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3bd94003 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
991d9fa0 | 2 | /* |
da105ed5 | 3 | * Copyright (C) 2011-2012 Red Hat, Inc. |
991d9fa0 JT |
4 | * |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
8 | #include "dm-thin-metadata.h" | |
9 | #include "persistent-data/dm-btree.h" | |
10 | #include "persistent-data/dm-space-map.h" | |
11 | #include "persistent-data/dm-space-map-disk.h" | |
12 | #include "persistent-data/dm-transaction-manager.h" | |
13 | ||
14 | #include <linux/list.h> | |
15 | #include <linux/device-mapper.h> | |
16 | #include <linux/workqueue.h> | |
17 | ||
a4a82ce3 HM |
18 | /* |
19 | *-------------------------------------------------------------------------- | |
991d9fa0 JT |
20 | * As far as the metadata goes, there is: |
21 | * | |
22 | * - A superblock in block zero, taking up fewer than 512 bytes for | |
23 | * atomic writes. | |
24 | * | |
25 | * - A space map managing the metadata blocks. | |
26 | * | |
27 | * - A space map managing the data blocks. | |
28 | * | |
29 | * - A btree mapping our internal thin dev ids onto struct disk_device_details. | |
30 | * | |
31 | * - A hierarchical btree, with 2 levels which effectively maps (thin | |
32 | * dev id, virtual block) -> block_time. Block time is a 64-bit | |
43069040 | 33 | * field holding the time in the low 24 bits, and block in the top 40 |
991d9fa0 JT |
34 | * bits. |
35 | * | |
36 | * BTrees consist solely of btree_nodes, that fill a block. Some are | |
37 | * internal nodes, as such their values are a __le64 pointing to other | |
38 | * nodes. Leaf nodes can store data of any reasonable size (ie. much | |
39 | * smaller than the block size). The nodes consist of the header, | |
40 | * followed by an array of keys, followed by an array of values. We have | |
41 | * to binary search on the keys so they're all held together to help the | |
42 | * cpu cache. | |
43 | * | |
44 | * Space maps have 2 btrees: | |
45 | * | |
46 | * - One maps a uint64_t onto a struct index_entry. Which points to a | |
47 | * bitmap block, and has some details about how many free entries there | |
48 | * are etc. | |
49 | * | |
50 | * - The bitmap blocks have a header (for the checksum). Then the rest | |
51 | * of the block is pairs of bits. With the meaning being: | |
52 | * | |
53 | * 0 - ref count is 0 | |
54 | * 1 - ref count is 1 | |
55 | * 2 - ref count is 2 | |
56 | * 3 - ref count is higher than 2 | |
57 | * | |
58 | * - If the count is higher than 2 then the ref count is entered in a | |
59 | * second btree that directly maps the block_address to a uint32_t ref | |
60 | * count. | |
61 | * | |
62 | * The space map metadata variant doesn't have a bitmaps btree. Instead | |
63 | * it has one single blocks worth of index_entries. This avoids | |
64 | * recursive issues with the bitmap btree needing to allocate space in | |
65 | * order to insert. With a small data block size such as 64k the | |
66 | * metadata support data devices that are hundreds of terrabytes. | |
67 | * | |
68 | * The space maps allocate space linearly from front to back. Space that | |
69 | * is freed in a transaction is never recycled within that transaction. | |
70 | * To try and avoid fragmenting _free_ space the allocator always goes | |
71 | * back and fills in gaps. | |
72 | * | |
73 | * All metadata io is in THIN_METADATA_BLOCK_SIZE sized/aligned chunks | |
74 | * from the block manager. | |
a4a82ce3 HM |
75 | *-------------------------------------------------------------------------- |
76 | */ | |
991d9fa0 JT |
77 | |
78 | #define DM_MSG_PREFIX "thin metadata" | |
79 | ||
80 | #define THIN_SUPERBLOCK_MAGIC 27022010 | |
81 | #define THIN_SUPERBLOCK_LOCATION 0 | |
07f2b6e0 | 82 | #define THIN_VERSION 2 |
991d9fa0 JT |
83 | #define SECTOR_TO_BLOCK_SHIFT 3 |
84 | ||
8c971178 | 85 | /* |
490ae017 | 86 | * For btree insert: |
8c971178 JT |
87 | * 3 for btree insert + |
88 | * 2 for btree lookup used within space map | |
490ae017 DY |
89 | * For btree remove: |
90 | * 2 for shadow spine + | |
91 | * 4 for rebalance 3 child node | |
8c971178 | 92 | */ |
490ae017 | 93 | #define THIN_MAX_CONCURRENT_LOCKS 6 |
8c971178 | 94 | |
991d9fa0 JT |
95 | /* This should be plenty */ |
96 | #define SPACE_MAP_ROOT_SIZE 128 | |
97 | ||
98 | /* | |
99 | * Little endian on-disk superblock and device details. | |
100 | */ | |
101 | struct thin_disk_superblock { | |
102 | __le32 csum; /* Checksum of superblock except for this field. */ | |
103 | __le32 flags; | |
104 | __le64 blocknr; /* This block number, dm_block_t. */ | |
105 | ||
106 | __u8 uuid[16]; | |
107 | __le64 magic; | |
108 | __le32 version; | |
109 | __le32 time; | |
110 | ||
111 | __le64 trans_id; | |
112 | ||
113 | /* | |
114 | * Root held by userspace transactions. | |
115 | */ | |
116 | __le64 held_root; | |
117 | ||
118 | __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
119 | __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
120 | ||
121 | /* | |
122 | * 2-level btree mapping (dev_id, (dev block, time)) -> data block | |
123 | */ | |
124 | __le64 data_mapping_root; | |
125 | ||
126 | /* | |
127 | * Device detail root mapping dev_id -> device_details | |
128 | */ | |
129 | __le64 device_details_root; | |
130 | ||
131 | __le32 data_block_size; /* In 512-byte sectors. */ | |
132 | ||
133 | __le32 metadata_block_size; /* In 512-byte sectors. */ | |
134 | __le64 metadata_nr_blocks; | |
135 | ||
136 | __le32 compat_flags; | |
137 | __le32 compat_ro_flags; | |
138 | __le32 incompat_flags; | |
139 | } __packed; | |
140 | ||
141 | struct disk_device_details { | |
142 | __le64 mapped_blocks; | |
143 | __le64 transaction_id; /* When created. */ | |
144 | __le32 creation_time; | |
145 | __le32 snapshotted_time; | |
146 | } __packed; | |
147 | ||
148 | struct dm_pool_metadata { | |
149 | struct hlist_node hash; | |
150 | ||
151 | struct block_device *bdev; | |
152 | struct dm_block_manager *bm; | |
153 | struct dm_space_map *metadata_sm; | |
154 | struct dm_space_map *data_sm; | |
155 | struct dm_transaction_manager *tm; | |
156 | struct dm_transaction_manager *nb_tm; | |
157 | ||
158 | /* | |
159 | * Two-level btree. | |
160 | * First level holds thin_dev_t. | |
161 | * Second level holds mappings. | |
162 | */ | |
163 | struct dm_btree_info info; | |
164 | ||
165 | /* | |
166 | * Non-blocking version of the above. | |
167 | */ | |
168 | struct dm_btree_info nb_info; | |
169 | ||
170 | /* | |
171 | * Just the top level for deleting whole devices. | |
172 | */ | |
173 | struct dm_btree_info tl_info; | |
174 | ||
175 | /* | |
176 | * Just the bottom level for creating new devices. | |
177 | */ | |
178 | struct dm_btree_info bl_info; | |
179 | ||
180 | /* | |
181 | * Describes the device details btree. | |
182 | */ | |
183 | struct dm_btree_info details_info; | |
184 | ||
185 | struct rw_semaphore root_lock; | |
186 | uint32_t time; | |
991d9fa0 JT |
187 | dm_block_t root; |
188 | dm_block_t details_root; | |
189 | struct list_head thin_devices; | |
190 | uint64_t trans_id; | |
191 | unsigned long flags; | |
192 | sector_t data_block_size; | |
da105ed5 | 193 | |
ecda7c02 NT |
194 | /* |
195 | * Pre-commit callback. | |
196 | * | |
197 | * This allows the thin provisioning target to run a callback before | |
198 | * the metadata are committed. | |
199 | */ | |
200 | dm_pool_pre_commit_fn pre_commit_fn; | |
201 | void *pre_commit_context; | |
202 | ||
3ab91828 JT |
203 | /* |
204 | * We reserve a section of the metadata for commit overhead. | |
205 | * All reported space does *not* include this. | |
206 | */ | |
207 | dm_block_t metadata_reserve; | |
208 | ||
da105ed5 JT |
209 | /* |
210 | * Set if a transaction has to be aborted but the attempt to roll back | |
211 | * to the previous (good) transaction failed. The only pool metadata | |
212 | * operation possible in this state is the closing of the device. | |
213 | */ | |
214 | bool fail_io:1; | |
5a32083d | 215 | |
873f258b MS |
216 | /* |
217 | * Set once a thin-pool has been accessed through one of the interfaces | |
218 | * that imply the pool is in-service (e.g. thin devices created/deleted, | |
219 | * thin-pool message, metadata snapshots, etc). | |
220 | */ | |
221 | bool in_service:1; | |
222 | ||
5a32083d JT |
223 | /* |
224 | * Reading the space map roots can fail, so we read it into these | |
225 | * buffers before the superblock is locked and updated. | |
226 | */ | |
227 | __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
228 | __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
991d9fa0 JT |
229 | }; |
230 | ||
231 | struct dm_thin_device { | |
232 | struct list_head list; | |
233 | struct dm_pool_metadata *pmd; | |
234 | dm_thin_id id; | |
235 | ||
236 | int open_count; | |
da105ed5 JT |
237 | bool changed:1; |
238 | bool aborted_with_changes:1; | |
991d9fa0 JT |
239 | uint64_t mapped_blocks; |
240 | uint64_t transaction_id; | |
241 | uint32_t creation_time; | |
242 | uint32_t snapshotted_time; | |
243 | }; | |
244 | ||
a4a82ce3 HM |
245 | /* |
246 | *-------------------------------------------------------------- | |
991d9fa0 | 247 | * superblock validator |
a4a82ce3 HM |
248 | *-------------------------------------------------------------- |
249 | */ | |
991d9fa0 JT |
250 | #define SUPERBLOCK_CSUM_XOR 160774 |
251 | ||
252 | static void sb_prepare_for_write(struct dm_block_validator *v, | |
253 | struct dm_block *b, | |
254 | size_t block_size) | |
255 | { | |
256 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
257 | ||
258 | disk_super->blocknr = cpu_to_le64(dm_block_location(b)); | |
259 | disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
260 | block_size - sizeof(__le32), | |
261 | SUPERBLOCK_CSUM_XOR)); | |
262 | } | |
263 | ||
264 | static int sb_check(struct dm_block_validator *v, | |
265 | struct dm_block *b, | |
266 | size_t block_size) | |
267 | { | |
268 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
269 | __le32 csum_le; | |
270 | ||
271 | if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) { | |
1c131886 HM |
272 | DMERR("%s failed: blocknr %llu: wanted %llu", |
273 | __func__, le64_to_cpu(disk_super->blocknr), | |
991d9fa0 JT |
274 | (unsigned long long)dm_block_location(b)); |
275 | return -ENOTBLK; | |
276 | } | |
277 | ||
278 | if (le64_to_cpu(disk_super->magic) != THIN_SUPERBLOCK_MAGIC) { | |
1c131886 HM |
279 | DMERR("%s failed: magic %llu: wanted %llu", |
280 | __func__, le64_to_cpu(disk_super->magic), | |
991d9fa0 JT |
281 | (unsigned long long)THIN_SUPERBLOCK_MAGIC); |
282 | return -EILSEQ; | |
283 | } | |
284 | ||
285 | csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
286 | block_size - sizeof(__le32), | |
287 | SUPERBLOCK_CSUM_XOR)); | |
288 | if (csum_le != disk_super->csum) { | |
1c131886 HM |
289 | DMERR("%s failed: csum %u: wanted %u", |
290 | __func__, le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum)); | |
991d9fa0 JT |
291 | return -EILSEQ; |
292 | } | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | static struct dm_block_validator sb_validator = { | |
298 | .name = "superblock", | |
299 | .prepare_for_write = sb_prepare_for_write, | |
300 | .check = sb_check | |
301 | }; | |
302 | ||
a4a82ce3 HM |
303 | /* |
304 | *-------------------------------------------------------------- | |
991d9fa0 | 305 | * Methods for the btree value types |
a4a82ce3 HM |
306 | *-------------------------------------------------------------- |
307 | */ | |
991d9fa0 JT |
308 | static uint64_t pack_block_time(dm_block_t b, uint32_t t) |
309 | { | |
310 | return (b << 24) | t; | |
311 | } | |
312 | ||
313 | static void unpack_block_time(uint64_t v, dm_block_t *b, uint32_t *t) | |
314 | { | |
315 | *b = v >> 24; | |
316 | *t = v & ((1 << 24) - 1); | |
317 | } | |
318 | ||
be500ed7 JT |
319 | /* |
320 | * It's more efficient to call dm_sm_{inc,dec}_blocks as few times as | |
321 | * possible. 'with_runs' reads contiguous runs of blocks, and calls the | |
322 | * given sm function. | |
323 | */ | |
324 | typedef int (*run_fn)(struct dm_space_map *, dm_block_t, dm_block_t); | |
325 | ||
86a3238c | 326 | static void with_runs(struct dm_space_map *sm, const __le64 *value_le, unsigned int count, run_fn fn) |
991d9fa0 | 327 | { |
be500ed7 | 328 | uint64_t b, begin, end; |
991d9fa0 | 329 | uint32_t t; |
be500ed7 | 330 | bool in_run = false; |
86a3238c | 331 | unsigned int i; |
991d9fa0 | 332 | |
be500ed7 JT |
333 | for (i = 0; i < count; i++, value_le++) { |
334 | /* We know value_le is 8 byte aligned */ | |
335 | unpack_block_time(le64_to_cpu(*value_le), &b, &t); | |
336 | ||
337 | if (in_run) { | |
338 | if (b == end) { | |
339 | end++; | |
340 | } else { | |
341 | fn(sm, begin, end); | |
342 | begin = b; | |
343 | end = b + 1; | |
344 | } | |
345 | } else { | |
346 | in_run = true; | |
347 | begin = b; | |
348 | end = b + 1; | |
349 | } | |
350 | } | |
351 | ||
352 | if (in_run) | |
353 | fn(sm, begin, end); | |
991d9fa0 JT |
354 | } |
355 | ||
86a3238c | 356 | static void data_block_inc(void *context, const void *value_le, unsigned int count) |
991d9fa0 | 357 | { |
be500ed7 JT |
358 | with_runs((struct dm_space_map *) context, |
359 | (const __le64 *) value_le, count, dm_sm_inc_blocks); | |
360 | } | |
991d9fa0 | 361 | |
86a3238c | 362 | static void data_block_dec(void *context, const void *value_le, unsigned int count) |
be500ed7 JT |
363 | { |
364 | with_runs((struct dm_space_map *) context, | |
365 | (const __le64 *) value_le, count, dm_sm_dec_blocks); | |
991d9fa0 JT |
366 | } |
367 | ||
018cede9 | 368 | static int data_block_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
369 | { |
370 | __le64 v1_le, v2_le; | |
371 | uint64_t b1, b2; | |
372 | uint32_t t; | |
373 | ||
374 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
375 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
376 | unpack_block_time(le64_to_cpu(v1_le), &b1, &t); | |
377 | unpack_block_time(le64_to_cpu(v2_le), &b2, &t); | |
378 | ||
379 | return b1 == b2; | |
380 | } | |
381 | ||
86a3238c | 382 | static void subtree_inc(void *context, const void *value, unsigned int count) |
991d9fa0 JT |
383 | { |
384 | struct dm_btree_info *info = context; | |
be500ed7 | 385 | const __le64 *root_le = value; |
86a3238c | 386 | unsigned int i; |
991d9fa0 | 387 | |
be500ed7 JT |
388 | for (i = 0; i < count; i++, root_le++) |
389 | dm_tm_inc(info->tm, le64_to_cpu(*root_le)); | |
991d9fa0 JT |
390 | } |
391 | ||
86a3238c | 392 | static void subtree_dec(void *context, const void *value, unsigned int count) |
991d9fa0 JT |
393 | { |
394 | struct dm_btree_info *info = context; | |
be500ed7 | 395 | const __le64 *root_le = value; |
86a3238c | 396 | unsigned int i; |
991d9fa0 | 397 | |
be500ed7 JT |
398 | for (i = 0; i < count; i++, root_le++) |
399 | if (dm_btree_del(info, le64_to_cpu(*root_le))) | |
400 | DMERR("btree delete failed"); | |
991d9fa0 JT |
401 | } |
402 | ||
018cede9 | 403 | static int subtree_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
404 | { |
405 | __le64 v1_le, v2_le; | |
0ef0b471 | 406 | |
991d9fa0 JT |
407 | memcpy(&v1_le, value1_le, sizeof(v1_le)); |
408 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
409 | ||
410 | return v1_le == v2_le; | |
411 | } | |
412 | ||
413 | /*----------------------------------------------------------------*/ | |
414 | ||
873f258b MS |
415 | /* |
416 | * Variant that is used for in-core only changes or code that | |
417 | * shouldn't put the pool in service on its own (e.g. commit). | |
418 | */ | |
44d8ebf4 | 419 | static inline void pmd_write_lock_in_core(struct dm_pool_metadata *pmd) |
6a1b1ddc MS |
420 | __acquires(pmd->root_lock) |
421 | { | |
422 | down_write(&pmd->root_lock); | |
423 | } | |
6a1b1ddc MS |
424 | |
425 | static inline void pmd_write_lock(struct dm_pool_metadata *pmd) | |
426 | { | |
44d8ebf4 | 427 | pmd_write_lock_in_core(pmd); |
873f258b MS |
428 | if (unlikely(!pmd->in_service)) |
429 | pmd->in_service = true; | |
6a1b1ddc MS |
430 | } |
431 | ||
432 | static inline void pmd_write_unlock(struct dm_pool_metadata *pmd) | |
433 | __releases(pmd->root_lock) | |
434 | { | |
435 | up_write(&pmd->root_lock); | |
436 | } | |
437 | ||
438 | /*----------------------------------------------------------------*/ | |
439 | ||
25971192 JT |
440 | static int superblock_lock_zero(struct dm_pool_metadata *pmd, |
441 | struct dm_block **sblock) | |
442 | { | |
443 | return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
444 | &sb_validator, sblock); | |
445 | } | |
446 | ||
447 | static int superblock_lock(struct dm_pool_metadata *pmd, | |
448 | struct dm_block **sblock) | |
449 | { | |
450 | return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
451 | &sb_validator, sblock); | |
452 | } | |
453 | ||
332627db | 454 | static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result) |
991d9fa0 JT |
455 | { |
456 | int r; | |
86a3238c | 457 | unsigned int i; |
991d9fa0 JT |
458 | struct dm_block *b; |
459 | __le64 *data_le, zero = cpu_to_le64(0); | |
86a3238c | 460 | unsigned int block_size = dm_bm_block_size(bm) / sizeof(__le64); |
991d9fa0 JT |
461 | |
462 | /* | |
463 | * We can't use a validator here - it may be all zeroes. | |
464 | */ | |
465 | r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b); | |
466 | if (r) | |
467 | return r; | |
468 | ||
469 | data_le = dm_block_data(b); | |
470 | *result = 1; | |
471 | for (i = 0; i < block_size; i++) { | |
472 | if (data_le[i] != zero) { | |
473 | *result = 0; | |
474 | break; | |
475 | } | |
476 | } | |
477 | ||
4c7da06f MP |
478 | dm_bm_unlock(b); |
479 | ||
480 | return 0; | |
991d9fa0 JT |
481 | } |
482 | ||
41675aea JT |
483 | static void __setup_btree_details(struct dm_pool_metadata *pmd) |
484 | { | |
485 | pmd->info.tm = pmd->tm; | |
486 | pmd->info.levels = 2; | |
487 | pmd->info.value_type.context = pmd->data_sm; | |
488 | pmd->info.value_type.size = sizeof(__le64); | |
489 | pmd->info.value_type.inc = data_block_inc; | |
490 | pmd->info.value_type.dec = data_block_dec; | |
491 | pmd->info.value_type.equal = data_block_equal; | |
492 | ||
493 | memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info)); | |
494 | pmd->nb_info.tm = pmd->nb_tm; | |
495 | ||
496 | pmd->tl_info.tm = pmd->tm; | |
497 | pmd->tl_info.levels = 1; | |
e3cbf945 | 498 | pmd->tl_info.value_type.context = &pmd->bl_info; |
41675aea JT |
499 | pmd->tl_info.value_type.size = sizeof(__le64); |
500 | pmd->tl_info.value_type.inc = subtree_inc; | |
501 | pmd->tl_info.value_type.dec = subtree_dec; | |
502 | pmd->tl_info.value_type.equal = subtree_equal; | |
503 | ||
504 | pmd->bl_info.tm = pmd->tm; | |
505 | pmd->bl_info.levels = 1; | |
506 | pmd->bl_info.value_type.context = pmd->data_sm; | |
507 | pmd->bl_info.value_type.size = sizeof(__le64); | |
508 | pmd->bl_info.value_type.inc = data_block_inc; | |
509 | pmd->bl_info.value_type.dec = data_block_dec; | |
510 | pmd->bl_info.value_type.equal = data_block_equal; | |
511 | ||
512 | pmd->details_info.tm = pmd->tm; | |
513 | pmd->details_info.levels = 1; | |
514 | pmd->details_info.value_type.context = NULL; | |
515 | pmd->details_info.value_type.size = sizeof(struct disk_device_details); | |
516 | pmd->details_info.value_type.inc = NULL; | |
517 | pmd->details_info.value_type.dec = NULL; | |
518 | pmd->details_info.value_type.equal = NULL; | |
519 | } | |
520 | ||
5a32083d JT |
521 | static int save_sm_roots(struct dm_pool_metadata *pmd) |
522 | { | |
523 | int r; | |
524 | size_t len; | |
525 | ||
526 | r = dm_sm_root_size(pmd->metadata_sm, &len); | |
527 | if (r < 0) | |
528 | return r; | |
529 | ||
530 | r = dm_sm_copy_root(pmd->metadata_sm, &pmd->metadata_space_map_root, len); | |
531 | if (r < 0) | |
532 | return r; | |
533 | ||
534 | r = dm_sm_root_size(pmd->data_sm, &len); | |
535 | if (r < 0) | |
536 | return r; | |
537 | ||
538 | return dm_sm_copy_root(pmd->data_sm, &pmd->data_space_map_root, len); | |
539 | } | |
540 | ||
541 | static void copy_sm_roots(struct dm_pool_metadata *pmd, | |
542 | struct thin_disk_superblock *disk) | |
543 | { | |
544 | memcpy(&disk->metadata_space_map_root, | |
545 | &pmd->metadata_space_map_root, | |
546 | sizeof(pmd->metadata_space_map_root)); | |
547 | ||
548 | memcpy(&disk->data_space_map_root, | |
549 | &pmd->data_space_map_root, | |
550 | sizeof(pmd->data_space_map_root)); | |
551 | } | |
552 | ||
9cb6653f JT |
553 | static int __write_initial_superblock(struct dm_pool_metadata *pmd) |
554 | { | |
555 | int r; | |
556 | struct dm_block *sblock; | |
557 | struct thin_disk_superblock *disk_super; | |
6dcbb52c | 558 | sector_t bdev_size = bdev_nr_sectors(pmd->bdev); |
9cb6653f JT |
559 | |
560 | if (bdev_size > THIN_METADATA_MAX_SECTORS) | |
561 | bdev_size = THIN_METADATA_MAX_SECTORS; | |
562 | ||
5a32083d | 563 | r = dm_sm_commit(pmd->data_sm); |
10d2a9ff JT |
564 | if (r < 0) |
565 | return r; | |
566 | ||
91bcdb92 | 567 | r = dm_tm_pre_commit(pmd->tm); |
10d2a9ff JT |
568 | if (r < 0) |
569 | return r; | |
570 | ||
91bcdb92 | 571 | r = save_sm_roots(pmd); |
10d2a9ff JT |
572 | if (r < 0) |
573 | return r; | |
574 | ||
9cb6653f JT |
575 | r = superblock_lock_zero(pmd, &sblock); |
576 | if (r) | |
577 | return r; | |
578 | ||
579 | disk_super = dm_block_data(sblock); | |
10d2a9ff | 580 | disk_super->flags = 0; |
583ceee2 | 581 | memset(disk_super->uuid, 0, sizeof(disk_super->uuid)); |
9cb6653f JT |
582 | disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC); |
583 | disk_super->version = cpu_to_le32(THIN_VERSION); | |
584 | disk_super->time = 0; | |
10d2a9ff JT |
585 | disk_super->trans_id = 0; |
586 | disk_super->held_root = 0; | |
587 | ||
5a32083d | 588 | copy_sm_roots(pmd, disk_super); |
10d2a9ff JT |
589 | |
590 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
591 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
7d48935e | 592 | disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE); |
9cb6653f JT |
593 | disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT); |
594 | disk_super->data_block_size = cpu_to_le32(pmd->data_block_size); | |
595 | ||
270938ba | 596 | return dm_tm_commit(pmd->tm, sblock); |
9cb6653f JT |
597 | } |
598 | ||
a97e5e6f | 599 | static int __format_metadata(struct dm_pool_metadata *pmd) |
991d9fa0 JT |
600 | { |
601 | int r; | |
384ef0e6 | 602 | |
e4d2205c JT |
603 | r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
604 | &pmd->tm, &pmd->metadata_sm); | |
605 | if (r < 0) { | |
606 | DMERR("tm_create_with_sm failed"); | |
607 | return r; | |
608 | } | |
991d9fa0 | 609 | |
a97e5e6f | 610 | pmd->data_sm = dm_sm_disk_create(pmd->tm, 0); |
e4d2205c JT |
611 | if (IS_ERR(pmd->data_sm)) { |
612 | DMERR("sm_disk_create failed"); | |
613 | r = PTR_ERR(pmd->data_sm); | |
0fa5b17b | 614 | goto bad_cleanup_tm; |
991d9fa0 JT |
615 | } |
616 | ||
d6332814 | 617 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
991d9fa0 | 618 | if (!pmd->nb_tm) { |
0fa5b17b | 619 | DMERR("could not create non-blocking clone tm"); |
991d9fa0 | 620 | r = -ENOMEM; |
0fa5b17b | 621 | goto bad_cleanup_data_sm; |
991d9fa0 JT |
622 | } |
623 | ||
41675aea | 624 | __setup_btree_details(pmd); |
991d9fa0 | 625 | |
9cb6653f JT |
626 | r = dm_btree_empty(&pmd->info, &pmd->root); |
627 | if (r < 0) | |
0fa5b17b | 628 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
629 | |
630 | r = dm_btree_empty(&pmd->details_info, &pmd->details_root); | |
631 | if (r < 0) { | |
632 | DMERR("couldn't create devices root"); | |
0fa5b17b | 633 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
634 | } |
635 | ||
636 | r = __write_initial_superblock(pmd); | |
637 | if (r) | |
0fa5b17b | 638 | goto bad_cleanup_nb_tm; |
9cb6653f | 639 | |
991d9fa0 JT |
640 | return 0; |
641 | ||
0fa5b17b JT |
642 | bad_cleanup_nb_tm: |
643 | dm_tm_destroy(pmd->nb_tm); | |
644 | bad_cleanup_data_sm: | |
d6332814 | 645 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 646 | bad_cleanup_tm: |
d6332814 JT |
647 | dm_tm_destroy(pmd->tm); |
648 | dm_sm_destroy(pmd->metadata_sm); | |
991d9fa0 JT |
649 | |
650 | return r; | |
651 | } | |
652 | ||
d73ec525 MS |
653 | static int __check_incompat_features(struct thin_disk_superblock *disk_super, |
654 | struct dm_pool_metadata *pmd) | |
655 | { | |
656 | uint32_t features; | |
657 | ||
658 | features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP; | |
659 | if (features) { | |
660 | DMERR("could not access metadata due to unsupported optional features (%lx).", | |
661 | (unsigned long)features); | |
662 | return -EINVAL; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Check for read-only metadata to skip the following RDWR checks. | |
667 | */ | |
1e0dcca9 | 668 | if (bdev_read_only(pmd->bdev)) |
d73ec525 MS |
669 | return 0; |
670 | ||
671 | features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP; | |
672 | if (features) { | |
673 | DMERR("could not access metadata RDWR due to unsupported optional features (%lx).", | |
674 | (unsigned long)features); | |
675 | return -EINVAL; | |
676 | } | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
e4d2205c JT |
681 | static int __open_metadata(struct dm_pool_metadata *pmd) |
682 | { | |
683 | int r; | |
684 | struct dm_block *sblock; | |
685 | struct thin_disk_superblock *disk_super; | |
686 | ||
687 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
688 | &sb_validator, &sblock); | |
689 | if (r < 0) { | |
690 | DMERR("couldn't read superblock"); | |
691 | return r; | |
692 | } | |
693 | ||
694 | disk_super = dm_block_data(sblock); | |
d73ec525 | 695 | |
9aec8629 MS |
696 | /* Verify the data block size hasn't changed */ |
697 | if (le32_to_cpu(disk_super->data_block_size) != pmd->data_block_size) { | |
698 | DMERR("changing the data block size (from %u to %llu) is not supported", | |
699 | le32_to_cpu(disk_super->data_block_size), | |
700 | (unsigned long long)pmd->data_block_size); | |
701 | r = -EINVAL; | |
702 | goto bad_unlock_sblock; | |
703 | } | |
704 | ||
d73ec525 | 705 | r = __check_incompat_features(disk_super, pmd); |
0fa5b17b JT |
706 | if (r < 0) |
707 | goto bad_unlock_sblock; | |
d73ec525 | 708 | |
e4d2205c JT |
709 | r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
710 | disk_super->metadata_space_map_root, | |
711 | sizeof(disk_super->metadata_space_map_root), | |
712 | &pmd->tm, &pmd->metadata_sm); | |
713 | if (r < 0) { | |
714 | DMERR("tm_open_with_sm failed"); | |
0fa5b17b | 715 | goto bad_unlock_sblock; |
e4d2205c JT |
716 | } |
717 | ||
718 | pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root, | |
719 | sizeof(disk_super->data_space_map_root)); | |
720 | if (IS_ERR(pmd->data_sm)) { | |
721 | DMERR("sm_disk_open failed"); | |
e4d2205c | 722 | r = PTR_ERR(pmd->data_sm); |
0fa5b17b | 723 | goto bad_cleanup_tm; |
e4d2205c JT |
724 | } |
725 | ||
e4d2205c JT |
726 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
727 | if (!pmd->nb_tm) { | |
0fa5b17b | 728 | DMERR("could not create non-blocking clone tm"); |
e4d2205c | 729 | r = -ENOMEM; |
0fa5b17b | 730 | goto bad_cleanup_data_sm; |
e4d2205c JT |
731 | } |
732 | ||
7991dbff ZC |
733 | /* |
734 | * For pool metadata opening process, root setting is redundant | |
735 | * because it will be set again in __begin_transaction(). But dm | |
736 | * pool aborting process really needs to get last transaction's | |
737 | * root to avoid accessing broken btree. | |
738 | */ | |
739 | pmd->root = le64_to_cpu(disk_super->data_mapping_root); | |
740 | pmd->details_root = le64_to_cpu(disk_super->device_details_root); | |
741 | ||
e4d2205c | 742 | __setup_btree_details(pmd); |
4c7da06f MP |
743 | dm_bm_unlock(sblock); |
744 | ||
745 | return 0; | |
e4d2205c | 746 | |
0fa5b17b | 747 | bad_cleanup_data_sm: |
e4d2205c | 748 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 749 | bad_cleanup_tm: |
e4d2205c JT |
750 | dm_tm_destroy(pmd->tm); |
751 | dm_sm_destroy(pmd->metadata_sm); | |
0fa5b17b JT |
752 | bad_unlock_sblock: |
753 | dm_bm_unlock(sblock); | |
e4d2205c JT |
754 | |
755 | return r; | |
756 | } | |
757 | ||
66b1edc0 | 758 | static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device) |
e4d2205c | 759 | { |
8801e069 | 760 | int r, unformatted; |
237074c0 | 761 | |
8801e069 | 762 | r = __superblock_all_zeroes(pmd->bm, &unformatted); |
237074c0 JT |
763 | if (r) |
764 | return r; | |
765 | ||
8801e069 | 766 | if (unformatted) |
66b1edc0 JT |
767 | return format_device ? __format_metadata(pmd) : -EPERM; |
768 | ||
769 | return __open_metadata(pmd); | |
e4d2205c JT |
770 | } |
771 | ||
66b1edc0 | 772 | static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device) |
332627db JT |
773 | { |
774 | int r; | |
775 | ||
7d48935e | 776 | pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT, |
332627db JT |
777 | THIN_MAX_CONCURRENT_LOCKS); |
778 | if (IS_ERR(pmd->bm)) { | |
779 | DMERR("could not create block manager"); | |
219403d7 YB |
780 | r = PTR_ERR(pmd->bm); |
781 | pmd->bm = NULL; | |
782 | return r; | |
332627db JT |
783 | } |
784 | ||
66b1edc0 | 785 | r = __open_or_format_metadata(pmd, format_device); |
219403d7 | 786 | if (r) { |
332627db | 787 | dm_block_manager_destroy(pmd->bm); |
219403d7 YB |
788 | pmd->bm = NULL; |
789 | } | |
332627db JT |
790 | |
791 | return r; | |
792 | } | |
793 | ||
8111964f ZC |
794 | static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd, |
795 | bool destroy_bm) | |
f9dd9352 JT |
796 | { |
797 | dm_sm_destroy(pmd->data_sm); | |
798 | dm_sm_destroy(pmd->metadata_sm); | |
799 | dm_tm_destroy(pmd->nb_tm); | |
800 | dm_tm_destroy(pmd->tm); | |
8111964f ZC |
801 | if (destroy_bm) |
802 | dm_block_manager_destroy(pmd->bm); | |
f9dd9352 JT |
803 | } |
804 | ||
991d9fa0 JT |
805 | static int __begin_transaction(struct dm_pool_metadata *pmd) |
806 | { | |
807 | int r; | |
991d9fa0 JT |
808 | struct thin_disk_superblock *disk_super; |
809 | struct dm_block *sblock; | |
810 | ||
991d9fa0 JT |
811 | /* |
812 | * We re-read the superblock every time. Shouldn't need to do this | |
813 | * really. | |
814 | */ | |
815 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
816 | &sb_validator, &sblock); | |
817 | if (r) | |
818 | return r; | |
819 | ||
820 | disk_super = dm_block_data(sblock); | |
821 | pmd->time = le32_to_cpu(disk_super->time); | |
822 | pmd->root = le64_to_cpu(disk_super->data_mapping_root); | |
823 | pmd->details_root = le64_to_cpu(disk_super->device_details_root); | |
824 | pmd->trans_id = le64_to_cpu(disk_super->trans_id); | |
825 | pmd->flags = le32_to_cpu(disk_super->flags); | |
826 | pmd->data_block_size = le32_to_cpu(disk_super->data_block_size); | |
827 | ||
991d9fa0 | 828 | dm_bm_unlock(sblock); |
d73ec525 | 829 | return 0; |
991d9fa0 JT |
830 | } |
831 | ||
832 | static int __write_changed_details(struct dm_pool_metadata *pmd) | |
833 | { | |
834 | int r; | |
835 | struct dm_thin_device *td, *tmp; | |
836 | struct disk_device_details details; | |
837 | uint64_t key; | |
838 | ||
839 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
840 | if (!td->changed) | |
841 | continue; | |
842 | ||
843 | key = td->id; | |
844 | ||
845 | details.mapped_blocks = cpu_to_le64(td->mapped_blocks); | |
846 | details.transaction_id = cpu_to_le64(td->transaction_id); | |
847 | details.creation_time = cpu_to_le32(td->creation_time); | |
848 | details.snapshotted_time = cpu_to_le32(td->snapshotted_time); | |
849 | __dm_bless_for_disk(&details); | |
850 | ||
851 | r = dm_btree_insert(&pmd->details_info, pmd->details_root, | |
852 | &key, &details, &pmd->details_root); | |
853 | if (r) | |
854 | return r; | |
855 | ||
856 | if (td->open_count) | |
63ee92d1 | 857 | td->changed = false; |
991d9fa0 JT |
858 | else { |
859 | list_del(&td->list); | |
860 | kfree(td); | |
861 | } | |
991d9fa0 JT |
862 | } |
863 | ||
864 | return 0; | |
865 | } | |
866 | ||
867 | static int __commit_transaction(struct dm_pool_metadata *pmd) | |
868 | { | |
991d9fa0 | 869 | int r; |
991d9fa0 JT |
870 | struct thin_disk_superblock *disk_super; |
871 | struct dm_block *sblock; | |
872 | ||
873 | /* | |
874 | * We need to know if the thin_disk_superblock exceeds a 512-byte sector. | |
875 | */ | |
876 | BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512); | |
44d8ebf4 | 877 | BUG_ON(!rwsem_is_locked(&pmd->root_lock)); |
991d9fa0 | 878 | |
873f258b MS |
879 | if (unlikely(!pmd->in_service)) |
880 | return 0; | |
881 | ||
ecda7c02 NT |
882 | if (pmd->pre_commit_fn) { |
883 | r = pmd->pre_commit_fn(pmd->pre_commit_context); | |
884 | if (r < 0) { | |
885 | DMERR("pre-commit callback failed"); | |
886 | return r; | |
887 | } | |
888 | } | |
889 | ||
991d9fa0 JT |
890 | r = __write_changed_details(pmd); |
891 | if (r < 0) | |
d973ac19 | 892 | return r; |
991d9fa0 | 893 | |
991d9fa0 JT |
894 | r = dm_sm_commit(pmd->data_sm); |
895 | if (r < 0) | |
d973ac19 | 896 | return r; |
991d9fa0 JT |
897 | |
898 | r = dm_tm_pre_commit(pmd->tm); | |
899 | if (r < 0) | |
d973ac19 | 900 | return r; |
991d9fa0 | 901 | |
5a32083d JT |
902 | r = save_sm_roots(pmd); |
903 | if (r < 0) | |
904 | return r; | |
905 | ||
25971192 | 906 | r = superblock_lock(pmd, &sblock); |
991d9fa0 | 907 | if (r) |
d973ac19 | 908 | return r; |
991d9fa0 JT |
909 | |
910 | disk_super = dm_block_data(sblock); | |
911 | disk_super->time = cpu_to_le32(pmd->time); | |
912 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
913 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
914 | disk_super->trans_id = cpu_to_le64(pmd->trans_id); | |
915 | disk_super->flags = cpu_to_le32(pmd->flags); | |
916 | ||
5a32083d | 917 | copy_sm_roots(pmd, disk_super); |
991d9fa0 | 918 | |
eb04cf63 | 919 | return dm_tm_commit(pmd->tm, sblock); |
991d9fa0 JT |
920 | } |
921 | ||
3ab91828 JT |
922 | static void __set_metadata_reserve(struct dm_pool_metadata *pmd) |
923 | { | |
924 | int r; | |
925 | dm_block_t total; | |
926 | dm_block_t max_blocks = 4096; /* 16M */ | |
927 | ||
928 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, &total); | |
929 | if (r) { | |
930 | DMERR("could not get size of metadata device"); | |
931 | pmd->metadata_reserve = max_blocks; | |
013ad043 MS |
932 | } else |
933 | pmd->metadata_reserve = min(max_blocks, div_u64(total, 10)); | |
3ab91828 JT |
934 | } |
935 | ||
991d9fa0 | 936 | struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, |
66b1edc0 JT |
937 | sector_t data_block_size, |
938 | bool format_device) | |
991d9fa0 JT |
939 | { |
940 | int r; | |
991d9fa0 | 941 | struct dm_pool_metadata *pmd; |
991d9fa0 JT |
942 | |
943 | pmd = kmalloc(sizeof(*pmd), GFP_KERNEL); | |
944 | if (!pmd) { | |
945 | DMERR("could not allocate metadata struct"); | |
946 | return ERR_PTR(-ENOMEM); | |
947 | } | |
948 | ||
6a0ebd31 JT |
949 | init_rwsem(&pmd->root_lock); |
950 | pmd->time = 0; | |
951 | INIT_LIST_HEAD(&pmd->thin_devices); | |
da105ed5 | 952 | pmd->fail_io = false; |
873f258b | 953 | pmd->in_service = false; |
332627db | 954 | pmd->bdev = bdev; |
9cb6653f | 955 | pmd->data_block_size = data_block_size; |
ecda7c02 NT |
956 | pmd->pre_commit_fn = NULL; |
957 | pmd->pre_commit_context = NULL; | |
991d9fa0 | 958 | |
66b1edc0 | 959 | r = __create_persistent_data_objects(pmd, format_device); |
991d9fa0 | 960 | if (r) { |
991d9fa0 JT |
961 | kfree(pmd); |
962 | return ERR_PTR(r); | |
963 | } | |
991d9fa0 | 964 | |
270938ba JT |
965 | r = __begin_transaction(pmd); |
966 | if (r < 0) { | |
967 | if (dm_pool_metadata_close(pmd) < 0) | |
968 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); | |
969 | return ERR_PTR(r); | |
991d9fa0 JT |
970 | } |
971 | ||
3ab91828 JT |
972 | __set_metadata_reserve(pmd); |
973 | ||
991d9fa0 | 974 | return pmd; |
991d9fa0 JT |
975 | } |
976 | ||
977 | int dm_pool_metadata_close(struct dm_pool_metadata *pmd) | |
978 | { | |
979 | int r; | |
86a3238c | 980 | unsigned int open_devices = 0; |
991d9fa0 JT |
981 | struct dm_thin_device *td, *tmp; |
982 | ||
983 | down_read(&pmd->root_lock); | |
984 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
985 | if (td->open_count) | |
986 | open_devices++; | |
987 | else { | |
988 | list_del(&td->list); | |
989 | kfree(td); | |
990 | } | |
991 | } | |
992 | up_read(&pmd->root_lock); | |
993 | ||
994 | if (open_devices) { | |
995 | DMERR("attempt to close pmd when %u device(s) are still open", | |
996 | open_devices); | |
997 | return -EBUSY; | |
998 | } | |
999 | ||
44d8ebf4 | 1000 | pmd_write_lock_in_core(pmd); |
3a653b20 | 1001 | if (!pmd->fail_io && !dm_bm_is_read_only(pmd->bm)) { |
12ba58af JT |
1002 | r = __commit_transaction(pmd); |
1003 | if (r < 0) | |
1004 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
1005 | __func__, r); | |
1006 | } | |
3918e066 | 1007 | pmd_write_unlock(pmd); |
da105ed5 | 1008 | if (!pmd->fail_io) |
8111964f | 1009 | __destroy_persistent_data_objects(pmd, true); |
991d9fa0 | 1010 | |
da105ed5 | 1011 | kfree(pmd); |
991d9fa0 JT |
1012 | return 0; |
1013 | } | |
1014 | ||
1f3db25d MS |
1015 | /* |
1016 | * __open_device: Returns @td corresponding to device with id @dev, | |
1017 | * creating it if @create is set and incrementing @td->open_count. | |
1018 | * On failure, @td is undefined. | |
1019 | */ | |
991d9fa0 JT |
1020 | static int __open_device(struct dm_pool_metadata *pmd, |
1021 | dm_thin_id dev, int create, | |
1022 | struct dm_thin_device **td) | |
1023 | { | |
1024 | int r, changed = 0; | |
1025 | struct dm_thin_device *td2; | |
1026 | uint64_t key = dev; | |
1027 | struct disk_device_details details_le; | |
1028 | ||
1029 | /* | |
1f3db25d | 1030 | * If the device is already open, return it. |
991d9fa0 JT |
1031 | */ |
1032 | list_for_each_entry(td2, &pmd->thin_devices, list) | |
1033 | if (td2->id == dev) { | |
1f3db25d MS |
1034 | /* |
1035 | * May not create an already-open device. | |
1036 | */ | |
1037 | if (create) | |
1038 | return -EEXIST; | |
1039 | ||
991d9fa0 JT |
1040 | td2->open_count++; |
1041 | *td = td2; | |
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | /* | |
1046 | * Check the device exists. | |
1047 | */ | |
1048 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
1049 | &key, &details_le); | |
1050 | if (r) { | |
1051 | if (r != -ENODATA || !create) | |
1052 | return r; | |
1053 | ||
1f3db25d MS |
1054 | /* |
1055 | * Create new device. | |
1056 | */ | |
991d9fa0 JT |
1057 | changed = 1; |
1058 | details_le.mapped_blocks = 0; | |
1059 | details_le.transaction_id = cpu_to_le64(pmd->trans_id); | |
1060 | details_le.creation_time = cpu_to_le32(pmd->time); | |
1061 | details_le.snapshotted_time = cpu_to_le32(pmd->time); | |
1062 | } | |
1063 | ||
1064 | *td = kmalloc(sizeof(**td), GFP_NOIO); | |
1065 | if (!*td) | |
1066 | return -ENOMEM; | |
1067 | ||
1068 | (*td)->pmd = pmd; | |
1069 | (*td)->id = dev; | |
1070 | (*td)->open_count = 1; | |
1071 | (*td)->changed = changed; | |
da105ed5 | 1072 | (*td)->aborted_with_changes = false; |
991d9fa0 JT |
1073 | (*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks); |
1074 | (*td)->transaction_id = le64_to_cpu(details_le.transaction_id); | |
1075 | (*td)->creation_time = le32_to_cpu(details_le.creation_time); | |
1076 | (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time); | |
1077 | ||
1078 | list_add(&(*td)->list, &pmd->thin_devices); | |
1079 | ||
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | static void __close_device(struct dm_thin_device *td) | |
1084 | { | |
1085 | --td->open_count; | |
1086 | } | |
1087 | ||
1088 | static int __create_thin(struct dm_pool_metadata *pmd, | |
1089 | dm_thin_id dev) | |
1090 | { | |
1091 | int r; | |
1092 | dm_block_t dev_root; | |
1093 | uint64_t key = dev; | |
991d9fa0 JT |
1094 | struct dm_thin_device *td; |
1095 | __le64 value; | |
1096 | ||
1097 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
399c9bdb | 1098 | &key, NULL); |
991d9fa0 JT |
1099 | if (!r) |
1100 | return -EEXIST; | |
1101 | ||
1102 | /* | |
1103 | * Create an empty btree for the mappings. | |
1104 | */ | |
1105 | r = dm_btree_empty(&pmd->bl_info, &dev_root); | |
1106 | if (r) | |
1107 | return r; | |
1108 | ||
1109 | /* | |
1110 | * Insert it into the main mapping tree. | |
1111 | */ | |
1112 | value = cpu_to_le64(dev_root); | |
1113 | __dm_bless_for_disk(&value); | |
1114 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1115 | if (r) { | |
1116 | dm_btree_del(&pmd->bl_info, dev_root); | |
1117 | return r; | |
1118 | } | |
1119 | ||
1120 | r = __open_device(pmd, dev, 1, &td); | |
1121 | if (r) { | |
991d9fa0 JT |
1122 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1123 | dm_btree_del(&pmd->bl_info, dev_root); | |
1124 | return r; | |
1125 | } | |
991d9fa0 JT |
1126 | __close_device(td); |
1127 | ||
1128 | return r; | |
1129 | } | |
1130 | ||
1131 | int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1132 | { | |
da105ed5 | 1133 | int r = -EINVAL; |
991d9fa0 | 1134 | |
6a1b1ddc | 1135 | pmd_write_lock(pmd); |
da105ed5 JT |
1136 | if (!pmd->fail_io) |
1137 | r = __create_thin(pmd, dev); | |
6a1b1ddc | 1138 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1139 | |
1140 | return r; | |
1141 | } | |
1142 | ||
1143 | static int __set_snapshot_details(struct dm_pool_metadata *pmd, | |
1144 | struct dm_thin_device *snap, | |
1145 | dm_thin_id origin, uint32_t time) | |
1146 | { | |
1147 | int r; | |
1148 | struct dm_thin_device *td; | |
1149 | ||
1150 | r = __open_device(pmd, origin, 0, &td); | |
1151 | if (r) | |
1152 | return r; | |
1153 | ||
63ee92d1 | 1154 | td->changed = true; |
991d9fa0 JT |
1155 | td->snapshotted_time = time; |
1156 | ||
1157 | snap->mapped_blocks = td->mapped_blocks; | |
1158 | snap->snapshotted_time = time; | |
1159 | __close_device(td); | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | static int __create_snap(struct dm_pool_metadata *pmd, | |
1165 | dm_thin_id dev, dm_thin_id origin) | |
1166 | { | |
1167 | int r; | |
1168 | dm_block_t origin_root; | |
1169 | uint64_t key = origin, dev_key = dev; | |
1170 | struct dm_thin_device *td; | |
991d9fa0 JT |
1171 | __le64 value; |
1172 | ||
1173 | /* check this device is unused */ | |
1174 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
399c9bdb | 1175 | &dev_key, NULL); |
991d9fa0 JT |
1176 | if (!r) |
1177 | return -EEXIST; | |
1178 | ||
1179 | /* find the mapping tree for the origin */ | |
1180 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value); | |
1181 | if (r) | |
1182 | return r; | |
1183 | origin_root = le64_to_cpu(value); | |
1184 | ||
1185 | /* clone the origin, an inc will do */ | |
1186 | dm_tm_inc(pmd->tm, origin_root); | |
1187 | ||
1188 | /* insert into the main mapping tree */ | |
1189 | value = cpu_to_le64(origin_root); | |
1190 | __dm_bless_for_disk(&value); | |
1191 | key = dev; | |
1192 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1193 | if (r) { | |
1194 | dm_tm_dec(pmd->tm, origin_root); | |
1195 | return r; | |
1196 | } | |
1197 | ||
1198 | pmd->time++; | |
1199 | ||
1200 | r = __open_device(pmd, dev, 1, &td); | |
1201 | if (r) | |
1202 | goto bad; | |
1203 | ||
1204 | r = __set_snapshot_details(pmd, td, origin, pmd->time); | |
1f3db25d MS |
1205 | __close_device(td); |
1206 | ||
991d9fa0 JT |
1207 | if (r) |
1208 | goto bad; | |
1209 | ||
991d9fa0 JT |
1210 | return 0; |
1211 | ||
1212 | bad: | |
991d9fa0 JT |
1213 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1214 | dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1215 | &key, &pmd->details_root); | |
1216 | return r; | |
1217 | } | |
1218 | ||
1219 | int dm_pool_create_snap(struct dm_pool_metadata *pmd, | |
1220 | dm_thin_id dev, | |
1221 | dm_thin_id origin) | |
1222 | { | |
da105ed5 | 1223 | int r = -EINVAL; |
991d9fa0 | 1224 | |
6a1b1ddc | 1225 | pmd_write_lock(pmd); |
da105ed5 JT |
1226 | if (!pmd->fail_io) |
1227 | r = __create_snap(pmd, dev, origin); | |
6a1b1ddc | 1228 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1229 | |
1230 | return r; | |
1231 | } | |
1232 | ||
1233 | static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1234 | { | |
1235 | int r; | |
1236 | uint64_t key = dev; | |
1237 | struct dm_thin_device *td; | |
1238 | ||
1239 | /* TODO: failure should mark the transaction invalid */ | |
1240 | r = __open_device(pmd, dev, 0, &td); | |
1241 | if (r) | |
1242 | return r; | |
1243 | ||
1244 | if (td->open_count > 1) { | |
1245 | __close_device(td); | |
1246 | return -EBUSY; | |
1247 | } | |
1248 | ||
1249 | list_del(&td->list); | |
1250 | kfree(td); | |
1251 | r = dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1252 | &key, &pmd->details_root); | |
1253 | if (r) | |
1254 | return r; | |
1255 | ||
1256 | r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); | |
1257 | if (r) | |
1258 | return r; | |
1259 | ||
991d9fa0 JT |
1260 | return 0; |
1261 | } | |
1262 | ||
1263 | int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, | |
1264 | dm_thin_id dev) | |
1265 | { | |
da105ed5 | 1266 | int r = -EINVAL; |
991d9fa0 | 1267 | |
6a1b1ddc | 1268 | pmd_write_lock(pmd); |
da105ed5 JT |
1269 | if (!pmd->fail_io) |
1270 | r = __delete_device(pmd, dev); | |
6a1b1ddc | 1271 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1272 | |
1273 | return r; | |
1274 | } | |
1275 | ||
1276 | int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1277 | uint64_t current_id, | |
1278 | uint64_t new_id) | |
1279 | { | |
da105ed5 JT |
1280 | int r = -EINVAL; |
1281 | ||
6a1b1ddc | 1282 | pmd_write_lock(pmd); |
da105ed5 JT |
1283 | |
1284 | if (pmd->fail_io) | |
1285 | goto out; | |
1286 | ||
991d9fa0 | 1287 | if (pmd->trans_id != current_id) { |
991d9fa0 | 1288 | DMERR("mismatched transaction id"); |
da105ed5 | 1289 | goto out; |
991d9fa0 JT |
1290 | } |
1291 | ||
1292 | pmd->trans_id = new_id; | |
da105ed5 JT |
1293 | r = 0; |
1294 | ||
1295 | out: | |
6a1b1ddc | 1296 | pmd_write_unlock(pmd); |
991d9fa0 | 1297 | |
da105ed5 | 1298 | return r; |
991d9fa0 JT |
1299 | } |
1300 | ||
1301 | int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1302 | uint64_t *result) | |
1303 | { | |
da105ed5 JT |
1304 | int r = -EINVAL; |
1305 | ||
991d9fa0 | 1306 | down_read(&pmd->root_lock); |
da105ed5 JT |
1307 | if (!pmd->fail_io) { |
1308 | *result = pmd->trans_id; | |
1309 | r = 0; | |
1310 | } | |
991d9fa0 JT |
1311 | up_read(&pmd->root_lock); |
1312 | ||
da105ed5 | 1313 | return r; |
991d9fa0 JT |
1314 | } |
1315 | ||
cc8394d8 JT |
1316 | static int __reserve_metadata_snap(struct dm_pool_metadata *pmd) |
1317 | { | |
1318 | int r, inc; | |
1319 | struct thin_disk_superblock *disk_super; | |
1320 | struct dm_block *copy, *sblock; | |
1321 | dm_block_t held_root; | |
1322 | ||
49e99fc7 JT |
1323 | /* |
1324 | * We commit to ensure the btree roots which we increment in a | |
1325 | * moment are up to date. | |
1326 | */ | |
a1ed4d9e MS |
1327 | r = __commit_transaction(pmd); |
1328 | if (r < 0) { | |
1329 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
1330 | __func__, r); | |
1331 | return r; | |
1332 | } | |
49e99fc7 | 1333 | |
cc8394d8 JT |
1334 | /* |
1335 | * Copy the superblock. | |
1336 | */ | |
1337 | dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION); | |
1338 | r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION, | |
1339 | &sb_validator, ©, &inc); | |
1340 | if (r) | |
1341 | return r; | |
1342 | ||
1343 | BUG_ON(!inc); | |
1344 | ||
1345 | held_root = dm_block_location(copy); | |
1346 | disk_super = dm_block_data(copy); | |
1347 | ||
1348 | if (le64_to_cpu(disk_super->held_root)) { | |
1349 | DMWARN("Pool metadata snapshot already exists: release this before taking another."); | |
1350 | ||
1351 | dm_tm_dec(pmd->tm, held_root); | |
1352 | dm_tm_unlock(pmd->tm, copy); | |
cc8394d8 JT |
1353 | return -EBUSY; |
1354 | } | |
1355 | ||
1356 | /* | |
1357 | * Wipe the spacemap since we're not publishing this. | |
1358 | */ | |
1359 | memset(&disk_super->data_space_map_root, 0, | |
1360 | sizeof(disk_super->data_space_map_root)); | |
1361 | memset(&disk_super->metadata_space_map_root, 0, | |
1362 | sizeof(disk_super->metadata_space_map_root)); | |
1363 | ||
1364 | /* | |
1365 | * Increment the data structures that need to be preserved. | |
1366 | */ | |
1367 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root)); | |
1368 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root)); | |
1369 | dm_tm_unlock(pmd->tm, copy); | |
1370 | ||
1371 | /* | |
1372 | * Write the held root into the superblock. | |
1373 | */ | |
25971192 | 1374 | r = superblock_lock(pmd, &sblock); |
cc8394d8 JT |
1375 | if (r) { |
1376 | dm_tm_dec(pmd->tm, held_root); | |
cc8394d8 JT |
1377 | return r; |
1378 | } | |
1379 | ||
1380 | disk_super = dm_block_data(sblock); | |
1381 | disk_super->held_root = cpu_to_le64(held_root); | |
1382 | dm_bm_unlock(sblock); | |
cc8394d8 JT |
1383 | return 0; |
1384 | } | |
1385 | ||
1386 | int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd) | |
1387 | { | |
da105ed5 | 1388 | int r = -EINVAL; |
cc8394d8 | 1389 | |
6a1b1ddc | 1390 | pmd_write_lock(pmd); |
da105ed5 JT |
1391 | if (!pmd->fail_io) |
1392 | r = __reserve_metadata_snap(pmd); | |
6a1b1ddc | 1393 | pmd_write_unlock(pmd); |
cc8394d8 JT |
1394 | |
1395 | return r; | |
1396 | } | |
1397 | ||
1398 | static int __release_metadata_snap(struct dm_pool_metadata *pmd) | |
991d9fa0 JT |
1399 | { |
1400 | int r; | |
1401 | struct thin_disk_superblock *disk_super; | |
cc8394d8 JT |
1402 | struct dm_block *sblock, *copy; |
1403 | dm_block_t held_root; | |
991d9fa0 | 1404 | |
25971192 | 1405 | r = superblock_lock(pmd, &sblock); |
991d9fa0 JT |
1406 | if (r) |
1407 | return r; | |
1408 | ||
cc8394d8 JT |
1409 | disk_super = dm_block_data(sblock); |
1410 | held_root = le64_to_cpu(disk_super->held_root); | |
1411 | disk_super->held_root = cpu_to_le64(0); | |
cc8394d8 JT |
1412 | |
1413 | dm_bm_unlock(sblock); | |
1414 | ||
1415 | if (!held_root) { | |
1416 | DMWARN("No pool metadata snapshot found: nothing to release."); | |
1417 | return -EINVAL; | |
1418 | } | |
1419 | ||
1420 | r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, ©); | |
1421 | if (r) | |
1422 | return r; | |
1423 | ||
1424 | disk_super = dm_block_data(copy); | |
7f518ad0 JT |
1425 | dm_btree_del(&pmd->info, le64_to_cpu(disk_super->data_mapping_root)); |
1426 | dm_btree_del(&pmd->details_info, le64_to_cpu(disk_super->device_details_root)); | |
cc8394d8 JT |
1427 | dm_sm_dec_block(pmd->metadata_sm, held_root); |
1428 | ||
4c7da06f MP |
1429 | dm_tm_unlock(pmd->tm, copy); |
1430 | ||
1431 | return 0; | |
cc8394d8 JT |
1432 | } |
1433 | ||
1434 | int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd) | |
1435 | { | |
da105ed5 | 1436 | int r = -EINVAL; |
cc8394d8 | 1437 | |
6a1b1ddc | 1438 | pmd_write_lock(pmd); |
da105ed5 JT |
1439 | if (!pmd->fail_io) |
1440 | r = __release_metadata_snap(pmd); | |
6a1b1ddc | 1441 | pmd_write_unlock(pmd); |
cc8394d8 JT |
1442 | |
1443 | return r; | |
1444 | } | |
1445 | ||
1446 | static int __get_metadata_snap(struct dm_pool_metadata *pmd, | |
1447 | dm_block_t *result) | |
1448 | { | |
1449 | int r; | |
1450 | struct thin_disk_superblock *disk_super; | |
1451 | struct dm_block *sblock; | |
1452 | ||
1453 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
1454 | &sb_validator, &sblock); | |
1455 | if (r) | |
1456 | return r; | |
1457 | ||
991d9fa0 JT |
1458 | disk_super = dm_block_data(sblock); |
1459 | *result = le64_to_cpu(disk_super->held_root); | |
1460 | ||
4c7da06f MP |
1461 | dm_bm_unlock(sblock); |
1462 | ||
1463 | return 0; | |
991d9fa0 JT |
1464 | } |
1465 | ||
cc8394d8 JT |
1466 | int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd, |
1467 | dm_block_t *result) | |
991d9fa0 | 1468 | { |
da105ed5 | 1469 | int r = -EINVAL; |
991d9fa0 JT |
1470 | |
1471 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1472 | if (!pmd->fail_io) |
1473 | r = __get_metadata_snap(pmd, result); | |
991d9fa0 JT |
1474 | up_read(&pmd->root_lock); |
1475 | ||
1476 | return r; | |
1477 | } | |
1478 | ||
1479 | int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, | |
1480 | struct dm_thin_device **td) | |
1481 | { | |
da105ed5 | 1482 | int r = -EINVAL; |
991d9fa0 | 1483 | |
6a1b1ddc | 1484 | pmd_write_lock_in_core(pmd); |
da105ed5 JT |
1485 | if (!pmd->fail_io) |
1486 | r = __open_device(pmd, dev, 0, td); | |
6a1b1ddc | 1487 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1488 | |
1489 | return r; | |
1490 | } | |
1491 | ||
1492 | int dm_pool_close_thin_device(struct dm_thin_device *td) | |
1493 | { | |
6a1b1ddc | 1494 | pmd_write_lock_in_core(td->pmd); |
991d9fa0 | 1495 | __close_device(td); |
6a1b1ddc | 1496 | pmd_write_unlock(td->pmd); |
991d9fa0 JT |
1497 | |
1498 | return 0; | |
1499 | } | |
1500 | ||
1501 | dm_thin_id dm_thin_dev_id(struct dm_thin_device *td) | |
1502 | { | |
1503 | return td->id; | |
1504 | } | |
1505 | ||
19fa1a67 JT |
1506 | /* |
1507 | * Check whether @time (of block creation) is older than @td's last snapshot. | |
1508 | * If so then the associated block is shared with the last snapshot device. | |
1509 | * Any block on a device created *after* the device last got snapshotted is | |
1510 | * necessarily not shared. | |
1511 | */ | |
17b7d63f | 1512 | static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time) |
991d9fa0 JT |
1513 | { |
1514 | return td->snapshotted_time > time; | |
1515 | } | |
1516 | ||
3d5f6733 JT |
1517 | static void unpack_lookup_result(struct dm_thin_device *td, __le64 value, |
1518 | struct dm_thin_lookup_result *result) | |
1519 | { | |
1520 | uint64_t block_time = 0; | |
1521 | dm_block_t exception_block; | |
1522 | uint32_t exception_time; | |
1523 | ||
1524 | block_time = le64_to_cpu(value); | |
1525 | unpack_block_time(block_time, &exception_block, &exception_time); | |
1526 | result->block = exception_block; | |
1527 | result->shared = __snapshotted_since(td, exception_time); | |
1528 | } | |
1529 | ||
086fbbbd JT |
1530 | static int __find_block(struct dm_thin_device *td, dm_block_t block, |
1531 | int can_issue_io, struct dm_thin_lookup_result *result) | |
991d9fa0 | 1532 | { |
e5cfc69a | 1533 | int r; |
991d9fa0 JT |
1534 | __le64 value; |
1535 | struct dm_pool_metadata *pmd = td->pmd; | |
1536 | dm_block_t keys[2] = { td->id, block }; | |
da105ed5 | 1537 | struct dm_btree_info *info; |
991d9fa0 | 1538 | |
2d0f25cb | 1539 | if (can_issue_io) |
e5cfc69a | 1540 | info = &pmd->info; |
2d0f25cb | 1541 | else |
e5cfc69a | 1542 | info = &pmd->nb_info; |
da105ed5 | 1543 | |
e5cfc69a | 1544 | r = dm_btree_lookup(info, pmd->root, keys, &value); |
3d5f6733 JT |
1545 | if (!r) |
1546 | unpack_lookup_result(td, value, result); | |
1547 | ||
3d5f6733 JT |
1548 | return r; |
1549 | } | |
1550 | ||
086fbbbd JT |
1551 | int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, |
1552 | int can_issue_io, struct dm_thin_lookup_result *result) | |
3d5f6733 JT |
1553 | { |
1554 | int r; | |
3d5f6733 | 1555 | struct dm_pool_metadata *pmd = td->pmd; |
3d5f6733 JT |
1556 | |
1557 | down_read(&pmd->root_lock); | |
1558 | if (pmd->fail_io) { | |
1559 | up_read(&pmd->root_lock); | |
1560 | return -EINVAL; | |
991d9fa0 JT |
1561 | } |
1562 | ||
086fbbbd JT |
1563 | r = __find_block(td, block, can_issue_io, result); |
1564 | ||
1565 | up_read(&pmd->root_lock); | |
1566 | return r; | |
1567 | } | |
1568 | ||
1569 | static int __find_next_mapped_block(struct dm_thin_device *td, dm_block_t block, | |
1570 | dm_block_t *vblock, | |
1571 | struct dm_thin_lookup_result *result) | |
1572 | { | |
1573 | int r; | |
1574 | __le64 value; | |
1575 | struct dm_pool_metadata *pmd = td->pmd; | |
1576 | dm_block_t keys[2] = { td->id, block }; | |
1577 | ||
3d5f6733 JT |
1578 | r = dm_btree_lookup_next(&pmd->info, pmd->root, keys, vblock, &value); |
1579 | if (!r) | |
1580 | unpack_lookup_result(td, value, result); | |
1581 | ||
991d9fa0 JT |
1582 | return r; |
1583 | } | |
1584 | ||
086fbbbd JT |
1585 | static int __find_mapped_range(struct dm_thin_device *td, |
1586 | dm_block_t begin, dm_block_t end, | |
1587 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1588 | dm_block_t *pool_begin, bool *maybe_shared) | |
a5d895a9 JT |
1589 | { |
1590 | int r; | |
1591 | dm_block_t pool_end; | |
1592 | struct dm_thin_lookup_result lookup; | |
1593 | ||
1594 | if (end < begin) | |
1595 | return -ENODATA; | |
1596 | ||
086fbbbd | 1597 | r = __find_next_mapped_block(td, begin, &begin, &lookup); |
3d5f6733 JT |
1598 | if (r) |
1599 | return r; | |
a5d895a9 | 1600 | |
3d5f6733 | 1601 | if (begin >= end) |
a5d895a9 JT |
1602 | return -ENODATA; |
1603 | ||
1604 | *thin_begin = begin; | |
1605 | *pool_begin = lookup.block; | |
1606 | *maybe_shared = lookup.shared; | |
1607 | ||
1608 | begin++; | |
1609 | pool_end = *pool_begin + 1; | |
1610 | while (begin != end) { | |
086fbbbd | 1611 | r = __find_block(td, begin, true, &lookup); |
a5d895a9 JT |
1612 | if (r) { |
1613 | if (r == -ENODATA) | |
1614 | break; | |
1c3fe2fa HM |
1615 | |
1616 | return r; | |
a5d895a9 JT |
1617 | } |
1618 | ||
1619 | if ((lookup.block != pool_end) || | |
1620 | (lookup.shared != *maybe_shared)) | |
1621 | break; | |
1622 | ||
1623 | pool_end++; | |
1624 | begin++; | |
1625 | } | |
1626 | ||
1627 | *thin_end = begin; | |
1628 | return 0; | |
1629 | } | |
1630 | ||
086fbbbd JT |
1631 | int dm_thin_find_mapped_range(struct dm_thin_device *td, |
1632 | dm_block_t begin, dm_block_t end, | |
1633 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1634 | dm_block_t *pool_begin, bool *maybe_shared) | |
1635 | { | |
1636 | int r = -EINVAL; | |
1637 | struct dm_pool_metadata *pmd = td->pmd; | |
1638 | ||
1639 | down_read(&pmd->root_lock); | |
1640 | if (!pmd->fail_io) { | |
1641 | r = __find_mapped_range(td, begin, end, thin_begin, thin_end, | |
1642 | pool_begin, maybe_shared); | |
1643 | } | |
1644 | up_read(&pmd->root_lock); | |
1645 | ||
1646 | return r; | |
1647 | } | |
1648 | ||
991d9fa0 JT |
1649 | static int __insert(struct dm_thin_device *td, dm_block_t block, |
1650 | dm_block_t data_block) | |
1651 | { | |
1652 | int r, inserted; | |
1653 | __le64 value; | |
1654 | struct dm_pool_metadata *pmd = td->pmd; | |
1655 | dm_block_t keys[2] = { td->id, block }; | |
1656 | ||
991d9fa0 JT |
1657 | value = cpu_to_le64(pack_block_time(data_block, pmd->time)); |
1658 | __dm_bless_for_disk(&value); | |
1659 | ||
1660 | r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value, | |
1661 | &pmd->root, &inserted); | |
1662 | if (r) | |
1663 | return r; | |
1664 | ||
63ee92d1 | 1665 | td->changed = true; |
40db5a53 | 1666 | if (inserted) |
991d9fa0 | 1667 | td->mapped_blocks++; |
991d9fa0 JT |
1668 | |
1669 | return 0; | |
1670 | } | |
1671 | ||
1672 | int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, | |
1673 | dm_block_t data_block) | |
1674 | { | |
da105ed5 | 1675 | int r = -EINVAL; |
991d9fa0 | 1676 | |
6a1b1ddc | 1677 | pmd_write_lock(td->pmd); |
da105ed5 JT |
1678 | if (!td->pmd->fail_io) |
1679 | r = __insert(td, block, data_block); | |
6a1b1ddc | 1680 | pmd_write_unlock(td->pmd); |
991d9fa0 JT |
1681 | |
1682 | return r; | |
1683 | } | |
1684 | ||
6550f075 JT |
1685 | static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end) |
1686 | { | |
1687 | int r; | |
86a3238c | 1688 | unsigned int count, total_count = 0; |
6550f075 JT |
1689 | struct dm_pool_metadata *pmd = td->pmd; |
1690 | dm_block_t keys[1] = { td->id }; | |
1691 | __le64 value; | |
1692 | dm_block_t mapping_root; | |
1693 | ||
1694 | /* | |
1695 | * Find the mapping tree | |
1696 | */ | |
1697 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value); | |
1698 | if (r) | |
1699 | return r; | |
1700 | ||
1701 | /* | |
1702 | * Remove from the mapping tree, taking care to inc the | |
1703 | * ref count so it doesn't get deleted. | |
1704 | */ | |
1705 | mapping_root = le64_to_cpu(value); | |
1706 | dm_tm_inc(pmd->tm, mapping_root); | |
1707 | r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root); | |
1708 | if (r) | |
1709 | return r; | |
1710 | ||
993ceab9 JT |
1711 | /* |
1712 | * Remove leaves stops at the first unmapped entry, so we have to | |
1713 | * loop round finding mapped ranges. | |
1714 | */ | |
1715 | while (begin < end) { | |
1716 | r = dm_btree_lookup_next(&pmd->bl_info, mapping_root, &begin, &begin, &value); | |
1717 | if (r == -ENODATA) | |
1718 | break; | |
1719 | ||
1720 | if (r) | |
1721 | return r; | |
1722 | ||
1723 | if (begin >= end) | |
1724 | break; | |
1725 | ||
1726 | r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count); | |
1727 | if (r) | |
1728 | return r; | |
1729 | ||
1730 | total_count += count; | |
1731 | } | |
6550f075 | 1732 | |
993ceab9 | 1733 | td->mapped_blocks -= total_count; |
63ee92d1 | 1734 | td->changed = true; |
6550f075 JT |
1735 | |
1736 | /* | |
1737 | * Reinsert the mapping tree. | |
1738 | */ | |
1739 | value = cpu_to_le64(mapping_root); | |
1740 | __dm_bless_for_disk(&value); | |
1741 | return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root); | |
1742 | } | |
1743 | ||
6550f075 JT |
1744 | int dm_thin_remove_range(struct dm_thin_device *td, |
1745 | dm_block_t begin, dm_block_t end) | |
1746 | { | |
1747 | int r = -EINVAL; | |
1748 | ||
6a1b1ddc | 1749 | pmd_write_lock(td->pmd); |
6550f075 JT |
1750 | if (!td->pmd->fail_io) |
1751 | r = __remove_range(td, begin, end); | |
6a1b1ddc | 1752 | pmd_write_unlock(td->pmd); |
6550f075 JT |
1753 | |
1754 | return r; | |
1755 | } | |
1756 | ||
d445bd9c | 1757 | int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) |
19fa1a67 JT |
1758 | { |
1759 | int r; | |
1760 | uint32_t ref_count; | |
1761 | ||
1762 | down_read(&pmd->root_lock); | |
1763 | r = dm_sm_get_count(pmd->data_sm, b, &ref_count); | |
1764 | if (!r) | |
d445bd9c | 1765 | *result = (ref_count > 1); |
19fa1a67 | 1766 | up_read(&pmd->root_lock); |
991d9fa0 JT |
1767 | |
1768 | return r; | |
1769 | } | |
1770 | ||
2a0fbffb JT |
1771 | int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) |
1772 | { | |
1773 | int r = 0; | |
1774 | ||
6a1b1ddc | 1775 | pmd_write_lock(pmd); |
be500ed7 | 1776 | r = dm_sm_inc_blocks(pmd->data_sm, b, e); |
6a1b1ddc | 1777 | pmd_write_unlock(pmd); |
2a0fbffb JT |
1778 | |
1779 | return r; | |
1780 | } | |
1781 | ||
1782 | int dm_pool_dec_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) | |
1783 | { | |
1784 | int r = 0; | |
1785 | ||
6a1b1ddc | 1786 | pmd_write_lock(pmd); |
be500ed7 | 1787 | r = dm_sm_dec_blocks(pmd->data_sm, b, e); |
6a1b1ddc | 1788 | pmd_write_unlock(pmd); |
2a0fbffb JT |
1789 | |
1790 | return r; | |
1791 | } | |
1792 | ||
40db5a53 JT |
1793 | bool dm_thin_changed_this_transaction(struct dm_thin_device *td) |
1794 | { | |
1795 | int r; | |
1796 | ||
1797 | down_read(&td->pmd->root_lock); | |
1798 | r = td->changed; | |
1799 | up_read(&td->pmd->root_lock); | |
1800 | ||
1801 | return r; | |
1802 | } | |
1803 | ||
4d1662a3 MS |
1804 | bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd) |
1805 | { | |
1806 | bool r = false; | |
1807 | struct dm_thin_device *td, *tmp; | |
1808 | ||
1809 | down_read(&pmd->root_lock); | |
1810 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
1811 | if (td->changed) { | |
1812 | r = td->changed; | |
1813 | break; | |
1814 | } | |
1815 | } | |
1816 | up_read(&pmd->root_lock); | |
1817 | ||
1818 | return r; | |
1819 | } | |
1820 | ||
da105ed5 JT |
1821 | bool dm_thin_aborted_changes(struct dm_thin_device *td) |
1822 | { | |
1823 | bool r; | |
1824 | ||
1825 | down_read(&td->pmd->root_lock); | |
1826 | r = td->aborted_with_changes; | |
1827 | up_read(&td->pmd->root_lock); | |
1828 | ||
1829 | return r; | |
1830 | } | |
1831 | ||
991d9fa0 JT |
1832 | int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result) |
1833 | { | |
da105ed5 | 1834 | int r = -EINVAL; |
991d9fa0 | 1835 | |
6a1b1ddc | 1836 | pmd_write_lock(pmd); |
da105ed5 JT |
1837 | if (!pmd->fail_io) |
1838 | r = dm_sm_new_block(pmd->data_sm, result); | |
6a1b1ddc | 1839 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1840 | |
1841 | return r; | |
1842 | } | |
1843 | ||
1844 | int dm_pool_commit_metadata(struct dm_pool_metadata *pmd) | |
1845 | { | |
da105ed5 | 1846 | int r = -EINVAL; |
991d9fa0 | 1847 | |
873f258b MS |
1848 | /* |
1849 | * Care is taken to not have commit be what | |
1850 | * triggers putting the thin-pool in-service. | |
1851 | */ | |
44d8ebf4 | 1852 | pmd_write_lock_in_core(pmd); |
da105ed5 JT |
1853 | if (pmd->fail_io) |
1854 | goto out; | |
991d9fa0 JT |
1855 | |
1856 | r = __commit_transaction(pmd); | |
873f258b | 1857 | if (r < 0) |
991d9fa0 JT |
1858 | goto out; |
1859 | ||
1860 | /* | |
1861 | * Open the next transaction. | |
1862 | */ | |
1863 | r = __begin_transaction(pmd); | |
1864 | out: | |
6a1b1ddc | 1865 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1866 | return r; |
1867 | } | |
1868 | ||
da105ed5 JT |
1869 | static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd) |
1870 | { | |
1871 | struct dm_thin_device *td; | |
1872 | ||
1873 | list_for_each_entry(td, &pmd->thin_devices, list) | |
1874 | td->aborted_with_changes = td->changed; | |
1875 | } | |
1876 | ||
1877 | int dm_pool_abort_metadata(struct dm_pool_metadata *pmd) | |
1878 | { | |
1879 | int r = -EINVAL; | |
8111964f ZC |
1880 | struct dm_block_manager *old_bm = NULL, *new_bm = NULL; |
1881 | ||
1882 | /* fail_io is double-checked with pmd->root_lock held below */ | |
1883 | if (unlikely(pmd->fail_io)) | |
1884 | return r; | |
1885 | ||
1886 | /* | |
1887 | * Replacement block manager (new_bm) is created and old_bm destroyed outside of | |
1888 | * pmd root_lock to avoid ABBA deadlock that would result (due to life-cycle of | |
1889 | * shrinker associated with the block manager's bufio client vs pmd root_lock). | |
1890 | * - must take shrinker_rwsem without holding pmd->root_lock | |
1891 | */ | |
1892 | new_bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT, | |
1893 | THIN_MAX_CONCURRENT_LOCKS); | |
da105ed5 | 1894 | |
6a1b1ddc | 1895 | pmd_write_lock(pmd); |
8111964f ZC |
1896 | if (pmd->fail_io) { |
1897 | pmd_write_unlock(pmd); | |
da105ed5 | 1898 | goto out; |
8111964f | 1899 | } |
da105ed5 JT |
1900 | |
1901 | __set_abort_with_changes_flags(pmd); | |
8111964f ZC |
1902 | __destroy_persistent_data_objects(pmd, false); |
1903 | old_bm = pmd->bm; | |
1904 | if (IS_ERR(new_bm)) { | |
1905 | DMERR("could not create block manager during abort"); | |
1906 | pmd->bm = NULL; | |
1907 | r = PTR_ERR(new_bm); | |
1908 | goto out_unlock; | |
1909 | } | |
1910 | ||
1911 | pmd->bm = new_bm; | |
1912 | r = __open_or_format_metadata(pmd, false); | |
1913 | if (r) { | |
1914 | pmd->bm = NULL; | |
1915 | goto out_unlock; | |
1916 | } | |
1917 | new_bm = NULL; | |
1918 | out_unlock: | |
da105ed5 JT |
1919 | if (r) |
1920 | pmd->fail_io = true; | |
6a1b1ddc | 1921 | pmd_write_unlock(pmd); |
8111964f ZC |
1922 | dm_block_manager_destroy(old_bm); |
1923 | out: | |
1924 | if (new_bm && !IS_ERR(new_bm)) | |
1925 | dm_block_manager_destroy(new_bm); | |
da105ed5 JT |
1926 | |
1927 | return r; | |
1928 | } | |
1929 | ||
991d9fa0 JT |
1930 | int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result) |
1931 | { | |
da105ed5 | 1932 | int r = -EINVAL; |
991d9fa0 JT |
1933 | |
1934 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1935 | if (!pmd->fail_io) |
1936 | r = dm_sm_get_nr_free(pmd->data_sm, result); | |
991d9fa0 JT |
1937 | up_read(&pmd->root_lock); |
1938 | ||
1939 | return r; | |
1940 | } | |
1941 | ||
1942 | int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, | |
1943 | dm_block_t *result) | |
1944 | { | |
da105ed5 | 1945 | int r = -EINVAL; |
991d9fa0 JT |
1946 | |
1947 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1948 | if (!pmd->fail_io) |
1949 | r = dm_sm_get_nr_free(pmd->metadata_sm, result); | |
3ab91828 JT |
1950 | |
1951 | if (!r) { | |
1952 | if (*result < pmd->metadata_reserve) | |
1953 | *result = 0; | |
1954 | else | |
1955 | *result -= pmd->metadata_reserve; | |
1956 | } | |
991d9fa0 JT |
1957 | up_read(&pmd->root_lock); |
1958 | ||
1959 | return r; | |
1960 | } | |
1961 | ||
1962 | int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, | |
1963 | dm_block_t *result) | |
1964 | { | |
da105ed5 | 1965 | int r = -EINVAL; |
991d9fa0 JT |
1966 | |
1967 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1968 | if (!pmd->fail_io) |
1969 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, result); | |
991d9fa0 JT |
1970 | up_read(&pmd->root_lock); |
1971 | ||
1972 | return r; | |
1973 | } | |
1974 | ||
991d9fa0 JT |
1975 | int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result) |
1976 | { | |
da105ed5 | 1977 | int r = -EINVAL; |
991d9fa0 JT |
1978 | |
1979 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1980 | if (!pmd->fail_io) |
1981 | r = dm_sm_get_nr_blocks(pmd->data_sm, result); | |
991d9fa0 JT |
1982 | up_read(&pmd->root_lock); |
1983 | ||
1984 | return r; | |
1985 | } | |
1986 | ||
1987 | int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result) | |
1988 | { | |
da105ed5 | 1989 | int r = -EINVAL; |
991d9fa0 JT |
1990 | struct dm_pool_metadata *pmd = td->pmd; |
1991 | ||
1992 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1993 | if (!pmd->fail_io) { |
1994 | *result = td->mapped_blocks; | |
1995 | r = 0; | |
1996 | } | |
991d9fa0 JT |
1997 | up_read(&pmd->root_lock); |
1998 | ||
da105ed5 | 1999 | return r; |
991d9fa0 JT |
2000 | } |
2001 | ||
2002 | static int __highest_block(struct dm_thin_device *td, dm_block_t *result) | |
2003 | { | |
2004 | int r; | |
2005 | __le64 value_le; | |
2006 | dm_block_t thin_root; | |
2007 | struct dm_pool_metadata *pmd = td->pmd; | |
2008 | ||
2009 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le); | |
2010 | if (r) | |
2011 | return r; | |
2012 | ||
2013 | thin_root = le64_to_cpu(value_le); | |
2014 | ||
2015 | return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result); | |
2016 | } | |
2017 | ||
2018 | int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, | |
2019 | dm_block_t *result) | |
2020 | { | |
da105ed5 | 2021 | int r = -EINVAL; |
991d9fa0 JT |
2022 | struct dm_pool_metadata *pmd = td->pmd; |
2023 | ||
2024 | down_read(&pmd->root_lock); | |
da105ed5 JT |
2025 | if (!pmd->fail_io) |
2026 | r = __highest_block(td, result); | |
991d9fa0 JT |
2027 | up_read(&pmd->root_lock); |
2028 | ||
2029 | return r; | |
2030 | } | |
2031 | ||
b17446df | 2032 | static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count) |
991d9fa0 JT |
2033 | { |
2034 | int r; | |
2035 | dm_block_t old_count; | |
2036 | ||
b17446df | 2037 | r = dm_sm_get_nr_blocks(sm, &old_count); |
991d9fa0 JT |
2038 | if (r) |
2039 | return r; | |
2040 | ||
2041 | if (new_count == old_count) | |
2042 | return 0; | |
2043 | ||
2044 | if (new_count < old_count) { | |
b17446df | 2045 | DMERR("cannot reduce size of space map"); |
991d9fa0 JT |
2046 | return -EINVAL; |
2047 | } | |
2048 | ||
b17446df | 2049 | return dm_sm_extend(sm, new_count - old_count); |
991d9fa0 JT |
2050 | } |
2051 | ||
2052 | int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) | |
2053 | { | |
da105ed5 | 2054 | int r = -EINVAL; |
991d9fa0 | 2055 | |
6a1b1ddc | 2056 | pmd_write_lock(pmd); |
da105ed5 | 2057 | if (!pmd->fail_io) |
b17446df | 2058 | r = __resize_space_map(pmd->data_sm, new_count); |
6a1b1ddc | 2059 | pmd_write_unlock(pmd); |
991d9fa0 JT |
2060 | |
2061 | return r; | |
2062 | } | |
12ba58af | 2063 | |
24347e95 JT |
2064 | int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) |
2065 | { | |
2066 | int r = -EINVAL; | |
2067 | ||
6a1b1ddc | 2068 | pmd_write_lock(pmd); |
3ab91828 | 2069 | if (!pmd->fail_io) { |
24347e95 | 2070 | r = __resize_space_map(pmd->metadata_sm, new_count); |
3ab91828 JT |
2071 | if (!r) |
2072 | __set_metadata_reserve(pmd); | |
2073 | } | |
6a1b1ddc | 2074 | pmd_write_unlock(pmd); |
24347e95 JT |
2075 | |
2076 | return r; | |
2077 | } | |
2078 | ||
12ba58af JT |
2079 | void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) |
2080 | { | |
6a1b1ddc | 2081 | pmd_write_lock_in_core(pmd); |
12ba58af | 2082 | dm_bm_set_read_only(pmd->bm); |
6a1b1ddc | 2083 | pmd_write_unlock(pmd); |
12ba58af | 2084 | } |
ac8c3f3d | 2085 | |
9b7aaa64 JT |
2086 | void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd) |
2087 | { | |
6a1b1ddc | 2088 | pmd_write_lock_in_core(pmd); |
9b7aaa64 | 2089 | dm_bm_set_read_write(pmd->bm); |
6a1b1ddc | 2090 | pmd_write_unlock(pmd); |
9b7aaa64 JT |
2091 | } |
2092 | ||
ac8c3f3d JT |
2093 | int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, |
2094 | dm_block_t threshold, | |
2095 | dm_sm_threshold_fn fn, | |
2096 | void *context) | |
2097 | { | |
3534e5a5 | 2098 | int r = -EINVAL; |
ac8c3f3d | 2099 | |
6a1b1ddc | 2100 | pmd_write_lock_in_core(pmd); |
3534e5a5 LM |
2101 | if (!pmd->fail_io) { |
2102 | r = dm_sm_register_threshold_callback(pmd->metadata_sm, | |
2103 | threshold, fn, context); | |
2104 | } | |
6a1b1ddc | 2105 | pmd_write_unlock(pmd); |
ac8c3f3d JT |
2106 | |
2107 | return r; | |
2108 | } | |
07f2b6e0 | 2109 | |
ecda7c02 NT |
2110 | void dm_pool_register_pre_commit_callback(struct dm_pool_metadata *pmd, |
2111 | dm_pool_pre_commit_fn fn, | |
2112 | void *context) | |
2113 | { | |
2114 | pmd_write_lock_in_core(pmd); | |
2115 | pmd->pre_commit_fn = fn; | |
2116 | pmd->pre_commit_context = context; | |
2117 | pmd_write_unlock(pmd); | |
2118 | } | |
2119 | ||
07f2b6e0 MS |
2120 | int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd) |
2121 | { | |
54fa16ee | 2122 | int r = -EINVAL; |
07f2b6e0 MS |
2123 | struct dm_block *sblock; |
2124 | struct thin_disk_superblock *disk_super; | |
2125 | ||
6a1b1ddc | 2126 | pmd_write_lock(pmd); |
54fa16ee MS |
2127 | if (pmd->fail_io) |
2128 | goto out; | |
2129 | ||
07f2b6e0 MS |
2130 | pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG; |
2131 | ||
2132 | r = superblock_lock(pmd, &sblock); | |
2133 | if (r) { | |
54fa16ee | 2134 | DMERR("couldn't lock superblock"); |
07f2b6e0 MS |
2135 | goto out; |
2136 | } | |
2137 | ||
2138 | disk_super = dm_block_data(sblock); | |
2139 | disk_super->flags = cpu_to_le32(pmd->flags); | |
2140 | ||
2141 | dm_bm_unlock(sblock); | |
2142 | out: | |
6a1b1ddc | 2143 | pmd_write_unlock(pmd); |
07f2b6e0 MS |
2144 | return r; |
2145 | } | |
2146 | ||
2147 | bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd) | |
2148 | { | |
2149 | bool needs_check; | |
2150 | ||
2151 | down_read(&pmd->root_lock); | |
2152 | needs_check = pmd->flags & THIN_METADATA_NEEDS_CHECK_FLAG; | |
2153 | up_read(&pmd->root_lock); | |
2154 | ||
2155 | return needs_check; | |
2156 | } | |
8a01a6af JT |
2157 | |
2158 | void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd) | |
2159 | { | |
2eae9e44 JT |
2160 | down_read(&pmd->root_lock); |
2161 | if (!pmd->fail_io) | |
2162 | dm_tm_issue_prefetches(pmd->tm); | |
2163 | up_read(&pmd->root_lock); | |
8a01a6af | 2164 | } |