Commit | Line | Data |
---|---|---|
c6b4fcba JT |
1 | /* |
2 | * Copyright (C) 2012 Red Hat, Inc. | |
3 | * | |
4 | * This file is released under the GPL. | |
5 | */ | |
6 | ||
7 | #include "dm-cache-metadata.h" | |
8 | ||
9 | #include "persistent-data/dm-array.h" | |
10 | #include "persistent-data/dm-bitset.h" | |
11 | #include "persistent-data/dm-space-map.h" | |
12 | #include "persistent-data/dm-space-map-disk.h" | |
13 | #include "persistent-data/dm-transaction-manager.h" | |
14 | ||
15 | #include <linux/device-mapper.h> | |
6bdd0796 | 16 | #include <linux/refcount.h> |
c6b4fcba JT |
17 | |
18 | /*----------------------------------------------------------------*/ | |
19 | ||
20 | #define DM_MSG_PREFIX "cache metadata" | |
21 | ||
22 | #define CACHE_SUPERBLOCK_MAGIC 06142003 | |
23 | #define CACHE_SUPERBLOCK_LOCATION 0 | |
53d49819 JT |
24 | |
25 | /* | |
26 | * defines a range of metadata versions that this module can handle. | |
27 | */ | |
28 | #define MIN_CACHE_VERSION 1 | |
629d0a8a | 29 | #define MAX_CACHE_VERSION 2 |
53d49819 | 30 | |
c6b4fcba JT |
31 | /* |
32 | * 3 for btree insert + | |
33 | * 2 for btree lookup used within space map | |
34 | */ | |
35 | #define CACHE_MAX_CONCURRENT_LOCKS 5 | |
36 | #define SPACE_MAP_ROOT_SIZE 128 | |
37 | ||
38 | enum superblock_flag_bits { | |
39 | /* for spotting crashes that would invalidate the dirty bitset */ | |
40 | CLEAN_SHUTDOWN, | |
028ae9f7 JT |
41 | /* metadata must be checked using the tools */ |
42 | NEEDS_CHECK, | |
c6b4fcba JT |
43 | }; |
44 | ||
45 | /* | |
46 | * Each mapping from cache block -> origin block carries a set of flags. | |
47 | */ | |
48 | enum mapping_bits { | |
49 | /* | |
50 | * A valid mapping. Because we're using an array we clear this | |
51 | * flag for an non existant mapping. | |
52 | */ | |
53 | M_VALID = 1, | |
54 | ||
55 | /* | |
56 | * The data on the cache is different from that on the origin. | |
629d0a8a | 57 | * This flag is only used by metadata format 1. |
c6b4fcba JT |
58 | */ |
59 | M_DIRTY = 2 | |
60 | }; | |
61 | ||
62 | struct cache_disk_superblock { | |
63 | __le32 csum; | |
64 | __le32 flags; | |
65 | __le64 blocknr; | |
66 | ||
67 | __u8 uuid[16]; | |
68 | __le64 magic; | |
69 | __le32 version; | |
70 | ||
71 | __u8 policy_name[CACHE_POLICY_NAME_SIZE]; | |
72 | __le32 policy_hint_size; | |
73 | ||
74 | __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
75 | __le64 mapping_root; | |
76 | __le64 hint_root; | |
77 | ||
78 | __le64 discard_root; | |
79 | __le64 discard_block_size; | |
80 | __le64 discard_nr_blocks; | |
81 | ||
82 | __le32 data_block_size; | |
83 | __le32 metadata_block_size; | |
84 | __le32 cache_blocks; | |
85 | ||
86 | __le32 compat_flags; | |
87 | __le32 compat_ro_flags; | |
88 | __le32 incompat_flags; | |
89 | ||
90 | __le32 read_hits; | |
91 | __le32 read_misses; | |
92 | __le32 write_hits; | |
93 | __le32 write_misses; | |
4e7f506f MS |
94 | |
95 | __le32 policy_version[CACHE_POLICY_VERSION_SIZE]; | |
629d0a8a JT |
96 | |
97 | /* | |
98 | * Metadata format 2 fields. | |
99 | */ | |
100 | __le64 dirty_root; | |
c6b4fcba JT |
101 | } __packed; |
102 | ||
103 | struct dm_cache_metadata { | |
6bdd0796 | 104 | refcount_t ref_count; |
9b1cc9f2 JT |
105 | struct list_head list; |
106 | ||
629d0a8a | 107 | unsigned version; |
c6b4fcba JT |
108 | struct block_device *bdev; |
109 | struct dm_block_manager *bm; | |
110 | struct dm_space_map *metadata_sm; | |
111 | struct dm_transaction_manager *tm; | |
112 | ||
113 | struct dm_array_info info; | |
114 | struct dm_array_info hint_info; | |
115 | struct dm_disk_bitset discard_info; | |
116 | ||
117 | struct rw_semaphore root_lock; | |
028ae9f7 | 118 | unsigned long flags; |
c6b4fcba JT |
119 | dm_block_t root; |
120 | dm_block_t hint_root; | |
121 | dm_block_t discard_root; | |
122 | ||
123 | sector_t discard_block_size; | |
1bad9bc4 | 124 | dm_dblock_t discard_nr_blocks; |
c6b4fcba JT |
125 | |
126 | sector_t data_block_size; | |
127 | dm_cblock_t cache_blocks; | |
128 | bool changed:1; | |
129 | bool clean_when_opened:1; | |
130 | ||
131 | char policy_name[CACHE_POLICY_NAME_SIZE]; | |
4e7f506f | 132 | unsigned policy_version[CACHE_POLICY_VERSION_SIZE]; |
c6b4fcba JT |
133 | size_t policy_hint_size; |
134 | struct dm_cache_statistics stats; | |
5a32083d JT |
135 | |
136 | /* | |
137 | * Reading the space map root can fail, so we read it into this | |
138 | * buffer before the superblock is locked and updated. | |
139 | */ | |
140 | __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
028ae9f7 JT |
141 | |
142 | /* | |
143 | * Set if a transaction has to be aborted but the attempt to roll | |
144 | * back to the previous (good) transaction failed. The only | |
145 | * metadata operation permissible in this state is the closing of | |
146 | * the device. | |
147 | */ | |
148 | bool fail_io:1; | |
f177940a | 149 | |
629d0a8a JT |
150 | /* |
151 | * Metadata format 2 fields. | |
152 | */ | |
153 | dm_block_t dirty_root; | |
154 | struct dm_disk_bitset dirty_info; | |
155 | ||
f177940a JT |
156 | /* |
157 | * These structures are used when loading metadata. They're too | |
158 | * big to put on the stack. | |
159 | */ | |
160 | struct dm_array_cursor mapping_cursor; | |
161 | struct dm_array_cursor hint_cursor; | |
629d0a8a | 162 | struct dm_bitset_cursor dirty_cursor; |
c6b4fcba JT |
163 | }; |
164 | ||
165 | /*------------------------------------------------------------------- | |
166 | * superblock validator | |
167 | *-----------------------------------------------------------------*/ | |
168 | ||
169 | #define SUPERBLOCK_CSUM_XOR 9031977 | |
170 | ||
171 | static void sb_prepare_for_write(struct dm_block_validator *v, | |
172 | struct dm_block *b, | |
173 | size_t sb_block_size) | |
174 | { | |
175 | struct cache_disk_superblock *disk_super = dm_block_data(b); | |
176 | ||
177 | disk_super->blocknr = cpu_to_le64(dm_block_location(b)); | |
178 | disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
179 | sb_block_size - sizeof(__le32), | |
180 | SUPERBLOCK_CSUM_XOR)); | |
181 | } | |
182 | ||
53d49819 JT |
183 | static int check_metadata_version(struct cache_disk_superblock *disk_super) |
184 | { | |
185 | uint32_t metadata_version = le32_to_cpu(disk_super->version); | |
629d0a8a | 186 | |
53d49819 JT |
187 | if (metadata_version < MIN_CACHE_VERSION || metadata_version > MAX_CACHE_VERSION) { |
188 | DMERR("Cache metadata version %u found, but only versions between %u and %u supported.", | |
189 | metadata_version, MIN_CACHE_VERSION, MAX_CACHE_VERSION); | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
c6b4fcba JT |
196 | static int sb_check(struct dm_block_validator *v, |
197 | struct dm_block *b, | |
198 | size_t sb_block_size) | |
199 | { | |
200 | struct cache_disk_superblock *disk_super = dm_block_data(b); | |
201 | __le32 csum_le; | |
202 | ||
203 | if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) { | |
204 | DMERR("sb_check failed: blocknr %llu: wanted %llu", | |
205 | le64_to_cpu(disk_super->blocknr), | |
206 | (unsigned long long)dm_block_location(b)); | |
207 | return -ENOTBLK; | |
208 | } | |
209 | ||
210 | if (le64_to_cpu(disk_super->magic) != CACHE_SUPERBLOCK_MAGIC) { | |
211 | DMERR("sb_check failed: magic %llu: wanted %llu", | |
212 | le64_to_cpu(disk_super->magic), | |
213 | (unsigned long long)CACHE_SUPERBLOCK_MAGIC); | |
214 | return -EILSEQ; | |
215 | } | |
216 | ||
217 | csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
218 | sb_block_size - sizeof(__le32), | |
219 | SUPERBLOCK_CSUM_XOR)); | |
220 | if (csum_le != disk_super->csum) { | |
221 | DMERR("sb_check failed: csum %u: wanted %u", | |
222 | le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum)); | |
223 | return -EILSEQ; | |
224 | } | |
225 | ||
53d49819 | 226 | return check_metadata_version(disk_super); |
c6b4fcba JT |
227 | } |
228 | ||
229 | static struct dm_block_validator sb_validator = { | |
230 | .name = "superblock", | |
231 | .prepare_for_write = sb_prepare_for_write, | |
232 | .check = sb_check | |
233 | }; | |
234 | ||
235 | /*----------------------------------------------------------------*/ | |
236 | ||
237 | static int superblock_read_lock(struct dm_cache_metadata *cmd, | |
238 | struct dm_block **sblock) | |
239 | { | |
240 | return dm_bm_read_lock(cmd->bm, CACHE_SUPERBLOCK_LOCATION, | |
241 | &sb_validator, sblock); | |
242 | } | |
243 | ||
244 | static int superblock_lock_zero(struct dm_cache_metadata *cmd, | |
245 | struct dm_block **sblock) | |
246 | { | |
247 | return dm_bm_write_lock_zero(cmd->bm, CACHE_SUPERBLOCK_LOCATION, | |
248 | &sb_validator, sblock); | |
249 | } | |
250 | ||
251 | static int superblock_lock(struct dm_cache_metadata *cmd, | |
252 | struct dm_block **sblock) | |
253 | { | |
254 | return dm_bm_write_lock(cmd->bm, CACHE_SUPERBLOCK_LOCATION, | |
255 | &sb_validator, sblock); | |
256 | } | |
257 | ||
258 | /*----------------------------------------------------------------*/ | |
259 | ||
dd8b0c20 | 260 | static int __superblock_all_zeroes(struct dm_block_manager *bm, bool *result) |
c6b4fcba JT |
261 | { |
262 | int r; | |
263 | unsigned i; | |
264 | struct dm_block *b; | |
265 | __le64 *data_le, zero = cpu_to_le64(0); | |
266 | unsigned sb_block_size = dm_bm_block_size(bm) / sizeof(__le64); | |
267 | ||
268 | /* | |
269 | * We can't use a validator here - it may be all zeroes. | |
270 | */ | |
271 | r = dm_bm_read_lock(bm, CACHE_SUPERBLOCK_LOCATION, NULL, &b); | |
272 | if (r) | |
273 | return r; | |
274 | ||
275 | data_le = dm_block_data(b); | |
dd8b0c20 | 276 | *result = true; |
c6b4fcba JT |
277 | for (i = 0; i < sb_block_size; i++) { |
278 | if (data_le[i] != zero) { | |
dd8b0c20 | 279 | *result = false; |
c6b4fcba JT |
280 | break; |
281 | } | |
282 | } | |
283 | ||
4c7da06f MP |
284 | dm_bm_unlock(b); |
285 | ||
286 | return 0; | |
c6b4fcba JT |
287 | } |
288 | ||
289 | static void __setup_mapping_info(struct dm_cache_metadata *cmd) | |
290 | { | |
291 | struct dm_btree_value_type vt; | |
292 | ||
293 | vt.context = NULL; | |
294 | vt.size = sizeof(__le64); | |
295 | vt.inc = NULL; | |
296 | vt.dec = NULL; | |
297 | vt.equal = NULL; | |
298 | dm_array_info_init(&cmd->info, cmd->tm, &vt); | |
299 | ||
300 | if (cmd->policy_hint_size) { | |
301 | vt.size = sizeof(__le32); | |
302 | dm_array_info_init(&cmd->hint_info, cmd->tm, &vt); | |
303 | } | |
304 | } | |
305 | ||
5a32083d JT |
306 | static int __save_sm_root(struct dm_cache_metadata *cmd) |
307 | { | |
308 | int r; | |
309 | size_t metadata_len; | |
310 | ||
311 | r = dm_sm_root_size(cmd->metadata_sm, &metadata_len); | |
312 | if (r < 0) | |
313 | return r; | |
314 | ||
315 | return dm_sm_copy_root(cmd->metadata_sm, &cmd->metadata_space_map_root, | |
316 | metadata_len); | |
317 | } | |
318 | ||
319 | static void __copy_sm_root(struct dm_cache_metadata *cmd, | |
320 | struct cache_disk_superblock *disk_super) | |
321 | { | |
322 | memcpy(&disk_super->metadata_space_map_root, | |
323 | &cmd->metadata_space_map_root, | |
324 | sizeof(cmd->metadata_space_map_root)); | |
325 | } | |
326 | ||
629d0a8a JT |
327 | static bool separate_dirty_bits(struct dm_cache_metadata *cmd) |
328 | { | |
329 | return cmd->version >= 2; | |
330 | } | |
331 | ||
c6b4fcba JT |
332 | static int __write_initial_superblock(struct dm_cache_metadata *cmd) |
333 | { | |
334 | int r; | |
335 | struct dm_block *sblock; | |
c6b4fcba JT |
336 | struct cache_disk_superblock *disk_super; |
337 | sector_t bdev_size = i_size_read(cmd->bdev->bd_inode) >> SECTOR_SHIFT; | |
338 | ||
339 | /* FIXME: see if we can lose the max sectors limit */ | |
340 | if (bdev_size > DM_CACHE_METADATA_MAX_SECTORS) | |
341 | bdev_size = DM_CACHE_METADATA_MAX_SECTORS; | |
342 | ||
5a32083d | 343 | r = dm_tm_pre_commit(cmd->tm); |
c6b4fcba JT |
344 | if (r < 0) |
345 | return r; | |
346 | ||
5a32083d JT |
347 | /* |
348 | * dm_sm_copy_root() can fail. So we need to do it before we start | |
349 | * updating the superblock. | |
350 | */ | |
351 | r = __save_sm_root(cmd); | |
352 | if (r) | |
c6b4fcba JT |
353 | return r; |
354 | ||
355 | r = superblock_lock_zero(cmd, &sblock); | |
356 | if (r) | |
357 | return r; | |
358 | ||
359 | disk_super = dm_block_data(sblock); | |
360 | disk_super->flags = 0; | |
361 | memset(disk_super->uuid, 0, sizeof(disk_super->uuid)); | |
362 | disk_super->magic = cpu_to_le64(CACHE_SUPERBLOCK_MAGIC); | |
629d0a8a | 363 | disk_super->version = cpu_to_le32(cmd->version); |
4e7f506f MS |
364 | memset(disk_super->policy_name, 0, sizeof(disk_super->policy_name)); |
365 | memset(disk_super->policy_version, 0, sizeof(disk_super->policy_version)); | |
fd2fa954 | 366 | disk_super->policy_hint_size = cpu_to_le32(0); |
c6b4fcba | 367 | |
5a32083d | 368 | __copy_sm_root(cmd, disk_super); |
c6b4fcba JT |
369 | |
370 | disk_super->mapping_root = cpu_to_le64(cmd->root); | |
371 | disk_super->hint_root = cpu_to_le64(cmd->hint_root); | |
372 | disk_super->discard_root = cpu_to_le64(cmd->discard_root); | |
373 | disk_super->discard_block_size = cpu_to_le64(cmd->discard_block_size); | |
1bad9bc4 | 374 | disk_super->discard_nr_blocks = cpu_to_le64(from_dblock(cmd->discard_nr_blocks)); |
895b47d7 | 375 | disk_super->metadata_block_size = cpu_to_le32(DM_CACHE_METADATA_BLOCK_SIZE); |
c6b4fcba JT |
376 | disk_super->data_block_size = cpu_to_le32(cmd->data_block_size); |
377 | disk_super->cache_blocks = cpu_to_le32(0); | |
c6b4fcba JT |
378 | |
379 | disk_super->read_hits = cpu_to_le32(0); | |
380 | disk_super->read_misses = cpu_to_le32(0); | |
381 | disk_super->write_hits = cpu_to_le32(0); | |
382 | disk_super->write_misses = cpu_to_le32(0); | |
383 | ||
629d0a8a JT |
384 | if (separate_dirty_bits(cmd)) |
385 | disk_super->dirty_root = cpu_to_le64(cmd->dirty_root); | |
386 | ||
c6b4fcba | 387 | return dm_tm_commit(cmd->tm, sblock); |
c6b4fcba JT |
388 | } |
389 | ||
390 | static int __format_metadata(struct dm_cache_metadata *cmd) | |
391 | { | |
392 | int r; | |
393 | ||
394 | r = dm_tm_create_with_sm(cmd->bm, CACHE_SUPERBLOCK_LOCATION, | |
395 | &cmd->tm, &cmd->metadata_sm); | |
396 | if (r < 0) { | |
397 | DMERR("tm_create_with_sm failed"); | |
398 | return r; | |
399 | } | |
400 | ||
401 | __setup_mapping_info(cmd); | |
402 | ||
403 | r = dm_array_empty(&cmd->info, &cmd->root); | |
404 | if (r < 0) | |
405 | goto bad; | |
406 | ||
629d0a8a JT |
407 | if (separate_dirty_bits(cmd)) { |
408 | dm_disk_bitset_init(cmd->tm, &cmd->dirty_info); | |
409 | r = dm_bitset_empty(&cmd->dirty_info, &cmd->dirty_root); | |
410 | if (r < 0) | |
411 | goto bad; | |
412 | } | |
413 | ||
c6b4fcba | 414 | dm_disk_bitset_init(cmd->tm, &cmd->discard_info); |
c6b4fcba JT |
415 | r = dm_bitset_empty(&cmd->discard_info, &cmd->discard_root); |
416 | if (r < 0) | |
417 | goto bad; | |
418 | ||
419 | cmd->discard_block_size = 0; | |
420 | cmd->discard_nr_blocks = 0; | |
421 | ||
422 | r = __write_initial_superblock(cmd); | |
423 | if (r) | |
424 | goto bad; | |
425 | ||
426 | cmd->clean_when_opened = true; | |
427 | return 0; | |
428 | ||
429 | bad: | |
430 | dm_tm_destroy(cmd->tm); | |
431 | dm_sm_destroy(cmd->metadata_sm); | |
432 | ||
433 | return r; | |
434 | } | |
435 | ||
436 | static int __check_incompat_features(struct cache_disk_superblock *disk_super, | |
437 | struct dm_cache_metadata *cmd) | |
438 | { | |
629d0a8a | 439 | uint32_t incompat_flags, features; |
c6b4fcba | 440 | |
629d0a8a JT |
441 | incompat_flags = le32_to_cpu(disk_super->incompat_flags); |
442 | features = incompat_flags & ~DM_CACHE_FEATURE_INCOMPAT_SUPP; | |
c6b4fcba JT |
443 | if (features) { |
444 | DMERR("could not access metadata due to unsupported optional features (%lx).", | |
445 | (unsigned long)features); | |
446 | return -EINVAL; | |
447 | } | |
448 | ||
449 | /* | |
450 | * Check for read-only metadata to skip the following RDWR checks. | |
451 | */ | |
452 | if (get_disk_ro(cmd->bdev->bd_disk)) | |
453 | return 0; | |
454 | ||
455 | features = le32_to_cpu(disk_super->compat_ro_flags) & ~DM_CACHE_FEATURE_COMPAT_RO_SUPP; | |
456 | if (features) { | |
457 | DMERR("could not access metadata RDWR due to unsupported optional features (%lx).", | |
458 | (unsigned long)features); | |
459 | return -EINVAL; | |
460 | } | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | static int __open_metadata(struct dm_cache_metadata *cmd) | |
466 | { | |
467 | int r; | |
468 | struct dm_block *sblock; | |
469 | struct cache_disk_superblock *disk_super; | |
470 | unsigned long sb_flags; | |
471 | ||
472 | r = superblock_read_lock(cmd, &sblock); | |
473 | if (r < 0) { | |
474 | DMERR("couldn't read lock superblock"); | |
475 | return r; | |
476 | } | |
477 | ||
478 | disk_super = dm_block_data(sblock); | |
479 | ||
048e5a07 MS |
480 | /* Verify the data block size hasn't changed */ |
481 | if (le32_to_cpu(disk_super->data_block_size) != cmd->data_block_size) { | |
482 | DMERR("changing the data block size (from %u to %llu) is not supported", | |
483 | le32_to_cpu(disk_super->data_block_size), | |
484 | (unsigned long long)cmd->data_block_size); | |
485 | r = -EINVAL; | |
486 | goto bad; | |
487 | } | |
488 | ||
c6b4fcba JT |
489 | r = __check_incompat_features(disk_super, cmd); |
490 | if (r < 0) | |
491 | goto bad; | |
492 | ||
493 | r = dm_tm_open_with_sm(cmd->bm, CACHE_SUPERBLOCK_LOCATION, | |
494 | disk_super->metadata_space_map_root, | |
495 | sizeof(disk_super->metadata_space_map_root), | |
496 | &cmd->tm, &cmd->metadata_sm); | |
497 | if (r < 0) { | |
498 | DMERR("tm_open_with_sm failed"); | |
499 | goto bad; | |
500 | } | |
501 | ||
502 | __setup_mapping_info(cmd); | |
629d0a8a | 503 | dm_disk_bitset_init(cmd->tm, &cmd->dirty_info); |
c6b4fcba JT |
504 | dm_disk_bitset_init(cmd->tm, &cmd->discard_info); |
505 | sb_flags = le32_to_cpu(disk_super->flags); | |
506 | cmd->clean_when_opened = test_bit(CLEAN_SHUTDOWN, &sb_flags); | |
4c7da06f MP |
507 | dm_bm_unlock(sblock); |
508 | ||
509 | return 0; | |
c6b4fcba JT |
510 | |
511 | bad: | |
512 | dm_bm_unlock(sblock); | |
513 | return r; | |
514 | } | |
515 | ||
516 | static int __open_or_format_metadata(struct dm_cache_metadata *cmd, | |
517 | bool format_device) | |
518 | { | |
dd8b0c20 JT |
519 | int r; |
520 | bool unformatted = false; | |
c6b4fcba JT |
521 | |
522 | r = __superblock_all_zeroes(cmd->bm, &unformatted); | |
523 | if (r) | |
524 | return r; | |
525 | ||
526 | if (unformatted) | |
527 | return format_device ? __format_metadata(cmd) : -EPERM; | |
528 | ||
529 | return __open_metadata(cmd); | |
530 | } | |
531 | ||
532 | static int __create_persistent_data_objects(struct dm_cache_metadata *cmd, | |
533 | bool may_format_device) | |
534 | { | |
535 | int r; | |
895b47d7 | 536 | cmd->bm = dm_block_manager_create(cmd->bdev, DM_CACHE_METADATA_BLOCK_SIZE << SECTOR_SHIFT, |
c6b4fcba JT |
537 | CACHE_MAX_CONCURRENT_LOCKS); |
538 | if (IS_ERR(cmd->bm)) { | |
539 | DMERR("could not create block manager"); | |
540 | return PTR_ERR(cmd->bm); | |
541 | } | |
542 | ||
543 | r = __open_or_format_metadata(cmd, may_format_device); | |
544 | if (r) | |
545 | dm_block_manager_destroy(cmd->bm); | |
546 | ||
547 | return r; | |
548 | } | |
549 | ||
550 | static void __destroy_persistent_data_objects(struct dm_cache_metadata *cmd) | |
551 | { | |
552 | dm_sm_destroy(cmd->metadata_sm); | |
553 | dm_tm_destroy(cmd->tm); | |
554 | dm_block_manager_destroy(cmd->bm); | |
555 | } | |
556 | ||
557 | typedef unsigned long (*flags_mutator)(unsigned long); | |
558 | ||
559 | static void update_flags(struct cache_disk_superblock *disk_super, | |
560 | flags_mutator mutator) | |
561 | { | |
562 | uint32_t sb_flags = mutator(le32_to_cpu(disk_super->flags)); | |
563 | disk_super->flags = cpu_to_le32(sb_flags); | |
564 | } | |
565 | ||
566 | static unsigned long set_clean_shutdown(unsigned long flags) | |
567 | { | |
568 | set_bit(CLEAN_SHUTDOWN, &flags); | |
569 | return flags; | |
570 | } | |
571 | ||
572 | static unsigned long clear_clean_shutdown(unsigned long flags) | |
573 | { | |
574 | clear_bit(CLEAN_SHUTDOWN, &flags); | |
575 | return flags; | |
576 | } | |
577 | ||
578 | static void read_superblock_fields(struct dm_cache_metadata *cmd, | |
579 | struct cache_disk_superblock *disk_super) | |
580 | { | |
629d0a8a | 581 | cmd->version = le32_to_cpu(disk_super->version); |
028ae9f7 | 582 | cmd->flags = le32_to_cpu(disk_super->flags); |
c6b4fcba JT |
583 | cmd->root = le64_to_cpu(disk_super->mapping_root); |
584 | cmd->hint_root = le64_to_cpu(disk_super->hint_root); | |
585 | cmd->discard_root = le64_to_cpu(disk_super->discard_root); | |
586 | cmd->discard_block_size = le64_to_cpu(disk_super->discard_block_size); | |
1bad9bc4 | 587 | cmd->discard_nr_blocks = to_dblock(le64_to_cpu(disk_super->discard_nr_blocks)); |
c6b4fcba JT |
588 | cmd->data_block_size = le32_to_cpu(disk_super->data_block_size); |
589 | cmd->cache_blocks = to_cblock(le32_to_cpu(disk_super->cache_blocks)); | |
590 | strncpy(cmd->policy_name, disk_super->policy_name, sizeof(cmd->policy_name)); | |
4e7f506f MS |
591 | cmd->policy_version[0] = le32_to_cpu(disk_super->policy_version[0]); |
592 | cmd->policy_version[1] = le32_to_cpu(disk_super->policy_version[1]); | |
593 | cmd->policy_version[2] = le32_to_cpu(disk_super->policy_version[2]); | |
c6b4fcba JT |
594 | cmd->policy_hint_size = le32_to_cpu(disk_super->policy_hint_size); |
595 | ||
596 | cmd->stats.read_hits = le32_to_cpu(disk_super->read_hits); | |
597 | cmd->stats.read_misses = le32_to_cpu(disk_super->read_misses); | |
598 | cmd->stats.write_hits = le32_to_cpu(disk_super->write_hits); | |
599 | cmd->stats.write_misses = le32_to_cpu(disk_super->write_misses); | |
600 | ||
629d0a8a JT |
601 | if (separate_dirty_bits(cmd)) |
602 | cmd->dirty_root = le64_to_cpu(disk_super->dirty_root); | |
603 | ||
c6b4fcba JT |
604 | cmd->changed = false; |
605 | } | |
606 | ||
607 | /* | |
608 | * The mutator updates the superblock flags. | |
609 | */ | |
610 | static int __begin_transaction_flags(struct dm_cache_metadata *cmd, | |
611 | flags_mutator mutator) | |
612 | { | |
613 | int r; | |
614 | struct cache_disk_superblock *disk_super; | |
615 | struct dm_block *sblock; | |
616 | ||
617 | r = superblock_lock(cmd, &sblock); | |
618 | if (r) | |
619 | return r; | |
620 | ||
621 | disk_super = dm_block_data(sblock); | |
622 | update_flags(disk_super, mutator); | |
623 | read_superblock_fields(cmd, disk_super); | |
a9d45396 | 624 | dm_bm_unlock(sblock); |
c6b4fcba | 625 | |
a9d45396 | 626 | return dm_bm_flush(cmd->bm); |
c6b4fcba JT |
627 | } |
628 | ||
629 | static int __begin_transaction(struct dm_cache_metadata *cmd) | |
630 | { | |
631 | int r; | |
632 | struct cache_disk_superblock *disk_super; | |
633 | struct dm_block *sblock; | |
634 | ||
635 | /* | |
636 | * We re-read the superblock every time. Shouldn't need to do this | |
637 | * really. | |
638 | */ | |
639 | r = superblock_read_lock(cmd, &sblock); | |
640 | if (r) | |
641 | return r; | |
642 | ||
643 | disk_super = dm_block_data(sblock); | |
644 | read_superblock_fields(cmd, disk_super); | |
645 | dm_bm_unlock(sblock); | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
650 | static int __commit_transaction(struct dm_cache_metadata *cmd, | |
651 | flags_mutator mutator) | |
652 | { | |
653 | int r; | |
c6b4fcba JT |
654 | struct cache_disk_superblock *disk_super; |
655 | struct dm_block *sblock; | |
656 | ||
657 | /* | |
658 | * We need to know if the cache_disk_superblock exceeds a 512-byte sector. | |
659 | */ | |
660 | BUILD_BUG_ON(sizeof(struct cache_disk_superblock) > 512); | |
661 | ||
629d0a8a JT |
662 | if (separate_dirty_bits(cmd)) { |
663 | r = dm_bitset_flush(&cmd->dirty_info, cmd->dirty_root, | |
664 | &cmd->dirty_root); | |
665 | if (r) | |
666 | return r; | |
667 | } | |
668 | ||
c6b4fcba JT |
669 | r = dm_bitset_flush(&cmd->discard_info, cmd->discard_root, |
670 | &cmd->discard_root); | |
671 | if (r) | |
672 | return r; | |
673 | ||
674 | r = dm_tm_pre_commit(cmd->tm); | |
675 | if (r < 0) | |
676 | return r; | |
677 | ||
5a32083d JT |
678 | r = __save_sm_root(cmd); |
679 | if (r) | |
c6b4fcba JT |
680 | return r; |
681 | ||
682 | r = superblock_lock(cmd, &sblock); | |
683 | if (r) | |
684 | return r; | |
685 | ||
686 | disk_super = dm_block_data(sblock); | |
687 | ||
3201ac45 | 688 | disk_super->flags = cpu_to_le32(cmd->flags); |
c6b4fcba JT |
689 | if (mutator) |
690 | update_flags(disk_super, mutator); | |
691 | ||
692 | disk_super->mapping_root = cpu_to_le64(cmd->root); | |
629d0a8a JT |
693 | if (separate_dirty_bits(cmd)) |
694 | disk_super->dirty_root = cpu_to_le64(cmd->dirty_root); | |
c6b4fcba JT |
695 | disk_super->hint_root = cpu_to_le64(cmd->hint_root); |
696 | disk_super->discard_root = cpu_to_le64(cmd->discard_root); | |
697 | disk_super->discard_block_size = cpu_to_le64(cmd->discard_block_size); | |
1bad9bc4 | 698 | disk_super->discard_nr_blocks = cpu_to_le64(from_dblock(cmd->discard_nr_blocks)); |
c6b4fcba JT |
699 | disk_super->cache_blocks = cpu_to_le32(from_cblock(cmd->cache_blocks)); |
700 | strncpy(disk_super->policy_name, cmd->policy_name, sizeof(disk_super->policy_name)); | |
4e7f506f MS |
701 | disk_super->policy_version[0] = cpu_to_le32(cmd->policy_version[0]); |
702 | disk_super->policy_version[1] = cpu_to_le32(cmd->policy_version[1]); | |
703 | disk_super->policy_version[2] = cpu_to_le32(cmd->policy_version[2]); | |
fd2fa954 | 704 | disk_super->policy_hint_size = cpu_to_le32(cmd->policy_hint_size); |
c6b4fcba JT |
705 | |
706 | disk_super->read_hits = cpu_to_le32(cmd->stats.read_hits); | |
707 | disk_super->read_misses = cpu_to_le32(cmd->stats.read_misses); | |
708 | disk_super->write_hits = cpu_to_le32(cmd->stats.write_hits); | |
709 | disk_super->write_misses = cpu_to_le32(cmd->stats.write_misses); | |
5a32083d | 710 | __copy_sm_root(cmd, disk_super); |
c6b4fcba JT |
711 | |
712 | return dm_tm_commit(cmd->tm, sblock); | |
713 | } | |
714 | ||
715 | /*----------------------------------------------------------------*/ | |
716 | ||
717 | /* | |
718 | * The mappings are held in a dm-array that has 64-bit values stored in | |
719 | * little-endian format. The index is the cblock, the high 48bits of the | |
720 | * value are the oblock and the low 16 bit the flags. | |
721 | */ | |
722 | #define FLAGS_MASK ((1 << 16) - 1) | |
723 | ||
724 | static __le64 pack_value(dm_oblock_t block, unsigned flags) | |
725 | { | |
726 | uint64_t value = from_oblock(block); | |
727 | value <<= 16; | |
728 | value = value | (flags & FLAGS_MASK); | |
729 | return cpu_to_le64(value); | |
730 | } | |
731 | ||
732 | static void unpack_value(__le64 value_le, dm_oblock_t *block, unsigned *flags) | |
733 | { | |
734 | uint64_t value = le64_to_cpu(value_le); | |
735 | uint64_t b = value >> 16; | |
736 | *block = to_oblock(b); | |
737 | *flags = value & FLAGS_MASK; | |
738 | } | |
739 | ||
740 | /*----------------------------------------------------------------*/ | |
741 | ||
9b1cc9f2 JT |
742 | static struct dm_cache_metadata *metadata_open(struct block_device *bdev, |
743 | sector_t data_block_size, | |
744 | bool may_format_device, | |
629d0a8a JT |
745 | size_t policy_hint_size, |
746 | unsigned metadata_version) | |
c6b4fcba JT |
747 | { |
748 | int r; | |
749 | struct dm_cache_metadata *cmd; | |
750 | ||
751 | cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); | |
752 | if (!cmd) { | |
753 | DMERR("could not allocate metadata struct"); | |
766a7888 | 754 | return ERR_PTR(-ENOMEM); |
c6b4fcba JT |
755 | } |
756 | ||
629d0a8a | 757 | cmd->version = metadata_version; |
6bdd0796 | 758 | refcount_set(&cmd->ref_count, 1); |
c6b4fcba JT |
759 | init_rwsem(&cmd->root_lock); |
760 | cmd->bdev = bdev; | |
761 | cmd->data_block_size = data_block_size; | |
762 | cmd->cache_blocks = 0; | |
763 | cmd->policy_hint_size = policy_hint_size; | |
764 | cmd->changed = true; | |
028ae9f7 | 765 | cmd->fail_io = false; |
c6b4fcba JT |
766 | |
767 | r = __create_persistent_data_objects(cmd, may_format_device); | |
768 | if (r) { | |
769 | kfree(cmd); | |
770 | return ERR_PTR(r); | |
771 | } | |
772 | ||
773 | r = __begin_transaction_flags(cmd, clear_clean_shutdown); | |
774 | if (r < 0) { | |
775 | dm_cache_metadata_close(cmd); | |
776 | return ERR_PTR(r); | |
777 | } | |
778 | ||
779 | return cmd; | |
780 | } | |
781 | ||
9b1cc9f2 JT |
782 | /* |
783 | * We keep a little list of ref counted metadata objects to prevent two | |
784 | * different target instances creating separate bufio instances. This is | |
785 | * an issue if a table is reloaded before the suspend. | |
786 | */ | |
787 | static DEFINE_MUTEX(table_lock); | |
788 | static LIST_HEAD(table); | |
789 | ||
790 | static struct dm_cache_metadata *lookup(struct block_device *bdev) | |
791 | { | |
792 | struct dm_cache_metadata *cmd; | |
793 | ||
794 | list_for_each_entry(cmd, &table, list) | |
795 | if (cmd->bdev == bdev) { | |
6bdd0796 | 796 | refcount_inc(&cmd->ref_count); |
9b1cc9f2 JT |
797 | return cmd; |
798 | } | |
799 | ||
800 | return NULL; | |
801 | } | |
802 | ||
803 | static struct dm_cache_metadata *lookup_or_open(struct block_device *bdev, | |
804 | sector_t data_block_size, | |
805 | bool may_format_device, | |
629d0a8a JT |
806 | size_t policy_hint_size, |
807 | unsigned metadata_version) | |
9b1cc9f2 JT |
808 | { |
809 | struct dm_cache_metadata *cmd, *cmd2; | |
810 | ||
811 | mutex_lock(&table_lock); | |
812 | cmd = lookup(bdev); | |
813 | mutex_unlock(&table_lock); | |
814 | ||
815 | if (cmd) | |
816 | return cmd; | |
817 | ||
629d0a8a JT |
818 | cmd = metadata_open(bdev, data_block_size, may_format_device, |
819 | policy_hint_size, metadata_version); | |
766a7888 | 820 | if (!IS_ERR(cmd)) { |
9b1cc9f2 JT |
821 | mutex_lock(&table_lock); |
822 | cmd2 = lookup(bdev); | |
823 | if (cmd2) { | |
824 | mutex_unlock(&table_lock); | |
825 | __destroy_persistent_data_objects(cmd); | |
826 | kfree(cmd); | |
827 | return cmd2; | |
828 | } | |
829 | list_add(&cmd->list, &table); | |
830 | mutex_unlock(&table_lock); | |
831 | } | |
832 | ||
833 | return cmd; | |
834 | } | |
835 | ||
836 | static bool same_params(struct dm_cache_metadata *cmd, sector_t data_block_size) | |
837 | { | |
838 | if (cmd->data_block_size != data_block_size) { | |
07d93882 | 839 | DMERR("data_block_size (%llu) different from that in metadata (%llu)", |
9b1cc9f2 JT |
840 | (unsigned long long) data_block_size, |
841 | (unsigned long long) cmd->data_block_size); | |
842 | return false; | |
843 | } | |
844 | ||
845 | return true; | |
846 | } | |
847 | ||
848 | struct dm_cache_metadata *dm_cache_metadata_open(struct block_device *bdev, | |
849 | sector_t data_block_size, | |
850 | bool may_format_device, | |
629d0a8a JT |
851 | size_t policy_hint_size, |
852 | unsigned metadata_version) | |
9b1cc9f2 | 853 | { |
629d0a8a JT |
854 | struct dm_cache_metadata *cmd = lookup_or_open(bdev, data_block_size, may_format_device, |
855 | policy_hint_size, metadata_version); | |
766a7888 JT |
856 | |
857 | if (!IS_ERR(cmd) && !same_params(cmd, data_block_size)) { | |
9b1cc9f2 | 858 | dm_cache_metadata_close(cmd); |
766a7888 | 859 | return ERR_PTR(-EINVAL); |
9b1cc9f2 JT |
860 | } |
861 | ||
862 | return cmd; | |
863 | } | |
864 | ||
c6b4fcba JT |
865 | void dm_cache_metadata_close(struct dm_cache_metadata *cmd) |
866 | { | |
6bdd0796 | 867 | if (refcount_dec_and_test(&cmd->ref_count)) { |
9b1cc9f2 JT |
868 | mutex_lock(&table_lock); |
869 | list_del(&cmd->list); | |
870 | mutex_unlock(&table_lock); | |
871 | ||
028ae9f7 JT |
872 | if (!cmd->fail_io) |
873 | __destroy_persistent_data_objects(cmd); | |
9b1cc9f2 JT |
874 | kfree(cmd); |
875 | } | |
c6b4fcba JT |
876 | } |
877 | ||
f494a9c6 JT |
878 | /* |
879 | * Checks that the given cache block is either unmapped or clean. | |
880 | */ | |
629d0a8a JT |
881 | static int block_clean_combined_dirty(struct dm_cache_metadata *cmd, dm_cblock_t b, |
882 | bool *result) | |
f494a9c6 JT |
883 | { |
884 | int r; | |
885 | __le64 value; | |
886 | dm_oblock_t ob; | |
887 | unsigned flags; | |
888 | ||
889 | r = dm_array_get_value(&cmd->info, cmd->root, from_cblock(b), &value); | |
629d0a8a | 890 | if (r) |
f494a9c6 | 891 | return r; |
f494a9c6 JT |
892 | |
893 | unpack_value(value, &ob, &flags); | |
894 | *result = !((flags & M_VALID) && (flags & M_DIRTY)); | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
629d0a8a JT |
899 | static int blocks_are_clean_combined_dirty(struct dm_cache_metadata *cmd, |
900 | dm_cblock_t begin, dm_cblock_t end, | |
901 | bool *result) | |
f494a9c6 JT |
902 | { |
903 | int r; | |
904 | *result = true; | |
905 | ||
906 | while (begin != end) { | |
629d0a8a JT |
907 | r = block_clean_combined_dirty(cmd, begin, result); |
908 | if (r) { | |
909 | DMERR("block_clean_combined_dirty failed"); | |
f494a9c6 | 910 | return r; |
629d0a8a | 911 | } |
f494a9c6 JT |
912 | |
913 | if (!*result) { | |
914 | DMERR("cache block %llu is dirty", | |
915 | (unsigned long long) from_cblock(begin)); | |
916 | return 0; | |
917 | } | |
918 | ||
919 | begin = to_cblock(from_cblock(begin) + 1); | |
920 | } | |
921 | ||
922 | return 0; | |
923 | } | |
924 | ||
629d0a8a JT |
925 | static int blocks_are_clean_separate_dirty(struct dm_cache_metadata *cmd, |
926 | dm_cblock_t begin, dm_cblock_t end, | |
927 | bool *result) | |
928 | { | |
929 | int r; | |
930 | bool dirty_flag; | |
931 | *result = true; | |
932 | ||
687cf441 MS |
933 | if (from_cblock(cmd->cache_blocks) == 0) |
934 | /* Nothing to do */ | |
935 | return 0; | |
936 | ||
7f1b2159 | 937 | r = dm_bitset_cursor_begin(&cmd->dirty_info, cmd->dirty_root, |
0d963b6e | 938 | from_cblock(cmd->cache_blocks), &cmd->dirty_cursor); |
7f1b2159 MS |
939 | if (r) { |
940 | DMERR("%s: dm_bitset_cursor_begin for dirty failed", __func__); | |
941 | return r; | |
942 | } | |
943 | ||
944 | r = dm_bitset_cursor_skip(&cmd->dirty_cursor, from_cblock(begin)); | |
945 | if (r) { | |
946 | DMERR("%s: dm_bitset_cursor_skip for dirty failed", __func__); | |
947 | dm_bitset_cursor_end(&cmd->dirty_cursor); | |
948 | return r; | |
949 | } | |
950 | ||
629d0a8a JT |
951 | while (begin != end) { |
952 | /* | |
953 | * We assume that unmapped blocks have their dirty bit | |
954 | * cleared. | |
955 | */ | |
7f1b2159 | 956 | dirty_flag = dm_bitset_cursor_get_value(&cmd->dirty_cursor); |
629d0a8a | 957 | if (dirty_flag) { |
7f1b2159 | 958 | DMERR("%s: cache block %llu is dirty", __func__, |
629d0a8a | 959 | (unsigned long long) from_cblock(begin)); |
7f1b2159 | 960 | dm_bitset_cursor_end(&cmd->dirty_cursor); |
629d0a8a JT |
961 | *result = false; |
962 | return 0; | |
963 | } | |
964 | ||
0d963b6e JT |
965 | begin = to_cblock(from_cblock(begin) + 1); |
966 | if (begin == end) | |
967 | break; | |
968 | ||
7f1b2159 MS |
969 | r = dm_bitset_cursor_next(&cmd->dirty_cursor); |
970 | if (r) { | |
971 | DMERR("%s: dm_bitset_cursor_next for dirty failed", __func__); | |
972 | dm_bitset_cursor_end(&cmd->dirty_cursor); | |
973 | return r; | |
974 | } | |
629d0a8a JT |
975 | } |
976 | ||
7f1b2159 MS |
977 | dm_bitset_cursor_end(&cmd->dirty_cursor); |
978 | ||
629d0a8a JT |
979 | return 0; |
980 | } | |
981 | ||
982 | static int blocks_are_unmapped_or_clean(struct dm_cache_metadata *cmd, | |
983 | dm_cblock_t begin, dm_cblock_t end, | |
984 | bool *result) | |
985 | { | |
986 | if (separate_dirty_bits(cmd)) | |
987 | return blocks_are_clean_separate_dirty(cmd, begin, end, result); | |
988 | else | |
989 | return blocks_are_clean_combined_dirty(cmd, begin, end, result); | |
990 | } | |
991 | ||
9567366f MS |
992 | static bool cmd_write_lock(struct dm_cache_metadata *cmd) |
993 | { | |
994 | down_write(&cmd->root_lock); | |
995 | if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) { | |
996 | up_write(&cmd->root_lock); | |
997 | return false; | |
d14fcf3d | 998 | } |
9567366f MS |
999 | return true; |
1000 | } | |
028ae9f7 | 1001 | |
9567366f MS |
1002 | #define WRITE_LOCK(cmd) \ |
1003 | do { \ | |
1004 | if (!cmd_write_lock((cmd))) \ | |
1005 | return -EINVAL; \ | |
1006 | } while(0) | |
1007 | ||
1008 | #define WRITE_LOCK_VOID(cmd) \ | |
1009 | do { \ | |
1010 | if (!cmd_write_lock((cmd))) \ | |
1011 | return; \ | |
1012 | } while(0) | |
028ae9f7 JT |
1013 | |
1014 | #define WRITE_UNLOCK(cmd) \ | |
9567366f | 1015 | up_write(&(cmd)->root_lock) |
028ae9f7 | 1016 | |
9567366f MS |
1017 | static bool cmd_read_lock(struct dm_cache_metadata *cmd) |
1018 | { | |
6545b60b | 1019 | down_read(&cmd->root_lock); |
9567366f | 1020 | if (cmd->fail_io) { |
6545b60b | 1021 | up_read(&cmd->root_lock); |
9567366f | 1022 | return false; |
d14fcf3d | 1023 | } |
9567366f MS |
1024 | return true; |
1025 | } | |
d14fcf3d | 1026 | |
9567366f MS |
1027 | #define READ_LOCK(cmd) \ |
1028 | do { \ | |
1029 | if (!cmd_read_lock((cmd))) \ | |
1030 | return -EINVAL; \ | |
1031 | } while(0) | |
1032 | ||
1033 | #define READ_LOCK_VOID(cmd) \ | |
1034 | do { \ | |
1035 | if (!cmd_read_lock((cmd))) \ | |
1036 | return; \ | |
1037 | } while(0) | |
d14fcf3d JT |
1038 | |
1039 | #define READ_UNLOCK(cmd) \ | |
9567366f | 1040 | up_read(&(cmd)->root_lock) |
d14fcf3d | 1041 | |
c6b4fcba JT |
1042 | int dm_cache_resize(struct dm_cache_metadata *cmd, dm_cblock_t new_cache_size) |
1043 | { | |
1044 | int r; | |
f494a9c6 | 1045 | bool clean; |
c6b4fcba JT |
1046 | __le64 null_mapping = pack_value(0, 0); |
1047 | ||
028ae9f7 | 1048 | WRITE_LOCK(cmd); |
c6b4fcba | 1049 | __dm_bless_for_disk(&null_mapping); |
f494a9c6 JT |
1050 | |
1051 | if (from_cblock(new_cache_size) < from_cblock(cmd->cache_blocks)) { | |
1052 | r = blocks_are_unmapped_or_clean(cmd, new_cache_size, cmd->cache_blocks, &clean); | |
1053 | if (r) { | |
1054 | __dm_unbless_for_disk(&null_mapping); | |
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | if (!clean) { | |
1059 | DMERR("unable to shrink cache due to dirty blocks"); | |
1060 | r = -EINVAL; | |
1061 | __dm_unbless_for_disk(&null_mapping); | |
1062 | goto out; | |
1063 | } | |
1064 | } | |
1065 | ||
c6b4fcba JT |
1066 | r = dm_array_resize(&cmd->info, cmd->root, from_cblock(cmd->cache_blocks), |
1067 | from_cblock(new_cache_size), | |
1068 | &null_mapping, &cmd->root); | |
629d0a8a JT |
1069 | if (r) |
1070 | goto out; | |
1071 | ||
1072 | if (separate_dirty_bits(cmd)) { | |
1073 | r = dm_bitset_resize(&cmd->dirty_info, cmd->dirty_root, | |
1074 | from_cblock(cmd->cache_blocks), from_cblock(new_cache_size), | |
1075 | false, &cmd->dirty_root); | |
1076 | if (r) | |
1077 | goto out; | |
1078 | } | |
1079 | ||
1080 | cmd->cache_blocks = new_cache_size; | |
c6b4fcba | 1081 | cmd->changed = true; |
f494a9c6 JT |
1082 | |
1083 | out: | |
028ae9f7 | 1084 | WRITE_UNLOCK(cmd); |
c6b4fcba JT |
1085 | |
1086 | return r; | |
1087 | } | |
1088 | ||
1089 | int dm_cache_discard_bitset_resize(struct dm_cache_metadata *cmd, | |
1090 | sector_t discard_block_size, | |
1bad9bc4 | 1091 | dm_dblock_t new_nr_entries) |
c6b4fcba JT |
1092 | { |
1093 | int r; | |
1094 | ||
028ae9f7 | 1095 | WRITE_LOCK(cmd); |
c6b4fcba JT |
1096 | r = dm_bitset_resize(&cmd->discard_info, |
1097 | cmd->discard_root, | |
1bad9bc4 JT |
1098 | from_dblock(cmd->discard_nr_blocks), |
1099 | from_dblock(new_nr_entries), | |
c6b4fcba JT |
1100 | false, &cmd->discard_root); |
1101 | if (!r) { | |
1102 | cmd->discard_block_size = discard_block_size; | |
1103 | cmd->discard_nr_blocks = new_nr_entries; | |
1104 | } | |
1105 | ||
1106 | cmd->changed = true; | |
028ae9f7 | 1107 | WRITE_UNLOCK(cmd); |
c6b4fcba JT |
1108 | |
1109 | return r; | |
1110 | } | |
1111 | ||
1bad9bc4 | 1112 | static int __set_discard(struct dm_cache_metadata *cmd, dm_dblock_t b) |
c6b4fcba JT |
1113 | { |
1114 | return dm_bitset_set_bit(&cmd->discard_info, cmd->discard_root, | |
1bad9bc4 | 1115 | from_dblock(b), &cmd->discard_root); |
c6b4fcba JT |
1116 | } |
1117 | ||
1bad9bc4 | 1118 | static int __clear_discard(struct dm_cache_metadata *cmd, dm_dblock_t b) |
c6b4fcba JT |
1119 | { |
1120 | return dm_bitset_clear_bit(&cmd->discard_info, cmd->discard_root, | |
1bad9bc4 | 1121 | from_dblock(b), &cmd->discard_root); |
c6b4fcba JT |
1122 | } |
1123 | ||
c6b4fcba | 1124 | static int __discard(struct dm_cache_metadata *cmd, |
1bad9bc4 | 1125 | dm_dblock_t dblock, bool discard) |
c6b4fcba JT |
1126 | { |
1127 | int r; | |
1128 | ||
1129 | r = (discard ? __set_discard : __clear_discard)(cmd, dblock); | |
1130 | if (r) | |
1131 | return r; | |
1132 | ||
1133 | cmd->changed = true; | |
1134 | return 0; | |
1135 | } | |
1136 | ||
1137 | int dm_cache_set_discard(struct dm_cache_metadata *cmd, | |
1bad9bc4 | 1138 | dm_dblock_t dblock, bool discard) |
c6b4fcba JT |
1139 | { |
1140 | int r; | |
1141 | ||
028ae9f7 | 1142 | WRITE_LOCK(cmd); |
c6b4fcba | 1143 | r = __discard(cmd, dblock, discard); |
028ae9f7 | 1144 | WRITE_UNLOCK(cmd); |
c6b4fcba JT |
1145 | |
1146 | return r; | |
1147 | } | |
1148 | ||
1149 | static int __load_discards(struct dm_cache_metadata *cmd, | |
1150 | load_discard_fn fn, void *context) | |
1151 | { | |
1152 | int r = 0; | |
ae4a46a1 JT |
1153 | uint32_t b; |
1154 | struct dm_bitset_cursor c; | |
c6b4fcba | 1155 | |
ae4a46a1 JT |
1156 | if (from_dblock(cmd->discard_nr_blocks) == 0) |
1157 | /* nothing to do */ | |
1158 | return 0; | |
c6b4fcba | 1159 | |
ae4a46a1 JT |
1160 | if (cmd->clean_when_opened) { |
1161 | r = dm_bitset_flush(&cmd->discard_info, cmd->discard_root, &cmd->discard_root); | |
1162 | if (r) | |
1163 | return r; | |
c6b4fcba | 1164 | |
ae4a46a1 JT |
1165 | r = dm_bitset_cursor_begin(&cmd->discard_info, cmd->discard_root, |
1166 | from_dblock(cmd->discard_nr_blocks), &c); | |
c6b4fcba | 1167 | if (r) |
ae4a46a1 JT |
1168 | return r; |
1169 | ||
e28adc3b | 1170 | for (b = 0; ; b++) { |
ae4a46a1 JT |
1171 | r = fn(context, cmd->discard_block_size, to_dblock(b), |
1172 | dm_bitset_cursor_get_value(&c)); | |
1173 | if (r) | |
1174 | break; | |
e28adc3b NT |
1175 | |
1176 | if (b >= (from_dblock(cmd->discard_nr_blocks) - 1)) | |
1177 | break; | |
1178 | ||
1179 | r = dm_bitset_cursor_next(&c); | |
1180 | if (r) | |
1181 | break; | |
ae4a46a1 JT |
1182 | } |
1183 | ||
1184 | dm_bitset_cursor_end(&c); | |
1185 | ||
1186 | } else { | |
1187 | for (b = 0; b < from_dblock(cmd->discard_nr_blocks); b++) { | |
1188 | r = fn(context, cmd->discard_block_size, to_dblock(b), false); | |
1189 | if (r) | |
1190 | return r; | |
1191 | } | |
c6b4fcba JT |
1192 | } |
1193 | ||
1194 | return r; | |
1195 | } | |
1196 | ||
1197 | int dm_cache_load_discards(struct dm_cache_metadata *cmd, | |
1198 | load_discard_fn fn, void *context) | |
1199 | { | |
1200 | int r; | |
1201 | ||
d14fcf3d | 1202 | READ_LOCK(cmd); |
c6b4fcba | 1203 | r = __load_discards(cmd, fn, context); |
d14fcf3d | 1204 | READ_UNLOCK(cmd); |
c6b4fcba JT |
1205 | |
1206 | return r; | |
1207 | } | |
1208 | ||
d14fcf3d | 1209 | int dm_cache_size(struct dm_cache_metadata *cmd, dm_cblock_t *result) |
c6b4fcba | 1210 | { |
d14fcf3d JT |
1211 | READ_LOCK(cmd); |
1212 | *result = cmd->cache_blocks; | |
1213 | READ_UNLOCK(cmd); | |
c6b4fcba | 1214 | |
d14fcf3d | 1215 | return 0; |
c6b4fcba JT |
1216 | } |
1217 | ||
1218 | static int __remove(struct dm_cache_metadata *cmd, dm_cblock_t cblock) | |
1219 | { | |
1220 | int r; | |
1221 | __le64 value = pack_value(0, 0); | |
1222 | ||
1223 | __dm_bless_for_disk(&value); | |
1224 | r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock), | |
1225 | &value, &cmd->root); | |
1226 | if (r) | |
1227 | return r; | |
1228 | ||
1229 | cmd->changed = true; | |
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | int dm_cache_remove_mapping(struct dm_cache_metadata *cmd, dm_cblock_t cblock) | |
1234 | { | |
1235 | int r; | |
1236 | ||
028ae9f7 | 1237 | WRITE_LOCK(cmd); |
c6b4fcba | 1238 | r = __remove(cmd, cblock); |
028ae9f7 | 1239 | WRITE_UNLOCK(cmd); |
c6b4fcba JT |
1240 | |
1241 | return r; | |
1242 | } | |
1243 | ||
1244 | static int __insert(struct dm_cache_metadata *cmd, | |
1245 | dm_cblock_t cblock, dm_oblock_t oblock) | |
1246 | { | |
1247 | int r; | |
1248 | __le64 value = pack_value(oblock, M_VALID); | |
1249 | __dm_bless_for_disk(&value); | |
1250 | ||
1251 | r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock), | |
1252 | &value, &cmd->root); | |
1253 | if (r) | |
1254 | return r; | |
1255 | ||
1256 | cmd->changed = true; | |
1257 | return 0; | |
1258 | } | |
1259 | ||
1260 | int dm_cache_insert_mapping(struct dm_cache_metadata *cmd, | |
1261 | dm_cblock_t cblock, dm_oblock_t oblock) | |
1262 | { | |
1263 | int r; | |
1264 | ||
028ae9f7 | 1265 | WRITE_LOCK(cmd); |
c6b4fcba | 1266 | r = __insert(cmd, cblock, oblock); |
028ae9f7 | 1267 | WRITE_UNLOCK(cmd); |
c6b4fcba JT |
1268 | |
1269 | return r; | |
1270 | } | |
1271 | ||
1272 | struct thunk { | |
1273 | load_mapping_fn fn; | |
1274 | void *context; | |
1275 | ||
1276 | struct dm_cache_metadata *cmd; | |
1277 | bool respect_dirty_flags; | |
1278 | bool hints_valid; | |
1279 | }; | |
1280 | ||
ea2dd8c1 MS |
1281 | static bool policy_unchanged(struct dm_cache_metadata *cmd, |
1282 | struct dm_cache_policy *policy) | |
1283 | { | |
1284 | const char *policy_name = dm_cache_policy_get_name(policy); | |
1285 | const unsigned *policy_version = dm_cache_policy_get_version(policy); | |
1286 | size_t policy_hint_size = dm_cache_policy_get_hint_size(policy); | |
1287 | ||
1288 | /* | |
1289 | * Ensure policy names match. | |
1290 | */ | |
1291 | if (strncmp(cmd->policy_name, policy_name, sizeof(cmd->policy_name))) | |
1292 | return false; | |
1293 | ||
1294 | /* | |
1295 | * Ensure policy major versions match. | |
1296 | */ | |
1297 | if (cmd->policy_version[0] != policy_version[0]) | |
1298 | return false; | |
1299 | ||
1300 | /* | |
1301 | * Ensure policy hint sizes match. | |
1302 | */ | |
1303 | if (cmd->policy_hint_size != policy_hint_size) | |
1304 | return false; | |
1305 | ||
1306 | return true; | |
1307 | } | |
1308 | ||
c6b4fcba JT |
1309 | static bool hints_array_initialized(struct dm_cache_metadata *cmd) |
1310 | { | |
1311 | return cmd->hint_root && cmd->policy_hint_size; | |
1312 | } | |
1313 | ||
1314 | static bool hints_array_available(struct dm_cache_metadata *cmd, | |
ea2dd8c1 | 1315 | struct dm_cache_policy *policy) |
c6b4fcba | 1316 | { |
ea2dd8c1 | 1317 | return cmd->clean_when_opened && policy_unchanged(cmd, policy) && |
c6b4fcba JT |
1318 | hints_array_initialized(cmd); |
1319 | } | |
1320 | ||
629d0a8a JT |
1321 | static int __load_mapping_v1(struct dm_cache_metadata *cmd, |
1322 | uint64_t cb, bool hints_valid, | |
1323 | struct dm_array_cursor *mapping_cursor, | |
1324 | struct dm_array_cursor *hint_cursor, | |
1325 | load_mapping_fn fn, void *context) | |
c6b4fcba JT |
1326 | { |
1327 | int r = 0; | |
f177940a JT |
1328 | |
1329 | __le64 mapping; | |
1330 | __le32 hint = 0; | |
1331 | ||
1332 | __le64 *mapping_value_le; | |
1333 | __le32 *hint_value_le; | |
1334 | ||
c6b4fcba JT |
1335 | dm_oblock_t oblock; |
1336 | unsigned flags; | |
5b1fe7be | 1337 | bool dirty = true; |
c6b4fcba | 1338 | |
f177940a JT |
1339 | dm_array_cursor_get_value(mapping_cursor, (void **) &mapping_value_le); |
1340 | memcpy(&mapping, mapping_value_le, sizeof(mapping)); | |
1341 | unpack_value(mapping, &oblock, &flags); | |
c6b4fcba JT |
1342 | |
1343 | if (flags & M_VALID) { | |
f177940a JT |
1344 | if (hints_valid) { |
1345 | dm_array_cursor_get_value(hint_cursor, (void **) &hint_value_le); | |
1346 | memcpy(&hint, hint_value_le, sizeof(hint)); | |
c6b4fcba | 1347 | } |
5b1fe7be ID |
1348 | if (cmd->clean_when_opened) |
1349 | dirty = flags & M_DIRTY; | |
c6b4fcba | 1350 | |
5b1fe7be | 1351 | r = fn(context, oblock, to_cblock(cb), dirty, |
f177940a | 1352 | le32_to_cpu(hint), hints_valid); |
48551054 MS |
1353 | if (r) { |
1354 | DMERR("policy couldn't load cache block %llu", | |
1355 | (unsigned long long) from_cblock(to_cblock(cb))); | |
1356 | } | |
c6b4fcba JT |
1357 | } |
1358 | ||
1359 | return r; | |
1360 | } | |
1361 | ||
629d0a8a JT |
1362 | static int __load_mapping_v2(struct dm_cache_metadata *cmd, |
1363 | uint64_t cb, bool hints_valid, | |
1364 | struct dm_array_cursor *mapping_cursor, | |
1365 | struct dm_array_cursor *hint_cursor, | |
1366 | struct dm_bitset_cursor *dirty_cursor, | |
1367 | load_mapping_fn fn, void *context) | |
1368 | { | |
1369 | int r = 0; | |
1370 | ||
1371 | __le64 mapping; | |
1372 | __le32 hint = 0; | |
1373 | ||
1374 | __le64 *mapping_value_le; | |
1375 | __le32 *hint_value_le; | |
1376 | ||
1377 | dm_oblock_t oblock; | |
1378 | unsigned flags; | |
5b1fe7be | 1379 | bool dirty = true; |
629d0a8a JT |
1380 | |
1381 | dm_array_cursor_get_value(mapping_cursor, (void **) &mapping_value_le); | |
1382 | memcpy(&mapping, mapping_value_le, sizeof(mapping)); | |
1383 | unpack_value(mapping, &oblock, &flags); | |
1384 | ||
1385 | if (flags & M_VALID) { | |
1386 | if (hints_valid) { | |
1387 | dm_array_cursor_get_value(hint_cursor, (void **) &hint_value_le); | |
1388 | memcpy(&hint, hint_value_le, sizeof(hint)); | |
1389 | } | |
5b1fe7be ID |
1390 | if (cmd->clean_when_opened) |
1391 | dirty = dm_bitset_cursor_get_value(dirty_cursor); | |
629d0a8a | 1392 | |
629d0a8a JT |
1393 | r = fn(context, oblock, to_cblock(cb), dirty, |
1394 | le32_to_cpu(hint), hints_valid); | |
48551054 MS |
1395 | if (r) { |
1396 | DMERR("policy couldn't load cache block %llu", | |
1397 | (unsigned long long) from_cblock(to_cblock(cb))); | |
1398 | } | |
629d0a8a JT |
1399 | } |
1400 | ||
1401 | return r; | |
1402 | } | |
1403 | ||
ea2dd8c1 MS |
1404 | static int __load_mappings(struct dm_cache_metadata *cmd, |
1405 | struct dm_cache_policy *policy, | |
c6b4fcba JT |
1406 | load_mapping_fn fn, void *context) |
1407 | { | |
f177940a JT |
1408 | int r; |
1409 | uint64_t cb; | |
c6b4fcba | 1410 | |
f177940a | 1411 | bool hints_valid = hints_array_available(cmd, policy); |
c6b4fcba | 1412 | |
f177940a JT |
1413 | if (from_cblock(cmd->cache_blocks) == 0) |
1414 | /* Nothing to do */ | |
1415 | return 0; | |
c6b4fcba | 1416 | |
f177940a JT |
1417 | r = dm_array_cursor_begin(&cmd->info, cmd->root, &cmd->mapping_cursor); |
1418 | if (r) | |
1419 | return r; | |
1420 | ||
1421 | if (hints_valid) { | |
1422 | r = dm_array_cursor_begin(&cmd->hint_info, cmd->hint_root, &cmd->hint_cursor); | |
1423 | if (r) { | |
1424 | dm_array_cursor_end(&cmd->mapping_cursor); | |
1425 | return r; | |
1426 | } | |
1427 | } | |
1428 | ||
629d0a8a JT |
1429 | if (separate_dirty_bits(cmd)) { |
1430 | r = dm_bitset_cursor_begin(&cmd->dirty_info, cmd->dirty_root, | |
1431 | from_cblock(cmd->cache_blocks), | |
1432 | &cmd->dirty_cursor); | |
1433 | if (r) { | |
1434 | dm_array_cursor_end(&cmd->hint_cursor); | |
1435 | dm_array_cursor_end(&cmd->mapping_cursor); | |
1436 | return r; | |
1437 | } | |
1438 | } | |
1439 | ||
f177940a | 1440 | for (cb = 0; ; cb++) { |
629d0a8a JT |
1441 | if (separate_dirty_bits(cmd)) |
1442 | r = __load_mapping_v2(cmd, cb, hints_valid, | |
1443 | &cmd->mapping_cursor, | |
1444 | &cmd->hint_cursor, | |
1445 | &cmd->dirty_cursor, | |
1446 | fn, context); | |
1447 | else | |
1448 | r = __load_mapping_v1(cmd, cb, hints_valid, | |
1449 | &cmd->mapping_cursor, &cmd->hint_cursor, | |
1450 | fn, context); | |
f177940a JT |
1451 | if (r) |
1452 | goto out; | |
1453 | ||
1454 | /* | |
1455 | * We need to break out before we move the cursors. | |
1456 | */ | |
1457 | if (cb >= (from_cblock(cmd->cache_blocks) - 1)) | |
1458 | break; | |
1459 | ||
1460 | r = dm_array_cursor_next(&cmd->mapping_cursor); | |
1461 | if (r) { | |
1462 | DMERR("dm_array_cursor_next for mapping failed"); | |
1463 | goto out; | |
1464 | } | |
1465 | ||
1466 | if (hints_valid) { | |
1467 | r = dm_array_cursor_next(&cmd->hint_cursor); | |
1468 | if (r) { | |
4561ffca JT |
1469 | dm_array_cursor_end(&cmd->hint_cursor); |
1470 | hints_valid = false; | |
f177940a JT |
1471 | } |
1472 | } | |
629d0a8a JT |
1473 | |
1474 | if (separate_dirty_bits(cmd)) { | |
1475 | r = dm_bitset_cursor_next(&cmd->dirty_cursor); | |
1476 | if (r) { | |
1477 | DMERR("dm_bitset_cursor_next for dirty failed"); | |
1478 | goto out; | |
1479 | } | |
1480 | } | |
f177940a JT |
1481 | } |
1482 | out: | |
1483 | dm_array_cursor_end(&cmd->mapping_cursor); | |
1484 | if (hints_valid) | |
1485 | dm_array_cursor_end(&cmd->hint_cursor); | |
1486 | ||
629d0a8a JT |
1487 | if (separate_dirty_bits(cmd)) |
1488 | dm_bitset_cursor_end(&cmd->dirty_cursor); | |
1489 | ||
f177940a | 1490 | return r; |
c6b4fcba JT |
1491 | } |
1492 | ||
ea2dd8c1 MS |
1493 | int dm_cache_load_mappings(struct dm_cache_metadata *cmd, |
1494 | struct dm_cache_policy *policy, | |
c6b4fcba JT |
1495 | load_mapping_fn fn, void *context) |
1496 | { | |
1497 | int r; | |
1498 | ||
d14fcf3d | 1499 | READ_LOCK(cmd); |
ea2dd8c1 | 1500 | r = __load_mappings(cmd, policy, fn, context); |
d14fcf3d | 1501 | READ_UNLOCK(cmd); |
c6b4fcba JT |
1502 | |
1503 | return r; | |
1504 | } | |
1505 | ||
1506 | static int __dump_mapping(void *context, uint64_t cblock, void *leaf) | |
1507 | { | |
1508 | int r = 0; | |
1509 | __le64 value; | |
1510 | dm_oblock_t oblock; | |
1511 | unsigned flags; | |
1512 | ||
1513 | memcpy(&value, leaf, sizeof(value)); | |
1514 | unpack_value(value, &oblock, &flags); | |
1515 | ||
1516 | return r; | |
1517 | } | |
1518 | ||
1519 | static int __dump_mappings(struct dm_cache_metadata *cmd) | |
1520 | { | |
1521 | return dm_array_walk(&cmd->info, cmd->root, __dump_mapping, NULL); | |
1522 | } | |
1523 | ||
1524 | void dm_cache_dump(struct dm_cache_metadata *cmd) | |
1525 | { | |
d14fcf3d | 1526 | READ_LOCK_VOID(cmd); |
c6b4fcba | 1527 | __dump_mappings(cmd); |
d14fcf3d | 1528 | READ_UNLOCK(cmd); |
c6b4fcba JT |
1529 | } |
1530 | ||
1531 | int dm_cache_changed_this_transaction(struct dm_cache_metadata *cmd) | |
1532 | { | |
1533 | int r; | |
1534 | ||
d14fcf3d | 1535 | READ_LOCK(cmd); |
c6b4fcba | 1536 | r = cmd->changed; |
d14fcf3d | 1537 | READ_UNLOCK(cmd); |
c6b4fcba JT |
1538 | |
1539 | return r; | |
1540 | } | |
1541 | ||
1542 | static int __dirty(struct dm_cache_metadata *cmd, dm_cblock_t cblock, bool dirty) | |
1543 | { | |
1544 | int r; | |
1545 | unsigned flags; | |
1546 | dm_oblock_t oblock; | |
1547 | __le64 value; | |
1548 | ||
1549 | r = dm_array_get_value(&cmd->info, cmd->root, from_cblock(cblock), &value); | |
1550 | if (r) | |
1551 | return r; | |
1552 | ||
1553 | unpack_value(value, &oblock, &flags); | |
1554 | ||
1555 | if (((flags & M_DIRTY) && dirty) || (!(flags & M_DIRTY) && !dirty)) | |
1556 | /* nothing to be done */ | |
1557 | return 0; | |
1558 | ||
79ed9caf | 1559 | value = pack_value(oblock, (flags & ~M_DIRTY) | (dirty ? M_DIRTY : 0)); |
c6b4fcba JT |
1560 | __dm_bless_for_disk(&value); |
1561 | ||
1562 | r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock), | |
1563 | &value, &cmd->root); | |
1564 | if (r) | |
1565 | return r; | |
1566 | ||
1567 | cmd->changed = true; | |
1568 | return 0; | |
1569 | ||
1570 | } | |
1571 | ||
629d0a8a JT |
1572 | static int __set_dirty_bits_v1(struct dm_cache_metadata *cmd, unsigned nr_bits, unsigned long *bits) |
1573 | { | |
1574 | int r; | |
1575 | unsigned i; | |
1576 | for (i = 0; i < nr_bits; i++) { | |
1577 | r = __dirty(cmd, to_cblock(i), test_bit(i, bits)); | |
1578 | if (r) | |
1579 | return r; | |
1580 | } | |
1581 | ||
1582 | return 0; | |
1583 | } | |
1584 | ||
683bb1a3 JT |
1585 | static int is_dirty_callback(uint32_t index, bool *value, void *context) |
1586 | { | |
1587 | unsigned long *bits = context; | |
1588 | *value = test_bit(index, bits); | |
1589 | return 0; | |
1590 | } | |
1591 | ||
629d0a8a JT |
1592 | static int __set_dirty_bits_v2(struct dm_cache_metadata *cmd, unsigned nr_bits, unsigned long *bits) |
1593 | { | |
1594 | int r = 0; | |
629d0a8a JT |
1595 | |
1596 | /* nr_bits is really just a sanity check */ | |
1597 | if (nr_bits != from_cblock(cmd->cache_blocks)) { | |
1598 | DMERR("dirty bitset is wrong size"); | |
1599 | return -EINVAL; | |
1600 | } | |
1601 | ||
683bb1a3 JT |
1602 | r = dm_bitset_del(&cmd->dirty_info, cmd->dirty_root); |
1603 | if (r) | |
1604 | return r; | |
629d0a8a JT |
1605 | |
1606 | cmd->changed = true; | |
683bb1a3 | 1607 | return dm_bitset_new(&cmd->dirty_info, &cmd->dirty_root, nr_bits, is_dirty_callback, bits); |
629d0a8a JT |
1608 | } |
1609 | ||
1610 | int dm_cache_set_dirty_bits(struct dm_cache_metadata *cmd, | |
1611 | unsigned nr_bits, | |
1612 | unsigned long *bits) | |
c6b4fcba JT |
1613 | { |
1614 | int r; | |
1615 | ||
028ae9f7 | 1616 | WRITE_LOCK(cmd); |
629d0a8a JT |
1617 | if (separate_dirty_bits(cmd)) |
1618 | r = __set_dirty_bits_v2(cmd, nr_bits, bits); | |
1619 | else | |
1620 | r = __set_dirty_bits_v1(cmd, nr_bits, bits); | |
028ae9f7 | 1621 | WRITE_UNLOCK(cmd); |
c6b4fcba JT |
1622 | |
1623 | return r; | |
1624 | } | |
1625 | ||
1626 | void dm_cache_metadata_get_stats(struct dm_cache_metadata *cmd, | |
1627 | struct dm_cache_statistics *stats) | |
1628 | { | |
d14fcf3d | 1629 | READ_LOCK_VOID(cmd); |
8c5008fa | 1630 | *stats = cmd->stats; |
d14fcf3d | 1631 | READ_UNLOCK(cmd); |
c6b4fcba JT |
1632 | } |
1633 | ||
1634 | void dm_cache_metadata_set_stats(struct dm_cache_metadata *cmd, | |
1635 | struct dm_cache_statistics *stats) | |
1636 | { | |
028ae9f7 | 1637 | WRITE_LOCK_VOID(cmd); |
8c5008fa | 1638 | cmd->stats = *stats; |
028ae9f7 | 1639 | WRITE_UNLOCK(cmd); |
c6b4fcba JT |
1640 | } |
1641 | ||
1642 | int dm_cache_commit(struct dm_cache_metadata *cmd, bool clean_shutdown) | |
1643 | { | |
10add84e | 1644 | int r = -EINVAL; |
c6b4fcba JT |
1645 | flags_mutator mutator = (clean_shutdown ? set_clean_shutdown : |
1646 | clear_clean_shutdown); | |
1647 | ||
028ae9f7 | 1648 | WRITE_LOCK(cmd); |
10add84e MS |
1649 | if (cmd->fail_io) |
1650 | goto out; | |
1651 | ||
c6b4fcba JT |
1652 | r = __commit_transaction(cmd, mutator); |
1653 | if (r) | |
1654 | goto out; | |
1655 | ||
1656 | r = __begin_transaction(cmd); | |
c6b4fcba | 1657 | out: |
028ae9f7 | 1658 | WRITE_UNLOCK(cmd); |
c6b4fcba JT |
1659 | return r; |
1660 | } | |
1661 | ||
1662 | int dm_cache_get_free_metadata_block_count(struct dm_cache_metadata *cmd, | |
1663 | dm_block_t *result) | |
1664 | { | |
1665 | int r = -EINVAL; | |
1666 | ||
d14fcf3d | 1667 | READ_LOCK(cmd); |
10add84e MS |
1668 | if (!cmd->fail_io) |
1669 | r = dm_sm_get_nr_free(cmd->metadata_sm, result); | |
d14fcf3d | 1670 | READ_UNLOCK(cmd); |
c6b4fcba JT |
1671 | |
1672 | return r; | |
1673 | } | |
1674 | ||
1675 | int dm_cache_get_metadata_dev_size(struct dm_cache_metadata *cmd, | |
1676 | dm_block_t *result) | |
1677 | { | |
1678 | int r = -EINVAL; | |
1679 | ||
d14fcf3d | 1680 | READ_LOCK(cmd); |
10add84e MS |
1681 | if (!cmd->fail_io) |
1682 | r = dm_sm_get_nr_blocks(cmd->metadata_sm, result); | |
d14fcf3d | 1683 | READ_UNLOCK(cmd); |
c6b4fcba JT |
1684 | |
1685 | return r; | |
1686 | } | |
1687 | ||
1688 | /*----------------------------------------------------------------*/ | |
1689 | ||
4e781b49 JT |
1690 | static int get_hint(uint32_t index, void *value_le, void *context) |
1691 | { | |
1692 | uint32_t value; | |
1693 | struct dm_cache_policy *policy = context; | |
1694 | ||
1695 | value = policy_get_hint(policy, to_cblock(index)); | |
1696 | *((__le32 *) value_le) = cpu_to_le32(value); | |
1697 | ||
1698 | return 0; | |
1699 | } | |
1700 | ||
1701 | /* | |
1702 | * It's quicker to always delete the hint array, and recreate with | |
1703 | * dm_array_new(). | |
1704 | */ | |
1705 | static int write_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy) | |
c6b4fcba JT |
1706 | { |
1707 | int r; | |
c6b4fcba JT |
1708 | size_t hint_size; |
1709 | const char *policy_name = dm_cache_policy_get_name(policy); | |
4e7f506f | 1710 | const unsigned *policy_version = dm_cache_policy_get_version(policy); |
c6b4fcba JT |
1711 | |
1712 | if (!policy_name[0] || | |
1713 | (strlen(policy_name) > sizeof(cmd->policy_name) - 1)) | |
1714 | return -EINVAL; | |
1715 | ||
4e781b49 JT |
1716 | strncpy(cmd->policy_name, policy_name, sizeof(cmd->policy_name)); |
1717 | memcpy(cmd->policy_version, policy_version, sizeof(cmd->policy_version)); | |
c6b4fcba | 1718 | |
4e781b49 JT |
1719 | hint_size = dm_cache_policy_get_hint_size(policy); |
1720 | if (!hint_size) | |
1721 | return 0; /* short-circuit hints initialization */ | |
1722 | cmd->policy_hint_size = hint_size; | |
c6b4fcba | 1723 | |
4e781b49 JT |
1724 | if (cmd->hint_root) { |
1725 | r = dm_array_del(&cmd->hint_info, cmd->hint_root); | |
c6b4fcba JT |
1726 | if (r) |
1727 | return r; | |
0596661f JT |
1728 | } |
1729 | ||
4e781b49 JT |
1730 | return dm_array_new(&cmd->hint_info, &cmd->hint_root, |
1731 | from_cblock(cmd->cache_blocks), | |
1732 | get_hint, policy); | |
0596661f JT |
1733 | } |
1734 | ||
1735 | int dm_cache_write_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy) | |
1736 | { | |
1737 | int r; | |
c6b4fcba | 1738 | |
028ae9f7 | 1739 | WRITE_LOCK(cmd); |
0596661f | 1740 | r = write_hints(cmd, policy); |
028ae9f7 | 1741 | WRITE_UNLOCK(cmd); |
c6b4fcba JT |
1742 | |
1743 | return r; | |
1744 | } | |
2ee57d58 JT |
1745 | |
1746 | int dm_cache_metadata_all_clean(struct dm_cache_metadata *cmd, bool *result) | |
1747 | { | |
d14fcf3d JT |
1748 | int r; |
1749 | ||
1750 | READ_LOCK(cmd); | |
1751 | r = blocks_are_unmapped_or_clean(cmd, 0, cmd->cache_blocks, result); | |
1752 | READ_UNLOCK(cmd); | |
1753 | ||
1754 | return r; | |
2ee57d58 | 1755 | } |
028ae9f7 JT |
1756 | |
1757 | void dm_cache_metadata_set_read_only(struct dm_cache_metadata *cmd) | |
1758 | { | |
1759 | WRITE_LOCK_VOID(cmd); | |
1760 | dm_bm_set_read_only(cmd->bm); | |
1761 | WRITE_UNLOCK(cmd); | |
1762 | } | |
1763 | ||
1764 | void dm_cache_metadata_set_read_write(struct dm_cache_metadata *cmd) | |
1765 | { | |
1766 | WRITE_LOCK_VOID(cmd); | |
1767 | dm_bm_set_read_write(cmd->bm); | |
1768 | WRITE_UNLOCK(cmd); | |
1769 | } | |
1770 | ||
1771 | int dm_cache_metadata_set_needs_check(struct dm_cache_metadata *cmd) | |
1772 | { | |
1773 | int r; | |
1774 | struct dm_block *sblock; | |
1775 | struct cache_disk_superblock *disk_super; | |
1776 | ||
d14fcf3d | 1777 | WRITE_LOCK(cmd); |
028ae9f7 JT |
1778 | set_bit(NEEDS_CHECK, &cmd->flags); |
1779 | ||
1780 | r = superblock_lock(cmd, &sblock); | |
1781 | if (r) { | |
1782 | DMERR("couldn't read superblock"); | |
1783 | goto out; | |
1784 | } | |
1785 | ||
1786 | disk_super = dm_block_data(sblock); | |
1787 | disk_super->flags = cpu_to_le32(cmd->flags); | |
1788 | ||
1789 | dm_bm_unlock(sblock); | |
1790 | ||
1791 | out: | |
d14fcf3d | 1792 | WRITE_UNLOCK(cmd); |
028ae9f7 JT |
1793 | return r; |
1794 | } | |
1795 | ||
d14fcf3d | 1796 | int dm_cache_metadata_needs_check(struct dm_cache_metadata *cmd, bool *result) |
028ae9f7 | 1797 | { |
d14fcf3d JT |
1798 | READ_LOCK(cmd); |
1799 | *result = !!test_bit(NEEDS_CHECK, &cmd->flags); | |
1800 | READ_UNLOCK(cmd); | |
028ae9f7 | 1801 | |
d14fcf3d | 1802 | return 0; |
028ae9f7 JT |
1803 | } |
1804 | ||
1805 | int dm_cache_metadata_abort(struct dm_cache_metadata *cmd) | |
1806 | { | |
1807 | int r; | |
1808 | ||
1809 | WRITE_LOCK(cmd); | |
1810 | __destroy_persistent_data_objects(cmd); | |
1811 | r = __create_persistent_data_objects(cmd, false); | |
1812 | if (r) | |
1813 | cmd->fail_io = true; | |
1814 | WRITE_UNLOCK(cmd); | |
1815 | ||
1816 | return r; | |
1817 | } |