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991d9fa0 | 1 | /* |
e49e5829 | 2 | * Copyright (C) 2011-2012 Red Hat UK. |
991d9fa0 JT |
3 | * |
4 | * This file is released under the GPL. | |
5 | */ | |
6 | ||
7 | #include "dm-thin-metadata.h" | |
742c8fdc | 8 | #include "dm-bio-prison-v1.h" |
1f4e0ff0 | 9 | #include "dm.h" |
991d9fa0 JT |
10 | |
11 | #include <linux/device-mapper.h> | |
12 | #include <linux/dm-io.h> | |
13 | #include <linux/dm-kcopyd.h> | |
0f30af98 | 14 | #include <linux/jiffies.h> |
604ea906 | 15 | #include <linux/log2.h> |
991d9fa0 | 16 | #include <linux/list.h> |
c140e1c4 | 17 | #include <linux/rculist.h> |
991d9fa0 JT |
18 | #include <linux/init.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/slab.h> | |
a822c83e | 21 | #include <linux/vmalloc.h> |
ac4c3f34 | 22 | #include <linux/sort.h> |
67324ea1 | 23 | #include <linux/rbtree.h> |
991d9fa0 JT |
24 | |
25 | #define DM_MSG_PREFIX "thin" | |
26 | ||
27 | /* | |
28 | * Tunable constants | |
29 | */ | |
7768ed33 | 30 | #define ENDIO_HOOK_POOL_SIZE 1024 |
991d9fa0 | 31 | #define MAPPING_POOL_SIZE 1024 |
905e51b3 | 32 | #define COMMIT_PERIOD HZ |
80c57893 MS |
33 | #define NO_SPACE_TIMEOUT_SECS 60 |
34 | ||
35 | static unsigned no_space_timeout_secs = NO_SPACE_TIMEOUT_SECS; | |
991d9fa0 | 36 | |
df5d2e90 MP |
37 | DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(snapshot_copy_throttle, |
38 | "A percentage of time allocated for copy on write"); | |
39 | ||
991d9fa0 JT |
40 | /* |
41 | * The block size of the device holding pool data must be | |
42 | * between 64KB and 1GB. | |
43 | */ | |
44 | #define DATA_DEV_BLOCK_SIZE_MIN_SECTORS (64 * 1024 >> SECTOR_SHIFT) | |
45 | #define DATA_DEV_BLOCK_SIZE_MAX_SECTORS (1024 * 1024 * 1024 >> SECTOR_SHIFT) | |
46 | ||
991d9fa0 JT |
47 | /* |
48 | * Device id is restricted to 24 bits. | |
49 | */ | |
50 | #define MAX_DEV_ID ((1 << 24) - 1) | |
51 | ||
52 | /* | |
53 | * How do we handle breaking sharing of data blocks? | |
54 | * ================================================= | |
55 | * | |
56 | * We use a standard copy-on-write btree to store the mappings for the | |
57 | * devices (note I'm talking about copy-on-write of the metadata here, not | |
58 | * the data). When you take an internal snapshot you clone the root node | |
59 | * of the origin btree. After this there is no concept of an origin or a | |
60 | * snapshot. They are just two device trees that happen to point to the | |
61 | * same data blocks. | |
62 | * | |
63 | * When we get a write in we decide if it's to a shared data block using | |
64 | * some timestamp magic. If it is, we have to break sharing. | |
65 | * | |
66 | * Let's say we write to a shared block in what was the origin. The | |
67 | * steps are: | |
68 | * | |
69 | * i) plug io further to this physical block. (see bio_prison code). | |
70 | * | |
71 | * ii) quiesce any read io to that shared data block. Obviously | |
44feb387 | 72 | * including all devices that share this block. (see dm_deferred_set code) |
991d9fa0 JT |
73 | * |
74 | * iii) copy the data block to a newly allocate block. This step can be | |
75 | * missed out if the io covers the block. (schedule_copy). | |
76 | * | |
77 | * iv) insert the new mapping into the origin's btree | |
fe878f34 | 78 | * (process_prepared_mapping). This act of inserting breaks some |
991d9fa0 JT |
79 | * sharing of btree nodes between the two devices. Breaking sharing only |
80 | * effects the btree of that specific device. Btrees for the other | |
81 | * devices that share the block never change. The btree for the origin | |
82 | * device as it was after the last commit is untouched, ie. we're using | |
83 | * persistent data structures in the functional programming sense. | |
84 | * | |
85 | * v) unplug io to this physical block, including the io that triggered | |
86 | * the breaking of sharing. | |
87 | * | |
88 | * Steps (ii) and (iii) occur in parallel. | |
89 | * | |
90 | * The metadata _doesn't_ need to be committed before the io continues. We | |
91 | * get away with this because the io is always written to a _new_ block. | |
92 | * If there's a crash, then: | |
93 | * | |
94 | * - The origin mapping will point to the old origin block (the shared | |
95 | * one). This will contain the data as it was before the io that triggered | |
96 | * the breaking of sharing came in. | |
97 | * | |
98 | * - The snap mapping still points to the old block. As it would after | |
99 | * the commit. | |
100 | * | |
101 | * The downside of this scheme is the timestamp magic isn't perfect, and | |
102 | * will continue to think that data block in the snapshot device is shared | |
103 | * even after the write to the origin has broken sharing. I suspect data | |
104 | * blocks will typically be shared by many different devices, so we're | |
105 | * breaking sharing n + 1 times, rather than n, where n is the number of | |
106 | * devices that reference this data block. At the moment I think the | |
107 | * benefits far, far outweigh the disadvantages. | |
108 | */ | |
109 | ||
110 | /*----------------------------------------------------------------*/ | |
111 | ||
991d9fa0 JT |
112 | /* |
113 | * Key building. | |
114 | */ | |
34fbcf62 JT |
115 | enum lock_space { |
116 | VIRTUAL, | |
117 | PHYSICAL | |
118 | }; | |
119 | ||
120 | static void build_key(struct dm_thin_device *td, enum lock_space ls, | |
121 | dm_block_t b, dm_block_t e, struct dm_cell_key *key) | |
991d9fa0 | 122 | { |
34fbcf62 | 123 | key->virtual = (ls == VIRTUAL); |
991d9fa0 | 124 | key->dev = dm_thin_dev_id(td); |
5f274d88 | 125 | key->block_begin = b; |
34fbcf62 JT |
126 | key->block_end = e; |
127 | } | |
128 | ||
129 | static void build_data_key(struct dm_thin_device *td, dm_block_t b, | |
130 | struct dm_cell_key *key) | |
131 | { | |
132 | build_key(td, PHYSICAL, b, b + 1llu, key); | |
991d9fa0 JT |
133 | } |
134 | ||
135 | static void build_virtual_key(struct dm_thin_device *td, dm_block_t b, | |
44feb387 | 136 | struct dm_cell_key *key) |
991d9fa0 | 137 | { |
34fbcf62 | 138 | build_key(td, VIRTUAL, b, b + 1llu, key); |
991d9fa0 JT |
139 | } |
140 | ||
141 | /*----------------------------------------------------------------*/ | |
142 | ||
7d327fe0 JT |
143 | #define THROTTLE_THRESHOLD (1 * HZ) |
144 | ||
145 | struct throttle { | |
146 | struct rw_semaphore lock; | |
147 | unsigned long threshold; | |
148 | bool throttle_applied; | |
149 | }; | |
150 | ||
151 | static void throttle_init(struct throttle *t) | |
152 | { | |
153 | init_rwsem(&t->lock); | |
154 | t->throttle_applied = false; | |
155 | } | |
156 | ||
157 | static void throttle_work_start(struct throttle *t) | |
158 | { | |
159 | t->threshold = jiffies + THROTTLE_THRESHOLD; | |
160 | } | |
161 | ||
162 | static void throttle_work_update(struct throttle *t) | |
163 | { | |
164 | if (!t->throttle_applied && jiffies > t->threshold) { | |
165 | down_write(&t->lock); | |
166 | t->throttle_applied = true; | |
167 | } | |
168 | } | |
169 | ||
170 | static void throttle_work_complete(struct throttle *t) | |
171 | { | |
172 | if (t->throttle_applied) { | |
173 | t->throttle_applied = false; | |
174 | up_write(&t->lock); | |
175 | } | |
176 | } | |
177 | ||
178 | static void throttle_lock(struct throttle *t) | |
179 | { | |
180 | down_read(&t->lock); | |
181 | } | |
182 | ||
183 | static void throttle_unlock(struct throttle *t) | |
184 | { | |
185 | up_read(&t->lock); | |
186 | } | |
187 | ||
188 | /*----------------------------------------------------------------*/ | |
189 | ||
991d9fa0 JT |
190 | /* |
191 | * A pool device ties together a metadata device and a data device. It | |
192 | * also provides the interface for creating and destroying internal | |
193 | * devices. | |
194 | */ | |
a24c2569 | 195 | struct dm_thin_new_mapping; |
67e2e2b2 | 196 | |
e49e5829 | 197 | /* |
36b67894 | 198 | * The pool runs in various modes. Ordered in degraded order for comparisons. |
e49e5829 JT |
199 | */ |
200 | enum pool_mode { | |
201 | PM_WRITE, /* metadata may be changed */ | |
3e1a0699 | 202 | PM_OUT_OF_DATA_SPACE, /* metadata may be changed, though data may not be allocated */ |
7e420796 JT |
203 | |
204 | /* | |
205 | * Like READ_ONLY, except may switch back to WRITE on metadata resize. Reported as READ_ONLY. | |
206 | */ | |
207 | PM_OUT_OF_METADATA_SPACE, | |
e49e5829 | 208 | PM_READ_ONLY, /* metadata may not be changed */ |
7e420796 | 209 | |
e49e5829 JT |
210 | PM_FAIL, /* all I/O fails */ |
211 | }; | |
212 | ||
67e2e2b2 | 213 | struct pool_features { |
e49e5829 JT |
214 | enum pool_mode mode; |
215 | ||
9bc142dd MS |
216 | bool zero_new_blocks:1; |
217 | bool discard_enabled:1; | |
218 | bool discard_passdown:1; | |
787a996c | 219 | bool error_if_no_space:1; |
67e2e2b2 JT |
220 | }; |
221 | ||
e49e5829 JT |
222 | struct thin_c; |
223 | typedef void (*process_bio_fn)(struct thin_c *tc, struct bio *bio); | |
a374bb21 | 224 | typedef void (*process_cell_fn)(struct thin_c *tc, struct dm_bio_prison_cell *cell); |
e49e5829 JT |
225 | typedef void (*process_mapping_fn)(struct dm_thin_new_mapping *m); |
226 | ||
ac4c3f34 JT |
227 | #define CELL_SORT_ARRAY_SIZE 8192 |
228 | ||
991d9fa0 JT |
229 | struct pool { |
230 | struct list_head list; | |
231 | struct dm_target *ti; /* Only set if a pool target is bound */ | |
232 | ||
233 | struct mapped_device *pool_md; | |
234 | struct block_device *md_dev; | |
235 | struct dm_pool_metadata *pmd; | |
236 | ||
991d9fa0 | 237 | dm_block_t low_water_blocks; |
55f2b8bd | 238 | uint32_t sectors_per_block; |
f9a8e0cd | 239 | int sectors_per_block_shift; |
991d9fa0 | 240 | |
67e2e2b2 | 241 | struct pool_features pf; |
88a6621b | 242 | bool low_water_triggered:1; /* A dm event has been sent */ |
80e96c54 | 243 | bool suspended:1; |
c3667cc6 | 244 | bool out_of_data_space:1; |
991d9fa0 | 245 | |
44feb387 | 246 | struct dm_bio_prison *prison; |
991d9fa0 JT |
247 | struct dm_kcopyd_client *copier; |
248 | ||
249 | struct workqueue_struct *wq; | |
7d327fe0 | 250 | struct throttle throttle; |
991d9fa0 | 251 | struct work_struct worker; |
905e51b3 | 252 | struct delayed_work waker; |
85ad643b | 253 | struct delayed_work no_space_timeout; |
991d9fa0 | 254 | |
905e51b3 | 255 | unsigned long last_commit_jiffies; |
55f2b8bd | 256 | unsigned ref_count; |
991d9fa0 JT |
257 | |
258 | spinlock_t lock; | |
991d9fa0 | 259 | struct bio_list deferred_flush_bios; |
e36827df | 260 | struct bio_list deferred_flush_completions; |
991d9fa0 | 261 | struct list_head prepared_mappings; |
104655fd | 262 | struct list_head prepared_discards; |
2a0fbffb | 263 | struct list_head prepared_discards_pt2; |
c140e1c4 | 264 | struct list_head active_thins; |
991d9fa0 | 265 | |
44feb387 MS |
266 | struct dm_deferred_set *shared_read_ds; |
267 | struct dm_deferred_set *all_io_ds; | |
991d9fa0 | 268 | |
a24c2569 | 269 | struct dm_thin_new_mapping *next_mapping; |
991d9fa0 | 270 | mempool_t *mapping_pool; |
e49e5829 JT |
271 | |
272 | process_bio_fn process_bio; | |
273 | process_bio_fn process_discard; | |
274 | ||
a374bb21 JT |
275 | process_cell_fn process_cell; |
276 | process_cell_fn process_discard_cell; | |
277 | ||
e49e5829 JT |
278 | process_mapping_fn process_prepared_mapping; |
279 | process_mapping_fn process_prepared_discard; | |
2a0fbffb | 280 | process_mapping_fn process_prepared_discard_pt2; |
ac4c3f34 | 281 | |
a822c83e | 282 | struct dm_bio_prison_cell **cell_sort_array; |
991d9fa0 JT |
283 | }; |
284 | ||
b5330655 | 285 | static void metadata_operation_failed(struct pool *pool, const char *op, int r); |
e49e5829 | 286 | |
36b67894 MS |
287 | static enum pool_mode get_pool_mode(struct pool *pool) |
288 | { | |
289 | return pool->pf.mode; | |
290 | } | |
291 | ||
292 | static void notify_of_pool_mode_change(struct pool *pool) | |
293 | { | |
294 | const char *descs[] = { | |
295 | "write", | |
296 | "out-of-data-space", | |
297 | "read-only", | |
298 | "read-only", | |
299 | "fail" | |
300 | }; | |
301 | const char *extra_desc = NULL; | |
302 | enum pool_mode mode = get_pool_mode(pool); | |
303 | ||
304 | if (mode == PM_OUT_OF_DATA_SPACE) { | |
305 | if (!pool->pf.error_if_no_space) | |
306 | extra_desc = " (queue IO)"; | |
307 | else | |
308 | extra_desc = " (error IO)"; | |
309 | } | |
310 | ||
311 | dm_table_event(pool->ti->table); | |
312 | DMINFO("%s: switching pool to %s%s mode", | |
313 | dm_device_name(pool->pool_md), | |
314 | descs[(int)mode], extra_desc ? : ""); | |
315 | } | |
316 | ||
991d9fa0 JT |
317 | /* |
318 | * Target context for a pool. | |
319 | */ | |
320 | struct pool_c { | |
321 | struct dm_target *ti; | |
322 | struct pool *pool; | |
323 | struct dm_dev *data_dev; | |
324 | struct dm_dev *metadata_dev; | |
325 | struct dm_target_callbacks callbacks; | |
326 | ||
327 | dm_block_t low_water_blocks; | |
0424caa1 MS |
328 | struct pool_features requested_pf; /* Features requested during table load */ |
329 | struct pool_features adjusted_pf; /* Features used after adjusting for constituent devices */ | |
991d9fa0 JT |
330 | }; |
331 | ||
332 | /* | |
333 | * Target context for a thin. | |
334 | */ | |
335 | struct thin_c { | |
c140e1c4 | 336 | struct list_head list; |
991d9fa0 | 337 | struct dm_dev *pool_dev; |
2dd9c257 | 338 | struct dm_dev *origin_dev; |
e5aea7b4 | 339 | sector_t origin_size; |
991d9fa0 JT |
340 | dm_thin_id dev_id; |
341 | ||
342 | struct pool *pool; | |
343 | struct dm_thin_device *td; | |
583024d2 MS |
344 | struct mapped_device *thin_md; |
345 | ||
738211f7 | 346 | bool requeue_mode:1; |
c140e1c4 | 347 | spinlock_t lock; |
a374bb21 | 348 | struct list_head deferred_cells; |
c140e1c4 MS |
349 | struct bio_list deferred_bio_list; |
350 | struct bio_list retry_on_resume_list; | |
67324ea1 | 351 | struct rb_root sort_bio_list; /* sorted list of deferred bios */ |
b10ebd34 JT |
352 | |
353 | /* | |
354 | * Ensures the thin is not destroyed until the worker has finished | |
355 | * iterating the active_thins list. | |
356 | */ | |
357 | atomic_t refcount; | |
358 | struct completion can_destroy; | |
991d9fa0 JT |
359 | }; |
360 | ||
361 | /*----------------------------------------------------------------*/ | |
362 | ||
34fbcf62 JT |
363 | static bool block_size_is_power_of_two(struct pool *pool) |
364 | { | |
365 | return pool->sectors_per_block_shift >= 0; | |
366 | } | |
367 | ||
368 | static sector_t block_to_sectors(struct pool *pool, dm_block_t b) | |
369 | { | |
370 | return block_size_is_power_of_two(pool) ? | |
371 | (b << pool->sectors_per_block_shift) : | |
372 | (b * pool->sectors_per_block); | |
373 | } | |
374 | ||
202bae52 JT |
375 | /*----------------------------------------------------------------*/ |
376 | ||
377 | struct discard_op { | |
378 | struct thin_c *tc; | |
379 | struct blk_plug plug; | |
380 | struct bio *parent_bio; | |
381 | struct bio *bio; | |
382 | }; | |
383 | ||
384 | static void begin_discard(struct discard_op *op, struct thin_c *tc, struct bio *parent) | |
385 | { | |
386 | BUG_ON(!parent); | |
387 | ||
388 | op->tc = tc; | |
389 | blk_start_plug(&op->plug); | |
390 | op->parent_bio = parent; | |
391 | op->bio = NULL; | |
392 | } | |
393 | ||
394 | static int issue_discard(struct discard_op *op, dm_block_t data_b, dm_block_t data_e) | |
34fbcf62 | 395 | { |
202bae52 | 396 | struct thin_c *tc = op->tc; |
34fbcf62 JT |
397 | sector_t s = block_to_sectors(tc->pool, data_b); |
398 | sector_t len = block_to_sectors(tc->pool, data_e - data_b); | |
3dba53a9 | 399 | |
202bae52 | 400 | return __blkdev_issue_discard(tc->pool_dev->bdev, s, len, |
469e3216 | 401 | GFP_NOWAIT, 0, &op->bio); |
202bae52 JT |
402 | } |
403 | ||
404 | static void end_discard(struct discard_op *op, int r) | |
405 | { | |
406 | if (op->bio) { | |
407 | /* | |
408 | * Even if one of the calls to issue_discard failed, we | |
409 | * need to wait for the chain to complete. | |
410 | */ | |
411 | bio_chain(op->bio, op->parent_bio); | |
e6047149 | 412 | bio_set_op_attrs(op->bio, REQ_OP_DISCARD, 0); |
4e49ea4a | 413 | submit_bio(op->bio); |
3dba53a9 | 414 | } |
34fbcf62 | 415 | |
202bae52 JT |
416 | blk_finish_plug(&op->plug); |
417 | ||
418 | /* | |
419 | * Even if r is set, there could be sub discards in flight that we | |
420 | * need to wait for. | |
421 | */ | |
4e4cbee9 CH |
422 | if (r && !op->parent_bio->bi_status) |
423 | op->parent_bio->bi_status = errno_to_blk_status(r); | |
202bae52 | 424 | bio_endio(op->parent_bio); |
34fbcf62 JT |
425 | } |
426 | ||
427 | /*----------------------------------------------------------------*/ | |
428 | ||
025b9685 JT |
429 | /* |
430 | * wake_worker() is used when new work is queued and when pool_resume is | |
431 | * ready to continue deferred IO processing. | |
432 | */ | |
433 | static void wake_worker(struct pool *pool) | |
434 | { | |
435 | queue_work(pool->wq, &pool->worker); | |
436 | } | |
437 | ||
438 | /*----------------------------------------------------------------*/ | |
439 | ||
6beca5eb JT |
440 | static int bio_detain(struct pool *pool, struct dm_cell_key *key, struct bio *bio, |
441 | struct dm_bio_prison_cell **cell_result) | |
442 | { | |
443 | int r; | |
444 | struct dm_bio_prison_cell *cell_prealloc; | |
445 | ||
446 | /* | |
447 | * Allocate a cell from the prison's mempool. | |
448 | * This might block but it can't fail. | |
449 | */ | |
450 | cell_prealloc = dm_bio_prison_alloc_cell(pool->prison, GFP_NOIO); | |
451 | ||
452 | r = dm_bio_detain(pool->prison, key, bio, cell_prealloc, cell_result); | |
453 | if (r) | |
454 | /* | |
455 | * We reused an old cell; we can get rid of | |
456 | * the new one. | |
457 | */ | |
458 | dm_bio_prison_free_cell(pool->prison, cell_prealloc); | |
459 | ||
460 | return r; | |
461 | } | |
462 | ||
463 | static void cell_release(struct pool *pool, | |
464 | struct dm_bio_prison_cell *cell, | |
465 | struct bio_list *bios) | |
466 | { | |
467 | dm_cell_release(pool->prison, cell, bios); | |
468 | dm_bio_prison_free_cell(pool->prison, cell); | |
469 | } | |
470 | ||
2d759a46 JT |
471 | static void cell_visit_release(struct pool *pool, |
472 | void (*fn)(void *, struct dm_bio_prison_cell *), | |
473 | void *context, | |
474 | struct dm_bio_prison_cell *cell) | |
475 | { | |
476 | dm_cell_visit_release(pool->prison, fn, context, cell); | |
477 | dm_bio_prison_free_cell(pool->prison, cell); | |
478 | } | |
479 | ||
6beca5eb JT |
480 | static void cell_release_no_holder(struct pool *pool, |
481 | struct dm_bio_prison_cell *cell, | |
482 | struct bio_list *bios) | |
483 | { | |
484 | dm_cell_release_no_holder(pool->prison, cell, bios); | |
485 | dm_bio_prison_free_cell(pool->prison, cell); | |
486 | } | |
487 | ||
af91805a | 488 | static void cell_error_with_code(struct pool *pool, |
4e4cbee9 | 489 | struct dm_bio_prison_cell *cell, blk_status_t error_code) |
6beca5eb | 490 | { |
af91805a | 491 | dm_cell_error(pool->prison, cell, error_code); |
6beca5eb JT |
492 | dm_bio_prison_free_cell(pool->prison, cell); |
493 | } | |
494 | ||
4e4cbee9 | 495 | static blk_status_t get_pool_io_error_code(struct pool *pool) |
c3667cc6 | 496 | { |
4e4cbee9 | 497 | return pool->out_of_data_space ? BLK_STS_NOSPC : BLK_STS_IOERR; |
c3667cc6 MS |
498 | } |
499 | ||
af91805a MS |
500 | static void cell_error(struct pool *pool, struct dm_bio_prison_cell *cell) |
501 | { | |
4e4cbee9 | 502 | cell_error_with_code(pool, cell, get_pool_io_error_code(pool)); |
af91805a MS |
503 | } |
504 | ||
a374bb21 JT |
505 | static void cell_success(struct pool *pool, struct dm_bio_prison_cell *cell) |
506 | { | |
507 | cell_error_with_code(pool, cell, 0); | |
508 | } | |
509 | ||
510 | static void cell_requeue(struct pool *pool, struct dm_bio_prison_cell *cell) | |
511 | { | |
4e4cbee9 | 512 | cell_error_with_code(pool, cell, BLK_STS_DM_REQUEUE); |
a374bb21 JT |
513 | } |
514 | ||
6beca5eb JT |
515 | /*----------------------------------------------------------------*/ |
516 | ||
991d9fa0 JT |
517 | /* |
518 | * A global list of pools that uses a struct mapped_device as a key. | |
519 | */ | |
520 | static struct dm_thin_pool_table { | |
521 | struct mutex mutex; | |
522 | struct list_head pools; | |
523 | } dm_thin_pool_table; | |
524 | ||
525 | static void pool_table_init(void) | |
526 | { | |
527 | mutex_init(&dm_thin_pool_table.mutex); | |
528 | INIT_LIST_HEAD(&dm_thin_pool_table.pools); | |
529 | } | |
530 | ||
531 | static void __pool_table_insert(struct pool *pool) | |
532 | { | |
533 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); | |
534 | list_add(&pool->list, &dm_thin_pool_table.pools); | |
535 | } | |
536 | ||
537 | static void __pool_table_remove(struct pool *pool) | |
538 | { | |
539 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); | |
540 | list_del(&pool->list); | |
541 | } | |
542 | ||
543 | static struct pool *__pool_table_lookup(struct mapped_device *md) | |
544 | { | |
545 | struct pool *pool = NULL, *tmp; | |
546 | ||
547 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); | |
548 | ||
549 | list_for_each_entry(tmp, &dm_thin_pool_table.pools, list) { | |
550 | if (tmp->pool_md == md) { | |
551 | pool = tmp; | |
552 | break; | |
553 | } | |
554 | } | |
555 | ||
556 | return pool; | |
557 | } | |
558 | ||
559 | static struct pool *__pool_table_lookup_metadata_dev(struct block_device *md_dev) | |
560 | { | |
561 | struct pool *pool = NULL, *tmp; | |
562 | ||
563 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); | |
564 | ||
565 | list_for_each_entry(tmp, &dm_thin_pool_table.pools, list) { | |
566 | if (tmp->md_dev == md_dev) { | |
567 | pool = tmp; | |
568 | break; | |
569 | } | |
570 | } | |
571 | ||
572 | return pool; | |
573 | } | |
574 | ||
575 | /*----------------------------------------------------------------*/ | |
576 | ||
a24c2569 | 577 | struct dm_thin_endio_hook { |
eb2aa48d | 578 | struct thin_c *tc; |
44feb387 MS |
579 | struct dm_deferred_entry *shared_read_entry; |
580 | struct dm_deferred_entry *all_io_entry; | |
a24c2569 | 581 | struct dm_thin_new_mapping *overwrite_mapping; |
67324ea1 | 582 | struct rb_node rb_node; |
34fbcf62 | 583 | struct dm_bio_prison_cell *cell; |
eb2aa48d JT |
584 | }; |
585 | ||
42d6a8ce MS |
586 | static void __merge_bio_list(struct bio_list *bios, struct bio_list *master) |
587 | { | |
588 | bio_list_merge(bios, master); | |
589 | bio_list_init(master); | |
590 | } | |
591 | ||
4e4cbee9 | 592 | static void error_bio_list(struct bio_list *bios, blk_status_t error) |
991d9fa0 JT |
593 | { |
594 | struct bio *bio; | |
42d6a8ce | 595 | |
4246a0b6 | 596 | while ((bio = bio_list_pop(bios))) { |
4e4cbee9 | 597 | bio->bi_status = error; |
4246a0b6 CH |
598 | bio_endio(bio); |
599 | } | |
42d6a8ce MS |
600 | } |
601 | ||
4e4cbee9 CH |
602 | static void error_thin_bio_list(struct thin_c *tc, struct bio_list *master, |
603 | blk_status_t error) | |
42d6a8ce | 604 | { |
991d9fa0 | 605 | struct bio_list bios; |
18adc577 | 606 | unsigned long flags; |
991d9fa0 JT |
607 | |
608 | bio_list_init(&bios); | |
18adc577 | 609 | |
c140e1c4 | 610 | spin_lock_irqsave(&tc->lock, flags); |
42d6a8ce | 611 | __merge_bio_list(&bios, master); |
c140e1c4 | 612 | spin_unlock_irqrestore(&tc->lock, flags); |
991d9fa0 | 613 | |
42d6a8ce | 614 | error_bio_list(&bios, error); |
991d9fa0 JT |
615 | } |
616 | ||
a374bb21 JT |
617 | static void requeue_deferred_cells(struct thin_c *tc) |
618 | { | |
619 | struct pool *pool = tc->pool; | |
620 | unsigned long flags; | |
621 | struct list_head cells; | |
622 | struct dm_bio_prison_cell *cell, *tmp; | |
623 | ||
624 | INIT_LIST_HEAD(&cells); | |
625 | ||
626 | spin_lock_irqsave(&tc->lock, flags); | |
627 | list_splice_init(&tc->deferred_cells, &cells); | |
628 | spin_unlock_irqrestore(&tc->lock, flags); | |
629 | ||
630 | list_for_each_entry_safe(cell, tmp, &cells, user_list) | |
631 | cell_requeue(pool, cell); | |
632 | } | |
633 | ||
991d9fa0 JT |
634 | static void requeue_io(struct thin_c *tc) |
635 | { | |
3e1a0699 | 636 | struct bio_list bios; |
42d6a8ce | 637 | unsigned long flags; |
3e1a0699 JT |
638 | |
639 | bio_list_init(&bios); | |
640 | ||
c140e1c4 | 641 | spin_lock_irqsave(&tc->lock, flags); |
42d6a8ce MS |
642 | __merge_bio_list(&bios, &tc->deferred_bio_list); |
643 | __merge_bio_list(&bios, &tc->retry_on_resume_list); | |
c140e1c4 | 644 | spin_unlock_irqrestore(&tc->lock, flags); |
3e1a0699 | 645 | |
4e4cbee9 | 646 | error_bio_list(&bios, BLK_STS_DM_REQUEUE); |
42d6a8ce | 647 | requeue_deferred_cells(tc); |
3e1a0699 JT |
648 | } |
649 | ||
4e4cbee9 | 650 | static void error_retry_list_with_code(struct pool *pool, blk_status_t error) |
c140e1c4 MS |
651 | { |
652 | struct thin_c *tc; | |
653 | ||
654 | rcu_read_lock(); | |
655 | list_for_each_entry_rcu(tc, &pool->active_thins, list) | |
0a927c2f | 656 | error_thin_bio_list(tc, &tc->retry_on_resume_list, error); |
c140e1c4 MS |
657 | rcu_read_unlock(); |
658 | } | |
659 | ||
0a927c2f MS |
660 | static void error_retry_list(struct pool *pool) |
661 | { | |
4e4cbee9 | 662 | error_retry_list_with_code(pool, get_pool_io_error_code(pool)); |
0a927c2f MS |
663 | } |
664 | ||
991d9fa0 JT |
665 | /* |
666 | * This section of code contains the logic for processing a thin device's IO. | |
667 | * Much of the code depends on pool object resources (lists, workqueues, etc) | |
668 | * but most is exclusively called from the thin target rather than the thin-pool | |
669 | * target. | |
670 | */ | |
671 | ||
672 | static dm_block_t get_bio_block(struct thin_c *tc, struct bio *bio) | |
673 | { | |
58f77a21 | 674 | struct pool *pool = tc->pool; |
4f024f37 | 675 | sector_t block_nr = bio->bi_iter.bi_sector; |
55f2b8bd | 676 | |
58f77a21 MS |
677 | if (block_size_is_power_of_two(pool)) |
678 | block_nr >>= pool->sectors_per_block_shift; | |
f9a8e0cd | 679 | else |
58f77a21 | 680 | (void) sector_div(block_nr, pool->sectors_per_block); |
55f2b8bd MS |
681 | |
682 | return block_nr; | |
991d9fa0 JT |
683 | } |
684 | ||
34fbcf62 JT |
685 | /* |
686 | * Returns the _complete_ blocks that this bio covers. | |
687 | */ | |
688 | static void get_bio_block_range(struct thin_c *tc, struct bio *bio, | |
689 | dm_block_t *begin, dm_block_t *end) | |
690 | { | |
691 | struct pool *pool = tc->pool; | |
692 | sector_t b = bio->bi_iter.bi_sector; | |
693 | sector_t e = b + (bio->bi_iter.bi_size >> SECTOR_SHIFT); | |
694 | ||
695 | b += pool->sectors_per_block - 1ull; /* so we round up */ | |
696 | ||
697 | if (block_size_is_power_of_two(pool)) { | |
698 | b >>= pool->sectors_per_block_shift; | |
699 | e >>= pool->sectors_per_block_shift; | |
700 | } else { | |
701 | (void) sector_div(b, pool->sectors_per_block); | |
702 | (void) sector_div(e, pool->sectors_per_block); | |
703 | } | |
704 | ||
705 | if (e < b) | |
706 | /* Can happen if the bio is within a single block. */ | |
707 | e = b; | |
708 | ||
709 | *begin = b; | |
710 | *end = e; | |
711 | } | |
712 | ||
991d9fa0 JT |
713 | static void remap(struct thin_c *tc, struct bio *bio, dm_block_t block) |
714 | { | |
715 | struct pool *pool = tc->pool; | |
4f024f37 | 716 | sector_t bi_sector = bio->bi_iter.bi_sector; |
991d9fa0 | 717 | |
74d46992 | 718 | bio_set_dev(bio, tc->pool_dev->bdev); |
58f77a21 | 719 | if (block_size_is_power_of_two(pool)) |
4f024f37 KO |
720 | bio->bi_iter.bi_sector = |
721 | (block << pool->sectors_per_block_shift) | | |
722 | (bi_sector & (pool->sectors_per_block - 1)); | |
58f77a21 | 723 | else |
4f024f37 | 724 | bio->bi_iter.bi_sector = (block * pool->sectors_per_block) + |
58f77a21 | 725 | sector_div(bi_sector, pool->sectors_per_block); |
991d9fa0 JT |
726 | } |
727 | ||
2dd9c257 JT |
728 | static void remap_to_origin(struct thin_c *tc, struct bio *bio) |
729 | { | |
74d46992 | 730 | bio_set_dev(bio, tc->origin_dev->bdev); |
2dd9c257 JT |
731 | } |
732 | ||
4afdd680 JT |
733 | static int bio_triggers_commit(struct thin_c *tc, struct bio *bio) |
734 | { | |
f73f44eb | 735 | return op_is_flush(bio->bi_opf) && |
4afdd680 JT |
736 | dm_thin_changed_this_transaction(tc->td); |
737 | } | |
738 | ||
e8088073 JT |
739 | static void inc_all_io_entry(struct pool *pool, struct bio *bio) |
740 | { | |
741 | struct dm_thin_endio_hook *h; | |
742 | ||
e6047149 | 743 | if (bio_op(bio) == REQ_OP_DISCARD) |
e8088073 JT |
744 | return; |
745 | ||
59c3d2c6 | 746 | h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
e8088073 JT |
747 | h->all_io_entry = dm_deferred_entry_inc(pool->all_io_ds); |
748 | } | |
749 | ||
2dd9c257 | 750 | static void issue(struct thin_c *tc, struct bio *bio) |
991d9fa0 JT |
751 | { |
752 | struct pool *pool = tc->pool; | |
753 | unsigned long flags; | |
754 | ||
e49e5829 JT |
755 | if (!bio_triggers_commit(tc, bio)) { |
756 | generic_make_request(bio); | |
757 | return; | |
758 | } | |
759 | ||
991d9fa0 | 760 | /* |
e49e5829 JT |
761 | * Complete bio with an error if earlier I/O caused changes to |
762 | * the metadata that can't be committed e.g, due to I/O errors | |
763 | * on the metadata device. | |
991d9fa0 | 764 | */ |
e49e5829 JT |
765 | if (dm_thin_aborted_changes(tc->td)) { |
766 | bio_io_error(bio); | |
767 | return; | |
768 | } | |
769 | ||
770 | /* | |
771 | * Batch together any bios that trigger commits and then issue a | |
772 | * single commit for them in process_deferred_bios(). | |
773 | */ | |
774 | spin_lock_irqsave(&pool->lock, flags); | |
775 | bio_list_add(&pool->deferred_flush_bios, bio); | |
776 | spin_unlock_irqrestore(&pool->lock, flags); | |
991d9fa0 JT |
777 | } |
778 | ||
2dd9c257 JT |
779 | static void remap_to_origin_and_issue(struct thin_c *tc, struct bio *bio) |
780 | { | |
781 | remap_to_origin(tc, bio); | |
782 | issue(tc, bio); | |
783 | } | |
784 | ||
785 | static void remap_and_issue(struct thin_c *tc, struct bio *bio, | |
786 | dm_block_t block) | |
787 | { | |
788 | remap(tc, bio, block); | |
789 | issue(tc, bio); | |
790 | } | |
791 | ||
991d9fa0 JT |
792 | /*----------------------------------------------------------------*/ |
793 | ||
794 | /* | |
795 | * Bio endio functions. | |
796 | */ | |
a24c2569 | 797 | struct dm_thin_new_mapping { |
991d9fa0 JT |
798 | struct list_head list; |
799 | ||
7f214665 | 800 | bool pass_discard:1; |
34fbcf62 | 801 | bool maybe_shared:1; |
991d9fa0 | 802 | |
50f3c3ef JT |
803 | /* |
804 | * Track quiescing, copying and zeroing preparation actions. When this | |
805 | * counter hits zero the block is prepared and can be inserted into the | |
806 | * btree. | |
807 | */ | |
808 | atomic_t prepare_actions; | |
809 | ||
4e4cbee9 | 810 | blk_status_t status; |
991d9fa0 | 811 | struct thin_c *tc; |
34fbcf62 | 812 | dm_block_t virt_begin, virt_end; |
991d9fa0 | 813 | dm_block_t data_block; |
34fbcf62 | 814 | struct dm_bio_prison_cell *cell; |
991d9fa0 JT |
815 | |
816 | /* | |
817 | * If the bio covers the whole area of a block then we can avoid | |
818 | * zeroing or copying. Instead this bio is hooked. The bio will | |
819 | * still be in the cell, so care has to be taken to avoid issuing | |
820 | * the bio twice. | |
821 | */ | |
822 | struct bio *bio; | |
823 | bio_end_io_t *saved_bi_end_io; | |
824 | }; | |
825 | ||
50f3c3ef | 826 | static void __complete_mapping_preparation(struct dm_thin_new_mapping *m) |
991d9fa0 JT |
827 | { |
828 | struct pool *pool = m->tc->pool; | |
829 | ||
50f3c3ef | 830 | if (atomic_dec_and_test(&m->prepare_actions)) { |
daec338b | 831 | list_add_tail(&m->list, &pool->prepared_mappings); |
991d9fa0 JT |
832 | wake_worker(pool); |
833 | } | |
834 | } | |
835 | ||
e5aea7b4 | 836 | static void complete_mapping_preparation(struct dm_thin_new_mapping *m) |
991d9fa0 JT |
837 | { |
838 | unsigned long flags; | |
991d9fa0 JT |
839 | struct pool *pool = m->tc->pool; |
840 | ||
991d9fa0 | 841 | spin_lock_irqsave(&pool->lock, flags); |
50f3c3ef | 842 | __complete_mapping_preparation(m); |
991d9fa0 JT |
843 | spin_unlock_irqrestore(&pool->lock, flags); |
844 | } | |
845 | ||
e5aea7b4 JT |
846 | static void copy_complete(int read_err, unsigned long write_err, void *context) |
847 | { | |
848 | struct dm_thin_new_mapping *m = context; | |
849 | ||
4e4cbee9 | 850 | m->status = read_err || write_err ? BLK_STS_IOERR : 0; |
e5aea7b4 JT |
851 | complete_mapping_preparation(m); |
852 | } | |
853 | ||
4246a0b6 | 854 | static void overwrite_endio(struct bio *bio) |
991d9fa0 | 855 | { |
59c3d2c6 | 856 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
a24c2569 | 857 | struct dm_thin_new_mapping *m = h->overwrite_mapping; |
991d9fa0 | 858 | |
8b908f8e MS |
859 | bio->bi_end_io = m->saved_bi_end_io; |
860 | ||
4e4cbee9 | 861 | m->status = bio->bi_status; |
e5aea7b4 | 862 | complete_mapping_preparation(m); |
991d9fa0 JT |
863 | } |
864 | ||
991d9fa0 JT |
865 | /*----------------------------------------------------------------*/ |
866 | ||
867 | /* | |
868 | * Workqueue. | |
869 | */ | |
870 | ||
871 | /* | |
872 | * Prepared mapping jobs. | |
873 | */ | |
874 | ||
875 | /* | |
2d759a46 JT |
876 | * This sends the bios in the cell, except the original holder, back |
877 | * to the deferred_bios list. | |
991d9fa0 | 878 | */ |
f286ba0e | 879 | static void cell_defer_no_holder(struct thin_c *tc, struct dm_bio_prison_cell *cell) |
991d9fa0 | 880 | { |
991d9fa0 JT |
881 | struct pool *pool = tc->pool; |
882 | unsigned long flags; | |
883 | ||
c140e1c4 MS |
884 | spin_lock_irqsave(&tc->lock, flags); |
885 | cell_release_no_holder(pool, cell, &tc->deferred_bio_list); | |
886 | spin_unlock_irqrestore(&tc->lock, flags); | |
991d9fa0 JT |
887 | |
888 | wake_worker(pool); | |
889 | } | |
890 | ||
a374bb21 JT |
891 | static void thin_defer_bio(struct thin_c *tc, struct bio *bio); |
892 | ||
2d759a46 JT |
893 | struct remap_info { |
894 | struct thin_c *tc; | |
895 | struct bio_list defer_bios; | |
896 | struct bio_list issue_bios; | |
897 | }; | |
898 | ||
899 | static void __inc_remap_and_issue_cell(void *context, | |
900 | struct dm_bio_prison_cell *cell) | |
a374bb21 | 901 | { |
2d759a46 | 902 | struct remap_info *info = context; |
a374bb21 | 903 | struct bio *bio; |
a374bb21 | 904 | |
2d759a46 | 905 | while ((bio = bio_list_pop(&cell->bios))) { |
f73f44eb | 906 | if (op_is_flush(bio->bi_opf) || bio_op(bio) == REQ_OP_DISCARD) |
2d759a46 | 907 | bio_list_add(&info->defer_bios, bio); |
a374bb21 | 908 | else { |
2d759a46 JT |
909 | inc_all_io_entry(info->tc->pool, bio); |
910 | ||
911 | /* | |
912 | * We can't issue the bios with the bio prison lock | |
913 | * held, so we add them to a list to issue on | |
914 | * return from this function. | |
915 | */ | |
916 | bio_list_add(&info->issue_bios, bio); | |
a374bb21 JT |
917 | } |
918 | } | |
919 | } | |
920 | ||
2d759a46 JT |
921 | static void inc_remap_and_issue_cell(struct thin_c *tc, |
922 | struct dm_bio_prison_cell *cell, | |
923 | dm_block_t block) | |
924 | { | |
925 | struct bio *bio; | |
926 | struct remap_info info; | |
927 | ||
928 | info.tc = tc; | |
929 | bio_list_init(&info.defer_bios); | |
930 | bio_list_init(&info.issue_bios); | |
931 | ||
932 | /* | |
933 | * We have to be careful to inc any bios we're about to issue | |
934 | * before the cell is released, and avoid a race with new bios | |
935 | * being added to the cell. | |
936 | */ | |
937 | cell_visit_release(tc->pool, __inc_remap_and_issue_cell, | |
938 | &info, cell); | |
939 | ||
940 | while ((bio = bio_list_pop(&info.defer_bios))) | |
941 | thin_defer_bio(tc, bio); | |
942 | ||
943 | while ((bio = bio_list_pop(&info.issue_bios))) | |
944 | remap_and_issue(info.tc, bio, block); | |
945 | } | |
946 | ||
e49e5829 JT |
947 | static void process_prepared_mapping_fail(struct dm_thin_new_mapping *m) |
948 | { | |
6beca5eb | 949 | cell_error(m->tc->pool, m->cell); |
e49e5829 JT |
950 | list_del(&m->list); |
951 | mempool_free(m, m->tc->pool->mapping_pool); | |
952 | } | |
025b9685 | 953 | |
e36827df NT |
954 | static void complete_overwrite_bio(struct thin_c *tc, struct bio *bio) |
955 | { | |
956 | struct pool *pool = tc->pool; | |
957 | unsigned long flags; | |
958 | ||
959 | /* | |
960 | * If the bio has the REQ_FUA flag set we must commit the metadata | |
961 | * before signaling its completion. | |
962 | */ | |
963 | if (!bio_triggers_commit(tc, bio)) { | |
964 | bio_endio(bio); | |
965 | return; | |
966 | } | |
967 | ||
968 | /* | |
969 | * Complete bio with an error if earlier I/O caused changes to the | |
970 | * metadata that can't be committed, e.g, due to I/O errors on the | |
971 | * metadata device. | |
972 | */ | |
973 | if (dm_thin_aborted_changes(tc->td)) { | |
974 | bio_io_error(bio); | |
975 | return; | |
976 | } | |
977 | ||
978 | /* | |
979 | * Batch together any bios that trigger commits and then issue a | |
980 | * single commit for them in process_deferred_bios(). | |
981 | */ | |
982 | spin_lock_irqsave(&pool->lock, flags); | |
983 | bio_list_add(&pool->deferred_flush_completions, bio); | |
984 | spin_unlock_irqrestore(&pool->lock, flags); | |
985 | } | |
986 | ||
a24c2569 | 987 | static void process_prepared_mapping(struct dm_thin_new_mapping *m) |
991d9fa0 JT |
988 | { |
989 | struct thin_c *tc = m->tc; | |
6beca5eb | 990 | struct pool *pool = tc->pool; |
8b908f8e | 991 | struct bio *bio = m->bio; |
991d9fa0 JT |
992 | int r; |
993 | ||
4e4cbee9 | 994 | if (m->status) { |
6beca5eb | 995 | cell_error(pool, m->cell); |
905386f8 | 996 | goto out; |
991d9fa0 JT |
997 | } |
998 | ||
999 | /* | |
1000 | * Commit the prepared block into the mapping btree. | |
1001 | * Any I/O for this block arriving after this point will get | |
1002 | * remapped to it directly. | |
1003 | */ | |
34fbcf62 | 1004 | r = dm_thin_insert_block(tc->td, m->virt_begin, m->data_block); |
991d9fa0 | 1005 | if (r) { |
b5330655 | 1006 | metadata_operation_failed(pool, "dm_thin_insert_block", r); |
6beca5eb | 1007 | cell_error(pool, m->cell); |
905386f8 | 1008 | goto out; |
991d9fa0 JT |
1009 | } |
1010 | ||
1011 | /* | |
1012 | * Release any bios held while the block was being provisioned. | |
1013 | * If we are processing a write bio that completely covers the block, | |
1014 | * we already processed it so can ignore it now when processing | |
1015 | * the bios in the cell. | |
1016 | */ | |
1017 | if (bio) { | |
2d759a46 | 1018 | inc_remap_and_issue_cell(tc, m->cell, m->data_block); |
e36827df | 1019 | complete_overwrite_bio(tc, bio); |
2d759a46 JT |
1020 | } else { |
1021 | inc_all_io_entry(tc->pool, m->cell->holder); | |
1022 | remap_and_issue(tc, m->cell->holder, m->data_block); | |
1023 | inc_remap_and_issue_cell(tc, m->cell, m->data_block); | |
1024 | } | |
991d9fa0 | 1025 | |
905386f8 | 1026 | out: |
991d9fa0 | 1027 | list_del(&m->list); |
6beca5eb | 1028 | mempool_free(m, pool->mapping_pool); |
991d9fa0 JT |
1029 | } |
1030 | ||
34fbcf62 JT |
1031 | /*----------------------------------------------------------------*/ |
1032 | ||
1033 | static void free_discard_mapping(struct dm_thin_new_mapping *m) | |
104655fd | 1034 | { |
104655fd | 1035 | struct thin_c *tc = m->tc; |
34fbcf62 JT |
1036 | if (m->cell) |
1037 | cell_defer_no_holder(tc, m->cell); | |
1038 | mempool_free(m, tc->pool->mapping_pool); | |
1039 | } | |
104655fd | 1040 | |
34fbcf62 JT |
1041 | static void process_prepared_discard_fail(struct dm_thin_new_mapping *m) |
1042 | { | |
e49e5829 | 1043 | bio_io_error(m->bio); |
34fbcf62 JT |
1044 | free_discard_mapping(m); |
1045 | } | |
1046 | ||
1047 | static void process_prepared_discard_success(struct dm_thin_new_mapping *m) | |
1048 | { | |
4246a0b6 | 1049 | bio_endio(m->bio); |
34fbcf62 JT |
1050 | free_discard_mapping(m); |
1051 | } | |
1052 | ||
1053 | static void process_prepared_discard_no_passdown(struct dm_thin_new_mapping *m) | |
1054 | { | |
1055 | int r; | |
1056 | struct thin_c *tc = m->tc; | |
1057 | ||
1058 | r = dm_thin_remove_range(tc->td, m->cell->key.block_begin, m->cell->key.block_end); | |
1059 | if (r) { | |
1060 | metadata_operation_failed(tc->pool, "dm_thin_remove_range", r); | |
1061 | bio_io_error(m->bio); | |
1062 | } else | |
4246a0b6 | 1063 | bio_endio(m->bio); |
34fbcf62 | 1064 | |
f286ba0e | 1065 | cell_defer_no_holder(tc, m->cell); |
e49e5829 JT |
1066 | mempool_free(m, tc->pool->mapping_pool); |
1067 | } | |
1068 | ||
202bae52 JT |
1069 | /*----------------------------------------------------------------*/ |
1070 | ||
2a0fbffb JT |
1071 | static void passdown_double_checking_shared_status(struct dm_thin_new_mapping *m, |
1072 | struct bio *discard_parent) | |
e49e5829 | 1073 | { |
34fbcf62 JT |
1074 | /* |
1075 | * We've already unmapped this range of blocks, but before we | |
1076 | * passdown we have to check that these blocks are now unused. | |
1077 | */ | |
202bae52 | 1078 | int r = 0; |
669b786b | 1079 | bool shared = true; |
e49e5829 | 1080 | struct thin_c *tc = m->tc; |
34fbcf62 JT |
1081 | struct pool *pool = tc->pool; |
1082 | dm_block_t b = m->data_block, e, end = m->data_block + m->virt_end - m->virt_begin; | |
202bae52 | 1083 | struct discard_op op; |
104655fd | 1084 | |
2a0fbffb | 1085 | begin_discard(&op, tc, discard_parent); |
34fbcf62 JT |
1086 | while (b != end) { |
1087 | /* find start of unmapped run */ | |
1088 | for (; b < end; b++) { | |
669b786b | 1089 | r = dm_pool_block_is_shared(pool->pmd, b, &shared); |
34fbcf62 | 1090 | if (r) |
202bae52 | 1091 | goto out; |
e8088073 | 1092 | |
669b786b | 1093 | if (!shared) |
34fbcf62 | 1094 | break; |
19fa1a67 | 1095 | } |
104655fd | 1096 | |
34fbcf62 JT |
1097 | if (b == end) |
1098 | break; | |
1099 | ||
1100 | /* find end of run */ | |
1101 | for (e = b + 1; e != end; e++) { | |
669b786b | 1102 | r = dm_pool_block_is_shared(pool->pmd, e, &shared); |
34fbcf62 | 1103 | if (r) |
202bae52 | 1104 | goto out; |
34fbcf62 | 1105 | |
669b786b | 1106 | if (shared) |
34fbcf62 JT |
1107 | break; |
1108 | } | |
1109 | ||
202bae52 | 1110 | r = issue_discard(&op, b, e); |
34fbcf62 | 1111 | if (r) |
202bae52 | 1112 | goto out; |
34fbcf62 JT |
1113 | |
1114 | b = e; | |
1115 | } | |
202bae52 JT |
1116 | out: |
1117 | end_discard(&op, r); | |
104655fd JT |
1118 | } |
1119 | ||
2a0fbffb JT |
1120 | static void queue_passdown_pt2(struct dm_thin_new_mapping *m) |
1121 | { | |
1122 | unsigned long flags; | |
1123 | struct pool *pool = m->tc->pool; | |
1124 | ||
1125 | spin_lock_irqsave(&pool->lock, flags); | |
1126 | list_add_tail(&m->list, &pool->prepared_discards_pt2); | |
1127 | spin_unlock_irqrestore(&pool->lock, flags); | |
1128 | wake_worker(pool); | |
1129 | } | |
1130 | ||
1131 | static void passdown_endio(struct bio *bio) | |
1132 | { | |
1133 | /* | |
1134 | * It doesn't matter if the passdown discard failed, we still want | |
1135 | * to unmap (we ignore err). | |
1136 | */ | |
1137 | queue_passdown_pt2(bio->bi_private); | |
948f581a | 1138 | bio_put(bio); |
2a0fbffb JT |
1139 | } |
1140 | ||
1141 | static void process_prepared_discard_passdown_pt1(struct dm_thin_new_mapping *m) | |
e49e5829 JT |
1142 | { |
1143 | int r; | |
1144 | struct thin_c *tc = m->tc; | |
34fbcf62 | 1145 | struct pool *pool = tc->pool; |
2a0fbffb JT |
1146 | struct bio *discard_parent; |
1147 | dm_block_t data_end = m->data_block + (m->virt_end - m->virt_begin); | |
e49e5829 | 1148 | |
2a0fbffb JT |
1149 | /* |
1150 | * Only this thread allocates blocks, so we can be sure that the | |
1151 | * newly unmapped blocks will not be allocated before the end of | |
1152 | * the function. | |
1153 | */ | |
34fbcf62 | 1154 | r = dm_thin_remove_range(tc->td, m->virt_begin, m->virt_end); |
202bae52 | 1155 | if (r) { |
34fbcf62 | 1156 | metadata_operation_failed(pool, "dm_thin_remove_range", r); |
202bae52 | 1157 | bio_io_error(m->bio); |
2a0fbffb JT |
1158 | cell_defer_no_holder(tc, m->cell); |
1159 | mempool_free(m, pool->mapping_pool); | |
1160 | return; | |
1161 | } | |
34fbcf62 | 1162 | |
00a0ea33 VV |
1163 | /* |
1164 | * Increment the unmapped blocks. This prevents a race between the | |
1165 | * passdown io and reallocation of freed blocks. | |
1166 | */ | |
1167 | r = dm_pool_inc_data_range(pool->pmd, m->data_block, data_end); | |
1168 | if (r) { | |
1169 | metadata_operation_failed(pool, "dm_pool_inc_data_range", r); | |
1170 | bio_io_error(m->bio); | |
1171 | cell_defer_no_holder(tc, m->cell); | |
1172 | mempool_free(m, pool->mapping_pool); | |
1173 | return; | |
1174 | } | |
1175 | ||
2a0fbffb JT |
1176 | discard_parent = bio_alloc(GFP_NOIO, 1); |
1177 | if (!discard_parent) { | |
1178 | DMWARN("%s: unable to allocate top level discard bio for passdown. Skipping passdown.", | |
1179 | dm_device_name(tc->pool->pool_md)); | |
1180 | queue_passdown_pt2(m); | |
202bae52 JT |
1181 | |
1182 | } else { | |
2a0fbffb JT |
1183 | discard_parent->bi_end_io = passdown_endio; |
1184 | discard_parent->bi_private = m; | |
1185 | ||
1186 | if (m->maybe_shared) | |
1187 | passdown_double_checking_shared_status(m, discard_parent); | |
1188 | else { | |
1189 | struct discard_op op; | |
1190 | ||
1191 | begin_discard(&op, tc, discard_parent); | |
1192 | r = issue_discard(&op, m->data_block, data_end); | |
1193 | end_discard(&op, r); | |
1194 | } | |
202bae52 | 1195 | } |
2a0fbffb JT |
1196 | } |
1197 | ||
1198 | static void process_prepared_discard_passdown_pt2(struct dm_thin_new_mapping *m) | |
1199 | { | |
1200 | int r; | |
1201 | struct thin_c *tc = m->tc; | |
1202 | struct pool *pool = tc->pool; | |
1203 | ||
1204 | /* | |
1205 | * The passdown has completed, so now we can decrement all those | |
1206 | * unmapped blocks. | |
1207 | */ | |
1208 | r = dm_pool_dec_data_range(pool->pmd, m->data_block, | |
1209 | m->data_block + (m->virt_end - m->virt_begin)); | |
1210 | if (r) { | |
1211 | metadata_operation_failed(pool, "dm_pool_dec_data_range", r); | |
1212 | bio_io_error(m->bio); | |
1213 | } else | |
1214 | bio_endio(m->bio); | |
1215 | ||
34fbcf62 JT |
1216 | cell_defer_no_holder(tc, m->cell); |
1217 | mempool_free(m, pool->mapping_pool); | |
e49e5829 JT |
1218 | } |
1219 | ||
104655fd | 1220 | static void process_prepared(struct pool *pool, struct list_head *head, |
e49e5829 | 1221 | process_mapping_fn *fn) |
991d9fa0 JT |
1222 | { |
1223 | unsigned long flags; | |
1224 | struct list_head maps; | |
a24c2569 | 1225 | struct dm_thin_new_mapping *m, *tmp; |
991d9fa0 JT |
1226 | |
1227 | INIT_LIST_HEAD(&maps); | |
1228 | spin_lock_irqsave(&pool->lock, flags); | |
104655fd | 1229 | list_splice_init(head, &maps); |
991d9fa0 JT |
1230 | spin_unlock_irqrestore(&pool->lock, flags); |
1231 | ||
1232 | list_for_each_entry_safe(m, tmp, &maps, list) | |
e49e5829 | 1233 | (*fn)(m); |
991d9fa0 JT |
1234 | } |
1235 | ||
1236 | /* | |
1237 | * Deferred bio jobs. | |
1238 | */ | |
104655fd | 1239 | static int io_overlaps_block(struct pool *pool, struct bio *bio) |
991d9fa0 | 1240 | { |
4f024f37 KO |
1241 | return bio->bi_iter.bi_size == |
1242 | (pool->sectors_per_block << SECTOR_SHIFT); | |
104655fd JT |
1243 | } |
1244 | ||
1245 | static int io_overwrites_block(struct pool *pool, struct bio *bio) | |
1246 | { | |
1247 | return (bio_data_dir(bio) == WRITE) && | |
1248 | io_overlaps_block(pool, bio); | |
991d9fa0 JT |
1249 | } |
1250 | ||
1251 | static void save_and_set_endio(struct bio *bio, bio_end_io_t **save, | |
1252 | bio_end_io_t *fn) | |
1253 | { | |
1254 | *save = bio->bi_end_io; | |
1255 | bio->bi_end_io = fn; | |
1256 | } | |
1257 | ||
1258 | static int ensure_next_mapping(struct pool *pool) | |
1259 | { | |
1260 | if (pool->next_mapping) | |
1261 | return 0; | |
1262 | ||
1263 | pool->next_mapping = mempool_alloc(pool->mapping_pool, GFP_ATOMIC); | |
1264 | ||
1265 | return pool->next_mapping ? 0 : -ENOMEM; | |
1266 | } | |
1267 | ||
a24c2569 | 1268 | static struct dm_thin_new_mapping *get_next_mapping(struct pool *pool) |
991d9fa0 | 1269 | { |
16961b04 | 1270 | struct dm_thin_new_mapping *m = pool->next_mapping; |
991d9fa0 JT |
1271 | |
1272 | BUG_ON(!pool->next_mapping); | |
1273 | ||
16961b04 MS |
1274 | memset(m, 0, sizeof(struct dm_thin_new_mapping)); |
1275 | INIT_LIST_HEAD(&m->list); | |
1276 | m->bio = NULL; | |
1277 | ||
991d9fa0 JT |
1278 | pool->next_mapping = NULL; |
1279 | ||
16961b04 | 1280 | return m; |
991d9fa0 JT |
1281 | } |
1282 | ||
e5aea7b4 JT |
1283 | static void ll_zero(struct thin_c *tc, struct dm_thin_new_mapping *m, |
1284 | sector_t begin, sector_t end) | |
1285 | { | |
1286 | int r; | |
1287 | struct dm_io_region to; | |
1288 | ||
1289 | to.bdev = tc->pool_dev->bdev; | |
1290 | to.sector = begin; | |
1291 | to.count = end - begin; | |
1292 | ||
1293 | r = dm_kcopyd_zero(tc->pool->copier, 1, &to, 0, copy_complete, m); | |
1294 | if (r < 0) { | |
1295 | DMERR_LIMIT("dm_kcopyd_zero() failed"); | |
1296 | copy_complete(1, 1, m); | |
1297 | } | |
1298 | } | |
1299 | ||
452d7a62 | 1300 | static void remap_and_issue_overwrite(struct thin_c *tc, struct bio *bio, |
34fbcf62 | 1301 | dm_block_t data_begin, |
452d7a62 MS |
1302 | struct dm_thin_new_mapping *m) |
1303 | { | |
1304 | struct pool *pool = tc->pool; | |
1305 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); | |
1306 | ||
1307 | h->overwrite_mapping = m; | |
1308 | m->bio = bio; | |
1309 | save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio); | |
1310 | inc_all_io_entry(pool, bio); | |
34fbcf62 | 1311 | remap_and_issue(tc, bio, data_begin); |
452d7a62 MS |
1312 | } |
1313 | ||
e5aea7b4 JT |
1314 | /* |
1315 | * A partial copy also needs to zero the uncopied region. | |
1316 | */ | |
991d9fa0 | 1317 | static void schedule_copy(struct thin_c *tc, dm_block_t virt_block, |
2dd9c257 JT |
1318 | struct dm_dev *origin, dm_block_t data_origin, |
1319 | dm_block_t data_dest, | |
e5aea7b4 JT |
1320 | struct dm_bio_prison_cell *cell, struct bio *bio, |
1321 | sector_t len) | |
991d9fa0 JT |
1322 | { |
1323 | int r; | |
1324 | struct pool *pool = tc->pool; | |
a24c2569 | 1325 | struct dm_thin_new_mapping *m = get_next_mapping(pool); |
991d9fa0 | 1326 | |
991d9fa0 | 1327 | m->tc = tc; |
34fbcf62 JT |
1328 | m->virt_begin = virt_block; |
1329 | m->virt_end = virt_block + 1u; | |
991d9fa0 JT |
1330 | m->data_block = data_dest; |
1331 | m->cell = cell; | |
991d9fa0 | 1332 | |
e5aea7b4 JT |
1333 | /* |
1334 | * quiesce action + copy action + an extra reference held for the | |
1335 | * duration of this function (we may need to inc later for a | |
1336 | * partial zero). | |
1337 | */ | |
1338 | atomic_set(&m->prepare_actions, 3); | |
1339 | ||
44feb387 | 1340 | if (!dm_deferred_set_add_work(pool->shared_read_ds, &m->list)) |
e5aea7b4 | 1341 | complete_mapping_preparation(m); /* already quiesced */ |
991d9fa0 JT |
1342 | |
1343 | /* | |
1344 | * IO to pool_dev remaps to the pool target's data_dev. | |
1345 | * | |
1346 | * If the whole block of data is being overwritten, we can issue the | |
1347 | * bio immediately. Otherwise we use kcopyd to clone the data first. | |
1348 | */ | |
452d7a62 MS |
1349 | if (io_overwrites_block(pool, bio)) |
1350 | remap_and_issue_overwrite(tc, bio, data_dest, m); | |
1351 | else { | |
991d9fa0 JT |
1352 | struct dm_io_region from, to; |
1353 | ||
2dd9c257 | 1354 | from.bdev = origin->bdev; |
991d9fa0 | 1355 | from.sector = data_origin * pool->sectors_per_block; |
e5aea7b4 | 1356 | from.count = len; |
991d9fa0 JT |
1357 | |
1358 | to.bdev = tc->pool_dev->bdev; | |
1359 | to.sector = data_dest * pool->sectors_per_block; | |
e5aea7b4 | 1360 | to.count = len; |
991d9fa0 JT |
1361 | |
1362 | r = dm_kcopyd_copy(pool->copier, &from, 1, &to, | |
1363 | 0, copy_complete, m); | |
1364 | if (r < 0) { | |
c397741c | 1365 | DMERR_LIMIT("dm_kcopyd_copy() failed"); |
e5aea7b4 JT |
1366 | copy_complete(1, 1, m); |
1367 | ||
1368 | /* | |
1369 | * We allow the zero to be issued, to simplify the | |
1370 | * error path. Otherwise we'd need to start | |
1371 | * worrying about decrementing the prepare_actions | |
1372 | * counter. | |
1373 | */ | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * Do we need to zero a tail region? | |
1378 | */ | |
1379 | if (len < pool->sectors_per_block && pool->pf.zero_new_blocks) { | |
1380 | atomic_inc(&m->prepare_actions); | |
1381 | ll_zero(tc, m, | |
1382 | data_dest * pool->sectors_per_block + len, | |
1383 | (data_dest + 1) * pool->sectors_per_block); | |
991d9fa0 JT |
1384 | } |
1385 | } | |
e5aea7b4 JT |
1386 | |
1387 | complete_mapping_preparation(m); /* drop our ref */ | |
991d9fa0 JT |
1388 | } |
1389 | ||
2dd9c257 JT |
1390 | static void schedule_internal_copy(struct thin_c *tc, dm_block_t virt_block, |
1391 | dm_block_t data_origin, dm_block_t data_dest, | |
a24c2569 | 1392 | struct dm_bio_prison_cell *cell, struct bio *bio) |
2dd9c257 JT |
1393 | { |
1394 | schedule_copy(tc, virt_block, tc->pool_dev, | |
e5aea7b4 JT |
1395 | data_origin, data_dest, cell, bio, |
1396 | tc->pool->sectors_per_block); | |
2dd9c257 JT |
1397 | } |
1398 | ||
991d9fa0 | 1399 | static void schedule_zero(struct thin_c *tc, dm_block_t virt_block, |
a24c2569 | 1400 | dm_block_t data_block, struct dm_bio_prison_cell *cell, |
991d9fa0 JT |
1401 | struct bio *bio) |
1402 | { | |
1403 | struct pool *pool = tc->pool; | |
a24c2569 | 1404 | struct dm_thin_new_mapping *m = get_next_mapping(pool); |
991d9fa0 | 1405 | |
50f3c3ef | 1406 | atomic_set(&m->prepare_actions, 1); /* no need to quiesce */ |
991d9fa0 | 1407 | m->tc = tc; |
34fbcf62 JT |
1408 | m->virt_begin = virt_block; |
1409 | m->virt_end = virt_block + 1u; | |
991d9fa0 JT |
1410 | m->data_block = data_block; |
1411 | m->cell = cell; | |
991d9fa0 JT |
1412 | |
1413 | /* | |
1414 | * If the whole block of data is being overwritten or we are not | |
1415 | * zeroing pre-existing data, we can issue the bio immediately. | |
1416 | * Otherwise we use kcopyd to zero the data first. | |
1417 | */ | |
f8ae7525 MS |
1418 | if (pool->pf.zero_new_blocks) { |
1419 | if (io_overwrites_block(pool, bio)) | |
1420 | remap_and_issue_overwrite(tc, bio, data_block, m); | |
1421 | else | |
1422 | ll_zero(tc, m, data_block * pool->sectors_per_block, | |
1423 | (data_block + 1) * pool->sectors_per_block); | |
1424 | } else | |
991d9fa0 | 1425 | process_prepared_mapping(m); |
e5aea7b4 | 1426 | } |
991d9fa0 | 1427 | |
e5aea7b4 JT |
1428 | static void schedule_external_copy(struct thin_c *tc, dm_block_t virt_block, |
1429 | dm_block_t data_dest, | |
1430 | struct dm_bio_prison_cell *cell, struct bio *bio) | |
1431 | { | |
1432 | struct pool *pool = tc->pool; | |
1433 | sector_t virt_block_begin = virt_block * pool->sectors_per_block; | |
1434 | sector_t virt_block_end = (virt_block + 1) * pool->sectors_per_block; | |
1435 | ||
1436 | if (virt_block_end <= tc->origin_size) | |
1437 | schedule_copy(tc, virt_block, tc->origin_dev, | |
1438 | virt_block, data_dest, cell, bio, | |
1439 | pool->sectors_per_block); | |
1440 | ||
1441 | else if (virt_block_begin < tc->origin_size) | |
1442 | schedule_copy(tc, virt_block, tc->origin_dev, | |
1443 | virt_block, data_dest, cell, bio, | |
1444 | tc->origin_size - virt_block_begin); | |
1445 | ||
1446 | else | |
1447 | schedule_zero(tc, virt_block, data_dest, cell, bio); | |
991d9fa0 JT |
1448 | } |
1449 | ||
2c43fd26 JT |
1450 | static void set_pool_mode(struct pool *pool, enum pool_mode new_mode); |
1451 | ||
bc3c73d0 MS |
1452 | static void requeue_bios(struct pool *pool); |
1453 | ||
7e420796 JT |
1454 | static bool is_read_only_pool_mode(enum pool_mode mode) |
1455 | { | |
1456 | return (mode == PM_OUT_OF_METADATA_SPACE || mode == PM_READ_ONLY); | |
1457 | } | |
1458 | ||
1459 | static bool is_read_only(struct pool *pool) | |
1460 | { | |
1461 | return is_read_only_pool_mode(get_pool_mode(pool)); | |
1462 | } | |
1463 | ||
1464 | static void check_for_metadata_space(struct pool *pool) | |
1465 | { | |
1466 | int r; | |
1467 | const char *ooms_reason = NULL; | |
1468 | dm_block_t nr_free; | |
1469 | ||
1470 | r = dm_pool_get_free_metadata_block_count(pool->pmd, &nr_free); | |
1471 | if (r) | |
1472 | ooms_reason = "Could not get free metadata blocks"; | |
1473 | else if (!nr_free) | |
1474 | ooms_reason = "No free metadata blocks"; | |
1475 | ||
1476 | if (ooms_reason && !is_read_only(pool)) { | |
1477 | DMERR("%s", ooms_reason); | |
1478 | set_pool_mode(pool, PM_OUT_OF_METADATA_SPACE); | |
1479 | } | |
1480 | } | |
1481 | ||
1482 | static void check_for_data_space(struct pool *pool) | |
2c43fd26 JT |
1483 | { |
1484 | int r; | |
1485 | dm_block_t nr_free; | |
1486 | ||
1487 | if (get_pool_mode(pool) != PM_OUT_OF_DATA_SPACE) | |
1488 | return; | |
1489 | ||
1490 | r = dm_pool_get_free_block_count(pool->pmd, &nr_free); | |
1491 | if (r) | |
1492 | return; | |
1493 | ||
bc3c73d0 | 1494 | if (nr_free) { |
2c43fd26 | 1495 | set_pool_mode(pool, PM_WRITE); |
bc3c73d0 MS |
1496 | requeue_bios(pool); |
1497 | } | |
2c43fd26 JT |
1498 | } |
1499 | ||
e49e5829 JT |
1500 | /* |
1501 | * A non-zero return indicates read_only or fail_io mode. | |
1502 | * Many callers don't care about the return value. | |
1503 | */ | |
020cc3b5 | 1504 | static int commit(struct pool *pool) |
e49e5829 JT |
1505 | { |
1506 | int r; | |
1507 | ||
7e420796 | 1508 | if (get_pool_mode(pool) >= PM_OUT_OF_METADATA_SPACE) |
e49e5829 JT |
1509 | return -EINVAL; |
1510 | ||
020cc3b5 | 1511 | r = dm_pool_commit_metadata(pool->pmd); |
b5330655 JT |
1512 | if (r) |
1513 | metadata_operation_failed(pool, "dm_pool_commit_metadata", r); | |
7e420796 JT |
1514 | else { |
1515 | check_for_metadata_space(pool); | |
1516 | check_for_data_space(pool); | |
1517 | } | |
e49e5829 JT |
1518 | |
1519 | return r; | |
1520 | } | |
1521 | ||
88a6621b JT |
1522 | static void check_low_water_mark(struct pool *pool, dm_block_t free_blocks) |
1523 | { | |
1524 | unsigned long flags; | |
1525 | ||
1526 | if (free_blocks <= pool->low_water_blocks && !pool->low_water_triggered) { | |
1527 | DMWARN("%s: reached low water mark for data device: sending event.", | |
1528 | dm_device_name(pool->pool_md)); | |
1529 | spin_lock_irqsave(&pool->lock, flags); | |
1530 | pool->low_water_triggered = true; | |
1531 | spin_unlock_irqrestore(&pool->lock, flags); | |
1532 | dm_table_event(pool->ti->table); | |
1533 | } | |
1534 | } | |
1535 | ||
991d9fa0 JT |
1536 | static int alloc_data_block(struct thin_c *tc, dm_block_t *result) |
1537 | { | |
1538 | int r; | |
1539 | dm_block_t free_blocks; | |
991d9fa0 JT |
1540 | struct pool *pool = tc->pool; |
1541 | ||
3e1a0699 | 1542 | if (WARN_ON(get_pool_mode(pool) != PM_WRITE)) |
8d30abff JT |
1543 | return -EINVAL; |
1544 | ||
991d9fa0 | 1545 | r = dm_pool_get_free_block_count(pool->pmd, &free_blocks); |
b5330655 JT |
1546 | if (r) { |
1547 | metadata_operation_failed(pool, "dm_pool_get_free_block_count", r); | |
991d9fa0 | 1548 | return r; |
b5330655 | 1549 | } |
991d9fa0 | 1550 | |
88a6621b | 1551 | check_low_water_mark(pool, free_blocks); |
991d9fa0 JT |
1552 | |
1553 | if (!free_blocks) { | |
94563bad MS |
1554 | /* |
1555 | * Try to commit to see if that will free up some | |
1556 | * more space. | |
1557 | */ | |
020cc3b5 JT |
1558 | r = commit(pool); |
1559 | if (r) | |
1560 | return r; | |
991d9fa0 | 1561 | |
94563bad | 1562 | r = dm_pool_get_free_block_count(pool->pmd, &free_blocks); |
b5330655 JT |
1563 | if (r) { |
1564 | metadata_operation_failed(pool, "dm_pool_get_free_block_count", r); | |
94563bad | 1565 | return r; |
b5330655 | 1566 | } |
991d9fa0 | 1567 | |
94563bad | 1568 | if (!free_blocks) { |
3e1a0699 | 1569 | set_pool_mode(pool, PM_OUT_OF_DATA_SPACE); |
94563bad | 1570 | return -ENOSPC; |
991d9fa0 JT |
1571 | } |
1572 | } | |
1573 | ||
1574 | r = dm_pool_alloc_data_block(pool->pmd, result); | |
4a02b34e | 1575 | if (r) { |
bc3c73d0 MS |
1576 | if (r == -ENOSPC) |
1577 | set_pool_mode(pool, PM_OUT_OF_DATA_SPACE); | |
1578 | else | |
1579 | metadata_operation_failed(pool, "dm_pool_alloc_data_block", r); | |
991d9fa0 | 1580 | return r; |
4a02b34e | 1581 | } |
991d9fa0 | 1582 | |
7e420796 JT |
1583 | r = dm_pool_get_free_metadata_block_count(pool->pmd, &free_blocks); |
1584 | if (r) { | |
1585 | metadata_operation_failed(pool, "dm_pool_get_free_metadata_block_count", r); | |
1586 | return r; | |
1587 | } | |
1588 | ||
1589 | if (!free_blocks) { | |
1590 | /* Let's commit before we use up the metadata reserve. */ | |
1591 | r = commit(pool); | |
1592 | if (r) | |
1593 | return r; | |
1594 | } | |
1595 | ||
991d9fa0 JT |
1596 | return 0; |
1597 | } | |
1598 | ||
1599 | /* | |
1600 | * If we have run out of space, queue bios until the device is | |
1601 | * resumed, presumably after having been reloaded with more space. | |
1602 | */ | |
1603 | static void retry_on_resume(struct bio *bio) | |
1604 | { | |
59c3d2c6 | 1605 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
eb2aa48d | 1606 | struct thin_c *tc = h->tc; |
991d9fa0 JT |
1607 | unsigned long flags; |
1608 | ||
c140e1c4 MS |
1609 | spin_lock_irqsave(&tc->lock, flags); |
1610 | bio_list_add(&tc->retry_on_resume_list, bio); | |
1611 | spin_unlock_irqrestore(&tc->lock, flags); | |
991d9fa0 JT |
1612 | } |
1613 | ||
4e4cbee9 | 1614 | static blk_status_t should_error_unserviceable_bio(struct pool *pool) |
8c0f0e8c | 1615 | { |
3e1a0699 JT |
1616 | enum pool_mode m = get_pool_mode(pool); |
1617 | ||
1618 | switch (m) { | |
1619 | case PM_WRITE: | |
1620 | /* Shouldn't get here */ | |
1621 | DMERR_LIMIT("bio unserviceable, yet pool is in PM_WRITE mode"); | |
4e4cbee9 | 1622 | return BLK_STS_IOERR; |
3e1a0699 JT |
1623 | |
1624 | case PM_OUT_OF_DATA_SPACE: | |
4e4cbee9 | 1625 | return pool->pf.error_if_no_space ? BLK_STS_NOSPC : 0; |
3e1a0699 | 1626 | |
7e420796 | 1627 | case PM_OUT_OF_METADATA_SPACE: |
3e1a0699 JT |
1628 | case PM_READ_ONLY: |
1629 | case PM_FAIL: | |
4e4cbee9 | 1630 | return BLK_STS_IOERR; |
3e1a0699 JT |
1631 | default: |
1632 | /* Shouldn't get here */ | |
1633 | DMERR_LIMIT("bio unserviceable, yet pool has an unknown mode"); | |
4e4cbee9 | 1634 | return BLK_STS_IOERR; |
3e1a0699 JT |
1635 | } |
1636 | } | |
8c0f0e8c | 1637 | |
3e1a0699 JT |
1638 | static void handle_unserviceable_bio(struct pool *pool, struct bio *bio) |
1639 | { | |
4e4cbee9 | 1640 | blk_status_t error = should_error_unserviceable_bio(pool); |
af91805a | 1641 | |
4246a0b6 | 1642 | if (error) { |
4e4cbee9 | 1643 | bio->bi_status = error; |
4246a0b6 CH |
1644 | bio_endio(bio); |
1645 | } else | |
6d16202b | 1646 | retry_on_resume(bio); |
8c0f0e8c MS |
1647 | } |
1648 | ||
399caddf | 1649 | static void retry_bios_on_resume(struct pool *pool, struct dm_bio_prison_cell *cell) |
991d9fa0 JT |
1650 | { |
1651 | struct bio *bio; | |
1652 | struct bio_list bios; | |
4e4cbee9 | 1653 | blk_status_t error; |
991d9fa0 | 1654 | |
af91805a MS |
1655 | error = should_error_unserviceable_bio(pool); |
1656 | if (error) { | |
1657 | cell_error_with_code(pool, cell, error); | |
3e1a0699 JT |
1658 | return; |
1659 | } | |
1660 | ||
991d9fa0 | 1661 | bio_list_init(&bios); |
6beca5eb | 1662 | cell_release(pool, cell, &bios); |
991d9fa0 | 1663 | |
9d094eeb MS |
1664 | while ((bio = bio_list_pop(&bios))) |
1665 | retry_on_resume(bio); | |
991d9fa0 JT |
1666 | } |
1667 | ||
34fbcf62 JT |
1668 | static void process_discard_cell_no_passdown(struct thin_c *tc, |
1669 | struct dm_bio_prison_cell *virt_cell) | |
104655fd | 1670 | { |
104655fd | 1671 | struct pool *pool = tc->pool; |
34fbcf62 | 1672 | struct dm_thin_new_mapping *m = get_next_mapping(pool); |
104655fd | 1673 | |
34fbcf62 JT |
1674 | /* |
1675 | * We don't need to lock the data blocks, since there's no | |
1676 | * passdown. We only lock data blocks for allocation and breaking sharing. | |
1677 | */ | |
1678 | m->tc = tc; | |
1679 | m->virt_begin = virt_cell->key.block_begin; | |
1680 | m->virt_end = virt_cell->key.block_end; | |
1681 | m->cell = virt_cell; | |
1682 | m->bio = virt_cell->holder; | |
104655fd | 1683 | |
34fbcf62 JT |
1684 | if (!dm_deferred_set_add_work(pool->all_io_ds, &m->list)) |
1685 | pool->process_prepared_discard(m); | |
1686 | } | |
104655fd | 1687 | |
34fbcf62 JT |
1688 | static void break_up_discard_bio(struct thin_c *tc, dm_block_t begin, dm_block_t end, |
1689 | struct bio *bio) | |
1690 | { | |
1691 | struct pool *pool = tc->pool; | |
1692 | ||
1693 | int r; | |
1694 | bool maybe_shared; | |
1695 | struct dm_cell_key data_key; | |
1696 | struct dm_bio_prison_cell *data_cell; | |
1697 | struct dm_thin_new_mapping *m; | |
1698 | dm_block_t virt_begin, virt_end, data_begin; | |
1699 | ||
1700 | while (begin != end) { | |
1701 | r = ensure_next_mapping(pool); | |
1702 | if (r) | |
1703 | /* we did our best */ | |
1704 | return; | |
e8088073 | 1705 | |
34fbcf62 JT |
1706 | r = dm_thin_find_mapped_range(tc->td, begin, end, &virt_begin, &virt_end, |
1707 | &data_begin, &maybe_shared); | |
1708 | if (r) | |
104655fd | 1709 | /* |
34fbcf62 JT |
1710 | * Silently fail, letting any mappings we've |
1711 | * created complete. | |
104655fd | 1712 | */ |
34fbcf62 JT |
1713 | break; |
1714 | ||
1715 | build_key(tc->td, PHYSICAL, data_begin, data_begin + (virt_end - virt_begin), &data_key); | |
1716 | if (bio_detain(tc->pool, &data_key, NULL, &data_cell)) { | |
1717 | /* contention, we'll give up with this range */ | |
1718 | begin = virt_end; | |
1719 | continue; | |
104655fd | 1720 | } |
104655fd | 1721 | |
104655fd | 1722 | /* |
34fbcf62 JT |
1723 | * IO may still be going to the destination block. We must |
1724 | * quiesce before we can do the removal. | |
104655fd | 1725 | */ |
34fbcf62 JT |
1726 | m = get_next_mapping(pool); |
1727 | m->tc = tc; | |
1728 | m->maybe_shared = maybe_shared; | |
1729 | m->virt_begin = virt_begin; | |
1730 | m->virt_end = virt_end; | |
1731 | m->data_block = data_begin; | |
1732 | m->cell = data_cell; | |
1733 | m->bio = bio; | |
104655fd | 1734 | |
34fbcf62 JT |
1735 | /* |
1736 | * The parent bio must not complete before sub discard bios are | |
202bae52 | 1737 | * chained to it (see end_discard's bio_chain)! |
34fbcf62 JT |
1738 | * |
1739 | * This per-mapping bi_remaining increment is paired with | |
1740 | * the implicit decrement that occurs via bio_endio() in | |
202bae52 | 1741 | * end_discard(). |
34fbcf62 | 1742 | */ |
13e4f8a6 | 1743 | bio_inc_remaining(bio); |
34fbcf62 JT |
1744 | if (!dm_deferred_set_add_work(pool->all_io_ds, &m->list)) |
1745 | pool->process_prepared_discard(m); | |
1746 | ||
1747 | begin = virt_end; | |
104655fd JT |
1748 | } |
1749 | } | |
1750 | ||
34fbcf62 JT |
1751 | static void process_discard_cell_passdown(struct thin_c *tc, struct dm_bio_prison_cell *virt_cell) |
1752 | { | |
1753 | struct bio *bio = virt_cell->holder; | |
1754 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); | |
1755 | ||
1756 | /* | |
1757 | * The virt_cell will only get freed once the origin bio completes. | |
1758 | * This means it will remain locked while all the individual | |
1759 | * passdown bios are in flight. | |
1760 | */ | |
1761 | h->cell = virt_cell; | |
1762 | break_up_discard_bio(tc, virt_cell->key.block_begin, virt_cell->key.block_end, bio); | |
1763 | ||
1764 | /* | |
1765 | * We complete the bio now, knowing that the bi_remaining field | |
1766 | * will prevent completion until the sub range discards have | |
1767 | * completed. | |
1768 | */ | |
4246a0b6 | 1769 | bio_endio(bio); |
34fbcf62 JT |
1770 | } |
1771 | ||
a374bb21 JT |
1772 | static void process_discard_bio(struct thin_c *tc, struct bio *bio) |
1773 | { | |
34fbcf62 JT |
1774 | dm_block_t begin, end; |
1775 | struct dm_cell_key virt_key; | |
1776 | struct dm_bio_prison_cell *virt_cell; | |
a374bb21 | 1777 | |
34fbcf62 JT |
1778 | get_bio_block_range(tc, bio, &begin, &end); |
1779 | if (begin == end) { | |
1780 | /* | |
1781 | * The discard covers less than a block. | |
1782 | */ | |
4246a0b6 | 1783 | bio_endio(bio); |
a374bb21 | 1784 | return; |
34fbcf62 | 1785 | } |
a374bb21 | 1786 | |
34fbcf62 JT |
1787 | build_key(tc->td, VIRTUAL, begin, end, &virt_key); |
1788 | if (bio_detain(tc->pool, &virt_key, bio, &virt_cell)) | |
1789 | /* | |
1790 | * Potential starvation issue: We're relying on the | |
1791 | * fs/application being well behaved, and not trying to | |
1792 | * send IO to a region at the same time as discarding it. | |
1793 | * If they do this persistently then it's possible this | |
1794 | * cell will never be granted. | |
1795 | */ | |
1796 | return; | |
1797 | ||
1798 | tc->pool->process_discard_cell(tc, virt_cell); | |
a374bb21 JT |
1799 | } |
1800 | ||
991d9fa0 | 1801 | static void break_sharing(struct thin_c *tc, struct bio *bio, dm_block_t block, |
44feb387 | 1802 | struct dm_cell_key *key, |
991d9fa0 | 1803 | struct dm_thin_lookup_result *lookup_result, |
a24c2569 | 1804 | struct dm_bio_prison_cell *cell) |
991d9fa0 JT |
1805 | { |
1806 | int r; | |
1807 | dm_block_t data_block; | |
d6fc2042 | 1808 | struct pool *pool = tc->pool; |
991d9fa0 JT |
1809 | |
1810 | r = alloc_data_block(tc, &data_block); | |
1811 | switch (r) { | |
1812 | case 0: | |
2dd9c257 JT |
1813 | schedule_internal_copy(tc, block, lookup_result->block, |
1814 | data_block, cell, bio); | |
991d9fa0 JT |
1815 | break; |
1816 | ||
1817 | case -ENOSPC: | |
399caddf | 1818 | retry_bios_on_resume(pool, cell); |
991d9fa0 JT |
1819 | break; |
1820 | ||
1821 | default: | |
c397741c MS |
1822 | DMERR_LIMIT("%s: alloc_data_block() failed: error = %d", |
1823 | __func__, r); | |
d6fc2042 | 1824 | cell_error(pool, cell); |
991d9fa0 JT |
1825 | break; |
1826 | } | |
1827 | } | |
1828 | ||
23ca2bb6 JT |
1829 | static void __remap_and_issue_shared_cell(void *context, |
1830 | struct dm_bio_prison_cell *cell) | |
1831 | { | |
1832 | struct remap_info *info = context; | |
1833 | struct bio *bio; | |
1834 | ||
1835 | while ((bio = bio_list_pop(&cell->bios))) { | |
f73f44eb CH |
1836 | if (bio_data_dir(bio) == WRITE || op_is_flush(bio->bi_opf) || |
1837 | bio_op(bio) == REQ_OP_DISCARD) | |
23ca2bb6 JT |
1838 | bio_list_add(&info->defer_bios, bio); |
1839 | else { | |
1840 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook));; | |
1841 | ||
1842 | h->shared_read_entry = dm_deferred_entry_inc(info->tc->pool->shared_read_ds); | |
1843 | inc_all_io_entry(info->tc->pool, bio); | |
1844 | bio_list_add(&info->issue_bios, bio); | |
1845 | } | |
1846 | } | |
1847 | } | |
1848 | ||
1849 | static void remap_and_issue_shared_cell(struct thin_c *tc, | |
1850 | struct dm_bio_prison_cell *cell, | |
1851 | dm_block_t block) | |
1852 | { | |
1853 | struct bio *bio; | |
1854 | struct remap_info info; | |
1855 | ||
1856 | info.tc = tc; | |
1857 | bio_list_init(&info.defer_bios); | |
1858 | bio_list_init(&info.issue_bios); | |
1859 | ||
1860 | cell_visit_release(tc->pool, __remap_and_issue_shared_cell, | |
1861 | &info, cell); | |
1862 | ||
1863 | while ((bio = bio_list_pop(&info.defer_bios))) | |
1864 | thin_defer_bio(tc, bio); | |
1865 | ||
1866 | while ((bio = bio_list_pop(&info.issue_bios))) | |
1867 | remap_and_issue(tc, bio, block); | |
1868 | } | |
1869 | ||
991d9fa0 JT |
1870 | static void process_shared_bio(struct thin_c *tc, struct bio *bio, |
1871 | dm_block_t block, | |
23ca2bb6 JT |
1872 | struct dm_thin_lookup_result *lookup_result, |
1873 | struct dm_bio_prison_cell *virt_cell) | |
991d9fa0 | 1874 | { |
23ca2bb6 | 1875 | struct dm_bio_prison_cell *data_cell; |
991d9fa0 | 1876 | struct pool *pool = tc->pool; |
44feb387 | 1877 | struct dm_cell_key key; |
991d9fa0 JT |
1878 | |
1879 | /* | |
1880 | * If cell is already occupied, then sharing is already in the process | |
1881 | * of being broken so we have nothing further to do here. | |
1882 | */ | |
1883 | build_data_key(tc->td, lookup_result->block, &key); | |
23ca2bb6 JT |
1884 | if (bio_detain(pool, &key, bio, &data_cell)) { |
1885 | cell_defer_no_holder(tc, virt_cell); | |
991d9fa0 | 1886 | return; |
23ca2bb6 | 1887 | } |
991d9fa0 | 1888 | |
23ca2bb6 JT |
1889 | if (bio_data_dir(bio) == WRITE && bio->bi_iter.bi_size) { |
1890 | break_sharing(tc, bio, block, &key, lookup_result, data_cell); | |
1891 | cell_defer_no_holder(tc, virt_cell); | |
1892 | } else { | |
59c3d2c6 | 1893 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
991d9fa0 | 1894 | |
44feb387 | 1895 | h->shared_read_entry = dm_deferred_entry_inc(pool->shared_read_ds); |
e8088073 | 1896 | inc_all_io_entry(pool, bio); |
991d9fa0 | 1897 | remap_and_issue(tc, bio, lookup_result->block); |
23ca2bb6 JT |
1898 | |
1899 | remap_and_issue_shared_cell(tc, data_cell, lookup_result->block); | |
1900 | remap_and_issue_shared_cell(tc, virt_cell, lookup_result->block); | |
991d9fa0 JT |
1901 | } |
1902 | } | |
1903 | ||
1904 | static void provision_block(struct thin_c *tc, struct bio *bio, dm_block_t block, | |
a24c2569 | 1905 | struct dm_bio_prison_cell *cell) |
991d9fa0 JT |
1906 | { |
1907 | int r; | |
1908 | dm_block_t data_block; | |
6beca5eb | 1909 | struct pool *pool = tc->pool; |
991d9fa0 JT |
1910 | |
1911 | /* | |
1912 | * Remap empty bios (flushes) immediately, without provisioning. | |
1913 | */ | |
4f024f37 | 1914 | if (!bio->bi_iter.bi_size) { |
6beca5eb | 1915 | inc_all_io_entry(pool, bio); |
f286ba0e | 1916 | cell_defer_no_holder(tc, cell); |
e8088073 | 1917 | |
991d9fa0 JT |
1918 | remap_and_issue(tc, bio, 0); |
1919 | return; | |
1920 | } | |
1921 | ||
1922 | /* | |
1923 | * Fill read bios with zeroes and complete them immediately. | |
1924 | */ | |
1925 | if (bio_data_dir(bio) == READ) { | |
1926 | zero_fill_bio(bio); | |
f286ba0e | 1927 | cell_defer_no_holder(tc, cell); |
4246a0b6 | 1928 | bio_endio(bio); |
991d9fa0 JT |
1929 | return; |
1930 | } | |
1931 | ||
1932 | r = alloc_data_block(tc, &data_block); | |
1933 | switch (r) { | |
1934 | case 0: | |
2dd9c257 JT |
1935 | if (tc->origin_dev) |
1936 | schedule_external_copy(tc, block, data_block, cell, bio); | |
1937 | else | |
1938 | schedule_zero(tc, block, data_block, cell, bio); | |
991d9fa0 JT |
1939 | break; |
1940 | ||
1941 | case -ENOSPC: | |
399caddf | 1942 | retry_bios_on_resume(pool, cell); |
991d9fa0 JT |
1943 | break; |
1944 | ||
1945 | default: | |
c397741c MS |
1946 | DMERR_LIMIT("%s: alloc_data_block() failed: error = %d", |
1947 | __func__, r); | |
6beca5eb | 1948 | cell_error(pool, cell); |
991d9fa0 JT |
1949 | break; |
1950 | } | |
1951 | } | |
1952 | ||
a374bb21 | 1953 | static void process_cell(struct thin_c *tc, struct dm_bio_prison_cell *cell) |
991d9fa0 JT |
1954 | { |
1955 | int r; | |
6beca5eb | 1956 | struct pool *pool = tc->pool; |
a374bb21 | 1957 | struct bio *bio = cell->holder; |
991d9fa0 | 1958 | dm_block_t block = get_bio_block(tc, bio); |
991d9fa0 JT |
1959 | struct dm_thin_lookup_result lookup_result; |
1960 | ||
a374bb21 JT |
1961 | if (tc->requeue_mode) { |
1962 | cell_requeue(pool, cell); | |
991d9fa0 | 1963 | return; |
a374bb21 | 1964 | } |
991d9fa0 JT |
1965 | |
1966 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); | |
1967 | switch (r) { | |
1968 | case 0: | |
23ca2bb6 JT |
1969 | if (lookup_result.shared) |
1970 | process_shared_bio(tc, bio, block, &lookup_result, cell); | |
1971 | else { | |
6beca5eb | 1972 | inc_all_io_entry(pool, bio); |
991d9fa0 | 1973 | remap_and_issue(tc, bio, lookup_result.block); |
a374bb21 | 1974 | inc_remap_and_issue_cell(tc, cell, lookup_result.block); |
e8088073 | 1975 | } |
991d9fa0 JT |
1976 | break; |
1977 | ||
1978 | case -ENODATA: | |
2dd9c257 | 1979 | if (bio_data_dir(bio) == READ && tc->origin_dev) { |
6beca5eb | 1980 | inc_all_io_entry(pool, bio); |
f286ba0e | 1981 | cell_defer_no_holder(tc, cell); |
e8088073 | 1982 | |
e5aea7b4 JT |
1983 | if (bio_end_sector(bio) <= tc->origin_size) |
1984 | remap_to_origin_and_issue(tc, bio); | |
1985 | ||
1986 | else if (bio->bi_iter.bi_sector < tc->origin_size) { | |
1987 | zero_fill_bio(bio); | |
1988 | bio->bi_iter.bi_size = (tc->origin_size - bio->bi_iter.bi_sector) << SECTOR_SHIFT; | |
1989 | remap_to_origin_and_issue(tc, bio); | |
1990 | ||
1991 | } else { | |
1992 | zero_fill_bio(bio); | |
4246a0b6 | 1993 | bio_endio(bio); |
e5aea7b4 | 1994 | } |
2dd9c257 JT |
1995 | } else |
1996 | provision_block(tc, bio, block, cell); | |
991d9fa0 JT |
1997 | break; |
1998 | ||
1999 | default: | |
c397741c MS |
2000 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
2001 | __func__, r); | |
f286ba0e | 2002 | cell_defer_no_holder(tc, cell); |
991d9fa0 JT |
2003 | bio_io_error(bio); |
2004 | break; | |
2005 | } | |
2006 | } | |
2007 | ||
a374bb21 JT |
2008 | static void process_bio(struct thin_c *tc, struct bio *bio) |
2009 | { | |
2010 | struct pool *pool = tc->pool; | |
2011 | dm_block_t block = get_bio_block(tc, bio); | |
2012 | struct dm_bio_prison_cell *cell; | |
2013 | struct dm_cell_key key; | |
2014 | ||
2015 | /* | |
2016 | * If cell is already occupied, then the block is already | |
2017 | * being provisioned so we have nothing further to do here. | |
2018 | */ | |
2019 | build_virtual_key(tc->td, block, &key); | |
2020 | if (bio_detain(pool, &key, bio, &cell)) | |
2021 | return; | |
2022 | ||
2023 | process_cell(tc, cell); | |
2024 | } | |
2025 | ||
2026 | static void __process_bio_read_only(struct thin_c *tc, struct bio *bio, | |
2027 | struct dm_bio_prison_cell *cell) | |
e49e5829 JT |
2028 | { |
2029 | int r; | |
2030 | int rw = bio_data_dir(bio); | |
2031 | dm_block_t block = get_bio_block(tc, bio); | |
2032 | struct dm_thin_lookup_result lookup_result; | |
2033 | ||
2034 | r = dm_thin_find_block(tc->td, block, 1, &lookup_result); | |
2035 | switch (r) { | |
2036 | case 0: | |
a374bb21 | 2037 | if (lookup_result.shared && (rw == WRITE) && bio->bi_iter.bi_size) { |
8c0f0e8c | 2038 | handle_unserviceable_bio(tc->pool, bio); |
a374bb21 JT |
2039 | if (cell) |
2040 | cell_defer_no_holder(tc, cell); | |
2041 | } else { | |
e8088073 | 2042 | inc_all_io_entry(tc->pool, bio); |
e49e5829 | 2043 | remap_and_issue(tc, bio, lookup_result.block); |
a374bb21 JT |
2044 | if (cell) |
2045 | inc_remap_and_issue_cell(tc, cell, lookup_result.block); | |
e8088073 | 2046 | } |
e49e5829 JT |
2047 | break; |
2048 | ||
2049 | case -ENODATA: | |
a374bb21 JT |
2050 | if (cell) |
2051 | cell_defer_no_holder(tc, cell); | |
e49e5829 | 2052 | if (rw != READ) { |
8c0f0e8c | 2053 | handle_unserviceable_bio(tc->pool, bio); |
e49e5829 JT |
2054 | break; |
2055 | } | |
2056 | ||
2057 | if (tc->origin_dev) { | |
e8088073 | 2058 | inc_all_io_entry(tc->pool, bio); |
e49e5829 JT |
2059 | remap_to_origin_and_issue(tc, bio); |
2060 | break; | |
2061 | } | |
2062 | ||
2063 | zero_fill_bio(bio); | |
4246a0b6 | 2064 | bio_endio(bio); |
e49e5829 JT |
2065 | break; |
2066 | ||
2067 | default: | |
c397741c MS |
2068 | DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", |
2069 | __func__, r); | |
a374bb21 JT |
2070 | if (cell) |
2071 | cell_defer_no_holder(tc, cell); | |
e49e5829 JT |
2072 | bio_io_error(bio); |
2073 | break; | |
2074 | } | |
2075 | } | |
2076 | ||
a374bb21 JT |
2077 | static void process_bio_read_only(struct thin_c *tc, struct bio *bio) |
2078 | { | |
2079 | __process_bio_read_only(tc, bio, NULL); | |
2080 | } | |
2081 | ||
2082 | static void process_cell_read_only(struct thin_c *tc, struct dm_bio_prison_cell *cell) | |
2083 | { | |
2084 | __process_bio_read_only(tc, cell->holder, cell); | |
2085 | } | |
2086 | ||
3e1a0699 JT |
2087 | static void process_bio_success(struct thin_c *tc, struct bio *bio) |
2088 | { | |
4246a0b6 | 2089 | bio_endio(bio); |
3e1a0699 JT |
2090 | } |
2091 | ||
e49e5829 JT |
2092 | static void process_bio_fail(struct thin_c *tc, struct bio *bio) |
2093 | { | |
2094 | bio_io_error(bio); | |
2095 | } | |
2096 | ||
a374bb21 JT |
2097 | static void process_cell_success(struct thin_c *tc, struct dm_bio_prison_cell *cell) |
2098 | { | |
2099 | cell_success(tc->pool, cell); | |
2100 | } | |
2101 | ||
2102 | static void process_cell_fail(struct thin_c *tc, struct dm_bio_prison_cell *cell) | |
2103 | { | |
2104 | cell_error(tc->pool, cell); | |
2105 | } | |
2106 | ||
ac8c3f3d JT |
2107 | /* |
2108 | * FIXME: should we also commit due to size of transaction, measured in | |
2109 | * metadata blocks? | |
2110 | */ | |
905e51b3 JT |
2111 | static int need_commit_due_to_time(struct pool *pool) |
2112 | { | |
0f30af98 MS |
2113 | return !time_in_range(jiffies, pool->last_commit_jiffies, |
2114 | pool->last_commit_jiffies + COMMIT_PERIOD); | |
905e51b3 JT |
2115 | } |
2116 | ||
67324ea1 MS |
2117 | #define thin_pbd(node) rb_entry((node), struct dm_thin_endio_hook, rb_node) |
2118 | #define thin_bio(pbd) dm_bio_from_per_bio_data((pbd), sizeof(struct dm_thin_endio_hook)) | |
2119 | ||
2120 | static void __thin_bio_rb_add(struct thin_c *tc, struct bio *bio) | |
2121 | { | |
2122 | struct rb_node **rbp, *parent; | |
2123 | struct dm_thin_endio_hook *pbd; | |
2124 | sector_t bi_sector = bio->bi_iter.bi_sector; | |
2125 | ||
2126 | rbp = &tc->sort_bio_list.rb_node; | |
2127 | parent = NULL; | |
2128 | while (*rbp) { | |
2129 | parent = *rbp; | |
2130 | pbd = thin_pbd(parent); | |
2131 | ||
2132 | if (bi_sector < thin_bio(pbd)->bi_iter.bi_sector) | |
2133 | rbp = &(*rbp)->rb_left; | |
2134 | else | |
2135 | rbp = &(*rbp)->rb_right; | |
2136 | } | |
2137 | ||
2138 | pbd = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); | |
2139 | rb_link_node(&pbd->rb_node, parent, rbp); | |
2140 | rb_insert_color(&pbd->rb_node, &tc->sort_bio_list); | |
2141 | } | |
2142 | ||
2143 | static void __extract_sorted_bios(struct thin_c *tc) | |
2144 | { | |
2145 | struct rb_node *node; | |
2146 | struct dm_thin_endio_hook *pbd; | |
2147 | struct bio *bio; | |
2148 | ||
2149 | for (node = rb_first(&tc->sort_bio_list); node; node = rb_next(node)) { | |
2150 | pbd = thin_pbd(node); | |
2151 | bio = thin_bio(pbd); | |
2152 | ||
2153 | bio_list_add(&tc->deferred_bio_list, bio); | |
2154 | rb_erase(&pbd->rb_node, &tc->sort_bio_list); | |
2155 | } | |
2156 | ||
2157 | WARN_ON(!RB_EMPTY_ROOT(&tc->sort_bio_list)); | |
2158 | } | |
2159 | ||
2160 | static void __sort_thin_deferred_bios(struct thin_c *tc) | |
2161 | { | |
2162 | struct bio *bio; | |
2163 | struct bio_list bios; | |
2164 | ||
2165 | bio_list_init(&bios); | |
2166 | bio_list_merge(&bios, &tc->deferred_bio_list); | |
2167 | bio_list_init(&tc->deferred_bio_list); | |
2168 | ||
2169 | /* Sort deferred_bio_list using rb-tree */ | |
2170 | while ((bio = bio_list_pop(&bios))) | |
2171 | __thin_bio_rb_add(tc, bio); | |
2172 | ||
2173 | /* | |
2174 | * Transfer the sorted bios in sort_bio_list back to | |
2175 | * deferred_bio_list to allow lockless submission of | |
2176 | * all bios. | |
2177 | */ | |
2178 | __extract_sorted_bios(tc); | |
2179 | } | |
2180 | ||
c140e1c4 | 2181 | static void process_thin_deferred_bios(struct thin_c *tc) |
991d9fa0 | 2182 | { |
c140e1c4 | 2183 | struct pool *pool = tc->pool; |
991d9fa0 JT |
2184 | unsigned long flags; |
2185 | struct bio *bio; | |
2186 | struct bio_list bios; | |
67324ea1 | 2187 | struct blk_plug plug; |
8a01a6af | 2188 | unsigned count = 0; |
991d9fa0 | 2189 | |
c140e1c4 | 2190 | if (tc->requeue_mode) { |
4e4cbee9 CH |
2191 | error_thin_bio_list(tc, &tc->deferred_bio_list, |
2192 | BLK_STS_DM_REQUEUE); | |
c140e1c4 MS |
2193 | return; |
2194 | } | |
2195 | ||
991d9fa0 JT |
2196 | bio_list_init(&bios); |
2197 | ||
c140e1c4 | 2198 | spin_lock_irqsave(&tc->lock, flags); |
67324ea1 MS |
2199 | |
2200 | if (bio_list_empty(&tc->deferred_bio_list)) { | |
2201 | spin_unlock_irqrestore(&tc->lock, flags); | |
2202 | return; | |
2203 | } | |
2204 | ||
2205 | __sort_thin_deferred_bios(tc); | |
2206 | ||
c140e1c4 MS |
2207 | bio_list_merge(&bios, &tc->deferred_bio_list); |
2208 | bio_list_init(&tc->deferred_bio_list); | |
67324ea1 | 2209 | |
c140e1c4 | 2210 | spin_unlock_irqrestore(&tc->lock, flags); |
991d9fa0 | 2211 | |
67324ea1 | 2212 | blk_start_plug(&plug); |
991d9fa0 | 2213 | while ((bio = bio_list_pop(&bios))) { |
991d9fa0 JT |
2214 | /* |
2215 | * If we've got no free new_mapping structs, and processing | |
2216 | * this bio might require one, we pause until there are some | |
2217 | * prepared mappings to process. | |
2218 | */ | |
2219 | if (ensure_next_mapping(pool)) { | |
c140e1c4 MS |
2220 | spin_lock_irqsave(&tc->lock, flags); |
2221 | bio_list_add(&tc->deferred_bio_list, bio); | |
2222 | bio_list_merge(&tc->deferred_bio_list, &bios); | |
2223 | spin_unlock_irqrestore(&tc->lock, flags); | |
991d9fa0 JT |
2224 | break; |
2225 | } | |
104655fd | 2226 | |
e6047149 | 2227 | if (bio_op(bio) == REQ_OP_DISCARD) |
e49e5829 | 2228 | pool->process_discard(tc, bio); |
104655fd | 2229 | else |
e49e5829 | 2230 | pool->process_bio(tc, bio); |
8a01a6af JT |
2231 | |
2232 | if ((count++ & 127) == 0) { | |
7d327fe0 | 2233 | throttle_work_update(&pool->throttle); |
8a01a6af JT |
2234 | dm_pool_issue_prefetches(pool->pmd); |
2235 | } | |
991d9fa0 | 2236 | } |
67324ea1 | 2237 | blk_finish_plug(&plug); |
c140e1c4 MS |
2238 | } |
2239 | ||
ac4c3f34 JT |
2240 | static int cmp_cells(const void *lhs, const void *rhs) |
2241 | { | |
2242 | struct dm_bio_prison_cell *lhs_cell = *((struct dm_bio_prison_cell **) lhs); | |
2243 | struct dm_bio_prison_cell *rhs_cell = *((struct dm_bio_prison_cell **) rhs); | |
2244 | ||
2245 | BUG_ON(!lhs_cell->holder); | |
2246 | BUG_ON(!rhs_cell->holder); | |
2247 | ||
2248 | if (lhs_cell->holder->bi_iter.bi_sector < rhs_cell->holder->bi_iter.bi_sector) | |
2249 | return -1; | |
2250 | ||
2251 | if (lhs_cell->holder->bi_iter.bi_sector > rhs_cell->holder->bi_iter.bi_sector) | |
2252 | return 1; | |
2253 | ||
2254 | return 0; | |
2255 | } | |
2256 | ||
2257 | static unsigned sort_cells(struct pool *pool, struct list_head *cells) | |
2258 | { | |
2259 | unsigned count = 0; | |
2260 | struct dm_bio_prison_cell *cell, *tmp; | |
2261 | ||
2262 | list_for_each_entry_safe(cell, tmp, cells, user_list) { | |
2263 | if (count >= CELL_SORT_ARRAY_SIZE) | |
2264 | break; | |
2265 | ||
2266 | pool->cell_sort_array[count++] = cell; | |
2267 | list_del(&cell->user_list); | |
2268 | } | |
2269 | ||
2270 | sort(pool->cell_sort_array, count, sizeof(cell), cmp_cells, NULL); | |
2271 | ||
2272 | return count; | |
2273 | } | |
2274 | ||
a374bb21 JT |
2275 | static void process_thin_deferred_cells(struct thin_c *tc) |
2276 | { | |
2277 | struct pool *pool = tc->pool; | |
2278 | unsigned long flags; | |
2279 | struct list_head cells; | |
ac4c3f34 JT |
2280 | struct dm_bio_prison_cell *cell; |
2281 | unsigned i, j, count; | |
a374bb21 JT |
2282 | |
2283 | INIT_LIST_HEAD(&cells); | |
2284 | ||
2285 | spin_lock_irqsave(&tc->lock, flags); | |
2286 | list_splice_init(&tc->deferred_cells, &cells); | |
2287 | spin_unlock_irqrestore(&tc->lock, flags); | |
2288 | ||
2289 | if (list_empty(&cells)) | |
2290 | return; | |
2291 | ||
ac4c3f34 JT |
2292 | do { |
2293 | count = sort_cells(tc->pool, &cells); | |
a374bb21 | 2294 | |
ac4c3f34 JT |
2295 | for (i = 0; i < count; i++) { |
2296 | cell = pool->cell_sort_array[i]; | |
2297 | BUG_ON(!cell->holder); | |
a374bb21 | 2298 | |
ac4c3f34 JT |
2299 | /* |
2300 | * If we've got no free new_mapping structs, and processing | |
2301 | * this bio might require one, we pause until there are some | |
2302 | * prepared mappings to process. | |
2303 | */ | |
2304 | if (ensure_next_mapping(pool)) { | |
2305 | for (j = i; j < count; j++) | |
2306 | list_add(&pool->cell_sort_array[j]->user_list, &cells); | |
2307 | ||
2308 | spin_lock_irqsave(&tc->lock, flags); | |
2309 | list_splice(&cells, &tc->deferred_cells); | |
2310 | spin_unlock_irqrestore(&tc->lock, flags); | |
2311 | return; | |
2312 | } | |
2313 | ||
e6047149 | 2314 | if (bio_op(cell->holder) == REQ_OP_DISCARD) |
ac4c3f34 JT |
2315 | pool->process_discard_cell(tc, cell); |
2316 | else | |
2317 | pool->process_cell(tc, cell); | |
2318 | } | |
2319 | } while (!list_empty(&cells)); | |
a374bb21 JT |
2320 | } |
2321 | ||
b10ebd34 JT |
2322 | static void thin_get(struct thin_c *tc); |
2323 | static void thin_put(struct thin_c *tc); | |
2324 | ||
2325 | /* | |
2326 | * We can't hold rcu_read_lock() around code that can block. So we | |
2327 | * find a thin with the rcu lock held; bump a refcount; then drop | |
2328 | * the lock. | |
2329 | */ | |
2330 | static struct thin_c *get_first_thin(struct pool *pool) | |
2331 | { | |
2332 | struct thin_c *tc = NULL; | |
2333 | ||
2334 | rcu_read_lock(); | |
2335 | if (!list_empty(&pool->active_thins)) { | |
2336 | tc = list_entry_rcu(pool->active_thins.next, struct thin_c, list); | |
2337 | thin_get(tc); | |
2338 | } | |
2339 | rcu_read_unlock(); | |
2340 | ||
2341 | return tc; | |
2342 | } | |
2343 | ||
2344 | static struct thin_c *get_next_thin(struct pool *pool, struct thin_c *tc) | |
2345 | { | |
2346 | struct thin_c *old_tc = tc; | |
2347 | ||
2348 | rcu_read_lock(); | |
2349 | list_for_each_entry_continue_rcu(tc, &pool->active_thins, list) { | |
2350 | thin_get(tc); | |
2351 | thin_put(old_tc); | |
2352 | rcu_read_unlock(); | |
2353 | return tc; | |
2354 | } | |
2355 | thin_put(old_tc); | |
2356 | rcu_read_unlock(); | |
2357 | ||
2358 | return NULL; | |
2359 | } | |
2360 | ||
c140e1c4 MS |
2361 | static void process_deferred_bios(struct pool *pool) |
2362 | { | |
2363 | unsigned long flags; | |
2364 | struct bio *bio; | |
e36827df | 2365 | struct bio_list bios, bio_completions; |
c140e1c4 MS |
2366 | struct thin_c *tc; |
2367 | ||
b10ebd34 JT |
2368 | tc = get_first_thin(pool); |
2369 | while (tc) { | |
a374bb21 | 2370 | process_thin_deferred_cells(tc); |
c140e1c4 | 2371 | process_thin_deferred_bios(tc); |
b10ebd34 JT |
2372 | tc = get_next_thin(pool, tc); |
2373 | } | |
991d9fa0 JT |
2374 | |
2375 | /* | |
e36827df NT |
2376 | * If there are any deferred flush bios, we must commit the metadata |
2377 | * before issuing them or signaling their completion. | |
991d9fa0 JT |
2378 | */ |
2379 | bio_list_init(&bios); | |
e36827df NT |
2380 | bio_list_init(&bio_completions); |
2381 | ||
991d9fa0 JT |
2382 | spin_lock_irqsave(&pool->lock, flags); |
2383 | bio_list_merge(&bios, &pool->deferred_flush_bios); | |
2384 | bio_list_init(&pool->deferred_flush_bios); | |
e36827df NT |
2385 | |
2386 | bio_list_merge(&bio_completions, &pool->deferred_flush_completions); | |
2387 | bio_list_init(&pool->deferred_flush_completions); | |
991d9fa0 JT |
2388 | spin_unlock_irqrestore(&pool->lock, flags); |
2389 | ||
e36827df | 2390 | if (bio_list_empty(&bios) && bio_list_empty(&bio_completions) && |
4d1662a3 | 2391 | !(dm_pool_changed_this_transaction(pool->pmd) && need_commit_due_to_time(pool))) |
991d9fa0 JT |
2392 | return; |
2393 | ||
020cc3b5 | 2394 | if (commit(pool)) { |
e36827df NT |
2395 | bio_list_merge(&bios, &bio_completions); |
2396 | ||
991d9fa0 JT |
2397 | while ((bio = bio_list_pop(&bios))) |
2398 | bio_io_error(bio); | |
2399 | return; | |
2400 | } | |
905e51b3 | 2401 | pool->last_commit_jiffies = jiffies; |
991d9fa0 | 2402 | |
e36827df NT |
2403 | while ((bio = bio_list_pop(&bio_completions))) |
2404 | bio_endio(bio); | |
2405 | ||
991d9fa0 JT |
2406 | while ((bio = bio_list_pop(&bios))) |
2407 | generic_make_request(bio); | |
2408 | } | |
2409 | ||
2410 | static void do_worker(struct work_struct *ws) | |
2411 | { | |
2412 | struct pool *pool = container_of(ws, struct pool, worker); | |
2413 | ||
7d327fe0 | 2414 | throttle_work_start(&pool->throttle); |
8a01a6af | 2415 | dm_pool_issue_prefetches(pool->pmd); |
7d327fe0 | 2416 | throttle_work_update(&pool->throttle); |
e49e5829 | 2417 | process_prepared(pool, &pool->prepared_mappings, &pool->process_prepared_mapping); |
7d327fe0 | 2418 | throttle_work_update(&pool->throttle); |
e49e5829 | 2419 | process_prepared(pool, &pool->prepared_discards, &pool->process_prepared_discard); |
7d327fe0 | 2420 | throttle_work_update(&pool->throttle); |
2a0fbffb JT |
2421 | process_prepared(pool, &pool->prepared_discards_pt2, &pool->process_prepared_discard_pt2); |
2422 | throttle_work_update(&pool->throttle); | |
991d9fa0 | 2423 | process_deferred_bios(pool); |
7d327fe0 | 2424 | throttle_work_complete(&pool->throttle); |
991d9fa0 JT |
2425 | } |
2426 | ||
905e51b3 JT |
2427 | /* |
2428 | * We want to commit periodically so that not too much | |
2429 | * unwritten data builds up. | |
2430 | */ | |
2431 | static void do_waker(struct work_struct *ws) | |
2432 | { | |
2433 | struct pool *pool = container_of(to_delayed_work(ws), struct pool, waker); | |
2434 | wake_worker(pool); | |
2435 | queue_delayed_work(pool->wq, &pool->waker, COMMIT_PERIOD); | |
2436 | } | |
2437 | ||
85ad643b JT |
2438 | /* |
2439 | * We're holding onto IO to allow userland time to react. After the | |
2440 | * timeout either the pool will have been resized (and thus back in | |
bcc696fa | 2441 | * PM_WRITE mode), or we degrade to PM_OUT_OF_DATA_SPACE w/ error_if_no_space. |
85ad643b JT |
2442 | */ |
2443 | static void do_no_space_timeout(struct work_struct *ws) | |
2444 | { | |
2445 | struct pool *pool = container_of(to_delayed_work(ws), struct pool, | |
2446 | no_space_timeout); | |
2447 | ||
bcc696fa MS |
2448 | if (get_pool_mode(pool) == PM_OUT_OF_DATA_SPACE && !pool->pf.error_if_no_space) { |
2449 | pool->pf.error_if_no_space = true; | |
36b67894 | 2450 | notify_of_pool_mode_change(pool); |
4e4cbee9 | 2451 | error_retry_list_with_code(pool, BLK_STS_NOSPC); |
bcc696fa | 2452 | } |
85ad643b JT |
2453 | } |
2454 | ||
991d9fa0 JT |
2455 | /*----------------------------------------------------------------*/ |
2456 | ||
e7a3e871 | 2457 | struct pool_work { |
738211f7 | 2458 | struct work_struct worker; |
e7a3e871 JT |
2459 | struct completion complete; |
2460 | }; | |
2461 | ||
2462 | static struct pool_work *to_pool_work(struct work_struct *ws) | |
2463 | { | |
2464 | return container_of(ws, struct pool_work, worker); | |
2465 | } | |
2466 | ||
2467 | static void pool_work_complete(struct pool_work *pw) | |
2468 | { | |
2469 | complete(&pw->complete); | |
2470 | } | |
738211f7 | 2471 | |
e7a3e871 JT |
2472 | static void pool_work_wait(struct pool_work *pw, struct pool *pool, |
2473 | void (*fn)(struct work_struct *)) | |
2474 | { | |
2475 | INIT_WORK_ONSTACK(&pw->worker, fn); | |
2476 | init_completion(&pw->complete); | |
2477 | queue_work(pool->wq, &pw->worker); | |
2478 | wait_for_completion(&pw->complete); | |
2479 | } | |
2480 | ||
2481 | /*----------------------------------------------------------------*/ | |
2482 | ||
2483 | struct noflush_work { | |
2484 | struct pool_work pw; | |
2485 | struct thin_c *tc; | |
738211f7 JT |
2486 | }; |
2487 | ||
e7a3e871 | 2488 | static struct noflush_work *to_noflush(struct work_struct *ws) |
738211f7 | 2489 | { |
e7a3e871 | 2490 | return container_of(to_pool_work(ws), struct noflush_work, pw); |
738211f7 JT |
2491 | } |
2492 | ||
2493 | static void do_noflush_start(struct work_struct *ws) | |
2494 | { | |
e7a3e871 | 2495 | struct noflush_work *w = to_noflush(ws); |
738211f7 JT |
2496 | w->tc->requeue_mode = true; |
2497 | requeue_io(w->tc); | |
e7a3e871 | 2498 | pool_work_complete(&w->pw); |
738211f7 JT |
2499 | } |
2500 | ||
2501 | static void do_noflush_stop(struct work_struct *ws) | |
2502 | { | |
e7a3e871 | 2503 | struct noflush_work *w = to_noflush(ws); |
738211f7 | 2504 | w->tc->requeue_mode = false; |
e7a3e871 | 2505 | pool_work_complete(&w->pw); |
738211f7 JT |
2506 | } |
2507 | ||
2508 | static void noflush_work(struct thin_c *tc, void (*fn)(struct work_struct *)) | |
2509 | { | |
2510 | struct noflush_work w; | |
2511 | ||
738211f7 | 2512 | w.tc = tc; |
e7a3e871 | 2513 | pool_work_wait(&w.pw, tc->pool, fn); |
738211f7 JT |
2514 | } |
2515 | ||
2516 | /*----------------------------------------------------------------*/ | |
2517 | ||
34fbcf62 JT |
2518 | static bool passdown_enabled(struct pool_c *pt) |
2519 | { | |
2520 | return pt->adjusted_pf.discard_passdown; | |
2521 | } | |
2522 | ||
2523 | static void set_discard_callbacks(struct pool *pool) | |
2524 | { | |
2525 | struct pool_c *pt = pool->ti->private; | |
2526 | ||
2527 | if (passdown_enabled(pt)) { | |
2528 | pool->process_discard_cell = process_discard_cell_passdown; | |
2a0fbffb JT |
2529 | pool->process_prepared_discard = process_prepared_discard_passdown_pt1; |
2530 | pool->process_prepared_discard_pt2 = process_prepared_discard_passdown_pt2; | |
34fbcf62 JT |
2531 | } else { |
2532 | pool->process_discard_cell = process_discard_cell_no_passdown; | |
2533 | pool->process_prepared_discard = process_prepared_discard_no_passdown; | |
2534 | } | |
2535 | } | |
2536 | ||
8b64e881 | 2537 | static void set_pool_mode(struct pool *pool, enum pool_mode new_mode) |
e49e5829 | 2538 | { |
cdc2b415 | 2539 | struct pool_c *pt = pool->ti->private; |
07f2b6e0 MS |
2540 | bool needs_check = dm_pool_metadata_needs_check(pool->pmd); |
2541 | enum pool_mode old_mode = get_pool_mode(pool); | |
6aa7de05 | 2542 | unsigned long no_space_timeout = READ_ONCE(no_space_timeout_secs) * HZ; |
07f2b6e0 MS |
2543 | |
2544 | /* | |
2545 | * Never allow the pool to transition to PM_WRITE mode if user | |
2546 | * intervention is required to verify metadata and data consistency. | |
2547 | */ | |
2548 | if (new_mode == PM_WRITE && needs_check) { | |
2549 | DMERR("%s: unable to switch pool to write mode until repaired.", | |
2550 | dm_device_name(pool->pool_md)); | |
2551 | if (old_mode != new_mode) | |
2552 | new_mode = old_mode; | |
2553 | else | |
2554 | new_mode = PM_READ_ONLY; | |
2555 | } | |
2556 | /* | |
2557 | * If we were in PM_FAIL mode, rollback of metadata failed. We're | |
2558 | * not going to recover without a thin_repair. So we never let the | |
2559 | * pool move out of the old mode. | |
2560 | */ | |
2561 | if (old_mode == PM_FAIL) | |
2562 | new_mode = old_mode; | |
e49e5829 | 2563 | |
8b64e881 | 2564 | switch (new_mode) { |
e49e5829 | 2565 | case PM_FAIL: |
5383ef3a | 2566 | dm_pool_metadata_read_only(pool->pmd); |
e49e5829 JT |
2567 | pool->process_bio = process_bio_fail; |
2568 | pool->process_discard = process_bio_fail; | |
a374bb21 JT |
2569 | pool->process_cell = process_cell_fail; |
2570 | pool->process_discard_cell = process_cell_fail; | |
e49e5829 JT |
2571 | pool->process_prepared_mapping = process_prepared_mapping_fail; |
2572 | pool->process_prepared_discard = process_prepared_discard_fail; | |
3e1a0699 JT |
2573 | |
2574 | error_retry_list(pool); | |
e49e5829 JT |
2575 | break; |
2576 | ||
7e420796 | 2577 | case PM_OUT_OF_METADATA_SPACE: |
e49e5829 | 2578 | case PM_READ_ONLY: |
3e1a0699 JT |
2579 | dm_pool_metadata_read_only(pool->pmd); |
2580 | pool->process_bio = process_bio_read_only; | |
2581 | pool->process_discard = process_bio_success; | |
a374bb21 JT |
2582 | pool->process_cell = process_cell_read_only; |
2583 | pool->process_discard_cell = process_cell_success; | |
3e1a0699 | 2584 | pool->process_prepared_mapping = process_prepared_mapping_fail; |
34fbcf62 | 2585 | pool->process_prepared_discard = process_prepared_discard_success; |
3e1a0699 JT |
2586 | |
2587 | error_retry_list(pool); | |
2588 | break; | |
2589 | ||
2590 | case PM_OUT_OF_DATA_SPACE: | |
2591 | /* | |
2592 | * Ideally we'd never hit this state; the low water mark | |
2593 | * would trigger userland to extend the pool before we | |
2594 | * completely run out of data space. However, many small | |
2595 | * IOs to unprovisioned space can consume data space at an | |
2596 | * alarming rate. Adjust your low water mark if you're | |
2597 | * frequently seeing this mode. | |
2598 | */ | |
c3667cc6 | 2599 | pool->out_of_data_space = true; |
3e1a0699 | 2600 | pool->process_bio = process_bio_read_only; |
a374bb21 JT |
2601 | pool->process_discard = process_discard_bio; |
2602 | pool->process_cell = process_cell_read_only; | |
3e1a0699 | 2603 | pool->process_prepared_mapping = process_prepared_mapping; |
34fbcf62 | 2604 | set_discard_callbacks(pool); |
85ad643b | 2605 | |
80c57893 MS |
2606 | if (!pool->pf.error_if_no_space && no_space_timeout) |
2607 | queue_delayed_work(pool->wq, &pool->no_space_timeout, no_space_timeout); | |
e49e5829 JT |
2608 | break; |
2609 | ||
2610 | case PM_WRITE: | |
1efeb859 HT |
2611 | if (old_mode == PM_OUT_OF_DATA_SPACE) |
2612 | cancel_delayed_work_sync(&pool->no_space_timeout); | |
c3667cc6 | 2613 | pool->out_of_data_space = false; |
172c2386 | 2614 | pool->pf.error_if_no_space = pt->requested_pf.error_if_no_space; |
9b7aaa64 | 2615 | dm_pool_metadata_read_write(pool->pmd); |
e49e5829 | 2616 | pool->process_bio = process_bio; |
a374bb21 JT |
2617 | pool->process_discard = process_discard_bio; |
2618 | pool->process_cell = process_cell; | |
e49e5829 | 2619 | pool->process_prepared_mapping = process_prepared_mapping; |
34fbcf62 | 2620 | set_discard_callbacks(pool); |
e49e5829 JT |
2621 | break; |
2622 | } | |
8b64e881 MS |
2623 | |
2624 | pool->pf.mode = new_mode; | |
cdc2b415 MS |
2625 | /* |
2626 | * The pool mode may have changed, sync it so bind_control_target() | |
2627 | * doesn't cause an unexpected mode transition on resume. | |
2628 | */ | |
2629 | pt->adjusted_pf.mode = new_mode; | |
36b67894 MS |
2630 | |
2631 | if (old_mode != new_mode) | |
2632 | notify_of_pool_mode_change(pool); | |
e49e5829 JT |
2633 | } |
2634 | ||
07f2b6e0 | 2635 | static void abort_transaction(struct pool *pool) |
b5330655 | 2636 | { |
07f2b6e0 MS |
2637 | const char *dev_name = dm_device_name(pool->pool_md); |
2638 | ||
2639 | DMERR_LIMIT("%s: aborting current metadata transaction", dev_name); | |
2640 | if (dm_pool_abort_metadata(pool->pmd)) { | |
2641 | DMERR("%s: failed to abort metadata transaction", dev_name); | |
2642 | set_pool_mode(pool, PM_FAIL); | |
2643 | } | |
2644 | ||
2645 | if (dm_pool_metadata_set_needs_check(pool->pmd)) { | |
2646 | DMERR("%s: failed to set 'needs_check' flag in metadata", dev_name); | |
2647 | set_pool_mode(pool, PM_FAIL); | |
2648 | } | |
2649 | } | |
399caddf | 2650 | |
07f2b6e0 MS |
2651 | static void metadata_operation_failed(struct pool *pool, const char *op, int r) |
2652 | { | |
b5330655 JT |
2653 | DMERR_LIMIT("%s: metadata operation '%s' failed: error = %d", |
2654 | dm_device_name(pool->pool_md), op, r); | |
2655 | ||
07f2b6e0 | 2656 | abort_transaction(pool); |
b5330655 JT |
2657 | set_pool_mode(pool, PM_READ_ONLY); |
2658 | } | |
2659 | ||
e49e5829 JT |
2660 | /*----------------------------------------------------------------*/ |
2661 | ||
991d9fa0 JT |
2662 | /* |
2663 | * Mapping functions. | |
2664 | */ | |
2665 | ||
2666 | /* | |
2667 | * Called only while mapping a thin bio to hand it over to the workqueue. | |
2668 | */ | |
2669 | static void thin_defer_bio(struct thin_c *tc, struct bio *bio) | |
2670 | { | |
2671 | unsigned long flags; | |
2672 | struct pool *pool = tc->pool; | |
2673 | ||
c140e1c4 MS |
2674 | spin_lock_irqsave(&tc->lock, flags); |
2675 | bio_list_add(&tc->deferred_bio_list, bio); | |
2676 | spin_unlock_irqrestore(&tc->lock, flags); | |
991d9fa0 JT |
2677 | |
2678 | wake_worker(pool); | |
2679 | } | |
2680 | ||
7d327fe0 JT |
2681 | static void thin_defer_bio_with_throttle(struct thin_c *tc, struct bio *bio) |
2682 | { | |
2683 | struct pool *pool = tc->pool; | |
2684 | ||
2685 | throttle_lock(&pool->throttle); | |
2686 | thin_defer_bio(tc, bio); | |
2687 | throttle_unlock(&pool->throttle); | |
2688 | } | |
2689 | ||
a374bb21 JT |
2690 | static void thin_defer_cell(struct thin_c *tc, struct dm_bio_prison_cell *cell) |
2691 | { | |
2692 | unsigned long flags; | |
2693 | struct pool *pool = tc->pool; | |
2694 | ||
2695 | throttle_lock(&pool->throttle); | |
2696 | spin_lock_irqsave(&tc->lock, flags); | |
2697 | list_add_tail(&cell->user_list, &tc->deferred_cells); | |
2698 | spin_unlock_irqrestore(&tc->lock, flags); | |
2699 | throttle_unlock(&pool->throttle); | |
2700 | ||
2701 | wake_worker(pool); | |
2702 | } | |
2703 | ||
59c3d2c6 | 2704 | static void thin_hook_bio(struct thin_c *tc, struct bio *bio) |
eb2aa48d | 2705 | { |
59c3d2c6 | 2706 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
eb2aa48d JT |
2707 | |
2708 | h->tc = tc; | |
2709 | h->shared_read_entry = NULL; | |
e8088073 | 2710 | h->all_io_entry = NULL; |
eb2aa48d | 2711 | h->overwrite_mapping = NULL; |
34fbcf62 | 2712 | h->cell = NULL; |
eb2aa48d JT |
2713 | } |
2714 | ||
991d9fa0 JT |
2715 | /* |
2716 | * Non-blocking function called from the thin target's map function. | |
2717 | */ | |
7de3ee57 | 2718 | static int thin_bio_map(struct dm_target *ti, struct bio *bio) |
991d9fa0 JT |
2719 | { |
2720 | int r; | |
2721 | struct thin_c *tc = ti->private; | |
2722 | dm_block_t block = get_bio_block(tc, bio); | |
2723 | struct dm_thin_device *td = tc->td; | |
2724 | struct dm_thin_lookup_result result; | |
a374bb21 | 2725 | struct dm_bio_prison_cell *virt_cell, *data_cell; |
e8088073 | 2726 | struct dm_cell_key key; |
991d9fa0 | 2727 | |
59c3d2c6 | 2728 | thin_hook_bio(tc, bio); |
e49e5829 | 2729 | |
738211f7 | 2730 | if (tc->requeue_mode) { |
4e4cbee9 | 2731 | bio->bi_status = BLK_STS_DM_REQUEUE; |
4246a0b6 | 2732 | bio_endio(bio); |
738211f7 JT |
2733 | return DM_MAPIO_SUBMITTED; |
2734 | } | |
2735 | ||
e49e5829 JT |
2736 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
2737 | bio_io_error(bio); | |
2738 | return DM_MAPIO_SUBMITTED; | |
2739 | } | |
2740 | ||
f73f44eb | 2741 | if (op_is_flush(bio->bi_opf) || bio_op(bio) == REQ_OP_DISCARD) { |
7d327fe0 | 2742 | thin_defer_bio_with_throttle(tc, bio); |
991d9fa0 JT |
2743 | return DM_MAPIO_SUBMITTED; |
2744 | } | |
2745 | ||
c822ed96 JT |
2746 | /* |
2747 | * We must hold the virtual cell before doing the lookup, otherwise | |
2748 | * there's a race with discard. | |
2749 | */ | |
2750 | build_virtual_key(tc->td, block, &key); | |
a374bb21 | 2751 | if (bio_detain(tc->pool, &key, bio, &virt_cell)) |
c822ed96 JT |
2752 | return DM_MAPIO_SUBMITTED; |
2753 | ||
991d9fa0 JT |
2754 | r = dm_thin_find_block(td, block, 0, &result); |
2755 | ||
2756 | /* | |
2757 | * Note that we defer readahead too. | |
2758 | */ | |
2759 | switch (r) { | |
2760 | case 0: | |
2761 | if (unlikely(result.shared)) { | |
2762 | /* | |
2763 | * We have a race condition here between the | |
2764 | * result.shared value returned by the lookup and | |
2765 | * snapshot creation, which may cause new | |
2766 | * sharing. | |
2767 | * | |
2768 | * To avoid this always quiesce the origin before | |
2769 | * taking the snap. You want to do this anyway to | |
2770 | * ensure a consistent application view | |
2771 | * (i.e. lockfs). | |
2772 | * | |
2773 | * More distant ancestors are irrelevant. The | |
2774 | * shared flag will be set in their case. | |
2775 | */ | |
a374bb21 | 2776 | thin_defer_cell(tc, virt_cell); |
e8088073 | 2777 | return DM_MAPIO_SUBMITTED; |
991d9fa0 | 2778 | } |
e8088073 | 2779 | |
e8088073 | 2780 | build_data_key(tc->td, result.block, &key); |
a374bb21 JT |
2781 | if (bio_detain(tc->pool, &key, bio, &data_cell)) { |
2782 | cell_defer_no_holder(tc, virt_cell); | |
e8088073 JT |
2783 | return DM_MAPIO_SUBMITTED; |
2784 | } | |
2785 | ||
2786 | inc_all_io_entry(tc->pool, bio); | |
a374bb21 JT |
2787 | cell_defer_no_holder(tc, data_cell); |
2788 | cell_defer_no_holder(tc, virt_cell); | |
e8088073 JT |
2789 | |
2790 | remap(tc, bio, result.block); | |
2791 | return DM_MAPIO_REMAPPED; | |
991d9fa0 JT |
2792 | |
2793 | case -ENODATA: | |
e49e5829 | 2794 | case -EWOULDBLOCK: |
a374bb21 | 2795 | thin_defer_cell(tc, virt_cell); |
2aab3850 | 2796 | return DM_MAPIO_SUBMITTED; |
e49e5829 JT |
2797 | |
2798 | default: | |
2799 | /* | |
2800 | * Must always call bio_io_error on failure. | |
2801 | * dm_thin_find_block can fail with -EINVAL if the | |
2802 | * pool is switched to fail-io mode. | |
2803 | */ | |
2804 | bio_io_error(bio); | |
a374bb21 | 2805 | cell_defer_no_holder(tc, virt_cell); |
2aab3850 | 2806 | return DM_MAPIO_SUBMITTED; |
991d9fa0 | 2807 | } |
991d9fa0 JT |
2808 | } |
2809 | ||
2810 | static int pool_is_congested(struct dm_target_callbacks *cb, int bdi_bits) | |
2811 | { | |
991d9fa0 | 2812 | struct pool_c *pt = container_of(cb, struct pool_c, callbacks); |
760fe67e | 2813 | struct request_queue *q; |
991d9fa0 | 2814 | |
760fe67e MS |
2815 | if (get_pool_mode(pt->pool) == PM_OUT_OF_DATA_SPACE) |
2816 | return 1; | |
991d9fa0 | 2817 | |
760fe67e | 2818 | q = bdev_get_queue(pt->data_dev->bdev); |
dc3b17cc | 2819 | return bdi_congested(q->backing_dev_info, bdi_bits); |
991d9fa0 JT |
2820 | } |
2821 | ||
c140e1c4 | 2822 | static void requeue_bios(struct pool *pool) |
991d9fa0 | 2823 | { |
c140e1c4 MS |
2824 | unsigned long flags; |
2825 | struct thin_c *tc; | |
2826 | ||
2827 | rcu_read_lock(); | |
2828 | list_for_each_entry_rcu(tc, &pool->active_thins, list) { | |
2829 | spin_lock_irqsave(&tc->lock, flags); | |
2830 | bio_list_merge(&tc->deferred_bio_list, &tc->retry_on_resume_list); | |
2831 | bio_list_init(&tc->retry_on_resume_list); | |
2832 | spin_unlock_irqrestore(&tc->lock, flags); | |
2833 | } | |
2834 | rcu_read_unlock(); | |
991d9fa0 JT |
2835 | } |
2836 | ||
2837 | /*---------------------------------------------------------------- | |
2838 | * Binding of control targets to a pool object | |
2839 | *--------------------------------------------------------------*/ | |
9bc142dd MS |
2840 | static bool data_dev_supports_discard(struct pool_c *pt) |
2841 | { | |
2842 | struct request_queue *q = bdev_get_queue(pt->data_dev->bdev); | |
2843 | ||
2844 | return q && blk_queue_discard(q); | |
2845 | } | |
2846 | ||
58051b94 JT |
2847 | static bool is_factor(sector_t block_size, uint32_t n) |
2848 | { | |
2849 | return !sector_div(block_size, n); | |
2850 | } | |
2851 | ||
9bc142dd MS |
2852 | /* |
2853 | * If discard_passdown was enabled verify that the data device | |
0424caa1 | 2854 | * supports discards. Disable discard_passdown if not. |
9bc142dd | 2855 | */ |
0424caa1 | 2856 | static void disable_passdown_if_not_supported(struct pool_c *pt) |
9bc142dd | 2857 | { |
0424caa1 MS |
2858 | struct pool *pool = pt->pool; |
2859 | struct block_device *data_bdev = pt->data_dev->bdev; | |
2860 | struct queue_limits *data_limits = &bdev_get_queue(data_bdev)->limits; | |
0424caa1 | 2861 | const char *reason = NULL; |
9bc142dd MS |
2862 | char buf[BDEVNAME_SIZE]; |
2863 | ||
0424caa1 | 2864 | if (!pt->adjusted_pf.discard_passdown) |
9bc142dd MS |
2865 | return; |
2866 | ||
0424caa1 MS |
2867 | if (!data_dev_supports_discard(pt)) |
2868 | reason = "discard unsupported"; | |
2869 | ||
2870 | else if (data_limits->max_discard_sectors < pool->sectors_per_block) | |
2871 | reason = "max discard sectors smaller than a block"; | |
9bc142dd | 2872 | |
0424caa1 MS |
2873 | if (reason) { |
2874 | DMWARN("Data device (%s) %s: Disabling discard passdown.", bdevname(data_bdev, buf), reason); | |
2875 | pt->adjusted_pf.discard_passdown = false; | |
2876 | } | |
9bc142dd MS |
2877 | } |
2878 | ||
991d9fa0 JT |
2879 | static int bind_control_target(struct pool *pool, struct dm_target *ti) |
2880 | { | |
2881 | struct pool_c *pt = ti->private; | |
2882 | ||
e49e5829 | 2883 | /* |
9b7aaa64 | 2884 | * We want to make sure that a pool in PM_FAIL mode is never upgraded. |
e49e5829 | 2885 | */ |
07f2b6e0 | 2886 | enum pool_mode old_mode = get_pool_mode(pool); |
0424caa1 | 2887 | enum pool_mode new_mode = pt->adjusted_pf.mode; |
e49e5829 | 2888 | |
8b64e881 MS |
2889 | /* |
2890 | * Don't change the pool's mode until set_pool_mode() below. | |
2891 | * Otherwise the pool's process_* function pointers may | |
2892 | * not match the desired pool mode. | |
2893 | */ | |
2894 | pt->adjusted_pf.mode = old_mode; | |
2895 | ||
2896 | pool->ti = ti; | |
2897 | pool->pf = pt->adjusted_pf; | |
2898 | pool->low_water_blocks = pt->low_water_blocks; | |
2899 | ||
9bc142dd | 2900 | set_pool_mode(pool, new_mode); |
f402693d | 2901 | |
991d9fa0 JT |
2902 | return 0; |
2903 | } | |
2904 | ||
2905 | static void unbind_control_target(struct pool *pool, struct dm_target *ti) | |
2906 | { | |
2907 | if (pool->ti == ti) | |
2908 | pool->ti = NULL; | |
2909 | } | |
2910 | ||
2911 | /*---------------------------------------------------------------- | |
2912 | * Pool creation | |
2913 | *--------------------------------------------------------------*/ | |
67e2e2b2 JT |
2914 | /* Initialize pool features. */ |
2915 | static void pool_features_init(struct pool_features *pf) | |
2916 | { | |
e49e5829 | 2917 | pf->mode = PM_WRITE; |
9bc142dd MS |
2918 | pf->zero_new_blocks = true; |
2919 | pf->discard_enabled = true; | |
2920 | pf->discard_passdown = true; | |
787a996c | 2921 | pf->error_if_no_space = false; |
67e2e2b2 JT |
2922 | } |
2923 | ||
991d9fa0 JT |
2924 | static void __pool_destroy(struct pool *pool) |
2925 | { | |
2926 | __pool_table_remove(pool); | |
2927 | ||
a822c83e | 2928 | vfree(pool->cell_sort_array); |
991d9fa0 JT |
2929 | if (dm_pool_metadata_close(pool->pmd) < 0) |
2930 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); | |
2931 | ||
44feb387 | 2932 | dm_bio_prison_destroy(pool->prison); |
991d9fa0 JT |
2933 | dm_kcopyd_client_destroy(pool->copier); |
2934 | ||
2935 | if (pool->wq) | |
2936 | destroy_workqueue(pool->wq); | |
2937 | ||
2938 | if (pool->next_mapping) | |
2939 | mempool_free(pool->next_mapping, pool->mapping_pool); | |
2940 | mempool_destroy(pool->mapping_pool); | |
44feb387 MS |
2941 | dm_deferred_set_destroy(pool->shared_read_ds); |
2942 | dm_deferred_set_destroy(pool->all_io_ds); | |
991d9fa0 JT |
2943 | kfree(pool); |
2944 | } | |
2945 | ||
a24c2569 | 2946 | static struct kmem_cache *_new_mapping_cache; |
a24c2569 | 2947 | |
991d9fa0 JT |
2948 | static struct pool *pool_create(struct mapped_device *pool_md, |
2949 | struct block_device *metadata_dev, | |
e49e5829 JT |
2950 | unsigned long block_size, |
2951 | int read_only, char **error) | |
991d9fa0 JT |
2952 | { |
2953 | int r; | |
2954 | void *err_p; | |
2955 | struct pool *pool; | |
2956 | struct dm_pool_metadata *pmd; | |
e49e5829 | 2957 | bool format_device = read_only ? false : true; |
991d9fa0 | 2958 | |
e49e5829 | 2959 | pmd = dm_pool_metadata_open(metadata_dev, block_size, format_device); |
991d9fa0 JT |
2960 | if (IS_ERR(pmd)) { |
2961 | *error = "Error creating metadata object"; | |
2962 | return (struct pool *)pmd; | |
2963 | } | |
2964 | ||
2965 | pool = kmalloc(sizeof(*pool), GFP_KERNEL); | |
2966 | if (!pool) { | |
2967 | *error = "Error allocating memory for pool"; | |
2968 | err_p = ERR_PTR(-ENOMEM); | |
2969 | goto bad_pool; | |
2970 | } | |
2971 | ||
2972 | pool->pmd = pmd; | |
2973 | pool->sectors_per_block = block_size; | |
f9a8e0cd MP |
2974 | if (block_size & (block_size - 1)) |
2975 | pool->sectors_per_block_shift = -1; | |
2976 | else | |
2977 | pool->sectors_per_block_shift = __ffs(block_size); | |
991d9fa0 | 2978 | pool->low_water_blocks = 0; |
67e2e2b2 | 2979 | pool_features_init(&pool->pf); |
a195db2d | 2980 | pool->prison = dm_bio_prison_create(); |
991d9fa0 JT |
2981 | if (!pool->prison) { |
2982 | *error = "Error creating pool's bio prison"; | |
2983 | err_p = ERR_PTR(-ENOMEM); | |
2984 | goto bad_prison; | |
2985 | } | |
2986 | ||
df5d2e90 | 2987 | pool->copier = dm_kcopyd_client_create(&dm_kcopyd_throttle); |
991d9fa0 JT |
2988 | if (IS_ERR(pool->copier)) { |
2989 | r = PTR_ERR(pool->copier); | |
2990 | *error = "Error creating pool's kcopyd client"; | |
2991 | err_p = ERR_PTR(r); | |
2992 | goto bad_kcopyd_client; | |
2993 | } | |
2994 | ||
2995 | /* | |
2996 | * Create singlethreaded workqueue that will service all devices | |
2997 | * that use this metadata. | |
2998 | */ | |
2999 | pool->wq = alloc_ordered_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM); | |
3000 | if (!pool->wq) { | |
3001 | *error = "Error creating pool's workqueue"; | |
3002 | err_p = ERR_PTR(-ENOMEM); | |
3003 | goto bad_wq; | |
3004 | } | |
3005 | ||
7d327fe0 | 3006 | throttle_init(&pool->throttle); |
991d9fa0 | 3007 | INIT_WORK(&pool->worker, do_worker); |
905e51b3 | 3008 | INIT_DELAYED_WORK(&pool->waker, do_waker); |
85ad643b | 3009 | INIT_DELAYED_WORK(&pool->no_space_timeout, do_no_space_timeout); |
991d9fa0 | 3010 | spin_lock_init(&pool->lock); |
991d9fa0 | 3011 | bio_list_init(&pool->deferred_flush_bios); |
e36827df | 3012 | bio_list_init(&pool->deferred_flush_completions); |
991d9fa0 | 3013 | INIT_LIST_HEAD(&pool->prepared_mappings); |
104655fd | 3014 | INIT_LIST_HEAD(&pool->prepared_discards); |
2a0fbffb | 3015 | INIT_LIST_HEAD(&pool->prepared_discards_pt2); |
c140e1c4 | 3016 | INIT_LIST_HEAD(&pool->active_thins); |
88a6621b | 3017 | pool->low_water_triggered = false; |
80e96c54 | 3018 | pool->suspended = true; |
c3667cc6 | 3019 | pool->out_of_data_space = false; |
44feb387 MS |
3020 | |
3021 | pool->shared_read_ds = dm_deferred_set_create(); | |
3022 | if (!pool->shared_read_ds) { | |
3023 | *error = "Error creating pool's shared read deferred set"; | |
3024 | err_p = ERR_PTR(-ENOMEM); | |
3025 | goto bad_shared_read_ds; | |
3026 | } | |
3027 | ||
3028 | pool->all_io_ds = dm_deferred_set_create(); | |
3029 | if (!pool->all_io_ds) { | |
3030 | *error = "Error creating pool's all io deferred set"; | |
3031 | err_p = ERR_PTR(-ENOMEM); | |
3032 | goto bad_all_io_ds; | |
3033 | } | |
991d9fa0 JT |
3034 | |
3035 | pool->next_mapping = NULL; | |
a24c2569 MS |
3036 | pool->mapping_pool = mempool_create_slab_pool(MAPPING_POOL_SIZE, |
3037 | _new_mapping_cache); | |
991d9fa0 JT |
3038 | if (!pool->mapping_pool) { |
3039 | *error = "Error creating pool's mapping mempool"; | |
3040 | err_p = ERR_PTR(-ENOMEM); | |
3041 | goto bad_mapping_pool; | |
3042 | } | |
3043 | ||
a822c83e JT |
3044 | pool->cell_sort_array = vmalloc(sizeof(*pool->cell_sort_array) * CELL_SORT_ARRAY_SIZE); |
3045 | if (!pool->cell_sort_array) { | |
3046 | *error = "Error allocating cell sort array"; | |
3047 | err_p = ERR_PTR(-ENOMEM); | |
3048 | goto bad_sort_array; | |
3049 | } | |
3050 | ||
991d9fa0 | 3051 | pool->ref_count = 1; |
905e51b3 | 3052 | pool->last_commit_jiffies = jiffies; |
991d9fa0 JT |
3053 | pool->pool_md = pool_md; |
3054 | pool->md_dev = metadata_dev; | |
3055 | __pool_table_insert(pool); | |
3056 | ||
3057 | return pool; | |
3058 | ||
a822c83e JT |
3059 | bad_sort_array: |
3060 | mempool_destroy(pool->mapping_pool); | |
991d9fa0 | 3061 | bad_mapping_pool: |
44feb387 MS |
3062 | dm_deferred_set_destroy(pool->all_io_ds); |
3063 | bad_all_io_ds: | |
3064 | dm_deferred_set_destroy(pool->shared_read_ds); | |
3065 | bad_shared_read_ds: | |
991d9fa0 JT |
3066 | destroy_workqueue(pool->wq); |
3067 | bad_wq: | |
3068 | dm_kcopyd_client_destroy(pool->copier); | |
3069 | bad_kcopyd_client: | |
44feb387 | 3070 | dm_bio_prison_destroy(pool->prison); |
991d9fa0 JT |
3071 | bad_prison: |
3072 | kfree(pool); | |
3073 | bad_pool: | |
3074 | if (dm_pool_metadata_close(pmd)) | |
3075 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); | |
3076 | ||
3077 | return err_p; | |
3078 | } | |
3079 | ||
3080 | static void __pool_inc(struct pool *pool) | |
3081 | { | |
3082 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); | |
3083 | pool->ref_count++; | |
3084 | } | |
3085 | ||
3086 | static void __pool_dec(struct pool *pool) | |
3087 | { | |
3088 | BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex)); | |
3089 | BUG_ON(!pool->ref_count); | |
3090 | if (!--pool->ref_count) | |
3091 | __pool_destroy(pool); | |
3092 | } | |
3093 | ||
3094 | static struct pool *__pool_find(struct mapped_device *pool_md, | |
3095 | struct block_device *metadata_dev, | |
e49e5829 JT |
3096 | unsigned long block_size, int read_only, |
3097 | char **error, int *created) | |
991d9fa0 JT |
3098 | { |
3099 | struct pool *pool = __pool_table_lookup_metadata_dev(metadata_dev); | |
3100 | ||
3101 | if (pool) { | |
f09996c9 MS |
3102 | if (pool->pool_md != pool_md) { |
3103 | *error = "metadata device already in use by a pool"; | |
991d9fa0 | 3104 | return ERR_PTR(-EBUSY); |
f09996c9 | 3105 | } |
991d9fa0 JT |
3106 | __pool_inc(pool); |
3107 | ||
3108 | } else { | |
3109 | pool = __pool_table_lookup(pool_md); | |
3110 | if (pool) { | |
f09996c9 MS |
3111 | if (pool->md_dev != metadata_dev) { |
3112 | *error = "different pool cannot replace a pool"; | |
991d9fa0 | 3113 | return ERR_PTR(-EINVAL); |
f09996c9 | 3114 | } |
991d9fa0 JT |
3115 | __pool_inc(pool); |
3116 | ||
67e2e2b2 | 3117 | } else { |
e49e5829 | 3118 | pool = pool_create(pool_md, metadata_dev, block_size, read_only, error); |
67e2e2b2 JT |
3119 | *created = 1; |
3120 | } | |
991d9fa0 JT |
3121 | } |
3122 | ||
3123 | return pool; | |
3124 | } | |
3125 | ||
3126 | /*---------------------------------------------------------------- | |
3127 | * Pool target methods | |
3128 | *--------------------------------------------------------------*/ | |
3129 | static void pool_dtr(struct dm_target *ti) | |
3130 | { | |
3131 | struct pool_c *pt = ti->private; | |
3132 | ||
3133 | mutex_lock(&dm_thin_pool_table.mutex); | |
3134 | ||
3135 | unbind_control_target(pt->pool, ti); | |
3136 | __pool_dec(pt->pool); | |
3137 | dm_put_device(ti, pt->metadata_dev); | |
3138 | dm_put_device(ti, pt->data_dev); | |
3139 | kfree(pt); | |
3140 | ||
3141 | mutex_unlock(&dm_thin_pool_table.mutex); | |
3142 | } | |
3143 | ||
991d9fa0 JT |
3144 | static int parse_pool_features(struct dm_arg_set *as, struct pool_features *pf, |
3145 | struct dm_target *ti) | |
3146 | { | |
3147 | int r; | |
3148 | unsigned argc; | |
3149 | const char *arg_name; | |
3150 | ||
5916a22b | 3151 | static const struct dm_arg _args[] = { |
74aa45c3 | 3152 | {0, 4, "Invalid number of pool feature arguments"}, |
991d9fa0 JT |
3153 | }; |
3154 | ||
3155 | /* | |
3156 | * No feature arguments supplied. | |
3157 | */ | |
3158 | if (!as->argc) | |
3159 | return 0; | |
3160 | ||
3161 | r = dm_read_arg_group(_args, as, &argc, &ti->error); | |
3162 | if (r) | |
3163 | return -EINVAL; | |
3164 | ||
3165 | while (argc && !r) { | |
3166 | arg_name = dm_shift_arg(as); | |
3167 | argc--; | |
3168 | ||
e49e5829 | 3169 | if (!strcasecmp(arg_name, "skip_block_zeroing")) |
9bc142dd | 3170 | pf->zero_new_blocks = false; |
e49e5829 JT |
3171 | |
3172 | else if (!strcasecmp(arg_name, "ignore_discard")) | |
9bc142dd | 3173 | pf->discard_enabled = false; |
e49e5829 JT |
3174 | |
3175 | else if (!strcasecmp(arg_name, "no_discard_passdown")) | |
9bc142dd | 3176 | pf->discard_passdown = false; |
991d9fa0 | 3177 | |
e49e5829 JT |
3178 | else if (!strcasecmp(arg_name, "read_only")) |
3179 | pf->mode = PM_READ_ONLY; | |
3180 | ||
787a996c MS |
3181 | else if (!strcasecmp(arg_name, "error_if_no_space")) |
3182 | pf->error_if_no_space = true; | |
3183 | ||
e49e5829 JT |
3184 | else { |
3185 | ti->error = "Unrecognised pool feature requested"; | |
3186 | r = -EINVAL; | |
3187 | break; | |
3188 | } | |
991d9fa0 JT |
3189 | } |
3190 | ||
3191 | return r; | |
3192 | } | |
3193 | ||
ac8c3f3d JT |
3194 | static void metadata_low_callback(void *context) |
3195 | { | |
3196 | struct pool *pool = context; | |
3197 | ||
3198 | DMWARN("%s: reached low water mark for metadata device: sending event.", | |
3199 | dm_device_name(pool->pool_md)); | |
3200 | ||
3201 | dm_table_event(pool->ti->table); | |
3202 | } | |
3203 | ||
7d48935e MS |
3204 | static sector_t get_dev_size(struct block_device *bdev) |
3205 | { | |
3206 | return i_size_read(bdev->bd_inode) >> SECTOR_SHIFT; | |
3207 | } | |
3208 | ||
3209 | static void warn_if_metadata_device_too_big(struct block_device *bdev) | |
b17446df | 3210 | { |
7d48935e | 3211 | sector_t metadata_dev_size = get_dev_size(bdev); |
b17446df JT |
3212 | char buffer[BDEVNAME_SIZE]; |
3213 | ||
7d48935e | 3214 | if (metadata_dev_size > THIN_METADATA_MAX_SECTORS_WARNING) |
b17446df JT |
3215 | DMWARN("Metadata device %s is larger than %u sectors: excess space will not be used.", |
3216 | bdevname(bdev, buffer), THIN_METADATA_MAX_SECTORS); | |
7d48935e MS |
3217 | } |
3218 | ||
3219 | static sector_t get_metadata_dev_size(struct block_device *bdev) | |
3220 | { | |
3221 | sector_t metadata_dev_size = get_dev_size(bdev); | |
3222 | ||
3223 | if (metadata_dev_size > THIN_METADATA_MAX_SECTORS) | |
3224 | metadata_dev_size = THIN_METADATA_MAX_SECTORS; | |
b17446df JT |
3225 | |
3226 | return metadata_dev_size; | |
3227 | } | |
3228 | ||
24347e95 JT |
3229 | static dm_block_t get_metadata_dev_size_in_blocks(struct block_device *bdev) |
3230 | { | |
3231 | sector_t metadata_dev_size = get_metadata_dev_size(bdev); | |
3232 | ||
7d48935e | 3233 | sector_div(metadata_dev_size, THIN_METADATA_BLOCK_SIZE); |
24347e95 JT |
3234 | |
3235 | return metadata_dev_size; | |
3236 | } | |
3237 | ||
ac8c3f3d JT |
3238 | /* |
3239 | * When a metadata threshold is crossed a dm event is triggered, and | |
3240 | * userland should respond by growing the metadata device. We could let | |
3241 | * userland set the threshold, like we do with the data threshold, but I'm | |
3242 | * not sure they know enough to do this well. | |
3243 | */ | |
3244 | static dm_block_t calc_metadata_threshold(struct pool_c *pt) | |
3245 | { | |
3246 | /* | |
3247 | * 4M is ample for all ops with the possible exception of thin | |
3248 | * device deletion which is harmless if it fails (just retry the | |
3249 | * delete after you've grown the device). | |
3250 | */ | |
3251 | dm_block_t quarter = get_metadata_dev_size_in_blocks(pt->metadata_dev->bdev) / 4; | |
3252 | return min((dm_block_t)1024ULL /* 4M */, quarter); | |
3253 | } | |
3254 | ||
991d9fa0 JT |
3255 | /* |
3256 | * thin-pool <metadata dev> <data dev> | |
3257 | * <data block size (sectors)> | |
3258 | * <low water mark (blocks)> | |
3259 | * [<#feature args> [<arg>]*] | |
3260 | * | |
3261 | * Optional feature arguments are: | |
3262 | * skip_block_zeroing: skips the zeroing of newly-provisioned blocks. | |
67e2e2b2 JT |
3263 | * ignore_discard: disable discard |
3264 | * no_discard_passdown: don't pass discards down to the data device | |
787a996c MS |
3265 | * read_only: Don't allow any changes to be made to the pool metadata. |
3266 | * error_if_no_space: error IOs, instead of queueing, if no space. | |
991d9fa0 JT |
3267 | */ |
3268 | static int pool_ctr(struct dm_target *ti, unsigned argc, char **argv) | |
3269 | { | |
67e2e2b2 | 3270 | int r, pool_created = 0; |
991d9fa0 JT |
3271 | struct pool_c *pt; |
3272 | struct pool *pool; | |
3273 | struct pool_features pf; | |
3274 | struct dm_arg_set as; | |
3275 | struct dm_dev *data_dev; | |
3276 | unsigned long block_size; | |
3277 | dm_block_t low_water_blocks; | |
3278 | struct dm_dev *metadata_dev; | |
5d0db96d | 3279 | fmode_t metadata_mode; |
991d9fa0 JT |
3280 | |
3281 | /* | |
3282 | * FIXME Remove validation from scope of lock. | |
3283 | */ | |
3284 | mutex_lock(&dm_thin_pool_table.mutex); | |
3285 | ||
3286 | if (argc < 4) { | |
3287 | ti->error = "Invalid argument count"; | |
3288 | r = -EINVAL; | |
3289 | goto out_unlock; | |
3290 | } | |
5d0db96d | 3291 | |
991d9fa0 JT |
3292 | as.argc = argc; |
3293 | as.argv = argv; | |
3294 | ||
a927950a JCXF |
3295 | /* make sure metadata and data are different devices */ |
3296 | if (!strcmp(argv[0], argv[1])) { | |
3297 | ti->error = "Error setting metadata or data device"; | |
3298 | r = -EINVAL; | |
3299 | goto out_unlock; | |
3300 | } | |
3301 | ||
5d0db96d JT |
3302 | /* |
3303 | * Set default pool features. | |
3304 | */ | |
3305 | pool_features_init(&pf); | |
3306 | ||
3307 | dm_consume_args(&as, 4); | |
3308 | r = parse_pool_features(&as, &pf, ti); | |
3309 | if (r) | |
3310 | goto out_unlock; | |
3311 | ||
3312 | metadata_mode = FMODE_READ | ((pf.mode == PM_READ_ONLY) ? 0 : FMODE_WRITE); | |
3313 | r = dm_get_device(ti, argv[0], metadata_mode, &metadata_dev); | |
991d9fa0 JT |
3314 | if (r) { |
3315 | ti->error = "Error opening metadata block device"; | |
3316 | goto out_unlock; | |
3317 | } | |
7d48935e | 3318 | warn_if_metadata_device_too_big(metadata_dev->bdev); |
991d9fa0 JT |
3319 | |
3320 | r = dm_get_device(ti, argv[1], FMODE_READ | FMODE_WRITE, &data_dev); | |
3321 | if (r) { | |
3322 | ti->error = "Error getting data device"; | |
3323 | goto out_metadata; | |
3324 | } | |
3325 | ||
3326 | if (kstrtoul(argv[2], 10, &block_size) || !block_size || | |
3327 | block_size < DATA_DEV_BLOCK_SIZE_MIN_SECTORS || | |
3328 | block_size > DATA_DEV_BLOCK_SIZE_MAX_SECTORS || | |
55f2b8bd | 3329 | block_size & (DATA_DEV_BLOCK_SIZE_MIN_SECTORS - 1)) { |
991d9fa0 JT |
3330 | ti->error = "Invalid block size"; |
3331 | r = -EINVAL; | |
3332 | goto out; | |
3333 | } | |
3334 | ||
3335 | if (kstrtoull(argv[3], 10, (unsigned long long *)&low_water_blocks)) { | |
3336 | ti->error = "Invalid low water mark"; | |
3337 | r = -EINVAL; | |
3338 | goto out; | |
3339 | } | |
3340 | ||
991d9fa0 JT |
3341 | pt = kzalloc(sizeof(*pt), GFP_KERNEL); |
3342 | if (!pt) { | |
3343 | r = -ENOMEM; | |
3344 | goto out; | |
3345 | } | |
3346 | ||
3347 | pool = __pool_find(dm_table_get_md(ti->table), metadata_dev->bdev, | |
e49e5829 | 3348 | block_size, pf.mode == PM_READ_ONLY, &ti->error, &pool_created); |
991d9fa0 JT |
3349 | if (IS_ERR(pool)) { |
3350 | r = PTR_ERR(pool); | |
3351 | goto out_free_pt; | |
3352 | } | |
3353 | ||
67e2e2b2 JT |
3354 | /* |
3355 | * 'pool_created' reflects whether this is the first table load. | |
3356 | * Top level discard support is not allowed to be changed after | |
3357 | * initial load. This would require a pool reload to trigger thin | |
3358 | * device changes. | |
3359 | */ | |
3360 | if (!pool_created && pf.discard_enabled != pool->pf.discard_enabled) { | |
3361 | ti->error = "Discard support cannot be disabled once enabled"; | |
3362 | r = -EINVAL; | |
3363 | goto out_flags_changed; | |
3364 | } | |
3365 | ||
991d9fa0 JT |
3366 | pt->pool = pool; |
3367 | pt->ti = ti; | |
3368 | pt->metadata_dev = metadata_dev; | |
3369 | pt->data_dev = data_dev; | |
3370 | pt->low_water_blocks = low_water_blocks; | |
0424caa1 | 3371 | pt->adjusted_pf = pt->requested_pf = pf; |
55a62eef | 3372 | ti->num_flush_bios = 1; |
9bc142dd | 3373 | |
67e2e2b2 JT |
3374 | /* |
3375 | * Only need to enable discards if the pool should pass | |
3376 | * them down to the data device. The thin device's discard | |
3377 | * processing will cause mappings to be removed from the btree. | |
3378 | */ | |
3379 | if (pf.discard_enabled && pf.discard_passdown) { | |
55a62eef | 3380 | ti->num_discard_bios = 1; |
9bc142dd | 3381 | |
67e2e2b2 JT |
3382 | /* |
3383 | * Setting 'discards_supported' circumvents the normal | |
3384 | * stacking of discard limits (this keeps the pool and | |
3385 | * thin devices' discard limits consistent). | |
3386 | */ | |
0ac55489 | 3387 | ti->discards_supported = true; |
67e2e2b2 | 3388 | } |
991d9fa0 JT |
3389 | ti->private = pt; |
3390 | ||
ac8c3f3d JT |
3391 | r = dm_pool_register_metadata_threshold(pt->pool->pmd, |
3392 | calc_metadata_threshold(pt), | |
3393 | metadata_low_callback, | |
3394 | pool); | |
3395 | if (r) | |
ba30670f | 3396 | goto out_flags_changed; |
ac8c3f3d | 3397 | |
991d9fa0 JT |
3398 | pt->callbacks.congested_fn = pool_is_congested; |
3399 | dm_table_add_target_callbacks(ti->table, &pt->callbacks); | |
3400 | ||
3401 | mutex_unlock(&dm_thin_pool_table.mutex); | |
3402 | ||
3403 | return 0; | |
3404 | ||
67e2e2b2 JT |
3405 | out_flags_changed: |
3406 | __pool_dec(pool); | |
991d9fa0 JT |
3407 | out_free_pt: |
3408 | kfree(pt); | |
3409 | out: | |
3410 | dm_put_device(ti, data_dev); | |
3411 | out_metadata: | |
3412 | dm_put_device(ti, metadata_dev); | |
3413 | out_unlock: | |
3414 | mutex_unlock(&dm_thin_pool_table.mutex); | |
3415 | ||
3416 | return r; | |
3417 | } | |
3418 | ||
7de3ee57 | 3419 | static int pool_map(struct dm_target *ti, struct bio *bio) |
991d9fa0 JT |
3420 | { |
3421 | int r; | |
3422 | struct pool_c *pt = ti->private; | |
3423 | struct pool *pool = pt->pool; | |
3424 | unsigned long flags; | |
3425 | ||
3426 | /* | |
3427 | * As this is a singleton target, ti->begin is always zero. | |
3428 | */ | |
3429 | spin_lock_irqsave(&pool->lock, flags); | |
74d46992 | 3430 | bio_set_dev(bio, pt->data_dev->bdev); |
991d9fa0 JT |
3431 | r = DM_MAPIO_REMAPPED; |
3432 | spin_unlock_irqrestore(&pool->lock, flags); | |
3433 | ||
3434 | return r; | |
3435 | } | |
3436 | ||
b17446df | 3437 | static int maybe_resize_data_dev(struct dm_target *ti, bool *need_commit) |
991d9fa0 JT |
3438 | { |
3439 | int r; | |
3440 | struct pool_c *pt = ti->private; | |
3441 | struct pool *pool = pt->pool; | |
55f2b8bd MS |
3442 | sector_t data_size = ti->len; |
3443 | dm_block_t sb_data_size; | |
991d9fa0 | 3444 | |
b17446df | 3445 | *need_commit = false; |
991d9fa0 | 3446 | |
55f2b8bd MS |
3447 | (void) sector_div(data_size, pool->sectors_per_block); |
3448 | ||
991d9fa0 JT |
3449 | r = dm_pool_get_data_dev_size(pool->pmd, &sb_data_size); |
3450 | if (r) { | |
4fa5971a MS |
3451 | DMERR("%s: failed to retrieve data device size", |
3452 | dm_device_name(pool->pool_md)); | |
991d9fa0 JT |
3453 | return r; |
3454 | } | |
3455 | ||
3456 | if (data_size < sb_data_size) { | |
4fa5971a MS |
3457 | DMERR("%s: pool target (%llu blocks) too small: expected %llu", |
3458 | dm_device_name(pool->pool_md), | |
55f2b8bd | 3459 | (unsigned long long)data_size, sb_data_size); |
991d9fa0 JT |
3460 | return -EINVAL; |
3461 | ||
3462 | } else if (data_size > sb_data_size) { | |
07f2b6e0 MS |
3463 | if (dm_pool_metadata_needs_check(pool->pmd)) { |
3464 | DMERR("%s: unable to grow the data device until repaired.", | |
3465 | dm_device_name(pool->pool_md)); | |
3466 | return 0; | |
3467 | } | |
3468 | ||
6f7f51d4 MS |
3469 | if (sb_data_size) |
3470 | DMINFO("%s: growing the data device from %llu to %llu blocks", | |
3471 | dm_device_name(pool->pool_md), | |
3472 | sb_data_size, (unsigned long long)data_size); | |
991d9fa0 JT |
3473 | r = dm_pool_resize_data_dev(pool->pmd, data_size); |
3474 | if (r) { | |
b5330655 | 3475 | metadata_operation_failed(pool, "dm_pool_resize_data_dev", r); |
991d9fa0 JT |
3476 | return r; |
3477 | } | |
3478 | ||
b17446df | 3479 | *need_commit = true; |
991d9fa0 JT |
3480 | } |
3481 | ||
3482 | return 0; | |
3483 | } | |
3484 | ||
24347e95 JT |
3485 | static int maybe_resize_metadata_dev(struct dm_target *ti, bool *need_commit) |
3486 | { | |
3487 | int r; | |
3488 | struct pool_c *pt = ti->private; | |
3489 | struct pool *pool = pt->pool; | |
3490 | dm_block_t metadata_dev_size, sb_metadata_dev_size; | |
3491 | ||
3492 | *need_commit = false; | |
3493 | ||
610bba8b | 3494 | metadata_dev_size = get_metadata_dev_size_in_blocks(pool->md_dev); |
24347e95 JT |
3495 | |
3496 | r = dm_pool_get_metadata_dev_size(pool->pmd, &sb_metadata_dev_size); | |
3497 | if (r) { | |
4fa5971a MS |
3498 | DMERR("%s: failed to retrieve metadata device size", |
3499 | dm_device_name(pool->pool_md)); | |
24347e95 JT |
3500 | return r; |
3501 | } | |
3502 | ||
3503 | if (metadata_dev_size < sb_metadata_dev_size) { | |
4fa5971a MS |
3504 | DMERR("%s: metadata device (%llu blocks) too small: expected %llu", |
3505 | dm_device_name(pool->pool_md), | |
24347e95 JT |
3506 | metadata_dev_size, sb_metadata_dev_size); |
3507 | return -EINVAL; | |
3508 | ||
3509 | } else if (metadata_dev_size > sb_metadata_dev_size) { | |
07f2b6e0 MS |
3510 | if (dm_pool_metadata_needs_check(pool->pmd)) { |
3511 | DMERR("%s: unable to grow the metadata device until repaired.", | |
3512 | dm_device_name(pool->pool_md)); | |
3513 | return 0; | |
3514 | } | |
3515 | ||
7d48935e | 3516 | warn_if_metadata_device_too_big(pool->md_dev); |
6f7f51d4 MS |
3517 | DMINFO("%s: growing the metadata device from %llu to %llu blocks", |
3518 | dm_device_name(pool->pool_md), | |
3519 | sb_metadata_dev_size, metadata_dev_size); | |
7e420796 JT |
3520 | |
3521 | if (get_pool_mode(pool) == PM_OUT_OF_METADATA_SPACE) | |
3522 | set_pool_mode(pool, PM_WRITE); | |
3523 | ||
24347e95 JT |
3524 | r = dm_pool_resize_metadata_dev(pool->pmd, metadata_dev_size); |
3525 | if (r) { | |
b5330655 | 3526 | metadata_operation_failed(pool, "dm_pool_resize_metadata_dev", r); |
24347e95 JT |
3527 | return r; |
3528 | } | |
3529 | ||
3530 | *need_commit = true; | |
3531 | } | |
3532 | ||
3533 | return 0; | |
3534 | } | |
3535 | ||
b17446df JT |
3536 | /* |
3537 | * Retrieves the number of blocks of the data device from | |
3538 | * the superblock and compares it to the actual device size, | |
3539 | * thus resizing the data device in case it has grown. | |
3540 | * | |
3541 | * This both copes with opening preallocated data devices in the ctr | |
3542 | * being followed by a resume | |
3543 | * -and- | |
3544 | * calling the resume method individually after userspace has | |
3545 | * grown the data device in reaction to a table event. | |
3546 | */ | |
3547 | static int pool_preresume(struct dm_target *ti) | |
3548 | { | |
3549 | int r; | |
24347e95 | 3550 | bool need_commit1, need_commit2; |
b17446df JT |
3551 | struct pool_c *pt = ti->private; |
3552 | struct pool *pool = pt->pool; | |
3553 | ||
3554 | /* | |
3555 | * Take control of the pool object. | |
3556 | */ | |
3557 | r = bind_control_target(pool, ti); | |
3558 | if (r) | |
3559 | return r; | |
3560 | ||
3561 | r = maybe_resize_data_dev(ti, &need_commit1); | |
3562 | if (r) | |
3563 | return r; | |
3564 | ||
24347e95 JT |
3565 | r = maybe_resize_metadata_dev(ti, &need_commit2); |
3566 | if (r) | |
3567 | return r; | |
3568 | ||
3569 | if (need_commit1 || need_commit2) | |
020cc3b5 | 3570 | (void) commit(pool); |
b17446df JT |
3571 | |
3572 | return 0; | |
3573 | } | |
3574 | ||
583024d2 MS |
3575 | static void pool_suspend_active_thins(struct pool *pool) |
3576 | { | |
3577 | struct thin_c *tc; | |
3578 | ||
3579 | /* Suspend all active thin devices */ | |
3580 | tc = get_first_thin(pool); | |
3581 | while (tc) { | |
3582 | dm_internal_suspend_noflush(tc->thin_md); | |
3583 | tc = get_next_thin(pool, tc); | |
3584 | } | |
3585 | } | |
3586 | ||
3587 | static void pool_resume_active_thins(struct pool *pool) | |
3588 | { | |
3589 | struct thin_c *tc; | |
3590 | ||
3591 | /* Resume all active thin devices */ | |
3592 | tc = get_first_thin(pool); | |
3593 | while (tc) { | |
3594 | dm_internal_resume(tc->thin_md); | |
3595 | tc = get_next_thin(pool, tc); | |
3596 | } | |
3597 | } | |
3598 | ||
991d9fa0 JT |
3599 | static void pool_resume(struct dm_target *ti) |
3600 | { | |
3601 | struct pool_c *pt = ti->private; | |
3602 | struct pool *pool = pt->pool; | |
3603 | unsigned long flags; | |
3604 | ||
583024d2 MS |
3605 | /* |
3606 | * Must requeue active_thins' bios and then resume | |
3607 | * active_thins _before_ clearing 'suspend' flag. | |
3608 | */ | |
3609 | requeue_bios(pool); | |
3610 | pool_resume_active_thins(pool); | |
3611 | ||
991d9fa0 | 3612 | spin_lock_irqsave(&pool->lock, flags); |
88a6621b | 3613 | pool->low_water_triggered = false; |
80e96c54 | 3614 | pool->suspended = false; |
991d9fa0 | 3615 | spin_unlock_irqrestore(&pool->lock, flags); |
80e96c54 | 3616 | |
905e51b3 | 3617 | do_waker(&pool->waker.work); |
991d9fa0 JT |
3618 | } |
3619 | ||
80e96c54 MS |
3620 | static void pool_presuspend(struct dm_target *ti) |
3621 | { | |
3622 | struct pool_c *pt = ti->private; | |
3623 | struct pool *pool = pt->pool; | |
3624 | unsigned long flags; | |
3625 | ||
3626 | spin_lock_irqsave(&pool->lock, flags); | |
3627 | pool->suspended = true; | |
3628 | spin_unlock_irqrestore(&pool->lock, flags); | |
583024d2 MS |
3629 | |
3630 | pool_suspend_active_thins(pool); | |
80e96c54 MS |
3631 | } |
3632 | ||
3633 | static void pool_presuspend_undo(struct dm_target *ti) | |
3634 | { | |
3635 | struct pool_c *pt = ti->private; | |
3636 | struct pool *pool = pt->pool; | |
3637 | unsigned long flags; | |
3638 | ||
583024d2 MS |
3639 | pool_resume_active_thins(pool); |
3640 | ||
80e96c54 MS |
3641 | spin_lock_irqsave(&pool->lock, flags); |
3642 | pool->suspended = false; | |
3643 | spin_unlock_irqrestore(&pool->lock, flags); | |
3644 | } | |
3645 | ||
991d9fa0 JT |
3646 | static void pool_postsuspend(struct dm_target *ti) |
3647 | { | |
991d9fa0 JT |
3648 | struct pool_c *pt = ti->private; |
3649 | struct pool *pool = pt->pool; | |
3650 | ||
18d03e8c NB |
3651 | cancel_delayed_work_sync(&pool->waker); |
3652 | cancel_delayed_work_sync(&pool->no_space_timeout); | |
991d9fa0 | 3653 | flush_workqueue(pool->wq); |
020cc3b5 | 3654 | (void) commit(pool); |
991d9fa0 JT |
3655 | } |
3656 | ||
3657 | static int check_arg_count(unsigned argc, unsigned args_required) | |
3658 | { | |
3659 | if (argc != args_required) { | |
3660 | DMWARN("Message received with %u arguments instead of %u.", | |
3661 | argc, args_required); | |
3662 | return -EINVAL; | |
3663 | } | |
3664 | ||
3665 | return 0; | |
3666 | } | |
3667 | ||
3668 | static int read_dev_id(char *arg, dm_thin_id *dev_id, int warning) | |
3669 | { | |
3670 | if (!kstrtoull(arg, 10, (unsigned long long *)dev_id) && | |
3671 | *dev_id <= MAX_DEV_ID) | |
3672 | return 0; | |
3673 | ||
3674 | if (warning) | |
3675 | DMWARN("Message received with invalid device id: %s", arg); | |
3676 | ||
3677 | return -EINVAL; | |
3678 | } | |
3679 | ||
3680 | static int process_create_thin_mesg(unsigned argc, char **argv, struct pool *pool) | |
3681 | { | |
3682 | dm_thin_id dev_id; | |
3683 | int r; | |
3684 | ||
3685 | r = check_arg_count(argc, 2); | |
3686 | if (r) | |
3687 | return r; | |
3688 | ||
3689 | r = read_dev_id(argv[1], &dev_id, 1); | |
3690 | if (r) | |
3691 | return r; | |
3692 | ||
3693 | r = dm_pool_create_thin(pool->pmd, dev_id); | |
3694 | if (r) { | |
3695 | DMWARN("Creation of new thinly-provisioned device with id %s failed.", | |
3696 | argv[1]); | |
3697 | return r; | |
3698 | } | |
3699 | ||
3700 | return 0; | |
3701 | } | |
3702 | ||
3703 | static int process_create_snap_mesg(unsigned argc, char **argv, struct pool *pool) | |
3704 | { | |
3705 | dm_thin_id dev_id; | |
3706 | dm_thin_id origin_dev_id; | |
3707 | int r; | |
3708 | ||
3709 | r = check_arg_count(argc, 3); | |
3710 | if (r) | |
3711 | return r; | |
3712 | ||
3713 | r = read_dev_id(argv[1], &dev_id, 1); | |
3714 | if (r) | |
3715 | return r; | |
3716 | ||
3717 | r = read_dev_id(argv[2], &origin_dev_id, 1); | |
3718 | if (r) | |
3719 | return r; | |
3720 | ||
3721 | r = dm_pool_create_snap(pool->pmd, dev_id, origin_dev_id); | |
3722 | if (r) { | |
3723 | DMWARN("Creation of new snapshot %s of device %s failed.", | |
3724 | argv[1], argv[2]); | |
3725 | return r; | |
3726 | } | |
3727 | ||
3728 | return 0; | |
3729 | } | |
3730 | ||
3731 | static int process_delete_mesg(unsigned argc, char **argv, struct pool *pool) | |
3732 | { | |
3733 | dm_thin_id dev_id; | |
3734 | int r; | |
3735 | ||
3736 | r = check_arg_count(argc, 2); | |
3737 | if (r) | |
3738 | return r; | |
3739 | ||
3740 | r = read_dev_id(argv[1], &dev_id, 1); | |
3741 | if (r) | |
3742 | return r; | |
3743 | ||
3744 | r = dm_pool_delete_thin_device(pool->pmd, dev_id); | |
3745 | if (r) | |
3746 | DMWARN("Deletion of thin device %s failed.", argv[1]); | |
3747 | ||
3748 | return r; | |
3749 | } | |
3750 | ||
3751 | static int process_set_transaction_id_mesg(unsigned argc, char **argv, struct pool *pool) | |
3752 | { | |
3753 | dm_thin_id old_id, new_id; | |
3754 | int r; | |
3755 | ||
3756 | r = check_arg_count(argc, 3); | |
3757 | if (r) | |
3758 | return r; | |
3759 | ||
3760 | if (kstrtoull(argv[1], 10, (unsigned long long *)&old_id)) { | |
3761 | DMWARN("set_transaction_id message: Unrecognised id %s.", argv[1]); | |
3762 | return -EINVAL; | |
3763 | } | |
3764 | ||
3765 | if (kstrtoull(argv[2], 10, (unsigned long long *)&new_id)) { | |
3766 | DMWARN("set_transaction_id message: Unrecognised new id %s.", argv[2]); | |
3767 | return -EINVAL; | |
3768 | } | |
3769 | ||
3770 | r = dm_pool_set_metadata_transaction_id(pool->pmd, old_id, new_id); | |
3771 | if (r) { | |
3772 | DMWARN("Failed to change transaction id from %s to %s.", | |
3773 | argv[1], argv[2]); | |
3774 | return r; | |
3775 | } | |
3776 | ||
3777 | return 0; | |
3778 | } | |
3779 | ||
cc8394d8 JT |
3780 | static int process_reserve_metadata_snap_mesg(unsigned argc, char **argv, struct pool *pool) |
3781 | { | |
3782 | int r; | |
3783 | ||
3784 | r = check_arg_count(argc, 1); | |
3785 | if (r) | |
3786 | return r; | |
3787 | ||
020cc3b5 | 3788 | (void) commit(pool); |
0d200aef | 3789 | |
cc8394d8 JT |
3790 | r = dm_pool_reserve_metadata_snap(pool->pmd); |
3791 | if (r) | |
3792 | DMWARN("reserve_metadata_snap message failed."); | |
3793 | ||
3794 | return r; | |
3795 | } | |
3796 | ||
3797 | static int process_release_metadata_snap_mesg(unsigned argc, char **argv, struct pool *pool) | |
3798 | { | |
3799 | int r; | |
3800 | ||
3801 | r = check_arg_count(argc, 1); | |
3802 | if (r) | |
3803 | return r; | |
3804 | ||
3805 | r = dm_pool_release_metadata_snap(pool->pmd); | |
3806 | if (r) | |
3807 | DMWARN("release_metadata_snap message failed."); | |
3808 | ||
3809 | return r; | |
3810 | } | |
3811 | ||
991d9fa0 JT |
3812 | /* |
3813 | * Messages supported: | |
3814 | * create_thin <dev_id> | |
3815 | * create_snap <dev_id> <origin_id> | |
3816 | * delete <dev_id> | |
991d9fa0 | 3817 | * set_transaction_id <current_trans_id> <new_trans_id> |
cc8394d8 JT |
3818 | * reserve_metadata_snap |
3819 | * release_metadata_snap | |
991d9fa0 JT |
3820 | */ |
3821 | static int pool_message(struct dm_target *ti, unsigned argc, char **argv) | |
3822 | { | |
3823 | int r = -EINVAL; | |
3824 | struct pool_c *pt = ti->private; | |
3825 | struct pool *pool = pt->pool; | |
3826 | ||
7e420796 | 3827 | if (get_pool_mode(pool) >= PM_OUT_OF_METADATA_SPACE) { |
2a7eaea0 JT |
3828 | DMERR("%s: unable to service pool target messages in READ_ONLY or FAIL mode", |
3829 | dm_device_name(pool->pool_md)); | |
fd467696 | 3830 | return -EOPNOTSUPP; |
2a7eaea0 JT |
3831 | } |
3832 | ||
991d9fa0 JT |
3833 | if (!strcasecmp(argv[0], "create_thin")) |
3834 | r = process_create_thin_mesg(argc, argv, pool); | |
3835 | ||
3836 | else if (!strcasecmp(argv[0], "create_snap")) | |
3837 | r = process_create_snap_mesg(argc, argv, pool); | |
3838 | ||
3839 | else if (!strcasecmp(argv[0], "delete")) | |
3840 | r = process_delete_mesg(argc, argv, pool); | |
3841 | ||
3842 | else if (!strcasecmp(argv[0], "set_transaction_id")) | |
3843 | r = process_set_transaction_id_mesg(argc, argv, pool); | |
3844 | ||
cc8394d8 JT |
3845 | else if (!strcasecmp(argv[0], "reserve_metadata_snap")) |
3846 | r = process_reserve_metadata_snap_mesg(argc, argv, pool); | |
3847 | ||
3848 | else if (!strcasecmp(argv[0], "release_metadata_snap")) | |
3849 | r = process_release_metadata_snap_mesg(argc, argv, pool); | |
3850 | ||
991d9fa0 JT |
3851 | else |
3852 | DMWARN("Unrecognised thin pool target message received: %s", argv[0]); | |
3853 | ||
e49e5829 | 3854 | if (!r) |
020cc3b5 | 3855 | (void) commit(pool); |
991d9fa0 JT |
3856 | |
3857 | return r; | |
3858 | } | |
3859 | ||
e49e5829 JT |
3860 | static void emit_flags(struct pool_features *pf, char *result, |
3861 | unsigned sz, unsigned maxlen) | |
3862 | { | |
3863 | unsigned count = !pf->zero_new_blocks + !pf->discard_enabled + | |
787a996c MS |
3864 | !pf->discard_passdown + (pf->mode == PM_READ_ONLY) + |
3865 | pf->error_if_no_space; | |
e49e5829 JT |
3866 | DMEMIT("%u ", count); |
3867 | ||
3868 | if (!pf->zero_new_blocks) | |
3869 | DMEMIT("skip_block_zeroing "); | |
3870 | ||
3871 | if (!pf->discard_enabled) | |
3872 | DMEMIT("ignore_discard "); | |
3873 | ||
3874 | if (!pf->discard_passdown) | |
3875 | DMEMIT("no_discard_passdown "); | |
3876 | ||
3877 | if (pf->mode == PM_READ_ONLY) | |
3878 | DMEMIT("read_only "); | |
787a996c MS |
3879 | |
3880 | if (pf->error_if_no_space) | |
3881 | DMEMIT("error_if_no_space "); | |
e49e5829 JT |
3882 | } |
3883 | ||
991d9fa0 JT |
3884 | /* |
3885 | * Status line is: | |
3886 | * <transaction id> <used metadata sectors>/<total metadata sectors> | |
3887 | * <used data sectors>/<total data sectors> <held metadata root> | |
e4c78e21 | 3888 | * <pool mode> <discard config> <no space config> <needs_check> |
991d9fa0 | 3889 | */ |
fd7c092e MP |
3890 | static void pool_status(struct dm_target *ti, status_type_t type, |
3891 | unsigned status_flags, char *result, unsigned maxlen) | |
991d9fa0 | 3892 | { |
e49e5829 | 3893 | int r; |
991d9fa0 JT |
3894 | unsigned sz = 0; |
3895 | uint64_t transaction_id; | |
3896 | dm_block_t nr_free_blocks_data; | |
3897 | dm_block_t nr_free_blocks_metadata; | |
3898 | dm_block_t nr_blocks_data; | |
3899 | dm_block_t nr_blocks_metadata; | |
3900 | dm_block_t held_root; | |
7e420796 | 3901 | enum pool_mode mode; |
991d9fa0 JT |
3902 | char buf[BDEVNAME_SIZE]; |
3903 | char buf2[BDEVNAME_SIZE]; | |
3904 | struct pool_c *pt = ti->private; | |
3905 | struct pool *pool = pt->pool; | |
3906 | ||
3907 | switch (type) { | |
3908 | case STATUSTYPE_INFO: | |
e49e5829 JT |
3909 | if (get_pool_mode(pool) == PM_FAIL) { |
3910 | DMEMIT("Fail"); | |
3911 | break; | |
3912 | } | |
3913 | ||
1f4e0ff0 AK |
3914 | /* Commit to ensure statistics aren't out-of-date */ |
3915 | if (!(status_flags & DM_STATUS_NOFLUSH_FLAG) && !dm_suspended(ti)) | |
020cc3b5 | 3916 | (void) commit(pool); |
1f4e0ff0 | 3917 | |
fd7c092e MP |
3918 | r = dm_pool_get_metadata_transaction_id(pool->pmd, &transaction_id); |
3919 | if (r) { | |
4fa5971a MS |
3920 | DMERR("%s: dm_pool_get_metadata_transaction_id returned %d", |
3921 | dm_device_name(pool->pool_md), r); | |
fd7c092e MP |
3922 | goto err; |
3923 | } | |
991d9fa0 | 3924 | |
fd7c092e MP |
3925 | r = dm_pool_get_free_metadata_block_count(pool->pmd, &nr_free_blocks_metadata); |
3926 | if (r) { | |
4fa5971a MS |
3927 | DMERR("%s: dm_pool_get_free_metadata_block_count returned %d", |
3928 | dm_device_name(pool->pool_md), r); | |
fd7c092e MP |
3929 | goto err; |
3930 | } | |
991d9fa0 JT |
3931 | |
3932 | r = dm_pool_get_metadata_dev_size(pool->pmd, &nr_blocks_metadata); | |
fd7c092e | 3933 | if (r) { |
4fa5971a MS |
3934 | DMERR("%s: dm_pool_get_metadata_dev_size returned %d", |
3935 | dm_device_name(pool->pool_md), r); | |
fd7c092e MP |
3936 | goto err; |
3937 | } | |
991d9fa0 | 3938 | |
fd7c092e MP |
3939 | r = dm_pool_get_free_block_count(pool->pmd, &nr_free_blocks_data); |
3940 | if (r) { | |
4fa5971a MS |
3941 | DMERR("%s: dm_pool_get_free_block_count returned %d", |
3942 | dm_device_name(pool->pool_md), r); | |
fd7c092e MP |
3943 | goto err; |
3944 | } | |
991d9fa0 JT |
3945 | |
3946 | r = dm_pool_get_data_dev_size(pool->pmd, &nr_blocks_data); | |
fd7c092e | 3947 | if (r) { |
4fa5971a MS |
3948 | DMERR("%s: dm_pool_get_data_dev_size returned %d", |
3949 | dm_device_name(pool->pool_md), r); | |
fd7c092e MP |
3950 | goto err; |
3951 | } | |
991d9fa0 | 3952 | |
cc8394d8 | 3953 | r = dm_pool_get_metadata_snap(pool->pmd, &held_root); |
fd7c092e | 3954 | if (r) { |
4fa5971a MS |
3955 | DMERR("%s: dm_pool_get_metadata_snap returned %d", |
3956 | dm_device_name(pool->pool_md), r); | |
fd7c092e MP |
3957 | goto err; |
3958 | } | |
991d9fa0 JT |
3959 | |
3960 | DMEMIT("%llu %llu/%llu %llu/%llu ", | |
3961 | (unsigned long long)transaction_id, | |
3962 | (unsigned long long)(nr_blocks_metadata - nr_free_blocks_metadata), | |
3963 | (unsigned long long)nr_blocks_metadata, | |
3964 | (unsigned long long)(nr_blocks_data - nr_free_blocks_data), | |
3965 | (unsigned long long)nr_blocks_data); | |
3966 | ||
3967 | if (held_root) | |
e49e5829 JT |
3968 | DMEMIT("%llu ", held_root); |
3969 | else | |
3970 | DMEMIT("- "); | |
3971 | ||
7e420796 JT |
3972 | mode = get_pool_mode(pool); |
3973 | if (mode == PM_OUT_OF_DATA_SPACE) | |
3e1a0699 | 3974 | DMEMIT("out_of_data_space "); |
7e420796 | 3975 | else if (is_read_only_pool_mode(mode)) |
e49e5829 | 3976 | DMEMIT("ro "); |
991d9fa0 | 3977 | else |
e49e5829 JT |
3978 | DMEMIT("rw "); |
3979 | ||
018debea | 3980 | if (!pool->pf.discard_enabled) |
787a996c | 3981 | DMEMIT("ignore_discard "); |
018debea | 3982 | else if (pool->pf.discard_passdown) |
787a996c MS |
3983 | DMEMIT("discard_passdown "); |
3984 | else | |
3985 | DMEMIT("no_discard_passdown "); | |
3986 | ||
3987 | if (pool->pf.error_if_no_space) | |
3988 | DMEMIT("error_if_no_space "); | |
e49e5829 | 3989 | else |
787a996c | 3990 | DMEMIT("queue_if_no_space "); |
991d9fa0 | 3991 | |
e4c78e21 MS |
3992 | if (dm_pool_metadata_needs_check(pool->pmd)) |
3993 | DMEMIT("needs_check "); | |
3994 | else | |
3995 | DMEMIT("- "); | |
3996 | ||
991d9fa0 JT |
3997 | break; |
3998 | ||
3999 | case STATUSTYPE_TABLE: | |
4000 | DMEMIT("%s %s %lu %llu ", | |
4001 | format_dev_t(buf, pt->metadata_dev->bdev->bd_dev), | |
4002 | format_dev_t(buf2, pt->data_dev->bdev->bd_dev), | |
4003 | (unsigned long)pool->sectors_per_block, | |
4004 | (unsigned long long)pt->low_water_blocks); | |
0424caa1 | 4005 | emit_flags(&pt->requested_pf, result, sz, maxlen); |
991d9fa0 JT |
4006 | break; |
4007 | } | |
fd7c092e | 4008 | return; |
991d9fa0 | 4009 | |
fd7c092e MP |
4010 | err: |
4011 | DMEMIT("Error"); | |
991d9fa0 JT |
4012 | } |
4013 | ||
4014 | static int pool_iterate_devices(struct dm_target *ti, | |
4015 | iterate_devices_callout_fn fn, void *data) | |
4016 | { | |
4017 | struct pool_c *pt = ti->private; | |
4018 | ||
4019 | return fn(ti, pt->data_dev, 0, ti->len, data); | |
4020 | } | |
4021 | ||
991d9fa0 JT |
4022 | static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits) |
4023 | { | |
4024 | struct pool_c *pt = ti->private; | |
4025 | struct pool *pool = pt->pool; | |
604ea906 MS |
4026 | sector_t io_opt_sectors = limits->io_opt >> SECTOR_SHIFT; |
4027 | ||
4028 | /* | |
d200c30e MS |
4029 | * If max_sectors is smaller than pool->sectors_per_block adjust it |
4030 | * to the highest possible power-of-2 factor of pool->sectors_per_block. | |
4031 | * This is especially beneficial when the pool's data device is a RAID | |
4032 | * device that has a full stripe width that matches pool->sectors_per_block | |
4033 | * -- because even though partial RAID stripe-sized IOs will be issued to a | |
4034 | * single RAID stripe; when aggregated they will end on a full RAID stripe | |
4035 | * boundary.. which avoids additional partial RAID stripe writes cascading | |
604ea906 | 4036 | */ |
604ea906 MS |
4037 | if (limits->max_sectors < pool->sectors_per_block) { |
4038 | while (!is_factor(pool->sectors_per_block, limits->max_sectors)) { | |
4039 | if ((limits->max_sectors & (limits->max_sectors - 1)) == 0) | |
4040 | limits->max_sectors--; | |
4041 | limits->max_sectors = rounddown_pow_of_two(limits->max_sectors); | |
4042 | } | |
604ea906 | 4043 | } |
991d9fa0 | 4044 | |
0cc67cd9 MS |
4045 | /* |
4046 | * If the system-determined stacked limits are compatible with the | |
4047 | * pool's blocksize (io_opt is a factor) do not override them. | |
4048 | */ | |
4049 | if (io_opt_sectors < pool->sectors_per_block || | |
604ea906 MS |
4050 | !is_factor(io_opt_sectors, pool->sectors_per_block)) { |
4051 | if (is_factor(pool->sectors_per_block, limits->max_sectors)) | |
4052 | blk_limits_io_min(limits, limits->max_sectors << SECTOR_SHIFT); | |
4053 | else | |
4054 | blk_limits_io_min(limits, pool->sectors_per_block << SECTOR_SHIFT); | |
0cc67cd9 MS |
4055 | blk_limits_io_opt(limits, pool->sectors_per_block << SECTOR_SHIFT); |
4056 | } | |
0424caa1 MS |
4057 | |
4058 | /* | |
4059 | * pt->adjusted_pf is a staging area for the actual features to use. | |
4060 | * They get transferred to the live pool in bind_control_target() | |
4061 | * called from pool_preresume(). | |
4062 | */ | |
b60ab990 MS |
4063 | if (!pt->adjusted_pf.discard_enabled) { |
4064 | /* | |
4065 | * Must explicitly disallow stacking discard limits otherwise the | |
4066 | * block layer will stack them if pool's data device has support. | |
4067 | * QUEUE_FLAG_DISCARD wouldn't be set but there is no way for the | |
4068 | * user to see that, so make sure to set all discard limits to 0. | |
4069 | */ | |
4070 | limits->discard_granularity = 0; | |
0424caa1 | 4071 | return; |
b60ab990 | 4072 | } |
0424caa1 MS |
4073 | |
4074 | disable_passdown_if_not_supported(pt); | |
4075 | ||
34fbcf62 JT |
4076 | /* |
4077 | * The pool uses the same discard limits as the underlying data | |
4078 | * device. DM core has already set this up. | |
4079 | */ | |
991d9fa0 JT |
4080 | } |
4081 | ||
4082 | static struct target_type pool_target = { | |
4083 | .name = "thin-pool", | |
4084 | .features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE | | |
4085 | DM_TARGET_IMMUTABLE, | |
202bae52 | 4086 | .version = {1, 19, 0}, |
991d9fa0 JT |
4087 | .module = THIS_MODULE, |
4088 | .ctr = pool_ctr, | |
4089 | .dtr = pool_dtr, | |
4090 | .map = pool_map, | |
80e96c54 MS |
4091 | .presuspend = pool_presuspend, |
4092 | .presuspend_undo = pool_presuspend_undo, | |
991d9fa0 JT |
4093 | .postsuspend = pool_postsuspend, |
4094 | .preresume = pool_preresume, | |
4095 | .resume = pool_resume, | |
4096 | .message = pool_message, | |
4097 | .status = pool_status, | |
991d9fa0 JT |
4098 | .iterate_devices = pool_iterate_devices, |
4099 | .io_hints = pool_io_hints, | |
4100 | }; | |
4101 | ||
4102 | /*---------------------------------------------------------------- | |
4103 | * Thin target methods | |
4104 | *--------------------------------------------------------------*/ | |
b10ebd34 JT |
4105 | static void thin_get(struct thin_c *tc) |
4106 | { | |
4107 | atomic_inc(&tc->refcount); | |
4108 | } | |
4109 | ||
4110 | static void thin_put(struct thin_c *tc) | |
4111 | { | |
4112 | if (atomic_dec_and_test(&tc->refcount)) | |
4113 | complete(&tc->can_destroy); | |
4114 | } | |
4115 | ||
991d9fa0 JT |
4116 | static void thin_dtr(struct dm_target *ti) |
4117 | { | |
4118 | struct thin_c *tc = ti->private; | |
c140e1c4 MS |
4119 | unsigned long flags; |
4120 | ||
4121 | spin_lock_irqsave(&tc->pool->lock, flags); | |
4122 | list_del_rcu(&tc->list); | |
4123 | spin_unlock_irqrestore(&tc->pool->lock, flags); | |
4124 | synchronize_rcu(); | |
991d9fa0 | 4125 | |
17181fb7 MP |
4126 | thin_put(tc); |
4127 | wait_for_completion(&tc->can_destroy); | |
4128 | ||
991d9fa0 JT |
4129 | mutex_lock(&dm_thin_pool_table.mutex); |
4130 | ||
4131 | __pool_dec(tc->pool); | |
4132 | dm_pool_close_thin_device(tc->td); | |
4133 | dm_put_device(ti, tc->pool_dev); | |
2dd9c257 JT |
4134 | if (tc->origin_dev) |
4135 | dm_put_device(ti, tc->origin_dev); | |
991d9fa0 JT |
4136 | kfree(tc); |
4137 | ||
4138 | mutex_unlock(&dm_thin_pool_table.mutex); | |
4139 | } | |
4140 | ||
4141 | /* | |
4142 | * Thin target parameters: | |
4143 | * | |
2dd9c257 | 4144 | * <pool_dev> <dev_id> [origin_dev] |
991d9fa0 JT |
4145 | * |
4146 | * pool_dev: the path to the pool (eg, /dev/mapper/my_pool) | |
4147 | * dev_id: the internal device identifier | |
2dd9c257 | 4148 | * origin_dev: a device external to the pool that should act as the origin |
67e2e2b2 JT |
4149 | * |
4150 | * If the pool device has discards disabled, they get disabled for the thin | |
4151 | * device as well. | |
991d9fa0 JT |
4152 | */ |
4153 | static int thin_ctr(struct dm_target *ti, unsigned argc, char **argv) | |
4154 | { | |
4155 | int r; | |
4156 | struct thin_c *tc; | |
2dd9c257 | 4157 | struct dm_dev *pool_dev, *origin_dev; |
991d9fa0 | 4158 | struct mapped_device *pool_md; |
5e3283e2 | 4159 | unsigned long flags; |
991d9fa0 JT |
4160 | |
4161 | mutex_lock(&dm_thin_pool_table.mutex); | |
4162 | ||
2dd9c257 | 4163 | if (argc != 2 && argc != 3) { |
991d9fa0 JT |
4164 | ti->error = "Invalid argument count"; |
4165 | r = -EINVAL; | |
4166 | goto out_unlock; | |
4167 | } | |
4168 | ||
4169 | tc = ti->private = kzalloc(sizeof(*tc), GFP_KERNEL); | |
4170 | if (!tc) { | |
4171 | ti->error = "Out of memory"; | |
4172 | r = -ENOMEM; | |
4173 | goto out_unlock; | |
4174 | } | |
583024d2 | 4175 | tc->thin_md = dm_table_get_md(ti->table); |
c140e1c4 | 4176 | spin_lock_init(&tc->lock); |
a374bb21 | 4177 | INIT_LIST_HEAD(&tc->deferred_cells); |
c140e1c4 MS |
4178 | bio_list_init(&tc->deferred_bio_list); |
4179 | bio_list_init(&tc->retry_on_resume_list); | |
67324ea1 | 4180 | tc->sort_bio_list = RB_ROOT; |
991d9fa0 | 4181 | |
2dd9c257 | 4182 | if (argc == 3) { |
a927950a JCXF |
4183 | if (!strcmp(argv[0], argv[2])) { |
4184 | ti->error = "Error setting origin device"; | |
4185 | r = -EINVAL; | |
4186 | goto bad_origin_dev; | |
4187 | } | |
4188 | ||
2dd9c257 JT |
4189 | r = dm_get_device(ti, argv[2], FMODE_READ, &origin_dev); |
4190 | if (r) { | |
4191 | ti->error = "Error opening origin device"; | |
4192 | goto bad_origin_dev; | |
4193 | } | |
4194 | tc->origin_dev = origin_dev; | |
4195 | } | |
4196 | ||
991d9fa0 JT |
4197 | r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &pool_dev); |
4198 | if (r) { | |
4199 | ti->error = "Error opening pool device"; | |
4200 | goto bad_pool_dev; | |
4201 | } | |
4202 | tc->pool_dev = pool_dev; | |
4203 | ||
4204 | if (read_dev_id(argv[1], (unsigned long long *)&tc->dev_id, 0)) { | |
4205 | ti->error = "Invalid device id"; | |
4206 | r = -EINVAL; | |
4207 | goto bad_common; | |
4208 | } | |
4209 | ||
4210 | pool_md = dm_get_md(tc->pool_dev->bdev->bd_dev); | |
4211 | if (!pool_md) { | |
4212 | ti->error = "Couldn't get pool mapped device"; | |
4213 | r = -EINVAL; | |
4214 | goto bad_common; | |
4215 | } | |
4216 | ||
4217 | tc->pool = __pool_table_lookup(pool_md); | |
4218 | if (!tc->pool) { | |
4219 | ti->error = "Couldn't find pool object"; | |
4220 | r = -EINVAL; | |
4221 | goto bad_pool_lookup; | |
4222 | } | |
4223 | __pool_inc(tc->pool); | |
4224 | ||
e49e5829 JT |
4225 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
4226 | ti->error = "Couldn't open thin device, Pool is in fail mode"; | |
1acacc07 | 4227 | r = -EINVAL; |
80e96c54 | 4228 | goto bad_pool; |
e49e5829 JT |
4229 | } |
4230 | ||
991d9fa0 JT |
4231 | r = dm_pool_open_thin_device(tc->pool->pmd, tc->dev_id, &tc->td); |
4232 | if (r) { | |
4233 | ti->error = "Couldn't open thin internal device"; | |
80e96c54 | 4234 | goto bad_pool; |
991d9fa0 JT |
4235 | } |
4236 | ||
542f9038 MS |
4237 | r = dm_set_target_max_io_len(ti, tc->pool->sectors_per_block); |
4238 | if (r) | |
80e96c54 | 4239 | goto bad; |
542f9038 | 4240 | |
55a62eef | 4241 | ti->num_flush_bios = 1; |
16ad3d10 | 4242 | ti->flush_supported = true; |
30187e1d | 4243 | ti->per_io_data_size = sizeof(struct dm_thin_endio_hook); |
67e2e2b2 JT |
4244 | |
4245 | /* In case the pool supports discards, pass them on. */ | |
4246 | if (tc->pool->pf.discard_enabled) { | |
0ac55489 | 4247 | ti->discards_supported = true; |
55a62eef | 4248 | ti->num_discard_bios = 1; |
34fbcf62 | 4249 | ti->split_discard_bios = false; |
67e2e2b2 | 4250 | } |
991d9fa0 | 4251 | |
991d9fa0 JT |
4252 | mutex_unlock(&dm_thin_pool_table.mutex); |
4253 | ||
5e3283e2 | 4254 | spin_lock_irqsave(&tc->pool->lock, flags); |
80e96c54 MS |
4255 | if (tc->pool->suspended) { |
4256 | spin_unlock_irqrestore(&tc->pool->lock, flags); | |
4257 | mutex_lock(&dm_thin_pool_table.mutex); /* reacquire for __pool_dec */ | |
4258 | ti->error = "Unable to activate thin device while pool is suspended"; | |
4259 | r = -EINVAL; | |
4260 | goto bad; | |
4261 | } | |
2b94e896 MD |
4262 | atomic_set(&tc->refcount, 1); |
4263 | init_completion(&tc->can_destroy); | |
c140e1c4 | 4264 | list_add_tail_rcu(&tc->list, &tc->pool->active_thins); |
5e3283e2 | 4265 | spin_unlock_irqrestore(&tc->pool->lock, flags); |
c140e1c4 MS |
4266 | /* |
4267 | * This synchronize_rcu() call is needed here otherwise we risk a | |
4268 | * wake_worker() call finding no bios to process (because the newly | |
4269 | * added tc isn't yet visible). So this reduces latency since we | |
4270 | * aren't then dependent on the periodic commit to wake_worker(). | |
4271 | */ | |
4272 | synchronize_rcu(); | |
4273 | ||
80e96c54 MS |
4274 | dm_put(pool_md); |
4275 | ||
991d9fa0 JT |
4276 | return 0; |
4277 | ||
80e96c54 | 4278 | bad: |
1acacc07 | 4279 | dm_pool_close_thin_device(tc->td); |
80e96c54 | 4280 | bad_pool: |
991d9fa0 JT |
4281 | __pool_dec(tc->pool); |
4282 | bad_pool_lookup: | |
4283 | dm_put(pool_md); | |
4284 | bad_common: | |
4285 | dm_put_device(ti, tc->pool_dev); | |
4286 | bad_pool_dev: | |
2dd9c257 JT |
4287 | if (tc->origin_dev) |
4288 | dm_put_device(ti, tc->origin_dev); | |
4289 | bad_origin_dev: | |
991d9fa0 JT |
4290 | kfree(tc); |
4291 | out_unlock: | |
4292 | mutex_unlock(&dm_thin_pool_table.mutex); | |
4293 | ||
4294 | return r; | |
4295 | } | |
4296 | ||
7de3ee57 | 4297 | static int thin_map(struct dm_target *ti, struct bio *bio) |
991d9fa0 | 4298 | { |
4f024f37 | 4299 | bio->bi_iter.bi_sector = dm_target_offset(ti, bio->bi_iter.bi_sector); |
991d9fa0 | 4300 | |
7de3ee57 | 4301 | return thin_bio_map(ti, bio); |
991d9fa0 JT |
4302 | } |
4303 | ||
4e4cbee9 CH |
4304 | static int thin_endio(struct dm_target *ti, struct bio *bio, |
4305 | blk_status_t *err) | |
eb2aa48d JT |
4306 | { |
4307 | unsigned long flags; | |
59c3d2c6 | 4308 | struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook)); |
eb2aa48d | 4309 | struct list_head work; |
a24c2569 | 4310 | struct dm_thin_new_mapping *m, *tmp; |
eb2aa48d JT |
4311 | struct pool *pool = h->tc->pool; |
4312 | ||
4313 | if (h->shared_read_entry) { | |
4314 | INIT_LIST_HEAD(&work); | |
44feb387 | 4315 | dm_deferred_entry_dec(h->shared_read_entry, &work); |
eb2aa48d JT |
4316 | |
4317 | spin_lock_irqsave(&pool->lock, flags); | |
4318 | list_for_each_entry_safe(m, tmp, &work, list) { | |
4319 | list_del(&m->list); | |
50f3c3ef | 4320 | __complete_mapping_preparation(m); |
eb2aa48d JT |
4321 | } |
4322 | spin_unlock_irqrestore(&pool->lock, flags); | |
4323 | } | |
4324 | ||
104655fd JT |
4325 | if (h->all_io_entry) { |
4326 | INIT_LIST_HEAD(&work); | |
44feb387 | 4327 | dm_deferred_entry_dec(h->all_io_entry, &work); |
563af186 JT |
4328 | if (!list_empty(&work)) { |
4329 | spin_lock_irqsave(&pool->lock, flags); | |
4330 | list_for_each_entry_safe(m, tmp, &work, list) | |
daec338b | 4331 | list_add_tail(&m->list, &pool->prepared_discards); |
563af186 JT |
4332 | spin_unlock_irqrestore(&pool->lock, flags); |
4333 | wake_worker(pool); | |
4334 | } | |
104655fd JT |
4335 | } |
4336 | ||
34fbcf62 JT |
4337 | if (h->cell) |
4338 | cell_defer_no_holder(h->tc, h->cell); | |
4339 | ||
1be56909 | 4340 | return DM_ENDIO_DONE; |
eb2aa48d JT |
4341 | } |
4342 | ||
738211f7 | 4343 | static void thin_presuspend(struct dm_target *ti) |
991d9fa0 | 4344 | { |
738211f7 JT |
4345 | struct thin_c *tc = ti->private; |
4346 | ||
991d9fa0 | 4347 | if (dm_noflush_suspending(ti)) |
738211f7 JT |
4348 | noflush_work(tc, do_noflush_start); |
4349 | } | |
4350 | ||
4351 | static void thin_postsuspend(struct dm_target *ti) | |
4352 | { | |
4353 | struct thin_c *tc = ti->private; | |
4354 | ||
4355 | /* | |
4356 | * The dm_noflush_suspending flag has been cleared by now, so | |
4357 | * unfortunately we must always run this. | |
4358 | */ | |
4359 | noflush_work(tc, do_noflush_stop); | |
991d9fa0 JT |
4360 | } |
4361 | ||
e5aea7b4 JT |
4362 | static int thin_preresume(struct dm_target *ti) |
4363 | { | |
4364 | struct thin_c *tc = ti->private; | |
4365 | ||
4366 | if (tc->origin_dev) | |
4367 | tc->origin_size = get_dev_size(tc->origin_dev->bdev); | |
4368 | ||
4369 | return 0; | |
4370 | } | |
4371 | ||
991d9fa0 JT |
4372 | /* |
4373 | * <nr mapped sectors> <highest mapped sector> | |
4374 | */ | |
fd7c092e MP |
4375 | static void thin_status(struct dm_target *ti, status_type_t type, |
4376 | unsigned status_flags, char *result, unsigned maxlen) | |
991d9fa0 JT |
4377 | { |
4378 | int r; | |
4379 | ssize_t sz = 0; | |
4380 | dm_block_t mapped, highest; | |
4381 | char buf[BDEVNAME_SIZE]; | |
4382 | struct thin_c *tc = ti->private; | |
4383 | ||
e49e5829 JT |
4384 | if (get_pool_mode(tc->pool) == PM_FAIL) { |
4385 | DMEMIT("Fail"); | |
fd7c092e | 4386 | return; |
e49e5829 JT |
4387 | } |
4388 | ||
991d9fa0 JT |
4389 | if (!tc->td) |
4390 | DMEMIT("-"); | |
4391 | else { | |
4392 | switch (type) { | |
4393 | case STATUSTYPE_INFO: | |
4394 | r = dm_thin_get_mapped_count(tc->td, &mapped); | |
fd7c092e MP |
4395 | if (r) { |
4396 | DMERR("dm_thin_get_mapped_count returned %d", r); | |
4397 | goto err; | |
4398 | } | |
991d9fa0 JT |
4399 | |
4400 | r = dm_thin_get_highest_mapped_block(tc->td, &highest); | |
fd7c092e MP |
4401 | if (r < 0) { |
4402 | DMERR("dm_thin_get_highest_mapped_block returned %d", r); | |
4403 | goto err; | |
4404 | } | |
991d9fa0 JT |
4405 | |
4406 | DMEMIT("%llu ", mapped * tc->pool->sectors_per_block); | |
4407 | if (r) | |
4408 | DMEMIT("%llu", ((highest + 1) * | |
4409 | tc->pool->sectors_per_block) - 1); | |
4410 | else | |
4411 | DMEMIT("-"); | |
4412 | break; | |
4413 | ||
4414 | case STATUSTYPE_TABLE: | |
4415 | DMEMIT("%s %lu", | |
4416 | format_dev_t(buf, tc->pool_dev->bdev->bd_dev), | |
4417 | (unsigned long) tc->dev_id); | |
2dd9c257 JT |
4418 | if (tc->origin_dev) |
4419 | DMEMIT(" %s", format_dev_t(buf, tc->origin_dev->bdev->bd_dev)); | |
991d9fa0 JT |
4420 | break; |
4421 | } | |
4422 | } | |
4423 | ||
fd7c092e MP |
4424 | return; |
4425 | ||
4426 | err: | |
4427 | DMEMIT("Error"); | |
991d9fa0 JT |
4428 | } |
4429 | ||
4430 | static int thin_iterate_devices(struct dm_target *ti, | |
4431 | iterate_devices_callout_fn fn, void *data) | |
4432 | { | |
55f2b8bd | 4433 | sector_t blocks; |
991d9fa0 | 4434 | struct thin_c *tc = ti->private; |
55f2b8bd | 4435 | struct pool *pool = tc->pool; |
991d9fa0 JT |
4436 | |
4437 | /* | |
4438 | * We can't call dm_pool_get_data_dev_size() since that blocks. So | |
4439 | * we follow a more convoluted path through to the pool's target. | |
4440 | */ | |
55f2b8bd | 4441 | if (!pool->ti) |
991d9fa0 JT |
4442 | return 0; /* nothing is bound */ |
4443 | ||
55f2b8bd MS |
4444 | blocks = pool->ti->len; |
4445 | (void) sector_div(blocks, pool->sectors_per_block); | |
991d9fa0 | 4446 | if (blocks) |
55f2b8bd | 4447 | return fn(ti, tc->pool_dev, 0, pool->sectors_per_block * blocks, data); |
991d9fa0 JT |
4448 | |
4449 | return 0; | |
4450 | } | |
4451 | ||
34fbcf62 JT |
4452 | static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits) |
4453 | { | |
4454 | struct thin_c *tc = ti->private; | |
4455 | struct pool *pool = tc->pool; | |
21607670 | 4456 | |
0fcb04d5 MS |
4457 | if (!pool->pf.discard_enabled) |
4458 | return; | |
34fbcf62 JT |
4459 | |
4460 | limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT; | |
4461 | limits->max_discard_sectors = 2048 * 1024 * 16; /* 16G */ | |
4462 | } | |
4463 | ||
991d9fa0 JT |
4464 | static struct target_type thin_target = { |
4465 | .name = "thin", | |
202bae52 | 4466 | .version = {1, 19, 0}, |
991d9fa0 JT |
4467 | .module = THIS_MODULE, |
4468 | .ctr = thin_ctr, | |
4469 | .dtr = thin_dtr, | |
4470 | .map = thin_map, | |
eb2aa48d | 4471 | .end_io = thin_endio, |
e5aea7b4 | 4472 | .preresume = thin_preresume, |
738211f7 | 4473 | .presuspend = thin_presuspend, |
991d9fa0 JT |
4474 | .postsuspend = thin_postsuspend, |
4475 | .status = thin_status, | |
4476 | .iterate_devices = thin_iterate_devices, | |
34fbcf62 | 4477 | .io_hints = thin_io_hints, |
991d9fa0 JT |
4478 | }; |
4479 | ||
4480 | /*----------------------------------------------------------------*/ | |
4481 | ||
4482 | static int __init dm_thin_init(void) | |
4483 | { | |
7e6358d2 | 4484 | int r = -ENOMEM; |
991d9fa0 JT |
4485 | |
4486 | pool_table_init(); | |
4487 | ||
7e6358d2 | 4488 | _new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, 0); |
4489 | if (!_new_mapping_cache) | |
4490 | return r; | |
4491 | ||
991d9fa0 JT |
4492 | r = dm_register_target(&thin_target); |
4493 | if (r) | |
7e6358d2 | 4494 | goto bad_new_mapping_cache; |
991d9fa0 JT |
4495 | |
4496 | r = dm_register_target(&pool_target); | |
4497 | if (r) | |
7e6358d2 | 4498 | goto bad_thin_target; |
a24c2569 | 4499 | |
a24c2569 MS |
4500 | return 0; |
4501 | ||
7e6358d2 | 4502 | bad_thin_target: |
a24c2569 | 4503 | dm_unregister_target(&thin_target); |
7e6358d2 | 4504 | bad_new_mapping_cache: |
4505 | kmem_cache_destroy(_new_mapping_cache); | |
991d9fa0 JT |
4506 | |
4507 | return r; | |
4508 | } | |
4509 | ||
4510 | static void dm_thin_exit(void) | |
4511 | { | |
4512 | dm_unregister_target(&thin_target); | |
4513 | dm_unregister_target(&pool_target); | |
a24c2569 | 4514 | |
a24c2569 | 4515 | kmem_cache_destroy(_new_mapping_cache); |
991d9fa0 JT |
4516 | } |
4517 | ||
4518 | module_init(dm_thin_init); | |
4519 | module_exit(dm_thin_exit); | |
4520 | ||
80c57893 MS |
4521 | module_param_named(no_space_timeout, no_space_timeout_secs, uint, S_IRUGO | S_IWUSR); |
4522 | MODULE_PARM_DESC(no_space_timeout, "Out of data space queue IO timeout in seconds"); | |
4523 | ||
7cab8bf1 | 4524 | MODULE_DESCRIPTION(DM_NAME " thin provisioning target"); |
991d9fa0 JT |
4525 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); |
4526 | MODULE_LICENSE("GPL"); |