Commit | Line | Data |
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991d9fa0 | 1 | /* |
da105ed5 | 2 | * Copyright (C) 2011-2012 Red Hat, Inc. |
991d9fa0 JT |
3 | * |
4 | * This file is released under the GPL. | |
5 | */ | |
6 | ||
7 | #include "dm-thin-metadata.h" | |
8 | #include "persistent-data/dm-btree.h" | |
9 | #include "persistent-data/dm-space-map.h" | |
10 | #include "persistent-data/dm-space-map-disk.h" | |
11 | #include "persistent-data/dm-transaction-manager.h" | |
12 | ||
13 | #include <linux/list.h> | |
14 | #include <linux/device-mapper.h> | |
15 | #include <linux/workqueue.h> | |
16 | ||
17 | /*-------------------------------------------------------------------------- | |
18 | * As far as the metadata goes, there is: | |
19 | * | |
20 | * - A superblock in block zero, taking up fewer than 512 bytes for | |
21 | * atomic writes. | |
22 | * | |
23 | * - A space map managing the metadata blocks. | |
24 | * | |
25 | * - A space map managing the data blocks. | |
26 | * | |
27 | * - A btree mapping our internal thin dev ids onto struct disk_device_details. | |
28 | * | |
29 | * - A hierarchical btree, with 2 levels which effectively maps (thin | |
30 | * dev id, virtual block) -> block_time. Block time is a 64-bit | |
43069040 | 31 | * field holding the time in the low 24 bits, and block in the top 40 |
991d9fa0 JT |
32 | * bits. |
33 | * | |
34 | * BTrees consist solely of btree_nodes, that fill a block. Some are | |
35 | * internal nodes, as such their values are a __le64 pointing to other | |
36 | * nodes. Leaf nodes can store data of any reasonable size (ie. much | |
37 | * smaller than the block size). The nodes consist of the header, | |
38 | * followed by an array of keys, followed by an array of values. We have | |
39 | * to binary search on the keys so they're all held together to help the | |
40 | * cpu cache. | |
41 | * | |
42 | * Space maps have 2 btrees: | |
43 | * | |
44 | * - One maps a uint64_t onto a struct index_entry. Which points to a | |
45 | * bitmap block, and has some details about how many free entries there | |
46 | * are etc. | |
47 | * | |
48 | * - The bitmap blocks have a header (for the checksum). Then the rest | |
49 | * of the block is pairs of bits. With the meaning being: | |
50 | * | |
51 | * 0 - ref count is 0 | |
52 | * 1 - ref count is 1 | |
53 | * 2 - ref count is 2 | |
54 | * 3 - ref count is higher than 2 | |
55 | * | |
56 | * - If the count is higher than 2 then the ref count is entered in a | |
57 | * second btree that directly maps the block_address to a uint32_t ref | |
58 | * count. | |
59 | * | |
60 | * The space map metadata variant doesn't have a bitmaps btree. Instead | |
61 | * it has one single blocks worth of index_entries. This avoids | |
62 | * recursive issues with the bitmap btree needing to allocate space in | |
63 | * order to insert. With a small data block size such as 64k the | |
64 | * metadata support data devices that are hundreds of terrabytes. | |
65 | * | |
66 | * The space maps allocate space linearly from front to back. Space that | |
67 | * is freed in a transaction is never recycled within that transaction. | |
68 | * To try and avoid fragmenting _free_ space the allocator always goes | |
69 | * back and fills in gaps. | |
70 | * | |
71 | * All metadata io is in THIN_METADATA_BLOCK_SIZE sized/aligned chunks | |
72 | * from the block manager. | |
73 | *--------------------------------------------------------------------------*/ | |
74 | ||
75 | #define DM_MSG_PREFIX "thin metadata" | |
76 | ||
77 | #define THIN_SUPERBLOCK_MAGIC 27022010 | |
78 | #define THIN_SUPERBLOCK_LOCATION 0 | |
07f2b6e0 | 79 | #define THIN_VERSION 2 |
991d9fa0 JT |
80 | #define SECTOR_TO_BLOCK_SHIFT 3 |
81 | ||
8c971178 | 82 | /* |
490ae017 | 83 | * For btree insert: |
8c971178 JT |
84 | * 3 for btree insert + |
85 | * 2 for btree lookup used within space map | |
490ae017 DY |
86 | * For btree remove: |
87 | * 2 for shadow spine + | |
88 | * 4 for rebalance 3 child node | |
8c971178 | 89 | */ |
490ae017 | 90 | #define THIN_MAX_CONCURRENT_LOCKS 6 |
8c971178 | 91 | |
991d9fa0 JT |
92 | /* This should be plenty */ |
93 | #define SPACE_MAP_ROOT_SIZE 128 | |
94 | ||
95 | /* | |
96 | * Little endian on-disk superblock and device details. | |
97 | */ | |
98 | struct thin_disk_superblock { | |
99 | __le32 csum; /* Checksum of superblock except for this field. */ | |
100 | __le32 flags; | |
101 | __le64 blocknr; /* This block number, dm_block_t. */ | |
102 | ||
103 | __u8 uuid[16]; | |
104 | __le64 magic; | |
105 | __le32 version; | |
106 | __le32 time; | |
107 | ||
108 | __le64 trans_id; | |
109 | ||
110 | /* | |
111 | * Root held by userspace transactions. | |
112 | */ | |
113 | __le64 held_root; | |
114 | ||
115 | __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
116 | __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
117 | ||
118 | /* | |
119 | * 2-level btree mapping (dev_id, (dev block, time)) -> data block | |
120 | */ | |
121 | __le64 data_mapping_root; | |
122 | ||
123 | /* | |
124 | * Device detail root mapping dev_id -> device_details | |
125 | */ | |
126 | __le64 device_details_root; | |
127 | ||
128 | __le32 data_block_size; /* In 512-byte sectors. */ | |
129 | ||
130 | __le32 metadata_block_size; /* In 512-byte sectors. */ | |
131 | __le64 metadata_nr_blocks; | |
132 | ||
133 | __le32 compat_flags; | |
134 | __le32 compat_ro_flags; | |
135 | __le32 incompat_flags; | |
136 | } __packed; | |
137 | ||
138 | struct disk_device_details { | |
139 | __le64 mapped_blocks; | |
140 | __le64 transaction_id; /* When created. */ | |
141 | __le32 creation_time; | |
142 | __le32 snapshotted_time; | |
143 | } __packed; | |
144 | ||
145 | struct dm_pool_metadata { | |
146 | struct hlist_node hash; | |
147 | ||
148 | struct block_device *bdev; | |
149 | struct dm_block_manager *bm; | |
150 | struct dm_space_map *metadata_sm; | |
151 | struct dm_space_map *data_sm; | |
152 | struct dm_transaction_manager *tm; | |
153 | struct dm_transaction_manager *nb_tm; | |
154 | ||
155 | /* | |
156 | * Two-level btree. | |
157 | * First level holds thin_dev_t. | |
158 | * Second level holds mappings. | |
159 | */ | |
160 | struct dm_btree_info info; | |
161 | ||
162 | /* | |
163 | * Non-blocking version of the above. | |
164 | */ | |
165 | struct dm_btree_info nb_info; | |
166 | ||
167 | /* | |
168 | * Just the top level for deleting whole devices. | |
169 | */ | |
170 | struct dm_btree_info tl_info; | |
171 | ||
172 | /* | |
173 | * Just the bottom level for creating new devices. | |
174 | */ | |
175 | struct dm_btree_info bl_info; | |
176 | ||
177 | /* | |
178 | * Describes the device details btree. | |
179 | */ | |
180 | struct dm_btree_info details_info; | |
181 | ||
182 | struct rw_semaphore root_lock; | |
183 | uint32_t time; | |
991d9fa0 JT |
184 | dm_block_t root; |
185 | dm_block_t details_root; | |
186 | struct list_head thin_devices; | |
187 | uint64_t trans_id; | |
188 | unsigned long flags; | |
189 | sector_t data_block_size; | |
da105ed5 | 190 | |
ecda7c02 NT |
191 | /* |
192 | * Pre-commit callback. | |
193 | * | |
194 | * This allows the thin provisioning target to run a callback before | |
195 | * the metadata are committed. | |
196 | */ | |
197 | dm_pool_pre_commit_fn pre_commit_fn; | |
198 | void *pre_commit_context; | |
199 | ||
3ab91828 JT |
200 | /* |
201 | * We reserve a section of the metadata for commit overhead. | |
202 | * All reported space does *not* include this. | |
203 | */ | |
204 | dm_block_t metadata_reserve; | |
205 | ||
da105ed5 JT |
206 | /* |
207 | * Set if a transaction has to be aborted but the attempt to roll back | |
208 | * to the previous (good) transaction failed. The only pool metadata | |
209 | * operation possible in this state is the closing of the device. | |
210 | */ | |
211 | bool fail_io:1; | |
5a32083d | 212 | |
873f258b MS |
213 | /* |
214 | * Set once a thin-pool has been accessed through one of the interfaces | |
215 | * that imply the pool is in-service (e.g. thin devices created/deleted, | |
216 | * thin-pool message, metadata snapshots, etc). | |
217 | */ | |
218 | bool in_service:1; | |
219 | ||
5a32083d JT |
220 | /* |
221 | * Reading the space map roots can fail, so we read it into these | |
222 | * buffers before the superblock is locked and updated. | |
223 | */ | |
224 | __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
225 | __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
991d9fa0 JT |
226 | }; |
227 | ||
228 | struct dm_thin_device { | |
229 | struct list_head list; | |
230 | struct dm_pool_metadata *pmd; | |
231 | dm_thin_id id; | |
232 | ||
233 | int open_count; | |
da105ed5 JT |
234 | bool changed:1; |
235 | bool aborted_with_changes:1; | |
991d9fa0 JT |
236 | uint64_t mapped_blocks; |
237 | uint64_t transaction_id; | |
238 | uint32_t creation_time; | |
239 | uint32_t snapshotted_time; | |
240 | }; | |
241 | ||
242 | /*---------------------------------------------------------------- | |
243 | * superblock validator | |
244 | *--------------------------------------------------------------*/ | |
245 | ||
246 | #define SUPERBLOCK_CSUM_XOR 160774 | |
247 | ||
248 | static void sb_prepare_for_write(struct dm_block_validator *v, | |
249 | struct dm_block *b, | |
250 | size_t block_size) | |
251 | { | |
252 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
253 | ||
254 | disk_super->blocknr = cpu_to_le64(dm_block_location(b)); | |
255 | disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
256 | block_size - sizeof(__le32), | |
257 | SUPERBLOCK_CSUM_XOR)); | |
258 | } | |
259 | ||
260 | static int sb_check(struct dm_block_validator *v, | |
261 | struct dm_block *b, | |
262 | size_t block_size) | |
263 | { | |
264 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
265 | __le32 csum_le; | |
266 | ||
267 | if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) { | |
268 | DMERR("sb_check failed: blocknr %llu: " | |
269 | "wanted %llu", le64_to_cpu(disk_super->blocknr), | |
270 | (unsigned long long)dm_block_location(b)); | |
271 | return -ENOTBLK; | |
272 | } | |
273 | ||
274 | if (le64_to_cpu(disk_super->magic) != THIN_SUPERBLOCK_MAGIC) { | |
275 | DMERR("sb_check failed: magic %llu: " | |
276 | "wanted %llu", le64_to_cpu(disk_super->magic), | |
277 | (unsigned long long)THIN_SUPERBLOCK_MAGIC); | |
278 | return -EILSEQ; | |
279 | } | |
280 | ||
281 | csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
282 | block_size - sizeof(__le32), | |
283 | SUPERBLOCK_CSUM_XOR)); | |
284 | if (csum_le != disk_super->csum) { | |
285 | DMERR("sb_check failed: csum %u: wanted %u", | |
286 | le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum)); | |
287 | return -EILSEQ; | |
288 | } | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static struct dm_block_validator sb_validator = { | |
294 | .name = "superblock", | |
295 | .prepare_for_write = sb_prepare_for_write, | |
296 | .check = sb_check | |
297 | }; | |
298 | ||
299 | /*---------------------------------------------------------------- | |
300 | * Methods for the btree value types | |
301 | *--------------------------------------------------------------*/ | |
302 | ||
303 | static uint64_t pack_block_time(dm_block_t b, uint32_t t) | |
304 | { | |
305 | return (b << 24) | t; | |
306 | } | |
307 | ||
308 | static void unpack_block_time(uint64_t v, dm_block_t *b, uint32_t *t) | |
309 | { | |
310 | *b = v >> 24; | |
311 | *t = v & ((1 << 24) - 1); | |
312 | } | |
313 | ||
018cede9 | 314 | static void data_block_inc(void *context, const void *value_le) |
991d9fa0 JT |
315 | { |
316 | struct dm_space_map *sm = context; | |
317 | __le64 v_le; | |
318 | uint64_t b; | |
319 | uint32_t t; | |
320 | ||
321 | memcpy(&v_le, value_le, sizeof(v_le)); | |
322 | unpack_block_time(le64_to_cpu(v_le), &b, &t); | |
323 | dm_sm_inc_block(sm, b); | |
324 | } | |
325 | ||
018cede9 | 326 | static void data_block_dec(void *context, const void *value_le) |
991d9fa0 JT |
327 | { |
328 | struct dm_space_map *sm = context; | |
329 | __le64 v_le; | |
330 | uint64_t b; | |
331 | uint32_t t; | |
332 | ||
333 | memcpy(&v_le, value_le, sizeof(v_le)); | |
334 | unpack_block_time(le64_to_cpu(v_le), &b, &t); | |
335 | dm_sm_dec_block(sm, b); | |
336 | } | |
337 | ||
018cede9 | 338 | static int data_block_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
339 | { |
340 | __le64 v1_le, v2_le; | |
341 | uint64_t b1, b2; | |
342 | uint32_t t; | |
343 | ||
344 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
345 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
346 | unpack_block_time(le64_to_cpu(v1_le), &b1, &t); | |
347 | unpack_block_time(le64_to_cpu(v2_le), &b2, &t); | |
348 | ||
349 | return b1 == b2; | |
350 | } | |
351 | ||
018cede9 | 352 | static void subtree_inc(void *context, const void *value) |
991d9fa0 JT |
353 | { |
354 | struct dm_btree_info *info = context; | |
355 | __le64 root_le; | |
356 | uint64_t root; | |
357 | ||
358 | memcpy(&root_le, value, sizeof(root_le)); | |
359 | root = le64_to_cpu(root_le); | |
360 | dm_tm_inc(info->tm, root); | |
361 | } | |
362 | ||
018cede9 | 363 | static void subtree_dec(void *context, const void *value) |
991d9fa0 JT |
364 | { |
365 | struct dm_btree_info *info = context; | |
366 | __le64 root_le; | |
367 | uint64_t root; | |
368 | ||
369 | memcpy(&root_le, value, sizeof(root_le)); | |
370 | root = le64_to_cpu(root_le); | |
371 | if (dm_btree_del(info, root)) | |
29f929b5 | 372 | DMERR("btree delete failed"); |
991d9fa0 JT |
373 | } |
374 | ||
018cede9 | 375 | static int subtree_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
376 | { |
377 | __le64 v1_le, v2_le; | |
378 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
379 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
380 | ||
381 | return v1_le == v2_le; | |
382 | } | |
383 | ||
384 | /*----------------------------------------------------------------*/ | |
385 | ||
873f258b MS |
386 | /* |
387 | * Variant that is used for in-core only changes or code that | |
388 | * shouldn't put the pool in service on its own (e.g. commit). | |
389 | */ | |
44d8ebf4 | 390 | static inline void pmd_write_lock_in_core(struct dm_pool_metadata *pmd) |
6a1b1ddc MS |
391 | __acquires(pmd->root_lock) |
392 | { | |
393 | down_write(&pmd->root_lock); | |
394 | } | |
6a1b1ddc MS |
395 | |
396 | static inline void pmd_write_lock(struct dm_pool_metadata *pmd) | |
397 | { | |
44d8ebf4 | 398 | pmd_write_lock_in_core(pmd); |
873f258b MS |
399 | if (unlikely(!pmd->in_service)) |
400 | pmd->in_service = true; | |
6a1b1ddc MS |
401 | } |
402 | ||
403 | static inline void pmd_write_unlock(struct dm_pool_metadata *pmd) | |
404 | __releases(pmd->root_lock) | |
405 | { | |
406 | up_write(&pmd->root_lock); | |
407 | } | |
408 | ||
409 | /*----------------------------------------------------------------*/ | |
410 | ||
25971192 JT |
411 | static int superblock_lock_zero(struct dm_pool_metadata *pmd, |
412 | struct dm_block **sblock) | |
413 | { | |
414 | return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
415 | &sb_validator, sblock); | |
416 | } | |
417 | ||
418 | static int superblock_lock(struct dm_pool_metadata *pmd, | |
419 | struct dm_block **sblock) | |
420 | { | |
421 | return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
422 | &sb_validator, sblock); | |
423 | } | |
424 | ||
332627db | 425 | static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result) |
991d9fa0 JT |
426 | { |
427 | int r; | |
428 | unsigned i; | |
429 | struct dm_block *b; | |
430 | __le64 *data_le, zero = cpu_to_le64(0); | |
431 | unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64); | |
432 | ||
433 | /* | |
434 | * We can't use a validator here - it may be all zeroes. | |
435 | */ | |
436 | r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b); | |
437 | if (r) | |
438 | return r; | |
439 | ||
440 | data_le = dm_block_data(b); | |
441 | *result = 1; | |
442 | for (i = 0; i < block_size; i++) { | |
443 | if (data_le[i] != zero) { | |
444 | *result = 0; | |
445 | break; | |
446 | } | |
447 | } | |
448 | ||
4c7da06f MP |
449 | dm_bm_unlock(b); |
450 | ||
451 | return 0; | |
991d9fa0 JT |
452 | } |
453 | ||
41675aea JT |
454 | static void __setup_btree_details(struct dm_pool_metadata *pmd) |
455 | { | |
456 | pmd->info.tm = pmd->tm; | |
457 | pmd->info.levels = 2; | |
458 | pmd->info.value_type.context = pmd->data_sm; | |
459 | pmd->info.value_type.size = sizeof(__le64); | |
460 | pmd->info.value_type.inc = data_block_inc; | |
461 | pmd->info.value_type.dec = data_block_dec; | |
462 | pmd->info.value_type.equal = data_block_equal; | |
463 | ||
464 | memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info)); | |
465 | pmd->nb_info.tm = pmd->nb_tm; | |
466 | ||
467 | pmd->tl_info.tm = pmd->tm; | |
468 | pmd->tl_info.levels = 1; | |
e3cbf945 | 469 | pmd->tl_info.value_type.context = &pmd->bl_info; |
41675aea JT |
470 | pmd->tl_info.value_type.size = sizeof(__le64); |
471 | pmd->tl_info.value_type.inc = subtree_inc; | |
472 | pmd->tl_info.value_type.dec = subtree_dec; | |
473 | pmd->tl_info.value_type.equal = subtree_equal; | |
474 | ||
475 | pmd->bl_info.tm = pmd->tm; | |
476 | pmd->bl_info.levels = 1; | |
477 | pmd->bl_info.value_type.context = pmd->data_sm; | |
478 | pmd->bl_info.value_type.size = sizeof(__le64); | |
479 | pmd->bl_info.value_type.inc = data_block_inc; | |
480 | pmd->bl_info.value_type.dec = data_block_dec; | |
481 | pmd->bl_info.value_type.equal = data_block_equal; | |
482 | ||
483 | pmd->details_info.tm = pmd->tm; | |
484 | pmd->details_info.levels = 1; | |
485 | pmd->details_info.value_type.context = NULL; | |
486 | pmd->details_info.value_type.size = sizeof(struct disk_device_details); | |
487 | pmd->details_info.value_type.inc = NULL; | |
488 | pmd->details_info.value_type.dec = NULL; | |
489 | pmd->details_info.value_type.equal = NULL; | |
490 | } | |
491 | ||
5a32083d JT |
492 | static int save_sm_roots(struct dm_pool_metadata *pmd) |
493 | { | |
494 | int r; | |
495 | size_t len; | |
496 | ||
497 | r = dm_sm_root_size(pmd->metadata_sm, &len); | |
498 | if (r < 0) | |
499 | return r; | |
500 | ||
501 | r = dm_sm_copy_root(pmd->metadata_sm, &pmd->metadata_space_map_root, len); | |
502 | if (r < 0) | |
503 | return r; | |
504 | ||
505 | r = dm_sm_root_size(pmd->data_sm, &len); | |
506 | if (r < 0) | |
507 | return r; | |
508 | ||
509 | return dm_sm_copy_root(pmd->data_sm, &pmd->data_space_map_root, len); | |
510 | } | |
511 | ||
512 | static void copy_sm_roots(struct dm_pool_metadata *pmd, | |
513 | struct thin_disk_superblock *disk) | |
514 | { | |
515 | memcpy(&disk->metadata_space_map_root, | |
516 | &pmd->metadata_space_map_root, | |
517 | sizeof(pmd->metadata_space_map_root)); | |
518 | ||
519 | memcpy(&disk->data_space_map_root, | |
520 | &pmd->data_space_map_root, | |
521 | sizeof(pmd->data_space_map_root)); | |
522 | } | |
523 | ||
9cb6653f JT |
524 | static int __write_initial_superblock(struct dm_pool_metadata *pmd) |
525 | { | |
526 | int r; | |
527 | struct dm_block *sblock; | |
528 | struct thin_disk_superblock *disk_super; | |
529 | sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT; | |
530 | ||
531 | if (bdev_size > THIN_METADATA_MAX_SECTORS) | |
532 | bdev_size = THIN_METADATA_MAX_SECTORS; | |
533 | ||
5a32083d | 534 | r = dm_sm_commit(pmd->data_sm); |
10d2a9ff JT |
535 | if (r < 0) |
536 | return r; | |
537 | ||
91bcdb92 | 538 | r = dm_tm_pre_commit(pmd->tm); |
10d2a9ff JT |
539 | if (r < 0) |
540 | return r; | |
541 | ||
91bcdb92 | 542 | r = save_sm_roots(pmd); |
10d2a9ff JT |
543 | if (r < 0) |
544 | return r; | |
545 | ||
9cb6653f JT |
546 | r = superblock_lock_zero(pmd, &sblock); |
547 | if (r) | |
548 | return r; | |
549 | ||
550 | disk_super = dm_block_data(sblock); | |
10d2a9ff | 551 | disk_super->flags = 0; |
583ceee2 | 552 | memset(disk_super->uuid, 0, sizeof(disk_super->uuid)); |
9cb6653f JT |
553 | disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC); |
554 | disk_super->version = cpu_to_le32(THIN_VERSION); | |
555 | disk_super->time = 0; | |
10d2a9ff JT |
556 | disk_super->trans_id = 0; |
557 | disk_super->held_root = 0; | |
558 | ||
5a32083d | 559 | copy_sm_roots(pmd, disk_super); |
10d2a9ff JT |
560 | |
561 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
562 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
7d48935e | 563 | disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE); |
9cb6653f JT |
564 | disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT); |
565 | disk_super->data_block_size = cpu_to_le32(pmd->data_block_size); | |
566 | ||
270938ba | 567 | return dm_tm_commit(pmd->tm, sblock); |
9cb6653f JT |
568 | } |
569 | ||
a97e5e6f | 570 | static int __format_metadata(struct dm_pool_metadata *pmd) |
991d9fa0 JT |
571 | { |
572 | int r; | |
384ef0e6 | 573 | |
e4d2205c JT |
574 | r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
575 | &pmd->tm, &pmd->metadata_sm); | |
576 | if (r < 0) { | |
577 | DMERR("tm_create_with_sm failed"); | |
578 | return r; | |
579 | } | |
991d9fa0 | 580 | |
a97e5e6f | 581 | pmd->data_sm = dm_sm_disk_create(pmd->tm, 0); |
e4d2205c JT |
582 | if (IS_ERR(pmd->data_sm)) { |
583 | DMERR("sm_disk_create failed"); | |
584 | r = PTR_ERR(pmd->data_sm); | |
0fa5b17b | 585 | goto bad_cleanup_tm; |
991d9fa0 JT |
586 | } |
587 | ||
d6332814 | 588 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
991d9fa0 | 589 | if (!pmd->nb_tm) { |
0fa5b17b | 590 | DMERR("could not create non-blocking clone tm"); |
991d9fa0 | 591 | r = -ENOMEM; |
0fa5b17b | 592 | goto bad_cleanup_data_sm; |
991d9fa0 JT |
593 | } |
594 | ||
41675aea | 595 | __setup_btree_details(pmd); |
991d9fa0 | 596 | |
9cb6653f JT |
597 | r = dm_btree_empty(&pmd->info, &pmd->root); |
598 | if (r < 0) | |
0fa5b17b | 599 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
600 | |
601 | r = dm_btree_empty(&pmd->details_info, &pmd->details_root); | |
602 | if (r < 0) { | |
603 | DMERR("couldn't create devices root"); | |
0fa5b17b | 604 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
605 | } |
606 | ||
607 | r = __write_initial_superblock(pmd); | |
608 | if (r) | |
0fa5b17b | 609 | goto bad_cleanup_nb_tm; |
9cb6653f | 610 | |
991d9fa0 JT |
611 | return 0; |
612 | ||
0fa5b17b JT |
613 | bad_cleanup_nb_tm: |
614 | dm_tm_destroy(pmd->nb_tm); | |
615 | bad_cleanup_data_sm: | |
d6332814 | 616 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 617 | bad_cleanup_tm: |
d6332814 JT |
618 | dm_tm_destroy(pmd->tm); |
619 | dm_sm_destroy(pmd->metadata_sm); | |
991d9fa0 JT |
620 | |
621 | return r; | |
622 | } | |
623 | ||
d73ec525 MS |
624 | static int __check_incompat_features(struct thin_disk_superblock *disk_super, |
625 | struct dm_pool_metadata *pmd) | |
626 | { | |
627 | uint32_t features; | |
628 | ||
629 | features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP; | |
630 | if (features) { | |
631 | DMERR("could not access metadata due to unsupported optional features (%lx).", | |
632 | (unsigned long)features); | |
633 | return -EINVAL; | |
634 | } | |
635 | ||
636 | /* | |
637 | * Check for read-only metadata to skip the following RDWR checks. | |
638 | */ | |
1e0dcca9 | 639 | if (bdev_read_only(pmd->bdev)) |
d73ec525 MS |
640 | return 0; |
641 | ||
642 | features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP; | |
643 | if (features) { | |
644 | DMERR("could not access metadata RDWR due to unsupported optional features (%lx).", | |
645 | (unsigned long)features); | |
646 | return -EINVAL; | |
647 | } | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
e4d2205c JT |
652 | static int __open_metadata(struct dm_pool_metadata *pmd) |
653 | { | |
654 | int r; | |
655 | struct dm_block *sblock; | |
656 | struct thin_disk_superblock *disk_super; | |
657 | ||
658 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
659 | &sb_validator, &sblock); | |
660 | if (r < 0) { | |
661 | DMERR("couldn't read superblock"); | |
662 | return r; | |
663 | } | |
664 | ||
665 | disk_super = dm_block_data(sblock); | |
d73ec525 | 666 | |
9aec8629 MS |
667 | /* Verify the data block size hasn't changed */ |
668 | if (le32_to_cpu(disk_super->data_block_size) != pmd->data_block_size) { | |
669 | DMERR("changing the data block size (from %u to %llu) is not supported", | |
670 | le32_to_cpu(disk_super->data_block_size), | |
671 | (unsigned long long)pmd->data_block_size); | |
672 | r = -EINVAL; | |
673 | goto bad_unlock_sblock; | |
674 | } | |
675 | ||
d73ec525 | 676 | r = __check_incompat_features(disk_super, pmd); |
0fa5b17b JT |
677 | if (r < 0) |
678 | goto bad_unlock_sblock; | |
d73ec525 | 679 | |
e4d2205c JT |
680 | r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
681 | disk_super->metadata_space_map_root, | |
682 | sizeof(disk_super->metadata_space_map_root), | |
683 | &pmd->tm, &pmd->metadata_sm); | |
684 | if (r < 0) { | |
685 | DMERR("tm_open_with_sm failed"); | |
0fa5b17b | 686 | goto bad_unlock_sblock; |
e4d2205c JT |
687 | } |
688 | ||
689 | pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root, | |
690 | sizeof(disk_super->data_space_map_root)); | |
691 | if (IS_ERR(pmd->data_sm)) { | |
692 | DMERR("sm_disk_open failed"); | |
e4d2205c | 693 | r = PTR_ERR(pmd->data_sm); |
0fa5b17b | 694 | goto bad_cleanup_tm; |
e4d2205c JT |
695 | } |
696 | ||
e4d2205c JT |
697 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
698 | if (!pmd->nb_tm) { | |
0fa5b17b | 699 | DMERR("could not create non-blocking clone tm"); |
e4d2205c | 700 | r = -ENOMEM; |
0fa5b17b | 701 | goto bad_cleanup_data_sm; |
e4d2205c JT |
702 | } |
703 | ||
704 | __setup_btree_details(pmd); | |
4c7da06f MP |
705 | dm_bm_unlock(sblock); |
706 | ||
707 | return 0; | |
e4d2205c | 708 | |
0fa5b17b | 709 | bad_cleanup_data_sm: |
e4d2205c | 710 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 711 | bad_cleanup_tm: |
e4d2205c JT |
712 | dm_tm_destroy(pmd->tm); |
713 | dm_sm_destroy(pmd->metadata_sm); | |
0fa5b17b JT |
714 | bad_unlock_sblock: |
715 | dm_bm_unlock(sblock); | |
e4d2205c JT |
716 | |
717 | return r; | |
718 | } | |
719 | ||
66b1edc0 | 720 | static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device) |
e4d2205c | 721 | { |
8801e069 | 722 | int r, unformatted; |
237074c0 | 723 | |
8801e069 | 724 | r = __superblock_all_zeroes(pmd->bm, &unformatted); |
237074c0 JT |
725 | if (r) |
726 | return r; | |
727 | ||
8801e069 | 728 | if (unformatted) |
66b1edc0 JT |
729 | return format_device ? __format_metadata(pmd) : -EPERM; |
730 | ||
731 | return __open_metadata(pmd); | |
e4d2205c JT |
732 | } |
733 | ||
66b1edc0 | 734 | static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device) |
332627db JT |
735 | { |
736 | int r; | |
737 | ||
7d48935e | 738 | pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT, |
332627db JT |
739 | THIN_MAX_CONCURRENT_LOCKS); |
740 | if (IS_ERR(pmd->bm)) { | |
741 | DMERR("could not create block manager"); | |
219403d7 YB |
742 | r = PTR_ERR(pmd->bm); |
743 | pmd->bm = NULL; | |
744 | return r; | |
332627db JT |
745 | } |
746 | ||
66b1edc0 | 747 | r = __open_or_format_metadata(pmd, format_device); |
219403d7 | 748 | if (r) { |
332627db | 749 | dm_block_manager_destroy(pmd->bm); |
219403d7 YB |
750 | pmd->bm = NULL; |
751 | } | |
332627db JT |
752 | |
753 | return r; | |
754 | } | |
755 | ||
f9dd9352 JT |
756 | static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd) |
757 | { | |
758 | dm_sm_destroy(pmd->data_sm); | |
759 | dm_sm_destroy(pmd->metadata_sm); | |
760 | dm_tm_destroy(pmd->nb_tm); | |
761 | dm_tm_destroy(pmd->tm); | |
762 | dm_block_manager_destroy(pmd->bm); | |
763 | } | |
764 | ||
991d9fa0 JT |
765 | static int __begin_transaction(struct dm_pool_metadata *pmd) |
766 | { | |
767 | int r; | |
991d9fa0 JT |
768 | struct thin_disk_superblock *disk_super; |
769 | struct dm_block *sblock; | |
770 | ||
991d9fa0 JT |
771 | /* |
772 | * We re-read the superblock every time. Shouldn't need to do this | |
773 | * really. | |
774 | */ | |
775 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
776 | &sb_validator, &sblock); | |
777 | if (r) | |
778 | return r; | |
779 | ||
780 | disk_super = dm_block_data(sblock); | |
781 | pmd->time = le32_to_cpu(disk_super->time); | |
782 | pmd->root = le64_to_cpu(disk_super->data_mapping_root); | |
783 | pmd->details_root = le64_to_cpu(disk_super->device_details_root); | |
784 | pmd->trans_id = le64_to_cpu(disk_super->trans_id); | |
785 | pmd->flags = le32_to_cpu(disk_super->flags); | |
786 | pmd->data_block_size = le32_to_cpu(disk_super->data_block_size); | |
787 | ||
991d9fa0 | 788 | dm_bm_unlock(sblock); |
d73ec525 | 789 | return 0; |
991d9fa0 JT |
790 | } |
791 | ||
792 | static int __write_changed_details(struct dm_pool_metadata *pmd) | |
793 | { | |
794 | int r; | |
795 | struct dm_thin_device *td, *tmp; | |
796 | struct disk_device_details details; | |
797 | uint64_t key; | |
798 | ||
799 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
800 | if (!td->changed) | |
801 | continue; | |
802 | ||
803 | key = td->id; | |
804 | ||
805 | details.mapped_blocks = cpu_to_le64(td->mapped_blocks); | |
806 | details.transaction_id = cpu_to_le64(td->transaction_id); | |
807 | details.creation_time = cpu_to_le32(td->creation_time); | |
808 | details.snapshotted_time = cpu_to_le32(td->snapshotted_time); | |
809 | __dm_bless_for_disk(&details); | |
810 | ||
811 | r = dm_btree_insert(&pmd->details_info, pmd->details_root, | |
812 | &key, &details, &pmd->details_root); | |
813 | if (r) | |
814 | return r; | |
815 | ||
816 | if (td->open_count) | |
63ee92d1 | 817 | td->changed = false; |
991d9fa0 JT |
818 | else { |
819 | list_del(&td->list); | |
820 | kfree(td); | |
821 | } | |
991d9fa0 JT |
822 | } |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | static int __commit_transaction(struct dm_pool_metadata *pmd) | |
828 | { | |
991d9fa0 | 829 | int r; |
991d9fa0 JT |
830 | struct thin_disk_superblock *disk_super; |
831 | struct dm_block *sblock; | |
832 | ||
833 | /* | |
834 | * We need to know if the thin_disk_superblock exceeds a 512-byte sector. | |
835 | */ | |
836 | BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512); | |
44d8ebf4 | 837 | BUG_ON(!rwsem_is_locked(&pmd->root_lock)); |
991d9fa0 | 838 | |
873f258b MS |
839 | if (unlikely(!pmd->in_service)) |
840 | return 0; | |
841 | ||
ecda7c02 NT |
842 | if (pmd->pre_commit_fn) { |
843 | r = pmd->pre_commit_fn(pmd->pre_commit_context); | |
844 | if (r < 0) { | |
845 | DMERR("pre-commit callback failed"); | |
846 | return r; | |
847 | } | |
848 | } | |
849 | ||
991d9fa0 JT |
850 | r = __write_changed_details(pmd); |
851 | if (r < 0) | |
d973ac19 | 852 | return r; |
991d9fa0 | 853 | |
991d9fa0 JT |
854 | r = dm_sm_commit(pmd->data_sm); |
855 | if (r < 0) | |
d973ac19 | 856 | return r; |
991d9fa0 JT |
857 | |
858 | r = dm_tm_pre_commit(pmd->tm); | |
859 | if (r < 0) | |
d973ac19 | 860 | return r; |
991d9fa0 | 861 | |
5a32083d JT |
862 | r = save_sm_roots(pmd); |
863 | if (r < 0) | |
864 | return r; | |
865 | ||
25971192 | 866 | r = superblock_lock(pmd, &sblock); |
991d9fa0 | 867 | if (r) |
d973ac19 | 868 | return r; |
991d9fa0 JT |
869 | |
870 | disk_super = dm_block_data(sblock); | |
871 | disk_super->time = cpu_to_le32(pmd->time); | |
872 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
873 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
874 | disk_super->trans_id = cpu_to_le64(pmd->trans_id); | |
875 | disk_super->flags = cpu_to_le32(pmd->flags); | |
876 | ||
5a32083d | 877 | copy_sm_roots(pmd, disk_super); |
991d9fa0 | 878 | |
eb04cf63 | 879 | return dm_tm_commit(pmd->tm, sblock); |
991d9fa0 JT |
880 | } |
881 | ||
3ab91828 JT |
882 | static void __set_metadata_reserve(struct dm_pool_metadata *pmd) |
883 | { | |
884 | int r; | |
885 | dm_block_t total; | |
886 | dm_block_t max_blocks = 4096; /* 16M */ | |
887 | ||
888 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, &total); | |
889 | if (r) { | |
890 | DMERR("could not get size of metadata device"); | |
891 | pmd->metadata_reserve = max_blocks; | |
013ad043 MS |
892 | } else |
893 | pmd->metadata_reserve = min(max_blocks, div_u64(total, 10)); | |
3ab91828 JT |
894 | } |
895 | ||
991d9fa0 | 896 | struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, |
66b1edc0 JT |
897 | sector_t data_block_size, |
898 | bool format_device) | |
991d9fa0 JT |
899 | { |
900 | int r; | |
991d9fa0 | 901 | struct dm_pool_metadata *pmd; |
991d9fa0 JT |
902 | |
903 | pmd = kmalloc(sizeof(*pmd), GFP_KERNEL); | |
904 | if (!pmd) { | |
905 | DMERR("could not allocate metadata struct"); | |
906 | return ERR_PTR(-ENOMEM); | |
907 | } | |
908 | ||
6a0ebd31 JT |
909 | init_rwsem(&pmd->root_lock); |
910 | pmd->time = 0; | |
911 | INIT_LIST_HEAD(&pmd->thin_devices); | |
da105ed5 | 912 | pmd->fail_io = false; |
873f258b | 913 | pmd->in_service = false; |
332627db | 914 | pmd->bdev = bdev; |
9cb6653f | 915 | pmd->data_block_size = data_block_size; |
ecda7c02 NT |
916 | pmd->pre_commit_fn = NULL; |
917 | pmd->pre_commit_context = NULL; | |
991d9fa0 | 918 | |
66b1edc0 | 919 | r = __create_persistent_data_objects(pmd, format_device); |
991d9fa0 | 920 | if (r) { |
991d9fa0 JT |
921 | kfree(pmd); |
922 | return ERR_PTR(r); | |
923 | } | |
991d9fa0 | 924 | |
270938ba JT |
925 | r = __begin_transaction(pmd); |
926 | if (r < 0) { | |
927 | if (dm_pool_metadata_close(pmd) < 0) | |
928 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); | |
929 | return ERR_PTR(r); | |
991d9fa0 JT |
930 | } |
931 | ||
3ab91828 JT |
932 | __set_metadata_reserve(pmd); |
933 | ||
991d9fa0 | 934 | return pmd; |
991d9fa0 JT |
935 | } |
936 | ||
937 | int dm_pool_metadata_close(struct dm_pool_metadata *pmd) | |
938 | { | |
939 | int r; | |
940 | unsigned open_devices = 0; | |
941 | struct dm_thin_device *td, *tmp; | |
942 | ||
943 | down_read(&pmd->root_lock); | |
944 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
945 | if (td->open_count) | |
946 | open_devices++; | |
947 | else { | |
948 | list_del(&td->list); | |
949 | kfree(td); | |
950 | } | |
951 | } | |
952 | up_read(&pmd->root_lock); | |
953 | ||
954 | if (open_devices) { | |
955 | DMERR("attempt to close pmd when %u device(s) are still open", | |
956 | open_devices); | |
957 | return -EBUSY; | |
958 | } | |
959 | ||
44d8ebf4 | 960 | pmd_write_lock_in_core(pmd); |
3a653b20 | 961 | if (!pmd->fail_io && !dm_bm_is_read_only(pmd->bm)) { |
12ba58af JT |
962 | r = __commit_transaction(pmd); |
963 | if (r < 0) | |
964 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
965 | __func__, r); | |
966 | } | |
3918e066 | 967 | pmd_write_unlock(pmd); |
da105ed5 JT |
968 | if (!pmd->fail_io) |
969 | __destroy_persistent_data_objects(pmd); | |
991d9fa0 | 970 | |
da105ed5 | 971 | kfree(pmd); |
991d9fa0 JT |
972 | return 0; |
973 | } | |
974 | ||
1f3db25d MS |
975 | /* |
976 | * __open_device: Returns @td corresponding to device with id @dev, | |
977 | * creating it if @create is set and incrementing @td->open_count. | |
978 | * On failure, @td is undefined. | |
979 | */ | |
991d9fa0 JT |
980 | static int __open_device(struct dm_pool_metadata *pmd, |
981 | dm_thin_id dev, int create, | |
982 | struct dm_thin_device **td) | |
983 | { | |
984 | int r, changed = 0; | |
985 | struct dm_thin_device *td2; | |
986 | uint64_t key = dev; | |
987 | struct disk_device_details details_le; | |
988 | ||
989 | /* | |
1f3db25d | 990 | * If the device is already open, return it. |
991d9fa0 JT |
991 | */ |
992 | list_for_each_entry(td2, &pmd->thin_devices, list) | |
993 | if (td2->id == dev) { | |
1f3db25d MS |
994 | /* |
995 | * May not create an already-open device. | |
996 | */ | |
997 | if (create) | |
998 | return -EEXIST; | |
999 | ||
991d9fa0 JT |
1000 | td2->open_count++; |
1001 | *td = td2; | |
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Check the device exists. | |
1007 | */ | |
1008 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
1009 | &key, &details_le); | |
1010 | if (r) { | |
1011 | if (r != -ENODATA || !create) | |
1012 | return r; | |
1013 | ||
1f3db25d MS |
1014 | /* |
1015 | * Create new device. | |
1016 | */ | |
991d9fa0 JT |
1017 | changed = 1; |
1018 | details_le.mapped_blocks = 0; | |
1019 | details_le.transaction_id = cpu_to_le64(pmd->trans_id); | |
1020 | details_le.creation_time = cpu_to_le32(pmd->time); | |
1021 | details_le.snapshotted_time = cpu_to_le32(pmd->time); | |
1022 | } | |
1023 | ||
1024 | *td = kmalloc(sizeof(**td), GFP_NOIO); | |
1025 | if (!*td) | |
1026 | return -ENOMEM; | |
1027 | ||
1028 | (*td)->pmd = pmd; | |
1029 | (*td)->id = dev; | |
1030 | (*td)->open_count = 1; | |
1031 | (*td)->changed = changed; | |
da105ed5 | 1032 | (*td)->aborted_with_changes = false; |
991d9fa0 JT |
1033 | (*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks); |
1034 | (*td)->transaction_id = le64_to_cpu(details_le.transaction_id); | |
1035 | (*td)->creation_time = le32_to_cpu(details_le.creation_time); | |
1036 | (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time); | |
1037 | ||
1038 | list_add(&(*td)->list, &pmd->thin_devices); | |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | static void __close_device(struct dm_thin_device *td) | |
1044 | { | |
1045 | --td->open_count; | |
1046 | } | |
1047 | ||
1048 | static int __create_thin(struct dm_pool_metadata *pmd, | |
1049 | dm_thin_id dev) | |
1050 | { | |
1051 | int r; | |
1052 | dm_block_t dev_root; | |
1053 | uint64_t key = dev; | |
991d9fa0 JT |
1054 | struct dm_thin_device *td; |
1055 | __le64 value; | |
1056 | ||
1057 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
399c9bdb | 1058 | &key, NULL); |
991d9fa0 JT |
1059 | if (!r) |
1060 | return -EEXIST; | |
1061 | ||
1062 | /* | |
1063 | * Create an empty btree for the mappings. | |
1064 | */ | |
1065 | r = dm_btree_empty(&pmd->bl_info, &dev_root); | |
1066 | if (r) | |
1067 | return r; | |
1068 | ||
1069 | /* | |
1070 | * Insert it into the main mapping tree. | |
1071 | */ | |
1072 | value = cpu_to_le64(dev_root); | |
1073 | __dm_bless_for_disk(&value); | |
1074 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1075 | if (r) { | |
1076 | dm_btree_del(&pmd->bl_info, dev_root); | |
1077 | return r; | |
1078 | } | |
1079 | ||
1080 | r = __open_device(pmd, dev, 1, &td); | |
1081 | if (r) { | |
991d9fa0 JT |
1082 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1083 | dm_btree_del(&pmd->bl_info, dev_root); | |
1084 | return r; | |
1085 | } | |
991d9fa0 JT |
1086 | __close_device(td); |
1087 | ||
1088 | return r; | |
1089 | } | |
1090 | ||
1091 | int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1092 | { | |
da105ed5 | 1093 | int r = -EINVAL; |
991d9fa0 | 1094 | |
6a1b1ddc | 1095 | pmd_write_lock(pmd); |
da105ed5 JT |
1096 | if (!pmd->fail_io) |
1097 | r = __create_thin(pmd, dev); | |
6a1b1ddc | 1098 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1099 | |
1100 | return r; | |
1101 | } | |
1102 | ||
1103 | static int __set_snapshot_details(struct dm_pool_metadata *pmd, | |
1104 | struct dm_thin_device *snap, | |
1105 | dm_thin_id origin, uint32_t time) | |
1106 | { | |
1107 | int r; | |
1108 | struct dm_thin_device *td; | |
1109 | ||
1110 | r = __open_device(pmd, origin, 0, &td); | |
1111 | if (r) | |
1112 | return r; | |
1113 | ||
63ee92d1 | 1114 | td->changed = true; |
991d9fa0 JT |
1115 | td->snapshotted_time = time; |
1116 | ||
1117 | snap->mapped_blocks = td->mapped_blocks; | |
1118 | snap->snapshotted_time = time; | |
1119 | __close_device(td); | |
1120 | ||
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | static int __create_snap(struct dm_pool_metadata *pmd, | |
1125 | dm_thin_id dev, dm_thin_id origin) | |
1126 | { | |
1127 | int r; | |
1128 | dm_block_t origin_root; | |
1129 | uint64_t key = origin, dev_key = dev; | |
1130 | struct dm_thin_device *td; | |
991d9fa0 JT |
1131 | __le64 value; |
1132 | ||
1133 | /* check this device is unused */ | |
1134 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
399c9bdb | 1135 | &dev_key, NULL); |
991d9fa0 JT |
1136 | if (!r) |
1137 | return -EEXIST; | |
1138 | ||
1139 | /* find the mapping tree for the origin */ | |
1140 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value); | |
1141 | if (r) | |
1142 | return r; | |
1143 | origin_root = le64_to_cpu(value); | |
1144 | ||
1145 | /* clone the origin, an inc will do */ | |
1146 | dm_tm_inc(pmd->tm, origin_root); | |
1147 | ||
1148 | /* insert into the main mapping tree */ | |
1149 | value = cpu_to_le64(origin_root); | |
1150 | __dm_bless_for_disk(&value); | |
1151 | key = dev; | |
1152 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1153 | if (r) { | |
1154 | dm_tm_dec(pmd->tm, origin_root); | |
1155 | return r; | |
1156 | } | |
1157 | ||
1158 | pmd->time++; | |
1159 | ||
1160 | r = __open_device(pmd, dev, 1, &td); | |
1161 | if (r) | |
1162 | goto bad; | |
1163 | ||
1164 | r = __set_snapshot_details(pmd, td, origin, pmd->time); | |
1f3db25d MS |
1165 | __close_device(td); |
1166 | ||
991d9fa0 JT |
1167 | if (r) |
1168 | goto bad; | |
1169 | ||
991d9fa0 JT |
1170 | return 0; |
1171 | ||
1172 | bad: | |
991d9fa0 JT |
1173 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1174 | dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1175 | &key, &pmd->details_root); | |
1176 | return r; | |
1177 | } | |
1178 | ||
1179 | int dm_pool_create_snap(struct dm_pool_metadata *pmd, | |
1180 | dm_thin_id dev, | |
1181 | dm_thin_id origin) | |
1182 | { | |
da105ed5 | 1183 | int r = -EINVAL; |
991d9fa0 | 1184 | |
6a1b1ddc | 1185 | pmd_write_lock(pmd); |
da105ed5 JT |
1186 | if (!pmd->fail_io) |
1187 | r = __create_snap(pmd, dev, origin); | |
6a1b1ddc | 1188 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1189 | |
1190 | return r; | |
1191 | } | |
1192 | ||
1193 | static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1194 | { | |
1195 | int r; | |
1196 | uint64_t key = dev; | |
1197 | struct dm_thin_device *td; | |
1198 | ||
1199 | /* TODO: failure should mark the transaction invalid */ | |
1200 | r = __open_device(pmd, dev, 0, &td); | |
1201 | if (r) | |
1202 | return r; | |
1203 | ||
1204 | if (td->open_count > 1) { | |
1205 | __close_device(td); | |
1206 | return -EBUSY; | |
1207 | } | |
1208 | ||
1209 | list_del(&td->list); | |
1210 | kfree(td); | |
1211 | r = dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1212 | &key, &pmd->details_root); | |
1213 | if (r) | |
1214 | return r; | |
1215 | ||
1216 | r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); | |
1217 | if (r) | |
1218 | return r; | |
1219 | ||
991d9fa0 JT |
1220 | return 0; |
1221 | } | |
1222 | ||
1223 | int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, | |
1224 | dm_thin_id dev) | |
1225 | { | |
da105ed5 | 1226 | int r = -EINVAL; |
991d9fa0 | 1227 | |
6a1b1ddc | 1228 | pmd_write_lock(pmd); |
da105ed5 JT |
1229 | if (!pmd->fail_io) |
1230 | r = __delete_device(pmd, dev); | |
6a1b1ddc | 1231 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1232 | |
1233 | return r; | |
1234 | } | |
1235 | ||
1236 | int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1237 | uint64_t current_id, | |
1238 | uint64_t new_id) | |
1239 | { | |
da105ed5 JT |
1240 | int r = -EINVAL; |
1241 | ||
6a1b1ddc | 1242 | pmd_write_lock(pmd); |
da105ed5 JT |
1243 | |
1244 | if (pmd->fail_io) | |
1245 | goto out; | |
1246 | ||
991d9fa0 | 1247 | if (pmd->trans_id != current_id) { |
991d9fa0 | 1248 | DMERR("mismatched transaction id"); |
da105ed5 | 1249 | goto out; |
991d9fa0 JT |
1250 | } |
1251 | ||
1252 | pmd->trans_id = new_id; | |
da105ed5 JT |
1253 | r = 0; |
1254 | ||
1255 | out: | |
6a1b1ddc | 1256 | pmd_write_unlock(pmd); |
991d9fa0 | 1257 | |
da105ed5 | 1258 | return r; |
991d9fa0 JT |
1259 | } |
1260 | ||
1261 | int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1262 | uint64_t *result) | |
1263 | { | |
da105ed5 JT |
1264 | int r = -EINVAL; |
1265 | ||
991d9fa0 | 1266 | down_read(&pmd->root_lock); |
da105ed5 JT |
1267 | if (!pmd->fail_io) { |
1268 | *result = pmd->trans_id; | |
1269 | r = 0; | |
1270 | } | |
991d9fa0 JT |
1271 | up_read(&pmd->root_lock); |
1272 | ||
da105ed5 | 1273 | return r; |
991d9fa0 JT |
1274 | } |
1275 | ||
cc8394d8 JT |
1276 | static int __reserve_metadata_snap(struct dm_pool_metadata *pmd) |
1277 | { | |
1278 | int r, inc; | |
1279 | struct thin_disk_superblock *disk_super; | |
1280 | struct dm_block *copy, *sblock; | |
1281 | dm_block_t held_root; | |
1282 | ||
49e99fc7 JT |
1283 | /* |
1284 | * We commit to ensure the btree roots which we increment in a | |
1285 | * moment are up to date. | |
1286 | */ | |
a1ed4d9e MS |
1287 | r = __commit_transaction(pmd); |
1288 | if (r < 0) { | |
1289 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
1290 | __func__, r); | |
1291 | return r; | |
1292 | } | |
49e99fc7 | 1293 | |
cc8394d8 JT |
1294 | /* |
1295 | * Copy the superblock. | |
1296 | */ | |
1297 | dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION); | |
1298 | r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION, | |
1299 | &sb_validator, ©, &inc); | |
1300 | if (r) | |
1301 | return r; | |
1302 | ||
1303 | BUG_ON(!inc); | |
1304 | ||
1305 | held_root = dm_block_location(copy); | |
1306 | disk_super = dm_block_data(copy); | |
1307 | ||
1308 | if (le64_to_cpu(disk_super->held_root)) { | |
1309 | DMWARN("Pool metadata snapshot already exists: release this before taking another."); | |
1310 | ||
1311 | dm_tm_dec(pmd->tm, held_root); | |
1312 | dm_tm_unlock(pmd->tm, copy); | |
cc8394d8 JT |
1313 | return -EBUSY; |
1314 | } | |
1315 | ||
1316 | /* | |
1317 | * Wipe the spacemap since we're not publishing this. | |
1318 | */ | |
1319 | memset(&disk_super->data_space_map_root, 0, | |
1320 | sizeof(disk_super->data_space_map_root)); | |
1321 | memset(&disk_super->metadata_space_map_root, 0, | |
1322 | sizeof(disk_super->metadata_space_map_root)); | |
1323 | ||
1324 | /* | |
1325 | * Increment the data structures that need to be preserved. | |
1326 | */ | |
1327 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root)); | |
1328 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root)); | |
1329 | dm_tm_unlock(pmd->tm, copy); | |
1330 | ||
1331 | /* | |
1332 | * Write the held root into the superblock. | |
1333 | */ | |
25971192 | 1334 | r = superblock_lock(pmd, &sblock); |
cc8394d8 JT |
1335 | if (r) { |
1336 | dm_tm_dec(pmd->tm, held_root); | |
cc8394d8 JT |
1337 | return r; |
1338 | } | |
1339 | ||
1340 | disk_super = dm_block_data(sblock); | |
1341 | disk_super->held_root = cpu_to_le64(held_root); | |
1342 | dm_bm_unlock(sblock); | |
cc8394d8 JT |
1343 | return 0; |
1344 | } | |
1345 | ||
1346 | int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd) | |
1347 | { | |
da105ed5 | 1348 | int r = -EINVAL; |
cc8394d8 | 1349 | |
6a1b1ddc | 1350 | pmd_write_lock(pmd); |
da105ed5 JT |
1351 | if (!pmd->fail_io) |
1352 | r = __reserve_metadata_snap(pmd); | |
6a1b1ddc | 1353 | pmd_write_unlock(pmd); |
cc8394d8 JT |
1354 | |
1355 | return r; | |
1356 | } | |
1357 | ||
1358 | static int __release_metadata_snap(struct dm_pool_metadata *pmd) | |
991d9fa0 JT |
1359 | { |
1360 | int r; | |
1361 | struct thin_disk_superblock *disk_super; | |
cc8394d8 JT |
1362 | struct dm_block *sblock, *copy; |
1363 | dm_block_t held_root; | |
991d9fa0 | 1364 | |
25971192 | 1365 | r = superblock_lock(pmd, &sblock); |
991d9fa0 JT |
1366 | if (r) |
1367 | return r; | |
1368 | ||
cc8394d8 JT |
1369 | disk_super = dm_block_data(sblock); |
1370 | held_root = le64_to_cpu(disk_super->held_root); | |
1371 | disk_super->held_root = cpu_to_le64(0); | |
cc8394d8 JT |
1372 | |
1373 | dm_bm_unlock(sblock); | |
1374 | ||
1375 | if (!held_root) { | |
1376 | DMWARN("No pool metadata snapshot found: nothing to release."); | |
1377 | return -EINVAL; | |
1378 | } | |
1379 | ||
1380 | r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, ©); | |
1381 | if (r) | |
1382 | return r; | |
1383 | ||
1384 | disk_super = dm_block_data(copy); | |
7f518ad0 JT |
1385 | dm_btree_del(&pmd->info, le64_to_cpu(disk_super->data_mapping_root)); |
1386 | dm_btree_del(&pmd->details_info, le64_to_cpu(disk_super->device_details_root)); | |
cc8394d8 JT |
1387 | dm_sm_dec_block(pmd->metadata_sm, held_root); |
1388 | ||
4c7da06f MP |
1389 | dm_tm_unlock(pmd->tm, copy); |
1390 | ||
1391 | return 0; | |
cc8394d8 JT |
1392 | } |
1393 | ||
1394 | int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd) | |
1395 | { | |
da105ed5 | 1396 | int r = -EINVAL; |
cc8394d8 | 1397 | |
6a1b1ddc | 1398 | pmd_write_lock(pmd); |
da105ed5 JT |
1399 | if (!pmd->fail_io) |
1400 | r = __release_metadata_snap(pmd); | |
6a1b1ddc | 1401 | pmd_write_unlock(pmd); |
cc8394d8 JT |
1402 | |
1403 | return r; | |
1404 | } | |
1405 | ||
1406 | static int __get_metadata_snap(struct dm_pool_metadata *pmd, | |
1407 | dm_block_t *result) | |
1408 | { | |
1409 | int r; | |
1410 | struct thin_disk_superblock *disk_super; | |
1411 | struct dm_block *sblock; | |
1412 | ||
1413 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
1414 | &sb_validator, &sblock); | |
1415 | if (r) | |
1416 | return r; | |
1417 | ||
991d9fa0 JT |
1418 | disk_super = dm_block_data(sblock); |
1419 | *result = le64_to_cpu(disk_super->held_root); | |
1420 | ||
4c7da06f MP |
1421 | dm_bm_unlock(sblock); |
1422 | ||
1423 | return 0; | |
991d9fa0 JT |
1424 | } |
1425 | ||
cc8394d8 JT |
1426 | int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd, |
1427 | dm_block_t *result) | |
991d9fa0 | 1428 | { |
da105ed5 | 1429 | int r = -EINVAL; |
991d9fa0 JT |
1430 | |
1431 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1432 | if (!pmd->fail_io) |
1433 | r = __get_metadata_snap(pmd, result); | |
991d9fa0 JT |
1434 | up_read(&pmd->root_lock); |
1435 | ||
1436 | return r; | |
1437 | } | |
1438 | ||
1439 | int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, | |
1440 | struct dm_thin_device **td) | |
1441 | { | |
da105ed5 | 1442 | int r = -EINVAL; |
991d9fa0 | 1443 | |
6a1b1ddc | 1444 | pmd_write_lock_in_core(pmd); |
da105ed5 JT |
1445 | if (!pmd->fail_io) |
1446 | r = __open_device(pmd, dev, 0, td); | |
6a1b1ddc | 1447 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1448 | |
1449 | return r; | |
1450 | } | |
1451 | ||
1452 | int dm_pool_close_thin_device(struct dm_thin_device *td) | |
1453 | { | |
6a1b1ddc | 1454 | pmd_write_lock_in_core(td->pmd); |
991d9fa0 | 1455 | __close_device(td); |
6a1b1ddc | 1456 | pmd_write_unlock(td->pmd); |
991d9fa0 JT |
1457 | |
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | dm_thin_id dm_thin_dev_id(struct dm_thin_device *td) | |
1462 | { | |
1463 | return td->id; | |
1464 | } | |
1465 | ||
19fa1a67 JT |
1466 | /* |
1467 | * Check whether @time (of block creation) is older than @td's last snapshot. | |
1468 | * If so then the associated block is shared with the last snapshot device. | |
1469 | * Any block on a device created *after* the device last got snapshotted is | |
1470 | * necessarily not shared. | |
1471 | */ | |
17b7d63f | 1472 | static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time) |
991d9fa0 JT |
1473 | { |
1474 | return td->snapshotted_time > time; | |
1475 | } | |
1476 | ||
3d5f6733 JT |
1477 | static void unpack_lookup_result(struct dm_thin_device *td, __le64 value, |
1478 | struct dm_thin_lookup_result *result) | |
1479 | { | |
1480 | uint64_t block_time = 0; | |
1481 | dm_block_t exception_block; | |
1482 | uint32_t exception_time; | |
1483 | ||
1484 | block_time = le64_to_cpu(value); | |
1485 | unpack_block_time(block_time, &exception_block, &exception_time); | |
1486 | result->block = exception_block; | |
1487 | result->shared = __snapshotted_since(td, exception_time); | |
1488 | } | |
1489 | ||
086fbbbd JT |
1490 | static int __find_block(struct dm_thin_device *td, dm_block_t block, |
1491 | int can_issue_io, struct dm_thin_lookup_result *result) | |
991d9fa0 | 1492 | { |
e5cfc69a | 1493 | int r; |
991d9fa0 JT |
1494 | __le64 value; |
1495 | struct dm_pool_metadata *pmd = td->pmd; | |
1496 | dm_block_t keys[2] = { td->id, block }; | |
da105ed5 | 1497 | struct dm_btree_info *info; |
991d9fa0 | 1498 | |
e5cfc69a JT |
1499 | if (can_issue_io) { |
1500 | info = &pmd->info; | |
1501 | } else | |
1502 | info = &pmd->nb_info; | |
da105ed5 | 1503 | |
e5cfc69a | 1504 | r = dm_btree_lookup(info, pmd->root, keys, &value); |
3d5f6733 JT |
1505 | if (!r) |
1506 | unpack_lookup_result(td, value, result); | |
1507 | ||
3d5f6733 JT |
1508 | return r; |
1509 | } | |
1510 | ||
086fbbbd JT |
1511 | int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, |
1512 | int can_issue_io, struct dm_thin_lookup_result *result) | |
3d5f6733 JT |
1513 | { |
1514 | int r; | |
3d5f6733 | 1515 | struct dm_pool_metadata *pmd = td->pmd; |
3d5f6733 JT |
1516 | |
1517 | down_read(&pmd->root_lock); | |
1518 | if (pmd->fail_io) { | |
1519 | up_read(&pmd->root_lock); | |
1520 | return -EINVAL; | |
991d9fa0 JT |
1521 | } |
1522 | ||
086fbbbd JT |
1523 | r = __find_block(td, block, can_issue_io, result); |
1524 | ||
1525 | up_read(&pmd->root_lock); | |
1526 | return r; | |
1527 | } | |
1528 | ||
1529 | static int __find_next_mapped_block(struct dm_thin_device *td, dm_block_t block, | |
1530 | dm_block_t *vblock, | |
1531 | struct dm_thin_lookup_result *result) | |
1532 | { | |
1533 | int r; | |
1534 | __le64 value; | |
1535 | struct dm_pool_metadata *pmd = td->pmd; | |
1536 | dm_block_t keys[2] = { td->id, block }; | |
1537 | ||
3d5f6733 JT |
1538 | r = dm_btree_lookup_next(&pmd->info, pmd->root, keys, vblock, &value); |
1539 | if (!r) | |
1540 | unpack_lookup_result(td, value, result); | |
1541 | ||
991d9fa0 JT |
1542 | return r; |
1543 | } | |
1544 | ||
086fbbbd JT |
1545 | static int __find_mapped_range(struct dm_thin_device *td, |
1546 | dm_block_t begin, dm_block_t end, | |
1547 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1548 | dm_block_t *pool_begin, bool *maybe_shared) | |
a5d895a9 JT |
1549 | { |
1550 | int r; | |
1551 | dm_block_t pool_end; | |
1552 | struct dm_thin_lookup_result lookup; | |
1553 | ||
1554 | if (end < begin) | |
1555 | return -ENODATA; | |
1556 | ||
086fbbbd | 1557 | r = __find_next_mapped_block(td, begin, &begin, &lookup); |
3d5f6733 JT |
1558 | if (r) |
1559 | return r; | |
a5d895a9 | 1560 | |
3d5f6733 | 1561 | if (begin >= end) |
a5d895a9 JT |
1562 | return -ENODATA; |
1563 | ||
1564 | *thin_begin = begin; | |
1565 | *pool_begin = lookup.block; | |
1566 | *maybe_shared = lookup.shared; | |
1567 | ||
1568 | begin++; | |
1569 | pool_end = *pool_begin + 1; | |
1570 | while (begin != end) { | |
086fbbbd | 1571 | r = __find_block(td, begin, true, &lookup); |
a5d895a9 JT |
1572 | if (r) { |
1573 | if (r == -ENODATA) | |
1574 | break; | |
1575 | else | |
1576 | return r; | |
1577 | } | |
1578 | ||
1579 | if ((lookup.block != pool_end) || | |
1580 | (lookup.shared != *maybe_shared)) | |
1581 | break; | |
1582 | ||
1583 | pool_end++; | |
1584 | begin++; | |
1585 | } | |
1586 | ||
1587 | *thin_end = begin; | |
1588 | return 0; | |
1589 | } | |
1590 | ||
086fbbbd JT |
1591 | int dm_thin_find_mapped_range(struct dm_thin_device *td, |
1592 | dm_block_t begin, dm_block_t end, | |
1593 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1594 | dm_block_t *pool_begin, bool *maybe_shared) | |
1595 | { | |
1596 | int r = -EINVAL; | |
1597 | struct dm_pool_metadata *pmd = td->pmd; | |
1598 | ||
1599 | down_read(&pmd->root_lock); | |
1600 | if (!pmd->fail_io) { | |
1601 | r = __find_mapped_range(td, begin, end, thin_begin, thin_end, | |
1602 | pool_begin, maybe_shared); | |
1603 | } | |
1604 | up_read(&pmd->root_lock); | |
1605 | ||
1606 | return r; | |
1607 | } | |
1608 | ||
991d9fa0 JT |
1609 | static int __insert(struct dm_thin_device *td, dm_block_t block, |
1610 | dm_block_t data_block) | |
1611 | { | |
1612 | int r, inserted; | |
1613 | __le64 value; | |
1614 | struct dm_pool_metadata *pmd = td->pmd; | |
1615 | dm_block_t keys[2] = { td->id, block }; | |
1616 | ||
991d9fa0 JT |
1617 | value = cpu_to_le64(pack_block_time(data_block, pmd->time)); |
1618 | __dm_bless_for_disk(&value); | |
1619 | ||
1620 | r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value, | |
1621 | &pmd->root, &inserted); | |
1622 | if (r) | |
1623 | return r; | |
1624 | ||
63ee92d1 | 1625 | td->changed = true; |
40db5a53 | 1626 | if (inserted) |
991d9fa0 | 1627 | td->mapped_blocks++; |
991d9fa0 JT |
1628 | |
1629 | return 0; | |
1630 | } | |
1631 | ||
1632 | int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, | |
1633 | dm_block_t data_block) | |
1634 | { | |
da105ed5 | 1635 | int r = -EINVAL; |
991d9fa0 | 1636 | |
6a1b1ddc | 1637 | pmd_write_lock(td->pmd); |
da105ed5 JT |
1638 | if (!td->pmd->fail_io) |
1639 | r = __insert(td, block, data_block); | |
6a1b1ddc | 1640 | pmd_write_unlock(td->pmd); |
991d9fa0 JT |
1641 | |
1642 | return r; | |
1643 | } | |
1644 | ||
1645 | static int __remove(struct dm_thin_device *td, dm_block_t block) | |
1646 | { | |
1647 | int r; | |
1648 | struct dm_pool_metadata *pmd = td->pmd; | |
1649 | dm_block_t keys[2] = { td->id, block }; | |
1650 | ||
1651 | r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root); | |
1652 | if (r) | |
1653 | return r; | |
1654 | ||
af63bcb8 | 1655 | td->mapped_blocks--; |
63ee92d1 | 1656 | td->changed = true; |
991d9fa0 JT |
1657 | |
1658 | return 0; | |
1659 | } | |
1660 | ||
6550f075 JT |
1661 | static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end) |
1662 | { | |
1663 | int r; | |
993ceab9 | 1664 | unsigned count, total_count = 0; |
6550f075 JT |
1665 | struct dm_pool_metadata *pmd = td->pmd; |
1666 | dm_block_t keys[1] = { td->id }; | |
1667 | __le64 value; | |
1668 | dm_block_t mapping_root; | |
1669 | ||
1670 | /* | |
1671 | * Find the mapping tree | |
1672 | */ | |
1673 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value); | |
1674 | if (r) | |
1675 | return r; | |
1676 | ||
1677 | /* | |
1678 | * Remove from the mapping tree, taking care to inc the | |
1679 | * ref count so it doesn't get deleted. | |
1680 | */ | |
1681 | mapping_root = le64_to_cpu(value); | |
1682 | dm_tm_inc(pmd->tm, mapping_root); | |
1683 | r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root); | |
1684 | if (r) | |
1685 | return r; | |
1686 | ||
993ceab9 JT |
1687 | /* |
1688 | * Remove leaves stops at the first unmapped entry, so we have to | |
1689 | * loop round finding mapped ranges. | |
1690 | */ | |
1691 | while (begin < end) { | |
1692 | r = dm_btree_lookup_next(&pmd->bl_info, mapping_root, &begin, &begin, &value); | |
1693 | if (r == -ENODATA) | |
1694 | break; | |
1695 | ||
1696 | if (r) | |
1697 | return r; | |
1698 | ||
1699 | if (begin >= end) | |
1700 | break; | |
1701 | ||
1702 | r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count); | |
1703 | if (r) | |
1704 | return r; | |
1705 | ||
1706 | total_count += count; | |
1707 | } | |
6550f075 | 1708 | |
993ceab9 | 1709 | td->mapped_blocks -= total_count; |
63ee92d1 | 1710 | td->changed = true; |
6550f075 JT |
1711 | |
1712 | /* | |
1713 | * Reinsert the mapping tree. | |
1714 | */ | |
1715 | value = cpu_to_le64(mapping_root); | |
1716 | __dm_bless_for_disk(&value); | |
1717 | return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root); | |
1718 | } | |
1719 | ||
991d9fa0 JT |
1720 | int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) |
1721 | { | |
da105ed5 | 1722 | int r = -EINVAL; |
991d9fa0 | 1723 | |
6a1b1ddc | 1724 | pmd_write_lock(td->pmd); |
da105ed5 JT |
1725 | if (!td->pmd->fail_io) |
1726 | r = __remove(td, block); | |
6a1b1ddc | 1727 | pmd_write_unlock(td->pmd); |
19fa1a67 JT |
1728 | |
1729 | return r; | |
1730 | } | |
1731 | ||
6550f075 JT |
1732 | int dm_thin_remove_range(struct dm_thin_device *td, |
1733 | dm_block_t begin, dm_block_t end) | |
1734 | { | |
1735 | int r = -EINVAL; | |
1736 | ||
6a1b1ddc | 1737 | pmd_write_lock(td->pmd); |
6550f075 JT |
1738 | if (!td->pmd->fail_io) |
1739 | r = __remove_range(td, begin, end); | |
6a1b1ddc | 1740 | pmd_write_unlock(td->pmd); |
6550f075 JT |
1741 | |
1742 | return r; | |
1743 | } | |
1744 | ||
d445bd9c | 1745 | int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) |
19fa1a67 JT |
1746 | { |
1747 | int r; | |
1748 | uint32_t ref_count; | |
1749 | ||
1750 | down_read(&pmd->root_lock); | |
1751 | r = dm_sm_get_count(pmd->data_sm, b, &ref_count); | |
1752 | if (!r) | |
d445bd9c | 1753 | *result = (ref_count > 1); |
19fa1a67 | 1754 | up_read(&pmd->root_lock); |
991d9fa0 JT |
1755 | |
1756 | return r; | |
1757 | } | |
1758 | ||
2a0fbffb JT |
1759 | int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) |
1760 | { | |
1761 | int r = 0; | |
1762 | ||
6a1b1ddc | 1763 | pmd_write_lock(pmd); |
2a0fbffb JT |
1764 | for (; b != e; b++) { |
1765 | r = dm_sm_inc_block(pmd->data_sm, b); | |
1766 | if (r) | |
1767 | break; | |
1768 | } | |
6a1b1ddc | 1769 | pmd_write_unlock(pmd); |
2a0fbffb JT |
1770 | |
1771 | return r; | |
1772 | } | |
1773 | ||
1774 | int dm_pool_dec_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) | |
1775 | { | |
1776 | int r = 0; | |
1777 | ||
6a1b1ddc | 1778 | pmd_write_lock(pmd); |
2a0fbffb JT |
1779 | for (; b != e; b++) { |
1780 | r = dm_sm_dec_block(pmd->data_sm, b); | |
1781 | if (r) | |
1782 | break; | |
1783 | } | |
6a1b1ddc | 1784 | pmd_write_unlock(pmd); |
2a0fbffb JT |
1785 | |
1786 | return r; | |
1787 | } | |
1788 | ||
40db5a53 JT |
1789 | bool dm_thin_changed_this_transaction(struct dm_thin_device *td) |
1790 | { | |
1791 | int r; | |
1792 | ||
1793 | down_read(&td->pmd->root_lock); | |
1794 | r = td->changed; | |
1795 | up_read(&td->pmd->root_lock); | |
1796 | ||
1797 | return r; | |
1798 | } | |
1799 | ||
4d1662a3 MS |
1800 | bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd) |
1801 | { | |
1802 | bool r = false; | |
1803 | struct dm_thin_device *td, *tmp; | |
1804 | ||
1805 | down_read(&pmd->root_lock); | |
1806 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
1807 | if (td->changed) { | |
1808 | r = td->changed; | |
1809 | break; | |
1810 | } | |
1811 | } | |
1812 | up_read(&pmd->root_lock); | |
1813 | ||
1814 | return r; | |
1815 | } | |
1816 | ||
da105ed5 JT |
1817 | bool dm_thin_aborted_changes(struct dm_thin_device *td) |
1818 | { | |
1819 | bool r; | |
1820 | ||
1821 | down_read(&td->pmd->root_lock); | |
1822 | r = td->aborted_with_changes; | |
1823 | up_read(&td->pmd->root_lock); | |
1824 | ||
1825 | return r; | |
1826 | } | |
1827 | ||
991d9fa0 JT |
1828 | int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result) |
1829 | { | |
da105ed5 | 1830 | int r = -EINVAL; |
991d9fa0 | 1831 | |
6a1b1ddc | 1832 | pmd_write_lock(pmd); |
da105ed5 JT |
1833 | if (!pmd->fail_io) |
1834 | r = dm_sm_new_block(pmd->data_sm, result); | |
6a1b1ddc | 1835 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1836 | |
1837 | return r; | |
1838 | } | |
1839 | ||
1840 | int dm_pool_commit_metadata(struct dm_pool_metadata *pmd) | |
1841 | { | |
da105ed5 | 1842 | int r = -EINVAL; |
991d9fa0 | 1843 | |
873f258b MS |
1844 | /* |
1845 | * Care is taken to not have commit be what | |
1846 | * triggers putting the thin-pool in-service. | |
1847 | */ | |
44d8ebf4 | 1848 | pmd_write_lock_in_core(pmd); |
da105ed5 JT |
1849 | if (pmd->fail_io) |
1850 | goto out; | |
991d9fa0 JT |
1851 | |
1852 | r = __commit_transaction(pmd); | |
873f258b | 1853 | if (r < 0) |
991d9fa0 JT |
1854 | goto out; |
1855 | ||
1856 | /* | |
1857 | * Open the next transaction. | |
1858 | */ | |
1859 | r = __begin_transaction(pmd); | |
1860 | out: | |
6a1b1ddc | 1861 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1862 | return r; |
1863 | } | |
1864 | ||
da105ed5 JT |
1865 | static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd) |
1866 | { | |
1867 | struct dm_thin_device *td; | |
1868 | ||
1869 | list_for_each_entry(td, &pmd->thin_devices, list) | |
1870 | td->aborted_with_changes = td->changed; | |
1871 | } | |
1872 | ||
1873 | int dm_pool_abort_metadata(struct dm_pool_metadata *pmd) | |
1874 | { | |
1875 | int r = -EINVAL; | |
1876 | ||
6a1b1ddc | 1877 | pmd_write_lock(pmd); |
da105ed5 JT |
1878 | if (pmd->fail_io) |
1879 | goto out; | |
1880 | ||
1881 | __set_abort_with_changes_flags(pmd); | |
1882 | __destroy_persistent_data_objects(pmd); | |
1883 | r = __create_persistent_data_objects(pmd, false); | |
1884 | if (r) | |
1885 | pmd->fail_io = true; | |
1886 | ||
1887 | out: | |
6a1b1ddc | 1888 | pmd_write_unlock(pmd); |
da105ed5 JT |
1889 | |
1890 | return r; | |
1891 | } | |
1892 | ||
991d9fa0 JT |
1893 | int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result) |
1894 | { | |
da105ed5 | 1895 | int r = -EINVAL; |
991d9fa0 JT |
1896 | |
1897 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1898 | if (!pmd->fail_io) |
1899 | r = dm_sm_get_nr_free(pmd->data_sm, result); | |
991d9fa0 JT |
1900 | up_read(&pmd->root_lock); |
1901 | ||
1902 | return r; | |
1903 | } | |
1904 | ||
1905 | int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, | |
1906 | dm_block_t *result) | |
1907 | { | |
da105ed5 | 1908 | int r = -EINVAL; |
991d9fa0 JT |
1909 | |
1910 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1911 | if (!pmd->fail_io) |
1912 | r = dm_sm_get_nr_free(pmd->metadata_sm, result); | |
3ab91828 JT |
1913 | |
1914 | if (!r) { | |
1915 | if (*result < pmd->metadata_reserve) | |
1916 | *result = 0; | |
1917 | else | |
1918 | *result -= pmd->metadata_reserve; | |
1919 | } | |
991d9fa0 JT |
1920 | up_read(&pmd->root_lock); |
1921 | ||
1922 | return r; | |
1923 | } | |
1924 | ||
1925 | int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, | |
1926 | dm_block_t *result) | |
1927 | { | |
da105ed5 | 1928 | int r = -EINVAL; |
991d9fa0 JT |
1929 | |
1930 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1931 | if (!pmd->fail_io) |
1932 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, result); | |
991d9fa0 JT |
1933 | up_read(&pmd->root_lock); |
1934 | ||
1935 | return r; | |
1936 | } | |
1937 | ||
991d9fa0 JT |
1938 | int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result) |
1939 | { | |
da105ed5 | 1940 | int r = -EINVAL; |
991d9fa0 JT |
1941 | |
1942 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1943 | if (!pmd->fail_io) |
1944 | r = dm_sm_get_nr_blocks(pmd->data_sm, result); | |
991d9fa0 JT |
1945 | up_read(&pmd->root_lock); |
1946 | ||
1947 | return r; | |
1948 | } | |
1949 | ||
1950 | int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result) | |
1951 | { | |
da105ed5 | 1952 | int r = -EINVAL; |
991d9fa0 JT |
1953 | struct dm_pool_metadata *pmd = td->pmd; |
1954 | ||
1955 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1956 | if (!pmd->fail_io) { |
1957 | *result = td->mapped_blocks; | |
1958 | r = 0; | |
1959 | } | |
991d9fa0 JT |
1960 | up_read(&pmd->root_lock); |
1961 | ||
da105ed5 | 1962 | return r; |
991d9fa0 JT |
1963 | } |
1964 | ||
1965 | static int __highest_block(struct dm_thin_device *td, dm_block_t *result) | |
1966 | { | |
1967 | int r; | |
1968 | __le64 value_le; | |
1969 | dm_block_t thin_root; | |
1970 | struct dm_pool_metadata *pmd = td->pmd; | |
1971 | ||
1972 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le); | |
1973 | if (r) | |
1974 | return r; | |
1975 | ||
1976 | thin_root = le64_to_cpu(value_le); | |
1977 | ||
1978 | return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result); | |
1979 | } | |
1980 | ||
1981 | int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, | |
1982 | dm_block_t *result) | |
1983 | { | |
da105ed5 | 1984 | int r = -EINVAL; |
991d9fa0 JT |
1985 | struct dm_pool_metadata *pmd = td->pmd; |
1986 | ||
1987 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1988 | if (!pmd->fail_io) |
1989 | r = __highest_block(td, result); | |
991d9fa0 JT |
1990 | up_read(&pmd->root_lock); |
1991 | ||
1992 | return r; | |
1993 | } | |
1994 | ||
b17446df | 1995 | static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count) |
991d9fa0 JT |
1996 | { |
1997 | int r; | |
1998 | dm_block_t old_count; | |
1999 | ||
b17446df | 2000 | r = dm_sm_get_nr_blocks(sm, &old_count); |
991d9fa0 JT |
2001 | if (r) |
2002 | return r; | |
2003 | ||
2004 | if (new_count == old_count) | |
2005 | return 0; | |
2006 | ||
2007 | if (new_count < old_count) { | |
b17446df | 2008 | DMERR("cannot reduce size of space map"); |
991d9fa0 JT |
2009 | return -EINVAL; |
2010 | } | |
2011 | ||
b17446df | 2012 | return dm_sm_extend(sm, new_count - old_count); |
991d9fa0 JT |
2013 | } |
2014 | ||
2015 | int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) | |
2016 | { | |
da105ed5 | 2017 | int r = -EINVAL; |
991d9fa0 | 2018 | |
6a1b1ddc | 2019 | pmd_write_lock(pmd); |
da105ed5 | 2020 | if (!pmd->fail_io) |
b17446df | 2021 | r = __resize_space_map(pmd->data_sm, new_count); |
6a1b1ddc | 2022 | pmd_write_unlock(pmd); |
991d9fa0 JT |
2023 | |
2024 | return r; | |
2025 | } | |
12ba58af | 2026 | |
24347e95 JT |
2027 | int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) |
2028 | { | |
2029 | int r = -EINVAL; | |
2030 | ||
6a1b1ddc | 2031 | pmd_write_lock(pmd); |
3ab91828 | 2032 | if (!pmd->fail_io) { |
24347e95 | 2033 | r = __resize_space_map(pmd->metadata_sm, new_count); |
3ab91828 JT |
2034 | if (!r) |
2035 | __set_metadata_reserve(pmd); | |
2036 | } | |
6a1b1ddc | 2037 | pmd_write_unlock(pmd); |
24347e95 JT |
2038 | |
2039 | return r; | |
2040 | } | |
2041 | ||
12ba58af JT |
2042 | void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) |
2043 | { | |
6a1b1ddc | 2044 | pmd_write_lock_in_core(pmd); |
12ba58af | 2045 | dm_bm_set_read_only(pmd->bm); |
6a1b1ddc | 2046 | pmd_write_unlock(pmd); |
12ba58af | 2047 | } |
ac8c3f3d | 2048 | |
9b7aaa64 JT |
2049 | void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd) |
2050 | { | |
6a1b1ddc | 2051 | pmd_write_lock_in_core(pmd); |
9b7aaa64 | 2052 | dm_bm_set_read_write(pmd->bm); |
6a1b1ddc | 2053 | pmd_write_unlock(pmd); |
9b7aaa64 JT |
2054 | } |
2055 | ||
ac8c3f3d JT |
2056 | int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, |
2057 | dm_block_t threshold, | |
2058 | dm_sm_threshold_fn fn, | |
2059 | void *context) | |
2060 | { | |
2061 | int r; | |
2062 | ||
6a1b1ddc | 2063 | pmd_write_lock_in_core(pmd); |
ac8c3f3d | 2064 | r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context); |
6a1b1ddc | 2065 | pmd_write_unlock(pmd); |
ac8c3f3d JT |
2066 | |
2067 | return r; | |
2068 | } | |
07f2b6e0 | 2069 | |
ecda7c02 NT |
2070 | void dm_pool_register_pre_commit_callback(struct dm_pool_metadata *pmd, |
2071 | dm_pool_pre_commit_fn fn, | |
2072 | void *context) | |
2073 | { | |
2074 | pmd_write_lock_in_core(pmd); | |
2075 | pmd->pre_commit_fn = fn; | |
2076 | pmd->pre_commit_context = context; | |
2077 | pmd_write_unlock(pmd); | |
2078 | } | |
2079 | ||
07f2b6e0 MS |
2080 | int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd) |
2081 | { | |
54fa16ee | 2082 | int r = -EINVAL; |
07f2b6e0 MS |
2083 | struct dm_block *sblock; |
2084 | struct thin_disk_superblock *disk_super; | |
2085 | ||
6a1b1ddc | 2086 | pmd_write_lock(pmd); |
54fa16ee MS |
2087 | if (pmd->fail_io) |
2088 | goto out; | |
2089 | ||
07f2b6e0 MS |
2090 | pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG; |
2091 | ||
2092 | r = superblock_lock(pmd, &sblock); | |
2093 | if (r) { | |
54fa16ee | 2094 | DMERR("couldn't lock superblock"); |
07f2b6e0 MS |
2095 | goto out; |
2096 | } | |
2097 | ||
2098 | disk_super = dm_block_data(sblock); | |
2099 | disk_super->flags = cpu_to_le32(pmd->flags); | |
2100 | ||
2101 | dm_bm_unlock(sblock); | |
2102 | out: | |
6a1b1ddc | 2103 | pmd_write_unlock(pmd); |
07f2b6e0 MS |
2104 | return r; |
2105 | } | |
2106 | ||
2107 | bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd) | |
2108 | { | |
2109 | bool needs_check; | |
2110 | ||
2111 | down_read(&pmd->root_lock); | |
2112 | needs_check = pmd->flags & THIN_METADATA_NEEDS_CHECK_FLAG; | |
2113 | up_read(&pmd->root_lock); | |
2114 | ||
2115 | return needs_check; | |
2116 | } | |
8a01a6af JT |
2117 | |
2118 | void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd) | |
2119 | { | |
2eae9e44 JT |
2120 | down_read(&pmd->root_lock); |
2121 | if (!pmd->fail_io) | |
2122 | dm_tm_issue_prefetches(pmd->tm); | |
2123 | up_read(&pmd->root_lock); | |
8a01a6af | 2124 | } |