2017-09-06 09:43:28 +1000 | [diff] [blame] | 1597 | */ |
Mike Snitzer | f21c601 | 2018-06-15 09:35:33 -0400 | [diff] [blame] | 1598 | struct bio *b = bio_split(bio, bio_sectors(bio) - ci.sector_count, |
| 1599 | GFP_NOIO, &md->queue->bio_split); |
Mike Snitzer | 745dc57 | 2017-12-11 20:51:50 -0500 | [diff] [blame] | 1600 | ci.io->orig_bio = b; |
Mike Snitzer | a1e1cb7 | 2019-01-17 10:48:01 -0500 | [diff] [blame] | 1601 | |
| 1602 | /* |
| 1603 | * Adjust IO stats for each split, otherwise upon queue |
| 1604 | * reentry there will be redundant IO accounting. |
| 1605 | * NOTE: this is a stop-gap fix, a proper fix involves |
| 1606 | * significant refactoring of DM core's bio splitting |
| 1607 | * (by eliminating DM's splitting and just using bio_split) |
| 1608 | */ |
| 1609 | part_stat_lock(); |
Christoph Hellwig | 8446fe9 | 2020-11-24 09:36:54 +0100 | [diff] [blame] | 1610 | __dm_part_stat_sub(dm_disk(md)->part0, |
Mike Snitzer | a1e1cb7 | 2019-01-17 10:48:01 -0500 | [diff] [blame] | 1611 | sectors[op_stat_group(bio_op(bio))], ci.sector_count); |
| 1612 | part_stat_unlock(); |
| 1613 | |
NeilBrown | 18a25da | 2017-09-06 09:43:28 +1000 | [diff] [blame] | 1614 | bio_chain(b, bio); |
Christoph Hellwig | eb6f7f7 | 2020-12-03 17:21:37 +0100 | [diff] [blame] | 1615 | trace_block_split(b, bio->bi_iter.bi_sector); |
Christoph Hellwig | ed00aab | 2020-07-01 10:59:44 +0200 | [diff] [blame] | 1616 | ret = submit_bio_noacct(bio); |
NeilBrown | 18a25da | 2017-09-06 09:43:28 +1000 | [diff] [blame] | 1617 | break; |
| 1618 | } |
| 1619 | } |
Tejun Heo | d87f4c1 | 2010-09-03 11:56:19 +0200 | [diff] [blame] | 1620 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | |
| 1622 | /* drop the extra reference count */ |
Bart Van Assche | 54385bf | 2017-08-09 11:32:10 -0700 | [diff] [blame] | 1623 | dec_pending(ci.io, errno_to_blk_status(error)); |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1624 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | |
Christoph Hellwig | c62b37d | 2020-07-01 10:59:43 +0200 | [diff] [blame] | 1627 | static blk_qc_t dm_submit_bio(struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | { |
Christoph Hellwig | c4a59c4 | 2020-07-01 10:59:37 +0200 | [diff] [blame] | 1629 | struct mapped_device *md = bio->bi_disk->private_data; |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1630 | blk_qc_t ret = BLK_QC_T_NONE; |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1631 | int srcu_idx; |
| 1632 | struct dm_table *map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1634 | map = dm_get_live_table(md, &srcu_idx); |
Mike Snitzer | b2abdb1 | 2020-09-30 13:45:20 -0400 | [diff] [blame] | 1635 | if (unlikely(!map)) { |
| 1636 | DMERR_LIMIT("%s: mapping table unavailable, erroring io", |
| 1637 | dm_device_name(md)); |
| 1638 | bio_io_error(bio); |
| 1639 | goto out; |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 1640 | } |
| 1641 | |
Mike Snitzer | b2abdb1 | 2020-09-30 13:45:20 -0400 | [diff] [blame] | 1642 | /* If suspended, queue this IO for later */ |
Mikulas Patocka | af7e466 | 2009-04-09 00:27:16 +0100 | [diff] [blame] | 1643 | if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) { |
Konstantin Khlebnikov | 6abc494 | 2020-09-23 16:06:52 -0400 | [diff] [blame] | 1644 | if (bio->bi_opf & REQ_NOWAIT) |
| 1645 | bio_wouldblock_error(bio); |
Mike Snitzer | b2abdb1 | 2020-09-30 13:45:20 -0400 | [diff] [blame] | 1646 | else if (bio->bi_opf & REQ_RAHEAD) |
Alasdair G Kergon | 54d9a1b | 2009-04-09 00:27:14 +0100 | [diff] [blame] | 1647 | bio_io_error(bio); |
Mike Snitzer | b2abdb1 | 2020-09-30 13:45:20 -0400 | [diff] [blame] | 1648 | else |
| 1649 | queue_io(md, bio); |
| 1650 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | } |
| 1652 | |
Mike Snitzer | b2abdb1 | 2020-09-30 13:45:20 -0400 | [diff] [blame] | 1653 | /* |
| 1654 | * Use blk_queue_split() for abnormal IO (e.g. discard, writesame, etc) |
| 1655 | * otherwise associated queue_limits won't be imposed. |
| 1656 | */ |
| 1657 | if (is_abnormal_io(bio)) |
| 1658 | blk_queue_split(&bio); |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1659 | |
Mike Snitzer | 9c37de2 | 2020-10-07 15:15:08 -0400 | [diff] [blame] | 1660 | ret = __split_and_process_bio(md, map, bio); |
Mike Snitzer | b2abdb1 | 2020-09-30 13:45:20 -0400 | [diff] [blame] | 1661 | out: |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1662 | dm_put_live_table(md, srcu_idx); |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1663 | return ret; |
| 1664 | } |
| 1665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | /*----------------------------------------------------------------- |
| 1667 | * An IDR is used to keep track of allocated minor numbers. |
| 1668 | *---------------------------------------------------------------*/ |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 1669 | static void free_minor(int minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | { |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1671 | spin_lock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | idr_remove(&_minor_idr, minor); |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1673 | spin_unlock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | } |
| 1675 | |
| 1676 | /* |
| 1677 | * See if the device with a specific minor # is free. |
| 1678 | */ |
Frederik Deweerdt | cf13ab8 | 2008-04-24 22:10:59 +0100 | [diff] [blame] | 1679 | static int specific_minor(int minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | { |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1681 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | |
| 1683 | if (minor >= (1 << MINORBITS)) |
| 1684 | return -EINVAL; |
| 1685 | |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1686 | idr_preload(GFP_KERNEL); |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1687 | spin_lock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1689 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1691 | spin_unlock(&_minor_lock); |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1692 | idr_preload_end(); |
| 1693 | if (r < 0) |
| 1694 | return r == -ENOSPC ? -EBUSY : r; |
| 1695 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | } |
| 1697 | |
Frederik Deweerdt | cf13ab8 | 2008-04-24 22:10:59 +0100 | [diff] [blame] | 1698 | static int next_free_minor(int *minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | { |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1700 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1702 | idr_preload(GFP_KERNEL); |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1703 | spin_lock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1705 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1707 | spin_unlock(&_minor_lock); |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1708 | idr_preload_end(); |
| 1709 | if (r < 0) |
| 1710 | return r; |
| 1711 | *minor = r; |
| 1712 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | } |
| 1714 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 1715 | static const struct block_device_operations dm_blk_dops; |
Mike Snitzer | 681cc5e | 2020-10-07 16:41:01 -0400 | [diff] [blame] | 1716 | static const struct block_device_operations dm_rq_blk_dops; |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1717 | static const struct dax_operations dm_dax_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | |
Mikulas Patocka | 53d5914 | 2009-04-02 19:55:37 +0100 | [diff] [blame] | 1719 | static void dm_wq_work(struct work_struct *work); |
| 1720 | |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1721 | static void cleanup_mapped_device(struct mapped_device *md) |
| 1722 | { |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1723 | if (md->wq) |
| 1724 | destroy_workqueue(md->wq); |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 1725 | bioset_exit(&md->bs); |
| 1726 | bioset_exit(&md->io_bs); |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1727 | |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1728 | if (md->dax_dev) { |
| 1729 | kill_dax(md->dax_dev); |
| 1730 | put_dax(md->dax_dev); |
| 1731 | md->dax_dev = NULL; |
| 1732 | } |
| 1733 | |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1734 | if (md->disk) { |
| 1735 | spin_lock(&_minor_lock); |
| 1736 | md->disk->private_data = NULL; |
| 1737 | spin_unlock(&_minor_lock); |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1738 | del_gendisk(md->disk); |
| 1739 | put_disk(md->disk); |
| 1740 | } |
| 1741 | |
| 1742 | if (md->queue) |
| 1743 | blk_cleanup_queue(md->queue); |
| 1744 | |
Tahsin Erdogan | d09960b | 2016-10-10 05:35:19 -0700 | [diff] [blame] | 1745 | cleanup_srcu_struct(&md->io_barrier); |
| 1746 | |
Mike Snitzer | d5ffebd | 2018-01-05 21:17:20 -0500 | [diff] [blame] | 1747 | mutex_destroy(&md->suspend_lock); |
| 1748 | mutex_destroy(&md->type_lock); |
| 1749 | mutex_destroy(&md->table_devices_lock); |
| 1750 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 1751 | dm_mq_cleanup_mapped_device(md); |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1752 | } |
| 1753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | /* |
| 1755 | * Allocate and initialise a blank device with a given minor. |
| 1756 | */ |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 1757 | static struct mapped_device *alloc_dev(int minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | { |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 1759 | int r, numa_node_id = dm_get_numa_node(); |
| 1760 | struct mapped_device *md; |
Jeff Mahoney | ba61fdd | 2006-06-26 00:27:21 -0700 | [diff] [blame] | 1761 | void *old_md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | |
Mikulas Patocka | 856eb09 | 2017-10-31 19:33:02 -0400 | [diff] [blame] | 1763 | md = kvzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | if (!md) { |
| 1765 | DMWARN("unable to allocate device, out of memory."); |
| 1766 | return NULL; |
| 1767 | } |
| 1768 | |
Jeff Mahoney | 10da4f7 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1769 | if (!try_module_get(THIS_MODULE)) |
Milan Broz | 6ed7ade | 2008-02-08 02:10:19 +0000 | [diff] [blame] | 1770 | goto bad_module_get; |
Jeff Mahoney | 10da4f7 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1771 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | /* get a minor number for the dev */ |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 1773 | if (minor == DM_ANY_MINOR) |
Frederik Deweerdt | cf13ab8 | 2008-04-24 22:10:59 +0100 | [diff] [blame] | 1774 | r = next_free_minor(&minor); |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 1775 | else |
Frederik Deweerdt | cf13ab8 | 2008-04-24 22:10:59 +0100 | [diff] [blame] | 1776 | r = specific_minor(minor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | if (r < 0) |
Milan Broz | 6ed7ade | 2008-02-08 02:10:19 +0000 | [diff] [blame] | 1778 | goto bad_minor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1780 | r = init_srcu_struct(&md->io_barrier); |
| 1781 | if (r < 0) |
| 1782 | goto bad_io_barrier; |
| 1783 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 1784 | md->numa_node_id = numa_node_id; |
Mike Snitzer | 591ddcfc | 2016-01-31 12:05:42 -0500 | [diff] [blame] | 1785 | md->init_tio_pdu = false; |
Mike Snitzer | a5664da | 2010-08-12 04:14:01 +0100 | [diff] [blame] | 1786 | md->type = DM_TYPE_NONE; |
Daniel Walker | e61290a | 2008-02-08 02:10:08 +0000 | [diff] [blame] | 1787 | mutex_init(&md->suspend_lock); |
Mike Snitzer | a5664da | 2010-08-12 04:14:01 +0100 | [diff] [blame] | 1788 | mutex_init(&md->type_lock); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 1789 | mutex_init(&md->table_devices_lock); |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 1790 | spin_lock_init(&md->deferred_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | atomic_set(&md->holders, 1); |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 1792 | atomic_set(&md->open_count, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | atomic_set(&md->event_nr, 0); |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 1794 | atomic_set(&md->uevent_seq, 0); |
| 1795 | INIT_LIST_HEAD(&md->uevent_list); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 1796 | INIT_LIST_HEAD(&md->table_devices); |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 1797 | spin_lock_init(&md->uevent_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1798 | |
Mike Snitzer | 47ace7e | 2020-01-27 14:07:23 -0500 | [diff] [blame] | 1799 | /* |
Christoph Hellwig | c62b37d | 2020-07-01 10:59:43 +0200 | [diff] [blame] | 1800 | * default to bio-based until DM table is loaded and md->type |
| 1801 | * established. If request-based table is loaded: blk-mq will |
| 1802 | * override accordingly. |
Mike Snitzer | 47ace7e | 2020-01-27 14:07:23 -0500 | [diff] [blame] | 1803 | */ |
Christoph Hellwig | c62b37d | 2020-07-01 10:59:43 +0200 | [diff] [blame] | 1804 | md->queue = blk_alloc_queue(numa_node_id); |
Christoph Hellwig | 3d745ea | 2020-03-27 09:30:11 +0100 | [diff] [blame] | 1805 | if (!md->queue) |
| 1806 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | |
Mike Snitzer | c12c9a3 | 2018-01-12 09:32:21 -0500 | [diff] [blame] | 1808 | md->disk = alloc_disk_node(1, md->numa_node_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | if (!md->disk) |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1810 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | |
Jeff Mahoney | f0b0411 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1812 | init_waitqueue_head(&md->wait); |
Mikulas Patocka | 53d5914 | 2009-04-02 19:55:37 +0100 | [diff] [blame] | 1813 | INIT_WORK(&md->work, dm_wq_work); |
Jeff Mahoney | f0b0411 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1814 | init_waitqueue_head(&md->eventq); |
Mikulas Patocka | 2995fa7 | 2014-01-13 19:37:54 -0500 | [diff] [blame] | 1815 | init_completion(&md->kobj_holder.completion); |
Jeff Mahoney | f0b0411 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | md->disk->major = _major; |
| 1818 | md->disk->first_minor = minor; |
| 1819 | md->disk->fops = &dm_blk_dops; |
| 1820 | md->disk->queue = md->queue; |
| 1821 | md->disk->private_data = md; |
| 1822 | sprintf(md->disk->disk_name, "dm-%d", minor); |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1823 | |
Dan Williams | 976431b | 2018-03-29 17:22:13 -0700 | [diff] [blame] | 1824 | if (IS_ENABLED(CONFIG_DAX_DRIVER)) { |
Pankaj Gupta | fefc1d9 | 2019-07-05 19:33:24 +0530 | [diff] [blame] | 1825 | md->dax_dev = alloc_dax(md, md->disk->disk_name, |
| 1826 | &dm_dax_ops, 0); |
Vivek Goyal | 4e4ced9 | 2020-04-01 12:11:25 -0400 | [diff] [blame] | 1827 | if (IS_ERR(md->dax_dev)) |
Dan Williams | 976431b | 2018-03-29 17:22:13 -0700 | [diff] [blame] | 1828 | goto bad; |
| 1829 | } |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 1830 | |
Mike Snitzer | c100ec4 | 2018-01-08 20:03:04 -0500 | [diff] [blame] | 1831 | add_disk_no_queue_reg(md->disk); |
Mike Anderson | 7e51f25 | 2006-03-27 01:17:52 -0800 | [diff] [blame] | 1832 | format_dev_t(md->name, MKDEV(_major, minor)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | |
Tejun Heo | 670368a | 2013-07-30 08:40:21 -0400 | [diff] [blame] | 1834 | md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0); |
Milan Broz | 304f3f6 | 2008-02-08 02:11:17 +0000 | [diff] [blame] | 1835 | if (!md->wq) |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1836 | goto bad; |
Milan Broz | 304f3f6 | 2008-02-08 02:11:17 +0000 | [diff] [blame] | 1837 | |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 1838 | dm_stats_init(&md->stats); |
| 1839 | |
Jeff Mahoney | ba61fdd | 2006-06-26 00:27:21 -0700 | [diff] [blame] | 1840 | /* Populate the mapping, nobody knows we exist yet */ |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1841 | spin_lock(&_minor_lock); |
Jeff Mahoney | ba61fdd | 2006-06-26 00:27:21 -0700 | [diff] [blame] | 1842 | old_md = idr_replace(&_minor_idr, md, minor); |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1843 | spin_unlock(&_minor_lock); |
Jeff Mahoney | ba61fdd | 2006-06-26 00:27:21 -0700 | [diff] [blame] | 1844 | |
| 1845 | BUG_ON(old_md != MINOR_ALLOCED); |
| 1846 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | return md; |
| 1848 | |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1849 | bad: |
| 1850 | cleanup_mapped_device(md); |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1851 | bad_io_barrier: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | free_minor(minor); |
Milan Broz | 6ed7ade | 2008-02-08 02:10:19 +0000 | [diff] [blame] | 1853 | bad_minor: |
Jeff Mahoney | 10da4f7 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1854 | module_put(THIS_MODULE); |
Milan Broz | 6ed7ade | 2008-02-08 02:10:19 +0000 | [diff] [blame] | 1855 | bad_module_get: |
Mikulas Patocka | 856eb09 | 2017-10-31 19:33:02 -0400 | [diff] [blame] | 1856 | kvfree(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | return NULL; |
| 1858 | } |
| 1859 | |
Jun'ichi Nomura | ae9da83 | 2007-10-19 22:38:43 +0100 | [diff] [blame] | 1860 | static void unlock_fs(struct mapped_device *md); |
| 1861 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | static void free_dev(struct mapped_device *md) |
| 1863 | { |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 1864 | int minor = MINOR(disk_devt(md->disk)); |
Jun'ichi Nomura | 63d94e4 | 2006-02-24 13:04:25 -0800 | [diff] [blame] | 1865 | |
Mikulas Patocka | 32a926d | 2009-06-22 10:12:17 +0100 | [diff] [blame] | 1866 | unlock_fs(md); |
Keith Busch | 2eb6e1e | 2014-10-17 17:46:36 -0600 | [diff] [blame] | 1867 | |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1868 | cleanup_mapped_device(md); |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1869 | |
| 1870 | free_table_devices(&md->table_devices); |
| 1871 | dm_stats_cleanup(&md->stats); |
Mike Snitzer | 63a4f06 | 2015-03-23 17:01:43 -0400 | [diff] [blame] | 1872 | free_minor(minor); |
| 1873 | |
Jeff Mahoney | 10da4f7 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1874 | module_put(THIS_MODULE); |
Mikulas Patocka | 856eb09 | 2017-10-31 19:33:02 -0400 | [diff] [blame] | 1875 | kvfree(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | } |
| 1877 | |
Jens Axboe | 2a2a4c5 | 2018-06-07 14:42:06 -0600 | [diff] [blame] | 1878 | static int __bind_mempools(struct mapped_device *md, struct dm_table *t) |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1879 | { |
Mikulas Patocka | c0820cf | 2012-12-21 20:23:38 +0000 | [diff] [blame] | 1880 | struct dm_md_mempools *p = dm_table_get_md_mempools(t); |
Jens Axboe | 2a2a4c5 | 2018-06-07 14:42:06 -0600 | [diff] [blame] | 1881 | int ret = 0; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1882 | |
Mike Snitzer | 0776aa0 | 2017-12-08 14:40:52 -0500 | [diff] [blame] | 1883 | if (dm_table_bio_based(t)) { |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 1884 | /* |
| 1885 | * The md may already have mempools that need changing. |
| 1886 | * If so, reload bioset because front_pad may have changed |
| 1887 | * because a different table was loaded. |
| 1888 | */ |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 1889 | bioset_exit(&md->bs); |
| 1890 | bioset_exit(&md->io_bs); |
Mike Snitzer | 0776aa0 | 2017-12-08 14:40:52 -0500 | [diff] [blame] | 1891 | |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 1892 | } else if (bioset_initialized(&md->bs)) { |
Mike Snitzer | 4e6e36c | 2015-06-26 09:42:57 -0400 | [diff] [blame] | 1893 | /* |
| 1894 | * There's no need to reload with request-based dm |
| 1895 | * because the size of front_pad doesn't change. |
| 1896 | * Note for future: If you are to reload bioset, |
| 1897 | * prep-ed requests in the queue may refer |
| 1898 | * to bio from the old bioset, so you must walk |
| 1899 | * through the queue to unprep. |
| 1900 | */ |
| 1901 | goto out; |
Mikulas Patocka | c0820cf | 2012-12-21 20:23:38 +0000 | [diff] [blame] | 1902 | } |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1903 | |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 1904 | BUG_ON(!p || |
| 1905 | bioset_initialized(&md->bs) || |
| 1906 | bioset_initialized(&md->io_bs)); |
Mike Snitzer | cbc4e3c | 2015-04-27 16:37:50 -0400 | [diff] [blame] | 1907 | |
Jens Axboe | 2a2a4c5 | 2018-06-07 14:42:06 -0600 | [diff] [blame] | 1908 | ret = bioset_init_from_src(&md->bs, &p->bs); |
| 1909 | if (ret) |
| 1910 | goto out; |
| 1911 | ret = bioset_init_from_src(&md->io_bs, &p->io_bs); |
| 1912 | if (ret) |
| 1913 | bioset_exit(&md->bs); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1914 | out: |
Mike Snitzer | 0223334 | 2015-03-10 23:49:26 -0400 | [diff] [blame] | 1915 | /* mempool bind completed, no longer need any mempools in the table */ |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1916 | dm_table_free_md_mempools(t); |
Jens Axboe | 2a2a4c5 | 2018-06-07 14:42:06 -0600 | [diff] [blame] | 1917 | return ret; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1918 | } |
| 1919 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | /* |
| 1921 | * Bind a table to the device. |
| 1922 | */ |
| 1923 | static void event_callback(void *context) |
| 1924 | { |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 1925 | unsigned long flags; |
| 1926 | LIST_HEAD(uevents); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1927 | struct mapped_device *md = (struct mapped_device *) context; |
| 1928 | |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 1929 | spin_lock_irqsave(&md->uevent_lock, flags); |
| 1930 | list_splice_init(&md->uevent_list, &uevents); |
| 1931 | spin_unlock_irqrestore(&md->uevent_lock, flags); |
| 1932 | |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 1933 | dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 1934 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | atomic_inc(&md->event_nr); |
| 1936 | wake_up(&md->eventq); |
Mikulas Patocka | 62e0824 | 2017-09-20 07:29:49 -0400 | [diff] [blame] | 1937 | dm_issue_global_event(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | } |
| 1939 | |
Mike Snitzer | c217649 | 2011-01-13 19:53:46 +0000 | [diff] [blame] | 1940 | /* |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 1941 | * Returns old map, which caller must destroy. |
| 1942 | */ |
| 1943 | static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, |
| 1944 | struct queue_limits *limits) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | { |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 1946 | struct dm_table *old_map; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1947 | struct request_queue *q = md->queue; |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1948 | bool request_based = dm_table_request_based(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | sector_t size; |
Jens Axboe | 2a2a4c5 | 2018-06-07 14:42:06 -0600 | [diff] [blame] | 1950 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | |
Bart Van Assche | 5a8f1f8 | 2016-08-31 15:17:04 -0700 | [diff] [blame] | 1952 | lockdep_assert_held(&md->suspend_lock); |
| 1953 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | size = dm_table_get_size(t); |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1955 | |
| 1956 | /* |
| 1957 | * Wipe any geometry if the size of the table changed. |
| 1958 | */ |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 1959 | if (size != dm_get_size(md)) |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1960 | memset(&md->geometry, 0, sizeof(md->geometry)); |
| 1961 | |
Christoph Hellwig | f64d9b2 | 2020-11-16 15:57:03 +0100 | [diff] [blame] | 1962 | set_capacity_and_notify(md->disk, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 1964 | dm_table_event_callback(t, event_callback, md); |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 1965 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1966 | /* |
| 1967 | * The queue hasn't been stopped yet, if the old table type wasn't |
| 1968 | * for request-based during suspension. So stop it to prevent |
| 1969 | * I/O mapping before resume. |
| 1970 | * This must be done before setting the queue restrictions, |
| 1971 | * because request-based dm may be run just after the setting. |
| 1972 | */ |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1973 | if (request_based) |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 1974 | dm_stop_queue(q); |
Mike Snitzer | 978e51b | 2017-12-09 15:16:42 -0500 | [diff] [blame] | 1975 | |
Mike Snitzer | 9c37de2 | 2020-10-07 15:15:08 -0400 | [diff] [blame] | 1976 | if (request_based) { |
Mike Snitzer | 16f1226 | 2016-01-31 17:22:27 -0500 | [diff] [blame] | 1977 | /* |
Mike Snitzer | 9c37de2 | 2020-10-07 15:15:08 -0400 | [diff] [blame] | 1978 | * Leverage the fact that request-based DM targets are |
| 1979 | * immutable singletons - used to optimize dm_mq_queue_rq. |
Mike Snitzer | 16f1226 | 2016-01-31 17:22:27 -0500 | [diff] [blame] | 1980 | */ |
| 1981 | md->immutable_target = dm_table_get_immutable_target(t); |
| 1982 | } |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1983 | |
Jens Axboe | 2a2a4c5 | 2018-06-07 14:42:06 -0600 | [diff] [blame] | 1984 | ret = __bind_mempools(md, t); |
| 1985 | if (ret) { |
| 1986 | old_map = ERR_PTR(ret); |
| 1987 | goto out; |
| 1988 | } |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1989 | |
Eric Dumazet | a12f5d4 | 2014-11-23 09:34:29 -0800 | [diff] [blame] | 1990 | old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
Mike Snitzer | 1d3aa6f | 2016-02-22 14:14:24 -0500 | [diff] [blame] | 1991 | rcu_assign_pointer(md->map, (void *)t); |
Alasdair G Kergon | 36a0456 | 2011-10-31 20:19:04 +0000 | [diff] [blame] | 1992 | md->immutable_target_type = dm_table_get_immutable_target_type(t); |
| 1993 | |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1994 | dm_table_set_restrictions(t, q, limits); |
Hannes Reinecke | 41abc4e | 2014-11-05 14:35:50 +0100 | [diff] [blame] | 1995 | if (old_map) |
| 1996 | dm_sync_table(md); |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 1997 | |
Jens Axboe | 2a2a4c5 | 2018-06-07 14:42:06 -0600 | [diff] [blame] | 1998 | out: |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 1999 | return old_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | } |
| 2001 | |
Alasdair G Kergon | a794015 | 2009-12-10 23:52:23 +0000 | [diff] [blame] | 2002 | /* |
| 2003 | * Returns unbound table for the caller to free. |
| 2004 | */ |
| 2005 | static struct dm_table *__unbind(struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | { |
Eric Dumazet | a12f5d4 | 2014-11-23 09:34:29 -0800 | [diff] [blame] | 2007 | struct dm_table *map = rcu_dereference_protected(md->map, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | |
| 2009 | if (!map) |
Alasdair G Kergon | a794015 | 2009-12-10 23:52:23 +0000 | [diff] [blame] | 2010 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | |
| 2012 | dm_table_event_callback(map, NULL, NULL); |
Monam Agarwal | 9cdb852 | 2014-03-23 23:58:27 +0530 | [diff] [blame] | 2013 | RCU_INIT_POINTER(md->map, NULL); |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2014 | dm_sync_table(md); |
Alasdair G Kergon | a794015 | 2009-12-10 23:52:23 +0000 | [diff] [blame] | 2015 | |
| 2016 | return map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | } |
| 2018 | |
| 2019 | /* |
| 2020 | * Constructor for a new device. |
| 2021 | */ |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 2022 | int dm_create(int minor, struct mapped_device **result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | { |
Mike Snitzer | c12c9a3 | 2018-01-12 09:32:21 -0500 | [diff] [blame] | 2024 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | struct mapped_device *md; |
| 2026 | |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 2027 | md = alloc_dev(minor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | if (!md) |
| 2029 | return -ENXIO; |
| 2030 | |
Mike Snitzer | c12c9a3 | 2018-01-12 09:32:21 -0500 | [diff] [blame] | 2031 | r = dm_sysfs_init(md); |
| 2032 | if (r) { |
| 2033 | free_dev(md); |
| 2034 | return r; |
| 2035 | } |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2036 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | *result = md; |
| 2038 | return 0; |
| 2039 | } |
| 2040 | |
Mike Snitzer | a5664da | 2010-08-12 04:14:01 +0100 | [diff] [blame] | 2041 | /* |
| 2042 | * Functions to manage md->type. |
| 2043 | * All are required to hold md->type_lock. |
| 2044 | */ |
| 2045 | void dm_lock_md_type(struct mapped_device *md) |
| 2046 | { |
| 2047 | mutex_lock(&md->type_lock); |
| 2048 | } |
| 2049 | |
| 2050 | void dm_unlock_md_type(struct mapped_device *md) |
| 2051 | { |
| 2052 | mutex_unlock(&md->type_lock); |
| 2053 | } |
| 2054 | |
Bart Van Assche | 7e0d574 | 2017-04-27 10:11:23 -0700 | [diff] [blame] | 2055 | void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type) |
Mike Snitzer | a5664da | 2010-08-12 04:14:01 +0100 | [diff] [blame] | 2056 | { |
Mike Snitzer | 00c4fc3 | 2013-08-27 18:57:03 -0400 | [diff] [blame] | 2057 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
Mike Snitzer | a5664da | 2010-08-12 04:14:01 +0100 | [diff] [blame] | 2058 | md->type = type; |
| 2059 | } |
| 2060 | |
Bart Van Assche | 7e0d574 | 2017-04-27 10:11:23 -0700 | [diff] [blame] | 2061 | enum dm_queue_mode dm_get_md_type(struct mapped_device *md) |
Mike Snitzer | a5664da | 2010-08-12 04:14:01 +0100 | [diff] [blame] | 2062 | { |
| 2063 | return md->type; |
| 2064 | } |
| 2065 | |
Alasdair G Kergon | 36a0456 | 2011-10-31 20:19:04 +0000 | [diff] [blame] | 2066 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md) |
| 2067 | { |
| 2068 | return md->immutable_target_type; |
| 2069 | } |
| 2070 | |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 2071 | /* |
Mike Snitzer | f84cb8a | 2013-09-19 12:13:58 -0400 | [diff] [blame] | 2072 | * The queue_limits are only valid as long as you have a reference |
| 2073 | * count on 'md'. |
| 2074 | */ |
| 2075 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md) |
| 2076 | { |
| 2077 | BUG_ON(!atomic_read(&md->holders)); |
| 2078 | return &md->queue->limits; |
| 2079 | } |
| 2080 | EXPORT_SYMBOL_GPL(dm_get_queue_limits); |
| 2081 | |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 2082 | /* |
| 2083 | * Setup the DM device's queue based on md's type |
| 2084 | */ |
Mike Snitzer | 591ddcfc | 2016-01-31 12:05:42 -0500 | [diff] [blame] | 2085 | int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t) |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 2086 | { |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 2087 | int r; |
Mike Snitzer | c100ec4 | 2018-01-08 20:03:04 -0500 | [diff] [blame] | 2088 | struct queue_limits limits; |
Bart Van Assche | 7e0d574 | 2017-04-27 10:11:23 -0700 | [diff] [blame] | 2089 | enum dm_queue_mode type = dm_get_md_type(md); |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 2090 | |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 2091 | switch (type) { |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 2092 | case DM_TYPE_REQUEST_BASED: |
Mike Snitzer | 681cc5e | 2020-10-07 16:41:01 -0400 | [diff] [blame] | 2093 | md->disk->fops = &dm_rq_blk_dops; |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 2094 | r = dm_mq_init_request_queue(md, t); |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 2095 | if (r) { |
Mike Snitzer | 681cc5e | 2020-10-07 16:41:01 -0400 | [diff] [blame] | 2096 | DMERR("Cannot initialize queue for request-based dm mapped device"); |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 2097 | return r; |
| 2098 | } |
| 2099 | break; |
| 2100 | case DM_TYPE_BIO_BASED: |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 2101 | case DM_TYPE_DAX_BIO_BASED: |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 2102 | break; |
Bart Van Assche | 7e0d574 | 2017-04-27 10:11:23 -0700 | [diff] [blame] | 2103 | case DM_TYPE_NONE: |
| 2104 | WARN_ON_ONCE(true); |
| 2105 | break; |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 2106 | } |
| 2107 | |
Mike Snitzer | c100ec4 | 2018-01-08 20:03:04 -0500 | [diff] [blame] | 2108 | r = dm_calculate_queue_limits(t, &limits); |
| 2109 | if (r) { |
| 2110 | DMERR("Cannot calculate initial queue limits"); |
| 2111 | return r; |
| 2112 | } |
| 2113 | dm_table_set_restrictions(t, md->queue, &limits); |
| 2114 | blk_register_queue(md->disk); |
| 2115 | |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 2116 | return 0; |
| 2117 | } |
| 2118 | |
Mikulas Patocka | 2bec1f4 | 2015-02-17 14:30:53 -0500 | [diff] [blame] | 2119 | struct mapped_device *dm_get_md(dev_t dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | { |
| 2121 | struct mapped_device *md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | unsigned minor = MINOR(dev); |
| 2123 | |
| 2124 | if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) |
| 2125 | return NULL; |
| 2126 | |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 2127 | spin_lock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | |
| 2129 | md = idr_find(&_minor_idr, minor); |
Mike Snitzer | 49de576 | 2017-11-06 16:40:10 -0500 | [diff] [blame] | 2130 | if (!md || md == MINOR_ALLOCED || (MINOR(disk_devt(dm_disk(md))) != minor) || |
| 2131 | test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { |
| 2132 | md = NULL; |
| 2133 | goto out; |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 2134 | } |
Mike Snitzer | 49de576 | 2017-11-06 16:40:10 -0500 | [diff] [blame] | 2135 | dm_get(md); |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 2136 | out: |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 2137 | spin_unlock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | |
David Teigland | 637842c | 2006-01-06 00:20:00 -0800 | [diff] [blame] | 2139 | return md; |
| 2140 | } |
Alasdair G Kergon | 3cf2e4b | 2011-10-31 20:19:06 +0000 | [diff] [blame] | 2141 | EXPORT_SYMBOL_GPL(dm_get_md); |
David Teigland | d229a95 | 2006-01-06 00:20:01 -0800 | [diff] [blame] | 2142 | |
Alasdair G Kergon | 9ade92a | 2006-03-27 01:17:53 -0800 | [diff] [blame] | 2143 | void *dm_get_mdptr(struct mapped_device *md) |
David Teigland | 637842c | 2006-01-06 00:20:00 -0800 | [diff] [blame] | 2144 | { |
Alasdair G Kergon | 9ade92a | 2006-03-27 01:17:53 -0800 | [diff] [blame] | 2145 | return md->interface_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | } |
| 2147 | |
| 2148 | void dm_set_mdptr(struct mapped_device *md, void *ptr) |
| 2149 | { |
| 2150 | md->interface_ptr = ptr; |
| 2151 | } |
| 2152 | |
| 2153 | void dm_get(struct mapped_device *md) |
| 2154 | { |
| 2155 | atomic_inc(&md->holders); |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 2156 | BUG_ON(test_bit(DMF_FREEING, &md->flags)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | } |
| 2158 | |
Mikulas Patocka | 09ee96b | 2015-02-26 11:41:28 -0500 | [diff] [blame] | 2159 | int dm_hold(struct mapped_device *md) |
| 2160 | { |
| 2161 | spin_lock(&_minor_lock); |
| 2162 | if (test_bit(DMF_FREEING, &md->flags)) { |
| 2163 | spin_unlock(&_minor_lock); |
| 2164 | return -EBUSY; |
| 2165 | } |
| 2166 | dm_get(md); |
| 2167 | spin_unlock(&_minor_lock); |
| 2168 | return 0; |
| 2169 | } |
| 2170 | EXPORT_SYMBOL_GPL(dm_hold); |
| 2171 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 2172 | const char *dm_device_name(struct mapped_device *md) |
| 2173 | { |
| 2174 | return md->name; |
| 2175 | } |
| 2176 | EXPORT_SYMBOL_GPL(dm_device_name); |
| 2177 | |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 2178 | static void __dm_destroy(struct mapped_device *md, bool wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | { |
Mike Anderson | 1134e5ae | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 2180 | struct dm_table *map; |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2181 | int srcu_idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 2183 | might_sleep(); |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 2184 | |
Mike Snitzer | 63a4f06 | 2015-03-23 17:01:43 -0400 | [diff] [blame] | 2185 | spin_lock(&_minor_lock); |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 2186 | idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md)))); |
| 2187 | set_bit(DMF_FREEING, &md->flags); |
| 2188 | spin_unlock(&_minor_lock); |
| 2189 | |
Mike Snitzer | c12c9a3 | 2018-01-12 09:32:21 -0500 | [diff] [blame] | 2190 | blk_set_queue_dying(md->queue); |
Bart Van Assche | 3b785fb | 2016-08-31 15:17:49 -0700 | [diff] [blame] | 2191 | |
Mikulas Patocka | ab7c7bb | 2015-02-27 14:04:27 -0500 | [diff] [blame] | 2192 | /* |
| 2193 | * Take suspend_lock so that presuspend and postsuspend methods |
| 2194 | * do not race with internal suspend. |
| 2195 | */ |
| 2196 | mutex_lock(&md->suspend_lock); |
Junichi Nomura | 2a708cf | 2015-10-01 08:31:51 +0000 | [diff] [blame] | 2197 | map = dm_get_live_table(md, &srcu_idx); |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 2198 | if (!dm_suspended_md(md)) { |
| 2199 | dm_table_presuspend_targets(map); |
Mikulas Patocka | adc0daa | 2020-02-24 10:20:28 +0100 | [diff] [blame] | 2200 | set_bit(DMF_SUSPENDED, &md->flags); |
Mikulas Patocka | 5df96f2 | 2020-07-23 10:42:09 -0400 | [diff] [blame] | 2201 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 2202 | dm_table_postsuspend_targets(map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2203 | } |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2204 | /* dm_put_live_table must be before msleep, otherwise deadlock is possible */ |
| 2205 | dm_put_live_table(md, srcu_idx); |
Junichi Nomura | 2a708cf | 2015-10-01 08:31:51 +0000 | [diff] [blame] | 2206 | mutex_unlock(&md->suspend_lock); |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2207 | |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 2208 | /* |
| 2209 | * Rare, but there may be I/O requests still going to complete, |
| 2210 | * for example. Wait for all references to disappear. |
| 2211 | * No one should increment the reference count of the mapped_device, |
| 2212 | * after the mapped_device state becomes DMF_FREEING. |
| 2213 | */ |
| 2214 | if (wait) |
| 2215 | while (atomic_read(&md->holders)) |
| 2216 | msleep(1); |
| 2217 | else if (atomic_read(&md->holders)) |
| 2218 | DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)", |
| 2219 | dm_device_name(md), atomic_read(&md->holders)); |
| 2220 | |
| 2221 | dm_sysfs_exit(md); |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 2222 | dm_table_destroy(__unbind(md)); |
| 2223 | free_dev(md); |
| 2224 | } |
| 2225 | |
| 2226 | void dm_destroy(struct mapped_device *md) |
| 2227 | { |
| 2228 | __dm_destroy(md, true); |
| 2229 | } |
| 2230 | |
| 2231 | void dm_destroy_immediate(struct mapped_device *md) |
| 2232 | { |
| 2233 | __dm_destroy(md, false); |
| 2234 | } |
| 2235 | |
| 2236 | void dm_put(struct mapped_device *md) |
| 2237 | { |
| 2238 | atomic_dec(&md->holders); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | } |
Edward Goggin | 79eb885 | 2007-05-09 02:32:56 -0700 | [diff] [blame] | 2240 | EXPORT_SYMBOL_GPL(dm_put); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2241 | |
Ming Lei | 8506774 | 2020-06-24 16:00:58 -0400 | [diff] [blame] | 2242 | static bool md_in_flight_bios(struct mapped_device *md) |
| 2243 | { |
| 2244 | int cpu; |
Christoph Hellwig | 8446fe9 | 2020-11-24 09:36:54 +0100 | [diff] [blame] | 2245 | struct block_device *part = dm_disk(md)->part0; |
Ming Lei | 8506774 | 2020-06-24 16:00:58 -0400 | [diff] [blame] | 2246 | long sum = 0; |
| 2247 | |
| 2248 | for_each_possible_cpu(cpu) { |
| 2249 | sum += part_stat_local_read_cpu(part, in_flight[0], cpu); |
| 2250 | sum += part_stat_local_read_cpu(part, in_flight[1], cpu); |
| 2251 | } |
| 2252 | |
| 2253 | return sum != 0; |
| 2254 | } |
| 2255 | |
| 2256 | static int dm_wait_for_bios_completion(struct mapped_device *md, long task_state) |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2257 | { |
| 2258 | int r = 0; |
Bart Van Assche | 9f4c3f8 | 2016-08-31 15:16:43 -0700 | [diff] [blame] | 2259 | DEFINE_WAIT(wait); |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2260 | |
Ming Lei | 8506774 | 2020-06-24 16:00:58 -0400 | [diff] [blame] | 2261 | while (true) { |
Bart Van Assche | 9f4c3f8 | 2016-08-31 15:16:43 -0700 | [diff] [blame] | 2262 | prepare_to_wait(&md->wait, &wait, task_state); |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2263 | |
Ming Lei | 8506774 | 2020-06-24 16:00:58 -0400 | [diff] [blame] | 2264 | if (!md_in_flight_bios(md)) |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2265 | break; |
| 2266 | |
Bart Van Assche | e3fabdf | 2016-08-31 15:16:22 -0700 | [diff] [blame] | 2267 | if (signal_pending_state(task_state, current)) { |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2268 | r = -EINTR; |
| 2269 | break; |
| 2270 | } |
| 2271 | |
| 2272 | io_schedule(); |
| 2273 | } |
Bart Van Assche | 9f4c3f8 | 2016-08-31 15:16:43 -0700 | [diff] [blame] | 2274 | finish_wait(&md->wait, &wait); |
Mikulas Patocka | b44ebeb | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 2275 | |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2276 | return r; |
| 2277 | } |
| 2278 | |
Ming Lei | 8506774 | 2020-06-24 16:00:58 -0400 | [diff] [blame] | 2279 | static int dm_wait_for_completion(struct mapped_device *md, long task_state) |
| 2280 | { |
| 2281 | int r = 0; |
| 2282 | |
| 2283 | if (!queue_is_mq(md->queue)) |
| 2284 | return dm_wait_for_bios_completion(md, task_state); |
| 2285 | |
| 2286 | while (true) { |
| 2287 | if (!blk_mq_queue_inflight(md->queue)) |
| 2288 | break; |
| 2289 | |
| 2290 | if (signal_pending_state(task_state, current)) { |
| 2291 | r = -EINTR; |
| 2292 | break; |
| 2293 | } |
| 2294 | |
| 2295 | msleep(5); |
| 2296 | } |
| 2297 | |
| 2298 | return r; |
| 2299 | } |
| 2300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | /* |
| 2302 | * Process the deferred bios |
| 2303 | */ |
Mikulas Patocka | ef20858 | 2009-04-02 19:55:38 +0100 | [diff] [blame] | 2304 | static void dm_wq_work(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | { |
Mike Snitzer | 0c2915b | 2020-09-28 13:41:36 -0400 | [diff] [blame] | 2306 | struct mapped_device *md = container_of(work, struct mapped_device, work); |
| 2307 | struct bio *bio; |
Mikulas Patocka | ef20858 | 2009-04-02 19:55:38 +0100 | [diff] [blame] | 2308 | |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2309 | while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
Alasdair G Kergon | df12ee9 | 2009-04-09 00:27:13 +0100 | [diff] [blame] | 2310 | spin_lock_irq(&md->deferred_lock); |
Mike Snitzer | 0c2915b | 2020-09-28 13:41:36 -0400 | [diff] [blame] | 2311 | bio = bio_list_pop(&md->deferred); |
Alasdair G Kergon | df12ee9 | 2009-04-09 00:27:13 +0100 | [diff] [blame] | 2312 | spin_unlock_irq(&md->deferred_lock); |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 2313 | |
Mike Snitzer | 0c2915b | 2020-09-28 13:41:36 -0400 | [diff] [blame] | 2314 | if (!bio) |
Alasdair G Kergon | df12ee9 | 2009-04-09 00:27:13 +0100 | [diff] [blame] | 2315 | break; |
Alasdair G Kergon | df12ee9 | 2009-04-09 00:27:13 +0100 | [diff] [blame] | 2316 | |
Mike Snitzer | 0c2915b | 2020-09-28 13:41:36 -0400 | [diff] [blame] | 2317 | submit_bio_noacct(bio); |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 2318 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | } |
| 2320 | |
Mikulas Patocka | 9a1fb46 | 2009-04-02 19:55:36 +0100 | [diff] [blame] | 2321 | static void dm_queue_flush(struct mapped_device *md) |
Milan Broz | 304f3f6 | 2008-02-08 02:11:17 +0000 | [diff] [blame] | 2322 | { |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2323 | clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 2324 | smp_mb__after_atomic(); |
Mikulas Patocka | 53d5914 | 2009-04-02 19:55:37 +0100 | [diff] [blame] | 2325 | queue_work(md->wq, &md->work); |
Milan Broz | 304f3f6 | 2008-02-08 02:11:17 +0000 | [diff] [blame] | 2326 | } |
| 2327 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | /* |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2329 | * Swap in a new table, returning the old one for the caller to destroy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2330 | */ |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2331 | struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | { |
Mike Christie | 87eb5b2 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2333 | struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 2334 | struct queue_limits limits; |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2335 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | |
Daniel Walker | e61290a | 2008-02-08 02:10:08 +0000 | [diff] [blame] | 2337 | mutex_lock(&md->suspend_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2338 | |
| 2339 | /* device must be suspended */ |
Kiyoshi Ueda | 4f186f8 | 2009-12-10 23:52:26 +0000 | [diff] [blame] | 2340 | if (!dm_suspended_md(md)) |
Alasdair G Kergon | 93c534a | 2005-07-12 15:53:05 -0700 | [diff] [blame] | 2341 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | |
Mike Snitzer | 3ae7065 | 2012-09-26 23:45:45 +0100 | [diff] [blame] | 2343 | /* |
| 2344 | * If the new table has no data devices, retain the existing limits. |
| 2345 | * This helps multipath with queue_if_no_path if all paths disappear, |
| 2346 | * then new I/O is queued based on these limits, and then some paths |
| 2347 | * reappear. |
| 2348 | */ |
| 2349 | if (dm_table_has_no_data_devices(table)) { |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2350 | live_map = dm_get_live_table_fast(md); |
Mike Snitzer | 3ae7065 | 2012-09-26 23:45:45 +0100 | [diff] [blame] | 2351 | if (live_map) |
| 2352 | limits = md->queue->limits; |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2353 | dm_put_live_table_fast(md); |
Mike Snitzer | 3ae7065 | 2012-09-26 23:45:45 +0100 | [diff] [blame] | 2354 | } |
| 2355 | |
Mike Christie | 87eb5b2 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2356 | if (!live_map) { |
| 2357 | r = dm_calculate_queue_limits(table, &limits); |
| 2358 | if (r) { |
| 2359 | map = ERR_PTR(r); |
| 2360 | goto out; |
| 2361 | } |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2362 | } |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 2363 | |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2364 | map = __bind(md, table, &limits); |
Mikulas Patocka | 62e0824 | 2017-09-20 07:29:49 -0400 | [diff] [blame] | 2365 | dm_issue_global_event(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2366 | |
Alasdair G Kergon | 93c534a | 2005-07-12 15:53:05 -0700 | [diff] [blame] | 2367 | out: |
Daniel Walker | e61290a | 2008-02-08 02:10:08 +0000 | [diff] [blame] | 2368 | mutex_unlock(&md->suspend_lock); |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2369 | return map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | } |
| 2371 | |
| 2372 | /* |
| 2373 | * Functions to lock and unlock any filesystem running on the |
| 2374 | * device. |
| 2375 | */ |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2376 | static int lock_fs(struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2377 | { |
Alasdair G Kergon | e39e2e9 | 2006-01-06 00:20:05 -0800 | [diff] [blame] | 2378 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | |
Christoph Hellwig | 040f04b | 2020-11-24 11:54:06 +0100 | [diff] [blame] | 2380 | WARN_ON(test_bit(DMF_FROZEN, &md->flags)); |
Alasdair G Kergon | dfbe03f | 2005-05-05 16:16:04 -0700 | [diff] [blame] | 2381 | |
Christoph Hellwig | 977115c | 2020-11-26 10:41:07 +0100 | [diff] [blame] | 2382 | r = freeze_bdev(md->disk->part0); |
Christoph Hellwig | 040f04b | 2020-11-24 11:54:06 +0100 | [diff] [blame] | 2383 | if (!r) |
| 2384 | set_bit(DMF_FROZEN, &md->flags); |
| 2385 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2386 | } |
| 2387 | |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2388 | static void unlock_fs(struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2389 | { |
Alasdair G Kergon | aa8d7c2 | 2006-01-06 00:20:06 -0800 | [diff] [blame] | 2390 | if (!test_bit(DMF_FROZEN, &md->flags)) |
| 2391 | return; |
Christoph Hellwig | 977115c | 2020-11-26 10:41:07 +0100 | [diff] [blame] | 2392 | thaw_bdev(md->disk->part0); |
Alasdair G Kergon | aa8d7c2 | 2006-01-06 00:20:06 -0800 | [diff] [blame] | 2393 | clear_bit(DMF_FROZEN, &md->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2394 | } |
| 2395 | |
| 2396 | /* |
Bart Van Assche | b48633f | 2016-08-31 15:16:02 -0700 | [diff] [blame] | 2397 | * @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG |
| 2398 | * @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE |
| 2399 | * @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY |
| 2400 | * |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2401 | * If __dm_suspend returns 0, the device is completely quiescent |
| 2402 | * now. There is no request-processing activity. All new requests |
| 2403 | * are being added to md->deferred list. |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2404 | */ |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2405 | static int __dm_suspend(struct mapped_device *md, struct dm_table *map, |
Bart Van Assche | b48633f | 2016-08-31 15:16:02 -0700 | [diff] [blame] | 2406 | unsigned suspend_flags, long task_state, |
Mike Snitzer | eaf9a73 | 2016-08-02 13:07:20 -0400 | [diff] [blame] | 2407 | int dmf_suspended_flag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2408 | { |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2409 | bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; |
| 2410 | bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; |
| 2411 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2412 | |
Bart Van Assche | 5a8f1f8 | 2016-08-31 15:17:04 -0700 | [diff] [blame] | 2413 | lockdep_assert_held(&md->suspend_lock); |
| 2414 | |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 2415 | /* |
| 2416 | * DMF_NOFLUSH_SUSPENDING must be set before presuspend. |
| 2417 | * This flag is cleared before dm_suspend returns. |
| 2418 | */ |
| 2419 | if (noflush) |
| 2420 | set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
Bart Van Assche | 86331f3 | 2017-04-27 10:11:26 -0700 | [diff] [blame] | 2421 | else |
Mike Snitzer | ac75b09f | 2020-05-14 12:55:39 -0400 | [diff] [blame] | 2422 | DMDEBUG("%s: suspending with flush", dm_device_name(md)); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 2423 | |
Mike Snitzer | d67ee213 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 2424 | /* |
| 2425 | * This gets reverted if there's an error later and the targets |
| 2426 | * provide the .presuspend_undo hook. |
| 2427 | */ |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 2428 | dm_table_presuspend_targets(map); |
| 2429 | |
Mikulas Patocka | 32a926d | 2009-06-22 10:12:17 +0100 | [diff] [blame] | 2430 | /* |
Kiyoshi Ueda | 9f518b2 | 2009-12-10 23:52:16 +0000 | [diff] [blame] | 2431 | * Flush I/O to the device. |
| 2432 | * Any I/O submitted after lock_fs() may not be flushed. |
| 2433 | * noflush takes precedence over do_lockfs. |
| 2434 | * (lock_fs() flushes I/Os and waits for them to complete.) |
Mikulas Patocka | 32a926d | 2009-06-22 10:12:17 +0100 | [diff] [blame] | 2435 | */ |
| 2436 | if (!noflush && do_lockfs) { |
| 2437 | r = lock_fs(md); |
Mike Snitzer | d67ee213 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 2438 | if (r) { |
| 2439 | dm_table_presuspend_undo_targets(map); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2440 | return r; |
Mike Snitzer | d67ee213 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 2441 | } |
Alasdair G Kergon | aa8d7c2 | 2006-01-06 00:20:06 -0800 | [diff] [blame] | 2442 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | |
| 2444 | /* |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2445 | * Here we must make sure that no processes are submitting requests |
| 2446 | * to target drivers i.e. no one may be executing |
Mike Snitzer | 0cede37 | 2020-09-30 15:12:04 -0400 | [diff] [blame] | 2447 | * __split_and_process_bio from dm_submit_bio. |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2448 | * |
Mike Snitzer | 0cede37 | 2020-09-30 15:12:04 -0400 | [diff] [blame] | 2449 | * To get all processes out of __split_and_process_bio in dm_submit_bio, |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2450 | * we take the write lock. To prevent any process from reentering |
Mike Snitzer | 0cede37 | 2020-09-30 15:12:04 -0400 | [diff] [blame] | 2451 | * __split_and_process_bio from dm_submit_bio and quiesce the thread |
| 2452 | * (dm_wq_work), we set DMF_BLOCK_IO_FOR_SUSPEND and call |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 2453 | * flush_workqueue(md->wq). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2454 | */ |
Alasdair G Kergon | 1eb787e | 2009-04-09 00:27:14 +0100 | [diff] [blame] | 2455 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
Hannes Reinecke | 41abc4e | 2014-11-05 14:35:50 +0100 | [diff] [blame] | 2456 | if (map) |
| 2457 | synchronize_srcu(&md->io_barrier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | |
Kiyoshi Ueda | d0bcb87 | 2009-12-10 23:52:18 +0000 | [diff] [blame] | 2459 | /* |
Tejun Heo | 29e4013 | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 2460 | * Stop md->queue before flushing md->wq in case request-based |
| 2461 | * dm defers requests to md->wq from md->queue. |
Kiyoshi Ueda | d0bcb87 | 2009-12-10 23:52:18 +0000 | [diff] [blame] | 2462 | */ |
Jens Axboe | 6a23e05 | 2018-10-10 20:49:26 -0600 | [diff] [blame] | 2463 | if (dm_request_based(md)) |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 2464 | dm_stop_queue(md->queue); |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2465 | |
Kiyoshi Ueda | d0bcb87 | 2009-12-10 23:52:18 +0000 | [diff] [blame] | 2466 | flush_workqueue(md->wq); |
| 2467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | /* |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2469 | * At this point no more requests are entering target request routines. |
| 2470 | * We call dm_wait_for_completion to wait for all existing requests |
| 2471 | * to finish. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2472 | */ |
Bart Van Assche | b48633f | 2016-08-31 15:16:02 -0700 | [diff] [blame] | 2473 | r = dm_wait_for_completion(md, task_state); |
Mike Snitzer | eaf9a73 | 2016-08-02 13:07:20 -0400 | [diff] [blame] | 2474 | if (!r) |
| 2475 | set_bit(dmf_suspended_flag, &md->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | |
Milan Broz | 6d6f10d | 2008-02-08 02:10:22 +0000 | [diff] [blame] | 2477 | if (noflush) |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 2478 | clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
Hannes Reinecke | 41abc4e | 2014-11-05 14:35:50 +0100 | [diff] [blame] | 2479 | if (map) |
| 2480 | synchronize_srcu(&md->io_barrier); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 2481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | /* were we interrupted ? */ |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2483 | if (r < 0) { |
Mikulas Patocka | 9a1fb46 | 2009-04-02 19:55:36 +0100 | [diff] [blame] | 2484 | dm_queue_flush(md); |
Milan Broz | 73d410c | 2008-02-08 02:10:25 +0000 | [diff] [blame] | 2485 | |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2486 | if (dm_request_based(md)) |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 2487 | dm_start_queue(md->queue); |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2488 | |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2489 | unlock_fs(md); |
Mike Snitzer | d67ee213 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 2490 | dm_table_presuspend_undo_targets(map); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2491 | /* pushback list is already flushed, so skip flush */ |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2492 | } |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2493 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2494 | return r; |
| 2495 | } |
| 2496 | |
| 2497 | /* |
| 2498 | * We need to be able to change a mapping table under a mounted |
| 2499 | * filesystem. For example we might want to move some data in |
| 2500 | * the background. Before the table can be swapped with |
| 2501 | * dm_bind_table, dm_suspend must be called to flush any in |
| 2502 | * flight bios and ensure that any further io gets deferred. |
| 2503 | */ |
| 2504 | /* |
| 2505 | * Suspend mechanism in request-based dm. |
| 2506 | * |
| 2507 | * 1. Flush all I/Os by lock_fs() if needed. |
| 2508 | * 2. Stop dispatching any I/O by stopping the request_queue. |
| 2509 | * 3. Wait for all in-flight I/Os to be completed or requeued. |
| 2510 | * |
| 2511 | * To abort suspend, start the request_queue. |
| 2512 | */ |
| 2513 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags) |
| 2514 | { |
| 2515 | struct dm_table *map = NULL; |
| 2516 | int r = 0; |
| 2517 | |
| 2518 | retry: |
| 2519 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
| 2520 | |
| 2521 | if (dm_suspended_md(md)) { |
| 2522 | r = -EINVAL; |
| 2523 | goto out_unlock; |
| 2524 | } |
| 2525 | |
| 2526 | if (dm_suspended_internally_md(md)) { |
| 2527 | /* already internally suspended, wait for internal resume */ |
| 2528 | mutex_unlock(&md->suspend_lock); |
| 2529 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); |
| 2530 | if (r) |
| 2531 | return r; |
| 2532 | goto retry; |
| 2533 | } |
| 2534 | |
Eric Dumazet | a12f5d4 | 2014-11-23 09:34:29 -0800 | [diff] [blame] | 2535 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2536 | |
Mike Snitzer | eaf9a73 | 2016-08-02 13:07:20 -0400 | [diff] [blame] | 2537 | r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2538 | if (r) |
| 2539 | goto out_unlock; |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2540 | |
Mikulas Patocka | 5df96f2 | 2020-07-23 10:42:09 -0400 | [diff] [blame] | 2541 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
Kiyoshi Ueda | 4d4471c | 2009-12-10 23:52:26 +0000 | [diff] [blame] | 2542 | dm_table_postsuspend_targets(map); |
Mikulas Patocka | 5df96f2 | 2020-07-23 10:42:09 -0400 | [diff] [blame] | 2543 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
Kiyoshi Ueda | 4d4471c | 2009-12-10 23:52:26 +0000 | [diff] [blame] | 2544 | |
Alasdair G Kergon | d287483 | 2006-11-08 17:44:43 -0800 | [diff] [blame] | 2545 | out_unlock: |
Daniel Walker | e61290a | 2008-02-08 02:10:08 +0000 | [diff] [blame] | 2546 | mutex_unlock(&md->suspend_lock); |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 2547 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2548 | } |
| 2549 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2550 | static int __dm_resume(struct mapped_device *md, struct dm_table *map) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | { |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2552 | if (map) { |
| 2553 | int r = dm_table_resume_targets(map); |
| 2554 | if (r) |
| 2555 | return r; |
| 2556 | } |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2557 | |
Mikulas Patocka | 9a1fb46 | 2009-04-02 19:55:36 +0100 | [diff] [blame] | 2558 | dm_queue_flush(md); |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2559 | |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2560 | /* |
| 2561 | * Flushing deferred I/Os must be done after targets are resumed |
| 2562 | * so that mapping of targets can work correctly. |
| 2563 | * Request-based dm is queueing the deferred I/Os in its request_queue. |
| 2564 | */ |
| 2565 | if (dm_request_based(md)) |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 2566 | dm_start_queue(md->queue); |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2567 | |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2568 | unlock_fs(md); |
| 2569 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2570 | return 0; |
| 2571 | } |
| 2572 | |
| 2573 | int dm_resume(struct mapped_device *md) |
| 2574 | { |
Minfei Huang | 8dc2365 | 2016-09-06 16:00:29 +0800 | [diff] [blame] | 2575 | int r; |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2576 | struct dm_table *map = NULL; |
| 2577 | |
| 2578 | retry: |
Minfei Huang | 8dc2365 | 2016-09-06 16:00:29 +0800 | [diff] [blame] | 2579 | r = -EINVAL; |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2580 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
| 2581 | |
| 2582 | if (!dm_suspended_md(md)) |
| 2583 | goto out; |
| 2584 | |
| 2585 | if (dm_suspended_internally_md(md)) { |
| 2586 | /* already internally suspended, wait for internal resume */ |
| 2587 | mutex_unlock(&md->suspend_lock); |
| 2588 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); |
| 2589 | if (r) |
| 2590 | return r; |
| 2591 | goto retry; |
| 2592 | } |
| 2593 | |
Eric Dumazet | a12f5d4 | 2014-11-23 09:34:29 -0800 | [diff] [blame] | 2594 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2595 | if (!map || !dm_table_get_size(map)) |
| 2596 | goto out; |
| 2597 | |
| 2598 | r = __dm_resume(md, map); |
| 2599 | if (r) |
| 2600 | goto out; |
| 2601 | |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2602 | clear_bit(DMF_SUSPENDED, &md->flags); |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 2603 | out: |
Daniel Walker | e61290a | 2008-02-08 02:10:08 +0000 | [diff] [blame] | 2604 | mutex_unlock(&md->suspend_lock); |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2605 | |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 2606 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2607 | } |
| 2608 | |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2609 | /* |
| 2610 | * Internal suspend/resume works like userspace-driven suspend. It waits |
| 2611 | * until all bios finish and prevents issuing new bios to the target drivers. |
| 2612 | * It may be used only from the kernel. |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2613 | */ |
| 2614 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2615 | static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags) |
| 2616 | { |
| 2617 | struct dm_table *map = NULL; |
| 2618 | |
Bart Van Assche | 1ea0654e | 2017-04-27 10:11:21 -0700 | [diff] [blame] | 2619 | lockdep_assert_held(&md->suspend_lock); |
| 2620 | |
Mikulas Patocka | 96b26c8 | 2015-01-08 18:52:26 -0500 | [diff] [blame] | 2621 | if (md->internal_suspend_count++) |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2622 | return; /* nested internal suspend */ |
| 2623 | |
| 2624 | if (dm_suspended_md(md)) { |
| 2625 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); |
| 2626 | return; /* nest suspend */ |
| 2627 | } |
| 2628 | |
Eric Dumazet | a12f5d4 | 2014-11-23 09:34:29 -0800 | [diff] [blame] | 2629 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2630 | |
| 2631 | /* |
| 2632 | * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is |
| 2633 | * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend |
| 2634 | * would require changing .presuspend to return an error -- avoid this |
| 2635 | * until there is a need for more elaborate variants of internal suspend. |
| 2636 | */ |
Mike Snitzer | eaf9a73 | 2016-08-02 13:07:20 -0400 | [diff] [blame] | 2637 | (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE, |
| 2638 | DMF_SUSPENDED_INTERNALLY); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2639 | |
Mikulas Patocka | 5df96f2 | 2020-07-23 10:42:09 -0400 | [diff] [blame] | 2640 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2641 | dm_table_postsuspend_targets(map); |
Mikulas Patocka | 5df96f2 | 2020-07-23 10:42:09 -0400 | [diff] [blame] | 2642 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2643 | } |
| 2644 | |
| 2645 | static void __dm_internal_resume(struct mapped_device *md) |
| 2646 | { |
Mikulas Patocka | 96b26c8 | 2015-01-08 18:52:26 -0500 | [diff] [blame] | 2647 | BUG_ON(!md->internal_suspend_count); |
| 2648 | |
| 2649 | if (--md->internal_suspend_count) |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2650 | return; /* resume from nested internal suspend */ |
| 2651 | |
| 2652 | if (dm_suspended_md(md)) |
| 2653 | goto done; /* resume from nested suspend */ |
| 2654 | |
| 2655 | /* |
| 2656 | * NOTE: existing callers don't need to call dm_table_resume_targets |
| 2657 | * (which may fail -- so best to avoid it for now by passing NULL map) |
| 2658 | */ |
| 2659 | (void) __dm_resume(md, NULL); |
| 2660 | |
| 2661 | done: |
| 2662 | clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); |
| 2663 | smp_mb__after_atomic(); |
| 2664 | wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); |
| 2665 | } |
| 2666 | |
| 2667 | void dm_internal_suspend_noflush(struct mapped_device *md) |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2668 | { |
| 2669 | mutex_lock(&md->suspend_lock); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2670 | __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); |
| 2671 | mutex_unlock(&md->suspend_lock); |
| 2672 | } |
| 2673 | EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); |
| 2674 | |
| 2675 | void dm_internal_resume(struct mapped_device *md) |
| 2676 | { |
| 2677 | mutex_lock(&md->suspend_lock); |
| 2678 | __dm_internal_resume(md); |
| 2679 | mutex_unlock(&md->suspend_lock); |
| 2680 | } |
| 2681 | EXPORT_SYMBOL_GPL(dm_internal_resume); |
| 2682 | |
| 2683 | /* |
| 2684 | * Fast variants of internal suspend/resume hold md->suspend_lock, |
| 2685 | * which prevents interaction with userspace-driven suspend. |
| 2686 | */ |
| 2687 | |
| 2688 | void dm_internal_suspend_fast(struct mapped_device *md) |
| 2689 | { |
| 2690 | mutex_lock(&md->suspend_lock); |
| 2691 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2692 | return; |
| 2693 | |
| 2694 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
| 2695 | synchronize_srcu(&md->io_barrier); |
| 2696 | flush_workqueue(md->wq); |
| 2697 | dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); |
| 2698 | } |
Mikulas Patocka | b735fed | 2015-02-26 11:40:35 -0500 | [diff] [blame] | 2699 | EXPORT_SYMBOL_GPL(dm_internal_suspend_fast); |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2700 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2701 | void dm_internal_resume_fast(struct mapped_device *md) |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2702 | { |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2703 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2704 | goto done; |
| 2705 | |
| 2706 | dm_queue_flush(md); |
| 2707 | |
| 2708 | done: |
| 2709 | mutex_unlock(&md->suspend_lock); |
| 2710 | } |
Mikulas Patocka | b735fed | 2015-02-26 11:40:35 -0500 | [diff] [blame] | 2711 | EXPORT_SYMBOL_GPL(dm_internal_resume_fast); |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2712 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2713 | /*----------------------------------------------------------------- |
| 2714 | * Event notification. |
| 2715 | *---------------------------------------------------------------*/ |
Peter Rajnoha | 3abf85b | 2010-03-06 02:32:31 +0000 | [diff] [blame] | 2716 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 2717 | unsigned cookie) |
Alasdair G Kergon | 69267a3 | 2007-12-13 14:15:57 +0000 | [diff] [blame] | 2718 | { |
Mikulas Patocka | 6958c1c | 2020-07-08 12:25:20 -0400 | [diff] [blame] | 2719 | int r; |
| 2720 | unsigned noio_flag; |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 2721 | char udev_cookie[DM_COOKIE_LENGTH]; |
| 2722 | char *envp[] = { udev_cookie, NULL }; |
| 2723 | |
Mikulas Patocka | 6958c1c | 2020-07-08 12:25:20 -0400 | [diff] [blame] | 2724 | noio_flag = memalloc_noio_save(); |
| 2725 | |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 2726 | if (!cookie) |
Mikulas Patocka | 6958c1c | 2020-07-08 12:25:20 -0400 | [diff] [blame] | 2727 | r = kobject_uevent(&disk_to_dev(md->disk)->kobj, action); |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 2728 | else { |
| 2729 | snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u", |
| 2730 | DM_COOKIE_ENV_VAR_NAME, cookie); |
Mikulas Patocka | 6958c1c | 2020-07-08 12:25:20 -0400 | [diff] [blame] | 2731 | r = kobject_uevent_env(&disk_to_dev(md->disk)->kobj, |
| 2732 | action, envp); |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 2733 | } |
Mikulas Patocka | 6958c1c | 2020-07-08 12:25:20 -0400 | [diff] [blame] | 2734 | |
| 2735 | memalloc_noio_restore(noio_flag); |
| 2736 | |
| 2737 | return r; |
Alasdair G Kergon | 69267a3 | 2007-12-13 14:15:57 +0000 | [diff] [blame] | 2738 | } |
| 2739 | |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 2740 | uint32_t dm_next_uevent_seq(struct mapped_device *md) |
| 2741 | { |
| 2742 | return atomic_add_return(1, &md->uevent_seq); |
| 2743 | } |
| 2744 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2745 | uint32_t dm_get_event_nr(struct mapped_device *md) |
| 2746 | { |
| 2747 | return atomic_read(&md->event_nr); |
| 2748 | } |
| 2749 | |
| 2750 | int dm_wait_event(struct mapped_device *md, int event_nr) |
| 2751 | { |
| 2752 | return wait_event_interruptible(md->eventq, |
| 2753 | (event_nr != atomic_read(&md->event_nr))); |
| 2754 | } |
| 2755 | |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 2756 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist) |
| 2757 | { |
| 2758 | unsigned long flags; |
| 2759 | |
| 2760 | spin_lock_irqsave(&md->uevent_lock, flags); |
| 2761 | list_add(elist, &md->uevent_list); |
| 2762 | spin_unlock_irqrestore(&md->uevent_lock, flags); |
| 2763 | } |
| 2764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2765 | /* |
| 2766 | * The gendisk is only valid as long as you have a reference |
| 2767 | * count on 'md'. |
| 2768 | */ |
| 2769 | struct gendisk *dm_disk(struct mapped_device *md) |
| 2770 | { |
| 2771 | return md->disk; |
| 2772 | } |
Sami Tolvanen | 65ff5b7 | 2015-03-18 15:52:14 +0000 | [diff] [blame] | 2773 | EXPORT_SYMBOL_GPL(dm_disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2774 | |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2775 | struct kobject *dm_kobject(struct mapped_device *md) |
| 2776 | { |
Mikulas Patocka | 2995fa7 | 2014-01-13 19:37:54 -0500 | [diff] [blame] | 2777 | return &md->kobj_holder.kobj; |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2778 | } |
| 2779 | |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2780 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj) |
| 2781 | { |
| 2782 | struct mapped_device *md; |
| 2783 | |
Mikulas Patocka | 2995fa7 | 2014-01-13 19:37:54 -0500 | [diff] [blame] | 2784 | md = container_of(kobj, struct mapped_device, kobj_holder.kobj); |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2785 | |
Hou Tao | b9a41d2 | 2017-11-01 15:42:36 +0800 | [diff] [blame] | 2786 | spin_lock(&_minor_lock); |
| 2787 | if (test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { |
| 2788 | md = NULL; |
| 2789 | goto out; |
| 2790 | } |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2791 | dm_get(md); |
Hou Tao | b9a41d2 | 2017-11-01 15:42:36 +0800 | [diff] [blame] | 2792 | out: |
| 2793 | spin_unlock(&_minor_lock); |
| 2794 | |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2795 | return md; |
| 2796 | } |
| 2797 | |
Kiyoshi Ueda | 4f186f8 | 2009-12-10 23:52:26 +0000 | [diff] [blame] | 2798 | int dm_suspended_md(struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2799 | { |
| 2800 | return test_bit(DMF_SUSPENDED, &md->flags); |
| 2801 | } |
| 2802 | |
Mikulas Patocka | 5df96f2 | 2020-07-23 10:42:09 -0400 | [diff] [blame] | 2803 | static int dm_post_suspending_md(struct mapped_device *md) |
| 2804 | { |
| 2805 | return test_bit(DMF_POST_SUSPENDING, &md->flags); |
| 2806 | } |
| 2807 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2808 | int dm_suspended_internally_md(struct mapped_device *md) |
| 2809 | { |
| 2810 | return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); |
| 2811 | } |
| 2812 | |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 2813 | int dm_test_deferred_remove_flag(struct mapped_device *md) |
| 2814 | { |
| 2815 | return test_bit(DMF_DEFERRED_REMOVE, &md->flags); |
| 2816 | } |
| 2817 | |
Kiyoshi Ueda | 64dbce5 | 2009-12-10 23:52:27 +0000 | [diff] [blame] | 2818 | int dm_suspended(struct dm_target *ti) |
| 2819 | { |
Mike Snitzer | 33bd6f0 | 2020-09-19 13:09:11 -0400 | [diff] [blame] | 2820 | return dm_suspended_md(ti->table->md); |
Kiyoshi Ueda | 64dbce5 | 2009-12-10 23:52:27 +0000 | [diff] [blame] | 2821 | } |
| 2822 | EXPORT_SYMBOL_GPL(dm_suspended); |
| 2823 | |
Mikulas Patocka | 5df96f2 | 2020-07-23 10:42:09 -0400 | [diff] [blame] | 2824 | int dm_post_suspending(struct dm_target *ti) |
| 2825 | { |
Mike Snitzer | 33bd6f0 | 2020-09-19 13:09:11 -0400 | [diff] [blame] | 2826 | return dm_post_suspending_md(ti->table->md); |
Mikulas Patocka | 5df96f2 | 2020-07-23 10:42:09 -0400 | [diff] [blame] | 2827 | } |
| 2828 | EXPORT_SYMBOL_GPL(dm_post_suspending); |
| 2829 | |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 2830 | int dm_noflush_suspending(struct dm_target *ti) |
| 2831 | { |
Mike Snitzer | 33bd6f0 | 2020-09-19 13:09:11 -0400 | [diff] [blame] | 2832 | return __noflush_suspending(ti->table->md); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 2833 | } |
| 2834 | EXPORT_SYMBOL_GPL(dm_noflush_suspending); |
| 2835 | |
Bart Van Assche | 7e0d574 | 2017-04-27 10:11:23 -0700 | [diff] [blame] | 2836 | struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type, |
Mike Snitzer | 0776aa0 | 2017-12-08 14:40:52 -0500 | [diff] [blame] | 2837 | unsigned integrity, unsigned per_io_data_size, |
| 2838 | unsigned min_pool_size) |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2839 | { |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 2840 | struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id); |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2841 | unsigned int pool_size = 0; |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 2842 | unsigned int front_pad, io_front_pad; |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 2843 | int ret; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2844 | |
| 2845 | if (!pools) |
Mike Snitzer | 4e6e36c | 2015-06-26 09:42:57 -0400 | [diff] [blame] | 2846 | return NULL; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2847 | |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2848 | switch (type) { |
| 2849 | case DM_TYPE_BIO_BASED: |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 2850 | case DM_TYPE_DAX_BIO_BASED: |
Mike Snitzer | 0776aa0 | 2017-12-08 14:40:52 -0500 | [diff] [blame] | 2851 | pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size); |
Mike Snitzer | 30187e1 | 2016-01-31 13:28:26 -0500 | [diff] [blame] | 2852 | front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone); |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 2853 | io_front_pad = roundup(front_pad, __alignof__(struct dm_io)) + offsetof(struct dm_io, tio); |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 2854 | ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, 0); |
| 2855 | if (ret) |
Mike Snitzer | 64f52b0 | 2017-12-11 23:17:47 -0500 | [diff] [blame] | 2856 | goto out; |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 2857 | if (integrity && bioset_integrity_create(&pools->io_bs, pool_size)) |
Christoph Hellwig | eb8db83 | 2017-01-22 18:32:46 +0100 | [diff] [blame] | 2858 | goto out; |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2859 | break; |
| 2860 | case DM_TYPE_REQUEST_BASED: |
Mike Snitzer | 0776aa0 | 2017-12-08 14:40:52 -0500 | [diff] [blame] | 2861 | pool_size = max(dm_get_reserved_rq_based_ios(), min_pool_size); |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2862 | front_pad = offsetof(struct dm_rq_clone_bio_info, clone); |
Mike Snitzer | 591ddcfc | 2016-01-31 12:05:42 -0500 | [diff] [blame] | 2863 | /* per_io_data_size is used for blk-mq pdu at queue allocation */ |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2864 | break; |
| 2865 | default: |
| 2866 | BUG(); |
| 2867 | } |
| 2868 | |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 2869 | ret = bioset_init(&pools->bs, pool_size, front_pad, 0); |
| 2870 | if (ret) |
Jun'ichi Nomura | 5f01520 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2871 | goto out; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2872 | |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 2873 | if (integrity && bioset_integrity_create(&pools->bs, pool_size)) |
Jun'ichi Nomura | 5f01520 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2874 | goto out; |
Martin K. Petersen | a91a278 | 2011-03-17 11:11:05 +0100 | [diff] [blame] | 2875 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2876 | return pools; |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2877 | |
Jun'ichi Nomura | 5f01520 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2878 | out: |
| 2879 | dm_free_md_mempools(pools); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2880 | |
Mike Snitzer | 4e6e36c | 2015-06-26 09:42:57 -0400 | [diff] [blame] | 2881 | return NULL; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2882 | } |
| 2883 | |
| 2884 | void dm_free_md_mempools(struct dm_md_mempools *pools) |
| 2885 | { |
| 2886 | if (!pools) |
| 2887 | return; |
| 2888 | |
Kent Overstreet | 6f1c819 | 2018-05-20 18:25:53 -0400 | [diff] [blame] | 2889 | bioset_exit(&pools->bs); |
| 2890 | bioset_exit(&pools->io_bs); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2891 | |
| 2892 | kfree(pools); |
| 2893 | } |
| 2894 | |
Christoph Hellwig | 9c72bad | 2016-07-08 21:23:51 +0900 | [diff] [blame] | 2895 | struct dm_pr { |
| 2896 | u64 old_key; |
| 2897 | u64 new_key; |
| 2898 | u32 flags; |
| 2899 | bool fail_early; |
| 2900 | }; |
| 2901 | |
| 2902 | static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn, |
| 2903 | void *data) |
| 2904 | { |
| 2905 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 2906 | struct dm_table *table; |
| 2907 | struct dm_target *ti; |
| 2908 | int ret = -ENOTTY, srcu_idx; |
| 2909 | |
| 2910 | table = dm_get_live_table(md, &srcu_idx); |
| 2911 | if (!table || !dm_table_get_size(table)) |
| 2912 | goto out; |
| 2913 | |
| 2914 | /* We only support devices that have a single target */ |
| 2915 | if (dm_table_get_num_targets(table) != 1) |
| 2916 | goto out; |
| 2917 | ti = dm_table_get_target(table, 0); |
| 2918 | |
| 2919 | ret = -EINVAL; |
| 2920 | if (!ti->type->iterate_devices) |
| 2921 | goto out; |
| 2922 | |
| 2923 | ret = ti->type->iterate_devices(ti, fn, data); |
| 2924 | out: |
| 2925 | dm_put_live_table(md, srcu_idx); |
| 2926 | return ret; |
| 2927 | } |
| 2928 | |
| 2929 | /* |
| 2930 | * For register / unregister we need to manually call out to every path. |
| 2931 | */ |
| 2932 | static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev, |
| 2933 | sector_t start, sector_t len, void *data) |
| 2934 | { |
| 2935 | struct dm_pr *pr = data; |
| 2936 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; |
| 2937 | |
| 2938 | if (!ops || !ops->pr_register) |
| 2939 | return -EOPNOTSUPP; |
| 2940 | return ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); |
| 2941 | } |
| 2942 | |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2943 | static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2944 | u32 flags) |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2945 | { |
Christoph Hellwig | 9c72bad | 2016-07-08 21:23:51 +0900 | [diff] [blame] | 2946 | struct dm_pr pr = { |
| 2947 | .old_key = old_key, |
| 2948 | .new_key = new_key, |
| 2949 | .flags = flags, |
| 2950 | .fail_early = true, |
| 2951 | }; |
| 2952 | int ret; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2953 | |
Christoph Hellwig | 9c72bad | 2016-07-08 21:23:51 +0900 | [diff] [blame] | 2954 | ret = dm_call_pr(bdev, __dm_pr_register, &pr); |
| 2955 | if (ret && new_key) { |
| 2956 | /* unregister all paths if we failed to register any path */ |
| 2957 | pr.old_key = new_key; |
| 2958 | pr.new_key = 0; |
| 2959 | pr.flags = 0; |
| 2960 | pr.fail_early = false; |
| 2961 | dm_call_pr(bdev, __dm_pr_register, &pr); |
| 2962 | } |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2963 | |
Christoph Hellwig | 9c72bad | 2016-07-08 21:23:51 +0900 | [diff] [blame] | 2964 | return ret; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2965 | } |
| 2966 | |
| 2967 | static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2968 | u32 flags) |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2969 | { |
| 2970 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 2971 | const struct pr_ops *ops; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 2972 | int r, srcu_idx; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2973 | |
Mike Snitzer | 5bd5e8d | 2018-04-03 16:54:10 -0400 | [diff] [blame] | 2974 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2975 | if (r < 0) |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 2976 | goto out; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2977 | |
| 2978 | ops = bdev->bd_disk->fops->pr_ops; |
| 2979 | if (ops && ops->pr_reserve) |
| 2980 | r = ops->pr_reserve(bdev, key, type, flags); |
| 2981 | else |
| 2982 | r = -EOPNOTSUPP; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 2983 | out: |
| 2984 | dm_unprepare_ioctl(md, srcu_idx); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2985 | return r; |
| 2986 | } |
| 2987 | |
| 2988 | static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type) |
| 2989 | { |
| 2990 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 2991 | const struct pr_ops *ops; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 2992 | int r, srcu_idx; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2993 | |
Mike Snitzer | 5bd5e8d | 2018-04-03 16:54:10 -0400 | [diff] [blame] | 2994 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2995 | if (r < 0) |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 2996 | goto out; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2997 | |
| 2998 | ops = bdev->bd_disk->fops->pr_ops; |
| 2999 | if (ops && ops->pr_release) |
| 3000 | r = ops->pr_release(bdev, key, type); |
| 3001 | else |
| 3002 | r = -EOPNOTSUPP; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 3003 | out: |
| 3004 | dm_unprepare_ioctl(md, srcu_idx); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3005 | return r; |
| 3006 | } |
| 3007 | |
| 3008 | static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 3009 | enum pr_type type, bool abort) |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3010 | { |
| 3011 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 3012 | const struct pr_ops *ops; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 3013 | int r, srcu_idx; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3014 | |
Mike Snitzer | 5bd5e8d | 2018-04-03 16:54:10 -0400 | [diff] [blame] | 3015 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3016 | if (r < 0) |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 3017 | goto out; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3018 | |
| 3019 | ops = bdev->bd_disk->fops->pr_ops; |
| 3020 | if (ops && ops->pr_preempt) |
| 3021 | r = ops->pr_preempt(bdev, old_key, new_key, type, abort); |
| 3022 | else |
| 3023 | r = -EOPNOTSUPP; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 3024 | out: |
| 3025 | dm_unprepare_ioctl(md, srcu_idx); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3026 | return r; |
| 3027 | } |
| 3028 | |
| 3029 | static int dm_pr_clear(struct block_device *bdev, u64 key) |
| 3030 | { |
| 3031 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 3032 | const struct pr_ops *ops; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 3033 | int r, srcu_idx; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3034 | |
Mike Snitzer | 5bd5e8d | 2018-04-03 16:54:10 -0400 | [diff] [blame] | 3035 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3036 | if (r < 0) |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 3037 | goto out; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3038 | |
| 3039 | ops = bdev->bd_disk->fops->pr_ops; |
| 3040 | if (ops && ops->pr_clear) |
| 3041 | r = ops->pr_clear(bdev, key); |
| 3042 | else |
| 3043 | r = -EOPNOTSUPP; |
Mike Snitzer | 971888c | 2018-04-03 15:05:12 -0400 | [diff] [blame] | 3044 | out: |
| 3045 | dm_unprepare_ioctl(md, srcu_idx); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3046 | return r; |
| 3047 | } |
| 3048 | |
| 3049 | static const struct pr_ops dm_pr_ops = { |
| 3050 | .pr_register = dm_pr_register, |
| 3051 | .pr_reserve = dm_pr_reserve, |
| 3052 | .pr_release = dm_pr_release, |
| 3053 | .pr_preempt = dm_pr_preempt, |
| 3054 | .pr_clear = dm_pr_clear, |
| 3055 | }; |
| 3056 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 3057 | static const struct block_device_operations dm_blk_dops = { |
Christoph Hellwig | c62b37d | 2020-07-01 10:59:43 +0200 | [diff] [blame] | 3058 | .submit_bio = dm_submit_bio, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3059 | .open = dm_blk_open, |
| 3060 | .release = dm_blk_close, |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 3061 | .ioctl = dm_blk_ioctl, |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 3062 | .getgeo = dm_blk_getgeo, |
Christoph Hellwig | e76239a | 2018-10-12 19:08:49 +0900 | [diff] [blame] | 3063 | .report_zones = dm_blk_report_zones, |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 3064 | .pr_ops = &dm_pr_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3065 | .owner = THIS_MODULE |
| 3066 | }; |
| 3067 | |
Mike Snitzer | 681cc5e | 2020-10-07 16:41:01 -0400 | [diff] [blame] | 3068 | static const struct block_device_operations dm_rq_blk_dops = { |
| 3069 | .open = dm_blk_open, |
| 3070 | .release = dm_blk_close, |
| 3071 | .ioctl = dm_blk_ioctl, |
| 3072 | .getgeo = dm_blk_getgeo, |
| 3073 | .pr_ops = &dm_pr_ops, |
| 3074 | .owner = THIS_MODULE |
| 3075 | }; |
| 3076 | |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 3077 | static const struct dax_operations dm_dax_ops = { |
| 3078 | .direct_access = dm_dax_direct_access, |
Dan Williams | 7bf7eac | 2019-05-16 13:26:29 -0700 | [diff] [blame] | 3079 | .dax_supported = dm_dax_supported, |
Dan Williams | 7e026c8 | 2017-05-29 12:57:56 -0700 | [diff] [blame] | 3080 | .copy_from_iter = dm_dax_copy_from_iter, |
Dan Williams | b3a9a0c | 2018-05-02 06:46:33 -0700 | [diff] [blame] | 3081 | .copy_to_iter = dm_dax_copy_to_iter, |
Vivek Goyal | cdf6cdc | 2020-02-28 11:34:54 -0500 | [diff] [blame] | 3082 | .zero_page_range = dm_dax_zero_page_range, |
Dan Williams | f26c571 | 2017-04-12 12:35:44 -0700 | [diff] [blame] | 3083 | }; |
| 3084 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3085 | /* |
| 3086 | * module hooks |
| 3087 | */ |
| 3088 | module_init(dm_init); |
| 3089 | module_exit(dm_exit); |
| 3090 | |
| 3091 | module_param(major, uint, 0); |
| 3092 | MODULE_PARM_DESC(major, "The major number of the device mapper"); |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 3093 | |
Mike Snitzer | e860313 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 3094 | module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR); |
| 3095 | MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); |
| 3096 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 3097 | module_param(dm_numa_node, int, S_IRUGO | S_IWUSR); |
| 3098 | MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations"); |
| 3099 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3100 | MODULE_DESCRIPTION(DM_NAME " driver"); |
| 3101 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); |
| 3102 | MODULE_LICENSE("GPL"); |