Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1 | /* |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2 | * Copyright (C) 2011-2012 Red Hat UK. |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3 | * |
| 4 | * This file is released under the GPL. |
| 5 | */ |
| 6 | |
| 7 | #include "dm-thin-metadata.h" |
Mike Snitzer | 4f81a41 | 2012-10-12 21:02:13 +0100 | [diff] [blame] | 8 | #include "dm-bio-prison.h" |
Alasdair G Kergon | 1f4e0ff | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 9 | #include "dm.h" |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 10 | |
| 11 | #include <linux/device-mapper.h> |
| 12 | #include <linux/dm-io.h> |
| 13 | #include <linux/dm-kcopyd.h> |
| 14 | #include <linux/list.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/slab.h> |
| 18 | |
| 19 | #define DM_MSG_PREFIX "thin" |
| 20 | |
| 21 | /* |
| 22 | * Tunable constants |
| 23 | */ |
Alasdair G Kergon | 7768ed3 | 2012-07-27 15:07:57 +0100 | [diff] [blame] | 24 | #define ENDIO_HOOK_POOL_SIZE 1024 |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 25 | #define MAPPING_POOL_SIZE 1024 |
| 26 | #define PRISON_CELLS 1024 |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 27 | #define COMMIT_PERIOD HZ |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 28 | |
Mikulas Patocka | df5d2e9 | 2013-03-01 22:45:49 +0000 | [diff] [blame] | 29 | DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(snapshot_copy_throttle, |
| 30 | "A percentage of time allocated for copy on write"); |
| 31 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 32 | /* |
| 33 | * The block size of the device holding pool data must be |
| 34 | * between 64KB and 1GB. |
| 35 | */ |
| 36 | #define DATA_DEV_BLOCK_SIZE_MIN_SECTORS (64 * 1024 >> SECTOR_SHIFT) |
| 37 | #define DATA_DEV_BLOCK_SIZE_MAX_SECTORS (1024 * 1024 * 1024 >> SECTOR_SHIFT) |
| 38 | |
| 39 | /* |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 40 | * Device id is restricted to 24 bits. |
| 41 | */ |
| 42 | #define MAX_DEV_ID ((1 << 24) - 1) |
| 43 | |
| 44 | /* |
| 45 | * How do we handle breaking sharing of data blocks? |
| 46 | * ================================================= |
| 47 | * |
| 48 | * We use a standard copy-on-write btree to store the mappings for the |
| 49 | * devices (note I'm talking about copy-on-write of the metadata here, not |
| 50 | * the data). When you take an internal snapshot you clone the root node |
| 51 | * of the origin btree. After this there is no concept of an origin or a |
| 52 | * snapshot. They are just two device trees that happen to point to the |
| 53 | * same data blocks. |
| 54 | * |
| 55 | * When we get a write in we decide if it's to a shared data block using |
| 56 | * some timestamp magic. If it is, we have to break sharing. |
| 57 | * |
| 58 | * Let's say we write to a shared block in what was the origin. The |
| 59 | * steps are: |
| 60 | * |
| 61 | * i) plug io further to this physical block. (see bio_prison code). |
| 62 | * |
| 63 | * ii) quiesce any read io to that shared data block. Obviously |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 64 | * including all devices that share this block. (see dm_deferred_set code) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 65 | * |
| 66 | * iii) copy the data block to a newly allocate block. This step can be |
| 67 | * missed out if the io covers the block. (schedule_copy). |
| 68 | * |
| 69 | * iv) insert the new mapping into the origin's btree |
Joe Thornber | fe878f3 | 2012-03-28 18:41:24 +0100 | [diff] [blame] | 70 | * (process_prepared_mapping). This act of inserting breaks some |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 71 | * sharing of btree nodes between the two devices. Breaking sharing only |
| 72 | * effects the btree of that specific device. Btrees for the other |
| 73 | * devices that share the block never change. The btree for the origin |
| 74 | * device as it was after the last commit is untouched, ie. we're using |
| 75 | * persistent data structures in the functional programming sense. |
| 76 | * |
| 77 | * v) unplug io to this physical block, including the io that triggered |
| 78 | * the breaking of sharing. |
| 79 | * |
| 80 | * Steps (ii) and (iii) occur in parallel. |
| 81 | * |
| 82 | * The metadata _doesn't_ need to be committed before the io continues. We |
| 83 | * get away with this because the io is always written to a _new_ block. |
| 84 | * If there's a crash, then: |
| 85 | * |
| 86 | * - The origin mapping will point to the old origin block (the shared |
| 87 | * one). This will contain the data as it was before the io that triggered |
| 88 | * the breaking of sharing came in. |
| 89 | * |
| 90 | * - The snap mapping still points to the old block. As it would after |
| 91 | * the commit. |
| 92 | * |
| 93 | * The downside of this scheme is the timestamp magic isn't perfect, and |
| 94 | * will continue to think that data block in the snapshot device is shared |
| 95 | * even after the write to the origin has broken sharing. I suspect data |
| 96 | * blocks will typically be shared by many different devices, so we're |
| 97 | * breaking sharing n + 1 times, rather than n, where n is the number of |
| 98 | * devices that reference this data block. At the moment I think the |
| 99 | * benefits far, far outweigh the disadvantages. |
| 100 | */ |
| 101 | |
| 102 | /*----------------------------------------------------------------*/ |
| 103 | |
| 104 | /* |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 105 | * Key building. |
| 106 | */ |
| 107 | static void build_data_key(struct dm_thin_device *td, |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 108 | dm_block_t b, struct dm_cell_key *key) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 109 | { |
| 110 | key->virtual = 0; |
| 111 | key->dev = dm_thin_dev_id(td); |
| 112 | key->block = b; |
| 113 | } |
| 114 | |
| 115 | static void build_virtual_key(struct dm_thin_device *td, dm_block_t b, |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 116 | struct dm_cell_key *key) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 117 | { |
| 118 | key->virtual = 1; |
| 119 | key->dev = dm_thin_dev_id(td); |
| 120 | key->block = b; |
| 121 | } |
| 122 | |
| 123 | /*----------------------------------------------------------------*/ |
| 124 | |
| 125 | /* |
| 126 | * A pool device ties together a metadata device and a data device. It |
| 127 | * also provides the interface for creating and destroying internal |
| 128 | * devices. |
| 129 | */ |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 130 | struct dm_thin_new_mapping; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 131 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 132 | /* |
| 133 | * The pool runs in 3 modes. Ordered in degraded order for comparisons. |
| 134 | */ |
| 135 | enum pool_mode { |
| 136 | PM_WRITE, /* metadata may be changed */ |
| 137 | PM_READ_ONLY, /* metadata may not be changed */ |
| 138 | PM_FAIL, /* all I/O fails */ |
| 139 | }; |
| 140 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 141 | struct pool_features { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 142 | enum pool_mode mode; |
| 143 | |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 144 | bool zero_new_blocks:1; |
| 145 | bool discard_enabled:1; |
| 146 | bool discard_passdown:1; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 147 | }; |
| 148 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 149 | struct thin_c; |
| 150 | typedef void (*process_bio_fn)(struct thin_c *tc, struct bio *bio); |
| 151 | typedef void (*process_mapping_fn)(struct dm_thin_new_mapping *m); |
| 152 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 153 | struct pool { |
| 154 | struct list_head list; |
| 155 | struct dm_target *ti; /* Only set if a pool target is bound */ |
| 156 | |
| 157 | struct mapped_device *pool_md; |
| 158 | struct block_device *md_dev; |
| 159 | struct dm_pool_metadata *pmd; |
| 160 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 161 | dm_block_t low_water_blocks; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 162 | uint32_t sectors_per_block; |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 163 | int sectors_per_block_shift; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 164 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 165 | struct pool_features pf; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 166 | unsigned low_water_triggered:1; /* A dm event has been sent */ |
| 167 | unsigned no_free_space:1; /* A -ENOSPC warning has been issued */ |
| 168 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 169 | struct dm_bio_prison *prison; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 170 | struct dm_kcopyd_client *copier; |
| 171 | |
| 172 | struct workqueue_struct *wq; |
| 173 | struct work_struct worker; |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 174 | struct delayed_work waker; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 175 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 176 | unsigned long last_commit_jiffies; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 177 | unsigned ref_count; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 178 | |
| 179 | spinlock_t lock; |
| 180 | struct bio_list deferred_bios; |
| 181 | struct bio_list deferred_flush_bios; |
| 182 | struct list_head prepared_mappings; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 183 | struct list_head prepared_discards; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 184 | |
| 185 | struct bio_list retry_on_resume_list; |
| 186 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 187 | struct dm_deferred_set *shared_read_ds; |
| 188 | struct dm_deferred_set *all_io_ds; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 189 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 190 | struct dm_thin_new_mapping *next_mapping; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 191 | mempool_t *mapping_pool; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 192 | |
| 193 | process_bio_fn process_bio; |
| 194 | process_bio_fn process_discard; |
| 195 | |
| 196 | process_mapping_fn process_prepared_mapping; |
| 197 | process_mapping_fn process_prepared_discard; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 198 | }; |
| 199 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 200 | static enum pool_mode get_pool_mode(struct pool *pool); |
| 201 | static void set_pool_mode(struct pool *pool, enum pool_mode mode); |
| 202 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 203 | /* |
| 204 | * Target context for a pool. |
| 205 | */ |
| 206 | struct pool_c { |
| 207 | struct dm_target *ti; |
| 208 | struct pool *pool; |
| 209 | struct dm_dev *data_dev; |
| 210 | struct dm_dev *metadata_dev; |
| 211 | struct dm_target_callbacks callbacks; |
| 212 | |
| 213 | dm_block_t low_water_blocks; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 214 | struct pool_features requested_pf; /* Features requested during table load */ |
| 215 | struct pool_features adjusted_pf; /* Features used after adjusting for constituent devices */ |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 216 | }; |
| 217 | |
| 218 | /* |
| 219 | * Target context for a thin. |
| 220 | */ |
| 221 | struct thin_c { |
| 222 | struct dm_dev *pool_dev; |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 223 | struct dm_dev *origin_dev; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 224 | dm_thin_id dev_id; |
| 225 | |
| 226 | struct pool *pool; |
| 227 | struct dm_thin_device *td; |
| 228 | }; |
| 229 | |
| 230 | /*----------------------------------------------------------------*/ |
| 231 | |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 232 | static int bio_detain(struct pool *pool, struct dm_cell_key *key, struct bio *bio, |
| 233 | struct dm_bio_prison_cell **cell_result) |
| 234 | { |
| 235 | int r; |
| 236 | struct dm_bio_prison_cell *cell_prealloc; |
| 237 | |
| 238 | /* |
| 239 | * Allocate a cell from the prison's mempool. |
| 240 | * This might block but it can't fail. |
| 241 | */ |
| 242 | cell_prealloc = dm_bio_prison_alloc_cell(pool->prison, GFP_NOIO); |
| 243 | |
| 244 | r = dm_bio_detain(pool->prison, key, bio, cell_prealloc, cell_result); |
| 245 | if (r) |
| 246 | /* |
| 247 | * We reused an old cell; we can get rid of |
| 248 | * the new one. |
| 249 | */ |
| 250 | dm_bio_prison_free_cell(pool->prison, cell_prealloc); |
| 251 | |
| 252 | return r; |
| 253 | } |
| 254 | |
| 255 | static void cell_release(struct pool *pool, |
| 256 | struct dm_bio_prison_cell *cell, |
| 257 | struct bio_list *bios) |
| 258 | { |
| 259 | dm_cell_release(pool->prison, cell, bios); |
| 260 | dm_bio_prison_free_cell(pool->prison, cell); |
| 261 | } |
| 262 | |
| 263 | static void cell_release_no_holder(struct pool *pool, |
| 264 | struct dm_bio_prison_cell *cell, |
| 265 | struct bio_list *bios) |
| 266 | { |
| 267 | dm_cell_release_no_holder(pool->prison, cell, bios); |
| 268 | dm_bio_prison_free_cell(pool->prison, cell); |
| 269 | } |
| 270 | |
| 271 | static void cell_error(struct pool *pool, |
| 272 | struct dm_bio_prison_cell *cell) |
| 273 | { |
| 274 | dm_cell_error(pool->prison, cell); |
| 275 | dm_bio_prison_free_cell(pool->prison, cell); |
| 276 | } |
| 277 | |
| 278 | /*----------------------------------------------------------------*/ |
| 279 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 280 | /* |
| 281 | * A global list of pools that uses a struct mapped_device as a key. |
| 282 | */ |
| 283 | static struct dm_thin_pool_table { |
| 284 | struct mutex mutex; |
| 285 | struct list_head pools; |
| 286 | } dm_thin_pool_table; |
| 287 | |
| 288 | static void pool_table_init(void) |
| 289 | { |
| 290 | mutex_init(&dm_thin_pool_table.mutex); |
| 291 | INIT_LIST_HEAD(&dm_thin_pool_table.pools); |
| 292 | } |
| 293 | |
| 294 | static void __pool_table_insert(struct pool *pool) |
| 295 | { |
| 296 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 297 | list_add(&pool->list, &dm_thin_pool_table.pools); |
| 298 | } |
| 299 | |
| 300 | static void __pool_table_remove(struct pool *pool) |
| 301 | { |
| 302 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 303 | list_del(&pool->list); |
| 304 | } |
| 305 | |
| 306 | static struct pool *__pool_table_lookup(struct mapped_device *md) |
| 307 | { |
| 308 | struct pool *pool = NULL, *tmp; |
| 309 | |
| 310 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 311 | |
| 312 | list_for_each_entry(tmp, &dm_thin_pool_table.pools, list) { |
| 313 | if (tmp->pool_md == md) { |
| 314 | pool = tmp; |
| 315 | break; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | return pool; |
| 320 | } |
| 321 | |
| 322 | static struct pool *__pool_table_lookup_metadata_dev(struct block_device *md_dev) |
| 323 | { |
| 324 | struct pool *pool = NULL, *tmp; |
| 325 | |
| 326 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 327 | |
| 328 | list_for_each_entry(tmp, &dm_thin_pool_table.pools, list) { |
| 329 | if (tmp->md_dev == md_dev) { |
| 330 | pool = tmp; |
| 331 | break; |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | return pool; |
| 336 | } |
| 337 | |
| 338 | /*----------------------------------------------------------------*/ |
| 339 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 340 | struct dm_thin_endio_hook { |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 341 | struct thin_c *tc; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 342 | struct dm_deferred_entry *shared_read_entry; |
| 343 | struct dm_deferred_entry *all_io_entry; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 344 | struct dm_thin_new_mapping *overwrite_mapping; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 345 | }; |
| 346 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 347 | static void __requeue_bio_list(struct thin_c *tc, struct bio_list *master) |
| 348 | { |
| 349 | struct bio *bio; |
| 350 | struct bio_list bios; |
| 351 | |
| 352 | bio_list_init(&bios); |
| 353 | bio_list_merge(&bios, master); |
| 354 | bio_list_init(master); |
| 355 | |
| 356 | while ((bio = bio_list_pop(&bios))) { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 357 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 358 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 359 | if (h->tc == tc) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 360 | bio_endio(bio, DM_ENDIO_REQUEUE); |
| 361 | else |
| 362 | bio_list_add(master, bio); |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | static void requeue_io(struct thin_c *tc) |
| 367 | { |
| 368 | struct pool *pool = tc->pool; |
| 369 | unsigned long flags; |
| 370 | |
| 371 | spin_lock_irqsave(&pool->lock, flags); |
| 372 | __requeue_bio_list(tc, &pool->deferred_bios); |
| 373 | __requeue_bio_list(tc, &pool->retry_on_resume_list); |
| 374 | spin_unlock_irqrestore(&pool->lock, flags); |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * This section of code contains the logic for processing a thin device's IO. |
| 379 | * Much of the code depends on pool object resources (lists, workqueues, etc) |
| 380 | * but most is exclusively called from the thin target rather than the thin-pool |
| 381 | * target. |
| 382 | */ |
| 383 | |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 384 | static bool block_size_is_power_of_two(struct pool *pool) |
| 385 | { |
| 386 | return pool->sectors_per_block_shift >= 0; |
| 387 | } |
| 388 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 389 | static dm_block_t get_bio_block(struct thin_c *tc, struct bio *bio) |
| 390 | { |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 391 | struct pool *pool = tc->pool; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 392 | sector_t block_nr = bio->bi_sector; |
| 393 | |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 394 | if (block_size_is_power_of_two(pool)) |
| 395 | block_nr >>= pool->sectors_per_block_shift; |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 396 | else |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 397 | (void) sector_div(block_nr, pool->sectors_per_block); |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 398 | |
| 399 | return block_nr; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | static void remap(struct thin_c *tc, struct bio *bio, dm_block_t block) |
| 403 | { |
| 404 | struct pool *pool = tc->pool; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 405 | sector_t bi_sector = bio->bi_sector; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 406 | |
| 407 | bio->bi_bdev = tc->pool_dev->bdev; |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 408 | if (block_size_is_power_of_two(pool)) |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 409 | bio->bi_sector = (block << pool->sectors_per_block_shift) | |
| 410 | (bi_sector & (pool->sectors_per_block - 1)); |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 411 | else |
| 412 | bio->bi_sector = (block * pool->sectors_per_block) + |
| 413 | sector_div(bi_sector, pool->sectors_per_block); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 414 | } |
| 415 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 416 | static void remap_to_origin(struct thin_c *tc, struct bio *bio) |
| 417 | { |
| 418 | bio->bi_bdev = tc->origin_dev->bdev; |
| 419 | } |
| 420 | |
Joe Thornber | 4afdd68 | 2012-07-27 15:08:14 +0100 | [diff] [blame] | 421 | static int bio_triggers_commit(struct thin_c *tc, struct bio *bio) |
| 422 | { |
| 423 | return (bio->bi_rw & (REQ_FLUSH | REQ_FUA)) && |
| 424 | dm_thin_changed_this_transaction(tc->td); |
| 425 | } |
| 426 | |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 427 | static void inc_all_io_entry(struct pool *pool, struct bio *bio) |
| 428 | { |
| 429 | struct dm_thin_endio_hook *h; |
| 430 | |
| 431 | if (bio->bi_rw & REQ_DISCARD) |
| 432 | return; |
| 433 | |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 434 | h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 435 | h->all_io_entry = dm_deferred_entry_inc(pool->all_io_ds); |
| 436 | } |
| 437 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 438 | static void issue(struct thin_c *tc, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 439 | { |
| 440 | struct pool *pool = tc->pool; |
| 441 | unsigned long flags; |
| 442 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 443 | if (!bio_triggers_commit(tc, bio)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 444 | generic_make_request(bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 445 | return; |
| 446 | } |
| 447 | |
| 448 | /* |
| 449 | * Complete bio with an error if earlier I/O caused changes to |
| 450 | * the metadata that can't be committed e.g, due to I/O errors |
| 451 | * on the metadata device. |
| 452 | */ |
| 453 | if (dm_thin_aborted_changes(tc->td)) { |
| 454 | bio_io_error(bio); |
| 455 | return; |
| 456 | } |
| 457 | |
| 458 | /* |
| 459 | * Batch together any bios that trigger commits and then issue a |
| 460 | * single commit for them in process_deferred_bios(). |
| 461 | */ |
| 462 | spin_lock_irqsave(&pool->lock, flags); |
| 463 | bio_list_add(&pool->deferred_flush_bios, bio); |
| 464 | spin_unlock_irqrestore(&pool->lock, flags); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 465 | } |
| 466 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 467 | static void remap_to_origin_and_issue(struct thin_c *tc, struct bio *bio) |
| 468 | { |
| 469 | remap_to_origin(tc, bio); |
| 470 | issue(tc, bio); |
| 471 | } |
| 472 | |
| 473 | static void remap_and_issue(struct thin_c *tc, struct bio *bio, |
| 474 | dm_block_t block) |
| 475 | { |
| 476 | remap(tc, bio, block); |
| 477 | issue(tc, bio); |
| 478 | } |
| 479 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 480 | /* |
| 481 | * wake_worker() is used when new work is queued and when pool_resume is |
| 482 | * ready to continue deferred IO processing. |
| 483 | */ |
| 484 | static void wake_worker(struct pool *pool) |
| 485 | { |
| 486 | queue_work(pool->wq, &pool->worker); |
| 487 | } |
| 488 | |
| 489 | /*----------------------------------------------------------------*/ |
| 490 | |
| 491 | /* |
| 492 | * Bio endio functions. |
| 493 | */ |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 494 | struct dm_thin_new_mapping { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 495 | struct list_head list; |
| 496 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 497 | unsigned quiesced:1; |
| 498 | unsigned prepared:1; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 499 | unsigned pass_discard:1; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 500 | |
| 501 | struct thin_c *tc; |
| 502 | dm_block_t virt_block; |
| 503 | dm_block_t data_block; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 504 | struct dm_bio_prison_cell *cell, *cell2; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 505 | int err; |
| 506 | |
| 507 | /* |
| 508 | * If the bio covers the whole area of a block then we can avoid |
| 509 | * zeroing or copying. Instead this bio is hooked. The bio will |
| 510 | * still be in the cell, so care has to be taken to avoid issuing |
| 511 | * the bio twice. |
| 512 | */ |
| 513 | struct bio *bio; |
| 514 | bio_end_io_t *saved_bi_end_io; |
| 515 | }; |
| 516 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 517 | static void __maybe_add_mapping(struct dm_thin_new_mapping *m) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 518 | { |
| 519 | struct pool *pool = m->tc->pool; |
| 520 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 521 | if (m->quiesced && m->prepared) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 522 | list_add(&m->list, &pool->prepared_mappings); |
| 523 | wake_worker(pool); |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | static void copy_complete(int read_err, unsigned long write_err, void *context) |
| 528 | { |
| 529 | unsigned long flags; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 530 | struct dm_thin_new_mapping *m = context; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 531 | struct pool *pool = m->tc->pool; |
| 532 | |
| 533 | m->err = read_err || write_err ? -EIO : 0; |
| 534 | |
| 535 | spin_lock_irqsave(&pool->lock, flags); |
| 536 | m->prepared = 1; |
| 537 | __maybe_add_mapping(m); |
| 538 | spin_unlock_irqrestore(&pool->lock, flags); |
| 539 | } |
| 540 | |
| 541 | static void overwrite_endio(struct bio *bio, int err) |
| 542 | { |
| 543 | unsigned long flags; |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 544 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 545 | struct dm_thin_new_mapping *m = h->overwrite_mapping; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 546 | struct pool *pool = m->tc->pool; |
| 547 | |
| 548 | m->err = err; |
| 549 | |
| 550 | spin_lock_irqsave(&pool->lock, flags); |
| 551 | m->prepared = 1; |
| 552 | __maybe_add_mapping(m); |
| 553 | spin_unlock_irqrestore(&pool->lock, flags); |
| 554 | } |
| 555 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 556 | /*----------------------------------------------------------------*/ |
| 557 | |
| 558 | /* |
| 559 | * Workqueue. |
| 560 | */ |
| 561 | |
| 562 | /* |
| 563 | * Prepared mapping jobs. |
| 564 | */ |
| 565 | |
| 566 | /* |
| 567 | * This sends the bios in the cell back to the deferred_bios list. |
| 568 | */ |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 569 | static void cell_defer(struct thin_c *tc, struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 570 | { |
| 571 | struct pool *pool = tc->pool; |
| 572 | unsigned long flags; |
| 573 | |
| 574 | spin_lock_irqsave(&pool->lock, flags); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 575 | cell_release(pool, cell, &pool->deferred_bios); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 576 | spin_unlock_irqrestore(&tc->pool->lock, flags); |
| 577 | |
| 578 | wake_worker(pool); |
| 579 | } |
| 580 | |
| 581 | /* |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 582 | * Same as cell_defer above, except it omits the original holder of the cell. |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 583 | */ |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 584 | static void cell_defer_no_holder(struct thin_c *tc, struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 585 | { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 586 | struct pool *pool = tc->pool; |
| 587 | unsigned long flags; |
| 588 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 589 | spin_lock_irqsave(&pool->lock, flags); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 590 | cell_release_no_holder(pool, cell, &pool->deferred_bios); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 591 | spin_unlock_irqrestore(&pool->lock, flags); |
| 592 | |
| 593 | wake_worker(pool); |
| 594 | } |
| 595 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 596 | static void process_prepared_mapping_fail(struct dm_thin_new_mapping *m) |
| 597 | { |
| 598 | if (m->bio) |
| 599 | m->bio->bi_end_io = m->saved_bi_end_io; |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 600 | cell_error(m->tc->pool, m->cell); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 601 | list_del(&m->list); |
| 602 | mempool_free(m, m->tc->pool->mapping_pool); |
| 603 | } |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 604 | static void process_prepared_mapping(struct dm_thin_new_mapping *m) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 605 | { |
| 606 | struct thin_c *tc = m->tc; |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 607 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 608 | struct bio *bio; |
| 609 | int r; |
| 610 | |
| 611 | bio = m->bio; |
| 612 | if (bio) |
| 613 | bio->bi_end_io = m->saved_bi_end_io; |
| 614 | |
| 615 | if (m->err) { |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 616 | cell_error(pool, m->cell); |
Joe Thornber | 905386f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 617 | goto out; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 618 | } |
| 619 | |
| 620 | /* |
| 621 | * Commit the prepared block into the mapping btree. |
| 622 | * Any I/O for this block arriving after this point will get |
| 623 | * remapped to it directly. |
| 624 | */ |
| 625 | r = dm_thin_insert_block(tc->td, m->virt_block, m->data_block); |
| 626 | if (r) { |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 627 | DMERR_LIMIT("dm_thin_insert_block() failed"); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 628 | cell_error(pool, m->cell); |
Joe Thornber | 905386f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 629 | goto out; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | /* |
| 633 | * Release any bios held while the block was being provisioned. |
| 634 | * If we are processing a write bio that completely covers the block, |
| 635 | * we already processed it so can ignore it now when processing |
| 636 | * the bios in the cell. |
| 637 | */ |
| 638 | if (bio) { |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 639 | cell_defer_no_holder(tc, m->cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 640 | bio_endio(bio, 0); |
| 641 | } else |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 642 | cell_defer(tc, m->cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 643 | |
Joe Thornber | 905386f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 644 | out: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 645 | list_del(&m->list); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 646 | mempool_free(m, pool->mapping_pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 647 | } |
| 648 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 649 | static void process_prepared_discard_fail(struct dm_thin_new_mapping *m) |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 650 | { |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 651 | struct thin_c *tc = m->tc; |
| 652 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 653 | bio_io_error(m->bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 654 | cell_defer_no_holder(tc, m->cell); |
| 655 | cell_defer_no_holder(tc, m->cell2); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 656 | mempool_free(m, tc->pool->mapping_pool); |
| 657 | } |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 658 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 659 | static void process_prepared_discard_passdown(struct dm_thin_new_mapping *m) |
| 660 | { |
| 661 | struct thin_c *tc = m->tc; |
| 662 | |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 663 | inc_all_io_entry(tc->pool, m->bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 664 | cell_defer_no_holder(tc, m->cell); |
| 665 | cell_defer_no_holder(tc, m->cell2); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 666 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 667 | if (m->pass_discard) |
| 668 | remap_and_issue(tc, m->bio, m->data_block); |
| 669 | else |
| 670 | bio_endio(m->bio, 0); |
| 671 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 672 | mempool_free(m, tc->pool->mapping_pool); |
| 673 | } |
| 674 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 675 | static void process_prepared_discard(struct dm_thin_new_mapping *m) |
| 676 | { |
| 677 | int r; |
| 678 | struct thin_c *tc = m->tc; |
| 679 | |
| 680 | r = dm_thin_remove_block(tc->td, m->virt_block); |
| 681 | if (r) |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 682 | DMERR_LIMIT("dm_thin_remove_block() failed"); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 683 | |
| 684 | process_prepared_discard_passdown(m); |
| 685 | } |
| 686 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 687 | static void process_prepared(struct pool *pool, struct list_head *head, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 688 | process_mapping_fn *fn) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 689 | { |
| 690 | unsigned long flags; |
| 691 | struct list_head maps; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 692 | struct dm_thin_new_mapping *m, *tmp; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 693 | |
| 694 | INIT_LIST_HEAD(&maps); |
| 695 | spin_lock_irqsave(&pool->lock, flags); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 696 | list_splice_init(head, &maps); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 697 | spin_unlock_irqrestore(&pool->lock, flags); |
| 698 | |
| 699 | list_for_each_entry_safe(m, tmp, &maps, list) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 700 | (*fn)(m); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | /* |
| 704 | * Deferred bio jobs. |
| 705 | */ |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 706 | static int io_overlaps_block(struct pool *pool, struct bio *bio) |
| 707 | { |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 708 | return bio->bi_size == (pool->sectors_per_block << SECTOR_SHIFT); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 709 | } |
| 710 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 711 | static int io_overwrites_block(struct pool *pool, struct bio *bio) |
| 712 | { |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 713 | return (bio_data_dir(bio) == WRITE) && |
| 714 | io_overlaps_block(pool, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 715 | } |
| 716 | |
| 717 | static void save_and_set_endio(struct bio *bio, bio_end_io_t **save, |
| 718 | bio_end_io_t *fn) |
| 719 | { |
| 720 | *save = bio->bi_end_io; |
| 721 | bio->bi_end_io = fn; |
| 722 | } |
| 723 | |
| 724 | static int ensure_next_mapping(struct pool *pool) |
| 725 | { |
| 726 | if (pool->next_mapping) |
| 727 | return 0; |
| 728 | |
| 729 | pool->next_mapping = mempool_alloc(pool->mapping_pool, GFP_ATOMIC); |
| 730 | |
| 731 | return pool->next_mapping ? 0 : -ENOMEM; |
| 732 | } |
| 733 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 734 | static struct dm_thin_new_mapping *get_next_mapping(struct pool *pool) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 735 | { |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 736 | struct dm_thin_new_mapping *r = pool->next_mapping; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 737 | |
| 738 | BUG_ON(!pool->next_mapping); |
| 739 | |
| 740 | pool->next_mapping = NULL; |
| 741 | |
| 742 | return r; |
| 743 | } |
| 744 | |
| 745 | static void schedule_copy(struct thin_c *tc, dm_block_t virt_block, |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 746 | struct dm_dev *origin, dm_block_t data_origin, |
| 747 | dm_block_t data_dest, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 748 | struct dm_bio_prison_cell *cell, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 749 | { |
| 750 | int r; |
| 751 | struct pool *pool = tc->pool; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 752 | struct dm_thin_new_mapping *m = get_next_mapping(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 753 | |
| 754 | INIT_LIST_HEAD(&m->list); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 755 | m->quiesced = 0; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 756 | m->prepared = 0; |
| 757 | m->tc = tc; |
| 758 | m->virt_block = virt_block; |
| 759 | m->data_block = data_dest; |
| 760 | m->cell = cell; |
| 761 | m->err = 0; |
| 762 | m->bio = NULL; |
| 763 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 764 | if (!dm_deferred_set_add_work(pool->shared_read_ds, &m->list)) |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 765 | m->quiesced = 1; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 766 | |
| 767 | /* |
| 768 | * IO to pool_dev remaps to the pool target's data_dev. |
| 769 | * |
| 770 | * If the whole block of data is being overwritten, we can issue the |
| 771 | * bio immediately. Otherwise we use kcopyd to clone the data first. |
| 772 | */ |
| 773 | if (io_overwrites_block(pool, bio)) { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 774 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 775 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 776 | h->overwrite_mapping = m; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 777 | m->bio = bio; |
| 778 | save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 779 | inc_all_io_entry(pool, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 780 | remap_and_issue(tc, bio, data_dest); |
| 781 | } else { |
| 782 | struct dm_io_region from, to; |
| 783 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 784 | from.bdev = origin->bdev; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 785 | from.sector = data_origin * pool->sectors_per_block; |
| 786 | from.count = pool->sectors_per_block; |
| 787 | |
| 788 | to.bdev = tc->pool_dev->bdev; |
| 789 | to.sector = data_dest * pool->sectors_per_block; |
| 790 | to.count = pool->sectors_per_block; |
| 791 | |
| 792 | r = dm_kcopyd_copy(pool->copier, &from, 1, &to, |
| 793 | 0, copy_complete, m); |
| 794 | if (r < 0) { |
| 795 | mempool_free(m, pool->mapping_pool); |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 796 | DMERR_LIMIT("dm_kcopyd_copy() failed"); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 797 | cell_error(pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 798 | } |
| 799 | } |
| 800 | } |
| 801 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 802 | static void schedule_internal_copy(struct thin_c *tc, dm_block_t virt_block, |
| 803 | dm_block_t data_origin, dm_block_t data_dest, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 804 | struct dm_bio_prison_cell *cell, struct bio *bio) |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 805 | { |
| 806 | schedule_copy(tc, virt_block, tc->pool_dev, |
| 807 | data_origin, data_dest, cell, bio); |
| 808 | } |
| 809 | |
| 810 | static void schedule_external_copy(struct thin_c *tc, dm_block_t virt_block, |
| 811 | dm_block_t data_dest, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 812 | struct dm_bio_prison_cell *cell, struct bio *bio) |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 813 | { |
| 814 | schedule_copy(tc, virt_block, tc->origin_dev, |
| 815 | virt_block, data_dest, cell, bio); |
| 816 | } |
| 817 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 818 | static void schedule_zero(struct thin_c *tc, dm_block_t virt_block, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 819 | dm_block_t data_block, struct dm_bio_prison_cell *cell, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 820 | struct bio *bio) |
| 821 | { |
| 822 | struct pool *pool = tc->pool; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 823 | struct dm_thin_new_mapping *m = get_next_mapping(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 824 | |
| 825 | INIT_LIST_HEAD(&m->list); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 826 | m->quiesced = 1; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 827 | m->prepared = 0; |
| 828 | m->tc = tc; |
| 829 | m->virt_block = virt_block; |
| 830 | m->data_block = data_block; |
| 831 | m->cell = cell; |
| 832 | m->err = 0; |
| 833 | m->bio = NULL; |
| 834 | |
| 835 | /* |
| 836 | * If the whole block of data is being overwritten or we are not |
| 837 | * zeroing pre-existing data, we can issue the bio immediately. |
| 838 | * Otherwise we use kcopyd to zero the data first. |
| 839 | */ |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 840 | if (!pool->pf.zero_new_blocks) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 841 | process_prepared_mapping(m); |
| 842 | |
| 843 | else if (io_overwrites_block(pool, bio)) { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 844 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 845 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 846 | h->overwrite_mapping = m; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 847 | m->bio = bio; |
| 848 | save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 849 | inc_all_io_entry(pool, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 850 | remap_and_issue(tc, bio, data_block); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 851 | } else { |
| 852 | int r; |
| 853 | struct dm_io_region to; |
| 854 | |
| 855 | to.bdev = tc->pool_dev->bdev; |
| 856 | to.sector = data_block * pool->sectors_per_block; |
| 857 | to.count = pool->sectors_per_block; |
| 858 | |
| 859 | r = dm_kcopyd_zero(pool->copier, 1, &to, 0, copy_complete, m); |
| 860 | if (r < 0) { |
| 861 | mempool_free(m, pool->mapping_pool); |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 862 | DMERR_LIMIT("dm_kcopyd_zero() failed"); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 863 | cell_error(pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 864 | } |
| 865 | } |
| 866 | } |
| 867 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 868 | static int commit(struct pool *pool) |
| 869 | { |
| 870 | int r; |
| 871 | |
| 872 | r = dm_pool_commit_metadata(pool->pmd); |
| 873 | if (r) |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 874 | DMERR_LIMIT("commit failed: error = %d", r); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 875 | |
| 876 | return r; |
| 877 | } |
| 878 | |
| 879 | /* |
| 880 | * A non-zero return indicates read_only or fail_io mode. |
| 881 | * Many callers don't care about the return value. |
| 882 | */ |
| 883 | static int commit_or_fallback(struct pool *pool) |
| 884 | { |
| 885 | int r; |
| 886 | |
| 887 | if (get_pool_mode(pool) != PM_WRITE) |
| 888 | return -EINVAL; |
| 889 | |
| 890 | r = commit(pool); |
| 891 | if (r) |
| 892 | set_pool_mode(pool, PM_READ_ONLY); |
| 893 | |
| 894 | return r; |
| 895 | } |
| 896 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 897 | static int alloc_data_block(struct thin_c *tc, dm_block_t *result) |
| 898 | { |
| 899 | int r; |
| 900 | dm_block_t free_blocks; |
| 901 | unsigned long flags; |
| 902 | struct pool *pool = tc->pool; |
| 903 | |
| 904 | r = dm_pool_get_free_block_count(pool->pmd, &free_blocks); |
| 905 | if (r) |
| 906 | return r; |
| 907 | |
| 908 | if (free_blocks <= pool->low_water_blocks && !pool->low_water_triggered) { |
| 909 | DMWARN("%s: reached low water mark, sending event.", |
| 910 | dm_device_name(pool->pool_md)); |
| 911 | spin_lock_irqsave(&pool->lock, flags); |
| 912 | pool->low_water_triggered = 1; |
| 913 | spin_unlock_irqrestore(&pool->lock, flags); |
| 914 | dm_table_event(pool->ti->table); |
| 915 | } |
| 916 | |
| 917 | if (!free_blocks) { |
| 918 | if (pool->no_free_space) |
| 919 | return -ENOSPC; |
| 920 | else { |
| 921 | /* |
| 922 | * Try to commit to see if that will free up some |
| 923 | * more space. |
| 924 | */ |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 925 | (void) commit_or_fallback(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 926 | |
| 927 | r = dm_pool_get_free_block_count(pool->pmd, &free_blocks); |
| 928 | if (r) |
| 929 | return r; |
| 930 | |
| 931 | /* |
| 932 | * If we still have no space we set a flag to avoid |
| 933 | * doing all this checking and return -ENOSPC. |
| 934 | */ |
| 935 | if (!free_blocks) { |
| 936 | DMWARN("%s: no free space available.", |
| 937 | dm_device_name(pool->pool_md)); |
| 938 | spin_lock_irqsave(&pool->lock, flags); |
| 939 | pool->no_free_space = 1; |
| 940 | spin_unlock_irqrestore(&pool->lock, flags); |
| 941 | return -ENOSPC; |
| 942 | } |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | r = dm_pool_alloc_data_block(pool->pmd, result); |
| 947 | if (r) |
| 948 | return r; |
| 949 | |
| 950 | return 0; |
| 951 | } |
| 952 | |
| 953 | /* |
| 954 | * If we have run out of space, queue bios until the device is |
| 955 | * resumed, presumably after having been reloaded with more space. |
| 956 | */ |
| 957 | static void retry_on_resume(struct bio *bio) |
| 958 | { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 959 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 960 | struct thin_c *tc = h->tc; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 961 | struct pool *pool = tc->pool; |
| 962 | unsigned long flags; |
| 963 | |
| 964 | spin_lock_irqsave(&pool->lock, flags); |
| 965 | bio_list_add(&pool->retry_on_resume_list, bio); |
| 966 | spin_unlock_irqrestore(&pool->lock, flags); |
| 967 | } |
| 968 | |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 969 | static void no_space(struct pool *pool, struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 970 | { |
| 971 | struct bio *bio; |
| 972 | struct bio_list bios; |
| 973 | |
| 974 | bio_list_init(&bios); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 975 | cell_release(pool, cell, &bios); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 976 | |
| 977 | while ((bio = bio_list_pop(&bios))) |
| 978 | retry_on_resume(bio); |
| 979 | } |
| 980 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 981 | static void process_discard(struct thin_c *tc, struct bio *bio) |
| 982 | { |
| 983 | int r; |
Mike Snitzer | c3a0ce2 | 2012-05-12 01:43:16 +0100 | [diff] [blame] | 984 | unsigned long flags; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 985 | struct pool *pool = tc->pool; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 986 | struct dm_bio_prison_cell *cell, *cell2; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 987 | struct dm_cell_key key, key2; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 988 | dm_block_t block = get_bio_block(tc, bio); |
| 989 | struct dm_thin_lookup_result lookup_result; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 990 | struct dm_thin_new_mapping *m; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 991 | |
| 992 | build_virtual_key(tc->td, block, &key); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 993 | if (bio_detain(tc->pool, &key, bio, &cell)) |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 994 | return; |
| 995 | |
| 996 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); |
| 997 | switch (r) { |
| 998 | case 0: |
| 999 | /* |
| 1000 | * Check nobody is fiddling with this pool block. This can |
| 1001 | * happen if someone's in the process of breaking sharing |
| 1002 | * on this block. |
| 1003 | */ |
| 1004 | build_data_key(tc->td, lookup_result.block, &key2); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1005 | if (bio_detain(tc->pool, &key2, bio, &cell2)) { |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1006 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1007 | break; |
| 1008 | } |
| 1009 | |
| 1010 | if (io_overlaps_block(pool, bio)) { |
| 1011 | /* |
| 1012 | * IO may still be going to the destination block. We must |
| 1013 | * quiesce before we can do the removal. |
| 1014 | */ |
| 1015 | m = get_next_mapping(pool); |
| 1016 | m->tc = tc; |
Mike Snitzer | 17b7d63 | 2012-07-27 15:07:57 +0100 | [diff] [blame] | 1017 | m->pass_discard = (!lookup_result.shared) && pool->pf.discard_passdown; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1018 | m->virt_block = block; |
| 1019 | m->data_block = lookup_result.block; |
| 1020 | m->cell = cell; |
| 1021 | m->cell2 = cell2; |
| 1022 | m->err = 0; |
| 1023 | m->bio = bio; |
| 1024 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1025 | if (!dm_deferred_set_add_work(pool->all_io_ds, &m->list)) { |
Mike Snitzer | c3a0ce2 | 2012-05-12 01:43:16 +0100 | [diff] [blame] | 1026 | spin_lock_irqsave(&pool->lock, flags); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1027 | list_add(&m->list, &pool->prepared_discards); |
Mike Snitzer | c3a0ce2 | 2012-05-12 01:43:16 +0100 | [diff] [blame] | 1028 | spin_unlock_irqrestore(&pool->lock, flags); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1029 | wake_worker(pool); |
| 1030 | } |
| 1031 | } else { |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1032 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1033 | cell_defer_no_holder(tc, cell); |
| 1034 | cell_defer_no_holder(tc, cell2); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1035 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1036 | /* |
Mikulas Patocka | 4929630 | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 1037 | * The DM core makes sure that the discard doesn't span |
| 1038 | * a block boundary. So we submit the discard of a |
| 1039 | * partial block appropriately. |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1040 | */ |
Mikulas Patocka | 650d2a0 | 2012-07-20 14:25:05 +0100 | [diff] [blame] | 1041 | if ((!lookup_result.shared) && pool->pf.discard_passdown) |
| 1042 | remap_and_issue(tc, bio, lookup_result.block); |
| 1043 | else |
| 1044 | bio_endio(bio, 0); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1045 | } |
| 1046 | break; |
| 1047 | |
| 1048 | case -ENODATA: |
| 1049 | /* |
| 1050 | * It isn't provisioned, just forget it. |
| 1051 | */ |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1052 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1053 | bio_endio(bio, 0); |
| 1054 | break; |
| 1055 | |
| 1056 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1057 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
| 1058 | __func__, r); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1059 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1060 | bio_io_error(bio); |
| 1061 | break; |
| 1062 | } |
| 1063 | } |
| 1064 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1065 | static void break_sharing(struct thin_c *tc, struct bio *bio, dm_block_t block, |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1066 | struct dm_cell_key *key, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1067 | struct dm_thin_lookup_result *lookup_result, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1068 | struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1069 | { |
| 1070 | int r; |
| 1071 | dm_block_t data_block; |
| 1072 | |
| 1073 | r = alloc_data_block(tc, &data_block); |
| 1074 | switch (r) { |
| 1075 | case 0: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1076 | schedule_internal_copy(tc, block, lookup_result->block, |
| 1077 | data_block, cell, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1078 | break; |
| 1079 | |
| 1080 | case -ENOSPC: |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1081 | no_space(tc->pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1082 | break; |
| 1083 | |
| 1084 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1085 | DMERR_LIMIT("%s: alloc_data_block() failed: error = %d", |
| 1086 | __func__, r); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1087 | cell_error(tc->pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1088 | break; |
| 1089 | } |
| 1090 | } |
| 1091 | |
| 1092 | static void process_shared_bio(struct thin_c *tc, struct bio *bio, |
| 1093 | dm_block_t block, |
| 1094 | struct dm_thin_lookup_result *lookup_result) |
| 1095 | { |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1096 | struct dm_bio_prison_cell *cell; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1097 | struct pool *pool = tc->pool; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1098 | struct dm_cell_key key; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1099 | |
| 1100 | /* |
| 1101 | * If cell is already occupied, then sharing is already in the process |
| 1102 | * of being broken so we have nothing further to do here. |
| 1103 | */ |
| 1104 | build_data_key(tc->td, lookup_result->block, &key); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1105 | if (bio_detain(pool, &key, bio, &cell)) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1106 | return; |
| 1107 | |
Joe Thornber | 6004970 | 2012-07-27 15:08:06 +0100 | [diff] [blame] | 1108 | if (bio_data_dir(bio) == WRITE && bio->bi_size) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1109 | break_sharing(tc, bio, block, &key, lookup_result, cell); |
| 1110 | else { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1111 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1112 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1113 | h->shared_read_entry = dm_deferred_entry_inc(pool->shared_read_ds); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1114 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1115 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1116 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1117 | remap_and_issue(tc, bio, lookup_result->block); |
| 1118 | } |
| 1119 | } |
| 1120 | |
| 1121 | static void provision_block(struct thin_c *tc, struct bio *bio, dm_block_t block, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1122 | struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1123 | { |
| 1124 | int r; |
| 1125 | dm_block_t data_block; |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1126 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1127 | |
| 1128 | /* |
| 1129 | * Remap empty bios (flushes) immediately, without provisioning. |
| 1130 | */ |
| 1131 | if (!bio->bi_size) { |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1132 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1133 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1134 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1135 | remap_and_issue(tc, bio, 0); |
| 1136 | return; |
| 1137 | } |
| 1138 | |
| 1139 | /* |
| 1140 | * Fill read bios with zeroes and complete them immediately. |
| 1141 | */ |
| 1142 | if (bio_data_dir(bio) == READ) { |
| 1143 | zero_fill_bio(bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1144 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1145 | bio_endio(bio, 0); |
| 1146 | return; |
| 1147 | } |
| 1148 | |
| 1149 | r = alloc_data_block(tc, &data_block); |
| 1150 | switch (r) { |
| 1151 | case 0: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1152 | if (tc->origin_dev) |
| 1153 | schedule_external_copy(tc, block, data_block, cell, bio); |
| 1154 | else |
| 1155 | schedule_zero(tc, block, data_block, cell, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1156 | break; |
| 1157 | |
| 1158 | case -ENOSPC: |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1159 | no_space(pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1160 | break; |
| 1161 | |
| 1162 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1163 | DMERR_LIMIT("%s: alloc_data_block() failed: error = %d", |
| 1164 | __func__, r); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1165 | set_pool_mode(pool, PM_READ_ONLY); |
| 1166 | cell_error(pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1167 | break; |
| 1168 | } |
| 1169 | } |
| 1170 | |
| 1171 | static void process_bio(struct thin_c *tc, struct bio *bio) |
| 1172 | { |
| 1173 | int r; |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1174 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1175 | dm_block_t block = get_bio_block(tc, bio); |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1176 | struct dm_bio_prison_cell *cell; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1177 | struct dm_cell_key key; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1178 | struct dm_thin_lookup_result lookup_result; |
| 1179 | |
| 1180 | /* |
| 1181 | * If cell is already occupied, then the block is already |
| 1182 | * being provisioned so we have nothing further to do here. |
| 1183 | */ |
| 1184 | build_virtual_key(tc->td, block, &key); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1185 | if (bio_detain(pool, &key, bio, &cell)) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1186 | return; |
| 1187 | |
| 1188 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); |
| 1189 | switch (r) { |
| 1190 | case 0: |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1191 | if (lookup_result.shared) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1192 | process_shared_bio(tc, bio, block, &lookup_result); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1193 | cell_defer_no_holder(tc, cell); /* FIXME: pass this cell into process_shared? */ |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1194 | } else { |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1195 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1196 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1197 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1198 | remap_and_issue(tc, bio, lookup_result.block); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1199 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1200 | break; |
| 1201 | |
| 1202 | case -ENODATA: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1203 | if (bio_data_dir(bio) == READ && tc->origin_dev) { |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1204 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1205 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1206 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1207 | remap_to_origin_and_issue(tc, bio); |
| 1208 | } else |
| 1209 | provision_block(tc, bio, block, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1210 | break; |
| 1211 | |
| 1212 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1213 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
| 1214 | __func__, r); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1215 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1216 | bio_io_error(bio); |
| 1217 | break; |
| 1218 | } |
| 1219 | } |
| 1220 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1221 | static void process_bio_read_only(struct thin_c *tc, struct bio *bio) |
| 1222 | { |
| 1223 | int r; |
| 1224 | int rw = bio_data_dir(bio); |
| 1225 | dm_block_t block = get_bio_block(tc, bio); |
| 1226 | struct dm_thin_lookup_result lookup_result; |
| 1227 | |
| 1228 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); |
| 1229 | switch (r) { |
| 1230 | case 0: |
| 1231 | if (lookup_result.shared && (rw == WRITE) && bio->bi_size) |
| 1232 | bio_io_error(bio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1233 | else { |
| 1234 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1235 | remap_and_issue(tc, bio, lookup_result.block); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1236 | } |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1237 | break; |
| 1238 | |
| 1239 | case -ENODATA: |
| 1240 | if (rw != READ) { |
| 1241 | bio_io_error(bio); |
| 1242 | break; |
| 1243 | } |
| 1244 | |
| 1245 | if (tc->origin_dev) { |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1246 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1247 | remap_to_origin_and_issue(tc, bio); |
| 1248 | break; |
| 1249 | } |
| 1250 | |
| 1251 | zero_fill_bio(bio); |
| 1252 | bio_endio(bio, 0); |
| 1253 | break; |
| 1254 | |
| 1255 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1256 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
| 1257 | __func__, r); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1258 | bio_io_error(bio); |
| 1259 | break; |
| 1260 | } |
| 1261 | } |
| 1262 | |
| 1263 | static void process_bio_fail(struct thin_c *tc, struct bio *bio) |
| 1264 | { |
| 1265 | bio_io_error(bio); |
| 1266 | } |
| 1267 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1268 | static int need_commit_due_to_time(struct pool *pool) |
| 1269 | { |
| 1270 | return jiffies < pool->last_commit_jiffies || |
| 1271 | jiffies > pool->last_commit_jiffies + COMMIT_PERIOD; |
| 1272 | } |
| 1273 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1274 | static void process_deferred_bios(struct pool *pool) |
| 1275 | { |
| 1276 | unsigned long flags; |
| 1277 | struct bio *bio; |
| 1278 | struct bio_list bios; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1279 | |
| 1280 | bio_list_init(&bios); |
| 1281 | |
| 1282 | spin_lock_irqsave(&pool->lock, flags); |
| 1283 | bio_list_merge(&bios, &pool->deferred_bios); |
| 1284 | bio_list_init(&pool->deferred_bios); |
| 1285 | spin_unlock_irqrestore(&pool->lock, flags); |
| 1286 | |
| 1287 | while ((bio = bio_list_pop(&bios))) { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1288 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1289 | struct thin_c *tc = h->tc; |
| 1290 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1291 | /* |
| 1292 | * If we've got no free new_mapping structs, and processing |
| 1293 | * this bio might require one, we pause until there are some |
| 1294 | * prepared mappings to process. |
| 1295 | */ |
| 1296 | if (ensure_next_mapping(pool)) { |
| 1297 | spin_lock_irqsave(&pool->lock, flags); |
| 1298 | bio_list_merge(&pool->deferred_bios, &bios); |
| 1299 | spin_unlock_irqrestore(&pool->lock, flags); |
| 1300 | |
| 1301 | break; |
| 1302 | } |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1303 | |
| 1304 | if (bio->bi_rw & REQ_DISCARD) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1305 | pool->process_discard(tc, bio); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1306 | else |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1307 | pool->process_bio(tc, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1308 | } |
| 1309 | |
| 1310 | /* |
| 1311 | * If there are any deferred flush bios, we must commit |
| 1312 | * the metadata before issuing them. |
| 1313 | */ |
| 1314 | bio_list_init(&bios); |
| 1315 | spin_lock_irqsave(&pool->lock, flags); |
| 1316 | bio_list_merge(&bios, &pool->deferred_flush_bios); |
| 1317 | bio_list_init(&pool->deferred_flush_bios); |
| 1318 | spin_unlock_irqrestore(&pool->lock, flags); |
| 1319 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1320 | if (bio_list_empty(&bios) && !need_commit_due_to_time(pool)) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1321 | return; |
| 1322 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1323 | if (commit_or_fallback(pool)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1324 | while ((bio = bio_list_pop(&bios))) |
| 1325 | bio_io_error(bio); |
| 1326 | return; |
| 1327 | } |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1328 | pool->last_commit_jiffies = jiffies; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1329 | |
| 1330 | while ((bio = bio_list_pop(&bios))) |
| 1331 | generic_make_request(bio); |
| 1332 | } |
| 1333 | |
| 1334 | static void do_worker(struct work_struct *ws) |
| 1335 | { |
| 1336 | struct pool *pool = container_of(ws, struct pool, worker); |
| 1337 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1338 | process_prepared(pool, &pool->prepared_mappings, &pool->process_prepared_mapping); |
| 1339 | process_prepared(pool, &pool->prepared_discards, &pool->process_prepared_discard); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1340 | process_deferred_bios(pool); |
| 1341 | } |
| 1342 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1343 | /* |
| 1344 | * We want to commit periodically so that not too much |
| 1345 | * unwritten data builds up. |
| 1346 | */ |
| 1347 | static void do_waker(struct work_struct *ws) |
| 1348 | { |
| 1349 | struct pool *pool = container_of(to_delayed_work(ws), struct pool, waker); |
| 1350 | wake_worker(pool); |
| 1351 | queue_delayed_work(pool->wq, &pool->waker, COMMIT_PERIOD); |
| 1352 | } |
| 1353 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1354 | /*----------------------------------------------------------------*/ |
| 1355 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1356 | static enum pool_mode get_pool_mode(struct pool *pool) |
| 1357 | { |
| 1358 | return pool->pf.mode; |
| 1359 | } |
| 1360 | |
| 1361 | static void set_pool_mode(struct pool *pool, enum pool_mode mode) |
| 1362 | { |
| 1363 | int r; |
| 1364 | |
| 1365 | pool->pf.mode = mode; |
| 1366 | |
| 1367 | switch (mode) { |
| 1368 | case PM_FAIL: |
| 1369 | DMERR("switching pool to failure mode"); |
| 1370 | pool->process_bio = process_bio_fail; |
| 1371 | pool->process_discard = process_bio_fail; |
| 1372 | pool->process_prepared_mapping = process_prepared_mapping_fail; |
| 1373 | pool->process_prepared_discard = process_prepared_discard_fail; |
| 1374 | break; |
| 1375 | |
| 1376 | case PM_READ_ONLY: |
| 1377 | DMERR("switching pool to read-only mode"); |
| 1378 | r = dm_pool_abort_metadata(pool->pmd); |
| 1379 | if (r) { |
| 1380 | DMERR("aborting transaction failed"); |
| 1381 | set_pool_mode(pool, PM_FAIL); |
| 1382 | } else { |
| 1383 | dm_pool_metadata_read_only(pool->pmd); |
| 1384 | pool->process_bio = process_bio_read_only; |
| 1385 | pool->process_discard = process_discard; |
| 1386 | pool->process_prepared_mapping = process_prepared_mapping_fail; |
| 1387 | pool->process_prepared_discard = process_prepared_discard_passdown; |
| 1388 | } |
| 1389 | break; |
| 1390 | |
| 1391 | case PM_WRITE: |
| 1392 | pool->process_bio = process_bio; |
| 1393 | pool->process_discard = process_discard; |
| 1394 | pool->process_prepared_mapping = process_prepared_mapping; |
| 1395 | pool->process_prepared_discard = process_prepared_discard; |
| 1396 | break; |
| 1397 | } |
| 1398 | } |
| 1399 | |
| 1400 | /*----------------------------------------------------------------*/ |
| 1401 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1402 | /* |
| 1403 | * Mapping functions. |
| 1404 | */ |
| 1405 | |
| 1406 | /* |
| 1407 | * Called only while mapping a thin bio to hand it over to the workqueue. |
| 1408 | */ |
| 1409 | static void thin_defer_bio(struct thin_c *tc, struct bio *bio) |
| 1410 | { |
| 1411 | unsigned long flags; |
| 1412 | struct pool *pool = tc->pool; |
| 1413 | |
| 1414 | spin_lock_irqsave(&pool->lock, flags); |
| 1415 | bio_list_add(&pool->deferred_bios, bio); |
| 1416 | spin_unlock_irqrestore(&pool->lock, flags); |
| 1417 | |
| 1418 | wake_worker(pool); |
| 1419 | } |
| 1420 | |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1421 | static void thin_hook_bio(struct thin_c *tc, struct bio *bio) |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1422 | { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1423 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1424 | |
| 1425 | h->tc = tc; |
| 1426 | h->shared_read_entry = NULL; |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1427 | h->all_io_entry = NULL; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1428 | h->overwrite_mapping = NULL; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1429 | } |
| 1430 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1431 | /* |
| 1432 | * Non-blocking function called from the thin target's map function. |
| 1433 | */ |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 1434 | static int thin_bio_map(struct dm_target *ti, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1435 | { |
| 1436 | int r; |
| 1437 | struct thin_c *tc = ti->private; |
| 1438 | dm_block_t block = get_bio_block(tc, bio); |
| 1439 | struct dm_thin_device *td = tc->td; |
| 1440 | struct dm_thin_lookup_result result; |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1441 | struct dm_bio_prison_cell *cell1, *cell2; |
| 1442 | struct dm_cell_key key; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1443 | |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1444 | thin_hook_bio(tc, bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1445 | |
| 1446 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
| 1447 | bio_io_error(bio); |
| 1448 | return DM_MAPIO_SUBMITTED; |
| 1449 | } |
| 1450 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1451 | if (bio->bi_rw & (REQ_DISCARD | REQ_FLUSH | REQ_FUA)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1452 | thin_defer_bio(tc, bio); |
| 1453 | return DM_MAPIO_SUBMITTED; |
| 1454 | } |
| 1455 | |
| 1456 | r = dm_thin_find_block(td, block, 0, &result); |
| 1457 | |
| 1458 | /* |
| 1459 | * Note that we defer readahead too. |
| 1460 | */ |
| 1461 | switch (r) { |
| 1462 | case 0: |
| 1463 | if (unlikely(result.shared)) { |
| 1464 | /* |
| 1465 | * We have a race condition here between the |
| 1466 | * result.shared value returned by the lookup and |
| 1467 | * snapshot creation, which may cause new |
| 1468 | * sharing. |
| 1469 | * |
| 1470 | * To avoid this always quiesce the origin before |
| 1471 | * taking the snap. You want to do this anyway to |
| 1472 | * ensure a consistent application view |
| 1473 | * (i.e. lockfs). |
| 1474 | * |
| 1475 | * More distant ancestors are irrelevant. The |
| 1476 | * shared flag will be set in their case. |
| 1477 | */ |
| 1478 | thin_defer_bio(tc, bio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1479 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1480 | } |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1481 | |
| 1482 | build_virtual_key(tc->td, block, &key); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1483 | if (bio_detain(tc->pool, &key, bio, &cell1)) |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1484 | return DM_MAPIO_SUBMITTED; |
| 1485 | |
| 1486 | build_data_key(tc->td, result.block, &key); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame^] | 1487 | if (bio_detain(tc->pool, &key, bio, &cell2)) { |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1488 | cell_defer_no_holder(tc, cell1); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1489 | return DM_MAPIO_SUBMITTED; |
| 1490 | } |
| 1491 | |
| 1492 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1493 | cell_defer_no_holder(tc, cell2); |
| 1494 | cell_defer_no_holder(tc, cell1); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1495 | |
| 1496 | remap(tc, bio, result.block); |
| 1497 | return DM_MAPIO_REMAPPED; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1498 | |
| 1499 | case -ENODATA: |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1500 | if (get_pool_mode(tc->pool) == PM_READ_ONLY) { |
| 1501 | /* |
| 1502 | * This block isn't provisioned, and we have no way |
| 1503 | * of doing so. Just error it. |
| 1504 | */ |
| 1505 | bio_io_error(bio); |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1506 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1507 | } |
| 1508 | /* fall through */ |
| 1509 | |
| 1510 | case -EWOULDBLOCK: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1511 | /* |
| 1512 | * In future, the failed dm_thin_find_block above could |
| 1513 | * provide the hint to load the metadata into cache. |
| 1514 | */ |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1515 | thin_defer_bio(tc, bio); |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1516 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1517 | |
| 1518 | default: |
| 1519 | /* |
| 1520 | * Must always call bio_io_error on failure. |
| 1521 | * dm_thin_find_block can fail with -EINVAL if the |
| 1522 | * pool is switched to fail-io mode. |
| 1523 | */ |
| 1524 | bio_io_error(bio); |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1525 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1526 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1527 | } |
| 1528 | |
| 1529 | static int pool_is_congested(struct dm_target_callbacks *cb, int bdi_bits) |
| 1530 | { |
| 1531 | int r; |
| 1532 | unsigned long flags; |
| 1533 | struct pool_c *pt = container_of(cb, struct pool_c, callbacks); |
| 1534 | |
| 1535 | spin_lock_irqsave(&pt->pool->lock, flags); |
| 1536 | r = !bio_list_empty(&pt->pool->retry_on_resume_list); |
| 1537 | spin_unlock_irqrestore(&pt->pool->lock, flags); |
| 1538 | |
| 1539 | if (!r) { |
| 1540 | struct request_queue *q = bdev_get_queue(pt->data_dev->bdev); |
| 1541 | r = bdi_congested(&q->backing_dev_info, bdi_bits); |
| 1542 | } |
| 1543 | |
| 1544 | return r; |
| 1545 | } |
| 1546 | |
| 1547 | static void __requeue_bios(struct pool *pool) |
| 1548 | { |
| 1549 | bio_list_merge(&pool->deferred_bios, &pool->retry_on_resume_list); |
| 1550 | bio_list_init(&pool->retry_on_resume_list); |
| 1551 | } |
| 1552 | |
| 1553 | /*---------------------------------------------------------------- |
| 1554 | * Binding of control targets to a pool object |
| 1555 | *--------------------------------------------------------------*/ |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1556 | static bool data_dev_supports_discard(struct pool_c *pt) |
| 1557 | { |
| 1558 | struct request_queue *q = bdev_get_queue(pt->data_dev->bdev); |
| 1559 | |
| 1560 | return q && blk_queue_discard(q); |
| 1561 | } |
| 1562 | |
| 1563 | /* |
| 1564 | * If discard_passdown was enabled verify that the data device |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1565 | * supports discards. Disable discard_passdown if not. |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1566 | */ |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1567 | static void disable_passdown_if_not_supported(struct pool_c *pt) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1568 | { |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1569 | struct pool *pool = pt->pool; |
| 1570 | struct block_device *data_bdev = pt->data_dev->bdev; |
| 1571 | struct queue_limits *data_limits = &bdev_get_queue(data_bdev)->limits; |
| 1572 | sector_t block_size = pool->sectors_per_block << SECTOR_SHIFT; |
| 1573 | const char *reason = NULL; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1574 | char buf[BDEVNAME_SIZE]; |
| 1575 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1576 | if (!pt->adjusted_pf.discard_passdown) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1577 | return; |
| 1578 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1579 | if (!data_dev_supports_discard(pt)) |
| 1580 | reason = "discard unsupported"; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1581 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1582 | else if (data_limits->max_discard_sectors < pool->sectors_per_block) |
| 1583 | reason = "max discard sectors smaller than a block"; |
| 1584 | |
| 1585 | else if (data_limits->discard_granularity > block_size) |
| 1586 | reason = "discard granularity larger than a block"; |
| 1587 | |
| 1588 | else if (block_size & (data_limits->discard_granularity - 1)) |
| 1589 | reason = "discard granularity not a factor of block size"; |
| 1590 | |
| 1591 | if (reason) { |
| 1592 | DMWARN("Data device (%s) %s: Disabling discard passdown.", bdevname(data_bdev, buf), reason); |
| 1593 | pt->adjusted_pf.discard_passdown = false; |
| 1594 | } |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1595 | } |
| 1596 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1597 | static int bind_control_target(struct pool *pool, struct dm_target *ti) |
| 1598 | { |
| 1599 | struct pool_c *pt = ti->private; |
| 1600 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1601 | /* |
| 1602 | * We want to make sure that degraded pools are never upgraded. |
| 1603 | */ |
| 1604 | enum pool_mode old_mode = pool->pf.mode; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1605 | enum pool_mode new_mode = pt->adjusted_pf.mode; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1606 | |
| 1607 | if (old_mode > new_mode) |
| 1608 | new_mode = old_mode; |
| 1609 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1610 | pool->ti = ti; |
| 1611 | pool->low_water_blocks = pt->low_water_blocks; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1612 | pool->pf = pt->adjusted_pf; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1613 | |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1614 | set_pool_mode(pool, new_mode); |
Mike Snitzer | f402693 | 2012-05-19 01:01:01 +0100 | [diff] [blame] | 1615 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1616 | return 0; |
| 1617 | } |
| 1618 | |
| 1619 | static void unbind_control_target(struct pool *pool, struct dm_target *ti) |
| 1620 | { |
| 1621 | if (pool->ti == ti) |
| 1622 | pool->ti = NULL; |
| 1623 | } |
| 1624 | |
| 1625 | /*---------------------------------------------------------------- |
| 1626 | * Pool creation |
| 1627 | *--------------------------------------------------------------*/ |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1628 | /* Initialize pool features. */ |
| 1629 | static void pool_features_init(struct pool_features *pf) |
| 1630 | { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1631 | pf->mode = PM_WRITE; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1632 | pf->zero_new_blocks = true; |
| 1633 | pf->discard_enabled = true; |
| 1634 | pf->discard_passdown = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1635 | } |
| 1636 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1637 | static void __pool_destroy(struct pool *pool) |
| 1638 | { |
| 1639 | __pool_table_remove(pool); |
| 1640 | |
| 1641 | if (dm_pool_metadata_close(pool->pmd) < 0) |
| 1642 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); |
| 1643 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1644 | dm_bio_prison_destroy(pool->prison); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1645 | dm_kcopyd_client_destroy(pool->copier); |
| 1646 | |
| 1647 | if (pool->wq) |
| 1648 | destroy_workqueue(pool->wq); |
| 1649 | |
| 1650 | if (pool->next_mapping) |
| 1651 | mempool_free(pool->next_mapping, pool->mapping_pool); |
| 1652 | mempool_destroy(pool->mapping_pool); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1653 | dm_deferred_set_destroy(pool->shared_read_ds); |
| 1654 | dm_deferred_set_destroy(pool->all_io_ds); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1655 | kfree(pool); |
| 1656 | } |
| 1657 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1658 | static struct kmem_cache *_new_mapping_cache; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1659 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1660 | static struct pool *pool_create(struct mapped_device *pool_md, |
| 1661 | struct block_device *metadata_dev, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1662 | unsigned long block_size, |
| 1663 | int read_only, char **error) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1664 | { |
| 1665 | int r; |
| 1666 | void *err_p; |
| 1667 | struct pool *pool; |
| 1668 | struct dm_pool_metadata *pmd; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1669 | bool format_device = read_only ? false : true; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1670 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1671 | pmd = dm_pool_metadata_open(metadata_dev, block_size, format_device); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1672 | if (IS_ERR(pmd)) { |
| 1673 | *error = "Error creating metadata object"; |
| 1674 | return (struct pool *)pmd; |
| 1675 | } |
| 1676 | |
| 1677 | pool = kmalloc(sizeof(*pool), GFP_KERNEL); |
| 1678 | if (!pool) { |
| 1679 | *error = "Error allocating memory for pool"; |
| 1680 | err_p = ERR_PTR(-ENOMEM); |
| 1681 | goto bad_pool; |
| 1682 | } |
| 1683 | |
| 1684 | pool->pmd = pmd; |
| 1685 | pool->sectors_per_block = block_size; |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 1686 | if (block_size & (block_size - 1)) |
| 1687 | pool->sectors_per_block_shift = -1; |
| 1688 | else |
| 1689 | pool->sectors_per_block_shift = __ffs(block_size); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1690 | pool->low_water_blocks = 0; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1691 | pool_features_init(&pool->pf); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1692 | pool->prison = dm_bio_prison_create(PRISON_CELLS); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1693 | if (!pool->prison) { |
| 1694 | *error = "Error creating pool's bio prison"; |
| 1695 | err_p = ERR_PTR(-ENOMEM); |
| 1696 | goto bad_prison; |
| 1697 | } |
| 1698 | |
Mikulas Patocka | df5d2e9 | 2013-03-01 22:45:49 +0000 | [diff] [blame] | 1699 | pool->copier = dm_kcopyd_client_create(&dm_kcopyd_throttle); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1700 | if (IS_ERR(pool->copier)) { |
| 1701 | r = PTR_ERR(pool->copier); |
| 1702 | *error = "Error creating pool's kcopyd client"; |
| 1703 | err_p = ERR_PTR(r); |
| 1704 | goto bad_kcopyd_client; |
| 1705 | } |
| 1706 | |
| 1707 | /* |
| 1708 | * Create singlethreaded workqueue that will service all devices |
| 1709 | * that use this metadata. |
| 1710 | */ |
| 1711 | pool->wq = alloc_ordered_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM); |
| 1712 | if (!pool->wq) { |
| 1713 | *error = "Error creating pool's workqueue"; |
| 1714 | err_p = ERR_PTR(-ENOMEM); |
| 1715 | goto bad_wq; |
| 1716 | } |
| 1717 | |
| 1718 | INIT_WORK(&pool->worker, do_worker); |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1719 | INIT_DELAYED_WORK(&pool->waker, do_waker); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1720 | spin_lock_init(&pool->lock); |
| 1721 | bio_list_init(&pool->deferred_bios); |
| 1722 | bio_list_init(&pool->deferred_flush_bios); |
| 1723 | INIT_LIST_HEAD(&pool->prepared_mappings); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1724 | INIT_LIST_HEAD(&pool->prepared_discards); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1725 | pool->low_water_triggered = 0; |
| 1726 | pool->no_free_space = 0; |
| 1727 | bio_list_init(&pool->retry_on_resume_list); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1728 | |
| 1729 | pool->shared_read_ds = dm_deferred_set_create(); |
| 1730 | if (!pool->shared_read_ds) { |
| 1731 | *error = "Error creating pool's shared read deferred set"; |
| 1732 | err_p = ERR_PTR(-ENOMEM); |
| 1733 | goto bad_shared_read_ds; |
| 1734 | } |
| 1735 | |
| 1736 | pool->all_io_ds = dm_deferred_set_create(); |
| 1737 | if (!pool->all_io_ds) { |
| 1738 | *error = "Error creating pool's all io deferred set"; |
| 1739 | err_p = ERR_PTR(-ENOMEM); |
| 1740 | goto bad_all_io_ds; |
| 1741 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1742 | |
| 1743 | pool->next_mapping = NULL; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1744 | pool->mapping_pool = mempool_create_slab_pool(MAPPING_POOL_SIZE, |
| 1745 | _new_mapping_cache); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1746 | if (!pool->mapping_pool) { |
| 1747 | *error = "Error creating pool's mapping mempool"; |
| 1748 | err_p = ERR_PTR(-ENOMEM); |
| 1749 | goto bad_mapping_pool; |
| 1750 | } |
| 1751 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1752 | pool->ref_count = 1; |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1753 | pool->last_commit_jiffies = jiffies; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1754 | pool->pool_md = pool_md; |
| 1755 | pool->md_dev = metadata_dev; |
| 1756 | __pool_table_insert(pool); |
| 1757 | |
| 1758 | return pool; |
| 1759 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1760 | bad_mapping_pool: |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1761 | dm_deferred_set_destroy(pool->all_io_ds); |
| 1762 | bad_all_io_ds: |
| 1763 | dm_deferred_set_destroy(pool->shared_read_ds); |
| 1764 | bad_shared_read_ds: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1765 | destroy_workqueue(pool->wq); |
| 1766 | bad_wq: |
| 1767 | dm_kcopyd_client_destroy(pool->copier); |
| 1768 | bad_kcopyd_client: |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1769 | dm_bio_prison_destroy(pool->prison); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1770 | bad_prison: |
| 1771 | kfree(pool); |
| 1772 | bad_pool: |
| 1773 | if (dm_pool_metadata_close(pmd)) |
| 1774 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); |
| 1775 | |
| 1776 | return err_p; |
| 1777 | } |
| 1778 | |
| 1779 | static void __pool_inc(struct pool *pool) |
| 1780 | { |
| 1781 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 1782 | pool->ref_count++; |
| 1783 | } |
| 1784 | |
| 1785 | static void __pool_dec(struct pool *pool) |
| 1786 | { |
| 1787 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 1788 | BUG_ON(!pool->ref_count); |
| 1789 | if (!--pool->ref_count) |
| 1790 | __pool_destroy(pool); |
| 1791 | } |
| 1792 | |
| 1793 | static struct pool *__pool_find(struct mapped_device *pool_md, |
| 1794 | struct block_device *metadata_dev, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1795 | unsigned long block_size, int read_only, |
| 1796 | char **error, int *created) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1797 | { |
| 1798 | struct pool *pool = __pool_table_lookup_metadata_dev(metadata_dev); |
| 1799 | |
| 1800 | if (pool) { |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 1801 | if (pool->pool_md != pool_md) { |
| 1802 | *error = "metadata device already in use by a pool"; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1803 | return ERR_PTR(-EBUSY); |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 1804 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1805 | __pool_inc(pool); |
| 1806 | |
| 1807 | } else { |
| 1808 | pool = __pool_table_lookup(pool_md); |
| 1809 | if (pool) { |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 1810 | if (pool->md_dev != metadata_dev) { |
| 1811 | *error = "different pool cannot replace a pool"; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1812 | return ERR_PTR(-EINVAL); |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 1813 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1814 | __pool_inc(pool); |
| 1815 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1816 | } else { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1817 | pool = pool_create(pool_md, metadata_dev, block_size, read_only, error); |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1818 | *created = 1; |
| 1819 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1820 | } |
| 1821 | |
| 1822 | return pool; |
| 1823 | } |
| 1824 | |
| 1825 | /*---------------------------------------------------------------- |
| 1826 | * Pool target methods |
| 1827 | *--------------------------------------------------------------*/ |
| 1828 | static void pool_dtr(struct dm_target *ti) |
| 1829 | { |
| 1830 | struct pool_c *pt = ti->private; |
| 1831 | |
| 1832 | mutex_lock(&dm_thin_pool_table.mutex); |
| 1833 | |
| 1834 | unbind_control_target(pt->pool, ti); |
| 1835 | __pool_dec(pt->pool); |
| 1836 | dm_put_device(ti, pt->metadata_dev); |
| 1837 | dm_put_device(ti, pt->data_dev); |
| 1838 | kfree(pt); |
| 1839 | |
| 1840 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 1841 | } |
| 1842 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1843 | static int parse_pool_features(struct dm_arg_set *as, struct pool_features *pf, |
| 1844 | struct dm_target *ti) |
| 1845 | { |
| 1846 | int r; |
| 1847 | unsigned argc; |
| 1848 | const char *arg_name; |
| 1849 | |
| 1850 | static struct dm_arg _args[] = { |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1851 | {0, 3, "Invalid number of pool feature arguments"}, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1852 | }; |
| 1853 | |
| 1854 | /* |
| 1855 | * No feature arguments supplied. |
| 1856 | */ |
| 1857 | if (!as->argc) |
| 1858 | return 0; |
| 1859 | |
| 1860 | r = dm_read_arg_group(_args, as, &argc, &ti->error); |
| 1861 | if (r) |
| 1862 | return -EINVAL; |
| 1863 | |
| 1864 | while (argc && !r) { |
| 1865 | arg_name = dm_shift_arg(as); |
| 1866 | argc--; |
| 1867 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1868 | if (!strcasecmp(arg_name, "skip_block_zeroing")) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1869 | pf->zero_new_blocks = false; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1870 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1871 | else if (!strcasecmp(arg_name, "ignore_discard")) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1872 | pf->discard_enabled = false; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1873 | |
| 1874 | else if (!strcasecmp(arg_name, "no_discard_passdown")) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1875 | pf->discard_passdown = false; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1876 | |
| 1877 | else if (!strcasecmp(arg_name, "read_only")) |
| 1878 | pf->mode = PM_READ_ONLY; |
| 1879 | |
| 1880 | else { |
| 1881 | ti->error = "Unrecognised pool feature requested"; |
| 1882 | r = -EINVAL; |
| 1883 | break; |
| 1884 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1885 | } |
| 1886 | |
| 1887 | return r; |
| 1888 | } |
| 1889 | |
| 1890 | /* |
| 1891 | * thin-pool <metadata dev> <data dev> |
| 1892 | * <data block size (sectors)> |
| 1893 | * <low water mark (blocks)> |
| 1894 | * [<#feature args> [<arg>]*] |
| 1895 | * |
| 1896 | * Optional feature arguments are: |
| 1897 | * skip_block_zeroing: skips the zeroing of newly-provisioned blocks. |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1898 | * ignore_discard: disable discard |
| 1899 | * no_discard_passdown: don't pass discards down to the data device |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1900 | */ |
| 1901 | static int pool_ctr(struct dm_target *ti, unsigned argc, char **argv) |
| 1902 | { |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1903 | int r, pool_created = 0; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1904 | struct pool_c *pt; |
| 1905 | struct pool *pool; |
| 1906 | struct pool_features pf; |
| 1907 | struct dm_arg_set as; |
| 1908 | struct dm_dev *data_dev; |
| 1909 | unsigned long block_size; |
| 1910 | dm_block_t low_water_blocks; |
| 1911 | struct dm_dev *metadata_dev; |
| 1912 | sector_t metadata_dev_size; |
Mike Snitzer | c4a69ec | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1913 | char b[BDEVNAME_SIZE]; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1914 | |
| 1915 | /* |
| 1916 | * FIXME Remove validation from scope of lock. |
| 1917 | */ |
| 1918 | mutex_lock(&dm_thin_pool_table.mutex); |
| 1919 | |
| 1920 | if (argc < 4) { |
| 1921 | ti->error = "Invalid argument count"; |
| 1922 | r = -EINVAL; |
| 1923 | goto out_unlock; |
| 1924 | } |
| 1925 | as.argc = argc; |
| 1926 | as.argv = argv; |
| 1927 | |
| 1928 | r = dm_get_device(ti, argv[0], FMODE_READ | FMODE_WRITE, &metadata_dev); |
| 1929 | if (r) { |
| 1930 | ti->error = "Error opening metadata block device"; |
| 1931 | goto out_unlock; |
| 1932 | } |
| 1933 | |
| 1934 | metadata_dev_size = i_size_read(metadata_dev->bdev->bd_inode) >> SECTOR_SHIFT; |
Mike Snitzer | c4a69ec | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1935 | if (metadata_dev_size > THIN_METADATA_MAX_SECTORS_WARNING) |
| 1936 | DMWARN("Metadata device %s is larger than %u sectors: excess space will not be used.", |
| 1937 | bdevname(metadata_dev->bdev, b), THIN_METADATA_MAX_SECTORS); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1938 | |
| 1939 | r = dm_get_device(ti, argv[1], FMODE_READ | FMODE_WRITE, &data_dev); |
| 1940 | if (r) { |
| 1941 | ti->error = "Error getting data device"; |
| 1942 | goto out_metadata; |
| 1943 | } |
| 1944 | |
| 1945 | if (kstrtoul(argv[2], 10, &block_size) || !block_size || |
| 1946 | block_size < DATA_DEV_BLOCK_SIZE_MIN_SECTORS || |
| 1947 | block_size > DATA_DEV_BLOCK_SIZE_MAX_SECTORS || |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 1948 | block_size & (DATA_DEV_BLOCK_SIZE_MIN_SECTORS - 1)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1949 | ti->error = "Invalid block size"; |
| 1950 | r = -EINVAL; |
| 1951 | goto out; |
| 1952 | } |
| 1953 | |
| 1954 | if (kstrtoull(argv[3], 10, (unsigned long long *)&low_water_blocks)) { |
| 1955 | ti->error = "Invalid low water mark"; |
| 1956 | r = -EINVAL; |
| 1957 | goto out; |
| 1958 | } |
| 1959 | |
| 1960 | /* |
| 1961 | * Set default pool features. |
| 1962 | */ |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1963 | pool_features_init(&pf); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1964 | |
| 1965 | dm_consume_args(&as, 4); |
| 1966 | r = parse_pool_features(&as, &pf, ti); |
| 1967 | if (r) |
| 1968 | goto out; |
| 1969 | |
| 1970 | pt = kzalloc(sizeof(*pt), GFP_KERNEL); |
| 1971 | if (!pt) { |
| 1972 | r = -ENOMEM; |
| 1973 | goto out; |
| 1974 | } |
| 1975 | |
| 1976 | pool = __pool_find(dm_table_get_md(ti->table), metadata_dev->bdev, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1977 | block_size, pf.mode == PM_READ_ONLY, &ti->error, &pool_created); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1978 | if (IS_ERR(pool)) { |
| 1979 | r = PTR_ERR(pool); |
| 1980 | goto out_free_pt; |
| 1981 | } |
| 1982 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1983 | /* |
| 1984 | * 'pool_created' reflects whether this is the first table load. |
| 1985 | * Top level discard support is not allowed to be changed after |
| 1986 | * initial load. This would require a pool reload to trigger thin |
| 1987 | * device changes. |
| 1988 | */ |
| 1989 | if (!pool_created && pf.discard_enabled != pool->pf.discard_enabled) { |
| 1990 | ti->error = "Discard support cannot be disabled once enabled"; |
| 1991 | r = -EINVAL; |
| 1992 | goto out_flags_changed; |
| 1993 | } |
| 1994 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1995 | pt->pool = pool; |
| 1996 | pt->ti = ti; |
| 1997 | pt->metadata_dev = metadata_dev; |
| 1998 | pt->data_dev = data_dev; |
| 1999 | pt->low_water_blocks = low_water_blocks; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2000 | pt->adjusted_pf = pt->requested_pf = pf; |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 2001 | ti->num_flush_bios = 1; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 2002 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2003 | /* |
| 2004 | * Only need to enable discards if the pool should pass |
| 2005 | * them down to the data device. The thin device's discard |
| 2006 | * processing will cause mappings to be removed from the btree. |
| 2007 | */ |
| 2008 | if (pf.discard_enabled && pf.discard_passdown) { |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 2009 | ti->num_discard_bios = 1; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 2010 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2011 | /* |
| 2012 | * Setting 'discards_supported' circumvents the normal |
| 2013 | * stacking of discard limits (this keeps the pool and |
| 2014 | * thin devices' discard limits consistent). |
| 2015 | */ |
Alasdair G Kergon | 0ac5548 | 2012-07-27 15:08:08 +0100 | [diff] [blame] | 2016 | ti->discards_supported = true; |
Mike Snitzer | 307615a | 2012-09-26 23:45:39 +0100 | [diff] [blame] | 2017 | ti->discard_zeroes_data_unsupported = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2018 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2019 | ti->private = pt; |
| 2020 | |
| 2021 | pt->callbacks.congested_fn = pool_is_congested; |
| 2022 | dm_table_add_target_callbacks(ti->table, &pt->callbacks); |
| 2023 | |
| 2024 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2025 | |
| 2026 | return 0; |
| 2027 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2028 | out_flags_changed: |
| 2029 | __pool_dec(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2030 | out_free_pt: |
| 2031 | kfree(pt); |
| 2032 | out: |
| 2033 | dm_put_device(ti, data_dev); |
| 2034 | out_metadata: |
| 2035 | dm_put_device(ti, metadata_dev); |
| 2036 | out_unlock: |
| 2037 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2038 | |
| 2039 | return r; |
| 2040 | } |
| 2041 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 2042 | static int pool_map(struct dm_target *ti, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2043 | { |
| 2044 | int r; |
| 2045 | struct pool_c *pt = ti->private; |
| 2046 | struct pool *pool = pt->pool; |
| 2047 | unsigned long flags; |
| 2048 | |
| 2049 | /* |
| 2050 | * As this is a singleton target, ti->begin is always zero. |
| 2051 | */ |
| 2052 | spin_lock_irqsave(&pool->lock, flags); |
| 2053 | bio->bi_bdev = pt->data_dev->bdev; |
| 2054 | r = DM_MAPIO_REMAPPED; |
| 2055 | spin_unlock_irqrestore(&pool->lock, flags); |
| 2056 | |
| 2057 | return r; |
| 2058 | } |
| 2059 | |
| 2060 | /* |
| 2061 | * Retrieves the number of blocks of the data device from |
| 2062 | * the superblock and compares it to the actual device size, |
| 2063 | * thus resizing the data device in case it has grown. |
| 2064 | * |
| 2065 | * This both copes with opening preallocated data devices in the ctr |
| 2066 | * being followed by a resume |
| 2067 | * -and- |
| 2068 | * calling the resume method individually after userspace has |
| 2069 | * grown the data device in reaction to a table event. |
| 2070 | */ |
| 2071 | static int pool_preresume(struct dm_target *ti) |
| 2072 | { |
| 2073 | int r; |
| 2074 | struct pool_c *pt = ti->private; |
| 2075 | struct pool *pool = pt->pool; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2076 | sector_t data_size = ti->len; |
| 2077 | dm_block_t sb_data_size; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2078 | |
| 2079 | /* |
| 2080 | * Take control of the pool object. |
| 2081 | */ |
| 2082 | r = bind_control_target(pool, ti); |
| 2083 | if (r) |
| 2084 | return r; |
| 2085 | |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2086 | (void) sector_div(data_size, pool->sectors_per_block); |
| 2087 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2088 | r = dm_pool_get_data_dev_size(pool->pmd, &sb_data_size); |
| 2089 | if (r) { |
| 2090 | DMERR("failed to retrieve data device size"); |
| 2091 | return r; |
| 2092 | } |
| 2093 | |
| 2094 | if (data_size < sb_data_size) { |
| 2095 | DMERR("pool target too small, is %llu blocks (expected %llu)", |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2096 | (unsigned long long)data_size, sb_data_size); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2097 | return -EINVAL; |
| 2098 | |
| 2099 | } else if (data_size > sb_data_size) { |
| 2100 | r = dm_pool_resize_data_dev(pool->pmd, data_size); |
| 2101 | if (r) { |
| 2102 | DMERR("failed to resize data device"); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2103 | /* FIXME Stricter than necessary: Rollback transaction instead here */ |
| 2104 | set_pool_mode(pool, PM_READ_ONLY); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2105 | return r; |
| 2106 | } |
| 2107 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2108 | (void) commit_or_fallback(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2109 | } |
| 2110 | |
| 2111 | return 0; |
| 2112 | } |
| 2113 | |
| 2114 | static void pool_resume(struct dm_target *ti) |
| 2115 | { |
| 2116 | struct pool_c *pt = ti->private; |
| 2117 | struct pool *pool = pt->pool; |
| 2118 | unsigned long flags; |
| 2119 | |
| 2120 | spin_lock_irqsave(&pool->lock, flags); |
| 2121 | pool->low_water_triggered = 0; |
| 2122 | pool->no_free_space = 0; |
| 2123 | __requeue_bios(pool); |
| 2124 | spin_unlock_irqrestore(&pool->lock, flags); |
| 2125 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 2126 | do_waker(&pool->waker.work); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2127 | } |
| 2128 | |
| 2129 | static void pool_postsuspend(struct dm_target *ti) |
| 2130 | { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2131 | struct pool_c *pt = ti->private; |
| 2132 | struct pool *pool = pt->pool; |
| 2133 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 2134 | cancel_delayed_work(&pool->waker); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2135 | flush_workqueue(pool->wq); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2136 | (void) commit_or_fallback(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2137 | } |
| 2138 | |
| 2139 | static int check_arg_count(unsigned argc, unsigned args_required) |
| 2140 | { |
| 2141 | if (argc != args_required) { |
| 2142 | DMWARN("Message received with %u arguments instead of %u.", |
| 2143 | argc, args_required); |
| 2144 | return -EINVAL; |
| 2145 | } |
| 2146 | |
| 2147 | return 0; |
| 2148 | } |
| 2149 | |
| 2150 | static int read_dev_id(char *arg, dm_thin_id *dev_id, int warning) |
| 2151 | { |
| 2152 | if (!kstrtoull(arg, 10, (unsigned long long *)dev_id) && |
| 2153 | *dev_id <= MAX_DEV_ID) |
| 2154 | return 0; |
| 2155 | |
| 2156 | if (warning) |
| 2157 | DMWARN("Message received with invalid device id: %s", arg); |
| 2158 | |
| 2159 | return -EINVAL; |
| 2160 | } |
| 2161 | |
| 2162 | static int process_create_thin_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2163 | { |
| 2164 | dm_thin_id dev_id; |
| 2165 | int r; |
| 2166 | |
| 2167 | r = check_arg_count(argc, 2); |
| 2168 | if (r) |
| 2169 | return r; |
| 2170 | |
| 2171 | r = read_dev_id(argv[1], &dev_id, 1); |
| 2172 | if (r) |
| 2173 | return r; |
| 2174 | |
| 2175 | r = dm_pool_create_thin(pool->pmd, dev_id); |
| 2176 | if (r) { |
| 2177 | DMWARN("Creation of new thinly-provisioned device with id %s failed.", |
| 2178 | argv[1]); |
| 2179 | return r; |
| 2180 | } |
| 2181 | |
| 2182 | return 0; |
| 2183 | } |
| 2184 | |
| 2185 | static int process_create_snap_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2186 | { |
| 2187 | dm_thin_id dev_id; |
| 2188 | dm_thin_id origin_dev_id; |
| 2189 | int r; |
| 2190 | |
| 2191 | r = check_arg_count(argc, 3); |
| 2192 | if (r) |
| 2193 | return r; |
| 2194 | |
| 2195 | r = read_dev_id(argv[1], &dev_id, 1); |
| 2196 | if (r) |
| 2197 | return r; |
| 2198 | |
| 2199 | r = read_dev_id(argv[2], &origin_dev_id, 1); |
| 2200 | if (r) |
| 2201 | return r; |
| 2202 | |
| 2203 | r = dm_pool_create_snap(pool->pmd, dev_id, origin_dev_id); |
| 2204 | if (r) { |
| 2205 | DMWARN("Creation of new snapshot %s of device %s failed.", |
| 2206 | argv[1], argv[2]); |
| 2207 | return r; |
| 2208 | } |
| 2209 | |
| 2210 | return 0; |
| 2211 | } |
| 2212 | |
| 2213 | static int process_delete_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2214 | { |
| 2215 | dm_thin_id dev_id; |
| 2216 | int r; |
| 2217 | |
| 2218 | r = check_arg_count(argc, 2); |
| 2219 | if (r) |
| 2220 | return r; |
| 2221 | |
| 2222 | r = read_dev_id(argv[1], &dev_id, 1); |
| 2223 | if (r) |
| 2224 | return r; |
| 2225 | |
| 2226 | r = dm_pool_delete_thin_device(pool->pmd, dev_id); |
| 2227 | if (r) |
| 2228 | DMWARN("Deletion of thin device %s failed.", argv[1]); |
| 2229 | |
| 2230 | return r; |
| 2231 | } |
| 2232 | |
| 2233 | static int process_set_transaction_id_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2234 | { |
| 2235 | dm_thin_id old_id, new_id; |
| 2236 | int r; |
| 2237 | |
| 2238 | r = check_arg_count(argc, 3); |
| 2239 | if (r) |
| 2240 | return r; |
| 2241 | |
| 2242 | if (kstrtoull(argv[1], 10, (unsigned long long *)&old_id)) { |
| 2243 | DMWARN("set_transaction_id message: Unrecognised id %s.", argv[1]); |
| 2244 | return -EINVAL; |
| 2245 | } |
| 2246 | |
| 2247 | if (kstrtoull(argv[2], 10, (unsigned long long *)&new_id)) { |
| 2248 | DMWARN("set_transaction_id message: Unrecognised new id %s.", argv[2]); |
| 2249 | return -EINVAL; |
| 2250 | } |
| 2251 | |
| 2252 | r = dm_pool_set_metadata_transaction_id(pool->pmd, old_id, new_id); |
| 2253 | if (r) { |
| 2254 | DMWARN("Failed to change transaction id from %s to %s.", |
| 2255 | argv[1], argv[2]); |
| 2256 | return r; |
| 2257 | } |
| 2258 | |
| 2259 | return 0; |
| 2260 | } |
| 2261 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2262 | static int process_reserve_metadata_snap_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2263 | { |
| 2264 | int r; |
| 2265 | |
| 2266 | r = check_arg_count(argc, 1); |
| 2267 | if (r) |
| 2268 | return r; |
| 2269 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2270 | (void) commit_or_fallback(pool); |
Joe Thornber | 0d200ae | 2012-07-03 12:55:31 +0100 | [diff] [blame] | 2271 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2272 | r = dm_pool_reserve_metadata_snap(pool->pmd); |
| 2273 | if (r) |
| 2274 | DMWARN("reserve_metadata_snap message failed."); |
| 2275 | |
| 2276 | return r; |
| 2277 | } |
| 2278 | |
| 2279 | static int process_release_metadata_snap_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2280 | { |
| 2281 | int r; |
| 2282 | |
| 2283 | r = check_arg_count(argc, 1); |
| 2284 | if (r) |
| 2285 | return r; |
| 2286 | |
| 2287 | r = dm_pool_release_metadata_snap(pool->pmd); |
| 2288 | if (r) |
| 2289 | DMWARN("release_metadata_snap message failed."); |
| 2290 | |
| 2291 | return r; |
| 2292 | } |
| 2293 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2294 | /* |
| 2295 | * Messages supported: |
| 2296 | * create_thin <dev_id> |
| 2297 | * create_snap <dev_id> <origin_id> |
| 2298 | * delete <dev_id> |
| 2299 | * trim <dev_id> <new_size_in_sectors> |
| 2300 | * set_transaction_id <current_trans_id> <new_trans_id> |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2301 | * reserve_metadata_snap |
| 2302 | * release_metadata_snap |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2303 | */ |
| 2304 | static int pool_message(struct dm_target *ti, unsigned argc, char **argv) |
| 2305 | { |
| 2306 | int r = -EINVAL; |
| 2307 | struct pool_c *pt = ti->private; |
| 2308 | struct pool *pool = pt->pool; |
| 2309 | |
| 2310 | if (!strcasecmp(argv[0], "create_thin")) |
| 2311 | r = process_create_thin_mesg(argc, argv, pool); |
| 2312 | |
| 2313 | else if (!strcasecmp(argv[0], "create_snap")) |
| 2314 | r = process_create_snap_mesg(argc, argv, pool); |
| 2315 | |
| 2316 | else if (!strcasecmp(argv[0], "delete")) |
| 2317 | r = process_delete_mesg(argc, argv, pool); |
| 2318 | |
| 2319 | else if (!strcasecmp(argv[0], "set_transaction_id")) |
| 2320 | r = process_set_transaction_id_mesg(argc, argv, pool); |
| 2321 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2322 | else if (!strcasecmp(argv[0], "reserve_metadata_snap")) |
| 2323 | r = process_reserve_metadata_snap_mesg(argc, argv, pool); |
| 2324 | |
| 2325 | else if (!strcasecmp(argv[0], "release_metadata_snap")) |
| 2326 | r = process_release_metadata_snap_mesg(argc, argv, pool); |
| 2327 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2328 | else |
| 2329 | DMWARN("Unrecognised thin pool target message received: %s", argv[0]); |
| 2330 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2331 | if (!r) |
| 2332 | (void) commit_or_fallback(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2333 | |
| 2334 | return r; |
| 2335 | } |
| 2336 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2337 | static void emit_flags(struct pool_features *pf, char *result, |
| 2338 | unsigned sz, unsigned maxlen) |
| 2339 | { |
| 2340 | unsigned count = !pf->zero_new_blocks + !pf->discard_enabled + |
| 2341 | !pf->discard_passdown + (pf->mode == PM_READ_ONLY); |
| 2342 | DMEMIT("%u ", count); |
| 2343 | |
| 2344 | if (!pf->zero_new_blocks) |
| 2345 | DMEMIT("skip_block_zeroing "); |
| 2346 | |
| 2347 | if (!pf->discard_enabled) |
| 2348 | DMEMIT("ignore_discard "); |
| 2349 | |
| 2350 | if (!pf->discard_passdown) |
| 2351 | DMEMIT("no_discard_passdown "); |
| 2352 | |
| 2353 | if (pf->mode == PM_READ_ONLY) |
| 2354 | DMEMIT("read_only "); |
| 2355 | } |
| 2356 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2357 | /* |
| 2358 | * Status line is: |
| 2359 | * <transaction id> <used metadata sectors>/<total metadata sectors> |
| 2360 | * <used data sectors>/<total data sectors> <held metadata root> |
| 2361 | */ |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2362 | static void pool_status(struct dm_target *ti, status_type_t type, |
| 2363 | unsigned status_flags, char *result, unsigned maxlen) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2364 | { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2365 | int r; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2366 | unsigned sz = 0; |
| 2367 | uint64_t transaction_id; |
| 2368 | dm_block_t nr_free_blocks_data; |
| 2369 | dm_block_t nr_free_blocks_metadata; |
| 2370 | dm_block_t nr_blocks_data; |
| 2371 | dm_block_t nr_blocks_metadata; |
| 2372 | dm_block_t held_root; |
| 2373 | char buf[BDEVNAME_SIZE]; |
| 2374 | char buf2[BDEVNAME_SIZE]; |
| 2375 | struct pool_c *pt = ti->private; |
| 2376 | struct pool *pool = pt->pool; |
| 2377 | |
| 2378 | switch (type) { |
| 2379 | case STATUSTYPE_INFO: |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2380 | if (get_pool_mode(pool) == PM_FAIL) { |
| 2381 | DMEMIT("Fail"); |
| 2382 | break; |
| 2383 | } |
| 2384 | |
Alasdair G Kergon | 1f4e0ff | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2385 | /* Commit to ensure statistics aren't out-of-date */ |
| 2386 | if (!(status_flags & DM_STATUS_NOFLUSH_FLAG) && !dm_suspended(ti)) |
| 2387 | (void) commit_or_fallback(pool); |
| 2388 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2389 | r = dm_pool_get_metadata_transaction_id(pool->pmd, &transaction_id); |
| 2390 | if (r) { |
| 2391 | DMERR("dm_pool_get_metadata_transaction_id returned %d", r); |
| 2392 | goto err; |
| 2393 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2394 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2395 | r = dm_pool_get_free_metadata_block_count(pool->pmd, &nr_free_blocks_metadata); |
| 2396 | if (r) { |
| 2397 | DMERR("dm_pool_get_free_metadata_block_count returned %d", r); |
| 2398 | goto err; |
| 2399 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2400 | |
| 2401 | r = dm_pool_get_metadata_dev_size(pool->pmd, &nr_blocks_metadata); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2402 | if (r) { |
| 2403 | DMERR("dm_pool_get_metadata_dev_size returned %d", r); |
| 2404 | goto err; |
| 2405 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2406 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2407 | r = dm_pool_get_free_block_count(pool->pmd, &nr_free_blocks_data); |
| 2408 | if (r) { |
| 2409 | DMERR("dm_pool_get_free_block_count returned %d", r); |
| 2410 | goto err; |
| 2411 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2412 | |
| 2413 | r = dm_pool_get_data_dev_size(pool->pmd, &nr_blocks_data); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2414 | if (r) { |
| 2415 | DMERR("dm_pool_get_data_dev_size returned %d", r); |
| 2416 | goto err; |
| 2417 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2418 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2419 | r = dm_pool_get_metadata_snap(pool->pmd, &held_root); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2420 | if (r) { |
| 2421 | DMERR("dm_pool_get_metadata_snap returned %d", r); |
| 2422 | goto err; |
| 2423 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2424 | |
| 2425 | DMEMIT("%llu %llu/%llu %llu/%llu ", |
| 2426 | (unsigned long long)transaction_id, |
| 2427 | (unsigned long long)(nr_blocks_metadata - nr_free_blocks_metadata), |
| 2428 | (unsigned long long)nr_blocks_metadata, |
| 2429 | (unsigned long long)(nr_blocks_data - nr_free_blocks_data), |
| 2430 | (unsigned long long)nr_blocks_data); |
| 2431 | |
| 2432 | if (held_root) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2433 | DMEMIT("%llu ", held_root); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2434 | else |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2435 | DMEMIT("- "); |
| 2436 | |
| 2437 | if (pool->pf.mode == PM_READ_ONLY) |
| 2438 | DMEMIT("ro "); |
| 2439 | else |
| 2440 | DMEMIT("rw "); |
| 2441 | |
Mike Snitzer | 018debe | 2012-12-21 20:23:32 +0000 | [diff] [blame] | 2442 | if (!pool->pf.discard_enabled) |
| 2443 | DMEMIT("ignore_discard"); |
| 2444 | else if (pool->pf.discard_passdown) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2445 | DMEMIT("discard_passdown"); |
| 2446 | else |
| 2447 | DMEMIT("no_discard_passdown"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2448 | |
| 2449 | break; |
| 2450 | |
| 2451 | case STATUSTYPE_TABLE: |
| 2452 | DMEMIT("%s %s %lu %llu ", |
| 2453 | format_dev_t(buf, pt->metadata_dev->bdev->bd_dev), |
| 2454 | format_dev_t(buf2, pt->data_dev->bdev->bd_dev), |
| 2455 | (unsigned long)pool->sectors_per_block, |
| 2456 | (unsigned long long)pt->low_water_blocks); |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2457 | emit_flags(&pt->requested_pf, result, sz, maxlen); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2458 | break; |
| 2459 | } |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2460 | return; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2461 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2462 | err: |
| 2463 | DMEMIT("Error"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2464 | } |
| 2465 | |
| 2466 | static int pool_iterate_devices(struct dm_target *ti, |
| 2467 | iterate_devices_callout_fn fn, void *data) |
| 2468 | { |
| 2469 | struct pool_c *pt = ti->private; |
| 2470 | |
| 2471 | return fn(ti, pt->data_dev, 0, ti->len, data); |
| 2472 | } |
| 2473 | |
| 2474 | static int pool_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
| 2475 | struct bio_vec *biovec, int max_size) |
| 2476 | { |
| 2477 | struct pool_c *pt = ti->private; |
| 2478 | struct request_queue *q = bdev_get_queue(pt->data_dev->bdev); |
| 2479 | |
| 2480 | if (!q->merge_bvec_fn) |
| 2481 | return max_size; |
| 2482 | |
| 2483 | bvm->bi_bdev = pt->data_dev->bdev; |
| 2484 | |
| 2485 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); |
| 2486 | } |
| 2487 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2488 | static void set_discard_limits(struct pool_c *pt, struct queue_limits *limits) |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2489 | { |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2490 | struct pool *pool = pt->pool; |
| 2491 | struct queue_limits *data_limits; |
| 2492 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2493 | limits->max_discard_sectors = pool->sectors_per_block; |
| 2494 | |
| 2495 | /* |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2496 | * discard_granularity is just a hint, and not enforced. |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2497 | */ |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2498 | if (pt->adjusted_pf.discard_passdown) { |
| 2499 | data_limits = &bdev_get_queue(pt->data_dev->bdev)->limits; |
| 2500 | limits->discard_granularity = data_limits->discard_granularity; |
Mike Snitzer | f13945d | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2501 | } else |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2502 | limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2503 | } |
| 2504 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2505 | static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits) |
| 2506 | { |
| 2507 | struct pool_c *pt = ti->private; |
| 2508 | struct pool *pool = pt->pool; |
| 2509 | |
| 2510 | blk_limits_io_min(limits, 0); |
| 2511 | blk_limits_io_opt(limits, pool->sectors_per_block << SECTOR_SHIFT); |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2512 | |
| 2513 | /* |
| 2514 | * pt->adjusted_pf is a staging area for the actual features to use. |
| 2515 | * They get transferred to the live pool in bind_control_target() |
| 2516 | * called from pool_preresume(). |
| 2517 | */ |
| 2518 | if (!pt->adjusted_pf.discard_enabled) |
| 2519 | return; |
| 2520 | |
| 2521 | disable_passdown_if_not_supported(pt); |
| 2522 | |
| 2523 | set_discard_limits(pt, limits); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2524 | } |
| 2525 | |
| 2526 | static struct target_type pool_target = { |
| 2527 | .name = "thin-pool", |
| 2528 | .features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE | |
| 2529 | DM_TARGET_IMMUTABLE, |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2530 | .version = {1, 6, 1}, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2531 | .module = THIS_MODULE, |
| 2532 | .ctr = pool_ctr, |
| 2533 | .dtr = pool_dtr, |
| 2534 | .map = pool_map, |
| 2535 | .postsuspend = pool_postsuspend, |
| 2536 | .preresume = pool_preresume, |
| 2537 | .resume = pool_resume, |
| 2538 | .message = pool_message, |
| 2539 | .status = pool_status, |
| 2540 | .merge = pool_merge, |
| 2541 | .iterate_devices = pool_iterate_devices, |
| 2542 | .io_hints = pool_io_hints, |
| 2543 | }; |
| 2544 | |
| 2545 | /*---------------------------------------------------------------- |
| 2546 | * Thin target methods |
| 2547 | *--------------------------------------------------------------*/ |
| 2548 | static void thin_dtr(struct dm_target *ti) |
| 2549 | { |
| 2550 | struct thin_c *tc = ti->private; |
| 2551 | |
| 2552 | mutex_lock(&dm_thin_pool_table.mutex); |
| 2553 | |
| 2554 | __pool_dec(tc->pool); |
| 2555 | dm_pool_close_thin_device(tc->td); |
| 2556 | dm_put_device(ti, tc->pool_dev); |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2557 | if (tc->origin_dev) |
| 2558 | dm_put_device(ti, tc->origin_dev); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2559 | kfree(tc); |
| 2560 | |
| 2561 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2562 | } |
| 2563 | |
| 2564 | /* |
| 2565 | * Thin target parameters: |
| 2566 | * |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2567 | * <pool_dev> <dev_id> [origin_dev] |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2568 | * |
| 2569 | * pool_dev: the path to the pool (eg, /dev/mapper/my_pool) |
| 2570 | * dev_id: the internal device identifier |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2571 | * origin_dev: a device external to the pool that should act as the origin |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2572 | * |
| 2573 | * If the pool device has discards disabled, they get disabled for the thin |
| 2574 | * device as well. |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2575 | */ |
| 2576 | static int thin_ctr(struct dm_target *ti, unsigned argc, char **argv) |
| 2577 | { |
| 2578 | int r; |
| 2579 | struct thin_c *tc; |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2580 | struct dm_dev *pool_dev, *origin_dev; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2581 | struct mapped_device *pool_md; |
| 2582 | |
| 2583 | mutex_lock(&dm_thin_pool_table.mutex); |
| 2584 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2585 | if (argc != 2 && argc != 3) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2586 | ti->error = "Invalid argument count"; |
| 2587 | r = -EINVAL; |
| 2588 | goto out_unlock; |
| 2589 | } |
| 2590 | |
| 2591 | tc = ti->private = kzalloc(sizeof(*tc), GFP_KERNEL); |
| 2592 | if (!tc) { |
| 2593 | ti->error = "Out of memory"; |
| 2594 | r = -ENOMEM; |
| 2595 | goto out_unlock; |
| 2596 | } |
| 2597 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2598 | if (argc == 3) { |
| 2599 | r = dm_get_device(ti, argv[2], FMODE_READ, &origin_dev); |
| 2600 | if (r) { |
| 2601 | ti->error = "Error opening origin device"; |
| 2602 | goto bad_origin_dev; |
| 2603 | } |
| 2604 | tc->origin_dev = origin_dev; |
| 2605 | } |
| 2606 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2607 | r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &pool_dev); |
| 2608 | if (r) { |
| 2609 | ti->error = "Error opening pool device"; |
| 2610 | goto bad_pool_dev; |
| 2611 | } |
| 2612 | tc->pool_dev = pool_dev; |
| 2613 | |
| 2614 | if (read_dev_id(argv[1], (unsigned long long *)&tc->dev_id, 0)) { |
| 2615 | ti->error = "Invalid device id"; |
| 2616 | r = -EINVAL; |
| 2617 | goto bad_common; |
| 2618 | } |
| 2619 | |
| 2620 | pool_md = dm_get_md(tc->pool_dev->bdev->bd_dev); |
| 2621 | if (!pool_md) { |
| 2622 | ti->error = "Couldn't get pool mapped device"; |
| 2623 | r = -EINVAL; |
| 2624 | goto bad_common; |
| 2625 | } |
| 2626 | |
| 2627 | tc->pool = __pool_table_lookup(pool_md); |
| 2628 | if (!tc->pool) { |
| 2629 | ti->error = "Couldn't find pool object"; |
| 2630 | r = -EINVAL; |
| 2631 | goto bad_pool_lookup; |
| 2632 | } |
| 2633 | __pool_inc(tc->pool); |
| 2634 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2635 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
| 2636 | ti->error = "Couldn't open thin device, Pool is in fail mode"; |
| 2637 | goto bad_thin_open; |
| 2638 | } |
| 2639 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2640 | r = dm_pool_open_thin_device(tc->pool->pmd, tc->dev_id, &tc->td); |
| 2641 | if (r) { |
| 2642 | ti->error = "Couldn't open thin internal device"; |
| 2643 | goto bad_thin_open; |
| 2644 | } |
| 2645 | |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 2646 | r = dm_set_target_max_io_len(ti, tc->pool->sectors_per_block); |
| 2647 | if (r) |
| 2648 | goto bad_thin_open; |
| 2649 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 2650 | ti->num_flush_bios = 1; |
Joe Thornber | 16ad3d1 | 2012-07-27 15:08:07 +0100 | [diff] [blame] | 2651 | ti->flush_supported = true; |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 2652 | ti->per_bio_data_size = sizeof(struct dm_thin_endio_hook); |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2653 | |
| 2654 | /* In case the pool supports discards, pass them on. */ |
| 2655 | if (tc->pool->pf.discard_enabled) { |
Alasdair G Kergon | 0ac5548 | 2012-07-27 15:08:08 +0100 | [diff] [blame] | 2656 | ti->discards_supported = true; |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 2657 | ti->num_discard_bios = 1; |
Alasdair G Kergon | 0ac5548 | 2012-07-27 15:08:08 +0100 | [diff] [blame] | 2658 | ti->discard_zeroes_data_unsupported = true; |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 2659 | /* Discard bios must be split on a block boundary */ |
| 2660 | ti->split_discard_bios = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2661 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2662 | |
| 2663 | dm_put(pool_md); |
| 2664 | |
| 2665 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2666 | |
| 2667 | return 0; |
| 2668 | |
| 2669 | bad_thin_open: |
| 2670 | __pool_dec(tc->pool); |
| 2671 | bad_pool_lookup: |
| 2672 | dm_put(pool_md); |
| 2673 | bad_common: |
| 2674 | dm_put_device(ti, tc->pool_dev); |
| 2675 | bad_pool_dev: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2676 | if (tc->origin_dev) |
| 2677 | dm_put_device(ti, tc->origin_dev); |
| 2678 | bad_origin_dev: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2679 | kfree(tc); |
| 2680 | out_unlock: |
| 2681 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2682 | |
| 2683 | return r; |
| 2684 | } |
| 2685 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 2686 | static int thin_map(struct dm_target *ti, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2687 | { |
Alasdair G Kergon | 6efd6e8 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2688 | bio->bi_sector = dm_target_offset(ti, bio->bi_sector); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2689 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 2690 | return thin_bio_map(ti, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2691 | } |
| 2692 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 2693 | static int thin_endio(struct dm_target *ti, struct bio *bio, int err) |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2694 | { |
| 2695 | unsigned long flags; |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 2696 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2697 | struct list_head work; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2698 | struct dm_thin_new_mapping *m, *tmp; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2699 | struct pool *pool = h->tc->pool; |
| 2700 | |
| 2701 | if (h->shared_read_entry) { |
| 2702 | INIT_LIST_HEAD(&work); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 2703 | dm_deferred_entry_dec(h->shared_read_entry, &work); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2704 | |
| 2705 | spin_lock_irqsave(&pool->lock, flags); |
| 2706 | list_for_each_entry_safe(m, tmp, &work, list) { |
| 2707 | list_del(&m->list); |
| 2708 | m->quiesced = 1; |
| 2709 | __maybe_add_mapping(m); |
| 2710 | } |
| 2711 | spin_unlock_irqrestore(&pool->lock, flags); |
| 2712 | } |
| 2713 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2714 | if (h->all_io_entry) { |
| 2715 | INIT_LIST_HEAD(&work); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 2716 | dm_deferred_entry_dec(h->all_io_entry, &work); |
Joe Thornber | 563af18 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 2717 | if (!list_empty(&work)) { |
| 2718 | spin_lock_irqsave(&pool->lock, flags); |
| 2719 | list_for_each_entry_safe(m, tmp, &work, list) |
| 2720 | list_add(&m->list, &pool->prepared_discards); |
| 2721 | spin_unlock_irqrestore(&pool->lock, flags); |
| 2722 | wake_worker(pool); |
| 2723 | } |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2724 | } |
| 2725 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2726 | return 0; |
| 2727 | } |
| 2728 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2729 | static void thin_postsuspend(struct dm_target *ti) |
| 2730 | { |
| 2731 | if (dm_noflush_suspending(ti)) |
| 2732 | requeue_io((struct thin_c *)ti->private); |
| 2733 | } |
| 2734 | |
| 2735 | /* |
| 2736 | * <nr mapped sectors> <highest mapped sector> |
| 2737 | */ |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2738 | static void thin_status(struct dm_target *ti, status_type_t type, |
| 2739 | unsigned status_flags, char *result, unsigned maxlen) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2740 | { |
| 2741 | int r; |
| 2742 | ssize_t sz = 0; |
| 2743 | dm_block_t mapped, highest; |
| 2744 | char buf[BDEVNAME_SIZE]; |
| 2745 | struct thin_c *tc = ti->private; |
| 2746 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2747 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
| 2748 | DMEMIT("Fail"); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2749 | return; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2750 | } |
| 2751 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2752 | if (!tc->td) |
| 2753 | DMEMIT("-"); |
| 2754 | else { |
| 2755 | switch (type) { |
| 2756 | case STATUSTYPE_INFO: |
| 2757 | r = dm_thin_get_mapped_count(tc->td, &mapped); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2758 | if (r) { |
| 2759 | DMERR("dm_thin_get_mapped_count returned %d", r); |
| 2760 | goto err; |
| 2761 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2762 | |
| 2763 | r = dm_thin_get_highest_mapped_block(tc->td, &highest); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2764 | if (r < 0) { |
| 2765 | DMERR("dm_thin_get_highest_mapped_block returned %d", r); |
| 2766 | goto err; |
| 2767 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2768 | |
| 2769 | DMEMIT("%llu ", mapped * tc->pool->sectors_per_block); |
| 2770 | if (r) |
| 2771 | DMEMIT("%llu", ((highest + 1) * |
| 2772 | tc->pool->sectors_per_block) - 1); |
| 2773 | else |
| 2774 | DMEMIT("-"); |
| 2775 | break; |
| 2776 | |
| 2777 | case STATUSTYPE_TABLE: |
| 2778 | DMEMIT("%s %lu", |
| 2779 | format_dev_t(buf, tc->pool_dev->bdev->bd_dev), |
| 2780 | (unsigned long) tc->dev_id); |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2781 | if (tc->origin_dev) |
| 2782 | DMEMIT(" %s", format_dev_t(buf, tc->origin_dev->bdev->bd_dev)); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2783 | break; |
| 2784 | } |
| 2785 | } |
| 2786 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2787 | return; |
| 2788 | |
| 2789 | err: |
| 2790 | DMEMIT("Error"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2791 | } |
| 2792 | |
| 2793 | static int thin_iterate_devices(struct dm_target *ti, |
| 2794 | iterate_devices_callout_fn fn, void *data) |
| 2795 | { |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2796 | sector_t blocks; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2797 | struct thin_c *tc = ti->private; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2798 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2799 | |
| 2800 | /* |
| 2801 | * We can't call dm_pool_get_data_dev_size() since that blocks. So |
| 2802 | * we follow a more convoluted path through to the pool's target. |
| 2803 | */ |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2804 | if (!pool->ti) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2805 | return 0; /* nothing is bound */ |
| 2806 | |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2807 | blocks = pool->ti->len; |
| 2808 | (void) sector_div(blocks, pool->sectors_per_block); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2809 | if (blocks) |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2810 | return fn(ti, tc->pool_dev, 0, pool->sectors_per_block * blocks, data); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2811 | |
| 2812 | return 0; |
| 2813 | } |
| 2814 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2815 | static struct target_type thin_target = { |
| 2816 | .name = "thin", |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2817 | .version = {1, 7, 1}, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2818 | .module = THIS_MODULE, |
| 2819 | .ctr = thin_ctr, |
| 2820 | .dtr = thin_dtr, |
| 2821 | .map = thin_map, |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2822 | .end_io = thin_endio, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2823 | .postsuspend = thin_postsuspend, |
| 2824 | .status = thin_status, |
| 2825 | .iterate_devices = thin_iterate_devices, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2826 | }; |
| 2827 | |
| 2828 | /*----------------------------------------------------------------*/ |
| 2829 | |
| 2830 | static int __init dm_thin_init(void) |
| 2831 | { |
| 2832 | int r; |
| 2833 | |
| 2834 | pool_table_init(); |
| 2835 | |
| 2836 | r = dm_register_target(&thin_target); |
| 2837 | if (r) |
| 2838 | return r; |
| 2839 | |
| 2840 | r = dm_register_target(&pool_target); |
| 2841 | if (r) |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2842 | goto bad_pool_target; |
| 2843 | |
| 2844 | r = -ENOMEM; |
| 2845 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2846 | _new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, 0); |
| 2847 | if (!_new_mapping_cache) |
| 2848 | goto bad_new_mapping_cache; |
| 2849 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2850 | return 0; |
| 2851 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2852 | bad_new_mapping_cache: |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2853 | dm_unregister_target(&pool_target); |
| 2854 | bad_pool_target: |
| 2855 | dm_unregister_target(&thin_target); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2856 | |
| 2857 | return r; |
| 2858 | } |
| 2859 | |
| 2860 | static void dm_thin_exit(void) |
| 2861 | { |
| 2862 | dm_unregister_target(&thin_target); |
| 2863 | dm_unregister_target(&pool_target); |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2864 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2865 | kmem_cache_destroy(_new_mapping_cache); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2866 | } |
| 2867 | |
| 2868 | module_init(dm_thin_init); |
| 2869 | module_exit(dm_thin_exit); |
| 2870 | |
Alasdair G Kergon | 7cab8bf | 2012-05-12 01:43:19 +0100 | [diff] [blame] | 2871 | MODULE_DESCRIPTION(DM_NAME " thin provisioning target"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2872 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); |
| 2873 | MODULE_LICENSE("GPL"); |