2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
20 #include <linux/blkdev.h>
21 #include <linux/scatterlist.h>
22 #include <linux/swap.h>
23 #include <linux/radix-tree.h>
24 #include <linux/writeback.h>
25 #include <linux/buffer_head.h>
26 #include <linux/workqueue.h>
27 #include <linux/kthread.h>
28 #include <linux/freezer.h>
29 #include <linux/slab.h>
30 #include <linux/migrate.h>
31 #include <linux/ratelimit.h>
32 #include <linux/uuid.h>
33 #include <linux/semaphore.h>
34 #include <asm/unaligned.h>
38 #include "transaction.h"
39 #include "btrfs_inode.h"
41 #include "print-tree.h"
42 #include "async-thread.h"
45 #include "free-space-cache.h"
46 #include "inode-map.h"
47 #include "check-integrity.h"
48 #include "rcu-string.h"
49 #include "dev-replace.h"
54 #include <asm/cpufeature.h>
57 static struct extent_io_ops btree_extent_io_ops
;
58 static void end_workqueue_fn(struct btrfs_work
*work
);
59 static void free_fs_root(struct btrfs_root
*root
);
60 static int btrfs_check_super_valid(struct btrfs_fs_info
*fs_info
,
62 static void btrfs_destroy_ordered_operations(struct btrfs_transaction
*t
,
63 struct btrfs_root
*root
);
64 static void btrfs_destroy_ordered_extents(struct btrfs_root
*root
);
65 static int btrfs_destroy_delayed_refs(struct btrfs_transaction
*trans
,
66 struct btrfs_root
*root
);
67 static void btrfs_destroy_delalloc_inodes(struct btrfs_root
*root
);
68 static int btrfs_destroy_marked_extents(struct btrfs_root
*root
,
69 struct extent_io_tree
*dirty_pages
,
71 static int btrfs_destroy_pinned_extent(struct btrfs_root
*root
,
72 struct extent_io_tree
*pinned_extents
);
73 static int btrfs_cleanup_transaction(struct btrfs_root
*root
);
74 static void btrfs_error_commit_super(struct btrfs_root
*root
);
77 * end_io_wq structs are used to do processing in task context when an IO is
78 * complete. This is used during reads to verify checksums, and it is used
79 * by writes to insert metadata for new file extents after IO is complete.
85 struct btrfs_fs_info
*info
;
88 struct list_head list
;
89 struct btrfs_work work
;
93 * async submit bios are used to offload expensive checksumming
94 * onto the worker threads. They checksum file and metadata bios
95 * just before they are sent down the IO stack.
97 struct async_submit_bio
{
100 struct list_head list
;
101 extent_submit_bio_hook_t
*submit_bio_start
;
102 extent_submit_bio_hook_t
*submit_bio_done
;
105 unsigned long bio_flags
;
107 * bio_offset is optional, can be used if the pages in the bio
108 * can't tell us where in the file the bio should go
111 struct btrfs_work_struct work
;
116 * Lockdep class keys for extent_buffer->lock's in this root. For a given
117 * eb, the lockdep key is determined by the btrfs_root it belongs to and
118 * the level the eb occupies in the tree.
120 * Different roots are used for different purposes and may nest inside each
121 * other and they require separate keysets. As lockdep keys should be
122 * static, assign keysets according to the purpose of the root as indicated
123 * by btrfs_root->objectid. This ensures that all special purpose roots
124 * have separate keysets.
126 * Lock-nesting across peer nodes is always done with the immediate parent
127 * node locked thus preventing deadlock. As lockdep doesn't know this, use
128 * subclass to avoid triggering lockdep warning in such cases.
130 * The key is set by the readpage_end_io_hook after the buffer has passed
131 * csum validation but before the pages are unlocked. It is also set by
132 * btrfs_init_new_buffer on freshly allocated blocks.
134 * We also add a check to make sure the highest level of the tree is the
135 * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code
136 * needs update as well.
138 #ifdef CONFIG_DEBUG_LOCK_ALLOC
139 # if BTRFS_MAX_LEVEL != 8
143 static struct btrfs_lockdep_keyset
{
144 u64 id
; /* root objectid */
145 const char *name_stem
; /* lock name stem */
146 char names
[BTRFS_MAX_LEVEL
+ 1][20];
147 struct lock_class_key keys
[BTRFS_MAX_LEVEL
+ 1];
148 } btrfs_lockdep_keysets
[] = {
149 { .id
= BTRFS_ROOT_TREE_OBJECTID
, .name_stem
= "root" },
150 { .id
= BTRFS_EXTENT_TREE_OBJECTID
, .name_stem
= "extent" },
151 { .id
= BTRFS_CHUNK_TREE_OBJECTID
, .name_stem
= "chunk" },
152 { .id
= BTRFS_DEV_TREE_OBJECTID
, .name_stem
= "dev" },
153 { .id
= BTRFS_FS_TREE_OBJECTID
, .name_stem
= "fs" },
154 { .id
= BTRFS_CSUM_TREE_OBJECTID
, .name_stem
= "csum" },
155 { .id
= BTRFS_QUOTA_TREE_OBJECTID
, .name_stem
= "quota" },
156 { .id
= BTRFS_TREE_LOG_OBJECTID
, .name_stem
= "log" },
157 { .id
= BTRFS_TREE_RELOC_OBJECTID
, .name_stem
= "treloc" },
158 { .id
= BTRFS_DATA_RELOC_TREE_OBJECTID
, .name_stem
= "dreloc" },
159 { .id
= BTRFS_UUID_TREE_OBJECTID
, .name_stem
= "uuid" },
160 { .id
= 0, .name_stem
= "tree" },
163 void __init
btrfs_init_lockdep(void)
167 /* initialize lockdep class names */
168 for (i
= 0; i
< ARRAY_SIZE(btrfs_lockdep_keysets
); i
++) {
169 struct btrfs_lockdep_keyset
*ks
= &btrfs_lockdep_keysets
[i
];
171 for (j
= 0; j
< ARRAY_SIZE(ks
->names
); j
++)
172 snprintf(ks
->names
[j
], sizeof(ks
->names
[j
]),
173 "btrfs-%s-%02d", ks
->name_stem
, j
);
177 void btrfs_set_buffer_lockdep_class(u64 objectid
, struct extent_buffer
*eb
,
180 struct btrfs_lockdep_keyset
*ks
;
182 BUG_ON(level
>= ARRAY_SIZE(ks
->keys
));
184 /* find the matching keyset, id 0 is the default entry */
185 for (ks
= btrfs_lockdep_keysets
; ks
->id
; ks
++)
186 if (ks
->id
== objectid
)
189 lockdep_set_class_and_name(&eb
->lock
,
190 &ks
->keys
[level
], ks
->names
[level
]);
196 * extents on the btree inode are pretty simple, there's one extent
197 * that covers the entire device
199 static struct extent_map
*btree_get_extent(struct inode
*inode
,
200 struct page
*page
, size_t pg_offset
, u64 start
, u64 len
,
203 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
204 struct extent_map
*em
;
207 read_lock(&em_tree
->lock
);
208 em
= lookup_extent_mapping(em_tree
, start
, len
);
211 BTRFS_I(inode
)->root
->fs_info
->fs_devices
->latest_bdev
;
212 read_unlock(&em_tree
->lock
);
215 read_unlock(&em_tree
->lock
);
217 em
= alloc_extent_map();
219 em
= ERR_PTR(-ENOMEM
);
224 em
->block_len
= (u64
)-1;
226 em
->bdev
= BTRFS_I(inode
)->root
->fs_info
->fs_devices
->latest_bdev
;
228 write_lock(&em_tree
->lock
);
229 ret
= add_extent_mapping(em_tree
, em
, 0);
230 if (ret
== -EEXIST
) {
232 em
= lookup_extent_mapping(em_tree
, start
, len
);
239 write_unlock(&em_tree
->lock
);
245 u32
btrfs_csum_data(char *data
, u32 seed
, size_t len
)
247 return btrfs_crc32c(seed
, data
, len
);
250 void btrfs_csum_final(u32 crc
, char *result
)
252 put_unaligned_le32(~crc
, result
);
256 * compute the csum for a btree block, and either verify it or write it
257 * into the csum field of the block.
259 static int csum_tree_block(struct btrfs_root
*root
, struct extent_buffer
*buf
,
262 u16 csum_size
= btrfs_super_csum_size(root
->fs_info
->super_copy
);
265 unsigned long cur_len
;
266 unsigned long offset
= BTRFS_CSUM_SIZE
;
268 unsigned long map_start
;
269 unsigned long map_len
;
272 unsigned long inline_result
;
274 len
= buf
->len
- offset
;
276 err
= map_private_extent_buffer(buf
, offset
, 32,
277 &kaddr
, &map_start
, &map_len
);
280 cur_len
= min(len
, map_len
- (offset
- map_start
));
281 crc
= btrfs_csum_data(kaddr
+ offset
- map_start
,
286 if (csum_size
> sizeof(inline_result
)) {
287 result
= kzalloc(csum_size
* sizeof(char), GFP_NOFS
);
291 result
= (char *)&inline_result
;
294 btrfs_csum_final(crc
, result
);
297 if (memcmp_extent_buffer(buf
, result
, 0, csum_size
)) {
300 memcpy(&found
, result
, csum_size
);
302 read_extent_buffer(buf
, &val
, 0, csum_size
);
303 printk_ratelimited(KERN_INFO
304 "BTRFS: %s checksum verify failed on %llu wanted %X found %X "
306 root
->fs_info
->sb
->s_id
, buf
->start
,
307 val
, found
, btrfs_header_level(buf
));
308 if (result
!= (char *)&inline_result
)
313 write_extent_buffer(buf
, result
, 0, csum_size
);
315 if (result
!= (char *)&inline_result
)
321 * we can't consider a given block up to date unless the transid of the
322 * block matches the transid in the parent node's pointer. This is how we
323 * detect blocks that either didn't get written at all or got written
324 * in the wrong place.
326 static int verify_parent_transid(struct extent_io_tree
*io_tree
,
327 struct extent_buffer
*eb
, u64 parent_transid
,
330 struct extent_state
*cached_state
= NULL
;
333 if (!parent_transid
|| btrfs_header_generation(eb
) == parent_transid
)
339 lock_extent_bits(io_tree
, eb
->start
, eb
->start
+ eb
->len
- 1,
341 if (extent_buffer_uptodate(eb
) &&
342 btrfs_header_generation(eb
) == parent_transid
) {
346 printk_ratelimited("parent transid verify failed on %llu wanted %llu "
348 eb
->start
, parent_transid
, btrfs_header_generation(eb
));
350 clear_extent_buffer_uptodate(eb
);
352 unlock_extent_cached(io_tree
, eb
->start
, eb
->start
+ eb
->len
- 1,
353 &cached_state
, GFP_NOFS
);
358 * Return 0 if the superblock checksum type matches the checksum value of that
359 * algorithm. Pass the raw disk superblock data.
361 static int btrfs_check_super_csum(char *raw_disk_sb
)
363 struct btrfs_super_block
*disk_sb
=
364 (struct btrfs_super_block
*)raw_disk_sb
;
365 u16 csum_type
= btrfs_super_csum_type(disk_sb
);
368 if (csum_type
== BTRFS_CSUM_TYPE_CRC32
) {
370 const int csum_size
= sizeof(crc
);
371 char result
[csum_size
];
374 * The super_block structure does not span the whole
375 * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space
376 * is filled with zeros and is included in the checkum.
378 crc
= btrfs_csum_data(raw_disk_sb
+ BTRFS_CSUM_SIZE
,
379 crc
, BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
);
380 btrfs_csum_final(crc
, result
);
382 if (memcmp(raw_disk_sb
, result
, csum_size
))
385 if (ret
&& btrfs_super_generation(disk_sb
) < 10) {
387 "BTRFS: super block crcs don't match, older mkfs detected\n");
392 if (csum_type
>= ARRAY_SIZE(btrfs_csum_sizes
)) {
393 printk(KERN_ERR
"BTRFS: unsupported checksum algorithm %u\n",
402 * helper to read a given tree block, doing retries as required when
403 * the checksums don't match and we have alternate mirrors to try.
405 static int btree_read_extent_buffer_pages(struct btrfs_root
*root
,
406 struct extent_buffer
*eb
,
407 u64 start
, u64 parent_transid
)
409 struct extent_io_tree
*io_tree
;
414 int failed_mirror
= 0;
416 clear_bit(EXTENT_BUFFER_CORRUPT
, &eb
->bflags
);
417 io_tree
= &BTRFS_I(root
->fs_info
->btree_inode
)->io_tree
;
419 ret
= read_extent_buffer_pages(io_tree
, eb
, start
,
421 btree_get_extent
, mirror_num
);
423 if (!verify_parent_transid(io_tree
, eb
,
431 * This buffer's crc is fine, but its contents are corrupted, so
432 * there is no reason to read the other copies, they won't be
435 if (test_bit(EXTENT_BUFFER_CORRUPT
, &eb
->bflags
))
438 num_copies
= btrfs_num_copies(root
->fs_info
,
443 if (!failed_mirror
) {
445 failed_mirror
= eb
->read_mirror
;
449 if (mirror_num
== failed_mirror
)
452 if (mirror_num
> num_copies
)
456 if (failed
&& !ret
&& failed_mirror
)
457 repair_eb_io_failure(root
, eb
, failed_mirror
);
463 * checksum a dirty tree block before IO. This has extra checks to make sure
464 * we only fill in the checksum field in the first page of a multi-page block
467 static int csum_dirty_buffer(struct btrfs_root
*root
, struct page
*page
)
469 u64 start
= page_offset(page
);
471 struct extent_buffer
*eb
;
473 eb
= (struct extent_buffer
*)page
->private;
474 if (page
!= eb
->pages
[0])
476 found_start
= btrfs_header_bytenr(eb
);
477 if (WARN_ON(found_start
!= start
|| !PageUptodate(page
)))
479 csum_tree_block(root
, eb
, 0);
483 static int check_tree_block_fsid(struct btrfs_root
*root
,
484 struct extent_buffer
*eb
)
486 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
487 u8 fsid
[BTRFS_UUID_SIZE
];
490 read_extent_buffer(eb
, fsid
, btrfs_header_fsid(), BTRFS_FSID_SIZE
);
492 if (!memcmp(fsid
, fs_devices
->fsid
, BTRFS_FSID_SIZE
)) {
496 fs_devices
= fs_devices
->seed
;
501 #define CORRUPT(reason, eb, root, slot) \
502 btrfs_crit(root->fs_info, "corrupt leaf, %s: block=%llu," \
503 "root=%llu, slot=%d", reason, \
504 btrfs_header_bytenr(eb), root->objectid, slot)
506 static noinline
int check_leaf(struct btrfs_root
*root
,
507 struct extent_buffer
*leaf
)
509 struct btrfs_key key
;
510 struct btrfs_key leaf_key
;
511 u32 nritems
= btrfs_header_nritems(leaf
);
517 /* Check the 0 item */
518 if (btrfs_item_offset_nr(leaf
, 0) + btrfs_item_size_nr(leaf
, 0) !=
519 BTRFS_LEAF_DATA_SIZE(root
)) {
520 CORRUPT("invalid item offset size pair", leaf
, root
, 0);
525 * Check to make sure each items keys are in the correct order and their
526 * offsets make sense. We only have to loop through nritems-1 because
527 * we check the current slot against the next slot, which verifies the
528 * next slot's offset+size makes sense and that the current's slot
531 for (slot
= 0; slot
< nritems
- 1; slot
++) {
532 btrfs_item_key_to_cpu(leaf
, &leaf_key
, slot
);
533 btrfs_item_key_to_cpu(leaf
, &key
, slot
+ 1);
535 /* Make sure the keys are in the right order */
536 if (btrfs_comp_cpu_keys(&leaf_key
, &key
) >= 0) {
537 CORRUPT("bad key order", leaf
, root
, slot
);
542 * Make sure the offset and ends are right, remember that the
543 * item data starts at the end of the leaf and grows towards the
546 if (btrfs_item_offset_nr(leaf
, slot
) !=
547 btrfs_item_end_nr(leaf
, slot
+ 1)) {
548 CORRUPT("slot offset bad", leaf
, root
, slot
);
553 * Check to make sure that we don't point outside of the leaf,
554 * just incase all the items are consistent to eachother, but
555 * all point outside of the leaf.
557 if (btrfs_item_end_nr(leaf
, slot
) >
558 BTRFS_LEAF_DATA_SIZE(root
)) {
559 CORRUPT("slot end outside of leaf", leaf
, root
, slot
);
567 static int btree_readpage_end_io_hook(struct btrfs_io_bio
*io_bio
,
568 u64 phy_offset
, struct page
*page
,
569 u64 start
, u64 end
, int mirror
)
573 struct extent_buffer
*eb
;
574 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
581 eb
= (struct extent_buffer
*)page
->private;
583 /* the pending IO might have been the only thing that kept this buffer
584 * in memory. Make sure we have a ref for all this other checks
586 extent_buffer_get(eb
);
588 reads_done
= atomic_dec_and_test(&eb
->io_pages
);
592 eb
->read_mirror
= mirror
;
593 if (test_bit(EXTENT_BUFFER_IOERR
, &eb
->bflags
)) {
598 found_start
= btrfs_header_bytenr(eb
);
599 if (found_start
!= eb
->start
) {
600 printk_ratelimited(KERN_INFO
"BTRFS: bad tree block start "
602 found_start
, eb
->start
);
606 if (check_tree_block_fsid(root
, eb
)) {
607 printk_ratelimited(KERN_INFO
"BTRFS: bad fsid on block %llu\n",
612 found_level
= btrfs_header_level(eb
);
613 if (found_level
>= BTRFS_MAX_LEVEL
) {
614 btrfs_info(root
->fs_info
, "bad tree block level %d",
615 (int)btrfs_header_level(eb
));
620 btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb
),
623 ret
= csum_tree_block(root
, eb
, 1);
630 * If this is a leaf block and it is corrupt, set the corrupt bit so
631 * that we don't try and read the other copies of this block, just
634 if (found_level
== 0 && check_leaf(root
, eb
)) {
635 set_bit(EXTENT_BUFFER_CORRUPT
, &eb
->bflags
);
640 set_extent_buffer_uptodate(eb
);
643 test_and_clear_bit(EXTENT_BUFFER_READAHEAD
, &eb
->bflags
))
644 btree_readahead_hook(root
, eb
, eb
->start
, ret
);
648 * our io error hook is going to dec the io pages
649 * again, we have to make sure it has something
652 atomic_inc(&eb
->io_pages
);
653 clear_extent_buffer_uptodate(eb
);
655 free_extent_buffer(eb
);
660 static int btree_io_failed_hook(struct page
*page
, int failed_mirror
)
662 struct extent_buffer
*eb
;
663 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
665 eb
= (struct extent_buffer
*)page
->private;
666 set_bit(EXTENT_BUFFER_IOERR
, &eb
->bflags
);
667 eb
->read_mirror
= failed_mirror
;
668 atomic_dec(&eb
->io_pages
);
669 if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD
, &eb
->bflags
))
670 btree_readahead_hook(root
, eb
, eb
->start
, -EIO
);
671 return -EIO
; /* we fixed nothing */
674 static void end_workqueue_bio(struct bio
*bio
, int err
)
676 struct end_io_wq
*end_io_wq
= bio
->bi_private
;
677 struct btrfs_fs_info
*fs_info
;
679 fs_info
= end_io_wq
->info
;
680 end_io_wq
->error
= err
;
681 end_io_wq
->work
.func
= end_workqueue_fn
;
682 end_io_wq
->work
.flags
= 0;
684 if (bio
->bi_rw
& REQ_WRITE
) {
685 if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_METADATA
)
686 btrfs_queue_worker(&fs_info
->endio_meta_write_workers
,
688 else if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_FREE_SPACE
)
689 btrfs_queue_worker(&fs_info
->endio_freespace_worker
,
691 else if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_RAID56
)
692 btrfs_queue_worker(&fs_info
->endio_raid56_workers
,
695 btrfs_queue_worker(&fs_info
->endio_write_workers
,
698 if (end_io_wq
->metadata
== BTRFS_WQ_ENDIO_RAID56
)
699 btrfs_queue_worker(&fs_info
->endio_raid56_workers
,
701 else if (end_io_wq
->metadata
)
702 btrfs_queue_worker(&fs_info
->endio_meta_workers
,
705 btrfs_queue_worker(&fs_info
->endio_workers
,
711 * For the metadata arg you want
714 * 1 - if normal metadta
715 * 2 - if writing to the free space cache area
716 * 3 - raid parity work
718 int btrfs_bio_wq_end_io(struct btrfs_fs_info
*info
, struct bio
*bio
,
721 struct end_io_wq
*end_io_wq
;
722 end_io_wq
= kmalloc(sizeof(*end_io_wq
), GFP_NOFS
);
726 end_io_wq
->private = bio
->bi_private
;
727 end_io_wq
->end_io
= bio
->bi_end_io
;
728 end_io_wq
->info
= info
;
729 end_io_wq
->error
= 0;
730 end_io_wq
->bio
= bio
;
731 end_io_wq
->metadata
= metadata
;
733 bio
->bi_private
= end_io_wq
;
734 bio
->bi_end_io
= end_workqueue_bio
;
738 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info
*info
)
740 unsigned long limit
= min_t(unsigned long,
741 info
->thread_pool_size
,
742 info
->fs_devices
->open_devices
);
746 static void run_one_async_start(struct btrfs_work_struct
*work
)
748 struct async_submit_bio
*async
;
751 async
= container_of(work
, struct async_submit_bio
, work
);
752 ret
= async
->submit_bio_start(async
->inode
, async
->rw
, async
->bio
,
753 async
->mirror_num
, async
->bio_flags
,
759 static void run_one_async_done(struct btrfs_work_struct
*work
)
761 struct btrfs_fs_info
*fs_info
;
762 struct async_submit_bio
*async
;
765 async
= container_of(work
, struct async_submit_bio
, work
);
766 fs_info
= BTRFS_I(async
->inode
)->root
->fs_info
;
768 limit
= btrfs_async_submit_limit(fs_info
);
769 limit
= limit
* 2 / 3;
771 if (atomic_dec_return(&fs_info
->nr_async_submits
) < limit
&&
772 waitqueue_active(&fs_info
->async_submit_wait
))
773 wake_up(&fs_info
->async_submit_wait
);
775 /* If an error occured we just want to clean up the bio and move on */
777 bio_endio(async
->bio
, async
->error
);
781 async
->submit_bio_done(async
->inode
, async
->rw
, async
->bio
,
782 async
->mirror_num
, async
->bio_flags
,
786 static void run_one_async_free(struct btrfs_work_struct
*work
)
788 struct async_submit_bio
*async
;
790 async
= container_of(work
, struct async_submit_bio
, work
);
794 int btrfs_wq_submit_bio(struct btrfs_fs_info
*fs_info
, struct inode
*inode
,
795 int rw
, struct bio
*bio
, int mirror_num
,
796 unsigned long bio_flags
,
798 extent_submit_bio_hook_t
*submit_bio_start
,
799 extent_submit_bio_hook_t
*submit_bio_done
)
801 struct async_submit_bio
*async
;
803 async
= kmalloc(sizeof(*async
), GFP_NOFS
);
807 async
->inode
= inode
;
810 async
->mirror_num
= mirror_num
;
811 async
->submit_bio_start
= submit_bio_start
;
812 async
->submit_bio_done
= submit_bio_done
;
814 btrfs_init_work(&async
->work
, run_one_async_start
,
815 run_one_async_done
, run_one_async_free
);
817 async
->bio_flags
= bio_flags
;
818 async
->bio_offset
= bio_offset
;
822 atomic_inc(&fs_info
->nr_async_submits
);
825 btrfs_set_work_high_priority(&async
->work
);
827 btrfs_queue_work(fs_info
->workers
, &async
->work
);
829 while (atomic_read(&fs_info
->async_submit_draining
) &&
830 atomic_read(&fs_info
->nr_async_submits
)) {
831 wait_event(fs_info
->async_submit_wait
,
832 (atomic_read(&fs_info
->nr_async_submits
) == 0));
838 static int btree_csum_one_bio(struct bio
*bio
)
840 struct bio_vec
*bvec
= bio
->bi_io_vec
;
842 struct btrfs_root
*root
;
845 WARN_ON(bio
->bi_vcnt
<= 0);
846 while (bio_index
< bio
->bi_vcnt
) {
847 root
= BTRFS_I(bvec
->bv_page
->mapping
->host
)->root
;
848 ret
= csum_dirty_buffer(root
, bvec
->bv_page
);
857 static int __btree_submit_bio_start(struct inode
*inode
, int rw
,
858 struct bio
*bio
, int mirror_num
,
859 unsigned long bio_flags
,
863 * when we're called for a write, we're already in the async
864 * submission context. Just jump into btrfs_map_bio
866 return btree_csum_one_bio(bio
);
869 static int __btree_submit_bio_done(struct inode
*inode
, int rw
, struct bio
*bio
,
870 int mirror_num
, unsigned long bio_flags
,
876 * when we're called for a write, we're already in the async
877 * submission context. Just jump into btrfs_map_bio
879 ret
= btrfs_map_bio(BTRFS_I(inode
)->root
, rw
, bio
, mirror_num
, 1);
885 static int check_async_write(struct inode
*inode
, unsigned long bio_flags
)
887 if (bio_flags
& EXTENT_BIO_TREE_LOG
)
896 static int btree_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
,
897 int mirror_num
, unsigned long bio_flags
,
900 int async
= check_async_write(inode
, bio_flags
);
903 if (!(rw
& REQ_WRITE
)) {
905 * called for a read, do the setup so that checksum validation
906 * can happen in the async kernel threads
908 ret
= btrfs_bio_wq_end_io(BTRFS_I(inode
)->root
->fs_info
,
912 ret
= btrfs_map_bio(BTRFS_I(inode
)->root
, rw
, bio
,
915 ret
= btree_csum_one_bio(bio
);
918 ret
= btrfs_map_bio(BTRFS_I(inode
)->root
, rw
, bio
,
922 * kthread helpers are used to submit writes so that
923 * checksumming can happen in parallel across all CPUs
925 ret
= btrfs_wq_submit_bio(BTRFS_I(inode
)->root
->fs_info
,
926 inode
, rw
, bio
, mirror_num
, 0,
928 __btree_submit_bio_start
,
929 __btree_submit_bio_done
);
939 #ifdef CONFIG_MIGRATION
940 static int btree_migratepage(struct address_space
*mapping
,
941 struct page
*newpage
, struct page
*page
,
942 enum migrate_mode mode
)
945 * we can't safely write a btree page from here,
946 * we haven't done the locking hook
951 * Buffers may be managed in a filesystem specific way.
952 * We must have no buffers or drop them.
954 if (page_has_private(page
) &&
955 !try_to_release_page(page
, GFP_KERNEL
))
957 return migrate_page(mapping
, newpage
, page
, mode
);
962 static int btree_writepages(struct address_space
*mapping
,
963 struct writeback_control
*wbc
)
965 struct btrfs_fs_info
*fs_info
;
968 if (wbc
->sync_mode
== WB_SYNC_NONE
) {
970 if (wbc
->for_kupdate
)
973 fs_info
= BTRFS_I(mapping
->host
)->root
->fs_info
;
974 /* this is a bit racy, but that's ok */
975 ret
= percpu_counter_compare(&fs_info
->dirty_metadata_bytes
,
976 BTRFS_DIRTY_METADATA_THRESH
);
980 return btree_write_cache_pages(mapping
, wbc
);
983 static int btree_readpage(struct file
*file
, struct page
*page
)
985 struct extent_io_tree
*tree
;
986 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
987 return extent_read_full_page(tree
, page
, btree_get_extent
, 0);
990 static int btree_releasepage(struct page
*page
, gfp_t gfp_flags
)
992 if (PageWriteback(page
) || PageDirty(page
))
995 return try_release_extent_buffer(page
);
998 static void btree_invalidatepage(struct page
*page
, unsigned int offset
,
1001 struct extent_io_tree
*tree
;
1002 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
1003 extent_invalidatepage(tree
, page
, offset
);
1004 btree_releasepage(page
, GFP_NOFS
);
1005 if (PagePrivate(page
)) {
1006 btrfs_warn(BTRFS_I(page
->mapping
->host
)->root
->fs_info
,
1007 "page private not zero on page %llu",
1008 (unsigned long long)page_offset(page
));
1009 ClearPagePrivate(page
);
1010 set_page_private(page
, 0);
1011 page_cache_release(page
);
1015 static int btree_set_page_dirty(struct page
*page
)
1018 struct extent_buffer
*eb
;
1020 BUG_ON(!PagePrivate(page
));
1021 eb
= (struct extent_buffer
*)page
->private;
1023 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY
, &eb
->bflags
));
1024 BUG_ON(!atomic_read(&eb
->refs
));
1025 btrfs_assert_tree_locked(eb
);
1027 return __set_page_dirty_nobuffers(page
);
1030 static const struct address_space_operations btree_aops
= {
1031 .readpage
= btree_readpage
,
1032 .writepages
= btree_writepages
,
1033 .releasepage
= btree_releasepage
,
1034 .invalidatepage
= btree_invalidatepage
,
1035 #ifdef CONFIG_MIGRATION
1036 .migratepage
= btree_migratepage
,
1038 .set_page_dirty
= btree_set_page_dirty
,
1041 int readahead_tree_block(struct btrfs_root
*root
, u64 bytenr
, u32 blocksize
,
1044 struct extent_buffer
*buf
= NULL
;
1045 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
1048 buf
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
1051 read_extent_buffer_pages(&BTRFS_I(btree_inode
)->io_tree
,
1052 buf
, 0, WAIT_NONE
, btree_get_extent
, 0);
1053 free_extent_buffer(buf
);
1057 int reada_tree_block_flagged(struct btrfs_root
*root
, u64 bytenr
, u32 blocksize
,
1058 int mirror_num
, struct extent_buffer
**eb
)
1060 struct extent_buffer
*buf
= NULL
;
1061 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
1062 struct extent_io_tree
*io_tree
= &BTRFS_I(btree_inode
)->io_tree
;
1065 buf
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
1069 set_bit(EXTENT_BUFFER_READAHEAD
, &buf
->bflags
);
1071 ret
= read_extent_buffer_pages(io_tree
, buf
, 0, WAIT_PAGE_LOCK
,
1072 btree_get_extent
, mirror_num
);
1074 free_extent_buffer(buf
);
1078 if (test_bit(EXTENT_BUFFER_CORRUPT
, &buf
->bflags
)) {
1079 free_extent_buffer(buf
);
1081 } else if (extent_buffer_uptodate(buf
)) {
1084 free_extent_buffer(buf
);
1089 struct extent_buffer
*btrfs_find_tree_block(struct btrfs_root
*root
,
1090 u64 bytenr
, u32 blocksize
)
1092 return find_extent_buffer(root
->fs_info
, bytenr
);
1095 struct extent_buffer
*btrfs_find_create_tree_block(struct btrfs_root
*root
,
1096 u64 bytenr
, u32 blocksize
)
1098 return alloc_extent_buffer(root
->fs_info
, bytenr
, blocksize
);
1102 int btrfs_write_tree_block(struct extent_buffer
*buf
)
1104 return filemap_fdatawrite_range(buf
->pages
[0]->mapping
, buf
->start
,
1105 buf
->start
+ buf
->len
- 1);
1108 int btrfs_wait_tree_block_writeback(struct extent_buffer
*buf
)
1110 return filemap_fdatawait_range(buf
->pages
[0]->mapping
,
1111 buf
->start
, buf
->start
+ buf
->len
- 1);
1114 struct extent_buffer
*read_tree_block(struct btrfs_root
*root
, u64 bytenr
,
1115 u32 blocksize
, u64 parent_transid
)
1117 struct extent_buffer
*buf
= NULL
;
1120 buf
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
1124 ret
= btree_read_extent_buffer_pages(root
, buf
, 0, parent_transid
);
1126 free_extent_buffer(buf
);
1133 void clean_tree_block(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1134 struct extent_buffer
*buf
)
1136 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1138 if (btrfs_header_generation(buf
) ==
1139 fs_info
->running_transaction
->transid
) {
1140 btrfs_assert_tree_locked(buf
);
1142 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY
, &buf
->bflags
)) {
1143 __percpu_counter_add(&fs_info
->dirty_metadata_bytes
,
1145 fs_info
->dirty_metadata_batch
);
1146 /* ugh, clear_extent_buffer_dirty needs to lock the page */
1147 btrfs_set_lock_blocking(buf
);
1148 clear_extent_buffer_dirty(buf
);
1153 static void __setup_root(u32 nodesize
, u32 leafsize
, u32 sectorsize
,
1154 u32 stripesize
, struct btrfs_root
*root
,
1155 struct btrfs_fs_info
*fs_info
,
1159 root
->commit_root
= NULL
;
1160 root
->sectorsize
= sectorsize
;
1161 root
->nodesize
= nodesize
;
1162 root
->leafsize
= leafsize
;
1163 root
->stripesize
= stripesize
;
1165 root
->track_dirty
= 0;
1167 root
->orphan_item_inserted
= 0;
1168 root
->orphan_cleanup_state
= 0;
1170 root
->objectid
= objectid
;
1171 root
->last_trans
= 0;
1172 root
->highest_objectid
= 0;
1173 root
->nr_delalloc_inodes
= 0;
1174 root
->nr_ordered_extents
= 0;
1176 root
->inode_tree
= RB_ROOT
;
1177 INIT_RADIX_TREE(&root
->delayed_nodes_tree
, GFP_ATOMIC
);
1178 root
->block_rsv
= NULL
;
1179 root
->orphan_block_rsv
= NULL
;
1181 INIT_LIST_HEAD(&root
->dirty_list
);
1182 INIT_LIST_HEAD(&root
->root_list
);
1183 INIT_LIST_HEAD(&root
->delalloc_inodes
);
1184 INIT_LIST_HEAD(&root
->delalloc_root
);
1185 INIT_LIST_HEAD(&root
->ordered_extents
);
1186 INIT_LIST_HEAD(&root
->ordered_root
);
1187 INIT_LIST_HEAD(&root
->logged_list
[0]);
1188 INIT_LIST_HEAD(&root
->logged_list
[1]);
1189 spin_lock_init(&root
->orphan_lock
);
1190 spin_lock_init(&root
->inode_lock
);
1191 spin_lock_init(&root
->delalloc_lock
);
1192 spin_lock_init(&root
->ordered_extent_lock
);
1193 spin_lock_init(&root
->accounting_lock
);
1194 spin_lock_init(&root
->log_extents_lock
[0]);
1195 spin_lock_init(&root
->log_extents_lock
[1]);
1196 mutex_init(&root
->objectid_mutex
);
1197 mutex_init(&root
->log_mutex
);
1198 init_waitqueue_head(&root
->log_writer_wait
);
1199 init_waitqueue_head(&root
->log_commit_wait
[0]);
1200 init_waitqueue_head(&root
->log_commit_wait
[1]);
1201 INIT_LIST_HEAD(&root
->log_ctxs
[0]);
1202 INIT_LIST_HEAD(&root
->log_ctxs
[1]);
1203 atomic_set(&root
->log_commit
[0], 0);
1204 atomic_set(&root
->log_commit
[1], 0);
1205 atomic_set(&root
->log_writers
, 0);
1206 atomic_set(&root
->log_batch
, 0);
1207 atomic_set(&root
->orphan_inodes
, 0);
1208 atomic_set(&root
->refs
, 1);
1209 root
->log_transid
= 0;
1210 root
->log_transid_committed
= -1;
1211 root
->last_log_commit
= 0;
1213 extent_io_tree_init(&root
->dirty_log_pages
,
1214 fs_info
->btree_inode
->i_mapping
);
1216 memset(&root
->root_key
, 0, sizeof(root
->root_key
));
1217 memset(&root
->root_item
, 0, sizeof(root
->root_item
));
1218 memset(&root
->defrag_progress
, 0, sizeof(root
->defrag_progress
));
1219 memset(&root
->root_kobj
, 0, sizeof(root
->root_kobj
));
1221 root
->defrag_trans_start
= fs_info
->generation
;
1223 root
->defrag_trans_start
= 0;
1224 init_completion(&root
->kobj_unregister
);
1225 root
->defrag_running
= 0;
1226 root
->root_key
.objectid
= objectid
;
1229 spin_lock_init(&root
->root_item_lock
);
1232 static struct btrfs_root
*btrfs_alloc_root(struct btrfs_fs_info
*fs_info
)
1234 struct btrfs_root
*root
= kzalloc(sizeof(*root
), GFP_NOFS
);
1236 root
->fs_info
= fs_info
;
1240 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1241 /* Should only be used by the testing infrastructure */
1242 struct btrfs_root
*btrfs_alloc_dummy_root(void)
1244 struct btrfs_root
*root
;
1246 root
= btrfs_alloc_root(NULL
);
1248 return ERR_PTR(-ENOMEM
);
1249 __setup_root(4096, 4096, 4096, 4096, root
, NULL
, 1);
1250 root
->dummy_root
= 1;
1256 struct btrfs_root
*btrfs_create_tree(struct btrfs_trans_handle
*trans
,
1257 struct btrfs_fs_info
*fs_info
,
1260 struct extent_buffer
*leaf
;
1261 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
1262 struct btrfs_root
*root
;
1263 struct btrfs_key key
;
1267 root
= btrfs_alloc_root(fs_info
);
1269 return ERR_PTR(-ENOMEM
);
1271 __setup_root(tree_root
->nodesize
, tree_root
->leafsize
,
1272 tree_root
->sectorsize
, tree_root
->stripesize
,
1273 root
, fs_info
, objectid
);
1274 root
->root_key
.objectid
= objectid
;
1275 root
->root_key
.type
= BTRFS_ROOT_ITEM_KEY
;
1276 root
->root_key
.offset
= 0;
1278 leaf
= btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
1279 0, objectid
, NULL
, 0, 0, 0);
1281 ret
= PTR_ERR(leaf
);
1286 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
1287 btrfs_set_header_bytenr(leaf
, leaf
->start
);
1288 btrfs_set_header_generation(leaf
, trans
->transid
);
1289 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
1290 btrfs_set_header_owner(leaf
, objectid
);
1293 write_extent_buffer(leaf
, fs_info
->fsid
, btrfs_header_fsid(),
1295 write_extent_buffer(leaf
, fs_info
->chunk_tree_uuid
,
1296 btrfs_header_chunk_tree_uuid(leaf
),
1298 btrfs_mark_buffer_dirty(leaf
);
1300 root
->commit_root
= btrfs_root_node(root
);
1301 root
->track_dirty
= 1;
1304 root
->root_item
.flags
= 0;
1305 root
->root_item
.byte_limit
= 0;
1306 btrfs_set_root_bytenr(&root
->root_item
, leaf
->start
);
1307 btrfs_set_root_generation(&root
->root_item
, trans
->transid
);
1308 btrfs_set_root_level(&root
->root_item
, 0);
1309 btrfs_set_root_refs(&root
->root_item
, 1);
1310 btrfs_set_root_used(&root
->root_item
, leaf
->len
);
1311 btrfs_set_root_last_snapshot(&root
->root_item
, 0);
1312 btrfs_set_root_dirid(&root
->root_item
, 0);
1314 memcpy(root
->root_item
.uuid
, uuid
.b
, BTRFS_UUID_SIZE
);
1315 root
->root_item
.drop_level
= 0;
1317 key
.objectid
= objectid
;
1318 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1320 ret
= btrfs_insert_root(trans
, tree_root
, &key
, &root
->root_item
);
1324 btrfs_tree_unlock(leaf
);
1330 btrfs_tree_unlock(leaf
);
1331 free_extent_buffer(leaf
);
1335 return ERR_PTR(ret
);
1338 static struct btrfs_root
*alloc_log_tree(struct btrfs_trans_handle
*trans
,
1339 struct btrfs_fs_info
*fs_info
)
1341 struct btrfs_root
*root
;
1342 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
1343 struct extent_buffer
*leaf
;
1345 root
= btrfs_alloc_root(fs_info
);
1347 return ERR_PTR(-ENOMEM
);
1349 __setup_root(tree_root
->nodesize
, tree_root
->leafsize
,
1350 tree_root
->sectorsize
, tree_root
->stripesize
,
1351 root
, fs_info
, BTRFS_TREE_LOG_OBJECTID
);
1353 root
->root_key
.objectid
= BTRFS_TREE_LOG_OBJECTID
;
1354 root
->root_key
.type
= BTRFS_ROOT_ITEM_KEY
;
1355 root
->root_key
.offset
= BTRFS_TREE_LOG_OBJECTID
;
1357 * log trees do not get reference counted because they go away
1358 * before a real commit is actually done. They do store pointers
1359 * to file data extents, and those reference counts still get
1360 * updated (along with back refs to the log tree).
1364 leaf
= btrfs_alloc_free_block(trans
, root
, root
->leafsize
, 0,
1365 BTRFS_TREE_LOG_OBJECTID
, NULL
,
1369 return ERR_CAST(leaf
);
1372 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
1373 btrfs_set_header_bytenr(leaf
, leaf
->start
);
1374 btrfs_set_header_generation(leaf
, trans
->transid
);
1375 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
1376 btrfs_set_header_owner(leaf
, BTRFS_TREE_LOG_OBJECTID
);
1379 write_extent_buffer(root
->node
, root
->fs_info
->fsid
,
1380 btrfs_header_fsid(), BTRFS_FSID_SIZE
);
1381 btrfs_mark_buffer_dirty(root
->node
);
1382 btrfs_tree_unlock(root
->node
);
1386 int btrfs_init_log_root_tree(struct btrfs_trans_handle
*trans
,
1387 struct btrfs_fs_info
*fs_info
)
1389 struct btrfs_root
*log_root
;
1391 log_root
= alloc_log_tree(trans
, fs_info
);
1392 if (IS_ERR(log_root
))
1393 return PTR_ERR(log_root
);
1394 WARN_ON(fs_info
->log_root_tree
);
1395 fs_info
->log_root_tree
= log_root
;
1399 int btrfs_add_log_tree(struct btrfs_trans_handle
*trans
,
1400 struct btrfs_root
*root
)
1402 struct btrfs_root
*log_root
;
1403 struct btrfs_inode_item
*inode_item
;
1405 log_root
= alloc_log_tree(trans
, root
->fs_info
);
1406 if (IS_ERR(log_root
))
1407 return PTR_ERR(log_root
);
1409 log_root
->last_trans
= trans
->transid
;
1410 log_root
->root_key
.offset
= root
->root_key
.objectid
;
1412 inode_item
= &log_root
->root_item
.inode
;
1413 btrfs_set_stack_inode_generation(inode_item
, 1);
1414 btrfs_set_stack_inode_size(inode_item
, 3);
1415 btrfs_set_stack_inode_nlink(inode_item
, 1);
1416 btrfs_set_stack_inode_nbytes(inode_item
, root
->leafsize
);
1417 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
1419 btrfs_set_root_node(&log_root
->root_item
, log_root
->node
);
1421 WARN_ON(root
->log_root
);
1422 root
->log_root
= log_root
;
1423 root
->log_transid
= 0;
1424 root
->log_transid_committed
= -1;
1425 root
->last_log_commit
= 0;
1429 static struct btrfs_root
*btrfs_read_tree_root(struct btrfs_root
*tree_root
,
1430 struct btrfs_key
*key
)
1432 struct btrfs_root
*root
;
1433 struct btrfs_fs_info
*fs_info
= tree_root
->fs_info
;
1434 struct btrfs_path
*path
;
1439 path
= btrfs_alloc_path();
1441 return ERR_PTR(-ENOMEM
);
1443 root
= btrfs_alloc_root(fs_info
);
1449 __setup_root(tree_root
->nodesize
, tree_root
->leafsize
,
1450 tree_root
->sectorsize
, tree_root
->stripesize
,
1451 root
, fs_info
, key
->objectid
);
1453 ret
= btrfs_find_root(tree_root
, key
, path
,
1454 &root
->root_item
, &root
->root_key
);
1461 generation
= btrfs_root_generation(&root
->root_item
);
1462 blocksize
= btrfs_level_size(root
, btrfs_root_level(&root
->root_item
));
1463 root
->node
= read_tree_block(root
, btrfs_root_bytenr(&root
->root_item
),
1464 blocksize
, generation
);
1468 } else if (!btrfs_buffer_uptodate(root
->node
, generation
, 0)) {
1472 root
->commit_root
= btrfs_root_node(root
);
1474 btrfs_free_path(path
);
1478 free_extent_buffer(root
->node
);
1482 root
= ERR_PTR(ret
);
1486 struct btrfs_root
*btrfs_read_fs_root(struct btrfs_root
*tree_root
,
1487 struct btrfs_key
*location
)
1489 struct btrfs_root
*root
;
1491 root
= btrfs_read_tree_root(tree_root
, location
);
1495 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
1497 btrfs_check_and_init_root_item(&root
->root_item
);
1503 int btrfs_init_fs_root(struct btrfs_root
*root
)
1507 root
->free_ino_ctl
= kzalloc(sizeof(*root
->free_ino_ctl
), GFP_NOFS
);
1508 root
->free_ino_pinned
= kzalloc(sizeof(*root
->free_ino_pinned
),
1510 if (!root
->free_ino_pinned
|| !root
->free_ino_ctl
) {
1515 btrfs_init_free_ino_ctl(root
);
1516 mutex_init(&root
->fs_commit_mutex
);
1517 spin_lock_init(&root
->cache_lock
);
1518 init_waitqueue_head(&root
->cache_wait
);
1520 ret
= get_anon_bdev(&root
->anon_dev
);
1525 kfree(root
->free_ino_ctl
);
1526 kfree(root
->free_ino_pinned
);
1530 static struct btrfs_root
*btrfs_lookup_fs_root(struct btrfs_fs_info
*fs_info
,
1533 struct btrfs_root
*root
;
1535 spin_lock(&fs_info
->fs_roots_radix_lock
);
1536 root
= radix_tree_lookup(&fs_info
->fs_roots_radix
,
1537 (unsigned long)root_id
);
1538 spin_unlock(&fs_info
->fs_roots_radix_lock
);
1542 int btrfs_insert_fs_root(struct btrfs_fs_info
*fs_info
,
1543 struct btrfs_root
*root
)
1547 ret
= radix_tree_preload(GFP_NOFS
& ~__GFP_HIGHMEM
);
1551 spin_lock(&fs_info
->fs_roots_radix_lock
);
1552 ret
= radix_tree_insert(&fs_info
->fs_roots_radix
,
1553 (unsigned long)root
->root_key
.objectid
,
1557 spin_unlock(&fs_info
->fs_roots_radix_lock
);
1558 radix_tree_preload_end();
1563 struct btrfs_root
*btrfs_get_fs_root(struct btrfs_fs_info
*fs_info
,
1564 struct btrfs_key
*location
,
1567 struct btrfs_root
*root
;
1570 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
1571 return fs_info
->tree_root
;
1572 if (location
->objectid
== BTRFS_EXTENT_TREE_OBJECTID
)
1573 return fs_info
->extent_root
;
1574 if (location
->objectid
== BTRFS_CHUNK_TREE_OBJECTID
)
1575 return fs_info
->chunk_root
;
1576 if (location
->objectid
== BTRFS_DEV_TREE_OBJECTID
)
1577 return fs_info
->dev_root
;
1578 if (location
->objectid
== BTRFS_CSUM_TREE_OBJECTID
)
1579 return fs_info
->csum_root
;
1580 if (location
->objectid
== BTRFS_QUOTA_TREE_OBJECTID
)
1581 return fs_info
->quota_root
? fs_info
->quota_root
:
1583 if (location
->objectid
== BTRFS_UUID_TREE_OBJECTID
)
1584 return fs_info
->uuid_root
? fs_info
->uuid_root
:
1587 root
= btrfs_lookup_fs_root(fs_info
, location
->objectid
);
1589 if (check_ref
&& btrfs_root_refs(&root
->root_item
) == 0)
1590 return ERR_PTR(-ENOENT
);
1594 root
= btrfs_read_fs_root(fs_info
->tree_root
, location
);
1598 if (check_ref
&& btrfs_root_refs(&root
->root_item
) == 0) {
1603 ret
= btrfs_init_fs_root(root
);
1607 ret
= btrfs_find_item(fs_info
->tree_root
, NULL
, BTRFS_ORPHAN_OBJECTID
,
1608 location
->objectid
, BTRFS_ORPHAN_ITEM_KEY
, NULL
);
1612 root
->orphan_item_inserted
= 1;
1614 ret
= btrfs_insert_fs_root(fs_info
, root
);
1616 if (ret
== -EEXIST
) {
1625 return ERR_PTR(ret
);
1628 static int btrfs_congested_fn(void *congested_data
, int bdi_bits
)
1630 struct btrfs_fs_info
*info
= (struct btrfs_fs_info
*)congested_data
;
1632 struct btrfs_device
*device
;
1633 struct backing_dev_info
*bdi
;
1636 list_for_each_entry_rcu(device
, &info
->fs_devices
->devices
, dev_list
) {
1639 bdi
= blk_get_backing_dev_info(device
->bdev
);
1640 if (bdi
&& bdi_congested(bdi
, bdi_bits
)) {
1650 * If this fails, caller must call bdi_destroy() to get rid of the
1653 static int setup_bdi(struct btrfs_fs_info
*info
, struct backing_dev_info
*bdi
)
1657 bdi
->capabilities
= BDI_CAP_MAP_COPY
;
1658 err
= bdi_setup_and_register(bdi
, "btrfs", BDI_CAP_MAP_COPY
);
1662 bdi
->ra_pages
= default_backing_dev_info
.ra_pages
;
1663 bdi
->congested_fn
= btrfs_congested_fn
;
1664 bdi
->congested_data
= info
;
1669 * called by the kthread helper functions to finally call the bio end_io
1670 * functions. This is where read checksum verification actually happens
1672 static void end_workqueue_fn(struct btrfs_work
*work
)
1675 struct end_io_wq
*end_io_wq
;
1678 end_io_wq
= container_of(work
, struct end_io_wq
, work
);
1679 bio
= end_io_wq
->bio
;
1681 error
= end_io_wq
->error
;
1682 bio
->bi_private
= end_io_wq
->private;
1683 bio
->bi_end_io
= end_io_wq
->end_io
;
1685 bio_endio(bio
, error
);
1688 static int cleaner_kthread(void *arg
)
1690 struct btrfs_root
*root
= arg
;
1696 /* Make the cleaner go to sleep early. */
1697 if (btrfs_need_cleaner_sleep(root
))
1700 if (!mutex_trylock(&root
->fs_info
->cleaner_mutex
))
1704 * Avoid the problem that we change the status of the fs
1705 * during the above check and trylock.
1707 if (btrfs_need_cleaner_sleep(root
)) {
1708 mutex_unlock(&root
->fs_info
->cleaner_mutex
);
1712 btrfs_run_delayed_iputs(root
);
1713 again
= btrfs_clean_one_deleted_snapshot(root
);
1714 mutex_unlock(&root
->fs_info
->cleaner_mutex
);
1717 * The defragger has dealt with the R/O remount and umount,
1718 * needn't do anything special here.
1720 btrfs_run_defrag_inodes(root
->fs_info
);
1722 if (!try_to_freeze() && !again
) {
1723 set_current_state(TASK_INTERRUPTIBLE
);
1724 if (!kthread_should_stop())
1726 __set_current_state(TASK_RUNNING
);
1728 } while (!kthread_should_stop());
1732 static int transaction_kthread(void *arg
)
1734 struct btrfs_root
*root
= arg
;
1735 struct btrfs_trans_handle
*trans
;
1736 struct btrfs_transaction
*cur
;
1739 unsigned long delay
;
1743 cannot_commit
= false;
1744 delay
= HZ
* root
->fs_info
->commit_interval
;
1745 mutex_lock(&root
->fs_info
->transaction_kthread_mutex
);
1747 spin_lock(&root
->fs_info
->trans_lock
);
1748 cur
= root
->fs_info
->running_transaction
;
1750 spin_unlock(&root
->fs_info
->trans_lock
);
1754 now
= get_seconds();
1755 if (cur
->state
< TRANS_STATE_BLOCKED
&&
1756 (now
< cur
->start_time
||
1757 now
- cur
->start_time
< root
->fs_info
->commit_interval
)) {
1758 spin_unlock(&root
->fs_info
->trans_lock
);
1762 transid
= cur
->transid
;
1763 spin_unlock(&root
->fs_info
->trans_lock
);
1765 /* If the file system is aborted, this will always fail. */
1766 trans
= btrfs_attach_transaction(root
);
1767 if (IS_ERR(trans
)) {
1768 if (PTR_ERR(trans
) != -ENOENT
)
1769 cannot_commit
= true;
1772 if (transid
== trans
->transid
) {
1773 btrfs_commit_transaction(trans
, root
);
1775 btrfs_end_transaction(trans
, root
);
1778 wake_up_process(root
->fs_info
->cleaner_kthread
);
1779 mutex_unlock(&root
->fs_info
->transaction_kthread_mutex
);
1781 if (unlikely(test_bit(BTRFS_FS_STATE_ERROR
,
1782 &root
->fs_info
->fs_state
)))
1783 btrfs_cleanup_transaction(root
);
1784 if (!try_to_freeze()) {
1785 set_current_state(TASK_INTERRUPTIBLE
);
1786 if (!kthread_should_stop() &&
1787 (!btrfs_transaction_blocked(root
->fs_info
) ||
1789 schedule_timeout(delay
);
1790 __set_current_state(TASK_RUNNING
);
1792 } while (!kthread_should_stop());
1797 * this will find the highest generation in the array of
1798 * root backups. The index of the highest array is returned,
1799 * or -1 if we can't find anything.
1801 * We check to make sure the array is valid by comparing the
1802 * generation of the latest root in the array with the generation
1803 * in the super block. If they don't match we pitch it.
1805 static int find_newest_super_backup(struct btrfs_fs_info
*info
, u64 newest_gen
)
1808 int newest_index
= -1;
1809 struct btrfs_root_backup
*root_backup
;
1812 for (i
= 0; i
< BTRFS_NUM_BACKUP_ROOTS
; i
++) {
1813 root_backup
= info
->super_copy
->super_roots
+ i
;
1814 cur
= btrfs_backup_tree_root_gen(root_backup
);
1815 if (cur
== newest_gen
)
1819 /* check to see if we actually wrapped around */
1820 if (newest_index
== BTRFS_NUM_BACKUP_ROOTS
- 1) {
1821 root_backup
= info
->super_copy
->super_roots
;
1822 cur
= btrfs_backup_tree_root_gen(root_backup
);
1823 if (cur
== newest_gen
)
1826 return newest_index
;
1831 * find the oldest backup so we know where to store new entries
1832 * in the backup array. This will set the backup_root_index
1833 * field in the fs_info struct
1835 static void find_oldest_super_backup(struct btrfs_fs_info
*info
,
1838 int newest_index
= -1;
1840 newest_index
= find_newest_super_backup(info
, newest_gen
);
1841 /* if there was garbage in there, just move along */
1842 if (newest_index
== -1) {
1843 info
->backup_root_index
= 0;
1845 info
->backup_root_index
= (newest_index
+ 1) % BTRFS_NUM_BACKUP_ROOTS
;
1850 * copy all the root pointers into the super backup array.
1851 * this will bump the backup pointer by one when it is
1854 static void backup_super_roots(struct btrfs_fs_info
*info
)
1857 struct btrfs_root_backup
*root_backup
;
1860 next_backup
= info
->backup_root_index
;
1861 last_backup
= (next_backup
+ BTRFS_NUM_BACKUP_ROOTS
- 1) %
1862 BTRFS_NUM_BACKUP_ROOTS
;
1865 * just overwrite the last backup if we're at the same generation
1866 * this happens only at umount
1868 root_backup
= info
->super_for_commit
->super_roots
+ last_backup
;
1869 if (btrfs_backup_tree_root_gen(root_backup
) ==
1870 btrfs_header_generation(info
->tree_root
->node
))
1871 next_backup
= last_backup
;
1873 root_backup
= info
->super_for_commit
->super_roots
+ next_backup
;
1876 * make sure all of our padding and empty slots get zero filled
1877 * regardless of which ones we use today
1879 memset(root_backup
, 0, sizeof(*root_backup
));
1881 info
->backup_root_index
= (next_backup
+ 1) % BTRFS_NUM_BACKUP_ROOTS
;
1883 btrfs_set_backup_tree_root(root_backup
, info
->tree_root
->node
->start
);
1884 btrfs_set_backup_tree_root_gen(root_backup
,
1885 btrfs_header_generation(info
->tree_root
->node
));
1887 btrfs_set_backup_tree_root_level(root_backup
,
1888 btrfs_header_level(info
->tree_root
->node
));
1890 btrfs_set_backup_chunk_root(root_backup
, info
->chunk_root
->node
->start
);
1891 btrfs_set_backup_chunk_root_gen(root_backup
,
1892 btrfs_header_generation(info
->chunk_root
->node
));
1893 btrfs_set_backup_chunk_root_level(root_backup
,
1894 btrfs_header_level(info
->chunk_root
->node
));
1896 btrfs_set_backup_extent_root(root_backup
, info
->extent_root
->node
->start
);
1897 btrfs_set_backup_extent_root_gen(root_backup
,
1898 btrfs_header_generation(info
->extent_root
->node
));
1899 btrfs_set_backup_extent_root_level(root_backup
,
1900 btrfs_header_level(info
->extent_root
->node
));
1903 * we might commit during log recovery, which happens before we set
1904 * the fs_root. Make sure it is valid before we fill it in.
1906 if (info
->fs_root
&& info
->fs_root
->node
) {
1907 btrfs_set_backup_fs_root(root_backup
,
1908 info
->fs_root
->node
->start
);
1909 btrfs_set_backup_fs_root_gen(root_backup
,
1910 btrfs_header_generation(info
->fs_root
->node
));
1911 btrfs_set_backup_fs_root_level(root_backup
,
1912 btrfs_header_level(info
->fs_root
->node
));
1915 btrfs_set_backup_dev_root(root_backup
, info
->dev_root
->node
->start
);
1916 btrfs_set_backup_dev_root_gen(root_backup
,
1917 btrfs_header_generation(info
->dev_root
->node
));
1918 btrfs_set_backup_dev_root_level(root_backup
,
1919 btrfs_header_level(info
->dev_root
->node
));
1921 btrfs_set_backup_csum_root(root_backup
, info
->csum_root
->node
->start
);
1922 btrfs_set_backup_csum_root_gen(root_backup
,
1923 btrfs_header_generation(info
->csum_root
->node
));
1924 btrfs_set_backup_csum_root_level(root_backup
,
1925 btrfs_header_level(info
->csum_root
->node
));
1927 btrfs_set_backup_total_bytes(root_backup
,
1928 btrfs_super_total_bytes(info
->super_copy
));
1929 btrfs_set_backup_bytes_used(root_backup
,
1930 btrfs_super_bytes_used(info
->super_copy
));
1931 btrfs_set_backup_num_devices(root_backup
,
1932 btrfs_super_num_devices(info
->super_copy
));
1935 * if we don't copy this out to the super_copy, it won't get remembered
1936 * for the next commit
1938 memcpy(&info
->super_copy
->super_roots
,
1939 &info
->super_for_commit
->super_roots
,
1940 sizeof(*root_backup
) * BTRFS_NUM_BACKUP_ROOTS
);
1944 * this copies info out of the root backup array and back into
1945 * the in-memory super block. It is meant to help iterate through
1946 * the array, so you send it the number of backups you've already
1947 * tried and the last backup index you used.
1949 * this returns -1 when it has tried all the backups
1951 static noinline
int next_root_backup(struct btrfs_fs_info
*info
,
1952 struct btrfs_super_block
*super
,
1953 int *num_backups_tried
, int *backup_index
)
1955 struct btrfs_root_backup
*root_backup
;
1956 int newest
= *backup_index
;
1958 if (*num_backups_tried
== 0) {
1959 u64 gen
= btrfs_super_generation(super
);
1961 newest
= find_newest_super_backup(info
, gen
);
1965 *backup_index
= newest
;
1966 *num_backups_tried
= 1;
1967 } else if (*num_backups_tried
== BTRFS_NUM_BACKUP_ROOTS
) {
1968 /* we've tried all the backups, all done */
1971 /* jump to the next oldest backup */
1972 newest
= (*backup_index
+ BTRFS_NUM_BACKUP_ROOTS
- 1) %
1973 BTRFS_NUM_BACKUP_ROOTS
;
1974 *backup_index
= newest
;
1975 *num_backups_tried
+= 1;
1977 root_backup
= super
->super_roots
+ newest
;
1979 btrfs_set_super_generation(super
,
1980 btrfs_backup_tree_root_gen(root_backup
));
1981 btrfs_set_super_root(super
, btrfs_backup_tree_root(root_backup
));
1982 btrfs_set_super_root_level(super
,
1983 btrfs_backup_tree_root_level(root_backup
));
1984 btrfs_set_super_bytes_used(super
, btrfs_backup_bytes_used(root_backup
));
1987 * fixme: the total bytes and num_devices need to match or we should
1990 btrfs_set_super_total_bytes(super
, btrfs_backup_total_bytes(root_backup
));
1991 btrfs_set_super_num_devices(super
, btrfs_backup_num_devices(root_backup
));
1995 /* helper to cleanup workers */
1996 static void btrfs_stop_all_workers(struct btrfs_fs_info
*fs_info
)
1998 btrfs_stop_workers(&fs_info
->generic_worker
);
1999 btrfs_stop_workers(&fs_info
->fixup_workers
);
2000 btrfs_stop_workers(&fs_info
->delalloc_workers
);
2001 btrfs_destroy_workqueue(fs_info
->workers
);
2002 btrfs_stop_workers(&fs_info
->endio_workers
);
2003 btrfs_stop_workers(&fs_info
->endio_meta_workers
);
2004 btrfs_stop_workers(&fs_info
->endio_raid56_workers
);
2005 btrfs_stop_workers(&fs_info
->rmw_workers
);
2006 btrfs_stop_workers(&fs_info
->endio_meta_write_workers
);
2007 btrfs_stop_workers(&fs_info
->endio_write_workers
);
2008 btrfs_stop_workers(&fs_info
->endio_freespace_worker
);
2009 btrfs_stop_workers(&fs_info
->submit_workers
);
2010 btrfs_stop_workers(&fs_info
->delayed_workers
);
2011 btrfs_stop_workers(&fs_info
->caching_workers
);
2012 btrfs_stop_workers(&fs_info
->readahead_workers
);
2013 btrfs_stop_workers(&fs_info
->flush_workers
);
2014 btrfs_stop_workers(&fs_info
->qgroup_rescan_workers
);
2017 static void free_root_extent_buffers(struct btrfs_root
*root
)
2020 free_extent_buffer(root
->node
);
2021 free_extent_buffer(root
->commit_root
);
2023 root
->commit_root
= NULL
;
2027 /* helper to cleanup tree roots */
2028 static void free_root_pointers(struct btrfs_fs_info
*info
, int chunk_root
)
2030 free_root_extent_buffers(info
->tree_root
);
2032 free_root_extent_buffers(info
->dev_root
);
2033 free_root_extent_buffers(info
->extent_root
);
2034 free_root_extent_buffers(info
->csum_root
);
2035 free_root_extent_buffers(info
->quota_root
);
2036 free_root_extent_buffers(info
->uuid_root
);
2038 free_root_extent_buffers(info
->chunk_root
);
2041 static void del_fs_roots(struct btrfs_fs_info
*fs_info
)
2044 struct btrfs_root
*gang
[8];
2047 while (!list_empty(&fs_info
->dead_roots
)) {
2048 gang
[0] = list_entry(fs_info
->dead_roots
.next
,
2049 struct btrfs_root
, root_list
);
2050 list_del(&gang
[0]->root_list
);
2052 if (gang
[0]->in_radix
) {
2053 btrfs_drop_and_free_fs_root(fs_info
, gang
[0]);
2055 free_extent_buffer(gang
[0]->node
);
2056 free_extent_buffer(gang
[0]->commit_root
);
2057 btrfs_put_fs_root(gang
[0]);
2062 ret
= radix_tree_gang_lookup(&fs_info
->fs_roots_radix
,
2067 for (i
= 0; i
< ret
; i
++)
2068 btrfs_drop_and_free_fs_root(fs_info
, gang
[i
]);
2071 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
)) {
2072 btrfs_free_log_root_tree(NULL
, fs_info
);
2073 btrfs_destroy_pinned_extent(fs_info
->tree_root
,
2074 fs_info
->pinned_extents
);
2078 int open_ctree(struct super_block
*sb
,
2079 struct btrfs_fs_devices
*fs_devices
,
2089 struct btrfs_key location
;
2090 struct buffer_head
*bh
;
2091 struct btrfs_super_block
*disk_super
;
2092 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
2093 struct btrfs_root
*tree_root
;
2094 struct btrfs_root
*extent_root
;
2095 struct btrfs_root
*csum_root
;
2096 struct btrfs_root
*chunk_root
;
2097 struct btrfs_root
*dev_root
;
2098 struct btrfs_root
*quota_root
;
2099 struct btrfs_root
*uuid_root
;
2100 struct btrfs_root
*log_tree_root
;
2103 int num_backups_tried
= 0;
2104 int backup_index
= 0;
2106 int flags
= WQ_MEM_RECLAIM
| WQ_FREEZABLE
| WQ_UNBOUND
;
2107 bool create_uuid_tree
;
2108 bool check_uuid_tree
;
2110 tree_root
= fs_info
->tree_root
= btrfs_alloc_root(fs_info
);
2111 chunk_root
= fs_info
->chunk_root
= btrfs_alloc_root(fs_info
);
2112 if (!tree_root
|| !chunk_root
) {
2117 ret
= init_srcu_struct(&fs_info
->subvol_srcu
);
2123 ret
= setup_bdi(fs_info
, &fs_info
->bdi
);
2129 ret
= percpu_counter_init(&fs_info
->dirty_metadata_bytes
, 0);
2134 fs_info
->dirty_metadata_batch
= PAGE_CACHE_SIZE
*
2135 (1 + ilog2(nr_cpu_ids
));
2137 ret
= percpu_counter_init(&fs_info
->delalloc_bytes
, 0);
2140 goto fail_dirty_metadata_bytes
;
2143 ret
= percpu_counter_init(&fs_info
->bio_counter
, 0);
2146 goto fail_delalloc_bytes
;
2149 fs_info
->btree_inode
= new_inode(sb
);
2150 if (!fs_info
->btree_inode
) {
2152 goto fail_bio_counter
;
2155 mapping_set_gfp_mask(fs_info
->btree_inode
->i_mapping
, GFP_NOFS
);
2157 INIT_RADIX_TREE(&fs_info
->fs_roots_radix
, GFP_ATOMIC
);
2158 INIT_RADIX_TREE(&fs_info
->buffer_radix
, GFP_ATOMIC
);
2159 INIT_LIST_HEAD(&fs_info
->trans_list
);
2160 INIT_LIST_HEAD(&fs_info
->dead_roots
);
2161 INIT_LIST_HEAD(&fs_info
->delayed_iputs
);
2162 INIT_LIST_HEAD(&fs_info
->delalloc_roots
);
2163 INIT_LIST_HEAD(&fs_info
->caching_block_groups
);
2164 spin_lock_init(&fs_info
->delalloc_root_lock
);
2165 spin_lock_init(&fs_info
->trans_lock
);
2166 spin_lock_init(&fs_info
->fs_roots_radix_lock
);
2167 spin_lock_init(&fs_info
->delayed_iput_lock
);
2168 spin_lock_init(&fs_info
->defrag_inodes_lock
);
2169 spin_lock_init(&fs_info
->free_chunk_lock
);
2170 spin_lock_init(&fs_info
->tree_mod_seq_lock
);
2171 spin_lock_init(&fs_info
->super_lock
);
2172 spin_lock_init(&fs_info
->buffer_lock
);
2173 rwlock_init(&fs_info
->tree_mod_log_lock
);
2174 mutex_init(&fs_info
->reloc_mutex
);
2175 seqlock_init(&fs_info
->profiles_lock
);
2177 init_completion(&fs_info
->kobj_unregister
);
2178 INIT_LIST_HEAD(&fs_info
->dirty_cowonly_roots
);
2179 INIT_LIST_HEAD(&fs_info
->space_info
);
2180 INIT_LIST_HEAD(&fs_info
->tree_mod_seq_list
);
2181 btrfs_mapping_init(&fs_info
->mapping_tree
);
2182 btrfs_init_block_rsv(&fs_info
->global_block_rsv
,
2183 BTRFS_BLOCK_RSV_GLOBAL
);
2184 btrfs_init_block_rsv(&fs_info
->delalloc_block_rsv
,
2185 BTRFS_BLOCK_RSV_DELALLOC
);
2186 btrfs_init_block_rsv(&fs_info
->trans_block_rsv
, BTRFS_BLOCK_RSV_TRANS
);
2187 btrfs_init_block_rsv(&fs_info
->chunk_block_rsv
, BTRFS_BLOCK_RSV_CHUNK
);
2188 btrfs_init_block_rsv(&fs_info
->empty_block_rsv
, BTRFS_BLOCK_RSV_EMPTY
);
2189 btrfs_init_block_rsv(&fs_info
->delayed_block_rsv
,
2190 BTRFS_BLOCK_RSV_DELOPS
);
2191 atomic_set(&fs_info
->nr_async_submits
, 0);
2192 atomic_set(&fs_info
->async_delalloc_pages
, 0);
2193 atomic_set(&fs_info
->async_submit_draining
, 0);
2194 atomic_set(&fs_info
->nr_async_bios
, 0);
2195 atomic_set(&fs_info
->defrag_running
, 0);
2196 atomic64_set(&fs_info
->tree_mod_seq
, 0);
2198 fs_info
->max_inline
= 8192 * 1024;
2199 fs_info
->metadata_ratio
= 0;
2200 fs_info
->defrag_inodes
= RB_ROOT
;
2201 fs_info
->free_chunk_space
= 0;
2202 fs_info
->tree_mod_log
= RB_ROOT
;
2203 fs_info
->commit_interval
= BTRFS_DEFAULT_COMMIT_INTERVAL
;
2204 fs_info
->avg_delayed_ref_runtime
= div64_u64(NSEC_PER_SEC
, 64);
2205 /* readahead state */
2206 INIT_RADIX_TREE(&fs_info
->reada_tree
, GFP_NOFS
& ~__GFP_WAIT
);
2207 spin_lock_init(&fs_info
->reada_lock
);
2209 fs_info
->thread_pool_size
= min_t(unsigned long,
2210 num_online_cpus() + 2, 8);
2212 INIT_LIST_HEAD(&fs_info
->ordered_roots
);
2213 spin_lock_init(&fs_info
->ordered_root_lock
);
2214 fs_info
->delayed_root
= kmalloc(sizeof(struct btrfs_delayed_root
),
2216 if (!fs_info
->delayed_root
) {
2220 btrfs_init_delayed_root(fs_info
->delayed_root
);
2222 mutex_init(&fs_info
->scrub_lock
);
2223 atomic_set(&fs_info
->scrubs_running
, 0);
2224 atomic_set(&fs_info
->scrub_pause_req
, 0);
2225 atomic_set(&fs_info
->scrubs_paused
, 0);
2226 atomic_set(&fs_info
->scrub_cancel_req
, 0);
2227 init_waitqueue_head(&fs_info
->replace_wait
);
2228 init_waitqueue_head(&fs_info
->scrub_pause_wait
);
2229 fs_info
->scrub_workers_refcnt
= 0;
2230 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2231 fs_info
->check_integrity_print_mask
= 0;
2234 spin_lock_init(&fs_info
->balance_lock
);
2235 mutex_init(&fs_info
->balance_mutex
);
2236 atomic_set(&fs_info
->balance_running
, 0);
2237 atomic_set(&fs_info
->balance_pause_req
, 0);
2238 atomic_set(&fs_info
->balance_cancel_req
, 0);
2239 fs_info
->balance_ctl
= NULL
;
2240 init_waitqueue_head(&fs_info
->balance_wait_q
);
2242 sb
->s_blocksize
= 4096;
2243 sb
->s_blocksize_bits
= blksize_bits(4096);
2244 sb
->s_bdi
= &fs_info
->bdi
;
2246 fs_info
->btree_inode
->i_ino
= BTRFS_BTREE_INODE_OBJECTID
;
2247 set_nlink(fs_info
->btree_inode
, 1);
2249 * we set the i_size on the btree inode to the max possible int.
2250 * the real end of the address space is determined by all of
2251 * the devices in the system
2253 fs_info
->btree_inode
->i_size
= OFFSET_MAX
;
2254 fs_info
->btree_inode
->i_mapping
->a_ops
= &btree_aops
;
2255 fs_info
->btree_inode
->i_mapping
->backing_dev_info
= &fs_info
->bdi
;
2257 RB_CLEAR_NODE(&BTRFS_I(fs_info
->btree_inode
)->rb_node
);
2258 extent_io_tree_init(&BTRFS_I(fs_info
->btree_inode
)->io_tree
,
2259 fs_info
->btree_inode
->i_mapping
);
2260 BTRFS_I(fs_info
->btree_inode
)->io_tree
.track_uptodate
= 0;
2261 extent_map_tree_init(&BTRFS_I(fs_info
->btree_inode
)->extent_tree
);
2263 BTRFS_I(fs_info
->btree_inode
)->io_tree
.ops
= &btree_extent_io_ops
;
2265 BTRFS_I(fs_info
->btree_inode
)->root
= tree_root
;
2266 memset(&BTRFS_I(fs_info
->btree_inode
)->location
, 0,
2267 sizeof(struct btrfs_key
));
2268 set_bit(BTRFS_INODE_DUMMY
,
2269 &BTRFS_I(fs_info
->btree_inode
)->runtime_flags
);
2270 btrfs_insert_inode_hash(fs_info
->btree_inode
);
2272 spin_lock_init(&fs_info
->block_group_cache_lock
);
2273 fs_info
->block_group_cache_tree
= RB_ROOT
;
2274 fs_info
->first_logical_byte
= (u64
)-1;
2276 extent_io_tree_init(&fs_info
->freed_extents
[0],
2277 fs_info
->btree_inode
->i_mapping
);
2278 extent_io_tree_init(&fs_info
->freed_extents
[1],
2279 fs_info
->btree_inode
->i_mapping
);
2280 fs_info
->pinned_extents
= &fs_info
->freed_extents
[0];
2281 fs_info
->do_barriers
= 1;
2284 mutex_init(&fs_info
->ordered_operations_mutex
);
2285 mutex_init(&fs_info
->ordered_extent_flush_mutex
);
2286 mutex_init(&fs_info
->tree_log_mutex
);
2287 mutex_init(&fs_info
->chunk_mutex
);
2288 mutex_init(&fs_info
->transaction_kthread_mutex
);
2289 mutex_init(&fs_info
->cleaner_mutex
);
2290 mutex_init(&fs_info
->volume_mutex
);
2291 init_rwsem(&fs_info
->extent_commit_sem
);
2292 init_rwsem(&fs_info
->cleanup_work_sem
);
2293 init_rwsem(&fs_info
->subvol_sem
);
2294 sema_init(&fs_info
->uuid_tree_rescan_sem
, 1);
2295 fs_info
->dev_replace
.lock_owner
= 0;
2296 atomic_set(&fs_info
->dev_replace
.nesting_level
, 0);
2297 mutex_init(&fs_info
->dev_replace
.lock_finishing_cancel_unmount
);
2298 mutex_init(&fs_info
->dev_replace
.lock_management_lock
);
2299 mutex_init(&fs_info
->dev_replace
.lock
);
2301 spin_lock_init(&fs_info
->qgroup_lock
);
2302 mutex_init(&fs_info
->qgroup_ioctl_lock
);
2303 fs_info
->qgroup_tree
= RB_ROOT
;
2304 INIT_LIST_HEAD(&fs_info
->dirty_qgroups
);
2305 fs_info
->qgroup_seq
= 1;
2306 fs_info
->quota_enabled
= 0;
2307 fs_info
->pending_quota_state
= 0;
2308 fs_info
->qgroup_ulist
= NULL
;
2309 mutex_init(&fs_info
->qgroup_rescan_lock
);
2311 btrfs_init_free_cluster(&fs_info
->meta_alloc_cluster
);
2312 btrfs_init_free_cluster(&fs_info
->data_alloc_cluster
);
2314 init_waitqueue_head(&fs_info
->transaction_throttle
);
2315 init_waitqueue_head(&fs_info
->transaction_wait
);
2316 init_waitqueue_head(&fs_info
->transaction_blocked_wait
);
2317 init_waitqueue_head(&fs_info
->async_submit_wait
);
2319 ret
= btrfs_alloc_stripe_hash_table(fs_info
);
2325 __setup_root(4096, 4096, 4096, 4096, tree_root
,
2326 fs_info
, BTRFS_ROOT_TREE_OBJECTID
);
2328 invalidate_bdev(fs_devices
->latest_bdev
);
2331 * Read super block and check the signature bytes only
2333 bh
= btrfs_read_dev_super(fs_devices
->latest_bdev
);
2340 * We want to check superblock checksum, the type is stored inside.
2341 * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
2343 if (btrfs_check_super_csum(bh
->b_data
)) {
2344 printk(KERN_ERR
"BTRFS: superblock checksum mismatch\n");
2350 * super_copy is zeroed at allocation time and we never touch the
2351 * following bytes up to INFO_SIZE, the checksum is calculated from
2352 * the whole block of INFO_SIZE
2354 memcpy(fs_info
->super_copy
, bh
->b_data
, sizeof(*fs_info
->super_copy
));
2355 memcpy(fs_info
->super_for_commit
, fs_info
->super_copy
,
2356 sizeof(*fs_info
->super_for_commit
));
2359 memcpy(fs_info
->fsid
, fs_info
->super_copy
->fsid
, BTRFS_FSID_SIZE
);
2361 ret
= btrfs_check_super_valid(fs_info
, sb
->s_flags
& MS_RDONLY
);
2363 printk(KERN_ERR
"BTRFS: superblock contains fatal errors\n");
2368 disk_super
= fs_info
->super_copy
;
2369 if (!btrfs_super_root(disk_super
))
2372 /* check FS state, whether FS is broken. */
2373 if (btrfs_super_flags(disk_super
) & BTRFS_SUPER_FLAG_ERROR
)
2374 set_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
);
2377 * run through our array of backup supers and setup
2378 * our ring pointer to the oldest one
2380 generation
= btrfs_super_generation(disk_super
);
2381 find_oldest_super_backup(fs_info
, generation
);
2384 * In the long term, we'll store the compression type in the super
2385 * block, and it'll be used for per file compression control.
2387 fs_info
->compress_type
= BTRFS_COMPRESS_ZLIB
;
2389 ret
= btrfs_parse_options(tree_root
, options
);
2395 features
= btrfs_super_incompat_flags(disk_super
) &
2396 ~BTRFS_FEATURE_INCOMPAT_SUPP
;
2398 printk(KERN_ERR
"BTRFS: couldn't mount because of "
2399 "unsupported optional features (%Lx).\n",
2405 if (btrfs_super_leafsize(disk_super
) !=
2406 btrfs_super_nodesize(disk_super
)) {
2407 printk(KERN_ERR
"BTRFS: couldn't mount because metadata "
2408 "blocksizes don't match. node %d leaf %d\n",
2409 btrfs_super_nodesize(disk_super
),
2410 btrfs_super_leafsize(disk_super
));
2414 if (btrfs_super_leafsize(disk_super
) > BTRFS_MAX_METADATA_BLOCKSIZE
) {
2415 printk(KERN_ERR
"BTRFS: couldn't mount because metadata "
2416 "blocksize (%d) was too large\n",
2417 btrfs_super_leafsize(disk_super
));
2422 features
= btrfs_super_incompat_flags(disk_super
);
2423 features
|= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
;
2424 if (tree_root
->fs_info
->compress_type
== BTRFS_COMPRESS_LZO
)
2425 features
|= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO
;
2427 if (features
& BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA
)
2428 printk(KERN_ERR
"BTRFS: has skinny extents\n");
2431 * flag our filesystem as having big metadata blocks if
2432 * they are bigger than the page size
2434 if (btrfs_super_leafsize(disk_super
) > PAGE_CACHE_SIZE
) {
2435 if (!(features
& BTRFS_FEATURE_INCOMPAT_BIG_METADATA
))
2436 printk(KERN_INFO
"BTRFS: flagging fs with big metadata feature\n");
2437 features
|= BTRFS_FEATURE_INCOMPAT_BIG_METADATA
;
2440 nodesize
= btrfs_super_nodesize(disk_super
);
2441 leafsize
= btrfs_super_leafsize(disk_super
);
2442 sectorsize
= btrfs_super_sectorsize(disk_super
);
2443 stripesize
= btrfs_super_stripesize(disk_super
);
2444 fs_info
->dirty_metadata_batch
= leafsize
* (1 + ilog2(nr_cpu_ids
));
2445 fs_info
->delalloc_batch
= sectorsize
* 512 * (1 + ilog2(nr_cpu_ids
));
2448 * mixed block groups end up with duplicate but slightly offset
2449 * extent buffers for the same range. It leads to corruptions
2451 if ((features
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
) &&
2452 (sectorsize
!= leafsize
)) {
2453 printk(KERN_WARNING
"BTRFS: unequal leaf/node/sector sizes "
2454 "are not allowed for mixed block groups on %s\n",
2460 * Needn't use the lock because there is no other task which will
2463 btrfs_set_super_incompat_flags(disk_super
, features
);
2465 features
= btrfs_super_compat_ro_flags(disk_super
) &
2466 ~BTRFS_FEATURE_COMPAT_RO_SUPP
;
2467 if (!(sb
->s_flags
& MS_RDONLY
) && features
) {
2468 printk(KERN_ERR
"BTRFS: couldn't mount RDWR because of "
2469 "unsupported option features (%Lx).\n",
2475 max_active
= fs_info
->thread_pool_size
;
2476 btrfs_init_workers(&fs_info
->generic_worker
,
2477 "genwork", 1, NULL
);
2480 btrfs_alloc_workqueue("worker", flags
| WQ_HIGHPRI
,
2483 btrfs_init_workers(&fs_info
->delalloc_workers
, "delalloc",
2484 fs_info
->thread_pool_size
, NULL
);
2486 btrfs_init_workers(&fs_info
->flush_workers
, "flush_delalloc",
2487 fs_info
->thread_pool_size
, NULL
);
2489 btrfs_init_workers(&fs_info
->submit_workers
, "submit",
2490 min_t(u64
, fs_devices
->num_devices
,
2491 fs_info
->thread_pool_size
), NULL
);
2493 btrfs_init_workers(&fs_info
->caching_workers
, "cache",
2494 fs_info
->thread_pool_size
, NULL
);
2496 /* a higher idle thresh on the submit workers makes it much more
2497 * likely that bios will be send down in a sane order to the
2500 fs_info
->submit_workers
.idle_thresh
= 64;
2502 fs_info
->delalloc_workers
.idle_thresh
= 2;
2503 fs_info
->delalloc_workers
.ordered
= 1;
2505 btrfs_init_workers(&fs_info
->fixup_workers
, "fixup", 1,
2506 &fs_info
->generic_worker
);
2507 btrfs_init_workers(&fs_info
->endio_workers
, "endio",
2508 fs_info
->thread_pool_size
,
2509 &fs_info
->generic_worker
);
2510 btrfs_init_workers(&fs_info
->endio_meta_workers
, "endio-meta",
2511 fs_info
->thread_pool_size
,
2512 &fs_info
->generic_worker
);
2513 btrfs_init_workers(&fs_info
->endio_meta_write_workers
,
2514 "endio-meta-write", fs_info
->thread_pool_size
,
2515 &fs_info
->generic_worker
);
2516 btrfs_init_workers(&fs_info
->endio_raid56_workers
,
2517 "endio-raid56", fs_info
->thread_pool_size
,
2518 &fs_info
->generic_worker
);
2519 btrfs_init_workers(&fs_info
->rmw_workers
,
2520 "rmw", fs_info
->thread_pool_size
,
2521 &fs_info
->generic_worker
);
2522 btrfs_init_workers(&fs_info
->endio_write_workers
, "endio-write",
2523 fs_info
->thread_pool_size
,
2524 &fs_info
->generic_worker
);
2525 btrfs_init_workers(&fs_info
->endio_freespace_worker
, "freespace-write",
2526 1, &fs_info
->generic_worker
);
2527 btrfs_init_workers(&fs_info
->delayed_workers
, "delayed-meta",
2528 fs_info
->thread_pool_size
,
2529 &fs_info
->generic_worker
);
2530 btrfs_init_workers(&fs_info
->readahead_workers
, "readahead",
2531 fs_info
->thread_pool_size
,
2532 &fs_info
->generic_worker
);
2533 btrfs_init_workers(&fs_info
->qgroup_rescan_workers
, "qgroup-rescan", 1,
2534 &fs_info
->generic_worker
);
2537 * endios are largely parallel and should have a very
2540 fs_info
->endio_workers
.idle_thresh
= 4;
2541 fs_info
->endio_meta_workers
.idle_thresh
= 4;
2542 fs_info
->endio_raid56_workers
.idle_thresh
= 4;
2543 fs_info
->rmw_workers
.idle_thresh
= 2;
2545 fs_info
->endio_write_workers
.idle_thresh
= 2;
2546 fs_info
->endio_meta_write_workers
.idle_thresh
= 2;
2547 fs_info
->readahead_workers
.idle_thresh
= 2;
2550 * btrfs_start_workers can really only fail because of ENOMEM so just
2551 * return -ENOMEM if any of these fail.
2553 ret
= btrfs_start_workers(&fs_info
->generic_worker
);
2554 ret
|= btrfs_start_workers(&fs_info
->submit_workers
);
2555 ret
|= btrfs_start_workers(&fs_info
->delalloc_workers
);
2556 ret
|= btrfs_start_workers(&fs_info
->fixup_workers
);
2557 ret
|= btrfs_start_workers(&fs_info
->endio_workers
);
2558 ret
|= btrfs_start_workers(&fs_info
->endio_meta_workers
);
2559 ret
|= btrfs_start_workers(&fs_info
->rmw_workers
);
2560 ret
|= btrfs_start_workers(&fs_info
->endio_raid56_workers
);
2561 ret
|= btrfs_start_workers(&fs_info
->endio_meta_write_workers
);
2562 ret
|= btrfs_start_workers(&fs_info
->endio_write_workers
);
2563 ret
|= btrfs_start_workers(&fs_info
->endio_freespace_worker
);
2564 ret
|= btrfs_start_workers(&fs_info
->delayed_workers
);
2565 ret
|= btrfs_start_workers(&fs_info
->caching_workers
);
2566 ret
|= btrfs_start_workers(&fs_info
->readahead_workers
);
2567 ret
|= btrfs_start_workers(&fs_info
->flush_workers
);
2568 ret
|= btrfs_start_workers(&fs_info
->qgroup_rescan_workers
);
2571 goto fail_sb_buffer
;
2573 if (!(fs_info
->workers
)) {
2575 goto fail_sb_buffer
;
2578 fs_info
->bdi
.ra_pages
*= btrfs_super_num_devices(disk_super
);
2579 fs_info
->bdi
.ra_pages
= max(fs_info
->bdi
.ra_pages
,
2580 4 * 1024 * 1024 / PAGE_CACHE_SIZE
);
2582 tree_root
->nodesize
= nodesize
;
2583 tree_root
->leafsize
= leafsize
;
2584 tree_root
->sectorsize
= sectorsize
;
2585 tree_root
->stripesize
= stripesize
;
2587 sb
->s_blocksize
= sectorsize
;
2588 sb
->s_blocksize_bits
= blksize_bits(sectorsize
);
2590 if (btrfs_super_magic(disk_super
) != BTRFS_MAGIC
) {
2591 printk(KERN_INFO
"BTRFS: valid FS not found on %s\n", sb
->s_id
);
2592 goto fail_sb_buffer
;
2595 if (sectorsize
!= PAGE_SIZE
) {
2596 printk(KERN_WARNING
"BTRFS: Incompatible sector size(%lu) "
2597 "found on %s\n", (unsigned long)sectorsize
, sb
->s_id
);
2598 goto fail_sb_buffer
;
2601 mutex_lock(&fs_info
->chunk_mutex
);
2602 ret
= btrfs_read_sys_array(tree_root
);
2603 mutex_unlock(&fs_info
->chunk_mutex
);
2605 printk(KERN_WARNING
"BTRFS: failed to read the system "
2606 "array on %s\n", sb
->s_id
);
2607 goto fail_sb_buffer
;
2610 blocksize
= btrfs_level_size(tree_root
,
2611 btrfs_super_chunk_root_level(disk_super
));
2612 generation
= btrfs_super_chunk_root_generation(disk_super
);
2614 __setup_root(nodesize
, leafsize
, sectorsize
, stripesize
,
2615 chunk_root
, fs_info
, BTRFS_CHUNK_TREE_OBJECTID
);
2617 chunk_root
->node
= read_tree_block(chunk_root
,
2618 btrfs_super_chunk_root(disk_super
),
2619 blocksize
, generation
);
2620 if (!chunk_root
->node
||
2621 !test_bit(EXTENT_BUFFER_UPTODATE
, &chunk_root
->node
->bflags
)) {
2622 printk(KERN_WARNING
"BTRFS: failed to read chunk root on %s\n",
2624 goto fail_tree_roots
;
2626 btrfs_set_root_node(&chunk_root
->root_item
, chunk_root
->node
);
2627 chunk_root
->commit_root
= btrfs_root_node(chunk_root
);
2629 read_extent_buffer(chunk_root
->node
, fs_info
->chunk_tree_uuid
,
2630 btrfs_header_chunk_tree_uuid(chunk_root
->node
), BTRFS_UUID_SIZE
);
2632 ret
= btrfs_read_chunk_tree(chunk_root
);
2634 printk(KERN_WARNING
"BTRFS: failed to read chunk tree on %s\n",
2636 goto fail_tree_roots
;
2640 * keep the device that is marked to be the target device for the
2641 * dev_replace procedure
2643 btrfs_close_extra_devices(fs_info
, fs_devices
, 0);
2645 if (!fs_devices
->latest_bdev
) {
2646 printk(KERN_CRIT
"BTRFS: failed to read devices on %s\n",
2648 goto fail_tree_roots
;
2652 blocksize
= btrfs_level_size(tree_root
,
2653 btrfs_super_root_level(disk_super
));
2654 generation
= btrfs_super_generation(disk_super
);
2656 tree_root
->node
= read_tree_block(tree_root
,
2657 btrfs_super_root(disk_super
),
2658 blocksize
, generation
);
2659 if (!tree_root
->node
||
2660 !test_bit(EXTENT_BUFFER_UPTODATE
, &tree_root
->node
->bflags
)) {
2661 printk(KERN_WARNING
"BTRFS: failed to read tree root on %s\n",
2664 goto recovery_tree_root
;
2667 btrfs_set_root_node(&tree_root
->root_item
, tree_root
->node
);
2668 tree_root
->commit_root
= btrfs_root_node(tree_root
);
2669 btrfs_set_root_refs(&tree_root
->root_item
, 1);
2671 location
.objectid
= BTRFS_EXTENT_TREE_OBJECTID
;
2672 location
.type
= BTRFS_ROOT_ITEM_KEY
;
2673 location
.offset
= 0;
2675 extent_root
= btrfs_read_tree_root(tree_root
, &location
);
2676 if (IS_ERR(extent_root
)) {
2677 ret
= PTR_ERR(extent_root
);
2678 goto recovery_tree_root
;
2680 extent_root
->track_dirty
= 1;
2681 fs_info
->extent_root
= extent_root
;
2683 location
.objectid
= BTRFS_DEV_TREE_OBJECTID
;
2684 dev_root
= btrfs_read_tree_root(tree_root
, &location
);
2685 if (IS_ERR(dev_root
)) {
2686 ret
= PTR_ERR(dev_root
);
2687 goto recovery_tree_root
;
2689 dev_root
->track_dirty
= 1;
2690 fs_info
->dev_root
= dev_root
;
2691 btrfs_init_devices_late(fs_info
);
2693 location
.objectid
= BTRFS_CSUM_TREE_OBJECTID
;
2694 csum_root
= btrfs_read_tree_root(tree_root
, &location
);
2695 if (IS_ERR(csum_root
)) {
2696 ret
= PTR_ERR(csum_root
);
2697 goto recovery_tree_root
;
2699 csum_root
->track_dirty
= 1;
2700 fs_info
->csum_root
= csum_root
;
2702 location
.objectid
= BTRFS_QUOTA_TREE_OBJECTID
;
2703 quota_root
= btrfs_read_tree_root(tree_root
, &location
);
2704 if (!IS_ERR(quota_root
)) {
2705 quota_root
->track_dirty
= 1;
2706 fs_info
->quota_enabled
= 1;
2707 fs_info
->pending_quota_state
= 1;
2708 fs_info
->quota_root
= quota_root
;
2711 location
.objectid
= BTRFS_UUID_TREE_OBJECTID
;
2712 uuid_root
= btrfs_read_tree_root(tree_root
, &location
);
2713 if (IS_ERR(uuid_root
)) {
2714 ret
= PTR_ERR(uuid_root
);
2716 goto recovery_tree_root
;
2717 create_uuid_tree
= true;
2718 check_uuid_tree
= false;
2720 uuid_root
->track_dirty
= 1;
2721 fs_info
->uuid_root
= uuid_root
;
2722 create_uuid_tree
= false;
2724 generation
!= btrfs_super_uuid_tree_generation(disk_super
);
2727 fs_info
->generation
= generation
;
2728 fs_info
->last_trans_committed
= generation
;
2730 ret
= btrfs_recover_balance(fs_info
);
2732 printk(KERN_WARNING
"BTRFS: failed to recover balance\n");
2733 goto fail_block_groups
;
2736 ret
= btrfs_init_dev_stats(fs_info
);
2738 printk(KERN_ERR
"BTRFS: failed to init dev_stats: %d\n",
2740 goto fail_block_groups
;
2743 ret
= btrfs_init_dev_replace(fs_info
);
2745 pr_err("BTRFS: failed to init dev_replace: %d\n", ret
);
2746 goto fail_block_groups
;
2749 btrfs_close_extra_devices(fs_info
, fs_devices
, 1);
2751 ret
= btrfs_sysfs_add_one(fs_info
);
2753 pr_err("BTRFS: failed to init sysfs interface: %d\n", ret
);
2754 goto fail_block_groups
;
2757 ret
= btrfs_init_space_info(fs_info
);
2759 printk(KERN_ERR
"BTRFS: Failed to initial space info: %d\n", ret
);
2763 ret
= btrfs_read_block_groups(extent_root
);
2765 printk(KERN_ERR
"BTRFS: Failed to read block groups: %d\n", ret
);
2768 fs_info
->num_tolerated_disk_barrier_failures
=
2769 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info
);
2770 if (fs_info
->fs_devices
->missing_devices
>
2771 fs_info
->num_tolerated_disk_barrier_failures
&&
2772 !(sb
->s_flags
& MS_RDONLY
)) {
2773 printk(KERN_WARNING
"BTRFS: "
2774 "too many missing devices, writeable mount is not allowed\n");
2778 fs_info
->cleaner_kthread
= kthread_run(cleaner_kthread
, tree_root
,
2780 if (IS_ERR(fs_info
->cleaner_kthread
))
2783 fs_info
->transaction_kthread
= kthread_run(transaction_kthread
,
2785 "btrfs-transaction");
2786 if (IS_ERR(fs_info
->transaction_kthread
))
2789 if (!btrfs_test_opt(tree_root
, SSD
) &&
2790 !btrfs_test_opt(tree_root
, NOSSD
) &&
2791 !fs_info
->fs_devices
->rotating
) {
2792 printk(KERN_INFO
"BTRFS: detected SSD devices, enabling SSD "
2794 btrfs_set_opt(fs_info
->mount_opt
, SSD
);
2797 /* Set the real inode map cache flag */
2798 if (btrfs_test_opt(tree_root
, CHANGE_INODE_CACHE
))
2799 btrfs_set_opt(tree_root
->fs_info
->mount_opt
, INODE_MAP_CACHE
);
2801 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2802 if (btrfs_test_opt(tree_root
, CHECK_INTEGRITY
)) {
2803 ret
= btrfsic_mount(tree_root
, fs_devices
,
2804 btrfs_test_opt(tree_root
,
2805 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA
) ?
2807 fs_info
->check_integrity_print_mask
);
2809 printk(KERN_WARNING
"BTRFS: failed to initialize"
2810 " integrity check module %s\n", sb
->s_id
);
2813 ret
= btrfs_read_qgroup_config(fs_info
);
2815 goto fail_trans_kthread
;
2817 /* do not make disk changes in broken FS */
2818 if (btrfs_super_log_root(disk_super
) != 0) {
2819 u64 bytenr
= btrfs_super_log_root(disk_super
);
2821 if (fs_devices
->rw_devices
== 0) {
2822 printk(KERN_WARNING
"BTRFS: log replay required "
2828 btrfs_level_size(tree_root
,
2829 btrfs_super_log_root_level(disk_super
));
2831 log_tree_root
= btrfs_alloc_root(fs_info
);
2832 if (!log_tree_root
) {
2837 __setup_root(nodesize
, leafsize
, sectorsize
, stripesize
,
2838 log_tree_root
, fs_info
, BTRFS_TREE_LOG_OBJECTID
);
2840 log_tree_root
->node
= read_tree_block(tree_root
, bytenr
,
2843 if (!log_tree_root
->node
||
2844 !extent_buffer_uptodate(log_tree_root
->node
)) {
2845 printk(KERN_ERR
"BTRFS: failed to read log tree\n");
2846 free_extent_buffer(log_tree_root
->node
);
2847 kfree(log_tree_root
);
2848 goto fail_trans_kthread
;
2850 /* returns with log_tree_root freed on success */
2851 ret
= btrfs_recover_log_trees(log_tree_root
);
2853 btrfs_error(tree_root
->fs_info
, ret
,
2854 "Failed to recover log tree");
2855 free_extent_buffer(log_tree_root
->node
);
2856 kfree(log_tree_root
);
2857 goto fail_trans_kthread
;
2860 if (sb
->s_flags
& MS_RDONLY
) {
2861 ret
= btrfs_commit_super(tree_root
);
2863 goto fail_trans_kthread
;
2867 ret
= btrfs_find_orphan_roots(tree_root
);
2869 goto fail_trans_kthread
;
2871 if (!(sb
->s_flags
& MS_RDONLY
)) {
2872 ret
= btrfs_cleanup_fs_roots(fs_info
);
2874 goto fail_trans_kthread
;
2876 ret
= btrfs_recover_relocation(tree_root
);
2879 "BTRFS: failed to recover relocation\n");
2885 location
.objectid
= BTRFS_FS_TREE_OBJECTID
;
2886 location
.type
= BTRFS_ROOT_ITEM_KEY
;
2887 location
.offset
= 0;
2889 fs_info
->fs_root
= btrfs_read_fs_root_no_name(fs_info
, &location
);
2890 if (IS_ERR(fs_info
->fs_root
)) {
2891 err
= PTR_ERR(fs_info
->fs_root
);
2895 if (sb
->s_flags
& MS_RDONLY
)
2898 down_read(&fs_info
->cleanup_work_sem
);
2899 if ((ret
= btrfs_orphan_cleanup(fs_info
->fs_root
)) ||
2900 (ret
= btrfs_orphan_cleanup(fs_info
->tree_root
))) {
2901 up_read(&fs_info
->cleanup_work_sem
);
2902 close_ctree(tree_root
);
2905 up_read(&fs_info
->cleanup_work_sem
);
2907 ret
= btrfs_resume_balance_async(fs_info
);
2909 printk(KERN_WARNING
"BTRFS: failed to resume balance\n");
2910 close_ctree(tree_root
);
2914 ret
= btrfs_resume_dev_replace_async(fs_info
);
2916 pr_warn("BTRFS: failed to resume dev_replace\n");
2917 close_ctree(tree_root
);
2921 btrfs_qgroup_rescan_resume(fs_info
);
2923 if (create_uuid_tree
) {
2924 pr_info("BTRFS: creating UUID tree\n");
2925 ret
= btrfs_create_uuid_tree(fs_info
);
2927 pr_warn("BTRFS: failed to create the UUID tree %d\n",
2929 close_ctree(tree_root
);
2932 } else if (check_uuid_tree
||
2933 btrfs_test_opt(tree_root
, RESCAN_UUID_TREE
)) {
2934 pr_info("BTRFS: checking UUID tree\n");
2935 ret
= btrfs_check_uuid_tree(fs_info
);
2937 pr_warn("BTRFS: failed to check the UUID tree %d\n",
2939 close_ctree(tree_root
);
2943 fs_info
->update_uuid_tree_gen
= 1;
2949 btrfs_free_qgroup_config(fs_info
);
2951 kthread_stop(fs_info
->transaction_kthread
);
2952 btrfs_cleanup_transaction(fs_info
->tree_root
);
2953 del_fs_roots(fs_info
);
2955 kthread_stop(fs_info
->cleaner_kthread
);
2958 * make sure we're done with the btree inode before we stop our
2961 filemap_write_and_wait(fs_info
->btree_inode
->i_mapping
);
2964 btrfs_sysfs_remove_one(fs_info
);
2967 btrfs_put_block_group_cache(fs_info
);
2968 btrfs_free_block_groups(fs_info
);
2971 free_root_pointers(fs_info
, 1);
2972 invalidate_inode_pages2(fs_info
->btree_inode
->i_mapping
);
2975 btrfs_stop_all_workers(fs_info
);
2978 btrfs_mapping_tree_free(&fs_info
->mapping_tree
);
2980 iput(fs_info
->btree_inode
);
2982 percpu_counter_destroy(&fs_info
->bio_counter
);
2983 fail_delalloc_bytes
:
2984 percpu_counter_destroy(&fs_info
->delalloc_bytes
);
2985 fail_dirty_metadata_bytes
:
2986 percpu_counter_destroy(&fs_info
->dirty_metadata_bytes
);
2988 bdi_destroy(&fs_info
->bdi
);
2990 cleanup_srcu_struct(&fs_info
->subvol_srcu
);
2992 btrfs_free_stripe_hash_table(fs_info
);
2993 btrfs_close_devices(fs_info
->fs_devices
);
2997 if (!btrfs_test_opt(tree_root
, RECOVERY
))
2998 goto fail_tree_roots
;
3000 free_root_pointers(fs_info
, 0);
3002 /* don't use the log in recovery mode, it won't be valid */
3003 btrfs_set_super_log_root(disk_super
, 0);
3005 /* we can't trust the free space cache either */
3006 btrfs_set_opt(fs_info
->mount_opt
, CLEAR_CACHE
);
3008 ret
= next_root_backup(fs_info
, fs_info
->super_copy
,
3009 &num_backups_tried
, &backup_index
);
3011 goto fail_block_groups
;
3012 goto retry_root_backup
;
3015 static void btrfs_end_buffer_write_sync(struct buffer_head
*bh
, int uptodate
)
3018 set_buffer_uptodate(bh
);
3020 struct btrfs_device
*device
= (struct btrfs_device
*)
3023 printk_ratelimited_in_rcu(KERN_WARNING
"BTRFS: lost page write due to "
3024 "I/O error on %s\n",
3025 rcu_str_deref(device
->name
));
3026 /* note, we dont' set_buffer_write_io_error because we have
3027 * our own ways of dealing with the IO errors
3029 clear_buffer_uptodate(bh
);
3030 btrfs_dev_stat_inc_and_print(device
, BTRFS_DEV_STAT_WRITE_ERRS
);
3036 struct buffer_head
*btrfs_read_dev_super(struct block_device
*bdev
)
3038 struct buffer_head
*bh
;
3039 struct buffer_head
*latest
= NULL
;
3040 struct btrfs_super_block
*super
;
3045 /* we would like to check all the supers, but that would make
3046 * a btrfs mount succeed after a mkfs from a different FS.
3047 * So, we need to add a special mount option to scan for
3048 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
3050 for (i
= 0; i
< 1; i
++) {
3051 bytenr
= btrfs_sb_offset(i
);
3052 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
>=
3053 i_size_read(bdev
->bd_inode
))
3055 bh
= __bread(bdev
, bytenr
/ 4096,
3056 BTRFS_SUPER_INFO_SIZE
);
3060 super
= (struct btrfs_super_block
*)bh
->b_data
;
3061 if (btrfs_super_bytenr(super
) != bytenr
||
3062 btrfs_super_magic(super
) != BTRFS_MAGIC
) {
3067 if (!latest
|| btrfs_super_generation(super
) > transid
) {
3070 transid
= btrfs_super_generation(super
);
3079 * this should be called twice, once with wait == 0 and
3080 * once with wait == 1. When wait == 0 is done, all the buffer heads
3081 * we write are pinned.
3083 * They are released when wait == 1 is done.
3084 * max_mirrors must be the same for both runs, and it indicates how
3085 * many supers on this one device should be written.
3087 * max_mirrors == 0 means to write them all.
3089 static int write_dev_supers(struct btrfs_device
*device
,
3090 struct btrfs_super_block
*sb
,
3091 int do_barriers
, int wait
, int max_mirrors
)
3093 struct buffer_head
*bh
;
3100 if (max_mirrors
== 0)
3101 max_mirrors
= BTRFS_SUPER_MIRROR_MAX
;
3103 for (i
= 0; i
< max_mirrors
; i
++) {
3104 bytenr
= btrfs_sb_offset(i
);
3105 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
>= device
->total_bytes
)
3109 bh
= __find_get_block(device
->bdev
, bytenr
/ 4096,
3110 BTRFS_SUPER_INFO_SIZE
);
3116 if (!buffer_uptodate(bh
))
3119 /* drop our reference */
3122 /* drop the reference from the wait == 0 run */
3126 btrfs_set_super_bytenr(sb
, bytenr
);
3129 crc
= btrfs_csum_data((char *)sb
+
3130 BTRFS_CSUM_SIZE
, crc
,
3131 BTRFS_SUPER_INFO_SIZE
-
3133 btrfs_csum_final(crc
, sb
->csum
);
3136 * one reference for us, and we leave it for the
3139 bh
= __getblk(device
->bdev
, bytenr
/ 4096,
3140 BTRFS_SUPER_INFO_SIZE
);
3142 printk(KERN_ERR
"BTRFS: couldn't get super "
3143 "buffer head for bytenr %Lu\n", bytenr
);
3148 memcpy(bh
->b_data
, sb
, BTRFS_SUPER_INFO_SIZE
);
3150 /* one reference for submit_bh */
3153 set_buffer_uptodate(bh
);
3155 bh
->b_end_io
= btrfs_end_buffer_write_sync
;
3156 bh
->b_private
= device
;
3160 * we fua the first super. The others we allow
3164 ret
= btrfsic_submit_bh(WRITE_FUA
, bh
);
3166 ret
= btrfsic_submit_bh(WRITE_SYNC
, bh
);
3170 return errors
< i
? 0 : -1;
3174 * endio for the write_dev_flush, this will wake anyone waiting
3175 * for the barrier when it is done
3177 static void btrfs_end_empty_barrier(struct bio
*bio
, int err
)
3180 if (err
== -EOPNOTSUPP
)
3181 set_bit(BIO_EOPNOTSUPP
, &bio
->bi_flags
);
3182 clear_bit(BIO_UPTODATE
, &bio
->bi_flags
);
3184 if (bio
->bi_private
)
3185 complete(bio
->bi_private
);
3190 * trigger flushes for one the devices. If you pass wait == 0, the flushes are
3191 * sent down. With wait == 1, it waits for the previous flush.
3193 * any device where the flush fails with eopnotsupp are flagged as not-barrier
3196 static int write_dev_flush(struct btrfs_device
*device
, int wait
)
3201 if (device
->nobarriers
)
3205 bio
= device
->flush_bio
;
3209 wait_for_completion(&device
->flush_wait
);
3211 if (bio_flagged(bio
, BIO_EOPNOTSUPP
)) {
3212 printk_in_rcu("BTRFS: disabling barriers on dev %s\n",
3213 rcu_str_deref(device
->name
));
3214 device
->nobarriers
= 1;
3215 } else if (!bio_flagged(bio
, BIO_UPTODATE
)) {
3217 btrfs_dev_stat_inc_and_print(device
,
3218 BTRFS_DEV_STAT_FLUSH_ERRS
);
3221 /* drop the reference from the wait == 0 run */
3223 device
->flush_bio
= NULL
;
3229 * one reference for us, and we leave it for the
3232 device
->flush_bio
= NULL
;
3233 bio
= btrfs_io_bio_alloc(GFP_NOFS
, 0);
3237 bio
->bi_end_io
= btrfs_end_empty_barrier
;
3238 bio
->bi_bdev
= device
->bdev
;
3239 init_completion(&device
->flush_wait
);
3240 bio
->bi_private
= &device
->flush_wait
;
3241 device
->flush_bio
= bio
;
3244 btrfsic_submit_bio(WRITE_FLUSH
, bio
);
3250 * send an empty flush down to each device in parallel,
3251 * then wait for them
3253 static int barrier_all_devices(struct btrfs_fs_info
*info
)
3255 struct list_head
*head
;
3256 struct btrfs_device
*dev
;
3257 int errors_send
= 0;
3258 int errors_wait
= 0;
3261 /* send down all the barriers */
3262 head
= &info
->fs_devices
->devices
;
3263 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3270 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3273 ret
= write_dev_flush(dev
, 0);
3278 /* wait for all the barriers */
3279 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3286 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3289 ret
= write_dev_flush(dev
, 1);
3293 if (errors_send
> info
->num_tolerated_disk_barrier_failures
||
3294 errors_wait
> info
->num_tolerated_disk_barrier_failures
)
3299 int btrfs_calc_num_tolerated_disk_barrier_failures(
3300 struct btrfs_fs_info
*fs_info
)
3302 struct btrfs_ioctl_space_info space
;
3303 struct btrfs_space_info
*sinfo
;
3304 u64 types
[] = {BTRFS_BLOCK_GROUP_DATA
,
3305 BTRFS_BLOCK_GROUP_SYSTEM
,
3306 BTRFS_BLOCK_GROUP_METADATA
,
3307 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
};
3311 int num_tolerated_disk_barrier_failures
=
3312 (int)fs_info
->fs_devices
->num_devices
;
3314 for (i
= 0; i
< num_types
; i
++) {
3315 struct btrfs_space_info
*tmp
;
3319 list_for_each_entry_rcu(tmp
, &fs_info
->space_info
, list
) {
3320 if (tmp
->flags
== types
[i
]) {
3330 down_read(&sinfo
->groups_sem
);
3331 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3332 if (!list_empty(&sinfo
->block_groups
[c
])) {
3335 btrfs_get_block_group_info(
3336 &sinfo
->block_groups
[c
], &space
);
3337 if (space
.total_bytes
== 0 ||
3338 space
.used_bytes
== 0)
3340 flags
= space
.flags
;
3343 * 0: if dup, single or RAID0 is configured for
3344 * any of metadata, system or data, else
3345 * 1: if RAID5 is configured, or if RAID1 or
3346 * RAID10 is configured and only two mirrors
3348 * 2: if RAID6 is configured, else
3349 * num_mirrors - 1: if RAID1 or RAID10 is
3350 * configured and more than
3351 * 2 mirrors are used.
3353 if (num_tolerated_disk_barrier_failures
> 0 &&
3354 ((flags
& (BTRFS_BLOCK_GROUP_DUP
|
3355 BTRFS_BLOCK_GROUP_RAID0
)) ||
3356 ((flags
& BTRFS_BLOCK_GROUP_PROFILE_MASK
)
3358 num_tolerated_disk_barrier_failures
= 0;
3359 else if (num_tolerated_disk_barrier_failures
> 1) {
3360 if (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
3361 BTRFS_BLOCK_GROUP_RAID5
|
3362 BTRFS_BLOCK_GROUP_RAID10
)) {
3363 num_tolerated_disk_barrier_failures
= 1;
3365 BTRFS_BLOCK_GROUP_RAID6
) {
3366 num_tolerated_disk_barrier_failures
= 2;
3371 up_read(&sinfo
->groups_sem
);
3374 return num_tolerated_disk_barrier_failures
;
3377 static int write_all_supers(struct btrfs_root
*root
, int max_mirrors
)
3379 struct list_head
*head
;
3380 struct btrfs_device
*dev
;
3381 struct btrfs_super_block
*sb
;
3382 struct btrfs_dev_item
*dev_item
;
3386 int total_errors
= 0;
3389 do_barriers
= !btrfs_test_opt(root
, NOBARRIER
);
3390 backup_super_roots(root
->fs_info
);
3392 sb
= root
->fs_info
->super_for_commit
;
3393 dev_item
= &sb
->dev_item
;
3395 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
3396 head
= &root
->fs_info
->fs_devices
->devices
;
3397 max_errors
= btrfs_super_num_devices(root
->fs_info
->super_copy
) - 1;
3400 ret
= barrier_all_devices(root
->fs_info
);
3403 &root
->fs_info
->fs_devices
->device_list_mutex
);
3404 btrfs_error(root
->fs_info
, ret
,
3405 "errors while submitting device barriers.");
3410 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3415 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3418 btrfs_set_stack_device_generation(dev_item
, 0);
3419 btrfs_set_stack_device_type(dev_item
, dev
->type
);
3420 btrfs_set_stack_device_id(dev_item
, dev
->devid
);
3421 btrfs_set_stack_device_total_bytes(dev_item
, dev
->total_bytes
);
3422 btrfs_set_stack_device_bytes_used(dev_item
, dev
->bytes_used
);
3423 btrfs_set_stack_device_io_align(dev_item
, dev
->io_align
);
3424 btrfs_set_stack_device_io_width(dev_item
, dev
->io_width
);
3425 btrfs_set_stack_device_sector_size(dev_item
, dev
->sector_size
);
3426 memcpy(dev_item
->uuid
, dev
->uuid
, BTRFS_UUID_SIZE
);
3427 memcpy(dev_item
->fsid
, dev
->fs_devices
->fsid
, BTRFS_UUID_SIZE
);
3429 flags
= btrfs_super_flags(sb
);
3430 btrfs_set_super_flags(sb
, flags
| BTRFS_HEADER_FLAG_WRITTEN
);
3432 ret
= write_dev_supers(dev
, sb
, do_barriers
, 0, max_mirrors
);
3436 if (total_errors
> max_errors
) {
3437 btrfs_err(root
->fs_info
, "%d errors while writing supers",
3439 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
3441 /* FUA is masked off if unsupported and can't be the reason */
3442 btrfs_error(root
->fs_info
, -EIO
,
3443 "%d errors while writing supers", total_errors
);
3448 list_for_each_entry_rcu(dev
, head
, dev_list
) {
3451 if (!dev
->in_fs_metadata
|| !dev
->writeable
)
3454 ret
= write_dev_supers(dev
, sb
, do_barriers
, 1, max_mirrors
);
3458 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
3459 if (total_errors
> max_errors
) {
3460 btrfs_error(root
->fs_info
, -EIO
,
3461 "%d errors while writing supers", total_errors
);
3467 int write_ctree_super(struct btrfs_trans_handle
*trans
,
3468 struct btrfs_root
*root
, int max_mirrors
)
3470 return write_all_supers(root
, max_mirrors
);
3473 /* Drop a fs root from the radix tree and free it. */
3474 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info
*fs_info
,
3475 struct btrfs_root
*root
)
3477 spin_lock(&fs_info
->fs_roots_radix_lock
);
3478 radix_tree_delete(&fs_info
->fs_roots_radix
,
3479 (unsigned long)root
->root_key
.objectid
);
3480 spin_unlock(&fs_info
->fs_roots_radix_lock
);
3482 if (btrfs_root_refs(&root
->root_item
) == 0)
3483 synchronize_srcu(&fs_info
->subvol_srcu
);
3485 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
3486 btrfs_free_log(NULL
, root
);
3488 __btrfs_remove_free_space_cache(root
->free_ino_pinned
);
3489 __btrfs_remove_free_space_cache(root
->free_ino_ctl
);
3493 static void free_fs_root(struct btrfs_root
*root
)
3495 iput(root
->cache_inode
);
3496 WARN_ON(!RB_EMPTY_ROOT(&root
->inode_tree
));
3497 btrfs_free_block_rsv(root
, root
->orphan_block_rsv
);
3498 root
->orphan_block_rsv
= NULL
;
3500 free_anon_bdev(root
->anon_dev
);
3501 free_extent_buffer(root
->node
);
3502 free_extent_buffer(root
->commit_root
);
3503 kfree(root
->free_ino_ctl
);
3504 kfree(root
->free_ino_pinned
);
3506 btrfs_put_fs_root(root
);
3509 void btrfs_free_fs_root(struct btrfs_root
*root
)
3514 int btrfs_cleanup_fs_roots(struct btrfs_fs_info
*fs_info
)
3516 u64 root_objectid
= 0;
3517 struct btrfs_root
*gang
[8];
3522 ret
= radix_tree_gang_lookup(&fs_info
->fs_roots_radix
,
3523 (void **)gang
, root_objectid
,
3528 root_objectid
= gang
[ret
- 1]->root_key
.objectid
+ 1;
3529 for (i
= 0; i
< ret
; i
++) {
3532 root_objectid
= gang
[i
]->root_key
.objectid
;
3533 err
= btrfs_orphan_cleanup(gang
[i
]);
3542 int btrfs_commit_super(struct btrfs_root
*root
)
3544 struct btrfs_trans_handle
*trans
;
3546 mutex_lock(&root
->fs_info
->cleaner_mutex
);
3547 btrfs_run_delayed_iputs(root
);
3548 mutex_unlock(&root
->fs_info
->cleaner_mutex
);
3549 wake_up_process(root
->fs_info
->cleaner_kthread
);
3551 /* wait until ongoing cleanup work done */
3552 down_write(&root
->fs_info
->cleanup_work_sem
);
3553 up_write(&root
->fs_info
->cleanup_work_sem
);
3555 trans
= btrfs_join_transaction(root
);
3557 return PTR_ERR(trans
);
3558 return btrfs_commit_transaction(trans
, root
);
3561 int close_ctree(struct btrfs_root
*root
)
3563 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3566 fs_info
->closing
= 1;
3569 /* wait for the uuid_scan task to finish */
3570 down(&fs_info
->uuid_tree_rescan_sem
);
3571 /* avoid complains from lockdep et al., set sem back to initial state */
3572 up(&fs_info
->uuid_tree_rescan_sem
);
3574 /* pause restriper - we want to resume on mount */
3575 btrfs_pause_balance(fs_info
);
3577 btrfs_dev_replace_suspend_for_unmount(fs_info
);
3579 btrfs_scrub_cancel(fs_info
);
3581 /* wait for any defraggers to finish */
3582 wait_event(fs_info
->transaction_wait
,
3583 (atomic_read(&fs_info
->defrag_running
) == 0));
3585 /* clear out the rbtree of defraggable inodes */
3586 btrfs_cleanup_defrag_inodes(fs_info
);
3588 if (!(fs_info
->sb
->s_flags
& MS_RDONLY
)) {
3589 ret
= btrfs_commit_super(root
);
3591 btrfs_err(root
->fs_info
, "commit super ret %d", ret
);
3594 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
3595 btrfs_error_commit_super(root
);
3597 kthread_stop(fs_info
->transaction_kthread
);
3598 kthread_stop(fs_info
->cleaner_kthread
);
3600 fs_info
->closing
= 2;
3603 btrfs_free_qgroup_config(root
->fs_info
);
3605 if (percpu_counter_sum(&fs_info
->delalloc_bytes
)) {
3606 btrfs_info(root
->fs_info
, "at unmount delalloc count %lld",
3607 percpu_counter_sum(&fs_info
->delalloc_bytes
));
3610 btrfs_sysfs_remove_one(fs_info
);
3612 del_fs_roots(fs_info
);
3614 btrfs_put_block_group_cache(fs_info
);
3616 btrfs_free_block_groups(fs_info
);
3618 btrfs_stop_all_workers(fs_info
);
3620 free_root_pointers(fs_info
, 1);
3622 iput(fs_info
->btree_inode
);
3624 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3625 if (btrfs_test_opt(root
, CHECK_INTEGRITY
))
3626 btrfsic_unmount(root
, fs_info
->fs_devices
);
3629 btrfs_close_devices(fs_info
->fs_devices
);
3630 btrfs_mapping_tree_free(&fs_info
->mapping_tree
);
3632 percpu_counter_destroy(&fs_info
->dirty_metadata_bytes
);
3633 percpu_counter_destroy(&fs_info
->delalloc_bytes
);
3634 percpu_counter_destroy(&fs_info
->bio_counter
);
3635 bdi_destroy(&fs_info
->bdi
);
3636 cleanup_srcu_struct(&fs_info
->subvol_srcu
);
3638 btrfs_free_stripe_hash_table(fs_info
);
3640 btrfs_free_block_rsv(root
, root
->orphan_block_rsv
);
3641 root
->orphan_block_rsv
= NULL
;
3646 int btrfs_buffer_uptodate(struct extent_buffer
*buf
, u64 parent_transid
,
3650 struct inode
*btree_inode
= buf
->pages
[0]->mapping
->host
;
3652 ret
= extent_buffer_uptodate(buf
);
3656 ret
= verify_parent_transid(&BTRFS_I(btree_inode
)->io_tree
, buf
,
3657 parent_transid
, atomic
);
3663 int btrfs_set_buffer_uptodate(struct extent_buffer
*buf
)
3665 return set_extent_buffer_uptodate(buf
);
3668 void btrfs_mark_buffer_dirty(struct extent_buffer
*buf
)
3670 struct btrfs_root
*root
;
3671 u64 transid
= btrfs_header_generation(buf
);
3674 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3676 * This is a fast path so only do this check if we have sanity tests
3677 * enabled. Normal people shouldn't be marking dummy buffers as dirty
3678 * outside of the sanity tests.
3680 if (unlikely(test_bit(EXTENT_BUFFER_DUMMY
, &buf
->bflags
)))
3683 root
= BTRFS_I(buf
->pages
[0]->mapping
->host
)->root
;
3684 btrfs_assert_tree_locked(buf
);
3685 if (transid
!= root
->fs_info
->generation
)
3686 WARN(1, KERN_CRIT
"btrfs transid mismatch buffer %llu, "
3687 "found %llu running %llu\n",
3688 buf
->start
, transid
, root
->fs_info
->generation
);
3689 was_dirty
= set_extent_buffer_dirty(buf
);
3691 __percpu_counter_add(&root
->fs_info
->dirty_metadata_bytes
,
3693 root
->fs_info
->dirty_metadata_batch
);
3696 static void __btrfs_btree_balance_dirty(struct btrfs_root
*root
,
3700 * looks as though older kernels can get into trouble with
3701 * this code, they end up stuck in balance_dirty_pages forever
3705 if (current
->flags
& PF_MEMALLOC
)
3709 btrfs_balance_delayed_items(root
);
3711 ret
= percpu_counter_compare(&root
->fs_info
->dirty_metadata_bytes
,
3712 BTRFS_DIRTY_METADATA_THRESH
);
3714 balance_dirty_pages_ratelimited(
3715 root
->fs_info
->btree_inode
->i_mapping
);
3720 void btrfs_btree_balance_dirty(struct btrfs_root
*root
)
3722 __btrfs_btree_balance_dirty(root
, 1);
3725 void btrfs_btree_balance_dirty_nodelay(struct btrfs_root
*root
)
3727 __btrfs_btree_balance_dirty(root
, 0);
3730 int btrfs_read_buffer(struct extent_buffer
*buf
, u64 parent_transid
)
3732 struct btrfs_root
*root
= BTRFS_I(buf
->pages
[0]->mapping
->host
)->root
;
3733 return btree_read_extent_buffer_pages(root
, buf
, 0, parent_transid
);
3736 static int btrfs_check_super_valid(struct btrfs_fs_info
*fs_info
,
3740 * Placeholder for checks
3745 static void btrfs_error_commit_super(struct btrfs_root
*root
)
3747 mutex_lock(&root
->fs_info
->cleaner_mutex
);
3748 btrfs_run_delayed_iputs(root
);
3749 mutex_unlock(&root
->fs_info
->cleaner_mutex
);
3751 down_write(&root
->fs_info
->cleanup_work_sem
);
3752 up_write(&root
->fs_info
->cleanup_work_sem
);
3754 /* cleanup FS via transaction */
3755 btrfs_cleanup_transaction(root
);
3758 static void btrfs_destroy_ordered_operations(struct btrfs_transaction
*t
,
3759 struct btrfs_root
*root
)
3761 struct btrfs_inode
*btrfs_inode
;
3762 struct list_head splice
;
3764 INIT_LIST_HEAD(&splice
);
3766 mutex_lock(&root
->fs_info
->ordered_operations_mutex
);
3767 spin_lock(&root
->fs_info
->ordered_root_lock
);
3769 list_splice_init(&t
->ordered_operations
, &splice
);
3770 while (!list_empty(&splice
)) {
3771 btrfs_inode
= list_entry(splice
.next
, struct btrfs_inode
,
3772 ordered_operations
);
3774 list_del_init(&btrfs_inode
->ordered_operations
);
3775 spin_unlock(&root
->fs_info
->ordered_root_lock
);
3777 btrfs_invalidate_inodes(btrfs_inode
->root
);
3779 spin_lock(&root
->fs_info
->ordered_root_lock
);
3782 spin_unlock(&root
->fs_info
->ordered_root_lock
);
3783 mutex_unlock(&root
->fs_info
->ordered_operations_mutex
);
3786 static void btrfs_destroy_ordered_extents(struct btrfs_root
*root
)
3788 struct btrfs_ordered_extent
*ordered
;
3790 spin_lock(&root
->ordered_extent_lock
);
3792 * This will just short circuit the ordered completion stuff which will
3793 * make sure the ordered extent gets properly cleaned up.
3795 list_for_each_entry(ordered
, &root
->ordered_extents
,
3797 set_bit(BTRFS_ORDERED_IOERR
, &ordered
->flags
);
3798 spin_unlock(&root
->ordered_extent_lock
);
3801 static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info
*fs_info
)
3803 struct btrfs_root
*root
;
3804 struct list_head splice
;
3806 INIT_LIST_HEAD(&splice
);
3808 spin_lock(&fs_info
->ordered_root_lock
);
3809 list_splice_init(&fs_info
->ordered_roots
, &splice
);
3810 while (!list_empty(&splice
)) {
3811 root
= list_first_entry(&splice
, struct btrfs_root
,
3813 list_move_tail(&root
->ordered_root
,
3814 &fs_info
->ordered_roots
);
3816 spin_unlock(&fs_info
->ordered_root_lock
);
3817 btrfs_destroy_ordered_extents(root
);
3820 spin_lock(&fs_info
->ordered_root_lock
);
3822 spin_unlock(&fs_info
->ordered_root_lock
);
3825 static int btrfs_destroy_delayed_refs(struct btrfs_transaction
*trans
,
3826 struct btrfs_root
*root
)
3828 struct rb_node
*node
;
3829 struct btrfs_delayed_ref_root
*delayed_refs
;
3830 struct btrfs_delayed_ref_node
*ref
;
3833 delayed_refs
= &trans
->delayed_refs
;
3835 spin_lock(&delayed_refs
->lock
);
3836 if (atomic_read(&delayed_refs
->num_entries
) == 0) {
3837 spin_unlock(&delayed_refs
->lock
);
3838 btrfs_info(root
->fs_info
, "delayed_refs has NO entry");
3842 while ((node
= rb_first(&delayed_refs
->href_root
)) != NULL
) {
3843 struct btrfs_delayed_ref_head
*head
;
3844 bool pin_bytes
= false;
3846 head
= rb_entry(node
, struct btrfs_delayed_ref_head
,
3848 if (!mutex_trylock(&head
->mutex
)) {
3849 atomic_inc(&head
->node
.refs
);
3850 spin_unlock(&delayed_refs
->lock
);
3852 mutex_lock(&head
->mutex
);
3853 mutex_unlock(&head
->mutex
);
3854 btrfs_put_delayed_ref(&head
->node
);
3855 spin_lock(&delayed_refs
->lock
);
3858 spin_lock(&head
->lock
);
3859 while ((node
= rb_first(&head
->ref_root
)) != NULL
) {
3860 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
,
3863 rb_erase(&ref
->rb_node
, &head
->ref_root
);
3864 atomic_dec(&delayed_refs
->num_entries
);
3865 btrfs_put_delayed_ref(ref
);
3867 if (head
->must_insert_reserved
)
3869 btrfs_free_delayed_extent_op(head
->extent_op
);
3870 delayed_refs
->num_heads
--;
3871 if (head
->processing
== 0)
3872 delayed_refs
->num_heads_ready
--;
3873 atomic_dec(&delayed_refs
->num_entries
);
3874 head
->node
.in_tree
= 0;
3875 rb_erase(&head
->href_node
, &delayed_refs
->href_root
);
3876 spin_unlock(&head
->lock
);
3877 spin_unlock(&delayed_refs
->lock
);
3878 mutex_unlock(&head
->mutex
);
3881 btrfs_pin_extent(root
, head
->node
.bytenr
,
3882 head
->node
.num_bytes
, 1);
3883 btrfs_put_delayed_ref(&head
->node
);
3885 spin_lock(&delayed_refs
->lock
);
3888 spin_unlock(&delayed_refs
->lock
);
3893 static void btrfs_destroy_delalloc_inodes(struct btrfs_root
*root
)
3895 struct btrfs_inode
*btrfs_inode
;
3896 struct list_head splice
;
3898 INIT_LIST_HEAD(&splice
);
3900 spin_lock(&root
->delalloc_lock
);
3901 list_splice_init(&root
->delalloc_inodes
, &splice
);
3903 while (!list_empty(&splice
)) {
3904 btrfs_inode
= list_first_entry(&splice
, struct btrfs_inode
,
3907 list_del_init(&btrfs_inode
->delalloc_inodes
);
3908 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
3909 &btrfs_inode
->runtime_flags
);
3910 spin_unlock(&root
->delalloc_lock
);
3912 btrfs_invalidate_inodes(btrfs_inode
->root
);
3914 spin_lock(&root
->delalloc_lock
);
3917 spin_unlock(&root
->delalloc_lock
);
3920 static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info
*fs_info
)
3922 struct btrfs_root
*root
;
3923 struct list_head splice
;
3925 INIT_LIST_HEAD(&splice
);
3927 spin_lock(&fs_info
->delalloc_root_lock
);
3928 list_splice_init(&fs_info
->delalloc_roots
, &splice
);
3929 while (!list_empty(&splice
)) {
3930 root
= list_first_entry(&splice
, struct btrfs_root
,
3932 list_del_init(&root
->delalloc_root
);
3933 root
= btrfs_grab_fs_root(root
);
3935 spin_unlock(&fs_info
->delalloc_root_lock
);
3937 btrfs_destroy_delalloc_inodes(root
);
3938 btrfs_put_fs_root(root
);
3940 spin_lock(&fs_info
->delalloc_root_lock
);
3942 spin_unlock(&fs_info
->delalloc_root_lock
);
3945 static int btrfs_destroy_marked_extents(struct btrfs_root
*root
,
3946 struct extent_io_tree
*dirty_pages
,
3950 struct extent_buffer
*eb
;
3955 ret
= find_first_extent_bit(dirty_pages
, start
, &start
, &end
,
3960 clear_extent_bits(dirty_pages
, start
, end
, mark
, GFP_NOFS
);
3961 while (start
<= end
) {
3962 eb
= btrfs_find_tree_block(root
, start
,
3964 start
+= root
->leafsize
;
3967 wait_on_extent_buffer_writeback(eb
);
3969 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY
,
3971 clear_extent_buffer_dirty(eb
);
3972 free_extent_buffer_stale(eb
);
3979 static int btrfs_destroy_pinned_extent(struct btrfs_root
*root
,
3980 struct extent_io_tree
*pinned_extents
)
3982 struct extent_io_tree
*unpin
;
3988 unpin
= pinned_extents
;
3991 ret
= find_first_extent_bit(unpin
, 0, &start
, &end
,
3992 EXTENT_DIRTY
, NULL
);
3997 if (btrfs_test_opt(root
, DISCARD
))
3998 ret
= btrfs_error_discard_extent(root
, start
,
4002 clear_extent_dirty(unpin
, start
, end
, GFP_NOFS
);
4003 btrfs_error_unpin_extent_range(root
, start
, end
);
4008 if (unpin
== &root
->fs_info
->freed_extents
[0])
4009 unpin
= &root
->fs_info
->freed_extents
[1];
4011 unpin
= &root
->fs_info
->freed_extents
[0];
4019 void btrfs_cleanup_one_transaction(struct btrfs_transaction
*cur_trans
,
4020 struct btrfs_root
*root
)
4022 btrfs_destroy_ordered_operations(cur_trans
, root
);
4024 btrfs_destroy_delayed_refs(cur_trans
, root
);
4026 cur_trans
->state
= TRANS_STATE_COMMIT_START
;
4027 wake_up(&root
->fs_info
->transaction_blocked_wait
);
4029 cur_trans
->state
= TRANS_STATE_UNBLOCKED
;
4030 wake_up(&root
->fs_info
->transaction_wait
);
4032 btrfs_destroy_delayed_inodes(root
);
4033 btrfs_assert_delayed_root_empty(root
);
4035 btrfs_destroy_marked_extents(root
, &cur_trans
->dirty_pages
,
4037 btrfs_destroy_pinned_extent(root
,
4038 root
->fs_info
->pinned_extents
);
4040 cur_trans
->state
=TRANS_STATE_COMPLETED
;
4041 wake_up(&cur_trans
->commit_wait
);
4044 memset(cur_trans, 0, sizeof(*cur_trans));
4045 kmem_cache_free(btrfs_transaction_cachep, cur_trans);
4049 static int btrfs_cleanup_transaction(struct btrfs_root
*root
)
4051 struct btrfs_transaction
*t
;
4053 mutex_lock(&root
->fs_info
->transaction_kthread_mutex
);
4055 spin_lock(&root
->fs_info
->trans_lock
);
4056 while (!list_empty(&root
->fs_info
->trans_list
)) {
4057 t
= list_first_entry(&root
->fs_info
->trans_list
,
4058 struct btrfs_transaction
, list
);
4059 if (t
->state
>= TRANS_STATE_COMMIT_START
) {
4060 atomic_inc(&t
->use_count
);
4061 spin_unlock(&root
->fs_info
->trans_lock
);
4062 btrfs_wait_for_commit(root
, t
->transid
);
4063 btrfs_put_transaction(t
);
4064 spin_lock(&root
->fs_info
->trans_lock
);
4067 if (t
== root
->fs_info
->running_transaction
) {
4068 t
->state
= TRANS_STATE_COMMIT_DOING
;
4069 spin_unlock(&root
->fs_info
->trans_lock
);
4071 * We wait for 0 num_writers since we don't hold a trans
4072 * handle open currently for this transaction.
4074 wait_event(t
->writer_wait
,
4075 atomic_read(&t
->num_writers
) == 0);
4077 spin_unlock(&root
->fs_info
->trans_lock
);
4079 btrfs_cleanup_one_transaction(t
, root
);
4081 spin_lock(&root
->fs_info
->trans_lock
);
4082 if (t
== root
->fs_info
->running_transaction
)
4083 root
->fs_info
->running_transaction
= NULL
;
4084 list_del_init(&t
->list
);
4085 spin_unlock(&root
->fs_info
->trans_lock
);
4087 btrfs_put_transaction(t
);
4088 trace_btrfs_transaction_commit(root
);
4089 spin_lock(&root
->fs_info
->trans_lock
);
4091 spin_unlock(&root
->fs_info
->trans_lock
);
4092 btrfs_destroy_all_ordered_extents(root
->fs_info
);
4093 btrfs_destroy_delayed_inodes(root
);
4094 btrfs_assert_delayed_root_empty(root
);
4095 btrfs_destroy_pinned_extent(root
, root
->fs_info
->pinned_extents
);
4096 btrfs_destroy_all_delalloc_inodes(root
->fs_info
);
4097 mutex_unlock(&root
->fs_info
->transaction_kthread_mutex
);
4102 static struct extent_io_ops btree_extent_io_ops
= {
4103 .readpage_end_io_hook
= btree_readpage_end_io_hook
,
4104 .readpage_io_failed_hook
= btree_io_failed_hook
,
4105 .submit_bio_hook
= btree_submit_bio_hook
,
4106 /* note we're sharing with inode.c for the merge bio hook */
4107 .merge_bio_hook
= btrfs_merge_bio_hook
,