Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * This file is released under the GPL. |
| 6 | */ |
| 7 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 8 | #include "dm-core.h" |
| 9 | #include "dm-rq.h" |
Mike Anderson | 51e5b2b | 2007-10-19 22:48:00 +0100 | [diff] [blame] | 10 | #include "dm-uevent.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 14 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/blkpg.h> |
| 16 | #include <linux/bio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/mempool.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/idr.h> |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 20 | #include <linux/hdreg.h> |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 21 | #include <linux/delay.h> |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 22 | #include <linux/wait.h> |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 23 | #include <linux/pr.h> |
Mikulas Patocka | 67246fb | 2017-10-31 19:33:02 -0400 | [diff] [blame] | 24 | #include <linux/vmalloc.h> |
Li Zefan | 5578213 | 2009-06-09 13:43:05 +0800 | [diff] [blame] | 25 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 26 | #define DM_MSG_PREFIX "core" |
| 27 | |
Namhyung Kim | 71a1673 | 2011-10-31 20:18:54 +0000 | [diff] [blame] | 28 | #ifdef CONFIG_PRINTK |
| 29 | /* |
| 30 | * ratelimit state to be used in DMXXX_LIMIT(). |
| 31 | */ |
| 32 | DEFINE_RATELIMIT_STATE(dm_ratelimit_state, |
| 33 | DEFAULT_RATELIMIT_INTERVAL, |
| 34 | DEFAULT_RATELIMIT_BURST); |
| 35 | EXPORT_SYMBOL(dm_ratelimit_state); |
| 36 | #endif |
| 37 | |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 38 | /* |
| 39 | * Cookies are numeric values sent with CHANGE and REMOVE |
| 40 | * uevents while resuming, removing or renaming the device. |
| 41 | */ |
| 42 | #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE" |
| 43 | #define DM_COOKIE_LENGTH 24 |
| 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | static const char *_name = DM_NAME; |
| 46 | |
| 47 | static unsigned int major = 0; |
| 48 | static unsigned int _major = 0; |
| 49 | |
Alasdair G Kergon | d15b774 | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 50 | static DEFINE_IDR(_minor_idr); |
| 51 | |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 52 | static DEFINE_SPINLOCK(_minor_lock); |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 53 | |
| 54 | static void do_deferred_remove(struct work_struct *w); |
| 55 | |
| 56 | static DECLARE_WORK(deferred_remove_work, do_deferred_remove); |
| 57 | |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 58 | static struct workqueue_struct *deferred_remove_workqueue; |
| 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | /* |
| 61 | * One of these is allocated per bio. |
| 62 | */ |
| 63 | struct dm_io { |
| 64 | struct mapped_device *md; |
| 65 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | atomic_t io_count; |
Richard Kennedy | 6ae2fa6 | 2008-07-21 12:00:28 +0100 | [diff] [blame] | 67 | struct bio *bio; |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 68 | unsigned long start_time; |
Kiyoshi Ueda | f88fb98 | 2009-10-16 23:18:15 +0100 | [diff] [blame] | 69 | spinlock_t endio_lock; |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 70 | struct dm_stats_aux stats_aux; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | }; |
| 72 | |
AnilKumar Chimata | 1d07880 | 2017-04-12 15:58:33 -0700 | [diff] [blame] | 73 | union map_info *dm_get_rq_mapinfo(struct request *rq) |
| 74 | { |
| 75 | if (rq && rq->end_io_data) |
| 76 | return &((struct dm_rq_target_io *)rq->end_io_data)->info; |
| 77 | return NULL; |
| 78 | } |
| 79 | |
Jeff Mahoney | ba61fdd | 2006-06-26 00:27:21 -0700 | [diff] [blame] | 80 | #define MINOR_ALLOCED ((void *)-1) |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | /* |
| 83 | * Bits for the md->flags field. |
| 84 | */ |
Alasdair G Kergon | 1eb787e | 2009-04-09 00:27:14 +0100 | [diff] [blame] | 85 | #define DMF_BLOCK_IO_FOR_SUSPEND 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #define DMF_SUSPENDED 1 |
Alasdair G Kergon | aa8d7c2 | 2006-01-06 00:20:06 -0800 | [diff] [blame] | 87 | #define DMF_FROZEN 2 |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 88 | #define DMF_FREEING 3 |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 89 | #define DMF_DELETING 4 |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 90 | #define DMF_NOFLUSH_SUSPENDING 5 |
Kent Overstreet | 8ae1266 | 2015-04-27 23:48:34 -0700 | [diff] [blame] | 91 | #define DMF_DEFERRED_REMOVE 6 |
| 92 | #define DMF_SUSPENDED_INTERNALLY 7 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 94 | #define DM_NUMA_NODE NUMA_NO_NODE |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 95 | static int dm_numa_node = DM_NUMA_NODE; |
Mike Snitzer | faad87d | 2016-01-28 16:52:56 -0500 | [diff] [blame] | 96 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 97 | /* |
| 98 | * For mempools pre-allocation at the table loading time. |
| 99 | */ |
| 100 | struct dm_md_mempools { |
| 101 | mempool_t *io_pool; |
Mike Snitzer | 1ae49ea | 2014-12-05 17:11:05 -0500 | [diff] [blame] | 102 | mempool_t *rq_pool; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 103 | struct bio_set *bs; |
| 104 | }; |
| 105 | |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 106 | struct table_device { |
| 107 | struct list_head list; |
| 108 | atomic_t count; |
| 109 | struct dm_dev dm_dev; |
| 110 | }; |
| 111 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 112 | static struct kmem_cache *_io_cache; |
Kiyoshi Ueda | 8fbf26a | 2009-01-06 03:05:06 +0000 | [diff] [blame] | 113 | static struct kmem_cache *_rq_tio_cache; |
Mike Snitzer | 1ae49ea | 2014-12-05 17:11:05 -0500 | [diff] [blame] | 114 | static struct kmem_cache *_rq_cache; |
Kent Overstreet | 9481874 | 2012-09-07 13:44:01 -0700 | [diff] [blame] | 115 | |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 116 | /* |
Mike Snitzer | e860313 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 117 | * Bio-based DM's mempools' reserved IOs set by the user. |
| 118 | */ |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 119 | #define RESERVED_BIO_BASED_IOS 16 |
Mike Snitzer | e860313 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 120 | static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS; |
| 121 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 122 | static int __dm_get_module_param_int(int *module_param, int min, int max) |
| 123 | { |
| 124 | int param = ACCESS_ONCE(*module_param); |
| 125 | int modified_param = 0; |
| 126 | bool modified = true; |
| 127 | |
| 128 | if (param < min) |
| 129 | modified_param = min; |
| 130 | else if (param > max) |
| 131 | modified_param = max; |
| 132 | else |
| 133 | modified = false; |
| 134 | |
| 135 | if (modified) { |
| 136 | (void)cmpxchg(module_param, param, modified_param); |
| 137 | param = modified_param; |
| 138 | } |
| 139 | |
| 140 | return param; |
| 141 | } |
| 142 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 143 | unsigned __dm_get_module_param(unsigned *module_param, |
| 144 | unsigned def, unsigned max) |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 145 | { |
Mike Snitzer | 09c2d53 | 2015-02-27 22:25:26 -0500 | [diff] [blame] | 146 | unsigned param = ACCESS_ONCE(*module_param); |
| 147 | unsigned modified_param = 0; |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 148 | |
Mike Snitzer | 09c2d53 | 2015-02-27 22:25:26 -0500 | [diff] [blame] | 149 | if (!param) |
| 150 | modified_param = def; |
| 151 | else if (param > max) |
| 152 | modified_param = max; |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 153 | |
Mike Snitzer | 09c2d53 | 2015-02-27 22:25:26 -0500 | [diff] [blame] | 154 | if (modified_param) { |
| 155 | (void)cmpxchg(module_param, param, modified_param); |
| 156 | param = modified_param; |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 157 | } |
| 158 | |
Mike Snitzer | 09c2d53 | 2015-02-27 22:25:26 -0500 | [diff] [blame] | 159 | return param; |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 160 | } |
| 161 | |
Mike Snitzer | e860313 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 162 | unsigned dm_get_reserved_bio_based_ios(void) |
| 163 | { |
Mike Snitzer | 09c2d53 | 2015-02-27 22:25:26 -0500 | [diff] [blame] | 164 | return __dm_get_module_param(&reserved_bio_based_ios, |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 165 | RESERVED_BIO_BASED_IOS, DM_RESERVED_MAX_IOS); |
Mike Snitzer | e860313 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 166 | } |
| 167 | EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios); |
| 168 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 169 | static unsigned dm_get_numa_node(void) |
| 170 | { |
| 171 | return __dm_get_module_param_int(&dm_numa_node, |
| 172 | DM_NUMA_NODE, num_online_nodes() - 1); |
| 173 | } |
| 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | static int __init local_init(void) |
| 176 | { |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 177 | int r = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | /* allocate a slab for the dm_ios */ |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 180 | _io_cache = KMEM_CACHE(dm_io, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | if (!_io_cache) |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 182 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
Kiyoshi Ueda | 8fbf26a | 2009-01-06 03:05:06 +0000 | [diff] [blame] | 184 | _rq_tio_cache = KMEM_CACHE(dm_rq_target_io, 0); |
| 185 | if (!_rq_tio_cache) |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 186 | goto out_free_io_cache; |
Kiyoshi Ueda | 8fbf26a | 2009-01-06 03:05:06 +0000 | [diff] [blame] | 187 | |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 188 | _rq_cache = kmem_cache_create("dm_old_clone_request", sizeof(struct request), |
Mike Snitzer | 1ae49ea | 2014-12-05 17:11:05 -0500 | [diff] [blame] | 189 | __alignof__(struct request), 0, NULL); |
| 190 | if (!_rq_cache) |
| 191 | goto out_free_rq_tio_cache; |
| 192 | |
Mike Anderson | 51e5b2b | 2007-10-19 22:48:00 +0100 | [diff] [blame] | 193 | r = dm_uevent_init(); |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 194 | if (r) |
Mike Snitzer | 1ae49ea | 2014-12-05 17:11:05 -0500 | [diff] [blame] | 195 | goto out_free_rq_cache; |
Mike Anderson | 51e5b2b | 2007-10-19 22:48:00 +0100 | [diff] [blame] | 196 | |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 197 | deferred_remove_workqueue = alloc_workqueue("kdmremove", WQ_UNBOUND, 1); |
| 198 | if (!deferred_remove_workqueue) { |
| 199 | r = -ENOMEM; |
| 200 | goto out_uevent_exit; |
| 201 | } |
| 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | _major = major; |
| 204 | r = register_blkdev(_major, _name); |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 205 | if (r < 0) |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 206 | goto out_free_workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
| 208 | if (!_major) |
| 209 | _major = r; |
| 210 | |
| 211 | return 0; |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 212 | |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 213 | out_free_workqueue: |
| 214 | destroy_workqueue(deferred_remove_workqueue); |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 215 | out_uevent_exit: |
| 216 | dm_uevent_exit(); |
Mike Snitzer | 1ae49ea | 2014-12-05 17:11:05 -0500 | [diff] [blame] | 217 | out_free_rq_cache: |
| 218 | kmem_cache_destroy(_rq_cache); |
Kiyoshi Ueda | 8fbf26a | 2009-01-06 03:05:06 +0000 | [diff] [blame] | 219 | out_free_rq_tio_cache: |
| 220 | kmem_cache_destroy(_rq_tio_cache); |
Kiyoshi Ueda | 51157b4 | 2008-10-21 17:45:08 +0100 | [diff] [blame] | 221 | out_free_io_cache: |
| 222 | kmem_cache_destroy(_io_cache); |
| 223 | |
| 224 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | static void local_exit(void) |
| 228 | { |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 229 | flush_scheduled_work(); |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 230 | destroy_workqueue(deferred_remove_workqueue); |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 231 | |
Mike Snitzer | 1ae49ea | 2014-12-05 17:11:05 -0500 | [diff] [blame] | 232 | kmem_cache_destroy(_rq_cache); |
Kiyoshi Ueda | 8fbf26a | 2009-01-06 03:05:06 +0000 | [diff] [blame] | 233 | kmem_cache_destroy(_rq_tio_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | kmem_cache_destroy(_io_cache); |
Akinobu Mita | 00d5940 | 2007-07-17 04:03:46 -0700 | [diff] [blame] | 235 | unregister_blkdev(_major, _name); |
Mike Anderson | 51e5b2b | 2007-10-19 22:48:00 +0100 | [diff] [blame] | 236 | dm_uevent_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | _major = 0; |
| 239 | |
| 240 | DMINFO("cleaned up"); |
| 241 | } |
| 242 | |
Alasdair G Kergon | b9249e5 | 2008-02-08 02:09:51 +0000 | [diff] [blame] | 243 | static int (*_inits[])(void) __initdata = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | local_init, |
| 245 | dm_target_init, |
| 246 | dm_linear_init, |
| 247 | dm_stripe_init, |
Mikulas Patocka | 952b355 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 248 | dm_io_init, |
Mikulas Patocka | 945fa4d | 2008-04-24 21:43:49 +0100 | [diff] [blame] | 249 | dm_kcopyd_init, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | dm_interface_init, |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 251 | dm_statistics_init, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | }; |
| 253 | |
Alasdair G Kergon | b9249e5 | 2008-02-08 02:09:51 +0000 | [diff] [blame] | 254 | static void (*_exits[])(void) = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | local_exit, |
| 256 | dm_target_exit, |
| 257 | dm_linear_exit, |
| 258 | dm_stripe_exit, |
Mikulas Patocka | 952b355 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 259 | dm_io_exit, |
Mikulas Patocka | 945fa4d | 2008-04-24 21:43:49 +0100 | [diff] [blame] | 260 | dm_kcopyd_exit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | dm_interface_exit, |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 262 | dm_statistics_exit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | }; |
| 264 | |
| 265 | static int __init dm_init(void) |
| 266 | { |
| 267 | const int count = ARRAY_SIZE(_inits); |
| 268 | |
| 269 | int r, i; |
| 270 | |
| 271 | for (i = 0; i < count; i++) { |
| 272 | r = _inits[i](); |
| 273 | if (r) |
| 274 | goto bad; |
| 275 | } |
| 276 | |
| 277 | return 0; |
| 278 | |
| 279 | bad: |
| 280 | while (i--) |
| 281 | _exits[i](); |
| 282 | |
| 283 | return r; |
| 284 | } |
| 285 | |
| 286 | static void __exit dm_exit(void) |
| 287 | { |
| 288 | int i = ARRAY_SIZE(_exits); |
| 289 | |
| 290 | while (i--) |
| 291 | _exits[i](); |
Alasdair G Kergon | d15b774 | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 292 | |
| 293 | /* |
| 294 | * Should be empty by this point. |
| 295 | */ |
Alasdair G Kergon | d15b774 | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 296 | idr_destroy(&_minor_idr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Block device functions |
| 301 | */ |
Mike Anderson | 432a212 | 2009-12-10 23:52:20 +0000 | [diff] [blame] | 302 | int dm_deleting_md(struct mapped_device *md) |
| 303 | { |
| 304 | return test_bit(DMF_DELETING, &md->flags); |
| 305 | } |
| 306 | |
Al Viro | fe5f9f2 | 2008-03-02 10:29:31 -0500 | [diff] [blame] | 307 | static int dm_blk_open(struct block_device *bdev, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | { |
| 309 | struct mapped_device *md; |
| 310 | |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 311 | spin_lock(&_minor_lock); |
| 312 | |
Al Viro | fe5f9f2 | 2008-03-02 10:29:31 -0500 | [diff] [blame] | 313 | md = bdev->bd_disk->private_data; |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 314 | if (!md) |
| 315 | goto out; |
| 316 | |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 317 | if (test_bit(DMF_FREEING, &md->flags) || |
Mike Anderson | 432a212 | 2009-12-10 23:52:20 +0000 | [diff] [blame] | 318 | dm_deleting_md(md)) { |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 319 | md = NULL; |
| 320 | goto out; |
| 321 | } |
| 322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | dm_get(md); |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 324 | atomic_inc(&md->open_count); |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 325 | out: |
| 326 | spin_unlock(&_minor_lock); |
| 327 | |
| 328 | return md ? 0 : -ENXIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | } |
| 330 | |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 331 | static void dm_blk_close(struct gendisk *disk, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | { |
Mike Snitzer | 63a4f06 | 2015-03-23 17:01:43 -0400 | [diff] [blame] | 333 | struct mapped_device *md; |
Arnd Bergmann | 6e9624b | 2010-08-07 18:25:34 +0200 | [diff] [blame] | 334 | |
Milan Broz | 4a1aeb9 | 2011-01-13 19:59:48 +0000 | [diff] [blame] | 335 | spin_lock(&_minor_lock); |
| 336 | |
Mike Snitzer | 63a4f06 | 2015-03-23 17:01:43 -0400 | [diff] [blame] | 337 | md = disk->private_data; |
| 338 | if (WARN_ON(!md)) |
| 339 | goto out; |
| 340 | |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 341 | if (atomic_dec_and_test(&md->open_count) && |
| 342 | (test_bit(DMF_DEFERRED_REMOVE, &md->flags))) |
Mikulas Patocka | acfe0ad | 2014-06-14 13:44:31 -0400 | [diff] [blame] | 343 | queue_work(deferred_remove_workqueue, &deferred_remove_work); |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | dm_put(md); |
Mike Snitzer | 63a4f06 | 2015-03-23 17:01:43 -0400 | [diff] [blame] | 346 | out: |
Milan Broz | 4a1aeb9 | 2011-01-13 19:59:48 +0000 | [diff] [blame] | 347 | spin_unlock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | } |
| 349 | |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 350 | int dm_open_count(struct mapped_device *md) |
| 351 | { |
| 352 | return atomic_read(&md->open_count); |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * Guarantees nothing is using the device before it's deleted. |
| 357 | */ |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 358 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred) |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 359 | { |
| 360 | int r = 0; |
| 361 | |
| 362 | spin_lock(&_minor_lock); |
| 363 | |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 364 | if (dm_open_count(md)) { |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 365 | r = -EBUSY; |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 366 | if (mark_deferred) |
| 367 | set_bit(DMF_DEFERRED_REMOVE, &md->flags); |
| 368 | } else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags)) |
| 369 | r = -EEXIST; |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 370 | else |
| 371 | set_bit(DMF_DELETING, &md->flags); |
| 372 | |
| 373 | spin_unlock(&_minor_lock); |
| 374 | |
| 375 | return r; |
| 376 | } |
| 377 | |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 378 | int dm_cancel_deferred_remove(struct mapped_device *md) |
| 379 | { |
| 380 | int r = 0; |
| 381 | |
| 382 | spin_lock(&_minor_lock); |
| 383 | |
| 384 | if (test_bit(DMF_DELETING, &md->flags)) |
| 385 | r = -EBUSY; |
| 386 | else |
| 387 | clear_bit(DMF_DEFERRED_REMOVE, &md->flags); |
| 388 | |
| 389 | spin_unlock(&_minor_lock); |
| 390 | |
| 391 | return r; |
| 392 | } |
| 393 | |
| 394 | static void do_deferred_remove(struct work_struct *w) |
| 395 | { |
| 396 | dm_deferred_remove(); |
| 397 | } |
| 398 | |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 399 | sector_t dm_get_size(struct mapped_device *md) |
| 400 | { |
| 401 | return get_capacity(md->disk); |
| 402 | } |
| 403 | |
Mike Snitzer | 9974fa2 | 2014-02-28 15:33:43 +0100 | [diff] [blame] | 404 | struct request_queue *dm_get_md_queue(struct mapped_device *md) |
| 405 | { |
| 406 | return md->queue; |
| 407 | } |
| 408 | |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 409 | struct dm_stats *dm_get_stats(struct mapped_device *md) |
| 410 | { |
| 411 | return &md->stats; |
| 412 | } |
| 413 | |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 414 | static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| 415 | { |
| 416 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 417 | |
| 418 | return dm_get_geometry(md, geo); |
| 419 | } |
| 420 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 421 | static int dm_grab_bdev_for_ioctl(struct mapped_device *md, |
| 422 | struct block_device **bdev, |
| 423 | fmode_t *mode) |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 424 | { |
Mike Snitzer | 6648202 | 2016-02-18 15:44:39 -0500 | [diff] [blame] | 425 | struct dm_target *tgt; |
Hannes Reinecke | 6c182cd | 2013-07-10 23:41:15 +0100 | [diff] [blame] | 426 | struct dm_table *map; |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 427 | int srcu_idx, r; |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 428 | |
Hannes Reinecke | 6c182cd | 2013-07-10 23:41:15 +0100 | [diff] [blame] | 429 | retry: |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 430 | r = -ENOTTY; |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 431 | map = dm_get_live_table(md, &srcu_idx); |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 432 | if (!map || !dm_table_get_size(map)) |
| 433 | goto out; |
| 434 | |
| 435 | /* We only support devices that have a single target */ |
| 436 | if (dm_table_get_num_targets(map) != 1) |
| 437 | goto out; |
| 438 | |
Mike Snitzer | 6648202 | 2016-02-18 15:44:39 -0500 | [diff] [blame] | 439 | tgt = dm_table_get_target(map, 0); |
| 440 | if (!tgt->type->prepare_ioctl) |
Mike Snitzer | 4d341d8 | 2014-11-16 14:21:47 -0500 | [diff] [blame] | 441 | goto out; |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 442 | |
Kiyoshi Ueda | 4f186f8 | 2009-12-10 23:52:26 +0000 | [diff] [blame] | 443 | if (dm_suspended_md(md)) { |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 444 | r = -EAGAIN; |
| 445 | goto out; |
| 446 | } |
| 447 | |
Mike Snitzer | 6648202 | 2016-02-18 15:44:39 -0500 | [diff] [blame] | 448 | r = tgt->type->prepare_ioctl(tgt, bdev, mode); |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 449 | if (r < 0) |
| 450 | goto out; |
| 451 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 452 | bdgrab(*bdev); |
| 453 | dm_put_live_table(md, srcu_idx); |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 454 | return r; |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 455 | |
| 456 | out: |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 457 | dm_put_live_table(md, srcu_idx); |
Junichi Nomura | 5bbbfdf | 2015-11-17 09:39:26 +0000 | [diff] [blame] | 458 | if (r == -ENOTCONN && !fatal_signal_pending(current)) { |
Hannes Reinecke | 6c182cd | 2013-07-10 23:41:15 +0100 | [diff] [blame] | 459 | msleep(10); |
| 460 | goto retry; |
| 461 | } |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 462 | return r; |
| 463 | } |
Hannes Reinecke | 6c182cd | 2013-07-10 23:41:15 +0100 | [diff] [blame] | 464 | |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 465 | static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode, |
| 466 | unsigned int cmd, unsigned long arg) |
| 467 | { |
| 468 | struct mapped_device *md = bdev->bd_disk->private_data; |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 469 | int r; |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 470 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 471 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 472 | if (r < 0) |
| 473 | return r; |
| 474 | |
| 475 | if (r > 0) { |
| 476 | /* |
| 477 | * Target determined this ioctl is being issued against |
| 478 | * a logical partition of the parent bdev; so extra |
| 479 | * validation is needed. |
| 480 | */ |
| 481 | r = scsi_verify_blk_ioctl(NULL, cmd); |
| 482 | if (r) |
| 483 | goto out; |
| 484 | } |
| 485 | |
Mike Snitzer | 6648202 | 2016-02-18 15:44:39 -0500 | [diff] [blame] | 486 | r = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
Christoph Hellwig | e56f81e | 2015-10-15 14:10:50 +0200 | [diff] [blame] | 487 | out: |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 488 | bdput(bdev); |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 489 | return r; |
| 490 | } |
| 491 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 492 | static struct dm_io *alloc_io(struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | { |
| 494 | return mempool_alloc(md->io_pool, GFP_NOIO); |
| 495 | } |
| 496 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 497 | static void free_io(struct mapped_device *md, struct dm_io *io) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | { |
| 499 | mempool_free(io, md->io_pool); |
| 500 | } |
| 501 | |
Mike Snitzer | cfae752 | 2016-04-11 12:05:38 -0400 | [diff] [blame] | 502 | static void free_tio(struct dm_target_io *tio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | { |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 504 | bio_put(&tio->clone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
| 506 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 507 | int md_in_flight(struct mapped_device *md) |
Kiyoshi Ueda | 90abb8c | 2009-12-10 23:52:13 +0000 | [diff] [blame] | 508 | { |
| 509 | return atomic_read(&md->pending[READ]) + |
| 510 | atomic_read(&md->pending[WRITE]); |
| 511 | } |
| 512 | |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 513 | static void start_io_acct(struct dm_io *io) |
| 514 | { |
| 515 | struct mapped_device *md = io->md; |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 516 | struct bio *bio = io->bio; |
Tejun Heo | c995905 | 2008-08-25 19:47:21 +0900 | [diff] [blame] | 517 | int cpu; |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 518 | int rw = bio_data_dir(bio); |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 519 | |
| 520 | io->start_time = jiffies; |
| 521 | |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 522 | cpu = part_stat_lock(); |
| 523 | part_round_stats(cpu, &dm_disk(md)->part0); |
| 524 | part_stat_unlock(); |
Shaohua Li | 1e9bb88 | 2011-03-22 08:35:35 +0100 | [diff] [blame] | 525 | atomic_set(&dm_disk(md)->part0.in_flight[rw], |
| 526 | atomic_inc_return(&md->pending[rw])); |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 527 | |
| 528 | if (unlikely(dm_stats_used(&md->stats))) |
Mike Christie | 528ec5a | 2016-06-05 14:32:03 -0500 | [diff] [blame] | 529 | dm_stats_account_io(&md->stats, bio_data_dir(bio), |
| 530 | bio->bi_iter.bi_sector, bio_sectors(bio), |
| 531 | false, 0, &io->stats_aux); |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 532 | } |
| 533 | |
Mikulas Patocka | d221d2e | 2008-11-13 23:39:10 +0000 | [diff] [blame] | 534 | static void end_io_acct(struct dm_io *io) |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 535 | { |
| 536 | struct mapped_device *md = io->md; |
| 537 | struct bio *bio = io->bio; |
| 538 | unsigned long duration = jiffies - io->start_time; |
Gu Zheng | 18c0b22 | 2014-11-24 11:05:26 +0800 | [diff] [blame] | 539 | int pending; |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 540 | int rw = bio_data_dir(bio); |
| 541 | |
Gu Zheng | 18c0b22 | 2014-11-24 11:05:26 +0800 | [diff] [blame] | 542 | generic_end_io_acct(rw, &dm_disk(md)->part0, io->start_time); |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 543 | |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 544 | if (unlikely(dm_stats_used(&md->stats))) |
Mike Christie | 528ec5a | 2016-06-05 14:32:03 -0500 | [diff] [blame] | 545 | dm_stats_account_io(&md->stats, bio_data_dir(bio), |
| 546 | bio->bi_iter.bi_sector, bio_sectors(bio), |
| 547 | true, duration, &io->stats_aux); |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 548 | |
Mikulas Patocka | af7e466 | 2009-04-09 00:27:16 +0100 | [diff] [blame] | 549 | /* |
| 550 | * After this is decremented the bio must not be touched if it is |
Tejun Heo | d87f4c1 | 2010-09-03 11:56:19 +0200 | [diff] [blame] | 551 | * a flush. |
Mikulas Patocka | af7e466 | 2009-04-09 00:27:16 +0100 | [diff] [blame] | 552 | */ |
Shaohua Li | 1e9bb88 | 2011-03-22 08:35:35 +0100 | [diff] [blame] | 553 | pending = atomic_dec_return(&md->pending[rw]); |
| 554 | atomic_set(&dm_disk(md)->part0.in_flight[rw], pending); |
Nikanth Karthikesan | 316d315 | 2009-10-06 20:16:55 +0200 | [diff] [blame] | 555 | pending += atomic_read(&md->pending[rw^0x1]); |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 556 | |
Mikulas Patocka | d221d2e | 2008-11-13 23:39:10 +0000 | [diff] [blame] | 557 | /* nudge anyone waiting on suspend queue */ |
| 558 | if (!pending) |
| 559 | wake_up(&md->wait); |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 560 | } |
| 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | /* |
| 563 | * Add the bio to the list of deferred io. |
| 564 | */ |
Mikulas Patocka | 92c6390 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 565 | static void queue_io(struct mapped_device *md, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | { |
Kiyoshi Ueda | 05447420 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 567 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Kiyoshi Ueda | 05447420 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 569 | spin_lock_irqsave(&md->deferred_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | bio_list_add(&md->deferred, bio); |
Kiyoshi Ueda | 05447420 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 571 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 572 | queue_work(md->wq, &md->work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | /* |
| 576 | * Everyone (including functions in this file), should use this |
| 577 | * function to access the md->map field, and make sure they call |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 578 | * dm_put_live_table() when finished. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | */ |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 580 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | { |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 582 | *srcu_idx = srcu_read_lock(&md->io_barrier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 584 | return srcu_dereference(md->map, &md->io_barrier); |
| 585 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 587 | void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier) |
| 588 | { |
| 589 | srcu_read_unlock(&md->io_barrier, srcu_idx); |
| 590 | } |
| 591 | |
| 592 | void dm_sync_table(struct mapped_device *md) |
| 593 | { |
| 594 | synchronize_srcu(&md->io_barrier); |
| 595 | synchronize_rcu_expedited(); |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * A fast alternative to dm_get_live_table/dm_put_live_table. |
| 600 | * The caller must not block between these two functions. |
| 601 | */ |
| 602 | static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU) |
| 603 | { |
| 604 | rcu_read_lock(); |
| 605 | return rcu_dereference(md->map); |
| 606 | } |
| 607 | |
| 608 | static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) |
| 609 | { |
| 610 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | } |
| 612 | |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 613 | /* |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 614 | * Open a table device so we can use it as a map destination. |
| 615 | */ |
| 616 | static int open_table_device(struct table_device *td, dev_t dev, |
| 617 | struct mapped_device *md) |
| 618 | { |
| 619 | static char *_claim_ptr = "I belong to device-mapper"; |
| 620 | struct block_device *bdev; |
| 621 | |
| 622 | int r; |
| 623 | |
| 624 | BUG_ON(td->dm_dev.bdev); |
| 625 | |
| 626 | bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _claim_ptr); |
| 627 | if (IS_ERR(bdev)) |
| 628 | return PTR_ERR(bdev); |
| 629 | |
| 630 | r = bd_link_disk_holder(bdev, dm_disk(md)); |
| 631 | if (r) { |
| 632 | blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL); |
| 633 | return r; |
| 634 | } |
| 635 | |
| 636 | td->dm_dev.bdev = bdev; |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | /* |
| 641 | * Close a table device that we've been using. |
| 642 | */ |
| 643 | static void close_table_device(struct table_device *td, struct mapped_device *md) |
| 644 | { |
| 645 | if (!td->dm_dev.bdev) |
| 646 | return; |
| 647 | |
| 648 | bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); |
| 649 | blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); |
| 650 | td->dm_dev.bdev = NULL; |
| 651 | } |
| 652 | |
| 653 | static struct table_device *find_table_device(struct list_head *l, dev_t dev, |
| 654 | fmode_t mode) { |
| 655 | struct table_device *td; |
| 656 | |
| 657 | list_for_each_entry(td, l, list) |
| 658 | if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode) |
| 659 | return td; |
| 660 | |
| 661 | return NULL; |
| 662 | } |
| 663 | |
| 664 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, |
| 665 | struct dm_dev **result) { |
| 666 | int r; |
| 667 | struct table_device *td; |
| 668 | |
| 669 | mutex_lock(&md->table_devices_lock); |
| 670 | td = find_table_device(&md->table_devices, dev, mode); |
| 671 | if (!td) { |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 672 | td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 673 | if (!td) { |
| 674 | mutex_unlock(&md->table_devices_lock); |
| 675 | return -ENOMEM; |
| 676 | } |
| 677 | |
| 678 | td->dm_dev.mode = mode; |
| 679 | td->dm_dev.bdev = NULL; |
| 680 | |
| 681 | if ((r = open_table_device(td, dev, md))) { |
| 682 | mutex_unlock(&md->table_devices_lock); |
| 683 | kfree(td); |
| 684 | return r; |
| 685 | } |
| 686 | |
| 687 | format_dev_t(td->dm_dev.name, dev); |
| 688 | |
| 689 | atomic_set(&td->count, 0); |
| 690 | list_add(&td->list, &md->table_devices); |
| 691 | } |
| 692 | atomic_inc(&td->count); |
| 693 | mutex_unlock(&md->table_devices_lock); |
| 694 | |
| 695 | *result = &td->dm_dev; |
| 696 | return 0; |
| 697 | } |
| 698 | EXPORT_SYMBOL_GPL(dm_get_table_device); |
| 699 | |
| 700 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) |
| 701 | { |
| 702 | struct table_device *td = container_of(d, struct table_device, dm_dev); |
| 703 | |
| 704 | mutex_lock(&md->table_devices_lock); |
| 705 | if (atomic_dec_and_test(&td->count)) { |
| 706 | close_table_device(td, md); |
| 707 | list_del(&td->list); |
| 708 | kfree(td); |
| 709 | } |
| 710 | mutex_unlock(&md->table_devices_lock); |
| 711 | } |
| 712 | EXPORT_SYMBOL(dm_put_table_device); |
| 713 | |
| 714 | static void free_table_devices(struct list_head *devices) |
| 715 | { |
| 716 | struct list_head *tmp, *next; |
| 717 | |
| 718 | list_for_each_safe(tmp, next, devices) { |
| 719 | struct table_device *td = list_entry(tmp, struct table_device, list); |
| 720 | |
| 721 | DMWARN("dm_destroy: %s still exists with %d references", |
| 722 | td->dm_dev.name, atomic_read(&td->count)); |
| 723 | kfree(td); |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | /* |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 728 | * Get the geometry associated with a dm device |
| 729 | */ |
| 730 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) |
| 731 | { |
| 732 | *geo = md->geometry; |
| 733 | |
| 734 | return 0; |
| 735 | } |
| 736 | |
| 737 | /* |
| 738 | * Set the geometry of a device. |
| 739 | */ |
| 740 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) |
| 741 | { |
| 742 | sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; |
| 743 | |
| 744 | if (geo->start > sz) { |
| 745 | DMWARN("Start sector is beyond the geometry limits."); |
| 746 | return -EINVAL; |
| 747 | } |
| 748 | |
| 749 | md->geometry = *geo; |
| 750 | |
| 751 | return 0; |
| 752 | } |
| 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | /*----------------------------------------------------------------- |
| 755 | * CRUD START: |
| 756 | * A more elegant soln is in the works that uses the queue |
| 757 | * merge fn, unfortunately there are a couple of changes to |
| 758 | * the block layer that I want to make for this. So in the |
| 759 | * interests of getting something for people to use I give |
| 760 | * you this clearly demarcated crap. |
| 761 | *---------------------------------------------------------------*/ |
| 762 | |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 763 | static int __noflush_suspending(struct mapped_device *md) |
| 764 | { |
| 765 | return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
| 766 | } |
| 767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | /* |
| 769 | * Decrements the number of outstanding ios that a bio has been |
| 770 | * cloned into, completing the original io if necc. |
| 771 | */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 772 | static void dec_pending(struct dm_io *io, int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | { |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 774 | unsigned long flags; |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 775 | int io_error; |
| 776 | struct bio *bio; |
| 777 | struct mapped_device *md = io->md; |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 778 | |
| 779 | /* Push-back supersedes any I/O errors */ |
Kiyoshi Ueda | f88fb98 | 2009-10-16 23:18:15 +0100 | [diff] [blame] | 780 | if (unlikely(error)) { |
| 781 | spin_lock_irqsave(&io->endio_lock, flags); |
| 782 | if (!(io->error > 0 && __noflush_suspending(md))) |
| 783 | io->error = error; |
| 784 | spin_unlock_irqrestore(&io->endio_lock, flags); |
| 785 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
| 787 | if (atomic_dec_and_test(&io->io_count)) { |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 788 | if (io->error == DM_ENDIO_REQUEUE) { |
| 789 | /* |
| 790 | * Target requested pushing back the I/O. |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 791 | */ |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 792 | spin_lock_irqsave(&md->deferred_lock, flags); |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 793 | if (__noflush_suspending(md)) |
| 794 | bio_list_add_head(&md->deferred, io->bio); |
| 795 | else |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 796 | /* noflush suspend was interrupted. */ |
| 797 | io->error = -EIO; |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 798 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 799 | } |
| 800 | |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 801 | io_error = io->error; |
| 802 | bio = io->bio; |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 803 | end_io_acct(io); |
| 804 | free_io(md, io); |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 805 | |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 806 | if (io_error == DM_ENDIO_REQUEUE) |
| 807 | return; |
| 808 | |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 809 | if ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size) { |
Mikulas Patocka | af7e466 | 2009-04-09 00:27:16 +0100 | [diff] [blame] | 810 | /* |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 811 | * Preflush done for flush with data, reissue |
Mike Christie | 28a8f0d | 2016-06-05 14:32:25 -0500 | [diff] [blame] | 812 | * without REQ_PREFLUSH. |
Mikulas Patocka | af7e466 | 2009-04-09 00:27:16 +0100 | [diff] [blame] | 813 | */ |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 814 | bio->bi_opf &= ~REQ_PREFLUSH; |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 815 | queue_io(md, bio); |
Mikulas Patocka | af7e466 | 2009-04-09 00:27:16 +0100 | [diff] [blame] | 816 | } else { |
Mike Snitzer | b372d36 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 817 | /* done with normal IO or empty flush */ |
Linus Torvalds | 0a82a8d | 2013-04-18 09:00:26 -0700 | [diff] [blame] | 818 | trace_block_bio_complete(md->queue, bio, io_error); |
NeilBrown | e6701ad | 2018-02-15 20:00:15 +1100 | [diff] [blame] | 819 | if (io_error) |
| 820 | bio->bi_error = io_error; |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 821 | bio_endio(bio); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 822 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | } |
| 824 | } |
| 825 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 826 | void disable_write_same(struct mapped_device *md) |
Mike Snitzer | 7eee4ae | 2014-06-02 15:50:06 -0400 | [diff] [blame] | 827 | { |
| 828 | struct queue_limits *limits = dm_get_queue_limits(md); |
| 829 | |
| 830 | /* device doesn't really support WRITE SAME, disable it */ |
| 831 | limits->max_write_same_sectors = 0; |
| 832 | } |
| 833 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 834 | static void clone_endio(struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | { |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 836 | int error = bio->bi_error; |
zhendong chen | 5164bec | 2014-12-17 14:37:04 +0800 | [diff] [blame] | 837 | int r = error; |
Mikulas Patocka | bfc6d41 | 2014-03-04 18:24:49 -0500 | [diff] [blame] | 838 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 839 | struct dm_io *io = tio->io; |
Stefan Bader | 9faf400 | 2006-10-03 01:15:41 -0700 | [diff] [blame] | 840 | struct mapped_device *md = tio->io->md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | dm_endio_fn endio = tio->ti->type->end_io; |
| 842 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | if (endio) { |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 844 | r = endio(tio->ti, bio, error); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 845 | if (r < 0 || r == DM_ENDIO_REQUEUE) |
| 846 | /* |
| 847 | * error and requeue request are handled |
| 848 | * in dec_pending(). |
| 849 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | error = r; |
Kiyoshi Ueda | 45cbcd7 | 2006-12-08 02:41:05 -0800 | [diff] [blame] | 851 | else if (r == DM_ENDIO_INCOMPLETE) |
| 852 | /* The target will handle the io */ |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 853 | return; |
Kiyoshi Ueda | 45cbcd7 | 2006-12-08 02:41:05 -0800 | [diff] [blame] | 854 | else if (r) { |
| 855 | DMWARN("unimplemented target endio return value: %d", r); |
| 856 | BUG(); |
| 857 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | } |
| 859 | |
Mike Christie | e604714 | 2016-06-05 14:32:04 -0500 | [diff] [blame] | 860 | if (unlikely(r == -EREMOTEIO && (bio_op(bio) == REQ_OP_WRITE_SAME) && |
Mike Snitzer | 7eee4ae | 2014-06-02 15:50:06 -0400 | [diff] [blame] | 861 | !bdev_get_queue(bio->bi_bdev)->limits.max_write_same_sectors)) |
| 862 | disable_write_same(md); |
| 863 | |
Mike Snitzer | cfae752 | 2016-04-11 12:05:38 -0400 | [diff] [blame] | 864 | free_tio(tio); |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 865 | dec_pending(io, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | } |
| 867 | |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 868 | /* |
Mike Snitzer | 56a67df | 2010-08-12 04:14:10 +0100 | [diff] [blame] | 869 | * Return maximum size of I/O possible at the supplied sector up to the current |
| 870 | * target boundary. |
| 871 | */ |
| 872 | static sector_t max_io_len_target_boundary(sector_t sector, struct dm_target *ti) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | { |
Mike Snitzer | 56a67df | 2010-08-12 04:14:10 +0100 | [diff] [blame] | 874 | sector_t target_offset = dm_target_offset(ti, sector); |
| 875 | |
| 876 | return ti->len - target_offset; |
| 877 | } |
| 878 | |
| 879 | static sector_t max_io_len(sector_t sector, struct dm_target *ti) |
| 880 | { |
| 881 | sector_t len = max_io_len_target_boundary(sector, ti); |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 882 | sector_t offset, max_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
| 884 | /* |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 885 | * Does the target need to split even further? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | */ |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 887 | if (ti->max_io_len) { |
| 888 | offset = dm_target_offset(ti, sector); |
| 889 | if (unlikely(ti->max_io_len & (ti->max_io_len - 1))) |
| 890 | max_len = sector_div(offset, ti->max_io_len); |
| 891 | else |
| 892 | max_len = offset & (ti->max_io_len - 1); |
| 893 | max_len = ti->max_io_len - max_len; |
| 894 | |
| 895 | if (len > max_len) |
| 896 | len = max_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | } |
| 898 | |
| 899 | return len; |
| 900 | } |
| 901 | |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 902 | int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) |
| 903 | { |
| 904 | if (len > UINT_MAX) { |
| 905 | DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)", |
| 906 | (unsigned long long)len, UINT_MAX); |
| 907 | ti->error = "Maximum size of target IO is too large"; |
| 908 | return -EINVAL; |
| 909 | } |
| 910 | |
| 911 | ti->max_io_len = (uint32_t) len; |
| 912 | |
| 913 | return 0; |
| 914 | } |
| 915 | EXPORT_SYMBOL_GPL(dm_set_target_max_io_len); |
| 916 | |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 917 | static long dm_blk_direct_access(struct block_device *bdev, sector_t sector, |
Linus Torvalds | f0c98eb | 2016-07-28 17:22:07 -0700 | [diff] [blame] | 918 | void **kaddr, pfn_t *pfn, long size) |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 919 | { |
| 920 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 921 | struct dm_table *map; |
| 922 | struct dm_target *ti; |
| 923 | int srcu_idx; |
| 924 | long len, ret = -EIO; |
| 925 | |
| 926 | map = dm_get_live_table(md, &srcu_idx); |
| 927 | if (!map) |
| 928 | goto out; |
| 929 | |
| 930 | ti = dm_table_find_target(map, sector); |
| 931 | if (!dm_target_is_valid(ti)) |
| 932 | goto out; |
| 933 | |
| 934 | len = max_io_len(sector, ti) << SECTOR_SHIFT; |
| 935 | size = min(len, size); |
| 936 | |
| 937 | if (ti->type->direct_access) |
| 938 | ret = ti->type->direct_access(ti, sector, kaddr, pfn, size); |
| 939 | out: |
| 940 | dm_put_live_table(md, srcu_idx); |
| 941 | return min(ret, size); |
| 942 | } |
| 943 | |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 944 | /* |
| 945 | * A target may call dm_accept_partial_bio only from the map routine. It is |
Mike Christie | 28a8f0d | 2016-06-05 14:32:25 -0500 | [diff] [blame] | 946 | * allowed for all bio types except REQ_PREFLUSH. |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 947 | * |
| 948 | * dm_accept_partial_bio informs the dm that the target only wants to process |
| 949 | * additional n_sectors sectors of the bio and the rest of the data should be |
| 950 | * sent in a next bio. |
| 951 | * |
| 952 | * A diagram that explains the arithmetics: |
| 953 | * +--------------------+---------------+-------+ |
| 954 | * | 1 | 2 | 3 | |
| 955 | * +--------------------+---------------+-------+ |
| 956 | * |
| 957 | * <-------------- *tio->len_ptr ---------------> |
| 958 | * <------- bi_size -------> |
| 959 | * <-- n_sectors --> |
| 960 | * |
| 961 | * Region 1 was already iterated over with bio_advance or similar function. |
| 962 | * (it may be empty if the target doesn't use bio_advance) |
| 963 | * Region 2 is the remaining bio size that the target wants to process. |
| 964 | * (it may be empty if region 1 is non-empty, although there is no reason |
| 965 | * to make it empty) |
| 966 | * The target requires that region 3 is to be sent in the next bio. |
| 967 | * |
| 968 | * If the target wants to receive multiple copies of the bio (via num_*bios, etc), |
| 969 | * the partially processed part (the sum of regions 1+2) must be the same for all |
| 970 | * copies of the bio. |
| 971 | */ |
| 972 | void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) |
| 973 | { |
| 974 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
| 975 | unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT; |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 976 | BUG_ON(bio->bi_opf & REQ_PREFLUSH); |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 977 | BUG_ON(bi_size > *tio->len_ptr); |
| 978 | BUG_ON(n_sectors > bi_size); |
| 979 | *tio->len_ptr -= bi_size - n_sectors; |
| 980 | bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; |
| 981 | } |
| 982 | EXPORT_SYMBOL_GPL(dm_accept_partial_bio); |
| 983 | |
Mikulas Patocka | 21582cd | 2017-02-15 11:26:10 -0500 | [diff] [blame] | 984 | /* |
| 985 | * Flush current->bio_list when the target map method blocks. |
| 986 | * This fixes deadlocks in snapshot and possibly in other targets. |
| 987 | */ |
| 988 | struct dm_offload { |
| 989 | struct blk_plug plug; |
| 990 | struct blk_plug_cb cb; |
| 991 | }; |
| 992 | |
| 993 | static void flush_current_bio_list(struct blk_plug_cb *cb, bool from_schedule) |
| 994 | { |
| 995 | struct dm_offload *o = container_of(cb, struct dm_offload, cb); |
| 996 | struct bio_list list; |
| 997 | struct bio *bio; |
NeilBrown | 5959cde | 2017-03-10 17:00:47 +1100 | [diff] [blame] | 998 | int i; |
Mikulas Patocka | 21582cd | 2017-02-15 11:26:10 -0500 | [diff] [blame] | 999 | |
| 1000 | INIT_LIST_HEAD(&o->cb.list); |
| 1001 | |
| 1002 | if (unlikely(!current->bio_list)) |
| 1003 | return; |
| 1004 | |
NeilBrown | 5959cde | 2017-03-10 17:00:47 +1100 | [diff] [blame] | 1005 | for (i = 0; i < 2; i++) { |
| 1006 | list = current->bio_list[i]; |
| 1007 | bio_list_init(¤t->bio_list[i]); |
Mikulas Patocka | 21582cd | 2017-02-15 11:26:10 -0500 | [diff] [blame] | 1008 | |
NeilBrown | 5959cde | 2017-03-10 17:00:47 +1100 | [diff] [blame] | 1009 | while ((bio = bio_list_pop(&list))) { |
| 1010 | struct bio_set *bs = bio->bi_pool; |
| 1011 | if (unlikely(!bs) || bs == fs_bio_set) { |
| 1012 | bio_list_add(¤t->bio_list[i], bio); |
| 1013 | continue; |
| 1014 | } |
| 1015 | |
| 1016 | spin_lock(&bs->rescue_lock); |
| 1017 | bio_list_add(&bs->rescue_list, bio); |
| 1018 | queue_work(bs->rescue_workqueue, &bs->rescue_work); |
| 1019 | spin_unlock(&bs->rescue_lock); |
Mikulas Patocka | 21582cd | 2017-02-15 11:26:10 -0500 | [diff] [blame] | 1020 | } |
Mikulas Patocka | 21582cd | 2017-02-15 11:26:10 -0500 | [diff] [blame] | 1021 | } |
| 1022 | } |
| 1023 | |
| 1024 | static void dm_offload_start(struct dm_offload *o) |
| 1025 | { |
| 1026 | blk_start_plug(&o->plug); |
| 1027 | o->cb.callback = flush_current_bio_list; |
| 1028 | list_add(&o->cb.list, ¤t->plug->cb_list); |
| 1029 | } |
| 1030 | |
| 1031 | static void dm_offload_end(struct dm_offload *o) |
| 1032 | { |
| 1033 | list_del(&o->cb.list); |
| 1034 | blk_finish_plug(&o->plug); |
| 1035 | } |
| 1036 | |
Alasdair G Kergon | bd2a49b | 2013-03-01 22:45:46 +0000 | [diff] [blame] | 1037 | static void __map_bio(struct dm_target_io *tio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | { |
| 1039 | int r; |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 1040 | sector_t sector; |
Mikulas Patocka | 21582cd | 2017-02-15 11:26:10 -0500 | [diff] [blame] | 1041 | struct dm_offload o; |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1042 | struct bio *clone = &tio->clone; |
Alasdair G Kergon | bd2a49b | 2013-03-01 22:45:46 +0000 | [diff] [blame] | 1043 | struct dm_target *ti = tio->ti; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | clone->bi_end_io = clone_endio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | |
| 1047 | /* |
| 1048 | * Map the clone. If r == 0 we don't need to do |
| 1049 | * anything, the target has assumed ownership of |
| 1050 | * this io. |
| 1051 | */ |
| 1052 | atomic_inc(&tio->io->io_count); |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1053 | sector = clone->bi_iter.bi_sector; |
Mikulas Patocka | 21582cd | 2017-02-15 11:26:10 -0500 | [diff] [blame] | 1054 | |
| 1055 | dm_offload_start(&o); |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 1056 | r = ti->type->map(ti, clone); |
Mikulas Patocka | 21582cd | 2017-02-15 11:26:10 -0500 | [diff] [blame] | 1057 | dm_offload_end(&o); |
| 1058 | |
Kiyoshi Ueda | 45cbcd7 | 2006-12-08 02:41:05 -0800 | [diff] [blame] | 1059 | if (r == DM_MAPIO_REMAPPED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | /* the bio has been remapped so dispatch it */ |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 1061 | |
Mike Snitzer | d07335e | 2010-11-16 12:52:38 +0100 | [diff] [blame] | 1062 | trace_block_bio_remap(bdev_get_queue(clone->bi_bdev), clone, |
| 1063 | tio->io->bio->bi_bdev->bd_dev, sector); |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 1064 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | generic_make_request(clone); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 1066 | } else if (r < 0 || r == DM_MAPIO_REQUEUE) { |
| 1067 | /* error the io and bail out, or requeue it if needed */ |
Stefan Bader | 9faf400 | 2006-10-03 01:15:41 -0700 | [diff] [blame] | 1068 | dec_pending(tio->io, r); |
Mike Snitzer | cfae752 | 2016-04-11 12:05:38 -0400 | [diff] [blame] | 1069 | free_tio(tio); |
Mikulas Patocka | ab37844 | 2015-07-01 17:30:36 -0400 | [diff] [blame] | 1070 | } else if (r != DM_MAPIO_SUBMITTED) { |
Kiyoshi Ueda | 45cbcd7 | 2006-12-08 02:41:05 -0800 | [diff] [blame] | 1071 | DMWARN("unimplemented target map return value: %d", r); |
| 1072 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | } |
| 1074 | } |
| 1075 | |
| 1076 | struct clone_info { |
| 1077 | struct mapped_device *md; |
| 1078 | struct dm_table *map; |
| 1079 | struct bio *bio; |
| 1080 | struct dm_io *io; |
| 1081 | sector_t sector; |
Mikulas Patocka | e0d6609 | 2014-03-14 18:40:39 -0400 | [diff] [blame] | 1082 | unsigned sector_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | }; |
| 1084 | |
Mikulas Patocka | e0d6609 | 2014-03-14 18:40:39 -0400 | [diff] [blame] | 1085 | static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) |
Alasdair G Kergon | bd2a49b | 2013-03-01 22:45:46 +0000 | [diff] [blame] | 1086 | { |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1087 | bio->bi_iter.bi_sector = sector; |
| 1088 | bio->bi_iter.bi_size = to_bytes(len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | } |
| 1090 | |
| 1091 | /* |
| 1092 | * Creates a bio that consists of range of complete bvecs. |
| 1093 | */ |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1094 | static int clone_bio(struct dm_target_io *tio, struct bio *bio, |
| 1095 | sector_t sector, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | { |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1097 | struct bio *clone = &tio->clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1099 | __bio_clone_fast(clone, bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1101 | if (bio_integrity(bio)) { |
| 1102 | int r = bio_integrity_clone(clone, bio, GFP_NOIO); |
| 1103 | if (r < 0) |
| 1104 | return r; |
| 1105 | } |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1106 | |
| 1107 | bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector)); |
| 1108 | clone->bi_iter.bi_size = to_bytes(len); |
| 1109 | |
| 1110 | if (bio_integrity(bio)) |
| 1111 | bio_integrity_trim(clone, 0, len); |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1112 | |
| 1113 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | } |
| 1115 | |
Alasdair G Kergon | 9015df2 | 2009-06-22 10:12:21 +0100 | [diff] [blame] | 1116 | static struct dm_target_io *alloc_tio(struct clone_info *ci, |
Junichi Nomura | 9977827 | 2014-10-03 11:55:16 +0000 | [diff] [blame] | 1117 | struct dm_target *ti, |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1118 | unsigned target_bio_nr) |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1119 | { |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1120 | struct dm_target_io *tio; |
| 1121 | struct bio *clone; |
| 1122 | |
Junichi Nomura | 9977827 | 2014-10-03 11:55:16 +0000 | [diff] [blame] | 1123 | clone = bio_alloc_bioset(GFP_NOIO, 0, ci->md->bs); |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1124 | tio = container_of(clone, struct dm_target_io, clone); |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1125 | |
| 1126 | tio->io = ci->io; |
| 1127 | tio->ti = ti; |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1128 | tio->target_bio_nr = target_bio_nr; |
Alasdair G Kergon | 9015df2 | 2009-06-22 10:12:21 +0100 | [diff] [blame] | 1129 | |
| 1130 | return tio; |
| 1131 | } |
| 1132 | |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1133 | static void __clone_and_map_simple_bio(struct clone_info *ci, |
| 1134 | struct dm_target *ti, |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1135 | unsigned target_bio_nr, unsigned *len) |
Alasdair G Kergon | 9015df2 | 2009-06-22 10:12:21 +0100 | [diff] [blame] | 1136 | { |
Junichi Nomura | 9977827 | 2014-10-03 11:55:16 +0000 | [diff] [blame] | 1137 | struct dm_target_io *tio = alloc_tio(ci, ti, target_bio_nr); |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1138 | struct bio *clone = &tio->clone; |
Alasdair G Kergon | 9015df2 | 2009-06-22 10:12:21 +0100 | [diff] [blame] | 1139 | |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1140 | tio->len_ptr = len; |
| 1141 | |
Junichi Nomura | 9977827 | 2014-10-03 11:55:16 +0000 | [diff] [blame] | 1142 | __bio_clone_fast(clone, ci->bio); |
Alasdair G Kergon | bd2a49b | 2013-03-01 22:45:46 +0000 | [diff] [blame] | 1143 | if (len) |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1144 | bio_setup_sector(clone, ci->sector, *len); |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1145 | |
Alasdair G Kergon | bd2a49b | 2013-03-01 22:45:46 +0000 | [diff] [blame] | 1146 | __map_bio(tio); |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1147 | } |
| 1148 | |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1149 | static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1150 | unsigned num_bios, unsigned *len) |
Mike Snitzer | 06a426c | 2010-08-12 04:14:09 +0100 | [diff] [blame] | 1151 | { |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1152 | unsigned target_bio_nr; |
Mike Snitzer | 06a426c | 2010-08-12 04:14:09 +0100 | [diff] [blame] | 1153 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1154 | for (target_bio_nr = 0; target_bio_nr < num_bios; target_bio_nr++) |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1155 | __clone_and_map_simple_bio(ci, ti, target_bio_nr, len); |
Mike Snitzer | 06a426c | 2010-08-12 04:14:09 +0100 | [diff] [blame] | 1156 | } |
| 1157 | |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1158 | static int __send_empty_flush(struct clone_info *ci) |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1159 | { |
Mike Snitzer | 06a426c | 2010-08-12 04:14:09 +0100 | [diff] [blame] | 1160 | unsigned target_nr = 0; |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1161 | struct dm_target *ti; |
| 1162 | |
Mike Snitzer | b372d36 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 1163 | BUG_ON(bio_has_data(ci->bio)); |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1164 | while ((ti = dm_table_get_target(ci->map, target_nr++))) |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1165 | __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL); |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1166 | |
Mikulas Patocka | f9ab94c | 2009-06-22 10:12:20 +0100 | [diff] [blame] | 1167 | return 0; |
| 1168 | } |
| 1169 | |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1170 | static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti, |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1171 | sector_t sector, unsigned *len) |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1172 | { |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1173 | struct bio *bio = ci->bio; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1174 | struct dm_target_io *tio; |
Alasdair G Kergon | b0d8ed4 | 2013-03-01 22:45:49 +0000 | [diff] [blame] | 1175 | unsigned target_bio_nr; |
| 1176 | unsigned num_target_bios = 1; |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1177 | int r = 0; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1178 | |
Alasdair G Kergon | b0d8ed4 | 2013-03-01 22:45:49 +0000 | [diff] [blame] | 1179 | /* |
| 1180 | * Does the target want to receive duplicate copies of the bio? |
| 1181 | */ |
| 1182 | if (bio_data_dir(bio) == WRITE && ti->num_write_bios) |
| 1183 | num_target_bios = ti->num_write_bios(ti, bio); |
Alasdair G Kergon | e4c9381 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1184 | |
Alasdair G Kergon | b0d8ed4 | 2013-03-01 22:45:49 +0000 | [diff] [blame] | 1185 | for (target_bio_nr = 0; target_bio_nr < num_target_bios; target_bio_nr++) { |
Junichi Nomura | 9977827 | 2014-10-03 11:55:16 +0000 | [diff] [blame] | 1186 | tio = alloc_tio(ci, ti, target_bio_nr); |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1187 | tio->len_ptr = len; |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1188 | r = clone_bio(tio, bio, sector, *len); |
Mikulas Patocka | 072623d | 2016-04-09 12:48:18 -0400 | [diff] [blame] | 1189 | if (r < 0) { |
Mike Snitzer | cfae752 | 2016-04-11 12:05:38 -0400 | [diff] [blame] | 1190 | free_tio(tio); |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1191 | break; |
Mikulas Patocka | 072623d | 2016-04-09 12:48:18 -0400 | [diff] [blame] | 1192 | } |
Alasdair G Kergon | b0d8ed4 | 2013-03-01 22:45:49 +0000 | [diff] [blame] | 1193 | __map_bio(tio); |
| 1194 | } |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1195 | |
| 1196 | return r; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1197 | } |
| 1198 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1199 | typedef unsigned (*get_num_bios_fn)(struct dm_target *ti); |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1200 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1201 | static unsigned get_num_discard_bios(struct dm_target *ti) |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1202 | { |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1203 | return ti->num_discard_bios; |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1204 | } |
| 1205 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1206 | static unsigned get_num_write_same_bios(struct dm_target *ti) |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1207 | { |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1208 | return ti->num_write_same_bios; |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1209 | } |
| 1210 | |
| 1211 | typedef bool (*is_split_required_fn)(struct dm_target *ti); |
| 1212 | |
| 1213 | static bool is_split_required_for_discard(struct dm_target *ti) |
| 1214 | { |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1215 | return ti->split_discard_bios; |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1216 | } |
| 1217 | |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1218 | static int __send_changing_extent_only(struct clone_info *ci, |
| 1219 | get_num_bios_fn get_num_bios, |
| 1220 | is_split_required_fn is_split_required) |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1221 | { |
| 1222 | struct dm_target *ti; |
Mikulas Patocka | e0d6609 | 2014-03-14 18:40:39 -0400 | [diff] [blame] | 1223 | unsigned len; |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1224 | unsigned num_bios; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1225 | |
Mike Snitzer | a79245b | 2010-08-12 04:14:24 +0100 | [diff] [blame] | 1226 | do { |
| 1227 | ti = dm_table_find_target(ci->map, ci->sector); |
| 1228 | if (!dm_target_is_valid(ti)) |
| 1229 | return -EIO; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1230 | |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1231 | /* |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1232 | * Even though the device advertised support for this type of |
| 1233 | * request, that does not mean every target supports it, and |
Mike Snitzer | 936688d | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 1234 | * reconfiguration might also have changed that since the |
Mike Snitzer | a79245b | 2010-08-12 04:14:24 +0100 | [diff] [blame] | 1235 | * check was performed. |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1236 | */ |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1237 | num_bios = get_num_bios ? get_num_bios(ti) : 0; |
| 1238 | if (!num_bios) |
Mike Snitzer | a79245b | 2010-08-12 04:14:24 +0100 | [diff] [blame] | 1239 | return -EOPNOTSUPP; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1240 | |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1241 | if (is_split_required && !is_split_required(ti)) |
Mikulas Patocka | e0d6609 | 2014-03-14 18:40:39 -0400 | [diff] [blame] | 1242 | len = min((sector_t)ci->sector_count, max_io_len_target_boundary(ci->sector, ti)); |
Mikulas Patocka | 7acf027 | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 1243 | else |
Mikulas Patocka | e0d6609 | 2014-03-14 18:40:39 -0400 | [diff] [blame] | 1244 | len = min((sector_t)ci->sector_count, max_io_len(ci->sector, ti)); |
Mike Snitzer | 06a426c | 2010-08-12 04:14:09 +0100 | [diff] [blame] | 1245 | |
Mikulas Patocka | 1dd40c3 | 2014-03-14 18:41:24 -0400 | [diff] [blame] | 1246 | __send_duplicate_bios(ci, ti, num_bios, &len); |
Mike Snitzer | a79245b | 2010-08-12 04:14:24 +0100 | [diff] [blame] | 1247 | |
| 1248 | ci->sector += len; |
| 1249 | } while (ci->sector_count -= len); |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1250 | |
| 1251 | return 0; |
| 1252 | } |
| 1253 | |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1254 | static int __send_discard(struct clone_info *ci) |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1255 | { |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1256 | return __send_changing_extent_only(ci, get_num_discard_bios, |
| 1257 | is_split_required_for_discard); |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1258 | } |
| 1259 | |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1260 | static int __send_write_same(struct clone_info *ci) |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1261 | { |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1262 | return __send_changing_extent_only(ci, get_num_write_same_bios, NULL); |
Mike Snitzer | 23508a9 | 2012-12-21 20:23:37 +0000 | [diff] [blame] | 1263 | } |
| 1264 | |
Alasdair G Kergon | e4c9381 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1265 | /* |
Alasdair G Kergon | e4c9381 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1266 | * Select the correct strategy for processing a non-flush bio. |
| 1267 | */ |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1268 | static int __split_and_process_non_flush(struct clone_info *ci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | { |
Mikulas Patocka | dba1416 | 2012-10-12 21:02:15 +0100 | [diff] [blame] | 1270 | struct bio *bio = ci->bio; |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1271 | struct dm_target *ti; |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1272 | unsigned len; |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1273 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | |
Mike Christie | e604714 | 2016-06-05 14:32:04 -0500 | [diff] [blame] | 1275 | if (unlikely(bio_op(bio) == REQ_OP_DISCARD)) |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1276 | return __send_discard(ci); |
Mike Christie | e604714 | 2016-06-05 14:32:04 -0500 | [diff] [blame] | 1277 | else if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1278 | return __send_write_same(ci); |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1279 | |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1280 | ti = dm_table_find_target(ci->map, ci->sector); |
| 1281 | if (!dm_target_is_valid(ti)) |
| 1282 | return -EIO; |
| 1283 | |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1284 | len = min_t(sector_t, max_io_len(ci->sector, ti), ci->sector_count); |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1285 | |
Mike Snitzer | c80914e | 2016-03-02 12:33:03 -0500 | [diff] [blame] | 1286 | r = __clone_and_map_data_bio(ci, ti, ci->sector, &len); |
| 1287 | if (r < 0) |
| 1288 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1290 | ci->sector += len; |
| 1291 | ci->sector_count -= len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | |
Kent Overstreet | 1c3b13e | 2013-10-29 17:17:49 -0700 | [diff] [blame] | 1293 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | } |
| 1295 | |
| 1296 | /* |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1297 | * Entry point to split a bio into clones and submit them to the targets. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | */ |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1299 | static void __split_and_process_bio(struct mapped_device *md, |
| 1300 | struct dm_table *map, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | { |
| 1302 | struct clone_info ci; |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1303 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1305 | if (unlikely(!map)) { |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 1306 | bio_io_error(bio); |
Mikulas Patocka | f0b9a45 | 2009-04-02 19:55:38 +0100 | [diff] [blame] | 1307 | return; |
| 1308 | } |
Mikulas Patocka | 692d0eb | 2009-04-09 00:27:13 +0100 | [diff] [blame] | 1309 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1310 | ci.map = map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | ci.md = md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | ci.io = alloc_io(md); |
| 1313 | ci.io->error = 0; |
| 1314 | atomic_set(&ci.io->io_count, 1); |
| 1315 | ci.io->bio = bio; |
| 1316 | ci.io->md = md; |
Kiyoshi Ueda | f88fb98 | 2009-10-16 23:18:15 +0100 | [diff] [blame] | 1317 | spin_lock_init(&ci.io->endio_lock); |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1318 | ci.sector = bio->bi_iter.bi_sector; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | |
Jun'ichi "Nick" Nomura | 3eaf840 | 2006-02-01 03:04:53 -0800 | [diff] [blame] | 1320 | start_io_acct(ci.io); |
Alasdair G Kergon | bd2a49b | 2013-03-01 22:45:46 +0000 | [diff] [blame] | 1321 | |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 1322 | if (bio->bi_opf & REQ_PREFLUSH) { |
Mike Snitzer | b372d36 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 1323 | ci.bio = &ci.md->flush_bio; |
| 1324 | ci.sector_count = 0; |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1325 | error = __send_empty_flush(&ci); |
Mike Snitzer | b372d36 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 1326 | /* dec_pending submits any data associated with flush */ |
| 1327 | } else { |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 1328 | ci.bio = bio; |
Tejun Heo | d87f4c1 | 2010-09-03 11:56:19 +0200 | [diff] [blame] | 1329 | ci.sector_count = bio_sectors(bio); |
Mike Snitzer | b372d36 | 2010-09-08 18:07:01 +0200 | [diff] [blame] | 1330 | while (ci.sector_count && !error) |
Alasdair G Kergon | 14fe594 | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1331 | error = __split_and_process_non_flush(&ci); |
Tejun Heo | d87f4c1 | 2010-09-03 11:56:19 +0200 | [diff] [blame] | 1332 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | |
| 1334 | /* drop the extra reference count */ |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1335 | dec_pending(ci.io, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | } |
| 1337 | /*----------------------------------------------------------------- |
| 1338 | * CRUD END |
| 1339 | *---------------------------------------------------------------*/ |
| 1340 | |
| 1341 | /* |
| 1342 | * The request function that just remaps the bio built up by |
| 1343 | * dm_merge_bvec. |
| 1344 | */ |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1345 | static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | { |
Kevin Corry | 12f03a4 | 2006-02-01 03:04:52 -0800 | [diff] [blame] | 1347 | int rw = bio_data_dir(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | struct mapped_device *md = q->queuedata; |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1349 | int srcu_idx; |
| 1350 | struct dm_table *map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1352 | map = dm_get_live_table(md, &srcu_idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | |
Gu Zheng | 18c0b22 | 2014-11-24 11:05:26 +0800 | [diff] [blame] | 1354 | generic_start_io_acct(rw, bio_sectors(bio), &dm_disk(md)->part0); |
Kevin Corry | 12f03a4 | 2006-02-01 03:04:52 -0800 | [diff] [blame] | 1355 | |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 1356 | /* if we're suspended, we have to queue this io for later */ |
| 1357 | if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) { |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1358 | dm_put_live_table(md, srcu_idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 1360 | if (!(bio->bi_opf & REQ_RAHEAD)) |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 1361 | queue_io(md, bio); |
| 1362 | else |
Alasdair G Kergon | 54d9a1b | 2009-04-09 00:27:14 +0100 | [diff] [blame] | 1363 | bio_io_error(bio); |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1364 | return BLK_QC_T_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | } |
| 1366 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1367 | __split_and_process_bio(md, map, bio); |
| 1368 | dm_put_live_table(md, srcu_idx); |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1369 | return BLK_QC_T_NONE; |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 1370 | } |
| 1371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | static int dm_any_congested(void *congested_data, int bdi_bits) |
| 1373 | { |
Chandra Seetharaman | 8a57dfc | 2008-11-13 23:39:14 +0000 | [diff] [blame] | 1374 | int r = bdi_bits; |
| 1375 | struct mapped_device *md = congested_data; |
| 1376 | struct dm_table *map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
Alasdair G Kergon | 1eb787e | 2009-04-09 00:27:14 +0100 | [diff] [blame] | 1378 | if (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
Mike Snitzer | e522c03 | 2016-02-02 22:35:06 -0500 | [diff] [blame] | 1379 | if (dm_request_based(md)) { |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 1380 | /* |
Mike Snitzer | e522c03 | 2016-02-02 22:35:06 -0500 | [diff] [blame] | 1381 | * With request-based DM we only need to check the |
| 1382 | * top-level queue for congestion. |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 1383 | */ |
Jan Kara | 1cdb7f9 | 2017-02-02 15:56:50 +0100 | [diff] [blame] | 1384 | r = md->queue->backing_dev_info->wb.state & bdi_bits; |
Mike Snitzer | e522c03 | 2016-02-02 22:35:06 -0500 | [diff] [blame] | 1385 | } else { |
| 1386 | map = dm_get_live_table_fast(md); |
| 1387 | if (map) |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 1388 | r = dm_table_any_congested(map, bdi_bits); |
Mike Snitzer | e522c03 | 2016-02-02 22:35:06 -0500 | [diff] [blame] | 1389 | dm_put_live_table_fast(md); |
Chandra Seetharaman | 8a57dfc | 2008-11-13 23:39:14 +0000 | [diff] [blame] | 1390 | } |
| 1391 | } |
| 1392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | return r; |
| 1394 | } |
| 1395 | |
| 1396 | /*----------------------------------------------------------------- |
| 1397 | * An IDR is used to keep track of allocated minor numbers. |
| 1398 | *---------------------------------------------------------------*/ |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 1399 | static void free_minor(int minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | { |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1401 | spin_lock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | idr_remove(&_minor_idr, minor); |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1403 | spin_unlock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | } |
| 1405 | |
| 1406 | /* |
| 1407 | * See if the device with a specific minor # is free. |
| 1408 | */ |
Frederik Deweerdt | cf13ab8 | 2008-04-24 22:10:59 +0100 | [diff] [blame] | 1409 | static int specific_minor(int minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | { |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1411 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | |
| 1413 | if (minor >= (1 << MINORBITS)) |
| 1414 | return -EINVAL; |
| 1415 | |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1416 | idr_preload(GFP_KERNEL); |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1417 | spin_lock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1419 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1421 | spin_unlock(&_minor_lock); |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1422 | idr_preload_end(); |
| 1423 | if (r < 0) |
| 1424 | return r == -ENOSPC ? -EBUSY : r; |
| 1425 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | } |
| 1427 | |
Frederik Deweerdt | cf13ab8 | 2008-04-24 22:10:59 +0100 | [diff] [blame] | 1428 | static int next_free_minor(int *minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | { |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1430 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1432 | idr_preload(GFP_KERNEL); |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1433 | spin_lock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1435 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1437 | spin_unlock(&_minor_lock); |
Tejun Heo | c9d76be | 2013-02-27 17:04:26 -0800 | [diff] [blame] | 1438 | idr_preload_end(); |
| 1439 | if (r < 0) |
| 1440 | return r; |
| 1441 | *minor = r; |
| 1442 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | } |
| 1444 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 1445 | static const struct block_device_operations dm_blk_dops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | |
Mikulas Patocka | 53d5914 | 2009-04-02 19:55:37 +0100 | [diff] [blame] | 1447 | static void dm_wq_work(struct work_struct *work); |
| 1448 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 1449 | void dm_init_md_queue(struct mapped_device *md) |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 1450 | { |
| 1451 | /* |
| 1452 | * Request-based dm devices cannot be stacked on top of bio-based dm |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1453 | * devices. The type of this dm device may not have been decided yet. |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 1454 | * The type is decided at the first table loading time. |
| 1455 | * To prevent problematic device stacking, clear the queue flag |
| 1456 | * for request stacking support until then. |
| 1457 | * |
| 1458 | * This queue is new, so no concurrency on the queue_flags. |
| 1459 | */ |
| 1460 | queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue); |
Mikulas Patocka | ad5f498 | 2015-10-27 19:06:55 -0400 | [diff] [blame] | 1461 | |
| 1462 | /* |
| 1463 | * Initialize data that will only be used by a non-blk-mq DM queue |
| 1464 | * - must do so here (in alloc_dev callchain) before queue is used |
| 1465 | */ |
| 1466 | md->queue->queuedata = md; |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1467 | } |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 1468 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 1469 | void dm_init_normal_md_queue(struct mapped_device *md) |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1470 | { |
Mike Snitzer | 17e149b | 2015-03-11 15:01:09 -0400 | [diff] [blame] | 1471 | md->use_blk_mq = false; |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1472 | dm_init_md_queue(md); |
| 1473 | |
| 1474 | /* |
| 1475 | * Initialize aspects of queue that aren't relevant for blk-mq |
| 1476 | */ |
jianzhou | 5687ffb | 2020-03-16 14:32:52 +0800 | [diff] [blame] | 1477 | md->queue->backing_dev_info->congested_data = md; |
Jan Kara | 1cdb7f9 | 2017-02-02 15:56:50 +0100 | [diff] [blame] | 1478 | md->queue->backing_dev_info->congested_fn = dm_any_congested; |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 1479 | blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY); |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 1480 | } |
| 1481 | |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1482 | static void cleanup_mapped_device(struct mapped_device *md) |
| 1483 | { |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1484 | if (md->wq) |
| 1485 | destroy_workqueue(md->wq); |
| 1486 | if (md->kworker_task) |
| 1487 | kthread_stop(md->kworker_task); |
Julia Lawall | 6f65985 | 2015-09-13 14:15:05 +0200 | [diff] [blame] | 1488 | mempool_destroy(md->io_pool); |
| 1489 | mempool_destroy(md->rq_pool); |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1490 | if (md->bs) |
| 1491 | bioset_free(md->bs); |
| 1492 | |
| 1493 | if (md->disk) { |
| 1494 | spin_lock(&_minor_lock); |
| 1495 | md->disk->private_data = NULL; |
| 1496 | spin_unlock(&_minor_lock); |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1497 | del_gendisk(md->disk); |
| 1498 | put_disk(md->disk); |
| 1499 | } |
| 1500 | |
| 1501 | if (md->queue) |
| 1502 | blk_cleanup_queue(md->queue); |
| 1503 | |
Tahsin Erdogan | d09960b | 2016-10-10 05:35:19 -0700 | [diff] [blame] | 1504 | cleanup_srcu_struct(&md->io_barrier); |
| 1505 | |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1506 | if (md->bdev) { |
| 1507 | bdput(md->bdev); |
| 1508 | md->bdev = NULL; |
| 1509 | } |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 1510 | |
| 1511 | dm_mq_cleanup_mapped_device(md); |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1512 | } |
| 1513 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | /* |
| 1515 | * Allocate and initialise a blank device with a given minor. |
| 1516 | */ |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 1517 | static struct mapped_device *alloc_dev(int minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | { |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 1519 | int r, numa_node_id = dm_get_numa_node(); |
| 1520 | struct mapped_device *md; |
Jeff Mahoney | ba61fdd | 2006-06-26 00:27:21 -0700 | [diff] [blame] | 1521 | void *old_md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | |
Mikulas Patocka | 67246fb | 2017-10-31 19:33:02 -0400 | [diff] [blame] | 1523 | md = vzalloc_node(sizeof(*md), numa_node_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | if (!md) { |
| 1525 | DMWARN("unable to allocate device, out of memory."); |
| 1526 | return NULL; |
| 1527 | } |
| 1528 | |
Jeff Mahoney | 10da4f7 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1529 | if (!try_module_get(THIS_MODULE)) |
Milan Broz | 6ed7ade | 2008-02-08 02:10:19 +0000 | [diff] [blame] | 1530 | goto bad_module_get; |
Jeff Mahoney | 10da4f7 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1531 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | /* get a minor number for the dev */ |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 1533 | if (minor == DM_ANY_MINOR) |
Frederik Deweerdt | cf13ab8 | 2008-04-24 22:10:59 +0100 | [diff] [blame] | 1534 | r = next_free_minor(&minor); |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 1535 | else |
Frederik Deweerdt | cf13ab8 | 2008-04-24 22:10:59 +0100 | [diff] [blame] | 1536 | r = specific_minor(minor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | if (r < 0) |
Milan Broz | 6ed7ade | 2008-02-08 02:10:19 +0000 | [diff] [blame] | 1538 | goto bad_minor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1540 | r = init_srcu_struct(&md->io_barrier); |
| 1541 | if (r < 0) |
| 1542 | goto bad_io_barrier; |
| 1543 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 1544 | md->numa_node_id = numa_node_id; |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 1545 | md->use_blk_mq = dm_use_blk_mq_default(); |
Mike Snitzer | 591ddcf | 2016-01-31 12:05:42 -0500 | [diff] [blame] | 1546 | md->init_tio_pdu = false; |
Mike Snitzer | a5664da | 2010-08-12 04:14:01 +0100 | [diff] [blame] | 1547 | md->type = DM_TYPE_NONE; |
Daniel Walker | e61290a | 2008-02-08 02:10:08 +0000 | [diff] [blame] | 1548 | mutex_init(&md->suspend_lock); |
Mike Snitzer | a5664da | 2010-08-12 04:14:01 +0100 | [diff] [blame] | 1549 | mutex_init(&md->type_lock); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 1550 | mutex_init(&md->table_devices_lock); |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 1551 | spin_lock_init(&md->deferred_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | atomic_set(&md->holders, 1); |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 1553 | atomic_set(&md->open_count, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | atomic_set(&md->event_nr, 0); |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 1555 | atomic_set(&md->uevent_seq, 0); |
| 1556 | INIT_LIST_HEAD(&md->uevent_list); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 1557 | INIT_LIST_HEAD(&md->table_devices); |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 1558 | spin_lock_init(&md->uevent_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 1560 | md->queue = blk_alloc_queue_node(GFP_KERNEL, numa_node_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | if (!md->queue) |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1562 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 1564 | dm_init_md_queue(md); |
Mike Snitzer | e68f18b | 2020-01-27 14:07:23 -0500 | [diff] [blame] | 1565 | /* |
| 1566 | * default to bio-based required ->make_request_fn until DM |
| 1567 | * table is loaded and md->type established. If request-based |
| 1568 | * table is loaded: blk-mq will override accordingly. |
| 1569 | */ |
| 1570 | blk_queue_make_request(md->queue, dm_make_request); |
Stefan Bader | 9faf400 | 2006-10-03 01:15:41 -0700 | [diff] [blame] | 1571 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 1572 | md->disk = alloc_disk_node(1, numa_node_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | if (!md->disk) |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1574 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | |
Nikanth Karthikesan | 316d315 | 2009-10-06 20:16:55 +0200 | [diff] [blame] | 1576 | atomic_set(&md->pending[0], 0); |
| 1577 | atomic_set(&md->pending[1], 0); |
Jeff Mahoney | f0b0411 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1578 | init_waitqueue_head(&md->wait); |
Mikulas Patocka | 53d5914 | 2009-04-02 19:55:37 +0100 | [diff] [blame] | 1579 | INIT_WORK(&md->work, dm_wq_work); |
Jeff Mahoney | f0b0411 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1580 | init_waitqueue_head(&md->eventq); |
Mikulas Patocka | 2995fa7 | 2014-01-13 19:37:54 -0500 | [diff] [blame] | 1581 | init_completion(&md->kobj_holder.completion); |
Keith Busch | 2eb6e1e | 2014-10-17 17:46:36 -0600 | [diff] [blame] | 1582 | md->kworker_task = NULL; |
Jeff Mahoney | f0b0411 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | md->disk->major = _major; |
| 1585 | md->disk->first_minor = minor; |
| 1586 | md->disk->fops = &dm_blk_dops; |
| 1587 | md->disk->queue = md->queue; |
| 1588 | md->disk->private_data = md; |
| 1589 | sprintf(md->disk->disk_name, "dm-%d", minor); |
| 1590 | add_disk(md->disk); |
Mike Anderson | 7e51f25 | 2006-03-27 01:17:52 -0800 | [diff] [blame] | 1591 | format_dev_t(md->name, MKDEV(_major, minor)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | |
Tejun Heo | 670368a | 2013-07-30 08:40:21 -0400 | [diff] [blame] | 1593 | md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0); |
Milan Broz | 304f3f6 | 2008-02-08 02:11:17 +0000 | [diff] [blame] | 1594 | if (!md->wq) |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1595 | goto bad; |
Milan Broz | 304f3f6 | 2008-02-08 02:11:17 +0000 | [diff] [blame] | 1596 | |
Mikulas Patocka | 32a926d | 2009-06-22 10:12:17 +0100 | [diff] [blame] | 1597 | md->bdev = bdget_disk(md->disk, 0); |
| 1598 | if (!md->bdev) |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1599 | goto bad; |
Mikulas Patocka | 32a926d | 2009-06-22 10:12:17 +0100 | [diff] [blame] | 1600 | |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 1601 | bio_init(&md->flush_bio); |
| 1602 | md->flush_bio.bi_bdev = md->bdev; |
Mike Christie | e604714 | 2016-06-05 14:32:04 -0500 | [diff] [blame] | 1603 | bio_set_op_attrs(&md->flush_bio, REQ_OP_WRITE, WRITE_FLUSH); |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 1604 | |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 1605 | dm_stats_init(&md->stats); |
| 1606 | |
Jeff Mahoney | ba61fdd | 2006-06-26 00:27:21 -0700 | [diff] [blame] | 1607 | /* Populate the mapping, nobody knows we exist yet */ |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1608 | spin_lock(&_minor_lock); |
Jeff Mahoney | ba61fdd | 2006-06-26 00:27:21 -0700 | [diff] [blame] | 1609 | old_md = idr_replace(&_minor_idr, md, minor); |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1610 | spin_unlock(&_minor_lock); |
Jeff Mahoney | ba61fdd | 2006-06-26 00:27:21 -0700 | [diff] [blame] | 1611 | |
| 1612 | BUG_ON(old_md != MINOR_ALLOCED); |
| 1613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | return md; |
| 1615 | |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1616 | bad: |
| 1617 | cleanup_mapped_device(md); |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1618 | bad_io_barrier: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | free_minor(minor); |
Milan Broz | 6ed7ade | 2008-02-08 02:10:19 +0000 | [diff] [blame] | 1620 | bad_minor: |
Jeff Mahoney | 10da4f7 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1621 | module_put(THIS_MODULE); |
Milan Broz | 6ed7ade | 2008-02-08 02:10:19 +0000 | [diff] [blame] | 1622 | bad_module_get: |
Mikulas Patocka | 67246fb | 2017-10-31 19:33:02 -0400 | [diff] [blame] | 1623 | kvfree(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | return NULL; |
| 1625 | } |
| 1626 | |
Jun'ichi Nomura | ae9da83 | 2007-10-19 22:38:43 +0100 | [diff] [blame] | 1627 | static void unlock_fs(struct mapped_device *md); |
| 1628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | static void free_dev(struct mapped_device *md) |
| 1630 | { |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 1631 | int minor = MINOR(disk_devt(md->disk)); |
Jun'ichi Nomura | 63d94e4 | 2006-02-24 13:04:25 -0800 | [diff] [blame] | 1632 | |
Mikulas Patocka | 32a926d | 2009-06-22 10:12:17 +0100 | [diff] [blame] | 1633 | unlock_fs(md); |
Keith Busch | 2eb6e1e | 2014-10-17 17:46:36 -0600 | [diff] [blame] | 1634 | |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1635 | cleanup_mapped_device(md); |
Mike Snitzer | 0f20972 | 2015-04-28 11:50:29 -0400 | [diff] [blame] | 1636 | |
| 1637 | free_table_devices(&md->table_devices); |
| 1638 | dm_stats_cleanup(&md->stats); |
Mike Snitzer | 63a4f06 | 2015-03-23 17:01:43 -0400 | [diff] [blame] | 1639 | free_minor(minor); |
| 1640 | |
Jeff Mahoney | 10da4f7 | 2006-06-26 00:27:25 -0700 | [diff] [blame] | 1641 | module_put(THIS_MODULE); |
Mikulas Patocka | 67246fb | 2017-10-31 19:33:02 -0400 | [diff] [blame] | 1642 | kvfree(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | } |
| 1644 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1645 | static void __bind_mempools(struct mapped_device *md, struct dm_table *t) |
| 1646 | { |
Mikulas Patocka | c0820cf | 2012-12-21 20:23:38 +0000 | [diff] [blame] | 1647 | struct dm_md_mempools *p = dm_table_get_md_mempools(t); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1648 | |
Mike Snitzer | 4e6e36c | 2015-06-26 09:42:57 -0400 | [diff] [blame] | 1649 | if (md->bs) { |
| 1650 | /* The md already has necessary mempools. */ |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1651 | if (dm_table_bio_based(t)) { |
Jun'ichi Nomura | 16245bd | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 1652 | /* |
| 1653 | * Reload bioset because front_pad may have changed |
| 1654 | * because a different table was loaded. |
| 1655 | */ |
| 1656 | bioset_free(md->bs); |
| 1657 | md->bs = p->bs; |
| 1658 | p->bs = NULL; |
Jun'ichi Nomura | 16245bd | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 1659 | } |
Mike Snitzer | 4e6e36c | 2015-06-26 09:42:57 -0400 | [diff] [blame] | 1660 | /* |
| 1661 | * There's no need to reload with request-based dm |
| 1662 | * because the size of front_pad doesn't change. |
| 1663 | * Note for future: If you are to reload bioset, |
| 1664 | * prep-ed requests in the queue may refer |
| 1665 | * to bio from the old bioset, so you must walk |
| 1666 | * through the queue to unprep. |
| 1667 | */ |
| 1668 | goto out; |
Mikulas Patocka | c0820cf | 2012-12-21 20:23:38 +0000 | [diff] [blame] | 1669 | } |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1670 | |
Mike Snitzer | cbc4e3c | 2015-04-27 16:37:50 -0400 | [diff] [blame] | 1671 | BUG_ON(!p || md->io_pool || md->rq_pool || md->bs); |
| 1672 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1673 | md->io_pool = p->io_pool; |
| 1674 | p->io_pool = NULL; |
Mike Snitzer | 1ae49ea | 2014-12-05 17:11:05 -0500 | [diff] [blame] | 1675 | md->rq_pool = p->rq_pool; |
| 1676 | p->rq_pool = NULL; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1677 | md->bs = p->bs; |
| 1678 | p->bs = NULL; |
Mike Snitzer | 4e6e36c | 2015-06-26 09:42:57 -0400 | [diff] [blame] | 1679 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1680 | out: |
Mike Snitzer | 0223334 | 2015-03-10 23:49:26 -0400 | [diff] [blame] | 1681 | /* mempool bind completed, no longer need any mempools in the table */ |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1682 | dm_table_free_md_mempools(t); |
| 1683 | } |
| 1684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | /* |
| 1686 | * Bind a table to the device. |
| 1687 | */ |
| 1688 | static void event_callback(void *context) |
| 1689 | { |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 1690 | unsigned long flags; |
| 1691 | LIST_HEAD(uevents); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | struct mapped_device *md = (struct mapped_device *) context; |
| 1693 | |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 1694 | spin_lock_irqsave(&md->uevent_lock, flags); |
| 1695 | list_splice_init(&md->uevent_list, &uevents); |
| 1696 | spin_unlock_irqrestore(&md->uevent_lock, flags); |
| 1697 | |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 1698 | dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 1699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | atomic_inc(&md->event_nr); |
| 1701 | wake_up(&md->eventq); |
| 1702 | } |
| 1703 | |
Mike Snitzer | c217649 | 2011-01-13 19:53:46 +0000 | [diff] [blame] | 1704 | /* |
| 1705 | * Protected by md->suspend_lock obtained by dm_swap_table(). |
| 1706 | */ |
Alasdair G Kergon | 4e90188be | 2005-07-28 21:15:59 -0700 | [diff] [blame] | 1707 | static void __set_size(struct mapped_device *md, sector_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | { |
Alasdair G Kergon | 4e90188be | 2005-07-28 21:15:59 -0700 | [diff] [blame] | 1709 | set_capacity(md->disk, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | |
Mikulas Patocka | db8fef4 | 2009-06-22 10:12:15 +0100 | [diff] [blame] | 1711 | i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | } |
| 1713 | |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 1714 | /* |
| 1715 | * Returns old map, which caller must destroy. |
| 1716 | */ |
| 1717 | static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, |
| 1718 | struct queue_limits *limits) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | { |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 1720 | struct dm_table *old_map; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1721 | struct request_queue *q = md->queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | sector_t size; |
| 1723 | |
Bart Van Assche | 5a8f1f8 | 2016-08-31 15:17:04 -0700 | [diff] [blame] | 1724 | lockdep_assert_held(&md->suspend_lock); |
| 1725 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | size = dm_table_get_size(t); |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1727 | |
| 1728 | /* |
| 1729 | * Wipe any geometry if the size of the table changed. |
| 1730 | */ |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 1731 | if (size != dm_get_size(md)) |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1732 | memset(&md->geometry, 0, sizeof(md->geometry)); |
| 1733 | |
Mikulas Patocka | 32a926d | 2009-06-22 10:12:17 +0100 | [diff] [blame] | 1734 | __set_size(md, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 1736 | dm_table_event_callback(t, event_callback, md); |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 1737 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1738 | /* |
| 1739 | * The queue hasn't been stopped yet, if the old table type wasn't |
| 1740 | * for request-based during suspension. So stop it to prevent |
| 1741 | * I/O mapping before resume. |
| 1742 | * This must be done before setting the queue restrictions, |
| 1743 | * because request-based dm may be run just after the setting. |
| 1744 | */ |
Mike Snitzer | 16f1226 | 2016-01-31 17:22:27 -0500 | [diff] [blame] | 1745 | if (dm_table_request_based(t)) { |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 1746 | dm_stop_queue(q); |
Mike Snitzer | 16f1226 | 2016-01-31 17:22:27 -0500 | [diff] [blame] | 1747 | /* |
| 1748 | * Leverage the fact that request-based DM targets are |
| 1749 | * immutable singletons and establish md->immutable_target |
| 1750 | * - used to optimize both dm_request_fn and dm_mq_queue_rq |
| 1751 | */ |
| 1752 | md->immutable_target = dm_table_get_immutable_target(t); |
| 1753 | } |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1754 | |
| 1755 | __bind_mempools(md, t); |
| 1756 | |
Eric Dumazet | a12f5d4 | 2014-11-23 09:34:29 -0800 | [diff] [blame] | 1757 | old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
Mike Snitzer | 1d3aa6f | 2016-02-22 14:14:24 -0500 | [diff] [blame] | 1758 | rcu_assign_pointer(md->map, (void *)t); |
Alasdair G Kergon | 36a0456 | 2011-10-31 20:19:04 +0000 | [diff] [blame] | 1759 | md->immutable_target_type = dm_table_get_immutable_target_type(t); |
| 1760 | |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1761 | dm_table_set_restrictions(t, q, limits); |
Hannes Reinecke | 41abc4e | 2014-11-05 14:35:50 +0100 | [diff] [blame] | 1762 | if (old_map) |
| 1763 | dm_sync_table(md); |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 1764 | |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 1765 | return old_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | } |
| 1767 | |
Alasdair G Kergon | a794015 | 2009-12-10 23:52:23 +0000 | [diff] [blame] | 1768 | /* |
| 1769 | * Returns unbound table for the caller to free. |
| 1770 | */ |
| 1771 | static struct dm_table *__unbind(struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | { |
Eric Dumazet | a12f5d4 | 2014-11-23 09:34:29 -0800 | [diff] [blame] | 1773 | struct dm_table *map = rcu_dereference_protected(md->map, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | |
| 1775 | if (!map) |
Alasdair G Kergon | a794015 | 2009-12-10 23:52:23 +0000 | [diff] [blame] | 1776 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | |
| 1778 | dm_table_event_callback(map, NULL, NULL); |
Monam Agarwal | 9cdb852 | 2014-03-23 23:58:27 +0530 | [diff] [blame] | 1779 | RCU_INIT_POINTER(md->map, NULL); |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1780 | dm_sync_table(md); |
Alasdair G Kergon | a794015 | 2009-12-10 23:52:23 +0000 | [diff] [blame] | 1781 | |
| 1782 | return map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | } |
| 1784 | |
| 1785 | /* |
| 1786 | * Constructor for a new device. |
| 1787 | */ |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 1788 | int dm_create(int minor, struct mapped_device **result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | { |
| 1790 | struct mapped_device *md; |
| 1791 | |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 1792 | md = alloc_dev(minor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | if (!md) |
| 1794 | return -ENXIO; |
| 1795 | |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 1796 | dm_sysfs_init(md); |
| 1797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1798 | *result = md; |
| 1799 | return 0; |
| 1800 | } |
| 1801 | |
Mike Snitzer | a5664da | 2010-08-12 04:14:01 +0100 | [diff] [blame] | 1802 | /* |
| 1803 | * Functions to manage md->type. |
| 1804 | * All are required to hold md->type_lock. |
| 1805 | */ |
| 1806 | void dm_lock_md_type(struct mapped_device *md) |
| 1807 | { |
| 1808 | mutex_lock(&md->type_lock); |
| 1809 | } |
| 1810 | |
| 1811 | void dm_unlock_md_type(struct mapped_device *md) |
| 1812 | { |
| 1813 | mutex_unlock(&md->type_lock); |
| 1814 | } |
| 1815 | |
| 1816 | void dm_set_md_type(struct mapped_device *md, unsigned type) |
| 1817 | { |
Mike Snitzer | 00c4fc3 | 2013-08-27 18:57:03 -0400 | [diff] [blame] | 1818 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
Mike Snitzer | a5664da | 2010-08-12 04:14:01 +0100 | [diff] [blame] | 1819 | md->type = type; |
| 1820 | } |
| 1821 | |
| 1822 | unsigned dm_get_md_type(struct mapped_device *md) |
| 1823 | { |
| 1824 | return md->type; |
| 1825 | } |
| 1826 | |
Alasdair G Kergon | 36a0456 | 2011-10-31 20:19:04 +0000 | [diff] [blame] | 1827 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md) |
| 1828 | { |
| 1829 | return md->immutable_target_type; |
| 1830 | } |
| 1831 | |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 1832 | /* |
Mike Snitzer | f84cb8a | 2013-09-19 12:13:58 -0400 | [diff] [blame] | 1833 | * The queue_limits are only valid as long as you have a reference |
| 1834 | * count on 'md'. |
| 1835 | */ |
| 1836 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md) |
| 1837 | { |
| 1838 | BUG_ON(!atomic_read(&md->holders)); |
| 1839 | return &md->queue->limits; |
| 1840 | } |
| 1841 | EXPORT_SYMBOL_GPL(dm_get_queue_limits); |
| 1842 | |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 1843 | /* |
| 1844 | * Setup the DM device's queue based on md's type |
| 1845 | */ |
Mike Snitzer | 591ddcf | 2016-01-31 12:05:42 -0500 | [diff] [blame] | 1846 | int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t) |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 1847 | { |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1848 | int r; |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1849 | unsigned type = dm_get_md_type(md); |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1850 | |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1851 | switch (type) { |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1852 | case DM_TYPE_REQUEST_BASED: |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 1853 | r = dm_old_init_request_queue(md); |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1854 | if (r) { |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 1855 | DMERR("Cannot initialize queue for request-based mapped device"); |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1856 | return r; |
Mike Snitzer | ff36ab3 | 2015-02-23 17:56:37 -0500 | [diff] [blame] | 1857 | } |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1858 | break; |
| 1859 | case DM_TYPE_MQ_REQUEST_BASED: |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 1860 | r = dm_mq_init_request_queue(md, t); |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1861 | if (r) { |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 1862 | DMERR("Cannot initialize queue for request-based dm-mq mapped device"); |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1863 | return r; |
| 1864 | } |
| 1865 | break; |
| 1866 | case DM_TYPE_BIO_BASED: |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1867 | case DM_TYPE_DAX_BIO_BASED: |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 1868 | dm_init_normal_md_queue(md); |
Mikulas Patocka | dbba42d | 2015-10-21 16:34:20 -0400 | [diff] [blame] | 1869 | /* |
| 1870 | * DM handles splitting bios as needed. Free the bio_split bioset |
| 1871 | * since it won't be used (saves 1 process per bio-based DM device). |
| 1872 | */ |
| 1873 | bioset_free(md->queue->bio_split); |
| 1874 | md->queue->bio_split = NULL; |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1875 | |
| 1876 | if (type == DM_TYPE_DAX_BIO_BASED) |
| 1877 | queue_flag_set_unlocked(QUEUE_FLAG_DAX, md->queue); |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1878 | break; |
Mike Snitzer | 4a0b4dd | 2010-08-12 04:14:02 +0100 | [diff] [blame] | 1879 | } |
| 1880 | |
| 1881 | return 0; |
| 1882 | } |
| 1883 | |
Mikulas Patocka | 2bec1f4 | 2015-02-17 14:30:53 -0500 | [diff] [blame] | 1884 | struct mapped_device *dm_get_md(dev_t dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | { |
| 1886 | struct mapped_device *md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | unsigned minor = MINOR(dev); |
| 1888 | |
| 1889 | if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) |
| 1890 | return NULL; |
| 1891 | |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1892 | spin_lock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | |
| 1894 | md = idr_find(&_minor_idr, minor); |
Mikulas Patocka | 2bec1f4 | 2015-02-17 14:30:53 -0500 | [diff] [blame] | 1895 | if (md) { |
| 1896 | if ((md == MINOR_ALLOCED || |
| 1897 | (MINOR(disk_devt(dm_disk(md))) != minor) || |
| 1898 | dm_deleting_md(md) || |
| 1899 | test_bit(DMF_FREEING, &md->flags))) { |
| 1900 | md = NULL; |
| 1901 | goto out; |
| 1902 | } |
| 1903 | dm_get(md); |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 1904 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 1906 | out: |
Jeff Mahoney | f32c10b | 2006-06-26 00:27:22 -0700 | [diff] [blame] | 1907 | spin_unlock(&_minor_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | |
David Teigland | 637842c | 2006-01-06 00:20:00 -0800 | [diff] [blame] | 1909 | return md; |
| 1910 | } |
Alasdair G Kergon | 3cf2e4b | 2011-10-31 20:19:06 +0000 | [diff] [blame] | 1911 | EXPORT_SYMBOL_GPL(dm_get_md); |
David Teigland | d229a95 | 2006-01-06 00:20:01 -0800 | [diff] [blame] | 1912 | |
Alasdair G Kergon | 9ade92a | 2006-03-27 01:17:53 -0800 | [diff] [blame] | 1913 | void *dm_get_mdptr(struct mapped_device *md) |
David Teigland | 637842c | 2006-01-06 00:20:00 -0800 | [diff] [blame] | 1914 | { |
Alasdair G Kergon | 9ade92a | 2006-03-27 01:17:53 -0800 | [diff] [blame] | 1915 | return md->interface_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | } |
| 1917 | |
| 1918 | void dm_set_mdptr(struct mapped_device *md, void *ptr) |
| 1919 | { |
| 1920 | md->interface_ptr = ptr; |
| 1921 | } |
| 1922 | |
| 1923 | void dm_get(struct mapped_device *md) |
| 1924 | { |
| 1925 | atomic_inc(&md->holders); |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 1926 | BUG_ON(test_bit(DMF_FREEING, &md->flags)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1927 | } |
| 1928 | |
Mikulas Patocka | 09ee96b | 2015-02-26 11:41:28 -0500 | [diff] [blame] | 1929 | int dm_hold(struct mapped_device *md) |
| 1930 | { |
| 1931 | spin_lock(&_minor_lock); |
| 1932 | if (test_bit(DMF_FREEING, &md->flags)) { |
| 1933 | spin_unlock(&_minor_lock); |
| 1934 | return -EBUSY; |
| 1935 | } |
| 1936 | dm_get(md); |
| 1937 | spin_unlock(&_minor_lock); |
| 1938 | return 0; |
| 1939 | } |
| 1940 | EXPORT_SYMBOL_GPL(dm_hold); |
| 1941 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1942 | const char *dm_device_name(struct mapped_device *md) |
| 1943 | { |
| 1944 | return md->name; |
| 1945 | } |
| 1946 | EXPORT_SYMBOL_GPL(dm_device_name); |
| 1947 | |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 1948 | static void __dm_destroy(struct mapped_device *md, bool wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | { |
Bart Van Assche | 3b785fb | 2016-08-31 15:17:49 -0700 | [diff] [blame] | 1950 | struct request_queue *q = dm_get_md_queue(md); |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1951 | struct dm_table *map; |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1952 | int srcu_idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 1954 | might_sleep(); |
Jeff Mahoney | fba9f90 | 2006-06-26 00:27:23 -0700 | [diff] [blame] | 1955 | |
Mike Snitzer | 63a4f06 | 2015-03-23 17:01:43 -0400 | [diff] [blame] | 1956 | spin_lock(&_minor_lock); |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 1957 | idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md)))); |
| 1958 | set_bit(DMF_FREEING, &md->flags); |
| 1959 | spin_unlock(&_minor_lock); |
| 1960 | |
Bart Van Assche | 5de1a7f | 2016-11-18 14:26:47 -0800 | [diff] [blame] | 1961 | blk_set_queue_dying(q); |
Bart Van Assche | 3b785fb | 2016-08-31 15:17:49 -0700 | [diff] [blame] | 1962 | |
Mike Snitzer | 0223334 | 2015-03-10 23:49:26 -0400 | [diff] [blame] | 1963 | if (dm_request_based(md) && md->kworker_task) |
Petr Mladek | 3989144 | 2016-10-11 13:55:20 -0700 | [diff] [blame] | 1964 | kthread_flush_worker(&md->kworker); |
Keith Busch | 2eb6e1e | 2014-10-17 17:46:36 -0600 | [diff] [blame] | 1965 | |
Mikulas Patocka | ab7c7bb | 2015-02-27 14:04:27 -0500 | [diff] [blame] | 1966 | /* |
| 1967 | * Take suspend_lock so that presuspend and postsuspend methods |
| 1968 | * do not race with internal suspend. |
| 1969 | */ |
| 1970 | mutex_lock(&md->suspend_lock); |
Junichi Nomura | 2a708cf | 2015-10-01 08:31:51 +0000 | [diff] [blame] | 1971 | map = dm_get_live_table(md, &srcu_idx); |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 1972 | if (!dm_suspended_md(md)) { |
| 1973 | dm_table_presuspend_targets(map); |
| 1974 | dm_table_postsuspend_targets(map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | } |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1976 | /* dm_put_live_table must be before msleep, otherwise deadlock is possible */ |
| 1977 | dm_put_live_table(md, srcu_idx); |
Junichi Nomura | 2a708cf | 2015-10-01 08:31:51 +0000 | [diff] [blame] | 1978 | mutex_unlock(&md->suspend_lock); |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 1979 | |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 1980 | /* |
| 1981 | * Rare, but there may be I/O requests still going to complete, |
| 1982 | * for example. Wait for all references to disappear. |
| 1983 | * No one should increment the reference count of the mapped_device, |
| 1984 | * after the mapped_device state becomes DMF_FREEING. |
| 1985 | */ |
| 1986 | if (wait) |
| 1987 | while (atomic_read(&md->holders)) |
| 1988 | msleep(1); |
| 1989 | else if (atomic_read(&md->holders)) |
| 1990 | DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)", |
| 1991 | dm_device_name(md), atomic_read(&md->holders)); |
| 1992 | |
| 1993 | dm_sysfs_exit(md); |
Kiyoshi Ueda | 3f77316d | 2010-08-12 04:13:56 +0100 | [diff] [blame] | 1994 | dm_table_destroy(__unbind(md)); |
| 1995 | free_dev(md); |
| 1996 | } |
| 1997 | |
| 1998 | void dm_destroy(struct mapped_device *md) |
| 1999 | { |
| 2000 | __dm_destroy(md, true); |
| 2001 | } |
| 2002 | |
| 2003 | void dm_destroy_immediate(struct mapped_device *md) |
| 2004 | { |
| 2005 | __dm_destroy(md, false); |
| 2006 | } |
| 2007 | |
| 2008 | void dm_put(struct mapped_device *md) |
| 2009 | { |
| 2010 | atomic_dec(&md->holders); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | } |
Edward Goggin | 79eb885 | 2007-05-09 02:32:56 -0700 | [diff] [blame] | 2012 | EXPORT_SYMBOL_GPL(dm_put); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | |
Bart Van Assche | b48633f | 2016-08-31 15:16:02 -0700 | [diff] [blame] | 2014 | static int dm_wait_for_completion(struct mapped_device *md, long task_state) |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2015 | { |
| 2016 | int r = 0; |
Bart Van Assche | 9f4c3f8 | 2016-08-31 15:16:43 -0700 | [diff] [blame] | 2017 | DEFINE_WAIT(wait); |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2018 | |
| 2019 | while (1) { |
Bart Van Assche | 9f4c3f8 | 2016-08-31 15:16:43 -0700 | [diff] [blame] | 2020 | prepare_to_wait(&md->wait, &wait, task_state); |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2021 | |
Kiyoshi Ueda | b4324fe | 2009-12-10 23:52:16 +0000 | [diff] [blame] | 2022 | if (!md_in_flight(md)) |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2023 | break; |
| 2024 | |
Bart Van Assche | e3fabdf | 2016-08-31 15:16:22 -0700 | [diff] [blame] | 2025 | if (signal_pending_state(task_state, current)) { |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2026 | r = -EINTR; |
| 2027 | break; |
| 2028 | } |
| 2029 | |
| 2030 | io_schedule(); |
| 2031 | } |
Bart Van Assche | 9f4c3f8 | 2016-08-31 15:16:43 -0700 | [diff] [blame] | 2032 | finish_wait(&md->wait, &wait); |
Mikulas Patocka | b44ebeb | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 2033 | |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2034 | return r; |
| 2035 | } |
| 2036 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | /* |
| 2038 | * Process the deferred bios |
| 2039 | */ |
Mikulas Patocka | ef20858 | 2009-04-02 19:55:38 +0100 | [diff] [blame] | 2040 | static void dm_wq_work(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | { |
Mikulas Patocka | ef20858 | 2009-04-02 19:55:38 +0100 | [diff] [blame] | 2042 | struct mapped_device *md = container_of(work, struct mapped_device, |
| 2043 | work); |
Milan Broz | 6d6f10d | 2008-02-08 02:10:22 +0000 | [diff] [blame] | 2044 | struct bio *c; |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2045 | int srcu_idx; |
| 2046 | struct dm_table *map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2048 | map = dm_get_live_table(md, &srcu_idx); |
Mikulas Patocka | ef20858 | 2009-04-02 19:55:38 +0100 | [diff] [blame] | 2049 | |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2050 | while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
Alasdair G Kergon | df12ee9 | 2009-04-09 00:27:13 +0100 | [diff] [blame] | 2051 | spin_lock_irq(&md->deferred_lock); |
| 2052 | c = bio_list_pop(&md->deferred); |
| 2053 | spin_unlock_irq(&md->deferred_lock); |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 2054 | |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 2055 | if (!c) |
Alasdair G Kergon | df12ee9 | 2009-04-09 00:27:13 +0100 | [diff] [blame] | 2056 | break; |
Alasdair G Kergon | df12ee9 | 2009-04-09 00:27:13 +0100 | [diff] [blame] | 2057 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2058 | if (dm_request_based(md)) |
| 2059 | generic_make_request(c); |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 2060 | else |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2061 | __split_and_process_bio(md, map, c); |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 2062 | } |
Milan Broz | 73d410c | 2008-02-08 02:10:25 +0000 | [diff] [blame] | 2063 | |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2064 | dm_put_live_table(md, srcu_idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | } |
| 2066 | |
Mikulas Patocka | 9a1fb46 | 2009-04-02 19:55:36 +0100 | [diff] [blame] | 2067 | static void dm_queue_flush(struct mapped_device *md) |
Milan Broz | 304f3f6 | 2008-02-08 02:11:17 +0000 | [diff] [blame] | 2068 | { |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2069 | clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 2070 | smp_mb__after_atomic(); |
Mikulas Patocka | 53d5914 | 2009-04-02 19:55:37 +0100 | [diff] [blame] | 2071 | queue_work(md->wq, &md->work); |
Milan Broz | 304f3f6 | 2008-02-08 02:11:17 +0000 | [diff] [blame] | 2072 | } |
| 2073 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2074 | /* |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2075 | * Swap in a new table, returning the old one for the caller to destroy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | */ |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2077 | struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | { |
Mike Christie | 87eb5b2 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2079 | struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 2080 | struct queue_limits limits; |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2081 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2082 | |
Daniel Walker | e61290a | 2008-02-08 02:10:08 +0000 | [diff] [blame] | 2083 | mutex_lock(&md->suspend_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | |
| 2085 | /* device must be suspended */ |
Kiyoshi Ueda | 4f186f8 | 2009-12-10 23:52:26 +0000 | [diff] [blame] | 2086 | if (!dm_suspended_md(md)) |
Alasdair G Kergon | 93c534a | 2005-07-12 15:53:05 -0700 | [diff] [blame] | 2087 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | |
Mike Snitzer | 3ae7065 | 2012-09-26 23:45:45 +0100 | [diff] [blame] | 2089 | /* |
| 2090 | * If the new table has no data devices, retain the existing limits. |
| 2091 | * This helps multipath with queue_if_no_path if all paths disappear, |
| 2092 | * then new I/O is queued based on these limits, and then some paths |
| 2093 | * reappear. |
| 2094 | */ |
| 2095 | if (dm_table_has_no_data_devices(table)) { |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2096 | live_map = dm_get_live_table_fast(md); |
Mike Snitzer | 3ae7065 | 2012-09-26 23:45:45 +0100 | [diff] [blame] | 2097 | if (live_map) |
| 2098 | limits = md->queue->limits; |
Mikulas Patocka | 83d5e5b | 2013-07-10 23:41:18 +0100 | [diff] [blame] | 2099 | dm_put_live_table_fast(md); |
Mike Snitzer | 3ae7065 | 2012-09-26 23:45:45 +0100 | [diff] [blame] | 2100 | } |
| 2101 | |
Mike Christie | 87eb5b2 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2102 | if (!live_map) { |
| 2103 | r = dm_calculate_queue_limits(table, &limits); |
| 2104 | if (r) { |
| 2105 | map = ERR_PTR(r); |
| 2106 | goto out; |
| 2107 | } |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2108 | } |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 2109 | |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2110 | map = __bind(md, table, &limits); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | |
Alasdair G Kergon | 93c534a | 2005-07-12 15:53:05 -0700 | [diff] [blame] | 2112 | out: |
Daniel Walker | e61290a | 2008-02-08 02:10:08 +0000 | [diff] [blame] | 2113 | mutex_unlock(&md->suspend_lock); |
Alasdair G Kergon | 042d2a9 | 2009-12-10 23:52:24 +0000 | [diff] [blame] | 2114 | return map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | } |
| 2116 | |
| 2117 | /* |
| 2118 | * Functions to lock and unlock any filesystem running on the |
| 2119 | * device. |
| 2120 | */ |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2121 | static int lock_fs(struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | { |
Alasdair G Kergon | e39e2e9 | 2006-01-06 00:20:05 -0800 | [diff] [blame] | 2123 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | |
| 2125 | WARN_ON(md->frozen_sb); |
Alasdair G Kergon | dfbe03f | 2005-05-05 16:16:04 -0700 | [diff] [blame] | 2126 | |
Mikulas Patocka | db8fef4 | 2009-06-22 10:12:15 +0100 | [diff] [blame] | 2127 | md->frozen_sb = freeze_bdev(md->bdev); |
Alasdair G Kergon | dfbe03f | 2005-05-05 16:16:04 -0700 | [diff] [blame] | 2128 | if (IS_ERR(md->frozen_sb)) { |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 2129 | r = PTR_ERR(md->frozen_sb); |
Alasdair G Kergon | e39e2e9 | 2006-01-06 00:20:05 -0800 | [diff] [blame] | 2130 | md->frozen_sb = NULL; |
| 2131 | return r; |
Alasdair G Kergon | dfbe03f | 2005-05-05 16:16:04 -0700 | [diff] [blame] | 2132 | } |
| 2133 | |
Alasdair G Kergon | aa8d7c2 | 2006-01-06 00:20:06 -0800 | [diff] [blame] | 2134 | set_bit(DMF_FROZEN, &md->flags); |
| 2135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2136 | return 0; |
| 2137 | } |
| 2138 | |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2139 | static void unlock_fs(struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | { |
Alasdair G Kergon | aa8d7c2 | 2006-01-06 00:20:06 -0800 | [diff] [blame] | 2141 | if (!test_bit(DMF_FROZEN, &md->flags)) |
| 2142 | return; |
| 2143 | |
Mikulas Patocka | db8fef4 | 2009-06-22 10:12:15 +0100 | [diff] [blame] | 2144 | thaw_bdev(md->bdev, md->frozen_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2145 | md->frozen_sb = NULL; |
Alasdair G Kergon | aa8d7c2 | 2006-01-06 00:20:06 -0800 | [diff] [blame] | 2146 | clear_bit(DMF_FROZEN, &md->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2147 | } |
| 2148 | |
| 2149 | /* |
Bart Van Assche | b48633f | 2016-08-31 15:16:02 -0700 | [diff] [blame] | 2150 | * @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG |
| 2151 | * @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE |
| 2152 | * @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY |
| 2153 | * |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2154 | * If __dm_suspend returns 0, the device is completely quiescent |
| 2155 | * now. There is no request-processing activity. All new requests |
| 2156 | * are being added to md->deferred list. |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2157 | * |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2158 | * Caller must hold md->suspend_lock |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2159 | */ |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2160 | static int __dm_suspend(struct mapped_device *md, struct dm_table *map, |
Bart Van Assche | b48633f | 2016-08-31 15:16:02 -0700 | [diff] [blame] | 2161 | unsigned suspend_flags, long task_state, |
Mike Snitzer | eaf9a73 | 2016-08-02 13:07:20 -0400 | [diff] [blame] | 2162 | int dmf_suspended_flag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | { |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2164 | bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; |
| 2165 | bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; |
| 2166 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2167 | |
Bart Van Assche | 5a8f1f8 | 2016-08-31 15:17:04 -0700 | [diff] [blame] | 2168 | lockdep_assert_held(&md->suspend_lock); |
| 2169 | |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 2170 | /* |
| 2171 | * DMF_NOFLUSH_SUSPENDING must be set before presuspend. |
| 2172 | * This flag is cleared before dm_suspend returns. |
| 2173 | */ |
| 2174 | if (noflush) |
| 2175 | set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
| 2176 | |
Mike Snitzer | d67ee21 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 2177 | /* |
| 2178 | * This gets reverted if there's an error later and the targets |
| 2179 | * provide the .presuspend_undo hook. |
| 2180 | */ |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 2181 | dm_table_presuspend_targets(map); |
| 2182 | |
Mikulas Patocka | 32a926d | 2009-06-22 10:12:17 +0100 | [diff] [blame] | 2183 | /* |
Kiyoshi Ueda | 9f518b2 | 2009-12-10 23:52:16 +0000 | [diff] [blame] | 2184 | * Flush I/O to the device. |
| 2185 | * Any I/O submitted after lock_fs() may not be flushed. |
| 2186 | * noflush takes precedence over do_lockfs. |
| 2187 | * (lock_fs() flushes I/Os and waits for them to complete.) |
Mikulas Patocka | 32a926d | 2009-06-22 10:12:17 +0100 | [diff] [blame] | 2188 | */ |
| 2189 | if (!noflush && do_lockfs) { |
| 2190 | r = lock_fs(md); |
Mike Snitzer | d67ee21 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 2191 | if (r) { |
| 2192 | dm_table_presuspend_undo_targets(map); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2193 | return r; |
Mike Snitzer | d67ee21 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 2194 | } |
Alasdair G Kergon | aa8d7c2 | 2006-01-06 00:20:06 -0800 | [diff] [blame] | 2195 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | |
| 2197 | /* |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2198 | * Here we must make sure that no processes are submitting requests |
| 2199 | * to target drivers i.e. no one may be executing |
| 2200 | * __split_and_process_bio. This is called from dm_request and |
| 2201 | * dm_wq_work. |
| 2202 | * |
| 2203 | * To get all processes out of __split_and_process_bio in dm_request, |
| 2204 | * we take the write lock. To prevent any process from reentering |
Tejun Heo | 6a8736d | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 2205 | * __split_and_process_bio from dm_request and quiesce the thread |
| 2206 | * (dm_wq_work), we set BMF_BLOCK_IO_FOR_SUSPEND and call |
| 2207 | * flush_workqueue(md->wq). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | */ |
Alasdair G Kergon | 1eb787e | 2009-04-09 00:27:14 +0100 | [diff] [blame] | 2209 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
Hannes Reinecke | 41abc4e | 2014-11-05 14:35:50 +0100 | [diff] [blame] | 2210 | if (map) |
| 2211 | synchronize_srcu(&md->io_barrier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2212 | |
Kiyoshi Ueda | d0bcb87 | 2009-12-10 23:52:18 +0000 | [diff] [blame] | 2213 | /* |
Tejun Heo | 29e4013 | 2010-09-08 18:07:00 +0200 | [diff] [blame] | 2214 | * Stop md->queue before flushing md->wq in case request-based |
| 2215 | * dm defers requests to md->wq from md->queue. |
Kiyoshi Ueda | d0bcb87 | 2009-12-10 23:52:18 +0000 | [diff] [blame] | 2216 | */ |
Keith Busch | 2eb6e1e | 2014-10-17 17:46:36 -0600 | [diff] [blame] | 2217 | if (dm_request_based(md)) { |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 2218 | dm_stop_queue(md->queue); |
Mike Snitzer | 0223334 | 2015-03-10 23:49:26 -0400 | [diff] [blame] | 2219 | if (md->kworker_task) |
Petr Mladek | 3989144 | 2016-10-11 13:55:20 -0700 | [diff] [blame] | 2220 | kthread_flush_worker(&md->kworker); |
Keith Busch | 2eb6e1e | 2014-10-17 17:46:36 -0600 | [diff] [blame] | 2221 | } |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2222 | |
Kiyoshi Ueda | d0bcb87 | 2009-12-10 23:52:18 +0000 | [diff] [blame] | 2223 | flush_workqueue(md->wq); |
| 2224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | /* |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2226 | * At this point no more requests are entering target request routines. |
| 2227 | * We call dm_wait_for_completion to wait for all existing requests |
| 2228 | * to finish. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2229 | */ |
Bart Van Assche | b48633f | 2016-08-31 15:16:02 -0700 | [diff] [blame] | 2230 | r = dm_wait_for_completion(md, task_state); |
Mike Snitzer | eaf9a73 | 2016-08-02 13:07:20 -0400 | [diff] [blame] | 2231 | if (!r) |
| 2232 | set_bit(dmf_suspended_flag, &md->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | |
Milan Broz | 6d6f10d | 2008-02-08 02:10:22 +0000 | [diff] [blame] | 2234 | if (noflush) |
Mikulas Patocka | 022c261 | 2009-04-02 19:55:39 +0100 | [diff] [blame] | 2235 | clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
Hannes Reinecke | 41abc4e | 2014-11-05 14:35:50 +0100 | [diff] [blame] | 2236 | if (map) |
| 2237 | synchronize_srcu(&md->io_barrier); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 2238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | /* were we interrupted ? */ |
Milan Broz | 46125c1 | 2008-02-08 02:10:30 +0000 | [diff] [blame] | 2240 | if (r < 0) { |
Mikulas Patocka | 9a1fb46 | 2009-04-02 19:55:36 +0100 | [diff] [blame] | 2241 | dm_queue_flush(md); |
Milan Broz | 73d410c | 2008-02-08 02:10:25 +0000 | [diff] [blame] | 2242 | |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2243 | if (dm_request_based(md)) |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 2244 | dm_start_queue(md->queue); |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2245 | |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2246 | unlock_fs(md); |
Mike Snitzer | d67ee21 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 2247 | dm_table_presuspend_undo_targets(map); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2248 | /* pushback list is already flushed, so skip flush */ |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2249 | } |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2250 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2251 | return r; |
| 2252 | } |
| 2253 | |
| 2254 | /* |
| 2255 | * We need to be able to change a mapping table under a mounted |
| 2256 | * filesystem. For example we might want to move some data in |
| 2257 | * the background. Before the table can be swapped with |
| 2258 | * dm_bind_table, dm_suspend must be called to flush any in |
| 2259 | * flight bios and ensure that any further io gets deferred. |
| 2260 | */ |
| 2261 | /* |
| 2262 | * Suspend mechanism in request-based dm. |
| 2263 | * |
| 2264 | * 1. Flush all I/Os by lock_fs() if needed. |
| 2265 | * 2. Stop dispatching any I/O by stopping the request_queue. |
| 2266 | * 3. Wait for all in-flight I/Os to be completed or requeued. |
| 2267 | * |
| 2268 | * To abort suspend, start the request_queue. |
| 2269 | */ |
| 2270 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags) |
| 2271 | { |
| 2272 | struct dm_table *map = NULL; |
| 2273 | int r = 0; |
| 2274 | |
| 2275 | retry: |
| 2276 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
| 2277 | |
| 2278 | if (dm_suspended_md(md)) { |
| 2279 | r = -EINVAL; |
| 2280 | goto out_unlock; |
| 2281 | } |
| 2282 | |
| 2283 | if (dm_suspended_internally_md(md)) { |
| 2284 | /* already internally suspended, wait for internal resume */ |
| 2285 | mutex_unlock(&md->suspend_lock); |
| 2286 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); |
| 2287 | if (r) |
| 2288 | return r; |
| 2289 | goto retry; |
| 2290 | } |
| 2291 | |
Eric Dumazet | a12f5d4 | 2014-11-23 09:34:29 -0800 | [diff] [blame] | 2292 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2293 | |
Mike Snitzer | eaf9a73 | 2016-08-02 13:07:20 -0400 | [diff] [blame] | 2294 | r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2295 | if (r) |
| 2296 | goto out_unlock; |
Mikulas Patocka | 3b00b20 | 2009-04-09 00:27:15 +0100 | [diff] [blame] | 2297 | |
Kiyoshi Ueda | 4d4471c | 2009-12-10 23:52:26 +0000 | [diff] [blame] | 2298 | dm_table_postsuspend_targets(map); |
| 2299 | |
Alasdair G Kergon | d287483 | 2006-11-08 17:44:43 -0800 | [diff] [blame] | 2300 | out_unlock: |
Daniel Walker | e61290a | 2008-02-08 02:10:08 +0000 | [diff] [blame] | 2301 | mutex_unlock(&md->suspend_lock); |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 2302 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | } |
| 2304 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2305 | static int __dm_resume(struct mapped_device *md, struct dm_table *map) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | { |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2307 | if (map) { |
| 2308 | int r = dm_table_resume_targets(map); |
| 2309 | if (r) |
| 2310 | return r; |
| 2311 | } |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2312 | |
Mikulas Patocka | 9a1fb46 | 2009-04-02 19:55:36 +0100 | [diff] [blame] | 2313 | dm_queue_flush(md); |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2314 | |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2315 | /* |
| 2316 | * Flushing deferred I/Os must be done after targets are resumed |
| 2317 | * so that mapping of targets can work correctly. |
| 2318 | * Request-based dm is queueing the deferred I/Os in its request_queue. |
| 2319 | */ |
| 2320 | if (dm_request_based(md)) |
Mike Snitzer | eca7ee6 | 2016-02-20 13:45:38 -0500 | [diff] [blame] | 2321 | dm_start_queue(md->queue); |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 2322 | |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2323 | unlock_fs(md); |
| 2324 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2325 | return 0; |
| 2326 | } |
| 2327 | |
| 2328 | int dm_resume(struct mapped_device *md) |
| 2329 | { |
Minfei Huang | 8dc2365 | 2016-09-06 16:00:29 +0800 | [diff] [blame] | 2330 | int r; |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2331 | struct dm_table *map = NULL; |
| 2332 | |
| 2333 | retry: |
Minfei Huang | 8dc2365 | 2016-09-06 16:00:29 +0800 | [diff] [blame] | 2334 | r = -EINVAL; |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2335 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
| 2336 | |
| 2337 | if (!dm_suspended_md(md)) |
| 2338 | goto out; |
| 2339 | |
| 2340 | if (dm_suspended_internally_md(md)) { |
| 2341 | /* already internally suspended, wait for internal resume */ |
| 2342 | mutex_unlock(&md->suspend_lock); |
| 2343 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); |
| 2344 | if (r) |
| 2345 | return r; |
| 2346 | goto retry; |
| 2347 | } |
| 2348 | |
Eric Dumazet | a12f5d4 | 2014-11-23 09:34:29 -0800 | [diff] [blame] | 2349 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2350 | if (!map || !dm_table_get_size(map)) |
| 2351 | goto out; |
| 2352 | |
| 2353 | r = __dm_resume(md, map); |
| 2354 | if (r) |
| 2355 | goto out; |
| 2356 | |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2357 | clear_bit(DMF_SUSPENDED, &md->flags); |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 2358 | out: |
Daniel Walker | e61290a | 2008-02-08 02:10:08 +0000 | [diff] [blame] | 2359 | mutex_unlock(&md->suspend_lock); |
Alasdair G Kergon | 2ca3310 | 2005-07-28 21:16:00 -0700 | [diff] [blame] | 2360 | |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 2361 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2362 | } |
| 2363 | |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2364 | /* |
| 2365 | * Internal suspend/resume works like userspace-driven suspend. It waits |
| 2366 | * until all bios finish and prevents issuing new bios to the target drivers. |
| 2367 | * It may be used only from the kernel. |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2368 | */ |
| 2369 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2370 | static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags) |
| 2371 | { |
| 2372 | struct dm_table *map = NULL; |
| 2373 | |
Mikulas Patocka | 96b26c8 | 2015-01-08 18:52:26 -0500 | [diff] [blame] | 2374 | if (md->internal_suspend_count++) |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2375 | return; /* nested internal suspend */ |
| 2376 | |
| 2377 | if (dm_suspended_md(md)) { |
| 2378 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); |
| 2379 | return; /* nest suspend */ |
| 2380 | } |
| 2381 | |
Eric Dumazet | a12f5d4 | 2014-11-23 09:34:29 -0800 | [diff] [blame] | 2382 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2383 | |
| 2384 | /* |
| 2385 | * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is |
| 2386 | * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend |
| 2387 | * would require changing .presuspend to return an error -- avoid this |
| 2388 | * until there is a need for more elaborate variants of internal suspend. |
| 2389 | */ |
Mike Snitzer | eaf9a73 | 2016-08-02 13:07:20 -0400 | [diff] [blame] | 2390 | (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE, |
| 2391 | DMF_SUSPENDED_INTERNALLY); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2392 | |
| 2393 | dm_table_postsuspend_targets(map); |
| 2394 | } |
| 2395 | |
| 2396 | static void __dm_internal_resume(struct mapped_device *md) |
| 2397 | { |
Mikulas Patocka | 96b26c8 | 2015-01-08 18:52:26 -0500 | [diff] [blame] | 2398 | BUG_ON(!md->internal_suspend_count); |
| 2399 | |
| 2400 | if (--md->internal_suspend_count) |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2401 | return; /* resume from nested internal suspend */ |
| 2402 | |
| 2403 | if (dm_suspended_md(md)) |
| 2404 | goto done; /* resume from nested suspend */ |
| 2405 | |
| 2406 | /* |
| 2407 | * NOTE: existing callers don't need to call dm_table_resume_targets |
| 2408 | * (which may fail -- so best to avoid it for now by passing NULL map) |
| 2409 | */ |
| 2410 | (void) __dm_resume(md, NULL); |
| 2411 | |
| 2412 | done: |
| 2413 | clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); |
| 2414 | smp_mb__after_atomic(); |
| 2415 | wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); |
| 2416 | } |
| 2417 | |
| 2418 | void dm_internal_suspend_noflush(struct mapped_device *md) |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2419 | { |
| 2420 | mutex_lock(&md->suspend_lock); |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2421 | __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); |
| 2422 | mutex_unlock(&md->suspend_lock); |
| 2423 | } |
| 2424 | EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); |
| 2425 | |
| 2426 | void dm_internal_resume(struct mapped_device *md) |
| 2427 | { |
| 2428 | mutex_lock(&md->suspend_lock); |
| 2429 | __dm_internal_resume(md); |
| 2430 | mutex_unlock(&md->suspend_lock); |
| 2431 | } |
| 2432 | EXPORT_SYMBOL_GPL(dm_internal_resume); |
| 2433 | |
| 2434 | /* |
| 2435 | * Fast variants of internal suspend/resume hold md->suspend_lock, |
| 2436 | * which prevents interaction with userspace-driven suspend. |
| 2437 | */ |
| 2438 | |
| 2439 | void dm_internal_suspend_fast(struct mapped_device *md) |
| 2440 | { |
| 2441 | mutex_lock(&md->suspend_lock); |
| 2442 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2443 | return; |
| 2444 | |
| 2445 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
| 2446 | synchronize_srcu(&md->io_barrier); |
| 2447 | flush_workqueue(md->wq); |
| 2448 | dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); |
| 2449 | } |
Mikulas Patocka | b735fed | 2015-02-26 11:40:35 -0500 | [diff] [blame] | 2450 | EXPORT_SYMBOL_GPL(dm_internal_suspend_fast); |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2451 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2452 | void dm_internal_resume_fast(struct mapped_device *md) |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2453 | { |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2454 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2455 | goto done; |
| 2456 | |
| 2457 | dm_queue_flush(md); |
| 2458 | |
| 2459 | done: |
| 2460 | mutex_unlock(&md->suspend_lock); |
| 2461 | } |
Mikulas Patocka | b735fed | 2015-02-26 11:40:35 -0500 | [diff] [blame] | 2462 | EXPORT_SYMBOL_GPL(dm_internal_resume_fast); |
Mikulas Patocka | fd2ed4d | 2013-08-16 10:54:23 -0400 | [diff] [blame] | 2463 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | /*----------------------------------------------------------------- |
| 2465 | * Event notification. |
| 2466 | *---------------------------------------------------------------*/ |
Peter Rajnoha | 3abf85b | 2010-03-06 02:32:31 +0000 | [diff] [blame] | 2467 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 2468 | unsigned cookie) |
Alasdair G Kergon | 69267a3 | 2007-12-13 14:15:57 +0000 | [diff] [blame] | 2469 | { |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 2470 | char udev_cookie[DM_COOKIE_LENGTH]; |
| 2471 | char *envp[] = { udev_cookie, NULL }; |
| 2472 | |
| 2473 | if (!cookie) |
Peter Rajnoha | 3abf85b | 2010-03-06 02:32:31 +0000 | [diff] [blame] | 2474 | return kobject_uevent(&disk_to_dev(md->disk)->kobj, action); |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 2475 | else { |
| 2476 | snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u", |
| 2477 | DM_COOKIE_ENV_VAR_NAME, cookie); |
Peter Rajnoha | 3abf85b | 2010-03-06 02:32:31 +0000 | [diff] [blame] | 2478 | return kobject_uevent_env(&disk_to_dev(md->disk)->kobj, |
| 2479 | action, envp); |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 2480 | } |
Alasdair G Kergon | 69267a3 | 2007-12-13 14:15:57 +0000 | [diff] [blame] | 2481 | } |
| 2482 | |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 2483 | uint32_t dm_next_uevent_seq(struct mapped_device *md) |
| 2484 | { |
| 2485 | return atomic_add_return(1, &md->uevent_seq); |
| 2486 | } |
| 2487 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2488 | uint32_t dm_get_event_nr(struct mapped_device *md) |
| 2489 | { |
| 2490 | return atomic_read(&md->event_nr); |
| 2491 | } |
| 2492 | |
| 2493 | int dm_wait_event(struct mapped_device *md, int event_nr) |
| 2494 | { |
| 2495 | return wait_event_interruptible(md->eventq, |
| 2496 | (event_nr != atomic_read(&md->event_nr))); |
| 2497 | } |
| 2498 | |
Mike Anderson | 7a8c3d3 | 2007-10-19 22:48:01 +0100 | [diff] [blame] | 2499 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist) |
| 2500 | { |
| 2501 | unsigned long flags; |
| 2502 | |
| 2503 | spin_lock_irqsave(&md->uevent_lock, flags); |
| 2504 | list_add(elist, &md->uevent_list); |
| 2505 | spin_unlock_irqrestore(&md->uevent_lock, flags); |
| 2506 | } |
| 2507 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2508 | /* |
| 2509 | * The gendisk is only valid as long as you have a reference |
| 2510 | * count on 'md'. |
| 2511 | */ |
| 2512 | struct gendisk *dm_disk(struct mapped_device *md) |
| 2513 | { |
| 2514 | return md->disk; |
| 2515 | } |
Sami Tolvanen | 65ff5b7 | 2015-03-18 15:52:14 +0000 | [diff] [blame] | 2516 | EXPORT_SYMBOL_GPL(dm_disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2518 | struct kobject *dm_kobject(struct mapped_device *md) |
| 2519 | { |
Mikulas Patocka | 2995fa7 | 2014-01-13 19:37:54 -0500 | [diff] [blame] | 2520 | return &md->kobj_holder.kobj; |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2521 | } |
| 2522 | |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2523 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj) |
| 2524 | { |
| 2525 | struct mapped_device *md; |
| 2526 | |
Mikulas Patocka | 2995fa7 | 2014-01-13 19:37:54 -0500 | [diff] [blame] | 2527 | md = container_of(kobj, struct mapped_device, kobj_holder.kobj); |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2528 | |
Hou Tao | 1cd9686 | 2017-11-01 15:42:36 +0800 | [diff] [blame] | 2529 | spin_lock(&_minor_lock); |
| 2530 | if (test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { |
| 2531 | md = NULL; |
| 2532 | goto out; |
| 2533 | } |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2534 | dm_get(md); |
Hou Tao | 1cd9686 | 2017-11-01 15:42:36 +0800 | [diff] [blame] | 2535 | out: |
| 2536 | spin_unlock(&_minor_lock); |
| 2537 | |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 2538 | return md; |
| 2539 | } |
| 2540 | |
Kiyoshi Ueda | 4f186f8 | 2009-12-10 23:52:26 +0000 | [diff] [blame] | 2541 | int dm_suspended_md(struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2542 | { |
| 2543 | return test_bit(DMF_SUSPENDED, &md->flags); |
| 2544 | } |
| 2545 | |
Mike Snitzer | ffcc393 | 2014-10-28 18:34:52 -0400 | [diff] [blame] | 2546 | int dm_suspended_internally_md(struct mapped_device *md) |
| 2547 | { |
| 2548 | return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); |
| 2549 | } |
| 2550 | |
Mikulas Patocka | 2c140a2 | 2013-11-01 18:27:41 -0400 | [diff] [blame] | 2551 | int dm_test_deferred_remove_flag(struct mapped_device *md) |
| 2552 | { |
| 2553 | return test_bit(DMF_DEFERRED_REMOVE, &md->flags); |
| 2554 | } |
| 2555 | |
Kiyoshi Ueda | 64dbce5 | 2009-12-10 23:52:27 +0000 | [diff] [blame] | 2556 | int dm_suspended(struct dm_target *ti) |
| 2557 | { |
Kiyoshi Ueda | ecdb2e2 | 2010-03-06 02:29:52 +0000 | [diff] [blame] | 2558 | return dm_suspended_md(dm_table_get_md(ti->table)); |
Kiyoshi Ueda | 64dbce5 | 2009-12-10 23:52:27 +0000 | [diff] [blame] | 2559 | } |
| 2560 | EXPORT_SYMBOL_GPL(dm_suspended); |
| 2561 | |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 2562 | int dm_noflush_suspending(struct dm_target *ti) |
| 2563 | { |
Kiyoshi Ueda | ecdb2e2 | 2010-03-06 02:29:52 +0000 | [diff] [blame] | 2564 | return __noflush_suspending(dm_table_get_md(ti->table)); |
Kiyoshi Ueda | 2e93ccc | 2006-12-08 02:41:09 -0800 | [diff] [blame] | 2565 | } |
| 2566 | EXPORT_SYMBOL_GPL(dm_noflush_suspending); |
| 2567 | |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2568 | struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned type, |
Mike Snitzer | 30187e1 | 2016-01-31 13:28:26 -0500 | [diff] [blame] | 2569 | unsigned integrity, unsigned per_io_data_size) |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2570 | { |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 2571 | struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id); |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2572 | struct kmem_cache *cachep = NULL; |
| 2573 | unsigned int pool_size = 0; |
Jun'ichi Nomura | 5f01520 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2574 | unsigned int front_pad; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2575 | |
| 2576 | if (!pools) |
Mike Snitzer | 4e6e36c | 2015-06-26 09:42:57 -0400 | [diff] [blame] | 2577 | return NULL; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2578 | |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2579 | switch (type) { |
| 2580 | case DM_TYPE_BIO_BASED: |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 2581 | case DM_TYPE_DAX_BIO_BASED: |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2582 | cachep = _io_cache; |
| 2583 | pool_size = dm_get_reserved_bio_based_ios(); |
Mike Snitzer | 30187e1 | 2016-01-31 13:28:26 -0500 | [diff] [blame] | 2584 | front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone); |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2585 | break; |
| 2586 | case DM_TYPE_REQUEST_BASED: |
| 2587 | cachep = _rq_tio_cache; |
| 2588 | pool_size = dm_get_reserved_rq_based_ios(); |
| 2589 | pools->rq_pool = mempool_create_slab_pool(pool_size, _rq_cache); |
| 2590 | if (!pools->rq_pool) |
| 2591 | goto out; |
| 2592 | /* fall through to setup remaining rq-based pools */ |
| 2593 | case DM_TYPE_MQ_REQUEST_BASED: |
| 2594 | if (!pool_size) |
| 2595 | pool_size = dm_get_reserved_rq_based_ios(); |
| 2596 | front_pad = offsetof(struct dm_rq_clone_bio_info, clone); |
Mike Snitzer | 591ddcf | 2016-01-31 12:05:42 -0500 | [diff] [blame] | 2597 | /* per_io_data_size is used for blk-mq pdu at queue allocation */ |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2598 | break; |
| 2599 | default: |
| 2600 | BUG(); |
| 2601 | } |
| 2602 | |
| 2603 | if (cachep) { |
| 2604 | pools->io_pool = mempool_create_slab_pool(pool_size, cachep); |
| 2605 | if (!pools->io_pool) |
| 2606 | goto out; |
| 2607 | } |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2608 | |
Junichi Nomura | 3d8aab2 | 2014-10-03 11:55:26 +0000 | [diff] [blame] | 2609 | pools->bs = bioset_create_nobvec(pool_size, front_pad); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2610 | if (!pools->bs) |
Jun'ichi Nomura | 5f01520 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2611 | goto out; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2612 | |
Martin K. Petersen | a91a278 | 2011-03-17 11:11:05 +0100 | [diff] [blame] | 2613 | if (integrity && bioset_integrity_create(pools->bs, pool_size)) |
Jun'ichi Nomura | 5f01520 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2614 | goto out; |
Martin K. Petersen | a91a278 | 2011-03-17 11:11:05 +0100 | [diff] [blame] | 2615 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2616 | return pools; |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 2617 | |
Jun'ichi Nomura | 5f01520 | 2013-03-01 22:45:48 +0000 | [diff] [blame] | 2618 | out: |
| 2619 | dm_free_md_mempools(pools); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2620 | |
Mike Snitzer | 4e6e36c | 2015-06-26 09:42:57 -0400 | [diff] [blame] | 2621 | return NULL; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2622 | } |
| 2623 | |
| 2624 | void dm_free_md_mempools(struct dm_md_mempools *pools) |
| 2625 | { |
| 2626 | if (!pools) |
| 2627 | return; |
| 2628 | |
Julia Lawall | 6f65985 | 2015-09-13 14:15:05 +0200 | [diff] [blame] | 2629 | mempool_destroy(pools->io_pool); |
| 2630 | mempool_destroy(pools->rq_pool); |
Mike Snitzer | 1ae49ea | 2014-12-05 17:11:05 -0500 | [diff] [blame] | 2631 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 2632 | if (pools->bs) |
| 2633 | bioset_free(pools->bs); |
| 2634 | |
| 2635 | kfree(pools); |
| 2636 | } |
| 2637 | |
Christoph Hellwig | 9c72bad | 2016-07-08 21:23:51 +0900 | [diff] [blame] | 2638 | struct dm_pr { |
| 2639 | u64 old_key; |
| 2640 | u64 new_key; |
| 2641 | u32 flags; |
| 2642 | bool fail_early; |
| 2643 | }; |
| 2644 | |
| 2645 | static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn, |
| 2646 | void *data) |
| 2647 | { |
| 2648 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 2649 | struct dm_table *table; |
| 2650 | struct dm_target *ti; |
| 2651 | int ret = -ENOTTY, srcu_idx; |
| 2652 | |
| 2653 | table = dm_get_live_table(md, &srcu_idx); |
| 2654 | if (!table || !dm_table_get_size(table)) |
| 2655 | goto out; |
| 2656 | |
| 2657 | /* We only support devices that have a single target */ |
| 2658 | if (dm_table_get_num_targets(table) != 1) |
| 2659 | goto out; |
| 2660 | ti = dm_table_get_target(table, 0); |
| 2661 | |
| 2662 | ret = -EINVAL; |
| 2663 | if (!ti->type->iterate_devices) |
| 2664 | goto out; |
| 2665 | |
| 2666 | ret = ti->type->iterate_devices(ti, fn, data); |
| 2667 | out: |
| 2668 | dm_put_live_table(md, srcu_idx); |
| 2669 | return ret; |
| 2670 | } |
| 2671 | |
| 2672 | /* |
| 2673 | * For register / unregister we need to manually call out to every path. |
| 2674 | */ |
| 2675 | static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev, |
| 2676 | sector_t start, sector_t len, void *data) |
| 2677 | { |
| 2678 | struct dm_pr *pr = data; |
| 2679 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; |
| 2680 | |
| 2681 | if (!ops || !ops->pr_register) |
| 2682 | return -EOPNOTSUPP; |
| 2683 | return ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); |
| 2684 | } |
| 2685 | |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2686 | static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2687 | u32 flags) |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2688 | { |
Christoph Hellwig | 9c72bad | 2016-07-08 21:23:51 +0900 | [diff] [blame] | 2689 | struct dm_pr pr = { |
| 2690 | .old_key = old_key, |
| 2691 | .new_key = new_key, |
| 2692 | .flags = flags, |
| 2693 | .fail_early = true, |
| 2694 | }; |
| 2695 | int ret; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2696 | |
Christoph Hellwig | 9c72bad | 2016-07-08 21:23:51 +0900 | [diff] [blame] | 2697 | ret = dm_call_pr(bdev, __dm_pr_register, &pr); |
| 2698 | if (ret && new_key) { |
| 2699 | /* unregister all paths if we failed to register any path */ |
| 2700 | pr.old_key = new_key; |
| 2701 | pr.new_key = 0; |
| 2702 | pr.flags = 0; |
| 2703 | pr.fail_early = false; |
| 2704 | dm_call_pr(bdev, __dm_pr_register, &pr); |
| 2705 | } |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2706 | |
Christoph Hellwig | 9c72bad | 2016-07-08 21:23:51 +0900 | [diff] [blame] | 2707 | return ret; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2708 | } |
| 2709 | |
| 2710 | static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2711 | u32 flags) |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2712 | { |
| 2713 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 2714 | const struct pr_ops *ops; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2715 | fmode_t mode; |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2716 | int r; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2717 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2718 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2719 | if (r < 0) |
| 2720 | return r; |
| 2721 | |
| 2722 | ops = bdev->bd_disk->fops->pr_ops; |
| 2723 | if (ops && ops->pr_reserve) |
| 2724 | r = ops->pr_reserve(bdev, key, type, flags); |
| 2725 | else |
| 2726 | r = -EOPNOTSUPP; |
| 2727 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2728 | bdput(bdev); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2729 | return r; |
| 2730 | } |
| 2731 | |
| 2732 | static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type) |
| 2733 | { |
| 2734 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 2735 | const struct pr_ops *ops; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2736 | fmode_t mode; |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2737 | int r; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2738 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2739 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2740 | if (r < 0) |
| 2741 | return r; |
| 2742 | |
| 2743 | ops = bdev->bd_disk->fops->pr_ops; |
| 2744 | if (ops && ops->pr_release) |
| 2745 | r = ops->pr_release(bdev, key, type); |
| 2746 | else |
| 2747 | r = -EOPNOTSUPP; |
| 2748 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2749 | bdput(bdev); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2750 | return r; |
| 2751 | } |
| 2752 | |
| 2753 | static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2754 | enum pr_type type, bool abort) |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2755 | { |
| 2756 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 2757 | const struct pr_ops *ops; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2758 | fmode_t mode; |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2759 | int r; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2760 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2761 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2762 | if (r < 0) |
| 2763 | return r; |
| 2764 | |
| 2765 | ops = bdev->bd_disk->fops->pr_ops; |
| 2766 | if (ops && ops->pr_preempt) |
| 2767 | r = ops->pr_preempt(bdev, old_key, new_key, type, abort); |
| 2768 | else |
| 2769 | r = -EOPNOTSUPP; |
| 2770 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2771 | bdput(bdev); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2772 | return r; |
| 2773 | } |
| 2774 | |
| 2775 | static int dm_pr_clear(struct block_device *bdev, u64 key) |
| 2776 | { |
| 2777 | struct mapped_device *md = bdev->bd_disk->private_data; |
| 2778 | const struct pr_ops *ops; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2779 | fmode_t mode; |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2780 | int r; |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2781 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2782 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2783 | if (r < 0) |
| 2784 | return r; |
| 2785 | |
| 2786 | ops = bdev->bd_disk->fops->pr_ops; |
| 2787 | if (ops && ops->pr_clear) |
| 2788 | r = ops->pr_clear(bdev, key); |
| 2789 | else |
| 2790 | r = -EOPNOTSUPP; |
| 2791 | |
Mike Snitzer | 956a402 | 2016-02-18 16:13:51 -0500 | [diff] [blame] | 2792 | bdput(bdev); |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2793 | return r; |
| 2794 | } |
| 2795 | |
| 2796 | static const struct pr_ops dm_pr_ops = { |
| 2797 | .pr_register = dm_pr_register, |
| 2798 | .pr_reserve = dm_pr_reserve, |
| 2799 | .pr_release = dm_pr_release, |
| 2800 | .pr_preempt = dm_pr_preempt, |
| 2801 | .pr_clear = dm_pr_clear, |
| 2802 | }; |
| 2803 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 2804 | static const struct block_device_operations dm_blk_dops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2805 | .open = dm_blk_open, |
| 2806 | .release = dm_blk_close, |
Milan Broz | aa129a2 | 2006-10-03 01:15:15 -0700 | [diff] [blame] | 2807 | .ioctl = dm_blk_ioctl, |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 2808 | .direct_access = dm_blk_direct_access, |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 2809 | .getgeo = dm_blk_getgeo, |
Christoph Hellwig | 71cdb69 | 2015-10-15 14:10:51 +0200 | [diff] [blame] | 2810 | .pr_ops = &dm_pr_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2811 | .owner = THIS_MODULE |
| 2812 | }; |
| 2813 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2814 | /* |
| 2815 | * module hooks |
| 2816 | */ |
| 2817 | module_init(dm_init); |
| 2818 | module_exit(dm_exit); |
| 2819 | |
| 2820 | module_param(major, uint, 0); |
| 2821 | MODULE_PARM_DESC(major, "The major number of the device mapper"); |
Mike Snitzer | f479082 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 2822 | |
Mike Snitzer | e860313 | 2013-09-12 18:06:12 -0400 | [diff] [blame] | 2823 | module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR); |
| 2824 | MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); |
| 2825 | |
Mike Snitzer | 115485e | 2016-02-22 12:16:21 -0500 | [diff] [blame] | 2826 | module_param(dm_numa_node, int, S_IRUGO | S_IWUSR); |
| 2827 | MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations"); |
| 2828 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2829 | MODULE_DESCRIPTION(DM_NAME " driver"); |
| 2830 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); |
| 2831 | MODULE_LICENSE("GPL"); |