2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
20 #include <linux/blkdev.h>
21 #include <linux/scatterlist.h>
22 #include <linux/swap.h>
23 #include <linux/radix-tree.h>
24 #include <linux/writeback.h>
25 #include <linux/buffer_head.h>
26 #include <linux/workqueue.h>
27 #include <linux/kthread.h>
28 #include <linux/freezer.h>
29 #include <linux/slab.h>
30 #include <linux/migrate.h>
31 #include <linux/ratelimit.h>
32 #include <linux/uuid.h>
33 #include <linux/semaphore.h>
34 #include <asm/unaligned.h>
38 #include "transaction.h"
39 #include "btrfs_inode.h"
41 #include "print-tree.h"
44 #include "free-space-cache.h"
45 #include "inode-map.h"
46 #include "check-integrity.h"
47 #include "rcu-string.h"
48 #include "dev-replace.h"
54 #include <asm/cpufeature.h>
57 static const struct extent_io_ops btree_extent_io_ops
;
58 static void end_workqueue_fn(struct btrfs_work
*work
);
59 static void free_fs_root(struct btrfs_root
*root
);
60 static int btrfs_check_super_valid(struct btrfs_fs_info
*fs_info
,
62 static void btrfs_destroy_ordered_extents(struct btrfs_root
*root
);
63 static int btrfs_destroy_delayed_refs(struct btrfs_transaction
*trans
,
64 struct btrfs_root
*root
);
65 static void btrfs_destroy_delalloc_inodes(struct btrfs_root
*root
);
66 static int btrfs_destroy_marked_extents(struct btrfs_root
*root
,
67 struct extent_io_tree
*dirty_pages
,
69 static int btrfs_destroy_pinned_extent(struct btrfs_root
*root
,
70 struct extent_io_tree
*pinned_extents
);
71 static int btrfs_cleanup_transaction(struct btrfs_root
*root
);
72 static void btrfs_error_commit_super(struct btrfs_root
*root
);
75 * btrfs_end_io_wq structs are used to do processing in task context when an IO
76 * is complete. This is used during reads to verify checksums, and it is used
77 * by writes to insert metadata for new file extents after IO is complete.
79 struct btrfs_end_io_wq
{
83 struct btrfs_fs_info
*info
;
85 enum btrfs_wq_endio_type metadata
;
86 struct list_head list
;
87 struct btrfs_work work
;
90 static struct kmem_cache
*btrfs_end_io_wq_cache
;
92 int __init
btrfs_end_io_wq_init(void)
94 btrfs_end_io_wq_cache
= kmem_cache_create("btrfs_end_io_wq",
95 sizeof(struct btrfs_end_io_wq
),
97 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
,
99 if (!btrfs_end_io_wq_cache
)
104 void btrfs_end_io_wq_exit(void)
106 if (btrfs_end_io_wq_cache
)
107 kmem_cache_destroy(btrfs_end_io_wq_cache
);
111 * async submit bios are used to offload expensive checksumming
112 * onto the worker threads. They checksum file and metadata bios
113 * just before they are sent down the IO stack.
115 struct async_submit_bio
{
118 struct list_head list
;
119 extent_submit_bio_hook_t
*submit_bio_start
;
120 extent_submit_bio_hook_t
*submit_bio_done
;
123 unsigned long bio_flags
;
125 * bio_offset is optional, can be used if the pages in the bio
126 * can't tell us where in the file the bio should go
129 struct btrfs_work work
;
134 * Lockdep class keys for extent_buffer->lock's in this root. For a given
135 * eb, the lockdep key is determined by the btrfs_root it belongs to and
136 * the level the eb occupies in the tree.
138 * Different roots are used for different purposes and may nest inside each
139 * other and they require separate keysets. As lockdep keys should be
140 * static, assign keysets according to the purpose of the root as indicated
141 * by btrfs_root->objectid. This ensures that all special purpose roots
142 * have separate keysets.
144 * Lock-nesting across peer nodes is always done with the immediate parent
145 * node locked thus preventing deadlock. As lockdep doesn't know this, use
146 * subclass to avoid triggering lockdep warning in such cases.
148 * The key is set by the readpage_end_io_hook after the buffer has passed
149 * csum validation but before the pages are unlocked. It is also set by
150 * btrfs_init_new_buffer on freshly allocated blocks.
152 * We also add a check to make sure the highest level of the tree is the
153 * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code
154 * needs update as well.
156 #ifdef CONFIG_DEBUG_LOCK_ALLOC
157 # if BTRFS_MAX_LEVEL != 8
161 static struct btrfs_lockdep_keyset
{
162 u64 id
; /* root objectid */
163 const char *name_stem
; /* lock name stem */
164 char names
[BTRFS_MAX_LEVEL
+ 1][20];
165 struct lock_class_key keys
[BTRFS_MAX_LEVEL
+ 1];
166 } btrfs_lockdep_keysets
[] = {
167 { .id
= BTRFS_ROOT_TREE_OBJECTID
, .name_stem
= "root" },
168 { .id
= BTRFS_EXTENT_TREE_OBJECTID
, .name_stem
= "extent" },
169 { .id
= BTRFS_CHUNK_TREE_OBJECTID
, .name_stem
= "chunk" },
170 { .id
= BTRFS_DEV_TREE_OBJECTID
, .name_stem
= "dev" },
171 { .id
= BTRFS_FS_TREE_OBJECTID
, .name_stem
= "fs" },
172 { .id
= BTRFS_CSUM_TREE_OBJECTID
, .name_stem
= "csum" },
173 { .id
= BTRFS_QUOTA_TREE_OBJECTID
, .name_stem
= "quota" },
174 { .id
= BTRFS_TREE_LOG_OBJECTID
, .name_stem
= "log" },
175 { .id
= BTRFS_TREE_RELOC_OBJECTID
, .name_stem
= "treloc" },
176 { .id
= BTRFS_DATA_RELOC_TREE_OBJECTID
, .name_stem
= "dreloc" },
177 { .id
= BTRFS_UUID_TREE_OBJECTID
, .name_stem
= "uuid" },
178 { .id
= 0, .name_stem
= "tree" },
181 void __init
btrfs_init_lockdep(void)
185 /* initialize lockdep class names */
186 for (i
= 0; i
< ARRAY_SIZE(btrfs_lockdep_keysets
); i
++) {
187 struct btrfs_lockdep_keyset
*ks
= &btrfs_lockdep_keysets
[i
];
189 for (j
= 0; j
< ARRAY_SIZE(ks
->names
); j
++)
190 snprintf(ks
->names
[j
], sizeof(ks
->names
[j
]),
191 "btrfs-%s-%02d", ks
->name_stem
, j
);
195 void btrfs_set_buffer_lockdep_class(u64 objectid
, struct extent_buffer
*eb
,
198 struct btrfs_lockdep_keyset
*ks
;
200 BUG_ON(level
>= ARRAY_SIZE(ks
->keys
));
202 /* find the matching keyset, id 0 is the default entry */
203 for (ks
= btrfs_lockdep_keysets
; ks
->id
; ks
++)
204 if (ks
->id
== objectid
)
207 lockdep_set_class_and_name(&eb
->lock
,
208 &ks
->keys
[level
], ks
->names
[level
]);
214 * extents on the btree inode are pretty simple, there's one extent
215 * that covers the entire device
217 static struct extent_map
*btree_get_extent(struct inode
*inode
,
218 struct page
*page
, size_t pg_offset
, u64 start
, u64 len
,
221 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
222 struct extent_map
*em
;
225 read_lock(&em_tree
->lock
);
226 em
= lookup_extent_mapping(em_tree
, start
, len
);
229 BTRFS_I(inode
)->root
->fs_info
->fs_devices
->latest_bdev
;
230 read_unlock(&em_tree
->lock
);
233 read_unlock(&em_tree
->lock
);
235 em
= alloc_extent_map();
237 em
= ERR_PTR(-ENOMEM
);
242 em
->block_len
= (u64
)-1;
244 em
->bdev
= BTRFS_I(inode
)->root
->fs_info
->fs_devices
->latest_bdev
;
246 write_lock(&em_tree
->lock
);
247 ret
= add_extent_mapping(em_tree
, em
, 0);
248 if (ret
== -EEXIST
) {
250 em
= lookup_extent_mapping(em_tree
, start
, len
);
257 write_unlock(&em_tree
->lock
);
263 u32
btrfs_csum_data(char *data
, u32 seed
, size_t len
)
265 return btrfs_crc32c(seed
, data
, len
);
268 void btrfs_csum_final(u32 crc
, char *result
)
270 put_unaligned_le32(~crc
, result
);
274 * compute the csum for a btree block, and either verify it or write it
275 * into the csum field of the block.
277 static int csum_tree_block(struct btrfs_fs_info
*fs_info
,
278 struct extent_buffer
*buf
,
281 u16 csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
284 unsigned long cur_len
;
285 unsigned long offset
= BTRFS_CSUM_SIZE
;
287 unsigned long map_start
;
288 unsigned long map_len
;
291 unsigned long inline_result
;
293 len
= buf
->len
- offset
;
295 err
= map_private_extent_buffer(buf
, offset
, 32,
296 &kaddr
, &map_start
, &map_len
);
299 cur_len
= min(len
, map_len
- (offset
- map_start
));
300 crc
= btrfs_csum_data(kaddr
+ offset
- map_start
,
305 if (csum_size
> sizeof(inline_result
)) {
306 result
= kzalloc(csum_size
, GFP_NOFS
);
310 result
= (char *)&inline_result
;
313 btrfs_csum_final(crc
, result
);
316 if (memcmp_extent_buffer(buf
, result
, 0, csum_size
)) {
319 memcpy(&found
, result
, csum_size
);
321 read_extent_buffer(buf
, &val
, 0, csum_size
);
322 btrfs_warn_rl(fs_info
,
323 "%s checksum verify failed on %llu wanted %X found %X "
325 fs_info
->sb
->s_id
, buf
->start
,
326 val
, found
, btrfs_header_level(buf
));
327 if (result
!= (char *)&inline_result
)
332 write_extent_buffer(buf
, result
, 0, csum_size
);
334 if (result
!= (char *)&inline_result
)
340 * we can't consider a given block up to date unless the transid of the
341 * block matches the transid in the parent node's pointer. This is how we
342 * detect blocks that either didn't get written at all or got written
343 * in the wrong place.
345 static int verify_parent_transid(struct extent_io_tree
*io_tree
,
346 struct extent_buffer
*eb
, u64 parent_transid
,
349 struct extent_state
*cached_state
= NULL
;
351 bool need_lock
= (current
->journal_info
== BTRFS_SEND_TRANS_STUB
);
353 if (!parent_transid
|| btrfs_header_generation(eb
) == parent_transid
)
360 btrfs_tree_read_lock(eb
);
361 btrfs_set_lock_blocking_rw(eb
, BTRFS_READ_LOCK
);
364 lock_extent_bits(io_tree
, eb
->start
, eb
->start
+ eb
->len
- 1,
366 if (extent_buffer_uptodate(eb
) &&
367 btrfs_header_generation(eb
) == parent_transid
) {
371 btrfs_err_rl(eb
->fs_info
,
372 "parent transid verify failed on %llu wanted %llu found %llu",
374 parent_transid
, btrfs_header_generation(eb
));
378 * Things reading via commit roots that don't have normal protection,
379 * like send, can have a really old block in cache that may point at a
380 * block that has been free'd and re-allocated. So don't clear uptodate
381 * if we find an eb that is under IO (dirty/writeback) because we could
382 * end up reading in the stale data and then writing it back out and
383 * making everybody very sad.
385 if (!extent_buffer_under_io(eb
))
386 clear_extent_buffer_uptodate(eb
);
388 unlock_extent_cached(io_tree
, eb
->start
, eb
->start
+ eb
->len
- 1,
389 &cached_state
, GFP_NOFS
);
391 btrfs_tree_read_unlock_blocking(eb
);
396 * Return 0 if the superblock checksum type matches the checksum value of that
397 * algorithm. Pass the raw disk superblock data.
399 static int btrfs_check_super_csum(char *raw_disk_sb
)
401 struct btrfs_super_block
*disk_sb
=
402 (struct btrfs_super_block
*)raw_disk_sb
;
403 u16 csum_type
= btrfs_super_csum_type(disk_sb
);
406 if (csum_type
== BTRFS_CSUM_TYPE_CRC32
) {
408 const int csum_size
= sizeof(crc
);
409 char result
[csum_size
];
412 * The super_block structure does not span the whole
413 * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space
414 * is filled with zeros and is included in the checkum.
416 crc
= btrfs_csum_data(raw_disk_sb
+ BTRFS_CSUM_SIZE
,
417 crc
, BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
);
418 btrfs_csum_final(crc
, result
);
420 if (memcmp(raw_disk_sb
, result
, csum_size
))
424 if (csum_type
>= ARRAY_SIZE(btrfs_csum_sizes
)) {
425 printk(KERN_ERR
"BTRFS: unsupported checksum algorithm %u\n",
434 * helper to read a given tree block, doing retries as required when
435 * the checksums don't match and we have alternate mirrors to try.
437 static int btree_read_extent_buffer_pages(struct btrfs_root
*root
,
438 struct extent_buffer
*eb
,
439 u64 start
, u64 parent_transid
)
441 struct extent_io_tree
*io_tree
;
446 int failed_mirror
= 0;
448 clear_bit(EXTENT_BUFFER_CORRUPT
, &eb
->bflags
);
449 io_tree
= &BTRFS_I(root
->fs_info
->btree_inode
)->io_tree
;
451 ret
= read_extent_buffer_pages(io_tree
, eb
, start
,
453 btree_get_extent
, mirror_num
);
455 if (!verify_parent_transid(io_tree
, eb
,
463 * This buffer's crc is fine, but its contents are corrupted, so
464 * there is no reason to read the other copies, they won't be
467 if (test_bit(EXTENT_BUFFER_CORRUPT
, &eb
->bflags
))
470 num_copies
= btrfs_num_copies(root
->fs_info
,
475 if (!failed_mirror
) {
477 failed_mirror
= eb
->read_mirror
;
481 if (mirror_num
== failed_mirror
)
484 if (mirror_num
> num_copies
)
488 if (failed
&& !ret
&& failed_mirror
)
489 repair_eb_io_failure(root
, eb
, failed_mirror
);
495 * checksum a dirty tree block before IO. This has extra checks to make sure
496 * we only fill in the checksum field in the first page of a multi-page block
499 static int csum_dirty_buffer(struct btrfs_fs_info
*fs_info
, struct page
*page
)
501 u64 start
= page_offset(page
);
503 struct extent_buffer
*eb
;
505 eb
= (struct extent_buffer
*)page
->private;
506 if (page
!= eb
->pages
[0])
508 found_start
= btrfs_header_bytenr(eb
);
509 if (WARN_ON(found_start
!= start
|| !PageUptodate(page
)))
511 csum_tree_block(fs_info
, eb
, 0);
515 static int check_tree_block_fsid(struct btrfs_fs_info
*fs_info
,
516 struct extent_buffer
*eb
)
518 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
519 u8 fsid
[BTRFS_UUID_SIZE
];
522 read_extent_buffer(eb
, fsid
, btrfs_header_fsid(), BTRFS_FSID_SIZE
);
524 if (!memcmp(fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
)) {
528 fs_devices
= fs_devices
->seed
;
533 #define CORRUPT(reason, eb, root, slot) \
534 btrfs_crit(root->fs_info, "corrupt leaf, %s: block=%llu," \
535 "root=%llu, slot=%d", reason, \
536 btrfs_header_bytenr(eb), root->objectid, slot)
538 static noinline
int check_leaf(struct btrfs_root
*root
,
539 struct extent_buffer
*leaf
)
541 struct btrfs_key key
;
542 struct btrfs_key leaf_key
;
543 u32 nritems
= btrfs_header_nritems(leaf
);
549 /* Check the 0 item */
550 if (btrfs_item_offset_nr(leaf
, 0) + btrfs_item_size_nr(leaf
, 0) !=
551 BTRFS_LEAF_DATA_SIZE(root
)) {
552 CORRUPT("invalid item offset size pair", leaf
, root
, 0);
557 * Check to make sure each items keys are in the correct order and their
558 * offsets make sense. We only have to loop through nritems-1 because
559 * we check the current slot against the next slot, which verifies the
560 * next slot's offset+size makes sense and that the current's slot
563 for (slot
= 0; slot
< nritems
- 1; slot
++) {
564 btrfs_item_key_to_cpu(leaf
, &leaf_key
, slot
);
565 btrfs_item_key_to_cpu(leaf
, &key
, slot
+ 1);
567 /* Make sure the keys are in the right order */
568 if (btrfs_comp_cpu_keys(&leaf_key
, &key
) >= 0) {
569 CORRUPT("bad key order", leaf
, root
, slot
);
574 * Make sure the offset and ends are right, remember that the
575 * item data starts at the end of the leaf and grows towards the
578 if (btrfs_item_offset_nr(leaf
, slot
) !=
579 btrfs_item_end_nr(leaf
, slot
+ 1)) {
580 CORRUPT("slot offset bad", leaf
, root
, slot
);
585 * Check to make sure that we don't point outside of the leaf,
586 * just incase all the items are consistent to eachother, but
587 * all point outside of the leaf.
589 if (btrfs_item_end_nr(leaf
, slot
) >
590 BTRFS_LEAF_DATA_SIZE(root
)) {
591 CORRUPT("slot end outside of leaf", leaf
, root
, slot
);
599 static int btree_readpage_end_io_hook(struct btrfs_io_bio
*io_bio
,
600 u64 phy_offset
, struct page
*page
,
601 u64 start
, u64 end
, int mirror
)
605 struct extent_buffer
*eb
;
606 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
613 eb
= (struct extent_buffer
*)page
->private;
615 /* the pending IO might have been the only thing that kept this buffer
616 * in memory. Make sure we have a ref for all this other checks
618 extent_buffer_get(eb
);
620 reads_done
= atomic_dec_and_test(&eb
->io_pages
);
624 eb
->read_mirror
= mirror
;
625 if (test_bit(EXTENT_BUFFER_READ_ERR
, &eb
->bflags
)) {
630 found_start
= btrfs_header_bytenr(eb
);
631 if (found_start
!= eb
->start
) {
632 btrfs_err_rl(eb
->fs_info
, "bad tree block start %llu %llu",
633 found_start
, eb
->start
);
637 if (check_tree_block_fsid(root
->fs_info
, eb
)) {
638 btrfs_err_rl(eb
->fs_info
, "bad fsid on block %llu",
643 found_level
= btrfs_header_level(eb
);
644 if (found_level
>= BTRFS_MAX_LEVEL
) {
645 btrfs_err(root
->fs_info
, "bad tree block level %d",
646 (int)btrfs_header_level(eb
));
651 btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb
),
654 ret
= csum_tree_block(root
->fs_info
, eb
, 1);
661 * If this is a leaf block and it is corrupt, set the corrupt bit so
662 * that we don't try and read the other copies of this block, just
665 if (found_level
== 0 && check_leaf(root
, eb
)) {
666 set_bit(EXTENT_BUFFER_CORRUPT
, &eb
->bflags
);
671 set_extent_buffer_uptodate(eb
);
674 test_and_clear_bit(EXTENT_BUFFER_READAHEAD
, &eb
->bflags
))
675 btree_readahead_hook(root
, eb
, eb
->start
, ret
);
679 * our io error hook is going to dec the io pages
680 * again, we have to make sure it has something
683 atomic_inc(&eb
->io_pages
);
684 clear_extent_buffer_uptodate(eb
);
686 free_extent_buffer(eb
);
691 static int btree_io_failed_hook(struct page
*page
, int failed_mirror
)
693 struct extent_buffer
*eb
;
694 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
696 eb
= (struct extent_buffer
*)page
->private;
697 set_bit(EXTENT_BUFFER_READ_ERR
, &eb
->bflags
);
698 eb
->read_mirror
= failed_mirror
;
699 atomic_dec(&eb
->io_pages
);
700 if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD
, &eb
->bflags
))
701 btree_readahead_hook(root
, eb
, eb
->start
, -EIO
);
702 return -EIO
; /* we fixed nothing */
705 static void end_workqueue_bio(struct bio
*bio
)
707 struct btrfs_end_io_wq
*end_io_wq
= bio
->bi_private
;
708 struct btrfs_fs_info
*fs_info
;
709 struct btrfs_workqueue
*wq
;
710 btrfs_work_func_t func
;
712 fs_info
= end_io_wq
->info
;
713 end_io_wq
->error
= bio
->bi_error
;
715 if (bio
->bi_rw
& REQ_WRITE
) {
716 if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_METADATA
) {
717 wq
= fs_info
->endio_meta_write_workers
;
718 func
= btrfs_endio_meta_write_helper
;
719 } else if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_FREE_SPACE
) {
720 wq
= fs_info
->endio_freespace_worker
;
721 func
= btrfs_freespace_write_helper
;
722 } else if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_RAID56
) {
723 wq
= fs_info
->endio_raid56_workers
;
724 func
= btrfs_endio_raid56_helper
;
726 wq
= fs_info
->endio_write_workers
;
727 func
= btrfs_endio_write_helper
;
730 if (unlikely(end_io_wq
->metadata
==
731 BTRFS_WQ_ENDIO_DIO_REPAIR
)) {
732 wq
= fs_info
->endio_repair_workers
;
733 func
= btrfs_endio_repair_helper
;
734 } else if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_RAID56
) {
735 wq
= fs_info
->endio_raid56_workers
;
736 func
= btrfs_endio_raid56_helper
;
737 } else if (end_io_wq
->metadata
) {
738 wq
= fs_info
->endio_meta_workers
;
739 func
= btrfs_endio_meta_helper
;
741 wq
= fs_info
->endio_workers
;
742 func
= btrfs_endio_helper
;
746 btrfs_init_work(&end_io_wq
->work
, func
, end_workqueue_fn
, NULL
, NULL
);
747 btrfs_queue_work(wq
, &end_io_wq
->work
);
750 int btrfs_bio_wq_end_io(struct btrfs_fs_info
*info
, struct bio
*bio
,
751 enum btrfs_wq_endio_type metadata
)
753 struct btrfs_end_io_wq
*end_io_wq
;
755 end_io_wq
= kmem_cache_alloc(btrfs_end_io_wq_cache
, GFP_NOFS
);
759 end_io_wq
->private = bio
->bi_private
;
760 end_io_wq
->end_io
= bio
->bi_end_io
;
761 end_io_wq
->info
= info
;
762 end_io_wq
->error
= 0;
763 end_io_wq
->bio
= bio
;
764 end_io_wq
->metadata
= metadata
;
766 bio
->bi_private
= end_io_wq
;
767 bio
->bi_end_io
= end_workqueue_bio
;
771 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info
*info
)
773 unsigned long limit
= min_t(unsigned long,
774 info
->thread_pool_size
,
775 info
->fs_devices
->open_devices
);
779 static void run_one_async_start(struct btrfs_work
*work
)
781 struct async_submit_bio
*async
;
784 async
= container_of(work
, struct async_submit_bio
, work
);
785 ret
= async
->submit_bio_start(async
->inode
, async
->rw
, async
->bio
,
786 async
->mirror_num
, async
->bio_flags
,
792 static void run_one_async_done(struct btrfs_work
*work
)
794 struct btrfs_fs_info
*fs_info
;
795 struct async_submit_bio
*async
;
798 async
= container_of(work
, struct async_submit_bio
, work
);
799 fs_info
= BTRFS_I(async
->inode
)->root
->fs_info
;
801 limit
= btrfs_async_submit_limit(fs_info
);
802 limit
= limit
* 2 / 3;
804 if (atomic_dec_return(&fs_info
->nr_async_submits
) < limit
&&
805 waitqueue_active(&fs_info
->async_submit_wait
))
806 wake_up(&fs_info
->async_submit_wait
);
808 /* If an error occured we just want to clean up the bio and move on */
810 async
->bio
->bi_error
= async
->error
;
811 bio_endio(async
->bio
);
815 async
->submit_bio_done(async
->inode
, async
->rw
, async
->bio
,
816 async
->mirror_num
, async
->bio_flags
,
820 static void run_one_async_free(struct btrfs_work
*work
)
822 struct async_submit_bio
*async
;
824 async
= container_of(work
, struct async_submit_bio
, work
);
828 int btrfs_wq_submit_bio(struct btrfs_fs_info
*fs_info
, struct inode
*inode
,
829 int rw
, struct bio
*bio
, int mirror_num
,
830 unsigned long bio_flags
,
832 extent_submit_bio_hook_t
*submit_bio_start
,
833 extent_submit_bio_hook_t
*submit_bio_done
)
835 struct async_submit_bio
*async
;
837 async
= kmalloc(sizeof(*async
), GFP_NOFS
);
841 async
->inode
= inode
;
844 async
->mirror_num
= mirror_num
;
845 async
->submit_bio_start
= submit_bio_start
;
846 async
->submit_bio_done
= submit_bio_done
;
848 btrfs_init_work(&async
->work
, btrfs_worker_helper
, run_one_async_start
,
849 run_one_async_done
, run_one_async_free
);
851 async
->bio_flags
= bio_flags
;
852 async
->bio_offset
= bio_offset
;
856 atomic_inc(&fs_info
->nr_async_submits
);
859 btrfs_set_work_high_priority(&async
->work
);
861 btrfs_queue_work(fs_info
->workers
, &async
->work
);
863 while (atomic_read(&fs_info
->async_submit_draining
) &&
864 atomic_read(&fs_info
->nr_async_submits
)) {
865 wait_event(fs_info
->async_submit_wait
,
866 (atomic_read(&fs_info
->nr_async_submits
) == 0));
872 static int btree_csum_one_bio(struct bio
*bio
)
874 struct bio_vec
*bvec
;
875 struct btrfs_root
*root
;
878 bio_for_each_segment_all(bvec
, bio
, i
) {
879 root
= BTRFS_I(bvec
->bv_page
->mapping
->host
)->root
;
880 ret
= csum_dirty_buffer(root
->fs_info
, bvec
->bv_page
);
888 static int __btree_submit_bio_start(struct inode
*inode
, int rw
,
889 struct bio
*bio
, int mirror_num
,
890 unsigned long bio_flags
,
894 * when we're called for a write, we're already in the async
895 * submission context. Just jump into btrfs_map_bio
897 return btree_csum_one_bio(bio
);
900 static int __btree_submit_bio_done(struct inode
*inode
, int rw
, struct bio
*bio
,
901 int mirror_num
, unsigned long bio_flags
,
907 * when we're called for a write, we're already in the async
908 * submission context. Just jump into btrfs_map_bio
910 ret
= btrfs_map_bio(BTRFS_I(inode
)->root
, rw
, bio
, mirror_num
, 1);
918 static int check_async_write(struct inode
*inode
, unsigned long bio_flags
)
920 if (bio_flags
& EXTENT_BIO_TREE_LOG
)
929 static int btree_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
,
930 int mirror_num
, unsigned long bio_flags
,
933 int async
= check_async_write(inode
, bio_flags
);
936 if (!(rw
& REQ_WRITE
)) {
938 * called for a read, do the setup so that checksum validation
939 * can happen in the async kernel threads
941 ret
= btrfs_bio_wq_end_io(BTRFS_I(inode
)->root
->fs_info
,
942 bio
, BTRFS_WQ_ENDIO_METADATA
);
945 ret
= btrfs_map_bio(BTRFS_I(inode
)->root
, rw
, bio
,
948 ret
= btree_csum_one_bio(bio
);
951 ret
= btrfs_map_bio(BTRFS_I(inode
)->root
, rw
, bio
,
955 * kthread helpers are used to submit writes so that
956 * checksumming can happen in parallel across all CPUs
958 ret
= btrfs_wq_submit_bio(BTRFS_I(inode
)->root
->fs_info
,
959 inode
, rw
, bio
, mirror_num
, 0,
961 __btree_submit_bio_start
,
962 __btree_submit_bio_done
);
975 #ifdef CONFIG_MIGRATION
976 static int btree_migratepage(struct address_space
*mapping
,
977 struct page
*newpage
, struct page
*page
,
978 enum migrate_mode mode
)
981 * we can't safely write a btree page from here,
982 * we haven't done the locking hook
987 * Buffers may be managed in a filesystem specific way.
988 * We must have no buffers or drop them.
990 if (page_has_private(page
) &&
991 !try_to_release_page(page
, GFP_KERNEL
))
993 return migrate_page(mapping
, newpage
, page
, mode
);
998 static int btree_writepages(struct address_space
*mapping
,
999 struct writeback_control
*wbc
)
1001 struct btrfs_fs_info
*fs_info
;
1004 if (wbc
->sync_mode
== WB_SYNC_NONE
) {
1006 if (wbc
->for_kupdate
)
1009 fs_info
= BTRFS_I(mapping
->host
)->root
->fs_info
;
1010 /* this is a bit racy, but that's ok */
1011 ret
= percpu_counter_compare(&fs_info
->dirty_metadata_bytes
,
1012 BTRFS_DIRTY_METADATA_THRESH
);
1016 return btree_write_cache_pages(mapping
, wbc
);
1019 static int btree_readpage(struct file
*file
, struct page
*page
)
1021 struct extent_io_tree
*tree
;
1022 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
1023 return extent_read_full_page(tree
, page
, btree_get_extent
, 0);
1026 static int btree_releasepage(struct page
*page
, gfp_t gfp_flags
)
1028 if (PageWriteback(page
) || PageDirty(page
))
1031 return try_release_extent_buffer(page
);
1034 static void btree_invalidatepage(struct page
*page
, unsigned int offset
,
1035 unsigned int length
)
1037 struct extent_io_tree
*tree
;
1038 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
1039 extent_invalidatepage(tree
, page
, offset
);
1040 btree_releasepage(page
, GFP_NOFS
);
1041 if (PagePrivate(page
)) {
1042 btrfs_warn(BTRFS_I(page
->mapping
->host
)->root
->fs_info
,
1043 "page private not zero on page %llu",
1044 (unsigned long long)page_offset(page
));
1045 ClearPagePrivate(page
);
1046 set_page_private(page
, 0);
1047 page_cache_release(page
);
1051 static int btree_set_page_dirty(struct page
*page
)
1054 struct extent_buffer
*eb
;
1056 BUG_ON(!PagePrivate(page
));
1057 eb
= (struct extent_buffer
*)page
->private;
1059 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY
, &eb
->bflags
));
1060 BUG_ON(!atomic_read(&eb
->refs
));
1061 btrfs_assert_tree_locked(eb
);
1063 return __set_page_dirty_nobuffers(page
);
1066 static const struct address_space_operations btree_aops
= {
1067 .readpage
= btree_readpage
,
1068 .writepages
= btree_writepages
,
1069 .releasepage
= btree_releasepage
,
1070 .invalidatepage
= btree_invalidatepage
,
1071 #ifdef CONFIG_MIGRATION
1072 .migratepage
= btree_migratepage
,
1074 .set_page_dirty
= btree_set_page_dirty
,
1077 void readahead_tree_block(struct btrfs_root
*root
, u64 bytenr
)
1079 struct extent_buffer
*buf
= NULL
;
1080 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
1082 buf
= btrfs_find_create_tree_block(root
, bytenr
);
1085 read_extent_buffer_pages(&BTRFS_I(btree_inode
)->io_tree
,
1086 buf
, 0, WAIT_NONE
, btree_get_extent
, 0);
1087 free_extent_buffer(buf
);
1090 int reada_tree_block_flagged(struct btrfs_root
*root
, u64 bytenr
,
1091 int mirror_num
, struct extent_buffer
**eb
)
1093 struct extent_buffer
*buf
= NULL
;
1094 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
1095 struct extent_io_tree
*io_tree
= &BTRFS_I(btree_inode
)->io_tree
;
1098 buf
= btrfs_find_create_tree_block(root
, bytenr
);
1102 set_bit(EXTENT_BUFFER_READAHEAD
, &buf
->bflags
);
1104 ret
= read_extent_buffer_pages(io_tree
, buf
, 0, WAIT_PAGE_LOCK
,
1105 btree_get_extent
, mirror_num
);
1107 free_extent_buffer(buf
);
1111 if (test_bit(EXTENT_BUFFER_CORRUPT
, &buf
->bflags
)) {
1112 free_extent_buffer(buf
);
1114 } else if (extent_buffer_uptodate(buf
)) {
1117 free_extent_buffer(buf
);
1122 struct extent_buffer
*btrfs_find_tree_block(struct btrfs_fs_info
*fs_info
,
1125 return find_extent_buffer(fs_info
, bytenr
);
1128 struct extent_buffer
*btrfs_find_create_tree_block(struct btrfs_root
*root
,
1131 if (btrfs_test_is_dummy_root(root
))
1132 return alloc_test_extent_buffer(root
->fs_info
, bytenr
);
1133 return alloc_extent_buffer(root
->fs_info
, bytenr
);
1137 int btrfs_write_tree_block(struct extent_buffer
*buf
)
1139 return filemap_fdatawrite_range(buf
->pages
[0]->mapping
, buf
->start
,
1140 buf
->start
+ buf
->len
- 1);
1143 int btrfs_wait_tree_block_writeback(struct extent_buffer
*buf
)
1145 return filemap_fdatawait_range(buf
->pages
[0]->mapping
,
1146 buf
->start
, buf
->start
+ buf
->len
- 1);
1149 struct extent_buffer
*read_tree_block(struct btrfs_root
*root
, u64 bytenr
,
1152 struct extent_buffer
*buf
= NULL
;
1155 buf
= btrfs_find_create_tree_block(root
, bytenr
);
1157 return ERR_PTR(-ENOMEM
);
1159 ret
= btree_read_extent_buffer_pages(root
, buf
, 0, parent_transid
);
1161 free_extent_buffer(buf
);
1162 return ERR_PTR(ret
);
1168 void clean_tree_block(struct btrfs_trans_handle
*trans
,
1169 struct btrfs_fs_info
*fs_info
,
1170 struct extent_buffer
*buf
)
1172 if (btrfs_header_generation(buf
) ==
1173 fs_info
->running_transaction
->transid
) {
1174 btrfs_assert_tree_locked(buf
);
1176 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY
, &buf
->bflags
)) {
1177 __percpu_counter_add(&fs_info
->dirty_metadata_bytes
,
1179 fs_info
->dirty_metadata_batch
);
1180 /* ugh, clear_extent_buffer_dirty needs to lock the page */
1181 btrfs_set_lock_blocking(buf
);
1182 clear_extent_buffer_dirty(buf
);
1187 static struct btrfs_subvolume_writers
*btrfs_alloc_subvolume_writers(void)
1189 struct btrfs_subvolume_writers
*writers
;
1192 writers
= kmalloc(sizeof(*writers
), GFP_NOFS
);
1194 return ERR_PTR(-ENOMEM
);
1196 ret
= percpu_counter_init(&writers
->counter
, 0, GFP_KERNEL
);
1199 return ERR_PTR(ret
);
1202 init_waitqueue_head(&writers
->wait
);
1207 btrfs_free_subvolume_writers(struct btrfs_subvolume_writers
*writers
)
1209 percpu_counter_destroy(&writers
->counter
);
1213 static void __setup_root(u32 nodesize
, u32 sectorsize
, u32 stripesize
,
1214 struct btrfs_root
*root
, struct btrfs_fs_info
*fs_info
,
1218 root
->commit_root
= NULL
;
1219 root
->sectorsize
= sectorsize
;
1220 root
->nodesize
= nodesize
;
1221 root
->stripesize
= stripesize
;
1223 root
->orphan_cleanup_state
= 0;
1225 root
->objectid
= objectid
;
1226 root
->last_trans
= 0;
1227 root
->highest_objectid
= 0;
1228 root
->nr_delalloc_inodes
= 0;
1229 root
->nr_ordered_extents
= 0;
1231 root
->inode_tree
= RB_ROOT
;
1232 INIT_RADIX_TREE(&root
->delayed_nodes_tree
, GFP_ATOMIC
);
1233 root
->block_rsv
= NULL
;
1234 root
->orphan_block_rsv
= NULL
;
1236 INIT_LIST_HEAD(&root
->dirty_list
);
1237 INIT_LIST_HEAD(&root
->root_list
);
1238 INIT_LIST_HEAD(&root
->delalloc_inodes
);
1239 INIT_LIST_HEAD(&root
->delalloc_root
);
1240 INIT_LIST_HEAD(&root
->ordered_extents
);
1241 INIT_LIST_HEAD(&root
->ordered_root
);
1242 INIT_LIST_HEAD(&root
->logged_list
[0]);
1243 INIT_LIST_HEAD(&root
->logged_list
[1]);
1244 spin_lock_init(&root
->orphan_lock
);
1245 spin_lock_init(&root
->inode_lock
);
1246 spin_lock_init(&root
->delalloc_lock
);
1247 spin_lock_init(&root
->ordered_extent_lock
);
1248 spin_lock_init(&root
->accounting_lock
);
1249 spin_lock_init(&root
->log_extents_lock
[0]);
1250 spin_lock_init(&root
->log_extents_lock
[1]);
1251 mutex_init(&root
->objectid_mutex
);
1252 mutex_init(&root
->log_mutex
);
1253 mutex_init(&root
->ordered_extent_mutex
);
1254 mutex_init(&root
->delalloc_mutex
);
1255 init_waitqueue_head(&root
->log_writer_wait
);
1256 init_waitqueue_head(&root
->log_commit_wait
[0]);
1257 init_waitqueue_head(&root
->log_commit_wait
[1]);
1258 INIT_LIST_HEAD(&root
->log_ctxs
[0]);
1259 INIT_LIST_HEAD(&root
->log_ctxs
[1]);
1260 atomic_set(&root
->log_commit
[0], 0);
1261 atomic_set(&root
->log_commit
[1], 0);
1262 atomic_set(&root
->log_writers
, 0);
1263 atomic_set(&root
->log_batch
, 0);
1264 atomic_set(&root
->orphan_inodes
, 0);
1265 atomic_set(&root
->refs
, 1);
1266 atomic_set(&root
->will_be_snapshoted
, 0);
1267 root
->log_transid
= 0;
1268 root
->log_transid_committed
= -1;
1269 root
->last_log_commit
= 0;
1271 extent_io_tree_init(&root
->dirty_log_pages
,
1272 fs_info
->btree_inode
->i_mapping
);
1274 memset(&root
->root_key
, 0, sizeof(root
->root_key
));
1275 memset(&root
->root_item
, 0, sizeof(root
->root_item
));
1276 memset(&root
->defrag_progress
, 0, sizeof(root
->defrag_progress
));
1278 root
->defrag_trans_start
= fs_info
->generation
;
1280 root
->defrag_trans_start
= 0;
1281 root
->root_key
.objectid
= objectid
;
1284 spin_lock_init(&root
->root_item_lock
);
1287 static struct btrfs_root
*btrfs_alloc_root(struct btrfs_fs_info
*fs_info
)
1289 struct btrfs_root
*root
= kzalloc(sizeof(*root
), GFP_NOFS
);
1291 root
->fs_info
= fs_info
;
1295 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1296 /* Should only be used by the testing infrastructure */
1297 struct btrfs_root
*btrfs_alloc_dummy_root(void)
1299 struct btrfs_root
*root
;
1301 root
= btrfs_alloc_root(NULL
);
1303 return ERR_PTR(-ENOMEM
);
1304 __setup_root(4096, 4096, 4096, root
, NULL
, 1);
1305 set_bit(BTRFS_ROOT_DUMMY_ROOT
, &root
->state
);
1306 root
->alloc_bytenr
= 0;
1312 struct btrfs_root
*btrfs_create_tree(struct btrfs_trans_handle
*trans
,
1313 struct btrfs_fs_info
*fs_info
,
1316 struct extent_buffer
*leaf
;
1317 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
1318 struct btrfs_root
*root
;
1319 struct btrfs_key key
;
1323 root
= btrfs_alloc_root(fs_info
);
1325 return ERR_PTR(-ENOMEM
);
1327 __setup_root(tree_root
->nodesize
, tree_root
->sectorsize
,
1328 tree_root
->stripesize
, root
, fs_info
, objectid
);
1329 root
->root_key
.objectid
= objectid
;
1330 root
->root_key
.type
= BTRFS_ROOT_ITEM_KEY
;
1331 root
->root_key
.offset
= 0;
1333 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, objectid
, NULL
, 0, 0, 0);
1335 ret
= PTR_ERR(leaf
);
1340 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
1341 btrfs_set_header_bytenr(leaf
, leaf
->start
);
1342 btrfs_set_header_generation(leaf
, trans
->transid
);
1343 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
1344 btrfs_set_header_owner(leaf
, objectid
);
1347 write_extent_buffer(leaf
, fs_info
->fsid
, btrfs_header_fsid(),
1349 write_extent_buffer(leaf
, fs_info
->chunk_tree_uuid
,
1350 btrfs_header_chunk_tree_uuid(leaf
),
1352 btrfs_mark_buffer_dirty(leaf
);
1354 root
->commit_root
= btrfs_root_node(root
);
1355 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
1357 root
->root_item
.flags
= 0;
1358 root
->root_item
.byte_limit
= 0;
1359 btrfs_set_root_bytenr(&root
->root_item
, leaf
->start
);
1360 btrfs_set_root_generation(&root
->root_item
, trans
->transid
);
1361 btrfs_set_root_level(&root
->root_item
, 0);
1362 btrfs_set_root_refs(&root
->root_item
, 1);
1363 btrfs_set_root_used(&root
->root_item
, leaf
->len
);
1364 btrfs_set_root_last_snapshot(&root
->root_item
, 0);
1365 btrfs_set_root_dirid(&root
->root_item
, 0);
1367 memcpy(root
->root_item
.uuid
, uuid
.b
, BTRFS_UUID_SIZE
);
1368 root
->root_item
.drop_level
= 0;
1370 key
.objectid
= objectid
;
1371 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1373 ret
= btrfs_insert_root(trans
, tree_root
, &key
, &root
->root_item
);
1377 btrfs_tree_unlock(leaf
);
1383 btrfs_tree_unlock(leaf
);
1384 free_extent_buffer(root
->commit_root
);
1385 free_extent_buffer(leaf
);
1389 return ERR_PTR(ret
);
1392 static struct btrfs_root
*alloc_log_tree(struct btrfs_trans_handle
*trans
,
1393 struct btrfs_fs_info
*fs_info
)
1395 struct btrfs_root
*root
;
1396 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
1397 struct extent_buffer
*leaf
;
1399 root
= btrfs_alloc_root(fs_info
);
1401 return ERR_PTR(-ENOMEM
);
1403 __setup_root(tree_root
->nodesize
, tree_root
->sectorsize
,
1404 tree_root
->stripesize
, root
, fs_info
,
1405 BTRFS_TREE_LOG_OBJECTID
);
1407 root
->root_key
.objectid
= BTRFS_TREE_LOG_OBJECTID
;
1408 root
->root_key
.type
= BTRFS_ROOT_ITEM_KEY
;
1409 root
->root_key
.offset
= BTRFS_TREE_LOG_OBJECTID
;
1412 * DON'T set REF_COWS for log trees
1414 * log trees do not get reference counted because they go away
1415 * before a real commit is actually done. They do store pointers
1416 * to file data extents, and those reference counts still get
1417 * updated (along with back refs to the log tree).
1420 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, BTRFS_TREE_LOG_OBJECTID
,
1424 return ERR_CAST(leaf
);
1427 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
1428 btrfs_set_header_bytenr(leaf
, leaf
->start
);
1429 btrfs_set_header_generation(leaf
, trans
->transid
);
1430 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
1431 btrfs_set_header_owner(leaf
, BTRFS_TREE_LOG_OBJECTID
);
1434 write_extent_buffer(root
->node
, root
->fs_info
->fsid
,
1435 btrfs_header_fsid(), BTRFS_FSID_SIZE
);
1436 btrfs_mark_buffer_dirty(root
->node
);
1437 btrfs_tree_unlock(root
->node
);
1441 int btrfs_init_log_root_tree(struct btrfs_trans_handle
*trans
,
1442 struct btrfs_fs_info
*fs_info
)
1444 struct btrfs_root
*log_root
;
1446 log_root
= alloc_log_tree(trans
, fs_info
);
1447 if (IS_ERR(log_root
))
1448 return PTR_ERR(log_root
);
1449 WARN_ON(fs_info
->log_root_tree
);
1450 fs_info
->log_root_tree
= log_root
;
1454 int btrfs_add_log_tree(struct btrfs_trans_handle
*trans
,
1455 struct btrfs_root
*root
)
1457 struct btrfs_root
*log_root
;
1458 struct btrfs_inode_item
*inode_item
;
1460 log_root
= alloc_log_tree(trans
, root
->fs_info
);
1461 if (IS_ERR(log_root
))
1462 return PTR_ERR(log_root
);
1464 log_root
->last_trans
= trans
->transid
;
1465 log_root
->root_key
.offset
= root
->root_key
.objectid
;
1467 inode_item
= &log_root
->root_item
.inode
;
1468 btrfs_set_stack_inode_generation(inode_item
, 1);
1469 btrfs_set_stack_inode_size(inode_item
, 3);
1470 btrfs_set_stack_inode_nlink(inode_item
, 1);
1471 btrfs_set_stack_inode_nbytes(inode_item
, root
->nodesize
);
1472 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
1474 btrfs_set_root_node(&log_root
->root_item
, log_root
->node
);
1476 WARN_ON(root
->log_root
);
1477 root
->log_root
= log_root
;
1478 root
->log_transid
= 0;
1479 root
->log_transid_committed
= -1;
1480 root
->last_log_commit
= 0;
1484 static struct btrfs_root
*btrfs_read_tree_root(struct btrfs_root
*tree_root
,
1485 struct btrfs_key
*key
)
1487 struct btrfs_root
*root
;
1488 struct btrfs_fs_info
*fs_info
= tree_root
->fs_info
;
1489 struct btrfs_path
*path
;
1493 path
= btrfs_alloc_path();
1495 return ERR_PTR(-ENOMEM
);
1497 root
= btrfs_alloc_root(fs_info
);
1503 __setup_root(tree_root
->nodesize
, tree_root
->sectorsize
,
1504 tree_root
->stripesize
, root
, fs_info
, key
->objectid
);
1506 ret
= btrfs_find_root(tree_root
, key
, path
,
1507 &root
->root_item
, &root
->root_key
);
1514 generation
= btrfs_root_generation(&root
->root_item
);
1515 root
->node
= read_tree_block(root
, btrfs_root_bytenr(&root
->root_item
),
1517 if (IS_ERR(root
->node
)) {
1518 ret
= PTR_ERR(root
->node
);
1520 } else if (!btrfs_buffer_uptodate(root
->node
, generation
, 0)) {
1522 free_extent_buffer(root
->node
);
1525 root
->commit_root
= btrfs_root_node(root
);
1527 btrfs_free_path(path
);
1533 root
= ERR_PTR(ret
);
1537 struct btrfs_root
*btrfs_read_fs_root(struct btrfs_root
*tree_root
,
1538 struct btrfs_key
*location
)
1540 struct btrfs_root
*root
;
1542 root
= btrfs_read_tree_root(tree_root
, location
);
1546 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
1547 set_bit(BTRFS_ROOT_REF_COWS
, &root
->state
);
1548 btrfs_check_and_init_root_item(&root
->root_item
);
1554 int btrfs_init_fs_root(struct btrfs_root
*root
)
1557 struct btrfs_subvolume_writers
*writers
;
1559 root
->free_ino_ctl
= kzalloc(sizeof(*root
->free_ino_ctl
), GFP_NOFS
);
1560 root
->free_ino_pinned
= kzalloc(sizeof(*root
->free_ino_pinned
),
1562 if (!root
->free_ino_pinned
|| !root
->free_ino_ctl
) {
1567 writers
= btrfs_alloc_subvolume_writers();
1568 if (IS_ERR(writers
)) {
1569 ret
= PTR_ERR(writers
);
1572 root
->subv_writers
= writers
;
1574 btrfs_init_free_ino_ctl(root
);
1575 spin_lock_init(&root
->ino_cache_lock
);
1576 init_waitqueue_head(&root
->ino_cache_wait
);
1578 ret
= get_anon_bdev(&root
->anon_dev
);
1584 btrfs_free_subvolume_writers(root
->subv_writers
);
1586 kfree(root
->free_ino_ctl
);
1587 kfree(root
->free_ino_pinned
);
1591 static struct btrfs_root
*btrfs_lookup_fs_root(struct btrfs_fs_info
*fs_info
,
1594 struct btrfs_root
*root
;
1596 spin_lock(&fs_info
->fs_roots_radix_lock
);
1597 root
= radix_tree_lookup(&fs_info
->fs_roots_radix
,
1598 (unsigned long)root_id
);
1599 spin_unlock(&fs_info
->fs_roots_radix_lock
);
1603 int btrfs_insert_fs_root(struct btrfs_fs_info
*fs_info
,
1604 struct btrfs_root
*root
)
1608 ret
= radix_tree_preload(GFP_NOFS
& ~__GFP_HIGHMEM
);
1612 spin_lock(&fs_info
->fs_roots_radix_lock
);
1613 ret
= radix_tree_insert(&fs_info
->fs_roots_radix
,
1614 (unsigned long)root
->root_key
.objectid
,
1617 set_bit(BTRFS_ROOT_IN_RADIX
, &root
->state
);
1618 spin_unlock(&fs_info
->fs_roots_radix_lock
);
1619 radix_tree_preload_end();
1624 struct btrfs_root
*btrfs_get_fs_root(struct btrfs_fs_info
*fs_info
,
1625 struct btrfs_key
*location
,
1628 struct btrfs_root
*root
;
1629 struct btrfs_path
*path
;
1630 struct btrfs_key key
;
1633 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
1634 return fs_info
->tree_root
;
1635 if (location
->objectid
== BTRFS_EXTENT_TREE_OBJECTID
)
1636 return fs_info
->extent_root
;
1637 if (location
->objectid
== BTRFS_CHUNK_TREE_OBJECTID
)
1638 return fs_info
->chunk_root
;
1639 if (location
->objectid
== BTRFS_DEV_TREE_OBJECTID
)
1640 return fs_info
->dev_root
;
1641 if (location
->objectid
== BTRFS_CSUM_TREE_OBJECTID
)
1642 return fs_info
->csum_root
;
1643 if (location
->objectid
== BTRFS_QUOTA_TREE_OBJECTID
)
1644 return fs_info
->quota_root
? fs_info
->quota_root
:
1646 if (location
->objectid
== BTRFS_UUID_TREE_OBJECTID
)
1647 return fs_info
->uuid_root
? fs_info
->uuid_root
:
1650 root
= btrfs_lookup_fs_root(fs_info
, location
->objectid
);
1652 if (check_ref
&& btrfs_root_refs(&root
->root_item
) == 0)
1653 return ERR_PTR(-ENOENT
);
1657 root
= btrfs_read_fs_root(fs_info
->tree_root
, location
);
1661 if (check_ref
&& btrfs_root_refs(&root
->root_item
) == 0) {
1666 ret
= btrfs_init_fs_root(root
);
1670 path
= btrfs_alloc_path();
1675 key
.objectid
= BTRFS_ORPHAN_OBJECTID
;
1676 key
.type
= BTRFS_ORPHAN_ITEM_KEY
;
1677 key
.offset
= location
->objectid
;
1679 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
1680 btrfs_free_path(path
);
1684 set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &root
->state
);
1686 ret
= btrfs_insert_fs_root(fs_info
, root
);
1688 if (ret
== -EEXIST
) {
1697 return ERR_PTR(ret
);
1700 static int btrfs_congested_fn(void *congested_data
, int bdi_bits
)
1702 struct btrfs_fs_info
*info
= (struct btrfs_fs_info
*)congested_data
;
1704 struct btrfs_device
*device
;
1705 struct backing_dev_info
*bdi
;
1708 list_for_each_entry_rcu(device
, &info
->fs_devices
->devices
, dev_list
) {
1711 bdi
= blk_get_backing_dev_info(device
->bdev
);
1712 if (bdi_congested(bdi
, bdi_bits
)) {
1721 static int setup_bdi(struct btrfs_fs_info
*info
, struct backing_dev_info
*bdi
)
1725 err
= bdi_setup_and_register(bdi
, "btrfs");
1729 bdi
->ra_pages
= VM_MAX_READAHEAD
* 1024 / PAGE_CACHE_SIZE
;
1730 bdi
->congested_fn
= btrfs_congested_fn
;
1731 bdi
->congested_data
= info
;
1732 bdi
->capabilities
|= BDI_CAP_CGROUP_WRITEBACK
;
1737 * called by the kthread helper functions to finally call the bio end_io
1738 * functions. This is where read checksum verification actually happens
1740 static void end_workqueue_fn(struct btrfs_work
*work
)
1743 struct btrfs_end_io_wq
*end_io_wq
;
1745 end_io_wq
= container_of(work
, struct btrfs_end_io_wq
, work
);
1746 bio
= end_io_wq
->bio
;
1748 bio
->bi_error
= end_io_wq
->error
;
1749 bio
->bi_private
= end_io_wq
->private;
1750 bio
->bi_end_io
= end_io_wq
->end_io
;
1751 kmem_cache_free(btrfs_end_io_wq_cache
, end_io_wq
);
1755 static int cleaner_kthread(void *arg
)
1757 struct btrfs_root
*root
= arg
;
1759 struct btrfs_trans_handle
*trans
;
1764 /* Make the cleaner go to sleep early. */
1765 if (btrfs_need_cleaner_sleep(root
))
1768 if (!mutex_trylock(&root
->fs_info
->cleaner_mutex
))
1772 * Avoid the problem that we change the status of the fs
1773 * during the above check and trylock.
1775 if (btrfs_need_cleaner_sleep(root
)) {
1776 mutex_unlock(&root
->fs_info
->cleaner_mutex
);
1780 btrfs_run_delayed_iputs(root
);
1781 again
= btrfs_clean_one_deleted_snapshot(root
);
1782 mutex_unlock(&root
->fs_info
->cleaner_mutex
);
1785 * The defragger has dealt with the R/O remount and umount,
1786 * needn't do anything special here.
1788 btrfs_run_defrag_inodes(root
->fs_info
);
1791 * Acquires fs_info->delete_unused_bgs_mutex to avoid racing
1792 * with relocation (btrfs_relocate_chunk) and relocation
1793 * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
1794 * after acquiring fs_info->delete_unused_bgs_mutex. So we
1795 * can't hold, nor need to, fs_info->cleaner_mutex when deleting
1796 * unused block groups.
1798 btrfs_delete_unused_bgs(root
->fs_info
);
1800 if (!try_to_freeze() && !again
) {
1801 set_current_state(TASK_INTERRUPTIBLE
);
1802 if (!kthread_should_stop())
1804 __set_current_state(TASK_RUNNING
);
1806 } while (!kthread_should_stop());
1809 * Transaction kthread is stopped before us and wakes us up.
1810 * However we might have started a new transaction and COWed some
1811 * tree blocks when deleting unused block groups for example. So
1812 * make sure we commit the transaction we started to have a clean
1813 * shutdown when evicting the btree inode - if it has dirty pages
1814 * when we do the final iput() on it, eviction will trigger a
1815 * writeback for it which will fail with null pointer dereferences
1816 * since work queues and other resources were already released and
1817 * destroyed by the time the iput/eviction/writeback is made.
1819 trans
= btrfs_attach_transaction(root
);
1820 if (IS_ERR(trans
)) {
1821 if (PTR_ERR(trans
) != -ENOENT
)
1822 btrfs_err(root
->fs_info
,
1823 "cleaner transaction attach returned %ld",
1828 ret
= btrfs_commit_transaction(trans
, root
);
1830 btrfs_err(root
->fs_info
,
1831 "cleaner open transaction commit returned %d",
1838 static int transaction_kthread(void *arg
)
1840 struct btrfs_root
*root
= arg
;
1841 struct btrfs_trans_handle
*trans
;
1842 struct btrfs_transaction
*cur
;
1845 unsigned long delay
;
1849 cannot_commit
= false;
1850 delay
= HZ
* root
->fs_info
->commit_interval
;
1851 mutex_lock(&root
->fs_info
->transaction_kthread_mutex
);
1853 spin_lock(&root
->fs_info
->trans_lock
);
1854 cur
= root
->fs_info
->running_transaction
;
1856 spin_unlock(&root
->fs_info
->trans_lock
);
1860 now
= get_seconds();
1861 if (cur
->state
< TRANS_STATE_BLOCKED
&&
1862 (now
< cur
->start_time
||
1863 now
- cur
->start_time
< root
->fs_info
->commit_interval
)) {
1864 spin_unlock(&root
->fs_info
->trans_lock
);
1868 transid
= cur
->transid
;
1869 spin_unlock(&root
->fs_info
->trans_lock
);
1871 /* If the file system is aborted, this will always fail. */
1872 trans
= btrfs_attach_transaction(root
);
1873 if (IS_ERR(trans
)) {
1874 if (PTR_ERR(trans
) != -ENOENT
)
1875 cannot_commit
= true;
1878 if (transid
== trans
->transid
) {
1879 btrfs_commit_transaction(trans
, root
);
1881 btrfs_end_transaction(trans
, root
);
1884 wake_up_process(root
->fs_info
->cleaner_kthread
);
1885 mutex_unlock(&root
->fs_info
->transaction_kthread_mutex
);
1887 if (unlikely(test_bit(BTRFS_FS_STATE_ERROR
,
1888 &root
->fs_info
->fs_state
)))
1889 btrfs_cleanup_transaction(root
);
1890 if (!try_to_freeze()) {
1891 set_current_state(TASK_INTERRUPTIBLE
);
1892 if (!kthread_should_stop() &&
1893 (!btrfs_transaction_blocked(root
->fs_info
) ||
1895 schedule_timeout(delay
);
1896 __set_current_state(TASK_RUNNING
);
1898 } while (!kthread_should_stop());
1903 * this will find the highest generation in the array of
1904 * root backups. The index of the highest array is returned,
1905 * or -1 if we can't find anything.
1907 * We check to make sure the array is valid by comparing the
1908 * generation of the latest root in the array with the generation
1909 * in the super block. If they don't match we pitch it.
1911 static int find_newest_super_backup(struct btrfs_fs_info
*info
, u64 newest_gen
)
1914 int newest_index
= -1;
1915 struct btrfs_root_backup
*root_backup
;
1918 for (i
= 0; i
< BTRFS_NUM_BACKUP_ROOTS
; i
++) {
1919 root_backup
= info
->super_copy
->super_roots
+ i
;
1920 cur
= btrfs_backup_tree_root_gen(root_backup
);
1921 if (cur
== newest_gen
)
1925 /* check to see if we actually wrapped around */
1926 if (newest_index
== BTRFS_NUM_BACKUP_ROOTS
- 1) {
1927 root_backup
= info
->super_copy
->super_roots
;
1928 cur
= btrfs_backup_tree_root_gen(root_backup
);
1929 if (cur
== newest_gen
)
1932 return newest_index
;
1937 * find the oldest backup so we know where to store new entries
1938 * in the backup array. This will set the backup_root_index
1939 * field in the fs_info struct
1941 static void find_oldest_super_backup(struct btrfs_fs_info
*info
,
1944 int newest_index
= -1;
1946 newest_index
= find_newest_super_backup(info
, newest_gen
);
1947 /* if there was garbage in there, just move along */
1948 if (newest_index
== -1) {
1949 info
->backup_root_index
= 0;
1951 info
->backup_root_index
= (newest_index
+ 1) % BTRFS_NUM_BACKUP_ROOTS
;
1956 * copy all the root pointers into the super backup array.
1957 * this will bump the backup pointer by one when it is
1960 static void backup_super_roots(struct btrfs_fs_info
*info
)
1963 struct btrfs_root_backup
*root_backup
;
1966 next_backup
= info
->backup_root_index
;
1967 last_backup
= (next_backup
+ BTRFS_NUM_BACKUP_ROOTS
- 1) %
1968 BTRFS_NUM_BACKUP_ROOTS
;
1971 * just overwrite the last backup if we're at the same generation
1972 * this happens only at umount
1974 root_backup
= info
->super_for_commit
->super_roots
+ last_backup
;
1975 if (btrfs_backup_tree_root_gen(root_backup
) ==
1976 btrfs_header_generation(info
->tree_root
->node
))
1977 next_backup
= last_backup
;
1979 root_backup
= info
->super_for_commit
->super_roots
+ next_backup
;
1982 * make sure all of our padding and empty slots get zero filled
1983 * regardless of which ones we use today
1985 memset(root_backup
, 0, sizeof(*root_backup
));
1987 info
->backup_root_index
= (next_backup
+ 1) % BTRFS_NUM_BACKUP_ROOTS
;
1989 btrfs_set_backup_tree_root(root_backup
, info
->tree_root
->node
->start
);
1990 btrfs_set_backup_tree_root_gen(root_backup
,
1991 btrfs_header_generation(info
->tree_root
->node
));
1993 btrfs_set_backup_tree_root_level(root_backup
,
1994 btrfs_header_level(info
->tree_root
->node
));
1996 btrfs_set_backup_chunk_root(root_backup
, info
->chunk_root
->node
->start
);
1997 btrfs_set_backup_chunk_root_gen(root_backup
,
1998 btrfs_header_generation(info
->chunk_root
->node
));
1999 btrfs_set_backup_chunk_root_level(root_backup
,
2000 btrfs_header_level(info
->chunk_root
->node
));
2002 btrfs_set_backup_extent_root(root_backup
, info
->extent_root
->node
->start
);
2003 btrfs_set_backup_extent_root_gen(root_backup
,
2004 btrfs_header_generation(info
->extent_root
->node
));
2005 btrfs_set_backup_extent_root_level(root_backup
,
2006 btrfs_header_level(info
->extent_root
->node
));
2009 * we might commit during log recovery, which happens before we set
2010 * the fs_root. Make sure it is valid before we fill it in.
2012 if (info
->fs_root
&& info
->fs_root
->node
) {
2013 btrfs_set_backup_fs_root(root_backup
,
2014 info
->fs_root
->node
->start
);
2015 btrfs_set_backup_fs_root_gen(root_backup
,
2016 btrfs_header_generation(info
->fs_root
->node
));
2017 btrfs_set_backup_fs_root_level(root_backup
,
2018 btrfs_header_level(info
->fs_root
->node
));
2021 btrfs_set_backup_dev_root(root_backup
, info
->dev_root
->node
->start
);
2022 btrfs_set_backup_dev_root_gen(root_backup
,
2023 btrfs_header_generation(info
->dev_root
->node
));
2024 btrfs_set_backup_dev_root_level(root_backup
,
2025 btrfs_header_level(info
->dev_root
->node
));
2027 btrfs_set_backup_csum_root(root_backup
, info
->csum_root
->node
->start
);
2028 btrfs_set_backup_csum_root_gen(root_backup
,
2029 btrfs_header_generation(info
->csum_root
->node
));
2030 btrfs_set_backup_csum_root_level(root_backup
,
2031 btrfs_header_level(info
->csum_root
->node
));
2033 btrfs_set_backup_total_bytes(root_backup
,
2034 btrfs_super_total_bytes(info
->super_copy
));
2035 btrfs_set_backup_bytes_used(root_backup
,
2036 btrfs_super_bytes_used(info
->super_copy
));
2037 btrfs_set_backup_num_devices(root_backup
,
2038 btrfs_super_num_devices(info
->super_copy
));
2041 * if we don't copy this out to the super_copy, it won't get remembered
2042 * for the next commit
2044 memcpy(&info
->super_copy
->super_roots
,
2045 &info
->super_for_commit
->super_roots
,
2046 sizeof(*root_backup
) * BTRFS_NUM_BACKUP_ROOTS
);
2050 * this copies info out of the root backup array and back into
2051 * the in-memory super block. It is meant to help iterate through
2052 * the array, so you send it the number of backups you've already
2053 * tried and the last backup index you used.
2055 * this returns -1 when it has tried all the backups
2057 static noinline
int next_root_backup(struct btrfs_fs_info
*info
,
2058 struct btrfs_super_block
*super
,
2059 int *num_backups_tried
, int *backup_index
)
2061 struct btrfs_root_backup
*root_backup
;
2062 int newest
= *backup_index
;
2064 if (*num_backups_tried
== 0) {
2065 u64 gen
= btrfs_super_generation(super
);
2067 newest
= find_newest_super_backup(info
, gen
);
2071 *backup_index
= newest
;
2072 *num_backups_tried
= 1;
2073 } else if (*num_backups_tried
== BTRFS_NUM_BACKUP_ROOTS
) {
2074 /* we've tried all the backups, all done */
2077 /* jump to the next oldest backup */
2078 newest
= (*backup_index
+ BTRFS_NUM_BACKUP_ROOTS
- 1) %
2079 BTRFS_NUM_BACKUP_ROOTS
;
2080 *backup_index
= newest
;
2081 *num_backups_tried
+= 1;
2083 root_backup
= super
->super_roots
+ newest
;
2085 btrfs_set_super_generation(super
,
2086 btrfs_backup_tree_root_gen(root_backup
));
2087 btrfs_set_super_root(super
, btrfs_backup_tree_root(root_backup
));
2088 btrfs_set_super_root_level(super
,
2089 btrfs_backup_tree_root_level(root_backup
));
2090 btrfs_set_super_bytes_used(super
, btrfs_backup_bytes_used(root_backup
));
2093 * fixme: the total bytes and num_devices need to match or we should
2096 btrfs_set_super_total_bytes(super
, btrfs_backup_total_bytes(root_backup
));
2097 btrfs_set_super_num_devices(super
, btrfs_backup_num_devices(root_backup
));
2101 /* helper to cleanup workers */
2102 static void btrfs_stop_all_workers(struct btrfs_fs_info
*fs_info
)
2104 btrfs_destroy_workqueue(fs_info
->fixup_workers
);
2105 btrfs_destroy_workqueue(fs_info
->delalloc_workers
);
2106 btrfs_destroy_workqueue(fs_info
->workers
);
2107 btrfs_destroy_workqueue(fs_info
->endio_workers
);
2108 btrfs_destroy_workqueue(fs_info
->endio_meta_workers
);
2109 btrfs_destroy_workqueue(fs_info
->endio_raid56_workers
);
2110 btrfs_destroy_workqueue(fs_info
->endio_repair_workers
);
2111 btrfs_destroy_workqueue(fs_info
->rmw_workers
);
2112 btrfs_destroy_workqueue(fs_info
->endio_meta_write_workers
);
2113 btrfs_destroy_workqueue(fs_info
->endio_write_workers
);
2114 btrfs_destroy_workqueue(fs_info
->endio_freespace_worker
);
2115 btrfs_destroy_workqueue(fs_info
->submit_workers
);
2116 btrfs_destroy_workqueue(fs_info
->delayed_workers
);
2117 btrfs_destroy_workqueue(fs_info
->caching_workers
);
2118 btrfs_destroy_workqueue(fs_info
->readahead_workers
);
2119 btrfs_destroy_workqueue(fs_info
->flush_workers
);
2120 btrfs_destroy_workqueue(fs_info
->qgroup_rescan_workers
);
2121 btrfs_destroy_workqueue(fs_info
->extent_workers
);
2124 static void free_root_extent_buffers(struct btrfs_root
*root
)
2127 free_extent_buffer(root
->node
);
2128 free_extent_buffer(root
->commit_root
);
2130 root
->commit_root
= NULL
;
2134 /* helper to cleanup tree roots */
2135 static void free_root_pointers(struct btrfs_fs_info
*info
, int chunk_root
)
2137 free_root_extent_buffers(info
->tree_root
);
2139 free_root_extent_buffers(info
->dev_root
);
2140 free_root_extent_buffers(info
->extent_root
);
2141 free_root_extent_buffers(info
->csum_root
);
2142 free_root_extent_buffers(info
->quota_root
);
2143 free_root_extent_buffers(info
->uuid_root
);
2145 free_root_extent_buffers(info
->chunk_root
);
2148 void btrfs_free_fs_roots(struct btrfs_fs_info
*fs_info
)
2151 struct btrfs_root
*gang
[8];
2154 while (!list_empty(&fs_info
->dead_roots
)) {
2155 gang
[0] = list_entry(fs_info
->dead_roots
.next
,
2156 struct btrfs_root
, root_list
);
2157 list_del(&gang
[0]->root_list
);
2159 if (test_bit(BTRFS_ROOT_IN_RADIX
, &gang
[0]->state
)) {
2160 btrfs_drop_and_free_fs_root(fs_info
, gang
[0]);
2162 free_extent_buffer(gang
[0]->node
);
2163 free_extent_buffer(gang
[0]->commit_root
);
2164 btrfs_put_fs_root(gang
[0]);
2169 ret
= radix_tree_gang_lookup(&fs_info
->fs_roots_radix
,
2174 for (i
= 0; i
< ret
; i
++)
2175 btrfs_drop_and_free_fs_root(fs_info
, gang
[i
]);
2178 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
)) {
2179 btrfs_free_log_root_tree(NULL
, fs_info
);
2180 btrfs_destroy_pinned_extent(fs_info
->tree_root
,
2181 fs_info
->pinned_extents
);
2185 static void btrfs_init_scrub(struct btrfs_fs_info
*fs_info
)
2187 mutex_init(&fs_info
->scrub_lock
);
2188 atomic_set(&fs_info
->scrubs_running
, 0);
2189 atomic_set(&fs_info
->scrub_pause_req
, 0);
2190 atomic_set(&fs_info
->scrubs_paused
, 0);
2191 atomic_set(&fs_info
->scrub_cancel_req
, 0);
2192 init_waitqueue_head(&fs_info
->scrub_pause_wait
);
2193 fs_info
->scrub_workers_refcnt
= 0;
2196 static void btrfs_init_balance(struct btrfs_fs_info
*fs_info
)
2198 spin_lock_init(&fs_info
->balance_lock
);
2199 mutex_init(&fs_info
->balance_mutex
);
2200 atomic_set(&fs_info
->balance_running
, 0);
2201 atomic_set(&fs_info
->balance_pause_req
, 0);
2202 atomic_set(&fs_info
->balance_cancel_req
, 0);
2203 fs_info
->balance_ctl
= NULL
;
2204 init_waitqueue_head(&fs_info
->balance_wait_q
);
2207 static void btrfs_init_btree_inode(struct btrfs_fs_info
*fs_info
,
2208 struct btrfs_root
*tree_root
)
2210 fs_info
->btree_inode
->i_ino
= BTRFS_BTREE_INODE_OBJECTID
;
2211 set_nlink(fs_info
->btree_inode
, 1);
2213 * we set the i_size on the btree inode to the max possible int.
2214 * the real end of the address space is determined by all of
2215 * the devices in the system
2217 fs_info
->btree_inode
->i_size
= OFFSET_MAX
;
2218 fs_info
->btree_inode
->i_mapping
->a_ops
= &btree_aops
;
2220 RB_CLEAR_NODE(&BTRFS_I(fs_info
->btree_inode
)->rb_node
);
2221 extent_io_tree_init(&BTRFS_I(fs_info
->btree_inode
)->io_tree
,
2222 fs_info
->btree_inode
->i_mapping
);
2223 BTRFS_I(fs_info
->btree_inode
)->io_tree
.track_uptodate
= 0;
2224 extent_map_tree_init(&BTRFS_I(fs_info
->btree_inode
)->extent_tree
);
2226 BTRFS_I(fs_info
->btree_inode
)->io_tree
.ops
= &btree_extent_io_ops
;
2228 BTRFS_I(fs_info
->btree_inode
)->root
= tree_root
;
2229 memset(&BTRFS_I(fs_info
->btree_inode
)->location
, 0,
2230 sizeof(struct btrfs_key
));
2231 set_bit(BTRFS_INODE_DUMMY
,
2232 &BTRFS_I(fs_info
->btree_inode
)->runtime_flags
);
2233 btrfs_insert_inode_hash(fs_info
->btree_inode
);
2236 static void btrfs_init_dev_replace_locks(struct btrfs_fs_info
*fs_info
)
2238 fs_info
->dev_replace
.lock_owner
= 0;
2239 atomic_set(&fs_info
->dev_replace
.nesting_level
, 0);
2240 mutex_init(&fs_info
->dev_replace
.lock_finishing_cancel_unmount
);
2241 mutex_init(&fs_info
->dev_replace
.lock_management_lock
);
2242 mutex_init(&fs_info
->dev_replace
.lock
);
2243 init_waitqueue_head(&fs_info
->replace_wait
);
2246 static void btrfs_init_qgroup(struct btrfs_fs_info
*fs_info
)
2248 spin_lock_init(&fs_info
->qgroup_lock
);
2249 mutex_init(&fs_info
->qgroup_ioctl_lock
);
2250 fs_info
->qgroup_tree
= RB_ROOT
;
2251 fs_info
->qgroup_op_tree
= RB_ROOT
;
2252 INIT_LIST_HEAD(&fs_info
->dirty_qgroups
);
2253 fs_info
->qgroup_seq
= 1;
2254 fs_info
->quota_enabled
= 0;
2255 fs_info
->pending_quota_state
= 0;
2256 fs_info
->qgroup_ulist
= NULL
;
2257 mutex_init(&fs_info
->qgroup_rescan_lock
);
2260 static int btrfs_init_workqueues(struct btrfs_fs_info
*fs_info
,
2261 struct btrfs_fs_devices
*fs_devices
)
2263 int max_active
= fs_info
->thread_pool_size
;
2264 unsigned int flags
= WQ_MEM_RECLAIM
| WQ_FREEZABLE
| WQ_UNBOUND
;
2267 btrfs_alloc_workqueue("worker", flags
| WQ_HIGHPRI
,
2270 fs_info
->delalloc_workers
=
2271 btrfs_alloc_workqueue("delalloc", flags
, max_active
, 2);
2273 fs_info
->flush_workers
=
2274 btrfs_alloc_workqueue("flush_delalloc", flags
, max_active
, 0);
2276 fs_info
->caching_workers
=
2277 btrfs_alloc_workqueue("cache", flags
, max_active
, 0);
2280 * a higher idle thresh on the submit workers makes it much more
2281 * likely that bios will be send down in a sane order to the
2284 fs_info
->submit_workers
=
2285 btrfs_alloc_workqueue("submit", flags
,
2286 min_t(u64
, fs_devices
->num_devices
,
2289 fs_info
->fixup_workers
=
2290 btrfs_alloc_workqueue("fixup", flags
, 1, 0);
2293 * endios are largely parallel and should have a very
2296 fs_info
->endio_workers
=
2297 btrfs_alloc_workqueue("endio", flags
, max_active
, 4);
2298 fs_info
->endio_meta_workers
=
2299 btrfs_alloc_workqueue("endio-meta", flags
, max_active
, 4);
2300 fs_info
->endio_meta_write_workers
=
2301 btrfs_alloc_workqueue("endio-meta-write", flags
, max_active
, 2);
2302 fs_info
->endio_raid56_workers
=
2303 btrfs_alloc_workqueue("endio-raid56", flags
, max_active
, 4);
2304 fs_info
->endio_repair_workers
=
2305 btrfs_alloc_workqueue("endio-repair", flags
, 1, 0);
2306 fs_info
->rmw_workers
=
2307 btrfs_alloc_workqueue("rmw", flags
, max_active
, 2);
2308 fs_info
->endio_write_workers
=
2309 btrfs_alloc_workqueue("endio-write", flags
, max_active
, 2);
2310 fs_info
->endio_freespace_worker
=
2311 btrfs_alloc_workqueue("freespace-write", flags
, max_active
, 0);
2312 fs_info
->delayed_workers
=
2313 btrfs_alloc_workqueue("delayed-meta", flags
, max_active
, 0);
2314 fs_info
->readahead_workers
=
2315 btrfs_alloc_workqueue("readahead", flags
, max_active
, 2);
2316 fs_info
->qgroup_rescan_workers
=
2317 btrfs_alloc_workqueue("qgroup-rescan", flags
, 1, 0);
2318 fs_info
->extent_workers
=
2319 btrfs_alloc_workqueue("extent-refs", flags
,
2320 min_t(u64
, fs_devices
->num_devices
,
2323 if (!(fs_info
->workers
&& fs_info
->delalloc_workers
&&
2324 fs_info
->submit_workers
&& fs_info
->flush_workers
&&
2325 fs_info
->endio_workers
&& fs_info
->endio_meta_workers
&&
2326 fs_info
->endio_meta_write_workers
&&
2327 fs_info
->endio_repair_workers
&&
2328 fs_info
->endio_write_workers
&& fs_info
->endio_raid56_workers
&&
2329 fs_info
->endio_freespace_worker
&& fs_info
->rmw_workers
&&
2330 fs_info
->caching_workers
&& fs_info
->readahead_workers
&&
2331 fs_info
->fixup_workers
&& fs_info
->delayed_workers
&&
2332 fs_info
->extent_workers
&&
2333 fs_info
->qgroup_rescan_workers
)) {
2340 static int btrfs_replay_log(struct btrfs_fs_info
*fs_info
,
2341 struct btrfs_fs_devices
*fs_devices
)
2344 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
2345 struct btrfs_root
*log_tree_root
;
2346 struct btrfs_super_block
*disk_super
= fs_info
->super_copy
;
2347 u64 bytenr
= btrfs_super_log_root(disk_super
);
2349 if (fs_devices
->rw_devices
== 0) {
2350 btrfs_warn(fs_info
, "log replay required on RO media");
2354 log_tree_root
= btrfs_alloc_root(fs_info
);
2358 __setup_root(tree_root
->nodesize
, tree_root
->sectorsize
,
2359 tree_root
->stripesize
, log_tree_root
, fs_info
,
2360 BTRFS_TREE_LOG_OBJECTID
);
2362 log_tree_root
->node
= read_tree_block(tree_root
, bytenr
,
2363 fs_info
->generation
+ 1);
2364 if (IS_ERR(log_tree_root
->node
)) {
2365 btrfs_warn(fs_info
, "failed to read log tree");
2366 ret
= PTR_ERR(log_tree_root
->node
);
2367 kfree(log_tree_root
);
2369 } else if (!extent_buffer_uptodate(log_tree_root
->node
)) {
2370 btrfs_err(fs_info
, "failed to read log tree");
2371 free_extent_buffer(log_tree_root
->node
);
2372 kfree(log_tree_root
);
2375 /* returns with log_tree_root freed on success */
2376 ret
= btrfs_recover_log_trees(log_tree_root
);
2378 btrfs_error(tree_root
->fs_info
, ret
,
2379 "Failed to recover log tree");
2380 free_extent_buffer(log_tree_root
->node
);
2381 kfree(log_tree_root
);
2385 if (fs_info
->sb
->s_flags
& MS_RDONLY
) {
2386 ret
= btrfs_commit_super(tree_root
);
2394 static int btrfs_read_roots(struct btrfs_fs_info
*fs_info
,
2395 struct btrfs_root
*tree_root
)
2397 struct btrfs_root
*root
;
2398 struct btrfs_key location
;
2401 location
.objectid
= BTRFS_EXTENT_TREE_OBJECTID
;
2402 location
.type
= BTRFS_ROOT_ITEM_KEY
;
2403 location
.offset
= 0;
2405 root
= btrfs_read_tree_root(tree_root
, &location
);
2407 return PTR_ERR(root
);
2408 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2409 fs_info
->extent_root
= root
;
2411 location
.objectid
= BTRFS_DEV_TREE_OBJECTID
;
2412 root
= btrfs_read_tree_root(tree_root
, &location
);
2414 return PTR_ERR(root
);
2415 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2416 fs_info
->dev_root
= root
;
2417 btrfs_init_devices_late(fs_info
);
2419 location
.objectid
= BTRFS_CSUM_TREE_OBJECTID
;
2420 root
= btrfs_read_tree_root(tree_root
, &location
);
2422 return PTR_ERR(root
);
2423 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2424 fs_info
->csum_root
= root
;
2426 location
.objectid
= BTRFS_QUOTA_TREE_OBJECTID
;
2427 root
= btrfs_read_tree_root(tree_root
, &location
);
2428 if (!IS_ERR(root
)) {
2429 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2430 fs_info
->quota_enabled
= 1;
2431 fs_info
->pending_quota_state
= 1;
2432 fs_info
->quota_root
= root
;
2435 location
.objectid
= BTRFS_UUID_TREE_OBJECTID
;
2436 root
= btrfs_read_tree_root(tree_root
, &location
);
2438 ret
= PTR_ERR(root
);
2442 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2443 fs_info
->uuid_root
= root
;
2449 int open_ctree(struct super_block
*sb
,
2450 struct btrfs_fs_devices
*fs_devices
,
2458 struct btrfs_key location
;
2459 struct buffer_head
*bh
;
2460 struct btrfs_super_block
*disk_super
;
2461 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
2462 struct btrfs_root
*tree_root
;
2463 struct btrfs_root
*chunk_root
;
2466 int num_backups_tried
= 0;
2467 int backup_index
= 0;
2470 tree_root
= fs_info
->tree_root
= btrfs_alloc_root(fs_info
);
2471 chunk_root
= fs_info
->chunk_root
= btrfs_alloc_root(fs_info
);
2472 if (!tree_root
|| !chunk_root
) {
2477 ret
= init_srcu_struct(&fs_info
->subvol_srcu
);
2483 ret
= setup_bdi(fs_info
, &fs_info
->bdi
);
2489 ret
= percpu_counter_init(&fs_info
->dirty_metadata_bytes
, 0, GFP_KERNEL
);
2494 fs_info
->dirty_metadata_batch
= PAGE_CACHE_SIZE
*
2495 (1 + ilog2(nr_cpu_ids
));
2497 ret
= percpu_counter_init(&fs_info
->delalloc_bytes
, 0, GFP_KERNEL
);
2500 goto fail_dirty_metadata_bytes
;
2503 ret
= percpu_counter_init(&fs_info
->bio_counter
, 0, GFP_KERNEL
);
2506 goto fail_delalloc_bytes
;
2509 fs_info
->btree_inode
= new_inode(sb
);
2510 if (!fs_info
->btree_inode
) {
2512 goto fail_bio_counter
;
2515 mapping_set_gfp_mask(fs_info
->btree_inode
->i_mapping
, GFP_NOFS
);
2517 INIT_RADIX_TREE(&fs_info
->fs_roots_radix
, GFP_ATOMIC
);
2518 INIT_RADIX_TREE(&fs_info
->buffer_radix
, GFP_ATOMIC
);
2519 INIT_LIST_HEAD(&fs_info
->trans_list
);
2520 INIT_LIST_HEAD(&fs_info
->dead_roots
);
2521 INIT_LIST_HEAD(&fs_info
->delayed_iputs
);
2522 INIT_LIST_HEAD(&fs_info
->delalloc_roots
);
2523 INIT_LIST_HEAD(&fs_info
->caching_block_groups
);
2524 spin_lock_init(&fs_info
->delalloc_root_lock
);
2525 spin_lock_init(&fs_info
->trans_lock
);
2526 spin_lock_init(&fs_info
->fs_roots_radix_lock
);
2527 spin_lock_init(&fs_info
->delayed_iput_lock
);
2528 spin_lock_init(&fs_info
->defrag_inodes_lock
);
2529 spin_lock_init(&fs_info
->free_chunk_lock
);
2530 spin_lock_init(&fs_info
->tree_mod_seq_lock
);
2531 spin_lock_init(&fs_info
->super_lock
);
2532 spin_lock_init(&fs_info
->qgroup_op_lock
);
2533 spin_lock_init(&fs_info
->buffer_lock
);
2534 spin_lock_init(&fs_info
->unused_bgs_lock
);
2535 rwlock_init(&fs_info
->tree_mod_log_lock
);
2536 mutex_init(&fs_info
->unused_bg_unpin_mutex
);
2537 mutex_init(&fs_info
->delete_unused_bgs_mutex
);
2538 mutex_init(&fs_info
->reloc_mutex
);
2539 mutex_init(&fs_info
->delalloc_root_mutex
);
2540 seqlock_init(&fs_info
->profiles_lock
);
2541 init_rwsem(&fs_info
->delayed_iput_sem
);
2543 INIT_LIST_HEAD(&fs_info
->dirty_cowonly_roots
);
2544 INIT_LIST_HEAD(&fs_info
->space_info
);
2545 INIT_LIST_HEAD(&fs_info
->tree_mod_seq_list
);
2546 INIT_LIST_HEAD(&fs_info
->unused_bgs
);
2547 btrfs_mapping_init(&fs_info
->mapping_tree
);
2548 btrfs_init_block_rsv(&fs_info
->global_block_rsv
,
2549 BTRFS_BLOCK_RSV_GLOBAL
);
2550 btrfs_init_block_rsv(&fs_info
->delalloc_block_rsv
,
2551 BTRFS_BLOCK_RSV_DELALLOC
);
2552 btrfs_init_block_rsv(&fs_info
->trans_block_rsv
, BTRFS_BLOCK_RSV_TRANS
);
2553 btrfs_init_block_rsv(&fs_info
->chunk_block_rsv
, BTRFS_BLOCK_RSV_CHUNK
);
2554 btrfs_init_block_rsv(&fs_info
->empty_block_rsv
, BTRFS_BLOCK_RSV_EMPTY
);
2555 btrfs_init_block_rsv(&fs_info
->delayed_block_rsv
,
2556 BTRFS_BLOCK_RSV_DELOPS
);
2557 atomic_set(&fs_info
->nr_async_submits
, 0);
2558 atomic_set(&fs_info
->async_delalloc_pages
, 0);
2559 atomic_set(&fs_info
->async_submit_draining
, 0);
2560 atomic_set(&fs_info
->nr_async_bios
, 0);
2561 atomic_set(&fs_info
->defrag_running
, 0);
2562 atomic_set(&fs_info
->qgroup_op_seq
, 0);
2563 atomic64_set(&fs_info
->tree_mod_seq
, 0);
2565 fs_info
->max_inline
= BTRFS_DEFAULT_MAX_INLINE
;
2566 fs_info
->metadata_ratio
= 0;
2567 fs_info
->defrag_inodes
= RB_ROOT
;
2568 fs_info
->free_chunk_space
= 0;
2569 fs_info
->tree_mod_log
= RB_ROOT
;
2570 fs_info
->commit_interval
= BTRFS_DEFAULT_COMMIT_INTERVAL
;
2571 fs_info
->avg_delayed_ref_runtime
= NSEC_PER_SEC
>> 6; /* div by 64 */
2572 /* readahead state */
2573 INIT_RADIX_TREE(&fs_info
->reada_tree
, GFP_NOFS
& ~__GFP_WAIT
);
2574 spin_lock_init(&fs_info
->reada_lock
);
2576 fs_info
->thread_pool_size
= min_t(unsigned long,
2577 num_online_cpus() + 2, 8);
2579 INIT_LIST_HEAD(&fs_info
->ordered_roots
);
2580 spin_lock_init(&fs_info
->ordered_root_lock
);
2581 fs_info
->delayed_root
= kmalloc(sizeof(struct btrfs_delayed_root
),
2583 if (!fs_info
->delayed_root
) {
2587 btrfs_init_delayed_root(fs_info
->delayed_root
);
2589 btrfs_init_scrub(fs_info
);
2590 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2591 fs_info
->check_integrity_print_mask
= 0;
2593 btrfs_init_balance(fs_info
);
2594 btrfs_init_async_reclaim_work(&fs_info
->async_reclaim_work
);
2596 sb
->s_blocksize
= 4096;
2597 sb
->s_blocksize_bits
= blksize_bits(4096);
2598 sb
->s_bdi
= &fs_info
->bdi
;
2600 btrfs_init_btree_inode(fs_info
, tree_root
);
2602 spin_lock_init(&fs_info
->block_group_cache_lock
);
2603 fs_info
->block_group_cache_tree
= RB_ROOT
;
2604 fs_info
->first_logical_byte
= (u64
)-1;
2606 extent_io_tree_init(&fs_info
->freed_extents
[0],
2607 fs_info
->btree_inode
->i_mapping
);
2608 extent_io_tree_init(&fs_info
->freed_extents
[1],
2609 fs_info
->btree_inode
->i_mapping
);
2610 fs_info
->pinned_extents
= &fs_info
->freed_extents
[0];
2611 fs_info
->do_barriers
= 1;
2614 mutex_init(&fs_info
->ordered_operations_mutex
);
2615 mutex_init(&fs_info
->tree_log_mutex
);
2616 mutex_init(&fs_info
->chunk_mutex
);
2617 mutex_init(&fs_info
->transaction_kthread_mutex
);
2618 mutex_init(&fs_info
->cleaner_mutex
);
2619 mutex_init(&fs_info
->volume_mutex
);
2620 mutex_init(&fs_info
->ro_block_group_mutex
);
2621 init_rwsem(&fs_info
->commit_root_sem
);
2622 init_rwsem(&fs_info
->cleanup_work_sem
);
2623 init_rwsem(&fs_info
->subvol_sem
);
2624 sema_init(&fs_info
->uuid_tree_rescan_sem
, 1);
2626 btrfs_init_dev_replace_locks(fs_info
);
2627 btrfs_init_qgroup(fs_info
);
2629 btrfs_init_free_cluster(&fs_info
->meta_alloc_cluster
);
2630 btrfs_init_free_cluster(&fs_info
->data_alloc_cluster
);
2632 init_waitqueue_head(&fs_info
->transaction_throttle
);
2633 init_waitqueue_head(&fs_info
->transaction_wait
);
2634 init_waitqueue_head(&fs_info
->transaction_blocked_wait
);
2635 init_waitqueue_head(&fs_info
->async_submit_wait
);
2637 INIT_LIST_HEAD(&fs_info
->pinned_chunks
);
2639 ret
= btrfs_alloc_stripe_hash_table(fs_info
);
2645 __setup_root(4096, 4096, 4096, tree_root
,
2646 fs_info
, BTRFS_ROOT_TREE_OBJECTID
);
2648 invalidate_bdev(fs_devices
->latest_bdev
);
2651 * Read super block and check the signature bytes only
2653 bh
= btrfs_read_dev_super(fs_devices
->latest_bdev
);
2660 * We want to check superblock checksum, the type is stored inside.
2661 * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
2663 if (btrfs_check_super_csum(bh
->b_data
)) {
2664 printk(KERN_ERR
"BTRFS: superblock checksum mismatch\n");
2670 * super_copy is zeroed at allocation time and we never touch the
2671 * following bytes up to INFO_SIZE, the checksum is calculated from
2672 * the whole block of INFO_SIZE
2674 memcpy(fs_info
->super_copy
, bh
->b_data
, sizeof(*fs_info
->super_copy
));
2675 memcpy(fs_info
->super_for_commit
, fs_info
->super_copy
,
2676 sizeof(*fs_info
->super_for_commit
));
2679 memcpy(fs_info
->fsid
, fs_info
->super_copy
->fsid
, BTRFS_FSID_SIZE
);
2681 ret
= btrfs_check_super_valid(fs_info
, sb
->s_flags
& MS_RDONLY
);
2683 printk(KERN_ERR
"BTRFS: superblock contains fatal errors\n");
2688 disk_super
= fs_info
->super_copy
;
2689 if (!btrfs_super_root(disk_super
))
2692 /* check FS state, whether FS is broken. */
2693 if (btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_ERROR
)
2694 set_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
);
2697 * run through our array of backup supers and setup
2698 * our ring pointer to the oldest one
2700 generation
= btrfs_super_generation(disk_super
);
2701 find_oldest_super_backup(fs_info
, generation
);
2704 * In the long term, we'll store the compression type in the super
2705 * block, and it'll be used for per file compression control.
2707 fs_info
->compress_type
= BTRFS_COMPRESS_ZLIB
;
2709 ret
= btrfs_parse_options(tree_root
, options
);
2715 features
= btrfs_super_incompat_flags(disk_super
) &
2716 ~BTRFS_FEATURE_INCOMPAT_SUPP
;
2718 printk(KERN_ERR
"BTRFS: couldn't mount because of "
2719 "unsupported optional features (%Lx).\n",
2726 * Leafsize and nodesize were always equal, this is only a sanity check.
2728 if (le32_to_cpu(disk_super
->__unused_leafsize
) !=
2729 btrfs_super_nodesize(disk_super
)) {
2730 printk(KERN_ERR
"BTRFS: couldn't mount because metadata "
2731 "blocksizes don't match. node %d leaf %d\n",
2732 btrfs_super_nodesize(disk_super
),
2733 le32_to_cpu(disk_super
->__unused_leafsize
));
2737 if (btrfs_super_nodesize(disk_super
) > BTRFS_MAX_METADATA_BLOCKSIZE
) {
2738 printk(KERN_ERR
"BTRFS: couldn't mount because metadata "
2739 "blocksize (%d) was too large\n",
2740 btrfs_super_nodesize(disk_super
));
2745 features
= btrfs_super_incompat_flags(disk_super
);
2746 features
|= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
;
2747 if (tree_root
->fs_info
->compress_type
== BTRFS_COMPRESS_LZO
)
2748 features
|= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO
;
2750 if (features
& BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA
)
2751 printk(KERN_INFO
"BTRFS: has skinny extents\n");
2754 * flag our filesystem as having big metadata blocks if
2755 * they are bigger than the page size
2757 if (btrfs_super_nodesize(disk_super
) > PAGE_CACHE_SIZE
) {
2758 if (!(features
& BTRFS_FEATURE_INCOMPAT_BIG_METADATA
))
2759 printk(KERN_INFO
"BTRFS: flagging fs with big metadata feature\n");
2760 features
|= BTRFS_FEATURE_INCOMPAT_BIG_METADATA
;
2763 nodesize
= btrfs_super_nodesize(disk_super
);
2764 sectorsize
= btrfs_super_sectorsize(disk_super
);
2765 stripesize
= btrfs_super_stripesize(disk_super
);
2766 fs_info
->dirty_metadata_batch
= nodesize
* (1 + ilog2(nr_cpu_ids
));
2767 fs_info
->delalloc_batch
= sectorsize
* 512 * (1 + ilog2(nr_cpu_ids
));
2770 * mixed block groups end up with duplicate but slightly offset
2771 * extent buffers for the same range. It leads to corruptions
2773 if ((features
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
) &&
2774 (sectorsize
!= nodesize
)) {
2775 printk(KERN_ERR
"BTRFS: unequal leaf/node/sector sizes "
2776 "are not allowed for mixed block groups on %s\n",
2782 * Needn't use the lock because there is no other task which will
2785 btrfs_set_super_incompat_flags(disk_super
, features
);
2787 features
= btrfs_super_compat_ro_flags(disk_super
) &
2788 ~BTRFS_FEATURE_COMPAT_RO_SUPP
;
2789 if (!(sb
->s_flags
& MS_RDONLY
) && features
) {
2790 printk(KERN_ERR
"BTRFS: couldn't mount RDWR because of "
2791 "unsupported option features (%Lx).\n",
2797 max_active
= fs_info
->thread_pool_size
;
2799 ret
= btrfs_init_workqueues(fs_info
, fs_devices
);
2802 goto fail_sb_buffer
;
2805 fs_info
->bdi
.ra_pages
*= btrfs_super_num_devices(disk_super
);
2806 fs_info
->bdi
.ra_pages
= max(fs_info
->bdi
.ra_pages
,
2807 4 * 1024 * 1024 / PAGE_CACHE_SIZE
);
2809 tree_root
->nodesize
= nodesize
;
2810 tree_root
->sectorsize
= sectorsize
;
2811 tree_root
->stripesize
= stripesize
;
2813 sb
->s_blocksize
= sectorsize
;
2814 sb
->s_blocksize_bits
= blksize_bits(sectorsize
);
2816 if (btrfs_super_magic(disk_super
) != BTRFS_MAGIC
) {
2817 printk(KERN_ERR
"BTRFS: valid FS not found on %s\n", sb
->s_id
);
2818 goto fail_sb_buffer
;
2821 if (sectorsize
!= PAGE_SIZE
) {
2822 printk(KERN_ERR
"BTRFS: incompatible sector size (%lu) "
2823 "found on %s\n", (unsigned long)sectorsize
, sb
->s_id
);
2824 goto fail_sb_buffer
;
2827 mutex_lock(&fs_info
->chunk_mutex
);
2828 ret
= btrfs_read_sys_array(tree_root
);
2829 mutex_unlock(&fs_info
->chunk_mutex
);
2831 printk(KERN_ERR
"BTRFS: failed to read the system "
2832 "array on %s\n", sb
->s_id
);
2833 goto fail_sb_buffer
;
2836 generation
= btrfs_super_chunk_root_generation(disk_super
);
2838 __setup_root(nodesize
, sectorsize
, stripesize
, chunk_root
,
2839 fs_info
, BTRFS_CHUNK_TREE_OBJECTID
);
2841 chunk_root
->node
= read_tree_block(chunk_root
,
2842 btrfs_super_chunk_root(disk_super
),
2844 if (IS_ERR(chunk_root
->node
) ||
2845 !extent_buffer_uptodate(chunk_root
->node
)) {
2846 printk(KERN_ERR
"BTRFS: failed to read chunk root on %s\n",
2848 if (!IS_ERR(chunk_root
->node
))
2849 free_extent_buffer(chunk_root
->node
);
2850 chunk_root
->node
= NULL
;
2851 goto fail_tree_roots
;
2853 btrfs_set_root_node(&chunk_root
->root_item
, chunk_root
->node
);
2854 chunk_root
->commit_root
= btrfs_root_node(chunk_root
);
2856 read_extent_buffer(chunk_root
->node
, fs_info
->chunk_tree_uuid
,
2857 btrfs_header_chunk_tree_uuid(chunk_root
->node
), BTRFS_UUID_SIZE
);
2859 ret
= btrfs_read_chunk_tree(chunk_root
);
2861 printk(KERN_ERR
"BTRFS: failed to read chunk tree on %s\n",
2863 goto fail_tree_roots
;
2867 * keep the device that is marked to be the target device for the
2868 * dev_replace procedure
2870 btrfs_close_extra_devices(fs_devices
, 0);
2872 if (!fs_devices
->latest_bdev
) {
2873 printk(KERN_ERR
"BTRFS: failed to read devices on %s\n",
2875 goto fail_tree_roots
;
2879 generation
= btrfs_super_generation(disk_super
);
2881 tree_root
->node
= read_tree_block(tree_root
,
2882 btrfs_super_root(disk_super
),
2884 if (IS_ERR(tree_root
->node
) ||
2885 !extent_buffer_uptodate(tree_root
->node
)) {
2886 printk(KERN_WARNING
"BTRFS: failed to read tree root on %s\n",
2888 if (!IS_ERR(tree_root
->node
))
2889 free_extent_buffer(tree_root
->node
);
2890 tree_root
->node
= NULL
;
2891 goto recovery_tree_root
;
2894 btrfs_set_root_node(&tree_root
->root_item
, tree_root
->node
);
2895 tree_root
->commit_root
= btrfs_root_node(tree_root
);
2896 btrfs_set_root_refs(&tree_root
->root_item
, 1);
2898 ret
= btrfs_read_roots(fs_info
, tree_root
);
2900 goto recovery_tree_root
;
2902 fs_info
->generation
= generation
;
2903 fs_info
->last_trans_committed
= generation
;
2905 ret
= btrfs_recover_balance(fs_info
);
2907 printk(KERN_ERR
"BTRFS: failed to recover balance\n");
2908 goto fail_block_groups
;
2911 ret
= btrfs_init_dev_stats(fs_info
);
2913 printk(KERN_ERR
"BTRFS: failed to init dev_stats: %d\n",
2915 goto fail_block_groups
;
2918 ret
= btrfs_init_dev_replace(fs_info
);
2920 pr_err("BTRFS: failed to init dev_replace: %d\n", ret
);
2921 goto fail_block_groups
;
2924 btrfs_close_extra_devices(fs_devices
, 1);
2926 ret
= btrfs_sysfs_add_fsid(fs_devices
, NULL
);
2928 pr_err("BTRFS: failed to init sysfs fsid interface: %d\n", ret
);
2929 goto fail_block_groups
;
2932 ret
= btrfs_sysfs_add_device(fs_devices
);
2934 pr_err("BTRFS: failed to init sysfs device interface: %d\n", ret
);
2935 goto fail_fsdev_sysfs
;
2938 ret
= btrfs_sysfs_add_one(fs_info
);
2940 pr_err("BTRFS: failed to init sysfs interface: %d\n", ret
);
2941 goto fail_fsdev_sysfs
;
2944 ret
= btrfs_init_space_info(fs_info
);
2946 printk(KERN_ERR
"BTRFS: Failed to initial space info: %d\n", ret
);
2950 ret
= btrfs_read_block_groups(fs_info
->extent_root
);
2952 printk(KERN_ERR
"BTRFS: Failed to read block groups: %d\n", ret
);
2955 fs_info
->num_tolerated_disk_barrier_failures
=
2956 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info
);
2957 if (fs_info
->fs_devices
->missing_devices
>
2958 fs_info
->num_tolerated_disk_barrier_failures
&&
2959 !(sb
->s_flags
& MS_RDONLY
)) {
2960 pr_warn("BTRFS: missing devices(%llu) exceeds the limit(%d), writeable mount is not allowed\n",
2961 fs_info
->fs_devices
->missing_devices
,
2962 fs_info
->num_tolerated_disk_barrier_failures
);
2966 fs_info
->cleaner_kthread
= kthread_run(cleaner_kthread
, tree_root
,
2968 if (IS_ERR(fs_info
->cleaner_kthread
))
2971 fs_info
->transaction_kthread
= kthread_run(transaction_kthread
,
2973 "btrfs-transaction");
2974 if (IS_ERR(fs_info
->transaction_kthread
))
2977 if (!btrfs_test_opt(tree_root
, SSD
) &&
2978 !btrfs_test_opt(tree_root
, NOSSD
) &&
2979 !fs_info
->fs_devices
->rotating
) {
2980 printk(KERN_INFO
"BTRFS: detected SSD devices, enabling SSD "
2982 btrfs_set_opt(fs_info
->mount_opt
, SSD
);
2986 * Mount does not set all options immediatelly, we can do it now and do
2987 * not have to wait for transaction commit
2989 btrfs_apply_pending_changes(fs_info
);
2991 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2992 if (btrfs_test_opt(tree_root
, CHECK_INTEGRITY
)) {
2993 ret
= btrfsic_mount(tree_root
, fs_devices
,
2994 btrfs_test_opt(tree_root
,
2995 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA
) ?
2997 fs_info
->check_integrity_print_mask
);
2999 printk(KERN_WARNING
"BTRFS: failed to initialize"
3000 " integrity check module %s\n", sb
->s_id
);
3003 ret
= btrfs_read_qgroup_config(fs_info
);
3005 goto fail_trans_kthread
;
3007 /* do not make disk changes in broken FS */
3008 if (btrfs_super_log_root(disk_super
) != 0) {
3009 ret
= btrfs_replay_log(fs_info
, fs_devices
);
3016 ret
= btrfs_find_orphan_roots(tree_root
);
3020 if (!(sb
->s_flags
& MS_RDONLY
)) {
3021 ret
= btrfs_cleanup_fs_roots(fs_info
);
3025 mutex_lock(&fs_info
->cleaner_mutex
);
3026 ret
= btrfs_recover_relocation(tree_root
);
3027 mutex_unlock(&fs_info
->cleaner_mutex
);
3030 "BTRFS: failed to recover relocation\n");
3036 location
.objectid
= BTRFS_FS_TREE_OBJECTID
;
3037 location
.type
= BTRFS_ROOT_ITEM_KEY
;
3038 location
.offset
= 0;
3040 fs_info
->fs_root
= btrfs_read_fs_root_no_name(fs_info
, &location
);
3041 if (IS_ERR(fs_info
->fs_root
)) {
3042 err
= PTR_ERR(fs_info
->fs_root
);
3046 if (sb
->s_flags
& MS_RDONLY
)
3049 down_read(&fs_info
->cleanup_work_sem
);
3050 if ((ret
= btrfs_orphan_cleanup(fs_info
->fs_root
)) ||
3051 (ret
= btrfs_orphan_cleanup(fs_info
->tree_root
))) {
3052 up_read(&fs_info
->cleanup_work_sem
);
3053 close_ctree(tree_root
);
3056 up_read(&fs_info
->cleanup_work_sem
);
3058 ret
= btrfs_resume_balance_async(fs_info
);
3060 printk(KERN_WARNING
"BTRFS: failed to resume balance\n");
3061 close_ctree(tree_root
);
3065 ret
= btrfs_resume_dev_replace_async(fs_info
);
3067 pr_warn("BTRFS: failed to resume dev_replace\n");
3068 close_ctree(tree_root
);
3072 btrfs_qgroup_rescan_resume(fs_info
);
3074 if (!fs_info
->uuid_root
) {
3075 pr_info("BTRFS: creating UUID tree\n");
3076 ret
= btrfs_create_uuid_tree(fs_info
);
3078 pr_warn("BTRFS: failed to create the UUID tree %d\n",
3080 close_ctree(tree_root
);
3083 } else if (btrfs_test_opt(tree_root
, RESCAN_UUID_TREE
) ||
3084 fs_info
->generation
!=
3085 btrfs_super_uuid_tree_generation(disk_super
)) {
3086 pr_info("BTRFS: checking UUID tree\n");
3087 ret
= btrfs_check_uuid_tree(fs_info
);
3089 pr_warn("BTRFS: failed to check the UUID tree %d\n",
3091 close_ctree(tree_root
);
3095 fs_info
->update_uuid_tree_gen
= 1;
3103 btrfs_free_qgroup_config(fs_info
);
3105 kthread_stop(fs_info
->transaction_kthread
);
3106 btrfs_cleanup_transaction(fs_info
->tree_root
);
3107 btrfs_free_fs_roots(fs_info
);
3109 kthread_stop(fs_info
->cleaner_kthread
);
3112 * make sure we're done with the btree inode before we stop our
3115 filemap_write_and_wait(fs_info
->btree_inode
->i_mapping
);
3118 btrfs_sysfs_remove_one(fs_info
);
3121 btrfs_sysfs_remove_fsid(fs_info
->fs_devices
);
3124 btrfs_put_block_group_cache(fs_info
);
3125 btrfs_free_block_groups(fs_info
);
3128 free_root_pointers(fs_info
, 1);
3129 invalidate_inode_pages2(fs_info
->btree_inode
->i_mapping
);
3132 btrfs_stop_all_workers(fs_info
);
3135 btrfs_mapping_tree_free(&fs_info
->mapping_tree
);
3137 iput(fs_info
->btree_inode
);
3139 percpu_counter_destroy(&fs_info
->bio_counter
);
3140 fail_delalloc_bytes
:
3141 percpu_counter_destroy(&fs_info
->delalloc_bytes
);
3142 fail_dirty_metadata_bytes
:
3143 percpu_counter_destroy(&fs_info
->dirty_metadata_bytes
);
3145 bdi_destroy(&fs_info
->bdi
);
3147 cleanup_srcu_struct(&fs_info
->subvol_srcu
);
3149 btrfs_free_stripe_hash_table(fs_info
);
3150 btrfs_close_devices(fs_info
->fs_devices
);
3154 if (!btrfs_test_opt(tree_root
, RECOVERY
))
3155 goto fail_tree_roots
;
3157 free_root_pointers(fs_info
, 0);
3159 /* don't use the log in recovery mode, it won't be valid */
3160 btrfs_set_super_log_root(disk_super
, 0);
3162 /* we can't trust the free space cache either */
3163 btrfs_set_opt(fs_info
->mount_opt
, CLEAR_CACHE
);
3165 ret
= next_root_backup(fs_info
, fs_info
->super_copy
,
3166 &num_backups_tried
, &backup_index
);
3168 goto fail_block_groups
;
3169 goto retry_root_backup
;
3172 static void btrfs_end_buffer_write_sync(struct buffer_head
*bh
, int uptodate
)
3175 set_buffer_uptodate(bh
);
3177 struct btrfs_device
*device
= (struct btrfs_device
*)
3180 btrfs_warn_rl_in_rcu(device
->dev_root
->fs_info
,
3181 "lost page write due to IO error on %s",
3182 rcu_str_deref(device
->name
));
3183 /* note, we dont' set_buffer_write_io_error because we have
3184 * our own ways of dealing with the IO errors
3186 clear_buffer_uptodate(bh
);
3187 btrfs_dev_stat_inc_and_print(device
, BTRFS_DEV_STAT_WRITE_ERRS
);
3193 struct buffer_head
*btrfs_read_dev_super(struct block_device
*bdev
)
3195 struct buffer_head
*bh
;
3196 struct buffer_head
*latest
= NULL
;
3197 struct btrfs_super_block
*super
;
3202 /* we would like to check all the supers, but that would make
3203 * a btrfs mount succeed after a mkfs from a different FS.
3204 * So, we need to add a special mount option to scan for
3205 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
3207 for (i
= 0; i
< 1; i
++) {
3208 bytenr
= btrfs_sb_offset(i
);
3209 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
>=
3210 i_size_read(bdev
->bd_inode
))
3212 bh
= __bread(bdev
, bytenr
/ 4096,
3213 BTRFS_SUPER_INFO_SIZE
);
3217 super
= (struct btrfs_super_block
*)bh
->b_data
;
3218 if (btrfs_super_bytenr(super
) != bytenr
||
3219 btrfs_super_magic(super
) != BTRFS_MAGIC
) {
3224 if (!latest
|| btrfs_super_generation(super
) > transid
) {
3227 transid
= btrfs_super_generation(super
);
3236 * this should be called twice, once with wait == 0 and
3237 * once with wait == 1. When wait == 0 is done, all the buffer heads
3238 * we write are pinned.
3240 * They are released when wait == 1 is done.
3241 * max_mirrors must be the same for both runs, and it indicates how
3242 * many supers on this one device should be written.
3244 * max_mirrors == 0 means to write them all.
3246 static int write_dev_supers(struct btrfs_device
*device
,
3247 struct btrfs_super_block
*sb
,
3248 int do_barriers
, int wait
, int max_mirrors
)
3250 struct buffer_head
*bh
;
3257 if (max_mirrors
== 0)
3258 max_mirrors
= BTRFS_SUPER_MIRROR_MAX
;
3260 for (i
= 0; i
< max_mirrors
; i
++) {
3261 bytenr
= btrfs_sb_offset(i
);
3262 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
>=
3263 device
->commit_total_bytes
)
3267 bh
= __find_get_block(device
->bdev
, bytenr
/ 4096,
3268 BTRFS_SUPER_INFO_SIZE
);
3274 if (!buffer_uptodate(bh
))
3277 /* drop our reference */
3280 /* drop the reference from the wait == 0 run */
3284 btrfs_set_super_bytenr(sb
, bytenr
);
3287 crc
= btrfs_csum_data((char *)sb
+
3288 BTRFS_CSUM_SIZE
, crc
,
3289 BTRFS_SUPER_INFO_SIZE
-
3291 btrfs_csum_final(crc
, sb
->csum
);
3294 * one reference for us, and we leave it for the
3297 bh
= __getblk(device
->bdev
, bytenr
/ 4096,
3298 BTRFS_SUPER_INFO_SIZE
);
3300 btrfs_err(device
->dev_root
->fs_info
,
3301 "couldn't get super buffer head for bytenr %llu",
3307 memcpy(bh
->b_data
, sb
, BTRFS_SUPER_INFO_SIZE
);
3309 /* one reference for submit_bh */
3312 set_buffer_uptodate(bh
);
3314 bh
->b_end_io
= btrfs_end_buffer_write_sync
;
3315 bh
->b_private
= device
;
3319 * we fua the first super. The others we allow
3323 ret
= btrfsic_submit_bh(WRITE_FUA
, bh
);
3325 ret
= btrfsic_submit_bh(WRITE_SYNC
, bh
);
3329 return errors
< i
? 0 : -1;
3333 * endio for the write_dev_flush, this will wake anyone waiting
3334 * for the barrier when it is done
3336 static void btrfs_end_empty_barrier(struct bio
*bio
)
3338 if (bio
->bi_private
)
3339 complete(bio
->bi_private
);
3344 * trigger flushes for one the devices. If you pass wait == 0, the flushes are
3345 * sent down. With wait == 1, it waits for the previous flush.
3347 * any device where the flush fails with eopnotsupp are flagged as not-barrier
3350 static int write_dev_flush(struct btrfs_device
*device
, int wait
)
3355 if (device
->nobarriers
)
3359 bio
= device
->flush_bio
;
3363 wait_for_completion(&device
->flush_wait
);
3365 if (bio
->bi_error
) {
3366 ret
= bio
->bi_error
;
3367 btrfs_dev_stat_inc_and_print(device
,
3368 BTRFS_DEV_STAT_FLUSH_ERRS
);
3371 /* drop the reference from the wait == 0 run */
3373 device
->flush_bio
= NULL
;
3379 * one reference for us, and we leave it for the
3382 device
->flush_bio
= NULL
;
3383 bio
= btrfs_io_bio_alloc(GFP_NOFS
, 0);
3387 bio
->bi_end_io
= btrfs_end_empty_barrier
;
3388 bio
->bi_bdev
= device
->bdev
;
3389 init_completion(&device
->flush_wait
);
3390 bio
->bi_private
= &device
->flush_wait
;
3391 device
->flush_bio
= bio
;
3394 btrfsic_submit_bio(WRITE_FLUSH
, bio
);
3400 * send an empty flush down to each device in parallel,
3401 * then wait for them
3403 static int barrier_all_devices(struct btrfs_fs_info
*info
)
3405 struct list_head
*head
;
3406 struct btrfs_device
*dev
;
3407 int errors_send
= 0;
3408 int errors_wait
= 0;
3411 /* send down all the barriers */
3412 head
= &info
->fs_devices
->devices
;
3413 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3420 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3423 ret
= write_dev_flush(dev
, 0);
3428 /* wait for all the barriers */
3429 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3436 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3439 ret
= write_dev_flush(dev
, 1);
3443 if (errors_send
> info
->num_tolerated_disk_barrier_failures
||
3444 errors_wait
> info
->num_tolerated_disk_barrier_failures
)
3449 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags
)
3451 if ((flags
& (BTRFS_BLOCK_GROUP_DUP
|
3452 BTRFS_BLOCK_GROUP_RAID0
|
3453 BTRFS_AVAIL_ALLOC_BIT_SINGLE
)) ||
3454 ((flags
& BTRFS_BLOCK_GROUP_PROFILE_MASK
) == 0))
3457 if (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
3458 BTRFS_BLOCK_GROUP_RAID5
|
3459 BTRFS_BLOCK_GROUP_RAID10
))
3462 if (flags
& BTRFS_BLOCK_GROUP_RAID6
)
3465 pr_warn("BTRFS: unknown raid type: %llu\n", flags
);
3469 int btrfs_calc_num_tolerated_disk_barrier_failures(
3470 struct btrfs_fs_info
*fs_info
)
3472 struct btrfs_ioctl_space_info space
;
3473 struct btrfs_space_info
*sinfo
;
3474 u64 types
[] = {BTRFS_BLOCK_GROUP_DATA
,
3475 BTRFS_BLOCK_GROUP_SYSTEM
,
3476 BTRFS_BLOCK_GROUP_METADATA
,
3477 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
};
3480 int num_tolerated_disk_barrier_failures
=
3481 (int)fs_info
->fs_devices
->num_devices
;
3483 for (i
= 0; i
< ARRAY_SIZE(types
); i
++) {
3484 struct btrfs_space_info
*tmp
;
3488 list_for_each_entry_rcu(tmp
, &fs_info
->space_info
, list
) {
3489 if (tmp
->flags
== types
[i
]) {
3499 down_read(&sinfo
->groups_sem
);
3500 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3503 if (list_empty(&sinfo
->block_groups
[c
]))
3506 btrfs_get_block_group_info(&sinfo
->block_groups
[c
],
3508 if (space
.total_bytes
== 0 || space
.used_bytes
== 0)
3510 flags
= space
.flags
;
3512 num_tolerated_disk_barrier_failures
= min(
3513 num_tolerated_disk_barrier_failures
,
3514 btrfs_get_num_tolerated_disk_barrier_failures(
3517 up_read(&sinfo
->groups_sem
);
3520 return num_tolerated_disk_barrier_failures
;
3523 static int write_all_supers(struct btrfs_root
*root
, int max_mirrors
)
3525 struct list_head
*head
;
3526 struct btrfs_device
*dev
;
3527 struct btrfs_super_block
*sb
;
3528 struct btrfs_dev_item
*dev_item
;
3532 int total_errors
= 0;
3535 do_barriers
= !btrfs_test_opt(root
, NOBARRIER
);
3536 backup_super_roots(root
->fs_info
);
3538 sb
= root
->fs_info
->super_for_commit
;
3539 dev_item
= &sb
->dev_item
;
3541 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
3542 head
= &root
->fs_info
->fs_devices
->devices
;
3543 max_errors
= btrfs_super_num_devices(root
->fs_info
->super_copy
) - 1;
3546 ret
= barrier_all_devices(root
->fs_info
);
3549 &root
->fs_info
->fs_devices
->device_list_mutex
);
3550 btrfs_error(root
->fs_info
, ret
,
3551 "errors while submitting device barriers.");
3556 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3561 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3564 btrfs_set_stack_device_generation(dev_item
, 0);
3565 btrfs_set_stack_device_type(dev_item
, dev
->type
);
3566 btrfs_set_stack_device_id(dev_item
, dev
->devid
);
3567 btrfs_set_stack_device_total_bytes(dev_item
,
3568 dev
->commit_total_bytes
);
3569 btrfs_set_stack_device_bytes_used(dev_item
,
3570 dev
->commit_bytes_used
);
3571 btrfs_set_stack_device_io_align(dev_item
, dev
->io_align
);
3572 btrfs_set_stack_device_io_width(dev_item
, dev
->io_width
);
3573 btrfs_set_stack_device_sector_size(dev_item
, dev
->sector_size
);
3574 memcpy(dev_item
->uuid
, dev
->uuid
, BTRFS_UUID_SIZE
);
3575 memcpy(dev_item
->fsid
, dev
->fs_devices
->fsid
, BTRFS_UUID_SIZE
);
3577 flags
= btrfs_super_flags(sb
);
3578 btrfs_set_super_flags(sb
, flags
| BTRFS_HEADER_FLAG_WRITTEN
);
3580 ret
= write_dev_supers(dev
, sb
, do_barriers
, 0, max_mirrors
);
3584 if (total_errors
> max_errors
) {
3585 btrfs_err(root
->fs_info
, "%d errors while writing supers",
3587 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
3589 /* FUA is masked off if unsupported and can't be the reason */
3590 btrfs_error(root
->fs_info
, -EIO
,
3591 "%d errors while writing supers", total_errors
);
3596 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3599 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3602 ret
= write_dev_supers(dev
, sb
, do_barriers
, 1, max_mirrors
);
3606 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
3607 if (total_errors
> max_errors
) {
3608 btrfs_error(root
->fs_info
, -EIO
,
3609 "%d errors while writing supers", total_errors
);
3615 int write_ctree_super(struct btrfs_trans_handle
*trans
,
3616 struct btrfs_root
*root
, int max_mirrors
)
3618 return write_all_supers(root
, max_mirrors
);
3621 /* Drop a fs root from the radix tree and free it. */
3622 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info
*fs_info
,
3623 struct btrfs_root
*root
)
3625 spin_lock(&fs_info
->fs_roots_radix_lock
);
3626 radix_tree_delete(&fs_info
->fs_roots_radix
,
3627 (unsigned long)root
->root_key
.objectid
);
3628 spin_unlock(&fs_info
->fs_roots_radix_lock
);
3630 if (btrfs_root_refs(&root
->root_item
) == 0)
3631 synchronize_srcu(&fs_info
->subvol_srcu
);
3633 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
3634 btrfs_free_log(NULL
, root
);
3636 if (root
->free_ino_pinned
)
3637 __btrfs_remove_free_space_cache(root
->free_ino_pinned
);
3638 if (root
->free_ino_ctl
)
3639 __btrfs_remove_free_space_cache(root
->free_ino_ctl
);
3643 static void free_fs_root(struct btrfs_root
*root
)
3645 iput(root
->ino_cache_inode
);
3646 WARN_ON(!RB_EMPTY_ROOT(&root
->inode_tree
));
3647 btrfs_free_block_rsv(root
, root
->orphan_block_rsv
);
3648 root
->orphan_block_rsv
= NULL
;
3650 free_anon_bdev(root
->anon_dev
);
3651 if (root
->subv_writers
)
3652 btrfs_free_subvolume_writers(root
->subv_writers
);
3653 free_extent_buffer(root
->node
);
3654 free_extent_buffer(root
->commit_root
);
3655 kfree(root
->free_ino_ctl
);
3656 kfree(root
->free_ino_pinned
);
3658 btrfs_put_fs_root(root
);
3661 void btrfs_free_fs_root(struct btrfs_root
*root
)
3666 int btrfs_cleanup_fs_roots(struct btrfs_fs_info
*fs_info
)
3668 u64 root_objectid
= 0;
3669 struct btrfs_root
*gang
[8];
3672 unsigned int ret
= 0;
3676 index
= srcu_read_lock(&fs_info
->subvol_srcu
);
3677 ret
= radix_tree_gang_lookup(&fs_info
->fs_roots_radix
,
3678 (void **)gang
, root_objectid
,
3681 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
3684 root_objectid
= gang
[ret
- 1]->root_key
.objectid
+ 1;
3686 for (i
= 0; i
< ret
; i
++) {
3687 /* Avoid to grab roots in dead_roots */
3688 if (btrfs_root_refs(&gang
[i
]->root_item
) == 0) {
3692 /* grab all the search result for later use */
3693 gang
[i
] = btrfs_grab_fs_root(gang
[i
]);
3695 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
3697 for (i
= 0; i
< ret
; i
++) {
3700 root_objectid
= gang
[i
]->root_key
.objectid
;
3701 err
= btrfs_orphan_cleanup(gang
[i
]);
3704 btrfs_put_fs_root(gang
[i
]);
3709 /* release the uncleaned roots due to error */
3710 for (; i
< ret
; i
++) {
3712 btrfs_put_fs_root(gang
[i
]);
3717 int btrfs_commit_super(struct btrfs_root
*root
)
3719 struct btrfs_trans_handle
*trans
;
3721 mutex_lock(&root
->fs_info
->cleaner_mutex
);
3722 btrfs_run_delayed_iputs(root
);
3723 mutex_unlock(&root
->fs_info
->cleaner_mutex
);
3724 wake_up_process(root
->fs_info
->cleaner_kthread
);
3726 /* wait until ongoing cleanup work done */
3727 down_write(&root
->fs_info
->cleanup_work_sem
);
3728 up_write(&root
->fs_info
->cleanup_work_sem
);
3730 trans
= btrfs_join_transaction(root
);
3732 return PTR_ERR(trans
);
3733 return btrfs_commit_transaction(trans
, root
);
3736 void close_ctree(struct btrfs_root
*root
)
3738 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3741 fs_info
->closing
= 1;
3744 /* wait for the uuid_scan task to finish */
3745 down(&fs_info
->uuid_tree_rescan_sem
);
3746 /* avoid complains from lockdep et al., set sem back to initial state */
3747 up(&fs_info
->uuid_tree_rescan_sem
);
3749 /* pause restriper - we want to resume on mount */
3750 btrfs_pause_balance(fs_info
);
3752 btrfs_dev_replace_suspend_for_unmount(fs_info
);
3754 btrfs_scrub_cancel(fs_info
);
3756 /* wait for any defraggers to finish */
3757 wait_event(fs_info
->transaction_wait
,
3758 (atomic_read(&fs_info
->defrag_running
) == 0));
3760 /* clear out the rbtree of defraggable inodes */
3761 btrfs_cleanup_defrag_inodes(fs_info
);
3763 cancel_work_sync(&fs_info
->async_reclaim_work
);
3765 if (!(fs_info
->sb
->s_flags
& MS_RDONLY
)) {
3767 * If the cleaner thread is stopped and there are
3768 * block groups queued for removal, the deletion will be
3769 * skipped when we quit the cleaner thread.
3771 btrfs_delete_unused_bgs(root
->fs_info
);
3773 ret
= btrfs_commit_super(root
);
3775 btrfs_err(fs_info
, "commit super ret %d", ret
);
3778 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
3779 btrfs_error_commit_super(root
);
3781 kthread_stop(fs_info
->transaction_kthread
);
3782 kthread_stop(fs_info
->cleaner_kthread
);
3784 fs_info
->closing
= 2;
3787 btrfs_free_qgroup_config(fs_info
);
3789 if (percpu_counter_sum(&fs_info
->delalloc_bytes
)) {
3790 btrfs_info(fs_info
, "at unmount delalloc count %lld",
3791 percpu_counter_sum(&fs_info
->delalloc_bytes
));
3794 btrfs_sysfs_remove_one(fs_info
);
3795 btrfs_sysfs_remove_fsid(fs_info
->fs_devices
);
3797 btrfs_free_fs_roots(fs_info
);
3799 btrfs_put_block_group_cache(fs_info
);
3801 btrfs_free_block_groups(fs_info
);
3804 * we must make sure there is not any read request to
3805 * submit after we stopping all workers.
3807 invalidate_inode_pages2(fs_info
->btree_inode
->i_mapping
);
3808 btrfs_stop_all_workers(fs_info
);
3811 free_root_pointers(fs_info
, 1);
3813 iput(fs_info
->btree_inode
);
3815 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3816 if (btrfs_test_opt(root
, CHECK_INTEGRITY
))
3817 btrfsic_unmount(root
, fs_info
->fs_devices
);
3820 btrfs_close_devices(fs_info
->fs_devices
);
3821 btrfs_mapping_tree_free(&fs_info
->mapping_tree
);
3823 percpu_counter_destroy(&fs_info
->dirty_metadata_bytes
);
3824 percpu_counter_destroy(&fs_info
->delalloc_bytes
);
3825 percpu_counter_destroy(&fs_info
->bio_counter
);
3826 bdi_destroy(&fs_info
->bdi
);
3827 cleanup_srcu_struct(&fs_info
->subvol_srcu
);
3829 btrfs_free_stripe_hash_table(fs_info
);
3831 __btrfs_free_block_rsv(root
->orphan_block_rsv
);
3832 root
->orphan_block_rsv
= NULL
;
3835 while (!list_empty(&fs_info
->pinned_chunks
)) {
3836 struct extent_map
*em
;
3838 em
= list_first_entry(&fs_info
->pinned_chunks
,
3839 struct extent_map
, list
);
3840 list_del_init(&em
->list
);
3841 free_extent_map(em
);
3843 unlock_chunks(root
);
3846 int btrfs_buffer_uptodate(struct extent_buffer
*buf
, u64 parent_transid
,
3850 struct inode
*btree_inode
= buf
->pages
[0]->mapping
->host
;
3852 ret
= extent_buffer_uptodate(buf
);
3856 ret
= verify_parent_transid(&BTRFS_I(btree_inode
)->io_tree
, buf
,
3857 parent_transid
, atomic
);
3863 int btrfs_set_buffer_uptodate(struct extent_buffer
*buf
)
3865 return set_extent_buffer_uptodate(buf
);
3868 void btrfs_mark_buffer_dirty(struct extent_buffer
*buf
)
3870 struct btrfs_root
*root
;
3871 u64 transid
= btrfs_header_generation(buf
);
3874 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3876 * This is a fast path so only do this check if we have sanity tests
3877 * enabled. Normal people shouldn't be marking dummy buffers as dirty
3878 * outside of the sanity tests.
3880 if (unlikely(test_bit(EXTENT_BUFFER_DUMMY
, &buf
->bflags
)))
3883 root
= BTRFS_I(buf
->pages
[0]->mapping
->host
)->root
;
3884 btrfs_assert_tree_locked(buf
);
3885 if (transid
!= root
->fs_info
->generation
)
3886 WARN(1, KERN_CRIT
"btrfs transid mismatch buffer %llu, "
3887 "found %llu running %llu\n",
3888 buf
->start
, transid
, root
->fs_info
->generation
);
3889 was_dirty
= set_extent_buffer_dirty(buf
);
3891 __percpu_counter_add(&root
->fs_info
->dirty_metadata_bytes
,
3893 root
->fs_info
->dirty_metadata_batch
);
3894 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3895 if (btrfs_header_level(buf
) == 0 && check_leaf(root
, buf
)) {
3896 btrfs_print_leaf(root
, buf
);
3902 static void __btrfs_btree_balance_dirty(struct btrfs_root
*root
,
3906 * looks as though older kernels can get into trouble with
3907 * this code, they end up stuck in balance_dirty_pages forever
3911 if (current
->flags
& PF_MEMALLOC
)
3915 btrfs_balance_delayed_items(root
);
3917 ret
= percpu_counter_compare(&root
->fs_info
->dirty_metadata_bytes
,
3918 BTRFS_DIRTY_METADATA_THRESH
);
3920 balance_dirty_pages_ratelimited(
3921 root
->fs_info
->btree_inode
->i_mapping
);
3926 void btrfs_btree_balance_dirty(struct btrfs_root
*root
)
3928 __btrfs_btree_balance_dirty(root
, 1);
3931 void btrfs_btree_balance_dirty_nodelay(struct btrfs_root
*root
)
3933 __btrfs_btree_balance_dirty(root
, 0);
3936 int btrfs_read_buffer(struct extent_buffer
*buf
, u64 parent_transid
)
3938 struct btrfs_root
*root
= BTRFS_I(buf
->pages
[0]->mapping
->host
)->root
;
3939 return btree_read_extent_buffer_pages(root
, buf
, 0, parent_transid
);
3942 static int btrfs_check_super_valid(struct btrfs_fs_info
*fs_info
,
3945 struct btrfs_super_block
*sb
= fs_info
->super_copy
;
3948 if (btrfs_super_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
3949 printk(KERN_ERR
"BTRFS: tree_root level too big: %d >= %d\n",
3950 btrfs_super_root_level(sb
), BTRFS_MAX_LEVEL
);
3953 if (btrfs_super_chunk_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
3954 printk(KERN_ERR
"BTRFS: chunk_root level too big: %d >= %d\n",
3955 btrfs_super_chunk_root_level(sb
), BTRFS_MAX_LEVEL
);
3958 if (btrfs_super_log_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
3959 printk(KERN_ERR
"BTRFS: log_root level too big: %d >= %d\n",
3960 btrfs_super_log_root_level(sb
), BTRFS_MAX_LEVEL
);
3965 * The common minimum, we don't know if we can trust the nodesize/sectorsize
3966 * items yet, they'll be verified later. Issue just a warning.
3968 if (!IS_ALIGNED(btrfs_super_root(sb
), 4096))
3969 printk(KERN_WARNING
"BTRFS: tree_root block unaligned: %llu\n",
3970 btrfs_super_root(sb
));
3971 if (!IS_ALIGNED(btrfs_super_chunk_root(sb
), 4096))
3972 printk(KERN_WARNING
"BTRFS: chunk_root block unaligned: %llu\n",
3973 btrfs_super_chunk_root(sb
));
3974 if (!IS_ALIGNED(btrfs_super_log_root(sb
), 4096))
3975 printk(KERN_WARNING
"BTRFS: log_root block unaligned: %llu\n",
3976 btrfs_super_log_root(sb
));
3979 * Check the lower bound, the alignment and other constraints are
3982 if (btrfs_super_nodesize(sb
) < 4096) {
3983 printk(KERN_ERR
"BTRFS: nodesize too small: %u < 4096\n",
3984 btrfs_super_nodesize(sb
));
3987 if (btrfs_super_sectorsize(sb
) < 4096) {
3988 printk(KERN_ERR
"BTRFS: sectorsize too small: %u < 4096\n",
3989 btrfs_super_sectorsize(sb
));
3993 if (memcmp(fs_info
->fsid
, sb
->dev_item
.fsid
, BTRFS_UUID_SIZE
) != 0) {
3994 printk(KERN_ERR
"BTRFS: dev_item UUID does not match fsid: %pU != %pU\n",
3995 fs_info
->fsid
, sb
->dev_item
.fsid
);
4000 * Hint to catch really bogus numbers, bitflips or so, more exact checks are
4003 if (btrfs_super_num_devices(sb
) > (1UL << 31))
4004 printk(KERN_WARNING
"BTRFS: suspicious number of devices: %llu\n",
4005 btrfs_super_num_devices(sb
));
4006 if (btrfs_super_num_devices(sb
) == 0) {
4007 printk(KERN_ERR
"BTRFS: number of devices is 0\n");
4011 if (btrfs_super_bytenr(sb
) != BTRFS_SUPER_INFO_OFFSET
) {
4012 printk(KERN_ERR
"BTRFS: super offset mismatch %llu != %u\n",
4013 btrfs_super_bytenr(sb
), BTRFS_SUPER_INFO_OFFSET
);
4018 * Obvious sys_chunk_array corruptions, it must hold at least one key
4021 if (btrfs_super_sys_array_size(sb
) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
) {
4022 printk(KERN_ERR
"BTRFS: system chunk array too big %u > %u\n",
4023 btrfs_super_sys_array_size(sb
),
4024 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
);
4027 if (btrfs_super_sys_array_size(sb
) < sizeof(struct btrfs_disk_key
)
4028 + sizeof(struct btrfs_chunk
)) {
4029 printk(KERN_ERR
"BTRFS: system chunk array too small %u < %zu\n",
4030 btrfs_super_sys_array_size(sb
),
4031 sizeof(struct btrfs_disk_key
)
4032 + sizeof(struct btrfs_chunk
));
4037 * The generation is a global counter, we'll trust it more than the others
4038 * but it's still possible that it's the one that's wrong.
4040 if (btrfs_super_generation(sb
) < btrfs_super_chunk_root_generation(sb
))
4042 "BTRFS: suspicious: generation < chunk_root_generation: %llu < %llu\n",
4043 btrfs_super_generation(sb
), btrfs_super_chunk_root_generation(sb
));
4044 if (btrfs_super_generation(sb
) < btrfs_super_cache_generation(sb
)
4045 && btrfs_super_cache_generation(sb
) != (u64
)-1)
4047 "BTRFS: suspicious: generation < cache_generation: %llu < %llu\n",
4048 btrfs_super_generation(sb
), btrfs_super_cache_generation(sb
));
4053 static void btrfs_error_commit_super(struct btrfs_root
*root
)
4055 mutex_lock(&root
->fs_info
->cleaner_mutex
);
4056 btrfs_run_delayed_iputs(root
);
4057 mutex_unlock(&root
->fs_info
->cleaner_mutex
);
4059 down_write(&root
->fs_info
->cleanup_work_sem
);
4060 up_write(&root
->fs_info
->cleanup_work_sem
);
4062 /* cleanup FS via transaction */
4063 btrfs_cleanup_transaction(root
);
4066 static void btrfs_destroy_ordered_extents(struct btrfs_root
*root
)
4068 struct btrfs_ordered_extent
*ordered
;
4070 spin_lock(&root
->ordered_extent_lock
);
4072 * This will just short circuit the ordered completion stuff which will
4073 * make sure the ordered extent gets properly cleaned up.
4075 list_for_each_entry(ordered
, &root
->ordered_extents
,
4077 set_bit(BTRFS_ORDERED_IOERR
, &ordered
->flags
);
4078 spin_unlock(&root
->ordered_extent_lock
);
4081 static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info
*fs_info
)
4083 struct btrfs_root
*root
;
4084 struct list_head splice
;
4086 INIT_LIST_HEAD(&splice
);
4088 spin_lock(&fs_info
->ordered_root_lock
);
4089 list_splice_init(&fs_info
->ordered_roots
, &splice
);
4090 while (!list_empty(&splice
)) {
4091 root
= list_first_entry(&splice
, struct btrfs_root
,
4093 list_move_tail(&root
->ordered_root
,
4094 &fs_info
->ordered_roots
);
4096 spin_unlock(&fs_info
->ordered_root_lock
);
4097 btrfs_destroy_ordered_extents(root
);
4100 spin_lock(&fs_info
->ordered_root_lock
);
4102 spin_unlock(&fs_info
->ordered_root_lock
);
4105 static int btrfs_destroy_delayed_refs(struct btrfs_transaction
*trans
,
4106 struct btrfs_root
*root
)
4108 struct rb_node
*node
;
4109 struct btrfs_delayed_ref_root
*delayed_refs
;
4110 struct btrfs_delayed_ref_node
*ref
;
4113 delayed_refs
= &trans
->delayed_refs
;
4115 spin_lock(&delayed_refs
->lock
);
4116 if (atomic_read(&delayed_refs
->num_entries
) == 0) {
4117 spin_unlock(&delayed_refs
->lock
);
4118 btrfs_info(root
->fs_info
, "delayed_refs has NO entry");
4122 while ((node
= rb_first(&delayed_refs
->href_root
)) != NULL
) {
4123 struct btrfs_delayed_ref_head
*head
;
4124 struct btrfs_delayed_ref_node
*tmp
;
4125 bool pin_bytes
= false;
4127 head
= rb_entry(node
, struct btrfs_delayed_ref_head
,
4129 if (!mutex_trylock(&head
->mutex
)) {
4130 atomic_inc(&head
->node
.refs
);
4131 spin_unlock(&delayed_refs
->lock
);
4133 mutex_lock(&head
->mutex
);
4134 mutex_unlock(&head
->mutex
);
4135 btrfs_put_delayed_ref(&head
->node
);
4136 spin_lock(&delayed_refs
->lock
);
4139 spin_lock(&head
->lock
);
4140 list_for_each_entry_safe_reverse(ref
, tmp
, &head
->ref_list
,
4143 list_del(&ref
->list
);
4144 atomic_dec(&delayed_refs
->num_entries
);
4145 btrfs_put_delayed_ref(ref
);
4147 if (head
->must_insert_reserved
)
4149 btrfs_free_delayed_extent_op(head
->extent_op
);
4150 delayed_refs
->num_heads
--;
4151 if (head
->processing
== 0)
4152 delayed_refs
->num_heads_ready
--;
4153 atomic_dec(&delayed_refs
->num_entries
);
4154 head
->node
.in_tree
= 0;
4155 rb_erase(&head
->href_node
, &delayed_refs
->href_root
);
4156 spin_unlock(&head
->lock
);
4157 spin_unlock(&delayed_refs
->lock
);
4158 mutex_unlock(&head
->mutex
);
4161 btrfs_pin_extent(root
, head
->node
.bytenr
,
4162 head
->node
.num_bytes
, 1);
4163 btrfs_put_delayed_ref(&head
->node
);
4165 spin_lock(&delayed_refs
->lock
);
4168 spin_unlock(&delayed_refs
->lock
);
4173 static void btrfs_destroy_delalloc_inodes(struct btrfs_root
*root
)
4175 struct btrfs_inode
*btrfs_inode
;
4176 struct list_head splice
;
4178 INIT_LIST_HEAD(&splice
);
4180 spin_lock(&root
->delalloc_lock
);
4181 list_splice_init(&root
->delalloc_inodes
, &splice
);
4183 while (!list_empty(&splice
)) {
4184 btrfs_inode
= list_first_entry(&splice
, struct btrfs_inode
,
4187 list_del_init(&btrfs_inode
->delalloc_inodes
);
4188 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
4189 &btrfs_inode
->runtime_flags
);
4190 spin_unlock(&root
->delalloc_lock
);
4192 btrfs_invalidate_inodes(btrfs_inode
->root
);
4194 spin_lock(&root
->delalloc_lock
);
4197 spin_unlock(&root
->delalloc_lock
);
4200 static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info
*fs_info
)
4202 struct btrfs_root
*root
;
4203 struct list_head splice
;
4205 INIT_LIST_HEAD(&splice
);
4207 spin_lock(&fs_info
->delalloc_root_lock
);
4208 list_splice_init(&fs_info
->delalloc_roots
, &splice
);
4209 while (!list_empty(&splice
)) {
4210 root
= list_first_entry(&splice
, struct btrfs_root
,
4212 list_del_init(&root
->delalloc_root
);
4213 root
= btrfs_grab_fs_root(root
);
4215 spin_unlock(&fs_info
->delalloc_root_lock
);
4217 btrfs_destroy_delalloc_inodes(root
);
4218 btrfs_put_fs_root(root
);
4220 spin_lock(&fs_info
->delalloc_root_lock
);
4222 spin_unlock(&fs_info
->delalloc_root_lock
);
4225 static int btrfs_destroy_marked_extents(struct btrfs_root
*root
,
4226 struct extent_io_tree
*dirty_pages
,
4230 struct extent_buffer
*eb
;
4235 ret
= find_first_extent_bit(dirty_pages
, start
, &start
, &end
,
4240 clear_extent_bits(dirty_pages
, start
, end
, mark
, GFP_NOFS
);
4241 while (start
<= end
) {
4242 eb
= btrfs_find_tree_block(root
->fs_info
, start
);
4243 start
+= root
->nodesize
;
4246 wait_on_extent_buffer_writeback(eb
);
4248 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY
,
4250 clear_extent_buffer_dirty(eb
);
4251 free_extent_buffer_stale(eb
);
4258 static int btrfs_destroy_pinned_extent(struct btrfs_root
*root
,
4259 struct extent_io_tree
*pinned_extents
)
4261 struct extent_io_tree
*unpin
;
4267 unpin
= pinned_extents
;
4270 ret
= find_first_extent_bit(unpin
, 0, &start
, &end
,
4271 EXTENT_DIRTY
, NULL
);
4275 clear_extent_dirty(unpin
, start
, end
, GFP_NOFS
);
4276 btrfs_error_unpin_extent_range(root
, start
, end
);
4281 if (unpin
== &root
->fs_info
->freed_extents
[0])
4282 unpin
= &root
->fs_info
->freed_extents
[1];
4284 unpin
= &root
->fs_info
->freed_extents
[0];
4292 static void btrfs_free_pending_ordered(struct btrfs_transaction
*cur_trans
,
4293 struct btrfs_fs_info
*fs_info
)
4295 struct btrfs_ordered_extent
*ordered
;
4297 spin_lock(&fs_info
->trans_lock
);
4298 while (!list_empty(&cur_trans
->pending_ordered
)) {
4299 ordered
= list_first_entry(&cur_trans
->pending_ordered
,
4300 struct btrfs_ordered_extent
,
4302 list_del_init(&ordered
->trans_list
);
4303 spin_unlock(&fs_info
->trans_lock
);
4305 btrfs_put_ordered_extent(ordered
);
4306 spin_lock(&fs_info
->trans_lock
);
4308 spin_unlock(&fs_info
->trans_lock
);
4311 void btrfs_cleanup_one_transaction(struct btrfs_transaction
*cur_trans
,
4312 struct btrfs_root
*root
)
4314 btrfs_destroy_delayed_refs(cur_trans
, root
);
4316 cur_trans
->state
= TRANS_STATE_COMMIT_START
;
4317 wake_up(&root
->fs_info
->transaction_blocked_wait
);
4319 cur_trans
->state
= TRANS_STATE_UNBLOCKED
;
4320 wake_up(&root
->fs_info
->transaction_wait
);
4322 btrfs_free_pending_ordered(cur_trans
, root
->fs_info
);
4323 btrfs_destroy_delayed_inodes(root
);
4324 btrfs_assert_delayed_root_empty(root
);
4326 btrfs_destroy_marked_extents(root
, &cur_trans
->dirty_pages
,
4328 btrfs_destroy_pinned_extent(root
,
4329 root
->fs_info
->pinned_extents
);
4331 cur_trans
->state
=TRANS_STATE_COMPLETED
;
4332 wake_up(&cur_trans
->commit_wait
);
4335 memset(cur_trans, 0, sizeof(*cur_trans));
4336 kmem_cache_free(btrfs_transaction_cachep, cur_trans);
4340 static int btrfs_cleanup_transaction(struct btrfs_root
*root
)
4342 struct btrfs_transaction
*t
;
4344 mutex_lock(&root
->fs_info
->transaction_kthread_mutex
);
4346 spin_lock(&root
->fs_info
->trans_lock
);
4347 while (!list_empty(&root
->fs_info
->trans_list
)) {
4348 t
= list_first_entry(&root
->fs_info
->trans_list
,
4349 struct btrfs_transaction
, list
);
4350 if (t
->state
>= TRANS_STATE_COMMIT_START
) {
4351 atomic_inc(&t
->use_count
);
4352 spin_unlock(&root
->fs_info
->trans_lock
);
4353 btrfs_wait_for_commit(root
, t
->transid
);
4354 btrfs_put_transaction(t
);
4355 spin_lock(&root
->fs_info
->trans_lock
);
4358 if (t
== root
->fs_info
->running_transaction
) {
4359 t
->state
= TRANS_STATE_COMMIT_DOING
;
4360 spin_unlock(&root
->fs_info
->trans_lock
);
4362 * We wait for 0 num_writers since we don't hold a trans
4363 * handle open currently for this transaction.
4365 wait_event(t
->writer_wait
,
4366 atomic_read(&t
->num_writers
) == 0);
4368 spin_unlock(&root
->fs_info
->trans_lock
);
4370 btrfs_cleanup_one_transaction(t
, root
);
4372 spin_lock(&root
->fs_info
->trans_lock
);
4373 if (t
== root
->fs_info
->running_transaction
)
4374 root
->fs_info
->running_transaction
= NULL
;
4375 list_del_init(&t
->list
);
4376 spin_unlock(&root
->fs_info
->trans_lock
);
4378 btrfs_put_transaction(t
);
4379 trace_btrfs_transaction_commit(root
);
4380 spin_lock(&root
->fs_info
->trans_lock
);
4382 spin_unlock(&root
->fs_info
->trans_lock
);
4383 btrfs_destroy_all_ordered_extents(root
->fs_info
);
4384 btrfs_destroy_delayed_inodes(root
);
4385 btrfs_assert_delayed_root_empty(root
);
4386 btrfs_destroy_pinned_extent(root
, root
->fs_info
->pinned_extents
);
4387 btrfs_destroy_all_delalloc_inodes(root
->fs_info
);
4388 mutex_unlock(&root
->fs_info
->transaction_kthread_mutex
);
4393 static const struct extent_io_ops btree_extent_io_ops
= {
4394 .readpage_end_io_hook
= btree_readpage_end_io_hook
,
4395 .readpage_io_failed_hook
= btree_io_failed_hook
,
4396 .submit_bio_hook
= btree_submit_bio_hook
,
4397 /* note we're sharing with inode.c for the merge bio hook */
4398 .merge_bio_hook
= btrfs_merge_bio_hook
,