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/slab.h>
29 #include <linux/migrate.h>
30 #include <linux/ratelimit.h>
31 #include <linux/uuid.h>
32 #include <linux/semaphore.h>
33 #include <asm/unaligned.h>
37 #include "transaction.h"
38 #include "btrfs_inode.h"
40 #include "print-tree.h"
43 #include "free-space-cache.h"
44 #include "free-space-tree.h"
45 #include "inode-map.h"
46 #include "check-integrity.h"
47 #include "rcu-string.h"
48 #include "dev-replace.h"
52 #include "compression.h"
55 #include <asm/cpufeature.h>
58 #define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
59 BTRFS_HEADER_FLAG_RELOC |\
60 BTRFS_SUPER_FLAG_ERROR |\
61 BTRFS_SUPER_FLAG_SEEDING |\
62 BTRFS_SUPER_FLAG_METADUMP)
64 static const struct extent_io_ops btree_extent_io_ops
;
65 static void end_workqueue_fn(struct btrfs_work
*work
);
66 static void free_fs_root(struct btrfs_root
*root
);
67 static int btrfs_check_super_valid(struct btrfs_fs_info
*fs_info
);
68 static void btrfs_destroy_ordered_extents(struct btrfs_root
*root
);
69 static int btrfs_destroy_delayed_refs(struct btrfs_transaction
*trans
,
70 struct btrfs_fs_info
*fs_info
);
71 static void btrfs_destroy_delalloc_inodes(struct btrfs_root
*root
);
72 static int btrfs_destroy_marked_extents(struct btrfs_fs_info
*fs_info
,
73 struct extent_io_tree
*dirty_pages
,
75 static int btrfs_destroy_pinned_extent(struct btrfs_fs_info
*fs_info
,
76 struct extent_io_tree
*pinned_extents
);
77 static int btrfs_cleanup_transaction(struct btrfs_fs_info
*fs_info
);
78 static void btrfs_error_commit_super(struct btrfs_fs_info
*fs_info
);
81 * btrfs_end_io_wq structs are used to do processing in task context when an IO
82 * is complete. This is used during reads to verify checksums, and it is used
83 * by writes to insert metadata for new file extents after IO is complete.
85 struct btrfs_end_io_wq
{
89 struct btrfs_fs_info
*info
;
91 enum btrfs_wq_endio_type metadata
;
92 struct btrfs_work work
;
95 static struct kmem_cache
*btrfs_end_io_wq_cache
;
97 int __init
btrfs_end_io_wq_init(void)
99 btrfs_end_io_wq_cache
= kmem_cache_create("btrfs_end_io_wq",
100 sizeof(struct btrfs_end_io_wq
),
104 if (!btrfs_end_io_wq_cache
)
109 void btrfs_end_io_wq_exit(void)
111 kmem_cache_destroy(btrfs_end_io_wq_cache
);
115 * async submit bios are used to offload expensive checksumming
116 * onto the worker threads. They checksum file and metadata bios
117 * just before they are sent down the IO stack.
119 struct async_submit_bio
{
121 struct btrfs_fs_info
*fs_info
;
123 extent_submit_bio_hook_t
*submit_bio_start
;
124 extent_submit_bio_hook_t
*submit_bio_done
;
126 unsigned long bio_flags
;
128 * bio_offset is optional, can be used if the pages in the bio
129 * can't tell us where in the file the bio should go
132 struct btrfs_work work
;
137 * Lockdep class keys for extent_buffer->lock's in this root. For a given
138 * eb, the lockdep key is determined by the btrfs_root it belongs to and
139 * the level the eb occupies in the tree.
141 * Different roots are used for different purposes and may nest inside each
142 * other and they require separate keysets. As lockdep keys should be
143 * static, assign keysets according to the purpose of the root as indicated
144 * by btrfs_root->objectid. This ensures that all special purpose roots
145 * have separate keysets.
147 * Lock-nesting across peer nodes is always done with the immediate parent
148 * node locked thus preventing deadlock. As lockdep doesn't know this, use
149 * subclass to avoid triggering lockdep warning in such cases.
151 * The key is set by the readpage_end_io_hook after the buffer has passed
152 * csum validation but before the pages are unlocked. It is also set by
153 * btrfs_init_new_buffer on freshly allocated blocks.
155 * We also add a check to make sure the highest level of the tree is the
156 * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code
157 * needs update as well.
159 #ifdef CONFIG_DEBUG_LOCK_ALLOC
160 # if BTRFS_MAX_LEVEL != 8
164 static struct btrfs_lockdep_keyset
{
165 u64 id
; /* root objectid */
166 const char *name_stem
; /* lock name stem */
167 char names
[BTRFS_MAX_LEVEL
+ 1][20];
168 struct lock_class_key keys
[BTRFS_MAX_LEVEL
+ 1];
169 } btrfs_lockdep_keysets
[] = {
170 { .id
= BTRFS_ROOT_TREE_OBJECTID
, .name_stem
= "root" },
171 { .id
= BTRFS_EXTENT_TREE_OBJECTID
, .name_stem
= "extent" },
172 { .id
= BTRFS_CHUNK_TREE_OBJECTID
, .name_stem
= "chunk" },
173 { .id
= BTRFS_DEV_TREE_OBJECTID
, .name_stem
= "dev" },
174 { .id
= BTRFS_FS_TREE_OBJECTID
, .name_stem
= "fs" },
175 { .id
= BTRFS_CSUM_TREE_OBJECTID
, .name_stem
= "csum" },
176 { .id
= BTRFS_QUOTA_TREE_OBJECTID
, .name_stem
= "quota" },
177 { .id
= BTRFS_TREE_LOG_OBJECTID
, .name_stem
= "log" },
178 { .id
= BTRFS_TREE_RELOC_OBJECTID
, .name_stem
= "treloc" },
179 { .id
= BTRFS_DATA_RELOC_TREE_OBJECTID
, .name_stem
= "dreloc" },
180 { .id
= BTRFS_UUID_TREE_OBJECTID
, .name_stem
= "uuid" },
181 { .id
= BTRFS_FREE_SPACE_TREE_OBJECTID
, .name_stem
= "free-space" },
182 { .id
= 0, .name_stem
= "tree" },
185 void __init
btrfs_init_lockdep(void)
189 /* initialize lockdep class names */
190 for (i
= 0; i
< ARRAY_SIZE(btrfs_lockdep_keysets
); i
++) {
191 struct btrfs_lockdep_keyset
*ks
= &btrfs_lockdep_keysets
[i
];
193 for (j
= 0; j
< ARRAY_SIZE(ks
->names
); j
++)
194 snprintf(ks
->names
[j
], sizeof(ks
->names
[j
]),
195 "btrfs-%s-%02d", ks
->name_stem
, j
);
199 void btrfs_set_buffer_lockdep_class(u64 objectid
, struct extent_buffer
*eb
,
202 struct btrfs_lockdep_keyset
*ks
;
204 BUG_ON(level
>= ARRAY_SIZE(ks
->keys
));
206 /* find the matching keyset, id 0 is the default entry */
207 for (ks
= btrfs_lockdep_keysets
; ks
->id
; ks
++)
208 if (ks
->id
== objectid
)
211 lockdep_set_class_and_name(&eb
->lock
,
212 &ks
->keys
[level
], ks
->names
[level
]);
218 * extents on the btree inode are pretty simple, there's one extent
219 * that covers the entire device
221 static struct extent_map
*btree_get_extent(struct btrfs_inode
*inode
,
222 struct page
*page
, size_t pg_offset
, u64 start
, u64 len
,
225 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->vfs_inode
.i_sb
);
226 struct extent_map_tree
*em_tree
= &inode
->extent_tree
;
227 struct extent_map
*em
;
230 read_lock(&em_tree
->lock
);
231 em
= lookup_extent_mapping(em_tree
, start
, len
);
233 em
->bdev
= fs_info
->fs_devices
->latest_bdev
;
234 read_unlock(&em_tree
->lock
);
237 read_unlock(&em_tree
->lock
);
239 em
= alloc_extent_map();
241 em
= ERR_PTR(-ENOMEM
);
246 em
->block_len
= (u64
)-1;
248 em
->bdev
= fs_info
->fs_devices
->latest_bdev
;
250 write_lock(&em_tree
->lock
);
251 ret
= add_extent_mapping(em_tree
, em
, 0);
252 if (ret
== -EEXIST
) {
254 em
= lookup_extent_mapping(em_tree
, start
, len
);
261 write_unlock(&em_tree
->lock
);
267 u32
btrfs_csum_data(const char *data
, u32 seed
, size_t len
)
269 return btrfs_crc32c(seed
, data
, len
);
272 void btrfs_csum_final(u32 crc
, u8
*result
)
274 put_unaligned_le32(~crc
, result
);
278 * compute the csum for a btree block, and either verify it or write it
279 * into the csum field of the block.
281 static int csum_tree_block(struct btrfs_fs_info
*fs_info
,
282 struct extent_buffer
*buf
,
285 u16 csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
288 unsigned long cur_len
;
289 unsigned long offset
= BTRFS_CSUM_SIZE
;
291 unsigned long map_start
;
292 unsigned long map_len
;
295 unsigned long inline_result
;
297 len
= buf
->len
- offset
;
299 err
= map_private_extent_buffer(buf
, offset
, 32,
300 &kaddr
, &map_start
, &map_len
);
303 cur_len
= min(len
, map_len
- (offset
- map_start
));
304 crc
= btrfs_csum_data(kaddr
+ offset
- map_start
,
309 if (csum_size
> sizeof(inline_result
)) {
310 result
= kzalloc(csum_size
, GFP_NOFS
);
314 result
= (char *)&inline_result
;
317 btrfs_csum_final(crc
, result
);
320 if (memcmp_extent_buffer(buf
, result
, 0, csum_size
)) {
323 memcpy(&found
, result
, csum_size
);
325 read_extent_buffer(buf
, &val
, 0, csum_size
);
326 btrfs_warn_rl(fs_info
,
327 "%s checksum verify failed on %llu wanted %X found %X level %d",
328 fs_info
->sb
->s_id
, buf
->start
,
329 val
, found
, btrfs_header_level(buf
));
330 if (result
!= (char *)&inline_result
)
335 write_extent_buffer(buf
, result
, 0, csum_size
);
337 if (result
!= (char *)&inline_result
)
343 * we can't consider a given block up to date unless the transid of the
344 * block matches the transid in the parent node's pointer. This is how we
345 * detect blocks that either didn't get written at all or got written
346 * in the wrong place.
348 static int verify_parent_transid(struct extent_io_tree
*io_tree
,
349 struct extent_buffer
*eb
, u64 parent_transid
,
352 struct extent_state
*cached_state
= NULL
;
354 bool need_lock
= (current
->journal_info
== BTRFS_SEND_TRANS_STUB
);
356 if (!parent_transid
|| btrfs_header_generation(eb
) == parent_transid
)
363 btrfs_tree_read_lock(eb
);
364 btrfs_set_lock_blocking_rw(eb
, BTRFS_READ_LOCK
);
367 lock_extent_bits(io_tree
, eb
->start
, eb
->start
+ eb
->len
- 1,
369 if (extent_buffer_uptodate(eb
) &&
370 btrfs_header_generation(eb
) == parent_transid
) {
374 btrfs_err_rl(eb
->fs_info
,
375 "parent transid verify failed on %llu wanted %llu found %llu",
377 parent_transid
, btrfs_header_generation(eb
));
381 * Things reading via commit roots that don't have normal protection,
382 * like send, can have a really old block in cache that may point at a
383 * block that has been freed and re-allocated. So don't clear uptodate
384 * if we find an eb that is under IO (dirty/writeback) because we could
385 * end up reading in the stale data and then writing it back out and
386 * making everybody very sad.
388 if (!extent_buffer_under_io(eb
))
389 clear_extent_buffer_uptodate(eb
);
391 unlock_extent_cached(io_tree
, eb
->start
, eb
->start
+ eb
->len
- 1,
392 &cached_state
, GFP_NOFS
);
394 btrfs_tree_read_unlock_blocking(eb
);
399 * Return 0 if the superblock checksum type matches the checksum value of that
400 * algorithm. Pass the raw disk superblock data.
402 static int btrfs_check_super_csum(struct btrfs_fs_info
*fs_info
,
405 struct btrfs_super_block
*disk_sb
=
406 (struct btrfs_super_block
*)raw_disk_sb
;
407 u16 csum_type
= btrfs_super_csum_type(disk_sb
);
410 if (csum_type
== BTRFS_CSUM_TYPE_CRC32
) {
412 const int csum_size
= sizeof(crc
);
413 char result
[csum_size
];
416 * The super_block structure does not span the whole
417 * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space
418 * is filled with zeros and is included in the checksum.
420 crc
= btrfs_csum_data(raw_disk_sb
+ BTRFS_CSUM_SIZE
,
421 crc
, BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
);
422 btrfs_csum_final(crc
, result
);
424 if (memcmp(raw_disk_sb
, result
, csum_size
))
428 if (csum_type
>= ARRAY_SIZE(btrfs_csum_sizes
)) {
429 btrfs_err(fs_info
, "unsupported checksum algorithm %u",
438 * helper to read a given tree block, doing retries as required when
439 * the checksums don't match and we have alternate mirrors to try.
441 static int btree_read_extent_buffer_pages(struct btrfs_fs_info
*fs_info
,
442 struct extent_buffer
*eb
,
445 struct extent_io_tree
*io_tree
;
450 int failed_mirror
= 0;
452 clear_bit(EXTENT_BUFFER_CORRUPT
, &eb
->bflags
);
453 io_tree
= &BTRFS_I(fs_info
->btree_inode
)->io_tree
;
455 ret
= read_extent_buffer_pages(io_tree
, eb
, WAIT_COMPLETE
,
456 btree_get_extent
, mirror_num
);
458 if (!verify_parent_transid(io_tree
, eb
,
466 * This buffer's crc is fine, but its contents are corrupted, so
467 * there is no reason to read the other copies, they won't be
470 if (test_bit(EXTENT_BUFFER_CORRUPT
, &eb
->bflags
))
473 num_copies
= btrfs_num_copies(fs_info
,
478 if (!failed_mirror
) {
480 failed_mirror
= eb
->read_mirror
;
484 if (mirror_num
== failed_mirror
)
487 if (mirror_num
> num_copies
)
491 if (failed
&& !ret
&& failed_mirror
)
492 repair_eb_io_failure(fs_info
, eb
, failed_mirror
);
498 * checksum a dirty tree block before IO. This has extra checks to make sure
499 * we only fill in the checksum field in the first page of a multi-page block
502 static int csum_dirty_buffer(struct btrfs_fs_info
*fs_info
, struct page
*page
)
504 u64 start
= page_offset(page
);
506 struct extent_buffer
*eb
;
508 eb
= (struct extent_buffer
*)page
->private;
509 if (page
!= eb
->pages
[0])
512 found_start
= btrfs_header_bytenr(eb
);
514 * Please do not consolidate these warnings into a single if.
515 * It is useful to know what went wrong.
517 if (WARN_ON(found_start
!= start
))
519 if (WARN_ON(!PageUptodate(page
)))
522 ASSERT(memcmp_extent_buffer(eb
, fs_info
->fsid
,
523 btrfs_header_fsid(), BTRFS_FSID_SIZE
) == 0);
525 return csum_tree_block(fs_info
, eb
, 0);
528 static int check_tree_block_fsid(struct btrfs_fs_info
*fs_info
,
529 struct extent_buffer
*eb
)
531 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
532 u8 fsid
[BTRFS_UUID_SIZE
];
535 read_extent_buffer(eb
, fsid
, btrfs_header_fsid(), BTRFS_FSID_SIZE
);
537 if (!memcmp(fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
)) {
541 fs_devices
= fs_devices
->seed
;
546 #define CORRUPT(reason, eb, root, slot) \
547 btrfs_crit(root->fs_info, \
548 "corrupt %s, %s: block=%llu, root=%llu, slot=%d", \
549 btrfs_header_level(eb) == 0 ? "leaf" : "node", \
550 reason, btrfs_header_bytenr(eb), root->objectid, slot)
552 static noinline
int check_leaf(struct btrfs_root
*root
,
553 struct extent_buffer
*leaf
)
555 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
556 struct btrfs_key key
;
557 struct btrfs_key leaf_key
;
558 u32 nritems
= btrfs_header_nritems(leaf
);
562 * Extent buffers from a relocation tree have a owner field that
563 * corresponds to the subvolume tree they are based on. So just from an
564 * extent buffer alone we can not find out what is the id of the
565 * corresponding subvolume tree, so we can not figure out if the extent
566 * buffer corresponds to the root of the relocation tree or not. So skip
567 * this check for relocation trees.
569 if (nritems
== 0 && !btrfs_header_flag(leaf
, BTRFS_HEADER_FLAG_RELOC
)) {
570 struct btrfs_root
*check_root
;
572 key
.objectid
= btrfs_header_owner(leaf
);
573 key
.type
= BTRFS_ROOT_ITEM_KEY
;
574 key
.offset
= (u64
)-1;
576 check_root
= btrfs_get_fs_root(fs_info
, &key
, false);
578 * The only reason we also check NULL here is that during
579 * open_ctree() some roots has not yet been set up.
581 if (!IS_ERR_OR_NULL(check_root
)) {
582 struct extent_buffer
*eb
;
584 eb
= btrfs_root_node(check_root
);
585 /* if leaf is the root, then it's fine */
587 CORRUPT("non-root leaf's nritems is 0",
588 leaf
, check_root
, 0);
589 free_extent_buffer(eb
);
592 free_extent_buffer(eb
);
600 /* Check the 0 item */
601 if (btrfs_item_offset_nr(leaf
, 0) + btrfs_item_size_nr(leaf
, 0) !=
602 BTRFS_LEAF_DATA_SIZE(fs_info
)) {
603 CORRUPT("invalid item offset size pair", leaf
, root
, 0);
608 * Check to make sure each items keys are in the correct order and their
609 * offsets make sense. We only have to loop through nritems-1 because
610 * we check the current slot against the next slot, which verifies the
611 * next slot's offset+size makes sense and that the current's slot
614 for (slot
= 0; slot
< nritems
- 1; slot
++) {
615 btrfs_item_key_to_cpu(leaf
, &leaf_key
, slot
);
616 btrfs_item_key_to_cpu(leaf
, &key
, slot
+ 1);
618 /* Make sure the keys are in the right order */
619 if (btrfs_comp_cpu_keys(&leaf_key
, &key
) >= 0) {
620 CORRUPT("bad key order", leaf
, root
, slot
);
625 * Make sure the offset and ends are right, remember that the
626 * item data starts at the end of the leaf and grows towards the
629 if (btrfs_item_offset_nr(leaf
, slot
) !=
630 btrfs_item_end_nr(leaf
, slot
+ 1)) {
631 CORRUPT("slot offset bad", leaf
, root
, slot
);
636 * Check to make sure that we don't point outside of the leaf,
637 * just in case all the items are consistent to each other, but
638 * all point outside of the leaf.
640 if (btrfs_item_end_nr(leaf
, slot
) >
641 BTRFS_LEAF_DATA_SIZE(fs_info
)) {
642 CORRUPT("slot end outside of leaf", leaf
, root
, slot
);
650 static int check_node(struct btrfs_root
*root
, struct extent_buffer
*node
)
652 unsigned long nr
= btrfs_header_nritems(node
);
653 struct btrfs_key key
, next_key
;
658 if (nr
== 0 || nr
> BTRFS_NODEPTRS_PER_BLOCK(root
->fs_info
)) {
659 btrfs_crit(root
->fs_info
,
660 "corrupt node: block %llu root %llu nritems %lu",
661 node
->start
, root
->objectid
, nr
);
665 for (slot
= 0; slot
< nr
- 1; slot
++) {
666 bytenr
= btrfs_node_blockptr(node
, slot
);
667 btrfs_node_key_to_cpu(node
, &key
, slot
);
668 btrfs_node_key_to_cpu(node
, &next_key
, slot
+ 1);
671 CORRUPT("invalid item slot", node
, root
, slot
);
676 if (btrfs_comp_cpu_keys(&key
, &next_key
) >= 0) {
677 CORRUPT("bad key order", node
, root
, slot
);
686 static int btree_readpage_end_io_hook(struct btrfs_io_bio
*io_bio
,
687 u64 phy_offset
, struct page
*page
,
688 u64 start
, u64 end
, int mirror
)
692 struct extent_buffer
*eb
;
693 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
694 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
701 eb
= (struct extent_buffer
*)page
->private;
703 /* the pending IO might have been the only thing that kept this buffer
704 * in memory. Make sure we have a ref for all this other checks
706 extent_buffer_get(eb
);
708 reads_done
= atomic_dec_and_test(&eb
->io_pages
);
712 eb
->read_mirror
= mirror
;
713 if (test_bit(EXTENT_BUFFER_READ_ERR
, &eb
->bflags
)) {
718 found_start
= btrfs_header_bytenr(eb
);
719 if (found_start
!= eb
->start
) {
720 btrfs_err_rl(fs_info
, "bad tree block start %llu %llu",
721 found_start
, eb
->start
);
725 if (check_tree_block_fsid(fs_info
, eb
)) {
726 btrfs_err_rl(fs_info
, "bad fsid on block %llu",
731 found_level
= btrfs_header_level(eb
);
732 if (found_level
>= BTRFS_MAX_LEVEL
) {
733 btrfs_err(fs_info
, "bad tree block level %d",
734 (int)btrfs_header_level(eb
));
739 btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb
),
742 ret
= csum_tree_block(fs_info
, eb
, 1);
747 * If this is a leaf block and it is corrupt, set the corrupt bit so
748 * that we don't try and read the other copies of this block, just
751 if (found_level
== 0 && check_leaf(root
, eb
)) {
752 set_bit(EXTENT_BUFFER_CORRUPT
, &eb
->bflags
);
756 if (found_level
> 0 && check_node(root
, eb
))
760 set_extent_buffer_uptodate(eb
);
763 test_and_clear_bit(EXTENT_BUFFER_READAHEAD
, &eb
->bflags
))
764 btree_readahead_hook(eb
, ret
);
768 * our io error hook is going to dec the io pages
769 * again, we have to make sure it has something
772 atomic_inc(&eb
->io_pages
);
773 clear_extent_buffer_uptodate(eb
);
775 free_extent_buffer(eb
);
780 static int btree_io_failed_hook(struct page
*page
, int failed_mirror
)
782 struct extent_buffer
*eb
;
784 eb
= (struct extent_buffer
*)page
->private;
785 set_bit(EXTENT_BUFFER_READ_ERR
, &eb
->bflags
);
786 eb
->read_mirror
= failed_mirror
;
787 atomic_dec(&eb
->io_pages
);
788 if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD
, &eb
->bflags
))
789 btree_readahead_hook(eb
, -EIO
);
790 return -EIO
; /* we fixed nothing */
793 static void end_workqueue_bio(struct bio
*bio
)
795 struct btrfs_end_io_wq
*end_io_wq
= bio
->bi_private
;
796 struct btrfs_fs_info
*fs_info
;
797 struct btrfs_workqueue
*wq
;
798 btrfs_work_func_t func
;
800 fs_info
= end_io_wq
->info
;
801 end_io_wq
->status
= bio
->bi_status
;
803 if (bio_op(bio
) == REQ_OP_WRITE
) {
804 if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_METADATA
) {
805 wq
= fs_info
->endio_meta_write_workers
;
806 func
= btrfs_endio_meta_write_helper
;
807 } else if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_FREE_SPACE
) {
808 wq
= fs_info
->endio_freespace_worker
;
809 func
= btrfs_freespace_write_helper
;
810 } else if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_RAID56
) {
811 wq
= fs_info
->endio_raid56_workers
;
812 func
= btrfs_endio_raid56_helper
;
814 wq
= fs_info
->endio_write_workers
;
815 func
= btrfs_endio_write_helper
;
818 if (unlikely(end_io_wq
->metadata
==
819 BTRFS_WQ_ENDIO_DIO_REPAIR
)) {
820 wq
= fs_info
->endio_repair_workers
;
821 func
= btrfs_endio_repair_helper
;
822 } else if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_RAID56
) {
823 wq
= fs_info
->endio_raid56_workers
;
824 func
= btrfs_endio_raid56_helper
;
825 } else if (end_io_wq
->metadata
) {
826 wq
= fs_info
->endio_meta_workers
;
827 func
= btrfs_endio_meta_helper
;
829 wq
= fs_info
->endio_workers
;
830 func
= btrfs_endio_helper
;
834 btrfs_init_work(&end_io_wq
->work
, func
, end_workqueue_fn
, NULL
, NULL
);
835 btrfs_queue_work(wq
, &end_io_wq
->work
);
838 blk_status_t
btrfs_bio_wq_end_io(struct btrfs_fs_info
*info
, struct bio
*bio
,
839 enum btrfs_wq_endio_type metadata
)
841 struct btrfs_end_io_wq
*end_io_wq
;
843 end_io_wq
= kmem_cache_alloc(btrfs_end_io_wq_cache
, GFP_NOFS
);
845 return BLK_STS_RESOURCE
;
847 end_io_wq
->private = bio
->bi_private
;
848 end_io_wq
->end_io
= bio
->bi_end_io
;
849 end_io_wq
->info
= info
;
850 end_io_wq
->status
= 0;
851 end_io_wq
->bio
= bio
;
852 end_io_wq
->metadata
= metadata
;
854 bio
->bi_private
= end_io_wq
;
855 bio
->bi_end_io
= end_workqueue_bio
;
859 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info
*info
)
861 unsigned long limit
= min_t(unsigned long,
862 info
->thread_pool_size
,
863 info
->fs_devices
->open_devices
);
867 static void run_one_async_start(struct btrfs_work
*work
)
869 struct async_submit_bio
*async
;
872 async
= container_of(work
, struct async_submit_bio
, work
);
873 ret
= async
->submit_bio_start(async
->private_data
, async
->bio
,
874 async
->mirror_num
, async
->bio_flags
,
880 static void run_one_async_done(struct btrfs_work
*work
)
882 struct btrfs_fs_info
*fs_info
;
883 struct async_submit_bio
*async
;
886 async
= container_of(work
, struct async_submit_bio
, work
);
887 fs_info
= async
->fs_info
;
889 limit
= btrfs_async_submit_limit(fs_info
);
890 limit
= limit
* 2 / 3;
893 * atomic_dec_return implies a barrier for waitqueue_active
895 if (atomic_dec_return(&fs_info
->nr_async_submits
) < limit
&&
896 waitqueue_active(&fs_info
->async_submit_wait
))
897 wake_up(&fs_info
->async_submit_wait
);
899 /* If an error occurred we just want to clean up the bio and move on */
901 async
->bio
->bi_status
= async
->status
;
902 bio_endio(async
->bio
);
906 async
->submit_bio_done(async
->private_data
, async
->bio
, async
->mirror_num
,
907 async
->bio_flags
, async
->bio_offset
);
910 static void run_one_async_free(struct btrfs_work
*work
)
912 struct async_submit_bio
*async
;
914 async
= container_of(work
, struct async_submit_bio
, work
);
918 blk_status_t
btrfs_wq_submit_bio(struct btrfs_fs_info
*fs_info
, struct bio
*bio
,
919 int mirror_num
, unsigned long bio_flags
,
920 u64 bio_offset
, void *private_data
,
921 extent_submit_bio_hook_t
*submit_bio_start
,
922 extent_submit_bio_hook_t
*submit_bio_done
)
924 struct async_submit_bio
*async
;
926 async
= kmalloc(sizeof(*async
), GFP_NOFS
);
928 return BLK_STS_RESOURCE
;
930 async
->private_data
= private_data
;
931 async
->fs_info
= fs_info
;
933 async
->mirror_num
= mirror_num
;
934 async
->submit_bio_start
= submit_bio_start
;
935 async
->submit_bio_done
= submit_bio_done
;
937 btrfs_init_work(&async
->work
, btrfs_worker_helper
, run_one_async_start
,
938 run_one_async_done
, run_one_async_free
);
940 async
->bio_flags
= bio_flags
;
941 async
->bio_offset
= bio_offset
;
945 atomic_inc(&fs_info
->nr_async_submits
);
947 if (op_is_sync(bio
->bi_opf
))
948 btrfs_set_work_high_priority(&async
->work
);
950 btrfs_queue_work(fs_info
->workers
, &async
->work
);
952 while (atomic_read(&fs_info
->async_submit_draining
) &&
953 atomic_read(&fs_info
->nr_async_submits
)) {
954 wait_event(fs_info
->async_submit_wait
,
955 (atomic_read(&fs_info
->nr_async_submits
) == 0));
961 static blk_status_t
btree_csum_one_bio(struct bio
*bio
)
963 struct bio_vec
*bvec
;
964 struct btrfs_root
*root
;
967 ASSERT(!bio_flagged(bio
, BIO_CLONED
));
968 bio_for_each_segment_all(bvec
, bio
, i
) {
969 root
= BTRFS_I(bvec
->bv_page
->mapping
->host
)->root
;
970 ret
= csum_dirty_buffer(root
->fs_info
, bvec
->bv_page
);
975 return errno_to_blk_status(ret
);
978 static blk_status_t
__btree_submit_bio_start(void *private_data
, struct bio
*bio
,
979 int mirror_num
, unsigned long bio_flags
,
983 * when we're called for a write, we're already in the async
984 * submission context. Just jump into btrfs_map_bio
986 return btree_csum_one_bio(bio
);
989 static blk_status_t
__btree_submit_bio_done(void *private_data
, struct bio
*bio
,
990 int mirror_num
, unsigned long bio_flags
,
993 struct inode
*inode
= private_data
;
997 * when we're called for a write, we're already in the async
998 * submission context. Just jump into btrfs_map_bio
1000 ret
= btrfs_map_bio(btrfs_sb(inode
->i_sb
), bio
, mirror_num
, 1);
1002 bio
->bi_status
= ret
;
1008 static int check_async_write(unsigned long bio_flags
)
1010 if (bio_flags
& EXTENT_BIO_TREE_LOG
)
1013 if (static_cpu_has(X86_FEATURE_XMM4_2
))
1019 static blk_status_t
btree_submit_bio_hook(void *private_data
, struct bio
*bio
,
1020 int mirror_num
, unsigned long bio_flags
,
1023 struct inode
*inode
= private_data
;
1024 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1025 int async
= check_async_write(bio_flags
);
1028 if (bio_op(bio
) != REQ_OP_WRITE
) {
1030 * called for a read, do the setup so that checksum validation
1031 * can happen in the async kernel threads
1033 ret
= btrfs_bio_wq_end_io(fs_info
, bio
,
1034 BTRFS_WQ_ENDIO_METADATA
);
1037 ret
= btrfs_map_bio(fs_info
, bio
, mirror_num
, 0);
1038 } else if (!async
) {
1039 ret
= btree_csum_one_bio(bio
);
1042 ret
= btrfs_map_bio(fs_info
, bio
, mirror_num
, 0);
1045 * kthread helpers are used to submit writes so that
1046 * checksumming can happen in parallel across all CPUs
1048 ret
= btrfs_wq_submit_bio(fs_info
, bio
, mirror_num
, 0,
1049 bio_offset
, private_data
,
1050 __btree_submit_bio_start
,
1051 __btree_submit_bio_done
);
1059 bio
->bi_status
= ret
;
1064 #ifdef CONFIG_MIGRATION
1065 static int btree_migratepage(struct address_space
*mapping
,
1066 struct page
*newpage
, struct page
*page
,
1067 enum migrate_mode mode
)
1070 * we can't safely write a btree page from here,
1071 * we haven't done the locking hook
1073 if (PageDirty(page
))
1076 * Buffers may be managed in a filesystem specific way.
1077 * We must have no buffers or drop them.
1079 if (page_has_private(page
) &&
1080 !try_to_release_page(page
, GFP_KERNEL
))
1082 return migrate_page(mapping
, newpage
, page
, mode
);
1087 static int btree_writepages(struct address_space
*mapping
,
1088 struct writeback_control
*wbc
)
1090 struct btrfs_fs_info
*fs_info
;
1093 if (wbc
->sync_mode
== WB_SYNC_NONE
) {
1095 if (wbc
->for_kupdate
)
1098 fs_info
= BTRFS_I(mapping
->host
)->root
->fs_info
;
1099 /* this is a bit racy, but that's ok */
1100 ret
= percpu_counter_compare(&fs_info
->dirty_metadata_bytes
,
1101 BTRFS_DIRTY_METADATA_THRESH
);
1105 return btree_write_cache_pages(mapping
, wbc
);
1108 static int btree_readpage(struct file
*file
, struct page
*page
)
1110 struct extent_io_tree
*tree
;
1111 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
1112 return extent_read_full_page(tree
, page
, btree_get_extent
, 0);
1115 static int btree_releasepage(struct page
*page
, gfp_t gfp_flags
)
1117 if (PageWriteback(page
) || PageDirty(page
))
1120 return try_release_extent_buffer(page
);
1123 static void btree_invalidatepage(struct page
*page
, unsigned int offset
,
1124 unsigned int length
)
1126 struct extent_io_tree
*tree
;
1127 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
1128 extent_invalidatepage(tree
, page
, offset
);
1129 btree_releasepage(page
, GFP_NOFS
);
1130 if (PagePrivate(page
)) {
1131 btrfs_warn(BTRFS_I(page
->mapping
->host
)->root
->fs_info
,
1132 "page private not zero on page %llu",
1133 (unsigned long long)page_offset(page
));
1134 ClearPagePrivate(page
);
1135 set_page_private(page
, 0);
1140 static int btree_set_page_dirty(struct page
*page
)
1143 struct extent_buffer
*eb
;
1145 BUG_ON(!PagePrivate(page
));
1146 eb
= (struct extent_buffer
*)page
->private;
1148 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY
, &eb
->bflags
));
1149 BUG_ON(!atomic_read(&eb
->refs
));
1150 btrfs_assert_tree_locked(eb
);
1152 return __set_page_dirty_nobuffers(page
);
1155 static const struct address_space_operations btree_aops
= {
1156 .readpage
= btree_readpage
,
1157 .writepages
= btree_writepages
,
1158 .releasepage
= btree_releasepage
,
1159 .invalidatepage
= btree_invalidatepage
,
1160 #ifdef CONFIG_MIGRATION
1161 .migratepage
= btree_migratepage
,
1163 .set_page_dirty
= btree_set_page_dirty
,
1166 void readahead_tree_block(struct btrfs_fs_info
*fs_info
, u64 bytenr
)
1168 struct extent_buffer
*buf
= NULL
;
1169 struct inode
*btree_inode
= fs_info
->btree_inode
;
1171 buf
= btrfs_find_create_tree_block(fs_info
, bytenr
);
1174 read_extent_buffer_pages(&BTRFS_I(btree_inode
)->io_tree
,
1175 buf
, WAIT_NONE
, btree_get_extent
, 0);
1176 free_extent_buffer(buf
);
1179 int reada_tree_block_flagged(struct btrfs_fs_info
*fs_info
, u64 bytenr
,
1180 int mirror_num
, struct extent_buffer
**eb
)
1182 struct extent_buffer
*buf
= NULL
;
1183 struct inode
*btree_inode
= fs_info
->btree_inode
;
1184 struct extent_io_tree
*io_tree
= &BTRFS_I(btree_inode
)->io_tree
;
1187 buf
= btrfs_find_create_tree_block(fs_info
, bytenr
);
1191 set_bit(EXTENT_BUFFER_READAHEAD
, &buf
->bflags
);
1193 ret
= read_extent_buffer_pages(io_tree
, buf
, WAIT_PAGE_LOCK
,
1194 btree_get_extent
, mirror_num
);
1196 free_extent_buffer(buf
);
1200 if (test_bit(EXTENT_BUFFER_CORRUPT
, &buf
->bflags
)) {
1201 free_extent_buffer(buf
);
1203 } else if (extent_buffer_uptodate(buf
)) {
1206 free_extent_buffer(buf
);
1211 struct extent_buffer
*btrfs_find_create_tree_block(
1212 struct btrfs_fs_info
*fs_info
,
1215 if (btrfs_is_testing(fs_info
))
1216 return alloc_test_extent_buffer(fs_info
, bytenr
);
1217 return alloc_extent_buffer(fs_info
, bytenr
);
1221 int btrfs_write_tree_block(struct extent_buffer
*buf
)
1223 return filemap_fdatawrite_range(buf
->pages
[0]->mapping
, buf
->start
,
1224 buf
->start
+ buf
->len
- 1);
1227 void btrfs_wait_tree_block_writeback(struct extent_buffer
*buf
)
1229 filemap_fdatawait_range(buf
->pages
[0]->mapping
,
1230 buf
->start
, buf
->start
+ buf
->len
- 1);
1233 struct extent_buffer
*read_tree_block(struct btrfs_fs_info
*fs_info
, u64 bytenr
,
1236 struct extent_buffer
*buf
= NULL
;
1239 buf
= btrfs_find_create_tree_block(fs_info
, bytenr
);
1243 ret
= btree_read_extent_buffer_pages(fs_info
, buf
, parent_transid
);
1245 free_extent_buffer(buf
);
1246 return ERR_PTR(ret
);
1252 void clean_tree_block(struct btrfs_fs_info
*fs_info
,
1253 struct extent_buffer
*buf
)
1255 if (btrfs_header_generation(buf
) ==
1256 fs_info
->running_transaction
->transid
) {
1257 btrfs_assert_tree_locked(buf
);
1259 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY
, &buf
->bflags
)) {
1260 percpu_counter_add_batch(&fs_info
->dirty_metadata_bytes
,
1262 fs_info
->dirty_metadata_batch
);
1263 /* ugh, clear_extent_buffer_dirty needs to lock the page */
1264 btrfs_set_lock_blocking(buf
);
1265 clear_extent_buffer_dirty(buf
);
1270 static struct btrfs_subvolume_writers
*btrfs_alloc_subvolume_writers(void)
1272 struct btrfs_subvolume_writers
*writers
;
1275 writers
= kmalloc(sizeof(*writers
), GFP_NOFS
);
1277 return ERR_PTR(-ENOMEM
);
1279 ret
= percpu_counter_init(&writers
->counter
, 0, GFP_KERNEL
);
1282 return ERR_PTR(ret
);
1285 init_waitqueue_head(&writers
->wait
);
1290 btrfs_free_subvolume_writers(struct btrfs_subvolume_writers
*writers
)
1292 percpu_counter_destroy(&writers
->counter
);
1296 static void __setup_root(struct btrfs_root
*root
, struct btrfs_fs_info
*fs_info
,
1299 bool dummy
= test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO
, &fs_info
->fs_state
);
1301 root
->commit_root
= NULL
;
1303 root
->orphan_cleanup_state
= 0;
1305 root
->objectid
= objectid
;
1306 root
->last_trans
= 0;
1307 root
->highest_objectid
= 0;
1308 root
->nr_delalloc_inodes
= 0;
1309 root
->nr_ordered_extents
= 0;
1311 root
->inode_tree
= RB_ROOT
;
1312 INIT_RADIX_TREE(&root
->delayed_nodes_tree
, GFP_ATOMIC
);
1313 root
->block_rsv
= NULL
;
1314 root
->orphan_block_rsv
= NULL
;
1316 INIT_LIST_HEAD(&root
->dirty_list
);
1317 INIT_LIST_HEAD(&root
->root_list
);
1318 INIT_LIST_HEAD(&root
->delalloc_inodes
);
1319 INIT_LIST_HEAD(&root
->delalloc_root
);
1320 INIT_LIST_HEAD(&root
->ordered_extents
);
1321 INIT_LIST_HEAD(&root
->ordered_root
);
1322 INIT_LIST_HEAD(&root
->logged_list
[0]);
1323 INIT_LIST_HEAD(&root
->logged_list
[1]);
1324 spin_lock_init(&root
->orphan_lock
);
1325 spin_lock_init(&root
->inode_lock
);
1326 spin_lock_init(&root
->delalloc_lock
);
1327 spin_lock_init(&root
->ordered_extent_lock
);
1328 spin_lock_init(&root
->accounting_lock
);
1329 spin_lock_init(&root
->log_extents_lock
[0]);
1330 spin_lock_init(&root
->log_extents_lock
[1]);
1331 mutex_init(&root
->objectid_mutex
);
1332 mutex_init(&root
->log_mutex
);
1333 mutex_init(&root
->ordered_extent_mutex
);
1334 mutex_init(&root
->delalloc_mutex
);
1335 init_waitqueue_head(&root
->log_writer_wait
);
1336 init_waitqueue_head(&root
->log_commit_wait
[0]);
1337 init_waitqueue_head(&root
->log_commit_wait
[1]);
1338 INIT_LIST_HEAD(&root
->log_ctxs
[0]);
1339 INIT_LIST_HEAD(&root
->log_ctxs
[1]);
1340 atomic_set(&root
->log_commit
[0], 0);
1341 atomic_set(&root
->log_commit
[1], 0);
1342 atomic_set(&root
->log_writers
, 0);
1343 atomic_set(&root
->log_batch
, 0);
1344 atomic_set(&root
->orphan_inodes
, 0);
1345 refcount_set(&root
->refs
, 1);
1346 atomic_set(&root
->will_be_snapshoted
, 0);
1347 atomic64_set(&root
->qgroup_meta_rsv
, 0);
1348 root
->log_transid
= 0;
1349 root
->log_transid_committed
= -1;
1350 root
->last_log_commit
= 0;
1352 extent_io_tree_init(&root
->dirty_log_pages
, NULL
);
1354 memset(&root
->root_key
, 0, sizeof(root
->root_key
));
1355 memset(&root
->root_item
, 0, sizeof(root
->root_item
));
1356 memset(&root
->defrag_progress
, 0, sizeof(root
->defrag_progress
));
1358 root
->defrag_trans_start
= fs_info
->generation
;
1360 root
->defrag_trans_start
= 0;
1361 root
->root_key
.objectid
= objectid
;
1364 spin_lock_init(&root
->root_item_lock
);
1367 static struct btrfs_root
*btrfs_alloc_root(struct btrfs_fs_info
*fs_info
,
1370 struct btrfs_root
*root
= kzalloc(sizeof(*root
), flags
);
1372 root
->fs_info
= fs_info
;
1376 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1377 /* Should only be used by the testing infrastructure */
1378 struct btrfs_root
*btrfs_alloc_dummy_root(struct btrfs_fs_info
*fs_info
)
1380 struct btrfs_root
*root
;
1383 return ERR_PTR(-EINVAL
);
1385 root
= btrfs_alloc_root(fs_info
, GFP_KERNEL
);
1387 return ERR_PTR(-ENOMEM
);
1389 /* We don't use the stripesize in selftest, set it as sectorsize */
1390 __setup_root(root
, fs_info
, BTRFS_ROOT_TREE_OBJECTID
);
1391 root
->alloc_bytenr
= 0;
1397 struct btrfs_root
*btrfs_create_tree(struct btrfs_trans_handle
*trans
,
1398 struct btrfs_fs_info
*fs_info
,
1401 struct extent_buffer
*leaf
;
1402 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
1403 struct btrfs_root
*root
;
1404 struct btrfs_key key
;
1408 root
= btrfs_alloc_root(fs_info
, GFP_KERNEL
);
1410 return ERR_PTR(-ENOMEM
);
1412 __setup_root(root
, fs_info
, objectid
);
1413 root
->root_key
.objectid
= objectid
;
1414 root
->root_key
.type
= BTRFS_ROOT_ITEM_KEY
;
1415 root
->root_key
.offset
= 0;
1417 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, objectid
, NULL
, 0, 0, 0);
1419 ret
= PTR_ERR(leaf
);
1424 memzero_extent_buffer(leaf
, 0, sizeof(struct btrfs_header
));
1425 btrfs_set_header_bytenr(leaf
, leaf
->start
);
1426 btrfs_set_header_generation(leaf
, trans
->transid
);
1427 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
1428 btrfs_set_header_owner(leaf
, objectid
);
1431 write_extent_buffer_fsid(leaf
, fs_info
->fsid
);
1432 write_extent_buffer_chunk_tree_uuid(leaf
, fs_info
->chunk_tree_uuid
);
1433 btrfs_mark_buffer_dirty(leaf
);
1435 root
->commit_root
= btrfs_root_node(root
);
1436 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
1438 root
->root_item
.flags
= 0;
1439 root
->root_item
.byte_limit
= 0;
1440 btrfs_set_root_bytenr(&root
->root_item
, leaf
->start
);
1441 btrfs_set_root_generation(&root
->root_item
, trans
->transid
);
1442 btrfs_set_root_level(&root
->root_item
, 0);
1443 btrfs_set_root_refs(&root
->root_item
, 1);
1444 btrfs_set_root_used(&root
->root_item
, leaf
->len
);
1445 btrfs_set_root_last_snapshot(&root
->root_item
, 0);
1446 btrfs_set_root_dirid(&root
->root_item
, 0);
1448 memcpy(root
->root_item
.uuid
, uuid
.b
, BTRFS_UUID_SIZE
);
1449 root
->root_item
.drop_level
= 0;
1451 key
.objectid
= objectid
;
1452 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1454 ret
= btrfs_insert_root(trans
, tree_root
, &key
, &root
->root_item
);
1458 btrfs_tree_unlock(leaf
);
1464 btrfs_tree_unlock(leaf
);
1465 free_extent_buffer(root
->commit_root
);
1466 free_extent_buffer(leaf
);
1470 return ERR_PTR(ret
);
1473 static struct btrfs_root
*alloc_log_tree(struct btrfs_trans_handle
*trans
,
1474 struct btrfs_fs_info
*fs_info
)
1476 struct btrfs_root
*root
;
1477 struct extent_buffer
*leaf
;
1479 root
= btrfs_alloc_root(fs_info
, GFP_NOFS
);
1481 return ERR_PTR(-ENOMEM
);
1483 __setup_root(root
, fs_info
, BTRFS_TREE_LOG_OBJECTID
);
1485 root
->root_key
.objectid
= BTRFS_TREE_LOG_OBJECTID
;
1486 root
->root_key
.type
= BTRFS_ROOT_ITEM_KEY
;
1487 root
->root_key
.offset
= BTRFS_TREE_LOG_OBJECTID
;
1490 * DON'T set REF_COWS for log trees
1492 * log trees do not get reference counted because they go away
1493 * before a real commit is actually done. They do store pointers
1494 * to file data extents, and those reference counts still get
1495 * updated (along with back refs to the log tree).
1498 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, BTRFS_TREE_LOG_OBJECTID
,
1502 return ERR_CAST(leaf
);
1505 memzero_extent_buffer(leaf
, 0, sizeof(struct btrfs_header
));
1506 btrfs_set_header_bytenr(leaf
, leaf
->start
);
1507 btrfs_set_header_generation(leaf
, trans
->transid
);
1508 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
1509 btrfs_set_header_owner(leaf
, BTRFS_TREE_LOG_OBJECTID
);
1512 write_extent_buffer_fsid(root
->node
, fs_info
->fsid
);
1513 btrfs_mark_buffer_dirty(root
->node
);
1514 btrfs_tree_unlock(root
->node
);
1518 int btrfs_init_log_root_tree(struct btrfs_trans_handle
*trans
,
1519 struct btrfs_fs_info
*fs_info
)
1521 struct btrfs_root
*log_root
;
1523 log_root
= alloc_log_tree(trans
, fs_info
);
1524 if (IS_ERR(log_root
))
1525 return PTR_ERR(log_root
);
1526 WARN_ON(fs_info
->log_root_tree
);
1527 fs_info
->log_root_tree
= log_root
;
1531 int btrfs_add_log_tree(struct btrfs_trans_handle
*trans
,
1532 struct btrfs_root
*root
)
1534 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1535 struct btrfs_root
*log_root
;
1536 struct btrfs_inode_item
*inode_item
;
1538 log_root
= alloc_log_tree(trans
, fs_info
);
1539 if (IS_ERR(log_root
))
1540 return PTR_ERR(log_root
);
1542 log_root
->last_trans
= trans
->transid
;
1543 log_root
->root_key
.offset
= root
->root_key
.objectid
;
1545 inode_item
= &log_root
->root_item
.inode
;
1546 btrfs_set_stack_inode_generation(inode_item
, 1);
1547 btrfs_set_stack_inode_size(inode_item
, 3);
1548 btrfs_set_stack_inode_nlink(inode_item
, 1);
1549 btrfs_set_stack_inode_nbytes(inode_item
,
1551 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
1553 btrfs_set_root_node(&log_root
->root_item
, log_root
->node
);
1555 WARN_ON(root
->log_root
);
1556 root
->log_root
= log_root
;
1557 root
->log_transid
= 0;
1558 root
->log_transid_committed
= -1;
1559 root
->last_log_commit
= 0;
1563 static struct btrfs_root
*btrfs_read_tree_root(struct btrfs_root
*tree_root
,
1564 struct btrfs_key
*key
)
1566 struct btrfs_root
*root
;
1567 struct btrfs_fs_info
*fs_info
= tree_root
->fs_info
;
1568 struct btrfs_path
*path
;
1572 path
= btrfs_alloc_path();
1574 return ERR_PTR(-ENOMEM
);
1576 root
= btrfs_alloc_root(fs_info
, GFP_NOFS
);
1582 __setup_root(root
, fs_info
, key
->objectid
);
1584 ret
= btrfs_find_root(tree_root
, key
, path
,
1585 &root
->root_item
, &root
->root_key
);
1592 generation
= btrfs_root_generation(&root
->root_item
);
1593 root
->node
= read_tree_block(fs_info
,
1594 btrfs_root_bytenr(&root
->root_item
),
1596 if (IS_ERR(root
->node
)) {
1597 ret
= PTR_ERR(root
->node
);
1599 } else if (!btrfs_buffer_uptodate(root
->node
, generation
, 0)) {
1601 free_extent_buffer(root
->node
);
1604 root
->commit_root
= btrfs_root_node(root
);
1606 btrfs_free_path(path
);
1612 root
= ERR_PTR(ret
);
1616 struct btrfs_root
*btrfs_read_fs_root(struct btrfs_root
*tree_root
,
1617 struct btrfs_key
*location
)
1619 struct btrfs_root
*root
;
1621 root
= btrfs_read_tree_root(tree_root
, location
);
1625 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
1626 set_bit(BTRFS_ROOT_REF_COWS
, &root
->state
);
1627 btrfs_check_and_init_root_item(&root
->root_item
);
1633 int btrfs_init_fs_root(struct btrfs_root
*root
)
1636 struct btrfs_subvolume_writers
*writers
;
1638 root
->free_ino_ctl
= kzalloc(sizeof(*root
->free_ino_ctl
), GFP_NOFS
);
1639 root
->free_ino_pinned
= kzalloc(sizeof(*root
->free_ino_pinned
),
1641 if (!root
->free_ino_pinned
|| !root
->free_ino_ctl
) {
1646 writers
= btrfs_alloc_subvolume_writers();
1647 if (IS_ERR(writers
)) {
1648 ret
= PTR_ERR(writers
);
1651 root
->subv_writers
= writers
;
1653 btrfs_init_free_ino_ctl(root
);
1654 spin_lock_init(&root
->ino_cache_lock
);
1655 init_waitqueue_head(&root
->ino_cache_wait
);
1657 ret
= get_anon_bdev(&root
->anon_dev
);
1661 mutex_lock(&root
->objectid_mutex
);
1662 ret
= btrfs_find_highest_objectid(root
,
1663 &root
->highest_objectid
);
1665 mutex_unlock(&root
->objectid_mutex
);
1669 ASSERT(root
->highest_objectid
<= BTRFS_LAST_FREE_OBJECTID
);
1671 mutex_unlock(&root
->objectid_mutex
);
1675 /* the caller is responsible to call free_fs_root */
1679 struct btrfs_root
*btrfs_lookup_fs_root(struct btrfs_fs_info
*fs_info
,
1682 struct btrfs_root
*root
;
1684 spin_lock(&fs_info
->fs_roots_radix_lock
);
1685 root
= radix_tree_lookup(&fs_info
->fs_roots_radix
,
1686 (unsigned long)root_id
);
1687 spin_unlock(&fs_info
->fs_roots_radix_lock
);
1691 int btrfs_insert_fs_root(struct btrfs_fs_info
*fs_info
,
1692 struct btrfs_root
*root
)
1696 ret
= radix_tree_preload(GFP_NOFS
);
1700 spin_lock(&fs_info
->fs_roots_radix_lock
);
1701 ret
= radix_tree_insert(&fs_info
->fs_roots_radix
,
1702 (unsigned long)root
->root_key
.objectid
,
1705 set_bit(BTRFS_ROOT_IN_RADIX
, &root
->state
);
1706 spin_unlock(&fs_info
->fs_roots_radix_lock
);
1707 radix_tree_preload_end();
1712 struct btrfs_root
*btrfs_get_fs_root(struct btrfs_fs_info
*fs_info
,
1713 struct btrfs_key
*location
,
1716 struct btrfs_root
*root
;
1717 struct btrfs_path
*path
;
1718 struct btrfs_key key
;
1721 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
1722 return fs_info
->tree_root
;
1723 if (location
->objectid
== BTRFS_EXTENT_TREE_OBJECTID
)
1724 return fs_info
->extent_root
;
1725 if (location
->objectid
== BTRFS_CHUNK_TREE_OBJECTID
)
1726 return fs_info
->chunk_root
;
1727 if (location
->objectid
== BTRFS_DEV_TREE_OBJECTID
)
1728 return fs_info
->dev_root
;
1729 if (location
->objectid
== BTRFS_CSUM_TREE_OBJECTID
)
1730 return fs_info
->csum_root
;
1731 if (location
->objectid
== BTRFS_QUOTA_TREE_OBJECTID
)
1732 return fs_info
->quota_root
? fs_info
->quota_root
:
1734 if (location
->objectid
== BTRFS_UUID_TREE_OBJECTID
)
1735 return fs_info
->uuid_root
? fs_info
->uuid_root
:
1737 if (location
->objectid
== BTRFS_FREE_SPACE_TREE_OBJECTID
)
1738 return fs_info
->free_space_root
? fs_info
->free_space_root
:
1741 root
= btrfs_lookup_fs_root(fs_info
, location
->objectid
);
1743 if (check_ref
&& btrfs_root_refs(&root
->root_item
) == 0)
1744 return ERR_PTR(-ENOENT
);
1748 root
= btrfs_read_fs_root(fs_info
->tree_root
, location
);
1752 if (check_ref
&& btrfs_root_refs(&root
->root_item
) == 0) {
1757 ret
= btrfs_init_fs_root(root
);
1761 path
= btrfs_alloc_path();
1766 key
.objectid
= BTRFS_ORPHAN_OBJECTID
;
1767 key
.type
= BTRFS_ORPHAN_ITEM_KEY
;
1768 key
.offset
= location
->objectid
;
1770 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
1771 btrfs_free_path(path
);
1775 set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &root
->state
);
1777 ret
= btrfs_insert_fs_root(fs_info
, root
);
1779 if (ret
== -EEXIST
) {
1788 return ERR_PTR(ret
);
1791 static int btrfs_congested_fn(void *congested_data
, int bdi_bits
)
1793 struct btrfs_fs_info
*info
= (struct btrfs_fs_info
*)congested_data
;
1795 struct btrfs_device
*device
;
1796 struct backing_dev_info
*bdi
;
1799 list_for_each_entry_rcu(device
, &info
->fs_devices
->devices
, dev_list
) {
1802 bdi
= device
->bdev
->bd_bdi
;
1803 if (bdi_congested(bdi
, bdi_bits
)) {
1813 * called by the kthread helper functions to finally call the bio end_io
1814 * functions. This is where read checksum verification actually happens
1816 static void end_workqueue_fn(struct btrfs_work
*work
)
1819 struct btrfs_end_io_wq
*end_io_wq
;
1821 end_io_wq
= container_of(work
, struct btrfs_end_io_wq
, work
);
1822 bio
= end_io_wq
->bio
;
1824 bio
->bi_status
= end_io_wq
->status
;
1825 bio
->bi_private
= end_io_wq
->private;
1826 bio
->bi_end_io
= end_io_wq
->end_io
;
1827 kmem_cache_free(btrfs_end_io_wq_cache
, end_io_wq
);
1831 static int cleaner_kthread(void *arg
)
1833 struct btrfs_root
*root
= arg
;
1834 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1836 struct btrfs_trans_handle
*trans
;
1841 /* Make the cleaner go to sleep early. */
1842 if (btrfs_need_cleaner_sleep(fs_info
))
1846 * Do not do anything if we might cause open_ctree() to block
1847 * before we have finished mounting the filesystem.
1849 if (!test_bit(BTRFS_FS_OPEN
, &fs_info
->flags
))
1852 if (!mutex_trylock(&fs_info
->cleaner_mutex
))
1856 * Avoid the problem that we change the status of the fs
1857 * during the above check and trylock.
1859 if (btrfs_need_cleaner_sleep(fs_info
)) {
1860 mutex_unlock(&fs_info
->cleaner_mutex
);
1864 mutex_lock(&fs_info
->cleaner_delayed_iput_mutex
);
1865 btrfs_run_delayed_iputs(fs_info
);
1866 mutex_unlock(&fs_info
->cleaner_delayed_iput_mutex
);
1868 again
= btrfs_clean_one_deleted_snapshot(root
);
1869 mutex_unlock(&fs_info
->cleaner_mutex
);
1872 * The defragger has dealt with the R/O remount and umount,
1873 * needn't do anything special here.
1875 btrfs_run_defrag_inodes(fs_info
);
1878 * Acquires fs_info->delete_unused_bgs_mutex to avoid racing
1879 * with relocation (btrfs_relocate_chunk) and relocation
1880 * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
1881 * after acquiring fs_info->delete_unused_bgs_mutex. So we
1882 * can't hold, nor need to, fs_info->cleaner_mutex when deleting
1883 * unused block groups.
1885 btrfs_delete_unused_bgs(fs_info
);
1888 set_current_state(TASK_INTERRUPTIBLE
);
1889 if (!kthread_should_stop())
1891 __set_current_state(TASK_RUNNING
);
1893 } while (!kthread_should_stop());
1896 * Transaction kthread is stopped before us and wakes us up.
1897 * However we might have started a new transaction and COWed some
1898 * tree blocks when deleting unused block groups for example. So
1899 * make sure we commit the transaction we started to have a clean
1900 * shutdown when evicting the btree inode - if it has dirty pages
1901 * when we do the final iput() on it, eviction will trigger a
1902 * writeback for it which will fail with null pointer dereferences
1903 * since work queues and other resources were already released and
1904 * destroyed by the time the iput/eviction/writeback is made.
1906 trans
= btrfs_attach_transaction(root
);
1907 if (IS_ERR(trans
)) {
1908 if (PTR_ERR(trans
) != -ENOENT
)
1910 "cleaner transaction attach returned %ld",
1915 ret
= btrfs_commit_transaction(trans
);
1918 "cleaner open transaction commit returned %d",
1925 static int transaction_kthread(void *arg
)
1927 struct btrfs_root
*root
= arg
;
1928 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1929 struct btrfs_trans_handle
*trans
;
1930 struct btrfs_transaction
*cur
;
1933 unsigned long delay
;
1937 cannot_commit
= false;
1938 delay
= HZ
* fs_info
->commit_interval
;
1939 mutex_lock(&fs_info
->transaction_kthread_mutex
);
1941 spin_lock(&fs_info
->trans_lock
);
1942 cur
= fs_info
->running_transaction
;
1944 spin_unlock(&fs_info
->trans_lock
);
1948 now
= get_seconds();
1949 if (cur
->state
< TRANS_STATE_BLOCKED
&&
1950 (now
< cur
->start_time
||
1951 now
- cur
->start_time
< fs_info
->commit_interval
)) {
1952 spin_unlock(&fs_info
->trans_lock
);
1956 transid
= cur
->transid
;
1957 spin_unlock(&fs_info
->trans_lock
);
1959 /* If the file system is aborted, this will always fail. */
1960 trans
= btrfs_attach_transaction(root
);
1961 if (IS_ERR(trans
)) {
1962 if (PTR_ERR(trans
) != -ENOENT
)
1963 cannot_commit
= true;
1966 if (transid
== trans
->transid
) {
1967 btrfs_commit_transaction(trans
);
1969 btrfs_end_transaction(trans
);
1972 wake_up_process(fs_info
->cleaner_kthread
);
1973 mutex_unlock(&fs_info
->transaction_kthread_mutex
);
1975 if (unlikely(test_bit(BTRFS_FS_STATE_ERROR
,
1976 &fs_info
->fs_state
)))
1977 btrfs_cleanup_transaction(fs_info
);
1978 set_current_state(TASK_INTERRUPTIBLE
);
1979 if (!kthread_should_stop() &&
1980 (!btrfs_transaction_blocked(fs_info
) ||
1982 schedule_timeout(delay
);
1983 __set_current_state(TASK_RUNNING
);
1984 } while (!kthread_should_stop());
1989 * this will find the highest generation in the array of
1990 * root backups. The index of the highest array is returned,
1991 * or -1 if we can't find anything.
1993 * We check to make sure the array is valid by comparing the
1994 * generation of the latest root in the array with the generation
1995 * in the super block. If they don't match we pitch it.
1997 static int find_newest_super_backup(struct btrfs_fs_info
*info
, u64 newest_gen
)
2000 int newest_index
= -1;
2001 struct btrfs_root_backup
*root_backup
;
2004 for (i
= 0; i
< BTRFS_NUM_BACKUP_ROOTS
; i
++) {
2005 root_backup
= info
->super_copy
->super_roots
+ i
;
2006 cur
= btrfs_backup_tree_root_gen(root_backup
);
2007 if (cur
== newest_gen
)
2011 /* check to see if we actually wrapped around */
2012 if (newest_index
== BTRFS_NUM_BACKUP_ROOTS
- 1) {
2013 root_backup
= info
->super_copy
->super_roots
;
2014 cur
= btrfs_backup_tree_root_gen(root_backup
);
2015 if (cur
== newest_gen
)
2018 return newest_index
;
2023 * find the oldest backup so we know where to store new entries
2024 * in the backup array. This will set the backup_root_index
2025 * field in the fs_info struct
2027 static void find_oldest_super_backup(struct btrfs_fs_info
*info
,
2030 int newest_index
= -1;
2032 newest_index
= find_newest_super_backup(info
, newest_gen
);
2033 /* if there was garbage in there, just move along */
2034 if (newest_index
== -1) {
2035 info
->backup_root_index
= 0;
2037 info
->backup_root_index
= (newest_index
+ 1) % BTRFS_NUM_BACKUP_ROOTS
;
2042 * copy all the root pointers into the super backup array.
2043 * this will bump the backup pointer by one when it is
2046 static void backup_super_roots(struct btrfs_fs_info
*info
)
2049 struct btrfs_root_backup
*root_backup
;
2052 next_backup
= info
->backup_root_index
;
2053 last_backup
= (next_backup
+ BTRFS_NUM_BACKUP_ROOTS
- 1) %
2054 BTRFS_NUM_BACKUP_ROOTS
;
2057 * just overwrite the last backup if we're at the same generation
2058 * this happens only at umount
2060 root_backup
= info
->super_for_commit
->super_roots
+ last_backup
;
2061 if (btrfs_backup_tree_root_gen(root_backup
) ==
2062 btrfs_header_generation(info
->tree_root
->node
))
2063 next_backup
= last_backup
;
2065 root_backup
= info
->super_for_commit
->super_roots
+ next_backup
;
2068 * make sure all of our padding and empty slots get zero filled
2069 * regardless of which ones we use today
2071 memset(root_backup
, 0, sizeof(*root_backup
));
2073 info
->backup_root_index
= (next_backup
+ 1) % BTRFS_NUM_BACKUP_ROOTS
;
2075 btrfs_set_backup_tree_root(root_backup
, info
->tree_root
->node
->start
);
2076 btrfs_set_backup_tree_root_gen(root_backup
,
2077 btrfs_header_generation(info
->tree_root
->node
));
2079 btrfs_set_backup_tree_root_level(root_backup
,
2080 btrfs_header_level(info
->tree_root
->node
));
2082 btrfs_set_backup_chunk_root(root_backup
, info
->chunk_root
->node
->start
);
2083 btrfs_set_backup_chunk_root_gen(root_backup
,
2084 btrfs_header_generation(info
->chunk_root
->node
));
2085 btrfs_set_backup_chunk_root_level(root_backup
,
2086 btrfs_header_level(info
->chunk_root
->node
));
2088 btrfs_set_backup_extent_root(root_backup
, info
->extent_root
->node
->start
);
2089 btrfs_set_backup_extent_root_gen(root_backup
,
2090 btrfs_header_generation(info
->extent_root
->node
));
2091 btrfs_set_backup_extent_root_level(root_backup
,
2092 btrfs_header_level(info
->extent_root
->node
));
2095 * we might commit during log recovery, which happens before we set
2096 * the fs_root. Make sure it is valid before we fill it in.
2098 if (info
->fs_root
&& info
->fs_root
->node
) {
2099 btrfs_set_backup_fs_root(root_backup
,
2100 info
->fs_root
->node
->start
);
2101 btrfs_set_backup_fs_root_gen(root_backup
,
2102 btrfs_header_generation(info
->fs_root
->node
));
2103 btrfs_set_backup_fs_root_level(root_backup
,
2104 btrfs_header_level(info
->fs_root
->node
));
2107 btrfs_set_backup_dev_root(root_backup
, info
->dev_root
->node
->start
);
2108 btrfs_set_backup_dev_root_gen(root_backup
,
2109 btrfs_header_generation(info
->dev_root
->node
));
2110 btrfs_set_backup_dev_root_level(root_backup
,
2111 btrfs_header_level(info
->dev_root
->node
));
2113 btrfs_set_backup_csum_root(root_backup
, info
->csum_root
->node
->start
);
2114 btrfs_set_backup_csum_root_gen(root_backup
,
2115 btrfs_header_generation(info
->csum_root
->node
));
2116 btrfs_set_backup_csum_root_level(root_backup
,
2117 btrfs_header_level(info
->csum_root
->node
));
2119 btrfs_set_backup_total_bytes(root_backup
,
2120 btrfs_super_total_bytes(info
->super_copy
));
2121 btrfs_set_backup_bytes_used(root_backup
,
2122 btrfs_super_bytes_used(info
->super_copy
));
2123 btrfs_set_backup_num_devices(root_backup
,
2124 btrfs_super_num_devices(info
->super_copy
));
2127 * if we don't copy this out to the super_copy, it won't get remembered
2128 * for the next commit
2130 memcpy(&info
->super_copy
->super_roots
,
2131 &info
->super_for_commit
->super_roots
,
2132 sizeof(*root_backup
) * BTRFS_NUM_BACKUP_ROOTS
);
2136 * this copies info out of the root backup array and back into
2137 * the in-memory super block. It is meant to help iterate through
2138 * the array, so you send it the number of backups you've already
2139 * tried and the last backup index you used.
2141 * this returns -1 when it has tried all the backups
2143 static noinline
int next_root_backup(struct btrfs_fs_info
*info
,
2144 struct btrfs_super_block
*super
,
2145 int *num_backups_tried
, int *backup_index
)
2147 struct btrfs_root_backup
*root_backup
;
2148 int newest
= *backup_index
;
2150 if (*num_backups_tried
== 0) {
2151 u64 gen
= btrfs_super_generation(super
);
2153 newest
= find_newest_super_backup(info
, gen
);
2157 *backup_index
= newest
;
2158 *num_backups_tried
= 1;
2159 } else if (*num_backups_tried
== BTRFS_NUM_BACKUP_ROOTS
) {
2160 /* we've tried all the backups, all done */
2163 /* jump to the next oldest backup */
2164 newest
= (*backup_index
+ BTRFS_NUM_BACKUP_ROOTS
- 1) %
2165 BTRFS_NUM_BACKUP_ROOTS
;
2166 *backup_index
= newest
;
2167 *num_backups_tried
+= 1;
2169 root_backup
= super
->super_roots
+ newest
;
2171 btrfs_set_super_generation(super
,
2172 btrfs_backup_tree_root_gen(root_backup
));
2173 btrfs_set_super_root(super
, btrfs_backup_tree_root(root_backup
));
2174 btrfs_set_super_root_level(super
,
2175 btrfs_backup_tree_root_level(root_backup
));
2176 btrfs_set_super_bytes_used(super
, btrfs_backup_bytes_used(root_backup
));
2179 * fixme: the total bytes and num_devices need to match or we should
2182 btrfs_set_super_total_bytes(super
, btrfs_backup_total_bytes(root_backup
));
2183 btrfs_set_super_num_devices(super
, btrfs_backup_num_devices(root_backup
));
2187 /* helper to cleanup workers */
2188 static void btrfs_stop_all_workers(struct btrfs_fs_info
*fs_info
)
2190 btrfs_destroy_workqueue(fs_info
->fixup_workers
);
2191 btrfs_destroy_workqueue(fs_info
->delalloc_workers
);
2192 btrfs_destroy_workqueue(fs_info
->workers
);
2193 btrfs_destroy_workqueue(fs_info
->endio_workers
);
2194 btrfs_destroy_workqueue(fs_info
->endio_raid56_workers
);
2195 btrfs_destroy_workqueue(fs_info
->endio_repair_workers
);
2196 btrfs_destroy_workqueue(fs_info
->rmw_workers
);
2197 btrfs_destroy_workqueue(fs_info
->endio_write_workers
);
2198 btrfs_destroy_workqueue(fs_info
->endio_freespace_worker
);
2199 btrfs_destroy_workqueue(fs_info
->submit_workers
);
2200 btrfs_destroy_workqueue(fs_info
->delayed_workers
);
2201 btrfs_destroy_workqueue(fs_info
->caching_workers
);
2202 btrfs_destroy_workqueue(fs_info
->readahead_workers
);
2203 btrfs_destroy_workqueue(fs_info
->flush_workers
);
2204 btrfs_destroy_workqueue(fs_info
->qgroup_rescan_workers
);
2205 btrfs_destroy_workqueue(fs_info
->extent_workers
);
2207 * Now that all other work queues are destroyed, we can safely destroy
2208 * the queues used for metadata I/O, since tasks from those other work
2209 * queues can do metadata I/O operations.
2211 btrfs_destroy_workqueue(fs_info
->endio_meta_workers
);
2212 btrfs_destroy_workqueue(fs_info
->endio_meta_write_workers
);
2215 static void free_root_extent_buffers(struct btrfs_root
*root
)
2218 free_extent_buffer(root
->node
);
2219 free_extent_buffer(root
->commit_root
);
2221 root
->commit_root
= NULL
;
2225 /* helper to cleanup tree roots */
2226 static void free_root_pointers(struct btrfs_fs_info
*info
, int chunk_root
)
2228 free_root_extent_buffers(info
->tree_root
);
2230 free_root_extent_buffers(info
->dev_root
);
2231 free_root_extent_buffers(info
->extent_root
);
2232 free_root_extent_buffers(info
->csum_root
);
2233 free_root_extent_buffers(info
->quota_root
);
2234 free_root_extent_buffers(info
->uuid_root
);
2236 free_root_extent_buffers(info
->chunk_root
);
2237 free_root_extent_buffers(info
->free_space_root
);
2240 void btrfs_free_fs_roots(struct btrfs_fs_info
*fs_info
)
2243 struct btrfs_root
*gang
[8];
2246 while (!list_empty(&fs_info
->dead_roots
)) {
2247 gang
[0] = list_entry(fs_info
->dead_roots
.next
,
2248 struct btrfs_root
, root_list
);
2249 list_del(&gang
[0]->root_list
);
2251 if (test_bit(BTRFS_ROOT_IN_RADIX
, &gang
[0]->state
)) {
2252 btrfs_drop_and_free_fs_root(fs_info
, gang
[0]);
2254 free_extent_buffer(gang
[0]->node
);
2255 free_extent_buffer(gang
[0]->commit_root
);
2256 btrfs_put_fs_root(gang
[0]);
2261 ret
= radix_tree_gang_lookup(&fs_info
->fs_roots_radix
,
2266 for (i
= 0; i
< ret
; i
++)
2267 btrfs_drop_and_free_fs_root(fs_info
, gang
[i
]);
2270 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
)) {
2271 btrfs_free_log_root_tree(NULL
, fs_info
);
2272 btrfs_destroy_pinned_extent(fs_info
, fs_info
->pinned_extents
);
2276 static void btrfs_init_scrub(struct btrfs_fs_info
*fs_info
)
2278 mutex_init(&fs_info
->scrub_lock
);
2279 atomic_set(&fs_info
->scrubs_running
, 0);
2280 atomic_set(&fs_info
->scrub_pause_req
, 0);
2281 atomic_set(&fs_info
->scrubs_paused
, 0);
2282 atomic_set(&fs_info
->scrub_cancel_req
, 0);
2283 init_waitqueue_head(&fs_info
->scrub_pause_wait
);
2284 fs_info
->scrub_workers_refcnt
= 0;
2287 static void btrfs_init_balance(struct btrfs_fs_info
*fs_info
)
2289 spin_lock_init(&fs_info
->balance_lock
);
2290 mutex_init(&fs_info
->balance_mutex
);
2291 atomic_set(&fs_info
->balance_running
, 0);
2292 atomic_set(&fs_info
->balance_pause_req
, 0);
2293 atomic_set(&fs_info
->balance_cancel_req
, 0);
2294 fs_info
->balance_ctl
= NULL
;
2295 init_waitqueue_head(&fs_info
->balance_wait_q
);
2298 static void btrfs_init_btree_inode(struct btrfs_fs_info
*fs_info
)
2300 struct inode
*inode
= fs_info
->btree_inode
;
2302 inode
->i_ino
= BTRFS_BTREE_INODE_OBJECTID
;
2303 set_nlink(inode
, 1);
2305 * we set the i_size on the btree inode to the max possible int.
2306 * the real end of the address space is determined by all of
2307 * the devices in the system
2309 inode
->i_size
= OFFSET_MAX
;
2310 inode
->i_mapping
->a_ops
= &btree_aops
;
2312 RB_CLEAR_NODE(&BTRFS_I(inode
)->rb_node
);
2313 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
, inode
);
2314 BTRFS_I(inode
)->io_tree
.track_uptodate
= 0;
2315 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
);
2317 BTRFS_I(inode
)->io_tree
.ops
= &btree_extent_io_ops
;
2319 BTRFS_I(inode
)->root
= fs_info
->tree_root
;
2320 memset(&BTRFS_I(inode
)->location
, 0, sizeof(struct btrfs_key
));
2321 set_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
);
2322 btrfs_insert_inode_hash(inode
);
2325 static void btrfs_init_dev_replace_locks(struct btrfs_fs_info
*fs_info
)
2327 fs_info
->dev_replace
.lock_owner
= 0;
2328 atomic_set(&fs_info
->dev_replace
.nesting_level
, 0);
2329 mutex_init(&fs_info
->dev_replace
.lock_finishing_cancel_unmount
);
2330 rwlock_init(&fs_info
->dev_replace
.lock
);
2331 atomic_set(&fs_info
->dev_replace
.read_locks
, 0);
2332 atomic_set(&fs_info
->dev_replace
.blocking_readers
, 0);
2333 init_waitqueue_head(&fs_info
->replace_wait
);
2334 init_waitqueue_head(&fs_info
->dev_replace
.read_lock_wq
);
2337 static void btrfs_init_qgroup(struct btrfs_fs_info
*fs_info
)
2339 spin_lock_init(&fs_info
->qgroup_lock
);
2340 mutex_init(&fs_info
->qgroup_ioctl_lock
);
2341 fs_info
->qgroup_tree
= RB_ROOT
;
2342 fs_info
->qgroup_op_tree
= RB_ROOT
;
2343 INIT_LIST_HEAD(&fs_info
->dirty_qgroups
);
2344 fs_info
->qgroup_seq
= 1;
2345 fs_info
->qgroup_ulist
= NULL
;
2346 fs_info
->qgroup_rescan_running
= false;
2347 mutex_init(&fs_info
->qgroup_rescan_lock
);
2350 static int btrfs_init_workqueues(struct btrfs_fs_info
*fs_info
,
2351 struct btrfs_fs_devices
*fs_devices
)
2353 int max_active
= fs_info
->thread_pool_size
;
2354 unsigned int flags
= WQ_MEM_RECLAIM
| WQ_FREEZABLE
| WQ_UNBOUND
;
2357 btrfs_alloc_workqueue(fs_info
, "worker",
2358 flags
| WQ_HIGHPRI
, max_active
, 16);
2360 fs_info
->delalloc_workers
=
2361 btrfs_alloc_workqueue(fs_info
, "delalloc",
2362 flags
, max_active
, 2);
2364 fs_info
->flush_workers
=
2365 btrfs_alloc_workqueue(fs_info
, "flush_delalloc",
2366 flags
, max_active
, 0);
2368 fs_info
->caching_workers
=
2369 btrfs_alloc_workqueue(fs_info
, "cache", flags
, max_active
, 0);
2372 * a higher idle thresh on the submit workers makes it much more
2373 * likely that bios will be send down in a sane order to the
2376 fs_info
->submit_workers
=
2377 btrfs_alloc_workqueue(fs_info
, "submit", flags
,
2378 min_t(u64
, fs_devices
->num_devices
,
2381 fs_info
->fixup_workers
=
2382 btrfs_alloc_workqueue(fs_info
, "fixup", flags
, 1, 0);
2385 * endios are largely parallel and should have a very
2388 fs_info
->endio_workers
=
2389 btrfs_alloc_workqueue(fs_info
, "endio", flags
, max_active
, 4);
2390 fs_info
->endio_meta_workers
=
2391 btrfs_alloc_workqueue(fs_info
, "endio-meta", flags
,
2393 fs_info
->endio_meta_write_workers
=
2394 btrfs_alloc_workqueue(fs_info
, "endio-meta-write", flags
,
2396 fs_info
->endio_raid56_workers
=
2397 btrfs_alloc_workqueue(fs_info
, "endio-raid56", flags
,
2399 fs_info
->endio_repair_workers
=
2400 btrfs_alloc_workqueue(fs_info
, "endio-repair", flags
, 1, 0);
2401 fs_info
->rmw_workers
=
2402 btrfs_alloc_workqueue(fs_info
, "rmw", flags
, max_active
, 2);
2403 fs_info
->endio_write_workers
=
2404 btrfs_alloc_workqueue(fs_info
, "endio-write", flags
,
2406 fs_info
->endio_freespace_worker
=
2407 btrfs_alloc_workqueue(fs_info
, "freespace-write", flags
,
2409 fs_info
->delayed_workers
=
2410 btrfs_alloc_workqueue(fs_info
, "delayed-meta", flags
,
2412 fs_info
->readahead_workers
=
2413 btrfs_alloc_workqueue(fs_info
, "readahead", flags
,
2415 fs_info
->qgroup_rescan_workers
=
2416 btrfs_alloc_workqueue(fs_info
, "qgroup-rescan", flags
, 1, 0);
2417 fs_info
->extent_workers
=
2418 btrfs_alloc_workqueue(fs_info
, "extent-refs", flags
,
2419 min_t(u64
, fs_devices
->num_devices
,
2422 if (!(fs_info
->workers
&& fs_info
->delalloc_workers
&&
2423 fs_info
->submit_workers
&& fs_info
->flush_workers
&&
2424 fs_info
->endio_workers
&& fs_info
->endio_meta_workers
&&
2425 fs_info
->endio_meta_write_workers
&&
2426 fs_info
->endio_repair_workers
&&
2427 fs_info
->endio_write_workers
&& fs_info
->endio_raid56_workers
&&
2428 fs_info
->endio_freespace_worker
&& fs_info
->rmw_workers
&&
2429 fs_info
->caching_workers
&& fs_info
->readahead_workers
&&
2430 fs_info
->fixup_workers
&& fs_info
->delayed_workers
&&
2431 fs_info
->extent_workers
&&
2432 fs_info
->qgroup_rescan_workers
)) {
2439 static int btrfs_replay_log(struct btrfs_fs_info
*fs_info
,
2440 struct btrfs_fs_devices
*fs_devices
)
2443 struct btrfs_root
*log_tree_root
;
2444 struct btrfs_super_block
*disk_super
= fs_info
->super_copy
;
2445 u64 bytenr
= btrfs_super_log_root(disk_super
);
2447 if (fs_devices
->rw_devices
== 0) {
2448 btrfs_warn(fs_info
, "log replay required on RO media");
2452 log_tree_root
= btrfs_alloc_root(fs_info
, GFP_KERNEL
);
2456 __setup_root(log_tree_root
, fs_info
, BTRFS_TREE_LOG_OBJECTID
);
2458 log_tree_root
->node
= read_tree_block(fs_info
, bytenr
,
2459 fs_info
->generation
+ 1);
2460 if (IS_ERR(log_tree_root
->node
)) {
2461 btrfs_warn(fs_info
, "failed to read log tree");
2462 ret
= PTR_ERR(log_tree_root
->node
);
2463 kfree(log_tree_root
);
2465 } else if (!extent_buffer_uptodate(log_tree_root
->node
)) {
2466 btrfs_err(fs_info
, "failed to read log tree");
2467 free_extent_buffer(log_tree_root
->node
);
2468 kfree(log_tree_root
);
2471 /* returns with log_tree_root freed on success */
2472 ret
= btrfs_recover_log_trees(log_tree_root
);
2474 btrfs_handle_fs_error(fs_info
, ret
,
2475 "Failed to recover log tree");
2476 free_extent_buffer(log_tree_root
->node
);
2477 kfree(log_tree_root
);
2481 if (fs_info
->sb
->s_flags
& MS_RDONLY
) {
2482 ret
= btrfs_commit_super(fs_info
);
2490 static int btrfs_read_roots(struct btrfs_fs_info
*fs_info
)
2492 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
2493 struct btrfs_root
*root
;
2494 struct btrfs_key location
;
2497 BUG_ON(!fs_info
->tree_root
);
2499 location
.objectid
= BTRFS_EXTENT_TREE_OBJECTID
;
2500 location
.type
= BTRFS_ROOT_ITEM_KEY
;
2501 location
.offset
= 0;
2503 root
= btrfs_read_tree_root(tree_root
, &location
);
2505 return PTR_ERR(root
);
2506 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2507 fs_info
->extent_root
= root
;
2509 location
.objectid
= BTRFS_DEV_TREE_OBJECTID
;
2510 root
= btrfs_read_tree_root(tree_root
, &location
);
2512 return PTR_ERR(root
);
2513 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2514 fs_info
->dev_root
= root
;
2515 btrfs_init_devices_late(fs_info
);
2517 location
.objectid
= BTRFS_CSUM_TREE_OBJECTID
;
2518 root
= btrfs_read_tree_root(tree_root
, &location
);
2520 return PTR_ERR(root
);
2521 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2522 fs_info
->csum_root
= root
;
2524 location
.objectid
= BTRFS_QUOTA_TREE_OBJECTID
;
2525 root
= btrfs_read_tree_root(tree_root
, &location
);
2526 if (!IS_ERR(root
)) {
2527 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2528 set_bit(BTRFS_FS_QUOTA_ENABLED
, &fs_info
->flags
);
2529 fs_info
->quota_root
= root
;
2532 location
.objectid
= BTRFS_UUID_TREE_OBJECTID
;
2533 root
= btrfs_read_tree_root(tree_root
, &location
);
2535 ret
= PTR_ERR(root
);
2539 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2540 fs_info
->uuid_root
= root
;
2543 if (btrfs_fs_compat_ro(fs_info
, FREE_SPACE_TREE
)) {
2544 location
.objectid
= BTRFS_FREE_SPACE_TREE_OBJECTID
;
2545 root
= btrfs_read_tree_root(tree_root
, &location
);
2547 return PTR_ERR(root
);
2548 set_bit(BTRFS_ROOT_TRACK_DIRTY
, &root
->state
);
2549 fs_info
->free_space_root
= root
;
2555 int open_ctree(struct super_block
*sb
,
2556 struct btrfs_fs_devices
*fs_devices
,
2564 struct btrfs_key location
;
2565 struct buffer_head
*bh
;
2566 struct btrfs_super_block
*disk_super
;
2567 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
2568 struct btrfs_root
*tree_root
;
2569 struct btrfs_root
*chunk_root
;
2572 int num_backups_tried
= 0;
2573 int backup_index
= 0;
2575 int clear_free_space_tree
= 0;
2577 tree_root
= fs_info
->tree_root
= btrfs_alloc_root(fs_info
, GFP_KERNEL
);
2578 chunk_root
= fs_info
->chunk_root
= btrfs_alloc_root(fs_info
, GFP_KERNEL
);
2579 if (!tree_root
|| !chunk_root
) {
2584 ret
= init_srcu_struct(&fs_info
->subvol_srcu
);
2590 ret
= percpu_counter_init(&fs_info
->dirty_metadata_bytes
, 0, GFP_KERNEL
);
2595 fs_info
->dirty_metadata_batch
= PAGE_SIZE
*
2596 (1 + ilog2(nr_cpu_ids
));
2598 ret
= percpu_counter_init(&fs_info
->delalloc_bytes
, 0, GFP_KERNEL
);
2601 goto fail_dirty_metadata_bytes
;
2604 ret
= percpu_counter_init(&fs_info
->bio_counter
, 0, GFP_KERNEL
);
2607 goto fail_delalloc_bytes
;
2610 fs_info
->btree_inode
= new_inode(sb
);
2611 if (!fs_info
->btree_inode
) {
2613 goto fail_bio_counter
;
2616 mapping_set_gfp_mask(fs_info
->btree_inode
->i_mapping
, GFP_NOFS
);
2618 INIT_RADIX_TREE(&fs_info
->fs_roots_radix
, GFP_ATOMIC
);
2619 INIT_RADIX_TREE(&fs_info
->buffer_radix
, GFP_ATOMIC
);
2620 INIT_LIST_HEAD(&fs_info
->trans_list
);
2621 INIT_LIST_HEAD(&fs_info
->dead_roots
);
2622 INIT_LIST_HEAD(&fs_info
->delayed_iputs
);
2623 INIT_LIST_HEAD(&fs_info
->delalloc_roots
);
2624 INIT_LIST_HEAD(&fs_info
->caching_block_groups
);
2625 spin_lock_init(&fs_info
->delalloc_root_lock
);
2626 spin_lock_init(&fs_info
->trans_lock
);
2627 spin_lock_init(&fs_info
->fs_roots_radix_lock
);
2628 spin_lock_init(&fs_info
->delayed_iput_lock
);
2629 spin_lock_init(&fs_info
->defrag_inodes_lock
);
2630 spin_lock_init(&fs_info
->tree_mod_seq_lock
);
2631 spin_lock_init(&fs_info
->super_lock
);
2632 spin_lock_init(&fs_info
->qgroup_op_lock
);
2633 spin_lock_init(&fs_info
->buffer_lock
);
2634 spin_lock_init(&fs_info
->unused_bgs_lock
);
2635 rwlock_init(&fs_info
->tree_mod_log_lock
);
2636 mutex_init(&fs_info
->unused_bg_unpin_mutex
);
2637 mutex_init(&fs_info
->delete_unused_bgs_mutex
);
2638 mutex_init(&fs_info
->reloc_mutex
);
2639 mutex_init(&fs_info
->delalloc_root_mutex
);
2640 mutex_init(&fs_info
->cleaner_delayed_iput_mutex
);
2641 seqlock_init(&fs_info
->profiles_lock
);
2643 INIT_LIST_HEAD(&fs_info
->dirty_cowonly_roots
);
2644 INIT_LIST_HEAD(&fs_info
->space_info
);
2645 INIT_LIST_HEAD(&fs_info
->tree_mod_seq_list
);
2646 INIT_LIST_HEAD(&fs_info
->unused_bgs
);
2647 btrfs_mapping_init(&fs_info
->mapping_tree
);
2648 btrfs_init_block_rsv(&fs_info
->global_block_rsv
,
2649 BTRFS_BLOCK_RSV_GLOBAL
);
2650 btrfs_init_block_rsv(&fs_info
->delalloc_block_rsv
,
2651 BTRFS_BLOCK_RSV_DELALLOC
);
2652 btrfs_init_block_rsv(&fs_info
->trans_block_rsv
, BTRFS_BLOCK_RSV_TRANS
);
2653 btrfs_init_block_rsv(&fs_info
->chunk_block_rsv
, BTRFS_BLOCK_RSV_CHUNK
);
2654 btrfs_init_block_rsv(&fs_info
->empty_block_rsv
, BTRFS_BLOCK_RSV_EMPTY
);
2655 btrfs_init_block_rsv(&fs_info
->delayed_block_rsv
,
2656 BTRFS_BLOCK_RSV_DELOPS
);
2657 atomic_set(&fs_info
->nr_async_submits
, 0);
2658 atomic_set(&fs_info
->async_delalloc_pages
, 0);
2659 atomic_set(&fs_info
->async_submit_draining
, 0);
2660 atomic_set(&fs_info
->nr_async_bios
, 0);
2661 atomic_set(&fs_info
->defrag_running
, 0);
2662 atomic_set(&fs_info
->qgroup_op_seq
, 0);
2663 atomic_set(&fs_info
->reada_works_cnt
, 0);
2664 atomic64_set(&fs_info
->tree_mod_seq
, 0);
2666 fs_info
->max_inline
= BTRFS_DEFAULT_MAX_INLINE
;
2667 fs_info
->metadata_ratio
= 0;
2668 fs_info
->defrag_inodes
= RB_ROOT
;
2669 atomic64_set(&fs_info
->free_chunk_space
, 0);
2670 fs_info
->tree_mod_log
= RB_ROOT
;
2671 fs_info
->commit_interval
= BTRFS_DEFAULT_COMMIT_INTERVAL
;
2672 fs_info
->avg_delayed_ref_runtime
= NSEC_PER_SEC
>> 6; /* div by 64 */
2673 /* readahead state */
2674 INIT_RADIX_TREE(&fs_info
->reada_tree
, GFP_NOFS
& ~__GFP_DIRECT_RECLAIM
);
2675 spin_lock_init(&fs_info
->reada_lock
);
2677 fs_info
->thread_pool_size
= min_t(unsigned long,
2678 num_online_cpus() + 2, 8);
2680 INIT_LIST_HEAD(&fs_info
->ordered_roots
);
2681 spin_lock_init(&fs_info
->ordered_root_lock
);
2682 fs_info
->delayed_root
= kmalloc(sizeof(struct btrfs_delayed_root
),
2684 if (!fs_info
->delayed_root
) {
2688 btrfs_init_delayed_root(fs_info
->delayed_root
);
2690 btrfs_init_scrub(fs_info
);
2691 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2692 fs_info
->check_integrity_print_mask
= 0;
2694 btrfs_init_balance(fs_info
);
2695 btrfs_init_async_reclaim_work(&fs_info
->async_reclaim_work
);
2697 sb
->s_blocksize
= 4096;
2698 sb
->s_blocksize_bits
= blksize_bits(4096);
2700 btrfs_init_btree_inode(fs_info
);
2702 spin_lock_init(&fs_info
->block_group_cache_lock
);
2703 fs_info
->block_group_cache_tree
= RB_ROOT
;
2704 fs_info
->first_logical_byte
= (u64
)-1;
2706 extent_io_tree_init(&fs_info
->freed_extents
[0], NULL
);
2707 extent_io_tree_init(&fs_info
->freed_extents
[1], NULL
);
2708 fs_info
->pinned_extents
= &fs_info
->freed_extents
[0];
2709 set_bit(BTRFS_FS_BARRIER
, &fs_info
->flags
);
2711 mutex_init(&fs_info
->ordered_operations_mutex
);
2712 mutex_init(&fs_info
->tree_log_mutex
);
2713 mutex_init(&fs_info
->chunk_mutex
);
2714 mutex_init(&fs_info
->transaction_kthread_mutex
);
2715 mutex_init(&fs_info
->cleaner_mutex
);
2716 mutex_init(&fs_info
->volume_mutex
);
2717 mutex_init(&fs_info
->ro_block_group_mutex
);
2718 init_rwsem(&fs_info
->commit_root_sem
);
2719 init_rwsem(&fs_info
->cleanup_work_sem
);
2720 init_rwsem(&fs_info
->subvol_sem
);
2721 sema_init(&fs_info
->uuid_tree_rescan_sem
, 1);
2723 btrfs_init_dev_replace_locks(fs_info
);
2724 btrfs_init_qgroup(fs_info
);
2726 btrfs_init_free_cluster(&fs_info
->meta_alloc_cluster
);
2727 btrfs_init_free_cluster(&fs_info
->data_alloc_cluster
);
2729 init_waitqueue_head(&fs_info
->transaction_throttle
);
2730 init_waitqueue_head(&fs_info
->transaction_wait
);
2731 init_waitqueue_head(&fs_info
->transaction_blocked_wait
);
2732 init_waitqueue_head(&fs_info
->async_submit_wait
);
2734 INIT_LIST_HEAD(&fs_info
->pinned_chunks
);
2736 /* Usable values until the real ones are cached from the superblock */
2737 fs_info
->nodesize
= 4096;
2738 fs_info
->sectorsize
= 4096;
2739 fs_info
->stripesize
= 4096;
2741 ret
= btrfs_alloc_stripe_hash_table(fs_info
);
2747 __setup_root(tree_root
, fs_info
, BTRFS_ROOT_TREE_OBJECTID
);
2749 invalidate_bdev(fs_devices
->latest_bdev
);
2752 * Read super block and check the signature bytes only
2754 bh
= btrfs_read_dev_super(fs_devices
->latest_bdev
);
2761 * We want to check superblock checksum, the type is stored inside.
2762 * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
2764 if (btrfs_check_super_csum(fs_info
, bh
->b_data
)) {
2765 btrfs_err(fs_info
, "superblock checksum mismatch");
2772 * super_copy is zeroed at allocation time and we never touch the
2773 * following bytes up to INFO_SIZE, the checksum is calculated from
2774 * the whole block of INFO_SIZE
2776 memcpy(fs_info
->super_copy
, bh
->b_data
, sizeof(*fs_info
->super_copy
));
2777 memcpy(fs_info
->super_for_commit
, fs_info
->super_copy
,
2778 sizeof(*fs_info
->super_for_commit
));
2781 memcpy(fs_info
->fsid
, fs_info
->super_copy
->fsid
, BTRFS_FSID_SIZE
);
2783 ret
= btrfs_check_super_valid(fs_info
);
2785 btrfs_err(fs_info
, "superblock contains fatal errors");
2790 disk_super
= fs_info
->super_copy
;
2791 if (!btrfs_super_root(disk_super
))
2794 /* check FS state, whether FS is broken. */
2795 if (btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_ERROR
)
2796 set_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
);
2799 * run through our array of backup supers and setup
2800 * our ring pointer to the oldest one
2802 generation
= btrfs_super_generation(disk_super
);
2803 find_oldest_super_backup(fs_info
, generation
);
2806 * In the long term, we'll store the compression type in the super
2807 * block, and it'll be used for per file compression control.
2809 fs_info
->compress_type
= BTRFS_COMPRESS_ZLIB
;
2811 ret
= btrfs_parse_options(fs_info
, options
, sb
->s_flags
);
2817 features
= btrfs_super_incompat_flags(disk_super
) &
2818 ~BTRFS_FEATURE_INCOMPAT_SUPP
;
2821 "cannot mount because of unsupported optional features (%llx)",
2827 features
= btrfs_super_incompat_flags(disk_super
);
2828 features
|= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
;
2829 if (fs_info
->compress_type
== BTRFS_COMPRESS_LZO
)
2830 features
|= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO
;
2832 if (features
& BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA
)
2833 btrfs_info(fs_info
, "has skinny extents");
2836 * flag our filesystem as having big metadata blocks if
2837 * they are bigger than the page size
2839 if (btrfs_super_nodesize(disk_super
) > PAGE_SIZE
) {
2840 if (!(features
& BTRFS_FEATURE_INCOMPAT_BIG_METADATA
))
2842 "flagging fs with big metadata feature");
2843 features
|= BTRFS_FEATURE_INCOMPAT_BIG_METADATA
;
2846 nodesize
= btrfs_super_nodesize(disk_super
);
2847 sectorsize
= btrfs_super_sectorsize(disk_super
);
2848 stripesize
= sectorsize
;
2849 fs_info
->dirty_metadata_batch
= nodesize
* (1 + ilog2(nr_cpu_ids
));
2850 fs_info
->delalloc_batch
= sectorsize
* 512 * (1 + ilog2(nr_cpu_ids
));
2852 /* Cache block sizes */
2853 fs_info
->nodesize
= nodesize
;
2854 fs_info
->sectorsize
= sectorsize
;
2855 fs_info
->stripesize
= stripesize
;
2858 * mixed block groups end up with duplicate but slightly offset
2859 * extent buffers for the same range. It leads to corruptions
2861 if ((features
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
) &&
2862 (sectorsize
!= nodesize
)) {
2864 "unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
2865 nodesize
, sectorsize
);
2870 * Needn't use the lock because there is no other task which will
2873 btrfs_set_super_incompat_flags(disk_super
, features
);
2875 features
= btrfs_super_compat_ro_flags(disk_super
) &
2876 ~BTRFS_FEATURE_COMPAT_RO_SUPP
;
2877 if (!(sb
->s_flags
& MS_RDONLY
) && features
) {
2879 "cannot mount read-write because of unsupported optional features (%llx)",
2885 max_active
= fs_info
->thread_pool_size
;
2887 ret
= btrfs_init_workqueues(fs_info
, fs_devices
);
2890 goto fail_sb_buffer
;
2893 sb
->s_bdi
->congested_fn
= btrfs_congested_fn
;
2894 sb
->s_bdi
->congested_data
= fs_info
;
2895 sb
->s_bdi
->capabilities
|= BDI_CAP_CGROUP_WRITEBACK
;
2896 sb
->s_bdi
->ra_pages
= VM_MAX_READAHEAD
* 1024 / PAGE_SIZE
;
2897 sb
->s_bdi
->ra_pages
*= btrfs_super_num_devices(disk_super
);
2898 sb
->s_bdi
->ra_pages
= max(sb
->s_bdi
->ra_pages
, SZ_4M
/ PAGE_SIZE
);
2900 sb
->s_blocksize
= sectorsize
;
2901 sb
->s_blocksize_bits
= blksize_bits(sectorsize
);
2903 mutex_lock(&fs_info
->chunk_mutex
);
2904 ret
= btrfs_read_sys_array(fs_info
);
2905 mutex_unlock(&fs_info
->chunk_mutex
);
2907 btrfs_err(fs_info
, "failed to read the system array: %d", ret
);
2908 goto fail_sb_buffer
;
2911 generation
= btrfs_super_chunk_root_generation(disk_super
);
2913 __setup_root(chunk_root
, fs_info
, BTRFS_CHUNK_TREE_OBJECTID
);
2915 chunk_root
->node
= read_tree_block(fs_info
,
2916 btrfs_super_chunk_root(disk_super
),
2918 if (IS_ERR(chunk_root
->node
) ||
2919 !extent_buffer_uptodate(chunk_root
->node
)) {
2920 btrfs_err(fs_info
, "failed to read chunk root");
2921 if (!IS_ERR(chunk_root
->node
))
2922 free_extent_buffer(chunk_root
->node
);
2923 chunk_root
->node
= NULL
;
2924 goto fail_tree_roots
;
2926 btrfs_set_root_node(&chunk_root
->root_item
, chunk_root
->node
);
2927 chunk_root
->commit_root
= btrfs_root_node(chunk_root
);
2929 read_extent_buffer(chunk_root
->node
, fs_info
->chunk_tree_uuid
,
2930 btrfs_header_chunk_tree_uuid(chunk_root
->node
), BTRFS_UUID_SIZE
);
2932 ret
= btrfs_read_chunk_tree(fs_info
);
2934 btrfs_err(fs_info
, "failed to read chunk tree: %d", ret
);
2935 goto fail_tree_roots
;
2939 * keep the device that is marked to be the target device for the
2940 * dev_replace procedure
2942 btrfs_close_extra_devices(fs_devices
, 0);
2944 if (!fs_devices
->latest_bdev
) {
2945 btrfs_err(fs_info
, "failed to read devices");
2946 goto fail_tree_roots
;
2950 generation
= btrfs_super_generation(disk_super
);
2952 tree_root
->node
= read_tree_block(fs_info
,
2953 btrfs_super_root(disk_super
),
2955 if (IS_ERR(tree_root
->node
) ||
2956 !extent_buffer_uptodate(tree_root
->node
)) {
2957 btrfs_warn(fs_info
, "failed to read tree root");
2958 if (!IS_ERR(tree_root
->node
))
2959 free_extent_buffer(tree_root
->node
);
2960 tree_root
->node
= NULL
;
2961 goto recovery_tree_root
;
2964 btrfs_set_root_node(&tree_root
->root_item
, tree_root
->node
);
2965 tree_root
->commit_root
= btrfs_root_node(tree_root
);
2966 btrfs_set_root_refs(&tree_root
->root_item
, 1);
2968 mutex_lock(&tree_root
->objectid_mutex
);
2969 ret
= btrfs_find_highest_objectid(tree_root
,
2970 &tree_root
->highest_objectid
);
2972 mutex_unlock(&tree_root
->objectid_mutex
);
2973 goto recovery_tree_root
;
2976 ASSERT(tree_root
->highest_objectid
<= BTRFS_LAST_FREE_OBJECTID
);
2978 mutex_unlock(&tree_root
->objectid_mutex
);
2980 ret
= btrfs_read_roots(fs_info
);
2982 goto recovery_tree_root
;
2984 fs_info
->generation
= generation
;
2985 fs_info
->last_trans_committed
= generation
;
2987 ret
= btrfs_recover_balance(fs_info
);
2989 btrfs_err(fs_info
, "failed to recover balance: %d", ret
);
2990 goto fail_block_groups
;
2993 ret
= btrfs_init_dev_stats(fs_info
);
2995 btrfs_err(fs_info
, "failed to init dev_stats: %d", ret
);
2996 goto fail_block_groups
;
2999 ret
= btrfs_init_dev_replace(fs_info
);
3001 btrfs_err(fs_info
, "failed to init dev_replace: %d", ret
);
3002 goto fail_block_groups
;
3005 btrfs_close_extra_devices(fs_devices
, 1);
3007 ret
= btrfs_sysfs_add_fsid(fs_devices
, NULL
);
3009 btrfs_err(fs_info
, "failed to init sysfs fsid interface: %d",
3011 goto fail_block_groups
;
3014 ret
= btrfs_sysfs_add_device(fs_devices
);
3016 btrfs_err(fs_info
, "failed to init sysfs device interface: %d",
3018 goto fail_fsdev_sysfs
;
3021 ret
= btrfs_sysfs_add_mounted(fs_info
);
3023 btrfs_err(fs_info
, "failed to init sysfs interface: %d", ret
);
3024 goto fail_fsdev_sysfs
;
3027 ret
= btrfs_init_space_info(fs_info
);
3029 btrfs_err(fs_info
, "failed to initialize space info: %d", ret
);
3033 ret
= btrfs_read_block_groups(fs_info
);
3035 btrfs_err(fs_info
, "failed to read block groups: %d", ret
);
3038 fs_info
->num_tolerated_disk_barrier_failures
=
3039 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info
);
3040 if (fs_info
->fs_devices
->missing_devices
>
3041 fs_info
->num_tolerated_disk_barrier_failures
&&
3042 !(sb
->s_flags
& MS_RDONLY
)) {
3044 "missing devices (%llu) exceeds the limit (%d), writeable mount is not allowed",
3045 fs_info
->fs_devices
->missing_devices
,
3046 fs_info
->num_tolerated_disk_barrier_failures
);
3050 fs_info
->cleaner_kthread
= kthread_run(cleaner_kthread
, tree_root
,
3052 if (IS_ERR(fs_info
->cleaner_kthread
))
3055 fs_info
->transaction_kthread
= kthread_run(transaction_kthread
,
3057 "btrfs-transaction");
3058 if (IS_ERR(fs_info
->transaction_kthread
))
3061 if (!btrfs_test_opt(fs_info
, SSD
) &&
3062 !btrfs_test_opt(fs_info
, NOSSD
) &&
3063 !fs_info
->fs_devices
->rotating
) {
3064 btrfs_info(fs_info
, "detected SSD devices, enabling SSD mode");
3065 btrfs_set_opt(fs_info
->mount_opt
, SSD
);
3069 * Mount does not set all options immediately, we can do it now and do
3070 * not have to wait for transaction commit
3072 btrfs_apply_pending_changes(fs_info
);
3074 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3075 if (btrfs_test_opt(fs_info
, CHECK_INTEGRITY
)) {
3076 ret
= btrfsic_mount(fs_info
, fs_devices
,
3077 btrfs_test_opt(fs_info
,
3078 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA
) ?
3080 fs_info
->check_integrity_print_mask
);
3083 "failed to initialize integrity check module: %d",
3087 ret
= btrfs_read_qgroup_config(fs_info
);
3089 goto fail_trans_kthread
;
3091 /* do not make disk changes in broken FS or nologreplay is given */
3092 if (btrfs_super_log_root(disk_super
) != 0 &&
3093 !btrfs_test_opt(fs_info
, NOLOGREPLAY
)) {
3094 ret
= btrfs_replay_log(fs_info
, fs_devices
);
3101 ret
= btrfs_find_orphan_roots(fs_info
);
3105 if (!(sb
->s_flags
& MS_RDONLY
)) {
3106 ret
= btrfs_cleanup_fs_roots(fs_info
);
3110 mutex_lock(&fs_info
->cleaner_mutex
);
3111 ret
= btrfs_recover_relocation(tree_root
);
3112 mutex_unlock(&fs_info
->cleaner_mutex
);
3114 btrfs_warn(fs_info
, "failed to recover relocation: %d",
3121 location
.objectid
= BTRFS_FS_TREE_OBJECTID
;
3122 location
.type
= BTRFS_ROOT_ITEM_KEY
;
3123 location
.offset
= 0;
3125 fs_info
->fs_root
= btrfs_read_fs_root_no_name(fs_info
, &location
);
3126 if (IS_ERR(fs_info
->fs_root
)) {
3127 err
= PTR_ERR(fs_info
->fs_root
);
3131 if (sb
->s_flags
& MS_RDONLY
)
3134 if (btrfs_test_opt(fs_info
, CLEAR_CACHE
) &&
3135 btrfs_fs_compat_ro(fs_info
, FREE_SPACE_TREE
)) {
3136 clear_free_space_tree
= 1;
3137 } else if (btrfs_fs_compat_ro(fs_info
, FREE_SPACE_TREE
) &&
3138 !btrfs_fs_compat_ro(fs_info
, FREE_SPACE_TREE_VALID
)) {
3139 btrfs_warn(fs_info
, "free space tree is invalid");
3140 clear_free_space_tree
= 1;
3143 if (clear_free_space_tree
) {
3144 btrfs_info(fs_info
, "clearing free space tree");
3145 ret
= btrfs_clear_free_space_tree(fs_info
);
3148 "failed to clear free space tree: %d", ret
);
3149 close_ctree(fs_info
);
3154 if (btrfs_test_opt(fs_info
, FREE_SPACE_TREE
) &&
3155 !btrfs_fs_compat_ro(fs_info
, FREE_SPACE_TREE
)) {
3156 btrfs_info(fs_info
, "creating free space tree");
3157 ret
= btrfs_create_free_space_tree(fs_info
);
3160 "failed to create free space tree: %d", ret
);
3161 close_ctree(fs_info
);
3166 down_read(&fs_info
->cleanup_work_sem
);
3167 if ((ret
= btrfs_orphan_cleanup(fs_info
->fs_root
)) ||
3168 (ret
= btrfs_orphan_cleanup(fs_info
->tree_root
))) {
3169 up_read(&fs_info
->cleanup_work_sem
);
3170 close_ctree(fs_info
);
3173 up_read(&fs_info
->cleanup_work_sem
);
3175 ret
= btrfs_resume_balance_async(fs_info
);
3177 btrfs_warn(fs_info
, "failed to resume balance: %d", ret
);
3178 close_ctree(fs_info
);
3182 ret
= btrfs_resume_dev_replace_async(fs_info
);
3184 btrfs_warn(fs_info
, "failed to resume device replace: %d", ret
);
3185 close_ctree(fs_info
);
3189 btrfs_qgroup_rescan_resume(fs_info
);
3191 if (!fs_info
->uuid_root
) {
3192 btrfs_info(fs_info
, "creating UUID tree");
3193 ret
= btrfs_create_uuid_tree(fs_info
);
3196 "failed to create the UUID tree: %d", ret
);
3197 close_ctree(fs_info
);
3200 } else if (btrfs_test_opt(fs_info
, RESCAN_UUID_TREE
) ||
3201 fs_info
->generation
!=
3202 btrfs_super_uuid_tree_generation(disk_super
)) {
3203 btrfs_info(fs_info
, "checking UUID tree");
3204 ret
= btrfs_check_uuid_tree(fs_info
);
3207 "failed to check the UUID tree: %d", ret
);
3208 close_ctree(fs_info
);
3212 set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN
, &fs_info
->flags
);
3214 set_bit(BTRFS_FS_OPEN
, &fs_info
->flags
);
3217 * backuproot only affect mount behavior, and if open_ctree succeeded,
3218 * no need to keep the flag
3220 btrfs_clear_opt(fs_info
->mount_opt
, USEBACKUPROOT
);
3225 btrfs_free_qgroup_config(fs_info
);
3227 kthread_stop(fs_info
->transaction_kthread
);
3228 btrfs_cleanup_transaction(fs_info
);
3229 btrfs_free_fs_roots(fs_info
);
3231 kthread_stop(fs_info
->cleaner_kthread
);
3234 * make sure we're done with the btree inode before we stop our
3237 filemap_write_and_wait(fs_info
->btree_inode
->i_mapping
);
3240 btrfs_sysfs_remove_mounted(fs_info
);
3243 btrfs_sysfs_remove_fsid(fs_info
->fs_devices
);
3246 btrfs_put_block_group_cache(fs_info
);
3249 free_root_pointers(fs_info
, 1);
3250 invalidate_inode_pages2(fs_info
->btree_inode
->i_mapping
);
3253 btrfs_stop_all_workers(fs_info
);
3254 btrfs_free_block_groups(fs_info
);
3257 btrfs_mapping_tree_free(&fs_info
->mapping_tree
);
3259 iput(fs_info
->btree_inode
);
3261 percpu_counter_destroy(&fs_info
->bio_counter
);
3262 fail_delalloc_bytes
:
3263 percpu_counter_destroy(&fs_info
->delalloc_bytes
);
3264 fail_dirty_metadata_bytes
:
3265 percpu_counter_destroy(&fs_info
->dirty_metadata_bytes
);
3267 cleanup_srcu_struct(&fs_info
->subvol_srcu
);
3269 btrfs_free_stripe_hash_table(fs_info
);
3270 btrfs_close_devices(fs_info
->fs_devices
);
3274 if (!btrfs_test_opt(fs_info
, USEBACKUPROOT
))
3275 goto fail_tree_roots
;
3277 free_root_pointers(fs_info
, 0);
3279 /* don't use the log in recovery mode, it won't be valid */
3280 btrfs_set_super_log_root(disk_super
, 0);
3282 /* we can't trust the free space cache either */
3283 btrfs_set_opt(fs_info
->mount_opt
, CLEAR_CACHE
);
3285 ret
= next_root_backup(fs_info
, fs_info
->super_copy
,
3286 &num_backups_tried
, &backup_index
);
3288 goto fail_block_groups
;
3289 goto retry_root_backup
;
3292 static void btrfs_end_buffer_write_sync(struct buffer_head
*bh
, int uptodate
)
3295 set_buffer_uptodate(bh
);
3297 struct btrfs_device
*device
= (struct btrfs_device
*)
3300 btrfs_warn_rl_in_rcu(device
->fs_info
,
3301 "lost page write due to IO error on %s",
3302 rcu_str_deref(device
->name
));
3303 /* note, we don't set_buffer_write_io_error because we have
3304 * our own ways of dealing with the IO errors
3306 clear_buffer_uptodate(bh
);
3307 btrfs_dev_stat_inc_and_print(device
, BTRFS_DEV_STAT_WRITE_ERRS
);
3313 int btrfs_read_dev_one_super(struct block_device
*bdev
, int copy_num
,
3314 struct buffer_head
**bh_ret
)
3316 struct buffer_head
*bh
;
3317 struct btrfs_super_block
*super
;
3320 bytenr
= btrfs_sb_offset(copy_num
);
3321 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
>= i_size_read(bdev
->bd_inode
))
3324 bh
= __bread(bdev
, bytenr
/ 4096, BTRFS_SUPER_INFO_SIZE
);
3326 * If we fail to read from the underlying devices, as of now
3327 * the best option we have is to mark it EIO.
3332 super
= (struct btrfs_super_block
*)bh
->b_data
;
3333 if (btrfs_super_bytenr(super
) != bytenr
||
3334 btrfs_super_magic(super
) != BTRFS_MAGIC
) {
3344 struct buffer_head
*btrfs_read_dev_super(struct block_device
*bdev
)
3346 struct buffer_head
*bh
;
3347 struct buffer_head
*latest
= NULL
;
3348 struct btrfs_super_block
*super
;
3353 /* we would like to check all the supers, but that would make
3354 * a btrfs mount succeed after a mkfs from a different FS.
3355 * So, we need to add a special mount option to scan for
3356 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
3358 for (i
= 0; i
< 1; i
++) {
3359 ret
= btrfs_read_dev_one_super(bdev
, i
, &bh
);
3363 super
= (struct btrfs_super_block
*)bh
->b_data
;
3365 if (!latest
|| btrfs_super_generation(super
) > transid
) {
3368 transid
= btrfs_super_generation(super
);
3375 return ERR_PTR(ret
);
3381 * this should be called twice, once with wait == 0 and
3382 * once with wait == 1. When wait == 0 is done, all the buffer heads
3383 * we write are pinned.
3385 * They are released when wait == 1 is done.
3386 * max_mirrors must be the same for both runs, and it indicates how
3387 * many supers on this one device should be written.
3389 * max_mirrors == 0 means to write them all.
3391 static int write_dev_supers(struct btrfs_device
*device
,
3392 struct btrfs_super_block
*sb
,
3393 int wait
, int max_mirrors
)
3395 struct buffer_head
*bh
;
3402 if (max_mirrors
== 0)
3403 max_mirrors
= BTRFS_SUPER_MIRROR_MAX
;
3405 for (i
= 0; i
< max_mirrors
; i
++) {
3406 bytenr
= btrfs_sb_offset(i
);
3407 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
>=
3408 device
->commit_total_bytes
)
3412 bh
= __find_get_block(device
->bdev
, bytenr
/ 4096,
3413 BTRFS_SUPER_INFO_SIZE
);
3419 if (!buffer_uptodate(bh
))
3422 /* drop our reference */
3425 /* drop the reference from the wait == 0 run */
3429 btrfs_set_super_bytenr(sb
, bytenr
);
3432 crc
= btrfs_csum_data((const char *)sb
+
3433 BTRFS_CSUM_SIZE
, crc
,
3434 BTRFS_SUPER_INFO_SIZE
-
3436 btrfs_csum_final(crc
, sb
->csum
);
3439 * one reference for us, and we leave it for the
3442 bh
= __getblk(device
->bdev
, bytenr
/ 4096,
3443 BTRFS_SUPER_INFO_SIZE
);
3445 btrfs_err(device
->fs_info
,
3446 "couldn't get super buffer head for bytenr %llu",
3452 memcpy(bh
->b_data
, sb
, BTRFS_SUPER_INFO_SIZE
);
3454 /* one reference for submit_bh */
3457 set_buffer_uptodate(bh
);
3459 bh
->b_end_io
= btrfs_end_buffer_write_sync
;
3460 bh
->b_private
= device
;
3464 * we fua the first super. The others we allow
3468 ret
= btrfsic_submit_bh(REQ_OP_WRITE
,
3469 REQ_SYNC
| REQ_FUA
, bh
);
3471 ret
= btrfsic_submit_bh(REQ_OP_WRITE
, REQ_SYNC
, bh
);
3476 return errors
< i
? 0 : -1;
3480 * endio for the write_dev_flush, this will wake anyone waiting
3481 * for the barrier when it is done
3483 static void btrfs_end_empty_barrier(struct bio
*bio
)
3485 complete(bio
->bi_private
);
3489 * Submit a flush request to the device if it supports it. Error handling is
3490 * done in the waiting counterpart.
3492 static void write_dev_flush(struct btrfs_device
*device
)
3494 struct request_queue
*q
= bdev_get_queue(device
->bdev
);
3495 struct bio
*bio
= device
->flush_bio
;
3497 if (!test_bit(QUEUE_FLAG_WC
, &q
->queue_flags
))
3501 bio
->bi_end_io
= btrfs_end_empty_barrier
;
3502 bio
->bi_bdev
= device
->bdev
;
3503 bio
->bi_opf
= REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
;
3504 init_completion(&device
->flush_wait
);
3505 bio
->bi_private
= &device
->flush_wait
;
3508 device
->flush_bio_sent
= 1;
3512 * If the flush bio has been submitted by write_dev_flush, wait for it.
3514 static blk_status_t
wait_dev_flush(struct btrfs_device
*device
)
3516 struct bio
*bio
= device
->flush_bio
;
3518 if (!device
->flush_bio_sent
)
3521 device
->flush_bio_sent
= 0;
3522 wait_for_completion_io(&device
->flush_wait
);
3524 return bio
->bi_status
;
3527 static int check_barrier_error(struct btrfs_fs_devices
*fsdevs
)
3529 int dev_flush_error
= 0;
3530 struct btrfs_device
*dev
;
3532 list_for_each_entry_rcu(dev
, &fsdevs
->devices
, dev_list
) {
3533 if (!dev
->bdev
|| dev
->last_flush_error
)
3537 if (dev_flush_error
>
3538 fsdevs
->fs_info
->num_tolerated_disk_barrier_failures
)
3545 * send an empty flush down to each device in parallel,
3546 * then wait for them
3548 static int barrier_all_devices(struct btrfs_fs_info
*info
)
3550 struct list_head
*head
;
3551 struct btrfs_device
*dev
;
3552 int errors_wait
= 0;
3555 /* send down all the barriers */
3556 head
= &info
->fs_devices
->devices
;
3557 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3562 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3565 write_dev_flush(dev
);
3566 dev
->last_flush_error
= 0;
3569 /* wait for all the barriers */
3570 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3577 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3580 ret
= wait_dev_flush(dev
);
3582 dev
->last_flush_error
= ret
;
3583 btrfs_dev_stat_inc_and_print(dev
,
3584 BTRFS_DEV_STAT_FLUSH_ERRS
);
3591 * At some point we need the status of all disks
3592 * to arrive at the volume status. So error checking
3593 * is being pushed to a separate loop.
3595 return check_barrier_error(info
->fs_devices
);
3600 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags
)
3603 int min_tolerated
= INT_MAX
;
3605 if ((flags
& BTRFS_BLOCK_GROUP_PROFILE_MASK
) == 0 ||
3606 (flags
& BTRFS_AVAIL_ALLOC_BIT_SINGLE
))
3607 min_tolerated
= min(min_tolerated
,
3608 btrfs_raid_array
[BTRFS_RAID_SINGLE
].
3609 tolerated_failures
);
3611 for (raid_type
= 0; raid_type
< BTRFS_NR_RAID_TYPES
; raid_type
++) {
3612 if (raid_type
== BTRFS_RAID_SINGLE
)
3614 if (!(flags
& btrfs_raid_group
[raid_type
]))
3616 min_tolerated
= min(min_tolerated
,
3617 btrfs_raid_array
[raid_type
].
3618 tolerated_failures
);
3621 if (min_tolerated
== INT_MAX
) {
3622 pr_warn("BTRFS: unknown raid flag: %llu", flags
);
3626 return min_tolerated
;
3629 int btrfs_calc_num_tolerated_disk_barrier_failures(
3630 struct btrfs_fs_info
*fs_info
)
3632 struct btrfs_ioctl_space_info space
;
3633 struct btrfs_space_info
*sinfo
;
3634 u64 types
[] = {BTRFS_BLOCK_GROUP_DATA
,
3635 BTRFS_BLOCK_GROUP_SYSTEM
,
3636 BTRFS_BLOCK_GROUP_METADATA
,
3637 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
};
3640 int num_tolerated_disk_barrier_failures
=
3641 (int)fs_info
->fs_devices
->num_devices
;
3643 for (i
= 0; i
< ARRAY_SIZE(types
); i
++) {
3644 struct btrfs_space_info
*tmp
;
3648 list_for_each_entry_rcu(tmp
, &fs_info
->space_info
, list
) {
3649 if (tmp
->flags
== types
[i
]) {
3659 down_read(&sinfo
->groups_sem
);
3660 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3663 if (list_empty(&sinfo
->block_groups
[c
]))
3666 btrfs_get_block_group_info(&sinfo
->block_groups
[c
],
3668 if (space
.total_bytes
== 0 || space
.used_bytes
== 0)
3670 flags
= space
.flags
;
3672 num_tolerated_disk_barrier_failures
= min(
3673 num_tolerated_disk_barrier_failures
,
3674 btrfs_get_num_tolerated_disk_barrier_failures(
3677 up_read(&sinfo
->groups_sem
);
3680 return num_tolerated_disk_barrier_failures
;
3683 int write_all_supers(struct btrfs_fs_info
*fs_info
, int max_mirrors
)
3685 struct list_head
*head
;
3686 struct btrfs_device
*dev
;
3687 struct btrfs_super_block
*sb
;
3688 struct btrfs_dev_item
*dev_item
;
3692 int total_errors
= 0;
3695 do_barriers
= !btrfs_test_opt(fs_info
, NOBARRIER
);
3696 backup_super_roots(fs_info
);
3698 sb
= fs_info
->super_for_commit
;
3699 dev_item
= &sb
->dev_item
;
3701 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
3702 head
= &fs_info
->fs_devices
->devices
;
3703 max_errors
= btrfs_super_num_devices(fs_info
->super_copy
) - 1;
3706 ret
= barrier_all_devices(fs_info
);
3709 &fs_info
->fs_devices
->device_list_mutex
);
3710 btrfs_handle_fs_error(fs_info
, ret
,
3711 "errors while submitting device barriers.");
3716 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3721 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3724 btrfs_set_stack_device_generation(dev_item
, 0);
3725 btrfs_set_stack_device_type(dev_item
, dev
->type
);
3726 btrfs_set_stack_device_id(dev_item
, dev
->devid
);
3727 btrfs_set_stack_device_total_bytes(dev_item
,
3728 dev
->commit_total_bytes
);
3729 btrfs_set_stack_device_bytes_used(dev_item
,
3730 dev
->commit_bytes_used
);
3731 btrfs_set_stack_device_io_align(dev_item
, dev
->io_align
);
3732 btrfs_set_stack_device_io_width(dev_item
, dev
->io_width
);
3733 btrfs_set_stack_device_sector_size(dev_item
, dev
->sector_size
);
3734 memcpy(dev_item
->uuid
, dev
->uuid
, BTRFS_UUID_SIZE
);
3735 memcpy(dev_item
->fsid
, dev
->fs_devices
->fsid
, BTRFS_UUID_SIZE
);
3737 flags
= btrfs_super_flags(sb
);
3738 btrfs_set_super_flags(sb
, flags
| BTRFS_HEADER_FLAG_WRITTEN
);
3740 ret
= write_dev_supers(dev
, sb
, 0, max_mirrors
);
3744 if (total_errors
> max_errors
) {
3745 btrfs_err(fs_info
, "%d errors while writing supers",
3747 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
3749 /* FUA is masked off if unsupported and can't be the reason */
3750 btrfs_handle_fs_error(fs_info
, -EIO
,
3751 "%d errors while writing supers",
3757 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3760 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3763 ret
= write_dev_supers(dev
, sb
, 1, max_mirrors
);
3767 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
3768 if (total_errors
> max_errors
) {
3769 btrfs_handle_fs_error(fs_info
, -EIO
,
3770 "%d errors while writing supers",
3777 /* Drop a fs root from the radix tree and free it. */
3778 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info
*fs_info
,
3779 struct btrfs_root
*root
)
3781 spin_lock(&fs_info
->fs_roots_radix_lock
);
3782 radix_tree_delete(&fs_info
->fs_roots_radix
,
3783 (unsigned long)root
->root_key
.objectid
);
3784 spin_unlock(&fs_info
->fs_roots_radix_lock
);
3786 if (btrfs_root_refs(&root
->root_item
) == 0)
3787 synchronize_srcu(&fs_info
->subvol_srcu
);
3789 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
)) {
3790 btrfs_free_log(NULL
, root
);
3791 if (root
->reloc_root
) {
3792 free_extent_buffer(root
->reloc_root
->node
);
3793 free_extent_buffer(root
->reloc_root
->commit_root
);
3794 btrfs_put_fs_root(root
->reloc_root
);
3795 root
->reloc_root
= NULL
;
3799 if (root
->free_ino_pinned
)
3800 __btrfs_remove_free_space_cache(root
->free_ino_pinned
);
3801 if (root
->free_ino_ctl
)
3802 __btrfs_remove_free_space_cache(root
->free_ino_ctl
);
3806 static void free_fs_root(struct btrfs_root
*root
)
3808 iput(root
->ino_cache_inode
);
3809 WARN_ON(!RB_EMPTY_ROOT(&root
->inode_tree
));
3810 btrfs_free_block_rsv(root
->fs_info
, root
->orphan_block_rsv
);
3811 root
->orphan_block_rsv
= NULL
;
3813 free_anon_bdev(root
->anon_dev
);
3814 if (root
->subv_writers
)
3815 btrfs_free_subvolume_writers(root
->subv_writers
);
3816 free_extent_buffer(root
->node
);
3817 free_extent_buffer(root
->commit_root
);
3818 kfree(root
->free_ino_ctl
);
3819 kfree(root
->free_ino_pinned
);
3821 btrfs_put_fs_root(root
);
3824 void btrfs_free_fs_root(struct btrfs_root
*root
)
3829 int btrfs_cleanup_fs_roots(struct btrfs_fs_info
*fs_info
)
3831 u64 root_objectid
= 0;
3832 struct btrfs_root
*gang
[8];
3835 unsigned int ret
= 0;
3839 index
= srcu_read_lock(&fs_info
->subvol_srcu
);
3840 ret
= radix_tree_gang_lookup(&fs_info
->fs_roots_radix
,
3841 (void **)gang
, root_objectid
,
3844 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
3847 root_objectid
= gang
[ret
- 1]->root_key
.objectid
+ 1;
3849 for (i
= 0; i
< ret
; i
++) {
3850 /* Avoid to grab roots in dead_roots */
3851 if (btrfs_root_refs(&gang
[i
]->root_item
) == 0) {
3855 /* grab all the search result for later use */
3856 gang
[i
] = btrfs_grab_fs_root(gang
[i
]);
3858 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
3860 for (i
= 0; i
< ret
; i
++) {
3863 root_objectid
= gang
[i
]->root_key
.objectid
;
3864 err
= btrfs_orphan_cleanup(gang
[i
]);
3867 btrfs_put_fs_root(gang
[i
]);
3872 /* release the uncleaned roots due to error */
3873 for (; i
< ret
; i
++) {
3875 btrfs_put_fs_root(gang
[i
]);
3880 int btrfs_commit_super(struct btrfs_fs_info
*fs_info
)
3882 struct btrfs_root
*root
= fs_info
->tree_root
;
3883 struct btrfs_trans_handle
*trans
;
3885 mutex_lock(&fs_info
->cleaner_mutex
);
3886 btrfs_run_delayed_iputs(fs_info
);
3887 mutex_unlock(&fs_info
->cleaner_mutex
);
3888 wake_up_process(fs_info
->cleaner_kthread
);
3890 /* wait until ongoing cleanup work done */
3891 down_write(&fs_info
->cleanup_work_sem
);
3892 up_write(&fs_info
->cleanup_work_sem
);
3894 trans
= btrfs_join_transaction(root
);
3896 return PTR_ERR(trans
);
3897 return btrfs_commit_transaction(trans
);
3900 void close_ctree(struct btrfs_fs_info
*fs_info
)
3902 struct btrfs_root
*root
= fs_info
->tree_root
;
3905 set_bit(BTRFS_FS_CLOSING_START
, &fs_info
->flags
);
3907 /* wait for the qgroup rescan worker to stop */
3908 btrfs_qgroup_wait_for_completion(fs_info
, false);
3910 /* wait for the uuid_scan task to finish */
3911 down(&fs_info
->uuid_tree_rescan_sem
);
3912 /* avoid complains from lockdep et al., set sem back to initial state */
3913 up(&fs_info
->uuid_tree_rescan_sem
);
3915 /* pause restriper - we want to resume on mount */
3916 btrfs_pause_balance(fs_info
);
3918 btrfs_dev_replace_suspend_for_unmount(fs_info
);
3920 btrfs_scrub_cancel(fs_info
);
3922 /* wait for any defraggers to finish */
3923 wait_event(fs_info
->transaction_wait
,
3924 (atomic_read(&fs_info
->defrag_running
) == 0));
3926 /* clear out the rbtree of defraggable inodes */
3927 btrfs_cleanup_defrag_inodes(fs_info
);
3929 cancel_work_sync(&fs_info
->async_reclaim_work
);
3931 if (!(fs_info
->sb
->s_flags
& MS_RDONLY
)) {
3933 * If the cleaner thread is stopped and there are
3934 * block groups queued for removal, the deletion will be
3935 * skipped when we quit the cleaner thread.
3937 btrfs_delete_unused_bgs(fs_info
);
3939 ret
= btrfs_commit_super(fs_info
);
3941 btrfs_err(fs_info
, "commit super ret %d", ret
);
3944 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
3945 btrfs_error_commit_super(fs_info
);
3947 kthread_stop(fs_info
->transaction_kthread
);
3948 kthread_stop(fs_info
->cleaner_kthread
);
3950 set_bit(BTRFS_FS_CLOSING_DONE
, &fs_info
->flags
);
3952 btrfs_free_qgroup_config(fs_info
);
3954 if (percpu_counter_sum(&fs_info
->delalloc_bytes
)) {
3955 btrfs_info(fs_info
, "at unmount delalloc count %lld",
3956 percpu_counter_sum(&fs_info
->delalloc_bytes
));
3959 btrfs_sysfs_remove_mounted(fs_info
);
3960 btrfs_sysfs_remove_fsid(fs_info
->fs_devices
);
3962 btrfs_free_fs_roots(fs_info
);
3964 btrfs_put_block_group_cache(fs_info
);
3967 * we must make sure there is not any read request to
3968 * submit after we stopping all workers.
3970 invalidate_inode_pages2(fs_info
->btree_inode
->i_mapping
);
3971 btrfs_stop_all_workers(fs_info
);
3973 btrfs_free_block_groups(fs_info
);
3975 clear_bit(BTRFS_FS_OPEN
, &fs_info
->flags
);
3976 free_root_pointers(fs_info
, 1);
3978 iput(fs_info
->btree_inode
);
3980 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3981 if (btrfs_test_opt(fs_info
, CHECK_INTEGRITY
))
3982 btrfsic_unmount(fs_info
->fs_devices
);
3985 btrfs_close_devices(fs_info
->fs_devices
);
3986 btrfs_mapping_tree_free(&fs_info
->mapping_tree
);
3988 percpu_counter_destroy(&fs_info
->dirty_metadata_bytes
);
3989 percpu_counter_destroy(&fs_info
->delalloc_bytes
);
3990 percpu_counter_destroy(&fs_info
->bio_counter
);
3991 cleanup_srcu_struct(&fs_info
->subvol_srcu
);
3993 btrfs_free_stripe_hash_table(fs_info
);
3995 __btrfs_free_block_rsv(root
->orphan_block_rsv
);
3996 root
->orphan_block_rsv
= NULL
;
3998 mutex_lock(&fs_info
->chunk_mutex
);
3999 while (!list_empty(&fs_info
->pinned_chunks
)) {
4000 struct extent_map
*em
;
4002 em
= list_first_entry(&fs_info
->pinned_chunks
,
4003 struct extent_map
, list
);
4004 list_del_init(&em
->list
);
4005 free_extent_map(em
);
4007 mutex_unlock(&fs_info
->chunk_mutex
);
4010 int btrfs_buffer_uptodate(struct extent_buffer
*buf
, u64 parent_transid
,
4014 struct inode
*btree_inode
= buf
->pages
[0]->mapping
->host
;
4016 ret
= extent_buffer_uptodate(buf
);
4020 ret
= verify_parent_transid(&BTRFS_I(btree_inode
)->io_tree
, buf
,
4021 parent_transid
, atomic
);
4027 void btrfs_mark_buffer_dirty(struct extent_buffer
*buf
)
4029 struct btrfs_fs_info
*fs_info
;
4030 struct btrfs_root
*root
;
4031 u64 transid
= btrfs_header_generation(buf
);
4034 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4036 * This is a fast path so only do this check if we have sanity tests
4037 * enabled. Normal people shouldn't be marking dummy buffers as dirty
4038 * outside of the sanity tests.
4040 if (unlikely(test_bit(EXTENT_BUFFER_DUMMY
, &buf
->bflags
)))
4043 root
= BTRFS_I(buf
->pages
[0]->mapping
->host
)->root
;
4044 fs_info
= root
->fs_info
;
4045 btrfs_assert_tree_locked(buf
);
4046 if (transid
!= fs_info
->generation
)
4047 WARN(1, KERN_CRIT
"btrfs transid mismatch buffer %llu, found %llu running %llu\n",
4048 buf
->start
, transid
, fs_info
->generation
);
4049 was_dirty
= set_extent_buffer_dirty(buf
);
4051 percpu_counter_add_batch(&fs_info
->dirty_metadata_bytes
,
4053 fs_info
->dirty_metadata_batch
);
4054 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4055 if (btrfs_header_level(buf
) == 0 && check_leaf(root
, buf
)) {
4056 btrfs_print_leaf(fs_info
, buf
);
4062 static void __btrfs_btree_balance_dirty(struct btrfs_fs_info
*fs_info
,
4066 * looks as though older kernels can get into trouble with
4067 * this code, they end up stuck in balance_dirty_pages forever
4071 if (current
->flags
& PF_MEMALLOC
)
4075 btrfs_balance_delayed_items(fs_info
);
4077 ret
= percpu_counter_compare(&fs_info
->dirty_metadata_bytes
,
4078 BTRFS_DIRTY_METADATA_THRESH
);
4080 balance_dirty_pages_ratelimited(fs_info
->btree_inode
->i_mapping
);
4084 void btrfs_btree_balance_dirty(struct btrfs_fs_info
*fs_info
)
4086 __btrfs_btree_balance_dirty(fs_info
, 1);
4089 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info
*fs_info
)
4091 __btrfs_btree_balance_dirty(fs_info
, 0);
4094 int btrfs_read_buffer(struct extent_buffer
*buf
, u64 parent_transid
)
4096 struct btrfs_root
*root
= BTRFS_I(buf
->pages
[0]->mapping
->host
)->root
;
4097 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4099 return btree_read_extent_buffer_pages(fs_info
, buf
, parent_transid
);
4102 static int btrfs_check_super_valid(struct btrfs_fs_info
*fs_info
)
4104 struct btrfs_super_block
*sb
= fs_info
->super_copy
;
4105 u64 nodesize
= btrfs_super_nodesize(sb
);
4106 u64 sectorsize
= btrfs_super_sectorsize(sb
);
4109 if (btrfs_super_magic(sb
) != BTRFS_MAGIC
) {
4110 btrfs_err(fs_info
, "no valid FS found");
4113 if (btrfs_super_flags(sb
) & ~BTRFS_SUPER_FLAG_SUPP
)
4114 btrfs_warn(fs_info
, "unrecognized super flag: %llu",
4115 btrfs_super_flags(sb
) & ~BTRFS_SUPER_FLAG_SUPP
);
4116 if (btrfs_super_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
4117 btrfs_err(fs_info
, "tree_root level too big: %d >= %d",
4118 btrfs_super_root_level(sb
), BTRFS_MAX_LEVEL
);
4121 if (btrfs_super_chunk_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
4122 btrfs_err(fs_info
, "chunk_root level too big: %d >= %d",
4123 btrfs_super_chunk_root_level(sb
), BTRFS_MAX_LEVEL
);
4126 if (btrfs_super_log_root_level(sb
) >= BTRFS_MAX_LEVEL
) {
4127 btrfs_err(fs_info
, "log_root level too big: %d >= %d",
4128 btrfs_super_log_root_level(sb
), BTRFS_MAX_LEVEL
);
4133 * Check sectorsize and nodesize first, other check will need it.
4134 * Check all possible sectorsize(4K, 8K, 16K, 32K, 64K) here.
4136 if (!is_power_of_2(sectorsize
) || sectorsize
< 4096 ||
4137 sectorsize
> BTRFS_MAX_METADATA_BLOCKSIZE
) {
4138 btrfs_err(fs_info
, "invalid sectorsize %llu", sectorsize
);
4141 /* Only PAGE SIZE is supported yet */
4142 if (sectorsize
!= PAGE_SIZE
) {
4144 "sectorsize %llu not supported yet, only support %lu",
4145 sectorsize
, PAGE_SIZE
);
4148 if (!is_power_of_2(nodesize
) || nodesize
< sectorsize
||
4149 nodesize
> BTRFS_MAX_METADATA_BLOCKSIZE
) {
4150 btrfs_err(fs_info
, "invalid nodesize %llu", nodesize
);
4153 if (nodesize
!= le32_to_cpu(sb
->__unused_leafsize
)) {
4154 btrfs_err(fs_info
, "invalid leafsize %u, should be %llu",
4155 le32_to_cpu(sb
->__unused_leafsize
), nodesize
);
4159 /* Root alignment check */
4160 if (!IS_ALIGNED(btrfs_super_root(sb
), sectorsize
)) {
4161 btrfs_warn(fs_info
, "tree_root block unaligned: %llu",
4162 btrfs_super_root(sb
));
4165 if (!IS_ALIGNED(btrfs_super_chunk_root(sb
), sectorsize
)) {
4166 btrfs_warn(fs_info
, "chunk_root block unaligned: %llu",
4167 btrfs_super_chunk_root(sb
));
4170 if (!IS_ALIGNED(btrfs_super_log_root(sb
), sectorsize
)) {
4171 btrfs_warn(fs_info
, "log_root block unaligned: %llu",
4172 btrfs_super_log_root(sb
));
4176 if (memcmp(fs_info
->fsid
, sb
->dev_item
.fsid
, BTRFS_UUID_SIZE
) != 0) {
4178 "dev_item UUID does not match fsid: %pU != %pU",
4179 fs_info
->fsid
, sb
->dev_item
.fsid
);
4184 * Hint to catch really bogus numbers, bitflips or so, more exact checks are
4187 if (btrfs_super_bytes_used(sb
) < 6 * btrfs_super_nodesize(sb
)) {
4188 btrfs_err(fs_info
, "bytes_used is too small %llu",
4189 btrfs_super_bytes_used(sb
));
4192 if (!is_power_of_2(btrfs_super_stripesize(sb
))) {
4193 btrfs_err(fs_info
, "invalid stripesize %u",
4194 btrfs_super_stripesize(sb
));
4197 if (btrfs_super_num_devices(sb
) > (1UL << 31))
4198 btrfs_warn(fs_info
, "suspicious number of devices: %llu",
4199 btrfs_super_num_devices(sb
));
4200 if (btrfs_super_num_devices(sb
) == 0) {
4201 btrfs_err(fs_info
, "number of devices is 0");
4205 if (btrfs_super_bytenr(sb
) != BTRFS_SUPER_INFO_OFFSET
) {
4206 btrfs_err(fs_info
, "super offset mismatch %llu != %u",
4207 btrfs_super_bytenr(sb
), BTRFS_SUPER_INFO_OFFSET
);
4212 * Obvious sys_chunk_array corruptions, it must hold at least one key
4215 if (btrfs_super_sys_array_size(sb
) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
) {
4216 btrfs_err(fs_info
, "system chunk array too big %u > %u",
4217 btrfs_super_sys_array_size(sb
),
4218 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE
);
4221 if (btrfs_super_sys_array_size(sb
) < sizeof(struct btrfs_disk_key
)
4222 + sizeof(struct btrfs_chunk
)) {
4223 btrfs_err(fs_info
, "system chunk array too small %u < %zu",
4224 btrfs_super_sys_array_size(sb
),
4225 sizeof(struct btrfs_disk_key
)
4226 + sizeof(struct btrfs_chunk
));
4231 * The generation is a global counter, we'll trust it more than the others
4232 * but it's still possible that it's the one that's wrong.
4234 if (btrfs_super_generation(sb
) < btrfs_super_chunk_root_generation(sb
))
4236 "suspicious: generation < chunk_root_generation: %llu < %llu",
4237 btrfs_super_generation(sb
),
4238 btrfs_super_chunk_root_generation(sb
));
4239 if (btrfs_super_generation(sb
) < btrfs_super_cache_generation(sb
)
4240 && btrfs_super_cache_generation(sb
) != (u64
)-1)
4242 "suspicious: generation < cache_generation: %llu < %llu",
4243 btrfs_super_generation(sb
),
4244 btrfs_super_cache_generation(sb
));
4249 static void btrfs_error_commit_super(struct btrfs_fs_info
*fs_info
)
4251 mutex_lock(&fs_info
->cleaner_mutex
);
4252 btrfs_run_delayed_iputs(fs_info
);
4253 mutex_unlock(&fs_info
->cleaner_mutex
);
4255 down_write(&fs_info
->cleanup_work_sem
);
4256 up_write(&fs_info
->cleanup_work_sem
);
4258 /* cleanup FS via transaction */
4259 btrfs_cleanup_transaction(fs_info
);
4262 static void btrfs_destroy_ordered_extents(struct btrfs_root
*root
)
4264 struct btrfs_ordered_extent
*ordered
;
4266 spin_lock(&root
->ordered_extent_lock
);
4268 * This will just short circuit the ordered completion stuff which will
4269 * make sure the ordered extent gets properly cleaned up.
4271 list_for_each_entry(ordered
, &root
->ordered_extents
,
4273 set_bit(BTRFS_ORDERED_IOERR
, &ordered
->flags
);
4274 spin_unlock(&root
->ordered_extent_lock
);
4277 static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info
*fs_info
)
4279 struct btrfs_root
*root
;
4280 struct list_head splice
;
4282 INIT_LIST_HEAD(&splice
);
4284 spin_lock(&fs_info
->ordered_root_lock
);
4285 list_splice_init(&fs_info
->ordered_roots
, &splice
);
4286 while (!list_empty(&splice
)) {
4287 root
= list_first_entry(&splice
, struct btrfs_root
,
4289 list_move_tail(&root
->ordered_root
,
4290 &fs_info
->ordered_roots
);
4292 spin_unlock(&fs_info
->ordered_root_lock
);
4293 btrfs_destroy_ordered_extents(root
);
4296 spin_lock(&fs_info
->ordered_root_lock
);
4298 spin_unlock(&fs_info
->ordered_root_lock
);
4301 static int btrfs_destroy_delayed_refs(struct btrfs_transaction
*trans
,
4302 struct btrfs_fs_info
*fs_info
)
4304 struct rb_node
*node
;
4305 struct btrfs_delayed_ref_root
*delayed_refs
;
4306 struct btrfs_delayed_ref_node
*ref
;
4309 delayed_refs
= &trans
->delayed_refs
;
4311 spin_lock(&delayed_refs
->lock
);
4312 if (atomic_read(&delayed_refs
->num_entries
) == 0) {
4313 spin_unlock(&delayed_refs
->lock
);
4314 btrfs_info(fs_info
, "delayed_refs has NO entry");
4318 while ((node
= rb_first(&delayed_refs
->href_root
)) != NULL
) {
4319 struct btrfs_delayed_ref_head
*head
;
4320 struct btrfs_delayed_ref_node
*tmp
;
4321 bool pin_bytes
= false;
4323 head
= rb_entry(node
, struct btrfs_delayed_ref_head
,
4325 if (!mutex_trylock(&head
->mutex
)) {
4326 refcount_inc(&head
->node
.refs
);
4327 spin_unlock(&delayed_refs
->lock
);
4329 mutex_lock(&head
->mutex
);
4330 mutex_unlock(&head
->mutex
);
4331 btrfs_put_delayed_ref(&head
->node
);
4332 spin_lock(&delayed_refs
->lock
);
4335 spin_lock(&head
->lock
);
4336 list_for_each_entry_safe_reverse(ref
, tmp
, &head
->ref_list
,
4339 list_del(&ref
->list
);
4340 if (!list_empty(&ref
->add_list
))
4341 list_del(&ref
->add_list
);
4342 atomic_dec(&delayed_refs
->num_entries
);
4343 btrfs_put_delayed_ref(ref
);
4345 if (head
->must_insert_reserved
)
4347 btrfs_free_delayed_extent_op(head
->extent_op
);
4348 delayed_refs
->num_heads
--;
4349 if (head
->processing
== 0)
4350 delayed_refs
->num_heads_ready
--;
4351 atomic_dec(&delayed_refs
->num_entries
);
4352 head
->node
.in_tree
= 0;
4353 rb_erase(&head
->href_node
, &delayed_refs
->href_root
);
4354 spin_unlock(&head
->lock
);
4355 spin_unlock(&delayed_refs
->lock
);
4356 mutex_unlock(&head
->mutex
);
4359 btrfs_pin_extent(fs_info
, head
->node
.bytenr
,
4360 head
->node
.num_bytes
, 1);
4361 btrfs_put_delayed_ref(&head
->node
);
4363 spin_lock(&delayed_refs
->lock
);
4366 spin_unlock(&delayed_refs
->lock
);
4371 static void btrfs_destroy_delalloc_inodes(struct btrfs_root
*root
)
4373 struct btrfs_inode
*btrfs_inode
;
4374 struct list_head splice
;
4376 INIT_LIST_HEAD(&splice
);
4378 spin_lock(&root
->delalloc_lock
);
4379 list_splice_init(&root
->delalloc_inodes
, &splice
);
4381 while (!list_empty(&splice
)) {
4382 btrfs_inode
= list_first_entry(&splice
, struct btrfs_inode
,
4385 list_del_init(&btrfs_inode
->delalloc_inodes
);
4386 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
4387 &btrfs_inode
->runtime_flags
);
4388 spin_unlock(&root
->delalloc_lock
);
4390 btrfs_invalidate_inodes(btrfs_inode
->root
);
4392 spin_lock(&root
->delalloc_lock
);
4395 spin_unlock(&root
->delalloc_lock
);
4398 static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info
*fs_info
)
4400 struct btrfs_root
*root
;
4401 struct list_head splice
;
4403 INIT_LIST_HEAD(&splice
);
4405 spin_lock(&fs_info
->delalloc_root_lock
);
4406 list_splice_init(&fs_info
->delalloc_roots
, &splice
);
4407 while (!list_empty(&splice
)) {
4408 root
= list_first_entry(&splice
, struct btrfs_root
,
4410 list_del_init(&root
->delalloc_root
);
4411 root
= btrfs_grab_fs_root(root
);
4413 spin_unlock(&fs_info
->delalloc_root_lock
);
4415 btrfs_destroy_delalloc_inodes(root
);
4416 btrfs_put_fs_root(root
);
4418 spin_lock(&fs_info
->delalloc_root_lock
);
4420 spin_unlock(&fs_info
->delalloc_root_lock
);
4423 static int btrfs_destroy_marked_extents(struct btrfs_fs_info
*fs_info
,
4424 struct extent_io_tree
*dirty_pages
,
4428 struct extent_buffer
*eb
;
4433 ret
= find_first_extent_bit(dirty_pages
, start
, &start
, &end
,
4438 clear_extent_bits(dirty_pages
, start
, end
, mark
);
4439 while (start
<= end
) {
4440 eb
= find_extent_buffer(fs_info
, start
);
4441 start
+= fs_info
->nodesize
;
4444 wait_on_extent_buffer_writeback(eb
);
4446 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY
,
4448 clear_extent_buffer_dirty(eb
);
4449 free_extent_buffer_stale(eb
);
4456 static int btrfs_destroy_pinned_extent(struct btrfs_fs_info
*fs_info
,
4457 struct extent_io_tree
*pinned_extents
)
4459 struct extent_io_tree
*unpin
;
4465 unpin
= pinned_extents
;
4468 ret
= find_first_extent_bit(unpin
, 0, &start
, &end
,
4469 EXTENT_DIRTY
, NULL
);
4473 clear_extent_dirty(unpin
, start
, end
);
4474 btrfs_error_unpin_extent_range(fs_info
, start
, end
);
4479 if (unpin
== &fs_info
->freed_extents
[0])
4480 unpin
= &fs_info
->freed_extents
[1];
4482 unpin
= &fs_info
->freed_extents
[0];
4490 static void btrfs_cleanup_bg_io(struct btrfs_block_group_cache
*cache
)
4492 struct inode
*inode
;
4494 inode
= cache
->io_ctl
.inode
;
4496 invalidate_inode_pages2(inode
->i_mapping
);
4497 BTRFS_I(inode
)->generation
= 0;
4498 cache
->io_ctl
.inode
= NULL
;
4501 btrfs_put_block_group(cache
);
4504 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction
*cur_trans
,
4505 struct btrfs_fs_info
*fs_info
)
4507 struct btrfs_block_group_cache
*cache
;
4509 spin_lock(&cur_trans
->dirty_bgs_lock
);
4510 while (!list_empty(&cur_trans
->dirty_bgs
)) {
4511 cache
= list_first_entry(&cur_trans
->dirty_bgs
,
4512 struct btrfs_block_group_cache
,
4515 btrfs_err(fs_info
, "orphan block group dirty_bgs list");
4516 spin_unlock(&cur_trans
->dirty_bgs_lock
);
4520 if (!list_empty(&cache
->io_list
)) {
4521 spin_unlock(&cur_trans
->dirty_bgs_lock
);
4522 list_del_init(&cache
->io_list
);
4523 btrfs_cleanup_bg_io(cache
);
4524 spin_lock(&cur_trans
->dirty_bgs_lock
);
4527 list_del_init(&cache
->dirty_list
);
4528 spin_lock(&cache
->lock
);
4529 cache
->disk_cache_state
= BTRFS_DC_ERROR
;
4530 spin_unlock(&cache
->lock
);
4532 spin_unlock(&cur_trans
->dirty_bgs_lock
);
4533 btrfs_put_block_group(cache
);
4534 spin_lock(&cur_trans
->dirty_bgs_lock
);
4536 spin_unlock(&cur_trans
->dirty_bgs_lock
);
4538 while (!list_empty(&cur_trans
->io_bgs
)) {
4539 cache
= list_first_entry(&cur_trans
->io_bgs
,
4540 struct btrfs_block_group_cache
,
4543 btrfs_err(fs_info
, "orphan block group on io_bgs list");
4547 list_del_init(&cache
->io_list
);
4548 spin_lock(&cache
->lock
);
4549 cache
->disk_cache_state
= BTRFS_DC_ERROR
;
4550 spin_unlock(&cache
->lock
);
4551 btrfs_cleanup_bg_io(cache
);
4555 void btrfs_cleanup_one_transaction(struct btrfs_transaction
*cur_trans
,
4556 struct btrfs_fs_info
*fs_info
)
4558 btrfs_cleanup_dirty_bgs(cur_trans
, fs_info
);
4559 ASSERT(list_empty(&cur_trans
->dirty_bgs
));
4560 ASSERT(list_empty(&cur_trans
->io_bgs
));
4562 btrfs_destroy_delayed_refs(cur_trans
, fs_info
);
4564 cur_trans
->state
= TRANS_STATE_COMMIT_START
;
4565 wake_up(&fs_info
->transaction_blocked_wait
);
4567 cur_trans
->state
= TRANS_STATE_UNBLOCKED
;
4568 wake_up(&fs_info
->transaction_wait
);
4570 btrfs_destroy_delayed_inodes(fs_info
);
4571 btrfs_assert_delayed_root_empty(fs_info
);
4573 btrfs_destroy_marked_extents(fs_info
, &cur_trans
->dirty_pages
,
4575 btrfs_destroy_pinned_extent(fs_info
,
4576 fs_info
->pinned_extents
);
4578 cur_trans
->state
=TRANS_STATE_COMPLETED
;
4579 wake_up(&cur_trans
->commit_wait
);
4582 static int btrfs_cleanup_transaction(struct btrfs_fs_info
*fs_info
)
4584 struct btrfs_transaction
*t
;
4586 mutex_lock(&fs_info
->transaction_kthread_mutex
);
4588 spin_lock(&fs_info
->trans_lock
);
4589 while (!list_empty(&fs_info
->trans_list
)) {
4590 t
= list_first_entry(&fs_info
->trans_list
,
4591 struct btrfs_transaction
, list
);
4592 if (t
->state
>= TRANS_STATE_COMMIT_START
) {
4593 refcount_inc(&t
->use_count
);
4594 spin_unlock(&fs_info
->trans_lock
);
4595 btrfs_wait_for_commit(fs_info
, t
->transid
);
4596 btrfs_put_transaction(t
);
4597 spin_lock(&fs_info
->trans_lock
);
4600 if (t
== fs_info
->running_transaction
) {
4601 t
->state
= TRANS_STATE_COMMIT_DOING
;
4602 spin_unlock(&fs_info
->trans_lock
);
4604 * We wait for 0 num_writers since we don't hold a trans
4605 * handle open currently for this transaction.
4607 wait_event(t
->writer_wait
,
4608 atomic_read(&t
->num_writers
) == 0);
4610 spin_unlock(&fs_info
->trans_lock
);
4612 btrfs_cleanup_one_transaction(t
, fs_info
);
4614 spin_lock(&fs_info
->trans_lock
);
4615 if (t
== fs_info
->running_transaction
)
4616 fs_info
->running_transaction
= NULL
;
4617 list_del_init(&t
->list
);
4618 spin_unlock(&fs_info
->trans_lock
);
4620 btrfs_put_transaction(t
);
4621 trace_btrfs_transaction_commit(fs_info
->tree_root
);
4622 spin_lock(&fs_info
->trans_lock
);
4624 spin_unlock(&fs_info
->trans_lock
);
4625 btrfs_destroy_all_ordered_extents(fs_info
);
4626 btrfs_destroy_delayed_inodes(fs_info
);
4627 btrfs_assert_delayed_root_empty(fs_info
);
4628 btrfs_destroy_pinned_extent(fs_info
, fs_info
->pinned_extents
);
4629 btrfs_destroy_all_delalloc_inodes(fs_info
);
4630 mutex_unlock(&fs_info
->transaction_kthread_mutex
);
4635 static struct btrfs_fs_info
*btree_fs_info(void *private_data
)
4637 struct inode
*inode
= private_data
;
4638 return btrfs_sb(inode
->i_sb
);
4641 static const struct extent_io_ops btree_extent_io_ops
= {
4642 /* mandatory callbacks */
4643 .submit_bio_hook
= btree_submit_bio_hook
,
4644 .readpage_end_io_hook
= btree_readpage_end_io_hook
,
4645 /* note we're sharing with inode.c for the merge bio hook */
4646 .merge_bio_hook
= btrfs_merge_bio_hook
,
4647 .readpage_io_failed_hook
= btree_io_failed_hook
,
4648 .set_range_writeback
= btrfs_set_range_writeback
,
4649 .tree_fs_info
= btree_fs_info
,
4651 /* optional callbacks */