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