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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
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
Mike Snitzer07f2b6e2014-02-14 11:58:41 -050079#define THIN_VERSION 2
Joe Thornber991d9fa2011-10-31 20:21:18 +000080#define THIN_METADATA_CACHE_SIZE 64
81#define SECTOR_TO_BLOCK_SHIFT 3
82
Joe Thornber8c971172012-07-27 15:07:58 +010083/*
84 * 3 for btree insert +
85 * 2 for btree lookup used within space map
86 */
87#define THIN_MAX_CONCURRENT_LOCKS 5
88
Joe Thornber991d9fa2011-10-31 20:21:18 +000089/* This should be plenty */
90#define SPACE_MAP_ROOT_SIZE 128
91
92/*
93 * Little endian on-disk superblock and device details.
94 */
95struct thin_disk_superblock {
96 __le32 csum; /* Checksum of superblock except for this field. */
97 __le32 flags;
98 __le64 blocknr; /* This block number, dm_block_t. */
99
100 __u8 uuid[16];
101 __le64 magic;
102 __le32 version;
103 __le32 time;
104
105 __le64 trans_id;
106
107 /*
108 * Root held by userspace transactions.
109 */
110 __le64 held_root;
111
112 __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE];
113 __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
114
115 /*
116 * 2-level btree mapping (dev_id, (dev block, time)) -> data block
117 */
118 __le64 data_mapping_root;
119
120 /*
121 * Device detail root mapping dev_id -> device_details
122 */
123 __le64 device_details_root;
124
125 __le32 data_block_size; /* In 512-byte sectors. */
126
127 __le32 metadata_block_size; /* In 512-byte sectors. */
128 __le64 metadata_nr_blocks;
129
130 __le32 compat_flags;
131 __le32 compat_ro_flags;
132 __le32 incompat_flags;
133} __packed;
134
135struct disk_device_details {
136 __le64 mapped_blocks;
137 __le64 transaction_id; /* When created. */
138 __le32 creation_time;
139 __le32 snapshotted_time;
140} __packed;
141
142struct dm_pool_metadata {
143 struct hlist_node hash;
144
145 struct block_device *bdev;
146 struct dm_block_manager *bm;
147 struct dm_space_map *metadata_sm;
148 struct dm_space_map *data_sm;
149 struct dm_transaction_manager *tm;
150 struct dm_transaction_manager *nb_tm;
151
152 /*
153 * Two-level btree.
154 * First level holds thin_dev_t.
155 * Second level holds mappings.
156 */
157 struct dm_btree_info info;
158
159 /*
160 * Non-blocking version of the above.
161 */
162 struct dm_btree_info nb_info;
163
164 /*
165 * Just the top level for deleting whole devices.
166 */
167 struct dm_btree_info tl_info;
168
169 /*
170 * Just the bottom level for creating new devices.
171 */
172 struct dm_btree_info bl_info;
173
174 /*
175 * Describes the device details btree.
176 */
177 struct dm_btree_info details_info;
178
179 struct rw_semaphore root_lock;
180 uint32_t time;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000181 dm_block_t root;
182 dm_block_t details_root;
183 struct list_head thin_devices;
184 uint64_t trans_id;
185 unsigned long flags;
186 sector_t data_block_size;
Joe Thornber12ba58a2012-07-27 15:08:15 +0100187 bool read_only:1;
Joe Thornberda105ed2012-07-27 15:08:15 +0100188
189 /*
190 * Set if a transaction has to be aborted but the attempt to roll back
191 * to the previous (good) transaction failed. The only pool metadata
192 * operation possible in this state is the closing of the device.
193 */
194 bool fail_io:1;
Joe Thornber5a320832014-03-27 14:13:23 +0000195
196 /*
197 * Reading the space map roots can fail, so we read it into these
198 * buffers before the superblock is locked and updated.
199 */
200 __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE];
201 __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
Joe Thornber991d9fa2011-10-31 20:21:18 +0000202};
203
204struct dm_thin_device {
205 struct list_head list;
206 struct dm_pool_metadata *pmd;
207 dm_thin_id id;
208
209 int open_count;
Joe Thornberda105ed2012-07-27 15:08:15 +0100210 bool changed:1;
211 bool aborted_with_changes:1;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000212 uint64_t mapped_blocks;
213 uint64_t transaction_id;
214 uint32_t creation_time;
215 uint32_t snapshotted_time;
216};
217
218/*----------------------------------------------------------------
219 * superblock validator
220 *--------------------------------------------------------------*/
221
222#define SUPERBLOCK_CSUM_XOR 160774
223
224static void sb_prepare_for_write(struct dm_block_validator *v,
225 struct dm_block *b,
226 size_t block_size)
227{
228 struct thin_disk_superblock *disk_super = dm_block_data(b);
229
230 disk_super->blocknr = cpu_to_le64(dm_block_location(b));
231 disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags,
232 block_size - sizeof(__le32),
233 SUPERBLOCK_CSUM_XOR));
234}
235
236static int sb_check(struct dm_block_validator *v,
237 struct dm_block *b,
238 size_t block_size)
239{
240 struct thin_disk_superblock *disk_super = dm_block_data(b);
241 __le32 csum_le;
242
243 if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) {
244 DMERR("sb_check failed: blocknr %llu: "
245 "wanted %llu", le64_to_cpu(disk_super->blocknr),
246 (unsigned long long)dm_block_location(b));
247 return -ENOTBLK;
248 }
249
250 if (le64_to_cpu(disk_super->magic) != THIN_SUPERBLOCK_MAGIC) {
251 DMERR("sb_check failed: magic %llu: "
252 "wanted %llu", le64_to_cpu(disk_super->magic),
253 (unsigned long long)THIN_SUPERBLOCK_MAGIC);
254 return -EILSEQ;
255 }
256
257 csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags,
258 block_size - sizeof(__le32),
259 SUPERBLOCK_CSUM_XOR));
260 if (csum_le != disk_super->csum) {
261 DMERR("sb_check failed: csum %u: wanted %u",
262 le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum));
263 return -EILSEQ;
264 }
265
266 return 0;
267}
268
269static struct dm_block_validator sb_validator = {
270 .name = "superblock",
271 .prepare_for_write = sb_prepare_for_write,
272 .check = sb_check
273};
274
275/*----------------------------------------------------------------
276 * Methods for the btree value types
277 *--------------------------------------------------------------*/
278
279static uint64_t pack_block_time(dm_block_t b, uint32_t t)
280{
281 return (b << 24) | t;
282}
283
284static void unpack_block_time(uint64_t v, dm_block_t *b, uint32_t *t)
285{
286 *b = v >> 24;
287 *t = v & ((1 << 24) - 1);
288}
289
Mike Snitzer018cede2013-03-01 22:45:47 +0000290static void data_block_inc(void *context, const void *value_le)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000291{
292 struct dm_space_map *sm = context;
293 __le64 v_le;
294 uint64_t b;
295 uint32_t t;
296
297 memcpy(&v_le, value_le, sizeof(v_le));
298 unpack_block_time(le64_to_cpu(v_le), &b, &t);
299 dm_sm_inc_block(sm, b);
300}
301
Mike Snitzer018cede2013-03-01 22:45:47 +0000302static void data_block_dec(void *context, const void *value_le)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000303{
304 struct dm_space_map *sm = context;
305 __le64 v_le;
306 uint64_t b;
307 uint32_t t;
308
309 memcpy(&v_le, value_le, sizeof(v_le));
310 unpack_block_time(le64_to_cpu(v_le), &b, &t);
311 dm_sm_dec_block(sm, b);
312}
313
Mike Snitzer018cede2013-03-01 22:45:47 +0000314static int data_block_equal(void *context, const void *value1_le, const void *value2_le)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000315{
316 __le64 v1_le, v2_le;
317 uint64_t b1, b2;
318 uint32_t t;
319
320 memcpy(&v1_le, value1_le, sizeof(v1_le));
321 memcpy(&v2_le, value2_le, sizeof(v2_le));
322 unpack_block_time(le64_to_cpu(v1_le), &b1, &t);
323 unpack_block_time(le64_to_cpu(v2_le), &b2, &t);
324
325 return b1 == b2;
326}
327
Mike Snitzer018cede2013-03-01 22:45:47 +0000328static void subtree_inc(void *context, const void *value)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000329{
330 struct dm_btree_info *info = context;
331 __le64 root_le;
332 uint64_t root;
333
334 memcpy(&root_le, value, sizeof(root_le));
335 root = le64_to_cpu(root_le);
336 dm_tm_inc(info->tm, root);
337}
338
Mike Snitzer018cede2013-03-01 22:45:47 +0000339static void subtree_dec(void *context, const void *value)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000340{
341 struct dm_btree_info *info = context;
342 __le64 root_le;
343 uint64_t root;
344
345 memcpy(&root_le, value, sizeof(root_le));
346 root = le64_to_cpu(root_le);
347 if (dm_btree_del(info, root))
348 DMERR("btree delete failed\n");
349}
350
Mike Snitzer018cede2013-03-01 22:45:47 +0000351static int subtree_equal(void *context, const void *value1_le, const void *value2_le)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000352{
353 __le64 v1_le, v2_le;
354 memcpy(&v1_le, value1_le, sizeof(v1_le));
355 memcpy(&v2_le, value2_le, sizeof(v2_le));
356
357 return v1_le == v2_le;
358}
359
360/*----------------------------------------------------------------*/
361
Joe Thornber25971192012-07-27 15:08:09 +0100362static int superblock_lock_zero(struct dm_pool_metadata *pmd,
363 struct dm_block **sblock)
364{
365 return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION,
366 &sb_validator, sblock);
367}
368
369static int superblock_lock(struct dm_pool_metadata *pmd,
370 struct dm_block **sblock)
371{
372 return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
373 &sb_validator, sblock);
374}
375
Joe Thornber332627d2012-07-27 15:08:10 +0100376static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000377{
378 int r;
379 unsigned i;
380 struct dm_block *b;
381 __le64 *data_le, zero = cpu_to_le64(0);
382 unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64);
383
384 /*
385 * We can't use a validator here - it may be all zeroes.
386 */
387 r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b);
388 if (r)
389 return r;
390
391 data_le = dm_block_data(b);
392 *result = 1;
393 for (i = 0; i < block_size; i++) {
394 if (data_le[i] != zero) {
395 *result = 0;
396 break;
397 }
398 }
399
400 return dm_bm_unlock(b);
401}
402
Joe Thornber41675ae2012-07-27 15:08:08 +0100403static void __setup_btree_details(struct dm_pool_metadata *pmd)
404{
405 pmd->info.tm = pmd->tm;
406 pmd->info.levels = 2;
407 pmd->info.value_type.context = pmd->data_sm;
408 pmd->info.value_type.size = sizeof(__le64);
409 pmd->info.value_type.inc = data_block_inc;
410 pmd->info.value_type.dec = data_block_dec;
411 pmd->info.value_type.equal = data_block_equal;
412
413 memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info));
414 pmd->nb_info.tm = pmd->nb_tm;
415
416 pmd->tl_info.tm = pmd->tm;
417 pmd->tl_info.levels = 1;
Joe Thornbere3cbf942012-12-21 20:23:32 +0000418 pmd->tl_info.value_type.context = &pmd->bl_info;
Joe Thornber41675ae2012-07-27 15:08:08 +0100419 pmd->tl_info.value_type.size = sizeof(__le64);
420 pmd->tl_info.value_type.inc = subtree_inc;
421 pmd->tl_info.value_type.dec = subtree_dec;
422 pmd->tl_info.value_type.equal = subtree_equal;
423
424 pmd->bl_info.tm = pmd->tm;
425 pmd->bl_info.levels = 1;
426 pmd->bl_info.value_type.context = pmd->data_sm;
427 pmd->bl_info.value_type.size = sizeof(__le64);
428 pmd->bl_info.value_type.inc = data_block_inc;
429 pmd->bl_info.value_type.dec = data_block_dec;
430 pmd->bl_info.value_type.equal = data_block_equal;
431
432 pmd->details_info.tm = pmd->tm;
433 pmd->details_info.levels = 1;
434 pmd->details_info.value_type.context = NULL;
435 pmd->details_info.value_type.size = sizeof(struct disk_device_details);
436 pmd->details_info.value_type.inc = NULL;
437 pmd->details_info.value_type.dec = NULL;
438 pmd->details_info.value_type.equal = NULL;
439}
440
Joe Thornber5a320832014-03-27 14:13:23 +0000441static int save_sm_roots(struct dm_pool_metadata *pmd)
442{
443 int r;
444 size_t len;
445
446 r = dm_sm_root_size(pmd->metadata_sm, &len);
447 if (r < 0)
448 return r;
449
450 r = dm_sm_copy_root(pmd->metadata_sm, &pmd->metadata_space_map_root, len);
451 if (r < 0)
452 return r;
453
454 r = dm_sm_root_size(pmd->data_sm, &len);
455 if (r < 0)
456 return r;
457
458 return dm_sm_copy_root(pmd->data_sm, &pmd->data_space_map_root, len);
459}
460
461static void copy_sm_roots(struct dm_pool_metadata *pmd,
462 struct thin_disk_superblock *disk)
463{
464 memcpy(&disk->metadata_space_map_root,
465 &pmd->metadata_space_map_root,
466 sizeof(pmd->metadata_space_map_root));
467
468 memcpy(&disk->data_space_map_root,
469 &pmd->data_space_map_root,
470 sizeof(pmd->data_space_map_root));
471}
472
Joe Thornber9cb66532012-07-27 15:08:10 +0100473static int __write_initial_superblock(struct dm_pool_metadata *pmd)
474{
475 int r;
476 struct dm_block *sblock;
477 struct thin_disk_superblock *disk_super;
478 sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT;
479
480 if (bdev_size > THIN_METADATA_MAX_SECTORS)
481 bdev_size = THIN_METADATA_MAX_SECTORS;
482
Joe Thornber10d2a9f2012-07-27 15:08:11 +0100483 r = dm_sm_commit(pmd->data_sm);
484 if (r < 0)
485 return r;
486
Joe Thornber5a320832014-03-27 14:13:23 +0000487 r = save_sm_roots(pmd);
488 if (r < 0)
489 return r;
490
Joe Thornber10d2a9f2012-07-27 15:08:11 +0100491 r = dm_tm_pre_commit(pmd->tm);
492 if (r < 0)
493 return r;
494
Joe Thornber9cb66532012-07-27 15:08:10 +0100495 r = superblock_lock_zero(pmd, &sblock);
496 if (r)
497 return r;
498
499 disk_super = dm_block_data(sblock);
Joe Thornber10d2a9f2012-07-27 15:08:11 +0100500 disk_super->flags = 0;
Joe Thornber583ceee2012-07-27 15:08:11 +0100501 memset(disk_super->uuid, 0, sizeof(disk_super->uuid));
Joe Thornber9cb66532012-07-27 15:08:10 +0100502 disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC);
503 disk_super->version = cpu_to_le32(THIN_VERSION);
504 disk_super->time = 0;
Joe Thornber10d2a9f2012-07-27 15:08:11 +0100505 disk_super->trans_id = 0;
506 disk_super->held_root = 0;
507
Joe Thornber5a320832014-03-27 14:13:23 +0000508 copy_sm_roots(pmd, disk_super);
Joe Thornber10d2a9f2012-07-27 15:08:11 +0100509
510 disk_super->data_mapping_root = cpu_to_le64(pmd->root);
511 disk_super->device_details_root = cpu_to_le64(pmd->details_root);
Mike Snitzer7d489352014-02-12 23:58:15 -0500512 disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE);
Joe Thornber9cb66532012-07-27 15:08:10 +0100513 disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT);
514 disk_super->data_block_size = cpu_to_le32(pmd->data_block_size);
515
Joe Thornber270938b2012-07-27 15:08:11 +0100516 return dm_tm_commit(pmd->tm, sblock);
Joe Thornber9cb66532012-07-27 15:08:10 +0100517}
518
Joe Thornbera97e5e62012-07-27 15:08:12 +0100519static int __format_metadata(struct dm_pool_metadata *pmd)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000520{
521 int r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000522
Joe Thornbere4d22052012-07-27 15:08:12 +0100523 r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION,
524 &pmd->tm, &pmd->metadata_sm);
525 if (r < 0) {
526 DMERR("tm_create_with_sm failed");
527 return r;
528 }
Joe Thornber991d9fa2011-10-31 20:21:18 +0000529
Joe Thornbera97e5e62012-07-27 15:08:12 +0100530 pmd->data_sm = dm_sm_disk_create(pmd->tm, 0);
Joe Thornbere4d22052012-07-27 15:08:12 +0100531 if (IS_ERR(pmd->data_sm)) {
532 DMERR("sm_disk_create failed");
533 r = PTR_ERR(pmd->data_sm);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100534 goto bad_cleanup_tm;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000535 }
536
Joe Thornberd6332812012-07-27 15:08:12 +0100537 pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000538 if (!pmd->nb_tm) {
Joe Thornber0fa5b172012-07-27 15:08:14 +0100539 DMERR("could not create non-blocking clone tm");
Joe Thornber991d9fa2011-10-31 20:21:18 +0000540 r = -ENOMEM;
Joe Thornber0fa5b172012-07-27 15:08:14 +0100541 goto bad_cleanup_data_sm;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000542 }
543
Joe Thornber41675ae2012-07-27 15:08:08 +0100544 __setup_btree_details(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000545
Joe Thornber9cb66532012-07-27 15:08:10 +0100546 r = dm_btree_empty(&pmd->info, &pmd->root);
547 if (r < 0)
Joe Thornber0fa5b172012-07-27 15:08:14 +0100548 goto bad_cleanup_nb_tm;
Joe Thornber9cb66532012-07-27 15:08:10 +0100549
550 r = dm_btree_empty(&pmd->details_info, &pmd->details_root);
551 if (r < 0) {
552 DMERR("couldn't create devices root");
Joe Thornber0fa5b172012-07-27 15:08:14 +0100553 goto bad_cleanup_nb_tm;
Joe Thornber9cb66532012-07-27 15:08:10 +0100554 }
555
556 r = __write_initial_superblock(pmd);
557 if (r)
Joe Thornber0fa5b172012-07-27 15:08:14 +0100558 goto bad_cleanup_nb_tm;
Joe Thornber9cb66532012-07-27 15:08:10 +0100559
Joe Thornber991d9fa2011-10-31 20:21:18 +0000560 return 0;
561
Joe Thornber0fa5b172012-07-27 15:08:14 +0100562bad_cleanup_nb_tm:
563 dm_tm_destroy(pmd->nb_tm);
564bad_cleanup_data_sm:
Joe Thornberd6332812012-07-27 15:08:12 +0100565 dm_sm_destroy(pmd->data_sm);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100566bad_cleanup_tm:
Joe Thornberd6332812012-07-27 15:08:12 +0100567 dm_tm_destroy(pmd->tm);
568 dm_sm_destroy(pmd->metadata_sm);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000569
570 return r;
571}
572
Mike Snitzerd73ec522012-07-27 15:08:13 +0100573static int __check_incompat_features(struct thin_disk_superblock *disk_super,
574 struct dm_pool_metadata *pmd)
575{
576 uint32_t features;
577
578 features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP;
579 if (features) {
580 DMERR("could not access metadata due to unsupported optional features (%lx).",
581 (unsigned long)features);
582 return -EINVAL;
583 }
584
585 /*
586 * Check for read-only metadata to skip the following RDWR checks.
587 */
588 if (get_disk_ro(pmd->bdev->bd_disk))
589 return 0;
590
591 features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP;
592 if (features) {
593 DMERR("could not access metadata RDWR due to unsupported optional features (%lx).",
594 (unsigned long)features);
595 return -EINVAL;
596 }
597
598 return 0;
599}
600
Joe Thornbere4d22052012-07-27 15:08:12 +0100601static int __open_metadata(struct dm_pool_metadata *pmd)
602{
603 int r;
604 struct dm_block *sblock;
605 struct thin_disk_superblock *disk_super;
606
607 r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
608 &sb_validator, &sblock);
609 if (r < 0) {
610 DMERR("couldn't read superblock");
611 return r;
612 }
613
614 disk_super = dm_block_data(sblock);
Mike Snitzerd73ec522012-07-27 15:08:13 +0100615
616 r = __check_incompat_features(disk_super, pmd);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100617 if (r < 0)
618 goto bad_unlock_sblock;
Mike Snitzerd73ec522012-07-27 15:08:13 +0100619
Joe Thornbere4d22052012-07-27 15:08:12 +0100620 r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION,
621 disk_super->metadata_space_map_root,
622 sizeof(disk_super->metadata_space_map_root),
623 &pmd->tm, &pmd->metadata_sm);
624 if (r < 0) {
625 DMERR("tm_open_with_sm failed");
Joe Thornber0fa5b172012-07-27 15:08:14 +0100626 goto bad_unlock_sblock;
Joe Thornbere4d22052012-07-27 15:08:12 +0100627 }
628
629 pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root,
630 sizeof(disk_super->data_space_map_root));
631 if (IS_ERR(pmd->data_sm)) {
632 DMERR("sm_disk_open failed");
Joe Thornbere4d22052012-07-27 15:08:12 +0100633 r = PTR_ERR(pmd->data_sm);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100634 goto bad_cleanup_tm;
Joe Thornbere4d22052012-07-27 15:08:12 +0100635 }
636
Joe Thornbere4d22052012-07-27 15:08:12 +0100637 pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm);
638 if (!pmd->nb_tm) {
Joe Thornber0fa5b172012-07-27 15:08:14 +0100639 DMERR("could not create non-blocking clone tm");
Joe Thornbere4d22052012-07-27 15:08:12 +0100640 r = -ENOMEM;
Joe Thornber0fa5b172012-07-27 15:08:14 +0100641 goto bad_cleanup_data_sm;
Joe Thornbere4d22052012-07-27 15:08:12 +0100642 }
643
644 __setup_btree_details(pmd);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100645 return dm_bm_unlock(sblock);
Joe Thornbere4d22052012-07-27 15:08:12 +0100646
Joe Thornber0fa5b172012-07-27 15:08:14 +0100647bad_cleanup_data_sm:
Joe Thornbere4d22052012-07-27 15:08:12 +0100648 dm_sm_destroy(pmd->data_sm);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100649bad_cleanup_tm:
Joe Thornbere4d22052012-07-27 15:08:12 +0100650 dm_tm_destroy(pmd->tm);
651 dm_sm_destroy(pmd->metadata_sm);
Joe Thornber0fa5b172012-07-27 15:08:14 +0100652bad_unlock_sblock:
653 dm_bm_unlock(sblock);
Joe Thornbere4d22052012-07-27 15:08:12 +0100654
655 return r;
656}
657
Joe Thornber66b1edc2012-07-27 15:08:14 +0100658static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device)
Joe Thornbere4d22052012-07-27 15:08:12 +0100659{
Joe Thornber8801e062012-07-27 15:08:13 +0100660 int r, unformatted;
Joe Thornber237074c2012-07-27 15:08:13 +0100661
Joe Thornber8801e062012-07-27 15:08:13 +0100662 r = __superblock_all_zeroes(pmd->bm, &unformatted);
Joe Thornber237074c2012-07-27 15:08:13 +0100663 if (r)
664 return r;
665
Joe Thornber8801e062012-07-27 15:08:13 +0100666 if (unformatted)
Joe Thornber66b1edc2012-07-27 15:08:14 +0100667 return format_device ? __format_metadata(pmd) : -EPERM;
668
669 return __open_metadata(pmd);
Joe Thornbere4d22052012-07-27 15:08:12 +0100670}
671
Joe Thornber66b1edc2012-07-27 15:08:14 +0100672static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device)
Joe Thornber332627d2012-07-27 15:08:10 +0100673{
674 int r;
675
Mike Snitzer7d489352014-02-12 23:58:15 -0500676 pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT,
Joe Thornber332627d2012-07-27 15:08:10 +0100677 THIN_METADATA_CACHE_SIZE,
678 THIN_MAX_CONCURRENT_LOCKS);
679 if (IS_ERR(pmd->bm)) {
680 DMERR("could not create block manager");
681 return PTR_ERR(pmd->bm);
682 }
683
Joe Thornber66b1edc2012-07-27 15:08:14 +0100684 r = __open_or_format_metadata(pmd, format_device);
Joe Thornber332627d2012-07-27 15:08:10 +0100685 if (r)
686 dm_block_manager_destroy(pmd->bm);
687
688 return r;
689}
690
Joe Thornberf9dd9352012-07-27 15:08:10 +0100691static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd)
692{
693 dm_sm_destroy(pmd->data_sm);
694 dm_sm_destroy(pmd->metadata_sm);
695 dm_tm_destroy(pmd->nb_tm);
696 dm_tm_destroy(pmd->tm);
697 dm_block_manager_destroy(pmd->bm);
698}
699
Joe Thornber991d9fa2011-10-31 20:21:18 +0000700static int __begin_transaction(struct dm_pool_metadata *pmd)
701{
702 int r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000703 struct thin_disk_superblock *disk_super;
704 struct dm_block *sblock;
705
706 /*
Joe Thornber991d9fa2011-10-31 20:21:18 +0000707 * We re-read the superblock every time. Shouldn't need to do this
708 * really.
709 */
710 r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
711 &sb_validator, &sblock);
712 if (r)
713 return r;
714
715 disk_super = dm_block_data(sblock);
716 pmd->time = le32_to_cpu(disk_super->time);
717 pmd->root = le64_to_cpu(disk_super->data_mapping_root);
718 pmd->details_root = le64_to_cpu(disk_super->device_details_root);
719 pmd->trans_id = le64_to_cpu(disk_super->trans_id);
720 pmd->flags = le32_to_cpu(disk_super->flags);
721 pmd->data_block_size = le32_to_cpu(disk_super->data_block_size);
722
Joe Thornber991d9fa2011-10-31 20:21:18 +0000723 dm_bm_unlock(sblock);
Mike Snitzerd73ec522012-07-27 15:08:13 +0100724 return 0;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000725}
726
727static int __write_changed_details(struct dm_pool_metadata *pmd)
728{
729 int r;
730 struct dm_thin_device *td, *tmp;
731 struct disk_device_details details;
732 uint64_t key;
733
734 list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) {
735 if (!td->changed)
736 continue;
737
738 key = td->id;
739
740 details.mapped_blocks = cpu_to_le64(td->mapped_blocks);
741 details.transaction_id = cpu_to_le64(td->transaction_id);
742 details.creation_time = cpu_to_le32(td->creation_time);
743 details.snapshotted_time = cpu_to_le32(td->snapshotted_time);
744 __dm_bless_for_disk(&details);
745
746 r = dm_btree_insert(&pmd->details_info, pmd->details_root,
747 &key, &details, &pmd->details_root);
748 if (r)
749 return r;
750
751 if (td->open_count)
752 td->changed = 0;
753 else {
754 list_del(&td->list);
755 kfree(td);
756 }
Joe Thornber991d9fa2011-10-31 20:21:18 +0000757 }
758
759 return 0;
760}
761
762static int __commit_transaction(struct dm_pool_metadata *pmd)
763{
Joe Thornber991d9fa2011-10-31 20:21:18 +0000764 int r;
765 size_t metadata_len, data_len;
766 struct thin_disk_superblock *disk_super;
767 struct dm_block *sblock;
768
769 /*
770 * We need to know if the thin_disk_superblock exceeds a 512-byte sector.
771 */
772 BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512);
773
774 r = __write_changed_details(pmd);
775 if (r < 0)
Joe Thornberd973ac12012-07-27 15:07:58 +0100776 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000777
Joe Thornber991d9fa2011-10-31 20:21:18 +0000778 r = dm_sm_commit(pmd->data_sm);
779 if (r < 0)
Joe Thornberd973ac12012-07-27 15:07:58 +0100780 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000781
782 r = dm_tm_pre_commit(pmd->tm);
783 if (r < 0)
Joe Thornberd973ac12012-07-27 15:07:58 +0100784 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000785
786 r = dm_sm_root_size(pmd->metadata_sm, &metadata_len);
787 if (r < 0)
Joe Thornberd973ac12012-07-27 15:07:58 +0100788 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000789
Joe Thornberfef838c2012-03-28 18:41:25 +0100790 r = dm_sm_root_size(pmd->data_sm, &data_len);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000791 if (r < 0)
Joe Thornberd973ac12012-07-27 15:07:58 +0100792 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000793
Joe Thornber5a320832014-03-27 14:13:23 +0000794 r = save_sm_roots(pmd);
795 if (r < 0)
796 return r;
797
Joe Thornber25971192012-07-27 15:08:09 +0100798 r = superblock_lock(pmd, &sblock);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000799 if (r)
Joe Thornberd973ac12012-07-27 15:07:58 +0100800 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000801
802 disk_super = dm_block_data(sblock);
803 disk_super->time = cpu_to_le32(pmd->time);
804 disk_super->data_mapping_root = cpu_to_le64(pmd->root);
805 disk_super->device_details_root = cpu_to_le64(pmd->details_root);
806 disk_super->trans_id = cpu_to_le64(pmd->trans_id);
807 disk_super->flags = cpu_to_le32(pmd->flags);
808
Joe Thornber5a320832014-03-27 14:13:23 +0000809 copy_sm_roots(pmd, disk_super);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000810
Joe Thornbereb04cf62012-07-27 15:08:08 +0100811 return dm_tm_commit(pmd->tm, sblock);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000812}
813
814struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
Joe Thornber66b1edc2012-07-27 15:08:14 +0100815 sector_t data_block_size,
816 bool format_device)
Joe Thornber991d9fa2011-10-31 20:21:18 +0000817{
818 int r;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000819 struct dm_pool_metadata *pmd;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000820
821 pmd = kmalloc(sizeof(*pmd), GFP_KERNEL);
822 if (!pmd) {
823 DMERR("could not allocate metadata struct");
824 return ERR_PTR(-ENOMEM);
825 }
826
Joe Thornber6a0ebd32012-07-27 15:08:10 +0100827 init_rwsem(&pmd->root_lock);
828 pmd->time = 0;
829 INIT_LIST_HEAD(&pmd->thin_devices);
Joe Thornber12ba58a2012-07-27 15:08:15 +0100830 pmd->read_only = false;
Joe Thornberda105ed2012-07-27 15:08:15 +0100831 pmd->fail_io = false;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000832 pmd->bdev = bdev;
Joe Thornber9cb66532012-07-27 15:08:10 +0100833 pmd->data_block_size = data_block_size;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000834
Joe Thornber66b1edc2012-07-27 15:08:14 +0100835 r = __create_persistent_data_objects(pmd, format_device);
Joe Thornber332627d2012-07-27 15:08:10 +0100836 if (r) {
837 kfree(pmd);
838 return ERR_PTR(r);
839 }
840
Joe Thornber270938b2012-07-27 15:08:11 +0100841 r = __begin_transaction(pmd);
842 if (r < 0) {
843 if (dm_pool_metadata_close(pmd) < 0)
844 DMWARN("%s: dm_pool_metadata_close() failed.", __func__);
845 return ERR_PTR(r);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000846 }
847
848 return pmd;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000849}
850
851int dm_pool_metadata_close(struct dm_pool_metadata *pmd)
852{
853 int r;
854 unsigned open_devices = 0;
855 struct dm_thin_device *td, *tmp;
856
857 down_read(&pmd->root_lock);
858 list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) {
859 if (td->open_count)
860 open_devices++;
861 else {
862 list_del(&td->list);
863 kfree(td);
864 }
865 }
866 up_read(&pmd->root_lock);
867
868 if (open_devices) {
869 DMERR("attempt to close pmd when %u device(s) are still open",
870 open_devices);
871 return -EBUSY;
872 }
873
Joe Thornberda105ed2012-07-27 15:08:15 +0100874 if (!pmd->read_only && !pmd->fail_io) {
Joe Thornber12ba58a2012-07-27 15:08:15 +0100875 r = __commit_transaction(pmd);
876 if (r < 0)
877 DMWARN("%s: __commit_transaction() failed, error = %d",
878 __func__, r);
879 }
Joe Thornber991d9fa2011-10-31 20:21:18 +0000880
Joe Thornberda105ed2012-07-27 15:08:15 +0100881 if (!pmd->fail_io)
882 __destroy_persistent_data_objects(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000883
Joe Thornberda105ed2012-07-27 15:08:15 +0100884 kfree(pmd);
Joe Thornber991d9fa2011-10-31 20:21:18 +0000885 return 0;
886}
887
Mike Snitzer1f3db252012-03-07 19:09:41 +0000888/*
889 * __open_device: Returns @td corresponding to device with id @dev,
890 * creating it if @create is set and incrementing @td->open_count.
891 * On failure, @td is undefined.
892 */
Joe Thornber991d9fa2011-10-31 20:21:18 +0000893static int __open_device(struct dm_pool_metadata *pmd,
894 dm_thin_id dev, int create,
895 struct dm_thin_device **td)
896{
897 int r, changed = 0;
898 struct dm_thin_device *td2;
899 uint64_t key = dev;
900 struct disk_device_details details_le;
901
902 /*
Mike Snitzer1f3db252012-03-07 19:09:41 +0000903 * If the device is already open, return it.
Joe Thornber991d9fa2011-10-31 20:21:18 +0000904 */
905 list_for_each_entry(td2, &pmd->thin_devices, list)
906 if (td2->id == dev) {
Mike Snitzer1f3db252012-03-07 19:09:41 +0000907 /*
908 * May not create an already-open device.
909 */
910 if (create)
911 return -EEXIST;
912
Joe Thornber991d9fa2011-10-31 20:21:18 +0000913 td2->open_count++;
914 *td = td2;
915 return 0;
916 }
917
918 /*
919 * Check the device exists.
920 */
921 r = dm_btree_lookup(&pmd->details_info, pmd->details_root,
922 &key, &details_le);
923 if (r) {
924 if (r != -ENODATA || !create)
925 return r;
926
Mike Snitzer1f3db252012-03-07 19:09:41 +0000927 /*
928 * Create new device.
929 */
Joe Thornber991d9fa2011-10-31 20:21:18 +0000930 changed = 1;
931 details_le.mapped_blocks = 0;
932 details_le.transaction_id = cpu_to_le64(pmd->trans_id);
933 details_le.creation_time = cpu_to_le32(pmd->time);
934 details_le.snapshotted_time = cpu_to_le32(pmd->time);
935 }
936
937 *td = kmalloc(sizeof(**td), GFP_NOIO);
938 if (!*td)
939 return -ENOMEM;
940
941 (*td)->pmd = pmd;
942 (*td)->id = dev;
943 (*td)->open_count = 1;
944 (*td)->changed = changed;
Joe Thornberda105ed2012-07-27 15:08:15 +0100945 (*td)->aborted_with_changes = false;
Joe Thornber991d9fa2011-10-31 20:21:18 +0000946 (*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks);
947 (*td)->transaction_id = le64_to_cpu(details_le.transaction_id);
948 (*td)->creation_time = le32_to_cpu(details_le.creation_time);
949 (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time);
950
951 list_add(&(*td)->list, &pmd->thin_devices);
952
953 return 0;
954}
955
956static void __close_device(struct dm_thin_device *td)
957{
958 --td->open_count;
959}
960
961static int __create_thin(struct dm_pool_metadata *pmd,
962 dm_thin_id dev)
963{
964 int r;
965 dm_block_t dev_root;
966 uint64_t key = dev;
967 struct disk_device_details details_le;
968 struct dm_thin_device *td;
969 __le64 value;
970
971 r = dm_btree_lookup(&pmd->details_info, pmd->details_root,
972 &key, &details_le);
973 if (!r)
974 return -EEXIST;
975
976 /*
977 * Create an empty btree for the mappings.
978 */
979 r = dm_btree_empty(&pmd->bl_info, &dev_root);
980 if (r)
981 return r;
982
983 /*
984 * Insert it into the main mapping tree.
985 */
986 value = cpu_to_le64(dev_root);
987 __dm_bless_for_disk(&value);
988 r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root);
989 if (r) {
990 dm_btree_del(&pmd->bl_info, dev_root);
991 return r;
992 }
993
994 r = __open_device(pmd, dev, 1, &td);
995 if (r) {
Joe Thornber991d9fa2011-10-31 20:21:18 +0000996 dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
997 dm_btree_del(&pmd->bl_info, dev_root);
998 return r;
999 }
Joe Thornber991d9fa2011-10-31 20:21:18 +00001000 __close_device(td);
1001
1002 return r;
1003}
1004
1005int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev)
1006{
Joe Thornberda105ed2012-07-27 15:08:15 +01001007 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001008
1009 down_write(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001010 if (!pmd->fail_io)
1011 r = __create_thin(pmd, dev);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001012 up_write(&pmd->root_lock);
1013
1014 return r;
1015}
1016
1017static int __set_snapshot_details(struct dm_pool_metadata *pmd,
1018 struct dm_thin_device *snap,
1019 dm_thin_id origin, uint32_t time)
1020{
1021 int r;
1022 struct dm_thin_device *td;
1023
1024 r = __open_device(pmd, origin, 0, &td);
1025 if (r)
1026 return r;
1027
1028 td->changed = 1;
1029 td->snapshotted_time = time;
1030
1031 snap->mapped_blocks = td->mapped_blocks;
1032 snap->snapshotted_time = time;
1033 __close_device(td);
1034
1035 return 0;
1036}
1037
1038static int __create_snap(struct dm_pool_metadata *pmd,
1039 dm_thin_id dev, dm_thin_id origin)
1040{
1041 int r;
1042 dm_block_t origin_root;
1043 uint64_t key = origin, dev_key = dev;
1044 struct dm_thin_device *td;
1045 struct disk_device_details details_le;
1046 __le64 value;
1047
1048 /* check this device is unused */
1049 r = dm_btree_lookup(&pmd->details_info, pmd->details_root,
1050 &dev_key, &details_le);
1051 if (!r)
1052 return -EEXIST;
1053
1054 /* find the mapping tree for the origin */
1055 r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value);
1056 if (r)
1057 return r;
1058 origin_root = le64_to_cpu(value);
1059
1060 /* clone the origin, an inc will do */
1061 dm_tm_inc(pmd->tm, origin_root);
1062
1063 /* insert into the main mapping tree */
1064 value = cpu_to_le64(origin_root);
1065 __dm_bless_for_disk(&value);
1066 key = dev;
1067 r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root);
1068 if (r) {
1069 dm_tm_dec(pmd->tm, origin_root);
1070 return r;
1071 }
1072
1073 pmd->time++;
1074
1075 r = __open_device(pmd, dev, 1, &td);
1076 if (r)
1077 goto bad;
1078
1079 r = __set_snapshot_details(pmd, td, origin, pmd->time);
Mike Snitzer1f3db252012-03-07 19:09:41 +00001080 __close_device(td);
1081
Joe Thornber991d9fa2011-10-31 20:21:18 +00001082 if (r)
1083 goto bad;
1084
Joe Thornber991d9fa2011-10-31 20:21:18 +00001085 return 0;
1086
1087bad:
Joe Thornber991d9fa2011-10-31 20:21:18 +00001088 dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
1089 dm_btree_remove(&pmd->details_info, pmd->details_root,
1090 &key, &pmd->details_root);
1091 return r;
1092}
1093
1094int dm_pool_create_snap(struct dm_pool_metadata *pmd,
1095 dm_thin_id dev,
1096 dm_thin_id origin)
1097{
Joe Thornberda105ed2012-07-27 15:08:15 +01001098 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001099
1100 down_write(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001101 if (!pmd->fail_io)
1102 r = __create_snap(pmd, dev, origin);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001103 up_write(&pmd->root_lock);
1104
1105 return r;
1106}
1107
1108static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev)
1109{
1110 int r;
1111 uint64_t key = dev;
1112 struct dm_thin_device *td;
1113
1114 /* TODO: failure should mark the transaction invalid */
1115 r = __open_device(pmd, dev, 0, &td);
1116 if (r)
1117 return r;
1118
1119 if (td->open_count > 1) {
1120 __close_device(td);
1121 return -EBUSY;
1122 }
1123
1124 list_del(&td->list);
1125 kfree(td);
1126 r = dm_btree_remove(&pmd->details_info, pmd->details_root,
1127 &key, &pmd->details_root);
1128 if (r)
1129 return r;
1130
1131 r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
1132 if (r)
1133 return r;
1134
Joe Thornber991d9fa2011-10-31 20:21:18 +00001135 return 0;
1136}
1137
1138int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd,
1139 dm_thin_id dev)
1140{
Joe Thornberda105ed2012-07-27 15:08:15 +01001141 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001142
1143 down_write(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001144 if (!pmd->fail_io)
1145 r = __delete_device(pmd, dev);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001146 up_write(&pmd->root_lock);
1147
1148 return r;
1149}
1150
1151int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd,
1152 uint64_t current_id,
1153 uint64_t new_id)
1154{
Joe Thornberda105ed2012-07-27 15:08:15 +01001155 int r = -EINVAL;
1156
Joe Thornber991d9fa2011-10-31 20:21:18 +00001157 down_write(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001158
1159 if (pmd->fail_io)
1160 goto out;
1161
Joe Thornber991d9fa2011-10-31 20:21:18 +00001162 if (pmd->trans_id != current_id) {
Joe Thornber991d9fa2011-10-31 20:21:18 +00001163 DMERR("mismatched transaction id");
Joe Thornberda105ed2012-07-27 15:08:15 +01001164 goto out;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001165 }
1166
1167 pmd->trans_id = new_id;
Joe Thornberda105ed2012-07-27 15:08:15 +01001168 r = 0;
1169
1170out:
Joe Thornber991d9fa2011-10-31 20:21:18 +00001171 up_write(&pmd->root_lock);
1172
Joe Thornberda105ed2012-07-27 15:08:15 +01001173 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001174}
1175
1176int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd,
1177 uint64_t *result)
1178{
Joe Thornberda105ed2012-07-27 15:08:15 +01001179 int r = -EINVAL;
1180
Joe Thornber991d9fa2011-10-31 20:21:18 +00001181 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001182 if (!pmd->fail_io) {
1183 *result = pmd->trans_id;
1184 r = 0;
1185 }
Joe Thornber991d9fa2011-10-31 20:21:18 +00001186 up_read(&pmd->root_lock);
1187
Joe Thornberda105ed2012-07-27 15:08:15 +01001188 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001189}
1190
Joe Thornbercc8394d2012-06-03 00:30:01 +01001191static int __reserve_metadata_snap(struct dm_pool_metadata *pmd)
1192{
1193 int r, inc;
1194 struct thin_disk_superblock *disk_super;
1195 struct dm_block *copy, *sblock;
1196 dm_block_t held_root;
1197
1198 /*
1199 * Copy the superblock.
1200 */
1201 dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION);
1202 r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION,
1203 &sb_validator, &copy, &inc);
1204 if (r)
1205 return r;
1206
1207 BUG_ON(!inc);
1208
1209 held_root = dm_block_location(copy);
1210 disk_super = dm_block_data(copy);
1211
1212 if (le64_to_cpu(disk_super->held_root)) {
1213 DMWARN("Pool metadata snapshot already exists: release this before taking another.");
1214
1215 dm_tm_dec(pmd->tm, held_root);
1216 dm_tm_unlock(pmd->tm, copy);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001217 return -EBUSY;
1218 }
1219
1220 /*
1221 * Wipe the spacemap since we're not publishing this.
1222 */
1223 memset(&disk_super->data_space_map_root, 0,
1224 sizeof(disk_super->data_space_map_root));
1225 memset(&disk_super->metadata_space_map_root, 0,
1226 sizeof(disk_super->metadata_space_map_root));
1227
1228 /*
1229 * Increment the data structures that need to be preserved.
1230 */
1231 dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root));
1232 dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root));
1233 dm_tm_unlock(pmd->tm, copy);
1234
1235 /*
1236 * Write the held root into the superblock.
1237 */
Joe Thornber25971192012-07-27 15:08:09 +01001238 r = superblock_lock(pmd, &sblock);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001239 if (r) {
1240 dm_tm_dec(pmd->tm, held_root);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001241 return r;
1242 }
1243
1244 disk_super = dm_block_data(sblock);
1245 disk_super->held_root = cpu_to_le64(held_root);
1246 dm_bm_unlock(sblock);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001247 return 0;
1248}
1249
1250int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd)
1251{
Joe Thornberda105ed2012-07-27 15:08:15 +01001252 int r = -EINVAL;
Joe Thornbercc8394d2012-06-03 00:30:01 +01001253
1254 down_write(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001255 if (!pmd->fail_io)
1256 r = __reserve_metadata_snap(pmd);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001257 up_write(&pmd->root_lock);
1258
1259 return r;
1260}
1261
1262static int __release_metadata_snap(struct dm_pool_metadata *pmd)
1263{
1264 int r;
1265 struct thin_disk_superblock *disk_super;
1266 struct dm_block *sblock, *copy;
1267 dm_block_t held_root;
1268
Joe Thornber25971192012-07-27 15:08:09 +01001269 r = superblock_lock(pmd, &sblock);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001270 if (r)
1271 return r;
1272
1273 disk_super = dm_block_data(sblock);
1274 held_root = le64_to_cpu(disk_super->held_root);
1275 disk_super->held_root = cpu_to_le64(0);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001276
1277 dm_bm_unlock(sblock);
1278
1279 if (!held_root) {
1280 DMWARN("No pool metadata snapshot found: nothing to release.");
1281 return -EINVAL;
1282 }
1283
1284 r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, &copy);
1285 if (r)
1286 return r;
1287
1288 disk_super = dm_block_data(copy);
1289 dm_sm_dec_block(pmd->metadata_sm, le64_to_cpu(disk_super->data_mapping_root));
1290 dm_sm_dec_block(pmd->metadata_sm, le64_to_cpu(disk_super->device_details_root));
1291 dm_sm_dec_block(pmd->metadata_sm, held_root);
1292
1293 return dm_tm_unlock(pmd->tm, copy);
1294}
1295
1296int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd)
1297{
Joe Thornberda105ed2012-07-27 15:08:15 +01001298 int r = -EINVAL;
Joe Thornbercc8394d2012-06-03 00:30:01 +01001299
1300 down_write(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001301 if (!pmd->fail_io)
1302 r = __release_metadata_snap(pmd);
Joe Thornbercc8394d2012-06-03 00:30:01 +01001303 up_write(&pmd->root_lock);
1304
1305 return r;
1306}
1307
1308static int __get_metadata_snap(struct dm_pool_metadata *pmd,
1309 dm_block_t *result)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001310{
1311 int r;
1312 struct thin_disk_superblock *disk_super;
1313 struct dm_block *sblock;
1314
Joe Thornbercc8394d2012-06-03 00:30:01 +01001315 r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
1316 &sb_validator, &sblock);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001317 if (r)
1318 return r;
1319
1320 disk_super = dm_block_data(sblock);
1321 *result = le64_to_cpu(disk_super->held_root);
1322
1323 return dm_bm_unlock(sblock);
1324}
1325
Joe Thornbercc8394d2012-06-03 00:30:01 +01001326int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd,
1327 dm_block_t *result)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001328{
Joe Thornberda105ed2012-07-27 15:08:15 +01001329 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001330
1331 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001332 if (!pmd->fail_io)
1333 r = __get_metadata_snap(pmd, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001334 up_read(&pmd->root_lock);
1335
1336 return r;
1337}
1338
1339int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev,
1340 struct dm_thin_device **td)
1341{
Joe Thornberda105ed2012-07-27 15:08:15 +01001342 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001343
1344 down_write(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001345 if (!pmd->fail_io)
1346 r = __open_device(pmd, dev, 0, td);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001347 up_write(&pmd->root_lock);
1348
1349 return r;
1350}
1351
1352int dm_pool_close_thin_device(struct dm_thin_device *td)
1353{
1354 down_write(&td->pmd->root_lock);
1355 __close_device(td);
1356 up_write(&td->pmd->root_lock);
1357
1358 return 0;
1359}
1360
1361dm_thin_id dm_thin_dev_id(struct dm_thin_device *td)
1362{
1363 return td->id;
1364}
1365
Joe Thornber19fa1a62013-12-17 12:09:40 -05001366/*
1367 * Check whether @time (of block creation) is older than @td's last snapshot.
1368 * If so then the associated block is shared with the last snapshot device.
1369 * Any block on a device created *after* the device last got snapshotted is
1370 * necessarily not shared.
1371 */
Mike Snitzer17b7d632012-07-27 15:07:57 +01001372static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001373{
1374 return td->snapshotted_time > time;
1375}
1376
1377int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block,
1378 int can_block, struct dm_thin_lookup_result *result)
1379{
Joe Thornberda105ed2012-07-27 15:08:15 +01001380 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001381 uint64_t block_time = 0;
1382 __le64 value;
1383 struct dm_pool_metadata *pmd = td->pmd;
1384 dm_block_t keys[2] = { td->id, block };
Joe Thornberda105ed2012-07-27 15:08:15 +01001385 struct dm_btree_info *info;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001386
1387 if (can_block) {
1388 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001389 info = &pmd->info;
1390 } else if (down_read_trylock(&pmd->root_lock))
1391 info = &pmd->nb_info;
1392 else
Joe Thornber991d9fa2011-10-31 20:21:18 +00001393 return -EWOULDBLOCK;
1394
Joe Thornberda105ed2012-07-27 15:08:15 +01001395 if (pmd->fail_io)
1396 goto out;
1397
1398 r = dm_btree_lookup(info, pmd->root, keys, &value);
1399 if (!r)
1400 block_time = le64_to_cpu(value);
1401
1402out:
1403 up_read(&pmd->root_lock);
1404
Joe Thornber991d9fa2011-10-31 20:21:18 +00001405 if (!r) {
1406 dm_block_t exception_block;
1407 uint32_t exception_time;
1408 unpack_block_time(block_time, &exception_block,
1409 &exception_time);
1410 result->block = exception_block;
1411 result->shared = __snapshotted_since(td, exception_time);
1412 }
1413
1414 return r;
1415}
1416
1417static int __insert(struct dm_thin_device *td, dm_block_t block,
1418 dm_block_t data_block)
1419{
1420 int r, inserted;
1421 __le64 value;
1422 struct dm_pool_metadata *pmd = td->pmd;
1423 dm_block_t keys[2] = { td->id, block };
1424
Joe Thornber991d9fa2011-10-31 20:21:18 +00001425 value = cpu_to_le64(pack_block_time(data_block, pmd->time));
1426 __dm_bless_for_disk(&value);
1427
1428 r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value,
1429 &pmd->root, &inserted);
1430 if (r)
1431 return r;
1432
Joe Thornber40db5a52012-07-27 15:08:14 +01001433 td->changed = 1;
1434 if (inserted)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001435 td->mapped_blocks++;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001436
1437 return 0;
1438}
1439
1440int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block,
1441 dm_block_t data_block)
1442{
Joe Thornberda105ed2012-07-27 15:08:15 +01001443 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001444
1445 down_write(&td->pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001446 if (!td->pmd->fail_io)
1447 r = __insert(td, block, data_block);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001448 up_write(&td->pmd->root_lock);
1449
1450 return r;
1451}
1452
1453static int __remove(struct dm_thin_device *td, dm_block_t block)
1454{
1455 int r;
1456 struct dm_pool_metadata *pmd = td->pmd;
1457 dm_block_t keys[2] = { td->id, block };
1458
1459 r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root);
1460 if (r)
1461 return r;
1462
Joe Thornberaf63bcb2012-03-07 19:09:44 +00001463 td->mapped_blocks--;
1464 td->changed = 1;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001465
1466 return 0;
1467}
1468
1469int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block)
1470{
Joe Thornberda105ed2012-07-27 15:08:15 +01001471 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001472
1473 down_write(&td->pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001474 if (!td->pmd->fail_io)
1475 r = __remove(td, block);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001476 up_write(&td->pmd->root_lock);
1477
1478 return r;
1479}
1480
Joe Thornber19fa1a62013-12-17 12:09:40 -05001481int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result)
1482{
1483 int r;
1484 uint32_t ref_count;
1485
1486 down_read(&pmd->root_lock);
1487 r = dm_sm_get_count(pmd->data_sm, b, &ref_count);
1488 if (!r)
1489 *result = (ref_count != 0);
1490 up_read(&pmd->root_lock);
1491
1492 return r;
1493}
1494
Joe Thornber40db5a52012-07-27 15:08:14 +01001495bool dm_thin_changed_this_transaction(struct dm_thin_device *td)
1496{
1497 int r;
1498
1499 down_read(&td->pmd->root_lock);
1500 r = td->changed;
1501 up_read(&td->pmd->root_lock);
1502
1503 return r;
1504}
1505
Mike Snitzer4d1662a2014-02-06 06:08:56 -05001506bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd)
1507{
1508 bool r = false;
1509 struct dm_thin_device *td, *tmp;
1510
1511 down_read(&pmd->root_lock);
1512 list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) {
1513 if (td->changed) {
1514 r = td->changed;
1515 break;
1516 }
1517 }
1518 up_read(&pmd->root_lock);
1519
1520 return r;
1521}
1522
Joe Thornberda105ed2012-07-27 15:08:15 +01001523bool dm_thin_aborted_changes(struct dm_thin_device *td)
1524{
1525 bool r;
1526
1527 down_read(&td->pmd->root_lock);
1528 r = td->aborted_with_changes;
1529 up_read(&td->pmd->root_lock);
1530
1531 return r;
1532}
1533
Joe Thornber991d9fa2011-10-31 20:21:18 +00001534int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result)
1535{
Joe Thornberda105ed2012-07-27 15:08:15 +01001536 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001537
1538 down_write(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001539 if (!pmd->fail_io)
1540 r = dm_sm_new_block(pmd->data_sm, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001541 up_write(&pmd->root_lock);
1542
1543 return r;
1544}
1545
1546int dm_pool_commit_metadata(struct dm_pool_metadata *pmd)
1547{
Joe Thornberda105ed2012-07-27 15:08:15 +01001548 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001549
1550 down_write(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001551 if (pmd->fail_io)
1552 goto out;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001553
1554 r = __commit_transaction(pmd);
1555 if (r <= 0)
1556 goto out;
1557
1558 /*
1559 * Open the next transaction.
1560 */
1561 r = __begin_transaction(pmd);
1562out:
1563 up_write(&pmd->root_lock);
1564 return r;
1565}
1566
Joe Thornberda105ed2012-07-27 15:08:15 +01001567static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd)
1568{
1569 struct dm_thin_device *td;
1570
1571 list_for_each_entry(td, &pmd->thin_devices, list)
1572 td->aborted_with_changes = td->changed;
1573}
1574
1575int dm_pool_abort_metadata(struct dm_pool_metadata *pmd)
1576{
1577 int r = -EINVAL;
1578
1579 down_write(&pmd->root_lock);
1580 if (pmd->fail_io)
1581 goto out;
1582
1583 __set_abort_with_changes_flags(pmd);
1584 __destroy_persistent_data_objects(pmd);
1585 r = __create_persistent_data_objects(pmd, false);
1586 if (r)
1587 pmd->fail_io = true;
1588
1589out:
1590 up_write(&pmd->root_lock);
1591
1592 return r;
1593}
1594
Joe Thornber991d9fa2011-10-31 20:21:18 +00001595int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result)
1596{
Joe Thornberda105ed2012-07-27 15:08:15 +01001597 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001598
1599 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001600 if (!pmd->fail_io)
1601 r = dm_sm_get_nr_free(pmd->data_sm, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001602 up_read(&pmd->root_lock);
1603
1604 return r;
1605}
1606
1607int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd,
1608 dm_block_t *result)
1609{
Joe Thornberda105ed2012-07-27 15:08:15 +01001610 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001611
1612 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001613 if (!pmd->fail_io)
1614 r = dm_sm_get_nr_free(pmd->metadata_sm, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001615 up_read(&pmd->root_lock);
1616
1617 return r;
1618}
1619
1620int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd,
1621 dm_block_t *result)
1622{
Joe Thornberda105ed2012-07-27 15:08:15 +01001623 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001624
1625 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001626 if (!pmd->fail_io)
1627 r = dm_sm_get_nr_blocks(pmd->metadata_sm, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001628 up_read(&pmd->root_lock);
1629
1630 return r;
1631}
1632
1633int dm_pool_get_data_block_size(struct dm_pool_metadata *pmd, sector_t *result)
1634{
1635 down_read(&pmd->root_lock);
1636 *result = pmd->data_block_size;
1637 up_read(&pmd->root_lock);
1638
1639 return 0;
1640}
1641
1642int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result)
1643{
Joe Thornberda105ed2012-07-27 15:08:15 +01001644 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001645
1646 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001647 if (!pmd->fail_io)
1648 r = dm_sm_get_nr_blocks(pmd->data_sm, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001649 up_read(&pmd->root_lock);
1650
1651 return r;
1652}
1653
1654int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result)
1655{
Joe Thornberda105ed2012-07-27 15:08:15 +01001656 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001657 struct dm_pool_metadata *pmd = td->pmd;
1658
1659 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001660 if (!pmd->fail_io) {
1661 *result = td->mapped_blocks;
1662 r = 0;
1663 }
Joe Thornber991d9fa2011-10-31 20:21:18 +00001664 up_read(&pmd->root_lock);
1665
Joe Thornberda105ed2012-07-27 15:08:15 +01001666 return r;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001667}
1668
1669static int __highest_block(struct dm_thin_device *td, dm_block_t *result)
1670{
1671 int r;
1672 __le64 value_le;
1673 dm_block_t thin_root;
1674 struct dm_pool_metadata *pmd = td->pmd;
1675
1676 r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le);
1677 if (r)
1678 return r;
1679
1680 thin_root = le64_to_cpu(value_le);
1681
1682 return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result);
1683}
1684
1685int dm_thin_get_highest_mapped_block(struct dm_thin_device *td,
1686 dm_block_t *result)
1687{
Joe Thornberda105ed2012-07-27 15:08:15 +01001688 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001689 struct dm_pool_metadata *pmd = td->pmd;
1690
1691 down_read(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001692 if (!pmd->fail_io)
1693 r = __highest_block(td, result);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001694 up_read(&pmd->root_lock);
1695
1696 return r;
1697}
1698
Joe Thornberb17446d2013-05-10 14:37:18 +01001699static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count)
Joe Thornber991d9fa2011-10-31 20:21:18 +00001700{
1701 int r;
1702 dm_block_t old_count;
1703
Joe Thornberb17446d2013-05-10 14:37:18 +01001704 r = dm_sm_get_nr_blocks(sm, &old_count);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001705 if (r)
1706 return r;
1707
1708 if (new_count == old_count)
1709 return 0;
1710
1711 if (new_count < old_count) {
Joe Thornberb17446d2013-05-10 14:37:18 +01001712 DMERR("cannot reduce size of space map");
Joe Thornber991d9fa2011-10-31 20:21:18 +00001713 return -EINVAL;
1714 }
1715
Joe Thornberb17446d2013-05-10 14:37:18 +01001716 return dm_sm_extend(sm, new_count - old_count);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001717}
1718
1719int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count)
1720{
Joe Thornberda105ed2012-07-27 15:08:15 +01001721 int r = -EINVAL;
Joe Thornber991d9fa2011-10-31 20:21:18 +00001722
1723 down_write(&pmd->root_lock);
Joe Thornberda105ed2012-07-27 15:08:15 +01001724 if (!pmd->fail_io)
Joe Thornberb17446d2013-05-10 14:37:18 +01001725 r = __resize_space_map(pmd->data_sm, new_count);
Joe Thornber991d9fa2011-10-31 20:21:18 +00001726 up_write(&pmd->root_lock);
1727
1728 return r;
1729}
Joe Thornber12ba58a2012-07-27 15:08:15 +01001730
Joe Thornber24347e92013-05-10 14:37:19 +01001731int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count)
1732{
1733 int r = -EINVAL;
1734
1735 down_write(&pmd->root_lock);
1736 if (!pmd->fail_io)
1737 r = __resize_space_map(pmd->metadata_sm, new_count);
1738 up_write(&pmd->root_lock);
1739
1740 return r;
1741}
1742
Joe Thornber12ba58a2012-07-27 15:08:15 +01001743void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd)
1744{
1745 down_write(&pmd->root_lock);
1746 pmd->read_only = true;
1747 dm_bm_set_read_only(pmd->bm);
1748 up_write(&pmd->root_lock);
1749}
Joe Thornberac8c3f32013-05-10 14:37:21 +01001750
Joe Thornber9b7aaa62013-12-04 16:58:19 -05001751void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd)
1752{
1753 down_write(&pmd->root_lock);
1754 pmd->read_only = false;
1755 dm_bm_set_read_write(pmd->bm);
1756 up_write(&pmd->root_lock);
1757}
1758
Joe Thornberac8c3f32013-05-10 14:37:21 +01001759int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
1760 dm_block_t threshold,
1761 dm_sm_threshold_fn fn,
1762 void *context)
1763{
1764 int r;
1765
1766 down_write(&pmd->root_lock);
1767 r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context);
1768 up_write(&pmd->root_lock);
1769
1770 return r;
1771}
Mike Snitzer07f2b6e2014-02-14 11:58:41 -05001772
1773int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd)
1774{
1775 int r;
1776 struct dm_block *sblock;
1777 struct thin_disk_superblock *disk_super;
1778
1779 down_write(&pmd->root_lock);
1780 pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG;
1781
1782 r = superblock_lock(pmd, &sblock);
1783 if (r) {
1784 DMERR("couldn't read superblock");
1785 goto out;
1786 }
1787
1788 disk_super = dm_block_data(sblock);
1789 disk_super->flags = cpu_to_le32(pmd->flags);
1790
1791 dm_bm_unlock(sblock);
1792out:
1793 up_write(&pmd->root_lock);
1794 return r;
1795}
1796
1797bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd)
1798{
1799 bool needs_check;
1800
1801 down_read(&pmd->root_lock);
1802 needs_check = pmd->flags & THIN_METADATA_NEEDS_CHECK_FLAG;
1803 up_read(&pmd->root_lock);
1804
1805 return needs_check;
1806}