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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
44#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
45 BTRFS_HEADER_FLAG_RELOC |\
46 BTRFS_SUPER_FLAG_ERROR |\
47 BTRFS_SUPER_FLAG_SEEDING |\
48 BTRFS_SUPER_FLAG_METADUMP |\
49 BTRFS_SUPER_FLAG_METADUMP_V2)
50
51static const struct extent_io_ops btree_extent_io_ops;
52static void end_workqueue_fn(struct btrfs_work *work);
53static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
54static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
55 struct btrfs_fs_info *fs_info);
56static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
57static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
58 struct extent_io_tree *dirty_pages,
59 int mark);
60static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
61 struct extent_io_tree *pinned_extents);
62static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info);
63static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info);
64
65
66
67
68
69
70struct btrfs_end_io_wq {
71 struct bio *bio;
72 bio_end_io_t *end_io;
73 void *private;
74 struct btrfs_fs_info *info;
75 blk_status_t status;
76 enum btrfs_wq_endio_type metadata;
77 struct btrfs_work work;
78};
79
80static struct kmem_cache *btrfs_end_io_wq_cache;
81
82int __init btrfs_end_io_wq_init(void)
83{
84 btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq",
85 sizeof(struct btrfs_end_io_wq),
86 0,
87 SLAB_MEM_SPREAD,
88 NULL);
89 if (!btrfs_end_io_wq_cache)
90 return -ENOMEM;
91 return 0;
92}
93
94void __cold btrfs_end_io_wq_exit(void)
95{
96 kmem_cache_destroy(btrfs_end_io_wq_cache);
97}
98
99
100
101
102
103
104struct async_submit_bio {
105 void *private_data;
106 struct bio *bio;
107 extent_submit_bio_start_t *submit_bio_start;
108 int mirror_num;
109
110
111
112
113 u64 bio_offset;
114 struct btrfs_work work;
115 blk_status_t status;
116};
117
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139
140
141#ifdef CONFIG_DEBUG_LOCK_ALLOC
142# if BTRFS_MAX_LEVEL != 8
143# error
144# endif
145
146static struct btrfs_lockdep_keyset {
147 u64 id;
148 const char *name_stem;
149 char names[BTRFS_MAX_LEVEL + 1][20];
150 struct lock_class_key keys[BTRFS_MAX_LEVEL + 1];
151} btrfs_lockdep_keysets[] = {
152 { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" },
153 { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" },
154 { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" },
155 { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" },
156 { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" },
157 { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" },
158 { .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" },
159 { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" },
160 { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" },
161 { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" },
162 { .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" },
163 { .id = BTRFS_FREE_SPACE_TREE_OBJECTID, .name_stem = "free-space" },
164 { .id = 0, .name_stem = "tree" },
165};
166
167void __init btrfs_init_lockdep(void)
168{
169 int i, j;
170
171
172 for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) {
173 struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i];
174
175 for (j = 0; j < ARRAY_SIZE(ks->names); j++)
176 snprintf(ks->names[j], sizeof(ks->names[j]),
177 "btrfs-%s-%02d", ks->name_stem, j);
178 }
179}
180
181void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
182 int level)
183{
184 struct btrfs_lockdep_keyset *ks;
185
186 BUG_ON(level >= ARRAY_SIZE(ks->keys));
187
188
189 for (ks = btrfs_lockdep_keysets; ks->id; ks++)
190 if (ks->id == objectid)
191 break;
192
193 lockdep_set_class_and_name(&eb->lock,
194 &ks->keys[level], ks->names[level]);
195}
196
197#endif
198
199
200
201
202
203struct extent_map *btree_get_extent(struct btrfs_inode *inode,
204 struct page *page, size_t pg_offset, u64 start, u64 len,
205 int create)
206{
207 struct btrfs_fs_info *fs_info = inode->root->fs_info;
208 struct extent_map_tree *em_tree = &inode->extent_tree;
209 struct extent_map *em;
210 int ret;
211
212 read_lock(&em_tree->lock);
213 em = lookup_extent_mapping(em_tree, start, len);
214 if (em) {
215 em->bdev = fs_info->fs_devices->latest_bdev;
216 read_unlock(&em_tree->lock);
217 goto out;
218 }
219 read_unlock(&em_tree->lock);
220
221 em = alloc_extent_map();
222 if (!em) {
223 em = ERR_PTR(-ENOMEM);
224 goto out;
225 }
226 em->start = 0;
227 em->len = (u64)-1;
228 em->block_len = (u64)-1;
229 em->block_start = 0;
230 em->bdev = fs_info->fs_devices->latest_bdev;
231
232 write_lock(&em_tree->lock);
233 ret = add_extent_mapping(em_tree, em, 0);
234 if (ret == -EEXIST) {
235 free_extent_map(em);
236 em = lookup_extent_mapping(em_tree, start, len);
237 if (!em)
238 em = ERR_PTR(-EIO);
239 } else if (ret) {
240 free_extent_map(em);
241 em = ERR_PTR(ret);
242 }
243 write_unlock(&em_tree->lock);
244
245out:
246 return em;
247}
248
249
250
251
252
253
254static int csum_tree_block(struct extent_buffer *buf, u8 *result)
255{
256 struct btrfs_fs_info *fs_info = buf->fs_info;
257 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
258 unsigned long len;
259 unsigned long cur_len;
260 unsigned long offset = BTRFS_CSUM_SIZE;
261 char *kaddr;
262 unsigned long map_start;
263 unsigned long map_len;
264 int err;
265
266 shash->tfm = fs_info->csum_shash;
267 crypto_shash_init(shash);
268
269 len = buf->len - offset;
270
271 while (len > 0) {
272
273
274
275
276
277
278 err = map_private_extent_buffer(buf, offset, 32,
279 &kaddr, &map_start, &map_len);
280 if (WARN_ON(err))
281 return err;
282 cur_len = min(len, map_len - (offset - map_start));
283 crypto_shash_update(shash, kaddr + offset - map_start, cur_len);
284 len -= cur_len;
285 offset += cur_len;
286 }
287 memset(result, 0, BTRFS_CSUM_SIZE);
288
289 crypto_shash_final(shash, result);
290
291 return 0;
292}
293
294
295
296
297
298
299
300static int verify_parent_transid(struct extent_io_tree *io_tree,
301 struct extent_buffer *eb, u64 parent_transid,
302 int atomic)
303{
304 struct extent_state *cached_state = NULL;
305 int ret;
306 bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB);
307
308 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
309 return 0;
310
311 if (atomic)
312 return -EAGAIN;
313
314 if (need_lock) {
315 btrfs_tree_read_lock(eb);
316 btrfs_set_lock_blocking_read(eb);
317 }
318
319 lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
320 &cached_state);
321 if (extent_buffer_uptodate(eb) &&
322 btrfs_header_generation(eb) == parent_transid) {
323 ret = 0;
324 goto out;
325 }
326 btrfs_err_rl(eb->fs_info,
327 "parent transid verify failed on %llu wanted %llu found %llu",
328 eb->start,
329 parent_transid, btrfs_header_generation(eb));
330 ret = 1;
331
332
333
334
335
336
337
338
339
340 if (!extent_buffer_under_io(eb))
341 clear_extent_buffer_uptodate(eb);
342out:
343 unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
344 &cached_state);
345 if (need_lock)
346 btrfs_tree_read_unlock_blocking(eb);
347 return ret;
348}
349
350static bool btrfs_supported_super_csum(u16 csum_type)
351{
352 switch (csum_type) {
353 case BTRFS_CSUM_TYPE_CRC32:
354 return true;
355 default:
356 return false;
357 }
358}
359
360
361
362
363
364static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
365 char *raw_disk_sb)
366{
367 struct btrfs_super_block *disk_sb =
368 (struct btrfs_super_block *)raw_disk_sb;
369 char result[BTRFS_CSUM_SIZE];
370 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
371
372 shash->tfm = fs_info->csum_shash;
373 crypto_shash_init(shash);
374
375
376
377
378
379
380 crypto_shash_update(shash, raw_disk_sb + BTRFS_CSUM_SIZE,
381 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
382 crypto_shash_final(shash, result);
383
384 if (memcmp(disk_sb->csum, result, btrfs_super_csum_size(disk_sb)))
385 return 1;
386
387 return 0;
388}
389
390int btrfs_verify_level_key(struct extent_buffer *eb, int level,
391 struct btrfs_key *first_key, u64 parent_transid)
392{
393 struct btrfs_fs_info *fs_info = eb->fs_info;
394 int found_level;
395 struct btrfs_key found_key;
396 int ret;
397
398 found_level = btrfs_header_level(eb);
399 if (found_level != level) {
400 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
401 KERN_ERR "BTRFS: tree level check failed\n");
402 btrfs_err(fs_info,
403"tree level mismatch detected, bytenr=%llu level expected=%u has=%u",
404 eb->start, level, found_level);
405 return -EIO;
406 }
407
408 if (!first_key)
409 return 0;
410
411
412
413
414
415
416
417 if (btrfs_header_generation(eb) > fs_info->last_trans_committed)
418 return 0;
419 if (found_level)
420 btrfs_node_key_to_cpu(eb, &found_key, 0);
421 else
422 btrfs_item_key_to_cpu(eb, &found_key, 0);
423 ret = btrfs_comp_cpu_keys(first_key, &found_key);
424
425 if (ret) {
426 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
427 KERN_ERR "BTRFS: tree first key check failed\n");
428 btrfs_err(fs_info,
429"tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
430 eb->start, parent_transid, first_key->objectid,
431 first_key->type, first_key->offset,
432 found_key.objectid, found_key.type,
433 found_key.offset);
434 }
435 return ret;
436}
437
438
439
440
441
442
443
444
445
446static int btree_read_extent_buffer_pages(struct extent_buffer *eb,
447 u64 parent_transid, int level,
448 struct btrfs_key *first_key)
449{
450 struct btrfs_fs_info *fs_info = eb->fs_info;
451 struct extent_io_tree *io_tree;
452 int failed = 0;
453 int ret;
454 int num_copies = 0;
455 int mirror_num = 0;
456 int failed_mirror = 0;
457
458 io_tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
459 while (1) {
460 clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
461 ret = read_extent_buffer_pages(eb, WAIT_COMPLETE, mirror_num);
462 if (!ret) {
463 if (verify_parent_transid(io_tree, eb,
464 parent_transid, 0))
465 ret = -EIO;
466 else if (btrfs_verify_level_key(eb, level,
467 first_key, parent_transid))
468 ret = -EUCLEAN;
469 else
470 break;
471 }
472
473 num_copies = btrfs_num_copies(fs_info,
474 eb->start, eb->len);
475 if (num_copies == 1)
476 break;
477
478 if (!failed_mirror) {
479 failed = 1;
480 failed_mirror = eb->read_mirror;
481 }
482
483 mirror_num++;
484 if (mirror_num == failed_mirror)
485 mirror_num++;
486
487 if (mirror_num > num_copies)
488 break;
489 }
490
491 if (failed && !ret && failed_mirror)
492 btrfs_repair_eb_io_failure(eb, failed_mirror);
493
494 return ret;
495}
496
497
498
499
500
501
502static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
503{
504 u64 start = page_offset(page);
505 u64 found_start;
506 u8 result[BTRFS_CSUM_SIZE];
507 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
508 struct extent_buffer *eb;
509 int ret;
510
511 eb = (struct extent_buffer *)page->private;
512 if (page != eb->pages[0])
513 return 0;
514
515 found_start = btrfs_header_bytenr(eb);
516
517
518
519
520 if (WARN_ON(found_start != start))
521 return -EUCLEAN;
522 if (WARN_ON(!PageUptodate(page)))
523 return -EUCLEAN;
524
525 ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
526 btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0);
527
528 if (csum_tree_block(eb, result))
529 return -EINVAL;
530
531 if (btrfs_header_level(eb))
532 ret = btrfs_check_node(eb);
533 else
534 ret = btrfs_check_leaf_full(eb);
535
536 if (ret < 0) {
537 btrfs_err(fs_info,
538 "block=%llu write time tree block corruption detected",
539 eb->start);
540 return ret;
541 }
542 write_extent_buffer(eb, result, 0, csum_size);
543
544 return 0;
545}
546
547static int check_tree_block_fsid(struct extent_buffer *eb)
548{
549 struct btrfs_fs_info *fs_info = eb->fs_info;
550 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
551 u8 fsid[BTRFS_FSID_SIZE];
552 int ret = 1;
553
554 read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
555 while (fs_devices) {
556 u8 *metadata_uuid;
557
558
559
560
561
562
563 if (fs_devices == fs_info->fs_devices &&
564 btrfs_fs_incompat(fs_info, METADATA_UUID))
565 metadata_uuid = fs_devices->metadata_uuid;
566 else
567 metadata_uuid = fs_devices->fsid;
568
569 if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE)) {
570 ret = 0;
571 break;
572 }
573 fs_devices = fs_devices->seed;
574 }
575 return ret;
576}
577
578static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
579 u64 phy_offset, struct page *page,
580 u64 start, u64 end, int mirror)
581{
582 u64 found_start;
583 int found_level;
584 struct extent_buffer *eb;
585 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
586 struct btrfs_fs_info *fs_info = root->fs_info;
587 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
588 int ret = 0;
589 u8 result[BTRFS_CSUM_SIZE];
590 int reads_done;
591
592 if (!page->private)
593 goto out;
594
595 eb = (struct extent_buffer *)page->private;
596
597
598
599
600 extent_buffer_get(eb);
601
602 reads_done = atomic_dec_and_test(&eb->io_pages);
603 if (!reads_done)
604 goto err;
605
606 eb->read_mirror = mirror;
607 if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
608 ret = -EIO;
609 goto err;
610 }
611
612 found_start = btrfs_header_bytenr(eb);
613 if (found_start != eb->start) {
614 btrfs_err_rl(fs_info, "bad tree block start, want %llu have %llu",
615 eb->start, found_start);
616 ret = -EIO;
617 goto err;
618 }
619 if (check_tree_block_fsid(eb)) {
620 btrfs_err_rl(fs_info, "bad fsid on block %llu",
621 eb->start);
622 ret = -EIO;
623 goto err;
624 }
625 found_level = btrfs_header_level(eb);
626 if (found_level >= BTRFS_MAX_LEVEL) {
627 btrfs_err(fs_info, "bad tree block level %d on %llu",
628 (int)btrfs_header_level(eb), eb->start);
629 ret = -EIO;
630 goto err;
631 }
632
633 btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
634 eb, found_level);
635
636 ret = csum_tree_block(eb, result);
637 if (ret)
638 goto err;
639
640 if (memcmp_extent_buffer(eb, result, 0, csum_size)) {
641 u32 val;
642 u32 found = 0;
643
644 memcpy(&found, result, csum_size);
645
646 read_extent_buffer(eb, &val, 0, csum_size);
647 btrfs_warn_rl(fs_info,
648 "%s checksum verify failed on %llu wanted %x found %x level %d",
649 fs_info->sb->s_id, eb->start,
650 val, found, btrfs_header_level(eb));
651 ret = -EUCLEAN;
652 goto err;
653 }
654
655
656
657
658
659
660 if (found_level == 0 && btrfs_check_leaf_full(eb)) {
661 set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
662 ret = -EIO;
663 }
664
665 if (found_level > 0 && btrfs_check_node(eb))
666 ret = -EIO;
667
668 if (!ret)
669 set_extent_buffer_uptodate(eb);
670 else
671 btrfs_err(fs_info,
672 "block=%llu read time tree block corruption detected",
673 eb->start);
674err:
675 if (reads_done &&
676 test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
677 btree_readahead_hook(eb, ret);
678
679 if (ret) {
680
681
682
683
684
685 atomic_inc(&eb->io_pages);
686 clear_extent_buffer_uptodate(eb);
687 }
688 free_extent_buffer(eb);
689out:
690 return ret;
691}
692
693static void end_workqueue_bio(struct bio *bio)
694{
695 struct btrfs_end_io_wq *end_io_wq = bio->bi_private;
696 struct btrfs_fs_info *fs_info;
697 struct btrfs_workqueue *wq;
698 btrfs_work_func_t func;
699
700 fs_info = end_io_wq->info;
701 end_io_wq->status = bio->bi_status;
702
703 if (bio_op(bio) == REQ_OP_WRITE) {
704 if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) {
705 wq = fs_info->endio_meta_write_workers;
706 func = btrfs_endio_meta_write_helper;
707 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) {
708 wq = fs_info->endio_freespace_worker;
709 func = btrfs_freespace_write_helper;
710 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
711 wq = fs_info->endio_raid56_workers;
712 func = btrfs_endio_raid56_helper;
713 } else {
714 wq = fs_info->endio_write_workers;
715 func = btrfs_endio_write_helper;
716 }
717 } else {
718 if (unlikely(end_io_wq->metadata ==
719 BTRFS_WQ_ENDIO_DIO_REPAIR)) {
720 wq = fs_info->endio_repair_workers;
721 func = btrfs_endio_repair_helper;
722 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
723 wq = fs_info->endio_raid56_workers;
724 func = btrfs_endio_raid56_helper;
725 } else if (end_io_wq->metadata) {
726 wq = fs_info->endio_meta_workers;
727 func = btrfs_endio_meta_helper;
728 } else {
729 wq = fs_info->endio_workers;
730 func = btrfs_endio_helper;
731 }
732 }
733
734 btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL);
735 btrfs_queue_work(wq, &end_io_wq->work);
736}
737
738blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
739 enum btrfs_wq_endio_type metadata)
740{
741 struct btrfs_end_io_wq *end_io_wq;
742
743 end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS);
744 if (!end_io_wq)
745 return BLK_STS_RESOURCE;
746
747 end_io_wq->private = bio->bi_private;
748 end_io_wq->end_io = bio->bi_end_io;
749 end_io_wq->info = info;
750 end_io_wq->status = 0;
751 end_io_wq->bio = bio;
752 end_io_wq->metadata = metadata;
753
754 bio->bi_private = end_io_wq;
755 bio->bi_end_io = end_workqueue_bio;
756 return 0;
757}
758
759static void run_one_async_start(struct btrfs_work *work)
760{
761 struct async_submit_bio *async;
762 blk_status_t ret;
763
764 async = container_of(work, struct async_submit_bio, work);
765 ret = async->submit_bio_start(async->private_data, async->bio,
766 async->bio_offset);
767 if (ret)
768 async->status = ret;
769}
770
771
772
773
774
775
776
777
778
779static void run_one_async_done(struct btrfs_work *work)
780{
781 struct async_submit_bio *async;
782 struct inode *inode;
783 blk_status_t ret;
784
785 async = container_of(work, struct async_submit_bio, work);
786 inode = async->private_data;
787
788
789 if (async->status) {
790 async->bio->bi_status = async->status;
791 bio_endio(async->bio);
792 return;
793 }
794
795 ret = btrfs_map_bio(btrfs_sb(inode->i_sb), async->bio,
796 async->mirror_num, 1);
797 if (ret) {
798 async->bio->bi_status = ret;
799 bio_endio(async->bio);
800 }
801}
802
803static void run_one_async_free(struct btrfs_work *work)
804{
805 struct async_submit_bio *async;
806
807 async = container_of(work, struct async_submit_bio, work);
808 kfree(async);
809}
810
811blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
812 int mirror_num, unsigned long bio_flags,
813 u64 bio_offset, void *private_data,
814 extent_submit_bio_start_t *submit_bio_start)
815{
816 struct async_submit_bio *async;
817
818 async = kmalloc(sizeof(*async), GFP_NOFS);
819 if (!async)
820 return BLK_STS_RESOURCE;
821
822 async->private_data = private_data;
823 async->bio = bio;
824 async->mirror_num = mirror_num;
825 async->submit_bio_start = submit_bio_start;
826
827 btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start,
828 run_one_async_done, run_one_async_free);
829
830 async->bio_offset = bio_offset;
831
832 async->status = 0;
833
834 if (op_is_sync(bio->bi_opf))
835 btrfs_set_work_high_priority(&async->work);
836
837 btrfs_queue_work(fs_info->workers, &async->work);
838 return 0;
839}
840
841static blk_status_t btree_csum_one_bio(struct bio *bio)
842{
843 struct bio_vec *bvec;
844 struct btrfs_root *root;
845 int ret = 0;
846 struct bvec_iter_all iter_all;
847
848 ASSERT(!bio_flagged(bio, BIO_CLONED));
849 bio_for_each_segment_all(bvec, bio, iter_all) {
850 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
851 ret = csum_dirty_buffer(root->fs_info, bvec->bv_page);
852 if (ret)
853 break;
854 }
855
856 return errno_to_blk_status(ret);
857}
858
859static blk_status_t btree_submit_bio_start(void *private_data, struct bio *bio,
860 u64 bio_offset)
861{
862
863
864
865
866 return btree_csum_one_bio(bio);
867}
868
869static int check_async_write(struct btrfs_fs_info *fs_info,
870 struct btrfs_inode *bi)
871{
872 if (atomic_read(&bi->sync_writers))
873 return 0;
874 if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags))
875 return 0;
876 return 1;
877}
878
879static blk_status_t btree_submit_bio_hook(struct inode *inode, struct bio *bio,
880 int mirror_num,
881 unsigned long bio_flags)
882{
883 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
884 int async = check_async_write(fs_info, BTRFS_I(inode));
885 blk_status_t ret;
886
887 if (bio_op(bio) != REQ_OP_WRITE) {
888
889
890
891
892 ret = btrfs_bio_wq_end_io(fs_info, bio,
893 BTRFS_WQ_ENDIO_METADATA);
894 if (ret)
895 goto out_w_error;
896 ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
897 } else if (!async) {
898 ret = btree_csum_one_bio(bio);
899 if (ret)
900 goto out_w_error;
901 ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
902 } else {
903
904
905
906
907 ret = btrfs_wq_submit_bio(fs_info, bio, mirror_num, 0,
908 0, inode, btree_submit_bio_start);
909 }
910
911 if (ret)
912 goto out_w_error;
913 return 0;
914
915out_w_error:
916 bio->bi_status = ret;
917 bio_endio(bio);
918 return ret;
919}
920
921#ifdef CONFIG_MIGRATION
922static int btree_migratepage(struct address_space *mapping,
923 struct page *newpage, struct page *page,
924 enum migrate_mode mode)
925{
926
927
928
929
930 if (PageDirty(page))
931 return -EAGAIN;
932
933
934
935
936 if (page_has_private(page) &&
937 !try_to_release_page(page, GFP_KERNEL))
938 return -EAGAIN;
939 return migrate_page(mapping, newpage, page, mode);
940}
941#endif
942
943
944static int btree_writepages(struct address_space *mapping,
945 struct writeback_control *wbc)
946{
947 struct btrfs_fs_info *fs_info;
948 int ret;
949
950 if (wbc->sync_mode == WB_SYNC_NONE) {
951
952 if (wbc->for_kupdate)
953 return 0;
954
955 fs_info = BTRFS_I(mapping->host)->root->fs_info;
956
957 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
958 BTRFS_DIRTY_METADATA_THRESH,
959 fs_info->dirty_metadata_batch);
960 if (ret < 0)
961 return 0;
962 }
963 return btree_write_cache_pages(mapping, wbc);
964}
965
966static int btree_readpage(struct file *file, struct page *page)
967{
968 struct extent_io_tree *tree;
969 tree = &BTRFS_I(page->mapping->host)->io_tree;
970 return extent_read_full_page(tree, page, btree_get_extent, 0);
971}
972
973static int btree_releasepage(struct page *page, gfp_t gfp_flags)
974{
975 if (PageWriteback(page) || PageDirty(page))
976 return 0;
977
978 return try_release_extent_buffer(page);
979}
980
981static void btree_invalidatepage(struct page *page, unsigned int offset,
982 unsigned int length)
983{
984 struct extent_io_tree *tree;
985 tree = &BTRFS_I(page->mapping->host)->io_tree;
986 extent_invalidatepage(tree, page, offset);
987 btree_releasepage(page, GFP_NOFS);
988 if (PagePrivate(page)) {
989 btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info,
990 "page private not zero on page %llu",
991 (unsigned long long)page_offset(page));
992 ClearPagePrivate(page);
993 set_page_private(page, 0);
994 put_page(page);
995 }
996}
997
998static int btree_set_page_dirty(struct page *page)
999{
1000#ifdef DEBUG
1001 struct extent_buffer *eb;
1002
1003 BUG_ON(!PagePrivate(page));
1004 eb = (struct extent_buffer *)page->private;
1005 BUG_ON(!eb);
1006 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
1007 BUG_ON(!atomic_read(&eb->refs));
1008 btrfs_assert_tree_locked(eb);
1009#endif
1010 return __set_page_dirty_nobuffers(page);
1011}
1012
1013static const struct address_space_operations btree_aops = {
1014 .readpage = btree_readpage,
1015 .writepages = btree_writepages,
1016 .releasepage = btree_releasepage,
1017 .invalidatepage = btree_invalidatepage,
1018#ifdef CONFIG_MIGRATION
1019 .migratepage = btree_migratepage,
1020#endif
1021 .set_page_dirty = btree_set_page_dirty,
1022};
1023
1024void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr)
1025{
1026 struct extent_buffer *buf = NULL;
1027 int ret;
1028
1029 buf = btrfs_find_create_tree_block(fs_info, bytenr);
1030 if (IS_ERR(buf))
1031 return;
1032
1033 ret = read_extent_buffer_pages(buf, WAIT_NONE, 0);
1034 if (ret < 0)
1035 free_extent_buffer_stale(buf);
1036 else
1037 free_extent_buffer(buf);
1038}
1039
1040int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr,
1041 int mirror_num, struct extent_buffer **eb)
1042{
1043 struct extent_buffer *buf = NULL;
1044 int ret;
1045
1046 buf = btrfs_find_create_tree_block(fs_info, bytenr);
1047 if (IS_ERR(buf))
1048 return 0;
1049
1050 set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags);
1051
1052 ret = read_extent_buffer_pages(buf, WAIT_PAGE_LOCK, mirror_num);
1053 if (ret) {
1054 free_extent_buffer_stale(buf);
1055 return ret;
1056 }
1057
1058 if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) {
1059 free_extent_buffer_stale(buf);
1060 return -EIO;
1061 } else if (extent_buffer_uptodate(buf)) {
1062 *eb = buf;
1063 } else {
1064 free_extent_buffer(buf);
1065 }
1066 return 0;
1067}
1068
1069struct extent_buffer *btrfs_find_create_tree_block(
1070 struct btrfs_fs_info *fs_info,
1071 u64 bytenr)
1072{
1073 if (btrfs_is_testing(fs_info))
1074 return alloc_test_extent_buffer(fs_info, bytenr);
1075 return alloc_extent_buffer(fs_info, bytenr);
1076}
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
1087 u64 parent_transid, int level,
1088 struct btrfs_key *first_key)
1089{
1090 struct extent_buffer *buf = NULL;
1091 int ret;
1092
1093 buf = btrfs_find_create_tree_block(fs_info, bytenr);
1094 if (IS_ERR(buf))
1095 return buf;
1096
1097 ret = btree_read_extent_buffer_pages(buf, parent_transid,
1098 level, first_key);
1099 if (ret) {
1100 free_extent_buffer_stale(buf);
1101 return ERR_PTR(ret);
1102 }
1103 return buf;
1104
1105}
1106
1107void btrfs_clean_tree_block(struct extent_buffer *buf)
1108{
1109 struct btrfs_fs_info *fs_info = buf->fs_info;
1110 if (btrfs_header_generation(buf) ==
1111 fs_info->running_transaction->transid) {
1112 btrfs_assert_tree_locked(buf);
1113
1114 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
1115 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
1116 -buf->len,
1117 fs_info->dirty_metadata_batch);
1118
1119 btrfs_set_lock_blocking_write(buf);
1120 clear_extent_buffer_dirty(buf);
1121 }
1122 }
1123}
1124
1125static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void)
1126{
1127 struct btrfs_subvolume_writers *writers;
1128 int ret;
1129
1130 writers = kmalloc(sizeof(*writers), GFP_NOFS);
1131 if (!writers)
1132 return ERR_PTR(-ENOMEM);
1133
1134 ret = percpu_counter_init(&writers->counter, 0, GFP_NOFS);
1135 if (ret < 0) {
1136 kfree(writers);
1137 return ERR_PTR(ret);
1138 }
1139
1140 init_waitqueue_head(&writers->wait);
1141 return writers;
1142}
1143
1144static void
1145btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers)
1146{
1147 percpu_counter_destroy(&writers->counter);
1148 kfree(writers);
1149}
1150
1151static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
1152 u64 objectid)
1153{
1154 bool dummy = test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
1155 root->node = NULL;
1156 root->commit_root = NULL;
1157 root->state = 0;
1158 root->orphan_cleanup_state = 0;
1159
1160 root->last_trans = 0;
1161 root->highest_objectid = 0;
1162 root->nr_delalloc_inodes = 0;
1163 root->nr_ordered_extents = 0;
1164 root->inode_tree = RB_ROOT;
1165 INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
1166 root->block_rsv = NULL;
1167
1168 INIT_LIST_HEAD(&root->dirty_list);
1169 INIT_LIST_HEAD(&root->root_list);
1170 INIT_LIST_HEAD(&root->delalloc_inodes);
1171 INIT_LIST_HEAD(&root->delalloc_root);
1172 INIT_LIST_HEAD(&root->ordered_extents);
1173 INIT_LIST_HEAD(&root->ordered_root);
1174 INIT_LIST_HEAD(&root->reloc_dirty_list);
1175 INIT_LIST_HEAD(&root->logged_list[0]);
1176 INIT_LIST_HEAD(&root->logged_list[1]);
1177 spin_lock_init(&root->inode_lock);
1178 spin_lock_init(&root->delalloc_lock);
1179 spin_lock_init(&root->ordered_extent_lock);
1180 spin_lock_init(&root->accounting_lock);
1181 spin_lock_init(&root->log_extents_lock[0]);
1182 spin_lock_init(&root->log_extents_lock[1]);
1183 spin_lock_init(&root->qgroup_meta_rsv_lock);
1184 mutex_init(&root->objectid_mutex);
1185 mutex_init(&root->log_mutex);
1186 mutex_init(&root->ordered_extent_mutex);
1187 mutex_init(&root->delalloc_mutex);
1188 init_waitqueue_head(&root->log_writer_wait);
1189 init_waitqueue_head(&root->log_commit_wait[0]);
1190 init_waitqueue_head(&root->log_commit_wait[1]);
1191 INIT_LIST_HEAD(&root->log_ctxs[0]);
1192 INIT_LIST_HEAD(&root->log_ctxs[1]);
1193 atomic_set(&root->log_commit[0], 0);
1194 atomic_set(&root->log_commit[1], 0);
1195 atomic_set(&root->log_writers, 0);
1196 atomic_set(&root->log_batch, 0);
1197 refcount_set(&root->refs, 1);
1198 atomic_set(&root->will_be_snapshotted, 0);
1199 atomic_set(&root->snapshot_force_cow, 0);
1200 atomic_set(&root->nr_swapfiles, 0);
1201 root->log_transid = 0;
1202 root->log_transid_committed = -1;
1203 root->last_log_commit = 0;
1204 if (!dummy)
1205 extent_io_tree_init(fs_info, &root->dirty_log_pages,
1206 IO_TREE_ROOT_DIRTY_LOG_PAGES, NULL);
1207
1208 memset(&root->root_key, 0, sizeof(root->root_key));
1209 memset(&root->root_item, 0, sizeof(root->root_item));
1210 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
1211 if (!dummy)
1212 root->defrag_trans_start = fs_info->generation;
1213 else
1214 root->defrag_trans_start = 0;
1215 root->root_key.objectid = objectid;
1216 root->anon_dev = 0;
1217
1218 spin_lock_init(&root->root_item_lock);
1219 btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks);
1220}
1221
1222static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
1223 gfp_t flags)
1224{
1225 struct btrfs_root *root = kzalloc(sizeof(*root), flags);
1226 if (root)
1227 root->fs_info = fs_info;
1228 return root;
1229}
1230
1231#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1232
1233struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info)
1234{
1235 struct btrfs_root *root;
1236
1237 if (!fs_info)
1238 return ERR_PTR(-EINVAL);
1239
1240 root = btrfs_alloc_root(fs_info, GFP_KERNEL);
1241 if (!root)
1242 return ERR_PTR(-ENOMEM);
1243
1244
1245 __setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
1246 root->alloc_bytenr = 0;
1247
1248 return root;
1249}
1250#endif
1251
1252struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
1253 u64 objectid)
1254{
1255 struct btrfs_fs_info *fs_info = trans->fs_info;
1256 struct extent_buffer *leaf;
1257 struct btrfs_root *tree_root = fs_info->tree_root;
1258 struct btrfs_root *root;
1259 struct btrfs_key key;
1260 unsigned int nofs_flag;
1261 int ret = 0;
1262 uuid_le uuid = NULL_UUID_LE;
1263
1264
1265
1266
1267
1268 nofs_flag = memalloc_nofs_save();
1269 root = btrfs_alloc_root(fs_info, GFP_KERNEL);
1270 memalloc_nofs_restore(nofs_flag);
1271 if (!root)
1272 return ERR_PTR(-ENOMEM);
1273
1274 __setup_root(root, fs_info, objectid);
1275 root->root_key.objectid = objectid;
1276 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1277 root->root_key.offset = 0;
1278
1279 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
1280 if (IS_ERR(leaf)) {
1281 ret = PTR_ERR(leaf);
1282 leaf = NULL;
1283 goto fail;
1284 }
1285
1286 root->node = leaf;
1287 btrfs_mark_buffer_dirty(leaf);
1288
1289 root->commit_root = btrfs_root_node(root);
1290 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
1291
1292 root->root_item.flags = 0;
1293 root->root_item.byte_limit = 0;
1294 btrfs_set_root_bytenr(&root->root_item, leaf->start);
1295 btrfs_set_root_generation(&root->root_item, trans->transid);
1296 btrfs_set_root_level(&root->root_item, 0);
1297 btrfs_set_root_refs(&root->root_item, 1);
1298 btrfs_set_root_used(&root->root_item, leaf->len);
1299 btrfs_set_root_last_snapshot(&root->root_item, 0);
1300 btrfs_set_root_dirid(&root->root_item, 0);
1301 if (is_fstree(objectid))
1302 uuid_le_gen(&uuid);
1303 memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
1304 root->root_item.drop_level = 0;
1305
1306 key.objectid = objectid;
1307 key.type = BTRFS_ROOT_ITEM_KEY;
1308 key.offset = 0;
1309 ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
1310 if (ret)
1311 goto fail;
1312
1313 btrfs_tree_unlock(leaf);
1314
1315 return root;
1316
1317fail:
1318 if (leaf) {
1319 btrfs_tree_unlock(leaf);
1320 free_extent_buffer(root->commit_root);
1321 free_extent_buffer(leaf);
1322 }
1323 kfree(root);
1324
1325 return ERR_PTR(ret);
1326}
1327
1328static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1329 struct btrfs_fs_info *fs_info)
1330{
1331 struct btrfs_root *root;
1332 struct extent_buffer *leaf;
1333
1334 root = btrfs_alloc_root(fs_info, GFP_NOFS);
1335 if (!root)
1336 return ERR_PTR(-ENOMEM);
1337
1338 __setup_root(root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1339
1340 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1341 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1342 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353 leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
1354 NULL, 0, 0, 0);
1355 if (IS_ERR(leaf)) {
1356 kfree(root);
1357 return ERR_CAST(leaf);
1358 }
1359
1360 root->node = leaf;
1361
1362 btrfs_mark_buffer_dirty(root->node);
1363 btrfs_tree_unlock(root->node);
1364 return root;
1365}
1366
1367int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1368 struct btrfs_fs_info *fs_info)
1369{
1370 struct btrfs_root *log_root;
1371
1372 log_root = alloc_log_tree(trans, fs_info);
1373 if (IS_ERR(log_root))
1374 return PTR_ERR(log_root);
1375 WARN_ON(fs_info->log_root_tree);
1376 fs_info->log_root_tree = log_root;
1377 return 0;
1378}
1379
1380int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1381 struct btrfs_root *root)
1382{
1383 struct btrfs_fs_info *fs_info = root->fs_info;
1384 struct btrfs_root *log_root;
1385 struct btrfs_inode_item *inode_item;
1386
1387 log_root = alloc_log_tree(trans, fs_info);
1388 if (IS_ERR(log_root))
1389 return PTR_ERR(log_root);
1390
1391 log_root->last_trans = trans->transid;
1392 log_root->root_key.offset = root->root_key.objectid;
1393
1394 inode_item = &log_root->root_item.inode;
1395 btrfs_set_stack_inode_generation(inode_item, 1);
1396 btrfs_set_stack_inode_size(inode_item, 3);
1397 btrfs_set_stack_inode_nlink(inode_item, 1);
1398 btrfs_set_stack_inode_nbytes(inode_item,
1399 fs_info->nodesize);
1400 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
1401
1402 btrfs_set_root_node(&log_root->root_item, log_root->node);
1403
1404 WARN_ON(root->log_root);
1405 root->log_root = log_root;
1406 root->log_transid = 0;
1407 root->log_transid_committed = -1;
1408 root->last_log_commit = 0;
1409 return 0;
1410}
1411
1412static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
1413 struct btrfs_key *key)
1414{
1415 struct btrfs_root *root;
1416 struct btrfs_fs_info *fs_info = tree_root->fs_info;
1417 struct btrfs_path *path;
1418 u64 generation;
1419 int ret;
1420 int level;
1421
1422 path = btrfs_alloc_path();
1423 if (!path)
1424 return ERR_PTR(-ENOMEM);
1425
1426 root = btrfs_alloc_root(fs_info, GFP_NOFS);
1427 if (!root) {
1428 ret = -ENOMEM;
1429 goto alloc_fail;
1430 }
1431
1432 __setup_root(root, fs_info, key->objectid);
1433
1434 ret = btrfs_find_root(tree_root, key, path,
1435 &root->root_item, &root->root_key);
1436 if (ret) {
1437 if (ret > 0)
1438 ret = -ENOENT;
1439 goto find_fail;
1440 }
1441
1442 generation = btrfs_root_generation(&root->root_item);
1443 level = btrfs_root_level(&root->root_item);
1444 root->node = read_tree_block(fs_info,
1445 btrfs_root_bytenr(&root->root_item),
1446 generation, level, NULL);
1447 if (IS_ERR(root->node)) {
1448 ret = PTR_ERR(root->node);
1449 goto find_fail;
1450 } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
1451 ret = -EIO;
1452 free_extent_buffer(root->node);
1453 goto find_fail;
1454 }
1455 root->commit_root = btrfs_root_node(root);
1456out:
1457 btrfs_free_path(path);
1458 return root;
1459
1460find_fail:
1461 kfree(root);
1462alloc_fail:
1463 root = ERR_PTR(ret);
1464 goto out;
1465}
1466
1467struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
1468 struct btrfs_key *location)
1469{
1470 struct btrfs_root *root;
1471
1472 root = btrfs_read_tree_root(tree_root, location);
1473 if (IS_ERR(root))
1474 return root;
1475
1476 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
1477 set_bit(BTRFS_ROOT_REF_COWS, &root->state);
1478 btrfs_check_and_init_root_item(&root->root_item);
1479 }
1480
1481 return root;
1482}
1483
1484int btrfs_init_fs_root(struct btrfs_root *root)
1485{
1486 int ret;
1487 struct btrfs_subvolume_writers *writers;
1488
1489 root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
1490 root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
1491 GFP_NOFS);
1492 if (!root->free_ino_pinned || !root->free_ino_ctl) {
1493 ret = -ENOMEM;
1494 goto fail;
1495 }
1496
1497 writers = btrfs_alloc_subvolume_writers();
1498 if (IS_ERR(writers)) {
1499 ret = PTR_ERR(writers);
1500 goto fail;
1501 }
1502 root->subv_writers = writers;
1503
1504 btrfs_init_free_ino_ctl(root);
1505 spin_lock_init(&root->ino_cache_lock);
1506 init_waitqueue_head(&root->ino_cache_wait);
1507
1508 ret = get_anon_bdev(&root->anon_dev);
1509 if (ret)
1510 goto fail;
1511
1512 mutex_lock(&root->objectid_mutex);
1513 ret = btrfs_find_highest_objectid(root,
1514 &root->highest_objectid);
1515 if (ret) {
1516 mutex_unlock(&root->objectid_mutex);
1517 goto fail;
1518 }
1519
1520 ASSERT(root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
1521
1522 mutex_unlock(&root->objectid_mutex);
1523
1524 return 0;
1525fail:
1526
1527 return ret;
1528}
1529
1530struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1531 u64 root_id)
1532{
1533 struct btrfs_root *root;
1534
1535 spin_lock(&fs_info->fs_roots_radix_lock);
1536 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1537 (unsigned long)root_id);
1538 spin_unlock(&fs_info->fs_roots_radix_lock);
1539 return root;
1540}
1541
1542int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
1543 struct btrfs_root *root)
1544{
1545 int ret;
1546
1547 ret = radix_tree_preload(GFP_NOFS);
1548 if (ret)
1549 return ret;
1550
1551 spin_lock(&fs_info->fs_roots_radix_lock);
1552 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1553 (unsigned long)root->root_key.objectid,
1554 root);
1555 if (ret == 0)
1556 set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
1557 spin_unlock(&fs_info->fs_roots_radix_lock);
1558 radix_tree_preload_end();
1559
1560 return ret;
1561}
1562
1563struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
1564 struct btrfs_key *location,
1565 bool check_ref)
1566{
1567 struct btrfs_root *root;
1568 struct btrfs_path *path;
1569 struct btrfs_key key;
1570 int ret;
1571
1572 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1573 return fs_info->tree_root;
1574 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
1575 return fs_info->extent_root;
1576 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
1577 return fs_info->chunk_root;
1578 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
1579 return fs_info->dev_root;
1580 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
1581 return fs_info->csum_root;
1582 if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
1583 return fs_info->quota_root ? fs_info->quota_root :
1584 ERR_PTR(-ENOENT);
1585 if (location->objectid == BTRFS_UUID_TREE_OBJECTID)
1586 return fs_info->uuid_root ? fs_info->uuid_root :
1587 ERR_PTR(-ENOENT);
1588 if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
1589 return fs_info->free_space_root ? fs_info->free_space_root :
1590 ERR_PTR(-ENOENT);
1591again:
1592 root = btrfs_lookup_fs_root(fs_info, location->objectid);
1593 if (root) {
1594 if (check_ref && btrfs_root_refs(&root->root_item) == 0)
1595 return ERR_PTR(-ENOENT);
1596 return root;
1597 }
1598
1599 root = btrfs_read_fs_root(fs_info->tree_root, location);
1600 if (IS_ERR(root))
1601 return root;
1602
1603 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1604 ret = -ENOENT;
1605 goto fail;
1606 }
1607
1608 ret = btrfs_init_fs_root(root);
1609 if (ret)
1610 goto fail;
1611
1612 path = btrfs_alloc_path();
1613 if (!path) {
1614 ret = -ENOMEM;
1615 goto fail;
1616 }
1617 key.objectid = BTRFS_ORPHAN_OBJECTID;
1618 key.type = BTRFS_ORPHAN_ITEM_KEY;
1619 key.offset = location->objectid;
1620
1621 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
1622 btrfs_free_path(path);
1623 if (ret < 0)
1624 goto fail;
1625 if (ret == 0)
1626 set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
1627
1628 ret = btrfs_insert_fs_root(fs_info, root);
1629 if (ret) {
1630 if (ret == -EEXIST) {
1631 btrfs_free_fs_root(root);
1632 goto again;
1633 }
1634 goto fail;
1635 }
1636 return root;
1637fail:
1638 btrfs_free_fs_root(root);
1639 return ERR_PTR(ret);
1640}
1641
1642static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1643{
1644 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
1645 int ret = 0;
1646 struct btrfs_device *device;
1647 struct backing_dev_info *bdi;
1648
1649 rcu_read_lock();
1650 list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
1651 if (!device->bdev)
1652 continue;
1653 bdi = device->bdev->bd_bdi;
1654 if (bdi_congested(bdi, bdi_bits)) {
1655 ret = 1;
1656 break;
1657 }
1658 }
1659 rcu_read_unlock();
1660 return ret;
1661}
1662
1663
1664
1665
1666
1667static void end_workqueue_fn(struct btrfs_work *work)
1668{
1669 struct bio *bio;
1670 struct btrfs_end_io_wq *end_io_wq;
1671
1672 end_io_wq = container_of(work, struct btrfs_end_io_wq, work);
1673 bio = end_io_wq->bio;
1674
1675 bio->bi_status = end_io_wq->status;
1676 bio->bi_private = end_io_wq->private;
1677 bio->bi_end_io = end_io_wq->end_io;
1678 kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq);
1679 bio_endio(bio);
1680}
1681
1682static int cleaner_kthread(void *arg)
1683{
1684 struct btrfs_root *root = arg;
1685 struct btrfs_fs_info *fs_info = root->fs_info;
1686 int again;
1687
1688 while (1) {
1689 again = 0;
1690
1691 set_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1692
1693
1694 if (btrfs_need_cleaner_sleep(fs_info))
1695 goto sleep;
1696
1697
1698
1699
1700
1701 if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
1702 goto sleep;
1703
1704 if (!mutex_trylock(&fs_info->cleaner_mutex))
1705 goto sleep;
1706
1707
1708
1709
1710
1711 if (btrfs_need_cleaner_sleep(fs_info)) {
1712 mutex_unlock(&fs_info->cleaner_mutex);
1713 goto sleep;
1714 }
1715
1716 btrfs_run_delayed_iputs(fs_info);
1717
1718 again = btrfs_clean_one_deleted_snapshot(root);
1719 mutex_unlock(&fs_info->cleaner_mutex);
1720
1721
1722
1723
1724
1725 btrfs_run_defrag_inodes(fs_info);
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735 btrfs_delete_unused_bgs(fs_info);
1736sleep:
1737 clear_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1738 if (kthread_should_park())
1739 kthread_parkme();
1740 if (kthread_should_stop())
1741 return 0;
1742 if (!again) {
1743 set_current_state(TASK_INTERRUPTIBLE);
1744 schedule();
1745 __set_current_state(TASK_RUNNING);
1746 }
1747 }
1748}
1749
1750static int transaction_kthread(void *arg)
1751{
1752 struct btrfs_root *root = arg;
1753 struct btrfs_fs_info *fs_info = root->fs_info;
1754 struct btrfs_trans_handle *trans;
1755 struct btrfs_transaction *cur;
1756 u64 transid;
1757 time64_t now;
1758 unsigned long delay;
1759 bool cannot_commit;
1760
1761 do {
1762 cannot_commit = false;
1763 delay = HZ * fs_info->commit_interval;
1764 mutex_lock(&fs_info->transaction_kthread_mutex);
1765
1766 spin_lock(&fs_info->trans_lock);
1767 cur = fs_info->running_transaction;
1768 if (!cur) {
1769 spin_unlock(&fs_info->trans_lock);
1770 goto sleep;
1771 }
1772
1773 now = ktime_get_seconds();
1774 if (cur->state < TRANS_STATE_BLOCKED &&
1775 !test_bit(BTRFS_FS_NEED_ASYNC_COMMIT, &fs_info->flags) &&
1776 (now < cur->start_time ||
1777 now - cur->start_time < fs_info->commit_interval)) {
1778 spin_unlock(&fs_info->trans_lock);
1779 delay = HZ * 5;
1780 goto sleep;
1781 }
1782 transid = cur->transid;
1783 spin_unlock(&fs_info->trans_lock);
1784
1785
1786 trans = btrfs_attach_transaction(root);
1787 if (IS_ERR(trans)) {
1788 if (PTR_ERR(trans) != -ENOENT)
1789 cannot_commit = true;
1790 goto sleep;
1791 }
1792 if (transid == trans->transid) {
1793 btrfs_commit_transaction(trans);
1794 } else {
1795 btrfs_end_transaction(trans);
1796 }
1797sleep:
1798 wake_up_process(fs_info->cleaner_kthread);
1799 mutex_unlock(&fs_info->transaction_kthread_mutex);
1800
1801 if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
1802 &fs_info->fs_state)))
1803 btrfs_cleanup_transaction(fs_info);
1804 if (!kthread_should_stop() &&
1805 (!btrfs_transaction_blocked(fs_info) ||
1806 cannot_commit))
1807 schedule_timeout_interruptible(delay);
1808 } while (!kthread_should_stop());
1809 return 0;
1810}
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen)
1822{
1823 u64 cur;
1824 int newest_index = -1;
1825 struct btrfs_root_backup *root_backup;
1826 int i;
1827
1828 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
1829 root_backup = info->super_copy->super_roots + i;
1830 cur = btrfs_backup_tree_root_gen(root_backup);
1831 if (cur == newest_gen)
1832 newest_index = i;
1833 }
1834
1835
1836 if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) {
1837 root_backup = info->super_copy->super_roots;
1838 cur = btrfs_backup_tree_root_gen(root_backup);
1839 if (cur == newest_gen)
1840 newest_index = 0;
1841 }
1842 return newest_index;
1843}
1844
1845
1846
1847
1848
1849
1850
1851static void find_oldest_super_backup(struct btrfs_fs_info *info,
1852 u64 newest_gen)
1853{
1854 int newest_index = -1;
1855
1856 newest_index = find_newest_super_backup(info, newest_gen);
1857
1858 if (newest_index == -1) {
1859 info->backup_root_index = 0;
1860 } else {
1861 info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS;
1862 }
1863}
1864
1865
1866
1867
1868
1869
1870static void backup_super_roots(struct btrfs_fs_info *info)
1871{
1872 int next_backup;
1873 struct btrfs_root_backup *root_backup;
1874 int last_backup;
1875
1876 next_backup = info->backup_root_index;
1877 last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) %
1878 BTRFS_NUM_BACKUP_ROOTS;
1879
1880
1881
1882
1883
1884 root_backup = info->super_for_commit->super_roots + last_backup;
1885 if (btrfs_backup_tree_root_gen(root_backup) ==
1886 btrfs_header_generation(info->tree_root->node))
1887 next_backup = last_backup;
1888
1889 root_backup = info->super_for_commit->super_roots + next_backup;
1890
1891
1892
1893
1894
1895 memset(root_backup, 0, sizeof(*root_backup));
1896
1897 info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
1898
1899 btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
1900 btrfs_set_backup_tree_root_gen(root_backup,
1901 btrfs_header_generation(info->tree_root->node));
1902
1903 btrfs_set_backup_tree_root_level(root_backup,
1904 btrfs_header_level(info->tree_root->node));
1905
1906 btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
1907 btrfs_set_backup_chunk_root_gen(root_backup,
1908 btrfs_header_generation(info->chunk_root->node));
1909 btrfs_set_backup_chunk_root_level(root_backup,
1910 btrfs_header_level(info->chunk_root->node));
1911
1912 btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start);
1913 btrfs_set_backup_extent_root_gen(root_backup,
1914 btrfs_header_generation(info->extent_root->node));
1915 btrfs_set_backup_extent_root_level(root_backup,
1916 btrfs_header_level(info->extent_root->node));
1917
1918
1919
1920
1921
1922 if (info->fs_root && info->fs_root->node) {
1923 btrfs_set_backup_fs_root(root_backup,
1924 info->fs_root->node->start);
1925 btrfs_set_backup_fs_root_gen(root_backup,
1926 btrfs_header_generation(info->fs_root->node));
1927 btrfs_set_backup_fs_root_level(root_backup,
1928 btrfs_header_level(info->fs_root->node));
1929 }
1930
1931 btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
1932 btrfs_set_backup_dev_root_gen(root_backup,
1933 btrfs_header_generation(info->dev_root->node));
1934 btrfs_set_backup_dev_root_level(root_backup,
1935 btrfs_header_level(info->dev_root->node));
1936
1937 btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start);
1938 btrfs_set_backup_csum_root_gen(root_backup,
1939 btrfs_header_generation(info->csum_root->node));
1940 btrfs_set_backup_csum_root_level(root_backup,
1941 btrfs_header_level(info->csum_root->node));
1942
1943 btrfs_set_backup_total_bytes(root_backup,
1944 btrfs_super_total_bytes(info->super_copy));
1945 btrfs_set_backup_bytes_used(root_backup,
1946 btrfs_super_bytes_used(info->super_copy));
1947 btrfs_set_backup_num_devices(root_backup,
1948 btrfs_super_num_devices(info->super_copy));
1949
1950
1951
1952
1953
1954 memcpy(&info->super_copy->super_roots,
1955 &info->super_for_commit->super_roots,
1956 sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
1957}
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967static noinline int next_root_backup(struct btrfs_fs_info *info,
1968 struct btrfs_super_block *super,
1969 int *num_backups_tried, int *backup_index)
1970{
1971 struct btrfs_root_backup *root_backup;
1972 int newest = *backup_index;
1973
1974 if (*num_backups_tried == 0) {
1975 u64 gen = btrfs_super_generation(super);
1976
1977 newest = find_newest_super_backup(info, gen);
1978 if (newest == -1)
1979 return -1;
1980
1981 *backup_index = newest;
1982 *num_backups_tried = 1;
1983 } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) {
1984
1985 return -1;
1986 } else {
1987
1988 newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) %
1989 BTRFS_NUM_BACKUP_ROOTS;
1990 *backup_index = newest;
1991 *num_backups_tried += 1;
1992 }
1993 root_backup = super->super_roots + newest;
1994
1995 btrfs_set_super_generation(super,
1996 btrfs_backup_tree_root_gen(root_backup));
1997 btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
1998 btrfs_set_super_root_level(super,
1999 btrfs_backup_tree_root_level(root_backup));
2000 btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
2001
2002
2003
2004
2005
2006 btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
2007 btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
2008 return 0;
2009}
2010
2011
2012static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
2013{
2014 btrfs_destroy_workqueue(fs_info->fixup_workers);
2015 btrfs_destroy_workqueue(fs_info->delalloc_workers);
2016 btrfs_destroy_workqueue(fs_info->workers);
2017 btrfs_destroy_workqueue(fs_info->endio_workers);
2018 btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
2019 btrfs_destroy_workqueue(fs_info->endio_repair_workers);
2020 btrfs_destroy_workqueue(fs_info->rmw_workers);
2021 btrfs_destroy_workqueue(fs_info->endio_write_workers);
2022 btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
2023 btrfs_destroy_workqueue(fs_info->submit_workers);
2024 btrfs_destroy_workqueue(fs_info->delayed_workers);
2025 btrfs_destroy_workqueue(fs_info->caching_workers);
2026 btrfs_destroy_workqueue(fs_info->readahead_workers);
2027 btrfs_destroy_workqueue(fs_info->flush_workers);
2028 btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
2029 btrfs_destroy_workqueue(fs_info->extent_workers);
2030
2031
2032
2033
2034
2035 btrfs_destroy_workqueue(fs_info->endio_meta_workers);
2036 btrfs_destroy_workqueue(fs_info->endio_meta_write_workers);
2037}
2038
2039static void free_root_extent_buffers(struct btrfs_root *root)
2040{
2041 if (root) {
2042 free_extent_buffer(root->node);
2043 free_extent_buffer(root->commit_root);
2044 root->node = NULL;
2045 root->commit_root = NULL;
2046 }
2047}
2048
2049
2050static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
2051{
2052 free_root_extent_buffers(info->tree_root);
2053
2054 free_root_extent_buffers(info->dev_root);
2055 free_root_extent_buffers(info->extent_root);
2056 free_root_extent_buffers(info->csum_root);
2057 free_root_extent_buffers(info->quota_root);
2058 free_root_extent_buffers(info->uuid_root);
2059 if (chunk_root)
2060 free_root_extent_buffers(info->chunk_root);
2061 free_root_extent_buffers(info->free_space_root);
2062}
2063
2064void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
2065{
2066 int ret;
2067 struct btrfs_root *gang[8];
2068 int i;
2069
2070 while (!list_empty(&fs_info->dead_roots)) {
2071 gang[0] = list_entry(fs_info->dead_roots.next,
2072 struct btrfs_root, root_list);
2073 list_del(&gang[0]->root_list);
2074
2075 if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) {
2076 btrfs_drop_and_free_fs_root(fs_info, gang[0]);
2077 } else {
2078 free_extent_buffer(gang[0]->node);
2079 free_extent_buffer(gang[0]->commit_root);
2080 btrfs_put_fs_root(gang[0]);
2081 }
2082 }
2083
2084 while (1) {
2085 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2086 (void **)gang, 0,
2087 ARRAY_SIZE(gang));
2088 if (!ret)
2089 break;
2090 for (i = 0; i < ret; i++)
2091 btrfs_drop_and_free_fs_root(fs_info, gang[i]);
2092 }
2093
2094 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
2095 btrfs_free_log_root_tree(NULL, fs_info);
2096 btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
2097 }
2098}
2099
2100static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
2101{
2102 mutex_init(&fs_info->scrub_lock);
2103 atomic_set(&fs_info->scrubs_running, 0);
2104 atomic_set(&fs_info->scrub_pause_req, 0);
2105 atomic_set(&fs_info->scrubs_paused, 0);
2106 atomic_set(&fs_info->scrub_cancel_req, 0);
2107 init_waitqueue_head(&fs_info->scrub_pause_wait);
2108 refcount_set(&fs_info->scrub_workers_refcnt, 0);
2109}
2110
2111static void btrfs_init_balance(struct btrfs_fs_info *fs_info)
2112{
2113 spin_lock_init(&fs_info->balance_lock);
2114 mutex_init(&fs_info->balance_mutex);
2115 atomic_set(&fs_info->balance_pause_req, 0);
2116 atomic_set(&fs_info->balance_cancel_req, 0);
2117 fs_info->balance_ctl = NULL;
2118 init_waitqueue_head(&fs_info->balance_wait_q);
2119}
2120
2121static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
2122{
2123 struct inode *inode = fs_info->btree_inode;
2124
2125 inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
2126 set_nlink(inode, 1);
2127
2128
2129
2130
2131
2132 inode->i_size = OFFSET_MAX;
2133 inode->i_mapping->a_ops = &btree_aops;
2134
2135 RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
2136 extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
2137 IO_TREE_INODE_IO, inode);
2138 BTRFS_I(inode)->io_tree.track_uptodate = false;
2139 extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
2140
2141 BTRFS_I(inode)->io_tree.ops = &btree_extent_io_ops;
2142
2143 BTRFS_I(inode)->root = fs_info->tree_root;
2144 memset(&BTRFS_I(inode)->location, 0, sizeof(struct btrfs_key));
2145 set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
2146 btrfs_insert_inode_hash(inode);
2147}
2148
2149static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
2150{
2151 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2152 init_rwsem(&fs_info->dev_replace.rwsem);
2153 init_waitqueue_head(&fs_info->dev_replace.replace_wait);
2154}
2155
2156static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)
2157{
2158 spin_lock_init(&fs_info->qgroup_lock);
2159 mutex_init(&fs_info->qgroup_ioctl_lock);
2160 fs_info->qgroup_tree = RB_ROOT;
2161 INIT_LIST_HEAD(&fs_info->dirty_qgroups);
2162 fs_info->qgroup_seq = 1;
2163 fs_info->qgroup_ulist = NULL;
2164 fs_info->qgroup_rescan_running = false;
2165 mutex_init(&fs_info->qgroup_rescan_lock);
2166}
2167
2168static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info,
2169 struct btrfs_fs_devices *fs_devices)
2170{
2171 u32 max_active = fs_info->thread_pool_size;
2172 unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
2173
2174 fs_info->workers =
2175 btrfs_alloc_workqueue(fs_info, "worker",
2176 flags | WQ_HIGHPRI, max_active, 16);
2177
2178 fs_info->delalloc_workers =
2179 btrfs_alloc_workqueue(fs_info, "delalloc",
2180 flags, max_active, 2);
2181
2182 fs_info->flush_workers =
2183 btrfs_alloc_workqueue(fs_info, "flush_delalloc",
2184 flags, max_active, 0);
2185
2186 fs_info->caching_workers =
2187 btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0);
2188
2189
2190
2191
2192
2193
2194 fs_info->submit_workers =
2195 btrfs_alloc_workqueue(fs_info, "submit", flags,
2196 min_t(u64, fs_devices->num_devices,
2197 max_active), 64);
2198
2199 fs_info->fixup_workers =
2200 btrfs_alloc_workqueue(fs_info, "fixup", flags, 1, 0);
2201
2202
2203
2204
2205
2206 fs_info->endio_workers =
2207 btrfs_alloc_workqueue(fs_info, "endio", flags, max_active, 4);
2208 fs_info->endio_meta_workers =
2209 btrfs_alloc_workqueue(fs_info, "endio-meta", flags,
2210 max_active, 4);
2211 fs_info->endio_meta_write_workers =
2212 btrfs_alloc_workqueue(fs_info, "endio-meta-write", flags,
2213 max_active, 2);
2214 fs_info->endio_raid56_workers =
2215 btrfs_alloc_workqueue(fs_info, "endio-raid56", flags,
2216 max_active, 4);
2217 fs_info->endio_repair_workers =
2218 btrfs_alloc_workqueue(fs_info, "endio-repair", flags, 1, 0);
2219 fs_info->rmw_workers =
2220 btrfs_alloc_workqueue(fs_info, "rmw", flags, max_active, 2);
2221 fs_info->endio_write_workers =
2222 btrfs_alloc_workqueue(fs_info, "endio-write", flags,
2223 max_active, 2);
2224 fs_info->endio_freespace_worker =
2225 btrfs_alloc_workqueue(fs_info, "freespace-write", flags,
2226 max_active, 0);
2227 fs_info->delayed_workers =
2228 btrfs_alloc_workqueue(fs_info, "delayed-meta", flags,
2229 max_active, 0);
2230 fs_info->readahead_workers =
2231 btrfs_alloc_workqueue(fs_info, "readahead", flags,
2232 max_active, 2);
2233 fs_info->qgroup_rescan_workers =
2234 btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0);
2235 fs_info->extent_workers =
2236 btrfs_alloc_workqueue(fs_info, "extent-refs", flags,
2237 min_t(u64, fs_devices->num_devices,
2238 max_active), 8);
2239
2240 if (!(fs_info->workers && fs_info->delalloc_workers &&
2241 fs_info->submit_workers && fs_info->flush_workers &&
2242 fs_info->endio_workers && fs_info->endio_meta_workers &&
2243 fs_info->endio_meta_write_workers &&
2244 fs_info->endio_repair_workers &&
2245 fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
2246 fs_info->endio_freespace_worker && fs_info->rmw_workers &&
2247 fs_info->caching_workers && fs_info->readahead_workers &&
2248 fs_info->fixup_workers && fs_info->delayed_workers &&
2249 fs_info->extent_workers &&
2250 fs_info->qgroup_rescan_workers)) {
2251 return -ENOMEM;
2252 }
2253
2254 return 0;
2255}
2256
2257static int btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type)
2258{
2259 struct crypto_shash *csum_shash;
2260 const char *csum_name = btrfs_super_csum_name(csum_type);
2261
2262 csum_shash = crypto_alloc_shash(csum_name, 0, 0);
2263
2264 if (IS_ERR(csum_shash)) {
2265 btrfs_err(fs_info, "error allocating %s hash for checksum",
2266 csum_name);
2267 return PTR_ERR(csum_shash);
2268 }
2269
2270 fs_info->csum_shash = csum_shash;
2271
2272 return 0;
2273}
2274
2275static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
2276{
2277 crypto_free_shash(fs_info->csum_shash);
2278}
2279
2280static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
2281 struct btrfs_fs_devices *fs_devices)
2282{
2283 int ret;
2284 struct btrfs_root *log_tree_root;
2285 struct btrfs_super_block *disk_super = fs_info->super_copy;
2286 u64 bytenr = btrfs_super_log_root(disk_super);
2287 int level = btrfs_super_log_root_level(disk_super);
2288
2289 if (fs_devices->rw_devices == 0) {
2290 btrfs_warn(fs_info, "log replay required on RO media");
2291 return -EIO;
2292 }
2293
2294 log_tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
2295 if (!log_tree_root)
2296 return -ENOMEM;
2297
2298 __setup_root(log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
2299
2300 log_tree_root->node = read_tree_block(fs_info, bytenr,
2301 fs_info->generation + 1,
2302 level, NULL);
2303 if (IS_ERR(log_tree_root->node)) {
2304 btrfs_warn(fs_info, "failed to read log tree");
2305 ret = PTR_ERR(log_tree_root->node);
2306 kfree(log_tree_root);
2307 return ret;
2308 } else if (!extent_buffer_uptodate(log_tree_root->node)) {
2309 btrfs_err(fs_info, "failed to read log tree");
2310 free_extent_buffer(log_tree_root->node);
2311 kfree(log_tree_root);
2312 return -EIO;
2313 }
2314
2315 ret = btrfs_recover_log_trees(log_tree_root);
2316 if (ret) {
2317 btrfs_handle_fs_error(fs_info, ret,
2318 "Failed to recover log tree");
2319 free_extent_buffer(log_tree_root->node);
2320 kfree(log_tree_root);
2321 return ret;
2322 }
2323
2324 if (sb_rdonly(fs_info->sb)) {
2325 ret = btrfs_commit_super(fs_info);
2326 if (ret)
2327 return ret;
2328 }
2329
2330 return 0;
2331}
2332
2333static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
2334{
2335 struct btrfs_root *tree_root = fs_info->tree_root;
2336 struct btrfs_root *root;
2337 struct btrfs_key location;
2338 int ret;
2339
2340 BUG_ON(!fs_info->tree_root);
2341
2342 location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
2343 location.type = BTRFS_ROOT_ITEM_KEY;
2344 location.offset = 0;
2345
2346 root = btrfs_read_tree_root(tree_root, &location);
2347 if (IS_ERR(root)) {
2348 ret = PTR_ERR(root);
2349 goto out;
2350 }
2351 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2352 fs_info->extent_root = root;
2353
2354 location.objectid = BTRFS_DEV_TREE_OBJECTID;
2355 root = btrfs_read_tree_root(tree_root, &location);
2356 if (IS_ERR(root)) {
2357 ret = PTR_ERR(root);
2358 goto out;
2359 }
2360 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2361 fs_info->dev_root = root;
2362 btrfs_init_devices_late(fs_info);
2363
2364 location.objectid = BTRFS_CSUM_TREE_OBJECTID;
2365 root = btrfs_read_tree_root(tree_root, &location);
2366 if (IS_ERR(root)) {
2367 ret = PTR_ERR(root);
2368 goto out;
2369 }
2370 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2371 fs_info->csum_root = root;
2372
2373 location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
2374 root = btrfs_read_tree_root(tree_root, &location);
2375 if (!IS_ERR(root)) {
2376 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2377 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
2378 fs_info->quota_root = root;
2379 }
2380
2381 location.objectid = BTRFS_UUID_TREE_OBJECTID;
2382 root = btrfs_read_tree_root(tree_root, &location);
2383 if (IS_ERR(root)) {
2384 ret = PTR_ERR(root);
2385 if (ret != -ENOENT)
2386 goto out;
2387 } else {
2388 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2389 fs_info->uuid_root = root;
2390 }
2391
2392 if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
2393 location.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID;
2394 root = btrfs_read_tree_root(tree_root, &location);
2395 if (IS_ERR(root)) {
2396 ret = PTR_ERR(root);
2397 goto out;
2398 }
2399 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2400 fs_info->free_space_root = root;
2401 }
2402
2403 return 0;
2404out:
2405 btrfs_warn(fs_info, "failed to read root (objectid=%llu): %d",
2406 location.objectid, ret);
2407 return ret;
2408}
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420static int validate_super(struct btrfs_fs_info *fs_info,
2421 struct btrfs_super_block *sb, int mirror_num)
2422{
2423 u64 nodesize = btrfs_super_nodesize(sb);
2424 u64 sectorsize = btrfs_super_sectorsize(sb);
2425 int ret = 0;
2426
2427 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
2428 btrfs_err(fs_info, "no valid FS found");
2429 ret = -EINVAL;
2430 }
2431 if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP) {
2432 btrfs_err(fs_info, "unrecognized or unsupported super flag: %llu",
2433 btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
2434 ret = -EINVAL;
2435 }
2436 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
2437 btrfs_err(fs_info, "tree_root level too big: %d >= %d",
2438 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
2439 ret = -EINVAL;
2440 }
2441 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
2442 btrfs_err(fs_info, "chunk_root level too big: %d >= %d",
2443 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
2444 ret = -EINVAL;
2445 }
2446 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
2447 btrfs_err(fs_info, "log_root level too big: %d >= %d",
2448 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
2449 ret = -EINVAL;
2450 }
2451
2452
2453
2454
2455
2456 if (!is_power_of_2(sectorsize) || sectorsize < 4096 ||
2457 sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2458 btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
2459 ret = -EINVAL;
2460 }
2461
2462 if (sectorsize != PAGE_SIZE) {
2463 btrfs_err(fs_info,
2464 "sectorsize %llu not supported yet, only support %lu",
2465 sectorsize, PAGE_SIZE);
2466 ret = -EINVAL;
2467 }
2468 if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
2469 nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2470 btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
2471 ret = -EINVAL;
2472 }
2473 if (nodesize != le32_to_cpu(sb->__unused_leafsize)) {
2474 btrfs_err(fs_info, "invalid leafsize %u, should be %llu",
2475 le32_to_cpu(sb->__unused_leafsize), nodesize);
2476 ret = -EINVAL;
2477 }
2478
2479
2480 if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) {
2481 btrfs_warn(fs_info, "tree_root block unaligned: %llu",
2482 btrfs_super_root(sb));
2483 ret = -EINVAL;
2484 }
2485 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) {
2486 btrfs_warn(fs_info, "chunk_root block unaligned: %llu",
2487 btrfs_super_chunk_root(sb));
2488 ret = -EINVAL;
2489 }
2490 if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) {
2491 btrfs_warn(fs_info, "log_root block unaligned: %llu",
2492 btrfs_super_log_root(sb));
2493 ret = -EINVAL;
2494 }
2495
2496 if (memcmp(fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid,
2497 BTRFS_FSID_SIZE) != 0) {
2498 btrfs_err(fs_info,
2499 "dev_item UUID does not match metadata fsid: %pU != %pU",
2500 fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid);
2501 ret = -EINVAL;
2502 }
2503
2504
2505
2506
2507
2508 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
2509 btrfs_err(fs_info, "bytes_used is too small %llu",
2510 btrfs_super_bytes_used(sb));
2511 ret = -EINVAL;
2512 }
2513 if (!is_power_of_2(btrfs_super_stripesize(sb))) {
2514 btrfs_err(fs_info, "invalid stripesize %u",
2515 btrfs_super_stripesize(sb));
2516 ret = -EINVAL;
2517 }
2518 if (btrfs_super_num_devices(sb) > (1UL << 31))
2519 btrfs_warn(fs_info, "suspicious number of devices: %llu",
2520 btrfs_super_num_devices(sb));
2521 if (btrfs_super_num_devices(sb) == 0) {
2522 btrfs_err(fs_info, "number of devices is 0");
2523 ret = -EINVAL;
2524 }
2525
2526 if (mirror_num >= 0 &&
2527 btrfs_super_bytenr(sb) != btrfs_sb_offset(mirror_num)) {
2528 btrfs_err(fs_info, "super offset mismatch %llu != %u",
2529 btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
2530 ret = -EINVAL;
2531 }
2532
2533
2534
2535
2536
2537 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
2538 btrfs_err(fs_info, "system chunk array too big %u > %u",
2539 btrfs_super_sys_array_size(sb),
2540 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
2541 ret = -EINVAL;
2542 }
2543 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
2544 + sizeof(struct btrfs_chunk)) {
2545 btrfs_err(fs_info, "system chunk array too small %u < %zu",
2546 btrfs_super_sys_array_size(sb),
2547 sizeof(struct btrfs_disk_key)
2548 + sizeof(struct btrfs_chunk));
2549 ret = -EINVAL;
2550 }
2551
2552
2553
2554
2555
2556 if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
2557 btrfs_warn(fs_info,
2558 "suspicious: generation < chunk_root_generation: %llu < %llu",
2559 btrfs_super_generation(sb),
2560 btrfs_super_chunk_root_generation(sb));
2561 if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
2562 && btrfs_super_cache_generation(sb) != (u64)-1)
2563 btrfs_warn(fs_info,
2564 "suspicious: generation < cache_generation: %llu < %llu",
2565 btrfs_super_generation(sb),
2566 btrfs_super_cache_generation(sb));
2567
2568 return ret;
2569}
2570
2571
2572
2573
2574
2575
2576static int btrfs_validate_mount_super(struct btrfs_fs_info *fs_info)
2577{
2578 return validate_super(fs_info, fs_info->super_copy, 0);
2579}
2580
2581
2582
2583
2584
2585
2586
2587static int btrfs_validate_write_super(struct btrfs_fs_info *fs_info,
2588 struct btrfs_super_block *sb)
2589{
2590 int ret;
2591
2592 ret = validate_super(fs_info, sb, -1);
2593 if (ret < 0)
2594 goto out;
2595 if (!btrfs_supported_super_csum(btrfs_super_csum_type(sb))) {
2596 ret = -EUCLEAN;
2597 btrfs_err(fs_info, "invalid csum type, has %u want %u",
2598 btrfs_super_csum_type(sb), BTRFS_CSUM_TYPE_CRC32);
2599 goto out;
2600 }
2601 if (btrfs_super_incompat_flags(sb) & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
2602 ret = -EUCLEAN;
2603 btrfs_err(fs_info,
2604 "invalid incompat flags, has 0x%llx valid mask 0x%llx",
2605 btrfs_super_incompat_flags(sb),
2606 (unsigned long long)BTRFS_FEATURE_INCOMPAT_SUPP);
2607 goto out;
2608 }
2609out:
2610 if (ret < 0)
2611 btrfs_err(fs_info,
2612 "super block corruption detected before writing it to disk");
2613 return ret;
2614}
2615
2616int open_ctree(struct super_block *sb,
2617 struct btrfs_fs_devices *fs_devices,
2618 char *options)
2619{
2620 u32 sectorsize;
2621 u32 nodesize;
2622 u32 stripesize;
2623 u64 generation;
2624 u64 features;
2625 u16 csum_type;
2626 struct btrfs_key location;
2627 struct buffer_head *bh;
2628 struct btrfs_super_block *disk_super;
2629 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2630 struct btrfs_root *tree_root;
2631 struct btrfs_root *chunk_root;
2632 int ret;
2633 int err = -EINVAL;
2634 int num_backups_tried = 0;
2635 int backup_index = 0;
2636 int clear_free_space_tree = 0;
2637 int level;
2638
2639 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
2640 chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
2641 if (!tree_root || !chunk_root) {
2642 err = -ENOMEM;
2643 goto fail;
2644 }
2645
2646 ret = init_srcu_struct(&fs_info->subvol_srcu);
2647 if (ret) {
2648 err = ret;
2649 goto fail;
2650 }
2651
2652 ret = percpu_counter_init(&fs_info->dio_bytes, 0, GFP_KERNEL);
2653 if (ret) {
2654 err = ret;
2655 goto fail_srcu;
2656 }
2657
2658 ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
2659 if (ret) {
2660 err = ret;
2661 goto fail_dio_bytes;
2662 }
2663 fs_info->dirty_metadata_batch = PAGE_SIZE *
2664 (1 + ilog2(nr_cpu_ids));
2665
2666 ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
2667 if (ret) {
2668 err = ret;
2669 goto fail_dirty_metadata_bytes;
2670 }
2671
2672 ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
2673 GFP_KERNEL);
2674 if (ret) {
2675 err = ret;
2676 goto fail_delalloc_bytes;
2677 }
2678
2679 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
2680 INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
2681 INIT_LIST_HEAD(&fs_info->trans_list);
2682 INIT_LIST_HEAD(&fs_info->dead_roots);
2683 INIT_LIST_HEAD(&fs_info->delayed_iputs);
2684 INIT_LIST_HEAD(&fs_info->delalloc_roots);
2685 INIT_LIST_HEAD(&fs_info->caching_block_groups);
2686 spin_lock_init(&fs_info->delalloc_root_lock);
2687 spin_lock_init(&fs_info->trans_lock);
2688 spin_lock_init(&fs_info->fs_roots_radix_lock);
2689 spin_lock_init(&fs_info->delayed_iput_lock);
2690 spin_lock_init(&fs_info->defrag_inodes_lock);
2691 spin_lock_init(&fs_info->tree_mod_seq_lock);
2692 spin_lock_init(&fs_info->super_lock);
2693 spin_lock_init(&fs_info->buffer_lock);
2694 spin_lock_init(&fs_info->unused_bgs_lock);
2695 rwlock_init(&fs_info->tree_mod_log_lock);
2696 mutex_init(&fs_info->unused_bg_unpin_mutex);
2697 mutex_init(&fs_info->delete_unused_bgs_mutex);
2698 mutex_init(&fs_info->reloc_mutex);
2699 mutex_init(&fs_info->delalloc_root_mutex);
2700 seqlock_init(&fs_info->profiles_lock);
2701
2702 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
2703 INIT_LIST_HEAD(&fs_info->space_info);
2704 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
2705 INIT_LIST_HEAD(&fs_info->unused_bgs);
2706 extent_map_tree_init(&fs_info->mapping_tree);
2707 btrfs_init_block_rsv(&fs_info->global_block_rsv,
2708 BTRFS_BLOCK_RSV_GLOBAL);
2709 btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
2710 btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
2711 btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
2712 btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
2713 BTRFS_BLOCK_RSV_DELOPS);
2714 btrfs_init_block_rsv(&fs_info->delayed_refs_rsv,
2715 BTRFS_BLOCK_RSV_DELREFS);
2716
2717 atomic_set(&fs_info->async_delalloc_pages, 0);
2718 atomic_set(&fs_info->defrag_running, 0);
2719 atomic_set(&fs_info->reada_works_cnt, 0);
2720 atomic_set(&fs_info->nr_delayed_iputs, 0);
2721 atomic64_set(&fs_info->tree_mod_seq, 0);
2722 fs_info->sb = sb;
2723 fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
2724 fs_info->metadata_ratio = 0;
2725 fs_info->defrag_inodes = RB_ROOT;
2726 atomic64_set(&fs_info->free_chunk_space, 0);
2727 fs_info->tree_mod_log = RB_ROOT;
2728 fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
2729 fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6;
2730
2731 INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
2732 spin_lock_init(&fs_info->reada_lock);
2733 btrfs_init_ref_verify(fs_info);
2734
2735 fs_info->thread_pool_size = min_t(unsigned long,
2736 num_online_cpus() + 2, 8);
2737
2738 INIT_LIST_HEAD(&fs_info->ordered_roots);
2739 spin_lock_init(&fs_info->ordered_root_lock);
2740
2741 fs_info->btree_inode = new_inode(sb);
2742 if (!fs_info->btree_inode) {
2743 err = -ENOMEM;
2744 goto fail_bio_counter;
2745 }
2746 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
2747
2748 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
2749 GFP_KERNEL);
2750 if (!fs_info->delayed_root) {
2751 err = -ENOMEM;
2752 goto fail_iput;
2753 }
2754 btrfs_init_delayed_root(fs_info->delayed_root);
2755
2756 btrfs_init_scrub(fs_info);
2757#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2758 fs_info->check_integrity_print_mask = 0;
2759#endif
2760 btrfs_init_balance(fs_info);
2761 btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work);
2762
2763 sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
2764 sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
2765
2766 btrfs_init_btree_inode(fs_info);
2767
2768 spin_lock_init(&fs_info->block_group_cache_lock);
2769 fs_info->block_group_cache_tree = RB_ROOT;
2770 fs_info->first_logical_byte = (u64)-1;
2771
2772 extent_io_tree_init(fs_info, &fs_info->freed_extents[0],
2773 IO_TREE_FS_INFO_FREED_EXTENTS0, NULL);
2774 extent_io_tree_init(fs_info, &fs_info->freed_extents[1],
2775 IO_TREE_FS_INFO_FREED_EXTENTS1, NULL);
2776 fs_info->pinned_extents = &fs_info->freed_extents[0];
2777 set_bit(BTRFS_FS_BARRIER, &fs_info->flags);
2778
2779 mutex_init(&fs_info->ordered_operations_mutex);
2780 mutex_init(&fs_info->tree_log_mutex);
2781 mutex_init(&fs_info->chunk_mutex);
2782 mutex_init(&fs_info->transaction_kthread_mutex);
2783 mutex_init(&fs_info->cleaner_mutex);
2784 mutex_init(&fs_info->ro_block_group_mutex);
2785 init_rwsem(&fs_info->commit_root_sem);
2786 init_rwsem(&fs_info->cleanup_work_sem);
2787 init_rwsem(&fs_info->subvol_sem);
2788 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
2789
2790 btrfs_init_dev_replace_locks(fs_info);
2791 btrfs_init_qgroup(fs_info);
2792
2793 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
2794 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
2795
2796 init_waitqueue_head(&fs_info->transaction_throttle);
2797 init_waitqueue_head(&fs_info->transaction_wait);
2798 init_waitqueue_head(&fs_info->transaction_blocked_wait);
2799 init_waitqueue_head(&fs_info->async_submit_wait);
2800 init_waitqueue_head(&fs_info->delayed_iputs_wait);
2801
2802
2803 fs_info->nodesize = 4096;
2804 fs_info->sectorsize = 4096;
2805 fs_info->stripesize = 4096;
2806
2807 spin_lock_init(&fs_info->swapfile_pins_lock);
2808 fs_info->swapfile_pins = RB_ROOT;
2809
2810 fs_info->send_in_progress = 0;
2811
2812 ret = btrfs_alloc_stripe_hash_table(fs_info);
2813 if (ret) {
2814 err = ret;
2815 goto fail_alloc;
2816 }
2817
2818 __setup_root(tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
2819
2820 invalidate_bdev(fs_devices->latest_bdev);
2821
2822
2823
2824
2825 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
2826 if (IS_ERR(bh)) {
2827 err = PTR_ERR(bh);
2828 goto fail_alloc;
2829 }
2830
2831
2832
2833
2834
2835 csum_type = btrfs_super_csum_type((struct btrfs_super_block *)bh->b_data);
2836 if (!btrfs_supported_super_csum(csum_type)) {
2837 btrfs_err(fs_info, "unsupported checksum algorithm: %u",
2838 csum_type);
2839 err = -EINVAL;
2840 brelse(bh);
2841 goto fail_alloc;
2842 }
2843
2844 ret = btrfs_init_csum_hash(fs_info, csum_type);
2845 if (ret) {
2846 err = ret;
2847 goto fail_alloc;
2848 }
2849
2850
2851
2852
2853
2854 if (btrfs_check_super_csum(fs_info, bh->b_data)) {
2855 btrfs_err(fs_info, "superblock checksum mismatch");
2856 err = -EINVAL;
2857 brelse(bh);
2858 goto fail_csum;
2859 }
2860
2861
2862
2863
2864
2865
2866 memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy));
2867 brelse(bh);
2868
2869 disk_super = fs_info->super_copy;
2870
2871 ASSERT(!memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid,
2872 BTRFS_FSID_SIZE));
2873
2874 if (btrfs_fs_incompat(fs_info, METADATA_UUID)) {
2875 ASSERT(!memcmp(fs_info->fs_devices->metadata_uuid,
2876 fs_info->super_copy->metadata_uuid,
2877 BTRFS_FSID_SIZE));
2878 }
2879
2880 features = btrfs_super_flags(disk_super);
2881 if (features & BTRFS_SUPER_FLAG_CHANGING_FSID_V2) {
2882 features &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
2883 btrfs_set_super_flags(disk_super, features);
2884 btrfs_info(fs_info,
2885 "found metadata UUID change in progress flag, clearing");
2886 }
2887
2888 memcpy(fs_info->super_for_commit, fs_info->super_copy,
2889 sizeof(*fs_info->super_for_commit));
2890
2891 ret = btrfs_validate_mount_super(fs_info);
2892 if (ret) {
2893 btrfs_err(fs_info, "superblock contains fatal errors");
2894 err = -EINVAL;
2895 goto fail_csum;
2896 }
2897
2898 if (!btrfs_super_root(disk_super))
2899 goto fail_csum;
2900
2901
2902 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
2903 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
2904
2905
2906
2907
2908
2909 generation = btrfs_super_generation(disk_super);
2910 find_oldest_super_backup(fs_info, generation);
2911
2912
2913
2914
2915
2916 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
2917
2918 ret = btrfs_parse_options(fs_info, options, sb->s_flags);
2919 if (ret) {
2920 err = ret;
2921 goto fail_csum;
2922 }
2923
2924 features = btrfs_super_incompat_flags(disk_super) &
2925 ~BTRFS_FEATURE_INCOMPAT_SUPP;
2926 if (features) {
2927 btrfs_err(fs_info,
2928 "cannot mount because of unsupported optional features (%llx)",
2929 features);
2930 err = -EINVAL;
2931 goto fail_csum;
2932 }
2933
2934 features = btrfs_super_incompat_flags(disk_super);
2935 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
2936 if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
2937 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
2938 else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD)
2939 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD;
2940
2941 if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
2942 btrfs_info(fs_info, "has skinny extents");
2943
2944
2945
2946
2947
2948 if (btrfs_super_nodesize(disk_super) > PAGE_SIZE) {
2949 if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
2950 btrfs_info(fs_info,
2951 "flagging fs with big metadata feature");
2952 features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
2953 }
2954
2955 nodesize = btrfs_super_nodesize(disk_super);
2956 sectorsize = btrfs_super_sectorsize(disk_super);
2957 stripesize = sectorsize;
2958 fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
2959 fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
2960
2961
2962 fs_info->nodesize = nodesize;
2963 fs_info->sectorsize = sectorsize;
2964 fs_info->stripesize = stripesize;
2965
2966
2967
2968
2969
2970 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
2971 (sectorsize != nodesize)) {
2972 btrfs_err(fs_info,
2973"unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
2974 nodesize, sectorsize);
2975 goto fail_csum;
2976 }
2977
2978
2979
2980
2981
2982 btrfs_set_super_incompat_flags(disk_super, features);
2983
2984 features = btrfs_super_compat_ro_flags(disk_super) &
2985 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
2986 if (!sb_rdonly(sb) && features) {
2987 btrfs_err(fs_info,
2988 "cannot mount read-write because of unsupported optional features (%llx)",
2989 features);
2990 err = -EINVAL;
2991 goto fail_csum;
2992 }
2993
2994 ret = btrfs_init_workqueues(fs_info, fs_devices);
2995 if (ret) {
2996 err = ret;
2997 goto fail_sb_buffer;
2998 }
2999
3000 sb->s_bdi->congested_fn = btrfs_congested_fn;
3001 sb->s_bdi->congested_data = fs_info;
3002 sb->s_bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK;
3003 sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
3004 sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
3005 sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
3006
3007 sb->s_blocksize = sectorsize;
3008 sb->s_blocksize_bits = blksize_bits(sectorsize);
3009 memcpy(&sb->s_uuid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE);
3010
3011 mutex_lock(&fs_info->chunk_mutex);
3012 ret = btrfs_read_sys_array(fs_info);
3013 mutex_unlock(&fs_info->chunk_mutex);
3014 if (ret) {
3015 btrfs_err(fs_info, "failed to read the system array: %d", ret);
3016 goto fail_sb_buffer;
3017 }
3018
3019 generation = btrfs_super_chunk_root_generation(disk_super);
3020 level = btrfs_super_chunk_root_level(disk_super);
3021
3022 __setup_root(chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
3023
3024 chunk_root->node = read_tree_block(fs_info,
3025 btrfs_super_chunk_root(disk_super),
3026 generation, level, NULL);
3027 if (IS_ERR(chunk_root->node) ||
3028 !extent_buffer_uptodate(chunk_root->node)) {
3029 btrfs_err(fs_info, "failed to read chunk root");
3030 if (!IS_ERR(chunk_root->node))
3031 free_extent_buffer(chunk_root->node);
3032 chunk_root->node = NULL;
3033 goto fail_tree_roots;
3034 }
3035 btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
3036 chunk_root->commit_root = btrfs_root_node(chunk_root);
3037
3038 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
3039 btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE);
3040
3041 ret = btrfs_read_chunk_tree(fs_info);
3042 if (ret) {
3043 btrfs_err(fs_info, "failed to read chunk tree: %d", ret);
3044 goto fail_tree_roots;
3045 }
3046
3047
3048
3049
3050
3051 btrfs_free_extra_devids(fs_devices, 0);
3052
3053 if (!fs_devices->latest_bdev) {
3054 btrfs_err(fs_info, "failed to read devices");
3055 goto fail_tree_roots;
3056 }
3057
3058retry_root_backup:
3059 generation = btrfs_super_generation(disk_super);
3060 level = btrfs_super_root_level(disk_super);
3061
3062 tree_root->node = read_tree_block(fs_info,
3063 btrfs_super_root(disk_super),
3064 generation, level, NULL);
3065 if (IS_ERR(tree_root->node) ||
3066 !extent_buffer_uptodate(tree_root->node)) {
3067 btrfs_warn(fs_info, "failed to read tree root");
3068 if (!IS_ERR(tree_root->node))
3069 free_extent_buffer(tree_root->node);
3070 tree_root->node = NULL;
3071 goto recovery_tree_root;
3072 }
3073
3074 btrfs_set_root_node(&tree_root->root_item, tree_root->node);
3075 tree_root->commit_root = btrfs_root_node(tree_root);
3076 btrfs_set_root_refs(&tree_root->root_item, 1);
3077
3078 mutex_lock(&tree_root->objectid_mutex);
3079 ret = btrfs_find_highest_objectid(tree_root,
3080 &tree_root->highest_objectid);
3081 if (ret) {
3082 mutex_unlock(&tree_root->objectid_mutex);
3083 goto recovery_tree_root;
3084 }
3085
3086 ASSERT(tree_root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
3087
3088 mutex_unlock(&tree_root->objectid_mutex);
3089
3090 ret = btrfs_read_roots(fs_info);
3091 if (ret)
3092 goto recovery_tree_root;
3093
3094 fs_info->generation = generation;
3095 fs_info->last_trans_committed = generation;
3096
3097 ret = btrfs_verify_dev_extents(fs_info);
3098 if (ret) {
3099 btrfs_err(fs_info,
3100 "failed to verify dev extents against chunks: %d",
3101 ret);
3102 goto fail_block_groups;
3103 }
3104 ret = btrfs_recover_balance(fs_info);
3105 if (ret) {
3106 btrfs_err(fs_info, "failed to recover balance: %d", ret);
3107 goto fail_block_groups;
3108 }
3109
3110 ret = btrfs_init_dev_stats(fs_info);
3111 if (ret) {
3112 btrfs_err(fs_info, "failed to init dev_stats: %d", ret);
3113 goto fail_block_groups;
3114 }
3115
3116 ret = btrfs_init_dev_replace(fs_info);
3117 if (ret) {
3118 btrfs_err(fs_info, "failed to init dev_replace: %d", ret);
3119 goto fail_block_groups;
3120 }
3121
3122 btrfs_free_extra_devids(fs_devices, 1);
3123
3124 ret = btrfs_sysfs_add_fsid(fs_devices, NULL);
3125 if (ret) {
3126 btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
3127 ret);
3128 goto fail_block_groups;
3129 }
3130
3131 ret = btrfs_sysfs_add_device(fs_devices);
3132 if (ret) {
3133 btrfs_err(fs_info, "failed to init sysfs device interface: %d",
3134 ret);
3135 goto fail_fsdev_sysfs;
3136 }
3137
3138 ret = btrfs_sysfs_add_mounted(fs_info);
3139 if (ret) {
3140 btrfs_err(fs_info, "failed to init sysfs interface: %d", ret);
3141 goto fail_fsdev_sysfs;
3142 }
3143
3144 ret = btrfs_init_space_info(fs_info);
3145 if (ret) {
3146 btrfs_err(fs_info, "failed to initialize space info: %d", ret);
3147 goto fail_sysfs;
3148 }
3149
3150 ret = btrfs_read_block_groups(fs_info);
3151 if (ret) {
3152 btrfs_err(fs_info, "failed to read block groups: %d", ret);
3153 goto fail_sysfs;
3154 }
3155
3156 if (!sb_rdonly(sb) && !btrfs_check_rw_degradable(fs_info, NULL)) {
3157 btrfs_warn(fs_info,
3158 "writable mount is not allowed due to too many missing devices");
3159 goto fail_sysfs;
3160 }
3161
3162 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
3163 "btrfs-cleaner");
3164 if (IS_ERR(fs_info->cleaner_kthread))
3165 goto fail_sysfs;
3166
3167 fs_info->transaction_kthread = kthread_run(transaction_kthread,
3168 tree_root,
3169 "btrfs-transaction");
3170 if (IS_ERR(fs_info->transaction_kthread))
3171 goto fail_cleaner;
3172
3173 if (!btrfs_test_opt(fs_info, NOSSD) &&
3174 !fs_info->fs_devices->rotating) {
3175 btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
3176 }
3177
3178
3179
3180
3181
3182 btrfs_apply_pending_changes(fs_info);
3183
3184#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3185 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY)) {
3186 ret = btrfsic_mount(fs_info, fs_devices,
3187 btrfs_test_opt(fs_info,
3188 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ?
3189 1 : 0,
3190 fs_info->check_integrity_print_mask);
3191 if (ret)
3192 btrfs_warn(fs_info,
3193 "failed to initialize integrity check module: %d",
3194 ret);
3195 }
3196#endif
3197 ret = btrfs_read_qgroup_config(fs_info);
3198 if (ret)
3199 goto fail_trans_kthread;
3200
3201 if (btrfs_build_ref_tree(fs_info))
3202 btrfs_err(fs_info, "couldn't build ref tree");
3203
3204
3205 if (btrfs_super_log_root(disk_super) != 0 &&
3206 !btrfs_test_opt(fs_info, NOLOGREPLAY)) {
3207 ret = btrfs_replay_log(fs_info, fs_devices);
3208 if (ret) {
3209 err = ret;
3210 goto fail_qgroup;
3211 }
3212 }
3213
3214 ret = btrfs_find_orphan_roots(fs_info);
3215 if (ret)
3216 goto fail_qgroup;
3217
3218 if (!sb_rdonly(sb)) {
3219 ret = btrfs_cleanup_fs_roots(fs_info);
3220 if (ret)
3221 goto fail_qgroup;
3222
3223 mutex_lock(&fs_info->cleaner_mutex);
3224 ret = btrfs_recover_relocation(tree_root);
3225 mutex_unlock(&fs_info->cleaner_mutex);
3226 if (ret < 0) {
3227 btrfs_warn(fs_info, "failed to recover relocation: %d",
3228 ret);
3229 err = -EINVAL;
3230 goto fail_qgroup;
3231 }
3232 }
3233
3234 location.objectid = BTRFS_FS_TREE_OBJECTID;
3235 location.type = BTRFS_ROOT_ITEM_KEY;
3236 location.offset = 0;
3237
3238 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
3239 if (IS_ERR(fs_info->fs_root)) {
3240 err = PTR_ERR(fs_info->fs_root);
3241 btrfs_warn(fs_info, "failed to read fs tree: %d", err);
3242 goto fail_qgroup;
3243 }
3244
3245 if (sb_rdonly(sb))
3246 return 0;
3247
3248 if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
3249 btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3250 clear_free_space_tree = 1;
3251 } else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
3252 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
3253 btrfs_warn(fs_info, "free space tree is invalid");
3254 clear_free_space_tree = 1;
3255 }
3256
3257 if (clear_free_space_tree) {
3258 btrfs_info(fs_info, "clearing free space tree");
3259 ret = btrfs_clear_free_space_tree(fs_info);
3260 if (ret) {
3261 btrfs_warn(fs_info,
3262 "failed to clear free space tree: %d", ret);
3263 close_ctree(fs_info);
3264 return ret;
3265 }
3266 }
3267
3268 if (btrfs_test_opt(fs_info, FREE_SPACE_TREE) &&
3269 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3270 btrfs_info(fs_info, "creating free space tree");
3271 ret = btrfs_create_free_space_tree(fs_info);
3272 if (ret) {
3273 btrfs_warn(fs_info,
3274 "failed to create free space tree: %d", ret);
3275 close_ctree(fs_info);
3276 return ret;
3277 }
3278 }
3279
3280 down_read(&fs_info->cleanup_work_sem);
3281 if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
3282 (ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
3283 up_read(&fs_info->cleanup_work_sem);
3284 close_ctree(fs_info);
3285 return ret;
3286 }
3287 up_read(&fs_info->cleanup_work_sem);
3288
3289 ret = btrfs_resume_balance_async(fs_info);
3290 if (ret) {
3291 btrfs_warn(fs_info, "failed to resume balance: %d", ret);
3292 close_ctree(fs_info);
3293 return ret;
3294 }
3295
3296 ret = btrfs_resume_dev_replace_async(fs_info);
3297 if (ret) {
3298 btrfs_warn(fs_info, "failed to resume device replace: %d", ret);
3299 close_ctree(fs_info);
3300 return ret;
3301 }
3302
3303 btrfs_qgroup_rescan_resume(fs_info);
3304
3305 if (!fs_info->uuid_root) {
3306 btrfs_info(fs_info, "creating UUID tree");
3307 ret = btrfs_create_uuid_tree(fs_info);
3308 if (ret) {
3309 btrfs_warn(fs_info,
3310 "failed to create the UUID tree: %d", ret);
3311 close_ctree(fs_info);
3312 return ret;
3313 }
3314 } else if (btrfs_test_opt(fs_info, RESCAN_UUID_TREE) ||
3315 fs_info->generation !=
3316 btrfs_super_uuid_tree_generation(disk_super)) {
3317 btrfs_info(fs_info, "checking UUID tree");
3318 ret = btrfs_check_uuid_tree(fs_info);
3319 if (ret) {
3320 btrfs_warn(fs_info,
3321 "failed to check the UUID tree: %d", ret);
3322 close_ctree(fs_info);
3323 return ret;
3324 }
3325 } else {
3326 set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
3327 }
3328 set_bit(BTRFS_FS_OPEN, &fs_info->flags);
3329
3330
3331
3332
3333
3334 btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
3335
3336 return 0;
3337
3338fail_qgroup:
3339 btrfs_free_qgroup_config(fs_info);
3340fail_trans_kthread:
3341 kthread_stop(fs_info->transaction_kthread);
3342 btrfs_cleanup_transaction(fs_info);
3343 btrfs_free_fs_roots(fs_info);
3344fail_cleaner:
3345 kthread_stop(fs_info->cleaner_kthread);
3346
3347
3348
3349
3350
3351 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
3352
3353fail_sysfs:
3354 btrfs_sysfs_remove_mounted(fs_info);
3355
3356fail_fsdev_sysfs:
3357 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
3358
3359fail_block_groups:
3360 btrfs_put_block_group_cache(fs_info);
3361
3362fail_tree_roots:
3363 free_root_pointers(fs_info, 1);
3364 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
3365
3366fail_sb_buffer:
3367 btrfs_stop_all_workers(fs_info);
3368 btrfs_free_block_groups(fs_info);
3369fail_csum:
3370 btrfs_free_csum_hash(fs_info);
3371fail_alloc:
3372fail_iput:
3373 btrfs_mapping_tree_free(&fs_info->mapping_tree);
3374
3375 iput(fs_info->btree_inode);
3376fail_bio_counter:
3377 percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
3378fail_delalloc_bytes:
3379 percpu_counter_destroy(&fs_info->delalloc_bytes);
3380fail_dirty_metadata_bytes:
3381 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
3382fail_dio_bytes:
3383 percpu_counter_destroy(&fs_info->dio_bytes);
3384fail_srcu:
3385 cleanup_srcu_struct(&fs_info->subvol_srcu);
3386fail:
3387 btrfs_free_stripe_hash_table(fs_info);
3388 btrfs_close_devices(fs_info->fs_devices);
3389 return err;
3390
3391recovery_tree_root:
3392 if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
3393 goto fail_tree_roots;
3394
3395 free_root_pointers(fs_info, 0);
3396
3397
3398 btrfs_set_super_log_root(disk_super, 0);
3399
3400
3401 btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
3402
3403 ret = next_root_backup(fs_info, fs_info->super_copy,
3404 &num_backups_tried, &backup_index);
3405 if (ret == -1)
3406 goto fail_block_groups;
3407 goto retry_root_backup;
3408}
3409ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
3410
3411static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
3412{
3413 if (uptodate) {
3414 set_buffer_uptodate(bh);
3415 } else {
3416 struct btrfs_device *device = (struct btrfs_device *)
3417 bh->b_private;
3418
3419 btrfs_warn_rl_in_rcu(device->fs_info,
3420 "lost page write due to IO error on %s",
3421 rcu_str_deref(device->name));
3422
3423
3424
3425 clear_buffer_uptodate(bh);
3426 btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS);
3427 }
3428 unlock_buffer(bh);
3429 put_bh(bh);
3430}
3431
3432int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
3433 struct buffer_head **bh_ret)
3434{
3435 struct buffer_head *bh;
3436 struct btrfs_super_block *super;
3437 u64 bytenr;
3438
3439 bytenr = btrfs_sb_offset(copy_num);
3440 if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode))
3441 return -EINVAL;
3442
3443 bh = __bread(bdev, bytenr / BTRFS_BDEV_BLOCKSIZE, BTRFS_SUPER_INFO_SIZE);
3444
3445
3446
3447
3448 if (!bh)
3449 return -EIO;
3450
3451 super = (struct btrfs_super_block *)bh->b_data;
3452 if (btrfs_super_bytenr(super) != bytenr ||
3453 btrfs_super_magic(super) != BTRFS_MAGIC) {
3454 brelse(bh);
3455 return -EINVAL;
3456 }
3457
3458 *bh_ret = bh;
3459 return 0;
3460}
3461
3462
3463struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
3464{
3465 struct buffer_head *bh;
3466 struct buffer_head *latest = NULL;
3467 struct btrfs_super_block *super;
3468 int i;
3469 u64 transid = 0;
3470 int ret = -EINVAL;
3471
3472
3473
3474
3475
3476
3477 for (i = 0; i < 1; i++) {
3478 ret = btrfs_read_dev_one_super(bdev, i, &bh);
3479 if (ret)
3480 continue;
3481
3482 super = (struct btrfs_super_block *)bh->b_data;
3483
3484 if (!latest || btrfs_super_generation(super) > transid) {
3485 brelse(latest);
3486 latest = bh;
3487 transid = btrfs_super_generation(super);
3488 } else {
3489 brelse(bh);
3490 }
3491 }
3492
3493 if (!latest)
3494 return ERR_PTR(ret);
3495
3496 return latest;
3497}
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509static int write_dev_supers(struct btrfs_device *device,
3510 struct btrfs_super_block *sb, int max_mirrors)
3511{
3512 struct btrfs_fs_info *fs_info = device->fs_info;
3513 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
3514 struct buffer_head *bh;
3515 int i;
3516 int ret;
3517 int errors = 0;
3518 u64 bytenr;
3519 int op_flags;
3520
3521 if (max_mirrors == 0)
3522 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
3523
3524 shash->tfm = fs_info->csum_shash;
3525
3526 for (i = 0; i < max_mirrors; i++) {
3527 bytenr = btrfs_sb_offset(i);
3528 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
3529 device->commit_total_bytes)
3530 break;
3531
3532 btrfs_set_super_bytenr(sb, bytenr);
3533
3534 crypto_shash_init(shash);
3535 crypto_shash_update(shash, (const char *)sb + BTRFS_CSUM_SIZE,
3536 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
3537 crypto_shash_final(shash, sb->csum);
3538
3539
3540 bh = __getblk(device->bdev, bytenr / BTRFS_BDEV_BLOCKSIZE,
3541 BTRFS_SUPER_INFO_SIZE);
3542 if (!bh) {
3543 btrfs_err(device->fs_info,
3544 "couldn't get super buffer head for bytenr %llu",
3545 bytenr);
3546 errors++;
3547 continue;
3548 }
3549
3550 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
3551
3552
3553 get_bh(bh);
3554
3555 set_buffer_uptodate(bh);
3556 lock_buffer(bh);
3557 bh->b_end_io = btrfs_end_buffer_write_sync;
3558 bh->b_private = device;
3559
3560
3561
3562
3563
3564 op_flags = REQ_SYNC | REQ_META | REQ_PRIO;
3565 if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER))
3566 op_flags |= REQ_FUA;
3567 ret = btrfsic_submit_bh(REQ_OP_WRITE, op_flags, bh);
3568 if (ret)
3569 errors++;
3570 }
3571 return errors < i ? 0 : -1;
3572}
3573
3574
3575
3576
3577
3578
3579
3580
3581static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
3582{
3583 struct buffer_head *bh;
3584 int i;
3585 int errors = 0;
3586 bool primary_failed = false;
3587 u64 bytenr;
3588
3589 if (max_mirrors == 0)
3590 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
3591
3592 for (i = 0; i < max_mirrors; i++) {
3593 bytenr = btrfs_sb_offset(i);
3594 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
3595 device->commit_total_bytes)
3596 break;
3597
3598 bh = __find_get_block(device->bdev,
3599 bytenr / BTRFS_BDEV_BLOCKSIZE,
3600 BTRFS_SUPER_INFO_SIZE);
3601 if (!bh) {
3602 errors++;
3603 if (i == 0)
3604 primary_failed = true;
3605 continue;
3606 }
3607 wait_on_buffer(bh);
3608 if (!buffer_uptodate(bh)) {
3609 errors++;
3610 if (i == 0)
3611 primary_failed = true;
3612 }
3613
3614
3615 brelse(bh);
3616
3617
3618 brelse(bh);
3619 }
3620
3621
3622 if (primary_failed) {
3623 btrfs_err(device->fs_info, "error writing primary super block to device %llu",
3624 device->devid);
3625 return -1;
3626 }
3627
3628 return errors < i ? 0 : -1;
3629}
3630
3631
3632
3633
3634
3635static void btrfs_end_empty_barrier(struct bio *bio)
3636{
3637 complete(bio->bi_private);
3638}
3639
3640
3641
3642
3643
3644static void write_dev_flush(struct btrfs_device *device)
3645{
3646 struct request_queue *q = bdev_get_queue(device->bdev);
3647 struct bio *bio = device->flush_bio;
3648
3649 if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
3650 return;
3651
3652 bio_reset(bio);
3653 bio->bi_end_io = btrfs_end_empty_barrier;
3654 bio_set_dev(bio, device->bdev);
3655 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH;
3656 init_completion(&device->flush_wait);
3657 bio->bi_private = &device->flush_wait;
3658
3659 btrfsic_submit_bio(bio);
3660 set_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
3661}
3662
3663
3664
3665
3666static blk_status_t wait_dev_flush(struct btrfs_device *device)
3667{
3668 struct bio *bio = device->flush_bio;
3669
3670 if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
3671 return BLK_STS_OK;
3672
3673 clear_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
3674 wait_for_completion_io(&device->flush_wait);
3675
3676 return bio->bi_status;
3677}
3678
3679static int check_barrier_error(struct btrfs_fs_info *fs_info)
3680{
3681 if (!btrfs_check_rw_degradable(fs_info, NULL))
3682 return -EIO;
3683 return 0;
3684}
3685
3686
3687
3688
3689
3690static int barrier_all_devices(struct btrfs_fs_info *info)
3691{
3692 struct list_head *head;
3693 struct btrfs_device *dev;
3694 int errors_wait = 0;
3695 blk_status_t ret;
3696
3697 lockdep_assert_held(&info->fs_devices->device_list_mutex);
3698
3699 head = &info->fs_devices->devices;
3700 list_for_each_entry(dev, head, dev_list) {
3701 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
3702 continue;
3703 if (!dev->bdev)
3704 continue;
3705 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3706 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3707 continue;
3708
3709 write_dev_flush(dev);
3710 dev->last_flush_error = BLK_STS_OK;
3711 }
3712
3713
3714 list_for_each_entry(dev, head, dev_list) {
3715 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
3716 continue;
3717 if (!dev->bdev) {
3718 errors_wait++;
3719 continue;
3720 }
3721 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3722 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3723 continue;
3724
3725 ret = wait_dev_flush(dev);
3726 if (ret) {
3727 dev->last_flush_error = ret;
3728 btrfs_dev_stat_inc_and_print(dev,
3729 BTRFS_DEV_STAT_FLUSH_ERRS);
3730 errors_wait++;
3731 }
3732 }
3733
3734 if (errors_wait) {
3735
3736
3737
3738
3739
3740 return check_barrier_error(info);
3741 }
3742 return 0;
3743}
3744
3745int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
3746{
3747 int raid_type;
3748 int min_tolerated = INT_MAX;
3749
3750 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 ||
3751 (flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE))
3752 min_tolerated = min_t(int, min_tolerated,
3753 btrfs_raid_array[BTRFS_RAID_SINGLE].
3754 tolerated_failures);
3755
3756 for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
3757 if (raid_type == BTRFS_RAID_SINGLE)
3758 continue;
3759 if (!(flags & btrfs_raid_array[raid_type].bg_flag))
3760 continue;
3761 min_tolerated = min_t(int, min_tolerated,
3762 btrfs_raid_array[raid_type].
3763 tolerated_failures);
3764 }
3765
3766 if (min_tolerated == INT_MAX) {
3767 pr_warn("BTRFS: unknown raid flag: %llu", flags);
3768 min_tolerated = 0;
3769 }
3770
3771 return min_tolerated;
3772}
3773
3774int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
3775{
3776 struct list_head *head;
3777 struct btrfs_device *dev;
3778 struct btrfs_super_block *sb;
3779 struct btrfs_dev_item *dev_item;
3780 int ret;
3781 int do_barriers;
3782 int max_errors;
3783 int total_errors = 0;
3784 u64 flags;
3785
3786 do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);
3787
3788
3789
3790
3791
3792
3793 if (max_mirrors == 0)
3794 backup_super_roots(fs_info);
3795
3796 sb = fs_info->super_for_commit;
3797 dev_item = &sb->dev_item;
3798
3799 mutex_lock(&fs_info->fs_devices->device_list_mutex);
3800 head = &fs_info->fs_devices->devices;
3801 max_errors = btrfs_super_num_devices(fs_info->super_copy) - 1;
3802
3803 if (do_barriers) {
3804 ret = barrier_all_devices(fs_info);
3805 if (ret) {
3806 mutex_unlock(
3807 &fs_info->fs_devices->device_list_mutex);
3808 btrfs_handle_fs_error(fs_info, ret,
3809 "errors while submitting device barriers.");
3810 return ret;
3811 }
3812 }
3813
3814 list_for_each_entry(dev, head, dev_list) {
3815 if (!dev->bdev) {
3816 total_errors++;
3817 continue;
3818 }
3819 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3820 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3821 continue;
3822
3823 btrfs_set_stack_device_generation(dev_item, 0);
3824 btrfs_set_stack_device_type(dev_item, dev->type);
3825 btrfs_set_stack_device_id(dev_item, dev->devid);
3826 btrfs_set_stack_device_total_bytes(dev_item,
3827 dev->commit_total_bytes);
3828 btrfs_set_stack_device_bytes_used(dev_item,
3829 dev->commit_bytes_used);
3830 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
3831 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
3832 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
3833 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
3834 memcpy(dev_item->fsid, dev->fs_devices->metadata_uuid,
3835 BTRFS_FSID_SIZE);
3836
3837 flags = btrfs_super_flags(sb);
3838 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
3839
3840 ret = btrfs_validate_write_super(fs_info, sb);
3841 if (ret < 0) {
3842 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3843 btrfs_handle_fs_error(fs_info, -EUCLEAN,
3844 "unexpected superblock corruption detected");
3845 return -EUCLEAN;
3846 }
3847
3848 ret = write_dev_supers(dev, sb, max_mirrors);
3849 if (ret)
3850 total_errors++;
3851 }
3852 if (total_errors > max_errors) {
3853 btrfs_err(fs_info, "%d errors while writing supers",
3854 total_errors);
3855 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3856
3857
3858 btrfs_handle_fs_error(fs_info, -EIO,
3859 "%d errors while writing supers",
3860 total_errors);
3861 return -EIO;
3862 }
3863
3864 total_errors = 0;
3865 list_for_each_entry(dev, head, dev_list) {
3866 if (!dev->bdev)
3867 continue;
3868 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3869 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3870 continue;
3871
3872 ret = wait_dev_supers(dev, max_mirrors);
3873 if (ret)
3874 total_errors++;
3875 }
3876 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3877 if (total_errors > max_errors) {
3878 btrfs_handle_fs_error(fs_info, -EIO,
3879 "%d errors while writing supers",
3880 total_errors);
3881 return -EIO;
3882 }
3883 return 0;
3884}
3885
3886
3887void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
3888 struct btrfs_root *root)
3889{
3890 spin_lock(&fs_info->fs_roots_radix_lock);
3891 radix_tree_delete(&fs_info->fs_roots_radix,
3892 (unsigned long)root->root_key.objectid);
3893 spin_unlock(&fs_info->fs_roots_radix_lock);
3894
3895 if (btrfs_root_refs(&root->root_item) == 0)
3896 synchronize_srcu(&fs_info->subvol_srcu);
3897
3898 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
3899 btrfs_free_log(NULL, root);
3900 if (root->reloc_root) {
3901 free_extent_buffer(root->reloc_root->node);
3902 free_extent_buffer(root->reloc_root->commit_root);
3903 btrfs_put_fs_root(root->reloc_root);
3904 root->reloc_root = NULL;
3905 }
3906 }
3907
3908 if (root->free_ino_pinned)
3909 __btrfs_remove_free_space_cache(root->free_ino_pinned);
3910 if (root->free_ino_ctl)
3911 __btrfs_remove_free_space_cache(root->free_ino_ctl);
3912 btrfs_free_fs_root(root);
3913}
3914
3915void btrfs_free_fs_root(struct btrfs_root *root)
3916{
3917 iput(root->ino_cache_inode);
3918 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
3919 if (root->anon_dev)
3920 free_anon_bdev(root->anon_dev);
3921 if (root->subv_writers)
3922 btrfs_free_subvolume_writers(root->subv_writers);
3923 free_extent_buffer(root->node);
3924 free_extent_buffer(root->commit_root);
3925 kfree(root->free_ino_ctl);
3926 kfree(root->free_ino_pinned);
3927 btrfs_put_fs_root(root);
3928}
3929
3930int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
3931{
3932 u64 root_objectid = 0;
3933 struct btrfs_root *gang[8];
3934 int i = 0;
3935 int err = 0;
3936 unsigned int ret = 0;
3937 int index;
3938
3939 while (1) {
3940 index = srcu_read_lock(&fs_info->subvol_srcu);
3941 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
3942 (void **)gang, root_objectid,
3943 ARRAY_SIZE(gang));
3944 if (!ret) {
3945 srcu_read_unlock(&fs_info->subvol_srcu, index);
3946 break;
3947 }
3948 root_objectid = gang[ret - 1]->root_key.objectid + 1;
3949
3950 for (i = 0; i < ret; i++) {
3951
3952 if (btrfs_root_refs(&gang[i]->root_item) == 0) {
3953 gang[i] = NULL;
3954 continue;
3955 }
3956
3957 gang[i] = btrfs_grab_fs_root(gang[i]);
3958 }
3959 srcu_read_unlock(&fs_info->subvol_srcu, index);
3960
3961 for (i = 0; i < ret; i++) {
3962 if (!gang[i])
3963 continue;
3964 root_objectid = gang[i]->root_key.objectid;
3965 err = btrfs_orphan_cleanup(gang[i]);
3966 if (err)
3967 break;
3968 btrfs_put_fs_root(gang[i]);
3969 }
3970 root_objectid++;
3971 }
3972
3973
3974 for (; i < ret; i++) {
3975 if (gang[i])
3976 btrfs_put_fs_root(gang[i]);
3977 }
3978 return err;
3979}
3980
3981int btrfs_commit_super(struct btrfs_fs_info *fs_info)
3982{
3983 struct btrfs_root *root = fs_info->tree_root;
3984 struct btrfs_trans_handle *trans;
3985
3986 mutex_lock(&fs_info->cleaner_mutex);
3987 btrfs_run_delayed_iputs(fs_info);
3988 mutex_unlock(&fs_info->cleaner_mutex);
3989 wake_up_process(fs_info->cleaner_kthread);
3990
3991
3992 down_write(&fs_info->cleanup_work_sem);
3993 up_write(&fs_info->cleanup_work_sem);
3994
3995 trans = btrfs_join_transaction(root);
3996 if (IS_ERR(trans))
3997 return PTR_ERR(trans);
3998 return btrfs_commit_transaction(trans);
3999}
4000
4001void close_ctree(struct btrfs_fs_info *fs_info)
4002{
4003 int ret;
4004
4005 set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
4006
4007
4008
4009
4010
4011
4012 kthread_park(fs_info->cleaner_kthread);
4013
4014
4015 btrfs_qgroup_wait_for_completion(fs_info, false);
4016
4017
4018 down(&fs_info->uuid_tree_rescan_sem);
4019
4020 up(&fs_info->uuid_tree_rescan_sem);
4021
4022
4023 btrfs_pause_balance(fs_info);
4024
4025 btrfs_dev_replace_suspend_for_unmount(fs_info);
4026
4027 btrfs_scrub_cancel(fs_info);
4028
4029
4030 wait_event(fs_info->transaction_wait,
4031 (atomic_read(&fs_info->defrag_running) == 0));
4032
4033
4034 btrfs_cleanup_defrag_inodes(fs_info);
4035
4036 cancel_work_sync(&fs_info->async_reclaim_work);
4037
4038 if (!sb_rdonly(fs_info->sb)) {
4039
4040
4041
4042
4043 btrfs_delete_unused_bgs(fs_info);
4044
4045 ret = btrfs_commit_super(fs_info);
4046 if (ret)
4047 btrfs_err(fs_info, "commit super ret %d", ret);
4048 }
4049
4050 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state) ||
4051 test_bit(BTRFS_FS_STATE_TRANS_ABORTED, &fs_info->fs_state))
4052 btrfs_error_commit_super(fs_info);
4053
4054 kthread_stop(fs_info->transaction_kthread);
4055 kthread_stop(fs_info->cleaner_kthread);
4056
4057 ASSERT(list_empty(&fs_info->delayed_iputs));
4058 set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
4059
4060 btrfs_free_qgroup_config(fs_info);
4061 ASSERT(list_empty(&fs_info->delalloc_roots));
4062
4063 if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
4064 btrfs_info(fs_info, "at unmount delalloc count %lld",
4065 percpu_counter_sum(&fs_info->delalloc_bytes));
4066 }
4067
4068 if (percpu_counter_sum(&fs_info->dio_bytes))
4069 btrfs_info(fs_info, "at unmount dio bytes count %lld",
4070 percpu_counter_sum(&fs_info->dio_bytes));
4071
4072 btrfs_sysfs_remove_mounted(fs_info);
4073 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
4074
4075 btrfs_free_fs_roots(fs_info);
4076
4077 btrfs_put_block_group_cache(fs_info);
4078
4079
4080
4081
4082
4083 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
4084 btrfs_stop_all_workers(fs_info);
4085
4086 btrfs_free_block_groups(fs_info);
4087
4088 clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
4089 free_root_pointers(fs_info, 1);
4090
4091 iput(fs_info->btree_inode);
4092
4093#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4094 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY))
4095 btrfsic_unmount(fs_info->fs_devices);
4096#endif
4097
4098 btrfs_mapping_tree_free(&fs_info->mapping_tree);
4099 btrfs_close_devices(fs_info->fs_devices);
4100
4101 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
4102 percpu_counter_destroy(&fs_info->delalloc_bytes);
4103 percpu_counter_destroy(&fs_info->dio_bytes);
4104 percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
4105 cleanup_srcu_struct(&fs_info->subvol_srcu);
4106
4107 btrfs_free_csum_hash(fs_info);
4108 btrfs_free_stripe_hash_table(fs_info);
4109 btrfs_free_ref_cache(fs_info);
4110}
4111
4112int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
4113 int atomic)
4114{
4115 int ret;
4116 struct inode *btree_inode = buf->pages[0]->mapping->host;
4117
4118 ret = extent_buffer_uptodate(buf);
4119 if (!ret)
4120 return ret;
4121
4122 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
4123 parent_transid, atomic);
4124 if (ret == -EAGAIN)
4125 return ret;
4126 return !ret;
4127}
4128
4129void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
4130{
4131 struct btrfs_fs_info *fs_info;
4132 struct btrfs_root *root;
4133 u64 transid = btrfs_header_generation(buf);
4134 int was_dirty;
4135
4136#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4137
4138
4139
4140
4141
4142 if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &buf->bflags)))
4143 return;
4144#endif
4145 root = BTRFS_I(buf->pages[0]->mapping->host)->root;
4146 fs_info = root->fs_info;
4147 btrfs_assert_tree_locked(buf);
4148 if (transid != fs_info->generation)
4149 WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n",
4150 buf->start, transid, fs_info->generation);
4151 was_dirty = set_extent_buffer_dirty(buf);
4152 if (!was_dirty)
4153 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
4154 buf->len,
4155 fs_info->dirty_metadata_batch);
4156#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4157
4158
4159
4160
4161
4162 if (btrfs_header_level(buf) == 0 &&
4163 btrfs_check_leaf_relaxed(buf)) {
4164 btrfs_print_leaf(buf);
4165 ASSERT(0);
4166 }
4167#endif
4168}
4169
4170static void __btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info,
4171 int flush_delayed)
4172{
4173
4174
4175
4176
4177 int ret;
4178
4179 if (current->flags & PF_MEMALLOC)
4180 return;
4181
4182 if (flush_delayed)
4183 btrfs_balance_delayed_items(fs_info);
4184
4185 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
4186 BTRFS_DIRTY_METADATA_THRESH,
4187 fs_info->dirty_metadata_batch);
4188 if (ret > 0) {
4189 balance_dirty_pages_ratelimited(fs_info->btree_inode->i_mapping);
4190 }
4191}
4192
4193void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info)
4194{
4195 __btrfs_btree_balance_dirty(fs_info, 1);
4196}
4197
4198void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info)
4199{
4200 __btrfs_btree_balance_dirty(fs_info, 0);
4201}
4202
4203int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
4204 struct btrfs_key *first_key)
4205{
4206 return btree_read_extent_buffer_pages(buf, parent_transid,
4207 level, first_key);
4208}
4209
4210static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info)
4211{
4212
4213 btrfs_cleanup_transaction(fs_info);
4214
4215 mutex_lock(&fs_info->cleaner_mutex);
4216 btrfs_run_delayed_iputs(fs_info);
4217 mutex_unlock(&fs_info->cleaner_mutex);
4218
4219 down_write(&fs_info->cleanup_work_sem);
4220 up_write(&fs_info->cleanup_work_sem);
4221}
4222
4223static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
4224{
4225 struct btrfs_ordered_extent *ordered;
4226
4227 spin_lock(&root->ordered_extent_lock);
4228
4229
4230
4231
4232 list_for_each_entry(ordered, &root->ordered_extents,
4233 root_extent_list)
4234 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
4235 spin_unlock(&root->ordered_extent_lock);
4236}
4237
4238static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
4239{
4240 struct btrfs_root *root;
4241 struct list_head splice;
4242
4243 INIT_LIST_HEAD(&splice);
4244
4245 spin_lock(&fs_info->ordered_root_lock);
4246 list_splice_init(&fs_info->ordered_roots, &splice);
4247 while (!list_empty(&splice)) {
4248 root = list_first_entry(&splice, struct btrfs_root,
4249 ordered_root);
4250 list_move_tail(&root->ordered_root,
4251 &fs_info->ordered_roots);
4252
4253 spin_unlock(&fs_info->ordered_root_lock);
4254 btrfs_destroy_ordered_extents(root);
4255
4256 cond_resched();
4257 spin_lock(&fs_info->ordered_root_lock);
4258 }
4259 spin_unlock(&fs_info->ordered_root_lock);
4260
4261
4262
4263
4264
4265
4266
4267 btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
4268}
4269
4270static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
4271 struct btrfs_fs_info *fs_info)
4272{
4273 struct rb_node *node;
4274 struct btrfs_delayed_ref_root *delayed_refs;
4275 struct btrfs_delayed_ref_node *ref;
4276 int ret = 0;
4277
4278 delayed_refs = &trans->delayed_refs;
4279
4280 spin_lock(&delayed_refs->lock);
4281 if (atomic_read(&delayed_refs->num_entries) == 0) {
4282 spin_unlock(&delayed_refs->lock);
4283 btrfs_info(fs_info, "delayed_refs has NO entry");
4284 return ret;
4285 }
4286
4287 while ((node = rb_first_cached(&delayed_refs->href_root)) != NULL) {
4288 struct btrfs_delayed_ref_head *head;
4289 struct rb_node *n;
4290 bool pin_bytes = false;
4291
4292 head = rb_entry(node, struct btrfs_delayed_ref_head,
4293 href_node);
4294 if (btrfs_delayed_ref_lock(delayed_refs, head))
4295 continue;
4296
4297 spin_lock(&head->lock);
4298 while ((n = rb_first_cached(&head->ref_tree)) != NULL) {
4299 ref = rb_entry(n, struct btrfs_delayed_ref_node,
4300 ref_node);
4301 ref->in_tree = 0;
4302 rb_erase_cached(&ref->ref_node, &head->ref_tree);
4303 RB_CLEAR_NODE(&ref->ref_node);
4304 if (!list_empty(&ref->add_list))
4305 list_del(&ref->add_list);
4306 atomic_dec(&delayed_refs->num_entries);
4307 btrfs_put_delayed_ref(ref);
4308 }
4309 if (head->must_insert_reserved)
4310 pin_bytes = true;
4311 btrfs_free_delayed_extent_op(head->extent_op);
4312 btrfs_delete_ref_head(delayed_refs, head);
4313 spin_unlock(&head->lock);
4314 spin_unlock(&delayed_refs->lock);
4315 mutex_unlock(&head->mutex);
4316
4317 if (pin_bytes)
4318 btrfs_pin_extent(fs_info, head->bytenr,
4319 head->num_bytes, 1);
4320 btrfs_cleanup_ref_head_accounting(fs_info, delayed_refs, head);
4321 btrfs_put_delayed_ref_head(head);
4322 cond_resched();
4323 spin_lock(&delayed_refs->lock);
4324 }
4325
4326 spin_unlock(&delayed_refs->lock);
4327
4328 return ret;
4329}
4330
4331static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
4332{
4333 struct btrfs_inode *btrfs_inode;
4334 struct list_head splice;
4335
4336 INIT_LIST_HEAD(&splice);
4337
4338 spin_lock(&root->delalloc_lock);
4339 list_splice_init(&root->delalloc_inodes, &splice);
4340
4341 while (!list_empty(&splice)) {
4342 struct inode *inode = NULL;
4343 btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
4344 delalloc_inodes);
4345 __btrfs_del_delalloc_inode(root, btrfs_inode);
4346 spin_unlock(&root->delalloc_lock);
4347
4348
4349
4350
4351
4352 inode = igrab(&btrfs_inode->vfs_inode);
4353 if (inode) {
4354 invalidate_inode_pages2(inode->i_mapping);
4355 iput(inode);
4356 }
4357 spin_lock(&root->delalloc_lock);
4358 }
4359 spin_unlock(&root->delalloc_lock);
4360}
4361
4362static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
4363{
4364 struct btrfs_root *root;
4365 struct list_head splice;
4366
4367 INIT_LIST_HEAD(&splice);
4368
4369 spin_lock(&fs_info->delalloc_root_lock);
4370 list_splice_init(&fs_info->delalloc_roots, &splice);
4371 while (!list_empty(&splice)) {
4372 root = list_first_entry(&splice, struct btrfs_root,
4373 delalloc_root);
4374 root = btrfs_grab_fs_root(root);
4375 BUG_ON(!root);
4376 spin_unlock(&fs_info->delalloc_root_lock);
4377
4378 btrfs_destroy_delalloc_inodes(root);
4379 btrfs_put_fs_root(root);
4380
4381 spin_lock(&fs_info->delalloc_root_lock);
4382 }
4383 spin_unlock(&fs_info->delalloc_root_lock);
4384}
4385
4386static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
4387 struct extent_io_tree *dirty_pages,
4388 int mark)
4389{
4390 int ret;
4391 struct extent_buffer *eb;
4392 u64 start = 0;
4393 u64 end;
4394
4395 while (1) {
4396 ret = find_first_extent_bit(dirty_pages, start, &start, &end,
4397 mark, NULL);
4398 if (ret)
4399 break;
4400
4401 clear_extent_bits(dirty_pages, start, end, mark);
4402 while (start <= end) {
4403 eb = find_extent_buffer(fs_info, start);
4404 start += fs_info->nodesize;
4405 if (!eb)
4406 continue;
4407 wait_on_extent_buffer_writeback(eb);
4408
4409 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
4410 &eb->bflags))
4411 clear_extent_buffer_dirty(eb);
4412 free_extent_buffer_stale(eb);
4413 }
4414 }
4415
4416 return ret;
4417}
4418
4419static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
4420 struct extent_io_tree *pinned_extents)
4421{
4422 struct extent_io_tree *unpin;
4423 u64 start;
4424 u64 end;
4425 int ret;
4426 bool loop = true;
4427
4428 unpin = pinned_extents;
4429again:
4430 while (1) {
4431 struct extent_state *cached_state = NULL;
4432
4433
4434
4435
4436
4437
4438
4439 mutex_lock(&fs_info->unused_bg_unpin_mutex);
4440 ret = find_first_extent_bit(unpin, 0, &start, &end,
4441 EXTENT_DIRTY, &cached_state);
4442 if (ret) {
4443 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
4444 break;
4445 }
4446
4447 clear_extent_dirty(unpin, start, end, &cached_state);
4448 free_extent_state(cached_state);
4449 btrfs_error_unpin_extent_range(fs_info, start, end);
4450 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
4451 cond_resched();
4452 }
4453
4454 if (loop) {
4455 if (unpin == &fs_info->freed_extents[0])
4456 unpin = &fs_info->freed_extents[1];
4457 else
4458 unpin = &fs_info->freed_extents[0];
4459 loop = false;
4460 goto again;
4461 }
4462
4463 return 0;
4464}
4465
4466static void btrfs_cleanup_bg_io(struct btrfs_block_group_cache *cache)
4467{
4468 struct inode *inode;
4469
4470 inode = cache->io_ctl.inode;
4471 if (inode) {
4472 invalidate_inode_pages2(inode->i_mapping);
4473 BTRFS_I(inode)->generation = 0;
4474 cache->io_ctl.inode = NULL;
4475 iput(inode);
4476 }
4477 btrfs_put_block_group(cache);
4478}
4479
4480void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
4481 struct btrfs_fs_info *fs_info)
4482{
4483 struct btrfs_block_group_cache *cache;
4484
4485 spin_lock(&cur_trans->dirty_bgs_lock);
4486 while (!list_empty(&cur_trans->dirty_bgs)) {
4487 cache = list_first_entry(&cur_trans->dirty_bgs,
4488 struct btrfs_block_group_cache,
4489 dirty_list);
4490
4491 if (!list_empty(&cache->io_list)) {
4492 spin_unlock(&cur_trans->dirty_bgs_lock);
4493 list_del_init(&cache->io_list);
4494 btrfs_cleanup_bg_io(cache);
4495 spin_lock(&cur_trans->dirty_bgs_lock);
4496 }
4497
4498 list_del_init(&cache->dirty_list);
4499 spin_lock(&cache->lock);
4500 cache->disk_cache_state = BTRFS_DC_ERROR;
4501 spin_unlock(&cache->lock);
4502
4503 spin_unlock(&cur_trans->dirty_bgs_lock);
4504 btrfs_put_block_group(cache);
4505 btrfs_delayed_refs_rsv_release(fs_info, 1);
4506 spin_lock(&cur_trans->dirty_bgs_lock);
4507 }
4508 spin_unlock(&cur_trans->dirty_bgs_lock);
4509
4510
4511
4512
4513
4514 while (!list_empty(&cur_trans->io_bgs)) {
4515 cache = list_first_entry(&cur_trans->io_bgs,
4516 struct btrfs_block_group_cache,
4517 io_list);
4518
4519 list_del_init(&cache->io_list);
4520 spin_lock(&cache->lock);
4521 cache->disk_cache_state = BTRFS_DC_ERROR;
4522 spin_unlock(&cache->lock);
4523 btrfs_cleanup_bg_io(cache);
4524 }
4525}
4526
4527void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
4528 struct btrfs_fs_info *fs_info)
4529{
4530 struct btrfs_device *dev, *tmp;
4531
4532 btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
4533 ASSERT(list_empty(&cur_trans->dirty_bgs));
4534 ASSERT(list_empty(&cur_trans->io_bgs));
4535
4536 list_for_each_entry_safe(dev, tmp, &cur_trans->dev_update_list,
4537 post_commit_list) {
4538 list_del_init(&dev->post_commit_list);
4539 }
4540
4541 btrfs_destroy_delayed_refs(cur_trans, fs_info);
4542
4543 cur_trans->state = TRANS_STATE_COMMIT_START;
4544 wake_up(&fs_info->transaction_blocked_wait);
4545
4546 cur_trans->state = TRANS_STATE_UNBLOCKED;
4547 wake_up(&fs_info->transaction_wait);
4548
4549 btrfs_destroy_delayed_inodes(fs_info);
4550 btrfs_assert_delayed_root_empty(fs_info);
4551
4552 btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
4553 EXTENT_DIRTY);
4554 btrfs_destroy_pinned_extent(fs_info,
4555 fs_info->pinned_extents);
4556
4557 cur_trans->state =TRANS_STATE_COMPLETED;
4558 wake_up(&cur_trans->commit_wait);
4559}
4560
4561static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
4562{
4563 struct btrfs_transaction *t;
4564
4565 mutex_lock(&fs_info->transaction_kthread_mutex);
4566
4567 spin_lock(&fs_info->trans_lock);
4568 while (!list_empty(&fs_info->trans_list)) {
4569 t = list_first_entry(&fs_info->trans_list,
4570 struct btrfs_transaction, list);
4571 if (t->state >= TRANS_STATE_COMMIT_START) {
4572 refcount_inc(&t->use_count);
4573 spin_unlock(&fs_info->trans_lock);
4574 btrfs_wait_for_commit(fs_info, t->transid);
4575 btrfs_put_transaction(t);
4576 spin_lock(&fs_info->trans_lock);
4577 continue;
4578 }
4579 if (t == fs_info->running_transaction) {
4580 t->state = TRANS_STATE_COMMIT_DOING;
4581 spin_unlock(&fs_info->trans_lock);
4582
4583
4584
4585
4586 wait_event(t->writer_wait,
4587 atomic_read(&t->num_writers) == 0);
4588 } else {
4589 spin_unlock(&fs_info->trans_lock);
4590 }
4591 btrfs_cleanup_one_transaction(t, fs_info);
4592
4593 spin_lock(&fs_info->trans_lock);
4594 if (t == fs_info->running_transaction)
4595 fs_info->running_transaction = NULL;
4596 list_del_init(&t->list);
4597 spin_unlock(&fs_info->trans_lock);
4598
4599 btrfs_put_transaction(t);
4600 trace_btrfs_transaction_commit(fs_info->tree_root);
4601 spin_lock(&fs_info->trans_lock);
4602 }
4603 spin_unlock(&fs_info->trans_lock);
4604 btrfs_destroy_all_ordered_extents(fs_info);
4605 btrfs_destroy_delayed_inodes(fs_info);
4606 btrfs_assert_delayed_root_empty(fs_info);
4607 btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
4608 btrfs_destroy_all_delalloc_inodes(fs_info);
4609 mutex_unlock(&fs_info->transaction_kthread_mutex);
4610
4611 return 0;
4612}
4613
4614static const struct extent_io_ops btree_extent_io_ops = {
4615
4616 .submit_bio_hook = btree_submit_bio_hook,
4617 .readpage_end_io_hook = btree_readpage_end_io_hook,
4618};
4619