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 | |
| 29 | /* |
| 30 | * The block size of the device holding pool data must be |
| 31 | * between 64KB and 1GB. |
| 32 | */ |
| 33 | #define DATA_DEV_BLOCK_SIZE_MIN_SECTORS (64 * 1024 >> SECTOR_SHIFT) |
| 34 | #define DATA_DEV_BLOCK_SIZE_MAX_SECTORS (1024 * 1024 * 1024 >> SECTOR_SHIFT) |
| 35 | |
| 36 | /* |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 37 | * Device id is restricted to 24 bits. |
| 38 | */ |
| 39 | #define MAX_DEV_ID ((1 << 24) - 1) |
| 40 | |
| 41 | /* |
| 42 | * How do we handle breaking sharing of data blocks? |
| 43 | * ================================================= |
| 44 | * |
| 45 | * We use a standard copy-on-write btree to store the mappings for the |
| 46 | * devices (note I'm talking about copy-on-write of the metadata here, not |
| 47 | * the data). When you take an internal snapshot you clone the root node |
| 48 | * of the origin btree. After this there is no concept of an origin or a |
| 49 | * snapshot. They are just two device trees that happen to point to the |
| 50 | * same data blocks. |
| 51 | * |
| 52 | * When we get a write in we decide if it's to a shared data block using |
| 53 | * some timestamp magic. If it is, we have to break sharing. |
| 54 | * |
| 55 | * Let's say we write to a shared block in what was the origin. The |
| 56 | * steps are: |
| 57 | * |
| 58 | * i) plug io further to this physical block. (see bio_prison code). |
| 59 | * |
| 60 | * ii) quiesce any read io to that shared data block. Obviously |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 61 | * including all devices that share this block. (see dm_deferred_set code) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 62 | * |
| 63 | * iii) copy the data block to a newly allocate block. This step can be |
| 64 | * missed out if the io covers the block. (schedule_copy). |
| 65 | * |
| 66 | * iv) insert the new mapping into the origin's btree |
Joe Thornber | fe878f3 | 2012-03-28 18:41:24 +0100 | [diff] [blame] | 67 | * (process_prepared_mapping). This act of inserting breaks some |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 68 | * sharing of btree nodes between the two devices. Breaking sharing only |
| 69 | * effects the btree of that specific device. Btrees for the other |
| 70 | * devices that share the block never change. The btree for the origin |
| 71 | * device as it was after the last commit is untouched, ie. we're using |
| 72 | * persistent data structures in the functional programming sense. |
| 73 | * |
| 74 | * v) unplug io to this physical block, including the io that triggered |
| 75 | * the breaking of sharing. |
| 76 | * |
| 77 | * Steps (ii) and (iii) occur in parallel. |
| 78 | * |
| 79 | * The metadata _doesn't_ need to be committed before the io continues. We |
| 80 | * get away with this because the io is always written to a _new_ block. |
| 81 | * If there's a crash, then: |
| 82 | * |
| 83 | * - The origin mapping will point to the old origin block (the shared |
| 84 | * one). This will contain the data as it was before the io that triggered |
| 85 | * the breaking of sharing came in. |
| 86 | * |
| 87 | * - The snap mapping still points to the old block. As it would after |
| 88 | * the commit. |
| 89 | * |
| 90 | * The downside of this scheme is the timestamp magic isn't perfect, and |
| 91 | * will continue to think that data block in the snapshot device is shared |
| 92 | * even after the write to the origin has broken sharing. I suspect data |
| 93 | * blocks will typically be shared by many different devices, so we're |
| 94 | * breaking sharing n + 1 times, rather than n, where n is the number of |
| 95 | * devices that reference this data block. At the moment I think the |
| 96 | * benefits far, far outweigh the disadvantages. |
| 97 | */ |
| 98 | |
| 99 | /*----------------------------------------------------------------*/ |
| 100 | |
| 101 | /* |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 102 | * Key building. |
| 103 | */ |
| 104 | static void build_data_key(struct dm_thin_device *td, |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 105 | dm_block_t b, struct dm_cell_key *key) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 106 | { |
| 107 | key->virtual = 0; |
| 108 | key->dev = dm_thin_dev_id(td); |
| 109 | key->block = b; |
| 110 | } |
| 111 | |
| 112 | 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] | 113 | struct dm_cell_key *key) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 114 | { |
| 115 | key->virtual = 1; |
| 116 | key->dev = dm_thin_dev_id(td); |
| 117 | key->block = b; |
| 118 | } |
| 119 | |
| 120 | /*----------------------------------------------------------------*/ |
| 121 | |
| 122 | /* |
| 123 | * A pool device ties together a metadata device and a data device. It |
| 124 | * also provides the interface for creating and destroying internal |
| 125 | * devices. |
| 126 | */ |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 127 | struct dm_thin_new_mapping; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 128 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 129 | /* |
| 130 | * The pool runs in 3 modes. Ordered in degraded order for comparisons. |
| 131 | */ |
| 132 | enum pool_mode { |
| 133 | PM_WRITE, /* metadata may be changed */ |
| 134 | PM_READ_ONLY, /* metadata may not be changed */ |
| 135 | PM_FAIL, /* all I/O fails */ |
| 136 | }; |
| 137 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 138 | struct pool_features { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 139 | enum pool_mode mode; |
| 140 | |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 141 | bool zero_new_blocks:1; |
| 142 | bool discard_enabled:1; |
| 143 | bool discard_passdown:1; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 144 | }; |
| 145 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 146 | struct thin_c; |
| 147 | typedef void (*process_bio_fn)(struct thin_c *tc, struct bio *bio); |
| 148 | typedef void (*process_mapping_fn)(struct dm_thin_new_mapping *m); |
| 149 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 150 | struct pool { |
| 151 | struct list_head list; |
| 152 | struct dm_target *ti; /* Only set if a pool target is bound */ |
| 153 | |
| 154 | struct mapped_device *pool_md; |
| 155 | struct block_device *md_dev; |
| 156 | struct dm_pool_metadata *pmd; |
| 157 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 158 | dm_block_t low_water_blocks; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 159 | uint32_t sectors_per_block; |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 160 | int sectors_per_block_shift; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 161 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 162 | struct pool_features pf; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 163 | unsigned low_water_triggered:1; /* A dm event has been sent */ |
| 164 | unsigned no_free_space:1; /* A -ENOSPC warning has been issued */ |
| 165 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 166 | struct dm_bio_prison *prison; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 167 | struct dm_kcopyd_client *copier; |
| 168 | |
| 169 | struct workqueue_struct *wq; |
| 170 | struct work_struct worker; |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 171 | struct delayed_work waker; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 172 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 173 | unsigned long last_commit_jiffies; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 174 | unsigned ref_count; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 175 | |
| 176 | spinlock_t lock; |
| 177 | struct bio_list deferred_bios; |
| 178 | struct bio_list deferred_flush_bios; |
| 179 | struct list_head prepared_mappings; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 180 | struct list_head prepared_discards; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 181 | |
| 182 | struct bio_list retry_on_resume_list; |
| 183 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 184 | struct dm_deferred_set *shared_read_ds; |
| 185 | struct dm_deferred_set *all_io_ds; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 186 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 187 | struct dm_thin_new_mapping *next_mapping; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 188 | mempool_t *mapping_pool; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 189 | |
| 190 | process_bio_fn process_bio; |
| 191 | process_bio_fn process_discard; |
| 192 | |
| 193 | process_mapping_fn process_prepared_mapping; |
| 194 | process_mapping_fn process_prepared_discard; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 195 | }; |
| 196 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 197 | static enum pool_mode get_pool_mode(struct pool *pool); |
| 198 | static void set_pool_mode(struct pool *pool, enum pool_mode mode); |
| 199 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 200 | /* |
| 201 | * Target context for a pool. |
| 202 | */ |
| 203 | struct pool_c { |
| 204 | struct dm_target *ti; |
| 205 | struct pool *pool; |
| 206 | struct dm_dev *data_dev; |
| 207 | struct dm_dev *metadata_dev; |
| 208 | struct dm_target_callbacks callbacks; |
| 209 | |
| 210 | dm_block_t low_water_blocks; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 211 | struct pool_features requested_pf; /* Features requested during table load */ |
| 212 | struct pool_features adjusted_pf; /* Features used after adjusting for constituent devices */ |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 213 | }; |
| 214 | |
| 215 | /* |
| 216 | * Target context for a thin. |
| 217 | */ |
| 218 | struct thin_c { |
| 219 | struct dm_dev *pool_dev; |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 220 | struct dm_dev *origin_dev; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 221 | dm_thin_id dev_id; |
| 222 | |
| 223 | struct pool *pool; |
| 224 | struct dm_thin_device *td; |
| 225 | }; |
| 226 | |
| 227 | /*----------------------------------------------------------------*/ |
| 228 | |
| 229 | /* |
| 230 | * A global list of pools that uses a struct mapped_device as a key. |
| 231 | */ |
| 232 | static struct dm_thin_pool_table { |
| 233 | struct mutex mutex; |
| 234 | struct list_head pools; |
| 235 | } dm_thin_pool_table; |
| 236 | |
| 237 | static void pool_table_init(void) |
| 238 | { |
| 239 | mutex_init(&dm_thin_pool_table.mutex); |
| 240 | INIT_LIST_HEAD(&dm_thin_pool_table.pools); |
| 241 | } |
| 242 | |
| 243 | static void __pool_table_insert(struct pool *pool) |
| 244 | { |
| 245 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 246 | list_add(&pool->list, &dm_thin_pool_table.pools); |
| 247 | } |
| 248 | |
| 249 | static void __pool_table_remove(struct pool *pool) |
| 250 | { |
| 251 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 252 | list_del(&pool->list); |
| 253 | } |
| 254 | |
| 255 | static struct pool *__pool_table_lookup(struct mapped_device *md) |
| 256 | { |
| 257 | struct pool *pool = NULL, *tmp; |
| 258 | |
| 259 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 260 | |
| 261 | list_for_each_entry(tmp, &dm_thin_pool_table.pools, list) { |
| 262 | if (tmp->pool_md == md) { |
| 263 | pool = tmp; |
| 264 | break; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | return pool; |
| 269 | } |
| 270 | |
| 271 | static struct pool *__pool_table_lookup_metadata_dev(struct block_device *md_dev) |
| 272 | { |
| 273 | struct pool *pool = NULL, *tmp; |
| 274 | |
| 275 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 276 | |
| 277 | list_for_each_entry(tmp, &dm_thin_pool_table.pools, list) { |
| 278 | if (tmp->md_dev == md_dev) { |
| 279 | pool = tmp; |
| 280 | break; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | return pool; |
| 285 | } |
| 286 | |
| 287 | /*----------------------------------------------------------------*/ |
| 288 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 289 | struct dm_thin_endio_hook { |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 290 | struct thin_c *tc; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 291 | struct dm_deferred_entry *shared_read_entry; |
| 292 | struct dm_deferred_entry *all_io_entry; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 293 | struct dm_thin_new_mapping *overwrite_mapping; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 294 | }; |
| 295 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 296 | static void __requeue_bio_list(struct thin_c *tc, struct bio_list *master) |
| 297 | { |
| 298 | struct bio *bio; |
| 299 | struct bio_list bios; |
| 300 | |
| 301 | bio_list_init(&bios); |
| 302 | bio_list_merge(&bios, master); |
| 303 | bio_list_init(master); |
| 304 | |
| 305 | while ((bio = bio_list_pop(&bios))) { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 306 | 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] | 307 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 308 | if (h->tc == tc) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 309 | bio_endio(bio, DM_ENDIO_REQUEUE); |
| 310 | else |
| 311 | bio_list_add(master, bio); |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | static void requeue_io(struct thin_c *tc) |
| 316 | { |
| 317 | struct pool *pool = tc->pool; |
| 318 | unsigned long flags; |
| 319 | |
| 320 | spin_lock_irqsave(&pool->lock, flags); |
| 321 | __requeue_bio_list(tc, &pool->deferred_bios); |
| 322 | __requeue_bio_list(tc, &pool->retry_on_resume_list); |
| 323 | spin_unlock_irqrestore(&pool->lock, flags); |
| 324 | } |
| 325 | |
| 326 | /* |
| 327 | * This section of code contains the logic for processing a thin device's IO. |
| 328 | * Much of the code depends on pool object resources (lists, workqueues, etc) |
| 329 | * but most is exclusively called from the thin target rather than the thin-pool |
| 330 | * target. |
| 331 | */ |
| 332 | |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 333 | static bool block_size_is_power_of_two(struct pool *pool) |
| 334 | { |
| 335 | return pool->sectors_per_block_shift >= 0; |
| 336 | } |
| 337 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 338 | static dm_block_t get_bio_block(struct thin_c *tc, struct bio *bio) |
| 339 | { |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 340 | struct pool *pool = tc->pool; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 341 | sector_t block_nr = bio->bi_sector; |
| 342 | |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 343 | if (block_size_is_power_of_two(pool)) |
| 344 | block_nr >>= pool->sectors_per_block_shift; |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 345 | else |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 346 | (void) sector_div(block_nr, pool->sectors_per_block); |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 347 | |
| 348 | return block_nr; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | static void remap(struct thin_c *tc, struct bio *bio, dm_block_t block) |
| 352 | { |
| 353 | struct pool *pool = tc->pool; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 354 | sector_t bi_sector = bio->bi_sector; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 355 | |
| 356 | bio->bi_bdev = tc->pool_dev->bdev; |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 357 | if (block_size_is_power_of_two(pool)) |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 358 | bio->bi_sector = (block << pool->sectors_per_block_shift) | |
| 359 | (bi_sector & (pool->sectors_per_block - 1)); |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 360 | else |
| 361 | bio->bi_sector = (block * pool->sectors_per_block) + |
| 362 | sector_div(bi_sector, pool->sectors_per_block); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 363 | } |
| 364 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 365 | static void remap_to_origin(struct thin_c *tc, struct bio *bio) |
| 366 | { |
| 367 | bio->bi_bdev = tc->origin_dev->bdev; |
| 368 | } |
| 369 | |
Joe Thornber | 4afdd68 | 2012-07-27 15:08:14 +0100 | [diff] [blame] | 370 | static int bio_triggers_commit(struct thin_c *tc, struct bio *bio) |
| 371 | { |
| 372 | return (bio->bi_rw & (REQ_FLUSH | REQ_FUA)) && |
| 373 | dm_thin_changed_this_transaction(tc->td); |
| 374 | } |
| 375 | |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 376 | static void inc_all_io_entry(struct pool *pool, struct bio *bio) |
| 377 | { |
| 378 | struct dm_thin_endio_hook *h; |
| 379 | |
| 380 | if (bio->bi_rw & REQ_DISCARD) |
| 381 | return; |
| 382 | |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 383 | h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 384 | h->all_io_entry = dm_deferred_entry_inc(pool->all_io_ds); |
| 385 | } |
| 386 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 387 | static void issue(struct thin_c *tc, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 388 | { |
| 389 | struct pool *pool = tc->pool; |
| 390 | unsigned long flags; |
| 391 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 392 | if (!bio_triggers_commit(tc, bio)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 393 | generic_make_request(bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 394 | return; |
| 395 | } |
| 396 | |
| 397 | /* |
| 398 | * Complete bio with an error if earlier I/O caused changes to |
| 399 | * the metadata that can't be committed e.g, due to I/O errors |
| 400 | * on the metadata device. |
| 401 | */ |
| 402 | if (dm_thin_aborted_changes(tc->td)) { |
| 403 | bio_io_error(bio); |
| 404 | return; |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | * Batch together any bios that trigger commits and then issue a |
| 409 | * single commit for them in process_deferred_bios(). |
| 410 | */ |
| 411 | spin_lock_irqsave(&pool->lock, flags); |
| 412 | bio_list_add(&pool->deferred_flush_bios, bio); |
| 413 | spin_unlock_irqrestore(&pool->lock, flags); |
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_and_issue(struct thin_c *tc, struct bio *bio) |
| 417 | { |
| 418 | remap_to_origin(tc, bio); |
| 419 | issue(tc, bio); |
| 420 | } |
| 421 | |
| 422 | static void remap_and_issue(struct thin_c *tc, struct bio *bio, |
| 423 | dm_block_t block) |
| 424 | { |
| 425 | remap(tc, bio, block); |
| 426 | issue(tc, bio); |
| 427 | } |
| 428 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 429 | /* |
| 430 | * wake_worker() is used when new work is queued and when pool_resume is |
| 431 | * ready to continue deferred IO processing. |
| 432 | */ |
| 433 | static void wake_worker(struct pool *pool) |
| 434 | { |
| 435 | queue_work(pool->wq, &pool->worker); |
| 436 | } |
| 437 | |
| 438 | /*----------------------------------------------------------------*/ |
| 439 | |
| 440 | /* |
| 441 | * Bio endio functions. |
| 442 | */ |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 443 | struct dm_thin_new_mapping { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 444 | struct list_head list; |
| 445 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 446 | unsigned quiesced:1; |
| 447 | unsigned prepared:1; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 448 | unsigned pass_discard:1; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 449 | |
| 450 | struct thin_c *tc; |
| 451 | dm_block_t virt_block; |
| 452 | dm_block_t data_block; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 453 | struct dm_bio_prison_cell *cell, *cell2; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 454 | int err; |
| 455 | |
| 456 | /* |
| 457 | * If the bio covers the whole area of a block then we can avoid |
| 458 | * zeroing or copying. Instead this bio is hooked. The bio will |
| 459 | * still be in the cell, so care has to be taken to avoid issuing |
| 460 | * the bio twice. |
| 461 | */ |
| 462 | struct bio *bio; |
| 463 | bio_end_io_t *saved_bi_end_io; |
| 464 | }; |
| 465 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 466 | static void __maybe_add_mapping(struct dm_thin_new_mapping *m) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 467 | { |
| 468 | struct pool *pool = m->tc->pool; |
| 469 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 470 | if (m->quiesced && m->prepared) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 471 | list_add(&m->list, &pool->prepared_mappings); |
| 472 | wake_worker(pool); |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | static void copy_complete(int read_err, unsigned long write_err, void *context) |
| 477 | { |
| 478 | unsigned long flags; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 479 | struct dm_thin_new_mapping *m = context; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 480 | struct pool *pool = m->tc->pool; |
| 481 | |
| 482 | m->err = read_err || write_err ? -EIO : 0; |
| 483 | |
| 484 | spin_lock_irqsave(&pool->lock, flags); |
| 485 | m->prepared = 1; |
| 486 | __maybe_add_mapping(m); |
| 487 | spin_unlock_irqrestore(&pool->lock, flags); |
| 488 | } |
| 489 | |
| 490 | static void overwrite_endio(struct bio *bio, int err) |
| 491 | { |
| 492 | unsigned long flags; |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 493 | 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] | 494 | struct dm_thin_new_mapping *m = h->overwrite_mapping; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 495 | struct pool *pool = m->tc->pool; |
| 496 | |
| 497 | m->err = err; |
| 498 | |
| 499 | spin_lock_irqsave(&pool->lock, flags); |
| 500 | m->prepared = 1; |
| 501 | __maybe_add_mapping(m); |
| 502 | spin_unlock_irqrestore(&pool->lock, flags); |
| 503 | } |
| 504 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 505 | /*----------------------------------------------------------------*/ |
| 506 | |
| 507 | /* |
| 508 | * Workqueue. |
| 509 | */ |
| 510 | |
| 511 | /* |
| 512 | * Prepared mapping jobs. |
| 513 | */ |
| 514 | |
| 515 | /* |
| 516 | * This sends the bios in the cell back to the deferred_bios list. |
| 517 | */ |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 518 | 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] | 519 | { |
| 520 | struct pool *pool = tc->pool; |
| 521 | unsigned long flags; |
| 522 | |
| 523 | spin_lock_irqsave(&pool->lock, flags); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 524 | dm_cell_release(cell, &pool->deferred_bios); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 525 | spin_unlock_irqrestore(&tc->pool->lock, flags); |
| 526 | |
| 527 | wake_worker(pool); |
| 528 | } |
| 529 | |
| 530 | /* |
Joe Thornber | b7ca9c9 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 531 | * Same as cell_defer except it omits the original holder of the cell. |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 532 | */ |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 533 | 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] | 534 | { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 535 | struct pool *pool = tc->pool; |
| 536 | unsigned long flags; |
| 537 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 538 | spin_lock_irqsave(&pool->lock, flags); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 539 | dm_cell_release_no_holder(cell, &pool->deferred_bios); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 540 | spin_unlock_irqrestore(&pool->lock, flags); |
| 541 | |
| 542 | wake_worker(pool); |
| 543 | } |
| 544 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 545 | static void process_prepared_mapping_fail(struct dm_thin_new_mapping *m) |
| 546 | { |
| 547 | if (m->bio) |
| 548 | m->bio->bi_end_io = m->saved_bi_end_io; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 549 | dm_cell_error(m->cell); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 550 | list_del(&m->list); |
| 551 | mempool_free(m, m->tc->pool->mapping_pool); |
| 552 | } |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 553 | static void process_prepared_mapping(struct dm_thin_new_mapping *m) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 554 | { |
| 555 | struct thin_c *tc = m->tc; |
| 556 | struct bio *bio; |
| 557 | int r; |
| 558 | |
| 559 | bio = m->bio; |
| 560 | if (bio) |
| 561 | bio->bi_end_io = m->saved_bi_end_io; |
| 562 | |
| 563 | if (m->err) { |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 564 | dm_cell_error(m->cell); |
Joe Thornber | 905386f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 565 | goto out; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 566 | } |
| 567 | |
| 568 | /* |
| 569 | * Commit the prepared block into the mapping btree. |
| 570 | * Any I/O for this block arriving after this point will get |
| 571 | * remapped to it directly. |
| 572 | */ |
| 573 | r = dm_thin_insert_block(tc->td, m->virt_block, m->data_block); |
| 574 | if (r) { |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 575 | DMERR_LIMIT("dm_thin_insert_block() failed"); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 576 | dm_cell_error(m->cell); |
Joe Thornber | 905386f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 577 | goto out; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 578 | } |
| 579 | |
| 580 | /* |
| 581 | * Release any bios held while the block was being provisioned. |
| 582 | * If we are processing a write bio that completely covers the block, |
| 583 | * we already processed it so can ignore it now when processing |
| 584 | * the bios in the cell. |
| 585 | */ |
| 586 | if (bio) { |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 587 | cell_defer_no_holder(tc, m->cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 588 | bio_endio(bio, 0); |
| 589 | } else |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 590 | cell_defer(tc, m->cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 591 | |
Joe Thornber | 905386f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 592 | out: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 593 | list_del(&m->list); |
| 594 | mempool_free(m, tc->pool->mapping_pool); |
| 595 | } |
| 596 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 597 | static void process_prepared_discard_fail(struct dm_thin_new_mapping *m) |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 598 | { |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 599 | struct thin_c *tc = m->tc; |
| 600 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 601 | bio_io_error(m->bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 602 | cell_defer_no_holder(tc, m->cell); |
| 603 | cell_defer_no_holder(tc, m->cell2); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 604 | mempool_free(m, tc->pool->mapping_pool); |
| 605 | } |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 606 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 607 | static void process_prepared_discard_passdown(struct dm_thin_new_mapping *m) |
| 608 | { |
| 609 | struct thin_c *tc = m->tc; |
| 610 | |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 611 | inc_all_io_entry(tc->pool, m->bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 612 | cell_defer_no_holder(tc, m->cell); |
| 613 | cell_defer_no_holder(tc, m->cell2); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 614 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 615 | if (m->pass_discard) |
| 616 | remap_and_issue(tc, m->bio, m->data_block); |
| 617 | else |
| 618 | bio_endio(m->bio, 0); |
| 619 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 620 | mempool_free(m, tc->pool->mapping_pool); |
| 621 | } |
| 622 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 623 | static void process_prepared_discard(struct dm_thin_new_mapping *m) |
| 624 | { |
| 625 | int r; |
| 626 | struct thin_c *tc = m->tc; |
| 627 | |
| 628 | r = dm_thin_remove_block(tc->td, m->virt_block); |
| 629 | if (r) |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 630 | DMERR_LIMIT("dm_thin_remove_block() failed"); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 631 | |
| 632 | process_prepared_discard_passdown(m); |
| 633 | } |
| 634 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 635 | static void process_prepared(struct pool *pool, struct list_head *head, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 636 | process_mapping_fn *fn) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 637 | { |
| 638 | unsigned long flags; |
| 639 | struct list_head maps; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 640 | struct dm_thin_new_mapping *m, *tmp; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 641 | |
| 642 | INIT_LIST_HEAD(&maps); |
| 643 | spin_lock_irqsave(&pool->lock, flags); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 644 | list_splice_init(head, &maps); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 645 | spin_unlock_irqrestore(&pool->lock, flags); |
| 646 | |
| 647 | list_for_each_entry_safe(m, tmp, &maps, list) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 648 | (*fn)(m); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | /* |
| 652 | * Deferred bio jobs. |
| 653 | */ |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 654 | static int io_overlaps_block(struct pool *pool, struct bio *bio) |
| 655 | { |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 656 | return bio->bi_size == (pool->sectors_per_block << SECTOR_SHIFT); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 657 | } |
| 658 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 659 | static int io_overwrites_block(struct pool *pool, struct bio *bio) |
| 660 | { |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 661 | return (bio_data_dir(bio) == WRITE) && |
| 662 | io_overlaps_block(pool, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 663 | } |
| 664 | |
| 665 | static void save_and_set_endio(struct bio *bio, bio_end_io_t **save, |
| 666 | bio_end_io_t *fn) |
| 667 | { |
| 668 | *save = bio->bi_end_io; |
| 669 | bio->bi_end_io = fn; |
| 670 | } |
| 671 | |
| 672 | static int ensure_next_mapping(struct pool *pool) |
| 673 | { |
| 674 | if (pool->next_mapping) |
| 675 | return 0; |
| 676 | |
| 677 | pool->next_mapping = mempool_alloc(pool->mapping_pool, GFP_ATOMIC); |
| 678 | |
| 679 | return pool->next_mapping ? 0 : -ENOMEM; |
| 680 | } |
| 681 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 682 | static struct dm_thin_new_mapping *get_next_mapping(struct pool *pool) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 683 | { |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 684 | struct dm_thin_new_mapping *r = pool->next_mapping; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 685 | |
| 686 | BUG_ON(!pool->next_mapping); |
| 687 | |
| 688 | pool->next_mapping = NULL; |
| 689 | |
| 690 | return r; |
| 691 | } |
| 692 | |
| 693 | 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] | 694 | struct dm_dev *origin, dm_block_t data_origin, |
| 695 | dm_block_t data_dest, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 696 | struct dm_bio_prison_cell *cell, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 697 | { |
| 698 | int r; |
| 699 | struct pool *pool = tc->pool; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 700 | struct dm_thin_new_mapping *m = get_next_mapping(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 701 | |
| 702 | INIT_LIST_HEAD(&m->list); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 703 | m->quiesced = 0; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 704 | m->prepared = 0; |
| 705 | m->tc = tc; |
| 706 | m->virt_block = virt_block; |
| 707 | m->data_block = data_dest; |
| 708 | m->cell = cell; |
| 709 | m->err = 0; |
| 710 | m->bio = NULL; |
| 711 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 712 | if (!dm_deferred_set_add_work(pool->shared_read_ds, &m->list)) |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 713 | m->quiesced = 1; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 714 | |
| 715 | /* |
| 716 | * IO to pool_dev remaps to the pool target's data_dev. |
| 717 | * |
| 718 | * If the whole block of data is being overwritten, we can issue the |
| 719 | * bio immediately. Otherwise we use kcopyd to clone the data first. |
| 720 | */ |
| 721 | if (io_overwrites_block(pool, bio)) { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 722 | 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] | 723 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 724 | h->overwrite_mapping = m; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 725 | m->bio = bio; |
| 726 | save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 727 | inc_all_io_entry(pool, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 728 | remap_and_issue(tc, bio, data_dest); |
| 729 | } else { |
| 730 | struct dm_io_region from, to; |
| 731 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 732 | from.bdev = origin->bdev; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 733 | from.sector = data_origin * pool->sectors_per_block; |
| 734 | from.count = pool->sectors_per_block; |
| 735 | |
| 736 | to.bdev = tc->pool_dev->bdev; |
| 737 | to.sector = data_dest * pool->sectors_per_block; |
| 738 | to.count = pool->sectors_per_block; |
| 739 | |
| 740 | r = dm_kcopyd_copy(pool->copier, &from, 1, &to, |
| 741 | 0, copy_complete, m); |
| 742 | if (r < 0) { |
| 743 | mempool_free(m, pool->mapping_pool); |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 744 | DMERR_LIMIT("dm_kcopyd_copy() failed"); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 745 | dm_cell_error(cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 746 | } |
| 747 | } |
| 748 | } |
| 749 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 750 | static void schedule_internal_copy(struct thin_c *tc, dm_block_t virt_block, |
| 751 | dm_block_t data_origin, dm_block_t data_dest, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 752 | struct dm_bio_prison_cell *cell, struct bio *bio) |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 753 | { |
| 754 | schedule_copy(tc, virt_block, tc->pool_dev, |
| 755 | data_origin, data_dest, cell, bio); |
| 756 | } |
| 757 | |
| 758 | static void schedule_external_copy(struct thin_c *tc, dm_block_t virt_block, |
| 759 | dm_block_t data_dest, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 760 | struct dm_bio_prison_cell *cell, struct bio *bio) |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 761 | { |
| 762 | schedule_copy(tc, virt_block, tc->origin_dev, |
| 763 | virt_block, data_dest, cell, bio); |
| 764 | } |
| 765 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 766 | 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] | 767 | dm_block_t data_block, struct dm_bio_prison_cell *cell, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 768 | struct bio *bio) |
| 769 | { |
| 770 | struct pool *pool = tc->pool; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 771 | struct dm_thin_new_mapping *m = get_next_mapping(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 772 | |
| 773 | INIT_LIST_HEAD(&m->list); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 774 | m->quiesced = 1; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 775 | m->prepared = 0; |
| 776 | m->tc = tc; |
| 777 | m->virt_block = virt_block; |
| 778 | m->data_block = data_block; |
| 779 | m->cell = cell; |
| 780 | m->err = 0; |
| 781 | m->bio = NULL; |
| 782 | |
| 783 | /* |
| 784 | * If the whole block of data is being overwritten or we are not |
| 785 | * zeroing pre-existing data, we can issue the bio immediately. |
| 786 | * Otherwise we use kcopyd to zero the data first. |
| 787 | */ |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 788 | if (!pool->pf.zero_new_blocks) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 789 | process_prepared_mapping(m); |
| 790 | |
| 791 | else if (io_overwrites_block(pool, bio)) { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 792 | 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] | 793 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 794 | h->overwrite_mapping = m; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 795 | m->bio = bio; |
| 796 | save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 797 | inc_all_io_entry(pool, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 798 | remap_and_issue(tc, bio, data_block); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 799 | } else { |
| 800 | int r; |
| 801 | struct dm_io_region to; |
| 802 | |
| 803 | to.bdev = tc->pool_dev->bdev; |
| 804 | to.sector = data_block * pool->sectors_per_block; |
| 805 | to.count = pool->sectors_per_block; |
| 806 | |
| 807 | r = dm_kcopyd_zero(pool->copier, 1, &to, 0, copy_complete, m); |
| 808 | if (r < 0) { |
| 809 | mempool_free(m, pool->mapping_pool); |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 810 | DMERR_LIMIT("dm_kcopyd_zero() failed"); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 811 | dm_cell_error(cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 812 | } |
| 813 | } |
| 814 | } |
| 815 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 816 | static int commit(struct pool *pool) |
| 817 | { |
| 818 | int r; |
| 819 | |
| 820 | r = dm_pool_commit_metadata(pool->pmd); |
| 821 | if (r) |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 822 | DMERR_LIMIT("commit failed: error = %d", r); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 823 | |
| 824 | return r; |
| 825 | } |
| 826 | |
| 827 | /* |
| 828 | * A non-zero return indicates read_only or fail_io mode. |
| 829 | * Many callers don't care about the return value. |
| 830 | */ |
| 831 | static int commit_or_fallback(struct pool *pool) |
| 832 | { |
| 833 | int r; |
| 834 | |
| 835 | if (get_pool_mode(pool) != PM_WRITE) |
| 836 | return -EINVAL; |
| 837 | |
| 838 | r = commit(pool); |
| 839 | if (r) |
| 840 | set_pool_mode(pool, PM_READ_ONLY); |
| 841 | |
| 842 | return r; |
| 843 | } |
| 844 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 845 | static int alloc_data_block(struct thin_c *tc, dm_block_t *result) |
| 846 | { |
| 847 | int r; |
| 848 | dm_block_t free_blocks; |
| 849 | unsigned long flags; |
| 850 | struct pool *pool = tc->pool; |
| 851 | |
| 852 | r = dm_pool_get_free_block_count(pool->pmd, &free_blocks); |
| 853 | if (r) |
| 854 | return r; |
| 855 | |
| 856 | if (free_blocks <= pool->low_water_blocks && !pool->low_water_triggered) { |
| 857 | DMWARN("%s: reached low water mark, sending event.", |
| 858 | dm_device_name(pool->pool_md)); |
| 859 | spin_lock_irqsave(&pool->lock, flags); |
| 860 | pool->low_water_triggered = 1; |
| 861 | spin_unlock_irqrestore(&pool->lock, flags); |
| 862 | dm_table_event(pool->ti->table); |
| 863 | } |
| 864 | |
| 865 | if (!free_blocks) { |
| 866 | if (pool->no_free_space) |
| 867 | return -ENOSPC; |
| 868 | else { |
| 869 | /* |
| 870 | * Try to commit to see if that will free up some |
| 871 | * more space. |
| 872 | */ |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 873 | (void) commit_or_fallback(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 874 | |
| 875 | r = dm_pool_get_free_block_count(pool->pmd, &free_blocks); |
| 876 | if (r) |
| 877 | return r; |
| 878 | |
| 879 | /* |
| 880 | * If we still have no space we set a flag to avoid |
| 881 | * doing all this checking and return -ENOSPC. |
| 882 | */ |
| 883 | if (!free_blocks) { |
| 884 | DMWARN("%s: no free space available.", |
| 885 | dm_device_name(pool->pool_md)); |
| 886 | spin_lock_irqsave(&pool->lock, flags); |
| 887 | pool->no_free_space = 1; |
| 888 | spin_unlock_irqrestore(&pool->lock, flags); |
| 889 | return -ENOSPC; |
| 890 | } |
| 891 | } |
| 892 | } |
| 893 | |
| 894 | r = dm_pool_alloc_data_block(pool->pmd, result); |
| 895 | if (r) |
| 896 | return r; |
| 897 | |
| 898 | return 0; |
| 899 | } |
| 900 | |
| 901 | /* |
| 902 | * If we have run out of space, queue bios until the device is |
| 903 | * resumed, presumably after having been reloaded with more space. |
| 904 | */ |
| 905 | static void retry_on_resume(struct bio *bio) |
| 906 | { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 907 | 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] | 908 | struct thin_c *tc = h->tc; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 909 | struct pool *pool = tc->pool; |
| 910 | unsigned long flags; |
| 911 | |
| 912 | spin_lock_irqsave(&pool->lock, flags); |
| 913 | bio_list_add(&pool->retry_on_resume_list, bio); |
| 914 | spin_unlock_irqrestore(&pool->lock, flags); |
| 915 | } |
| 916 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 917 | static void no_space(struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 918 | { |
| 919 | struct bio *bio; |
| 920 | struct bio_list bios; |
| 921 | |
| 922 | bio_list_init(&bios); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 923 | dm_cell_release(cell, &bios); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 924 | |
| 925 | while ((bio = bio_list_pop(&bios))) |
| 926 | retry_on_resume(bio); |
| 927 | } |
| 928 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 929 | static void process_discard(struct thin_c *tc, struct bio *bio) |
| 930 | { |
| 931 | int r; |
Mike Snitzer | c3a0ce2 | 2012-05-12 01:43:16 +0100 | [diff] [blame] | 932 | unsigned long flags; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 933 | struct pool *pool = tc->pool; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 934 | struct dm_bio_prison_cell *cell, *cell2; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 935 | struct dm_cell_key key, key2; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 936 | dm_block_t block = get_bio_block(tc, bio); |
| 937 | struct dm_thin_lookup_result lookup_result; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 938 | struct dm_thin_new_mapping *m; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 939 | |
| 940 | build_virtual_key(tc->td, block, &key); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 941 | if (dm_bio_detain(tc->pool->prison, &key, bio, &cell)) |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 942 | return; |
| 943 | |
| 944 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); |
| 945 | switch (r) { |
| 946 | case 0: |
| 947 | /* |
| 948 | * Check nobody is fiddling with this pool block. This can |
| 949 | * happen if someone's in the process of breaking sharing |
| 950 | * on this block. |
| 951 | */ |
| 952 | build_data_key(tc->td, lookup_result.block, &key2); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 953 | if (dm_bio_detain(tc->pool->prison, &key2, bio, &cell2)) { |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 954 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 955 | break; |
| 956 | } |
| 957 | |
| 958 | if (io_overlaps_block(pool, bio)) { |
| 959 | /* |
| 960 | * IO may still be going to the destination block. We must |
| 961 | * quiesce before we can do the removal. |
| 962 | */ |
| 963 | m = get_next_mapping(pool); |
| 964 | m->tc = tc; |
Mike Snitzer | 17b7d63 | 2012-07-27 15:07:57 +0100 | [diff] [blame] | 965 | m->pass_discard = (!lookup_result.shared) && pool->pf.discard_passdown; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 966 | m->virt_block = block; |
| 967 | m->data_block = lookup_result.block; |
| 968 | m->cell = cell; |
| 969 | m->cell2 = cell2; |
| 970 | m->err = 0; |
| 971 | m->bio = bio; |
| 972 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 973 | if (!dm_deferred_set_add_work(pool->all_io_ds, &m->list)) { |
Mike Snitzer | c3a0ce2 | 2012-05-12 01:43:16 +0100 | [diff] [blame] | 974 | spin_lock_irqsave(&pool->lock, flags); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 975 | list_add(&m->list, &pool->prepared_discards); |
Mike Snitzer | c3a0ce2 | 2012-05-12 01:43:16 +0100 | [diff] [blame] | 976 | spin_unlock_irqrestore(&pool->lock, flags); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 977 | wake_worker(pool); |
| 978 | } |
| 979 | } else { |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 980 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 981 | cell_defer_no_holder(tc, cell); |
| 982 | cell_defer_no_holder(tc, cell2); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 983 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 984 | /* |
Mikulas Patocka | 4929630 | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 985 | * The DM core makes sure that the discard doesn't span |
| 986 | * a block boundary. So we submit the discard of a |
| 987 | * partial block appropriately. |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 988 | */ |
Mikulas Patocka | 650d2a0 | 2012-07-20 14:25:05 +0100 | [diff] [blame] | 989 | if ((!lookup_result.shared) && pool->pf.discard_passdown) |
| 990 | remap_and_issue(tc, bio, lookup_result.block); |
| 991 | else |
| 992 | bio_endio(bio, 0); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 993 | } |
| 994 | break; |
| 995 | |
| 996 | case -ENODATA: |
| 997 | /* |
| 998 | * It isn't provisioned, just forget it. |
| 999 | */ |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1000 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1001 | bio_endio(bio, 0); |
| 1002 | break; |
| 1003 | |
| 1004 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1005 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
| 1006 | __func__, r); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1007 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1008 | bio_io_error(bio); |
| 1009 | break; |
| 1010 | } |
| 1011 | } |
| 1012 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1013 | 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] | 1014 | struct dm_cell_key *key, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1015 | struct dm_thin_lookup_result *lookup_result, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1016 | struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1017 | { |
| 1018 | int r; |
| 1019 | dm_block_t data_block; |
| 1020 | |
| 1021 | r = alloc_data_block(tc, &data_block); |
| 1022 | switch (r) { |
| 1023 | case 0: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1024 | schedule_internal_copy(tc, block, lookup_result->block, |
| 1025 | data_block, cell, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1026 | break; |
| 1027 | |
| 1028 | case -ENOSPC: |
| 1029 | no_space(cell); |
| 1030 | break; |
| 1031 | |
| 1032 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1033 | DMERR_LIMIT("%s: alloc_data_block() failed: error = %d", |
| 1034 | __func__, r); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1035 | dm_cell_error(cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1036 | break; |
| 1037 | } |
| 1038 | } |
| 1039 | |
| 1040 | static void process_shared_bio(struct thin_c *tc, struct bio *bio, |
| 1041 | dm_block_t block, |
| 1042 | struct dm_thin_lookup_result *lookup_result) |
| 1043 | { |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1044 | struct dm_bio_prison_cell *cell; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1045 | struct pool *pool = tc->pool; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1046 | struct dm_cell_key key; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1047 | |
| 1048 | /* |
| 1049 | * If cell is already occupied, then sharing is already in the process |
| 1050 | * of being broken so we have nothing further to do here. |
| 1051 | */ |
| 1052 | build_data_key(tc->td, lookup_result->block, &key); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1053 | if (dm_bio_detain(pool->prison, &key, bio, &cell)) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1054 | return; |
| 1055 | |
Joe Thornber | 6004970 | 2012-07-27 15:08:06 +0100 | [diff] [blame] | 1056 | if (bio_data_dir(bio) == WRITE && bio->bi_size) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1057 | break_sharing(tc, bio, block, &key, lookup_result, cell); |
| 1058 | else { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1059 | 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] | 1060 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1061 | h->shared_read_entry = dm_deferred_entry_inc(pool->shared_read_ds); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1062 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1063 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1064 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1065 | remap_and_issue(tc, bio, lookup_result->block); |
| 1066 | } |
| 1067 | } |
| 1068 | |
| 1069 | 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] | 1070 | struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1071 | { |
| 1072 | int r; |
| 1073 | dm_block_t data_block; |
| 1074 | |
| 1075 | /* |
| 1076 | * Remap empty bios (flushes) immediately, without provisioning. |
| 1077 | */ |
| 1078 | if (!bio->bi_size) { |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1079 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1080 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1081 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1082 | remap_and_issue(tc, bio, 0); |
| 1083 | return; |
| 1084 | } |
| 1085 | |
| 1086 | /* |
| 1087 | * Fill read bios with zeroes and complete them immediately. |
| 1088 | */ |
| 1089 | if (bio_data_dir(bio) == READ) { |
| 1090 | zero_fill_bio(bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1091 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1092 | bio_endio(bio, 0); |
| 1093 | return; |
| 1094 | } |
| 1095 | |
| 1096 | r = alloc_data_block(tc, &data_block); |
| 1097 | switch (r) { |
| 1098 | case 0: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1099 | if (tc->origin_dev) |
| 1100 | schedule_external_copy(tc, block, data_block, cell, bio); |
| 1101 | else |
| 1102 | schedule_zero(tc, block, data_block, cell, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1103 | break; |
| 1104 | |
| 1105 | case -ENOSPC: |
| 1106 | no_space(cell); |
| 1107 | break; |
| 1108 | |
| 1109 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1110 | DMERR_LIMIT("%s: alloc_data_block() failed: error = %d", |
| 1111 | __func__, r); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1112 | set_pool_mode(tc->pool, PM_READ_ONLY); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1113 | dm_cell_error(cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1114 | break; |
| 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | static void process_bio(struct thin_c *tc, struct bio *bio) |
| 1119 | { |
| 1120 | int r; |
| 1121 | dm_block_t block = get_bio_block(tc, bio); |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1122 | struct dm_bio_prison_cell *cell; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1123 | struct dm_cell_key key; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1124 | struct dm_thin_lookup_result lookup_result; |
| 1125 | |
| 1126 | /* |
| 1127 | * If cell is already occupied, then the block is already |
| 1128 | * being provisioned so we have nothing further to do here. |
| 1129 | */ |
| 1130 | build_virtual_key(tc->td, block, &key); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1131 | if (dm_bio_detain(tc->pool->prison, &key, bio, &cell)) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1132 | return; |
| 1133 | |
| 1134 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); |
| 1135 | switch (r) { |
| 1136 | case 0: |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1137 | if (lookup_result.shared) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1138 | process_shared_bio(tc, bio, block, &lookup_result); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1139 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1140 | } else { |
| 1141 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1142 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1143 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1144 | remap_and_issue(tc, bio, lookup_result.block); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1145 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1146 | break; |
| 1147 | |
| 1148 | case -ENODATA: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1149 | if (bio_data_dir(bio) == READ && tc->origin_dev) { |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1150 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1151 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1152 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1153 | remap_to_origin_and_issue(tc, bio); |
| 1154 | } else |
| 1155 | provision_block(tc, bio, block, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1156 | break; |
| 1157 | |
| 1158 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1159 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
| 1160 | __func__, r); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1161 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1162 | bio_io_error(bio); |
| 1163 | break; |
| 1164 | } |
| 1165 | } |
| 1166 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1167 | static void process_bio_read_only(struct thin_c *tc, struct bio *bio) |
| 1168 | { |
| 1169 | int r; |
| 1170 | int rw = bio_data_dir(bio); |
| 1171 | dm_block_t block = get_bio_block(tc, bio); |
| 1172 | struct dm_thin_lookup_result lookup_result; |
| 1173 | |
| 1174 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); |
| 1175 | switch (r) { |
| 1176 | case 0: |
| 1177 | if (lookup_result.shared && (rw == WRITE) && bio->bi_size) |
| 1178 | bio_io_error(bio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1179 | else { |
| 1180 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1181 | remap_and_issue(tc, bio, lookup_result.block); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1182 | } |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1183 | break; |
| 1184 | |
| 1185 | case -ENODATA: |
| 1186 | if (rw != READ) { |
| 1187 | bio_io_error(bio); |
| 1188 | break; |
| 1189 | } |
| 1190 | |
| 1191 | if (tc->origin_dev) { |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1192 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1193 | remap_to_origin_and_issue(tc, bio); |
| 1194 | break; |
| 1195 | } |
| 1196 | |
| 1197 | zero_fill_bio(bio); |
| 1198 | bio_endio(bio, 0); |
| 1199 | break; |
| 1200 | |
| 1201 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1202 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
| 1203 | __func__, r); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1204 | bio_io_error(bio); |
| 1205 | break; |
| 1206 | } |
| 1207 | } |
| 1208 | |
| 1209 | static void process_bio_fail(struct thin_c *tc, struct bio *bio) |
| 1210 | { |
| 1211 | bio_io_error(bio); |
| 1212 | } |
| 1213 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1214 | static int need_commit_due_to_time(struct pool *pool) |
| 1215 | { |
| 1216 | return jiffies < pool->last_commit_jiffies || |
| 1217 | jiffies > pool->last_commit_jiffies + COMMIT_PERIOD; |
| 1218 | } |
| 1219 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1220 | static void process_deferred_bios(struct pool *pool) |
| 1221 | { |
| 1222 | unsigned long flags; |
| 1223 | struct bio *bio; |
| 1224 | struct bio_list bios; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1225 | |
| 1226 | bio_list_init(&bios); |
| 1227 | |
| 1228 | spin_lock_irqsave(&pool->lock, flags); |
| 1229 | bio_list_merge(&bios, &pool->deferred_bios); |
| 1230 | bio_list_init(&pool->deferred_bios); |
| 1231 | spin_unlock_irqrestore(&pool->lock, flags); |
| 1232 | |
| 1233 | while ((bio = bio_list_pop(&bios))) { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1234 | 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] | 1235 | struct thin_c *tc = h->tc; |
| 1236 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1237 | /* |
| 1238 | * If we've got no free new_mapping structs, and processing |
| 1239 | * this bio might require one, we pause until there are some |
| 1240 | * prepared mappings to process. |
| 1241 | */ |
| 1242 | if (ensure_next_mapping(pool)) { |
| 1243 | spin_lock_irqsave(&pool->lock, flags); |
| 1244 | bio_list_merge(&pool->deferred_bios, &bios); |
| 1245 | spin_unlock_irqrestore(&pool->lock, flags); |
| 1246 | |
| 1247 | break; |
| 1248 | } |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1249 | |
| 1250 | if (bio->bi_rw & REQ_DISCARD) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1251 | pool->process_discard(tc, bio); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1252 | else |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1253 | pool->process_bio(tc, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1254 | } |
| 1255 | |
| 1256 | /* |
| 1257 | * If there are any deferred flush bios, we must commit |
| 1258 | * the metadata before issuing them. |
| 1259 | */ |
| 1260 | bio_list_init(&bios); |
| 1261 | spin_lock_irqsave(&pool->lock, flags); |
| 1262 | bio_list_merge(&bios, &pool->deferred_flush_bios); |
| 1263 | bio_list_init(&pool->deferred_flush_bios); |
| 1264 | spin_unlock_irqrestore(&pool->lock, flags); |
| 1265 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1266 | if (bio_list_empty(&bios) && !need_commit_due_to_time(pool)) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1267 | return; |
| 1268 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1269 | if (commit_or_fallback(pool)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1270 | while ((bio = bio_list_pop(&bios))) |
| 1271 | bio_io_error(bio); |
| 1272 | return; |
| 1273 | } |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1274 | pool->last_commit_jiffies = jiffies; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1275 | |
| 1276 | while ((bio = bio_list_pop(&bios))) |
| 1277 | generic_make_request(bio); |
| 1278 | } |
| 1279 | |
| 1280 | static void do_worker(struct work_struct *ws) |
| 1281 | { |
| 1282 | struct pool *pool = container_of(ws, struct pool, worker); |
| 1283 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1284 | process_prepared(pool, &pool->prepared_mappings, &pool->process_prepared_mapping); |
| 1285 | process_prepared(pool, &pool->prepared_discards, &pool->process_prepared_discard); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1286 | process_deferred_bios(pool); |
| 1287 | } |
| 1288 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1289 | /* |
| 1290 | * We want to commit periodically so that not too much |
| 1291 | * unwritten data builds up. |
| 1292 | */ |
| 1293 | static void do_waker(struct work_struct *ws) |
| 1294 | { |
| 1295 | struct pool *pool = container_of(to_delayed_work(ws), struct pool, waker); |
| 1296 | wake_worker(pool); |
| 1297 | queue_delayed_work(pool->wq, &pool->waker, COMMIT_PERIOD); |
| 1298 | } |
| 1299 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1300 | /*----------------------------------------------------------------*/ |
| 1301 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1302 | static enum pool_mode get_pool_mode(struct pool *pool) |
| 1303 | { |
| 1304 | return pool->pf.mode; |
| 1305 | } |
| 1306 | |
| 1307 | static void set_pool_mode(struct pool *pool, enum pool_mode mode) |
| 1308 | { |
| 1309 | int r; |
| 1310 | |
| 1311 | pool->pf.mode = mode; |
| 1312 | |
| 1313 | switch (mode) { |
| 1314 | case PM_FAIL: |
| 1315 | DMERR("switching pool to failure mode"); |
| 1316 | pool->process_bio = process_bio_fail; |
| 1317 | pool->process_discard = process_bio_fail; |
| 1318 | pool->process_prepared_mapping = process_prepared_mapping_fail; |
| 1319 | pool->process_prepared_discard = process_prepared_discard_fail; |
| 1320 | break; |
| 1321 | |
| 1322 | case PM_READ_ONLY: |
| 1323 | DMERR("switching pool to read-only mode"); |
| 1324 | r = dm_pool_abort_metadata(pool->pmd); |
| 1325 | if (r) { |
| 1326 | DMERR("aborting transaction failed"); |
| 1327 | set_pool_mode(pool, PM_FAIL); |
| 1328 | } else { |
| 1329 | dm_pool_metadata_read_only(pool->pmd); |
| 1330 | pool->process_bio = process_bio_read_only; |
| 1331 | pool->process_discard = process_discard; |
| 1332 | pool->process_prepared_mapping = process_prepared_mapping_fail; |
| 1333 | pool->process_prepared_discard = process_prepared_discard_passdown; |
| 1334 | } |
| 1335 | break; |
| 1336 | |
| 1337 | case PM_WRITE: |
| 1338 | pool->process_bio = process_bio; |
| 1339 | pool->process_discard = process_discard; |
| 1340 | pool->process_prepared_mapping = process_prepared_mapping; |
| 1341 | pool->process_prepared_discard = process_prepared_discard; |
| 1342 | break; |
| 1343 | } |
| 1344 | } |
| 1345 | |
| 1346 | /*----------------------------------------------------------------*/ |
| 1347 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1348 | /* |
| 1349 | * Mapping functions. |
| 1350 | */ |
| 1351 | |
| 1352 | /* |
| 1353 | * Called only while mapping a thin bio to hand it over to the workqueue. |
| 1354 | */ |
| 1355 | static void thin_defer_bio(struct thin_c *tc, struct bio *bio) |
| 1356 | { |
| 1357 | unsigned long flags; |
| 1358 | struct pool *pool = tc->pool; |
| 1359 | |
| 1360 | spin_lock_irqsave(&pool->lock, flags); |
| 1361 | bio_list_add(&pool->deferred_bios, bio); |
| 1362 | spin_unlock_irqrestore(&pool->lock, flags); |
| 1363 | |
| 1364 | wake_worker(pool); |
| 1365 | } |
| 1366 | |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1367 | static void thin_hook_bio(struct thin_c *tc, struct bio *bio) |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1368 | { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1369 | 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] | 1370 | |
| 1371 | h->tc = tc; |
| 1372 | h->shared_read_entry = NULL; |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1373 | h->all_io_entry = NULL; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1374 | h->overwrite_mapping = NULL; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1375 | } |
| 1376 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1377 | /* |
| 1378 | * Non-blocking function called from the thin target's map function. |
| 1379 | */ |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 1380 | static int thin_bio_map(struct dm_target *ti, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1381 | { |
| 1382 | int r; |
| 1383 | struct thin_c *tc = ti->private; |
| 1384 | dm_block_t block = get_bio_block(tc, bio); |
| 1385 | struct dm_thin_device *td = tc->td; |
| 1386 | struct dm_thin_lookup_result result; |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1387 | struct dm_bio_prison_cell *cell1, *cell2; |
| 1388 | struct dm_cell_key key; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1389 | |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1390 | thin_hook_bio(tc, bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1391 | |
| 1392 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
| 1393 | bio_io_error(bio); |
| 1394 | return DM_MAPIO_SUBMITTED; |
| 1395 | } |
| 1396 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1397 | if (bio->bi_rw & (REQ_DISCARD | REQ_FLUSH | REQ_FUA)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1398 | thin_defer_bio(tc, bio); |
| 1399 | return DM_MAPIO_SUBMITTED; |
| 1400 | } |
| 1401 | |
| 1402 | r = dm_thin_find_block(td, block, 0, &result); |
| 1403 | |
| 1404 | /* |
| 1405 | * Note that we defer readahead too. |
| 1406 | */ |
| 1407 | switch (r) { |
| 1408 | case 0: |
| 1409 | if (unlikely(result.shared)) { |
| 1410 | /* |
| 1411 | * We have a race condition here between the |
| 1412 | * result.shared value returned by the lookup and |
| 1413 | * snapshot creation, which may cause new |
| 1414 | * sharing. |
| 1415 | * |
| 1416 | * To avoid this always quiesce the origin before |
| 1417 | * taking the snap. You want to do this anyway to |
| 1418 | * ensure a consistent application view |
| 1419 | * (i.e. lockfs). |
| 1420 | * |
| 1421 | * More distant ancestors are irrelevant. The |
| 1422 | * shared flag will be set in their case. |
| 1423 | */ |
| 1424 | thin_defer_bio(tc, bio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1425 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1426 | } |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1427 | |
| 1428 | build_virtual_key(tc->td, block, &key); |
| 1429 | if (dm_bio_detain(tc->pool->prison, &key, bio, &cell1)) |
| 1430 | return DM_MAPIO_SUBMITTED; |
| 1431 | |
| 1432 | build_data_key(tc->td, result.block, &key); |
| 1433 | if (dm_bio_detain(tc->pool->prison, &key, bio, &cell2)) { |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1434 | cell_defer_no_holder(tc, cell1); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1435 | return DM_MAPIO_SUBMITTED; |
| 1436 | } |
| 1437 | |
| 1438 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1439 | cell_defer_no_holder(tc, cell2); |
| 1440 | cell_defer_no_holder(tc, cell1); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1441 | |
| 1442 | remap(tc, bio, result.block); |
| 1443 | return DM_MAPIO_REMAPPED; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1444 | |
| 1445 | case -ENODATA: |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1446 | if (get_pool_mode(tc->pool) == PM_READ_ONLY) { |
| 1447 | /* |
| 1448 | * This block isn't provisioned, and we have no way |
| 1449 | * of doing so. Just error it. |
| 1450 | */ |
| 1451 | bio_io_error(bio); |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1452 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1453 | } |
| 1454 | /* fall through */ |
| 1455 | |
| 1456 | case -EWOULDBLOCK: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1457 | /* |
| 1458 | * In future, the failed dm_thin_find_block above could |
| 1459 | * provide the hint to load the metadata into cache. |
| 1460 | */ |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1461 | thin_defer_bio(tc, bio); |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1462 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1463 | |
| 1464 | default: |
| 1465 | /* |
| 1466 | * Must always call bio_io_error on failure. |
| 1467 | * dm_thin_find_block can fail with -EINVAL if the |
| 1468 | * pool is switched to fail-io mode. |
| 1469 | */ |
| 1470 | bio_io_error(bio); |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1471 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1472 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1473 | } |
| 1474 | |
| 1475 | static int pool_is_congested(struct dm_target_callbacks *cb, int bdi_bits) |
| 1476 | { |
| 1477 | int r; |
| 1478 | unsigned long flags; |
| 1479 | struct pool_c *pt = container_of(cb, struct pool_c, callbacks); |
| 1480 | |
| 1481 | spin_lock_irqsave(&pt->pool->lock, flags); |
| 1482 | r = !bio_list_empty(&pt->pool->retry_on_resume_list); |
| 1483 | spin_unlock_irqrestore(&pt->pool->lock, flags); |
| 1484 | |
| 1485 | if (!r) { |
| 1486 | struct request_queue *q = bdev_get_queue(pt->data_dev->bdev); |
| 1487 | r = bdi_congested(&q->backing_dev_info, bdi_bits); |
| 1488 | } |
| 1489 | |
| 1490 | return r; |
| 1491 | } |
| 1492 | |
| 1493 | static void __requeue_bios(struct pool *pool) |
| 1494 | { |
| 1495 | bio_list_merge(&pool->deferred_bios, &pool->retry_on_resume_list); |
| 1496 | bio_list_init(&pool->retry_on_resume_list); |
| 1497 | } |
| 1498 | |
| 1499 | /*---------------------------------------------------------------- |
| 1500 | * Binding of control targets to a pool object |
| 1501 | *--------------------------------------------------------------*/ |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1502 | static bool data_dev_supports_discard(struct pool_c *pt) |
| 1503 | { |
| 1504 | struct request_queue *q = bdev_get_queue(pt->data_dev->bdev); |
| 1505 | |
| 1506 | return q && blk_queue_discard(q); |
| 1507 | } |
| 1508 | |
| 1509 | /* |
| 1510 | * If discard_passdown was enabled verify that the data device |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1511 | * supports discards. Disable discard_passdown if not. |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1512 | */ |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1513 | static void disable_passdown_if_not_supported(struct pool_c *pt) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1514 | { |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1515 | struct pool *pool = pt->pool; |
| 1516 | struct block_device *data_bdev = pt->data_dev->bdev; |
| 1517 | struct queue_limits *data_limits = &bdev_get_queue(data_bdev)->limits; |
| 1518 | sector_t block_size = pool->sectors_per_block << SECTOR_SHIFT; |
| 1519 | const char *reason = NULL; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1520 | char buf[BDEVNAME_SIZE]; |
| 1521 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1522 | if (!pt->adjusted_pf.discard_passdown) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1523 | return; |
| 1524 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1525 | if (!data_dev_supports_discard(pt)) |
| 1526 | reason = "discard unsupported"; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1527 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1528 | else if (data_limits->max_discard_sectors < pool->sectors_per_block) |
| 1529 | reason = "max discard sectors smaller than a block"; |
| 1530 | |
| 1531 | else if (data_limits->discard_granularity > block_size) |
| 1532 | reason = "discard granularity larger than a block"; |
| 1533 | |
| 1534 | else if (block_size & (data_limits->discard_granularity - 1)) |
| 1535 | reason = "discard granularity not a factor of block size"; |
| 1536 | |
| 1537 | if (reason) { |
| 1538 | DMWARN("Data device (%s) %s: Disabling discard passdown.", bdevname(data_bdev, buf), reason); |
| 1539 | pt->adjusted_pf.discard_passdown = false; |
| 1540 | } |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1541 | } |
| 1542 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1543 | static int bind_control_target(struct pool *pool, struct dm_target *ti) |
| 1544 | { |
| 1545 | struct pool_c *pt = ti->private; |
| 1546 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1547 | /* |
| 1548 | * We want to make sure that degraded pools are never upgraded. |
| 1549 | */ |
| 1550 | enum pool_mode old_mode = pool->pf.mode; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1551 | enum pool_mode new_mode = pt->adjusted_pf.mode; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1552 | |
| 1553 | if (old_mode > new_mode) |
| 1554 | new_mode = old_mode; |
| 1555 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1556 | pool->ti = ti; |
| 1557 | pool->low_water_blocks = pt->low_water_blocks; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1558 | pool->pf = pt->adjusted_pf; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1559 | |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1560 | set_pool_mode(pool, new_mode); |
Mike Snitzer | f402693 | 2012-05-19 01:01:01 +0100 | [diff] [blame] | 1561 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1562 | return 0; |
| 1563 | } |
| 1564 | |
| 1565 | static void unbind_control_target(struct pool *pool, struct dm_target *ti) |
| 1566 | { |
| 1567 | if (pool->ti == ti) |
| 1568 | pool->ti = NULL; |
| 1569 | } |
| 1570 | |
| 1571 | /*---------------------------------------------------------------- |
| 1572 | * Pool creation |
| 1573 | *--------------------------------------------------------------*/ |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1574 | /* Initialize pool features. */ |
| 1575 | static void pool_features_init(struct pool_features *pf) |
| 1576 | { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1577 | pf->mode = PM_WRITE; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1578 | pf->zero_new_blocks = true; |
| 1579 | pf->discard_enabled = true; |
| 1580 | pf->discard_passdown = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1581 | } |
| 1582 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1583 | static void __pool_destroy(struct pool *pool) |
| 1584 | { |
| 1585 | __pool_table_remove(pool); |
| 1586 | |
| 1587 | if (dm_pool_metadata_close(pool->pmd) < 0) |
| 1588 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); |
| 1589 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1590 | dm_bio_prison_destroy(pool->prison); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1591 | dm_kcopyd_client_destroy(pool->copier); |
| 1592 | |
| 1593 | if (pool->wq) |
| 1594 | destroy_workqueue(pool->wq); |
| 1595 | |
| 1596 | if (pool->next_mapping) |
| 1597 | mempool_free(pool->next_mapping, pool->mapping_pool); |
| 1598 | mempool_destroy(pool->mapping_pool); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1599 | dm_deferred_set_destroy(pool->shared_read_ds); |
| 1600 | dm_deferred_set_destroy(pool->all_io_ds); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1601 | kfree(pool); |
| 1602 | } |
| 1603 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1604 | static struct kmem_cache *_new_mapping_cache; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1605 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1606 | static struct pool *pool_create(struct mapped_device *pool_md, |
| 1607 | struct block_device *metadata_dev, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1608 | unsigned long block_size, |
| 1609 | int read_only, char **error) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1610 | { |
| 1611 | int r; |
| 1612 | void *err_p; |
| 1613 | struct pool *pool; |
| 1614 | struct dm_pool_metadata *pmd; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1615 | bool format_device = read_only ? false : true; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1616 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1617 | pmd = dm_pool_metadata_open(metadata_dev, block_size, format_device); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1618 | if (IS_ERR(pmd)) { |
| 1619 | *error = "Error creating metadata object"; |
| 1620 | return (struct pool *)pmd; |
| 1621 | } |
| 1622 | |
| 1623 | pool = kmalloc(sizeof(*pool), GFP_KERNEL); |
| 1624 | if (!pool) { |
| 1625 | *error = "Error allocating memory for pool"; |
| 1626 | err_p = ERR_PTR(-ENOMEM); |
| 1627 | goto bad_pool; |
| 1628 | } |
| 1629 | |
| 1630 | pool->pmd = pmd; |
| 1631 | pool->sectors_per_block = block_size; |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 1632 | if (block_size & (block_size - 1)) |
| 1633 | pool->sectors_per_block_shift = -1; |
| 1634 | else |
| 1635 | pool->sectors_per_block_shift = __ffs(block_size); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1636 | pool->low_water_blocks = 0; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1637 | pool_features_init(&pool->pf); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1638 | pool->prison = dm_bio_prison_create(PRISON_CELLS); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1639 | if (!pool->prison) { |
| 1640 | *error = "Error creating pool's bio prison"; |
| 1641 | err_p = ERR_PTR(-ENOMEM); |
| 1642 | goto bad_prison; |
| 1643 | } |
| 1644 | |
| 1645 | pool->copier = dm_kcopyd_client_create(); |
| 1646 | if (IS_ERR(pool->copier)) { |
| 1647 | r = PTR_ERR(pool->copier); |
| 1648 | *error = "Error creating pool's kcopyd client"; |
| 1649 | err_p = ERR_PTR(r); |
| 1650 | goto bad_kcopyd_client; |
| 1651 | } |
| 1652 | |
| 1653 | /* |
| 1654 | * Create singlethreaded workqueue that will service all devices |
| 1655 | * that use this metadata. |
| 1656 | */ |
| 1657 | pool->wq = alloc_ordered_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM); |
| 1658 | if (!pool->wq) { |
| 1659 | *error = "Error creating pool's workqueue"; |
| 1660 | err_p = ERR_PTR(-ENOMEM); |
| 1661 | goto bad_wq; |
| 1662 | } |
| 1663 | |
| 1664 | INIT_WORK(&pool->worker, do_worker); |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1665 | INIT_DELAYED_WORK(&pool->waker, do_waker); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1666 | spin_lock_init(&pool->lock); |
| 1667 | bio_list_init(&pool->deferred_bios); |
| 1668 | bio_list_init(&pool->deferred_flush_bios); |
| 1669 | INIT_LIST_HEAD(&pool->prepared_mappings); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1670 | INIT_LIST_HEAD(&pool->prepared_discards); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1671 | pool->low_water_triggered = 0; |
| 1672 | pool->no_free_space = 0; |
| 1673 | bio_list_init(&pool->retry_on_resume_list); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1674 | |
| 1675 | pool->shared_read_ds = dm_deferred_set_create(); |
| 1676 | if (!pool->shared_read_ds) { |
| 1677 | *error = "Error creating pool's shared read deferred set"; |
| 1678 | err_p = ERR_PTR(-ENOMEM); |
| 1679 | goto bad_shared_read_ds; |
| 1680 | } |
| 1681 | |
| 1682 | pool->all_io_ds = dm_deferred_set_create(); |
| 1683 | if (!pool->all_io_ds) { |
| 1684 | *error = "Error creating pool's all io deferred set"; |
| 1685 | err_p = ERR_PTR(-ENOMEM); |
| 1686 | goto bad_all_io_ds; |
| 1687 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1688 | |
| 1689 | pool->next_mapping = NULL; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1690 | pool->mapping_pool = mempool_create_slab_pool(MAPPING_POOL_SIZE, |
| 1691 | _new_mapping_cache); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1692 | if (!pool->mapping_pool) { |
| 1693 | *error = "Error creating pool's mapping mempool"; |
| 1694 | err_p = ERR_PTR(-ENOMEM); |
| 1695 | goto bad_mapping_pool; |
| 1696 | } |
| 1697 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1698 | pool->ref_count = 1; |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1699 | pool->last_commit_jiffies = jiffies; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1700 | pool->pool_md = pool_md; |
| 1701 | pool->md_dev = metadata_dev; |
| 1702 | __pool_table_insert(pool); |
| 1703 | |
| 1704 | return pool; |
| 1705 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1706 | bad_mapping_pool: |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1707 | dm_deferred_set_destroy(pool->all_io_ds); |
| 1708 | bad_all_io_ds: |
| 1709 | dm_deferred_set_destroy(pool->shared_read_ds); |
| 1710 | bad_shared_read_ds: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1711 | destroy_workqueue(pool->wq); |
| 1712 | bad_wq: |
| 1713 | dm_kcopyd_client_destroy(pool->copier); |
| 1714 | bad_kcopyd_client: |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1715 | dm_bio_prison_destroy(pool->prison); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1716 | bad_prison: |
| 1717 | kfree(pool); |
| 1718 | bad_pool: |
| 1719 | if (dm_pool_metadata_close(pmd)) |
| 1720 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); |
| 1721 | |
| 1722 | return err_p; |
| 1723 | } |
| 1724 | |
| 1725 | static void __pool_inc(struct pool *pool) |
| 1726 | { |
| 1727 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 1728 | pool->ref_count++; |
| 1729 | } |
| 1730 | |
| 1731 | static void __pool_dec(struct pool *pool) |
| 1732 | { |
| 1733 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 1734 | BUG_ON(!pool->ref_count); |
| 1735 | if (!--pool->ref_count) |
| 1736 | __pool_destroy(pool); |
| 1737 | } |
| 1738 | |
| 1739 | static struct pool *__pool_find(struct mapped_device *pool_md, |
| 1740 | struct block_device *metadata_dev, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1741 | unsigned long block_size, int read_only, |
| 1742 | char **error, int *created) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1743 | { |
| 1744 | struct pool *pool = __pool_table_lookup_metadata_dev(metadata_dev); |
| 1745 | |
| 1746 | if (pool) { |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 1747 | if (pool->pool_md != pool_md) { |
| 1748 | *error = "metadata device already in use by a pool"; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1749 | return ERR_PTR(-EBUSY); |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 1750 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1751 | __pool_inc(pool); |
| 1752 | |
| 1753 | } else { |
| 1754 | pool = __pool_table_lookup(pool_md); |
| 1755 | if (pool) { |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 1756 | if (pool->md_dev != metadata_dev) { |
| 1757 | *error = "different pool cannot replace a pool"; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1758 | return ERR_PTR(-EINVAL); |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 1759 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1760 | __pool_inc(pool); |
| 1761 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1762 | } else { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1763 | pool = pool_create(pool_md, metadata_dev, block_size, read_only, error); |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1764 | *created = 1; |
| 1765 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1766 | } |
| 1767 | |
| 1768 | return pool; |
| 1769 | } |
| 1770 | |
| 1771 | /*---------------------------------------------------------------- |
| 1772 | * Pool target methods |
| 1773 | *--------------------------------------------------------------*/ |
| 1774 | static void pool_dtr(struct dm_target *ti) |
| 1775 | { |
| 1776 | struct pool_c *pt = ti->private; |
| 1777 | |
| 1778 | mutex_lock(&dm_thin_pool_table.mutex); |
| 1779 | |
| 1780 | unbind_control_target(pt->pool, ti); |
| 1781 | __pool_dec(pt->pool); |
| 1782 | dm_put_device(ti, pt->metadata_dev); |
| 1783 | dm_put_device(ti, pt->data_dev); |
| 1784 | kfree(pt); |
| 1785 | |
| 1786 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 1787 | } |
| 1788 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1789 | static int parse_pool_features(struct dm_arg_set *as, struct pool_features *pf, |
| 1790 | struct dm_target *ti) |
| 1791 | { |
| 1792 | int r; |
| 1793 | unsigned argc; |
| 1794 | const char *arg_name; |
| 1795 | |
| 1796 | static struct dm_arg _args[] = { |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1797 | {0, 3, "Invalid number of pool feature arguments"}, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1798 | }; |
| 1799 | |
| 1800 | /* |
| 1801 | * No feature arguments supplied. |
| 1802 | */ |
| 1803 | if (!as->argc) |
| 1804 | return 0; |
| 1805 | |
| 1806 | r = dm_read_arg_group(_args, as, &argc, &ti->error); |
| 1807 | if (r) |
| 1808 | return -EINVAL; |
| 1809 | |
| 1810 | while (argc && !r) { |
| 1811 | arg_name = dm_shift_arg(as); |
| 1812 | argc--; |
| 1813 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1814 | if (!strcasecmp(arg_name, "skip_block_zeroing")) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1815 | pf->zero_new_blocks = false; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1816 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1817 | else if (!strcasecmp(arg_name, "ignore_discard")) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1818 | pf->discard_enabled = false; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1819 | |
| 1820 | else if (!strcasecmp(arg_name, "no_discard_passdown")) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1821 | pf->discard_passdown = false; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1822 | |
| 1823 | else if (!strcasecmp(arg_name, "read_only")) |
| 1824 | pf->mode = PM_READ_ONLY; |
| 1825 | |
| 1826 | else { |
| 1827 | ti->error = "Unrecognised pool feature requested"; |
| 1828 | r = -EINVAL; |
| 1829 | break; |
| 1830 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1831 | } |
| 1832 | |
| 1833 | return r; |
| 1834 | } |
| 1835 | |
| 1836 | /* |
| 1837 | * thin-pool <metadata dev> <data dev> |
| 1838 | * <data block size (sectors)> |
| 1839 | * <low water mark (blocks)> |
| 1840 | * [<#feature args> [<arg>]*] |
| 1841 | * |
| 1842 | * Optional feature arguments are: |
| 1843 | * skip_block_zeroing: skips the zeroing of newly-provisioned blocks. |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1844 | * ignore_discard: disable discard |
| 1845 | * no_discard_passdown: don't pass discards down to the data device |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1846 | */ |
| 1847 | static int pool_ctr(struct dm_target *ti, unsigned argc, char **argv) |
| 1848 | { |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1849 | int r, pool_created = 0; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1850 | struct pool_c *pt; |
| 1851 | struct pool *pool; |
| 1852 | struct pool_features pf; |
| 1853 | struct dm_arg_set as; |
| 1854 | struct dm_dev *data_dev; |
| 1855 | unsigned long block_size; |
| 1856 | dm_block_t low_water_blocks; |
| 1857 | struct dm_dev *metadata_dev; |
| 1858 | sector_t metadata_dev_size; |
Mike Snitzer | c4a69ec | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1859 | char b[BDEVNAME_SIZE]; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1860 | |
| 1861 | /* |
| 1862 | * FIXME Remove validation from scope of lock. |
| 1863 | */ |
| 1864 | mutex_lock(&dm_thin_pool_table.mutex); |
| 1865 | |
| 1866 | if (argc < 4) { |
| 1867 | ti->error = "Invalid argument count"; |
| 1868 | r = -EINVAL; |
| 1869 | goto out_unlock; |
| 1870 | } |
| 1871 | as.argc = argc; |
| 1872 | as.argv = argv; |
| 1873 | |
| 1874 | r = dm_get_device(ti, argv[0], FMODE_READ | FMODE_WRITE, &metadata_dev); |
| 1875 | if (r) { |
| 1876 | ti->error = "Error opening metadata block device"; |
| 1877 | goto out_unlock; |
| 1878 | } |
| 1879 | |
| 1880 | 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] | 1881 | if (metadata_dev_size > THIN_METADATA_MAX_SECTORS_WARNING) |
| 1882 | DMWARN("Metadata device %s is larger than %u sectors: excess space will not be used.", |
| 1883 | bdevname(metadata_dev->bdev, b), THIN_METADATA_MAX_SECTORS); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1884 | |
| 1885 | r = dm_get_device(ti, argv[1], FMODE_READ | FMODE_WRITE, &data_dev); |
| 1886 | if (r) { |
| 1887 | ti->error = "Error getting data device"; |
| 1888 | goto out_metadata; |
| 1889 | } |
| 1890 | |
| 1891 | if (kstrtoul(argv[2], 10, &block_size) || !block_size || |
| 1892 | block_size < DATA_DEV_BLOCK_SIZE_MIN_SECTORS || |
| 1893 | block_size > DATA_DEV_BLOCK_SIZE_MAX_SECTORS || |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 1894 | block_size & (DATA_DEV_BLOCK_SIZE_MIN_SECTORS - 1)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1895 | ti->error = "Invalid block size"; |
| 1896 | r = -EINVAL; |
| 1897 | goto out; |
| 1898 | } |
| 1899 | |
| 1900 | if (kstrtoull(argv[3], 10, (unsigned long long *)&low_water_blocks)) { |
| 1901 | ti->error = "Invalid low water mark"; |
| 1902 | r = -EINVAL; |
| 1903 | goto out; |
| 1904 | } |
| 1905 | |
| 1906 | /* |
| 1907 | * Set default pool features. |
| 1908 | */ |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1909 | pool_features_init(&pf); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1910 | |
| 1911 | dm_consume_args(&as, 4); |
| 1912 | r = parse_pool_features(&as, &pf, ti); |
| 1913 | if (r) |
| 1914 | goto out; |
| 1915 | |
| 1916 | pt = kzalloc(sizeof(*pt), GFP_KERNEL); |
| 1917 | if (!pt) { |
| 1918 | r = -ENOMEM; |
| 1919 | goto out; |
| 1920 | } |
| 1921 | |
| 1922 | pool = __pool_find(dm_table_get_md(ti->table), metadata_dev->bdev, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1923 | block_size, pf.mode == PM_READ_ONLY, &ti->error, &pool_created); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1924 | if (IS_ERR(pool)) { |
| 1925 | r = PTR_ERR(pool); |
| 1926 | goto out_free_pt; |
| 1927 | } |
| 1928 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1929 | /* |
| 1930 | * 'pool_created' reflects whether this is the first table load. |
| 1931 | * Top level discard support is not allowed to be changed after |
| 1932 | * initial load. This would require a pool reload to trigger thin |
| 1933 | * device changes. |
| 1934 | */ |
| 1935 | if (!pool_created && pf.discard_enabled != pool->pf.discard_enabled) { |
| 1936 | ti->error = "Discard support cannot be disabled once enabled"; |
| 1937 | r = -EINVAL; |
| 1938 | goto out_flags_changed; |
| 1939 | } |
| 1940 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1941 | pt->pool = pool; |
| 1942 | pt->ti = ti; |
| 1943 | pt->metadata_dev = metadata_dev; |
| 1944 | pt->data_dev = data_dev; |
| 1945 | pt->low_water_blocks = low_water_blocks; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1946 | pt->adjusted_pf = pt->requested_pf = pf; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1947 | ti->num_flush_requests = 1; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1948 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1949 | /* |
| 1950 | * Only need to enable discards if the pool should pass |
| 1951 | * them down to the data device. The thin device's discard |
| 1952 | * processing will cause mappings to be removed from the btree. |
| 1953 | */ |
| 1954 | if (pf.discard_enabled && pf.discard_passdown) { |
| 1955 | ti->num_discard_requests = 1; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1956 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1957 | /* |
| 1958 | * Setting 'discards_supported' circumvents the normal |
| 1959 | * stacking of discard limits (this keeps the pool and |
| 1960 | * thin devices' discard limits consistent). |
| 1961 | */ |
Alasdair G Kergon | 0ac5548 | 2012-07-27 15:08:08 +0100 | [diff] [blame] | 1962 | ti->discards_supported = true; |
Mike Snitzer | 307615a | 2012-09-26 23:45:39 +0100 | [diff] [blame] | 1963 | ti->discard_zeroes_data_unsupported = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1964 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1965 | ti->private = pt; |
| 1966 | |
| 1967 | pt->callbacks.congested_fn = pool_is_congested; |
| 1968 | dm_table_add_target_callbacks(ti->table, &pt->callbacks); |
| 1969 | |
| 1970 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 1971 | |
| 1972 | return 0; |
| 1973 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1974 | out_flags_changed: |
| 1975 | __pool_dec(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1976 | out_free_pt: |
| 1977 | kfree(pt); |
| 1978 | out: |
| 1979 | dm_put_device(ti, data_dev); |
| 1980 | out_metadata: |
| 1981 | dm_put_device(ti, metadata_dev); |
| 1982 | out_unlock: |
| 1983 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 1984 | |
| 1985 | return r; |
| 1986 | } |
| 1987 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 1988 | static int pool_map(struct dm_target *ti, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1989 | { |
| 1990 | int r; |
| 1991 | struct pool_c *pt = ti->private; |
| 1992 | struct pool *pool = pt->pool; |
| 1993 | unsigned long flags; |
| 1994 | |
| 1995 | /* |
| 1996 | * As this is a singleton target, ti->begin is always zero. |
| 1997 | */ |
| 1998 | spin_lock_irqsave(&pool->lock, flags); |
| 1999 | bio->bi_bdev = pt->data_dev->bdev; |
| 2000 | r = DM_MAPIO_REMAPPED; |
| 2001 | spin_unlock_irqrestore(&pool->lock, flags); |
| 2002 | |
| 2003 | return r; |
| 2004 | } |
| 2005 | |
| 2006 | /* |
| 2007 | * Retrieves the number of blocks of the data device from |
| 2008 | * the superblock and compares it to the actual device size, |
| 2009 | * thus resizing the data device in case it has grown. |
| 2010 | * |
| 2011 | * This both copes with opening preallocated data devices in the ctr |
| 2012 | * being followed by a resume |
| 2013 | * -and- |
| 2014 | * calling the resume method individually after userspace has |
| 2015 | * grown the data device in reaction to a table event. |
| 2016 | */ |
| 2017 | static int pool_preresume(struct dm_target *ti) |
| 2018 | { |
| 2019 | int r; |
| 2020 | struct pool_c *pt = ti->private; |
| 2021 | struct pool *pool = pt->pool; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2022 | sector_t data_size = ti->len; |
| 2023 | dm_block_t sb_data_size; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2024 | |
| 2025 | /* |
| 2026 | * Take control of the pool object. |
| 2027 | */ |
| 2028 | r = bind_control_target(pool, ti); |
| 2029 | if (r) |
| 2030 | return r; |
| 2031 | |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2032 | (void) sector_div(data_size, pool->sectors_per_block); |
| 2033 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2034 | r = dm_pool_get_data_dev_size(pool->pmd, &sb_data_size); |
| 2035 | if (r) { |
| 2036 | DMERR("failed to retrieve data device size"); |
| 2037 | return r; |
| 2038 | } |
| 2039 | |
| 2040 | if (data_size < sb_data_size) { |
| 2041 | DMERR("pool target too small, is %llu blocks (expected %llu)", |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2042 | (unsigned long long)data_size, sb_data_size); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2043 | return -EINVAL; |
| 2044 | |
| 2045 | } else if (data_size > sb_data_size) { |
| 2046 | r = dm_pool_resize_data_dev(pool->pmd, data_size); |
| 2047 | if (r) { |
| 2048 | DMERR("failed to resize data device"); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2049 | /* FIXME Stricter than necessary: Rollback transaction instead here */ |
| 2050 | set_pool_mode(pool, PM_READ_ONLY); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2051 | return r; |
| 2052 | } |
| 2053 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2054 | (void) commit_or_fallback(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2055 | } |
| 2056 | |
| 2057 | return 0; |
| 2058 | } |
| 2059 | |
| 2060 | static void pool_resume(struct dm_target *ti) |
| 2061 | { |
| 2062 | struct pool_c *pt = ti->private; |
| 2063 | struct pool *pool = pt->pool; |
| 2064 | unsigned long flags; |
| 2065 | |
| 2066 | spin_lock_irqsave(&pool->lock, flags); |
| 2067 | pool->low_water_triggered = 0; |
| 2068 | pool->no_free_space = 0; |
| 2069 | __requeue_bios(pool); |
| 2070 | spin_unlock_irqrestore(&pool->lock, flags); |
| 2071 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 2072 | do_waker(&pool->waker.work); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2073 | } |
| 2074 | |
| 2075 | static void pool_postsuspend(struct dm_target *ti) |
| 2076 | { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2077 | struct pool_c *pt = ti->private; |
| 2078 | struct pool *pool = pt->pool; |
| 2079 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 2080 | cancel_delayed_work(&pool->waker); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2081 | flush_workqueue(pool->wq); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2082 | (void) commit_or_fallback(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2083 | } |
| 2084 | |
| 2085 | static int check_arg_count(unsigned argc, unsigned args_required) |
| 2086 | { |
| 2087 | if (argc != args_required) { |
| 2088 | DMWARN("Message received with %u arguments instead of %u.", |
| 2089 | argc, args_required); |
| 2090 | return -EINVAL; |
| 2091 | } |
| 2092 | |
| 2093 | return 0; |
| 2094 | } |
| 2095 | |
| 2096 | static int read_dev_id(char *arg, dm_thin_id *dev_id, int warning) |
| 2097 | { |
| 2098 | if (!kstrtoull(arg, 10, (unsigned long long *)dev_id) && |
| 2099 | *dev_id <= MAX_DEV_ID) |
| 2100 | return 0; |
| 2101 | |
| 2102 | if (warning) |
| 2103 | DMWARN("Message received with invalid device id: %s", arg); |
| 2104 | |
| 2105 | return -EINVAL; |
| 2106 | } |
| 2107 | |
| 2108 | static int process_create_thin_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2109 | { |
| 2110 | dm_thin_id dev_id; |
| 2111 | int r; |
| 2112 | |
| 2113 | r = check_arg_count(argc, 2); |
| 2114 | if (r) |
| 2115 | return r; |
| 2116 | |
| 2117 | r = read_dev_id(argv[1], &dev_id, 1); |
| 2118 | if (r) |
| 2119 | return r; |
| 2120 | |
| 2121 | r = dm_pool_create_thin(pool->pmd, dev_id); |
| 2122 | if (r) { |
| 2123 | DMWARN("Creation of new thinly-provisioned device with id %s failed.", |
| 2124 | argv[1]); |
| 2125 | return r; |
| 2126 | } |
| 2127 | |
| 2128 | return 0; |
| 2129 | } |
| 2130 | |
| 2131 | static int process_create_snap_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2132 | { |
| 2133 | dm_thin_id dev_id; |
| 2134 | dm_thin_id origin_dev_id; |
| 2135 | int r; |
| 2136 | |
| 2137 | r = check_arg_count(argc, 3); |
| 2138 | if (r) |
| 2139 | return r; |
| 2140 | |
| 2141 | r = read_dev_id(argv[1], &dev_id, 1); |
| 2142 | if (r) |
| 2143 | return r; |
| 2144 | |
| 2145 | r = read_dev_id(argv[2], &origin_dev_id, 1); |
| 2146 | if (r) |
| 2147 | return r; |
| 2148 | |
| 2149 | r = dm_pool_create_snap(pool->pmd, dev_id, origin_dev_id); |
| 2150 | if (r) { |
| 2151 | DMWARN("Creation of new snapshot %s of device %s failed.", |
| 2152 | argv[1], argv[2]); |
| 2153 | return r; |
| 2154 | } |
| 2155 | |
| 2156 | return 0; |
| 2157 | } |
| 2158 | |
| 2159 | static int process_delete_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2160 | { |
| 2161 | dm_thin_id dev_id; |
| 2162 | int r; |
| 2163 | |
| 2164 | r = check_arg_count(argc, 2); |
| 2165 | if (r) |
| 2166 | return r; |
| 2167 | |
| 2168 | r = read_dev_id(argv[1], &dev_id, 1); |
| 2169 | if (r) |
| 2170 | return r; |
| 2171 | |
| 2172 | r = dm_pool_delete_thin_device(pool->pmd, dev_id); |
| 2173 | if (r) |
| 2174 | DMWARN("Deletion of thin device %s failed.", argv[1]); |
| 2175 | |
| 2176 | return r; |
| 2177 | } |
| 2178 | |
| 2179 | static int process_set_transaction_id_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2180 | { |
| 2181 | dm_thin_id old_id, new_id; |
| 2182 | int r; |
| 2183 | |
| 2184 | r = check_arg_count(argc, 3); |
| 2185 | if (r) |
| 2186 | return r; |
| 2187 | |
| 2188 | if (kstrtoull(argv[1], 10, (unsigned long long *)&old_id)) { |
| 2189 | DMWARN("set_transaction_id message: Unrecognised id %s.", argv[1]); |
| 2190 | return -EINVAL; |
| 2191 | } |
| 2192 | |
| 2193 | if (kstrtoull(argv[2], 10, (unsigned long long *)&new_id)) { |
| 2194 | DMWARN("set_transaction_id message: Unrecognised new id %s.", argv[2]); |
| 2195 | return -EINVAL; |
| 2196 | } |
| 2197 | |
| 2198 | r = dm_pool_set_metadata_transaction_id(pool->pmd, old_id, new_id); |
| 2199 | if (r) { |
| 2200 | DMWARN("Failed to change transaction id from %s to %s.", |
| 2201 | argv[1], argv[2]); |
| 2202 | return r; |
| 2203 | } |
| 2204 | |
| 2205 | return 0; |
| 2206 | } |
| 2207 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2208 | static int process_reserve_metadata_snap_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2209 | { |
| 2210 | int r; |
| 2211 | |
| 2212 | r = check_arg_count(argc, 1); |
| 2213 | if (r) |
| 2214 | return r; |
| 2215 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2216 | (void) commit_or_fallback(pool); |
Joe Thornber | 0d200ae | 2012-07-03 12:55:31 +0100 | [diff] [blame] | 2217 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2218 | r = dm_pool_reserve_metadata_snap(pool->pmd); |
| 2219 | if (r) |
| 2220 | DMWARN("reserve_metadata_snap message failed."); |
| 2221 | |
| 2222 | return r; |
| 2223 | } |
| 2224 | |
| 2225 | static int process_release_metadata_snap_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2226 | { |
| 2227 | int r; |
| 2228 | |
| 2229 | r = check_arg_count(argc, 1); |
| 2230 | if (r) |
| 2231 | return r; |
| 2232 | |
| 2233 | r = dm_pool_release_metadata_snap(pool->pmd); |
| 2234 | if (r) |
| 2235 | DMWARN("release_metadata_snap message failed."); |
| 2236 | |
| 2237 | return r; |
| 2238 | } |
| 2239 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2240 | /* |
| 2241 | * Messages supported: |
| 2242 | * create_thin <dev_id> |
| 2243 | * create_snap <dev_id> <origin_id> |
| 2244 | * delete <dev_id> |
| 2245 | * trim <dev_id> <new_size_in_sectors> |
| 2246 | * set_transaction_id <current_trans_id> <new_trans_id> |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2247 | * reserve_metadata_snap |
| 2248 | * release_metadata_snap |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2249 | */ |
| 2250 | static int pool_message(struct dm_target *ti, unsigned argc, char **argv) |
| 2251 | { |
| 2252 | int r = -EINVAL; |
| 2253 | struct pool_c *pt = ti->private; |
| 2254 | struct pool *pool = pt->pool; |
| 2255 | |
| 2256 | if (!strcasecmp(argv[0], "create_thin")) |
| 2257 | r = process_create_thin_mesg(argc, argv, pool); |
| 2258 | |
| 2259 | else if (!strcasecmp(argv[0], "create_snap")) |
| 2260 | r = process_create_snap_mesg(argc, argv, pool); |
| 2261 | |
| 2262 | else if (!strcasecmp(argv[0], "delete")) |
| 2263 | r = process_delete_mesg(argc, argv, pool); |
| 2264 | |
| 2265 | else if (!strcasecmp(argv[0], "set_transaction_id")) |
| 2266 | r = process_set_transaction_id_mesg(argc, argv, pool); |
| 2267 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2268 | else if (!strcasecmp(argv[0], "reserve_metadata_snap")) |
| 2269 | r = process_reserve_metadata_snap_mesg(argc, argv, pool); |
| 2270 | |
| 2271 | else if (!strcasecmp(argv[0], "release_metadata_snap")) |
| 2272 | r = process_release_metadata_snap_mesg(argc, argv, pool); |
| 2273 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2274 | else |
| 2275 | DMWARN("Unrecognised thin pool target message received: %s", argv[0]); |
| 2276 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2277 | if (!r) |
| 2278 | (void) commit_or_fallback(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2279 | |
| 2280 | return r; |
| 2281 | } |
| 2282 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2283 | static void emit_flags(struct pool_features *pf, char *result, |
| 2284 | unsigned sz, unsigned maxlen) |
| 2285 | { |
| 2286 | unsigned count = !pf->zero_new_blocks + !pf->discard_enabled + |
| 2287 | !pf->discard_passdown + (pf->mode == PM_READ_ONLY); |
| 2288 | DMEMIT("%u ", count); |
| 2289 | |
| 2290 | if (!pf->zero_new_blocks) |
| 2291 | DMEMIT("skip_block_zeroing "); |
| 2292 | |
| 2293 | if (!pf->discard_enabled) |
| 2294 | DMEMIT("ignore_discard "); |
| 2295 | |
| 2296 | if (!pf->discard_passdown) |
| 2297 | DMEMIT("no_discard_passdown "); |
| 2298 | |
| 2299 | if (pf->mode == PM_READ_ONLY) |
| 2300 | DMEMIT("read_only "); |
| 2301 | } |
| 2302 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2303 | /* |
| 2304 | * Status line is: |
| 2305 | * <transaction id> <used metadata sectors>/<total metadata sectors> |
| 2306 | * <used data sectors>/<total data sectors> <held metadata root> |
| 2307 | */ |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2308 | static void pool_status(struct dm_target *ti, status_type_t type, |
| 2309 | unsigned status_flags, char *result, unsigned maxlen) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2310 | { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2311 | int r; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2312 | unsigned sz = 0; |
| 2313 | uint64_t transaction_id; |
| 2314 | dm_block_t nr_free_blocks_data; |
| 2315 | dm_block_t nr_free_blocks_metadata; |
| 2316 | dm_block_t nr_blocks_data; |
| 2317 | dm_block_t nr_blocks_metadata; |
| 2318 | dm_block_t held_root; |
| 2319 | char buf[BDEVNAME_SIZE]; |
| 2320 | char buf2[BDEVNAME_SIZE]; |
| 2321 | struct pool_c *pt = ti->private; |
| 2322 | struct pool *pool = pt->pool; |
| 2323 | |
| 2324 | switch (type) { |
| 2325 | case STATUSTYPE_INFO: |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2326 | if (get_pool_mode(pool) == PM_FAIL) { |
| 2327 | DMEMIT("Fail"); |
| 2328 | break; |
| 2329 | } |
| 2330 | |
Alasdair G Kergon | 1f4e0ff | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2331 | /* Commit to ensure statistics aren't out-of-date */ |
| 2332 | if (!(status_flags & DM_STATUS_NOFLUSH_FLAG) && !dm_suspended(ti)) |
| 2333 | (void) commit_or_fallback(pool); |
| 2334 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2335 | r = dm_pool_get_metadata_transaction_id(pool->pmd, &transaction_id); |
| 2336 | if (r) { |
| 2337 | DMERR("dm_pool_get_metadata_transaction_id returned %d", r); |
| 2338 | goto err; |
| 2339 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2340 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2341 | r = dm_pool_get_free_metadata_block_count(pool->pmd, &nr_free_blocks_metadata); |
| 2342 | if (r) { |
| 2343 | DMERR("dm_pool_get_free_metadata_block_count returned %d", r); |
| 2344 | goto err; |
| 2345 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2346 | |
| 2347 | r = dm_pool_get_metadata_dev_size(pool->pmd, &nr_blocks_metadata); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2348 | if (r) { |
| 2349 | DMERR("dm_pool_get_metadata_dev_size returned %d", r); |
| 2350 | goto err; |
| 2351 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2352 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2353 | r = dm_pool_get_free_block_count(pool->pmd, &nr_free_blocks_data); |
| 2354 | if (r) { |
| 2355 | DMERR("dm_pool_get_free_block_count returned %d", r); |
| 2356 | goto err; |
| 2357 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2358 | |
| 2359 | r = dm_pool_get_data_dev_size(pool->pmd, &nr_blocks_data); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2360 | if (r) { |
| 2361 | DMERR("dm_pool_get_data_dev_size returned %d", r); |
| 2362 | goto err; |
| 2363 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2364 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2365 | r = dm_pool_get_metadata_snap(pool->pmd, &held_root); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2366 | if (r) { |
| 2367 | DMERR("dm_pool_get_metadata_snap returned %d", r); |
| 2368 | goto err; |
| 2369 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2370 | |
| 2371 | DMEMIT("%llu %llu/%llu %llu/%llu ", |
| 2372 | (unsigned long long)transaction_id, |
| 2373 | (unsigned long long)(nr_blocks_metadata - nr_free_blocks_metadata), |
| 2374 | (unsigned long long)nr_blocks_metadata, |
| 2375 | (unsigned long long)(nr_blocks_data - nr_free_blocks_data), |
| 2376 | (unsigned long long)nr_blocks_data); |
| 2377 | |
| 2378 | if (held_root) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2379 | DMEMIT("%llu ", held_root); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2380 | else |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2381 | DMEMIT("- "); |
| 2382 | |
| 2383 | if (pool->pf.mode == PM_READ_ONLY) |
| 2384 | DMEMIT("ro "); |
| 2385 | else |
| 2386 | DMEMIT("rw "); |
| 2387 | |
Mike Snitzer | 018debe | 2012-12-21 20:23:32 +0000 | [diff] [blame] | 2388 | if (!pool->pf.discard_enabled) |
| 2389 | DMEMIT("ignore_discard"); |
| 2390 | else if (pool->pf.discard_passdown) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2391 | DMEMIT("discard_passdown"); |
| 2392 | else |
| 2393 | DMEMIT("no_discard_passdown"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2394 | |
| 2395 | break; |
| 2396 | |
| 2397 | case STATUSTYPE_TABLE: |
| 2398 | DMEMIT("%s %s %lu %llu ", |
| 2399 | format_dev_t(buf, pt->metadata_dev->bdev->bd_dev), |
| 2400 | format_dev_t(buf2, pt->data_dev->bdev->bd_dev), |
| 2401 | (unsigned long)pool->sectors_per_block, |
| 2402 | (unsigned long long)pt->low_water_blocks); |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2403 | emit_flags(&pt->requested_pf, result, sz, maxlen); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2404 | break; |
| 2405 | } |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2406 | return; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2407 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2408 | err: |
| 2409 | DMEMIT("Error"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2410 | } |
| 2411 | |
| 2412 | static int pool_iterate_devices(struct dm_target *ti, |
| 2413 | iterate_devices_callout_fn fn, void *data) |
| 2414 | { |
| 2415 | struct pool_c *pt = ti->private; |
| 2416 | |
| 2417 | return fn(ti, pt->data_dev, 0, ti->len, data); |
| 2418 | } |
| 2419 | |
| 2420 | static int pool_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
| 2421 | struct bio_vec *biovec, int max_size) |
| 2422 | { |
| 2423 | struct pool_c *pt = ti->private; |
| 2424 | struct request_queue *q = bdev_get_queue(pt->data_dev->bdev); |
| 2425 | |
| 2426 | if (!q->merge_bvec_fn) |
| 2427 | return max_size; |
| 2428 | |
| 2429 | bvm->bi_bdev = pt->data_dev->bdev; |
| 2430 | |
| 2431 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); |
| 2432 | } |
| 2433 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2434 | 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] | 2435 | { |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2436 | struct pool *pool = pt->pool; |
| 2437 | struct queue_limits *data_limits; |
| 2438 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2439 | limits->max_discard_sectors = pool->sectors_per_block; |
| 2440 | |
| 2441 | /* |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2442 | * discard_granularity is just a hint, and not enforced. |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2443 | */ |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2444 | if (pt->adjusted_pf.discard_passdown) { |
| 2445 | data_limits = &bdev_get_queue(pt->data_dev->bdev)->limits; |
| 2446 | limits->discard_granularity = data_limits->discard_granularity; |
Mike Snitzer | f13945d | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2447 | } else |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2448 | limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2449 | } |
| 2450 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2451 | static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits) |
| 2452 | { |
| 2453 | struct pool_c *pt = ti->private; |
| 2454 | struct pool *pool = pt->pool; |
| 2455 | |
| 2456 | blk_limits_io_min(limits, 0); |
| 2457 | blk_limits_io_opt(limits, pool->sectors_per_block << SECTOR_SHIFT); |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2458 | |
| 2459 | /* |
| 2460 | * pt->adjusted_pf is a staging area for the actual features to use. |
| 2461 | * They get transferred to the live pool in bind_control_target() |
| 2462 | * called from pool_preresume(). |
| 2463 | */ |
| 2464 | if (!pt->adjusted_pf.discard_enabled) |
| 2465 | return; |
| 2466 | |
| 2467 | disable_passdown_if_not_supported(pt); |
| 2468 | |
| 2469 | set_discard_limits(pt, limits); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2470 | } |
| 2471 | |
| 2472 | static struct target_type pool_target = { |
| 2473 | .name = "thin-pool", |
| 2474 | .features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE | |
| 2475 | DM_TARGET_IMMUTABLE, |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2476 | .version = {1, 6, 1}, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2477 | .module = THIS_MODULE, |
| 2478 | .ctr = pool_ctr, |
| 2479 | .dtr = pool_dtr, |
| 2480 | .map = pool_map, |
| 2481 | .postsuspend = pool_postsuspend, |
| 2482 | .preresume = pool_preresume, |
| 2483 | .resume = pool_resume, |
| 2484 | .message = pool_message, |
| 2485 | .status = pool_status, |
| 2486 | .merge = pool_merge, |
| 2487 | .iterate_devices = pool_iterate_devices, |
| 2488 | .io_hints = pool_io_hints, |
| 2489 | }; |
| 2490 | |
| 2491 | /*---------------------------------------------------------------- |
| 2492 | * Thin target methods |
| 2493 | *--------------------------------------------------------------*/ |
| 2494 | static void thin_dtr(struct dm_target *ti) |
| 2495 | { |
| 2496 | struct thin_c *tc = ti->private; |
| 2497 | |
| 2498 | mutex_lock(&dm_thin_pool_table.mutex); |
| 2499 | |
| 2500 | __pool_dec(tc->pool); |
| 2501 | dm_pool_close_thin_device(tc->td); |
| 2502 | dm_put_device(ti, tc->pool_dev); |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2503 | if (tc->origin_dev) |
| 2504 | dm_put_device(ti, tc->origin_dev); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2505 | kfree(tc); |
| 2506 | |
| 2507 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2508 | } |
| 2509 | |
| 2510 | /* |
| 2511 | * Thin target parameters: |
| 2512 | * |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2513 | * <pool_dev> <dev_id> [origin_dev] |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2514 | * |
| 2515 | * pool_dev: the path to the pool (eg, /dev/mapper/my_pool) |
| 2516 | * dev_id: the internal device identifier |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2517 | * 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] | 2518 | * |
| 2519 | * If the pool device has discards disabled, they get disabled for the thin |
| 2520 | * device as well. |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2521 | */ |
| 2522 | static int thin_ctr(struct dm_target *ti, unsigned argc, char **argv) |
| 2523 | { |
| 2524 | int r; |
| 2525 | struct thin_c *tc; |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2526 | struct dm_dev *pool_dev, *origin_dev; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2527 | struct mapped_device *pool_md; |
| 2528 | |
| 2529 | mutex_lock(&dm_thin_pool_table.mutex); |
| 2530 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2531 | if (argc != 2 && argc != 3) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2532 | ti->error = "Invalid argument count"; |
| 2533 | r = -EINVAL; |
| 2534 | goto out_unlock; |
| 2535 | } |
| 2536 | |
| 2537 | tc = ti->private = kzalloc(sizeof(*tc), GFP_KERNEL); |
| 2538 | if (!tc) { |
| 2539 | ti->error = "Out of memory"; |
| 2540 | r = -ENOMEM; |
| 2541 | goto out_unlock; |
| 2542 | } |
| 2543 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2544 | if (argc == 3) { |
| 2545 | r = dm_get_device(ti, argv[2], FMODE_READ, &origin_dev); |
| 2546 | if (r) { |
| 2547 | ti->error = "Error opening origin device"; |
| 2548 | goto bad_origin_dev; |
| 2549 | } |
| 2550 | tc->origin_dev = origin_dev; |
| 2551 | } |
| 2552 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2553 | r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &pool_dev); |
| 2554 | if (r) { |
| 2555 | ti->error = "Error opening pool device"; |
| 2556 | goto bad_pool_dev; |
| 2557 | } |
| 2558 | tc->pool_dev = pool_dev; |
| 2559 | |
| 2560 | if (read_dev_id(argv[1], (unsigned long long *)&tc->dev_id, 0)) { |
| 2561 | ti->error = "Invalid device id"; |
| 2562 | r = -EINVAL; |
| 2563 | goto bad_common; |
| 2564 | } |
| 2565 | |
| 2566 | pool_md = dm_get_md(tc->pool_dev->bdev->bd_dev); |
| 2567 | if (!pool_md) { |
| 2568 | ti->error = "Couldn't get pool mapped device"; |
| 2569 | r = -EINVAL; |
| 2570 | goto bad_common; |
| 2571 | } |
| 2572 | |
| 2573 | tc->pool = __pool_table_lookup(pool_md); |
| 2574 | if (!tc->pool) { |
| 2575 | ti->error = "Couldn't find pool object"; |
| 2576 | r = -EINVAL; |
| 2577 | goto bad_pool_lookup; |
| 2578 | } |
| 2579 | __pool_inc(tc->pool); |
| 2580 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2581 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
| 2582 | ti->error = "Couldn't open thin device, Pool is in fail mode"; |
| 2583 | goto bad_thin_open; |
| 2584 | } |
| 2585 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2586 | r = dm_pool_open_thin_device(tc->pool->pmd, tc->dev_id, &tc->td); |
| 2587 | if (r) { |
| 2588 | ti->error = "Couldn't open thin internal device"; |
| 2589 | goto bad_thin_open; |
| 2590 | } |
| 2591 | |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 2592 | r = dm_set_target_max_io_len(ti, tc->pool->sectors_per_block); |
| 2593 | if (r) |
| 2594 | goto bad_thin_open; |
| 2595 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2596 | ti->num_flush_requests = 1; |
Joe Thornber | 16ad3d1 | 2012-07-27 15:08:07 +0100 | [diff] [blame] | 2597 | ti->flush_supported = true; |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 2598 | ti->per_bio_data_size = sizeof(struct dm_thin_endio_hook); |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2599 | |
| 2600 | /* In case the pool supports discards, pass them on. */ |
| 2601 | if (tc->pool->pf.discard_enabled) { |
Alasdair G Kergon | 0ac5548 | 2012-07-27 15:08:08 +0100 | [diff] [blame] | 2602 | ti->discards_supported = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2603 | ti->num_discard_requests = 1; |
Alasdair G Kergon | 0ac5548 | 2012-07-27 15:08:08 +0100 | [diff] [blame] | 2604 | ti->discard_zeroes_data_unsupported = true; |
Mikulas Patocka | 4929630 | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 2605 | /* Discard requests must be split on a block boundary */ |
Alasdair G Kergon | 0ac5548 | 2012-07-27 15:08:08 +0100 | [diff] [blame] | 2606 | ti->split_discard_requests = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2607 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2608 | |
| 2609 | dm_put(pool_md); |
| 2610 | |
| 2611 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2612 | |
| 2613 | return 0; |
| 2614 | |
| 2615 | bad_thin_open: |
| 2616 | __pool_dec(tc->pool); |
| 2617 | bad_pool_lookup: |
| 2618 | dm_put(pool_md); |
| 2619 | bad_common: |
| 2620 | dm_put_device(ti, tc->pool_dev); |
| 2621 | bad_pool_dev: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2622 | if (tc->origin_dev) |
| 2623 | dm_put_device(ti, tc->origin_dev); |
| 2624 | bad_origin_dev: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2625 | kfree(tc); |
| 2626 | out_unlock: |
| 2627 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2628 | |
| 2629 | return r; |
| 2630 | } |
| 2631 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 2632 | static int thin_map(struct dm_target *ti, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2633 | { |
Alasdair G Kergon | 6efd6e8 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2634 | bio->bi_sector = dm_target_offset(ti, bio->bi_sector); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2635 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 2636 | return thin_bio_map(ti, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2637 | } |
| 2638 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 2639 | 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] | 2640 | { |
| 2641 | unsigned long flags; |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 2642 | 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] | 2643 | struct list_head work; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2644 | struct dm_thin_new_mapping *m, *tmp; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2645 | struct pool *pool = h->tc->pool; |
| 2646 | |
| 2647 | if (h->shared_read_entry) { |
| 2648 | INIT_LIST_HEAD(&work); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 2649 | dm_deferred_entry_dec(h->shared_read_entry, &work); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2650 | |
| 2651 | spin_lock_irqsave(&pool->lock, flags); |
| 2652 | list_for_each_entry_safe(m, tmp, &work, list) { |
| 2653 | list_del(&m->list); |
| 2654 | m->quiesced = 1; |
| 2655 | __maybe_add_mapping(m); |
| 2656 | } |
| 2657 | spin_unlock_irqrestore(&pool->lock, flags); |
| 2658 | } |
| 2659 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2660 | if (h->all_io_entry) { |
| 2661 | INIT_LIST_HEAD(&work); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 2662 | dm_deferred_entry_dec(h->all_io_entry, &work); |
Joe Thornber | 563af18 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 2663 | if (!list_empty(&work)) { |
| 2664 | spin_lock_irqsave(&pool->lock, flags); |
| 2665 | list_for_each_entry_safe(m, tmp, &work, list) |
| 2666 | list_add(&m->list, &pool->prepared_discards); |
| 2667 | spin_unlock_irqrestore(&pool->lock, flags); |
| 2668 | wake_worker(pool); |
| 2669 | } |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2670 | } |
| 2671 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2672 | return 0; |
| 2673 | } |
| 2674 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2675 | static void thin_postsuspend(struct dm_target *ti) |
| 2676 | { |
| 2677 | if (dm_noflush_suspending(ti)) |
| 2678 | requeue_io((struct thin_c *)ti->private); |
| 2679 | } |
| 2680 | |
| 2681 | /* |
| 2682 | * <nr mapped sectors> <highest mapped sector> |
| 2683 | */ |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2684 | static void thin_status(struct dm_target *ti, status_type_t type, |
| 2685 | unsigned status_flags, char *result, unsigned maxlen) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2686 | { |
| 2687 | int r; |
| 2688 | ssize_t sz = 0; |
| 2689 | dm_block_t mapped, highest; |
| 2690 | char buf[BDEVNAME_SIZE]; |
| 2691 | struct thin_c *tc = ti->private; |
| 2692 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2693 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
| 2694 | DMEMIT("Fail"); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2695 | return; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2696 | } |
| 2697 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2698 | if (!tc->td) |
| 2699 | DMEMIT("-"); |
| 2700 | else { |
| 2701 | switch (type) { |
| 2702 | case STATUSTYPE_INFO: |
| 2703 | r = dm_thin_get_mapped_count(tc->td, &mapped); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2704 | if (r) { |
| 2705 | DMERR("dm_thin_get_mapped_count returned %d", r); |
| 2706 | goto err; |
| 2707 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2708 | |
| 2709 | r = dm_thin_get_highest_mapped_block(tc->td, &highest); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2710 | if (r < 0) { |
| 2711 | DMERR("dm_thin_get_highest_mapped_block returned %d", r); |
| 2712 | goto err; |
| 2713 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2714 | |
| 2715 | DMEMIT("%llu ", mapped * tc->pool->sectors_per_block); |
| 2716 | if (r) |
| 2717 | DMEMIT("%llu", ((highest + 1) * |
| 2718 | tc->pool->sectors_per_block) - 1); |
| 2719 | else |
| 2720 | DMEMIT("-"); |
| 2721 | break; |
| 2722 | |
| 2723 | case STATUSTYPE_TABLE: |
| 2724 | DMEMIT("%s %lu", |
| 2725 | format_dev_t(buf, tc->pool_dev->bdev->bd_dev), |
| 2726 | (unsigned long) tc->dev_id); |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2727 | if (tc->origin_dev) |
| 2728 | DMEMIT(" %s", format_dev_t(buf, tc->origin_dev->bdev->bd_dev)); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2729 | break; |
| 2730 | } |
| 2731 | } |
| 2732 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2733 | return; |
| 2734 | |
| 2735 | err: |
| 2736 | DMEMIT("Error"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2737 | } |
| 2738 | |
| 2739 | static int thin_iterate_devices(struct dm_target *ti, |
| 2740 | iterate_devices_callout_fn fn, void *data) |
| 2741 | { |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2742 | sector_t blocks; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2743 | struct thin_c *tc = ti->private; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2744 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2745 | |
| 2746 | /* |
| 2747 | * We can't call dm_pool_get_data_dev_size() since that blocks. So |
| 2748 | * we follow a more convoluted path through to the pool's target. |
| 2749 | */ |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2750 | if (!pool->ti) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2751 | return 0; /* nothing is bound */ |
| 2752 | |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2753 | blocks = pool->ti->len; |
| 2754 | (void) sector_div(blocks, pool->sectors_per_block); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2755 | if (blocks) |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2756 | 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] | 2757 | |
| 2758 | return 0; |
| 2759 | } |
| 2760 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2761 | static struct target_type thin_target = { |
| 2762 | .name = "thin", |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2763 | .version = {1, 7, 1}, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2764 | .module = THIS_MODULE, |
| 2765 | .ctr = thin_ctr, |
| 2766 | .dtr = thin_dtr, |
| 2767 | .map = thin_map, |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2768 | .end_io = thin_endio, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2769 | .postsuspend = thin_postsuspend, |
| 2770 | .status = thin_status, |
| 2771 | .iterate_devices = thin_iterate_devices, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2772 | }; |
| 2773 | |
| 2774 | /*----------------------------------------------------------------*/ |
| 2775 | |
| 2776 | static int __init dm_thin_init(void) |
| 2777 | { |
| 2778 | int r; |
| 2779 | |
| 2780 | pool_table_init(); |
| 2781 | |
| 2782 | r = dm_register_target(&thin_target); |
| 2783 | if (r) |
| 2784 | return r; |
| 2785 | |
| 2786 | r = dm_register_target(&pool_target); |
| 2787 | if (r) |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2788 | goto bad_pool_target; |
| 2789 | |
| 2790 | r = -ENOMEM; |
| 2791 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2792 | _new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, 0); |
| 2793 | if (!_new_mapping_cache) |
| 2794 | goto bad_new_mapping_cache; |
| 2795 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2796 | return 0; |
| 2797 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2798 | bad_new_mapping_cache: |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2799 | dm_unregister_target(&pool_target); |
| 2800 | bad_pool_target: |
| 2801 | dm_unregister_target(&thin_target); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2802 | |
| 2803 | return r; |
| 2804 | } |
| 2805 | |
| 2806 | static void dm_thin_exit(void) |
| 2807 | { |
| 2808 | dm_unregister_target(&thin_target); |
| 2809 | dm_unregister_target(&pool_target); |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2810 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 2811 | kmem_cache_destroy(_new_mapping_cache); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2812 | } |
| 2813 | |
| 2814 | module_init(dm_thin_init); |
| 2815 | module_exit(dm_thin_exit); |
| 2816 | |
Alasdair G Kergon | 7cab8bf | 2012-05-12 01:43:19 +0100 | [diff] [blame] | 2817 | MODULE_DESCRIPTION(DM_NAME " thin provisioning target"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2818 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); |
| 2819 | MODULE_LICENSE("GPL"); |