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991d9fa0 JT |
1 | /* |
2 | * Copyright (C) 2011 Red Hat, Inc. | |
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 | ||
83 | /* This should be plenty */ | |
84 | #define SPACE_MAP_ROOT_SIZE 128 | |
85 | ||
86 | /* | |
87 | * Little endian on-disk superblock and device details. | |
88 | */ | |
89 | struct thin_disk_superblock { | |
90 | __le32 csum; /* Checksum of superblock except for this field. */ | |
91 | __le32 flags; | |
92 | __le64 blocknr; /* This block number, dm_block_t. */ | |
93 | ||
94 | __u8 uuid[16]; | |
95 | __le64 magic; | |
96 | __le32 version; | |
97 | __le32 time; | |
98 | ||
99 | __le64 trans_id; | |
100 | ||
101 | /* | |
102 | * Root held by userspace transactions. | |
103 | */ | |
104 | __le64 held_root; | |
105 | ||
106 | __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
107 | __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; | |
108 | ||
109 | /* | |
110 | * 2-level btree mapping (dev_id, (dev block, time)) -> data block | |
111 | */ | |
112 | __le64 data_mapping_root; | |
113 | ||
114 | /* | |
115 | * Device detail root mapping dev_id -> device_details | |
116 | */ | |
117 | __le64 device_details_root; | |
118 | ||
119 | __le32 data_block_size; /* In 512-byte sectors. */ | |
120 | ||
121 | __le32 metadata_block_size; /* In 512-byte sectors. */ | |
122 | __le64 metadata_nr_blocks; | |
123 | ||
124 | __le32 compat_flags; | |
125 | __le32 compat_ro_flags; | |
126 | __le32 incompat_flags; | |
127 | } __packed; | |
128 | ||
129 | struct disk_device_details { | |
130 | __le64 mapped_blocks; | |
131 | __le64 transaction_id; /* When created. */ | |
132 | __le32 creation_time; | |
133 | __le32 snapshotted_time; | |
134 | } __packed; | |
135 | ||
136 | struct dm_pool_metadata { | |
137 | struct hlist_node hash; | |
138 | ||
139 | struct block_device *bdev; | |
140 | struct dm_block_manager *bm; | |
141 | struct dm_space_map *metadata_sm; | |
142 | struct dm_space_map *data_sm; | |
143 | struct dm_transaction_manager *tm; | |
144 | struct dm_transaction_manager *nb_tm; | |
145 | ||
146 | /* | |
147 | * Two-level btree. | |
148 | * First level holds thin_dev_t. | |
149 | * Second level holds mappings. | |
150 | */ | |
151 | struct dm_btree_info info; | |
152 | ||
153 | /* | |
154 | * Non-blocking version of the above. | |
155 | */ | |
156 | struct dm_btree_info nb_info; | |
157 | ||
158 | /* | |
159 | * Just the top level for deleting whole devices. | |
160 | */ | |
161 | struct dm_btree_info tl_info; | |
162 | ||
163 | /* | |
164 | * Just the bottom level for creating new devices. | |
165 | */ | |
166 | struct dm_btree_info bl_info; | |
167 | ||
168 | /* | |
169 | * Describes the device details btree. | |
170 | */ | |
171 | struct dm_btree_info details_info; | |
172 | ||
173 | struct rw_semaphore root_lock; | |
174 | uint32_t time; | |
175 | int need_commit; | |
176 | dm_block_t root; | |
177 | dm_block_t details_root; | |
178 | struct list_head thin_devices; | |
179 | uint64_t trans_id; | |
180 | unsigned long flags; | |
181 | sector_t data_block_size; | |
182 | }; | |
183 | ||
184 | struct dm_thin_device { | |
185 | struct list_head list; | |
186 | struct dm_pool_metadata *pmd; | |
187 | dm_thin_id id; | |
188 | ||
189 | int open_count; | |
190 | int changed; | |
191 | uint64_t mapped_blocks; | |
192 | uint64_t transaction_id; | |
193 | uint32_t creation_time; | |
194 | uint32_t snapshotted_time; | |
195 | }; | |
196 | ||
197 | /*---------------------------------------------------------------- | |
198 | * superblock validator | |
199 | *--------------------------------------------------------------*/ | |
200 | ||
201 | #define SUPERBLOCK_CSUM_XOR 160774 | |
202 | ||
203 | static void sb_prepare_for_write(struct dm_block_validator *v, | |
204 | struct dm_block *b, | |
205 | size_t block_size) | |
206 | { | |
207 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
208 | ||
209 | disk_super->blocknr = cpu_to_le64(dm_block_location(b)); | |
210 | disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
211 | block_size - sizeof(__le32), | |
212 | SUPERBLOCK_CSUM_XOR)); | |
213 | } | |
214 | ||
215 | static int sb_check(struct dm_block_validator *v, | |
216 | struct dm_block *b, | |
217 | size_t block_size) | |
218 | { | |
219 | struct thin_disk_superblock *disk_super = dm_block_data(b); | |
220 | __le32 csum_le; | |
221 | ||
222 | if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) { | |
223 | DMERR("sb_check failed: blocknr %llu: " | |
224 | "wanted %llu", le64_to_cpu(disk_super->blocknr), | |
225 | (unsigned long long)dm_block_location(b)); | |
226 | return -ENOTBLK; | |
227 | } | |
228 | ||
229 | if (le64_to_cpu(disk_super->magic) != THIN_SUPERBLOCK_MAGIC) { | |
230 | DMERR("sb_check failed: magic %llu: " | |
231 | "wanted %llu", le64_to_cpu(disk_super->magic), | |
232 | (unsigned long long)THIN_SUPERBLOCK_MAGIC); | |
233 | return -EILSEQ; | |
234 | } | |
235 | ||
236 | csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags, | |
237 | block_size - sizeof(__le32), | |
238 | SUPERBLOCK_CSUM_XOR)); | |
239 | if (csum_le != disk_super->csum) { | |
240 | DMERR("sb_check failed: csum %u: wanted %u", | |
241 | le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum)); | |
242 | return -EILSEQ; | |
243 | } | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | static struct dm_block_validator sb_validator = { | |
249 | .name = "superblock", | |
250 | .prepare_for_write = sb_prepare_for_write, | |
251 | .check = sb_check | |
252 | }; | |
253 | ||
254 | /*---------------------------------------------------------------- | |
255 | * Methods for the btree value types | |
256 | *--------------------------------------------------------------*/ | |
257 | ||
258 | static uint64_t pack_block_time(dm_block_t b, uint32_t t) | |
259 | { | |
260 | return (b << 24) | t; | |
261 | } | |
262 | ||
263 | static void unpack_block_time(uint64_t v, dm_block_t *b, uint32_t *t) | |
264 | { | |
265 | *b = v >> 24; | |
266 | *t = v & ((1 << 24) - 1); | |
267 | } | |
268 | ||
269 | static void data_block_inc(void *context, void *value_le) | |
270 | { | |
271 | struct dm_space_map *sm = context; | |
272 | __le64 v_le; | |
273 | uint64_t b; | |
274 | uint32_t t; | |
275 | ||
276 | memcpy(&v_le, value_le, sizeof(v_le)); | |
277 | unpack_block_time(le64_to_cpu(v_le), &b, &t); | |
278 | dm_sm_inc_block(sm, b); | |
279 | } | |
280 | ||
281 | static void data_block_dec(void *context, void *value_le) | |
282 | { | |
283 | struct dm_space_map *sm = context; | |
284 | __le64 v_le; | |
285 | uint64_t b; | |
286 | uint32_t t; | |
287 | ||
288 | memcpy(&v_le, value_le, sizeof(v_le)); | |
289 | unpack_block_time(le64_to_cpu(v_le), &b, &t); | |
290 | dm_sm_dec_block(sm, b); | |
291 | } | |
292 | ||
293 | static int data_block_equal(void *context, void *value1_le, void *value2_le) | |
294 | { | |
295 | __le64 v1_le, v2_le; | |
296 | uint64_t b1, b2; | |
297 | uint32_t t; | |
298 | ||
299 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
300 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
301 | unpack_block_time(le64_to_cpu(v1_le), &b1, &t); | |
302 | unpack_block_time(le64_to_cpu(v2_le), &b2, &t); | |
303 | ||
304 | return b1 == b2; | |
305 | } | |
306 | ||
307 | static void subtree_inc(void *context, void *value) | |
308 | { | |
309 | struct dm_btree_info *info = context; | |
310 | __le64 root_le; | |
311 | uint64_t root; | |
312 | ||
313 | memcpy(&root_le, value, sizeof(root_le)); | |
314 | root = le64_to_cpu(root_le); | |
315 | dm_tm_inc(info->tm, root); | |
316 | } | |
317 | ||
318 | static void subtree_dec(void *context, void *value) | |
319 | { | |
320 | struct dm_btree_info *info = context; | |
321 | __le64 root_le; | |
322 | uint64_t root; | |
323 | ||
324 | memcpy(&root_le, value, sizeof(root_le)); | |
325 | root = le64_to_cpu(root_le); | |
326 | if (dm_btree_del(info, root)) | |
327 | DMERR("btree delete failed\n"); | |
328 | } | |
329 | ||
330 | static int subtree_equal(void *context, void *value1_le, void *value2_le) | |
331 | { | |
332 | __le64 v1_le, v2_le; | |
333 | memcpy(&v1_le, value1_le, sizeof(v1_le)); | |
334 | memcpy(&v2_le, value2_le, sizeof(v2_le)); | |
335 | ||
336 | return v1_le == v2_le; | |
337 | } | |
338 | ||
339 | /*----------------------------------------------------------------*/ | |
340 | ||
341 | static int superblock_all_zeroes(struct dm_block_manager *bm, int *result) | |
342 | { | |
343 | int r; | |
344 | unsigned i; | |
345 | struct dm_block *b; | |
346 | __le64 *data_le, zero = cpu_to_le64(0); | |
347 | unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64); | |
348 | ||
349 | /* | |
350 | * We can't use a validator here - it may be all zeroes. | |
351 | */ | |
352 | r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b); | |
353 | if (r) | |
354 | return r; | |
355 | ||
356 | data_le = dm_block_data(b); | |
357 | *result = 1; | |
358 | for (i = 0; i < block_size; i++) { | |
359 | if (data_le[i] != zero) { | |
360 | *result = 0; | |
361 | break; | |
362 | } | |
363 | } | |
364 | ||
365 | return dm_bm_unlock(b); | |
366 | } | |
367 | ||
368 | static int init_pmd(struct dm_pool_metadata *pmd, | |
369 | struct dm_block_manager *bm, | |
370 | dm_block_t nr_blocks, int create) | |
371 | { | |
372 | int r; | |
373 | struct dm_space_map *sm, *data_sm; | |
374 | struct dm_transaction_manager *tm; | |
375 | struct dm_block *sblock; | |
376 | ||
377 | if (create) { | |
378 | r = dm_tm_create_with_sm(bm, THIN_SUPERBLOCK_LOCATION, | |
379 | &sb_validator, &tm, &sm, &sblock); | |
380 | if (r < 0) { | |
381 | DMERR("tm_create_with_sm failed"); | |
382 | return r; | |
383 | } | |
384 | ||
385 | data_sm = dm_sm_disk_create(tm, nr_blocks); | |
386 | if (IS_ERR(data_sm)) { | |
387 | DMERR("sm_disk_create failed"); | |
388 | r = PTR_ERR(data_sm); | |
389 | goto bad; | |
390 | } | |
391 | } else { | |
392 | struct thin_disk_superblock *disk_super = NULL; | |
393 | size_t space_map_root_offset = | |
394 | offsetof(struct thin_disk_superblock, metadata_space_map_root); | |
395 | ||
396 | r = dm_tm_open_with_sm(bm, THIN_SUPERBLOCK_LOCATION, | |
397 | &sb_validator, space_map_root_offset, | |
398 | SPACE_MAP_ROOT_SIZE, &tm, &sm, &sblock); | |
399 | if (r < 0) { | |
400 | DMERR("tm_open_with_sm failed"); | |
401 | return r; | |
402 | } | |
403 | ||
404 | disk_super = dm_block_data(sblock); | |
405 | data_sm = dm_sm_disk_open(tm, disk_super->data_space_map_root, | |
406 | sizeof(disk_super->data_space_map_root)); | |
407 | if (IS_ERR(data_sm)) { | |
408 | DMERR("sm_disk_open failed"); | |
409 | r = PTR_ERR(data_sm); | |
410 | goto bad; | |
411 | } | |
412 | } | |
413 | ||
414 | ||
415 | r = dm_tm_unlock(tm, sblock); | |
416 | if (r < 0) { | |
417 | DMERR("couldn't unlock superblock"); | |
418 | goto bad_data_sm; | |
419 | } | |
420 | ||
421 | pmd->bm = bm; | |
422 | pmd->metadata_sm = sm; | |
423 | pmd->data_sm = data_sm; | |
424 | pmd->tm = tm; | |
425 | pmd->nb_tm = dm_tm_create_non_blocking_clone(tm); | |
426 | if (!pmd->nb_tm) { | |
427 | DMERR("could not create clone tm"); | |
428 | r = -ENOMEM; | |
429 | goto bad_data_sm; | |
430 | } | |
431 | ||
432 | pmd->info.tm = tm; | |
433 | pmd->info.levels = 2; | |
434 | pmd->info.value_type.context = pmd->data_sm; | |
435 | pmd->info.value_type.size = sizeof(__le64); | |
436 | pmd->info.value_type.inc = data_block_inc; | |
437 | pmd->info.value_type.dec = data_block_dec; | |
438 | pmd->info.value_type.equal = data_block_equal; | |
439 | ||
440 | memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info)); | |
441 | pmd->nb_info.tm = pmd->nb_tm; | |
442 | ||
443 | pmd->tl_info.tm = tm; | |
444 | pmd->tl_info.levels = 1; | |
445 | pmd->tl_info.value_type.context = &pmd->info; | |
446 | pmd->tl_info.value_type.size = sizeof(__le64); | |
447 | pmd->tl_info.value_type.inc = subtree_inc; | |
448 | pmd->tl_info.value_type.dec = subtree_dec; | |
449 | pmd->tl_info.value_type.equal = subtree_equal; | |
450 | ||
451 | pmd->bl_info.tm = tm; | |
452 | pmd->bl_info.levels = 1; | |
453 | pmd->bl_info.value_type.context = pmd->data_sm; | |
454 | pmd->bl_info.value_type.size = sizeof(__le64); | |
455 | pmd->bl_info.value_type.inc = data_block_inc; | |
456 | pmd->bl_info.value_type.dec = data_block_dec; | |
457 | pmd->bl_info.value_type.equal = data_block_equal; | |
458 | ||
459 | pmd->details_info.tm = tm; | |
460 | pmd->details_info.levels = 1; | |
461 | pmd->details_info.value_type.context = NULL; | |
462 | pmd->details_info.value_type.size = sizeof(struct disk_device_details); | |
463 | pmd->details_info.value_type.inc = NULL; | |
464 | pmd->details_info.value_type.dec = NULL; | |
465 | pmd->details_info.value_type.equal = NULL; | |
466 | ||
467 | pmd->root = 0; | |
468 | ||
469 | init_rwsem(&pmd->root_lock); | |
470 | pmd->time = 0; | |
471 | pmd->need_commit = 0; | |
472 | pmd->details_root = 0; | |
473 | pmd->trans_id = 0; | |
474 | pmd->flags = 0; | |
475 | INIT_LIST_HEAD(&pmd->thin_devices); | |
476 | ||
477 | return 0; | |
478 | ||
479 | bad_data_sm: | |
480 | dm_sm_destroy(data_sm); | |
481 | bad: | |
482 | dm_tm_destroy(tm); | |
483 | dm_sm_destroy(sm); | |
484 | ||
485 | return r; | |
486 | } | |
487 | ||
488 | static int __begin_transaction(struct dm_pool_metadata *pmd) | |
489 | { | |
490 | int r; | |
491 | u32 features; | |
492 | struct thin_disk_superblock *disk_super; | |
493 | struct dm_block *sblock; | |
494 | ||
495 | /* | |
496 | * __maybe_commit_transaction() resets these | |
497 | */ | |
498 | WARN_ON(pmd->need_commit); | |
499 | ||
500 | /* | |
501 | * We re-read the superblock every time. Shouldn't need to do this | |
502 | * really. | |
503 | */ | |
504 | r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
505 | &sb_validator, &sblock); | |
506 | if (r) | |
507 | return r; | |
508 | ||
509 | disk_super = dm_block_data(sblock); | |
510 | pmd->time = le32_to_cpu(disk_super->time); | |
511 | pmd->root = le64_to_cpu(disk_super->data_mapping_root); | |
512 | pmd->details_root = le64_to_cpu(disk_super->device_details_root); | |
513 | pmd->trans_id = le64_to_cpu(disk_super->trans_id); | |
514 | pmd->flags = le32_to_cpu(disk_super->flags); | |
515 | pmd->data_block_size = le32_to_cpu(disk_super->data_block_size); | |
516 | ||
517 | features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP; | |
518 | if (features) { | |
519 | DMERR("could not access metadata due to " | |
520 | "unsupported optional features (%lx).", | |
521 | (unsigned long)features); | |
522 | r = -EINVAL; | |
523 | goto out; | |
524 | } | |
525 | ||
526 | /* | |
527 | * Check for read-only metadata to skip the following RDWR checks. | |
528 | */ | |
529 | if (get_disk_ro(pmd->bdev->bd_disk)) | |
530 | goto out; | |
531 | ||
532 | features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP; | |
533 | if (features) { | |
534 | DMERR("could not access metadata RDWR due to " | |
535 | "unsupported optional features (%lx).", | |
536 | (unsigned long)features); | |
537 | r = -EINVAL; | |
538 | } | |
539 | ||
540 | out: | |
541 | dm_bm_unlock(sblock); | |
542 | return r; | |
543 | } | |
544 | ||
545 | static int __write_changed_details(struct dm_pool_metadata *pmd) | |
546 | { | |
547 | int r; | |
548 | struct dm_thin_device *td, *tmp; | |
549 | struct disk_device_details details; | |
550 | uint64_t key; | |
551 | ||
552 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
553 | if (!td->changed) | |
554 | continue; | |
555 | ||
556 | key = td->id; | |
557 | ||
558 | details.mapped_blocks = cpu_to_le64(td->mapped_blocks); | |
559 | details.transaction_id = cpu_to_le64(td->transaction_id); | |
560 | details.creation_time = cpu_to_le32(td->creation_time); | |
561 | details.snapshotted_time = cpu_to_le32(td->snapshotted_time); | |
562 | __dm_bless_for_disk(&details); | |
563 | ||
564 | r = dm_btree_insert(&pmd->details_info, pmd->details_root, | |
565 | &key, &details, &pmd->details_root); | |
566 | if (r) | |
567 | return r; | |
568 | ||
569 | if (td->open_count) | |
570 | td->changed = 0; | |
571 | else { | |
572 | list_del(&td->list); | |
573 | kfree(td); | |
574 | } | |
575 | ||
576 | pmd->need_commit = 1; | |
577 | } | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | static int __commit_transaction(struct dm_pool_metadata *pmd) | |
583 | { | |
584 | /* | |
585 | * FIXME: Associated pool should be made read-only on failure. | |
586 | */ | |
587 | int r; | |
588 | size_t metadata_len, data_len; | |
589 | struct thin_disk_superblock *disk_super; | |
590 | struct dm_block *sblock; | |
591 | ||
592 | /* | |
593 | * We need to know if the thin_disk_superblock exceeds a 512-byte sector. | |
594 | */ | |
595 | BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512); | |
596 | ||
597 | r = __write_changed_details(pmd); | |
598 | if (r < 0) | |
599 | goto out; | |
600 | ||
601 | if (!pmd->need_commit) | |
602 | goto out; | |
603 | ||
604 | r = dm_sm_commit(pmd->data_sm); | |
605 | if (r < 0) | |
606 | goto out; | |
607 | ||
608 | r = dm_tm_pre_commit(pmd->tm); | |
609 | if (r < 0) | |
610 | goto out; | |
611 | ||
612 | r = dm_sm_root_size(pmd->metadata_sm, &metadata_len); | |
613 | if (r < 0) | |
614 | goto out; | |
615 | ||
616 | r = dm_sm_root_size(pmd->metadata_sm, &data_len); | |
617 | if (r < 0) | |
618 | goto out; | |
619 | ||
620 | r = dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
621 | &sb_validator, &sblock); | |
622 | if (r) | |
623 | goto out; | |
624 | ||
625 | disk_super = dm_block_data(sblock); | |
626 | disk_super->time = cpu_to_le32(pmd->time); | |
627 | disk_super->data_mapping_root = cpu_to_le64(pmd->root); | |
628 | disk_super->device_details_root = cpu_to_le64(pmd->details_root); | |
629 | disk_super->trans_id = cpu_to_le64(pmd->trans_id); | |
630 | disk_super->flags = cpu_to_le32(pmd->flags); | |
631 | ||
632 | r = dm_sm_copy_root(pmd->metadata_sm, &disk_super->metadata_space_map_root, | |
633 | metadata_len); | |
634 | if (r < 0) | |
635 | goto out_locked; | |
636 | ||
637 | r = dm_sm_copy_root(pmd->data_sm, &disk_super->data_space_map_root, | |
638 | data_len); | |
639 | if (r < 0) | |
640 | goto out_locked; | |
641 | ||
642 | r = dm_tm_commit(pmd->tm, sblock); | |
643 | if (!r) | |
644 | pmd->need_commit = 0; | |
645 | ||
646 | out: | |
647 | return r; | |
648 | ||
649 | out_locked: | |
650 | dm_bm_unlock(sblock); | |
651 | return r; | |
652 | } | |
653 | ||
654 | struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, | |
655 | sector_t data_block_size) | |
656 | { | |
657 | int r; | |
658 | struct thin_disk_superblock *disk_super; | |
659 | struct dm_pool_metadata *pmd; | |
660 | sector_t bdev_size = i_size_read(bdev->bd_inode) >> SECTOR_SHIFT; | |
661 | struct dm_block_manager *bm; | |
662 | int create; | |
663 | struct dm_block *sblock; | |
664 | ||
665 | pmd = kmalloc(sizeof(*pmd), GFP_KERNEL); | |
666 | if (!pmd) { | |
667 | DMERR("could not allocate metadata struct"); | |
668 | return ERR_PTR(-ENOMEM); | |
669 | } | |
670 | ||
671 | /* | |
672 | * Max hex locks: | |
673 | * 3 for btree insert + | |
674 | * 2 for btree lookup used within space map | |
675 | */ | |
676 | bm = dm_block_manager_create(bdev, THIN_METADATA_BLOCK_SIZE, | |
677 | THIN_METADATA_CACHE_SIZE, 5); | |
678 | if (!bm) { | |
679 | DMERR("could not create block manager"); | |
680 | kfree(pmd); | |
681 | return ERR_PTR(-ENOMEM); | |
682 | } | |
683 | ||
684 | r = superblock_all_zeroes(bm, &create); | |
685 | if (r) { | |
686 | dm_block_manager_destroy(bm); | |
687 | kfree(pmd); | |
688 | return ERR_PTR(r); | |
689 | } | |
690 | ||
691 | ||
692 | r = init_pmd(pmd, bm, 0, create); | |
693 | if (r) { | |
694 | dm_block_manager_destroy(bm); | |
695 | kfree(pmd); | |
696 | return ERR_PTR(r); | |
697 | } | |
698 | pmd->bdev = bdev; | |
699 | ||
700 | if (!create) { | |
701 | r = __begin_transaction(pmd); | |
702 | if (r < 0) | |
703 | goto bad; | |
704 | return pmd; | |
705 | } | |
706 | ||
707 | /* | |
708 | * Create. | |
709 | */ | |
710 | r = dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
711 | &sb_validator, &sblock); | |
712 | if (r) | |
713 | goto bad; | |
714 | ||
715 | disk_super = dm_block_data(sblock); | |
716 | disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC); | |
717 | disk_super->version = cpu_to_le32(THIN_VERSION); | |
718 | disk_super->time = 0; | |
719 | disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE >> SECTOR_SHIFT); | |
720 | disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT); | |
721 | disk_super->data_block_size = cpu_to_le32(data_block_size); | |
722 | ||
723 | r = dm_bm_unlock(sblock); | |
724 | if (r < 0) | |
725 | goto bad; | |
726 | ||
727 | r = dm_btree_empty(&pmd->info, &pmd->root); | |
728 | if (r < 0) | |
729 | goto bad; | |
730 | ||
731 | r = dm_btree_empty(&pmd->details_info, &pmd->details_root); | |
732 | if (r < 0) { | |
733 | DMERR("couldn't create devices root"); | |
734 | goto bad; | |
735 | } | |
736 | ||
737 | pmd->flags = 0; | |
738 | pmd->need_commit = 1; | |
739 | r = dm_pool_commit_metadata(pmd); | |
740 | if (r < 0) { | |
741 | DMERR("%s: dm_pool_commit_metadata() failed, error = %d", | |
742 | __func__, r); | |
743 | goto bad; | |
744 | } | |
745 | ||
746 | return pmd; | |
747 | ||
748 | bad: | |
749 | if (dm_pool_metadata_close(pmd) < 0) | |
750 | DMWARN("%s: dm_pool_metadata_close() failed.", __func__); | |
751 | return ERR_PTR(r); | |
752 | } | |
753 | ||
754 | int dm_pool_metadata_close(struct dm_pool_metadata *pmd) | |
755 | { | |
756 | int r; | |
757 | unsigned open_devices = 0; | |
758 | struct dm_thin_device *td, *tmp; | |
759 | ||
760 | down_read(&pmd->root_lock); | |
761 | list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { | |
762 | if (td->open_count) | |
763 | open_devices++; | |
764 | else { | |
765 | list_del(&td->list); | |
766 | kfree(td); | |
767 | } | |
768 | } | |
769 | up_read(&pmd->root_lock); | |
770 | ||
771 | if (open_devices) { | |
772 | DMERR("attempt to close pmd when %u device(s) are still open", | |
773 | open_devices); | |
774 | return -EBUSY; | |
775 | } | |
776 | ||
777 | r = __commit_transaction(pmd); | |
778 | if (r < 0) | |
779 | DMWARN("%s: __commit_transaction() failed, error = %d", | |
780 | __func__, r); | |
781 | ||
782 | dm_tm_destroy(pmd->tm); | |
783 | dm_tm_destroy(pmd->nb_tm); | |
784 | dm_block_manager_destroy(pmd->bm); | |
785 | dm_sm_destroy(pmd->metadata_sm); | |
786 | dm_sm_destroy(pmd->data_sm); | |
787 | kfree(pmd); | |
788 | ||
789 | return 0; | |
790 | } | |
791 | ||
792 | static int __open_device(struct dm_pool_metadata *pmd, | |
793 | dm_thin_id dev, int create, | |
794 | struct dm_thin_device **td) | |
795 | { | |
796 | int r, changed = 0; | |
797 | struct dm_thin_device *td2; | |
798 | uint64_t key = dev; | |
799 | struct disk_device_details details_le; | |
800 | ||
801 | /* | |
802 | * Check the device isn't already open. | |
803 | */ | |
804 | list_for_each_entry(td2, &pmd->thin_devices, list) | |
805 | if (td2->id == dev) { | |
806 | td2->open_count++; | |
807 | *td = td2; | |
808 | return 0; | |
809 | } | |
810 | ||
811 | /* | |
812 | * Check the device exists. | |
813 | */ | |
814 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
815 | &key, &details_le); | |
816 | if (r) { | |
817 | if (r != -ENODATA || !create) | |
818 | return r; | |
819 | ||
820 | changed = 1; | |
821 | details_le.mapped_blocks = 0; | |
822 | details_le.transaction_id = cpu_to_le64(pmd->trans_id); | |
823 | details_le.creation_time = cpu_to_le32(pmd->time); | |
824 | details_le.snapshotted_time = cpu_to_le32(pmd->time); | |
825 | } | |
826 | ||
827 | *td = kmalloc(sizeof(**td), GFP_NOIO); | |
828 | if (!*td) | |
829 | return -ENOMEM; | |
830 | ||
831 | (*td)->pmd = pmd; | |
832 | (*td)->id = dev; | |
833 | (*td)->open_count = 1; | |
834 | (*td)->changed = changed; | |
835 | (*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks); | |
836 | (*td)->transaction_id = le64_to_cpu(details_le.transaction_id); | |
837 | (*td)->creation_time = le32_to_cpu(details_le.creation_time); | |
838 | (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time); | |
839 | ||
840 | list_add(&(*td)->list, &pmd->thin_devices); | |
841 | ||
842 | return 0; | |
843 | } | |
844 | ||
845 | static void __close_device(struct dm_thin_device *td) | |
846 | { | |
847 | --td->open_count; | |
848 | } | |
849 | ||
850 | static int __create_thin(struct dm_pool_metadata *pmd, | |
851 | dm_thin_id dev) | |
852 | { | |
853 | int r; | |
854 | dm_block_t dev_root; | |
855 | uint64_t key = dev; | |
856 | struct disk_device_details details_le; | |
857 | struct dm_thin_device *td; | |
858 | __le64 value; | |
859 | ||
860 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
861 | &key, &details_le); | |
862 | if (!r) | |
863 | return -EEXIST; | |
864 | ||
865 | /* | |
866 | * Create an empty btree for the mappings. | |
867 | */ | |
868 | r = dm_btree_empty(&pmd->bl_info, &dev_root); | |
869 | if (r) | |
870 | return r; | |
871 | ||
872 | /* | |
873 | * Insert it into the main mapping tree. | |
874 | */ | |
875 | value = cpu_to_le64(dev_root); | |
876 | __dm_bless_for_disk(&value); | |
877 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
878 | if (r) { | |
879 | dm_btree_del(&pmd->bl_info, dev_root); | |
880 | return r; | |
881 | } | |
882 | ||
883 | r = __open_device(pmd, dev, 1, &td); | |
884 | if (r) { | |
885 | __close_device(td); | |
886 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); | |
887 | dm_btree_del(&pmd->bl_info, dev_root); | |
888 | return r; | |
889 | } | |
890 | td->changed = 1; | |
891 | __close_device(td); | |
892 | ||
893 | return r; | |
894 | } | |
895 | ||
896 | int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
897 | { | |
898 | int r; | |
899 | ||
900 | down_write(&pmd->root_lock); | |
901 | r = __create_thin(pmd, dev); | |
902 | up_write(&pmd->root_lock); | |
903 | ||
904 | return r; | |
905 | } | |
906 | ||
907 | static int __set_snapshot_details(struct dm_pool_metadata *pmd, | |
908 | struct dm_thin_device *snap, | |
909 | dm_thin_id origin, uint32_t time) | |
910 | { | |
911 | int r; | |
912 | struct dm_thin_device *td; | |
913 | ||
914 | r = __open_device(pmd, origin, 0, &td); | |
915 | if (r) | |
916 | return r; | |
917 | ||
918 | td->changed = 1; | |
919 | td->snapshotted_time = time; | |
920 | ||
921 | snap->mapped_blocks = td->mapped_blocks; | |
922 | snap->snapshotted_time = time; | |
923 | __close_device(td); | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
928 | static int __create_snap(struct dm_pool_metadata *pmd, | |
929 | dm_thin_id dev, dm_thin_id origin) | |
930 | { | |
931 | int r; | |
932 | dm_block_t origin_root; | |
933 | uint64_t key = origin, dev_key = dev; | |
934 | struct dm_thin_device *td; | |
935 | struct disk_device_details details_le; | |
936 | __le64 value; | |
937 | ||
938 | /* check this device is unused */ | |
939 | r = dm_btree_lookup(&pmd->details_info, pmd->details_root, | |
940 | &dev_key, &details_le); | |
941 | if (!r) | |
942 | return -EEXIST; | |
943 | ||
944 | /* find the mapping tree for the origin */ | |
945 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value); | |
946 | if (r) | |
947 | return r; | |
948 | origin_root = le64_to_cpu(value); | |
949 | ||
950 | /* clone the origin, an inc will do */ | |
951 | dm_tm_inc(pmd->tm, origin_root); | |
952 | ||
953 | /* insert into the main mapping tree */ | |
954 | value = cpu_to_le64(origin_root); | |
955 | __dm_bless_for_disk(&value); | |
956 | key = dev; | |
957 | r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); | |
958 | if (r) { | |
959 | dm_tm_dec(pmd->tm, origin_root); | |
960 | return r; | |
961 | } | |
962 | ||
963 | pmd->time++; | |
964 | ||
965 | r = __open_device(pmd, dev, 1, &td); | |
966 | if (r) | |
967 | goto bad; | |
968 | ||
969 | r = __set_snapshot_details(pmd, td, origin, pmd->time); | |
970 | if (r) | |
971 | goto bad; | |
972 | ||
973 | __close_device(td); | |
974 | return 0; | |
975 | ||
976 | bad: | |
977 | __close_device(td); | |
978 | dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); | |
979 | dm_btree_remove(&pmd->details_info, pmd->details_root, | |
980 | &key, &pmd->details_root); | |
981 | return r; | |
982 | } | |
983 | ||
984 | int dm_pool_create_snap(struct dm_pool_metadata *pmd, | |
985 | dm_thin_id dev, | |
986 | dm_thin_id origin) | |
987 | { | |
988 | int r; | |
989 | ||
990 | down_write(&pmd->root_lock); | |
991 | r = __create_snap(pmd, dev, origin); | |
992 | up_write(&pmd->root_lock); | |
993 | ||
994 | return r; | |
995 | } | |
996 | ||
997 | static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev) | |
998 | { | |
999 | int r; | |
1000 | uint64_t key = dev; | |
1001 | struct dm_thin_device *td; | |
1002 | ||
1003 | /* TODO: failure should mark the transaction invalid */ | |
1004 | r = __open_device(pmd, dev, 0, &td); | |
1005 | if (r) | |
1006 | return r; | |
1007 | ||
1008 | if (td->open_count > 1) { | |
1009 | __close_device(td); | |
1010 | return -EBUSY; | |
1011 | } | |
1012 | ||
1013 | list_del(&td->list); | |
1014 | kfree(td); | |
1015 | r = dm_btree_remove(&pmd->details_info, pmd->details_root, | |
1016 | &key, &pmd->details_root); | |
1017 | if (r) | |
1018 | return r; | |
1019 | ||
1020 | r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); | |
1021 | if (r) | |
1022 | return r; | |
1023 | ||
1024 | pmd->need_commit = 1; | |
1025 | ||
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, | |
1030 | dm_thin_id dev) | |
1031 | { | |
1032 | int r; | |
1033 | ||
1034 | down_write(&pmd->root_lock); | |
1035 | r = __delete_device(pmd, dev); | |
1036 | up_write(&pmd->root_lock); | |
1037 | ||
1038 | return r; | |
1039 | } | |
1040 | ||
1041 | int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1042 | uint64_t current_id, | |
1043 | uint64_t new_id) | |
1044 | { | |
1045 | down_write(&pmd->root_lock); | |
1046 | if (pmd->trans_id != current_id) { | |
1047 | up_write(&pmd->root_lock); | |
1048 | DMERR("mismatched transaction id"); | |
1049 | return -EINVAL; | |
1050 | } | |
1051 | ||
1052 | pmd->trans_id = new_id; | |
1053 | pmd->need_commit = 1; | |
1054 | up_write(&pmd->root_lock); | |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
1060 | uint64_t *result) | |
1061 | { | |
1062 | down_read(&pmd->root_lock); | |
1063 | *result = pmd->trans_id; | |
1064 | up_read(&pmd->root_lock); | |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | static int __get_held_metadata_root(struct dm_pool_metadata *pmd, | |
1070 | dm_block_t *result) | |
1071 | { | |
1072 | int r; | |
1073 | struct thin_disk_superblock *disk_super; | |
1074 | struct dm_block *sblock; | |
1075 | ||
1076 | r = dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, | |
1077 | &sb_validator, &sblock); | |
1078 | if (r) | |
1079 | return r; | |
1080 | ||
1081 | disk_super = dm_block_data(sblock); | |
1082 | *result = le64_to_cpu(disk_super->held_root); | |
1083 | ||
1084 | return dm_bm_unlock(sblock); | |
1085 | } | |
1086 | ||
1087 | int dm_pool_get_held_metadata_root(struct dm_pool_metadata *pmd, | |
1088 | dm_block_t *result) | |
1089 | { | |
1090 | int r; | |
1091 | ||
1092 | down_read(&pmd->root_lock); | |
1093 | r = __get_held_metadata_root(pmd, result); | |
1094 | up_read(&pmd->root_lock); | |
1095 | ||
1096 | return r; | |
1097 | } | |
1098 | ||
1099 | int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, | |
1100 | struct dm_thin_device **td) | |
1101 | { | |
1102 | int r; | |
1103 | ||
1104 | down_write(&pmd->root_lock); | |
1105 | r = __open_device(pmd, dev, 0, td); | |
1106 | up_write(&pmd->root_lock); | |
1107 | ||
1108 | return r; | |
1109 | } | |
1110 | ||
1111 | int dm_pool_close_thin_device(struct dm_thin_device *td) | |
1112 | { | |
1113 | down_write(&td->pmd->root_lock); | |
1114 | __close_device(td); | |
1115 | up_write(&td->pmd->root_lock); | |
1116 | ||
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | dm_thin_id dm_thin_dev_id(struct dm_thin_device *td) | |
1121 | { | |
1122 | return td->id; | |
1123 | } | |
1124 | ||
1125 | static int __snapshotted_since(struct dm_thin_device *td, uint32_t time) | |
1126 | { | |
1127 | return td->snapshotted_time > time; | |
1128 | } | |
1129 | ||
1130 | int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, | |
1131 | int can_block, struct dm_thin_lookup_result *result) | |
1132 | { | |
1133 | int r; | |
1134 | uint64_t block_time = 0; | |
1135 | __le64 value; | |
1136 | struct dm_pool_metadata *pmd = td->pmd; | |
1137 | dm_block_t keys[2] = { td->id, block }; | |
1138 | ||
1139 | if (can_block) { | |
1140 | down_read(&pmd->root_lock); | |
1141 | r = dm_btree_lookup(&pmd->info, pmd->root, keys, &value); | |
1142 | if (!r) | |
1143 | block_time = le64_to_cpu(value); | |
1144 | up_read(&pmd->root_lock); | |
1145 | ||
1146 | } else if (down_read_trylock(&pmd->root_lock)) { | |
1147 | r = dm_btree_lookup(&pmd->nb_info, pmd->root, keys, &value); | |
1148 | if (!r) | |
1149 | block_time = le64_to_cpu(value); | |
1150 | up_read(&pmd->root_lock); | |
1151 | ||
1152 | } else | |
1153 | return -EWOULDBLOCK; | |
1154 | ||
1155 | if (!r) { | |
1156 | dm_block_t exception_block; | |
1157 | uint32_t exception_time; | |
1158 | unpack_block_time(block_time, &exception_block, | |
1159 | &exception_time); | |
1160 | result->block = exception_block; | |
1161 | result->shared = __snapshotted_since(td, exception_time); | |
1162 | } | |
1163 | ||
1164 | return r; | |
1165 | } | |
1166 | ||
1167 | static int __insert(struct dm_thin_device *td, dm_block_t block, | |
1168 | dm_block_t data_block) | |
1169 | { | |
1170 | int r, inserted; | |
1171 | __le64 value; | |
1172 | struct dm_pool_metadata *pmd = td->pmd; | |
1173 | dm_block_t keys[2] = { td->id, block }; | |
1174 | ||
1175 | pmd->need_commit = 1; | |
1176 | value = cpu_to_le64(pack_block_time(data_block, pmd->time)); | |
1177 | __dm_bless_for_disk(&value); | |
1178 | ||
1179 | r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value, | |
1180 | &pmd->root, &inserted); | |
1181 | if (r) | |
1182 | return r; | |
1183 | ||
1184 | if (inserted) { | |
1185 | td->mapped_blocks++; | |
1186 | td->changed = 1; | |
1187 | } | |
1188 | ||
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, | |
1193 | dm_block_t data_block) | |
1194 | { | |
1195 | int r; | |
1196 | ||
1197 | down_write(&td->pmd->root_lock); | |
1198 | r = __insert(td, block, data_block); | |
1199 | up_write(&td->pmd->root_lock); | |
1200 | ||
1201 | return r; | |
1202 | } | |
1203 | ||
1204 | static int __remove(struct dm_thin_device *td, dm_block_t block) | |
1205 | { | |
1206 | int r; | |
1207 | struct dm_pool_metadata *pmd = td->pmd; | |
1208 | dm_block_t keys[2] = { td->id, block }; | |
1209 | ||
1210 | r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root); | |
1211 | if (r) | |
1212 | return r; | |
1213 | ||
1214 | pmd->need_commit = 1; | |
1215 | ||
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) | |
1220 | { | |
1221 | int r; | |
1222 | ||
1223 | down_write(&td->pmd->root_lock); | |
1224 | r = __remove(td, block); | |
1225 | up_write(&td->pmd->root_lock); | |
1226 | ||
1227 | return r; | |
1228 | } | |
1229 | ||
1230 | int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result) | |
1231 | { | |
1232 | int r; | |
1233 | ||
1234 | down_write(&pmd->root_lock); | |
1235 | ||
1236 | r = dm_sm_new_block(pmd->data_sm, result); | |
1237 | pmd->need_commit = 1; | |
1238 | ||
1239 | up_write(&pmd->root_lock); | |
1240 | ||
1241 | return r; | |
1242 | } | |
1243 | ||
1244 | int dm_pool_commit_metadata(struct dm_pool_metadata *pmd) | |
1245 | { | |
1246 | int r; | |
1247 | ||
1248 | down_write(&pmd->root_lock); | |
1249 | ||
1250 | r = __commit_transaction(pmd); | |
1251 | if (r <= 0) | |
1252 | goto out; | |
1253 | ||
1254 | /* | |
1255 | * Open the next transaction. | |
1256 | */ | |
1257 | r = __begin_transaction(pmd); | |
1258 | out: | |
1259 | up_write(&pmd->root_lock); | |
1260 | return r; | |
1261 | } | |
1262 | ||
1263 | int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result) | |
1264 | { | |
1265 | int r; | |
1266 | ||
1267 | down_read(&pmd->root_lock); | |
1268 | r = dm_sm_get_nr_free(pmd->data_sm, result); | |
1269 | up_read(&pmd->root_lock); | |
1270 | ||
1271 | return r; | |
1272 | } | |
1273 | ||
1274 | int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, | |
1275 | dm_block_t *result) | |
1276 | { | |
1277 | int r; | |
1278 | ||
1279 | down_read(&pmd->root_lock); | |
1280 | r = dm_sm_get_nr_free(pmd->metadata_sm, result); | |
1281 | up_read(&pmd->root_lock); | |
1282 | ||
1283 | return r; | |
1284 | } | |
1285 | ||
1286 | int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, | |
1287 | dm_block_t *result) | |
1288 | { | |
1289 | int r; | |
1290 | ||
1291 | down_read(&pmd->root_lock); | |
1292 | r = dm_sm_get_nr_blocks(pmd->metadata_sm, result); | |
1293 | up_read(&pmd->root_lock); | |
1294 | ||
1295 | return r; | |
1296 | } | |
1297 | ||
1298 | int dm_pool_get_data_block_size(struct dm_pool_metadata *pmd, sector_t *result) | |
1299 | { | |
1300 | down_read(&pmd->root_lock); | |
1301 | *result = pmd->data_block_size; | |
1302 | up_read(&pmd->root_lock); | |
1303 | ||
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result) | |
1308 | { | |
1309 | int r; | |
1310 | ||
1311 | down_read(&pmd->root_lock); | |
1312 | r = dm_sm_get_nr_blocks(pmd->data_sm, result); | |
1313 | up_read(&pmd->root_lock); | |
1314 | ||
1315 | return r; | |
1316 | } | |
1317 | ||
1318 | int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result) | |
1319 | { | |
1320 | struct dm_pool_metadata *pmd = td->pmd; | |
1321 | ||
1322 | down_read(&pmd->root_lock); | |
1323 | *result = td->mapped_blocks; | |
1324 | up_read(&pmd->root_lock); | |
1325 | ||
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | static int __highest_block(struct dm_thin_device *td, dm_block_t *result) | |
1330 | { | |
1331 | int r; | |
1332 | __le64 value_le; | |
1333 | dm_block_t thin_root; | |
1334 | struct dm_pool_metadata *pmd = td->pmd; | |
1335 | ||
1336 | r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le); | |
1337 | if (r) | |
1338 | return r; | |
1339 | ||
1340 | thin_root = le64_to_cpu(value_le); | |
1341 | ||
1342 | return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result); | |
1343 | } | |
1344 | ||
1345 | int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, | |
1346 | dm_block_t *result) | |
1347 | { | |
1348 | int r; | |
1349 | struct dm_pool_metadata *pmd = td->pmd; | |
1350 | ||
1351 | down_read(&pmd->root_lock); | |
1352 | r = __highest_block(td, result); | |
1353 | up_read(&pmd->root_lock); | |
1354 | ||
1355 | return r; | |
1356 | } | |
1357 | ||
1358 | static int __resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) | |
1359 | { | |
1360 | int r; | |
1361 | dm_block_t old_count; | |
1362 | ||
1363 | r = dm_sm_get_nr_blocks(pmd->data_sm, &old_count); | |
1364 | if (r) | |
1365 | return r; | |
1366 | ||
1367 | if (new_count == old_count) | |
1368 | return 0; | |
1369 | ||
1370 | if (new_count < old_count) { | |
1371 | DMERR("cannot reduce size of data device"); | |
1372 | return -EINVAL; | |
1373 | } | |
1374 | ||
1375 | r = dm_sm_extend(pmd->data_sm, new_count - old_count); | |
1376 | if (!r) | |
1377 | pmd->need_commit = 1; | |
1378 | ||
1379 | return r; | |
1380 | } | |
1381 | ||
1382 | int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) | |
1383 | { | |
1384 | int r; | |
1385 | ||
1386 | down_write(&pmd->root_lock); | |
1387 | r = __resize_data_dev(pmd, new_count); | |
1388 | up_write(&pmd->root_lock); | |
1389 | ||
1390 | return r; | |
1391 | } |