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 | |
79 | #define THIN_VERSION 1 | |
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; | |
991d9fa0 JT |
195 | }; |
196 | ||
197 | struct dm_thin_device { | |
198 | struct list_head list; | |
199 | struct dm_pool_metadata *pmd; | |
200 | dm_thin_id id; | |
201 | ||
202 | int open_count; | |
da105ed5 JT |
203 | bool changed:1; |
204 | bool aborted_with_changes:1; | |
991d9fa0 JT |
205 | uint64_t mapped_blocks; |
206 | uint64_t transaction_id; | |
207 | uint32_t creation_time; | |
208 | uint32_t snapshotted_time; | |
209 | }; | |
210 | ||
211 | /*---------------------------------------------------------------- | |
212 | * superblock validator | |
213 | *--------------------------------------------------------------*/ | |
214 | ||
215 | #define SUPERBLOCK_CSUM_XOR 160774 | |
216 | ||
217 | static void sb_prepare_for_write(struct dm_block_validator *v, | |
218 | struct dm_block *b, | |
219 | size_t block_size) | |
220 | { | |
221 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
222 | ||
223 | disk_super->blocknr = cpu_to_le64(dm_block_location(b)); | |
224 | disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
225 | block_size - sizeof(__le32), | |
226 | SUPERBLOCK_CSUM_XOR)); | |
227 | } | |
228 | ||
229 | static int sb_check(struct dm_block_validator *v, | |
230 | struct dm_block *b, | |
231 | size_t block_size) | |
232 | { | |
233 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
234 | __le32 csum_le; | |
235 | ||
236 | if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) { | |
237 | DMERR("sb_check failed: blocknr %llu: " | |
238 | "wanted %llu", le64_to_cpu(disk_super->blocknr), | |
239 | (unsigned long long)dm_block_location(b)); | |
240 | return -ENOTBLK; | |
241 | } | |
242 | ||
243 | if (le64_to_cpu(disk_super->magic) != THIN_SUPERBLOCK_MAGIC) { | |
244 | DMERR("sb_check failed: magic %llu: " | |
245 | "wanted %llu", le64_to_cpu(disk_super->magic), | |
246 | (unsigned long long)THIN_SUPERBLOCK_MAGIC); | |
247 | return -EILSEQ; | |
248 | } | |
249 | ||
250 | csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
251 | block_size - sizeof(__le32), | |
252 | SUPERBLOCK_CSUM_XOR)); | |
253 | if (csum_le != disk_super->csum) { | |
254 | DMERR("sb_check failed: csum %u: wanted %u", | |
255 | le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum)); | |
256 | return -EILSEQ; | |
257 | } | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static struct dm_block_validator sb_validator = { | |
263 | .name = "superblock", | |
264 | .prepare_for_write = sb_prepare_for_write, | |
265 | .check = sb_check | |
266 | }; | |
267 | ||
268 | /*---------------------------------------------------------------- | |
269 | * Methods for the btree value types | |
270 | *--------------------------------------------------------------*/ | |
271 | ||
272 | static uint64_t pack_block_time(dm_block_t b, uint32_t t) | |
273 | { | |
274 | return (b << 24) | t; | |
275 | } | |
276 | ||
277 | static void unpack_block_time(uint64_t v, dm_block_t *b, uint32_t *t) | |
278 | { | |
279 | *b = v >> 24; | |
280 | *t = v & ((1 << 24) - 1); | |
281 | } | |
282 | ||
018cede9 | 283 | static void data_block_inc(void *context, const void *value_le) |
991d9fa0 JT |
284 | { |
285 | struct dm_space_map *sm = context; | |
286 | __le64 v_le; | |
287 | uint64_t b; | |
288 | uint32_t t; | |
289 | ||
290 | memcpy(&v_le, value_le, sizeof(v_le)); | |
291 | unpack_block_time(le64_to_cpu(v_le), &b, &t); | |
292 | dm_sm_inc_block(sm, b); | |
293 | } | |
294 | ||
018cede9 | 295 | static void data_block_dec(void *context, const void *value_le) |
991d9fa0 JT |
296 | { |
297 | struct dm_space_map *sm = context; | |
298 | __le64 v_le; | |
299 | uint64_t b; | |
300 | uint32_t t; | |
301 | ||
302 | memcpy(&v_le, value_le, sizeof(v_le)); | |
303 | unpack_block_time(le64_to_cpu(v_le), &b, &t); | |
304 | dm_sm_dec_block(sm, b); | |
305 | } | |
306 | ||
018cede9 | 307 | static int data_block_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
308 | { |
309 | __le64 v1_le, v2_le; | |
310 | uint64_t b1, b2; | |
311 | uint32_t t; | |
312 | ||
313 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
314 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
315 | unpack_block_time(le64_to_cpu(v1_le), &b1, &t); | |
316 | unpack_block_time(le64_to_cpu(v2_le), &b2, &t); | |
317 | ||
318 | return b1 == b2; | |
319 | } | |
320 | ||
018cede9 | 321 | static void subtree_inc(void *context, const void *value) |
991d9fa0 JT |
322 | { |
323 | struct dm_btree_info *info = context; | |
324 | __le64 root_le; | |
325 | uint64_t root; | |
326 | ||
327 | memcpy(&root_le, value, sizeof(root_le)); | |
328 | root = le64_to_cpu(root_le); | |
329 | dm_tm_inc(info->tm, root); | |
330 | } | |
331 | ||
018cede9 | 332 | static void subtree_dec(void *context, const void *value) |
991d9fa0 JT |
333 | { |
334 | struct dm_btree_info *info = context; | |
335 | __le64 root_le; | |
336 | uint64_t root; | |
337 | ||
338 | memcpy(&root_le, value, sizeof(root_le)); | |
339 | root = le64_to_cpu(root_le); | |
340 | if (dm_btree_del(info, root)) | |
341 | DMERR("btree delete failed\n"); | |
342 | } | |
343 | ||
018cede9 | 344 | static int subtree_equal(void *context, const void *value1_le, const void *value2_le) |
991d9fa0 JT |
345 | { |
346 | __le64 v1_le, v2_le; | |
347 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
348 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
349 | ||
350 | return v1_le == v2_le; | |
351 | } | |
352 | ||
353 | /*----------------------------------------------------------------*/ | |
354 | ||
25971192 JT |
355 | static int superblock_lock_zero(struct dm_pool_metadata *pmd, |
356 | struct dm_block **sblock) | |
357 | { | |
358 | return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
359 | &sb_validator, sblock); | |
360 | } | |
361 | ||
362 | static int superblock_lock(struct dm_pool_metadata *pmd, | |
363 | struct dm_block **sblock) | |
364 | { | |
365 | return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
366 | &sb_validator, sblock); | |
367 | } | |
368 | ||
332627db | 369 | static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result) |
991d9fa0 JT |
370 | { |
371 | int r; | |
372 | unsigned i; | |
373 | struct dm_block *b; | |
374 | __le64 *data_le, zero = cpu_to_le64(0); | |
375 | unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64); | |
376 | ||
377 | /* | |
378 | * We can't use a validator here - it may be all zeroes. | |
379 | */ | |
380 | r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b); | |
381 | if (r) | |
382 | return r; | |
383 | ||
384 | data_le = dm_block_data(b); | |
385 | *result = 1; | |
386 | for (i = 0; i < block_size; i++) { | |
387 | if (data_le[i] != zero) { | |
388 | *result = 0; | |
389 | break; | |
390 | } | |
391 | } | |
392 | ||
393 | return dm_bm_unlock(b); | |
394 | } | |
395 | ||
41675aea JT |
396 | static void __setup_btree_details(struct dm_pool_metadata *pmd) |
397 | { | |
398 | pmd->info.tm = pmd->tm; | |
399 | pmd->info.levels = 2; | |
400 | pmd->info.value_type.context = pmd->data_sm; | |
401 | pmd->info.value_type.size = sizeof(__le64); | |
402 | pmd->info.value_type.inc = data_block_inc; | |
403 | pmd->info.value_type.dec = data_block_dec; | |
404 | pmd->info.value_type.equal = data_block_equal; | |
405 | ||
406 | memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info)); | |
407 | pmd->nb_info.tm = pmd->nb_tm; | |
408 | ||
409 | pmd->tl_info.tm = pmd->tm; | |
410 | pmd->tl_info.levels = 1; | |
e3cbf945 | 411 | pmd->tl_info.value_type.context = &pmd->bl_info; |
41675aea JT |
412 | pmd->tl_info.value_type.size = sizeof(__le64); |
413 | pmd->tl_info.value_type.inc = subtree_inc; | |
414 | pmd->tl_info.value_type.dec = subtree_dec; | |
415 | pmd->tl_info.value_type.equal = subtree_equal; | |
416 | ||
417 | pmd->bl_info.tm = pmd->tm; | |
418 | pmd->bl_info.levels = 1; | |
419 | pmd->bl_info.value_type.context = pmd->data_sm; | |
420 | pmd->bl_info.value_type.size = sizeof(__le64); | |
421 | pmd->bl_info.value_type.inc = data_block_inc; | |
422 | pmd->bl_info.value_type.dec = data_block_dec; | |
423 | pmd->bl_info.value_type.equal = data_block_equal; | |
424 | ||
425 | pmd->details_info.tm = pmd->tm; | |
426 | pmd->details_info.levels = 1; | |
427 | pmd->details_info.value_type.context = NULL; | |
428 | pmd->details_info.value_type.size = sizeof(struct disk_device_details); | |
429 | pmd->details_info.value_type.inc = NULL; | |
430 | pmd->details_info.value_type.dec = NULL; | |
431 | pmd->details_info.value_type.equal = NULL; | |
432 | } | |
433 | ||
9cb6653f JT |
434 | static int __write_initial_superblock(struct dm_pool_metadata *pmd) |
435 | { | |
436 | int r; | |
437 | struct dm_block *sblock; | |
10d2a9ff | 438 | size_t metadata_len, data_len; |
9cb6653f JT |
439 | struct thin_disk_superblock *disk_super; |
440 | sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT; | |
441 | ||
442 | if (bdev_size > THIN_METADATA_MAX_SECTORS) | |
443 | bdev_size = THIN_METADATA_MAX_SECTORS; | |
444 | ||
10d2a9ff JT |
445 | r = dm_sm_root_size(pmd->metadata_sm, &metadata_len); |
446 | if (r < 0) | |
447 | return r; | |
448 | ||
449 | r = dm_sm_root_size(pmd->data_sm, &data_len); | |
450 | if (r < 0) | |
451 | return r; | |
452 | ||
453 | r = dm_sm_commit(pmd->data_sm); | |
454 | if (r < 0) | |
455 | return r; | |
456 | ||
457 | r = dm_tm_pre_commit(pmd->tm); | |
458 | if (r < 0) | |
459 | return r; | |
460 | ||
9cb6653f JT |
461 | r = superblock_lock_zero(pmd, &sblock); |
462 | if (r) | |
463 | return r; | |
464 | ||
465 | disk_super = dm_block_data(sblock); | |
10d2a9ff | 466 | disk_super->flags = 0; |
583ceee2 | 467 | memset(disk_super->uuid, 0, sizeof(disk_super->uuid)); |
9cb6653f JT |
468 | disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC); |
469 | disk_super->version = cpu_to_le32(THIN_VERSION); | |
470 | disk_super->time = 0; | |
10d2a9ff JT |
471 | disk_super->trans_id = 0; |
472 | disk_super->held_root = 0; | |
473 | ||
474 | r = dm_sm_copy_root(pmd->metadata_sm, &disk_super->metadata_space_map_root, | |
475 | metadata_len); | |
476 | if (r < 0) | |
477 | goto bad_locked; | |
478 | ||
479 | r = dm_sm_copy_root(pmd->data_sm, &disk_super->data_space_map_root, | |
480 | data_len); | |
481 | if (r < 0) | |
482 | goto bad_locked; | |
483 | ||
484 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
485 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
9cb6653f JT |
486 | disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE >> SECTOR_SHIFT); |
487 | disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT); | |
488 | disk_super->data_block_size = cpu_to_le32(pmd->data_block_size); | |
489 | ||
270938ba | 490 | return dm_tm_commit(pmd->tm, sblock); |
9cb6653f | 491 | |
10d2a9ff JT |
492 | bad_locked: |
493 | dm_bm_unlock(sblock); | |
9cb6653f JT |
494 | return r; |
495 | } | |
496 | ||
a97e5e6f | 497 | static int __format_metadata(struct dm_pool_metadata *pmd) |
991d9fa0 JT |
498 | { |
499 | int r; | |
384ef0e6 | 500 | |
e4d2205c JT |
501 | r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
502 | &pmd->tm, &pmd->metadata_sm); | |
503 | if (r < 0) { | |
504 | DMERR("tm_create_with_sm failed"); | |
505 | return r; | |
506 | } | |
991d9fa0 | 507 | |
a97e5e6f | 508 | pmd->data_sm = dm_sm_disk_create(pmd->tm, 0); |
e4d2205c JT |
509 | if (IS_ERR(pmd->data_sm)) { |
510 | DMERR("sm_disk_create failed"); | |
511 | r = PTR_ERR(pmd->data_sm); | |
0fa5b17b | 512 | goto bad_cleanup_tm; |
991d9fa0 JT |
513 | } |
514 | ||
d6332814 | 515 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
991d9fa0 | 516 | if (!pmd->nb_tm) { |
0fa5b17b | 517 | DMERR("could not create non-blocking clone tm"); |
991d9fa0 | 518 | r = -ENOMEM; |
0fa5b17b | 519 | goto bad_cleanup_data_sm; |
991d9fa0 JT |
520 | } |
521 | ||
41675aea | 522 | __setup_btree_details(pmd); |
991d9fa0 | 523 | |
9cb6653f JT |
524 | r = dm_btree_empty(&pmd->info, &pmd->root); |
525 | if (r < 0) | |
0fa5b17b | 526 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
527 | |
528 | r = dm_btree_empty(&pmd->details_info, &pmd->details_root); | |
529 | if (r < 0) { | |
530 | DMERR("couldn't create devices root"); | |
0fa5b17b | 531 | goto bad_cleanup_nb_tm; |
9cb6653f JT |
532 | } |
533 | ||
534 | r = __write_initial_superblock(pmd); | |
535 | if (r) | |
0fa5b17b | 536 | goto bad_cleanup_nb_tm; |
9cb6653f | 537 | |
991d9fa0 JT |
538 | return 0; |
539 | ||
0fa5b17b JT |
540 | bad_cleanup_nb_tm: |
541 | dm_tm_destroy(pmd->nb_tm); | |
542 | bad_cleanup_data_sm: | |
d6332814 | 543 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 544 | bad_cleanup_tm: |
d6332814 JT |
545 | dm_tm_destroy(pmd->tm); |
546 | dm_sm_destroy(pmd->metadata_sm); | |
991d9fa0 JT |
547 | |
548 | return r; | |
549 | } | |
550 | ||
d73ec525 MS |
551 | static int __check_incompat_features(struct thin_disk_superblock *disk_super, |
552 | struct dm_pool_metadata *pmd) | |
553 | { | |
554 | uint32_t features; | |
555 | ||
556 | features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP; | |
557 | if (features) { | |
558 | DMERR("could not access metadata due to unsupported optional features (%lx).", | |
559 | (unsigned long)features); | |
560 | return -EINVAL; | |
561 | } | |
562 | ||
563 | /* | |
564 | * Check for read-only metadata to skip the following RDWR checks. | |
565 | */ | |
566 | if (get_disk_ro(pmd->bdev->bd_disk)) | |
567 | return 0; | |
568 | ||
569 | features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP; | |
570 | if (features) { | |
571 | DMERR("could not access metadata RDWR due to unsupported optional features (%lx).", | |
572 | (unsigned long)features); | |
573 | return -EINVAL; | |
574 | } | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
e4d2205c JT |
579 | static int __open_metadata(struct dm_pool_metadata *pmd) |
580 | { | |
581 | int r; | |
582 | struct dm_block *sblock; | |
583 | struct thin_disk_superblock *disk_super; | |
584 | ||
585 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
586 | &sb_validator, &sblock); | |
587 | if (r < 0) { | |
588 | DMERR("couldn't read superblock"); | |
589 | return r; | |
590 | } | |
591 | ||
592 | disk_super = dm_block_data(sblock); | |
d73ec525 | 593 | |
4bbfb80c MS |
594 | /* Verify the data block size hasn't changed */ |
595 | if (le32_to_cpu(disk_super->data_block_size) != pmd->data_block_size) { | |
596 | DMERR("changing the data block size (from %u to %llu) is not supported", | |
597 | le32_to_cpu(disk_super->data_block_size), | |
598 | (unsigned long long)pmd->data_block_size); | |
599 | r = -EINVAL; | |
600 | goto bad_unlock_sblock; | |
601 | } | |
602 | ||
d73ec525 | 603 | r = __check_incompat_features(disk_super, pmd); |
0fa5b17b JT |
604 | if (r < 0) |
605 | goto bad_unlock_sblock; | |
d73ec525 | 606 | |
e4d2205c JT |
607 | r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, |
608 | disk_super->metadata_space_map_root, | |
609 | sizeof(disk_super->metadata_space_map_root), | |
610 | &pmd->tm, &pmd->metadata_sm); | |
611 | if (r < 0) { | |
612 | DMERR("tm_open_with_sm failed"); | |
0fa5b17b | 613 | goto bad_unlock_sblock; |
e4d2205c JT |
614 | } |
615 | ||
616 | pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root, | |
617 | sizeof(disk_super->data_space_map_root)); | |
618 | if (IS_ERR(pmd->data_sm)) { | |
619 | DMERR("sm_disk_open failed"); | |
e4d2205c | 620 | r = PTR_ERR(pmd->data_sm); |
0fa5b17b | 621 | goto bad_cleanup_tm; |
e4d2205c JT |
622 | } |
623 | ||
e4d2205c JT |
624 | pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
625 | if (!pmd->nb_tm) { | |
0fa5b17b | 626 | DMERR("could not create non-blocking clone tm"); |
e4d2205c | 627 | r = -ENOMEM; |
0fa5b17b | 628 | goto bad_cleanup_data_sm; |
e4d2205c JT |
629 | } |
630 | ||
631 | __setup_btree_details(pmd); | |
0fa5b17b | 632 | return dm_bm_unlock(sblock); |
e4d2205c | 633 | |
0fa5b17b | 634 | bad_cleanup_data_sm: |
e4d2205c | 635 | dm_sm_destroy(pmd->data_sm); |
0fa5b17b | 636 | bad_cleanup_tm: |
e4d2205c JT |
637 | dm_tm_destroy(pmd->tm); |
638 | dm_sm_destroy(pmd->metadata_sm); | |
0fa5b17b JT |
639 | bad_unlock_sblock: |
640 | dm_bm_unlock(sblock); | |
e4d2205c JT |
641 | |
642 | return r; | |
643 | } | |
644 | ||
66b1edc0 | 645 | static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device) |
e4d2205c | 646 | { |
8801e069 | 647 | int r, unformatted; |
237074c0 | 648 | |
8801e069 | 649 | r = __superblock_all_zeroes(pmd->bm, &unformatted); |
237074c0 JT |
650 | if (r) |
651 | return r; | |
652 | ||
8801e069 | 653 | if (unformatted) |
66b1edc0 JT |
654 | return format_device ? __format_metadata(pmd) : -EPERM; |
655 | ||
656 | return __open_metadata(pmd); | |
e4d2205c JT |
657 | } |
658 | ||
66b1edc0 | 659 | static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device) |
332627db JT |
660 | { |
661 | int r; | |
662 | ||
663 | pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE, | |
664 | THIN_METADATA_CACHE_SIZE, | |
665 | THIN_MAX_CONCURRENT_LOCKS); | |
666 | if (IS_ERR(pmd->bm)) { | |
667 | DMERR("could not create block manager"); | |
668 | return PTR_ERR(pmd->bm); | |
669 | } | |
670 | ||
66b1edc0 | 671 | r = __open_or_format_metadata(pmd, format_device); |
332627db JT |
672 | if (r) |
673 | dm_block_manager_destroy(pmd->bm); | |
674 | ||
675 | return r; | |
676 | } | |
677 | ||
f9dd9352 JT |
678 | static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd) |
679 | { | |
680 | dm_sm_destroy(pmd->data_sm); | |
681 | dm_sm_destroy(pmd->metadata_sm); | |
682 | dm_tm_destroy(pmd->nb_tm); | |
683 | dm_tm_destroy(pmd->tm); | |
684 | dm_block_manager_destroy(pmd->bm); | |
685 | } | |
686 | ||
991d9fa0 JT |
687 | static int __begin_transaction(struct dm_pool_metadata *pmd) |
688 | { | |
689 | int r; | |
991d9fa0 JT |
690 | struct thin_disk_superblock *disk_super; |
691 | struct dm_block *sblock; | |
692 | ||
991d9fa0 JT |
693 | /* |
694 | * We re-read the superblock every time. Shouldn't need to do this | |
695 | * really. | |
696 | */ | |
697 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
698 | &sb_validator, &sblock); | |
699 | if (r) | |
700 | return r; | |
701 | ||
702 | disk_super = dm_block_data(sblock); | |
703 | pmd->time = le32_to_cpu(disk_super->time); | |
704 | pmd->root = le64_to_cpu(disk_super->data_mapping_root); | |
705 | pmd->details_root = le64_to_cpu(disk_super->device_details_root); | |
706 | pmd->trans_id = le64_to_cpu(disk_super->trans_id); | |
707 | pmd->flags = le32_to_cpu(disk_super->flags); | |
708 | pmd->data_block_size = le32_to_cpu(disk_super->data_block_size); | |
709 | ||
991d9fa0 | 710 | dm_bm_unlock(sblock); |
d73ec525 | 711 | return 0; |
991d9fa0 JT |
712 | } |
713 | ||
714 | static int __write_changed_details(struct dm_pool_metadata *pmd) | |
715 | { | |
716 | int r; | |
717 | struct dm_thin_device *td, *tmp; | |
718 | struct disk_device_details details; | |
719 | uint64_t key; | |
720 | ||
721 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
722 | if (!td->changed) | |
723 | continue; | |
724 | ||
725 | key = td->id; | |
726 | ||
727 | details.mapped_blocks = cpu_to_le64(td->mapped_blocks); | |
728 | details.transaction_id = cpu_to_le64(td->transaction_id); | |
729 | details.creation_time = cpu_to_le32(td->creation_time); | |
730 | details.snapshotted_time = cpu_to_le32(td->snapshotted_time); | |
731 | __dm_bless_for_disk(&details); | |
732 | ||
733 | r = dm_btree_insert(&pmd->details_info, pmd->details_root, | |
734 | &key, &details, &pmd->details_root); | |
735 | if (r) | |
736 | return r; | |
737 | ||
738 | if (td->open_count) | |
739 | td->changed = 0; | |
740 | else { | |
741 | list_del(&td->list); | |
742 | kfree(td); | |
743 | } | |
991d9fa0 JT |
744 | } |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
749 | static int __commit_transaction(struct dm_pool_metadata *pmd) | |
750 | { | |
991d9fa0 JT |
751 | int r; |
752 | size_t metadata_len, data_len; | |
753 | struct thin_disk_superblock *disk_super; | |
754 | struct dm_block *sblock; | |
755 | ||
756 | /* | |
757 | * We need to know if the thin_disk_superblock exceeds a 512-byte sector. | |
758 | */ | |
759 | BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512); | |
760 | ||
761 | r = __write_changed_details(pmd); | |
762 | if (r < 0) | |
d973ac19 | 763 | return r; |
991d9fa0 | 764 | |
991d9fa0 JT |
765 | r = dm_sm_commit(pmd->data_sm); |
766 | if (r < 0) | |
d973ac19 | 767 | return r; |
991d9fa0 JT |
768 | |
769 | r = dm_tm_pre_commit(pmd->tm); | |
770 | if (r < 0) | |
d973ac19 | 771 | return r; |
991d9fa0 JT |
772 | |
773 | r = dm_sm_root_size(pmd->metadata_sm, &metadata_len); | |
774 | if (r < 0) | |
d973ac19 | 775 | return r; |
991d9fa0 | 776 | |
fef838cc | 777 | r = dm_sm_root_size(pmd->data_sm, &data_len); |
991d9fa0 | 778 | if (r < 0) |
d973ac19 | 779 | return r; |
991d9fa0 | 780 | |
25971192 | 781 | r = superblock_lock(pmd, &sblock); |
991d9fa0 | 782 | if (r) |
d973ac19 | 783 | return r; |
991d9fa0 JT |
784 | |
785 | disk_super = dm_block_data(sblock); | |
786 | disk_super->time = cpu_to_le32(pmd->time); | |
787 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
788 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
789 | disk_super->trans_id = cpu_to_le64(pmd->trans_id); | |
790 | disk_super->flags = cpu_to_le32(pmd->flags); | |
791 | ||
792 | r = dm_sm_copy_root(pmd->metadata_sm, &disk_super->metadata_space_map_root, | |
793 | metadata_len); | |
794 | if (r < 0) | |
795 | goto out_locked; | |
796 | ||
797 | r = dm_sm_copy_root(pmd->data_sm, &disk_super->data_space_map_root, | |
798 | data_len); | |
799 | if (r < 0) | |
800 | goto out_locked; | |
801 | ||
eb04cf63 | 802 | return dm_tm_commit(pmd->tm, sblock); |
991d9fa0 JT |
803 | |
804 | out_locked: | |
805 | dm_bm_unlock(sblock); | |
806 | return r; | |
807 | } | |
808 | ||
809 | struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, | |
66b1edc0 JT |
810 | sector_t data_block_size, |
811 | bool format_device) | |
991d9fa0 JT |
812 | { |
813 | int r; | |
991d9fa0 | 814 | struct dm_pool_metadata *pmd; |
991d9fa0 JT |
815 | |
816 | pmd = kmalloc(sizeof(*pmd), GFP_KERNEL); | |
817 | if (!pmd) { | |
818 | DMERR("could not allocate metadata struct"); | |
819 | return ERR_PTR(-ENOMEM); | |
820 | } | |
821 | ||
6a0ebd31 JT |
822 | init_rwsem(&pmd->root_lock); |
823 | pmd->time = 0; | |
824 | INIT_LIST_HEAD(&pmd->thin_devices); | |
12ba58af | 825 | pmd->read_only = false; |
da105ed5 | 826 | pmd->fail_io = false; |
332627db | 827 | pmd->bdev = bdev; |
9cb6653f | 828 | pmd->data_block_size = data_block_size; |
991d9fa0 | 829 | |
66b1edc0 | 830 | r = __create_persistent_data_objects(pmd, format_device); |
991d9fa0 | 831 | if (r) { |
991d9fa0 JT |
832 | kfree(pmd); |
833 | return ERR_PTR(r); | |
834 | } | |
991d9fa0 | 835 | |
270938ba JT |
836 | r = __begin_transaction(pmd); |
837 | if (r < 0) { | |
838 | if (dm_pool_metadata_close(pmd) < 0) | |
839 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); | |
840 | return ERR_PTR(r); | |
991d9fa0 JT |
841 | } |
842 | ||
843 | return pmd; | |
991d9fa0 JT |
844 | } |
845 | ||
846 | int dm_pool_metadata_close(struct dm_pool_metadata *pmd) | |
847 | { | |
848 | int r; | |
849 | unsigned open_devices = 0; | |
850 | struct dm_thin_device *td, *tmp; | |
851 | ||
852 | down_read(&pmd->root_lock); | |
853 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
854 | if (td->open_count) | |
855 | open_devices++; | |
856 | else { | |
857 | list_del(&td->list); | |
858 | kfree(td); | |
859 | } | |
860 | } | |
861 | up_read(&pmd->root_lock); | |
862 | ||
863 | if (open_devices) { | |
864 | DMERR("attempt to close pmd when %u device(s) are still open", | |
865 | open_devices); | |
866 | return -EBUSY; | |
867 | } | |
868 | ||
da105ed5 | 869 | if (!pmd->read_only && !pmd->fail_io) { |
12ba58af JT |
870 | r = __commit_transaction(pmd); |
871 | if (r < 0) | |
872 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
873 | __func__, r); | |
874 | } | |
991d9fa0 | 875 | |
da105ed5 JT |
876 | if (!pmd->fail_io) |
877 | __destroy_persistent_data_objects(pmd); | |
991d9fa0 | 878 | |
da105ed5 | 879 | kfree(pmd); |
991d9fa0 JT |
880 | return 0; |
881 | } | |
882 | ||
1f3db25d MS |
883 | /* |
884 | * __open_device: Returns @td corresponding to device with id @dev, | |
885 | * creating it if @create is set and incrementing @td->open_count. | |
886 | * On failure, @td is undefined. | |
887 | */ | |
991d9fa0 JT |
888 | static int __open_device(struct dm_pool_metadata *pmd, |
889 | dm_thin_id dev, int create, | |
890 | struct dm_thin_device **td) | |
891 | { | |
892 | int r, changed = 0; | |
893 | struct dm_thin_device *td2; | |
894 | uint64_t key = dev; | |
895 | struct disk_device_details details_le; | |
896 | ||
897 | /* | |
1f3db25d | 898 | * If the device is already open, return it. |
991d9fa0 JT |
899 | */ |
900 | list_for_each_entry(td2, &pmd->thin_devices, list) | |
901 | if (td2->id == dev) { | |
1f3db25d MS |
902 | /* |
903 | * May not create an already-open device. | |
904 | */ | |
905 | if (create) | |
906 | return -EEXIST; | |
907 | ||
991d9fa0 JT |
908 | td2->open_count++; |
909 | *td = td2; | |
910 | return 0; | |
911 | } | |
912 | ||
913 | /* | |
914 | * Check the device exists. | |
915 | */ | |
916 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
917 | &key, &details_le); | |
918 | if (r) { | |
919 | if (r != -ENODATA || !create) | |
920 | return r; | |
921 | ||
1f3db25d MS |
922 | /* |
923 | * Create new device. | |
924 | */ | |
991d9fa0 JT |
925 | changed = 1; |
926 | details_le.mapped_blocks = 0; | |
927 | details_le.transaction_id = cpu_to_le64(pmd->trans_id); | |
928 | details_le.creation_time = cpu_to_le32(pmd->time); | |
929 | details_le.snapshotted_time = cpu_to_le32(pmd->time); | |
930 | } | |
931 | ||
932 | *td = kmalloc(sizeof(**td), GFP_NOIO); | |
933 | if (!*td) | |
934 | return -ENOMEM; | |
935 | ||
936 | (*td)->pmd = pmd; | |
937 | (*td)->id = dev; | |
938 | (*td)->open_count = 1; | |
939 | (*td)->changed = changed; | |
da105ed5 | 940 | (*td)->aborted_with_changes = false; |
991d9fa0 JT |
941 | (*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks); |
942 | (*td)->transaction_id = le64_to_cpu(details_le.transaction_id); | |
943 | (*td)->creation_time = le32_to_cpu(details_le.creation_time); | |
944 | (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time); | |
945 | ||
946 | list_add(&(*td)->list, &pmd->thin_devices); | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
951 | static void __close_device(struct dm_thin_device *td) | |
952 | { | |
953 | --td->open_count; | |
954 | } | |
955 | ||
956 | static int __create_thin(struct dm_pool_metadata *pmd, | |
957 | dm_thin_id dev) | |
958 | { | |
959 | int r; | |
960 | dm_block_t dev_root; | |
961 | uint64_t key = dev; | |
962 | struct disk_device_details details_le; | |
963 | struct dm_thin_device *td; | |
964 | __le64 value; | |
965 | ||
966 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
967 | &key, &details_le); | |
968 | if (!r) | |
969 | return -EEXIST; | |
970 | ||
971 | /* | |
972 | * Create an empty btree for the mappings. | |
973 | */ | |
974 | r = dm_btree_empty(&pmd->bl_info, &dev_root); | |
975 | if (r) | |
976 | return r; | |
977 | ||
978 | /* | |
979 | * Insert it into the main mapping tree. | |
980 | */ | |
981 | value = cpu_to_le64(dev_root); | |
982 | __dm_bless_for_disk(&value); | |
983 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
984 | if (r) { | |
985 | dm_btree_del(&pmd->bl_info, dev_root); | |
986 | return r; | |
987 | } | |
988 | ||
989 | r = __open_device(pmd, dev, 1, &td); | |
990 | if (r) { | |
991d9fa0 JT |
991 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
992 | dm_btree_del(&pmd->bl_info, dev_root); | |
993 | return r; | |
994 | } | |
991d9fa0 JT |
995 | __close_device(td); |
996 | ||
997 | return r; | |
998 | } | |
999 | ||
1000 | int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1001 | { | |
da105ed5 | 1002 | int r = -EINVAL; |
991d9fa0 JT |
1003 | |
1004 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1005 | if (!pmd->fail_io) |
1006 | r = __create_thin(pmd, dev); | |
991d9fa0 JT |
1007 | up_write(&pmd->root_lock); |
1008 | ||
1009 | return r; | |
1010 | } | |
1011 | ||
1012 | static int __set_snapshot_details(struct dm_pool_metadata *pmd, | |
1013 | struct dm_thin_device *snap, | |
1014 | dm_thin_id origin, uint32_t time) | |
1015 | { | |
1016 | int r; | |
1017 | struct dm_thin_device *td; | |
1018 | ||
1019 | r = __open_device(pmd, origin, 0, &td); | |
1020 | if (r) | |
1021 | return r; | |
1022 | ||
1023 | td->changed = 1; | |
1024 | td->snapshotted_time = time; | |
1025 | ||
1026 | snap->mapped_blocks = td->mapped_blocks; | |
1027 | snap->snapshotted_time = time; | |
1028 | __close_device(td); | |
1029 | ||
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | static int __create_snap(struct dm_pool_metadata *pmd, | |
1034 | dm_thin_id dev, dm_thin_id origin) | |
1035 | { | |
1036 | int r; | |
1037 | dm_block_t origin_root; | |
1038 | uint64_t key = origin, dev_key = dev; | |
1039 | struct dm_thin_device *td; | |
1040 | struct disk_device_details details_le; | |
1041 | __le64 value; | |
1042 | ||
1043 | /* check this device is unused */ | |
1044 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
1045 | &dev_key, &details_le); | |
1046 | if (!r) | |
1047 | return -EEXIST; | |
1048 | ||
1049 | /* find the mapping tree for the origin */ | |
1050 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value); | |
1051 | if (r) | |
1052 | return r; | |
1053 | origin_root = le64_to_cpu(value); | |
1054 | ||
1055 | /* clone the origin, an inc will do */ | |
1056 | dm_tm_inc(pmd->tm, origin_root); | |
1057 | ||
1058 | /* insert into the main mapping tree */ | |
1059 | value = cpu_to_le64(origin_root); | |
1060 | __dm_bless_for_disk(&value); | |
1061 | key = dev; | |
1062 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
1063 | if (r) { | |
1064 | dm_tm_dec(pmd->tm, origin_root); | |
1065 | return r; | |
1066 | } | |
1067 | ||
1068 | pmd->time++; | |
1069 | ||
1070 | r = __open_device(pmd, dev, 1, &td); | |
1071 | if (r) | |
1072 | goto bad; | |
1073 | ||
1074 | r = __set_snapshot_details(pmd, td, origin, pmd->time); | |
1f3db25d MS |
1075 | __close_device(td); |
1076 | ||
991d9fa0 JT |
1077 | if (r) |
1078 | goto bad; | |
1079 | ||
991d9fa0 JT |
1080 | return 0; |
1081 | ||
1082 | bad: | |
991d9fa0 JT |
1083 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); |
1084 | dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1085 | &key, &pmd->details_root); | |
1086 | return r; | |
1087 | } | |
1088 | ||
1089 | int dm_pool_create_snap(struct dm_pool_metadata *pmd, | |
1090 | dm_thin_id dev, | |
1091 | dm_thin_id origin) | |
1092 | { | |
da105ed5 | 1093 | int r = -EINVAL; |
991d9fa0 JT |
1094 | |
1095 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1096 | if (!pmd->fail_io) |
1097 | r = __create_snap(pmd, dev, origin); | |
991d9fa0 JT |
1098 | up_write(&pmd->root_lock); |
1099 | ||
1100 | return r; | |
1101 | } | |
1102 | ||
1103 | static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
1104 | { | |
1105 | int r; | |
1106 | uint64_t key = dev; | |
1107 | struct dm_thin_device *td; | |
1108 | ||
1109 | /* TODO: failure should mark the transaction invalid */ | |
1110 | r = __open_device(pmd, dev, 0, &td); | |
1111 | if (r) | |
1112 | return r; | |
1113 | ||
1114 | if (td->open_count > 1) { | |
1115 | __close_device(td); | |
1116 | return -EBUSY; | |
1117 | } | |
1118 | ||
1119 | list_del(&td->list); | |
1120 | kfree(td); | |
1121 | r = dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1122 | &key, &pmd->details_root); | |
1123 | if (r) | |
1124 | return r; | |
1125 | ||
1126 | r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); | |
1127 | if (r) | |
1128 | return r; | |
1129 | ||
991d9fa0 JT |
1130 | return 0; |
1131 | } | |
1132 | ||
1133 | int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, | |
1134 | dm_thin_id dev) | |
1135 | { | |
da105ed5 | 1136 | int r = -EINVAL; |
991d9fa0 JT |
1137 | |
1138 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1139 | if (!pmd->fail_io) |
1140 | r = __delete_device(pmd, dev); | |
991d9fa0 JT |
1141 | up_write(&pmd->root_lock); |
1142 | ||
1143 | return r; | |
1144 | } | |
1145 | ||
1146 | int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1147 | uint64_t current_id, | |
1148 | uint64_t new_id) | |
1149 | { | |
da105ed5 JT |
1150 | int r = -EINVAL; |
1151 | ||
991d9fa0 | 1152 | down_write(&pmd->root_lock); |
da105ed5 JT |
1153 | |
1154 | if (pmd->fail_io) | |
1155 | goto out; | |
1156 | ||
991d9fa0 | 1157 | if (pmd->trans_id != current_id) { |
991d9fa0 | 1158 | DMERR("mismatched transaction id"); |
da105ed5 | 1159 | goto out; |
991d9fa0 JT |
1160 | } |
1161 | ||
1162 | pmd->trans_id = new_id; | |
da105ed5 JT |
1163 | r = 0; |
1164 | ||
1165 | out: | |
991d9fa0 JT |
1166 | up_write(&pmd->root_lock); |
1167 | ||
da105ed5 | 1168 | return r; |
991d9fa0 JT |
1169 | } |
1170 | ||
1171 | int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1172 | uint64_t *result) | |
1173 | { | |
da105ed5 JT |
1174 | int r = -EINVAL; |
1175 | ||
991d9fa0 | 1176 | down_read(&pmd->root_lock); |
da105ed5 JT |
1177 | if (!pmd->fail_io) { |
1178 | *result = pmd->trans_id; | |
1179 | r = 0; | |
1180 | } | |
991d9fa0 JT |
1181 | up_read(&pmd->root_lock); |
1182 | ||
da105ed5 | 1183 | return r; |
991d9fa0 JT |
1184 | } |
1185 | ||
cc8394d8 JT |
1186 | static int __reserve_metadata_snap(struct dm_pool_metadata *pmd) |
1187 | { | |
1188 | int r, inc; | |
1189 | struct thin_disk_superblock *disk_super; | |
1190 | struct dm_block *copy, *sblock; | |
1191 | dm_block_t held_root; | |
1192 | ||
1193 | /* | |
1194 | * Copy the superblock. | |
1195 | */ | |
1196 | dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION); | |
1197 | r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION, | |
1198 | &sb_validator, ©, &inc); | |
1199 | if (r) | |
1200 | return r; | |
1201 | ||
1202 | BUG_ON(!inc); | |
1203 | ||
1204 | held_root = dm_block_location(copy); | |
1205 | disk_super = dm_block_data(copy); | |
1206 | ||
1207 | if (le64_to_cpu(disk_super->held_root)) { | |
1208 | DMWARN("Pool metadata snapshot already exists: release this before taking another."); | |
1209 | ||
1210 | dm_tm_dec(pmd->tm, held_root); | |
1211 | dm_tm_unlock(pmd->tm, copy); | |
cc8394d8 JT |
1212 | return -EBUSY; |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Wipe the spacemap since we're not publishing this. | |
1217 | */ | |
1218 | memset(&disk_super->data_space_map_root, 0, | |
1219 | sizeof(disk_super->data_space_map_root)); | |
1220 | memset(&disk_super->metadata_space_map_root, 0, | |
1221 | sizeof(disk_super->metadata_space_map_root)); | |
1222 | ||
1223 | /* | |
1224 | * Increment the data structures that need to be preserved. | |
1225 | */ | |
1226 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root)); | |
1227 | dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root)); | |
1228 | dm_tm_unlock(pmd->tm, copy); | |
1229 | ||
1230 | /* | |
1231 | * Write the held root into the superblock. | |
1232 | */ | |
25971192 | 1233 | r = superblock_lock(pmd, &sblock); |
cc8394d8 JT |
1234 | if (r) { |
1235 | dm_tm_dec(pmd->tm, held_root); | |
cc8394d8 JT |
1236 | return r; |
1237 | } | |
1238 | ||
1239 | disk_super = dm_block_data(sblock); | |
1240 | disk_super->held_root = cpu_to_le64(held_root); | |
1241 | dm_bm_unlock(sblock); | |
cc8394d8 JT |
1242 | return 0; |
1243 | } | |
1244 | ||
1245 | int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd) | |
1246 | { | |
da105ed5 | 1247 | int r = -EINVAL; |
cc8394d8 JT |
1248 | |
1249 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1250 | if (!pmd->fail_io) |
1251 | r = __reserve_metadata_snap(pmd); | |
cc8394d8 JT |
1252 | up_write(&pmd->root_lock); |
1253 | ||
1254 | return r; | |
1255 | } | |
1256 | ||
1257 | static int __release_metadata_snap(struct dm_pool_metadata *pmd) | |
991d9fa0 JT |
1258 | { |
1259 | int r; | |
1260 | struct thin_disk_superblock *disk_super; | |
cc8394d8 JT |
1261 | struct dm_block *sblock, *copy; |
1262 | dm_block_t held_root; | |
991d9fa0 | 1263 | |
25971192 | 1264 | r = superblock_lock(pmd, &sblock); |
991d9fa0 JT |
1265 | if (r) |
1266 | return r; | |
1267 | ||
cc8394d8 JT |
1268 | disk_super = dm_block_data(sblock); |
1269 | held_root = le64_to_cpu(disk_super->held_root); | |
1270 | disk_super->held_root = cpu_to_le64(0); | |
cc8394d8 JT |
1271 | |
1272 | dm_bm_unlock(sblock); | |
1273 | ||
1274 | if (!held_root) { | |
1275 | DMWARN("No pool metadata snapshot found: nothing to release."); | |
1276 | return -EINVAL; | |
1277 | } | |
1278 | ||
1279 | r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, ©); | |
1280 | if (r) | |
1281 | return r; | |
1282 | ||
1283 | disk_super = dm_block_data(copy); | |
1284 | dm_sm_dec_block(pmd->metadata_sm, le64_to_cpu(disk_super->data_mapping_root)); | |
1285 | dm_sm_dec_block(pmd->metadata_sm, le64_to_cpu(disk_super->device_details_root)); | |
1286 | dm_sm_dec_block(pmd->metadata_sm, held_root); | |
1287 | ||
1288 | return dm_tm_unlock(pmd->tm, copy); | |
1289 | } | |
1290 | ||
1291 | int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd) | |
1292 | { | |
da105ed5 | 1293 | int r = -EINVAL; |
cc8394d8 JT |
1294 | |
1295 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1296 | if (!pmd->fail_io) |
1297 | r = __release_metadata_snap(pmd); | |
cc8394d8 JT |
1298 | up_write(&pmd->root_lock); |
1299 | ||
1300 | return r; | |
1301 | } | |
1302 | ||
1303 | static int __get_metadata_snap(struct dm_pool_metadata *pmd, | |
1304 | dm_block_t *result) | |
1305 | { | |
1306 | int r; | |
1307 | struct thin_disk_superblock *disk_super; | |
1308 | struct dm_block *sblock; | |
1309 | ||
1310 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
1311 | &sb_validator, &sblock); | |
1312 | if (r) | |
1313 | return r; | |
1314 | ||
991d9fa0 JT |
1315 | disk_super = dm_block_data(sblock); |
1316 | *result = le64_to_cpu(disk_super->held_root); | |
1317 | ||
1318 | return dm_bm_unlock(sblock); | |
1319 | } | |
1320 | ||
cc8394d8 JT |
1321 | int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd, |
1322 | dm_block_t *result) | |
991d9fa0 | 1323 | { |
da105ed5 | 1324 | int r = -EINVAL; |
991d9fa0 JT |
1325 | |
1326 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1327 | if (!pmd->fail_io) |
1328 | r = __get_metadata_snap(pmd, result); | |
991d9fa0 JT |
1329 | up_read(&pmd->root_lock); |
1330 | ||
1331 | return r; | |
1332 | } | |
1333 | ||
1334 | int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, | |
1335 | struct dm_thin_device **td) | |
1336 | { | |
da105ed5 | 1337 | int r = -EINVAL; |
991d9fa0 JT |
1338 | |
1339 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1340 | if (!pmd->fail_io) |
1341 | r = __open_device(pmd, dev, 0, td); | |
991d9fa0 JT |
1342 | up_write(&pmd->root_lock); |
1343 | ||
1344 | return r; | |
1345 | } | |
1346 | ||
1347 | int dm_pool_close_thin_device(struct dm_thin_device *td) | |
1348 | { | |
1349 | down_write(&td->pmd->root_lock); | |
1350 | __close_device(td); | |
1351 | up_write(&td->pmd->root_lock); | |
1352 | ||
1353 | return 0; | |
1354 | } | |
1355 | ||
1356 | dm_thin_id dm_thin_dev_id(struct dm_thin_device *td) | |
1357 | { | |
1358 | return td->id; | |
1359 | } | |
1360 | ||
614319df JT |
1361 | /* |
1362 | * Check whether @time (of block creation) is older than @td's last snapshot. | |
1363 | * If so then the associated block is shared with the last snapshot device. | |
1364 | * Any block on a device created *after* the device last got snapshotted is | |
1365 | * necessarily not shared. | |
1366 | */ | |
17b7d63f | 1367 | static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time) |
991d9fa0 JT |
1368 | { |
1369 | return td->snapshotted_time > time; | |
1370 | } | |
1371 | ||
1372 | int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, | |
1373 | int can_block, struct dm_thin_lookup_result *result) | |
1374 | { | |
da105ed5 | 1375 | int r = -EINVAL; |
991d9fa0 JT |
1376 | uint64_t block_time = 0; |
1377 | __le64 value; | |
1378 | struct dm_pool_metadata *pmd = td->pmd; | |
1379 | dm_block_t keys[2] = { td->id, block }; | |
da105ed5 | 1380 | struct dm_btree_info *info; |
991d9fa0 JT |
1381 | |
1382 | if (can_block) { | |
1383 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1384 | info = &pmd->info; |
1385 | } else if (down_read_trylock(&pmd->root_lock)) | |
1386 | info = &pmd->nb_info; | |
1387 | else | |
991d9fa0 JT |
1388 | return -EWOULDBLOCK; |
1389 | ||
da105ed5 JT |
1390 | if (pmd->fail_io) |
1391 | goto out; | |
1392 | ||
1393 | r = dm_btree_lookup(info, pmd->root, keys, &value); | |
1394 | if (!r) | |
1395 | block_time = le64_to_cpu(value); | |
1396 | ||
1397 | out: | |
1398 | up_read(&pmd->root_lock); | |
1399 | ||
991d9fa0 JT |
1400 | if (!r) { |
1401 | dm_block_t exception_block; | |
1402 | uint32_t exception_time; | |
1403 | unpack_block_time(block_time, &exception_block, | |
1404 | &exception_time); | |
1405 | result->block = exception_block; | |
1406 | result->shared = __snapshotted_since(td, exception_time); | |
1407 | } | |
1408 | ||
1409 | return r; | |
1410 | } | |
1411 | ||
1412 | static int __insert(struct dm_thin_device *td, dm_block_t block, | |
1413 | dm_block_t data_block) | |
1414 | { | |
1415 | int r, inserted; | |
1416 | __le64 value; | |
1417 | struct dm_pool_metadata *pmd = td->pmd; | |
1418 | dm_block_t keys[2] = { td->id, block }; | |
1419 | ||
991d9fa0 JT |
1420 | value = cpu_to_le64(pack_block_time(data_block, pmd->time)); |
1421 | __dm_bless_for_disk(&value); | |
1422 | ||
1423 | r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value, | |
1424 | &pmd->root, &inserted); | |
1425 | if (r) | |
1426 | return r; | |
1427 | ||
40db5a53 JT |
1428 | td->changed = 1; |
1429 | if (inserted) | |
991d9fa0 | 1430 | td->mapped_blocks++; |
991d9fa0 JT |
1431 | |
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, | |
1436 | dm_block_t data_block) | |
1437 | { | |
da105ed5 | 1438 | int r = -EINVAL; |
991d9fa0 JT |
1439 | |
1440 | down_write(&td->pmd->root_lock); | |
da105ed5 JT |
1441 | if (!td->pmd->fail_io) |
1442 | r = __insert(td, block, data_block); | |
991d9fa0 JT |
1443 | up_write(&td->pmd->root_lock); |
1444 | ||
1445 | return r; | |
1446 | } | |
1447 | ||
1448 | static int __remove(struct dm_thin_device *td, dm_block_t block) | |
1449 | { | |
1450 | int r; | |
1451 | struct dm_pool_metadata *pmd = td->pmd; | |
1452 | dm_block_t keys[2] = { td->id, block }; | |
1453 | ||
1454 | r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root); | |
1455 | if (r) | |
1456 | return r; | |
1457 | ||
af63bcb8 JT |
1458 | td->mapped_blocks--; |
1459 | td->changed = 1; | |
991d9fa0 JT |
1460 | |
1461 | return 0; | |
1462 | } | |
1463 | ||
1464 | int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) | |
1465 | { | |
da105ed5 | 1466 | int r = -EINVAL; |
991d9fa0 JT |
1467 | |
1468 | down_write(&td->pmd->root_lock); | |
da105ed5 JT |
1469 | if (!td->pmd->fail_io) |
1470 | r = __remove(td, block); | |
991d9fa0 JT |
1471 | up_write(&td->pmd->root_lock); |
1472 | ||
1473 | return r; | |
1474 | } | |
1475 | ||
614319df JT |
1476 | int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) |
1477 | { | |
1478 | int r; | |
1479 | uint32_t ref_count; | |
1480 | ||
1481 | down_read(&pmd->root_lock); | |
1482 | r = dm_sm_get_count(pmd->data_sm, b, &ref_count); | |
1483 | if (!r) | |
1484 | *result = (ref_count != 0); | |
1485 | up_read(&pmd->root_lock); | |
1486 | ||
1487 | return r; | |
1488 | } | |
1489 | ||
40db5a53 JT |
1490 | bool dm_thin_changed_this_transaction(struct dm_thin_device *td) |
1491 | { | |
1492 | int r; | |
1493 | ||
1494 | down_read(&td->pmd->root_lock); | |
1495 | r = td->changed; | |
1496 | up_read(&td->pmd->root_lock); | |
1497 | ||
1498 | return r; | |
1499 | } | |
1500 | ||
4f48d332 MS |
1501 | bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd) |
1502 | { | |
1503 | bool r = false; | |
1504 | struct dm_thin_device *td, *tmp; | |
1505 | ||
1506 | down_read(&pmd->root_lock); | |
1507 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
1508 | if (td->changed) { | |
1509 | r = td->changed; | |
1510 | break; | |
1511 | } | |
1512 | } | |
1513 | up_read(&pmd->root_lock); | |
1514 | ||
1515 | return r; | |
1516 | } | |
1517 | ||
da105ed5 JT |
1518 | bool dm_thin_aborted_changes(struct dm_thin_device *td) |
1519 | { | |
1520 | bool r; | |
1521 | ||
1522 | down_read(&td->pmd->root_lock); | |
1523 | r = td->aborted_with_changes; | |
1524 | up_read(&td->pmd->root_lock); | |
1525 | ||
1526 | return r; | |
1527 | } | |
1528 | ||
991d9fa0 JT |
1529 | int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result) |
1530 | { | |
da105ed5 | 1531 | int r = -EINVAL; |
991d9fa0 JT |
1532 | |
1533 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1534 | if (!pmd->fail_io) |
1535 | r = dm_sm_new_block(pmd->data_sm, result); | |
991d9fa0 JT |
1536 | up_write(&pmd->root_lock); |
1537 | ||
1538 | return r; | |
1539 | } | |
1540 | ||
1541 | int dm_pool_commit_metadata(struct dm_pool_metadata *pmd) | |
1542 | { | |
da105ed5 | 1543 | int r = -EINVAL; |
991d9fa0 JT |
1544 | |
1545 | down_write(&pmd->root_lock); | |
da105ed5 JT |
1546 | if (pmd->fail_io) |
1547 | goto out; | |
991d9fa0 JT |
1548 | |
1549 | r = __commit_transaction(pmd); | |
1550 | if (r <= 0) | |
1551 | goto out; | |
1552 | ||
1553 | /* | |
1554 | * Open the next transaction. | |
1555 | */ | |
1556 | r = __begin_transaction(pmd); | |
1557 | out: | |
1558 | up_write(&pmd->root_lock); | |
1559 | return r; | |
1560 | } | |
1561 | ||
da105ed5 JT |
1562 | static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd) |
1563 | { | |
1564 | struct dm_thin_device *td; | |
1565 | ||
1566 | list_for_each_entry(td, &pmd->thin_devices, list) | |
1567 | td->aborted_with_changes = td->changed; | |
1568 | } | |
1569 | ||
1570 | int dm_pool_abort_metadata(struct dm_pool_metadata *pmd) | |
1571 | { | |
1572 | int r = -EINVAL; | |
1573 | ||
1574 | down_write(&pmd->root_lock); | |
1575 | if (pmd->fail_io) | |
1576 | goto out; | |
1577 | ||
1578 | __set_abort_with_changes_flags(pmd); | |
1579 | __destroy_persistent_data_objects(pmd); | |
1580 | r = __create_persistent_data_objects(pmd, false); | |
1581 | if (r) | |
1582 | pmd->fail_io = true; | |
1583 | ||
1584 | out: | |
1585 | up_write(&pmd->root_lock); | |
1586 | ||
1587 | return r; | |
1588 | } | |
1589 | ||
991d9fa0 JT |
1590 | int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result) |
1591 | { | |
da105ed5 | 1592 | int r = -EINVAL; |
991d9fa0 JT |
1593 | |
1594 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1595 | if (!pmd->fail_io) |
1596 | r = dm_sm_get_nr_free(pmd->data_sm, result); | |
991d9fa0 JT |
1597 | up_read(&pmd->root_lock); |
1598 | ||
1599 | return r; | |
1600 | } | |
1601 | ||
1602 | int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, | |
1603 | dm_block_t *result) | |
1604 | { | |
da105ed5 | 1605 | int r = -EINVAL; |
991d9fa0 JT |
1606 | |
1607 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1608 | if (!pmd->fail_io) |
1609 | r = dm_sm_get_nr_free(pmd->metadata_sm, result); | |
991d9fa0 JT |
1610 | up_read(&pmd->root_lock); |
1611 | ||
1612 | return r; | |
1613 | } | |
1614 | ||
1615 | int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, | |
1616 | dm_block_t *result) | |
1617 | { | |
da105ed5 | 1618 | int r = -EINVAL; |
991d9fa0 JT |
1619 | |
1620 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1621 | if (!pmd->fail_io) |
1622 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, result); | |
991d9fa0 JT |
1623 | up_read(&pmd->root_lock); |
1624 | ||
1625 | return r; | |
1626 | } | |
1627 | ||
1628 | int dm_pool_get_data_block_size(struct dm_pool_metadata *pmd, sector_t *result) | |
1629 | { | |
1630 | down_read(&pmd->root_lock); | |
1631 | *result = pmd->data_block_size; | |
1632 | up_read(&pmd->root_lock); | |
1633 | ||
1634 | return 0; | |
1635 | } | |
1636 | ||
1637 | int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result) | |
1638 | { | |
da105ed5 | 1639 | int r = -EINVAL; |
991d9fa0 JT |
1640 | |
1641 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1642 | if (!pmd->fail_io) |
1643 | r = dm_sm_get_nr_blocks(pmd->data_sm, result); | |
991d9fa0 JT |
1644 | up_read(&pmd->root_lock); |
1645 | ||
1646 | return r; | |
1647 | } | |
1648 | ||
1649 | int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result) | |
1650 | { | |
da105ed5 | 1651 | int r = -EINVAL; |
991d9fa0 JT |
1652 | struct dm_pool_metadata *pmd = td->pmd; |
1653 | ||
1654 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1655 | if (!pmd->fail_io) { |
1656 | *result = td->mapped_blocks; | |
1657 | r = 0; | |
1658 | } | |
991d9fa0 JT |
1659 | up_read(&pmd->root_lock); |
1660 | ||
da105ed5 | 1661 | return r; |
991d9fa0 JT |
1662 | } |
1663 | ||
1664 | static int __highest_block(struct dm_thin_device *td, dm_block_t *result) | |
1665 | { | |
1666 | int r; | |
1667 | __le64 value_le; | |
1668 | dm_block_t thin_root; | |
1669 | struct dm_pool_metadata *pmd = td->pmd; | |
1670 | ||
1671 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le); | |
1672 | if (r) | |
1673 | return r; | |
1674 | ||
1675 | thin_root = le64_to_cpu(value_le); | |
1676 | ||
1677 | return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result); | |
1678 | } | |
1679 | ||
1680 | int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, | |
1681 | dm_block_t *result) | |
1682 | { | |
da105ed5 | 1683 | int r = -EINVAL; |
991d9fa0 JT |
1684 | struct dm_pool_metadata *pmd = td->pmd; |
1685 | ||
1686 | down_read(&pmd->root_lock); | |
da105ed5 JT |
1687 | if (!pmd->fail_io) |
1688 | r = __highest_block(td, result); | |
991d9fa0 JT |
1689 | up_read(&pmd->root_lock); |
1690 | ||
1691 | return r; | |
1692 | } | |
1693 | ||
b17446df | 1694 | static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count) |
991d9fa0 JT |
1695 | { |
1696 | int r; | |
1697 | dm_block_t old_count; | |
1698 | ||
b17446df | 1699 | r = dm_sm_get_nr_blocks(sm, &old_count); |
991d9fa0 JT |
1700 | if (r) |
1701 | return r; | |
1702 | ||
1703 | if (new_count == old_count) | |
1704 | return 0; | |
1705 | ||
1706 | if (new_count < old_count) { | |
b17446df | 1707 | DMERR("cannot reduce size of space map"); |
991d9fa0 JT |
1708 | return -EINVAL; |
1709 | } | |
1710 | ||
b17446df | 1711 | return dm_sm_extend(sm, new_count - old_count); |
991d9fa0 JT |
1712 | } |
1713 | ||
1714 | int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) | |
1715 | { | |
da105ed5 | 1716 | int r = -EINVAL; |
991d9fa0 JT |
1717 | |
1718 | down_write(&pmd->root_lock); | |
da105ed5 | 1719 | if (!pmd->fail_io) |
b17446df | 1720 | r = __resize_space_map(pmd->data_sm, new_count); |
991d9fa0 JT |
1721 | up_write(&pmd->root_lock); |
1722 | ||
1723 | return r; | |
1724 | } | |
12ba58af | 1725 | |
24347e95 JT |
1726 | int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) |
1727 | { | |
1728 | int r = -EINVAL; | |
1729 | ||
1730 | down_write(&pmd->root_lock); | |
1731 | if (!pmd->fail_io) | |
1732 | r = __resize_space_map(pmd->metadata_sm, new_count); | |
1733 | up_write(&pmd->root_lock); | |
1734 | ||
1735 | return r; | |
1736 | } | |
1737 | ||
12ba58af JT |
1738 | void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) |
1739 | { | |
1740 | down_write(&pmd->root_lock); | |
1741 | pmd->read_only = true; | |
1742 | dm_bm_set_read_only(pmd->bm); | |
1743 | up_write(&pmd->root_lock); | |
1744 | } | |
ac8c3f3d JT |
1745 | |
1746 | int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, | |
1747 | dm_block_t threshold, | |
1748 | dm_sm_threshold_fn fn, | |
1749 | void *context) | |
1750 | { | |
1751 | int r; | |
1752 | ||
1753 | down_write(&pmd->root_lock); | |
1754 | r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context); | |
1755 | up_write(&pmd->root_lock); | |
1756 | ||
1757 | return r; | |
1758 | } |