Commit | Line | Data |
---|---|---|
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 THIN_METADATA_CACHE_SIZE 64 |
81 | #define SECTOR_TO_BLOCK_SHIFT 3 | |
82 | ||
8c971178 JT |
83 | /* |
84 | * 3 for btree insert + | |
85 | * 2 for btree lookup used within space map | |
86 | */ | |
87 | #define THIN_MAX_CONCURRENT_LOCKS 5 | |
88 | ||
991d9fa0 JT |
89 | /* This should be plenty */ |
90 | #define SPACE_MAP_ROOT_SIZE 128 | |
91 | ||
92 | /* | |
93 | * Little endian on-disk superblock and device details. | |
94 | */ | |
95 | struct thin_disk_superblock { | |
96 | __le32 csum; /* Checksum of superblock except for this field. */ | |
97 | __le32 flags; | |
98 | __le64 blocknr; /* This block number, dm_block_t. */ | |
99 | ||
100 | __u8 uuid[16]; | |
101 | __le64 magic; | |
102 | __le32 version; | |
103 | __le32 time; | |
104 | ||
105 | __le64 trans_id; | |
106 | ||
107 | /* | |
108 | * Root held by userspace transactions. | |
109 | */ | |
110 | __le64 held_root; | |
111 | ||
112 | __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
113 | __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
114 | ||
115 | /* | |
116 | * 2-level btree mapping (dev_id, (dev block, time)) -> data block | |
117 | */ | |
118 | __le64 data_mapping_root; | |
119 | ||
120 | /* | |
121 | * Device detail root mapping dev_id -> device_details | |
122 | */ | |
123 | __le64 device_details_root; | |
124 | ||
125 | __le32 data_block_size; /* In 512-byte sectors. */ | |
126 | ||
127 | __le32 metadata_block_size; /* In 512-byte sectors. */ | |
128 | __le64 metadata_nr_blocks; | |
129 | ||
130 | __le32 compat_flags; | |
131 | __le32 compat_ro_flags; | |
132 | __le32 incompat_flags; | |
133 | } __packed; | |
134 | ||
135 | struct disk_device_details { | |
136 | __le64 mapped_blocks; | |
137 | __le64 transaction_id; /* When created. */ | |
138 | __le32 creation_time; | |
139 | __le32 snapshotted_time; | |
140 | } __packed; | |
141 | ||
142 | struct dm_pool_metadata { | |
143 | struct hlist_node hash; | |
144 | ||
145 | struct block_device *bdev; | |
146 | struct dm_block_manager *bm; | |
147 | struct dm_space_map *metadata_sm; | |
148 | struct dm_space_map *data_sm; | |
149 | struct dm_transaction_manager *tm; | |
150 | struct dm_transaction_manager *nb_tm; | |
151 | ||
152 | /* | |
153 | * Two-level btree. | |
154 | * First level holds thin_dev_t. | |
155 | * Second level holds mappings. | |
156 | */ | |
157 | struct dm_btree_info info; | |
158 | ||
159 | /* | |
160 | * Non-blocking version of the above. | |
161 | */ | |
162 | struct dm_btree_info nb_info; | |
163 | ||
164 | /* | |
165 | * Just the top level for deleting whole devices. | |
166 | */ | |
167 | struct dm_btree_info tl_info; | |
168 | ||
169 | /* | |
170 | * Just the bottom level for creating new devices. | |
171 | */ | |
172 | struct dm_btree_info bl_info; | |
173 | ||
174 | /* | |
175 | * Describes the device details btree. | |
176 | */ | |
177 | struct dm_btree_info details_info; | |
178 | ||
179 | struct rw_semaphore root_lock; | |
180 | uint32_t time; | |
991d9fa0 JT |
181 | dm_block_t root; |
182 | dm_block_t details_root; | |
183 | struct list_head thin_devices; | |
184 | uint64_t trans_id; | |
185 | unsigned long flags; | |
186 | sector_t data_block_size; | |
da105ed5 JT |
187 | |
188 | /* | |
189 | * Set if a transaction has to be aborted but the attempt to roll back | |
190 | * to the previous (good) transaction failed. The only pool metadata | |
191 | * operation possible in this state is the closing of the device. | |
192 | */ | |
193 | bool fail_io:1; | |
5a32083d JT |
194 | |
195 | /* | |
196 | * Reading the space map roots can fail, so we read it into these | |
197 | * buffers before the superblock is locked and updated. | |
198 | */ | |
199 | __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
200 | __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
991d9fa0 JT |
201 | }; |
202 | ||
203 | struct dm_thin_device { | |
204 | struct list_head list; | |
205 | struct dm_pool_metadata *pmd; | |
206 | dm_thin_id id; | |
207 | ||
208 | int open_count; | |
da105ed5 JT |
209 | bool changed:1; |
210 | bool aborted_with_changes:1; | |
991d9fa0 JT |
211 | uint64_t mapped_blocks; |
212 | uint64_t transaction_id; | |
213 | uint32_t creation_time; | |
214 | uint32_t snapshotted_time; | |
215 | }; | |
216 | ||
217 | /*---------------------------------------------------------------- | |
218 | * superblock validator | |
219 | *--------------------------------------------------------------*/ | |
220 | ||
221 | #define SUPERBLOCK_CSUM_XOR 160774 | |
222 | ||
223 | static void sb_prepare_for_write(struct dm_block_validator *v, | |
224 | struct dm_block *b, | |
225 | size_t block_size) | |
226 | { | |
227 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
228 | ||
229 | disk_super->blocknr = cpu_to_le64(dm_block_location(b)); | |
230 | disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
231 | block_size - sizeof(__le32), | |
232 | SUPERBLOCK_CSUM_XOR)); | |
233 | } | |
234 | ||
235 | static int sb_check(struct dm_block_validator *v, | |
236 | struct dm_block *b, | |
237 | size_t block_size) | |
238 | { | |
239 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
240 | __le32 csum_le; | |
241 | ||
242 | if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) { | |
243 | DMERR("sb_check failed: blocknr %llu: " | |
244 | "wanted %llu", le64_to_cpu(disk_super->blocknr), | |
245 | (unsigned long long)dm_block_location(b)); | |
246 | return -ENOTBLK; | |
247 | } | |
248 | ||
249 | if (le64_to_cpu(disk_super->magic) != THIN_SUPERBLOCK_MAGIC) { | |
250 | DMERR("sb_check failed: magic %llu: " | |
251 | "wanted %llu", le64_to_cpu(disk_super->magic), | |
252 | (unsigned long long)THIN_SUPERBLOCK_MAGIC); | |
253 | return -EILSEQ; | |
254 | } | |
255 | ||
256 | csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
257 | block_size - sizeof(__le32), | |
258 | SUPERBLOCK_CSUM_XOR)); | |
259 | if (csum_le != disk_super->csum) { | |
260 | DMERR("sb_check failed: csum %u: wanted %u", | |
261 | le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum)); | |
262 | return -EILSEQ; | |
263 | } | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | static struct dm_block_validator sb_validator = { | |
269 | .name = "superblock", | |
270 | .prepare_for_write = sb_prepare_for_write, | |
271 | .check = sb_check | |
272 | }; | |
273 | ||
274 | /*---------------------------------------------------------------- | |
275 | * Methods for the btree value types | |
276 | *--------------------------------------------------------------*/ | |
277 | ||
278 | static uint64_t pack_block_time(dm_block_t b, uint32_t t) | |
279 | { | |
280 | return (b << 24) | t; | |
281 | } | |
282 | ||
283 | static void unpack_block_time(uint64_t v, dm_block_t *b, uint32_t *t) | |
284 | { | |
285 | *b = v >> 24; | |
286 | *t = v & ((1 << 24) - 1); | |
287 | } | |
288 | ||
018cede9 | 289 | static void data_block_inc(void *context, const void *value_le) |
991d9fa0 JT |
290 | { |
291 | struct dm_space_map *sm = context; | |
292 | __le64 v_le; | |
293 | uint64_t b; | |
294 | uint32_t t; | |
295 | ||
296 | memcpy(&v_le, value_le, sizeof(v_le)); | |
297 | unpack_block_time(le64_to_cpu(v_le), &b, &t); | |
298 | dm_sm_inc_block(sm, b); | |
299 | } | |
300 | ||
018cede9 | 301 | static void data_block_dec(void *context, const void *value_le) |
991d9fa0 JT |
302 | { |
303 | struct dm_space_map *sm = context; | |
304 | __le64 v_le; | |
305 | uint64_t b; | |
306 | uint32_t t; | |
307 | ||
308 | memcpy(&v_le, value_le, sizeof(v_le)); | |
309 | unpack_block_time(le64_to_cpu(v_le), &b, &t); | |
310 | dm_sm_dec_block(sm, b); | |
311 | } | |
312 | ||
018cede9 | 313 | static int data_block_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
314 | { |
315 | __le64 v1_le, v2_le; | |
316 | uint64_t b1, b2; | |
317 | uint32_t t; | |
318 | ||
319 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
320 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
321 | unpack_block_time(le64_to_cpu(v1_le), &b1, &t); | |
322 | unpack_block_time(le64_to_cpu(v2_le), &b2, &t); | |
323 | ||
324 | return b1 == b2; | |
325 | } | |
326 | ||
018cede9 | 327 | static void subtree_inc(void *context, const void *value) |
991d9fa0 JT |
328 | { |
329 | struct dm_btree_info *info = context; | |
330 | __le64 root_le; | |
331 | uint64_t root; | |
332 | ||
333 | memcpy(&root_le, value, sizeof(root_le)); | |
334 | root = le64_to_cpu(root_le); | |
335 | dm_tm_inc(info->tm, root); | |
336 | } | |
337 | ||
018cede9 | 338 | static void subtree_dec(void *context, const void *value) |
991d9fa0 JT |
339 | { |
340 | struct dm_btree_info *info = context; | |
341 | __le64 root_le; | |
342 | uint64_t root; | |
343 | ||
344 | memcpy(&root_le, value, sizeof(root_le)); | |
345 | root = le64_to_cpu(root_le); | |
346 | if (dm_btree_del(info, root)) | |
347 | DMERR("btree delete failed\n"); | |
348 | } | |
349 | ||
018cede9 | 350 | static int subtree_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
351 | { |
352 | __le64 v1_le, v2_le; | |
353 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
354 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
355 | ||
356 | return v1_le == v2_le; | |
357 | } | |
358 | ||
359 | /*----------------------------------------------------------------*/ | |
360 | ||
25971192 JT |
361 | static int superblock_lock_zero(struct dm_pool_metadata *pmd, |
362 | struct dm_block **sblock) | |
363 | { | |
364 | return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
365 | &sb_validator, sblock); | |
366 | } | |
367 | ||
368 | static int superblock_lock(struct dm_pool_metadata *pmd, | |
369 | struct dm_block **sblock) | |
370 | { | |
371 | return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
372 | &sb_validator, sblock); | |
373 | } | |
374 | ||
332627db | 375 | static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result) |
991d9fa0 JT |
376 | { |
377 | int r; | |
378 | unsigned i; | |
379 | struct dm_block *b; | |
380 | __le64 *data_le, zero = cpu_to_le64(0); | |
381 | unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64); | |
382 | ||
383 | /* | |
384 | * We can't use a validator here - it may be all zeroes. | |
385 | */ | |
386 | r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b); | |
387 | if (r) | |
388 | return r; | |
389 | ||
390 | data_le = dm_block_data(b); | |
391 | *result = 1; | |
392 | for (i = 0; i < block_size; i++) { | |
393 | if (data_le[i] != zero) { | |
394 | *result = 0; | |
395 | break; | |
396 | } | |
397 | } | |
398 | ||
4c7da06f MP |
399 | dm_bm_unlock(b); |
400 | ||
401 | return 0; | |
991d9fa0 JT |
402 | } |
403 | ||
41675aea JT |
404 | static void __setup_btree_details(struct dm_pool_metadata *pmd) |
405 | { | |
406 | pmd->info.tm = pmd->tm; | |
407 | pmd->info.levels = 2; | |
408 | pmd->info.value_type.context = pmd->data_sm; | |
409 | pmd->info.value_type.size = sizeof(__le64); | |
410 | pmd->info.value_type.inc = data_block_inc; | |
411 | pmd->info.value_type.dec = data_block_dec; | |
412 | pmd->info.value_type.equal = data_block_equal; | |
413 | ||
414 | memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info)); | |
415 | pmd->nb_info.tm = pmd->nb_tm; | |
416 | ||
417 | pmd->tl_info.tm = pmd->tm; | |
418 | pmd->tl_info.levels = 1; | |
e3cbf945 | 419 | pmd->tl_info.value_type.context = &pmd->bl_info; |
41675aea JT |
420 | pmd->tl_info.value_type.size = sizeof(__le64); |
421 | pmd->tl_info.value_type.inc = subtree_inc; | |
422 | pmd->tl_info.value_type.dec = subtree_dec; | |
423 | pmd->tl_info.value_type.equal = subtree_equal; | |
424 | ||
425 | pmd->bl_info.tm = pmd->tm; | |
426 | pmd->bl_info.levels = 1; | |
427 | pmd->bl_info.value_type.context = pmd->data_sm; | |
428 | pmd->bl_info.value_type.size = sizeof(__le64); | |
429 | pmd->bl_info.value_type.inc = data_block_inc; | |
430 | pmd->bl_info.value_type.dec = data_block_dec; | |
431 | pmd->bl_info.value_type.equal = data_block_equal; | |
432 | ||
433 | pmd->details_info.tm = pmd->tm; | |
434 | pmd->details_info.levels = 1; | |
435 | pmd->details_info.value_type.context = NULL; | |
436 | pmd->details_info.value_type.size = sizeof(struct disk_device_details); | |
437 | pmd->details_info.value_type.inc = NULL; | |
438 | pmd->details_info.value_type.dec = NULL; | |
439 | pmd->details_info.value_type.equal = NULL; | |
440 | } | |
441 | ||
5a32083d JT |
442 | static int save_sm_roots(struct dm_pool_metadata *pmd) |
443 | { | |
444 | int r; | |
445 | size_t len; | |
446 | ||
447 | r = dm_sm_root_size(pmd->metadata_sm, &len); | |
448 | if (r < 0) | |
449 | return r; | |
450 | ||
451 | r = dm_sm_copy_root(pmd->metadata_sm, &pmd->metadata_space_map_root, len); | |
452 | if (r < 0) | |
453 | return r; | |
454 | ||
455 | r = dm_sm_root_size(pmd->data_sm, &len); | |
456 | if (r < 0) | |
457 | return r; | |
458 | ||
459 | return dm_sm_copy_root(pmd->data_sm, &pmd->data_space_map_root, len); | |
460 | } | |
461 | ||
462 | static void copy_sm_roots(struct dm_pool_metadata *pmd, | |
463 | struct thin_disk_superblock *disk) | |
464 | { | |
465 | memcpy(&disk->metadata_space_map_root, | |
466 | &pmd->metadata_space_map_root, | |
467 | sizeof(pmd->metadata_space_map_root)); | |
468 | ||
469 | memcpy(&disk->data_space_map_root, | |
470 | &pmd->data_space_map_root, | |
471 | sizeof(pmd->data_space_map_root)); | |
472 | } | |
473 | ||
9cb6653f JT |
474 | static int __write_initial_superblock(struct dm_pool_metadata *pmd) |
475 | { | |
476 | int r; | |
477 | struct dm_block *sblock; | |
478 | struct thin_disk_superblock *disk_super; | |
479 | sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT; | |
480 | ||
481 | if (bdev_size > THIN_METADATA_MAX_SECTORS) | |
482 | bdev_size = THIN_METADATA_MAX_SECTORS; | |
483 | ||
5a32083d | 484 | r = dm_sm_commit(pmd->data_sm); |
10d2a9ff JT |
485 | if (r < 0) |
486 | return r; | |
487 | ||
5a32083d | 488 | r = save_sm_roots(pmd); |
10d2a9ff JT |
489 | if (r < 0) |
490 | return r; | |
491 | ||
492 | r = dm_tm_pre_commit(pmd->tm); | |
493 | if (r < 0) | |
494 | return r; | |
495 | ||
9cb6653f JT |
496 | r = superblock_lock_zero(pmd, &sblock); |
497 | if (r) | |
498 | return r; | |
499 | ||
500 | disk_super = dm_block_data(sblock); | |
10d2a9ff | 501 | disk_super->flags = 0; |
583ceee2 | 502 | memset(disk_super->uuid, 0, sizeof(disk_super->uuid)); |
9cb6653f JT |
503 | disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC); |
504 | disk_super->version = cpu_to_le32(THIN_VERSION); | |
505 | disk_super->time = 0; | |
10d2a9ff JT |
506 | disk_super->trans_id = 0; |
507 | disk_super->held_root = 0; | |
508 | ||
5a32083d | 509 | copy_sm_roots(pmd, disk_super); |
10d2a9ff JT |
510 | |
511 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
512 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
7d48935e | 513 | disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE); |
9cb6653f JT |
514 | disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT); |
515 | disk_super->data_block_size = cpu_to_le32(pmd->data_block_size); | |
516 | ||
270938ba | 517 | return dm_tm_commit(pmd->tm, sblock); |
9cb6653f JT |
518 | } |
519 | ||
a97e5e6f | 520 | static int __format_metadata(struct dm_pool_metadata *pmd) |
991d9fa0 JT |
521 | { |
522 | int r; | |
384ef0e6 | 523 | |
e4d2205c JT |
524 | r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
525 | &pmd->tm, &pmd->metadata_sm); | |
526 | if (r < 0) { | |
527 | DMERR("tm_create_with_sm failed"); | |
528 | return r; | |
529 | } | |
991d9fa0 | 530 | |
a97e5e6f | 531 | pmd->data_sm = dm_sm_disk_create(pmd->tm, 0); |
e4d2205c JT |
532 | if (IS_ERR(pmd->data_sm)) { |
533 | DMERR("sm_disk_create failed"); | |
534 | r = PTR_ERR(pmd->data_sm); | |
0fa5b17b | 535 | goto bad_cleanup_tm; |
991d9fa0 JT |
536 | } |
537 | ||
d6332814 | 538 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
991d9fa0 | 539 | if (!pmd->nb_tm) { |
0fa5b17b | 540 | DMERR("could not create non-blocking clone tm"); |
991d9fa0 | 541 | r = -ENOMEM; |
0fa5b17b | 542 | goto bad_cleanup_data_sm; |
991d9fa0 JT |
543 | } |
544 | ||
41675aea | 545 | __setup_btree_details(pmd); |
991d9fa0 | 546 | |
9cb6653f JT |
547 | r = dm_btree_empty(&pmd->info, &pmd->root); |
548 | if (r < 0) | |
0fa5b17b | 549 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
550 | |
551 | r = dm_btree_empty(&pmd->details_info, &pmd->details_root); | |
552 | if (r < 0) { | |
553 | DMERR("couldn't create devices root"); | |
0fa5b17b | 554 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
555 | } |
556 | ||
557 | r = __write_initial_superblock(pmd); | |
558 | if (r) | |
0fa5b17b | 559 | goto bad_cleanup_nb_tm; |
9cb6653f | 560 | |
991d9fa0 JT |
561 | return 0; |
562 | ||
0fa5b17b JT |
563 | bad_cleanup_nb_tm: |
564 | dm_tm_destroy(pmd->nb_tm); | |
565 | bad_cleanup_data_sm: | |
d6332814 | 566 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 567 | bad_cleanup_tm: |
d6332814 JT |
568 | dm_tm_destroy(pmd->tm); |
569 | dm_sm_destroy(pmd->metadata_sm); | |
991d9fa0 JT |
570 | |
571 | return r; | |
572 | } | |
573 | ||
d73ec525 MS |
574 | static int __check_incompat_features(struct thin_disk_superblock *disk_super, |
575 | struct dm_pool_metadata *pmd) | |
576 | { | |
577 | uint32_t features; | |
578 | ||
579 | features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP; | |
580 | if (features) { | |
581 | DMERR("could not access metadata due to unsupported optional features (%lx).", | |
582 | (unsigned long)features); | |
583 | return -EINVAL; | |
584 | } | |
585 | ||
586 | /* | |
587 | * Check for read-only metadata to skip the following RDWR checks. | |
588 | */ | |
589 | if (get_disk_ro(pmd->bdev->bd_disk)) | |
590 | return 0; | |
591 | ||
592 | features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP; | |
593 | if (features) { | |
594 | DMERR("could not access metadata RDWR due to unsupported optional features (%lx).", | |
595 | (unsigned long)features); | |
596 | return -EINVAL; | |
597 | } | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
e4d2205c JT |
602 | static int __open_metadata(struct dm_pool_metadata *pmd) |
603 | { | |
604 | int r; | |
605 | struct dm_block *sblock; | |
606 | struct thin_disk_superblock *disk_super; | |
607 | ||
608 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
609 | &sb_validator, &sblock); | |
610 | if (r < 0) { | |
611 | DMERR("couldn't read superblock"); | |
612 | return r; | |
613 | } | |
614 | ||
615 | disk_super = dm_block_data(sblock); | |
d73ec525 | 616 | |
9aec8629 MS |
617 | /* Verify the data block size hasn't changed */ |
618 | if (le32_to_cpu(disk_super->data_block_size) != pmd->data_block_size) { | |
619 | DMERR("changing the data block size (from %u to %llu) is not supported", | |
620 | le32_to_cpu(disk_super->data_block_size), | |
621 | (unsigned long long)pmd->data_block_size); | |
622 | r = -EINVAL; | |
623 | goto bad_unlock_sblock; | |
624 | } | |
625 | ||
d73ec525 | 626 | r = __check_incompat_features(disk_super, pmd); |
0fa5b17b JT |
627 | if (r < 0) |
628 | goto bad_unlock_sblock; | |
d73ec525 | 629 | |
e4d2205c JT |
630 | r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
631 | disk_super->metadata_space_map_root, | |
632 | sizeof(disk_super->metadata_space_map_root), | |
633 | &pmd->tm, &pmd->metadata_sm); | |
634 | if (r < 0) { | |
635 | DMERR("tm_open_with_sm failed"); | |
0fa5b17b | 636 | goto bad_unlock_sblock; |
e4d2205c JT |
637 | } |
638 | ||
639 | pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root, | |
640 | sizeof(disk_super->data_space_map_root)); | |
641 | if (IS_ERR(pmd->data_sm)) { | |
642 | DMERR("sm_disk_open failed"); | |
e4d2205c | 643 | r = PTR_ERR(pmd->data_sm); |
0fa5b17b | 644 | goto bad_cleanup_tm; |
e4d2205c JT |
645 | } |
646 | ||
e4d2205c JT |
647 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
648 | if (!pmd->nb_tm) { | |
0fa5b17b | 649 | DMERR("could not create non-blocking clone tm"); |
e4d2205c | 650 | r = -ENOMEM; |
0fa5b17b | 651 | goto bad_cleanup_data_sm; |
e4d2205c JT |
652 | } |
653 | ||
654 | __setup_btree_details(pmd); | |
4c7da06f MP |
655 | dm_bm_unlock(sblock); |
656 | ||
657 | return 0; | |
e4d2205c | 658 | |
0fa5b17b | 659 | bad_cleanup_data_sm: |
e4d2205c | 660 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 661 | bad_cleanup_tm: |
e4d2205c JT |
662 | dm_tm_destroy(pmd->tm); |
663 | dm_sm_destroy(pmd->metadata_sm); | |
0fa5b17b JT |
664 | bad_unlock_sblock: |
665 | dm_bm_unlock(sblock); | |
e4d2205c JT |
666 | |
667 | return r; | |
668 | } | |
669 | ||
66b1edc0 | 670 | static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device) |
e4d2205c | 671 | { |
8801e069 | 672 | int r, unformatted; |
237074c0 | 673 | |
8801e069 | 674 | r = __superblock_all_zeroes(pmd->bm, &unformatted); |
237074c0 JT |
675 | if (r) |
676 | return r; | |
677 | ||
8801e069 | 678 | if (unformatted) |
66b1edc0 JT |
679 | return format_device ? __format_metadata(pmd) : -EPERM; |
680 | ||
681 | return __open_metadata(pmd); | |
e4d2205c JT |
682 | } |
683 | ||
66b1edc0 | 684 | static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device) |
332627db JT |
685 | { |
686 | int r; | |
687 | ||
7d48935e | 688 | pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT, |
332627db JT |
689 | THIN_METADATA_CACHE_SIZE, |
690 | THIN_MAX_CONCURRENT_LOCKS); | |
691 | if (IS_ERR(pmd->bm)) { | |
692 | DMERR("could not create block manager"); | |
693 | return PTR_ERR(pmd->bm); | |
694 | } | |
695 | ||
66b1edc0 | 696 | r = __open_or_format_metadata(pmd, format_device); |
332627db JT |
697 | if (r) |
698 | dm_block_manager_destroy(pmd->bm); | |
699 | ||
700 | return r; | |
701 | } | |
702 | ||
f9dd9352 JT |
703 | static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd) |
704 | { | |
705 | dm_sm_destroy(pmd->data_sm); | |
706 | dm_sm_destroy(pmd->metadata_sm); | |
707 | dm_tm_destroy(pmd->nb_tm); | |
708 | dm_tm_destroy(pmd->tm); | |
709 | dm_block_manager_destroy(pmd->bm); | |
710 | } | |
711 | ||
991d9fa0 JT |
712 | static int __begin_transaction(struct dm_pool_metadata *pmd) |
713 | { | |
714 | int r; | |
991d9fa0 JT |
715 | struct thin_disk_superblock *disk_super; |
716 | struct dm_block *sblock; | |
717 | ||
991d9fa0 JT |
718 | /* |
719 | * We re-read the superblock every time. Shouldn't need to do this | |
720 | * really. | |
721 | */ | |
722 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
723 | &sb_validator, &sblock); | |
724 | if (r) | |
725 | return r; | |
726 | ||
727 | disk_super = dm_block_data(sblock); | |
728 | pmd->time = le32_to_cpu(disk_super->time); | |
729 | pmd->root = le64_to_cpu(disk_super->data_mapping_root); | |
730 | pmd->details_root = le64_to_cpu(disk_super->device_details_root); | |
731 | pmd->trans_id = le64_to_cpu(disk_super->trans_id); | |
732 | pmd->flags = le32_to_cpu(disk_super->flags); | |
733 | pmd->data_block_size = le32_to_cpu(disk_super->data_block_size); | |
734 | ||
991d9fa0 | 735 | dm_bm_unlock(sblock); |
d73ec525 | 736 | return 0; |
991d9fa0 JT |
737 | } |
738 | ||
739 | static int __write_changed_details(struct dm_pool_metadata *pmd) | |
740 | { | |
741 | int r; | |
742 | struct dm_thin_device *td, *tmp; | |
743 | struct disk_device_details details; | |
744 | uint64_t key; | |
745 | ||
746 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
747 | if (!td->changed) | |
748 | continue; | |
749 | ||
750 | key = td->id; | |
751 | ||
752 | details.mapped_blocks = cpu_to_le64(td->mapped_blocks); | |
753 | details.transaction_id = cpu_to_le64(td->transaction_id); | |
754 | details.creation_time = cpu_to_le32(td->creation_time); | |
755 | details.snapshotted_time = cpu_to_le32(td->snapshotted_time); | |
756 | __dm_bless_for_disk(&details); | |
757 | ||
758 | r = dm_btree_insert(&pmd->details_info, pmd->details_root, | |
759 | &key, &details, &pmd->details_root); | |
760 | if (r) | |
761 | return r; | |
762 | ||
763 | if (td->open_count) | |
764 | td->changed = 0; | |
765 | else { | |
766 | list_del(&td->list); | |
767 | kfree(td); | |
768 | } | |
991d9fa0 JT |
769 | } |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
774 | static int __commit_transaction(struct dm_pool_metadata *pmd) | |
775 | { | |
991d9fa0 JT |
776 | int r; |
777 | size_t metadata_len, data_len; | |
778 | struct thin_disk_superblock *disk_super; | |
779 | struct dm_block *sblock; | |
780 | ||
781 | /* | |
782 | * We need to know if the thin_disk_superblock exceeds a 512-byte sector. | |
783 | */ | |
784 | BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512); | |
785 | ||
786 | r = __write_changed_details(pmd); | |
787 | if (r < 0) | |
d973ac19 | 788 | return r; |
991d9fa0 | 789 | |
991d9fa0 JT |
790 | r = dm_sm_commit(pmd->data_sm); |
791 | if (r < 0) | |
d973ac19 | 792 | return r; |
991d9fa0 JT |
793 | |
794 | r = dm_tm_pre_commit(pmd->tm); | |
795 | if (r < 0) | |
d973ac19 | 796 | return r; |
991d9fa0 JT |
797 | |
798 | r = dm_sm_root_size(pmd->metadata_sm, &metadata_len); | |
799 | if (r < 0) | |
d973ac19 | 800 | return r; |
991d9fa0 | 801 | |
fef838cc | 802 | r = dm_sm_root_size(pmd->data_sm, &data_len); |
991d9fa0 | 803 | if (r < 0) |
d973ac19 | 804 | return r; |
991d9fa0 | 805 | |
5a32083d JT |
806 | r = save_sm_roots(pmd); |
807 | if (r < 0) | |
808 | return r; | |
809 | ||
25971192 | 810 | r = superblock_lock(pmd, &sblock); |
991d9fa0 | 811 | if (r) |
d973ac19 | 812 | return r; |
991d9fa0 JT |
813 | |
814 | disk_super = dm_block_data(sblock); | |
815 | disk_super->time = cpu_to_le32(pmd->time); | |
816 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
817 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
818 | disk_super->trans_id = cpu_to_le64(pmd->trans_id); | |
819 | disk_super->flags = cpu_to_le32(pmd->flags); | |
820 | ||
5a32083d | 821 | copy_sm_roots(pmd, disk_super); |
991d9fa0 | 822 | |
eb04cf63 | 823 | return dm_tm_commit(pmd->tm, sblock); |
991d9fa0 JT |
824 | } |
825 | ||
826 | struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, | |
66b1edc0 JT |
827 | sector_t data_block_size, |
828 | bool format_device) | |
991d9fa0 JT |
829 | { |
830 | int r; | |
991d9fa0 | 831 | struct dm_pool_metadata *pmd; |
991d9fa0 JT |
832 | |
833 | pmd = kmalloc(sizeof(*pmd), GFP_KERNEL); | |
834 | if (!pmd) { | |
835 | DMERR("could not allocate metadata struct"); | |
836 | return ERR_PTR(-ENOMEM); | |
837 | } | |
838 | ||
6a0ebd31 JT |
839 | init_rwsem(&pmd->root_lock); |
840 | pmd->time = 0; | |
841 | INIT_LIST_HEAD(&pmd->thin_devices); | |
da105ed5 | 842 | pmd->fail_io = false; |
332627db | 843 | pmd->bdev = bdev; |
9cb6653f | 844 | pmd->data_block_size = data_block_size; |
991d9fa0 | 845 | |
66b1edc0 | 846 | r = __create_persistent_data_objects(pmd, format_device); |
991d9fa0 | 847 | if (r) { |
991d9fa0 JT |
848 | kfree(pmd); |
849 | return ERR_PTR(r); | |
850 | } | |
991d9fa0 | 851 | |
270938ba JT |
852 | r = __begin_transaction(pmd); |
853 | if (r < 0) { | |
854 | if (dm_pool_metadata_close(pmd) < 0) | |
855 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); | |
856 | return ERR_PTR(r); | |
991d9fa0 JT |
857 | } |
858 | ||
859 | return pmd; | |
991d9fa0 JT |
860 | } |
861 | ||
862 | int dm_pool_metadata_close(struct dm_pool_metadata *pmd) | |
863 | { | |
864 | int r; | |
865 | unsigned open_devices = 0; | |
866 | struct dm_thin_device *td, *tmp; | |
867 | ||
868 | down_read(&pmd->root_lock); | |
869 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
870 | if (td->open_count) | |
871 | open_devices++; | |
872 | else { | |
873 | list_del(&td->list); | |
874 | kfree(td); | |
875 | } | |
876 | } | |
877 | up_read(&pmd->root_lock); | |
878 | ||
879 | if (open_devices) { | |
880 | DMERR("attempt to close pmd when %u device(s) are still open", | |
881 | open_devices); | |
882 | return -EBUSY; | |
883 | } | |
884 | ||
49f154c7 | 885 | if (!dm_bm_is_read_only(pmd->bm) && !pmd->fail_io) { |
12ba58af JT |
886 | r = __commit_transaction(pmd); |
887 | if (r < 0) | |
888 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
889 | __func__, r); | |
890 | } | |
991d9fa0 | 891 | |
da105ed5 JT |
892 | if (!pmd->fail_io) |
893 | __destroy_persistent_data_objects(pmd); | |
991d9fa0 | 894 | |
da105ed5 | 895 | kfree(pmd); |
991d9fa0 JT |
896 | return 0; |
897 | } | |
898 | ||
1f3db25d MS |
899 | /* |
900 | * __open_device: Returns @td corresponding to device with id @dev, | |
901 | * creating it if @create is set and incrementing @td->open_count. | |
902 | * On failure, @td is undefined. | |
903 | */ | |
991d9fa0 JT |
904 | static int __open_device(struct dm_pool_metadata *pmd, |
905 | dm_thin_id dev, int create, | |
906 | struct dm_thin_device **td) | |
907 | { | |
908 | int r, changed = 0; | |
909 | struct dm_thin_device *td2; | |
910 | uint64_t key = dev; | |
911 | struct disk_device_details details_le; | |
912 | ||
913 | /* | |
1f3db25d | 914 | * If the device is already open, return it. |
991d9fa0 JT |
915 | */ |
916 | list_for_each_entry(td2, &pmd->thin_devices, list) | |
917 | if (td2->id == dev) { | |
1f3db25d MS |
918 | /* |
919 | * May not create an already-open device. | |
920 | */ | |
921 | if (create) | |
922 | return -EEXIST; | |
923 | ||
991d9fa0 JT |
924 | td2->open_count++; |
925 | *td = td2; | |
926 | return 0; | |
927 | } | |
928 | ||
929 | /* | |
930 | * Check the device exists. | |
931 | */ | |
932 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
933 | &key, &details_le); | |
934 | if (r) { | |
935 | if (r != -ENODATA || !create) | |
936 | return r; | |
937 | ||
1f3db25d MS |
938 | /* |
939 | * Create new device. | |
940 | */ | |
991d9fa0 JT |
941 | changed = 1; |
942 | details_le.mapped_blocks = 0; | |
943 | details_le.transaction_id = cpu_to_le64(pmd->trans_id); | |
944 | details_le.creation_time = cpu_to_le32(pmd->time); | |
945 | details_le.snapshotted_time = cpu_to_le32(pmd->time); | |
946 | } | |
947 | ||
948 | *td = kmalloc(sizeof(**td), GFP_NOIO); | |
949 | if (!*td) | |
950 | return -ENOMEM; | |
951 | ||
952 | (*td)->pmd = pmd; | |
953 | (*td)->id = dev; | |
954 | (*td)->open_count = 1; | |
955 | (*td)->changed = changed; | |
da105ed5 | 956 | (*td)->aborted_with_changes = false; |
991d9fa0 JT |
957 | (*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks); |
958 | (*td)->transaction_id = le64_to_cpu(details_le.transaction_id); | |
959 | (*td)->creation_time = le32_to_cpu(details_le.creation_time); | |
960 | (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time); | |
961 | ||
962 | list_add(&(*td)->list, &pmd->thin_devices); | |
963 | ||
964 | return 0; | |
965 | } | |
966 | ||
967 | static void __close_device(struct dm_thin_device *td) | |
968 | { | |
969 | --td->open_count; | |
970 | } | |
971 | ||
972 | static int __create_thin(struct dm_pool_metadata *pmd, | |
973 | dm_thin_id dev) | |
974 | { | |
975 | int r; | |
976 | dm_block_t dev_root; | |
977 | uint64_t key = dev; | |
978 | struct disk_device_details details_le; | |
979 | struct dm_thin_device *td; | |
980 | __le64 value; | |
981 | ||
982 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
983 | &key, &details_le); | |
984 | if (!r) | |
985 | return -EEXIST; | |
986 | ||
987 | /* | |
988 | * Create an empty btree for the mappings. | |
989 | */ | |
990 | r = dm_btree_empty(&pmd->bl_info, &dev_root); | |
991 | if (r) | |
992 | return r; | |
993 | ||
994 | /* | |
995 | * Insert it into the main mapping tree. | |
996 | */ | |
997 | value = cpu_to_le64(dev_root); | |
998 | __dm_bless_for_disk(&value); | |
999 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1000 | if (r) { | |
1001 | dm_btree_del(&pmd->bl_info, dev_root); | |
1002 | return r; | |
1003 | } | |
1004 | ||
1005 | r = __open_device(pmd, dev, 1, &td); | |
1006 | if (r) { | |
991d9fa0 JT |
1007 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1008 | dm_btree_del(&pmd->bl_info, dev_root); | |
1009 | return r; | |
1010 | } | |
991d9fa0 JT |
1011 | __close_device(td); |
1012 | ||
1013 | return r; | |
1014 | } | |
1015 | ||
1016 | int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1017 | { | |
da105ed5 | 1018 | int r = -EINVAL; |
991d9fa0 JT |
1019 | |
1020 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1021 | if (!pmd->fail_io) |
1022 | r = __create_thin(pmd, dev); | |
991d9fa0 JT |
1023 | up_write(&pmd->root_lock); |
1024 | ||
1025 | return r; | |
1026 | } | |
1027 | ||
1028 | static int __set_snapshot_details(struct dm_pool_metadata *pmd, | |
1029 | struct dm_thin_device *snap, | |
1030 | dm_thin_id origin, uint32_t time) | |
1031 | { | |
1032 | int r; | |
1033 | struct dm_thin_device *td; | |
1034 | ||
1035 | r = __open_device(pmd, origin, 0, &td); | |
1036 | if (r) | |
1037 | return r; | |
1038 | ||
1039 | td->changed = 1; | |
1040 | td->snapshotted_time = time; | |
1041 | ||
1042 | snap->mapped_blocks = td->mapped_blocks; | |
1043 | snap->snapshotted_time = time; | |
1044 | __close_device(td); | |
1045 | ||
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | static int __create_snap(struct dm_pool_metadata *pmd, | |
1050 | dm_thin_id dev, dm_thin_id origin) | |
1051 | { | |
1052 | int r; | |
1053 | dm_block_t origin_root; | |
1054 | uint64_t key = origin, dev_key = dev; | |
1055 | struct dm_thin_device *td; | |
1056 | struct disk_device_details details_le; | |
1057 | __le64 value; | |
1058 | ||
1059 | /* check this device is unused */ | |
1060 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
1061 | &dev_key, &details_le); | |
1062 | if (!r) | |
1063 | return -EEXIST; | |
1064 | ||
1065 | /* find the mapping tree for the origin */ | |
1066 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value); | |
1067 | if (r) | |
1068 | return r; | |
1069 | origin_root = le64_to_cpu(value); | |
1070 | ||
1071 | /* clone the origin, an inc will do */ | |
1072 | dm_tm_inc(pmd->tm, origin_root); | |
1073 | ||
1074 | /* insert into the main mapping tree */ | |
1075 | value = cpu_to_le64(origin_root); | |
1076 | __dm_bless_for_disk(&value); | |
1077 | key = dev; | |
1078 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1079 | if (r) { | |
1080 | dm_tm_dec(pmd->tm, origin_root); | |
1081 | return r; | |
1082 | } | |
1083 | ||
1084 | pmd->time++; | |
1085 | ||
1086 | r = __open_device(pmd, dev, 1, &td); | |
1087 | if (r) | |
1088 | goto bad; | |
1089 | ||
1090 | r = __set_snapshot_details(pmd, td, origin, pmd->time); | |
1f3db25d MS |
1091 | __close_device(td); |
1092 | ||
991d9fa0 JT |
1093 | if (r) |
1094 | goto bad; | |
1095 | ||
991d9fa0 JT |
1096 | return 0; |
1097 | ||
1098 | bad: | |
991d9fa0 JT |
1099 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1100 | dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1101 | &key, &pmd->details_root); | |
1102 | return r; | |
1103 | } | |
1104 | ||
1105 | int dm_pool_create_snap(struct dm_pool_metadata *pmd, | |
1106 | dm_thin_id dev, | |
1107 | dm_thin_id origin) | |
1108 | { | |
da105ed5 | 1109 | int r = -EINVAL; |
991d9fa0 JT |
1110 | |
1111 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1112 | if (!pmd->fail_io) |
1113 | r = __create_snap(pmd, dev, origin); | |
991d9fa0 JT |
1114 | up_write(&pmd->root_lock); |
1115 | ||
1116 | return r; | |
1117 | } | |
1118 | ||
1119 | static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1120 | { | |
1121 | int r; | |
1122 | uint64_t key = dev; | |
1123 | struct dm_thin_device *td; | |
1124 | ||
1125 | /* TODO: failure should mark the transaction invalid */ | |
1126 | r = __open_device(pmd, dev, 0, &td); | |
1127 | if (r) | |
1128 | return r; | |
1129 | ||
1130 | if (td->open_count > 1) { | |
1131 | __close_device(td); | |
1132 | return -EBUSY; | |
1133 | } | |
1134 | ||
1135 | list_del(&td->list); | |
1136 | kfree(td); | |
1137 | r = dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1138 | &key, &pmd->details_root); | |
1139 | if (r) | |
1140 | return r; | |
1141 | ||
1142 | r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); | |
1143 | if (r) | |
1144 | return r; | |
1145 | ||
991d9fa0 JT |
1146 | return 0; |
1147 | } | |
1148 | ||
1149 | int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, | |
1150 | dm_thin_id dev) | |
1151 | { | |
da105ed5 | 1152 | int r = -EINVAL; |
991d9fa0 JT |
1153 | |
1154 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1155 | if (!pmd->fail_io) |
1156 | r = __delete_device(pmd, dev); | |
991d9fa0 JT |
1157 | up_write(&pmd->root_lock); |
1158 | ||
1159 | return r; | |
1160 | } | |
1161 | ||
1162 | int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1163 | uint64_t current_id, | |
1164 | uint64_t new_id) | |
1165 | { | |
da105ed5 JT |
1166 | int r = -EINVAL; |
1167 | ||
991d9fa0 | 1168 | down_write(&pmd->root_lock); |
da105ed5 JT |
1169 | |
1170 | if (pmd->fail_io) | |
1171 | goto out; | |
1172 | ||
991d9fa0 | 1173 | if (pmd->trans_id != current_id) { |
991d9fa0 | 1174 | DMERR("mismatched transaction id"); |
da105ed5 | 1175 | goto out; |
991d9fa0 JT |
1176 | } |
1177 | ||
1178 | pmd->trans_id = new_id; | |
da105ed5 JT |
1179 | r = 0; |
1180 | ||
1181 | out: | |
991d9fa0 JT |
1182 | up_write(&pmd->root_lock); |
1183 | ||
da105ed5 | 1184 | return r; |
991d9fa0 JT |
1185 | } |
1186 | ||
1187 | int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1188 | uint64_t *result) | |
1189 | { | |
da105ed5 JT |
1190 | int r = -EINVAL; |
1191 | ||
991d9fa0 | 1192 | down_read(&pmd->root_lock); |
da105ed5 JT |
1193 | if (!pmd->fail_io) { |
1194 | *result = pmd->trans_id; | |
1195 | r = 0; | |
1196 | } | |
991d9fa0 JT |
1197 | up_read(&pmd->root_lock); |
1198 | ||
da105ed5 | 1199 | return r; |
991d9fa0 JT |
1200 | } |
1201 | ||
cc8394d8 JT |
1202 | static int __reserve_metadata_snap(struct dm_pool_metadata *pmd) |
1203 | { | |
1204 | int r, inc; | |
1205 | struct thin_disk_superblock *disk_super; | |
1206 | struct dm_block *copy, *sblock; | |
1207 | dm_block_t held_root; | |
1208 | ||
1209 | /* | |
1210 | * Copy the superblock. | |
1211 | */ | |
1212 | dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION); | |
1213 | r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION, | |
1214 | &sb_validator, ©, &inc); | |
1215 | if (r) | |
1216 | return r; | |
1217 | ||
1218 | BUG_ON(!inc); | |
1219 | ||
1220 | held_root = dm_block_location(copy); | |
1221 | disk_super = dm_block_data(copy); | |
1222 | ||
1223 | if (le64_to_cpu(disk_super->held_root)) { | |
1224 | DMWARN("Pool metadata snapshot already exists: release this before taking another."); | |
1225 | ||
1226 | dm_tm_dec(pmd->tm, held_root); | |
1227 | dm_tm_unlock(pmd->tm, copy); | |
cc8394d8 JT |
1228 | return -EBUSY; |
1229 | } | |
1230 | ||
1231 | /* | |
1232 | * Wipe the spacemap since we're not publishing this. | |
1233 | */ | |
1234 | memset(&disk_super->data_space_map_root, 0, | |
1235 | sizeof(disk_super->data_space_map_root)); | |
1236 | memset(&disk_super->metadata_space_map_root, 0, | |
1237 | sizeof(disk_super->metadata_space_map_root)); | |
1238 | ||
1239 | /* | |
1240 | * Increment the data structures that need to be preserved. | |
1241 | */ | |
1242 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root)); | |
1243 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root)); | |
1244 | dm_tm_unlock(pmd->tm, copy); | |
1245 | ||
1246 | /* | |
1247 | * Write the held root into the superblock. | |
1248 | */ | |
25971192 | 1249 | r = superblock_lock(pmd, &sblock); |
cc8394d8 JT |
1250 | if (r) { |
1251 | dm_tm_dec(pmd->tm, held_root); | |
cc8394d8 JT |
1252 | return r; |
1253 | } | |
1254 | ||
1255 | disk_super = dm_block_data(sblock); | |
1256 | disk_super->held_root = cpu_to_le64(held_root); | |
1257 | dm_bm_unlock(sblock); | |
cc8394d8 JT |
1258 | return 0; |
1259 | } | |
1260 | ||
1261 | int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd) | |
1262 | { | |
da105ed5 | 1263 | int r = -EINVAL; |
cc8394d8 JT |
1264 | |
1265 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1266 | if (!pmd->fail_io) |
1267 | r = __reserve_metadata_snap(pmd); | |
cc8394d8 JT |
1268 | up_write(&pmd->root_lock); |
1269 | ||
1270 | return r; | |
1271 | } | |
1272 | ||
1273 | static int __release_metadata_snap(struct dm_pool_metadata *pmd) | |
991d9fa0 JT |
1274 | { |
1275 | int r; | |
1276 | struct thin_disk_superblock *disk_super; | |
cc8394d8 JT |
1277 | struct dm_block *sblock, *copy; |
1278 | dm_block_t held_root; | |
991d9fa0 | 1279 | |
25971192 | 1280 | r = superblock_lock(pmd, &sblock); |
991d9fa0 JT |
1281 | if (r) |
1282 | return r; | |
1283 | ||
cc8394d8 JT |
1284 | disk_super = dm_block_data(sblock); |
1285 | held_root = le64_to_cpu(disk_super->held_root); | |
1286 | disk_super->held_root = cpu_to_le64(0); | |
cc8394d8 JT |
1287 | |
1288 | dm_bm_unlock(sblock); | |
1289 | ||
1290 | if (!held_root) { | |
1291 | DMWARN("No pool metadata snapshot found: nothing to release."); | |
1292 | return -EINVAL; | |
1293 | } | |
1294 | ||
1295 | r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, ©); | |
1296 | if (r) | |
1297 | return r; | |
1298 | ||
1299 | disk_super = dm_block_data(copy); | |
7f518ad0 JT |
1300 | dm_btree_del(&pmd->info, le64_to_cpu(disk_super->data_mapping_root)); |
1301 | dm_btree_del(&pmd->details_info, le64_to_cpu(disk_super->device_details_root)); | |
cc8394d8 JT |
1302 | dm_sm_dec_block(pmd->metadata_sm, held_root); |
1303 | ||
4c7da06f MP |
1304 | dm_tm_unlock(pmd->tm, copy); |
1305 | ||
1306 | return 0; | |
cc8394d8 JT |
1307 | } |
1308 | ||
1309 | int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd) | |
1310 | { | |
da105ed5 | 1311 | int r = -EINVAL; |
cc8394d8 JT |
1312 | |
1313 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1314 | if (!pmd->fail_io) |
1315 | r = __release_metadata_snap(pmd); | |
cc8394d8 JT |
1316 | up_write(&pmd->root_lock); |
1317 | ||
1318 | return r; | |
1319 | } | |
1320 | ||
1321 | static int __get_metadata_snap(struct dm_pool_metadata *pmd, | |
1322 | dm_block_t *result) | |
1323 | { | |
1324 | int r; | |
1325 | struct thin_disk_superblock *disk_super; | |
1326 | struct dm_block *sblock; | |
1327 | ||
1328 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
1329 | &sb_validator, &sblock); | |
1330 | if (r) | |
1331 | return r; | |
1332 | ||
991d9fa0 JT |
1333 | disk_super = dm_block_data(sblock); |
1334 | *result = le64_to_cpu(disk_super->held_root); | |
1335 | ||
4c7da06f MP |
1336 | dm_bm_unlock(sblock); |
1337 | ||
1338 | return 0; | |
991d9fa0 JT |
1339 | } |
1340 | ||
cc8394d8 JT |
1341 | int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd, |
1342 | dm_block_t *result) | |
991d9fa0 | 1343 | { |
da105ed5 | 1344 | int r = -EINVAL; |
991d9fa0 JT |
1345 | |
1346 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1347 | if (!pmd->fail_io) |
1348 | r = __get_metadata_snap(pmd, result); | |
991d9fa0 JT |
1349 | up_read(&pmd->root_lock); |
1350 | ||
1351 | return r; | |
1352 | } | |
1353 | ||
1354 | int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, | |
1355 | struct dm_thin_device **td) | |
1356 | { | |
da105ed5 | 1357 | int r = -EINVAL; |
991d9fa0 JT |
1358 | |
1359 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1360 | if (!pmd->fail_io) |
1361 | r = __open_device(pmd, dev, 0, td); | |
991d9fa0 JT |
1362 | up_write(&pmd->root_lock); |
1363 | ||
1364 | return r; | |
1365 | } | |
1366 | ||
1367 | int dm_pool_close_thin_device(struct dm_thin_device *td) | |
1368 | { | |
1369 | down_write(&td->pmd->root_lock); | |
1370 | __close_device(td); | |
1371 | up_write(&td->pmd->root_lock); | |
1372 | ||
1373 | return 0; | |
1374 | } | |
1375 | ||
1376 | dm_thin_id dm_thin_dev_id(struct dm_thin_device *td) | |
1377 | { | |
1378 | return td->id; | |
1379 | } | |
1380 | ||
19fa1a67 JT |
1381 | /* |
1382 | * Check whether @time (of block creation) is older than @td's last snapshot. | |
1383 | * If so then the associated block is shared with the last snapshot device. | |
1384 | * Any block on a device created *after* the device last got snapshotted is | |
1385 | * necessarily not shared. | |
1386 | */ | |
17b7d63f | 1387 | static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time) |
991d9fa0 JT |
1388 | { |
1389 | return td->snapshotted_time > time; | |
1390 | } | |
1391 | ||
1392 | int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, | |
e5cfc69a | 1393 | int can_issue_io, struct dm_thin_lookup_result *result) |
991d9fa0 | 1394 | { |
e5cfc69a | 1395 | int r; |
991d9fa0 JT |
1396 | __le64 value; |
1397 | struct dm_pool_metadata *pmd = td->pmd; | |
1398 | dm_block_t keys[2] = { td->id, block }; | |
da105ed5 | 1399 | struct dm_btree_info *info; |
991d9fa0 | 1400 | |
e5cfc69a | 1401 | down_read(&pmd->root_lock); |
b1f11aff JT |
1402 | if (pmd->fail_io) { |
1403 | up_read(&pmd->root_lock); | |
1404 | return -EINVAL; | |
1405 | } | |
da105ed5 | 1406 | |
e5cfc69a JT |
1407 | if (can_issue_io) { |
1408 | info = &pmd->info; | |
1409 | } else | |
1410 | info = &pmd->nb_info; | |
da105ed5 | 1411 | |
e5cfc69a | 1412 | r = dm_btree_lookup(info, pmd->root, keys, &value); |
991d9fa0 | 1413 | if (!r) { |
e5cfc69a | 1414 | uint64_t block_time = 0; |
991d9fa0 JT |
1415 | dm_block_t exception_block; |
1416 | uint32_t exception_time; | |
e5cfc69a JT |
1417 | |
1418 | block_time = le64_to_cpu(value); | |
991d9fa0 JT |
1419 | unpack_block_time(block_time, &exception_block, |
1420 | &exception_time); | |
1421 | result->block = exception_block; | |
1422 | result->shared = __snapshotted_since(td, exception_time); | |
1423 | } | |
1424 | ||
e5cfc69a | 1425 | up_read(&pmd->root_lock); |
991d9fa0 JT |
1426 | return r; |
1427 | } | |
1428 | ||
a5d895a9 JT |
1429 | /* FIXME: write a more efficient one in btree */ |
1430 | int dm_thin_find_mapped_range(struct dm_thin_device *td, | |
1431 | dm_block_t begin, dm_block_t end, | |
1432 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
1433 | dm_block_t *pool_begin, bool *maybe_shared) | |
1434 | { | |
1435 | int r; | |
1436 | dm_block_t pool_end; | |
1437 | struct dm_thin_lookup_result lookup; | |
1438 | ||
1439 | if (end < begin) | |
1440 | return -ENODATA; | |
1441 | ||
1442 | /* | |
1443 | * Find first mapped block. | |
1444 | */ | |
1445 | while (begin < end) { | |
1446 | r = dm_thin_find_block(td, begin, true, &lookup); | |
1447 | if (r) { | |
1448 | if (r != -ENODATA) | |
1449 | return r; | |
1450 | } else | |
1451 | break; | |
1452 | ||
1453 | begin++; | |
1454 | } | |
1455 | ||
1456 | if (begin == end) | |
1457 | return -ENODATA; | |
1458 | ||
1459 | *thin_begin = begin; | |
1460 | *pool_begin = lookup.block; | |
1461 | *maybe_shared = lookup.shared; | |
1462 | ||
1463 | begin++; | |
1464 | pool_end = *pool_begin + 1; | |
1465 | while (begin != end) { | |
1466 | r = dm_thin_find_block(td, begin, true, &lookup); | |
1467 | if (r) { | |
1468 | if (r == -ENODATA) | |
1469 | break; | |
1470 | else | |
1471 | return r; | |
1472 | } | |
1473 | ||
1474 | if ((lookup.block != pool_end) || | |
1475 | (lookup.shared != *maybe_shared)) | |
1476 | break; | |
1477 | ||
1478 | pool_end++; | |
1479 | begin++; | |
1480 | } | |
1481 | ||
1482 | *thin_end = begin; | |
1483 | return 0; | |
1484 | } | |
1485 | ||
991d9fa0 JT |
1486 | static int __insert(struct dm_thin_device *td, dm_block_t block, |
1487 | dm_block_t data_block) | |
1488 | { | |
1489 | int r, inserted; | |
1490 | __le64 value; | |
1491 | struct dm_pool_metadata *pmd = td->pmd; | |
1492 | dm_block_t keys[2] = { td->id, block }; | |
1493 | ||
991d9fa0 JT |
1494 | value = cpu_to_le64(pack_block_time(data_block, pmd->time)); |
1495 | __dm_bless_for_disk(&value); | |
1496 | ||
1497 | r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value, | |
1498 | &pmd->root, &inserted); | |
1499 | if (r) | |
1500 | return r; | |
1501 | ||
40db5a53 JT |
1502 | td->changed = 1; |
1503 | if (inserted) | |
991d9fa0 | 1504 | td->mapped_blocks++; |
991d9fa0 JT |
1505 | |
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, | |
1510 | dm_block_t data_block) | |
1511 | { | |
da105ed5 | 1512 | int r = -EINVAL; |
991d9fa0 JT |
1513 | |
1514 | down_write(&td->pmd->root_lock); | |
da105ed5 JT |
1515 | if (!td->pmd->fail_io) |
1516 | r = __insert(td, block, data_block); | |
991d9fa0 JT |
1517 | up_write(&td->pmd->root_lock); |
1518 | ||
1519 | return r; | |
1520 | } | |
1521 | ||
1522 | static int __remove(struct dm_thin_device *td, dm_block_t block) | |
1523 | { | |
1524 | int r; | |
1525 | struct dm_pool_metadata *pmd = td->pmd; | |
1526 | dm_block_t keys[2] = { td->id, block }; | |
1527 | ||
1528 | r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root); | |
1529 | if (r) | |
1530 | return r; | |
1531 | ||
af63bcb8 JT |
1532 | td->mapped_blocks--; |
1533 | td->changed = 1; | |
991d9fa0 JT |
1534 | |
1535 | return 0; | |
1536 | } | |
1537 | ||
6550f075 JT |
1538 | static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end) |
1539 | { | |
1540 | int r; | |
1541 | unsigned count; | |
1542 | struct dm_pool_metadata *pmd = td->pmd; | |
1543 | dm_block_t keys[1] = { td->id }; | |
1544 | __le64 value; | |
1545 | dm_block_t mapping_root; | |
1546 | ||
1547 | /* | |
1548 | * Find the mapping tree | |
1549 | */ | |
1550 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value); | |
1551 | if (r) | |
1552 | return r; | |
1553 | ||
1554 | /* | |
1555 | * Remove from the mapping tree, taking care to inc the | |
1556 | * ref count so it doesn't get deleted. | |
1557 | */ | |
1558 | mapping_root = le64_to_cpu(value); | |
1559 | dm_tm_inc(pmd->tm, mapping_root); | |
1560 | r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root); | |
1561 | if (r) | |
1562 | return r; | |
1563 | ||
1564 | r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count); | |
1565 | if (r) | |
1566 | return r; | |
1567 | ||
1568 | td->mapped_blocks -= count; | |
1569 | td->changed = 1; | |
1570 | ||
1571 | /* | |
1572 | * Reinsert the mapping tree. | |
1573 | */ | |
1574 | value = cpu_to_le64(mapping_root); | |
1575 | __dm_bless_for_disk(&value); | |
1576 | return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root); | |
1577 | } | |
1578 | ||
991d9fa0 JT |
1579 | int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) |
1580 | { | |
da105ed5 | 1581 | int r = -EINVAL; |
991d9fa0 JT |
1582 | |
1583 | down_write(&td->pmd->root_lock); | |
da105ed5 JT |
1584 | if (!td->pmd->fail_io) |
1585 | r = __remove(td, block); | |
991d9fa0 | 1586 | up_write(&td->pmd->root_lock); |
19fa1a67 JT |
1587 | |
1588 | return r; | |
1589 | } | |
1590 | ||
6550f075 JT |
1591 | int dm_thin_remove_range(struct dm_thin_device *td, |
1592 | dm_block_t begin, dm_block_t end) | |
1593 | { | |
1594 | int r = -EINVAL; | |
1595 | ||
1596 | down_write(&td->pmd->root_lock); | |
1597 | if (!td->pmd->fail_io) | |
1598 | r = __remove_range(td, begin, end); | |
1599 | up_write(&td->pmd->root_lock); | |
1600 | ||
1601 | return r; | |
1602 | } | |
1603 | ||
19fa1a67 JT |
1604 | int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) |
1605 | { | |
1606 | int r; | |
1607 | uint32_t ref_count; | |
1608 | ||
1609 | down_read(&pmd->root_lock); | |
1610 | r = dm_sm_get_count(pmd->data_sm, b, &ref_count); | |
1611 | if (!r) | |
1612 | *result = (ref_count != 0); | |
1613 | up_read(&pmd->root_lock); | |
991d9fa0 JT |
1614 | |
1615 | return r; | |
1616 | } | |
1617 | ||
40db5a53 JT |
1618 | bool dm_thin_changed_this_transaction(struct dm_thin_device *td) |
1619 | { | |
1620 | int r; | |
1621 | ||
1622 | down_read(&td->pmd->root_lock); | |
1623 | r = td->changed; | |
1624 | up_read(&td->pmd->root_lock); | |
1625 | ||
1626 | return r; | |
1627 | } | |
1628 | ||
4d1662a3 MS |
1629 | bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd) |
1630 | { | |
1631 | bool r = false; | |
1632 | struct dm_thin_device *td, *tmp; | |
1633 | ||
1634 | down_read(&pmd->root_lock); | |
1635 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
1636 | if (td->changed) { | |
1637 | r = td->changed; | |
1638 | break; | |
1639 | } | |
1640 | } | |
1641 | up_read(&pmd->root_lock); | |
1642 | ||
1643 | return r; | |
1644 | } | |
1645 | ||
da105ed5 JT |
1646 | bool dm_thin_aborted_changes(struct dm_thin_device *td) |
1647 | { | |
1648 | bool r; | |
1649 | ||
1650 | down_read(&td->pmd->root_lock); | |
1651 | r = td->aborted_with_changes; | |
1652 | up_read(&td->pmd->root_lock); | |
1653 | ||
1654 | return r; | |
1655 | } | |
1656 | ||
991d9fa0 JT |
1657 | int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result) |
1658 | { | |
da105ed5 | 1659 | int r = -EINVAL; |
991d9fa0 JT |
1660 | |
1661 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1662 | if (!pmd->fail_io) |
1663 | r = dm_sm_new_block(pmd->data_sm, result); | |
991d9fa0 JT |
1664 | up_write(&pmd->root_lock); |
1665 | ||
1666 | return r; | |
1667 | } | |
1668 | ||
1669 | int dm_pool_commit_metadata(struct dm_pool_metadata *pmd) | |
1670 | { | |
da105ed5 | 1671 | int r = -EINVAL; |
991d9fa0 JT |
1672 | |
1673 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1674 | if (pmd->fail_io) |
1675 | goto out; | |
991d9fa0 JT |
1676 | |
1677 | r = __commit_transaction(pmd); | |
1678 | if (r <= 0) | |
1679 | goto out; | |
1680 | ||
1681 | /* | |
1682 | * Open the next transaction. | |
1683 | */ | |
1684 | r = __begin_transaction(pmd); | |
1685 | out: | |
1686 | up_write(&pmd->root_lock); | |
1687 | return r; | |
1688 | } | |
1689 | ||
da105ed5 JT |
1690 | static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd) |
1691 | { | |
1692 | struct dm_thin_device *td; | |
1693 | ||
1694 | list_for_each_entry(td, &pmd->thin_devices, list) | |
1695 | td->aborted_with_changes = td->changed; | |
1696 | } | |
1697 | ||
1698 | int dm_pool_abort_metadata(struct dm_pool_metadata *pmd) | |
1699 | { | |
1700 | int r = -EINVAL; | |
1701 | ||
1702 | down_write(&pmd->root_lock); | |
1703 | if (pmd->fail_io) | |
1704 | goto out; | |
1705 | ||
1706 | __set_abort_with_changes_flags(pmd); | |
1707 | __destroy_persistent_data_objects(pmd); | |
1708 | r = __create_persistent_data_objects(pmd, false); | |
1709 | if (r) | |
1710 | pmd->fail_io = true; | |
1711 | ||
1712 | out: | |
1713 | up_write(&pmd->root_lock); | |
1714 | ||
1715 | return r; | |
1716 | } | |
1717 | ||
991d9fa0 JT |
1718 | int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result) |
1719 | { | |
da105ed5 | 1720 | int r = -EINVAL; |
991d9fa0 JT |
1721 | |
1722 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1723 | if (!pmd->fail_io) |
1724 | r = dm_sm_get_nr_free(pmd->data_sm, result); | |
991d9fa0 JT |
1725 | up_read(&pmd->root_lock); |
1726 | ||
1727 | return r; | |
1728 | } | |
1729 | ||
1730 | int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, | |
1731 | dm_block_t *result) | |
1732 | { | |
da105ed5 | 1733 | int r = -EINVAL; |
991d9fa0 JT |
1734 | |
1735 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1736 | if (!pmd->fail_io) |
1737 | r = dm_sm_get_nr_free(pmd->metadata_sm, result); | |
991d9fa0 JT |
1738 | up_read(&pmd->root_lock); |
1739 | ||
1740 | return r; | |
1741 | } | |
1742 | ||
1743 | int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, | |
1744 | dm_block_t *result) | |
1745 | { | |
da105ed5 | 1746 | int r = -EINVAL; |
991d9fa0 JT |
1747 | |
1748 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1749 | if (!pmd->fail_io) |
1750 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, result); | |
991d9fa0 JT |
1751 | up_read(&pmd->root_lock); |
1752 | ||
1753 | return r; | |
1754 | } | |
1755 | ||
991d9fa0 JT |
1756 | int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result) |
1757 | { | |
da105ed5 | 1758 | int r = -EINVAL; |
991d9fa0 JT |
1759 | |
1760 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1761 | if (!pmd->fail_io) |
1762 | r = dm_sm_get_nr_blocks(pmd->data_sm, result); | |
991d9fa0 JT |
1763 | up_read(&pmd->root_lock); |
1764 | ||
1765 | return r; | |
1766 | } | |
1767 | ||
1768 | int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result) | |
1769 | { | |
da105ed5 | 1770 | int r = -EINVAL; |
991d9fa0 JT |
1771 | struct dm_pool_metadata *pmd = td->pmd; |
1772 | ||
1773 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1774 | if (!pmd->fail_io) { |
1775 | *result = td->mapped_blocks; | |
1776 | r = 0; | |
1777 | } | |
991d9fa0 JT |
1778 | up_read(&pmd->root_lock); |
1779 | ||
da105ed5 | 1780 | return r; |
991d9fa0 JT |
1781 | } |
1782 | ||
1783 | static int __highest_block(struct dm_thin_device *td, dm_block_t *result) | |
1784 | { | |
1785 | int r; | |
1786 | __le64 value_le; | |
1787 | dm_block_t thin_root; | |
1788 | struct dm_pool_metadata *pmd = td->pmd; | |
1789 | ||
1790 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le); | |
1791 | if (r) | |
1792 | return r; | |
1793 | ||
1794 | thin_root = le64_to_cpu(value_le); | |
1795 | ||
1796 | return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result); | |
1797 | } | |
1798 | ||
1799 | int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, | |
1800 | dm_block_t *result) | |
1801 | { | |
da105ed5 | 1802 | int r = -EINVAL; |
991d9fa0 JT |
1803 | struct dm_pool_metadata *pmd = td->pmd; |
1804 | ||
1805 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1806 | if (!pmd->fail_io) |
1807 | r = __highest_block(td, result); | |
991d9fa0 JT |
1808 | up_read(&pmd->root_lock); |
1809 | ||
1810 | return r; | |
1811 | } | |
1812 | ||
b17446df | 1813 | static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count) |
991d9fa0 JT |
1814 | { |
1815 | int r; | |
1816 | dm_block_t old_count; | |
1817 | ||
b17446df | 1818 | r = dm_sm_get_nr_blocks(sm, &old_count); |
991d9fa0 JT |
1819 | if (r) |
1820 | return r; | |
1821 | ||
1822 | if (new_count == old_count) | |
1823 | return 0; | |
1824 | ||
1825 | if (new_count < old_count) { | |
b17446df | 1826 | DMERR("cannot reduce size of space map"); |
991d9fa0 JT |
1827 | return -EINVAL; |
1828 | } | |
1829 | ||
b17446df | 1830 | return dm_sm_extend(sm, new_count - old_count); |
991d9fa0 JT |
1831 | } |
1832 | ||
1833 | int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) | |
1834 | { | |
da105ed5 | 1835 | int r = -EINVAL; |
991d9fa0 JT |
1836 | |
1837 | down_write(&pmd->root_lock); | |
da105ed5 | 1838 | if (!pmd->fail_io) |
b17446df | 1839 | r = __resize_space_map(pmd->data_sm, new_count); |
991d9fa0 JT |
1840 | up_write(&pmd->root_lock); |
1841 | ||
1842 | return r; | |
1843 | } | |
12ba58af | 1844 | |
24347e95 JT |
1845 | int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) |
1846 | { | |
1847 | int r = -EINVAL; | |
1848 | ||
1849 | down_write(&pmd->root_lock); | |
1850 | if (!pmd->fail_io) | |
1851 | r = __resize_space_map(pmd->metadata_sm, new_count); | |
1852 | up_write(&pmd->root_lock); | |
1853 | ||
1854 | return r; | |
1855 | } | |
1856 | ||
12ba58af JT |
1857 | void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) |
1858 | { | |
1859 | down_write(&pmd->root_lock); | |
12ba58af JT |
1860 | dm_bm_set_read_only(pmd->bm); |
1861 | up_write(&pmd->root_lock); | |
1862 | } | |
ac8c3f3d | 1863 | |
9b7aaa64 JT |
1864 | void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd) |
1865 | { | |
1866 | down_write(&pmd->root_lock); | |
9b7aaa64 JT |
1867 | dm_bm_set_read_write(pmd->bm); |
1868 | up_write(&pmd->root_lock); | |
1869 | } | |
1870 | ||
ac8c3f3d JT |
1871 | int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, |
1872 | dm_block_t threshold, | |
1873 | dm_sm_threshold_fn fn, | |
1874 | void *context) | |
1875 | { | |
1876 | int r; | |
1877 | ||
1878 | down_write(&pmd->root_lock); | |
1879 | r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context); | |
1880 | up_write(&pmd->root_lock); | |
1881 | ||
1882 | return r; | |
1883 | } | |
07f2b6e0 MS |
1884 | |
1885 | int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd) | |
1886 | { | |
1887 | int r; | |
1888 | struct dm_block *sblock; | |
1889 | struct thin_disk_superblock *disk_super; | |
1890 | ||
1891 | down_write(&pmd->root_lock); | |
1892 | pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG; | |
1893 | ||
1894 | r = superblock_lock(pmd, &sblock); | |
1895 | if (r) { | |
1896 | DMERR("couldn't read superblock"); | |
1897 | goto out; | |
1898 | } | |
1899 | ||
1900 | disk_super = dm_block_data(sblock); | |
1901 | disk_super->flags = cpu_to_le32(pmd->flags); | |
1902 | ||
1903 | dm_bm_unlock(sblock); | |
1904 | out: | |
1905 | up_write(&pmd->root_lock); | |
1906 | return r; | |
1907 | } | |
1908 | ||
1909 | bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd) | |
1910 | { | |
1911 | bool needs_check; | |
1912 | ||
1913 | down_read(&pmd->root_lock); | |
1914 | needs_check = pmd->flags & THIN_METADATA_NEEDS_CHECK_FLAG; | |
1915 | up_read(&pmd->root_lock); | |
1916 | ||
1917 | return needs_check; | |
1918 | } | |
8a01a6af JT |
1919 | |
1920 | void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd) | |
1921 | { | |
1922 | dm_tm_issue_prefetches(pmd->tm); | |
1923 | } |