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Joe Thornber991d9fa2011-10-31 20:21:18 +00001/*
Joe Thornberda105ed2012-07-27 15:08:15 +01002 * Copyright (C) 2011-2012 Red Hat, Inc.
Joe Thornber991d9fa2011-10-31 20:21:18 +00003 *
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
Jeffle Xu43069042019-12-30 10:54:32 +080031 * field holding the time in the low 24 bits, and block in the top 40
Joe Thornber991d9fa2011-10-31 20:21:18 +000032 * 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
Mike Snitzer07f2b6e02014-02-14 11:58:41 -050079#define THIN_VERSION 2
Joe Thornber991d9fa2011-10-31 20:21:18 +000080#define SECTOR_TO_BLOCK_SHIFT 3
81
Joe Thornber8c971172012-07-27 15:07:58 +010082/*
Dennis Yang490ae012017-12-12 18:21:40 +080083 * For btree insert:
Joe Thornber8c971172012-07-27 15:07:58 +010084 * 3 for btree insert +
85 * 2 for btree lookup used within space map
Dennis Yang490ae012017-12-12 18:21:40 +080086 * For btree remove:
87 * 2 for shadow spine +
88 * 4 for rebalance 3 child node
Joe Thornber8c971172012-07-27 15:07:58 +010089 */
Dennis Yang490ae012017-12-12 18:21:40 +080090#define THIN_MAX_CONCURRENT_LOCKS 6
Joe Thornber8c971172012-07-27 15:07:58 +010091
Joe Thornber991d9fa2011-10-31 20:21:18 +000092/* This should be plenty */
93#define SPACE_MAP_ROOT_SIZE 128
94
95/*
96 * Little endian on-disk superblock and device details.
97 */
98struct thin_disk_superblock {
99 __le32 csum; /* Checksum of superblock except for this field. */
100 __le32 flags;
101 __le64 blocknr; /* This block number, dm_block_t. */
102
103 __u8 uuid[16];
104 __le64 magic;
105 __le32 version;
106 __le32 time;
107
108 __le64 trans_id;
109
110 /*
111 * Root held by userspace transactions.
112 */
113 __le64 held_root;
114
115 __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE];
116 __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
117
118 /*
119 * 2-level btree mapping (dev_id, (dev block, time)) -> data block
120 */
121 __le64 data_mapping_root;
122
123 /*
124 * Device detail root mapping dev_id -> device_details
125 */
126 __le64 device_details_root;
127
128 __le32 data_block_size; /* In 512-byte sectors. */
129
130 __le32 metadata_block_size; /* In 512-byte sectors. */
131 __le64 metadata_nr_blocks;
132
133 __le32 compat_flags;
134 __le32 compat_ro_flags;
135 __le32 incompat_flags;
136} __packed;
137
138struct disk_device_details {
139 __le64 mapped_blocks;
140 __le64 transaction_id; /* When created. */
141 __le32 creation_time;
142 __le32 snapshotted_time;
143} __packed;
144
145struct dm_pool_metadata {
146 struct hlist_node hash;
147
148 struct block_device *bdev;
149 struct dm_block_manager *bm;
150 struct dm_space_map *metadata_sm;
151 struct dm_space_map *data_sm;
152 struct dm_transaction_manager *tm;
153 struct dm_transaction_manager *nb_tm;
154
155 /*
156 * Two-level btree.
157 * First level holds thin_dev_t.
158 * Second level holds mappings.
159 */
160 struct dm_btree_info info;
161
162 /*
163 * Non-blocking version of the above.
164 */
165 struct dm_btree_info nb_info;
166
167 /*
168 * Just the top level for deleting whole devices.
169 */
170 struct dm_btree_info tl_info;
171
172 /*
173 * Just the bottom level for creating new devices.
174 */
175 struct dm_btree_info bl_info;
176
177 /*
178 * Describes the device details btree.
179 */
180 struct dm_btree_info details_info;
181
182 struct rw_semaphore root_lock;
183 uint32_t time;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000184 dm_block_t root;
185 dm_block_t details_root;
186 struct list_head thin_devices;
187 uint64_t trans_id;
188 unsigned long flags;
189 sector_t data_block_size;
Joe Thornberda105ed2012-07-27 15:08:15 +0100190
191 /*
Nikos Tsironisecda7c02019-12-04 16:07:41 +0200192 * Pre-commit callback.
193 *
194 * This allows the thin provisioning target to run a callback before
195 * the metadata are committed.
196 */
197 dm_pool_pre_commit_fn pre_commit_fn;
198 void *pre_commit_context;
199
200 /*
Joe Thornber3ab91822018-09-10 16:50:09 +0100201 * We reserve a section of the metadata for commit overhead.
202 * All reported space does *not* include this.
203 */
204 dm_block_t metadata_reserve;
205
206 /*
Joe Thornberda105ed2012-07-27 15:08:15 +0100207 * Set if a transaction has to be aborted but the attempt to roll back
208 * to the previous (good) transaction failed. The only pool metadata
209 * operation possible in this state is the closing of the device.
210 */
211 bool fail_io:1;
Joe Thornber5a320832014-03-27 14:13:23 +0000212
213 /*
Mike Snitzer873f2582019-04-18 10:29:48 -0400214 * Set once a thin-pool has been accessed through one of the interfaces
215 * that imply the pool is in-service (e.g. thin devices created/deleted,
216 * thin-pool message, metadata snapshots, etc).
217 */
218 bool in_service:1;
219
220 /*
Joe Thornber5a320832014-03-27 14:13:23 +0000221 * Reading the space map roots can fail, so we read it into these
222 * buffers before the superblock is locked and updated.
223 */
224 __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE];
225 __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
Joe Thornber991d9fa2011-10-31 20:21:18 +0000226};
227
228struct dm_thin_device {
229 struct list_head list;
230 struct dm_pool_metadata *pmd;
231 dm_thin_id id;
232
233 int open_count;
Joe Thornberda105ed2012-07-27 15:08:15 +0100234 bool changed:1;
235 bool aborted_with_changes:1;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000236 uint64_t mapped_blocks;
237 uint64_t transaction_id;
238 uint32_t creation_time;
239 uint32_t snapshotted_time;
240};
241
242/*----------------------------------------------------------------
243 * superblock validator
244 *--------------------------------------------------------------*/
245
246#define SUPERBLOCK_CSUM_XOR 160774
247
248static void sb_prepare_for_write(struct dm_block_validator *v,
249 struct dm_block *b,
250 size_t block_size)
251{
252 struct thin_disk_superblock *disk_super = dm_block_data(b);
253
254 disk_super->blocknr = cpu_to_le64(dm_block_location(b));
255 disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags,
256 block_size - sizeof(__le32),
257 SUPERBLOCK_CSUM_XOR));
258}
259
260static int sb_check(struct dm_block_validator *v,
261 struct dm_block *b,
262 size_t block_size)
263{
264 struct thin_disk_superblock *disk_super = dm_block_data(b);
265 __le32 csum_le;
266
267 if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) {
268 DMERR("sb_check failed: blocknr %llu: "
269 "wanted %llu", le64_to_cpu(disk_super->blocknr),
270 (unsigned long long)dm_block_location(b));
271 return -ENOTBLK;
272 }
273
274 if (le64_to_cpu(disk_super->magic) != THIN_SUPERBLOCK_MAGIC) {
275 DMERR("sb_check failed: magic %llu: "
276 "wanted %llu", le64_to_cpu(disk_super->magic),
277 (unsigned long long)THIN_SUPERBLOCK_MAGIC);
278 return -EILSEQ;
279 }
280
281 csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags,
282 block_size - sizeof(__le32),
283 SUPERBLOCK_CSUM_XOR));
284 if (csum_le != disk_super->csum) {
285 DMERR("sb_check failed: csum %u: wanted %u",
286 le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum));
287 return -EILSEQ;
288 }
289
290 return 0;
291}
292
293static struct dm_block_validator sb_validator = {
294 .name = "superblock",
295 .prepare_for_write = sb_prepare_for_write,
296 .check = sb_check
297};
298
299/*----------------------------------------------------------------
300 * Methods for the btree value types
301 *--------------------------------------------------------------*/
302
303static uint64_t pack_block_time(dm_block_t b, uint32_t t)
304{
305 return (b << 24) | t;
306}
307
308static void unpack_block_time(uint64_t v, dm_block_t *b, uint32_t *t)
309{
310 *b = v >> 24;
311 *t = v & ((1 << 24) - 1);
312}
313
Mike Snitzer018cede2013-03-01 22:45:47 +0000314static void data_block_inc(void *context, const void *value_le)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000315{
316 struct dm_space_map *sm = context;
317 __le64 v_le;
318 uint64_t b;
319 uint32_t t;
320
321 memcpy(&v_le, value_le, sizeof(v_le));
322 unpack_block_time(le64_to_cpu(v_le), &b, &t);
323 dm_sm_inc_block(sm, b);
324}
325
Mike Snitzer018cede2013-03-01 22:45:47 +0000326static void data_block_dec(void *context, const void *value_le)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000327{
328 struct dm_space_map *sm = context;
329 __le64 v_le;
330 uint64_t b;
331 uint32_t t;
332
333 memcpy(&v_le, value_le, sizeof(v_le));
334 unpack_block_time(le64_to_cpu(v_le), &b, &t);
335 dm_sm_dec_block(sm, b);
336}
337
Mike Snitzer018cede2013-03-01 22:45:47 +0000338static int data_block_equal(void *context, const void *value1_le, const void *value2_le)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000339{
340 __le64 v1_le, v2_le;
341 uint64_t b1, b2;
342 uint32_t t;
343
344 memcpy(&v1_le, value1_le, sizeof(v1_le));
345 memcpy(&v2_le, value2_le, sizeof(v2_le));
346 unpack_block_time(le64_to_cpu(v1_le), &b1, &t);
347 unpack_block_time(le64_to_cpu(v2_le), &b2, &t);
348
349 return b1 == b2;
350}
351
Mike Snitzer018cede2013-03-01 22:45:47 +0000352static void subtree_inc(void *context, const void *value)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000353{
354 struct dm_btree_info *info = context;
355 __le64 root_le;
356 uint64_t root;
357
358 memcpy(&root_le, value, sizeof(root_le));
359 root = le64_to_cpu(root_le);
360 dm_tm_inc(info->tm, root);
361}
362
Mike Snitzer018cede2013-03-01 22:45:47 +0000363static void subtree_dec(void *context, const void *value)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000364{
365 struct dm_btree_info *info = context;
366 __le64 root_le;
367 uint64_t root;
368
369 memcpy(&root_le, value, sizeof(root_le));
370 root = le64_to_cpu(root_le);
371 if (dm_btree_del(info, root))
Mike Snitzer29f929b2016-01-21 14:04:04 -0500372 DMERR("btree delete failed");
Joe Thornber991d9fa2011-10-31 20:21:18 +0000373}
374
Mike Snitzer018cede2013-03-01 22:45:47 +0000375static int subtree_equal(void *context, const void *value1_le, const void *value2_le)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000376{
377 __le64 v1_le, v2_le;
378 memcpy(&v1_le, value1_le, sizeof(v1_le));
379 memcpy(&v2_le, value2_le, sizeof(v2_le));
380
381 return v1_le == v2_le;
382}
383
384/*----------------------------------------------------------------*/
385
Mike Snitzer873f2582019-04-18 10:29:48 -0400386/*
387 * Variant that is used for in-core only changes or code that
388 * shouldn't put the pool in service on its own (e.g. commit).
389 */
Mike Snitzer44d8ebf2020-01-13 11:18:51 -0500390static inline void pmd_write_lock_in_core(struct dm_pool_metadata *pmd)
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -0400391 __acquires(pmd->root_lock)
392{
393 down_write(&pmd->root_lock);
394}
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -0400395
396static inline void pmd_write_lock(struct dm_pool_metadata *pmd)
397{
Mike Snitzer44d8ebf2020-01-13 11:18:51 -0500398 pmd_write_lock_in_core(pmd);
Mike Snitzer873f2582019-04-18 10:29:48 -0400399 if (unlikely(!pmd->in_service))
400 pmd->in_service = true;
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -0400401}
402
403static inline void pmd_write_unlock(struct dm_pool_metadata *pmd)
404 __releases(pmd->root_lock)
405{
406 up_write(&pmd->root_lock);
407}
408
409/*----------------------------------------------------------------*/
410
Joe Thornber25971192012-07-27 15:08:09 +0100411static int superblock_lock_zero(struct dm_pool_metadata *pmd,
412 struct dm_block **sblock)
413{
414 return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION,
415 &sb_validator, sblock);
416}
417
418static int superblock_lock(struct dm_pool_metadata *pmd,
419 struct dm_block **sblock)
420{
421 return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
422 &sb_validator, sblock);
423}
424
Joe Thornber332627d2012-07-27 15:08:10 +0100425static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000426{
427 int r;
428 unsigned i;
429 struct dm_block *b;
430 __le64 *data_le, zero = cpu_to_le64(0);
431 unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64);
432
433 /*
434 * We can't use a validator here - it may be all zeroes.
435 */
436 r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b);
437 if (r)
438 return r;
439
440 data_le = dm_block_data(b);
441 *result = 1;
442 for (i = 0; i < block_size; i++) {
443 if (data_le[i] != zero) {
444 *result = 0;
445 break;
446 }
447 }
448
Mikulas Patocka4c7da062015-10-22 16:46:59 -0400449 dm_bm_unlock(b);
450
451 return 0;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000452}
453
Joe Thornber41675ae2012-07-27 15:08:08 +0100454static void __setup_btree_details(struct dm_pool_metadata *pmd)
455{
456 pmd->info.tm = pmd->tm;
457 pmd->info.levels = 2;
458 pmd->info.value_type.context = pmd->data_sm;
459 pmd->info.value_type.size = sizeof(__le64);
460 pmd->info.value_type.inc = data_block_inc;
461 pmd->info.value_type.dec = data_block_dec;
462 pmd->info.value_type.equal = data_block_equal;
463
464 memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info));
465 pmd->nb_info.tm = pmd->nb_tm;
466
467 pmd->tl_info.tm = pmd->tm;
468 pmd->tl_info.levels = 1;
Joe Thornbere3cbf942012-12-21 20:23:32 +0000469 pmd->tl_info.value_type.context = &pmd->bl_info;
Joe Thornber41675ae2012-07-27 15:08:08 +0100470 pmd->tl_info.value_type.size = sizeof(__le64);
471 pmd->tl_info.value_type.inc = subtree_inc;
472 pmd->tl_info.value_type.dec = subtree_dec;
473 pmd->tl_info.value_type.equal = subtree_equal;
474
475 pmd->bl_info.tm = pmd->tm;
476 pmd->bl_info.levels = 1;
477 pmd->bl_info.value_type.context = pmd->data_sm;
478 pmd->bl_info.value_type.size = sizeof(__le64);
479 pmd->bl_info.value_type.inc = data_block_inc;
480 pmd->bl_info.value_type.dec = data_block_dec;
481 pmd->bl_info.value_type.equal = data_block_equal;
482
483 pmd->details_info.tm = pmd->tm;
484 pmd->details_info.levels = 1;
485 pmd->details_info.value_type.context = NULL;
486 pmd->details_info.value_type.size = sizeof(struct disk_device_details);
487 pmd->details_info.value_type.inc = NULL;
488 pmd->details_info.value_type.dec = NULL;
489 pmd->details_info.value_type.equal = NULL;
490}
491
Joe Thornber5a320832014-03-27 14:13:23 +0000492static int save_sm_roots(struct dm_pool_metadata *pmd)
493{
494 int r;
495 size_t len;
496
497 r = dm_sm_root_size(pmd->metadata_sm, &len);
498 if (r < 0)
499 return r;
500
501 r = dm_sm_copy_root(pmd->metadata_sm, &pmd->metadata_space_map_root, len);
502 if (r < 0)
503 return r;
504
505 r = dm_sm_root_size(pmd->data_sm, &len);
506 if (r < 0)
507 return r;
508
509 return dm_sm_copy_root(pmd->data_sm, &pmd->data_space_map_root, len);
510}
511
512static void copy_sm_roots(struct dm_pool_metadata *pmd,
513 struct thin_disk_superblock *disk)
514{
515 memcpy(&disk->metadata_space_map_root,
516 &pmd->metadata_space_map_root,
517 sizeof(pmd->metadata_space_map_root));
518
519 memcpy(&disk->data_space_map_root,
520 &pmd->data_space_map_root,
521 sizeof(pmd->data_space_map_root));
522}
523
Joe Thornber9cb66532012-07-27 15:08:10 +0100524static int __write_initial_superblock(struct dm_pool_metadata *pmd)
525{
526 int r;
527 struct dm_block *sblock;
528 struct thin_disk_superblock *disk_super;
529 sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT;
530
531 if (bdev_size > THIN_METADATA_MAX_SECTORS)
532 bdev_size = THIN_METADATA_MAX_SECTORS;
533
Joe Thornber10d2a9f2012-07-27 15:08:11 +0100534 r = dm_sm_commit(pmd->data_sm);
535 if (r < 0)
536 return r;
537
Joe Thornber91bcdb92017-05-15 09:43:05 -0400538 r = dm_tm_pre_commit(pmd->tm);
Joe Thornber5a320832014-03-27 14:13:23 +0000539 if (r < 0)
540 return r;
541
Joe Thornber91bcdb92017-05-15 09:43:05 -0400542 r = save_sm_roots(pmd);
Joe Thornber10d2a9f2012-07-27 15:08:11 +0100543 if (r < 0)
544 return r;
545
Joe Thornber9cb66532012-07-27 15:08:10 +0100546 r = superblock_lock_zero(pmd, &sblock);
547 if (r)
548 return r;
549
550 disk_super = dm_block_data(sblock);
Joe Thornber10d2a9f2012-07-27 15:08:11 +0100551 disk_super->flags = 0;
Joe Thornber583ceee2012-07-27 15:08:11 +0100552 memset(disk_super->uuid, 0, sizeof(disk_super->uuid));
Joe Thornber9cb66532012-07-27 15:08:10 +0100553 disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC);
554 disk_super->version = cpu_to_le32(THIN_VERSION);
555 disk_super->time = 0;
Joe Thornber10d2a9f2012-07-27 15:08:11 +0100556 disk_super->trans_id = 0;
557 disk_super->held_root = 0;
558
Joe Thornber5a320832014-03-27 14:13:23 +0000559 copy_sm_roots(pmd, disk_super);
Joe Thornber10d2a9f2012-07-27 15:08:11 +0100560
561 disk_super->data_mapping_root = cpu_to_le64(pmd->root);
562 disk_super->device_details_root = cpu_to_le64(pmd->details_root);
Mike Snitzer7d489352014-02-12 23:58:15 -0500563 disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE);
Joe Thornber9cb66532012-07-27 15:08:10 +0100564 disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT);
565 disk_super->data_block_size = cpu_to_le32(pmd->data_block_size);
566
Joe Thornber270938b2012-07-27 15:08:11 +0100567 return dm_tm_commit(pmd->tm, sblock);
Joe Thornber9cb66532012-07-27 15:08:10 +0100568}
569
Joe Thornbera97e5e62012-07-27 15:08:12 +0100570static int __format_metadata(struct dm_pool_metadata *pmd)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000571{
572 int r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000573
Joe Thornbere4d22052012-07-27 15:08:12 +0100574 r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION,
575 &pmd->tm, &pmd->metadata_sm);
576 if (r < 0) {
577 DMERR("tm_create_with_sm failed");
578 return r;
579 }
Joe Thornber991d9fa2011-10-31 20:21:18 +0000580
Joe Thornbera97e5e62012-07-27 15:08:12 +0100581 pmd->data_sm = dm_sm_disk_create(pmd->tm, 0);
Joe Thornbere4d22052012-07-27 15:08:12 +0100582 if (IS_ERR(pmd->data_sm)) {
583 DMERR("sm_disk_create failed");
584 r = PTR_ERR(pmd->data_sm);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100585 goto bad_cleanup_tm;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000586 }
587
Joe Thornberd6332812012-07-27 15:08:12 +0100588 pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000589 if (!pmd->nb_tm) {
Joe Thornber0fa5b172012-07-27 15:08:14 +0100590 DMERR("could not create non-blocking clone tm");
Joe Thornber991d9fa2011-10-31 20:21:18 +0000591 r = -ENOMEM;
Joe Thornber0fa5b172012-07-27 15:08:14 +0100592 goto bad_cleanup_data_sm;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000593 }
594
Joe Thornber41675ae2012-07-27 15:08:08 +0100595 __setup_btree_details(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000596
Joe Thornber9cb66532012-07-27 15:08:10 +0100597 r = dm_btree_empty(&pmd->info, &pmd->root);
598 if (r < 0)
Joe Thornber0fa5b172012-07-27 15:08:14 +0100599 goto bad_cleanup_nb_tm;
Joe Thornber9cb66532012-07-27 15:08:10 +0100600
601 r = dm_btree_empty(&pmd->details_info, &pmd->details_root);
602 if (r < 0) {
603 DMERR("couldn't create devices root");
Joe Thornber0fa5b172012-07-27 15:08:14 +0100604 goto bad_cleanup_nb_tm;
Joe Thornber9cb66532012-07-27 15:08:10 +0100605 }
606
607 r = __write_initial_superblock(pmd);
608 if (r)
Joe Thornber0fa5b172012-07-27 15:08:14 +0100609 goto bad_cleanup_nb_tm;
Joe Thornber9cb66532012-07-27 15:08:10 +0100610
Joe Thornber991d9fa2011-10-31 20:21:18 +0000611 return 0;
612
Joe Thornber0fa5b172012-07-27 15:08:14 +0100613bad_cleanup_nb_tm:
614 dm_tm_destroy(pmd->nb_tm);
615bad_cleanup_data_sm:
Joe Thornberd6332812012-07-27 15:08:12 +0100616 dm_sm_destroy(pmd->data_sm);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100617bad_cleanup_tm:
Joe Thornberd6332812012-07-27 15:08:12 +0100618 dm_tm_destroy(pmd->tm);
619 dm_sm_destroy(pmd->metadata_sm);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000620
621 return r;
622}
623
Mike Snitzerd73ec522012-07-27 15:08:13 +0100624static int __check_incompat_features(struct thin_disk_superblock *disk_super,
625 struct dm_pool_metadata *pmd)
626{
627 uint32_t features;
628
629 features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP;
630 if (features) {
631 DMERR("could not access metadata due to unsupported optional features (%lx).",
632 (unsigned long)features);
633 return -EINVAL;
634 }
635
636 /*
637 * Check for read-only metadata to skip the following RDWR checks.
638 */
639 if (get_disk_ro(pmd->bdev->bd_disk))
640 return 0;
641
642 features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP;
643 if (features) {
644 DMERR("could not access metadata RDWR due to unsupported optional features (%lx).",
645 (unsigned long)features);
646 return -EINVAL;
647 }
648
649 return 0;
650}
651
Joe Thornbere4d22052012-07-27 15:08:12 +0100652static int __open_metadata(struct dm_pool_metadata *pmd)
653{
654 int r;
655 struct dm_block *sblock;
656 struct thin_disk_superblock *disk_super;
657
658 r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
659 &sb_validator, &sblock);
660 if (r < 0) {
661 DMERR("couldn't read superblock");
662 return r;
663 }
664
665 disk_super = dm_block_data(sblock);
Mike Snitzerd73ec522012-07-27 15:08:13 +0100666
Mike Snitzer9aec8622014-07-14 16:35:54 -0400667 /* Verify the data block size hasn't changed */
668 if (le32_to_cpu(disk_super->data_block_size) != pmd->data_block_size) {
669 DMERR("changing the data block size (from %u to %llu) is not supported",
670 le32_to_cpu(disk_super->data_block_size),
671 (unsigned long long)pmd->data_block_size);
672 r = -EINVAL;
673 goto bad_unlock_sblock;
674 }
675
Mike Snitzerd73ec522012-07-27 15:08:13 +0100676 r = __check_incompat_features(disk_super, pmd);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100677 if (r < 0)
678 goto bad_unlock_sblock;
Mike Snitzerd73ec522012-07-27 15:08:13 +0100679
Joe Thornbere4d22052012-07-27 15:08:12 +0100680 r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION,
681 disk_super->metadata_space_map_root,
682 sizeof(disk_super->metadata_space_map_root),
683 &pmd->tm, &pmd->metadata_sm);
684 if (r < 0) {
685 DMERR("tm_open_with_sm failed");
Joe Thornber0fa5b172012-07-27 15:08:14 +0100686 goto bad_unlock_sblock;
Joe Thornbere4d22052012-07-27 15:08:12 +0100687 }
688
689 pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root,
690 sizeof(disk_super->data_space_map_root));
691 if (IS_ERR(pmd->data_sm)) {
692 DMERR("sm_disk_open failed");
Joe Thornbere4d22052012-07-27 15:08:12 +0100693 r = PTR_ERR(pmd->data_sm);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100694 goto bad_cleanup_tm;
Joe Thornbere4d22052012-07-27 15:08:12 +0100695 }
696
Joe Thornbere4d22052012-07-27 15:08:12 +0100697 pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm);
698 if (!pmd->nb_tm) {
Joe Thornber0fa5b172012-07-27 15:08:14 +0100699 DMERR("could not create non-blocking clone tm");
Joe Thornbere4d22052012-07-27 15:08:12 +0100700 r = -ENOMEM;
Joe Thornber0fa5b172012-07-27 15:08:14 +0100701 goto bad_cleanup_data_sm;
Joe Thornbere4d22052012-07-27 15:08:12 +0100702 }
703
704 __setup_btree_details(pmd);
Mikulas Patocka4c7da062015-10-22 16:46:59 -0400705 dm_bm_unlock(sblock);
706
707 return 0;
Joe Thornbere4d22052012-07-27 15:08:12 +0100708
Joe Thornber0fa5b172012-07-27 15:08:14 +0100709bad_cleanup_data_sm:
Joe Thornbere4d22052012-07-27 15:08:12 +0100710 dm_sm_destroy(pmd->data_sm);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100711bad_cleanup_tm:
Joe Thornbere4d22052012-07-27 15:08:12 +0100712 dm_tm_destroy(pmd->tm);
713 dm_sm_destroy(pmd->metadata_sm);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100714bad_unlock_sblock:
715 dm_bm_unlock(sblock);
Joe Thornbere4d22052012-07-27 15:08:12 +0100716
717 return r;
718}
719
Joe Thornber66b1edc2012-07-27 15:08:14 +0100720static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device)
Joe Thornbere4d22052012-07-27 15:08:12 +0100721{
Joe Thornber8801e062012-07-27 15:08:13 +0100722 int r, unformatted;
Joe Thornber237074c2012-07-27 15:08:13 +0100723
Joe Thornber8801e062012-07-27 15:08:13 +0100724 r = __superblock_all_zeroes(pmd->bm, &unformatted);
Joe Thornber237074c2012-07-27 15:08:13 +0100725 if (r)
726 return r;
727
Joe Thornber8801e062012-07-27 15:08:13 +0100728 if (unformatted)
Joe Thornber66b1edc2012-07-27 15:08:14 +0100729 return format_device ? __format_metadata(pmd) : -EPERM;
730
731 return __open_metadata(pmd);
Joe Thornbere4d22052012-07-27 15:08:12 +0100732}
733
Joe Thornber66b1edc2012-07-27 15:08:14 +0100734static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device)
Joe Thornber332627d2012-07-27 15:08:10 +0100735{
736 int r;
737
Mike Snitzer7d489352014-02-12 23:58:15 -0500738 pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT,
Joe Thornber332627d2012-07-27 15:08:10 +0100739 THIN_MAX_CONCURRENT_LOCKS);
740 if (IS_ERR(pmd->bm)) {
741 DMERR("could not create block manager");
Ye Bin219403d2020-09-01 14:25:43 +0800742 r = PTR_ERR(pmd->bm);
743 pmd->bm = NULL;
744 return r;
Joe Thornber332627d2012-07-27 15:08:10 +0100745 }
746
Joe Thornber66b1edc2012-07-27 15:08:14 +0100747 r = __open_or_format_metadata(pmd, format_device);
Ye Bin219403d2020-09-01 14:25:43 +0800748 if (r) {
Joe Thornber332627d2012-07-27 15:08:10 +0100749 dm_block_manager_destroy(pmd->bm);
Ye Bin219403d2020-09-01 14:25:43 +0800750 pmd->bm = NULL;
751 }
Joe Thornber332627d2012-07-27 15:08:10 +0100752
753 return r;
754}
755
Joe Thornberf9dd9352012-07-27 15:08:10 +0100756static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd)
757{
758 dm_sm_destroy(pmd->data_sm);
759 dm_sm_destroy(pmd->metadata_sm);
760 dm_tm_destroy(pmd->nb_tm);
761 dm_tm_destroy(pmd->tm);
762 dm_block_manager_destroy(pmd->bm);
763}
764
Joe Thornber991d9fa2011-10-31 20:21:18 +0000765static int __begin_transaction(struct dm_pool_metadata *pmd)
766{
767 int r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000768 struct thin_disk_superblock *disk_super;
769 struct dm_block *sblock;
770
771 /*
Joe Thornber991d9fa2011-10-31 20:21:18 +0000772 * We re-read the superblock every time. Shouldn't need to do this
773 * really.
774 */
775 r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
776 &sb_validator, &sblock);
777 if (r)
778 return r;
779
780 disk_super = dm_block_data(sblock);
781 pmd->time = le32_to_cpu(disk_super->time);
782 pmd->root = le64_to_cpu(disk_super->data_mapping_root);
783 pmd->details_root = le64_to_cpu(disk_super->device_details_root);
784 pmd->trans_id = le64_to_cpu(disk_super->trans_id);
785 pmd->flags = le32_to_cpu(disk_super->flags);
786 pmd->data_block_size = le32_to_cpu(disk_super->data_block_size);
787
Joe Thornber991d9fa2011-10-31 20:21:18 +0000788 dm_bm_unlock(sblock);
Mike Snitzerd73ec522012-07-27 15:08:13 +0100789 return 0;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000790}
791
792static int __write_changed_details(struct dm_pool_metadata *pmd)
793{
794 int r;
795 struct dm_thin_device *td, *tmp;
796 struct disk_device_details details;
797 uint64_t key;
798
799 list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) {
800 if (!td->changed)
801 continue;
802
803 key = td->id;
804
805 details.mapped_blocks = cpu_to_le64(td->mapped_blocks);
806 details.transaction_id = cpu_to_le64(td->transaction_id);
807 details.creation_time = cpu_to_le32(td->creation_time);
808 details.snapshotted_time = cpu_to_le32(td->snapshotted_time);
809 __dm_bless_for_disk(&details);
810
811 r = dm_btree_insert(&pmd->details_info, pmd->details_root,
812 &key, &details, &pmd->details_root);
813 if (r)
814 return r;
815
816 if (td->open_count)
zhengbin63ee92d2019-12-24 14:38:03 +0800817 td->changed = false;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000818 else {
819 list_del(&td->list);
820 kfree(td);
821 }
Joe Thornber991d9fa2011-10-31 20:21:18 +0000822 }
823
824 return 0;
825}
826
827static int __commit_transaction(struct dm_pool_metadata *pmd)
828{
Joe Thornber991d9fa2011-10-31 20:21:18 +0000829 int r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000830 struct thin_disk_superblock *disk_super;
831 struct dm_block *sblock;
832
833 /*
834 * We need to know if the thin_disk_superblock exceeds a 512-byte sector.
835 */
836 BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512);
Mike Snitzer44d8ebf2020-01-13 11:18:51 -0500837 BUG_ON(!rwsem_is_locked(&pmd->root_lock));
Joe Thornber991d9fa2011-10-31 20:21:18 +0000838
Mike Snitzer873f2582019-04-18 10:29:48 -0400839 if (unlikely(!pmd->in_service))
840 return 0;
841
Nikos Tsironisecda7c02019-12-04 16:07:41 +0200842 if (pmd->pre_commit_fn) {
843 r = pmd->pre_commit_fn(pmd->pre_commit_context);
844 if (r < 0) {
845 DMERR("pre-commit callback failed");
846 return r;
847 }
848 }
849
Joe Thornber991d9fa2011-10-31 20:21:18 +0000850 r = __write_changed_details(pmd);
851 if (r < 0)
Joe Thornberd973ac12012-07-27 15:07:58 +0100852 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000853
Joe Thornber991d9fa2011-10-31 20:21:18 +0000854 r = dm_sm_commit(pmd->data_sm);
855 if (r < 0)
Joe Thornberd973ac12012-07-27 15:07:58 +0100856 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000857
858 r = dm_tm_pre_commit(pmd->tm);
859 if (r < 0)
Joe Thornberd973ac12012-07-27 15:07:58 +0100860 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000861
Joe Thornber5a320832014-03-27 14:13:23 +0000862 r = save_sm_roots(pmd);
863 if (r < 0)
864 return r;
865
Joe Thornber25971192012-07-27 15:08:09 +0100866 r = superblock_lock(pmd, &sblock);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000867 if (r)
Joe Thornberd973ac12012-07-27 15:07:58 +0100868 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000869
870 disk_super = dm_block_data(sblock);
871 disk_super->time = cpu_to_le32(pmd->time);
872 disk_super->data_mapping_root = cpu_to_le64(pmd->root);
873 disk_super->device_details_root = cpu_to_le64(pmd->details_root);
874 disk_super->trans_id = cpu_to_le64(pmd->trans_id);
875 disk_super->flags = cpu_to_le32(pmd->flags);
876
Joe Thornber5a320832014-03-27 14:13:23 +0000877 copy_sm_roots(pmd, disk_super);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000878
Joe Thornbereb04cf62012-07-27 15:08:08 +0100879 return dm_tm_commit(pmd->tm, sblock);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000880}
881
Joe Thornber3ab91822018-09-10 16:50:09 +0100882static void __set_metadata_reserve(struct dm_pool_metadata *pmd)
883{
884 int r;
885 dm_block_t total;
886 dm_block_t max_blocks = 4096; /* 16M */
887
888 r = dm_sm_get_nr_blocks(pmd->metadata_sm, &total);
889 if (r) {
890 DMERR("could not get size of metadata device");
891 pmd->metadata_reserve = max_blocks;
Mike Snitzer013ad042018-09-13 21:16:20 -0400892 } else
893 pmd->metadata_reserve = min(max_blocks, div_u64(total, 10));
Joe Thornber3ab91822018-09-10 16:50:09 +0100894}
895
Joe Thornber991d9fa2011-10-31 20:21:18 +0000896struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
Joe Thornber66b1edc2012-07-27 15:08:14 +0100897 sector_t data_block_size,
898 bool format_device)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000899{
900 int r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000901 struct dm_pool_metadata *pmd;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000902
903 pmd = kmalloc(sizeof(*pmd), GFP_KERNEL);
904 if (!pmd) {
905 DMERR("could not allocate metadata struct");
906 return ERR_PTR(-ENOMEM);
907 }
908
Joe Thornber6a0ebd32012-07-27 15:08:10 +0100909 init_rwsem(&pmd->root_lock);
910 pmd->time = 0;
911 INIT_LIST_HEAD(&pmd->thin_devices);
Joe Thornberda105ed2012-07-27 15:08:15 +0100912 pmd->fail_io = false;
Mike Snitzer873f2582019-04-18 10:29:48 -0400913 pmd->in_service = false;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000914 pmd->bdev = bdev;
Joe Thornber9cb66532012-07-27 15:08:10 +0100915 pmd->data_block_size = data_block_size;
Nikos Tsironisecda7c02019-12-04 16:07:41 +0200916 pmd->pre_commit_fn = NULL;
917 pmd->pre_commit_context = NULL;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000918
Joe Thornber66b1edc2012-07-27 15:08:14 +0100919 r = __create_persistent_data_objects(pmd, format_device);
Joe Thornber332627d2012-07-27 15:08:10 +0100920 if (r) {
921 kfree(pmd);
922 return ERR_PTR(r);
923 }
924
Joe Thornber270938b2012-07-27 15:08:11 +0100925 r = __begin_transaction(pmd);
926 if (r < 0) {
927 if (dm_pool_metadata_close(pmd) < 0)
928 DMWARN("%s: dm_pool_metadata_close() failed.", __func__);
929 return ERR_PTR(r);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000930 }
931
Joe Thornber3ab91822018-09-10 16:50:09 +0100932 __set_metadata_reserve(pmd);
933
Joe Thornber991d9fa2011-10-31 20:21:18 +0000934 return pmd;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000935}
936
937int dm_pool_metadata_close(struct dm_pool_metadata *pmd)
938{
939 int r;
940 unsigned open_devices = 0;
941 struct dm_thin_device *td, *tmp;
942
943 down_read(&pmd->root_lock);
944 list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) {
945 if (td->open_count)
946 open_devices++;
947 else {
948 list_del(&td->list);
949 kfree(td);
950 }
951 }
952 up_read(&pmd->root_lock);
953
954 if (open_devices) {
955 DMERR("attempt to close pmd when %u device(s) are still open",
956 open_devices);
957 return -EBUSY;
958 }
959
Mike Snitzer44d8ebf2020-01-13 11:18:51 -0500960 pmd_write_lock_in_core(pmd);
Ye Bin3a653b22020-09-01 14:25:44 +0800961 if (!pmd->fail_io && !dm_bm_is_read_only(pmd->bm)) {
Joe Thornber12ba58a2012-07-27 15:08:15 +0100962 r = __commit_transaction(pmd);
963 if (r < 0)
964 DMWARN("%s: __commit_transaction() failed, error = %d",
965 __func__, r);
966 }
Theodore Ts'o3918e062020-02-23 14:54:58 -0500967 pmd_write_unlock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +0100968 if (!pmd->fail_io)
969 __destroy_persistent_data_objects(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000970
Joe Thornberda105ed2012-07-27 15:08:15 +0100971 kfree(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000972 return 0;
973}
974
Mike Snitzer1f3db252012-03-07 19:09:41 +0000975/*
976 * __open_device: Returns @td corresponding to device with id @dev,
977 * creating it if @create is set and incrementing @td->open_count.
978 * On failure, @td is undefined.
979 */
Joe Thornber991d9fa2011-10-31 20:21:18 +0000980static int __open_device(struct dm_pool_metadata *pmd,
981 dm_thin_id dev, int create,
982 struct dm_thin_device **td)
983{
984 int r, changed = 0;
985 struct dm_thin_device *td2;
986 uint64_t key = dev;
987 struct disk_device_details details_le;
988
989 /*
Mike Snitzer1f3db252012-03-07 19:09:41 +0000990 * If the device is already open, return it.
Joe Thornber991d9fa2011-10-31 20:21:18 +0000991 */
992 list_for_each_entry(td2, &pmd->thin_devices, list)
993 if (td2->id == dev) {
Mike Snitzer1f3db252012-03-07 19:09:41 +0000994 /*
995 * May not create an already-open device.
996 */
997 if (create)
998 return -EEXIST;
999
Joe Thornber991d9fa2011-10-31 20:21:18 +00001000 td2->open_count++;
1001 *td = td2;
1002 return 0;
1003 }
1004
1005 /*
1006 * Check the device exists.
1007 */
1008 r = dm_btree_lookup(&pmd->details_info, pmd->details_root,
1009 &key, &details_le);
1010 if (r) {
1011 if (r != -ENODATA || !create)
1012 return r;
1013
Mike Snitzer1f3db252012-03-07 19:09:41 +00001014 /*
1015 * Create new device.
1016 */
Joe Thornber991d9fa2011-10-31 20:21:18 +00001017 changed = 1;
1018 details_le.mapped_blocks = 0;
1019 details_le.transaction_id = cpu_to_le64(pmd->trans_id);
1020 details_le.creation_time = cpu_to_le32(pmd->time);
1021 details_le.snapshotted_time = cpu_to_le32(pmd->time);
1022 }
1023
1024 *td = kmalloc(sizeof(**td), GFP_NOIO);
1025 if (!*td)
1026 return -ENOMEM;
1027
1028 (*td)->pmd = pmd;
1029 (*td)->id = dev;
1030 (*td)->open_count = 1;
1031 (*td)->changed = changed;
Joe Thornberda105ed2012-07-27 15:08:15 +01001032 (*td)->aborted_with_changes = false;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001033 (*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks);
1034 (*td)->transaction_id = le64_to_cpu(details_le.transaction_id);
1035 (*td)->creation_time = le32_to_cpu(details_le.creation_time);
1036 (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time);
1037
1038 list_add(&(*td)->list, &pmd->thin_devices);
1039
1040 return 0;
1041}
1042
1043static void __close_device(struct dm_thin_device *td)
1044{
1045 --td->open_count;
1046}
1047
1048static int __create_thin(struct dm_pool_metadata *pmd,
1049 dm_thin_id dev)
1050{
1051 int r;
1052 dm_block_t dev_root;
1053 uint64_t key = dev;
1054 struct disk_device_details details_le;
1055 struct dm_thin_device *td;
1056 __le64 value;
1057
1058 r = dm_btree_lookup(&pmd->details_info, pmd->details_root,
1059 &key, &details_le);
1060 if (!r)
1061 return -EEXIST;
1062
1063 /*
1064 * Create an empty btree for the mappings.
1065 */
1066 r = dm_btree_empty(&pmd->bl_info, &dev_root);
1067 if (r)
1068 return r;
1069
1070 /*
1071 * Insert it into the main mapping tree.
1072 */
1073 value = cpu_to_le64(dev_root);
1074 __dm_bless_for_disk(&value);
1075 r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root);
1076 if (r) {
1077 dm_btree_del(&pmd->bl_info, dev_root);
1078 return r;
1079 }
1080
1081 r = __open_device(pmd, dev, 1, &td);
1082 if (r) {
Joe Thornber991d9fa2011-10-31 20:21:18 +00001083 dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
1084 dm_btree_del(&pmd->bl_info, dev_root);
1085 return r;
1086 }
Joe Thornber991d9fa2011-10-31 20:21:18 +00001087 __close_device(td);
1088
1089 return r;
1090}
1091
1092int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev)
1093{
Joe Thornberda105ed2012-07-27 15:08:15 +01001094 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001095
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001096 pmd_write_lock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001097 if (!pmd->fail_io)
1098 r = __create_thin(pmd, dev);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001099 pmd_write_unlock(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001100
1101 return r;
1102}
1103
1104static int __set_snapshot_details(struct dm_pool_metadata *pmd,
1105 struct dm_thin_device *snap,
1106 dm_thin_id origin, uint32_t time)
1107{
1108 int r;
1109 struct dm_thin_device *td;
1110
1111 r = __open_device(pmd, origin, 0, &td);
1112 if (r)
1113 return r;
1114
zhengbin63ee92d2019-12-24 14:38:03 +08001115 td->changed = true;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001116 td->snapshotted_time = time;
1117
1118 snap->mapped_blocks = td->mapped_blocks;
1119 snap->snapshotted_time = time;
1120 __close_device(td);
1121
1122 return 0;
1123}
1124
1125static int __create_snap(struct dm_pool_metadata *pmd,
1126 dm_thin_id dev, dm_thin_id origin)
1127{
1128 int r;
1129 dm_block_t origin_root;
1130 uint64_t key = origin, dev_key = dev;
1131 struct dm_thin_device *td;
1132 struct disk_device_details details_le;
1133 __le64 value;
1134
1135 /* check this device is unused */
1136 r = dm_btree_lookup(&pmd->details_info, pmd->details_root,
1137 &dev_key, &details_le);
1138 if (!r)
1139 return -EEXIST;
1140
1141 /* find the mapping tree for the origin */
1142 r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value);
1143 if (r)
1144 return r;
1145 origin_root = le64_to_cpu(value);
1146
1147 /* clone the origin, an inc will do */
1148 dm_tm_inc(pmd->tm, origin_root);
1149
1150 /* insert into the main mapping tree */
1151 value = cpu_to_le64(origin_root);
1152 __dm_bless_for_disk(&value);
1153 key = dev;
1154 r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root);
1155 if (r) {
1156 dm_tm_dec(pmd->tm, origin_root);
1157 return r;
1158 }
1159
1160 pmd->time++;
1161
1162 r = __open_device(pmd, dev, 1, &td);
1163 if (r)
1164 goto bad;
1165
1166 r = __set_snapshot_details(pmd, td, origin, pmd->time);
Mike Snitzer1f3db252012-03-07 19:09:41 +00001167 __close_device(td);
1168
Joe Thornber991d9fa2011-10-31 20:21:18 +00001169 if (r)
1170 goto bad;
1171
Joe Thornber991d9fa2011-10-31 20:21:18 +00001172 return 0;
1173
1174bad:
Joe Thornber991d9fa2011-10-31 20:21:18 +00001175 dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
1176 dm_btree_remove(&pmd->details_info, pmd->details_root,
1177 &key, &pmd->details_root);
1178 return r;
1179}
1180
1181int dm_pool_create_snap(struct dm_pool_metadata *pmd,
1182 dm_thin_id dev,
1183 dm_thin_id origin)
1184{
Joe Thornberda105ed2012-07-27 15:08:15 +01001185 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001186
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001187 pmd_write_lock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001188 if (!pmd->fail_io)
1189 r = __create_snap(pmd, dev, origin);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001190 pmd_write_unlock(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001191
1192 return r;
1193}
1194
1195static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev)
1196{
1197 int r;
1198 uint64_t key = dev;
1199 struct dm_thin_device *td;
1200
1201 /* TODO: failure should mark the transaction invalid */
1202 r = __open_device(pmd, dev, 0, &td);
1203 if (r)
1204 return r;
1205
1206 if (td->open_count > 1) {
1207 __close_device(td);
1208 return -EBUSY;
1209 }
1210
1211 list_del(&td->list);
1212 kfree(td);
1213 r = dm_btree_remove(&pmd->details_info, pmd->details_root,
1214 &key, &pmd->details_root);
1215 if (r)
1216 return r;
1217
1218 r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
1219 if (r)
1220 return r;
1221
Joe Thornber991d9fa2011-10-31 20:21:18 +00001222 return 0;
1223}
1224
1225int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd,
1226 dm_thin_id dev)
1227{
Joe Thornberda105ed2012-07-27 15:08:15 +01001228 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001229
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001230 pmd_write_lock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001231 if (!pmd->fail_io)
1232 r = __delete_device(pmd, dev);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001233 pmd_write_unlock(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001234
1235 return r;
1236}
1237
1238int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd,
1239 uint64_t current_id,
1240 uint64_t new_id)
1241{
Joe Thornberda105ed2012-07-27 15:08:15 +01001242 int r = -EINVAL;
1243
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001244 pmd_write_lock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001245
1246 if (pmd->fail_io)
1247 goto out;
1248
Joe Thornber991d9fa2011-10-31 20:21:18 +00001249 if (pmd->trans_id != current_id) {
Joe Thornber991d9fa2011-10-31 20:21:18 +00001250 DMERR("mismatched transaction id");
Joe Thornberda105ed2012-07-27 15:08:15 +01001251 goto out;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001252 }
1253
1254 pmd->trans_id = new_id;
Joe Thornberda105ed2012-07-27 15:08:15 +01001255 r = 0;
1256
1257out:
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001258 pmd_write_unlock(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001259
Joe Thornberda105ed2012-07-27 15:08:15 +01001260 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001261}
1262
1263int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd,
1264 uint64_t *result)
1265{
Joe Thornberda105ed2012-07-27 15:08:15 +01001266 int r = -EINVAL;
1267
Joe Thornber991d9fa2011-10-31 20:21:18 +00001268 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001269 if (!pmd->fail_io) {
1270 *result = pmd->trans_id;
1271 r = 0;
1272 }
Joe Thornber991d9fa2011-10-31 20:21:18 +00001273 up_read(&pmd->root_lock);
1274
Joe Thornberda105ed2012-07-27 15:08:15 +01001275 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001276}
1277
Joe Thornbercc8394d2012-06-03 00:30:01 +01001278static int __reserve_metadata_snap(struct dm_pool_metadata *pmd)
1279{
1280 int r, inc;
1281 struct thin_disk_superblock *disk_super;
1282 struct dm_block *copy, *sblock;
1283 dm_block_t held_root;
1284
1285 /*
Joe Thornber49e99fc2015-12-09 16:23:24 +00001286 * We commit to ensure the btree roots which we increment in a
1287 * moment are up to date.
1288 */
Mike Snitzera1ed4d92019-04-15 16:40:08 -04001289 r = __commit_transaction(pmd);
1290 if (r < 0) {
1291 DMWARN("%s: __commit_transaction() failed, error = %d",
1292 __func__, r);
1293 return r;
1294 }
Joe Thornber49e99fc2015-12-09 16:23:24 +00001295
1296 /*
Joe Thornbercc8394d2012-06-03 00:30:01 +01001297 * Copy the superblock.
1298 */
1299 dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION);
1300 r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION,
1301 &sb_validator, &copy, &inc);
1302 if (r)
1303 return r;
1304
1305 BUG_ON(!inc);
1306
1307 held_root = dm_block_location(copy);
1308 disk_super = dm_block_data(copy);
1309
1310 if (le64_to_cpu(disk_super->held_root)) {
1311 DMWARN("Pool metadata snapshot already exists: release this before taking another.");
1312
1313 dm_tm_dec(pmd->tm, held_root);
1314 dm_tm_unlock(pmd->tm, copy);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001315 return -EBUSY;
1316 }
1317
1318 /*
1319 * Wipe the spacemap since we're not publishing this.
1320 */
1321 memset(&disk_super->data_space_map_root, 0,
1322 sizeof(disk_super->data_space_map_root));
1323 memset(&disk_super->metadata_space_map_root, 0,
1324 sizeof(disk_super->metadata_space_map_root));
1325
1326 /*
1327 * Increment the data structures that need to be preserved.
1328 */
1329 dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root));
1330 dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root));
1331 dm_tm_unlock(pmd->tm, copy);
1332
1333 /*
1334 * Write the held root into the superblock.
1335 */
Joe Thornber25971192012-07-27 15:08:09 +01001336 r = superblock_lock(pmd, &sblock);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001337 if (r) {
1338 dm_tm_dec(pmd->tm, held_root);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001339 return r;
1340 }
1341
1342 disk_super = dm_block_data(sblock);
1343 disk_super->held_root = cpu_to_le64(held_root);
1344 dm_bm_unlock(sblock);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001345 return 0;
1346}
1347
1348int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd)
1349{
Joe Thornberda105ed2012-07-27 15:08:15 +01001350 int r = -EINVAL;
Joe Thornbercc8394d2012-06-03 00:30:01 +01001351
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001352 pmd_write_lock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001353 if (!pmd->fail_io)
1354 r = __reserve_metadata_snap(pmd);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001355 pmd_write_unlock(pmd);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001356
1357 return r;
1358}
1359
1360static int __release_metadata_snap(struct dm_pool_metadata *pmd)
1361{
1362 int r;
1363 struct thin_disk_superblock *disk_super;
1364 struct dm_block *sblock, *copy;
1365 dm_block_t held_root;
1366
Joe Thornber25971192012-07-27 15:08:09 +01001367 r = superblock_lock(pmd, &sblock);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001368 if (r)
1369 return r;
1370
1371 disk_super = dm_block_data(sblock);
1372 held_root = le64_to_cpu(disk_super->held_root);
1373 disk_super->held_root = cpu_to_le64(0);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001374
1375 dm_bm_unlock(sblock);
1376
1377 if (!held_root) {
1378 DMWARN("No pool metadata snapshot found: nothing to release.");
1379 return -EINVAL;
1380 }
1381
1382 r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, &copy);
1383 if (r)
1384 return r;
1385
1386 disk_super = dm_block_data(copy);
Joe Thornber7f518ad2015-08-12 15:10:21 +01001387 dm_btree_del(&pmd->info, le64_to_cpu(disk_super->data_mapping_root));
1388 dm_btree_del(&pmd->details_info, le64_to_cpu(disk_super->device_details_root));
Joe Thornbercc8394d2012-06-03 00:30:01 +01001389 dm_sm_dec_block(pmd->metadata_sm, held_root);
1390
Mikulas Patocka4c7da062015-10-22 16:46:59 -04001391 dm_tm_unlock(pmd->tm, copy);
1392
1393 return 0;
Joe Thornbercc8394d2012-06-03 00:30:01 +01001394}
1395
1396int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd)
1397{
Joe Thornberda105ed2012-07-27 15:08:15 +01001398 int r = -EINVAL;
Joe Thornbercc8394d2012-06-03 00:30:01 +01001399
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001400 pmd_write_lock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001401 if (!pmd->fail_io)
1402 r = __release_metadata_snap(pmd);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001403 pmd_write_unlock(pmd);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001404
1405 return r;
1406}
1407
1408static int __get_metadata_snap(struct dm_pool_metadata *pmd,
1409 dm_block_t *result)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001410{
1411 int r;
1412 struct thin_disk_superblock *disk_super;
1413 struct dm_block *sblock;
1414
Joe Thornbercc8394d2012-06-03 00:30:01 +01001415 r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
1416 &sb_validator, &sblock);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001417 if (r)
1418 return r;
1419
1420 disk_super = dm_block_data(sblock);
1421 *result = le64_to_cpu(disk_super->held_root);
1422
Mikulas Patocka4c7da062015-10-22 16:46:59 -04001423 dm_bm_unlock(sblock);
1424
1425 return 0;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001426}
1427
Joe Thornbercc8394d2012-06-03 00:30:01 +01001428int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd,
1429 dm_block_t *result)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001430{
Joe Thornberda105ed2012-07-27 15:08:15 +01001431 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001432
1433 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001434 if (!pmd->fail_io)
1435 r = __get_metadata_snap(pmd, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001436 up_read(&pmd->root_lock);
1437
1438 return r;
1439}
1440
1441int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev,
1442 struct dm_thin_device **td)
1443{
Joe Thornberda105ed2012-07-27 15:08:15 +01001444 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001445
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001446 pmd_write_lock_in_core(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001447 if (!pmd->fail_io)
1448 r = __open_device(pmd, dev, 0, td);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001449 pmd_write_unlock(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001450
1451 return r;
1452}
1453
1454int dm_pool_close_thin_device(struct dm_thin_device *td)
1455{
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001456 pmd_write_lock_in_core(td->pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001457 __close_device(td);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001458 pmd_write_unlock(td->pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001459
1460 return 0;
1461}
1462
1463dm_thin_id dm_thin_dev_id(struct dm_thin_device *td)
1464{
1465 return td->id;
1466}
1467
Joe Thornber19fa1a62013-12-17 12:09:40 -05001468/*
1469 * Check whether @time (of block creation) is older than @td's last snapshot.
1470 * If so then the associated block is shared with the last snapshot device.
1471 * Any block on a device created *after* the device last got snapshotted is
1472 * necessarily not shared.
1473 */
Mike Snitzer17b7d632012-07-27 15:07:57 +01001474static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001475{
1476 return td->snapshotted_time > time;
1477}
1478
Joe Thornber3d5f6732015-11-05 15:10:11 +00001479static void unpack_lookup_result(struct dm_thin_device *td, __le64 value,
1480 struct dm_thin_lookup_result *result)
1481{
1482 uint64_t block_time = 0;
1483 dm_block_t exception_block;
1484 uint32_t exception_time;
1485
1486 block_time = le64_to_cpu(value);
1487 unpack_block_time(block_time, &exception_block, &exception_time);
1488 result->block = exception_block;
1489 result->shared = __snapshotted_since(td, exception_time);
1490}
1491
Joe Thornber086fbbb2015-12-07 14:48:04 +00001492static int __find_block(struct dm_thin_device *td, dm_block_t block,
1493 int can_issue_io, struct dm_thin_lookup_result *result)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001494{
Joe Thornbere5cfc692014-10-06 15:24:55 +01001495 int r;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001496 __le64 value;
1497 struct dm_pool_metadata *pmd = td->pmd;
1498 dm_block_t keys[2] = { td->id, block };
Joe Thornberda105ed2012-07-27 15:08:15 +01001499 struct dm_btree_info *info;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001500
Joe Thornbere5cfc692014-10-06 15:24:55 +01001501 if (can_issue_io) {
1502 info = &pmd->info;
1503 } else
1504 info = &pmd->nb_info;
Joe Thornberda105ed2012-07-27 15:08:15 +01001505
1506 r = dm_btree_lookup(info, pmd->root, keys, &value);
Joe Thornber3d5f6732015-11-05 15:10:11 +00001507 if (!r)
1508 unpack_lookup_result(td, value, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001509
Joe Thornber086fbbb2015-12-07 14:48:04 +00001510 return r;
1511}
1512
1513int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block,
1514 int can_issue_io, struct dm_thin_lookup_result *result)
1515{
1516 int r;
1517 struct dm_pool_metadata *pmd = td->pmd;
1518
1519 down_read(&pmd->root_lock);
1520 if (pmd->fail_io) {
1521 up_read(&pmd->root_lock);
1522 return -EINVAL;
1523 }
1524
1525 r = __find_block(td, block, can_issue_io, result);
1526
Joe Thornbere5cfc692014-10-06 15:24:55 +01001527 up_read(&pmd->root_lock);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001528 return r;
1529}
1530
Joe Thornber086fbbb2015-12-07 14:48:04 +00001531static int __find_next_mapped_block(struct dm_thin_device *td, dm_block_t block,
Joe Thornber3d5f6732015-11-05 15:10:11 +00001532 dm_block_t *vblock,
1533 struct dm_thin_lookup_result *result)
1534{
1535 int r;
1536 __le64 value;
1537 struct dm_pool_metadata *pmd = td->pmd;
1538 dm_block_t keys[2] = { td->id, block };
1539
Joe Thornber3d5f6732015-11-05 15:10:11 +00001540 r = dm_btree_lookup_next(&pmd->info, pmd->root, keys, vblock, &value);
1541 if (!r)
1542 unpack_lookup_result(td, value, result);
1543
Joe Thornber3d5f6732015-11-05 15:10:11 +00001544 return r;
1545}
1546
Joe Thornber086fbbb2015-12-07 14:48:04 +00001547static int __find_mapped_range(struct dm_thin_device *td,
1548 dm_block_t begin, dm_block_t end,
1549 dm_block_t *thin_begin, dm_block_t *thin_end,
1550 dm_block_t *pool_begin, bool *maybe_shared)
Joe Thornbera5d895a2015-04-16 12:47:21 +01001551{
1552 int r;
1553 dm_block_t pool_end;
1554 struct dm_thin_lookup_result lookup;
1555
1556 if (end < begin)
1557 return -ENODATA;
1558
Joe Thornber086fbbb2015-12-07 14:48:04 +00001559 r = __find_next_mapped_block(td, begin, &begin, &lookup);
Joe Thornber3d5f6732015-11-05 15:10:11 +00001560 if (r)
1561 return r;
Joe Thornbera5d895a2015-04-16 12:47:21 +01001562
Joe Thornber3d5f6732015-11-05 15:10:11 +00001563 if (begin >= end)
Joe Thornbera5d895a2015-04-16 12:47:21 +01001564 return -ENODATA;
1565
1566 *thin_begin = begin;
1567 *pool_begin = lookup.block;
1568 *maybe_shared = lookup.shared;
1569
1570 begin++;
1571 pool_end = *pool_begin + 1;
1572 while (begin != end) {
Joe Thornber086fbbb2015-12-07 14:48:04 +00001573 r = __find_block(td, begin, true, &lookup);
Joe Thornbera5d895a2015-04-16 12:47:21 +01001574 if (r) {
1575 if (r == -ENODATA)
1576 break;
1577 else
1578 return r;
1579 }
1580
1581 if ((lookup.block != pool_end) ||
1582 (lookup.shared != *maybe_shared))
1583 break;
1584
1585 pool_end++;
1586 begin++;
1587 }
1588
1589 *thin_end = begin;
1590 return 0;
1591}
1592
Joe Thornber086fbbb2015-12-07 14:48:04 +00001593int dm_thin_find_mapped_range(struct dm_thin_device *td,
1594 dm_block_t begin, dm_block_t end,
1595 dm_block_t *thin_begin, dm_block_t *thin_end,
1596 dm_block_t *pool_begin, bool *maybe_shared)
1597{
1598 int r = -EINVAL;
1599 struct dm_pool_metadata *pmd = td->pmd;
1600
1601 down_read(&pmd->root_lock);
1602 if (!pmd->fail_io) {
1603 r = __find_mapped_range(td, begin, end, thin_begin, thin_end,
1604 pool_begin, maybe_shared);
1605 }
1606 up_read(&pmd->root_lock);
1607
1608 return r;
1609}
1610
Joe Thornber991d9fa2011-10-31 20:21:18 +00001611static int __insert(struct dm_thin_device *td, dm_block_t block,
1612 dm_block_t data_block)
1613{
1614 int r, inserted;
1615 __le64 value;
1616 struct dm_pool_metadata *pmd = td->pmd;
1617 dm_block_t keys[2] = { td->id, block };
1618
Joe Thornber991d9fa2011-10-31 20:21:18 +00001619 value = cpu_to_le64(pack_block_time(data_block, pmd->time));
1620 __dm_bless_for_disk(&value);
1621
1622 r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value,
1623 &pmd->root, &inserted);
1624 if (r)
1625 return r;
1626
zhengbin63ee92d2019-12-24 14:38:03 +08001627 td->changed = true;
Joe Thornber40db5a52012-07-27 15:08:14 +01001628 if (inserted)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001629 td->mapped_blocks++;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001630
1631 return 0;
1632}
1633
1634int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block,
1635 dm_block_t data_block)
1636{
Joe Thornberda105ed2012-07-27 15:08:15 +01001637 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001638
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001639 pmd_write_lock(td->pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001640 if (!td->pmd->fail_io)
1641 r = __insert(td, block, data_block);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001642 pmd_write_unlock(td->pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001643
1644 return r;
1645}
1646
1647static int __remove(struct dm_thin_device *td, dm_block_t block)
1648{
1649 int r;
1650 struct dm_pool_metadata *pmd = td->pmd;
1651 dm_block_t keys[2] = { td->id, block };
1652
1653 r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root);
1654 if (r)
1655 return r;
1656
Joe Thornberaf63bcb2012-03-07 19:09:44 +00001657 td->mapped_blocks--;
zhengbin63ee92d2019-12-24 14:38:03 +08001658 td->changed = true;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001659
1660 return 0;
1661}
1662
Joe Thornber6550f072015-04-13 09:45:25 +01001663static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end)
1664{
1665 int r;
Joe Thornber993ceab2015-12-02 12:24:39 +00001666 unsigned count, total_count = 0;
Joe Thornber6550f072015-04-13 09:45:25 +01001667 struct dm_pool_metadata *pmd = td->pmd;
1668 dm_block_t keys[1] = { td->id };
1669 __le64 value;
1670 dm_block_t mapping_root;
1671
1672 /*
1673 * Find the mapping tree
1674 */
1675 r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value);
1676 if (r)
1677 return r;
1678
1679 /*
1680 * Remove from the mapping tree, taking care to inc the
1681 * ref count so it doesn't get deleted.
1682 */
1683 mapping_root = le64_to_cpu(value);
1684 dm_tm_inc(pmd->tm, mapping_root);
1685 r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root);
1686 if (r)
1687 return r;
1688
Joe Thornber993ceab2015-12-02 12:24:39 +00001689 /*
1690 * Remove leaves stops at the first unmapped entry, so we have to
1691 * loop round finding mapped ranges.
1692 */
1693 while (begin < end) {
1694 r = dm_btree_lookup_next(&pmd->bl_info, mapping_root, &begin, &begin, &value);
1695 if (r == -ENODATA)
1696 break;
Joe Thornber6550f072015-04-13 09:45:25 +01001697
Joe Thornber993ceab2015-12-02 12:24:39 +00001698 if (r)
1699 return r;
1700
1701 if (begin >= end)
1702 break;
1703
1704 r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count);
1705 if (r)
1706 return r;
1707
1708 total_count += count;
1709 }
1710
1711 td->mapped_blocks -= total_count;
zhengbin63ee92d2019-12-24 14:38:03 +08001712 td->changed = true;
Joe Thornber6550f072015-04-13 09:45:25 +01001713
1714 /*
1715 * Reinsert the mapping tree.
1716 */
1717 value = cpu_to_le64(mapping_root);
1718 __dm_bless_for_disk(&value);
1719 return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root);
1720}
1721
Joe Thornber991d9fa2011-10-31 20:21:18 +00001722int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block)
1723{
Joe Thornberda105ed2012-07-27 15:08:15 +01001724 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001725
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001726 pmd_write_lock(td->pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001727 if (!td->pmd->fail_io)
1728 r = __remove(td, block);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001729 pmd_write_unlock(td->pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001730
1731 return r;
1732}
1733
Joe Thornber6550f072015-04-13 09:45:25 +01001734int dm_thin_remove_range(struct dm_thin_device *td,
1735 dm_block_t begin, dm_block_t end)
1736{
1737 int r = -EINVAL;
1738
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001739 pmd_write_lock(td->pmd);
Joe Thornber6550f072015-04-13 09:45:25 +01001740 if (!td->pmd->fail_io)
1741 r = __remove_range(td, begin, end);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001742 pmd_write_unlock(td->pmd);
Joe Thornber6550f072015-04-13 09:45:25 +01001743
1744 return r;
1745}
1746
Joe Thornberd445bd92019-01-15 13:27:01 -05001747int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result)
Joe Thornber19fa1a62013-12-17 12:09:40 -05001748{
1749 int r;
1750 uint32_t ref_count;
1751
1752 down_read(&pmd->root_lock);
1753 r = dm_sm_get_count(pmd->data_sm, b, &ref_count);
1754 if (!r)
Joe Thornberd445bd92019-01-15 13:27:01 -05001755 *result = (ref_count > 1);
Joe Thornber19fa1a62013-12-17 12:09:40 -05001756 up_read(&pmd->root_lock);
1757
1758 return r;
1759}
1760
Joe Thornber2a0fbff2016-07-01 14:00:02 +01001761int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e)
1762{
1763 int r = 0;
1764
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001765 pmd_write_lock(pmd);
Joe Thornber2a0fbff2016-07-01 14:00:02 +01001766 for (; b != e; b++) {
1767 r = dm_sm_inc_block(pmd->data_sm, b);
1768 if (r)
1769 break;
1770 }
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001771 pmd_write_unlock(pmd);
Joe Thornber2a0fbff2016-07-01 14:00:02 +01001772
1773 return r;
1774}
1775
1776int dm_pool_dec_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e)
1777{
1778 int r = 0;
1779
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001780 pmd_write_lock(pmd);
Joe Thornber2a0fbff2016-07-01 14:00:02 +01001781 for (; b != e; b++) {
1782 r = dm_sm_dec_block(pmd->data_sm, b);
1783 if (r)
1784 break;
1785 }
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001786 pmd_write_unlock(pmd);
Joe Thornber2a0fbff2016-07-01 14:00:02 +01001787
1788 return r;
1789}
1790
Joe Thornber40db5a52012-07-27 15:08:14 +01001791bool dm_thin_changed_this_transaction(struct dm_thin_device *td)
1792{
1793 int r;
1794
1795 down_read(&td->pmd->root_lock);
1796 r = td->changed;
1797 up_read(&td->pmd->root_lock);
1798
1799 return r;
1800}
1801
Mike Snitzer4d1662a2014-02-06 06:08:56 -05001802bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd)
1803{
1804 bool r = false;
1805 struct dm_thin_device *td, *tmp;
1806
1807 down_read(&pmd->root_lock);
1808 list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) {
1809 if (td->changed) {
1810 r = td->changed;
1811 break;
1812 }
1813 }
1814 up_read(&pmd->root_lock);
1815
1816 return r;
1817}
1818
Joe Thornberda105ed2012-07-27 15:08:15 +01001819bool dm_thin_aborted_changes(struct dm_thin_device *td)
1820{
1821 bool r;
1822
1823 down_read(&td->pmd->root_lock);
1824 r = td->aborted_with_changes;
1825 up_read(&td->pmd->root_lock);
1826
1827 return r;
1828}
1829
Joe Thornber991d9fa2011-10-31 20:21:18 +00001830int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result)
1831{
Joe Thornberda105ed2012-07-27 15:08:15 +01001832 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001833
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001834 pmd_write_lock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001835 if (!pmd->fail_io)
1836 r = dm_sm_new_block(pmd->data_sm, result);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001837 pmd_write_unlock(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001838
1839 return r;
1840}
1841
1842int dm_pool_commit_metadata(struct dm_pool_metadata *pmd)
1843{
Joe Thornberda105ed2012-07-27 15:08:15 +01001844 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001845
Mike Snitzer873f2582019-04-18 10:29:48 -04001846 /*
1847 * Care is taken to not have commit be what
1848 * triggers putting the thin-pool in-service.
1849 */
Mike Snitzer44d8ebf2020-01-13 11:18:51 -05001850 pmd_write_lock_in_core(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001851 if (pmd->fail_io)
1852 goto out;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001853
1854 r = __commit_transaction(pmd);
Mike Snitzer873f2582019-04-18 10:29:48 -04001855 if (r < 0)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001856 goto out;
1857
1858 /*
1859 * Open the next transaction.
1860 */
1861 r = __begin_transaction(pmd);
1862out:
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001863 pmd_write_unlock(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001864 return r;
1865}
1866
Joe Thornberda105ed2012-07-27 15:08:15 +01001867static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd)
1868{
1869 struct dm_thin_device *td;
1870
1871 list_for_each_entry(td, &pmd->thin_devices, list)
1872 td->aborted_with_changes = td->changed;
1873}
1874
1875int dm_pool_abort_metadata(struct dm_pool_metadata *pmd)
1876{
1877 int r = -EINVAL;
1878
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001879 pmd_write_lock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001880 if (pmd->fail_io)
1881 goto out;
1882
1883 __set_abort_with_changes_flags(pmd);
1884 __destroy_persistent_data_objects(pmd);
1885 r = __create_persistent_data_objects(pmd, false);
1886 if (r)
1887 pmd->fail_io = true;
1888
1889out:
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04001890 pmd_write_unlock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01001891
1892 return r;
1893}
1894
Joe Thornber991d9fa2011-10-31 20:21:18 +00001895int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result)
1896{
Joe Thornberda105ed2012-07-27 15:08:15 +01001897 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001898
1899 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001900 if (!pmd->fail_io)
1901 r = dm_sm_get_nr_free(pmd->data_sm, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001902 up_read(&pmd->root_lock);
1903
1904 return r;
1905}
1906
1907int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd,
1908 dm_block_t *result)
1909{
Joe Thornberda105ed2012-07-27 15:08:15 +01001910 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001911
1912 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001913 if (!pmd->fail_io)
1914 r = dm_sm_get_nr_free(pmd->metadata_sm, result);
Joe Thornber3ab91822018-09-10 16:50:09 +01001915
1916 if (!r) {
1917 if (*result < pmd->metadata_reserve)
1918 *result = 0;
1919 else
1920 *result -= pmd->metadata_reserve;
1921 }
Joe Thornber991d9fa2011-10-31 20:21:18 +00001922 up_read(&pmd->root_lock);
1923
1924 return r;
1925}
1926
1927int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd,
1928 dm_block_t *result)
1929{
Joe Thornberda105ed2012-07-27 15:08:15 +01001930 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001931
1932 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001933 if (!pmd->fail_io)
1934 r = dm_sm_get_nr_blocks(pmd->metadata_sm, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001935 up_read(&pmd->root_lock);
1936
1937 return r;
1938}
1939
Joe Thornber991d9fa2011-10-31 20:21:18 +00001940int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result)
1941{
Joe Thornberda105ed2012-07-27 15:08:15 +01001942 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001943
1944 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001945 if (!pmd->fail_io)
1946 r = dm_sm_get_nr_blocks(pmd->data_sm, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001947 up_read(&pmd->root_lock);
1948
1949 return r;
1950}
1951
1952int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result)
1953{
Joe Thornberda105ed2012-07-27 15:08:15 +01001954 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001955 struct dm_pool_metadata *pmd = td->pmd;
1956
1957 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001958 if (!pmd->fail_io) {
1959 *result = td->mapped_blocks;
1960 r = 0;
1961 }
Joe Thornber991d9fa2011-10-31 20:21:18 +00001962 up_read(&pmd->root_lock);
1963
Joe Thornberda105ed2012-07-27 15:08:15 +01001964 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001965}
1966
1967static int __highest_block(struct dm_thin_device *td, dm_block_t *result)
1968{
1969 int r;
1970 __le64 value_le;
1971 dm_block_t thin_root;
1972 struct dm_pool_metadata *pmd = td->pmd;
1973
1974 r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le);
1975 if (r)
1976 return r;
1977
1978 thin_root = le64_to_cpu(value_le);
1979
1980 return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result);
1981}
1982
1983int dm_thin_get_highest_mapped_block(struct dm_thin_device *td,
1984 dm_block_t *result)
1985{
Joe Thornberda105ed2012-07-27 15:08:15 +01001986 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001987 struct dm_pool_metadata *pmd = td->pmd;
1988
1989 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001990 if (!pmd->fail_io)
1991 r = __highest_block(td, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001992 up_read(&pmd->root_lock);
1993
1994 return r;
1995}
1996
Joe Thornberb17446d2013-05-10 14:37:18 +01001997static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001998{
1999 int r;
2000 dm_block_t old_count;
2001
Joe Thornberb17446d2013-05-10 14:37:18 +01002002 r = dm_sm_get_nr_blocks(sm, &old_count);
Joe Thornber991d9fa2011-10-31 20:21:18 +00002003 if (r)
2004 return r;
2005
2006 if (new_count == old_count)
2007 return 0;
2008
2009 if (new_count < old_count) {
Joe Thornberb17446d2013-05-10 14:37:18 +01002010 DMERR("cannot reduce size of space map");
Joe Thornber991d9fa2011-10-31 20:21:18 +00002011 return -EINVAL;
2012 }
2013
Joe Thornberb17446d2013-05-10 14:37:18 +01002014 return dm_sm_extend(sm, new_count - old_count);
Joe Thornber991d9fa2011-10-31 20:21:18 +00002015}
2016
2017int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count)
2018{
Joe Thornberda105ed2012-07-27 15:08:15 +01002019 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00002020
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002021 pmd_write_lock(pmd);
Joe Thornberda105ed2012-07-27 15:08:15 +01002022 if (!pmd->fail_io)
Joe Thornberb17446d2013-05-10 14:37:18 +01002023 r = __resize_space_map(pmd->data_sm, new_count);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002024 pmd_write_unlock(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +00002025
2026 return r;
2027}
Joe Thornber12ba58a2012-07-27 15:08:15 +01002028
Joe Thornber24347e92013-05-10 14:37:19 +01002029int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count)
2030{
2031 int r = -EINVAL;
2032
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002033 pmd_write_lock(pmd);
Joe Thornber3ab91822018-09-10 16:50:09 +01002034 if (!pmd->fail_io) {
Joe Thornber24347e92013-05-10 14:37:19 +01002035 r = __resize_space_map(pmd->metadata_sm, new_count);
Joe Thornber3ab91822018-09-10 16:50:09 +01002036 if (!r)
2037 __set_metadata_reserve(pmd);
2038 }
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002039 pmd_write_unlock(pmd);
Joe Thornber24347e92013-05-10 14:37:19 +01002040
2041 return r;
2042}
2043
Joe Thornber12ba58a2012-07-27 15:08:15 +01002044void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd)
2045{
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002046 pmd_write_lock_in_core(pmd);
Joe Thornber12ba58a2012-07-27 15:08:15 +01002047 dm_bm_set_read_only(pmd->bm);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002048 pmd_write_unlock(pmd);
Joe Thornber12ba58a2012-07-27 15:08:15 +01002049}
Joe Thornberac8c3f32013-05-10 14:37:21 +01002050
Joe Thornber9b7aaa62013-12-04 16:58:19 -05002051void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd)
2052{
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002053 pmd_write_lock_in_core(pmd);
Joe Thornber9b7aaa62013-12-04 16:58:19 -05002054 dm_bm_set_read_write(pmd->bm);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002055 pmd_write_unlock(pmd);
Joe Thornber9b7aaa62013-12-04 16:58:19 -05002056}
2057
Joe Thornberac8c3f32013-05-10 14:37:21 +01002058int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
2059 dm_block_t threshold,
2060 dm_sm_threshold_fn fn,
2061 void *context)
2062{
2063 int r;
2064
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002065 pmd_write_lock_in_core(pmd);
Joe Thornberac8c3f32013-05-10 14:37:21 +01002066 r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context);
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002067 pmd_write_unlock(pmd);
Joe Thornberac8c3f32013-05-10 14:37:21 +01002068
2069 return r;
2070}
Mike Snitzer07f2b6e02014-02-14 11:58:41 -05002071
Nikos Tsironisecda7c02019-12-04 16:07:41 +02002072void dm_pool_register_pre_commit_callback(struct dm_pool_metadata *pmd,
2073 dm_pool_pre_commit_fn fn,
2074 void *context)
2075{
2076 pmd_write_lock_in_core(pmd);
2077 pmd->pre_commit_fn = fn;
2078 pmd->pre_commit_context = context;
2079 pmd_write_unlock(pmd);
2080}
2081
Mike Snitzer07f2b6e02014-02-14 11:58:41 -05002082int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd)
2083{
Mike Snitzer54fa16e2019-07-02 15:50:08 -04002084 int r = -EINVAL;
Mike Snitzer07f2b6e02014-02-14 11:58:41 -05002085 struct dm_block *sblock;
2086 struct thin_disk_superblock *disk_super;
2087
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002088 pmd_write_lock(pmd);
Mike Snitzer54fa16e2019-07-02 15:50:08 -04002089 if (pmd->fail_io)
2090 goto out;
2091
Mike Snitzer07f2b6e02014-02-14 11:58:41 -05002092 pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG;
2093
2094 r = superblock_lock(pmd, &sblock);
2095 if (r) {
Mike Snitzer54fa16e2019-07-02 15:50:08 -04002096 DMERR("couldn't lock superblock");
Mike Snitzer07f2b6e02014-02-14 11:58:41 -05002097 goto out;
2098 }
2099
2100 disk_super = dm_block_data(sblock);
2101 disk_super->flags = cpu_to_le32(pmd->flags);
2102
2103 dm_bm_unlock(sblock);
2104out:
Mike Snitzer6a1b1dd2019-04-15 16:54:36 -04002105 pmd_write_unlock(pmd);
Mike Snitzer07f2b6e02014-02-14 11:58:41 -05002106 return r;
2107}
2108
2109bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd)
2110{
2111 bool needs_check;
2112
2113 down_read(&pmd->root_lock);
2114 needs_check = pmd->flags & THIN_METADATA_NEEDS_CHECK_FLAG;
2115 up_read(&pmd->root_lock);
2116
2117 return needs_check;
2118}
Joe Thornber8a01a6a2014-10-06 15:28:30 +01002119
2120void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd)
2121{
Joe Thornber2eae9e42016-03-01 10:58:44 +00002122 down_read(&pmd->root_lock);
2123 if (!pmd->fail_io)
2124 dm_tm_issue_prefetches(pmd->tm);
2125 up_read(&pmd->root_lock);
Joe Thornber8a01a6a2014-10-06 15:28:30 +01002126}