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