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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2007 Oracle. All rights reserved.
4 */
5
6#include <linux/fs.h>
7#include <linux/blkdev.h>
8#include <linux/radix-tree.h>
9#include <linux/writeback.h>
10#include <linux/buffer_head.h>
11#include <linux/workqueue.h>
12#include <linux/kthread.h>
13#include <linux/slab.h>
14#include <linux/migrate.h>
15#include <linux/ratelimit.h>
16#include <linux/uuid.h>
17#include <linux/semaphore.h>
18#include <linux/error-injection.h>
19#include <linux/crc32c.h>
20#include <linux/sched/mm.h>
21#include <asm/unaligned.h>
22#include <crypto/hash.h>
23#include "ctree.h"
24#include "disk-io.h"
25#include "transaction.h"
26#include "btrfs_inode.h"
27#include "volumes.h"
28#include "print-tree.h"
29#include "locking.h"
30#include "tree-log.h"
31#include "free-space-cache.h"
32#include "free-space-tree.h"
33#include "inode-map.h"
34#include "check-integrity.h"
35#include "rcu-string.h"
36#include "dev-replace.h"
37#include "raid56.h"
38#include "sysfs.h"
39#include "qgroup.h"
40#include "compression.h"
41#include "tree-checker.h"
42#include "ref-verify.h"
43#include "block-group.h"
44
45#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
46 BTRFS_HEADER_FLAG_RELOC |\
47 BTRFS_SUPER_FLAG_ERROR |\
48 BTRFS_SUPER_FLAG_SEEDING |\
49 BTRFS_SUPER_FLAG_METADUMP |\
50 BTRFS_SUPER_FLAG_METADUMP_V2)
51
52static const struct extent_io_ops btree_extent_io_ops;
53static void end_workqueue_fn(struct btrfs_work *work);
54static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
55static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
56 struct btrfs_fs_info *fs_info);
57static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
58static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
59 struct extent_io_tree *dirty_pages,
60 int mark);
61static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
62 struct extent_io_tree *pinned_extents);
63static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info);
64static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info);
65
66/*
67 * btrfs_end_io_wq structs are used to do processing in task context when an IO
68 * is complete. This is used during reads to verify checksums, and it is used
69 * by writes to insert metadata for new file extents after IO is complete.
70 */
71struct btrfs_end_io_wq {
72 struct bio *bio;
73 bio_end_io_t *end_io;
74 void *private;
75 struct btrfs_fs_info *info;
76 blk_status_t status;
77 enum btrfs_wq_endio_type metadata;
78 struct btrfs_work work;
79};
80
81static struct kmem_cache *btrfs_end_io_wq_cache;
82
83int __init btrfs_end_io_wq_init(void)
84{
85 btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq",
86 sizeof(struct btrfs_end_io_wq),
87 0,
88 SLAB_MEM_SPREAD,
89 NULL);
90 if (!btrfs_end_io_wq_cache)
91 return -ENOMEM;
92 return 0;
93}
94
95void __cold btrfs_end_io_wq_exit(void)
96{
97 kmem_cache_destroy(btrfs_end_io_wq_cache);
98}
99
100/*
101 * async submit bios are used to offload expensive checksumming
102 * onto the worker threads. They checksum file and metadata bios
103 * just before they are sent down the IO stack.
104 */
105struct async_submit_bio {
106 void *private_data;
107 struct bio *bio;
108 extent_submit_bio_start_t *submit_bio_start;
109 int mirror_num;
110 /*
111 * bio_offset is optional, can be used if the pages in the bio
112 * can't tell us where in the file the bio should go
113 */
114 u64 bio_offset;
115 struct btrfs_work work;
116 blk_status_t status;
117};
118
119/*
120 * Lockdep class keys for extent_buffer->lock's in this root. For a given
121 * eb, the lockdep key is determined by the btrfs_root it belongs to and
122 * the level the eb occupies in the tree.
123 *
124 * Different roots are used for different purposes and may nest inside each
125 * other and they require separate keysets. As lockdep keys should be
126 * static, assign keysets according to the purpose of the root as indicated
127 * by btrfs_root->root_key.objectid. This ensures that all special purpose
128 * roots have separate keysets.
129 *
130 * Lock-nesting across peer nodes is always done with the immediate parent
131 * node locked thus preventing deadlock. As lockdep doesn't know this, use
132 * subclass to avoid triggering lockdep warning in such cases.
133 *
134 * The key is set by the readpage_end_io_hook after the buffer has passed
135 * csum validation but before the pages are unlocked. It is also set by
136 * btrfs_init_new_buffer on freshly allocated blocks.
137 *
138 * We also add a check to make sure the highest level of the tree is the
139 * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code
140 * needs update as well.
141 */
142#ifdef CONFIG_DEBUG_LOCK_ALLOC
143# if BTRFS_MAX_LEVEL != 8
144# error
145# endif
146
147static struct btrfs_lockdep_keyset {
148 u64 id; /* root objectid */
149 const char *name_stem; /* lock name stem */
150 char names[BTRFS_MAX_LEVEL + 1][20];
151 struct lock_class_key keys[BTRFS_MAX_LEVEL + 1];
152} btrfs_lockdep_keysets[] = {
153 { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" },
154 { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" },
155 { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" },
156 { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" },
157 { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" },
158 { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" },
159 { .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" },
160 { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" },
161 { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" },
162 { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" },
163 { .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" },
164 { .id = BTRFS_FREE_SPACE_TREE_OBJECTID, .name_stem = "free-space" },
165 { .id = 0, .name_stem = "tree" },
166};
167
168void __init btrfs_init_lockdep(void)
169{
170 int i, j;
171
172 /* initialize lockdep class names */
173 for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) {
174 struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i];
175
176 for (j = 0; j < ARRAY_SIZE(ks->names); j++)
177 snprintf(ks->names[j], sizeof(ks->names[j]),
178 "btrfs-%s-%02d", ks->name_stem, j);
179 }
180}
181
182void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
183 int level)
184{
185 struct btrfs_lockdep_keyset *ks;
186
187 BUG_ON(level >= ARRAY_SIZE(ks->keys));
188
189 /* find the matching keyset, id 0 is the default entry */
190 for (ks = btrfs_lockdep_keysets; ks->id; ks++)
191 if (ks->id == objectid)
192 break;
193
194 lockdep_set_class_and_name(&eb->lock,
195 &ks->keys[level], ks->names[level]);
196}
197
198#endif
199
200/*
201 * extents on the btree inode are pretty simple, there's one extent
202 * that covers the entire device
203 */
204struct extent_map *btree_get_extent(struct btrfs_inode *inode,
205 struct page *page, size_t pg_offset, u64 start, u64 len,
206 int create)
207{
208 struct btrfs_fs_info *fs_info = inode->root->fs_info;
209 struct extent_map_tree *em_tree = &inode->extent_tree;
210 struct extent_map *em;
211 int ret;
212
213 read_lock(&em_tree->lock);
214 em = lookup_extent_mapping(em_tree, start, len);
215 if (em) {
216 em->bdev = fs_info->fs_devices->latest_bdev;
217 read_unlock(&em_tree->lock);
218 goto out;
219 }
220 read_unlock(&em_tree->lock);
221
222 em = alloc_extent_map();
223 if (!em) {
224 em = ERR_PTR(-ENOMEM);
225 goto out;
226 }
227 em->start = 0;
228 em->len = (u64)-1;
229 em->block_len = (u64)-1;
230 em->block_start = 0;
231 em->bdev = fs_info->fs_devices->latest_bdev;
232
233 write_lock(&em_tree->lock);
234 ret = add_extent_mapping(em_tree, em, 0);
235 if (ret == -EEXIST) {
236 free_extent_map(em);
237 em = lookup_extent_mapping(em_tree, start, len);
238 if (!em)
239 em = ERR_PTR(-EIO);
240 } else if (ret) {
241 free_extent_map(em);
242 em = ERR_PTR(ret);
243 }
244 write_unlock(&em_tree->lock);
245
246out:
247 return em;
248}
249
250/*
251 * Compute the csum of a btree block and store the result to provided buffer.
252 *
253 * Returns error if the extent buffer cannot be mapped.
254 */
255static int csum_tree_block(struct extent_buffer *buf, u8 *result)
256{
257 struct btrfs_fs_info *fs_info = buf->fs_info;
258 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
259 unsigned long len;
260 unsigned long cur_len;
261 unsigned long offset = BTRFS_CSUM_SIZE;
262 char *kaddr;
263 unsigned long map_start;
264 unsigned long map_len;
265 int err;
266
267 shash->tfm = fs_info->csum_shash;
268 crypto_shash_init(shash);
269
270 len = buf->len - offset;
271
272 while (len > 0) {
273 /*
274 * Note: we don't need to check for the err == 1 case here, as
275 * with the given combination of 'start = BTRFS_CSUM_SIZE (32)'
276 * and 'min_len = 32' and the currently implemented mapping
277 * algorithm we cannot cross a page boundary.
278 */
279 err = map_private_extent_buffer(buf, offset, 32,
280 &kaddr, &map_start, &map_len);
281 if (WARN_ON(err))
282 return err;
283 cur_len = min(len, map_len - (offset - map_start));
284 crypto_shash_update(shash, kaddr + offset - map_start, cur_len);
285 len -= cur_len;
286 offset += cur_len;
287 }
288 memset(result, 0, BTRFS_CSUM_SIZE);
289
290 crypto_shash_final(shash, result);
291
292 return 0;
293}
294
295/*
296 * we can't consider a given block up to date unless the transid of the
297 * block matches the transid in the parent node's pointer. This is how we
298 * detect blocks that either didn't get written at all or got written
299 * in the wrong place.
300 */
301static int verify_parent_transid(struct extent_io_tree *io_tree,
302 struct extent_buffer *eb, u64 parent_transid,
303 int atomic)
304{
305 struct extent_state *cached_state = NULL;
306 int ret;
307 bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB);
308
309 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
310 return 0;
311
312 if (atomic)
313 return -EAGAIN;
314
315 if (need_lock) {
316 btrfs_tree_read_lock(eb);
317 btrfs_set_lock_blocking_read(eb);
318 }
319
320 lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
321 &cached_state);
322 if (extent_buffer_uptodate(eb) &&
323 btrfs_header_generation(eb) == parent_transid) {
324 ret = 0;
325 goto out;
326 }
327 btrfs_err_rl(eb->fs_info,
328 "parent transid verify failed on %llu wanted %llu found %llu",
329 eb->start,
330 parent_transid, btrfs_header_generation(eb));
331 ret = 1;
332
333 /*
334 * Things reading via commit roots that don't have normal protection,
335 * like send, can have a really old block in cache that may point at a
336 * block that has been freed and re-allocated. So don't clear uptodate
337 * if we find an eb that is under IO (dirty/writeback) because we could
338 * end up reading in the stale data and then writing it back out and
339 * making everybody very sad.
340 */
341 if (!extent_buffer_under_io(eb))
342 clear_extent_buffer_uptodate(eb);
343out:
344 unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
345 &cached_state);
346 if (need_lock)
347 btrfs_tree_read_unlock_blocking(eb);
348 return ret;
349}
350
351static bool btrfs_supported_super_csum(u16 csum_type)
352{
353 switch (csum_type) {
354 case BTRFS_CSUM_TYPE_CRC32:
355 return true;
356 default:
357 return false;
358 }
359}
360
361/*
362 * Return 0 if the superblock checksum type matches the checksum value of that
363 * algorithm. Pass the raw disk superblock data.
364 */
365static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
366 char *raw_disk_sb)
367{
368 struct btrfs_super_block *disk_sb =
369 (struct btrfs_super_block *)raw_disk_sb;
370 char result[BTRFS_CSUM_SIZE];
371 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
372
373 shash->tfm = fs_info->csum_shash;
374 crypto_shash_init(shash);
375
376 /*
377 * The super_block structure does not span the whole
378 * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space is
379 * filled with zeros and is included in the checksum.
380 */
381 crypto_shash_update(shash, raw_disk_sb + BTRFS_CSUM_SIZE,
382 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
383 crypto_shash_final(shash, result);
384
385 if (memcmp(disk_sb->csum, result, btrfs_super_csum_size(disk_sb)))
386 return 1;
387
388 return 0;
389}
390
391int btrfs_verify_level_key(struct extent_buffer *eb, int level,
392 struct btrfs_key *first_key, u64 parent_transid)
393{
394 struct btrfs_fs_info *fs_info = eb->fs_info;
395 int found_level;
396 struct btrfs_key found_key;
397 int ret;
398
399 found_level = btrfs_header_level(eb);
400 if (found_level != level) {
401 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
402 KERN_ERR "BTRFS: tree level check failed\n");
403 btrfs_err(fs_info,
404"tree level mismatch detected, bytenr=%llu level expected=%u has=%u",
405 eb->start, level, found_level);
406 return -EIO;
407 }
408
409 if (!first_key)
410 return 0;
411
412 /*
413 * For live tree block (new tree blocks in current transaction),
414 * we need proper lock context to avoid race, which is impossible here.
415 * So we only checks tree blocks which is read from disk, whose
416 * generation <= fs_info->last_trans_committed.
417 */
418 if (btrfs_header_generation(eb) > fs_info->last_trans_committed)
419 return 0;
420
421 /* We have @first_key, so this @eb must have at least one item */
422 if (btrfs_header_nritems(eb) == 0) {
423 btrfs_err(fs_info,
424 "invalid tree nritems, bytenr=%llu nritems=0 expect >0",
425 eb->start);
426 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
427 return -EUCLEAN;
428 }
429
430 if (found_level)
431 btrfs_node_key_to_cpu(eb, &found_key, 0);
432 else
433 btrfs_item_key_to_cpu(eb, &found_key, 0);
434 ret = btrfs_comp_cpu_keys(first_key, &found_key);
435
436 if (ret) {
437 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
438 KERN_ERR "BTRFS: tree first key check failed\n");
439 btrfs_err(fs_info,
440"tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
441 eb->start, parent_transid, first_key->objectid,
442 first_key->type, first_key->offset,
443 found_key.objectid, found_key.type,
444 found_key.offset);
445 }
446 return ret;
447}
448
449/*
450 * helper to read a given tree block, doing retries as required when
451 * the checksums don't match and we have alternate mirrors to try.
452 *
453 * @parent_transid: expected transid, skip check if 0
454 * @level: expected level, mandatory check
455 * @first_key: expected key of first slot, skip check if NULL
456 */
457static int btree_read_extent_buffer_pages(struct extent_buffer *eb,
458 u64 parent_transid, int level,
459 struct btrfs_key *first_key)
460{
461 struct btrfs_fs_info *fs_info = eb->fs_info;
462 struct extent_io_tree *io_tree;
463 int failed = 0;
464 int ret;
465 int num_copies = 0;
466 int mirror_num = 0;
467 int failed_mirror = 0;
468
469 io_tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
470 while (1) {
471 clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
472 ret = read_extent_buffer_pages(eb, WAIT_COMPLETE, mirror_num);
473 if (!ret) {
474 if (verify_parent_transid(io_tree, eb,
475 parent_transid, 0))
476 ret = -EIO;
477 else if (btrfs_verify_level_key(eb, level,
478 first_key, parent_transid))
479 ret = -EUCLEAN;
480 else
481 break;
482 }
483
484 num_copies = btrfs_num_copies(fs_info,
485 eb->start, eb->len);
486 if (num_copies == 1)
487 break;
488
489 if (!failed_mirror) {
490 failed = 1;
491 failed_mirror = eb->read_mirror;
492 }
493
494 mirror_num++;
495 if (mirror_num == failed_mirror)
496 mirror_num++;
497
498 if (mirror_num > num_copies)
499 break;
500 }
501
502 if (failed && !ret && failed_mirror)
503 btrfs_repair_eb_io_failure(eb, failed_mirror);
504
505 return ret;
506}
507
508/*
509 * checksum a dirty tree block before IO. This has extra checks to make sure
510 * we only fill in the checksum field in the first page of a multi-page block
511 */
512
513static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
514{
515 u64 start = page_offset(page);
516 u64 found_start;
517 u8 result[BTRFS_CSUM_SIZE];
518 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
519 struct extent_buffer *eb;
520 int ret;
521
522 eb = (struct extent_buffer *)page->private;
523 if (page != eb->pages[0])
524 return 0;
525
526 found_start = btrfs_header_bytenr(eb);
527 /*
528 * Please do not consolidate these warnings into a single if.
529 * It is useful to know what went wrong.
530 */
531 if (WARN_ON(found_start != start))
532 return -EUCLEAN;
533 if (WARN_ON(!PageUptodate(page)))
534 return -EUCLEAN;
535
536 ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
537 btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0);
538
539 if (csum_tree_block(eb, result))
540 return -EINVAL;
541
542 if (btrfs_header_level(eb))
543 ret = btrfs_check_node(eb);
544 else
545 ret = btrfs_check_leaf_full(eb);
546
547 if (ret < 0) {
548 btrfs_err(fs_info,
549 "block=%llu write time tree block corruption detected",
550 eb->start);
551 return ret;
552 }
553 write_extent_buffer(eb, result, 0, csum_size);
554
555 return 0;
556}
557
558static int check_tree_block_fsid(struct extent_buffer *eb)
559{
560 struct btrfs_fs_info *fs_info = eb->fs_info;
561 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
562 u8 fsid[BTRFS_FSID_SIZE];
563 int ret = 1;
564
565 read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
566 while (fs_devices) {
567 u8 *metadata_uuid;
568
569 /*
570 * Checking the incompat flag is only valid for the current
571 * fs. For seed devices it's forbidden to have their uuid
572 * changed so reading ->fsid in this case is fine
573 */
574 if (fs_devices == fs_info->fs_devices &&
575 btrfs_fs_incompat(fs_info, METADATA_UUID))
576 metadata_uuid = fs_devices->metadata_uuid;
577 else
578 metadata_uuid = fs_devices->fsid;
579
580 if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE)) {
581 ret = 0;
582 break;
583 }
584 fs_devices = fs_devices->seed;
585 }
586 return ret;
587}
588
589static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
590 u64 phy_offset, struct page *page,
591 u64 start, u64 end, int mirror)
592{
593 u64 found_start;
594 int found_level;
595 struct extent_buffer *eb;
596 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
597 struct btrfs_fs_info *fs_info = root->fs_info;
598 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
599 int ret = 0;
600 u8 result[BTRFS_CSUM_SIZE];
601 int reads_done;
602
603 if (!page->private)
604 goto out;
605
606 eb = (struct extent_buffer *)page->private;
607
608 /* the pending IO might have been the only thing that kept this buffer
609 * in memory. Make sure we have a ref for all this other checks
610 */
611 extent_buffer_get(eb);
612
613 reads_done = atomic_dec_and_test(&eb->io_pages);
614 if (!reads_done)
615 goto err;
616
617 eb->read_mirror = mirror;
618 if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
619 ret = -EIO;
620 goto err;
621 }
622
623 found_start = btrfs_header_bytenr(eb);
624 if (found_start != eb->start) {
625 btrfs_err_rl(fs_info, "bad tree block start, want %llu have %llu",
626 eb->start, found_start);
627 ret = -EIO;
628 goto err;
629 }
630 if (check_tree_block_fsid(eb)) {
631 btrfs_err_rl(fs_info, "bad fsid on block %llu",
632 eb->start);
633 ret = -EIO;
634 goto err;
635 }
636 found_level = btrfs_header_level(eb);
637 if (found_level >= BTRFS_MAX_LEVEL) {
638 btrfs_err(fs_info, "bad tree block level %d on %llu",
639 (int)btrfs_header_level(eb), eb->start);
640 ret = -EIO;
641 goto err;
642 }
643
644 btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
645 eb, found_level);
646
647 ret = csum_tree_block(eb, result);
648 if (ret)
649 goto err;
650
651 if (memcmp_extent_buffer(eb, result, 0, csum_size)) {
652 u32 val;
653 u32 found = 0;
654
655 memcpy(&found, result, csum_size);
656
657 read_extent_buffer(eb, &val, 0, csum_size);
658 btrfs_warn_rl(fs_info,
659 "%s checksum verify failed on %llu wanted %x found %x level %d",
660 fs_info->sb->s_id, eb->start,
661 val, found, btrfs_header_level(eb));
662 ret = -EUCLEAN;
663 goto err;
664 }
665
666 /*
667 * If this is a leaf block and it is corrupt, set the corrupt bit so
668 * that we don't try and read the other copies of this block, just
669 * return -EIO.
670 */
671 if (found_level == 0 && btrfs_check_leaf_full(eb)) {
672 set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
673 ret = -EIO;
674 }
675
676 if (found_level > 0 && btrfs_check_node(eb))
677 ret = -EIO;
678
679 if (!ret)
680 set_extent_buffer_uptodate(eb);
681 else
682 btrfs_err(fs_info,
683 "block=%llu read time tree block corruption detected",
684 eb->start);
685err:
686 if (reads_done &&
687 test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
688 btree_readahead_hook(eb, ret);
689
690 if (ret) {
691 /*
692 * our io error hook is going to dec the io pages
693 * again, we have to make sure it has something
694 * to decrement
695 */
696 atomic_inc(&eb->io_pages);
697 clear_extent_buffer_uptodate(eb);
698 }
699 free_extent_buffer(eb);
700out:
701 return ret;
702}
703
704static void end_workqueue_bio(struct bio *bio)
705{
706 struct btrfs_end_io_wq *end_io_wq = bio->bi_private;
707 struct btrfs_fs_info *fs_info;
708 struct btrfs_workqueue *wq;
709 btrfs_work_func_t func;
710
711 fs_info = end_io_wq->info;
712 end_io_wq->status = bio->bi_status;
713
714 if (bio_op(bio) == REQ_OP_WRITE) {
715 if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) {
716 wq = fs_info->endio_meta_write_workers;
717 func = btrfs_endio_meta_write_helper;
718 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) {
719 wq = fs_info->endio_freespace_worker;
720 func = btrfs_freespace_write_helper;
721 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
722 wq = fs_info->endio_raid56_workers;
723 func = btrfs_endio_raid56_helper;
724 } else {
725 wq = fs_info->endio_write_workers;
726 func = btrfs_endio_write_helper;
727 }
728 } else {
729 if (unlikely(end_io_wq->metadata ==
730 BTRFS_WQ_ENDIO_DIO_REPAIR)) {
731 wq = fs_info->endio_repair_workers;
732 func = btrfs_endio_repair_helper;
733 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
734 wq = fs_info->endio_raid56_workers;
735 func = btrfs_endio_raid56_helper;
736 } else if (end_io_wq->metadata) {
737 wq = fs_info->endio_meta_workers;
738 func = btrfs_endio_meta_helper;
739 } else {
740 wq = fs_info->endio_workers;
741 func = btrfs_endio_helper;
742 }
743 }
744
745 btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL);
746 btrfs_queue_work(wq, &end_io_wq->work);
747}
748
749blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
750 enum btrfs_wq_endio_type metadata)
751{
752 struct btrfs_end_io_wq *end_io_wq;
753
754 end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS);
755 if (!end_io_wq)
756 return BLK_STS_RESOURCE;
757
758 end_io_wq->private = bio->bi_private;
759 end_io_wq->end_io = bio->bi_end_io;
760 end_io_wq->info = info;
761 end_io_wq->status = 0;
762 end_io_wq->bio = bio;
763 end_io_wq->metadata = metadata;
764
765 bio->bi_private = end_io_wq;
766 bio->bi_end_io = end_workqueue_bio;
767 return 0;
768}
769
770static void run_one_async_start(struct btrfs_work *work)
771{
772 struct async_submit_bio *async;
773 blk_status_t ret;
774
775 async = container_of(work, struct async_submit_bio, work);
776 ret = async->submit_bio_start(async->private_data, async->bio,
777 async->bio_offset);
778 if (ret)
779 async->status = ret;
780}
781
782/*
783 * In order to insert checksums into the metadata in large chunks, we wait
784 * until bio submission time. All the pages in the bio are checksummed and
785 * sums are attached onto the ordered extent record.
786 *
787 * At IO completion time the csums attached on the ordered extent record are
788 * inserted into the tree.
789 */
790static void run_one_async_done(struct btrfs_work *work)
791{
792 struct async_submit_bio *async;
793 struct inode *inode;
794 blk_status_t ret;
795
796 async = container_of(work, struct async_submit_bio, work);
797 inode = async->private_data;
798
799 /* If an error occurred we just want to clean up the bio and move on */
800 if (async->status) {
801 async->bio->bi_status = async->status;
802 bio_endio(async->bio);
803 return;
804 }
805
806 ret = btrfs_map_bio(btrfs_sb(inode->i_sb), async->bio,
807 async->mirror_num, 1);
808 if (ret) {
809 async->bio->bi_status = ret;
810 bio_endio(async->bio);
811 }
812}
813
814static void run_one_async_free(struct btrfs_work *work)
815{
816 struct async_submit_bio *async;
817
818 async = container_of(work, struct async_submit_bio, work);
819 kfree(async);
820}
821
822blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
823 int mirror_num, unsigned long bio_flags,
824 u64 bio_offset, void *private_data,
825 extent_submit_bio_start_t *submit_bio_start)
826{
827 struct async_submit_bio *async;
828
829 async = kmalloc(sizeof(*async), GFP_NOFS);
830 if (!async)
831 return BLK_STS_RESOURCE;
832
833 async->private_data = private_data;
834 async->bio = bio;
835 async->mirror_num = mirror_num;
836 async->submit_bio_start = submit_bio_start;
837
838 btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start,
839 run_one_async_done, run_one_async_free);
840
841 async->bio_offset = bio_offset;
842
843 async->status = 0;
844
845 if (op_is_sync(bio->bi_opf))
846 btrfs_set_work_high_priority(&async->work);
847
848 btrfs_queue_work(fs_info->workers, &async->work);
849 return 0;
850}
851
852static blk_status_t btree_csum_one_bio(struct bio *bio)
853{
854 struct bio_vec *bvec;
855 struct btrfs_root *root;
856 int ret = 0;
857 struct bvec_iter_all iter_all;
858
859 ASSERT(!bio_flagged(bio, BIO_CLONED));
860 bio_for_each_segment_all(bvec, bio, iter_all) {
861 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
862 ret = csum_dirty_buffer(root->fs_info, bvec->bv_page);
863 if (ret)
864 break;
865 }
866
867 return errno_to_blk_status(ret);
868}
869
870static blk_status_t btree_submit_bio_start(void *private_data, struct bio *bio,
871 u64 bio_offset)
872{
873 /*
874 * when we're called for a write, we're already in the async
875 * submission context. Just jump into btrfs_map_bio
876 */
877 return btree_csum_one_bio(bio);
878}
879
880static int check_async_write(struct btrfs_fs_info *fs_info,
881 struct btrfs_inode *bi)
882{
883 if (atomic_read(&bi->sync_writers))
884 return 0;
885 if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags))
886 return 0;
887 return 1;
888}
889
890static blk_status_t btree_submit_bio_hook(struct inode *inode, struct bio *bio,
891 int mirror_num,
892 unsigned long bio_flags)
893{
894 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
895 int async = check_async_write(fs_info, BTRFS_I(inode));
896 blk_status_t ret;
897
898 if (bio_op(bio) != REQ_OP_WRITE) {
899 /*
900 * called for a read, do the setup so that checksum validation
901 * can happen in the async kernel threads
902 */
903 ret = btrfs_bio_wq_end_io(fs_info, bio,
904 BTRFS_WQ_ENDIO_METADATA);
905 if (ret)
906 goto out_w_error;
907 ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
908 } else if (!async) {
909 ret = btree_csum_one_bio(bio);
910 if (ret)
911 goto out_w_error;
912 ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
913 } else {
914 /*
915 * kthread helpers are used to submit writes so that
916 * checksumming can happen in parallel across all CPUs
917 */
918 ret = btrfs_wq_submit_bio(fs_info, bio, mirror_num, 0,
919 0, inode, btree_submit_bio_start);
920 }
921
922 if (ret)
923 goto out_w_error;
924 return 0;
925
926out_w_error:
927 bio->bi_status = ret;
928 bio_endio(bio);
929 return ret;
930}
931
932#ifdef CONFIG_MIGRATION
933static int btree_migratepage(struct address_space *mapping,
934 struct page *newpage, struct page *page,
935 enum migrate_mode mode)
936{
937 /*
938 * we can't safely write a btree page from here,
939 * we haven't done the locking hook
940 */
941 if (PageDirty(page))
942 return -EAGAIN;
943 /*
944 * Buffers may be managed in a filesystem specific way.
945 * We must have no buffers or drop them.
946 */
947 if (page_has_private(page) &&
948 !try_to_release_page(page, GFP_KERNEL))
949 return -EAGAIN;
950 return migrate_page(mapping, newpage, page, mode);
951}
952#endif
953
954
955static int btree_writepages(struct address_space *mapping,
956 struct writeback_control *wbc)
957{
958 struct btrfs_fs_info *fs_info;
959 int ret;
960
961 if (wbc->sync_mode == WB_SYNC_NONE) {
962
963 if (wbc->for_kupdate)
964 return 0;
965
966 fs_info = BTRFS_I(mapping->host)->root->fs_info;
967 /* this is a bit racy, but that's ok */
968 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
969 BTRFS_DIRTY_METADATA_THRESH,
970 fs_info->dirty_metadata_batch);
971 if (ret < 0)
972 return 0;
973 }
974 return btree_write_cache_pages(mapping, wbc);
975}
976
977static int btree_readpage(struct file *file, struct page *page)
978{
979 struct extent_io_tree *tree;
980 tree = &BTRFS_I(page->mapping->host)->io_tree;
981 return extent_read_full_page(tree, page, btree_get_extent, 0);
982}
983
984static int btree_releasepage(struct page *page, gfp_t gfp_flags)
985{
986 if (PageWriteback(page) || PageDirty(page))
987 return 0;
988
989 return try_release_extent_buffer(page);
990}
991
992static void btree_invalidatepage(struct page *page, unsigned int offset,
993 unsigned int length)
994{
995 struct extent_io_tree *tree;
996 tree = &BTRFS_I(page->mapping->host)->io_tree;
997 extent_invalidatepage(tree, page, offset);
998 btree_releasepage(page, GFP_NOFS);
999 if (PagePrivate(page)) {
1000 btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info,
1001 "page private not zero on page %llu",
1002 (unsigned long long)page_offset(page));
1003 ClearPagePrivate(page);
1004 set_page_private(page, 0);
1005 put_page(page);
1006 }
1007}
1008
1009static int btree_set_page_dirty(struct page *page)
1010{
1011#ifdef DEBUG
1012 struct extent_buffer *eb;
1013
1014 BUG_ON(!PagePrivate(page));
1015 eb = (struct extent_buffer *)page->private;
1016 BUG_ON(!eb);
1017 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
1018 BUG_ON(!atomic_read(&eb->refs));
1019 btrfs_assert_tree_locked(eb);
1020#endif
1021 return __set_page_dirty_nobuffers(page);
1022}
1023
1024static const struct address_space_operations btree_aops = {
1025 .readpage = btree_readpage,
1026 .writepages = btree_writepages,
1027 .releasepage = btree_releasepage,
1028 .invalidatepage = btree_invalidatepage,
1029#ifdef CONFIG_MIGRATION
1030 .migratepage = btree_migratepage,
1031#endif
1032 .set_page_dirty = btree_set_page_dirty,
1033};
1034
1035void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr)
1036{
1037 struct extent_buffer *buf = NULL;
1038 int ret;
1039
1040 buf = btrfs_find_create_tree_block(fs_info, bytenr);
1041 if (IS_ERR(buf))
1042 return;
1043
1044 ret = read_extent_buffer_pages(buf, WAIT_NONE, 0);
1045 if (ret < 0)
1046 free_extent_buffer_stale(buf);
1047 else
1048 free_extent_buffer(buf);
1049}
1050
1051struct extent_buffer *btrfs_find_create_tree_block(
1052 struct btrfs_fs_info *fs_info,
1053 u64 bytenr)
1054{
1055 if (btrfs_is_testing(fs_info))
1056 return alloc_test_extent_buffer(fs_info, bytenr);
1057 return alloc_extent_buffer(fs_info, bytenr);
1058}
1059
1060/*
1061 * Read tree block at logical address @bytenr and do variant basic but critical
1062 * verification.
1063 *
1064 * @parent_transid: expected transid of this tree block, skip check if 0
1065 * @level: expected level, mandatory check
1066 * @first_key: expected key in slot 0, skip check if NULL
1067 */
1068struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
1069 u64 parent_transid, int level,
1070 struct btrfs_key *first_key)
1071{
1072 struct extent_buffer *buf = NULL;
1073 int ret;
1074
1075 buf = btrfs_find_create_tree_block(fs_info, bytenr);
1076 if (IS_ERR(buf))
1077 return buf;
1078
1079 ret = btree_read_extent_buffer_pages(buf, parent_transid,
1080 level, first_key);
1081 if (ret) {
1082 free_extent_buffer_stale(buf);
1083 return ERR_PTR(ret);
1084 }
1085 return buf;
1086
1087}
1088
1089void btrfs_clean_tree_block(struct extent_buffer *buf)
1090{
1091 struct btrfs_fs_info *fs_info = buf->fs_info;
1092 if (btrfs_header_generation(buf) ==
1093 fs_info->running_transaction->transid) {
1094 btrfs_assert_tree_locked(buf);
1095
1096 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
1097 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
1098 -buf->len,
1099 fs_info->dirty_metadata_batch);
1100 /* ugh, clear_extent_buffer_dirty needs to lock the page */
1101 btrfs_set_lock_blocking_write(buf);
1102 clear_extent_buffer_dirty(buf);
1103 }
1104 }
1105}
1106
1107static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void)
1108{
1109 struct btrfs_subvolume_writers *writers;
1110 int ret;
1111
1112 writers = kmalloc(sizeof(*writers), GFP_NOFS);
1113 if (!writers)
1114 return ERR_PTR(-ENOMEM);
1115
1116 ret = percpu_counter_init(&writers->counter, 0, GFP_NOFS);
1117 if (ret < 0) {
1118 kfree(writers);
1119 return ERR_PTR(ret);
1120 }
1121
1122 init_waitqueue_head(&writers->wait);
1123 return writers;
1124}
1125
1126static void
1127btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers)
1128{
1129 percpu_counter_destroy(&writers->counter);
1130 kfree(writers);
1131}
1132
1133static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
1134 u64 objectid)
1135{
1136 bool dummy = test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
1137 root->node = NULL;
1138 root->commit_root = NULL;
1139 root->state = 0;
1140 root->orphan_cleanup_state = 0;
1141
1142 root->last_trans = 0;
1143 root->highest_objectid = 0;
1144 root->nr_delalloc_inodes = 0;
1145 root->nr_ordered_extents = 0;
1146 root->inode_tree = RB_ROOT;
1147 INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
1148 root->block_rsv = NULL;
1149
1150 INIT_LIST_HEAD(&root->dirty_list);
1151 INIT_LIST_HEAD(&root->root_list);
1152 INIT_LIST_HEAD(&root->delalloc_inodes);
1153 INIT_LIST_HEAD(&root->delalloc_root);
1154 INIT_LIST_HEAD(&root->ordered_extents);
1155 INIT_LIST_HEAD(&root->ordered_root);
1156 INIT_LIST_HEAD(&root->reloc_dirty_list);
1157 INIT_LIST_HEAD(&root->logged_list[0]);
1158 INIT_LIST_HEAD(&root->logged_list[1]);
1159 spin_lock_init(&root->inode_lock);
1160 spin_lock_init(&root->delalloc_lock);
1161 spin_lock_init(&root->ordered_extent_lock);
1162 spin_lock_init(&root->accounting_lock);
1163 spin_lock_init(&root->log_extents_lock[0]);
1164 spin_lock_init(&root->log_extents_lock[1]);
1165 spin_lock_init(&root->qgroup_meta_rsv_lock);
1166 mutex_init(&root->objectid_mutex);
1167 mutex_init(&root->log_mutex);
1168 mutex_init(&root->ordered_extent_mutex);
1169 mutex_init(&root->delalloc_mutex);
1170 init_waitqueue_head(&root->log_writer_wait);
1171 init_waitqueue_head(&root->log_commit_wait[0]);
1172 init_waitqueue_head(&root->log_commit_wait[1]);
1173 INIT_LIST_HEAD(&root->log_ctxs[0]);
1174 INIT_LIST_HEAD(&root->log_ctxs[1]);
1175 atomic_set(&root->log_commit[0], 0);
1176 atomic_set(&root->log_commit[1], 0);
1177 atomic_set(&root->log_writers, 0);
1178 atomic_set(&root->log_batch, 0);
1179 refcount_set(&root->refs, 1);
1180 atomic_set(&root->will_be_snapshotted, 0);
1181 atomic_set(&root->snapshot_force_cow, 0);
1182 atomic_set(&root->nr_swapfiles, 0);
1183 root->log_transid = 0;
1184 root->log_transid_committed = -1;
1185 root->last_log_commit = 0;
1186 if (!dummy)
1187 extent_io_tree_init(fs_info, &root->dirty_log_pages,
1188 IO_TREE_ROOT_DIRTY_LOG_PAGES, NULL);
1189
1190 memset(&root->root_key, 0, sizeof(root->root_key));
1191 memset(&root->root_item, 0, sizeof(root->root_item));
1192 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
1193 if (!dummy)
1194 root->defrag_trans_start = fs_info->generation;
1195 else
1196 root->defrag_trans_start = 0;
1197 root->root_key.objectid = objectid;
1198 root->anon_dev = 0;
1199
1200 spin_lock_init(&root->root_item_lock);
1201 btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks);
1202}
1203
1204static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
1205 gfp_t flags)
1206{
1207 struct btrfs_root *root = kzalloc(sizeof(*root), flags);
1208 if (root)
1209 root->fs_info = fs_info;
1210 return root;
1211}
1212
1213#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1214/* Should only be used by the testing infrastructure */
1215struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info)
1216{
1217 struct btrfs_root *root;
1218
1219 if (!fs_info)
1220 return ERR_PTR(-EINVAL);
1221
1222 root = btrfs_alloc_root(fs_info, GFP_KERNEL);
1223 if (!root)
1224 return ERR_PTR(-ENOMEM);
1225
1226 /* We don't use the stripesize in selftest, set it as sectorsize */
1227 __setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
1228 root->alloc_bytenr = 0;
1229
1230 return root;
1231}
1232#endif
1233
1234struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
1235 u64 objectid)
1236{
1237 struct btrfs_fs_info *fs_info = trans->fs_info;
1238 struct extent_buffer *leaf;
1239 struct btrfs_root *tree_root = fs_info->tree_root;
1240 struct btrfs_root *root;
1241 struct btrfs_key key;
1242 unsigned int nofs_flag;
1243 int ret = 0;
1244 uuid_le uuid = NULL_UUID_LE;
1245
1246 /*
1247 * We're holding a transaction handle, so use a NOFS memory allocation
1248 * context to avoid deadlock if reclaim happens.
1249 */
1250 nofs_flag = memalloc_nofs_save();
1251 root = btrfs_alloc_root(fs_info, GFP_KERNEL);
1252 memalloc_nofs_restore(nofs_flag);
1253 if (!root)
1254 return ERR_PTR(-ENOMEM);
1255
1256 __setup_root(root, fs_info, objectid);
1257 root->root_key.objectid = objectid;
1258 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1259 root->root_key.offset = 0;
1260
1261 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
1262 if (IS_ERR(leaf)) {
1263 ret = PTR_ERR(leaf);
1264 leaf = NULL;
1265 goto fail;
1266 }
1267
1268 root->node = leaf;
1269 btrfs_mark_buffer_dirty(leaf);
1270
1271 root->commit_root = btrfs_root_node(root);
1272 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
1273
1274 root->root_item.flags = 0;
1275 root->root_item.byte_limit = 0;
1276 btrfs_set_root_bytenr(&root->root_item, leaf->start);
1277 btrfs_set_root_generation(&root->root_item, trans->transid);
1278 btrfs_set_root_level(&root->root_item, 0);
1279 btrfs_set_root_refs(&root->root_item, 1);
1280 btrfs_set_root_used(&root->root_item, leaf->len);
1281 btrfs_set_root_last_snapshot(&root->root_item, 0);
1282 btrfs_set_root_dirid(&root->root_item, 0);
1283 if (is_fstree(objectid))
1284 uuid_le_gen(&uuid);
1285 memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
1286 root->root_item.drop_level = 0;
1287
1288 key.objectid = objectid;
1289 key.type = BTRFS_ROOT_ITEM_KEY;
1290 key.offset = 0;
1291 ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
1292 if (ret)
1293 goto fail;
1294
1295 btrfs_tree_unlock(leaf);
1296
1297 return root;
1298
1299fail:
1300 if (leaf) {
1301 btrfs_tree_unlock(leaf);
1302 free_extent_buffer(root->commit_root);
1303 free_extent_buffer(leaf);
1304 }
1305 kfree(root);
1306
1307 return ERR_PTR(ret);
1308}
1309
1310static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1311 struct btrfs_fs_info *fs_info)
1312{
1313 struct btrfs_root *root;
1314 struct extent_buffer *leaf;
1315
1316 root = btrfs_alloc_root(fs_info, GFP_NOFS);
1317 if (!root)
1318 return ERR_PTR(-ENOMEM);
1319
1320 __setup_root(root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1321
1322 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1323 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1324 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
1325
1326 /*
1327 * DON'T set REF_COWS for log trees
1328 *
1329 * log trees do not get reference counted because they go away
1330 * before a real commit is actually done. They do store pointers
1331 * to file data extents, and those reference counts still get
1332 * updated (along with back refs to the log tree).
1333 */
1334
1335 leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
1336 NULL, 0, 0, 0);
1337 if (IS_ERR(leaf)) {
1338 kfree(root);
1339 return ERR_CAST(leaf);
1340 }
1341
1342 root->node = leaf;
1343
1344 btrfs_mark_buffer_dirty(root->node);
1345 btrfs_tree_unlock(root->node);
1346 return root;
1347}
1348
1349int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1350 struct btrfs_fs_info *fs_info)
1351{
1352 struct btrfs_root *log_root;
1353
1354 log_root = alloc_log_tree(trans, fs_info);
1355 if (IS_ERR(log_root))
1356 return PTR_ERR(log_root);
1357 WARN_ON(fs_info->log_root_tree);
1358 fs_info->log_root_tree = log_root;
1359 return 0;
1360}
1361
1362int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1363 struct btrfs_root *root)
1364{
1365 struct btrfs_fs_info *fs_info = root->fs_info;
1366 struct btrfs_root *log_root;
1367 struct btrfs_inode_item *inode_item;
1368
1369 log_root = alloc_log_tree(trans, fs_info);
1370 if (IS_ERR(log_root))
1371 return PTR_ERR(log_root);
1372
1373 log_root->last_trans = trans->transid;
1374 log_root->root_key.offset = root->root_key.objectid;
1375
1376 inode_item = &log_root->root_item.inode;
1377 btrfs_set_stack_inode_generation(inode_item, 1);
1378 btrfs_set_stack_inode_size(inode_item, 3);
1379 btrfs_set_stack_inode_nlink(inode_item, 1);
1380 btrfs_set_stack_inode_nbytes(inode_item,
1381 fs_info->nodesize);
1382 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
1383
1384 btrfs_set_root_node(&log_root->root_item, log_root->node);
1385
1386 WARN_ON(root->log_root);
1387 root->log_root = log_root;
1388 root->log_transid = 0;
1389 root->log_transid_committed = -1;
1390 root->last_log_commit = 0;
1391 return 0;
1392}
1393
1394static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
1395 struct btrfs_key *key)
1396{
1397 struct btrfs_root *root;
1398 struct btrfs_fs_info *fs_info = tree_root->fs_info;
1399 struct btrfs_path *path;
1400 u64 generation;
1401 int ret;
1402 int level;
1403
1404 path = btrfs_alloc_path();
1405 if (!path)
1406 return ERR_PTR(-ENOMEM);
1407
1408 root = btrfs_alloc_root(fs_info, GFP_NOFS);
1409 if (!root) {
1410 ret = -ENOMEM;
1411 goto alloc_fail;
1412 }
1413
1414 __setup_root(root, fs_info, key->objectid);
1415
1416 ret = btrfs_find_root(tree_root, key, path,
1417 &root->root_item, &root->root_key);
1418 if (ret) {
1419 if (ret > 0)
1420 ret = -ENOENT;
1421 goto find_fail;
1422 }
1423
1424 generation = btrfs_root_generation(&root->root_item);
1425 level = btrfs_root_level(&root->root_item);
1426 root->node = read_tree_block(fs_info,
1427 btrfs_root_bytenr(&root->root_item),
1428 generation, level, NULL);
1429 if (IS_ERR(root->node)) {
1430 ret = PTR_ERR(root->node);
1431 goto find_fail;
1432 } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
1433 ret = -EIO;
1434 free_extent_buffer(root->node);
1435 goto find_fail;
1436 }
1437 root->commit_root = btrfs_root_node(root);
1438out:
1439 btrfs_free_path(path);
1440 return root;
1441
1442find_fail:
1443 kfree(root);
1444alloc_fail:
1445 root = ERR_PTR(ret);
1446 goto out;
1447}
1448
1449struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
1450 struct btrfs_key *location)
1451{
1452 struct btrfs_root *root;
1453
1454 root = btrfs_read_tree_root(tree_root, location);
1455 if (IS_ERR(root))
1456 return root;
1457
1458 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
1459 set_bit(BTRFS_ROOT_REF_COWS, &root->state);
1460 btrfs_check_and_init_root_item(&root->root_item);
1461 }
1462
1463 return root;
1464}
1465
1466int btrfs_init_fs_root(struct btrfs_root *root)
1467{
1468 int ret;
1469 struct btrfs_subvolume_writers *writers;
1470
1471 root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
1472 root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
1473 GFP_NOFS);
1474 if (!root->free_ino_pinned || !root->free_ino_ctl) {
1475 ret = -ENOMEM;
1476 goto fail;
1477 }
1478
1479 writers = btrfs_alloc_subvolume_writers();
1480 if (IS_ERR(writers)) {
1481 ret = PTR_ERR(writers);
1482 goto fail;
1483 }
1484 root->subv_writers = writers;
1485
1486 btrfs_init_free_ino_ctl(root);
1487 spin_lock_init(&root->ino_cache_lock);
1488 init_waitqueue_head(&root->ino_cache_wait);
1489
1490 ret = get_anon_bdev(&root->anon_dev);
1491 if (ret)
1492 goto fail;
1493
1494 mutex_lock(&root->objectid_mutex);
1495 ret = btrfs_find_highest_objectid(root,
1496 &root->highest_objectid);
1497 if (ret) {
1498 mutex_unlock(&root->objectid_mutex);
1499 goto fail;
1500 }
1501
1502 ASSERT(root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
1503
1504 mutex_unlock(&root->objectid_mutex);
1505
1506 return 0;
1507fail:
1508 /* The caller is responsible to call btrfs_free_fs_root */
1509 return ret;
1510}
1511
1512struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1513 u64 root_id)
1514{
1515 struct btrfs_root *root;
1516
1517 spin_lock(&fs_info->fs_roots_radix_lock);
1518 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1519 (unsigned long)root_id);
1520 spin_unlock(&fs_info->fs_roots_radix_lock);
1521 return root;
1522}
1523
1524int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
1525 struct btrfs_root *root)
1526{
1527 int ret;
1528
1529 ret = radix_tree_preload(GFP_NOFS);
1530 if (ret)
1531 return ret;
1532
1533 spin_lock(&fs_info->fs_roots_radix_lock);
1534 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1535 (unsigned long)root->root_key.objectid,
1536 root);
1537 if (ret == 0)
1538 set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
1539 spin_unlock(&fs_info->fs_roots_radix_lock);
1540 radix_tree_preload_end();
1541
1542 return ret;
1543}
1544
1545struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
1546 struct btrfs_key *location,
1547 bool check_ref)
1548{
1549 struct btrfs_root *root;
1550 struct btrfs_path *path;
1551 struct btrfs_key key;
1552 int ret;
1553
1554 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1555 return fs_info->tree_root;
1556 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
1557 return fs_info->extent_root;
1558 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
1559 return fs_info->chunk_root;
1560 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
1561 return fs_info->dev_root;
1562 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
1563 return fs_info->csum_root;
1564 if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
1565 return fs_info->quota_root ? fs_info->quota_root :
1566 ERR_PTR(-ENOENT);
1567 if (location->objectid == BTRFS_UUID_TREE_OBJECTID)
1568 return fs_info->uuid_root ? fs_info->uuid_root :
1569 ERR_PTR(-ENOENT);
1570 if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
1571 return fs_info->free_space_root ? fs_info->free_space_root :
1572 ERR_PTR(-ENOENT);
1573again:
1574 root = btrfs_lookup_fs_root(fs_info, location->objectid);
1575 if (root) {
1576 if (check_ref && btrfs_root_refs(&root->root_item) == 0)
1577 return ERR_PTR(-ENOENT);
1578 return root;
1579 }
1580
1581 root = btrfs_read_fs_root(fs_info->tree_root, location);
1582 if (IS_ERR(root))
1583 return root;
1584
1585 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1586 ret = -ENOENT;
1587 goto fail;
1588 }
1589
1590 ret = btrfs_init_fs_root(root);
1591 if (ret)
1592 goto fail;
1593
1594 path = btrfs_alloc_path();
1595 if (!path) {
1596 ret = -ENOMEM;
1597 goto fail;
1598 }
1599 key.objectid = BTRFS_ORPHAN_OBJECTID;
1600 key.type = BTRFS_ORPHAN_ITEM_KEY;
1601 key.offset = location->objectid;
1602
1603 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
1604 btrfs_free_path(path);
1605 if (ret < 0)
1606 goto fail;
1607 if (ret == 0)
1608 set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
1609
1610 ret = btrfs_insert_fs_root(fs_info, root);
1611 if (ret) {
1612 if (ret == -EEXIST) {
1613 btrfs_free_fs_root(root);
1614 goto again;
1615 }
1616 goto fail;
1617 }
1618 return root;
1619fail:
1620 btrfs_free_fs_root(root);
1621 return ERR_PTR(ret);
1622}
1623
1624static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1625{
1626 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
1627 int ret = 0;
1628 struct btrfs_device *device;
1629 struct backing_dev_info *bdi;
1630
1631 rcu_read_lock();
1632 list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
1633 if (!device->bdev)
1634 continue;
1635 bdi = device->bdev->bd_bdi;
1636 if (bdi_congested(bdi, bdi_bits)) {
1637 ret = 1;
1638 break;
1639 }
1640 }
1641 rcu_read_unlock();
1642 return ret;
1643}
1644
1645/*
1646 * called by the kthread helper functions to finally call the bio end_io
1647 * functions. This is where read checksum verification actually happens
1648 */
1649static void end_workqueue_fn(struct btrfs_work *work)
1650{
1651 struct bio *bio;
1652 struct btrfs_end_io_wq *end_io_wq;
1653
1654 end_io_wq = container_of(work, struct btrfs_end_io_wq, work);
1655 bio = end_io_wq->bio;
1656
1657 bio->bi_status = end_io_wq->status;
1658 bio->bi_private = end_io_wq->private;
1659 bio->bi_end_io = end_io_wq->end_io;
1660 kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq);
1661 bio_endio(bio);
1662}
1663
1664static int cleaner_kthread(void *arg)
1665{
1666 struct btrfs_root *root = arg;
1667 struct btrfs_fs_info *fs_info = root->fs_info;
1668 int again;
1669
1670 while (1) {
1671 again = 0;
1672
1673 set_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1674
1675 /* Make the cleaner go to sleep early. */
1676 if (btrfs_need_cleaner_sleep(fs_info))
1677 goto sleep;
1678
1679 /*
1680 * Do not do anything if we might cause open_ctree() to block
1681 * before we have finished mounting the filesystem.
1682 */
1683 if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
1684 goto sleep;
1685
1686 if (!mutex_trylock(&fs_info->cleaner_mutex))
1687 goto sleep;
1688
1689 /*
1690 * Avoid the problem that we change the status of the fs
1691 * during the above check and trylock.
1692 */
1693 if (btrfs_need_cleaner_sleep(fs_info)) {
1694 mutex_unlock(&fs_info->cleaner_mutex);
1695 goto sleep;
1696 }
1697
1698 btrfs_run_delayed_iputs(fs_info);
1699
1700 again = btrfs_clean_one_deleted_snapshot(root);
1701 mutex_unlock(&fs_info->cleaner_mutex);
1702
1703 /*
1704 * The defragger has dealt with the R/O remount and umount,
1705 * needn't do anything special here.
1706 */
1707 btrfs_run_defrag_inodes(fs_info);
1708
1709 /*
1710 * Acquires fs_info->delete_unused_bgs_mutex to avoid racing
1711 * with relocation (btrfs_relocate_chunk) and relocation
1712 * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
1713 * after acquiring fs_info->delete_unused_bgs_mutex. So we
1714 * can't hold, nor need to, fs_info->cleaner_mutex when deleting
1715 * unused block groups.
1716 */
1717 btrfs_delete_unused_bgs(fs_info);
1718sleep:
1719 clear_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1720 if (kthread_should_park())
1721 kthread_parkme();
1722 if (kthread_should_stop())
1723 return 0;
1724 if (!again) {
1725 set_current_state(TASK_INTERRUPTIBLE);
1726 schedule();
1727 __set_current_state(TASK_RUNNING);
1728 }
1729 }
1730}
1731
1732static int transaction_kthread(void *arg)
1733{
1734 struct btrfs_root *root = arg;
1735 struct btrfs_fs_info *fs_info = root->fs_info;
1736 struct btrfs_trans_handle *trans;
1737 struct btrfs_transaction *cur;
1738 u64 transid;
1739 time64_t now;
1740 unsigned long delay;
1741 bool cannot_commit;
1742
1743 do {
1744 cannot_commit = false;
1745 delay = HZ * fs_info->commit_interval;
1746 mutex_lock(&fs_info->transaction_kthread_mutex);
1747
1748 spin_lock(&fs_info->trans_lock);
1749 cur = fs_info->running_transaction;
1750 if (!cur) {
1751 spin_unlock(&fs_info->trans_lock);
1752 goto sleep;
1753 }
1754
1755 now = ktime_get_seconds();
1756 if (cur->state < TRANS_STATE_BLOCKED &&
1757 !test_bit(BTRFS_FS_NEED_ASYNC_COMMIT, &fs_info->flags) &&
1758 (now < cur->start_time ||
1759 now - cur->start_time < fs_info->commit_interval)) {
1760 spin_unlock(&fs_info->trans_lock);
1761 delay = HZ * 5;
1762 goto sleep;
1763 }
1764 transid = cur->transid;
1765 spin_unlock(&fs_info->trans_lock);
1766
1767 /* If the file system is aborted, this will always fail. */
1768 trans = btrfs_attach_transaction(root);
1769 if (IS_ERR(trans)) {
1770 if (PTR_ERR(trans) != -ENOENT)
1771 cannot_commit = true;
1772 goto sleep;
1773 }
1774 if (transid == trans->transid) {
1775 btrfs_commit_transaction(trans);
1776 } else {
1777 btrfs_end_transaction(trans);
1778 }
1779sleep:
1780 wake_up_process(fs_info->cleaner_kthread);
1781 mutex_unlock(&fs_info->transaction_kthread_mutex);
1782
1783 if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
1784 &fs_info->fs_state)))
1785 btrfs_cleanup_transaction(fs_info);
1786 if (!kthread_should_stop() &&
1787 (!btrfs_transaction_blocked(fs_info) ||
1788 cannot_commit))
1789 schedule_timeout_interruptible(delay);
1790 } while (!kthread_should_stop());
1791 return 0;
1792}
1793
1794/*
1795 * this will find the highest generation in the array of
1796 * root backups. The index of the highest array is returned,
1797 * or -1 if we can't find anything.
1798 *
1799 * We check to make sure the array is valid by comparing the
1800 * generation of the latest root in the array with the generation
1801 * in the super block. If they don't match we pitch it.
1802 */
1803static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen)
1804{
1805 u64 cur;
1806 int newest_index = -1;
1807 struct btrfs_root_backup *root_backup;
1808 int i;
1809
1810 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
1811 root_backup = info->super_copy->super_roots + i;
1812 cur = btrfs_backup_tree_root_gen(root_backup);
1813 if (cur == newest_gen)
1814 newest_index = i;
1815 }
1816
1817 /* check to see if we actually wrapped around */
1818 if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) {
1819 root_backup = info->super_copy->super_roots;
1820 cur = btrfs_backup_tree_root_gen(root_backup);
1821 if (cur == newest_gen)
1822 newest_index = 0;
1823 }
1824 return newest_index;
1825}
1826
1827
1828/*
1829 * find the oldest backup so we know where to store new entries
1830 * in the backup array. This will set the backup_root_index
1831 * field in the fs_info struct
1832 */
1833static void find_oldest_super_backup(struct btrfs_fs_info *info,
1834 u64 newest_gen)
1835{
1836 int newest_index = -1;
1837
1838 newest_index = find_newest_super_backup(info, newest_gen);
1839 /* if there was garbage in there, just move along */
1840 if (newest_index == -1) {
1841 info->backup_root_index = 0;
1842 } else {
1843 info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS;
1844 }
1845}
1846
1847/*
1848 * copy all the root pointers into the super backup array.
1849 * this will bump the backup pointer by one when it is
1850 * done
1851 */
1852static void backup_super_roots(struct btrfs_fs_info *info)
1853{
1854 int next_backup;
1855 struct btrfs_root_backup *root_backup;
1856 int last_backup;
1857
1858 next_backup = info->backup_root_index;
1859 last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) %
1860 BTRFS_NUM_BACKUP_ROOTS;
1861
1862 /*
1863 * just overwrite the last backup if we're at the same generation
1864 * this happens only at umount
1865 */
1866 root_backup = info->super_for_commit->super_roots + last_backup;
1867 if (btrfs_backup_tree_root_gen(root_backup) ==
1868 btrfs_header_generation(info->tree_root->node))
1869 next_backup = last_backup;
1870
1871 root_backup = info->super_for_commit->super_roots + next_backup;
1872
1873 /*
1874 * make sure all of our padding and empty slots get zero filled
1875 * regardless of which ones we use today
1876 */
1877 memset(root_backup, 0, sizeof(*root_backup));
1878
1879 info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
1880
1881 btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
1882 btrfs_set_backup_tree_root_gen(root_backup,
1883 btrfs_header_generation(info->tree_root->node));
1884
1885 btrfs_set_backup_tree_root_level(root_backup,
1886 btrfs_header_level(info->tree_root->node));
1887
1888 btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
1889 btrfs_set_backup_chunk_root_gen(root_backup,
1890 btrfs_header_generation(info->chunk_root->node));
1891 btrfs_set_backup_chunk_root_level(root_backup,
1892 btrfs_header_level(info->chunk_root->node));
1893
1894 btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start);
1895 btrfs_set_backup_extent_root_gen(root_backup,
1896 btrfs_header_generation(info->extent_root->node));
1897 btrfs_set_backup_extent_root_level(root_backup,
1898 btrfs_header_level(info->extent_root->node));
1899
1900 /*
1901 * we might commit during log recovery, which happens before we set
1902 * the fs_root. Make sure it is valid before we fill it in.
1903 */
1904 if (info->fs_root && info->fs_root->node) {
1905 btrfs_set_backup_fs_root(root_backup,
1906 info->fs_root->node->start);
1907 btrfs_set_backup_fs_root_gen(root_backup,
1908 btrfs_header_generation(info->fs_root->node));
1909 btrfs_set_backup_fs_root_level(root_backup,
1910 btrfs_header_level(info->fs_root->node));
1911 }
1912
1913 btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
1914 btrfs_set_backup_dev_root_gen(root_backup,
1915 btrfs_header_generation(info->dev_root->node));
1916 btrfs_set_backup_dev_root_level(root_backup,
1917 btrfs_header_level(info->dev_root->node));
1918
1919 btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start);
1920 btrfs_set_backup_csum_root_gen(root_backup,
1921 btrfs_header_generation(info->csum_root->node));
1922 btrfs_set_backup_csum_root_level(root_backup,
1923 btrfs_header_level(info->csum_root->node));
1924
1925 btrfs_set_backup_total_bytes(root_backup,
1926 btrfs_super_total_bytes(info->super_copy));
1927 btrfs_set_backup_bytes_used(root_backup,
1928 btrfs_super_bytes_used(info->super_copy));
1929 btrfs_set_backup_num_devices(root_backup,
1930 btrfs_super_num_devices(info->super_copy));
1931
1932 /*
1933 * if we don't copy this out to the super_copy, it won't get remembered
1934 * for the next commit
1935 */
1936 memcpy(&info->super_copy->super_roots,
1937 &info->super_for_commit->super_roots,
1938 sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
1939}
1940
1941/*
1942 * this copies info out of the root backup array and back into
1943 * the in-memory super block. It is meant to help iterate through
1944 * the array, so you send it the number of backups you've already
1945 * tried and the last backup index you used.
1946 *
1947 * this returns -1 when it has tried all the backups
1948 */
1949static noinline int next_root_backup(struct btrfs_fs_info *info,
1950 struct btrfs_super_block *super,
1951 int *num_backups_tried, int *backup_index)
1952{
1953 struct btrfs_root_backup *root_backup;
1954 int newest = *backup_index;
1955
1956 if (*num_backups_tried == 0) {
1957 u64 gen = btrfs_super_generation(super);
1958
1959 newest = find_newest_super_backup(info, gen);
1960 if (newest == -1)
1961 return -1;
1962
1963 *backup_index = newest;
1964 *num_backups_tried = 1;
1965 } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) {
1966 /* we've tried all the backups, all done */
1967 return -1;
1968 } else {
1969 /* jump to the next oldest backup */
1970 newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) %
1971 BTRFS_NUM_BACKUP_ROOTS;
1972 *backup_index = newest;
1973 *num_backups_tried += 1;
1974 }
1975 root_backup = super->super_roots + newest;
1976
1977 btrfs_set_super_generation(super,
1978 btrfs_backup_tree_root_gen(root_backup));
1979 btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
1980 btrfs_set_super_root_level(super,
1981 btrfs_backup_tree_root_level(root_backup));
1982 btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
1983
1984 /*
1985 * fixme: the total bytes and num_devices need to match or we should
1986 * need a fsck
1987 */
1988 btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
1989 btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
1990 return 0;
1991}
1992
1993/* helper to cleanup workers */
1994static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
1995{
1996 btrfs_destroy_workqueue(fs_info->fixup_workers);
1997 btrfs_destroy_workqueue(fs_info->delalloc_workers);
1998 btrfs_destroy_workqueue(fs_info->workers);
1999 btrfs_destroy_workqueue(fs_info->endio_workers);
2000 btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
2001 btrfs_destroy_workqueue(fs_info->endio_repair_workers);
2002 btrfs_destroy_workqueue(fs_info->rmw_workers);
2003 btrfs_destroy_workqueue(fs_info->endio_write_workers);
2004 btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
2005 btrfs_destroy_workqueue(fs_info->submit_workers);
2006 btrfs_destroy_workqueue(fs_info->delayed_workers);
2007 btrfs_destroy_workqueue(fs_info->caching_workers);
2008 btrfs_destroy_workqueue(fs_info->readahead_workers);
2009 btrfs_destroy_workqueue(fs_info->flush_workers);
2010 btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
2011 /*
2012 * Now that all other work queues are destroyed, we can safely destroy
2013 * the queues used for metadata I/O, since tasks from those other work
2014 * queues can do metadata I/O operations.
2015 */
2016 btrfs_destroy_workqueue(fs_info->endio_meta_workers);
2017 btrfs_destroy_workqueue(fs_info->endio_meta_write_workers);
2018}
2019
2020static void free_root_extent_buffers(struct btrfs_root *root)
2021{
2022 if (root) {
2023 free_extent_buffer(root->node);
2024 free_extent_buffer(root->commit_root);
2025 root->node = NULL;
2026 root->commit_root = NULL;
2027 }
2028}
2029
2030/* helper to cleanup tree roots */
2031static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
2032{
2033 free_root_extent_buffers(info->tree_root);
2034
2035 free_root_extent_buffers(info->dev_root);
2036 free_root_extent_buffers(info->extent_root);
2037 free_root_extent_buffers(info->csum_root);
2038 free_root_extent_buffers(info->quota_root);
2039 free_root_extent_buffers(info->uuid_root);
2040 if (chunk_root)
2041 free_root_extent_buffers(info->chunk_root);
2042 free_root_extent_buffers(info->free_space_root);
2043}
2044
2045void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
2046{
2047 int ret;
2048 struct btrfs_root *gang[8];
2049 int i;
2050
2051 while (!list_empty(&fs_info->dead_roots)) {
2052 gang[0] = list_entry(fs_info->dead_roots.next,
2053 struct btrfs_root, root_list);
2054 list_del(&gang[0]->root_list);
2055
2056 if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) {
2057 btrfs_drop_and_free_fs_root(fs_info, gang[0]);
2058 } else {
2059 free_extent_buffer(gang[0]->node);
2060 free_extent_buffer(gang[0]->commit_root);
2061 btrfs_put_fs_root(gang[0]);
2062 }
2063 }
2064
2065 while (1) {
2066 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2067 (void **)gang, 0,
2068 ARRAY_SIZE(gang));
2069 if (!ret)
2070 break;
2071 for (i = 0; i < ret; i++)
2072 btrfs_drop_and_free_fs_root(fs_info, gang[i]);
2073 }
2074
2075 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
2076 btrfs_free_log_root_tree(NULL, fs_info);
2077 btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
2078 }
2079}
2080
2081static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
2082{
2083 mutex_init(&fs_info->scrub_lock);
2084 atomic_set(&fs_info->scrubs_running, 0);
2085 atomic_set(&fs_info->scrub_pause_req, 0);
2086 atomic_set(&fs_info->scrubs_paused, 0);
2087 atomic_set(&fs_info->scrub_cancel_req, 0);
2088 init_waitqueue_head(&fs_info->scrub_pause_wait);
2089 refcount_set(&fs_info->scrub_workers_refcnt, 0);
2090}
2091
2092static void btrfs_init_balance(struct btrfs_fs_info *fs_info)
2093{
2094 spin_lock_init(&fs_info->balance_lock);
2095 mutex_init(&fs_info->balance_mutex);
2096 atomic_set(&fs_info->balance_pause_req, 0);
2097 atomic_set(&fs_info->balance_cancel_req, 0);
2098 fs_info->balance_ctl = NULL;
2099 init_waitqueue_head(&fs_info->balance_wait_q);
2100}
2101
2102static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
2103{
2104 struct inode *inode = fs_info->btree_inode;
2105
2106 inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
2107 set_nlink(inode, 1);
2108 /*
2109 * we set the i_size on the btree inode to the max possible int.
2110 * the real end of the address space is determined by all of
2111 * the devices in the system
2112 */
2113 inode->i_size = OFFSET_MAX;
2114 inode->i_mapping->a_ops = &btree_aops;
2115
2116 RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
2117 extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
2118 IO_TREE_INODE_IO, inode);
2119 BTRFS_I(inode)->io_tree.track_uptodate = false;
2120 extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
2121
2122 BTRFS_I(inode)->io_tree.ops = &btree_extent_io_ops;
2123
2124 BTRFS_I(inode)->root = fs_info->tree_root;
2125 memset(&BTRFS_I(inode)->location, 0, sizeof(struct btrfs_key));
2126 set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
2127 btrfs_insert_inode_hash(inode);
2128}
2129
2130static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
2131{
2132 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2133 init_rwsem(&fs_info->dev_replace.rwsem);
2134 init_waitqueue_head(&fs_info->dev_replace.replace_wait);
2135}
2136
2137static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)
2138{
2139 spin_lock_init(&fs_info->qgroup_lock);
2140 mutex_init(&fs_info->qgroup_ioctl_lock);
2141 fs_info->qgroup_tree = RB_ROOT;
2142 INIT_LIST_HEAD(&fs_info->dirty_qgroups);
2143 fs_info->qgroup_seq = 1;
2144 fs_info->qgroup_ulist = NULL;
2145 fs_info->qgroup_rescan_running = false;
2146 mutex_init(&fs_info->qgroup_rescan_lock);
2147}
2148
2149static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info,
2150 struct btrfs_fs_devices *fs_devices)
2151{
2152 u32 max_active = fs_info->thread_pool_size;
2153 unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
2154
2155 fs_info->workers =
2156 btrfs_alloc_workqueue(fs_info, "worker",
2157 flags | WQ_HIGHPRI, max_active, 16);
2158
2159 fs_info->delalloc_workers =
2160 btrfs_alloc_workqueue(fs_info, "delalloc",
2161 flags, max_active, 2);
2162
2163 fs_info->flush_workers =
2164 btrfs_alloc_workqueue(fs_info, "flush_delalloc",
2165 flags, max_active, 0);
2166
2167 fs_info->caching_workers =
2168 btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0);
2169
2170 /*
2171 * a higher idle thresh on the submit workers makes it much more
2172 * likely that bios will be send down in a sane order to the
2173 * devices
2174 */
2175 fs_info->submit_workers =
2176 btrfs_alloc_workqueue(fs_info, "submit", flags,
2177 min_t(u64, fs_devices->num_devices,
2178 max_active), 64);
2179
2180 fs_info->fixup_workers =
2181 btrfs_alloc_workqueue(fs_info, "fixup", flags, 1, 0);
2182
2183 /*
2184 * endios are largely parallel and should have a very
2185 * low idle thresh
2186 */
2187 fs_info->endio_workers =
2188 btrfs_alloc_workqueue(fs_info, "endio", flags, max_active, 4);
2189 fs_info->endio_meta_workers =
2190 btrfs_alloc_workqueue(fs_info, "endio-meta", flags,
2191 max_active, 4);
2192 fs_info->endio_meta_write_workers =
2193 btrfs_alloc_workqueue(fs_info, "endio-meta-write", flags,
2194 max_active, 2);
2195 fs_info->endio_raid56_workers =
2196 btrfs_alloc_workqueue(fs_info, "endio-raid56", flags,
2197 max_active, 4);
2198 fs_info->endio_repair_workers =
2199 btrfs_alloc_workqueue(fs_info, "endio-repair", flags, 1, 0);
2200 fs_info->rmw_workers =
2201 btrfs_alloc_workqueue(fs_info, "rmw", flags, max_active, 2);
2202 fs_info->endio_write_workers =
2203 btrfs_alloc_workqueue(fs_info, "endio-write", flags,
2204 max_active, 2);
2205 fs_info->endio_freespace_worker =
2206 btrfs_alloc_workqueue(fs_info, "freespace-write", flags,
2207 max_active, 0);
2208 fs_info->delayed_workers =
2209 btrfs_alloc_workqueue(fs_info, "delayed-meta", flags,
2210 max_active, 0);
2211 fs_info->readahead_workers =
2212 btrfs_alloc_workqueue(fs_info, "readahead", flags,
2213 max_active, 2);
2214 fs_info->qgroup_rescan_workers =
2215 btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0);
2216
2217 if (!(fs_info->workers && fs_info->delalloc_workers &&
2218 fs_info->submit_workers && fs_info->flush_workers &&
2219 fs_info->endio_workers && fs_info->endio_meta_workers &&
2220 fs_info->endio_meta_write_workers &&
2221 fs_info->endio_repair_workers &&
2222 fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
2223 fs_info->endio_freespace_worker && fs_info->rmw_workers &&
2224 fs_info->caching_workers && fs_info->readahead_workers &&
2225 fs_info->fixup_workers && fs_info->delayed_workers &&
2226 fs_info->qgroup_rescan_workers)) {
2227 return -ENOMEM;
2228 }
2229
2230 return 0;
2231}
2232
2233static int btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type)
2234{
2235 struct crypto_shash *csum_shash;
2236 const char *csum_name = btrfs_super_csum_name(csum_type);
2237
2238 csum_shash = crypto_alloc_shash(csum_name, 0, 0);
2239
2240 if (IS_ERR(csum_shash)) {
2241 btrfs_err(fs_info, "error allocating %s hash for checksum",
2242 csum_name);
2243 return PTR_ERR(csum_shash);
2244 }
2245
2246 fs_info->csum_shash = csum_shash;
2247
2248 return 0;
2249}
2250
2251static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
2252{
2253 crypto_free_shash(fs_info->csum_shash);
2254}
2255
2256static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
2257 struct btrfs_fs_devices *fs_devices)
2258{
2259 int ret;
2260 struct btrfs_root *log_tree_root;
2261 struct btrfs_super_block *disk_super = fs_info->super_copy;
2262 u64 bytenr = btrfs_super_log_root(disk_super);
2263 int level = btrfs_super_log_root_level(disk_super);
2264
2265 if (fs_devices->rw_devices == 0) {
2266 btrfs_warn(fs_info, "log replay required on RO media");
2267 return -EIO;
2268 }
2269
2270 log_tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
2271 if (!log_tree_root)
2272 return -ENOMEM;
2273
2274 __setup_root(log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
2275
2276 log_tree_root->node = read_tree_block(fs_info, bytenr,
2277 fs_info->generation + 1,
2278 level, NULL);
2279 if (IS_ERR(log_tree_root->node)) {
2280 btrfs_warn(fs_info, "failed to read log tree");
2281 ret = PTR_ERR(log_tree_root->node);
2282 kfree(log_tree_root);
2283 return ret;
2284 } else if (!extent_buffer_uptodate(log_tree_root->node)) {
2285 btrfs_err(fs_info, "failed to read log tree");
2286 free_extent_buffer(log_tree_root->node);
2287 kfree(log_tree_root);
2288 return -EIO;
2289 }
2290 /* returns with log_tree_root freed on success */
2291 ret = btrfs_recover_log_trees(log_tree_root);
2292 if (ret) {
2293 btrfs_handle_fs_error(fs_info, ret,
2294 "Failed to recover log tree");
2295 free_extent_buffer(log_tree_root->node);
2296 kfree(log_tree_root);
2297 return ret;
2298 }
2299
2300 if (sb_rdonly(fs_info->sb)) {
2301 ret = btrfs_commit_super(fs_info);
2302 if (ret)
2303 return ret;
2304 }
2305
2306 return 0;
2307}
2308
2309static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
2310{
2311 struct btrfs_root *tree_root = fs_info->tree_root;
2312 struct btrfs_root *root;
2313 struct btrfs_key location;
2314 int ret;
2315
2316 BUG_ON(!fs_info->tree_root);
2317
2318 location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
2319 location.type = BTRFS_ROOT_ITEM_KEY;
2320 location.offset = 0;
2321
2322 root = btrfs_read_tree_root(tree_root, &location);
2323 if (IS_ERR(root)) {
2324 ret = PTR_ERR(root);
2325 goto out;
2326 }
2327 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2328 fs_info->extent_root = root;
2329
2330 location.objectid = BTRFS_DEV_TREE_OBJECTID;
2331 root = btrfs_read_tree_root(tree_root, &location);
2332 if (IS_ERR(root)) {
2333 ret = PTR_ERR(root);
2334 goto out;
2335 }
2336 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2337 fs_info->dev_root = root;
2338 btrfs_init_devices_late(fs_info);
2339
2340 location.objectid = BTRFS_CSUM_TREE_OBJECTID;
2341 root = btrfs_read_tree_root(tree_root, &location);
2342 if (IS_ERR(root)) {
2343 ret = PTR_ERR(root);
2344 goto out;
2345 }
2346 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2347 fs_info->csum_root = root;
2348
2349 location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
2350 root = btrfs_read_tree_root(tree_root, &location);
2351 if (!IS_ERR(root)) {
2352 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2353 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
2354 fs_info->quota_root = root;
2355 }
2356
2357 location.objectid = BTRFS_UUID_TREE_OBJECTID;
2358 root = btrfs_read_tree_root(tree_root, &location);
2359 if (IS_ERR(root)) {
2360 ret = PTR_ERR(root);
2361 if (ret != -ENOENT)
2362 goto out;
2363 } else {
2364 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2365 fs_info->uuid_root = root;
2366 }
2367
2368 if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
2369 location.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID;
2370 root = btrfs_read_tree_root(tree_root, &location);
2371 if (IS_ERR(root)) {
2372 ret = PTR_ERR(root);
2373 goto out;
2374 }
2375 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2376 fs_info->free_space_root = root;
2377 }
2378
2379 return 0;
2380out:
2381 btrfs_warn(fs_info, "failed to read root (objectid=%llu): %d",
2382 location.objectid, ret);
2383 return ret;
2384}
2385
2386/*
2387 * Real super block validation
2388 * NOTE: super csum type and incompat features will not be checked here.
2389 *
2390 * @sb: super block to check
2391 * @mirror_num: the super block number to check its bytenr:
2392 * 0 the primary (1st) sb
2393 * 1, 2 2nd and 3rd backup copy
2394 * -1 skip bytenr check
2395 */
2396static int validate_super(struct btrfs_fs_info *fs_info,
2397 struct btrfs_super_block *sb, int mirror_num)
2398{
2399 u64 nodesize = btrfs_super_nodesize(sb);
2400 u64 sectorsize = btrfs_super_sectorsize(sb);
2401 int ret = 0;
2402
2403 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
2404 btrfs_err(fs_info, "no valid FS found");
2405 ret = -EINVAL;
2406 }
2407 if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP) {
2408 btrfs_err(fs_info, "unrecognized or unsupported super flag: %llu",
2409 btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
2410 ret = -EINVAL;
2411 }
2412 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
2413 btrfs_err(fs_info, "tree_root level too big: %d >= %d",
2414 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
2415 ret = -EINVAL;
2416 }
2417 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
2418 btrfs_err(fs_info, "chunk_root level too big: %d >= %d",
2419 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
2420 ret = -EINVAL;
2421 }
2422 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
2423 btrfs_err(fs_info, "log_root level too big: %d >= %d",
2424 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
2425 ret = -EINVAL;
2426 }
2427
2428 /*
2429 * Check sectorsize and nodesize first, other check will need it.
2430 * Check all possible sectorsize(4K, 8K, 16K, 32K, 64K) here.
2431 */
2432 if (!is_power_of_2(sectorsize) || sectorsize < 4096 ||
2433 sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2434 btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
2435 ret = -EINVAL;
2436 }
2437 /* Only PAGE SIZE is supported yet */
2438 if (sectorsize != PAGE_SIZE) {
2439 btrfs_err(fs_info,
2440 "sectorsize %llu not supported yet, only support %lu",
2441 sectorsize, PAGE_SIZE);
2442 ret = -EINVAL;
2443 }
2444 if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
2445 nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2446 btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
2447 ret = -EINVAL;
2448 }
2449 if (nodesize != le32_to_cpu(sb->__unused_leafsize)) {
2450 btrfs_err(fs_info, "invalid leafsize %u, should be %llu",
2451 le32_to_cpu(sb->__unused_leafsize), nodesize);
2452 ret = -EINVAL;
2453 }
2454
2455 /* Root alignment check */
2456 if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) {
2457 btrfs_warn(fs_info, "tree_root block unaligned: %llu",
2458 btrfs_super_root(sb));
2459 ret = -EINVAL;
2460 }
2461 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) {
2462 btrfs_warn(fs_info, "chunk_root block unaligned: %llu",
2463 btrfs_super_chunk_root(sb));
2464 ret = -EINVAL;
2465 }
2466 if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) {
2467 btrfs_warn(fs_info, "log_root block unaligned: %llu",
2468 btrfs_super_log_root(sb));
2469 ret = -EINVAL;
2470 }
2471
2472 if (memcmp(fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid,
2473 BTRFS_FSID_SIZE) != 0) {
2474 btrfs_err(fs_info,
2475 "dev_item UUID does not match metadata fsid: %pU != %pU",
2476 fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid);
2477 ret = -EINVAL;
2478 }
2479
2480 /*
2481 * Hint to catch really bogus numbers, bitflips or so, more exact checks are
2482 * done later
2483 */
2484 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
2485 btrfs_err(fs_info, "bytes_used is too small %llu",
2486 btrfs_super_bytes_used(sb));
2487 ret = -EINVAL;
2488 }
2489 if (!is_power_of_2(btrfs_super_stripesize(sb))) {
2490 btrfs_err(fs_info, "invalid stripesize %u",
2491 btrfs_super_stripesize(sb));
2492 ret = -EINVAL;
2493 }
2494 if (btrfs_super_num_devices(sb) > (1UL << 31))
2495 btrfs_warn(fs_info, "suspicious number of devices: %llu",
2496 btrfs_super_num_devices(sb));
2497 if (btrfs_super_num_devices(sb) == 0) {
2498 btrfs_err(fs_info, "number of devices is 0");
2499 ret = -EINVAL;
2500 }
2501
2502 if (mirror_num >= 0 &&
2503 btrfs_super_bytenr(sb) != btrfs_sb_offset(mirror_num)) {
2504 btrfs_err(fs_info, "super offset mismatch %llu != %u",
2505 btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
2506 ret = -EINVAL;
2507 }
2508
2509 /*
2510 * Obvious sys_chunk_array corruptions, it must hold at least one key
2511 * and one chunk
2512 */
2513 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
2514 btrfs_err(fs_info, "system chunk array too big %u > %u",
2515 btrfs_super_sys_array_size(sb),
2516 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
2517 ret = -EINVAL;
2518 }
2519 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
2520 + sizeof(struct btrfs_chunk)) {
2521 btrfs_err(fs_info, "system chunk array too small %u < %zu",
2522 btrfs_super_sys_array_size(sb),
2523 sizeof(struct btrfs_disk_key)
2524 + sizeof(struct btrfs_chunk));
2525 ret = -EINVAL;
2526 }
2527
2528 /*
2529 * The generation is a global counter, we'll trust it more than the others
2530 * but it's still possible that it's the one that's wrong.
2531 */
2532 if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
2533 btrfs_warn(fs_info,
2534 "suspicious: generation < chunk_root_generation: %llu < %llu",
2535 btrfs_super_generation(sb),
2536 btrfs_super_chunk_root_generation(sb));
2537 if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
2538 && btrfs_super_cache_generation(sb) != (u64)-1)
2539 btrfs_warn(fs_info,
2540 "suspicious: generation < cache_generation: %llu < %llu",
2541 btrfs_super_generation(sb),
2542 btrfs_super_cache_generation(sb));
2543
2544 return ret;
2545}
2546
2547/*
2548 * Validation of super block at mount time.
2549 * Some checks already done early at mount time, like csum type and incompat
2550 * flags will be skipped.
2551 */
2552static int btrfs_validate_mount_super(struct btrfs_fs_info *fs_info)
2553{
2554 return validate_super(fs_info, fs_info->super_copy, 0);
2555}
2556
2557/*
2558 * Validation of super block at write time.
2559 * Some checks like bytenr check will be skipped as their values will be
2560 * overwritten soon.
2561 * Extra checks like csum type and incompat flags will be done here.
2562 */
2563static int btrfs_validate_write_super(struct btrfs_fs_info *fs_info,
2564 struct btrfs_super_block *sb)
2565{
2566 int ret;
2567
2568 ret = validate_super(fs_info, sb, -1);
2569 if (ret < 0)
2570 goto out;
2571 if (!btrfs_supported_super_csum(btrfs_super_csum_type(sb))) {
2572 ret = -EUCLEAN;
2573 btrfs_err(fs_info, "invalid csum type, has %u want %u",
2574 btrfs_super_csum_type(sb), BTRFS_CSUM_TYPE_CRC32);
2575 goto out;
2576 }
2577 if (btrfs_super_incompat_flags(sb) & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
2578 ret = -EUCLEAN;
2579 btrfs_err(fs_info,
2580 "invalid incompat flags, has 0x%llx valid mask 0x%llx",
2581 btrfs_super_incompat_flags(sb),
2582 (unsigned long long)BTRFS_FEATURE_INCOMPAT_SUPP);
2583 goto out;
2584 }
2585out:
2586 if (ret < 0)
2587 btrfs_err(fs_info,
2588 "super block corruption detected before writing it to disk");
2589 return ret;
2590}
2591
2592int open_ctree(struct super_block *sb,
2593 struct btrfs_fs_devices *fs_devices,
2594 char *options)
2595{
2596 u32 sectorsize;
2597 u32 nodesize;
2598 u32 stripesize;
2599 u64 generation;
2600 u64 features;
2601 u16 csum_type;
2602 struct btrfs_key location;
2603 struct buffer_head *bh;
2604 struct btrfs_super_block *disk_super;
2605 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2606 struct btrfs_root *tree_root;
2607 struct btrfs_root *chunk_root;
2608 int ret;
2609 int err = -EINVAL;
2610 int num_backups_tried = 0;
2611 int backup_index = 0;
2612 int clear_free_space_tree = 0;
2613 int level;
2614
2615 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
2616 chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
2617 if (!tree_root || !chunk_root) {
2618 err = -ENOMEM;
2619 goto fail;
2620 }
2621
2622 ret = init_srcu_struct(&fs_info->subvol_srcu);
2623 if (ret) {
2624 err = ret;
2625 goto fail;
2626 }
2627
2628 ret = percpu_counter_init(&fs_info->dio_bytes, 0, GFP_KERNEL);
2629 if (ret) {
2630 err = ret;
2631 goto fail_srcu;
2632 }
2633
2634 ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
2635 if (ret) {
2636 err = ret;
2637 goto fail_dio_bytes;
2638 }
2639 fs_info->dirty_metadata_batch = PAGE_SIZE *
2640 (1 + ilog2(nr_cpu_ids));
2641
2642 ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
2643 if (ret) {
2644 err = ret;
2645 goto fail_dirty_metadata_bytes;
2646 }
2647
2648 ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
2649 GFP_KERNEL);
2650 if (ret) {
2651 err = ret;
2652 goto fail_delalloc_bytes;
2653 }
2654
2655 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
2656 INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
2657 INIT_LIST_HEAD(&fs_info->trans_list);
2658 INIT_LIST_HEAD(&fs_info->dead_roots);
2659 INIT_LIST_HEAD(&fs_info->delayed_iputs);
2660 INIT_LIST_HEAD(&fs_info->delalloc_roots);
2661 INIT_LIST_HEAD(&fs_info->caching_block_groups);
2662 spin_lock_init(&fs_info->delalloc_root_lock);
2663 spin_lock_init(&fs_info->trans_lock);
2664 spin_lock_init(&fs_info->fs_roots_radix_lock);
2665 spin_lock_init(&fs_info->delayed_iput_lock);
2666 spin_lock_init(&fs_info->defrag_inodes_lock);
2667 spin_lock_init(&fs_info->tree_mod_seq_lock);
2668 spin_lock_init(&fs_info->super_lock);
2669 spin_lock_init(&fs_info->buffer_lock);
2670 spin_lock_init(&fs_info->unused_bgs_lock);
2671 rwlock_init(&fs_info->tree_mod_log_lock);
2672 mutex_init(&fs_info->unused_bg_unpin_mutex);
2673 mutex_init(&fs_info->delete_unused_bgs_mutex);
2674 mutex_init(&fs_info->reloc_mutex);
2675 mutex_init(&fs_info->delalloc_root_mutex);
2676 seqlock_init(&fs_info->profiles_lock);
2677
2678 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
2679 INIT_LIST_HEAD(&fs_info->space_info);
2680 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
2681 INIT_LIST_HEAD(&fs_info->unused_bgs);
2682 extent_map_tree_init(&fs_info->mapping_tree);
2683 btrfs_init_block_rsv(&fs_info->global_block_rsv,
2684 BTRFS_BLOCK_RSV_GLOBAL);
2685 btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
2686 btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
2687 btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
2688 btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
2689 BTRFS_BLOCK_RSV_DELOPS);
2690 btrfs_init_block_rsv(&fs_info->delayed_refs_rsv,
2691 BTRFS_BLOCK_RSV_DELREFS);
2692
2693 atomic_set(&fs_info->async_delalloc_pages, 0);
2694 atomic_set(&fs_info->defrag_running, 0);
2695 atomic_set(&fs_info->reada_works_cnt, 0);
2696 atomic_set(&fs_info->nr_delayed_iputs, 0);
2697 atomic64_set(&fs_info->tree_mod_seq, 0);
2698 fs_info->sb = sb;
2699 fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
2700 fs_info->metadata_ratio = 0;
2701 fs_info->defrag_inodes = RB_ROOT;
2702 atomic64_set(&fs_info->free_chunk_space, 0);
2703 fs_info->tree_mod_log = RB_ROOT;
2704 fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
2705 fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
2706 /* readahead state */
2707 INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
2708 spin_lock_init(&fs_info->reada_lock);
2709 btrfs_init_ref_verify(fs_info);
2710
2711 fs_info->thread_pool_size = min_t(unsigned long,
2712 num_online_cpus() + 2, 8);
2713
2714 INIT_LIST_HEAD(&fs_info->ordered_roots);
2715 spin_lock_init(&fs_info->ordered_root_lock);
2716
2717 fs_info->btree_inode = new_inode(sb);
2718 if (!fs_info->btree_inode) {
2719 err = -ENOMEM;
2720 goto fail_bio_counter;
2721 }
2722 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
2723
2724 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
2725 GFP_KERNEL);
2726 if (!fs_info->delayed_root) {
2727 err = -ENOMEM;
2728 goto fail_iput;
2729 }
2730 btrfs_init_delayed_root(fs_info->delayed_root);
2731
2732 btrfs_init_scrub(fs_info);
2733#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2734 fs_info->check_integrity_print_mask = 0;
2735#endif
2736 btrfs_init_balance(fs_info);
2737 btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work);
2738
2739 sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
2740 sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
2741
2742 btrfs_init_btree_inode(fs_info);
2743
2744 spin_lock_init(&fs_info->block_group_cache_lock);
2745 fs_info->block_group_cache_tree = RB_ROOT;
2746 fs_info->first_logical_byte = (u64)-1;
2747
2748 extent_io_tree_init(fs_info, &fs_info->freed_extents[0],
2749 IO_TREE_FS_INFO_FREED_EXTENTS0, NULL);
2750 extent_io_tree_init(fs_info, &fs_info->freed_extents[1],
2751 IO_TREE_FS_INFO_FREED_EXTENTS1, NULL);
2752 fs_info->pinned_extents = &fs_info->freed_extents[0];
2753 set_bit(BTRFS_FS_BARRIER, &fs_info->flags);
2754
2755 mutex_init(&fs_info->ordered_operations_mutex);
2756 mutex_init(&fs_info->tree_log_mutex);
2757 mutex_init(&fs_info->chunk_mutex);
2758 mutex_init(&fs_info->transaction_kthread_mutex);
2759 mutex_init(&fs_info->cleaner_mutex);
2760 mutex_init(&fs_info->ro_block_group_mutex);
2761 init_rwsem(&fs_info->commit_root_sem);
2762 init_rwsem(&fs_info->cleanup_work_sem);
2763 init_rwsem(&fs_info->subvol_sem);
2764 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
2765
2766 btrfs_init_dev_replace_locks(fs_info);
2767 btrfs_init_qgroup(fs_info);
2768
2769 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
2770 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
2771
2772 init_waitqueue_head(&fs_info->transaction_throttle);
2773 init_waitqueue_head(&fs_info->transaction_wait);
2774 init_waitqueue_head(&fs_info->transaction_blocked_wait);
2775 init_waitqueue_head(&fs_info->async_submit_wait);
2776 init_waitqueue_head(&fs_info->delayed_iputs_wait);
2777
2778 /* Usable values until the real ones are cached from the superblock */
2779 fs_info->nodesize = 4096;
2780 fs_info->sectorsize = 4096;
2781 fs_info->stripesize = 4096;
2782
2783 spin_lock_init(&fs_info->swapfile_pins_lock);
2784 fs_info->swapfile_pins = RB_ROOT;
2785
2786 fs_info->send_in_progress = 0;
2787
2788 ret = btrfs_alloc_stripe_hash_table(fs_info);
2789 if (ret) {
2790 err = ret;
2791 goto fail_alloc;
2792 }
2793
2794 __setup_root(tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
2795
2796 invalidate_bdev(fs_devices->latest_bdev);
2797
2798 /*
2799 * Read super block and check the signature bytes only
2800 */
2801 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
2802 if (IS_ERR(bh)) {
2803 err = PTR_ERR(bh);
2804 goto fail_alloc;
2805 }
2806
2807 /*
2808 * Verify the type first, if that or the the checksum value are
2809 * corrupted, we'll find out
2810 */
2811 csum_type = btrfs_super_csum_type((struct btrfs_super_block *)bh->b_data);
2812 if (!btrfs_supported_super_csum(csum_type)) {
2813 btrfs_err(fs_info, "unsupported checksum algorithm: %u",
2814 csum_type);
2815 err = -EINVAL;
2816 brelse(bh);
2817 goto fail_alloc;
2818 }
2819
2820 ret = btrfs_init_csum_hash(fs_info, csum_type);
2821 if (ret) {
2822 err = ret;
2823 goto fail_alloc;
2824 }
2825
2826 /*
2827 * We want to check superblock checksum, the type is stored inside.
2828 * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
2829 */
2830 if (btrfs_check_super_csum(fs_info, bh->b_data)) {
2831 btrfs_err(fs_info, "superblock checksum mismatch");
2832 err = -EINVAL;
2833 brelse(bh);
2834 goto fail_csum;
2835 }
2836
2837 /*
2838 * super_copy is zeroed at allocation time and we never touch the
2839 * following bytes up to INFO_SIZE, the checksum is calculated from
2840 * the whole block of INFO_SIZE
2841 */
2842 memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy));
2843 brelse(bh);
2844
2845 disk_super = fs_info->super_copy;
2846
2847 ASSERT(!memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid,
2848 BTRFS_FSID_SIZE));
2849
2850 if (btrfs_fs_incompat(fs_info, METADATA_UUID)) {
2851 ASSERT(!memcmp(fs_info->fs_devices->metadata_uuid,
2852 fs_info->super_copy->metadata_uuid,
2853 BTRFS_FSID_SIZE));
2854 }
2855
2856 features = btrfs_super_flags(disk_super);
2857 if (features & BTRFS_SUPER_FLAG_CHANGING_FSID_V2) {
2858 features &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
2859 btrfs_set_super_flags(disk_super, features);
2860 btrfs_info(fs_info,
2861 "found metadata UUID change in progress flag, clearing");
2862 }
2863
2864 memcpy(fs_info->super_for_commit, fs_info->super_copy,
2865 sizeof(*fs_info->super_for_commit));
2866
2867 ret = btrfs_validate_mount_super(fs_info);
2868 if (ret) {
2869 btrfs_err(fs_info, "superblock contains fatal errors");
2870 err = -EINVAL;
2871 goto fail_csum;
2872 }
2873
2874 if (!btrfs_super_root(disk_super))
2875 goto fail_csum;
2876
2877 /* check FS state, whether FS is broken. */
2878 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
2879 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
2880
2881 /*
2882 * run through our array of backup supers and setup
2883 * our ring pointer to the oldest one
2884 */
2885 generation = btrfs_super_generation(disk_super);
2886 find_oldest_super_backup(fs_info, generation);
2887
2888 /*
2889 * In the long term, we'll store the compression type in the super
2890 * block, and it'll be used for per file compression control.
2891 */
2892 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
2893
2894 ret = btrfs_parse_options(fs_info, options, sb->s_flags);
2895 if (ret) {
2896 err = ret;
2897 goto fail_csum;
2898 }
2899
2900 features = btrfs_super_incompat_flags(disk_super) &
2901 ~BTRFS_FEATURE_INCOMPAT_SUPP;
2902 if (features) {
2903 btrfs_err(fs_info,
2904 "cannot mount because of unsupported optional features (%llx)",
2905 features);
2906 err = -EINVAL;
2907 goto fail_csum;
2908 }
2909
2910 features = btrfs_super_incompat_flags(disk_super);
2911 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
2912 if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
2913 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
2914 else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD)
2915 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD;
2916
2917 if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
2918 btrfs_info(fs_info, "has skinny extents");
2919
2920 /*
2921 * flag our filesystem as having big metadata blocks if
2922 * they are bigger than the page size
2923 */
2924 if (btrfs_super_nodesize(disk_super) > PAGE_SIZE) {
2925 if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
2926 btrfs_info(fs_info,
2927 "flagging fs with big metadata feature");
2928 features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
2929 }
2930
2931 nodesize = btrfs_super_nodesize(disk_super);
2932 sectorsize = btrfs_super_sectorsize(disk_super);
2933 stripesize = sectorsize;
2934 fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
2935 fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
2936
2937 /* Cache block sizes */
2938 fs_info->nodesize = nodesize;
2939 fs_info->sectorsize = sectorsize;
2940 fs_info->stripesize = stripesize;
2941
2942 /*
2943 * mixed block groups end up with duplicate but slightly offset
2944 * extent buffers for the same range. It leads to corruptions
2945 */
2946 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
2947 (sectorsize != nodesize)) {
2948 btrfs_err(fs_info,
2949"unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
2950 nodesize, sectorsize);
2951 goto fail_csum;
2952 }
2953
2954 /*
2955 * Needn't use the lock because there is no other task which will
2956 * update the flag.
2957 */
2958 btrfs_set_super_incompat_flags(disk_super, features);
2959
2960 features = btrfs_super_compat_ro_flags(disk_super) &
2961 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
2962 if (!sb_rdonly(sb) && features) {
2963 btrfs_err(fs_info,
2964 "cannot mount read-write because of unsupported optional features (%llx)",
2965 features);
2966 err = -EINVAL;
2967 goto fail_csum;
2968 }
2969
2970 ret = btrfs_init_workqueues(fs_info, fs_devices);
2971 if (ret) {
2972 err = ret;
2973 goto fail_sb_buffer;
2974 }
2975
2976 sb->s_bdi->congested_fn = btrfs_congested_fn;
2977 sb->s_bdi->congested_data = fs_info;
2978 sb->s_bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK;
2979 sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
2980 sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
2981 sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
2982
2983 sb->s_blocksize = sectorsize;
2984 sb->s_blocksize_bits = blksize_bits(sectorsize);
2985 memcpy(&sb->s_uuid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE);
2986
2987 mutex_lock(&fs_info->chunk_mutex);
2988 ret = btrfs_read_sys_array(fs_info);
2989 mutex_unlock(&fs_info->chunk_mutex);
2990 if (ret) {
2991 btrfs_err(fs_info, "failed to read the system array: %d", ret);
2992 goto fail_sb_buffer;
2993 }
2994
2995 generation = btrfs_super_chunk_root_generation(disk_super);
2996 level = btrfs_super_chunk_root_level(disk_super);
2997
2998 __setup_root(chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
2999
3000 chunk_root->node = read_tree_block(fs_info,
3001 btrfs_super_chunk_root(disk_super),
3002 generation, level, NULL);
3003 if (IS_ERR(chunk_root->node) ||
3004 !extent_buffer_uptodate(chunk_root->node)) {
3005 btrfs_err(fs_info, "failed to read chunk root");
3006 if (!IS_ERR(chunk_root->node))
3007 free_extent_buffer(chunk_root->node);
3008 chunk_root->node = NULL;
3009 goto fail_tree_roots;
3010 }
3011 btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
3012 chunk_root->commit_root = btrfs_root_node(chunk_root);
3013
3014 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
3015 btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE);
3016
3017 ret = btrfs_read_chunk_tree(fs_info);
3018 if (ret) {
3019 btrfs_err(fs_info, "failed to read chunk tree: %d", ret);
3020 goto fail_tree_roots;
3021 }
3022
3023 /*
3024 * Keep the devid that is marked to be the target device for the
3025 * device replace procedure
3026 */
3027 btrfs_free_extra_devids(fs_devices, 0);
3028
3029 if (!fs_devices->latest_bdev) {
3030 btrfs_err(fs_info, "failed to read devices");
3031 goto fail_tree_roots;
3032 }
3033
3034retry_root_backup:
3035 generation = btrfs_super_generation(disk_super);
3036 level = btrfs_super_root_level(disk_super);
3037
3038 tree_root->node = read_tree_block(fs_info,
3039 btrfs_super_root(disk_super),
3040 generation, level, NULL);
3041 if (IS_ERR(tree_root->node) ||
3042 !extent_buffer_uptodate(tree_root->node)) {
3043 btrfs_warn(fs_info, "failed to read tree root");
3044 if (!IS_ERR(tree_root->node))
3045 free_extent_buffer(tree_root->node);
3046 tree_root->node = NULL;
3047 goto recovery_tree_root;
3048 }
3049
3050 btrfs_set_root_node(&tree_root->root_item, tree_root->node);
3051 tree_root->commit_root = btrfs_root_node(tree_root);
3052 btrfs_set_root_refs(&tree_root->root_item, 1);
3053
3054 mutex_lock(&tree_root->objectid_mutex);
3055 ret = btrfs_find_highest_objectid(tree_root,
3056 &tree_root->highest_objectid);
3057 if (ret) {
3058 mutex_unlock(&tree_root->objectid_mutex);
3059 goto recovery_tree_root;
3060 }
3061
3062 ASSERT(tree_root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
3063
3064 mutex_unlock(&tree_root->objectid_mutex);
3065
3066 ret = btrfs_read_roots(fs_info);
3067 if (ret)
3068 goto recovery_tree_root;
3069
3070 fs_info->generation = generation;
3071 fs_info->last_trans_committed = generation;
3072
3073 ret = btrfs_verify_dev_extents(fs_info);
3074 if (ret) {
3075 btrfs_err(fs_info,
3076 "failed to verify dev extents against chunks: %d",
3077 ret);
3078 goto fail_block_groups;
3079 }
3080 ret = btrfs_recover_balance(fs_info);
3081 if (ret) {
3082 btrfs_err(fs_info, "failed to recover balance: %d", ret);
3083 goto fail_block_groups;
3084 }
3085
3086 ret = btrfs_init_dev_stats(fs_info);
3087 if (ret) {
3088 btrfs_err(fs_info, "failed to init dev_stats: %d", ret);
3089 goto fail_block_groups;
3090 }
3091
3092 ret = btrfs_init_dev_replace(fs_info);
3093 if (ret) {
3094 btrfs_err(fs_info, "failed to init dev_replace: %d", ret);
3095 goto fail_block_groups;
3096 }
3097
3098 btrfs_free_extra_devids(fs_devices, 1);
3099
3100 ret = btrfs_sysfs_add_fsid(fs_devices, NULL);
3101 if (ret) {
3102 btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
3103 ret);
3104 goto fail_block_groups;
3105 }
3106
3107 ret = btrfs_sysfs_add_device(fs_devices);
3108 if (ret) {
3109 btrfs_err(fs_info, "failed to init sysfs device interface: %d",
3110 ret);
3111 goto fail_fsdev_sysfs;
3112 }
3113
3114 ret = btrfs_sysfs_add_mounted(fs_info);
3115 if (ret) {
3116 btrfs_err(fs_info, "failed to init sysfs interface: %d", ret);
3117 goto fail_fsdev_sysfs;
3118 }
3119
3120 ret = btrfs_init_space_info(fs_info);
3121 if (ret) {
3122 btrfs_err(fs_info, "failed to initialize space info: %d", ret);
3123 goto fail_sysfs;
3124 }
3125
3126 ret = btrfs_read_block_groups(fs_info);
3127 if (ret) {
3128 btrfs_err(fs_info, "failed to read block groups: %d", ret);
3129 goto fail_sysfs;
3130 }
3131
3132 if (!sb_rdonly(sb) && !btrfs_check_rw_degradable(fs_info, NULL)) {
3133 btrfs_warn(fs_info,
3134 "writable mount is not allowed due to too many missing devices");
3135 goto fail_sysfs;
3136 }
3137
3138 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
3139 "btrfs-cleaner");
3140 if (IS_ERR(fs_info->cleaner_kthread))
3141 goto fail_sysfs;
3142
3143 fs_info->transaction_kthread = kthread_run(transaction_kthread,
3144 tree_root,
3145 "btrfs-transaction");
3146 if (IS_ERR(fs_info->transaction_kthread))
3147 goto fail_cleaner;
3148
3149 if (!btrfs_test_opt(fs_info, NOSSD) &&
3150 !fs_info->fs_devices->rotating) {
3151 btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
3152 }
3153
3154 /*
3155 * Mount does not set all options immediately, we can do it now and do
3156 * not have to wait for transaction commit
3157 */
3158 btrfs_apply_pending_changes(fs_info);
3159
3160#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3161 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY)) {
3162 ret = btrfsic_mount(fs_info, fs_devices,
3163 btrfs_test_opt(fs_info,
3164 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ?
3165 1 : 0,
3166 fs_info->check_integrity_print_mask);
3167 if (ret)
3168 btrfs_warn(fs_info,
3169 "failed to initialize integrity check module: %d",
3170 ret);
3171 }
3172#endif
3173 ret = btrfs_read_qgroup_config(fs_info);
3174 if (ret)
3175 goto fail_trans_kthread;
3176
3177 if (btrfs_build_ref_tree(fs_info))
3178 btrfs_err(fs_info, "couldn't build ref tree");
3179
3180 /* do not make disk changes in broken FS or nologreplay is given */
3181 if (btrfs_super_log_root(disk_super) != 0 &&
3182 !btrfs_test_opt(fs_info, NOLOGREPLAY)) {
3183 ret = btrfs_replay_log(fs_info, fs_devices);
3184 if (ret) {
3185 err = ret;
3186 goto fail_qgroup;
3187 }
3188 }
3189
3190 ret = btrfs_find_orphan_roots(fs_info);
3191 if (ret)
3192 goto fail_qgroup;
3193
3194 if (!sb_rdonly(sb)) {
3195 ret = btrfs_cleanup_fs_roots(fs_info);
3196 if (ret)
3197 goto fail_qgroup;
3198
3199 mutex_lock(&fs_info->cleaner_mutex);
3200 ret = btrfs_recover_relocation(tree_root);
3201 mutex_unlock(&fs_info->cleaner_mutex);
3202 if (ret < 0) {
3203 btrfs_warn(fs_info, "failed to recover relocation: %d",
3204 ret);
3205 err = -EINVAL;
3206 goto fail_qgroup;
3207 }
3208 }
3209
3210 location.objectid = BTRFS_FS_TREE_OBJECTID;
3211 location.type = BTRFS_ROOT_ITEM_KEY;
3212 location.offset = 0;
3213
3214 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
3215 if (IS_ERR(fs_info->fs_root)) {
3216 err = PTR_ERR(fs_info->fs_root);
3217 btrfs_warn(fs_info, "failed to read fs tree: %d", err);
3218 goto fail_qgroup;
3219 }
3220
3221 if (sb_rdonly(sb))
3222 return 0;
3223
3224 if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
3225 btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3226 clear_free_space_tree = 1;
3227 } else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
3228 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
3229 btrfs_warn(fs_info, "free space tree is invalid");
3230 clear_free_space_tree = 1;
3231 }
3232
3233 if (clear_free_space_tree) {
3234 btrfs_info(fs_info, "clearing free space tree");
3235 ret = btrfs_clear_free_space_tree(fs_info);
3236 if (ret) {
3237 btrfs_warn(fs_info,
3238 "failed to clear free space tree: %d", ret);
3239 close_ctree(fs_info);
3240 return ret;
3241 }
3242 }
3243
3244 if (btrfs_test_opt(fs_info, FREE_SPACE_TREE) &&
3245 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3246 btrfs_info(fs_info, "creating free space tree");
3247 ret = btrfs_create_free_space_tree(fs_info);
3248 if (ret) {
3249 btrfs_warn(fs_info,
3250 "failed to create free space tree: %d", ret);
3251 close_ctree(fs_info);
3252 return ret;
3253 }
3254 }
3255
3256 down_read(&fs_info->cleanup_work_sem);
3257 if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
3258 (ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
3259 up_read(&fs_info->cleanup_work_sem);
3260 close_ctree(fs_info);
3261 return ret;
3262 }
3263 up_read(&fs_info->cleanup_work_sem);
3264
3265 ret = btrfs_resume_balance_async(fs_info);
3266 if (ret) {
3267 btrfs_warn(fs_info, "failed to resume balance: %d", ret);
3268 close_ctree(fs_info);
3269 return ret;
3270 }
3271
3272 ret = btrfs_resume_dev_replace_async(fs_info);
3273 if (ret) {
3274 btrfs_warn(fs_info, "failed to resume device replace: %d", ret);
3275 close_ctree(fs_info);
3276 return ret;
3277 }
3278
3279 btrfs_qgroup_rescan_resume(fs_info);
3280
3281 if (!fs_info->uuid_root) {
3282 btrfs_info(fs_info, "creating UUID tree");
3283 ret = btrfs_create_uuid_tree(fs_info);
3284 if (ret) {
3285 btrfs_warn(fs_info,
3286 "failed to create the UUID tree: %d", ret);
3287 close_ctree(fs_info);
3288 return ret;
3289 }
3290 } else if (btrfs_test_opt(fs_info, RESCAN_UUID_TREE) ||
3291 fs_info->generation !=
3292 btrfs_super_uuid_tree_generation(disk_super)) {
3293 btrfs_info(fs_info, "checking UUID tree");
3294 ret = btrfs_check_uuid_tree(fs_info);
3295 if (ret) {
3296 btrfs_warn(fs_info,
3297 "failed to check the UUID tree: %d", ret);
3298 close_ctree(fs_info);
3299 return ret;
3300 }
3301 } else {
3302 set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
3303 }
3304 set_bit(BTRFS_FS_OPEN, &fs_info->flags);
3305
3306 /*
3307 * backuproot only affect mount behavior, and if open_ctree succeeded,
3308 * no need to keep the flag
3309 */
3310 btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
3311
3312 return 0;
3313
3314fail_qgroup:
3315 btrfs_free_qgroup_config(fs_info);
3316fail_trans_kthread:
3317 kthread_stop(fs_info->transaction_kthread);
3318 btrfs_cleanup_transaction(fs_info);
3319 btrfs_free_fs_roots(fs_info);
3320fail_cleaner:
3321 kthread_stop(fs_info->cleaner_kthread);
3322
3323 /*
3324 * make sure we're done with the btree inode before we stop our
3325 * kthreads
3326 */
3327 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
3328
3329fail_sysfs:
3330 btrfs_sysfs_remove_mounted(fs_info);
3331
3332fail_fsdev_sysfs:
3333 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
3334
3335fail_block_groups:
3336 btrfs_put_block_group_cache(fs_info);
3337
3338fail_tree_roots:
3339 free_root_pointers(fs_info, 1);
3340 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
3341
3342fail_sb_buffer:
3343 btrfs_stop_all_workers(fs_info);
3344 btrfs_free_block_groups(fs_info);
3345fail_csum:
3346 btrfs_free_csum_hash(fs_info);
3347fail_alloc:
3348fail_iput:
3349 btrfs_mapping_tree_free(&fs_info->mapping_tree);
3350
3351 iput(fs_info->btree_inode);
3352fail_bio_counter:
3353 percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
3354fail_delalloc_bytes:
3355 percpu_counter_destroy(&fs_info->delalloc_bytes);
3356fail_dirty_metadata_bytes:
3357 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
3358fail_dio_bytes:
3359 percpu_counter_destroy(&fs_info->dio_bytes);
3360fail_srcu:
3361 cleanup_srcu_struct(&fs_info->subvol_srcu);
3362fail:
3363 btrfs_free_stripe_hash_table(fs_info);
3364 btrfs_close_devices(fs_info->fs_devices);
3365 return err;
3366
3367recovery_tree_root:
3368 if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
3369 goto fail_tree_roots;
3370
3371 free_root_pointers(fs_info, 0);
3372
3373 /* don't use the log in recovery mode, it won't be valid */
3374 btrfs_set_super_log_root(disk_super, 0);
3375
3376 /* we can't trust the free space cache either */
3377 btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
3378
3379 ret = next_root_backup(fs_info, fs_info->super_copy,
3380 &num_backups_tried, &backup_index);
3381 if (ret == -1)
3382 goto fail_block_groups;
3383 goto retry_root_backup;
3384}
3385ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
3386
3387static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
3388{
3389 if (uptodate) {
3390 set_buffer_uptodate(bh);
3391 } else {
3392 struct btrfs_device *device = (struct btrfs_device *)
3393 bh->b_private;
3394
3395 btrfs_warn_rl_in_rcu(device->fs_info,
3396 "lost page write due to IO error on %s",
3397 rcu_str_deref(device->name));
3398 /* note, we don't set_buffer_write_io_error because we have
3399 * our own ways of dealing with the IO errors
3400 */
3401 clear_buffer_uptodate(bh);
3402 btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS);
3403 }
3404 unlock_buffer(bh);
3405 put_bh(bh);
3406}
3407
3408int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
3409 struct buffer_head **bh_ret)
3410{
3411 struct buffer_head *bh;
3412 struct btrfs_super_block *super;
3413 u64 bytenr;
3414
3415 bytenr = btrfs_sb_offset(copy_num);
3416 if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode))
3417 return -EINVAL;
3418
3419 bh = __bread(bdev, bytenr / BTRFS_BDEV_BLOCKSIZE, BTRFS_SUPER_INFO_SIZE);
3420 /*
3421 * If we fail to read from the underlying devices, as of now
3422 * the best option we have is to mark it EIO.
3423 */
3424 if (!bh)
3425 return -EIO;
3426
3427 super = (struct btrfs_super_block *)bh->b_data;
3428 if (btrfs_super_bytenr(super) != bytenr ||
3429 btrfs_super_magic(super) != BTRFS_MAGIC) {
3430 brelse(bh);
3431 return -EINVAL;
3432 }
3433
3434 *bh_ret = bh;
3435 return 0;
3436}
3437
3438
3439struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
3440{
3441 struct buffer_head *bh;
3442 struct buffer_head *latest = NULL;
3443 struct btrfs_super_block *super;
3444 int i;
3445 u64 transid = 0;
3446 int ret = -EINVAL;
3447
3448 /* we would like to check all the supers, but that would make
3449 * a btrfs mount succeed after a mkfs from a different FS.
3450 * So, we need to add a special mount option to scan for
3451 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
3452 */
3453 for (i = 0; i < 1; i++) {
3454 ret = btrfs_read_dev_one_super(bdev, i, &bh);
3455 if (ret)
3456 continue;
3457
3458 super = (struct btrfs_super_block *)bh->b_data;
3459
3460 if (!latest || btrfs_super_generation(super) > transid) {
3461 brelse(latest);
3462 latest = bh;
3463 transid = btrfs_super_generation(super);
3464 } else {
3465 brelse(bh);
3466 }
3467 }
3468
3469 if (!latest)
3470 return ERR_PTR(ret);
3471
3472 return latest;
3473}
3474
3475/*
3476 * Write superblock @sb to the @device. Do not wait for completion, all the
3477 * buffer heads we write are pinned.
3478 *
3479 * Write @max_mirrors copies of the superblock, where 0 means default that fit
3480 * the expected device size at commit time. Note that max_mirrors must be
3481 * same for write and wait phases.
3482 *
3483 * Return number of errors when buffer head is not found or submission fails.
3484 */
3485static int write_dev_supers(struct btrfs_device *device,
3486 struct btrfs_super_block *sb, int max_mirrors)
3487{
3488 struct btrfs_fs_info *fs_info = device->fs_info;
3489 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
3490 struct buffer_head *bh;
3491 int i;
3492 int ret;
3493 int errors = 0;
3494 u64 bytenr;
3495 int op_flags;
3496
3497 if (max_mirrors == 0)
3498 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
3499
3500 shash->tfm = fs_info->csum_shash;
3501
3502 for (i = 0; i < max_mirrors; i++) {
3503 bytenr = btrfs_sb_offset(i);
3504 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
3505 device->commit_total_bytes)
3506 break;
3507
3508 btrfs_set_super_bytenr(sb, bytenr);
3509
3510 crypto_shash_init(shash);
3511 crypto_shash_update(shash, (const char *)sb + BTRFS_CSUM_SIZE,
3512 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
3513 crypto_shash_final(shash, sb->csum);
3514
3515 /* One reference for us, and we leave it for the caller */
3516 bh = __getblk(device->bdev, bytenr / BTRFS_BDEV_BLOCKSIZE,
3517 BTRFS_SUPER_INFO_SIZE);
3518 if (!bh) {
3519 btrfs_err(device->fs_info,
3520 "couldn't get super buffer head for bytenr %llu",
3521 bytenr);
3522 errors++;
3523 continue;
3524 }
3525
3526 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
3527
3528 /* one reference for submit_bh */
3529 get_bh(bh);
3530
3531 set_buffer_uptodate(bh);
3532 lock_buffer(bh);
3533 bh->b_end_io = btrfs_end_buffer_write_sync;
3534 bh->b_private = device;
3535
3536 /*
3537 * we fua the first super. The others we allow
3538 * to go down lazy.
3539 */
3540 op_flags = REQ_SYNC | REQ_META | REQ_PRIO;
3541 if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER))
3542 op_flags |= REQ_FUA;
3543 ret = btrfsic_submit_bh(REQ_OP_WRITE, op_flags, bh);
3544 if (ret)
3545 errors++;
3546 }
3547 return errors < i ? 0 : -1;
3548}
3549
3550/*
3551 * Wait for write completion of superblocks done by write_dev_supers,
3552 * @max_mirrors same for write and wait phases.
3553 *
3554 * Return number of errors when buffer head is not found or not marked up to
3555 * date.
3556 */
3557static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
3558{
3559 struct buffer_head *bh;
3560 int i;
3561 int errors = 0;
3562 bool primary_failed = false;
3563 u64 bytenr;
3564
3565 if (max_mirrors == 0)
3566 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
3567
3568 for (i = 0; i < max_mirrors; i++) {
3569 bytenr = btrfs_sb_offset(i);
3570 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
3571 device->commit_total_bytes)
3572 break;
3573
3574 bh = __find_get_block(device->bdev,
3575 bytenr / BTRFS_BDEV_BLOCKSIZE,
3576 BTRFS_SUPER_INFO_SIZE);
3577 if (!bh) {
3578 errors++;
3579 if (i == 0)
3580 primary_failed = true;
3581 continue;
3582 }
3583 wait_on_buffer(bh);
3584 if (!buffer_uptodate(bh)) {
3585 errors++;
3586 if (i == 0)
3587 primary_failed = true;
3588 }
3589
3590 /* drop our reference */
3591 brelse(bh);
3592
3593 /* drop the reference from the writing run */
3594 brelse(bh);
3595 }
3596
3597 /* log error, force error return */
3598 if (primary_failed) {
3599 btrfs_err(device->fs_info, "error writing primary super block to device %llu",
3600 device->devid);
3601 return -1;
3602 }
3603
3604 return errors < i ? 0 : -1;
3605}
3606
3607/*
3608 * endio for the write_dev_flush, this will wake anyone waiting
3609 * for the barrier when it is done
3610 */
3611static void btrfs_end_empty_barrier(struct bio *bio)
3612{
3613 complete(bio->bi_private);
3614}
3615
3616/*
3617 * Submit a flush request to the device if it supports it. Error handling is
3618 * done in the waiting counterpart.
3619 */
3620static void write_dev_flush(struct btrfs_device *device)
3621{
3622 struct request_queue *q = bdev_get_queue(device->bdev);
3623 struct bio *bio = device->flush_bio;
3624
3625 if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
3626 return;
3627
3628 bio_reset(bio);
3629 bio->bi_end_io = btrfs_end_empty_barrier;
3630 bio_set_dev(bio, device->bdev);
3631 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH;
3632 init_completion(&device->flush_wait);
3633 bio->bi_private = &device->flush_wait;
3634
3635 btrfsic_submit_bio(bio);
3636 set_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
3637}
3638
3639/*
3640 * If the flush bio has been submitted by write_dev_flush, wait for it.
3641 */
3642static blk_status_t wait_dev_flush(struct btrfs_device *device)
3643{
3644 struct bio *bio = device->flush_bio;
3645
3646 if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
3647 return BLK_STS_OK;
3648
3649 clear_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
3650 wait_for_completion_io(&device->flush_wait);
3651
3652 return bio->bi_status;
3653}
3654
3655static int check_barrier_error(struct btrfs_fs_info *fs_info)
3656{
3657 if (!btrfs_check_rw_degradable(fs_info, NULL))
3658 return -EIO;
3659 return 0;
3660}
3661
3662/*
3663 * send an empty flush down to each device in parallel,
3664 * then wait for them
3665 */
3666static int barrier_all_devices(struct btrfs_fs_info *info)
3667{
3668 struct list_head *head;
3669 struct btrfs_device *dev;
3670 int errors_wait = 0;
3671 blk_status_t ret;
3672
3673 lockdep_assert_held(&info->fs_devices->device_list_mutex);
3674 /* send down all the barriers */
3675 head = &info->fs_devices->devices;
3676 list_for_each_entry(dev, head, dev_list) {
3677 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
3678 continue;
3679 if (!dev->bdev)
3680 continue;
3681 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3682 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3683 continue;
3684
3685 write_dev_flush(dev);
3686 dev->last_flush_error = BLK_STS_OK;
3687 }
3688
3689 /* wait for all the barriers */
3690 list_for_each_entry(dev, head, dev_list) {
3691 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
3692 continue;
3693 if (!dev->bdev) {
3694 errors_wait++;
3695 continue;
3696 }
3697 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3698 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3699 continue;
3700
3701 ret = wait_dev_flush(dev);
3702 if (ret) {
3703 dev->last_flush_error = ret;
3704 btrfs_dev_stat_inc_and_print(dev,
3705 BTRFS_DEV_STAT_FLUSH_ERRS);
3706 errors_wait++;
3707 }
3708 }
3709
3710 if (errors_wait) {
3711 /*
3712 * At some point we need the status of all disks
3713 * to arrive at the volume status. So error checking
3714 * is being pushed to a separate loop.
3715 */
3716 return check_barrier_error(info);
3717 }
3718 return 0;
3719}
3720
3721int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
3722{
3723 int raid_type;
3724 int min_tolerated = INT_MAX;
3725
3726 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 ||
3727 (flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE))
3728 min_tolerated = min_t(int, min_tolerated,
3729 btrfs_raid_array[BTRFS_RAID_SINGLE].
3730 tolerated_failures);
3731
3732 for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
3733 if (raid_type == BTRFS_RAID_SINGLE)
3734 continue;
3735 if (!(flags & btrfs_raid_array[raid_type].bg_flag))
3736 continue;
3737 min_tolerated = min_t(int, min_tolerated,
3738 btrfs_raid_array[raid_type].
3739 tolerated_failures);
3740 }
3741
3742 if (min_tolerated == INT_MAX) {
3743 pr_warn("BTRFS: unknown raid flag: %llu", flags);
3744 min_tolerated = 0;
3745 }
3746
3747 return min_tolerated;
3748}
3749
3750int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
3751{
3752 struct list_head *head;
3753 struct btrfs_device *dev;
3754 struct btrfs_super_block *sb;
3755 struct btrfs_dev_item *dev_item;
3756 int ret;
3757 int do_barriers;
3758 int max_errors;
3759 int total_errors = 0;
3760 u64 flags;
3761
3762 do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);
3763
3764 /*
3765 * max_mirrors == 0 indicates we're from commit_transaction,
3766 * not from fsync where the tree roots in fs_info have not
3767 * been consistent on disk.
3768 */
3769 if (max_mirrors == 0)
3770 backup_super_roots(fs_info);
3771
3772 sb = fs_info->super_for_commit;
3773 dev_item = &sb->dev_item;
3774
3775 mutex_lock(&fs_info->fs_devices->device_list_mutex);
3776 head = &fs_info->fs_devices->devices;
3777 max_errors = btrfs_super_num_devices(fs_info->super_copy) - 1;
3778
3779 if (do_barriers) {
3780 ret = barrier_all_devices(fs_info);
3781 if (ret) {
3782 mutex_unlock(
3783 &fs_info->fs_devices->device_list_mutex);
3784 btrfs_handle_fs_error(fs_info, ret,
3785 "errors while submitting device barriers.");
3786 return ret;
3787 }
3788 }
3789
3790 list_for_each_entry(dev, head, dev_list) {
3791 if (!dev->bdev) {
3792 total_errors++;
3793 continue;
3794 }
3795 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3796 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3797 continue;
3798
3799 btrfs_set_stack_device_generation(dev_item, 0);
3800 btrfs_set_stack_device_type(dev_item, dev->type);
3801 btrfs_set_stack_device_id(dev_item, dev->devid);
3802 btrfs_set_stack_device_total_bytes(dev_item,
3803 dev->commit_total_bytes);
3804 btrfs_set_stack_device_bytes_used(dev_item,
3805 dev->commit_bytes_used);
3806 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
3807 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
3808 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
3809 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
3810 memcpy(dev_item->fsid, dev->fs_devices->metadata_uuid,
3811 BTRFS_FSID_SIZE);
3812
3813 flags = btrfs_super_flags(sb);
3814 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
3815
3816 ret = btrfs_validate_write_super(fs_info, sb);
3817 if (ret < 0) {
3818 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3819 btrfs_handle_fs_error(fs_info, -EUCLEAN,
3820 "unexpected superblock corruption detected");
3821 return -EUCLEAN;
3822 }
3823
3824 ret = write_dev_supers(dev, sb, max_mirrors);
3825 if (ret)
3826 total_errors++;
3827 }
3828 if (total_errors > max_errors) {
3829 btrfs_err(fs_info, "%d errors while writing supers",
3830 total_errors);
3831 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3832
3833 /* FUA is masked off if unsupported and can't be the reason */
3834 btrfs_handle_fs_error(fs_info, -EIO,
3835 "%d errors while writing supers",
3836 total_errors);
3837 return -EIO;
3838 }
3839
3840 total_errors = 0;
3841 list_for_each_entry(dev, head, dev_list) {
3842 if (!dev->bdev)
3843 continue;
3844 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3845 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3846 continue;
3847
3848 ret = wait_dev_supers(dev, max_mirrors);
3849 if (ret)
3850 total_errors++;
3851 }
3852 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3853 if (total_errors > max_errors) {
3854 btrfs_handle_fs_error(fs_info, -EIO,
3855 "%d errors while writing supers",
3856 total_errors);
3857 return -EIO;
3858 }
3859 return 0;
3860}
3861
3862/* Drop a fs root from the radix tree and free it. */
3863void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
3864 struct btrfs_root *root)
3865{
3866 spin_lock(&fs_info->fs_roots_radix_lock);
3867 radix_tree_delete(&fs_info->fs_roots_radix,
3868 (unsigned long)root->root_key.objectid);
3869 spin_unlock(&fs_info->fs_roots_radix_lock);
3870
3871 if (btrfs_root_refs(&root->root_item) == 0)
3872 synchronize_srcu(&fs_info->subvol_srcu);
3873
3874 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
3875 btrfs_free_log(NULL, root);
3876 if (root->reloc_root) {
3877 free_extent_buffer(root->reloc_root->node);
3878 free_extent_buffer(root->reloc_root->commit_root);
3879 btrfs_put_fs_root(root->reloc_root);
3880 root->reloc_root = NULL;
3881 }
3882 }
3883
3884 if (root->free_ino_pinned)
3885 __btrfs_remove_free_space_cache(root->free_ino_pinned);
3886 if (root->free_ino_ctl)
3887 __btrfs_remove_free_space_cache(root->free_ino_ctl);
3888 btrfs_free_fs_root(root);
3889}
3890
3891void btrfs_free_fs_root(struct btrfs_root *root)
3892{
3893 iput(root->ino_cache_inode);
3894 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
3895 if (root->anon_dev)
3896 free_anon_bdev(root->anon_dev);
3897 if (root->subv_writers)
3898 btrfs_free_subvolume_writers(root->subv_writers);
3899 free_extent_buffer(root->node);
3900 free_extent_buffer(root->commit_root);
3901 kfree(root->free_ino_ctl);
3902 kfree(root->free_ino_pinned);
3903 btrfs_put_fs_root(root);
3904}
3905
3906int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
3907{
3908 u64 root_objectid = 0;
3909 struct btrfs_root *gang[8];
3910 int i = 0;
3911 int err = 0;
3912 unsigned int ret = 0;
3913 int index;
3914
3915 while (1) {
3916 index = srcu_read_lock(&fs_info->subvol_srcu);
3917 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
3918 (void **)gang, root_objectid,
3919 ARRAY_SIZE(gang));
3920 if (!ret) {
3921 srcu_read_unlock(&fs_info->subvol_srcu, index);
3922 break;
3923 }
3924 root_objectid = gang[ret - 1]->root_key.objectid + 1;
3925
3926 for (i = 0; i < ret; i++) {
3927 /* Avoid to grab roots in dead_roots */
3928 if (btrfs_root_refs(&gang[i]->root_item) == 0) {
3929 gang[i] = NULL;
3930 continue;
3931 }
3932 /* grab all the search result for later use */
3933 gang[i] = btrfs_grab_fs_root(gang[i]);
3934 }
3935 srcu_read_unlock(&fs_info->subvol_srcu, index);
3936
3937 for (i = 0; i < ret; i++) {
3938 if (!gang[i])
3939 continue;
3940 root_objectid = gang[i]->root_key.objectid;
3941 err = btrfs_orphan_cleanup(gang[i]);
3942 if (err)
3943 break;
3944 btrfs_put_fs_root(gang[i]);
3945 }
3946 root_objectid++;
3947 }
3948
3949 /* release the uncleaned roots due to error */
3950 for (; i < ret; i++) {
3951 if (gang[i])
3952 btrfs_put_fs_root(gang[i]);
3953 }
3954 return err;
3955}
3956
3957int btrfs_commit_super(struct btrfs_fs_info *fs_info)
3958{
3959 struct btrfs_root *root = fs_info->tree_root;
3960 struct btrfs_trans_handle *trans;
3961
3962 mutex_lock(&fs_info->cleaner_mutex);
3963 btrfs_run_delayed_iputs(fs_info);
3964 mutex_unlock(&fs_info->cleaner_mutex);
3965 wake_up_process(fs_info->cleaner_kthread);
3966
3967 /* wait until ongoing cleanup work done */
3968 down_write(&fs_info->cleanup_work_sem);
3969 up_write(&fs_info->cleanup_work_sem);
3970
3971 trans = btrfs_join_transaction(root);
3972 if (IS_ERR(trans))
3973 return PTR_ERR(trans);
3974 return btrfs_commit_transaction(trans);
3975}
3976
3977void close_ctree(struct btrfs_fs_info *fs_info)
3978{
3979 int ret;
3980
3981 set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
3982 /*
3983 * We don't want the cleaner to start new transactions, add more delayed
3984 * iputs, etc. while we're closing. We can't use kthread_stop() yet
3985 * because that frees the task_struct, and the transaction kthread might
3986 * still try to wake up the cleaner.
3987 */
3988 kthread_park(fs_info->cleaner_kthread);
3989
3990 /* wait for the qgroup rescan worker to stop */
3991 btrfs_qgroup_wait_for_completion(fs_info, false);
3992
3993 /* wait for the uuid_scan task to finish */
3994 down(&fs_info->uuid_tree_rescan_sem);
3995 /* avoid complains from lockdep et al., set sem back to initial state */
3996 up(&fs_info->uuid_tree_rescan_sem);
3997
3998 /* pause restriper - we want to resume on mount */
3999 btrfs_pause_balance(fs_info);
4000
4001 btrfs_dev_replace_suspend_for_unmount(fs_info);
4002
4003 btrfs_scrub_cancel(fs_info);
4004
4005 /* wait for any defraggers to finish */
4006 wait_event(fs_info->transaction_wait,
4007 (atomic_read(&fs_info->defrag_running) == 0));
4008
4009 /* clear out the rbtree of defraggable inodes */
4010 btrfs_cleanup_defrag_inodes(fs_info);
4011
4012 cancel_work_sync(&fs_info->async_reclaim_work);
4013
4014 if (!sb_rdonly(fs_info->sb)) {
4015 /*
4016 * The cleaner kthread is stopped, so do one final pass over
4017 * unused block groups.
4018 */
4019 btrfs_delete_unused_bgs(fs_info);
4020
4021 ret = btrfs_commit_super(fs_info);
4022 if (ret)
4023 btrfs_err(fs_info, "commit super ret %d", ret);
4024 }
4025
4026 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state) ||
4027 test_bit(BTRFS_FS_STATE_TRANS_ABORTED, &fs_info->fs_state))
4028 btrfs_error_commit_super(fs_info);
4029
4030 kthread_stop(fs_info->transaction_kthread);
4031 kthread_stop(fs_info->cleaner_kthread);
4032
4033 ASSERT(list_empty(&fs_info->delayed_iputs));
4034 set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
4035
4036 btrfs_free_qgroup_config(fs_info);
4037 ASSERT(list_empty(&fs_info->delalloc_roots));
4038
4039 if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
4040 btrfs_info(fs_info, "at unmount delalloc count %lld",
4041 percpu_counter_sum(&fs_info->delalloc_bytes));
4042 }
4043
4044 if (percpu_counter_sum(&fs_info->dio_bytes))
4045 btrfs_info(fs_info, "at unmount dio bytes count %lld",
4046 percpu_counter_sum(&fs_info->dio_bytes));
4047
4048 btrfs_sysfs_remove_mounted(fs_info);
4049 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
4050
4051 btrfs_free_fs_roots(fs_info);
4052
4053 btrfs_put_block_group_cache(fs_info);
4054
4055 /*
4056 * we must make sure there is not any read request to
4057 * submit after we stopping all workers.
4058 */
4059 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
4060 btrfs_stop_all_workers(fs_info);
4061
4062 btrfs_free_block_groups(fs_info);
4063
4064 clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
4065 free_root_pointers(fs_info, 1);
4066
4067 iput(fs_info->btree_inode);
4068
4069#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4070 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY))
4071 btrfsic_unmount(fs_info->fs_devices);
4072#endif
4073
4074 btrfs_mapping_tree_free(&fs_info->mapping_tree);
4075 btrfs_close_devices(fs_info->fs_devices);
4076
4077 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
4078 percpu_counter_destroy(&fs_info->delalloc_bytes);
4079 percpu_counter_destroy(&fs_info->dio_bytes);
4080 percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
4081 cleanup_srcu_struct(&fs_info->subvol_srcu);
4082
4083 btrfs_free_csum_hash(fs_info);
4084 btrfs_free_stripe_hash_table(fs_info);
4085 btrfs_free_ref_cache(fs_info);
4086}
4087
4088int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
4089 int atomic)
4090{
4091 int ret;
4092 struct inode *btree_inode = buf->pages[0]->mapping->host;
4093
4094 ret = extent_buffer_uptodate(buf);
4095 if (!ret)
4096 return ret;
4097
4098 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
4099 parent_transid, atomic);
4100 if (ret == -EAGAIN)
4101 return ret;
4102 return !ret;
4103}
4104
4105void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
4106{
4107 struct btrfs_fs_info *fs_info;
4108 struct btrfs_root *root;
4109 u64 transid = btrfs_header_generation(buf);
4110 int was_dirty;
4111
4112#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4113 /*
4114 * This is a fast path so only do this check if we have sanity tests
4115 * enabled. Normal people shouldn't be using unmapped buffers as dirty
4116 * outside of the sanity tests.
4117 */
4118 if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &buf->bflags)))
4119 return;
4120#endif
4121 root = BTRFS_I(buf->pages[0]->mapping->host)->root;
4122 fs_info = root->fs_info;
4123 btrfs_assert_tree_locked(buf);
4124 if (transid != fs_info->generation)
4125 WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n",
4126 buf->start, transid, fs_info->generation);
4127 was_dirty = set_extent_buffer_dirty(buf);
4128 if (!was_dirty)
4129 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
4130 buf->len,
4131 fs_info->dirty_metadata_batch);
4132#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4133 /*
4134 * Since btrfs_mark_buffer_dirty() can be called with item pointer set
4135 * but item data not updated.
4136 * So here we should only check item pointers, not item data.
4137 */
4138 if (btrfs_header_level(buf) == 0 &&
4139 btrfs_check_leaf_relaxed(buf)) {
4140 btrfs_print_leaf(buf);
4141 ASSERT(0);
4142 }
4143#endif
4144}
4145
4146static void __btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info,
4147 int flush_delayed)
4148{
4149 /*
4150 * looks as though older kernels can get into trouble with
4151 * this code, they end up stuck in balance_dirty_pages forever
4152 */
4153 int ret;
4154
4155 if (current->flags & PF_MEMALLOC)
4156 return;
4157
4158 if (flush_delayed)
4159 btrfs_balance_delayed_items(fs_info);
4160
4161 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
4162 BTRFS_DIRTY_METADATA_THRESH,
4163 fs_info->dirty_metadata_batch);
4164 if (ret > 0) {
4165 balance_dirty_pages_ratelimited(fs_info->btree_inode->i_mapping);
4166 }
4167}
4168
4169void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info)
4170{
4171 __btrfs_btree_balance_dirty(fs_info, 1);
4172}
4173
4174void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info)
4175{
4176 __btrfs_btree_balance_dirty(fs_info, 0);
4177}
4178
4179int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
4180 struct btrfs_key *first_key)
4181{
4182 return btree_read_extent_buffer_pages(buf, parent_transid,
4183 level, first_key);
4184}
4185
4186static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info)
4187{
4188 /* cleanup FS via transaction */
4189 btrfs_cleanup_transaction(fs_info);
4190
4191 mutex_lock(&fs_info->cleaner_mutex);
4192 btrfs_run_delayed_iputs(fs_info);
4193 mutex_unlock(&fs_info->cleaner_mutex);
4194
4195 down_write(&fs_info->cleanup_work_sem);
4196 up_write(&fs_info->cleanup_work_sem);
4197}
4198
4199static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
4200{
4201 struct btrfs_ordered_extent *ordered;
4202
4203 spin_lock(&root->ordered_extent_lock);
4204 /*
4205 * This will just short circuit the ordered completion stuff which will
4206 * make sure the ordered extent gets properly cleaned up.
4207 */
4208 list_for_each_entry(ordered, &root->ordered_extents,
4209 root_extent_list)
4210 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
4211 spin_unlock(&root->ordered_extent_lock);
4212}
4213
4214static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
4215{
4216 struct btrfs_root *root;
4217 struct list_head splice;
4218
4219 INIT_LIST_HEAD(&splice);
4220
4221 spin_lock(&fs_info->ordered_root_lock);
4222 list_splice_init(&fs_info->ordered_roots, &splice);
4223 while (!list_empty(&splice)) {
4224 root = list_first_entry(&splice, struct btrfs_root,
4225 ordered_root);
4226 list_move_tail(&root->ordered_root,
4227 &fs_info->ordered_roots);
4228
4229 spin_unlock(&fs_info->ordered_root_lock);
4230 btrfs_destroy_ordered_extents(root);
4231
4232 cond_resched();
4233 spin_lock(&fs_info->ordered_root_lock);
4234 }
4235 spin_unlock(&fs_info->ordered_root_lock);
4236
4237 /*
4238 * We need this here because if we've been flipped read-only we won't
4239 * get sync() from the umount, so we need to make sure any ordered
4240 * extents that haven't had their dirty pages IO start writeout yet
4241 * actually get run and error out properly.
4242 */
4243 btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
4244}
4245
4246static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
4247 struct btrfs_fs_info *fs_info)
4248{
4249 struct rb_node *node;
4250 struct btrfs_delayed_ref_root *delayed_refs;
4251 struct btrfs_delayed_ref_node *ref;
4252 int ret = 0;
4253
4254 delayed_refs = &trans->delayed_refs;
4255
4256 spin_lock(&delayed_refs->lock);
4257 if (atomic_read(&delayed_refs->num_entries) == 0) {
4258 spin_unlock(&delayed_refs->lock);
4259 btrfs_info(fs_info, "delayed_refs has NO entry");
4260 return ret;
4261 }
4262
4263 while ((node = rb_first_cached(&delayed_refs->href_root)) != NULL) {
4264 struct btrfs_delayed_ref_head *head;
4265 struct rb_node *n;
4266 bool pin_bytes = false;
4267
4268 head = rb_entry(node, struct btrfs_delayed_ref_head,
4269 href_node);
4270 if (btrfs_delayed_ref_lock(delayed_refs, head))
4271 continue;
4272
4273 spin_lock(&head->lock);
4274 while ((n = rb_first_cached(&head->ref_tree)) != NULL) {
4275 ref = rb_entry(n, struct btrfs_delayed_ref_node,
4276 ref_node);
4277 ref->in_tree = 0;
4278 rb_erase_cached(&ref->ref_node, &head->ref_tree);
4279 RB_CLEAR_NODE(&ref->ref_node);
4280 if (!list_empty(&ref->add_list))
4281 list_del(&ref->add_list);
4282 atomic_dec(&delayed_refs->num_entries);
4283 btrfs_put_delayed_ref(ref);
4284 }
4285 if (head->must_insert_reserved)
4286 pin_bytes = true;
4287 btrfs_free_delayed_extent_op(head->extent_op);
4288 btrfs_delete_ref_head(delayed_refs, head);
4289 spin_unlock(&head->lock);
4290 spin_unlock(&delayed_refs->lock);
4291 mutex_unlock(&head->mutex);
4292
4293 if (pin_bytes)
4294 btrfs_pin_extent(fs_info, head->bytenr,
4295 head->num_bytes, 1);
4296 btrfs_cleanup_ref_head_accounting(fs_info, delayed_refs, head);
4297 btrfs_put_delayed_ref_head(head);
4298 cond_resched();
4299 spin_lock(&delayed_refs->lock);
4300 }
4301
4302 spin_unlock(&delayed_refs->lock);
4303
4304 return ret;
4305}
4306
4307static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
4308{
4309 struct btrfs_inode *btrfs_inode;
4310 struct list_head splice;
4311
4312 INIT_LIST_HEAD(&splice);
4313
4314 spin_lock(&root->delalloc_lock);
4315 list_splice_init(&root->delalloc_inodes, &splice);
4316
4317 while (!list_empty(&splice)) {
4318 struct inode *inode = NULL;
4319 btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
4320 delalloc_inodes);
4321 __btrfs_del_delalloc_inode(root, btrfs_inode);
4322 spin_unlock(&root->delalloc_lock);
4323
4324 /*
4325 * Make sure we get a live inode and that it'll not disappear
4326 * meanwhile.
4327 */
4328 inode = igrab(&btrfs_inode->vfs_inode);
4329 if (inode) {
4330 invalidate_inode_pages2(inode->i_mapping);
4331 iput(inode);
4332 }
4333 spin_lock(&root->delalloc_lock);
4334 }
4335 spin_unlock(&root->delalloc_lock);
4336}
4337
4338static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
4339{
4340 struct btrfs_root *root;
4341 struct list_head splice;
4342
4343 INIT_LIST_HEAD(&splice);
4344
4345 spin_lock(&fs_info->delalloc_root_lock);
4346 list_splice_init(&fs_info->delalloc_roots, &splice);
4347 while (!list_empty(&splice)) {
4348 root = list_first_entry(&splice, struct btrfs_root,
4349 delalloc_root);
4350 root = btrfs_grab_fs_root(root);
4351 BUG_ON(!root);
4352 spin_unlock(&fs_info->delalloc_root_lock);
4353
4354 btrfs_destroy_delalloc_inodes(root);
4355 btrfs_put_fs_root(root);
4356
4357 spin_lock(&fs_info->delalloc_root_lock);
4358 }
4359 spin_unlock(&fs_info->delalloc_root_lock);
4360}
4361
4362static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
4363 struct extent_io_tree *dirty_pages,
4364 int mark)
4365{
4366 int ret;
4367 struct extent_buffer *eb;
4368 u64 start = 0;
4369 u64 end;
4370
4371 while (1) {
4372 ret = find_first_extent_bit(dirty_pages, start, &start, &end,
4373 mark, NULL);
4374 if (ret)
4375 break;
4376
4377 clear_extent_bits(dirty_pages, start, end, mark);
4378 while (start <= end) {
4379 eb = find_extent_buffer(fs_info, start);
4380 start += fs_info->nodesize;
4381 if (!eb)
4382 continue;
4383 wait_on_extent_buffer_writeback(eb);
4384
4385 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
4386 &eb->bflags))
4387 clear_extent_buffer_dirty(eb);
4388 free_extent_buffer_stale(eb);
4389 }
4390 }
4391
4392 return ret;
4393}
4394
4395static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
4396 struct extent_io_tree *pinned_extents)
4397{
4398 struct extent_io_tree *unpin;
4399 u64 start;
4400 u64 end;
4401 int ret;
4402 bool loop = true;
4403
4404 unpin = pinned_extents;
4405again:
4406 while (1) {
4407 struct extent_state *cached_state = NULL;
4408
4409 /*
4410 * The btrfs_finish_extent_commit() may get the same range as
4411 * ours between find_first_extent_bit and clear_extent_dirty.
4412 * Hence, hold the unused_bg_unpin_mutex to avoid double unpin
4413 * the same extent range.
4414 */
4415 mutex_lock(&fs_info->unused_bg_unpin_mutex);
4416 ret = find_first_extent_bit(unpin, 0, &start, &end,
4417 EXTENT_DIRTY, &cached_state);
4418 if (ret) {
4419 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
4420 break;
4421 }
4422
4423 clear_extent_dirty(unpin, start, end, &cached_state);
4424 free_extent_state(cached_state);
4425 btrfs_error_unpin_extent_range(fs_info, start, end);
4426 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
4427 cond_resched();
4428 }
4429
4430 if (loop) {
4431 if (unpin == &fs_info->freed_extents[0])
4432 unpin = &fs_info->freed_extents[1];
4433 else
4434 unpin = &fs_info->freed_extents[0];
4435 loop = false;
4436 goto again;
4437 }
4438
4439 return 0;
4440}
4441
4442static void btrfs_cleanup_bg_io(struct btrfs_block_group_cache *cache)
4443{
4444 struct inode *inode;
4445
4446 inode = cache->io_ctl.inode;
4447 if (inode) {
4448 invalidate_inode_pages2(inode->i_mapping);
4449 BTRFS_I(inode)->generation = 0;
4450 cache->io_ctl.inode = NULL;
4451 iput(inode);
4452 }
4453 btrfs_put_block_group(cache);
4454}
4455
4456void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
4457 struct btrfs_fs_info *fs_info)
4458{
4459 struct btrfs_block_group_cache *cache;
4460
4461 spin_lock(&cur_trans->dirty_bgs_lock);
4462 while (!list_empty(&cur_trans->dirty_bgs)) {
4463 cache = list_first_entry(&cur_trans->dirty_bgs,
4464 struct btrfs_block_group_cache,
4465 dirty_list);
4466
4467 if (!list_empty(&cache->io_list)) {
4468 spin_unlock(&cur_trans->dirty_bgs_lock);
4469 list_del_init(&cache->io_list);
4470 btrfs_cleanup_bg_io(cache);
4471 spin_lock(&cur_trans->dirty_bgs_lock);
4472 }
4473
4474 list_del_init(&cache->dirty_list);
4475 spin_lock(&cache->lock);
4476 cache->disk_cache_state = BTRFS_DC_ERROR;
4477 spin_unlock(&cache->lock);
4478
4479 spin_unlock(&cur_trans->dirty_bgs_lock);
4480 btrfs_put_block_group(cache);
4481 btrfs_delayed_refs_rsv_release(fs_info, 1);
4482 spin_lock(&cur_trans->dirty_bgs_lock);
4483 }
4484 spin_unlock(&cur_trans->dirty_bgs_lock);
4485
4486 /*
4487 * Refer to the definition of io_bgs member for details why it's safe
4488 * to use it without any locking
4489 */
4490 while (!list_empty(&cur_trans->io_bgs)) {
4491 cache = list_first_entry(&cur_trans->io_bgs,
4492 struct btrfs_block_group_cache,
4493 io_list);
4494
4495 list_del_init(&cache->io_list);
4496 spin_lock(&cache->lock);
4497 cache->disk_cache_state = BTRFS_DC_ERROR;
4498 spin_unlock(&cache->lock);
4499 btrfs_cleanup_bg_io(cache);
4500 }
4501}
4502
4503void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
4504 struct btrfs_fs_info *fs_info)
4505{
4506 struct btrfs_device *dev, *tmp;
4507
4508 btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
4509 ASSERT(list_empty(&cur_trans->dirty_bgs));
4510 ASSERT(list_empty(&cur_trans->io_bgs));
4511
4512 list_for_each_entry_safe(dev, tmp, &cur_trans->dev_update_list,
4513 post_commit_list) {
4514 list_del_init(&dev->post_commit_list);
4515 }
4516
4517 btrfs_destroy_delayed_refs(cur_trans, fs_info);
4518
4519 cur_trans->state = TRANS_STATE_COMMIT_START;
4520 wake_up(&fs_info->transaction_blocked_wait);
4521
4522 cur_trans->state = TRANS_STATE_UNBLOCKED;
4523 wake_up(&fs_info->transaction_wait);
4524
4525 btrfs_destroy_delayed_inodes(fs_info);
4526 btrfs_assert_delayed_root_empty(fs_info);
4527
4528 btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
4529 EXTENT_DIRTY);
4530 btrfs_destroy_pinned_extent(fs_info,
4531 fs_info->pinned_extents);
4532
4533 cur_trans->state =TRANS_STATE_COMPLETED;
4534 wake_up(&cur_trans->commit_wait);
4535}
4536
4537static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
4538{
4539 struct btrfs_transaction *t;
4540
4541 mutex_lock(&fs_info->transaction_kthread_mutex);
4542
4543 spin_lock(&fs_info->trans_lock);
4544 while (!list_empty(&fs_info->trans_list)) {
4545 t = list_first_entry(&fs_info->trans_list,
4546 struct btrfs_transaction, list);
4547 if (t->state >= TRANS_STATE_COMMIT_START) {
4548 refcount_inc(&t->use_count);
4549 spin_unlock(&fs_info->trans_lock);
4550 btrfs_wait_for_commit(fs_info, t->transid);
4551 btrfs_put_transaction(t);
4552 spin_lock(&fs_info->trans_lock);
4553 continue;
4554 }
4555 if (t == fs_info->running_transaction) {
4556 t->state = TRANS_STATE_COMMIT_DOING;
4557 spin_unlock(&fs_info->trans_lock);
4558 /*
4559 * We wait for 0 num_writers since we don't hold a trans
4560 * handle open currently for this transaction.
4561 */
4562 wait_event(t->writer_wait,
4563 atomic_read(&t->num_writers) == 0);
4564 } else {
4565 spin_unlock(&fs_info->trans_lock);
4566 }
4567 btrfs_cleanup_one_transaction(t, fs_info);
4568
4569 spin_lock(&fs_info->trans_lock);
4570 if (t == fs_info->running_transaction)
4571 fs_info->running_transaction = NULL;
4572 list_del_init(&t->list);
4573 spin_unlock(&fs_info->trans_lock);
4574
4575 btrfs_put_transaction(t);
4576 trace_btrfs_transaction_commit(fs_info->tree_root);
4577 spin_lock(&fs_info->trans_lock);
4578 }
4579 spin_unlock(&fs_info->trans_lock);
4580 btrfs_destroy_all_ordered_extents(fs_info);
4581 btrfs_destroy_delayed_inodes(fs_info);
4582 btrfs_assert_delayed_root_empty(fs_info);
4583 btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
4584 btrfs_destroy_all_delalloc_inodes(fs_info);
4585 mutex_unlock(&fs_info->transaction_kthread_mutex);
4586
4587 return 0;
4588}
4589
4590static const struct extent_io_ops btree_extent_io_ops = {
4591 /* mandatory callbacks */
4592 .submit_bio_hook = btree_submit_bio_hook,
4593 .readpage_end_io_hook = btree_readpage_end_io_hook,
4594};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2007 Oracle. All rights reserved.
4 */
5
6#include <linux/fs.h>
7#include <linux/blkdev.h>
8#include <linux/radix-tree.h>
9#include <linux/writeback.h>
10#include <linux/workqueue.h>
11#include <linux/kthread.h>
12#include <linux/slab.h>
13#include <linux/migrate.h>
14#include <linux/ratelimit.h>
15#include <linux/uuid.h>
16#include <linux/semaphore.h>
17#include <linux/error-injection.h>
18#include <linux/crc32c.h>
19#include <linux/sched/mm.h>
20#include <asm/unaligned.h>
21#include <crypto/hash.h>
22#include "ctree.h"
23#include "disk-io.h"
24#include "transaction.h"
25#include "btrfs_inode.h"
26#include "bio.h"
27#include "print-tree.h"
28#include "locking.h"
29#include "tree-log.h"
30#include "free-space-cache.h"
31#include "free-space-tree.h"
32#include "check-integrity.h"
33#include "rcu-string.h"
34#include "dev-replace.h"
35#include "raid56.h"
36#include "sysfs.h"
37#include "qgroup.h"
38#include "compression.h"
39#include "tree-checker.h"
40#include "ref-verify.h"
41#include "block-group.h"
42#include "discard.h"
43#include "space-info.h"
44#include "zoned.h"
45#include "subpage.h"
46#include "fs.h"
47#include "accessors.h"
48#include "extent-tree.h"
49#include "root-tree.h"
50#include "defrag.h"
51#include "uuid-tree.h"
52#include "relocation.h"
53#include "scrub.h"
54#include "super.h"
55
56#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
57 BTRFS_HEADER_FLAG_RELOC |\
58 BTRFS_SUPER_FLAG_ERROR |\
59 BTRFS_SUPER_FLAG_SEEDING |\
60 BTRFS_SUPER_FLAG_METADUMP |\
61 BTRFS_SUPER_FLAG_METADUMP_V2)
62
63static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
64static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
65 struct btrfs_fs_info *fs_info);
66static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
67static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
68 struct extent_io_tree *dirty_pages,
69 int mark);
70static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
71 struct extent_io_tree *pinned_extents);
72static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info);
73static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info);
74
75static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
76{
77 if (fs_info->csum_shash)
78 crypto_free_shash(fs_info->csum_shash);
79}
80
81/*
82 * async submit bios are used to offload expensive checksumming
83 * onto the worker threads. They checksum file and metadata bios
84 * just before they are sent down the IO stack.
85 */
86struct async_submit_bio {
87 struct btrfs_inode *inode;
88 struct bio *bio;
89 enum btrfs_wq_submit_cmd submit_cmd;
90 int mirror_num;
91
92 /* Optional parameter for used by direct io */
93 u64 dio_file_offset;
94 struct btrfs_work work;
95 blk_status_t status;
96};
97
98/*
99 * Compute the csum of a btree block and store the result to provided buffer.
100 */
101static void csum_tree_block(struct extent_buffer *buf, u8 *result)
102{
103 struct btrfs_fs_info *fs_info = buf->fs_info;
104 const int num_pages = num_extent_pages(buf);
105 const int first_page_part = min_t(u32, PAGE_SIZE, fs_info->nodesize);
106 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
107 char *kaddr;
108 int i;
109
110 shash->tfm = fs_info->csum_shash;
111 crypto_shash_init(shash);
112 kaddr = page_address(buf->pages[0]) + offset_in_page(buf->start);
113 crypto_shash_update(shash, kaddr + BTRFS_CSUM_SIZE,
114 first_page_part - BTRFS_CSUM_SIZE);
115
116 for (i = 1; i < num_pages; i++) {
117 kaddr = page_address(buf->pages[i]);
118 crypto_shash_update(shash, kaddr, PAGE_SIZE);
119 }
120 memset(result, 0, BTRFS_CSUM_SIZE);
121 crypto_shash_final(shash, result);
122}
123
124/*
125 * we can't consider a given block up to date unless the transid of the
126 * block matches the transid in the parent node's pointer. This is how we
127 * detect blocks that either didn't get written at all or got written
128 * in the wrong place.
129 */
130static int verify_parent_transid(struct extent_io_tree *io_tree,
131 struct extent_buffer *eb, u64 parent_transid,
132 int atomic)
133{
134 struct extent_state *cached_state = NULL;
135 int ret;
136
137 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
138 return 0;
139
140 if (atomic)
141 return -EAGAIN;
142
143 lock_extent(io_tree, eb->start, eb->start + eb->len - 1, &cached_state);
144 if (extent_buffer_uptodate(eb) &&
145 btrfs_header_generation(eb) == parent_transid) {
146 ret = 0;
147 goto out;
148 }
149 btrfs_err_rl(eb->fs_info,
150"parent transid verify failed on logical %llu mirror %u wanted %llu found %llu",
151 eb->start, eb->read_mirror,
152 parent_transid, btrfs_header_generation(eb));
153 ret = 1;
154 clear_extent_buffer_uptodate(eb);
155out:
156 unlock_extent(io_tree, eb->start, eb->start + eb->len - 1,
157 &cached_state);
158 return ret;
159}
160
161static bool btrfs_supported_super_csum(u16 csum_type)
162{
163 switch (csum_type) {
164 case BTRFS_CSUM_TYPE_CRC32:
165 case BTRFS_CSUM_TYPE_XXHASH:
166 case BTRFS_CSUM_TYPE_SHA256:
167 case BTRFS_CSUM_TYPE_BLAKE2:
168 return true;
169 default:
170 return false;
171 }
172}
173
174/*
175 * Return 0 if the superblock checksum type matches the checksum value of that
176 * algorithm. Pass the raw disk superblock data.
177 */
178int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
179 const struct btrfs_super_block *disk_sb)
180{
181 char result[BTRFS_CSUM_SIZE];
182 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
183
184 shash->tfm = fs_info->csum_shash;
185
186 /*
187 * The super_block structure does not span the whole
188 * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space is
189 * filled with zeros and is included in the checksum.
190 */
191 crypto_shash_digest(shash, (const u8 *)disk_sb + BTRFS_CSUM_SIZE,
192 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, result);
193
194 if (memcmp(disk_sb->csum, result, fs_info->csum_size))
195 return 1;
196
197 return 0;
198}
199
200int btrfs_verify_level_key(struct extent_buffer *eb, int level,
201 struct btrfs_key *first_key, u64 parent_transid)
202{
203 struct btrfs_fs_info *fs_info = eb->fs_info;
204 int found_level;
205 struct btrfs_key found_key;
206 int ret;
207
208 found_level = btrfs_header_level(eb);
209 if (found_level != level) {
210 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
211 KERN_ERR "BTRFS: tree level check failed\n");
212 btrfs_err(fs_info,
213"tree level mismatch detected, bytenr=%llu level expected=%u has=%u",
214 eb->start, level, found_level);
215 return -EIO;
216 }
217
218 if (!first_key)
219 return 0;
220
221 /*
222 * For live tree block (new tree blocks in current transaction),
223 * we need proper lock context to avoid race, which is impossible here.
224 * So we only checks tree blocks which is read from disk, whose
225 * generation <= fs_info->last_trans_committed.
226 */
227 if (btrfs_header_generation(eb) > fs_info->last_trans_committed)
228 return 0;
229
230 /* We have @first_key, so this @eb must have at least one item */
231 if (btrfs_header_nritems(eb) == 0) {
232 btrfs_err(fs_info,
233 "invalid tree nritems, bytenr=%llu nritems=0 expect >0",
234 eb->start);
235 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
236 return -EUCLEAN;
237 }
238
239 if (found_level)
240 btrfs_node_key_to_cpu(eb, &found_key, 0);
241 else
242 btrfs_item_key_to_cpu(eb, &found_key, 0);
243 ret = btrfs_comp_cpu_keys(first_key, &found_key);
244
245 if (ret) {
246 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
247 KERN_ERR "BTRFS: tree first key check failed\n");
248 btrfs_err(fs_info,
249"tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
250 eb->start, parent_transid, first_key->objectid,
251 first_key->type, first_key->offset,
252 found_key.objectid, found_key.type,
253 found_key.offset);
254 }
255 return ret;
256}
257
258static int btrfs_repair_eb_io_failure(const struct extent_buffer *eb,
259 int mirror_num)
260{
261 struct btrfs_fs_info *fs_info = eb->fs_info;
262 u64 start = eb->start;
263 int i, num_pages = num_extent_pages(eb);
264 int ret = 0;
265
266 if (sb_rdonly(fs_info->sb))
267 return -EROFS;
268
269 for (i = 0; i < num_pages; i++) {
270 struct page *p = eb->pages[i];
271
272 ret = btrfs_repair_io_failure(fs_info, 0, start, PAGE_SIZE,
273 start, p, start - page_offset(p), mirror_num);
274 if (ret)
275 break;
276 start += PAGE_SIZE;
277 }
278
279 return ret;
280}
281
282/*
283 * helper to read a given tree block, doing retries as required when
284 * the checksums don't match and we have alternate mirrors to try.
285 *
286 * @check: expected tree parentness check, see the comments of the
287 * structure for details.
288 */
289int btrfs_read_extent_buffer(struct extent_buffer *eb,
290 struct btrfs_tree_parent_check *check)
291{
292 struct btrfs_fs_info *fs_info = eb->fs_info;
293 int failed = 0;
294 int ret;
295 int num_copies = 0;
296 int mirror_num = 0;
297 int failed_mirror = 0;
298
299 ASSERT(check);
300
301 while (1) {
302 clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
303 ret = read_extent_buffer_pages(eb, WAIT_COMPLETE, mirror_num, check);
304 if (!ret)
305 break;
306
307 num_copies = btrfs_num_copies(fs_info,
308 eb->start, eb->len);
309 if (num_copies == 1)
310 break;
311
312 if (!failed_mirror) {
313 failed = 1;
314 failed_mirror = eb->read_mirror;
315 }
316
317 mirror_num++;
318 if (mirror_num == failed_mirror)
319 mirror_num++;
320
321 if (mirror_num > num_copies)
322 break;
323 }
324
325 if (failed && !ret && failed_mirror)
326 btrfs_repair_eb_io_failure(eb, failed_mirror);
327
328 return ret;
329}
330
331static int csum_one_extent_buffer(struct extent_buffer *eb)
332{
333 struct btrfs_fs_info *fs_info = eb->fs_info;
334 u8 result[BTRFS_CSUM_SIZE];
335 int ret;
336
337 ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
338 offsetof(struct btrfs_header, fsid),
339 BTRFS_FSID_SIZE) == 0);
340 csum_tree_block(eb, result);
341
342 if (btrfs_header_level(eb))
343 ret = btrfs_check_node(eb);
344 else
345 ret = btrfs_check_leaf_full(eb);
346
347 if (ret < 0)
348 goto error;
349
350 /*
351 * Also check the generation, the eb reached here must be newer than
352 * last committed. Or something seriously wrong happened.
353 */
354 if (unlikely(btrfs_header_generation(eb) <= fs_info->last_trans_committed)) {
355 ret = -EUCLEAN;
356 btrfs_err(fs_info,
357 "block=%llu bad generation, have %llu expect > %llu",
358 eb->start, btrfs_header_generation(eb),
359 fs_info->last_trans_committed);
360 goto error;
361 }
362 write_extent_buffer(eb, result, 0, fs_info->csum_size);
363
364 return 0;
365
366error:
367 btrfs_print_tree(eb, 0);
368 btrfs_err(fs_info, "block=%llu write time tree block corruption detected",
369 eb->start);
370 /*
371 * Be noisy if this is an extent buffer from a log tree. We don't abort
372 * a transaction in case there's a bad log tree extent buffer, we just
373 * fallback to a transaction commit. Still we want to know when there is
374 * a bad log tree extent buffer, as that may signal a bug somewhere.
375 */
376 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG) ||
377 btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID);
378 return ret;
379}
380
381/* Checksum all dirty extent buffers in one bio_vec */
382static int csum_dirty_subpage_buffers(struct btrfs_fs_info *fs_info,
383 struct bio_vec *bvec)
384{
385 struct page *page = bvec->bv_page;
386 u64 bvec_start = page_offset(page) + bvec->bv_offset;
387 u64 cur;
388 int ret = 0;
389
390 for (cur = bvec_start; cur < bvec_start + bvec->bv_len;
391 cur += fs_info->nodesize) {
392 struct extent_buffer *eb;
393 bool uptodate;
394
395 eb = find_extent_buffer(fs_info, cur);
396 uptodate = btrfs_subpage_test_uptodate(fs_info, page, cur,
397 fs_info->nodesize);
398
399 /* A dirty eb shouldn't disappear from buffer_radix */
400 if (WARN_ON(!eb))
401 return -EUCLEAN;
402
403 if (WARN_ON(cur != btrfs_header_bytenr(eb))) {
404 free_extent_buffer(eb);
405 return -EUCLEAN;
406 }
407 if (WARN_ON(!uptodate)) {
408 free_extent_buffer(eb);
409 return -EUCLEAN;
410 }
411
412 ret = csum_one_extent_buffer(eb);
413 free_extent_buffer(eb);
414 if (ret < 0)
415 return ret;
416 }
417 return ret;
418}
419
420/*
421 * Checksum a dirty tree block before IO. This has extra checks to make sure
422 * we only fill in the checksum field in the first page of a multi-page block.
423 * For subpage extent buffers we need bvec to also read the offset in the page.
424 */
425static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct bio_vec *bvec)
426{
427 struct page *page = bvec->bv_page;
428 u64 start = page_offset(page);
429 u64 found_start;
430 struct extent_buffer *eb;
431
432 if (fs_info->nodesize < PAGE_SIZE)
433 return csum_dirty_subpage_buffers(fs_info, bvec);
434
435 eb = (struct extent_buffer *)page->private;
436 if (page != eb->pages[0])
437 return 0;
438
439 found_start = btrfs_header_bytenr(eb);
440
441 if (test_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags)) {
442 WARN_ON(found_start != 0);
443 return 0;
444 }
445
446 /*
447 * Please do not consolidate these warnings into a single if.
448 * It is useful to know what went wrong.
449 */
450 if (WARN_ON(found_start != start))
451 return -EUCLEAN;
452 if (WARN_ON(!PageUptodate(page)))
453 return -EUCLEAN;
454
455 return csum_one_extent_buffer(eb);
456}
457
458static int check_tree_block_fsid(struct extent_buffer *eb)
459{
460 struct btrfs_fs_info *fs_info = eb->fs_info;
461 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices, *seed_devs;
462 u8 fsid[BTRFS_FSID_SIZE];
463 u8 *metadata_uuid;
464
465 read_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
466 BTRFS_FSID_SIZE);
467 /*
468 * Checking the incompat flag is only valid for the current fs. For
469 * seed devices it's forbidden to have their uuid changed so reading
470 * ->fsid in this case is fine
471 */
472 if (btrfs_fs_incompat(fs_info, METADATA_UUID))
473 metadata_uuid = fs_devices->metadata_uuid;
474 else
475 metadata_uuid = fs_devices->fsid;
476
477 if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE))
478 return 0;
479
480 list_for_each_entry(seed_devs, &fs_devices->seed_list, seed_list)
481 if (!memcmp(fsid, seed_devs->fsid, BTRFS_FSID_SIZE))
482 return 0;
483
484 return 1;
485}
486
487/* Do basic extent buffer checks at read time */
488static int validate_extent_buffer(struct extent_buffer *eb,
489 struct btrfs_tree_parent_check *check)
490{
491 struct btrfs_fs_info *fs_info = eb->fs_info;
492 u64 found_start;
493 const u32 csum_size = fs_info->csum_size;
494 u8 found_level;
495 u8 result[BTRFS_CSUM_SIZE];
496 const u8 *header_csum;
497 int ret = 0;
498
499 ASSERT(check);
500
501 found_start = btrfs_header_bytenr(eb);
502 if (found_start != eb->start) {
503 btrfs_err_rl(fs_info,
504 "bad tree block start, mirror %u want %llu have %llu",
505 eb->read_mirror, eb->start, found_start);
506 ret = -EIO;
507 goto out;
508 }
509 if (check_tree_block_fsid(eb)) {
510 btrfs_err_rl(fs_info, "bad fsid on logical %llu mirror %u",
511 eb->start, eb->read_mirror);
512 ret = -EIO;
513 goto out;
514 }
515 found_level = btrfs_header_level(eb);
516 if (found_level >= BTRFS_MAX_LEVEL) {
517 btrfs_err(fs_info,
518 "bad tree block level, mirror %u level %d on logical %llu",
519 eb->read_mirror, btrfs_header_level(eb), eb->start);
520 ret = -EIO;
521 goto out;
522 }
523
524 csum_tree_block(eb, result);
525 header_csum = page_address(eb->pages[0]) +
526 get_eb_offset_in_page(eb, offsetof(struct btrfs_header, csum));
527
528 if (memcmp(result, header_csum, csum_size) != 0) {
529 btrfs_warn_rl(fs_info,
530"checksum verify failed on logical %llu mirror %u wanted " CSUM_FMT " found " CSUM_FMT " level %d",
531 eb->start, eb->read_mirror,
532 CSUM_FMT_VALUE(csum_size, header_csum),
533 CSUM_FMT_VALUE(csum_size, result),
534 btrfs_header_level(eb));
535 ret = -EUCLEAN;
536 goto out;
537 }
538
539 if (found_level != check->level) {
540 btrfs_err(fs_info,
541 "level verify failed on logical %llu mirror %u wanted %u found %u",
542 eb->start, eb->read_mirror, check->level, found_level);
543 ret = -EIO;
544 goto out;
545 }
546 if (unlikely(check->transid &&
547 btrfs_header_generation(eb) != check->transid)) {
548 btrfs_err_rl(eb->fs_info,
549"parent transid verify failed on logical %llu mirror %u wanted %llu found %llu",
550 eb->start, eb->read_mirror, check->transid,
551 btrfs_header_generation(eb));
552 ret = -EIO;
553 goto out;
554 }
555 if (check->has_first_key) {
556 struct btrfs_key *expect_key = &check->first_key;
557 struct btrfs_key found_key;
558
559 if (found_level)
560 btrfs_node_key_to_cpu(eb, &found_key, 0);
561 else
562 btrfs_item_key_to_cpu(eb, &found_key, 0);
563 if (unlikely(btrfs_comp_cpu_keys(expect_key, &found_key))) {
564 btrfs_err(fs_info,
565"tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
566 eb->start, check->transid,
567 expect_key->objectid,
568 expect_key->type, expect_key->offset,
569 found_key.objectid, found_key.type,
570 found_key.offset);
571 ret = -EUCLEAN;
572 goto out;
573 }
574 }
575 if (check->owner_root) {
576 ret = btrfs_check_eb_owner(eb, check->owner_root);
577 if (ret < 0)
578 goto out;
579 }
580
581 /*
582 * If this is a leaf block and it is corrupt, set the corrupt bit so
583 * that we don't try and read the other copies of this block, just
584 * return -EIO.
585 */
586 if (found_level == 0 && btrfs_check_leaf_full(eb)) {
587 set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
588 ret = -EIO;
589 }
590
591 if (found_level > 0 && btrfs_check_node(eb))
592 ret = -EIO;
593
594 if (!ret)
595 set_extent_buffer_uptodate(eb);
596 else
597 btrfs_err(fs_info,
598 "read time tree block corruption detected on logical %llu mirror %u",
599 eb->start, eb->read_mirror);
600out:
601 return ret;
602}
603
604static int validate_subpage_buffer(struct page *page, u64 start, u64 end,
605 int mirror, struct btrfs_tree_parent_check *check)
606{
607 struct btrfs_fs_info *fs_info = btrfs_sb(page->mapping->host->i_sb);
608 struct extent_buffer *eb;
609 bool reads_done;
610 int ret = 0;
611
612 ASSERT(check);
613
614 /*
615 * We don't allow bio merge for subpage metadata read, so we should
616 * only get one eb for each endio hook.
617 */
618 ASSERT(end == start + fs_info->nodesize - 1);
619 ASSERT(PagePrivate(page));
620
621 eb = find_extent_buffer(fs_info, start);
622 /*
623 * When we are reading one tree block, eb must have been inserted into
624 * the radix tree. If not, something is wrong.
625 */
626 ASSERT(eb);
627
628 reads_done = atomic_dec_and_test(&eb->io_pages);
629 /* Subpage read must finish in page read */
630 ASSERT(reads_done);
631
632 eb->read_mirror = mirror;
633 if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
634 ret = -EIO;
635 goto err;
636 }
637 ret = validate_extent_buffer(eb, check);
638 if (ret < 0)
639 goto err;
640
641 set_extent_buffer_uptodate(eb);
642
643 free_extent_buffer(eb);
644 return ret;
645err:
646 /*
647 * end_bio_extent_readpage decrements io_pages in case of error,
648 * make sure it has something to decrement.
649 */
650 atomic_inc(&eb->io_pages);
651 clear_extent_buffer_uptodate(eb);
652 free_extent_buffer(eb);
653 return ret;
654}
655
656int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio,
657 struct page *page, u64 start, u64 end,
658 int mirror)
659{
660 struct extent_buffer *eb;
661 int ret = 0;
662 int reads_done;
663
664 ASSERT(page->private);
665
666 if (btrfs_sb(page->mapping->host->i_sb)->nodesize < PAGE_SIZE)
667 return validate_subpage_buffer(page, start, end, mirror,
668 &bbio->parent_check);
669
670 eb = (struct extent_buffer *)page->private;
671
672 /*
673 * The pending IO might have been the only thing that kept this buffer
674 * in memory. Make sure we have a ref for all this other checks
675 */
676 atomic_inc(&eb->refs);
677
678 reads_done = atomic_dec_and_test(&eb->io_pages);
679 if (!reads_done)
680 goto err;
681
682 eb->read_mirror = mirror;
683 if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
684 ret = -EIO;
685 goto err;
686 }
687 ret = validate_extent_buffer(eb, &bbio->parent_check);
688err:
689 if (ret) {
690 /*
691 * our io error hook is going to dec the io pages
692 * again, we have to make sure it has something
693 * to decrement
694 */
695 atomic_inc(&eb->io_pages);
696 clear_extent_buffer_uptodate(eb);
697 }
698 free_extent_buffer(eb);
699
700 return ret;
701}
702
703static void run_one_async_start(struct btrfs_work *work)
704{
705 struct async_submit_bio *async;
706 blk_status_t ret;
707
708 async = container_of(work, struct async_submit_bio, work);
709 switch (async->submit_cmd) {
710 case WQ_SUBMIT_METADATA:
711 ret = btree_submit_bio_start(async->bio);
712 break;
713 case WQ_SUBMIT_DATA:
714 ret = btrfs_submit_bio_start(async->inode, async->bio);
715 break;
716 case WQ_SUBMIT_DATA_DIO:
717 ret = btrfs_submit_bio_start_direct_io(async->inode,
718 async->bio, async->dio_file_offset);
719 break;
720 }
721 if (ret)
722 async->status = ret;
723}
724
725/*
726 * In order to insert checksums into the metadata in large chunks, we wait
727 * until bio submission time. All the pages in the bio are checksummed and
728 * sums are attached onto the ordered extent record.
729 *
730 * At IO completion time the csums attached on the ordered extent record are
731 * inserted into the tree.
732 */
733static void run_one_async_done(struct btrfs_work *work)
734{
735 struct async_submit_bio *async =
736 container_of(work, struct async_submit_bio, work);
737 struct btrfs_inode *inode = async->inode;
738 struct btrfs_bio *bbio = btrfs_bio(async->bio);
739
740 /* If an error occurred we just want to clean up the bio and move on */
741 if (async->status) {
742 btrfs_bio_end_io(bbio, async->status);
743 return;
744 }
745
746 /*
747 * All of the bios that pass through here are from async helpers.
748 * Use REQ_CGROUP_PUNT to issue them from the owning cgroup's context.
749 * This changes nothing when cgroups aren't in use.
750 */
751 async->bio->bi_opf |= REQ_CGROUP_PUNT;
752 btrfs_submit_bio(inode->root->fs_info, async->bio, async->mirror_num);
753}
754
755static void run_one_async_free(struct btrfs_work *work)
756{
757 struct async_submit_bio *async;
758
759 async = container_of(work, struct async_submit_bio, work);
760 kfree(async);
761}
762
763/*
764 * Submit bio to an async queue.
765 *
766 * Retrun:
767 * - true if the work has been succesfuly submitted
768 * - false in case of error
769 */
770bool btrfs_wq_submit_bio(struct btrfs_inode *inode, struct bio *bio, int mirror_num,
771 u64 dio_file_offset, enum btrfs_wq_submit_cmd cmd)
772{
773 struct btrfs_fs_info *fs_info = inode->root->fs_info;
774 struct async_submit_bio *async;
775
776 async = kmalloc(sizeof(*async), GFP_NOFS);
777 if (!async)
778 return false;
779
780 async->inode = inode;
781 async->bio = bio;
782 async->mirror_num = mirror_num;
783 async->submit_cmd = cmd;
784
785 btrfs_init_work(&async->work, run_one_async_start, run_one_async_done,
786 run_one_async_free);
787
788 async->dio_file_offset = dio_file_offset;
789
790 async->status = 0;
791
792 if (op_is_sync(bio->bi_opf))
793 btrfs_queue_work(fs_info->hipri_workers, &async->work);
794 else
795 btrfs_queue_work(fs_info->workers, &async->work);
796 return true;
797}
798
799static blk_status_t btree_csum_one_bio(struct bio *bio)
800{
801 struct bio_vec *bvec;
802 struct btrfs_root *root;
803 int ret = 0;
804 struct bvec_iter_all iter_all;
805
806 ASSERT(!bio_flagged(bio, BIO_CLONED));
807 bio_for_each_segment_all(bvec, bio, iter_all) {
808 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
809 ret = csum_dirty_buffer(root->fs_info, bvec);
810 if (ret)
811 break;
812 }
813
814 return errno_to_blk_status(ret);
815}
816
817blk_status_t btree_submit_bio_start(struct bio *bio)
818{
819 /*
820 * when we're called for a write, we're already in the async
821 * submission context. Just jump into btrfs_submit_bio.
822 */
823 return btree_csum_one_bio(bio);
824}
825
826static bool should_async_write(struct btrfs_fs_info *fs_info,
827 struct btrfs_inode *bi)
828{
829 if (btrfs_is_zoned(fs_info))
830 return false;
831 if (atomic_read(&bi->sync_writers))
832 return false;
833 if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags))
834 return false;
835 return true;
836}
837
838void btrfs_submit_metadata_bio(struct btrfs_inode *inode, struct bio *bio, int mirror_num)
839{
840 struct btrfs_fs_info *fs_info = inode->root->fs_info;
841 struct btrfs_bio *bbio = btrfs_bio(bio);
842 blk_status_t ret;
843
844 bio->bi_opf |= REQ_META;
845 bbio->is_metadata = 1;
846
847 if (btrfs_op(bio) != BTRFS_MAP_WRITE) {
848 btrfs_submit_bio(fs_info, bio, mirror_num);
849 return;
850 }
851
852 /*
853 * Kthread helpers are used to submit writes so that checksumming can
854 * happen in parallel across all CPUs.
855 */
856 if (should_async_write(fs_info, inode) &&
857 btrfs_wq_submit_bio(inode, bio, mirror_num, 0, WQ_SUBMIT_METADATA))
858 return;
859
860 ret = btree_csum_one_bio(bio);
861 if (ret) {
862 btrfs_bio_end_io(bbio, ret);
863 return;
864 }
865
866 btrfs_submit_bio(fs_info, bio, mirror_num);
867}
868
869#ifdef CONFIG_MIGRATION
870static int btree_migrate_folio(struct address_space *mapping,
871 struct folio *dst, struct folio *src, enum migrate_mode mode)
872{
873 /*
874 * we can't safely write a btree page from here,
875 * we haven't done the locking hook
876 */
877 if (folio_test_dirty(src))
878 return -EAGAIN;
879 /*
880 * Buffers may be managed in a filesystem specific way.
881 * We must have no buffers or drop them.
882 */
883 if (folio_get_private(src) &&
884 !filemap_release_folio(src, GFP_KERNEL))
885 return -EAGAIN;
886 return migrate_folio(mapping, dst, src, mode);
887}
888#else
889#define btree_migrate_folio NULL
890#endif
891
892static int btree_writepages(struct address_space *mapping,
893 struct writeback_control *wbc)
894{
895 struct btrfs_fs_info *fs_info;
896 int ret;
897
898 if (wbc->sync_mode == WB_SYNC_NONE) {
899
900 if (wbc->for_kupdate)
901 return 0;
902
903 fs_info = BTRFS_I(mapping->host)->root->fs_info;
904 /* this is a bit racy, but that's ok */
905 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
906 BTRFS_DIRTY_METADATA_THRESH,
907 fs_info->dirty_metadata_batch);
908 if (ret < 0)
909 return 0;
910 }
911 return btree_write_cache_pages(mapping, wbc);
912}
913
914static bool btree_release_folio(struct folio *folio, gfp_t gfp_flags)
915{
916 if (folio_test_writeback(folio) || folio_test_dirty(folio))
917 return false;
918
919 return try_release_extent_buffer(&folio->page);
920}
921
922static void btree_invalidate_folio(struct folio *folio, size_t offset,
923 size_t length)
924{
925 struct extent_io_tree *tree;
926 tree = &BTRFS_I(folio->mapping->host)->io_tree;
927 extent_invalidate_folio(tree, folio, offset);
928 btree_release_folio(folio, GFP_NOFS);
929 if (folio_get_private(folio)) {
930 btrfs_warn(BTRFS_I(folio->mapping->host)->root->fs_info,
931 "folio private not zero on folio %llu",
932 (unsigned long long)folio_pos(folio));
933 folio_detach_private(folio);
934 }
935}
936
937#ifdef DEBUG
938static bool btree_dirty_folio(struct address_space *mapping,
939 struct folio *folio)
940{
941 struct btrfs_fs_info *fs_info = btrfs_sb(mapping->host->i_sb);
942 struct btrfs_subpage *subpage;
943 struct extent_buffer *eb;
944 int cur_bit = 0;
945 u64 page_start = folio_pos(folio);
946
947 if (fs_info->sectorsize == PAGE_SIZE) {
948 eb = folio_get_private(folio);
949 BUG_ON(!eb);
950 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
951 BUG_ON(!atomic_read(&eb->refs));
952 btrfs_assert_tree_write_locked(eb);
953 return filemap_dirty_folio(mapping, folio);
954 }
955 subpage = folio_get_private(folio);
956
957 ASSERT(subpage->dirty_bitmap);
958 while (cur_bit < BTRFS_SUBPAGE_BITMAP_SIZE) {
959 unsigned long flags;
960 u64 cur;
961 u16 tmp = (1 << cur_bit);
962
963 spin_lock_irqsave(&subpage->lock, flags);
964 if (!(tmp & subpage->dirty_bitmap)) {
965 spin_unlock_irqrestore(&subpage->lock, flags);
966 cur_bit++;
967 continue;
968 }
969 spin_unlock_irqrestore(&subpage->lock, flags);
970 cur = page_start + cur_bit * fs_info->sectorsize;
971
972 eb = find_extent_buffer(fs_info, cur);
973 ASSERT(eb);
974 ASSERT(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
975 ASSERT(atomic_read(&eb->refs));
976 btrfs_assert_tree_write_locked(eb);
977 free_extent_buffer(eb);
978
979 cur_bit += (fs_info->nodesize >> fs_info->sectorsize_bits);
980 }
981 return filemap_dirty_folio(mapping, folio);
982}
983#else
984#define btree_dirty_folio filemap_dirty_folio
985#endif
986
987static const struct address_space_operations btree_aops = {
988 .writepages = btree_writepages,
989 .release_folio = btree_release_folio,
990 .invalidate_folio = btree_invalidate_folio,
991 .migrate_folio = btree_migrate_folio,
992 .dirty_folio = btree_dirty_folio,
993};
994
995struct extent_buffer *btrfs_find_create_tree_block(
996 struct btrfs_fs_info *fs_info,
997 u64 bytenr, u64 owner_root,
998 int level)
999{
1000 if (btrfs_is_testing(fs_info))
1001 return alloc_test_extent_buffer(fs_info, bytenr);
1002 return alloc_extent_buffer(fs_info, bytenr, owner_root, level);
1003}
1004
1005/*
1006 * Read tree block at logical address @bytenr and do variant basic but critical
1007 * verification.
1008 *
1009 * @check: expected tree parentness check, see comments of the
1010 * structure for details.
1011 */
1012struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
1013 struct btrfs_tree_parent_check *check)
1014{
1015 struct extent_buffer *buf = NULL;
1016 int ret;
1017
1018 ASSERT(check);
1019
1020 buf = btrfs_find_create_tree_block(fs_info, bytenr, check->owner_root,
1021 check->level);
1022 if (IS_ERR(buf))
1023 return buf;
1024
1025 ret = btrfs_read_extent_buffer(buf, check);
1026 if (ret) {
1027 free_extent_buffer_stale(buf);
1028 return ERR_PTR(ret);
1029 }
1030 if (btrfs_check_eb_owner(buf, check->owner_root)) {
1031 free_extent_buffer_stale(buf);
1032 return ERR_PTR(-EUCLEAN);
1033 }
1034 return buf;
1035
1036}
1037
1038void btrfs_clean_tree_block(struct extent_buffer *buf)
1039{
1040 struct btrfs_fs_info *fs_info = buf->fs_info;
1041 if (btrfs_header_generation(buf) ==
1042 fs_info->running_transaction->transid) {
1043 btrfs_assert_tree_write_locked(buf);
1044
1045 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
1046 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
1047 -buf->len,
1048 fs_info->dirty_metadata_batch);
1049 clear_extent_buffer_dirty(buf);
1050 }
1051 }
1052}
1053
1054static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
1055 u64 objectid)
1056{
1057 bool dummy = test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
1058
1059 memset(&root->root_key, 0, sizeof(root->root_key));
1060 memset(&root->root_item, 0, sizeof(root->root_item));
1061 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
1062 root->fs_info = fs_info;
1063 root->root_key.objectid = objectid;
1064 root->node = NULL;
1065 root->commit_root = NULL;
1066 root->state = 0;
1067 RB_CLEAR_NODE(&root->rb_node);
1068
1069 root->last_trans = 0;
1070 root->free_objectid = 0;
1071 root->nr_delalloc_inodes = 0;
1072 root->nr_ordered_extents = 0;
1073 root->inode_tree = RB_ROOT;
1074 INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
1075
1076 btrfs_init_root_block_rsv(root);
1077
1078 INIT_LIST_HEAD(&root->dirty_list);
1079 INIT_LIST_HEAD(&root->root_list);
1080 INIT_LIST_HEAD(&root->delalloc_inodes);
1081 INIT_LIST_HEAD(&root->delalloc_root);
1082 INIT_LIST_HEAD(&root->ordered_extents);
1083 INIT_LIST_HEAD(&root->ordered_root);
1084 INIT_LIST_HEAD(&root->reloc_dirty_list);
1085 INIT_LIST_HEAD(&root->logged_list[0]);
1086 INIT_LIST_HEAD(&root->logged_list[1]);
1087 spin_lock_init(&root->inode_lock);
1088 spin_lock_init(&root->delalloc_lock);
1089 spin_lock_init(&root->ordered_extent_lock);
1090 spin_lock_init(&root->accounting_lock);
1091 spin_lock_init(&root->log_extents_lock[0]);
1092 spin_lock_init(&root->log_extents_lock[1]);
1093 spin_lock_init(&root->qgroup_meta_rsv_lock);
1094 mutex_init(&root->objectid_mutex);
1095 mutex_init(&root->log_mutex);
1096 mutex_init(&root->ordered_extent_mutex);
1097 mutex_init(&root->delalloc_mutex);
1098 init_waitqueue_head(&root->qgroup_flush_wait);
1099 init_waitqueue_head(&root->log_writer_wait);
1100 init_waitqueue_head(&root->log_commit_wait[0]);
1101 init_waitqueue_head(&root->log_commit_wait[1]);
1102 INIT_LIST_HEAD(&root->log_ctxs[0]);
1103 INIT_LIST_HEAD(&root->log_ctxs[1]);
1104 atomic_set(&root->log_commit[0], 0);
1105 atomic_set(&root->log_commit[1], 0);
1106 atomic_set(&root->log_writers, 0);
1107 atomic_set(&root->log_batch, 0);
1108 refcount_set(&root->refs, 1);
1109 atomic_set(&root->snapshot_force_cow, 0);
1110 atomic_set(&root->nr_swapfiles, 0);
1111 root->log_transid = 0;
1112 root->log_transid_committed = -1;
1113 root->last_log_commit = 0;
1114 root->anon_dev = 0;
1115 if (!dummy) {
1116 extent_io_tree_init(fs_info, &root->dirty_log_pages,
1117 IO_TREE_ROOT_DIRTY_LOG_PAGES);
1118 extent_io_tree_init(fs_info, &root->log_csum_range,
1119 IO_TREE_LOG_CSUM_RANGE);
1120 }
1121
1122 spin_lock_init(&root->root_item_lock);
1123 btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks);
1124#ifdef CONFIG_BTRFS_DEBUG
1125 INIT_LIST_HEAD(&root->leak_list);
1126 spin_lock(&fs_info->fs_roots_radix_lock);
1127 list_add_tail(&root->leak_list, &fs_info->allocated_roots);
1128 spin_unlock(&fs_info->fs_roots_radix_lock);
1129#endif
1130}
1131
1132static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
1133 u64 objectid, gfp_t flags)
1134{
1135 struct btrfs_root *root = kzalloc(sizeof(*root), flags);
1136 if (root)
1137 __setup_root(root, fs_info, objectid);
1138 return root;
1139}
1140
1141#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1142/* Should only be used by the testing infrastructure */
1143struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info)
1144{
1145 struct btrfs_root *root;
1146
1147 if (!fs_info)
1148 return ERR_PTR(-EINVAL);
1149
1150 root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID, GFP_KERNEL);
1151 if (!root)
1152 return ERR_PTR(-ENOMEM);
1153
1154 /* We don't use the stripesize in selftest, set it as sectorsize */
1155 root->alloc_bytenr = 0;
1156
1157 return root;
1158}
1159#endif
1160
1161static int global_root_cmp(struct rb_node *a_node, const struct rb_node *b_node)
1162{
1163 const struct btrfs_root *a = rb_entry(a_node, struct btrfs_root, rb_node);
1164 const struct btrfs_root *b = rb_entry(b_node, struct btrfs_root, rb_node);
1165
1166 return btrfs_comp_cpu_keys(&a->root_key, &b->root_key);
1167}
1168
1169static int global_root_key_cmp(const void *k, const struct rb_node *node)
1170{
1171 const struct btrfs_key *key = k;
1172 const struct btrfs_root *root = rb_entry(node, struct btrfs_root, rb_node);
1173
1174 return btrfs_comp_cpu_keys(key, &root->root_key);
1175}
1176
1177int btrfs_global_root_insert(struct btrfs_root *root)
1178{
1179 struct btrfs_fs_info *fs_info = root->fs_info;
1180 struct rb_node *tmp;
1181
1182 write_lock(&fs_info->global_root_lock);
1183 tmp = rb_find_add(&root->rb_node, &fs_info->global_root_tree, global_root_cmp);
1184 write_unlock(&fs_info->global_root_lock);
1185 ASSERT(!tmp);
1186
1187 return tmp ? -EEXIST : 0;
1188}
1189
1190void btrfs_global_root_delete(struct btrfs_root *root)
1191{
1192 struct btrfs_fs_info *fs_info = root->fs_info;
1193
1194 write_lock(&fs_info->global_root_lock);
1195 rb_erase(&root->rb_node, &fs_info->global_root_tree);
1196 write_unlock(&fs_info->global_root_lock);
1197}
1198
1199struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
1200 struct btrfs_key *key)
1201{
1202 struct rb_node *node;
1203 struct btrfs_root *root = NULL;
1204
1205 read_lock(&fs_info->global_root_lock);
1206 node = rb_find(key, &fs_info->global_root_tree, global_root_key_cmp);
1207 if (node)
1208 root = container_of(node, struct btrfs_root, rb_node);
1209 read_unlock(&fs_info->global_root_lock);
1210
1211 return root;
1212}
1213
1214static u64 btrfs_global_root_id(struct btrfs_fs_info *fs_info, u64 bytenr)
1215{
1216 struct btrfs_block_group *block_group;
1217 u64 ret;
1218
1219 if (!btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
1220 return 0;
1221
1222 if (bytenr)
1223 block_group = btrfs_lookup_block_group(fs_info, bytenr);
1224 else
1225 block_group = btrfs_lookup_first_block_group(fs_info, bytenr);
1226 ASSERT(block_group);
1227 if (!block_group)
1228 return 0;
1229 ret = block_group->global_root_id;
1230 btrfs_put_block_group(block_group);
1231
1232 return ret;
1233}
1234
1235struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr)
1236{
1237 struct btrfs_key key = {
1238 .objectid = BTRFS_CSUM_TREE_OBJECTID,
1239 .type = BTRFS_ROOT_ITEM_KEY,
1240 .offset = btrfs_global_root_id(fs_info, bytenr),
1241 };
1242
1243 return btrfs_global_root(fs_info, &key);
1244}
1245
1246struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr)
1247{
1248 struct btrfs_key key = {
1249 .objectid = BTRFS_EXTENT_TREE_OBJECTID,
1250 .type = BTRFS_ROOT_ITEM_KEY,
1251 .offset = btrfs_global_root_id(fs_info, bytenr),
1252 };
1253
1254 return btrfs_global_root(fs_info, &key);
1255}
1256
1257struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info)
1258{
1259 if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE))
1260 return fs_info->block_group_root;
1261 return btrfs_extent_root(fs_info, 0);
1262}
1263
1264struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
1265 u64 objectid)
1266{
1267 struct btrfs_fs_info *fs_info = trans->fs_info;
1268 struct extent_buffer *leaf;
1269 struct btrfs_root *tree_root = fs_info->tree_root;
1270 struct btrfs_root *root;
1271 struct btrfs_key key;
1272 unsigned int nofs_flag;
1273 int ret = 0;
1274
1275 /*
1276 * We're holding a transaction handle, so use a NOFS memory allocation
1277 * context to avoid deadlock if reclaim happens.
1278 */
1279 nofs_flag = memalloc_nofs_save();
1280 root = btrfs_alloc_root(fs_info, objectid, GFP_KERNEL);
1281 memalloc_nofs_restore(nofs_flag);
1282 if (!root)
1283 return ERR_PTR(-ENOMEM);
1284
1285 root->root_key.objectid = objectid;
1286 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1287 root->root_key.offset = 0;
1288
1289 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
1290 BTRFS_NESTING_NORMAL);
1291 if (IS_ERR(leaf)) {
1292 ret = PTR_ERR(leaf);
1293 leaf = NULL;
1294 goto fail;
1295 }
1296
1297 root->node = leaf;
1298 btrfs_mark_buffer_dirty(leaf);
1299
1300 root->commit_root = btrfs_root_node(root);
1301 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
1302
1303 btrfs_set_root_flags(&root->root_item, 0);
1304 btrfs_set_root_limit(&root->root_item, 0);
1305 btrfs_set_root_bytenr(&root->root_item, leaf->start);
1306 btrfs_set_root_generation(&root->root_item, trans->transid);
1307 btrfs_set_root_level(&root->root_item, 0);
1308 btrfs_set_root_refs(&root->root_item, 1);
1309 btrfs_set_root_used(&root->root_item, leaf->len);
1310 btrfs_set_root_last_snapshot(&root->root_item, 0);
1311 btrfs_set_root_dirid(&root->root_item, 0);
1312 if (is_fstree(objectid))
1313 generate_random_guid(root->root_item.uuid);
1314 else
1315 export_guid(root->root_item.uuid, &guid_null);
1316 btrfs_set_root_drop_level(&root->root_item, 0);
1317
1318 btrfs_tree_unlock(leaf);
1319
1320 key.objectid = objectid;
1321 key.type = BTRFS_ROOT_ITEM_KEY;
1322 key.offset = 0;
1323 ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
1324 if (ret)
1325 goto fail;
1326
1327 return root;
1328
1329fail:
1330 btrfs_put_root(root);
1331
1332 return ERR_PTR(ret);
1333}
1334
1335static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1336 struct btrfs_fs_info *fs_info)
1337{
1338 struct btrfs_root *root;
1339
1340 root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID, GFP_NOFS);
1341 if (!root)
1342 return ERR_PTR(-ENOMEM);
1343
1344 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1345 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1346 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
1347
1348 return root;
1349}
1350
1351int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
1352 struct btrfs_root *root)
1353{
1354 struct extent_buffer *leaf;
1355
1356 /*
1357 * DON'T set SHAREABLE bit for log trees.
1358 *
1359 * Log trees are not exposed to user space thus can't be snapshotted,
1360 * and they go away before a real commit is actually done.
1361 *
1362 * They do store pointers to file data extents, and those reference
1363 * counts still get updated (along with back refs to the log tree).
1364 */
1365
1366 leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
1367 NULL, 0, 0, 0, BTRFS_NESTING_NORMAL);
1368 if (IS_ERR(leaf))
1369 return PTR_ERR(leaf);
1370
1371 root->node = leaf;
1372
1373 btrfs_mark_buffer_dirty(root->node);
1374 btrfs_tree_unlock(root->node);
1375
1376 return 0;
1377}
1378
1379int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1380 struct btrfs_fs_info *fs_info)
1381{
1382 struct btrfs_root *log_root;
1383
1384 log_root = alloc_log_tree(trans, fs_info);
1385 if (IS_ERR(log_root))
1386 return PTR_ERR(log_root);
1387
1388 if (!btrfs_is_zoned(fs_info)) {
1389 int ret = btrfs_alloc_log_tree_node(trans, log_root);
1390
1391 if (ret) {
1392 btrfs_put_root(log_root);
1393 return ret;
1394 }
1395 }
1396
1397 WARN_ON(fs_info->log_root_tree);
1398 fs_info->log_root_tree = log_root;
1399 return 0;
1400}
1401
1402int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1403 struct btrfs_root *root)
1404{
1405 struct btrfs_fs_info *fs_info = root->fs_info;
1406 struct btrfs_root *log_root;
1407 struct btrfs_inode_item *inode_item;
1408 int ret;
1409
1410 log_root = alloc_log_tree(trans, fs_info);
1411 if (IS_ERR(log_root))
1412 return PTR_ERR(log_root);
1413
1414 ret = btrfs_alloc_log_tree_node(trans, log_root);
1415 if (ret) {
1416 btrfs_put_root(log_root);
1417 return ret;
1418 }
1419
1420 log_root->last_trans = trans->transid;
1421 log_root->root_key.offset = root->root_key.objectid;
1422
1423 inode_item = &log_root->root_item.inode;
1424 btrfs_set_stack_inode_generation(inode_item, 1);
1425 btrfs_set_stack_inode_size(inode_item, 3);
1426 btrfs_set_stack_inode_nlink(inode_item, 1);
1427 btrfs_set_stack_inode_nbytes(inode_item,
1428 fs_info->nodesize);
1429 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
1430
1431 btrfs_set_root_node(&log_root->root_item, log_root->node);
1432
1433 WARN_ON(root->log_root);
1434 root->log_root = log_root;
1435 root->log_transid = 0;
1436 root->log_transid_committed = -1;
1437 root->last_log_commit = 0;
1438 return 0;
1439}
1440
1441static struct btrfs_root *read_tree_root_path(struct btrfs_root *tree_root,
1442 struct btrfs_path *path,
1443 struct btrfs_key *key)
1444{
1445 struct btrfs_root *root;
1446 struct btrfs_tree_parent_check check = { 0 };
1447 struct btrfs_fs_info *fs_info = tree_root->fs_info;
1448 u64 generation;
1449 int ret;
1450 int level;
1451
1452 root = btrfs_alloc_root(fs_info, key->objectid, GFP_NOFS);
1453 if (!root)
1454 return ERR_PTR(-ENOMEM);
1455
1456 ret = btrfs_find_root(tree_root, key, path,
1457 &root->root_item, &root->root_key);
1458 if (ret) {
1459 if (ret > 0)
1460 ret = -ENOENT;
1461 goto fail;
1462 }
1463
1464 generation = btrfs_root_generation(&root->root_item);
1465 level = btrfs_root_level(&root->root_item);
1466 check.level = level;
1467 check.transid = generation;
1468 check.owner_root = key->objectid;
1469 root->node = read_tree_block(fs_info, btrfs_root_bytenr(&root->root_item),
1470 &check);
1471 if (IS_ERR(root->node)) {
1472 ret = PTR_ERR(root->node);
1473 root->node = NULL;
1474 goto fail;
1475 }
1476 if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
1477 ret = -EIO;
1478 goto fail;
1479 }
1480
1481 /*
1482 * For real fs, and not log/reloc trees, root owner must
1483 * match its root node owner
1484 */
1485 if (!test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state) &&
1486 root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID &&
1487 root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID &&
1488 root->root_key.objectid != btrfs_header_owner(root->node)) {
1489 btrfs_crit(fs_info,
1490"root=%llu block=%llu, tree root owner mismatch, have %llu expect %llu",
1491 root->root_key.objectid, root->node->start,
1492 btrfs_header_owner(root->node),
1493 root->root_key.objectid);
1494 ret = -EUCLEAN;
1495 goto fail;
1496 }
1497 root->commit_root = btrfs_root_node(root);
1498 return root;
1499fail:
1500 btrfs_put_root(root);
1501 return ERR_PTR(ret);
1502}
1503
1504struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
1505 struct btrfs_key *key)
1506{
1507 struct btrfs_root *root;
1508 struct btrfs_path *path;
1509
1510 path = btrfs_alloc_path();
1511 if (!path)
1512 return ERR_PTR(-ENOMEM);
1513 root = read_tree_root_path(tree_root, path, key);
1514 btrfs_free_path(path);
1515
1516 return root;
1517}
1518
1519/*
1520 * Initialize subvolume root in-memory structure
1521 *
1522 * @anon_dev: anonymous device to attach to the root, if zero, allocate new
1523 */
1524static int btrfs_init_fs_root(struct btrfs_root *root, dev_t anon_dev)
1525{
1526 int ret;
1527 unsigned int nofs_flag;
1528
1529 /*
1530 * We might be called under a transaction (e.g. indirect backref
1531 * resolution) which could deadlock if it triggers memory reclaim
1532 */
1533 nofs_flag = memalloc_nofs_save();
1534 ret = btrfs_drew_lock_init(&root->snapshot_lock);
1535 memalloc_nofs_restore(nofs_flag);
1536 if (ret)
1537 goto fail;
1538
1539 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID &&
1540 !btrfs_is_data_reloc_root(root)) {
1541 set_bit(BTRFS_ROOT_SHAREABLE, &root->state);
1542 btrfs_check_and_init_root_item(&root->root_item);
1543 }
1544
1545 /*
1546 * Don't assign anonymous block device to roots that are not exposed to
1547 * userspace, the id pool is limited to 1M
1548 */
1549 if (is_fstree(root->root_key.objectid) &&
1550 btrfs_root_refs(&root->root_item) > 0) {
1551 if (!anon_dev) {
1552 ret = get_anon_bdev(&root->anon_dev);
1553 if (ret)
1554 goto fail;
1555 } else {
1556 root->anon_dev = anon_dev;
1557 }
1558 }
1559
1560 mutex_lock(&root->objectid_mutex);
1561 ret = btrfs_init_root_free_objectid(root);
1562 if (ret) {
1563 mutex_unlock(&root->objectid_mutex);
1564 goto fail;
1565 }
1566
1567 ASSERT(root->free_objectid <= BTRFS_LAST_FREE_OBJECTID);
1568
1569 mutex_unlock(&root->objectid_mutex);
1570
1571 return 0;
1572fail:
1573 /* The caller is responsible to call btrfs_free_fs_root */
1574 return ret;
1575}
1576
1577static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1578 u64 root_id)
1579{
1580 struct btrfs_root *root;
1581
1582 spin_lock(&fs_info->fs_roots_radix_lock);
1583 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1584 (unsigned long)root_id);
1585 if (root)
1586 root = btrfs_grab_root(root);
1587 spin_unlock(&fs_info->fs_roots_radix_lock);
1588 return root;
1589}
1590
1591static struct btrfs_root *btrfs_get_global_root(struct btrfs_fs_info *fs_info,
1592 u64 objectid)
1593{
1594 struct btrfs_key key = {
1595 .objectid = objectid,
1596 .type = BTRFS_ROOT_ITEM_KEY,
1597 .offset = 0,
1598 };
1599
1600 if (objectid == BTRFS_ROOT_TREE_OBJECTID)
1601 return btrfs_grab_root(fs_info->tree_root);
1602 if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
1603 return btrfs_grab_root(btrfs_global_root(fs_info, &key));
1604 if (objectid == BTRFS_CHUNK_TREE_OBJECTID)
1605 return btrfs_grab_root(fs_info->chunk_root);
1606 if (objectid == BTRFS_DEV_TREE_OBJECTID)
1607 return btrfs_grab_root(fs_info->dev_root);
1608 if (objectid == BTRFS_CSUM_TREE_OBJECTID)
1609 return btrfs_grab_root(btrfs_global_root(fs_info, &key));
1610 if (objectid == BTRFS_QUOTA_TREE_OBJECTID)
1611 return btrfs_grab_root(fs_info->quota_root) ?
1612 fs_info->quota_root : ERR_PTR(-ENOENT);
1613 if (objectid == BTRFS_UUID_TREE_OBJECTID)
1614 return btrfs_grab_root(fs_info->uuid_root) ?
1615 fs_info->uuid_root : ERR_PTR(-ENOENT);
1616 if (objectid == BTRFS_BLOCK_GROUP_TREE_OBJECTID)
1617 return btrfs_grab_root(fs_info->block_group_root) ?
1618 fs_info->block_group_root : ERR_PTR(-ENOENT);
1619 if (objectid == BTRFS_FREE_SPACE_TREE_OBJECTID) {
1620 struct btrfs_root *root = btrfs_global_root(fs_info, &key);
1621
1622 return btrfs_grab_root(root) ? root : ERR_PTR(-ENOENT);
1623 }
1624 return NULL;
1625}
1626
1627int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
1628 struct btrfs_root *root)
1629{
1630 int ret;
1631
1632 ret = radix_tree_preload(GFP_NOFS);
1633 if (ret)
1634 return ret;
1635
1636 spin_lock(&fs_info->fs_roots_radix_lock);
1637 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1638 (unsigned long)root->root_key.objectid,
1639 root);
1640 if (ret == 0) {
1641 btrfs_grab_root(root);
1642 set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
1643 }
1644 spin_unlock(&fs_info->fs_roots_radix_lock);
1645 radix_tree_preload_end();
1646
1647 return ret;
1648}
1649
1650void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info)
1651{
1652#ifdef CONFIG_BTRFS_DEBUG
1653 struct btrfs_root *root;
1654
1655 while (!list_empty(&fs_info->allocated_roots)) {
1656 char buf[BTRFS_ROOT_NAME_BUF_LEN];
1657
1658 root = list_first_entry(&fs_info->allocated_roots,
1659 struct btrfs_root, leak_list);
1660 btrfs_err(fs_info, "leaked root %s refcount %d",
1661 btrfs_root_name(&root->root_key, buf),
1662 refcount_read(&root->refs));
1663 while (refcount_read(&root->refs) > 1)
1664 btrfs_put_root(root);
1665 btrfs_put_root(root);
1666 }
1667#endif
1668}
1669
1670static void free_global_roots(struct btrfs_fs_info *fs_info)
1671{
1672 struct btrfs_root *root;
1673 struct rb_node *node;
1674
1675 while ((node = rb_first_postorder(&fs_info->global_root_tree)) != NULL) {
1676 root = rb_entry(node, struct btrfs_root, rb_node);
1677 rb_erase(&root->rb_node, &fs_info->global_root_tree);
1678 btrfs_put_root(root);
1679 }
1680}
1681
1682void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
1683{
1684 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
1685 percpu_counter_destroy(&fs_info->delalloc_bytes);
1686 percpu_counter_destroy(&fs_info->ordered_bytes);
1687 percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
1688 btrfs_free_csum_hash(fs_info);
1689 btrfs_free_stripe_hash_table(fs_info);
1690 btrfs_free_ref_cache(fs_info);
1691 kfree(fs_info->balance_ctl);
1692 kfree(fs_info->delayed_root);
1693 free_global_roots(fs_info);
1694 btrfs_put_root(fs_info->tree_root);
1695 btrfs_put_root(fs_info->chunk_root);
1696 btrfs_put_root(fs_info->dev_root);
1697 btrfs_put_root(fs_info->quota_root);
1698 btrfs_put_root(fs_info->uuid_root);
1699 btrfs_put_root(fs_info->fs_root);
1700 btrfs_put_root(fs_info->data_reloc_root);
1701 btrfs_put_root(fs_info->block_group_root);
1702 btrfs_check_leaked_roots(fs_info);
1703 btrfs_extent_buffer_leak_debug_check(fs_info);
1704 kfree(fs_info->super_copy);
1705 kfree(fs_info->super_for_commit);
1706 kfree(fs_info->subpage_info);
1707 kvfree(fs_info);
1708}
1709
1710
1711/*
1712 * Get an in-memory reference of a root structure.
1713 *
1714 * For essential trees like root/extent tree, we grab it from fs_info directly.
1715 * For subvolume trees, we check the cached filesystem roots first. If not
1716 * found, then read it from disk and add it to cached fs roots.
1717 *
1718 * Caller should release the root by calling btrfs_put_root() after the usage.
1719 *
1720 * NOTE: Reloc and log trees can't be read by this function as they share the
1721 * same root objectid.
1722 *
1723 * @objectid: root id
1724 * @anon_dev: preallocated anonymous block device number for new roots,
1725 * pass 0 for new allocation.
1726 * @check_ref: whether to check root item references, If true, return -ENOENT
1727 * for orphan roots
1728 */
1729static struct btrfs_root *btrfs_get_root_ref(struct btrfs_fs_info *fs_info,
1730 u64 objectid, dev_t anon_dev,
1731 bool check_ref)
1732{
1733 struct btrfs_root *root;
1734 struct btrfs_path *path;
1735 struct btrfs_key key;
1736 int ret;
1737
1738 root = btrfs_get_global_root(fs_info, objectid);
1739 if (root)
1740 return root;
1741again:
1742 root = btrfs_lookup_fs_root(fs_info, objectid);
1743 if (root) {
1744 /* Shouldn't get preallocated anon_dev for cached roots */
1745 ASSERT(!anon_dev);
1746 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1747 btrfs_put_root(root);
1748 return ERR_PTR(-ENOENT);
1749 }
1750 return root;
1751 }
1752
1753 key.objectid = objectid;
1754 key.type = BTRFS_ROOT_ITEM_KEY;
1755 key.offset = (u64)-1;
1756 root = btrfs_read_tree_root(fs_info->tree_root, &key);
1757 if (IS_ERR(root))
1758 return root;
1759
1760 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1761 ret = -ENOENT;
1762 goto fail;
1763 }
1764
1765 ret = btrfs_init_fs_root(root, anon_dev);
1766 if (ret)
1767 goto fail;
1768
1769 path = btrfs_alloc_path();
1770 if (!path) {
1771 ret = -ENOMEM;
1772 goto fail;
1773 }
1774 key.objectid = BTRFS_ORPHAN_OBJECTID;
1775 key.type = BTRFS_ORPHAN_ITEM_KEY;
1776 key.offset = objectid;
1777
1778 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
1779 btrfs_free_path(path);
1780 if (ret < 0)
1781 goto fail;
1782 if (ret == 0)
1783 set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
1784
1785 ret = btrfs_insert_fs_root(fs_info, root);
1786 if (ret) {
1787 if (ret == -EEXIST) {
1788 btrfs_put_root(root);
1789 goto again;
1790 }
1791 goto fail;
1792 }
1793 return root;
1794fail:
1795 /*
1796 * If our caller provided us an anonymous device, then it's his
1797 * responsibility to free it in case we fail. So we have to set our
1798 * root's anon_dev to 0 to avoid a double free, once by btrfs_put_root()
1799 * and once again by our caller.
1800 */
1801 if (anon_dev)
1802 root->anon_dev = 0;
1803 btrfs_put_root(root);
1804 return ERR_PTR(ret);
1805}
1806
1807/*
1808 * Get in-memory reference of a root structure
1809 *
1810 * @objectid: tree objectid
1811 * @check_ref: if set, verify that the tree exists and the item has at least
1812 * one reference
1813 */
1814struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
1815 u64 objectid, bool check_ref)
1816{
1817 return btrfs_get_root_ref(fs_info, objectid, 0, check_ref);
1818}
1819
1820/*
1821 * Get in-memory reference of a root structure, created as new, optionally pass
1822 * the anonymous block device id
1823 *
1824 * @objectid: tree objectid
1825 * @anon_dev: if zero, allocate a new anonymous block device or use the
1826 * parameter value
1827 */
1828struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
1829 u64 objectid, dev_t anon_dev)
1830{
1831 return btrfs_get_root_ref(fs_info, objectid, anon_dev, true);
1832}
1833
1834/*
1835 * btrfs_get_fs_root_commit_root - return a root for the given objectid
1836 * @fs_info: the fs_info
1837 * @objectid: the objectid we need to lookup
1838 *
1839 * This is exclusively used for backref walking, and exists specifically because
1840 * of how qgroups does lookups. Qgroups will do a backref lookup at delayed ref
1841 * creation time, which means we may have to read the tree_root in order to look
1842 * up a fs root that is not in memory. If the root is not in memory we will
1843 * read the tree root commit root and look up the fs root from there. This is a
1844 * temporary root, it will not be inserted into the radix tree as it doesn't
1845 * have the most uptodate information, it'll simply be discarded once the
1846 * backref code is finished using the root.
1847 */
1848struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
1849 struct btrfs_path *path,
1850 u64 objectid)
1851{
1852 struct btrfs_root *root;
1853 struct btrfs_key key;
1854
1855 ASSERT(path->search_commit_root && path->skip_locking);
1856
1857 /*
1858 * This can return -ENOENT if we ask for a root that doesn't exist, but
1859 * since this is called via the backref walking code we won't be looking
1860 * up a root that doesn't exist, unless there's corruption. So if root
1861 * != NULL just return it.
1862 */
1863 root = btrfs_get_global_root(fs_info, objectid);
1864 if (root)
1865 return root;
1866
1867 root = btrfs_lookup_fs_root(fs_info, objectid);
1868 if (root)
1869 return root;
1870
1871 key.objectid = objectid;
1872 key.type = BTRFS_ROOT_ITEM_KEY;
1873 key.offset = (u64)-1;
1874 root = read_tree_root_path(fs_info->tree_root, path, &key);
1875 btrfs_release_path(path);
1876
1877 return root;
1878}
1879
1880static int cleaner_kthread(void *arg)
1881{
1882 struct btrfs_fs_info *fs_info = arg;
1883 int again;
1884
1885 while (1) {
1886 again = 0;
1887
1888 set_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1889
1890 /* Make the cleaner go to sleep early. */
1891 if (btrfs_need_cleaner_sleep(fs_info))
1892 goto sleep;
1893
1894 /*
1895 * Do not do anything if we might cause open_ctree() to block
1896 * before we have finished mounting the filesystem.
1897 */
1898 if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
1899 goto sleep;
1900
1901 if (!mutex_trylock(&fs_info->cleaner_mutex))
1902 goto sleep;
1903
1904 /*
1905 * Avoid the problem that we change the status of the fs
1906 * during the above check and trylock.
1907 */
1908 if (btrfs_need_cleaner_sleep(fs_info)) {
1909 mutex_unlock(&fs_info->cleaner_mutex);
1910 goto sleep;
1911 }
1912
1913 btrfs_run_delayed_iputs(fs_info);
1914
1915 again = btrfs_clean_one_deleted_snapshot(fs_info);
1916 mutex_unlock(&fs_info->cleaner_mutex);
1917
1918 /*
1919 * The defragger has dealt with the R/O remount and umount,
1920 * needn't do anything special here.
1921 */
1922 btrfs_run_defrag_inodes(fs_info);
1923
1924 /*
1925 * Acquires fs_info->reclaim_bgs_lock to avoid racing
1926 * with relocation (btrfs_relocate_chunk) and relocation
1927 * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
1928 * after acquiring fs_info->reclaim_bgs_lock. So we
1929 * can't hold, nor need to, fs_info->cleaner_mutex when deleting
1930 * unused block groups.
1931 */
1932 btrfs_delete_unused_bgs(fs_info);
1933
1934 /*
1935 * Reclaim block groups in the reclaim_bgs list after we deleted
1936 * all unused block_groups. This possibly gives us some more free
1937 * space.
1938 */
1939 btrfs_reclaim_bgs(fs_info);
1940sleep:
1941 clear_and_wake_up_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1942 if (kthread_should_park())
1943 kthread_parkme();
1944 if (kthread_should_stop())
1945 return 0;
1946 if (!again) {
1947 set_current_state(TASK_INTERRUPTIBLE);
1948 schedule();
1949 __set_current_state(TASK_RUNNING);
1950 }
1951 }
1952}
1953
1954static int transaction_kthread(void *arg)
1955{
1956 struct btrfs_root *root = arg;
1957 struct btrfs_fs_info *fs_info = root->fs_info;
1958 struct btrfs_trans_handle *trans;
1959 struct btrfs_transaction *cur;
1960 u64 transid;
1961 time64_t delta;
1962 unsigned long delay;
1963 bool cannot_commit;
1964
1965 do {
1966 cannot_commit = false;
1967 delay = msecs_to_jiffies(fs_info->commit_interval * 1000);
1968 mutex_lock(&fs_info->transaction_kthread_mutex);
1969
1970 spin_lock(&fs_info->trans_lock);
1971 cur = fs_info->running_transaction;
1972 if (!cur) {
1973 spin_unlock(&fs_info->trans_lock);
1974 goto sleep;
1975 }
1976
1977 delta = ktime_get_seconds() - cur->start_time;
1978 if (!test_and_clear_bit(BTRFS_FS_COMMIT_TRANS, &fs_info->flags) &&
1979 cur->state < TRANS_STATE_COMMIT_START &&
1980 delta < fs_info->commit_interval) {
1981 spin_unlock(&fs_info->trans_lock);
1982 delay -= msecs_to_jiffies((delta - 1) * 1000);
1983 delay = min(delay,
1984 msecs_to_jiffies(fs_info->commit_interval * 1000));
1985 goto sleep;
1986 }
1987 transid = cur->transid;
1988 spin_unlock(&fs_info->trans_lock);
1989
1990 /* If the file system is aborted, this will always fail. */
1991 trans = btrfs_attach_transaction(root);
1992 if (IS_ERR(trans)) {
1993 if (PTR_ERR(trans) != -ENOENT)
1994 cannot_commit = true;
1995 goto sleep;
1996 }
1997 if (transid == trans->transid) {
1998 btrfs_commit_transaction(trans);
1999 } else {
2000 btrfs_end_transaction(trans);
2001 }
2002sleep:
2003 wake_up_process(fs_info->cleaner_kthread);
2004 mutex_unlock(&fs_info->transaction_kthread_mutex);
2005
2006 if (BTRFS_FS_ERROR(fs_info))
2007 btrfs_cleanup_transaction(fs_info);
2008 if (!kthread_should_stop() &&
2009 (!btrfs_transaction_blocked(fs_info) ||
2010 cannot_commit))
2011 schedule_timeout_interruptible(delay);
2012 } while (!kthread_should_stop());
2013 return 0;
2014}
2015
2016/*
2017 * This will find the highest generation in the array of root backups. The
2018 * index of the highest array is returned, or -EINVAL if we can't find
2019 * anything.
2020 *
2021 * We check to make sure the array is valid by comparing the
2022 * generation of the latest root in the array with the generation
2023 * in the super block. If they don't match we pitch it.
2024 */
2025static int find_newest_super_backup(struct btrfs_fs_info *info)
2026{
2027 const u64 newest_gen = btrfs_super_generation(info->super_copy);
2028 u64 cur;
2029 struct btrfs_root_backup *root_backup;
2030 int i;
2031
2032 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
2033 root_backup = info->super_copy->super_roots + i;
2034 cur = btrfs_backup_tree_root_gen(root_backup);
2035 if (cur == newest_gen)
2036 return i;
2037 }
2038
2039 return -EINVAL;
2040}
2041
2042/*
2043 * copy all the root pointers into the super backup array.
2044 * this will bump the backup pointer by one when it is
2045 * done
2046 */
2047static void backup_super_roots(struct btrfs_fs_info *info)
2048{
2049 const int next_backup = info->backup_root_index;
2050 struct btrfs_root_backup *root_backup;
2051
2052 root_backup = info->super_for_commit->super_roots + next_backup;
2053
2054 /*
2055 * make sure all of our padding and empty slots get zero filled
2056 * regardless of which ones we use today
2057 */
2058 memset(root_backup, 0, sizeof(*root_backup));
2059
2060 info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
2061
2062 btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
2063 btrfs_set_backup_tree_root_gen(root_backup,
2064 btrfs_header_generation(info->tree_root->node));
2065
2066 btrfs_set_backup_tree_root_level(root_backup,
2067 btrfs_header_level(info->tree_root->node));
2068
2069 btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
2070 btrfs_set_backup_chunk_root_gen(root_backup,
2071 btrfs_header_generation(info->chunk_root->node));
2072 btrfs_set_backup_chunk_root_level(root_backup,
2073 btrfs_header_level(info->chunk_root->node));
2074
2075 if (!btrfs_fs_compat_ro(info, BLOCK_GROUP_TREE)) {
2076 struct btrfs_root *extent_root = btrfs_extent_root(info, 0);
2077 struct btrfs_root *csum_root = btrfs_csum_root(info, 0);
2078
2079 btrfs_set_backup_extent_root(root_backup,
2080 extent_root->node->start);
2081 btrfs_set_backup_extent_root_gen(root_backup,
2082 btrfs_header_generation(extent_root->node));
2083 btrfs_set_backup_extent_root_level(root_backup,
2084 btrfs_header_level(extent_root->node));
2085
2086 btrfs_set_backup_csum_root(root_backup, csum_root->node->start);
2087 btrfs_set_backup_csum_root_gen(root_backup,
2088 btrfs_header_generation(csum_root->node));
2089 btrfs_set_backup_csum_root_level(root_backup,
2090 btrfs_header_level(csum_root->node));
2091 }
2092
2093 /*
2094 * we might commit during log recovery, which happens before we set
2095 * the fs_root. Make sure it is valid before we fill it in.
2096 */
2097 if (info->fs_root && info->fs_root->node) {
2098 btrfs_set_backup_fs_root(root_backup,
2099 info->fs_root->node->start);
2100 btrfs_set_backup_fs_root_gen(root_backup,
2101 btrfs_header_generation(info->fs_root->node));
2102 btrfs_set_backup_fs_root_level(root_backup,
2103 btrfs_header_level(info->fs_root->node));
2104 }
2105
2106 btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
2107 btrfs_set_backup_dev_root_gen(root_backup,
2108 btrfs_header_generation(info->dev_root->node));
2109 btrfs_set_backup_dev_root_level(root_backup,
2110 btrfs_header_level(info->dev_root->node));
2111
2112 btrfs_set_backup_total_bytes(root_backup,
2113 btrfs_super_total_bytes(info->super_copy));
2114 btrfs_set_backup_bytes_used(root_backup,
2115 btrfs_super_bytes_used(info->super_copy));
2116 btrfs_set_backup_num_devices(root_backup,
2117 btrfs_super_num_devices(info->super_copy));
2118
2119 /*
2120 * if we don't copy this out to the super_copy, it won't get remembered
2121 * for the next commit
2122 */
2123 memcpy(&info->super_copy->super_roots,
2124 &info->super_for_commit->super_roots,
2125 sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
2126}
2127
2128/*
2129 * read_backup_root - Reads a backup root based on the passed priority. Prio 0
2130 * is the newest, prio 1/2/3 are 2nd newest/3rd newest/4th (oldest) backup roots
2131 *
2132 * fs_info - filesystem whose backup roots need to be read
2133 * priority - priority of backup root required
2134 *
2135 * Returns backup root index on success and -EINVAL otherwise.
2136 */
2137static int read_backup_root(struct btrfs_fs_info *fs_info, u8 priority)
2138{
2139 int backup_index = find_newest_super_backup(fs_info);
2140 struct btrfs_super_block *super = fs_info->super_copy;
2141 struct btrfs_root_backup *root_backup;
2142
2143 if (priority < BTRFS_NUM_BACKUP_ROOTS && backup_index >= 0) {
2144 if (priority == 0)
2145 return backup_index;
2146
2147 backup_index = backup_index + BTRFS_NUM_BACKUP_ROOTS - priority;
2148 backup_index %= BTRFS_NUM_BACKUP_ROOTS;
2149 } else {
2150 return -EINVAL;
2151 }
2152
2153 root_backup = super->super_roots + backup_index;
2154
2155 btrfs_set_super_generation(super,
2156 btrfs_backup_tree_root_gen(root_backup));
2157 btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
2158 btrfs_set_super_root_level(super,
2159 btrfs_backup_tree_root_level(root_backup));
2160 btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
2161
2162 /*
2163 * Fixme: the total bytes and num_devices need to match or we should
2164 * need a fsck
2165 */
2166 btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
2167 btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
2168
2169 return backup_index;
2170}
2171
2172/* helper to cleanup workers */
2173static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
2174{
2175 btrfs_destroy_workqueue(fs_info->fixup_workers);
2176 btrfs_destroy_workqueue(fs_info->delalloc_workers);
2177 btrfs_destroy_workqueue(fs_info->hipri_workers);
2178 btrfs_destroy_workqueue(fs_info->workers);
2179 if (fs_info->endio_workers)
2180 destroy_workqueue(fs_info->endio_workers);
2181 if (fs_info->rmw_workers)
2182 destroy_workqueue(fs_info->rmw_workers);
2183 if (fs_info->compressed_write_workers)
2184 destroy_workqueue(fs_info->compressed_write_workers);
2185 btrfs_destroy_workqueue(fs_info->endio_write_workers);
2186 btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
2187 btrfs_destroy_workqueue(fs_info->delayed_workers);
2188 btrfs_destroy_workqueue(fs_info->caching_workers);
2189 btrfs_destroy_workqueue(fs_info->flush_workers);
2190 btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
2191 if (fs_info->discard_ctl.discard_workers)
2192 destroy_workqueue(fs_info->discard_ctl.discard_workers);
2193 /*
2194 * Now that all other work queues are destroyed, we can safely destroy
2195 * the queues used for metadata I/O, since tasks from those other work
2196 * queues can do metadata I/O operations.
2197 */
2198 if (fs_info->endio_meta_workers)
2199 destroy_workqueue(fs_info->endio_meta_workers);
2200}
2201
2202static void free_root_extent_buffers(struct btrfs_root *root)
2203{
2204 if (root) {
2205 free_extent_buffer(root->node);
2206 free_extent_buffer(root->commit_root);
2207 root->node = NULL;
2208 root->commit_root = NULL;
2209 }
2210}
2211
2212static void free_global_root_pointers(struct btrfs_fs_info *fs_info)
2213{
2214 struct btrfs_root *root, *tmp;
2215
2216 rbtree_postorder_for_each_entry_safe(root, tmp,
2217 &fs_info->global_root_tree,
2218 rb_node)
2219 free_root_extent_buffers(root);
2220}
2221
2222/* helper to cleanup tree roots */
2223static void free_root_pointers(struct btrfs_fs_info *info, bool free_chunk_root)
2224{
2225 free_root_extent_buffers(info->tree_root);
2226
2227 free_global_root_pointers(info);
2228 free_root_extent_buffers(info->dev_root);
2229 free_root_extent_buffers(info->quota_root);
2230 free_root_extent_buffers(info->uuid_root);
2231 free_root_extent_buffers(info->fs_root);
2232 free_root_extent_buffers(info->data_reloc_root);
2233 free_root_extent_buffers(info->block_group_root);
2234 if (free_chunk_root)
2235 free_root_extent_buffers(info->chunk_root);
2236}
2237
2238void btrfs_put_root(struct btrfs_root *root)
2239{
2240 if (!root)
2241 return;
2242
2243 if (refcount_dec_and_test(&root->refs)) {
2244 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
2245 WARN_ON(test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state));
2246 if (root->anon_dev)
2247 free_anon_bdev(root->anon_dev);
2248 btrfs_drew_lock_destroy(&root->snapshot_lock);
2249 free_root_extent_buffers(root);
2250#ifdef CONFIG_BTRFS_DEBUG
2251 spin_lock(&root->fs_info->fs_roots_radix_lock);
2252 list_del_init(&root->leak_list);
2253 spin_unlock(&root->fs_info->fs_roots_radix_lock);
2254#endif
2255 kfree(root);
2256 }
2257}
2258
2259void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
2260{
2261 int ret;
2262 struct btrfs_root *gang[8];
2263 int i;
2264
2265 while (!list_empty(&fs_info->dead_roots)) {
2266 gang[0] = list_entry(fs_info->dead_roots.next,
2267 struct btrfs_root, root_list);
2268 list_del(&gang[0]->root_list);
2269
2270 if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state))
2271 btrfs_drop_and_free_fs_root(fs_info, gang[0]);
2272 btrfs_put_root(gang[0]);
2273 }
2274
2275 while (1) {
2276 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2277 (void **)gang, 0,
2278 ARRAY_SIZE(gang));
2279 if (!ret)
2280 break;
2281 for (i = 0; i < ret; i++)
2282 btrfs_drop_and_free_fs_root(fs_info, gang[i]);
2283 }
2284}
2285
2286static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
2287{
2288 mutex_init(&fs_info->scrub_lock);
2289 atomic_set(&fs_info->scrubs_running, 0);
2290 atomic_set(&fs_info->scrub_pause_req, 0);
2291 atomic_set(&fs_info->scrubs_paused, 0);
2292 atomic_set(&fs_info->scrub_cancel_req, 0);
2293 init_waitqueue_head(&fs_info->scrub_pause_wait);
2294 refcount_set(&fs_info->scrub_workers_refcnt, 0);
2295}
2296
2297static void btrfs_init_balance(struct btrfs_fs_info *fs_info)
2298{
2299 spin_lock_init(&fs_info->balance_lock);
2300 mutex_init(&fs_info->balance_mutex);
2301 atomic_set(&fs_info->balance_pause_req, 0);
2302 atomic_set(&fs_info->balance_cancel_req, 0);
2303 fs_info->balance_ctl = NULL;
2304 init_waitqueue_head(&fs_info->balance_wait_q);
2305 atomic_set(&fs_info->reloc_cancel_req, 0);
2306}
2307
2308static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
2309{
2310 struct inode *inode = fs_info->btree_inode;
2311 unsigned long hash = btrfs_inode_hash(BTRFS_BTREE_INODE_OBJECTID,
2312 fs_info->tree_root);
2313
2314 inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
2315 set_nlink(inode, 1);
2316 /*
2317 * we set the i_size on the btree inode to the max possible int.
2318 * the real end of the address space is determined by all of
2319 * the devices in the system
2320 */
2321 inode->i_size = OFFSET_MAX;
2322 inode->i_mapping->a_ops = &btree_aops;
2323
2324 RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
2325 extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
2326 IO_TREE_BTREE_INODE_IO);
2327 extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
2328
2329 BTRFS_I(inode)->root = btrfs_grab_root(fs_info->tree_root);
2330 BTRFS_I(inode)->location.objectid = BTRFS_BTREE_INODE_OBJECTID;
2331 BTRFS_I(inode)->location.type = 0;
2332 BTRFS_I(inode)->location.offset = 0;
2333 set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
2334 __insert_inode_hash(inode, hash);
2335}
2336
2337static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
2338{
2339 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2340 init_rwsem(&fs_info->dev_replace.rwsem);
2341 init_waitqueue_head(&fs_info->dev_replace.replace_wait);
2342}
2343
2344static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)
2345{
2346 spin_lock_init(&fs_info->qgroup_lock);
2347 mutex_init(&fs_info->qgroup_ioctl_lock);
2348 fs_info->qgroup_tree = RB_ROOT;
2349 INIT_LIST_HEAD(&fs_info->dirty_qgroups);
2350 fs_info->qgroup_seq = 1;
2351 fs_info->qgroup_ulist = NULL;
2352 fs_info->qgroup_rescan_running = false;
2353 fs_info->qgroup_drop_subtree_thres = BTRFS_MAX_LEVEL;
2354 mutex_init(&fs_info->qgroup_rescan_lock);
2355}
2356
2357static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info)
2358{
2359 u32 max_active = fs_info->thread_pool_size;
2360 unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
2361
2362 fs_info->workers =
2363 btrfs_alloc_workqueue(fs_info, "worker", flags, max_active, 16);
2364 fs_info->hipri_workers =
2365 btrfs_alloc_workqueue(fs_info, "worker-high",
2366 flags | WQ_HIGHPRI, max_active, 16);
2367
2368 fs_info->delalloc_workers =
2369 btrfs_alloc_workqueue(fs_info, "delalloc",
2370 flags, max_active, 2);
2371
2372 fs_info->flush_workers =
2373 btrfs_alloc_workqueue(fs_info, "flush_delalloc",
2374 flags, max_active, 0);
2375
2376 fs_info->caching_workers =
2377 btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0);
2378
2379 fs_info->fixup_workers =
2380 btrfs_alloc_workqueue(fs_info, "fixup", flags, 1, 0);
2381
2382 fs_info->endio_workers =
2383 alloc_workqueue("btrfs-endio", flags, max_active);
2384 fs_info->endio_meta_workers =
2385 alloc_workqueue("btrfs-endio-meta", flags, max_active);
2386 fs_info->rmw_workers = alloc_workqueue("btrfs-rmw", flags, max_active);
2387 fs_info->endio_write_workers =
2388 btrfs_alloc_workqueue(fs_info, "endio-write", flags,
2389 max_active, 2);
2390 fs_info->compressed_write_workers =
2391 alloc_workqueue("btrfs-compressed-write", flags, max_active);
2392 fs_info->endio_freespace_worker =
2393 btrfs_alloc_workqueue(fs_info, "freespace-write", flags,
2394 max_active, 0);
2395 fs_info->delayed_workers =
2396 btrfs_alloc_workqueue(fs_info, "delayed-meta", flags,
2397 max_active, 0);
2398 fs_info->qgroup_rescan_workers =
2399 btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0);
2400 fs_info->discard_ctl.discard_workers =
2401 alloc_workqueue("btrfs_discard", WQ_UNBOUND | WQ_FREEZABLE, 1);
2402
2403 if (!(fs_info->workers && fs_info->hipri_workers &&
2404 fs_info->delalloc_workers && fs_info->flush_workers &&
2405 fs_info->endio_workers && fs_info->endio_meta_workers &&
2406 fs_info->compressed_write_workers &&
2407 fs_info->endio_write_workers &&
2408 fs_info->endio_freespace_worker && fs_info->rmw_workers &&
2409 fs_info->caching_workers && fs_info->fixup_workers &&
2410 fs_info->delayed_workers && fs_info->qgroup_rescan_workers &&
2411 fs_info->discard_ctl.discard_workers)) {
2412 return -ENOMEM;
2413 }
2414
2415 return 0;
2416}
2417
2418static int btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type)
2419{
2420 struct crypto_shash *csum_shash;
2421 const char *csum_driver = btrfs_super_csum_driver(csum_type);
2422
2423 csum_shash = crypto_alloc_shash(csum_driver, 0, 0);
2424
2425 if (IS_ERR(csum_shash)) {
2426 btrfs_err(fs_info, "error allocating %s hash for checksum",
2427 csum_driver);
2428 return PTR_ERR(csum_shash);
2429 }
2430
2431 fs_info->csum_shash = csum_shash;
2432
2433 btrfs_info(fs_info, "using %s (%s) checksum algorithm",
2434 btrfs_super_csum_name(csum_type),
2435 crypto_shash_driver_name(csum_shash));
2436 return 0;
2437}
2438
2439static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
2440 struct btrfs_fs_devices *fs_devices)
2441{
2442 int ret;
2443 struct btrfs_tree_parent_check check = { 0 };
2444 struct btrfs_root *log_tree_root;
2445 struct btrfs_super_block *disk_super = fs_info->super_copy;
2446 u64 bytenr = btrfs_super_log_root(disk_super);
2447 int level = btrfs_super_log_root_level(disk_super);
2448
2449 if (fs_devices->rw_devices == 0) {
2450 btrfs_warn(fs_info, "log replay required on RO media");
2451 return -EIO;
2452 }
2453
2454 log_tree_root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID,
2455 GFP_KERNEL);
2456 if (!log_tree_root)
2457 return -ENOMEM;
2458
2459 check.level = level;
2460 check.transid = fs_info->generation + 1;
2461 check.owner_root = BTRFS_TREE_LOG_OBJECTID;
2462 log_tree_root->node = read_tree_block(fs_info, bytenr, &check);
2463 if (IS_ERR(log_tree_root->node)) {
2464 btrfs_warn(fs_info, "failed to read log tree");
2465 ret = PTR_ERR(log_tree_root->node);
2466 log_tree_root->node = NULL;
2467 btrfs_put_root(log_tree_root);
2468 return ret;
2469 }
2470 if (!extent_buffer_uptodate(log_tree_root->node)) {
2471 btrfs_err(fs_info, "failed to read log tree");
2472 btrfs_put_root(log_tree_root);
2473 return -EIO;
2474 }
2475
2476 /* returns with log_tree_root freed on success */
2477 ret = btrfs_recover_log_trees(log_tree_root);
2478 if (ret) {
2479 btrfs_handle_fs_error(fs_info, ret,
2480 "Failed to recover log tree");
2481 btrfs_put_root(log_tree_root);
2482 return ret;
2483 }
2484
2485 if (sb_rdonly(fs_info->sb)) {
2486 ret = btrfs_commit_super(fs_info);
2487 if (ret)
2488 return ret;
2489 }
2490
2491 return 0;
2492}
2493
2494static int load_global_roots_objectid(struct btrfs_root *tree_root,
2495 struct btrfs_path *path, u64 objectid,
2496 const char *name)
2497{
2498 struct btrfs_fs_info *fs_info = tree_root->fs_info;
2499 struct btrfs_root *root;
2500 u64 max_global_id = 0;
2501 int ret;
2502 struct btrfs_key key = {
2503 .objectid = objectid,
2504 .type = BTRFS_ROOT_ITEM_KEY,
2505 .offset = 0,
2506 };
2507 bool found = false;
2508
2509 /* If we have IGNOREDATACSUMS skip loading these roots. */
2510 if (objectid == BTRFS_CSUM_TREE_OBJECTID &&
2511 btrfs_test_opt(fs_info, IGNOREDATACSUMS)) {
2512 set_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state);
2513 return 0;
2514 }
2515
2516 while (1) {
2517 ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
2518 if (ret < 0)
2519 break;
2520
2521 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
2522 ret = btrfs_next_leaf(tree_root, path);
2523 if (ret) {
2524 if (ret > 0)
2525 ret = 0;
2526 break;
2527 }
2528 }
2529 ret = 0;
2530
2531 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
2532 if (key.objectid != objectid)
2533 break;
2534 btrfs_release_path(path);
2535
2536 /*
2537 * Just worry about this for extent tree, it'll be the same for
2538 * everybody.
2539 */
2540 if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
2541 max_global_id = max(max_global_id, key.offset);
2542
2543 found = true;
2544 root = read_tree_root_path(tree_root, path, &key);
2545 if (IS_ERR(root)) {
2546 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS))
2547 ret = PTR_ERR(root);
2548 break;
2549 }
2550 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2551 ret = btrfs_global_root_insert(root);
2552 if (ret) {
2553 btrfs_put_root(root);
2554 break;
2555 }
2556 key.offset++;
2557 }
2558 btrfs_release_path(path);
2559
2560 if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
2561 fs_info->nr_global_roots = max_global_id + 1;
2562
2563 if (!found || ret) {
2564 if (objectid == BTRFS_CSUM_TREE_OBJECTID)
2565 set_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state);
2566
2567 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS))
2568 ret = ret ? ret : -ENOENT;
2569 else
2570 ret = 0;
2571 btrfs_err(fs_info, "failed to load root %s", name);
2572 }
2573 return ret;
2574}
2575
2576static int load_global_roots(struct btrfs_root *tree_root)
2577{
2578 struct btrfs_path *path;
2579 int ret = 0;
2580
2581 path = btrfs_alloc_path();
2582 if (!path)
2583 return -ENOMEM;
2584
2585 ret = load_global_roots_objectid(tree_root, path,
2586 BTRFS_EXTENT_TREE_OBJECTID, "extent");
2587 if (ret)
2588 goto out;
2589 ret = load_global_roots_objectid(tree_root, path,
2590 BTRFS_CSUM_TREE_OBJECTID, "csum");
2591 if (ret)
2592 goto out;
2593 if (!btrfs_fs_compat_ro(tree_root->fs_info, FREE_SPACE_TREE))
2594 goto out;
2595 ret = load_global_roots_objectid(tree_root, path,
2596 BTRFS_FREE_SPACE_TREE_OBJECTID,
2597 "free space");
2598out:
2599 btrfs_free_path(path);
2600 return ret;
2601}
2602
2603static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
2604{
2605 struct btrfs_root *tree_root = fs_info->tree_root;
2606 struct btrfs_root *root;
2607 struct btrfs_key location;
2608 int ret;
2609
2610 BUG_ON(!fs_info->tree_root);
2611
2612 ret = load_global_roots(tree_root);
2613 if (ret)
2614 return ret;
2615
2616 location.type = BTRFS_ROOT_ITEM_KEY;
2617 location.offset = 0;
2618
2619 if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE)) {
2620 location.objectid = BTRFS_BLOCK_GROUP_TREE_OBJECTID;
2621 root = btrfs_read_tree_root(tree_root, &location);
2622 if (IS_ERR(root)) {
2623 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
2624 ret = PTR_ERR(root);
2625 goto out;
2626 }
2627 } else {
2628 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2629 fs_info->block_group_root = root;
2630 }
2631 }
2632
2633 location.objectid = BTRFS_DEV_TREE_OBJECTID;
2634 root = btrfs_read_tree_root(tree_root, &location);
2635 if (IS_ERR(root)) {
2636 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
2637 ret = PTR_ERR(root);
2638 goto out;
2639 }
2640 } else {
2641 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2642 fs_info->dev_root = root;
2643 }
2644 /* Initialize fs_info for all devices in any case */
2645 ret = btrfs_init_devices_late(fs_info);
2646 if (ret)
2647 goto out;
2648
2649 /*
2650 * This tree can share blocks with some other fs tree during relocation
2651 * and we need a proper setup by btrfs_get_fs_root
2652 */
2653 root = btrfs_get_fs_root(tree_root->fs_info,
2654 BTRFS_DATA_RELOC_TREE_OBJECTID, true);
2655 if (IS_ERR(root)) {
2656 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
2657 ret = PTR_ERR(root);
2658 goto out;
2659 }
2660 } else {
2661 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2662 fs_info->data_reloc_root = root;
2663 }
2664
2665 location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
2666 root = btrfs_read_tree_root(tree_root, &location);
2667 if (!IS_ERR(root)) {
2668 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2669 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
2670 fs_info->quota_root = root;
2671 }
2672
2673 location.objectid = BTRFS_UUID_TREE_OBJECTID;
2674 root = btrfs_read_tree_root(tree_root, &location);
2675 if (IS_ERR(root)) {
2676 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
2677 ret = PTR_ERR(root);
2678 if (ret != -ENOENT)
2679 goto out;
2680 }
2681 } else {
2682 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2683 fs_info->uuid_root = root;
2684 }
2685
2686 return 0;
2687out:
2688 btrfs_warn(fs_info, "failed to read root (objectid=%llu): %d",
2689 location.objectid, ret);
2690 return ret;
2691}
2692
2693/*
2694 * Real super block validation
2695 * NOTE: super csum type and incompat features will not be checked here.
2696 *
2697 * @sb: super block to check
2698 * @mirror_num: the super block number to check its bytenr:
2699 * 0 the primary (1st) sb
2700 * 1, 2 2nd and 3rd backup copy
2701 * -1 skip bytenr check
2702 */
2703int btrfs_validate_super(struct btrfs_fs_info *fs_info,
2704 struct btrfs_super_block *sb, int mirror_num)
2705{
2706 u64 nodesize = btrfs_super_nodesize(sb);
2707 u64 sectorsize = btrfs_super_sectorsize(sb);
2708 int ret = 0;
2709
2710 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
2711 btrfs_err(fs_info, "no valid FS found");
2712 ret = -EINVAL;
2713 }
2714 if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP) {
2715 btrfs_err(fs_info, "unrecognized or unsupported super flag: %llu",
2716 btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
2717 ret = -EINVAL;
2718 }
2719 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
2720 btrfs_err(fs_info, "tree_root level too big: %d >= %d",
2721 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
2722 ret = -EINVAL;
2723 }
2724 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
2725 btrfs_err(fs_info, "chunk_root level too big: %d >= %d",
2726 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
2727 ret = -EINVAL;
2728 }
2729 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
2730 btrfs_err(fs_info, "log_root level too big: %d >= %d",
2731 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
2732 ret = -EINVAL;
2733 }
2734
2735 /*
2736 * Check sectorsize and nodesize first, other check will need it.
2737 * Check all possible sectorsize(4K, 8K, 16K, 32K, 64K) here.
2738 */
2739 if (!is_power_of_2(sectorsize) || sectorsize < 4096 ||
2740 sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2741 btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
2742 ret = -EINVAL;
2743 }
2744
2745 /*
2746 * We only support at most two sectorsizes: 4K and PAGE_SIZE.
2747 *
2748 * We can support 16K sectorsize with 64K page size without problem,
2749 * but such sectorsize/pagesize combination doesn't make much sense.
2750 * 4K will be our future standard, PAGE_SIZE is supported from the very
2751 * beginning.
2752 */
2753 if (sectorsize > PAGE_SIZE || (sectorsize != SZ_4K && sectorsize != PAGE_SIZE)) {
2754 btrfs_err(fs_info,
2755 "sectorsize %llu not yet supported for page size %lu",
2756 sectorsize, PAGE_SIZE);
2757 ret = -EINVAL;
2758 }
2759
2760 if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
2761 nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2762 btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
2763 ret = -EINVAL;
2764 }
2765 if (nodesize != le32_to_cpu(sb->__unused_leafsize)) {
2766 btrfs_err(fs_info, "invalid leafsize %u, should be %llu",
2767 le32_to_cpu(sb->__unused_leafsize), nodesize);
2768 ret = -EINVAL;
2769 }
2770
2771 /* Root alignment check */
2772 if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) {
2773 btrfs_warn(fs_info, "tree_root block unaligned: %llu",
2774 btrfs_super_root(sb));
2775 ret = -EINVAL;
2776 }
2777 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) {
2778 btrfs_warn(fs_info, "chunk_root block unaligned: %llu",
2779 btrfs_super_chunk_root(sb));
2780 ret = -EINVAL;
2781 }
2782 if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) {
2783 btrfs_warn(fs_info, "log_root block unaligned: %llu",
2784 btrfs_super_log_root(sb));
2785 ret = -EINVAL;
2786 }
2787
2788 if (memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid,
2789 BTRFS_FSID_SIZE)) {
2790 btrfs_err(fs_info,
2791 "superblock fsid doesn't match fsid of fs_devices: %pU != %pU",
2792 fs_info->super_copy->fsid, fs_info->fs_devices->fsid);
2793 ret = -EINVAL;
2794 }
2795
2796 if (btrfs_fs_incompat(fs_info, METADATA_UUID) &&
2797 memcmp(fs_info->fs_devices->metadata_uuid,
2798 fs_info->super_copy->metadata_uuid, BTRFS_FSID_SIZE)) {
2799 btrfs_err(fs_info,
2800"superblock metadata_uuid doesn't match metadata uuid of fs_devices: %pU != %pU",
2801 fs_info->super_copy->metadata_uuid,
2802 fs_info->fs_devices->metadata_uuid);
2803 ret = -EINVAL;
2804 }
2805
2806 /*
2807 * Artificial requirement for block-group-tree to force newer features
2808 * (free-space-tree, no-holes) so the test matrix is smaller.
2809 */
2810 if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE) &&
2811 (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID) ||
2812 !btrfs_fs_incompat(fs_info, NO_HOLES))) {
2813 btrfs_err(fs_info,
2814 "block-group-tree feature requires fres-space-tree and no-holes");
2815 ret = -EINVAL;
2816 }
2817
2818 if (memcmp(fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid,
2819 BTRFS_FSID_SIZE) != 0) {
2820 btrfs_err(fs_info,
2821 "dev_item UUID does not match metadata fsid: %pU != %pU",
2822 fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid);
2823 ret = -EINVAL;
2824 }
2825
2826 /*
2827 * Hint to catch really bogus numbers, bitflips or so, more exact checks are
2828 * done later
2829 */
2830 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
2831 btrfs_err(fs_info, "bytes_used is too small %llu",
2832 btrfs_super_bytes_used(sb));
2833 ret = -EINVAL;
2834 }
2835 if (!is_power_of_2(btrfs_super_stripesize(sb))) {
2836 btrfs_err(fs_info, "invalid stripesize %u",
2837 btrfs_super_stripesize(sb));
2838 ret = -EINVAL;
2839 }
2840 if (btrfs_super_num_devices(sb) > (1UL << 31))
2841 btrfs_warn(fs_info, "suspicious number of devices: %llu",
2842 btrfs_super_num_devices(sb));
2843 if (btrfs_super_num_devices(sb) == 0) {
2844 btrfs_err(fs_info, "number of devices is 0");
2845 ret = -EINVAL;
2846 }
2847
2848 if (mirror_num >= 0 &&
2849 btrfs_super_bytenr(sb) != btrfs_sb_offset(mirror_num)) {
2850 btrfs_err(fs_info, "super offset mismatch %llu != %u",
2851 btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
2852 ret = -EINVAL;
2853 }
2854
2855 /*
2856 * Obvious sys_chunk_array corruptions, it must hold at least one key
2857 * and one chunk
2858 */
2859 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
2860 btrfs_err(fs_info, "system chunk array too big %u > %u",
2861 btrfs_super_sys_array_size(sb),
2862 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
2863 ret = -EINVAL;
2864 }
2865 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
2866 + sizeof(struct btrfs_chunk)) {
2867 btrfs_err(fs_info, "system chunk array too small %u < %zu",
2868 btrfs_super_sys_array_size(sb),
2869 sizeof(struct btrfs_disk_key)
2870 + sizeof(struct btrfs_chunk));
2871 ret = -EINVAL;
2872 }
2873
2874 /*
2875 * The generation is a global counter, we'll trust it more than the others
2876 * but it's still possible that it's the one that's wrong.
2877 */
2878 if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
2879 btrfs_warn(fs_info,
2880 "suspicious: generation < chunk_root_generation: %llu < %llu",
2881 btrfs_super_generation(sb),
2882 btrfs_super_chunk_root_generation(sb));
2883 if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
2884 && btrfs_super_cache_generation(sb) != (u64)-1)
2885 btrfs_warn(fs_info,
2886 "suspicious: generation < cache_generation: %llu < %llu",
2887 btrfs_super_generation(sb),
2888 btrfs_super_cache_generation(sb));
2889
2890 return ret;
2891}
2892
2893/*
2894 * Validation of super block at mount time.
2895 * Some checks already done early at mount time, like csum type and incompat
2896 * flags will be skipped.
2897 */
2898static int btrfs_validate_mount_super(struct btrfs_fs_info *fs_info)
2899{
2900 return btrfs_validate_super(fs_info, fs_info->super_copy, 0);
2901}
2902
2903/*
2904 * Validation of super block at write time.
2905 * Some checks like bytenr check will be skipped as their values will be
2906 * overwritten soon.
2907 * Extra checks like csum type and incompat flags will be done here.
2908 */
2909static int btrfs_validate_write_super(struct btrfs_fs_info *fs_info,
2910 struct btrfs_super_block *sb)
2911{
2912 int ret;
2913
2914 ret = btrfs_validate_super(fs_info, sb, -1);
2915 if (ret < 0)
2916 goto out;
2917 if (!btrfs_supported_super_csum(btrfs_super_csum_type(sb))) {
2918 ret = -EUCLEAN;
2919 btrfs_err(fs_info, "invalid csum type, has %u want %u",
2920 btrfs_super_csum_type(sb), BTRFS_CSUM_TYPE_CRC32);
2921 goto out;
2922 }
2923 if (btrfs_super_incompat_flags(sb) & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
2924 ret = -EUCLEAN;
2925 btrfs_err(fs_info,
2926 "invalid incompat flags, has 0x%llx valid mask 0x%llx",
2927 btrfs_super_incompat_flags(sb),
2928 (unsigned long long)BTRFS_FEATURE_INCOMPAT_SUPP);
2929 goto out;
2930 }
2931out:
2932 if (ret < 0)
2933 btrfs_err(fs_info,
2934 "super block corruption detected before writing it to disk");
2935 return ret;
2936}
2937
2938static int load_super_root(struct btrfs_root *root, u64 bytenr, u64 gen, int level)
2939{
2940 struct btrfs_tree_parent_check check = {
2941 .level = level,
2942 .transid = gen,
2943 .owner_root = root->root_key.objectid
2944 };
2945 int ret = 0;
2946
2947 root->node = read_tree_block(root->fs_info, bytenr, &check);
2948 if (IS_ERR(root->node)) {
2949 ret = PTR_ERR(root->node);
2950 root->node = NULL;
2951 return ret;
2952 }
2953 if (!extent_buffer_uptodate(root->node)) {
2954 free_extent_buffer(root->node);
2955 root->node = NULL;
2956 return -EIO;
2957 }
2958
2959 btrfs_set_root_node(&root->root_item, root->node);
2960 root->commit_root = btrfs_root_node(root);
2961 btrfs_set_root_refs(&root->root_item, 1);
2962 return ret;
2963}
2964
2965static int load_important_roots(struct btrfs_fs_info *fs_info)
2966{
2967 struct btrfs_super_block *sb = fs_info->super_copy;
2968 u64 gen, bytenr;
2969 int level, ret;
2970
2971 bytenr = btrfs_super_root(sb);
2972 gen = btrfs_super_generation(sb);
2973 level = btrfs_super_root_level(sb);
2974 ret = load_super_root(fs_info->tree_root, bytenr, gen, level);
2975 if (ret) {
2976 btrfs_warn(fs_info, "couldn't read tree root");
2977 return ret;
2978 }
2979 return 0;
2980}
2981
2982static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
2983{
2984 int backup_index = find_newest_super_backup(fs_info);
2985 struct btrfs_super_block *sb = fs_info->super_copy;
2986 struct btrfs_root *tree_root = fs_info->tree_root;
2987 bool handle_error = false;
2988 int ret = 0;
2989 int i;
2990
2991 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
2992 if (handle_error) {
2993 if (!IS_ERR(tree_root->node))
2994 free_extent_buffer(tree_root->node);
2995 tree_root->node = NULL;
2996
2997 if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
2998 break;
2999
3000 free_root_pointers(fs_info, 0);
3001
3002 /*
3003 * Don't use the log in recovery mode, it won't be
3004 * valid
3005 */
3006 btrfs_set_super_log_root(sb, 0);
3007
3008 /* We can't trust the free space cache either */
3009 btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
3010
3011 ret = read_backup_root(fs_info, i);
3012 backup_index = ret;
3013 if (ret < 0)
3014 return ret;
3015 }
3016
3017 ret = load_important_roots(fs_info);
3018 if (ret) {
3019 handle_error = true;
3020 continue;
3021 }
3022
3023 /*
3024 * No need to hold btrfs_root::objectid_mutex since the fs
3025 * hasn't been fully initialised and we are the only user
3026 */
3027 ret = btrfs_init_root_free_objectid(tree_root);
3028 if (ret < 0) {
3029 handle_error = true;
3030 continue;
3031 }
3032
3033 ASSERT(tree_root->free_objectid <= BTRFS_LAST_FREE_OBJECTID);
3034
3035 ret = btrfs_read_roots(fs_info);
3036 if (ret < 0) {
3037 handle_error = true;
3038 continue;
3039 }
3040
3041 /* All successful */
3042 fs_info->generation = btrfs_header_generation(tree_root->node);
3043 fs_info->last_trans_committed = fs_info->generation;
3044 fs_info->last_reloc_trans = 0;
3045
3046 /* Always begin writing backup roots after the one being used */
3047 if (backup_index < 0) {
3048 fs_info->backup_root_index = 0;
3049 } else {
3050 fs_info->backup_root_index = backup_index + 1;
3051 fs_info->backup_root_index %= BTRFS_NUM_BACKUP_ROOTS;
3052 }
3053 break;
3054 }
3055
3056 return ret;
3057}
3058
3059void btrfs_init_fs_info(struct btrfs_fs_info *fs_info)
3060{
3061 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
3062 INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
3063 INIT_LIST_HEAD(&fs_info->trans_list);
3064 INIT_LIST_HEAD(&fs_info->dead_roots);
3065 INIT_LIST_HEAD(&fs_info->delayed_iputs);
3066 INIT_LIST_HEAD(&fs_info->delalloc_roots);
3067 INIT_LIST_HEAD(&fs_info->caching_block_groups);
3068 spin_lock_init(&fs_info->delalloc_root_lock);
3069 spin_lock_init(&fs_info->trans_lock);
3070 spin_lock_init(&fs_info->fs_roots_radix_lock);
3071 spin_lock_init(&fs_info->delayed_iput_lock);
3072 spin_lock_init(&fs_info->defrag_inodes_lock);
3073 spin_lock_init(&fs_info->super_lock);
3074 spin_lock_init(&fs_info->buffer_lock);
3075 spin_lock_init(&fs_info->unused_bgs_lock);
3076 spin_lock_init(&fs_info->treelog_bg_lock);
3077 spin_lock_init(&fs_info->zone_active_bgs_lock);
3078 spin_lock_init(&fs_info->relocation_bg_lock);
3079 rwlock_init(&fs_info->tree_mod_log_lock);
3080 rwlock_init(&fs_info->global_root_lock);
3081 mutex_init(&fs_info->unused_bg_unpin_mutex);
3082 mutex_init(&fs_info->reclaim_bgs_lock);
3083 mutex_init(&fs_info->reloc_mutex);
3084 mutex_init(&fs_info->delalloc_root_mutex);
3085 mutex_init(&fs_info->zoned_meta_io_lock);
3086 mutex_init(&fs_info->zoned_data_reloc_io_lock);
3087 seqlock_init(&fs_info->profiles_lock);
3088
3089 btrfs_lockdep_init_map(fs_info, btrfs_trans_num_writers);
3090 btrfs_lockdep_init_map(fs_info, btrfs_trans_num_extwriters);
3091 btrfs_lockdep_init_map(fs_info, btrfs_trans_pending_ordered);
3092 btrfs_lockdep_init_map(fs_info, btrfs_ordered_extent);
3093 btrfs_state_lockdep_init_map(fs_info, btrfs_trans_commit_start,
3094 BTRFS_LOCKDEP_TRANS_COMMIT_START);
3095 btrfs_state_lockdep_init_map(fs_info, btrfs_trans_unblocked,
3096 BTRFS_LOCKDEP_TRANS_UNBLOCKED);
3097 btrfs_state_lockdep_init_map(fs_info, btrfs_trans_super_committed,
3098 BTRFS_LOCKDEP_TRANS_SUPER_COMMITTED);
3099 btrfs_state_lockdep_init_map(fs_info, btrfs_trans_completed,
3100 BTRFS_LOCKDEP_TRANS_COMPLETED);
3101
3102 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
3103 INIT_LIST_HEAD(&fs_info->space_info);
3104 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
3105 INIT_LIST_HEAD(&fs_info->unused_bgs);
3106 INIT_LIST_HEAD(&fs_info->reclaim_bgs);
3107 INIT_LIST_HEAD(&fs_info->zone_active_bgs);
3108#ifdef CONFIG_BTRFS_DEBUG
3109 INIT_LIST_HEAD(&fs_info->allocated_roots);
3110 INIT_LIST_HEAD(&fs_info->allocated_ebs);
3111 spin_lock_init(&fs_info->eb_leak_lock);
3112#endif
3113 extent_map_tree_init(&fs_info->mapping_tree);
3114 btrfs_init_block_rsv(&fs_info->global_block_rsv,
3115 BTRFS_BLOCK_RSV_GLOBAL);
3116 btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
3117 btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
3118 btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
3119 btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
3120 BTRFS_BLOCK_RSV_DELOPS);
3121 btrfs_init_block_rsv(&fs_info->delayed_refs_rsv,
3122 BTRFS_BLOCK_RSV_DELREFS);
3123
3124 atomic_set(&fs_info->async_delalloc_pages, 0);
3125 atomic_set(&fs_info->defrag_running, 0);
3126 atomic_set(&fs_info->nr_delayed_iputs, 0);
3127 atomic64_set(&fs_info->tree_mod_seq, 0);
3128 fs_info->global_root_tree = RB_ROOT;
3129 fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
3130 fs_info->metadata_ratio = 0;
3131 fs_info->defrag_inodes = RB_ROOT;
3132 atomic64_set(&fs_info->free_chunk_space, 0);
3133 fs_info->tree_mod_log = RB_ROOT;
3134 fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
3135 fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
3136 btrfs_init_ref_verify(fs_info);
3137
3138 fs_info->thread_pool_size = min_t(unsigned long,
3139 num_online_cpus() + 2, 8);
3140
3141 INIT_LIST_HEAD(&fs_info->ordered_roots);
3142 spin_lock_init(&fs_info->ordered_root_lock);
3143
3144 btrfs_init_scrub(fs_info);
3145#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3146 fs_info->check_integrity_print_mask = 0;
3147#endif
3148 btrfs_init_balance(fs_info);
3149 btrfs_init_async_reclaim_work(fs_info);
3150
3151 rwlock_init(&fs_info->block_group_cache_lock);
3152 fs_info->block_group_cache_tree = RB_ROOT_CACHED;
3153
3154 extent_io_tree_init(fs_info, &fs_info->excluded_extents,
3155 IO_TREE_FS_EXCLUDED_EXTENTS);
3156
3157 mutex_init(&fs_info->ordered_operations_mutex);
3158 mutex_init(&fs_info->tree_log_mutex);
3159 mutex_init(&fs_info->chunk_mutex);
3160 mutex_init(&fs_info->transaction_kthread_mutex);
3161 mutex_init(&fs_info->cleaner_mutex);
3162 mutex_init(&fs_info->ro_block_group_mutex);
3163 init_rwsem(&fs_info->commit_root_sem);
3164 init_rwsem(&fs_info->cleanup_work_sem);
3165 init_rwsem(&fs_info->subvol_sem);
3166 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
3167
3168 btrfs_init_dev_replace_locks(fs_info);
3169 btrfs_init_qgroup(fs_info);
3170 btrfs_discard_init(fs_info);
3171
3172 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
3173 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
3174
3175 init_waitqueue_head(&fs_info->transaction_throttle);
3176 init_waitqueue_head(&fs_info->transaction_wait);
3177 init_waitqueue_head(&fs_info->transaction_blocked_wait);
3178 init_waitqueue_head(&fs_info->async_submit_wait);
3179 init_waitqueue_head(&fs_info->delayed_iputs_wait);
3180
3181 /* Usable values until the real ones are cached from the superblock */
3182 fs_info->nodesize = 4096;
3183 fs_info->sectorsize = 4096;
3184 fs_info->sectorsize_bits = ilog2(4096);
3185 fs_info->stripesize = 4096;
3186
3187 fs_info->max_extent_size = BTRFS_MAX_EXTENT_SIZE;
3188
3189 spin_lock_init(&fs_info->swapfile_pins_lock);
3190 fs_info->swapfile_pins = RB_ROOT;
3191
3192 fs_info->bg_reclaim_threshold = BTRFS_DEFAULT_RECLAIM_THRESH;
3193 INIT_WORK(&fs_info->reclaim_bgs_work, btrfs_reclaim_bgs_work);
3194}
3195
3196static int init_mount_fs_info(struct btrfs_fs_info *fs_info, struct super_block *sb)
3197{
3198 int ret;
3199
3200 fs_info->sb = sb;
3201 sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
3202 sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
3203
3204 ret = percpu_counter_init(&fs_info->ordered_bytes, 0, GFP_KERNEL);
3205 if (ret)
3206 return ret;
3207
3208 ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
3209 if (ret)
3210 return ret;
3211
3212 fs_info->dirty_metadata_batch = PAGE_SIZE *
3213 (1 + ilog2(nr_cpu_ids));
3214
3215 ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
3216 if (ret)
3217 return ret;
3218
3219 ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
3220 GFP_KERNEL);
3221 if (ret)
3222 return ret;
3223
3224 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
3225 GFP_KERNEL);
3226 if (!fs_info->delayed_root)
3227 return -ENOMEM;
3228 btrfs_init_delayed_root(fs_info->delayed_root);
3229
3230 if (sb_rdonly(sb))
3231 set_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state);
3232
3233 return btrfs_alloc_stripe_hash_table(fs_info);
3234}
3235
3236static int btrfs_uuid_rescan_kthread(void *data)
3237{
3238 struct btrfs_fs_info *fs_info = data;
3239 int ret;
3240
3241 /*
3242 * 1st step is to iterate through the existing UUID tree and
3243 * to delete all entries that contain outdated data.
3244 * 2nd step is to add all missing entries to the UUID tree.
3245 */
3246 ret = btrfs_uuid_tree_iterate(fs_info);
3247 if (ret < 0) {
3248 if (ret != -EINTR)
3249 btrfs_warn(fs_info, "iterating uuid_tree failed %d",
3250 ret);
3251 up(&fs_info->uuid_tree_rescan_sem);
3252 return ret;
3253 }
3254 return btrfs_uuid_scan_kthread(data);
3255}
3256
3257static int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info)
3258{
3259 struct task_struct *task;
3260
3261 down(&fs_info->uuid_tree_rescan_sem);
3262 task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid");
3263 if (IS_ERR(task)) {
3264 /* fs_info->update_uuid_tree_gen remains 0 in all error case */
3265 btrfs_warn(fs_info, "failed to start uuid_rescan task");
3266 up(&fs_info->uuid_tree_rescan_sem);
3267 return PTR_ERR(task);
3268 }
3269
3270 return 0;
3271}
3272
3273/*
3274 * Some options only have meaning at mount time and shouldn't persist across
3275 * remounts, or be displayed. Clear these at the end of mount and remount
3276 * code paths.
3277 */
3278void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info)
3279{
3280 btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
3281 btrfs_clear_opt(fs_info->mount_opt, CLEAR_CACHE);
3282}
3283
3284/*
3285 * Mounting logic specific to read-write file systems. Shared by open_ctree
3286 * and btrfs_remount when remounting from read-only to read-write.
3287 */
3288int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info)
3289{
3290 int ret;
3291 const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE);
3292 bool clear_free_space_tree = false;
3293
3294 if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
3295 btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3296 clear_free_space_tree = true;
3297 } else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
3298 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
3299 btrfs_warn(fs_info, "free space tree is invalid");
3300 clear_free_space_tree = true;
3301 }
3302
3303 if (clear_free_space_tree) {
3304 btrfs_info(fs_info, "clearing free space tree");
3305 ret = btrfs_clear_free_space_tree(fs_info);
3306 if (ret) {
3307 btrfs_warn(fs_info,
3308 "failed to clear free space tree: %d", ret);
3309 goto out;
3310 }
3311 }
3312
3313 /*
3314 * btrfs_find_orphan_roots() is responsible for finding all the dead
3315 * roots (with 0 refs), flag them with BTRFS_ROOT_DEAD_TREE and load
3316 * them into the fs_info->fs_roots_radix tree. This must be done before
3317 * calling btrfs_orphan_cleanup() on the tree root. If we don't do it
3318 * first, then btrfs_orphan_cleanup() will delete a dead root's orphan
3319 * item before the root's tree is deleted - this means that if we unmount
3320 * or crash before the deletion completes, on the next mount we will not
3321 * delete what remains of the tree because the orphan item does not
3322 * exists anymore, which is what tells us we have a pending deletion.
3323 */
3324 ret = btrfs_find_orphan_roots(fs_info);
3325 if (ret)
3326 goto out;
3327
3328 ret = btrfs_cleanup_fs_roots(fs_info);
3329 if (ret)
3330 goto out;
3331
3332 down_read(&fs_info->cleanup_work_sem);
3333 if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
3334 (ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
3335 up_read(&fs_info->cleanup_work_sem);
3336 goto out;
3337 }
3338 up_read(&fs_info->cleanup_work_sem);
3339
3340 mutex_lock(&fs_info->cleaner_mutex);
3341 ret = btrfs_recover_relocation(fs_info);
3342 mutex_unlock(&fs_info->cleaner_mutex);
3343 if (ret < 0) {
3344 btrfs_warn(fs_info, "failed to recover relocation: %d", ret);
3345 goto out;
3346 }
3347
3348 if (btrfs_test_opt(fs_info, FREE_SPACE_TREE) &&
3349 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3350 btrfs_info(fs_info, "creating free space tree");
3351 ret = btrfs_create_free_space_tree(fs_info);
3352 if (ret) {
3353 btrfs_warn(fs_info,
3354 "failed to create free space tree: %d", ret);
3355 goto out;
3356 }
3357 }
3358
3359 if (cache_opt != btrfs_free_space_cache_v1_active(fs_info)) {
3360 ret = btrfs_set_free_space_cache_v1_active(fs_info, cache_opt);
3361 if (ret)
3362 goto out;
3363 }
3364
3365 ret = btrfs_resume_balance_async(fs_info);
3366 if (ret)
3367 goto out;
3368
3369 ret = btrfs_resume_dev_replace_async(fs_info);
3370 if (ret) {
3371 btrfs_warn(fs_info, "failed to resume dev_replace");
3372 goto out;
3373 }
3374
3375 btrfs_qgroup_rescan_resume(fs_info);
3376
3377 if (!fs_info->uuid_root) {
3378 btrfs_info(fs_info, "creating UUID tree");
3379 ret = btrfs_create_uuid_tree(fs_info);
3380 if (ret) {
3381 btrfs_warn(fs_info,
3382 "failed to create the UUID tree %d", ret);
3383 goto out;
3384 }
3385 }
3386
3387out:
3388 return ret;
3389}
3390
3391/*
3392 * Do various sanity and dependency checks of different features.
3393 *
3394 * @is_rw_mount: If the mount is read-write.
3395 *
3396 * This is the place for less strict checks (like for subpage or artificial
3397 * feature dependencies).
3398 *
3399 * For strict checks or possible corruption detection, see
3400 * btrfs_validate_super().
3401 *
3402 * This should be called after btrfs_parse_options(), as some mount options
3403 * (space cache related) can modify on-disk format like free space tree and
3404 * screw up certain feature dependencies.
3405 */
3406int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount)
3407{
3408 struct btrfs_super_block *disk_super = fs_info->super_copy;
3409 u64 incompat = btrfs_super_incompat_flags(disk_super);
3410 const u64 compat_ro = btrfs_super_compat_ro_flags(disk_super);
3411 const u64 compat_ro_unsupp = (compat_ro & ~BTRFS_FEATURE_COMPAT_RO_SUPP);
3412
3413 if (incompat & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
3414 btrfs_err(fs_info,
3415 "cannot mount because of unknown incompat features (0x%llx)",
3416 incompat);
3417 return -EINVAL;
3418 }
3419
3420 /* Runtime limitation for mixed block groups. */
3421 if ((incompat & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
3422 (fs_info->sectorsize != fs_info->nodesize)) {
3423 btrfs_err(fs_info,
3424"unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
3425 fs_info->nodesize, fs_info->sectorsize);
3426 return -EINVAL;
3427 }
3428
3429 /* Mixed backref is an always-enabled feature. */
3430 incompat |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
3431
3432 /* Set compression related flags just in case. */
3433 if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
3434 incompat |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
3435 else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD)
3436 incompat |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD;
3437
3438 /*
3439 * An ancient flag, which should really be marked deprecated.
3440 * Such runtime limitation doesn't really need a incompat flag.
3441 */
3442 if (btrfs_super_nodesize(disk_super) > PAGE_SIZE)
3443 incompat |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
3444
3445 if (compat_ro_unsupp && is_rw_mount) {
3446 btrfs_err(fs_info,
3447 "cannot mount read-write because of unknown compat_ro features (0x%llx)",
3448 compat_ro);
3449 return -EINVAL;
3450 }
3451
3452 /*
3453 * We have unsupported RO compat features, although RO mounted, we
3454 * should not cause any metadata writes, including log replay.
3455 * Or we could screw up whatever the new feature requires.
3456 */
3457 if (compat_ro_unsupp && btrfs_super_log_root(disk_super) &&
3458 !btrfs_test_opt(fs_info, NOLOGREPLAY)) {
3459 btrfs_err(fs_info,
3460"cannot replay dirty log with unsupported compat_ro features (0x%llx), try rescue=nologreplay",
3461 compat_ro);
3462 return -EINVAL;
3463 }
3464
3465 /*
3466 * Artificial limitations for block group tree, to force
3467 * block-group-tree to rely on no-holes and free-space-tree.
3468 */
3469 if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE) &&
3470 (!btrfs_fs_incompat(fs_info, NO_HOLES) ||
3471 !btrfs_test_opt(fs_info, FREE_SPACE_TREE))) {
3472 btrfs_err(fs_info,
3473"block-group-tree feature requires no-holes and free-space-tree features");
3474 return -EINVAL;
3475 }
3476
3477 /*
3478 * Subpage runtime limitation on v1 cache.
3479 *
3480 * V1 space cache still has some hard codeed PAGE_SIZE usage, while
3481 * we're already defaulting to v2 cache, no need to bother v1 as it's
3482 * going to be deprecated anyway.
3483 */
3484 if (fs_info->sectorsize < PAGE_SIZE && btrfs_test_opt(fs_info, SPACE_CACHE)) {
3485 btrfs_warn(fs_info,
3486 "v1 space cache is not supported for page size %lu with sectorsize %u",
3487 PAGE_SIZE, fs_info->sectorsize);
3488 return -EINVAL;
3489 }
3490
3491 /* This can be called by remount, we need to protect the super block. */
3492 spin_lock(&fs_info->super_lock);
3493 btrfs_set_super_incompat_flags(disk_super, incompat);
3494 spin_unlock(&fs_info->super_lock);
3495
3496 return 0;
3497}
3498
3499int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices,
3500 char *options)
3501{
3502 u32 sectorsize;
3503 u32 nodesize;
3504 u32 stripesize;
3505 u64 generation;
3506 u64 features;
3507 u16 csum_type;
3508 struct btrfs_super_block *disk_super;
3509 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
3510 struct btrfs_root *tree_root;
3511 struct btrfs_root *chunk_root;
3512 int ret;
3513 int err = -EINVAL;
3514 int level;
3515
3516 ret = init_mount_fs_info(fs_info, sb);
3517 if (ret) {
3518 err = ret;
3519 goto fail;
3520 }
3521
3522 /* These need to be init'ed before we start creating inodes and such. */
3523 tree_root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID,
3524 GFP_KERNEL);
3525 fs_info->tree_root = tree_root;
3526 chunk_root = btrfs_alloc_root(fs_info, BTRFS_CHUNK_TREE_OBJECTID,
3527 GFP_KERNEL);
3528 fs_info->chunk_root = chunk_root;
3529 if (!tree_root || !chunk_root) {
3530 err = -ENOMEM;
3531 goto fail;
3532 }
3533
3534 fs_info->btree_inode = new_inode(sb);
3535 if (!fs_info->btree_inode) {
3536 err = -ENOMEM;
3537 goto fail;
3538 }
3539 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
3540 btrfs_init_btree_inode(fs_info);
3541
3542 invalidate_bdev(fs_devices->latest_dev->bdev);
3543
3544 /*
3545 * Read super block and check the signature bytes only
3546 */
3547 disk_super = btrfs_read_dev_super(fs_devices->latest_dev->bdev);
3548 if (IS_ERR(disk_super)) {
3549 err = PTR_ERR(disk_super);
3550 goto fail_alloc;
3551 }
3552
3553 /*
3554 * Verify the type first, if that or the checksum value are
3555 * corrupted, we'll find out
3556 */
3557 csum_type = btrfs_super_csum_type(disk_super);
3558 if (!btrfs_supported_super_csum(csum_type)) {
3559 btrfs_err(fs_info, "unsupported checksum algorithm: %u",
3560 csum_type);
3561 err = -EINVAL;
3562 btrfs_release_disk_super(disk_super);
3563 goto fail_alloc;
3564 }
3565
3566 fs_info->csum_size = btrfs_super_csum_size(disk_super);
3567
3568 ret = btrfs_init_csum_hash(fs_info, csum_type);
3569 if (ret) {
3570 err = ret;
3571 btrfs_release_disk_super(disk_super);
3572 goto fail_alloc;
3573 }
3574
3575 /*
3576 * We want to check superblock checksum, the type is stored inside.
3577 * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
3578 */
3579 if (btrfs_check_super_csum(fs_info, disk_super)) {
3580 btrfs_err(fs_info, "superblock checksum mismatch");
3581 err = -EINVAL;
3582 btrfs_release_disk_super(disk_super);
3583 goto fail_alloc;
3584 }
3585
3586 /*
3587 * super_copy is zeroed at allocation time and we never touch the
3588 * following bytes up to INFO_SIZE, the checksum is calculated from
3589 * the whole block of INFO_SIZE
3590 */
3591 memcpy(fs_info->super_copy, disk_super, sizeof(*fs_info->super_copy));
3592 btrfs_release_disk_super(disk_super);
3593
3594 disk_super = fs_info->super_copy;
3595
3596
3597 features = btrfs_super_flags(disk_super);
3598 if (features & BTRFS_SUPER_FLAG_CHANGING_FSID_V2) {
3599 features &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
3600 btrfs_set_super_flags(disk_super, features);
3601 btrfs_info(fs_info,
3602 "found metadata UUID change in progress flag, clearing");
3603 }
3604
3605 memcpy(fs_info->super_for_commit, fs_info->super_copy,
3606 sizeof(*fs_info->super_for_commit));
3607
3608 ret = btrfs_validate_mount_super(fs_info);
3609 if (ret) {
3610 btrfs_err(fs_info, "superblock contains fatal errors");
3611 err = -EINVAL;
3612 goto fail_alloc;
3613 }
3614
3615 if (!btrfs_super_root(disk_super))
3616 goto fail_alloc;
3617
3618 /* check FS state, whether FS is broken. */
3619 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
3620 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
3621
3622 /*
3623 * In the long term, we'll store the compression type in the super
3624 * block, and it'll be used for per file compression control.
3625 */
3626 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
3627
3628
3629 /* Set up fs_info before parsing mount options */
3630 nodesize = btrfs_super_nodesize(disk_super);
3631 sectorsize = btrfs_super_sectorsize(disk_super);
3632 stripesize = sectorsize;
3633 fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
3634 fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
3635
3636 fs_info->nodesize = nodesize;
3637 fs_info->sectorsize = sectorsize;
3638 fs_info->sectorsize_bits = ilog2(sectorsize);
3639 fs_info->csums_per_leaf = BTRFS_MAX_ITEM_SIZE(fs_info) / fs_info->csum_size;
3640 fs_info->stripesize = stripesize;
3641
3642 ret = btrfs_parse_options(fs_info, options, sb->s_flags);
3643 if (ret) {
3644 err = ret;
3645 goto fail_alloc;
3646 }
3647
3648 ret = btrfs_check_features(fs_info, !sb_rdonly(sb));
3649 if (ret < 0) {
3650 err = ret;
3651 goto fail_alloc;
3652 }
3653
3654 if (sectorsize < PAGE_SIZE) {
3655 struct btrfs_subpage_info *subpage_info;
3656
3657 /*
3658 * V1 space cache has some hardcoded PAGE_SIZE usage, and is
3659 * going to be deprecated.
3660 *
3661 * Force to use v2 cache for subpage case.
3662 */
3663 btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE);
3664 btrfs_set_and_info(fs_info, FREE_SPACE_TREE,
3665 "forcing free space tree for sector size %u with page size %lu",
3666 sectorsize, PAGE_SIZE);
3667
3668 btrfs_warn(fs_info,
3669 "read-write for sector size %u with page size %lu is experimental",
3670 sectorsize, PAGE_SIZE);
3671 subpage_info = kzalloc(sizeof(*subpage_info), GFP_KERNEL);
3672 if (!subpage_info)
3673 goto fail_alloc;
3674 btrfs_init_subpage_info(subpage_info, sectorsize);
3675 fs_info->subpage_info = subpage_info;
3676 }
3677
3678 ret = btrfs_init_workqueues(fs_info);
3679 if (ret) {
3680 err = ret;
3681 goto fail_sb_buffer;
3682 }
3683
3684 sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
3685 sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
3686
3687 sb->s_blocksize = sectorsize;
3688 sb->s_blocksize_bits = blksize_bits(sectorsize);
3689 memcpy(&sb->s_uuid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE);
3690
3691 mutex_lock(&fs_info->chunk_mutex);
3692 ret = btrfs_read_sys_array(fs_info);
3693 mutex_unlock(&fs_info->chunk_mutex);
3694 if (ret) {
3695 btrfs_err(fs_info, "failed to read the system array: %d", ret);
3696 goto fail_sb_buffer;
3697 }
3698
3699 generation = btrfs_super_chunk_root_generation(disk_super);
3700 level = btrfs_super_chunk_root_level(disk_super);
3701 ret = load_super_root(chunk_root, btrfs_super_chunk_root(disk_super),
3702 generation, level);
3703 if (ret) {
3704 btrfs_err(fs_info, "failed to read chunk root");
3705 goto fail_tree_roots;
3706 }
3707
3708 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
3709 offsetof(struct btrfs_header, chunk_tree_uuid),
3710 BTRFS_UUID_SIZE);
3711
3712 ret = btrfs_read_chunk_tree(fs_info);
3713 if (ret) {
3714 btrfs_err(fs_info, "failed to read chunk tree: %d", ret);
3715 goto fail_tree_roots;
3716 }
3717
3718 /*
3719 * At this point we know all the devices that make this filesystem,
3720 * including the seed devices but we don't know yet if the replace
3721 * target is required. So free devices that are not part of this
3722 * filesystem but skip the replace target device which is checked
3723 * below in btrfs_init_dev_replace().
3724 */
3725 btrfs_free_extra_devids(fs_devices);
3726 if (!fs_devices->latest_dev->bdev) {
3727 btrfs_err(fs_info, "failed to read devices");
3728 goto fail_tree_roots;
3729 }
3730
3731 ret = init_tree_roots(fs_info);
3732 if (ret)
3733 goto fail_tree_roots;
3734
3735 /*
3736 * Get zone type information of zoned block devices. This will also
3737 * handle emulation of a zoned filesystem if a regular device has the
3738 * zoned incompat feature flag set.
3739 */
3740 ret = btrfs_get_dev_zone_info_all_devices(fs_info);
3741 if (ret) {
3742 btrfs_err(fs_info,
3743 "zoned: failed to read device zone info: %d",
3744 ret);
3745 goto fail_block_groups;
3746 }
3747
3748 /*
3749 * If we have a uuid root and we're not being told to rescan we need to
3750 * check the generation here so we can set the
3751 * BTRFS_FS_UPDATE_UUID_TREE_GEN bit. Otherwise we could commit the
3752 * transaction during a balance or the log replay without updating the
3753 * uuid generation, and then if we crash we would rescan the uuid tree,
3754 * even though it was perfectly fine.
3755 */
3756 if (fs_info->uuid_root && !btrfs_test_opt(fs_info, RESCAN_UUID_TREE) &&
3757 fs_info->generation == btrfs_super_uuid_tree_generation(disk_super))
3758 set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
3759
3760 ret = btrfs_verify_dev_extents(fs_info);
3761 if (ret) {
3762 btrfs_err(fs_info,
3763 "failed to verify dev extents against chunks: %d",
3764 ret);
3765 goto fail_block_groups;
3766 }
3767 ret = btrfs_recover_balance(fs_info);
3768 if (ret) {
3769 btrfs_err(fs_info, "failed to recover balance: %d", ret);
3770 goto fail_block_groups;
3771 }
3772
3773 ret = btrfs_init_dev_stats(fs_info);
3774 if (ret) {
3775 btrfs_err(fs_info, "failed to init dev_stats: %d", ret);
3776 goto fail_block_groups;
3777 }
3778
3779 ret = btrfs_init_dev_replace(fs_info);
3780 if (ret) {
3781 btrfs_err(fs_info, "failed to init dev_replace: %d", ret);
3782 goto fail_block_groups;
3783 }
3784
3785 ret = btrfs_check_zoned_mode(fs_info);
3786 if (ret) {
3787 btrfs_err(fs_info, "failed to initialize zoned mode: %d",
3788 ret);
3789 goto fail_block_groups;
3790 }
3791
3792 ret = btrfs_sysfs_add_fsid(fs_devices);
3793 if (ret) {
3794 btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
3795 ret);
3796 goto fail_block_groups;
3797 }
3798
3799 ret = btrfs_sysfs_add_mounted(fs_info);
3800 if (ret) {
3801 btrfs_err(fs_info, "failed to init sysfs interface: %d", ret);
3802 goto fail_fsdev_sysfs;
3803 }
3804
3805 ret = btrfs_init_space_info(fs_info);
3806 if (ret) {
3807 btrfs_err(fs_info, "failed to initialize space info: %d", ret);
3808 goto fail_sysfs;
3809 }
3810
3811 ret = btrfs_read_block_groups(fs_info);
3812 if (ret) {
3813 btrfs_err(fs_info, "failed to read block groups: %d", ret);
3814 goto fail_sysfs;
3815 }
3816
3817 btrfs_free_zone_cache(fs_info);
3818
3819 if (!sb_rdonly(sb) && fs_info->fs_devices->missing_devices &&
3820 !btrfs_check_rw_degradable(fs_info, NULL)) {
3821 btrfs_warn(fs_info,
3822 "writable mount is not allowed due to too many missing devices");
3823 goto fail_sysfs;
3824 }
3825
3826 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, fs_info,
3827 "btrfs-cleaner");
3828 if (IS_ERR(fs_info->cleaner_kthread))
3829 goto fail_sysfs;
3830
3831 fs_info->transaction_kthread = kthread_run(transaction_kthread,
3832 tree_root,
3833 "btrfs-transaction");
3834 if (IS_ERR(fs_info->transaction_kthread))
3835 goto fail_cleaner;
3836
3837 if (!btrfs_test_opt(fs_info, NOSSD) &&
3838 !fs_info->fs_devices->rotating) {
3839 btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
3840 }
3841
3842 /*
3843 * For devices supporting discard turn on discard=async automatically,
3844 * unless it's already set or disabled. This could be turned off by
3845 * nodiscard for the same mount.
3846 */
3847 if (!(btrfs_test_opt(fs_info, DISCARD_SYNC) ||
3848 btrfs_test_opt(fs_info, DISCARD_ASYNC) ||
3849 btrfs_test_opt(fs_info, NODISCARD)) &&
3850 fs_info->fs_devices->discardable) {
3851 btrfs_set_and_info(fs_info, DISCARD_ASYNC,
3852 "auto enabling async discard");
3853 btrfs_clear_opt(fs_info->mount_opt, NODISCARD);
3854 }
3855
3856#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3857 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY)) {
3858 ret = btrfsic_mount(fs_info, fs_devices,
3859 btrfs_test_opt(fs_info,
3860 CHECK_INTEGRITY_DATA) ? 1 : 0,
3861 fs_info->check_integrity_print_mask);
3862 if (ret)
3863 btrfs_warn(fs_info,
3864 "failed to initialize integrity check module: %d",
3865 ret);
3866 }
3867#endif
3868 ret = btrfs_read_qgroup_config(fs_info);
3869 if (ret)
3870 goto fail_trans_kthread;
3871
3872 if (btrfs_build_ref_tree(fs_info))
3873 btrfs_err(fs_info, "couldn't build ref tree");
3874
3875 /* do not make disk changes in broken FS or nologreplay is given */
3876 if (btrfs_super_log_root(disk_super) != 0 &&
3877 !btrfs_test_opt(fs_info, NOLOGREPLAY)) {
3878 btrfs_info(fs_info, "start tree-log replay");
3879 ret = btrfs_replay_log(fs_info, fs_devices);
3880 if (ret) {
3881 err = ret;
3882 goto fail_qgroup;
3883 }
3884 }
3885
3886 fs_info->fs_root = btrfs_get_fs_root(fs_info, BTRFS_FS_TREE_OBJECTID, true);
3887 if (IS_ERR(fs_info->fs_root)) {
3888 err = PTR_ERR(fs_info->fs_root);
3889 btrfs_warn(fs_info, "failed to read fs tree: %d", err);
3890 fs_info->fs_root = NULL;
3891 goto fail_qgroup;
3892 }
3893
3894 if (sb_rdonly(sb))
3895 goto clear_oneshot;
3896
3897 ret = btrfs_start_pre_rw_mount(fs_info);
3898 if (ret) {
3899 close_ctree(fs_info);
3900 return ret;
3901 }
3902 btrfs_discard_resume(fs_info);
3903
3904 if (fs_info->uuid_root &&
3905 (btrfs_test_opt(fs_info, RESCAN_UUID_TREE) ||
3906 fs_info->generation != btrfs_super_uuid_tree_generation(disk_super))) {
3907 btrfs_info(fs_info, "checking UUID tree");
3908 ret = btrfs_check_uuid_tree(fs_info);
3909 if (ret) {
3910 btrfs_warn(fs_info,
3911 "failed to check the UUID tree: %d", ret);
3912 close_ctree(fs_info);
3913 return ret;
3914 }
3915 }
3916
3917 set_bit(BTRFS_FS_OPEN, &fs_info->flags);
3918
3919 /* Kick the cleaner thread so it'll start deleting snapshots. */
3920 if (test_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags))
3921 wake_up_process(fs_info->cleaner_kthread);
3922
3923clear_oneshot:
3924 btrfs_clear_oneshot_options(fs_info);
3925 return 0;
3926
3927fail_qgroup:
3928 btrfs_free_qgroup_config(fs_info);
3929fail_trans_kthread:
3930 kthread_stop(fs_info->transaction_kthread);
3931 btrfs_cleanup_transaction(fs_info);
3932 btrfs_free_fs_roots(fs_info);
3933fail_cleaner:
3934 kthread_stop(fs_info->cleaner_kthread);
3935
3936 /*
3937 * make sure we're done with the btree inode before we stop our
3938 * kthreads
3939 */
3940 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
3941
3942fail_sysfs:
3943 btrfs_sysfs_remove_mounted(fs_info);
3944
3945fail_fsdev_sysfs:
3946 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
3947
3948fail_block_groups:
3949 btrfs_put_block_group_cache(fs_info);
3950
3951fail_tree_roots:
3952 if (fs_info->data_reloc_root)
3953 btrfs_drop_and_free_fs_root(fs_info, fs_info->data_reloc_root);
3954 free_root_pointers(fs_info, true);
3955 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
3956
3957fail_sb_buffer:
3958 btrfs_stop_all_workers(fs_info);
3959 btrfs_free_block_groups(fs_info);
3960fail_alloc:
3961 btrfs_mapping_tree_free(&fs_info->mapping_tree);
3962
3963 iput(fs_info->btree_inode);
3964fail:
3965 btrfs_close_devices(fs_info->fs_devices);
3966 return err;
3967}
3968ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
3969
3970static void btrfs_end_super_write(struct bio *bio)
3971{
3972 struct btrfs_device *device = bio->bi_private;
3973 struct bio_vec *bvec;
3974 struct bvec_iter_all iter_all;
3975 struct page *page;
3976
3977 bio_for_each_segment_all(bvec, bio, iter_all) {
3978 page = bvec->bv_page;
3979
3980 if (bio->bi_status) {
3981 btrfs_warn_rl_in_rcu(device->fs_info,
3982 "lost page write due to IO error on %s (%d)",
3983 btrfs_dev_name(device),
3984 blk_status_to_errno(bio->bi_status));
3985 ClearPageUptodate(page);
3986 SetPageError(page);
3987 btrfs_dev_stat_inc_and_print(device,
3988 BTRFS_DEV_STAT_WRITE_ERRS);
3989 } else {
3990 SetPageUptodate(page);
3991 }
3992
3993 put_page(page);
3994 unlock_page(page);
3995 }
3996
3997 bio_put(bio);
3998}
3999
4000struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
4001 int copy_num, bool drop_cache)
4002{
4003 struct btrfs_super_block *super;
4004 struct page *page;
4005 u64 bytenr, bytenr_orig;
4006 struct address_space *mapping = bdev->bd_inode->i_mapping;
4007 int ret;
4008
4009 bytenr_orig = btrfs_sb_offset(copy_num);
4010 ret = btrfs_sb_log_location_bdev(bdev, copy_num, READ, &bytenr);
4011 if (ret == -ENOENT)
4012 return ERR_PTR(-EINVAL);
4013 else if (ret)
4014 return ERR_PTR(ret);
4015
4016 if (bytenr + BTRFS_SUPER_INFO_SIZE >= bdev_nr_bytes(bdev))
4017 return ERR_PTR(-EINVAL);
4018
4019 if (drop_cache) {
4020 /* This should only be called with the primary sb. */
4021 ASSERT(copy_num == 0);
4022
4023 /*
4024 * Drop the page of the primary superblock, so later read will
4025 * always read from the device.
4026 */
4027 invalidate_inode_pages2_range(mapping,
4028 bytenr >> PAGE_SHIFT,
4029 (bytenr + BTRFS_SUPER_INFO_SIZE) >> PAGE_SHIFT);
4030 }
4031
4032 page = read_cache_page_gfp(mapping, bytenr >> PAGE_SHIFT, GFP_NOFS);
4033 if (IS_ERR(page))
4034 return ERR_CAST(page);
4035
4036 super = page_address(page);
4037 if (btrfs_super_magic(super) != BTRFS_MAGIC) {
4038 btrfs_release_disk_super(super);
4039 return ERR_PTR(-ENODATA);
4040 }
4041
4042 if (btrfs_super_bytenr(super) != bytenr_orig) {
4043 btrfs_release_disk_super(super);
4044 return ERR_PTR(-EINVAL);
4045 }
4046
4047 return super;
4048}
4049
4050
4051struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev)
4052{
4053 struct btrfs_super_block *super, *latest = NULL;
4054 int i;
4055 u64 transid = 0;
4056
4057 /* we would like to check all the supers, but that would make
4058 * a btrfs mount succeed after a mkfs from a different FS.
4059 * So, we need to add a special mount option to scan for
4060 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
4061 */
4062 for (i = 0; i < 1; i++) {
4063 super = btrfs_read_dev_one_super(bdev, i, false);
4064 if (IS_ERR(super))
4065 continue;
4066
4067 if (!latest || btrfs_super_generation(super) > transid) {
4068 if (latest)
4069 btrfs_release_disk_super(super);
4070
4071 latest = super;
4072 transid = btrfs_super_generation(super);
4073 }
4074 }
4075
4076 return super;
4077}
4078
4079/*
4080 * Write superblock @sb to the @device. Do not wait for completion, all the
4081 * pages we use for writing are locked.
4082 *
4083 * Write @max_mirrors copies of the superblock, where 0 means default that fit
4084 * the expected device size at commit time. Note that max_mirrors must be
4085 * same for write and wait phases.
4086 *
4087 * Return number of errors when page is not found or submission fails.
4088 */
4089static int write_dev_supers(struct btrfs_device *device,
4090 struct btrfs_super_block *sb, int max_mirrors)
4091{
4092 struct btrfs_fs_info *fs_info = device->fs_info;
4093 struct address_space *mapping = device->bdev->bd_inode->i_mapping;
4094 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
4095 int i;
4096 int errors = 0;
4097 int ret;
4098 u64 bytenr, bytenr_orig;
4099
4100 if (max_mirrors == 0)
4101 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
4102
4103 shash->tfm = fs_info->csum_shash;
4104
4105 for (i = 0; i < max_mirrors; i++) {
4106 struct page *page;
4107 struct bio *bio;
4108 struct btrfs_super_block *disk_super;
4109
4110 bytenr_orig = btrfs_sb_offset(i);
4111 ret = btrfs_sb_log_location(device, i, WRITE, &bytenr);
4112 if (ret == -ENOENT) {
4113 continue;
4114 } else if (ret < 0) {
4115 btrfs_err(device->fs_info,
4116 "couldn't get super block location for mirror %d",
4117 i);
4118 errors++;
4119 continue;
4120 }
4121 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
4122 device->commit_total_bytes)
4123 break;
4124
4125 btrfs_set_super_bytenr(sb, bytenr_orig);
4126
4127 crypto_shash_digest(shash, (const char *)sb + BTRFS_CSUM_SIZE,
4128 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE,
4129 sb->csum);
4130
4131 page = find_or_create_page(mapping, bytenr >> PAGE_SHIFT,
4132 GFP_NOFS);
4133 if (!page) {
4134 btrfs_err(device->fs_info,
4135 "couldn't get super block page for bytenr %llu",
4136 bytenr);
4137 errors++;
4138 continue;
4139 }
4140
4141 /* Bump the refcount for wait_dev_supers() */
4142 get_page(page);
4143
4144 disk_super = page_address(page);
4145 memcpy(disk_super, sb, BTRFS_SUPER_INFO_SIZE);
4146
4147 /*
4148 * Directly use bios here instead of relying on the page cache
4149 * to do I/O, so we don't lose the ability to do integrity
4150 * checking.
4151 */
4152 bio = bio_alloc(device->bdev, 1,
4153 REQ_OP_WRITE | REQ_SYNC | REQ_META | REQ_PRIO,
4154 GFP_NOFS);
4155 bio->bi_iter.bi_sector = bytenr >> SECTOR_SHIFT;
4156 bio->bi_private = device;
4157 bio->bi_end_io = btrfs_end_super_write;
4158 __bio_add_page(bio, page, BTRFS_SUPER_INFO_SIZE,
4159 offset_in_page(bytenr));
4160
4161 /*
4162 * We FUA only the first super block. The others we allow to
4163 * go down lazy and there's a short window where the on-disk
4164 * copies might still contain the older version.
4165 */
4166 if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER))
4167 bio->bi_opf |= REQ_FUA;
4168
4169 btrfsic_check_bio(bio);
4170 submit_bio(bio);
4171
4172 if (btrfs_advance_sb_log(device, i))
4173 errors++;
4174 }
4175 return errors < i ? 0 : -1;
4176}
4177
4178/*
4179 * Wait for write completion of superblocks done by write_dev_supers,
4180 * @max_mirrors same for write and wait phases.
4181 *
4182 * Return number of errors when page is not found or not marked up to
4183 * date.
4184 */
4185static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
4186{
4187 int i;
4188 int errors = 0;
4189 bool primary_failed = false;
4190 int ret;
4191 u64 bytenr;
4192
4193 if (max_mirrors == 0)
4194 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
4195
4196 for (i = 0; i < max_mirrors; i++) {
4197 struct page *page;
4198
4199 ret = btrfs_sb_log_location(device, i, READ, &bytenr);
4200 if (ret == -ENOENT) {
4201 break;
4202 } else if (ret < 0) {
4203 errors++;
4204 if (i == 0)
4205 primary_failed = true;
4206 continue;
4207 }
4208 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
4209 device->commit_total_bytes)
4210 break;
4211
4212 page = find_get_page(device->bdev->bd_inode->i_mapping,
4213 bytenr >> PAGE_SHIFT);
4214 if (!page) {
4215 errors++;
4216 if (i == 0)
4217 primary_failed = true;
4218 continue;
4219 }
4220 /* Page is submitted locked and unlocked once the IO completes */
4221 wait_on_page_locked(page);
4222 if (PageError(page)) {
4223 errors++;
4224 if (i == 0)
4225 primary_failed = true;
4226 }
4227
4228 /* Drop our reference */
4229 put_page(page);
4230
4231 /* Drop the reference from the writing run */
4232 put_page(page);
4233 }
4234
4235 /* log error, force error return */
4236 if (primary_failed) {
4237 btrfs_err(device->fs_info, "error writing primary super block to device %llu",
4238 device->devid);
4239 return -1;
4240 }
4241
4242 return errors < i ? 0 : -1;
4243}
4244
4245/*
4246 * endio for the write_dev_flush, this will wake anyone waiting
4247 * for the barrier when it is done
4248 */
4249static void btrfs_end_empty_barrier(struct bio *bio)
4250{
4251 bio_uninit(bio);
4252 complete(bio->bi_private);
4253}
4254
4255/*
4256 * Submit a flush request to the device if it supports it. Error handling is
4257 * done in the waiting counterpart.
4258 */
4259static void write_dev_flush(struct btrfs_device *device)
4260{
4261 struct bio *bio = &device->flush_bio;
4262
4263#ifndef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4264 /*
4265 * When a disk has write caching disabled, we skip submission of a bio
4266 * with flush and sync requests before writing the superblock, since
4267 * it's not needed. However when the integrity checker is enabled, this
4268 * results in reports that there are metadata blocks referred by a
4269 * superblock that were not properly flushed. So don't skip the bio
4270 * submission only when the integrity checker is enabled for the sake
4271 * of simplicity, since this is a debug tool and not meant for use in
4272 * non-debug builds.
4273 */
4274 if (!bdev_write_cache(device->bdev))
4275 return;
4276#endif
4277
4278 bio_init(bio, device->bdev, NULL, 0,
4279 REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH);
4280 bio->bi_end_io = btrfs_end_empty_barrier;
4281 init_completion(&device->flush_wait);
4282 bio->bi_private = &device->flush_wait;
4283
4284 btrfsic_check_bio(bio);
4285 submit_bio(bio);
4286 set_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
4287}
4288
4289/*
4290 * If the flush bio has been submitted by write_dev_flush, wait for it.
4291 */
4292static blk_status_t wait_dev_flush(struct btrfs_device *device)
4293{
4294 struct bio *bio = &device->flush_bio;
4295
4296 if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
4297 return BLK_STS_OK;
4298
4299 clear_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
4300 wait_for_completion_io(&device->flush_wait);
4301
4302 return bio->bi_status;
4303}
4304
4305static int check_barrier_error(struct btrfs_fs_info *fs_info)
4306{
4307 if (!btrfs_check_rw_degradable(fs_info, NULL))
4308 return -EIO;
4309 return 0;
4310}
4311
4312/*
4313 * send an empty flush down to each device in parallel,
4314 * then wait for them
4315 */
4316static int barrier_all_devices(struct btrfs_fs_info *info)
4317{
4318 struct list_head *head;
4319 struct btrfs_device *dev;
4320 int errors_wait = 0;
4321 blk_status_t ret;
4322
4323 lockdep_assert_held(&info->fs_devices->device_list_mutex);
4324 /* send down all the barriers */
4325 head = &info->fs_devices->devices;
4326 list_for_each_entry(dev, head, dev_list) {
4327 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
4328 continue;
4329 if (!dev->bdev)
4330 continue;
4331 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4332 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4333 continue;
4334
4335 write_dev_flush(dev);
4336 dev->last_flush_error = BLK_STS_OK;
4337 }
4338
4339 /* wait for all the barriers */
4340 list_for_each_entry(dev, head, dev_list) {
4341 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
4342 continue;
4343 if (!dev->bdev) {
4344 errors_wait++;
4345 continue;
4346 }
4347 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4348 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4349 continue;
4350
4351 ret = wait_dev_flush(dev);
4352 if (ret) {
4353 dev->last_flush_error = ret;
4354 btrfs_dev_stat_inc_and_print(dev,
4355 BTRFS_DEV_STAT_FLUSH_ERRS);
4356 errors_wait++;
4357 }
4358 }
4359
4360 if (errors_wait) {
4361 /*
4362 * At some point we need the status of all disks
4363 * to arrive at the volume status. So error checking
4364 * is being pushed to a separate loop.
4365 */
4366 return check_barrier_error(info);
4367 }
4368 return 0;
4369}
4370
4371int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
4372{
4373 int raid_type;
4374 int min_tolerated = INT_MAX;
4375
4376 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 ||
4377 (flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE))
4378 min_tolerated = min_t(int, min_tolerated,
4379 btrfs_raid_array[BTRFS_RAID_SINGLE].
4380 tolerated_failures);
4381
4382 for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
4383 if (raid_type == BTRFS_RAID_SINGLE)
4384 continue;
4385 if (!(flags & btrfs_raid_array[raid_type].bg_flag))
4386 continue;
4387 min_tolerated = min_t(int, min_tolerated,
4388 btrfs_raid_array[raid_type].
4389 tolerated_failures);
4390 }
4391
4392 if (min_tolerated == INT_MAX) {
4393 pr_warn("BTRFS: unknown raid flag: %llu", flags);
4394 min_tolerated = 0;
4395 }
4396
4397 return min_tolerated;
4398}
4399
4400int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
4401{
4402 struct list_head *head;
4403 struct btrfs_device *dev;
4404 struct btrfs_super_block *sb;
4405 struct btrfs_dev_item *dev_item;
4406 int ret;
4407 int do_barriers;
4408 int max_errors;
4409 int total_errors = 0;
4410 u64 flags;
4411
4412 do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);
4413
4414 /*
4415 * max_mirrors == 0 indicates we're from commit_transaction,
4416 * not from fsync where the tree roots in fs_info have not
4417 * been consistent on disk.
4418 */
4419 if (max_mirrors == 0)
4420 backup_super_roots(fs_info);
4421
4422 sb = fs_info->super_for_commit;
4423 dev_item = &sb->dev_item;
4424
4425 mutex_lock(&fs_info->fs_devices->device_list_mutex);
4426 head = &fs_info->fs_devices->devices;
4427 max_errors = btrfs_super_num_devices(fs_info->super_copy) - 1;
4428
4429 if (do_barriers) {
4430 ret = barrier_all_devices(fs_info);
4431 if (ret) {
4432 mutex_unlock(
4433 &fs_info->fs_devices->device_list_mutex);
4434 btrfs_handle_fs_error(fs_info, ret,
4435 "errors while submitting device barriers.");
4436 return ret;
4437 }
4438 }
4439
4440 list_for_each_entry(dev, head, dev_list) {
4441 if (!dev->bdev) {
4442 total_errors++;
4443 continue;
4444 }
4445 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4446 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4447 continue;
4448
4449 btrfs_set_stack_device_generation(dev_item, 0);
4450 btrfs_set_stack_device_type(dev_item, dev->type);
4451 btrfs_set_stack_device_id(dev_item, dev->devid);
4452 btrfs_set_stack_device_total_bytes(dev_item,
4453 dev->commit_total_bytes);
4454 btrfs_set_stack_device_bytes_used(dev_item,
4455 dev->commit_bytes_used);
4456 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
4457 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
4458 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
4459 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
4460 memcpy(dev_item->fsid, dev->fs_devices->metadata_uuid,
4461 BTRFS_FSID_SIZE);
4462
4463 flags = btrfs_super_flags(sb);
4464 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
4465
4466 ret = btrfs_validate_write_super(fs_info, sb);
4467 if (ret < 0) {
4468 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4469 btrfs_handle_fs_error(fs_info, -EUCLEAN,
4470 "unexpected superblock corruption detected");
4471 return -EUCLEAN;
4472 }
4473
4474 ret = write_dev_supers(dev, sb, max_mirrors);
4475 if (ret)
4476 total_errors++;
4477 }
4478 if (total_errors > max_errors) {
4479 btrfs_err(fs_info, "%d errors while writing supers",
4480 total_errors);
4481 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4482
4483 /* FUA is masked off if unsupported and can't be the reason */
4484 btrfs_handle_fs_error(fs_info, -EIO,
4485 "%d errors while writing supers",
4486 total_errors);
4487 return -EIO;
4488 }
4489
4490 total_errors = 0;
4491 list_for_each_entry(dev, head, dev_list) {
4492 if (!dev->bdev)
4493 continue;
4494 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4495 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4496 continue;
4497
4498 ret = wait_dev_supers(dev, max_mirrors);
4499 if (ret)
4500 total_errors++;
4501 }
4502 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4503 if (total_errors > max_errors) {
4504 btrfs_handle_fs_error(fs_info, -EIO,
4505 "%d errors while writing supers",
4506 total_errors);
4507 return -EIO;
4508 }
4509 return 0;
4510}
4511
4512/* Drop a fs root from the radix tree and free it. */
4513void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
4514 struct btrfs_root *root)
4515{
4516 bool drop_ref = false;
4517
4518 spin_lock(&fs_info->fs_roots_radix_lock);
4519 radix_tree_delete(&fs_info->fs_roots_radix,
4520 (unsigned long)root->root_key.objectid);
4521 if (test_and_clear_bit(BTRFS_ROOT_IN_RADIX, &root->state))
4522 drop_ref = true;
4523 spin_unlock(&fs_info->fs_roots_radix_lock);
4524
4525 if (BTRFS_FS_ERROR(fs_info)) {
4526 ASSERT(root->log_root == NULL);
4527 if (root->reloc_root) {
4528 btrfs_put_root(root->reloc_root);
4529 root->reloc_root = NULL;
4530 }
4531 }
4532
4533 if (drop_ref)
4534 btrfs_put_root(root);
4535}
4536
4537int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
4538{
4539 u64 root_objectid = 0;
4540 struct btrfs_root *gang[8];
4541 int i = 0;
4542 int err = 0;
4543 unsigned int ret = 0;
4544
4545 while (1) {
4546 spin_lock(&fs_info->fs_roots_radix_lock);
4547 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
4548 (void **)gang, root_objectid,
4549 ARRAY_SIZE(gang));
4550 if (!ret) {
4551 spin_unlock(&fs_info->fs_roots_radix_lock);
4552 break;
4553 }
4554 root_objectid = gang[ret - 1]->root_key.objectid + 1;
4555
4556 for (i = 0; i < ret; i++) {
4557 /* Avoid to grab roots in dead_roots */
4558 if (btrfs_root_refs(&gang[i]->root_item) == 0) {
4559 gang[i] = NULL;
4560 continue;
4561 }
4562 /* grab all the search result for later use */
4563 gang[i] = btrfs_grab_root(gang[i]);
4564 }
4565 spin_unlock(&fs_info->fs_roots_radix_lock);
4566
4567 for (i = 0; i < ret; i++) {
4568 if (!gang[i])
4569 continue;
4570 root_objectid = gang[i]->root_key.objectid;
4571 err = btrfs_orphan_cleanup(gang[i]);
4572 if (err)
4573 break;
4574 btrfs_put_root(gang[i]);
4575 }
4576 root_objectid++;
4577 }
4578
4579 /* release the uncleaned roots due to error */
4580 for (; i < ret; i++) {
4581 if (gang[i])
4582 btrfs_put_root(gang[i]);
4583 }
4584 return err;
4585}
4586
4587int btrfs_commit_super(struct btrfs_fs_info *fs_info)
4588{
4589 struct btrfs_root *root = fs_info->tree_root;
4590 struct btrfs_trans_handle *trans;
4591
4592 mutex_lock(&fs_info->cleaner_mutex);
4593 btrfs_run_delayed_iputs(fs_info);
4594 mutex_unlock(&fs_info->cleaner_mutex);
4595 wake_up_process(fs_info->cleaner_kthread);
4596
4597 /* wait until ongoing cleanup work done */
4598 down_write(&fs_info->cleanup_work_sem);
4599 up_write(&fs_info->cleanup_work_sem);
4600
4601 trans = btrfs_join_transaction(root);
4602 if (IS_ERR(trans))
4603 return PTR_ERR(trans);
4604 return btrfs_commit_transaction(trans);
4605}
4606
4607static void warn_about_uncommitted_trans(struct btrfs_fs_info *fs_info)
4608{
4609 struct btrfs_transaction *trans;
4610 struct btrfs_transaction *tmp;
4611 bool found = false;
4612
4613 if (list_empty(&fs_info->trans_list))
4614 return;
4615
4616 /*
4617 * This function is only called at the very end of close_ctree(),
4618 * thus no other running transaction, no need to take trans_lock.
4619 */
4620 ASSERT(test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags));
4621 list_for_each_entry_safe(trans, tmp, &fs_info->trans_list, list) {
4622 struct extent_state *cached = NULL;
4623 u64 dirty_bytes = 0;
4624 u64 cur = 0;
4625 u64 found_start;
4626 u64 found_end;
4627
4628 found = true;
4629 while (!find_first_extent_bit(&trans->dirty_pages, cur,
4630 &found_start, &found_end, EXTENT_DIRTY, &cached)) {
4631 dirty_bytes += found_end + 1 - found_start;
4632 cur = found_end + 1;
4633 }
4634 btrfs_warn(fs_info,
4635 "transaction %llu (with %llu dirty metadata bytes) is not committed",
4636 trans->transid, dirty_bytes);
4637 btrfs_cleanup_one_transaction(trans, fs_info);
4638
4639 if (trans == fs_info->running_transaction)
4640 fs_info->running_transaction = NULL;
4641 list_del_init(&trans->list);
4642
4643 btrfs_put_transaction(trans);
4644 trace_btrfs_transaction_commit(fs_info);
4645 }
4646 ASSERT(!found);
4647}
4648
4649void __cold close_ctree(struct btrfs_fs_info *fs_info)
4650{
4651 int ret;
4652
4653 set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
4654
4655 /*
4656 * If we had UNFINISHED_DROPS we could still be processing them, so
4657 * clear that bit and wake up relocation so it can stop.
4658 * We must do this before stopping the block group reclaim task, because
4659 * at btrfs_relocate_block_group() we wait for this bit, and after the
4660 * wait we stop with -EINTR if btrfs_fs_closing() returns non-zero - we
4661 * have just set BTRFS_FS_CLOSING_START, so btrfs_fs_closing() will
4662 * return 1.
4663 */
4664 btrfs_wake_unfinished_drop(fs_info);
4665
4666 /*
4667 * We may have the reclaim task running and relocating a data block group,
4668 * in which case it may create delayed iputs. So stop it before we park
4669 * the cleaner kthread otherwise we can get new delayed iputs after
4670 * parking the cleaner, and that can make the async reclaim task to hang
4671 * if it's waiting for delayed iputs to complete, since the cleaner is
4672 * parked and can not run delayed iputs - this will make us hang when
4673 * trying to stop the async reclaim task.
4674 */
4675 cancel_work_sync(&fs_info->reclaim_bgs_work);
4676 /*
4677 * We don't want the cleaner to start new transactions, add more delayed
4678 * iputs, etc. while we're closing. We can't use kthread_stop() yet
4679 * because that frees the task_struct, and the transaction kthread might
4680 * still try to wake up the cleaner.
4681 */
4682 kthread_park(fs_info->cleaner_kthread);
4683
4684 /* wait for the qgroup rescan worker to stop */
4685 btrfs_qgroup_wait_for_completion(fs_info, false);
4686
4687 /* wait for the uuid_scan task to finish */
4688 down(&fs_info->uuid_tree_rescan_sem);
4689 /* avoid complains from lockdep et al., set sem back to initial state */
4690 up(&fs_info->uuid_tree_rescan_sem);
4691
4692 /* pause restriper - we want to resume on mount */
4693 btrfs_pause_balance(fs_info);
4694
4695 btrfs_dev_replace_suspend_for_unmount(fs_info);
4696
4697 btrfs_scrub_cancel(fs_info);
4698
4699 /* wait for any defraggers to finish */
4700 wait_event(fs_info->transaction_wait,
4701 (atomic_read(&fs_info->defrag_running) == 0));
4702
4703 /* clear out the rbtree of defraggable inodes */
4704 btrfs_cleanup_defrag_inodes(fs_info);
4705
4706 /*
4707 * After we parked the cleaner kthread, ordered extents may have
4708 * completed and created new delayed iputs. If one of the async reclaim
4709 * tasks is running and in the RUN_DELAYED_IPUTS flush state, then we
4710 * can hang forever trying to stop it, because if a delayed iput is
4711 * added after it ran btrfs_run_delayed_iputs() and before it called
4712 * btrfs_wait_on_delayed_iputs(), it will hang forever since there is
4713 * no one else to run iputs.
4714 *
4715 * So wait for all ongoing ordered extents to complete and then run
4716 * delayed iputs. This works because once we reach this point no one
4717 * can either create new ordered extents nor create delayed iputs
4718 * through some other means.
4719 *
4720 * Also note that btrfs_wait_ordered_roots() is not safe here, because
4721 * it waits for BTRFS_ORDERED_COMPLETE to be set on an ordered extent,
4722 * but the delayed iput for the respective inode is made only when doing
4723 * the final btrfs_put_ordered_extent() (which must happen at
4724 * btrfs_finish_ordered_io() when we are unmounting).
4725 */
4726 btrfs_flush_workqueue(fs_info->endio_write_workers);
4727 /* Ordered extents for free space inodes. */
4728 btrfs_flush_workqueue(fs_info->endio_freespace_worker);
4729 btrfs_run_delayed_iputs(fs_info);
4730
4731 cancel_work_sync(&fs_info->async_reclaim_work);
4732 cancel_work_sync(&fs_info->async_data_reclaim_work);
4733 cancel_work_sync(&fs_info->preempt_reclaim_work);
4734
4735 /* Cancel or finish ongoing discard work */
4736 btrfs_discard_cleanup(fs_info);
4737
4738 if (!sb_rdonly(fs_info->sb)) {
4739 /*
4740 * The cleaner kthread is stopped, so do one final pass over
4741 * unused block groups.
4742 */
4743 btrfs_delete_unused_bgs(fs_info);
4744
4745 /*
4746 * There might be existing delayed inode workers still running
4747 * and holding an empty delayed inode item. We must wait for
4748 * them to complete first because they can create a transaction.
4749 * This happens when someone calls btrfs_balance_delayed_items()
4750 * and then a transaction commit runs the same delayed nodes
4751 * before any delayed worker has done something with the nodes.
4752 * We must wait for any worker here and not at transaction
4753 * commit time since that could cause a deadlock.
4754 * This is a very rare case.
4755 */
4756 btrfs_flush_workqueue(fs_info->delayed_workers);
4757
4758 ret = btrfs_commit_super(fs_info);
4759 if (ret)
4760 btrfs_err(fs_info, "commit super ret %d", ret);
4761 }
4762
4763 if (BTRFS_FS_ERROR(fs_info))
4764 btrfs_error_commit_super(fs_info);
4765
4766 kthread_stop(fs_info->transaction_kthread);
4767 kthread_stop(fs_info->cleaner_kthread);
4768
4769 ASSERT(list_empty(&fs_info->delayed_iputs));
4770 set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
4771
4772 if (btrfs_check_quota_leak(fs_info)) {
4773 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
4774 btrfs_err(fs_info, "qgroup reserved space leaked");
4775 }
4776
4777 btrfs_free_qgroup_config(fs_info);
4778 ASSERT(list_empty(&fs_info->delalloc_roots));
4779
4780 if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
4781 btrfs_info(fs_info, "at unmount delalloc count %lld",
4782 percpu_counter_sum(&fs_info->delalloc_bytes));
4783 }
4784
4785 if (percpu_counter_sum(&fs_info->ordered_bytes))
4786 btrfs_info(fs_info, "at unmount dio bytes count %lld",
4787 percpu_counter_sum(&fs_info->ordered_bytes));
4788
4789 btrfs_sysfs_remove_mounted(fs_info);
4790 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
4791
4792 btrfs_put_block_group_cache(fs_info);
4793
4794 /*
4795 * we must make sure there is not any read request to
4796 * submit after we stopping all workers.
4797 */
4798 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
4799 btrfs_stop_all_workers(fs_info);
4800
4801 /* We shouldn't have any transaction open at this point */
4802 warn_about_uncommitted_trans(fs_info);
4803
4804 clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
4805 free_root_pointers(fs_info, true);
4806 btrfs_free_fs_roots(fs_info);
4807
4808 /*
4809 * We must free the block groups after dropping the fs_roots as we could
4810 * have had an IO error and have left over tree log blocks that aren't
4811 * cleaned up until the fs roots are freed. This makes the block group
4812 * accounting appear to be wrong because there's pending reserved bytes,
4813 * so make sure we do the block group cleanup afterwards.
4814 */
4815 btrfs_free_block_groups(fs_info);
4816
4817 iput(fs_info->btree_inode);
4818
4819#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4820 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY))
4821 btrfsic_unmount(fs_info->fs_devices);
4822#endif
4823
4824 btrfs_mapping_tree_free(&fs_info->mapping_tree);
4825 btrfs_close_devices(fs_info->fs_devices);
4826}
4827
4828int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
4829 int atomic)
4830{
4831 int ret;
4832 struct inode *btree_inode = buf->pages[0]->mapping->host;
4833
4834 ret = extent_buffer_uptodate(buf);
4835 if (!ret)
4836 return ret;
4837
4838 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
4839 parent_transid, atomic);
4840 if (ret == -EAGAIN)
4841 return ret;
4842 return !ret;
4843}
4844
4845void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
4846{
4847 struct btrfs_fs_info *fs_info = buf->fs_info;
4848 u64 transid = btrfs_header_generation(buf);
4849 int was_dirty;
4850
4851#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4852 /*
4853 * This is a fast path so only do this check if we have sanity tests
4854 * enabled. Normal people shouldn't be using unmapped buffers as dirty
4855 * outside of the sanity tests.
4856 */
4857 if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &buf->bflags)))
4858 return;
4859#endif
4860 btrfs_assert_tree_write_locked(buf);
4861 if (transid != fs_info->generation)
4862 WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n",
4863 buf->start, transid, fs_info->generation);
4864 was_dirty = set_extent_buffer_dirty(buf);
4865 if (!was_dirty)
4866 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
4867 buf->len,
4868 fs_info->dirty_metadata_batch);
4869#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4870 /*
4871 * Since btrfs_mark_buffer_dirty() can be called with item pointer set
4872 * but item data not updated.
4873 * So here we should only check item pointers, not item data.
4874 */
4875 if (btrfs_header_level(buf) == 0 &&
4876 btrfs_check_leaf_relaxed(buf)) {
4877 btrfs_print_leaf(buf);
4878 ASSERT(0);
4879 }
4880#endif
4881}
4882
4883static void __btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info,
4884 int flush_delayed)
4885{
4886 /*
4887 * looks as though older kernels can get into trouble with
4888 * this code, they end up stuck in balance_dirty_pages forever
4889 */
4890 int ret;
4891
4892 if (current->flags & PF_MEMALLOC)
4893 return;
4894
4895 if (flush_delayed)
4896 btrfs_balance_delayed_items(fs_info);
4897
4898 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
4899 BTRFS_DIRTY_METADATA_THRESH,
4900 fs_info->dirty_metadata_batch);
4901 if (ret > 0) {
4902 balance_dirty_pages_ratelimited(fs_info->btree_inode->i_mapping);
4903 }
4904}
4905
4906void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info)
4907{
4908 __btrfs_btree_balance_dirty(fs_info, 1);
4909}
4910
4911void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info)
4912{
4913 __btrfs_btree_balance_dirty(fs_info, 0);
4914}
4915
4916static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info)
4917{
4918 /* cleanup FS via transaction */
4919 btrfs_cleanup_transaction(fs_info);
4920
4921 mutex_lock(&fs_info->cleaner_mutex);
4922 btrfs_run_delayed_iputs(fs_info);
4923 mutex_unlock(&fs_info->cleaner_mutex);
4924
4925 down_write(&fs_info->cleanup_work_sem);
4926 up_write(&fs_info->cleanup_work_sem);
4927}
4928
4929static void btrfs_drop_all_logs(struct btrfs_fs_info *fs_info)
4930{
4931 struct btrfs_root *gang[8];
4932 u64 root_objectid = 0;
4933 int ret;
4934
4935 spin_lock(&fs_info->fs_roots_radix_lock);
4936 while ((ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
4937 (void **)gang, root_objectid,
4938 ARRAY_SIZE(gang))) != 0) {
4939 int i;
4940
4941 for (i = 0; i < ret; i++)
4942 gang[i] = btrfs_grab_root(gang[i]);
4943 spin_unlock(&fs_info->fs_roots_radix_lock);
4944
4945 for (i = 0; i < ret; i++) {
4946 if (!gang[i])
4947 continue;
4948 root_objectid = gang[i]->root_key.objectid;
4949 btrfs_free_log(NULL, gang[i]);
4950 btrfs_put_root(gang[i]);
4951 }
4952 root_objectid++;
4953 spin_lock(&fs_info->fs_roots_radix_lock);
4954 }
4955 spin_unlock(&fs_info->fs_roots_radix_lock);
4956 btrfs_free_log_root_tree(NULL, fs_info);
4957}
4958
4959static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
4960{
4961 struct btrfs_ordered_extent *ordered;
4962
4963 spin_lock(&root->ordered_extent_lock);
4964 /*
4965 * This will just short circuit the ordered completion stuff which will
4966 * make sure the ordered extent gets properly cleaned up.
4967 */
4968 list_for_each_entry(ordered, &root->ordered_extents,
4969 root_extent_list)
4970 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
4971 spin_unlock(&root->ordered_extent_lock);
4972}
4973
4974static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
4975{
4976 struct btrfs_root *root;
4977 struct list_head splice;
4978
4979 INIT_LIST_HEAD(&splice);
4980
4981 spin_lock(&fs_info->ordered_root_lock);
4982 list_splice_init(&fs_info->ordered_roots, &splice);
4983 while (!list_empty(&splice)) {
4984 root = list_first_entry(&splice, struct btrfs_root,
4985 ordered_root);
4986 list_move_tail(&root->ordered_root,
4987 &fs_info->ordered_roots);
4988
4989 spin_unlock(&fs_info->ordered_root_lock);
4990 btrfs_destroy_ordered_extents(root);
4991
4992 cond_resched();
4993 spin_lock(&fs_info->ordered_root_lock);
4994 }
4995 spin_unlock(&fs_info->ordered_root_lock);
4996
4997 /*
4998 * We need this here because if we've been flipped read-only we won't
4999 * get sync() from the umount, so we need to make sure any ordered
5000 * extents that haven't had their dirty pages IO start writeout yet
5001 * actually get run and error out properly.
5002 */
5003 btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
5004}
5005
5006static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
5007 struct btrfs_fs_info *fs_info)
5008{
5009 struct rb_node *node;
5010 struct btrfs_delayed_ref_root *delayed_refs;
5011 struct btrfs_delayed_ref_node *ref;
5012 int ret = 0;
5013
5014 delayed_refs = &trans->delayed_refs;
5015
5016 spin_lock(&delayed_refs->lock);
5017 if (atomic_read(&delayed_refs->num_entries) == 0) {
5018 spin_unlock(&delayed_refs->lock);
5019 btrfs_debug(fs_info, "delayed_refs has NO entry");
5020 return ret;
5021 }
5022
5023 while ((node = rb_first_cached(&delayed_refs->href_root)) != NULL) {
5024 struct btrfs_delayed_ref_head *head;
5025 struct rb_node *n;
5026 bool pin_bytes = false;
5027
5028 head = rb_entry(node, struct btrfs_delayed_ref_head,
5029 href_node);
5030 if (btrfs_delayed_ref_lock(delayed_refs, head))
5031 continue;
5032
5033 spin_lock(&head->lock);
5034 while ((n = rb_first_cached(&head->ref_tree)) != NULL) {
5035 ref = rb_entry(n, struct btrfs_delayed_ref_node,
5036 ref_node);
5037 ref->in_tree = 0;
5038 rb_erase_cached(&ref->ref_node, &head->ref_tree);
5039 RB_CLEAR_NODE(&ref->ref_node);
5040 if (!list_empty(&ref->add_list))
5041 list_del(&ref->add_list);
5042 atomic_dec(&delayed_refs->num_entries);
5043 btrfs_put_delayed_ref(ref);
5044 }
5045 if (head->must_insert_reserved)
5046 pin_bytes = true;
5047 btrfs_free_delayed_extent_op(head->extent_op);
5048 btrfs_delete_ref_head(delayed_refs, head);
5049 spin_unlock(&head->lock);
5050 spin_unlock(&delayed_refs->lock);
5051 mutex_unlock(&head->mutex);
5052
5053 if (pin_bytes) {
5054 struct btrfs_block_group *cache;
5055
5056 cache = btrfs_lookup_block_group(fs_info, head->bytenr);
5057 BUG_ON(!cache);
5058
5059 spin_lock(&cache->space_info->lock);
5060 spin_lock(&cache->lock);
5061 cache->pinned += head->num_bytes;
5062 btrfs_space_info_update_bytes_pinned(fs_info,
5063 cache->space_info, head->num_bytes);
5064 cache->reserved -= head->num_bytes;
5065 cache->space_info->bytes_reserved -= head->num_bytes;
5066 spin_unlock(&cache->lock);
5067 spin_unlock(&cache->space_info->lock);
5068
5069 btrfs_put_block_group(cache);
5070
5071 btrfs_error_unpin_extent_range(fs_info, head->bytenr,
5072 head->bytenr + head->num_bytes - 1);
5073 }
5074 btrfs_cleanup_ref_head_accounting(fs_info, delayed_refs, head);
5075 btrfs_put_delayed_ref_head(head);
5076 cond_resched();
5077 spin_lock(&delayed_refs->lock);
5078 }
5079 btrfs_qgroup_destroy_extent_records(trans);
5080
5081 spin_unlock(&delayed_refs->lock);
5082
5083 return ret;
5084}
5085
5086static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
5087{
5088 struct btrfs_inode *btrfs_inode;
5089 struct list_head splice;
5090
5091 INIT_LIST_HEAD(&splice);
5092
5093 spin_lock(&root->delalloc_lock);
5094 list_splice_init(&root->delalloc_inodes, &splice);
5095
5096 while (!list_empty(&splice)) {
5097 struct inode *inode = NULL;
5098 btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
5099 delalloc_inodes);
5100 __btrfs_del_delalloc_inode(root, btrfs_inode);
5101 spin_unlock(&root->delalloc_lock);
5102
5103 /*
5104 * Make sure we get a live inode and that it'll not disappear
5105 * meanwhile.
5106 */
5107 inode = igrab(&btrfs_inode->vfs_inode);
5108 if (inode) {
5109 invalidate_inode_pages2(inode->i_mapping);
5110 iput(inode);
5111 }
5112 spin_lock(&root->delalloc_lock);
5113 }
5114 spin_unlock(&root->delalloc_lock);
5115}
5116
5117static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
5118{
5119 struct btrfs_root *root;
5120 struct list_head splice;
5121
5122 INIT_LIST_HEAD(&splice);
5123
5124 spin_lock(&fs_info->delalloc_root_lock);
5125 list_splice_init(&fs_info->delalloc_roots, &splice);
5126 while (!list_empty(&splice)) {
5127 root = list_first_entry(&splice, struct btrfs_root,
5128 delalloc_root);
5129 root = btrfs_grab_root(root);
5130 BUG_ON(!root);
5131 spin_unlock(&fs_info->delalloc_root_lock);
5132
5133 btrfs_destroy_delalloc_inodes(root);
5134 btrfs_put_root(root);
5135
5136 spin_lock(&fs_info->delalloc_root_lock);
5137 }
5138 spin_unlock(&fs_info->delalloc_root_lock);
5139}
5140
5141static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
5142 struct extent_io_tree *dirty_pages,
5143 int mark)
5144{
5145 int ret;
5146 struct extent_buffer *eb;
5147 u64 start = 0;
5148 u64 end;
5149
5150 while (1) {
5151 ret = find_first_extent_bit(dirty_pages, start, &start, &end,
5152 mark, NULL);
5153 if (ret)
5154 break;
5155
5156 clear_extent_bits(dirty_pages, start, end, mark);
5157 while (start <= end) {
5158 eb = find_extent_buffer(fs_info, start);
5159 start += fs_info->nodesize;
5160 if (!eb)
5161 continue;
5162 wait_on_extent_buffer_writeback(eb);
5163
5164 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
5165 &eb->bflags))
5166 clear_extent_buffer_dirty(eb);
5167 free_extent_buffer_stale(eb);
5168 }
5169 }
5170
5171 return ret;
5172}
5173
5174static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
5175 struct extent_io_tree *unpin)
5176{
5177 u64 start;
5178 u64 end;
5179 int ret;
5180
5181 while (1) {
5182 struct extent_state *cached_state = NULL;
5183
5184 /*
5185 * The btrfs_finish_extent_commit() may get the same range as
5186 * ours between find_first_extent_bit and clear_extent_dirty.
5187 * Hence, hold the unused_bg_unpin_mutex to avoid double unpin
5188 * the same extent range.
5189 */
5190 mutex_lock(&fs_info->unused_bg_unpin_mutex);
5191 ret = find_first_extent_bit(unpin, 0, &start, &end,
5192 EXTENT_DIRTY, &cached_state);
5193 if (ret) {
5194 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
5195 break;
5196 }
5197
5198 clear_extent_dirty(unpin, start, end, &cached_state);
5199 free_extent_state(cached_state);
5200 btrfs_error_unpin_extent_range(fs_info, start, end);
5201 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
5202 cond_resched();
5203 }
5204
5205 return 0;
5206}
5207
5208static void btrfs_cleanup_bg_io(struct btrfs_block_group *cache)
5209{
5210 struct inode *inode;
5211
5212 inode = cache->io_ctl.inode;
5213 if (inode) {
5214 invalidate_inode_pages2(inode->i_mapping);
5215 BTRFS_I(inode)->generation = 0;
5216 cache->io_ctl.inode = NULL;
5217 iput(inode);
5218 }
5219 ASSERT(cache->io_ctl.pages == NULL);
5220 btrfs_put_block_group(cache);
5221}
5222
5223void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
5224 struct btrfs_fs_info *fs_info)
5225{
5226 struct btrfs_block_group *cache;
5227
5228 spin_lock(&cur_trans->dirty_bgs_lock);
5229 while (!list_empty(&cur_trans->dirty_bgs)) {
5230 cache = list_first_entry(&cur_trans->dirty_bgs,
5231 struct btrfs_block_group,
5232 dirty_list);
5233
5234 if (!list_empty(&cache->io_list)) {
5235 spin_unlock(&cur_trans->dirty_bgs_lock);
5236 list_del_init(&cache->io_list);
5237 btrfs_cleanup_bg_io(cache);
5238 spin_lock(&cur_trans->dirty_bgs_lock);
5239 }
5240
5241 list_del_init(&cache->dirty_list);
5242 spin_lock(&cache->lock);
5243 cache->disk_cache_state = BTRFS_DC_ERROR;
5244 spin_unlock(&cache->lock);
5245
5246 spin_unlock(&cur_trans->dirty_bgs_lock);
5247 btrfs_put_block_group(cache);
5248 btrfs_delayed_refs_rsv_release(fs_info, 1);
5249 spin_lock(&cur_trans->dirty_bgs_lock);
5250 }
5251 spin_unlock(&cur_trans->dirty_bgs_lock);
5252
5253 /*
5254 * Refer to the definition of io_bgs member for details why it's safe
5255 * to use it without any locking
5256 */
5257 while (!list_empty(&cur_trans->io_bgs)) {
5258 cache = list_first_entry(&cur_trans->io_bgs,
5259 struct btrfs_block_group,
5260 io_list);
5261
5262 list_del_init(&cache->io_list);
5263 spin_lock(&cache->lock);
5264 cache->disk_cache_state = BTRFS_DC_ERROR;
5265 spin_unlock(&cache->lock);
5266 btrfs_cleanup_bg_io(cache);
5267 }
5268}
5269
5270void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
5271 struct btrfs_fs_info *fs_info)
5272{
5273 struct btrfs_device *dev, *tmp;
5274
5275 btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
5276 ASSERT(list_empty(&cur_trans->dirty_bgs));
5277 ASSERT(list_empty(&cur_trans->io_bgs));
5278
5279 list_for_each_entry_safe(dev, tmp, &cur_trans->dev_update_list,
5280 post_commit_list) {
5281 list_del_init(&dev->post_commit_list);
5282 }
5283
5284 btrfs_destroy_delayed_refs(cur_trans, fs_info);
5285
5286 cur_trans->state = TRANS_STATE_COMMIT_START;
5287 wake_up(&fs_info->transaction_blocked_wait);
5288
5289 cur_trans->state = TRANS_STATE_UNBLOCKED;
5290 wake_up(&fs_info->transaction_wait);
5291
5292 btrfs_destroy_delayed_inodes(fs_info);
5293
5294 btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
5295 EXTENT_DIRTY);
5296 btrfs_destroy_pinned_extent(fs_info, &cur_trans->pinned_extents);
5297
5298 btrfs_free_redirty_list(cur_trans);
5299
5300 cur_trans->state =TRANS_STATE_COMPLETED;
5301 wake_up(&cur_trans->commit_wait);
5302}
5303
5304static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
5305{
5306 struct btrfs_transaction *t;
5307
5308 mutex_lock(&fs_info->transaction_kthread_mutex);
5309
5310 spin_lock(&fs_info->trans_lock);
5311 while (!list_empty(&fs_info->trans_list)) {
5312 t = list_first_entry(&fs_info->trans_list,
5313 struct btrfs_transaction, list);
5314 if (t->state >= TRANS_STATE_COMMIT_START) {
5315 refcount_inc(&t->use_count);
5316 spin_unlock(&fs_info->trans_lock);
5317 btrfs_wait_for_commit(fs_info, t->transid);
5318 btrfs_put_transaction(t);
5319 spin_lock(&fs_info->trans_lock);
5320 continue;
5321 }
5322 if (t == fs_info->running_transaction) {
5323 t->state = TRANS_STATE_COMMIT_DOING;
5324 spin_unlock(&fs_info->trans_lock);
5325 /*
5326 * We wait for 0 num_writers since we don't hold a trans
5327 * handle open currently for this transaction.
5328 */
5329 wait_event(t->writer_wait,
5330 atomic_read(&t->num_writers) == 0);
5331 } else {
5332 spin_unlock(&fs_info->trans_lock);
5333 }
5334 btrfs_cleanup_one_transaction(t, fs_info);
5335
5336 spin_lock(&fs_info->trans_lock);
5337 if (t == fs_info->running_transaction)
5338 fs_info->running_transaction = NULL;
5339 list_del_init(&t->list);
5340 spin_unlock(&fs_info->trans_lock);
5341
5342 btrfs_put_transaction(t);
5343 trace_btrfs_transaction_commit(fs_info);
5344 spin_lock(&fs_info->trans_lock);
5345 }
5346 spin_unlock(&fs_info->trans_lock);
5347 btrfs_destroy_all_ordered_extents(fs_info);
5348 btrfs_destroy_delayed_inodes(fs_info);
5349 btrfs_assert_delayed_root_empty(fs_info);
5350 btrfs_destroy_all_delalloc_inodes(fs_info);
5351 btrfs_drop_all_logs(fs_info);
5352 mutex_unlock(&fs_info->transaction_kthread_mutex);
5353
5354 return 0;
5355}
5356
5357int btrfs_init_root_free_objectid(struct btrfs_root *root)
5358{
5359 struct btrfs_path *path;
5360 int ret;
5361 struct extent_buffer *l;
5362 struct btrfs_key search_key;
5363 struct btrfs_key found_key;
5364 int slot;
5365
5366 path = btrfs_alloc_path();
5367 if (!path)
5368 return -ENOMEM;
5369
5370 search_key.objectid = BTRFS_LAST_FREE_OBJECTID;
5371 search_key.type = -1;
5372 search_key.offset = (u64)-1;
5373 ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
5374 if (ret < 0)
5375 goto error;
5376 BUG_ON(ret == 0); /* Corruption */
5377 if (path->slots[0] > 0) {
5378 slot = path->slots[0] - 1;
5379 l = path->nodes[0];
5380 btrfs_item_key_to_cpu(l, &found_key, slot);
5381 root->free_objectid = max_t(u64, found_key.objectid + 1,
5382 BTRFS_FIRST_FREE_OBJECTID);
5383 } else {
5384 root->free_objectid = BTRFS_FIRST_FREE_OBJECTID;
5385 }
5386 ret = 0;
5387error:
5388 btrfs_free_path(path);
5389 return ret;
5390}
5391
5392int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid)
5393{
5394 int ret;
5395 mutex_lock(&root->objectid_mutex);
5396
5397 if (unlikely(root->free_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
5398 btrfs_warn(root->fs_info,
5399 "the objectid of root %llu reaches its highest value",
5400 root->root_key.objectid);
5401 ret = -ENOSPC;
5402 goto out;
5403 }
5404
5405 *objectid = root->free_objectid++;
5406 ret = 0;
5407out:
5408 mutex_unlock(&root->objectid_mutex);
5409 return ret;
5410}