Christoph Hellwig | 3dcf60bc | 2019-04-30 14:42:43 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * gendisk handling |
Christoph Hellwig | 7b51e70 | 2020-12-10 08:55:44 +0100 | [diff] [blame] | 4 | * |
| 5 | * Portions Copyright (C) 2020 Christoph Hellwig |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | */ |
| 7 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <linux/module.h> |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 9 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/fs.h> |
Andrew Morton | b446b60 | 2007-02-20 13:57:48 -0800 | [diff] [blame] | 11 | #include <linux/kdev_t.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/kernel.h> |
| 13 | #include <linux/blkdev.h> |
Tejun Heo | 66114ca | 2015-05-22 17:13:32 -0400 | [diff] [blame] | 14 | #include <linux/backing-dev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/init.h> |
| 16 | #include <linux/spinlock.h> |
Alexey Dobriyan | f500975 | 2008-10-04 23:53:21 +0400 | [diff] [blame] | 17 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/seq_file.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/kmod.h> |
Christoph Hellwig | b81e0c2 | 2021-09-20 14:33:25 +0200 | [diff] [blame] | 21 | #include <linux/major.h> |
Jes Sorensen | 58383af | 2006-02-06 14:12:43 -0800 | [diff] [blame] | 22 | #include <linux/mutex.h> |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 23 | #include <linux/idr.h> |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 24 | #include <linux/log2.h> |
Ming Lei | 25e823c | 2013-02-22 16:34:13 -0800 | [diff] [blame] | 25 | #include <linux/pm_runtime.h> |
Vishal Verma | 99e6608 | 2016-01-09 08:36:51 -0800 | [diff] [blame] | 26 | #include <linux/badblocks.h> |
Christoph Hellwig | 82d981d | 2021-11-23 19:53:12 +0100 | [diff] [blame] | 27 | #include <linux/part_stat.h> |
Yu Kuai | dd7de37 | 2023-06-10 10:20:03 +0800 | [diff] [blame] | 28 | #include <linux/blktrace_api.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Yu Kuai | dd7de37 | 2023-06-10 10:20:03 +0800 | [diff] [blame] | 30 | #include "blk-throttle.h" |
Adrian Bunk | ff88972 | 2008-03-04 11:23:45 +0100 | [diff] [blame] | 31 | #include "blk.h" |
Christoph Hellwig | 2aa7745 | 2021-11-23 19:53:08 +0100 | [diff] [blame] | 32 | #include "blk-mq-sched.h" |
Christoph Hellwig | 8e141f9 | 2021-09-29 09:12:40 +0200 | [diff] [blame] | 33 | #include "blk-rq-qos.h" |
Ming Lei | 1059699 | 2022-03-08 06:51:55 +0100 | [diff] [blame] | 34 | #include "blk-cgroup.h" |
Adrian Bunk | ff88972 | 2008-03-04 11:23:45 +0100 | [diff] [blame] | 35 | |
Christoph Hellwig | 31eb618 | 2020-03-25 16:48:35 +0100 | [diff] [blame] | 36 | static struct kobject *block_depr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Matteo Croce | cf17994 | 2021-07-13 01:05:25 +0200 | [diff] [blame] | 38 | /* |
| 39 | * Unique, monotonically increasing sequential number associated with block |
| 40 | * devices instances (i.e. incremented each time a device is attached). |
| 41 | * Associating uevents with block devices in userspace is difficult and racy: |
| 42 | * the uevent netlink socket is lossy, and on slow and overloaded systems has |
| 43 | * a very high latency. |
| 44 | * Block devices do not have exclusive owners in userspace, any process can set |
| 45 | * one up (e.g. loop devices). Moreover, device names can be reused (e.g. loop0 |
| 46 | * can be reused again and again). |
| 47 | * A userspace process setting up a block device and watching for its events |
| 48 | * cannot thus reliably tell whether an event relates to the device it just set |
| 49 | * up or another earlier instance with the same name. |
| 50 | * This sequential number allows userspace processes to solve this problem, and |
| 51 | * uniquely associate an uevent to the lifetime to a device. |
| 52 | */ |
| 53 | static atomic64_t diskseq; |
| 54 | |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 55 | /* for extended dynamic devt allocation, currently only one major is used */ |
Tejun Heo | ce23bba | 2013-02-27 17:03:56 -0800 | [diff] [blame] | 56 | #define NR_EXT_DEVT (1 << MINORBITS) |
Christoph Hellwig | 22ae8ce | 2020-11-26 09:23:26 +0100 | [diff] [blame] | 57 | static DEFINE_IDA(ext_devt_ida); |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 58 | |
Christoph Hellwig | a782483 | 2020-11-26 18:43:37 +0100 | [diff] [blame] | 59 | void set_capacity(struct gendisk *disk, sector_t sectors) |
| 60 | { |
Damien Le Moal | 8379436 | 2023-04-24 22:13:18 +0900 | [diff] [blame] | 61 | bdev_set_nr_sectors(disk->part0, sectors); |
Christoph Hellwig | a782483 | 2020-11-26 18:43:37 +0100 | [diff] [blame] | 62 | } |
| 63 | EXPORT_SYMBOL(set_capacity); |
| 64 | |
Balbir Singh | e598a72 | 2020-03-13 05:30:05 +0000 | [diff] [blame] | 65 | /* |
Christoph Hellwig | 449f4ec | 2020-11-16 15:56:56 +0100 | [diff] [blame] | 66 | * Set disk capacity and notify if the size is not currently zero and will not |
| 67 | * be set to zero. Returns true if a uevent was sent, otherwise false. |
Balbir Singh | e598a72 | 2020-03-13 05:30:05 +0000 | [diff] [blame] | 68 | */ |
Christoph Hellwig | 449f4ec | 2020-11-16 15:56:56 +0100 | [diff] [blame] | 69 | bool set_capacity_and_notify(struct gendisk *disk, sector_t size) |
Balbir Singh | e598a72 | 2020-03-13 05:30:05 +0000 | [diff] [blame] | 70 | { |
| 71 | sector_t capacity = get_capacity(disk); |
Christoph Hellwig | a782483 | 2020-11-26 18:43:37 +0100 | [diff] [blame] | 72 | char *envp[] = { "RESIZE=1", NULL }; |
Balbir Singh | e598a72 | 2020-03-13 05:30:05 +0000 | [diff] [blame] | 73 | |
| 74 | set_capacity(disk, size); |
Balbir Singh | e598a72 | 2020-03-13 05:30:05 +0000 | [diff] [blame] | 75 | |
Christoph Hellwig | a782483 | 2020-11-26 18:43:37 +0100 | [diff] [blame] | 76 | /* |
| 77 | * Only print a message and send a uevent if the gendisk is user visible |
| 78 | * and alive. This avoids spamming the log and udev when setting the |
| 79 | * initial capacity during probing. |
| 80 | */ |
| 81 | if (size == capacity || |
Christoph Hellwig | 50b4aec | 2021-08-09 08:40:28 +0200 | [diff] [blame] | 82 | !disk_live(disk) || |
| 83 | (disk->flags & GENHD_FL_HIDDEN)) |
Christoph Hellwig | a782483 | 2020-11-26 18:43:37 +0100 | [diff] [blame] | 84 | return false; |
Balbir Singh | e598a72 | 2020-03-13 05:30:05 +0000 | [diff] [blame] | 85 | |
Christoph Hellwig | a782483 | 2020-11-26 18:43:37 +0100 | [diff] [blame] | 86 | pr_info("%s: detected capacity change from %lld to %lld\n", |
Ming Lei | 452c0bf | 2021-02-23 16:50:15 +0800 | [diff] [blame] | 87 | disk->disk_name, capacity, size); |
Christoph Hellwig | 7e890c3 | 2020-11-12 17:50:04 +0100 | [diff] [blame] | 88 | |
Christoph Hellwig | a782483 | 2020-11-26 18:43:37 +0100 | [diff] [blame] | 89 | /* |
| 90 | * Historically we did not send a uevent for changes to/from an empty |
| 91 | * device. |
| 92 | */ |
| 93 | if (!capacity || !size) |
| 94 | return false; |
| 95 | kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); |
| 96 | return true; |
Balbir Singh | e598a72 | 2020-03-13 05:30:05 +0000 | [diff] [blame] | 97 | } |
Christoph Hellwig | 449f4ec | 2020-11-16 15:56:56 +0100 | [diff] [blame] | 98 | EXPORT_SYMBOL_GPL(set_capacity_and_notify); |
Balbir Singh | e598a72 | 2020-03-13 05:30:05 +0000 | [diff] [blame] | 99 | |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 100 | static void part_stat_read_all(struct block_device *part, |
| 101 | struct disk_stats *stat) |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 102 | { |
| 103 | int cpu; |
| 104 | |
| 105 | memset(stat, 0, sizeof(struct disk_stats)); |
| 106 | for_each_possible_cpu(cpu) { |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 107 | struct disk_stats *ptr = per_cpu_ptr(part->bd_stats, cpu); |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 108 | int group; |
| 109 | |
| 110 | for (group = 0; group < NR_STAT_GROUPS; group++) { |
| 111 | stat->nsecs[group] += ptr->nsecs[group]; |
| 112 | stat->sectors[group] += ptr->sectors[group]; |
| 113 | stat->ios[group] += ptr->ios[group]; |
| 114 | stat->merges[group] += ptr->merges[group]; |
| 115 | } |
| 116 | |
| 117 | stat->io_ticks += ptr->io_ticks; |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 118 | } |
| 119 | } |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 120 | |
Christoph Hellwig | 8446fe9 | 2020-11-24 09:36:54 +0100 | [diff] [blame] | 121 | static unsigned int part_in_flight(struct block_device *part) |
Jens Axboe | f299b7c | 2017-08-08 17:51:45 -0600 | [diff] [blame] | 122 | { |
Christoph Hellwig | b2f609e | 2020-05-13 12:49:33 +0200 | [diff] [blame] | 123 | unsigned int inflight = 0; |
Mikulas Patocka | 1226b8d | 2018-12-06 11:41:20 -0500 | [diff] [blame] | 124 | int cpu; |
| 125 | |
Mikulas Patocka | 1226b8d | 2018-12-06 11:41:20 -0500 | [diff] [blame] | 126 | for_each_possible_cpu(cpu) { |
Mikulas Patocka | e016b78 | 2018-12-06 11:41:21 -0500 | [diff] [blame] | 127 | inflight += part_stat_local_read_cpu(part, in_flight[0], cpu) + |
| 128 | part_stat_local_read_cpu(part, in_flight[1], cpu); |
Mikulas Patocka | 1226b8d | 2018-12-06 11:41:20 -0500 | [diff] [blame] | 129 | } |
Mikulas Patocka | e016b78 | 2018-12-06 11:41:21 -0500 | [diff] [blame] | 130 | if ((int)inflight < 0) |
| 131 | inflight = 0; |
Mikulas Patocka | 1226b8d | 2018-12-06 11:41:20 -0500 | [diff] [blame] | 132 | |
Mikulas Patocka | e016b78 | 2018-12-06 11:41:21 -0500 | [diff] [blame] | 133 | return inflight; |
Jens Axboe | f299b7c | 2017-08-08 17:51:45 -0600 | [diff] [blame] | 134 | } |
| 135 | |
Christoph Hellwig | 8446fe9 | 2020-11-24 09:36:54 +0100 | [diff] [blame] | 136 | static void part_in_flight_rw(struct block_device *part, |
| 137 | unsigned int inflight[2]) |
Omar Sandoval | bf0ddab | 2018-04-26 00:21:59 -0700 | [diff] [blame] | 138 | { |
Mikulas Patocka | 1226b8d | 2018-12-06 11:41:20 -0500 | [diff] [blame] | 139 | int cpu; |
| 140 | |
Mikulas Patocka | 1226b8d | 2018-12-06 11:41:20 -0500 | [diff] [blame] | 141 | inflight[0] = 0; |
| 142 | inflight[1] = 0; |
| 143 | for_each_possible_cpu(cpu) { |
| 144 | inflight[0] += part_stat_local_read_cpu(part, in_flight[0], cpu); |
| 145 | inflight[1] += part_stat_local_read_cpu(part, in_flight[1], cpu); |
| 146 | } |
| 147 | if ((int)inflight[0] < 0) |
| 148 | inflight[0] = 0; |
| 149 | if ((int)inflight[1] < 0) |
| 150 | inflight[1] = 0; |
Omar Sandoval | bf0ddab | 2018-04-26 00:21:59 -0700 | [diff] [blame] | 151 | } |
| 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | /* |
| 154 | * Can be deleted altogether. Later. |
| 155 | * |
| 156 | */ |
Logan Gunthorpe | 133d55c | 2017-06-16 17:48:21 -0600 | [diff] [blame] | 157 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | static struct blk_major_name { |
| 159 | struct blk_major_name *next; |
| 160 | int major; |
| 161 | char name[16]; |
Christoph Hellwig | fbdee71 | 2022-01-04 08:16:47 +0100 | [diff] [blame] | 162 | #ifdef CONFIG_BLOCK_LEGACY_AUTOLOAD |
Christoph Hellwig | a160c61 | 2020-10-29 15:58:28 +0100 | [diff] [blame] | 163 | void (*probe)(dev_t devt); |
Christoph Hellwig | fbdee71 | 2022-01-04 08:16:47 +0100 | [diff] [blame] | 164 | #endif |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 165 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
Christoph Hellwig | e49fbbb | 2020-10-29 15:58:26 +0100 | [diff] [blame] | 166 | static DEFINE_MUTEX(major_names_lock); |
Tetsuo Handa | dfbb340 | 2021-09-07 20:52:13 +0900 | [diff] [blame] | 167 | static DEFINE_SPINLOCK(major_names_spinlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
| 169 | /* index in the above - for now: assume no multimajor ranges */ |
Yang Zhang | e61eb2e | 2010-12-17 09:00:18 +0100 | [diff] [blame] | 170 | static inline int major_to_index(unsigned major) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | { |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 172 | return major % BLKDEV_MAJOR_HASH_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } |
| 174 | |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 175 | #ifdef CONFIG_PROC_FS |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 176 | void blkdev_show(struct seq_file *seqf, off_t offset) |
Neil Horman | 7170be5 | 2006-01-14 13:20:38 -0800 | [diff] [blame] | 177 | { |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 178 | struct blk_major_name *dp; |
Neil Horman | 7170be5 | 2006-01-14 13:20:38 -0800 | [diff] [blame] | 179 | |
Tetsuo Handa | dfbb340 | 2021-09-07 20:52:13 +0900 | [diff] [blame] | 180 | spin_lock(&major_names_spinlock); |
Logan Gunthorpe | 133d55c | 2017-06-16 17:48:21 -0600 | [diff] [blame] | 181 | for (dp = major_names[major_to_index(offset)]; dp; dp = dp->next) |
| 182 | if (dp->major == offset) |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 183 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
Tetsuo Handa | dfbb340 | 2021-09-07 20:52:13 +0900 | [diff] [blame] | 184 | spin_unlock(&major_names_spinlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 186 | #endif /* CONFIG_PROC_FS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
Márton Németh | 9e8c0bc | 2009-02-20 08:12:51 +0100 | [diff] [blame] | 188 | /** |
Christoph Hellwig | e2b6b30 | 2020-11-14 18:08:21 +0100 | [diff] [blame] | 189 | * __register_blkdev - register a new block device |
Márton Németh | 9e8c0bc | 2009-02-20 08:12:51 +0100 | [diff] [blame] | 190 | * |
Srivatsa S. Bhat | f33ff11 | 2018-02-05 18:25:27 -0800 | [diff] [blame] | 191 | * @major: the requested major device number [1..BLKDEV_MAJOR_MAX-1]. If |
| 192 | * @major = 0, try to allocate any unused major number. |
Márton Németh | 9e8c0bc | 2009-02-20 08:12:51 +0100 | [diff] [blame] | 193 | * @name: the name of the new block device as a zero terminated string |
Luis Chamberlain | 26e06f5 | 2021-11-03 16:04:34 -0700 | [diff] [blame] | 194 | * @probe: pre-devtmpfs / pre-udev callback used to create disks when their |
| 195 | * pre-created device node is accessed. When a probe call uses |
| 196 | * add_disk() and it fails the driver must cleanup resources. This |
| 197 | * interface may soon be removed. |
Márton Németh | 9e8c0bc | 2009-02-20 08:12:51 +0100 | [diff] [blame] | 198 | * |
| 199 | * The @name must be unique within the system. |
| 200 | * |
mchehab@s-opensource.com | 0e056eb | 2017-03-30 17:11:36 -0300 | [diff] [blame] | 201 | * The return value depends on the @major input parameter: |
| 202 | * |
Srivatsa S. Bhat | f33ff11 | 2018-02-05 18:25:27 -0800 | [diff] [blame] | 203 | * - if a major device number was requested in range [1..BLKDEV_MAJOR_MAX-1] |
| 204 | * then the function returns zero on success, or a negative error code |
mchehab@s-opensource.com | 0e056eb | 2017-03-30 17:11:36 -0300 | [diff] [blame] | 205 | * - if any unused major number was requested with @major = 0 parameter |
Márton Németh | 9e8c0bc | 2009-02-20 08:12:51 +0100 | [diff] [blame] | 206 | * then the return value is the allocated major number in range |
Srivatsa S. Bhat | f33ff11 | 2018-02-05 18:25:27 -0800 | [diff] [blame] | 207 | * [1..BLKDEV_MAJOR_MAX-1] or a negative error code otherwise |
| 208 | * |
| 209 | * See Documentation/admin-guide/devices.txt for the list of allocated |
| 210 | * major numbers. |
Christoph Hellwig | e2b6b30 | 2020-11-14 18:08:21 +0100 | [diff] [blame] | 211 | * |
| 212 | * Use register_blkdev instead for any new code. |
Márton Németh | 9e8c0bc | 2009-02-20 08:12:51 +0100 | [diff] [blame] | 213 | */ |
Christoph Hellwig | a160c61 | 2020-10-29 15:58:28 +0100 | [diff] [blame] | 214 | int __register_blkdev(unsigned int major, const char *name, |
| 215 | void (*probe)(dev_t devt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | { |
| 217 | struct blk_major_name **n, *p; |
| 218 | int index, ret = 0; |
| 219 | |
Christoph Hellwig | e49fbbb | 2020-10-29 15:58:26 +0100 | [diff] [blame] | 220 | mutex_lock(&major_names_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
| 222 | /* temporary */ |
| 223 | if (major == 0) { |
| 224 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { |
| 225 | if (major_names[index] == NULL) |
| 226 | break; |
| 227 | } |
| 228 | |
| 229 | if (index == 0) { |
Keyur Patel | dfc76d1 | 2019-02-17 10:21:56 -0500 | [diff] [blame] | 230 | printk("%s: failed to get major for %s\n", |
| 231 | __func__, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | ret = -EBUSY; |
| 233 | goto out; |
| 234 | } |
| 235 | major = index; |
| 236 | ret = major; |
| 237 | } |
| 238 | |
Logan Gunthorpe | 133d55c | 2017-06-16 17:48:21 -0600 | [diff] [blame] | 239 | if (major >= BLKDEV_MAJOR_MAX) { |
Keyur Patel | dfc76d1 | 2019-02-17 10:21:56 -0500 | [diff] [blame] | 240 | pr_err("%s: major requested (%u) is greater than the maximum (%u) for %s\n", |
| 241 | __func__, major, BLKDEV_MAJOR_MAX-1, name); |
Logan Gunthorpe | 133d55c | 2017-06-16 17:48:21 -0600 | [diff] [blame] | 242 | |
| 243 | ret = -EINVAL; |
| 244 | goto out; |
| 245 | } |
| 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); |
| 248 | if (p == NULL) { |
| 249 | ret = -ENOMEM; |
| 250 | goto out; |
| 251 | } |
| 252 | |
| 253 | p->major = major; |
Christoph Hellwig | fbdee71 | 2022-01-04 08:16:47 +0100 | [diff] [blame] | 254 | #ifdef CONFIG_BLOCK_LEGACY_AUTOLOAD |
Christoph Hellwig | a160c61 | 2020-10-29 15:58:28 +0100 | [diff] [blame] | 255 | p->probe = probe; |
Christoph Hellwig | fbdee71 | 2022-01-04 08:16:47 +0100 | [diff] [blame] | 256 | #endif |
Azeem Shaikh | 20d0997 | 2023-05-30 15:56:08 +0000 | [diff] [blame] | 257 | strscpy(p->name, name, sizeof(p->name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | p->next = NULL; |
| 259 | index = major_to_index(major); |
| 260 | |
Tetsuo Handa | dfbb340 | 2021-09-07 20:52:13 +0900 | [diff] [blame] | 261 | spin_lock(&major_names_spinlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | for (n = &major_names[index]; *n; n = &(*n)->next) { |
| 263 | if ((*n)->major == major) |
| 264 | break; |
| 265 | } |
| 266 | if (!*n) |
| 267 | *n = p; |
| 268 | else |
| 269 | ret = -EBUSY; |
Tetsuo Handa | dfbb340 | 2021-09-07 20:52:13 +0900 | [diff] [blame] | 270 | spin_unlock(&major_names_spinlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
| 272 | if (ret < 0) { |
Srivatsa S. Bhat | f33ff11 | 2018-02-05 18:25:27 -0800 | [diff] [blame] | 273 | printk("register_blkdev: cannot get major %u for %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | major, name); |
| 275 | kfree(p); |
| 276 | } |
| 277 | out: |
Christoph Hellwig | e49fbbb | 2020-10-29 15:58:26 +0100 | [diff] [blame] | 278 | mutex_unlock(&major_names_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | return ret; |
| 280 | } |
Christoph Hellwig | a160c61 | 2020-10-29 15:58:28 +0100 | [diff] [blame] | 281 | EXPORT_SYMBOL(__register_blkdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Akinobu Mita | f448024 | 2007-07-17 04:03:47 -0700 | [diff] [blame] | 283 | void unregister_blkdev(unsigned int major, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | { |
| 285 | struct blk_major_name **n; |
| 286 | struct blk_major_name *p = NULL; |
| 287 | int index = major_to_index(major); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
Christoph Hellwig | e49fbbb | 2020-10-29 15:58:26 +0100 | [diff] [blame] | 289 | mutex_lock(&major_names_lock); |
Tetsuo Handa | dfbb340 | 2021-09-07 20:52:13 +0900 | [diff] [blame] | 290 | spin_lock(&major_names_spinlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | for (n = &major_names[index]; *n; n = &(*n)->next) |
| 292 | if ((*n)->major == major) |
| 293 | break; |
Akinobu Mita | 294462a | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 294 | if (!*n || strcmp((*n)->name, name)) { |
| 295 | WARN_ON(1); |
Akinobu Mita | 294462a | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 296 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | p = *n; |
| 298 | *n = p->next; |
| 299 | } |
Tetsuo Handa | dfbb340 | 2021-09-07 20:52:13 +0900 | [diff] [blame] | 300 | spin_unlock(&major_names_spinlock); |
Christoph Hellwig | e49fbbb | 2020-10-29 15:58:26 +0100 | [diff] [blame] | 301 | mutex_unlock(&major_names_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | kfree(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } |
| 304 | |
| 305 | EXPORT_SYMBOL(unregister_blkdev); |
| 306 | |
Christoph Hellwig | 7c3f828 | 2021-05-21 07:50:51 +0200 | [diff] [blame] | 307 | int blk_alloc_ext_minor(void) |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 308 | { |
Tejun Heo | bab998d | 2013-02-27 17:03:57 -0800 | [diff] [blame] | 309 | int idx; |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 310 | |
Christophe JAILLET | d186832 | 2022-03-26 15:50:46 +0100 | [diff] [blame] | 311 | idx = ida_alloc_range(&ext_devt_ida, 0, NR_EXT_DEVT - 1, GFP_KERNEL); |
Christoph Hellwig | c4b2b7d | 2021-08-24 09:52:16 +0200 | [diff] [blame] | 312 | if (idx == -ENOSPC) |
| 313 | return -EBUSY; |
| 314 | return idx; |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 315 | } |
| 316 | |
Christoph Hellwig | 7c3f828 | 2021-05-21 07:50:51 +0200 | [diff] [blame] | 317 | void blk_free_ext_minor(unsigned int minor) |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 318 | { |
Christoph Hellwig | c4b2b7d | 2021-08-24 09:52:16 +0200 | [diff] [blame] | 319 | ida_free(&ext_devt_ida, minor); |
Yufen Yu | 6fcc44d | 2019-04-02 20:06:34 +0800 | [diff] [blame] | 320 | } |
| 321 | |
Christoph Hellwig | bc359d0 | 2021-01-24 11:02:39 +0100 | [diff] [blame] | 322 | void disk_uevent(struct gendisk *disk, enum kobject_action action) |
| 323 | { |
Christoph Hellwig | bc359d0 | 2021-01-24 11:02:39 +0100 | [diff] [blame] | 324 | struct block_device *part; |
Christoph Hellwig | 3212135 | 2021-04-06 08:23:02 +0200 | [diff] [blame] | 325 | unsigned long idx; |
Christoph Hellwig | bc359d0 | 2021-01-24 11:02:39 +0100 | [diff] [blame] | 326 | |
Christoph Hellwig | 3212135 | 2021-04-06 08:23:02 +0200 | [diff] [blame] | 327 | rcu_read_lock(); |
| 328 | xa_for_each(&disk->part_tbl, idx, part) { |
| 329 | if (bdev_is_partition(part) && !bdev_nr_sectors(part)) |
| 330 | continue; |
Christoph Hellwig | 498dcc1 | 2021-07-01 10:16:37 +0200 | [diff] [blame] | 331 | if (!kobject_get_unless_zero(&part->bd_device.kobj)) |
Christoph Hellwig | 3212135 | 2021-04-06 08:23:02 +0200 | [diff] [blame] | 332 | continue; |
| 333 | |
| 334 | rcu_read_unlock(); |
Christoph Hellwig | bc359d0 | 2021-01-24 11:02:39 +0100 | [diff] [blame] | 335 | kobject_uevent(bdev_kobj(part), action); |
Christoph Hellwig | 498dcc1 | 2021-07-01 10:16:37 +0200 | [diff] [blame] | 336 | put_device(&part->bd_device); |
Christoph Hellwig | 3212135 | 2021-04-06 08:23:02 +0200 | [diff] [blame] | 337 | rcu_read_lock(); |
| 338 | } |
| 339 | rcu_read_unlock(); |
Christoph Hellwig | bc359d0 | 2021-01-24 11:02:39 +0100 | [diff] [blame] | 340 | } |
| 341 | EXPORT_SYMBOL_GPL(disk_uevent); |
| 342 | |
Christoph Hellwig | 05bdb99 | 2023-06-08 13:02:55 +0200 | [diff] [blame] | 343 | int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode) |
Christoph Hellwig | 9301fe7 | 2020-09-21 09:19:46 +0200 | [diff] [blame] | 344 | { |
Christian Brauner | 190f676 | 2024-01-23 14:26:20 +0100 | [diff] [blame] | 345 | struct file *file; |
Yu Kuai | e5cfefa | 2023-02-17 10:22:00 +0800 | [diff] [blame] | 346 | int ret = 0; |
Christoph Hellwig | 9301fe7 | 2020-09-21 09:19:46 +0200 | [diff] [blame] | 347 | |
Christoph Hellwig | 9f18db5 | 2021-11-22 14:06:23 +0100 | [diff] [blame] | 348 | if (disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) |
Christoph Hellwig | e16e506 | 2021-11-22 14:06:16 +0100 | [diff] [blame] | 349 | return -EINVAL; |
Christoph Hellwig | b9684a7 | 2022-05-27 07:58:06 +0200 | [diff] [blame] | 350 | if (test_bit(GD_SUPPRESS_PART_SCAN, &disk->state)) |
| 351 | return -EINVAL; |
Christoph Hellwig | e16e506 | 2021-11-22 14:06:16 +0100 | [diff] [blame] | 352 | if (disk->open_partitions) |
| 353 | return -EBUSY; |
Christoph Hellwig | 9301fe7 | 2020-09-21 09:19:46 +0200 | [diff] [blame] | 354 | |
Yu Kuai | e5cfefa | 2023-02-17 10:22:00 +0800 | [diff] [blame] | 355 | /* |
| 356 | * If the device is opened exclusively by current thread already, it's |
| 357 | * safe to scan partitons, otherwise, use bd_prepare_to_claim() to |
| 358 | * synchronize with other exclusive openers and other partition |
| 359 | * scanners. |
| 360 | */ |
Christoph Hellwig | 05bdb99 | 2023-06-08 13:02:55 +0200 | [diff] [blame] | 361 | if (!(mode & BLK_OPEN_EXCL)) { |
Christoph Hellwig | 0718afd | 2023-06-01 11:44:52 +0200 | [diff] [blame] | 362 | ret = bd_prepare_to_claim(disk->part0, disk_scan_partitions, |
| 363 | NULL); |
Yu Kuai | e5cfefa | 2023-02-17 10:22:00 +0800 | [diff] [blame] | 364 | if (ret) |
| 365 | return ret; |
| 366 | } |
| 367 | |
Yu Kuai | 3723091 | 2023-03-22 11:59:26 +0800 | [diff] [blame] | 368 | set_bit(GD_NEED_PART_SCAN, &disk->state); |
Christian Brauner | 190f676 | 2024-01-23 14:26:20 +0100 | [diff] [blame] | 369 | file = bdev_file_open_by_dev(disk_devt(disk), mode & ~BLK_OPEN_EXCL, |
| 370 | NULL, NULL); |
| 371 | if (IS_ERR(file)) |
| 372 | ret = PTR_ERR(file); |
Yu Kuai | e5cfefa | 2023-02-17 10:22:00 +0800 | [diff] [blame] | 373 | else |
Christian Brauner | 190f676 | 2024-01-23 14:26:20 +0100 | [diff] [blame] | 374 | fput(file); |
Yu Kuai | e5cfefa | 2023-02-17 10:22:00 +0800 | [diff] [blame] | 375 | |
Yu Kuai | 3723091 | 2023-03-22 11:59:26 +0800 | [diff] [blame] | 376 | /* |
| 377 | * If blkdev_get_by_dev() failed early, GD_NEED_PART_SCAN is still set, |
| 378 | * and this will cause that re-assemble partitioned raid device will |
| 379 | * creat partition for underlying disk. |
| 380 | */ |
| 381 | clear_bit(GD_NEED_PART_SCAN, &disk->state); |
Christoph Hellwig | 05bdb99 | 2023-06-08 13:02:55 +0200 | [diff] [blame] | 382 | if (!(mode & BLK_OPEN_EXCL)) |
Yu Kuai | e5cfefa | 2023-02-17 10:22:00 +0800 | [diff] [blame] | 383 | bd_abort_claiming(disk->part0, disk_scan_partitions); |
| 384 | return ret; |
Christoph Hellwig | 9301fe7 | 2020-09-21 09:19:46 +0200 | [diff] [blame] | 385 | } |
| 386 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | /** |
Christoph Hellwig | d1254a8 | 2021-08-04 11:41:47 +0200 | [diff] [blame] | 388 | * device_add_disk - add disk information to kernel list |
Dan Williams | e63a46b | 2016-06-15 18:17:27 -0700 | [diff] [blame] | 389 | * @parent: parent device for the disk |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | * @disk: per-device partitioning information |
Hannes Reinecke | fef912b | 2018-09-28 08:17:19 +0200 | [diff] [blame] | 391 | * @groups: Additional per-device sysfs groups |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | * |
| 393 | * This function registers the partitioning information in @disk |
| 394 | * with the kernel. |
| 395 | */ |
Luis Chamberlain | 278167f | 2021-11-09 16:29:49 -0800 | [diff] [blame] | 396 | int __must_check device_add_disk(struct device *parent, struct gendisk *disk, |
| 397 | const struct attribute_group **groups) |
Christoph Hellwig | d1254a8 | 2021-08-04 11:41:47 +0200 | [diff] [blame] | 398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
Christoph Hellwig | 52b8590 | 2021-08-18 16:45:33 +0200 | [diff] [blame] | 400 | struct device *ddev = disk_to_dev(disk); |
Christoph Hellwig | 7c3f828 | 2021-05-21 07:50:51 +0200 | [diff] [blame] | 401 | int ret; |
Peter Zijlstra | cf0ca9f | 2008-04-30 00:54:32 -0700 | [diff] [blame] | 402 | |
Ming Lei | 69fe0f2 | 2022-03-04 21:08:03 -0500 | [diff] [blame] | 403 | /* Only makes sense for bio-based to set ->poll_bio */ |
| 404 | if (queue_is_mq(disk->queue) && disk->fops->poll_bio) |
| 405 | return -EINVAL; |
| 406 | |
Damien Le Moal | 737eb78 | 2019-09-05 18:51:33 +0900 | [diff] [blame] | 407 | /* |
| 408 | * The disk queue should now be all set with enough information about |
| 409 | * the device for the elevator code to pick an adequate default |
| 410 | * elevator if one is needed, that is, for devices requesting queue |
| 411 | * registration. |
| 412 | */ |
Christoph Hellwig | d1254a8 | 2021-08-04 11:41:47 +0200 | [diff] [blame] | 413 | elevator_init_mq(disk->queue); |
Damien Le Moal | 737eb78 | 2019-09-05 18:51:33 +0900 | [diff] [blame] | 414 | |
Jens Axboe | 9f4107b | 2023-04-14 07:32:02 -0600 | [diff] [blame] | 415 | /* Mark bdev as having a submit_bio, if needed */ |
| 416 | disk->part0->bd_has_submit_bio = disk->fops->submit_bio != NULL; |
| 417 | |
Christoph Hellwig | 7c3f828 | 2021-05-21 07:50:51 +0200 | [diff] [blame] | 418 | /* |
| 419 | * If the driver provides an explicit major number it also must provide |
| 420 | * the number of minors numbers supported, and those will be used to |
| 421 | * setup the gendisk. |
| 422 | * Otherwise just allocate the device numbers for both the whole device |
| 423 | * and all partitions from the extended dev_t space. |
Tejun Heo | 3e1a7ff | 2008-08-25 19:56:17 +0900 | [diff] [blame] | 424 | */ |
Yu Kuai | 02341a0 | 2022-10-22 10:16:15 +0800 | [diff] [blame] | 425 | ret = -EINVAL; |
Christoph Hellwig | 7c3f828 | 2021-05-21 07:50:51 +0200 | [diff] [blame] | 426 | if (disk->major) { |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 427 | if (WARN_ON(!disk->minors)) |
Yu Kuai | 02341a0 | 2022-10-22 10:16:15 +0800 | [diff] [blame] | 428 | goto out_exit_elevator; |
Christoph Hellwig | 2e3c73f | 2021-05-21 07:50:52 +0200 | [diff] [blame] | 429 | |
| 430 | if (disk->minors > DISK_MAX_PARTS) { |
| 431 | pr_err("block: can't allocate more than %d partitions\n", |
| 432 | DISK_MAX_PARTS); |
| 433 | disk->minors = DISK_MAX_PARTS; |
| 434 | } |
Li Nan | 4c43439 | 2023-12-19 15:59:42 +0800 | [diff] [blame] | 435 | if (disk->first_minor > MINORMASK || |
| 436 | disk->minors > MINORMASK + 1 || |
| 437 | disk->first_minor + disk->minors > MINORMASK + 1) |
Yu Kuai | 02341a0 | 2022-10-22 10:16:15 +0800 | [diff] [blame] | 438 | goto out_exit_elevator; |
Christoph Hellwig | 7c3f828 | 2021-05-21 07:50:51 +0200 | [diff] [blame] | 439 | } else { |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 440 | if (WARN_ON(disk->minors)) |
Yu Kuai | 02341a0 | 2022-10-22 10:16:15 +0800 | [diff] [blame] | 441 | goto out_exit_elevator; |
Christoph Hellwig | 7c3f828 | 2021-05-21 07:50:51 +0200 | [diff] [blame] | 442 | |
| 443 | ret = blk_alloc_ext_minor(); |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 444 | if (ret < 0) |
Yu Kuai | 02341a0 | 2022-10-22 10:16:15 +0800 | [diff] [blame] | 445 | goto out_exit_elevator; |
Christoph Hellwig | 7c3f828 | 2021-05-21 07:50:51 +0200 | [diff] [blame] | 446 | disk->major = BLOCK_EXT_MAJOR; |
Christoph Hellwig | 539711d | 2021-08-24 09:52:15 +0200 | [diff] [blame] | 447 | disk->first_minor = ret; |
Christoph Hellwig | 7c3f828 | 2021-05-21 07:50:51 +0200 | [diff] [blame] | 448 | } |
Tejun Heo | 3e1a7ff | 2008-08-25 19:56:17 +0900 | [diff] [blame] | 449 | |
Christoph Hellwig | 52b8590 | 2021-08-18 16:45:33 +0200 | [diff] [blame] | 450 | /* delay uevents, until we scanned partition table */ |
| 451 | dev_set_uevent_suppress(ddev, 1); |
| 452 | |
| 453 | ddev->parent = parent; |
| 454 | ddev->groups = groups; |
| 455 | dev_set_name(ddev, "%s", disk->disk_name); |
Christoph Hellwig | 8235b5c | 2021-08-18 16:45:34 +0200 | [diff] [blame] | 456 | if (!(disk->flags & GENHD_FL_HIDDEN)) |
| 457 | ddev->devt = MKDEV(disk->major, disk->first_minor); |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 458 | ret = device_add(ddev); |
| 459 | if (ret) |
Christoph Hellwig | 99d8690 | 2021-12-21 17:18:51 +0100 | [diff] [blame] | 460 | goto out_free_ext_minor; |
| 461 | |
| 462 | ret = disk_alloc_events(disk); |
| 463 | if (ret) |
| 464 | goto out_device_del; |
| 465 | |
Greg Kroah-Hartman | 721da5c | 2023-02-23 08:33:26 +0100 | [diff] [blame] | 466 | ret = sysfs_create_link(block_depr, &ddev->kobj, |
| 467 | kobject_name(&ddev->kobj)); |
| 468 | if (ret) |
| 469 | goto out_device_del; |
Christoph Hellwig | 52b8590 | 2021-08-18 16:45:33 +0200 | [diff] [blame] | 470 | |
| 471 | /* |
| 472 | * avoid probable deadlock caused by allocating memory with |
| 473 | * GFP_KERNEL in runtime_resume callback of its all ancestor |
| 474 | * devices |
| 475 | */ |
| 476 | pm_runtime_set_memalloc_noio(ddev, true); |
| 477 | |
| 478 | disk->part0->bd_holder_dir = |
| 479 | kobject_create_and_add("holders", &ddev->kobj); |
Luis Chamberlain | fe7d064 | 2021-11-03 09:40:23 -0700 | [diff] [blame] | 480 | if (!disk->part0->bd_holder_dir) { |
| 481 | ret = -ENOMEM; |
Thomas Weißschuh | ff53cd5 | 2023-03-18 17:36:25 +0000 | [diff] [blame] | 482 | goto out_del_block_link; |
Luis Chamberlain | fe7d064 | 2021-11-03 09:40:23 -0700 | [diff] [blame] | 483 | } |
Christoph Hellwig | 52b8590 | 2021-08-18 16:45:33 +0200 | [diff] [blame] | 484 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); |
Luis Chamberlain | fe7d064 | 2021-11-03 09:40:23 -0700 | [diff] [blame] | 485 | if (!disk->slave_dir) { |
| 486 | ret = -ENOMEM; |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 487 | goto out_put_holder_dir; |
Luis Chamberlain | fe7d064 | 2021-11-03 09:40:23 -0700 | [diff] [blame] | 488 | } |
Christoph Hellwig | 52b8590 | 2021-08-18 16:45:33 +0200 | [diff] [blame] | 489 | |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 490 | ret = blk_register_queue(disk); |
| 491 | if (ret) |
| 492 | goto out_put_slave_dir; |
Christoph Hellwig | 75f4dca | 2021-08-18 16:45:37 +0200 | [diff] [blame] | 493 | |
Christoph Hellwig | 9f18db5 | 2021-11-22 14:06:23 +0100 | [diff] [blame] | 494 | if (!(disk->flags & GENHD_FL_HIDDEN)) { |
Christoph Hellwig | 8235b5c | 2021-08-18 16:45:34 +0200 | [diff] [blame] | 495 | ret = bdi_register(disk->bdi, "%u:%u", |
| 496 | disk->major, disk->first_minor); |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 497 | if (ret) |
| 498 | goto out_unregister_queue; |
Christoph Hellwig | 8235b5c | 2021-08-18 16:45:34 +0200 | [diff] [blame] | 499 | bdi_set_owner(disk->bdi, ddev); |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 500 | ret = sysfs_create_link(&ddev->kobj, |
| 501 | &disk->bdi->dev->kobj, "bdi"); |
| 502 | if (ret) |
| 503 | goto out_unregister_bdi; |
Christoph Hellwig | 8235b5c | 2021-08-18 16:45:34 +0200 | [diff] [blame] | 504 | |
Yu Kuai | e5cfefa | 2023-02-17 10:22:00 +0800 | [diff] [blame] | 505 | /* Make sure the first partition scan will be proceed */ |
| 506 | if (get_capacity(disk) && !(disk->flags & GENHD_FL_NO_PART) && |
| 507 | !test_bit(GD_SUPPRESS_PART_SCAN, &disk->state)) |
| 508 | set_bit(GD_NEED_PART_SCAN, &disk->state); |
| 509 | |
Christoph Hellwig | 9d5ee67 | 2021-08-18 16:45:35 +0200 | [diff] [blame] | 510 | bdev_add(disk->part0, ddev->devt); |
Christoph Hellwig | e16e506 | 2021-11-22 14:06:16 +0100 | [diff] [blame] | 511 | if (get_capacity(disk)) |
Christoph Hellwig | 05bdb99 | 2023-06-08 13:02:55 +0200 | [diff] [blame] | 512 | disk_scan_partitions(disk, BLK_OPEN_READ); |
Christoph Hellwig | 52b8590 | 2021-08-18 16:45:33 +0200 | [diff] [blame] | 513 | |
| 514 | /* |
| 515 | * Announce the disk and partitions after all partitions are |
Christoph Hellwig | 8235b5c | 2021-08-18 16:45:34 +0200 | [diff] [blame] | 516 | * created. (for hidden disks uevents remain suppressed forever) |
Christoph Hellwig | 52b8590 | 2021-08-18 16:45:33 +0200 | [diff] [blame] | 517 | */ |
| 518 | dev_set_uevent_suppress(ddev, 0); |
| 519 | disk_uevent(disk, KOBJ_ADD); |
Christoph Hellwig | a0a6314 | 2022-10-10 15:18:57 +0200 | [diff] [blame] | 520 | } else { |
| 521 | /* |
| 522 | * Even if the block_device for a hidden gendisk is not |
| 523 | * registered, it needs to have a valid bd_dev so that the |
| 524 | * freeing of the dynamic major works. |
| 525 | */ |
| 526 | disk->part0->bd_dev = MKDEV(disk->major, disk->first_minor); |
Christoph Hellwig | 52b8590 | 2021-08-18 16:45:33 +0200 | [diff] [blame] | 527 | } |
| 528 | |
Christoph Hellwig | 75f4dca | 2021-08-18 16:45:37 +0200 | [diff] [blame] | 529 | disk_update_readahead(disk); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 530 | disk_add_events(disk); |
Christoph Hellwig | 7679205 | 2022-02-15 10:45:10 +0100 | [diff] [blame] | 531 | set_bit(GD_ADDED, &disk->state); |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 532 | return 0; |
| 533 | |
| 534 | out_unregister_bdi: |
| 535 | if (!(disk->flags & GENHD_FL_HIDDEN)) |
| 536 | bdi_unregister(disk->bdi); |
| 537 | out_unregister_queue: |
| 538 | blk_unregister_queue(disk); |
Chen Zhongjin | fa81cba | 2022-10-29 15:13:55 +0800 | [diff] [blame] | 539 | rq_qos_exit(disk->queue); |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 540 | out_put_slave_dir: |
| 541 | kobject_put(disk->slave_dir); |
Christoph Hellwig | d90db3b | 2022-11-15 22:10:45 +0800 | [diff] [blame] | 542 | disk->slave_dir = NULL; |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 543 | out_put_holder_dir: |
| 544 | kobject_put(disk->part0->bd_holder_dir); |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 545 | out_del_block_link: |
Greg Kroah-Hartman | 721da5c | 2023-02-23 08:33:26 +0100 | [diff] [blame] | 546 | sysfs_remove_link(block_depr, dev_name(ddev)); |
Li Nan | 5fa3d1a | 2023-12-11 15:53:56 +0800 | [diff] [blame] | 547 | pm_runtime_set_memalloc_noio(ddev, false); |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 548 | out_device_del: |
| 549 | device_del(ddev); |
Luis Chamberlain | 83cbce9 | 2021-08-18 16:45:40 +0200 | [diff] [blame] | 550 | out_free_ext_minor: |
| 551 | if (disk->major == BLOCK_EXT_MAJOR) |
| 552 | blk_free_ext_minor(disk->first_minor); |
Yu Kuai | 02341a0 | 2022-10-22 10:16:15 +0800 | [diff] [blame] | 553 | out_exit_elevator: |
| 554 | if (disk->queue->elevator) |
| 555 | elevator_exit(disk->queue); |
Luis Chamberlain | 278167f | 2021-11-09 16:29:49 -0800 | [diff] [blame] | 556 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
Dan Williams | e63a46b | 2016-06-15 18:17:27 -0700 | [diff] [blame] | 558 | EXPORT_SYMBOL(device_add_disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | |
Christoph Hellwig | d8530de | 2023-08-11 12:08:25 +0200 | [diff] [blame] | 560 | static void blk_report_disk_dead(struct gendisk *disk, bool surprise) |
Christoph Hellwig | f55e017 | 2023-06-01 11:44:53 +0200 | [diff] [blame] | 561 | { |
| 562 | struct block_device *bdev; |
| 563 | unsigned long idx; |
| 564 | |
Christian Brauner | f610333 | 2023-10-17 20:48:22 +0200 | [diff] [blame] | 565 | /* |
| 566 | * On surprise disk removal, bdev_mark_dead() may call into file |
| 567 | * systems below. Make it clear that we're expecting to not hold |
| 568 | * disk->open_mutex. |
| 569 | */ |
| 570 | lockdep_assert_not_held(&disk->open_mutex); |
| 571 | |
Christoph Hellwig | f55e017 | 2023-06-01 11:44:53 +0200 | [diff] [blame] | 572 | rcu_read_lock(); |
| 573 | xa_for_each(&disk->part_tbl, idx, bdev) { |
| 574 | if (!kobject_get_unless_zero(&bdev->bd_device.kobj)) |
| 575 | continue; |
| 576 | rcu_read_unlock(); |
| 577 | |
Christoph Hellwig | d8530de | 2023-08-11 12:08:25 +0200 | [diff] [blame] | 578 | bdev_mark_dead(bdev, surprise); |
Christoph Hellwig | f55e017 | 2023-06-01 11:44:53 +0200 | [diff] [blame] | 579 | |
| 580 | put_device(&bdev->bd_device); |
| 581 | rcu_read_lock(); |
| 582 | } |
| 583 | rcu_read_unlock(); |
| 584 | } |
| 585 | |
Christoph Hellwig | d8530de | 2023-08-11 12:08:25 +0200 | [diff] [blame] | 586 | static void __blk_mark_disk_dead(struct gendisk *disk) |
Christoph Hellwig | 7a5428d | 2022-02-17 08:52:31 +0100 | [diff] [blame] | 587 | { |
Christoph Hellwig | 66fddc2 | 2023-06-01 11:44:47 +0200 | [diff] [blame] | 588 | /* |
| 589 | * Fail any new I/O. |
| 590 | */ |
Christoph Hellwig | a4f7576 | 2023-06-01 11:44:48 +0200 | [diff] [blame] | 591 | if (test_and_set_bit(GD_DEAD, &disk->state)) |
| 592 | return; |
| 593 | |
Christoph Hellwig | 66fddc2 | 2023-06-01 11:44:47 +0200 | [diff] [blame] | 594 | if (test_bit(GD_OWNS_QUEUE, &disk->state)) |
| 595 | blk_queue_flag_set(QUEUE_FLAG_DYING, disk->queue); |
Christoph Hellwig | 71b2608 | 2022-11-01 16:00:37 +0100 | [diff] [blame] | 596 | |
| 597 | /* |
| 598 | * Stop buffered writers from dirtying pages that can't be written out. |
| 599 | */ |
Christoph Hellwig | 66fddc2 | 2023-06-01 11:44:47 +0200 | [diff] [blame] | 600 | set_capacity(disk, 0); |
| 601 | |
| 602 | /* |
| 603 | * Prevent new I/O from crossing bio_queue_enter(). |
| 604 | */ |
| 605 | blk_queue_start_drain(disk->queue); |
Christoph Hellwig | d8530de | 2023-08-11 12:08:25 +0200 | [diff] [blame] | 606 | } |
Christoph Hellwig | f55e017 | 2023-06-01 11:44:53 +0200 | [diff] [blame] | 607 | |
Christoph Hellwig | d8530de | 2023-08-11 12:08:25 +0200 | [diff] [blame] | 608 | /** |
| 609 | * blk_mark_disk_dead - mark a disk as dead |
| 610 | * @disk: disk to mark as dead |
| 611 | * |
| 612 | * Mark as disk as dead (e.g. surprise removed) and don't accept any new I/O |
| 613 | * to this disk. |
| 614 | */ |
| 615 | void blk_mark_disk_dead(struct gendisk *disk) |
| 616 | { |
| 617 | __blk_mark_disk_dead(disk); |
| 618 | blk_report_disk_dead(disk, true); |
Christoph Hellwig | 7a5428d | 2022-02-17 08:52:31 +0100 | [diff] [blame] | 619 | } |
| 620 | EXPORT_SYMBOL_GPL(blk_mark_disk_dead); |
| 621 | |
| 622 | /** |
Luis Chamberlain | b5bd357 | 2020-06-19 20:47:23 +0000 | [diff] [blame] | 623 | * del_gendisk - remove the gendisk |
| 624 | * @disk: the struct gendisk to remove |
| 625 | * |
| 626 | * Removes the gendisk and all its associated resources. This deletes the |
| 627 | * partitions associated with the gendisk, and unregisters the associated |
| 628 | * request_queue. |
| 629 | * |
| 630 | * This is the counter to the respective __device_add_disk() call. |
| 631 | * |
| 632 | * The final removal of the struct gendisk happens when its refcount reaches 0 |
| 633 | * with put_disk(), which should be called after del_gendisk(), if |
| 634 | * __device_add_disk() was used. |
Luis Chamberlain | e8c7d14 | 2020-06-19 20:47:25 +0000 | [diff] [blame] | 635 | * |
| 636 | * Drivers exist which depend on the release of the gendisk to be synchronous, |
| 637 | * it should not be deferred. |
| 638 | * |
| 639 | * Context: can sleep |
Luis Chamberlain | b5bd357 | 2020-06-19 20:47:23 +0000 | [diff] [blame] | 640 | */ |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 641 | void del_gendisk(struct gendisk *disk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | { |
Christoph Hellwig | 8e141f9 | 2021-09-29 09:12:40 +0200 | [diff] [blame] | 643 | struct request_queue *q = disk->queue; |
Christoph Hellwig | eec1be4 | 2023-06-01 11:44:50 +0200 | [diff] [blame] | 644 | struct block_device *part; |
| 645 | unsigned long idx; |
Christoph Hellwig | 8e141f9 | 2021-09-29 09:12:40 +0200 | [diff] [blame] | 646 | |
Luis Chamberlain | e8c7d14 | 2020-06-19 20:47:25 +0000 | [diff] [blame] | 647 | might_sleep(); |
| 648 | |
Christoph Hellwig | 9f28699 | 2021-08-24 16:43:10 +0200 | [diff] [blame] | 649 | if (WARN_ON_ONCE(!disk_live(disk) && !(disk->flags & GENHD_FL_HIDDEN))) |
Christoph Hellwig | 6b3ba97 | 2020-10-29 15:58:24 +0100 | [diff] [blame] | 650 | return; |
| 651 | |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 652 | disk_del_events(disk); |
| 653 | |
Christoph Hellwig | eec1be4 | 2023-06-01 11:44:50 +0200 | [diff] [blame] | 654 | /* |
Christoph Hellwig | d8530de | 2023-08-11 12:08:25 +0200 | [diff] [blame] | 655 | * Prevent new openers by unlinked the bdev inode. |
Christoph Hellwig | eec1be4 | 2023-06-01 11:44:50 +0200 | [diff] [blame] | 656 | */ |
Christoph Hellwig | a869870 | 2021-05-25 08:12:56 +0200 | [diff] [blame] | 657 | mutex_lock(&disk->open_mutex); |
Christoph Hellwig | d8530de | 2023-08-11 12:08:25 +0200 | [diff] [blame] | 658 | xa_for_each(&disk->part_tbl, idx, part) |
Christoph Hellwig | eec1be4 | 2023-06-01 11:44:50 +0200 | [diff] [blame] | 659 | remove_inode_hash(part->bd_inode); |
Christoph Hellwig | a869870 | 2021-05-25 08:12:56 +0200 | [diff] [blame] | 660 | mutex_unlock(&disk->open_mutex); |
Christoph Hellwig | c76f48e | 2021-04-06 08:22:56 +0200 | [diff] [blame] | 661 | |
Christoph Hellwig | d8530de | 2023-08-11 12:08:25 +0200 | [diff] [blame] | 662 | /* |
| 663 | * Tell the file system to write back all dirty data and shut down if |
| 664 | * it hasn't been notified earlier. |
| 665 | */ |
| 666 | if (!test_bit(GD_DEAD, &disk->state)) |
| 667 | blk_report_disk_dead(disk, false); |
| 668 | __blk_mark_disk_dead(disk); |
Christoph Hellwig | 8e141f9 | 2021-09-29 09:12:40 +0200 | [diff] [blame] | 669 | |
Christoph Hellwig | eec1be4 | 2023-06-01 11:44:50 +0200 | [diff] [blame] | 670 | /* |
| 671 | * Drop all partitions now that the disk is marked dead. |
| 672 | */ |
| 673 | mutex_lock(&disk->open_mutex); |
| 674 | xa_for_each_start(&disk->part_tbl, idx, part, 1) |
| 675 | drop_partition(part); |
| 676 | mutex_unlock(&disk->open_mutex); |
| 677 | |
Christoph Hellwig | 6b3ba97 | 2020-10-29 15:58:24 +0100 | [diff] [blame] | 678 | if (!(disk->flags & GENHD_FL_HIDDEN)) { |
Christoph Hellwig | 8ddcd65 | 2017-11-02 21:29:53 +0300 | [diff] [blame] | 679 | sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
Christoph Hellwig | 6b3ba97 | 2020-10-29 15:58:24 +0100 | [diff] [blame] | 680 | |
Jan Kara | 90f16fd | 2017-03-08 17:48:33 +0100 | [diff] [blame] | 681 | /* |
| 682 | * Unregister bdi before releasing device numbers (as they can |
| 683 | * get reused and we'd get clashes in sysfs). |
| 684 | */ |
Christoph Hellwig | edb0872 | 2021-08-09 16:17:43 +0200 | [diff] [blame] | 685 | bdi_unregister(disk->bdi); |
Jan Kara | 90f16fd | 2017-03-08 17:48:33 +0100 | [diff] [blame] | 686 | } |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 687 | |
Christoph Hellwig | 6b3ba97 | 2020-10-29 15:58:24 +0100 | [diff] [blame] | 688 | blk_unregister_queue(disk); |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 689 | |
Christoph Hellwig | cb8432d | 2020-11-26 18:47:17 +0100 | [diff] [blame] | 690 | kobject_put(disk->part0->bd_holder_dir); |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 691 | kobject_put(disk->slave_dir); |
Christoph Hellwig | d90db3b | 2022-11-15 22:10:45 +0800 | [diff] [blame] | 692 | disk->slave_dir = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
Christoph Hellwig | 8446fe9 | 2020-11-24 09:36:54 +0100 | [diff] [blame] | 694 | part_stat_set_all(disk->part0, 0); |
Christoph Hellwig | cb8432d | 2020-11-26 18:47:17 +0100 | [diff] [blame] | 695 | disk->part0->bd_stamp = 0; |
Greg Kroah-Hartman | 721da5c | 2023-02-23 08:33:26 +0100 | [diff] [blame] | 696 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); |
Ming Lei | 25e823c | 2013-02-22 16:34:13 -0800 | [diff] [blame] | 697 | pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 698 | device_del(disk_to_dev(disk)); |
Ming Lei | d308ae0 | 2021-10-26 18:12:04 +0800 | [diff] [blame] | 699 | |
Christoph Hellwig | 4c66a32 | 2022-09-19 16:40:49 +0200 | [diff] [blame] | 700 | blk_mq_freeze_queue_wait(q); |
| 701 | |
Christoph Hellwig | cad9266 | 2022-09-21 20:04:58 +0200 | [diff] [blame] | 702 | blk_throtl_cancel_bios(disk); |
Yu Kuai | 8f9e7b65 | 2022-03-18 21:01:44 +0800 | [diff] [blame] | 703 | |
Ming Lei | d308ae0 | 2021-10-26 18:12:04 +0800 | [diff] [blame] | 704 | blk_sync_queue(q); |
| 705 | blk_flush_integrity(); |
Jinlong Chen | 219cf43 | 2022-10-30 17:47:30 +0800 | [diff] [blame] | 706 | |
| 707 | if (queue_is_mq(q)) |
| 708 | blk_mq_cancel_work_sync(q); |
Christoph Hellwig | 50e34d7 | 2022-06-14 09:48:24 +0200 | [diff] [blame] | 709 | |
| 710 | blk_mq_quiesce_queue(q); |
| 711 | if (q->elevator) { |
| 712 | mutex_lock(&q->sysfs_lock); |
| 713 | elevator_exit(q); |
| 714 | mutex_unlock(&q->sysfs_lock); |
| 715 | } |
| 716 | rq_qos_exit(q); |
| 717 | blk_mq_unquiesce_queue(q); |
| 718 | |
Ming Lei | d308ae0 | 2021-10-26 18:12:04 +0800 | [diff] [blame] | 719 | /* |
Christoph Hellwig | 6f8191f | 2022-06-19 08:05:51 +0200 | [diff] [blame] | 720 | * If the disk does not own the queue, allow using passthrough requests |
| 721 | * again. Else leave the queue frozen to fail all I/O. |
Ming Lei | d308ae0 | 2021-10-26 18:12:04 +0800 | [diff] [blame] | 722 | */ |
Christoph Hellwig | 6f8191f | 2022-06-19 08:05:51 +0200 | [diff] [blame] | 723 | if (!test_bit(GD_OWNS_QUEUE, &disk->state)) { |
| 724 | blk_queue_flag_clear(QUEUE_FLAG_INIT_DONE, q); |
| 725 | __blk_mq_unfreeze_queue(q, true); |
| 726 | } else { |
| 727 | if (queue_is_mq(q)) |
| 728 | blk_mq_exit_queue(q); |
| 729 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | } |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 731 | EXPORT_SYMBOL(del_gendisk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Xie Yongji | f059a1d | 2021-09-22 20:37:08 +0800 | [diff] [blame] | 733 | /** |
| 734 | * invalidate_disk - invalidate the disk |
| 735 | * @disk: the struct gendisk to invalidate |
| 736 | * |
| 737 | * A helper to invalidates the disk. It will clean the disk's associated |
| 738 | * buffer/page caches and reset its internal states so that the disk |
| 739 | * can be reused by the drivers. |
| 740 | * |
| 741 | * Context: can sleep |
| 742 | */ |
| 743 | void invalidate_disk(struct gendisk *disk) |
| 744 | { |
| 745 | struct block_device *bdev = disk->part0; |
| 746 | |
| 747 | invalidate_bdev(bdev); |
| 748 | bdev->bd_inode->i_mapping->wb_err = 0; |
| 749 | set_capacity(disk, 0); |
| 750 | } |
| 751 | EXPORT_SYMBOL(invalidate_disk); |
| 752 | |
Vishal Verma | 99e6608 | 2016-01-09 08:36:51 -0800 | [diff] [blame] | 753 | /* sysfs access to bad-blocks list. */ |
| 754 | static ssize_t disk_badblocks_show(struct device *dev, |
| 755 | struct device_attribute *attr, |
| 756 | char *page) |
| 757 | { |
| 758 | struct gendisk *disk = dev_to_disk(dev); |
| 759 | |
| 760 | if (!disk->bb) |
| 761 | return sprintf(page, "\n"); |
| 762 | |
| 763 | return badblocks_show(disk->bb, page, 0); |
| 764 | } |
| 765 | |
| 766 | static ssize_t disk_badblocks_store(struct device *dev, |
| 767 | struct device_attribute *attr, |
| 768 | const char *page, size_t len) |
| 769 | { |
| 770 | struct gendisk *disk = dev_to_disk(dev); |
| 771 | |
| 772 | if (!disk->bb) |
| 773 | return -ENXIO; |
| 774 | |
| 775 | return badblocks_store(disk->bb, page, len, 0); |
| 776 | } |
| 777 | |
Christoph Hellwig | fbdee71 | 2022-01-04 08:16:47 +0100 | [diff] [blame] | 778 | #ifdef CONFIG_BLOCK_LEGACY_AUTOLOAD |
Christoph Hellwig | 22ae8ce | 2020-11-26 09:23:26 +0100 | [diff] [blame] | 779 | void blk_request_module(dev_t devt) |
Christoph Hellwig | bd8eff3 | 2020-10-29 15:58:27 +0100 | [diff] [blame] | 780 | { |
Christoph Hellwig | a160c61 | 2020-10-29 15:58:28 +0100 | [diff] [blame] | 781 | unsigned int major = MAJOR(devt); |
| 782 | struct blk_major_name **n; |
| 783 | |
| 784 | mutex_lock(&major_names_lock); |
| 785 | for (n = &major_names[major_to_index(major)]; *n; n = &(*n)->next) { |
| 786 | if ((*n)->major == major && (*n)->probe) { |
| 787 | (*n)->probe(devt); |
| 788 | mutex_unlock(&major_names_lock); |
| 789 | return; |
| 790 | } |
| 791 | } |
| 792 | mutex_unlock(&major_names_lock); |
| 793 | |
Christoph Hellwig | bd8eff3 | 2020-10-29 15:58:27 +0100 | [diff] [blame] | 794 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
| 795 | /* Make old-style 2.4 aliases work */ |
| 796 | request_module("block-major-%d", MAJOR(devt)); |
| 797 | } |
Christoph Hellwig | fbdee71 | 2022-01-04 08:16:47 +0100 | [diff] [blame] | 798 | #endif /* CONFIG_BLOCK_LEGACY_AUTOLOAD */ |
Christoph Hellwig | bd8eff3 | 2020-10-29 15:58:27 +0100 | [diff] [blame] | 799 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | #ifdef CONFIG_PROC_FS |
| 801 | /* iterator */ |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 802 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
Greg Kroah-Hartman | 68c4d4a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 803 | { |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 804 | loff_t skip = *pos; |
| 805 | struct class_dev_iter *iter; |
| 806 | struct device *dev; |
Greg Kroah-Hartman | 68c4d4a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 807 | |
Harvey Harrison | aeb3d3a | 2008-08-28 09:27:42 +0200 | [diff] [blame] | 808 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 809 | if (!iter) |
| 810 | return ERR_PTR(-ENOMEM); |
| 811 | |
| 812 | seqf->private = iter; |
| 813 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); |
| 814 | do { |
| 815 | dev = class_dev_iter_next(iter); |
| 816 | if (!dev) |
| 817 | return NULL; |
| 818 | } while (skip--); |
| 819 | |
| 820 | return dev_to_disk(dev); |
Greg Kroah-Hartman | 68c4d4a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 821 | } |
| 822 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 823 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 825 | struct device *dev; |
Greg Kroah-Hartman | 66c64af | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 826 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 827 | (*pos)++; |
| 828 | dev = class_dev_iter_next(seqf->private); |
Tejun Heo | 2ac3cee | 2008-09-03 08:53:37 +0200 | [diff] [blame] | 829 | if (dev) |
Greg Kroah-Hartman | 68c4d4a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 830 | return dev_to_disk(dev); |
Tejun Heo | 2ac3cee | 2008-09-03 08:53:37 +0200 | [diff] [blame] | 831 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | return NULL; |
| 833 | } |
| 834 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 835 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
Greg Kroah-Hartman | 27f3025 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 836 | { |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 837 | struct class_dev_iter *iter = seqf->private; |
Greg Kroah-Hartman | 27f3025 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 838 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 839 | /* stop is called even after start failed :-( */ |
| 840 | if (iter) { |
| 841 | class_dev_iter_exit(iter); |
| 842 | kfree(iter); |
Vegard Nossum | 77da160 | 2016-07-29 10:40:31 +0200 | [diff] [blame] | 843 | seqf->private = NULL; |
Kay Sievers | 5c0ef6d | 2008-08-16 14:30:30 +0200 | [diff] [blame] | 844 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | } |
| 846 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 847 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | { |
Jianpeng Ma | 0676806 | 2012-08-03 10:42:00 +0200 | [diff] [blame] | 849 | void *p; |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 850 | |
| 851 | p = disk_seqf_start(seqf, pos); |
Yang Zhang | b9f985b | 2010-12-17 08:58:36 +0100 | [diff] [blame] | 852 | if (!IS_ERR_OR_NULL(p) && !*pos) |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 853 | seq_puts(seqf, "major minor #blocks name\n\n"); |
| 854 | return p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 857 | static int show_partition(struct seq_file *seqf, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | { |
| 859 | struct gendisk *sgp = v; |
Christoph Hellwig | ad1eaa5 | 2020-11-24 09:52:59 +0100 | [diff] [blame] | 860 | struct block_device *part; |
Christoph Hellwig | ecc75a9 | 2021-04-06 08:23:00 +0200 | [diff] [blame] | 861 | unsigned long idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | |
Christoph Hellwig | 3b5149a | 2021-11-22 14:06:21 +0100 | [diff] [blame] | 863 | if (!get_capacity(sgp) || (sgp->flags & GENHD_FL_HIDDEN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | return 0; |
| 865 | |
Christoph Hellwig | ecc75a9 | 2021-04-06 08:23:00 +0200 | [diff] [blame] | 866 | rcu_read_lock(); |
| 867 | xa_for_each(&sgp->part_tbl, idx, part) { |
| 868 | if (!bdev_nr_sectors(part)) |
| 869 | continue; |
Christoph Hellwig | a291bb43 | 2021-07-27 08:25:15 +0200 | [diff] [blame] | 870 | seq_printf(seqf, "%4d %7d %10llu %pg\n", |
Christoph Hellwig | ad1eaa5 | 2020-11-24 09:52:59 +0100 | [diff] [blame] | 871 | MAJOR(part->bd_dev), MINOR(part->bd_dev), |
Christoph Hellwig | a291bb43 | 2021-07-27 08:25:15 +0200 | [diff] [blame] | 872 | bdev_nr_sectors(part) >> 1, part); |
Christoph Hellwig | ecc75a9 | 2021-04-06 08:23:00 +0200 | [diff] [blame] | 873 | } |
| 874 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | return 0; |
| 876 | } |
| 877 | |
Alexey Dobriyan | f500975 | 2008-10-04 23:53:21 +0400 | [diff] [blame] | 878 | static const struct seq_operations partitions_op = { |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 879 | .start = show_partition_start, |
| 880 | .next = disk_seqf_next, |
| 881 | .stop = disk_seqf_stop, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 882 | .show = show_partition |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | }; |
| 884 | #endif |
| 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | static int __init genhd_device_init(void) |
| 887 | { |
Dan Williams | e105b8b | 2008-04-21 10:51:07 -0700 | [diff] [blame] | 888 | int error; |
| 889 | |
Dan Williams | e105b8b | 2008-04-21 10:51:07 -0700 | [diff] [blame] | 890 | error = class_register(&block_class); |
Roland McGrath | ee27a55 | 2008-03-11 17:13:15 -0700 | [diff] [blame] | 891 | if (unlikely(error)) |
| 892 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | blk_dev_init(); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 894 | |
Zhang, Yanmin | 561ec68 | 2008-11-14 08:26:30 +0100 | [diff] [blame] | 895 | register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
| 896 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 897 | /* create top-level block dir */ |
Greg Kroah-Hartman | 721da5c | 2023-02-23 08:33:26 +0100 | [diff] [blame] | 898 | block_depr = kobject_create_and_add("block", NULL); |
Greg Kroah-Hartman | 830d3cf | 2007-11-06 10:36:58 -0800 | [diff] [blame] | 899 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | } |
| 901 | |
| 902 | subsys_initcall(genhd_device_init); |
| 903 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 904 | static ssize_t disk_range_show(struct device *dev, |
| 905 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 907 | struct gendisk *disk = dev_to_disk(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 909 | return sprintf(buf, "%d\n", disk->minors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | } |
| 911 | |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 912 | static ssize_t disk_ext_range_show(struct device *dev, |
| 913 | struct device_attribute *attr, char *buf) |
| 914 | { |
| 915 | struct gendisk *disk = dev_to_disk(dev); |
| 916 | |
Christoph Hellwig | 1ebe2e5 | 2021-11-22 14:06:22 +0100 | [diff] [blame] | 917 | return sprintf(buf, "%d\n", |
| 918 | (disk->flags & GENHD_FL_NO_PART) ? 1 : DISK_MAX_PARTS); |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 919 | } |
| 920 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 921 | static ssize_t disk_removable_show(struct device *dev, |
| 922 | struct device_attribute *attr, char *buf) |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 923 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 924 | struct gendisk *disk = dev_to_disk(dev); |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 925 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 926 | return sprintf(buf, "%d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 928 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | |
Christoph Hellwig | 8ddcd65 | 2017-11-02 21:29:53 +0300 | [diff] [blame] | 930 | static ssize_t disk_hidden_show(struct device *dev, |
| 931 | struct device_attribute *attr, char *buf) |
| 932 | { |
| 933 | struct gendisk *disk = dev_to_disk(dev); |
| 934 | |
| 935 | return sprintf(buf, "%d\n", |
| 936 | (disk->flags & GENHD_FL_HIDDEN ? 1 : 0)); |
| 937 | } |
| 938 | |
Kay Sievers | 1c9ce52 | 2008-06-13 09:41:00 +0200 | [diff] [blame] | 939 | static ssize_t disk_ro_show(struct device *dev, |
| 940 | struct device_attribute *attr, char *buf) |
| 941 | { |
| 942 | struct gendisk *disk = dev_to_disk(dev); |
| 943 | |
Tejun Heo | b7db995 | 2008-08-25 19:56:10 +0900 | [diff] [blame] | 944 | return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); |
Kay Sievers | 1c9ce52 | 2008-06-13 09:41:00 +0200 | [diff] [blame] | 945 | } |
| 946 | |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 947 | ssize_t part_size_show(struct device *dev, |
| 948 | struct device_attribute *attr, char *buf) |
| 949 | { |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 950 | return sprintf(buf, "%llu\n", bdev_nr_sectors(dev_to_bdev(dev))); |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 951 | } |
| 952 | |
| 953 | ssize_t part_stat_show(struct device *dev, |
| 954 | struct device_attribute *attr, char *buf) |
| 955 | { |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 956 | struct block_device *bdev = dev_to_bdev(dev); |
Pavel Begunkov | ed6cdde | 2021-10-14 15:03:30 +0100 | [diff] [blame] | 957 | struct request_queue *q = bdev_get_queue(bdev); |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 958 | struct disk_stats stat; |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 959 | unsigned int inflight; |
| 960 | |
Christoph Hellwig | b2f609e | 2020-05-13 12:49:33 +0200 | [diff] [blame] | 961 | if (queue_is_mq(q)) |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 962 | inflight = blk_mq_in_flight(q, bdev); |
Christoph Hellwig | b2f609e | 2020-05-13 12:49:33 +0200 | [diff] [blame] | 963 | else |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 964 | inflight = part_in_flight(bdev); |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 965 | |
Zhang Wensheng | 86d7331 | 2022-02-17 14:42:47 +0800 | [diff] [blame] | 966 | if (inflight) { |
| 967 | part_stat_lock(); |
| 968 | update_io_ticks(bdev, jiffies, true); |
| 969 | part_stat_unlock(); |
| 970 | } |
| 971 | part_stat_read_all(bdev, &stat); |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 972 | return sprintf(buf, |
| 973 | "%8lu %8lu %8llu %8u " |
| 974 | "%8lu %8lu %8llu %8u " |
| 975 | "%8u %8u %8u " |
| 976 | "%8lu %8lu %8llu %8u " |
| 977 | "%8lu %8u" |
| 978 | "\n", |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 979 | stat.ios[STAT_READ], |
| 980 | stat.merges[STAT_READ], |
| 981 | (unsigned long long)stat.sectors[STAT_READ], |
| 982 | (unsigned int)div_u64(stat.nsecs[STAT_READ], NSEC_PER_MSEC), |
| 983 | stat.ios[STAT_WRITE], |
| 984 | stat.merges[STAT_WRITE], |
| 985 | (unsigned long long)stat.sectors[STAT_WRITE], |
| 986 | (unsigned int)div_u64(stat.nsecs[STAT_WRITE], NSEC_PER_MSEC), |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 987 | inflight, |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 988 | jiffies_to_msecs(stat.io_ticks), |
Konstantin Khlebnikov | 8cd5b8f | 2020-03-25 16:07:08 +0300 | [diff] [blame] | 989 | (unsigned int)div_u64(stat.nsecs[STAT_READ] + |
| 990 | stat.nsecs[STAT_WRITE] + |
| 991 | stat.nsecs[STAT_DISCARD] + |
| 992 | stat.nsecs[STAT_FLUSH], |
| 993 | NSEC_PER_MSEC), |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 994 | stat.ios[STAT_DISCARD], |
| 995 | stat.merges[STAT_DISCARD], |
| 996 | (unsigned long long)stat.sectors[STAT_DISCARD], |
| 997 | (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], NSEC_PER_MSEC), |
| 998 | stat.ios[STAT_FLUSH], |
| 999 | (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], NSEC_PER_MSEC)); |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 1000 | } |
| 1001 | |
| 1002 | ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, |
| 1003 | char *buf) |
| 1004 | { |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 1005 | struct block_device *bdev = dev_to_bdev(dev); |
Pavel Begunkov | ed6cdde | 2021-10-14 15:03:30 +0100 | [diff] [blame] | 1006 | struct request_queue *q = bdev_get_queue(bdev); |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 1007 | unsigned int inflight[2]; |
| 1008 | |
Christoph Hellwig | b2f609e | 2020-05-13 12:49:33 +0200 | [diff] [blame] | 1009 | if (queue_is_mq(q)) |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 1010 | blk_mq_in_flight_rw(q, bdev, inflight); |
Christoph Hellwig | b2f609e | 2020-05-13 12:49:33 +0200 | [diff] [blame] | 1011 | else |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 1012 | part_in_flight_rw(bdev, inflight); |
Christoph Hellwig | b2f609e | 2020-05-13 12:49:33 +0200 | [diff] [blame] | 1013 | |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 1014 | return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]); |
| 1015 | } |
| 1016 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1017 | static ssize_t disk_capability_show(struct device *dev, |
| 1018 | struct device_attribute *attr, char *buf) |
Kristen Carlson Accardi | 86ce18d | 2007-05-23 13:57:38 -0700 | [diff] [blame] | 1019 | { |
Christoph Hellwig | e81cd5a | 2023-02-03 16:02:09 +0100 | [diff] [blame] | 1020 | dev_warn_once(dev, "the capability attribute has been deprecated.\n"); |
| 1021 | return sprintf(buf, "0\n"); |
Kristen Carlson Accardi | 86ce18d | 2007-05-23 13:57:38 -0700 | [diff] [blame] | 1022 | } |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1023 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1024 | static ssize_t disk_alignment_offset_show(struct device *dev, |
| 1025 | struct device_attribute *attr, |
| 1026 | char *buf) |
| 1027 | { |
| 1028 | struct gendisk *disk = dev_to_disk(dev); |
| 1029 | |
Christoph Hellwig | 640f2a2 | 2022-04-15 06:52:48 +0200 | [diff] [blame] | 1030 | return sprintf(buf, "%d\n", bdev_alignment_offset(disk->part0)); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1031 | } |
| 1032 | |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1033 | static ssize_t disk_discard_alignment_show(struct device *dev, |
| 1034 | struct device_attribute *attr, |
| 1035 | char *buf) |
| 1036 | { |
| 1037 | struct gendisk *disk = dev_to_disk(dev); |
| 1038 | |
Christoph Hellwig | 4e1462f | 2022-04-15 06:52:50 +0200 | [diff] [blame] | 1039 | return sprintf(buf, "%d\n", bdev_alignment_offset(disk->part0)); |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1040 | } |
| 1041 | |
Matteo Croce | 13927b3 | 2021-07-13 01:05:28 +0200 | [diff] [blame] | 1042 | static ssize_t diskseq_show(struct device *dev, |
| 1043 | struct device_attribute *attr, char *buf) |
| 1044 | { |
| 1045 | struct gendisk *disk = dev_to_disk(dev); |
| 1046 | |
| 1047 | return sprintf(buf, "%llu\n", disk->diskseq); |
| 1048 | } |
| 1049 | |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 1050 | static DEVICE_ATTR(range, 0444, disk_range_show, NULL); |
| 1051 | static DEVICE_ATTR(ext_range, 0444, disk_ext_range_show, NULL); |
| 1052 | static DEVICE_ATTR(removable, 0444, disk_removable_show, NULL); |
| 1053 | static DEVICE_ATTR(hidden, 0444, disk_hidden_show, NULL); |
| 1054 | static DEVICE_ATTR(ro, 0444, disk_ro_show, NULL); |
| 1055 | static DEVICE_ATTR(size, 0444, part_size_show, NULL); |
| 1056 | static DEVICE_ATTR(alignment_offset, 0444, disk_alignment_offset_show, NULL); |
| 1057 | static DEVICE_ATTR(discard_alignment, 0444, disk_discard_alignment_show, NULL); |
| 1058 | static DEVICE_ATTR(capability, 0444, disk_capability_show, NULL); |
| 1059 | static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); |
| 1060 | static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); |
| 1061 | static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store); |
Matteo Croce | 13927b3 | 2021-07-13 01:05:28 +0200 | [diff] [blame] | 1062 | static DEVICE_ATTR(diskseq, 0444, diskseq_show, NULL); |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 1063 | |
Akinobu Mita | c17bb49 | 2006-12-08 02:39:46 -0800 | [diff] [blame] | 1064 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 1065 | ssize_t part_fail_show(struct device *dev, |
| 1066 | struct device_attribute *attr, char *buf) |
| 1067 | { |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 1068 | return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_make_it_fail); |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 1069 | } |
| 1070 | |
| 1071 | ssize_t part_fail_store(struct device *dev, |
| 1072 | struct device_attribute *attr, |
| 1073 | const char *buf, size_t count) |
| 1074 | { |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 1075 | int i; |
| 1076 | |
| 1077 | if (count > 0 && sscanf(buf, "%d", &i) > 0) |
Christoph Hellwig | 0d02129 | 2020-11-27 16:43:51 +0100 | [diff] [blame] | 1078 | dev_to_bdev(dev)->bd_make_it_fail = i; |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 1079 | |
| 1080 | return count; |
| 1081 | } |
| 1082 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1083 | static struct device_attribute dev_attr_fail = |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 1084 | __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); |
Christoph Hellwig | 3ad5cee | 2020-03-24 08:25:13 +0100 | [diff] [blame] | 1085 | #endif /* CONFIG_FAIL_MAKE_REQUEST */ |
| 1086 | |
Jens Axboe | 581d4e2 | 2008-09-14 05:56:33 -0700 | [diff] [blame] | 1087 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
| 1088 | static struct device_attribute dev_attr_fail_timeout = |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 1089 | __ATTR(io-timeout-fail, 0644, part_timeout_show, part_timeout_store); |
Jens Axboe | 581d4e2 | 2008-09-14 05:56:33 -0700 | [diff] [blame] | 1090 | #endif |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1091 | |
| 1092 | static struct attribute *disk_attrs[] = { |
| 1093 | &dev_attr_range.attr, |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 1094 | &dev_attr_ext_range.attr, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1095 | &dev_attr_removable.attr, |
Christoph Hellwig | 8ddcd65 | 2017-11-02 21:29:53 +0300 | [diff] [blame] | 1096 | &dev_attr_hidden.attr, |
Kay Sievers | 1c9ce52 | 2008-06-13 09:41:00 +0200 | [diff] [blame] | 1097 | &dev_attr_ro.attr, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1098 | &dev_attr_size.attr, |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1099 | &dev_attr_alignment_offset.attr, |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1100 | &dev_attr_discard_alignment.attr, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1101 | &dev_attr_capability.attr, |
| 1102 | &dev_attr_stat.attr, |
Nikanth Karthikesan | 316d315 | 2009-10-06 20:16:55 +0200 | [diff] [blame] | 1103 | &dev_attr_inflight.attr, |
Vishal Verma | 99e6608 | 2016-01-09 08:36:51 -0800 | [diff] [blame] | 1104 | &dev_attr_badblocks.attr, |
Christoph Hellwig | 2bc8cda | 2021-06-24 09:38:43 +0200 | [diff] [blame] | 1105 | &dev_attr_events.attr, |
| 1106 | &dev_attr_events_async.attr, |
| 1107 | &dev_attr_events_poll_msecs.attr, |
Matteo Croce | 13927b3 | 2021-07-13 01:05:28 +0200 | [diff] [blame] | 1108 | &dev_attr_diskseq.attr, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1109 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
| 1110 | &dev_attr_fail.attr, |
| 1111 | #endif |
Jens Axboe | 581d4e2 | 2008-09-14 05:56:33 -0700 | [diff] [blame] | 1112 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
| 1113 | &dev_attr_fail_timeout.attr, |
| 1114 | #endif |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1115 | NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | }; |
| 1117 | |
Dan Williams | 9438b3e0 | 2017-04-27 14:46:26 -0700 | [diff] [blame] | 1118 | static umode_t disk_visible(struct kobject *kobj, struct attribute *a, int n) |
| 1119 | { |
| 1120 | struct device *dev = container_of(kobj, typeof(*dev), kobj); |
| 1121 | struct gendisk *disk = dev_to_disk(dev); |
| 1122 | |
| 1123 | if (a == &dev_attr_badblocks.attr && !disk->bb) |
| 1124 | return 0; |
| 1125 | return a->mode; |
| 1126 | } |
| 1127 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1128 | static struct attribute_group disk_attr_group = { |
| 1129 | .attrs = disk_attrs, |
Dan Williams | 9438b3e0 | 2017-04-27 14:46:26 -0700 | [diff] [blame] | 1130 | .is_visible = disk_visible, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1131 | }; |
| 1132 | |
David Brownell | a4dbd67 | 2009-06-24 10:06:31 -0700 | [diff] [blame] | 1133 | static const struct attribute_group *disk_attr_groups[] = { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1134 | &disk_attr_group, |
Christoph Hellwig | cc5c516d | 2022-06-28 19:18:45 +0200 | [diff] [blame] | 1135 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
| 1136 | &blk_trace_attr_group, |
| 1137 | #endif |
Thomas Weißschuh | ff53cd5 | 2023-03-18 17:36:25 +0000 | [diff] [blame] | 1138 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
| 1139 | &blk_integrity_attr_group, |
| 1140 | #endif |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1141 | NULL |
| 1142 | }; |
| 1143 | |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 1144 | /** |
Luis Chamberlain | b5bd357 | 2020-06-19 20:47:23 +0000 | [diff] [blame] | 1145 | * disk_release - releases all allocated resources of the gendisk |
| 1146 | * @dev: the device representing this disk |
| 1147 | * |
| 1148 | * This function releases all allocated resources of the gendisk. |
| 1149 | * |
Luis Chamberlain | b5bd357 | 2020-06-19 20:47:23 +0000 | [diff] [blame] | 1150 | * Drivers which used __device_add_disk() have a gendisk with a request_queue |
| 1151 | * assigned. Since the request_queue sits on top of the gendisk for these |
| 1152 | * drivers we also call blk_put_queue() for them, and we expect the |
| 1153 | * request_queue refcount to reach 0 at this point, and so the request_queue |
| 1154 | * will also be freed prior to the disk. |
Luis Chamberlain | e8c7d14 | 2020-06-19 20:47:25 +0000 | [diff] [blame] | 1155 | * |
| 1156 | * Context: can sleep |
Luis Chamberlain | b5bd357 | 2020-06-19 20:47:23 +0000 | [diff] [blame] | 1157 | */ |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1158 | static void disk_release(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1160 | struct gendisk *disk = dev_to_disk(dev); |
| 1161 | |
Luis Chamberlain | e8c7d14 | 2020-06-19 20:47:25 +0000 | [diff] [blame] | 1162 | might_sleep(); |
Christoph Hellwig | a204176 | 2021-10-14 15:02:31 +0200 | [diff] [blame] | 1163 | WARN_ON_ONCE(disk_live(disk)); |
Luis Chamberlain | e8c7d14 | 2020-06-19 20:47:25 +0000 | [diff] [blame] | 1164 | |
Yu Kuai | dd7de37 | 2023-06-10 10:20:03 +0800 | [diff] [blame] | 1165 | blk_trace_remove(disk->queue); |
| 1166 | |
Christoph Hellwig | c5db2cf | 2022-07-20 15:05:41 +0200 | [diff] [blame] | 1167 | /* |
| 1168 | * To undo the all initialization from blk_mq_init_allocated_queue in |
| 1169 | * case of a probe failure where add_disk is never called we have to |
| 1170 | * call blk_mq_exit_queue here. We can't do this for the more common |
| 1171 | * teardown case (yet) as the tagset can be gone by the time the disk |
| 1172 | * is released once it was added. |
| 1173 | */ |
| 1174 | if (queue_is_mq(disk->queue) && |
| 1175 | test_bit(GD_OWNS_QUEUE, &disk->state) && |
| 1176 | !test_bit(GD_ADDED, &disk->state)) |
| 1177 | blk_mq_exit_queue(disk->queue); |
| 1178 | |
Christoph Hellwig | b6553bef | 2023-02-14 19:33:06 +0100 | [diff] [blame] | 1179 | blkcg_exit_disk(disk); |
| 1180 | |
Christoph Hellwig | 46754bd | 2022-07-27 12:22:57 -0400 | [diff] [blame] | 1181 | bioset_exit(&disk->bio_split); |
Ming Lei | 2a19b28 | 2021-11-16 09:43:43 +0800 | [diff] [blame] | 1182 | |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1183 | disk_release_events(disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | kfree(disk->random); |
Christoph Hellwig | 5d40066 | 2022-07-06 09:03:42 +0200 | [diff] [blame] | 1185 | disk_free_zone_bitmaps(disk); |
Christoph Hellwig | a33df75 | 2021-01-24 11:02:41 +0100 | [diff] [blame] | 1186 | xa_destroy(&disk->part_tbl); |
Ming Lei | 1059699 | 2022-03-08 06:51:55 +0100 | [diff] [blame] | 1187 | |
Christoph Hellwig | d152c68 | 2021-08-16 15:46:24 +0200 | [diff] [blame] | 1188 | disk->queue->disk = NULL; |
Christoph Hellwig | 61a35cf | 2021-08-16 15:19:09 +0200 | [diff] [blame] | 1189 | blk_put_queue(disk->queue); |
Christoph Hellwig | 7679205 | 2022-02-15 10:45:10 +0100 | [diff] [blame] | 1190 | |
| 1191 | if (test_bit(GD_ADDED, &disk->state) && disk->fops->free_disk) |
| 1192 | disk->fops->free_disk(disk); |
| 1193 | |
Christoph Hellwig | 2f4731d | 2021-07-22 09:54:02 +0200 | [diff] [blame] | 1194 | iput(disk->part0->bd_inode); /* frees the disk */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | } |
Matteo Croce | 87eb710 | 2021-07-13 01:05:26 +0200 | [diff] [blame] | 1196 | |
Greg Kroah-Hartman | 23680f0 | 2022-11-23 13:25:19 +0100 | [diff] [blame] | 1197 | static int block_uevent(const struct device *dev, struct kobj_uevent_env *env) |
Matteo Croce | 87eb710 | 2021-07-13 01:05:26 +0200 | [diff] [blame] | 1198 | { |
Greg Kroah-Hartman | 23680f0 | 2022-11-23 13:25:19 +0100 | [diff] [blame] | 1199 | const struct gendisk *disk = dev_to_disk(dev); |
Matteo Croce | 87eb710 | 2021-07-13 01:05:26 +0200 | [diff] [blame] | 1200 | |
| 1201 | return add_uevent_var(env, "DISKSEQ=%llu", disk->diskseq); |
| 1202 | } |
| 1203 | |
Ricardo B. Marliere | f8c7511 | 2024-03-05 16:32:16 -0300 | [diff] [blame] | 1204 | const struct class block_class = { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1205 | .name = "block", |
Matteo Croce | 87eb710 | 2021-07-13 01:05:26 +0200 | [diff] [blame] | 1206 | .dev_uevent = block_uevent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | }; |
| 1208 | |
Greg Kroah-Hartman | a9b12f8b | 2023-01-11 12:30:08 +0100 | [diff] [blame] | 1209 | static char *block_devnode(const struct device *dev, umode_t *mode, |
Jens Axboe | 050a4f3 | 2023-01-04 14:44:02 -0700 | [diff] [blame] | 1210 | kuid_t *uid, kgid_t *gid) |
| 1211 | { |
| 1212 | struct gendisk *disk = dev_to_disk(dev); |
| 1213 | |
| 1214 | if (disk->fops->devnode) |
| 1215 | return disk->fops->devnode(disk, mode); |
| 1216 | return NULL; |
| 1217 | } |
| 1218 | |
Boris Burkov | ef45fe4 | 2020-06-01 13:12:05 -0700 | [diff] [blame] | 1219 | const struct device_type disk_type = { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1220 | .name = "disk", |
| 1221 | .groups = disk_attr_groups, |
| 1222 | .release = disk_release, |
Jens Axboe | 050a4f3 | 2023-01-04 14:44:02 -0700 | [diff] [blame] | 1223 | .devnode = block_devnode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | }; |
| 1225 | |
Randy Dunlap | a6e2ba8 | 2008-05-23 09:44:11 -0700 | [diff] [blame] | 1226 | #ifdef CONFIG_PROC_FS |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 1227 | /* |
| 1228 | * aggregate disk stat collector. Uses the same stats that the sysfs |
| 1229 | * entries do, above, but makes them available through one seq_file. |
| 1230 | * |
| 1231 | * The output looks suspiciously like /proc/partitions with a bunch of |
| 1232 | * extra fields. |
| 1233 | */ |
| 1234 | static int diskstats_show(struct seq_file *seqf, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | { |
| 1236 | struct gendisk *gp = v; |
Christoph Hellwig | ad1eaa5 | 2020-11-24 09:52:59 +0100 | [diff] [blame] | 1237 | struct block_device *hd; |
Mikulas Patocka | e016b78 | 2018-12-06 11:41:21 -0500 | [diff] [blame] | 1238 | unsigned int inflight; |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 1239 | struct disk_stats stat; |
Christoph Hellwig | 7fae67c | 2021-04-06 08:23:01 +0200 | [diff] [blame] | 1240 | unsigned long idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | |
| 1242 | /* |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 1243 | if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 1244 | seq_puts(seqf, "major minor name" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | " rio rmerge rsect ruse wio wmerge " |
| 1246 | "wsect wuse running use aveq" |
| 1247 | "\n\n"); |
| 1248 | */ |
Wanlong Gao | 9f5e486 | 2011-06-13 10:45:43 +0200 | [diff] [blame] | 1249 | |
Christoph Hellwig | 7fae67c | 2021-04-06 08:23:01 +0200 | [diff] [blame] | 1250 | rcu_read_lock(); |
| 1251 | xa_for_each(&gp->part_tbl, idx, hd) { |
| 1252 | if (bdev_is_partition(hd) && !bdev_nr_sectors(hd)) |
| 1253 | continue; |
Christoph Hellwig | b2f609e | 2020-05-13 12:49:33 +0200 | [diff] [blame] | 1254 | if (queue_is_mq(gp->queue)) |
Christoph Hellwig | ad1eaa5 | 2020-11-24 09:52:59 +0100 | [diff] [blame] | 1255 | inflight = blk_mq_in_flight(gp->queue, hd); |
Christoph Hellwig | b2f609e | 2020-05-13 12:49:33 +0200 | [diff] [blame] | 1256 | else |
Christoph Hellwig | ad1eaa5 | 2020-11-24 09:52:59 +0100 | [diff] [blame] | 1257 | inflight = part_in_flight(hd); |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 1258 | |
Zhang Wensheng | 86d7331 | 2022-02-17 14:42:47 +0800 | [diff] [blame] | 1259 | if (inflight) { |
| 1260 | part_stat_lock(); |
| 1261 | update_io_ticks(hd, jiffies, true); |
| 1262 | part_stat_unlock(); |
| 1263 | } |
| 1264 | part_stat_read_all(hd, &stat); |
Abd-Alrhman Masalkhi | 26e2d7a | 2021-07-27 08:25:13 +0200 | [diff] [blame] | 1265 | seq_printf(seqf, "%4d %7d %pg " |
Michael Callahan | bdca3c8 | 2018-07-18 04:47:40 -0700 | [diff] [blame] | 1266 | "%lu %lu %lu %u " |
| 1267 | "%lu %lu %lu %u " |
| 1268 | "%u %u %u " |
Konstantin Khlebnikov | b686631 | 2019-11-21 13:40:26 +0300 | [diff] [blame] | 1269 | "%lu %lu %lu %u " |
| 1270 | "%lu %u" |
| 1271 | "\n", |
Abd-Alrhman Masalkhi | 26e2d7a | 2021-07-27 08:25:13 +0200 | [diff] [blame] | 1272 | MAJOR(hd->bd_dev), MINOR(hd->bd_dev), hd, |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 1273 | stat.ios[STAT_READ], |
| 1274 | stat.merges[STAT_READ], |
| 1275 | stat.sectors[STAT_READ], |
| 1276 | (unsigned int)div_u64(stat.nsecs[STAT_READ], |
| 1277 | NSEC_PER_MSEC), |
| 1278 | stat.ios[STAT_WRITE], |
| 1279 | stat.merges[STAT_WRITE], |
| 1280 | stat.sectors[STAT_WRITE], |
| 1281 | (unsigned int)div_u64(stat.nsecs[STAT_WRITE], |
| 1282 | NSEC_PER_MSEC), |
Mikulas Patocka | e016b78 | 2018-12-06 11:41:21 -0500 | [diff] [blame] | 1283 | inflight, |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 1284 | jiffies_to_msecs(stat.io_ticks), |
Konstantin Khlebnikov | 8cd5b8f | 2020-03-25 16:07:08 +0300 | [diff] [blame] | 1285 | (unsigned int)div_u64(stat.nsecs[STAT_READ] + |
| 1286 | stat.nsecs[STAT_WRITE] + |
| 1287 | stat.nsecs[STAT_DISCARD] + |
| 1288 | stat.nsecs[STAT_FLUSH], |
| 1289 | NSEC_PER_MSEC), |
Konstantin Khlebnikov | ea18e0f | 2020-03-25 16:07:06 +0300 | [diff] [blame] | 1290 | stat.ios[STAT_DISCARD], |
| 1291 | stat.merges[STAT_DISCARD], |
| 1292 | stat.sectors[STAT_DISCARD], |
| 1293 | (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], |
| 1294 | NSEC_PER_MSEC), |
| 1295 | stat.ios[STAT_FLUSH], |
| 1296 | (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], |
| 1297 | NSEC_PER_MSEC) |
Jerome Marchand | 28f39d5 | 2008-02-08 11:04:56 +0100 | [diff] [blame] | 1298 | ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | } |
Christoph Hellwig | 7fae67c | 2021-04-06 08:23:01 +0200 | [diff] [blame] | 1300 | rcu_read_unlock(); |
Wanlong Gao | 9f5e486 | 2011-06-13 10:45:43 +0200 | [diff] [blame] | 1301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | return 0; |
| 1303 | } |
| 1304 | |
Alexey Dobriyan | 31d85ab | 2008-10-06 12:55:38 +0400 | [diff] [blame] | 1305 | static const struct seq_operations diskstats_op = { |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 1306 | .start = disk_seqf_start, |
| 1307 | .next = disk_seqf_next, |
| 1308 | .stop = disk_seqf_stop, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | .show = diskstats_show |
| 1310 | }; |
Alexey Dobriyan | f500975 | 2008-10-04 23:53:21 +0400 | [diff] [blame] | 1311 | |
| 1312 | static int __init proc_genhd_init(void) |
| 1313 | { |
Christoph Hellwig | fddda2b | 2018-04-13 19:44:18 +0200 | [diff] [blame] | 1314 | proc_create_seq("diskstats", 0, NULL, &diskstats_op); |
| 1315 | proc_create_seq("partitions", 0, NULL, &partitions_op); |
Alexey Dobriyan | f500975 | 2008-10-04 23:53:21 +0400 | [diff] [blame] | 1316 | return 0; |
| 1317 | } |
| 1318 | module_init(proc_genhd_init); |
Randy Dunlap | a6e2ba8 | 2008-05-23 09:44:11 -0700 | [diff] [blame] | 1319 | #endif /* CONFIG_PROC_FS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | |
Christoph Hellwig | c97d93c | 2021-05-25 08:13:00 +0200 | [diff] [blame] | 1321 | dev_t part_devt(struct gendisk *disk, u8 partno) |
| 1322 | { |
Christoph Hellwig | 0e0ccde | 2021-05-25 08:13:01 +0200 | [diff] [blame] | 1323 | struct block_device *part; |
Christoph Hellwig | c97d93c | 2021-05-25 08:13:00 +0200 | [diff] [blame] | 1324 | dev_t devt = 0; |
| 1325 | |
Christoph Hellwig | 0e0ccde | 2021-05-25 08:13:01 +0200 | [diff] [blame] | 1326 | rcu_read_lock(); |
| 1327 | part = xa_load(&disk->part_tbl, partno); |
| 1328 | if (part) |
Christoph Hellwig | c97d93c | 2021-05-25 08:13:00 +0200 | [diff] [blame] | 1329 | devt = part->bd_dev; |
Christoph Hellwig | 0e0ccde | 2021-05-25 08:13:01 +0200 | [diff] [blame] | 1330 | rcu_read_unlock(); |
Christoph Hellwig | c97d93c | 2021-05-25 08:13:00 +0200 | [diff] [blame] | 1331 | |
| 1332 | return devt; |
| 1333 | } |
| 1334 | |
Christoph Hellwig | 4a1fa41 | 2021-08-16 15:19:08 +0200 | [diff] [blame] | 1335 | struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, |
| 1336 | struct lock_class_key *lkclass) |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 1337 | { |
| 1338 | struct gendisk *disk; |
| 1339 | |
Joe Perches | c1b511e | 2013-08-29 15:21:42 -0700 | [diff] [blame] | 1340 | disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); |
Christoph Hellwig | f93af2a | 2020-08-31 20:02:37 +0200 | [diff] [blame] | 1341 | if (!disk) |
Rafael Mendonca | aa0c680 | 2022-08-11 20:23:37 -0300 | [diff] [blame] | 1342 | return NULL; |
Jens Axboe | 6c23a96 | 2011-01-07 08:43:37 +0100 | [diff] [blame] | 1343 | |
Christoph Hellwig | 46754bd | 2022-07-27 12:22:57 -0400 | [diff] [blame] | 1344 | if (bioset_init(&disk->bio_split, BIO_POOL_SIZE, 0, 0)) |
| 1345 | goto out_free_disk; |
| 1346 | |
Christoph Hellwig | edb0872 | 2021-08-09 16:17:43 +0200 | [diff] [blame] | 1347 | disk->bdi = bdi_alloc(node_id); |
| 1348 | if (!disk->bdi) |
Christoph Hellwig | 46754bd | 2022-07-27 12:22:57 -0400 | [diff] [blame] | 1349 | goto out_free_bioset; |
Christoph Hellwig | edb0872 | 2021-08-09 16:17:43 +0200 | [diff] [blame] | 1350 | |
Pavel Begunkov | 17220ca | 2021-10-14 15:03:26 +0100 | [diff] [blame] | 1351 | /* bdev_alloc() might need the queue, set before the first call */ |
| 1352 | disk->queue = q; |
| 1353 | |
Christoph Hellwig | cb8432d | 2020-11-26 18:47:17 +0100 | [diff] [blame] | 1354 | disk->part0 = bdev_alloc(disk, 0); |
| 1355 | if (!disk->part0) |
Christoph Hellwig | edb0872 | 2021-08-09 16:17:43 +0200 | [diff] [blame] | 1356 | goto out_free_bdi; |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 1357 | |
Christoph Hellwig | f93af2a | 2020-08-31 20:02:37 +0200 | [diff] [blame] | 1358 | disk->node_id = node_id; |
Christoph Hellwig | a869870 | 2021-05-25 08:12:56 +0200 | [diff] [blame] | 1359 | mutex_init(&disk->open_mutex); |
Christoph Hellwig | a33df75 | 2021-01-24 11:02:41 +0100 | [diff] [blame] | 1360 | xa_init(&disk->part_tbl); |
| 1361 | if (xa_insert(&disk->part_tbl, 0, disk->part0, GFP_KERNEL)) |
| 1362 | goto out_destroy_part_tbl; |
Christoph Hellwig | f93af2a | 2020-08-31 20:02:37 +0200 | [diff] [blame] | 1363 | |
Christoph Hellwig | b6553bef | 2023-02-14 19:33:06 +0100 | [diff] [blame] | 1364 | if (blkcg_init_disk(disk)) |
| 1365 | goto out_erase_part0; |
| 1366 | |
Christoph Hellwig | f93af2a | 2020-08-31 20:02:37 +0200 | [diff] [blame] | 1367 | rand_initialize_disk(disk); |
| 1368 | disk_to_dev(disk)->class = &block_class; |
| 1369 | disk_to_dev(disk)->type = &disk_type; |
| 1370 | device_initialize(disk_to_dev(disk)); |
Matteo Croce | cf17994 | 2021-07-13 01:05:25 +0200 | [diff] [blame] | 1371 | inc_diskseq(disk); |
Christoph Hellwig | d152c68 | 2021-08-16 15:46:24 +0200 | [diff] [blame] | 1372 | q->disk = disk; |
Christoph Hellwig | 4dcc4874 | 2021-08-16 15:19:05 +0200 | [diff] [blame] | 1373 | lockdep_init_map(&disk->lockdep_map, "(bio completion)", lkclass, 0); |
Christoph Hellwig | 0dbcfe2 | 2021-08-04 11:41:42 +0200 | [diff] [blame] | 1374 | #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED |
| 1375 | INIT_LIST_HEAD(&disk->slave_bdevs); |
| 1376 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | return disk; |
Christoph Hellwig | f93af2a | 2020-08-31 20:02:37 +0200 | [diff] [blame] | 1378 | |
Christoph Hellwig | b6553bef | 2023-02-14 19:33:06 +0100 | [diff] [blame] | 1379 | out_erase_part0: |
| 1380 | xa_erase(&disk->part_tbl, 0); |
Christoph Hellwig | a33df75 | 2021-01-24 11:02:41 +0100 | [diff] [blame] | 1381 | out_destroy_part_tbl: |
| 1382 | xa_destroy(&disk->part_tbl); |
Tetsuo Handa | 06cc978 | 2021-10-02 18:23:02 +0900 | [diff] [blame] | 1383 | disk->part0->bd_disk = NULL; |
Christoph Hellwig | 2f4731d | 2021-07-22 09:54:02 +0200 | [diff] [blame] | 1384 | iput(disk->part0->bd_inode); |
Christoph Hellwig | edb0872 | 2021-08-09 16:17:43 +0200 | [diff] [blame] | 1385 | out_free_bdi: |
| 1386 | bdi_put(disk->bdi); |
Christoph Hellwig | 46754bd | 2022-07-27 12:22:57 -0400 | [diff] [blame] | 1387 | out_free_bioset: |
| 1388 | bioset_exit(&disk->bio_split); |
Christoph Hellwig | f93af2a | 2020-08-31 20:02:37 +0200 | [diff] [blame] | 1389 | out_free_disk: |
| 1390 | kfree(disk); |
| 1391 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | |
Christoph Hellwig | 74fa8f9 | 2024-02-15 08:10:47 +0100 | [diff] [blame] | 1394 | struct gendisk *__blk_alloc_disk(struct queue_limits *lim, int node, |
| 1395 | struct lock_class_key *lkclass) |
Christoph Hellwig | f525464 | 2021-05-21 07:50:55 +0200 | [diff] [blame] | 1396 | { |
Christoph Hellwig | 74fa8f9 | 2024-02-15 08:10:47 +0100 | [diff] [blame] | 1397 | struct queue_limits default_lim = { }; |
Christoph Hellwig | f525464 | 2021-05-21 07:50:55 +0200 | [diff] [blame] | 1398 | struct request_queue *q; |
| 1399 | struct gendisk *disk; |
| 1400 | |
Christoph Hellwig | 74fa8f9 | 2024-02-15 08:10:47 +0100 | [diff] [blame] | 1401 | q = blk_alloc_queue(lim ? lim : &default_lim, node); |
Christoph Hellwig | ad751ba | 2024-02-13 08:34:18 +0100 | [diff] [blame] | 1402 | if (IS_ERR(q)) |
Christoph Hellwig | 74fa8f9 | 2024-02-15 08:10:47 +0100 | [diff] [blame] | 1403 | return ERR_CAST(q); |
Christoph Hellwig | f525464 | 2021-05-21 07:50:55 +0200 | [diff] [blame] | 1404 | |
Christoph Hellwig | 4a1fa41 | 2021-08-16 15:19:08 +0200 | [diff] [blame] | 1405 | disk = __alloc_disk_node(q, node, lkclass); |
Christoph Hellwig | f525464 | 2021-05-21 07:50:55 +0200 | [diff] [blame] | 1406 | if (!disk) { |
Christoph Hellwig | 6f8191f | 2022-06-19 08:05:51 +0200 | [diff] [blame] | 1407 | blk_put_queue(q); |
Christoph Hellwig | 74fa8f9 | 2024-02-15 08:10:47 +0100 | [diff] [blame] | 1408 | return ERR_PTR(-ENOMEM); |
Christoph Hellwig | f525464 | 2021-05-21 07:50:55 +0200 | [diff] [blame] | 1409 | } |
Christoph Hellwig | 6f8191f | 2022-06-19 08:05:51 +0200 | [diff] [blame] | 1410 | set_bit(GD_OWNS_QUEUE, &disk->state); |
Christoph Hellwig | f525464 | 2021-05-21 07:50:55 +0200 | [diff] [blame] | 1411 | return disk; |
| 1412 | } |
| 1413 | EXPORT_SYMBOL(__blk_alloc_disk); |
| 1414 | |
Luis Chamberlain | b5bd357 | 2020-06-19 20:47:23 +0000 | [diff] [blame] | 1415 | /** |
Luis Chamberlain | b5bd357 | 2020-06-19 20:47:23 +0000 | [diff] [blame] | 1416 | * put_disk - decrements the gendisk refcount |
Randy Dunlap | 0d20dcc | 2020-07-30 18:42:30 -0700 | [diff] [blame] | 1417 | * @disk: the struct gendisk to decrement the refcount for |
Luis Chamberlain | b5bd357 | 2020-06-19 20:47:23 +0000 | [diff] [blame] | 1418 | * |
| 1419 | * This decrements the refcount for the struct gendisk. When this reaches 0 |
| 1420 | * we'll have disk_release() called. |
Luis Chamberlain | e8c7d14 | 2020-06-19 20:47:25 +0000 | [diff] [blame] | 1421 | * |
Christoph Hellwig | c5db2cf | 2022-07-20 15:05:41 +0200 | [diff] [blame] | 1422 | * Note: for blk-mq disk put_disk must be called before freeing the tag_set |
| 1423 | * when handling probe errors (that is before add_disk() is called). |
| 1424 | * |
Luis Chamberlain | e8c7d14 | 2020-06-19 20:47:25 +0000 | [diff] [blame] | 1425 | * Context: Any context, but the last reference must not be dropped from |
| 1426 | * atomic context. |
Luis Chamberlain | b5bd357 | 2020-06-19 20:47:23 +0000 | [diff] [blame] | 1427 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | void put_disk(struct gendisk *disk) |
| 1429 | { |
| 1430 | if (disk) |
Christoph Hellwig | efdc41c | 2020-11-10 07:25:37 +0100 | [diff] [blame] | 1431 | put_device(disk_to_dev(disk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | EXPORT_SYMBOL(put_disk); |
| 1434 | |
Hannes Reinecke | e3264a4 | 2009-07-28 09:13:13 +0200 | [diff] [blame] | 1435 | static void set_disk_ro_uevent(struct gendisk *gd, int ro) |
| 1436 | { |
| 1437 | char event[] = "DISK_RO=1"; |
| 1438 | char *envp[] = { event, NULL }; |
| 1439 | |
| 1440 | if (!ro) |
| 1441 | event[8] = '0'; |
| 1442 | kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); |
| 1443 | } |
| 1444 | |
Christoph Hellwig | 52f019d | 2021-01-09 11:42:51 +0100 | [diff] [blame] | 1445 | /** |
| 1446 | * set_disk_ro - set a gendisk read-only |
| 1447 | * @disk: gendisk to operate on |
Lukas Bulwahn | 7f31bee | 2021-01-29 05:55:05 +0100 | [diff] [blame] | 1448 | * @read_only: %true to set the disk read-only, %false set the disk read/write |
Christoph Hellwig | 52f019d | 2021-01-09 11:42:51 +0100 | [diff] [blame] | 1449 | * |
| 1450 | * This function is used to indicate whether a given disk device should have its |
| 1451 | * read-only flag set. set_disk_ro() is typically used by device drivers to |
| 1452 | * indicate whether the underlying physical device is write-protected. |
| 1453 | */ |
| 1454 | void set_disk_ro(struct gendisk *disk, bool read_only) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | { |
Christoph Hellwig | 52f019d | 2021-01-09 11:42:51 +0100 | [diff] [blame] | 1456 | if (read_only) { |
| 1457 | if (test_and_set_bit(GD_READ_ONLY, &disk->state)) |
| 1458 | return; |
| 1459 | } else { |
| 1460 | if (!test_and_clear_bit(GD_READ_ONLY, &disk->state)) |
| 1461 | return; |
Hannes Reinecke | e3264a4 | 2009-07-28 09:13:13 +0200 | [diff] [blame] | 1462 | } |
Christoph Hellwig | 52f019d | 2021-01-09 11:42:51 +0100 | [diff] [blame] | 1463 | set_disk_ro_uevent(disk, read_only); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | EXPORT_SYMBOL(set_disk_ro); |
| 1466 | |
Matteo Croce | cf17994 | 2021-07-13 01:05:25 +0200 | [diff] [blame] | 1467 | void inc_diskseq(struct gendisk *disk) |
| 1468 | { |
| 1469 | disk->diskseq = atomic64_inc_return(&diskseq); |
| 1470 | } |