1
2
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4
5
6#include <linux/fs.h>
7#include <linux/blkdev.h>
8#include <linux/radix-tree.h>
9#include <linux/writeback.h>
10#include <linux/buffer_head.h>
11#include <linux/workqueue.h>
12#include <linux/kthread.h>
13#include <linux/slab.h>
14#include <linux/migrate.h>
15#include <linux/ratelimit.h>
16#include <linux/uuid.h>
17#include <linux/semaphore.h>
18#include <linux/error-injection.h>
19#include <linux/crc32c.h>
20#include <linux/sched/mm.h>
21#include <asm/unaligned.h>
22#include "ctree.h"
23#include "disk-io.h"
24#include "transaction.h"
25#include "btrfs_inode.h"
26#include "volumes.h"
27#include "print-tree.h"
28#include "locking.h"
29#include "tree-log.h"
30#include "free-space-cache.h"
31#include "free-space-tree.h"
32#include "inode-map.h"
33#include "check-integrity.h"
34#include "rcu-string.h"
35#include "dev-replace.h"
36#include "raid56.h"
37#include "sysfs.h"
38#include "qgroup.h"
39#include "compression.h"
40#include "tree-checker.h"
41#include "ref-verify.h"
42
43#ifdef CONFIG_X86
44#include <asm/cpufeature.h>
45#endif
46
47#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
48 BTRFS_HEADER_FLAG_RELOC |\
49 BTRFS_SUPER_FLAG_ERROR |\
50 BTRFS_SUPER_FLAG_SEEDING |\
51 BTRFS_SUPER_FLAG_METADUMP |\
52 BTRFS_SUPER_FLAG_METADUMP_V2)
53
54static const struct extent_io_ops btree_extent_io_ops;
55static void end_workqueue_fn(struct btrfs_work *work);
56static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
57static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
58 struct btrfs_fs_info *fs_info);
59static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
60static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
61 struct extent_io_tree *dirty_pages,
62 int mark);
63static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
64 struct extent_io_tree *pinned_extents);
65static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info);
66static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info);
67
68
69
70
71
72
73struct btrfs_end_io_wq {
74 struct bio *bio;
75 bio_end_io_t *end_io;
76 void *private;
77 struct btrfs_fs_info *info;
78 blk_status_t status;
79 enum btrfs_wq_endio_type metadata;
80 struct btrfs_work work;
81};
82
83static struct kmem_cache *btrfs_end_io_wq_cache;
84
85int __init btrfs_end_io_wq_init(void)
86{
87 btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq",
88 sizeof(struct btrfs_end_io_wq),
89 0,
90 SLAB_MEM_SPREAD,
91 NULL);
92 if (!btrfs_end_io_wq_cache)
93 return -ENOMEM;
94 return 0;
95}
96
97void __cold btrfs_end_io_wq_exit(void)
98{
99 kmem_cache_destroy(btrfs_end_io_wq_cache);
100}
101
102
103
104
105
106
107struct async_submit_bio {
108 void *private_data;
109 struct bio *bio;
110 extent_submit_bio_start_t *submit_bio_start;
111 int mirror_num;
112
113
114
115
116 u64 bio_offset;
117 struct btrfs_work work;
118 blk_status_t status;
119};
120
121
122
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124
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141
142
143
144#ifdef CONFIG_DEBUG_LOCK_ALLOC
145# if BTRFS_MAX_LEVEL != 8
146# error
147# endif
148
149static struct btrfs_lockdep_keyset {
150 u64 id;
151 const char *name_stem;
152 char names[BTRFS_MAX_LEVEL + 1][20];
153 struct lock_class_key keys[BTRFS_MAX_LEVEL + 1];
154} btrfs_lockdep_keysets[] = {
155 { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" },
156 { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" },
157 { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" },
158 { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" },
159 { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" },
160 { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" },
161 { .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" },
162 { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" },
163 { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" },
164 { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" },
165 { .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" },
166 { .id = BTRFS_FREE_SPACE_TREE_OBJECTID, .name_stem = "free-space" },
167 { .id = 0, .name_stem = "tree" },
168};
169
170void __init btrfs_init_lockdep(void)
171{
172 int i, j;
173
174
175 for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) {
176 struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i];
177
178 for (j = 0; j < ARRAY_SIZE(ks->names); j++)
179 snprintf(ks->names[j], sizeof(ks->names[j]),
180 "btrfs-%s-%02d", ks->name_stem, j);
181 }
182}
183
184void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
185 int level)
186{
187 struct btrfs_lockdep_keyset *ks;
188
189 BUG_ON(level >= ARRAY_SIZE(ks->keys));
190
191
192 for (ks = btrfs_lockdep_keysets; ks->id; ks++)
193 if (ks->id == objectid)
194 break;
195
196 lockdep_set_class_and_name(&eb->lock,
197 &ks->keys[level], ks->names[level]);
198}
199
200#endif
201
202
203
204
205
206struct extent_map *btree_get_extent(struct btrfs_inode *inode,
207 struct page *page, size_t pg_offset, u64 start, u64 len,
208 int create)
209{
210 struct btrfs_fs_info *fs_info = inode->root->fs_info;
211 struct extent_map_tree *em_tree = &inode->extent_tree;
212 struct extent_map *em;
213 int ret;
214
215 read_lock(&em_tree->lock);
216 em = lookup_extent_mapping(em_tree, start, len);
217 if (em) {
218 em->bdev = fs_info->fs_devices->latest_bdev;
219 read_unlock(&em_tree->lock);
220 goto out;
221 }
222 read_unlock(&em_tree->lock);
223
224 em = alloc_extent_map();
225 if (!em) {
226 em = ERR_PTR(-ENOMEM);
227 goto out;
228 }
229 em->start = 0;
230 em->len = (u64)-1;
231 em->block_len = (u64)-1;
232 em->block_start = 0;
233 em->bdev = fs_info->fs_devices->latest_bdev;
234
235 write_lock(&em_tree->lock);
236 ret = add_extent_mapping(em_tree, em, 0);
237 if (ret == -EEXIST) {
238 free_extent_map(em);
239 em = lookup_extent_mapping(em_tree, start, len);
240 if (!em)
241 em = ERR_PTR(-EIO);
242 } else if (ret) {
243 free_extent_map(em);
244 em = ERR_PTR(ret);
245 }
246 write_unlock(&em_tree->lock);
247
248out:
249 return em;
250}
251
252u32 btrfs_csum_data(const char *data, u32 seed, size_t len)
253{
254 return crc32c(seed, data, len);
255}
256
257void btrfs_csum_final(u32 crc, u8 *result)
258{
259 put_unaligned_le32(~crc, result);
260}
261
262
263
264
265
266
267static int csum_tree_block(struct extent_buffer *buf, u8 *result)
268{
269 unsigned long len;
270 unsigned long cur_len;
271 unsigned long offset = BTRFS_CSUM_SIZE;
272 char *kaddr;
273 unsigned long map_start;
274 unsigned long map_len;
275 int err;
276 u32 crc = ~(u32)0;
277
278 len = buf->len - offset;
279 while (len > 0) {
280
281
282
283
284
285
286 err = map_private_extent_buffer(buf, offset, 32,
287 &kaddr, &map_start, &map_len);
288 if (WARN_ON(err))
289 return err;
290 cur_len = min(len, map_len - (offset - map_start));
291 crc = btrfs_csum_data(kaddr + offset - map_start,
292 crc, cur_len);
293 len -= cur_len;
294 offset += cur_len;
295 }
296 memset(result, 0, BTRFS_CSUM_SIZE);
297
298 btrfs_csum_final(crc, result);
299
300 return 0;
301}
302
303
304
305
306
307
308
309static int verify_parent_transid(struct extent_io_tree *io_tree,
310 struct extent_buffer *eb, u64 parent_transid,
311 int atomic)
312{
313 struct extent_state *cached_state = NULL;
314 int ret;
315 bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB);
316
317 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
318 return 0;
319
320 if (atomic)
321 return -EAGAIN;
322
323 if (need_lock) {
324 btrfs_tree_read_lock(eb);
325 btrfs_set_lock_blocking_read(eb);
326 }
327
328 lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
329 &cached_state);
330 if (extent_buffer_uptodate(eb) &&
331 btrfs_header_generation(eb) == parent_transid) {
332 ret = 0;
333 goto out;
334 }
335 btrfs_err_rl(eb->fs_info,
336 "parent transid verify failed on %llu wanted %llu found %llu",
337 eb->start,
338 parent_transid, btrfs_header_generation(eb));
339 ret = 1;
340
341
342
343
344
345
346
347
348
349 if (!extent_buffer_under_io(eb))
350 clear_extent_buffer_uptodate(eb);
351out:
352 unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
353 &cached_state);
354 if (need_lock)
355 btrfs_tree_read_unlock_blocking(eb);
356 return ret;
357}
358
359
360
361
362
363static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
364 char *raw_disk_sb)
365{
366 struct btrfs_super_block *disk_sb =
367 (struct btrfs_super_block *)raw_disk_sb;
368 u16 csum_type = btrfs_super_csum_type(disk_sb);
369 int ret = 0;
370
371 if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
372 u32 crc = ~(u32)0;
373 char result[sizeof(crc)];
374
375
376
377
378
379
380 crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE,
381 crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
382 btrfs_csum_final(crc, result);
383
384 if (memcmp(raw_disk_sb, result, sizeof(result)))
385 ret = 1;
386 }
387
388 if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
389 btrfs_err(fs_info, "unsupported checksum algorithm %u",
390 csum_type);
391 ret = 1;
392 }
393
394 return ret;
395}
396
397int btrfs_verify_level_key(struct extent_buffer *eb, int level,
398 struct btrfs_key *first_key, u64 parent_transid)
399{
400 struct btrfs_fs_info *fs_info = eb->fs_info;
401 int found_level;
402 struct btrfs_key found_key;
403 int ret;
404
405 found_level = btrfs_header_level(eb);
406 if (found_level != level) {
407 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
408 KERN_ERR "BTRFS: tree level check failed\n");
409 btrfs_err(fs_info,
410"tree level mismatch detected, bytenr=%llu level expected=%u has=%u",
411 eb->start, level, found_level);
412 return -EIO;
413 }
414
415 if (!first_key)
416 return 0;
417
418
419
420
421
422
423
424 if (btrfs_header_generation(eb) > fs_info->last_trans_committed)
425 return 0;
426 if (found_level)
427 btrfs_node_key_to_cpu(eb, &found_key, 0);
428 else
429 btrfs_item_key_to_cpu(eb, &found_key, 0);
430 ret = btrfs_comp_cpu_keys(first_key, &found_key);
431
432 if (ret) {
433 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
434 KERN_ERR "BTRFS: tree first key check failed\n");
435 btrfs_err(fs_info,
436"tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
437 eb->start, parent_transid, first_key->objectid,
438 first_key->type, first_key->offset,
439 found_key.objectid, found_key.type,
440 found_key.offset);
441 }
442 return ret;
443}
444
445
446
447
448
449
450
451
452
453static int btree_read_extent_buffer_pages(struct extent_buffer *eb,
454 u64 parent_transid, int level,
455 struct btrfs_key *first_key)
456{
457 struct btrfs_fs_info *fs_info = eb->fs_info;
458 struct extent_io_tree *io_tree;
459 int failed = 0;
460 int ret;
461 int num_copies = 0;
462 int mirror_num = 0;
463 int failed_mirror = 0;
464
465 io_tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
466 while (1) {
467 clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
468 ret = read_extent_buffer_pages(eb, WAIT_COMPLETE, mirror_num);
469 if (!ret) {
470 if (verify_parent_transid(io_tree, eb,
471 parent_transid, 0))
472 ret = -EIO;
473 else if (btrfs_verify_level_key(eb, level,
474 first_key, parent_transid))
475 ret = -EUCLEAN;
476 else
477 break;
478 }
479
480 num_copies = btrfs_num_copies(fs_info,
481 eb->start, eb->len);
482 if (num_copies == 1)
483 break;
484
485 if (!failed_mirror) {
486 failed = 1;
487 failed_mirror = eb->read_mirror;
488 }
489
490 mirror_num++;
491 if (mirror_num == failed_mirror)
492 mirror_num++;
493
494 if (mirror_num > num_copies)
495 break;
496 }
497
498 if (failed && !ret && failed_mirror)
499 btrfs_repair_eb_io_failure(eb, failed_mirror);
500
501 return ret;
502}
503
504
505
506
507
508
509static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
510{
511 u64 start = page_offset(page);
512 u64 found_start;
513 u8 result[BTRFS_CSUM_SIZE];
514 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
515 struct extent_buffer *eb;
516 int ret;
517
518 eb = (struct extent_buffer *)page->private;
519 if (page != eb->pages[0])
520 return 0;
521
522 found_start = btrfs_header_bytenr(eb);
523
524
525
526
527 if (WARN_ON(found_start != start))
528 return -EUCLEAN;
529 if (WARN_ON(!PageUptodate(page)))
530 return -EUCLEAN;
531
532 ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
533 btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0);
534
535 if (csum_tree_block(eb, result))
536 return -EINVAL;
537
538 if (btrfs_header_level(eb))
539 ret = btrfs_check_node(eb);
540 else
541 ret = btrfs_check_leaf_full(eb);
542
543 if (ret < 0) {
544 btrfs_err(fs_info,
545 "block=%llu write time tree block corruption detected",
546 eb->start);
547 return ret;
548 }
549 write_extent_buffer(eb, result, 0, csum_size);
550
551 return 0;
552}
553
554static int check_tree_block_fsid(struct extent_buffer *eb)
555{
556 struct btrfs_fs_info *fs_info = eb->fs_info;
557 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
558 u8 fsid[BTRFS_FSID_SIZE];
559 int ret = 1;
560
561 read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
562 while (fs_devices) {
563 u8 *metadata_uuid;
564
565
566
567
568
569
570 if (fs_devices == fs_info->fs_devices &&
571 btrfs_fs_incompat(fs_info, METADATA_UUID))
572 metadata_uuid = fs_devices->metadata_uuid;
573 else
574 metadata_uuid = fs_devices->fsid;
575
576 if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE)) {
577 ret = 0;
578 break;
579 }
580 fs_devices = fs_devices->seed;
581 }
582 return ret;
583}
584
585static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
586 u64 phy_offset, struct page *page,
587 u64 start, u64 end, int mirror)
588{
589 u64 found_start;
590 int found_level;
591 struct extent_buffer *eb;
592 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
593 struct btrfs_fs_info *fs_info = root->fs_info;
594 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
595 int ret = 0;
596 u8 result[BTRFS_CSUM_SIZE];
597 int reads_done;
598
599 if (!page->private)
600 goto out;
601
602 eb = (struct extent_buffer *)page->private;
603
604
605
606
607 extent_buffer_get(eb);
608
609 reads_done = atomic_dec_and_test(&eb->io_pages);
610 if (!reads_done)
611 goto err;
612
613 eb->read_mirror = mirror;
614 if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
615 ret = -EIO;
616 goto err;
617 }
618
619 found_start = btrfs_header_bytenr(eb);
620 if (found_start != eb->start) {
621 btrfs_err_rl(fs_info, "bad tree block start, want %llu have %llu",
622 eb->start, found_start);
623 ret = -EIO;
624 goto err;
625 }
626 if (check_tree_block_fsid(eb)) {
627 btrfs_err_rl(fs_info, "bad fsid on block %llu",
628 eb->start);
629 ret = -EIO;
630 goto err;
631 }
632 found_level = btrfs_header_level(eb);
633 if (found_level >= BTRFS_MAX_LEVEL) {
634 btrfs_err(fs_info, "bad tree block level %d on %llu",
635 (int)btrfs_header_level(eb), eb->start);
636 ret = -EIO;
637 goto err;
638 }
639
640 btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
641 eb, found_level);
642
643 ret = csum_tree_block(eb, result);
644 if (ret)
645 goto err;
646
647 if (memcmp_extent_buffer(eb, result, 0, csum_size)) {
648 u32 val;
649 u32 found = 0;
650
651 memcpy(&found, result, csum_size);
652
653 read_extent_buffer(eb, &val, 0, csum_size);
654 btrfs_warn_rl(fs_info,
655 "%s checksum verify failed on %llu wanted %x found %x level %d",
656 fs_info->sb->s_id, eb->start,
657 val, found, btrfs_header_level(eb));
658 ret = -EUCLEAN;
659 goto err;
660 }
661
662
663
664
665
666
667 if (found_level == 0 && btrfs_check_leaf_full(eb)) {
668 set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
669 ret = -EIO;
670 }
671
672 if (found_level > 0 && btrfs_check_node(eb))
673 ret = -EIO;
674
675 if (!ret)
676 set_extent_buffer_uptodate(eb);
677 else
678 btrfs_err(fs_info,
679 "block=%llu read time tree block corruption detected",
680 eb->start);
681err:
682 if (reads_done &&
683 test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
684 btree_readahead_hook(eb, ret);
685
686 if (ret) {
687
688
689
690
691
692 atomic_inc(&eb->io_pages);
693 clear_extent_buffer_uptodate(eb);
694 }
695 free_extent_buffer(eb);
696out:
697 return ret;
698}
699
700static void end_workqueue_bio(struct bio *bio)
701{
702 struct btrfs_end_io_wq *end_io_wq = bio->bi_private;
703 struct btrfs_fs_info *fs_info;
704 struct btrfs_workqueue *wq;
705 btrfs_work_func_t func;
706
707 fs_info = end_io_wq->info;
708 end_io_wq->status = bio->bi_status;
709
710 if (bio_op(bio) == REQ_OP_WRITE) {
711 if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) {
712 wq = fs_info->endio_meta_write_workers;
713 func = btrfs_endio_meta_write_helper;
714 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) {
715 wq = fs_info->endio_freespace_worker;
716 func = btrfs_freespace_write_helper;
717 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
718 wq = fs_info->endio_raid56_workers;
719 func = btrfs_endio_raid56_helper;
720 } else {
721 wq = fs_info->endio_write_workers;
722 func = btrfs_endio_write_helper;
723 }
724 } else {
725 if (unlikely(end_io_wq->metadata ==
726 BTRFS_WQ_ENDIO_DIO_REPAIR)) {
727 wq = fs_info->endio_repair_workers;
728 func = btrfs_endio_repair_helper;
729 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
730 wq = fs_info->endio_raid56_workers;
731 func = btrfs_endio_raid56_helper;
732 } else if (end_io_wq->metadata) {
733 wq = fs_info->endio_meta_workers;
734 func = btrfs_endio_meta_helper;
735 } else {
736 wq = fs_info->endio_workers;
737 func = btrfs_endio_helper;
738 }
739 }
740
741 btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL);
742 btrfs_queue_work(wq, &end_io_wq->work);
743}
744
745blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
746 enum btrfs_wq_endio_type metadata)
747{
748 struct btrfs_end_io_wq *end_io_wq;
749
750 end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS);
751 if (!end_io_wq)
752 return BLK_STS_RESOURCE;
753
754 end_io_wq->private = bio->bi_private;
755 end_io_wq->end_io = bio->bi_end_io;
756 end_io_wq->info = info;
757 end_io_wq->status = 0;
758 end_io_wq->bio = bio;
759 end_io_wq->metadata = metadata;
760
761 bio->bi_private = end_io_wq;
762 bio->bi_end_io = end_workqueue_bio;
763 return 0;
764}
765
766static void run_one_async_start(struct btrfs_work *work)
767{
768 struct async_submit_bio *async;
769 blk_status_t ret;
770
771 async = container_of(work, struct async_submit_bio, work);
772 ret = async->submit_bio_start(async->private_data, async->bio,
773 async->bio_offset);
774 if (ret)
775 async->status = ret;
776}
777
778
779
780
781
782
783
784
785
786static void run_one_async_done(struct btrfs_work *work)
787{
788 struct async_submit_bio *async;
789 struct inode *inode;
790 blk_status_t ret;
791
792 async = container_of(work, struct async_submit_bio, work);
793 inode = async->private_data;
794
795
796 if (async->status) {
797 async->bio->bi_status = async->status;
798 bio_endio(async->bio);
799 return;
800 }
801
802 ret = btrfs_map_bio(btrfs_sb(inode->i_sb), async->bio,
803 async->mirror_num, 1);
804 if (ret) {
805 async->bio->bi_status = ret;
806 bio_endio(async->bio);
807 }
808}
809
810static void run_one_async_free(struct btrfs_work *work)
811{
812 struct async_submit_bio *async;
813
814 async = container_of(work, struct async_submit_bio, work);
815 kfree(async);
816}
817
818blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
819 int mirror_num, unsigned long bio_flags,
820 u64 bio_offset, void *private_data,
821 extent_submit_bio_start_t *submit_bio_start)
822{
823 struct async_submit_bio *async;
824
825 async = kmalloc(sizeof(*async), GFP_NOFS);
826 if (!async)
827 return BLK_STS_RESOURCE;
828
829 async->private_data = private_data;
830 async->bio = bio;
831 async->mirror_num = mirror_num;
832 async->submit_bio_start = submit_bio_start;
833
834 btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start,
835 run_one_async_done, run_one_async_free);
836
837 async->bio_offset = bio_offset;
838
839 async->status = 0;
840
841 if (op_is_sync(bio->bi_opf))
842 btrfs_set_work_high_priority(&async->work);
843
844 btrfs_queue_work(fs_info->workers, &async->work);
845 return 0;
846}
847
848static blk_status_t btree_csum_one_bio(struct bio *bio)
849{
850 struct bio_vec *bvec;
851 struct btrfs_root *root;
852 int ret = 0;
853 struct bvec_iter_all iter_all;
854
855 ASSERT(!bio_flagged(bio, BIO_CLONED));
856 bio_for_each_segment_all(bvec, bio, iter_all) {
857 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
858 ret = csum_dirty_buffer(root->fs_info, bvec->bv_page);
859 if (ret)
860 break;
861 }
862
863 return errno_to_blk_status(ret);
864}
865
866static blk_status_t btree_submit_bio_start(void *private_data, struct bio *bio,
867 u64 bio_offset)
868{
869
870
871
872
873 return btree_csum_one_bio(bio);
874}
875
876static int check_async_write(struct btrfs_inode *bi)
877{
878 if (atomic_read(&bi->sync_writers))
879 return 0;
880#ifdef CONFIG_X86
881 if (static_cpu_has(X86_FEATURE_XMM4_2))
882 return 0;
883#endif
884 return 1;
885}
886
887static blk_status_t btree_submit_bio_hook(struct inode *inode, struct bio *bio,
888 int mirror_num,
889 unsigned long bio_flags)
890{
891 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
892 int async = check_async_write(BTRFS_I(inode));
893 blk_status_t ret;
894
895 if (bio_op(bio) != REQ_OP_WRITE) {
896
897
898
899
900 ret = btrfs_bio_wq_end_io(fs_info, bio,
901 BTRFS_WQ_ENDIO_METADATA);
902 if (ret)
903 goto out_w_error;
904 ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
905 } else if (!async) {
906 ret = btree_csum_one_bio(bio);
907 if (ret)
908 goto out_w_error;
909 ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
910 } else {
911
912
913
914
915 ret = btrfs_wq_submit_bio(fs_info, bio, mirror_num, 0,
916 0, inode, btree_submit_bio_start);
917 }
918
919 if (ret)
920 goto out_w_error;
921 return 0;
922
923out_w_error:
924 bio->bi_status = ret;
925 bio_endio(bio);
926 return ret;
927}
928
929#ifdef CONFIG_MIGRATION
930static int btree_migratepage(struct address_space *mapping,
931 struct page *newpage, struct page *page,
932 enum migrate_mode mode)
933{
934
935
936
937
938 if (PageDirty(page))
939 return -EAGAIN;
940
941
942
943
944 if (page_has_private(page) &&
945 !try_to_release_page(page, GFP_KERNEL))
946 return -EAGAIN;
947 return migrate_page(mapping, newpage, page, mode);
948}
949#endif
950
951
952static int btree_writepages(struct address_space *mapping,
953 struct writeback_control *wbc)
954{
955 struct btrfs_fs_info *fs_info;
956 int ret;
957
958 if (wbc->sync_mode == WB_SYNC_NONE) {
959
960 if (wbc->for_kupdate)
961 return 0;
962
963 fs_info = BTRFS_I(mapping->host)->root->fs_info;
964
965 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
966 BTRFS_DIRTY_METADATA_THRESH,
967 fs_info->dirty_metadata_batch);
968 if (ret < 0)
969 return 0;
970 }
971 return btree_write_cache_pages(mapping, wbc);
972}
973
974static int btree_readpage(struct file *file, struct page *page)
975{
976 struct extent_io_tree *tree;
977 tree = &BTRFS_I(page->mapping->host)->io_tree;
978 return extent_read_full_page(tree, page, btree_get_extent, 0);
979}
980
981static int btree_releasepage(struct page *page, gfp_t gfp_flags)
982{
983 if (PageWriteback(page) || PageDirty(page))
984 return 0;
985
986 return try_release_extent_buffer(page);
987}
988
989static void btree_invalidatepage(struct page *page, unsigned int offset,
990 unsigned int length)
991{
992 struct extent_io_tree *tree;
993 tree = &BTRFS_I(page->mapping->host)->io_tree;
994 extent_invalidatepage(tree, page, offset);
995 btree_releasepage(page, GFP_NOFS);
996 if (PagePrivate(page)) {
997 btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info,
998 "page private not zero on page %llu",
999 (unsigned long long)page_offset(page));
1000 ClearPagePrivate(page);
1001 set_page_private(page, 0);
1002 put_page(page);
1003 }
1004}
1005
1006static int btree_set_page_dirty(struct page *page)
1007{
1008#ifdef DEBUG
1009 struct extent_buffer *eb;
1010
1011 BUG_ON(!PagePrivate(page));
1012 eb = (struct extent_buffer *)page->private;
1013 BUG_ON(!eb);
1014 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
1015 BUG_ON(!atomic_read(&eb->refs));
1016 btrfs_assert_tree_locked(eb);
1017#endif
1018 return __set_page_dirty_nobuffers(page);
1019}
1020
1021static const struct address_space_operations btree_aops = {
1022 .readpage = btree_readpage,
1023 .writepages = btree_writepages,
1024 .releasepage = btree_releasepage,
1025 .invalidatepage = btree_invalidatepage,
1026#ifdef CONFIG_MIGRATION
1027 .migratepage = btree_migratepage,
1028#endif
1029 .set_page_dirty = btree_set_page_dirty,
1030};
1031
1032void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr)
1033{
1034 struct extent_buffer *buf = NULL;
1035 int ret;
1036
1037 buf = btrfs_find_create_tree_block(fs_info, bytenr);
1038 if (IS_ERR(buf))
1039 return;
1040
1041 ret = read_extent_buffer_pages(buf, WAIT_NONE, 0);
1042 if (ret < 0)
1043 free_extent_buffer_stale(buf);
1044 else
1045 free_extent_buffer(buf);
1046}
1047
1048int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr,
1049 int mirror_num, struct extent_buffer **eb)
1050{
1051 struct extent_buffer *buf = NULL;
1052 int ret;
1053
1054 buf = btrfs_find_create_tree_block(fs_info, bytenr);
1055 if (IS_ERR(buf))
1056 return 0;
1057
1058 set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags);
1059
1060 ret = read_extent_buffer_pages(buf, WAIT_PAGE_LOCK, mirror_num);
1061 if (ret) {
1062 free_extent_buffer_stale(buf);
1063 return ret;
1064 }
1065
1066 if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) {
1067 free_extent_buffer_stale(buf);
1068 return -EIO;
1069 } else if (extent_buffer_uptodate(buf)) {
1070 *eb = buf;
1071 } else {
1072 free_extent_buffer(buf);
1073 }
1074 return 0;
1075}
1076
1077struct extent_buffer *btrfs_find_create_tree_block(
1078 struct btrfs_fs_info *fs_info,
1079 u64 bytenr)
1080{
1081 if (btrfs_is_testing(fs_info))
1082 return alloc_test_extent_buffer(fs_info, bytenr);
1083 return alloc_extent_buffer(fs_info, bytenr);
1084}
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
1095 u64 parent_transid, int level,
1096 struct btrfs_key *first_key)
1097{
1098 struct extent_buffer *buf = NULL;
1099 int ret;
1100
1101 buf = btrfs_find_create_tree_block(fs_info, bytenr);
1102 if (IS_ERR(buf))
1103 return buf;
1104
1105 ret = btree_read_extent_buffer_pages(buf, parent_transid,
1106 level, first_key);
1107 if (ret) {
1108 free_extent_buffer_stale(buf);
1109 return ERR_PTR(ret);
1110 }
1111 return buf;
1112
1113}
1114
1115void btrfs_clean_tree_block(struct extent_buffer *buf)
1116{
1117 struct btrfs_fs_info *fs_info = buf->fs_info;
1118 if (btrfs_header_generation(buf) ==
1119 fs_info->running_transaction->transid) {
1120 btrfs_assert_tree_locked(buf);
1121
1122 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
1123 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
1124 -buf->len,
1125 fs_info->dirty_metadata_batch);
1126
1127 btrfs_set_lock_blocking_write(buf);
1128 clear_extent_buffer_dirty(buf);
1129 }
1130 }
1131}
1132
1133static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void)
1134{
1135 struct btrfs_subvolume_writers *writers;
1136 int ret;
1137
1138 writers = kmalloc(sizeof(*writers), GFP_NOFS);
1139 if (!writers)
1140 return ERR_PTR(-ENOMEM);
1141
1142 ret = percpu_counter_init(&writers->counter, 0, GFP_NOFS);
1143 if (ret < 0) {
1144 kfree(writers);
1145 return ERR_PTR(ret);
1146 }
1147
1148 init_waitqueue_head(&writers->wait);
1149 return writers;
1150}
1151
1152static void
1153btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers)
1154{
1155 percpu_counter_destroy(&writers->counter);
1156 kfree(writers);
1157}
1158
1159static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
1160 u64 objectid)
1161{
1162 bool dummy = test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
1163 root->node = NULL;
1164 root->commit_root = NULL;
1165 root->state = 0;
1166 root->orphan_cleanup_state = 0;
1167
1168 root->last_trans = 0;
1169 root->highest_objectid = 0;
1170 root->nr_delalloc_inodes = 0;
1171 root->nr_ordered_extents = 0;
1172 root->inode_tree = RB_ROOT;
1173 INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
1174 root->block_rsv = NULL;
1175
1176 INIT_LIST_HEAD(&root->dirty_list);
1177 INIT_LIST_HEAD(&root->root_list);
1178 INIT_LIST_HEAD(&root->delalloc_inodes);
1179 INIT_LIST_HEAD(&root->delalloc_root);
1180 INIT_LIST_HEAD(&root->ordered_extents);
1181 INIT_LIST_HEAD(&root->ordered_root);
1182 INIT_LIST_HEAD(&root->reloc_dirty_list);
1183 INIT_LIST_HEAD(&root->logged_list[0]);
1184 INIT_LIST_HEAD(&root->logged_list[1]);
1185 spin_lock_init(&root->inode_lock);
1186 spin_lock_init(&root->delalloc_lock);
1187 spin_lock_init(&root->ordered_extent_lock);
1188 spin_lock_init(&root->accounting_lock);
1189 spin_lock_init(&root->log_extents_lock[0]);
1190 spin_lock_init(&root->log_extents_lock[1]);
1191 spin_lock_init(&root->qgroup_meta_rsv_lock);
1192 mutex_init(&root->objectid_mutex);
1193 mutex_init(&root->log_mutex);
1194 mutex_init(&root->ordered_extent_mutex);
1195 mutex_init(&root->delalloc_mutex);
1196 init_waitqueue_head(&root->log_writer_wait);
1197 init_waitqueue_head(&root->log_commit_wait[0]);
1198 init_waitqueue_head(&root->log_commit_wait[1]);
1199 INIT_LIST_HEAD(&root->log_ctxs[0]);
1200 INIT_LIST_HEAD(&root->log_ctxs[1]);
1201 atomic_set(&root->log_commit[0], 0);
1202 atomic_set(&root->log_commit[1], 0);
1203 atomic_set(&root->log_writers, 0);
1204 atomic_set(&root->log_batch, 0);
1205 refcount_set(&root->refs, 1);
1206 atomic_set(&root->will_be_snapshotted, 0);
1207 atomic_set(&root->snapshot_force_cow, 0);
1208 atomic_set(&root->nr_swapfiles, 0);
1209 root->log_transid = 0;
1210 root->log_transid_committed = -1;
1211 root->last_log_commit = 0;
1212 if (!dummy)
1213 extent_io_tree_init(fs_info, &root->dirty_log_pages,
1214 IO_TREE_ROOT_DIRTY_LOG_PAGES, NULL);
1215
1216 memset(&root->root_key, 0, sizeof(root->root_key));
1217 memset(&root->root_item, 0, sizeof(root->root_item));
1218 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
1219 if (!dummy)
1220 root->defrag_trans_start = fs_info->generation;
1221 else
1222 root->defrag_trans_start = 0;
1223 root->root_key.objectid = objectid;
1224 root->anon_dev = 0;
1225
1226 spin_lock_init(&root->root_item_lock);
1227 btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks);
1228}
1229
1230static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
1231 gfp_t flags)
1232{
1233 struct btrfs_root *root = kzalloc(sizeof(*root), flags);
1234 if (root)
1235 root->fs_info = fs_info;
1236 return root;
1237}
1238
1239#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1240
1241struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info)
1242{
1243 struct btrfs_root *root;
1244
1245 if (!fs_info)
1246 return ERR_PTR(-EINVAL);
1247
1248 root = btrfs_alloc_root(fs_info, GFP_KERNEL);
1249 if (!root)
1250 return ERR_PTR(-ENOMEM);
1251
1252
1253 __setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
1254 root->alloc_bytenr = 0;
1255
1256 return root;
1257}
1258#endif
1259
1260struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
1261 u64 objectid)
1262{
1263 struct btrfs_fs_info *fs_info = trans->fs_info;
1264 struct extent_buffer *leaf;
1265 struct btrfs_root *tree_root = fs_info->tree_root;
1266 struct btrfs_root *root;
1267 struct btrfs_key key;
1268 unsigned int nofs_flag;
1269 int ret = 0;
1270 uuid_le uuid = NULL_UUID_LE;
1271
1272
1273
1274
1275
1276 nofs_flag = memalloc_nofs_save();
1277 root = btrfs_alloc_root(fs_info, GFP_KERNEL);
1278 memalloc_nofs_restore(nofs_flag);
1279 if (!root)
1280 return ERR_PTR(-ENOMEM);
1281
1282 __setup_root(root, fs_info, objectid);
1283 root->root_key.objectid = objectid;
1284 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1285 root->root_key.offset = 0;
1286
1287 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
1288 if (IS_ERR(leaf)) {
1289 ret = PTR_ERR(leaf);
1290 leaf = NULL;
1291 goto fail;
1292 }
1293
1294 root->node = leaf;
1295 btrfs_mark_buffer_dirty(leaf);
1296
1297 root->commit_root = btrfs_root_node(root);
1298 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
1299
1300 root->root_item.flags = 0;
1301 root->root_item.byte_limit = 0;
1302 btrfs_set_root_bytenr(&root->root_item, leaf->start);
1303 btrfs_set_root_generation(&root->root_item, trans->transid);
1304 btrfs_set_root_level(&root->root_item, 0);
1305 btrfs_set_root_refs(&root->root_item, 1);
1306 btrfs_set_root_used(&root->root_item, leaf->len);
1307 btrfs_set_root_last_snapshot(&root->root_item, 0);
1308 btrfs_set_root_dirid(&root->root_item, 0);
1309 if (is_fstree(objectid))
1310 uuid_le_gen(&uuid);
1311 memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
1312 root->root_item.drop_level = 0;
1313
1314 key.objectid = objectid;
1315 key.type = BTRFS_ROOT_ITEM_KEY;
1316 key.offset = 0;
1317 ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
1318 if (ret)
1319 goto fail;
1320
1321 btrfs_tree_unlock(leaf);
1322
1323 return root;
1324
1325fail:
1326 if (leaf) {
1327 btrfs_tree_unlock(leaf);
1328 free_extent_buffer(root->commit_root);
1329 free_extent_buffer(leaf);
1330 }
1331 kfree(root);
1332
1333 return ERR_PTR(ret);
1334}
1335
1336static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1337 struct btrfs_fs_info *fs_info)
1338{
1339 struct btrfs_root *root;
1340 struct extent_buffer *leaf;
1341
1342 root = btrfs_alloc_root(fs_info, GFP_NOFS);
1343 if (!root)
1344 return ERR_PTR(-ENOMEM);
1345
1346 __setup_root(root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1347
1348 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1349 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1350 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361 leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
1362 NULL, 0, 0, 0);
1363 if (IS_ERR(leaf)) {
1364 kfree(root);
1365 return ERR_CAST(leaf);
1366 }
1367
1368 root->node = leaf;
1369
1370 btrfs_mark_buffer_dirty(root->node);
1371 btrfs_tree_unlock(root->node);
1372 return root;
1373}
1374
1375int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1376 struct btrfs_fs_info *fs_info)
1377{
1378 struct btrfs_root *log_root;
1379
1380 log_root = alloc_log_tree(trans, fs_info);
1381 if (IS_ERR(log_root))
1382 return PTR_ERR(log_root);
1383 WARN_ON(fs_info->log_root_tree);
1384 fs_info->log_root_tree = log_root;
1385 return 0;
1386}
1387
1388int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1389 struct btrfs_root *root)
1390{
1391 struct btrfs_fs_info *fs_info = root->fs_info;
1392 struct btrfs_root *log_root;
1393 struct btrfs_inode_item *inode_item;
1394
1395 log_root = alloc_log_tree(trans, fs_info);
1396 if (IS_ERR(log_root))
1397 return PTR_ERR(log_root);
1398
1399 log_root->last_trans = trans->transid;
1400 log_root->root_key.offset = root->root_key.objectid;
1401
1402 inode_item = &log_root->root_item.inode;
1403 btrfs_set_stack_inode_generation(inode_item, 1);
1404 btrfs_set_stack_inode_size(inode_item, 3);
1405 btrfs_set_stack_inode_nlink(inode_item, 1);
1406 btrfs_set_stack_inode_nbytes(inode_item,
1407 fs_info->nodesize);
1408 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
1409
1410 btrfs_set_root_node(&log_root->root_item, log_root->node);
1411
1412 WARN_ON(root->log_root);
1413 root->log_root = log_root;
1414 root->log_transid = 0;
1415 root->log_transid_committed = -1;
1416 root->last_log_commit = 0;
1417 return 0;
1418}
1419
1420static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
1421 struct btrfs_key *key)
1422{
1423 struct btrfs_root *root;
1424 struct btrfs_fs_info *fs_info = tree_root->fs_info;
1425 struct btrfs_path *path;
1426 u64 generation;
1427 int ret;
1428 int level;
1429
1430 path = btrfs_alloc_path();
1431 if (!path)
1432 return ERR_PTR(-ENOMEM);
1433
1434 root = btrfs_alloc_root(fs_info, GFP_NOFS);
1435 if (!root) {
1436 ret = -ENOMEM;
1437 goto alloc_fail;
1438 }
1439
1440 __setup_root(root, fs_info, key->objectid);
1441
1442 ret = btrfs_find_root(tree_root, key, path,
1443 &root->root_item, &root->root_key);
1444 if (ret) {
1445 if (ret > 0)
1446 ret = -ENOENT;
1447 goto find_fail;
1448 }
1449
1450 generation = btrfs_root_generation(&root->root_item);
1451 level = btrfs_root_level(&root->root_item);
1452 root->node = read_tree_block(fs_info,
1453 btrfs_root_bytenr(&root->root_item),
1454 generation, level, NULL);
1455 if (IS_ERR(root->node)) {
1456 ret = PTR_ERR(root->node);
1457 goto find_fail;
1458 } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
1459 ret = -EIO;
1460 free_extent_buffer(root->node);
1461 goto find_fail;
1462 }
1463 root->commit_root = btrfs_root_node(root);
1464out:
1465 btrfs_free_path(path);
1466 return root;
1467
1468find_fail:
1469 kfree(root);
1470alloc_fail:
1471 root = ERR_PTR(ret);
1472 goto out;
1473}
1474
1475struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
1476 struct btrfs_key *location)
1477{
1478 struct btrfs_root *root;
1479
1480 root = btrfs_read_tree_root(tree_root, location);
1481 if (IS_ERR(root))
1482 return root;
1483
1484 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
1485 set_bit(BTRFS_ROOT_REF_COWS, &root->state);
1486 btrfs_check_and_init_root_item(&root->root_item);
1487 }
1488
1489 return root;
1490}
1491
1492int btrfs_init_fs_root(struct btrfs_root *root)
1493{
1494 int ret;
1495 struct btrfs_subvolume_writers *writers;
1496
1497 root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
1498 root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
1499 GFP_NOFS);
1500 if (!root->free_ino_pinned || !root->free_ino_ctl) {
1501 ret = -ENOMEM;
1502 goto fail;
1503 }
1504
1505 writers = btrfs_alloc_subvolume_writers();
1506 if (IS_ERR(writers)) {
1507 ret = PTR_ERR(writers);
1508 goto fail;
1509 }
1510 root->subv_writers = writers;
1511
1512 btrfs_init_free_ino_ctl(root);
1513 spin_lock_init(&root->ino_cache_lock);
1514 init_waitqueue_head(&root->ino_cache_wait);
1515
1516 ret = get_anon_bdev(&root->anon_dev);
1517 if (ret)
1518 goto fail;
1519
1520 mutex_lock(&root->objectid_mutex);
1521 ret = btrfs_find_highest_objectid(root,
1522 &root->highest_objectid);
1523 if (ret) {
1524 mutex_unlock(&root->objectid_mutex);
1525 goto fail;
1526 }
1527
1528 ASSERT(root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
1529
1530 mutex_unlock(&root->objectid_mutex);
1531
1532 return 0;
1533fail:
1534
1535 return ret;
1536}
1537
1538struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1539 u64 root_id)
1540{
1541 struct btrfs_root *root;
1542
1543 spin_lock(&fs_info->fs_roots_radix_lock);
1544 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1545 (unsigned long)root_id);
1546 spin_unlock(&fs_info->fs_roots_radix_lock);
1547 return root;
1548}
1549
1550int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
1551 struct btrfs_root *root)
1552{
1553 int ret;
1554
1555 ret = radix_tree_preload(GFP_NOFS);
1556 if (ret)
1557 return ret;
1558
1559 spin_lock(&fs_info->fs_roots_radix_lock);
1560 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1561 (unsigned long)root->root_key.objectid,
1562 root);
1563 if (ret == 0)
1564 set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
1565 spin_unlock(&fs_info->fs_roots_radix_lock);
1566 radix_tree_preload_end();
1567
1568 return ret;
1569}
1570
1571struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
1572 struct btrfs_key *location,
1573 bool check_ref)
1574{
1575 struct btrfs_root *root;
1576 struct btrfs_path *path;
1577 struct btrfs_key key;
1578 int ret;
1579
1580 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1581 return fs_info->tree_root;
1582 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
1583 return fs_info->extent_root;
1584 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
1585 return fs_info->chunk_root;
1586 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
1587 return fs_info->dev_root;
1588 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
1589 return fs_info->csum_root;
1590 if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
1591 return fs_info->quota_root ? fs_info->quota_root :
1592 ERR_PTR(-ENOENT);
1593 if (location->objectid == BTRFS_UUID_TREE_OBJECTID)
1594 return fs_info->uuid_root ? fs_info->uuid_root :
1595 ERR_PTR(-ENOENT);
1596 if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
1597 return fs_info->free_space_root ? fs_info->free_space_root :
1598 ERR_PTR(-ENOENT);
1599again:
1600 root = btrfs_lookup_fs_root(fs_info, location->objectid);
1601 if (root) {
1602 if (check_ref && btrfs_root_refs(&root->root_item) == 0)
1603 return ERR_PTR(-ENOENT);
1604 return root;
1605 }
1606
1607 root = btrfs_read_fs_root(fs_info->tree_root, location);
1608 if (IS_ERR(root))
1609 return root;
1610
1611 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1612 ret = -ENOENT;
1613 goto fail;
1614 }
1615
1616 ret = btrfs_init_fs_root(root);
1617 if (ret)
1618 goto fail;
1619
1620 path = btrfs_alloc_path();
1621 if (!path) {
1622 ret = -ENOMEM;
1623 goto fail;
1624 }
1625 key.objectid = BTRFS_ORPHAN_OBJECTID;
1626 key.type = BTRFS_ORPHAN_ITEM_KEY;
1627 key.offset = location->objectid;
1628
1629 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
1630 btrfs_free_path(path);
1631 if (ret < 0)
1632 goto fail;
1633 if (ret == 0)
1634 set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
1635
1636 ret = btrfs_insert_fs_root(fs_info, root);
1637 if (ret) {
1638 if (ret == -EEXIST) {
1639 btrfs_free_fs_root(root);
1640 goto again;
1641 }
1642 goto fail;
1643 }
1644 return root;
1645fail:
1646 btrfs_free_fs_root(root);
1647 return ERR_PTR(ret);
1648}
1649
1650static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1651{
1652 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
1653 int ret = 0;
1654 struct btrfs_device *device;
1655 struct backing_dev_info *bdi;
1656
1657 rcu_read_lock();
1658 list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
1659 if (!device->bdev)
1660 continue;
1661 bdi = device->bdev->bd_bdi;
1662 if (bdi_congested(bdi, bdi_bits)) {
1663 ret = 1;
1664 break;
1665 }
1666 }
1667 rcu_read_unlock();
1668 return ret;
1669}
1670
1671
1672
1673
1674
1675static void end_workqueue_fn(struct btrfs_work *work)
1676{
1677 struct bio *bio;
1678 struct btrfs_end_io_wq *end_io_wq;
1679
1680 end_io_wq = container_of(work, struct btrfs_end_io_wq, work);
1681 bio = end_io_wq->bio;
1682
1683 bio->bi_status = end_io_wq->status;
1684 bio->bi_private = end_io_wq->private;
1685 bio->bi_end_io = end_io_wq->end_io;
1686 kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq);
1687 bio_endio(bio);
1688}
1689
1690static int cleaner_kthread(void *arg)
1691{
1692 struct btrfs_root *root = arg;
1693 struct btrfs_fs_info *fs_info = root->fs_info;
1694 int again;
1695
1696 while (1) {
1697 again = 0;
1698
1699 set_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1700
1701
1702 if (btrfs_need_cleaner_sleep(fs_info))
1703 goto sleep;
1704
1705
1706
1707
1708
1709 if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
1710 goto sleep;
1711
1712 if (!mutex_trylock(&fs_info->cleaner_mutex))
1713 goto sleep;
1714
1715
1716
1717
1718
1719 if (btrfs_need_cleaner_sleep(fs_info)) {
1720 mutex_unlock(&fs_info->cleaner_mutex);
1721 goto sleep;
1722 }
1723
1724 btrfs_run_delayed_iputs(fs_info);
1725
1726 again = btrfs_clean_one_deleted_snapshot(root);
1727 mutex_unlock(&fs_info->cleaner_mutex);
1728
1729
1730
1731
1732
1733 btrfs_run_defrag_inodes(fs_info);
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743 btrfs_delete_unused_bgs(fs_info);
1744sleep:
1745 clear_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1746 if (kthread_should_park())
1747 kthread_parkme();
1748 if (kthread_should_stop())
1749 return 0;
1750 if (!again) {
1751 set_current_state(TASK_INTERRUPTIBLE);
1752 schedule();
1753 __set_current_state(TASK_RUNNING);
1754 }
1755 }
1756}
1757
1758static int transaction_kthread(void *arg)
1759{
1760 struct btrfs_root *root = arg;
1761 struct btrfs_fs_info *fs_info = root->fs_info;
1762 struct btrfs_trans_handle *trans;
1763 struct btrfs_transaction *cur;
1764 u64 transid;
1765 time64_t now;
1766 unsigned long delay;
1767 bool cannot_commit;
1768
1769 do {
1770 cannot_commit = false;
1771 delay = HZ * fs_info->commit_interval;
1772 mutex_lock(&fs_info->transaction_kthread_mutex);
1773
1774 spin_lock(&fs_info->trans_lock);
1775 cur = fs_info->running_transaction;
1776 if (!cur) {
1777 spin_unlock(&fs_info->trans_lock);
1778 goto sleep;
1779 }
1780
1781 now = ktime_get_seconds();
1782 if (cur->state < TRANS_STATE_BLOCKED &&
1783 !test_bit(BTRFS_FS_NEED_ASYNC_COMMIT, &fs_info->flags) &&
1784 (now < cur->start_time ||
1785 now - cur->start_time < fs_info->commit_interval)) {
1786 spin_unlock(&fs_info->trans_lock);
1787 delay = HZ * 5;
1788 goto sleep;
1789 }
1790 transid = cur->transid;
1791 spin_unlock(&fs_info->trans_lock);
1792
1793
1794 trans = btrfs_attach_transaction(root);
1795 if (IS_ERR(trans)) {
1796 if (PTR_ERR(trans) != -ENOENT)
1797 cannot_commit = true;
1798 goto sleep;
1799 }
1800 if (transid == trans->transid) {
1801 btrfs_commit_transaction(trans);
1802 } else {
1803 btrfs_end_transaction(trans);
1804 }
1805sleep:
1806 wake_up_process(fs_info->cleaner_kthread);
1807 mutex_unlock(&fs_info->transaction_kthread_mutex);
1808
1809 if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
1810 &fs_info->fs_state)))
1811 btrfs_cleanup_transaction(fs_info);
1812 if (!kthread_should_stop() &&
1813 (!btrfs_transaction_blocked(fs_info) ||
1814 cannot_commit))
1815 schedule_timeout_interruptible(delay);
1816 } while (!kthread_should_stop());
1817 return 0;
1818}
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen)
1830{
1831 u64 cur;
1832 int newest_index = -1;
1833 struct btrfs_root_backup *root_backup;
1834 int i;
1835
1836 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
1837 root_backup = info->super_copy->super_roots + i;
1838 cur = btrfs_backup_tree_root_gen(root_backup);
1839 if (cur == newest_gen)
1840 newest_index = i;
1841 }
1842
1843
1844 if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) {
1845 root_backup = info->super_copy->super_roots;
1846 cur = btrfs_backup_tree_root_gen(root_backup);
1847 if (cur == newest_gen)
1848 newest_index = 0;
1849 }
1850 return newest_index;
1851}
1852
1853
1854
1855
1856
1857
1858
1859static void find_oldest_super_backup(struct btrfs_fs_info *info,
1860 u64 newest_gen)
1861{
1862 int newest_index = -1;
1863
1864 newest_index = find_newest_super_backup(info, newest_gen);
1865
1866 if (newest_index == -1) {
1867 info->backup_root_index = 0;
1868 } else {
1869 info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS;
1870 }
1871}
1872
1873
1874
1875
1876
1877
1878static void backup_super_roots(struct btrfs_fs_info *info)
1879{
1880 int next_backup;
1881 struct btrfs_root_backup *root_backup;
1882 int last_backup;
1883
1884 next_backup = info->backup_root_index;
1885 last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) %
1886 BTRFS_NUM_BACKUP_ROOTS;
1887
1888
1889
1890
1891
1892 root_backup = info->super_for_commit->super_roots + last_backup;
1893 if (btrfs_backup_tree_root_gen(root_backup) ==
1894 btrfs_header_generation(info->tree_root->node))
1895 next_backup = last_backup;
1896
1897 root_backup = info->super_for_commit->super_roots + next_backup;
1898
1899
1900
1901
1902
1903 memset(root_backup, 0, sizeof(*root_backup));
1904
1905 info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
1906
1907 btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
1908 btrfs_set_backup_tree_root_gen(root_backup,
1909 btrfs_header_generation(info->tree_root->node));
1910
1911 btrfs_set_backup_tree_root_level(root_backup,
1912 btrfs_header_level(info->tree_root->node));
1913
1914 btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
1915 btrfs_set_backup_chunk_root_gen(root_backup,
1916 btrfs_header_generation(info->chunk_root->node));
1917 btrfs_set_backup_chunk_root_level(root_backup,
1918 btrfs_header_level(info->chunk_root->node));
1919
1920 btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start);
1921 btrfs_set_backup_extent_root_gen(root_backup,
1922 btrfs_header_generation(info->extent_root->node));
1923 btrfs_set_backup_extent_root_level(root_backup,
1924 btrfs_header_level(info->extent_root->node));
1925
1926
1927
1928
1929
1930 if (info->fs_root && info->fs_root->node) {
1931 btrfs_set_backup_fs_root(root_backup,
1932 info->fs_root->node->start);
1933 btrfs_set_backup_fs_root_gen(root_backup,
1934 btrfs_header_generation(info->fs_root->node));
1935 btrfs_set_backup_fs_root_level(root_backup,
1936 btrfs_header_level(info->fs_root->node));
1937 }
1938
1939 btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
1940 btrfs_set_backup_dev_root_gen(root_backup,
1941 btrfs_header_generation(info->dev_root->node));
1942 btrfs_set_backup_dev_root_level(root_backup,
1943 btrfs_header_level(info->dev_root->node));
1944
1945 btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start);
1946 btrfs_set_backup_csum_root_gen(root_backup,
1947 btrfs_header_generation(info->csum_root->node));
1948 btrfs_set_backup_csum_root_level(root_backup,
1949 btrfs_header_level(info->csum_root->node));
1950
1951 btrfs_set_backup_total_bytes(root_backup,
1952 btrfs_super_total_bytes(info->super_copy));
1953 btrfs_set_backup_bytes_used(root_backup,
1954 btrfs_super_bytes_used(info->super_copy));
1955 btrfs_set_backup_num_devices(root_backup,
1956 btrfs_super_num_devices(info->super_copy));
1957
1958
1959
1960
1961
1962 memcpy(&info->super_copy->super_roots,
1963 &info->super_for_commit->super_roots,
1964 sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
1965}
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975static noinline int next_root_backup(struct btrfs_fs_info *info,
1976 struct btrfs_super_block *super,
1977 int *num_backups_tried, int *backup_index)
1978{
1979 struct btrfs_root_backup *root_backup;
1980 int newest = *backup_index;
1981
1982 if (*num_backups_tried == 0) {
1983 u64 gen = btrfs_super_generation(super);
1984
1985 newest = find_newest_super_backup(info, gen);
1986 if (newest == -1)
1987 return -1;
1988
1989 *backup_index = newest;
1990 *num_backups_tried = 1;
1991 } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) {
1992
1993 return -1;
1994 } else {
1995
1996 newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) %
1997 BTRFS_NUM_BACKUP_ROOTS;
1998 *backup_index = newest;
1999 *num_backups_tried += 1;
2000 }
2001 root_backup = super->super_roots + newest;
2002
2003 btrfs_set_super_generation(super,
2004 btrfs_backup_tree_root_gen(root_backup));
2005 btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
2006 btrfs_set_super_root_level(super,
2007 btrfs_backup_tree_root_level(root_backup));
2008 btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
2009
2010
2011
2012
2013
2014 btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
2015 btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
2016 return 0;
2017}
2018
2019
2020static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
2021{
2022 btrfs_destroy_workqueue(fs_info->fixup_workers);
2023 btrfs_destroy_workqueue(fs_info->delalloc_workers);
2024 btrfs_destroy_workqueue(fs_info->workers);
2025 btrfs_destroy_workqueue(fs_info->endio_workers);
2026 btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
2027 btrfs_destroy_workqueue(fs_info->endio_repair_workers);
2028 btrfs_destroy_workqueue(fs_info->rmw_workers);
2029 btrfs_destroy_workqueue(fs_info->endio_write_workers);
2030 btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
2031 btrfs_destroy_workqueue(fs_info->submit_workers);
2032 btrfs_destroy_workqueue(fs_info->delayed_workers);
2033 btrfs_destroy_workqueue(fs_info->caching_workers);
2034 btrfs_destroy_workqueue(fs_info->readahead_workers);
2035 btrfs_destroy_workqueue(fs_info->flush_workers);
2036 btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
2037 btrfs_destroy_workqueue(fs_info->extent_workers);
2038
2039
2040
2041
2042
2043 btrfs_destroy_workqueue(fs_info->endio_meta_workers);
2044 btrfs_destroy_workqueue(fs_info->endio_meta_write_workers);
2045}
2046
2047static void free_root_extent_buffers(struct btrfs_root *root)
2048{
2049 if (root) {
2050 free_extent_buffer(root->node);
2051 free_extent_buffer(root->commit_root);
2052 root->node = NULL;
2053 root->commit_root = NULL;
2054 }
2055}
2056
2057
2058static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
2059{
2060 free_root_extent_buffers(info->tree_root);
2061
2062 free_root_extent_buffers(info->dev_root);
2063 free_root_extent_buffers(info->extent_root);
2064 free_root_extent_buffers(info->csum_root);
2065 free_root_extent_buffers(info->quota_root);
2066 free_root_extent_buffers(info->uuid_root);
2067 if (chunk_root)
2068 free_root_extent_buffers(info->chunk_root);
2069 free_root_extent_buffers(info->free_space_root);
2070}
2071
2072void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
2073{
2074 int ret;
2075 struct btrfs_root *gang[8];
2076 int i;
2077
2078 while (!list_empty(&fs_info->dead_roots)) {
2079 gang[0] = list_entry(fs_info->dead_roots.next,
2080 struct btrfs_root, root_list);
2081 list_del(&gang[0]->root_list);
2082
2083 if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) {
2084 btrfs_drop_and_free_fs_root(fs_info, gang[0]);
2085 } else {
2086 free_extent_buffer(gang[0]->node);
2087 free_extent_buffer(gang[0]->commit_root);
2088 btrfs_put_fs_root(gang[0]);
2089 }
2090 }
2091
2092 while (1) {
2093 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2094 (void **)gang, 0,
2095 ARRAY_SIZE(gang));
2096 if (!ret)
2097 break;
2098 for (i = 0; i < ret; i++)
2099 btrfs_drop_and_free_fs_root(fs_info, gang[i]);
2100 }
2101
2102 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
2103 btrfs_free_log_root_tree(NULL, fs_info);
2104 btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
2105 }
2106}
2107
2108static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
2109{
2110 mutex_init(&fs_info->scrub_lock);
2111 atomic_set(&fs_info->scrubs_running, 0);
2112 atomic_set(&fs_info->scrub_pause_req, 0);
2113 atomic_set(&fs_info->scrubs_paused, 0);
2114 atomic_set(&fs_info->scrub_cancel_req, 0);
2115 init_waitqueue_head(&fs_info->scrub_pause_wait);
2116 refcount_set(&fs_info->scrub_workers_refcnt, 0);
2117}
2118
2119static void btrfs_init_balance(struct btrfs_fs_info *fs_info)
2120{
2121 spin_lock_init(&fs_info->balance_lock);
2122 mutex_init(&fs_info->balance_mutex);
2123 atomic_set(&fs_info->balance_pause_req, 0);
2124 atomic_set(&fs_info->balance_cancel_req, 0);
2125 fs_info->balance_ctl = NULL;
2126 init_waitqueue_head(&fs_info->balance_wait_q);
2127}
2128
2129static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
2130{
2131 struct inode *inode = fs_info->btree_inode;
2132
2133 inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
2134 set_nlink(inode, 1);
2135
2136
2137
2138
2139
2140 inode->i_size = OFFSET_MAX;
2141 inode->i_mapping->a_ops = &btree_aops;
2142
2143 RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
2144 extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
2145 IO_TREE_INODE_IO, inode);
2146 BTRFS_I(inode)->io_tree.track_uptodate = false;
2147 extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
2148
2149 BTRFS_I(inode)->io_tree.ops = &btree_extent_io_ops;
2150
2151 BTRFS_I(inode)->root = fs_info->tree_root;
2152 memset(&BTRFS_I(inode)->location, 0, sizeof(struct btrfs_key));
2153 set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
2154 btrfs_insert_inode_hash(inode);
2155}
2156
2157static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
2158{
2159 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2160 init_rwsem(&fs_info->dev_replace.rwsem);
2161 init_waitqueue_head(&fs_info->dev_replace.replace_wait);
2162}
2163
2164static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)
2165{
2166 spin_lock_init(&fs_info->qgroup_lock);
2167 mutex_init(&fs_info->qgroup_ioctl_lock);
2168 fs_info->qgroup_tree = RB_ROOT;
2169 INIT_LIST_HEAD(&fs_info->dirty_qgroups);
2170 fs_info->qgroup_seq = 1;
2171 fs_info->qgroup_ulist = NULL;
2172 fs_info->qgroup_rescan_running = false;
2173 mutex_init(&fs_info->qgroup_rescan_lock);
2174}
2175
2176static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info,
2177 struct btrfs_fs_devices *fs_devices)
2178{
2179 u32 max_active = fs_info->thread_pool_size;
2180 unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
2181
2182 fs_info->workers =
2183 btrfs_alloc_workqueue(fs_info, "worker",
2184 flags | WQ_HIGHPRI, max_active, 16);
2185
2186 fs_info->delalloc_workers =
2187 btrfs_alloc_workqueue(fs_info, "delalloc",
2188 flags, max_active, 2);
2189
2190 fs_info->flush_workers =
2191 btrfs_alloc_workqueue(fs_info, "flush_delalloc",
2192 flags, max_active, 0);
2193
2194 fs_info->caching_workers =
2195 btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0);
2196
2197
2198
2199
2200
2201
2202 fs_info->submit_workers =
2203 btrfs_alloc_workqueue(fs_info, "submit", flags,
2204 min_t(u64, fs_devices->num_devices,
2205 max_active), 64);
2206
2207 fs_info->fixup_workers =
2208 btrfs_alloc_workqueue(fs_info, "fixup", flags, 1, 0);
2209
2210
2211
2212
2213
2214 fs_info->endio_workers =
2215 btrfs_alloc_workqueue(fs_info, "endio", flags, max_active, 4);
2216 fs_info->endio_meta_workers =
2217 btrfs_alloc_workqueue(fs_info, "endio-meta", flags,
2218 max_active, 4);
2219 fs_info->endio_meta_write_workers =
2220 btrfs_alloc_workqueue(fs_info, "endio-meta-write", flags,
2221 max_active, 2);
2222 fs_info->endio_raid56_workers =
2223 btrfs_alloc_workqueue(fs_info, "endio-raid56", flags,
2224 max_active, 4);
2225 fs_info->endio_repair_workers =
2226 btrfs_alloc_workqueue(fs_info, "endio-repair", flags, 1, 0);
2227 fs_info->rmw_workers =
2228 btrfs_alloc_workqueue(fs_info, "rmw", flags, max_active, 2);
2229 fs_info->endio_write_workers =
2230 btrfs_alloc_workqueue(fs_info, "endio-write", flags,
2231 max_active, 2);
2232 fs_info->endio_freespace_worker =
2233 btrfs_alloc_workqueue(fs_info, "freespace-write", flags,
2234 max_active, 0);
2235 fs_info->delayed_workers =
2236 btrfs_alloc_workqueue(fs_info, "delayed-meta", flags,
2237 max_active, 0);
2238 fs_info->readahead_workers =
2239 btrfs_alloc_workqueue(fs_info, "readahead", flags,
2240 max_active, 2);
2241 fs_info->qgroup_rescan_workers =
2242 btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0);
2243 fs_info->extent_workers =
2244 btrfs_alloc_workqueue(fs_info, "extent-refs", flags,
2245 min_t(u64, fs_devices->num_devices,
2246 max_active), 8);
2247
2248 if (!(fs_info->workers && fs_info->delalloc_workers &&
2249 fs_info->submit_workers && fs_info->flush_workers &&
2250 fs_info->endio_workers && fs_info->endio_meta_workers &&
2251 fs_info->endio_meta_write_workers &&
2252 fs_info->endio_repair_workers &&
2253 fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
2254 fs_info->endio_freespace_worker && fs_info->rmw_workers &&
2255 fs_info->caching_workers && fs_info->readahead_workers &&
2256 fs_info->fixup_workers && fs_info->delayed_workers &&
2257 fs_info->extent_workers &&
2258 fs_info->qgroup_rescan_workers)) {
2259 return -ENOMEM;
2260 }
2261
2262 return 0;
2263}
2264
2265static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
2266 struct btrfs_fs_devices *fs_devices)
2267{
2268 int ret;
2269 struct btrfs_root *log_tree_root;
2270 struct btrfs_super_block *disk_super = fs_info->super_copy;
2271 u64 bytenr = btrfs_super_log_root(disk_super);
2272 int level = btrfs_super_log_root_level(disk_super);
2273
2274 if (fs_devices->rw_devices == 0) {
2275 btrfs_warn(fs_info, "log replay required on RO media");
2276 return -EIO;
2277 }
2278
2279 log_tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
2280 if (!log_tree_root)
2281 return -ENOMEM;
2282
2283 __setup_root(log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
2284
2285 log_tree_root->node = read_tree_block(fs_info, bytenr,
2286 fs_info->generation + 1,
2287 level, NULL);
2288 if (IS_ERR(log_tree_root->node)) {
2289 btrfs_warn(fs_info, "failed to read log tree");
2290 ret = PTR_ERR(log_tree_root->node);
2291 kfree(log_tree_root);
2292 return ret;
2293 } else if (!extent_buffer_uptodate(log_tree_root->node)) {
2294 btrfs_err(fs_info, "failed to read log tree");
2295 free_extent_buffer(log_tree_root->node);
2296 kfree(log_tree_root);
2297 return -EIO;
2298 }
2299
2300 ret = btrfs_recover_log_trees(log_tree_root);
2301 if (ret) {
2302 btrfs_handle_fs_error(fs_info, ret,
2303 "Failed to recover log tree");
2304 free_extent_buffer(log_tree_root->node);
2305 kfree(log_tree_root);
2306 return ret;
2307 }
2308
2309 if (sb_rdonly(fs_info->sb)) {
2310 ret = btrfs_commit_super(fs_info);
2311 if (ret)
2312 return ret;
2313 }
2314
2315 return 0;
2316}
2317
2318static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
2319{
2320 struct btrfs_root *tree_root = fs_info->tree_root;
2321 struct btrfs_root *root;
2322 struct btrfs_key location;
2323 int ret;
2324
2325 BUG_ON(!fs_info->tree_root);
2326
2327 location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
2328 location.type = BTRFS_ROOT_ITEM_KEY;
2329 location.offset = 0;
2330
2331 root = btrfs_read_tree_root(tree_root, &location);
2332 if (IS_ERR(root)) {
2333 ret = PTR_ERR(root);
2334 goto out;
2335 }
2336 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2337 fs_info->extent_root = root;
2338
2339 location.objectid = BTRFS_DEV_TREE_OBJECTID;
2340 root = btrfs_read_tree_root(tree_root, &location);
2341 if (IS_ERR(root)) {
2342 ret = PTR_ERR(root);
2343 goto out;
2344 }
2345 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2346 fs_info->dev_root = root;
2347 btrfs_init_devices_late(fs_info);
2348
2349 location.objectid = BTRFS_CSUM_TREE_OBJECTID;
2350 root = btrfs_read_tree_root(tree_root, &location);
2351 if (IS_ERR(root)) {
2352 ret = PTR_ERR(root);
2353 goto out;
2354 }
2355 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2356 fs_info->csum_root = root;
2357
2358 location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
2359 root = btrfs_read_tree_root(tree_root, &location);
2360 if (!IS_ERR(root)) {
2361 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2362 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
2363 fs_info->quota_root = root;
2364 }
2365
2366 location.objectid = BTRFS_UUID_TREE_OBJECTID;
2367 root = btrfs_read_tree_root(tree_root, &location);
2368 if (IS_ERR(root)) {
2369 ret = PTR_ERR(root);
2370 if (ret != -ENOENT)
2371 goto out;
2372 } else {
2373 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2374 fs_info->uuid_root = root;
2375 }
2376
2377 if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
2378 location.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID;
2379 root = btrfs_read_tree_root(tree_root, &location);
2380 if (IS_ERR(root)) {
2381 ret = PTR_ERR(root);
2382 goto out;
2383 }
2384 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2385 fs_info->free_space_root = root;
2386 }
2387
2388 return 0;
2389out:
2390 btrfs_warn(fs_info, "failed to read root (objectid=%llu): %d",
2391 location.objectid, ret);
2392 return ret;
2393}
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405static int validate_super(struct btrfs_fs_info *fs_info,
2406 struct btrfs_super_block *sb, int mirror_num)
2407{
2408 u64 nodesize = btrfs_super_nodesize(sb);
2409 u64 sectorsize = btrfs_super_sectorsize(sb);
2410 int ret = 0;
2411
2412 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
2413 btrfs_err(fs_info, "no valid FS found");
2414 ret = -EINVAL;
2415 }
2416 if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP) {
2417 btrfs_err(fs_info, "unrecognized or unsupported super flag: %llu",
2418 btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
2419 ret = -EINVAL;
2420 }
2421 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
2422 btrfs_err(fs_info, "tree_root level too big: %d >= %d",
2423 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
2424 ret = -EINVAL;
2425 }
2426 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
2427 btrfs_err(fs_info, "chunk_root level too big: %d >= %d",
2428 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
2429 ret = -EINVAL;
2430 }
2431 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
2432 btrfs_err(fs_info, "log_root level too big: %d >= %d",
2433 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
2434 ret = -EINVAL;
2435 }
2436
2437
2438
2439
2440
2441 if (!is_power_of_2(sectorsize) || sectorsize < 4096 ||
2442 sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2443 btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
2444 ret = -EINVAL;
2445 }
2446
2447 if (sectorsize != PAGE_SIZE) {
2448 btrfs_err(fs_info,
2449 "sectorsize %llu not supported yet, only support %lu",
2450 sectorsize, PAGE_SIZE);
2451 ret = -EINVAL;
2452 }
2453 if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
2454 nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2455 btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
2456 ret = -EINVAL;
2457 }
2458 if (nodesize != le32_to_cpu(sb->__unused_leafsize)) {
2459 btrfs_err(fs_info, "invalid leafsize %u, should be %llu",
2460 le32_to_cpu(sb->__unused_leafsize), nodesize);
2461 ret = -EINVAL;
2462 }
2463
2464
2465 if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) {
2466 btrfs_warn(fs_info, "tree_root block unaligned: %llu",
2467 btrfs_super_root(sb));
2468 ret = -EINVAL;
2469 }
2470 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) {
2471 btrfs_warn(fs_info, "chunk_root block unaligned: %llu",
2472 btrfs_super_chunk_root(sb));
2473 ret = -EINVAL;
2474 }
2475 if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) {
2476 btrfs_warn(fs_info, "log_root block unaligned: %llu",
2477 btrfs_super_log_root(sb));
2478 ret = -EINVAL;
2479 }
2480
2481 if (memcmp(fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid,
2482 BTRFS_FSID_SIZE) != 0) {
2483 btrfs_err(fs_info,
2484 "dev_item UUID does not match metadata fsid: %pU != %pU",
2485 fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid);
2486 ret = -EINVAL;
2487 }
2488
2489
2490
2491
2492
2493 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
2494 btrfs_err(fs_info, "bytes_used is too small %llu",
2495 btrfs_super_bytes_used(sb));
2496 ret = -EINVAL;
2497 }
2498 if (!is_power_of_2(btrfs_super_stripesize(sb))) {
2499 btrfs_err(fs_info, "invalid stripesize %u",
2500 btrfs_super_stripesize(sb));
2501 ret = -EINVAL;
2502 }
2503 if (btrfs_super_num_devices(sb) > (1UL << 31))
2504 btrfs_warn(fs_info, "suspicious number of devices: %llu",
2505 btrfs_super_num_devices(sb));
2506 if (btrfs_super_num_devices(sb) == 0) {
2507 btrfs_err(fs_info, "number of devices is 0");
2508 ret = -EINVAL;
2509 }
2510
2511 if (mirror_num >= 0 &&
2512 btrfs_super_bytenr(sb) != btrfs_sb_offset(mirror_num)) {
2513 btrfs_err(fs_info, "super offset mismatch %llu != %u",
2514 btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
2515 ret = -EINVAL;
2516 }
2517
2518
2519
2520
2521
2522 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
2523 btrfs_err(fs_info, "system chunk array too big %u > %u",
2524 btrfs_super_sys_array_size(sb),
2525 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
2526 ret = -EINVAL;
2527 }
2528 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
2529 + sizeof(struct btrfs_chunk)) {
2530 btrfs_err(fs_info, "system chunk array too small %u < %zu",
2531 btrfs_super_sys_array_size(sb),
2532 sizeof(struct btrfs_disk_key)
2533 + sizeof(struct btrfs_chunk));
2534 ret = -EINVAL;
2535 }
2536
2537
2538
2539
2540
2541 if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
2542 btrfs_warn(fs_info,
2543 "suspicious: generation < chunk_root_generation: %llu < %llu",
2544 btrfs_super_generation(sb),
2545 btrfs_super_chunk_root_generation(sb));
2546 if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
2547 && btrfs_super_cache_generation(sb) != (u64)-1)
2548 btrfs_warn(fs_info,
2549 "suspicious: generation < cache_generation: %llu < %llu",
2550 btrfs_super_generation(sb),
2551 btrfs_super_cache_generation(sb));
2552
2553 return ret;
2554}
2555
2556
2557
2558
2559
2560
2561static int btrfs_validate_mount_super(struct btrfs_fs_info *fs_info)
2562{
2563 return validate_super(fs_info, fs_info->super_copy, 0);
2564}
2565
2566
2567
2568
2569
2570
2571
2572static int btrfs_validate_write_super(struct btrfs_fs_info *fs_info,
2573 struct btrfs_super_block *sb)
2574{
2575 int ret;
2576
2577 ret = validate_super(fs_info, sb, -1);
2578 if (ret < 0)
2579 goto out;
2580 if (btrfs_super_csum_type(sb) != BTRFS_CSUM_TYPE_CRC32) {
2581 ret = -EUCLEAN;
2582 btrfs_err(fs_info, "invalid csum type, has %u want %u",
2583 btrfs_super_csum_type(sb), BTRFS_CSUM_TYPE_CRC32);
2584 goto out;
2585 }
2586 if (btrfs_super_incompat_flags(sb) & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
2587 ret = -EUCLEAN;
2588 btrfs_err(fs_info,
2589 "invalid incompat flags, has 0x%llx valid mask 0x%llx",
2590 btrfs_super_incompat_flags(sb),
2591 (unsigned long long)BTRFS_FEATURE_INCOMPAT_SUPP);
2592 goto out;
2593 }
2594out:
2595 if (ret < 0)
2596 btrfs_err(fs_info,
2597 "super block corruption detected before writing it to disk");
2598 return ret;
2599}
2600
2601int open_ctree(struct super_block *sb,
2602 struct btrfs_fs_devices *fs_devices,
2603 char *options)
2604{
2605 u32 sectorsize;
2606 u32 nodesize;
2607 u32 stripesize;
2608 u64 generation;
2609 u64 features;
2610 struct btrfs_key location;
2611 struct buffer_head *bh;
2612 struct btrfs_super_block *disk_super;
2613 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2614 struct btrfs_root *tree_root;
2615 struct btrfs_root *chunk_root;
2616 int ret;
2617 int err = -EINVAL;
2618 int num_backups_tried = 0;
2619 int backup_index = 0;
2620 int clear_free_space_tree = 0;
2621 int level;
2622
2623 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
2624 chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
2625 if (!tree_root || !chunk_root) {
2626 err = -ENOMEM;
2627 goto fail;
2628 }
2629
2630 ret = init_srcu_struct(&fs_info->subvol_srcu);
2631 if (ret) {
2632 err = ret;
2633 goto fail;
2634 }
2635
2636 ret = percpu_counter_init(&fs_info->dio_bytes, 0, GFP_KERNEL);
2637 if (ret) {
2638 err = ret;
2639 goto fail_srcu;
2640 }
2641
2642 ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
2643 if (ret) {
2644 err = ret;
2645 goto fail_dio_bytes;
2646 }
2647 fs_info->dirty_metadata_batch = PAGE_SIZE *
2648 (1 + ilog2(nr_cpu_ids));
2649
2650 ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
2651 if (ret) {
2652 err = ret;
2653 goto fail_dirty_metadata_bytes;
2654 }
2655
2656 ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
2657 GFP_KERNEL);
2658 if (ret) {
2659 err = ret;
2660 goto fail_delalloc_bytes;
2661 }
2662
2663 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
2664 INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
2665 INIT_LIST_HEAD(&fs_info->trans_list);
2666 INIT_LIST_HEAD(&fs_info->dead_roots);
2667 INIT_LIST_HEAD(&fs_info->delayed_iputs);
2668 INIT_LIST_HEAD(&fs_info->delalloc_roots);
2669 INIT_LIST_HEAD(&fs_info->caching_block_groups);
2670 INIT_LIST_HEAD(&fs_info->pending_raid_kobjs);
2671 spin_lock_init(&fs_info->pending_raid_kobjs_lock);
2672 spin_lock_init(&fs_info->delalloc_root_lock);
2673 spin_lock_init(&fs_info->trans_lock);
2674 spin_lock_init(&fs_info->fs_roots_radix_lock);
2675 spin_lock_init(&fs_info->delayed_iput_lock);
2676 spin_lock_init(&fs_info->defrag_inodes_lock);
2677 spin_lock_init(&fs_info->tree_mod_seq_lock);
2678 spin_lock_init(&fs_info->super_lock);
2679 spin_lock_init(&fs_info->buffer_lock);
2680 spin_lock_init(&fs_info->unused_bgs_lock);
2681 rwlock_init(&fs_info->tree_mod_log_lock);
2682 mutex_init(&fs_info->unused_bg_unpin_mutex);
2683 mutex_init(&fs_info->delete_unused_bgs_mutex);
2684 mutex_init(&fs_info->reloc_mutex);
2685 mutex_init(&fs_info->delalloc_root_mutex);
2686 seqlock_init(&fs_info->profiles_lock);
2687
2688 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
2689 INIT_LIST_HEAD(&fs_info->space_info);
2690 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
2691 INIT_LIST_HEAD(&fs_info->unused_bgs);
2692 btrfs_mapping_init(&fs_info->mapping_tree);
2693 btrfs_init_block_rsv(&fs_info->global_block_rsv,
2694 BTRFS_BLOCK_RSV_GLOBAL);
2695 btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
2696 btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
2697 btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
2698 btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
2699 BTRFS_BLOCK_RSV_DELOPS);
2700 btrfs_init_block_rsv(&fs_info->delayed_refs_rsv,
2701 BTRFS_BLOCK_RSV_DELREFS);
2702
2703 atomic_set(&fs_info->async_delalloc_pages, 0);
2704 atomic_set(&fs_info->defrag_running, 0);
2705 atomic_set(&fs_info->reada_works_cnt, 0);
2706 atomic_set(&fs_info->nr_delayed_iputs, 0);
2707 atomic64_set(&fs_info->tree_mod_seq, 0);
2708 fs_info->sb = sb;
2709 fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
2710 fs_info->metadata_ratio = 0;
2711 fs_info->defrag_inodes = RB_ROOT;
2712 atomic64_set(&fs_info->free_chunk_space, 0);
2713 fs_info->tree_mod_log = RB_ROOT;
2714 fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
2715 fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6;
2716
2717 INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
2718 spin_lock_init(&fs_info->reada_lock);
2719 btrfs_init_ref_verify(fs_info);
2720
2721 fs_info->thread_pool_size = min_t(unsigned long,
2722 num_online_cpus() + 2, 8);
2723
2724 INIT_LIST_HEAD(&fs_info->ordered_roots);
2725 spin_lock_init(&fs_info->ordered_root_lock);
2726
2727 fs_info->btree_inode = new_inode(sb);
2728 if (!fs_info->btree_inode) {
2729 err = -ENOMEM;
2730 goto fail_bio_counter;
2731 }
2732 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
2733
2734 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
2735 GFP_KERNEL);
2736 if (!fs_info->delayed_root) {
2737 err = -ENOMEM;
2738 goto fail_iput;
2739 }
2740 btrfs_init_delayed_root(fs_info->delayed_root);
2741
2742 btrfs_init_scrub(fs_info);
2743#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2744 fs_info->check_integrity_print_mask = 0;
2745#endif
2746 btrfs_init_balance(fs_info);
2747 btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work);
2748
2749 sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
2750 sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
2751
2752 btrfs_init_btree_inode(fs_info);
2753
2754 spin_lock_init(&fs_info->block_group_cache_lock);
2755 fs_info->block_group_cache_tree = RB_ROOT;
2756 fs_info->first_logical_byte = (u64)-1;
2757
2758 extent_io_tree_init(fs_info, &fs_info->freed_extents[0],
2759 IO_TREE_FS_INFO_FREED_EXTENTS0, NULL);
2760 extent_io_tree_init(fs_info, &fs_info->freed_extents[1],
2761 IO_TREE_FS_INFO_FREED_EXTENTS1, NULL);
2762 fs_info->pinned_extents = &fs_info->freed_extents[0];
2763 set_bit(BTRFS_FS_BARRIER, &fs_info->flags);
2764
2765 mutex_init(&fs_info->ordered_operations_mutex);
2766 mutex_init(&fs_info->tree_log_mutex);
2767 mutex_init(&fs_info->chunk_mutex);
2768 mutex_init(&fs_info->transaction_kthread_mutex);
2769 mutex_init(&fs_info->cleaner_mutex);
2770 mutex_init(&fs_info->ro_block_group_mutex);
2771 init_rwsem(&fs_info->commit_root_sem);
2772 init_rwsem(&fs_info->cleanup_work_sem);
2773 init_rwsem(&fs_info->subvol_sem);
2774 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
2775
2776 btrfs_init_dev_replace_locks(fs_info);
2777 btrfs_init_qgroup(fs_info);
2778
2779 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
2780 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
2781
2782 init_waitqueue_head(&fs_info->transaction_throttle);
2783 init_waitqueue_head(&fs_info->transaction_wait);
2784 init_waitqueue_head(&fs_info->transaction_blocked_wait);
2785 init_waitqueue_head(&fs_info->async_submit_wait);
2786 init_waitqueue_head(&fs_info->delayed_iputs_wait);
2787
2788
2789 fs_info->nodesize = 4096;
2790 fs_info->sectorsize = 4096;
2791 fs_info->stripesize = 4096;
2792
2793 spin_lock_init(&fs_info->swapfile_pins_lock);
2794 fs_info->swapfile_pins = RB_ROOT;
2795
2796 ret = btrfs_alloc_stripe_hash_table(fs_info);
2797 if (ret) {
2798 err = ret;
2799 goto fail_alloc;
2800 }
2801
2802 __setup_root(tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
2803
2804 invalidate_bdev(fs_devices->latest_bdev);
2805
2806
2807
2808
2809 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
2810 if (IS_ERR(bh)) {
2811 err = PTR_ERR(bh);
2812 goto fail_alloc;
2813 }
2814
2815
2816
2817
2818
2819 if (btrfs_check_super_csum(fs_info, bh->b_data)) {
2820 btrfs_err(fs_info, "superblock checksum mismatch");
2821 err = -EINVAL;
2822 brelse(bh);
2823 goto fail_alloc;
2824 }
2825
2826
2827
2828
2829
2830
2831 memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy));
2832 brelse(bh);
2833
2834 disk_super = fs_info->super_copy;
2835
2836 ASSERT(!memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid,
2837 BTRFS_FSID_SIZE));
2838
2839 if (btrfs_fs_incompat(fs_info, METADATA_UUID)) {
2840 ASSERT(!memcmp(fs_info->fs_devices->metadata_uuid,
2841 fs_info->super_copy->metadata_uuid,
2842 BTRFS_FSID_SIZE));
2843 }
2844
2845 features = btrfs_super_flags(disk_super);
2846 if (features & BTRFS_SUPER_FLAG_CHANGING_FSID_V2) {
2847 features &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
2848 btrfs_set_super_flags(disk_super, features);
2849 btrfs_info(fs_info,
2850 "found metadata UUID change in progress flag, clearing");
2851 }
2852
2853 memcpy(fs_info->super_for_commit, fs_info->super_copy,
2854 sizeof(*fs_info->super_for_commit));
2855
2856 ret = btrfs_validate_mount_super(fs_info);
2857 if (ret) {
2858 btrfs_err(fs_info, "superblock contains fatal errors");
2859 err = -EINVAL;
2860 goto fail_alloc;
2861 }
2862
2863 if (!btrfs_super_root(disk_super))
2864 goto fail_alloc;
2865
2866
2867 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
2868 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
2869
2870
2871
2872
2873
2874 generation = btrfs_super_generation(disk_super);
2875 find_oldest_super_backup(fs_info, generation);
2876
2877
2878
2879
2880
2881 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
2882
2883 ret = btrfs_parse_options(fs_info, options, sb->s_flags);
2884 if (ret) {
2885 err = ret;
2886 goto fail_alloc;
2887 }
2888
2889 features = btrfs_super_incompat_flags(disk_super) &
2890 ~BTRFS_FEATURE_INCOMPAT_SUPP;
2891 if (features) {
2892 btrfs_err(fs_info,
2893 "cannot mount because of unsupported optional features (%llx)",
2894 features);
2895 err = -EINVAL;
2896 goto fail_alloc;
2897 }
2898
2899 features = btrfs_super_incompat_flags(disk_super);
2900 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
2901 if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
2902 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
2903 else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD)
2904 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD;
2905
2906 if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
2907 btrfs_info(fs_info, "has skinny extents");
2908
2909
2910
2911
2912
2913 if (btrfs_super_nodesize(disk_super) > PAGE_SIZE) {
2914 if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
2915 btrfs_info(fs_info,
2916 "flagging fs with big metadata feature");
2917 features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
2918 }
2919
2920 nodesize = btrfs_super_nodesize(disk_super);
2921 sectorsize = btrfs_super_sectorsize(disk_super);
2922 stripesize = sectorsize;
2923 fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
2924 fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
2925
2926
2927 fs_info->nodesize = nodesize;
2928 fs_info->sectorsize = sectorsize;
2929 fs_info->stripesize = stripesize;
2930
2931
2932
2933
2934
2935 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
2936 (sectorsize != nodesize)) {
2937 btrfs_err(fs_info,
2938"unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
2939 nodesize, sectorsize);
2940 goto fail_alloc;
2941 }
2942
2943
2944
2945
2946
2947 btrfs_set_super_incompat_flags(disk_super, features);
2948
2949 features = btrfs_super_compat_ro_flags(disk_super) &
2950 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
2951 if (!sb_rdonly(sb) && features) {
2952 btrfs_err(fs_info,
2953 "cannot mount read-write because of unsupported optional features (%llx)",
2954 features);
2955 err = -EINVAL;
2956 goto fail_alloc;
2957 }
2958
2959 ret = btrfs_init_workqueues(fs_info, fs_devices);
2960 if (ret) {
2961 err = ret;
2962 goto fail_sb_buffer;
2963 }
2964
2965 sb->s_bdi->congested_fn = btrfs_congested_fn;
2966 sb->s_bdi->congested_data = fs_info;
2967 sb->s_bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK;
2968 sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
2969 sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
2970 sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
2971
2972 sb->s_blocksize = sectorsize;
2973 sb->s_blocksize_bits = blksize_bits(sectorsize);
2974 memcpy(&sb->s_uuid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE);
2975
2976 mutex_lock(&fs_info->chunk_mutex);
2977 ret = btrfs_read_sys_array(fs_info);
2978 mutex_unlock(&fs_info->chunk_mutex);
2979 if (ret) {
2980 btrfs_err(fs_info, "failed to read the system array: %d", ret);
2981 goto fail_sb_buffer;
2982 }
2983
2984 generation = btrfs_super_chunk_root_generation(disk_super);
2985 level = btrfs_super_chunk_root_level(disk_super);
2986
2987 __setup_root(chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
2988
2989 chunk_root->node = read_tree_block(fs_info,
2990 btrfs_super_chunk_root(disk_super),
2991 generation, level, NULL);
2992 if (IS_ERR(chunk_root->node) ||
2993 !extent_buffer_uptodate(chunk_root->node)) {
2994 btrfs_err(fs_info, "failed to read chunk root");
2995 if (!IS_ERR(chunk_root->node))
2996 free_extent_buffer(chunk_root->node);
2997 chunk_root->node = NULL;
2998 goto fail_tree_roots;
2999 }
3000 btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
3001 chunk_root->commit_root = btrfs_root_node(chunk_root);
3002
3003 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
3004 btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE);
3005
3006 ret = btrfs_read_chunk_tree(fs_info);
3007 if (ret) {
3008 btrfs_err(fs_info, "failed to read chunk tree: %d", ret);
3009 goto fail_tree_roots;
3010 }
3011
3012
3013
3014
3015
3016 btrfs_free_extra_devids(fs_devices, 0);
3017
3018 if (!fs_devices->latest_bdev) {
3019 btrfs_err(fs_info, "failed to read devices");
3020 goto fail_tree_roots;
3021 }
3022
3023retry_root_backup:
3024 generation = btrfs_super_generation(disk_super);
3025 level = btrfs_super_root_level(disk_super);
3026
3027 tree_root->node = read_tree_block(fs_info,
3028 btrfs_super_root(disk_super),
3029 generation, level, NULL);
3030 if (IS_ERR(tree_root->node) ||
3031 !extent_buffer_uptodate(tree_root->node)) {
3032 btrfs_warn(fs_info, "failed to read tree root");
3033 if (!IS_ERR(tree_root->node))
3034 free_extent_buffer(tree_root->node);
3035 tree_root->node = NULL;
3036 goto recovery_tree_root;
3037 }
3038
3039 btrfs_set_root_node(&tree_root->root_item, tree_root->node);
3040 tree_root->commit_root = btrfs_root_node(tree_root);
3041 btrfs_set_root_refs(&tree_root->root_item, 1);
3042
3043 mutex_lock(&tree_root->objectid_mutex);
3044 ret = btrfs_find_highest_objectid(tree_root,
3045 &tree_root->highest_objectid);
3046 if (ret) {
3047 mutex_unlock(&tree_root->objectid_mutex);
3048 goto recovery_tree_root;
3049 }
3050
3051 ASSERT(tree_root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
3052
3053 mutex_unlock(&tree_root->objectid_mutex);
3054
3055 ret = btrfs_read_roots(fs_info);
3056 if (ret)
3057 goto recovery_tree_root;
3058
3059 fs_info->generation = generation;
3060 fs_info->last_trans_committed = generation;
3061
3062 ret = btrfs_verify_dev_extents(fs_info);
3063 if (ret) {
3064 btrfs_err(fs_info,
3065 "failed to verify dev extents against chunks: %d",
3066 ret);
3067 goto fail_block_groups;
3068 }
3069 ret = btrfs_recover_balance(fs_info);
3070 if (ret) {
3071 btrfs_err(fs_info, "failed to recover balance: %d", ret);
3072 goto fail_block_groups;
3073 }
3074
3075 ret = btrfs_init_dev_stats(fs_info);
3076 if (ret) {
3077 btrfs_err(fs_info, "failed to init dev_stats: %d", ret);
3078 goto fail_block_groups;
3079 }
3080
3081 ret = btrfs_init_dev_replace(fs_info);
3082 if (ret) {
3083 btrfs_err(fs_info, "failed to init dev_replace: %d", ret);
3084 goto fail_block_groups;
3085 }
3086
3087 btrfs_free_extra_devids(fs_devices, 1);
3088
3089 ret = btrfs_sysfs_add_fsid(fs_devices, NULL);
3090 if (ret) {
3091 btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
3092 ret);
3093 goto fail_block_groups;
3094 }
3095
3096 ret = btrfs_sysfs_add_device(fs_devices);
3097 if (ret) {
3098 btrfs_err(fs_info, "failed to init sysfs device interface: %d",
3099 ret);
3100 goto fail_fsdev_sysfs;
3101 }
3102
3103 ret = btrfs_sysfs_add_mounted(fs_info);
3104 if (ret) {
3105 btrfs_err(fs_info, "failed to init sysfs interface: %d", ret);
3106 goto fail_fsdev_sysfs;
3107 }
3108
3109 ret = btrfs_init_space_info(fs_info);
3110 if (ret) {
3111 btrfs_err(fs_info, "failed to initialize space info: %d", ret);
3112 goto fail_sysfs;
3113 }
3114
3115 ret = btrfs_read_block_groups(fs_info);
3116 if (ret) {
3117 btrfs_err(fs_info, "failed to read block groups: %d", ret);
3118 goto fail_sysfs;
3119 }
3120
3121 if (!sb_rdonly(sb) && !btrfs_check_rw_degradable(fs_info, NULL)) {
3122 btrfs_warn(fs_info,
3123 "writable mount is not allowed due to too many missing devices");
3124 goto fail_sysfs;
3125 }
3126
3127 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
3128 "btrfs-cleaner");
3129 if (IS_ERR(fs_info->cleaner_kthread))
3130 goto fail_sysfs;
3131
3132 fs_info->transaction_kthread = kthread_run(transaction_kthread,
3133 tree_root,
3134 "btrfs-transaction");
3135 if (IS_ERR(fs_info->transaction_kthread))
3136 goto fail_cleaner;
3137
3138 if (!btrfs_test_opt(fs_info, NOSSD) &&
3139 !fs_info->fs_devices->rotating) {
3140 btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
3141 }
3142
3143
3144
3145
3146
3147 btrfs_apply_pending_changes(fs_info);
3148
3149#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3150 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY)) {
3151 ret = btrfsic_mount(fs_info, fs_devices,
3152 btrfs_test_opt(fs_info,
3153 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ?
3154 1 : 0,
3155 fs_info->check_integrity_print_mask);
3156 if (ret)
3157 btrfs_warn(fs_info,
3158 "failed to initialize integrity check module: %d",
3159 ret);
3160 }
3161#endif
3162 ret = btrfs_read_qgroup_config(fs_info);
3163 if (ret)
3164 goto fail_trans_kthread;
3165
3166 if (btrfs_build_ref_tree(fs_info))
3167 btrfs_err(fs_info, "couldn't build ref tree");
3168
3169
3170 if (btrfs_super_log_root(disk_super) != 0 &&
3171 !btrfs_test_opt(fs_info, NOLOGREPLAY)) {
3172 ret = btrfs_replay_log(fs_info, fs_devices);
3173 if (ret) {
3174 err = ret;
3175 goto fail_qgroup;
3176 }
3177 }
3178
3179 ret = btrfs_find_orphan_roots(fs_info);
3180 if (ret)
3181 goto fail_qgroup;
3182
3183 if (!sb_rdonly(sb)) {
3184 ret = btrfs_cleanup_fs_roots(fs_info);
3185 if (ret)
3186 goto fail_qgroup;
3187
3188 mutex_lock(&fs_info->cleaner_mutex);
3189 ret = btrfs_recover_relocation(tree_root);
3190 mutex_unlock(&fs_info->cleaner_mutex);
3191 if (ret < 0) {
3192 btrfs_warn(fs_info, "failed to recover relocation: %d",
3193 ret);
3194 err = -EINVAL;
3195 goto fail_qgroup;
3196 }
3197 }
3198
3199 location.objectid = BTRFS_FS_TREE_OBJECTID;
3200 location.type = BTRFS_ROOT_ITEM_KEY;
3201 location.offset = 0;
3202
3203 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
3204 if (IS_ERR(fs_info->fs_root)) {
3205 err = PTR_ERR(fs_info->fs_root);
3206 btrfs_warn(fs_info, "failed to read fs tree: %d", err);
3207 goto fail_qgroup;
3208 }
3209
3210 if (sb_rdonly(sb))
3211 return 0;
3212
3213 if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
3214 btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3215 clear_free_space_tree = 1;
3216 } else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
3217 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
3218 btrfs_warn(fs_info, "free space tree is invalid");
3219 clear_free_space_tree = 1;
3220 }
3221
3222 if (clear_free_space_tree) {
3223 btrfs_info(fs_info, "clearing free space tree");
3224 ret = btrfs_clear_free_space_tree(fs_info);
3225 if (ret) {
3226 btrfs_warn(fs_info,
3227 "failed to clear free space tree: %d", ret);
3228 close_ctree(fs_info);
3229 return ret;
3230 }
3231 }
3232
3233 if (btrfs_test_opt(fs_info, FREE_SPACE_TREE) &&
3234 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3235 btrfs_info(fs_info, "creating free space tree");
3236 ret = btrfs_create_free_space_tree(fs_info);
3237 if (ret) {
3238 btrfs_warn(fs_info,
3239 "failed to create free space tree: %d", ret);
3240 close_ctree(fs_info);
3241 return ret;
3242 }
3243 }
3244
3245 down_read(&fs_info->cleanup_work_sem);
3246 if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
3247 (ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
3248 up_read(&fs_info->cleanup_work_sem);
3249 close_ctree(fs_info);
3250 return ret;
3251 }
3252 up_read(&fs_info->cleanup_work_sem);
3253
3254 ret = btrfs_resume_balance_async(fs_info);
3255 if (ret) {
3256 btrfs_warn(fs_info, "failed to resume balance: %d", ret);
3257 close_ctree(fs_info);
3258 return ret;
3259 }
3260
3261 ret = btrfs_resume_dev_replace_async(fs_info);
3262 if (ret) {
3263 btrfs_warn(fs_info, "failed to resume device replace: %d", ret);
3264 close_ctree(fs_info);
3265 return ret;
3266 }
3267
3268 btrfs_qgroup_rescan_resume(fs_info);
3269
3270 if (!fs_info->uuid_root) {
3271 btrfs_info(fs_info, "creating UUID tree");
3272 ret = btrfs_create_uuid_tree(fs_info);
3273 if (ret) {
3274 btrfs_warn(fs_info,
3275 "failed to create the UUID tree: %d", ret);
3276 close_ctree(fs_info);
3277 return ret;
3278 }
3279 } else if (btrfs_test_opt(fs_info, RESCAN_UUID_TREE) ||
3280 fs_info->generation !=
3281 btrfs_super_uuid_tree_generation(disk_super)) {
3282 btrfs_info(fs_info, "checking UUID tree");
3283 ret = btrfs_check_uuid_tree(fs_info);
3284 if (ret) {
3285 btrfs_warn(fs_info,
3286 "failed to check the UUID tree: %d", ret);
3287 close_ctree(fs_info);
3288 return ret;
3289 }
3290 } else {
3291 set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
3292 }
3293 set_bit(BTRFS_FS_OPEN, &fs_info->flags);
3294
3295
3296
3297
3298
3299 btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
3300
3301 return 0;
3302
3303fail_qgroup:
3304 btrfs_free_qgroup_config(fs_info);
3305fail_trans_kthread:
3306 kthread_stop(fs_info->transaction_kthread);
3307 btrfs_cleanup_transaction(fs_info);
3308 btrfs_free_fs_roots(fs_info);
3309fail_cleaner:
3310 kthread_stop(fs_info->cleaner_kthread);
3311
3312
3313
3314
3315
3316 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
3317
3318fail_sysfs:
3319 btrfs_sysfs_remove_mounted(fs_info);
3320
3321fail_fsdev_sysfs:
3322 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
3323
3324fail_block_groups:
3325 btrfs_put_block_group_cache(fs_info);
3326
3327fail_tree_roots:
3328 free_root_pointers(fs_info, 1);
3329 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
3330
3331fail_sb_buffer:
3332 btrfs_stop_all_workers(fs_info);
3333 btrfs_free_block_groups(fs_info);
3334fail_alloc:
3335fail_iput:
3336 btrfs_mapping_tree_free(&fs_info->mapping_tree);
3337
3338 iput(fs_info->btree_inode);
3339fail_bio_counter:
3340 percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
3341fail_delalloc_bytes:
3342 percpu_counter_destroy(&fs_info->delalloc_bytes);
3343fail_dirty_metadata_bytes:
3344 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
3345fail_dio_bytes:
3346 percpu_counter_destroy(&fs_info->dio_bytes);
3347fail_srcu:
3348 cleanup_srcu_struct(&fs_info->subvol_srcu);
3349fail:
3350 btrfs_free_stripe_hash_table(fs_info);
3351 btrfs_close_devices(fs_info->fs_devices);
3352 return err;
3353
3354recovery_tree_root:
3355 if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
3356 goto fail_tree_roots;
3357
3358 free_root_pointers(fs_info, 0);
3359
3360
3361 btrfs_set_super_log_root(disk_super, 0);
3362
3363
3364 btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
3365
3366 ret = next_root_backup(fs_info, fs_info->super_copy,
3367 &num_backups_tried, &backup_index);
3368 if (ret == -1)
3369 goto fail_block_groups;
3370 goto retry_root_backup;
3371}
3372ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
3373
3374static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
3375{
3376 if (uptodate) {
3377 set_buffer_uptodate(bh);
3378 } else {
3379 struct btrfs_device *device = (struct btrfs_device *)
3380 bh->b_private;
3381
3382 btrfs_warn_rl_in_rcu(device->fs_info,
3383 "lost page write due to IO error on %s",
3384 rcu_str_deref(device->name));
3385
3386
3387
3388 clear_buffer_uptodate(bh);
3389 btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS);
3390 }
3391 unlock_buffer(bh);
3392 put_bh(bh);
3393}
3394
3395int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
3396 struct buffer_head **bh_ret)
3397{
3398 struct buffer_head *bh;
3399 struct btrfs_super_block *super;
3400 u64 bytenr;
3401
3402 bytenr = btrfs_sb_offset(copy_num);
3403 if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode))
3404 return -EINVAL;
3405
3406 bh = __bread(bdev, bytenr / BTRFS_BDEV_BLOCKSIZE, BTRFS_SUPER_INFO_SIZE);
3407
3408
3409
3410
3411 if (!bh)
3412 return -EIO;
3413
3414 super = (struct btrfs_super_block *)bh->b_data;
3415 if (btrfs_super_bytenr(super) != bytenr ||
3416 btrfs_super_magic(super) != BTRFS_MAGIC) {
3417 brelse(bh);
3418 return -EINVAL;
3419 }
3420
3421 *bh_ret = bh;
3422 return 0;
3423}
3424
3425
3426struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
3427{
3428 struct buffer_head *bh;
3429 struct buffer_head *latest = NULL;
3430 struct btrfs_super_block *super;
3431 int i;
3432 u64 transid = 0;
3433 int ret = -EINVAL;
3434
3435
3436
3437
3438
3439
3440 for (i = 0; i < 1; i++) {
3441 ret = btrfs_read_dev_one_super(bdev, i, &bh);
3442 if (ret)
3443 continue;
3444
3445 super = (struct btrfs_super_block *)bh->b_data;
3446
3447 if (!latest || btrfs_super_generation(super) > transid) {
3448 brelse(latest);
3449 latest = bh;
3450 transid = btrfs_super_generation(super);
3451 } else {
3452 brelse(bh);
3453 }
3454 }
3455
3456 if (!latest)
3457 return ERR_PTR(ret);
3458
3459 return latest;
3460}
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472static int write_dev_supers(struct btrfs_device *device,
3473 struct btrfs_super_block *sb, int max_mirrors)
3474{
3475 struct buffer_head *bh;
3476 int i;
3477 int ret;
3478 int errors = 0;
3479 u32 crc;
3480 u64 bytenr;
3481 int op_flags;
3482
3483 if (max_mirrors == 0)
3484 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
3485
3486 for (i = 0; i < max_mirrors; i++) {
3487 bytenr = btrfs_sb_offset(i);
3488 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
3489 device->commit_total_bytes)
3490 break;
3491
3492 btrfs_set_super_bytenr(sb, bytenr);
3493
3494 crc = ~(u32)0;
3495 crc = btrfs_csum_data((const char *)sb + BTRFS_CSUM_SIZE, crc,
3496 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
3497 btrfs_csum_final(crc, sb->csum);
3498
3499
3500 bh = __getblk(device->bdev, bytenr / BTRFS_BDEV_BLOCKSIZE,
3501 BTRFS_SUPER_INFO_SIZE);
3502 if (!bh) {
3503 btrfs_err(device->fs_info,
3504 "couldn't get super buffer head for bytenr %llu",
3505 bytenr);
3506 errors++;
3507 continue;
3508 }
3509
3510 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
3511
3512
3513 get_bh(bh);
3514
3515 set_buffer_uptodate(bh);
3516 lock_buffer(bh);
3517 bh->b_end_io = btrfs_end_buffer_write_sync;
3518 bh->b_private = device;
3519
3520
3521
3522
3523
3524 op_flags = REQ_SYNC | REQ_META | REQ_PRIO;
3525 if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER))
3526 op_flags |= REQ_FUA;
3527 ret = btrfsic_submit_bh(REQ_OP_WRITE, op_flags, bh);
3528 if (ret)
3529 errors++;
3530 }
3531 return errors < i ? 0 : -1;
3532}
3533
3534
3535
3536
3537
3538
3539
3540
3541static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
3542{
3543 struct buffer_head *bh;
3544 int i;
3545 int errors = 0;
3546 bool primary_failed = false;
3547 u64 bytenr;
3548
3549 if (max_mirrors == 0)
3550 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
3551
3552 for (i = 0; i < max_mirrors; i++) {
3553 bytenr = btrfs_sb_offset(i);
3554 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
3555 device->commit_total_bytes)
3556 break;
3557
3558 bh = __find_get_block(device->bdev,
3559 bytenr / BTRFS_BDEV_BLOCKSIZE,
3560 BTRFS_SUPER_INFO_SIZE);
3561 if (!bh) {
3562 errors++;
3563 if (i == 0)
3564 primary_failed = true;
3565 continue;
3566 }
3567 wait_on_buffer(bh);
3568 if (!buffer_uptodate(bh)) {
3569 errors++;
3570 if (i == 0)
3571 primary_failed = true;
3572 }
3573
3574
3575 brelse(bh);
3576
3577
3578 brelse(bh);
3579 }
3580
3581
3582 if (primary_failed) {
3583 btrfs_err(device->fs_info, "error writing primary super block to device %llu",
3584 device->devid);
3585 return -1;
3586 }
3587
3588 return errors < i ? 0 : -1;
3589}
3590
3591
3592
3593
3594
3595static void btrfs_end_empty_barrier(struct bio *bio)
3596{
3597 complete(bio->bi_private);
3598}
3599
3600
3601
3602
3603
3604static void write_dev_flush(struct btrfs_device *device)
3605{
3606 struct request_queue *q = bdev_get_queue(device->bdev);
3607 struct bio *bio = device->flush_bio;
3608
3609 if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
3610 return;
3611
3612 bio_reset(bio);
3613 bio->bi_end_io = btrfs_end_empty_barrier;
3614 bio_set_dev(bio, device->bdev);
3615 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH;
3616 init_completion(&device->flush_wait);
3617 bio->bi_private = &device->flush_wait;
3618
3619 btrfsic_submit_bio(bio);
3620 set_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
3621}
3622
3623
3624
3625
3626static blk_status_t wait_dev_flush(struct btrfs_device *device)
3627{
3628 struct bio *bio = device->flush_bio;
3629
3630 if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
3631 return BLK_STS_OK;
3632
3633 clear_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
3634 wait_for_completion_io(&device->flush_wait);
3635
3636 return bio->bi_status;
3637}
3638
3639static int check_barrier_error(struct btrfs_fs_info *fs_info)
3640{
3641 if (!btrfs_check_rw_degradable(fs_info, NULL))
3642 return -EIO;
3643 return 0;
3644}
3645
3646
3647
3648
3649
3650static int barrier_all_devices(struct btrfs_fs_info *info)
3651{
3652 struct list_head *head;
3653 struct btrfs_device *dev;
3654 int errors_wait = 0;
3655 blk_status_t ret;
3656
3657 lockdep_assert_held(&info->fs_devices->device_list_mutex);
3658
3659 head = &info->fs_devices->devices;
3660 list_for_each_entry(dev, head, dev_list) {
3661 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
3662 continue;
3663 if (!dev->bdev)
3664 continue;
3665 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3666 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3667 continue;
3668
3669 write_dev_flush(dev);
3670 dev->last_flush_error = BLK_STS_OK;
3671 }
3672
3673
3674 list_for_each_entry(dev, head, dev_list) {
3675 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
3676 continue;
3677 if (!dev->bdev) {
3678 errors_wait++;
3679 continue;
3680 }
3681 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3682 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3683 continue;
3684
3685 ret = wait_dev_flush(dev);
3686 if (ret) {
3687 dev->last_flush_error = ret;
3688 btrfs_dev_stat_inc_and_print(dev,
3689 BTRFS_DEV_STAT_FLUSH_ERRS);
3690 errors_wait++;
3691 }
3692 }
3693
3694 if (errors_wait) {
3695
3696
3697
3698
3699
3700 return check_barrier_error(info);
3701 }
3702 return 0;
3703}
3704
3705int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
3706{
3707 int raid_type;
3708 int min_tolerated = INT_MAX;
3709
3710 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 ||
3711 (flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE))
3712 min_tolerated = min(min_tolerated,
3713 btrfs_raid_array[BTRFS_RAID_SINGLE].
3714 tolerated_failures);
3715
3716 for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
3717 if (raid_type == BTRFS_RAID_SINGLE)
3718 continue;
3719 if (!(flags & btrfs_raid_array[raid_type].bg_flag))
3720 continue;
3721 min_tolerated = min(min_tolerated,
3722 btrfs_raid_array[raid_type].
3723 tolerated_failures);
3724 }
3725
3726 if (min_tolerated == INT_MAX) {
3727 pr_warn("BTRFS: unknown raid flag: %llu", flags);
3728 min_tolerated = 0;
3729 }
3730
3731 return min_tolerated;
3732}
3733
3734int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
3735{
3736 struct list_head *head;
3737 struct btrfs_device *dev;
3738 struct btrfs_super_block *sb;
3739 struct btrfs_dev_item *dev_item;
3740 int ret;
3741 int do_barriers;
3742 int max_errors;
3743 int total_errors = 0;
3744 u64 flags;
3745
3746 do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);
3747
3748
3749
3750
3751
3752
3753 if (max_mirrors == 0)
3754 backup_super_roots(fs_info);
3755
3756 sb = fs_info->super_for_commit;
3757 dev_item = &sb->dev_item;
3758
3759 mutex_lock(&fs_info->fs_devices->device_list_mutex);
3760 head = &fs_info->fs_devices->devices;
3761 max_errors = btrfs_super_num_devices(fs_info->super_copy) - 1;
3762
3763 if (do_barriers) {
3764 ret = barrier_all_devices(fs_info);
3765 if (ret) {
3766 mutex_unlock(
3767 &fs_info->fs_devices->device_list_mutex);
3768 btrfs_handle_fs_error(fs_info, ret,
3769 "errors while submitting device barriers.");
3770 return ret;
3771 }
3772 }
3773
3774 list_for_each_entry(dev, head, dev_list) {
3775 if (!dev->bdev) {
3776 total_errors++;
3777 continue;
3778 }
3779 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3780 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3781 continue;
3782
3783 btrfs_set_stack_device_generation(dev_item, 0);
3784 btrfs_set_stack_device_type(dev_item, dev->type);
3785 btrfs_set_stack_device_id(dev_item, dev->devid);
3786 btrfs_set_stack_device_total_bytes(dev_item,
3787 dev->commit_total_bytes);
3788 btrfs_set_stack_device_bytes_used(dev_item,
3789 dev->commit_bytes_used);
3790 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
3791 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
3792 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
3793 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
3794 memcpy(dev_item->fsid, dev->fs_devices->metadata_uuid,
3795 BTRFS_FSID_SIZE);
3796
3797 flags = btrfs_super_flags(sb);
3798 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
3799
3800 ret = btrfs_validate_write_super(fs_info, sb);
3801 if (ret < 0) {
3802 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3803 btrfs_handle_fs_error(fs_info, -EUCLEAN,
3804 "unexpected superblock corruption detected");
3805 return -EUCLEAN;
3806 }
3807
3808 ret = write_dev_supers(dev, sb, max_mirrors);
3809 if (ret)
3810 total_errors++;
3811 }
3812 if (total_errors > max_errors) {
3813 btrfs_err(fs_info, "%d errors while writing supers",
3814 total_errors);
3815 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3816
3817
3818 btrfs_handle_fs_error(fs_info, -EIO,
3819 "%d errors while writing supers",
3820 total_errors);
3821 return -EIO;
3822 }
3823
3824 total_errors = 0;
3825 list_for_each_entry(dev, head, dev_list) {
3826 if (!dev->bdev)
3827 continue;
3828 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
3829 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
3830 continue;
3831
3832 ret = wait_dev_supers(dev, max_mirrors);
3833 if (ret)
3834 total_errors++;
3835 }
3836 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3837 if (total_errors > max_errors) {
3838 btrfs_handle_fs_error(fs_info, -EIO,
3839 "%d errors while writing supers",
3840 total_errors);
3841 return -EIO;
3842 }
3843 return 0;
3844}
3845
3846
3847void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
3848 struct btrfs_root *root)
3849{
3850 spin_lock(&fs_info->fs_roots_radix_lock);
3851 radix_tree_delete(&fs_info->fs_roots_radix,
3852 (unsigned long)root->root_key.objectid);
3853 spin_unlock(&fs_info->fs_roots_radix_lock);
3854
3855 if (btrfs_root_refs(&root->root_item) == 0)
3856 synchronize_srcu(&fs_info->subvol_srcu);
3857
3858 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
3859 btrfs_free_log(NULL, root);
3860 if (root->reloc_root) {
3861 free_extent_buffer(root->reloc_root->node);
3862 free_extent_buffer(root->reloc_root->commit_root);
3863 btrfs_put_fs_root(root->reloc_root);
3864 root->reloc_root = NULL;
3865 }
3866 }
3867
3868 if (root->free_ino_pinned)
3869 __btrfs_remove_free_space_cache(root->free_ino_pinned);
3870 if (root->free_ino_ctl)
3871 __btrfs_remove_free_space_cache(root->free_ino_ctl);
3872 btrfs_free_fs_root(root);
3873}
3874
3875void btrfs_free_fs_root(struct btrfs_root *root)
3876{
3877 iput(root->ino_cache_inode);
3878 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
3879 if (root->anon_dev)
3880 free_anon_bdev(root->anon_dev);
3881 if (root->subv_writers)
3882 btrfs_free_subvolume_writers(root->subv_writers);
3883 free_extent_buffer(root->node);
3884 free_extent_buffer(root->commit_root);
3885 kfree(root->free_ino_ctl);
3886 kfree(root->free_ino_pinned);
3887 btrfs_put_fs_root(root);
3888}
3889
3890int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
3891{
3892 u64 root_objectid = 0;
3893 struct btrfs_root *gang[8];
3894 int i = 0;
3895 int err = 0;
3896 unsigned int ret = 0;
3897 int index;
3898
3899 while (1) {
3900 index = srcu_read_lock(&fs_info->subvol_srcu);
3901 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
3902 (void **)gang, root_objectid,
3903 ARRAY_SIZE(gang));
3904 if (!ret) {
3905 srcu_read_unlock(&fs_info->subvol_srcu, index);
3906 break;
3907 }
3908 root_objectid = gang[ret - 1]->root_key.objectid + 1;
3909
3910 for (i = 0; i < ret; i++) {
3911
3912 if (btrfs_root_refs(&gang[i]->root_item) == 0) {
3913 gang[i] = NULL;
3914 continue;
3915 }
3916
3917 gang[i] = btrfs_grab_fs_root(gang[i]);
3918 }
3919 srcu_read_unlock(&fs_info->subvol_srcu, index);
3920
3921 for (i = 0; i < ret; i++) {
3922 if (!gang[i])
3923 continue;
3924 root_objectid = gang[i]->root_key.objectid;
3925 err = btrfs_orphan_cleanup(gang[i]);
3926 if (err)
3927 break;
3928 btrfs_put_fs_root(gang[i]);
3929 }
3930 root_objectid++;
3931 }
3932
3933
3934 for (; i < ret; i++) {
3935 if (gang[i])
3936 btrfs_put_fs_root(gang[i]);
3937 }
3938 return err;
3939}
3940
3941int btrfs_commit_super(struct btrfs_fs_info *fs_info)
3942{
3943 struct btrfs_root *root = fs_info->tree_root;
3944 struct btrfs_trans_handle *trans;
3945
3946 mutex_lock(&fs_info->cleaner_mutex);
3947 btrfs_run_delayed_iputs(fs_info);
3948 mutex_unlock(&fs_info->cleaner_mutex);
3949 wake_up_process(fs_info->cleaner_kthread);
3950
3951
3952 down_write(&fs_info->cleanup_work_sem);
3953 up_write(&fs_info->cleanup_work_sem);
3954
3955 trans = btrfs_join_transaction(root);
3956 if (IS_ERR(trans))
3957 return PTR_ERR(trans);
3958 return btrfs_commit_transaction(trans);
3959}
3960
3961void close_ctree(struct btrfs_fs_info *fs_info)
3962{
3963 int ret;
3964
3965 set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
3966
3967
3968
3969
3970
3971
3972 kthread_park(fs_info->cleaner_kthread);
3973
3974
3975 btrfs_qgroup_wait_for_completion(fs_info, false);
3976
3977
3978 down(&fs_info->uuid_tree_rescan_sem);
3979
3980 up(&fs_info->uuid_tree_rescan_sem);
3981
3982
3983 btrfs_pause_balance(fs_info);
3984
3985 btrfs_dev_replace_suspend_for_unmount(fs_info);
3986
3987 btrfs_scrub_cancel(fs_info);
3988
3989
3990 wait_event(fs_info->transaction_wait,
3991 (atomic_read(&fs_info->defrag_running) == 0));
3992
3993
3994 btrfs_cleanup_defrag_inodes(fs_info);
3995
3996 cancel_work_sync(&fs_info->async_reclaim_work);
3997
3998 if (!sb_rdonly(fs_info->sb)) {
3999
4000
4001
4002
4003 btrfs_delete_unused_bgs(fs_info);
4004
4005 ret = btrfs_commit_super(fs_info);
4006 if (ret)
4007 btrfs_err(fs_info, "commit super ret %d", ret);
4008 }
4009
4010 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state) ||
4011 test_bit(BTRFS_FS_STATE_TRANS_ABORTED, &fs_info->fs_state))
4012 btrfs_error_commit_super(fs_info);
4013
4014 kthread_stop(fs_info->transaction_kthread);
4015 kthread_stop(fs_info->cleaner_kthread);
4016
4017 ASSERT(list_empty(&fs_info->delayed_iputs));
4018 set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
4019
4020 btrfs_free_qgroup_config(fs_info);
4021 ASSERT(list_empty(&fs_info->delalloc_roots));
4022
4023 if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
4024 btrfs_info(fs_info, "at unmount delalloc count %lld",
4025 percpu_counter_sum(&fs_info->delalloc_bytes));
4026 }
4027
4028 if (percpu_counter_sum(&fs_info->dio_bytes))
4029 btrfs_info(fs_info, "at unmount dio bytes count %lld",
4030 percpu_counter_sum(&fs_info->dio_bytes));
4031
4032 btrfs_sysfs_remove_mounted(fs_info);
4033 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
4034
4035 btrfs_free_fs_roots(fs_info);
4036
4037 btrfs_put_block_group_cache(fs_info);
4038
4039
4040
4041
4042
4043 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
4044 btrfs_stop_all_workers(fs_info);
4045
4046 btrfs_free_block_groups(fs_info);
4047
4048 clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
4049 free_root_pointers(fs_info, 1);
4050
4051 iput(fs_info->btree_inode);
4052
4053#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4054 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY))
4055 btrfsic_unmount(fs_info->fs_devices);
4056#endif
4057
4058 btrfs_mapping_tree_free(&fs_info->mapping_tree);
4059 btrfs_close_devices(fs_info->fs_devices);
4060
4061 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
4062 percpu_counter_destroy(&fs_info->delalloc_bytes);
4063 percpu_counter_destroy(&fs_info->dio_bytes);
4064 percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
4065 cleanup_srcu_struct(&fs_info->subvol_srcu);
4066
4067 btrfs_free_stripe_hash_table(fs_info);
4068 btrfs_free_ref_cache(fs_info);
4069}
4070
4071int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
4072 int atomic)
4073{
4074 int ret;
4075 struct inode *btree_inode = buf->pages[0]->mapping->host;
4076
4077 ret = extent_buffer_uptodate(buf);
4078 if (!ret)
4079 return ret;
4080
4081 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
4082 parent_transid, atomic);
4083 if (ret == -EAGAIN)
4084 return ret;
4085 return !ret;
4086}
4087
4088void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
4089{
4090 struct btrfs_fs_info *fs_info;
4091 struct btrfs_root *root;
4092 u64 transid = btrfs_header_generation(buf);
4093 int was_dirty;
4094
4095#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4096
4097
4098
4099
4100
4101 if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &buf->bflags)))
4102 return;
4103#endif
4104 root = BTRFS_I(buf->pages[0]->mapping->host)->root;
4105 fs_info = root->fs_info;
4106 btrfs_assert_tree_locked(buf);
4107 if (transid != fs_info->generation)
4108 WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n",
4109 buf->start, transid, fs_info->generation);
4110 was_dirty = set_extent_buffer_dirty(buf);
4111 if (!was_dirty)
4112 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
4113 buf->len,
4114 fs_info->dirty_metadata_batch);
4115#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4116
4117
4118
4119
4120
4121 if (btrfs_header_level(buf) == 0 &&
4122 btrfs_check_leaf_relaxed(buf)) {
4123 btrfs_print_leaf(buf);
4124 ASSERT(0);
4125 }
4126#endif
4127}
4128
4129static void __btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info,
4130 int flush_delayed)
4131{
4132
4133
4134
4135
4136 int ret;
4137
4138 if (current->flags & PF_MEMALLOC)
4139 return;
4140
4141 if (flush_delayed)
4142 btrfs_balance_delayed_items(fs_info);
4143
4144 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
4145 BTRFS_DIRTY_METADATA_THRESH,
4146 fs_info->dirty_metadata_batch);
4147 if (ret > 0) {
4148 balance_dirty_pages_ratelimited(fs_info->btree_inode->i_mapping);
4149 }
4150}
4151
4152void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info)
4153{
4154 __btrfs_btree_balance_dirty(fs_info, 1);
4155}
4156
4157void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info)
4158{
4159 __btrfs_btree_balance_dirty(fs_info, 0);
4160}
4161
4162int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
4163 struct btrfs_key *first_key)
4164{
4165 return btree_read_extent_buffer_pages(buf, parent_transid,
4166 level, first_key);
4167}
4168
4169static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info)
4170{
4171
4172 btrfs_cleanup_transaction(fs_info);
4173
4174 mutex_lock(&fs_info->cleaner_mutex);
4175 btrfs_run_delayed_iputs(fs_info);
4176 mutex_unlock(&fs_info->cleaner_mutex);
4177
4178 down_write(&fs_info->cleanup_work_sem);
4179 up_write(&fs_info->cleanup_work_sem);
4180}
4181
4182static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
4183{
4184 struct btrfs_ordered_extent *ordered;
4185
4186 spin_lock(&root->ordered_extent_lock);
4187
4188
4189
4190
4191 list_for_each_entry(ordered, &root->ordered_extents,
4192 root_extent_list)
4193 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
4194 spin_unlock(&root->ordered_extent_lock);
4195}
4196
4197static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
4198{
4199 struct btrfs_root *root;
4200 struct list_head splice;
4201
4202 INIT_LIST_HEAD(&splice);
4203
4204 spin_lock(&fs_info->ordered_root_lock);
4205 list_splice_init(&fs_info->ordered_roots, &splice);
4206 while (!list_empty(&splice)) {
4207 root = list_first_entry(&splice, struct btrfs_root,
4208 ordered_root);
4209 list_move_tail(&root->ordered_root,
4210 &fs_info->ordered_roots);
4211
4212 spin_unlock(&fs_info->ordered_root_lock);
4213 btrfs_destroy_ordered_extents(root);
4214
4215 cond_resched();
4216 spin_lock(&fs_info->ordered_root_lock);
4217 }
4218 spin_unlock(&fs_info->ordered_root_lock);
4219
4220
4221
4222
4223
4224
4225
4226 btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
4227}
4228
4229static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
4230 struct btrfs_fs_info *fs_info)
4231{
4232 struct rb_node *node;
4233 struct btrfs_delayed_ref_root *delayed_refs;
4234 struct btrfs_delayed_ref_node *ref;
4235 int ret = 0;
4236
4237 delayed_refs = &trans->delayed_refs;
4238
4239 spin_lock(&delayed_refs->lock);
4240 if (atomic_read(&delayed_refs->num_entries) == 0) {
4241 spin_unlock(&delayed_refs->lock);
4242 btrfs_info(fs_info, "delayed_refs has NO entry");
4243 return ret;
4244 }
4245
4246 while ((node = rb_first_cached(&delayed_refs->href_root)) != NULL) {
4247 struct btrfs_delayed_ref_head *head;
4248 struct rb_node *n;
4249 bool pin_bytes = false;
4250
4251 head = rb_entry(node, struct btrfs_delayed_ref_head,
4252 href_node);
4253 if (btrfs_delayed_ref_lock(delayed_refs, head))
4254 continue;
4255
4256 spin_lock(&head->lock);
4257 while ((n = rb_first_cached(&head->ref_tree)) != NULL) {
4258 ref = rb_entry(n, struct btrfs_delayed_ref_node,
4259 ref_node);
4260 ref->in_tree = 0;
4261 rb_erase_cached(&ref->ref_node, &head->ref_tree);
4262 RB_CLEAR_NODE(&ref->ref_node);
4263 if (!list_empty(&ref->add_list))
4264 list_del(&ref->add_list);
4265 atomic_dec(&delayed_refs->num_entries);
4266 btrfs_put_delayed_ref(ref);
4267 }
4268 if (head->must_insert_reserved)
4269 pin_bytes = true;
4270 btrfs_free_delayed_extent_op(head->extent_op);
4271 btrfs_delete_ref_head(delayed_refs, head);
4272 spin_unlock(&head->lock);
4273 spin_unlock(&delayed_refs->lock);
4274 mutex_unlock(&head->mutex);
4275
4276 if (pin_bytes)
4277 btrfs_pin_extent(fs_info, head->bytenr,
4278 head->num_bytes, 1);
4279 btrfs_cleanup_ref_head_accounting(fs_info, delayed_refs, head);
4280 btrfs_put_delayed_ref_head(head);
4281 cond_resched();
4282 spin_lock(&delayed_refs->lock);
4283 }
4284
4285 spin_unlock(&delayed_refs->lock);
4286
4287 return ret;
4288}
4289
4290static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
4291{
4292 struct btrfs_inode *btrfs_inode;
4293 struct list_head splice;
4294
4295 INIT_LIST_HEAD(&splice);
4296
4297 spin_lock(&root->delalloc_lock);
4298 list_splice_init(&root->delalloc_inodes, &splice);
4299
4300 while (!list_empty(&splice)) {
4301 struct inode *inode = NULL;
4302 btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
4303 delalloc_inodes);
4304 __btrfs_del_delalloc_inode(root, btrfs_inode);
4305 spin_unlock(&root->delalloc_lock);
4306
4307
4308
4309
4310
4311 inode = igrab(&btrfs_inode->vfs_inode);
4312 if (inode) {
4313 invalidate_inode_pages2(inode->i_mapping);
4314 iput(inode);
4315 }
4316 spin_lock(&root->delalloc_lock);
4317 }
4318 spin_unlock(&root->delalloc_lock);
4319}
4320
4321static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
4322{
4323 struct btrfs_root *root;
4324 struct list_head splice;
4325
4326 INIT_LIST_HEAD(&splice);
4327
4328 spin_lock(&fs_info->delalloc_root_lock);
4329 list_splice_init(&fs_info->delalloc_roots, &splice);
4330 while (!list_empty(&splice)) {
4331 root = list_first_entry(&splice, struct btrfs_root,
4332 delalloc_root);
4333 root = btrfs_grab_fs_root(root);
4334 BUG_ON(!root);
4335 spin_unlock(&fs_info->delalloc_root_lock);
4336
4337 btrfs_destroy_delalloc_inodes(root);
4338 btrfs_put_fs_root(root);
4339
4340 spin_lock(&fs_info->delalloc_root_lock);
4341 }
4342 spin_unlock(&fs_info->delalloc_root_lock);
4343}
4344
4345static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
4346 struct extent_io_tree *dirty_pages,
4347 int mark)
4348{
4349 int ret;
4350 struct extent_buffer *eb;
4351 u64 start = 0;
4352 u64 end;
4353
4354 while (1) {
4355 ret = find_first_extent_bit(dirty_pages, start, &start, &end,
4356 mark, NULL);
4357 if (ret)
4358 break;
4359
4360 clear_extent_bits(dirty_pages, start, end, mark);
4361 while (start <= end) {
4362 eb = find_extent_buffer(fs_info, start);
4363 start += fs_info->nodesize;
4364 if (!eb)
4365 continue;
4366 wait_on_extent_buffer_writeback(eb);
4367
4368 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
4369 &eb->bflags))
4370 clear_extent_buffer_dirty(eb);
4371 free_extent_buffer_stale(eb);
4372 }
4373 }
4374
4375 return ret;
4376}
4377
4378static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
4379 struct extent_io_tree *pinned_extents)
4380{
4381 struct extent_io_tree *unpin;
4382 u64 start;
4383 u64 end;
4384 int ret;
4385 bool loop = true;
4386
4387 unpin = pinned_extents;
4388again:
4389 while (1) {
4390 struct extent_state *cached_state = NULL;
4391
4392
4393
4394
4395
4396
4397
4398 mutex_lock(&fs_info->unused_bg_unpin_mutex);
4399 ret = find_first_extent_bit(unpin, 0, &start, &end,
4400 EXTENT_DIRTY, &cached_state);
4401 if (ret) {
4402 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
4403 break;
4404 }
4405
4406 clear_extent_dirty(unpin, start, end, &cached_state);
4407 free_extent_state(cached_state);
4408 btrfs_error_unpin_extent_range(fs_info, start, end);
4409 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
4410 cond_resched();
4411 }
4412
4413 if (loop) {
4414 if (unpin == &fs_info->freed_extents[0])
4415 unpin = &fs_info->freed_extents[1];
4416 else
4417 unpin = &fs_info->freed_extents[0];
4418 loop = false;
4419 goto again;
4420 }
4421
4422 return 0;
4423}
4424
4425static void btrfs_cleanup_bg_io(struct btrfs_block_group_cache *cache)
4426{
4427 struct inode *inode;
4428
4429 inode = cache->io_ctl.inode;
4430 if (inode) {
4431 invalidate_inode_pages2(inode->i_mapping);
4432 BTRFS_I(inode)->generation = 0;
4433 cache->io_ctl.inode = NULL;
4434 iput(inode);
4435 }
4436 btrfs_put_block_group(cache);
4437}
4438
4439void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
4440 struct btrfs_fs_info *fs_info)
4441{
4442 struct btrfs_block_group_cache *cache;
4443
4444 spin_lock(&cur_trans->dirty_bgs_lock);
4445 while (!list_empty(&cur_trans->dirty_bgs)) {
4446 cache = list_first_entry(&cur_trans->dirty_bgs,
4447 struct btrfs_block_group_cache,
4448 dirty_list);
4449
4450 if (!list_empty(&cache->io_list)) {
4451 spin_unlock(&cur_trans->dirty_bgs_lock);
4452 list_del_init(&cache->io_list);
4453 btrfs_cleanup_bg_io(cache);
4454 spin_lock(&cur_trans->dirty_bgs_lock);
4455 }
4456
4457 list_del_init(&cache->dirty_list);
4458 spin_lock(&cache->lock);
4459 cache->disk_cache_state = BTRFS_DC_ERROR;
4460 spin_unlock(&cache->lock);
4461
4462 spin_unlock(&cur_trans->dirty_bgs_lock);
4463 btrfs_put_block_group(cache);
4464 btrfs_delayed_refs_rsv_release(fs_info, 1);
4465 spin_lock(&cur_trans->dirty_bgs_lock);
4466 }
4467 spin_unlock(&cur_trans->dirty_bgs_lock);
4468
4469
4470
4471
4472
4473 while (!list_empty(&cur_trans->io_bgs)) {
4474 cache = list_first_entry(&cur_trans->io_bgs,
4475 struct btrfs_block_group_cache,
4476 io_list);
4477
4478 list_del_init(&cache->io_list);
4479 spin_lock(&cache->lock);
4480 cache->disk_cache_state = BTRFS_DC_ERROR;
4481 spin_unlock(&cache->lock);
4482 btrfs_cleanup_bg_io(cache);
4483 }
4484}
4485
4486void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
4487 struct btrfs_fs_info *fs_info)
4488{
4489 struct btrfs_device *dev, *tmp;
4490
4491 btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
4492 ASSERT(list_empty(&cur_trans->dirty_bgs));
4493 ASSERT(list_empty(&cur_trans->io_bgs));
4494
4495 list_for_each_entry_safe(dev, tmp, &cur_trans->dev_update_list,
4496 post_commit_list) {
4497 list_del_init(&dev->post_commit_list);
4498 }
4499
4500 btrfs_destroy_delayed_refs(cur_trans, fs_info);
4501
4502 cur_trans->state = TRANS_STATE_COMMIT_START;
4503 wake_up(&fs_info->transaction_blocked_wait);
4504
4505 cur_trans->state = TRANS_STATE_UNBLOCKED;
4506 wake_up(&fs_info->transaction_wait);
4507
4508 btrfs_destroy_delayed_inodes(fs_info);
4509 btrfs_assert_delayed_root_empty(fs_info);
4510
4511 btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
4512 EXTENT_DIRTY);
4513 btrfs_destroy_pinned_extent(fs_info,
4514 fs_info->pinned_extents);
4515
4516 cur_trans->state =TRANS_STATE_COMPLETED;
4517 wake_up(&cur_trans->commit_wait);
4518}
4519
4520static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
4521{
4522 struct btrfs_transaction *t;
4523
4524 mutex_lock(&fs_info->transaction_kthread_mutex);
4525
4526 spin_lock(&fs_info->trans_lock);
4527 while (!list_empty(&fs_info->trans_list)) {
4528 t = list_first_entry(&fs_info->trans_list,
4529 struct btrfs_transaction, list);
4530 if (t->state >= TRANS_STATE_COMMIT_START) {
4531 refcount_inc(&t->use_count);
4532 spin_unlock(&fs_info->trans_lock);
4533 btrfs_wait_for_commit(fs_info, t->transid);
4534 btrfs_put_transaction(t);
4535 spin_lock(&fs_info->trans_lock);
4536 continue;
4537 }
4538 if (t == fs_info->running_transaction) {
4539 t->state = TRANS_STATE_COMMIT_DOING;
4540 spin_unlock(&fs_info->trans_lock);
4541
4542
4543
4544
4545 wait_event(t->writer_wait,
4546 atomic_read(&t->num_writers) == 0);
4547 } else {
4548 spin_unlock(&fs_info->trans_lock);
4549 }
4550 btrfs_cleanup_one_transaction(t, fs_info);
4551
4552 spin_lock(&fs_info->trans_lock);
4553 if (t == fs_info->running_transaction)
4554 fs_info->running_transaction = NULL;
4555 list_del_init(&t->list);
4556 spin_unlock(&fs_info->trans_lock);
4557
4558 btrfs_put_transaction(t);
4559 trace_btrfs_transaction_commit(fs_info->tree_root);
4560 spin_lock(&fs_info->trans_lock);
4561 }
4562 spin_unlock(&fs_info->trans_lock);
4563 btrfs_destroy_all_ordered_extents(fs_info);
4564 btrfs_destroy_delayed_inodes(fs_info);
4565 btrfs_assert_delayed_root_empty(fs_info);
4566 btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
4567 btrfs_destroy_all_delalloc_inodes(fs_info);
4568 mutex_unlock(&fs_info->transaction_kthread_mutex);
4569
4570 return 0;
4571}
4572
4573static const struct extent_io_ops btree_extent_io_ops = {
4574
4575 .submit_bio_hook = btree_submit_bio_hook,
4576 .readpage_end_io_hook = btree_readpage_end_io_hook,
4577};
4578