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 | |
31 | * field holding the time in the low 24 bits, and block in the top 48 | |
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 | |
3ab91828 JT |
191 | /* |
192 | * We reserve a section of the metadata for commit overhead. | |
193 | * All reported space does *not* include this. | |
194 | */ | |
195 | dm_block_t metadata_reserve; | |
196 | ||
da105ed5 JT |
197 | /* |
198 | * Set if a transaction has to be aborted but the attempt to roll back | |
199 | * to the previous (good) transaction failed. The only pool metadata | |
200 | * operation possible in this state is the closing of the device. | |
201 | */ | |
202 | bool fail_io:1; | |
5a32083d JT |
203 | |
204 | /* | |
205 | * Reading the space map roots can fail, so we read it into these | |
206 | * buffers before the superblock is locked and updated. | |
207 | */ | |
208 | __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
209 | __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
991d9fa0 JT |
210 | }; |
211 | ||
212 | struct dm_thin_device { | |
213 | struct list_head list; | |
214 | struct dm_pool_metadata *pmd; | |
215 | dm_thin_id id; | |
216 | ||
217 | int open_count; | |
da105ed5 JT |
218 | bool changed:1; |
219 | bool aborted_with_changes:1; | |
991d9fa0 JT |
220 | uint64_t mapped_blocks; |
221 | uint64_t transaction_id; | |
222 | uint32_t creation_time; | |
223 | uint32_t snapshotted_time; | |
224 | }; | |
225 | ||
226 | /*---------------------------------------------------------------- | |
227 | * superblock validator | |
228 | *--------------------------------------------------------------*/ | |
229 | ||
230 | #define SUPERBLOCK_CSUM_XOR 160774 | |
231 | ||
232 | static void sb_prepare_for_write(struct dm_block_validator *v, | |
233 | struct dm_block *b, | |
234 | size_t block_size) | |
235 | { | |
236 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
237 | ||
238 | disk_super->blocknr = cpu_to_le64(dm_block_location(b)); | |
239 | disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
240 | block_size - sizeof(__le32), | |
241 | SUPERBLOCK_CSUM_XOR)); | |
242 | } | |
243 | ||
244 | static int sb_check(struct dm_block_validator *v, | |
245 | struct dm_block *b, | |
246 | size_t block_size) | |
247 | { | |
248 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
249 | __le32 csum_le; | |
250 | ||
251 | if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) { | |
252 | DMERR("sb_check failed: blocknr %llu: " | |
253 | "wanted %llu", le64_to_cpu(disk_super->blocknr), | |
254 | (unsigned long long)dm_block_location(b)); | |
255 | return -ENOTBLK; | |
256 | } | |
257 | ||
258 | if (le64_to_cpu(disk_super->magic) != THIN_SUPERBLOCK_MAGIC) { | |
259 | DMERR("sb_check failed: magic %llu: " | |
260 | "wanted %llu", le64_to_cpu(disk_super->magic), | |
261 | (unsigned long long)THIN_SUPERBLOCK_MAGIC); | |
262 | return -EILSEQ; | |
263 | } | |
264 | ||
265 | csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
266 | block_size - sizeof(__le32), | |
267 | SUPERBLOCK_CSUM_XOR)); | |
268 | if (csum_le != disk_super->csum) { | |
269 | DMERR("sb_check failed: csum %u: wanted %u", | |
270 | le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum)); | |
271 | return -EILSEQ; | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static struct dm_block_validator sb_validator = { | |
278 | .name = "superblock", | |
279 | .prepare_for_write = sb_prepare_for_write, | |
280 | .check = sb_check | |
281 | }; | |
282 | ||
283 | /*---------------------------------------------------------------- | |
284 | * Methods for the btree value types | |
285 | *--------------------------------------------------------------*/ | |
286 | ||
287 | static uint64_t pack_block_time(dm_block_t b, uint32_t t) | |
288 | { | |
289 | return (b << 24) | t; | |
290 | } | |
291 | ||
292 | static void unpack_block_time(uint64_t v, dm_block_t *b, uint32_t *t) | |
293 | { | |
294 | *b = v >> 24; | |
295 | *t = v & ((1 << 24) - 1); | |
296 | } | |
297 | ||
018cede9 | 298 | static void data_block_inc(void *context, const void *value_le) |
991d9fa0 JT |
299 | { |
300 | struct dm_space_map *sm = context; | |
301 | __le64 v_le; | |
302 | uint64_t b; | |
303 | uint32_t t; | |
304 | ||
305 | memcpy(&v_le, value_le, sizeof(v_le)); | |
306 | unpack_block_time(le64_to_cpu(v_le), &b, &t); | |
307 | dm_sm_inc_block(sm, b); | |
308 | } | |
309 | ||
018cede9 | 310 | static void data_block_dec(void *context, const void *value_le) |
991d9fa0 JT |
311 | { |
312 | struct dm_space_map *sm = context; | |
313 | __le64 v_le; | |
314 | uint64_t b; | |
315 | uint32_t t; | |
316 | ||
317 | memcpy(&v_le, value_le, sizeof(v_le)); | |
318 | unpack_block_time(le64_to_cpu(v_le), &b, &t); | |
319 | dm_sm_dec_block(sm, b); | |
320 | } | |
321 | ||
018cede9 | 322 | static int data_block_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
323 | { |
324 | __le64 v1_le, v2_le; | |
325 | uint64_t b1, b2; | |
326 | uint32_t t; | |
327 | ||
328 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
329 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
330 | unpack_block_time(le64_to_cpu(v1_le), &b1, &t); | |
331 | unpack_block_time(le64_to_cpu(v2_le), &b2, &t); | |
332 | ||
333 | return b1 == b2; | |
334 | } | |
335 | ||
018cede9 | 336 | static void subtree_inc(void *context, const void *value) |
991d9fa0 JT |
337 | { |
338 | struct dm_btree_info *info = context; | |
339 | __le64 root_le; | |
340 | uint64_t root; | |
341 | ||
342 | memcpy(&root_le, value, sizeof(root_le)); | |
343 | root = le64_to_cpu(root_le); | |
344 | dm_tm_inc(info->tm, root); | |
345 | } | |
346 | ||
018cede9 | 347 | static void subtree_dec(void *context, const void *value) |
991d9fa0 JT |
348 | { |
349 | struct dm_btree_info *info = context; | |
350 | __le64 root_le; | |
351 | uint64_t root; | |
352 | ||
353 | memcpy(&root_le, value, sizeof(root_le)); | |
354 | root = le64_to_cpu(root_le); | |
355 | if (dm_btree_del(info, root)) | |
29f929b5 | 356 | DMERR("btree delete failed"); |
991d9fa0 JT |
357 | } |
358 | ||
018cede9 | 359 | static int subtree_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
360 | { |
361 | __le64 v1_le, v2_le; | |
362 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
363 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
364 | ||
365 | return v1_le == v2_le; | |
366 | } | |
367 | ||
368 | /*----------------------------------------------------------------*/ | |
369 | ||
25971192 JT |
370 | static int superblock_lock_zero(struct dm_pool_metadata *pmd, |
371 | struct dm_block **sblock) | |
372 | { | |
373 | return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
374 | &sb_validator, sblock); | |
375 | } | |
376 | ||
377 | static int superblock_lock(struct dm_pool_metadata *pmd, | |
378 | struct dm_block **sblock) | |
379 | { | |
380 | return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
381 | &sb_validator, sblock); | |
382 | } | |
383 | ||
332627db | 384 | static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result) |
991d9fa0 JT |
385 | { |
386 | int r; | |
387 | unsigned i; | |
388 | struct dm_block *b; | |
389 | __le64 *data_le, zero = cpu_to_le64(0); | |
390 | unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64); | |
391 | ||
392 | /* | |
393 | * We can't use a validator here - it may be all zeroes. | |
394 | */ | |
395 | r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b); | |
396 | if (r) | |
397 | return r; | |
398 | ||
399 | data_le = dm_block_data(b); | |
400 | *result = 1; | |
401 | for (i = 0; i < block_size; i++) { | |
402 | if (data_le[i] != zero) { | |
403 | *result = 0; | |
404 | break; | |
405 | } | |
406 | } | |
407 | ||
4c7da06f MP |
408 | dm_bm_unlock(b); |
409 | ||
410 | return 0; | |
991d9fa0 JT |
411 | } |
412 | ||
41675aea JT |
413 | static void __setup_btree_details(struct dm_pool_metadata *pmd) |
414 | { | |
415 | pmd->info.tm = pmd->tm; | |
416 | pmd->info.levels = 2; | |
417 | pmd->info.value_type.context = pmd->data_sm; | |
418 | pmd->info.value_type.size = sizeof(__le64); | |
419 | pmd->info.value_type.inc = data_block_inc; | |
420 | pmd->info.value_type.dec = data_block_dec; | |
421 | pmd->info.value_type.equal = data_block_equal; | |
422 | ||
423 | memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info)); | |
424 | pmd->nb_info.tm = pmd->nb_tm; | |
425 | ||
426 | pmd->tl_info.tm = pmd->tm; | |
427 | pmd->tl_info.levels = 1; | |
e3cbf945 | 428 | pmd->tl_info.value_type.context = &pmd->bl_info; |
41675aea JT |
429 | pmd->tl_info.value_type.size = sizeof(__le64); |
430 | pmd->tl_info.value_type.inc = subtree_inc; | |
431 | pmd->tl_info.value_type.dec = subtree_dec; | |
432 | pmd->tl_info.value_type.equal = subtree_equal; | |
433 | ||
434 | pmd->bl_info.tm = pmd->tm; | |
435 | pmd->bl_info.levels = 1; | |
436 | pmd->bl_info.value_type.context = pmd->data_sm; | |
437 | pmd->bl_info.value_type.size = sizeof(__le64); | |
438 | pmd->bl_info.value_type.inc = data_block_inc; | |
439 | pmd->bl_info.value_type.dec = data_block_dec; | |
440 | pmd->bl_info.value_type.equal = data_block_equal; | |
441 | ||
442 | pmd->details_info.tm = pmd->tm; | |
443 | pmd->details_info.levels = 1; | |
444 | pmd->details_info.value_type.context = NULL; | |
445 | pmd->details_info.value_type.size = sizeof(struct disk_device_details); | |
446 | pmd->details_info.value_type.inc = NULL; | |
447 | pmd->details_info.value_type.dec = NULL; | |
448 | pmd->details_info.value_type.equal = NULL; | |
449 | } | |
450 | ||
5a32083d JT |
451 | static int save_sm_roots(struct dm_pool_metadata *pmd) |
452 | { | |
453 | int r; | |
454 | size_t len; | |
455 | ||
456 | r = dm_sm_root_size(pmd->metadata_sm, &len); | |
457 | if (r < 0) | |
458 | return r; | |
459 | ||
460 | r = dm_sm_copy_root(pmd->metadata_sm, &pmd->metadata_space_map_root, len); | |
461 | if (r < 0) | |
462 | return r; | |
463 | ||
464 | r = dm_sm_root_size(pmd->data_sm, &len); | |
465 | if (r < 0) | |
466 | return r; | |
467 | ||
468 | return dm_sm_copy_root(pmd->data_sm, &pmd->data_space_map_root, len); | |
469 | } | |
470 | ||
471 | static void copy_sm_roots(struct dm_pool_metadata *pmd, | |
472 | struct thin_disk_superblock *disk) | |
473 | { | |
474 | memcpy(&disk->metadata_space_map_root, | |
475 | &pmd->metadata_space_map_root, | |
476 | sizeof(pmd->metadata_space_map_root)); | |
477 | ||
478 | memcpy(&disk->data_space_map_root, | |
479 | &pmd->data_space_map_root, | |
480 | sizeof(pmd->data_space_map_root)); | |
481 | } | |
482 | ||
9cb6653f JT |
483 | static int __write_initial_superblock(struct dm_pool_metadata *pmd) |
484 | { | |
485 | int r; | |
486 | struct dm_block *sblock; | |
487 | struct thin_disk_superblock *disk_super; | |
488 | sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT; | |
489 | ||
490 | if (bdev_size > THIN_METADATA_MAX_SECTORS) | |
491 | bdev_size = THIN_METADATA_MAX_SECTORS; | |
492 | ||
5a32083d | 493 | r = dm_sm_commit(pmd->data_sm); |
10d2a9ff JT |
494 | if (r < 0) |
495 | return r; | |
496 | ||
91bcdb92 | 497 | r = dm_tm_pre_commit(pmd->tm); |
10d2a9ff JT |
498 | if (r < 0) |
499 | return r; | |
500 | ||
91bcdb92 | 501 | r = save_sm_roots(pmd); |
10d2a9ff JT |
502 | if (r < 0) |
503 | return r; | |
504 | ||
9cb6653f JT |
505 | r = superblock_lock_zero(pmd, &sblock); |
506 | if (r) | |
507 | return r; | |
508 | ||
509 | disk_super = dm_block_data(sblock); | |
10d2a9ff | 510 | disk_super->flags = 0; |
583ceee2 | 511 | memset(disk_super->uuid, 0, sizeof(disk_super->uuid)); |
9cb6653f JT |
512 | disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC); |
513 | disk_super->version = cpu_to_le32(THIN_VERSION); | |
514 | disk_super->time = 0; | |
10d2a9ff JT |
515 | disk_super->trans_id = 0; |
516 | disk_super->held_root = 0; | |
517 | ||
5a32083d | 518 | copy_sm_roots(pmd, disk_super); |
10d2a9ff JT |
519 | |
520 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
521 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
7d48935e | 522 | disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE); |
9cb6653f JT |
523 | disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT); |
524 | disk_super->data_block_size = cpu_to_le32(pmd->data_block_size); | |
525 | ||
270938ba | 526 | return dm_tm_commit(pmd->tm, sblock); |
9cb6653f JT |
527 | } |
528 | ||
a97e5e6f | 529 | static int __format_metadata(struct dm_pool_metadata *pmd) |
991d9fa0 JT |
530 | { |
531 | int r; | |
384ef0e6 | 532 | |
e4d2205c JT |
533 | r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
534 | &pmd->tm, &pmd->metadata_sm); | |
535 | if (r < 0) { | |
536 | DMERR("tm_create_with_sm failed"); | |
537 | return r; | |
538 | } | |
991d9fa0 | 539 | |
a97e5e6f | 540 | pmd->data_sm = dm_sm_disk_create(pmd->tm, 0); |
e4d2205c JT |
541 | if (IS_ERR(pmd->data_sm)) { |
542 | DMERR("sm_disk_create failed"); | |
543 | r = PTR_ERR(pmd->data_sm); | |
0fa5b17b | 544 | goto bad_cleanup_tm; |
991d9fa0 JT |
545 | } |
546 | ||
d6332814 | 547 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
991d9fa0 | 548 | if (!pmd->nb_tm) { |
0fa5b17b | 549 | DMERR("could not create non-blocking clone tm"); |
991d9fa0 | 550 | r = -ENOMEM; |
0fa5b17b | 551 | goto bad_cleanup_data_sm; |
991d9fa0 JT |
552 | } |
553 | ||
41675aea | 554 | __setup_btree_details(pmd); |
991d9fa0 | 555 | |
9cb6653f JT |
556 | r = dm_btree_empty(&pmd->info, &pmd->root); |
557 | if (r < 0) | |
0fa5b17b | 558 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
559 | |
560 | r = dm_btree_empty(&pmd->details_info, &pmd->details_root); | |
561 | if (r < 0) { | |
562 | DMERR("couldn't create devices root"); | |
0fa5b17b | 563 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
564 | } |
565 | ||
566 | r = __write_initial_superblock(pmd); | |
567 | if (r) | |
0fa5b17b | 568 | goto bad_cleanup_nb_tm; |
9cb6653f | 569 | |
991d9fa0 JT |
570 | return 0; |
571 | ||
0fa5b17b JT |
572 | bad_cleanup_nb_tm: |
573 | dm_tm_destroy(pmd->nb_tm); | |
574 | bad_cleanup_data_sm: | |
d6332814 | 575 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 576 | bad_cleanup_tm: |
d6332814 JT |
577 | dm_tm_destroy(pmd->tm); |
578 | dm_sm_destroy(pmd->metadata_sm); | |
991d9fa0 JT |
579 | |
580 | return r; | |
581 | } | |
582 | ||
d73ec525 MS |
583 | static int __check_incompat_features(struct thin_disk_superblock *disk_super, |
584 | struct dm_pool_metadata *pmd) | |
585 | { | |
586 | uint32_t features; | |
587 | ||
588 | features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP; | |
589 | if (features) { | |
590 | DMERR("could not access metadata due to unsupported optional features (%lx).", | |
591 | (unsigned long)features); | |
592 | return -EINVAL; | |
593 | } | |
594 | ||
595 | /* | |
596 | * Check for read-only metadata to skip the following RDWR checks. | |
597 | */ | |
598 | if (get_disk_ro(pmd->bdev->bd_disk)) | |
599 | return 0; | |
600 | ||
601 | features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP; | |
602 | if (features) { | |
603 | DMERR("could not access metadata RDWR due to unsupported optional features (%lx).", | |
604 | (unsigned long)features); | |
605 | return -EINVAL; | |
606 | } | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
e4d2205c JT |
611 | static int __open_metadata(struct dm_pool_metadata *pmd) |
612 | { | |
613 | int r; | |
614 | struct dm_block *sblock; | |
615 | struct thin_disk_superblock *disk_super; | |
616 | ||
617 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
618 | &sb_validator, &sblock); | |
619 | if (r < 0) { | |
620 | DMERR("couldn't read superblock"); | |
621 | return r; | |
622 | } | |
623 | ||
624 | disk_super = dm_block_data(sblock); | |
d73ec525 | 625 | |
9aec8629 MS |
626 | /* Verify the data block size hasn't changed */ |
627 | if (le32_to_cpu(disk_super->data_block_size) != pmd->data_block_size) { | |
628 | DMERR("changing the data block size (from %u to %llu) is not supported", | |
629 | le32_to_cpu(disk_super->data_block_size), | |
630 | (unsigned long long)pmd->data_block_size); | |
631 | r = -EINVAL; | |
632 | goto bad_unlock_sblock; | |
633 | } | |
634 | ||
d73ec525 | 635 | r = __check_incompat_features(disk_super, pmd); |
0fa5b17b JT |
636 | if (r < 0) |
637 | goto bad_unlock_sblock; | |
d73ec525 | 638 | |
e4d2205c JT |
639 | r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
640 | disk_super->metadata_space_map_root, | |
641 | sizeof(disk_super->metadata_space_map_root), | |
642 | &pmd->tm, &pmd->metadata_sm); | |
643 | if (r < 0) { | |
644 | DMERR("tm_open_with_sm failed"); | |
0fa5b17b | 645 | goto bad_unlock_sblock; |
e4d2205c JT |
646 | } |
647 | ||
648 | pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root, | |
649 | sizeof(disk_super->data_space_map_root)); | |
650 | if (IS_ERR(pmd->data_sm)) { | |
651 | DMERR("sm_disk_open failed"); | |
e4d2205c | 652 | r = PTR_ERR(pmd->data_sm); |
0fa5b17b | 653 | goto bad_cleanup_tm; |
e4d2205c JT |
654 | } |
655 | ||
e4d2205c JT |
656 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
657 | if (!pmd->nb_tm) { | |
0fa5b17b | 658 | DMERR("could not create non-blocking clone tm"); |
e4d2205c | 659 | r = -ENOMEM; |
0fa5b17b | 660 | goto bad_cleanup_data_sm; |
e4d2205c JT |
661 | } |
662 | ||
663 | __setup_btree_details(pmd); | |
4c7da06f MP |
664 | dm_bm_unlock(sblock); |
665 | ||
666 | return 0; | |
e4d2205c | 667 | |
0fa5b17b | 668 | bad_cleanup_data_sm: |
e4d2205c | 669 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 670 | bad_cleanup_tm: |
e4d2205c JT |
671 | dm_tm_destroy(pmd->tm); |
672 | dm_sm_destroy(pmd->metadata_sm); | |
0fa5b17b JT |
673 | bad_unlock_sblock: |
674 | dm_bm_unlock(sblock); | |
e4d2205c JT |
675 | |
676 | return r; | |
677 | } | |
678 | ||
66b1edc0 | 679 | static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device) |
e4d2205c | 680 | { |
8801e069 | 681 | int r, unformatted; |
237074c0 | 682 | |
8801e069 | 683 | r = __superblock_all_zeroes(pmd->bm, &unformatted); |
237074c0 JT |
684 | if (r) |
685 | return r; | |
686 | ||
8801e069 | 687 | if (unformatted) |
66b1edc0 JT |
688 | return format_device ? __format_metadata(pmd) : -EPERM; |
689 | ||
690 | return __open_metadata(pmd); | |
e4d2205c JT |
691 | } |
692 | ||
66b1edc0 | 693 | static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device) |
332627db JT |
694 | { |
695 | int r; | |
696 | ||
7d48935e | 697 | pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT, |
332627db JT |
698 | THIN_MAX_CONCURRENT_LOCKS); |
699 | if (IS_ERR(pmd->bm)) { | |
700 | DMERR("could not create block manager"); | |
701 | return PTR_ERR(pmd->bm); | |
702 | } | |
703 | ||
66b1edc0 | 704 | r = __open_or_format_metadata(pmd, format_device); |
332627db JT |
705 | if (r) |
706 | dm_block_manager_destroy(pmd->bm); | |
707 | ||
708 | return r; | |
709 | } | |
710 | ||
f9dd9352 JT |
711 | static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd) |
712 | { | |
713 | dm_sm_destroy(pmd->data_sm); | |
714 | dm_sm_destroy(pmd->metadata_sm); | |
715 | dm_tm_destroy(pmd->nb_tm); | |
716 | dm_tm_destroy(pmd->tm); | |
717 | dm_block_manager_destroy(pmd->bm); | |
718 | } | |
719 | ||
991d9fa0 JT |
720 | static int __begin_transaction(struct dm_pool_metadata *pmd) |
721 | { | |
722 | int r; | |
991d9fa0 JT |
723 | struct thin_disk_superblock *disk_super; |
724 | struct dm_block *sblock; | |
725 | ||
991d9fa0 JT |
726 | /* |
727 | * We re-read the superblock every time. Shouldn't need to do this | |
728 | * really. | |
729 | */ | |
730 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
731 | &sb_validator, &sblock); | |
732 | if (r) | |
733 | return r; | |
734 | ||
735 | disk_super = dm_block_data(sblock); | |
736 | pmd->time = le32_to_cpu(disk_super->time); | |
737 | pmd->root = le64_to_cpu(disk_super->data_mapping_root); | |
738 | pmd->details_root = le64_to_cpu(disk_super->device_details_root); | |
739 | pmd->trans_id = le64_to_cpu(disk_super->trans_id); | |
740 | pmd->flags = le32_to_cpu(disk_super->flags); | |
741 | pmd->data_block_size = le32_to_cpu(disk_super->data_block_size); | |
742 | ||
991d9fa0 | 743 | dm_bm_unlock(sblock); |
d73ec525 | 744 | return 0; |
991d9fa0 JT |
745 | } |
746 | ||
747 | static int __write_changed_details(struct dm_pool_metadata *pmd) | |
748 | { | |
749 | int r; | |
750 | struct dm_thin_device *td, *tmp; | |
751 | struct disk_device_details details; | |
752 | uint64_t key; | |
753 | ||
754 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
755 | if (!td->changed) | |
756 | continue; | |
757 | ||
758 | key = td->id; | |
759 | ||
760 | details.mapped_blocks = cpu_to_le64(td->mapped_blocks); | |
761 | details.transaction_id = cpu_to_le64(td->transaction_id); | |
762 | details.creation_time = cpu_to_le32(td->creation_time); | |
763 | details.snapshotted_time = cpu_to_le32(td->snapshotted_time); | |
764 | __dm_bless_for_disk(&details); | |
765 | ||
766 | r = dm_btree_insert(&pmd->details_info, pmd->details_root, | |
767 | &key, &details, &pmd->details_root); | |
768 | if (r) | |
769 | return r; | |
770 | ||
771 | if (td->open_count) | |
772 | td->changed = 0; | |
773 | else { | |
774 | list_del(&td->list); | |
775 | kfree(td); | |
776 | } | |
991d9fa0 JT |
777 | } |
778 | ||
779 | return 0; | |
780 | } | |
781 | ||
782 | static int __commit_transaction(struct dm_pool_metadata *pmd) | |
783 | { | |
991d9fa0 | 784 | int r; |
991d9fa0 JT |
785 | struct thin_disk_superblock *disk_super; |
786 | struct dm_block *sblock; | |
787 | ||
788 | /* | |
789 | * We need to know if the thin_disk_superblock exceeds a 512-byte sector. | |
790 | */ | |
791 | BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512); | |
792 | ||
793 | r = __write_changed_details(pmd); | |
794 | if (r < 0) | |
d973ac19 | 795 | return r; |
991d9fa0 | 796 | |
991d9fa0 JT |
797 | r = dm_sm_commit(pmd->data_sm); |
798 | if (r < 0) | |
d973ac19 | 799 | return r; |
991d9fa0 JT |
800 | |
801 | r = dm_tm_pre_commit(pmd->tm); | |
802 | if (r < 0) | |
d973ac19 | 803 | return r; |
991d9fa0 | 804 | |
5a32083d JT |
805 | r = save_sm_roots(pmd); |
806 | if (r < 0) | |
807 | return r; | |
808 | ||
25971192 | 809 | r = superblock_lock(pmd, &sblock); |
991d9fa0 | 810 | if (r) |
d973ac19 | 811 | return r; |
991d9fa0 JT |
812 | |
813 | disk_super = dm_block_data(sblock); | |
814 | disk_super->time = cpu_to_le32(pmd->time); | |
815 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
816 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
817 | disk_super->trans_id = cpu_to_le64(pmd->trans_id); | |
818 | disk_super->flags = cpu_to_le32(pmd->flags); | |
819 | ||
5a32083d | 820 | copy_sm_roots(pmd, disk_super); |
991d9fa0 | 821 | |
eb04cf63 | 822 | return dm_tm_commit(pmd->tm, sblock); |
991d9fa0 JT |
823 | } |
824 | ||
3ab91828 JT |
825 | static void __set_metadata_reserve(struct dm_pool_metadata *pmd) |
826 | { | |
827 | int r; | |
828 | dm_block_t total; | |
829 | dm_block_t max_blocks = 4096; /* 16M */ | |
830 | ||
831 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, &total); | |
832 | if (r) { | |
833 | DMERR("could not get size of metadata device"); | |
834 | pmd->metadata_reserve = max_blocks; | |
013ad043 MS |
835 | } else |
836 | pmd->metadata_reserve = min(max_blocks, div_u64(total, 10)); | |
3ab91828 JT |
837 | } |
838 | ||
991d9fa0 | 839 | struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, |
66b1edc0 JT |
840 | sector_t data_block_size, |
841 | bool format_device) | |
991d9fa0 JT |
842 | { |
843 | int r; | |
991d9fa0 | 844 | struct dm_pool_metadata *pmd; |
991d9fa0 JT |
845 | |
846 | pmd = kmalloc(sizeof(*pmd), GFP_KERNEL); | |
847 | if (!pmd) { | |
848 | DMERR("could not allocate metadata struct"); | |
849 | return ERR_PTR(-ENOMEM); | |
850 | } | |
851 | ||
6a0ebd31 JT |
852 | init_rwsem(&pmd->root_lock); |
853 | pmd->time = 0; | |
854 | INIT_LIST_HEAD(&pmd->thin_devices); | |
da105ed5 | 855 | pmd->fail_io = false; |
332627db | 856 | pmd->bdev = bdev; |
9cb6653f | 857 | pmd->data_block_size = data_block_size; |
991d9fa0 | 858 | |
66b1edc0 | 859 | r = __create_persistent_data_objects(pmd, format_device); |
991d9fa0 | 860 | if (r) { |
991d9fa0 JT |
861 | kfree(pmd); |
862 | return ERR_PTR(r); | |
863 | } | |
991d9fa0 | 864 | |
270938ba JT |
865 | r = __begin_transaction(pmd); |
866 | if (r < 0) { | |
867 | if (dm_pool_metadata_close(pmd) < 0) | |
868 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); | |
869 | return ERR_PTR(r); | |
991d9fa0 JT |
870 | } |
871 | ||
3ab91828 JT |
872 | __set_metadata_reserve(pmd); |
873 | ||
991d9fa0 | 874 | return pmd; |
991d9fa0 JT |
875 | } |
876 | ||
877 | int dm_pool_metadata_close(struct dm_pool_metadata *pmd) | |
878 | { | |
879 | int r; | |
880 | unsigned open_devices = 0; | |
881 | struct dm_thin_device *td, *tmp; | |
882 | ||
883 | down_read(&pmd->root_lock); | |
884 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
885 | if (td->open_count) | |
886 | open_devices++; | |
887 | else { | |
888 | list_del(&td->list); | |
889 | kfree(td); | |
890 | } | |
891 | } | |
892 | up_read(&pmd->root_lock); | |
893 | ||
894 | if (open_devices) { | |
895 | DMERR("attempt to close pmd when %u device(s) are still open", | |
896 | open_devices); | |
897 | return -EBUSY; | |
898 | } | |
899 | ||
49f154c7 | 900 | if (!dm_bm_is_read_only(pmd->bm) && !pmd->fail_io) { |
12ba58af JT |
901 | r = __commit_transaction(pmd); |
902 | if (r < 0) | |
903 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
904 | __func__, r); | |
905 | } | |
991d9fa0 | 906 | |
da105ed5 JT |
907 | if (!pmd->fail_io) |
908 | __destroy_persistent_data_objects(pmd); | |
991d9fa0 | 909 | |
da105ed5 | 910 | kfree(pmd); |
991d9fa0 JT |
911 | return 0; |
912 | } | |
913 | ||
1f3db25d MS |
914 | /* |
915 | * __open_device: Returns @td corresponding to device with id @dev, | |
916 | * creating it if @create is set and incrementing @td->open_count. | |
917 | * On failure, @td is undefined. | |
918 | */ | |
991d9fa0 JT |
919 | static int __open_device(struct dm_pool_metadata *pmd, |
920 | dm_thin_id dev, int create, | |
921 | struct dm_thin_device **td) | |
922 | { | |
923 | int r, changed = 0; | |
924 | struct dm_thin_device *td2; | |
925 | uint64_t key = dev; | |
926 | struct disk_device_details details_le; | |
927 | ||
928 | /* | |
1f3db25d | 929 | * If the device is already open, return it. |
991d9fa0 JT |
930 | */ |
931 | list_for_each_entry(td2, &pmd->thin_devices, list) | |
932 | if (td2->id == dev) { | |
1f3db25d MS |
933 | /* |
934 | * May not create an already-open device. | |
935 | */ | |
936 | if (create) | |
937 | return -EEXIST; | |
938 | ||
991d9fa0 JT |
939 | td2->open_count++; |
940 | *td = td2; | |
941 | return 0; | |
942 | } | |
943 | ||
944 | /* | |
945 | * Check the device exists. | |
946 | */ | |
947 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
948 | &key, &details_le); | |
949 | if (r) { | |
950 | if (r != -ENODATA || !create) | |
951 | return r; | |
952 | ||
1f3db25d MS |
953 | /* |
954 | * Create new device. | |
955 | */ | |
991d9fa0 JT |
956 | changed = 1; |
957 | details_le.mapped_blocks = 0; | |
958 | details_le.transaction_id = cpu_to_le64(pmd->trans_id); | |
959 | details_le.creation_time = cpu_to_le32(pmd->time); | |
960 | details_le.snapshotted_time = cpu_to_le32(pmd->time); | |
961 | } | |
962 | ||
963 | *td = kmalloc(sizeof(**td), GFP_NOIO); | |
964 | if (!*td) | |
965 | return -ENOMEM; | |
966 | ||
967 | (*td)->pmd = pmd; | |
968 | (*td)->id = dev; | |
969 | (*td)->open_count = 1; | |
970 | (*td)->changed = changed; | |
da105ed5 | 971 | (*td)->aborted_with_changes = false; |
991d9fa0 JT |
972 | (*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks); |
973 | (*td)->transaction_id = le64_to_cpu(details_le.transaction_id); | |
974 | (*td)->creation_time = le32_to_cpu(details_le.creation_time); | |
975 | (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time); | |
976 | ||
977 | list_add(&(*td)->list, &pmd->thin_devices); | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
982 | static void __close_device(struct dm_thin_device *td) | |
983 | { | |
984 | --td->open_count; | |
985 | } | |
986 | ||
987 | static int __create_thin(struct dm_pool_metadata *pmd, | |
988 | dm_thin_id dev) | |
989 | { | |
990 | int r; | |
991 | dm_block_t dev_root; | |
992 | uint64_t key = dev; | |
993 | struct disk_device_details details_le; | |
994 | struct dm_thin_device *td; | |
995 | __le64 value; | |
996 | ||
997 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
998 | &key, &details_le); | |
999 | if (!r) | |
1000 | return -EEXIST; | |
1001 | ||
1002 | /* | |
1003 | * Create an empty btree for the mappings. | |
1004 | */ | |
1005 | r = dm_btree_empty(&pmd->bl_info, &dev_root); | |
1006 | if (r) | |
1007 | return r; | |
1008 | ||
1009 | /* | |
1010 | * Insert it into the main mapping tree. | |
1011 | */ | |
1012 | value = cpu_to_le64(dev_root); | |
1013 | __dm_bless_for_disk(&value); | |
1014 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1015 | if (r) { | |
1016 | dm_btree_del(&pmd->bl_info, dev_root); | |
1017 | return r; | |
1018 | } | |
1019 | ||
1020 | r = __open_device(pmd, dev, 1, &td); | |
1021 | if (r) { | |
991d9fa0 JT |
1022 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1023 | dm_btree_del(&pmd->bl_info, dev_root); | |
1024 | return r; | |
1025 | } | |
991d9fa0 JT |
1026 | __close_device(td); |
1027 | ||
1028 | return r; | |
1029 | } | |
1030 | ||
1031 | int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1032 | { | |
da105ed5 | 1033 | int r = -EINVAL; |
991d9fa0 JT |
1034 | |
1035 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1036 | if (!pmd->fail_io) |
1037 | r = __create_thin(pmd, dev); | |
991d9fa0 JT |
1038 | up_write(&pmd->root_lock); |
1039 | ||
1040 | return r; | |
1041 | } | |
1042 | ||
1043 | static int __set_snapshot_details(struct dm_pool_metadata *pmd, | |
1044 | struct dm_thin_device *snap, | |
1045 | dm_thin_id origin, uint32_t time) | |
1046 | { | |
1047 | int r; | |
1048 | struct dm_thin_device *td; | |
1049 | ||
1050 | r = __open_device(pmd, origin, 0, &td); | |
1051 | if (r) | |
1052 | return r; | |
1053 | ||
1054 | td->changed = 1; | |
1055 | td->snapshotted_time = time; | |
1056 | ||
1057 | snap->mapped_blocks = td->mapped_blocks; | |
1058 | snap->snapshotted_time = time; | |
1059 | __close_device(td); | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static int __create_snap(struct dm_pool_metadata *pmd, | |
1065 | dm_thin_id dev, dm_thin_id origin) | |
1066 | { | |
1067 | int r; | |
1068 | dm_block_t origin_root; | |
1069 | uint64_t key = origin, dev_key = dev; | |
1070 | struct dm_thin_device *td; | |
1071 | struct disk_device_details details_le; | |
1072 | __le64 value; | |
1073 | ||
1074 | /* check this device is unused */ | |
1075 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
1076 | &dev_key, &details_le); | |
1077 | if (!r) | |
1078 | return -EEXIST; | |
1079 | ||
1080 | /* find the mapping tree for the origin */ | |
1081 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value); | |
1082 | if (r) | |
1083 | return r; | |
1084 | origin_root = le64_to_cpu(value); | |
1085 | ||
1086 | /* clone the origin, an inc will do */ | |
1087 | dm_tm_inc(pmd->tm, origin_root); | |
1088 | ||
1089 | /* insert into the main mapping tree */ | |
1090 | value = cpu_to_le64(origin_root); | |
1091 | __dm_bless_for_disk(&value); | |
1092 | key = dev; | |
1093 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1094 | if (r) { | |
1095 | dm_tm_dec(pmd->tm, origin_root); | |
1096 | return r; | |
1097 | } | |
1098 | ||
1099 | pmd->time++; | |
1100 | ||
1101 | r = __open_device(pmd, dev, 1, &td); | |
1102 | if (r) | |
1103 | goto bad; | |
1104 | ||
1105 | r = __set_snapshot_details(pmd, td, origin, pmd->time); | |
1f3db25d MS |
1106 | __close_device(td); |
1107 | ||
991d9fa0 JT |
1108 | if (r) |
1109 | goto bad; | |
1110 | ||
991d9fa0 JT |
1111 | return 0; |
1112 | ||
1113 | bad: | |
991d9fa0 JT |
1114 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1115 | dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1116 | &key, &pmd->details_root); | |
1117 | return r; | |
1118 | } | |
1119 | ||
1120 | int dm_pool_create_snap(struct dm_pool_metadata *pmd, | |
1121 | dm_thin_id dev, | |
1122 | dm_thin_id origin) | |
1123 | { | |
da105ed5 | 1124 | int r = -EINVAL; |
991d9fa0 JT |
1125 | |
1126 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1127 | if (!pmd->fail_io) |
1128 | r = __create_snap(pmd, dev, origin); | |
991d9fa0 JT |
1129 | up_write(&pmd->root_lock); |
1130 | ||
1131 | return r; | |
1132 | } | |
1133 | ||
1134 | static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1135 | { | |
1136 | int r; | |
1137 | uint64_t key = dev; | |
1138 | struct dm_thin_device *td; | |
1139 | ||
1140 | /* TODO: failure should mark the transaction invalid */ | |
1141 | r = __open_device(pmd, dev, 0, &td); | |
1142 | if (r) | |
1143 | return r; | |
1144 | ||
1145 | if (td->open_count > 1) { | |
1146 | __close_device(td); | |
1147 | return -EBUSY; | |
1148 | } | |
1149 | ||
1150 | list_del(&td->list); | |
1151 | kfree(td); | |
1152 | r = dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1153 | &key, &pmd->details_root); | |
1154 | if (r) | |
1155 | return r; | |
1156 | ||
1157 | r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); | |
1158 | if (r) | |
1159 | return r; | |
1160 | ||
991d9fa0 JT |
1161 | return 0; |
1162 | } | |
1163 | ||
1164 | int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, | |
1165 | dm_thin_id dev) | |
1166 | { | |
da105ed5 | 1167 | int r = -EINVAL; |
991d9fa0 JT |
1168 | |
1169 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1170 | if (!pmd->fail_io) |
1171 | r = __delete_device(pmd, dev); | |
991d9fa0 JT |
1172 | up_write(&pmd->root_lock); |
1173 | ||
1174 | return r; | |
1175 | } | |
1176 | ||
1177 | int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1178 | uint64_t current_id, | |
1179 | uint64_t new_id) | |
1180 | { | |
da105ed5 JT |
1181 | int r = -EINVAL; |
1182 | ||
991d9fa0 | 1183 | down_write(&pmd->root_lock); |
da105ed5 JT |
1184 | |
1185 | if (pmd->fail_io) | |
1186 | goto out; | |
1187 | ||
991d9fa0 | 1188 | if (pmd->trans_id != current_id) { |
991d9fa0 | 1189 | DMERR("mismatched transaction id"); |
da105ed5 | 1190 | goto out; |
991d9fa0 JT |
1191 | } |
1192 | ||
1193 | pmd->trans_id = new_id; | |
da105ed5 JT |
1194 | r = 0; |
1195 | ||
1196 | out: | |
991d9fa0 JT |
1197 | up_write(&pmd->root_lock); |
1198 | ||
da105ed5 | 1199 | return r; |
991d9fa0 JT |
1200 | } |
1201 | ||
1202 | int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1203 | uint64_t *result) | |
1204 | { | |
da105ed5 JT |
1205 | int r = -EINVAL; |
1206 | ||
991d9fa0 | 1207 | down_read(&pmd->root_lock); |
da105ed5 JT |
1208 | if (!pmd->fail_io) { |
1209 | *result = pmd->trans_id; | |
1210 | r = 0; | |
1211 | } | |
991d9fa0 JT |
1212 | up_read(&pmd->root_lock); |
1213 | ||
da105ed5 | 1214 | return r; |
991d9fa0 JT |
1215 | } |
1216 | ||
cc8394d8 JT |
1217 | static int __reserve_metadata_snap(struct dm_pool_metadata *pmd) |
1218 | { | |
1219 | int r, inc; | |
1220 | struct thin_disk_superblock *disk_super; | |
1221 | struct dm_block *copy, *sblock; | |
1222 | dm_block_t held_root; | |
1223 | ||
49e99fc7 JT |
1224 | /* |
1225 | * We commit to ensure the btree roots which we increment in a | |
1226 | * moment are up to date. | |
1227 | */ | |
1228 | __commit_transaction(pmd); | |
1229 | ||
cc8394d8 JT |
1230 | /* |
1231 | * Copy the superblock. | |
1232 | */ | |
1233 | dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION); | |
1234 | r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION, | |
1235 | &sb_validator, ©, &inc); | |
1236 | if (r) | |
1237 | return r; | |
1238 | ||
1239 | BUG_ON(!inc); | |
1240 | ||
1241 | held_root = dm_block_location(copy); | |
1242 | disk_super = dm_block_data(copy); | |
1243 | ||
1244 | if (le64_to_cpu(disk_super->held_root)) { | |
1245 | DMWARN("Pool metadata snapshot already exists: release this before taking another."); | |
1246 | ||
1247 | dm_tm_dec(pmd->tm, held_root); | |
1248 | dm_tm_unlock(pmd->tm, copy); | |
cc8394d8 JT |
1249 | return -EBUSY; |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * Wipe the spacemap since we're not publishing this. | |
1254 | */ | |
1255 | memset(&disk_super->data_space_map_root, 0, | |
1256 | sizeof(disk_super->data_space_map_root)); | |
1257 | memset(&disk_super->metadata_space_map_root, 0, | |
1258 | sizeof(disk_super->metadata_space_map_root)); | |
1259 | ||
1260 | /* | |
1261 | * Increment the data structures that need to be preserved. | |
1262 | */ | |
1263 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root)); | |
1264 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root)); | |
1265 | dm_tm_unlock(pmd->tm, copy); | |
1266 | ||
1267 | /* | |
1268 | * Write the held root into the superblock. | |
1269 | */ | |
25971192 | 1270 | r = superblock_lock(pmd, &sblock); |
cc8394d8 JT |
1271 | if (r) { |
1272 | dm_tm_dec(pmd->tm, held_root); | |
cc8394d8 JT |
1273 | return r; |
1274 | } | |
1275 | ||
1276 | disk_super = dm_block_data(sblock); | |
1277 | disk_super->held_root = cpu_to_le64(held_root); | |
1278 | dm_bm_unlock(sblock); | |
cc8394d8 JT |
1279 | return 0; |
1280 | } | |
1281 | ||
1282 | int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd) | |
1283 | { | |
da105ed5 | 1284 | int r = -EINVAL; |
cc8394d8 JT |
1285 | |
1286 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1287 | if (!pmd->fail_io) |
1288 | r = __reserve_metadata_snap(pmd); | |
cc8394d8 JT |
1289 | up_write(&pmd->root_lock); |
1290 | ||
1291 | return r; | |
1292 | } | |
1293 | ||
1294 | static int __release_metadata_snap(struct dm_pool_metadata *pmd) | |
991d9fa0 JT |
1295 | { |
1296 | int r; | |
1297 | struct thin_disk_superblock *disk_super; | |
cc8394d8 JT |
1298 | struct dm_block *sblock, *copy; |
1299 | dm_block_t held_root; | |
991d9fa0 | 1300 | |
25971192 | 1301 | r = superblock_lock(pmd, &sblock); |
991d9fa0 JT |
1302 | if (r) |
1303 | return r; | |
1304 | ||
cc8394d8 JT |
1305 | disk_super = dm_block_data(sblock); |
1306 | held_root = le64_to_cpu(disk_super->held_root); | |
1307 | disk_super->held_root = cpu_to_le64(0); | |
cc8394d8 JT |
1308 | |
1309 | dm_bm_unlock(sblock); | |
1310 | ||
1311 | if (!held_root) { | |
1312 | DMWARN("No pool metadata snapshot found: nothing to release."); | |
1313 | return -EINVAL; | |
1314 | } | |
1315 | ||
1316 | r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, ©); | |
1317 | if (r) | |
1318 | return r; | |
1319 | ||
1320 | disk_super = dm_block_data(copy); | |
7f518ad0 JT |
1321 | dm_btree_del(&pmd->info, le64_to_cpu(disk_super->data_mapping_root)); |
1322 | dm_btree_del(&pmd->details_info, le64_to_cpu(disk_super->device_details_root)); | |
cc8394d8 JT |
1323 | dm_sm_dec_block(pmd->metadata_sm, held_root); |
1324 | ||
4c7da06f MP |
1325 | dm_tm_unlock(pmd->tm, copy); |
1326 | ||
1327 | return 0; | |
cc8394d8 JT |
1328 | } |
1329 | ||
1330 | int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd) | |
1331 | { | |
da105ed5 | 1332 | int r = -EINVAL; |
cc8394d8 JT |
1333 | |
1334 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1335 | if (!pmd->fail_io) |
1336 | r = __release_metadata_snap(pmd); | |
cc8394d8 JT |
1337 | up_write(&pmd->root_lock); |
1338 | ||
1339 | return r; | |
1340 | } | |
1341 | ||
1342 | static int __get_metadata_snap(struct dm_pool_metadata *pmd, | |
1343 | dm_block_t *result) | |
1344 | { | |
1345 | int r; | |
1346 | struct thin_disk_superblock *disk_super; | |
1347 | struct dm_block *sblock; | |
1348 | ||
1349 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
1350 | &sb_validator, &sblock); | |
1351 | if (r) | |
1352 | return r; | |
1353 | ||
991d9fa0 JT |
1354 | disk_super = dm_block_data(sblock); |
1355 | *result = le64_to_cpu(disk_super->held_root); | |
1356 | ||
4c7da06f MP |
1357 | dm_bm_unlock(sblock); |
1358 | ||
1359 | return 0; | |
991d9fa0 JT |
1360 | } |
1361 | ||
cc8394d8 JT |
1362 | int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd, |
1363 | dm_block_t *result) | |
991d9fa0 | 1364 | { |
da105ed5 | 1365 | int r = -EINVAL; |
991d9fa0 JT |
1366 | |
1367 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1368 | if (!pmd->fail_io) |
1369 | r = __get_metadata_snap(pmd, result); | |
991d9fa0 JT |
1370 | up_read(&pmd->root_lock); |
1371 | ||
1372 | return r; | |
1373 | } | |
1374 | ||
1375 | int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, | |
1376 | struct dm_thin_device **td) | |
1377 | { | |
da105ed5 | 1378 | int r = -EINVAL; |
991d9fa0 JT |
1379 | |
1380 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1381 | if (!pmd->fail_io) |
1382 | r = __open_device(pmd, dev, 0, td); | |
991d9fa0 JT |
1383 | up_write(&pmd->root_lock); |
1384 | ||
1385 | return r; | |
1386 | } | |
1387 | ||
1388 | int dm_pool_close_thin_device(struct dm_thin_device *td) | |
1389 | { | |
1390 | down_write(&td->pmd->root_lock); | |
1391 | __close_device(td); | |
1392 | up_write(&td->pmd->root_lock); | |
1393 | ||
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | dm_thin_id dm_thin_dev_id(struct dm_thin_device *td) | |
1398 | { | |
1399 | return td->id; | |
1400 | } | |
1401 | ||
19fa1a67 JT |
1402 | /* |
1403 | * Check whether @time (of block creation) is older than @td's last snapshot. | |
1404 | * If so then the associated block is shared with the last snapshot device. | |
1405 | * Any block on a device created *after* the device last got snapshotted is | |
1406 | * necessarily not shared. | |
1407 | */ | |
17b7d63f | 1408 | static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time) |
991d9fa0 JT |
1409 | { |
1410 | return td->snapshotted_time > time; | |
1411 | } | |
1412 | ||
3d5f6733 JT |
1413 | static void unpack_lookup_result(struct dm_thin_device *td, __le64 value, |
1414 | struct dm_thin_lookup_result *result) | |
1415 | { | |
1416 | uint64_t block_time = 0; | |
1417 | dm_block_t exception_block; | |
1418 | uint32_t exception_time; | |
1419 | ||
1420 | block_time = le64_to_cpu(value); | |
1421 | unpack_block_time(block_time, &exception_block, &exception_time); | |
1422 | result->block = exception_block; | |
1423 | result->shared = __snapshotted_since(td, exception_time); | |
1424 | } | |
1425 | ||
086fbbbd JT |
1426 | static int __find_block(struct dm_thin_device *td, dm_block_t block, |
1427 | int can_issue_io, struct dm_thin_lookup_result *result) | |
991d9fa0 | 1428 | { |
e5cfc69a | 1429 | int r; |
991d9fa0 JT |
1430 | __le64 value; |
1431 | struct dm_pool_metadata *pmd = td->pmd; | |
1432 | dm_block_t keys[2] = { td->id, block }; | |
da105ed5 | 1433 | struct dm_btree_info *info; |
991d9fa0 | 1434 | |
e5cfc69a JT |
1435 | if (can_issue_io) { |
1436 | info = &pmd->info; | |
1437 | } else | |
1438 | info = &pmd->nb_info; | |
da105ed5 | 1439 | |
e5cfc69a | 1440 | r = dm_btree_lookup(info, pmd->root, keys, &value); |
3d5f6733 JT |
1441 | if (!r) |
1442 | unpack_lookup_result(td, value, result); | |
1443 | ||
3d5f6733 JT |
1444 | return r; |
1445 | } | |
1446 | ||
086fbbbd JT |
1447 | int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, |
1448 | int can_issue_io, struct dm_thin_lookup_result *result) | |
3d5f6733 JT |
1449 | { |
1450 | int r; | |
3d5f6733 | 1451 | struct dm_pool_metadata *pmd = td->pmd; |
3d5f6733 JT |
1452 | |
1453 | down_read(&pmd->root_lock); | |
1454 | if (pmd->fail_io) { | |
1455 | up_read(&pmd->root_lock); | |
1456 | return -EINVAL; | |
991d9fa0 JT |
1457 | } |
1458 | ||
086fbbbd JT |
1459 | r = __find_block(td, block, can_issue_io, result); |
1460 | ||
1461 | up_read(&pmd->root_lock); | |
1462 | return r; | |
1463 | } | |
1464 | ||
1465 | static int __find_next_mapped_block(struct dm_thin_device *td, dm_block_t block, | |
1466 | dm_block_t *vblock, | |
1467 | struct dm_thin_lookup_result *result) | |
1468 | { | |
1469 | int r; | |
1470 | __le64 value; | |
1471 | struct dm_pool_metadata *pmd = td->pmd; | |
1472 | dm_block_t keys[2] = { td->id, block }; | |
1473 | ||
3d5f6733 JT |
1474 | r = dm_btree_lookup_next(&pmd->info, pmd->root, keys, vblock, &value); |
1475 | if (!r) | |
1476 | unpack_lookup_result(td, value, result); | |
1477 | ||
991d9fa0 JT |
1478 | return r; |
1479 | } | |
1480 | ||
086fbbbd JT |
1481 | static int __find_mapped_range(struct dm_thin_device *td, |
1482 | dm_block_t begin, dm_block_t end, | |
1483 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1484 | dm_block_t *pool_begin, bool *maybe_shared) | |
a5d895a9 JT |
1485 | { |
1486 | int r; | |
1487 | dm_block_t pool_end; | |
1488 | struct dm_thin_lookup_result lookup; | |
1489 | ||
1490 | if (end < begin) | |
1491 | return -ENODATA; | |
1492 | ||
086fbbbd | 1493 | r = __find_next_mapped_block(td, begin, &begin, &lookup); |
3d5f6733 JT |
1494 | if (r) |
1495 | return r; | |
a5d895a9 | 1496 | |
3d5f6733 | 1497 | if (begin >= end) |
a5d895a9 JT |
1498 | return -ENODATA; |
1499 | ||
1500 | *thin_begin = begin; | |
1501 | *pool_begin = lookup.block; | |
1502 | *maybe_shared = lookup.shared; | |
1503 | ||
1504 | begin++; | |
1505 | pool_end = *pool_begin + 1; | |
1506 | while (begin != end) { | |
086fbbbd | 1507 | r = __find_block(td, begin, true, &lookup); |
a5d895a9 JT |
1508 | if (r) { |
1509 | if (r == -ENODATA) | |
1510 | break; | |
1511 | else | |
1512 | return r; | |
1513 | } | |
1514 | ||
1515 | if ((lookup.block != pool_end) || | |
1516 | (lookup.shared != *maybe_shared)) | |
1517 | break; | |
1518 | ||
1519 | pool_end++; | |
1520 | begin++; | |
1521 | } | |
1522 | ||
1523 | *thin_end = begin; | |
1524 | return 0; | |
1525 | } | |
1526 | ||
086fbbbd JT |
1527 | int dm_thin_find_mapped_range(struct dm_thin_device *td, |
1528 | dm_block_t begin, dm_block_t end, | |
1529 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1530 | dm_block_t *pool_begin, bool *maybe_shared) | |
1531 | { | |
1532 | int r = -EINVAL; | |
1533 | struct dm_pool_metadata *pmd = td->pmd; | |
1534 | ||
1535 | down_read(&pmd->root_lock); | |
1536 | if (!pmd->fail_io) { | |
1537 | r = __find_mapped_range(td, begin, end, thin_begin, thin_end, | |
1538 | pool_begin, maybe_shared); | |
1539 | } | |
1540 | up_read(&pmd->root_lock); | |
1541 | ||
1542 | return r; | |
1543 | } | |
1544 | ||
991d9fa0 JT |
1545 | static int __insert(struct dm_thin_device *td, dm_block_t block, |
1546 | dm_block_t data_block) | |
1547 | { | |
1548 | int r, inserted; | |
1549 | __le64 value; | |
1550 | struct dm_pool_metadata *pmd = td->pmd; | |
1551 | dm_block_t keys[2] = { td->id, block }; | |
1552 | ||
991d9fa0 JT |
1553 | value = cpu_to_le64(pack_block_time(data_block, pmd->time)); |
1554 | __dm_bless_for_disk(&value); | |
1555 | ||
1556 | r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value, | |
1557 | &pmd->root, &inserted); | |
1558 | if (r) | |
1559 | return r; | |
1560 | ||
40db5a53 JT |
1561 | td->changed = 1; |
1562 | if (inserted) | |
991d9fa0 | 1563 | td->mapped_blocks++; |
991d9fa0 JT |
1564 | |
1565 | return 0; | |
1566 | } | |
1567 | ||
1568 | int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, | |
1569 | dm_block_t data_block) | |
1570 | { | |
da105ed5 | 1571 | int r = -EINVAL; |
991d9fa0 JT |
1572 | |
1573 | down_write(&td->pmd->root_lock); | |
da105ed5 JT |
1574 | if (!td->pmd->fail_io) |
1575 | r = __insert(td, block, data_block); | |
991d9fa0 JT |
1576 | up_write(&td->pmd->root_lock); |
1577 | ||
1578 | return r; | |
1579 | } | |
1580 | ||
1581 | static int __remove(struct dm_thin_device *td, dm_block_t block) | |
1582 | { | |
1583 | int r; | |
1584 | struct dm_pool_metadata *pmd = td->pmd; | |
1585 | dm_block_t keys[2] = { td->id, block }; | |
1586 | ||
1587 | r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root); | |
1588 | if (r) | |
1589 | return r; | |
1590 | ||
af63bcb8 JT |
1591 | td->mapped_blocks--; |
1592 | td->changed = 1; | |
991d9fa0 JT |
1593 | |
1594 | return 0; | |
1595 | } | |
1596 | ||
6550f075 JT |
1597 | static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end) |
1598 | { | |
1599 | int r; | |
993ceab9 | 1600 | unsigned count, total_count = 0; |
6550f075 JT |
1601 | struct dm_pool_metadata *pmd = td->pmd; |
1602 | dm_block_t keys[1] = { td->id }; | |
1603 | __le64 value; | |
1604 | dm_block_t mapping_root; | |
1605 | ||
1606 | /* | |
1607 | * Find the mapping tree | |
1608 | */ | |
1609 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value); | |
1610 | if (r) | |
1611 | return r; | |
1612 | ||
1613 | /* | |
1614 | * Remove from the mapping tree, taking care to inc the | |
1615 | * ref count so it doesn't get deleted. | |
1616 | */ | |
1617 | mapping_root = le64_to_cpu(value); | |
1618 | dm_tm_inc(pmd->tm, mapping_root); | |
1619 | r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root); | |
1620 | if (r) | |
1621 | return r; | |
1622 | ||
993ceab9 JT |
1623 | /* |
1624 | * Remove leaves stops at the first unmapped entry, so we have to | |
1625 | * loop round finding mapped ranges. | |
1626 | */ | |
1627 | while (begin < end) { | |
1628 | r = dm_btree_lookup_next(&pmd->bl_info, mapping_root, &begin, &begin, &value); | |
1629 | if (r == -ENODATA) | |
1630 | break; | |
1631 | ||
1632 | if (r) | |
1633 | return r; | |
1634 | ||
1635 | if (begin >= end) | |
1636 | break; | |
1637 | ||
1638 | r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count); | |
1639 | if (r) | |
1640 | return r; | |
1641 | ||
1642 | total_count += count; | |
1643 | } | |
6550f075 | 1644 | |
993ceab9 | 1645 | td->mapped_blocks -= total_count; |
6550f075 JT |
1646 | td->changed = 1; |
1647 | ||
1648 | /* | |
1649 | * Reinsert the mapping tree. | |
1650 | */ | |
1651 | value = cpu_to_le64(mapping_root); | |
1652 | __dm_bless_for_disk(&value); | |
1653 | return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root); | |
1654 | } | |
1655 | ||
991d9fa0 JT |
1656 | int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) |
1657 | { | |
da105ed5 | 1658 | int r = -EINVAL; |
991d9fa0 JT |
1659 | |
1660 | down_write(&td->pmd->root_lock); | |
da105ed5 JT |
1661 | if (!td->pmd->fail_io) |
1662 | r = __remove(td, block); | |
991d9fa0 | 1663 | up_write(&td->pmd->root_lock); |
19fa1a67 JT |
1664 | |
1665 | return r; | |
1666 | } | |
1667 | ||
6550f075 JT |
1668 | int dm_thin_remove_range(struct dm_thin_device *td, |
1669 | dm_block_t begin, dm_block_t end) | |
1670 | { | |
1671 | int r = -EINVAL; | |
1672 | ||
1673 | down_write(&td->pmd->root_lock); | |
1674 | if (!td->pmd->fail_io) | |
1675 | r = __remove_range(td, begin, end); | |
1676 | up_write(&td->pmd->root_lock); | |
1677 | ||
1678 | return r; | |
1679 | } | |
1680 | ||
d445bd9c | 1681 | int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) |
19fa1a67 JT |
1682 | { |
1683 | int r; | |
1684 | uint32_t ref_count; | |
1685 | ||
1686 | down_read(&pmd->root_lock); | |
1687 | r = dm_sm_get_count(pmd->data_sm, b, &ref_count); | |
1688 | if (!r) | |
d445bd9c | 1689 | *result = (ref_count > 1); |
19fa1a67 | 1690 | up_read(&pmd->root_lock); |
991d9fa0 JT |
1691 | |
1692 | return r; | |
1693 | } | |
1694 | ||
2a0fbffb JT |
1695 | int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) |
1696 | { | |
1697 | int r = 0; | |
1698 | ||
1699 | down_write(&pmd->root_lock); | |
1700 | for (; b != e; b++) { | |
1701 | r = dm_sm_inc_block(pmd->data_sm, b); | |
1702 | if (r) | |
1703 | break; | |
1704 | } | |
1705 | up_write(&pmd->root_lock); | |
1706 | ||
1707 | return r; | |
1708 | } | |
1709 | ||
1710 | int dm_pool_dec_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) | |
1711 | { | |
1712 | int r = 0; | |
1713 | ||
1714 | down_write(&pmd->root_lock); | |
1715 | for (; b != e; b++) { | |
1716 | r = dm_sm_dec_block(pmd->data_sm, b); | |
1717 | if (r) | |
1718 | break; | |
1719 | } | |
1720 | up_write(&pmd->root_lock); | |
1721 | ||
1722 | return r; | |
1723 | } | |
1724 | ||
40db5a53 JT |
1725 | bool dm_thin_changed_this_transaction(struct dm_thin_device *td) |
1726 | { | |
1727 | int r; | |
1728 | ||
1729 | down_read(&td->pmd->root_lock); | |
1730 | r = td->changed; | |
1731 | up_read(&td->pmd->root_lock); | |
1732 | ||
1733 | return r; | |
1734 | } | |
1735 | ||
4d1662a3 MS |
1736 | bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd) |
1737 | { | |
1738 | bool r = false; | |
1739 | struct dm_thin_device *td, *tmp; | |
1740 | ||
1741 | down_read(&pmd->root_lock); | |
1742 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
1743 | if (td->changed) { | |
1744 | r = td->changed; | |
1745 | break; | |
1746 | } | |
1747 | } | |
1748 | up_read(&pmd->root_lock); | |
1749 | ||
1750 | return r; | |
1751 | } | |
1752 | ||
da105ed5 JT |
1753 | bool dm_thin_aborted_changes(struct dm_thin_device *td) |
1754 | { | |
1755 | bool r; | |
1756 | ||
1757 | down_read(&td->pmd->root_lock); | |
1758 | r = td->aborted_with_changes; | |
1759 | up_read(&td->pmd->root_lock); | |
1760 | ||
1761 | return r; | |
1762 | } | |
1763 | ||
991d9fa0 JT |
1764 | int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result) |
1765 | { | |
da105ed5 | 1766 | int r = -EINVAL; |
991d9fa0 JT |
1767 | |
1768 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1769 | if (!pmd->fail_io) |
1770 | r = dm_sm_new_block(pmd->data_sm, result); | |
991d9fa0 JT |
1771 | up_write(&pmd->root_lock); |
1772 | ||
1773 | return r; | |
1774 | } | |
1775 | ||
1776 | int dm_pool_commit_metadata(struct dm_pool_metadata *pmd) | |
1777 | { | |
da105ed5 | 1778 | int r = -EINVAL; |
991d9fa0 JT |
1779 | |
1780 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1781 | if (pmd->fail_io) |
1782 | goto out; | |
991d9fa0 JT |
1783 | |
1784 | r = __commit_transaction(pmd); | |
1785 | if (r <= 0) | |
1786 | goto out; | |
1787 | ||
1788 | /* | |
1789 | * Open the next transaction. | |
1790 | */ | |
1791 | r = __begin_transaction(pmd); | |
1792 | out: | |
1793 | up_write(&pmd->root_lock); | |
1794 | return r; | |
1795 | } | |
1796 | ||
da105ed5 JT |
1797 | static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd) |
1798 | { | |
1799 | struct dm_thin_device *td; | |
1800 | ||
1801 | list_for_each_entry(td, &pmd->thin_devices, list) | |
1802 | td->aborted_with_changes = td->changed; | |
1803 | } | |
1804 | ||
1805 | int dm_pool_abort_metadata(struct dm_pool_metadata *pmd) | |
1806 | { | |
1807 | int r = -EINVAL; | |
1808 | ||
1809 | down_write(&pmd->root_lock); | |
1810 | if (pmd->fail_io) | |
1811 | goto out; | |
1812 | ||
1813 | __set_abort_with_changes_flags(pmd); | |
1814 | __destroy_persistent_data_objects(pmd); | |
1815 | r = __create_persistent_data_objects(pmd, false); | |
1816 | if (r) | |
1817 | pmd->fail_io = true; | |
1818 | ||
1819 | out: | |
1820 | up_write(&pmd->root_lock); | |
1821 | ||
1822 | return r; | |
1823 | } | |
1824 | ||
991d9fa0 JT |
1825 | int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result) |
1826 | { | |
da105ed5 | 1827 | int r = -EINVAL; |
991d9fa0 JT |
1828 | |
1829 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1830 | if (!pmd->fail_io) |
1831 | r = dm_sm_get_nr_free(pmd->data_sm, result); | |
991d9fa0 JT |
1832 | up_read(&pmd->root_lock); |
1833 | ||
1834 | return r; | |
1835 | } | |
1836 | ||
1837 | int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, | |
1838 | dm_block_t *result) | |
1839 | { | |
da105ed5 | 1840 | int r = -EINVAL; |
991d9fa0 JT |
1841 | |
1842 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1843 | if (!pmd->fail_io) |
1844 | r = dm_sm_get_nr_free(pmd->metadata_sm, result); | |
3ab91828 JT |
1845 | |
1846 | if (!r) { | |
1847 | if (*result < pmd->metadata_reserve) | |
1848 | *result = 0; | |
1849 | else | |
1850 | *result -= pmd->metadata_reserve; | |
1851 | } | |
991d9fa0 JT |
1852 | up_read(&pmd->root_lock); |
1853 | ||
1854 | return r; | |
1855 | } | |
1856 | ||
1857 | int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, | |
1858 | dm_block_t *result) | |
1859 | { | |
da105ed5 | 1860 | int r = -EINVAL; |
991d9fa0 JT |
1861 | |
1862 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1863 | if (!pmd->fail_io) |
1864 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, result); | |
991d9fa0 JT |
1865 | up_read(&pmd->root_lock); |
1866 | ||
1867 | return r; | |
1868 | } | |
1869 | ||
991d9fa0 JT |
1870 | int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result) |
1871 | { | |
da105ed5 | 1872 | int r = -EINVAL; |
991d9fa0 JT |
1873 | |
1874 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1875 | if (!pmd->fail_io) |
1876 | r = dm_sm_get_nr_blocks(pmd->data_sm, result); | |
991d9fa0 JT |
1877 | up_read(&pmd->root_lock); |
1878 | ||
1879 | return r; | |
1880 | } | |
1881 | ||
1882 | int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result) | |
1883 | { | |
da105ed5 | 1884 | int r = -EINVAL; |
991d9fa0 JT |
1885 | struct dm_pool_metadata *pmd = td->pmd; |
1886 | ||
1887 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1888 | if (!pmd->fail_io) { |
1889 | *result = td->mapped_blocks; | |
1890 | r = 0; | |
1891 | } | |
991d9fa0 JT |
1892 | up_read(&pmd->root_lock); |
1893 | ||
da105ed5 | 1894 | return r; |
991d9fa0 JT |
1895 | } |
1896 | ||
1897 | static int __highest_block(struct dm_thin_device *td, dm_block_t *result) | |
1898 | { | |
1899 | int r; | |
1900 | __le64 value_le; | |
1901 | dm_block_t thin_root; | |
1902 | struct dm_pool_metadata *pmd = td->pmd; | |
1903 | ||
1904 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le); | |
1905 | if (r) | |
1906 | return r; | |
1907 | ||
1908 | thin_root = le64_to_cpu(value_le); | |
1909 | ||
1910 | return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result); | |
1911 | } | |
1912 | ||
1913 | int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, | |
1914 | dm_block_t *result) | |
1915 | { | |
da105ed5 | 1916 | int r = -EINVAL; |
991d9fa0 JT |
1917 | struct dm_pool_metadata *pmd = td->pmd; |
1918 | ||
1919 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1920 | if (!pmd->fail_io) |
1921 | r = __highest_block(td, result); | |
991d9fa0 JT |
1922 | up_read(&pmd->root_lock); |
1923 | ||
1924 | return r; | |
1925 | } | |
1926 | ||
b17446df | 1927 | static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count) |
991d9fa0 JT |
1928 | { |
1929 | int r; | |
1930 | dm_block_t old_count; | |
1931 | ||
b17446df | 1932 | r = dm_sm_get_nr_blocks(sm, &old_count); |
991d9fa0 JT |
1933 | if (r) |
1934 | return r; | |
1935 | ||
1936 | if (new_count == old_count) | |
1937 | return 0; | |
1938 | ||
1939 | if (new_count < old_count) { | |
b17446df | 1940 | DMERR("cannot reduce size of space map"); |
991d9fa0 JT |
1941 | return -EINVAL; |
1942 | } | |
1943 | ||
b17446df | 1944 | return dm_sm_extend(sm, new_count - old_count); |
991d9fa0 JT |
1945 | } |
1946 | ||
1947 | int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) | |
1948 | { | |
da105ed5 | 1949 | int r = -EINVAL; |
991d9fa0 JT |
1950 | |
1951 | down_write(&pmd->root_lock); | |
da105ed5 | 1952 | if (!pmd->fail_io) |
b17446df | 1953 | r = __resize_space_map(pmd->data_sm, new_count); |
991d9fa0 JT |
1954 | up_write(&pmd->root_lock); |
1955 | ||
1956 | return r; | |
1957 | } | |
12ba58af | 1958 | |
24347e95 JT |
1959 | int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) |
1960 | { | |
1961 | int r = -EINVAL; | |
1962 | ||
1963 | down_write(&pmd->root_lock); | |
3ab91828 | 1964 | if (!pmd->fail_io) { |
24347e95 | 1965 | r = __resize_space_map(pmd->metadata_sm, new_count); |
3ab91828 JT |
1966 | if (!r) |
1967 | __set_metadata_reserve(pmd); | |
1968 | } | |
24347e95 JT |
1969 | up_write(&pmd->root_lock); |
1970 | ||
1971 | return r; | |
1972 | } | |
1973 | ||
12ba58af JT |
1974 | void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) |
1975 | { | |
1976 | down_write(&pmd->root_lock); | |
12ba58af JT |
1977 | dm_bm_set_read_only(pmd->bm); |
1978 | up_write(&pmd->root_lock); | |
1979 | } | |
ac8c3f3d | 1980 | |
9b7aaa64 JT |
1981 | void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd) |
1982 | { | |
1983 | down_write(&pmd->root_lock); | |
9b7aaa64 JT |
1984 | dm_bm_set_read_write(pmd->bm); |
1985 | up_write(&pmd->root_lock); | |
1986 | } | |
1987 | ||
ac8c3f3d JT |
1988 | int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, |
1989 | dm_block_t threshold, | |
1990 | dm_sm_threshold_fn fn, | |
1991 | void *context) | |
1992 | { | |
1993 | int r; | |
1994 | ||
1995 | down_write(&pmd->root_lock); | |
1996 | r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context); | |
1997 | up_write(&pmd->root_lock); | |
1998 | ||
1999 | return r; | |
2000 | } | |
07f2b6e0 MS |
2001 | |
2002 | int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd) | |
2003 | { | |
2004 | int r; | |
2005 | struct dm_block *sblock; | |
2006 | struct thin_disk_superblock *disk_super; | |
2007 | ||
2008 | down_write(&pmd->root_lock); | |
2009 | pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG; | |
2010 | ||
2011 | r = superblock_lock(pmd, &sblock); | |
2012 | if (r) { | |
2013 | DMERR("couldn't read superblock"); | |
2014 | goto out; | |
2015 | } | |
2016 | ||
2017 | disk_super = dm_block_data(sblock); | |
2018 | disk_super->flags = cpu_to_le32(pmd->flags); | |
2019 | ||
2020 | dm_bm_unlock(sblock); | |
2021 | out: | |
2022 | up_write(&pmd->root_lock); | |
2023 | return r; | |
2024 | } | |
2025 | ||
2026 | bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd) | |
2027 | { | |
2028 | bool needs_check; | |
2029 | ||
2030 | down_read(&pmd->root_lock); | |
2031 | needs_check = pmd->flags & THIN_METADATA_NEEDS_CHECK_FLAG; | |
2032 | up_read(&pmd->root_lock); | |
2033 | ||
2034 | return needs_check; | |
2035 | } | |
8a01a6af JT |
2036 | |
2037 | void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd) | |
2038 | { | |
2eae9e44 JT |
2039 | down_read(&pmd->root_lock); |
2040 | if (!pmd->fail_io) | |
2041 | dm_tm_issue_prefetches(pmd->tm); | |
2042 | up_read(&pmd->root_lock); | |
8a01a6af | 2043 | } |