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 | */ | |
6a1b1ddc MS |
390 | static inline void __pmd_write_lock(struct dm_pool_metadata *pmd) |
391 | __acquires(pmd->root_lock) | |
392 | { | |
393 | down_write(&pmd->root_lock); | |
394 | } | |
395 | #define pmd_write_lock_in_core(pmd) __pmd_write_lock((pmd)) | |
396 | ||
397 | static inline void pmd_write_lock(struct dm_pool_metadata *pmd) | |
398 | { | |
399 | __pmd_write_lock(pmd); | |
873f258b MS |
400 | if (unlikely(!pmd->in_service)) |
401 | pmd->in_service = true; | |
6a1b1ddc MS |
402 | } |
403 | ||
404 | static inline void pmd_write_unlock(struct dm_pool_metadata *pmd) | |
405 | __releases(pmd->root_lock) | |
406 | { | |
407 | up_write(&pmd->root_lock); | |
408 | } | |
409 | ||
410 | /*----------------------------------------------------------------*/ | |
411 | ||
25971192 JT |
412 | static int superblock_lock_zero(struct dm_pool_metadata *pmd, |
413 | struct dm_block **sblock) | |
414 | { | |
415 | return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
416 | &sb_validator, sblock); | |
417 | } | |
418 | ||
419 | static int superblock_lock(struct dm_pool_metadata *pmd, | |
420 | struct dm_block **sblock) | |
421 | { | |
422 | return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
423 | &sb_validator, sblock); | |
424 | } | |
425 | ||
332627db | 426 | static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result) |
991d9fa0 JT |
427 | { |
428 | int r; | |
429 | unsigned i; | |
430 | struct dm_block *b; | |
431 | __le64 *data_le, zero = cpu_to_le64(0); | |
432 | unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64); | |
433 | ||
434 | /* | |
435 | * We can't use a validator here - it may be all zeroes. | |
436 | */ | |
437 | r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b); | |
438 | if (r) | |
439 | return r; | |
440 | ||
441 | data_le = dm_block_data(b); | |
442 | *result = 1; | |
443 | for (i = 0; i < block_size; i++) { | |
444 | if (data_le[i] != zero) { | |
445 | *result = 0; | |
446 | break; | |
447 | } | |
448 | } | |
449 | ||
4c7da06f MP |
450 | dm_bm_unlock(b); |
451 | ||
452 | return 0; | |
991d9fa0 JT |
453 | } |
454 | ||
41675aea JT |
455 | static void __setup_btree_details(struct dm_pool_metadata *pmd) |
456 | { | |
457 | pmd->info.tm = pmd->tm; | |
458 | pmd->info.levels = 2; | |
459 | pmd->info.value_type.context = pmd->data_sm; | |
460 | pmd->info.value_type.size = sizeof(__le64); | |
461 | pmd->info.value_type.inc = data_block_inc; | |
462 | pmd->info.value_type.dec = data_block_dec; | |
463 | pmd->info.value_type.equal = data_block_equal; | |
464 | ||
465 | memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info)); | |
466 | pmd->nb_info.tm = pmd->nb_tm; | |
467 | ||
468 | pmd->tl_info.tm = pmd->tm; | |
469 | pmd->tl_info.levels = 1; | |
e3cbf945 | 470 | pmd->tl_info.value_type.context = &pmd->bl_info; |
41675aea JT |
471 | pmd->tl_info.value_type.size = sizeof(__le64); |
472 | pmd->tl_info.value_type.inc = subtree_inc; | |
473 | pmd->tl_info.value_type.dec = subtree_dec; | |
474 | pmd->tl_info.value_type.equal = subtree_equal; | |
475 | ||
476 | pmd->bl_info.tm = pmd->tm; | |
477 | pmd->bl_info.levels = 1; | |
478 | pmd->bl_info.value_type.context = pmd->data_sm; | |
479 | pmd->bl_info.value_type.size = sizeof(__le64); | |
480 | pmd->bl_info.value_type.inc = data_block_inc; | |
481 | pmd->bl_info.value_type.dec = data_block_dec; | |
482 | pmd->bl_info.value_type.equal = data_block_equal; | |
483 | ||
484 | pmd->details_info.tm = pmd->tm; | |
485 | pmd->details_info.levels = 1; | |
486 | pmd->details_info.value_type.context = NULL; | |
487 | pmd->details_info.value_type.size = sizeof(struct disk_device_details); | |
488 | pmd->details_info.value_type.inc = NULL; | |
489 | pmd->details_info.value_type.dec = NULL; | |
490 | pmd->details_info.value_type.equal = NULL; | |
491 | } | |
492 | ||
5a32083d JT |
493 | static int save_sm_roots(struct dm_pool_metadata *pmd) |
494 | { | |
495 | int r; | |
496 | size_t len; | |
497 | ||
498 | r = dm_sm_root_size(pmd->metadata_sm, &len); | |
499 | if (r < 0) | |
500 | return r; | |
501 | ||
502 | r = dm_sm_copy_root(pmd->metadata_sm, &pmd->metadata_space_map_root, len); | |
503 | if (r < 0) | |
504 | return r; | |
505 | ||
506 | r = dm_sm_root_size(pmd->data_sm, &len); | |
507 | if (r < 0) | |
508 | return r; | |
509 | ||
510 | return dm_sm_copy_root(pmd->data_sm, &pmd->data_space_map_root, len); | |
511 | } | |
512 | ||
513 | static void copy_sm_roots(struct dm_pool_metadata *pmd, | |
514 | struct thin_disk_superblock *disk) | |
515 | { | |
516 | memcpy(&disk->metadata_space_map_root, | |
517 | &pmd->metadata_space_map_root, | |
518 | sizeof(pmd->metadata_space_map_root)); | |
519 | ||
520 | memcpy(&disk->data_space_map_root, | |
521 | &pmd->data_space_map_root, | |
522 | sizeof(pmd->data_space_map_root)); | |
523 | } | |
524 | ||
9cb6653f JT |
525 | static int __write_initial_superblock(struct dm_pool_metadata *pmd) |
526 | { | |
527 | int r; | |
528 | struct dm_block *sblock; | |
529 | struct thin_disk_superblock *disk_super; | |
530 | sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT; | |
531 | ||
532 | if (bdev_size > THIN_METADATA_MAX_SECTORS) | |
533 | bdev_size = THIN_METADATA_MAX_SECTORS; | |
534 | ||
5a32083d | 535 | r = dm_sm_commit(pmd->data_sm); |
10d2a9ff JT |
536 | if (r < 0) |
537 | return r; | |
538 | ||
91bcdb92 | 539 | r = dm_tm_pre_commit(pmd->tm); |
10d2a9ff JT |
540 | if (r < 0) |
541 | return r; | |
542 | ||
91bcdb92 | 543 | r = save_sm_roots(pmd); |
10d2a9ff JT |
544 | if (r < 0) |
545 | return r; | |
546 | ||
9cb6653f JT |
547 | r = superblock_lock_zero(pmd, &sblock); |
548 | if (r) | |
549 | return r; | |
550 | ||
551 | disk_super = dm_block_data(sblock); | |
10d2a9ff | 552 | disk_super->flags = 0; |
583ceee2 | 553 | memset(disk_super->uuid, 0, sizeof(disk_super->uuid)); |
9cb6653f JT |
554 | disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC); |
555 | disk_super->version = cpu_to_le32(THIN_VERSION); | |
556 | disk_super->time = 0; | |
10d2a9ff JT |
557 | disk_super->trans_id = 0; |
558 | disk_super->held_root = 0; | |
559 | ||
5a32083d | 560 | copy_sm_roots(pmd, disk_super); |
10d2a9ff JT |
561 | |
562 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
563 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
7d48935e | 564 | disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE); |
9cb6653f JT |
565 | disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT); |
566 | disk_super->data_block_size = cpu_to_le32(pmd->data_block_size); | |
567 | ||
270938ba | 568 | return dm_tm_commit(pmd->tm, sblock); |
9cb6653f JT |
569 | } |
570 | ||
a97e5e6f | 571 | static int __format_metadata(struct dm_pool_metadata *pmd) |
991d9fa0 JT |
572 | { |
573 | int r; | |
384ef0e6 | 574 | |
e4d2205c JT |
575 | r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
576 | &pmd->tm, &pmd->metadata_sm); | |
577 | if (r < 0) { | |
578 | DMERR("tm_create_with_sm failed"); | |
579 | return r; | |
580 | } | |
991d9fa0 | 581 | |
a97e5e6f | 582 | pmd->data_sm = dm_sm_disk_create(pmd->tm, 0); |
e4d2205c JT |
583 | if (IS_ERR(pmd->data_sm)) { |
584 | DMERR("sm_disk_create failed"); | |
585 | r = PTR_ERR(pmd->data_sm); | |
0fa5b17b | 586 | goto bad_cleanup_tm; |
991d9fa0 JT |
587 | } |
588 | ||
d6332814 | 589 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
991d9fa0 | 590 | if (!pmd->nb_tm) { |
0fa5b17b | 591 | DMERR("could not create non-blocking clone tm"); |
991d9fa0 | 592 | r = -ENOMEM; |
0fa5b17b | 593 | goto bad_cleanup_data_sm; |
991d9fa0 JT |
594 | } |
595 | ||
41675aea | 596 | __setup_btree_details(pmd); |
991d9fa0 | 597 | |
9cb6653f JT |
598 | r = dm_btree_empty(&pmd->info, &pmd->root); |
599 | if (r < 0) | |
0fa5b17b | 600 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
601 | |
602 | r = dm_btree_empty(&pmd->details_info, &pmd->details_root); | |
603 | if (r < 0) { | |
604 | DMERR("couldn't create devices root"); | |
0fa5b17b | 605 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
606 | } |
607 | ||
608 | r = __write_initial_superblock(pmd); | |
609 | if (r) | |
0fa5b17b | 610 | goto bad_cleanup_nb_tm; |
9cb6653f | 611 | |
991d9fa0 JT |
612 | return 0; |
613 | ||
0fa5b17b JT |
614 | bad_cleanup_nb_tm: |
615 | dm_tm_destroy(pmd->nb_tm); | |
616 | bad_cleanup_data_sm: | |
d6332814 | 617 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 618 | bad_cleanup_tm: |
d6332814 JT |
619 | dm_tm_destroy(pmd->tm); |
620 | dm_sm_destroy(pmd->metadata_sm); | |
991d9fa0 JT |
621 | |
622 | return r; | |
623 | } | |
624 | ||
d73ec525 MS |
625 | static int __check_incompat_features(struct thin_disk_superblock *disk_super, |
626 | struct dm_pool_metadata *pmd) | |
627 | { | |
628 | uint32_t features; | |
629 | ||
630 | features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP; | |
631 | if (features) { | |
632 | DMERR("could not access metadata due to unsupported optional features (%lx).", | |
633 | (unsigned long)features); | |
634 | return -EINVAL; | |
635 | } | |
636 | ||
637 | /* | |
638 | * Check for read-only metadata to skip the following RDWR checks. | |
639 | */ | |
640 | if (get_disk_ro(pmd->bdev->bd_disk)) | |
641 | return 0; | |
642 | ||
643 | features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP; | |
644 | if (features) { | |
645 | DMERR("could not access metadata RDWR due to unsupported optional features (%lx).", | |
646 | (unsigned long)features); | |
647 | return -EINVAL; | |
648 | } | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
e4d2205c JT |
653 | static int __open_metadata(struct dm_pool_metadata *pmd) |
654 | { | |
655 | int r; | |
656 | struct dm_block *sblock; | |
657 | struct thin_disk_superblock *disk_super; | |
658 | ||
659 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
660 | &sb_validator, &sblock); | |
661 | if (r < 0) { | |
662 | DMERR("couldn't read superblock"); | |
663 | return r; | |
664 | } | |
665 | ||
666 | disk_super = dm_block_data(sblock); | |
d73ec525 | 667 | |
9aec8629 MS |
668 | /* Verify the data block size hasn't changed */ |
669 | if (le32_to_cpu(disk_super->data_block_size) != pmd->data_block_size) { | |
670 | DMERR("changing the data block size (from %u to %llu) is not supported", | |
671 | le32_to_cpu(disk_super->data_block_size), | |
672 | (unsigned long long)pmd->data_block_size); | |
673 | r = -EINVAL; | |
674 | goto bad_unlock_sblock; | |
675 | } | |
676 | ||
d73ec525 | 677 | r = __check_incompat_features(disk_super, pmd); |
0fa5b17b JT |
678 | if (r < 0) |
679 | goto bad_unlock_sblock; | |
d73ec525 | 680 | |
e4d2205c JT |
681 | r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
682 | disk_super->metadata_space_map_root, | |
683 | sizeof(disk_super->metadata_space_map_root), | |
684 | &pmd->tm, &pmd->metadata_sm); | |
685 | if (r < 0) { | |
686 | DMERR("tm_open_with_sm failed"); | |
0fa5b17b | 687 | goto bad_unlock_sblock; |
e4d2205c JT |
688 | } |
689 | ||
690 | pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root, | |
691 | sizeof(disk_super->data_space_map_root)); | |
692 | if (IS_ERR(pmd->data_sm)) { | |
693 | DMERR("sm_disk_open failed"); | |
e4d2205c | 694 | r = PTR_ERR(pmd->data_sm); |
0fa5b17b | 695 | goto bad_cleanup_tm; |
e4d2205c JT |
696 | } |
697 | ||
e4d2205c JT |
698 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
699 | if (!pmd->nb_tm) { | |
0fa5b17b | 700 | DMERR("could not create non-blocking clone tm"); |
e4d2205c | 701 | r = -ENOMEM; |
0fa5b17b | 702 | goto bad_cleanup_data_sm; |
e4d2205c JT |
703 | } |
704 | ||
705 | __setup_btree_details(pmd); | |
4c7da06f MP |
706 | dm_bm_unlock(sblock); |
707 | ||
708 | return 0; | |
e4d2205c | 709 | |
0fa5b17b | 710 | bad_cleanup_data_sm: |
e4d2205c | 711 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 712 | bad_cleanup_tm: |
e4d2205c JT |
713 | dm_tm_destroy(pmd->tm); |
714 | dm_sm_destroy(pmd->metadata_sm); | |
0fa5b17b JT |
715 | bad_unlock_sblock: |
716 | dm_bm_unlock(sblock); | |
e4d2205c JT |
717 | |
718 | return r; | |
719 | } | |
720 | ||
66b1edc0 | 721 | static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device) |
e4d2205c | 722 | { |
8801e069 | 723 | int r, unformatted; |
237074c0 | 724 | |
8801e069 | 725 | r = __superblock_all_zeroes(pmd->bm, &unformatted); |
237074c0 JT |
726 | if (r) |
727 | return r; | |
728 | ||
8801e069 | 729 | if (unformatted) |
66b1edc0 JT |
730 | return format_device ? __format_metadata(pmd) : -EPERM; |
731 | ||
732 | return __open_metadata(pmd); | |
e4d2205c JT |
733 | } |
734 | ||
66b1edc0 | 735 | static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device) |
332627db JT |
736 | { |
737 | int r; | |
738 | ||
7d48935e | 739 | pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT, |
332627db JT |
740 | THIN_MAX_CONCURRENT_LOCKS); |
741 | if (IS_ERR(pmd->bm)) { | |
742 | DMERR("could not create block manager"); | |
743 | return PTR_ERR(pmd->bm); | |
744 | } | |
745 | ||
66b1edc0 | 746 | r = __open_or_format_metadata(pmd, format_device); |
332627db JT |
747 | if (r) |
748 | dm_block_manager_destroy(pmd->bm); | |
749 | ||
750 | return r; | |
751 | } | |
752 | ||
f9dd9352 JT |
753 | static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd) |
754 | { | |
755 | dm_sm_destroy(pmd->data_sm); | |
756 | dm_sm_destroy(pmd->metadata_sm); | |
757 | dm_tm_destroy(pmd->nb_tm); | |
758 | dm_tm_destroy(pmd->tm); | |
759 | dm_block_manager_destroy(pmd->bm); | |
760 | } | |
761 | ||
991d9fa0 JT |
762 | static int __begin_transaction(struct dm_pool_metadata *pmd) |
763 | { | |
764 | int r; | |
991d9fa0 JT |
765 | struct thin_disk_superblock *disk_super; |
766 | struct dm_block *sblock; | |
767 | ||
991d9fa0 JT |
768 | /* |
769 | * We re-read the superblock every time. Shouldn't need to do this | |
770 | * really. | |
771 | */ | |
772 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
773 | &sb_validator, &sblock); | |
774 | if (r) | |
775 | return r; | |
776 | ||
777 | disk_super = dm_block_data(sblock); | |
778 | pmd->time = le32_to_cpu(disk_super->time); | |
779 | pmd->root = le64_to_cpu(disk_super->data_mapping_root); | |
780 | pmd->details_root = le64_to_cpu(disk_super->device_details_root); | |
781 | pmd->trans_id = le64_to_cpu(disk_super->trans_id); | |
782 | pmd->flags = le32_to_cpu(disk_super->flags); | |
783 | pmd->data_block_size = le32_to_cpu(disk_super->data_block_size); | |
784 | ||
991d9fa0 | 785 | dm_bm_unlock(sblock); |
d73ec525 | 786 | return 0; |
991d9fa0 JT |
787 | } |
788 | ||
789 | static int __write_changed_details(struct dm_pool_metadata *pmd) | |
790 | { | |
791 | int r; | |
792 | struct dm_thin_device *td, *tmp; | |
793 | struct disk_device_details details; | |
794 | uint64_t key; | |
795 | ||
796 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
797 | if (!td->changed) | |
798 | continue; | |
799 | ||
800 | key = td->id; | |
801 | ||
802 | details.mapped_blocks = cpu_to_le64(td->mapped_blocks); | |
803 | details.transaction_id = cpu_to_le64(td->transaction_id); | |
804 | details.creation_time = cpu_to_le32(td->creation_time); | |
805 | details.snapshotted_time = cpu_to_le32(td->snapshotted_time); | |
806 | __dm_bless_for_disk(&details); | |
807 | ||
808 | r = dm_btree_insert(&pmd->details_info, pmd->details_root, | |
809 | &key, &details, &pmd->details_root); | |
810 | if (r) | |
811 | return r; | |
812 | ||
813 | if (td->open_count) | |
63ee92d1 | 814 | td->changed = false; |
991d9fa0 JT |
815 | else { |
816 | list_del(&td->list); | |
817 | kfree(td); | |
818 | } | |
991d9fa0 JT |
819 | } |
820 | ||
821 | return 0; | |
822 | } | |
823 | ||
824 | static int __commit_transaction(struct dm_pool_metadata *pmd) | |
825 | { | |
991d9fa0 | 826 | int r; |
991d9fa0 JT |
827 | struct thin_disk_superblock *disk_super; |
828 | struct dm_block *sblock; | |
829 | ||
830 | /* | |
831 | * We need to know if the thin_disk_superblock exceeds a 512-byte sector. | |
832 | */ | |
833 | BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512); | |
834 | ||
873f258b MS |
835 | if (unlikely(!pmd->in_service)) |
836 | return 0; | |
837 | ||
ecda7c02 NT |
838 | if (pmd->pre_commit_fn) { |
839 | r = pmd->pre_commit_fn(pmd->pre_commit_context); | |
840 | if (r < 0) { | |
841 | DMERR("pre-commit callback failed"); | |
842 | return r; | |
843 | } | |
844 | } | |
845 | ||
991d9fa0 JT |
846 | r = __write_changed_details(pmd); |
847 | if (r < 0) | |
d973ac19 | 848 | return r; |
991d9fa0 | 849 | |
991d9fa0 JT |
850 | r = dm_sm_commit(pmd->data_sm); |
851 | if (r < 0) | |
d973ac19 | 852 | return r; |
991d9fa0 JT |
853 | |
854 | r = dm_tm_pre_commit(pmd->tm); | |
855 | if (r < 0) | |
d973ac19 | 856 | return r; |
991d9fa0 | 857 | |
5a32083d JT |
858 | r = save_sm_roots(pmd); |
859 | if (r < 0) | |
860 | return r; | |
861 | ||
25971192 | 862 | r = superblock_lock(pmd, &sblock); |
991d9fa0 | 863 | if (r) |
d973ac19 | 864 | return r; |
991d9fa0 JT |
865 | |
866 | disk_super = dm_block_data(sblock); | |
867 | disk_super->time = cpu_to_le32(pmd->time); | |
868 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
869 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
870 | disk_super->trans_id = cpu_to_le64(pmd->trans_id); | |
871 | disk_super->flags = cpu_to_le32(pmd->flags); | |
872 | ||
5a32083d | 873 | copy_sm_roots(pmd, disk_super); |
991d9fa0 | 874 | |
eb04cf63 | 875 | return dm_tm_commit(pmd->tm, sblock); |
991d9fa0 JT |
876 | } |
877 | ||
3ab91828 JT |
878 | static void __set_metadata_reserve(struct dm_pool_metadata *pmd) |
879 | { | |
880 | int r; | |
881 | dm_block_t total; | |
882 | dm_block_t max_blocks = 4096; /* 16M */ | |
883 | ||
884 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, &total); | |
885 | if (r) { | |
886 | DMERR("could not get size of metadata device"); | |
887 | pmd->metadata_reserve = max_blocks; | |
013ad043 MS |
888 | } else |
889 | pmd->metadata_reserve = min(max_blocks, div_u64(total, 10)); | |
3ab91828 JT |
890 | } |
891 | ||
991d9fa0 | 892 | struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, |
66b1edc0 JT |
893 | sector_t data_block_size, |
894 | bool format_device) | |
991d9fa0 JT |
895 | { |
896 | int r; | |
991d9fa0 | 897 | struct dm_pool_metadata *pmd; |
991d9fa0 JT |
898 | |
899 | pmd = kmalloc(sizeof(*pmd), GFP_KERNEL); | |
900 | if (!pmd) { | |
901 | DMERR("could not allocate metadata struct"); | |
902 | return ERR_PTR(-ENOMEM); | |
903 | } | |
904 | ||
6a0ebd31 JT |
905 | init_rwsem(&pmd->root_lock); |
906 | pmd->time = 0; | |
907 | INIT_LIST_HEAD(&pmd->thin_devices); | |
da105ed5 | 908 | pmd->fail_io = false; |
873f258b | 909 | pmd->in_service = false; |
332627db | 910 | pmd->bdev = bdev; |
9cb6653f | 911 | pmd->data_block_size = data_block_size; |
ecda7c02 NT |
912 | pmd->pre_commit_fn = NULL; |
913 | pmd->pre_commit_context = NULL; | |
991d9fa0 | 914 | |
66b1edc0 | 915 | r = __create_persistent_data_objects(pmd, format_device); |
991d9fa0 | 916 | if (r) { |
991d9fa0 JT |
917 | kfree(pmd); |
918 | return ERR_PTR(r); | |
919 | } | |
991d9fa0 | 920 | |
270938ba JT |
921 | r = __begin_transaction(pmd); |
922 | if (r < 0) { | |
923 | if (dm_pool_metadata_close(pmd) < 0) | |
924 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); | |
925 | return ERR_PTR(r); | |
991d9fa0 JT |
926 | } |
927 | ||
3ab91828 JT |
928 | __set_metadata_reserve(pmd); |
929 | ||
991d9fa0 | 930 | return pmd; |
991d9fa0 JT |
931 | } |
932 | ||
933 | int dm_pool_metadata_close(struct dm_pool_metadata *pmd) | |
934 | { | |
935 | int r; | |
936 | unsigned open_devices = 0; | |
937 | struct dm_thin_device *td, *tmp; | |
938 | ||
939 | down_read(&pmd->root_lock); | |
940 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
941 | if (td->open_count) | |
942 | open_devices++; | |
943 | else { | |
944 | list_del(&td->list); | |
945 | kfree(td); | |
946 | } | |
947 | } | |
948 | up_read(&pmd->root_lock); | |
949 | ||
950 | if (open_devices) { | |
951 | DMERR("attempt to close pmd when %u device(s) are still open", | |
952 | open_devices); | |
953 | return -EBUSY; | |
954 | } | |
955 | ||
49f154c7 | 956 | if (!dm_bm_is_read_only(pmd->bm) && !pmd->fail_io) { |
12ba58af JT |
957 | r = __commit_transaction(pmd); |
958 | if (r < 0) | |
959 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
960 | __func__, r); | |
961 | } | |
da105ed5 JT |
962 | if (!pmd->fail_io) |
963 | __destroy_persistent_data_objects(pmd); | |
991d9fa0 | 964 | |
da105ed5 | 965 | kfree(pmd); |
991d9fa0 JT |
966 | return 0; |
967 | } | |
968 | ||
1f3db25d MS |
969 | /* |
970 | * __open_device: Returns @td corresponding to device with id @dev, | |
971 | * creating it if @create is set and incrementing @td->open_count. | |
972 | * On failure, @td is undefined. | |
973 | */ | |
991d9fa0 JT |
974 | static int __open_device(struct dm_pool_metadata *pmd, |
975 | dm_thin_id dev, int create, | |
976 | struct dm_thin_device **td) | |
977 | { | |
978 | int r, changed = 0; | |
979 | struct dm_thin_device *td2; | |
980 | uint64_t key = dev; | |
981 | struct disk_device_details details_le; | |
982 | ||
983 | /* | |
1f3db25d | 984 | * If the device is already open, return it. |
991d9fa0 JT |
985 | */ |
986 | list_for_each_entry(td2, &pmd->thin_devices, list) | |
987 | if (td2->id == dev) { | |
1f3db25d MS |
988 | /* |
989 | * May not create an already-open device. | |
990 | */ | |
991 | if (create) | |
992 | return -EEXIST; | |
993 | ||
991d9fa0 JT |
994 | td2->open_count++; |
995 | *td = td2; | |
996 | return 0; | |
997 | } | |
998 | ||
999 | /* | |
1000 | * Check the device exists. | |
1001 | */ | |
1002 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
1003 | &key, &details_le); | |
1004 | if (r) { | |
1005 | if (r != -ENODATA || !create) | |
1006 | return r; | |
1007 | ||
1f3db25d MS |
1008 | /* |
1009 | * Create new device. | |
1010 | */ | |
991d9fa0 JT |
1011 | changed = 1; |
1012 | details_le.mapped_blocks = 0; | |
1013 | details_le.transaction_id = cpu_to_le64(pmd->trans_id); | |
1014 | details_le.creation_time = cpu_to_le32(pmd->time); | |
1015 | details_le.snapshotted_time = cpu_to_le32(pmd->time); | |
1016 | } | |
1017 | ||
1018 | *td = kmalloc(sizeof(**td), GFP_NOIO); | |
1019 | if (!*td) | |
1020 | return -ENOMEM; | |
1021 | ||
1022 | (*td)->pmd = pmd; | |
1023 | (*td)->id = dev; | |
1024 | (*td)->open_count = 1; | |
1025 | (*td)->changed = changed; | |
da105ed5 | 1026 | (*td)->aborted_with_changes = false; |
991d9fa0 JT |
1027 | (*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks); |
1028 | (*td)->transaction_id = le64_to_cpu(details_le.transaction_id); | |
1029 | (*td)->creation_time = le32_to_cpu(details_le.creation_time); | |
1030 | (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time); | |
1031 | ||
1032 | list_add(&(*td)->list, &pmd->thin_devices); | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | static void __close_device(struct dm_thin_device *td) | |
1038 | { | |
1039 | --td->open_count; | |
1040 | } | |
1041 | ||
1042 | static int __create_thin(struct dm_pool_metadata *pmd, | |
1043 | dm_thin_id dev) | |
1044 | { | |
1045 | int r; | |
1046 | dm_block_t dev_root; | |
1047 | uint64_t key = dev; | |
1048 | struct disk_device_details details_le; | |
1049 | struct dm_thin_device *td; | |
1050 | __le64 value; | |
1051 | ||
1052 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
1053 | &key, &details_le); | |
1054 | if (!r) | |
1055 | return -EEXIST; | |
1056 | ||
1057 | /* | |
1058 | * Create an empty btree for the mappings. | |
1059 | */ | |
1060 | r = dm_btree_empty(&pmd->bl_info, &dev_root); | |
1061 | if (r) | |
1062 | return r; | |
1063 | ||
1064 | /* | |
1065 | * Insert it into the main mapping tree. | |
1066 | */ | |
1067 | value = cpu_to_le64(dev_root); | |
1068 | __dm_bless_for_disk(&value); | |
1069 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1070 | if (r) { | |
1071 | dm_btree_del(&pmd->bl_info, dev_root); | |
1072 | return r; | |
1073 | } | |
1074 | ||
1075 | r = __open_device(pmd, dev, 1, &td); | |
1076 | if (r) { | |
991d9fa0 JT |
1077 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1078 | dm_btree_del(&pmd->bl_info, dev_root); | |
1079 | return r; | |
1080 | } | |
991d9fa0 JT |
1081 | __close_device(td); |
1082 | ||
1083 | return r; | |
1084 | } | |
1085 | ||
1086 | int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1087 | { | |
da105ed5 | 1088 | int r = -EINVAL; |
991d9fa0 | 1089 | |
6a1b1ddc | 1090 | pmd_write_lock(pmd); |
da105ed5 JT |
1091 | if (!pmd->fail_io) |
1092 | r = __create_thin(pmd, dev); | |
6a1b1ddc | 1093 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1094 | |
1095 | return r; | |
1096 | } | |
1097 | ||
1098 | static int __set_snapshot_details(struct dm_pool_metadata *pmd, | |
1099 | struct dm_thin_device *snap, | |
1100 | dm_thin_id origin, uint32_t time) | |
1101 | { | |
1102 | int r; | |
1103 | struct dm_thin_device *td; | |
1104 | ||
1105 | r = __open_device(pmd, origin, 0, &td); | |
1106 | if (r) | |
1107 | return r; | |
1108 | ||
63ee92d1 | 1109 | td->changed = true; |
991d9fa0 JT |
1110 | td->snapshotted_time = time; |
1111 | ||
1112 | snap->mapped_blocks = td->mapped_blocks; | |
1113 | snap->snapshotted_time = time; | |
1114 | __close_device(td); | |
1115 | ||
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | static int __create_snap(struct dm_pool_metadata *pmd, | |
1120 | dm_thin_id dev, dm_thin_id origin) | |
1121 | { | |
1122 | int r; | |
1123 | dm_block_t origin_root; | |
1124 | uint64_t key = origin, dev_key = dev; | |
1125 | struct dm_thin_device *td; | |
1126 | struct disk_device_details details_le; | |
1127 | __le64 value; | |
1128 | ||
1129 | /* check this device is unused */ | |
1130 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
1131 | &dev_key, &details_le); | |
1132 | if (!r) | |
1133 | return -EEXIST; | |
1134 | ||
1135 | /* find the mapping tree for the origin */ | |
1136 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value); | |
1137 | if (r) | |
1138 | return r; | |
1139 | origin_root = le64_to_cpu(value); | |
1140 | ||
1141 | /* clone the origin, an inc will do */ | |
1142 | dm_tm_inc(pmd->tm, origin_root); | |
1143 | ||
1144 | /* insert into the main mapping tree */ | |
1145 | value = cpu_to_le64(origin_root); | |
1146 | __dm_bless_for_disk(&value); | |
1147 | key = dev; | |
1148 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1149 | if (r) { | |
1150 | dm_tm_dec(pmd->tm, origin_root); | |
1151 | return r; | |
1152 | } | |
1153 | ||
1154 | pmd->time++; | |
1155 | ||
1156 | r = __open_device(pmd, dev, 1, &td); | |
1157 | if (r) | |
1158 | goto bad; | |
1159 | ||
1160 | r = __set_snapshot_details(pmd, td, origin, pmd->time); | |
1f3db25d MS |
1161 | __close_device(td); |
1162 | ||
991d9fa0 JT |
1163 | if (r) |
1164 | goto bad; | |
1165 | ||
991d9fa0 JT |
1166 | return 0; |
1167 | ||
1168 | bad: | |
991d9fa0 JT |
1169 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1170 | dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1171 | &key, &pmd->details_root); | |
1172 | return r; | |
1173 | } | |
1174 | ||
1175 | int dm_pool_create_snap(struct dm_pool_metadata *pmd, | |
1176 | dm_thin_id dev, | |
1177 | dm_thin_id origin) | |
1178 | { | |
da105ed5 | 1179 | int r = -EINVAL; |
991d9fa0 | 1180 | |
6a1b1ddc | 1181 | pmd_write_lock(pmd); |
da105ed5 JT |
1182 | if (!pmd->fail_io) |
1183 | r = __create_snap(pmd, dev, origin); | |
6a1b1ddc | 1184 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1185 | |
1186 | return r; | |
1187 | } | |
1188 | ||
1189 | static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1190 | { | |
1191 | int r; | |
1192 | uint64_t key = dev; | |
1193 | struct dm_thin_device *td; | |
1194 | ||
1195 | /* TODO: failure should mark the transaction invalid */ | |
1196 | r = __open_device(pmd, dev, 0, &td); | |
1197 | if (r) | |
1198 | return r; | |
1199 | ||
1200 | if (td->open_count > 1) { | |
1201 | __close_device(td); | |
1202 | return -EBUSY; | |
1203 | } | |
1204 | ||
1205 | list_del(&td->list); | |
1206 | kfree(td); | |
1207 | r = dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1208 | &key, &pmd->details_root); | |
1209 | if (r) | |
1210 | return r; | |
1211 | ||
1212 | r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); | |
1213 | if (r) | |
1214 | return r; | |
1215 | ||
991d9fa0 JT |
1216 | return 0; |
1217 | } | |
1218 | ||
1219 | int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, | |
1220 | dm_thin_id dev) | |
1221 | { | |
da105ed5 | 1222 | int r = -EINVAL; |
991d9fa0 | 1223 | |
6a1b1ddc | 1224 | pmd_write_lock(pmd); |
da105ed5 JT |
1225 | if (!pmd->fail_io) |
1226 | r = __delete_device(pmd, dev); | |
6a1b1ddc | 1227 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1228 | |
1229 | return r; | |
1230 | } | |
1231 | ||
1232 | int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1233 | uint64_t current_id, | |
1234 | uint64_t new_id) | |
1235 | { | |
da105ed5 JT |
1236 | int r = -EINVAL; |
1237 | ||
6a1b1ddc | 1238 | pmd_write_lock(pmd); |
da105ed5 JT |
1239 | |
1240 | if (pmd->fail_io) | |
1241 | goto out; | |
1242 | ||
991d9fa0 | 1243 | if (pmd->trans_id != current_id) { |
991d9fa0 | 1244 | DMERR("mismatched transaction id"); |
da105ed5 | 1245 | goto out; |
991d9fa0 JT |
1246 | } |
1247 | ||
1248 | pmd->trans_id = new_id; | |
da105ed5 JT |
1249 | r = 0; |
1250 | ||
1251 | out: | |
6a1b1ddc | 1252 | pmd_write_unlock(pmd); |
991d9fa0 | 1253 | |
da105ed5 | 1254 | return r; |
991d9fa0 JT |
1255 | } |
1256 | ||
1257 | int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1258 | uint64_t *result) | |
1259 | { | |
da105ed5 JT |
1260 | int r = -EINVAL; |
1261 | ||
991d9fa0 | 1262 | down_read(&pmd->root_lock); |
da105ed5 JT |
1263 | if (!pmd->fail_io) { |
1264 | *result = pmd->trans_id; | |
1265 | r = 0; | |
1266 | } | |
991d9fa0 JT |
1267 | up_read(&pmd->root_lock); |
1268 | ||
da105ed5 | 1269 | return r; |
991d9fa0 JT |
1270 | } |
1271 | ||
cc8394d8 JT |
1272 | static int __reserve_metadata_snap(struct dm_pool_metadata *pmd) |
1273 | { | |
1274 | int r, inc; | |
1275 | struct thin_disk_superblock *disk_super; | |
1276 | struct dm_block *copy, *sblock; | |
1277 | dm_block_t held_root; | |
1278 | ||
49e99fc7 JT |
1279 | /* |
1280 | * We commit to ensure the btree roots which we increment in a | |
1281 | * moment are up to date. | |
1282 | */ | |
a1ed4d9e MS |
1283 | r = __commit_transaction(pmd); |
1284 | if (r < 0) { | |
1285 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
1286 | __func__, r); | |
1287 | return r; | |
1288 | } | |
49e99fc7 | 1289 | |
cc8394d8 JT |
1290 | /* |
1291 | * Copy the superblock. | |
1292 | */ | |
1293 | dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION); | |
1294 | r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION, | |
1295 | &sb_validator, ©, &inc); | |
1296 | if (r) | |
1297 | return r; | |
1298 | ||
1299 | BUG_ON(!inc); | |
1300 | ||
1301 | held_root = dm_block_location(copy); | |
1302 | disk_super = dm_block_data(copy); | |
1303 | ||
1304 | if (le64_to_cpu(disk_super->held_root)) { | |
1305 | DMWARN("Pool metadata snapshot already exists: release this before taking another."); | |
1306 | ||
1307 | dm_tm_dec(pmd->tm, held_root); | |
1308 | dm_tm_unlock(pmd->tm, copy); | |
cc8394d8 JT |
1309 | return -EBUSY; |
1310 | } | |
1311 | ||
1312 | /* | |
1313 | * Wipe the spacemap since we're not publishing this. | |
1314 | */ | |
1315 | memset(&disk_super->data_space_map_root, 0, | |
1316 | sizeof(disk_super->data_space_map_root)); | |
1317 | memset(&disk_super->metadata_space_map_root, 0, | |
1318 | sizeof(disk_super->metadata_space_map_root)); | |
1319 | ||
1320 | /* | |
1321 | * Increment the data structures that need to be preserved. | |
1322 | */ | |
1323 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root)); | |
1324 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root)); | |
1325 | dm_tm_unlock(pmd->tm, copy); | |
1326 | ||
1327 | /* | |
1328 | * Write the held root into the superblock. | |
1329 | */ | |
25971192 | 1330 | r = superblock_lock(pmd, &sblock); |
cc8394d8 JT |
1331 | if (r) { |
1332 | dm_tm_dec(pmd->tm, held_root); | |
cc8394d8 JT |
1333 | return r; |
1334 | } | |
1335 | ||
1336 | disk_super = dm_block_data(sblock); | |
1337 | disk_super->held_root = cpu_to_le64(held_root); | |
1338 | dm_bm_unlock(sblock); | |
cc8394d8 JT |
1339 | return 0; |
1340 | } | |
1341 | ||
1342 | int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd) | |
1343 | { | |
da105ed5 | 1344 | int r = -EINVAL; |
cc8394d8 | 1345 | |
6a1b1ddc | 1346 | pmd_write_lock(pmd); |
da105ed5 JT |
1347 | if (!pmd->fail_io) |
1348 | r = __reserve_metadata_snap(pmd); | |
6a1b1ddc | 1349 | pmd_write_unlock(pmd); |
cc8394d8 JT |
1350 | |
1351 | return r; | |
1352 | } | |
1353 | ||
1354 | static int __release_metadata_snap(struct dm_pool_metadata *pmd) | |
991d9fa0 JT |
1355 | { |
1356 | int r; | |
1357 | struct thin_disk_superblock *disk_super; | |
cc8394d8 JT |
1358 | struct dm_block *sblock, *copy; |
1359 | dm_block_t held_root; | |
991d9fa0 | 1360 | |
25971192 | 1361 | r = superblock_lock(pmd, &sblock); |
991d9fa0 JT |
1362 | if (r) |
1363 | return r; | |
1364 | ||
cc8394d8 JT |
1365 | disk_super = dm_block_data(sblock); |
1366 | held_root = le64_to_cpu(disk_super->held_root); | |
1367 | disk_super->held_root = cpu_to_le64(0); | |
cc8394d8 JT |
1368 | |
1369 | dm_bm_unlock(sblock); | |
1370 | ||
1371 | if (!held_root) { | |
1372 | DMWARN("No pool metadata snapshot found: nothing to release."); | |
1373 | return -EINVAL; | |
1374 | } | |
1375 | ||
1376 | r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, ©); | |
1377 | if (r) | |
1378 | return r; | |
1379 | ||
1380 | disk_super = dm_block_data(copy); | |
7f518ad0 JT |
1381 | dm_btree_del(&pmd->info, le64_to_cpu(disk_super->data_mapping_root)); |
1382 | dm_btree_del(&pmd->details_info, le64_to_cpu(disk_super->device_details_root)); | |
cc8394d8 JT |
1383 | dm_sm_dec_block(pmd->metadata_sm, held_root); |
1384 | ||
4c7da06f MP |
1385 | dm_tm_unlock(pmd->tm, copy); |
1386 | ||
1387 | return 0; | |
cc8394d8 JT |
1388 | } |
1389 | ||
1390 | int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd) | |
1391 | { | |
da105ed5 | 1392 | int r = -EINVAL; |
cc8394d8 | 1393 | |
6a1b1ddc | 1394 | pmd_write_lock(pmd); |
da105ed5 JT |
1395 | if (!pmd->fail_io) |
1396 | r = __release_metadata_snap(pmd); | |
6a1b1ddc | 1397 | pmd_write_unlock(pmd); |
cc8394d8 JT |
1398 | |
1399 | return r; | |
1400 | } | |
1401 | ||
1402 | static int __get_metadata_snap(struct dm_pool_metadata *pmd, | |
1403 | dm_block_t *result) | |
1404 | { | |
1405 | int r; | |
1406 | struct thin_disk_superblock *disk_super; | |
1407 | struct dm_block *sblock; | |
1408 | ||
1409 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
1410 | &sb_validator, &sblock); | |
1411 | if (r) | |
1412 | return r; | |
1413 | ||
991d9fa0 JT |
1414 | disk_super = dm_block_data(sblock); |
1415 | *result = le64_to_cpu(disk_super->held_root); | |
1416 | ||
4c7da06f MP |
1417 | dm_bm_unlock(sblock); |
1418 | ||
1419 | return 0; | |
991d9fa0 JT |
1420 | } |
1421 | ||
cc8394d8 JT |
1422 | int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd, |
1423 | dm_block_t *result) | |
991d9fa0 | 1424 | { |
da105ed5 | 1425 | int r = -EINVAL; |
991d9fa0 JT |
1426 | |
1427 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1428 | if (!pmd->fail_io) |
1429 | r = __get_metadata_snap(pmd, result); | |
991d9fa0 JT |
1430 | up_read(&pmd->root_lock); |
1431 | ||
1432 | return r; | |
1433 | } | |
1434 | ||
1435 | int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, | |
1436 | struct dm_thin_device **td) | |
1437 | { | |
da105ed5 | 1438 | int r = -EINVAL; |
991d9fa0 | 1439 | |
6a1b1ddc | 1440 | pmd_write_lock_in_core(pmd); |
da105ed5 JT |
1441 | if (!pmd->fail_io) |
1442 | r = __open_device(pmd, dev, 0, td); | |
6a1b1ddc | 1443 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1444 | |
1445 | return r; | |
1446 | } | |
1447 | ||
1448 | int dm_pool_close_thin_device(struct dm_thin_device *td) | |
1449 | { | |
6a1b1ddc | 1450 | pmd_write_lock_in_core(td->pmd); |
991d9fa0 | 1451 | __close_device(td); |
6a1b1ddc | 1452 | pmd_write_unlock(td->pmd); |
991d9fa0 JT |
1453 | |
1454 | return 0; | |
1455 | } | |
1456 | ||
1457 | dm_thin_id dm_thin_dev_id(struct dm_thin_device *td) | |
1458 | { | |
1459 | return td->id; | |
1460 | } | |
1461 | ||
19fa1a67 JT |
1462 | /* |
1463 | * Check whether @time (of block creation) is older than @td's last snapshot. | |
1464 | * If so then the associated block is shared with the last snapshot device. | |
1465 | * Any block on a device created *after* the device last got snapshotted is | |
1466 | * necessarily not shared. | |
1467 | */ | |
17b7d63f | 1468 | static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time) |
991d9fa0 JT |
1469 | { |
1470 | return td->snapshotted_time > time; | |
1471 | } | |
1472 | ||
3d5f6733 JT |
1473 | static void unpack_lookup_result(struct dm_thin_device *td, __le64 value, |
1474 | struct dm_thin_lookup_result *result) | |
1475 | { | |
1476 | uint64_t block_time = 0; | |
1477 | dm_block_t exception_block; | |
1478 | uint32_t exception_time; | |
1479 | ||
1480 | block_time = le64_to_cpu(value); | |
1481 | unpack_block_time(block_time, &exception_block, &exception_time); | |
1482 | result->block = exception_block; | |
1483 | result->shared = __snapshotted_since(td, exception_time); | |
1484 | } | |
1485 | ||
086fbbbd JT |
1486 | static int __find_block(struct dm_thin_device *td, dm_block_t block, |
1487 | int can_issue_io, struct dm_thin_lookup_result *result) | |
991d9fa0 | 1488 | { |
e5cfc69a | 1489 | int r; |
991d9fa0 JT |
1490 | __le64 value; |
1491 | struct dm_pool_metadata *pmd = td->pmd; | |
1492 | dm_block_t keys[2] = { td->id, block }; | |
da105ed5 | 1493 | struct dm_btree_info *info; |
991d9fa0 | 1494 | |
e5cfc69a JT |
1495 | if (can_issue_io) { |
1496 | info = &pmd->info; | |
1497 | } else | |
1498 | info = &pmd->nb_info; | |
da105ed5 | 1499 | |
e5cfc69a | 1500 | r = dm_btree_lookup(info, pmd->root, keys, &value); |
3d5f6733 JT |
1501 | if (!r) |
1502 | unpack_lookup_result(td, value, result); | |
1503 | ||
3d5f6733 JT |
1504 | return r; |
1505 | } | |
1506 | ||
086fbbbd JT |
1507 | int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, |
1508 | int can_issue_io, struct dm_thin_lookup_result *result) | |
3d5f6733 JT |
1509 | { |
1510 | int r; | |
3d5f6733 | 1511 | struct dm_pool_metadata *pmd = td->pmd; |
3d5f6733 JT |
1512 | |
1513 | down_read(&pmd->root_lock); | |
1514 | if (pmd->fail_io) { | |
1515 | up_read(&pmd->root_lock); | |
1516 | return -EINVAL; | |
991d9fa0 JT |
1517 | } |
1518 | ||
086fbbbd JT |
1519 | r = __find_block(td, block, can_issue_io, result); |
1520 | ||
1521 | up_read(&pmd->root_lock); | |
1522 | return r; | |
1523 | } | |
1524 | ||
1525 | static int __find_next_mapped_block(struct dm_thin_device *td, dm_block_t block, | |
1526 | dm_block_t *vblock, | |
1527 | struct dm_thin_lookup_result *result) | |
1528 | { | |
1529 | int r; | |
1530 | __le64 value; | |
1531 | struct dm_pool_metadata *pmd = td->pmd; | |
1532 | dm_block_t keys[2] = { td->id, block }; | |
1533 | ||
3d5f6733 JT |
1534 | r = dm_btree_lookup_next(&pmd->info, pmd->root, keys, vblock, &value); |
1535 | if (!r) | |
1536 | unpack_lookup_result(td, value, result); | |
1537 | ||
991d9fa0 JT |
1538 | return r; |
1539 | } | |
1540 | ||
086fbbbd JT |
1541 | static int __find_mapped_range(struct dm_thin_device *td, |
1542 | dm_block_t begin, dm_block_t end, | |
1543 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1544 | dm_block_t *pool_begin, bool *maybe_shared) | |
a5d895a9 JT |
1545 | { |
1546 | int r; | |
1547 | dm_block_t pool_end; | |
1548 | struct dm_thin_lookup_result lookup; | |
1549 | ||
1550 | if (end < begin) | |
1551 | return -ENODATA; | |
1552 | ||
086fbbbd | 1553 | r = __find_next_mapped_block(td, begin, &begin, &lookup); |
3d5f6733 JT |
1554 | if (r) |
1555 | return r; | |
a5d895a9 | 1556 | |
3d5f6733 | 1557 | if (begin >= end) |
a5d895a9 JT |
1558 | return -ENODATA; |
1559 | ||
1560 | *thin_begin = begin; | |
1561 | *pool_begin = lookup.block; | |
1562 | *maybe_shared = lookup.shared; | |
1563 | ||
1564 | begin++; | |
1565 | pool_end = *pool_begin + 1; | |
1566 | while (begin != end) { | |
086fbbbd | 1567 | r = __find_block(td, begin, true, &lookup); |
a5d895a9 JT |
1568 | if (r) { |
1569 | if (r == -ENODATA) | |
1570 | break; | |
1571 | else | |
1572 | return r; | |
1573 | } | |
1574 | ||
1575 | if ((lookup.block != pool_end) || | |
1576 | (lookup.shared != *maybe_shared)) | |
1577 | break; | |
1578 | ||
1579 | pool_end++; | |
1580 | begin++; | |
1581 | } | |
1582 | ||
1583 | *thin_end = begin; | |
1584 | return 0; | |
1585 | } | |
1586 | ||
086fbbbd JT |
1587 | int dm_thin_find_mapped_range(struct dm_thin_device *td, |
1588 | dm_block_t begin, dm_block_t end, | |
1589 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1590 | dm_block_t *pool_begin, bool *maybe_shared) | |
1591 | { | |
1592 | int r = -EINVAL; | |
1593 | struct dm_pool_metadata *pmd = td->pmd; | |
1594 | ||
1595 | down_read(&pmd->root_lock); | |
1596 | if (!pmd->fail_io) { | |
1597 | r = __find_mapped_range(td, begin, end, thin_begin, thin_end, | |
1598 | pool_begin, maybe_shared); | |
1599 | } | |
1600 | up_read(&pmd->root_lock); | |
1601 | ||
1602 | return r; | |
1603 | } | |
1604 | ||
991d9fa0 JT |
1605 | static int __insert(struct dm_thin_device *td, dm_block_t block, |
1606 | dm_block_t data_block) | |
1607 | { | |
1608 | int r, inserted; | |
1609 | __le64 value; | |
1610 | struct dm_pool_metadata *pmd = td->pmd; | |
1611 | dm_block_t keys[2] = { td->id, block }; | |
1612 | ||
991d9fa0 JT |
1613 | value = cpu_to_le64(pack_block_time(data_block, pmd->time)); |
1614 | __dm_bless_for_disk(&value); | |
1615 | ||
1616 | r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value, | |
1617 | &pmd->root, &inserted); | |
1618 | if (r) | |
1619 | return r; | |
1620 | ||
63ee92d1 | 1621 | td->changed = true; |
40db5a53 | 1622 | if (inserted) |
991d9fa0 | 1623 | td->mapped_blocks++; |
991d9fa0 JT |
1624 | |
1625 | return 0; | |
1626 | } | |
1627 | ||
1628 | int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, | |
1629 | dm_block_t data_block) | |
1630 | { | |
da105ed5 | 1631 | int r = -EINVAL; |
991d9fa0 | 1632 | |
6a1b1ddc | 1633 | pmd_write_lock(td->pmd); |
da105ed5 JT |
1634 | if (!td->pmd->fail_io) |
1635 | r = __insert(td, block, data_block); | |
6a1b1ddc | 1636 | pmd_write_unlock(td->pmd); |
991d9fa0 JT |
1637 | |
1638 | return r; | |
1639 | } | |
1640 | ||
1641 | static int __remove(struct dm_thin_device *td, dm_block_t block) | |
1642 | { | |
1643 | int r; | |
1644 | struct dm_pool_metadata *pmd = td->pmd; | |
1645 | dm_block_t keys[2] = { td->id, block }; | |
1646 | ||
1647 | r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root); | |
1648 | if (r) | |
1649 | return r; | |
1650 | ||
af63bcb8 | 1651 | td->mapped_blocks--; |
63ee92d1 | 1652 | td->changed = true; |
991d9fa0 JT |
1653 | |
1654 | return 0; | |
1655 | } | |
1656 | ||
6550f075 JT |
1657 | static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end) |
1658 | { | |
1659 | int r; | |
993ceab9 | 1660 | unsigned count, total_count = 0; |
6550f075 JT |
1661 | struct dm_pool_metadata *pmd = td->pmd; |
1662 | dm_block_t keys[1] = { td->id }; | |
1663 | __le64 value; | |
1664 | dm_block_t mapping_root; | |
1665 | ||
1666 | /* | |
1667 | * Find the mapping tree | |
1668 | */ | |
1669 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value); | |
1670 | if (r) | |
1671 | return r; | |
1672 | ||
1673 | /* | |
1674 | * Remove from the mapping tree, taking care to inc the | |
1675 | * ref count so it doesn't get deleted. | |
1676 | */ | |
1677 | mapping_root = le64_to_cpu(value); | |
1678 | dm_tm_inc(pmd->tm, mapping_root); | |
1679 | r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root); | |
1680 | if (r) | |
1681 | return r; | |
1682 | ||
993ceab9 JT |
1683 | /* |
1684 | * Remove leaves stops at the first unmapped entry, so we have to | |
1685 | * loop round finding mapped ranges. | |
1686 | */ | |
1687 | while (begin < end) { | |
1688 | r = dm_btree_lookup_next(&pmd->bl_info, mapping_root, &begin, &begin, &value); | |
1689 | if (r == -ENODATA) | |
1690 | break; | |
1691 | ||
1692 | if (r) | |
1693 | return r; | |
1694 | ||
1695 | if (begin >= end) | |
1696 | break; | |
1697 | ||
1698 | r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count); | |
1699 | if (r) | |
1700 | return r; | |
1701 | ||
1702 | total_count += count; | |
1703 | } | |
6550f075 | 1704 | |
993ceab9 | 1705 | td->mapped_blocks -= total_count; |
63ee92d1 | 1706 | td->changed = true; |
6550f075 JT |
1707 | |
1708 | /* | |
1709 | * Reinsert the mapping tree. | |
1710 | */ | |
1711 | value = cpu_to_le64(mapping_root); | |
1712 | __dm_bless_for_disk(&value); | |
1713 | return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root); | |
1714 | } | |
1715 | ||
991d9fa0 JT |
1716 | int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) |
1717 | { | |
da105ed5 | 1718 | int r = -EINVAL; |
991d9fa0 | 1719 | |
6a1b1ddc | 1720 | pmd_write_lock(td->pmd); |
da105ed5 JT |
1721 | if (!td->pmd->fail_io) |
1722 | r = __remove(td, block); | |
6a1b1ddc | 1723 | pmd_write_unlock(td->pmd); |
19fa1a67 JT |
1724 | |
1725 | return r; | |
1726 | } | |
1727 | ||
6550f075 JT |
1728 | int dm_thin_remove_range(struct dm_thin_device *td, |
1729 | dm_block_t begin, dm_block_t end) | |
1730 | { | |
1731 | int r = -EINVAL; | |
1732 | ||
6a1b1ddc | 1733 | pmd_write_lock(td->pmd); |
6550f075 JT |
1734 | if (!td->pmd->fail_io) |
1735 | r = __remove_range(td, begin, end); | |
6a1b1ddc | 1736 | pmd_write_unlock(td->pmd); |
6550f075 JT |
1737 | |
1738 | return r; | |
1739 | } | |
1740 | ||
d445bd9c | 1741 | int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) |
19fa1a67 JT |
1742 | { |
1743 | int r; | |
1744 | uint32_t ref_count; | |
1745 | ||
1746 | down_read(&pmd->root_lock); | |
1747 | r = dm_sm_get_count(pmd->data_sm, b, &ref_count); | |
1748 | if (!r) | |
d445bd9c | 1749 | *result = (ref_count > 1); |
19fa1a67 | 1750 | up_read(&pmd->root_lock); |
991d9fa0 JT |
1751 | |
1752 | return r; | |
1753 | } | |
1754 | ||
2a0fbffb JT |
1755 | int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) |
1756 | { | |
1757 | int r = 0; | |
1758 | ||
6a1b1ddc | 1759 | pmd_write_lock(pmd); |
2a0fbffb JT |
1760 | for (; b != e; b++) { |
1761 | r = dm_sm_inc_block(pmd->data_sm, b); | |
1762 | if (r) | |
1763 | break; | |
1764 | } | |
6a1b1ddc | 1765 | pmd_write_unlock(pmd); |
2a0fbffb JT |
1766 | |
1767 | return r; | |
1768 | } | |
1769 | ||
1770 | int dm_pool_dec_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) | |
1771 | { | |
1772 | int r = 0; | |
1773 | ||
6a1b1ddc | 1774 | pmd_write_lock(pmd); |
2a0fbffb JT |
1775 | for (; b != e; b++) { |
1776 | r = dm_sm_dec_block(pmd->data_sm, b); | |
1777 | if (r) | |
1778 | break; | |
1779 | } | |
6a1b1ddc | 1780 | pmd_write_unlock(pmd); |
2a0fbffb JT |
1781 | |
1782 | return r; | |
1783 | } | |
1784 | ||
40db5a53 JT |
1785 | bool dm_thin_changed_this_transaction(struct dm_thin_device *td) |
1786 | { | |
1787 | int r; | |
1788 | ||
1789 | down_read(&td->pmd->root_lock); | |
1790 | r = td->changed; | |
1791 | up_read(&td->pmd->root_lock); | |
1792 | ||
1793 | return r; | |
1794 | } | |
1795 | ||
4d1662a3 MS |
1796 | bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd) |
1797 | { | |
1798 | bool r = false; | |
1799 | struct dm_thin_device *td, *tmp; | |
1800 | ||
1801 | down_read(&pmd->root_lock); | |
1802 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
1803 | if (td->changed) { | |
1804 | r = td->changed; | |
1805 | break; | |
1806 | } | |
1807 | } | |
1808 | up_read(&pmd->root_lock); | |
1809 | ||
1810 | return r; | |
1811 | } | |
1812 | ||
da105ed5 JT |
1813 | bool dm_thin_aborted_changes(struct dm_thin_device *td) |
1814 | { | |
1815 | bool r; | |
1816 | ||
1817 | down_read(&td->pmd->root_lock); | |
1818 | r = td->aborted_with_changes; | |
1819 | up_read(&td->pmd->root_lock); | |
1820 | ||
1821 | return r; | |
1822 | } | |
1823 | ||
991d9fa0 JT |
1824 | int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result) |
1825 | { | |
da105ed5 | 1826 | int r = -EINVAL; |
991d9fa0 | 1827 | |
6a1b1ddc | 1828 | pmd_write_lock(pmd); |
da105ed5 JT |
1829 | if (!pmd->fail_io) |
1830 | r = dm_sm_new_block(pmd->data_sm, result); | |
6a1b1ddc | 1831 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1832 | |
1833 | return r; | |
1834 | } | |
1835 | ||
1836 | int dm_pool_commit_metadata(struct dm_pool_metadata *pmd) | |
1837 | { | |
da105ed5 | 1838 | int r = -EINVAL; |
991d9fa0 | 1839 | |
873f258b MS |
1840 | /* |
1841 | * Care is taken to not have commit be what | |
1842 | * triggers putting the thin-pool in-service. | |
1843 | */ | |
1844 | __pmd_write_lock(pmd); | |
da105ed5 JT |
1845 | if (pmd->fail_io) |
1846 | goto out; | |
991d9fa0 JT |
1847 | |
1848 | r = __commit_transaction(pmd); | |
873f258b | 1849 | if (r < 0) |
991d9fa0 JT |
1850 | goto out; |
1851 | ||
1852 | /* | |
1853 | * Open the next transaction. | |
1854 | */ | |
1855 | r = __begin_transaction(pmd); | |
1856 | out: | |
6a1b1ddc | 1857 | pmd_write_unlock(pmd); |
991d9fa0 JT |
1858 | return r; |
1859 | } | |
1860 | ||
da105ed5 JT |
1861 | static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd) |
1862 | { | |
1863 | struct dm_thin_device *td; | |
1864 | ||
1865 | list_for_each_entry(td, &pmd->thin_devices, list) | |
1866 | td->aborted_with_changes = td->changed; | |
1867 | } | |
1868 | ||
1869 | int dm_pool_abort_metadata(struct dm_pool_metadata *pmd) | |
1870 | { | |
1871 | int r = -EINVAL; | |
1872 | ||
6a1b1ddc | 1873 | pmd_write_lock(pmd); |
da105ed5 JT |
1874 | if (pmd->fail_io) |
1875 | goto out; | |
1876 | ||
1877 | __set_abort_with_changes_flags(pmd); | |
1878 | __destroy_persistent_data_objects(pmd); | |
1879 | r = __create_persistent_data_objects(pmd, false); | |
1880 | if (r) | |
1881 | pmd->fail_io = true; | |
1882 | ||
1883 | out: | |
6a1b1ddc | 1884 | pmd_write_unlock(pmd); |
da105ed5 JT |
1885 | |
1886 | return r; | |
1887 | } | |
1888 | ||
991d9fa0 JT |
1889 | int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result) |
1890 | { | |
da105ed5 | 1891 | int r = -EINVAL; |
991d9fa0 JT |
1892 | |
1893 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1894 | if (!pmd->fail_io) |
1895 | r = dm_sm_get_nr_free(pmd->data_sm, result); | |
991d9fa0 JT |
1896 | up_read(&pmd->root_lock); |
1897 | ||
1898 | return r; | |
1899 | } | |
1900 | ||
1901 | int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, | |
1902 | dm_block_t *result) | |
1903 | { | |
da105ed5 | 1904 | int r = -EINVAL; |
991d9fa0 JT |
1905 | |
1906 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1907 | if (!pmd->fail_io) |
1908 | r = dm_sm_get_nr_free(pmd->metadata_sm, result); | |
3ab91828 JT |
1909 | |
1910 | if (!r) { | |
1911 | if (*result < pmd->metadata_reserve) | |
1912 | *result = 0; | |
1913 | else | |
1914 | *result -= pmd->metadata_reserve; | |
1915 | } | |
991d9fa0 JT |
1916 | up_read(&pmd->root_lock); |
1917 | ||
1918 | return r; | |
1919 | } | |
1920 | ||
1921 | int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, | |
1922 | dm_block_t *result) | |
1923 | { | |
da105ed5 | 1924 | int r = -EINVAL; |
991d9fa0 JT |
1925 | |
1926 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1927 | if (!pmd->fail_io) |
1928 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, result); | |
991d9fa0 JT |
1929 | up_read(&pmd->root_lock); |
1930 | ||
1931 | return r; | |
1932 | } | |
1933 | ||
991d9fa0 JT |
1934 | int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result) |
1935 | { | |
da105ed5 | 1936 | int r = -EINVAL; |
991d9fa0 JT |
1937 | |
1938 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1939 | if (!pmd->fail_io) |
1940 | r = dm_sm_get_nr_blocks(pmd->data_sm, result); | |
991d9fa0 JT |
1941 | up_read(&pmd->root_lock); |
1942 | ||
1943 | return r; | |
1944 | } | |
1945 | ||
1946 | int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result) | |
1947 | { | |
da105ed5 | 1948 | int r = -EINVAL; |
991d9fa0 JT |
1949 | struct dm_pool_metadata *pmd = td->pmd; |
1950 | ||
1951 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1952 | if (!pmd->fail_io) { |
1953 | *result = td->mapped_blocks; | |
1954 | r = 0; | |
1955 | } | |
991d9fa0 JT |
1956 | up_read(&pmd->root_lock); |
1957 | ||
da105ed5 | 1958 | return r; |
991d9fa0 JT |
1959 | } |
1960 | ||
1961 | static int __highest_block(struct dm_thin_device *td, dm_block_t *result) | |
1962 | { | |
1963 | int r; | |
1964 | __le64 value_le; | |
1965 | dm_block_t thin_root; | |
1966 | struct dm_pool_metadata *pmd = td->pmd; | |
1967 | ||
1968 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le); | |
1969 | if (r) | |
1970 | return r; | |
1971 | ||
1972 | thin_root = le64_to_cpu(value_le); | |
1973 | ||
1974 | return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result); | |
1975 | } | |
1976 | ||
1977 | int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, | |
1978 | dm_block_t *result) | |
1979 | { | |
da105ed5 | 1980 | int r = -EINVAL; |
991d9fa0 JT |
1981 | struct dm_pool_metadata *pmd = td->pmd; |
1982 | ||
1983 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1984 | if (!pmd->fail_io) |
1985 | r = __highest_block(td, result); | |
991d9fa0 JT |
1986 | up_read(&pmd->root_lock); |
1987 | ||
1988 | return r; | |
1989 | } | |
1990 | ||
b17446df | 1991 | static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count) |
991d9fa0 JT |
1992 | { |
1993 | int r; | |
1994 | dm_block_t old_count; | |
1995 | ||
b17446df | 1996 | r = dm_sm_get_nr_blocks(sm, &old_count); |
991d9fa0 JT |
1997 | if (r) |
1998 | return r; | |
1999 | ||
2000 | if (new_count == old_count) | |
2001 | return 0; | |
2002 | ||
2003 | if (new_count < old_count) { | |
b17446df | 2004 | DMERR("cannot reduce size of space map"); |
991d9fa0 JT |
2005 | return -EINVAL; |
2006 | } | |
2007 | ||
b17446df | 2008 | return dm_sm_extend(sm, new_count - old_count); |
991d9fa0 JT |
2009 | } |
2010 | ||
2011 | int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) | |
2012 | { | |
da105ed5 | 2013 | int r = -EINVAL; |
991d9fa0 | 2014 | |
6a1b1ddc | 2015 | pmd_write_lock(pmd); |
da105ed5 | 2016 | if (!pmd->fail_io) |
b17446df | 2017 | r = __resize_space_map(pmd->data_sm, new_count); |
6a1b1ddc | 2018 | pmd_write_unlock(pmd); |
991d9fa0 JT |
2019 | |
2020 | return r; | |
2021 | } | |
12ba58af | 2022 | |
24347e95 JT |
2023 | int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) |
2024 | { | |
2025 | int r = -EINVAL; | |
2026 | ||
6a1b1ddc | 2027 | pmd_write_lock(pmd); |
3ab91828 | 2028 | if (!pmd->fail_io) { |
24347e95 | 2029 | r = __resize_space_map(pmd->metadata_sm, new_count); |
3ab91828 JT |
2030 | if (!r) |
2031 | __set_metadata_reserve(pmd); | |
2032 | } | |
6a1b1ddc | 2033 | pmd_write_unlock(pmd); |
24347e95 JT |
2034 | |
2035 | return r; | |
2036 | } | |
2037 | ||
12ba58af JT |
2038 | void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) |
2039 | { | |
6a1b1ddc | 2040 | pmd_write_lock_in_core(pmd); |
12ba58af | 2041 | dm_bm_set_read_only(pmd->bm); |
6a1b1ddc | 2042 | pmd_write_unlock(pmd); |
12ba58af | 2043 | } |
ac8c3f3d | 2044 | |
9b7aaa64 JT |
2045 | void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd) |
2046 | { | |
6a1b1ddc | 2047 | pmd_write_lock_in_core(pmd); |
9b7aaa64 | 2048 | dm_bm_set_read_write(pmd->bm); |
6a1b1ddc | 2049 | pmd_write_unlock(pmd); |
9b7aaa64 JT |
2050 | } |
2051 | ||
ac8c3f3d JT |
2052 | int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, |
2053 | dm_block_t threshold, | |
2054 | dm_sm_threshold_fn fn, | |
2055 | void *context) | |
2056 | { | |
2057 | int r; | |
2058 | ||
6a1b1ddc | 2059 | pmd_write_lock_in_core(pmd); |
ac8c3f3d | 2060 | r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context); |
6a1b1ddc | 2061 | pmd_write_unlock(pmd); |
ac8c3f3d JT |
2062 | |
2063 | return r; | |
2064 | } | |
07f2b6e0 | 2065 | |
ecda7c02 NT |
2066 | void dm_pool_register_pre_commit_callback(struct dm_pool_metadata *pmd, |
2067 | dm_pool_pre_commit_fn fn, | |
2068 | void *context) | |
2069 | { | |
2070 | pmd_write_lock_in_core(pmd); | |
2071 | pmd->pre_commit_fn = fn; | |
2072 | pmd->pre_commit_context = context; | |
2073 | pmd_write_unlock(pmd); | |
2074 | } | |
2075 | ||
07f2b6e0 MS |
2076 | int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd) |
2077 | { | |
54fa16ee | 2078 | int r = -EINVAL; |
07f2b6e0 MS |
2079 | struct dm_block *sblock; |
2080 | struct thin_disk_superblock *disk_super; | |
2081 | ||
6a1b1ddc | 2082 | pmd_write_lock(pmd); |
54fa16ee MS |
2083 | if (pmd->fail_io) |
2084 | goto out; | |
2085 | ||
07f2b6e0 MS |
2086 | pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG; |
2087 | ||
2088 | r = superblock_lock(pmd, &sblock); | |
2089 | if (r) { | |
54fa16ee | 2090 | DMERR("couldn't lock superblock"); |
07f2b6e0 MS |
2091 | goto out; |
2092 | } | |
2093 | ||
2094 | disk_super = dm_block_data(sblock); | |
2095 | disk_super->flags = cpu_to_le32(pmd->flags); | |
2096 | ||
2097 | dm_bm_unlock(sblock); | |
2098 | out: | |
6a1b1ddc | 2099 | pmd_write_unlock(pmd); |
07f2b6e0 MS |
2100 | return r; |
2101 | } | |
2102 | ||
2103 | bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd) | |
2104 | { | |
2105 | bool needs_check; | |
2106 | ||
2107 | down_read(&pmd->root_lock); | |
2108 | needs_check = pmd->flags & THIN_METADATA_NEEDS_CHECK_FLAG; | |
2109 | up_read(&pmd->root_lock); | |
2110 | ||
2111 | return needs_check; | |
2112 | } | |
8a01a6af JT |
2113 | |
2114 | void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd) | |
2115 | { | |
2eae9e44 JT |
2116 | down_read(&pmd->root_lock); |
2117 | if (!pmd->fail_io) | |
2118 | dm_tm_issue_prefetches(pmd->tm); | |
2119 | up_read(&pmd->root_lock); | |
8a01a6af | 2120 | } |