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.
18 #include <linux/sched.h>
19 #include <linux/pagemap.h>
20 #include <linux/writeback.h>
21 #include <linux/blkdev.h>
22 #include <linux/sort.h>
23 #include <linux/rcupdate.h>
24 #include <linux/kthread.h>
25 #include <linux/slab.h>
26 #include <linux/ratelimit.h>
27 #include <linux/percpu_counter.h>
31 #include "print-tree.h"
35 #include "free-space-cache.h"
40 #undef SCRAMBLE_DELAYED_REFS
43 * control flags for do_chunk_alloc's force field
44 * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk
45 * if we really need one.
47 * CHUNK_ALLOC_LIMITED means to only try and allocate one
48 * if we have very few chunks already allocated. This is
49 * used as part of the clustering code to help make sure
50 * we have a good pool of storage to cluster in, without
51 * filling the FS with empty chunks
53 * CHUNK_ALLOC_FORCE means it must try to allocate one
57 CHUNK_ALLOC_NO_FORCE
= 0,
58 CHUNK_ALLOC_LIMITED
= 1,
59 CHUNK_ALLOC_FORCE
= 2,
63 * Control how reservations are dealt with.
65 * RESERVE_FREE - freeing a reservation.
66 * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for
68 * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update
69 * bytes_may_use as the ENOSPC accounting is done elsewhere
74 RESERVE_ALLOC_NO_ACCOUNT
= 2,
77 static int update_block_group(struct btrfs_root
*root
,
78 u64 bytenr
, u64 num_bytes
, int alloc
);
79 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
80 struct btrfs_root
*root
,
81 u64 bytenr
, u64 num_bytes
, u64 parent
,
82 u64 root_objectid
, u64 owner_objectid
,
83 u64 owner_offset
, int refs_to_drop
,
84 struct btrfs_delayed_extent_op
*extra_op
,
86 static void __run_delayed_extent_op(struct btrfs_delayed_extent_op
*extent_op
,
87 struct extent_buffer
*leaf
,
88 struct btrfs_extent_item
*ei
);
89 static int alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
90 struct btrfs_root
*root
,
91 u64 parent
, u64 root_objectid
,
92 u64 flags
, u64 owner
, u64 offset
,
93 struct btrfs_key
*ins
, int ref_mod
);
94 static int alloc_reserved_tree_block(struct btrfs_trans_handle
*trans
,
95 struct btrfs_root
*root
,
96 u64 parent
, u64 root_objectid
,
97 u64 flags
, struct btrfs_disk_key
*key
,
98 int level
, struct btrfs_key
*ins
,
100 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
,
101 struct btrfs_root
*extent_root
, u64 flags
,
103 static int find_next_key(struct btrfs_path
*path
, int level
,
104 struct btrfs_key
*key
);
105 static void dump_space_info(struct btrfs_space_info
*info
, u64 bytes
,
106 int dump_block_groups
);
107 static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache
*cache
,
108 u64 num_bytes
, int reserve
,
110 static int block_rsv_use_bytes(struct btrfs_block_rsv
*block_rsv
,
112 int btrfs_pin_extent(struct btrfs_root
*root
,
113 u64 bytenr
, u64 num_bytes
, int reserved
);
116 block_group_cache_done(struct btrfs_block_group_cache
*cache
)
119 return cache
->cached
== BTRFS_CACHE_FINISHED
||
120 cache
->cached
== BTRFS_CACHE_ERROR
;
123 static int block_group_bits(struct btrfs_block_group_cache
*cache
, u64 bits
)
125 return (cache
->flags
& bits
) == bits
;
128 static void btrfs_get_block_group(struct btrfs_block_group_cache
*cache
)
130 atomic_inc(&cache
->count
);
133 void btrfs_put_block_group(struct btrfs_block_group_cache
*cache
)
135 if (atomic_dec_and_test(&cache
->count
)) {
136 WARN_ON(cache
->pinned
> 0);
137 WARN_ON(cache
->reserved
> 0);
138 kfree(cache
->free_space_ctl
);
144 * this adds the block group to the fs_info rb tree for the block group
147 static int btrfs_add_block_group_cache(struct btrfs_fs_info
*info
,
148 struct btrfs_block_group_cache
*block_group
)
151 struct rb_node
*parent
= NULL
;
152 struct btrfs_block_group_cache
*cache
;
154 spin_lock(&info
->block_group_cache_lock
);
155 p
= &info
->block_group_cache_tree
.rb_node
;
159 cache
= rb_entry(parent
, struct btrfs_block_group_cache
,
161 if (block_group
->key
.objectid
< cache
->key
.objectid
) {
163 } else if (block_group
->key
.objectid
> cache
->key
.objectid
) {
166 spin_unlock(&info
->block_group_cache_lock
);
171 rb_link_node(&block_group
->cache_node
, parent
, p
);
172 rb_insert_color(&block_group
->cache_node
,
173 &info
->block_group_cache_tree
);
175 if (info
->first_logical_byte
> block_group
->key
.objectid
)
176 info
->first_logical_byte
= block_group
->key
.objectid
;
178 spin_unlock(&info
->block_group_cache_lock
);
184 * This will return the block group at or after bytenr if contains is 0, else
185 * it will return the block group that contains the bytenr
187 static struct btrfs_block_group_cache
*
188 block_group_cache_tree_search(struct btrfs_fs_info
*info
, u64 bytenr
,
191 struct btrfs_block_group_cache
*cache
, *ret
= NULL
;
195 spin_lock(&info
->block_group_cache_lock
);
196 n
= info
->block_group_cache_tree
.rb_node
;
199 cache
= rb_entry(n
, struct btrfs_block_group_cache
,
201 end
= cache
->key
.objectid
+ cache
->key
.offset
- 1;
202 start
= cache
->key
.objectid
;
204 if (bytenr
< start
) {
205 if (!contains
&& (!ret
|| start
< ret
->key
.objectid
))
208 } else if (bytenr
> start
) {
209 if (contains
&& bytenr
<= end
) {
220 btrfs_get_block_group(ret
);
221 if (bytenr
== 0 && info
->first_logical_byte
> ret
->key
.objectid
)
222 info
->first_logical_byte
= ret
->key
.objectid
;
224 spin_unlock(&info
->block_group_cache_lock
);
229 static int add_excluded_extent(struct btrfs_root
*root
,
230 u64 start
, u64 num_bytes
)
232 u64 end
= start
+ num_bytes
- 1;
233 set_extent_bits(&root
->fs_info
->freed_extents
[0],
234 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
235 set_extent_bits(&root
->fs_info
->freed_extents
[1],
236 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
240 static void free_excluded_extents(struct btrfs_root
*root
,
241 struct btrfs_block_group_cache
*cache
)
245 start
= cache
->key
.objectid
;
246 end
= start
+ cache
->key
.offset
- 1;
248 clear_extent_bits(&root
->fs_info
->freed_extents
[0],
249 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
250 clear_extent_bits(&root
->fs_info
->freed_extents
[1],
251 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
254 static int exclude_super_stripes(struct btrfs_root
*root
,
255 struct btrfs_block_group_cache
*cache
)
262 if (cache
->key
.objectid
< BTRFS_SUPER_INFO_OFFSET
) {
263 stripe_len
= BTRFS_SUPER_INFO_OFFSET
- cache
->key
.objectid
;
264 cache
->bytes_super
+= stripe_len
;
265 ret
= add_excluded_extent(root
, cache
->key
.objectid
,
271 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
272 bytenr
= btrfs_sb_offset(i
);
273 ret
= btrfs_rmap_block(&root
->fs_info
->mapping_tree
,
274 cache
->key
.objectid
, bytenr
,
275 0, &logical
, &nr
, &stripe_len
);
282 if (logical
[nr
] > cache
->key
.objectid
+
286 if (logical
[nr
] + stripe_len
<= cache
->key
.objectid
)
290 if (start
< cache
->key
.objectid
) {
291 start
= cache
->key
.objectid
;
292 len
= (logical
[nr
] + stripe_len
) - start
;
294 len
= min_t(u64
, stripe_len
,
295 cache
->key
.objectid
+
296 cache
->key
.offset
- start
);
299 cache
->bytes_super
+= len
;
300 ret
= add_excluded_extent(root
, start
, len
);
312 static struct btrfs_caching_control
*
313 get_caching_control(struct btrfs_block_group_cache
*cache
)
315 struct btrfs_caching_control
*ctl
;
317 spin_lock(&cache
->lock
);
318 if (cache
->cached
!= BTRFS_CACHE_STARTED
) {
319 spin_unlock(&cache
->lock
);
323 /* We're loading it the fast way, so we don't have a caching_ctl. */
324 if (!cache
->caching_ctl
) {
325 spin_unlock(&cache
->lock
);
329 ctl
= cache
->caching_ctl
;
330 atomic_inc(&ctl
->count
);
331 spin_unlock(&cache
->lock
);
335 static void put_caching_control(struct btrfs_caching_control
*ctl
)
337 if (atomic_dec_and_test(&ctl
->count
))
342 * this is only called by cache_block_group, since we could have freed extents
343 * we need to check the pinned_extents for any extents that can't be used yet
344 * since their free space will be released as soon as the transaction commits.
346 static u64
add_new_free_space(struct btrfs_block_group_cache
*block_group
,
347 struct btrfs_fs_info
*info
, u64 start
, u64 end
)
349 u64 extent_start
, extent_end
, size
, total_added
= 0;
352 while (start
< end
) {
353 ret
= find_first_extent_bit(info
->pinned_extents
, start
,
354 &extent_start
, &extent_end
,
355 EXTENT_DIRTY
| EXTENT_UPTODATE
,
360 if (extent_start
<= start
) {
361 start
= extent_end
+ 1;
362 } else if (extent_start
> start
&& extent_start
< end
) {
363 size
= extent_start
- start
;
365 ret
= btrfs_add_free_space(block_group
, start
,
367 BUG_ON(ret
); /* -ENOMEM or logic error */
368 start
= extent_end
+ 1;
377 ret
= btrfs_add_free_space(block_group
, start
, size
);
378 BUG_ON(ret
); /* -ENOMEM or logic error */
384 static noinline
void caching_thread(struct btrfs_work
*work
)
386 struct btrfs_block_group_cache
*block_group
;
387 struct btrfs_fs_info
*fs_info
;
388 struct btrfs_caching_control
*caching_ctl
;
389 struct btrfs_root
*extent_root
;
390 struct btrfs_path
*path
;
391 struct extent_buffer
*leaf
;
392 struct btrfs_key key
;
398 caching_ctl
= container_of(work
, struct btrfs_caching_control
, work
);
399 block_group
= caching_ctl
->block_group
;
400 fs_info
= block_group
->fs_info
;
401 extent_root
= fs_info
->extent_root
;
403 path
= btrfs_alloc_path();
407 last
= max_t(u64
, block_group
->key
.objectid
, BTRFS_SUPER_INFO_OFFSET
);
410 * We don't want to deadlock with somebody trying to allocate a new
411 * extent for the extent root while also trying to search the extent
412 * root to add free space. So we skip locking and search the commit
413 * root, since its read-only
415 path
->skip_locking
= 1;
416 path
->search_commit_root
= 1;
421 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
423 mutex_lock(&caching_ctl
->mutex
);
424 /* need to make sure the commit_root doesn't disappear */
425 down_read(&fs_info
->commit_root_sem
);
428 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
432 leaf
= path
->nodes
[0];
433 nritems
= btrfs_header_nritems(leaf
);
436 if (btrfs_fs_closing(fs_info
) > 1) {
441 if (path
->slots
[0] < nritems
) {
442 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
444 ret
= find_next_key(path
, 0, &key
);
448 if (need_resched() ||
449 rwsem_is_contended(&fs_info
->commit_root_sem
)) {
450 caching_ctl
->progress
= last
;
451 btrfs_release_path(path
);
452 up_read(&fs_info
->commit_root_sem
);
453 mutex_unlock(&caching_ctl
->mutex
);
458 ret
= btrfs_next_leaf(extent_root
, path
);
463 leaf
= path
->nodes
[0];
464 nritems
= btrfs_header_nritems(leaf
);
468 if (key
.objectid
< last
) {
471 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
473 caching_ctl
->progress
= last
;
474 btrfs_release_path(path
);
478 if (key
.objectid
< block_group
->key
.objectid
) {
483 if (key
.objectid
>= block_group
->key
.objectid
+
484 block_group
->key
.offset
)
487 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
||
488 key
.type
== BTRFS_METADATA_ITEM_KEY
) {
489 total_found
+= add_new_free_space(block_group
,
492 if (key
.type
== BTRFS_METADATA_ITEM_KEY
)
493 last
= key
.objectid
+
494 fs_info
->tree_root
->nodesize
;
496 last
= key
.objectid
+ key
.offset
;
498 if (total_found
> (1024 * 1024 * 2)) {
500 wake_up(&caching_ctl
->wait
);
507 total_found
+= add_new_free_space(block_group
, fs_info
, last
,
508 block_group
->key
.objectid
+
509 block_group
->key
.offset
);
510 caching_ctl
->progress
= (u64
)-1;
512 spin_lock(&block_group
->lock
);
513 block_group
->caching_ctl
= NULL
;
514 block_group
->cached
= BTRFS_CACHE_FINISHED
;
515 spin_unlock(&block_group
->lock
);
518 btrfs_free_path(path
);
519 up_read(&fs_info
->commit_root_sem
);
521 free_excluded_extents(extent_root
, block_group
);
523 mutex_unlock(&caching_ctl
->mutex
);
526 spin_lock(&block_group
->lock
);
527 block_group
->caching_ctl
= NULL
;
528 block_group
->cached
= BTRFS_CACHE_ERROR
;
529 spin_unlock(&block_group
->lock
);
531 wake_up(&caching_ctl
->wait
);
533 put_caching_control(caching_ctl
);
534 btrfs_put_block_group(block_group
);
537 static int cache_block_group(struct btrfs_block_group_cache
*cache
,
541 struct btrfs_fs_info
*fs_info
= cache
->fs_info
;
542 struct btrfs_caching_control
*caching_ctl
;
545 caching_ctl
= kzalloc(sizeof(*caching_ctl
), GFP_NOFS
);
549 INIT_LIST_HEAD(&caching_ctl
->list
);
550 mutex_init(&caching_ctl
->mutex
);
551 init_waitqueue_head(&caching_ctl
->wait
);
552 caching_ctl
->block_group
= cache
;
553 caching_ctl
->progress
= cache
->key
.objectid
;
554 atomic_set(&caching_ctl
->count
, 1);
555 btrfs_init_work(&caching_ctl
->work
, btrfs_cache_helper
,
556 caching_thread
, NULL
, NULL
);
558 spin_lock(&cache
->lock
);
560 * This should be a rare occasion, but this could happen I think in the
561 * case where one thread starts to load the space cache info, and then
562 * some other thread starts a transaction commit which tries to do an
563 * allocation while the other thread is still loading the space cache
564 * info. The previous loop should have kept us from choosing this block
565 * group, but if we've moved to the state where we will wait on caching
566 * block groups we need to first check if we're doing a fast load here,
567 * so we can wait for it to finish, otherwise we could end up allocating
568 * from a block group who's cache gets evicted for one reason or
571 while (cache
->cached
== BTRFS_CACHE_FAST
) {
572 struct btrfs_caching_control
*ctl
;
574 ctl
= cache
->caching_ctl
;
575 atomic_inc(&ctl
->count
);
576 prepare_to_wait(&ctl
->wait
, &wait
, TASK_UNINTERRUPTIBLE
);
577 spin_unlock(&cache
->lock
);
581 finish_wait(&ctl
->wait
, &wait
);
582 put_caching_control(ctl
);
583 spin_lock(&cache
->lock
);
586 if (cache
->cached
!= BTRFS_CACHE_NO
) {
587 spin_unlock(&cache
->lock
);
591 WARN_ON(cache
->caching_ctl
);
592 cache
->caching_ctl
= caching_ctl
;
593 cache
->cached
= BTRFS_CACHE_FAST
;
594 spin_unlock(&cache
->lock
);
596 if (fs_info
->mount_opt
& BTRFS_MOUNT_SPACE_CACHE
) {
597 ret
= load_free_space_cache(fs_info
, cache
);
599 spin_lock(&cache
->lock
);
601 cache
->caching_ctl
= NULL
;
602 cache
->cached
= BTRFS_CACHE_FINISHED
;
603 cache
->last_byte_to_unpin
= (u64
)-1;
605 if (load_cache_only
) {
606 cache
->caching_ctl
= NULL
;
607 cache
->cached
= BTRFS_CACHE_NO
;
609 cache
->cached
= BTRFS_CACHE_STARTED
;
612 spin_unlock(&cache
->lock
);
613 wake_up(&caching_ctl
->wait
);
615 put_caching_control(caching_ctl
);
616 free_excluded_extents(fs_info
->extent_root
, cache
);
621 * We are not going to do the fast caching, set cached to the
622 * appropriate value and wakeup any waiters.
624 spin_lock(&cache
->lock
);
625 if (load_cache_only
) {
626 cache
->caching_ctl
= NULL
;
627 cache
->cached
= BTRFS_CACHE_NO
;
629 cache
->cached
= BTRFS_CACHE_STARTED
;
631 spin_unlock(&cache
->lock
);
632 wake_up(&caching_ctl
->wait
);
635 if (load_cache_only
) {
636 put_caching_control(caching_ctl
);
640 down_write(&fs_info
->commit_root_sem
);
641 atomic_inc(&caching_ctl
->count
);
642 list_add_tail(&caching_ctl
->list
, &fs_info
->caching_block_groups
);
643 up_write(&fs_info
->commit_root_sem
);
645 btrfs_get_block_group(cache
);
647 btrfs_queue_work(fs_info
->caching_workers
, &caching_ctl
->work
);
653 * return the block group that starts at or after bytenr
655 static struct btrfs_block_group_cache
*
656 btrfs_lookup_first_block_group(struct btrfs_fs_info
*info
, u64 bytenr
)
658 struct btrfs_block_group_cache
*cache
;
660 cache
= block_group_cache_tree_search(info
, bytenr
, 0);
666 * return the block group that contains the given bytenr
668 struct btrfs_block_group_cache
*btrfs_lookup_block_group(
669 struct btrfs_fs_info
*info
,
672 struct btrfs_block_group_cache
*cache
;
674 cache
= block_group_cache_tree_search(info
, bytenr
, 1);
679 static struct btrfs_space_info
*__find_space_info(struct btrfs_fs_info
*info
,
682 struct list_head
*head
= &info
->space_info
;
683 struct btrfs_space_info
*found
;
685 flags
&= BTRFS_BLOCK_GROUP_TYPE_MASK
;
688 list_for_each_entry_rcu(found
, head
, list
) {
689 if (found
->flags
& flags
) {
699 * after adding space to the filesystem, we need to clear the full flags
700 * on all the space infos.
702 void btrfs_clear_space_info_full(struct btrfs_fs_info
*info
)
704 struct list_head
*head
= &info
->space_info
;
705 struct btrfs_space_info
*found
;
708 list_for_each_entry_rcu(found
, head
, list
)
713 /* simple helper to search for an existing extent at a given offset */
714 int btrfs_lookup_extent(struct btrfs_root
*root
, u64 start
, u64 len
)
717 struct btrfs_key key
;
718 struct btrfs_path
*path
;
720 path
= btrfs_alloc_path();
724 key
.objectid
= start
;
726 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
727 ret
= btrfs_search_slot(NULL
, root
->fs_info
->extent_root
, &key
, path
,
730 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
731 if (key
.objectid
== start
&&
732 key
.type
== BTRFS_METADATA_ITEM_KEY
)
735 btrfs_free_path(path
);
740 * helper function to lookup reference count and flags of a tree block.
742 * the head node for delayed ref is used to store the sum of all the
743 * reference count modifications queued up in the rbtree. the head
744 * node may also store the extent flags to set. This way you can check
745 * to see what the reference count and extent flags would be if all of
746 * the delayed refs are not processed.
748 int btrfs_lookup_extent_info(struct btrfs_trans_handle
*trans
,
749 struct btrfs_root
*root
, u64 bytenr
,
750 u64 offset
, int metadata
, u64
*refs
, u64
*flags
)
752 struct btrfs_delayed_ref_head
*head
;
753 struct btrfs_delayed_ref_root
*delayed_refs
;
754 struct btrfs_path
*path
;
755 struct btrfs_extent_item
*ei
;
756 struct extent_buffer
*leaf
;
757 struct btrfs_key key
;
764 * If we don't have skinny metadata, don't bother doing anything
767 if (metadata
&& !btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
)) {
768 offset
= root
->nodesize
;
772 path
= btrfs_alloc_path();
777 path
->skip_locking
= 1;
778 path
->search_commit_root
= 1;
782 key
.objectid
= bytenr
;
785 key
.type
= BTRFS_METADATA_ITEM_KEY
;
787 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
790 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
,
795 if (ret
> 0 && metadata
&& key
.type
== BTRFS_METADATA_ITEM_KEY
) {
796 if (path
->slots
[0]) {
798 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
800 if (key
.objectid
== bytenr
&&
801 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
802 key
.offset
== root
->nodesize
)
806 key
.objectid
= bytenr
;
807 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
808 key
.offset
= root
->nodesize
;
809 btrfs_release_path(path
);
815 leaf
= path
->nodes
[0];
816 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
817 if (item_size
>= sizeof(*ei
)) {
818 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
819 struct btrfs_extent_item
);
820 num_refs
= btrfs_extent_refs(leaf
, ei
);
821 extent_flags
= btrfs_extent_flags(leaf
, ei
);
823 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
824 struct btrfs_extent_item_v0
*ei0
;
825 BUG_ON(item_size
!= sizeof(*ei0
));
826 ei0
= btrfs_item_ptr(leaf
, path
->slots
[0],
827 struct btrfs_extent_item_v0
);
828 num_refs
= btrfs_extent_refs_v0(leaf
, ei0
);
829 /* FIXME: this isn't correct for data */
830 extent_flags
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
835 BUG_ON(num_refs
== 0);
845 delayed_refs
= &trans
->transaction
->delayed_refs
;
846 spin_lock(&delayed_refs
->lock
);
847 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
849 if (!mutex_trylock(&head
->mutex
)) {
850 atomic_inc(&head
->node
.refs
);
851 spin_unlock(&delayed_refs
->lock
);
853 btrfs_release_path(path
);
856 * Mutex was contended, block until it's released and try
859 mutex_lock(&head
->mutex
);
860 mutex_unlock(&head
->mutex
);
861 btrfs_put_delayed_ref(&head
->node
);
864 spin_lock(&head
->lock
);
865 if (head
->extent_op
&& head
->extent_op
->update_flags
)
866 extent_flags
|= head
->extent_op
->flags_to_set
;
868 BUG_ON(num_refs
== 0);
870 num_refs
+= head
->node
.ref_mod
;
871 spin_unlock(&head
->lock
);
872 mutex_unlock(&head
->mutex
);
874 spin_unlock(&delayed_refs
->lock
);
876 WARN_ON(num_refs
== 0);
880 *flags
= extent_flags
;
882 btrfs_free_path(path
);
887 * Back reference rules. Back refs have three main goals:
889 * 1) differentiate between all holders of references to an extent so that
890 * when a reference is dropped we can make sure it was a valid reference
891 * before freeing the extent.
893 * 2) Provide enough information to quickly find the holders of an extent
894 * if we notice a given block is corrupted or bad.
896 * 3) Make it easy to migrate blocks for FS shrinking or storage pool
897 * maintenance. This is actually the same as #2, but with a slightly
898 * different use case.
900 * There are two kinds of back refs. The implicit back refs is optimized
901 * for pointers in non-shared tree blocks. For a given pointer in a block,
902 * back refs of this kind provide information about the block's owner tree
903 * and the pointer's key. These information allow us to find the block by
904 * b-tree searching. The full back refs is for pointers in tree blocks not
905 * referenced by their owner trees. The location of tree block is recorded
906 * in the back refs. Actually the full back refs is generic, and can be
907 * used in all cases the implicit back refs is used. The major shortcoming
908 * of the full back refs is its overhead. Every time a tree block gets
909 * COWed, we have to update back refs entry for all pointers in it.
911 * For a newly allocated tree block, we use implicit back refs for
912 * pointers in it. This means most tree related operations only involve
913 * implicit back refs. For a tree block created in old transaction, the
914 * only way to drop a reference to it is COW it. So we can detect the
915 * event that tree block loses its owner tree's reference and do the
916 * back refs conversion.
918 * When a tree block is COW'd through a tree, there are four cases:
920 * The reference count of the block is one and the tree is the block's
921 * owner tree. Nothing to do in this case.
923 * The reference count of the block is one and the tree is not the
924 * block's owner tree. In this case, full back refs is used for pointers
925 * in the block. Remove these full back refs, add implicit back refs for
926 * every pointers in the new block.
928 * The reference count of the block is greater than one and the tree is
929 * the block's owner tree. In this case, implicit back refs is used for
930 * pointers in the block. Add full back refs for every pointers in the
931 * block, increase lower level extents' reference counts. The original
932 * implicit back refs are entailed to the new block.
934 * The reference count of the block is greater than one and the tree is
935 * not the block's owner tree. Add implicit back refs for every pointer in
936 * the new block, increase lower level extents' reference count.
938 * Back Reference Key composing:
940 * The key objectid corresponds to the first byte in the extent,
941 * The key type is used to differentiate between types of back refs.
942 * There are different meanings of the key offset for different types
945 * File extents can be referenced by:
947 * - multiple snapshots, subvolumes, or different generations in one subvol
948 * - different files inside a single subvolume
949 * - different offsets inside a file (bookend extents in file.c)
951 * The extent ref structure for the implicit back refs has fields for:
953 * - Objectid of the subvolume root
954 * - objectid of the file holding the reference
955 * - original offset in the file
956 * - how many bookend extents
958 * The key offset for the implicit back refs is hash of the first
961 * The extent ref structure for the full back refs has field for:
963 * - number of pointers in the tree leaf
965 * The key offset for the implicit back refs is the first byte of
968 * When a file extent is allocated, The implicit back refs is used.
969 * the fields are filled in:
971 * (root_key.objectid, inode objectid, offset in file, 1)
973 * When a file extent is removed file truncation, we find the
974 * corresponding implicit back refs and check the following fields:
976 * (btrfs_header_owner(leaf), inode objectid, offset in file)
978 * Btree extents can be referenced by:
980 * - Different subvolumes
982 * Both the implicit back refs and the full back refs for tree blocks
983 * only consist of key. The key offset for the implicit back refs is
984 * objectid of block's owner tree. The key offset for the full back refs
985 * is the first byte of parent block.
987 * When implicit back refs is used, information about the lowest key and
988 * level of the tree block are required. These information are stored in
989 * tree block info structure.
992 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
993 static int convert_extent_item_v0(struct btrfs_trans_handle
*trans
,
994 struct btrfs_root
*root
,
995 struct btrfs_path
*path
,
996 u64 owner
, u32 extra_size
)
998 struct btrfs_extent_item
*item
;
999 struct btrfs_extent_item_v0
*ei0
;
1000 struct btrfs_extent_ref_v0
*ref0
;
1001 struct btrfs_tree_block_info
*bi
;
1002 struct extent_buffer
*leaf
;
1003 struct btrfs_key key
;
1004 struct btrfs_key found_key
;
1005 u32 new_size
= sizeof(*item
);
1009 leaf
= path
->nodes
[0];
1010 BUG_ON(btrfs_item_size_nr(leaf
, path
->slots
[0]) != sizeof(*ei0
));
1012 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1013 ei0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1014 struct btrfs_extent_item_v0
);
1015 refs
= btrfs_extent_refs_v0(leaf
, ei0
);
1017 if (owner
== (u64
)-1) {
1019 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
1020 ret
= btrfs_next_leaf(root
, path
);
1023 BUG_ON(ret
> 0); /* Corruption */
1024 leaf
= path
->nodes
[0];
1026 btrfs_item_key_to_cpu(leaf
, &found_key
,
1028 BUG_ON(key
.objectid
!= found_key
.objectid
);
1029 if (found_key
.type
!= BTRFS_EXTENT_REF_V0_KEY
) {
1033 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1034 struct btrfs_extent_ref_v0
);
1035 owner
= btrfs_ref_objectid_v0(leaf
, ref0
);
1039 btrfs_release_path(path
);
1041 if (owner
< BTRFS_FIRST_FREE_OBJECTID
)
1042 new_size
+= sizeof(*bi
);
1044 new_size
-= sizeof(*ei0
);
1045 ret
= btrfs_search_slot(trans
, root
, &key
, path
,
1046 new_size
+ extra_size
, 1);
1049 BUG_ON(ret
); /* Corruption */
1051 btrfs_extend_item(root
, path
, new_size
);
1053 leaf
= path
->nodes
[0];
1054 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1055 btrfs_set_extent_refs(leaf
, item
, refs
);
1056 /* FIXME: get real generation */
1057 btrfs_set_extent_generation(leaf
, item
, 0);
1058 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1059 btrfs_set_extent_flags(leaf
, item
,
1060 BTRFS_EXTENT_FLAG_TREE_BLOCK
|
1061 BTRFS_BLOCK_FLAG_FULL_BACKREF
);
1062 bi
= (struct btrfs_tree_block_info
*)(item
+ 1);
1063 /* FIXME: get first key of the block */
1064 memset_extent_buffer(leaf
, 0, (unsigned long)bi
, sizeof(*bi
));
1065 btrfs_set_tree_block_level(leaf
, bi
, (int)owner
);
1067 btrfs_set_extent_flags(leaf
, item
, BTRFS_EXTENT_FLAG_DATA
);
1069 btrfs_mark_buffer_dirty(leaf
);
1074 static u64
hash_extent_data_ref(u64 root_objectid
, u64 owner
, u64 offset
)
1076 u32 high_crc
= ~(u32
)0;
1077 u32 low_crc
= ~(u32
)0;
1080 lenum
= cpu_to_le64(root_objectid
);
1081 high_crc
= btrfs_crc32c(high_crc
, &lenum
, sizeof(lenum
));
1082 lenum
= cpu_to_le64(owner
);
1083 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
1084 lenum
= cpu_to_le64(offset
);
1085 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
1087 return ((u64
)high_crc
<< 31) ^ (u64
)low_crc
;
1090 static u64
hash_extent_data_ref_item(struct extent_buffer
*leaf
,
1091 struct btrfs_extent_data_ref
*ref
)
1093 return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf
, ref
),
1094 btrfs_extent_data_ref_objectid(leaf
, ref
),
1095 btrfs_extent_data_ref_offset(leaf
, ref
));
1098 static int match_extent_data_ref(struct extent_buffer
*leaf
,
1099 struct btrfs_extent_data_ref
*ref
,
1100 u64 root_objectid
, u64 owner
, u64 offset
)
1102 if (btrfs_extent_data_ref_root(leaf
, ref
) != root_objectid
||
1103 btrfs_extent_data_ref_objectid(leaf
, ref
) != owner
||
1104 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
1109 static noinline
int lookup_extent_data_ref(struct btrfs_trans_handle
*trans
,
1110 struct btrfs_root
*root
,
1111 struct btrfs_path
*path
,
1112 u64 bytenr
, u64 parent
,
1114 u64 owner
, u64 offset
)
1116 struct btrfs_key key
;
1117 struct btrfs_extent_data_ref
*ref
;
1118 struct extent_buffer
*leaf
;
1124 key
.objectid
= bytenr
;
1126 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1127 key
.offset
= parent
;
1129 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1130 key
.offset
= hash_extent_data_ref(root_objectid
,
1135 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1144 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1145 key
.type
= BTRFS_EXTENT_REF_V0_KEY
;
1146 btrfs_release_path(path
);
1147 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1158 leaf
= path
->nodes
[0];
1159 nritems
= btrfs_header_nritems(leaf
);
1161 if (path
->slots
[0] >= nritems
) {
1162 ret
= btrfs_next_leaf(root
, path
);
1168 leaf
= path
->nodes
[0];
1169 nritems
= btrfs_header_nritems(leaf
);
1173 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1174 if (key
.objectid
!= bytenr
||
1175 key
.type
!= BTRFS_EXTENT_DATA_REF_KEY
)
1178 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1179 struct btrfs_extent_data_ref
);
1181 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1184 btrfs_release_path(path
);
1196 static noinline
int insert_extent_data_ref(struct btrfs_trans_handle
*trans
,
1197 struct btrfs_root
*root
,
1198 struct btrfs_path
*path
,
1199 u64 bytenr
, u64 parent
,
1200 u64 root_objectid
, u64 owner
,
1201 u64 offset
, int refs_to_add
)
1203 struct btrfs_key key
;
1204 struct extent_buffer
*leaf
;
1209 key
.objectid
= bytenr
;
1211 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1212 key
.offset
= parent
;
1213 size
= sizeof(struct btrfs_shared_data_ref
);
1215 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1216 key
.offset
= hash_extent_data_ref(root_objectid
,
1218 size
= sizeof(struct btrfs_extent_data_ref
);
1221 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, size
);
1222 if (ret
&& ret
!= -EEXIST
)
1225 leaf
= path
->nodes
[0];
1227 struct btrfs_shared_data_ref
*ref
;
1228 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1229 struct btrfs_shared_data_ref
);
1231 btrfs_set_shared_data_ref_count(leaf
, ref
, refs_to_add
);
1233 num_refs
= btrfs_shared_data_ref_count(leaf
, ref
);
1234 num_refs
+= refs_to_add
;
1235 btrfs_set_shared_data_ref_count(leaf
, ref
, num_refs
);
1238 struct btrfs_extent_data_ref
*ref
;
1239 while (ret
== -EEXIST
) {
1240 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1241 struct btrfs_extent_data_ref
);
1242 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1245 btrfs_release_path(path
);
1247 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
1249 if (ret
&& ret
!= -EEXIST
)
1252 leaf
= path
->nodes
[0];
1254 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1255 struct btrfs_extent_data_ref
);
1257 btrfs_set_extent_data_ref_root(leaf
, ref
,
1259 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
1260 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
1261 btrfs_set_extent_data_ref_count(leaf
, ref
, refs_to_add
);
1263 num_refs
= btrfs_extent_data_ref_count(leaf
, ref
);
1264 num_refs
+= refs_to_add
;
1265 btrfs_set_extent_data_ref_count(leaf
, ref
, num_refs
);
1268 btrfs_mark_buffer_dirty(leaf
);
1271 btrfs_release_path(path
);
1275 static noinline
int remove_extent_data_ref(struct btrfs_trans_handle
*trans
,
1276 struct btrfs_root
*root
,
1277 struct btrfs_path
*path
,
1278 int refs_to_drop
, int *last_ref
)
1280 struct btrfs_key key
;
1281 struct btrfs_extent_data_ref
*ref1
= NULL
;
1282 struct btrfs_shared_data_ref
*ref2
= NULL
;
1283 struct extent_buffer
*leaf
;
1287 leaf
= path
->nodes
[0];
1288 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1290 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1291 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1292 struct btrfs_extent_data_ref
);
1293 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1294 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1295 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1296 struct btrfs_shared_data_ref
);
1297 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1298 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1299 } else if (key
.type
== BTRFS_EXTENT_REF_V0_KEY
) {
1300 struct btrfs_extent_ref_v0
*ref0
;
1301 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1302 struct btrfs_extent_ref_v0
);
1303 num_refs
= btrfs_ref_count_v0(leaf
, ref0
);
1309 BUG_ON(num_refs
< refs_to_drop
);
1310 num_refs
-= refs_to_drop
;
1312 if (num_refs
== 0) {
1313 ret
= btrfs_del_item(trans
, root
, path
);
1316 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
)
1317 btrfs_set_extent_data_ref_count(leaf
, ref1
, num_refs
);
1318 else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
)
1319 btrfs_set_shared_data_ref_count(leaf
, ref2
, num_refs
);
1320 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1322 struct btrfs_extent_ref_v0
*ref0
;
1323 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1324 struct btrfs_extent_ref_v0
);
1325 btrfs_set_ref_count_v0(leaf
, ref0
, num_refs
);
1328 btrfs_mark_buffer_dirty(leaf
);
1333 static noinline u32
extent_data_ref_count(struct btrfs_root
*root
,
1334 struct btrfs_path
*path
,
1335 struct btrfs_extent_inline_ref
*iref
)
1337 struct btrfs_key key
;
1338 struct extent_buffer
*leaf
;
1339 struct btrfs_extent_data_ref
*ref1
;
1340 struct btrfs_shared_data_ref
*ref2
;
1343 leaf
= path
->nodes
[0];
1344 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1346 if (btrfs_extent_inline_ref_type(leaf
, iref
) ==
1347 BTRFS_EXTENT_DATA_REF_KEY
) {
1348 ref1
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1349 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1351 ref2
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1352 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1354 } else if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1355 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1356 struct btrfs_extent_data_ref
);
1357 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1358 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1359 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1360 struct btrfs_shared_data_ref
);
1361 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1362 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1363 } else if (key
.type
== BTRFS_EXTENT_REF_V0_KEY
) {
1364 struct btrfs_extent_ref_v0
*ref0
;
1365 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1366 struct btrfs_extent_ref_v0
);
1367 num_refs
= btrfs_ref_count_v0(leaf
, ref0
);
1375 static noinline
int lookup_tree_block_ref(struct btrfs_trans_handle
*trans
,
1376 struct btrfs_root
*root
,
1377 struct btrfs_path
*path
,
1378 u64 bytenr
, u64 parent
,
1381 struct btrfs_key key
;
1384 key
.objectid
= bytenr
;
1386 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1387 key
.offset
= parent
;
1389 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1390 key
.offset
= root_objectid
;
1393 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1396 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1397 if (ret
== -ENOENT
&& parent
) {
1398 btrfs_release_path(path
);
1399 key
.type
= BTRFS_EXTENT_REF_V0_KEY
;
1400 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1408 static noinline
int insert_tree_block_ref(struct btrfs_trans_handle
*trans
,
1409 struct btrfs_root
*root
,
1410 struct btrfs_path
*path
,
1411 u64 bytenr
, u64 parent
,
1414 struct btrfs_key key
;
1417 key
.objectid
= bytenr
;
1419 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1420 key
.offset
= parent
;
1422 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1423 key
.offset
= root_objectid
;
1426 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, 0);
1427 btrfs_release_path(path
);
1431 static inline int extent_ref_type(u64 parent
, u64 owner
)
1434 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1436 type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1438 type
= BTRFS_TREE_BLOCK_REF_KEY
;
1441 type
= BTRFS_SHARED_DATA_REF_KEY
;
1443 type
= BTRFS_EXTENT_DATA_REF_KEY
;
1448 static int find_next_key(struct btrfs_path
*path
, int level
,
1449 struct btrfs_key
*key
)
1452 for (; level
< BTRFS_MAX_LEVEL
; level
++) {
1453 if (!path
->nodes
[level
])
1455 if (path
->slots
[level
] + 1 >=
1456 btrfs_header_nritems(path
->nodes
[level
]))
1459 btrfs_item_key_to_cpu(path
->nodes
[level
], key
,
1460 path
->slots
[level
] + 1);
1462 btrfs_node_key_to_cpu(path
->nodes
[level
], key
,
1463 path
->slots
[level
] + 1);
1470 * look for inline back ref. if back ref is found, *ref_ret is set
1471 * to the address of inline back ref, and 0 is returned.
1473 * if back ref isn't found, *ref_ret is set to the address where it
1474 * should be inserted, and -ENOENT is returned.
1476 * if insert is true and there are too many inline back refs, the path
1477 * points to the extent item, and -EAGAIN is returned.
1479 * NOTE: inline back refs are ordered in the same way that back ref
1480 * items in the tree are ordered.
1482 static noinline_for_stack
1483 int lookup_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1484 struct btrfs_root
*root
,
1485 struct btrfs_path
*path
,
1486 struct btrfs_extent_inline_ref
**ref_ret
,
1487 u64 bytenr
, u64 num_bytes
,
1488 u64 parent
, u64 root_objectid
,
1489 u64 owner
, u64 offset
, int insert
)
1491 struct btrfs_key key
;
1492 struct extent_buffer
*leaf
;
1493 struct btrfs_extent_item
*ei
;
1494 struct btrfs_extent_inline_ref
*iref
;
1504 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
1507 key
.objectid
= bytenr
;
1508 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1509 key
.offset
= num_bytes
;
1511 want
= extent_ref_type(parent
, owner
);
1513 extra_size
= btrfs_extent_inline_ref_size(want
);
1514 path
->keep_locks
= 1;
1519 * Owner is our parent level, so we can just add one to get the level
1520 * for the block we are interested in.
1522 if (skinny_metadata
&& owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1523 key
.type
= BTRFS_METADATA_ITEM_KEY
;
1528 ret
= btrfs_search_slot(trans
, root
, &key
, path
, extra_size
, 1);
1535 * We may be a newly converted file system which still has the old fat
1536 * extent entries for metadata, so try and see if we have one of those.
1538 if (ret
> 0 && skinny_metadata
) {
1539 skinny_metadata
= false;
1540 if (path
->slots
[0]) {
1542 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
1544 if (key
.objectid
== bytenr
&&
1545 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
1546 key
.offset
== num_bytes
)
1550 key
.objectid
= bytenr
;
1551 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1552 key
.offset
= num_bytes
;
1553 btrfs_release_path(path
);
1558 if (ret
&& !insert
) {
1561 } else if (WARN_ON(ret
)) {
1566 leaf
= path
->nodes
[0];
1567 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1568 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1569 if (item_size
< sizeof(*ei
)) {
1574 ret
= convert_extent_item_v0(trans
, root
, path
, owner
,
1580 leaf
= path
->nodes
[0];
1581 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1584 BUG_ON(item_size
< sizeof(*ei
));
1586 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1587 flags
= btrfs_extent_flags(leaf
, ei
);
1589 ptr
= (unsigned long)(ei
+ 1);
1590 end
= (unsigned long)ei
+ item_size
;
1592 if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
&& !skinny_metadata
) {
1593 ptr
+= sizeof(struct btrfs_tree_block_info
);
1603 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1604 type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1608 ptr
+= btrfs_extent_inline_ref_size(type
);
1612 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1613 struct btrfs_extent_data_ref
*dref
;
1614 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1615 if (match_extent_data_ref(leaf
, dref
, root_objectid
,
1620 if (hash_extent_data_ref_item(leaf
, dref
) <
1621 hash_extent_data_ref(root_objectid
, owner
, offset
))
1625 ref_offset
= btrfs_extent_inline_ref_offset(leaf
, iref
);
1627 if (parent
== ref_offset
) {
1631 if (ref_offset
< parent
)
1634 if (root_objectid
== ref_offset
) {
1638 if (ref_offset
< root_objectid
)
1642 ptr
+= btrfs_extent_inline_ref_size(type
);
1644 if (err
== -ENOENT
&& insert
) {
1645 if (item_size
+ extra_size
>=
1646 BTRFS_MAX_EXTENT_ITEM_SIZE(root
)) {
1651 * To add new inline back ref, we have to make sure
1652 * there is no corresponding back ref item.
1653 * For simplicity, we just do not add new inline back
1654 * ref if there is any kind of item for this block
1656 if (find_next_key(path
, 0, &key
) == 0 &&
1657 key
.objectid
== bytenr
&&
1658 key
.type
< BTRFS_BLOCK_GROUP_ITEM_KEY
) {
1663 *ref_ret
= (struct btrfs_extent_inline_ref
*)ptr
;
1666 path
->keep_locks
= 0;
1667 btrfs_unlock_up_safe(path
, 1);
1673 * helper to add new inline back ref
1675 static noinline_for_stack
1676 void setup_inline_extent_backref(struct btrfs_root
*root
,
1677 struct btrfs_path
*path
,
1678 struct btrfs_extent_inline_ref
*iref
,
1679 u64 parent
, u64 root_objectid
,
1680 u64 owner
, u64 offset
, int refs_to_add
,
1681 struct btrfs_delayed_extent_op
*extent_op
)
1683 struct extent_buffer
*leaf
;
1684 struct btrfs_extent_item
*ei
;
1687 unsigned long item_offset
;
1692 leaf
= path
->nodes
[0];
1693 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1694 item_offset
= (unsigned long)iref
- (unsigned long)ei
;
1696 type
= extent_ref_type(parent
, owner
);
1697 size
= btrfs_extent_inline_ref_size(type
);
1699 btrfs_extend_item(root
, path
, size
);
1701 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1702 refs
= btrfs_extent_refs(leaf
, ei
);
1703 refs
+= refs_to_add
;
1704 btrfs_set_extent_refs(leaf
, ei
, refs
);
1706 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1708 ptr
= (unsigned long)ei
+ item_offset
;
1709 end
= (unsigned long)ei
+ btrfs_item_size_nr(leaf
, path
->slots
[0]);
1710 if (ptr
< end
- size
)
1711 memmove_extent_buffer(leaf
, ptr
+ size
, ptr
,
1714 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1715 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
1716 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1717 struct btrfs_extent_data_ref
*dref
;
1718 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1719 btrfs_set_extent_data_ref_root(leaf
, dref
, root_objectid
);
1720 btrfs_set_extent_data_ref_objectid(leaf
, dref
, owner
);
1721 btrfs_set_extent_data_ref_offset(leaf
, dref
, offset
);
1722 btrfs_set_extent_data_ref_count(leaf
, dref
, refs_to_add
);
1723 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1724 struct btrfs_shared_data_ref
*sref
;
1725 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1726 btrfs_set_shared_data_ref_count(leaf
, sref
, refs_to_add
);
1727 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1728 } else if (type
== BTRFS_SHARED_BLOCK_REF_KEY
) {
1729 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1731 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
1733 btrfs_mark_buffer_dirty(leaf
);
1736 static int lookup_extent_backref(struct btrfs_trans_handle
*trans
,
1737 struct btrfs_root
*root
,
1738 struct btrfs_path
*path
,
1739 struct btrfs_extent_inline_ref
**ref_ret
,
1740 u64 bytenr
, u64 num_bytes
, u64 parent
,
1741 u64 root_objectid
, u64 owner
, u64 offset
)
1745 ret
= lookup_inline_extent_backref(trans
, root
, path
, ref_ret
,
1746 bytenr
, num_bytes
, parent
,
1747 root_objectid
, owner
, offset
, 0);
1751 btrfs_release_path(path
);
1754 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1755 ret
= lookup_tree_block_ref(trans
, root
, path
, bytenr
, parent
,
1758 ret
= lookup_extent_data_ref(trans
, root
, path
, bytenr
, parent
,
1759 root_objectid
, owner
, offset
);
1765 * helper to update/remove inline back ref
1767 static noinline_for_stack
1768 void update_inline_extent_backref(struct btrfs_root
*root
,
1769 struct btrfs_path
*path
,
1770 struct btrfs_extent_inline_ref
*iref
,
1772 struct btrfs_delayed_extent_op
*extent_op
,
1775 struct extent_buffer
*leaf
;
1776 struct btrfs_extent_item
*ei
;
1777 struct btrfs_extent_data_ref
*dref
= NULL
;
1778 struct btrfs_shared_data_ref
*sref
= NULL
;
1786 leaf
= path
->nodes
[0];
1787 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1788 refs
= btrfs_extent_refs(leaf
, ei
);
1789 WARN_ON(refs_to_mod
< 0 && refs
+ refs_to_mod
<= 0);
1790 refs
+= refs_to_mod
;
1791 btrfs_set_extent_refs(leaf
, ei
, refs
);
1793 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1795 type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1797 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1798 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1799 refs
= btrfs_extent_data_ref_count(leaf
, dref
);
1800 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1801 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1802 refs
= btrfs_shared_data_ref_count(leaf
, sref
);
1805 BUG_ON(refs_to_mod
!= -1);
1808 BUG_ON(refs_to_mod
< 0 && refs
< -refs_to_mod
);
1809 refs
+= refs_to_mod
;
1812 if (type
== BTRFS_EXTENT_DATA_REF_KEY
)
1813 btrfs_set_extent_data_ref_count(leaf
, dref
, refs
);
1815 btrfs_set_shared_data_ref_count(leaf
, sref
, refs
);
1818 size
= btrfs_extent_inline_ref_size(type
);
1819 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1820 ptr
= (unsigned long)iref
;
1821 end
= (unsigned long)ei
+ item_size
;
1822 if (ptr
+ size
< end
)
1823 memmove_extent_buffer(leaf
, ptr
, ptr
+ size
,
1826 btrfs_truncate_item(root
, path
, item_size
, 1);
1828 btrfs_mark_buffer_dirty(leaf
);
1831 static noinline_for_stack
1832 int insert_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1833 struct btrfs_root
*root
,
1834 struct btrfs_path
*path
,
1835 u64 bytenr
, u64 num_bytes
, u64 parent
,
1836 u64 root_objectid
, u64 owner
,
1837 u64 offset
, int refs_to_add
,
1838 struct btrfs_delayed_extent_op
*extent_op
)
1840 struct btrfs_extent_inline_ref
*iref
;
1843 ret
= lookup_inline_extent_backref(trans
, root
, path
, &iref
,
1844 bytenr
, num_bytes
, parent
,
1845 root_objectid
, owner
, offset
, 1);
1847 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
);
1848 update_inline_extent_backref(root
, path
, iref
,
1849 refs_to_add
, extent_op
, NULL
);
1850 } else if (ret
== -ENOENT
) {
1851 setup_inline_extent_backref(root
, path
, iref
, parent
,
1852 root_objectid
, owner
, offset
,
1853 refs_to_add
, extent_op
);
1859 static int insert_extent_backref(struct btrfs_trans_handle
*trans
,
1860 struct btrfs_root
*root
,
1861 struct btrfs_path
*path
,
1862 u64 bytenr
, u64 parent
, u64 root_objectid
,
1863 u64 owner
, u64 offset
, int refs_to_add
)
1866 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1867 BUG_ON(refs_to_add
!= 1);
1868 ret
= insert_tree_block_ref(trans
, root
, path
, bytenr
,
1869 parent
, root_objectid
);
1871 ret
= insert_extent_data_ref(trans
, root
, path
, bytenr
,
1872 parent
, root_objectid
,
1873 owner
, offset
, refs_to_add
);
1878 static int remove_extent_backref(struct btrfs_trans_handle
*trans
,
1879 struct btrfs_root
*root
,
1880 struct btrfs_path
*path
,
1881 struct btrfs_extent_inline_ref
*iref
,
1882 int refs_to_drop
, int is_data
, int *last_ref
)
1886 BUG_ON(!is_data
&& refs_to_drop
!= 1);
1888 update_inline_extent_backref(root
, path
, iref
,
1889 -refs_to_drop
, NULL
, last_ref
);
1890 } else if (is_data
) {
1891 ret
= remove_extent_data_ref(trans
, root
, path
, refs_to_drop
,
1895 ret
= btrfs_del_item(trans
, root
, path
);
1900 static int btrfs_issue_discard(struct block_device
*bdev
,
1903 return blkdev_issue_discard(bdev
, start
>> 9, len
>> 9, GFP_NOFS
, 0);
1906 static int btrfs_discard_extent(struct btrfs_root
*root
, u64 bytenr
,
1907 u64 num_bytes
, u64
*actual_bytes
)
1910 u64 discarded_bytes
= 0;
1911 struct btrfs_bio
*bbio
= NULL
;
1914 /* Tell the block device(s) that the sectors can be discarded */
1915 ret
= btrfs_map_block(root
->fs_info
, REQ_DISCARD
,
1916 bytenr
, &num_bytes
, &bbio
, 0);
1917 /* Error condition is -ENOMEM */
1919 struct btrfs_bio_stripe
*stripe
= bbio
->stripes
;
1923 for (i
= 0; i
< bbio
->num_stripes
; i
++, stripe
++) {
1924 if (!stripe
->dev
->can_discard
)
1927 ret
= btrfs_issue_discard(stripe
->dev
->bdev
,
1931 discarded_bytes
+= stripe
->length
;
1932 else if (ret
!= -EOPNOTSUPP
)
1933 break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */
1936 * Just in case we get back EOPNOTSUPP for some reason,
1937 * just ignore the return value so we don't screw up
1938 * people calling discard_extent.
1946 *actual_bytes
= discarded_bytes
;
1949 if (ret
== -EOPNOTSUPP
)
1954 /* Can return -ENOMEM */
1955 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1956 struct btrfs_root
*root
,
1957 u64 bytenr
, u64 num_bytes
, u64 parent
,
1958 u64 root_objectid
, u64 owner
, u64 offset
,
1962 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1964 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
&&
1965 root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
1967 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1968 ret
= btrfs_add_delayed_tree_ref(fs_info
, trans
, bytenr
,
1970 parent
, root_objectid
, (int)owner
,
1971 BTRFS_ADD_DELAYED_REF
, NULL
, no_quota
);
1973 ret
= btrfs_add_delayed_data_ref(fs_info
, trans
, bytenr
,
1975 parent
, root_objectid
, owner
, offset
,
1976 BTRFS_ADD_DELAYED_REF
, NULL
, no_quota
);
1981 static int __btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1982 struct btrfs_root
*root
,
1983 u64 bytenr
, u64 num_bytes
,
1984 u64 parent
, u64 root_objectid
,
1985 u64 owner
, u64 offset
, int refs_to_add
,
1987 struct btrfs_delayed_extent_op
*extent_op
)
1989 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1990 struct btrfs_path
*path
;
1991 struct extent_buffer
*leaf
;
1992 struct btrfs_extent_item
*item
;
1993 struct btrfs_key key
;
1996 enum btrfs_qgroup_operation_type type
= BTRFS_QGROUP_OPER_ADD_EXCL
;
1998 path
= btrfs_alloc_path();
2002 if (!is_fstree(root_objectid
) || !root
->fs_info
->quota_enabled
)
2006 path
->leave_spinning
= 1;
2007 /* this will setup the path even if it fails to insert the back ref */
2008 ret
= insert_inline_extent_backref(trans
, fs_info
->extent_root
, path
,
2009 bytenr
, num_bytes
, parent
,
2010 root_objectid
, owner
, offset
,
2011 refs_to_add
, extent_op
);
2012 if ((ret
< 0 && ret
!= -EAGAIN
) || (!ret
&& no_quota
))
2015 * Ok we were able to insert an inline extent and it appears to be a new
2016 * reference, deal with the qgroup accounting.
2018 if (!ret
&& !no_quota
) {
2019 ASSERT(root
->fs_info
->quota_enabled
);
2020 leaf
= path
->nodes
[0];
2021 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2022 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2023 struct btrfs_extent_item
);
2024 if (btrfs_extent_refs(leaf
, item
) > (u64
)refs_to_add
)
2025 type
= BTRFS_QGROUP_OPER_ADD_SHARED
;
2026 btrfs_release_path(path
);
2028 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
2029 bytenr
, num_bytes
, type
, 0);
2034 * Ok we had -EAGAIN which means we didn't have space to insert and
2035 * inline extent ref, so just update the reference count and add a
2038 leaf
= path
->nodes
[0];
2039 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2040 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2041 refs
= btrfs_extent_refs(leaf
, item
);
2043 type
= BTRFS_QGROUP_OPER_ADD_SHARED
;
2044 btrfs_set_extent_refs(leaf
, item
, refs
+ refs_to_add
);
2046 __run_delayed_extent_op(extent_op
, leaf
, item
);
2048 btrfs_mark_buffer_dirty(leaf
);
2049 btrfs_release_path(path
);
2052 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
2053 bytenr
, num_bytes
, type
, 0);
2059 path
->leave_spinning
= 1;
2060 /* now insert the actual backref */
2061 ret
= insert_extent_backref(trans
, root
->fs_info
->extent_root
,
2062 path
, bytenr
, parent
, root_objectid
,
2063 owner
, offset
, refs_to_add
);
2065 btrfs_abort_transaction(trans
, root
, ret
);
2067 btrfs_free_path(path
);
2071 static int run_delayed_data_ref(struct btrfs_trans_handle
*trans
,
2072 struct btrfs_root
*root
,
2073 struct btrfs_delayed_ref_node
*node
,
2074 struct btrfs_delayed_extent_op
*extent_op
,
2075 int insert_reserved
)
2078 struct btrfs_delayed_data_ref
*ref
;
2079 struct btrfs_key ins
;
2084 ins
.objectid
= node
->bytenr
;
2085 ins
.offset
= node
->num_bytes
;
2086 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2088 ref
= btrfs_delayed_node_to_data_ref(node
);
2089 trace_run_delayed_data_ref(node
, ref
, node
->action
);
2091 if (node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2092 parent
= ref
->parent
;
2093 ref_root
= ref
->root
;
2095 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2097 flags
|= extent_op
->flags_to_set
;
2098 ret
= alloc_reserved_file_extent(trans
, root
,
2099 parent
, ref_root
, flags
,
2100 ref
->objectid
, ref
->offset
,
2101 &ins
, node
->ref_mod
);
2102 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2103 ret
= __btrfs_inc_extent_ref(trans
, root
, node
->bytenr
,
2104 node
->num_bytes
, parent
,
2105 ref_root
, ref
->objectid
,
2106 ref
->offset
, node
->ref_mod
,
2107 node
->no_quota
, extent_op
);
2108 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2109 ret
= __btrfs_free_extent(trans
, root
, node
->bytenr
,
2110 node
->num_bytes
, parent
,
2111 ref_root
, ref
->objectid
,
2112 ref
->offset
, node
->ref_mod
,
2113 extent_op
, node
->no_quota
);
2120 static void __run_delayed_extent_op(struct btrfs_delayed_extent_op
*extent_op
,
2121 struct extent_buffer
*leaf
,
2122 struct btrfs_extent_item
*ei
)
2124 u64 flags
= btrfs_extent_flags(leaf
, ei
);
2125 if (extent_op
->update_flags
) {
2126 flags
|= extent_op
->flags_to_set
;
2127 btrfs_set_extent_flags(leaf
, ei
, flags
);
2130 if (extent_op
->update_key
) {
2131 struct btrfs_tree_block_info
*bi
;
2132 BUG_ON(!(flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
));
2133 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
2134 btrfs_set_tree_block_key(leaf
, bi
, &extent_op
->key
);
2138 static int run_delayed_extent_op(struct btrfs_trans_handle
*trans
,
2139 struct btrfs_root
*root
,
2140 struct btrfs_delayed_ref_node
*node
,
2141 struct btrfs_delayed_extent_op
*extent_op
)
2143 struct btrfs_key key
;
2144 struct btrfs_path
*path
;
2145 struct btrfs_extent_item
*ei
;
2146 struct extent_buffer
*leaf
;
2150 int metadata
= !extent_op
->is_data
;
2155 if (metadata
&& !btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
))
2158 path
= btrfs_alloc_path();
2162 key
.objectid
= node
->bytenr
;
2165 key
.type
= BTRFS_METADATA_ITEM_KEY
;
2166 key
.offset
= extent_op
->level
;
2168 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2169 key
.offset
= node
->num_bytes
;
2174 path
->leave_spinning
= 1;
2175 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
, &key
,
2183 if (path
->slots
[0] > 0) {
2185 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
2187 if (key
.objectid
== node
->bytenr
&&
2188 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
2189 key
.offset
== node
->num_bytes
)
2193 btrfs_release_path(path
);
2196 key
.objectid
= node
->bytenr
;
2197 key
.offset
= node
->num_bytes
;
2198 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2207 leaf
= path
->nodes
[0];
2208 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2209 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
2210 if (item_size
< sizeof(*ei
)) {
2211 ret
= convert_extent_item_v0(trans
, root
->fs_info
->extent_root
,
2217 leaf
= path
->nodes
[0];
2218 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2221 BUG_ON(item_size
< sizeof(*ei
));
2222 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2223 __run_delayed_extent_op(extent_op
, leaf
, ei
);
2225 btrfs_mark_buffer_dirty(leaf
);
2227 btrfs_free_path(path
);
2231 static int run_delayed_tree_ref(struct btrfs_trans_handle
*trans
,
2232 struct btrfs_root
*root
,
2233 struct btrfs_delayed_ref_node
*node
,
2234 struct btrfs_delayed_extent_op
*extent_op
,
2235 int insert_reserved
)
2238 struct btrfs_delayed_tree_ref
*ref
;
2239 struct btrfs_key ins
;
2242 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
2245 ref
= btrfs_delayed_node_to_tree_ref(node
);
2246 trace_run_delayed_tree_ref(node
, ref
, node
->action
);
2248 if (node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2249 parent
= ref
->parent
;
2250 ref_root
= ref
->root
;
2252 ins
.objectid
= node
->bytenr
;
2253 if (skinny_metadata
) {
2254 ins
.offset
= ref
->level
;
2255 ins
.type
= BTRFS_METADATA_ITEM_KEY
;
2257 ins
.offset
= node
->num_bytes
;
2258 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2261 BUG_ON(node
->ref_mod
!= 1);
2262 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2263 BUG_ON(!extent_op
|| !extent_op
->update_flags
);
2264 ret
= alloc_reserved_tree_block(trans
, root
,
2266 extent_op
->flags_to_set
,
2270 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2271 ret
= __btrfs_inc_extent_ref(trans
, root
, node
->bytenr
,
2272 node
->num_bytes
, parent
, ref_root
,
2273 ref
->level
, 0, 1, node
->no_quota
,
2275 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2276 ret
= __btrfs_free_extent(trans
, root
, node
->bytenr
,
2277 node
->num_bytes
, parent
, ref_root
,
2278 ref
->level
, 0, 1, extent_op
,
2286 /* helper function to actually process a single delayed ref entry */
2287 static int run_one_delayed_ref(struct btrfs_trans_handle
*trans
,
2288 struct btrfs_root
*root
,
2289 struct btrfs_delayed_ref_node
*node
,
2290 struct btrfs_delayed_extent_op
*extent_op
,
2291 int insert_reserved
)
2295 if (trans
->aborted
) {
2296 if (insert_reserved
)
2297 btrfs_pin_extent(root
, node
->bytenr
,
2298 node
->num_bytes
, 1);
2302 if (btrfs_delayed_ref_is_head(node
)) {
2303 struct btrfs_delayed_ref_head
*head
;
2305 * we've hit the end of the chain and we were supposed
2306 * to insert this extent into the tree. But, it got
2307 * deleted before we ever needed to insert it, so all
2308 * we have to do is clean up the accounting
2311 head
= btrfs_delayed_node_to_head(node
);
2312 trace_run_delayed_ref_head(node
, head
, node
->action
);
2314 if (insert_reserved
) {
2315 btrfs_pin_extent(root
, node
->bytenr
,
2316 node
->num_bytes
, 1);
2317 if (head
->is_data
) {
2318 ret
= btrfs_del_csums(trans
, root
,
2326 if (node
->type
== BTRFS_TREE_BLOCK_REF_KEY
||
2327 node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2328 ret
= run_delayed_tree_ref(trans
, root
, node
, extent_op
,
2330 else if (node
->type
== BTRFS_EXTENT_DATA_REF_KEY
||
2331 node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2332 ret
= run_delayed_data_ref(trans
, root
, node
, extent_op
,
2339 static noinline
struct btrfs_delayed_ref_node
*
2340 select_delayed_ref(struct btrfs_delayed_ref_head
*head
)
2342 struct rb_node
*node
;
2343 struct btrfs_delayed_ref_node
*ref
, *last
= NULL
;;
2346 * select delayed ref of type BTRFS_ADD_DELAYED_REF first.
2347 * this prevents ref count from going down to zero when
2348 * there still are pending delayed ref.
2350 node
= rb_first(&head
->ref_root
);
2352 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
,
2354 if (ref
->action
== BTRFS_ADD_DELAYED_REF
)
2356 else if (last
== NULL
)
2358 node
= rb_next(node
);
2364 * Returns 0 on success or if called with an already aborted transaction.
2365 * Returns -ENOMEM or -EIO on failure and will abort the transaction.
2367 static noinline
int __btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2368 struct btrfs_root
*root
,
2371 struct btrfs_delayed_ref_root
*delayed_refs
;
2372 struct btrfs_delayed_ref_node
*ref
;
2373 struct btrfs_delayed_ref_head
*locked_ref
= NULL
;
2374 struct btrfs_delayed_extent_op
*extent_op
;
2375 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2376 ktime_t start
= ktime_get();
2378 unsigned long count
= 0;
2379 unsigned long actual_count
= 0;
2380 int must_insert_reserved
= 0;
2382 delayed_refs
= &trans
->transaction
->delayed_refs
;
2388 spin_lock(&delayed_refs
->lock
);
2389 locked_ref
= btrfs_select_ref_head(trans
);
2391 spin_unlock(&delayed_refs
->lock
);
2395 /* grab the lock that says we are going to process
2396 * all the refs for this head */
2397 ret
= btrfs_delayed_ref_lock(trans
, locked_ref
);
2398 spin_unlock(&delayed_refs
->lock
);
2400 * we may have dropped the spin lock to get the head
2401 * mutex lock, and that might have given someone else
2402 * time to free the head. If that's true, it has been
2403 * removed from our list and we can move on.
2405 if (ret
== -EAGAIN
) {
2413 * We need to try and merge add/drops of the same ref since we
2414 * can run into issues with relocate dropping the implicit ref
2415 * and then it being added back again before the drop can
2416 * finish. If we merged anything we need to re-loop so we can
2419 spin_lock(&locked_ref
->lock
);
2420 btrfs_merge_delayed_refs(trans
, fs_info
, delayed_refs
,
2424 * locked_ref is the head node, so we have to go one
2425 * node back for any delayed ref updates
2427 ref
= select_delayed_ref(locked_ref
);
2429 if (ref
&& ref
->seq
&&
2430 btrfs_check_delayed_seq(fs_info
, delayed_refs
, ref
->seq
)) {
2431 spin_unlock(&locked_ref
->lock
);
2432 btrfs_delayed_ref_unlock(locked_ref
);
2433 spin_lock(&delayed_refs
->lock
);
2434 locked_ref
->processing
= 0;
2435 delayed_refs
->num_heads_ready
++;
2436 spin_unlock(&delayed_refs
->lock
);
2444 * record the must insert reserved flag before we
2445 * drop the spin lock.
2447 must_insert_reserved
= locked_ref
->must_insert_reserved
;
2448 locked_ref
->must_insert_reserved
= 0;
2450 extent_op
= locked_ref
->extent_op
;
2451 locked_ref
->extent_op
= NULL
;
2456 /* All delayed refs have been processed, Go ahead
2457 * and send the head node to run_one_delayed_ref,
2458 * so that any accounting fixes can happen
2460 ref
= &locked_ref
->node
;
2462 if (extent_op
&& must_insert_reserved
) {
2463 btrfs_free_delayed_extent_op(extent_op
);
2468 spin_unlock(&locked_ref
->lock
);
2469 ret
= run_delayed_extent_op(trans
, root
,
2471 btrfs_free_delayed_extent_op(extent_op
);
2475 * Need to reset must_insert_reserved if
2476 * there was an error so the abort stuff
2477 * can cleanup the reserved space
2480 if (must_insert_reserved
)
2481 locked_ref
->must_insert_reserved
= 1;
2482 locked_ref
->processing
= 0;
2483 btrfs_debug(fs_info
, "run_delayed_extent_op returned %d", ret
);
2484 btrfs_delayed_ref_unlock(locked_ref
);
2491 * Need to drop our head ref lock and re-aqcuire the
2492 * delayed ref lock and then re-check to make sure
2495 spin_unlock(&locked_ref
->lock
);
2496 spin_lock(&delayed_refs
->lock
);
2497 spin_lock(&locked_ref
->lock
);
2498 if (rb_first(&locked_ref
->ref_root
) ||
2499 locked_ref
->extent_op
) {
2500 spin_unlock(&locked_ref
->lock
);
2501 spin_unlock(&delayed_refs
->lock
);
2505 delayed_refs
->num_heads
--;
2506 rb_erase(&locked_ref
->href_node
,
2507 &delayed_refs
->href_root
);
2508 spin_unlock(&delayed_refs
->lock
);
2512 rb_erase(&ref
->rb_node
, &locked_ref
->ref_root
);
2514 atomic_dec(&delayed_refs
->num_entries
);
2516 if (!btrfs_delayed_ref_is_head(ref
)) {
2518 * when we play the delayed ref, also correct the
2521 switch (ref
->action
) {
2522 case BTRFS_ADD_DELAYED_REF
:
2523 case BTRFS_ADD_DELAYED_EXTENT
:
2524 locked_ref
->node
.ref_mod
-= ref
->ref_mod
;
2526 case BTRFS_DROP_DELAYED_REF
:
2527 locked_ref
->node
.ref_mod
+= ref
->ref_mod
;
2533 spin_unlock(&locked_ref
->lock
);
2535 ret
= run_one_delayed_ref(trans
, root
, ref
, extent_op
,
2536 must_insert_reserved
);
2538 btrfs_free_delayed_extent_op(extent_op
);
2540 locked_ref
->processing
= 0;
2541 btrfs_delayed_ref_unlock(locked_ref
);
2542 btrfs_put_delayed_ref(ref
);
2543 btrfs_debug(fs_info
, "run_one_delayed_ref returned %d", ret
);
2548 * If this node is a head, that means all the refs in this head
2549 * have been dealt with, and we will pick the next head to deal
2550 * with, so we must unlock the head and drop it from the cluster
2551 * list before we release it.
2553 if (btrfs_delayed_ref_is_head(ref
)) {
2554 btrfs_delayed_ref_unlock(locked_ref
);
2557 btrfs_put_delayed_ref(ref
);
2563 * We don't want to include ref heads since we can have empty ref heads
2564 * and those will drastically skew our runtime down since we just do
2565 * accounting, no actual extent tree updates.
2567 if (actual_count
> 0) {
2568 u64 runtime
= ktime_to_ns(ktime_sub(ktime_get(), start
));
2572 * We weigh the current average higher than our current runtime
2573 * to avoid large swings in the average.
2575 spin_lock(&delayed_refs
->lock
);
2576 avg
= fs_info
->avg_delayed_ref_runtime
* 3 + runtime
;
2577 avg
= div64_u64(avg
, 4);
2578 fs_info
->avg_delayed_ref_runtime
= avg
;
2579 spin_unlock(&delayed_refs
->lock
);
2584 #ifdef SCRAMBLE_DELAYED_REFS
2586 * Normally delayed refs get processed in ascending bytenr order. This
2587 * correlates in most cases to the order added. To expose dependencies on this
2588 * order, we start to process the tree in the middle instead of the beginning
2590 static u64
find_middle(struct rb_root
*root
)
2592 struct rb_node
*n
= root
->rb_node
;
2593 struct btrfs_delayed_ref_node
*entry
;
2596 u64 first
= 0, last
= 0;
2600 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2601 first
= entry
->bytenr
;
2605 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2606 last
= entry
->bytenr
;
2611 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2612 WARN_ON(!entry
->in_tree
);
2614 middle
= entry
->bytenr
;
2627 static inline u64
heads_to_leaves(struct btrfs_root
*root
, u64 heads
)
2631 num_bytes
= heads
* (sizeof(struct btrfs_extent_item
) +
2632 sizeof(struct btrfs_extent_inline_ref
));
2633 if (!btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
))
2634 num_bytes
+= heads
* sizeof(struct btrfs_tree_block_info
);
2637 * We don't ever fill up leaves all the way so multiply by 2 just to be
2638 * closer to what we're really going to want to ouse.
2640 return div64_u64(num_bytes
, BTRFS_LEAF_DATA_SIZE(root
));
2643 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle
*trans
,
2644 struct btrfs_root
*root
)
2646 struct btrfs_block_rsv
*global_rsv
;
2647 u64 num_heads
= trans
->transaction
->delayed_refs
.num_heads_ready
;
2651 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
2652 num_heads
= heads_to_leaves(root
, num_heads
);
2654 num_bytes
+= (num_heads
- 1) * root
->nodesize
;
2656 global_rsv
= &root
->fs_info
->global_block_rsv
;
2659 * If we can't allocate any more chunks lets make sure we have _lots_ of
2660 * wiggle room since running delayed refs can create more delayed refs.
2662 if (global_rsv
->space_info
->full
)
2665 spin_lock(&global_rsv
->lock
);
2666 if (global_rsv
->reserved
<= num_bytes
)
2668 spin_unlock(&global_rsv
->lock
);
2672 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle
*trans
,
2673 struct btrfs_root
*root
)
2675 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2677 atomic_read(&trans
->transaction
->delayed_refs
.num_entries
);
2682 avg_runtime
= fs_info
->avg_delayed_ref_runtime
;
2683 val
= num_entries
* avg_runtime
;
2684 if (num_entries
* avg_runtime
>= NSEC_PER_SEC
)
2686 if (val
>= NSEC_PER_SEC
/ 2)
2689 return btrfs_check_space_for_delayed_refs(trans
, root
);
2692 struct async_delayed_refs
{
2693 struct btrfs_root
*root
;
2697 struct completion wait
;
2698 struct btrfs_work work
;
2701 static void delayed_ref_async_start(struct btrfs_work
*work
)
2703 struct async_delayed_refs
*async
;
2704 struct btrfs_trans_handle
*trans
;
2707 async
= container_of(work
, struct async_delayed_refs
, work
);
2709 trans
= btrfs_join_transaction(async
->root
);
2710 if (IS_ERR(trans
)) {
2711 async
->error
= PTR_ERR(trans
);
2716 * trans->sync means that when we call end_transaciton, we won't
2717 * wait on delayed refs
2720 ret
= btrfs_run_delayed_refs(trans
, async
->root
, async
->count
);
2724 ret
= btrfs_end_transaction(trans
, async
->root
);
2725 if (ret
&& !async
->error
)
2729 complete(&async
->wait
);
2734 int btrfs_async_run_delayed_refs(struct btrfs_root
*root
,
2735 unsigned long count
, int wait
)
2737 struct async_delayed_refs
*async
;
2740 async
= kmalloc(sizeof(*async
), GFP_NOFS
);
2744 async
->root
= root
->fs_info
->tree_root
;
2745 async
->count
= count
;
2751 init_completion(&async
->wait
);
2753 btrfs_init_work(&async
->work
, btrfs_extent_refs_helper
,
2754 delayed_ref_async_start
, NULL
, NULL
);
2756 btrfs_queue_work(root
->fs_info
->extent_workers
, &async
->work
);
2759 wait_for_completion(&async
->wait
);
2768 * this starts processing the delayed reference count updates and
2769 * extent insertions we have queued up so far. count can be
2770 * 0, which means to process everything in the tree at the start
2771 * of the run (but not newly added entries), or it can be some target
2772 * number you'd like to process.
2774 * Returns 0 on success or if called with an aborted transaction
2775 * Returns <0 on error and aborts the transaction
2777 int btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2778 struct btrfs_root
*root
, unsigned long count
)
2780 struct rb_node
*node
;
2781 struct btrfs_delayed_ref_root
*delayed_refs
;
2782 struct btrfs_delayed_ref_head
*head
;
2784 int run_all
= count
== (unsigned long)-1;
2787 /* We'll clean this up in btrfs_cleanup_transaction */
2791 if (root
== root
->fs_info
->extent_root
)
2792 root
= root
->fs_info
->tree_root
;
2794 delayed_refs
= &trans
->transaction
->delayed_refs
;
2796 count
= atomic_read(&delayed_refs
->num_entries
) * 2;
2801 #ifdef SCRAMBLE_DELAYED_REFS
2802 delayed_refs
->run_delayed_start
= find_middle(&delayed_refs
->root
);
2804 ret
= __btrfs_run_delayed_refs(trans
, root
, count
);
2806 btrfs_abort_transaction(trans
, root
, ret
);
2811 if (!list_empty(&trans
->new_bgs
))
2812 btrfs_create_pending_block_groups(trans
, root
);
2814 spin_lock(&delayed_refs
->lock
);
2815 node
= rb_first(&delayed_refs
->href_root
);
2817 spin_unlock(&delayed_refs
->lock
);
2820 count
= (unsigned long)-1;
2823 head
= rb_entry(node
, struct btrfs_delayed_ref_head
,
2825 if (btrfs_delayed_ref_is_head(&head
->node
)) {
2826 struct btrfs_delayed_ref_node
*ref
;
2829 atomic_inc(&ref
->refs
);
2831 spin_unlock(&delayed_refs
->lock
);
2833 * Mutex was contended, block until it's
2834 * released and try again
2836 mutex_lock(&head
->mutex
);
2837 mutex_unlock(&head
->mutex
);
2839 btrfs_put_delayed_ref(ref
);
2845 node
= rb_next(node
);
2847 spin_unlock(&delayed_refs
->lock
);
2852 ret
= btrfs_delayed_qgroup_accounting(trans
, root
->fs_info
);
2855 assert_qgroups_uptodate(trans
);
2859 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle
*trans
,
2860 struct btrfs_root
*root
,
2861 u64 bytenr
, u64 num_bytes
, u64 flags
,
2862 int level
, int is_data
)
2864 struct btrfs_delayed_extent_op
*extent_op
;
2867 extent_op
= btrfs_alloc_delayed_extent_op();
2871 extent_op
->flags_to_set
= flags
;
2872 extent_op
->update_flags
= 1;
2873 extent_op
->update_key
= 0;
2874 extent_op
->is_data
= is_data
? 1 : 0;
2875 extent_op
->level
= level
;
2877 ret
= btrfs_add_delayed_extent_op(root
->fs_info
, trans
, bytenr
,
2878 num_bytes
, extent_op
);
2880 btrfs_free_delayed_extent_op(extent_op
);
2884 static noinline
int check_delayed_ref(struct btrfs_trans_handle
*trans
,
2885 struct btrfs_root
*root
,
2886 struct btrfs_path
*path
,
2887 u64 objectid
, u64 offset
, u64 bytenr
)
2889 struct btrfs_delayed_ref_head
*head
;
2890 struct btrfs_delayed_ref_node
*ref
;
2891 struct btrfs_delayed_data_ref
*data_ref
;
2892 struct btrfs_delayed_ref_root
*delayed_refs
;
2893 struct rb_node
*node
;
2896 delayed_refs
= &trans
->transaction
->delayed_refs
;
2897 spin_lock(&delayed_refs
->lock
);
2898 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
2900 spin_unlock(&delayed_refs
->lock
);
2904 if (!mutex_trylock(&head
->mutex
)) {
2905 atomic_inc(&head
->node
.refs
);
2906 spin_unlock(&delayed_refs
->lock
);
2908 btrfs_release_path(path
);
2911 * Mutex was contended, block until it's released and let
2914 mutex_lock(&head
->mutex
);
2915 mutex_unlock(&head
->mutex
);
2916 btrfs_put_delayed_ref(&head
->node
);
2919 spin_unlock(&delayed_refs
->lock
);
2921 spin_lock(&head
->lock
);
2922 node
= rb_first(&head
->ref_root
);
2924 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
, rb_node
);
2925 node
= rb_next(node
);
2927 /* If it's a shared ref we know a cross reference exists */
2928 if (ref
->type
!= BTRFS_EXTENT_DATA_REF_KEY
) {
2933 data_ref
= btrfs_delayed_node_to_data_ref(ref
);
2936 * If our ref doesn't match the one we're currently looking at
2937 * then we have a cross reference.
2939 if (data_ref
->root
!= root
->root_key
.objectid
||
2940 data_ref
->objectid
!= objectid
||
2941 data_ref
->offset
!= offset
) {
2946 spin_unlock(&head
->lock
);
2947 mutex_unlock(&head
->mutex
);
2951 static noinline
int check_committed_ref(struct btrfs_trans_handle
*trans
,
2952 struct btrfs_root
*root
,
2953 struct btrfs_path
*path
,
2954 u64 objectid
, u64 offset
, u64 bytenr
)
2956 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
2957 struct extent_buffer
*leaf
;
2958 struct btrfs_extent_data_ref
*ref
;
2959 struct btrfs_extent_inline_ref
*iref
;
2960 struct btrfs_extent_item
*ei
;
2961 struct btrfs_key key
;
2965 key
.objectid
= bytenr
;
2966 key
.offset
= (u64
)-1;
2967 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2969 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
2972 BUG_ON(ret
== 0); /* Corruption */
2975 if (path
->slots
[0] == 0)
2979 leaf
= path
->nodes
[0];
2980 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2982 if (key
.objectid
!= bytenr
|| key
.type
!= BTRFS_EXTENT_ITEM_KEY
)
2986 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2987 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
2988 if (item_size
< sizeof(*ei
)) {
2989 WARN_ON(item_size
!= sizeof(struct btrfs_extent_item_v0
));
2993 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2995 if (item_size
!= sizeof(*ei
) +
2996 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY
))
2999 if (btrfs_extent_generation(leaf
, ei
) <=
3000 btrfs_root_last_snapshot(&root
->root_item
))
3003 iref
= (struct btrfs_extent_inline_ref
*)(ei
+ 1);
3004 if (btrfs_extent_inline_ref_type(leaf
, iref
) !=
3005 BTRFS_EXTENT_DATA_REF_KEY
)
3008 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
3009 if (btrfs_extent_refs(leaf
, ei
) !=
3010 btrfs_extent_data_ref_count(leaf
, ref
) ||
3011 btrfs_extent_data_ref_root(leaf
, ref
) !=
3012 root
->root_key
.objectid
||
3013 btrfs_extent_data_ref_objectid(leaf
, ref
) != objectid
||
3014 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
3022 int btrfs_cross_ref_exist(struct btrfs_trans_handle
*trans
,
3023 struct btrfs_root
*root
,
3024 u64 objectid
, u64 offset
, u64 bytenr
)
3026 struct btrfs_path
*path
;
3030 path
= btrfs_alloc_path();
3035 ret
= check_committed_ref(trans
, root
, path
, objectid
,
3037 if (ret
&& ret
!= -ENOENT
)
3040 ret2
= check_delayed_ref(trans
, root
, path
, objectid
,
3042 } while (ret2
== -EAGAIN
);
3044 if (ret2
&& ret2
!= -ENOENT
) {
3049 if (ret
!= -ENOENT
|| ret2
!= -ENOENT
)
3052 btrfs_free_path(path
);
3053 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
3058 static int __btrfs_mod_ref(struct btrfs_trans_handle
*trans
,
3059 struct btrfs_root
*root
,
3060 struct extent_buffer
*buf
,
3061 int full_backref
, int inc
)
3068 struct btrfs_key key
;
3069 struct btrfs_file_extent_item
*fi
;
3073 int (*process_func
)(struct btrfs_trans_handle
*, struct btrfs_root
*,
3074 u64
, u64
, u64
, u64
, u64
, u64
, int);
3077 if (btrfs_test_is_dummy_root(root
))
3080 ref_root
= btrfs_header_owner(buf
);
3081 nritems
= btrfs_header_nritems(buf
);
3082 level
= btrfs_header_level(buf
);
3084 if (!test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) && level
== 0)
3088 process_func
= btrfs_inc_extent_ref
;
3090 process_func
= btrfs_free_extent
;
3093 parent
= buf
->start
;
3097 for (i
= 0; i
< nritems
; i
++) {
3099 btrfs_item_key_to_cpu(buf
, &key
, i
);
3100 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
3102 fi
= btrfs_item_ptr(buf
, i
,
3103 struct btrfs_file_extent_item
);
3104 if (btrfs_file_extent_type(buf
, fi
) ==
3105 BTRFS_FILE_EXTENT_INLINE
)
3107 bytenr
= btrfs_file_extent_disk_bytenr(buf
, fi
);
3111 num_bytes
= btrfs_file_extent_disk_num_bytes(buf
, fi
);
3112 key
.offset
-= btrfs_file_extent_offset(buf
, fi
);
3113 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
3114 parent
, ref_root
, key
.objectid
,
3119 bytenr
= btrfs_node_blockptr(buf
, i
);
3120 num_bytes
= root
->nodesize
;
3121 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
3122 parent
, ref_root
, level
- 1, 0,
3133 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3134 struct extent_buffer
*buf
, int full_backref
)
3136 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 1);
3139 int btrfs_dec_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3140 struct extent_buffer
*buf
, int full_backref
)
3142 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 0);
3145 static int write_one_cache_group(struct btrfs_trans_handle
*trans
,
3146 struct btrfs_root
*root
,
3147 struct btrfs_path
*path
,
3148 struct btrfs_block_group_cache
*cache
)
3151 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
3153 struct extent_buffer
*leaf
;
3155 ret
= btrfs_search_slot(trans
, extent_root
, &cache
->key
, path
, 0, 1);
3158 BUG_ON(ret
); /* Corruption */
3160 leaf
= path
->nodes
[0];
3161 bi
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
3162 write_extent_buffer(leaf
, &cache
->item
, bi
, sizeof(cache
->item
));
3163 btrfs_mark_buffer_dirty(leaf
);
3164 btrfs_release_path(path
);
3167 btrfs_abort_transaction(trans
, root
, ret
);
3174 static struct btrfs_block_group_cache
*
3175 next_block_group(struct btrfs_root
*root
,
3176 struct btrfs_block_group_cache
*cache
)
3178 struct rb_node
*node
;
3179 spin_lock(&root
->fs_info
->block_group_cache_lock
);
3180 node
= rb_next(&cache
->cache_node
);
3181 btrfs_put_block_group(cache
);
3183 cache
= rb_entry(node
, struct btrfs_block_group_cache
,
3185 btrfs_get_block_group(cache
);
3188 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
3192 static int cache_save_setup(struct btrfs_block_group_cache
*block_group
,
3193 struct btrfs_trans_handle
*trans
,
3194 struct btrfs_path
*path
)
3196 struct btrfs_root
*root
= block_group
->fs_info
->tree_root
;
3197 struct inode
*inode
= NULL
;
3199 int dcs
= BTRFS_DC_ERROR
;
3205 * If this block group is smaller than 100 megs don't bother caching the
3208 if (block_group
->key
.offset
< (100 * 1024 * 1024)) {
3209 spin_lock(&block_group
->lock
);
3210 block_group
->disk_cache_state
= BTRFS_DC_WRITTEN
;
3211 spin_unlock(&block_group
->lock
);
3216 inode
= lookup_free_space_inode(root
, block_group
, path
);
3217 if (IS_ERR(inode
) && PTR_ERR(inode
) != -ENOENT
) {
3218 ret
= PTR_ERR(inode
);
3219 btrfs_release_path(path
);
3223 if (IS_ERR(inode
)) {
3227 if (block_group
->ro
)
3230 ret
= create_free_space_inode(root
, trans
, block_group
, path
);
3236 /* We've already setup this transaction, go ahead and exit */
3237 if (block_group
->cache_generation
== trans
->transid
&&
3238 i_size_read(inode
)) {
3239 dcs
= BTRFS_DC_SETUP
;
3244 * We want to set the generation to 0, that way if anything goes wrong
3245 * from here on out we know not to trust this cache when we load up next
3248 BTRFS_I(inode
)->generation
= 0;
3249 ret
= btrfs_update_inode(trans
, root
, inode
);
3252 if (i_size_read(inode
) > 0) {
3253 ret
= btrfs_check_trunc_cache_free_space(root
,
3254 &root
->fs_info
->global_block_rsv
);
3258 ret
= btrfs_truncate_free_space_cache(root
, trans
, inode
);
3263 spin_lock(&block_group
->lock
);
3264 if (block_group
->cached
!= BTRFS_CACHE_FINISHED
||
3265 !btrfs_test_opt(root
, SPACE_CACHE
) ||
3266 block_group
->delalloc_bytes
) {
3268 * don't bother trying to write stuff out _if_
3269 * a) we're not cached,
3270 * b) we're with nospace_cache mount option.
3272 dcs
= BTRFS_DC_WRITTEN
;
3273 spin_unlock(&block_group
->lock
);
3276 spin_unlock(&block_group
->lock
);
3279 * Try to preallocate enough space based on how big the block group is.
3280 * Keep in mind this has to include any pinned space which could end up
3281 * taking up quite a bit since it's not folded into the other space
3284 num_pages
= (int)div64_u64(block_group
->key
.offset
, 256 * 1024 * 1024);
3289 num_pages
*= PAGE_CACHE_SIZE
;
3291 ret
= btrfs_check_data_free_space(inode
, num_pages
);
3295 ret
= btrfs_prealloc_file_range_trans(inode
, trans
, 0, 0, num_pages
,
3296 num_pages
, num_pages
,
3299 dcs
= BTRFS_DC_SETUP
;
3300 btrfs_free_reserved_data_space(inode
, num_pages
);
3305 btrfs_release_path(path
);
3307 spin_lock(&block_group
->lock
);
3308 if (!ret
&& dcs
== BTRFS_DC_SETUP
)
3309 block_group
->cache_generation
= trans
->transid
;
3310 block_group
->disk_cache_state
= dcs
;
3311 spin_unlock(&block_group
->lock
);
3316 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
3317 struct btrfs_root
*root
)
3319 struct btrfs_block_group_cache
*cache
;
3321 struct btrfs_path
*path
;
3324 path
= btrfs_alloc_path();
3330 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
3332 if (cache
->disk_cache_state
== BTRFS_DC_CLEAR
)
3334 cache
= next_block_group(root
, cache
);
3342 err
= cache_save_setup(cache
, trans
, path
);
3343 last
= cache
->key
.objectid
+ cache
->key
.offset
;
3344 btrfs_put_block_group(cache
);
3349 err
= btrfs_run_delayed_refs(trans
, root
,
3351 if (err
) /* File system offline */
3355 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
3357 if (cache
->disk_cache_state
== BTRFS_DC_CLEAR
) {
3358 btrfs_put_block_group(cache
);
3364 cache
= next_block_group(root
, cache
);
3373 if (cache
->disk_cache_state
== BTRFS_DC_SETUP
)
3374 cache
->disk_cache_state
= BTRFS_DC_NEED_WRITE
;
3376 last
= cache
->key
.objectid
+ cache
->key
.offset
;
3378 err
= write_one_cache_group(trans
, root
, path
, cache
);
3379 btrfs_put_block_group(cache
);
3380 if (err
) /* File system offline */
3386 * I don't think this is needed since we're just marking our
3387 * preallocated extent as written, but just in case it can't
3391 err
= btrfs_run_delayed_refs(trans
, root
,
3393 if (err
) /* File system offline */
3397 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
3400 * Really this shouldn't happen, but it could if we
3401 * couldn't write the entire preallocated extent and
3402 * splitting the extent resulted in a new block.
3405 btrfs_put_block_group(cache
);
3408 if (cache
->disk_cache_state
== BTRFS_DC_NEED_WRITE
)
3410 cache
= next_block_group(root
, cache
);
3419 err
= btrfs_write_out_cache(root
, trans
, cache
, path
);
3422 * If we didn't have an error then the cache state is still
3423 * NEED_WRITE, so we can set it to WRITTEN.
3425 if (!err
&& cache
->disk_cache_state
== BTRFS_DC_NEED_WRITE
)
3426 cache
->disk_cache_state
= BTRFS_DC_WRITTEN
;
3427 last
= cache
->key
.objectid
+ cache
->key
.offset
;
3428 btrfs_put_block_group(cache
);
3432 btrfs_free_path(path
);
3436 int btrfs_extent_readonly(struct btrfs_root
*root
, u64 bytenr
)
3438 struct btrfs_block_group_cache
*block_group
;
3441 block_group
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
3442 if (!block_group
|| block_group
->ro
)
3445 btrfs_put_block_group(block_group
);
3449 static const char *alloc_name(u64 flags
)
3452 case BTRFS_BLOCK_GROUP_METADATA
|BTRFS_BLOCK_GROUP_DATA
:
3454 case BTRFS_BLOCK_GROUP_METADATA
:
3456 case BTRFS_BLOCK_GROUP_DATA
:
3458 case BTRFS_BLOCK_GROUP_SYSTEM
:
3462 return "invalid-combination";
3466 static int update_space_info(struct btrfs_fs_info
*info
, u64 flags
,
3467 u64 total_bytes
, u64 bytes_used
,
3468 struct btrfs_space_info
**space_info
)
3470 struct btrfs_space_info
*found
;
3475 if (flags
& (BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID1
|
3476 BTRFS_BLOCK_GROUP_RAID10
))
3481 found
= __find_space_info(info
, flags
);
3483 spin_lock(&found
->lock
);
3484 found
->total_bytes
+= total_bytes
;
3485 found
->disk_total
+= total_bytes
* factor
;
3486 found
->bytes_used
+= bytes_used
;
3487 found
->disk_used
+= bytes_used
* factor
;
3489 spin_unlock(&found
->lock
);
3490 *space_info
= found
;
3493 found
= kzalloc(sizeof(*found
), GFP_NOFS
);
3497 ret
= percpu_counter_init(&found
->total_bytes_pinned
, 0, GFP_KERNEL
);
3503 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++)
3504 INIT_LIST_HEAD(&found
->block_groups
[i
]);
3505 init_rwsem(&found
->groups_sem
);
3506 spin_lock_init(&found
->lock
);
3507 found
->flags
= flags
& BTRFS_BLOCK_GROUP_TYPE_MASK
;
3508 found
->total_bytes
= total_bytes
;
3509 found
->disk_total
= total_bytes
* factor
;
3510 found
->bytes_used
= bytes_used
;
3511 found
->disk_used
= bytes_used
* factor
;
3512 found
->bytes_pinned
= 0;
3513 found
->bytes_reserved
= 0;
3514 found
->bytes_readonly
= 0;
3515 found
->bytes_may_use
= 0;
3517 found
->force_alloc
= CHUNK_ALLOC_NO_FORCE
;
3518 found
->chunk_alloc
= 0;
3520 init_waitqueue_head(&found
->wait
);
3522 ret
= kobject_init_and_add(&found
->kobj
, &space_info_ktype
,
3523 info
->space_info_kobj
, "%s",
3524 alloc_name(found
->flags
));
3530 *space_info
= found
;
3531 list_add_rcu(&found
->list
, &info
->space_info
);
3532 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3533 info
->data_sinfo
= found
;
3538 static void set_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
3540 u64 extra_flags
= chunk_to_extended(flags
) &
3541 BTRFS_EXTENDED_PROFILE_MASK
;
3543 write_seqlock(&fs_info
->profiles_lock
);
3544 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3545 fs_info
->avail_data_alloc_bits
|= extra_flags
;
3546 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
3547 fs_info
->avail_metadata_alloc_bits
|= extra_flags
;
3548 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
3549 fs_info
->avail_system_alloc_bits
|= extra_flags
;
3550 write_sequnlock(&fs_info
->profiles_lock
);
3554 * returns target flags in extended format or 0 if restripe for this
3555 * chunk_type is not in progress
3557 * should be called with either volume_mutex or balance_lock held
3559 static u64
get_restripe_target(struct btrfs_fs_info
*fs_info
, u64 flags
)
3561 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3567 if (flags
& BTRFS_BLOCK_GROUP_DATA
&&
3568 bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3569 target
= BTRFS_BLOCK_GROUP_DATA
| bctl
->data
.target
;
3570 } else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
&&
3571 bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3572 target
= BTRFS_BLOCK_GROUP_SYSTEM
| bctl
->sys
.target
;
3573 } else if (flags
& BTRFS_BLOCK_GROUP_METADATA
&&
3574 bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3575 target
= BTRFS_BLOCK_GROUP_METADATA
| bctl
->meta
.target
;
3582 * @flags: available profiles in extended format (see ctree.h)
3584 * Returns reduced profile in chunk format. If profile changing is in
3585 * progress (either running or paused) picks the target profile (if it's
3586 * already available), otherwise falls back to plain reducing.
3588 static u64
btrfs_reduce_alloc_profile(struct btrfs_root
*root
, u64 flags
)
3590 u64 num_devices
= root
->fs_info
->fs_devices
->rw_devices
;
3595 * see if restripe for this chunk_type is in progress, if so
3596 * try to reduce to the target profile
3598 spin_lock(&root
->fs_info
->balance_lock
);
3599 target
= get_restripe_target(root
->fs_info
, flags
);
3601 /* pick target profile only if it's already available */
3602 if ((flags
& target
) & BTRFS_EXTENDED_PROFILE_MASK
) {
3603 spin_unlock(&root
->fs_info
->balance_lock
);
3604 return extended_to_chunk(target
);
3607 spin_unlock(&root
->fs_info
->balance_lock
);
3609 /* First, mask out the RAID levels which aren't possible */
3610 if (num_devices
== 1)
3611 flags
&= ~(BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID0
|
3612 BTRFS_BLOCK_GROUP_RAID5
);
3613 if (num_devices
< 3)
3614 flags
&= ~BTRFS_BLOCK_GROUP_RAID6
;
3615 if (num_devices
< 4)
3616 flags
&= ~BTRFS_BLOCK_GROUP_RAID10
;
3618 tmp
= flags
& (BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID0
|
3619 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID5
|
3620 BTRFS_BLOCK_GROUP_RAID6
| BTRFS_BLOCK_GROUP_RAID10
);
3623 if (tmp
& BTRFS_BLOCK_GROUP_RAID6
)
3624 tmp
= BTRFS_BLOCK_GROUP_RAID6
;
3625 else if (tmp
& BTRFS_BLOCK_GROUP_RAID5
)
3626 tmp
= BTRFS_BLOCK_GROUP_RAID5
;
3627 else if (tmp
& BTRFS_BLOCK_GROUP_RAID10
)
3628 tmp
= BTRFS_BLOCK_GROUP_RAID10
;
3629 else if (tmp
& BTRFS_BLOCK_GROUP_RAID1
)
3630 tmp
= BTRFS_BLOCK_GROUP_RAID1
;
3631 else if (tmp
& BTRFS_BLOCK_GROUP_RAID0
)
3632 tmp
= BTRFS_BLOCK_GROUP_RAID0
;
3634 return extended_to_chunk(flags
| tmp
);
3637 static u64
get_alloc_profile(struct btrfs_root
*root
, u64 orig_flags
)
3644 seq
= read_seqbegin(&root
->fs_info
->profiles_lock
);
3646 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3647 flags
|= root
->fs_info
->avail_data_alloc_bits
;
3648 else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
3649 flags
|= root
->fs_info
->avail_system_alloc_bits
;
3650 else if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
3651 flags
|= root
->fs_info
->avail_metadata_alloc_bits
;
3652 } while (read_seqretry(&root
->fs_info
->profiles_lock
, seq
));
3654 return btrfs_reduce_alloc_profile(root
, flags
);
3657 u64
btrfs_get_alloc_profile(struct btrfs_root
*root
, int data
)
3663 flags
= BTRFS_BLOCK_GROUP_DATA
;
3664 else if (root
== root
->fs_info
->chunk_root
)
3665 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
3667 flags
= BTRFS_BLOCK_GROUP_METADATA
;
3669 ret
= get_alloc_profile(root
, flags
);
3674 * This will check the space that the inode allocates from to make sure we have
3675 * enough space for bytes.
3677 int btrfs_check_data_free_space(struct inode
*inode
, u64 bytes
)
3679 struct btrfs_space_info
*data_sinfo
;
3680 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3681 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3683 int ret
= 0, committed
= 0, alloc_chunk
= 1;
3685 /* make sure bytes are sectorsize aligned */
3686 bytes
= ALIGN(bytes
, root
->sectorsize
);
3688 if (btrfs_is_free_space_inode(inode
)) {
3690 ASSERT(current
->journal_info
);
3693 data_sinfo
= fs_info
->data_sinfo
;
3698 /* make sure we have enough space to handle the data first */
3699 spin_lock(&data_sinfo
->lock
);
3700 used
= data_sinfo
->bytes_used
+ data_sinfo
->bytes_reserved
+
3701 data_sinfo
->bytes_pinned
+ data_sinfo
->bytes_readonly
+
3702 data_sinfo
->bytes_may_use
;
3704 if (used
+ bytes
> data_sinfo
->total_bytes
) {
3705 struct btrfs_trans_handle
*trans
;
3708 * if we don't have enough free bytes in this space then we need
3709 * to alloc a new chunk.
3711 if (!data_sinfo
->full
&& alloc_chunk
) {
3714 data_sinfo
->force_alloc
= CHUNK_ALLOC_FORCE
;
3715 spin_unlock(&data_sinfo
->lock
);
3717 alloc_target
= btrfs_get_alloc_profile(root
, 1);
3719 * It is ugly that we don't call nolock join
3720 * transaction for the free space inode case here.
3721 * But it is safe because we only do the data space
3722 * reservation for the free space cache in the
3723 * transaction context, the common join transaction
3724 * just increase the counter of the current transaction
3725 * handler, doesn't try to acquire the trans_lock of
3728 trans
= btrfs_join_transaction(root
);
3730 return PTR_ERR(trans
);
3732 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
3734 CHUNK_ALLOC_NO_FORCE
);
3735 btrfs_end_transaction(trans
, root
);
3744 data_sinfo
= fs_info
->data_sinfo
;
3750 * If we don't have enough pinned space to deal with this
3751 * allocation don't bother committing the transaction.
3753 if (percpu_counter_compare(&data_sinfo
->total_bytes_pinned
,
3756 spin_unlock(&data_sinfo
->lock
);
3758 /* commit the current transaction and try again */
3761 !atomic_read(&root
->fs_info
->open_ioctl_trans
)) {
3764 trans
= btrfs_join_transaction(root
);
3766 return PTR_ERR(trans
);
3767 ret
= btrfs_commit_transaction(trans
, root
);
3773 trace_btrfs_space_reservation(root
->fs_info
,
3774 "space_info:enospc",
3775 data_sinfo
->flags
, bytes
, 1);
3778 data_sinfo
->bytes_may_use
+= bytes
;
3779 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
3780 data_sinfo
->flags
, bytes
, 1);
3781 spin_unlock(&data_sinfo
->lock
);
3787 * Called if we need to clear a data reservation for this inode.
3789 void btrfs_free_reserved_data_space(struct inode
*inode
, u64 bytes
)
3791 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3792 struct btrfs_space_info
*data_sinfo
;
3794 /* make sure bytes are sectorsize aligned */
3795 bytes
= ALIGN(bytes
, root
->sectorsize
);
3797 data_sinfo
= root
->fs_info
->data_sinfo
;
3798 spin_lock(&data_sinfo
->lock
);
3799 WARN_ON(data_sinfo
->bytes_may_use
< bytes
);
3800 data_sinfo
->bytes_may_use
-= bytes
;
3801 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
3802 data_sinfo
->flags
, bytes
, 0);
3803 spin_unlock(&data_sinfo
->lock
);
3806 static void force_metadata_allocation(struct btrfs_fs_info
*info
)
3808 struct list_head
*head
= &info
->space_info
;
3809 struct btrfs_space_info
*found
;
3812 list_for_each_entry_rcu(found
, head
, list
) {
3813 if (found
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
3814 found
->force_alloc
= CHUNK_ALLOC_FORCE
;
3819 static inline u64
calc_global_rsv_need_space(struct btrfs_block_rsv
*global
)
3821 return (global
->size
<< 1);
3824 static int should_alloc_chunk(struct btrfs_root
*root
,
3825 struct btrfs_space_info
*sinfo
, int force
)
3827 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
3828 u64 num_bytes
= sinfo
->total_bytes
- sinfo
->bytes_readonly
;
3829 u64 num_allocated
= sinfo
->bytes_used
+ sinfo
->bytes_reserved
;
3832 if (force
== CHUNK_ALLOC_FORCE
)
3836 * We need to take into account the global rsv because for all intents
3837 * and purposes it's used space. Don't worry about locking the
3838 * global_rsv, it doesn't change except when the transaction commits.
3840 if (sinfo
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
3841 num_allocated
+= calc_global_rsv_need_space(global_rsv
);
3844 * in limited mode, we want to have some free space up to
3845 * about 1% of the FS size.
3847 if (force
== CHUNK_ALLOC_LIMITED
) {
3848 thresh
= btrfs_super_total_bytes(root
->fs_info
->super_copy
);
3849 thresh
= max_t(u64
, 64 * 1024 * 1024,
3850 div_factor_fine(thresh
, 1));
3852 if (num_bytes
- num_allocated
< thresh
)
3856 if (num_allocated
+ 2 * 1024 * 1024 < div_factor(num_bytes
, 8))
3861 static u64
get_system_chunk_thresh(struct btrfs_root
*root
, u64 type
)
3865 if (type
& (BTRFS_BLOCK_GROUP_RAID10
|
3866 BTRFS_BLOCK_GROUP_RAID0
|
3867 BTRFS_BLOCK_GROUP_RAID5
|
3868 BTRFS_BLOCK_GROUP_RAID6
))
3869 num_dev
= root
->fs_info
->fs_devices
->rw_devices
;
3870 else if (type
& BTRFS_BLOCK_GROUP_RAID1
)
3873 num_dev
= 1; /* DUP or single */
3875 /* metadata for updaing devices and chunk tree */
3876 return btrfs_calc_trans_metadata_size(root
, num_dev
+ 1);
3879 static void check_system_chunk(struct btrfs_trans_handle
*trans
,
3880 struct btrfs_root
*root
, u64 type
)
3882 struct btrfs_space_info
*info
;
3886 info
= __find_space_info(root
->fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
3887 spin_lock(&info
->lock
);
3888 left
= info
->total_bytes
- info
->bytes_used
- info
->bytes_pinned
-
3889 info
->bytes_reserved
- info
->bytes_readonly
;
3890 spin_unlock(&info
->lock
);
3892 thresh
= get_system_chunk_thresh(root
, type
);
3893 if (left
< thresh
&& btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
3894 btrfs_info(root
->fs_info
, "left=%llu, need=%llu, flags=%llu",
3895 left
, thresh
, type
);
3896 dump_space_info(info
, 0, 0);
3899 if (left
< thresh
) {
3902 flags
= btrfs_get_alloc_profile(root
->fs_info
->chunk_root
, 0);
3903 btrfs_alloc_chunk(trans
, root
, flags
);
3907 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
,
3908 struct btrfs_root
*extent_root
, u64 flags
, int force
)
3910 struct btrfs_space_info
*space_info
;
3911 struct btrfs_fs_info
*fs_info
= extent_root
->fs_info
;
3912 int wait_for_alloc
= 0;
3915 /* Don't re-enter if we're already allocating a chunk */
3916 if (trans
->allocating_chunk
)
3919 space_info
= __find_space_info(extent_root
->fs_info
, flags
);
3921 ret
= update_space_info(extent_root
->fs_info
, flags
,
3923 BUG_ON(ret
); /* -ENOMEM */
3925 BUG_ON(!space_info
); /* Logic error */
3928 spin_lock(&space_info
->lock
);
3929 if (force
< space_info
->force_alloc
)
3930 force
= space_info
->force_alloc
;
3931 if (space_info
->full
) {
3932 if (should_alloc_chunk(extent_root
, space_info
, force
))
3936 spin_unlock(&space_info
->lock
);
3940 if (!should_alloc_chunk(extent_root
, space_info
, force
)) {
3941 spin_unlock(&space_info
->lock
);
3943 } else if (space_info
->chunk_alloc
) {
3946 space_info
->chunk_alloc
= 1;
3949 spin_unlock(&space_info
->lock
);
3951 mutex_lock(&fs_info
->chunk_mutex
);
3954 * The chunk_mutex is held throughout the entirety of a chunk
3955 * allocation, so once we've acquired the chunk_mutex we know that the
3956 * other guy is done and we need to recheck and see if we should
3959 if (wait_for_alloc
) {
3960 mutex_unlock(&fs_info
->chunk_mutex
);
3965 trans
->allocating_chunk
= true;
3968 * If we have mixed data/metadata chunks we want to make sure we keep
3969 * allocating mixed chunks instead of individual chunks.
3971 if (btrfs_mixed_space_info(space_info
))
3972 flags
|= (BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
);
3975 * if we're doing a data chunk, go ahead and make sure that
3976 * we keep a reasonable number of metadata chunks allocated in the
3979 if (flags
& BTRFS_BLOCK_GROUP_DATA
&& fs_info
->metadata_ratio
) {
3980 fs_info
->data_chunk_allocations
++;
3981 if (!(fs_info
->data_chunk_allocations
%
3982 fs_info
->metadata_ratio
))
3983 force_metadata_allocation(fs_info
);
3987 * Check if we have enough space in SYSTEM chunk because we may need
3988 * to update devices.
3990 check_system_chunk(trans
, extent_root
, flags
);
3992 ret
= btrfs_alloc_chunk(trans
, extent_root
, flags
);
3993 trans
->allocating_chunk
= false;
3995 spin_lock(&space_info
->lock
);
3996 if (ret
< 0 && ret
!= -ENOSPC
)
3999 space_info
->full
= 1;
4003 space_info
->force_alloc
= CHUNK_ALLOC_NO_FORCE
;
4005 space_info
->chunk_alloc
= 0;
4006 spin_unlock(&space_info
->lock
);
4007 mutex_unlock(&fs_info
->chunk_mutex
);
4011 static int can_overcommit(struct btrfs_root
*root
,
4012 struct btrfs_space_info
*space_info
, u64 bytes
,
4013 enum btrfs_reserve_flush_enum flush
)
4015 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
4016 u64 profile
= btrfs_get_alloc_profile(root
, 0);
4021 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4022 space_info
->bytes_pinned
+ space_info
->bytes_readonly
;
4025 * We only want to allow over committing if we have lots of actual space
4026 * free, but if we don't have enough space to handle the global reserve
4027 * space then we could end up having a real enospc problem when trying
4028 * to allocate a chunk or some other such important allocation.
4030 spin_lock(&global_rsv
->lock
);
4031 space_size
= calc_global_rsv_need_space(global_rsv
);
4032 spin_unlock(&global_rsv
->lock
);
4033 if (used
+ space_size
>= space_info
->total_bytes
)
4036 used
+= space_info
->bytes_may_use
;
4038 spin_lock(&root
->fs_info
->free_chunk_lock
);
4039 avail
= root
->fs_info
->free_chunk_space
;
4040 spin_unlock(&root
->fs_info
->free_chunk_lock
);
4043 * If we have dup, raid1 or raid10 then only half of the free
4044 * space is actually useable. For raid56, the space info used
4045 * doesn't include the parity drive, so we don't have to
4048 if (profile
& (BTRFS_BLOCK_GROUP_DUP
|
4049 BTRFS_BLOCK_GROUP_RAID1
|
4050 BTRFS_BLOCK_GROUP_RAID10
))
4054 * If we aren't flushing all things, let us overcommit up to
4055 * 1/2th of the space. If we can flush, don't let us overcommit
4056 * too much, let it overcommit up to 1/8 of the space.
4058 if (flush
== BTRFS_RESERVE_FLUSH_ALL
)
4063 if (used
+ bytes
< space_info
->total_bytes
+ avail
)
4068 static void btrfs_writeback_inodes_sb_nr(struct btrfs_root
*root
,
4069 unsigned long nr_pages
, int nr_items
)
4071 struct super_block
*sb
= root
->fs_info
->sb
;
4073 if (down_read_trylock(&sb
->s_umount
)) {
4074 writeback_inodes_sb_nr(sb
, nr_pages
, WB_REASON_FS_FREE_SPACE
);
4075 up_read(&sb
->s_umount
);
4078 * We needn't worry the filesystem going from r/w to r/o though
4079 * we don't acquire ->s_umount mutex, because the filesystem
4080 * should guarantee the delalloc inodes list be empty after
4081 * the filesystem is readonly(all dirty pages are written to
4084 btrfs_start_delalloc_roots(root
->fs_info
, 0, nr_items
);
4085 if (!current
->journal_info
)
4086 btrfs_wait_ordered_roots(root
->fs_info
, nr_items
);
4090 static inline int calc_reclaim_items_nr(struct btrfs_root
*root
, u64 to_reclaim
)
4095 bytes
= btrfs_calc_trans_metadata_size(root
, 1);
4096 nr
= (int)div64_u64(to_reclaim
, bytes
);
4102 #define EXTENT_SIZE_PER_ITEM (256 * 1024)
4105 * shrink metadata reservation for delalloc
4107 static void shrink_delalloc(struct btrfs_root
*root
, u64 to_reclaim
, u64 orig
,
4110 struct btrfs_block_rsv
*block_rsv
;
4111 struct btrfs_space_info
*space_info
;
4112 struct btrfs_trans_handle
*trans
;
4116 unsigned long nr_pages
;
4119 enum btrfs_reserve_flush_enum flush
;
4121 /* Calc the number of the pages we need flush for space reservation */
4122 items
= calc_reclaim_items_nr(root
, to_reclaim
);
4123 to_reclaim
= items
* EXTENT_SIZE_PER_ITEM
;
4125 trans
= (struct btrfs_trans_handle
*)current
->journal_info
;
4126 block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
4127 space_info
= block_rsv
->space_info
;
4129 delalloc_bytes
= percpu_counter_sum_positive(
4130 &root
->fs_info
->delalloc_bytes
);
4131 if (delalloc_bytes
== 0) {
4135 btrfs_wait_ordered_roots(root
->fs_info
, items
);
4140 while (delalloc_bytes
&& loops
< 3) {
4141 max_reclaim
= min(delalloc_bytes
, to_reclaim
);
4142 nr_pages
= max_reclaim
>> PAGE_CACHE_SHIFT
;
4143 btrfs_writeback_inodes_sb_nr(root
, nr_pages
, items
);
4145 * We need to wait for the async pages to actually start before
4148 max_reclaim
= atomic_read(&root
->fs_info
->async_delalloc_pages
);
4152 if (max_reclaim
<= nr_pages
)
4155 max_reclaim
-= nr_pages
;
4157 wait_event(root
->fs_info
->async_submit_wait
,
4158 atomic_read(&root
->fs_info
->async_delalloc_pages
) <=
4162 flush
= BTRFS_RESERVE_FLUSH_ALL
;
4164 flush
= BTRFS_RESERVE_NO_FLUSH
;
4165 spin_lock(&space_info
->lock
);
4166 if (can_overcommit(root
, space_info
, orig
, flush
)) {
4167 spin_unlock(&space_info
->lock
);
4170 spin_unlock(&space_info
->lock
);
4173 if (wait_ordered
&& !trans
) {
4174 btrfs_wait_ordered_roots(root
->fs_info
, items
);
4176 time_left
= schedule_timeout_killable(1);
4180 delalloc_bytes
= percpu_counter_sum_positive(
4181 &root
->fs_info
->delalloc_bytes
);
4186 * maybe_commit_transaction - possibly commit the transaction if its ok to
4187 * @root - the root we're allocating for
4188 * @bytes - the number of bytes we want to reserve
4189 * @force - force the commit
4191 * This will check to make sure that committing the transaction will actually
4192 * get us somewhere and then commit the transaction if it does. Otherwise it
4193 * will return -ENOSPC.
4195 static int may_commit_transaction(struct btrfs_root
*root
,
4196 struct btrfs_space_info
*space_info
,
4197 u64 bytes
, int force
)
4199 struct btrfs_block_rsv
*delayed_rsv
= &root
->fs_info
->delayed_block_rsv
;
4200 struct btrfs_trans_handle
*trans
;
4202 trans
= (struct btrfs_trans_handle
*)current
->journal_info
;
4209 /* See if there is enough pinned space to make this reservation */
4210 if (percpu_counter_compare(&space_info
->total_bytes_pinned
,
4215 * See if there is some space in the delayed insertion reservation for
4218 if (space_info
!= delayed_rsv
->space_info
)
4221 spin_lock(&delayed_rsv
->lock
);
4222 if (percpu_counter_compare(&space_info
->total_bytes_pinned
,
4223 bytes
- delayed_rsv
->size
) >= 0) {
4224 spin_unlock(&delayed_rsv
->lock
);
4227 spin_unlock(&delayed_rsv
->lock
);
4230 trans
= btrfs_join_transaction(root
);
4234 return btrfs_commit_transaction(trans
, root
);
4238 FLUSH_DELAYED_ITEMS_NR
= 1,
4239 FLUSH_DELAYED_ITEMS
= 2,
4241 FLUSH_DELALLOC_WAIT
= 4,
4246 static int flush_space(struct btrfs_root
*root
,
4247 struct btrfs_space_info
*space_info
, u64 num_bytes
,
4248 u64 orig_bytes
, int state
)
4250 struct btrfs_trans_handle
*trans
;
4255 case FLUSH_DELAYED_ITEMS_NR
:
4256 case FLUSH_DELAYED_ITEMS
:
4257 if (state
== FLUSH_DELAYED_ITEMS_NR
)
4258 nr
= calc_reclaim_items_nr(root
, num_bytes
) * 2;
4262 trans
= btrfs_join_transaction(root
);
4263 if (IS_ERR(trans
)) {
4264 ret
= PTR_ERR(trans
);
4267 ret
= btrfs_run_delayed_items_nr(trans
, root
, nr
);
4268 btrfs_end_transaction(trans
, root
);
4270 case FLUSH_DELALLOC
:
4271 case FLUSH_DELALLOC_WAIT
:
4272 shrink_delalloc(root
, num_bytes
* 2, orig_bytes
,
4273 state
== FLUSH_DELALLOC_WAIT
);
4276 trans
= btrfs_join_transaction(root
);
4277 if (IS_ERR(trans
)) {
4278 ret
= PTR_ERR(trans
);
4281 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
4282 btrfs_get_alloc_profile(root
, 0),
4283 CHUNK_ALLOC_NO_FORCE
);
4284 btrfs_end_transaction(trans
, root
);
4289 ret
= may_commit_transaction(root
, space_info
, orig_bytes
, 0);
4300 btrfs_calc_reclaim_metadata_size(struct btrfs_root
*root
,
4301 struct btrfs_space_info
*space_info
)
4307 to_reclaim
= min_t(u64
, num_online_cpus() * 1024 * 1024,
4309 spin_lock(&space_info
->lock
);
4310 if (can_overcommit(root
, space_info
, to_reclaim
,
4311 BTRFS_RESERVE_FLUSH_ALL
)) {
4316 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4317 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4318 space_info
->bytes_may_use
;
4319 if (can_overcommit(root
, space_info
, 1024 * 1024,
4320 BTRFS_RESERVE_FLUSH_ALL
))
4321 expected
= div_factor_fine(space_info
->total_bytes
, 95);
4323 expected
= div_factor_fine(space_info
->total_bytes
, 90);
4325 if (used
> expected
)
4326 to_reclaim
= used
- expected
;
4329 to_reclaim
= min(to_reclaim
, space_info
->bytes_may_use
+
4330 space_info
->bytes_reserved
);
4332 spin_unlock(&space_info
->lock
);
4337 static inline int need_do_async_reclaim(struct btrfs_space_info
*space_info
,
4338 struct btrfs_fs_info
*fs_info
, u64 used
)
4340 return (used
>= div_factor_fine(space_info
->total_bytes
, 98) &&
4341 !btrfs_fs_closing(fs_info
) &&
4342 !test_bit(BTRFS_FS_STATE_REMOUNTING
, &fs_info
->fs_state
));
4345 static int btrfs_need_do_async_reclaim(struct btrfs_space_info
*space_info
,
4346 struct btrfs_fs_info
*fs_info
,
4351 spin_lock(&space_info
->lock
);
4353 * We run out of space and have not got any free space via flush_space,
4354 * so don't bother doing async reclaim.
4356 if (flush_state
> COMMIT_TRANS
&& space_info
->full
) {
4357 spin_unlock(&space_info
->lock
);
4361 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4362 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4363 space_info
->bytes_may_use
;
4364 if (need_do_async_reclaim(space_info
, fs_info
, used
)) {
4365 spin_unlock(&space_info
->lock
);
4368 spin_unlock(&space_info
->lock
);
4373 static void btrfs_async_reclaim_metadata_space(struct work_struct
*work
)
4375 struct btrfs_fs_info
*fs_info
;
4376 struct btrfs_space_info
*space_info
;
4380 fs_info
= container_of(work
, struct btrfs_fs_info
, async_reclaim_work
);
4381 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4383 to_reclaim
= btrfs_calc_reclaim_metadata_size(fs_info
->fs_root
,
4388 flush_state
= FLUSH_DELAYED_ITEMS_NR
;
4390 flush_space(fs_info
->fs_root
, space_info
, to_reclaim
,
4391 to_reclaim
, flush_state
);
4393 if (!btrfs_need_do_async_reclaim(space_info
, fs_info
,
4396 } while (flush_state
<= COMMIT_TRANS
);
4398 if (btrfs_need_do_async_reclaim(space_info
, fs_info
, flush_state
))
4399 queue_work(system_unbound_wq
, work
);
4402 void btrfs_init_async_reclaim_work(struct work_struct
*work
)
4404 INIT_WORK(work
, btrfs_async_reclaim_metadata_space
);
4408 * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
4409 * @root - the root we're allocating for
4410 * @block_rsv - the block_rsv we're allocating for
4411 * @orig_bytes - the number of bytes we want
4412 * @flush - whether or not we can flush to make our reservation
4414 * This will reserve orgi_bytes number of bytes from the space info associated
4415 * with the block_rsv. If there is not enough space it will make an attempt to
4416 * flush out space to make room. It will do this by flushing delalloc if
4417 * possible or committing the transaction. If flush is 0 then no attempts to
4418 * regain reservations will be made and this will fail if there is not enough
4421 static int reserve_metadata_bytes(struct btrfs_root
*root
,
4422 struct btrfs_block_rsv
*block_rsv
,
4424 enum btrfs_reserve_flush_enum flush
)
4426 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
4428 u64 num_bytes
= orig_bytes
;
4429 int flush_state
= FLUSH_DELAYED_ITEMS_NR
;
4431 bool flushing
= false;
4435 spin_lock(&space_info
->lock
);
4437 * We only want to wait if somebody other than us is flushing and we
4438 * are actually allowed to flush all things.
4440 while (flush
== BTRFS_RESERVE_FLUSH_ALL
&& !flushing
&&
4441 space_info
->flush
) {
4442 spin_unlock(&space_info
->lock
);
4444 * If we have a trans handle we can't wait because the flusher
4445 * may have to commit the transaction, which would mean we would
4446 * deadlock since we are waiting for the flusher to finish, but
4447 * hold the current transaction open.
4449 if (current
->journal_info
)
4451 ret
= wait_event_killable(space_info
->wait
, !space_info
->flush
);
4452 /* Must have been killed, return */
4456 spin_lock(&space_info
->lock
);
4460 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4461 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4462 space_info
->bytes_may_use
;
4465 * The idea here is that we've not already over-reserved the block group
4466 * then we can go ahead and save our reservation first and then start
4467 * flushing if we need to. Otherwise if we've already overcommitted
4468 * lets start flushing stuff first and then come back and try to make
4471 if (used
<= space_info
->total_bytes
) {
4472 if (used
+ orig_bytes
<= space_info
->total_bytes
) {
4473 space_info
->bytes_may_use
+= orig_bytes
;
4474 trace_btrfs_space_reservation(root
->fs_info
,
4475 "space_info", space_info
->flags
, orig_bytes
, 1);
4479 * Ok set num_bytes to orig_bytes since we aren't
4480 * overocmmitted, this way we only try and reclaim what
4483 num_bytes
= orig_bytes
;
4487 * Ok we're over committed, set num_bytes to the overcommitted
4488 * amount plus the amount of bytes that we need for this
4491 num_bytes
= used
- space_info
->total_bytes
+
4495 if (ret
&& can_overcommit(root
, space_info
, orig_bytes
, flush
)) {
4496 space_info
->bytes_may_use
+= orig_bytes
;
4497 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
4498 space_info
->flags
, orig_bytes
,
4504 * Couldn't make our reservation, save our place so while we're trying
4505 * to reclaim space we can actually use it instead of somebody else
4506 * stealing it from us.
4508 * We make the other tasks wait for the flush only when we can flush
4511 if (ret
&& flush
!= BTRFS_RESERVE_NO_FLUSH
) {
4513 space_info
->flush
= 1;
4514 } else if (!ret
&& space_info
->flags
& BTRFS_BLOCK_GROUP_METADATA
) {
4517 * We will do the space reservation dance during log replay,
4518 * which means we won't have fs_info->fs_root set, so don't do
4519 * the async reclaim as we will panic.
4521 if (!root
->fs_info
->log_root_recovering
&&
4522 need_do_async_reclaim(space_info
, root
->fs_info
, used
) &&
4523 !work_busy(&root
->fs_info
->async_reclaim_work
))
4524 queue_work(system_unbound_wq
,
4525 &root
->fs_info
->async_reclaim_work
);
4527 spin_unlock(&space_info
->lock
);
4529 if (!ret
|| flush
== BTRFS_RESERVE_NO_FLUSH
)
4532 ret
= flush_space(root
, space_info
, num_bytes
, orig_bytes
,
4537 * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock
4538 * would happen. So skip delalloc flush.
4540 if (flush
== BTRFS_RESERVE_FLUSH_LIMIT
&&
4541 (flush_state
== FLUSH_DELALLOC
||
4542 flush_state
== FLUSH_DELALLOC_WAIT
))
4543 flush_state
= ALLOC_CHUNK
;
4547 else if (flush
== BTRFS_RESERVE_FLUSH_LIMIT
&&
4548 flush_state
< COMMIT_TRANS
)
4550 else if (flush
== BTRFS_RESERVE_FLUSH_ALL
&&
4551 flush_state
<= COMMIT_TRANS
)
4555 if (ret
== -ENOSPC
&&
4556 unlikely(root
->orphan_cleanup_state
== ORPHAN_CLEANUP_STARTED
)) {
4557 struct btrfs_block_rsv
*global_rsv
=
4558 &root
->fs_info
->global_block_rsv
;
4560 if (block_rsv
!= global_rsv
&&
4561 !block_rsv_use_bytes(global_rsv
, orig_bytes
))
4565 trace_btrfs_space_reservation(root
->fs_info
,
4566 "space_info:enospc",
4567 space_info
->flags
, orig_bytes
, 1);
4569 spin_lock(&space_info
->lock
);
4570 space_info
->flush
= 0;
4571 wake_up_all(&space_info
->wait
);
4572 spin_unlock(&space_info
->lock
);
4577 static struct btrfs_block_rsv
*get_block_rsv(
4578 const struct btrfs_trans_handle
*trans
,
4579 const struct btrfs_root
*root
)
4581 struct btrfs_block_rsv
*block_rsv
= NULL
;
4583 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
4584 block_rsv
= trans
->block_rsv
;
4586 if (root
== root
->fs_info
->csum_root
&& trans
->adding_csums
)
4587 block_rsv
= trans
->block_rsv
;
4589 if (root
== root
->fs_info
->uuid_root
)
4590 block_rsv
= trans
->block_rsv
;
4593 block_rsv
= root
->block_rsv
;
4596 block_rsv
= &root
->fs_info
->empty_block_rsv
;
4601 static int block_rsv_use_bytes(struct btrfs_block_rsv
*block_rsv
,
4605 spin_lock(&block_rsv
->lock
);
4606 if (block_rsv
->reserved
>= num_bytes
) {
4607 block_rsv
->reserved
-= num_bytes
;
4608 if (block_rsv
->reserved
< block_rsv
->size
)
4609 block_rsv
->full
= 0;
4612 spin_unlock(&block_rsv
->lock
);
4616 static void block_rsv_add_bytes(struct btrfs_block_rsv
*block_rsv
,
4617 u64 num_bytes
, int update_size
)
4619 spin_lock(&block_rsv
->lock
);
4620 block_rsv
->reserved
+= num_bytes
;
4622 block_rsv
->size
+= num_bytes
;
4623 else if (block_rsv
->reserved
>= block_rsv
->size
)
4624 block_rsv
->full
= 1;
4625 spin_unlock(&block_rsv
->lock
);
4628 int btrfs_cond_migrate_bytes(struct btrfs_fs_info
*fs_info
,
4629 struct btrfs_block_rsv
*dest
, u64 num_bytes
,
4632 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
4635 if (global_rsv
->space_info
!= dest
->space_info
)
4638 spin_lock(&global_rsv
->lock
);
4639 min_bytes
= div_factor(global_rsv
->size
, min_factor
);
4640 if (global_rsv
->reserved
< min_bytes
+ num_bytes
) {
4641 spin_unlock(&global_rsv
->lock
);
4644 global_rsv
->reserved
-= num_bytes
;
4645 if (global_rsv
->reserved
< global_rsv
->size
)
4646 global_rsv
->full
= 0;
4647 spin_unlock(&global_rsv
->lock
);
4649 block_rsv_add_bytes(dest
, num_bytes
, 1);
4653 static void block_rsv_release_bytes(struct btrfs_fs_info
*fs_info
,
4654 struct btrfs_block_rsv
*block_rsv
,
4655 struct btrfs_block_rsv
*dest
, u64 num_bytes
)
4657 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
4659 spin_lock(&block_rsv
->lock
);
4660 if (num_bytes
== (u64
)-1)
4661 num_bytes
= block_rsv
->size
;
4662 block_rsv
->size
-= num_bytes
;
4663 if (block_rsv
->reserved
>= block_rsv
->size
) {
4664 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
4665 block_rsv
->reserved
= block_rsv
->size
;
4666 block_rsv
->full
= 1;
4670 spin_unlock(&block_rsv
->lock
);
4672 if (num_bytes
> 0) {
4674 spin_lock(&dest
->lock
);
4678 bytes_to_add
= dest
->size
- dest
->reserved
;
4679 bytes_to_add
= min(num_bytes
, bytes_to_add
);
4680 dest
->reserved
+= bytes_to_add
;
4681 if (dest
->reserved
>= dest
->size
)
4683 num_bytes
-= bytes_to_add
;
4685 spin_unlock(&dest
->lock
);
4688 spin_lock(&space_info
->lock
);
4689 space_info
->bytes_may_use
-= num_bytes
;
4690 trace_btrfs_space_reservation(fs_info
, "space_info",
4691 space_info
->flags
, num_bytes
, 0);
4692 spin_unlock(&space_info
->lock
);
4697 static int block_rsv_migrate_bytes(struct btrfs_block_rsv
*src
,
4698 struct btrfs_block_rsv
*dst
, u64 num_bytes
)
4702 ret
= block_rsv_use_bytes(src
, num_bytes
);
4706 block_rsv_add_bytes(dst
, num_bytes
, 1);
4710 void btrfs_init_block_rsv(struct btrfs_block_rsv
*rsv
, unsigned short type
)
4712 memset(rsv
, 0, sizeof(*rsv
));
4713 spin_lock_init(&rsv
->lock
);
4717 struct btrfs_block_rsv
*btrfs_alloc_block_rsv(struct btrfs_root
*root
,
4718 unsigned short type
)
4720 struct btrfs_block_rsv
*block_rsv
;
4721 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4723 block_rsv
= kmalloc(sizeof(*block_rsv
), GFP_NOFS
);
4727 btrfs_init_block_rsv(block_rsv
, type
);
4728 block_rsv
->space_info
= __find_space_info(fs_info
,
4729 BTRFS_BLOCK_GROUP_METADATA
);
4733 void btrfs_free_block_rsv(struct btrfs_root
*root
,
4734 struct btrfs_block_rsv
*rsv
)
4738 btrfs_block_rsv_release(root
, rsv
, (u64
)-1);
4742 int btrfs_block_rsv_add(struct btrfs_root
*root
,
4743 struct btrfs_block_rsv
*block_rsv
, u64 num_bytes
,
4744 enum btrfs_reserve_flush_enum flush
)
4751 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
4753 block_rsv_add_bytes(block_rsv
, num_bytes
, 1);
4760 int btrfs_block_rsv_check(struct btrfs_root
*root
,
4761 struct btrfs_block_rsv
*block_rsv
, int min_factor
)
4769 spin_lock(&block_rsv
->lock
);
4770 num_bytes
= div_factor(block_rsv
->size
, min_factor
);
4771 if (block_rsv
->reserved
>= num_bytes
)
4773 spin_unlock(&block_rsv
->lock
);
4778 int btrfs_block_rsv_refill(struct btrfs_root
*root
,
4779 struct btrfs_block_rsv
*block_rsv
, u64 min_reserved
,
4780 enum btrfs_reserve_flush_enum flush
)
4788 spin_lock(&block_rsv
->lock
);
4789 num_bytes
= min_reserved
;
4790 if (block_rsv
->reserved
>= num_bytes
)
4793 num_bytes
-= block_rsv
->reserved
;
4794 spin_unlock(&block_rsv
->lock
);
4799 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
4801 block_rsv_add_bytes(block_rsv
, num_bytes
, 0);
4808 int btrfs_block_rsv_migrate(struct btrfs_block_rsv
*src_rsv
,
4809 struct btrfs_block_rsv
*dst_rsv
,
4812 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
4815 void btrfs_block_rsv_release(struct btrfs_root
*root
,
4816 struct btrfs_block_rsv
*block_rsv
,
4819 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
4820 if (global_rsv
== block_rsv
||
4821 block_rsv
->space_info
!= global_rsv
->space_info
)
4823 block_rsv_release_bytes(root
->fs_info
, block_rsv
, global_rsv
,
4828 * helper to calculate size of global block reservation.
4829 * the desired value is sum of space used by extent tree,
4830 * checksum tree and root tree
4832 static u64
calc_global_metadata_size(struct btrfs_fs_info
*fs_info
)
4834 struct btrfs_space_info
*sinfo
;
4838 int csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
4840 sinfo
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_DATA
);
4841 spin_lock(&sinfo
->lock
);
4842 data_used
= sinfo
->bytes_used
;
4843 spin_unlock(&sinfo
->lock
);
4845 sinfo
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4846 spin_lock(&sinfo
->lock
);
4847 if (sinfo
->flags
& BTRFS_BLOCK_GROUP_DATA
)
4849 meta_used
= sinfo
->bytes_used
;
4850 spin_unlock(&sinfo
->lock
);
4852 num_bytes
= (data_used
>> fs_info
->sb
->s_blocksize_bits
) *
4854 num_bytes
+= div64_u64(data_used
+ meta_used
, 50);
4856 if (num_bytes
* 3 > meta_used
)
4857 num_bytes
= div64_u64(meta_used
, 3);
4859 return ALIGN(num_bytes
, fs_info
->extent_root
->nodesize
<< 10);
4862 static void update_global_block_rsv(struct btrfs_fs_info
*fs_info
)
4864 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
4865 struct btrfs_space_info
*sinfo
= block_rsv
->space_info
;
4868 num_bytes
= calc_global_metadata_size(fs_info
);
4870 spin_lock(&sinfo
->lock
);
4871 spin_lock(&block_rsv
->lock
);
4873 block_rsv
->size
= min_t(u64
, num_bytes
, 512 * 1024 * 1024);
4875 num_bytes
= sinfo
->bytes_used
+ sinfo
->bytes_pinned
+
4876 sinfo
->bytes_reserved
+ sinfo
->bytes_readonly
+
4877 sinfo
->bytes_may_use
;
4879 if (sinfo
->total_bytes
> num_bytes
) {
4880 num_bytes
= sinfo
->total_bytes
- num_bytes
;
4881 block_rsv
->reserved
+= num_bytes
;
4882 sinfo
->bytes_may_use
+= num_bytes
;
4883 trace_btrfs_space_reservation(fs_info
, "space_info",
4884 sinfo
->flags
, num_bytes
, 1);
4887 if (block_rsv
->reserved
>= block_rsv
->size
) {
4888 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
4889 sinfo
->bytes_may_use
-= num_bytes
;
4890 trace_btrfs_space_reservation(fs_info
, "space_info",
4891 sinfo
->flags
, num_bytes
, 0);
4892 block_rsv
->reserved
= block_rsv
->size
;
4893 block_rsv
->full
= 1;
4896 spin_unlock(&block_rsv
->lock
);
4897 spin_unlock(&sinfo
->lock
);
4900 static void init_global_block_rsv(struct btrfs_fs_info
*fs_info
)
4902 struct btrfs_space_info
*space_info
;
4904 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
4905 fs_info
->chunk_block_rsv
.space_info
= space_info
;
4907 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4908 fs_info
->global_block_rsv
.space_info
= space_info
;
4909 fs_info
->delalloc_block_rsv
.space_info
= space_info
;
4910 fs_info
->trans_block_rsv
.space_info
= space_info
;
4911 fs_info
->empty_block_rsv
.space_info
= space_info
;
4912 fs_info
->delayed_block_rsv
.space_info
= space_info
;
4914 fs_info
->extent_root
->block_rsv
= &fs_info
->global_block_rsv
;
4915 fs_info
->csum_root
->block_rsv
= &fs_info
->global_block_rsv
;
4916 fs_info
->dev_root
->block_rsv
= &fs_info
->global_block_rsv
;
4917 fs_info
->tree_root
->block_rsv
= &fs_info
->global_block_rsv
;
4918 if (fs_info
->quota_root
)
4919 fs_info
->quota_root
->block_rsv
= &fs_info
->global_block_rsv
;
4920 fs_info
->chunk_root
->block_rsv
= &fs_info
->chunk_block_rsv
;
4922 update_global_block_rsv(fs_info
);
4925 static void release_global_block_rsv(struct btrfs_fs_info
*fs_info
)
4927 block_rsv_release_bytes(fs_info
, &fs_info
->global_block_rsv
, NULL
,
4929 WARN_ON(fs_info
->delalloc_block_rsv
.size
> 0);
4930 WARN_ON(fs_info
->delalloc_block_rsv
.reserved
> 0);
4931 WARN_ON(fs_info
->trans_block_rsv
.size
> 0);
4932 WARN_ON(fs_info
->trans_block_rsv
.reserved
> 0);
4933 WARN_ON(fs_info
->chunk_block_rsv
.size
> 0);
4934 WARN_ON(fs_info
->chunk_block_rsv
.reserved
> 0);
4935 WARN_ON(fs_info
->delayed_block_rsv
.size
> 0);
4936 WARN_ON(fs_info
->delayed_block_rsv
.reserved
> 0);
4939 void btrfs_trans_release_metadata(struct btrfs_trans_handle
*trans
,
4940 struct btrfs_root
*root
)
4942 if (!trans
->block_rsv
)
4945 if (!trans
->bytes_reserved
)
4948 trace_btrfs_space_reservation(root
->fs_info
, "transaction",
4949 trans
->transid
, trans
->bytes_reserved
, 0);
4950 btrfs_block_rsv_release(root
, trans
->block_rsv
, trans
->bytes_reserved
);
4951 trans
->bytes_reserved
= 0;
4954 /* Can only return 0 or -ENOSPC */
4955 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle
*trans
,
4956 struct inode
*inode
)
4958 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4959 struct btrfs_block_rsv
*src_rsv
= get_block_rsv(trans
, root
);
4960 struct btrfs_block_rsv
*dst_rsv
= root
->orphan_block_rsv
;
4963 * We need to hold space in order to delete our orphan item once we've
4964 * added it, so this takes the reservation so we can release it later
4965 * when we are truly done with the orphan item.
4967 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
4968 trace_btrfs_space_reservation(root
->fs_info
, "orphan",
4969 btrfs_ino(inode
), num_bytes
, 1);
4970 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
4973 void btrfs_orphan_release_metadata(struct inode
*inode
)
4975 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4976 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
4977 trace_btrfs_space_reservation(root
->fs_info
, "orphan",
4978 btrfs_ino(inode
), num_bytes
, 0);
4979 btrfs_block_rsv_release(root
, root
->orphan_block_rsv
, num_bytes
);
4983 * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation
4984 * root: the root of the parent directory
4985 * rsv: block reservation
4986 * items: the number of items that we need do reservation
4987 * qgroup_reserved: used to return the reserved size in qgroup
4989 * This function is used to reserve the space for snapshot/subvolume
4990 * creation and deletion. Those operations are different with the
4991 * common file/directory operations, they change two fs/file trees
4992 * and root tree, the number of items that the qgroup reserves is
4993 * different with the free space reservation. So we can not use
4994 * the space reseravtion mechanism in start_transaction().
4996 int btrfs_subvolume_reserve_metadata(struct btrfs_root
*root
,
4997 struct btrfs_block_rsv
*rsv
,
4999 u64
*qgroup_reserved
,
5000 bool use_global_rsv
)
5004 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
5006 if (root
->fs_info
->quota_enabled
) {
5007 /* One for parent inode, two for dir entries */
5008 num_bytes
= 3 * root
->nodesize
;
5009 ret
= btrfs_qgroup_reserve(root
, num_bytes
);
5016 *qgroup_reserved
= num_bytes
;
5018 num_bytes
= btrfs_calc_trans_metadata_size(root
, items
);
5019 rsv
->space_info
= __find_space_info(root
->fs_info
,
5020 BTRFS_BLOCK_GROUP_METADATA
);
5021 ret
= btrfs_block_rsv_add(root
, rsv
, num_bytes
,
5022 BTRFS_RESERVE_FLUSH_ALL
);
5024 if (ret
== -ENOSPC
&& use_global_rsv
)
5025 ret
= btrfs_block_rsv_migrate(global_rsv
, rsv
, num_bytes
);
5028 if (*qgroup_reserved
)
5029 btrfs_qgroup_free(root
, *qgroup_reserved
);
5035 void btrfs_subvolume_release_metadata(struct btrfs_root
*root
,
5036 struct btrfs_block_rsv
*rsv
,
5037 u64 qgroup_reserved
)
5039 btrfs_block_rsv_release(root
, rsv
, (u64
)-1);
5040 if (qgroup_reserved
)
5041 btrfs_qgroup_free(root
, qgroup_reserved
);
5045 * drop_outstanding_extent - drop an outstanding extent
5046 * @inode: the inode we're dropping the extent for
5048 * This is called when we are freeing up an outstanding extent, either called
5049 * after an error or after an extent is written. This will return the number of
5050 * reserved extents that need to be freed. This must be called with
5051 * BTRFS_I(inode)->lock held.
5053 static unsigned drop_outstanding_extent(struct inode
*inode
)
5055 unsigned drop_inode_space
= 0;
5056 unsigned dropped_extents
= 0;
5058 BUG_ON(!BTRFS_I(inode
)->outstanding_extents
);
5059 BTRFS_I(inode
)->outstanding_extents
--;
5061 if (BTRFS_I(inode
)->outstanding_extents
== 0 &&
5062 test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5063 &BTRFS_I(inode
)->runtime_flags
))
5064 drop_inode_space
= 1;
5067 * If we have more or the same amount of outsanding extents than we have
5068 * reserved then we need to leave the reserved extents count alone.
5070 if (BTRFS_I(inode
)->outstanding_extents
>=
5071 BTRFS_I(inode
)->reserved_extents
)
5072 return drop_inode_space
;
5074 dropped_extents
= BTRFS_I(inode
)->reserved_extents
-
5075 BTRFS_I(inode
)->outstanding_extents
;
5076 BTRFS_I(inode
)->reserved_extents
-= dropped_extents
;
5077 return dropped_extents
+ drop_inode_space
;
5081 * calc_csum_metadata_size - return the amount of metada space that must be
5082 * reserved/free'd for the given bytes.
5083 * @inode: the inode we're manipulating
5084 * @num_bytes: the number of bytes in question
5085 * @reserve: 1 if we are reserving space, 0 if we are freeing space
5087 * This adjusts the number of csum_bytes in the inode and then returns the
5088 * correct amount of metadata that must either be reserved or freed. We
5089 * calculate how many checksums we can fit into one leaf and then divide the
5090 * number of bytes that will need to be checksumed by this value to figure out
5091 * how many checksums will be required. If we are adding bytes then the number
5092 * may go up and we will return the number of additional bytes that must be
5093 * reserved. If it is going down we will return the number of bytes that must
5096 * This must be called with BTRFS_I(inode)->lock held.
5098 static u64
calc_csum_metadata_size(struct inode
*inode
, u64 num_bytes
,
5101 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5103 int num_csums_per_leaf
;
5107 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
&&
5108 BTRFS_I(inode
)->csum_bytes
== 0)
5111 old_csums
= (int)div64_u64(BTRFS_I(inode
)->csum_bytes
, root
->sectorsize
);
5113 BTRFS_I(inode
)->csum_bytes
+= num_bytes
;
5115 BTRFS_I(inode
)->csum_bytes
-= num_bytes
;
5116 csum_size
= BTRFS_LEAF_DATA_SIZE(root
) - sizeof(struct btrfs_item
);
5117 num_csums_per_leaf
= (int)div64_u64(csum_size
,
5118 sizeof(struct btrfs_csum_item
) +
5119 sizeof(struct btrfs_disk_key
));
5120 num_csums
= (int)div64_u64(BTRFS_I(inode
)->csum_bytes
, root
->sectorsize
);
5121 num_csums
= num_csums
+ num_csums_per_leaf
- 1;
5122 num_csums
= num_csums
/ num_csums_per_leaf
;
5124 old_csums
= old_csums
+ num_csums_per_leaf
- 1;
5125 old_csums
= old_csums
/ num_csums_per_leaf
;
5127 /* No change, no need to reserve more */
5128 if (old_csums
== num_csums
)
5132 return btrfs_calc_trans_metadata_size(root
,
5133 num_csums
- old_csums
);
5135 return btrfs_calc_trans_metadata_size(root
, old_csums
- num_csums
);
5138 int btrfs_delalloc_reserve_metadata(struct inode
*inode
, u64 num_bytes
)
5140 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5141 struct btrfs_block_rsv
*block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
5144 unsigned nr_extents
= 0;
5145 int extra_reserve
= 0;
5146 enum btrfs_reserve_flush_enum flush
= BTRFS_RESERVE_FLUSH_ALL
;
5148 bool delalloc_lock
= true;
5152 /* If we are a free space inode we need to not flush since we will be in
5153 * the middle of a transaction commit. We also don't need the delalloc
5154 * mutex since we won't race with anybody. We need this mostly to make
5155 * lockdep shut its filthy mouth.
5157 if (btrfs_is_free_space_inode(inode
)) {
5158 flush
= BTRFS_RESERVE_NO_FLUSH
;
5159 delalloc_lock
= false;
5162 if (flush
!= BTRFS_RESERVE_NO_FLUSH
&&
5163 btrfs_transaction_in_commit(root
->fs_info
))
5164 schedule_timeout(1);
5167 mutex_lock(&BTRFS_I(inode
)->delalloc_mutex
);
5169 num_bytes
= ALIGN(num_bytes
, root
->sectorsize
);
5171 spin_lock(&BTRFS_I(inode
)->lock
);
5172 BTRFS_I(inode
)->outstanding_extents
++;
5174 if (BTRFS_I(inode
)->outstanding_extents
>
5175 BTRFS_I(inode
)->reserved_extents
)
5176 nr_extents
= BTRFS_I(inode
)->outstanding_extents
-
5177 BTRFS_I(inode
)->reserved_extents
;
5180 * Add an item to reserve for updating the inode when we complete the
5183 if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5184 &BTRFS_I(inode
)->runtime_flags
)) {
5189 to_reserve
= btrfs_calc_trans_metadata_size(root
, nr_extents
);
5190 to_reserve
+= calc_csum_metadata_size(inode
, num_bytes
, 1);
5191 csum_bytes
= BTRFS_I(inode
)->csum_bytes
;
5192 spin_unlock(&BTRFS_I(inode
)->lock
);
5194 if (root
->fs_info
->quota_enabled
) {
5195 ret
= btrfs_qgroup_reserve(root
, num_bytes
+
5196 nr_extents
* root
->nodesize
);
5201 ret
= reserve_metadata_bytes(root
, block_rsv
, to_reserve
, flush
);
5202 if (unlikely(ret
)) {
5203 if (root
->fs_info
->quota_enabled
)
5204 btrfs_qgroup_free(root
, num_bytes
+
5205 nr_extents
* root
->nodesize
);
5209 spin_lock(&BTRFS_I(inode
)->lock
);
5210 if (extra_reserve
) {
5211 set_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5212 &BTRFS_I(inode
)->runtime_flags
);
5215 BTRFS_I(inode
)->reserved_extents
+= nr_extents
;
5216 spin_unlock(&BTRFS_I(inode
)->lock
);
5219 mutex_unlock(&BTRFS_I(inode
)->delalloc_mutex
);
5222 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5223 btrfs_ino(inode
), to_reserve
, 1);
5224 block_rsv_add_bytes(block_rsv
, to_reserve
, 1);
5229 spin_lock(&BTRFS_I(inode
)->lock
);
5230 dropped
= drop_outstanding_extent(inode
);
5232 * If the inodes csum_bytes is the same as the original
5233 * csum_bytes then we know we haven't raced with any free()ers
5234 * so we can just reduce our inodes csum bytes and carry on.
5236 if (BTRFS_I(inode
)->csum_bytes
== csum_bytes
) {
5237 calc_csum_metadata_size(inode
, num_bytes
, 0);
5239 u64 orig_csum_bytes
= BTRFS_I(inode
)->csum_bytes
;
5243 * This is tricky, but first we need to figure out how much we
5244 * free'd from any free-ers that occured during this
5245 * reservation, so we reset ->csum_bytes to the csum_bytes
5246 * before we dropped our lock, and then call the free for the
5247 * number of bytes that were freed while we were trying our
5250 bytes
= csum_bytes
- BTRFS_I(inode
)->csum_bytes
;
5251 BTRFS_I(inode
)->csum_bytes
= csum_bytes
;
5252 to_free
= calc_csum_metadata_size(inode
, bytes
, 0);
5256 * Now we need to see how much we would have freed had we not
5257 * been making this reservation and our ->csum_bytes were not
5258 * artificially inflated.
5260 BTRFS_I(inode
)->csum_bytes
= csum_bytes
- num_bytes
;
5261 bytes
= csum_bytes
- orig_csum_bytes
;
5262 bytes
= calc_csum_metadata_size(inode
, bytes
, 0);
5265 * Now reset ->csum_bytes to what it should be. If bytes is
5266 * more than to_free then we would have free'd more space had we
5267 * not had an artificially high ->csum_bytes, so we need to free
5268 * the remainder. If bytes is the same or less then we don't
5269 * need to do anything, the other free-ers did the correct
5272 BTRFS_I(inode
)->csum_bytes
= orig_csum_bytes
- num_bytes
;
5273 if (bytes
> to_free
)
5274 to_free
= bytes
- to_free
;
5278 spin_unlock(&BTRFS_I(inode
)->lock
);
5280 to_free
+= btrfs_calc_trans_metadata_size(root
, dropped
);
5283 btrfs_block_rsv_release(root
, block_rsv
, to_free
);
5284 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5285 btrfs_ino(inode
), to_free
, 0);
5288 mutex_unlock(&BTRFS_I(inode
)->delalloc_mutex
);
5293 * btrfs_delalloc_release_metadata - release a metadata reservation for an inode
5294 * @inode: the inode to release the reservation for
5295 * @num_bytes: the number of bytes we're releasing
5297 * This will release the metadata reservation for an inode. This can be called
5298 * once we complete IO for a given set of bytes to release their metadata
5301 void btrfs_delalloc_release_metadata(struct inode
*inode
, u64 num_bytes
)
5303 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5307 num_bytes
= ALIGN(num_bytes
, root
->sectorsize
);
5308 spin_lock(&BTRFS_I(inode
)->lock
);
5309 dropped
= drop_outstanding_extent(inode
);
5312 to_free
= calc_csum_metadata_size(inode
, num_bytes
, 0);
5313 spin_unlock(&BTRFS_I(inode
)->lock
);
5315 to_free
+= btrfs_calc_trans_metadata_size(root
, dropped
);
5317 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5318 btrfs_ino(inode
), to_free
, 0);
5319 if (root
->fs_info
->quota_enabled
) {
5320 btrfs_qgroup_free(root
, num_bytes
+
5321 dropped
* root
->nodesize
);
5324 btrfs_block_rsv_release(root
, &root
->fs_info
->delalloc_block_rsv
,
5329 * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc
5330 * @inode: inode we're writing to
5331 * @num_bytes: the number of bytes we want to allocate
5333 * This will do the following things
5335 * o reserve space in the data space info for num_bytes
5336 * o reserve space in the metadata space info based on number of outstanding
5337 * extents and how much csums will be needed
5338 * o add to the inodes ->delalloc_bytes
5339 * o add it to the fs_info's delalloc inodes list.
5341 * This will return 0 for success and -ENOSPC if there is no space left.
5343 int btrfs_delalloc_reserve_space(struct inode
*inode
, u64 num_bytes
)
5347 ret
= btrfs_check_data_free_space(inode
, num_bytes
);
5351 ret
= btrfs_delalloc_reserve_metadata(inode
, num_bytes
);
5353 btrfs_free_reserved_data_space(inode
, num_bytes
);
5361 * btrfs_delalloc_release_space - release data and metadata space for delalloc
5362 * @inode: inode we're releasing space for
5363 * @num_bytes: the number of bytes we want to free up
5365 * This must be matched with a call to btrfs_delalloc_reserve_space. This is
5366 * called in the case that we don't need the metadata AND data reservations
5367 * anymore. So if there is an error or we insert an inline extent.
5369 * This function will release the metadata space that was not used and will
5370 * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes
5371 * list if there are no delalloc bytes left.
5373 void btrfs_delalloc_release_space(struct inode
*inode
, u64 num_bytes
)
5375 btrfs_delalloc_release_metadata(inode
, num_bytes
);
5376 btrfs_free_reserved_data_space(inode
, num_bytes
);
5379 static int update_block_group(struct btrfs_root
*root
,
5380 u64 bytenr
, u64 num_bytes
, int alloc
)
5382 struct btrfs_block_group_cache
*cache
= NULL
;
5383 struct btrfs_fs_info
*info
= root
->fs_info
;
5384 u64 total
= num_bytes
;
5389 /* block accounting for super block */
5390 spin_lock(&info
->delalloc_root_lock
);
5391 old_val
= btrfs_super_bytes_used(info
->super_copy
);
5393 old_val
+= num_bytes
;
5395 old_val
-= num_bytes
;
5396 btrfs_set_super_bytes_used(info
->super_copy
, old_val
);
5397 spin_unlock(&info
->delalloc_root_lock
);
5400 cache
= btrfs_lookup_block_group(info
, bytenr
);
5403 if (cache
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
5404 BTRFS_BLOCK_GROUP_RAID1
|
5405 BTRFS_BLOCK_GROUP_RAID10
))
5410 * If this block group has free space cache written out, we
5411 * need to make sure to load it if we are removing space. This
5412 * is because we need the unpinning stage to actually add the
5413 * space back to the block group, otherwise we will leak space.
5415 if (!alloc
&& cache
->cached
== BTRFS_CACHE_NO
)
5416 cache_block_group(cache
, 1);
5418 byte_in_group
= bytenr
- cache
->key
.objectid
;
5419 WARN_ON(byte_in_group
> cache
->key
.offset
);
5421 spin_lock(&cache
->space_info
->lock
);
5422 spin_lock(&cache
->lock
);
5424 if (btrfs_test_opt(root
, SPACE_CACHE
) &&
5425 cache
->disk_cache_state
< BTRFS_DC_CLEAR
)
5426 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
5429 old_val
= btrfs_block_group_used(&cache
->item
);
5430 num_bytes
= min(total
, cache
->key
.offset
- byte_in_group
);
5432 old_val
+= num_bytes
;
5433 btrfs_set_block_group_used(&cache
->item
, old_val
);
5434 cache
->reserved
-= num_bytes
;
5435 cache
->space_info
->bytes_reserved
-= num_bytes
;
5436 cache
->space_info
->bytes_used
+= num_bytes
;
5437 cache
->space_info
->disk_used
+= num_bytes
* factor
;
5438 spin_unlock(&cache
->lock
);
5439 spin_unlock(&cache
->space_info
->lock
);
5441 old_val
-= num_bytes
;
5444 * No longer have used bytes in this block group, queue
5448 spin_lock(&info
->unused_bgs_lock
);
5449 if (list_empty(&cache
->bg_list
)) {
5450 btrfs_get_block_group(cache
);
5451 list_add_tail(&cache
->bg_list
,
5454 spin_unlock(&info
->unused_bgs_lock
);
5456 btrfs_set_block_group_used(&cache
->item
, old_val
);
5457 cache
->pinned
+= num_bytes
;
5458 cache
->space_info
->bytes_pinned
+= num_bytes
;
5459 cache
->space_info
->bytes_used
-= num_bytes
;
5460 cache
->space_info
->disk_used
-= num_bytes
* factor
;
5461 spin_unlock(&cache
->lock
);
5462 spin_unlock(&cache
->space_info
->lock
);
5464 set_extent_dirty(info
->pinned_extents
,
5465 bytenr
, bytenr
+ num_bytes
- 1,
5466 GFP_NOFS
| __GFP_NOFAIL
);
5468 btrfs_put_block_group(cache
);
5470 bytenr
+= num_bytes
;
5475 static u64
first_logical_byte(struct btrfs_root
*root
, u64 search_start
)
5477 struct btrfs_block_group_cache
*cache
;
5480 spin_lock(&root
->fs_info
->block_group_cache_lock
);
5481 bytenr
= root
->fs_info
->first_logical_byte
;
5482 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
5484 if (bytenr
< (u64
)-1)
5487 cache
= btrfs_lookup_first_block_group(root
->fs_info
, search_start
);
5491 bytenr
= cache
->key
.objectid
;
5492 btrfs_put_block_group(cache
);
5497 static int pin_down_extent(struct btrfs_root
*root
,
5498 struct btrfs_block_group_cache
*cache
,
5499 u64 bytenr
, u64 num_bytes
, int reserved
)
5501 spin_lock(&cache
->space_info
->lock
);
5502 spin_lock(&cache
->lock
);
5503 cache
->pinned
+= num_bytes
;
5504 cache
->space_info
->bytes_pinned
+= num_bytes
;
5506 cache
->reserved
-= num_bytes
;
5507 cache
->space_info
->bytes_reserved
-= num_bytes
;
5509 spin_unlock(&cache
->lock
);
5510 spin_unlock(&cache
->space_info
->lock
);
5512 set_extent_dirty(root
->fs_info
->pinned_extents
, bytenr
,
5513 bytenr
+ num_bytes
- 1, GFP_NOFS
| __GFP_NOFAIL
);
5515 trace_btrfs_reserved_extent_free(root
, bytenr
, num_bytes
);
5520 * this function must be called within transaction
5522 int btrfs_pin_extent(struct btrfs_root
*root
,
5523 u64 bytenr
, u64 num_bytes
, int reserved
)
5525 struct btrfs_block_group_cache
*cache
;
5527 cache
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
5528 BUG_ON(!cache
); /* Logic error */
5530 pin_down_extent(root
, cache
, bytenr
, num_bytes
, reserved
);
5532 btrfs_put_block_group(cache
);
5537 * this function must be called within transaction
5539 int btrfs_pin_extent_for_log_replay(struct btrfs_root
*root
,
5540 u64 bytenr
, u64 num_bytes
)
5542 struct btrfs_block_group_cache
*cache
;
5545 cache
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
5550 * pull in the free space cache (if any) so that our pin
5551 * removes the free space from the cache. We have load_only set
5552 * to one because the slow code to read in the free extents does check
5553 * the pinned extents.
5555 cache_block_group(cache
, 1);
5557 pin_down_extent(root
, cache
, bytenr
, num_bytes
, 0);
5559 /* remove us from the free space cache (if we're there at all) */
5560 ret
= btrfs_remove_free_space(cache
, bytenr
, num_bytes
);
5561 btrfs_put_block_group(cache
);
5565 static int __exclude_logged_extent(struct btrfs_root
*root
, u64 start
, u64 num_bytes
)
5568 struct btrfs_block_group_cache
*block_group
;
5569 struct btrfs_caching_control
*caching_ctl
;
5571 block_group
= btrfs_lookup_block_group(root
->fs_info
, start
);
5575 cache_block_group(block_group
, 0);
5576 caching_ctl
= get_caching_control(block_group
);
5580 BUG_ON(!block_group_cache_done(block_group
));
5581 ret
= btrfs_remove_free_space(block_group
, start
, num_bytes
);
5583 mutex_lock(&caching_ctl
->mutex
);
5585 if (start
>= caching_ctl
->progress
) {
5586 ret
= add_excluded_extent(root
, start
, num_bytes
);
5587 } else if (start
+ num_bytes
<= caching_ctl
->progress
) {
5588 ret
= btrfs_remove_free_space(block_group
,
5591 num_bytes
= caching_ctl
->progress
- start
;
5592 ret
= btrfs_remove_free_space(block_group
,
5597 num_bytes
= (start
+ num_bytes
) -
5598 caching_ctl
->progress
;
5599 start
= caching_ctl
->progress
;
5600 ret
= add_excluded_extent(root
, start
, num_bytes
);
5603 mutex_unlock(&caching_ctl
->mutex
);
5604 put_caching_control(caching_ctl
);
5606 btrfs_put_block_group(block_group
);
5610 int btrfs_exclude_logged_extents(struct btrfs_root
*log
,
5611 struct extent_buffer
*eb
)
5613 struct btrfs_file_extent_item
*item
;
5614 struct btrfs_key key
;
5618 if (!btrfs_fs_incompat(log
->fs_info
, MIXED_GROUPS
))
5621 for (i
= 0; i
< btrfs_header_nritems(eb
); i
++) {
5622 btrfs_item_key_to_cpu(eb
, &key
, i
);
5623 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
5625 item
= btrfs_item_ptr(eb
, i
, struct btrfs_file_extent_item
);
5626 found_type
= btrfs_file_extent_type(eb
, item
);
5627 if (found_type
== BTRFS_FILE_EXTENT_INLINE
)
5629 if (btrfs_file_extent_disk_bytenr(eb
, item
) == 0)
5631 key
.objectid
= btrfs_file_extent_disk_bytenr(eb
, item
);
5632 key
.offset
= btrfs_file_extent_disk_num_bytes(eb
, item
);
5633 __exclude_logged_extent(log
, key
.objectid
, key
.offset
);
5640 * btrfs_update_reserved_bytes - update the block_group and space info counters
5641 * @cache: The cache we are manipulating
5642 * @num_bytes: The number of bytes in question
5643 * @reserve: One of the reservation enums
5644 * @delalloc: The blocks are allocated for the delalloc write
5646 * This is called by the allocator when it reserves space, or by somebody who is
5647 * freeing space that was never actually used on disk. For example if you
5648 * reserve some space for a new leaf in transaction A and before transaction A
5649 * commits you free that leaf, you call this with reserve set to 0 in order to
5650 * clear the reservation.
5652 * Metadata reservations should be called with RESERVE_ALLOC so we do the proper
5653 * ENOSPC accounting. For data we handle the reservation through clearing the
5654 * delalloc bits in the io_tree. We have to do this since we could end up
5655 * allocating less disk space for the amount of data we have reserved in the
5656 * case of compression.
5658 * If this is a reservation and the block group has become read only we cannot
5659 * make the reservation and return -EAGAIN, otherwise this function always
5662 static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache
*cache
,
5663 u64 num_bytes
, int reserve
, int delalloc
)
5665 struct btrfs_space_info
*space_info
= cache
->space_info
;
5668 spin_lock(&space_info
->lock
);
5669 spin_lock(&cache
->lock
);
5670 if (reserve
!= RESERVE_FREE
) {
5674 cache
->reserved
+= num_bytes
;
5675 space_info
->bytes_reserved
+= num_bytes
;
5676 if (reserve
== RESERVE_ALLOC
) {
5677 trace_btrfs_space_reservation(cache
->fs_info
,
5678 "space_info", space_info
->flags
,
5680 space_info
->bytes_may_use
-= num_bytes
;
5684 cache
->delalloc_bytes
+= num_bytes
;
5688 space_info
->bytes_readonly
+= num_bytes
;
5689 cache
->reserved
-= num_bytes
;
5690 space_info
->bytes_reserved
-= num_bytes
;
5693 cache
->delalloc_bytes
-= num_bytes
;
5695 spin_unlock(&cache
->lock
);
5696 spin_unlock(&space_info
->lock
);
5700 void btrfs_prepare_extent_commit(struct btrfs_trans_handle
*trans
,
5701 struct btrfs_root
*root
)
5703 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5704 struct btrfs_caching_control
*next
;
5705 struct btrfs_caching_control
*caching_ctl
;
5706 struct btrfs_block_group_cache
*cache
;
5708 down_write(&fs_info
->commit_root_sem
);
5710 list_for_each_entry_safe(caching_ctl
, next
,
5711 &fs_info
->caching_block_groups
, list
) {
5712 cache
= caching_ctl
->block_group
;
5713 if (block_group_cache_done(cache
)) {
5714 cache
->last_byte_to_unpin
= (u64
)-1;
5715 list_del_init(&caching_ctl
->list
);
5716 put_caching_control(caching_ctl
);
5718 cache
->last_byte_to_unpin
= caching_ctl
->progress
;
5722 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
5723 fs_info
->pinned_extents
= &fs_info
->freed_extents
[1];
5725 fs_info
->pinned_extents
= &fs_info
->freed_extents
[0];
5727 up_write(&fs_info
->commit_root_sem
);
5729 update_global_block_rsv(fs_info
);
5732 static int unpin_extent_range(struct btrfs_root
*root
, u64 start
, u64 end
)
5734 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5735 struct btrfs_block_group_cache
*cache
= NULL
;
5736 struct btrfs_space_info
*space_info
;
5737 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
5741 while (start
<= end
) {
5744 start
>= cache
->key
.objectid
+ cache
->key
.offset
) {
5746 btrfs_put_block_group(cache
);
5747 cache
= btrfs_lookup_block_group(fs_info
, start
);
5748 BUG_ON(!cache
); /* Logic error */
5751 len
= cache
->key
.objectid
+ cache
->key
.offset
- start
;
5752 len
= min(len
, end
+ 1 - start
);
5754 if (start
< cache
->last_byte_to_unpin
) {
5755 len
= min(len
, cache
->last_byte_to_unpin
- start
);
5756 btrfs_add_free_space(cache
, start
, len
);
5760 space_info
= cache
->space_info
;
5762 spin_lock(&space_info
->lock
);
5763 spin_lock(&cache
->lock
);
5764 cache
->pinned
-= len
;
5765 space_info
->bytes_pinned
-= len
;
5766 percpu_counter_add(&space_info
->total_bytes_pinned
, -len
);
5768 space_info
->bytes_readonly
+= len
;
5771 spin_unlock(&cache
->lock
);
5772 if (!readonly
&& global_rsv
->space_info
== space_info
) {
5773 spin_lock(&global_rsv
->lock
);
5774 if (!global_rsv
->full
) {
5775 len
= min(len
, global_rsv
->size
-
5776 global_rsv
->reserved
);
5777 global_rsv
->reserved
+= len
;
5778 space_info
->bytes_may_use
+= len
;
5779 if (global_rsv
->reserved
>= global_rsv
->size
)
5780 global_rsv
->full
= 1;
5782 spin_unlock(&global_rsv
->lock
);
5784 spin_unlock(&space_info
->lock
);
5788 btrfs_put_block_group(cache
);
5792 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
5793 struct btrfs_root
*root
)
5795 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5796 struct extent_io_tree
*unpin
;
5804 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
5805 unpin
= &fs_info
->freed_extents
[1];
5807 unpin
= &fs_info
->freed_extents
[0];
5810 ret
= find_first_extent_bit(unpin
, 0, &start
, &end
,
5811 EXTENT_DIRTY
, NULL
);
5815 if (btrfs_test_opt(root
, DISCARD
))
5816 ret
= btrfs_discard_extent(root
, start
,
5817 end
+ 1 - start
, NULL
);
5819 clear_extent_dirty(unpin
, start
, end
, GFP_NOFS
);
5820 unpin_extent_range(root
, start
, end
);
5827 static void add_pinned_bytes(struct btrfs_fs_info
*fs_info
, u64 num_bytes
,
5828 u64 owner
, u64 root_objectid
)
5830 struct btrfs_space_info
*space_info
;
5833 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
5834 if (root_objectid
== BTRFS_CHUNK_TREE_OBJECTID
)
5835 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
5837 flags
= BTRFS_BLOCK_GROUP_METADATA
;
5839 flags
= BTRFS_BLOCK_GROUP_DATA
;
5842 space_info
= __find_space_info(fs_info
, flags
);
5843 BUG_ON(!space_info
); /* Logic bug */
5844 percpu_counter_add(&space_info
->total_bytes_pinned
, num_bytes
);
5848 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
5849 struct btrfs_root
*root
,
5850 u64 bytenr
, u64 num_bytes
, u64 parent
,
5851 u64 root_objectid
, u64 owner_objectid
,
5852 u64 owner_offset
, int refs_to_drop
,
5853 struct btrfs_delayed_extent_op
*extent_op
,
5856 struct btrfs_key key
;
5857 struct btrfs_path
*path
;
5858 struct btrfs_fs_info
*info
= root
->fs_info
;
5859 struct btrfs_root
*extent_root
= info
->extent_root
;
5860 struct extent_buffer
*leaf
;
5861 struct btrfs_extent_item
*ei
;
5862 struct btrfs_extent_inline_ref
*iref
;
5865 int extent_slot
= 0;
5866 int found_extent
= 0;
5871 enum btrfs_qgroup_operation_type type
= BTRFS_QGROUP_OPER_SUB_EXCL
;
5872 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
5875 if (!info
->quota_enabled
|| !is_fstree(root_objectid
))
5878 path
= btrfs_alloc_path();
5883 path
->leave_spinning
= 1;
5885 is_data
= owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
;
5886 BUG_ON(!is_data
&& refs_to_drop
!= 1);
5889 skinny_metadata
= 0;
5891 ret
= lookup_extent_backref(trans
, extent_root
, path
, &iref
,
5892 bytenr
, num_bytes
, parent
,
5893 root_objectid
, owner_objectid
,
5896 extent_slot
= path
->slots
[0];
5897 while (extent_slot
>= 0) {
5898 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
5900 if (key
.objectid
!= bytenr
)
5902 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
5903 key
.offset
== num_bytes
) {
5907 if (key
.type
== BTRFS_METADATA_ITEM_KEY
&&
5908 key
.offset
== owner_objectid
) {
5912 if (path
->slots
[0] - extent_slot
> 5)
5916 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
5917 item_size
= btrfs_item_size_nr(path
->nodes
[0], extent_slot
);
5918 if (found_extent
&& item_size
< sizeof(*ei
))
5921 if (!found_extent
) {
5923 ret
= remove_extent_backref(trans
, extent_root
, path
,
5925 is_data
, &last_ref
);
5927 btrfs_abort_transaction(trans
, extent_root
, ret
);
5930 btrfs_release_path(path
);
5931 path
->leave_spinning
= 1;
5933 key
.objectid
= bytenr
;
5934 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
5935 key
.offset
= num_bytes
;
5937 if (!is_data
&& skinny_metadata
) {
5938 key
.type
= BTRFS_METADATA_ITEM_KEY
;
5939 key
.offset
= owner_objectid
;
5942 ret
= btrfs_search_slot(trans
, extent_root
,
5944 if (ret
> 0 && skinny_metadata
&& path
->slots
[0]) {
5946 * Couldn't find our skinny metadata item,
5947 * see if we have ye olde extent item.
5950 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
5952 if (key
.objectid
== bytenr
&&
5953 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
5954 key
.offset
== num_bytes
)
5958 if (ret
> 0 && skinny_metadata
) {
5959 skinny_metadata
= false;
5960 key
.objectid
= bytenr
;
5961 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
5962 key
.offset
= num_bytes
;
5963 btrfs_release_path(path
);
5964 ret
= btrfs_search_slot(trans
, extent_root
,
5969 btrfs_err(info
, "umm, got %d back from search, was looking for %llu",
5972 btrfs_print_leaf(extent_root
,
5976 btrfs_abort_transaction(trans
, extent_root
, ret
);
5979 extent_slot
= path
->slots
[0];
5981 } else if (WARN_ON(ret
== -ENOENT
)) {
5982 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
5984 "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu",
5985 bytenr
, parent
, root_objectid
, owner_objectid
,
5987 btrfs_abort_transaction(trans
, extent_root
, ret
);
5990 btrfs_abort_transaction(trans
, extent_root
, ret
);
5994 leaf
= path
->nodes
[0];
5995 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
5996 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
5997 if (item_size
< sizeof(*ei
)) {
5998 BUG_ON(found_extent
|| extent_slot
!= path
->slots
[0]);
5999 ret
= convert_extent_item_v0(trans
, extent_root
, path
,
6002 btrfs_abort_transaction(trans
, extent_root
, ret
);
6006 btrfs_release_path(path
);
6007 path
->leave_spinning
= 1;
6009 key
.objectid
= bytenr
;
6010 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
6011 key
.offset
= num_bytes
;
6013 ret
= btrfs_search_slot(trans
, extent_root
, &key
, path
,
6016 btrfs_err(info
, "umm, got %d back from search, was looking for %llu",
6018 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
6021 btrfs_abort_transaction(trans
, extent_root
, ret
);
6025 extent_slot
= path
->slots
[0];
6026 leaf
= path
->nodes
[0];
6027 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
6030 BUG_ON(item_size
< sizeof(*ei
));
6031 ei
= btrfs_item_ptr(leaf
, extent_slot
,
6032 struct btrfs_extent_item
);
6033 if (owner_objectid
< BTRFS_FIRST_FREE_OBJECTID
&&
6034 key
.type
== BTRFS_EXTENT_ITEM_KEY
) {
6035 struct btrfs_tree_block_info
*bi
;
6036 BUG_ON(item_size
< sizeof(*ei
) + sizeof(*bi
));
6037 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
6038 WARN_ON(owner_objectid
!= btrfs_tree_block_level(leaf
, bi
));
6041 refs
= btrfs_extent_refs(leaf
, ei
);
6042 if (refs
< refs_to_drop
) {
6043 btrfs_err(info
, "trying to drop %d refs but we only have %Lu "
6044 "for bytenr %Lu", refs_to_drop
, refs
, bytenr
);
6046 btrfs_abort_transaction(trans
, extent_root
, ret
);
6049 refs
-= refs_to_drop
;
6052 type
= BTRFS_QGROUP_OPER_SUB_SHARED
;
6054 __run_delayed_extent_op(extent_op
, leaf
, ei
);
6056 * In the case of inline back ref, reference count will
6057 * be updated by remove_extent_backref
6060 BUG_ON(!found_extent
);
6062 btrfs_set_extent_refs(leaf
, ei
, refs
);
6063 btrfs_mark_buffer_dirty(leaf
);
6066 ret
= remove_extent_backref(trans
, extent_root
, path
,
6068 is_data
, &last_ref
);
6070 btrfs_abort_transaction(trans
, extent_root
, ret
);
6074 add_pinned_bytes(root
->fs_info
, -num_bytes
, owner_objectid
,
6078 BUG_ON(is_data
&& refs_to_drop
!=
6079 extent_data_ref_count(root
, path
, iref
));
6081 BUG_ON(path
->slots
[0] != extent_slot
);
6083 BUG_ON(path
->slots
[0] != extent_slot
+ 1);
6084 path
->slots
[0] = extent_slot
;
6090 ret
= btrfs_del_items(trans
, extent_root
, path
, path
->slots
[0],
6093 btrfs_abort_transaction(trans
, extent_root
, ret
);
6096 btrfs_release_path(path
);
6099 ret
= btrfs_del_csums(trans
, root
, bytenr
, num_bytes
);
6101 btrfs_abort_transaction(trans
, extent_root
, ret
);
6106 ret
= update_block_group(root
, bytenr
, num_bytes
, 0);
6108 btrfs_abort_transaction(trans
, extent_root
, ret
);
6112 btrfs_release_path(path
);
6114 /* Deal with the quota accounting */
6115 if (!ret
&& last_ref
&& !no_quota
) {
6118 if (owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
&&
6119 type
== BTRFS_QGROUP_OPER_SUB_SHARED
)
6122 ret
= btrfs_qgroup_record_ref(trans
, info
, root_objectid
,
6123 bytenr
, num_bytes
, type
,
6127 btrfs_free_path(path
);
6132 * when we free an block, it is possible (and likely) that we free the last
6133 * delayed ref for that extent as well. This searches the delayed ref tree for
6134 * a given extent, and if there are no other delayed refs to be processed, it
6135 * removes it from the tree.
6137 static noinline
int check_ref_cleanup(struct btrfs_trans_handle
*trans
,
6138 struct btrfs_root
*root
, u64 bytenr
)
6140 struct btrfs_delayed_ref_head
*head
;
6141 struct btrfs_delayed_ref_root
*delayed_refs
;
6144 delayed_refs
= &trans
->transaction
->delayed_refs
;
6145 spin_lock(&delayed_refs
->lock
);
6146 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
6148 goto out_delayed_unlock
;
6150 spin_lock(&head
->lock
);
6151 if (rb_first(&head
->ref_root
))
6154 if (head
->extent_op
) {
6155 if (!head
->must_insert_reserved
)
6157 btrfs_free_delayed_extent_op(head
->extent_op
);
6158 head
->extent_op
= NULL
;
6162 * waiting for the lock here would deadlock. If someone else has it
6163 * locked they are already in the process of dropping it anyway
6165 if (!mutex_trylock(&head
->mutex
))
6169 * at this point we have a head with no other entries. Go
6170 * ahead and process it.
6172 head
->node
.in_tree
= 0;
6173 rb_erase(&head
->href_node
, &delayed_refs
->href_root
);
6175 atomic_dec(&delayed_refs
->num_entries
);
6178 * we don't take a ref on the node because we're removing it from the
6179 * tree, so we just steal the ref the tree was holding.
6181 delayed_refs
->num_heads
--;
6182 if (head
->processing
== 0)
6183 delayed_refs
->num_heads_ready
--;
6184 head
->processing
= 0;
6185 spin_unlock(&head
->lock
);
6186 spin_unlock(&delayed_refs
->lock
);
6188 BUG_ON(head
->extent_op
);
6189 if (head
->must_insert_reserved
)
6192 mutex_unlock(&head
->mutex
);
6193 btrfs_put_delayed_ref(&head
->node
);
6196 spin_unlock(&head
->lock
);
6199 spin_unlock(&delayed_refs
->lock
);
6203 void btrfs_free_tree_block(struct btrfs_trans_handle
*trans
,
6204 struct btrfs_root
*root
,
6205 struct extent_buffer
*buf
,
6206 u64 parent
, int last_ref
)
6208 struct btrfs_block_group_cache
*cache
= NULL
;
6212 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
6213 ret
= btrfs_add_delayed_tree_ref(root
->fs_info
, trans
,
6214 buf
->start
, buf
->len
,
6215 parent
, root
->root_key
.objectid
,
6216 btrfs_header_level(buf
),
6217 BTRFS_DROP_DELAYED_REF
, NULL
, 0);
6218 BUG_ON(ret
); /* -ENOMEM */
6224 cache
= btrfs_lookup_block_group(root
->fs_info
, buf
->start
);
6226 if (btrfs_header_generation(buf
) == trans
->transid
) {
6227 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
6228 ret
= check_ref_cleanup(trans
, root
, buf
->start
);
6233 if (btrfs_header_flag(buf
, BTRFS_HEADER_FLAG_WRITTEN
)) {
6234 pin_down_extent(root
, cache
, buf
->start
, buf
->len
, 1);
6238 WARN_ON(test_bit(EXTENT_BUFFER_DIRTY
, &buf
->bflags
));
6240 btrfs_add_free_space(cache
, buf
->start
, buf
->len
);
6241 btrfs_update_reserved_bytes(cache
, buf
->len
, RESERVE_FREE
, 0);
6242 trace_btrfs_reserved_extent_free(root
, buf
->start
, buf
->len
);
6247 add_pinned_bytes(root
->fs_info
, buf
->len
,
6248 btrfs_header_level(buf
),
6249 root
->root_key
.objectid
);
6252 * Deleting the buffer, clear the corrupt flag since it doesn't matter
6255 clear_bit(EXTENT_BUFFER_CORRUPT
, &buf
->bflags
);
6256 btrfs_put_block_group(cache
);
6259 /* Can return -ENOMEM */
6260 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
6261 u64 bytenr
, u64 num_bytes
, u64 parent
, u64 root_objectid
,
6262 u64 owner
, u64 offset
, int no_quota
)
6265 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
6267 if (btrfs_test_is_dummy_root(root
))
6270 add_pinned_bytes(root
->fs_info
, num_bytes
, owner
, root_objectid
);
6273 * tree log blocks never actually go into the extent allocation
6274 * tree, just update pinning info and exit early.
6276 if (root_objectid
== BTRFS_TREE_LOG_OBJECTID
) {
6277 WARN_ON(owner
>= BTRFS_FIRST_FREE_OBJECTID
);
6278 /* unlocks the pinned mutex */
6279 btrfs_pin_extent(root
, bytenr
, num_bytes
, 1);
6281 } else if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
6282 ret
= btrfs_add_delayed_tree_ref(fs_info
, trans
, bytenr
,
6284 parent
, root_objectid
, (int)owner
,
6285 BTRFS_DROP_DELAYED_REF
, NULL
, no_quota
);
6287 ret
= btrfs_add_delayed_data_ref(fs_info
, trans
, bytenr
,
6289 parent
, root_objectid
, owner
,
6290 offset
, BTRFS_DROP_DELAYED_REF
,
6297 * when we wait for progress in the block group caching, its because
6298 * our allocation attempt failed at least once. So, we must sleep
6299 * and let some progress happen before we try again.
6301 * This function will sleep at least once waiting for new free space to
6302 * show up, and then it will check the block group free space numbers
6303 * for our min num_bytes. Another option is to have it go ahead
6304 * and look in the rbtree for a free extent of a given size, but this
6307 * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using
6308 * any of the information in this block group.
6310 static noinline
void
6311 wait_block_group_cache_progress(struct btrfs_block_group_cache
*cache
,
6314 struct btrfs_caching_control
*caching_ctl
;
6316 caching_ctl
= get_caching_control(cache
);
6320 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
) ||
6321 (cache
->free_space_ctl
->free_space
>= num_bytes
));
6323 put_caching_control(caching_ctl
);
6327 wait_block_group_cache_done(struct btrfs_block_group_cache
*cache
)
6329 struct btrfs_caching_control
*caching_ctl
;
6332 caching_ctl
= get_caching_control(cache
);
6334 return (cache
->cached
== BTRFS_CACHE_ERROR
) ? -EIO
: 0;
6336 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
));
6337 if (cache
->cached
== BTRFS_CACHE_ERROR
)
6339 put_caching_control(caching_ctl
);
6343 int __get_raid_index(u64 flags
)
6345 if (flags
& BTRFS_BLOCK_GROUP_RAID10
)
6346 return BTRFS_RAID_RAID10
;
6347 else if (flags
& BTRFS_BLOCK_GROUP_RAID1
)
6348 return BTRFS_RAID_RAID1
;
6349 else if (flags
& BTRFS_BLOCK_GROUP_DUP
)
6350 return BTRFS_RAID_DUP
;
6351 else if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
6352 return BTRFS_RAID_RAID0
;
6353 else if (flags
& BTRFS_BLOCK_GROUP_RAID5
)
6354 return BTRFS_RAID_RAID5
;
6355 else if (flags
& BTRFS_BLOCK_GROUP_RAID6
)
6356 return BTRFS_RAID_RAID6
;
6358 return BTRFS_RAID_SINGLE
; /* BTRFS_BLOCK_GROUP_SINGLE */
6361 int get_block_group_index(struct btrfs_block_group_cache
*cache
)
6363 return __get_raid_index(cache
->flags
);
6366 static const char *btrfs_raid_type_names
[BTRFS_NR_RAID_TYPES
] = {
6367 [BTRFS_RAID_RAID10
] = "raid10",
6368 [BTRFS_RAID_RAID1
] = "raid1",
6369 [BTRFS_RAID_DUP
] = "dup",
6370 [BTRFS_RAID_RAID0
] = "raid0",
6371 [BTRFS_RAID_SINGLE
] = "single",
6372 [BTRFS_RAID_RAID5
] = "raid5",
6373 [BTRFS_RAID_RAID6
] = "raid6",
6376 static const char *get_raid_name(enum btrfs_raid_types type
)
6378 if (type
>= BTRFS_NR_RAID_TYPES
)
6381 return btrfs_raid_type_names
[type
];
6384 enum btrfs_loop_type
{
6385 LOOP_CACHING_NOWAIT
= 0,
6386 LOOP_CACHING_WAIT
= 1,
6387 LOOP_ALLOC_CHUNK
= 2,
6388 LOOP_NO_EMPTY_SIZE
= 3,
6392 btrfs_lock_block_group(struct btrfs_block_group_cache
*cache
,
6396 down_read(&cache
->data_rwsem
);
6400 btrfs_grab_block_group(struct btrfs_block_group_cache
*cache
,
6403 btrfs_get_block_group(cache
);
6405 down_read(&cache
->data_rwsem
);
6408 static struct btrfs_block_group_cache
*
6409 btrfs_lock_cluster(struct btrfs_block_group_cache
*block_group
,
6410 struct btrfs_free_cluster
*cluster
,
6413 struct btrfs_block_group_cache
*used_bg
;
6414 bool locked
= false;
6416 spin_lock(&cluster
->refill_lock
);
6418 if (used_bg
== cluster
->block_group
)
6421 up_read(&used_bg
->data_rwsem
);
6422 btrfs_put_block_group(used_bg
);
6425 used_bg
= cluster
->block_group
;
6429 if (used_bg
== block_group
)
6432 btrfs_get_block_group(used_bg
);
6437 if (down_read_trylock(&used_bg
->data_rwsem
))
6440 spin_unlock(&cluster
->refill_lock
);
6441 down_read(&used_bg
->data_rwsem
);
6447 btrfs_release_block_group(struct btrfs_block_group_cache
*cache
,
6451 up_read(&cache
->data_rwsem
);
6452 btrfs_put_block_group(cache
);
6456 * walks the btree of allocated extents and find a hole of a given size.
6457 * The key ins is changed to record the hole:
6458 * ins->objectid == start position
6459 * ins->flags = BTRFS_EXTENT_ITEM_KEY
6460 * ins->offset == the size of the hole.
6461 * Any available blocks before search_start are skipped.
6463 * If there is no suitable free space, we will record the max size of
6464 * the free space extent currently.
6466 static noinline
int find_free_extent(struct btrfs_root
*orig_root
,
6467 u64 num_bytes
, u64 empty_size
,
6468 u64 hint_byte
, struct btrfs_key
*ins
,
6469 u64 flags
, int delalloc
)
6472 struct btrfs_root
*root
= orig_root
->fs_info
->extent_root
;
6473 struct btrfs_free_cluster
*last_ptr
= NULL
;
6474 struct btrfs_block_group_cache
*block_group
= NULL
;
6475 u64 search_start
= 0;
6476 u64 max_extent_size
= 0;
6477 int empty_cluster
= 2 * 1024 * 1024;
6478 struct btrfs_space_info
*space_info
;
6480 int index
= __get_raid_index(flags
);
6481 int alloc_type
= (flags
& BTRFS_BLOCK_GROUP_DATA
) ?
6482 RESERVE_ALLOC_NO_ACCOUNT
: RESERVE_ALLOC
;
6483 bool failed_cluster_refill
= false;
6484 bool failed_alloc
= false;
6485 bool use_cluster
= true;
6486 bool have_caching_bg
= false;
6488 WARN_ON(num_bytes
< root
->sectorsize
);
6489 ins
->type
= BTRFS_EXTENT_ITEM_KEY
;
6493 trace_find_free_extent(orig_root
, num_bytes
, empty_size
, flags
);
6495 space_info
= __find_space_info(root
->fs_info
, flags
);
6497 btrfs_err(root
->fs_info
, "No space info for %llu", flags
);
6502 * If the space info is for both data and metadata it means we have a
6503 * small filesystem and we can't use the clustering stuff.
6505 if (btrfs_mixed_space_info(space_info
))
6506 use_cluster
= false;
6508 if (flags
& BTRFS_BLOCK_GROUP_METADATA
&& use_cluster
) {
6509 last_ptr
= &root
->fs_info
->meta_alloc_cluster
;
6510 if (!btrfs_test_opt(root
, SSD
))
6511 empty_cluster
= 64 * 1024;
6514 if ((flags
& BTRFS_BLOCK_GROUP_DATA
) && use_cluster
&&
6515 btrfs_test_opt(root
, SSD
)) {
6516 last_ptr
= &root
->fs_info
->data_alloc_cluster
;
6520 spin_lock(&last_ptr
->lock
);
6521 if (last_ptr
->block_group
)
6522 hint_byte
= last_ptr
->window_start
;
6523 spin_unlock(&last_ptr
->lock
);
6526 search_start
= max(search_start
, first_logical_byte(root
, 0));
6527 search_start
= max(search_start
, hint_byte
);
6532 if (search_start
== hint_byte
) {
6533 block_group
= btrfs_lookup_block_group(root
->fs_info
,
6536 * we don't want to use the block group if it doesn't match our
6537 * allocation bits, or if its not cached.
6539 * However if we are re-searching with an ideal block group
6540 * picked out then we don't care that the block group is cached.
6542 if (block_group
&& block_group_bits(block_group
, flags
) &&
6543 block_group
->cached
!= BTRFS_CACHE_NO
) {
6544 down_read(&space_info
->groups_sem
);
6545 if (list_empty(&block_group
->list
) ||
6548 * someone is removing this block group,
6549 * we can't jump into the have_block_group
6550 * target because our list pointers are not
6553 btrfs_put_block_group(block_group
);
6554 up_read(&space_info
->groups_sem
);
6556 index
= get_block_group_index(block_group
);
6557 btrfs_lock_block_group(block_group
, delalloc
);
6558 goto have_block_group
;
6560 } else if (block_group
) {
6561 btrfs_put_block_group(block_group
);
6565 have_caching_bg
= false;
6566 down_read(&space_info
->groups_sem
);
6567 list_for_each_entry(block_group
, &space_info
->block_groups
[index
],
6572 btrfs_grab_block_group(block_group
, delalloc
);
6573 search_start
= block_group
->key
.objectid
;
6576 * this can happen if we end up cycling through all the
6577 * raid types, but we want to make sure we only allocate
6578 * for the proper type.
6580 if (!block_group_bits(block_group
, flags
)) {
6581 u64 extra
= BTRFS_BLOCK_GROUP_DUP
|
6582 BTRFS_BLOCK_GROUP_RAID1
|
6583 BTRFS_BLOCK_GROUP_RAID5
|
6584 BTRFS_BLOCK_GROUP_RAID6
|
6585 BTRFS_BLOCK_GROUP_RAID10
;
6588 * if they asked for extra copies and this block group
6589 * doesn't provide them, bail. This does allow us to
6590 * fill raid0 from raid1.
6592 if ((flags
& extra
) && !(block_group
->flags
& extra
))
6597 cached
= block_group_cache_done(block_group
);
6598 if (unlikely(!cached
)) {
6599 ret
= cache_block_group(block_group
, 0);
6604 if (unlikely(block_group
->cached
== BTRFS_CACHE_ERROR
))
6606 if (unlikely(block_group
->ro
))
6610 * Ok we want to try and use the cluster allocator, so
6614 struct btrfs_block_group_cache
*used_block_group
;
6615 unsigned long aligned_cluster
;
6617 * the refill lock keeps out other
6618 * people trying to start a new cluster
6620 used_block_group
= btrfs_lock_cluster(block_group
,
6623 if (!used_block_group
)
6624 goto refill_cluster
;
6626 if (used_block_group
!= block_group
&&
6627 (used_block_group
->ro
||
6628 !block_group_bits(used_block_group
, flags
)))
6629 goto release_cluster
;
6631 offset
= btrfs_alloc_from_cluster(used_block_group
,
6634 used_block_group
->key
.objectid
,
6637 /* we have a block, we're done */
6638 spin_unlock(&last_ptr
->refill_lock
);
6639 trace_btrfs_reserve_extent_cluster(root
,
6641 search_start
, num_bytes
);
6642 if (used_block_group
!= block_group
) {
6643 btrfs_release_block_group(block_group
,
6645 block_group
= used_block_group
;
6650 WARN_ON(last_ptr
->block_group
!= used_block_group
);
6652 /* If we are on LOOP_NO_EMPTY_SIZE, we can't
6653 * set up a new clusters, so lets just skip it
6654 * and let the allocator find whatever block
6655 * it can find. If we reach this point, we
6656 * will have tried the cluster allocator
6657 * plenty of times and not have found
6658 * anything, so we are likely way too
6659 * fragmented for the clustering stuff to find
6662 * However, if the cluster is taken from the
6663 * current block group, release the cluster
6664 * first, so that we stand a better chance of
6665 * succeeding in the unclustered
6667 if (loop
>= LOOP_NO_EMPTY_SIZE
&&
6668 used_block_group
!= block_group
) {
6669 spin_unlock(&last_ptr
->refill_lock
);
6670 btrfs_release_block_group(used_block_group
,
6672 goto unclustered_alloc
;
6676 * this cluster didn't work out, free it and
6679 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
6681 if (used_block_group
!= block_group
)
6682 btrfs_release_block_group(used_block_group
,
6685 if (loop
>= LOOP_NO_EMPTY_SIZE
) {
6686 spin_unlock(&last_ptr
->refill_lock
);
6687 goto unclustered_alloc
;
6690 aligned_cluster
= max_t(unsigned long,
6691 empty_cluster
+ empty_size
,
6692 block_group
->full_stripe_len
);
6694 /* allocate a cluster in this block group */
6695 ret
= btrfs_find_space_cluster(root
, block_group
,
6696 last_ptr
, search_start
,
6701 * now pull our allocation out of this
6704 offset
= btrfs_alloc_from_cluster(block_group
,
6710 /* we found one, proceed */
6711 spin_unlock(&last_ptr
->refill_lock
);
6712 trace_btrfs_reserve_extent_cluster(root
,
6713 block_group
, search_start
,
6717 } else if (!cached
&& loop
> LOOP_CACHING_NOWAIT
6718 && !failed_cluster_refill
) {
6719 spin_unlock(&last_ptr
->refill_lock
);
6721 failed_cluster_refill
= true;
6722 wait_block_group_cache_progress(block_group
,
6723 num_bytes
+ empty_cluster
+ empty_size
);
6724 goto have_block_group
;
6728 * at this point we either didn't find a cluster
6729 * or we weren't able to allocate a block from our
6730 * cluster. Free the cluster we've been trying
6731 * to use, and go to the next block group
6733 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
6734 spin_unlock(&last_ptr
->refill_lock
);
6739 spin_lock(&block_group
->free_space_ctl
->tree_lock
);
6741 block_group
->free_space_ctl
->free_space
<
6742 num_bytes
+ empty_cluster
+ empty_size
) {
6743 if (block_group
->free_space_ctl
->free_space
>
6746 block_group
->free_space_ctl
->free_space
;
6747 spin_unlock(&block_group
->free_space_ctl
->tree_lock
);
6750 spin_unlock(&block_group
->free_space_ctl
->tree_lock
);
6752 offset
= btrfs_find_space_for_alloc(block_group
, search_start
,
6753 num_bytes
, empty_size
,
6756 * If we didn't find a chunk, and we haven't failed on this
6757 * block group before, and this block group is in the middle of
6758 * caching and we are ok with waiting, then go ahead and wait
6759 * for progress to be made, and set failed_alloc to true.
6761 * If failed_alloc is true then we've already waited on this
6762 * block group once and should move on to the next block group.
6764 if (!offset
&& !failed_alloc
&& !cached
&&
6765 loop
> LOOP_CACHING_NOWAIT
) {
6766 wait_block_group_cache_progress(block_group
,
6767 num_bytes
+ empty_size
);
6768 failed_alloc
= true;
6769 goto have_block_group
;
6770 } else if (!offset
) {
6772 have_caching_bg
= true;
6776 search_start
= ALIGN(offset
, root
->stripesize
);
6778 /* move on to the next group */
6779 if (search_start
+ num_bytes
>
6780 block_group
->key
.objectid
+ block_group
->key
.offset
) {
6781 btrfs_add_free_space(block_group
, offset
, num_bytes
);
6785 if (offset
< search_start
)
6786 btrfs_add_free_space(block_group
, offset
,
6787 search_start
- offset
);
6788 BUG_ON(offset
> search_start
);
6790 ret
= btrfs_update_reserved_bytes(block_group
, num_bytes
,
6791 alloc_type
, delalloc
);
6792 if (ret
== -EAGAIN
) {
6793 btrfs_add_free_space(block_group
, offset
, num_bytes
);
6797 /* we are all good, lets return */
6798 ins
->objectid
= search_start
;
6799 ins
->offset
= num_bytes
;
6801 trace_btrfs_reserve_extent(orig_root
, block_group
,
6802 search_start
, num_bytes
);
6803 btrfs_release_block_group(block_group
, delalloc
);
6806 failed_cluster_refill
= false;
6807 failed_alloc
= false;
6808 BUG_ON(index
!= get_block_group_index(block_group
));
6809 btrfs_release_block_group(block_group
, delalloc
);
6811 up_read(&space_info
->groups_sem
);
6813 if (!ins
->objectid
&& loop
>= LOOP_CACHING_WAIT
&& have_caching_bg
)
6816 if (!ins
->objectid
&& ++index
< BTRFS_NR_RAID_TYPES
)
6820 * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking
6821 * caching kthreads as we move along
6822 * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching
6823 * LOOP_ALLOC_CHUNK, force a chunk allocation and try again
6824 * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
6827 if (!ins
->objectid
&& loop
< LOOP_NO_EMPTY_SIZE
) {
6830 if (loop
== LOOP_ALLOC_CHUNK
) {
6831 struct btrfs_trans_handle
*trans
;
6834 trans
= current
->journal_info
;
6838 trans
= btrfs_join_transaction(root
);
6840 if (IS_ERR(trans
)) {
6841 ret
= PTR_ERR(trans
);
6845 ret
= do_chunk_alloc(trans
, root
, flags
,
6848 * Do not bail out on ENOSPC since we
6849 * can do more things.
6851 if (ret
< 0 && ret
!= -ENOSPC
)
6852 btrfs_abort_transaction(trans
,
6857 btrfs_end_transaction(trans
, root
);
6862 if (loop
== LOOP_NO_EMPTY_SIZE
) {
6868 } else if (!ins
->objectid
) {
6870 } else if (ins
->objectid
) {
6875 ins
->offset
= max_extent_size
;
6879 static void dump_space_info(struct btrfs_space_info
*info
, u64 bytes
,
6880 int dump_block_groups
)
6882 struct btrfs_block_group_cache
*cache
;
6885 spin_lock(&info
->lock
);
6886 printk(KERN_INFO
"BTRFS: space_info %llu has %llu free, is %sfull\n",
6888 info
->total_bytes
- info
->bytes_used
- info
->bytes_pinned
-
6889 info
->bytes_reserved
- info
->bytes_readonly
,
6890 (info
->full
) ? "" : "not ");
6891 printk(KERN_INFO
"BTRFS: space_info total=%llu, used=%llu, pinned=%llu, "
6892 "reserved=%llu, may_use=%llu, readonly=%llu\n",
6893 info
->total_bytes
, info
->bytes_used
, info
->bytes_pinned
,
6894 info
->bytes_reserved
, info
->bytes_may_use
,
6895 info
->bytes_readonly
);
6896 spin_unlock(&info
->lock
);
6898 if (!dump_block_groups
)
6901 down_read(&info
->groups_sem
);
6903 list_for_each_entry(cache
, &info
->block_groups
[index
], list
) {
6904 spin_lock(&cache
->lock
);
6905 printk(KERN_INFO
"BTRFS: "
6906 "block group %llu has %llu bytes, "
6907 "%llu used %llu pinned %llu reserved %s\n",
6908 cache
->key
.objectid
, cache
->key
.offset
,
6909 btrfs_block_group_used(&cache
->item
), cache
->pinned
,
6910 cache
->reserved
, cache
->ro
? "[readonly]" : "");
6911 btrfs_dump_free_space(cache
, bytes
);
6912 spin_unlock(&cache
->lock
);
6914 if (++index
< BTRFS_NR_RAID_TYPES
)
6916 up_read(&info
->groups_sem
);
6919 int btrfs_reserve_extent(struct btrfs_root
*root
,
6920 u64 num_bytes
, u64 min_alloc_size
,
6921 u64 empty_size
, u64 hint_byte
,
6922 struct btrfs_key
*ins
, int is_data
, int delalloc
)
6924 bool final_tried
= false;
6928 flags
= btrfs_get_alloc_profile(root
, is_data
);
6930 WARN_ON(num_bytes
< root
->sectorsize
);
6931 ret
= find_free_extent(root
, num_bytes
, empty_size
, hint_byte
, ins
,
6934 if (ret
== -ENOSPC
) {
6935 if (!final_tried
&& ins
->offset
) {
6936 num_bytes
= min(num_bytes
>> 1, ins
->offset
);
6937 num_bytes
= round_down(num_bytes
, root
->sectorsize
);
6938 num_bytes
= max(num_bytes
, min_alloc_size
);
6939 if (num_bytes
== min_alloc_size
)
6942 } else if (btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
6943 struct btrfs_space_info
*sinfo
;
6945 sinfo
= __find_space_info(root
->fs_info
, flags
);
6946 btrfs_err(root
->fs_info
, "allocation failed flags %llu, wanted %llu",
6949 dump_space_info(sinfo
, num_bytes
, 1);
6956 static int __btrfs_free_reserved_extent(struct btrfs_root
*root
,
6958 int pin
, int delalloc
)
6960 struct btrfs_block_group_cache
*cache
;
6963 cache
= btrfs_lookup_block_group(root
->fs_info
, start
);
6965 btrfs_err(root
->fs_info
, "Unable to find block group for %llu",
6970 if (btrfs_test_opt(root
, DISCARD
))
6971 ret
= btrfs_discard_extent(root
, start
, len
, NULL
);
6974 pin_down_extent(root
, cache
, start
, len
, 1);
6976 btrfs_add_free_space(cache
, start
, len
);
6977 btrfs_update_reserved_bytes(cache
, len
, RESERVE_FREE
, delalloc
);
6979 btrfs_put_block_group(cache
);
6981 trace_btrfs_reserved_extent_free(root
, start
, len
);
6986 int btrfs_free_reserved_extent(struct btrfs_root
*root
,
6987 u64 start
, u64 len
, int delalloc
)
6989 return __btrfs_free_reserved_extent(root
, start
, len
, 0, delalloc
);
6992 int btrfs_free_and_pin_reserved_extent(struct btrfs_root
*root
,
6995 return __btrfs_free_reserved_extent(root
, start
, len
, 1, 0);
6998 static int alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
6999 struct btrfs_root
*root
,
7000 u64 parent
, u64 root_objectid
,
7001 u64 flags
, u64 owner
, u64 offset
,
7002 struct btrfs_key
*ins
, int ref_mod
)
7005 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
7006 struct btrfs_extent_item
*extent_item
;
7007 struct btrfs_extent_inline_ref
*iref
;
7008 struct btrfs_path
*path
;
7009 struct extent_buffer
*leaf
;
7014 type
= BTRFS_SHARED_DATA_REF_KEY
;
7016 type
= BTRFS_EXTENT_DATA_REF_KEY
;
7018 size
= sizeof(*extent_item
) + btrfs_extent_inline_ref_size(type
);
7020 path
= btrfs_alloc_path();
7024 path
->leave_spinning
= 1;
7025 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
7028 btrfs_free_path(path
);
7032 leaf
= path
->nodes
[0];
7033 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
7034 struct btrfs_extent_item
);
7035 btrfs_set_extent_refs(leaf
, extent_item
, ref_mod
);
7036 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
7037 btrfs_set_extent_flags(leaf
, extent_item
,
7038 flags
| BTRFS_EXTENT_FLAG_DATA
);
7040 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
7041 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
7043 struct btrfs_shared_data_ref
*ref
;
7044 ref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
7045 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
7046 btrfs_set_shared_data_ref_count(leaf
, ref
, ref_mod
);
7048 struct btrfs_extent_data_ref
*ref
;
7049 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
7050 btrfs_set_extent_data_ref_root(leaf
, ref
, root_objectid
);
7051 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
7052 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
7053 btrfs_set_extent_data_ref_count(leaf
, ref
, ref_mod
);
7056 btrfs_mark_buffer_dirty(path
->nodes
[0]);
7057 btrfs_free_path(path
);
7059 /* Always set parent to 0 here since its exclusive anyway. */
7060 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
7061 ins
->objectid
, ins
->offset
,
7062 BTRFS_QGROUP_OPER_ADD_EXCL
, 0);
7066 ret
= update_block_group(root
, ins
->objectid
, ins
->offset
, 1);
7067 if (ret
) { /* -ENOENT, logic error */
7068 btrfs_err(fs_info
, "update block group failed for %llu %llu",
7069 ins
->objectid
, ins
->offset
);
7072 trace_btrfs_reserved_extent_alloc(root
, ins
->objectid
, ins
->offset
);
7076 static int alloc_reserved_tree_block(struct btrfs_trans_handle
*trans
,
7077 struct btrfs_root
*root
,
7078 u64 parent
, u64 root_objectid
,
7079 u64 flags
, struct btrfs_disk_key
*key
,
7080 int level
, struct btrfs_key
*ins
,
7084 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
7085 struct btrfs_extent_item
*extent_item
;
7086 struct btrfs_tree_block_info
*block_info
;
7087 struct btrfs_extent_inline_ref
*iref
;
7088 struct btrfs_path
*path
;
7089 struct extent_buffer
*leaf
;
7090 u32 size
= sizeof(*extent_item
) + sizeof(*iref
);
7091 u64 num_bytes
= ins
->offset
;
7092 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
7095 if (!skinny_metadata
)
7096 size
+= sizeof(*block_info
);
7098 path
= btrfs_alloc_path();
7100 btrfs_free_and_pin_reserved_extent(root
, ins
->objectid
,
7105 path
->leave_spinning
= 1;
7106 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
7109 btrfs_free_and_pin_reserved_extent(root
, ins
->objectid
,
7111 btrfs_free_path(path
);
7115 leaf
= path
->nodes
[0];
7116 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
7117 struct btrfs_extent_item
);
7118 btrfs_set_extent_refs(leaf
, extent_item
, 1);
7119 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
7120 btrfs_set_extent_flags(leaf
, extent_item
,
7121 flags
| BTRFS_EXTENT_FLAG_TREE_BLOCK
);
7123 if (skinny_metadata
) {
7124 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
7125 num_bytes
= root
->nodesize
;
7127 block_info
= (struct btrfs_tree_block_info
*)(extent_item
+ 1);
7128 btrfs_set_tree_block_key(leaf
, block_info
, key
);
7129 btrfs_set_tree_block_level(leaf
, block_info
, level
);
7130 iref
= (struct btrfs_extent_inline_ref
*)(block_info
+ 1);
7134 BUG_ON(!(flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
));
7135 btrfs_set_extent_inline_ref_type(leaf
, iref
,
7136 BTRFS_SHARED_BLOCK_REF_KEY
);
7137 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
7139 btrfs_set_extent_inline_ref_type(leaf
, iref
,
7140 BTRFS_TREE_BLOCK_REF_KEY
);
7141 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
7144 btrfs_mark_buffer_dirty(leaf
);
7145 btrfs_free_path(path
);
7148 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
7149 ins
->objectid
, num_bytes
,
7150 BTRFS_QGROUP_OPER_ADD_EXCL
, 0);
7155 ret
= update_block_group(root
, ins
->objectid
, root
->nodesize
, 1);
7156 if (ret
) { /* -ENOENT, logic error */
7157 btrfs_err(fs_info
, "update block group failed for %llu %llu",
7158 ins
->objectid
, ins
->offset
);
7162 trace_btrfs_reserved_extent_alloc(root
, ins
->objectid
, root
->nodesize
);
7166 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
7167 struct btrfs_root
*root
,
7168 u64 root_objectid
, u64 owner
,
7169 u64 offset
, struct btrfs_key
*ins
)
7173 BUG_ON(root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
7175 ret
= btrfs_add_delayed_data_ref(root
->fs_info
, trans
, ins
->objectid
,
7177 root_objectid
, owner
, offset
,
7178 BTRFS_ADD_DELAYED_EXTENT
, NULL
, 0);
7183 * this is used by the tree logging recovery code. It records that
7184 * an extent has been allocated and makes sure to clear the free
7185 * space cache bits as well
7187 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle
*trans
,
7188 struct btrfs_root
*root
,
7189 u64 root_objectid
, u64 owner
, u64 offset
,
7190 struct btrfs_key
*ins
)
7193 struct btrfs_block_group_cache
*block_group
;
7196 * Mixed block groups will exclude before processing the log so we only
7197 * need to do the exlude dance if this fs isn't mixed.
7199 if (!btrfs_fs_incompat(root
->fs_info
, MIXED_GROUPS
)) {
7200 ret
= __exclude_logged_extent(root
, ins
->objectid
, ins
->offset
);
7205 block_group
= btrfs_lookup_block_group(root
->fs_info
, ins
->objectid
);
7209 ret
= btrfs_update_reserved_bytes(block_group
, ins
->offset
,
7210 RESERVE_ALLOC_NO_ACCOUNT
, 0);
7211 BUG_ON(ret
); /* logic error */
7212 ret
= alloc_reserved_file_extent(trans
, root
, 0, root_objectid
,
7213 0, owner
, offset
, ins
, 1);
7214 btrfs_put_block_group(block_group
);
7218 static struct extent_buffer
*
7219 btrfs_init_new_buffer(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
7220 u64 bytenr
, u32 blocksize
, int level
)
7222 struct extent_buffer
*buf
;
7224 buf
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
7226 return ERR_PTR(-ENOMEM
);
7227 btrfs_set_header_generation(buf
, trans
->transid
);
7228 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, buf
, level
);
7229 btrfs_tree_lock(buf
);
7230 clean_tree_block(trans
, root
, buf
);
7231 clear_bit(EXTENT_BUFFER_STALE
, &buf
->bflags
);
7233 btrfs_set_lock_blocking(buf
);
7234 btrfs_set_buffer_uptodate(buf
);
7236 if (root
->root_key
.objectid
== BTRFS_TREE_LOG_OBJECTID
) {
7237 buf
->log_index
= root
->log_transid
% 2;
7239 * we allow two log transactions at a time, use different
7240 * EXENT bit to differentiate dirty pages.
7242 if (buf
->log_index
== 0)
7243 set_extent_dirty(&root
->dirty_log_pages
, buf
->start
,
7244 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7246 set_extent_new(&root
->dirty_log_pages
, buf
->start
,
7247 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7249 buf
->log_index
= -1;
7250 set_extent_dirty(&trans
->transaction
->dirty_pages
, buf
->start
,
7251 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7253 trans
->blocks_used
++;
7254 /* this returns a buffer locked for blocking */
7258 static struct btrfs_block_rsv
*
7259 use_block_rsv(struct btrfs_trans_handle
*trans
,
7260 struct btrfs_root
*root
, u32 blocksize
)
7262 struct btrfs_block_rsv
*block_rsv
;
7263 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
7265 bool global_updated
= false;
7267 block_rsv
= get_block_rsv(trans
, root
);
7269 if (unlikely(block_rsv
->size
== 0))
7272 ret
= block_rsv_use_bytes(block_rsv
, blocksize
);
7276 if (block_rsv
->failfast
)
7277 return ERR_PTR(ret
);
7279 if (block_rsv
->type
== BTRFS_BLOCK_RSV_GLOBAL
&& !global_updated
) {
7280 global_updated
= true;
7281 update_global_block_rsv(root
->fs_info
);
7285 if (btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
7286 static DEFINE_RATELIMIT_STATE(_rs
,
7287 DEFAULT_RATELIMIT_INTERVAL
* 10,
7288 /*DEFAULT_RATELIMIT_BURST*/ 1);
7289 if (__ratelimit(&_rs
))
7291 "BTRFS: block rsv returned %d\n", ret
);
7294 ret
= reserve_metadata_bytes(root
, block_rsv
, blocksize
,
7295 BTRFS_RESERVE_NO_FLUSH
);
7299 * If we couldn't reserve metadata bytes try and use some from
7300 * the global reserve if its space type is the same as the global
7303 if (block_rsv
->type
!= BTRFS_BLOCK_RSV_GLOBAL
&&
7304 block_rsv
->space_info
== global_rsv
->space_info
) {
7305 ret
= block_rsv_use_bytes(global_rsv
, blocksize
);
7309 return ERR_PTR(ret
);
7312 static void unuse_block_rsv(struct btrfs_fs_info
*fs_info
,
7313 struct btrfs_block_rsv
*block_rsv
, u32 blocksize
)
7315 block_rsv_add_bytes(block_rsv
, blocksize
, 0);
7316 block_rsv_release_bytes(fs_info
, block_rsv
, NULL
, 0);
7320 * finds a free extent and does all the dirty work required for allocation
7321 * returns the key for the extent through ins, and a tree buffer for
7322 * the first block of the extent through buf.
7324 * returns the tree buffer or NULL.
7326 struct extent_buffer
*btrfs_alloc_tree_block(struct btrfs_trans_handle
*trans
,
7327 struct btrfs_root
*root
,
7328 u64 parent
, u64 root_objectid
,
7329 struct btrfs_disk_key
*key
, int level
,
7330 u64 hint
, u64 empty_size
)
7332 struct btrfs_key ins
;
7333 struct btrfs_block_rsv
*block_rsv
;
7334 struct extent_buffer
*buf
;
7337 u32 blocksize
= root
->nodesize
;
7338 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
7341 if (btrfs_test_is_dummy_root(root
)) {
7342 buf
= btrfs_init_new_buffer(trans
, root
, root
->alloc_bytenr
,
7345 root
->alloc_bytenr
+= blocksize
;
7349 block_rsv
= use_block_rsv(trans
, root
, blocksize
);
7350 if (IS_ERR(block_rsv
))
7351 return ERR_CAST(block_rsv
);
7353 ret
= btrfs_reserve_extent(root
, blocksize
, blocksize
,
7354 empty_size
, hint
, &ins
, 0, 0);
7356 unuse_block_rsv(root
->fs_info
, block_rsv
, blocksize
);
7357 return ERR_PTR(ret
);
7360 buf
= btrfs_init_new_buffer(trans
, root
, ins
.objectid
,
7362 BUG_ON(IS_ERR(buf
)); /* -ENOMEM */
7364 if (root_objectid
== BTRFS_TREE_RELOC_OBJECTID
) {
7366 parent
= ins
.objectid
;
7367 flags
|= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
7371 if (root_objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
7372 struct btrfs_delayed_extent_op
*extent_op
;
7373 extent_op
= btrfs_alloc_delayed_extent_op();
7374 BUG_ON(!extent_op
); /* -ENOMEM */
7376 memcpy(&extent_op
->key
, key
, sizeof(extent_op
->key
));
7378 memset(&extent_op
->key
, 0, sizeof(extent_op
->key
));
7379 extent_op
->flags_to_set
= flags
;
7380 if (skinny_metadata
)
7381 extent_op
->update_key
= 0;
7383 extent_op
->update_key
= 1;
7384 extent_op
->update_flags
= 1;
7385 extent_op
->is_data
= 0;
7386 extent_op
->level
= level
;
7388 ret
= btrfs_add_delayed_tree_ref(root
->fs_info
, trans
,
7390 ins
.offset
, parent
, root_objectid
,
7391 level
, BTRFS_ADD_DELAYED_EXTENT
,
7393 BUG_ON(ret
); /* -ENOMEM */
7398 struct walk_control
{
7399 u64 refs
[BTRFS_MAX_LEVEL
];
7400 u64 flags
[BTRFS_MAX_LEVEL
];
7401 struct btrfs_key update_progress
;
7412 #define DROP_REFERENCE 1
7413 #define UPDATE_BACKREF 2
7415 static noinline
void reada_walk_down(struct btrfs_trans_handle
*trans
,
7416 struct btrfs_root
*root
,
7417 struct walk_control
*wc
,
7418 struct btrfs_path
*path
)
7426 struct btrfs_key key
;
7427 struct extent_buffer
*eb
;
7432 if (path
->slots
[wc
->level
] < wc
->reada_slot
) {
7433 wc
->reada_count
= wc
->reada_count
* 2 / 3;
7434 wc
->reada_count
= max(wc
->reada_count
, 2);
7436 wc
->reada_count
= wc
->reada_count
* 3 / 2;
7437 wc
->reada_count
= min_t(int, wc
->reada_count
,
7438 BTRFS_NODEPTRS_PER_BLOCK(root
));
7441 eb
= path
->nodes
[wc
->level
];
7442 nritems
= btrfs_header_nritems(eb
);
7443 blocksize
= root
->nodesize
;
7445 for (slot
= path
->slots
[wc
->level
]; slot
< nritems
; slot
++) {
7446 if (nread
>= wc
->reada_count
)
7450 bytenr
= btrfs_node_blockptr(eb
, slot
);
7451 generation
= btrfs_node_ptr_generation(eb
, slot
);
7453 if (slot
== path
->slots
[wc
->level
])
7456 if (wc
->stage
== UPDATE_BACKREF
&&
7457 generation
<= root
->root_key
.offset
)
7460 /* We don't lock the tree block, it's OK to be racy here */
7461 ret
= btrfs_lookup_extent_info(trans
, root
, bytenr
,
7462 wc
->level
- 1, 1, &refs
,
7464 /* We don't care about errors in readahead. */
7469 if (wc
->stage
== DROP_REFERENCE
) {
7473 if (wc
->level
== 1 &&
7474 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7476 if (!wc
->update_ref
||
7477 generation
<= root
->root_key
.offset
)
7479 btrfs_node_key_to_cpu(eb
, &key
, slot
);
7480 ret
= btrfs_comp_cpu_keys(&key
,
7481 &wc
->update_progress
);
7485 if (wc
->level
== 1 &&
7486 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7490 readahead_tree_block(root
, bytenr
, blocksize
);
7493 wc
->reada_slot
= slot
;
7496 static int account_leaf_items(struct btrfs_trans_handle
*trans
,
7497 struct btrfs_root
*root
,
7498 struct extent_buffer
*eb
)
7500 int nr
= btrfs_header_nritems(eb
);
7501 int i
, extent_type
, ret
;
7502 struct btrfs_key key
;
7503 struct btrfs_file_extent_item
*fi
;
7504 u64 bytenr
, num_bytes
;
7506 for (i
= 0; i
< nr
; i
++) {
7507 btrfs_item_key_to_cpu(eb
, &key
, i
);
7509 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
7512 fi
= btrfs_item_ptr(eb
, i
, struct btrfs_file_extent_item
);
7513 /* filter out non qgroup-accountable extents */
7514 extent_type
= btrfs_file_extent_type(eb
, fi
);
7516 if (extent_type
== BTRFS_FILE_EXTENT_INLINE
)
7519 bytenr
= btrfs_file_extent_disk_bytenr(eb
, fi
);
7523 num_bytes
= btrfs_file_extent_disk_num_bytes(eb
, fi
);
7525 ret
= btrfs_qgroup_record_ref(trans
, root
->fs_info
,
7528 BTRFS_QGROUP_OPER_SUB_SUBTREE
, 0);
7536 * Walk up the tree from the bottom, freeing leaves and any interior
7537 * nodes which have had all slots visited. If a node (leaf or
7538 * interior) is freed, the node above it will have it's slot
7539 * incremented. The root node will never be freed.
7541 * At the end of this function, we should have a path which has all
7542 * slots incremented to the next position for a search. If we need to
7543 * read a new node it will be NULL and the node above it will have the
7544 * correct slot selected for a later read.
7546 * If we increment the root nodes slot counter past the number of
7547 * elements, 1 is returned to signal completion of the search.
7549 static int adjust_slots_upwards(struct btrfs_root
*root
,
7550 struct btrfs_path
*path
, int root_level
)
7554 struct extent_buffer
*eb
;
7556 if (root_level
== 0)
7559 while (level
<= root_level
) {
7560 eb
= path
->nodes
[level
];
7561 nr
= btrfs_header_nritems(eb
);
7562 path
->slots
[level
]++;
7563 slot
= path
->slots
[level
];
7564 if (slot
>= nr
|| level
== 0) {
7566 * Don't free the root - we will detect this
7567 * condition after our loop and return a
7568 * positive value for caller to stop walking the tree.
7570 if (level
!= root_level
) {
7571 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7572 path
->locks
[level
] = 0;
7574 free_extent_buffer(eb
);
7575 path
->nodes
[level
] = NULL
;
7576 path
->slots
[level
] = 0;
7580 * We have a valid slot to walk back down
7581 * from. Stop here so caller can process these
7590 eb
= path
->nodes
[root_level
];
7591 if (path
->slots
[root_level
] >= btrfs_header_nritems(eb
))
7598 * root_eb is the subtree root and is locked before this function is called.
7600 static int account_shared_subtree(struct btrfs_trans_handle
*trans
,
7601 struct btrfs_root
*root
,
7602 struct extent_buffer
*root_eb
,
7608 struct extent_buffer
*eb
= root_eb
;
7609 struct btrfs_path
*path
= NULL
;
7611 BUG_ON(root_level
< 0 || root_level
> BTRFS_MAX_LEVEL
);
7612 BUG_ON(root_eb
== NULL
);
7614 if (!root
->fs_info
->quota_enabled
)
7617 if (!extent_buffer_uptodate(root_eb
)) {
7618 ret
= btrfs_read_buffer(root_eb
, root_gen
);
7623 if (root_level
== 0) {
7624 ret
= account_leaf_items(trans
, root
, root_eb
);
7628 path
= btrfs_alloc_path();
7633 * Walk down the tree. Missing extent blocks are filled in as
7634 * we go. Metadata is accounted every time we read a new
7637 * When we reach a leaf, we account for file extent items in it,
7638 * walk back up the tree (adjusting slot pointers as we go)
7639 * and restart the search process.
7641 extent_buffer_get(root_eb
); /* For path */
7642 path
->nodes
[root_level
] = root_eb
;
7643 path
->slots
[root_level
] = 0;
7644 path
->locks
[root_level
] = 0; /* so release_path doesn't try to unlock */
7647 while (level
>= 0) {
7648 if (path
->nodes
[level
] == NULL
) {
7653 /* We need to get child blockptr/gen from
7654 * parent before we can read it. */
7655 eb
= path
->nodes
[level
+ 1];
7656 parent_slot
= path
->slots
[level
+ 1];
7657 child_bytenr
= btrfs_node_blockptr(eb
, parent_slot
);
7658 child_gen
= btrfs_node_ptr_generation(eb
, parent_slot
);
7660 eb
= read_tree_block(root
, child_bytenr
, child_gen
);
7661 if (!eb
|| !extent_buffer_uptodate(eb
)) {
7666 path
->nodes
[level
] = eb
;
7667 path
->slots
[level
] = 0;
7669 btrfs_tree_read_lock(eb
);
7670 btrfs_set_lock_blocking_rw(eb
, BTRFS_READ_LOCK
);
7671 path
->locks
[level
] = BTRFS_READ_LOCK_BLOCKING
;
7673 ret
= btrfs_qgroup_record_ref(trans
, root
->fs_info
,
7677 BTRFS_QGROUP_OPER_SUB_SUBTREE
,
7685 ret
= account_leaf_items(trans
, root
, path
->nodes
[level
]);
7689 /* Nonzero return here means we completed our search */
7690 ret
= adjust_slots_upwards(root
, path
, root_level
);
7694 /* Restart search with new slots */
7703 btrfs_free_path(path
);
7709 * helper to process tree block while walking down the tree.
7711 * when wc->stage == UPDATE_BACKREF, this function updates
7712 * back refs for pointers in the block.
7714 * NOTE: return value 1 means we should stop walking down.
7716 static noinline
int walk_down_proc(struct btrfs_trans_handle
*trans
,
7717 struct btrfs_root
*root
,
7718 struct btrfs_path
*path
,
7719 struct walk_control
*wc
, int lookup_info
)
7721 int level
= wc
->level
;
7722 struct extent_buffer
*eb
= path
->nodes
[level
];
7723 u64 flag
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
7726 if (wc
->stage
== UPDATE_BACKREF
&&
7727 btrfs_header_owner(eb
) != root
->root_key
.objectid
)
7731 * when reference count of tree block is 1, it won't increase
7732 * again. once full backref flag is set, we never clear it.
7735 ((wc
->stage
== DROP_REFERENCE
&& wc
->refs
[level
] != 1) ||
7736 (wc
->stage
== UPDATE_BACKREF
&& !(wc
->flags
[level
] & flag
)))) {
7737 BUG_ON(!path
->locks
[level
]);
7738 ret
= btrfs_lookup_extent_info(trans
, root
,
7739 eb
->start
, level
, 1,
7742 BUG_ON(ret
== -ENOMEM
);
7745 BUG_ON(wc
->refs
[level
] == 0);
7748 if (wc
->stage
== DROP_REFERENCE
) {
7749 if (wc
->refs
[level
] > 1)
7752 if (path
->locks
[level
] && !wc
->keep_locks
) {
7753 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7754 path
->locks
[level
] = 0;
7759 /* wc->stage == UPDATE_BACKREF */
7760 if (!(wc
->flags
[level
] & flag
)) {
7761 BUG_ON(!path
->locks
[level
]);
7762 ret
= btrfs_inc_ref(trans
, root
, eb
, 1);
7763 BUG_ON(ret
); /* -ENOMEM */
7764 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
7765 BUG_ON(ret
); /* -ENOMEM */
7766 ret
= btrfs_set_disk_extent_flags(trans
, root
, eb
->start
,
7768 btrfs_header_level(eb
), 0);
7769 BUG_ON(ret
); /* -ENOMEM */
7770 wc
->flags
[level
] |= flag
;
7774 * the block is shared by multiple trees, so it's not good to
7775 * keep the tree lock
7777 if (path
->locks
[level
] && level
> 0) {
7778 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7779 path
->locks
[level
] = 0;
7785 * helper to process tree block pointer.
7787 * when wc->stage == DROP_REFERENCE, this function checks
7788 * reference count of the block pointed to. if the block
7789 * is shared and we need update back refs for the subtree
7790 * rooted at the block, this function changes wc->stage to
7791 * UPDATE_BACKREF. if the block is shared and there is no
7792 * need to update back, this function drops the reference
7795 * NOTE: return value 1 means we should stop walking down.
7797 static noinline
int do_walk_down(struct btrfs_trans_handle
*trans
,
7798 struct btrfs_root
*root
,
7799 struct btrfs_path
*path
,
7800 struct walk_control
*wc
, int *lookup_info
)
7806 struct btrfs_key key
;
7807 struct extent_buffer
*next
;
7808 int level
= wc
->level
;
7811 bool need_account
= false;
7813 generation
= btrfs_node_ptr_generation(path
->nodes
[level
],
7814 path
->slots
[level
]);
7816 * if the lower level block was created before the snapshot
7817 * was created, we know there is no need to update back refs
7820 if (wc
->stage
== UPDATE_BACKREF
&&
7821 generation
<= root
->root_key
.offset
) {
7826 bytenr
= btrfs_node_blockptr(path
->nodes
[level
], path
->slots
[level
]);
7827 blocksize
= root
->nodesize
;
7829 next
= btrfs_find_tree_block(root
, bytenr
);
7831 next
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
7834 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, next
,
7838 btrfs_tree_lock(next
);
7839 btrfs_set_lock_blocking(next
);
7841 ret
= btrfs_lookup_extent_info(trans
, root
, bytenr
, level
- 1, 1,
7842 &wc
->refs
[level
- 1],
7843 &wc
->flags
[level
- 1]);
7845 btrfs_tree_unlock(next
);
7849 if (unlikely(wc
->refs
[level
- 1] == 0)) {
7850 btrfs_err(root
->fs_info
, "Missing references.");
7855 if (wc
->stage
== DROP_REFERENCE
) {
7856 if (wc
->refs
[level
- 1] > 1) {
7857 need_account
= true;
7859 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7862 if (!wc
->update_ref
||
7863 generation
<= root
->root_key
.offset
)
7866 btrfs_node_key_to_cpu(path
->nodes
[level
], &key
,
7867 path
->slots
[level
]);
7868 ret
= btrfs_comp_cpu_keys(&key
, &wc
->update_progress
);
7872 wc
->stage
= UPDATE_BACKREF
;
7873 wc
->shared_level
= level
- 1;
7877 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7881 if (!btrfs_buffer_uptodate(next
, generation
, 0)) {
7882 btrfs_tree_unlock(next
);
7883 free_extent_buffer(next
);
7889 if (reada
&& level
== 1)
7890 reada_walk_down(trans
, root
, wc
, path
);
7891 next
= read_tree_block(root
, bytenr
, generation
);
7892 if (!next
|| !extent_buffer_uptodate(next
)) {
7893 free_extent_buffer(next
);
7896 btrfs_tree_lock(next
);
7897 btrfs_set_lock_blocking(next
);
7901 BUG_ON(level
!= btrfs_header_level(next
));
7902 path
->nodes
[level
] = next
;
7903 path
->slots
[level
] = 0;
7904 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
7910 wc
->refs
[level
- 1] = 0;
7911 wc
->flags
[level
- 1] = 0;
7912 if (wc
->stage
== DROP_REFERENCE
) {
7913 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
) {
7914 parent
= path
->nodes
[level
]->start
;
7916 BUG_ON(root
->root_key
.objectid
!=
7917 btrfs_header_owner(path
->nodes
[level
]));
7922 ret
= account_shared_subtree(trans
, root
, next
,
7923 generation
, level
- 1);
7925 printk_ratelimited(KERN_ERR
"BTRFS: %s Error "
7926 "%d accounting shared subtree. Quota "
7927 "is out of sync, rescan required.\n",
7928 root
->fs_info
->sb
->s_id
, ret
);
7931 ret
= btrfs_free_extent(trans
, root
, bytenr
, blocksize
, parent
,
7932 root
->root_key
.objectid
, level
- 1, 0, 0);
7933 BUG_ON(ret
); /* -ENOMEM */
7935 btrfs_tree_unlock(next
);
7936 free_extent_buffer(next
);
7942 * helper to process tree block while walking up the tree.
7944 * when wc->stage == DROP_REFERENCE, this function drops
7945 * reference count on the block.
7947 * when wc->stage == UPDATE_BACKREF, this function changes
7948 * wc->stage back to DROP_REFERENCE if we changed wc->stage
7949 * to UPDATE_BACKREF previously while processing the block.
7951 * NOTE: return value 1 means we should stop walking up.
7953 static noinline
int walk_up_proc(struct btrfs_trans_handle
*trans
,
7954 struct btrfs_root
*root
,
7955 struct btrfs_path
*path
,
7956 struct walk_control
*wc
)
7959 int level
= wc
->level
;
7960 struct extent_buffer
*eb
= path
->nodes
[level
];
7963 if (wc
->stage
== UPDATE_BACKREF
) {
7964 BUG_ON(wc
->shared_level
< level
);
7965 if (level
< wc
->shared_level
)
7968 ret
= find_next_key(path
, level
+ 1, &wc
->update_progress
);
7972 wc
->stage
= DROP_REFERENCE
;
7973 wc
->shared_level
= -1;
7974 path
->slots
[level
] = 0;
7977 * check reference count again if the block isn't locked.
7978 * we should start walking down the tree again if reference
7981 if (!path
->locks
[level
]) {
7983 btrfs_tree_lock(eb
);
7984 btrfs_set_lock_blocking(eb
);
7985 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
7987 ret
= btrfs_lookup_extent_info(trans
, root
,
7988 eb
->start
, level
, 1,
7992 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7993 path
->locks
[level
] = 0;
7996 BUG_ON(wc
->refs
[level
] == 0);
7997 if (wc
->refs
[level
] == 1) {
7998 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7999 path
->locks
[level
] = 0;
8005 /* wc->stage == DROP_REFERENCE */
8006 BUG_ON(wc
->refs
[level
] > 1 && !path
->locks
[level
]);
8008 if (wc
->refs
[level
] == 1) {
8010 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8011 ret
= btrfs_dec_ref(trans
, root
, eb
, 1);
8013 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
8014 BUG_ON(ret
); /* -ENOMEM */
8015 ret
= account_leaf_items(trans
, root
, eb
);
8017 printk_ratelimited(KERN_ERR
"BTRFS: %s Error "
8018 "%d accounting leaf items. Quota "
8019 "is out of sync, rescan required.\n",
8020 root
->fs_info
->sb
->s_id
, ret
);
8023 /* make block locked assertion in clean_tree_block happy */
8024 if (!path
->locks
[level
] &&
8025 btrfs_header_generation(eb
) == trans
->transid
) {
8026 btrfs_tree_lock(eb
);
8027 btrfs_set_lock_blocking(eb
);
8028 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8030 clean_tree_block(trans
, root
, eb
);
8033 if (eb
== root
->node
) {
8034 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8037 BUG_ON(root
->root_key
.objectid
!=
8038 btrfs_header_owner(eb
));
8040 if (wc
->flags
[level
+ 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8041 parent
= path
->nodes
[level
+ 1]->start
;
8043 BUG_ON(root
->root_key
.objectid
!=
8044 btrfs_header_owner(path
->nodes
[level
+ 1]));
8047 btrfs_free_tree_block(trans
, root
, eb
, parent
, wc
->refs
[level
] == 1);
8049 wc
->refs
[level
] = 0;
8050 wc
->flags
[level
] = 0;
8054 static noinline
int walk_down_tree(struct btrfs_trans_handle
*trans
,
8055 struct btrfs_root
*root
,
8056 struct btrfs_path
*path
,
8057 struct walk_control
*wc
)
8059 int level
= wc
->level
;
8060 int lookup_info
= 1;
8063 while (level
>= 0) {
8064 ret
= walk_down_proc(trans
, root
, path
, wc
, lookup_info
);
8071 if (path
->slots
[level
] >=
8072 btrfs_header_nritems(path
->nodes
[level
]))
8075 ret
= do_walk_down(trans
, root
, path
, wc
, &lookup_info
);
8077 path
->slots
[level
]++;
8086 static noinline
int walk_up_tree(struct btrfs_trans_handle
*trans
,
8087 struct btrfs_root
*root
,
8088 struct btrfs_path
*path
,
8089 struct walk_control
*wc
, int max_level
)
8091 int level
= wc
->level
;
8094 path
->slots
[level
] = btrfs_header_nritems(path
->nodes
[level
]);
8095 while (level
< max_level
&& path
->nodes
[level
]) {
8097 if (path
->slots
[level
] + 1 <
8098 btrfs_header_nritems(path
->nodes
[level
])) {
8099 path
->slots
[level
]++;
8102 ret
= walk_up_proc(trans
, root
, path
, wc
);
8106 if (path
->locks
[level
]) {
8107 btrfs_tree_unlock_rw(path
->nodes
[level
],
8108 path
->locks
[level
]);
8109 path
->locks
[level
] = 0;
8111 free_extent_buffer(path
->nodes
[level
]);
8112 path
->nodes
[level
] = NULL
;
8120 * drop a subvolume tree.
8122 * this function traverses the tree freeing any blocks that only
8123 * referenced by the tree.
8125 * when a shared tree block is found. this function decreases its
8126 * reference count by one. if update_ref is true, this function
8127 * also make sure backrefs for the shared block and all lower level
8128 * blocks are properly updated.
8130 * If called with for_reloc == 0, may exit early with -EAGAIN
8132 int btrfs_drop_snapshot(struct btrfs_root
*root
,
8133 struct btrfs_block_rsv
*block_rsv
, int update_ref
,
8136 struct btrfs_path
*path
;
8137 struct btrfs_trans_handle
*trans
;
8138 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
8139 struct btrfs_root_item
*root_item
= &root
->root_item
;
8140 struct walk_control
*wc
;
8141 struct btrfs_key key
;
8145 bool root_dropped
= false;
8147 btrfs_debug(root
->fs_info
, "Drop subvolume %llu", root
->objectid
);
8149 path
= btrfs_alloc_path();
8155 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
8157 btrfs_free_path(path
);
8162 trans
= btrfs_start_transaction(tree_root
, 0);
8163 if (IS_ERR(trans
)) {
8164 err
= PTR_ERR(trans
);
8169 trans
->block_rsv
= block_rsv
;
8171 if (btrfs_disk_key_objectid(&root_item
->drop_progress
) == 0) {
8172 level
= btrfs_header_level(root
->node
);
8173 path
->nodes
[level
] = btrfs_lock_root_node(root
);
8174 btrfs_set_lock_blocking(path
->nodes
[level
]);
8175 path
->slots
[level
] = 0;
8176 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8177 memset(&wc
->update_progress
, 0,
8178 sizeof(wc
->update_progress
));
8180 btrfs_disk_key_to_cpu(&key
, &root_item
->drop_progress
);
8181 memcpy(&wc
->update_progress
, &key
,
8182 sizeof(wc
->update_progress
));
8184 level
= root_item
->drop_level
;
8186 path
->lowest_level
= level
;
8187 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
8188 path
->lowest_level
= 0;
8196 * unlock our path, this is safe because only this
8197 * function is allowed to delete this snapshot
8199 btrfs_unlock_up_safe(path
, 0);
8201 level
= btrfs_header_level(root
->node
);
8203 btrfs_tree_lock(path
->nodes
[level
]);
8204 btrfs_set_lock_blocking(path
->nodes
[level
]);
8205 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8207 ret
= btrfs_lookup_extent_info(trans
, root
,
8208 path
->nodes
[level
]->start
,
8209 level
, 1, &wc
->refs
[level
],
8215 BUG_ON(wc
->refs
[level
] == 0);
8217 if (level
== root_item
->drop_level
)
8220 btrfs_tree_unlock(path
->nodes
[level
]);
8221 path
->locks
[level
] = 0;
8222 WARN_ON(wc
->refs
[level
] != 1);
8228 wc
->shared_level
= -1;
8229 wc
->stage
= DROP_REFERENCE
;
8230 wc
->update_ref
= update_ref
;
8232 wc
->for_reloc
= for_reloc
;
8233 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(root
);
8237 ret
= walk_down_tree(trans
, root
, path
, wc
);
8243 ret
= walk_up_tree(trans
, root
, path
, wc
, BTRFS_MAX_LEVEL
);
8250 BUG_ON(wc
->stage
!= DROP_REFERENCE
);
8254 if (wc
->stage
== DROP_REFERENCE
) {
8256 btrfs_node_key(path
->nodes
[level
],
8257 &root_item
->drop_progress
,
8258 path
->slots
[level
]);
8259 root_item
->drop_level
= level
;
8262 BUG_ON(wc
->level
== 0);
8263 if (btrfs_should_end_transaction(trans
, tree_root
) ||
8264 (!for_reloc
&& btrfs_need_cleaner_sleep(root
))) {
8265 ret
= btrfs_update_root(trans
, tree_root
,
8269 btrfs_abort_transaction(trans
, tree_root
, ret
);
8275 * Qgroup update accounting is run from
8276 * delayed ref handling. This usually works
8277 * out because delayed refs are normally the
8278 * only way qgroup updates are added. However,
8279 * we may have added updates during our tree
8280 * walk so run qgroups here to make sure we
8281 * don't lose any updates.
8283 ret
= btrfs_delayed_qgroup_accounting(trans
,
8286 printk_ratelimited(KERN_ERR
"BTRFS: Failure %d "
8287 "running qgroup updates "
8288 "during snapshot delete. "
8289 "Quota is out of sync, "
8290 "rescan required.\n", ret
);
8292 btrfs_end_transaction_throttle(trans
, tree_root
);
8293 if (!for_reloc
&& btrfs_need_cleaner_sleep(root
)) {
8294 pr_debug("BTRFS: drop snapshot early exit\n");
8299 trans
= btrfs_start_transaction(tree_root
, 0);
8300 if (IS_ERR(trans
)) {
8301 err
= PTR_ERR(trans
);
8305 trans
->block_rsv
= block_rsv
;
8308 btrfs_release_path(path
);
8312 ret
= btrfs_del_root(trans
, tree_root
, &root
->root_key
);
8314 btrfs_abort_transaction(trans
, tree_root
, ret
);
8318 if (root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
) {
8319 ret
= btrfs_find_root(tree_root
, &root
->root_key
, path
,
8322 btrfs_abort_transaction(trans
, tree_root
, ret
);
8325 } else if (ret
> 0) {
8326 /* if we fail to delete the orphan item this time
8327 * around, it'll get picked up the next time.
8329 * The most common failure here is just -ENOENT.
8331 btrfs_del_orphan_item(trans
, tree_root
,
8332 root
->root_key
.objectid
);
8336 if (test_bit(BTRFS_ROOT_IN_RADIX
, &root
->state
)) {
8337 btrfs_drop_and_free_fs_root(tree_root
->fs_info
, root
);
8339 free_extent_buffer(root
->node
);
8340 free_extent_buffer(root
->commit_root
);
8341 btrfs_put_fs_root(root
);
8343 root_dropped
= true;
8345 ret
= btrfs_delayed_qgroup_accounting(trans
, tree_root
->fs_info
);
8347 printk_ratelimited(KERN_ERR
"BTRFS: Failure %d "
8348 "running qgroup updates "
8349 "during snapshot delete. "
8350 "Quota is out of sync, "
8351 "rescan required.\n", ret
);
8353 btrfs_end_transaction_throttle(trans
, tree_root
);
8356 btrfs_free_path(path
);
8359 * So if we need to stop dropping the snapshot for whatever reason we
8360 * need to make sure to add it back to the dead root list so that we
8361 * keep trying to do the work later. This also cleans up roots if we
8362 * don't have it in the radix (like when we recover after a power fail
8363 * or unmount) so we don't leak memory.
8365 if (!for_reloc
&& root_dropped
== false)
8366 btrfs_add_dead_root(root
);
8367 if (err
&& err
!= -EAGAIN
)
8368 btrfs_std_error(root
->fs_info
, err
);
8373 * drop subtree rooted at tree block 'node'.
8375 * NOTE: this function will unlock and release tree block 'node'
8376 * only used by relocation code
8378 int btrfs_drop_subtree(struct btrfs_trans_handle
*trans
,
8379 struct btrfs_root
*root
,
8380 struct extent_buffer
*node
,
8381 struct extent_buffer
*parent
)
8383 struct btrfs_path
*path
;
8384 struct walk_control
*wc
;
8390 BUG_ON(root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
);
8392 path
= btrfs_alloc_path();
8396 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
8398 btrfs_free_path(path
);
8402 btrfs_assert_tree_locked(parent
);
8403 parent_level
= btrfs_header_level(parent
);
8404 extent_buffer_get(parent
);
8405 path
->nodes
[parent_level
] = parent
;
8406 path
->slots
[parent_level
] = btrfs_header_nritems(parent
);
8408 btrfs_assert_tree_locked(node
);
8409 level
= btrfs_header_level(node
);
8410 path
->nodes
[level
] = node
;
8411 path
->slots
[level
] = 0;
8412 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8414 wc
->refs
[parent_level
] = 1;
8415 wc
->flags
[parent_level
] = BTRFS_BLOCK_FLAG_FULL_BACKREF
;
8417 wc
->shared_level
= -1;
8418 wc
->stage
= DROP_REFERENCE
;
8422 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(root
);
8425 wret
= walk_down_tree(trans
, root
, path
, wc
);
8431 wret
= walk_up_tree(trans
, root
, path
, wc
, parent_level
);
8439 btrfs_free_path(path
);
8443 static u64
update_block_group_flags(struct btrfs_root
*root
, u64 flags
)
8449 * if restripe for this chunk_type is on pick target profile and
8450 * return, otherwise do the usual balance
8452 stripped
= get_restripe_target(root
->fs_info
, flags
);
8454 return extended_to_chunk(stripped
);
8456 num_devices
= root
->fs_info
->fs_devices
->rw_devices
;
8458 stripped
= BTRFS_BLOCK_GROUP_RAID0
|
8459 BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
|
8460 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID10
;
8462 if (num_devices
== 1) {
8463 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
8464 stripped
= flags
& ~stripped
;
8466 /* turn raid0 into single device chunks */
8467 if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
8470 /* turn mirroring into duplication */
8471 if (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
8472 BTRFS_BLOCK_GROUP_RAID10
))
8473 return stripped
| BTRFS_BLOCK_GROUP_DUP
;
8475 /* they already had raid on here, just return */
8476 if (flags
& stripped
)
8479 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
8480 stripped
= flags
& ~stripped
;
8482 /* switch duplicated blocks with raid1 */
8483 if (flags
& BTRFS_BLOCK_GROUP_DUP
)
8484 return stripped
| BTRFS_BLOCK_GROUP_RAID1
;
8486 /* this is drive concat, leave it alone */
8492 static int set_block_group_ro(struct btrfs_block_group_cache
*cache
, int force
)
8494 struct btrfs_space_info
*sinfo
= cache
->space_info
;
8496 u64 min_allocable_bytes
;
8501 * We need some metadata space and system metadata space for
8502 * allocating chunks in some corner cases until we force to set
8503 * it to be readonly.
8506 (BTRFS_BLOCK_GROUP_SYSTEM
| BTRFS_BLOCK_GROUP_METADATA
)) &&
8508 min_allocable_bytes
= 1 * 1024 * 1024;
8510 min_allocable_bytes
= 0;
8512 spin_lock(&sinfo
->lock
);
8513 spin_lock(&cache
->lock
);
8520 num_bytes
= cache
->key
.offset
- cache
->reserved
- cache
->pinned
-
8521 cache
->bytes_super
- btrfs_block_group_used(&cache
->item
);
8523 if (sinfo
->bytes_used
+ sinfo
->bytes_reserved
+ sinfo
->bytes_pinned
+
8524 sinfo
->bytes_may_use
+ sinfo
->bytes_readonly
+ num_bytes
+
8525 min_allocable_bytes
<= sinfo
->total_bytes
) {
8526 sinfo
->bytes_readonly
+= num_bytes
;
8531 spin_unlock(&cache
->lock
);
8532 spin_unlock(&sinfo
->lock
);
8536 int btrfs_set_block_group_ro(struct btrfs_root
*root
,
8537 struct btrfs_block_group_cache
*cache
)
8540 struct btrfs_trans_handle
*trans
;
8546 trans
= btrfs_join_transaction(root
);
8548 return PTR_ERR(trans
);
8550 alloc_flags
= update_block_group_flags(root
, cache
->flags
);
8551 if (alloc_flags
!= cache
->flags
) {
8552 ret
= do_chunk_alloc(trans
, root
, alloc_flags
,
8558 ret
= set_block_group_ro(cache
, 0);
8561 alloc_flags
= get_alloc_profile(root
, cache
->space_info
->flags
);
8562 ret
= do_chunk_alloc(trans
, root
, alloc_flags
,
8566 ret
= set_block_group_ro(cache
, 0);
8568 btrfs_end_transaction(trans
, root
);
8572 int btrfs_force_chunk_alloc(struct btrfs_trans_handle
*trans
,
8573 struct btrfs_root
*root
, u64 type
)
8575 u64 alloc_flags
= get_alloc_profile(root
, type
);
8576 return do_chunk_alloc(trans
, root
, alloc_flags
,
8581 * helper to account the unused space of all the readonly block group in the
8582 * list. takes mirrors into account.
8584 static u64
__btrfs_get_ro_block_group_free_space(struct list_head
*groups_list
)
8586 struct btrfs_block_group_cache
*block_group
;
8590 list_for_each_entry(block_group
, groups_list
, list
) {
8591 spin_lock(&block_group
->lock
);
8593 if (!block_group
->ro
) {
8594 spin_unlock(&block_group
->lock
);
8598 if (block_group
->flags
& (BTRFS_BLOCK_GROUP_RAID1
|
8599 BTRFS_BLOCK_GROUP_RAID10
|
8600 BTRFS_BLOCK_GROUP_DUP
))
8605 free_bytes
+= (block_group
->key
.offset
-
8606 btrfs_block_group_used(&block_group
->item
)) *
8609 spin_unlock(&block_group
->lock
);
8616 * helper to account the unused space of all the readonly block group in the
8617 * space_info. takes mirrors into account.
8619 u64
btrfs_account_ro_block_groups_free_space(struct btrfs_space_info
*sinfo
)
8624 spin_lock(&sinfo
->lock
);
8626 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++)
8627 if (!list_empty(&sinfo
->block_groups
[i
]))
8628 free_bytes
+= __btrfs_get_ro_block_group_free_space(
8629 &sinfo
->block_groups
[i
]);
8631 spin_unlock(&sinfo
->lock
);
8636 void btrfs_set_block_group_rw(struct btrfs_root
*root
,
8637 struct btrfs_block_group_cache
*cache
)
8639 struct btrfs_space_info
*sinfo
= cache
->space_info
;
8644 spin_lock(&sinfo
->lock
);
8645 spin_lock(&cache
->lock
);
8646 num_bytes
= cache
->key
.offset
- cache
->reserved
- cache
->pinned
-
8647 cache
->bytes_super
- btrfs_block_group_used(&cache
->item
);
8648 sinfo
->bytes_readonly
-= num_bytes
;
8650 spin_unlock(&cache
->lock
);
8651 spin_unlock(&sinfo
->lock
);
8655 * checks to see if its even possible to relocate this block group.
8657 * @return - -1 if it's not a good idea to relocate this block group, 0 if its
8658 * ok to go ahead and try.
8660 int btrfs_can_relocate(struct btrfs_root
*root
, u64 bytenr
)
8662 struct btrfs_block_group_cache
*block_group
;
8663 struct btrfs_space_info
*space_info
;
8664 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
8665 struct btrfs_device
*device
;
8666 struct btrfs_trans_handle
*trans
;
8675 block_group
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
8677 /* odd, couldn't find the block group, leave it alone */
8681 min_free
= btrfs_block_group_used(&block_group
->item
);
8683 /* no bytes used, we're good */
8687 space_info
= block_group
->space_info
;
8688 spin_lock(&space_info
->lock
);
8690 full
= space_info
->full
;
8693 * if this is the last block group we have in this space, we can't
8694 * relocate it unless we're able to allocate a new chunk below.
8696 * Otherwise, we need to make sure we have room in the space to handle
8697 * all of the extents from this block group. If we can, we're good
8699 if ((space_info
->total_bytes
!= block_group
->key
.offset
) &&
8700 (space_info
->bytes_used
+ space_info
->bytes_reserved
+
8701 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
8702 min_free
< space_info
->total_bytes
)) {
8703 spin_unlock(&space_info
->lock
);
8706 spin_unlock(&space_info
->lock
);
8709 * ok we don't have enough space, but maybe we have free space on our
8710 * devices to allocate new chunks for relocation, so loop through our
8711 * alloc devices and guess if we have enough space. if this block
8712 * group is going to be restriped, run checks against the target
8713 * profile instead of the current one.
8725 target
= get_restripe_target(root
->fs_info
, block_group
->flags
);
8727 index
= __get_raid_index(extended_to_chunk(target
));
8730 * this is just a balance, so if we were marked as full
8731 * we know there is no space for a new chunk
8736 index
= get_block_group_index(block_group
);
8739 if (index
== BTRFS_RAID_RAID10
) {
8743 } else if (index
== BTRFS_RAID_RAID1
) {
8745 } else if (index
== BTRFS_RAID_DUP
) {
8748 } else if (index
== BTRFS_RAID_RAID0
) {
8749 dev_min
= fs_devices
->rw_devices
;
8750 do_div(min_free
, dev_min
);
8753 /* We need to do this so that we can look at pending chunks */
8754 trans
= btrfs_join_transaction(root
);
8755 if (IS_ERR(trans
)) {
8756 ret
= PTR_ERR(trans
);
8760 mutex_lock(&root
->fs_info
->chunk_mutex
);
8761 list_for_each_entry(device
, &fs_devices
->alloc_list
, dev_alloc_list
) {
8765 * check to make sure we can actually find a chunk with enough
8766 * space to fit our block group in.
8768 if (device
->total_bytes
> device
->bytes_used
+ min_free
&&
8769 !device
->is_tgtdev_for_dev_replace
) {
8770 ret
= find_free_dev_extent(trans
, device
, min_free
,
8775 if (dev_nr
>= dev_min
)
8781 mutex_unlock(&root
->fs_info
->chunk_mutex
);
8782 btrfs_end_transaction(trans
, root
);
8784 btrfs_put_block_group(block_group
);
8788 static int find_first_block_group(struct btrfs_root
*root
,
8789 struct btrfs_path
*path
, struct btrfs_key
*key
)
8792 struct btrfs_key found_key
;
8793 struct extent_buffer
*leaf
;
8796 ret
= btrfs_search_slot(NULL
, root
, key
, path
, 0, 0);
8801 slot
= path
->slots
[0];
8802 leaf
= path
->nodes
[0];
8803 if (slot
>= btrfs_header_nritems(leaf
)) {
8804 ret
= btrfs_next_leaf(root
, path
);
8811 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
8813 if (found_key
.objectid
>= key
->objectid
&&
8814 found_key
.type
== BTRFS_BLOCK_GROUP_ITEM_KEY
) {
8824 void btrfs_put_block_group_cache(struct btrfs_fs_info
*info
)
8826 struct btrfs_block_group_cache
*block_group
;
8830 struct inode
*inode
;
8832 block_group
= btrfs_lookup_first_block_group(info
, last
);
8833 while (block_group
) {
8834 spin_lock(&block_group
->lock
);
8835 if (block_group
->iref
)
8837 spin_unlock(&block_group
->lock
);
8838 block_group
= next_block_group(info
->tree_root
,
8848 inode
= block_group
->inode
;
8849 block_group
->iref
= 0;
8850 block_group
->inode
= NULL
;
8851 spin_unlock(&block_group
->lock
);
8853 last
= block_group
->key
.objectid
+ block_group
->key
.offset
;
8854 btrfs_put_block_group(block_group
);
8858 int btrfs_free_block_groups(struct btrfs_fs_info
*info
)
8860 struct btrfs_block_group_cache
*block_group
;
8861 struct btrfs_space_info
*space_info
;
8862 struct btrfs_caching_control
*caching_ctl
;
8865 down_write(&info
->commit_root_sem
);
8866 while (!list_empty(&info
->caching_block_groups
)) {
8867 caching_ctl
= list_entry(info
->caching_block_groups
.next
,
8868 struct btrfs_caching_control
, list
);
8869 list_del(&caching_ctl
->list
);
8870 put_caching_control(caching_ctl
);
8872 up_write(&info
->commit_root_sem
);
8874 spin_lock(&info
->unused_bgs_lock
);
8875 while (!list_empty(&info
->unused_bgs
)) {
8876 block_group
= list_first_entry(&info
->unused_bgs
,
8877 struct btrfs_block_group_cache
,
8879 list_del_init(&block_group
->bg_list
);
8880 btrfs_put_block_group(block_group
);
8882 spin_unlock(&info
->unused_bgs_lock
);
8884 spin_lock(&info
->block_group_cache_lock
);
8885 while ((n
= rb_last(&info
->block_group_cache_tree
)) != NULL
) {
8886 block_group
= rb_entry(n
, struct btrfs_block_group_cache
,
8888 rb_erase(&block_group
->cache_node
,
8889 &info
->block_group_cache_tree
);
8890 spin_unlock(&info
->block_group_cache_lock
);
8892 down_write(&block_group
->space_info
->groups_sem
);
8893 list_del(&block_group
->list
);
8894 up_write(&block_group
->space_info
->groups_sem
);
8896 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
8897 wait_block_group_cache_done(block_group
);
8900 * We haven't cached this block group, which means we could
8901 * possibly have excluded extents on this block group.
8903 if (block_group
->cached
== BTRFS_CACHE_NO
||
8904 block_group
->cached
== BTRFS_CACHE_ERROR
)
8905 free_excluded_extents(info
->extent_root
, block_group
);
8907 btrfs_remove_free_space_cache(block_group
);
8908 btrfs_put_block_group(block_group
);
8910 spin_lock(&info
->block_group_cache_lock
);
8912 spin_unlock(&info
->block_group_cache_lock
);
8914 /* now that all the block groups are freed, go through and
8915 * free all the space_info structs. This is only called during
8916 * the final stages of unmount, and so we know nobody is
8917 * using them. We call synchronize_rcu() once before we start,
8918 * just to be on the safe side.
8922 release_global_block_rsv(info
);
8924 while (!list_empty(&info
->space_info
)) {
8927 space_info
= list_entry(info
->space_info
.next
,
8928 struct btrfs_space_info
,
8930 if (btrfs_test_opt(info
->tree_root
, ENOSPC_DEBUG
)) {
8931 if (WARN_ON(space_info
->bytes_pinned
> 0 ||
8932 space_info
->bytes_reserved
> 0 ||
8933 space_info
->bytes_may_use
> 0)) {
8934 dump_space_info(space_info
, 0, 0);
8937 list_del(&space_info
->list
);
8938 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++) {
8939 struct kobject
*kobj
;
8940 kobj
= space_info
->block_group_kobjs
[i
];
8941 space_info
->block_group_kobjs
[i
] = NULL
;
8947 kobject_del(&space_info
->kobj
);
8948 kobject_put(&space_info
->kobj
);
8953 static void __link_block_group(struct btrfs_space_info
*space_info
,
8954 struct btrfs_block_group_cache
*cache
)
8956 int index
= get_block_group_index(cache
);
8959 down_write(&space_info
->groups_sem
);
8960 if (list_empty(&space_info
->block_groups
[index
]))
8962 list_add_tail(&cache
->list
, &space_info
->block_groups
[index
]);
8963 up_write(&space_info
->groups_sem
);
8966 struct raid_kobject
*rkobj
;
8969 rkobj
= kzalloc(sizeof(*rkobj
), GFP_NOFS
);
8972 rkobj
->raid_type
= index
;
8973 kobject_init(&rkobj
->kobj
, &btrfs_raid_ktype
);
8974 ret
= kobject_add(&rkobj
->kobj
, &space_info
->kobj
,
8975 "%s", get_raid_name(index
));
8977 kobject_put(&rkobj
->kobj
);
8980 space_info
->block_group_kobjs
[index
] = &rkobj
->kobj
;
8985 pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n");
8988 static struct btrfs_block_group_cache
*
8989 btrfs_create_block_group_cache(struct btrfs_root
*root
, u64 start
, u64 size
)
8991 struct btrfs_block_group_cache
*cache
;
8993 cache
= kzalloc(sizeof(*cache
), GFP_NOFS
);
8997 cache
->free_space_ctl
= kzalloc(sizeof(*cache
->free_space_ctl
),
8999 if (!cache
->free_space_ctl
) {
9004 cache
->key
.objectid
= start
;
9005 cache
->key
.offset
= size
;
9006 cache
->key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
9008 cache
->sectorsize
= root
->sectorsize
;
9009 cache
->fs_info
= root
->fs_info
;
9010 cache
->full_stripe_len
= btrfs_full_stripe_len(root
,
9011 &root
->fs_info
->mapping_tree
,
9013 atomic_set(&cache
->count
, 1);
9014 spin_lock_init(&cache
->lock
);
9015 init_rwsem(&cache
->data_rwsem
);
9016 INIT_LIST_HEAD(&cache
->list
);
9017 INIT_LIST_HEAD(&cache
->cluster_list
);
9018 INIT_LIST_HEAD(&cache
->bg_list
);
9019 btrfs_init_free_space_ctl(cache
);
9024 int btrfs_read_block_groups(struct btrfs_root
*root
)
9026 struct btrfs_path
*path
;
9028 struct btrfs_block_group_cache
*cache
;
9029 struct btrfs_fs_info
*info
= root
->fs_info
;
9030 struct btrfs_space_info
*space_info
;
9031 struct btrfs_key key
;
9032 struct btrfs_key found_key
;
9033 struct extent_buffer
*leaf
;
9037 root
= info
->extent_root
;
9040 key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
9041 path
= btrfs_alloc_path();
9046 cache_gen
= btrfs_super_cache_generation(root
->fs_info
->super_copy
);
9047 if (btrfs_test_opt(root
, SPACE_CACHE
) &&
9048 btrfs_super_generation(root
->fs_info
->super_copy
) != cache_gen
)
9050 if (btrfs_test_opt(root
, CLEAR_CACHE
))
9054 ret
= find_first_block_group(root
, path
, &key
);
9060 leaf
= path
->nodes
[0];
9061 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
9063 cache
= btrfs_create_block_group_cache(root
, found_key
.objectid
,
9072 * When we mount with old space cache, we need to
9073 * set BTRFS_DC_CLEAR and set dirty flag.
9075 * a) Setting 'BTRFS_DC_CLEAR' makes sure that we
9076 * truncate the old free space cache inode and
9078 * b) Setting 'dirty flag' makes sure that we flush
9079 * the new space cache info onto disk.
9081 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
9082 if (btrfs_test_opt(root
, SPACE_CACHE
))
9086 read_extent_buffer(leaf
, &cache
->item
,
9087 btrfs_item_ptr_offset(leaf
, path
->slots
[0]),
9088 sizeof(cache
->item
));
9089 cache
->flags
= btrfs_block_group_flags(&cache
->item
);
9091 key
.objectid
= found_key
.objectid
+ found_key
.offset
;
9092 btrfs_release_path(path
);
9095 * We need to exclude the super stripes now so that the space
9096 * info has super bytes accounted for, otherwise we'll think
9097 * we have more space than we actually do.
9099 ret
= exclude_super_stripes(root
, cache
);
9102 * We may have excluded something, so call this just in
9105 free_excluded_extents(root
, cache
);
9106 btrfs_put_block_group(cache
);
9111 * check for two cases, either we are full, and therefore
9112 * don't need to bother with the caching work since we won't
9113 * find any space, or we are empty, and we can just add all
9114 * the space in and be done with it. This saves us _alot_ of
9115 * time, particularly in the full case.
9117 if (found_key
.offset
== btrfs_block_group_used(&cache
->item
)) {
9118 cache
->last_byte_to_unpin
= (u64
)-1;
9119 cache
->cached
= BTRFS_CACHE_FINISHED
;
9120 free_excluded_extents(root
, cache
);
9121 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
9122 cache
->last_byte_to_unpin
= (u64
)-1;
9123 cache
->cached
= BTRFS_CACHE_FINISHED
;
9124 add_new_free_space(cache
, root
->fs_info
,
9126 found_key
.objectid
+
9128 free_excluded_extents(root
, cache
);
9131 ret
= btrfs_add_block_group_cache(root
->fs_info
, cache
);
9133 btrfs_remove_free_space_cache(cache
);
9134 btrfs_put_block_group(cache
);
9138 ret
= update_space_info(info
, cache
->flags
, found_key
.offset
,
9139 btrfs_block_group_used(&cache
->item
),
9142 btrfs_remove_free_space_cache(cache
);
9143 spin_lock(&info
->block_group_cache_lock
);
9144 rb_erase(&cache
->cache_node
,
9145 &info
->block_group_cache_tree
);
9146 spin_unlock(&info
->block_group_cache_lock
);
9147 btrfs_put_block_group(cache
);
9151 cache
->space_info
= space_info
;
9152 spin_lock(&cache
->space_info
->lock
);
9153 cache
->space_info
->bytes_readonly
+= cache
->bytes_super
;
9154 spin_unlock(&cache
->space_info
->lock
);
9156 __link_block_group(space_info
, cache
);
9158 set_avail_alloc_bits(root
->fs_info
, cache
->flags
);
9159 if (btrfs_chunk_readonly(root
, cache
->key
.objectid
)) {
9160 set_block_group_ro(cache
, 1);
9161 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
9162 spin_lock(&info
->unused_bgs_lock
);
9163 /* Should always be true but just in case. */
9164 if (list_empty(&cache
->bg_list
)) {
9165 btrfs_get_block_group(cache
);
9166 list_add_tail(&cache
->bg_list
,
9169 spin_unlock(&info
->unused_bgs_lock
);
9173 list_for_each_entry_rcu(space_info
, &root
->fs_info
->space_info
, list
) {
9174 if (!(get_alloc_profile(root
, space_info
->flags
) &
9175 (BTRFS_BLOCK_GROUP_RAID10
|
9176 BTRFS_BLOCK_GROUP_RAID1
|
9177 BTRFS_BLOCK_GROUP_RAID5
|
9178 BTRFS_BLOCK_GROUP_RAID6
|
9179 BTRFS_BLOCK_GROUP_DUP
)))
9182 * avoid allocating from un-mirrored block group if there are
9183 * mirrored block groups.
9185 list_for_each_entry(cache
,
9186 &space_info
->block_groups
[BTRFS_RAID_RAID0
],
9188 set_block_group_ro(cache
, 1);
9189 list_for_each_entry(cache
,
9190 &space_info
->block_groups
[BTRFS_RAID_SINGLE
],
9192 set_block_group_ro(cache
, 1);
9195 init_global_block_rsv(info
);
9198 btrfs_free_path(path
);
9202 void btrfs_create_pending_block_groups(struct btrfs_trans_handle
*trans
,
9203 struct btrfs_root
*root
)
9205 struct btrfs_block_group_cache
*block_group
, *tmp
;
9206 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
9207 struct btrfs_block_group_item item
;
9208 struct btrfs_key key
;
9211 list_for_each_entry_safe(block_group
, tmp
, &trans
->new_bgs
, bg_list
) {
9212 list_del_init(&block_group
->bg_list
);
9216 spin_lock(&block_group
->lock
);
9217 memcpy(&item
, &block_group
->item
, sizeof(item
));
9218 memcpy(&key
, &block_group
->key
, sizeof(key
));
9219 spin_unlock(&block_group
->lock
);
9221 ret
= btrfs_insert_item(trans
, extent_root
, &key
, &item
,
9224 btrfs_abort_transaction(trans
, extent_root
, ret
);
9225 ret
= btrfs_finish_chunk_alloc(trans
, extent_root
,
9226 key
.objectid
, key
.offset
);
9228 btrfs_abort_transaction(trans
, extent_root
, ret
);
9232 int btrfs_make_block_group(struct btrfs_trans_handle
*trans
,
9233 struct btrfs_root
*root
, u64 bytes_used
,
9234 u64 type
, u64 chunk_objectid
, u64 chunk_offset
,
9238 struct btrfs_root
*extent_root
;
9239 struct btrfs_block_group_cache
*cache
;
9241 extent_root
= root
->fs_info
->extent_root
;
9243 btrfs_set_log_full_commit(root
->fs_info
, trans
);
9245 cache
= btrfs_create_block_group_cache(root
, chunk_offset
, size
);
9249 btrfs_set_block_group_used(&cache
->item
, bytes_used
);
9250 btrfs_set_block_group_chunk_objectid(&cache
->item
, chunk_objectid
);
9251 btrfs_set_block_group_flags(&cache
->item
, type
);
9253 cache
->flags
= type
;
9254 cache
->last_byte_to_unpin
= (u64
)-1;
9255 cache
->cached
= BTRFS_CACHE_FINISHED
;
9256 ret
= exclude_super_stripes(root
, cache
);
9259 * We may have excluded something, so call this just in
9262 free_excluded_extents(root
, cache
);
9263 btrfs_put_block_group(cache
);
9267 add_new_free_space(cache
, root
->fs_info
, chunk_offset
,
9268 chunk_offset
+ size
);
9270 free_excluded_extents(root
, cache
);
9272 ret
= btrfs_add_block_group_cache(root
->fs_info
, cache
);
9274 btrfs_remove_free_space_cache(cache
);
9275 btrfs_put_block_group(cache
);
9279 ret
= update_space_info(root
->fs_info
, cache
->flags
, size
, bytes_used
,
9280 &cache
->space_info
);
9282 btrfs_remove_free_space_cache(cache
);
9283 spin_lock(&root
->fs_info
->block_group_cache_lock
);
9284 rb_erase(&cache
->cache_node
,
9285 &root
->fs_info
->block_group_cache_tree
);
9286 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
9287 btrfs_put_block_group(cache
);
9290 update_global_block_rsv(root
->fs_info
);
9292 spin_lock(&cache
->space_info
->lock
);
9293 cache
->space_info
->bytes_readonly
+= cache
->bytes_super
;
9294 spin_unlock(&cache
->space_info
->lock
);
9296 __link_block_group(cache
->space_info
, cache
);
9298 list_add_tail(&cache
->bg_list
, &trans
->new_bgs
);
9300 set_avail_alloc_bits(extent_root
->fs_info
, type
);
9305 static void clear_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
9307 u64 extra_flags
= chunk_to_extended(flags
) &
9308 BTRFS_EXTENDED_PROFILE_MASK
;
9310 write_seqlock(&fs_info
->profiles_lock
);
9311 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
9312 fs_info
->avail_data_alloc_bits
&= ~extra_flags
;
9313 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
9314 fs_info
->avail_metadata_alloc_bits
&= ~extra_flags
;
9315 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
9316 fs_info
->avail_system_alloc_bits
&= ~extra_flags
;
9317 write_sequnlock(&fs_info
->profiles_lock
);
9320 int btrfs_remove_block_group(struct btrfs_trans_handle
*trans
,
9321 struct btrfs_root
*root
, u64 group_start
)
9323 struct btrfs_path
*path
;
9324 struct btrfs_block_group_cache
*block_group
;
9325 struct btrfs_free_cluster
*cluster
;
9326 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
9327 struct btrfs_key key
;
9328 struct inode
*inode
;
9329 struct kobject
*kobj
= NULL
;
9334 root
= root
->fs_info
->extent_root
;
9336 block_group
= btrfs_lookup_block_group(root
->fs_info
, group_start
);
9337 BUG_ON(!block_group
);
9338 BUG_ON(!block_group
->ro
);
9341 * Free the reserved super bytes from this block group before
9344 free_excluded_extents(root
, block_group
);
9346 memcpy(&key
, &block_group
->key
, sizeof(key
));
9347 index
= get_block_group_index(block_group
);
9348 if (block_group
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
9349 BTRFS_BLOCK_GROUP_RAID1
|
9350 BTRFS_BLOCK_GROUP_RAID10
))
9355 /* make sure this block group isn't part of an allocation cluster */
9356 cluster
= &root
->fs_info
->data_alloc_cluster
;
9357 spin_lock(&cluster
->refill_lock
);
9358 btrfs_return_cluster_to_free_space(block_group
, cluster
);
9359 spin_unlock(&cluster
->refill_lock
);
9362 * make sure this block group isn't part of a metadata
9363 * allocation cluster
9365 cluster
= &root
->fs_info
->meta_alloc_cluster
;
9366 spin_lock(&cluster
->refill_lock
);
9367 btrfs_return_cluster_to_free_space(block_group
, cluster
);
9368 spin_unlock(&cluster
->refill_lock
);
9370 path
= btrfs_alloc_path();
9376 inode
= lookup_free_space_inode(tree_root
, block_group
, path
);
9377 if (!IS_ERR(inode
)) {
9378 ret
= btrfs_orphan_add(trans
, inode
);
9380 btrfs_add_delayed_iput(inode
);
9384 /* One for the block groups ref */
9385 spin_lock(&block_group
->lock
);
9386 if (block_group
->iref
) {
9387 block_group
->iref
= 0;
9388 block_group
->inode
= NULL
;
9389 spin_unlock(&block_group
->lock
);
9392 spin_unlock(&block_group
->lock
);
9394 /* One for our lookup ref */
9395 btrfs_add_delayed_iput(inode
);
9398 key
.objectid
= BTRFS_FREE_SPACE_OBJECTID
;
9399 key
.offset
= block_group
->key
.objectid
;
9402 ret
= btrfs_search_slot(trans
, tree_root
, &key
, path
, -1, 1);
9406 btrfs_release_path(path
);
9408 ret
= btrfs_del_item(trans
, tree_root
, path
);
9411 btrfs_release_path(path
);
9414 spin_lock(&root
->fs_info
->block_group_cache_lock
);
9415 rb_erase(&block_group
->cache_node
,
9416 &root
->fs_info
->block_group_cache_tree
);
9418 if (root
->fs_info
->first_logical_byte
== block_group
->key
.objectid
)
9419 root
->fs_info
->first_logical_byte
= (u64
)-1;
9420 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
9422 down_write(&block_group
->space_info
->groups_sem
);
9424 * we must use list_del_init so people can check to see if they
9425 * are still on the list after taking the semaphore
9427 list_del_init(&block_group
->list
);
9428 if (list_empty(&block_group
->space_info
->block_groups
[index
])) {
9429 kobj
= block_group
->space_info
->block_group_kobjs
[index
];
9430 block_group
->space_info
->block_group_kobjs
[index
] = NULL
;
9431 clear_avail_alloc_bits(root
->fs_info
, block_group
->flags
);
9433 up_write(&block_group
->space_info
->groups_sem
);
9439 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
9440 wait_block_group_cache_done(block_group
);
9442 btrfs_remove_free_space_cache(block_group
);
9444 spin_lock(&block_group
->space_info
->lock
);
9445 block_group
->space_info
->total_bytes
-= block_group
->key
.offset
;
9446 block_group
->space_info
->bytes_readonly
-= block_group
->key
.offset
;
9447 block_group
->space_info
->disk_total
-= block_group
->key
.offset
* factor
;
9448 spin_unlock(&block_group
->space_info
->lock
);
9450 memcpy(&key
, &block_group
->key
, sizeof(key
));
9452 btrfs_put_block_group(block_group
);
9453 btrfs_put_block_group(block_group
);
9455 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
9461 ret
= btrfs_del_item(trans
, root
, path
);
9463 btrfs_free_path(path
);
9468 * Process the unused_bgs list and remove any that don't have any allocated
9469 * space inside of them.
9471 void btrfs_delete_unused_bgs(struct btrfs_fs_info
*fs_info
)
9473 struct btrfs_block_group_cache
*block_group
;
9474 struct btrfs_space_info
*space_info
;
9475 struct btrfs_root
*root
= fs_info
->extent_root
;
9476 struct btrfs_trans_handle
*trans
;
9482 spin_lock(&fs_info
->unused_bgs_lock
);
9483 while (!list_empty(&fs_info
->unused_bgs
)) {
9486 block_group
= list_first_entry(&fs_info
->unused_bgs
,
9487 struct btrfs_block_group_cache
,
9489 space_info
= block_group
->space_info
;
9490 list_del_init(&block_group
->bg_list
);
9491 if (ret
|| btrfs_mixed_space_info(space_info
)) {
9492 btrfs_put_block_group(block_group
);
9495 spin_unlock(&fs_info
->unused_bgs_lock
);
9497 /* Don't want to race with allocators so take the groups_sem */
9498 down_write(&space_info
->groups_sem
);
9499 spin_lock(&block_group
->lock
);
9500 if (block_group
->reserved
||
9501 btrfs_block_group_used(&block_group
->item
) ||
9504 * We want to bail if we made new allocations or have
9505 * outstanding allocations in this block group. We do
9506 * the ro check in case balance is currently acting on
9509 spin_unlock(&block_group
->lock
);
9510 up_write(&space_info
->groups_sem
);
9513 spin_unlock(&block_group
->lock
);
9515 /* We don't want to force the issue, only flip if it's ok. */
9516 ret
= set_block_group_ro(block_group
, 0);
9517 up_write(&space_info
->groups_sem
);
9524 * Want to do this before we do anything else so we can recover
9525 * properly if we fail to join the transaction.
9527 trans
= btrfs_join_transaction(root
);
9528 if (IS_ERR(trans
)) {
9529 btrfs_set_block_group_rw(root
, block_group
);
9530 ret
= PTR_ERR(trans
);
9535 * We could have pending pinned extents for this block group,
9536 * just delete them, we don't care about them anymore.
9538 start
= block_group
->key
.objectid
;
9539 end
= start
+ block_group
->key
.offset
- 1;
9540 clear_extent_bits(&fs_info
->freed_extents
[0], start
, end
,
9541 EXTENT_DIRTY
, GFP_NOFS
);
9542 clear_extent_bits(&fs_info
->freed_extents
[1], start
, end
,
9543 EXTENT_DIRTY
, GFP_NOFS
);
9545 /* Reset pinned so btrfs_put_block_group doesn't complain */
9546 block_group
->pinned
= 0;
9549 * Btrfs_remove_chunk will abort the transaction if things go
9552 ret
= btrfs_remove_chunk(trans
, root
,
9553 block_group
->key
.objectid
);
9554 btrfs_end_transaction(trans
, root
);
9556 btrfs_put_block_group(block_group
);
9557 spin_lock(&fs_info
->unused_bgs_lock
);
9559 spin_unlock(&fs_info
->unused_bgs_lock
);
9562 int btrfs_init_space_info(struct btrfs_fs_info
*fs_info
)
9564 struct btrfs_space_info
*space_info
;
9565 struct btrfs_super_block
*disk_super
;
9571 disk_super
= fs_info
->super_copy
;
9572 if (!btrfs_super_root(disk_super
))
9575 features
= btrfs_super_incompat_flags(disk_super
);
9576 if (features
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
)
9579 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
9580 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9585 flags
= BTRFS_BLOCK_GROUP_METADATA
| BTRFS_BLOCK_GROUP_DATA
;
9586 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9588 flags
= BTRFS_BLOCK_GROUP_METADATA
;
9589 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9593 flags
= BTRFS_BLOCK_GROUP_DATA
;
9594 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9600 int btrfs_error_unpin_extent_range(struct btrfs_root
*root
, u64 start
, u64 end
)
9602 return unpin_extent_range(root
, start
, end
);
9605 int btrfs_error_discard_extent(struct btrfs_root
*root
, u64 bytenr
,
9606 u64 num_bytes
, u64
*actual_bytes
)
9608 return btrfs_discard_extent(root
, bytenr
, num_bytes
, actual_bytes
);
9611 int btrfs_trim_fs(struct btrfs_root
*root
, struct fstrim_range
*range
)
9613 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
9614 struct btrfs_block_group_cache
*cache
= NULL
;
9619 u64 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
9623 * try to trim all FS space, our block group may start from non-zero.
9625 if (range
->len
== total_bytes
)
9626 cache
= btrfs_lookup_first_block_group(fs_info
, range
->start
);
9628 cache
= btrfs_lookup_block_group(fs_info
, range
->start
);
9631 if (cache
->key
.objectid
>= (range
->start
+ range
->len
)) {
9632 btrfs_put_block_group(cache
);
9636 start
= max(range
->start
, cache
->key
.objectid
);
9637 end
= min(range
->start
+ range
->len
,
9638 cache
->key
.objectid
+ cache
->key
.offset
);
9640 if (end
- start
>= range
->minlen
) {
9641 if (!block_group_cache_done(cache
)) {
9642 ret
= cache_block_group(cache
, 0);
9644 btrfs_put_block_group(cache
);
9647 ret
= wait_block_group_cache_done(cache
);
9649 btrfs_put_block_group(cache
);
9653 ret
= btrfs_trim_block_group(cache
,
9659 trimmed
+= group_trimmed
;
9661 btrfs_put_block_group(cache
);
9666 cache
= next_block_group(fs_info
->tree_root
, cache
);
9669 range
->len
= trimmed
;
9674 * btrfs_{start,end}_write() is similar to mnt_{want, drop}_write(),
9675 * they are used to prevent the some tasks writing data into the page cache
9676 * by nocow before the subvolume is snapshoted, but flush the data into
9677 * the disk after the snapshot creation.
9679 void btrfs_end_nocow_write(struct btrfs_root
*root
)
9681 percpu_counter_dec(&root
->subv_writers
->counter
);
9683 * Make sure counter is updated before we wake up
9687 if (waitqueue_active(&root
->subv_writers
->wait
))
9688 wake_up(&root
->subv_writers
->wait
);
9691 int btrfs_start_nocow_write(struct btrfs_root
*root
)
9693 if (atomic_read(&root
->will_be_snapshoted
))
9696 percpu_counter_inc(&root
->subv_writers
->counter
);
9698 * Make sure counter is updated before we check for snapshot creation.
9701 if (atomic_read(&root
->will_be_snapshoted
)) {
9702 btrfs_end_nocow_write(root
);