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> |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 15 | #include <linux/rculist.h> |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 16 | #include <linux/init.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/slab.h> |
| 19 | |
| 20 | #define DM_MSG_PREFIX "thin" |
| 21 | |
| 22 | /* |
| 23 | * Tunable constants |
| 24 | */ |
Alasdair G Kergon | 7768ed3 | 2012-07-27 15:07:57 +0100 | [diff] [blame] | 25 | #define ENDIO_HOOK_POOL_SIZE 1024 |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 26 | #define MAPPING_POOL_SIZE 1024 |
| 27 | #define PRISON_CELLS 1024 |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 28 | #define COMMIT_PERIOD HZ |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 29 | |
Mikulas Patocka | df5d2e9 | 2013-03-01 22:45:49 +0000 | [diff] [blame] | 30 | DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(snapshot_copy_throttle, |
| 31 | "A percentage of time allocated for copy on write"); |
| 32 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 33 | /* |
| 34 | * The block size of the device holding pool data must be |
| 35 | * between 64KB and 1GB. |
| 36 | */ |
| 37 | #define DATA_DEV_BLOCK_SIZE_MIN_SECTORS (64 * 1024 >> SECTOR_SHIFT) |
| 38 | #define DATA_DEV_BLOCK_SIZE_MAX_SECTORS (1024 * 1024 * 1024 >> SECTOR_SHIFT) |
| 39 | |
| 40 | /* |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 41 | * Device id is restricted to 24 bits. |
| 42 | */ |
| 43 | #define MAX_DEV_ID ((1 << 24) - 1) |
| 44 | |
| 45 | /* |
| 46 | * How do we handle breaking sharing of data blocks? |
| 47 | * ================================================= |
| 48 | * |
| 49 | * We use a standard copy-on-write btree to store the mappings for the |
| 50 | * devices (note I'm talking about copy-on-write of the metadata here, not |
| 51 | * the data). When you take an internal snapshot you clone the root node |
| 52 | * of the origin btree. After this there is no concept of an origin or a |
| 53 | * snapshot. They are just two device trees that happen to point to the |
| 54 | * same data blocks. |
| 55 | * |
| 56 | * When we get a write in we decide if it's to a shared data block using |
| 57 | * some timestamp magic. If it is, we have to break sharing. |
| 58 | * |
| 59 | * Let's say we write to a shared block in what was the origin. The |
| 60 | * steps are: |
| 61 | * |
| 62 | * i) plug io further to this physical block. (see bio_prison code). |
| 63 | * |
| 64 | * ii) quiesce any read io to that shared data block. Obviously |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 65 | * including all devices that share this block. (see dm_deferred_set code) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 66 | * |
| 67 | * iii) copy the data block to a newly allocate block. This step can be |
| 68 | * missed out if the io covers the block. (schedule_copy). |
| 69 | * |
| 70 | * iv) insert the new mapping into the origin's btree |
Joe Thornber | fe878f3 | 2012-03-28 18:41:24 +0100 | [diff] [blame] | 71 | * (process_prepared_mapping). This act of inserting breaks some |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 72 | * sharing of btree nodes between the two devices. Breaking sharing only |
| 73 | * effects the btree of that specific device. Btrees for the other |
| 74 | * devices that share the block never change. The btree for the origin |
| 75 | * device as it was after the last commit is untouched, ie. we're using |
| 76 | * persistent data structures in the functional programming sense. |
| 77 | * |
| 78 | * v) unplug io to this physical block, including the io that triggered |
| 79 | * the breaking of sharing. |
| 80 | * |
| 81 | * Steps (ii) and (iii) occur in parallel. |
| 82 | * |
| 83 | * The metadata _doesn't_ need to be committed before the io continues. We |
| 84 | * get away with this because the io is always written to a _new_ block. |
| 85 | * If there's a crash, then: |
| 86 | * |
| 87 | * - The origin mapping will point to the old origin block (the shared |
| 88 | * one). This will contain the data as it was before the io that triggered |
| 89 | * the breaking of sharing came in. |
| 90 | * |
| 91 | * - The snap mapping still points to the old block. As it would after |
| 92 | * the commit. |
| 93 | * |
| 94 | * The downside of this scheme is the timestamp magic isn't perfect, and |
| 95 | * will continue to think that data block in the snapshot device is shared |
| 96 | * even after the write to the origin has broken sharing. I suspect data |
| 97 | * blocks will typically be shared by many different devices, so we're |
| 98 | * breaking sharing n + 1 times, rather than n, where n is the number of |
| 99 | * devices that reference this data block. At the moment I think the |
| 100 | * benefits far, far outweigh the disadvantages. |
| 101 | */ |
| 102 | |
| 103 | /*----------------------------------------------------------------*/ |
| 104 | |
| 105 | /* |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 106 | * Key building. |
| 107 | */ |
| 108 | static void build_data_key(struct dm_thin_device *td, |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 109 | dm_block_t b, struct dm_cell_key *key) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 110 | { |
| 111 | key->virtual = 0; |
| 112 | key->dev = dm_thin_dev_id(td); |
| 113 | key->block = b; |
| 114 | } |
| 115 | |
| 116 | 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] | 117 | struct dm_cell_key *key) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 118 | { |
| 119 | key->virtual = 1; |
| 120 | key->dev = dm_thin_dev_id(td); |
| 121 | key->block = b; |
| 122 | } |
| 123 | |
| 124 | /*----------------------------------------------------------------*/ |
| 125 | |
| 126 | /* |
| 127 | * A pool device ties together a metadata device and a data device. It |
| 128 | * also provides the interface for creating and destroying internal |
| 129 | * devices. |
| 130 | */ |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 131 | struct dm_thin_new_mapping; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 132 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 133 | /* |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 134 | * The pool runs in 4 modes. Ordered in degraded order for comparisons. |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 135 | */ |
| 136 | enum pool_mode { |
| 137 | PM_WRITE, /* metadata may be changed */ |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 138 | PM_OUT_OF_DATA_SPACE, /* metadata may be changed, though data may not be allocated */ |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 139 | PM_READ_ONLY, /* metadata may not be changed */ |
| 140 | PM_FAIL, /* all I/O fails */ |
| 141 | }; |
| 142 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 143 | struct pool_features { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 144 | enum pool_mode mode; |
| 145 | |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 146 | bool zero_new_blocks:1; |
| 147 | bool discard_enabled:1; |
| 148 | bool discard_passdown:1; |
Mike Snitzer | 787a996c | 2013-12-06 16:21:43 -0500 | [diff] [blame] | 149 | bool error_if_no_space:1; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 150 | }; |
| 151 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 152 | struct thin_c; |
| 153 | typedef void (*process_bio_fn)(struct thin_c *tc, struct bio *bio); |
| 154 | typedef void (*process_mapping_fn)(struct dm_thin_new_mapping *m); |
| 155 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 156 | struct pool { |
| 157 | struct list_head list; |
| 158 | struct dm_target *ti; /* Only set if a pool target is bound */ |
| 159 | |
| 160 | struct mapped_device *pool_md; |
| 161 | struct block_device *md_dev; |
| 162 | struct dm_pool_metadata *pmd; |
| 163 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 164 | dm_block_t low_water_blocks; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 165 | uint32_t sectors_per_block; |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 166 | int sectors_per_block_shift; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 167 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 168 | struct pool_features pf; |
Joe Thornber | 88a6621 | 2013-12-04 20:16:12 -0500 | [diff] [blame] | 169 | bool low_water_triggered:1; /* A dm event has been sent */ |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 170 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 171 | struct dm_bio_prison *prison; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 172 | struct dm_kcopyd_client *copier; |
| 173 | |
| 174 | struct workqueue_struct *wq; |
| 175 | struct work_struct worker; |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 176 | struct delayed_work waker; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 177 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 178 | unsigned long last_commit_jiffies; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 179 | unsigned ref_count; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 180 | |
| 181 | spinlock_t lock; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 182 | struct bio_list deferred_flush_bios; |
| 183 | struct list_head prepared_mappings; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 184 | struct list_head prepared_discards; |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 185 | struct list_head active_thins; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 186 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 187 | struct dm_deferred_set *shared_read_ds; |
| 188 | struct dm_deferred_set *all_io_ds; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 189 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 190 | struct dm_thin_new_mapping *next_mapping; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 191 | mempool_t *mapping_pool; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 192 | |
| 193 | process_bio_fn process_bio; |
| 194 | process_bio_fn process_discard; |
| 195 | |
| 196 | process_mapping_fn process_prepared_mapping; |
| 197 | process_mapping_fn process_prepared_discard; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 198 | }; |
| 199 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 200 | static enum pool_mode get_pool_mode(struct pool *pool); |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 201 | static void metadata_operation_failed(struct pool *pool, const char *op, int r); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 202 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 203 | /* |
| 204 | * Target context for a pool. |
| 205 | */ |
| 206 | struct pool_c { |
| 207 | struct dm_target *ti; |
| 208 | struct pool *pool; |
| 209 | struct dm_dev *data_dev; |
| 210 | struct dm_dev *metadata_dev; |
| 211 | struct dm_target_callbacks callbacks; |
| 212 | |
| 213 | dm_block_t low_water_blocks; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 214 | struct pool_features requested_pf; /* Features requested during table load */ |
| 215 | struct pool_features adjusted_pf; /* Features used after adjusting for constituent devices */ |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 216 | }; |
| 217 | |
| 218 | /* |
| 219 | * Target context for a thin. |
| 220 | */ |
| 221 | struct thin_c { |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 222 | struct list_head list; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 223 | struct dm_dev *pool_dev; |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 224 | struct dm_dev *origin_dev; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 225 | dm_thin_id dev_id; |
| 226 | |
| 227 | struct pool *pool; |
| 228 | struct dm_thin_device *td; |
Joe Thornber | 738211f | 2014-03-03 15:52:28 +0000 | [diff] [blame] | 229 | bool requeue_mode:1; |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 230 | spinlock_t lock; |
| 231 | struct bio_list deferred_bio_list; |
| 232 | struct bio_list retry_on_resume_list; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 233 | }; |
| 234 | |
| 235 | /*----------------------------------------------------------------*/ |
| 236 | |
Joe Thornber | 025b968 | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 237 | /* |
| 238 | * wake_worker() is used when new work is queued and when pool_resume is |
| 239 | * ready to continue deferred IO processing. |
| 240 | */ |
| 241 | static void wake_worker(struct pool *pool) |
| 242 | { |
| 243 | queue_work(pool->wq, &pool->worker); |
| 244 | } |
| 245 | |
| 246 | /*----------------------------------------------------------------*/ |
| 247 | |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 248 | static int bio_detain(struct pool *pool, struct dm_cell_key *key, struct bio *bio, |
| 249 | struct dm_bio_prison_cell **cell_result) |
| 250 | { |
| 251 | int r; |
| 252 | struct dm_bio_prison_cell *cell_prealloc; |
| 253 | |
| 254 | /* |
| 255 | * Allocate a cell from the prison's mempool. |
| 256 | * This might block but it can't fail. |
| 257 | */ |
| 258 | cell_prealloc = dm_bio_prison_alloc_cell(pool->prison, GFP_NOIO); |
| 259 | |
| 260 | r = dm_bio_detain(pool->prison, key, bio, cell_prealloc, cell_result); |
| 261 | if (r) |
| 262 | /* |
| 263 | * We reused an old cell; we can get rid of |
| 264 | * the new one. |
| 265 | */ |
| 266 | dm_bio_prison_free_cell(pool->prison, cell_prealloc); |
| 267 | |
| 268 | return r; |
| 269 | } |
| 270 | |
| 271 | static void cell_release(struct pool *pool, |
| 272 | struct dm_bio_prison_cell *cell, |
| 273 | struct bio_list *bios) |
| 274 | { |
| 275 | dm_cell_release(pool->prison, cell, bios); |
| 276 | dm_bio_prison_free_cell(pool->prison, cell); |
| 277 | } |
| 278 | |
| 279 | static void cell_release_no_holder(struct pool *pool, |
| 280 | struct dm_bio_prison_cell *cell, |
| 281 | struct bio_list *bios) |
| 282 | { |
| 283 | dm_cell_release_no_holder(pool->prison, cell, bios); |
| 284 | dm_bio_prison_free_cell(pool->prison, cell); |
| 285 | } |
| 286 | |
Joe Thornber | 025b968 | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 287 | static void cell_defer_no_holder_no_free(struct thin_c *tc, |
| 288 | struct dm_bio_prison_cell *cell) |
| 289 | { |
| 290 | struct pool *pool = tc->pool; |
| 291 | unsigned long flags; |
| 292 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 293 | spin_lock_irqsave(&tc->lock, flags); |
| 294 | dm_cell_release_no_holder(pool->prison, cell, &tc->deferred_bio_list); |
| 295 | spin_unlock_irqrestore(&tc->lock, flags); |
Joe Thornber | 025b968 | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 296 | |
| 297 | wake_worker(pool); |
| 298 | } |
| 299 | |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 300 | static void cell_error(struct pool *pool, |
| 301 | struct dm_bio_prison_cell *cell) |
| 302 | { |
| 303 | dm_cell_error(pool->prison, cell); |
| 304 | dm_bio_prison_free_cell(pool->prison, cell); |
| 305 | } |
| 306 | |
| 307 | /*----------------------------------------------------------------*/ |
| 308 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 309 | /* |
| 310 | * A global list of pools that uses a struct mapped_device as a key. |
| 311 | */ |
| 312 | static struct dm_thin_pool_table { |
| 313 | struct mutex mutex; |
| 314 | struct list_head pools; |
| 315 | } dm_thin_pool_table; |
| 316 | |
| 317 | static void pool_table_init(void) |
| 318 | { |
| 319 | mutex_init(&dm_thin_pool_table.mutex); |
| 320 | INIT_LIST_HEAD(&dm_thin_pool_table.pools); |
| 321 | } |
| 322 | |
| 323 | static void __pool_table_insert(struct pool *pool) |
| 324 | { |
| 325 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 326 | list_add(&pool->list, &dm_thin_pool_table.pools); |
| 327 | } |
| 328 | |
| 329 | static void __pool_table_remove(struct pool *pool) |
| 330 | { |
| 331 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 332 | list_del(&pool->list); |
| 333 | } |
| 334 | |
| 335 | static struct pool *__pool_table_lookup(struct mapped_device *md) |
| 336 | { |
| 337 | struct pool *pool = NULL, *tmp; |
| 338 | |
| 339 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 340 | |
| 341 | list_for_each_entry(tmp, &dm_thin_pool_table.pools, list) { |
| 342 | if (tmp->pool_md == md) { |
| 343 | pool = tmp; |
| 344 | break; |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | return pool; |
| 349 | } |
| 350 | |
| 351 | static struct pool *__pool_table_lookup_metadata_dev(struct block_device *md_dev) |
| 352 | { |
| 353 | struct pool *pool = NULL, *tmp; |
| 354 | |
| 355 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 356 | |
| 357 | list_for_each_entry(tmp, &dm_thin_pool_table.pools, list) { |
| 358 | if (tmp->md_dev == md_dev) { |
| 359 | pool = tmp; |
| 360 | break; |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | return pool; |
| 365 | } |
| 366 | |
| 367 | /*----------------------------------------------------------------*/ |
| 368 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 369 | struct dm_thin_endio_hook { |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 370 | struct thin_c *tc; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 371 | struct dm_deferred_entry *shared_read_entry; |
| 372 | struct dm_deferred_entry *all_io_entry; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 373 | struct dm_thin_new_mapping *overwrite_mapping; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 374 | }; |
| 375 | |
Joe Thornber | 18adc57 | 2014-03-03 15:46:42 +0000 | [diff] [blame] | 376 | static void requeue_bio_list(struct thin_c *tc, struct bio_list *master) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 377 | { |
| 378 | struct bio *bio; |
| 379 | struct bio_list bios; |
Joe Thornber | 18adc57 | 2014-03-03 15:46:42 +0000 | [diff] [blame] | 380 | unsigned long flags; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 381 | |
| 382 | bio_list_init(&bios); |
Joe Thornber | 18adc57 | 2014-03-03 15:46:42 +0000 | [diff] [blame] | 383 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 384 | spin_lock_irqsave(&tc->lock, flags); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 385 | bio_list_merge(&bios, master); |
| 386 | bio_list_init(master); |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 387 | spin_unlock_irqrestore(&tc->lock, flags); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 388 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 389 | while ((bio = bio_list_pop(&bios))) |
| 390 | bio_endio(bio, DM_ENDIO_REQUEUE); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | static void requeue_io(struct thin_c *tc) |
| 394 | { |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 395 | requeue_bio_list(tc, &tc->deferred_bio_list); |
| 396 | requeue_bio_list(tc, &tc->retry_on_resume_list); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 397 | } |
| 398 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 399 | static void error_thin_retry_list(struct thin_c *tc) |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 400 | { |
| 401 | struct bio *bio; |
| 402 | unsigned long flags; |
| 403 | struct bio_list bios; |
| 404 | |
| 405 | bio_list_init(&bios); |
| 406 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 407 | spin_lock_irqsave(&tc->lock, flags); |
| 408 | bio_list_merge(&bios, &tc->retry_on_resume_list); |
| 409 | bio_list_init(&tc->retry_on_resume_list); |
| 410 | spin_unlock_irqrestore(&tc->lock, flags); |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 411 | |
| 412 | while ((bio = bio_list_pop(&bios))) |
| 413 | bio_io_error(bio); |
| 414 | } |
| 415 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 416 | static void error_retry_list(struct pool *pool) |
| 417 | { |
| 418 | struct thin_c *tc; |
| 419 | |
| 420 | rcu_read_lock(); |
| 421 | list_for_each_entry_rcu(tc, &pool->active_thins, list) |
| 422 | error_thin_retry_list(tc); |
| 423 | rcu_read_unlock(); |
| 424 | } |
| 425 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 426 | /* |
| 427 | * This section of code contains the logic for processing a thin device's IO. |
| 428 | * Much of the code depends on pool object resources (lists, workqueues, etc) |
| 429 | * but most is exclusively called from the thin target rather than the thin-pool |
| 430 | * target. |
| 431 | */ |
| 432 | |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 433 | static bool block_size_is_power_of_two(struct pool *pool) |
| 434 | { |
| 435 | return pool->sectors_per_block_shift >= 0; |
| 436 | } |
| 437 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 438 | static dm_block_t get_bio_block(struct thin_c *tc, struct bio *bio) |
| 439 | { |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 440 | struct pool *pool = tc->pool; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 441 | sector_t block_nr = bio->bi_iter.bi_sector; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 442 | |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 443 | if (block_size_is_power_of_two(pool)) |
| 444 | block_nr >>= pool->sectors_per_block_shift; |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 445 | else |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 446 | (void) sector_div(block_nr, pool->sectors_per_block); |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 447 | |
| 448 | return block_nr; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | static void remap(struct thin_c *tc, struct bio *bio, dm_block_t block) |
| 452 | { |
| 453 | struct pool *pool = tc->pool; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 454 | sector_t bi_sector = bio->bi_iter.bi_sector; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 455 | |
| 456 | bio->bi_bdev = tc->pool_dev->bdev; |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 457 | if (block_size_is_power_of_two(pool)) |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 458 | bio->bi_iter.bi_sector = |
| 459 | (block << pool->sectors_per_block_shift) | |
| 460 | (bi_sector & (pool->sectors_per_block - 1)); |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 461 | else |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 462 | bio->bi_iter.bi_sector = (block * pool->sectors_per_block) + |
Mike Snitzer | 58f77a2 | 2013-03-01 22:45:45 +0000 | [diff] [blame] | 463 | sector_div(bi_sector, pool->sectors_per_block); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 464 | } |
| 465 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 466 | static void remap_to_origin(struct thin_c *tc, struct bio *bio) |
| 467 | { |
| 468 | bio->bi_bdev = tc->origin_dev->bdev; |
| 469 | } |
| 470 | |
Joe Thornber | 4afdd68 | 2012-07-27 15:08:14 +0100 | [diff] [blame] | 471 | static int bio_triggers_commit(struct thin_c *tc, struct bio *bio) |
| 472 | { |
| 473 | return (bio->bi_rw & (REQ_FLUSH | REQ_FUA)) && |
| 474 | dm_thin_changed_this_transaction(tc->td); |
| 475 | } |
| 476 | |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 477 | static void inc_all_io_entry(struct pool *pool, struct bio *bio) |
| 478 | { |
| 479 | struct dm_thin_endio_hook *h; |
| 480 | |
| 481 | if (bio->bi_rw & REQ_DISCARD) |
| 482 | return; |
| 483 | |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 484 | h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 485 | h->all_io_entry = dm_deferred_entry_inc(pool->all_io_ds); |
| 486 | } |
| 487 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 488 | static void issue(struct thin_c *tc, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 489 | { |
| 490 | struct pool *pool = tc->pool; |
| 491 | unsigned long flags; |
| 492 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 493 | if (!bio_triggers_commit(tc, bio)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 494 | generic_make_request(bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 495 | return; |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Complete bio with an error if earlier I/O caused changes to |
| 500 | * the metadata that can't be committed e.g, due to I/O errors |
| 501 | * on the metadata device. |
| 502 | */ |
| 503 | if (dm_thin_aborted_changes(tc->td)) { |
| 504 | bio_io_error(bio); |
| 505 | return; |
| 506 | } |
| 507 | |
| 508 | /* |
| 509 | * Batch together any bios that trigger commits and then issue a |
| 510 | * single commit for them in process_deferred_bios(). |
| 511 | */ |
| 512 | spin_lock_irqsave(&pool->lock, flags); |
| 513 | bio_list_add(&pool->deferred_flush_bios, bio); |
| 514 | spin_unlock_irqrestore(&pool->lock, flags); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 515 | } |
| 516 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 517 | static void remap_to_origin_and_issue(struct thin_c *tc, struct bio *bio) |
| 518 | { |
| 519 | remap_to_origin(tc, bio); |
| 520 | issue(tc, bio); |
| 521 | } |
| 522 | |
| 523 | static void remap_and_issue(struct thin_c *tc, struct bio *bio, |
| 524 | dm_block_t block) |
| 525 | { |
| 526 | remap(tc, bio, block); |
| 527 | issue(tc, bio); |
| 528 | } |
| 529 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 530 | /*----------------------------------------------------------------*/ |
| 531 | |
| 532 | /* |
| 533 | * Bio endio functions. |
| 534 | */ |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 535 | struct dm_thin_new_mapping { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 536 | struct list_head list; |
| 537 | |
Mike Snitzer | 7f21466 | 2013-12-17 13:43:31 -0500 | [diff] [blame] | 538 | bool quiesced:1; |
| 539 | bool prepared:1; |
| 540 | bool pass_discard:1; |
| 541 | bool definitely_not_shared:1; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 542 | |
Mike Snitzer | 7f21466 | 2013-12-17 13:43:31 -0500 | [diff] [blame] | 543 | int err; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 544 | struct thin_c *tc; |
| 545 | dm_block_t virt_block; |
| 546 | dm_block_t data_block; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 547 | struct dm_bio_prison_cell *cell, *cell2; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 548 | |
| 549 | /* |
| 550 | * If the bio covers the whole area of a block then we can avoid |
| 551 | * zeroing or copying. Instead this bio is hooked. The bio will |
| 552 | * still be in the cell, so care has to be taken to avoid issuing |
| 553 | * the bio twice. |
| 554 | */ |
| 555 | struct bio *bio; |
| 556 | bio_end_io_t *saved_bi_end_io; |
| 557 | }; |
| 558 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 559 | static void __maybe_add_mapping(struct dm_thin_new_mapping *m) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 560 | { |
| 561 | struct pool *pool = m->tc->pool; |
| 562 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 563 | if (m->quiesced && m->prepared) { |
Mike Snitzer | daec338 | 2013-12-11 14:01:20 -0500 | [diff] [blame] | 564 | list_add_tail(&m->list, &pool->prepared_mappings); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 565 | wake_worker(pool); |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | static void copy_complete(int read_err, unsigned long write_err, void *context) |
| 570 | { |
| 571 | unsigned long flags; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 572 | struct dm_thin_new_mapping *m = context; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 573 | struct pool *pool = m->tc->pool; |
| 574 | |
| 575 | m->err = read_err || write_err ? -EIO : 0; |
| 576 | |
| 577 | spin_lock_irqsave(&pool->lock, flags); |
Mike Snitzer | 7f21466 | 2013-12-17 13:43:31 -0500 | [diff] [blame] | 578 | m->prepared = true; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 579 | __maybe_add_mapping(m); |
| 580 | spin_unlock_irqrestore(&pool->lock, flags); |
| 581 | } |
| 582 | |
| 583 | static void overwrite_endio(struct bio *bio, int err) |
| 584 | { |
| 585 | unsigned long flags; |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 586 | 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] | 587 | struct dm_thin_new_mapping *m = h->overwrite_mapping; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 588 | struct pool *pool = m->tc->pool; |
| 589 | |
| 590 | m->err = err; |
| 591 | |
| 592 | spin_lock_irqsave(&pool->lock, flags); |
Mike Snitzer | 7f21466 | 2013-12-17 13:43:31 -0500 | [diff] [blame] | 593 | m->prepared = true; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 594 | __maybe_add_mapping(m); |
| 595 | spin_unlock_irqrestore(&pool->lock, flags); |
| 596 | } |
| 597 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 598 | /*----------------------------------------------------------------*/ |
| 599 | |
| 600 | /* |
| 601 | * Workqueue. |
| 602 | */ |
| 603 | |
| 604 | /* |
| 605 | * Prepared mapping jobs. |
| 606 | */ |
| 607 | |
| 608 | /* |
| 609 | * This sends the bios in the cell back to the deferred_bios list. |
| 610 | */ |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 611 | 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] | 612 | { |
| 613 | struct pool *pool = tc->pool; |
| 614 | unsigned long flags; |
| 615 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 616 | spin_lock_irqsave(&tc->lock, flags); |
| 617 | cell_release(pool, cell, &tc->deferred_bio_list); |
| 618 | spin_unlock_irqrestore(&tc->lock, flags); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 619 | |
| 620 | wake_worker(pool); |
| 621 | } |
| 622 | |
| 623 | /* |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 624 | * Same as cell_defer above, except it omits the original holder of the cell. |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 625 | */ |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 626 | 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] | 627 | { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 628 | struct pool *pool = tc->pool; |
| 629 | unsigned long flags; |
| 630 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 631 | spin_lock_irqsave(&tc->lock, flags); |
| 632 | cell_release_no_holder(pool, cell, &tc->deferred_bio_list); |
| 633 | spin_unlock_irqrestore(&tc->lock, flags); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 634 | |
| 635 | wake_worker(pool); |
| 636 | } |
| 637 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 638 | static void process_prepared_mapping_fail(struct dm_thin_new_mapping *m) |
| 639 | { |
Kent Overstreet | 196d38b | 2013-11-23 18:34:15 -0800 | [diff] [blame] | 640 | if (m->bio) { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 641 | m->bio->bi_end_io = m->saved_bi_end_io; |
Kent Overstreet | 196d38b | 2013-11-23 18:34:15 -0800 | [diff] [blame] | 642 | atomic_inc(&m->bio->bi_remaining); |
| 643 | } |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 644 | cell_error(m->tc->pool, m->cell); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 645 | list_del(&m->list); |
| 646 | mempool_free(m, m->tc->pool->mapping_pool); |
| 647 | } |
Joe Thornber | 025b968 | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 648 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 649 | static void process_prepared_mapping(struct dm_thin_new_mapping *m) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 650 | { |
| 651 | struct thin_c *tc = m->tc; |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 652 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 653 | struct bio *bio; |
| 654 | int r; |
| 655 | |
| 656 | bio = m->bio; |
Kent Overstreet | 196d38b | 2013-11-23 18:34:15 -0800 | [diff] [blame] | 657 | if (bio) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 658 | bio->bi_end_io = m->saved_bi_end_io; |
Kent Overstreet | 196d38b | 2013-11-23 18:34:15 -0800 | [diff] [blame] | 659 | atomic_inc(&bio->bi_remaining); |
| 660 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 661 | |
| 662 | if (m->err) { |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 663 | cell_error(pool, m->cell); |
Joe Thornber | 905386f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 664 | goto out; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | /* |
| 668 | * Commit the prepared block into the mapping btree. |
| 669 | * Any I/O for this block arriving after this point will get |
| 670 | * remapped to it directly. |
| 671 | */ |
| 672 | r = dm_thin_insert_block(tc->td, m->virt_block, m->data_block); |
| 673 | if (r) { |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 674 | metadata_operation_failed(pool, "dm_thin_insert_block", r); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 675 | cell_error(pool, m->cell); |
Joe Thornber | 905386f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 676 | goto out; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 677 | } |
| 678 | |
| 679 | /* |
| 680 | * Release any bios held while the block was being provisioned. |
| 681 | * If we are processing a write bio that completely covers the block, |
| 682 | * we already processed it so can ignore it now when processing |
| 683 | * the bios in the cell. |
| 684 | */ |
| 685 | if (bio) { |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 686 | cell_defer_no_holder(tc, m->cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 687 | bio_endio(bio, 0); |
| 688 | } else |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 689 | cell_defer(tc, m->cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 690 | |
Joe Thornber | 905386f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 691 | out: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 692 | list_del(&m->list); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 693 | mempool_free(m, pool->mapping_pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 694 | } |
| 695 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 696 | static void process_prepared_discard_fail(struct dm_thin_new_mapping *m) |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 697 | { |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 698 | struct thin_c *tc = m->tc; |
| 699 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 700 | bio_io_error(m->bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 701 | cell_defer_no_holder(tc, m->cell); |
| 702 | cell_defer_no_holder(tc, m->cell2); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 703 | mempool_free(m, tc->pool->mapping_pool); |
| 704 | } |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 705 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 706 | static void process_prepared_discard_passdown(struct dm_thin_new_mapping *m) |
| 707 | { |
| 708 | struct thin_c *tc = m->tc; |
| 709 | |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 710 | inc_all_io_entry(tc->pool, m->bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 711 | cell_defer_no_holder(tc, m->cell); |
| 712 | cell_defer_no_holder(tc, m->cell2); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 713 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 714 | if (m->pass_discard) |
Joe Thornber | 19fa1a6 | 2013-12-17 12:09:40 -0500 | [diff] [blame] | 715 | if (m->definitely_not_shared) |
| 716 | remap_and_issue(tc, m->bio, m->data_block); |
| 717 | else { |
| 718 | bool used = false; |
| 719 | if (dm_pool_block_is_used(tc->pool->pmd, m->data_block, &used) || used) |
| 720 | bio_endio(m->bio, 0); |
| 721 | else |
| 722 | remap_and_issue(tc, m->bio, m->data_block); |
| 723 | } |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 724 | else |
| 725 | bio_endio(m->bio, 0); |
| 726 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 727 | mempool_free(m, tc->pool->mapping_pool); |
| 728 | } |
| 729 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 730 | static void process_prepared_discard(struct dm_thin_new_mapping *m) |
| 731 | { |
| 732 | int r; |
| 733 | struct thin_c *tc = m->tc; |
| 734 | |
| 735 | r = dm_thin_remove_block(tc->td, m->virt_block); |
| 736 | if (r) |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 737 | DMERR_LIMIT("dm_thin_remove_block() failed"); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 738 | |
| 739 | process_prepared_discard_passdown(m); |
| 740 | } |
| 741 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 742 | static void process_prepared(struct pool *pool, struct list_head *head, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 743 | process_mapping_fn *fn) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 744 | { |
| 745 | unsigned long flags; |
| 746 | struct list_head maps; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 747 | struct dm_thin_new_mapping *m, *tmp; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 748 | |
| 749 | INIT_LIST_HEAD(&maps); |
| 750 | spin_lock_irqsave(&pool->lock, flags); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 751 | list_splice_init(head, &maps); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 752 | spin_unlock_irqrestore(&pool->lock, flags); |
| 753 | |
| 754 | list_for_each_entry_safe(m, tmp, &maps, list) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 755 | (*fn)(m); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 756 | } |
| 757 | |
| 758 | /* |
| 759 | * Deferred bio jobs. |
| 760 | */ |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 761 | static int io_overlaps_block(struct pool *pool, struct bio *bio) |
| 762 | { |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 763 | return bio->bi_iter.bi_size == |
| 764 | (pool->sectors_per_block << SECTOR_SHIFT); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 765 | } |
| 766 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 767 | static int io_overwrites_block(struct pool *pool, struct bio *bio) |
| 768 | { |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 769 | return (bio_data_dir(bio) == WRITE) && |
| 770 | io_overlaps_block(pool, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | static void save_and_set_endio(struct bio *bio, bio_end_io_t **save, |
| 774 | bio_end_io_t *fn) |
| 775 | { |
| 776 | *save = bio->bi_end_io; |
| 777 | bio->bi_end_io = fn; |
| 778 | } |
| 779 | |
| 780 | static int ensure_next_mapping(struct pool *pool) |
| 781 | { |
| 782 | if (pool->next_mapping) |
| 783 | return 0; |
| 784 | |
| 785 | pool->next_mapping = mempool_alloc(pool->mapping_pool, GFP_ATOMIC); |
| 786 | |
| 787 | return pool->next_mapping ? 0 : -ENOMEM; |
| 788 | } |
| 789 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 790 | static struct dm_thin_new_mapping *get_next_mapping(struct pool *pool) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 791 | { |
Mike Snitzer | 16961b0 | 2013-12-17 13:19:11 -0500 | [diff] [blame] | 792 | struct dm_thin_new_mapping *m = pool->next_mapping; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 793 | |
| 794 | BUG_ON(!pool->next_mapping); |
| 795 | |
Mike Snitzer | 16961b0 | 2013-12-17 13:19:11 -0500 | [diff] [blame] | 796 | memset(m, 0, sizeof(struct dm_thin_new_mapping)); |
| 797 | INIT_LIST_HEAD(&m->list); |
| 798 | m->bio = NULL; |
| 799 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 800 | pool->next_mapping = NULL; |
| 801 | |
Mike Snitzer | 16961b0 | 2013-12-17 13:19:11 -0500 | [diff] [blame] | 802 | return m; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 803 | } |
| 804 | |
| 805 | 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] | 806 | struct dm_dev *origin, dm_block_t data_origin, |
| 807 | dm_block_t data_dest, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 808 | struct dm_bio_prison_cell *cell, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 809 | { |
| 810 | int r; |
| 811 | struct pool *pool = tc->pool; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 812 | struct dm_thin_new_mapping *m = get_next_mapping(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 813 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 814 | m->tc = tc; |
| 815 | m->virt_block = virt_block; |
| 816 | m->data_block = data_dest; |
| 817 | m->cell = cell; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 818 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 819 | if (!dm_deferred_set_add_work(pool->shared_read_ds, &m->list)) |
Mike Snitzer | 7f21466 | 2013-12-17 13:43:31 -0500 | [diff] [blame] | 820 | m->quiesced = true; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 821 | |
| 822 | /* |
| 823 | * IO to pool_dev remaps to the pool target's data_dev. |
| 824 | * |
| 825 | * If the whole block of data is being overwritten, we can issue the |
| 826 | * bio immediately. Otherwise we use kcopyd to clone the data first. |
| 827 | */ |
| 828 | if (io_overwrites_block(pool, bio)) { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 829 | 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] | 830 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 831 | h->overwrite_mapping = m; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 832 | m->bio = bio; |
| 833 | save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 834 | inc_all_io_entry(pool, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 835 | remap_and_issue(tc, bio, data_dest); |
| 836 | } else { |
| 837 | struct dm_io_region from, to; |
| 838 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 839 | from.bdev = origin->bdev; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 840 | from.sector = data_origin * pool->sectors_per_block; |
| 841 | from.count = pool->sectors_per_block; |
| 842 | |
| 843 | to.bdev = tc->pool_dev->bdev; |
| 844 | to.sector = data_dest * pool->sectors_per_block; |
| 845 | to.count = pool->sectors_per_block; |
| 846 | |
| 847 | r = dm_kcopyd_copy(pool->copier, &from, 1, &to, |
| 848 | 0, copy_complete, m); |
| 849 | if (r < 0) { |
| 850 | mempool_free(m, pool->mapping_pool); |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 851 | DMERR_LIMIT("dm_kcopyd_copy() failed"); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 852 | cell_error(pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 853 | } |
| 854 | } |
| 855 | } |
| 856 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 857 | static void schedule_internal_copy(struct thin_c *tc, dm_block_t virt_block, |
| 858 | dm_block_t data_origin, dm_block_t data_dest, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 859 | struct dm_bio_prison_cell *cell, struct bio *bio) |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 860 | { |
| 861 | schedule_copy(tc, virt_block, tc->pool_dev, |
| 862 | data_origin, data_dest, cell, bio); |
| 863 | } |
| 864 | |
| 865 | static void schedule_external_copy(struct thin_c *tc, dm_block_t virt_block, |
| 866 | dm_block_t data_dest, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 867 | struct dm_bio_prison_cell *cell, struct bio *bio) |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 868 | { |
| 869 | schedule_copy(tc, virt_block, tc->origin_dev, |
| 870 | virt_block, data_dest, cell, bio); |
| 871 | } |
| 872 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 873 | 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] | 874 | dm_block_t data_block, struct dm_bio_prison_cell *cell, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 875 | struct bio *bio) |
| 876 | { |
| 877 | struct pool *pool = tc->pool; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 878 | struct dm_thin_new_mapping *m = get_next_mapping(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 879 | |
Mike Snitzer | 7f21466 | 2013-12-17 13:43:31 -0500 | [diff] [blame] | 880 | m->quiesced = true; |
| 881 | m->prepared = false; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 882 | m->tc = tc; |
| 883 | m->virt_block = virt_block; |
| 884 | m->data_block = data_block; |
| 885 | m->cell = cell; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 886 | |
| 887 | /* |
| 888 | * If the whole block of data is being overwritten or we are not |
| 889 | * zeroing pre-existing data, we can issue the bio immediately. |
| 890 | * Otherwise we use kcopyd to zero the data first. |
| 891 | */ |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 892 | if (!pool->pf.zero_new_blocks) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 893 | process_prepared_mapping(m); |
| 894 | |
| 895 | else if (io_overwrites_block(pool, bio)) { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 896 | 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] | 897 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 898 | h->overwrite_mapping = m; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 899 | m->bio = bio; |
| 900 | save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 901 | inc_all_io_entry(pool, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 902 | remap_and_issue(tc, bio, data_block); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 903 | } else { |
| 904 | int r; |
| 905 | struct dm_io_region to; |
| 906 | |
| 907 | to.bdev = tc->pool_dev->bdev; |
| 908 | to.sector = data_block * pool->sectors_per_block; |
| 909 | to.count = pool->sectors_per_block; |
| 910 | |
| 911 | r = dm_kcopyd_zero(pool->copier, 1, &to, 0, copy_complete, m); |
| 912 | if (r < 0) { |
| 913 | mempool_free(m, pool->mapping_pool); |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 914 | DMERR_LIMIT("dm_kcopyd_zero() failed"); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 915 | cell_error(pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 916 | } |
| 917 | } |
| 918 | } |
| 919 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 920 | /* |
| 921 | * A non-zero return indicates read_only or fail_io mode. |
| 922 | * Many callers don't care about the return value. |
| 923 | */ |
Joe Thornber | 020cc3b | 2013-12-04 15:05:36 -0500 | [diff] [blame] | 924 | static int commit(struct pool *pool) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 925 | { |
| 926 | int r; |
| 927 | |
| 928 | if (get_pool_mode(pool) != PM_WRITE) |
| 929 | return -EINVAL; |
| 930 | |
Joe Thornber | 020cc3b | 2013-12-04 15:05:36 -0500 | [diff] [blame] | 931 | r = dm_pool_commit_metadata(pool->pmd); |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 932 | if (r) |
| 933 | metadata_operation_failed(pool, "dm_pool_commit_metadata", r); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 934 | |
| 935 | return r; |
| 936 | } |
| 937 | |
Joe Thornber | 88a6621 | 2013-12-04 20:16:12 -0500 | [diff] [blame] | 938 | static void check_low_water_mark(struct pool *pool, dm_block_t free_blocks) |
| 939 | { |
| 940 | unsigned long flags; |
| 941 | |
| 942 | if (free_blocks <= pool->low_water_blocks && !pool->low_water_triggered) { |
| 943 | DMWARN("%s: reached low water mark for data device: sending event.", |
| 944 | dm_device_name(pool->pool_md)); |
| 945 | spin_lock_irqsave(&pool->lock, flags); |
| 946 | pool->low_water_triggered = true; |
| 947 | spin_unlock_irqrestore(&pool->lock, flags); |
| 948 | dm_table_event(pool->ti->table); |
| 949 | } |
| 950 | } |
| 951 | |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 952 | static void set_pool_mode(struct pool *pool, enum pool_mode new_mode); |
| 953 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 954 | static int alloc_data_block(struct thin_c *tc, dm_block_t *result) |
| 955 | { |
| 956 | int r; |
| 957 | dm_block_t free_blocks; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 958 | struct pool *pool = tc->pool; |
| 959 | |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 960 | if (WARN_ON(get_pool_mode(pool) != PM_WRITE)) |
Joe Thornber | 8d30abf | 2013-12-04 19:16:11 -0500 | [diff] [blame] | 961 | return -EINVAL; |
| 962 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 963 | r = dm_pool_get_free_block_count(pool->pmd, &free_blocks); |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 964 | if (r) { |
| 965 | metadata_operation_failed(pool, "dm_pool_get_free_block_count", r); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 966 | return r; |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 967 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 968 | |
Joe Thornber | 88a6621 | 2013-12-04 20:16:12 -0500 | [diff] [blame] | 969 | check_low_water_mark(pool, free_blocks); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 970 | |
| 971 | if (!free_blocks) { |
Mike Snitzer | 94563ba | 2013-08-22 09:56:18 -0400 | [diff] [blame] | 972 | /* |
| 973 | * Try to commit to see if that will free up some |
| 974 | * more space. |
| 975 | */ |
Joe Thornber | 020cc3b | 2013-12-04 15:05:36 -0500 | [diff] [blame] | 976 | r = commit(pool); |
| 977 | if (r) |
| 978 | return r; |
Mike Snitzer | 94563ba | 2013-08-22 09:56:18 -0400 | [diff] [blame] | 979 | |
| 980 | r = dm_pool_get_free_block_count(pool->pmd, &free_blocks); |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 981 | if (r) { |
| 982 | metadata_operation_failed(pool, "dm_pool_get_free_block_count", r); |
Mike Snitzer | 94563ba | 2013-08-22 09:56:18 -0400 | [diff] [blame] | 983 | return r; |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 984 | } |
Mike Snitzer | 94563ba | 2013-08-22 09:56:18 -0400 | [diff] [blame] | 985 | |
Mike Snitzer | 94563ba | 2013-08-22 09:56:18 -0400 | [diff] [blame] | 986 | if (!free_blocks) { |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 987 | set_pool_mode(pool, PM_OUT_OF_DATA_SPACE); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 988 | return -ENOSPC; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 989 | } |
| 990 | } |
| 991 | |
| 992 | r = dm_pool_alloc_data_block(pool->pmd, result); |
Mike Snitzer | 4a02b34 | 2013-12-03 12:20:57 -0500 | [diff] [blame] | 993 | if (r) { |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 994 | metadata_operation_failed(pool, "dm_pool_alloc_data_block", r); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 995 | return r; |
Mike Snitzer | 4a02b34 | 2013-12-03 12:20:57 -0500 | [diff] [blame] | 996 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 997 | |
| 998 | return 0; |
| 999 | } |
| 1000 | |
| 1001 | /* |
| 1002 | * If we have run out of space, queue bios until the device is |
| 1003 | * resumed, presumably after having been reloaded with more space. |
| 1004 | */ |
| 1005 | static void retry_on_resume(struct bio *bio) |
| 1006 | { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1007 | 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] | 1008 | struct thin_c *tc = h->tc; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1009 | unsigned long flags; |
| 1010 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1011 | spin_lock_irqsave(&tc->lock, flags); |
| 1012 | bio_list_add(&tc->retry_on_resume_list, bio); |
| 1013 | spin_unlock_irqrestore(&tc->lock, flags); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1014 | } |
| 1015 | |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 1016 | static bool should_error_unserviceable_bio(struct pool *pool) |
| 1017 | { |
| 1018 | enum pool_mode m = get_pool_mode(pool); |
| 1019 | |
| 1020 | switch (m) { |
| 1021 | case PM_WRITE: |
| 1022 | /* Shouldn't get here */ |
| 1023 | DMERR_LIMIT("bio unserviceable, yet pool is in PM_WRITE mode"); |
| 1024 | return true; |
| 1025 | |
| 1026 | case PM_OUT_OF_DATA_SPACE: |
| 1027 | return pool->pf.error_if_no_space; |
| 1028 | |
| 1029 | case PM_READ_ONLY: |
| 1030 | case PM_FAIL: |
| 1031 | return true; |
| 1032 | default: |
| 1033 | /* Shouldn't get here */ |
| 1034 | DMERR_LIMIT("bio unserviceable, yet pool has an unknown mode"); |
| 1035 | return true; |
| 1036 | } |
| 1037 | } |
| 1038 | |
Mike Snitzer | 8c0f0e8 | 2013-12-05 15:47:24 -0500 | [diff] [blame] | 1039 | static void handle_unserviceable_bio(struct pool *pool, struct bio *bio) |
| 1040 | { |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 1041 | if (should_error_unserviceable_bio(pool)) |
Mike Snitzer | 8c0f0e8 | 2013-12-05 15:47:24 -0500 | [diff] [blame] | 1042 | bio_io_error(bio); |
Mike Snitzer | 6d16202 | 2013-12-20 18:09:02 -0500 | [diff] [blame] | 1043 | else |
| 1044 | retry_on_resume(bio); |
Mike Snitzer | 8c0f0e8 | 2013-12-05 15:47:24 -0500 | [diff] [blame] | 1045 | } |
| 1046 | |
Mike Snitzer | 399cadd | 2013-12-05 16:03:33 -0500 | [diff] [blame] | 1047 | static void retry_bios_on_resume(struct pool *pool, struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1048 | { |
| 1049 | struct bio *bio; |
| 1050 | struct bio_list bios; |
| 1051 | |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 1052 | if (should_error_unserviceable_bio(pool)) { |
| 1053 | cell_error(pool, cell); |
| 1054 | return; |
| 1055 | } |
| 1056 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1057 | bio_list_init(&bios); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1058 | cell_release(pool, cell, &bios); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1059 | |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 1060 | if (should_error_unserviceable_bio(pool)) |
| 1061 | while ((bio = bio_list_pop(&bios))) |
| 1062 | bio_io_error(bio); |
| 1063 | else |
| 1064 | while ((bio = bio_list_pop(&bios))) |
| 1065 | retry_on_resume(bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1066 | } |
| 1067 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1068 | static void process_discard(struct thin_c *tc, struct bio *bio) |
| 1069 | { |
| 1070 | int r; |
Mike Snitzer | c3a0ce2 | 2012-05-12 01:43:16 +0100 | [diff] [blame] | 1071 | unsigned long flags; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1072 | struct pool *pool = tc->pool; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1073 | struct dm_bio_prison_cell *cell, *cell2; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1074 | struct dm_cell_key key, key2; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1075 | dm_block_t block = get_bio_block(tc, bio); |
| 1076 | struct dm_thin_lookup_result lookup_result; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1077 | struct dm_thin_new_mapping *m; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1078 | |
| 1079 | build_virtual_key(tc->td, block, &key); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1080 | if (bio_detain(tc->pool, &key, bio, &cell)) |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1081 | return; |
| 1082 | |
| 1083 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); |
| 1084 | switch (r) { |
| 1085 | case 0: |
| 1086 | /* |
| 1087 | * Check nobody is fiddling with this pool block. This can |
| 1088 | * happen if someone's in the process of breaking sharing |
| 1089 | * on this block. |
| 1090 | */ |
| 1091 | build_data_key(tc->td, lookup_result.block, &key2); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1092 | if (bio_detain(tc->pool, &key2, bio, &cell2)) { |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1093 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1094 | break; |
| 1095 | } |
| 1096 | |
| 1097 | if (io_overlaps_block(pool, bio)) { |
| 1098 | /* |
| 1099 | * IO may still be going to the destination block. We must |
| 1100 | * quiesce before we can do the removal. |
| 1101 | */ |
| 1102 | m = get_next_mapping(pool); |
| 1103 | m->tc = tc; |
Joe Thornber | 19fa1a6 | 2013-12-17 12:09:40 -0500 | [diff] [blame] | 1104 | m->pass_discard = pool->pf.discard_passdown; |
| 1105 | m->definitely_not_shared = !lookup_result.shared; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1106 | m->virt_block = block; |
| 1107 | m->data_block = lookup_result.block; |
| 1108 | m->cell = cell; |
| 1109 | m->cell2 = cell2; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1110 | m->bio = bio; |
| 1111 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1112 | if (!dm_deferred_set_add_work(pool->all_io_ds, &m->list)) { |
Mike Snitzer | c3a0ce2 | 2012-05-12 01:43:16 +0100 | [diff] [blame] | 1113 | spin_lock_irqsave(&pool->lock, flags); |
Mike Snitzer | daec338 | 2013-12-11 14:01:20 -0500 | [diff] [blame] | 1114 | list_add_tail(&m->list, &pool->prepared_discards); |
Mike Snitzer | c3a0ce2 | 2012-05-12 01:43:16 +0100 | [diff] [blame] | 1115 | spin_unlock_irqrestore(&pool->lock, flags); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1116 | wake_worker(pool); |
| 1117 | } |
| 1118 | } else { |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1119 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1120 | cell_defer_no_holder(tc, cell); |
| 1121 | cell_defer_no_holder(tc, cell2); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1122 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1123 | /* |
Mikulas Patocka | 4929630 | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 1124 | * The DM core makes sure that the discard doesn't span |
| 1125 | * a block boundary. So we submit the discard of a |
| 1126 | * partial block appropriately. |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1127 | */ |
Mikulas Patocka | 650d2a0 | 2012-07-20 14:25:05 +0100 | [diff] [blame] | 1128 | if ((!lookup_result.shared) && pool->pf.discard_passdown) |
| 1129 | remap_and_issue(tc, bio, lookup_result.block); |
| 1130 | else |
| 1131 | bio_endio(bio, 0); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1132 | } |
| 1133 | break; |
| 1134 | |
| 1135 | case -ENODATA: |
| 1136 | /* |
| 1137 | * It isn't provisioned, just forget it. |
| 1138 | */ |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1139 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1140 | bio_endio(bio, 0); |
| 1141 | break; |
| 1142 | |
| 1143 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1144 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
| 1145 | __func__, r); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1146 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1147 | bio_io_error(bio); |
| 1148 | break; |
| 1149 | } |
| 1150 | } |
| 1151 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1152 | 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] | 1153 | struct dm_cell_key *key, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1154 | struct dm_thin_lookup_result *lookup_result, |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1155 | struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1156 | { |
| 1157 | int r; |
| 1158 | dm_block_t data_block; |
Mike Snitzer | d6fc204 | 2013-08-21 17:40:11 -0400 | [diff] [blame] | 1159 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1160 | |
| 1161 | r = alloc_data_block(tc, &data_block); |
| 1162 | switch (r) { |
| 1163 | case 0: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1164 | schedule_internal_copy(tc, block, lookup_result->block, |
| 1165 | data_block, cell, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1166 | break; |
| 1167 | |
| 1168 | case -ENOSPC: |
Mike Snitzer | 399cadd | 2013-12-05 16:03:33 -0500 | [diff] [blame] | 1169 | retry_bios_on_resume(pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1170 | break; |
| 1171 | |
| 1172 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1173 | DMERR_LIMIT("%s: alloc_data_block() failed: error = %d", |
| 1174 | __func__, r); |
Mike Snitzer | d6fc204 | 2013-08-21 17:40:11 -0400 | [diff] [blame] | 1175 | cell_error(pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1176 | break; |
| 1177 | } |
| 1178 | } |
| 1179 | |
| 1180 | static void process_shared_bio(struct thin_c *tc, struct bio *bio, |
| 1181 | dm_block_t block, |
| 1182 | struct dm_thin_lookup_result *lookup_result) |
| 1183 | { |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1184 | struct dm_bio_prison_cell *cell; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1185 | struct pool *pool = tc->pool; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1186 | struct dm_cell_key key; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1187 | |
| 1188 | /* |
| 1189 | * If cell is already occupied, then sharing is already in the process |
| 1190 | * of being broken so we have nothing further to do here. |
| 1191 | */ |
| 1192 | build_data_key(tc->td, lookup_result->block, &key); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1193 | if (bio_detain(pool, &key, bio, &cell)) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1194 | return; |
| 1195 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1196 | if (bio_data_dir(bio) == WRITE && bio->bi_iter.bi_size) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1197 | break_sharing(tc, bio, block, &key, lookup_result, cell); |
| 1198 | else { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1199 | 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] | 1200 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1201 | h->shared_read_entry = dm_deferred_entry_inc(pool->shared_read_ds); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1202 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1203 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1204 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1205 | remap_and_issue(tc, bio, lookup_result->block); |
| 1206 | } |
| 1207 | } |
| 1208 | |
| 1209 | 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] | 1210 | struct dm_bio_prison_cell *cell) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1211 | { |
| 1212 | int r; |
| 1213 | dm_block_t data_block; |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1214 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1215 | |
| 1216 | /* |
| 1217 | * Remap empty bios (flushes) immediately, without provisioning. |
| 1218 | */ |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1219 | if (!bio->bi_iter.bi_size) { |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1220 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1221 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1222 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1223 | remap_and_issue(tc, bio, 0); |
| 1224 | return; |
| 1225 | } |
| 1226 | |
| 1227 | /* |
| 1228 | * Fill read bios with zeroes and complete them immediately. |
| 1229 | */ |
| 1230 | if (bio_data_dir(bio) == READ) { |
| 1231 | zero_fill_bio(bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1232 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1233 | bio_endio(bio, 0); |
| 1234 | return; |
| 1235 | } |
| 1236 | |
| 1237 | r = alloc_data_block(tc, &data_block); |
| 1238 | switch (r) { |
| 1239 | case 0: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1240 | if (tc->origin_dev) |
| 1241 | schedule_external_copy(tc, block, data_block, cell, bio); |
| 1242 | else |
| 1243 | schedule_zero(tc, block, data_block, cell, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1244 | break; |
| 1245 | |
| 1246 | case -ENOSPC: |
Mike Snitzer | 399cadd | 2013-12-05 16:03:33 -0500 | [diff] [blame] | 1247 | retry_bios_on_resume(pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1248 | break; |
| 1249 | |
| 1250 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1251 | DMERR_LIMIT("%s: alloc_data_block() failed: error = %d", |
| 1252 | __func__, r); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1253 | cell_error(pool, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1254 | break; |
| 1255 | } |
| 1256 | } |
| 1257 | |
| 1258 | static void process_bio(struct thin_c *tc, struct bio *bio) |
| 1259 | { |
| 1260 | int r; |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1261 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1262 | dm_block_t block = get_bio_block(tc, bio); |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1263 | struct dm_bio_prison_cell *cell; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1264 | struct dm_cell_key key; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1265 | struct dm_thin_lookup_result lookup_result; |
| 1266 | |
| 1267 | /* |
| 1268 | * If cell is already occupied, then the block is already |
| 1269 | * being provisioned so we have nothing further to do here. |
| 1270 | */ |
| 1271 | build_virtual_key(tc->td, block, &key); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1272 | if (bio_detain(pool, &key, bio, &cell)) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1273 | return; |
| 1274 | |
| 1275 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); |
| 1276 | switch (r) { |
| 1277 | case 0: |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1278 | if (lookup_result.shared) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1279 | process_shared_bio(tc, bio, block, &lookup_result); |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1280 | cell_defer_no_holder(tc, cell); /* FIXME: pass this cell into process_shared? */ |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1281 | } else { |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1282 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1283 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1284 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1285 | remap_and_issue(tc, bio, lookup_result.block); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1286 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1287 | break; |
| 1288 | |
| 1289 | case -ENODATA: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1290 | if (bio_data_dir(bio) == READ && tc->origin_dev) { |
Joe Thornber | 6beca5e | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1291 | inc_all_io_entry(pool, bio); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1292 | cell_defer_no_holder(tc, cell); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1293 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1294 | remap_to_origin_and_issue(tc, bio); |
| 1295 | } else |
| 1296 | provision_block(tc, bio, block, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1297 | break; |
| 1298 | |
| 1299 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1300 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
| 1301 | __func__, r); |
Joe Thornber | f286ba0 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1302 | cell_defer_no_holder(tc, cell); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1303 | bio_io_error(bio); |
| 1304 | break; |
| 1305 | } |
| 1306 | } |
| 1307 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1308 | static void process_bio_read_only(struct thin_c *tc, struct bio *bio) |
| 1309 | { |
| 1310 | int r; |
| 1311 | int rw = bio_data_dir(bio); |
| 1312 | dm_block_t block = get_bio_block(tc, bio); |
| 1313 | struct dm_thin_lookup_result lookup_result; |
| 1314 | |
| 1315 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); |
| 1316 | switch (r) { |
| 1317 | case 0: |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1318 | if (lookup_result.shared && (rw == WRITE) && bio->bi_iter.bi_size) |
Mike Snitzer | 8c0f0e8 | 2013-12-05 15:47:24 -0500 | [diff] [blame] | 1319 | handle_unserviceable_bio(tc->pool, bio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1320 | else { |
| 1321 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1322 | remap_and_issue(tc, bio, lookup_result.block); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1323 | } |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1324 | break; |
| 1325 | |
| 1326 | case -ENODATA: |
| 1327 | if (rw != READ) { |
Mike Snitzer | 8c0f0e8 | 2013-12-05 15:47:24 -0500 | [diff] [blame] | 1328 | handle_unserviceable_bio(tc->pool, bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1329 | break; |
| 1330 | } |
| 1331 | |
| 1332 | if (tc->origin_dev) { |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1333 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1334 | remap_to_origin_and_issue(tc, bio); |
| 1335 | break; |
| 1336 | } |
| 1337 | |
| 1338 | zero_fill_bio(bio); |
| 1339 | bio_endio(bio, 0); |
| 1340 | break; |
| 1341 | |
| 1342 | default: |
Mike Snitzer | c397741 | 2012-12-21 20:23:34 +0000 | [diff] [blame] | 1343 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
| 1344 | __func__, r); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1345 | bio_io_error(bio); |
| 1346 | break; |
| 1347 | } |
| 1348 | } |
| 1349 | |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 1350 | static void process_bio_success(struct thin_c *tc, struct bio *bio) |
| 1351 | { |
| 1352 | bio_endio(bio, 0); |
| 1353 | } |
| 1354 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1355 | static void process_bio_fail(struct thin_c *tc, struct bio *bio) |
| 1356 | { |
| 1357 | bio_io_error(bio); |
| 1358 | } |
| 1359 | |
Joe Thornber | ac8c3f3 | 2013-05-10 14:37:21 +0100 | [diff] [blame] | 1360 | /* |
| 1361 | * FIXME: should we also commit due to size of transaction, measured in |
| 1362 | * metadata blocks? |
| 1363 | */ |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1364 | static int need_commit_due_to_time(struct pool *pool) |
| 1365 | { |
| 1366 | return jiffies < pool->last_commit_jiffies || |
| 1367 | jiffies > pool->last_commit_jiffies + COMMIT_PERIOD; |
| 1368 | } |
| 1369 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1370 | static void process_thin_deferred_bios(struct thin_c *tc) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1371 | { |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1372 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1373 | unsigned long flags; |
| 1374 | struct bio *bio; |
| 1375 | struct bio_list bios; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1376 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1377 | if (tc->requeue_mode) { |
| 1378 | requeue_bio_list(tc, &tc->deferred_bio_list); |
| 1379 | return; |
| 1380 | } |
| 1381 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1382 | bio_list_init(&bios); |
| 1383 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1384 | spin_lock_irqsave(&tc->lock, flags); |
| 1385 | bio_list_merge(&bios, &tc->deferred_bio_list); |
| 1386 | bio_list_init(&tc->deferred_bio_list); |
| 1387 | spin_unlock_irqrestore(&tc->lock, flags); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1388 | |
| 1389 | while ((bio = bio_list_pop(&bios))) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1390 | /* |
| 1391 | * If we've got no free new_mapping structs, and processing |
| 1392 | * this bio might require one, we pause until there are some |
| 1393 | * prepared mappings to process. |
| 1394 | */ |
| 1395 | if (ensure_next_mapping(pool)) { |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1396 | spin_lock_irqsave(&tc->lock, flags); |
| 1397 | bio_list_add(&tc->deferred_bio_list, bio); |
| 1398 | bio_list_merge(&tc->deferred_bio_list, &bios); |
| 1399 | spin_unlock_irqrestore(&tc->lock, flags); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1400 | break; |
| 1401 | } |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1402 | |
| 1403 | if (bio->bi_rw & REQ_DISCARD) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1404 | pool->process_discard(tc, bio); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1405 | else |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1406 | pool->process_bio(tc, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1407 | } |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1408 | } |
| 1409 | |
| 1410 | static void process_deferred_bios(struct pool *pool) |
| 1411 | { |
| 1412 | unsigned long flags; |
| 1413 | struct bio *bio; |
| 1414 | struct bio_list bios; |
| 1415 | struct thin_c *tc; |
| 1416 | |
| 1417 | rcu_read_lock(); |
| 1418 | list_for_each_entry_rcu(tc, &pool->active_thins, list) |
| 1419 | process_thin_deferred_bios(tc); |
| 1420 | rcu_read_unlock(); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1421 | |
| 1422 | /* |
| 1423 | * If there are any deferred flush bios, we must commit |
| 1424 | * the metadata before issuing them. |
| 1425 | */ |
| 1426 | bio_list_init(&bios); |
| 1427 | spin_lock_irqsave(&pool->lock, flags); |
| 1428 | bio_list_merge(&bios, &pool->deferred_flush_bios); |
| 1429 | bio_list_init(&pool->deferred_flush_bios); |
| 1430 | spin_unlock_irqrestore(&pool->lock, flags); |
| 1431 | |
Mike Snitzer | 4d1662a | 2014-02-06 06:08:56 -0500 | [diff] [blame] | 1432 | if (bio_list_empty(&bios) && |
| 1433 | !(dm_pool_changed_this_transaction(pool->pmd) && need_commit_due_to_time(pool))) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1434 | return; |
| 1435 | |
Joe Thornber | 020cc3b | 2013-12-04 15:05:36 -0500 | [diff] [blame] | 1436 | if (commit(pool)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1437 | while ((bio = bio_list_pop(&bios))) |
| 1438 | bio_io_error(bio); |
| 1439 | return; |
| 1440 | } |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1441 | pool->last_commit_jiffies = jiffies; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1442 | |
| 1443 | while ((bio = bio_list_pop(&bios))) |
| 1444 | generic_make_request(bio); |
| 1445 | } |
| 1446 | |
| 1447 | static void do_worker(struct work_struct *ws) |
| 1448 | { |
| 1449 | struct pool *pool = container_of(ws, struct pool, worker); |
| 1450 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1451 | process_prepared(pool, &pool->prepared_mappings, &pool->process_prepared_mapping); |
| 1452 | process_prepared(pool, &pool->prepared_discards, &pool->process_prepared_discard); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1453 | process_deferred_bios(pool); |
| 1454 | } |
| 1455 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1456 | /* |
| 1457 | * We want to commit periodically so that not too much |
| 1458 | * unwritten data builds up. |
| 1459 | */ |
| 1460 | static void do_waker(struct work_struct *ws) |
| 1461 | { |
| 1462 | struct pool *pool = container_of(to_delayed_work(ws), struct pool, waker); |
| 1463 | wake_worker(pool); |
| 1464 | queue_delayed_work(pool->wq, &pool->waker, COMMIT_PERIOD); |
| 1465 | } |
| 1466 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1467 | /*----------------------------------------------------------------*/ |
| 1468 | |
Joe Thornber | 738211f | 2014-03-03 15:52:28 +0000 | [diff] [blame] | 1469 | struct noflush_work { |
| 1470 | struct work_struct worker; |
| 1471 | struct thin_c *tc; |
| 1472 | |
| 1473 | atomic_t complete; |
| 1474 | wait_queue_head_t wait; |
| 1475 | }; |
| 1476 | |
| 1477 | static void complete_noflush_work(struct noflush_work *w) |
| 1478 | { |
| 1479 | atomic_set(&w->complete, 1); |
| 1480 | wake_up(&w->wait); |
| 1481 | } |
| 1482 | |
| 1483 | static void do_noflush_start(struct work_struct *ws) |
| 1484 | { |
| 1485 | struct noflush_work *w = container_of(ws, struct noflush_work, worker); |
| 1486 | w->tc->requeue_mode = true; |
| 1487 | requeue_io(w->tc); |
| 1488 | complete_noflush_work(w); |
| 1489 | } |
| 1490 | |
| 1491 | static void do_noflush_stop(struct work_struct *ws) |
| 1492 | { |
| 1493 | struct noflush_work *w = container_of(ws, struct noflush_work, worker); |
| 1494 | w->tc->requeue_mode = false; |
| 1495 | complete_noflush_work(w); |
| 1496 | } |
| 1497 | |
| 1498 | static void noflush_work(struct thin_c *tc, void (*fn)(struct work_struct *)) |
| 1499 | { |
| 1500 | struct noflush_work w; |
| 1501 | |
| 1502 | INIT_WORK(&w.worker, fn); |
| 1503 | w.tc = tc; |
| 1504 | atomic_set(&w.complete, 0); |
| 1505 | init_waitqueue_head(&w.wait); |
| 1506 | |
| 1507 | queue_work(tc->pool->wq, &w.worker); |
| 1508 | |
| 1509 | wait_event(w.wait, atomic_read(&w.complete)); |
| 1510 | } |
| 1511 | |
| 1512 | /*----------------------------------------------------------------*/ |
| 1513 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1514 | static enum pool_mode get_pool_mode(struct pool *pool) |
| 1515 | { |
| 1516 | return pool->pf.mode; |
| 1517 | } |
| 1518 | |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 1519 | static void notify_of_pool_mode_change(struct pool *pool, const char *new_mode) |
| 1520 | { |
| 1521 | dm_table_event(pool->ti->table); |
| 1522 | DMINFO("%s: switching pool to %s mode", |
| 1523 | dm_device_name(pool->pool_md), new_mode); |
| 1524 | } |
| 1525 | |
Mike Snitzer | 8b64e88 | 2013-12-20 14:27:28 -0500 | [diff] [blame] | 1526 | static void set_pool_mode(struct pool *pool, enum pool_mode new_mode) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1527 | { |
Mike Snitzer | cdc2b41 | 2014-02-14 18:10:55 -0500 | [diff] [blame] | 1528 | struct pool_c *pt = pool->ti->private; |
Mike Snitzer | 07f2b6e | 2014-02-14 11:58:41 -0500 | [diff] [blame] | 1529 | bool needs_check = dm_pool_metadata_needs_check(pool->pmd); |
| 1530 | enum pool_mode old_mode = get_pool_mode(pool); |
| 1531 | |
| 1532 | /* |
| 1533 | * Never allow the pool to transition to PM_WRITE mode if user |
| 1534 | * intervention is required to verify metadata and data consistency. |
| 1535 | */ |
| 1536 | if (new_mode == PM_WRITE && needs_check) { |
| 1537 | DMERR("%s: unable to switch pool to write mode until repaired.", |
| 1538 | dm_device_name(pool->pool_md)); |
| 1539 | if (old_mode != new_mode) |
| 1540 | new_mode = old_mode; |
| 1541 | else |
| 1542 | new_mode = PM_READ_ONLY; |
| 1543 | } |
| 1544 | /* |
| 1545 | * If we were in PM_FAIL mode, rollback of metadata failed. We're |
| 1546 | * not going to recover without a thin_repair. So we never let the |
| 1547 | * pool move out of the old mode. |
| 1548 | */ |
| 1549 | if (old_mode == PM_FAIL) |
| 1550 | new_mode = old_mode; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1551 | |
Mike Snitzer | 8b64e88 | 2013-12-20 14:27:28 -0500 | [diff] [blame] | 1552 | switch (new_mode) { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1553 | case PM_FAIL: |
Mike Snitzer | 8b64e88 | 2013-12-20 14:27:28 -0500 | [diff] [blame] | 1554 | if (old_mode != new_mode) |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 1555 | notify_of_pool_mode_change(pool, "failure"); |
Joe Thornber | 5383ef3 | 2013-12-04 16:30:01 -0500 | [diff] [blame] | 1556 | dm_pool_metadata_read_only(pool->pmd); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1557 | pool->process_bio = process_bio_fail; |
| 1558 | pool->process_discard = process_bio_fail; |
| 1559 | pool->process_prepared_mapping = process_prepared_mapping_fail; |
| 1560 | pool->process_prepared_discard = process_prepared_discard_fail; |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 1561 | |
| 1562 | error_retry_list(pool); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1563 | break; |
| 1564 | |
| 1565 | case PM_READ_ONLY: |
Mike Snitzer | 8b64e88 | 2013-12-20 14:27:28 -0500 | [diff] [blame] | 1566 | if (old_mode != new_mode) |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 1567 | notify_of_pool_mode_change(pool, "read-only"); |
| 1568 | dm_pool_metadata_read_only(pool->pmd); |
| 1569 | pool->process_bio = process_bio_read_only; |
| 1570 | pool->process_discard = process_bio_success; |
| 1571 | pool->process_prepared_mapping = process_prepared_mapping_fail; |
| 1572 | pool->process_prepared_discard = process_prepared_discard_passdown; |
| 1573 | |
| 1574 | error_retry_list(pool); |
| 1575 | break; |
| 1576 | |
| 1577 | case PM_OUT_OF_DATA_SPACE: |
| 1578 | /* |
| 1579 | * Ideally we'd never hit this state; the low water mark |
| 1580 | * would trigger userland to extend the pool before we |
| 1581 | * completely run out of data space. However, many small |
| 1582 | * IOs to unprovisioned space can consume data space at an |
| 1583 | * alarming rate. Adjust your low water mark if you're |
| 1584 | * frequently seeing this mode. |
| 1585 | */ |
| 1586 | if (old_mode != new_mode) |
| 1587 | notify_of_pool_mode_change(pool, "out-of-data-space"); |
| 1588 | pool->process_bio = process_bio_read_only; |
| 1589 | pool->process_discard = process_discard; |
| 1590 | pool->process_prepared_mapping = process_prepared_mapping; |
| 1591 | pool->process_prepared_discard = process_prepared_discard_passdown; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1592 | break; |
| 1593 | |
| 1594 | case PM_WRITE: |
Mike Snitzer | 8b64e88 | 2013-12-20 14:27:28 -0500 | [diff] [blame] | 1595 | if (old_mode != new_mode) |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 1596 | notify_of_pool_mode_change(pool, "write"); |
Joe Thornber | 9b7aaa6 | 2013-12-04 16:58:19 -0500 | [diff] [blame] | 1597 | dm_pool_metadata_read_write(pool->pmd); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1598 | pool->process_bio = process_bio; |
| 1599 | pool->process_discard = process_discard; |
| 1600 | pool->process_prepared_mapping = process_prepared_mapping; |
| 1601 | pool->process_prepared_discard = process_prepared_discard; |
| 1602 | break; |
| 1603 | } |
Mike Snitzer | 8b64e88 | 2013-12-20 14:27:28 -0500 | [diff] [blame] | 1604 | |
| 1605 | pool->pf.mode = new_mode; |
Mike Snitzer | cdc2b41 | 2014-02-14 18:10:55 -0500 | [diff] [blame] | 1606 | /* |
| 1607 | * The pool mode may have changed, sync it so bind_control_target() |
| 1608 | * doesn't cause an unexpected mode transition on resume. |
| 1609 | */ |
| 1610 | pt->adjusted_pf.mode = new_mode; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1611 | } |
| 1612 | |
Mike Snitzer | 07f2b6e | 2014-02-14 11:58:41 -0500 | [diff] [blame] | 1613 | static void abort_transaction(struct pool *pool) |
| 1614 | { |
| 1615 | const char *dev_name = dm_device_name(pool->pool_md); |
| 1616 | |
| 1617 | DMERR_LIMIT("%s: aborting current metadata transaction", dev_name); |
| 1618 | if (dm_pool_abort_metadata(pool->pmd)) { |
| 1619 | DMERR("%s: failed to abort metadata transaction", dev_name); |
| 1620 | set_pool_mode(pool, PM_FAIL); |
| 1621 | } |
| 1622 | |
| 1623 | if (dm_pool_metadata_set_needs_check(pool->pmd)) { |
| 1624 | DMERR("%s: failed to set 'needs_check' flag in metadata", dev_name); |
| 1625 | set_pool_mode(pool, PM_FAIL); |
| 1626 | } |
| 1627 | } |
| 1628 | |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 1629 | static void metadata_operation_failed(struct pool *pool, const char *op, int r) |
| 1630 | { |
| 1631 | DMERR_LIMIT("%s: metadata operation '%s' failed: error = %d", |
| 1632 | dm_device_name(pool->pool_md), op, r); |
| 1633 | |
Mike Snitzer | 07f2b6e | 2014-02-14 11:58:41 -0500 | [diff] [blame] | 1634 | abort_transaction(pool); |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 1635 | set_pool_mode(pool, PM_READ_ONLY); |
| 1636 | } |
| 1637 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1638 | /*----------------------------------------------------------------*/ |
| 1639 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1640 | /* |
| 1641 | * Mapping functions. |
| 1642 | */ |
| 1643 | |
| 1644 | /* |
| 1645 | * Called only while mapping a thin bio to hand it over to the workqueue. |
| 1646 | */ |
| 1647 | static void thin_defer_bio(struct thin_c *tc, struct bio *bio) |
| 1648 | { |
| 1649 | unsigned long flags; |
| 1650 | struct pool *pool = tc->pool; |
| 1651 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1652 | spin_lock_irqsave(&tc->lock, flags); |
| 1653 | bio_list_add(&tc->deferred_bio_list, bio); |
| 1654 | spin_unlock_irqrestore(&tc->lock, flags); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1655 | |
| 1656 | wake_worker(pool); |
| 1657 | } |
| 1658 | |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1659 | static void thin_hook_bio(struct thin_c *tc, struct bio *bio) |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1660 | { |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1661 | 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] | 1662 | |
| 1663 | h->tc = tc; |
| 1664 | h->shared_read_entry = NULL; |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1665 | h->all_io_entry = NULL; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1666 | h->overwrite_mapping = NULL; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1667 | } |
| 1668 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1669 | /* |
| 1670 | * Non-blocking function called from the thin target's map function. |
| 1671 | */ |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 1672 | static int thin_bio_map(struct dm_target *ti, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1673 | { |
| 1674 | int r; |
| 1675 | struct thin_c *tc = ti->private; |
| 1676 | dm_block_t block = get_bio_block(tc, bio); |
| 1677 | struct dm_thin_device *td = tc->td; |
| 1678 | struct dm_thin_lookup_result result; |
Joe Thornber | 025b968 | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1679 | struct dm_bio_prison_cell cell1, cell2; |
| 1680 | struct dm_bio_prison_cell *cell_result; |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1681 | struct dm_cell_key key; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1682 | |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 1683 | thin_hook_bio(tc, bio); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1684 | |
Joe Thornber | 738211f | 2014-03-03 15:52:28 +0000 | [diff] [blame] | 1685 | if (tc->requeue_mode) { |
| 1686 | bio_endio(bio, DM_ENDIO_REQUEUE); |
| 1687 | return DM_MAPIO_SUBMITTED; |
| 1688 | } |
| 1689 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1690 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
| 1691 | bio_io_error(bio); |
| 1692 | return DM_MAPIO_SUBMITTED; |
| 1693 | } |
| 1694 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1695 | if (bio->bi_rw & (REQ_DISCARD | REQ_FLUSH | REQ_FUA)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1696 | thin_defer_bio(tc, bio); |
| 1697 | return DM_MAPIO_SUBMITTED; |
| 1698 | } |
| 1699 | |
| 1700 | r = dm_thin_find_block(td, block, 0, &result); |
| 1701 | |
| 1702 | /* |
| 1703 | * Note that we defer readahead too. |
| 1704 | */ |
| 1705 | switch (r) { |
| 1706 | case 0: |
| 1707 | if (unlikely(result.shared)) { |
| 1708 | /* |
| 1709 | * We have a race condition here between the |
| 1710 | * result.shared value returned by the lookup and |
| 1711 | * snapshot creation, which may cause new |
| 1712 | * sharing. |
| 1713 | * |
| 1714 | * To avoid this always quiesce the origin before |
| 1715 | * taking the snap. You want to do this anyway to |
| 1716 | * ensure a consistent application view |
| 1717 | * (i.e. lockfs). |
| 1718 | * |
| 1719 | * More distant ancestors are irrelevant. The |
| 1720 | * shared flag will be set in their case. |
| 1721 | */ |
| 1722 | thin_defer_bio(tc, bio); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1723 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1724 | } |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1725 | |
| 1726 | build_virtual_key(tc->td, block, &key); |
Joe Thornber | 025b968 | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1727 | if (dm_bio_detain(tc->pool->prison, &key, bio, &cell1, &cell_result)) |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1728 | return DM_MAPIO_SUBMITTED; |
| 1729 | |
| 1730 | build_data_key(tc->td, result.block, &key); |
Joe Thornber | 025b968 | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1731 | if (dm_bio_detain(tc->pool->prison, &key, bio, &cell2, &cell_result)) { |
| 1732 | cell_defer_no_holder_no_free(tc, &cell1); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1733 | return DM_MAPIO_SUBMITTED; |
| 1734 | } |
| 1735 | |
| 1736 | inc_all_io_entry(tc->pool, bio); |
Joe Thornber | 025b968 | 2013-03-01 22:45:50 +0000 | [diff] [blame] | 1737 | cell_defer_no_holder_no_free(tc, &cell2); |
| 1738 | cell_defer_no_holder_no_free(tc, &cell1); |
Joe Thornber | e808807 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 1739 | |
| 1740 | remap(tc, bio, result.block); |
| 1741 | return DM_MAPIO_REMAPPED; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1742 | |
| 1743 | case -ENODATA: |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1744 | if (get_pool_mode(tc->pool) == PM_READ_ONLY) { |
| 1745 | /* |
| 1746 | * This block isn't provisioned, and we have no way |
Mike Snitzer | 8c0f0e8 | 2013-12-05 15:47:24 -0500 | [diff] [blame] | 1747 | * of doing so. |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1748 | */ |
Mike Snitzer | 8c0f0e8 | 2013-12-05 15:47:24 -0500 | [diff] [blame] | 1749 | handle_unserviceable_bio(tc->pool, bio); |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1750 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1751 | } |
| 1752 | /* fall through */ |
| 1753 | |
| 1754 | case -EWOULDBLOCK: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1755 | /* |
| 1756 | * In future, the failed dm_thin_find_block above could |
| 1757 | * provide the hint to load the metadata into cache. |
| 1758 | */ |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1759 | thin_defer_bio(tc, bio); |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1760 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1761 | |
| 1762 | default: |
| 1763 | /* |
| 1764 | * Must always call bio_io_error on failure. |
| 1765 | * dm_thin_find_block can fail with -EINVAL if the |
| 1766 | * pool is switched to fail-io mode. |
| 1767 | */ |
| 1768 | bio_io_error(bio); |
Joe Thornber | 2aab385 | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 1769 | return DM_MAPIO_SUBMITTED; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1770 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1771 | } |
| 1772 | |
| 1773 | static int pool_is_congested(struct dm_target_callbacks *cb, int bdi_bits) |
| 1774 | { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1775 | struct pool_c *pt = container_of(cb, struct pool_c, callbacks); |
Mike Snitzer | 760fe67 | 2014-03-20 08:36:47 -0400 | [diff] [blame] | 1776 | struct request_queue *q; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1777 | |
Mike Snitzer | 760fe67 | 2014-03-20 08:36:47 -0400 | [diff] [blame] | 1778 | if (get_pool_mode(pt->pool) == PM_OUT_OF_DATA_SPACE) |
| 1779 | return 1; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1780 | |
Mike Snitzer | 760fe67 | 2014-03-20 08:36:47 -0400 | [diff] [blame] | 1781 | q = bdev_get_queue(pt->data_dev->bdev); |
| 1782 | return bdi_congested(&q->backing_dev_info, bdi_bits); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1783 | } |
| 1784 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1785 | static void requeue_bios(struct pool *pool) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1786 | { |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1787 | unsigned long flags; |
| 1788 | struct thin_c *tc; |
| 1789 | |
| 1790 | rcu_read_lock(); |
| 1791 | list_for_each_entry_rcu(tc, &pool->active_thins, list) { |
| 1792 | spin_lock_irqsave(&tc->lock, flags); |
| 1793 | bio_list_merge(&tc->deferred_bio_list, &tc->retry_on_resume_list); |
| 1794 | bio_list_init(&tc->retry_on_resume_list); |
| 1795 | spin_unlock_irqrestore(&tc->lock, flags); |
| 1796 | } |
| 1797 | rcu_read_unlock(); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1798 | } |
| 1799 | |
| 1800 | /*---------------------------------------------------------------- |
| 1801 | * Binding of control targets to a pool object |
| 1802 | *--------------------------------------------------------------*/ |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1803 | static bool data_dev_supports_discard(struct pool_c *pt) |
| 1804 | { |
| 1805 | struct request_queue *q = bdev_get_queue(pt->data_dev->bdev); |
| 1806 | |
| 1807 | return q && blk_queue_discard(q); |
| 1808 | } |
| 1809 | |
Joe Thornber | 58051b9 | 2013-03-20 17:21:25 +0000 | [diff] [blame] | 1810 | static bool is_factor(sector_t block_size, uint32_t n) |
| 1811 | { |
| 1812 | return !sector_div(block_size, n); |
| 1813 | } |
| 1814 | |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1815 | /* |
| 1816 | * If discard_passdown was enabled verify that the data device |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1817 | * supports discards. Disable discard_passdown if not. |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1818 | */ |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1819 | static void disable_passdown_if_not_supported(struct pool_c *pt) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1820 | { |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1821 | struct pool *pool = pt->pool; |
| 1822 | struct block_device *data_bdev = pt->data_dev->bdev; |
| 1823 | struct queue_limits *data_limits = &bdev_get_queue(data_bdev)->limits; |
| 1824 | sector_t block_size = pool->sectors_per_block << SECTOR_SHIFT; |
| 1825 | const char *reason = NULL; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1826 | char buf[BDEVNAME_SIZE]; |
| 1827 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1828 | if (!pt->adjusted_pf.discard_passdown) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1829 | return; |
| 1830 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1831 | if (!data_dev_supports_discard(pt)) |
| 1832 | reason = "discard unsupported"; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1833 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1834 | else if (data_limits->max_discard_sectors < pool->sectors_per_block) |
| 1835 | reason = "max discard sectors smaller than a block"; |
| 1836 | |
| 1837 | else if (data_limits->discard_granularity > block_size) |
| 1838 | reason = "discard granularity larger than a block"; |
| 1839 | |
Joe Thornber | 58051b9 | 2013-03-20 17:21:25 +0000 | [diff] [blame] | 1840 | else if (!is_factor(block_size, data_limits->discard_granularity)) |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1841 | reason = "discard granularity not a factor of block size"; |
| 1842 | |
| 1843 | if (reason) { |
| 1844 | DMWARN("Data device (%s) %s: Disabling discard passdown.", bdevname(data_bdev, buf), reason); |
| 1845 | pt->adjusted_pf.discard_passdown = false; |
| 1846 | } |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1847 | } |
| 1848 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1849 | static int bind_control_target(struct pool *pool, struct dm_target *ti) |
| 1850 | { |
| 1851 | struct pool_c *pt = ti->private; |
| 1852 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1853 | /* |
Joe Thornber | 9b7aaa6 | 2013-12-04 16:58:19 -0500 | [diff] [blame] | 1854 | * We want to make sure that a pool in PM_FAIL mode is never upgraded. |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1855 | */ |
Mike Snitzer | 07f2b6e | 2014-02-14 11:58:41 -0500 | [diff] [blame] | 1856 | enum pool_mode old_mode = get_pool_mode(pool); |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 1857 | enum pool_mode new_mode = pt->adjusted_pf.mode; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1858 | |
Joe Thornber | 9b7aaa6 | 2013-12-04 16:58:19 -0500 | [diff] [blame] | 1859 | /* |
Mike Snitzer | 8b64e88 | 2013-12-20 14:27:28 -0500 | [diff] [blame] | 1860 | * Don't change the pool's mode until set_pool_mode() below. |
| 1861 | * Otherwise the pool's process_* function pointers may |
| 1862 | * not match the desired pool mode. |
| 1863 | */ |
| 1864 | pt->adjusted_pf.mode = old_mode; |
| 1865 | |
| 1866 | pool->ti = ti; |
| 1867 | pool->pf = pt->adjusted_pf; |
| 1868 | pool->low_water_blocks = pt->low_water_blocks; |
| 1869 | |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1870 | set_pool_mode(pool, new_mode); |
Mike Snitzer | f402693 | 2012-05-19 01:01:01 +0100 | [diff] [blame] | 1871 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1872 | return 0; |
| 1873 | } |
| 1874 | |
| 1875 | static void unbind_control_target(struct pool *pool, struct dm_target *ti) |
| 1876 | { |
| 1877 | if (pool->ti == ti) |
| 1878 | pool->ti = NULL; |
| 1879 | } |
| 1880 | |
| 1881 | /*---------------------------------------------------------------- |
| 1882 | * Pool creation |
| 1883 | *--------------------------------------------------------------*/ |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1884 | /* Initialize pool features. */ |
| 1885 | static void pool_features_init(struct pool_features *pf) |
| 1886 | { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1887 | pf->mode = PM_WRITE; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 1888 | pf->zero_new_blocks = true; |
| 1889 | pf->discard_enabled = true; |
| 1890 | pf->discard_passdown = true; |
Mike Snitzer | 787a996c | 2013-12-06 16:21:43 -0500 | [diff] [blame] | 1891 | pf->error_if_no_space = false; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1892 | } |
| 1893 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1894 | static void __pool_destroy(struct pool *pool) |
| 1895 | { |
| 1896 | __pool_table_remove(pool); |
| 1897 | |
| 1898 | if (dm_pool_metadata_close(pool->pmd) < 0) |
| 1899 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); |
| 1900 | |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1901 | dm_bio_prison_destroy(pool->prison); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1902 | dm_kcopyd_client_destroy(pool->copier); |
| 1903 | |
| 1904 | if (pool->wq) |
| 1905 | destroy_workqueue(pool->wq); |
| 1906 | |
| 1907 | if (pool->next_mapping) |
| 1908 | mempool_free(pool->next_mapping, pool->mapping_pool); |
| 1909 | mempool_destroy(pool->mapping_pool); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1910 | dm_deferred_set_destroy(pool->shared_read_ds); |
| 1911 | dm_deferred_set_destroy(pool->all_io_ds); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1912 | kfree(pool); |
| 1913 | } |
| 1914 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1915 | static struct kmem_cache *_new_mapping_cache; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1916 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1917 | static struct pool *pool_create(struct mapped_device *pool_md, |
| 1918 | struct block_device *metadata_dev, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1919 | unsigned long block_size, |
| 1920 | int read_only, char **error) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1921 | { |
| 1922 | int r; |
| 1923 | void *err_p; |
| 1924 | struct pool *pool; |
| 1925 | struct dm_pool_metadata *pmd; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1926 | bool format_device = read_only ? false : true; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1927 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1928 | pmd = dm_pool_metadata_open(metadata_dev, block_size, format_device); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1929 | if (IS_ERR(pmd)) { |
| 1930 | *error = "Error creating metadata object"; |
| 1931 | return (struct pool *)pmd; |
| 1932 | } |
| 1933 | |
| 1934 | pool = kmalloc(sizeof(*pool), GFP_KERNEL); |
| 1935 | if (!pool) { |
| 1936 | *error = "Error allocating memory for pool"; |
| 1937 | err_p = ERR_PTR(-ENOMEM); |
| 1938 | goto bad_pool; |
| 1939 | } |
| 1940 | |
| 1941 | pool->pmd = pmd; |
| 1942 | pool->sectors_per_block = block_size; |
Mikulas Patocka | f9a8e0c | 2012-07-27 15:08:03 +0100 | [diff] [blame] | 1943 | if (block_size & (block_size - 1)) |
| 1944 | pool->sectors_per_block_shift = -1; |
| 1945 | else |
| 1946 | pool->sectors_per_block_shift = __ffs(block_size); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1947 | pool->low_water_blocks = 0; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 1948 | pool_features_init(&pool->pf); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1949 | pool->prison = dm_bio_prison_create(PRISON_CELLS); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1950 | if (!pool->prison) { |
| 1951 | *error = "Error creating pool's bio prison"; |
| 1952 | err_p = ERR_PTR(-ENOMEM); |
| 1953 | goto bad_prison; |
| 1954 | } |
| 1955 | |
Mikulas Patocka | df5d2e9 | 2013-03-01 22:45:49 +0000 | [diff] [blame] | 1956 | pool->copier = dm_kcopyd_client_create(&dm_kcopyd_throttle); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1957 | if (IS_ERR(pool->copier)) { |
| 1958 | r = PTR_ERR(pool->copier); |
| 1959 | *error = "Error creating pool's kcopyd client"; |
| 1960 | err_p = ERR_PTR(r); |
| 1961 | goto bad_kcopyd_client; |
| 1962 | } |
| 1963 | |
| 1964 | /* |
| 1965 | * Create singlethreaded workqueue that will service all devices |
| 1966 | * that use this metadata. |
| 1967 | */ |
| 1968 | pool->wq = alloc_ordered_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM); |
| 1969 | if (!pool->wq) { |
| 1970 | *error = "Error creating pool's workqueue"; |
| 1971 | err_p = ERR_PTR(-ENOMEM); |
| 1972 | goto bad_wq; |
| 1973 | } |
| 1974 | |
| 1975 | INIT_WORK(&pool->worker, do_worker); |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 1976 | INIT_DELAYED_WORK(&pool->waker, do_waker); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1977 | spin_lock_init(&pool->lock); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1978 | bio_list_init(&pool->deferred_flush_bios); |
| 1979 | INIT_LIST_HEAD(&pool->prepared_mappings); |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 1980 | INIT_LIST_HEAD(&pool->prepared_discards); |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 1981 | INIT_LIST_HEAD(&pool->active_thins); |
Joe Thornber | 88a6621 | 2013-12-04 20:16:12 -0500 | [diff] [blame] | 1982 | pool->low_water_triggered = false; |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 1983 | |
| 1984 | pool->shared_read_ds = dm_deferred_set_create(); |
| 1985 | if (!pool->shared_read_ds) { |
| 1986 | *error = "Error creating pool's shared read deferred set"; |
| 1987 | err_p = ERR_PTR(-ENOMEM); |
| 1988 | goto bad_shared_read_ds; |
| 1989 | } |
| 1990 | |
| 1991 | pool->all_io_ds = dm_deferred_set_create(); |
| 1992 | if (!pool->all_io_ds) { |
| 1993 | *error = "Error creating pool's all io deferred set"; |
| 1994 | err_p = ERR_PTR(-ENOMEM); |
| 1995 | goto bad_all_io_ds; |
| 1996 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 1997 | |
| 1998 | pool->next_mapping = NULL; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 1999 | pool->mapping_pool = mempool_create_slab_pool(MAPPING_POOL_SIZE, |
| 2000 | _new_mapping_cache); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2001 | if (!pool->mapping_pool) { |
| 2002 | *error = "Error creating pool's mapping mempool"; |
| 2003 | err_p = ERR_PTR(-ENOMEM); |
| 2004 | goto bad_mapping_pool; |
| 2005 | } |
| 2006 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2007 | pool->ref_count = 1; |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 2008 | pool->last_commit_jiffies = jiffies; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2009 | pool->pool_md = pool_md; |
| 2010 | pool->md_dev = metadata_dev; |
| 2011 | __pool_table_insert(pool); |
| 2012 | |
| 2013 | return pool; |
| 2014 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2015 | bad_mapping_pool: |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 2016 | dm_deferred_set_destroy(pool->all_io_ds); |
| 2017 | bad_all_io_ds: |
| 2018 | dm_deferred_set_destroy(pool->shared_read_ds); |
| 2019 | bad_shared_read_ds: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2020 | destroy_workqueue(pool->wq); |
| 2021 | bad_wq: |
| 2022 | dm_kcopyd_client_destroy(pool->copier); |
| 2023 | bad_kcopyd_client: |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 2024 | dm_bio_prison_destroy(pool->prison); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2025 | bad_prison: |
| 2026 | kfree(pool); |
| 2027 | bad_pool: |
| 2028 | if (dm_pool_metadata_close(pmd)) |
| 2029 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); |
| 2030 | |
| 2031 | return err_p; |
| 2032 | } |
| 2033 | |
| 2034 | static void __pool_inc(struct pool *pool) |
| 2035 | { |
| 2036 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 2037 | pool->ref_count++; |
| 2038 | } |
| 2039 | |
| 2040 | static void __pool_dec(struct pool *pool) |
| 2041 | { |
| 2042 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); |
| 2043 | BUG_ON(!pool->ref_count); |
| 2044 | if (!--pool->ref_count) |
| 2045 | __pool_destroy(pool); |
| 2046 | } |
| 2047 | |
| 2048 | static struct pool *__pool_find(struct mapped_device *pool_md, |
| 2049 | struct block_device *metadata_dev, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2050 | unsigned long block_size, int read_only, |
| 2051 | char **error, int *created) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2052 | { |
| 2053 | struct pool *pool = __pool_table_lookup_metadata_dev(metadata_dev); |
| 2054 | |
| 2055 | if (pool) { |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 2056 | if (pool->pool_md != pool_md) { |
| 2057 | *error = "metadata device already in use by a pool"; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2058 | return ERR_PTR(-EBUSY); |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 2059 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2060 | __pool_inc(pool); |
| 2061 | |
| 2062 | } else { |
| 2063 | pool = __pool_table_lookup(pool_md); |
| 2064 | if (pool) { |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 2065 | if (pool->md_dev != metadata_dev) { |
| 2066 | *error = "different pool cannot replace a pool"; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2067 | return ERR_PTR(-EINVAL); |
Mike Snitzer | f09996c | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 2068 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2069 | __pool_inc(pool); |
| 2070 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2071 | } else { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2072 | pool = pool_create(pool_md, metadata_dev, block_size, read_only, error); |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2073 | *created = 1; |
| 2074 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2075 | } |
| 2076 | |
| 2077 | return pool; |
| 2078 | } |
| 2079 | |
| 2080 | /*---------------------------------------------------------------- |
| 2081 | * Pool target methods |
| 2082 | *--------------------------------------------------------------*/ |
| 2083 | static void pool_dtr(struct dm_target *ti) |
| 2084 | { |
| 2085 | struct pool_c *pt = ti->private; |
| 2086 | |
| 2087 | mutex_lock(&dm_thin_pool_table.mutex); |
| 2088 | |
| 2089 | unbind_control_target(pt->pool, ti); |
| 2090 | __pool_dec(pt->pool); |
| 2091 | dm_put_device(ti, pt->metadata_dev); |
| 2092 | dm_put_device(ti, pt->data_dev); |
| 2093 | kfree(pt); |
| 2094 | |
| 2095 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2096 | } |
| 2097 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2098 | static int parse_pool_features(struct dm_arg_set *as, struct pool_features *pf, |
| 2099 | struct dm_target *ti) |
| 2100 | { |
| 2101 | int r; |
| 2102 | unsigned argc; |
| 2103 | const char *arg_name; |
| 2104 | |
| 2105 | static struct dm_arg _args[] = { |
Mike Snitzer | 74aa45c | 2014-01-15 19:07:58 -0500 | [diff] [blame] | 2106 | {0, 4, "Invalid number of pool feature arguments"}, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2107 | }; |
| 2108 | |
| 2109 | /* |
| 2110 | * No feature arguments supplied. |
| 2111 | */ |
| 2112 | if (!as->argc) |
| 2113 | return 0; |
| 2114 | |
| 2115 | r = dm_read_arg_group(_args, as, &argc, &ti->error); |
| 2116 | if (r) |
| 2117 | return -EINVAL; |
| 2118 | |
| 2119 | while (argc && !r) { |
| 2120 | arg_name = dm_shift_arg(as); |
| 2121 | argc--; |
| 2122 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2123 | if (!strcasecmp(arg_name, "skip_block_zeroing")) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 2124 | pf->zero_new_blocks = false; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2125 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2126 | else if (!strcasecmp(arg_name, "ignore_discard")) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 2127 | pf->discard_enabled = false; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2128 | |
| 2129 | else if (!strcasecmp(arg_name, "no_discard_passdown")) |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 2130 | pf->discard_passdown = false; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2131 | |
| 2132 | else if (!strcasecmp(arg_name, "read_only")) |
| 2133 | pf->mode = PM_READ_ONLY; |
| 2134 | |
Mike Snitzer | 787a996c | 2013-12-06 16:21:43 -0500 | [diff] [blame] | 2135 | else if (!strcasecmp(arg_name, "error_if_no_space")) |
| 2136 | pf->error_if_no_space = true; |
| 2137 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2138 | else { |
| 2139 | ti->error = "Unrecognised pool feature requested"; |
| 2140 | r = -EINVAL; |
| 2141 | break; |
| 2142 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2143 | } |
| 2144 | |
| 2145 | return r; |
| 2146 | } |
| 2147 | |
Joe Thornber | ac8c3f3 | 2013-05-10 14:37:21 +0100 | [diff] [blame] | 2148 | static void metadata_low_callback(void *context) |
| 2149 | { |
| 2150 | struct pool *pool = context; |
| 2151 | |
| 2152 | DMWARN("%s: reached low water mark for metadata device: sending event.", |
| 2153 | dm_device_name(pool->pool_md)); |
| 2154 | |
| 2155 | dm_table_event(pool->ti->table); |
| 2156 | } |
| 2157 | |
Mike Snitzer | 7d48935 | 2014-02-12 23:58:15 -0500 | [diff] [blame] | 2158 | static sector_t get_dev_size(struct block_device *bdev) |
Joe Thornber | b17446d | 2013-05-10 14:37:18 +0100 | [diff] [blame] | 2159 | { |
Mike Snitzer | 7d48935 | 2014-02-12 23:58:15 -0500 | [diff] [blame] | 2160 | return i_size_read(bdev->bd_inode) >> SECTOR_SHIFT; |
| 2161 | } |
| 2162 | |
| 2163 | static void warn_if_metadata_device_too_big(struct block_device *bdev) |
| 2164 | { |
| 2165 | sector_t metadata_dev_size = get_dev_size(bdev); |
Joe Thornber | b17446d | 2013-05-10 14:37:18 +0100 | [diff] [blame] | 2166 | char buffer[BDEVNAME_SIZE]; |
| 2167 | |
Mike Snitzer | 7d48935 | 2014-02-12 23:58:15 -0500 | [diff] [blame] | 2168 | if (metadata_dev_size > THIN_METADATA_MAX_SECTORS_WARNING) |
Joe Thornber | b17446d | 2013-05-10 14:37:18 +0100 | [diff] [blame] | 2169 | DMWARN("Metadata device %s is larger than %u sectors: excess space will not be used.", |
| 2170 | bdevname(bdev, buffer), THIN_METADATA_MAX_SECTORS); |
Mike Snitzer | 7d48935 | 2014-02-12 23:58:15 -0500 | [diff] [blame] | 2171 | } |
| 2172 | |
| 2173 | static sector_t get_metadata_dev_size(struct block_device *bdev) |
| 2174 | { |
| 2175 | sector_t metadata_dev_size = get_dev_size(bdev); |
| 2176 | |
| 2177 | if (metadata_dev_size > THIN_METADATA_MAX_SECTORS) |
| 2178 | metadata_dev_size = THIN_METADATA_MAX_SECTORS; |
Joe Thornber | b17446d | 2013-05-10 14:37:18 +0100 | [diff] [blame] | 2179 | |
| 2180 | return metadata_dev_size; |
| 2181 | } |
| 2182 | |
Joe Thornber | 24347e9 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2183 | static dm_block_t get_metadata_dev_size_in_blocks(struct block_device *bdev) |
| 2184 | { |
| 2185 | sector_t metadata_dev_size = get_metadata_dev_size(bdev); |
| 2186 | |
Mike Snitzer | 7d48935 | 2014-02-12 23:58:15 -0500 | [diff] [blame] | 2187 | sector_div(metadata_dev_size, THIN_METADATA_BLOCK_SIZE); |
Joe Thornber | 24347e9 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2188 | |
| 2189 | return metadata_dev_size; |
| 2190 | } |
| 2191 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2192 | /* |
Joe Thornber | ac8c3f3 | 2013-05-10 14:37:21 +0100 | [diff] [blame] | 2193 | * When a metadata threshold is crossed a dm event is triggered, and |
| 2194 | * userland should respond by growing the metadata device. We could let |
| 2195 | * userland set the threshold, like we do with the data threshold, but I'm |
| 2196 | * not sure they know enough to do this well. |
| 2197 | */ |
| 2198 | static dm_block_t calc_metadata_threshold(struct pool_c *pt) |
| 2199 | { |
| 2200 | /* |
| 2201 | * 4M is ample for all ops with the possible exception of thin |
| 2202 | * device deletion which is harmless if it fails (just retry the |
| 2203 | * delete after you've grown the device). |
| 2204 | */ |
| 2205 | dm_block_t quarter = get_metadata_dev_size_in_blocks(pt->metadata_dev->bdev) / 4; |
| 2206 | return min((dm_block_t)1024ULL /* 4M */, quarter); |
| 2207 | } |
| 2208 | |
| 2209 | /* |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2210 | * thin-pool <metadata dev> <data dev> |
| 2211 | * <data block size (sectors)> |
| 2212 | * <low water mark (blocks)> |
| 2213 | * [<#feature args> [<arg>]*] |
| 2214 | * |
| 2215 | * Optional feature arguments are: |
| 2216 | * skip_block_zeroing: skips the zeroing of newly-provisioned blocks. |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2217 | * ignore_discard: disable discard |
| 2218 | * no_discard_passdown: don't pass discards down to the data device |
Mike Snitzer | 787a996c | 2013-12-06 16:21:43 -0500 | [diff] [blame] | 2219 | * read_only: Don't allow any changes to be made to the pool metadata. |
| 2220 | * error_if_no_space: error IOs, instead of queueing, if no space. |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2221 | */ |
| 2222 | static int pool_ctr(struct dm_target *ti, unsigned argc, char **argv) |
| 2223 | { |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2224 | int r, pool_created = 0; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2225 | struct pool_c *pt; |
| 2226 | struct pool *pool; |
| 2227 | struct pool_features pf; |
| 2228 | struct dm_arg_set as; |
| 2229 | struct dm_dev *data_dev; |
| 2230 | unsigned long block_size; |
| 2231 | dm_block_t low_water_blocks; |
| 2232 | struct dm_dev *metadata_dev; |
Joe Thornber | 5d0db96 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2233 | fmode_t metadata_mode; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2234 | |
| 2235 | /* |
| 2236 | * FIXME Remove validation from scope of lock. |
| 2237 | */ |
| 2238 | mutex_lock(&dm_thin_pool_table.mutex); |
| 2239 | |
| 2240 | if (argc < 4) { |
| 2241 | ti->error = "Invalid argument count"; |
| 2242 | r = -EINVAL; |
| 2243 | goto out_unlock; |
| 2244 | } |
Joe Thornber | 5d0db96 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2245 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2246 | as.argc = argc; |
| 2247 | as.argv = argv; |
| 2248 | |
Joe Thornber | 5d0db96 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2249 | /* |
| 2250 | * Set default pool features. |
| 2251 | */ |
| 2252 | pool_features_init(&pf); |
| 2253 | |
| 2254 | dm_consume_args(&as, 4); |
| 2255 | r = parse_pool_features(&as, &pf, ti); |
| 2256 | if (r) |
| 2257 | goto out_unlock; |
| 2258 | |
| 2259 | metadata_mode = FMODE_READ | ((pf.mode == PM_READ_ONLY) ? 0 : FMODE_WRITE); |
| 2260 | r = dm_get_device(ti, argv[0], metadata_mode, &metadata_dev); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2261 | if (r) { |
| 2262 | ti->error = "Error opening metadata block device"; |
| 2263 | goto out_unlock; |
| 2264 | } |
Mike Snitzer | 7d48935 | 2014-02-12 23:58:15 -0500 | [diff] [blame] | 2265 | warn_if_metadata_device_too_big(metadata_dev->bdev); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2266 | |
| 2267 | r = dm_get_device(ti, argv[1], FMODE_READ | FMODE_WRITE, &data_dev); |
| 2268 | if (r) { |
| 2269 | ti->error = "Error getting data device"; |
| 2270 | goto out_metadata; |
| 2271 | } |
| 2272 | |
| 2273 | if (kstrtoul(argv[2], 10, &block_size) || !block_size || |
| 2274 | block_size < DATA_DEV_BLOCK_SIZE_MIN_SECTORS || |
| 2275 | block_size > DATA_DEV_BLOCK_SIZE_MAX_SECTORS || |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 2276 | block_size & (DATA_DEV_BLOCK_SIZE_MIN_SECTORS - 1)) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2277 | ti->error = "Invalid block size"; |
| 2278 | r = -EINVAL; |
| 2279 | goto out; |
| 2280 | } |
| 2281 | |
| 2282 | if (kstrtoull(argv[3], 10, (unsigned long long *)&low_water_blocks)) { |
| 2283 | ti->error = "Invalid low water mark"; |
| 2284 | r = -EINVAL; |
| 2285 | goto out; |
| 2286 | } |
| 2287 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2288 | pt = kzalloc(sizeof(*pt), GFP_KERNEL); |
| 2289 | if (!pt) { |
| 2290 | r = -ENOMEM; |
| 2291 | goto out; |
| 2292 | } |
| 2293 | |
| 2294 | pool = __pool_find(dm_table_get_md(ti->table), metadata_dev->bdev, |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2295 | block_size, pf.mode == PM_READ_ONLY, &ti->error, &pool_created); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2296 | if (IS_ERR(pool)) { |
| 2297 | r = PTR_ERR(pool); |
| 2298 | goto out_free_pt; |
| 2299 | } |
| 2300 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2301 | /* |
| 2302 | * 'pool_created' reflects whether this is the first table load. |
| 2303 | * Top level discard support is not allowed to be changed after |
| 2304 | * initial load. This would require a pool reload to trigger thin |
| 2305 | * device changes. |
| 2306 | */ |
| 2307 | if (!pool_created && pf.discard_enabled != pool->pf.discard_enabled) { |
| 2308 | ti->error = "Discard support cannot be disabled once enabled"; |
| 2309 | r = -EINVAL; |
| 2310 | goto out_flags_changed; |
| 2311 | } |
| 2312 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2313 | pt->pool = pool; |
| 2314 | pt->ti = ti; |
| 2315 | pt->metadata_dev = metadata_dev; |
| 2316 | pt->data_dev = data_dev; |
| 2317 | pt->low_water_blocks = low_water_blocks; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2318 | pt->adjusted_pf = pt->requested_pf = pf; |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 2319 | ti->num_flush_bios = 1; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 2320 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2321 | /* |
| 2322 | * Only need to enable discards if the pool should pass |
| 2323 | * them down to the data device. The thin device's discard |
| 2324 | * processing will cause mappings to be removed from the btree. |
| 2325 | */ |
Mike Snitzer | b60ab99 | 2013-09-19 18:49:11 -0400 | [diff] [blame] | 2326 | ti->discard_zeroes_data_unsupported = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2327 | if (pf.discard_enabled && pf.discard_passdown) { |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 2328 | ti->num_discard_bios = 1; |
Mike Snitzer | 9bc142d | 2012-09-26 23:45:46 +0100 | [diff] [blame] | 2329 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2330 | /* |
| 2331 | * Setting 'discards_supported' circumvents the normal |
| 2332 | * stacking of discard limits (this keeps the pool and |
| 2333 | * thin devices' discard limits consistent). |
| 2334 | */ |
Alasdair G Kergon | 0ac5548 | 2012-07-27 15:08:08 +0100 | [diff] [blame] | 2335 | ti->discards_supported = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2336 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2337 | ti->private = pt; |
| 2338 | |
Joe Thornber | ac8c3f3 | 2013-05-10 14:37:21 +0100 | [diff] [blame] | 2339 | r = dm_pool_register_metadata_threshold(pt->pool->pmd, |
| 2340 | calc_metadata_threshold(pt), |
| 2341 | metadata_low_callback, |
| 2342 | pool); |
| 2343 | if (r) |
| 2344 | goto out_free_pt; |
| 2345 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2346 | pt->callbacks.congested_fn = pool_is_congested; |
| 2347 | dm_table_add_target_callbacks(ti->table, &pt->callbacks); |
| 2348 | |
| 2349 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2350 | |
| 2351 | return 0; |
| 2352 | |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 2353 | out_flags_changed: |
| 2354 | __pool_dec(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2355 | out_free_pt: |
| 2356 | kfree(pt); |
| 2357 | out: |
| 2358 | dm_put_device(ti, data_dev); |
| 2359 | out_metadata: |
| 2360 | dm_put_device(ti, metadata_dev); |
| 2361 | out_unlock: |
| 2362 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 2363 | |
| 2364 | return r; |
| 2365 | } |
| 2366 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 2367 | static int pool_map(struct dm_target *ti, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2368 | { |
| 2369 | int r; |
| 2370 | struct pool_c *pt = ti->private; |
| 2371 | struct pool *pool = pt->pool; |
| 2372 | unsigned long flags; |
| 2373 | |
| 2374 | /* |
| 2375 | * As this is a singleton target, ti->begin is always zero. |
| 2376 | */ |
| 2377 | spin_lock_irqsave(&pool->lock, flags); |
| 2378 | bio->bi_bdev = pt->data_dev->bdev; |
| 2379 | r = DM_MAPIO_REMAPPED; |
| 2380 | spin_unlock_irqrestore(&pool->lock, flags); |
| 2381 | |
| 2382 | return r; |
| 2383 | } |
| 2384 | |
Joe Thornber | b17446d | 2013-05-10 14:37:18 +0100 | [diff] [blame] | 2385 | static int maybe_resize_data_dev(struct dm_target *ti, bool *need_commit) |
| 2386 | { |
| 2387 | int r; |
| 2388 | struct pool_c *pt = ti->private; |
| 2389 | struct pool *pool = pt->pool; |
| 2390 | sector_t data_size = ti->len; |
| 2391 | dm_block_t sb_data_size; |
| 2392 | |
| 2393 | *need_commit = false; |
| 2394 | |
| 2395 | (void) sector_div(data_size, pool->sectors_per_block); |
| 2396 | |
| 2397 | r = dm_pool_get_data_dev_size(pool->pmd, &sb_data_size); |
| 2398 | if (r) { |
Mike Snitzer | 4fa5971 | 2013-08-21 17:30:40 -0400 | [diff] [blame] | 2399 | DMERR("%s: failed to retrieve data device size", |
| 2400 | dm_device_name(pool->pool_md)); |
Joe Thornber | b17446d | 2013-05-10 14:37:18 +0100 | [diff] [blame] | 2401 | return r; |
| 2402 | } |
| 2403 | |
| 2404 | if (data_size < sb_data_size) { |
Mike Snitzer | 4fa5971 | 2013-08-21 17:30:40 -0400 | [diff] [blame] | 2405 | DMERR("%s: pool target (%llu blocks) too small: expected %llu", |
| 2406 | dm_device_name(pool->pool_md), |
Joe Thornber | b17446d | 2013-05-10 14:37:18 +0100 | [diff] [blame] | 2407 | (unsigned long long)data_size, sb_data_size); |
| 2408 | return -EINVAL; |
| 2409 | |
| 2410 | } else if (data_size > sb_data_size) { |
Mike Snitzer | 07f2b6e | 2014-02-14 11:58:41 -0500 | [diff] [blame] | 2411 | if (dm_pool_metadata_needs_check(pool->pmd)) { |
| 2412 | DMERR("%s: unable to grow the data device until repaired.", |
| 2413 | dm_device_name(pool->pool_md)); |
| 2414 | return 0; |
| 2415 | } |
| 2416 | |
Mike Snitzer | 6f7f51d | 2013-12-04 10:25:53 -0500 | [diff] [blame] | 2417 | if (sb_data_size) |
| 2418 | DMINFO("%s: growing the data device from %llu to %llu blocks", |
| 2419 | dm_device_name(pool->pool_md), |
| 2420 | sb_data_size, (unsigned long long)data_size); |
Joe Thornber | b17446d | 2013-05-10 14:37:18 +0100 | [diff] [blame] | 2421 | r = dm_pool_resize_data_dev(pool->pmd, data_size); |
| 2422 | if (r) { |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 2423 | metadata_operation_failed(pool, "dm_pool_resize_data_dev", r); |
Joe Thornber | b17446d | 2013-05-10 14:37:18 +0100 | [diff] [blame] | 2424 | return r; |
| 2425 | } |
| 2426 | |
| 2427 | *need_commit = true; |
| 2428 | } |
| 2429 | |
| 2430 | return 0; |
| 2431 | } |
| 2432 | |
Joe Thornber | 24347e9 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2433 | static int maybe_resize_metadata_dev(struct dm_target *ti, bool *need_commit) |
| 2434 | { |
| 2435 | int r; |
| 2436 | struct pool_c *pt = ti->private; |
| 2437 | struct pool *pool = pt->pool; |
| 2438 | dm_block_t metadata_dev_size, sb_metadata_dev_size; |
| 2439 | |
| 2440 | *need_commit = false; |
| 2441 | |
Alasdair G Kergon | 610bba8 | 2013-05-19 18:57:50 +0100 | [diff] [blame] | 2442 | metadata_dev_size = get_metadata_dev_size_in_blocks(pool->md_dev); |
Joe Thornber | 24347e9 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2443 | |
| 2444 | r = dm_pool_get_metadata_dev_size(pool->pmd, &sb_metadata_dev_size); |
| 2445 | if (r) { |
Mike Snitzer | 4fa5971 | 2013-08-21 17:30:40 -0400 | [diff] [blame] | 2446 | DMERR("%s: failed to retrieve metadata device size", |
| 2447 | dm_device_name(pool->pool_md)); |
Joe Thornber | 24347e9 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2448 | return r; |
| 2449 | } |
| 2450 | |
| 2451 | if (metadata_dev_size < sb_metadata_dev_size) { |
Mike Snitzer | 4fa5971 | 2013-08-21 17:30:40 -0400 | [diff] [blame] | 2452 | DMERR("%s: metadata device (%llu blocks) too small: expected %llu", |
| 2453 | dm_device_name(pool->pool_md), |
Joe Thornber | 24347e9 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2454 | metadata_dev_size, sb_metadata_dev_size); |
| 2455 | return -EINVAL; |
| 2456 | |
| 2457 | } else if (metadata_dev_size > sb_metadata_dev_size) { |
Mike Snitzer | 07f2b6e | 2014-02-14 11:58:41 -0500 | [diff] [blame] | 2458 | if (dm_pool_metadata_needs_check(pool->pmd)) { |
| 2459 | DMERR("%s: unable to grow the metadata device until repaired.", |
| 2460 | dm_device_name(pool->pool_md)); |
| 2461 | return 0; |
| 2462 | } |
| 2463 | |
Mike Snitzer | 7d48935 | 2014-02-12 23:58:15 -0500 | [diff] [blame] | 2464 | warn_if_metadata_device_too_big(pool->md_dev); |
Mike Snitzer | 6f7f51d | 2013-12-04 10:25:53 -0500 | [diff] [blame] | 2465 | DMINFO("%s: growing the metadata device from %llu to %llu blocks", |
| 2466 | dm_device_name(pool->pool_md), |
| 2467 | sb_metadata_dev_size, metadata_dev_size); |
Joe Thornber | 24347e9 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2468 | r = dm_pool_resize_metadata_dev(pool->pmd, metadata_dev_size); |
| 2469 | if (r) { |
Joe Thornber | b533065 | 2013-12-04 19:51:33 -0500 | [diff] [blame] | 2470 | metadata_operation_failed(pool, "dm_pool_resize_metadata_dev", r); |
Joe Thornber | 24347e9 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2471 | return r; |
| 2472 | } |
| 2473 | |
| 2474 | *need_commit = true; |
| 2475 | } |
| 2476 | |
| 2477 | return 0; |
| 2478 | } |
| 2479 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2480 | /* |
| 2481 | * Retrieves the number of blocks of the data device from |
| 2482 | * the superblock and compares it to the actual device size, |
| 2483 | * thus resizing the data device in case it has grown. |
| 2484 | * |
| 2485 | * This both copes with opening preallocated data devices in the ctr |
| 2486 | * being followed by a resume |
| 2487 | * -and- |
| 2488 | * calling the resume method individually after userspace has |
| 2489 | * grown the data device in reaction to a table event. |
| 2490 | */ |
| 2491 | static int pool_preresume(struct dm_target *ti) |
| 2492 | { |
| 2493 | int r; |
Joe Thornber | 24347e9 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2494 | bool need_commit1, need_commit2; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2495 | struct pool_c *pt = ti->private; |
| 2496 | struct pool *pool = pt->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2497 | |
| 2498 | /* |
| 2499 | * Take control of the pool object. |
| 2500 | */ |
| 2501 | r = bind_control_target(pool, ti); |
| 2502 | if (r) |
| 2503 | return r; |
| 2504 | |
Joe Thornber | b17446d | 2013-05-10 14:37:18 +0100 | [diff] [blame] | 2505 | r = maybe_resize_data_dev(ti, &need_commit1); |
| 2506 | if (r) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2507 | return r; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2508 | |
Joe Thornber | 24347e9 | 2013-05-10 14:37:19 +0100 | [diff] [blame] | 2509 | r = maybe_resize_metadata_dev(ti, &need_commit2); |
| 2510 | if (r) |
| 2511 | return r; |
| 2512 | |
| 2513 | if (need_commit1 || need_commit2) |
Joe Thornber | 020cc3b | 2013-12-04 15:05:36 -0500 | [diff] [blame] | 2514 | (void) commit(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2515 | |
| 2516 | return 0; |
| 2517 | } |
| 2518 | |
| 2519 | static void pool_resume(struct dm_target *ti) |
| 2520 | { |
| 2521 | struct pool_c *pt = ti->private; |
| 2522 | struct pool *pool = pt->pool; |
| 2523 | unsigned long flags; |
| 2524 | |
| 2525 | spin_lock_irqsave(&pool->lock, flags); |
Joe Thornber | 88a6621 | 2013-12-04 20:16:12 -0500 | [diff] [blame] | 2526 | pool->low_water_triggered = false; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2527 | spin_unlock_irqrestore(&pool->lock, flags); |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 2528 | requeue_bios(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2529 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 2530 | do_waker(&pool->waker.work); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2531 | } |
| 2532 | |
| 2533 | static void pool_postsuspend(struct dm_target *ti) |
| 2534 | { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2535 | struct pool_c *pt = ti->private; |
| 2536 | struct pool *pool = pt->pool; |
| 2537 | |
Joe Thornber | 905e51b | 2012-03-28 18:41:27 +0100 | [diff] [blame] | 2538 | cancel_delayed_work(&pool->waker); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2539 | flush_workqueue(pool->wq); |
Joe Thornber | 020cc3b | 2013-12-04 15:05:36 -0500 | [diff] [blame] | 2540 | (void) commit(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2541 | } |
| 2542 | |
| 2543 | static int check_arg_count(unsigned argc, unsigned args_required) |
| 2544 | { |
| 2545 | if (argc != args_required) { |
| 2546 | DMWARN("Message received with %u arguments instead of %u.", |
| 2547 | argc, args_required); |
| 2548 | return -EINVAL; |
| 2549 | } |
| 2550 | |
| 2551 | return 0; |
| 2552 | } |
| 2553 | |
| 2554 | static int read_dev_id(char *arg, dm_thin_id *dev_id, int warning) |
| 2555 | { |
| 2556 | if (!kstrtoull(arg, 10, (unsigned long long *)dev_id) && |
| 2557 | *dev_id <= MAX_DEV_ID) |
| 2558 | return 0; |
| 2559 | |
| 2560 | if (warning) |
| 2561 | DMWARN("Message received with invalid device id: %s", arg); |
| 2562 | |
| 2563 | return -EINVAL; |
| 2564 | } |
| 2565 | |
| 2566 | static int process_create_thin_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2567 | { |
| 2568 | dm_thin_id dev_id; |
| 2569 | int r; |
| 2570 | |
| 2571 | r = check_arg_count(argc, 2); |
| 2572 | if (r) |
| 2573 | return r; |
| 2574 | |
| 2575 | r = read_dev_id(argv[1], &dev_id, 1); |
| 2576 | if (r) |
| 2577 | return r; |
| 2578 | |
| 2579 | r = dm_pool_create_thin(pool->pmd, dev_id); |
| 2580 | if (r) { |
| 2581 | DMWARN("Creation of new thinly-provisioned device with id %s failed.", |
| 2582 | argv[1]); |
| 2583 | return r; |
| 2584 | } |
| 2585 | |
| 2586 | return 0; |
| 2587 | } |
| 2588 | |
| 2589 | static int process_create_snap_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2590 | { |
| 2591 | dm_thin_id dev_id; |
| 2592 | dm_thin_id origin_dev_id; |
| 2593 | int r; |
| 2594 | |
| 2595 | r = check_arg_count(argc, 3); |
| 2596 | if (r) |
| 2597 | return r; |
| 2598 | |
| 2599 | r = read_dev_id(argv[1], &dev_id, 1); |
| 2600 | if (r) |
| 2601 | return r; |
| 2602 | |
| 2603 | r = read_dev_id(argv[2], &origin_dev_id, 1); |
| 2604 | if (r) |
| 2605 | return r; |
| 2606 | |
| 2607 | r = dm_pool_create_snap(pool->pmd, dev_id, origin_dev_id); |
| 2608 | if (r) { |
| 2609 | DMWARN("Creation of new snapshot %s of device %s failed.", |
| 2610 | argv[1], argv[2]); |
| 2611 | return r; |
| 2612 | } |
| 2613 | |
| 2614 | return 0; |
| 2615 | } |
| 2616 | |
| 2617 | static int process_delete_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2618 | { |
| 2619 | dm_thin_id dev_id; |
| 2620 | int r; |
| 2621 | |
| 2622 | r = check_arg_count(argc, 2); |
| 2623 | if (r) |
| 2624 | return r; |
| 2625 | |
| 2626 | r = read_dev_id(argv[1], &dev_id, 1); |
| 2627 | if (r) |
| 2628 | return r; |
| 2629 | |
| 2630 | r = dm_pool_delete_thin_device(pool->pmd, dev_id); |
| 2631 | if (r) |
| 2632 | DMWARN("Deletion of thin device %s failed.", argv[1]); |
| 2633 | |
| 2634 | return r; |
| 2635 | } |
| 2636 | |
| 2637 | static int process_set_transaction_id_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2638 | { |
| 2639 | dm_thin_id old_id, new_id; |
| 2640 | int r; |
| 2641 | |
| 2642 | r = check_arg_count(argc, 3); |
| 2643 | if (r) |
| 2644 | return r; |
| 2645 | |
| 2646 | if (kstrtoull(argv[1], 10, (unsigned long long *)&old_id)) { |
| 2647 | DMWARN("set_transaction_id message: Unrecognised id %s.", argv[1]); |
| 2648 | return -EINVAL; |
| 2649 | } |
| 2650 | |
| 2651 | if (kstrtoull(argv[2], 10, (unsigned long long *)&new_id)) { |
| 2652 | DMWARN("set_transaction_id message: Unrecognised new id %s.", argv[2]); |
| 2653 | return -EINVAL; |
| 2654 | } |
| 2655 | |
| 2656 | r = dm_pool_set_metadata_transaction_id(pool->pmd, old_id, new_id); |
| 2657 | if (r) { |
| 2658 | DMWARN("Failed to change transaction id from %s to %s.", |
| 2659 | argv[1], argv[2]); |
| 2660 | return r; |
| 2661 | } |
| 2662 | |
| 2663 | return 0; |
| 2664 | } |
| 2665 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2666 | static int process_reserve_metadata_snap_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2667 | { |
| 2668 | int r; |
| 2669 | |
| 2670 | r = check_arg_count(argc, 1); |
| 2671 | if (r) |
| 2672 | return r; |
| 2673 | |
Joe Thornber | 020cc3b | 2013-12-04 15:05:36 -0500 | [diff] [blame] | 2674 | (void) commit(pool); |
Joe Thornber | 0d200ae | 2012-07-03 12:55:31 +0100 | [diff] [blame] | 2675 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2676 | r = dm_pool_reserve_metadata_snap(pool->pmd); |
| 2677 | if (r) |
| 2678 | DMWARN("reserve_metadata_snap message failed."); |
| 2679 | |
| 2680 | return r; |
| 2681 | } |
| 2682 | |
| 2683 | static int process_release_metadata_snap_mesg(unsigned argc, char **argv, struct pool *pool) |
| 2684 | { |
| 2685 | int r; |
| 2686 | |
| 2687 | r = check_arg_count(argc, 1); |
| 2688 | if (r) |
| 2689 | return r; |
| 2690 | |
| 2691 | r = dm_pool_release_metadata_snap(pool->pmd); |
| 2692 | if (r) |
| 2693 | DMWARN("release_metadata_snap message failed."); |
| 2694 | |
| 2695 | return r; |
| 2696 | } |
| 2697 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2698 | /* |
| 2699 | * Messages supported: |
| 2700 | * create_thin <dev_id> |
| 2701 | * create_snap <dev_id> <origin_id> |
| 2702 | * delete <dev_id> |
| 2703 | * trim <dev_id> <new_size_in_sectors> |
| 2704 | * set_transaction_id <current_trans_id> <new_trans_id> |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2705 | * reserve_metadata_snap |
| 2706 | * release_metadata_snap |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2707 | */ |
| 2708 | static int pool_message(struct dm_target *ti, unsigned argc, char **argv) |
| 2709 | { |
| 2710 | int r = -EINVAL; |
| 2711 | struct pool_c *pt = ti->private; |
| 2712 | struct pool *pool = pt->pool; |
| 2713 | |
| 2714 | if (!strcasecmp(argv[0], "create_thin")) |
| 2715 | r = process_create_thin_mesg(argc, argv, pool); |
| 2716 | |
| 2717 | else if (!strcasecmp(argv[0], "create_snap")) |
| 2718 | r = process_create_snap_mesg(argc, argv, pool); |
| 2719 | |
| 2720 | else if (!strcasecmp(argv[0], "delete")) |
| 2721 | r = process_delete_mesg(argc, argv, pool); |
| 2722 | |
| 2723 | else if (!strcasecmp(argv[0], "set_transaction_id")) |
| 2724 | r = process_set_transaction_id_mesg(argc, argv, pool); |
| 2725 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2726 | else if (!strcasecmp(argv[0], "reserve_metadata_snap")) |
| 2727 | r = process_reserve_metadata_snap_mesg(argc, argv, pool); |
| 2728 | |
| 2729 | else if (!strcasecmp(argv[0], "release_metadata_snap")) |
| 2730 | r = process_release_metadata_snap_mesg(argc, argv, pool); |
| 2731 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2732 | else |
| 2733 | DMWARN("Unrecognised thin pool target message received: %s", argv[0]); |
| 2734 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2735 | if (!r) |
Joe Thornber | 020cc3b | 2013-12-04 15:05:36 -0500 | [diff] [blame] | 2736 | (void) commit(pool); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2737 | |
| 2738 | return r; |
| 2739 | } |
| 2740 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2741 | static void emit_flags(struct pool_features *pf, char *result, |
| 2742 | unsigned sz, unsigned maxlen) |
| 2743 | { |
| 2744 | unsigned count = !pf->zero_new_blocks + !pf->discard_enabled + |
Mike Snitzer | 787a996c | 2013-12-06 16:21:43 -0500 | [diff] [blame] | 2745 | !pf->discard_passdown + (pf->mode == PM_READ_ONLY) + |
| 2746 | pf->error_if_no_space; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2747 | DMEMIT("%u ", count); |
| 2748 | |
| 2749 | if (!pf->zero_new_blocks) |
| 2750 | DMEMIT("skip_block_zeroing "); |
| 2751 | |
| 2752 | if (!pf->discard_enabled) |
| 2753 | DMEMIT("ignore_discard "); |
| 2754 | |
| 2755 | if (!pf->discard_passdown) |
| 2756 | DMEMIT("no_discard_passdown "); |
| 2757 | |
| 2758 | if (pf->mode == PM_READ_ONLY) |
| 2759 | DMEMIT("read_only "); |
Mike Snitzer | 787a996c | 2013-12-06 16:21:43 -0500 | [diff] [blame] | 2760 | |
| 2761 | if (pf->error_if_no_space) |
| 2762 | DMEMIT("error_if_no_space "); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2763 | } |
| 2764 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2765 | /* |
| 2766 | * Status line is: |
| 2767 | * <transaction id> <used metadata sectors>/<total metadata sectors> |
| 2768 | * <used data sectors>/<total data sectors> <held metadata root> |
| 2769 | */ |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2770 | static void pool_status(struct dm_target *ti, status_type_t type, |
| 2771 | unsigned status_flags, char *result, unsigned maxlen) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2772 | { |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2773 | int r; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2774 | unsigned sz = 0; |
| 2775 | uint64_t transaction_id; |
| 2776 | dm_block_t nr_free_blocks_data; |
| 2777 | dm_block_t nr_free_blocks_metadata; |
| 2778 | dm_block_t nr_blocks_data; |
| 2779 | dm_block_t nr_blocks_metadata; |
| 2780 | dm_block_t held_root; |
| 2781 | char buf[BDEVNAME_SIZE]; |
| 2782 | char buf2[BDEVNAME_SIZE]; |
| 2783 | struct pool_c *pt = ti->private; |
| 2784 | struct pool *pool = pt->pool; |
| 2785 | |
| 2786 | switch (type) { |
| 2787 | case STATUSTYPE_INFO: |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2788 | if (get_pool_mode(pool) == PM_FAIL) { |
| 2789 | DMEMIT("Fail"); |
| 2790 | break; |
| 2791 | } |
| 2792 | |
Alasdair G Kergon | 1f4e0ff | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2793 | /* Commit to ensure statistics aren't out-of-date */ |
| 2794 | if (!(status_flags & DM_STATUS_NOFLUSH_FLAG) && !dm_suspended(ti)) |
Joe Thornber | 020cc3b | 2013-12-04 15:05:36 -0500 | [diff] [blame] | 2795 | (void) commit(pool); |
Alasdair G Kergon | 1f4e0ff | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2796 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2797 | r = dm_pool_get_metadata_transaction_id(pool->pmd, &transaction_id); |
| 2798 | if (r) { |
Mike Snitzer | 4fa5971 | 2013-08-21 17:30:40 -0400 | [diff] [blame] | 2799 | DMERR("%s: dm_pool_get_metadata_transaction_id returned %d", |
| 2800 | dm_device_name(pool->pool_md), r); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2801 | goto err; |
| 2802 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2803 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2804 | r = dm_pool_get_free_metadata_block_count(pool->pmd, &nr_free_blocks_metadata); |
| 2805 | if (r) { |
Mike Snitzer | 4fa5971 | 2013-08-21 17:30:40 -0400 | [diff] [blame] | 2806 | DMERR("%s: dm_pool_get_free_metadata_block_count returned %d", |
| 2807 | dm_device_name(pool->pool_md), r); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2808 | goto err; |
| 2809 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2810 | |
| 2811 | r = dm_pool_get_metadata_dev_size(pool->pmd, &nr_blocks_metadata); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2812 | if (r) { |
Mike Snitzer | 4fa5971 | 2013-08-21 17:30:40 -0400 | [diff] [blame] | 2813 | DMERR("%s: dm_pool_get_metadata_dev_size returned %d", |
| 2814 | dm_device_name(pool->pool_md), r); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2815 | goto err; |
| 2816 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2817 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2818 | r = dm_pool_get_free_block_count(pool->pmd, &nr_free_blocks_data); |
| 2819 | if (r) { |
Mike Snitzer | 4fa5971 | 2013-08-21 17:30:40 -0400 | [diff] [blame] | 2820 | DMERR("%s: dm_pool_get_free_block_count returned %d", |
| 2821 | dm_device_name(pool->pool_md), r); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2822 | goto err; |
| 2823 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2824 | |
| 2825 | r = dm_pool_get_data_dev_size(pool->pmd, &nr_blocks_data); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2826 | if (r) { |
Mike Snitzer | 4fa5971 | 2013-08-21 17:30:40 -0400 | [diff] [blame] | 2827 | DMERR("%s: dm_pool_get_data_dev_size returned %d", |
| 2828 | dm_device_name(pool->pool_md), r); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2829 | goto err; |
| 2830 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2831 | |
Joe Thornber | cc8394d | 2012-06-03 00:30:01 +0100 | [diff] [blame] | 2832 | r = dm_pool_get_metadata_snap(pool->pmd, &held_root); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2833 | if (r) { |
Mike Snitzer | 4fa5971 | 2013-08-21 17:30:40 -0400 | [diff] [blame] | 2834 | DMERR("%s: dm_pool_get_metadata_snap returned %d", |
| 2835 | dm_device_name(pool->pool_md), r); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2836 | goto err; |
| 2837 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2838 | |
| 2839 | DMEMIT("%llu %llu/%llu %llu/%llu ", |
| 2840 | (unsigned long long)transaction_id, |
| 2841 | (unsigned long long)(nr_blocks_metadata - nr_free_blocks_metadata), |
| 2842 | (unsigned long long)nr_blocks_metadata, |
| 2843 | (unsigned long long)(nr_blocks_data - nr_free_blocks_data), |
| 2844 | (unsigned long long)nr_blocks_data); |
| 2845 | |
| 2846 | if (held_root) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2847 | DMEMIT("%llu ", held_root); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2848 | else |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2849 | DMEMIT("- "); |
| 2850 | |
Joe Thornber | 3e1a069 | 2014-03-03 16:03:26 +0000 | [diff] [blame] | 2851 | if (pool->pf.mode == PM_OUT_OF_DATA_SPACE) |
| 2852 | DMEMIT("out_of_data_space "); |
| 2853 | else if (pool->pf.mode == PM_READ_ONLY) |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2854 | DMEMIT("ro "); |
| 2855 | else |
| 2856 | DMEMIT("rw "); |
| 2857 | |
Mike Snitzer | 018debe | 2012-12-21 20:23:32 +0000 | [diff] [blame] | 2858 | if (!pool->pf.discard_enabled) |
Mike Snitzer | 787a996c | 2013-12-06 16:21:43 -0500 | [diff] [blame] | 2859 | DMEMIT("ignore_discard "); |
Mike Snitzer | 018debe | 2012-12-21 20:23:32 +0000 | [diff] [blame] | 2860 | else if (pool->pf.discard_passdown) |
Mike Snitzer | 787a996c | 2013-12-06 16:21:43 -0500 | [diff] [blame] | 2861 | DMEMIT("discard_passdown "); |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 2862 | else |
Mike Snitzer | 787a996c | 2013-12-06 16:21:43 -0500 | [diff] [blame] | 2863 | DMEMIT("no_discard_passdown "); |
| 2864 | |
| 2865 | if (pool->pf.error_if_no_space) |
| 2866 | DMEMIT("error_if_no_space "); |
| 2867 | else |
| 2868 | DMEMIT("queue_if_no_space "); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2869 | |
| 2870 | break; |
| 2871 | |
| 2872 | case STATUSTYPE_TABLE: |
| 2873 | DMEMIT("%s %s %lu %llu ", |
| 2874 | format_dev_t(buf, pt->metadata_dev->bdev->bd_dev), |
| 2875 | format_dev_t(buf2, pt->data_dev->bdev->bd_dev), |
| 2876 | (unsigned long)pool->sectors_per_block, |
| 2877 | (unsigned long long)pt->low_water_blocks); |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2878 | emit_flags(&pt->requested_pf, result, sz, maxlen); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2879 | break; |
| 2880 | } |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2881 | return; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2882 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2883 | err: |
| 2884 | DMEMIT("Error"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2885 | } |
| 2886 | |
| 2887 | static int pool_iterate_devices(struct dm_target *ti, |
| 2888 | iterate_devices_callout_fn fn, void *data) |
| 2889 | { |
| 2890 | struct pool_c *pt = ti->private; |
| 2891 | |
| 2892 | return fn(ti, pt->data_dev, 0, ti->len, data); |
| 2893 | } |
| 2894 | |
| 2895 | static int pool_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
| 2896 | struct bio_vec *biovec, int max_size) |
| 2897 | { |
| 2898 | struct pool_c *pt = ti->private; |
| 2899 | struct request_queue *q = bdev_get_queue(pt->data_dev->bdev); |
| 2900 | |
| 2901 | if (!q->merge_bvec_fn) |
| 2902 | return max_size; |
| 2903 | |
| 2904 | bvm->bi_bdev = pt->data_dev->bdev; |
| 2905 | |
| 2906 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); |
| 2907 | } |
| 2908 | |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2909 | 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] | 2910 | { |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2911 | struct pool *pool = pt->pool; |
| 2912 | struct queue_limits *data_limits; |
| 2913 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2914 | limits->max_discard_sectors = pool->sectors_per_block; |
| 2915 | |
| 2916 | /* |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2917 | * discard_granularity is just a hint, and not enforced. |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2918 | */ |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2919 | if (pt->adjusted_pf.discard_passdown) { |
| 2920 | data_limits = &bdev_get_queue(pt->data_dev->bdev)->limits; |
| 2921 | limits->discard_granularity = data_limits->discard_granularity; |
Mike Snitzer | f13945d | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2922 | } else |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2923 | limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT; |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 2924 | } |
| 2925 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2926 | static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits) |
| 2927 | { |
| 2928 | struct pool_c *pt = ti->private; |
| 2929 | struct pool *pool = pt->pool; |
Mike Snitzer | 0cc67cd | 2013-08-20 15:02:41 -0400 | [diff] [blame] | 2930 | uint64_t io_opt_sectors = limits->io_opt >> SECTOR_SHIFT; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2931 | |
Mike Snitzer | 0cc67cd | 2013-08-20 15:02:41 -0400 | [diff] [blame] | 2932 | /* |
| 2933 | * If the system-determined stacked limits are compatible with the |
| 2934 | * pool's blocksize (io_opt is a factor) do not override them. |
| 2935 | */ |
| 2936 | if (io_opt_sectors < pool->sectors_per_block || |
| 2937 | do_div(io_opt_sectors, pool->sectors_per_block)) { |
| 2938 | blk_limits_io_min(limits, 0); |
| 2939 | blk_limits_io_opt(limits, pool->sectors_per_block << SECTOR_SHIFT); |
| 2940 | } |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2941 | |
| 2942 | /* |
| 2943 | * pt->adjusted_pf is a staging area for the actual features to use. |
| 2944 | * They get transferred to the live pool in bind_control_target() |
| 2945 | * called from pool_preresume(). |
| 2946 | */ |
Mike Snitzer | b60ab99 | 2013-09-19 18:49:11 -0400 | [diff] [blame] | 2947 | if (!pt->adjusted_pf.discard_enabled) { |
| 2948 | /* |
| 2949 | * Must explicitly disallow stacking discard limits otherwise the |
| 2950 | * block layer will stack them if pool's data device has support. |
| 2951 | * QUEUE_FLAG_DISCARD wouldn't be set but there is no way for the |
| 2952 | * user to see that, so make sure to set all discard limits to 0. |
| 2953 | */ |
| 2954 | limits->discard_granularity = 0; |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2955 | return; |
Mike Snitzer | b60ab99 | 2013-09-19 18:49:11 -0400 | [diff] [blame] | 2956 | } |
Mike Snitzer | 0424caa | 2012-09-26 23:45:47 +0100 | [diff] [blame] | 2957 | |
| 2958 | disable_passdown_if_not_supported(pt); |
| 2959 | |
| 2960 | set_discard_limits(pt, limits); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2961 | } |
| 2962 | |
| 2963 | static struct target_type pool_target = { |
| 2964 | .name = "thin-pool", |
| 2965 | .features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE | |
| 2966 | DM_TARGET_IMMUTABLE, |
Mike Snitzer | 07f2b6e | 2014-02-14 11:58:41 -0500 | [diff] [blame] | 2967 | .version = {1, 11, 0}, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2968 | .module = THIS_MODULE, |
| 2969 | .ctr = pool_ctr, |
| 2970 | .dtr = pool_dtr, |
| 2971 | .map = pool_map, |
| 2972 | .postsuspend = pool_postsuspend, |
| 2973 | .preresume = pool_preresume, |
| 2974 | .resume = pool_resume, |
| 2975 | .message = pool_message, |
| 2976 | .status = pool_status, |
| 2977 | .merge = pool_merge, |
| 2978 | .iterate_devices = pool_iterate_devices, |
| 2979 | .io_hints = pool_io_hints, |
| 2980 | }; |
| 2981 | |
| 2982 | /*---------------------------------------------------------------- |
| 2983 | * Thin target methods |
| 2984 | *--------------------------------------------------------------*/ |
| 2985 | static void thin_dtr(struct dm_target *ti) |
| 2986 | { |
| 2987 | struct thin_c *tc = ti->private; |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 2988 | unsigned long flags; |
| 2989 | |
| 2990 | spin_lock_irqsave(&tc->pool->lock, flags); |
| 2991 | list_del_rcu(&tc->list); |
| 2992 | spin_unlock_irqrestore(&tc->pool->lock, flags); |
| 2993 | synchronize_rcu(); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 2994 | |
| 2995 | mutex_lock(&dm_thin_pool_table.mutex); |
| 2996 | |
| 2997 | __pool_dec(tc->pool); |
| 2998 | dm_pool_close_thin_device(tc->td); |
| 2999 | dm_put_device(ti, tc->pool_dev); |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3000 | if (tc->origin_dev) |
| 3001 | dm_put_device(ti, tc->origin_dev); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3002 | kfree(tc); |
| 3003 | |
| 3004 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 3005 | } |
| 3006 | |
| 3007 | /* |
| 3008 | * Thin target parameters: |
| 3009 | * |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3010 | * <pool_dev> <dev_id> [origin_dev] |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3011 | * |
| 3012 | * pool_dev: the path to the pool (eg, /dev/mapper/my_pool) |
| 3013 | * dev_id: the internal device identifier |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3014 | * 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] | 3015 | * |
| 3016 | * If the pool device has discards disabled, they get disabled for the thin |
| 3017 | * device as well. |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3018 | */ |
| 3019 | static int thin_ctr(struct dm_target *ti, unsigned argc, char **argv) |
| 3020 | { |
| 3021 | int r; |
| 3022 | struct thin_c *tc; |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3023 | struct dm_dev *pool_dev, *origin_dev; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3024 | struct mapped_device *pool_md; |
| 3025 | |
| 3026 | mutex_lock(&dm_thin_pool_table.mutex); |
| 3027 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3028 | if (argc != 2 && argc != 3) { |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3029 | ti->error = "Invalid argument count"; |
| 3030 | r = -EINVAL; |
| 3031 | goto out_unlock; |
| 3032 | } |
| 3033 | |
| 3034 | tc = ti->private = kzalloc(sizeof(*tc), GFP_KERNEL); |
| 3035 | if (!tc) { |
| 3036 | ti->error = "Out of memory"; |
| 3037 | r = -ENOMEM; |
| 3038 | goto out_unlock; |
| 3039 | } |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 3040 | spin_lock_init(&tc->lock); |
| 3041 | bio_list_init(&tc->deferred_bio_list); |
| 3042 | bio_list_init(&tc->retry_on_resume_list); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3043 | |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3044 | if (argc == 3) { |
| 3045 | r = dm_get_device(ti, argv[2], FMODE_READ, &origin_dev); |
| 3046 | if (r) { |
| 3047 | ti->error = "Error opening origin device"; |
| 3048 | goto bad_origin_dev; |
| 3049 | } |
| 3050 | tc->origin_dev = origin_dev; |
| 3051 | } |
| 3052 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3053 | r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &pool_dev); |
| 3054 | if (r) { |
| 3055 | ti->error = "Error opening pool device"; |
| 3056 | goto bad_pool_dev; |
| 3057 | } |
| 3058 | tc->pool_dev = pool_dev; |
| 3059 | |
| 3060 | if (read_dev_id(argv[1], (unsigned long long *)&tc->dev_id, 0)) { |
| 3061 | ti->error = "Invalid device id"; |
| 3062 | r = -EINVAL; |
| 3063 | goto bad_common; |
| 3064 | } |
| 3065 | |
| 3066 | pool_md = dm_get_md(tc->pool_dev->bdev->bd_dev); |
| 3067 | if (!pool_md) { |
| 3068 | ti->error = "Couldn't get pool mapped device"; |
| 3069 | r = -EINVAL; |
| 3070 | goto bad_common; |
| 3071 | } |
| 3072 | |
| 3073 | tc->pool = __pool_table_lookup(pool_md); |
| 3074 | if (!tc->pool) { |
| 3075 | ti->error = "Couldn't find pool object"; |
| 3076 | r = -EINVAL; |
| 3077 | goto bad_pool_lookup; |
| 3078 | } |
| 3079 | __pool_inc(tc->pool); |
| 3080 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 3081 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
| 3082 | ti->error = "Couldn't open thin device, Pool is in fail mode"; |
Mike Snitzer | 1acacc0 | 2014-02-19 20:32:33 -0500 | [diff] [blame] | 3083 | r = -EINVAL; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 3084 | goto bad_thin_open; |
| 3085 | } |
| 3086 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3087 | r = dm_pool_open_thin_device(tc->pool->pmd, tc->dev_id, &tc->td); |
| 3088 | if (r) { |
| 3089 | ti->error = "Couldn't open thin internal device"; |
| 3090 | goto bad_thin_open; |
| 3091 | } |
| 3092 | |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 3093 | r = dm_set_target_max_io_len(ti, tc->pool->sectors_per_block); |
| 3094 | if (r) |
Mike Snitzer | 1acacc0 | 2014-02-19 20:32:33 -0500 | [diff] [blame] | 3095 | goto bad_target_max_io_len; |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 3096 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 3097 | ti->num_flush_bios = 1; |
Joe Thornber | 16ad3d1 | 2012-07-27 15:08:07 +0100 | [diff] [blame] | 3098 | ti->flush_supported = true; |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 3099 | ti->per_bio_data_size = sizeof(struct dm_thin_endio_hook); |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 3100 | |
| 3101 | /* In case the pool supports discards, pass them on. */ |
Mike Snitzer | b60ab99 | 2013-09-19 18:49:11 -0400 | [diff] [blame] | 3102 | ti->discard_zeroes_data_unsupported = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 3103 | if (tc->pool->pf.discard_enabled) { |
Alasdair G Kergon | 0ac5548 | 2012-07-27 15:08:08 +0100 | [diff] [blame] | 3104 | ti->discards_supported = true; |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 3105 | ti->num_discard_bios = 1; |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 3106 | /* Discard bios must be split on a block boundary */ |
| 3107 | ti->split_discard_bios = true; |
Joe Thornber | 67e2e2b | 2012-03-28 18:41:29 +0100 | [diff] [blame] | 3108 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3109 | |
| 3110 | dm_put(pool_md); |
| 3111 | |
| 3112 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 3113 | |
Mike Snitzer | c140e1c | 2014-03-20 21:17:14 -0400 | [diff] [blame^] | 3114 | spin_lock(&tc->pool->lock); |
| 3115 | list_add_tail_rcu(&tc->list, &tc->pool->active_thins); |
| 3116 | spin_unlock(&tc->pool->lock); |
| 3117 | /* |
| 3118 | * This synchronize_rcu() call is needed here otherwise we risk a |
| 3119 | * wake_worker() call finding no bios to process (because the newly |
| 3120 | * added tc isn't yet visible). So this reduces latency since we |
| 3121 | * aren't then dependent on the periodic commit to wake_worker(). |
| 3122 | */ |
| 3123 | synchronize_rcu(); |
| 3124 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3125 | return 0; |
| 3126 | |
Mike Snitzer | 1acacc0 | 2014-02-19 20:32:33 -0500 | [diff] [blame] | 3127 | bad_target_max_io_len: |
| 3128 | dm_pool_close_thin_device(tc->td); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3129 | bad_thin_open: |
| 3130 | __pool_dec(tc->pool); |
| 3131 | bad_pool_lookup: |
| 3132 | dm_put(pool_md); |
| 3133 | bad_common: |
| 3134 | dm_put_device(ti, tc->pool_dev); |
| 3135 | bad_pool_dev: |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3136 | if (tc->origin_dev) |
| 3137 | dm_put_device(ti, tc->origin_dev); |
| 3138 | bad_origin_dev: |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3139 | kfree(tc); |
| 3140 | out_unlock: |
| 3141 | mutex_unlock(&dm_thin_pool_table.mutex); |
| 3142 | |
| 3143 | return r; |
| 3144 | } |
| 3145 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 3146 | static int thin_map(struct dm_target *ti, struct bio *bio) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3147 | { |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 3148 | bio->bi_iter.bi_sector = dm_target_offset(ti, bio->bi_iter.bi_sector); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3149 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 3150 | return thin_bio_map(ti, bio); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3151 | } |
| 3152 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 3153 | 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] | 3154 | { |
| 3155 | unsigned long flags; |
Mikulas Patocka | 59c3d2c | 2012-12-21 20:23:40 +0000 | [diff] [blame] | 3156 | 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] | 3157 | struct list_head work; |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 3158 | struct dm_thin_new_mapping *m, *tmp; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3159 | struct pool *pool = h->tc->pool; |
| 3160 | |
| 3161 | if (h->shared_read_entry) { |
| 3162 | INIT_LIST_HEAD(&work); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 3163 | dm_deferred_entry_dec(h->shared_read_entry, &work); |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3164 | |
| 3165 | spin_lock_irqsave(&pool->lock, flags); |
| 3166 | list_for_each_entry_safe(m, tmp, &work, list) { |
| 3167 | list_del(&m->list); |
Mike Snitzer | 7f21466 | 2013-12-17 13:43:31 -0500 | [diff] [blame] | 3168 | m->quiesced = true; |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3169 | __maybe_add_mapping(m); |
| 3170 | } |
| 3171 | spin_unlock_irqrestore(&pool->lock, flags); |
| 3172 | } |
| 3173 | |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3174 | if (h->all_io_entry) { |
| 3175 | INIT_LIST_HEAD(&work); |
Mike Snitzer | 44feb38 | 2012-10-12 21:02:10 +0100 | [diff] [blame] | 3176 | dm_deferred_entry_dec(h->all_io_entry, &work); |
Joe Thornber | 563af18 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 3177 | if (!list_empty(&work)) { |
| 3178 | spin_lock_irqsave(&pool->lock, flags); |
| 3179 | list_for_each_entry_safe(m, tmp, &work, list) |
Mike Snitzer | daec338 | 2013-12-11 14:01:20 -0500 | [diff] [blame] | 3180 | list_add_tail(&m->list, &pool->prepared_discards); |
Joe Thornber | 563af18 | 2012-12-21 20:23:31 +0000 | [diff] [blame] | 3181 | spin_unlock_irqrestore(&pool->lock, flags); |
| 3182 | wake_worker(pool); |
| 3183 | } |
Joe Thornber | 104655f | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3184 | } |
| 3185 | |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3186 | return 0; |
| 3187 | } |
| 3188 | |
Joe Thornber | 738211f | 2014-03-03 15:52:28 +0000 | [diff] [blame] | 3189 | static void thin_presuspend(struct dm_target *ti) |
| 3190 | { |
| 3191 | struct thin_c *tc = ti->private; |
| 3192 | |
| 3193 | if (dm_noflush_suspending(ti)) |
| 3194 | noflush_work(tc, do_noflush_start); |
| 3195 | } |
| 3196 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3197 | static void thin_postsuspend(struct dm_target *ti) |
| 3198 | { |
Joe Thornber | 738211f | 2014-03-03 15:52:28 +0000 | [diff] [blame] | 3199 | struct thin_c *tc = ti->private; |
| 3200 | |
| 3201 | /* |
| 3202 | * The dm_noflush_suspending flag has been cleared by now, so |
| 3203 | * unfortunately we must always run this. |
| 3204 | */ |
| 3205 | noflush_work(tc, do_noflush_stop); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3206 | } |
| 3207 | |
| 3208 | /* |
| 3209 | * <nr mapped sectors> <highest mapped sector> |
| 3210 | */ |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 3211 | static void thin_status(struct dm_target *ti, status_type_t type, |
| 3212 | unsigned status_flags, char *result, unsigned maxlen) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3213 | { |
| 3214 | int r; |
| 3215 | ssize_t sz = 0; |
| 3216 | dm_block_t mapped, highest; |
| 3217 | char buf[BDEVNAME_SIZE]; |
| 3218 | struct thin_c *tc = ti->private; |
| 3219 | |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 3220 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
| 3221 | DMEMIT("Fail"); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 3222 | return; |
Joe Thornber | e49e582 | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 3223 | } |
| 3224 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3225 | if (!tc->td) |
| 3226 | DMEMIT("-"); |
| 3227 | else { |
| 3228 | switch (type) { |
| 3229 | case STATUSTYPE_INFO: |
| 3230 | r = dm_thin_get_mapped_count(tc->td, &mapped); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 3231 | if (r) { |
| 3232 | DMERR("dm_thin_get_mapped_count returned %d", r); |
| 3233 | goto err; |
| 3234 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3235 | |
| 3236 | r = dm_thin_get_highest_mapped_block(tc->td, &highest); |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 3237 | if (r < 0) { |
| 3238 | DMERR("dm_thin_get_highest_mapped_block returned %d", r); |
| 3239 | goto err; |
| 3240 | } |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3241 | |
| 3242 | DMEMIT("%llu ", mapped * tc->pool->sectors_per_block); |
| 3243 | if (r) |
| 3244 | DMEMIT("%llu", ((highest + 1) * |
| 3245 | tc->pool->sectors_per_block) - 1); |
| 3246 | else |
| 3247 | DMEMIT("-"); |
| 3248 | break; |
| 3249 | |
| 3250 | case STATUSTYPE_TABLE: |
| 3251 | DMEMIT("%s %lu", |
| 3252 | format_dev_t(buf, tc->pool_dev->bdev->bd_dev), |
| 3253 | (unsigned long) tc->dev_id); |
Joe Thornber | 2dd9c25 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3254 | if (tc->origin_dev) |
| 3255 | DMEMIT(" %s", format_dev_t(buf, tc->origin_dev->bdev->bd_dev)); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3256 | break; |
| 3257 | } |
| 3258 | } |
| 3259 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 3260 | return; |
| 3261 | |
| 3262 | err: |
| 3263 | DMEMIT("Error"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3264 | } |
| 3265 | |
| 3266 | static int thin_iterate_devices(struct dm_target *ti, |
| 3267 | iterate_devices_callout_fn fn, void *data) |
| 3268 | { |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 3269 | sector_t blocks; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3270 | struct thin_c *tc = ti->private; |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 3271 | struct pool *pool = tc->pool; |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3272 | |
| 3273 | /* |
| 3274 | * We can't call dm_pool_get_data_dev_size() since that blocks. So |
| 3275 | * we follow a more convoluted path through to the pool's target. |
| 3276 | */ |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 3277 | if (!pool->ti) |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3278 | return 0; /* nothing is bound */ |
| 3279 | |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 3280 | blocks = pool->ti->len; |
| 3281 | (void) sector_div(blocks, pool->sectors_per_block); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3282 | if (blocks) |
Mike Snitzer | 55f2b8b | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 3283 | 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] | 3284 | |
| 3285 | return 0; |
| 3286 | } |
| 3287 | |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3288 | static struct target_type thin_target = { |
| 3289 | .name = "thin", |
Mike Snitzer | 07f2b6e | 2014-02-14 11:58:41 -0500 | [diff] [blame] | 3290 | .version = {1, 11, 0}, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3291 | .module = THIS_MODULE, |
| 3292 | .ctr = thin_ctr, |
| 3293 | .dtr = thin_dtr, |
| 3294 | .map = thin_map, |
Joe Thornber | eb2aa48 | 2012-03-28 18:41:28 +0100 | [diff] [blame] | 3295 | .end_io = thin_endio, |
Joe Thornber | 738211f | 2014-03-03 15:52:28 +0000 | [diff] [blame] | 3296 | .presuspend = thin_presuspend, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3297 | .postsuspend = thin_postsuspend, |
| 3298 | .status = thin_status, |
| 3299 | .iterate_devices = thin_iterate_devices, |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3300 | }; |
| 3301 | |
| 3302 | /*----------------------------------------------------------------*/ |
| 3303 | |
| 3304 | static int __init dm_thin_init(void) |
| 3305 | { |
| 3306 | int r; |
| 3307 | |
| 3308 | pool_table_init(); |
| 3309 | |
| 3310 | r = dm_register_target(&thin_target); |
| 3311 | if (r) |
| 3312 | return r; |
| 3313 | |
| 3314 | r = dm_register_target(&pool_target); |
| 3315 | if (r) |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 3316 | goto bad_pool_target; |
| 3317 | |
| 3318 | r = -ENOMEM; |
| 3319 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 3320 | _new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, 0); |
| 3321 | if (!_new_mapping_cache) |
| 3322 | goto bad_new_mapping_cache; |
| 3323 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 3324 | return 0; |
| 3325 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 3326 | bad_new_mapping_cache: |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 3327 | dm_unregister_target(&pool_target); |
| 3328 | bad_pool_target: |
| 3329 | dm_unregister_target(&thin_target); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3330 | |
| 3331 | return r; |
| 3332 | } |
| 3333 | |
| 3334 | static void dm_thin_exit(void) |
| 3335 | { |
| 3336 | dm_unregister_target(&thin_target); |
| 3337 | dm_unregister_target(&pool_target); |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 3338 | |
Mike Snitzer | a24c256 | 2012-06-03 00:30:00 +0100 | [diff] [blame] | 3339 | kmem_cache_destroy(_new_mapping_cache); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3340 | } |
| 3341 | |
| 3342 | module_init(dm_thin_init); |
| 3343 | module_exit(dm_thin_exit); |
| 3344 | |
Alasdair G Kergon | 7cab8bf | 2012-05-12 01:43:19 +0100 | [diff] [blame] | 3345 | MODULE_DESCRIPTION(DM_NAME " thin provisioning target"); |
Joe Thornber | 991d9fa | 2011-10-31 20:21:18 +0000 | [diff] [blame] | 3346 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); |
| 3347 | MODULE_LICENSE("GPL"); |