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 | ||
be500ed7 JT |
314 | /* |
315 | * It's more efficient to call dm_sm_{inc,dec}_blocks as few times as | |
316 | * possible. 'with_runs' reads contiguous runs of blocks, and calls the | |
317 | * given sm function. | |
318 | */ | |
319 | typedef int (*run_fn)(struct dm_space_map *, dm_block_t, dm_block_t); | |
320 | ||
321 | static void with_runs(struct dm_space_map *sm, const __le64 *value_le, unsigned count, run_fn fn) | |
991d9fa0 | 322 | { |
be500ed7 | 323 | uint64_t b, begin, end; |
991d9fa0 | 324 | uint32_t t; |
be500ed7 JT |
325 | bool in_run = false; |
326 | unsigned i; | |
991d9fa0 | 327 | |
be500ed7 JT |
328 | for (i = 0; i < count; i++, value_le++) { |
329 | /* We know value_le is 8 byte aligned */ | |
330 | unpack_block_time(le64_to_cpu(*value_le), &b, &t); | |
331 | ||
332 | if (in_run) { | |
333 | if (b == end) { | |
334 | end++; | |
335 | } else { | |
336 | fn(sm, begin, end); | |
337 | begin = b; | |
338 | end = b + 1; | |
339 | } | |
340 | } else { | |
341 | in_run = true; | |
342 | begin = b; | |
343 | end = b + 1; | |
344 | } | |
345 | } | |
346 | ||
347 | if (in_run) | |
348 | fn(sm, begin, end); | |
991d9fa0 JT |
349 | } |
350 | ||
be500ed7 | 351 | static void data_block_inc(void *context, const void *value_le, unsigned count) |
991d9fa0 | 352 | { |
be500ed7 JT |
353 | with_runs((struct dm_space_map *) context, |
354 | (const __le64 *) value_le, count, dm_sm_inc_blocks); | |
355 | } | |
991d9fa0 | 356 | |
be500ed7 JT |
357 | static void data_block_dec(void *context, const void *value_le, unsigned count) |
358 | { | |
359 | with_runs((struct dm_space_map *) context, | |
360 | (const __le64 *) value_le, count, dm_sm_dec_blocks); | |
991d9fa0 JT |
361 | } |
362 | ||
018cede9 | 363 | static int data_block_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
364 | { |
365 | __le64 v1_le, v2_le; | |
366 | uint64_t b1, b2; | |
367 | uint32_t t; | |
368 | ||
369 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
370 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
371 | unpack_block_time(le64_to_cpu(v1_le), &b1, &t); | |
372 | unpack_block_time(le64_to_cpu(v2_le), &b2, &t); | |
373 | ||
374 | return b1 == b2; | |
375 | } | |
376 | ||
be500ed7 | 377 | static void subtree_inc(void *context, const void *value, unsigned count) |
991d9fa0 JT |
378 | { |
379 | struct dm_btree_info *info = context; | |
be500ed7 JT |
380 | const __le64 *root_le = value; |
381 | unsigned i; | |
991d9fa0 | 382 | |
be500ed7 JT |
383 | for (i = 0; i < count; i++, root_le++) |
384 | dm_tm_inc(info->tm, le64_to_cpu(*root_le)); | |
991d9fa0 JT |
385 | } |
386 | ||
be500ed7 | 387 | static void subtree_dec(void *context, const void *value, unsigned count) |
991d9fa0 JT |
388 | { |
389 | struct dm_btree_info *info = context; | |
be500ed7 JT |
390 | const __le64 *root_le = value; |
391 | unsigned i; | |
991d9fa0 | 392 | |
be500ed7 JT |
393 | for (i = 0; i < count; i++, root_le++) |
394 | if (dm_btree_del(info, le64_to_cpu(*root_le))) | |
395 | DMERR("btree delete failed"); | |
991d9fa0 JT |
396 | } |
397 | ||
018cede9 | 398 | static int subtree_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
399 | { |
400 | __le64 v1_le, v2_le; | |
401 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
402 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
403 | ||
404 | return v1_le == v2_le; | |
405 | } | |
406 | ||
407 | /*----------------------------------------------------------------*/ | |
408 | ||
873f258b MS |
409 | /* |
410 | * Variant that is used for in-core only changes or code that | |
411 | * shouldn't put the pool in service on its own (e.g. commit). | |
412 | */ | |
44d8ebf4 | 413 | static inline void pmd_write_lock_in_core(struct dm_pool_metadata *pmd) |
6a1b1ddc MS |
414 | __acquires(pmd->root_lock) |
415 | { | |
416 | down_write(&pmd->root_lock); | |
417 | } | |
6a1b1ddc MS |
418 | |
419 | static inline void pmd_write_lock(struct dm_pool_metadata *pmd) | |
420 | { | |
44d8ebf4 | 421 | pmd_write_lock_in_core(pmd); |
873f258b MS |
422 | if (unlikely(!pmd->in_service)) |
423 | pmd->in_service = true; | |
6a1b1ddc MS |
424 | } |
425 | ||
426 | static inline void pmd_write_unlock(struct dm_pool_metadata *pmd) | |
427 | __releases(pmd->root_lock) | |
428 | { | |
429 | up_write(&pmd->root_lock); | |
430 | } | |
431 | ||
432 | /*----------------------------------------------------------------*/ | |
433 | ||
25971192 JT |
434 | static int superblock_lock_zero(struct dm_pool_metadata *pmd, |
435 | struct dm_block **sblock) | |
436 | { | |
437 | return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
438 | &sb_validator, sblock); | |
439 | } | |
440 | ||
441 | static int superblock_lock(struct dm_pool_metadata *pmd, | |
442 | struct dm_block **sblock) | |
443 | { | |
444 | return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
445 | &sb_validator, sblock); | |
446 | } | |
447 | ||
332627db | 448 | static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result) |
991d9fa0 JT |
449 | { |
450 | int r; | |
451 | unsigned i; | |
452 | struct dm_block *b; | |
453 | __le64 *data_le, zero = cpu_to_le64(0); | |
454 | unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64); | |
455 | ||
456 | /* | |
457 | * We can't use a validator here - it may be all zeroes. | |
458 | */ | |
459 | r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b); | |
460 | if (r) | |
461 | return r; | |
462 | ||
463 | data_le = dm_block_data(b); | |
464 | *result = 1; | |
465 | for (i = 0; i < block_size; i++) { | |
466 | if (data_le[i] != zero) { | |
467 | *result = 0; | |
468 | break; | |
469 | } | |
470 | } | |
471 | ||
4c7da06f MP |
472 | dm_bm_unlock(b); |
473 | ||
474 | return 0; | |
991d9fa0 JT |
475 | } |
476 | ||
41675aea JT |
477 | static void __setup_btree_details(struct dm_pool_metadata *pmd) |
478 | { | |
479 | pmd->info.tm = pmd->tm; | |
480 | pmd->info.levels = 2; | |
481 | pmd->info.value_type.context = pmd->data_sm; | |
482 | pmd->info.value_type.size = sizeof(__le64); | |
483 | pmd->info.value_type.inc = data_block_inc; | |
484 | pmd->info.value_type.dec = data_block_dec; | |
485 | pmd->info.value_type.equal = data_block_equal; | |
486 | ||
487 | memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info)); | |
488 | pmd->nb_info.tm = pmd->nb_tm; | |
489 | ||
490 | pmd->tl_info.tm = pmd->tm; | |
491 | pmd->tl_info.levels = 1; | |
e3cbf945 | 492 | pmd->tl_info.value_type.context = &pmd->bl_info; |
41675aea JT |
493 | pmd->tl_info.value_type.size = sizeof(__le64); |
494 | pmd->tl_info.value_type.inc = subtree_inc; | |
495 | pmd->tl_info.value_type.dec = subtree_dec; | |
496 | pmd->tl_info.value_type.equal = subtree_equal; | |
497 | ||
498 | pmd->bl_info.tm = pmd->tm; | |
499 | pmd->bl_info.levels = 1; | |
500 | pmd->bl_info.value_type.context = pmd->data_sm; | |
501 | pmd->bl_info.value_type.size = sizeof(__le64); | |
502 | pmd->bl_info.value_type.inc = data_block_inc; | |
503 | pmd->bl_info.value_type.dec = data_block_dec; | |
504 | pmd->bl_info.value_type.equal = data_block_equal; | |
505 | ||
506 | pmd->details_info.tm = pmd->tm; | |
507 | pmd->details_info.levels = 1; | |
508 | pmd->details_info.value_type.context = NULL; | |
509 | pmd->details_info.value_type.size = sizeof(struct disk_device_details); | |
510 | pmd->details_info.value_type.inc = NULL; | |
511 | pmd->details_info.value_type.dec = NULL; | |
512 | pmd->details_info.value_type.equal = NULL; | |
513 | } | |
514 | ||
5a32083d JT |
515 | static int save_sm_roots(struct dm_pool_metadata *pmd) |
516 | { | |
517 | int r; | |
518 | size_t len; | |
519 | ||
520 | r = dm_sm_root_size(pmd->metadata_sm, &len); | |
521 | if (r < 0) | |
522 | return r; | |
523 | ||
524 | r = dm_sm_copy_root(pmd->metadata_sm, &pmd->metadata_space_map_root, len); | |
525 | if (r < 0) | |
526 | return r; | |
527 | ||
528 | r = dm_sm_root_size(pmd->data_sm, &len); | |
529 | if (r < 0) | |
530 | return r; | |
531 | ||
532 | return dm_sm_copy_root(pmd->data_sm, &pmd->data_space_map_root, len); | |
533 | } | |
534 | ||
535 | static void copy_sm_roots(struct dm_pool_metadata *pmd, | |
536 | struct thin_disk_superblock *disk) | |
537 | { | |
538 | memcpy(&disk->metadata_space_map_root, | |
539 | &pmd->metadata_space_map_root, | |
540 | sizeof(pmd->metadata_space_map_root)); | |
541 | ||
542 | memcpy(&disk->data_space_map_root, | |
543 | &pmd->data_space_map_root, | |
544 | sizeof(pmd->data_space_map_root)); | |
545 | } | |
546 | ||
9cb6653f JT |
547 | static int __write_initial_superblock(struct dm_pool_metadata *pmd) |
548 | { | |
549 | int r; | |
550 | struct dm_block *sblock; | |
551 | struct thin_disk_superblock *disk_super; | |
552 | sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT; | |
553 | ||
554 | if (bdev_size > THIN_METADATA_MAX_SECTORS) | |
555 | bdev_size = THIN_METADATA_MAX_SECTORS; | |
556 | ||
5a32083d | 557 | r = dm_sm_commit(pmd->data_sm); |
10d2a9ff JT |
558 | if (r < 0) |
559 | return r; | |
560 | ||
91bcdb92 | 561 | r = dm_tm_pre_commit(pmd->tm); |
10d2a9ff JT |
562 | if (r < 0) |
563 | return r; | |
564 | ||
91bcdb92 | 565 | r = save_sm_roots(pmd); |
10d2a9ff JT |
566 | if (r < 0) |
567 | return r; | |
568 | ||
9cb6653f JT |
569 | r = superblock_lock_zero(pmd, &sblock); |
570 | if (r) | |
571 | return r; | |
572 | ||
573 | disk_super = dm_block_data(sblock); | |
10d2a9ff | 574 | disk_super->flags = 0; |
583ceee2 | 575 | memset(disk_super->uuid, 0, sizeof(disk_super->uuid)); |
9cb6653f JT |
576 | disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC); |
577 | disk_super->version = cpu_to_le32(THIN_VERSION); | |
578 | disk_super->time = 0; | |
10d2a9ff JT |
579 | disk_super->trans_id = 0; |
580 | disk_super->held_root = 0; | |
581 | ||
5a32083d | 582 | copy_sm_roots(pmd, disk_super); |
10d2a9ff JT |
583 | |
584 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
585 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
7d48935e | 586 | disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE); |
9cb6653f JT |
587 | disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT); |
588 | disk_super->data_block_size = cpu_to_le32(pmd->data_block_size); | |
589 | ||
270938ba | 590 | return dm_tm_commit(pmd->tm, sblock); |
9cb6653f JT |
591 | } |
592 | ||
a97e5e6f | 593 | static int __format_metadata(struct dm_pool_metadata *pmd) |
991d9fa0 JT |
594 | { |
595 | int r; | |
384ef0e6 | 596 | |
e4d2205c JT |
597 | r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
598 | &pmd->tm, &pmd->metadata_sm); | |
599 | if (r < 0) { | |
600 | DMERR("tm_create_with_sm failed"); | |
601 | return r; | |
602 | } | |
991d9fa0 | 603 | |
a97e5e6f | 604 | pmd->data_sm = dm_sm_disk_create(pmd->tm, 0); |
e4d2205c JT |
605 | if (IS_ERR(pmd->data_sm)) { |
606 | DMERR("sm_disk_create failed"); | |
607 | r = PTR_ERR(pmd->data_sm); | |
0fa5b17b | 608 | goto bad_cleanup_tm; |
991d9fa0 JT |
609 | } |
610 | ||
d6332814 | 611 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
991d9fa0 | 612 | if (!pmd->nb_tm) { |
0fa5b17b | 613 | DMERR("could not create non-blocking clone tm"); |
991d9fa0 | 614 | r = -ENOMEM; |
0fa5b17b | 615 | goto bad_cleanup_data_sm; |
991d9fa0 JT |
616 | } |
617 | ||
41675aea | 618 | __setup_btree_details(pmd); |
991d9fa0 | 619 | |
9cb6653f JT |
620 | r = dm_btree_empty(&pmd->info, &pmd->root); |
621 | if (r < 0) | |
0fa5b17b | 622 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
623 | |
624 | r = dm_btree_empty(&pmd->details_info, &pmd->details_root); | |
625 | if (r < 0) { | |
626 | DMERR("couldn't create devices root"); | |
0fa5b17b | 627 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
628 | } |
629 | ||
630 | r = __write_initial_superblock(pmd); | |
631 | if (r) | |
0fa5b17b | 632 | goto bad_cleanup_nb_tm; |
9cb6653f | 633 | |
991d9fa0 JT |
634 | return 0; |
635 | ||
0fa5b17b JT |
636 | bad_cleanup_nb_tm: |
637 | dm_tm_destroy(pmd->nb_tm); | |
638 | bad_cleanup_data_sm: | |
d6332814 | 639 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 640 | bad_cleanup_tm: |
d6332814 JT |
641 | dm_tm_destroy(pmd->tm); |
642 | dm_sm_destroy(pmd->metadata_sm); | |
991d9fa0 JT |
643 | |
644 | return r; | |
645 | } | |
646 | ||
d73ec525 MS |
647 | static int __check_incompat_features(struct thin_disk_superblock *disk_super, |
648 | struct dm_pool_metadata *pmd) | |
649 | { | |
650 | uint32_t features; | |
651 | ||
652 | features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP; | |
653 | if (features) { | |
654 | DMERR("could not access metadata due to unsupported optional features (%lx).", | |
655 | (unsigned long)features); | |
656 | return -EINVAL; | |
657 | } | |
658 | ||
659 | /* | |
660 | * Check for read-only metadata to skip the following RDWR checks. | |
661 | */ | |
1e0dcca9 | 662 | if (bdev_read_only(pmd->bdev)) |
d73ec525 MS |
663 | return 0; |
664 | ||
665 | features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP; | |
666 | if (features) { | |
667 | DMERR("could not access metadata RDWR due to unsupported optional features (%lx).", | |
668 | (unsigned long)features); | |
669 | return -EINVAL; | |
670 | } | |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
e4d2205c JT |
675 | static int __open_metadata(struct dm_pool_metadata *pmd) |
676 | { | |
677 | int r; | |
678 | struct dm_block *sblock; | |
679 | struct thin_disk_superblock *disk_super; | |
680 | ||
681 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
682 | &sb_validator, &sblock); | |
683 | if (r < 0) { | |
684 | DMERR("couldn't read superblock"); | |
685 | return r; | |
686 | } | |
687 | ||
688 | disk_super = dm_block_data(sblock); | |
d73ec525 | 689 | |
9aec8629 MS |
690 | /* Verify the data block size hasn't changed */ |
691 | if (le32_to_cpu(disk_super->data_block_size) != pmd->data_block_size) { | |
692 | DMERR("changing the data block size (from %u to %llu) is not supported", | |
693 | le32_to_cpu(disk_super->data_block_size), | |
694 | (unsigned long long)pmd->data_block_size); | |
695 | r = -EINVAL; | |
696 | goto bad_unlock_sblock; | |
697 | } | |
698 | ||
d73ec525 | 699 | r = __check_incompat_features(disk_super, pmd); |
0fa5b17b JT |
700 | if (r < 0) |
701 | goto bad_unlock_sblock; | |
d73ec525 | 702 | |
e4d2205c JT |
703 | r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
704 | disk_super->metadata_space_map_root, | |
705 | sizeof(disk_super->metadata_space_map_root), | |
706 | &pmd->tm, &pmd->metadata_sm); | |
707 | if (r < 0) { | |
708 | DMERR("tm_open_with_sm failed"); | |
0fa5b17b | 709 | goto bad_unlock_sblock; |
e4d2205c JT |
710 | } |
711 | ||
712 | pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root, | |
713 | sizeof(disk_super->data_space_map_root)); | |
714 | if (IS_ERR(pmd->data_sm)) { | |
715 | DMERR("sm_disk_open failed"); | |
e4d2205c | 716 | r = PTR_ERR(pmd->data_sm); |
0fa5b17b | 717 | goto bad_cleanup_tm; |
e4d2205c JT |
718 | } |
719 | ||
e4d2205c JT |
720 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
721 | if (!pmd->nb_tm) { | |
0fa5b17b | 722 | DMERR("could not create non-blocking clone tm"); |
e4d2205c | 723 | r = -ENOMEM; |
0fa5b17b | 724 | goto bad_cleanup_data_sm; |
e4d2205c JT |
725 | } |
726 | ||
727 | __setup_btree_details(pmd); | |
4c7da06f MP |
728 | dm_bm_unlock(sblock); |
729 | ||
730 | return 0; | |
e4d2205c | 731 | |
0fa5b17b | 732 | bad_cleanup_data_sm: |
e4d2205c | 733 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 734 | bad_cleanup_tm: |
e4d2205c JT |
735 | dm_tm_destroy(pmd->tm); |
736 | dm_sm_destroy(pmd->metadata_sm); | |
0fa5b17b JT |
737 | bad_unlock_sblock: |
738 | dm_bm_unlock(sblock); | |
e4d2205c JT |
739 | |
740 | return r; | |
741 | } | |
742 | ||
66b1edc0 | 743 | static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device) |
e4d2205c | 744 | { |
8801e069 | 745 | int r, unformatted; |
237074c0 | 746 | |
8801e069 | 747 | r = __superblock_all_zeroes(pmd->bm, &unformatted); |
237074c0 JT |
748 | if (r) |
749 | return r; | |
750 | ||
8801e069 | 751 | if (unformatted) |
66b1edc0 JT |
752 | return format_device ? __format_metadata(pmd) : -EPERM; |
753 | ||
754 | return __open_metadata(pmd); | |
e4d2205c JT |
755 | } |
756 | ||
66b1edc0 | 757 | static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device) |
332627db JT |
758 | { |
759 | int r; | |
760 | ||
7d48935e | 761 | pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT, |
332627db JT |
762 | THIN_MAX_CONCURRENT_LOCKS); |
763 | if (IS_ERR(pmd->bm)) { | |
764 | DMERR("could not create block manager"); | |
219403d7 YB |
765 | r = PTR_ERR(pmd->bm); |
766 | pmd->bm = NULL; | |
767 | return r; | |
332627db JT |
768 | } |
769 | ||
66b1edc0 | 770 | r = __open_or_format_metadata(pmd, format_device); |
219403d7 | 771 | if (r) { |
332627db | 772 | dm_block_manager_destroy(pmd->bm); |
219403d7 YB |
773 | pmd->bm = NULL; |
774 | } | |
332627db JT |
775 | |
776 | return r; | |
777 | } | |
778 | ||
f9dd9352 JT |
779 | static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd) |
780 | { | |
781 | dm_sm_destroy(pmd->data_sm); | |
782 | dm_sm_destroy(pmd->metadata_sm); | |
783 | dm_tm_destroy(pmd->nb_tm); | |
784 | dm_tm_destroy(pmd->tm); | |
785 | dm_block_manager_destroy(pmd->bm); | |
786 | } | |
787 | ||
991d9fa0 JT |
788 | static int __begin_transaction(struct dm_pool_metadata *pmd) |
789 | { | |
790 | int r; | |
991d9fa0 JT |
791 | struct thin_disk_superblock *disk_super; |
792 | struct dm_block *sblock; | |
793 | ||
991d9fa0 JT |
794 | /* |
795 | * We re-read the superblock every time. Shouldn't need to do this | |
796 | * really. | |
797 | */ | |
798 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
799 | &sb_validator, &sblock); | |
800 | if (r) | |
801 | return r; | |
802 | ||
803 | disk_super = dm_block_data(sblock); | |
804 | pmd->time = le32_to_cpu(disk_super->time); | |
805 | pmd->root = le64_to_cpu(disk_super->data_mapping_root); | |
806 | pmd->details_root = le64_to_cpu(disk_super->device_details_root); | |
807 | pmd->trans_id = le64_to_cpu(disk_super->trans_id); | |
808 | pmd->flags = le32_to_cpu(disk_super->flags); | |
809 | pmd->data_block_size = le32_to_cpu(disk_super->data_block_size); | |
810 | ||
991d9fa0 | 811 | dm_bm_unlock(sblock); |
d73ec525 | 812 | return 0; |
991d9fa0 JT |
813 | } |
814 | ||
815 | static int __write_changed_details(struct dm_pool_metadata *pmd) | |
816 | { | |
817 | int r; | |
818 | struct dm_thin_device *td, *tmp; | |
819 | struct disk_device_details details; | |
820 | uint64_t key; | |
821 | ||
822 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
823 | if (!td->changed) | |
824 | continue; | |
825 | ||
826 | key = td->id; | |
827 | ||
828 | details.mapped_blocks = cpu_to_le64(td->mapped_blocks); | |
829 | details.transaction_id = cpu_to_le64(td->transaction_id); | |
830 | details.creation_time = cpu_to_le32(td->creation_time); | |
831 | details.snapshotted_time = cpu_to_le32(td->snapshotted_time); | |
832 | __dm_bless_for_disk(&details); | |
833 | ||
834 | r = dm_btree_insert(&pmd->details_info, pmd->details_root, | |
835 | &key, &details, &pmd->details_root); | |
836 | if (r) | |
837 | return r; | |
838 | ||
839 | if (td->open_count) | |
63ee92d1 | 840 | td->changed = false; |
991d9fa0 JT |
841 | else { |
842 | list_del(&td->list); | |
843 | kfree(td); | |
844 | } | |
991d9fa0 JT |
845 | } |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | static int __commit_transaction(struct dm_pool_metadata *pmd) | |
851 | { | |
991d9fa0 | 852 | int r; |
991d9fa0 JT |
853 | struct thin_disk_superblock *disk_super; |
854 | struct dm_block *sblock; | |
855 | ||
856 | /* | |
857 | * We need to know if the thin_disk_superblock exceeds a 512-byte sector. | |
858 | */ | |
859 | BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512); | |
44d8ebf4 | 860 | BUG_ON(!rwsem_is_locked(&pmd->root_lock)); |
991d9fa0 | 861 | |
873f258b MS |
862 | if (unlikely(!pmd->in_service)) |
863 | return 0; | |
864 | ||
ecda7c02 NT |
865 | if (pmd->pre_commit_fn) { |
866 | r = pmd->pre_commit_fn(pmd->pre_commit_context); | |
867 | if (r < 0) { | |
868 | DMERR("pre-commit callback failed"); | |
869 | return r; | |
870 | } | |
871 | } | |
872 | ||
991d9fa0 JT |
873 | r = __write_changed_details(pmd); |
874 | if (r < 0) | |
d973ac19 | 875 | return r; |
991d9fa0 | 876 | |
991d9fa0 JT |
877 | r = dm_sm_commit(pmd->data_sm); |
878 | if (r < 0) | |
d973ac19 | 879 | return r; |
991d9fa0 JT |
880 | |
881 | r = dm_tm_pre_commit(pmd->tm); | |
882 | if (r < 0) | |
d973ac19 | 883 | return r; |
991d9fa0 | 884 | |
5a32083d JT |
885 | r = save_sm_roots(pmd); |
886 | if (r < 0) | |
887 | return r; | |
888 | ||
25971192 | 889 | r = superblock_lock(pmd, &sblock); |
991d9fa0 | 890 | if (r) |
d973ac19 | 891 | return r; |
991d9fa0 JT |
892 | |
893 | disk_super = dm_block_data(sblock); | |
894 | disk_super->time = cpu_to_le32(pmd->time); | |
895 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
896 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
897 | disk_super->trans_id = cpu_to_le64(pmd->trans_id); | |
898 | disk_super->flags = cpu_to_le32(pmd->flags); | |
899 | ||
5a32083d | 900 | copy_sm_roots(pmd, disk_super); |
991d9fa0 | 901 | |
eb04cf63 | 902 | return dm_tm_commit(pmd->tm, sblock); |
991d9fa0 JT |
903 | } |
904 | ||
3ab91828 JT |
905 | static void __set_metadata_reserve(struct dm_pool_metadata *pmd) |
906 | { | |
907 | int r; | |
908 | dm_block_t total; | |
909 | dm_block_t max_blocks = 4096; /* 16M */ | |
910 | ||
911 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, &total); | |
912 | if (r) { | |
913 | DMERR("could not get size of metadata device"); | |
914 | pmd->metadata_reserve = max_blocks; | |
013ad043 MS |
915 | } else |
916 | pmd->metadata_reserve = min(max_blocks, div_u64(total, 10)); | |
3ab91828 JT |
917 | } |
918 | ||
991d9fa0 | 919 | struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, |
66b1edc0 JT |
920 | sector_t data_block_size, |
921 | bool format_device) | |
991d9fa0 JT |
922 | { |
923 | int r; | |
991d9fa0 | 924 | struct dm_pool_metadata *pmd; |
991d9fa0 JT |
925 | |
926 | pmd = kmalloc(sizeof(*pmd), GFP_KERNEL); | |
927 | if (!pmd) { | |
928 | DMERR("could not allocate metadata struct"); | |
929 | return ERR_PTR(-ENOMEM); | |
930 | } | |
931 | ||
6a0ebd31 JT |
932 | init_rwsem(&pmd->root_lock); |
933 | pmd->time = 0; | |
934 | INIT_LIST_HEAD(&pmd->thin_devices); | |
da105ed5 | 935 | pmd->fail_io = false; |
873f258b | 936 | pmd->in_service = false; |
332627db | 937 | pmd->bdev = bdev; |
9cb6653f | 938 | pmd->data_block_size = data_block_size; |
ecda7c02 NT |
939 | pmd->pre_commit_fn = NULL; |
940 | pmd->pre_commit_context = NULL; | |
991d9fa0 | 941 | |
66b1edc0 | 942 | r = __create_persistent_data_objects(pmd, format_device); |
991d9fa0 | 943 | if (r) { |
991d9fa0 JT |
944 | kfree(pmd); |
945 | return ERR_PTR(r); | |
946 | } | |
991d9fa0 | 947 | |
270938ba JT |
948 | r = __begin_transaction(pmd); |
949 | if (r < 0) { | |
950 | if (dm_pool_metadata_close(pmd) < 0) | |
951 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); | |
952 | return ERR_PTR(r); | |
991d9fa0 JT |
953 | } |
954 | ||
3ab91828 JT |
955 | __set_metadata_reserve(pmd); |
956 | ||
991d9fa0 | 957 | return pmd; |
991d9fa0 JT |
958 | } |
959 | ||
960 | int dm_pool_metadata_close(struct dm_pool_metadata *pmd) | |
961 | { | |
962 | int r; | |
963 | unsigned open_devices = 0; | |
964 | struct dm_thin_device *td, *tmp; | |
965 | ||
966 | down_read(&pmd->root_lock); | |
967 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
968 | if (td->open_count) | |
969 | open_devices++; | |
970 | else { | |
971 | list_del(&td->list); | |
972 | kfree(td); | |
973 | } | |
974 | } | |
975 | up_read(&pmd->root_lock); | |
976 | ||
977 | if (open_devices) { | |
978 | DMERR("attempt to close pmd when %u device(s) are still open", | |
979 | open_devices); | |
980 | return -EBUSY; | |
981 | } | |
982 | ||
44d8ebf4 | 983 | pmd_write_lock_in_core(pmd); |
3a653b20 | 984 | if (!pmd->fail_io && !dm_bm_is_read_only(pmd->bm)) { |
12ba58af JT |
985 | r = __commit_transaction(pmd); |
986 | if (r < 0) | |
987 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
988 | __func__, r); | |
989 | } | |
3918e066 | 990 | pmd_write_unlock(pmd); |
da105ed5 JT |
991 | if (!pmd->fail_io) |
992 | __destroy_persistent_data_objects(pmd); | |
991d9fa0 | 993 | |
da105ed5 | 994 | kfree(pmd); |
991d9fa0 JT |
995 | return 0; |
996 | } | |
997 | ||
1f3db25d MS |
998 | /* |
999 | * __open_device: Returns @td corresponding to device with id @dev, | |
1000 | * creating it if @create is set and incrementing @td->open_count. | |
1001 | * On failure, @td is undefined. | |
1002 | */ | |
991d9fa0 JT |
1003 | static int __open_device(struct dm_pool_metadata *pmd, |
1004 | dm_thin_id dev, int create, | |
1005 | struct dm_thin_device **td) | |
1006 | { | |
1007 | int r, changed = 0; | |
1008 | struct dm_thin_device *td2; | |
1009 | uint64_t key = dev; | |
1010 | struct disk_device_details details_le; | |
1011 | ||
1012 | /* | |
1f3db25d | 1013 | * If the device is already open, return it. |
991d9fa0 JT |
1014 | */ |
1015 | list_for_each_entry(td2, &pmd->thin_devices, list) | |
1016 | if (td2->id == dev) { | |
1f3db25d MS |
1017 | /* |
1018 | * May not create an already-open device. | |
1019 | */ | |
1020 | if (create) | |
1021 | return -EEXIST; | |
1022 | ||
991d9fa0 JT |
1023 | td2->open_count++; |
1024 | *td = td2; | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * Check the device exists. | |
1030 | */ | |
1031 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
1032 | &key, &details_le); | |
1033 | if (r) { | |
1034 | if (r != -ENODATA || !create) | |
1035 | return r; | |
1036 | ||
1f3db25d MS |
1037 | /* |
1038 | * Create new device. | |
1039 | */ | |
991d9fa0 JT |
1040 | changed = 1; |
1041 | details_le.mapped_blocks = 0; | |
1042 | details_le.transaction_id = cpu_to_le64(pmd->trans_id); | |
1043 | details_le.creation_time = cpu_to_le32(pmd->time); | |
1044 | details_le.snapshotted_time = cpu_to_le32(pmd->time); | |
1045 | } | |
1046 | ||
1047 | *td = kmalloc(sizeof(**td), GFP_NOIO); | |
1048 | if (!*td) | |
1049 | return -ENOMEM; | |
1050 | ||
1051 | (*td)->pmd = pmd; | |
1052 | (*td)->id = dev; | |
1053 | (*td)->open_count = 1; | |
1054 | (*td)->changed = changed; | |
da105ed5 | 1055 | (*td)->aborted_with_changes = false; |
991d9fa0 JT |
1056 | (*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks); |
1057 | (*td)->transaction_id = le64_to_cpu(details_le.transaction_id); | |
1058 | (*td)->creation_time = le32_to_cpu(details_le.creation_time); | |
1059 | (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time); | |
1060 | ||
1061 | list_add(&(*td)->list, &pmd->thin_devices); | |
1062 | ||
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | static void __close_device(struct dm_thin_device *td) | |
1067 | { | |
1068 | --td->open_count; | |
1069 | } | |
1070 | ||
1071 | static int __create_thin(struct dm_pool_metadata *pmd, | |
1072 | dm_thin_id dev) | |
1073 | { | |
1074 | int r; | |
1075 | dm_block_t dev_root; | |
1076 | uint64_t key = dev; | |
991d9fa0 JT |
1077 | struct dm_thin_device *td; |
1078 | __le64 value; | |
1079 | ||
1080 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
399c9bdb | 1081 | &key, NULL); |
991d9fa0 JT |
1082 | if (!r) |
1083 | return -EEXIST; | |
1084 | ||
1085 | /* | |
1086 | * Create an empty btree for the mappings. | |
1087 | */ | |
1088 | r = dm_btree_empty(&pmd->bl_info, &dev_root); | |
1089 | if (r) | |
1090 | return r; | |
1091 | ||
1092 | /* | |
1093 | * Insert it into the main mapping tree. | |
1094 | */ | |
1095 | value = cpu_to_le64(dev_root); | |
1096 | __dm_bless_for_disk(&value); | |
1097 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1098 | if (r) { | |
1099 | dm_btree_del(&pmd->bl_info, dev_root); | |
1100 | return r; | |
1101 | } | |
1102 | ||
1103 | r = __open_device(pmd, dev, 1, &td); | |
1104 | if (r) { | |
991d9fa0 JT |
1105 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1106 | dm_btree_del(&pmd->bl_info, dev_root); | |
1107 | return r; | |
1108 | } | |
991d9fa0 JT |
1109 | __close_device(td); |
1110 | ||
1111 | return r; | |
1112 | } | |
1113 | ||
1114 | int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1115 | { | |
da105ed5 | 1116 | int r = -EINVAL; |
991d9fa0 | 1117 | |
6a1b1ddc | 1118 | pmd_write_lock(pmd); |
da105ed5 JT |
1119 | if (!pmd->fail_io) |
1120 | r = __create_thin(pmd, dev); | |
6a1b1ddc | 1121 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1122 | |
1123 | return r; | |
1124 | } | |
1125 | ||
1126 | static int __set_snapshot_details(struct dm_pool_metadata *pmd, | |
1127 | struct dm_thin_device *snap, | |
1128 | dm_thin_id origin, uint32_t time) | |
1129 | { | |
1130 | int r; | |
1131 | struct dm_thin_device *td; | |
1132 | ||
1133 | r = __open_device(pmd, origin, 0, &td); | |
1134 | if (r) | |
1135 | return r; | |
1136 | ||
63ee92d1 | 1137 | td->changed = true; |
991d9fa0 JT |
1138 | td->snapshotted_time = time; |
1139 | ||
1140 | snap->mapped_blocks = td->mapped_blocks; | |
1141 | snap->snapshotted_time = time; | |
1142 | __close_device(td); | |
1143 | ||
1144 | return 0; | |
1145 | } | |
1146 | ||
1147 | static int __create_snap(struct dm_pool_metadata *pmd, | |
1148 | dm_thin_id dev, dm_thin_id origin) | |
1149 | { | |
1150 | int r; | |
1151 | dm_block_t origin_root; | |
1152 | uint64_t key = origin, dev_key = dev; | |
1153 | struct dm_thin_device *td; | |
991d9fa0 JT |
1154 | __le64 value; |
1155 | ||
1156 | /* check this device is unused */ | |
1157 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
399c9bdb | 1158 | &dev_key, NULL); |
991d9fa0 JT |
1159 | if (!r) |
1160 | return -EEXIST; | |
1161 | ||
1162 | /* find the mapping tree for the origin */ | |
1163 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value); | |
1164 | if (r) | |
1165 | return r; | |
1166 | origin_root = le64_to_cpu(value); | |
1167 | ||
1168 | /* clone the origin, an inc will do */ | |
1169 | dm_tm_inc(pmd->tm, origin_root); | |
1170 | ||
1171 | /* insert into the main mapping tree */ | |
1172 | value = cpu_to_le64(origin_root); | |
1173 | __dm_bless_for_disk(&value); | |
1174 | key = dev; | |
1175 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1176 | if (r) { | |
1177 | dm_tm_dec(pmd->tm, origin_root); | |
1178 | return r; | |
1179 | } | |
1180 | ||
1181 | pmd->time++; | |
1182 | ||
1183 | r = __open_device(pmd, dev, 1, &td); | |
1184 | if (r) | |
1185 | goto bad; | |
1186 | ||
1187 | r = __set_snapshot_details(pmd, td, origin, pmd->time); | |
1f3db25d MS |
1188 | __close_device(td); |
1189 | ||
991d9fa0 JT |
1190 | if (r) |
1191 | goto bad; | |
1192 | ||
991d9fa0 JT |
1193 | return 0; |
1194 | ||
1195 | bad: | |
991d9fa0 JT |
1196 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1197 | dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1198 | &key, &pmd->details_root); | |
1199 | return r; | |
1200 | } | |
1201 | ||
1202 | int dm_pool_create_snap(struct dm_pool_metadata *pmd, | |
1203 | dm_thin_id dev, | |
1204 | dm_thin_id origin) | |
1205 | { | |
da105ed5 | 1206 | int r = -EINVAL; |
991d9fa0 | 1207 | |
6a1b1ddc | 1208 | pmd_write_lock(pmd); |
da105ed5 JT |
1209 | if (!pmd->fail_io) |
1210 | r = __create_snap(pmd, dev, origin); | |
6a1b1ddc | 1211 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1212 | |
1213 | return r; | |
1214 | } | |
1215 | ||
1216 | static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1217 | { | |
1218 | int r; | |
1219 | uint64_t key = dev; | |
1220 | struct dm_thin_device *td; | |
1221 | ||
1222 | /* TODO: failure should mark the transaction invalid */ | |
1223 | r = __open_device(pmd, dev, 0, &td); | |
1224 | if (r) | |
1225 | return r; | |
1226 | ||
1227 | if (td->open_count > 1) { | |
1228 | __close_device(td); | |
1229 | return -EBUSY; | |
1230 | } | |
1231 | ||
1232 | list_del(&td->list); | |
1233 | kfree(td); | |
1234 | r = dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1235 | &key, &pmd->details_root); | |
1236 | if (r) | |
1237 | return r; | |
1238 | ||
1239 | r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); | |
1240 | if (r) | |
1241 | return r; | |
1242 | ||
991d9fa0 JT |
1243 | return 0; |
1244 | } | |
1245 | ||
1246 | int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, | |
1247 | dm_thin_id dev) | |
1248 | { | |
da105ed5 | 1249 | int r = -EINVAL; |
991d9fa0 | 1250 | |
6a1b1ddc | 1251 | pmd_write_lock(pmd); |
da105ed5 JT |
1252 | if (!pmd->fail_io) |
1253 | r = __delete_device(pmd, dev); | |
6a1b1ddc | 1254 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1255 | |
1256 | return r; | |
1257 | } | |
1258 | ||
1259 | int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1260 | uint64_t current_id, | |
1261 | uint64_t new_id) | |
1262 | { | |
da105ed5 JT |
1263 | int r = -EINVAL; |
1264 | ||
6a1b1ddc | 1265 | pmd_write_lock(pmd); |
da105ed5 JT |
1266 | |
1267 | if (pmd->fail_io) | |
1268 | goto out; | |
1269 | ||
991d9fa0 | 1270 | if (pmd->trans_id != current_id) { |
991d9fa0 | 1271 | DMERR("mismatched transaction id"); |
da105ed5 | 1272 | goto out; |
991d9fa0 JT |
1273 | } |
1274 | ||
1275 | pmd->trans_id = new_id; | |
da105ed5 JT |
1276 | r = 0; |
1277 | ||
1278 | out: | |
6a1b1ddc | 1279 | pmd_write_unlock(pmd); |
991d9fa0 | 1280 | |
da105ed5 | 1281 | return r; |
991d9fa0 JT |
1282 | } |
1283 | ||
1284 | int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1285 | uint64_t *result) | |
1286 | { | |
da105ed5 JT |
1287 | int r = -EINVAL; |
1288 | ||
991d9fa0 | 1289 | down_read(&pmd->root_lock); |
da105ed5 JT |
1290 | if (!pmd->fail_io) { |
1291 | *result = pmd->trans_id; | |
1292 | r = 0; | |
1293 | } | |
991d9fa0 JT |
1294 | up_read(&pmd->root_lock); |
1295 | ||
da105ed5 | 1296 | return r; |
991d9fa0 JT |
1297 | } |
1298 | ||
cc8394d8 JT |
1299 | static int __reserve_metadata_snap(struct dm_pool_metadata *pmd) |
1300 | { | |
1301 | int r, inc; | |
1302 | struct thin_disk_superblock *disk_super; | |
1303 | struct dm_block *copy, *sblock; | |
1304 | dm_block_t held_root; | |
1305 | ||
49e99fc7 JT |
1306 | /* |
1307 | * We commit to ensure the btree roots which we increment in a | |
1308 | * moment are up to date. | |
1309 | */ | |
a1ed4d9e MS |
1310 | r = __commit_transaction(pmd); |
1311 | if (r < 0) { | |
1312 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
1313 | __func__, r); | |
1314 | return r; | |
1315 | } | |
49e99fc7 | 1316 | |
cc8394d8 JT |
1317 | /* |
1318 | * Copy the superblock. | |
1319 | */ | |
1320 | dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION); | |
1321 | r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION, | |
1322 | &sb_validator, ©, &inc); | |
1323 | if (r) | |
1324 | return r; | |
1325 | ||
1326 | BUG_ON(!inc); | |
1327 | ||
1328 | held_root = dm_block_location(copy); | |
1329 | disk_super = dm_block_data(copy); | |
1330 | ||
1331 | if (le64_to_cpu(disk_super->held_root)) { | |
1332 | DMWARN("Pool metadata snapshot already exists: release this before taking another."); | |
1333 | ||
1334 | dm_tm_dec(pmd->tm, held_root); | |
1335 | dm_tm_unlock(pmd->tm, copy); | |
cc8394d8 JT |
1336 | return -EBUSY; |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * Wipe the spacemap since we're not publishing this. | |
1341 | */ | |
1342 | memset(&disk_super->data_space_map_root, 0, | |
1343 | sizeof(disk_super->data_space_map_root)); | |
1344 | memset(&disk_super->metadata_space_map_root, 0, | |
1345 | sizeof(disk_super->metadata_space_map_root)); | |
1346 | ||
1347 | /* | |
1348 | * Increment the data structures that need to be preserved. | |
1349 | */ | |
1350 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root)); | |
1351 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root)); | |
1352 | dm_tm_unlock(pmd->tm, copy); | |
1353 | ||
1354 | /* | |
1355 | * Write the held root into the superblock. | |
1356 | */ | |
25971192 | 1357 | r = superblock_lock(pmd, &sblock); |
cc8394d8 JT |
1358 | if (r) { |
1359 | dm_tm_dec(pmd->tm, held_root); | |
cc8394d8 JT |
1360 | return r; |
1361 | } | |
1362 | ||
1363 | disk_super = dm_block_data(sblock); | |
1364 | disk_super->held_root = cpu_to_le64(held_root); | |
1365 | dm_bm_unlock(sblock); | |
cc8394d8 JT |
1366 | return 0; |
1367 | } | |
1368 | ||
1369 | int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd) | |
1370 | { | |
da105ed5 | 1371 | int r = -EINVAL; |
cc8394d8 | 1372 | |
6a1b1ddc | 1373 | pmd_write_lock(pmd); |
da105ed5 JT |
1374 | if (!pmd->fail_io) |
1375 | r = __reserve_metadata_snap(pmd); | |
6a1b1ddc | 1376 | pmd_write_unlock(pmd); |
cc8394d8 JT |
1377 | |
1378 | return r; | |
1379 | } | |
1380 | ||
1381 | static int __release_metadata_snap(struct dm_pool_metadata *pmd) | |
991d9fa0 JT |
1382 | { |
1383 | int r; | |
1384 | struct thin_disk_superblock *disk_super; | |
cc8394d8 JT |
1385 | struct dm_block *sblock, *copy; |
1386 | dm_block_t held_root; | |
991d9fa0 | 1387 | |
25971192 | 1388 | r = superblock_lock(pmd, &sblock); |
991d9fa0 JT |
1389 | if (r) |
1390 | return r; | |
1391 | ||
cc8394d8 JT |
1392 | disk_super = dm_block_data(sblock); |
1393 | held_root = le64_to_cpu(disk_super->held_root); | |
1394 | disk_super->held_root = cpu_to_le64(0); | |
cc8394d8 JT |
1395 | |
1396 | dm_bm_unlock(sblock); | |
1397 | ||
1398 | if (!held_root) { | |
1399 | DMWARN("No pool metadata snapshot found: nothing to release."); | |
1400 | return -EINVAL; | |
1401 | } | |
1402 | ||
1403 | r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, ©); | |
1404 | if (r) | |
1405 | return r; | |
1406 | ||
1407 | disk_super = dm_block_data(copy); | |
7f518ad0 JT |
1408 | dm_btree_del(&pmd->info, le64_to_cpu(disk_super->data_mapping_root)); |
1409 | dm_btree_del(&pmd->details_info, le64_to_cpu(disk_super->device_details_root)); | |
cc8394d8 JT |
1410 | dm_sm_dec_block(pmd->metadata_sm, held_root); |
1411 | ||
4c7da06f MP |
1412 | dm_tm_unlock(pmd->tm, copy); |
1413 | ||
1414 | return 0; | |
cc8394d8 JT |
1415 | } |
1416 | ||
1417 | int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd) | |
1418 | { | |
da105ed5 | 1419 | int r = -EINVAL; |
cc8394d8 | 1420 | |
6a1b1ddc | 1421 | pmd_write_lock(pmd); |
da105ed5 JT |
1422 | if (!pmd->fail_io) |
1423 | r = __release_metadata_snap(pmd); | |
6a1b1ddc | 1424 | pmd_write_unlock(pmd); |
cc8394d8 JT |
1425 | |
1426 | return r; | |
1427 | } | |
1428 | ||
1429 | static int __get_metadata_snap(struct dm_pool_metadata *pmd, | |
1430 | dm_block_t *result) | |
1431 | { | |
1432 | int r; | |
1433 | struct thin_disk_superblock *disk_super; | |
1434 | struct dm_block *sblock; | |
1435 | ||
1436 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
1437 | &sb_validator, &sblock); | |
1438 | if (r) | |
1439 | return r; | |
1440 | ||
991d9fa0 JT |
1441 | disk_super = dm_block_data(sblock); |
1442 | *result = le64_to_cpu(disk_super->held_root); | |
1443 | ||
4c7da06f MP |
1444 | dm_bm_unlock(sblock); |
1445 | ||
1446 | return 0; | |
991d9fa0 JT |
1447 | } |
1448 | ||
cc8394d8 JT |
1449 | int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd, |
1450 | dm_block_t *result) | |
991d9fa0 | 1451 | { |
da105ed5 | 1452 | int r = -EINVAL; |
991d9fa0 JT |
1453 | |
1454 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1455 | if (!pmd->fail_io) |
1456 | r = __get_metadata_snap(pmd, result); | |
991d9fa0 JT |
1457 | up_read(&pmd->root_lock); |
1458 | ||
1459 | return r; | |
1460 | } | |
1461 | ||
1462 | int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, | |
1463 | struct dm_thin_device **td) | |
1464 | { | |
da105ed5 | 1465 | int r = -EINVAL; |
991d9fa0 | 1466 | |
6a1b1ddc | 1467 | pmd_write_lock_in_core(pmd); |
da105ed5 JT |
1468 | if (!pmd->fail_io) |
1469 | r = __open_device(pmd, dev, 0, td); | |
6a1b1ddc | 1470 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1471 | |
1472 | return r; | |
1473 | } | |
1474 | ||
1475 | int dm_pool_close_thin_device(struct dm_thin_device *td) | |
1476 | { | |
6a1b1ddc | 1477 | pmd_write_lock_in_core(td->pmd); |
991d9fa0 | 1478 | __close_device(td); |
6a1b1ddc | 1479 | pmd_write_unlock(td->pmd); |
991d9fa0 JT |
1480 | |
1481 | return 0; | |
1482 | } | |
1483 | ||
1484 | dm_thin_id dm_thin_dev_id(struct dm_thin_device *td) | |
1485 | { | |
1486 | return td->id; | |
1487 | } | |
1488 | ||
19fa1a67 JT |
1489 | /* |
1490 | * Check whether @time (of block creation) is older than @td's last snapshot. | |
1491 | * If so then the associated block is shared with the last snapshot device. | |
1492 | * Any block on a device created *after* the device last got snapshotted is | |
1493 | * necessarily not shared. | |
1494 | */ | |
17b7d63f | 1495 | static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time) |
991d9fa0 JT |
1496 | { |
1497 | return td->snapshotted_time > time; | |
1498 | } | |
1499 | ||
3d5f6733 JT |
1500 | static void unpack_lookup_result(struct dm_thin_device *td, __le64 value, |
1501 | struct dm_thin_lookup_result *result) | |
1502 | { | |
1503 | uint64_t block_time = 0; | |
1504 | dm_block_t exception_block; | |
1505 | uint32_t exception_time; | |
1506 | ||
1507 | block_time = le64_to_cpu(value); | |
1508 | unpack_block_time(block_time, &exception_block, &exception_time); | |
1509 | result->block = exception_block; | |
1510 | result->shared = __snapshotted_since(td, exception_time); | |
1511 | } | |
1512 | ||
086fbbbd JT |
1513 | static int __find_block(struct dm_thin_device *td, dm_block_t block, |
1514 | int can_issue_io, struct dm_thin_lookup_result *result) | |
991d9fa0 | 1515 | { |
e5cfc69a | 1516 | int r; |
991d9fa0 JT |
1517 | __le64 value; |
1518 | struct dm_pool_metadata *pmd = td->pmd; | |
1519 | dm_block_t keys[2] = { td->id, block }; | |
da105ed5 | 1520 | struct dm_btree_info *info; |
991d9fa0 | 1521 | |
e5cfc69a JT |
1522 | if (can_issue_io) { |
1523 | info = &pmd->info; | |
1524 | } else | |
1525 | info = &pmd->nb_info; | |
da105ed5 | 1526 | |
e5cfc69a | 1527 | r = dm_btree_lookup(info, pmd->root, keys, &value); |
3d5f6733 JT |
1528 | if (!r) |
1529 | unpack_lookup_result(td, value, result); | |
1530 | ||
3d5f6733 JT |
1531 | return r; |
1532 | } | |
1533 | ||
086fbbbd JT |
1534 | int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, |
1535 | int can_issue_io, struct dm_thin_lookup_result *result) | |
3d5f6733 JT |
1536 | { |
1537 | int r; | |
3d5f6733 | 1538 | struct dm_pool_metadata *pmd = td->pmd; |
3d5f6733 JT |
1539 | |
1540 | down_read(&pmd->root_lock); | |
1541 | if (pmd->fail_io) { | |
1542 | up_read(&pmd->root_lock); | |
1543 | return -EINVAL; | |
991d9fa0 JT |
1544 | } |
1545 | ||
086fbbbd JT |
1546 | r = __find_block(td, block, can_issue_io, result); |
1547 | ||
1548 | up_read(&pmd->root_lock); | |
1549 | return r; | |
1550 | } | |
1551 | ||
1552 | static int __find_next_mapped_block(struct dm_thin_device *td, dm_block_t block, | |
1553 | dm_block_t *vblock, | |
1554 | struct dm_thin_lookup_result *result) | |
1555 | { | |
1556 | int r; | |
1557 | __le64 value; | |
1558 | struct dm_pool_metadata *pmd = td->pmd; | |
1559 | dm_block_t keys[2] = { td->id, block }; | |
1560 | ||
3d5f6733 JT |
1561 | r = dm_btree_lookup_next(&pmd->info, pmd->root, keys, vblock, &value); |
1562 | if (!r) | |
1563 | unpack_lookup_result(td, value, result); | |
1564 | ||
991d9fa0 JT |
1565 | return r; |
1566 | } | |
1567 | ||
086fbbbd JT |
1568 | static int __find_mapped_range(struct dm_thin_device *td, |
1569 | dm_block_t begin, dm_block_t end, | |
1570 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1571 | dm_block_t *pool_begin, bool *maybe_shared) | |
a5d895a9 JT |
1572 | { |
1573 | int r; | |
1574 | dm_block_t pool_end; | |
1575 | struct dm_thin_lookup_result lookup; | |
1576 | ||
1577 | if (end < begin) | |
1578 | return -ENODATA; | |
1579 | ||
086fbbbd | 1580 | r = __find_next_mapped_block(td, begin, &begin, &lookup); |
3d5f6733 JT |
1581 | if (r) |
1582 | return r; | |
a5d895a9 | 1583 | |
3d5f6733 | 1584 | if (begin >= end) |
a5d895a9 JT |
1585 | return -ENODATA; |
1586 | ||
1587 | *thin_begin = begin; | |
1588 | *pool_begin = lookup.block; | |
1589 | *maybe_shared = lookup.shared; | |
1590 | ||
1591 | begin++; | |
1592 | pool_end = *pool_begin + 1; | |
1593 | while (begin != end) { | |
086fbbbd | 1594 | r = __find_block(td, begin, true, &lookup); |
a5d895a9 JT |
1595 | if (r) { |
1596 | if (r == -ENODATA) | |
1597 | break; | |
1598 | else | |
1599 | return r; | |
1600 | } | |
1601 | ||
1602 | if ((lookup.block != pool_end) || | |
1603 | (lookup.shared != *maybe_shared)) | |
1604 | break; | |
1605 | ||
1606 | pool_end++; | |
1607 | begin++; | |
1608 | } | |
1609 | ||
1610 | *thin_end = begin; | |
1611 | return 0; | |
1612 | } | |
1613 | ||
086fbbbd JT |
1614 | int dm_thin_find_mapped_range(struct dm_thin_device *td, |
1615 | dm_block_t begin, dm_block_t end, | |
1616 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1617 | dm_block_t *pool_begin, bool *maybe_shared) | |
1618 | { | |
1619 | int r = -EINVAL; | |
1620 | struct dm_pool_metadata *pmd = td->pmd; | |
1621 | ||
1622 | down_read(&pmd->root_lock); | |
1623 | if (!pmd->fail_io) { | |
1624 | r = __find_mapped_range(td, begin, end, thin_begin, thin_end, | |
1625 | pool_begin, maybe_shared); | |
1626 | } | |
1627 | up_read(&pmd->root_lock); | |
1628 | ||
1629 | return r; | |
1630 | } | |
1631 | ||
991d9fa0 JT |
1632 | static int __insert(struct dm_thin_device *td, dm_block_t block, |
1633 | dm_block_t data_block) | |
1634 | { | |
1635 | int r, inserted; | |
1636 | __le64 value; | |
1637 | struct dm_pool_metadata *pmd = td->pmd; | |
1638 | dm_block_t keys[2] = { td->id, block }; | |
1639 | ||
991d9fa0 JT |
1640 | value = cpu_to_le64(pack_block_time(data_block, pmd->time)); |
1641 | __dm_bless_for_disk(&value); | |
1642 | ||
1643 | r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value, | |
1644 | &pmd->root, &inserted); | |
1645 | if (r) | |
1646 | return r; | |
1647 | ||
63ee92d1 | 1648 | td->changed = true; |
40db5a53 | 1649 | if (inserted) |
991d9fa0 | 1650 | td->mapped_blocks++; |
991d9fa0 JT |
1651 | |
1652 | return 0; | |
1653 | } | |
1654 | ||
1655 | int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, | |
1656 | dm_block_t data_block) | |
1657 | { | |
da105ed5 | 1658 | int r = -EINVAL; |
991d9fa0 | 1659 | |
6a1b1ddc | 1660 | pmd_write_lock(td->pmd); |
da105ed5 JT |
1661 | if (!td->pmd->fail_io) |
1662 | r = __insert(td, block, data_block); | |
6a1b1ddc | 1663 | pmd_write_unlock(td->pmd); |
991d9fa0 JT |
1664 | |
1665 | return r; | |
1666 | } | |
1667 | ||
1668 | static int __remove(struct dm_thin_device *td, dm_block_t block) | |
1669 | { | |
1670 | int r; | |
1671 | struct dm_pool_metadata *pmd = td->pmd; | |
1672 | dm_block_t keys[2] = { td->id, block }; | |
1673 | ||
1674 | r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root); | |
1675 | if (r) | |
1676 | return r; | |
1677 | ||
af63bcb8 | 1678 | td->mapped_blocks--; |
63ee92d1 | 1679 | td->changed = true; |
991d9fa0 JT |
1680 | |
1681 | return 0; | |
1682 | } | |
1683 | ||
6550f075 JT |
1684 | static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end) |
1685 | { | |
1686 | int r; | |
993ceab9 | 1687 | unsigned count, total_count = 0; |
6550f075 JT |
1688 | struct dm_pool_metadata *pmd = td->pmd; |
1689 | dm_block_t keys[1] = { td->id }; | |
1690 | __le64 value; | |
1691 | dm_block_t mapping_root; | |
1692 | ||
1693 | /* | |
1694 | * Find the mapping tree | |
1695 | */ | |
1696 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value); | |
1697 | if (r) | |
1698 | return r; | |
1699 | ||
1700 | /* | |
1701 | * Remove from the mapping tree, taking care to inc the | |
1702 | * ref count so it doesn't get deleted. | |
1703 | */ | |
1704 | mapping_root = le64_to_cpu(value); | |
1705 | dm_tm_inc(pmd->tm, mapping_root); | |
1706 | r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root); | |
1707 | if (r) | |
1708 | return r; | |
1709 | ||
993ceab9 JT |
1710 | /* |
1711 | * Remove leaves stops at the first unmapped entry, so we have to | |
1712 | * loop round finding mapped ranges. | |
1713 | */ | |
1714 | while (begin < end) { | |
1715 | r = dm_btree_lookup_next(&pmd->bl_info, mapping_root, &begin, &begin, &value); | |
1716 | if (r == -ENODATA) | |
1717 | break; | |
1718 | ||
1719 | if (r) | |
1720 | return r; | |
1721 | ||
1722 | if (begin >= end) | |
1723 | break; | |
1724 | ||
1725 | r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count); | |
1726 | if (r) | |
1727 | return r; | |
1728 | ||
1729 | total_count += count; | |
1730 | } | |
6550f075 | 1731 | |
993ceab9 | 1732 | td->mapped_blocks -= total_count; |
63ee92d1 | 1733 | td->changed = true; |
6550f075 JT |
1734 | |
1735 | /* | |
1736 | * Reinsert the mapping tree. | |
1737 | */ | |
1738 | value = cpu_to_le64(mapping_root); | |
1739 | __dm_bless_for_disk(&value); | |
1740 | return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root); | |
1741 | } | |
1742 | ||
991d9fa0 JT |
1743 | int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) |
1744 | { | |
da105ed5 | 1745 | int r = -EINVAL; |
991d9fa0 | 1746 | |
6a1b1ddc | 1747 | pmd_write_lock(td->pmd); |
da105ed5 JT |
1748 | if (!td->pmd->fail_io) |
1749 | r = __remove(td, block); | |
6a1b1ddc | 1750 | pmd_write_unlock(td->pmd); |
19fa1a67 JT |
1751 | |
1752 | return r; | |
1753 | } | |
1754 | ||
6550f075 JT |
1755 | int dm_thin_remove_range(struct dm_thin_device *td, |
1756 | dm_block_t begin, dm_block_t end) | |
1757 | { | |
1758 | int r = -EINVAL; | |
1759 | ||
6a1b1ddc | 1760 | pmd_write_lock(td->pmd); |
6550f075 JT |
1761 | if (!td->pmd->fail_io) |
1762 | r = __remove_range(td, begin, end); | |
6a1b1ddc | 1763 | pmd_write_unlock(td->pmd); |
6550f075 JT |
1764 | |
1765 | return r; | |
1766 | } | |
1767 | ||
d445bd9c | 1768 | int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) |
19fa1a67 JT |
1769 | { |
1770 | int r; | |
1771 | uint32_t ref_count; | |
1772 | ||
1773 | down_read(&pmd->root_lock); | |
1774 | r = dm_sm_get_count(pmd->data_sm, b, &ref_count); | |
1775 | if (!r) | |
d445bd9c | 1776 | *result = (ref_count > 1); |
19fa1a67 | 1777 | up_read(&pmd->root_lock); |
991d9fa0 JT |
1778 | |
1779 | return r; | |
1780 | } | |
1781 | ||
2a0fbffb JT |
1782 | int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) |
1783 | { | |
1784 | int r = 0; | |
1785 | ||
6a1b1ddc | 1786 | pmd_write_lock(pmd); |
be500ed7 | 1787 | r = dm_sm_inc_blocks(pmd->data_sm, b, e); |
6a1b1ddc | 1788 | pmd_write_unlock(pmd); |
2a0fbffb JT |
1789 | |
1790 | return r; | |
1791 | } | |
1792 | ||
1793 | int dm_pool_dec_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) | |
1794 | { | |
1795 | int r = 0; | |
1796 | ||
6a1b1ddc | 1797 | pmd_write_lock(pmd); |
be500ed7 | 1798 | r = dm_sm_dec_blocks(pmd->data_sm, b, e); |
6a1b1ddc | 1799 | pmd_write_unlock(pmd); |
2a0fbffb JT |
1800 | |
1801 | return r; | |
1802 | } | |
1803 | ||
40db5a53 JT |
1804 | bool dm_thin_changed_this_transaction(struct dm_thin_device *td) |
1805 | { | |
1806 | int r; | |
1807 | ||
1808 | down_read(&td->pmd->root_lock); | |
1809 | r = td->changed; | |
1810 | up_read(&td->pmd->root_lock); | |
1811 | ||
1812 | return r; | |
1813 | } | |
1814 | ||
4d1662a3 MS |
1815 | bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd) |
1816 | { | |
1817 | bool r = false; | |
1818 | struct dm_thin_device *td, *tmp; | |
1819 | ||
1820 | down_read(&pmd->root_lock); | |
1821 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
1822 | if (td->changed) { | |
1823 | r = td->changed; | |
1824 | break; | |
1825 | } | |
1826 | } | |
1827 | up_read(&pmd->root_lock); | |
1828 | ||
1829 | return r; | |
1830 | } | |
1831 | ||
da105ed5 JT |
1832 | bool dm_thin_aborted_changes(struct dm_thin_device *td) |
1833 | { | |
1834 | bool r; | |
1835 | ||
1836 | down_read(&td->pmd->root_lock); | |
1837 | r = td->aborted_with_changes; | |
1838 | up_read(&td->pmd->root_lock); | |
1839 | ||
1840 | return r; | |
1841 | } | |
1842 | ||
991d9fa0 JT |
1843 | int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result) |
1844 | { | |
da105ed5 | 1845 | int r = -EINVAL; |
991d9fa0 | 1846 | |
6a1b1ddc | 1847 | pmd_write_lock(pmd); |
da105ed5 JT |
1848 | if (!pmd->fail_io) |
1849 | r = dm_sm_new_block(pmd->data_sm, result); | |
6a1b1ddc | 1850 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1851 | |
1852 | return r; | |
1853 | } | |
1854 | ||
1855 | int dm_pool_commit_metadata(struct dm_pool_metadata *pmd) | |
1856 | { | |
da105ed5 | 1857 | int r = -EINVAL; |
991d9fa0 | 1858 | |
873f258b MS |
1859 | /* |
1860 | * Care is taken to not have commit be what | |
1861 | * triggers putting the thin-pool in-service. | |
1862 | */ | |
44d8ebf4 | 1863 | pmd_write_lock_in_core(pmd); |
da105ed5 JT |
1864 | if (pmd->fail_io) |
1865 | goto out; | |
991d9fa0 JT |
1866 | |
1867 | r = __commit_transaction(pmd); | |
873f258b | 1868 | if (r < 0) |
991d9fa0 JT |
1869 | goto out; |
1870 | ||
1871 | /* | |
1872 | * Open the next transaction. | |
1873 | */ | |
1874 | r = __begin_transaction(pmd); | |
1875 | out: | |
6a1b1ddc | 1876 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1877 | return r; |
1878 | } | |
1879 | ||
da105ed5 JT |
1880 | static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd) |
1881 | { | |
1882 | struct dm_thin_device *td; | |
1883 | ||
1884 | list_for_each_entry(td, &pmd->thin_devices, list) | |
1885 | td->aborted_with_changes = td->changed; | |
1886 | } | |
1887 | ||
1888 | int dm_pool_abort_metadata(struct dm_pool_metadata *pmd) | |
1889 | { | |
1890 | int r = -EINVAL; | |
1891 | ||
6a1b1ddc | 1892 | pmd_write_lock(pmd); |
da105ed5 JT |
1893 | if (pmd->fail_io) |
1894 | goto out; | |
1895 | ||
1896 | __set_abort_with_changes_flags(pmd); | |
1897 | __destroy_persistent_data_objects(pmd); | |
1898 | r = __create_persistent_data_objects(pmd, false); | |
1899 | if (r) | |
1900 | pmd->fail_io = true; | |
1901 | ||
1902 | out: | |
6a1b1ddc | 1903 | pmd_write_unlock(pmd); |
da105ed5 JT |
1904 | |
1905 | return r; | |
1906 | } | |
1907 | ||
991d9fa0 JT |
1908 | int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result) |
1909 | { | |
da105ed5 | 1910 | int r = -EINVAL; |
991d9fa0 JT |
1911 | |
1912 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1913 | if (!pmd->fail_io) |
1914 | r = dm_sm_get_nr_free(pmd->data_sm, result); | |
991d9fa0 JT |
1915 | up_read(&pmd->root_lock); |
1916 | ||
1917 | return r; | |
1918 | } | |
1919 | ||
1920 | int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, | |
1921 | dm_block_t *result) | |
1922 | { | |
da105ed5 | 1923 | int r = -EINVAL; |
991d9fa0 JT |
1924 | |
1925 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1926 | if (!pmd->fail_io) |
1927 | r = dm_sm_get_nr_free(pmd->metadata_sm, result); | |
3ab91828 JT |
1928 | |
1929 | if (!r) { | |
1930 | if (*result < pmd->metadata_reserve) | |
1931 | *result = 0; | |
1932 | else | |
1933 | *result -= pmd->metadata_reserve; | |
1934 | } | |
991d9fa0 JT |
1935 | up_read(&pmd->root_lock); |
1936 | ||
1937 | return r; | |
1938 | } | |
1939 | ||
1940 | int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, | |
1941 | dm_block_t *result) | |
1942 | { | |
da105ed5 | 1943 | int r = -EINVAL; |
991d9fa0 JT |
1944 | |
1945 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1946 | if (!pmd->fail_io) |
1947 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, result); | |
991d9fa0 JT |
1948 | up_read(&pmd->root_lock); |
1949 | ||
1950 | return r; | |
1951 | } | |
1952 | ||
991d9fa0 JT |
1953 | int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result) |
1954 | { | |
da105ed5 | 1955 | int r = -EINVAL; |
991d9fa0 JT |
1956 | |
1957 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1958 | if (!pmd->fail_io) |
1959 | r = dm_sm_get_nr_blocks(pmd->data_sm, result); | |
991d9fa0 JT |
1960 | up_read(&pmd->root_lock); |
1961 | ||
1962 | return r; | |
1963 | } | |
1964 | ||
1965 | int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result) | |
1966 | { | |
da105ed5 | 1967 | int r = -EINVAL; |
991d9fa0 JT |
1968 | struct dm_pool_metadata *pmd = td->pmd; |
1969 | ||
1970 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1971 | if (!pmd->fail_io) { |
1972 | *result = td->mapped_blocks; | |
1973 | r = 0; | |
1974 | } | |
991d9fa0 JT |
1975 | up_read(&pmd->root_lock); |
1976 | ||
da105ed5 | 1977 | return r; |
991d9fa0 JT |
1978 | } |
1979 | ||
1980 | static int __highest_block(struct dm_thin_device *td, dm_block_t *result) | |
1981 | { | |
1982 | int r; | |
1983 | __le64 value_le; | |
1984 | dm_block_t thin_root; | |
1985 | struct dm_pool_metadata *pmd = td->pmd; | |
1986 | ||
1987 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le); | |
1988 | if (r) | |
1989 | return r; | |
1990 | ||
1991 | thin_root = le64_to_cpu(value_le); | |
1992 | ||
1993 | return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result); | |
1994 | } | |
1995 | ||
1996 | int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, | |
1997 | dm_block_t *result) | |
1998 | { | |
da105ed5 | 1999 | int r = -EINVAL; |
991d9fa0 JT |
2000 | struct dm_pool_metadata *pmd = td->pmd; |
2001 | ||
2002 | down_read(&pmd->root_lock); | |
da105ed5 JT |
2003 | if (!pmd->fail_io) |
2004 | r = __highest_block(td, result); | |
991d9fa0 JT |
2005 | up_read(&pmd->root_lock); |
2006 | ||
2007 | return r; | |
2008 | } | |
2009 | ||
b17446df | 2010 | static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count) |
991d9fa0 JT |
2011 | { |
2012 | int r; | |
2013 | dm_block_t old_count; | |
2014 | ||
b17446df | 2015 | r = dm_sm_get_nr_blocks(sm, &old_count); |
991d9fa0 JT |
2016 | if (r) |
2017 | return r; | |
2018 | ||
2019 | if (new_count == old_count) | |
2020 | return 0; | |
2021 | ||
2022 | if (new_count < old_count) { | |
b17446df | 2023 | DMERR("cannot reduce size of space map"); |
991d9fa0 JT |
2024 | return -EINVAL; |
2025 | } | |
2026 | ||
b17446df | 2027 | return dm_sm_extend(sm, new_count - old_count); |
991d9fa0 JT |
2028 | } |
2029 | ||
2030 | int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) | |
2031 | { | |
da105ed5 | 2032 | int r = -EINVAL; |
991d9fa0 | 2033 | |
6a1b1ddc | 2034 | pmd_write_lock(pmd); |
da105ed5 | 2035 | if (!pmd->fail_io) |
b17446df | 2036 | r = __resize_space_map(pmd->data_sm, new_count); |
6a1b1ddc | 2037 | pmd_write_unlock(pmd); |
991d9fa0 JT |
2038 | |
2039 | return r; | |
2040 | } | |
12ba58af | 2041 | |
24347e95 JT |
2042 | int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) |
2043 | { | |
2044 | int r = -EINVAL; | |
2045 | ||
6a1b1ddc | 2046 | pmd_write_lock(pmd); |
3ab91828 | 2047 | if (!pmd->fail_io) { |
24347e95 | 2048 | r = __resize_space_map(pmd->metadata_sm, new_count); |
3ab91828 JT |
2049 | if (!r) |
2050 | __set_metadata_reserve(pmd); | |
2051 | } | |
6a1b1ddc | 2052 | pmd_write_unlock(pmd); |
24347e95 JT |
2053 | |
2054 | return r; | |
2055 | } | |
2056 | ||
12ba58af JT |
2057 | void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) |
2058 | { | |
6a1b1ddc | 2059 | pmd_write_lock_in_core(pmd); |
12ba58af | 2060 | dm_bm_set_read_only(pmd->bm); |
6a1b1ddc | 2061 | pmd_write_unlock(pmd); |
12ba58af | 2062 | } |
ac8c3f3d | 2063 | |
9b7aaa64 JT |
2064 | void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd) |
2065 | { | |
6a1b1ddc | 2066 | pmd_write_lock_in_core(pmd); |
9b7aaa64 | 2067 | dm_bm_set_read_write(pmd->bm); |
6a1b1ddc | 2068 | pmd_write_unlock(pmd); |
9b7aaa64 JT |
2069 | } |
2070 | ||
ac8c3f3d JT |
2071 | int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, |
2072 | dm_block_t threshold, | |
2073 | dm_sm_threshold_fn fn, | |
2074 | void *context) | |
2075 | { | |
2076 | int r; | |
2077 | ||
6a1b1ddc | 2078 | pmd_write_lock_in_core(pmd); |
ac8c3f3d | 2079 | r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context); |
6a1b1ddc | 2080 | pmd_write_unlock(pmd); |
ac8c3f3d JT |
2081 | |
2082 | return r; | |
2083 | } | |
07f2b6e0 | 2084 | |
ecda7c02 NT |
2085 | void dm_pool_register_pre_commit_callback(struct dm_pool_metadata *pmd, |
2086 | dm_pool_pre_commit_fn fn, | |
2087 | void *context) | |
2088 | { | |
2089 | pmd_write_lock_in_core(pmd); | |
2090 | pmd->pre_commit_fn = fn; | |
2091 | pmd->pre_commit_context = context; | |
2092 | pmd_write_unlock(pmd); | |
2093 | } | |
2094 | ||
07f2b6e0 MS |
2095 | int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd) |
2096 | { | |
54fa16ee | 2097 | int r = -EINVAL; |
07f2b6e0 MS |
2098 | struct dm_block *sblock; |
2099 | struct thin_disk_superblock *disk_super; | |
2100 | ||
6a1b1ddc | 2101 | pmd_write_lock(pmd); |
54fa16ee MS |
2102 | if (pmd->fail_io) |
2103 | goto out; | |
2104 | ||
07f2b6e0 MS |
2105 | pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG; |
2106 | ||
2107 | r = superblock_lock(pmd, &sblock); | |
2108 | if (r) { | |
54fa16ee | 2109 | DMERR("couldn't lock superblock"); |
07f2b6e0 MS |
2110 | goto out; |
2111 | } | |
2112 | ||
2113 | disk_super = dm_block_data(sblock); | |
2114 | disk_super->flags = cpu_to_le32(pmd->flags); | |
2115 | ||
2116 | dm_bm_unlock(sblock); | |
2117 | out: | |
6a1b1ddc | 2118 | pmd_write_unlock(pmd); |
07f2b6e0 MS |
2119 | return r; |
2120 | } | |
2121 | ||
2122 | bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd) | |
2123 | { | |
2124 | bool needs_check; | |
2125 | ||
2126 | down_read(&pmd->root_lock); | |
2127 | needs_check = pmd->flags & THIN_METADATA_NEEDS_CHECK_FLAG; | |
2128 | up_read(&pmd->root_lock); | |
2129 | ||
2130 | return needs_check; | |
2131 | } | |
8a01a6af JT |
2132 | |
2133 | void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd) | |
2134 | { | |
2eae9e44 JT |
2135 | down_read(&pmd->root_lock); |
2136 | if (!pmd->fail_io) | |
2137 | dm_tm_issue_prefetches(pmd->tm); | |
2138 | up_read(&pmd->root_lock); | |
8a01a6af | 2139 | } |