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
;
610 cache
->has_caching_ctl
= 1;
613 spin_unlock(&cache
->lock
);
614 wake_up(&caching_ctl
->wait
);
616 put_caching_control(caching_ctl
);
617 free_excluded_extents(fs_info
->extent_root
, cache
);
622 * We are not going to do the fast caching, set cached to the
623 * appropriate value and wakeup any waiters.
625 spin_lock(&cache
->lock
);
626 if (load_cache_only
) {
627 cache
->caching_ctl
= NULL
;
628 cache
->cached
= BTRFS_CACHE_NO
;
630 cache
->cached
= BTRFS_CACHE_STARTED
;
631 cache
->has_caching_ctl
= 1;
633 spin_unlock(&cache
->lock
);
634 wake_up(&caching_ctl
->wait
);
637 if (load_cache_only
) {
638 put_caching_control(caching_ctl
);
642 down_write(&fs_info
->commit_root_sem
);
643 atomic_inc(&caching_ctl
->count
);
644 list_add_tail(&caching_ctl
->list
, &fs_info
->caching_block_groups
);
645 up_write(&fs_info
->commit_root_sem
);
647 btrfs_get_block_group(cache
);
649 btrfs_queue_work(fs_info
->caching_workers
, &caching_ctl
->work
);
655 * return the block group that starts at or after bytenr
657 static struct btrfs_block_group_cache
*
658 btrfs_lookup_first_block_group(struct btrfs_fs_info
*info
, u64 bytenr
)
660 struct btrfs_block_group_cache
*cache
;
662 cache
= block_group_cache_tree_search(info
, bytenr
, 0);
668 * return the block group that contains the given bytenr
670 struct btrfs_block_group_cache
*btrfs_lookup_block_group(
671 struct btrfs_fs_info
*info
,
674 struct btrfs_block_group_cache
*cache
;
676 cache
= block_group_cache_tree_search(info
, bytenr
, 1);
681 static struct btrfs_space_info
*__find_space_info(struct btrfs_fs_info
*info
,
684 struct list_head
*head
= &info
->space_info
;
685 struct btrfs_space_info
*found
;
687 flags
&= BTRFS_BLOCK_GROUP_TYPE_MASK
;
690 list_for_each_entry_rcu(found
, head
, list
) {
691 if (found
->flags
& flags
) {
701 * after adding space to the filesystem, we need to clear the full flags
702 * on all the space infos.
704 void btrfs_clear_space_info_full(struct btrfs_fs_info
*info
)
706 struct list_head
*head
= &info
->space_info
;
707 struct btrfs_space_info
*found
;
710 list_for_each_entry_rcu(found
, head
, list
)
715 /* simple helper to search for an existing data extent at a given offset */
716 int btrfs_lookup_data_extent(struct btrfs_root
*root
, u64 start
, u64 len
)
719 struct btrfs_key key
;
720 struct btrfs_path
*path
;
722 path
= btrfs_alloc_path();
726 key
.objectid
= start
;
728 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
729 ret
= btrfs_search_slot(NULL
, root
->fs_info
->extent_root
, &key
, path
,
731 btrfs_free_path(path
);
736 * helper function to lookup reference count and flags of a tree block.
738 * the head node for delayed ref is used to store the sum of all the
739 * reference count modifications queued up in the rbtree. the head
740 * node may also store the extent flags to set. This way you can check
741 * to see what the reference count and extent flags would be if all of
742 * the delayed refs are not processed.
744 int btrfs_lookup_extent_info(struct btrfs_trans_handle
*trans
,
745 struct btrfs_root
*root
, u64 bytenr
,
746 u64 offset
, int metadata
, u64
*refs
, u64
*flags
)
748 struct btrfs_delayed_ref_head
*head
;
749 struct btrfs_delayed_ref_root
*delayed_refs
;
750 struct btrfs_path
*path
;
751 struct btrfs_extent_item
*ei
;
752 struct extent_buffer
*leaf
;
753 struct btrfs_key key
;
760 * If we don't have skinny metadata, don't bother doing anything
763 if (metadata
&& !btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
)) {
764 offset
= root
->nodesize
;
768 path
= btrfs_alloc_path();
773 path
->skip_locking
= 1;
774 path
->search_commit_root
= 1;
778 key
.objectid
= bytenr
;
781 key
.type
= BTRFS_METADATA_ITEM_KEY
;
783 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
785 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
,
790 if (ret
> 0 && metadata
&& key
.type
== BTRFS_METADATA_ITEM_KEY
) {
791 if (path
->slots
[0]) {
793 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
795 if (key
.objectid
== bytenr
&&
796 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
797 key
.offset
== root
->nodesize
)
803 leaf
= path
->nodes
[0];
804 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
805 if (item_size
>= sizeof(*ei
)) {
806 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
807 struct btrfs_extent_item
);
808 num_refs
= btrfs_extent_refs(leaf
, ei
);
809 extent_flags
= btrfs_extent_flags(leaf
, ei
);
811 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
812 struct btrfs_extent_item_v0
*ei0
;
813 BUG_ON(item_size
!= sizeof(*ei0
));
814 ei0
= btrfs_item_ptr(leaf
, path
->slots
[0],
815 struct btrfs_extent_item_v0
);
816 num_refs
= btrfs_extent_refs_v0(leaf
, ei0
);
817 /* FIXME: this isn't correct for data */
818 extent_flags
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
823 BUG_ON(num_refs
== 0);
833 delayed_refs
= &trans
->transaction
->delayed_refs
;
834 spin_lock(&delayed_refs
->lock
);
835 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
837 if (!mutex_trylock(&head
->mutex
)) {
838 atomic_inc(&head
->node
.refs
);
839 spin_unlock(&delayed_refs
->lock
);
841 btrfs_release_path(path
);
844 * Mutex was contended, block until it's released and try
847 mutex_lock(&head
->mutex
);
848 mutex_unlock(&head
->mutex
);
849 btrfs_put_delayed_ref(&head
->node
);
852 spin_lock(&head
->lock
);
853 if (head
->extent_op
&& head
->extent_op
->update_flags
)
854 extent_flags
|= head
->extent_op
->flags_to_set
;
856 BUG_ON(num_refs
== 0);
858 num_refs
+= head
->node
.ref_mod
;
859 spin_unlock(&head
->lock
);
860 mutex_unlock(&head
->mutex
);
862 spin_unlock(&delayed_refs
->lock
);
864 WARN_ON(num_refs
== 0);
868 *flags
= extent_flags
;
870 btrfs_free_path(path
);
875 * Back reference rules. Back refs have three main goals:
877 * 1) differentiate between all holders of references to an extent so that
878 * when a reference is dropped we can make sure it was a valid reference
879 * before freeing the extent.
881 * 2) Provide enough information to quickly find the holders of an extent
882 * if we notice a given block is corrupted or bad.
884 * 3) Make it easy to migrate blocks for FS shrinking or storage pool
885 * maintenance. This is actually the same as #2, but with a slightly
886 * different use case.
888 * There are two kinds of back refs. The implicit back refs is optimized
889 * for pointers in non-shared tree blocks. For a given pointer in a block,
890 * back refs of this kind provide information about the block's owner tree
891 * and the pointer's key. These information allow us to find the block by
892 * b-tree searching. The full back refs is for pointers in tree blocks not
893 * referenced by their owner trees. The location of tree block is recorded
894 * in the back refs. Actually the full back refs is generic, and can be
895 * used in all cases the implicit back refs is used. The major shortcoming
896 * of the full back refs is its overhead. Every time a tree block gets
897 * COWed, we have to update back refs entry for all pointers in it.
899 * For a newly allocated tree block, we use implicit back refs for
900 * pointers in it. This means most tree related operations only involve
901 * implicit back refs. For a tree block created in old transaction, the
902 * only way to drop a reference to it is COW it. So we can detect the
903 * event that tree block loses its owner tree's reference and do the
904 * back refs conversion.
906 * When a tree block is COW'd through a tree, there are four cases:
908 * The reference count of the block is one and the tree is the block's
909 * owner tree. Nothing to do in this case.
911 * The reference count of the block is one and the tree is not the
912 * block's owner tree. In this case, full back refs is used for pointers
913 * in the block. Remove these full back refs, add implicit back refs for
914 * every pointers in the new block.
916 * The reference count of the block is greater than one and the tree is
917 * the block's owner tree. In this case, implicit back refs is used for
918 * pointers in the block. Add full back refs for every pointers in the
919 * block, increase lower level extents' reference counts. The original
920 * implicit back refs are entailed to the new block.
922 * The reference count of the block is greater than one and the tree is
923 * not the block's owner tree. Add implicit back refs for every pointer in
924 * the new block, increase lower level extents' reference count.
926 * Back Reference Key composing:
928 * The key objectid corresponds to the first byte in the extent,
929 * The key type is used to differentiate between types of back refs.
930 * There are different meanings of the key offset for different types
933 * File extents can be referenced by:
935 * - multiple snapshots, subvolumes, or different generations in one subvol
936 * - different files inside a single subvolume
937 * - different offsets inside a file (bookend extents in file.c)
939 * The extent ref structure for the implicit back refs has fields for:
941 * - Objectid of the subvolume root
942 * - objectid of the file holding the reference
943 * - original offset in the file
944 * - how many bookend extents
946 * The key offset for the implicit back refs is hash of the first
949 * The extent ref structure for the full back refs has field for:
951 * - number of pointers in the tree leaf
953 * The key offset for the implicit back refs is the first byte of
956 * When a file extent is allocated, The implicit back refs is used.
957 * the fields are filled in:
959 * (root_key.objectid, inode objectid, offset in file, 1)
961 * When a file extent is removed file truncation, we find the
962 * corresponding implicit back refs and check the following fields:
964 * (btrfs_header_owner(leaf), inode objectid, offset in file)
966 * Btree extents can be referenced by:
968 * - Different subvolumes
970 * Both the implicit back refs and the full back refs for tree blocks
971 * only consist of key. The key offset for the implicit back refs is
972 * objectid of block's owner tree. The key offset for the full back refs
973 * is the first byte of parent block.
975 * When implicit back refs is used, information about the lowest key and
976 * level of the tree block are required. These information are stored in
977 * tree block info structure.
980 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
981 static int convert_extent_item_v0(struct btrfs_trans_handle
*trans
,
982 struct btrfs_root
*root
,
983 struct btrfs_path
*path
,
984 u64 owner
, u32 extra_size
)
986 struct btrfs_extent_item
*item
;
987 struct btrfs_extent_item_v0
*ei0
;
988 struct btrfs_extent_ref_v0
*ref0
;
989 struct btrfs_tree_block_info
*bi
;
990 struct extent_buffer
*leaf
;
991 struct btrfs_key key
;
992 struct btrfs_key found_key
;
993 u32 new_size
= sizeof(*item
);
997 leaf
= path
->nodes
[0];
998 BUG_ON(btrfs_item_size_nr(leaf
, path
->slots
[0]) != sizeof(*ei0
));
1000 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1001 ei0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1002 struct btrfs_extent_item_v0
);
1003 refs
= btrfs_extent_refs_v0(leaf
, ei0
);
1005 if (owner
== (u64
)-1) {
1007 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
1008 ret
= btrfs_next_leaf(root
, path
);
1011 BUG_ON(ret
> 0); /* Corruption */
1012 leaf
= path
->nodes
[0];
1014 btrfs_item_key_to_cpu(leaf
, &found_key
,
1016 BUG_ON(key
.objectid
!= found_key
.objectid
);
1017 if (found_key
.type
!= BTRFS_EXTENT_REF_V0_KEY
) {
1021 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1022 struct btrfs_extent_ref_v0
);
1023 owner
= btrfs_ref_objectid_v0(leaf
, ref0
);
1027 btrfs_release_path(path
);
1029 if (owner
< BTRFS_FIRST_FREE_OBJECTID
)
1030 new_size
+= sizeof(*bi
);
1032 new_size
-= sizeof(*ei0
);
1033 ret
= btrfs_search_slot(trans
, root
, &key
, path
,
1034 new_size
+ extra_size
, 1);
1037 BUG_ON(ret
); /* Corruption */
1039 btrfs_extend_item(root
, path
, new_size
);
1041 leaf
= path
->nodes
[0];
1042 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1043 btrfs_set_extent_refs(leaf
, item
, refs
);
1044 /* FIXME: get real generation */
1045 btrfs_set_extent_generation(leaf
, item
, 0);
1046 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1047 btrfs_set_extent_flags(leaf
, item
,
1048 BTRFS_EXTENT_FLAG_TREE_BLOCK
|
1049 BTRFS_BLOCK_FLAG_FULL_BACKREF
);
1050 bi
= (struct btrfs_tree_block_info
*)(item
+ 1);
1051 /* FIXME: get first key of the block */
1052 memset_extent_buffer(leaf
, 0, (unsigned long)bi
, sizeof(*bi
));
1053 btrfs_set_tree_block_level(leaf
, bi
, (int)owner
);
1055 btrfs_set_extent_flags(leaf
, item
, BTRFS_EXTENT_FLAG_DATA
);
1057 btrfs_mark_buffer_dirty(leaf
);
1062 static u64
hash_extent_data_ref(u64 root_objectid
, u64 owner
, u64 offset
)
1064 u32 high_crc
= ~(u32
)0;
1065 u32 low_crc
= ~(u32
)0;
1068 lenum
= cpu_to_le64(root_objectid
);
1069 high_crc
= btrfs_crc32c(high_crc
, &lenum
, sizeof(lenum
));
1070 lenum
= cpu_to_le64(owner
);
1071 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
1072 lenum
= cpu_to_le64(offset
);
1073 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
1075 return ((u64
)high_crc
<< 31) ^ (u64
)low_crc
;
1078 static u64
hash_extent_data_ref_item(struct extent_buffer
*leaf
,
1079 struct btrfs_extent_data_ref
*ref
)
1081 return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf
, ref
),
1082 btrfs_extent_data_ref_objectid(leaf
, ref
),
1083 btrfs_extent_data_ref_offset(leaf
, ref
));
1086 static int match_extent_data_ref(struct extent_buffer
*leaf
,
1087 struct btrfs_extent_data_ref
*ref
,
1088 u64 root_objectid
, u64 owner
, u64 offset
)
1090 if (btrfs_extent_data_ref_root(leaf
, ref
) != root_objectid
||
1091 btrfs_extent_data_ref_objectid(leaf
, ref
) != owner
||
1092 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
1097 static noinline
int lookup_extent_data_ref(struct btrfs_trans_handle
*trans
,
1098 struct btrfs_root
*root
,
1099 struct btrfs_path
*path
,
1100 u64 bytenr
, u64 parent
,
1102 u64 owner
, u64 offset
)
1104 struct btrfs_key key
;
1105 struct btrfs_extent_data_ref
*ref
;
1106 struct extent_buffer
*leaf
;
1112 key
.objectid
= bytenr
;
1114 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1115 key
.offset
= parent
;
1117 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1118 key
.offset
= hash_extent_data_ref(root_objectid
,
1123 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1132 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1133 key
.type
= BTRFS_EXTENT_REF_V0_KEY
;
1134 btrfs_release_path(path
);
1135 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1146 leaf
= path
->nodes
[0];
1147 nritems
= btrfs_header_nritems(leaf
);
1149 if (path
->slots
[0] >= nritems
) {
1150 ret
= btrfs_next_leaf(root
, path
);
1156 leaf
= path
->nodes
[0];
1157 nritems
= btrfs_header_nritems(leaf
);
1161 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1162 if (key
.objectid
!= bytenr
||
1163 key
.type
!= BTRFS_EXTENT_DATA_REF_KEY
)
1166 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1167 struct btrfs_extent_data_ref
);
1169 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1172 btrfs_release_path(path
);
1184 static noinline
int insert_extent_data_ref(struct btrfs_trans_handle
*trans
,
1185 struct btrfs_root
*root
,
1186 struct btrfs_path
*path
,
1187 u64 bytenr
, u64 parent
,
1188 u64 root_objectid
, u64 owner
,
1189 u64 offset
, int refs_to_add
)
1191 struct btrfs_key key
;
1192 struct extent_buffer
*leaf
;
1197 key
.objectid
= bytenr
;
1199 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1200 key
.offset
= parent
;
1201 size
= sizeof(struct btrfs_shared_data_ref
);
1203 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1204 key
.offset
= hash_extent_data_ref(root_objectid
,
1206 size
= sizeof(struct btrfs_extent_data_ref
);
1209 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, size
);
1210 if (ret
&& ret
!= -EEXIST
)
1213 leaf
= path
->nodes
[0];
1215 struct btrfs_shared_data_ref
*ref
;
1216 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1217 struct btrfs_shared_data_ref
);
1219 btrfs_set_shared_data_ref_count(leaf
, ref
, refs_to_add
);
1221 num_refs
= btrfs_shared_data_ref_count(leaf
, ref
);
1222 num_refs
+= refs_to_add
;
1223 btrfs_set_shared_data_ref_count(leaf
, ref
, num_refs
);
1226 struct btrfs_extent_data_ref
*ref
;
1227 while (ret
== -EEXIST
) {
1228 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1229 struct btrfs_extent_data_ref
);
1230 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1233 btrfs_release_path(path
);
1235 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
1237 if (ret
&& ret
!= -EEXIST
)
1240 leaf
= path
->nodes
[0];
1242 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1243 struct btrfs_extent_data_ref
);
1245 btrfs_set_extent_data_ref_root(leaf
, ref
,
1247 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
1248 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
1249 btrfs_set_extent_data_ref_count(leaf
, ref
, refs_to_add
);
1251 num_refs
= btrfs_extent_data_ref_count(leaf
, ref
);
1252 num_refs
+= refs_to_add
;
1253 btrfs_set_extent_data_ref_count(leaf
, ref
, num_refs
);
1256 btrfs_mark_buffer_dirty(leaf
);
1259 btrfs_release_path(path
);
1263 static noinline
int remove_extent_data_ref(struct btrfs_trans_handle
*trans
,
1264 struct btrfs_root
*root
,
1265 struct btrfs_path
*path
,
1266 int refs_to_drop
, int *last_ref
)
1268 struct btrfs_key key
;
1269 struct btrfs_extent_data_ref
*ref1
= NULL
;
1270 struct btrfs_shared_data_ref
*ref2
= NULL
;
1271 struct extent_buffer
*leaf
;
1275 leaf
= path
->nodes
[0];
1276 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1278 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1279 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1280 struct btrfs_extent_data_ref
);
1281 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1282 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1283 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1284 struct btrfs_shared_data_ref
);
1285 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1286 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1287 } else if (key
.type
== BTRFS_EXTENT_REF_V0_KEY
) {
1288 struct btrfs_extent_ref_v0
*ref0
;
1289 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1290 struct btrfs_extent_ref_v0
);
1291 num_refs
= btrfs_ref_count_v0(leaf
, ref0
);
1297 BUG_ON(num_refs
< refs_to_drop
);
1298 num_refs
-= refs_to_drop
;
1300 if (num_refs
== 0) {
1301 ret
= btrfs_del_item(trans
, root
, path
);
1304 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
)
1305 btrfs_set_extent_data_ref_count(leaf
, ref1
, num_refs
);
1306 else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
)
1307 btrfs_set_shared_data_ref_count(leaf
, ref2
, num_refs
);
1308 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1310 struct btrfs_extent_ref_v0
*ref0
;
1311 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1312 struct btrfs_extent_ref_v0
);
1313 btrfs_set_ref_count_v0(leaf
, ref0
, num_refs
);
1316 btrfs_mark_buffer_dirty(leaf
);
1321 static noinline u32
extent_data_ref_count(struct btrfs_root
*root
,
1322 struct btrfs_path
*path
,
1323 struct btrfs_extent_inline_ref
*iref
)
1325 struct btrfs_key key
;
1326 struct extent_buffer
*leaf
;
1327 struct btrfs_extent_data_ref
*ref1
;
1328 struct btrfs_shared_data_ref
*ref2
;
1331 leaf
= path
->nodes
[0];
1332 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1334 if (btrfs_extent_inline_ref_type(leaf
, iref
) ==
1335 BTRFS_EXTENT_DATA_REF_KEY
) {
1336 ref1
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1337 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1339 ref2
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1340 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1342 } else if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1343 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1344 struct btrfs_extent_data_ref
);
1345 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1346 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1347 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1348 struct btrfs_shared_data_ref
);
1349 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1350 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1351 } else if (key
.type
== BTRFS_EXTENT_REF_V0_KEY
) {
1352 struct btrfs_extent_ref_v0
*ref0
;
1353 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1354 struct btrfs_extent_ref_v0
);
1355 num_refs
= btrfs_ref_count_v0(leaf
, ref0
);
1363 static noinline
int lookup_tree_block_ref(struct btrfs_trans_handle
*trans
,
1364 struct btrfs_root
*root
,
1365 struct btrfs_path
*path
,
1366 u64 bytenr
, u64 parent
,
1369 struct btrfs_key key
;
1372 key
.objectid
= bytenr
;
1374 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1375 key
.offset
= parent
;
1377 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1378 key
.offset
= root_objectid
;
1381 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1384 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1385 if (ret
== -ENOENT
&& parent
) {
1386 btrfs_release_path(path
);
1387 key
.type
= BTRFS_EXTENT_REF_V0_KEY
;
1388 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1396 static noinline
int insert_tree_block_ref(struct btrfs_trans_handle
*trans
,
1397 struct btrfs_root
*root
,
1398 struct btrfs_path
*path
,
1399 u64 bytenr
, u64 parent
,
1402 struct btrfs_key key
;
1405 key
.objectid
= bytenr
;
1407 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1408 key
.offset
= parent
;
1410 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1411 key
.offset
= root_objectid
;
1414 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, 0);
1415 btrfs_release_path(path
);
1419 static inline int extent_ref_type(u64 parent
, u64 owner
)
1422 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1424 type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1426 type
= BTRFS_TREE_BLOCK_REF_KEY
;
1429 type
= BTRFS_SHARED_DATA_REF_KEY
;
1431 type
= BTRFS_EXTENT_DATA_REF_KEY
;
1436 static int find_next_key(struct btrfs_path
*path
, int level
,
1437 struct btrfs_key
*key
)
1440 for (; level
< BTRFS_MAX_LEVEL
; level
++) {
1441 if (!path
->nodes
[level
])
1443 if (path
->slots
[level
] + 1 >=
1444 btrfs_header_nritems(path
->nodes
[level
]))
1447 btrfs_item_key_to_cpu(path
->nodes
[level
], key
,
1448 path
->slots
[level
] + 1);
1450 btrfs_node_key_to_cpu(path
->nodes
[level
], key
,
1451 path
->slots
[level
] + 1);
1458 * look for inline back ref. if back ref is found, *ref_ret is set
1459 * to the address of inline back ref, and 0 is returned.
1461 * if back ref isn't found, *ref_ret is set to the address where it
1462 * should be inserted, and -ENOENT is returned.
1464 * if insert is true and there are too many inline back refs, the path
1465 * points to the extent item, and -EAGAIN is returned.
1467 * NOTE: inline back refs are ordered in the same way that back ref
1468 * items in the tree are ordered.
1470 static noinline_for_stack
1471 int lookup_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1472 struct btrfs_root
*root
,
1473 struct btrfs_path
*path
,
1474 struct btrfs_extent_inline_ref
**ref_ret
,
1475 u64 bytenr
, u64 num_bytes
,
1476 u64 parent
, u64 root_objectid
,
1477 u64 owner
, u64 offset
, int insert
)
1479 struct btrfs_key key
;
1480 struct extent_buffer
*leaf
;
1481 struct btrfs_extent_item
*ei
;
1482 struct btrfs_extent_inline_ref
*iref
;
1492 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
1495 key
.objectid
= bytenr
;
1496 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1497 key
.offset
= num_bytes
;
1499 want
= extent_ref_type(parent
, owner
);
1501 extra_size
= btrfs_extent_inline_ref_size(want
);
1502 path
->keep_locks
= 1;
1507 * Owner is our parent level, so we can just add one to get the level
1508 * for the block we are interested in.
1510 if (skinny_metadata
&& owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1511 key
.type
= BTRFS_METADATA_ITEM_KEY
;
1516 ret
= btrfs_search_slot(trans
, root
, &key
, path
, extra_size
, 1);
1523 * We may be a newly converted file system which still has the old fat
1524 * extent entries for metadata, so try and see if we have one of those.
1526 if (ret
> 0 && skinny_metadata
) {
1527 skinny_metadata
= false;
1528 if (path
->slots
[0]) {
1530 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
1532 if (key
.objectid
== bytenr
&&
1533 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
1534 key
.offset
== num_bytes
)
1538 key
.objectid
= bytenr
;
1539 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1540 key
.offset
= num_bytes
;
1541 btrfs_release_path(path
);
1546 if (ret
&& !insert
) {
1549 } else if (WARN_ON(ret
)) {
1554 leaf
= path
->nodes
[0];
1555 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1556 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1557 if (item_size
< sizeof(*ei
)) {
1562 ret
= convert_extent_item_v0(trans
, root
, path
, owner
,
1568 leaf
= path
->nodes
[0];
1569 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1572 BUG_ON(item_size
< sizeof(*ei
));
1574 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1575 flags
= btrfs_extent_flags(leaf
, ei
);
1577 ptr
= (unsigned long)(ei
+ 1);
1578 end
= (unsigned long)ei
+ item_size
;
1580 if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
&& !skinny_metadata
) {
1581 ptr
+= sizeof(struct btrfs_tree_block_info
);
1591 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1592 type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1596 ptr
+= btrfs_extent_inline_ref_size(type
);
1600 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1601 struct btrfs_extent_data_ref
*dref
;
1602 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1603 if (match_extent_data_ref(leaf
, dref
, root_objectid
,
1608 if (hash_extent_data_ref_item(leaf
, dref
) <
1609 hash_extent_data_ref(root_objectid
, owner
, offset
))
1613 ref_offset
= btrfs_extent_inline_ref_offset(leaf
, iref
);
1615 if (parent
== ref_offset
) {
1619 if (ref_offset
< parent
)
1622 if (root_objectid
== ref_offset
) {
1626 if (ref_offset
< root_objectid
)
1630 ptr
+= btrfs_extent_inline_ref_size(type
);
1632 if (err
== -ENOENT
&& insert
) {
1633 if (item_size
+ extra_size
>=
1634 BTRFS_MAX_EXTENT_ITEM_SIZE(root
)) {
1639 * To add new inline back ref, we have to make sure
1640 * there is no corresponding back ref item.
1641 * For simplicity, we just do not add new inline back
1642 * ref if there is any kind of item for this block
1644 if (find_next_key(path
, 0, &key
) == 0 &&
1645 key
.objectid
== bytenr
&&
1646 key
.type
< BTRFS_BLOCK_GROUP_ITEM_KEY
) {
1651 *ref_ret
= (struct btrfs_extent_inline_ref
*)ptr
;
1654 path
->keep_locks
= 0;
1655 btrfs_unlock_up_safe(path
, 1);
1661 * helper to add new inline back ref
1663 static noinline_for_stack
1664 void setup_inline_extent_backref(struct btrfs_root
*root
,
1665 struct btrfs_path
*path
,
1666 struct btrfs_extent_inline_ref
*iref
,
1667 u64 parent
, u64 root_objectid
,
1668 u64 owner
, u64 offset
, int refs_to_add
,
1669 struct btrfs_delayed_extent_op
*extent_op
)
1671 struct extent_buffer
*leaf
;
1672 struct btrfs_extent_item
*ei
;
1675 unsigned long item_offset
;
1680 leaf
= path
->nodes
[0];
1681 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1682 item_offset
= (unsigned long)iref
- (unsigned long)ei
;
1684 type
= extent_ref_type(parent
, owner
);
1685 size
= btrfs_extent_inline_ref_size(type
);
1687 btrfs_extend_item(root
, path
, size
);
1689 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1690 refs
= btrfs_extent_refs(leaf
, ei
);
1691 refs
+= refs_to_add
;
1692 btrfs_set_extent_refs(leaf
, ei
, refs
);
1694 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1696 ptr
= (unsigned long)ei
+ item_offset
;
1697 end
= (unsigned long)ei
+ btrfs_item_size_nr(leaf
, path
->slots
[0]);
1698 if (ptr
< end
- size
)
1699 memmove_extent_buffer(leaf
, ptr
+ size
, ptr
,
1702 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1703 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
1704 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1705 struct btrfs_extent_data_ref
*dref
;
1706 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1707 btrfs_set_extent_data_ref_root(leaf
, dref
, root_objectid
);
1708 btrfs_set_extent_data_ref_objectid(leaf
, dref
, owner
);
1709 btrfs_set_extent_data_ref_offset(leaf
, dref
, offset
);
1710 btrfs_set_extent_data_ref_count(leaf
, dref
, refs_to_add
);
1711 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1712 struct btrfs_shared_data_ref
*sref
;
1713 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1714 btrfs_set_shared_data_ref_count(leaf
, sref
, refs_to_add
);
1715 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1716 } else if (type
== BTRFS_SHARED_BLOCK_REF_KEY
) {
1717 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1719 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
1721 btrfs_mark_buffer_dirty(leaf
);
1724 static int lookup_extent_backref(struct btrfs_trans_handle
*trans
,
1725 struct btrfs_root
*root
,
1726 struct btrfs_path
*path
,
1727 struct btrfs_extent_inline_ref
**ref_ret
,
1728 u64 bytenr
, u64 num_bytes
, u64 parent
,
1729 u64 root_objectid
, u64 owner
, u64 offset
)
1733 ret
= lookup_inline_extent_backref(trans
, root
, path
, ref_ret
,
1734 bytenr
, num_bytes
, parent
,
1735 root_objectid
, owner
, offset
, 0);
1739 btrfs_release_path(path
);
1742 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1743 ret
= lookup_tree_block_ref(trans
, root
, path
, bytenr
, parent
,
1746 ret
= lookup_extent_data_ref(trans
, root
, path
, bytenr
, parent
,
1747 root_objectid
, owner
, offset
);
1753 * helper to update/remove inline back ref
1755 static noinline_for_stack
1756 void update_inline_extent_backref(struct btrfs_root
*root
,
1757 struct btrfs_path
*path
,
1758 struct btrfs_extent_inline_ref
*iref
,
1760 struct btrfs_delayed_extent_op
*extent_op
,
1763 struct extent_buffer
*leaf
;
1764 struct btrfs_extent_item
*ei
;
1765 struct btrfs_extent_data_ref
*dref
= NULL
;
1766 struct btrfs_shared_data_ref
*sref
= NULL
;
1774 leaf
= path
->nodes
[0];
1775 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1776 refs
= btrfs_extent_refs(leaf
, ei
);
1777 WARN_ON(refs_to_mod
< 0 && refs
+ refs_to_mod
<= 0);
1778 refs
+= refs_to_mod
;
1779 btrfs_set_extent_refs(leaf
, ei
, refs
);
1781 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1783 type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1785 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1786 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1787 refs
= btrfs_extent_data_ref_count(leaf
, dref
);
1788 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1789 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1790 refs
= btrfs_shared_data_ref_count(leaf
, sref
);
1793 BUG_ON(refs_to_mod
!= -1);
1796 BUG_ON(refs_to_mod
< 0 && refs
< -refs_to_mod
);
1797 refs
+= refs_to_mod
;
1800 if (type
== BTRFS_EXTENT_DATA_REF_KEY
)
1801 btrfs_set_extent_data_ref_count(leaf
, dref
, refs
);
1803 btrfs_set_shared_data_ref_count(leaf
, sref
, refs
);
1806 size
= btrfs_extent_inline_ref_size(type
);
1807 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1808 ptr
= (unsigned long)iref
;
1809 end
= (unsigned long)ei
+ item_size
;
1810 if (ptr
+ size
< end
)
1811 memmove_extent_buffer(leaf
, ptr
, ptr
+ size
,
1814 btrfs_truncate_item(root
, path
, item_size
, 1);
1816 btrfs_mark_buffer_dirty(leaf
);
1819 static noinline_for_stack
1820 int insert_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1821 struct btrfs_root
*root
,
1822 struct btrfs_path
*path
,
1823 u64 bytenr
, u64 num_bytes
, u64 parent
,
1824 u64 root_objectid
, u64 owner
,
1825 u64 offset
, int refs_to_add
,
1826 struct btrfs_delayed_extent_op
*extent_op
)
1828 struct btrfs_extent_inline_ref
*iref
;
1831 ret
= lookup_inline_extent_backref(trans
, root
, path
, &iref
,
1832 bytenr
, num_bytes
, parent
,
1833 root_objectid
, owner
, offset
, 1);
1835 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
);
1836 update_inline_extent_backref(root
, path
, iref
,
1837 refs_to_add
, extent_op
, NULL
);
1838 } else if (ret
== -ENOENT
) {
1839 setup_inline_extent_backref(root
, path
, iref
, parent
,
1840 root_objectid
, owner
, offset
,
1841 refs_to_add
, extent_op
);
1847 static int insert_extent_backref(struct btrfs_trans_handle
*trans
,
1848 struct btrfs_root
*root
,
1849 struct btrfs_path
*path
,
1850 u64 bytenr
, u64 parent
, u64 root_objectid
,
1851 u64 owner
, u64 offset
, int refs_to_add
)
1854 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1855 BUG_ON(refs_to_add
!= 1);
1856 ret
= insert_tree_block_ref(trans
, root
, path
, bytenr
,
1857 parent
, root_objectid
);
1859 ret
= insert_extent_data_ref(trans
, root
, path
, bytenr
,
1860 parent
, root_objectid
,
1861 owner
, offset
, refs_to_add
);
1866 static int remove_extent_backref(struct btrfs_trans_handle
*trans
,
1867 struct btrfs_root
*root
,
1868 struct btrfs_path
*path
,
1869 struct btrfs_extent_inline_ref
*iref
,
1870 int refs_to_drop
, int is_data
, int *last_ref
)
1874 BUG_ON(!is_data
&& refs_to_drop
!= 1);
1876 update_inline_extent_backref(root
, path
, iref
,
1877 -refs_to_drop
, NULL
, last_ref
);
1878 } else if (is_data
) {
1879 ret
= remove_extent_data_ref(trans
, root
, path
, refs_to_drop
,
1883 ret
= btrfs_del_item(trans
, root
, path
);
1888 static int btrfs_issue_discard(struct block_device
*bdev
,
1891 return blkdev_issue_discard(bdev
, start
>> 9, len
>> 9, GFP_NOFS
, 0);
1894 static int btrfs_discard_extent(struct btrfs_root
*root
, u64 bytenr
,
1895 u64 num_bytes
, u64
*actual_bytes
)
1898 u64 discarded_bytes
= 0;
1899 struct btrfs_bio
*bbio
= NULL
;
1902 /* Tell the block device(s) that the sectors can be discarded */
1903 ret
= btrfs_map_block(root
->fs_info
, REQ_DISCARD
,
1904 bytenr
, &num_bytes
, &bbio
, 0);
1905 /* Error condition is -ENOMEM */
1907 struct btrfs_bio_stripe
*stripe
= bbio
->stripes
;
1911 for (i
= 0; i
< bbio
->num_stripes
; i
++, stripe
++) {
1912 if (!stripe
->dev
->can_discard
)
1915 ret
= btrfs_issue_discard(stripe
->dev
->bdev
,
1919 discarded_bytes
+= stripe
->length
;
1920 else if (ret
!= -EOPNOTSUPP
)
1921 break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */
1924 * Just in case we get back EOPNOTSUPP for some reason,
1925 * just ignore the return value so we don't screw up
1926 * people calling discard_extent.
1934 *actual_bytes
= discarded_bytes
;
1937 if (ret
== -EOPNOTSUPP
)
1942 /* Can return -ENOMEM */
1943 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1944 struct btrfs_root
*root
,
1945 u64 bytenr
, u64 num_bytes
, u64 parent
,
1946 u64 root_objectid
, u64 owner
, u64 offset
,
1950 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1952 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
&&
1953 root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
1955 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1956 ret
= btrfs_add_delayed_tree_ref(fs_info
, trans
, bytenr
,
1958 parent
, root_objectid
, (int)owner
,
1959 BTRFS_ADD_DELAYED_REF
, NULL
, no_quota
);
1961 ret
= btrfs_add_delayed_data_ref(fs_info
, trans
, bytenr
,
1963 parent
, root_objectid
, owner
, offset
,
1964 BTRFS_ADD_DELAYED_REF
, NULL
, no_quota
);
1969 static int __btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1970 struct btrfs_root
*root
,
1971 u64 bytenr
, u64 num_bytes
,
1972 u64 parent
, u64 root_objectid
,
1973 u64 owner
, u64 offset
, int refs_to_add
,
1975 struct btrfs_delayed_extent_op
*extent_op
)
1977 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1978 struct btrfs_path
*path
;
1979 struct extent_buffer
*leaf
;
1980 struct btrfs_extent_item
*item
;
1981 struct btrfs_key key
;
1984 enum btrfs_qgroup_operation_type type
= BTRFS_QGROUP_OPER_ADD_EXCL
;
1986 path
= btrfs_alloc_path();
1990 if (!is_fstree(root_objectid
) || !root
->fs_info
->quota_enabled
)
1994 path
->leave_spinning
= 1;
1995 /* this will setup the path even if it fails to insert the back ref */
1996 ret
= insert_inline_extent_backref(trans
, fs_info
->extent_root
, path
,
1997 bytenr
, num_bytes
, parent
,
1998 root_objectid
, owner
, offset
,
1999 refs_to_add
, extent_op
);
2000 if ((ret
< 0 && ret
!= -EAGAIN
) || (!ret
&& no_quota
))
2003 * Ok we were able to insert an inline extent and it appears to be a new
2004 * reference, deal with the qgroup accounting.
2006 if (!ret
&& !no_quota
) {
2007 ASSERT(root
->fs_info
->quota_enabled
);
2008 leaf
= path
->nodes
[0];
2009 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2010 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2011 struct btrfs_extent_item
);
2012 if (btrfs_extent_refs(leaf
, item
) > (u64
)refs_to_add
)
2013 type
= BTRFS_QGROUP_OPER_ADD_SHARED
;
2014 btrfs_release_path(path
);
2016 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
2017 bytenr
, num_bytes
, type
, 0);
2022 * Ok we had -EAGAIN which means we didn't have space to insert and
2023 * inline extent ref, so just update the reference count and add a
2026 leaf
= path
->nodes
[0];
2027 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2028 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2029 refs
= btrfs_extent_refs(leaf
, item
);
2031 type
= BTRFS_QGROUP_OPER_ADD_SHARED
;
2032 btrfs_set_extent_refs(leaf
, item
, refs
+ refs_to_add
);
2034 __run_delayed_extent_op(extent_op
, leaf
, item
);
2036 btrfs_mark_buffer_dirty(leaf
);
2037 btrfs_release_path(path
);
2040 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
2041 bytenr
, num_bytes
, type
, 0);
2047 path
->leave_spinning
= 1;
2048 /* now insert the actual backref */
2049 ret
= insert_extent_backref(trans
, root
->fs_info
->extent_root
,
2050 path
, bytenr
, parent
, root_objectid
,
2051 owner
, offset
, refs_to_add
);
2053 btrfs_abort_transaction(trans
, root
, ret
);
2055 btrfs_free_path(path
);
2059 static int run_delayed_data_ref(struct btrfs_trans_handle
*trans
,
2060 struct btrfs_root
*root
,
2061 struct btrfs_delayed_ref_node
*node
,
2062 struct btrfs_delayed_extent_op
*extent_op
,
2063 int insert_reserved
)
2066 struct btrfs_delayed_data_ref
*ref
;
2067 struct btrfs_key ins
;
2072 ins
.objectid
= node
->bytenr
;
2073 ins
.offset
= node
->num_bytes
;
2074 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2076 ref
= btrfs_delayed_node_to_data_ref(node
);
2077 trace_run_delayed_data_ref(node
, ref
, node
->action
);
2079 if (node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2080 parent
= ref
->parent
;
2081 ref_root
= ref
->root
;
2083 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2085 flags
|= extent_op
->flags_to_set
;
2086 ret
= alloc_reserved_file_extent(trans
, root
,
2087 parent
, ref_root
, flags
,
2088 ref
->objectid
, ref
->offset
,
2089 &ins
, node
->ref_mod
);
2090 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2091 ret
= __btrfs_inc_extent_ref(trans
, root
, node
->bytenr
,
2092 node
->num_bytes
, parent
,
2093 ref_root
, ref
->objectid
,
2094 ref
->offset
, node
->ref_mod
,
2095 node
->no_quota
, extent_op
);
2096 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2097 ret
= __btrfs_free_extent(trans
, root
, node
->bytenr
,
2098 node
->num_bytes
, parent
,
2099 ref_root
, ref
->objectid
,
2100 ref
->offset
, node
->ref_mod
,
2101 extent_op
, node
->no_quota
);
2108 static void __run_delayed_extent_op(struct btrfs_delayed_extent_op
*extent_op
,
2109 struct extent_buffer
*leaf
,
2110 struct btrfs_extent_item
*ei
)
2112 u64 flags
= btrfs_extent_flags(leaf
, ei
);
2113 if (extent_op
->update_flags
) {
2114 flags
|= extent_op
->flags_to_set
;
2115 btrfs_set_extent_flags(leaf
, ei
, flags
);
2118 if (extent_op
->update_key
) {
2119 struct btrfs_tree_block_info
*bi
;
2120 BUG_ON(!(flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
));
2121 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
2122 btrfs_set_tree_block_key(leaf
, bi
, &extent_op
->key
);
2126 static int run_delayed_extent_op(struct btrfs_trans_handle
*trans
,
2127 struct btrfs_root
*root
,
2128 struct btrfs_delayed_ref_node
*node
,
2129 struct btrfs_delayed_extent_op
*extent_op
)
2131 struct btrfs_key key
;
2132 struct btrfs_path
*path
;
2133 struct btrfs_extent_item
*ei
;
2134 struct extent_buffer
*leaf
;
2138 int metadata
= !extent_op
->is_data
;
2143 if (metadata
&& !btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
))
2146 path
= btrfs_alloc_path();
2150 key
.objectid
= node
->bytenr
;
2153 key
.type
= BTRFS_METADATA_ITEM_KEY
;
2154 key
.offset
= extent_op
->level
;
2156 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2157 key
.offset
= node
->num_bytes
;
2162 path
->leave_spinning
= 1;
2163 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
, &key
,
2171 if (path
->slots
[0] > 0) {
2173 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
2175 if (key
.objectid
== node
->bytenr
&&
2176 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
2177 key
.offset
== node
->num_bytes
)
2181 btrfs_release_path(path
);
2184 key
.objectid
= node
->bytenr
;
2185 key
.offset
= node
->num_bytes
;
2186 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2195 leaf
= path
->nodes
[0];
2196 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2197 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
2198 if (item_size
< sizeof(*ei
)) {
2199 ret
= convert_extent_item_v0(trans
, root
->fs_info
->extent_root
,
2205 leaf
= path
->nodes
[0];
2206 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2209 BUG_ON(item_size
< sizeof(*ei
));
2210 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2211 __run_delayed_extent_op(extent_op
, leaf
, ei
);
2213 btrfs_mark_buffer_dirty(leaf
);
2215 btrfs_free_path(path
);
2219 static int run_delayed_tree_ref(struct btrfs_trans_handle
*trans
,
2220 struct btrfs_root
*root
,
2221 struct btrfs_delayed_ref_node
*node
,
2222 struct btrfs_delayed_extent_op
*extent_op
,
2223 int insert_reserved
)
2226 struct btrfs_delayed_tree_ref
*ref
;
2227 struct btrfs_key ins
;
2230 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
2233 ref
= btrfs_delayed_node_to_tree_ref(node
);
2234 trace_run_delayed_tree_ref(node
, ref
, node
->action
);
2236 if (node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2237 parent
= ref
->parent
;
2238 ref_root
= ref
->root
;
2240 ins
.objectid
= node
->bytenr
;
2241 if (skinny_metadata
) {
2242 ins
.offset
= ref
->level
;
2243 ins
.type
= BTRFS_METADATA_ITEM_KEY
;
2245 ins
.offset
= node
->num_bytes
;
2246 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2249 BUG_ON(node
->ref_mod
!= 1);
2250 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2251 BUG_ON(!extent_op
|| !extent_op
->update_flags
);
2252 ret
= alloc_reserved_tree_block(trans
, root
,
2254 extent_op
->flags_to_set
,
2258 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2259 ret
= __btrfs_inc_extent_ref(trans
, root
, node
->bytenr
,
2260 node
->num_bytes
, parent
, ref_root
,
2261 ref
->level
, 0, 1, node
->no_quota
,
2263 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2264 ret
= __btrfs_free_extent(trans
, root
, node
->bytenr
,
2265 node
->num_bytes
, parent
, ref_root
,
2266 ref
->level
, 0, 1, extent_op
,
2274 /* helper function to actually process a single delayed ref entry */
2275 static int run_one_delayed_ref(struct btrfs_trans_handle
*trans
,
2276 struct btrfs_root
*root
,
2277 struct btrfs_delayed_ref_node
*node
,
2278 struct btrfs_delayed_extent_op
*extent_op
,
2279 int insert_reserved
)
2283 if (trans
->aborted
) {
2284 if (insert_reserved
)
2285 btrfs_pin_extent(root
, node
->bytenr
,
2286 node
->num_bytes
, 1);
2290 if (btrfs_delayed_ref_is_head(node
)) {
2291 struct btrfs_delayed_ref_head
*head
;
2293 * we've hit the end of the chain and we were supposed
2294 * to insert this extent into the tree. But, it got
2295 * deleted before we ever needed to insert it, so all
2296 * we have to do is clean up the accounting
2299 head
= btrfs_delayed_node_to_head(node
);
2300 trace_run_delayed_ref_head(node
, head
, node
->action
);
2302 if (insert_reserved
) {
2303 btrfs_pin_extent(root
, node
->bytenr
,
2304 node
->num_bytes
, 1);
2305 if (head
->is_data
) {
2306 ret
= btrfs_del_csums(trans
, root
,
2314 if (node
->type
== BTRFS_TREE_BLOCK_REF_KEY
||
2315 node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2316 ret
= run_delayed_tree_ref(trans
, root
, node
, extent_op
,
2318 else if (node
->type
== BTRFS_EXTENT_DATA_REF_KEY
||
2319 node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2320 ret
= run_delayed_data_ref(trans
, root
, node
, extent_op
,
2327 static noinline
struct btrfs_delayed_ref_node
*
2328 select_delayed_ref(struct btrfs_delayed_ref_head
*head
)
2330 struct rb_node
*node
;
2331 struct btrfs_delayed_ref_node
*ref
, *last
= NULL
;;
2334 * select delayed ref of type BTRFS_ADD_DELAYED_REF first.
2335 * this prevents ref count from going down to zero when
2336 * there still are pending delayed ref.
2338 node
= rb_first(&head
->ref_root
);
2340 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
,
2342 if (ref
->action
== BTRFS_ADD_DELAYED_REF
)
2344 else if (last
== NULL
)
2346 node
= rb_next(node
);
2352 * Returns 0 on success or if called with an already aborted transaction.
2353 * Returns -ENOMEM or -EIO on failure and will abort the transaction.
2355 static noinline
int __btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2356 struct btrfs_root
*root
,
2359 struct btrfs_delayed_ref_root
*delayed_refs
;
2360 struct btrfs_delayed_ref_node
*ref
;
2361 struct btrfs_delayed_ref_head
*locked_ref
= NULL
;
2362 struct btrfs_delayed_extent_op
*extent_op
;
2363 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2364 ktime_t start
= ktime_get();
2366 unsigned long count
= 0;
2367 unsigned long actual_count
= 0;
2368 int must_insert_reserved
= 0;
2370 delayed_refs
= &trans
->transaction
->delayed_refs
;
2376 spin_lock(&delayed_refs
->lock
);
2377 locked_ref
= btrfs_select_ref_head(trans
);
2379 spin_unlock(&delayed_refs
->lock
);
2383 /* grab the lock that says we are going to process
2384 * all the refs for this head */
2385 ret
= btrfs_delayed_ref_lock(trans
, locked_ref
);
2386 spin_unlock(&delayed_refs
->lock
);
2388 * we may have dropped the spin lock to get the head
2389 * mutex lock, and that might have given someone else
2390 * time to free the head. If that's true, it has been
2391 * removed from our list and we can move on.
2393 if (ret
== -EAGAIN
) {
2401 * We need to try and merge add/drops of the same ref since we
2402 * can run into issues with relocate dropping the implicit ref
2403 * and then it being added back again before the drop can
2404 * finish. If we merged anything we need to re-loop so we can
2407 spin_lock(&locked_ref
->lock
);
2408 btrfs_merge_delayed_refs(trans
, fs_info
, delayed_refs
,
2412 * locked_ref is the head node, so we have to go one
2413 * node back for any delayed ref updates
2415 ref
= select_delayed_ref(locked_ref
);
2417 if (ref
&& ref
->seq
&&
2418 btrfs_check_delayed_seq(fs_info
, delayed_refs
, ref
->seq
)) {
2419 spin_unlock(&locked_ref
->lock
);
2420 btrfs_delayed_ref_unlock(locked_ref
);
2421 spin_lock(&delayed_refs
->lock
);
2422 locked_ref
->processing
= 0;
2423 delayed_refs
->num_heads_ready
++;
2424 spin_unlock(&delayed_refs
->lock
);
2432 * record the must insert reserved flag before we
2433 * drop the spin lock.
2435 must_insert_reserved
= locked_ref
->must_insert_reserved
;
2436 locked_ref
->must_insert_reserved
= 0;
2438 extent_op
= locked_ref
->extent_op
;
2439 locked_ref
->extent_op
= NULL
;
2444 /* All delayed refs have been processed, Go ahead
2445 * and send the head node to run_one_delayed_ref,
2446 * so that any accounting fixes can happen
2448 ref
= &locked_ref
->node
;
2450 if (extent_op
&& must_insert_reserved
) {
2451 btrfs_free_delayed_extent_op(extent_op
);
2456 spin_unlock(&locked_ref
->lock
);
2457 ret
= run_delayed_extent_op(trans
, root
,
2459 btrfs_free_delayed_extent_op(extent_op
);
2463 * Need to reset must_insert_reserved if
2464 * there was an error so the abort stuff
2465 * can cleanup the reserved space
2468 if (must_insert_reserved
)
2469 locked_ref
->must_insert_reserved
= 1;
2470 locked_ref
->processing
= 0;
2471 btrfs_debug(fs_info
, "run_delayed_extent_op returned %d", ret
);
2472 btrfs_delayed_ref_unlock(locked_ref
);
2479 * Need to drop our head ref lock and re-aqcuire the
2480 * delayed ref lock and then re-check to make sure
2483 spin_unlock(&locked_ref
->lock
);
2484 spin_lock(&delayed_refs
->lock
);
2485 spin_lock(&locked_ref
->lock
);
2486 if (rb_first(&locked_ref
->ref_root
) ||
2487 locked_ref
->extent_op
) {
2488 spin_unlock(&locked_ref
->lock
);
2489 spin_unlock(&delayed_refs
->lock
);
2493 delayed_refs
->num_heads
--;
2494 rb_erase(&locked_ref
->href_node
,
2495 &delayed_refs
->href_root
);
2496 spin_unlock(&delayed_refs
->lock
);
2500 rb_erase(&ref
->rb_node
, &locked_ref
->ref_root
);
2502 atomic_dec(&delayed_refs
->num_entries
);
2504 if (!btrfs_delayed_ref_is_head(ref
)) {
2506 * when we play the delayed ref, also correct the
2509 switch (ref
->action
) {
2510 case BTRFS_ADD_DELAYED_REF
:
2511 case BTRFS_ADD_DELAYED_EXTENT
:
2512 locked_ref
->node
.ref_mod
-= ref
->ref_mod
;
2514 case BTRFS_DROP_DELAYED_REF
:
2515 locked_ref
->node
.ref_mod
+= ref
->ref_mod
;
2521 spin_unlock(&locked_ref
->lock
);
2523 ret
= run_one_delayed_ref(trans
, root
, ref
, extent_op
,
2524 must_insert_reserved
);
2526 btrfs_free_delayed_extent_op(extent_op
);
2528 locked_ref
->processing
= 0;
2529 btrfs_delayed_ref_unlock(locked_ref
);
2530 btrfs_put_delayed_ref(ref
);
2531 btrfs_debug(fs_info
, "run_one_delayed_ref returned %d", ret
);
2536 * If this node is a head, that means all the refs in this head
2537 * have been dealt with, and we will pick the next head to deal
2538 * with, so we must unlock the head and drop it from the cluster
2539 * list before we release it.
2541 if (btrfs_delayed_ref_is_head(ref
)) {
2542 btrfs_delayed_ref_unlock(locked_ref
);
2545 btrfs_put_delayed_ref(ref
);
2551 * We don't want to include ref heads since we can have empty ref heads
2552 * and those will drastically skew our runtime down since we just do
2553 * accounting, no actual extent tree updates.
2555 if (actual_count
> 0) {
2556 u64 runtime
= ktime_to_ns(ktime_sub(ktime_get(), start
));
2560 * We weigh the current average higher than our current runtime
2561 * to avoid large swings in the average.
2563 spin_lock(&delayed_refs
->lock
);
2564 avg
= fs_info
->avg_delayed_ref_runtime
* 3 + runtime
;
2565 avg
= div64_u64(avg
, 4);
2566 fs_info
->avg_delayed_ref_runtime
= avg
;
2567 spin_unlock(&delayed_refs
->lock
);
2572 #ifdef SCRAMBLE_DELAYED_REFS
2574 * Normally delayed refs get processed in ascending bytenr order. This
2575 * correlates in most cases to the order added. To expose dependencies on this
2576 * order, we start to process the tree in the middle instead of the beginning
2578 static u64
find_middle(struct rb_root
*root
)
2580 struct rb_node
*n
= root
->rb_node
;
2581 struct btrfs_delayed_ref_node
*entry
;
2584 u64 first
= 0, last
= 0;
2588 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2589 first
= entry
->bytenr
;
2593 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2594 last
= entry
->bytenr
;
2599 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2600 WARN_ON(!entry
->in_tree
);
2602 middle
= entry
->bytenr
;
2615 static inline u64
heads_to_leaves(struct btrfs_root
*root
, u64 heads
)
2619 num_bytes
= heads
* (sizeof(struct btrfs_extent_item
) +
2620 sizeof(struct btrfs_extent_inline_ref
));
2621 if (!btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
))
2622 num_bytes
+= heads
* sizeof(struct btrfs_tree_block_info
);
2625 * We don't ever fill up leaves all the way so multiply by 2 just to be
2626 * closer to what we're really going to want to ouse.
2628 return div64_u64(num_bytes
, BTRFS_LEAF_DATA_SIZE(root
));
2631 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle
*trans
,
2632 struct btrfs_root
*root
)
2634 struct btrfs_block_rsv
*global_rsv
;
2635 u64 num_heads
= trans
->transaction
->delayed_refs
.num_heads_ready
;
2639 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
2640 num_heads
= heads_to_leaves(root
, num_heads
);
2642 num_bytes
+= (num_heads
- 1) * root
->nodesize
;
2644 global_rsv
= &root
->fs_info
->global_block_rsv
;
2647 * If we can't allocate any more chunks lets make sure we have _lots_ of
2648 * wiggle room since running delayed refs can create more delayed refs.
2650 if (global_rsv
->space_info
->full
)
2653 spin_lock(&global_rsv
->lock
);
2654 if (global_rsv
->reserved
<= num_bytes
)
2656 spin_unlock(&global_rsv
->lock
);
2660 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle
*trans
,
2661 struct btrfs_root
*root
)
2663 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2665 atomic_read(&trans
->transaction
->delayed_refs
.num_entries
);
2670 avg_runtime
= fs_info
->avg_delayed_ref_runtime
;
2671 val
= num_entries
* avg_runtime
;
2672 if (num_entries
* avg_runtime
>= NSEC_PER_SEC
)
2674 if (val
>= NSEC_PER_SEC
/ 2)
2677 return btrfs_check_space_for_delayed_refs(trans
, root
);
2680 struct async_delayed_refs
{
2681 struct btrfs_root
*root
;
2685 struct completion wait
;
2686 struct btrfs_work work
;
2689 static void delayed_ref_async_start(struct btrfs_work
*work
)
2691 struct async_delayed_refs
*async
;
2692 struct btrfs_trans_handle
*trans
;
2695 async
= container_of(work
, struct async_delayed_refs
, work
);
2697 trans
= btrfs_join_transaction(async
->root
);
2698 if (IS_ERR(trans
)) {
2699 async
->error
= PTR_ERR(trans
);
2704 * trans->sync means that when we call end_transaciton, we won't
2705 * wait on delayed refs
2708 ret
= btrfs_run_delayed_refs(trans
, async
->root
, async
->count
);
2712 ret
= btrfs_end_transaction(trans
, async
->root
);
2713 if (ret
&& !async
->error
)
2717 complete(&async
->wait
);
2722 int btrfs_async_run_delayed_refs(struct btrfs_root
*root
,
2723 unsigned long count
, int wait
)
2725 struct async_delayed_refs
*async
;
2728 async
= kmalloc(sizeof(*async
), GFP_NOFS
);
2732 async
->root
= root
->fs_info
->tree_root
;
2733 async
->count
= count
;
2739 init_completion(&async
->wait
);
2741 btrfs_init_work(&async
->work
, btrfs_extent_refs_helper
,
2742 delayed_ref_async_start
, NULL
, NULL
);
2744 btrfs_queue_work(root
->fs_info
->extent_workers
, &async
->work
);
2747 wait_for_completion(&async
->wait
);
2756 * this starts processing the delayed reference count updates and
2757 * extent insertions we have queued up so far. count can be
2758 * 0, which means to process everything in the tree at the start
2759 * of the run (but not newly added entries), or it can be some target
2760 * number you'd like to process.
2762 * Returns 0 on success or if called with an aborted transaction
2763 * Returns <0 on error and aborts the transaction
2765 int btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2766 struct btrfs_root
*root
, unsigned long count
)
2768 struct rb_node
*node
;
2769 struct btrfs_delayed_ref_root
*delayed_refs
;
2770 struct btrfs_delayed_ref_head
*head
;
2772 int run_all
= count
== (unsigned long)-1;
2775 /* We'll clean this up in btrfs_cleanup_transaction */
2779 if (root
== root
->fs_info
->extent_root
)
2780 root
= root
->fs_info
->tree_root
;
2782 delayed_refs
= &trans
->transaction
->delayed_refs
;
2784 count
= atomic_read(&delayed_refs
->num_entries
) * 2;
2789 #ifdef SCRAMBLE_DELAYED_REFS
2790 delayed_refs
->run_delayed_start
= find_middle(&delayed_refs
->root
);
2792 ret
= __btrfs_run_delayed_refs(trans
, root
, count
);
2794 btrfs_abort_transaction(trans
, root
, ret
);
2799 if (!list_empty(&trans
->new_bgs
))
2800 btrfs_create_pending_block_groups(trans
, root
);
2802 spin_lock(&delayed_refs
->lock
);
2803 node
= rb_first(&delayed_refs
->href_root
);
2805 spin_unlock(&delayed_refs
->lock
);
2808 count
= (unsigned long)-1;
2811 head
= rb_entry(node
, struct btrfs_delayed_ref_head
,
2813 if (btrfs_delayed_ref_is_head(&head
->node
)) {
2814 struct btrfs_delayed_ref_node
*ref
;
2817 atomic_inc(&ref
->refs
);
2819 spin_unlock(&delayed_refs
->lock
);
2821 * Mutex was contended, block until it's
2822 * released and try again
2824 mutex_lock(&head
->mutex
);
2825 mutex_unlock(&head
->mutex
);
2827 btrfs_put_delayed_ref(ref
);
2833 node
= rb_next(node
);
2835 spin_unlock(&delayed_refs
->lock
);
2840 ret
= btrfs_delayed_qgroup_accounting(trans
, root
->fs_info
);
2843 assert_qgroups_uptodate(trans
);
2847 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle
*trans
,
2848 struct btrfs_root
*root
,
2849 u64 bytenr
, u64 num_bytes
, u64 flags
,
2850 int level
, int is_data
)
2852 struct btrfs_delayed_extent_op
*extent_op
;
2855 extent_op
= btrfs_alloc_delayed_extent_op();
2859 extent_op
->flags_to_set
= flags
;
2860 extent_op
->update_flags
= 1;
2861 extent_op
->update_key
= 0;
2862 extent_op
->is_data
= is_data
? 1 : 0;
2863 extent_op
->level
= level
;
2865 ret
= btrfs_add_delayed_extent_op(root
->fs_info
, trans
, bytenr
,
2866 num_bytes
, extent_op
);
2868 btrfs_free_delayed_extent_op(extent_op
);
2872 static noinline
int check_delayed_ref(struct btrfs_trans_handle
*trans
,
2873 struct btrfs_root
*root
,
2874 struct btrfs_path
*path
,
2875 u64 objectid
, u64 offset
, u64 bytenr
)
2877 struct btrfs_delayed_ref_head
*head
;
2878 struct btrfs_delayed_ref_node
*ref
;
2879 struct btrfs_delayed_data_ref
*data_ref
;
2880 struct btrfs_delayed_ref_root
*delayed_refs
;
2881 struct rb_node
*node
;
2884 delayed_refs
= &trans
->transaction
->delayed_refs
;
2885 spin_lock(&delayed_refs
->lock
);
2886 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
2888 spin_unlock(&delayed_refs
->lock
);
2892 if (!mutex_trylock(&head
->mutex
)) {
2893 atomic_inc(&head
->node
.refs
);
2894 spin_unlock(&delayed_refs
->lock
);
2896 btrfs_release_path(path
);
2899 * Mutex was contended, block until it's released and let
2902 mutex_lock(&head
->mutex
);
2903 mutex_unlock(&head
->mutex
);
2904 btrfs_put_delayed_ref(&head
->node
);
2907 spin_unlock(&delayed_refs
->lock
);
2909 spin_lock(&head
->lock
);
2910 node
= rb_first(&head
->ref_root
);
2912 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
, rb_node
);
2913 node
= rb_next(node
);
2915 /* If it's a shared ref we know a cross reference exists */
2916 if (ref
->type
!= BTRFS_EXTENT_DATA_REF_KEY
) {
2921 data_ref
= btrfs_delayed_node_to_data_ref(ref
);
2924 * If our ref doesn't match the one we're currently looking at
2925 * then we have a cross reference.
2927 if (data_ref
->root
!= root
->root_key
.objectid
||
2928 data_ref
->objectid
!= objectid
||
2929 data_ref
->offset
!= offset
) {
2934 spin_unlock(&head
->lock
);
2935 mutex_unlock(&head
->mutex
);
2939 static noinline
int check_committed_ref(struct btrfs_trans_handle
*trans
,
2940 struct btrfs_root
*root
,
2941 struct btrfs_path
*path
,
2942 u64 objectid
, u64 offset
, u64 bytenr
)
2944 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
2945 struct extent_buffer
*leaf
;
2946 struct btrfs_extent_data_ref
*ref
;
2947 struct btrfs_extent_inline_ref
*iref
;
2948 struct btrfs_extent_item
*ei
;
2949 struct btrfs_key key
;
2953 key
.objectid
= bytenr
;
2954 key
.offset
= (u64
)-1;
2955 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2957 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
2960 BUG_ON(ret
== 0); /* Corruption */
2963 if (path
->slots
[0] == 0)
2967 leaf
= path
->nodes
[0];
2968 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2970 if (key
.objectid
!= bytenr
|| key
.type
!= BTRFS_EXTENT_ITEM_KEY
)
2974 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2975 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
2976 if (item_size
< sizeof(*ei
)) {
2977 WARN_ON(item_size
!= sizeof(struct btrfs_extent_item_v0
));
2981 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2983 if (item_size
!= sizeof(*ei
) +
2984 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY
))
2987 if (btrfs_extent_generation(leaf
, ei
) <=
2988 btrfs_root_last_snapshot(&root
->root_item
))
2991 iref
= (struct btrfs_extent_inline_ref
*)(ei
+ 1);
2992 if (btrfs_extent_inline_ref_type(leaf
, iref
) !=
2993 BTRFS_EXTENT_DATA_REF_KEY
)
2996 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
2997 if (btrfs_extent_refs(leaf
, ei
) !=
2998 btrfs_extent_data_ref_count(leaf
, ref
) ||
2999 btrfs_extent_data_ref_root(leaf
, ref
) !=
3000 root
->root_key
.objectid
||
3001 btrfs_extent_data_ref_objectid(leaf
, ref
) != objectid
||
3002 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
3010 int btrfs_cross_ref_exist(struct btrfs_trans_handle
*trans
,
3011 struct btrfs_root
*root
,
3012 u64 objectid
, u64 offset
, u64 bytenr
)
3014 struct btrfs_path
*path
;
3018 path
= btrfs_alloc_path();
3023 ret
= check_committed_ref(trans
, root
, path
, objectid
,
3025 if (ret
&& ret
!= -ENOENT
)
3028 ret2
= check_delayed_ref(trans
, root
, path
, objectid
,
3030 } while (ret2
== -EAGAIN
);
3032 if (ret2
&& ret2
!= -ENOENT
) {
3037 if (ret
!= -ENOENT
|| ret2
!= -ENOENT
)
3040 btrfs_free_path(path
);
3041 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
3046 static int __btrfs_mod_ref(struct btrfs_trans_handle
*trans
,
3047 struct btrfs_root
*root
,
3048 struct extent_buffer
*buf
,
3049 int full_backref
, int inc
)
3056 struct btrfs_key key
;
3057 struct btrfs_file_extent_item
*fi
;
3061 int (*process_func
)(struct btrfs_trans_handle
*, struct btrfs_root
*,
3062 u64
, u64
, u64
, u64
, u64
, u64
, int);
3065 if (btrfs_test_is_dummy_root(root
))
3068 ref_root
= btrfs_header_owner(buf
);
3069 nritems
= btrfs_header_nritems(buf
);
3070 level
= btrfs_header_level(buf
);
3072 if (!test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) && level
== 0)
3076 process_func
= btrfs_inc_extent_ref
;
3078 process_func
= btrfs_free_extent
;
3081 parent
= buf
->start
;
3085 for (i
= 0; i
< nritems
; i
++) {
3087 btrfs_item_key_to_cpu(buf
, &key
, i
);
3088 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
3090 fi
= btrfs_item_ptr(buf
, i
,
3091 struct btrfs_file_extent_item
);
3092 if (btrfs_file_extent_type(buf
, fi
) ==
3093 BTRFS_FILE_EXTENT_INLINE
)
3095 bytenr
= btrfs_file_extent_disk_bytenr(buf
, fi
);
3099 num_bytes
= btrfs_file_extent_disk_num_bytes(buf
, fi
);
3100 key
.offset
-= btrfs_file_extent_offset(buf
, fi
);
3101 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
3102 parent
, ref_root
, key
.objectid
,
3107 bytenr
= btrfs_node_blockptr(buf
, i
);
3108 num_bytes
= root
->nodesize
;
3109 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
3110 parent
, ref_root
, level
- 1, 0,
3121 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3122 struct extent_buffer
*buf
, int full_backref
)
3124 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 1);
3127 int btrfs_dec_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3128 struct extent_buffer
*buf
, int full_backref
)
3130 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 0);
3133 static int write_one_cache_group(struct btrfs_trans_handle
*trans
,
3134 struct btrfs_root
*root
,
3135 struct btrfs_path
*path
,
3136 struct btrfs_block_group_cache
*cache
)
3139 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
3141 struct extent_buffer
*leaf
;
3143 ret
= btrfs_search_slot(trans
, extent_root
, &cache
->key
, path
, 0, 1);
3146 BUG_ON(ret
); /* Corruption */
3148 leaf
= path
->nodes
[0];
3149 bi
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
3150 write_extent_buffer(leaf
, &cache
->item
, bi
, sizeof(cache
->item
));
3151 btrfs_mark_buffer_dirty(leaf
);
3152 btrfs_release_path(path
);
3155 btrfs_abort_transaction(trans
, root
, ret
);
3162 static struct btrfs_block_group_cache
*
3163 next_block_group(struct btrfs_root
*root
,
3164 struct btrfs_block_group_cache
*cache
)
3166 struct rb_node
*node
;
3168 spin_lock(&root
->fs_info
->block_group_cache_lock
);
3170 /* If our block group was removed, we need a full search. */
3171 if (RB_EMPTY_NODE(&cache
->cache_node
)) {
3172 const u64 next_bytenr
= cache
->key
.objectid
+ cache
->key
.offset
;
3174 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
3175 btrfs_put_block_group(cache
);
3176 cache
= btrfs_lookup_first_block_group(root
->fs_info
,
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
);
3521 INIT_LIST_HEAD(&found
->ro_bgs
);
3523 ret
= kobject_init_and_add(&found
->kobj
, &space_info_ktype
,
3524 info
->space_info_kobj
, "%s",
3525 alloc_name(found
->flags
));
3531 *space_info
= found
;
3532 list_add_rcu(&found
->list
, &info
->space_info
);
3533 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3534 info
->data_sinfo
= found
;
3539 static void set_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
3541 u64 extra_flags
= chunk_to_extended(flags
) &
3542 BTRFS_EXTENDED_PROFILE_MASK
;
3544 write_seqlock(&fs_info
->profiles_lock
);
3545 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3546 fs_info
->avail_data_alloc_bits
|= extra_flags
;
3547 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
3548 fs_info
->avail_metadata_alloc_bits
|= extra_flags
;
3549 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
3550 fs_info
->avail_system_alloc_bits
|= extra_flags
;
3551 write_sequnlock(&fs_info
->profiles_lock
);
3555 * returns target flags in extended format or 0 if restripe for this
3556 * chunk_type is not in progress
3558 * should be called with either volume_mutex or balance_lock held
3560 static u64
get_restripe_target(struct btrfs_fs_info
*fs_info
, u64 flags
)
3562 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3568 if (flags
& BTRFS_BLOCK_GROUP_DATA
&&
3569 bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3570 target
= BTRFS_BLOCK_GROUP_DATA
| bctl
->data
.target
;
3571 } else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
&&
3572 bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3573 target
= BTRFS_BLOCK_GROUP_SYSTEM
| bctl
->sys
.target
;
3574 } else if (flags
& BTRFS_BLOCK_GROUP_METADATA
&&
3575 bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3576 target
= BTRFS_BLOCK_GROUP_METADATA
| bctl
->meta
.target
;
3583 * @flags: available profiles in extended format (see ctree.h)
3585 * Returns reduced profile in chunk format. If profile changing is in
3586 * progress (either running or paused) picks the target profile (if it's
3587 * already available), otherwise falls back to plain reducing.
3589 static u64
btrfs_reduce_alloc_profile(struct btrfs_root
*root
, u64 flags
)
3591 u64 num_devices
= root
->fs_info
->fs_devices
->rw_devices
;
3596 * see if restripe for this chunk_type is in progress, if so
3597 * try to reduce to the target profile
3599 spin_lock(&root
->fs_info
->balance_lock
);
3600 target
= get_restripe_target(root
->fs_info
, flags
);
3602 /* pick target profile only if it's already available */
3603 if ((flags
& target
) & BTRFS_EXTENDED_PROFILE_MASK
) {
3604 spin_unlock(&root
->fs_info
->balance_lock
);
3605 return extended_to_chunk(target
);
3608 spin_unlock(&root
->fs_info
->balance_lock
);
3610 /* First, mask out the RAID levels which aren't possible */
3611 if (num_devices
== 1)
3612 flags
&= ~(BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID0
|
3613 BTRFS_BLOCK_GROUP_RAID5
);
3614 if (num_devices
< 3)
3615 flags
&= ~BTRFS_BLOCK_GROUP_RAID6
;
3616 if (num_devices
< 4)
3617 flags
&= ~BTRFS_BLOCK_GROUP_RAID10
;
3619 tmp
= flags
& (BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID0
|
3620 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID5
|
3621 BTRFS_BLOCK_GROUP_RAID6
| BTRFS_BLOCK_GROUP_RAID10
);
3624 if (tmp
& BTRFS_BLOCK_GROUP_RAID6
)
3625 tmp
= BTRFS_BLOCK_GROUP_RAID6
;
3626 else if (tmp
& BTRFS_BLOCK_GROUP_RAID5
)
3627 tmp
= BTRFS_BLOCK_GROUP_RAID5
;
3628 else if (tmp
& BTRFS_BLOCK_GROUP_RAID10
)
3629 tmp
= BTRFS_BLOCK_GROUP_RAID10
;
3630 else if (tmp
& BTRFS_BLOCK_GROUP_RAID1
)
3631 tmp
= BTRFS_BLOCK_GROUP_RAID1
;
3632 else if (tmp
& BTRFS_BLOCK_GROUP_RAID0
)
3633 tmp
= BTRFS_BLOCK_GROUP_RAID0
;
3635 return extended_to_chunk(flags
| tmp
);
3638 static u64
get_alloc_profile(struct btrfs_root
*root
, u64 orig_flags
)
3645 seq
= read_seqbegin(&root
->fs_info
->profiles_lock
);
3647 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3648 flags
|= root
->fs_info
->avail_data_alloc_bits
;
3649 else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
3650 flags
|= root
->fs_info
->avail_system_alloc_bits
;
3651 else if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
3652 flags
|= root
->fs_info
->avail_metadata_alloc_bits
;
3653 } while (read_seqretry(&root
->fs_info
->profiles_lock
, seq
));
3655 return btrfs_reduce_alloc_profile(root
, flags
);
3658 u64
btrfs_get_alloc_profile(struct btrfs_root
*root
, int data
)
3664 flags
= BTRFS_BLOCK_GROUP_DATA
;
3665 else if (root
== root
->fs_info
->chunk_root
)
3666 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
3668 flags
= BTRFS_BLOCK_GROUP_METADATA
;
3670 ret
= get_alloc_profile(root
, flags
);
3675 * This will check the space that the inode allocates from to make sure we have
3676 * enough space for bytes.
3678 int btrfs_check_data_free_space(struct inode
*inode
, u64 bytes
)
3680 struct btrfs_space_info
*data_sinfo
;
3681 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3682 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3684 int ret
= 0, committed
= 0, alloc_chunk
= 1;
3686 /* make sure bytes are sectorsize aligned */
3687 bytes
= ALIGN(bytes
, root
->sectorsize
);
3689 if (btrfs_is_free_space_inode(inode
)) {
3691 ASSERT(current
->journal_info
);
3694 data_sinfo
= fs_info
->data_sinfo
;
3699 /* make sure we have enough space to handle the data first */
3700 spin_lock(&data_sinfo
->lock
);
3701 used
= data_sinfo
->bytes_used
+ data_sinfo
->bytes_reserved
+
3702 data_sinfo
->bytes_pinned
+ data_sinfo
->bytes_readonly
+
3703 data_sinfo
->bytes_may_use
;
3705 if (used
+ bytes
> data_sinfo
->total_bytes
) {
3706 struct btrfs_trans_handle
*trans
;
3709 * if we don't have enough free bytes in this space then we need
3710 * to alloc a new chunk.
3712 if (!data_sinfo
->full
&& alloc_chunk
) {
3715 data_sinfo
->force_alloc
= CHUNK_ALLOC_FORCE
;
3716 spin_unlock(&data_sinfo
->lock
);
3718 alloc_target
= btrfs_get_alloc_profile(root
, 1);
3720 * It is ugly that we don't call nolock join
3721 * transaction for the free space inode case here.
3722 * But it is safe because we only do the data space
3723 * reservation for the free space cache in the
3724 * transaction context, the common join transaction
3725 * just increase the counter of the current transaction
3726 * handler, doesn't try to acquire the trans_lock of
3729 trans
= btrfs_join_transaction(root
);
3731 return PTR_ERR(trans
);
3733 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
3735 CHUNK_ALLOC_NO_FORCE
);
3736 btrfs_end_transaction(trans
, root
);
3745 data_sinfo
= fs_info
->data_sinfo
;
3751 * If we don't have enough pinned space to deal with this
3752 * allocation don't bother committing the transaction.
3754 if (percpu_counter_compare(&data_sinfo
->total_bytes_pinned
,
3757 spin_unlock(&data_sinfo
->lock
);
3759 /* commit the current transaction and try again */
3762 !atomic_read(&root
->fs_info
->open_ioctl_trans
)) {
3765 trans
= btrfs_join_transaction(root
);
3767 return PTR_ERR(trans
);
3768 ret
= btrfs_commit_transaction(trans
, root
);
3774 trace_btrfs_space_reservation(root
->fs_info
,
3775 "space_info:enospc",
3776 data_sinfo
->flags
, bytes
, 1);
3779 data_sinfo
->bytes_may_use
+= bytes
;
3780 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
3781 data_sinfo
->flags
, bytes
, 1);
3782 spin_unlock(&data_sinfo
->lock
);
3788 * Called if we need to clear a data reservation for this inode.
3790 void btrfs_free_reserved_data_space(struct inode
*inode
, u64 bytes
)
3792 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3793 struct btrfs_space_info
*data_sinfo
;
3795 /* make sure bytes are sectorsize aligned */
3796 bytes
= ALIGN(bytes
, root
->sectorsize
);
3798 data_sinfo
= root
->fs_info
->data_sinfo
;
3799 spin_lock(&data_sinfo
->lock
);
3800 WARN_ON(data_sinfo
->bytes_may_use
< bytes
);
3801 data_sinfo
->bytes_may_use
-= bytes
;
3802 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
3803 data_sinfo
->flags
, bytes
, 0);
3804 spin_unlock(&data_sinfo
->lock
);
3807 static void force_metadata_allocation(struct btrfs_fs_info
*info
)
3809 struct list_head
*head
= &info
->space_info
;
3810 struct btrfs_space_info
*found
;
3813 list_for_each_entry_rcu(found
, head
, list
) {
3814 if (found
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
3815 found
->force_alloc
= CHUNK_ALLOC_FORCE
;
3820 static inline u64
calc_global_rsv_need_space(struct btrfs_block_rsv
*global
)
3822 return (global
->size
<< 1);
3825 static int should_alloc_chunk(struct btrfs_root
*root
,
3826 struct btrfs_space_info
*sinfo
, int force
)
3828 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
3829 u64 num_bytes
= sinfo
->total_bytes
- sinfo
->bytes_readonly
;
3830 u64 num_allocated
= sinfo
->bytes_used
+ sinfo
->bytes_reserved
;
3833 if (force
== CHUNK_ALLOC_FORCE
)
3837 * We need to take into account the global rsv because for all intents
3838 * and purposes it's used space. Don't worry about locking the
3839 * global_rsv, it doesn't change except when the transaction commits.
3841 if (sinfo
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
3842 num_allocated
+= calc_global_rsv_need_space(global_rsv
);
3845 * in limited mode, we want to have some free space up to
3846 * about 1% of the FS size.
3848 if (force
== CHUNK_ALLOC_LIMITED
) {
3849 thresh
= btrfs_super_total_bytes(root
->fs_info
->super_copy
);
3850 thresh
= max_t(u64
, 64 * 1024 * 1024,
3851 div_factor_fine(thresh
, 1));
3853 if (num_bytes
- num_allocated
< thresh
)
3857 if (num_allocated
+ 2 * 1024 * 1024 < div_factor(num_bytes
, 8))
3862 static u64
get_system_chunk_thresh(struct btrfs_root
*root
, u64 type
)
3866 if (type
& (BTRFS_BLOCK_GROUP_RAID10
|
3867 BTRFS_BLOCK_GROUP_RAID0
|
3868 BTRFS_BLOCK_GROUP_RAID5
|
3869 BTRFS_BLOCK_GROUP_RAID6
))
3870 num_dev
= root
->fs_info
->fs_devices
->rw_devices
;
3871 else if (type
& BTRFS_BLOCK_GROUP_RAID1
)
3874 num_dev
= 1; /* DUP or single */
3876 /* metadata for updaing devices and chunk tree */
3877 return btrfs_calc_trans_metadata_size(root
, num_dev
+ 1);
3880 static void check_system_chunk(struct btrfs_trans_handle
*trans
,
3881 struct btrfs_root
*root
, u64 type
)
3883 struct btrfs_space_info
*info
;
3887 info
= __find_space_info(root
->fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
3888 spin_lock(&info
->lock
);
3889 left
= info
->total_bytes
- info
->bytes_used
- info
->bytes_pinned
-
3890 info
->bytes_reserved
- info
->bytes_readonly
;
3891 spin_unlock(&info
->lock
);
3893 thresh
= get_system_chunk_thresh(root
, type
);
3894 if (left
< thresh
&& btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
3895 btrfs_info(root
->fs_info
, "left=%llu, need=%llu, flags=%llu",
3896 left
, thresh
, type
);
3897 dump_space_info(info
, 0, 0);
3900 if (left
< thresh
) {
3903 flags
= btrfs_get_alloc_profile(root
->fs_info
->chunk_root
, 0);
3904 btrfs_alloc_chunk(trans
, root
, flags
);
3908 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
,
3909 struct btrfs_root
*extent_root
, u64 flags
, int force
)
3911 struct btrfs_space_info
*space_info
;
3912 struct btrfs_fs_info
*fs_info
= extent_root
->fs_info
;
3913 int wait_for_alloc
= 0;
3916 /* Don't re-enter if we're already allocating a chunk */
3917 if (trans
->allocating_chunk
)
3920 space_info
= __find_space_info(extent_root
->fs_info
, flags
);
3922 ret
= update_space_info(extent_root
->fs_info
, flags
,
3924 BUG_ON(ret
); /* -ENOMEM */
3926 BUG_ON(!space_info
); /* Logic error */
3929 spin_lock(&space_info
->lock
);
3930 if (force
< space_info
->force_alloc
)
3931 force
= space_info
->force_alloc
;
3932 if (space_info
->full
) {
3933 if (should_alloc_chunk(extent_root
, space_info
, force
))
3937 spin_unlock(&space_info
->lock
);
3941 if (!should_alloc_chunk(extent_root
, space_info
, force
)) {
3942 spin_unlock(&space_info
->lock
);
3944 } else if (space_info
->chunk_alloc
) {
3947 space_info
->chunk_alloc
= 1;
3950 spin_unlock(&space_info
->lock
);
3952 mutex_lock(&fs_info
->chunk_mutex
);
3955 * The chunk_mutex is held throughout the entirety of a chunk
3956 * allocation, so once we've acquired the chunk_mutex we know that the
3957 * other guy is done and we need to recheck and see if we should
3960 if (wait_for_alloc
) {
3961 mutex_unlock(&fs_info
->chunk_mutex
);
3966 trans
->allocating_chunk
= true;
3969 * If we have mixed data/metadata chunks we want to make sure we keep
3970 * allocating mixed chunks instead of individual chunks.
3972 if (btrfs_mixed_space_info(space_info
))
3973 flags
|= (BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
);
3976 * if we're doing a data chunk, go ahead and make sure that
3977 * we keep a reasonable number of metadata chunks allocated in the
3980 if (flags
& BTRFS_BLOCK_GROUP_DATA
&& fs_info
->metadata_ratio
) {
3981 fs_info
->data_chunk_allocations
++;
3982 if (!(fs_info
->data_chunk_allocations
%
3983 fs_info
->metadata_ratio
))
3984 force_metadata_allocation(fs_info
);
3988 * Check if we have enough space in SYSTEM chunk because we may need
3989 * to update devices.
3991 check_system_chunk(trans
, extent_root
, flags
);
3993 ret
= btrfs_alloc_chunk(trans
, extent_root
, flags
);
3994 trans
->allocating_chunk
= false;
3996 spin_lock(&space_info
->lock
);
3997 if (ret
< 0 && ret
!= -ENOSPC
)
4000 space_info
->full
= 1;
4004 space_info
->force_alloc
= CHUNK_ALLOC_NO_FORCE
;
4006 space_info
->chunk_alloc
= 0;
4007 spin_unlock(&space_info
->lock
);
4008 mutex_unlock(&fs_info
->chunk_mutex
);
4012 static int can_overcommit(struct btrfs_root
*root
,
4013 struct btrfs_space_info
*space_info
, u64 bytes
,
4014 enum btrfs_reserve_flush_enum flush
)
4016 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
4017 u64 profile
= btrfs_get_alloc_profile(root
, 0);
4022 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4023 space_info
->bytes_pinned
+ space_info
->bytes_readonly
;
4026 * We only want to allow over committing if we have lots of actual space
4027 * free, but if we don't have enough space to handle the global reserve
4028 * space then we could end up having a real enospc problem when trying
4029 * to allocate a chunk or some other such important allocation.
4031 spin_lock(&global_rsv
->lock
);
4032 space_size
= calc_global_rsv_need_space(global_rsv
);
4033 spin_unlock(&global_rsv
->lock
);
4034 if (used
+ space_size
>= space_info
->total_bytes
)
4037 used
+= space_info
->bytes_may_use
;
4039 spin_lock(&root
->fs_info
->free_chunk_lock
);
4040 avail
= root
->fs_info
->free_chunk_space
;
4041 spin_unlock(&root
->fs_info
->free_chunk_lock
);
4044 * If we have dup, raid1 or raid10 then only half of the free
4045 * space is actually useable. For raid56, the space info used
4046 * doesn't include the parity drive, so we don't have to
4049 if (profile
& (BTRFS_BLOCK_GROUP_DUP
|
4050 BTRFS_BLOCK_GROUP_RAID1
|
4051 BTRFS_BLOCK_GROUP_RAID10
))
4055 * If we aren't flushing all things, let us overcommit up to
4056 * 1/2th of the space. If we can flush, don't let us overcommit
4057 * too much, let it overcommit up to 1/8 of the space.
4059 if (flush
== BTRFS_RESERVE_FLUSH_ALL
)
4064 if (used
+ bytes
< space_info
->total_bytes
+ avail
)
4069 static void btrfs_writeback_inodes_sb_nr(struct btrfs_root
*root
,
4070 unsigned long nr_pages
, int nr_items
)
4072 struct super_block
*sb
= root
->fs_info
->sb
;
4074 if (down_read_trylock(&sb
->s_umount
)) {
4075 writeback_inodes_sb_nr(sb
, nr_pages
, WB_REASON_FS_FREE_SPACE
);
4076 up_read(&sb
->s_umount
);
4079 * We needn't worry the filesystem going from r/w to r/o though
4080 * we don't acquire ->s_umount mutex, because the filesystem
4081 * should guarantee the delalloc inodes list be empty after
4082 * the filesystem is readonly(all dirty pages are written to
4085 btrfs_start_delalloc_roots(root
->fs_info
, 0, nr_items
);
4086 if (!current
->journal_info
)
4087 btrfs_wait_ordered_roots(root
->fs_info
, nr_items
);
4091 static inline int calc_reclaim_items_nr(struct btrfs_root
*root
, u64 to_reclaim
)
4096 bytes
= btrfs_calc_trans_metadata_size(root
, 1);
4097 nr
= (int)div64_u64(to_reclaim
, bytes
);
4103 #define EXTENT_SIZE_PER_ITEM (256 * 1024)
4106 * shrink metadata reservation for delalloc
4108 static void shrink_delalloc(struct btrfs_root
*root
, u64 to_reclaim
, u64 orig
,
4111 struct btrfs_block_rsv
*block_rsv
;
4112 struct btrfs_space_info
*space_info
;
4113 struct btrfs_trans_handle
*trans
;
4117 unsigned long nr_pages
;
4120 enum btrfs_reserve_flush_enum flush
;
4122 /* Calc the number of the pages we need flush for space reservation */
4123 items
= calc_reclaim_items_nr(root
, to_reclaim
);
4124 to_reclaim
= items
* EXTENT_SIZE_PER_ITEM
;
4126 trans
= (struct btrfs_trans_handle
*)current
->journal_info
;
4127 block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
4128 space_info
= block_rsv
->space_info
;
4130 delalloc_bytes
= percpu_counter_sum_positive(
4131 &root
->fs_info
->delalloc_bytes
);
4132 if (delalloc_bytes
== 0) {
4136 btrfs_wait_ordered_roots(root
->fs_info
, items
);
4141 while (delalloc_bytes
&& loops
< 3) {
4142 max_reclaim
= min(delalloc_bytes
, to_reclaim
);
4143 nr_pages
= max_reclaim
>> PAGE_CACHE_SHIFT
;
4144 btrfs_writeback_inodes_sb_nr(root
, nr_pages
, items
);
4146 * We need to wait for the async pages to actually start before
4149 max_reclaim
= atomic_read(&root
->fs_info
->async_delalloc_pages
);
4153 if (max_reclaim
<= nr_pages
)
4156 max_reclaim
-= nr_pages
;
4158 wait_event(root
->fs_info
->async_submit_wait
,
4159 atomic_read(&root
->fs_info
->async_delalloc_pages
) <=
4163 flush
= BTRFS_RESERVE_FLUSH_ALL
;
4165 flush
= BTRFS_RESERVE_NO_FLUSH
;
4166 spin_lock(&space_info
->lock
);
4167 if (can_overcommit(root
, space_info
, orig
, flush
)) {
4168 spin_unlock(&space_info
->lock
);
4171 spin_unlock(&space_info
->lock
);
4174 if (wait_ordered
&& !trans
) {
4175 btrfs_wait_ordered_roots(root
->fs_info
, items
);
4177 time_left
= schedule_timeout_killable(1);
4181 delalloc_bytes
= percpu_counter_sum_positive(
4182 &root
->fs_info
->delalloc_bytes
);
4187 * maybe_commit_transaction - possibly commit the transaction if its ok to
4188 * @root - the root we're allocating for
4189 * @bytes - the number of bytes we want to reserve
4190 * @force - force the commit
4192 * This will check to make sure that committing the transaction will actually
4193 * get us somewhere and then commit the transaction if it does. Otherwise it
4194 * will return -ENOSPC.
4196 static int may_commit_transaction(struct btrfs_root
*root
,
4197 struct btrfs_space_info
*space_info
,
4198 u64 bytes
, int force
)
4200 struct btrfs_block_rsv
*delayed_rsv
= &root
->fs_info
->delayed_block_rsv
;
4201 struct btrfs_trans_handle
*trans
;
4203 trans
= (struct btrfs_trans_handle
*)current
->journal_info
;
4210 /* See if there is enough pinned space to make this reservation */
4211 if (percpu_counter_compare(&space_info
->total_bytes_pinned
,
4216 * See if there is some space in the delayed insertion reservation for
4219 if (space_info
!= delayed_rsv
->space_info
)
4222 spin_lock(&delayed_rsv
->lock
);
4223 if (percpu_counter_compare(&space_info
->total_bytes_pinned
,
4224 bytes
- delayed_rsv
->size
) >= 0) {
4225 spin_unlock(&delayed_rsv
->lock
);
4228 spin_unlock(&delayed_rsv
->lock
);
4231 trans
= btrfs_join_transaction(root
);
4235 return btrfs_commit_transaction(trans
, root
);
4239 FLUSH_DELAYED_ITEMS_NR
= 1,
4240 FLUSH_DELAYED_ITEMS
= 2,
4242 FLUSH_DELALLOC_WAIT
= 4,
4247 static int flush_space(struct btrfs_root
*root
,
4248 struct btrfs_space_info
*space_info
, u64 num_bytes
,
4249 u64 orig_bytes
, int state
)
4251 struct btrfs_trans_handle
*trans
;
4256 case FLUSH_DELAYED_ITEMS_NR
:
4257 case FLUSH_DELAYED_ITEMS
:
4258 if (state
== FLUSH_DELAYED_ITEMS_NR
)
4259 nr
= calc_reclaim_items_nr(root
, num_bytes
) * 2;
4263 trans
= btrfs_join_transaction(root
);
4264 if (IS_ERR(trans
)) {
4265 ret
= PTR_ERR(trans
);
4268 ret
= btrfs_run_delayed_items_nr(trans
, root
, nr
);
4269 btrfs_end_transaction(trans
, root
);
4271 case FLUSH_DELALLOC
:
4272 case FLUSH_DELALLOC_WAIT
:
4273 shrink_delalloc(root
, num_bytes
* 2, orig_bytes
,
4274 state
== FLUSH_DELALLOC_WAIT
);
4277 trans
= btrfs_join_transaction(root
);
4278 if (IS_ERR(trans
)) {
4279 ret
= PTR_ERR(trans
);
4282 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
4283 btrfs_get_alloc_profile(root
, 0),
4284 CHUNK_ALLOC_NO_FORCE
);
4285 btrfs_end_transaction(trans
, root
);
4290 ret
= may_commit_transaction(root
, space_info
, orig_bytes
, 0);
4301 btrfs_calc_reclaim_metadata_size(struct btrfs_root
*root
,
4302 struct btrfs_space_info
*space_info
)
4308 to_reclaim
= min_t(u64
, num_online_cpus() * 1024 * 1024,
4310 spin_lock(&space_info
->lock
);
4311 if (can_overcommit(root
, space_info
, to_reclaim
,
4312 BTRFS_RESERVE_FLUSH_ALL
)) {
4317 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4318 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4319 space_info
->bytes_may_use
;
4320 if (can_overcommit(root
, space_info
, 1024 * 1024,
4321 BTRFS_RESERVE_FLUSH_ALL
))
4322 expected
= div_factor_fine(space_info
->total_bytes
, 95);
4324 expected
= div_factor_fine(space_info
->total_bytes
, 90);
4326 if (used
> expected
)
4327 to_reclaim
= used
- expected
;
4330 to_reclaim
= min(to_reclaim
, space_info
->bytes_may_use
+
4331 space_info
->bytes_reserved
);
4333 spin_unlock(&space_info
->lock
);
4338 static inline int need_do_async_reclaim(struct btrfs_space_info
*space_info
,
4339 struct btrfs_fs_info
*fs_info
, u64 used
)
4341 return (used
>= div_factor_fine(space_info
->total_bytes
, 98) &&
4342 !btrfs_fs_closing(fs_info
) &&
4343 !test_bit(BTRFS_FS_STATE_REMOUNTING
, &fs_info
->fs_state
));
4346 static int btrfs_need_do_async_reclaim(struct btrfs_space_info
*space_info
,
4347 struct btrfs_fs_info
*fs_info
,
4352 spin_lock(&space_info
->lock
);
4354 * We run out of space and have not got any free space via flush_space,
4355 * so don't bother doing async reclaim.
4357 if (flush_state
> COMMIT_TRANS
&& space_info
->full
) {
4358 spin_unlock(&space_info
->lock
);
4362 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4363 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4364 space_info
->bytes_may_use
;
4365 if (need_do_async_reclaim(space_info
, fs_info
, used
)) {
4366 spin_unlock(&space_info
->lock
);
4369 spin_unlock(&space_info
->lock
);
4374 static void btrfs_async_reclaim_metadata_space(struct work_struct
*work
)
4376 struct btrfs_fs_info
*fs_info
;
4377 struct btrfs_space_info
*space_info
;
4381 fs_info
= container_of(work
, struct btrfs_fs_info
, async_reclaim_work
);
4382 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4384 to_reclaim
= btrfs_calc_reclaim_metadata_size(fs_info
->fs_root
,
4389 flush_state
= FLUSH_DELAYED_ITEMS_NR
;
4391 flush_space(fs_info
->fs_root
, space_info
, to_reclaim
,
4392 to_reclaim
, flush_state
);
4394 if (!btrfs_need_do_async_reclaim(space_info
, fs_info
,
4397 } while (flush_state
<= COMMIT_TRANS
);
4399 if (btrfs_need_do_async_reclaim(space_info
, fs_info
, flush_state
))
4400 queue_work(system_unbound_wq
, work
);
4403 void btrfs_init_async_reclaim_work(struct work_struct
*work
)
4405 INIT_WORK(work
, btrfs_async_reclaim_metadata_space
);
4409 * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
4410 * @root - the root we're allocating for
4411 * @block_rsv - the block_rsv we're allocating for
4412 * @orig_bytes - the number of bytes we want
4413 * @flush - whether or not we can flush to make our reservation
4415 * This will reserve orgi_bytes number of bytes from the space info associated
4416 * with the block_rsv. If there is not enough space it will make an attempt to
4417 * flush out space to make room. It will do this by flushing delalloc if
4418 * possible or committing the transaction. If flush is 0 then no attempts to
4419 * regain reservations will be made and this will fail if there is not enough
4422 static int reserve_metadata_bytes(struct btrfs_root
*root
,
4423 struct btrfs_block_rsv
*block_rsv
,
4425 enum btrfs_reserve_flush_enum flush
)
4427 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
4429 u64 num_bytes
= orig_bytes
;
4430 int flush_state
= FLUSH_DELAYED_ITEMS_NR
;
4432 bool flushing
= false;
4436 spin_lock(&space_info
->lock
);
4438 * We only want to wait if somebody other than us is flushing and we
4439 * are actually allowed to flush all things.
4441 while (flush
== BTRFS_RESERVE_FLUSH_ALL
&& !flushing
&&
4442 space_info
->flush
) {
4443 spin_unlock(&space_info
->lock
);
4445 * If we have a trans handle we can't wait because the flusher
4446 * may have to commit the transaction, which would mean we would
4447 * deadlock since we are waiting for the flusher to finish, but
4448 * hold the current transaction open.
4450 if (current
->journal_info
)
4452 ret
= wait_event_killable(space_info
->wait
, !space_info
->flush
);
4453 /* Must have been killed, return */
4457 spin_lock(&space_info
->lock
);
4461 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4462 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4463 space_info
->bytes_may_use
;
4466 * The idea here is that we've not already over-reserved the block group
4467 * then we can go ahead and save our reservation first and then start
4468 * flushing if we need to. Otherwise if we've already overcommitted
4469 * lets start flushing stuff first and then come back and try to make
4472 if (used
<= space_info
->total_bytes
) {
4473 if (used
+ orig_bytes
<= space_info
->total_bytes
) {
4474 space_info
->bytes_may_use
+= orig_bytes
;
4475 trace_btrfs_space_reservation(root
->fs_info
,
4476 "space_info", space_info
->flags
, orig_bytes
, 1);
4480 * Ok set num_bytes to orig_bytes since we aren't
4481 * overocmmitted, this way we only try and reclaim what
4484 num_bytes
= orig_bytes
;
4488 * Ok we're over committed, set num_bytes to the overcommitted
4489 * amount plus the amount of bytes that we need for this
4492 num_bytes
= used
- space_info
->total_bytes
+
4496 if (ret
&& can_overcommit(root
, space_info
, orig_bytes
, flush
)) {
4497 space_info
->bytes_may_use
+= orig_bytes
;
4498 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
4499 space_info
->flags
, orig_bytes
,
4505 * Couldn't make our reservation, save our place so while we're trying
4506 * to reclaim space we can actually use it instead of somebody else
4507 * stealing it from us.
4509 * We make the other tasks wait for the flush only when we can flush
4512 if (ret
&& flush
!= BTRFS_RESERVE_NO_FLUSH
) {
4514 space_info
->flush
= 1;
4515 } else if (!ret
&& space_info
->flags
& BTRFS_BLOCK_GROUP_METADATA
) {
4518 * We will do the space reservation dance during log replay,
4519 * which means we won't have fs_info->fs_root set, so don't do
4520 * the async reclaim as we will panic.
4522 if (!root
->fs_info
->log_root_recovering
&&
4523 need_do_async_reclaim(space_info
, root
->fs_info
, used
) &&
4524 !work_busy(&root
->fs_info
->async_reclaim_work
))
4525 queue_work(system_unbound_wq
,
4526 &root
->fs_info
->async_reclaim_work
);
4528 spin_unlock(&space_info
->lock
);
4530 if (!ret
|| flush
== BTRFS_RESERVE_NO_FLUSH
)
4533 ret
= flush_space(root
, space_info
, num_bytes
, orig_bytes
,
4538 * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock
4539 * would happen. So skip delalloc flush.
4541 if (flush
== BTRFS_RESERVE_FLUSH_LIMIT
&&
4542 (flush_state
== FLUSH_DELALLOC
||
4543 flush_state
== FLUSH_DELALLOC_WAIT
))
4544 flush_state
= ALLOC_CHUNK
;
4548 else if (flush
== BTRFS_RESERVE_FLUSH_LIMIT
&&
4549 flush_state
< COMMIT_TRANS
)
4551 else if (flush
== BTRFS_RESERVE_FLUSH_ALL
&&
4552 flush_state
<= COMMIT_TRANS
)
4556 if (ret
== -ENOSPC
&&
4557 unlikely(root
->orphan_cleanup_state
== ORPHAN_CLEANUP_STARTED
)) {
4558 struct btrfs_block_rsv
*global_rsv
=
4559 &root
->fs_info
->global_block_rsv
;
4561 if (block_rsv
!= global_rsv
&&
4562 !block_rsv_use_bytes(global_rsv
, orig_bytes
))
4566 trace_btrfs_space_reservation(root
->fs_info
,
4567 "space_info:enospc",
4568 space_info
->flags
, orig_bytes
, 1);
4570 spin_lock(&space_info
->lock
);
4571 space_info
->flush
= 0;
4572 wake_up_all(&space_info
->wait
);
4573 spin_unlock(&space_info
->lock
);
4578 static struct btrfs_block_rsv
*get_block_rsv(
4579 const struct btrfs_trans_handle
*trans
,
4580 const struct btrfs_root
*root
)
4582 struct btrfs_block_rsv
*block_rsv
= NULL
;
4584 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
4585 block_rsv
= trans
->block_rsv
;
4587 if (root
== root
->fs_info
->csum_root
&& trans
->adding_csums
)
4588 block_rsv
= trans
->block_rsv
;
4590 if (root
== root
->fs_info
->uuid_root
)
4591 block_rsv
= trans
->block_rsv
;
4594 block_rsv
= root
->block_rsv
;
4597 block_rsv
= &root
->fs_info
->empty_block_rsv
;
4602 static int block_rsv_use_bytes(struct btrfs_block_rsv
*block_rsv
,
4606 spin_lock(&block_rsv
->lock
);
4607 if (block_rsv
->reserved
>= num_bytes
) {
4608 block_rsv
->reserved
-= num_bytes
;
4609 if (block_rsv
->reserved
< block_rsv
->size
)
4610 block_rsv
->full
= 0;
4613 spin_unlock(&block_rsv
->lock
);
4617 static void block_rsv_add_bytes(struct btrfs_block_rsv
*block_rsv
,
4618 u64 num_bytes
, int update_size
)
4620 spin_lock(&block_rsv
->lock
);
4621 block_rsv
->reserved
+= num_bytes
;
4623 block_rsv
->size
+= num_bytes
;
4624 else if (block_rsv
->reserved
>= block_rsv
->size
)
4625 block_rsv
->full
= 1;
4626 spin_unlock(&block_rsv
->lock
);
4629 int btrfs_cond_migrate_bytes(struct btrfs_fs_info
*fs_info
,
4630 struct btrfs_block_rsv
*dest
, u64 num_bytes
,
4633 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
4636 if (global_rsv
->space_info
!= dest
->space_info
)
4639 spin_lock(&global_rsv
->lock
);
4640 min_bytes
= div_factor(global_rsv
->size
, min_factor
);
4641 if (global_rsv
->reserved
< min_bytes
+ num_bytes
) {
4642 spin_unlock(&global_rsv
->lock
);
4645 global_rsv
->reserved
-= num_bytes
;
4646 if (global_rsv
->reserved
< global_rsv
->size
)
4647 global_rsv
->full
= 0;
4648 spin_unlock(&global_rsv
->lock
);
4650 block_rsv_add_bytes(dest
, num_bytes
, 1);
4654 static void block_rsv_release_bytes(struct btrfs_fs_info
*fs_info
,
4655 struct btrfs_block_rsv
*block_rsv
,
4656 struct btrfs_block_rsv
*dest
, u64 num_bytes
)
4658 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
4660 spin_lock(&block_rsv
->lock
);
4661 if (num_bytes
== (u64
)-1)
4662 num_bytes
= block_rsv
->size
;
4663 block_rsv
->size
-= num_bytes
;
4664 if (block_rsv
->reserved
>= block_rsv
->size
) {
4665 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
4666 block_rsv
->reserved
= block_rsv
->size
;
4667 block_rsv
->full
= 1;
4671 spin_unlock(&block_rsv
->lock
);
4673 if (num_bytes
> 0) {
4675 spin_lock(&dest
->lock
);
4679 bytes_to_add
= dest
->size
- dest
->reserved
;
4680 bytes_to_add
= min(num_bytes
, bytes_to_add
);
4681 dest
->reserved
+= bytes_to_add
;
4682 if (dest
->reserved
>= dest
->size
)
4684 num_bytes
-= bytes_to_add
;
4686 spin_unlock(&dest
->lock
);
4689 spin_lock(&space_info
->lock
);
4690 space_info
->bytes_may_use
-= num_bytes
;
4691 trace_btrfs_space_reservation(fs_info
, "space_info",
4692 space_info
->flags
, num_bytes
, 0);
4693 spin_unlock(&space_info
->lock
);
4698 static int block_rsv_migrate_bytes(struct btrfs_block_rsv
*src
,
4699 struct btrfs_block_rsv
*dst
, u64 num_bytes
)
4703 ret
= block_rsv_use_bytes(src
, num_bytes
);
4707 block_rsv_add_bytes(dst
, num_bytes
, 1);
4711 void btrfs_init_block_rsv(struct btrfs_block_rsv
*rsv
, unsigned short type
)
4713 memset(rsv
, 0, sizeof(*rsv
));
4714 spin_lock_init(&rsv
->lock
);
4718 struct btrfs_block_rsv
*btrfs_alloc_block_rsv(struct btrfs_root
*root
,
4719 unsigned short type
)
4721 struct btrfs_block_rsv
*block_rsv
;
4722 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4724 block_rsv
= kmalloc(sizeof(*block_rsv
), GFP_NOFS
);
4728 btrfs_init_block_rsv(block_rsv
, type
);
4729 block_rsv
->space_info
= __find_space_info(fs_info
,
4730 BTRFS_BLOCK_GROUP_METADATA
);
4734 void btrfs_free_block_rsv(struct btrfs_root
*root
,
4735 struct btrfs_block_rsv
*rsv
)
4739 btrfs_block_rsv_release(root
, rsv
, (u64
)-1);
4743 int btrfs_block_rsv_add(struct btrfs_root
*root
,
4744 struct btrfs_block_rsv
*block_rsv
, u64 num_bytes
,
4745 enum btrfs_reserve_flush_enum flush
)
4752 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
4754 block_rsv_add_bytes(block_rsv
, num_bytes
, 1);
4761 int btrfs_block_rsv_check(struct btrfs_root
*root
,
4762 struct btrfs_block_rsv
*block_rsv
, int min_factor
)
4770 spin_lock(&block_rsv
->lock
);
4771 num_bytes
= div_factor(block_rsv
->size
, min_factor
);
4772 if (block_rsv
->reserved
>= num_bytes
)
4774 spin_unlock(&block_rsv
->lock
);
4779 int btrfs_block_rsv_refill(struct btrfs_root
*root
,
4780 struct btrfs_block_rsv
*block_rsv
, u64 min_reserved
,
4781 enum btrfs_reserve_flush_enum flush
)
4789 spin_lock(&block_rsv
->lock
);
4790 num_bytes
= min_reserved
;
4791 if (block_rsv
->reserved
>= num_bytes
)
4794 num_bytes
-= block_rsv
->reserved
;
4795 spin_unlock(&block_rsv
->lock
);
4800 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
4802 block_rsv_add_bytes(block_rsv
, num_bytes
, 0);
4809 int btrfs_block_rsv_migrate(struct btrfs_block_rsv
*src_rsv
,
4810 struct btrfs_block_rsv
*dst_rsv
,
4813 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
4816 void btrfs_block_rsv_release(struct btrfs_root
*root
,
4817 struct btrfs_block_rsv
*block_rsv
,
4820 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
4821 if (global_rsv
== block_rsv
||
4822 block_rsv
->space_info
!= global_rsv
->space_info
)
4824 block_rsv_release_bytes(root
->fs_info
, block_rsv
, global_rsv
,
4829 * helper to calculate size of global block reservation.
4830 * the desired value is sum of space used by extent tree,
4831 * checksum tree and root tree
4833 static u64
calc_global_metadata_size(struct btrfs_fs_info
*fs_info
)
4835 struct btrfs_space_info
*sinfo
;
4839 int csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
4841 sinfo
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_DATA
);
4842 spin_lock(&sinfo
->lock
);
4843 data_used
= sinfo
->bytes_used
;
4844 spin_unlock(&sinfo
->lock
);
4846 sinfo
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4847 spin_lock(&sinfo
->lock
);
4848 if (sinfo
->flags
& BTRFS_BLOCK_GROUP_DATA
)
4850 meta_used
= sinfo
->bytes_used
;
4851 spin_unlock(&sinfo
->lock
);
4853 num_bytes
= (data_used
>> fs_info
->sb
->s_blocksize_bits
) *
4855 num_bytes
+= div64_u64(data_used
+ meta_used
, 50);
4857 if (num_bytes
* 3 > meta_used
)
4858 num_bytes
= div64_u64(meta_used
, 3);
4860 return ALIGN(num_bytes
, fs_info
->extent_root
->nodesize
<< 10);
4863 static void update_global_block_rsv(struct btrfs_fs_info
*fs_info
)
4865 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
4866 struct btrfs_space_info
*sinfo
= block_rsv
->space_info
;
4869 num_bytes
= calc_global_metadata_size(fs_info
);
4871 spin_lock(&sinfo
->lock
);
4872 spin_lock(&block_rsv
->lock
);
4874 block_rsv
->size
= min_t(u64
, num_bytes
, 512 * 1024 * 1024);
4876 num_bytes
= sinfo
->bytes_used
+ sinfo
->bytes_pinned
+
4877 sinfo
->bytes_reserved
+ sinfo
->bytes_readonly
+
4878 sinfo
->bytes_may_use
;
4880 if (sinfo
->total_bytes
> num_bytes
) {
4881 num_bytes
= sinfo
->total_bytes
- num_bytes
;
4882 block_rsv
->reserved
+= num_bytes
;
4883 sinfo
->bytes_may_use
+= num_bytes
;
4884 trace_btrfs_space_reservation(fs_info
, "space_info",
4885 sinfo
->flags
, num_bytes
, 1);
4888 if (block_rsv
->reserved
>= block_rsv
->size
) {
4889 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
4890 sinfo
->bytes_may_use
-= num_bytes
;
4891 trace_btrfs_space_reservation(fs_info
, "space_info",
4892 sinfo
->flags
, num_bytes
, 0);
4893 block_rsv
->reserved
= block_rsv
->size
;
4894 block_rsv
->full
= 1;
4897 spin_unlock(&block_rsv
->lock
);
4898 spin_unlock(&sinfo
->lock
);
4901 static void init_global_block_rsv(struct btrfs_fs_info
*fs_info
)
4903 struct btrfs_space_info
*space_info
;
4905 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
4906 fs_info
->chunk_block_rsv
.space_info
= space_info
;
4908 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4909 fs_info
->global_block_rsv
.space_info
= space_info
;
4910 fs_info
->delalloc_block_rsv
.space_info
= space_info
;
4911 fs_info
->trans_block_rsv
.space_info
= space_info
;
4912 fs_info
->empty_block_rsv
.space_info
= space_info
;
4913 fs_info
->delayed_block_rsv
.space_info
= space_info
;
4915 fs_info
->extent_root
->block_rsv
= &fs_info
->global_block_rsv
;
4916 fs_info
->csum_root
->block_rsv
= &fs_info
->global_block_rsv
;
4917 fs_info
->dev_root
->block_rsv
= &fs_info
->global_block_rsv
;
4918 fs_info
->tree_root
->block_rsv
= &fs_info
->global_block_rsv
;
4919 if (fs_info
->quota_root
)
4920 fs_info
->quota_root
->block_rsv
= &fs_info
->global_block_rsv
;
4921 fs_info
->chunk_root
->block_rsv
= &fs_info
->chunk_block_rsv
;
4923 update_global_block_rsv(fs_info
);
4926 static void release_global_block_rsv(struct btrfs_fs_info
*fs_info
)
4928 block_rsv_release_bytes(fs_info
, &fs_info
->global_block_rsv
, NULL
,
4930 WARN_ON(fs_info
->delalloc_block_rsv
.size
> 0);
4931 WARN_ON(fs_info
->delalloc_block_rsv
.reserved
> 0);
4932 WARN_ON(fs_info
->trans_block_rsv
.size
> 0);
4933 WARN_ON(fs_info
->trans_block_rsv
.reserved
> 0);
4934 WARN_ON(fs_info
->chunk_block_rsv
.size
> 0);
4935 WARN_ON(fs_info
->chunk_block_rsv
.reserved
> 0);
4936 WARN_ON(fs_info
->delayed_block_rsv
.size
> 0);
4937 WARN_ON(fs_info
->delayed_block_rsv
.reserved
> 0);
4940 void btrfs_trans_release_metadata(struct btrfs_trans_handle
*trans
,
4941 struct btrfs_root
*root
)
4943 if (!trans
->block_rsv
)
4946 if (!trans
->bytes_reserved
)
4949 trace_btrfs_space_reservation(root
->fs_info
, "transaction",
4950 trans
->transid
, trans
->bytes_reserved
, 0);
4951 btrfs_block_rsv_release(root
, trans
->block_rsv
, trans
->bytes_reserved
);
4952 trans
->bytes_reserved
= 0;
4955 /* Can only return 0 or -ENOSPC */
4956 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle
*trans
,
4957 struct inode
*inode
)
4959 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4960 struct btrfs_block_rsv
*src_rsv
= get_block_rsv(trans
, root
);
4961 struct btrfs_block_rsv
*dst_rsv
= root
->orphan_block_rsv
;
4964 * We need to hold space in order to delete our orphan item once we've
4965 * added it, so this takes the reservation so we can release it later
4966 * when we are truly done with the orphan item.
4968 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
4969 trace_btrfs_space_reservation(root
->fs_info
, "orphan",
4970 btrfs_ino(inode
), num_bytes
, 1);
4971 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
4974 void btrfs_orphan_release_metadata(struct inode
*inode
)
4976 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4977 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
4978 trace_btrfs_space_reservation(root
->fs_info
, "orphan",
4979 btrfs_ino(inode
), num_bytes
, 0);
4980 btrfs_block_rsv_release(root
, root
->orphan_block_rsv
, num_bytes
);
4984 * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation
4985 * root: the root of the parent directory
4986 * rsv: block reservation
4987 * items: the number of items that we need do reservation
4988 * qgroup_reserved: used to return the reserved size in qgroup
4990 * This function is used to reserve the space for snapshot/subvolume
4991 * creation and deletion. Those operations are different with the
4992 * common file/directory operations, they change two fs/file trees
4993 * and root tree, the number of items that the qgroup reserves is
4994 * different with the free space reservation. So we can not use
4995 * the space reseravtion mechanism in start_transaction().
4997 int btrfs_subvolume_reserve_metadata(struct btrfs_root
*root
,
4998 struct btrfs_block_rsv
*rsv
,
5000 u64
*qgroup_reserved
,
5001 bool use_global_rsv
)
5005 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
5007 if (root
->fs_info
->quota_enabled
) {
5008 /* One for parent inode, two for dir entries */
5009 num_bytes
= 3 * root
->nodesize
;
5010 ret
= btrfs_qgroup_reserve(root
, num_bytes
);
5017 *qgroup_reserved
= num_bytes
;
5019 num_bytes
= btrfs_calc_trans_metadata_size(root
, items
);
5020 rsv
->space_info
= __find_space_info(root
->fs_info
,
5021 BTRFS_BLOCK_GROUP_METADATA
);
5022 ret
= btrfs_block_rsv_add(root
, rsv
, num_bytes
,
5023 BTRFS_RESERVE_FLUSH_ALL
);
5025 if (ret
== -ENOSPC
&& use_global_rsv
)
5026 ret
= btrfs_block_rsv_migrate(global_rsv
, rsv
, num_bytes
);
5029 if (*qgroup_reserved
)
5030 btrfs_qgroup_free(root
, *qgroup_reserved
);
5036 void btrfs_subvolume_release_metadata(struct btrfs_root
*root
,
5037 struct btrfs_block_rsv
*rsv
,
5038 u64 qgroup_reserved
)
5040 btrfs_block_rsv_release(root
, rsv
, (u64
)-1);
5041 if (qgroup_reserved
)
5042 btrfs_qgroup_free(root
, qgroup_reserved
);
5046 * drop_outstanding_extent - drop an outstanding extent
5047 * @inode: the inode we're dropping the extent for
5049 * This is called when we are freeing up an outstanding extent, either called
5050 * after an error or after an extent is written. This will return the number of
5051 * reserved extents that need to be freed. This must be called with
5052 * BTRFS_I(inode)->lock held.
5054 static unsigned drop_outstanding_extent(struct inode
*inode
)
5056 unsigned drop_inode_space
= 0;
5057 unsigned dropped_extents
= 0;
5059 BUG_ON(!BTRFS_I(inode
)->outstanding_extents
);
5060 BTRFS_I(inode
)->outstanding_extents
--;
5062 if (BTRFS_I(inode
)->outstanding_extents
== 0 &&
5063 test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5064 &BTRFS_I(inode
)->runtime_flags
))
5065 drop_inode_space
= 1;
5068 * If we have more or the same amount of outsanding extents than we have
5069 * reserved then we need to leave the reserved extents count alone.
5071 if (BTRFS_I(inode
)->outstanding_extents
>=
5072 BTRFS_I(inode
)->reserved_extents
)
5073 return drop_inode_space
;
5075 dropped_extents
= BTRFS_I(inode
)->reserved_extents
-
5076 BTRFS_I(inode
)->outstanding_extents
;
5077 BTRFS_I(inode
)->reserved_extents
-= dropped_extents
;
5078 return dropped_extents
+ drop_inode_space
;
5082 * calc_csum_metadata_size - return the amount of metada space that must be
5083 * reserved/free'd for the given bytes.
5084 * @inode: the inode we're manipulating
5085 * @num_bytes: the number of bytes in question
5086 * @reserve: 1 if we are reserving space, 0 if we are freeing space
5088 * This adjusts the number of csum_bytes in the inode and then returns the
5089 * correct amount of metadata that must either be reserved or freed. We
5090 * calculate how many checksums we can fit into one leaf and then divide the
5091 * number of bytes that will need to be checksumed by this value to figure out
5092 * how many checksums will be required. If we are adding bytes then the number
5093 * may go up and we will return the number of additional bytes that must be
5094 * reserved. If it is going down we will return the number of bytes that must
5097 * This must be called with BTRFS_I(inode)->lock held.
5099 static u64
calc_csum_metadata_size(struct inode
*inode
, u64 num_bytes
,
5102 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5104 int num_csums_per_leaf
;
5108 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
&&
5109 BTRFS_I(inode
)->csum_bytes
== 0)
5112 old_csums
= (int)div64_u64(BTRFS_I(inode
)->csum_bytes
, root
->sectorsize
);
5114 BTRFS_I(inode
)->csum_bytes
+= num_bytes
;
5116 BTRFS_I(inode
)->csum_bytes
-= num_bytes
;
5117 csum_size
= BTRFS_LEAF_DATA_SIZE(root
) - sizeof(struct btrfs_item
);
5118 num_csums_per_leaf
= (int)div64_u64(csum_size
,
5119 sizeof(struct btrfs_csum_item
) +
5120 sizeof(struct btrfs_disk_key
));
5121 num_csums
= (int)div64_u64(BTRFS_I(inode
)->csum_bytes
, root
->sectorsize
);
5122 num_csums
= num_csums
+ num_csums_per_leaf
- 1;
5123 num_csums
= num_csums
/ num_csums_per_leaf
;
5125 old_csums
= old_csums
+ num_csums_per_leaf
- 1;
5126 old_csums
= old_csums
/ num_csums_per_leaf
;
5128 /* No change, no need to reserve more */
5129 if (old_csums
== num_csums
)
5133 return btrfs_calc_trans_metadata_size(root
,
5134 num_csums
- old_csums
);
5136 return btrfs_calc_trans_metadata_size(root
, old_csums
- num_csums
);
5139 int btrfs_delalloc_reserve_metadata(struct inode
*inode
, u64 num_bytes
)
5141 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5142 struct btrfs_block_rsv
*block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
5145 unsigned nr_extents
= 0;
5146 int extra_reserve
= 0;
5147 enum btrfs_reserve_flush_enum flush
= BTRFS_RESERVE_FLUSH_ALL
;
5149 bool delalloc_lock
= true;
5153 /* If we are a free space inode we need to not flush since we will be in
5154 * the middle of a transaction commit. We also don't need the delalloc
5155 * mutex since we won't race with anybody. We need this mostly to make
5156 * lockdep shut its filthy mouth.
5158 if (btrfs_is_free_space_inode(inode
)) {
5159 flush
= BTRFS_RESERVE_NO_FLUSH
;
5160 delalloc_lock
= false;
5163 if (flush
!= BTRFS_RESERVE_NO_FLUSH
&&
5164 btrfs_transaction_in_commit(root
->fs_info
))
5165 schedule_timeout(1);
5168 mutex_lock(&BTRFS_I(inode
)->delalloc_mutex
);
5170 num_bytes
= ALIGN(num_bytes
, root
->sectorsize
);
5172 spin_lock(&BTRFS_I(inode
)->lock
);
5173 BTRFS_I(inode
)->outstanding_extents
++;
5175 if (BTRFS_I(inode
)->outstanding_extents
>
5176 BTRFS_I(inode
)->reserved_extents
)
5177 nr_extents
= BTRFS_I(inode
)->outstanding_extents
-
5178 BTRFS_I(inode
)->reserved_extents
;
5181 * Add an item to reserve for updating the inode when we complete the
5184 if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5185 &BTRFS_I(inode
)->runtime_flags
)) {
5190 to_reserve
= btrfs_calc_trans_metadata_size(root
, nr_extents
);
5191 to_reserve
+= calc_csum_metadata_size(inode
, num_bytes
, 1);
5192 csum_bytes
= BTRFS_I(inode
)->csum_bytes
;
5193 spin_unlock(&BTRFS_I(inode
)->lock
);
5195 if (root
->fs_info
->quota_enabled
) {
5196 ret
= btrfs_qgroup_reserve(root
, num_bytes
+
5197 nr_extents
* root
->nodesize
);
5202 ret
= reserve_metadata_bytes(root
, block_rsv
, to_reserve
, flush
);
5203 if (unlikely(ret
)) {
5204 if (root
->fs_info
->quota_enabled
)
5205 btrfs_qgroup_free(root
, num_bytes
+
5206 nr_extents
* root
->nodesize
);
5210 spin_lock(&BTRFS_I(inode
)->lock
);
5211 if (extra_reserve
) {
5212 set_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5213 &BTRFS_I(inode
)->runtime_flags
);
5216 BTRFS_I(inode
)->reserved_extents
+= nr_extents
;
5217 spin_unlock(&BTRFS_I(inode
)->lock
);
5220 mutex_unlock(&BTRFS_I(inode
)->delalloc_mutex
);
5223 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5224 btrfs_ino(inode
), to_reserve
, 1);
5225 block_rsv_add_bytes(block_rsv
, to_reserve
, 1);
5230 spin_lock(&BTRFS_I(inode
)->lock
);
5231 dropped
= drop_outstanding_extent(inode
);
5233 * If the inodes csum_bytes is the same as the original
5234 * csum_bytes then we know we haven't raced with any free()ers
5235 * so we can just reduce our inodes csum bytes and carry on.
5237 if (BTRFS_I(inode
)->csum_bytes
== csum_bytes
) {
5238 calc_csum_metadata_size(inode
, num_bytes
, 0);
5240 u64 orig_csum_bytes
= BTRFS_I(inode
)->csum_bytes
;
5244 * This is tricky, but first we need to figure out how much we
5245 * free'd from any free-ers that occured during this
5246 * reservation, so we reset ->csum_bytes to the csum_bytes
5247 * before we dropped our lock, and then call the free for the
5248 * number of bytes that were freed while we were trying our
5251 bytes
= csum_bytes
- BTRFS_I(inode
)->csum_bytes
;
5252 BTRFS_I(inode
)->csum_bytes
= csum_bytes
;
5253 to_free
= calc_csum_metadata_size(inode
, bytes
, 0);
5257 * Now we need to see how much we would have freed had we not
5258 * been making this reservation and our ->csum_bytes were not
5259 * artificially inflated.
5261 BTRFS_I(inode
)->csum_bytes
= csum_bytes
- num_bytes
;
5262 bytes
= csum_bytes
- orig_csum_bytes
;
5263 bytes
= calc_csum_metadata_size(inode
, bytes
, 0);
5266 * Now reset ->csum_bytes to what it should be. If bytes is
5267 * more than to_free then we would have free'd more space had we
5268 * not had an artificially high ->csum_bytes, so we need to free
5269 * the remainder. If bytes is the same or less then we don't
5270 * need to do anything, the other free-ers did the correct
5273 BTRFS_I(inode
)->csum_bytes
= orig_csum_bytes
- num_bytes
;
5274 if (bytes
> to_free
)
5275 to_free
= bytes
- to_free
;
5279 spin_unlock(&BTRFS_I(inode
)->lock
);
5281 to_free
+= btrfs_calc_trans_metadata_size(root
, dropped
);
5284 btrfs_block_rsv_release(root
, block_rsv
, to_free
);
5285 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5286 btrfs_ino(inode
), to_free
, 0);
5289 mutex_unlock(&BTRFS_I(inode
)->delalloc_mutex
);
5294 * btrfs_delalloc_release_metadata - release a metadata reservation for an inode
5295 * @inode: the inode to release the reservation for
5296 * @num_bytes: the number of bytes we're releasing
5298 * This will release the metadata reservation for an inode. This can be called
5299 * once we complete IO for a given set of bytes to release their metadata
5302 void btrfs_delalloc_release_metadata(struct inode
*inode
, u64 num_bytes
)
5304 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5308 num_bytes
= ALIGN(num_bytes
, root
->sectorsize
);
5309 spin_lock(&BTRFS_I(inode
)->lock
);
5310 dropped
= drop_outstanding_extent(inode
);
5313 to_free
= calc_csum_metadata_size(inode
, num_bytes
, 0);
5314 spin_unlock(&BTRFS_I(inode
)->lock
);
5316 to_free
+= btrfs_calc_trans_metadata_size(root
, dropped
);
5318 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5319 btrfs_ino(inode
), to_free
, 0);
5320 if (root
->fs_info
->quota_enabled
) {
5321 btrfs_qgroup_free(root
, num_bytes
+
5322 dropped
* root
->nodesize
);
5325 btrfs_block_rsv_release(root
, &root
->fs_info
->delalloc_block_rsv
,
5330 * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc
5331 * @inode: inode we're writing to
5332 * @num_bytes: the number of bytes we want to allocate
5334 * This will do the following things
5336 * o reserve space in the data space info for num_bytes
5337 * o reserve space in the metadata space info based on number of outstanding
5338 * extents and how much csums will be needed
5339 * o add to the inodes ->delalloc_bytes
5340 * o add it to the fs_info's delalloc inodes list.
5342 * This will return 0 for success and -ENOSPC if there is no space left.
5344 int btrfs_delalloc_reserve_space(struct inode
*inode
, u64 num_bytes
)
5348 ret
= btrfs_check_data_free_space(inode
, num_bytes
);
5352 ret
= btrfs_delalloc_reserve_metadata(inode
, num_bytes
);
5354 btrfs_free_reserved_data_space(inode
, num_bytes
);
5362 * btrfs_delalloc_release_space - release data and metadata space for delalloc
5363 * @inode: inode we're releasing space for
5364 * @num_bytes: the number of bytes we want to free up
5366 * This must be matched with a call to btrfs_delalloc_reserve_space. This is
5367 * called in the case that we don't need the metadata AND data reservations
5368 * anymore. So if there is an error or we insert an inline extent.
5370 * This function will release the metadata space that was not used and will
5371 * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes
5372 * list if there are no delalloc bytes left.
5374 void btrfs_delalloc_release_space(struct inode
*inode
, u64 num_bytes
)
5376 btrfs_delalloc_release_metadata(inode
, num_bytes
);
5377 btrfs_free_reserved_data_space(inode
, num_bytes
);
5380 static int update_block_group(struct btrfs_root
*root
,
5381 u64 bytenr
, u64 num_bytes
, int alloc
)
5383 struct btrfs_block_group_cache
*cache
= NULL
;
5384 struct btrfs_fs_info
*info
= root
->fs_info
;
5385 u64 total
= num_bytes
;
5390 /* block accounting for super block */
5391 spin_lock(&info
->delalloc_root_lock
);
5392 old_val
= btrfs_super_bytes_used(info
->super_copy
);
5394 old_val
+= num_bytes
;
5396 old_val
-= num_bytes
;
5397 btrfs_set_super_bytes_used(info
->super_copy
, old_val
);
5398 spin_unlock(&info
->delalloc_root_lock
);
5401 cache
= btrfs_lookup_block_group(info
, bytenr
);
5404 if (cache
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
5405 BTRFS_BLOCK_GROUP_RAID1
|
5406 BTRFS_BLOCK_GROUP_RAID10
))
5411 * If this block group has free space cache written out, we
5412 * need to make sure to load it if we are removing space. This
5413 * is because we need the unpinning stage to actually add the
5414 * space back to the block group, otherwise we will leak space.
5416 if (!alloc
&& cache
->cached
== BTRFS_CACHE_NO
)
5417 cache_block_group(cache
, 1);
5419 byte_in_group
= bytenr
- cache
->key
.objectid
;
5420 WARN_ON(byte_in_group
> cache
->key
.offset
);
5422 spin_lock(&cache
->space_info
->lock
);
5423 spin_lock(&cache
->lock
);
5425 if (btrfs_test_opt(root
, SPACE_CACHE
) &&
5426 cache
->disk_cache_state
< BTRFS_DC_CLEAR
)
5427 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
5430 old_val
= btrfs_block_group_used(&cache
->item
);
5431 num_bytes
= min(total
, cache
->key
.offset
- byte_in_group
);
5433 old_val
+= num_bytes
;
5434 btrfs_set_block_group_used(&cache
->item
, old_val
);
5435 cache
->reserved
-= num_bytes
;
5436 cache
->space_info
->bytes_reserved
-= num_bytes
;
5437 cache
->space_info
->bytes_used
+= num_bytes
;
5438 cache
->space_info
->disk_used
+= num_bytes
* factor
;
5439 spin_unlock(&cache
->lock
);
5440 spin_unlock(&cache
->space_info
->lock
);
5442 old_val
-= num_bytes
;
5445 * No longer have used bytes in this block group, queue
5449 spin_lock(&info
->unused_bgs_lock
);
5450 if (list_empty(&cache
->bg_list
)) {
5451 btrfs_get_block_group(cache
);
5452 list_add_tail(&cache
->bg_list
,
5455 spin_unlock(&info
->unused_bgs_lock
);
5457 btrfs_set_block_group_used(&cache
->item
, old_val
);
5458 cache
->pinned
+= num_bytes
;
5459 cache
->space_info
->bytes_pinned
+= num_bytes
;
5460 cache
->space_info
->bytes_used
-= num_bytes
;
5461 cache
->space_info
->disk_used
-= num_bytes
* factor
;
5462 spin_unlock(&cache
->lock
);
5463 spin_unlock(&cache
->space_info
->lock
);
5465 set_extent_dirty(info
->pinned_extents
,
5466 bytenr
, bytenr
+ num_bytes
- 1,
5467 GFP_NOFS
| __GFP_NOFAIL
);
5469 btrfs_put_block_group(cache
);
5471 bytenr
+= num_bytes
;
5476 static u64
first_logical_byte(struct btrfs_root
*root
, u64 search_start
)
5478 struct btrfs_block_group_cache
*cache
;
5481 spin_lock(&root
->fs_info
->block_group_cache_lock
);
5482 bytenr
= root
->fs_info
->first_logical_byte
;
5483 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
5485 if (bytenr
< (u64
)-1)
5488 cache
= btrfs_lookup_first_block_group(root
->fs_info
, search_start
);
5492 bytenr
= cache
->key
.objectid
;
5493 btrfs_put_block_group(cache
);
5498 static int pin_down_extent(struct btrfs_root
*root
,
5499 struct btrfs_block_group_cache
*cache
,
5500 u64 bytenr
, u64 num_bytes
, int reserved
)
5502 spin_lock(&cache
->space_info
->lock
);
5503 spin_lock(&cache
->lock
);
5504 cache
->pinned
+= num_bytes
;
5505 cache
->space_info
->bytes_pinned
+= num_bytes
;
5507 cache
->reserved
-= num_bytes
;
5508 cache
->space_info
->bytes_reserved
-= num_bytes
;
5510 spin_unlock(&cache
->lock
);
5511 spin_unlock(&cache
->space_info
->lock
);
5513 set_extent_dirty(root
->fs_info
->pinned_extents
, bytenr
,
5514 bytenr
+ num_bytes
- 1, GFP_NOFS
| __GFP_NOFAIL
);
5516 trace_btrfs_reserved_extent_free(root
, bytenr
, num_bytes
);
5521 * this function must be called within transaction
5523 int btrfs_pin_extent(struct btrfs_root
*root
,
5524 u64 bytenr
, u64 num_bytes
, int reserved
)
5526 struct btrfs_block_group_cache
*cache
;
5528 cache
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
5529 BUG_ON(!cache
); /* Logic error */
5531 pin_down_extent(root
, cache
, bytenr
, num_bytes
, reserved
);
5533 btrfs_put_block_group(cache
);
5538 * this function must be called within transaction
5540 int btrfs_pin_extent_for_log_replay(struct btrfs_root
*root
,
5541 u64 bytenr
, u64 num_bytes
)
5543 struct btrfs_block_group_cache
*cache
;
5546 cache
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
5551 * pull in the free space cache (if any) so that our pin
5552 * removes the free space from the cache. We have load_only set
5553 * to one because the slow code to read in the free extents does check
5554 * the pinned extents.
5556 cache_block_group(cache
, 1);
5558 pin_down_extent(root
, cache
, bytenr
, num_bytes
, 0);
5560 /* remove us from the free space cache (if we're there at all) */
5561 ret
= btrfs_remove_free_space(cache
, bytenr
, num_bytes
);
5562 btrfs_put_block_group(cache
);
5566 static int __exclude_logged_extent(struct btrfs_root
*root
, u64 start
, u64 num_bytes
)
5569 struct btrfs_block_group_cache
*block_group
;
5570 struct btrfs_caching_control
*caching_ctl
;
5572 block_group
= btrfs_lookup_block_group(root
->fs_info
, start
);
5576 cache_block_group(block_group
, 0);
5577 caching_ctl
= get_caching_control(block_group
);
5581 BUG_ON(!block_group_cache_done(block_group
));
5582 ret
= btrfs_remove_free_space(block_group
, start
, num_bytes
);
5584 mutex_lock(&caching_ctl
->mutex
);
5586 if (start
>= caching_ctl
->progress
) {
5587 ret
= add_excluded_extent(root
, start
, num_bytes
);
5588 } else if (start
+ num_bytes
<= caching_ctl
->progress
) {
5589 ret
= btrfs_remove_free_space(block_group
,
5592 num_bytes
= caching_ctl
->progress
- start
;
5593 ret
= btrfs_remove_free_space(block_group
,
5598 num_bytes
= (start
+ num_bytes
) -
5599 caching_ctl
->progress
;
5600 start
= caching_ctl
->progress
;
5601 ret
= add_excluded_extent(root
, start
, num_bytes
);
5604 mutex_unlock(&caching_ctl
->mutex
);
5605 put_caching_control(caching_ctl
);
5607 btrfs_put_block_group(block_group
);
5611 int btrfs_exclude_logged_extents(struct btrfs_root
*log
,
5612 struct extent_buffer
*eb
)
5614 struct btrfs_file_extent_item
*item
;
5615 struct btrfs_key key
;
5619 if (!btrfs_fs_incompat(log
->fs_info
, MIXED_GROUPS
))
5622 for (i
= 0; i
< btrfs_header_nritems(eb
); i
++) {
5623 btrfs_item_key_to_cpu(eb
, &key
, i
);
5624 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
5626 item
= btrfs_item_ptr(eb
, i
, struct btrfs_file_extent_item
);
5627 found_type
= btrfs_file_extent_type(eb
, item
);
5628 if (found_type
== BTRFS_FILE_EXTENT_INLINE
)
5630 if (btrfs_file_extent_disk_bytenr(eb
, item
) == 0)
5632 key
.objectid
= btrfs_file_extent_disk_bytenr(eb
, item
);
5633 key
.offset
= btrfs_file_extent_disk_num_bytes(eb
, item
);
5634 __exclude_logged_extent(log
, key
.objectid
, key
.offset
);
5641 * btrfs_update_reserved_bytes - update the block_group and space info counters
5642 * @cache: The cache we are manipulating
5643 * @num_bytes: The number of bytes in question
5644 * @reserve: One of the reservation enums
5645 * @delalloc: The blocks are allocated for the delalloc write
5647 * This is called by the allocator when it reserves space, or by somebody who is
5648 * freeing space that was never actually used on disk. For example if you
5649 * reserve some space for a new leaf in transaction A and before transaction A
5650 * commits you free that leaf, you call this with reserve set to 0 in order to
5651 * clear the reservation.
5653 * Metadata reservations should be called with RESERVE_ALLOC so we do the proper
5654 * ENOSPC accounting. For data we handle the reservation through clearing the
5655 * delalloc bits in the io_tree. We have to do this since we could end up
5656 * allocating less disk space for the amount of data we have reserved in the
5657 * case of compression.
5659 * If this is a reservation and the block group has become read only we cannot
5660 * make the reservation and return -EAGAIN, otherwise this function always
5663 static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache
*cache
,
5664 u64 num_bytes
, int reserve
, int delalloc
)
5666 struct btrfs_space_info
*space_info
= cache
->space_info
;
5669 spin_lock(&space_info
->lock
);
5670 spin_lock(&cache
->lock
);
5671 if (reserve
!= RESERVE_FREE
) {
5675 cache
->reserved
+= num_bytes
;
5676 space_info
->bytes_reserved
+= num_bytes
;
5677 if (reserve
== RESERVE_ALLOC
) {
5678 trace_btrfs_space_reservation(cache
->fs_info
,
5679 "space_info", space_info
->flags
,
5681 space_info
->bytes_may_use
-= num_bytes
;
5685 cache
->delalloc_bytes
+= num_bytes
;
5689 space_info
->bytes_readonly
+= num_bytes
;
5690 cache
->reserved
-= num_bytes
;
5691 space_info
->bytes_reserved
-= num_bytes
;
5694 cache
->delalloc_bytes
-= num_bytes
;
5696 spin_unlock(&cache
->lock
);
5697 spin_unlock(&space_info
->lock
);
5701 void btrfs_prepare_extent_commit(struct btrfs_trans_handle
*trans
,
5702 struct btrfs_root
*root
)
5704 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5705 struct btrfs_caching_control
*next
;
5706 struct btrfs_caching_control
*caching_ctl
;
5707 struct btrfs_block_group_cache
*cache
;
5709 down_write(&fs_info
->commit_root_sem
);
5711 list_for_each_entry_safe(caching_ctl
, next
,
5712 &fs_info
->caching_block_groups
, list
) {
5713 cache
= caching_ctl
->block_group
;
5714 if (block_group_cache_done(cache
)) {
5715 cache
->last_byte_to_unpin
= (u64
)-1;
5716 list_del_init(&caching_ctl
->list
);
5717 put_caching_control(caching_ctl
);
5719 cache
->last_byte_to_unpin
= caching_ctl
->progress
;
5723 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
5724 fs_info
->pinned_extents
= &fs_info
->freed_extents
[1];
5726 fs_info
->pinned_extents
= &fs_info
->freed_extents
[0];
5728 up_write(&fs_info
->commit_root_sem
);
5730 update_global_block_rsv(fs_info
);
5733 static int unpin_extent_range(struct btrfs_root
*root
, u64 start
, u64 end
)
5735 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5736 struct btrfs_block_group_cache
*cache
= NULL
;
5737 struct btrfs_space_info
*space_info
;
5738 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
5742 while (start
<= end
) {
5745 start
>= cache
->key
.objectid
+ cache
->key
.offset
) {
5747 btrfs_put_block_group(cache
);
5748 cache
= btrfs_lookup_block_group(fs_info
, start
);
5749 BUG_ON(!cache
); /* Logic error */
5752 len
= cache
->key
.objectid
+ cache
->key
.offset
- start
;
5753 len
= min(len
, end
+ 1 - start
);
5755 if (start
< cache
->last_byte_to_unpin
) {
5756 len
= min(len
, cache
->last_byte_to_unpin
- start
);
5757 btrfs_add_free_space(cache
, start
, len
);
5761 space_info
= cache
->space_info
;
5763 spin_lock(&space_info
->lock
);
5764 spin_lock(&cache
->lock
);
5765 cache
->pinned
-= len
;
5766 space_info
->bytes_pinned
-= len
;
5767 percpu_counter_add(&space_info
->total_bytes_pinned
, -len
);
5769 space_info
->bytes_readonly
+= len
;
5772 spin_unlock(&cache
->lock
);
5773 if (!readonly
&& global_rsv
->space_info
== space_info
) {
5774 spin_lock(&global_rsv
->lock
);
5775 if (!global_rsv
->full
) {
5776 len
= min(len
, global_rsv
->size
-
5777 global_rsv
->reserved
);
5778 global_rsv
->reserved
+= len
;
5779 space_info
->bytes_may_use
+= len
;
5780 if (global_rsv
->reserved
>= global_rsv
->size
)
5781 global_rsv
->full
= 1;
5783 spin_unlock(&global_rsv
->lock
);
5785 spin_unlock(&space_info
->lock
);
5789 btrfs_put_block_group(cache
);
5793 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
5794 struct btrfs_root
*root
)
5796 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5797 struct extent_io_tree
*unpin
;
5805 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
5806 unpin
= &fs_info
->freed_extents
[1];
5808 unpin
= &fs_info
->freed_extents
[0];
5811 ret
= find_first_extent_bit(unpin
, 0, &start
, &end
,
5812 EXTENT_DIRTY
, NULL
);
5816 if (btrfs_test_opt(root
, DISCARD
))
5817 ret
= btrfs_discard_extent(root
, start
,
5818 end
+ 1 - start
, NULL
);
5820 clear_extent_dirty(unpin
, start
, end
, GFP_NOFS
);
5821 unpin_extent_range(root
, start
, end
);
5828 static void add_pinned_bytes(struct btrfs_fs_info
*fs_info
, u64 num_bytes
,
5829 u64 owner
, u64 root_objectid
)
5831 struct btrfs_space_info
*space_info
;
5834 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
5835 if (root_objectid
== BTRFS_CHUNK_TREE_OBJECTID
)
5836 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
5838 flags
= BTRFS_BLOCK_GROUP_METADATA
;
5840 flags
= BTRFS_BLOCK_GROUP_DATA
;
5843 space_info
= __find_space_info(fs_info
, flags
);
5844 BUG_ON(!space_info
); /* Logic bug */
5845 percpu_counter_add(&space_info
->total_bytes_pinned
, num_bytes
);
5849 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
5850 struct btrfs_root
*root
,
5851 u64 bytenr
, u64 num_bytes
, u64 parent
,
5852 u64 root_objectid
, u64 owner_objectid
,
5853 u64 owner_offset
, int refs_to_drop
,
5854 struct btrfs_delayed_extent_op
*extent_op
,
5857 struct btrfs_key key
;
5858 struct btrfs_path
*path
;
5859 struct btrfs_fs_info
*info
= root
->fs_info
;
5860 struct btrfs_root
*extent_root
= info
->extent_root
;
5861 struct extent_buffer
*leaf
;
5862 struct btrfs_extent_item
*ei
;
5863 struct btrfs_extent_inline_ref
*iref
;
5866 int extent_slot
= 0;
5867 int found_extent
= 0;
5872 enum btrfs_qgroup_operation_type type
= BTRFS_QGROUP_OPER_SUB_EXCL
;
5873 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
5876 if (!info
->quota_enabled
|| !is_fstree(root_objectid
))
5879 path
= btrfs_alloc_path();
5884 path
->leave_spinning
= 1;
5886 is_data
= owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
;
5887 BUG_ON(!is_data
&& refs_to_drop
!= 1);
5890 skinny_metadata
= 0;
5892 ret
= lookup_extent_backref(trans
, extent_root
, path
, &iref
,
5893 bytenr
, num_bytes
, parent
,
5894 root_objectid
, owner_objectid
,
5897 extent_slot
= path
->slots
[0];
5898 while (extent_slot
>= 0) {
5899 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
5901 if (key
.objectid
!= bytenr
)
5903 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
5904 key
.offset
== num_bytes
) {
5908 if (key
.type
== BTRFS_METADATA_ITEM_KEY
&&
5909 key
.offset
== owner_objectid
) {
5913 if (path
->slots
[0] - extent_slot
> 5)
5917 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
5918 item_size
= btrfs_item_size_nr(path
->nodes
[0], extent_slot
);
5919 if (found_extent
&& item_size
< sizeof(*ei
))
5922 if (!found_extent
) {
5924 ret
= remove_extent_backref(trans
, extent_root
, path
,
5926 is_data
, &last_ref
);
5928 btrfs_abort_transaction(trans
, extent_root
, ret
);
5931 btrfs_release_path(path
);
5932 path
->leave_spinning
= 1;
5934 key
.objectid
= bytenr
;
5935 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
5936 key
.offset
= num_bytes
;
5938 if (!is_data
&& skinny_metadata
) {
5939 key
.type
= BTRFS_METADATA_ITEM_KEY
;
5940 key
.offset
= owner_objectid
;
5943 ret
= btrfs_search_slot(trans
, extent_root
,
5945 if (ret
> 0 && skinny_metadata
&& path
->slots
[0]) {
5947 * Couldn't find our skinny metadata item,
5948 * see if we have ye olde extent item.
5951 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
5953 if (key
.objectid
== bytenr
&&
5954 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
5955 key
.offset
== num_bytes
)
5959 if (ret
> 0 && skinny_metadata
) {
5960 skinny_metadata
= false;
5961 key
.objectid
= bytenr
;
5962 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
5963 key
.offset
= num_bytes
;
5964 btrfs_release_path(path
);
5965 ret
= btrfs_search_slot(trans
, extent_root
,
5970 btrfs_err(info
, "umm, got %d back from search, was looking for %llu",
5973 btrfs_print_leaf(extent_root
,
5977 btrfs_abort_transaction(trans
, extent_root
, ret
);
5980 extent_slot
= path
->slots
[0];
5982 } else if (WARN_ON(ret
== -ENOENT
)) {
5983 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
5985 "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu",
5986 bytenr
, parent
, root_objectid
, owner_objectid
,
5988 btrfs_abort_transaction(trans
, extent_root
, ret
);
5991 btrfs_abort_transaction(trans
, extent_root
, ret
);
5995 leaf
= path
->nodes
[0];
5996 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
5997 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
5998 if (item_size
< sizeof(*ei
)) {
5999 BUG_ON(found_extent
|| extent_slot
!= path
->slots
[0]);
6000 ret
= convert_extent_item_v0(trans
, extent_root
, path
,
6003 btrfs_abort_transaction(trans
, extent_root
, ret
);
6007 btrfs_release_path(path
);
6008 path
->leave_spinning
= 1;
6010 key
.objectid
= bytenr
;
6011 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
6012 key
.offset
= num_bytes
;
6014 ret
= btrfs_search_slot(trans
, extent_root
, &key
, path
,
6017 btrfs_err(info
, "umm, got %d back from search, was looking for %llu",
6019 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
6022 btrfs_abort_transaction(trans
, extent_root
, ret
);
6026 extent_slot
= path
->slots
[0];
6027 leaf
= path
->nodes
[0];
6028 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
6031 BUG_ON(item_size
< sizeof(*ei
));
6032 ei
= btrfs_item_ptr(leaf
, extent_slot
,
6033 struct btrfs_extent_item
);
6034 if (owner_objectid
< BTRFS_FIRST_FREE_OBJECTID
&&
6035 key
.type
== BTRFS_EXTENT_ITEM_KEY
) {
6036 struct btrfs_tree_block_info
*bi
;
6037 BUG_ON(item_size
< sizeof(*ei
) + sizeof(*bi
));
6038 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
6039 WARN_ON(owner_objectid
!= btrfs_tree_block_level(leaf
, bi
));
6042 refs
= btrfs_extent_refs(leaf
, ei
);
6043 if (refs
< refs_to_drop
) {
6044 btrfs_err(info
, "trying to drop %d refs but we only have %Lu "
6045 "for bytenr %Lu", refs_to_drop
, refs
, bytenr
);
6047 btrfs_abort_transaction(trans
, extent_root
, ret
);
6050 refs
-= refs_to_drop
;
6053 type
= BTRFS_QGROUP_OPER_SUB_SHARED
;
6055 __run_delayed_extent_op(extent_op
, leaf
, ei
);
6057 * In the case of inline back ref, reference count will
6058 * be updated by remove_extent_backref
6061 BUG_ON(!found_extent
);
6063 btrfs_set_extent_refs(leaf
, ei
, refs
);
6064 btrfs_mark_buffer_dirty(leaf
);
6067 ret
= remove_extent_backref(trans
, extent_root
, path
,
6069 is_data
, &last_ref
);
6071 btrfs_abort_transaction(trans
, extent_root
, ret
);
6075 add_pinned_bytes(root
->fs_info
, -num_bytes
, owner_objectid
,
6079 BUG_ON(is_data
&& refs_to_drop
!=
6080 extent_data_ref_count(root
, path
, iref
));
6082 BUG_ON(path
->slots
[0] != extent_slot
);
6084 BUG_ON(path
->slots
[0] != extent_slot
+ 1);
6085 path
->slots
[0] = extent_slot
;
6091 ret
= btrfs_del_items(trans
, extent_root
, path
, path
->slots
[0],
6094 btrfs_abort_transaction(trans
, extent_root
, ret
);
6097 btrfs_release_path(path
);
6100 ret
= btrfs_del_csums(trans
, root
, bytenr
, num_bytes
);
6102 btrfs_abort_transaction(trans
, extent_root
, ret
);
6107 ret
= update_block_group(root
, bytenr
, num_bytes
, 0);
6109 btrfs_abort_transaction(trans
, extent_root
, ret
);
6113 btrfs_release_path(path
);
6115 /* Deal with the quota accounting */
6116 if (!ret
&& last_ref
&& !no_quota
) {
6119 if (owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
&&
6120 type
== BTRFS_QGROUP_OPER_SUB_SHARED
)
6123 ret
= btrfs_qgroup_record_ref(trans
, info
, root_objectid
,
6124 bytenr
, num_bytes
, type
,
6128 btrfs_free_path(path
);
6133 * when we free an block, it is possible (and likely) that we free the last
6134 * delayed ref for that extent as well. This searches the delayed ref tree for
6135 * a given extent, and if there are no other delayed refs to be processed, it
6136 * removes it from the tree.
6138 static noinline
int check_ref_cleanup(struct btrfs_trans_handle
*trans
,
6139 struct btrfs_root
*root
, u64 bytenr
)
6141 struct btrfs_delayed_ref_head
*head
;
6142 struct btrfs_delayed_ref_root
*delayed_refs
;
6145 delayed_refs
= &trans
->transaction
->delayed_refs
;
6146 spin_lock(&delayed_refs
->lock
);
6147 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
6149 goto out_delayed_unlock
;
6151 spin_lock(&head
->lock
);
6152 if (rb_first(&head
->ref_root
))
6155 if (head
->extent_op
) {
6156 if (!head
->must_insert_reserved
)
6158 btrfs_free_delayed_extent_op(head
->extent_op
);
6159 head
->extent_op
= NULL
;
6163 * waiting for the lock here would deadlock. If someone else has it
6164 * locked they are already in the process of dropping it anyway
6166 if (!mutex_trylock(&head
->mutex
))
6170 * at this point we have a head with no other entries. Go
6171 * ahead and process it.
6173 head
->node
.in_tree
= 0;
6174 rb_erase(&head
->href_node
, &delayed_refs
->href_root
);
6176 atomic_dec(&delayed_refs
->num_entries
);
6179 * we don't take a ref on the node because we're removing it from the
6180 * tree, so we just steal the ref the tree was holding.
6182 delayed_refs
->num_heads
--;
6183 if (head
->processing
== 0)
6184 delayed_refs
->num_heads_ready
--;
6185 head
->processing
= 0;
6186 spin_unlock(&head
->lock
);
6187 spin_unlock(&delayed_refs
->lock
);
6189 BUG_ON(head
->extent_op
);
6190 if (head
->must_insert_reserved
)
6193 mutex_unlock(&head
->mutex
);
6194 btrfs_put_delayed_ref(&head
->node
);
6197 spin_unlock(&head
->lock
);
6200 spin_unlock(&delayed_refs
->lock
);
6204 void btrfs_free_tree_block(struct btrfs_trans_handle
*trans
,
6205 struct btrfs_root
*root
,
6206 struct extent_buffer
*buf
,
6207 u64 parent
, int last_ref
)
6209 struct btrfs_block_group_cache
*cache
= NULL
;
6213 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
6214 ret
= btrfs_add_delayed_tree_ref(root
->fs_info
, trans
,
6215 buf
->start
, buf
->len
,
6216 parent
, root
->root_key
.objectid
,
6217 btrfs_header_level(buf
),
6218 BTRFS_DROP_DELAYED_REF
, NULL
, 0);
6219 BUG_ON(ret
); /* -ENOMEM */
6225 cache
= btrfs_lookup_block_group(root
->fs_info
, buf
->start
);
6227 if (btrfs_header_generation(buf
) == trans
->transid
) {
6228 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
6229 ret
= check_ref_cleanup(trans
, root
, buf
->start
);
6234 if (btrfs_header_flag(buf
, BTRFS_HEADER_FLAG_WRITTEN
)) {
6235 pin_down_extent(root
, cache
, buf
->start
, buf
->len
, 1);
6239 WARN_ON(test_bit(EXTENT_BUFFER_DIRTY
, &buf
->bflags
));
6241 btrfs_add_free_space(cache
, buf
->start
, buf
->len
);
6242 btrfs_update_reserved_bytes(cache
, buf
->len
, RESERVE_FREE
, 0);
6243 trace_btrfs_reserved_extent_free(root
, buf
->start
, buf
->len
);
6248 add_pinned_bytes(root
->fs_info
, buf
->len
,
6249 btrfs_header_level(buf
),
6250 root
->root_key
.objectid
);
6253 * Deleting the buffer, clear the corrupt flag since it doesn't matter
6256 clear_bit(EXTENT_BUFFER_CORRUPT
, &buf
->bflags
);
6257 btrfs_put_block_group(cache
);
6260 /* Can return -ENOMEM */
6261 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
6262 u64 bytenr
, u64 num_bytes
, u64 parent
, u64 root_objectid
,
6263 u64 owner
, u64 offset
, int no_quota
)
6266 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
6268 if (btrfs_test_is_dummy_root(root
))
6271 add_pinned_bytes(root
->fs_info
, num_bytes
, owner
, root_objectid
);
6274 * tree log blocks never actually go into the extent allocation
6275 * tree, just update pinning info and exit early.
6277 if (root_objectid
== BTRFS_TREE_LOG_OBJECTID
) {
6278 WARN_ON(owner
>= BTRFS_FIRST_FREE_OBJECTID
);
6279 /* unlocks the pinned mutex */
6280 btrfs_pin_extent(root
, bytenr
, num_bytes
, 1);
6282 } else if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
6283 ret
= btrfs_add_delayed_tree_ref(fs_info
, trans
, bytenr
,
6285 parent
, root_objectid
, (int)owner
,
6286 BTRFS_DROP_DELAYED_REF
, NULL
, no_quota
);
6288 ret
= btrfs_add_delayed_data_ref(fs_info
, trans
, bytenr
,
6290 parent
, root_objectid
, owner
,
6291 offset
, BTRFS_DROP_DELAYED_REF
,
6298 * when we wait for progress in the block group caching, its because
6299 * our allocation attempt failed at least once. So, we must sleep
6300 * and let some progress happen before we try again.
6302 * This function will sleep at least once waiting for new free space to
6303 * show up, and then it will check the block group free space numbers
6304 * for our min num_bytes. Another option is to have it go ahead
6305 * and look in the rbtree for a free extent of a given size, but this
6308 * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using
6309 * any of the information in this block group.
6311 static noinline
void
6312 wait_block_group_cache_progress(struct btrfs_block_group_cache
*cache
,
6315 struct btrfs_caching_control
*caching_ctl
;
6317 caching_ctl
= get_caching_control(cache
);
6321 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
) ||
6322 (cache
->free_space_ctl
->free_space
>= num_bytes
));
6324 put_caching_control(caching_ctl
);
6328 wait_block_group_cache_done(struct btrfs_block_group_cache
*cache
)
6330 struct btrfs_caching_control
*caching_ctl
;
6333 caching_ctl
= get_caching_control(cache
);
6335 return (cache
->cached
== BTRFS_CACHE_ERROR
) ? -EIO
: 0;
6337 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
));
6338 if (cache
->cached
== BTRFS_CACHE_ERROR
)
6340 put_caching_control(caching_ctl
);
6344 int __get_raid_index(u64 flags
)
6346 if (flags
& BTRFS_BLOCK_GROUP_RAID10
)
6347 return BTRFS_RAID_RAID10
;
6348 else if (flags
& BTRFS_BLOCK_GROUP_RAID1
)
6349 return BTRFS_RAID_RAID1
;
6350 else if (flags
& BTRFS_BLOCK_GROUP_DUP
)
6351 return BTRFS_RAID_DUP
;
6352 else if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
6353 return BTRFS_RAID_RAID0
;
6354 else if (flags
& BTRFS_BLOCK_GROUP_RAID5
)
6355 return BTRFS_RAID_RAID5
;
6356 else if (flags
& BTRFS_BLOCK_GROUP_RAID6
)
6357 return BTRFS_RAID_RAID6
;
6359 return BTRFS_RAID_SINGLE
; /* BTRFS_BLOCK_GROUP_SINGLE */
6362 int get_block_group_index(struct btrfs_block_group_cache
*cache
)
6364 return __get_raid_index(cache
->flags
);
6367 static const char *btrfs_raid_type_names
[BTRFS_NR_RAID_TYPES
] = {
6368 [BTRFS_RAID_RAID10
] = "raid10",
6369 [BTRFS_RAID_RAID1
] = "raid1",
6370 [BTRFS_RAID_DUP
] = "dup",
6371 [BTRFS_RAID_RAID0
] = "raid0",
6372 [BTRFS_RAID_SINGLE
] = "single",
6373 [BTRFS_RAID_RAID5
] = "raid5",
6374 [BTRFS_RAID_RAID6
] = "raid6",
6377 static const char *get_raid_name(enum btrfs_raid_types type
)
6379 if (type
>= BTRFS_NR_RAID_TYPES
)
6382 return btrfs_raid_type_names
[type
];
6385 enum btrfs_loop_type
{
6386 LOOP_CACHING_NOWAIT
= 0,
6387 LOOP_CACHING_WAIT
= 1,
6388 LOOP_ALLOC_CHUNK
= 2,
6389 LOOP_NO_EMPTY_SIZE
= 3,
6393 btrfs_lock_block_group(struct btrfs_block_group_cache
*cache
,
6397 down_read(&cache
->data_rwsem
);
6401 btrfs_grab_block_group(struct btrfs_block_group_cache
*cache
,
6404 btrfs_get_block_group(cache
);
6406 down_read(&cache
->data_rwsem
);
6409 static struct btrfs_block_group_cache
*
6410 btrfs_lock_cluster(struct btrfs_block_group_cache
*block_group
,
6411 struct btrfs_free_cluster
*cluster
,
6414 struct btrfs_block_group_cache
*used_bg
;
6415 bool locked
= false;
6417 spin_lock(&cluster
->refill_lock
);
6419 if (used_bg
== cluster
->block_group
)
6422 up_read(&used_bg
->data_rwsem
);
6423 btrfs_put_block_group(used_bg
);
6426 used_bg
= cluster
->block_group
;
6430 if (used_bg
== block_group
)
6433 btrfs_get_block_group(used_bg
);
6438 if (down_read_trylock(&used_bg
->data_rwsem
))
6441 spin_unlock(&cluster
->refill_lock
);
6442 down_read(&used_bg
->data_rwsem
);
6448 btrfs_release_block_group(struct btrfs_block_group_cache
*cache
,
6452 up_read(&cache
->data_rwsem
);
6453 btrfs_put_block_group(cache
);
6457 * walks the btree of allocated extents and find a hole of a given size.
6458 * The key ins is changed to record the hole:
6459 * ins->objectid == start position
6460 * ins->flags = BTRFS_EXTENT_ITEM_KEY
6461 * ins->offset == the size of the hole.
6462 * Any available blocks before search_start are skipped.
6464 * If there is no suitable free space, we will record the max size of
6465 * the free space extent currently.
6467 static noinline
int find_free_extent(struct btrfs_root
*orig_root
,
6468 u64 num_bytes
, u64 empty_size
,
6469 u64 hint_byte
, struct btrfs_key
*ins
,
6470 u64 flags
, int delalloc
)
6473 struct btrfs_root
*root
= orig_root
->fs_info
->extent_root
;
6474 struct btrfs_free_cluster
*last_ptr
= NULL
;
6475 struct btrfs_block_group_cache
*block_group
= NULL
;
6476 u64 search_start
= 0;
6477 u64 max_extent_size
= 0;
6478 int empty_cluster
= 2 * 1024 * 1024;
6479 struct btrfs_space_info
*space_info
;
6481 int index
= __get_raid_index(flags
);
6482 int alloc_type
= (flags
& BTRFS_BLOCK_GROUP_DATA
) ?
6483 RESERVE_ALLOC_NO_ACCOUNT
: RESERVE_ALLOC
;
6484 bool failed_cluster_refill
= false;
6485 bool failed_alloc
= false;
6486 bool use_cluster
= true;
6487 bool have_caching_bg
= false;
6489 WARN_ON(num_bytes
< root
->sectorsize
);
6490 ins
->type
= BTRFS_EXTENT_ITEM_KEY
;
6494 trace_find_free_extent(orig_root
, num_bytes
, empty_size
, flags
);
6496 space_info
= __find_space_info(root
->fs_info
, flags
);
6498 btrfs_err(root
->fs_info
, "No space info for %llu", flags
);
6503 * If the space info is for both data and metadata it means we have a
6504 * small filesystem and we can't use the clustering stuff.
6506 if (btrfs_mixed_space_info(space_info
))
6507 use_cluster
= false;
6509 if (flags
& BTRFS_BLOCK_GROUP_METADATA
&& use_cluster
) {
6510 last_ptr
= &root
->fs_info
->meta_alloc_cluster
;
6511 if (!btrfs_test_opt(root
, SSD
))
6512 empty_cluster
= 64 * 1024;
6515 if ((flags
& BTRFS_BLOCK_GROUP_DATA
) && use_cluster
&&
6516 btrfs_test_opt(root
, SSD
)) {
6517 last_ptr
= &root
->fs_info
->data_alloc_cluster
;
6521 spin_lock(&last_ptr
->lock
);
6522 if (last_ptr
->block_group
)
6523 hint_byte
= last_ptr
->window_start
;
6524 spin_unlock(&last_ptr
->lock
);
6527 search_start
= max(search_start
, first_logical_byte(root
, 0));
6528 search_start
= max(search_start
, hint_byte
);
6533 if (search_start
== hint_byte
) {
6534 block_group
= btrfs_lookup_block_group(root
->fs_info
,
6537 * we don't want to use the block group if it doesn't match our
6538 * allocation bits, or if its not cached.
6540 * However if we are re-searching with an ideal block group
6541 * picked out then we don't care that the block group is cached.
6543 if (block_group
&& block_group_bits(block_group
, flags
) &&
6544 block_group
->cached
!= BTRFS_CACHE_NO
) {
6545 down_read(&space_info
->groups_sem
);
6546 if (list_empty(&block_group
->list
) ||
6549 * someone is removing this block group,
6550 * we can't jump into the have_block_group
6551 * target because our list pointers are not
6554 btrfs_put_block_group(block_group
);
6555 up_read(&space_info
->groups_sem
);
6557 index
= get_block_group_index(block_group
);
6558 btrfs_lock_block_group(block_group
, delalloc
);
6559 goto have_block_group
;
6561 } else if (block_group
) {
6562 btrfs_put_block_group(block_group
);
6566 have_caching_bg
= false;
6567 down_read(&space_info
->groups_sem
);
6568 list_for_each_entry(block_group
, &space_info
->block_groups
[index
],
6573 btrfs_grab_block_group(block_group
, delalloc
);
6574 search_start
= block_group
->key
.objectid
;
6577 * this can happen if we end up cycling through all the
6578 * raid types, but we want to make sure we only allocate
6579 * for the proper type.
6581 if (!block_group_bits(block_group
, flags
)) {
6582 u64 extra
= BTRFS_BLOCK_GROUP_DUP
|
6583 BTRFS_BLOCK_GROUP_RAID1
|
6584 BTRFS_BLOCK_GROUP_RAID5
|
6585 BTRFS_BLOCK_GROUP_RAID6
|
6586 BTRFS_BLOCK_GROUP_RAID10
;
6589 * if they asked for extra copies and this block group
6590 * doesn't provide them, bail. This does allow us to
6591 * fill raid0 from raid1.
6593 if ((flags
& extra
) && !(block_group
->flags
& extra
))
6598 cached
= block_group_cache_done(block_group
);
6599 if (unlikely(!cached
)) {
6600 ret
= cache_block_group(block_group
, 0);
6605 if (unlikely(block_group
->cached
== BTRFS_CACHE_ERROR
))
6607 if (unlikely(block_group
->ro
))
6611 * Ok we want to try and use the cluster allocator, so
6615 struct btrfs_block_group_cache
*used_block_group
;
6616 unsigned long aligned_cluster
;
6618 * the refill lock keeps out other
6619 * people trying to start a new cluster
6621 used_block_group
= btrfs_lock_cluster(block_group
,
6624 if (!used_block_group
)
6625 goto refill_cluster
;
6627 if (used_block_group
!= block_group
&&
6628 (used_block_group
->ro
||
6629 !block_group_bits(used_block_group
, flags
)))
6630 goto release_cluster
;
6632 offset
= btrfs_alloc_from_cluster(used_block_group
,
6635 used_block_group
->key
.objectid
,
6638 /* we have a block, we're done */
6639 spin_unlock(&last_ptr
->refill_lock
);
6640 trace_btrfs_reserve_extent_cluster(root
,
6642 search_start
, num_bytes
);
6643 if (used_block_group
!= block_group
) {
6644 btrfs_release_block_group(block_group
,
6646 block_group
= used_block_group
;
6651 WARN_ON(last_ptr
->block_group
!= used_block_group
);
6653 /* If we are on LOOP_NO_EMPTY_SIZE, we can't
6654 * set up a new clusters, so lets just skip it
6655 * and let the allocator find whatever block
6656 * it can find. If we reach this point, we
6657 * will have tried the cluster allocator
6658 * plenty of times and not have found
6659 * anything, so we are likely way too
6660 * fragmented for the clustering stuff to find
6663 * However, if the cluster is taken from the
6664 * current block group, release the cluster
6665 * first, so that we stand a better chance of
6666 * succeeding in the unclustered
6668 if (loop
>= LOOP_NO_EMPTY_SIZE
&&
6669 used_block_group
!= block_group
) {
6670 spin_unlock(&last_ptr
->refill_lock
);
6671 btrfs_release_block_group(used_block_group
,
6673 goto unclustered_alloc
;
6677 * this cluster didn't work out, free it and
6680 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
6682 if (used_block_group
!= block_group
)
6683 btrfs_release_block_group(used_block_group
,
6686 if (loop
>= LOOP_NO_EMPTY_SIZE
) {
6687 spin_unlock(&last_ptr
->refill_lock
);
6688 goto unclustered_alloc
;
6691 aligned_cluster
= max_t(unsigned long,
6692 empty_cluster
+ empty_size
,
6693 block_group
->full_stripe_len
);
6695 /* allocate a cluster in this block group */
6696 ret
= btrfs_find_space_cluster(root
, block_group
,
6697 last_ptr
, search_start
,
6702 * now pull our allocation out of this
6705 offset
= btrfs_alloc_from_cluster(block_group
,
6711 /* we found one, proceed */
6712 spin_unlock(&last_ptr
->refill_lock
);
6713 trace_btrfs_reserve_extent_cluster(root
,
6714 block_group
, search_start
,
6718 } else if (!cached
&& loop
> LOOP_CACHING_NOWAIT
6719 && !failed_cluster_refill
) {
6720 spin_unlock(&last_ptr
->refill_lock
);
6722 failed_cluster_refill
= true;
6723 wait_block_group_cache_progress(block_group
,
6724 num_bytes
+ empty_cluster
+ empty_size
);
6725 goto have_block_group
;
6729 * at this point we either didn't find a cluster
6730 * or we weren't able to allocate a block from our
6731 * cluster. Free the cluster we've been trying
6732 * to use, and go to the next block group
6734 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
6735 spin_unlock(&last_ptr
->refill_lock
);
6740 spin_lock(&block_group
->free_space_ctl
->tree_lock
);
6742 block_group
->free_space_ctl
->free_space
<
6743 num_bytes
+ empty_cluster
+ empty_size
) {
6744 if (block_group
->free_space_ctl
->free_space
>
6747 block_group
->free_space_ctl
->free_space
;
6748 spin_unlock(&block_group
->free_space_ctl
->tree_lock
);
6751 spin_unlock(&block_group
->free_space_ctl
->tree_lock
);
6753 offset
= btrfs_find_space_for_alloc(block_group
, search_start
,
6754 num_bytes
, empty_size
,
6757 * If we didn't find a chunk, and we haven't failed on this
6758 * block group before, and this block group is in the middle of
6759 * caching and we are ok with waiting, then go ahead and wait
6760 * for progress to be made, and set failed_alloc to true.
6762 * If failed_alloc is true then we've already waited on this
6763 * block group once and should move on to the next block group.
6765 if (!offset
&& !failed_alloc
&& !cached
&&
6766 loop
> LOOP_CACHING_NOWAIT
) {
6767 wait_block_group_cache_progress(block_group
,
6768 num_bytes
+ empty_size
);
6769 failed_alloc
= true;
6770 goto have_block_group
;
6771 } else if (!offset
) {
6773 have_caching_bg
= true;
6777 search_start
= ALIGN(offset
, root
->stripesize
);
6779 /* move on to the next group */
6780 if (search_start
+ num_bytes
>
6781 block_group
->key
.objectid
+ block_group
->key
.offset
) {
6782 btrfs_add_free_space(block_group
, offset
, num_bytes
);
6786 if (offset
< search_start
)
6787 btrfs_add_free_space(block_group
, offset
,
6788 search_start
- offset
);
6789 BUG_ON(offset
> search_start
);
6791 ret
= btrfs_update_reserved_bytes(block_group
, num_bytes
,
6792 alloc_type
, delalloc
);
6793 if (ret
== -EAGAIN
) {
6794 btrfs_add_free_space(block_group
, offset
, num_bytes
);
6798 /* we are all good, lets return */
6799 ins
->objectid
= search_start
;
6800 ins
->offset
= num_bytes
;
6802 trace_btrfs_reserve_extent(orig_root
, block_group
,
6803 search_start
, num_bytes
);
6804 btrfs_release_block_group(block_group
, delalloc
);
6807 failed_cluster_refill
= false;
6808 failed_alloc
= false;
6809 BUG_ON(index
!= get_block_group_index(block_group
));
6810 btrfs_release_block_group(block_group
, delalloc
);
6812 up_read(&space_info
->groups_sem
);
6814 if (!ins
->objectid
&& loop
>= LOOP_CACHING_WAIT
&& have_caching_bg
)
6817 if (!ins
->objectid
&& ++index
< BTRFS_NR_RAID_TYPES
)
6821 * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking
6822 * caching kthreads as we move along
6823 * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching
6824 * LOOP_ALLOC_CHUNK, force a chunk allocation and try again
6825 * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
6828 if (!ins
->objectid
&& loop
< LOOP_NO_EMPTY_SIZE
) {
6831 if (loop
== LOOP_ALLOC_CHUNK
) {
6832 struct btrfs_trans_handle
*trans
;
6835 trans
= current
->journal_info
;
6839 trans
= btrfs_join_transaction(root
);
6841 if (IS_ERR(trans
)) {
6842 ret
= PTR_ERR(trans
);
6846 ret
= do_chunk_alloc(trans
, root
, flags
,
6849 * Do not bail out on ENOSPC since we
6850 * can do more things.
6852 if (ret
< 0 && ret
!= -ENOSPC
)
6853 btrfs_abort_transaction(trans
,
6858 btrfs_end_transaction(trans
, root
);
6863 if (loop
== LOOP_NO_EMPTY_SIZE
) {
6869 } else if (!ins
->objectid
) {
6871 } else if (ins
->objectid
) {
6876 ins
->offset
= max_extent_size
;
6880 static void dump_space_info(struct btrfs_space_info
*info
, u64 bytes
,
6881 int dump_block_groups
)
6883 struct btrfs_block_group_cache
*cache
;
6886 spin_lock(&info
->lock
);
6887 printk(KERN_INFO
"BTRFS: space_info %llu has %llu free, is %sfull\n",
6889 info
->total_bytes
- info
->bytes_used
- info
->bytes_pinned
-
6890 info
->bytes_reserved
- info
->bytes_readonly
,
6891 (info
->full
) ? "" : "not ");
6892 printk(KERN_INFO
"BTRFS: space_info total=%llu, used=%llu, pinned=%llu, "
6893 "reserved=%llu, may_use=%llu, readonly=%llu\n",
6894 info
->total_bytes
, info
->bytes_used
, info
->bytes_pinned
,
6895 info
->bytes_reserved
, info
->bytes_may_use
,
6896 info
->bytes_readonly
);
6897 spin_unlock(&info
->lock
);
6899 if (!dump_block_groups
)
6902 down_read(&info
->groups_sem
);
6904 list_for_each_entry(cache
, &info
->block_groups
[index
], list
) {
6905 spin_lock(&cache
->lock
);
6906 printk(KERN_INFO
"BTRFS: "
6907 "block group %llu has %llu bytes, "
6908 "%llu used %llu pinned %llu reserved %s\n",
6909 cache
->key
.objectid
, cache
->key
.offset
,
6910 btrfs_block_group_used(&cache
->item
), cache
->pinned
,
6911 cache
->reserved
, cache
->ro
? "[readonly]" : "");
6912 btrfs_dump_free_space(cache
, bytes
);
6913 spin_unlock(&cache
->lock
);
6915 if (++index
< BTRFS_NR_RAID_TYPES
)
6917 up_read(&info
->groups_sem
);
6920 int btrfs_reserve_extent(struct btrfs_root
*root
,
6921 u64 num_bytes
, u64 min_alloc_size
,
6922 u64 empty_size
, u64 hint_byte
,
6923 struct btrfs_key
*ins
, int is_data
, int delalloc
)
6925 bool final_tried
= false;
6929 flags
= btrfs_get_alloc_profile(root
, is_data
);
6931 WARN_ON(num_bytes
< root
->sectorsize
);
6932 ret
= find_free_extent(root
, num_bytes
, empty_size
, hint_byte
, ins
,
6935 if (ret
== -ENOSPC
) {
6936 if (!final_tried
&& ins
->offset
) {
6937 num_bytes
= min(num_bytes
>> 1, ins
->offset
);
6938 num_bytes
= round_down(num_bytes
, root
->sectorsize
);
6939 num_bytes
= max(num_bytes
, min_alloc_size
);
6940 if (num_bytes
== min_alloc_size
)
6943 } else if (btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
6944 struct btrfs_space_info
*sinfo
;
6946 sinfo
= __find_space_info(root
->fs_info
, flags
);
6947 btrfs_err(root
->fs_info
, "allocation failed flags %llu, wanted %llu",
6950 dump_space_info(sinfo
, num_bytes
, 1);
6957 static int __btrfs_free_reserved_extent(struct btrfs_root
*root
,
6959 int pin
, int delalloc
)
6961 struct btrfs_block_group_cache
*cache
;
6964 cache
= btrfs_lookup_block_group(root
->fs_info
, start
);
6966 btrfs_err(root
->fs_info
, "Unable to find block group for %llu",
6971 if (btrfs_test_opt(root
, DISCARD
))
6972 ret
= btrfs_discard_extent(root
, start
, len
, NULL
);
6975 pin_down_extent(root
, cache
, start
, len
, 1);
6977 btrfs_add_free_space(cache
, start
, len
);
6978 btrfs_update_reserved_bytes(cache
, len
, RESERVE_FREE
, delalloc
);
6980 btrfs_put_block_group(cache
);
6982 trace_btrfs_reserved_extent_free(root
, start
, len
);
6987 int btrfs_free_reserved_extent(struct btrfs_root
*root
,
6988 u64 start
, u64 len
, int delalloc
)
6990 return __btrfs_free_reserved_extent(root
, start
, len
, 0, delalloc
);
6993 int btrfs_free_and_pin_reserved_extent(struct btrfs_root
*root
,
6996 return __btrfs_free_reserved_extent(root
, start
, len
, 1, 0);
6999 static int alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
7000 struct btrfs_root
*root
,
7001 u64 parent
, u64 root_objectid
,
7002 u64 flags
, u64 owner
, u64 offset
,
7003 struct btrfs_key
*ins
, int ref_mod
)
7006 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
7007 struct btrfs_extent_item
*extent_item
;
7008 struct btrfs_extent_inline_ref
*iref
;
7009 struct btrfs_path
*path
;
7010 struct extent_buffer
*leaf
;
7015 type
= BTRFS_SHARED_DATA_REF_KEY
;
7017 type
= BTRFS_EXTENT_DATA_REF_KEY
;
7019 size
= sizeof(*extent_item
) + btrfs_extent_inline_ref_size(type
);
7021 path
= btrfs_alloc_path();
7025 path
->leave_spinning
= 1;
7026 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
7029 btrfs_free_path(path
);
7033 leaf
= path
->nodes
[0];
7034 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
7035 struct btrfs_extent_item
);
7036 btrfs_set_extent_refs(leaf
, extent_item
, ref_mod
);
7037 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
7038 btrfs_set_extent_flags(leaf
, extent_item
,
7039 flags
| BTRFS_EXTENT_FLAG_DATA
);
7041 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
7042 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
7044 struct btrfs_shared_data_ref
*ref
;
7045 ref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
7046 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
7047 btrfs_set_shared_data_ref_count(leaf
, ref
, ref_mod
);
7049 struct btrfs_extent_data_ref
*ref
;
7050 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
7051 btrfs_set_extent_data_ref_root(leaf
, ref
, root_objectid
);
7052 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
7053 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
7054 btrfs_set_extent_data_ref_count(leaf
, ref
, ref_mod
);
7057 btrfs_mark_buffer_dirty(path
->nodes
[0]);
7058 btrfs_free_path(path
);
7060 /* Always set parent to 0 here since its exclusive anyway. */
7061 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
7062 ins
->objectid
, ins
->offset
,
7063 BTRFS_QGROUP_OPER_ADD_EXCL
, 0);
7067 ret
= update_block_group(root
, ins
->objectid
, ins
->offset
, 1);
7068 if (ret
) { /* -ENOENT, logic error */
7069 btrfs_err(fs_info
, "update block group failed for %llu %llu",
7070 ins
->objectid
, ins
->offset
);
7073 trace_btrfs_reserved_extent_alloc(root
, ins
->objectid
, ins
->offset
);
7077 static int alloc_reserved_tree_block(struct btrfs_trans_handle
*trans
,
7078 struct btrfs_root
*root
,
7079 u64 parent
, u64 root_objectid
,
7080 u64 flags
, struct btrfs_disk_key
*key
,
7081 int level
, struct btrfs_key
*ins
,
7085 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
7086 struct btrfs_extent_item
*extent_item
;
7087 struct btrfs_tree_block_info
*block_info
;
7088 struct btrfs_extent_inline_ref
*iref
;
7089 struct btrfs_path
*path
;
7090 struct extent_buffer
*leaf
;
7091 u32 size
= sizeof(*extent_item
) + sizeof(*iref
);
7092 u64 num_bytes
= ins
->offset
;
7093 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
7096 if (!skinny_metadata
)
7097 size
+= sizeof(*block_info
);
7099 path
= btrfs_alloc_path();
7101 btrfs_free_and_pin_reserved_extent(root
, ins
->objectid
,
7106 path
->leave_spinning
= 1;
7107 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
7110 btrfs_free_and_pin_reserved_extent(root
, ins
->objectid
,
7112 btrfs_free_path(path
);
7116 leaf
= path
->nodes
[0];
7117 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
7118 struct btrfs_extent_item
);
7119 btrfs_set_extent_refs(leaf
, extent_item
, 1);
7120 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
7121 btrfs_set_extent_flags(leaf
, extent_item
,
7122 flags
| BTRFS_EXTENT_FLAG_TREE_BLOCK
);
7124 if (skinny_metadata
) {
7125 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
7126 num_bytes
= root
->nodesize
;
7128 block_info
= (struct btrfs_tree_block_info
*)(extent_item
+ 1);
7129 btrfs_set_tree_block_key(leaf
, block_info
, key
);
7130 btrfs_set_tree_block_level(leaf
, block_info
, level
);
7131 iref
= (struct btrfs_extent_inline_ref
*)(block_info
+ 1);
7135 BUG_ON(!(flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
));
7136 btrfs_set_extent_inline_ref_type(leaf
, iref
,
7137 BTRFS_SHARED_BLOCK_REF_KEY
);
7138 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
7140 btrfs_set_extent_inline_ref_type(leaf
, iref
,
7141 BTRFS_TREE_BLOCK_REF_KEY
);
7142 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
7145 btrfs_mark_buffer_dirty(leaf
);
7146 btrfs_free_path(path
);
7149 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
7150 ins
->objectid
, num_bytes
,
7151 BTRFS_QGROUP_OPER_ADD_EXCL
, 0);
7156 ret
= update_block_group(root
, ins
->objectid
, root
->nodesize
, 1);
7157 if (ret
) { /* -ENOENT, logic error */
7158 btrfs_err(fs_info
, "update block group failed for %llu %llu",
7159 ins
->objectid
, ins
->offset
);
7163 trace_btrfs_reserved_extent_alloc(root
, ins
->objectid
, root
->nodesize
);
7167 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
7168 struct btrfs_root
*root
,
7169 u64 root_objectid
, u64 owner
,
7170 u64 offset
, struct btrfs_key
*ins
)
7174 BUG_ON(root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
7176 ret
= btrfs_add_delayed_data_ref(root
->fs_info
, trans
, ins
->objectid
,
7178 root_objectid
, owner
, offset
,
7179 BTRFS_ADD_DELAYED_EXTENT
, NULL
, 0);
7184 * this is used by the tree logging recovery code. It records that
7185 * an extent has been allocated and makes sure to clear the free
7186 * space cache bits as well
7188 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle
*trans
,
7189 struct btrfs_root
*root
,
7190 u64 root_objectid
, u64 owner
, u64 offset
,
7191 struct btrfs_key
*ins
)
7194 struct btrfs_block_group_cache
*block_group
;
7197 * Mixed block groups will exclude before processing the log so we only
7198 * need to do the exlude dance if this fs isn't mixed.
7200 if (!btrfs_fs_incompat(root
->fs_info
, MIXED_GROUPS
)) {
7201 ret
= __exclude_logged_extent(root
, ins
->objectid
, ins
->offset
);
7206 block_group
= btrfs_lookup_block_group(root
->fs_info
, ins
->objectid
);
7210 ret
= btrfs_update_reserved_bytes(block_group
, ins
->offset
,
7211 RESERVE_ALLOC_NO_ACCOUNT
, 0);
7212 BUG_ON(ret
); /* logic error */
7213 ret
= alloc_reserved_file_extent(trans
, root
, 0, root_objectid
,
7214 0, owner
, offset
, ins
, 1);
7215 btrfs_put_block_group(block_group
);
7219 static struct extent_buffer
*
7220 btrfs_init_new_buffer(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
7221 u64 bytenr
, u32 blocksize
, int level
)
7223 struct extent_buffer
*buf
;
7225 buf
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
7227 return ERR_PTR(-ENOMEM
);
7228 btrfs_set_header_generation(buf
, trans
->transid
);
7229 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, buf
, level
);
7230 btrfs_tree_lock(buf
);
7231 clean_tree_block(trans
, root
, buf
);
7232 clear_bit(EXTENT_BUFFER_STALE
, &buf
->bflags
);
7234 btrfs_set_lock_blocking(buf
);
7235 btrfs_set_buffer_uptodate(buf
);
7237 if (root
->root_key
.objectid
== BTRFS_TREE_LOG_OBJECTID
) {
7238 buf
->log_index
= root
->log_transid
% 2;
7240 * we allow two log transactions at a time, use different
7241 * EXENT bit to differentiate dirty pages.
7243 if (buf
->log_index
== 0)
7244 set_extent_dirty(&root
->dirty_log_pages
, buf
->start
,
7245 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7247 set_extent_new(&root
->dirty_log_pages
, buf
->start
,
7248 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7250 buf
->log_index
= -1;
7251 set_extent_dirty(&trans
->transaction
->dirty_pages
, buf
->start
,
7252 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7254 trans
->blocks_used
++;
7255 /* this returns a buffer locked for blocking */
7259 static struct btrfs_block_rsv
*
7260 use_block_rsv(struct btrfs_trans_handle
*trans
,
7261 struct btrfs_root
*root
, u32 blocksize
)
7263 struct btrfs_block_rsv
*block_rsv
;
7264 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
7266 bool global_updated
= false;
7268 block_rsv
= get_block_rsv(trans
, root
);
7270 if (unlikely(block_rsv
->size
== 0))
7273 ret
= block_rsv_use_bytes(block_rsv
, blocksize
);
7277 if (block_rsv
->failfast
)
7278 return ERR_PTR(ret
);
7280 if (block_rsv
->type
== BTRFS_BLOCK_RSV_GLOBAL
&& !global_updated
) {
7281 global_updated
= true;
7282 update_global_block_rsv(root
->fs_info
);
7286 if (btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
7287 static DEFINE_RATELIMIT_STATE(_rs
,
7288 DEFAULT_RATELIMIT_INTERVAL
* 10,
7289 /*DEFAULT_RATELIMIT_BURST*/ 1);
7290 if (__ratelimit(&_rs
))
7292 "BTRFS: block rsv returned %d\n", ret
);
7295 ret
= reserve_metadata_bytes(root
, block_rsv
, blocksize
,
7296 BTRFS_RESERVE_NO_FLUSH
);
7300 * If we couldn't reserve metadata bytes try and use some from
7301 * the global reserve if its space type is the same as the global
7304 if (block_rsv
->type
!= BTRFS_BLOCK_RSV_GLOBAL
&&
7305 block_rsv
->space_info
== global_rsv
->space_info
) {
7306 ret
= block_rsv_use_bytes(global_rsv
, blocksize
);
7310 return ERR_PTR(ret
);
7313 static void unuse_block_rsv(struct btrfs_fs_info
*fs_info
,
7314 struct btrfs_block_rsv
*block_rsv
, u32 blocksize
)
7316 block_rsv_add_bytes(block_rsv
, blocksize
, 0);
7317 block_rsv_release_bytes(fs_info
, block_rsv
, NULL
, 0);
7321 * finds a free extent and does all the dirty work required for allocation
7322 * returns the key for the extent through ins, and a tree buffer for
7323 * the first block of the extent through buf.
7325 * returns the tree buffer or NULL.
7327 struct extent_buffer
*btrfs_alloc_tree_block(struct btrfs_trans_handle
*trans
,
7328 struct btrfs_root
*root
,
7329 u64 parent
, u64 root_objectid
,
7330 struct btrfs_disk_key
*key
, int level
,
7331 u64 hint
, u64 empty_size
)
7333 struct btrfs_key ins
;
7334 struct btrfs_block_rsv
*block_rsv
;
7335 struct extent_buffer
*buf
;
7338 u32 blocksize
= root
->nodesize
;
7339 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
7342 if (btrfs_test_is_dummy_root(root
)) {
7343 buf
= btrfs_init_new_buffer(trans
, root
, root
->alloc_bytenr
,
7346 root
->alloc_bytenr
+= blocksize
;
7350 block_rsv
= use_block_rsv(trans
, root
, blocksize
);
7351 if (IS_ERR(block_rsv
))
7352 return ERR_CAST(block_rsv
);
7354 ret
= btrfs_reserve_extent(root
, blocksize
, blocksize
,
7355 empty_size
, hint
, &ins
, 0, 0);
7357 unuse_block_rsv(root
->fs_info
, block_rsv
, blocksize
);
7358 return ERR_PTR(ret
);
7361 buf
= btrfs_init_new_buffer(trans
, root
, ins
.objectid
,
7363 BUG_ON(IS_ERR(buf
)); /* -ENOMEM */
7365 if (root_objectid
== BTRFS_TREE_RELOC_OBJECTID
) {
7367 parent
= ins
.objectid
;
7368 flags
|= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
7372 if (root_objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
7373 struct btrfs_delayed_extent_op
*extent_op
;
7374 extent_op
= btrfs_alloc_delayed_extent_op();
7375 BUG_ON(!extent_op
); /* -ENOMEM */
7377 memcpy(&extent_op
->key
, key
, sizeof(extent_op
->key
));
7379 memset(&extent_op
->key
, 0, sizeof(extent_op
->key
));
7380 extent_op
->flags_to_set
= flags
;
7381 if (skinny_metadata
)
7382 extent_op
->update_key
= 0;
7384 extent_op
->update_key
= 1;
7385 extent_op
->update_flags
= 1;
7386 extent_op
->is_data
= 0;
7387 extent_op
->level
= level
;
7389 ret
= btrfs_add_delayed_tree_ref(root
->fs_info
, trans
,
7391 ins
.offset
, parent
, root_objectid
,
7392 level
, BTRFS_ADD_DELAYED_EXTENT
,
7394 BUG_ON(ret
); /* -ENOMEM */
7399 struct walk_control
{
7400 u64 refs
[BTRFS_MAX_LEVEL
];
7401 u64 flags
[BTRFS_MAX_LEVEL
];
7402 struct btrfs_key update_progress
;
7413 #define DROP_REFERENCE 1
7414 #define UPDATE_BACKREF 2
7416 static noinline
void reada_walk_down(struct btrfs_trans_handle
*trans
,
7417 struct btrfs_root
*root
,
7418 struct walk_control
*wc
,
7419 struct btrfs_path
*path
)
7427 struct btrfs_key key
;
7428 struct extent_buffer
*eb
;
7433 if (path
->slots
[wc
->level
] < wc
->reada_slot
) {
7434 wc
->reada_count
= wc
->reada_count
* 2 / 3;
7435 wc
->reada_count
= max(wc
->reada_count
, 2);
7437 wc
->reada_count
= wc
->reada_count
* 3 / 2;
7438 wc
->reada_count
= min_t(int, wc
->reada_count
,
7439 BTRFS_NODEPTRS_PER_BLOCK(root
));
7442 eb
= path
->nodes
[wc
->level
];
7443 nritems
= btrfs_header_nritems(eb
);
7444 blocksize
= root
->nodesize
;
7446 for (slot
= path
->slots
[wc
->level
]; slot
< nritems
; slot
++) {
7447 if (nread
>= wc
->reada_count
)
7451 bytenr
= btrfs_node_blockptr(eb
, slot
);
7452 generation
= btrfs_node_ptr_generation(eb
, slot
);
7454 if (slot
== path
->slots
[wc
->level
])
7457 if (wc
->stage
== UPDATE_BACKREF
&&
7458 generation
<= root
->root_key
.offset
)
7461 /* We don't lock the tree block, it's OK to be racy here */
7462 ret
= btrfs_lookup_extent_info(trans
, root
, bytenr
,
7463 wc
->level
- 1, 1, &refs
,
7465 /* We don't care about errors in readahead. */
7470 if (wc
->stage
== DROP_REFERENCE
) {
7474 if (wc
->level
== 1 &&
7475 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7477 if (!wc
->update_ref
||
7478 generation
<= root
->root_key
.offset
)
7480 btrfs_node_key_to_cpu(eb
, &key
, slot
);
7481 ret
= btrfs_comp_cpu_keys(&key
,
7482 &wc
->update_progress
);
7486 if (wc
->level
== 1 &&
7487 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7491 readahead_tree_block(root
, bytenr
, blocksize
);
7494 wc
->reada_slot
= slot
;
7497 static int account_leaf_items(struct btrfs_trans_handle
*trans
,
7498 struct btrfs_root
*root
,
7499 struct extent_buffer
*eb
)
7501 int nr
= btrfs_header_nritems(eb
);
7502 int i
, extent_type
, ret
;
7503 struct btrfs_key key
;
7504 struct btrfs_file_extent_item
*fi
;
7505 u64 bytenr
, num_bytes
;
7507 for (i
= 0; i
< nr
; i
++) {
7508 btrfs_item_key_to_cpu(eb
, &key
, i
);
7510 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
7513 fi
= btrfs_item_ptr(eb
, i
, struct btrfs_file_extent_item
);
7514 /* filter out non qgroup-accountable extents */
7515 extent_type
= btrfs_file_extent_type(eb
, fi
);
7517 if (extent_type
== BTRFS_FILE_EXTENT_INLINE
)
7520 bytenr
= btrfs_file_extent_disk_bytenr(eb
, fi
);
7524 num_bytes
= btrfs_file_extent_disk_num_bytes(eb
, fi
);
7526 ret
= btrfs_qgroup_record_ref(trans
, root
->fs_info
,
7529 BTRFS_QGROUP_OPER_SUB_SUBTREE
, 0);
7537 * Walk up the tree from the bottom, freeing leaves and any interior
7538 * nodes which have had all slots visited. If a node (leaf or
7539 * interior) is freed, the node above it will have it's slot
7540 * incremented. The root node will never be freed.
7542 * At the end of this function, we should have a path which has all
7543 * slots incremented to the next position for a search. If we need to
7544 * read a new node it will be NULL and the node above it will have the
7545 * correct slot selected for a later read.
7547 * If we increment the root nodes slot counter past the number of
7548 * elements, 1 is returned to signal completion of the search.
7550 static int adjust_slots_upwards(struct btrfs_root
*root
,
7551 struct btrfs_path
*path
, int root_level
)
7555 struct extent_buffer
*eb
;
7557 if (root_level
== 0)
7560 while (level
<= root_level
) {
7561 eb
= path
->nodes
[level
];
7562 nr
= btrfs_header_nritems(eb
);
7563 path
->slots
[level
]++;
7564 slot
= path
->slots
[level
];
7565 if (slot
>= nr
|| level
== 0) {
7567 * Don't free the root - we will detect this
7568 * condition after our loop and return a
7569 * positive value for caller to stop walking the tree.
7571 if (level
!= root_level
) {
7572 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7573 path
->locks
[level
] = 0;
7575 free_extent_buffer(eb
);
7576 path
->nodes
[level
] = NULL
;
7577 path
->slots
[level
] = 0;
7581 * We have a valid slot to walk back down
7582 * from. Stop here so caller can process these
7591 eb
= path
->nodes
[root_level
];
7592 if (path
->slots
[root_level
] >= btrfs_header_nritems(eb
))
7599 * root_eb is the subtree root and is locked before this function is called.
7601 static int account_shared_subtree(struct btrfs_trans_handle
*trans
,
7602 struct btrfs_root
*root
,
7603 struct extent_buffer
*root_eb
,
7609 struct extent_buffer
*eb
= root_eb
;
7610 struct btrfs_path
*path
= NULL
;
7612 BUG_ON(root_level
< 0 || root_level
> BTRFS_MAX_LEVEL
);
7613 BUG_ON(root_eb
== NULL
);
7615 if (!root
->fs_info
->quota_enabled
)
7618 if (!extent_buffer_uptodate(root_eb
)) {
7619 ret
= btrfs_read_buffer(root_eb
, root_gen
);
7624 if (root_level
== 0) {
7625 ret
= account_leaf_items(trans
, root
, root_eb
);
7629 path
= btrfs_alloc_path();
7634 * Walk down the tree. Missing extent blocks are filled in as
7635 * we go. Metadata is accounted every time we read a new
7638 * When we reach a leaf, we account for file extent items in it,
7639 * walk back up the tree (adjusting slot pointers as we go)
7640 * and restart the search process.
7642 extent_buffer_get(root_eb
); /* For path */
7643 path
->nodes
[root_level
] = root_eb
;
7644 path
->slots
[root_level
] = 0;
7645 path
->locks
[root_level
] = 0; /* so release_path doesn't try to unlock */
7648 while (level
>= 0) {
7649 if (path
->nodes
[level
] == NULL
) {
7654 /* We need to get child blockptr/gen from
7655 * parent before we can read it. */
7656 eb
= path
->nodes
[level
+ 1];
7657 parent_slot
= path
->slots
[level
+ 1];
7658 child_bytenr
= btrfs_node_blockptr(eb
, parent_slot
);
7659 child_gen
= btrfs_node_ptr_generation(eb
, parent_slot
);
7661 eb
= read_tree_block(root
, child_bytenr
, child_gen
);
7662 if (!eb
|| !extent_buffer_uptodate(eb
)) {
7667 path
->nodes
[level
] = eb
;
7668 path
->slots
[level
] = 0;
7670 btrfs_tree_read_lock(eb
);
7671 btrfs_set_lock_blocking_rw(eb
, BTRFS_READ_LOCK
);
7672 path
->locks
[level
] = BTRFS_READ_LOCK_BLOCKING
;
7674 ret
= btrfs_qgroup_record_ref(trans
, root
->fs_info
,
7678 BTRFS_QGROUP_OPER_SUB_SUBTREE
,
7686 ret
= account_leaf_items(trans
, root
, path
->nodes
[level
]);
7690 /* Nonzero return here means we completed our search */
7691 ret
= adjust_slots_upwards(root
, path
, root_level
);
7695 /* Restart search with new slots */
7704 btrfs_free_path(path
);
7710 * helper to process tree block while walking down the tree.
7712 * when wc->stage == UPDATE_BACKREF, this function updates
7713 * back refs for pointers in the block.
7715 * NOTE: return value 1 means we should stop walking down.
7717 static noinline
int walk_down_proc(struct btrfs_trans_handle
*trans
,
7718 struct btrfs_root
*root
,
7719 struct btrfs_path
*path
,
7720 struct walk_control
*wc
, int lookup_info
)
7722 int level
= wc
->level
;
7723 struct extent_buffer
*eb
= path
->nodes
[level
];
7724 u64 flag
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
7727 if (wc
->stage
== UPDATE_BACKREF
&&
7728 btrfs_header_owner(eb
) != root
->root_key
.objectid
)
7732 * when reference count of tree block is 1, it won't increase
7733 * again. once full backref flag is set, we never clear it.
7736 ((wc
->stage
== DROP_REFERENCE
&& wc
->refs
[level
] != 1) ||
7737 (wc
->stage
== UPDATE_BACKREF
&& !(wc
->flags
[level
] & flag
)))) {
7738 BUG_ON(!path
->locks
[level
]);
7739 ret
= btrfs_lookup_extent_info(trans
, root
,
7740 eb
->start
, level
, 1,
7743 BUG_ON(ret
== -ENOMEM
);
7746 BUG_ON(wc
->refs
[level
] == 0);
7749 if (wc
->stage
== DROP_REFERENCE
) {
7750 if (wc
->refs
[level
] > 1)
7753 if (path
->locks
[level
] && !wc
->keep_locks
) {
7754 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7755 path
->locks
[level
] = 0;
7760 /* wc->stage == UPDATE_BACKREF */
7761 if (!(wc
->flags
[level
] & flag
)) {
7762 BUG_ON(!path
->locks
[level
]);
7763 ret
= btrfs_inc_ref(trans
, root
, eb
, 1);
7764 BUG_ON(ret
); /* -ENOMEM */
7765 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
7766 BUG_ON(ret
); /* -ENOMEM */
7767 ret
= btrfs_set_disk_extent_flags(trans
, root
, eb
->start
,
7769 btrfs_header_level(eb
), 0);
7770 BUG_ON(ret
); /* -ENOMEM */
7771 wc
->flags
[level
] |= flag
;
7775 * the block is shared by multiple trees, so it's not good to
7776 * keep the tree lock
7778 if (path
->locks
[level
] && level
> 0) {
7779 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7780 path
->locks
[level
] = 0;
7786 * helper to process tree block pointer.
7788 * when wc->stage == DROP_REFERENCE, this function checks
7789 * reference count of the block pointed to. if the block
7790 * is shared and we need update back refs for the subtree
7791 * rooted at the block, this function changes wc->stage to
7792 * UPDATE_BACKREF. if the block is shared and there is no
7793 * need to update back, this function drops the reference
7796 * NOTE: return value 1 means we should stop walking down.
7798 static noinline
int do_walk_down(struct btrfs_trans_handle
*trans
,
7799 struct btrfs_root
*root
,
7800 struct btrfs_path
*path
,
7801 struct walk_control
*wc
, int *lookup_info
)
7807 struct btrfs_key key
;
7808 struct extent_buffer
*next
;
7809 int level
= wc
->level
;
7812 bool need_account
= false;
7814 generation
= btrfs_node_ptr_generation(path
->nodes
[level
],
7815 path
->slots
[level
]);
7817 * if the lower level block was created before the snapshot
7818 * was created, we know there is no need to update back refs
7821 if (wc
->stage
== UPDATE_BACKREF
&&
7822 generation
<= root
->root_key
.offset
) {
7827 bytenr
= btrfs_node_blockptr(path
->nodes
[level
], path
->slots
[level
]);
7828 blocksize
= root
->nodesize
;
7830 next
= btrfs_find_tree_block(root
, bytenr
);
7832 next
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
7835 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, next
,
7839 btrfs_tree_lock(next
);
7840 btrfs_set_lock_blocking(next
);
7842 ret
= btrfs_lookup_extent_info(trans
, root
, bytenr
, level
- 1, 1,
7843 &wc
->refs
[level
- 1],
7844 &wc
->flags
[level
- 1]);
7846 btrfs_tree_unlock(next
);
7850 if (unlikely(wc
->refs
[level
- 1] == 0)) {
7851 btrfs_err(root
->fs_info
, "Missing references.");
7856 if (wc
->stage
== DROP_REFERENCE
) {
7857 if (wc
->refs
[level
- 1] > 1) {
7858 need_account
= true;
7860 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7863 if (!wc
->update_ref
||
7864 generation
<= root
->root_key
.offset
)
7867 btrfs_node_key_to_cpu(path
->nodes
[level
], &key
,
7868 path
->slots
[level
]);
7869 ret
= btrfs_comp_cpu_keys(&key
, &wc
->update_progress
);
7873 wc
->stage
= UPDATE_BACKREF
;
7874 wc
->shared_level
= level
- 1;
7878 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7882 if (!btrfs_buffer_uptodate(next
, generation
, 0)) {
7883 btrfs_tree_unlock(next
);
7884 free_extent_buffer(next
);
7890 if (reada
&& level
== 1)
7891 reada_walk_down(trans
, root
, wc
, path
);
7892 next
= read_tree_block(root
, bytenr
, generation
);
7893 if (!next
|| !extent_buffer_uptodate(next
)) {
7894 free_extent_buffer(next
);
7897 btrfs_tree_lock(next
);
7898 btrfs_set_lock_blocking(next
);
7902 BUG_ON(level
!= btrfs_header_level(next
));
7903 path
->nodes
[level
] = next
;
7904 path
->slots
[level
] = 0;
7905 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
7911 wc
->refs
[level
- 1] = 0;
7912 wc
->flags
[level
- 1] = 0;
7913 if (wc
->stage
== DROP_REFERENCE
) {
7914 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
) {
7915 parent
= path
->nodes
[level
]->start
;
7917 BUG_ON(root
->root_key
.objectid
!=
7918 btrfs_header_owner(path
->nodes
[level
]));
7923 ret
= account_shared_subtree(trans
, root
, next
,
7924 generation
, level
- 1);
7926 printk_ratelimited(KERN_ERR
"BTRFS: %s Error "
7927 "%d accounting shared subtree. Quota "
7928 "is out of sync, rescan required.\n",
7929 root
->fs_info
->sb
->s_id
, ret
);
7932 ret
= btrfs_free_extent(trans
, root
, bytenr
, blocksize
, parent
,
7933 root
->root_key
.objectid
, level
- 1, 0, 0);
7934 BUG_ON(ret
); /* -ENOMEM */
7936 btrfs_tree_unlock(next
);
7937 free_extent_buffer(next
);
7943 * helper to process tree block while walking up the tree.
7945 * when wc->stage == DROP_REFERENCE, this function drops
7946 * reference count on the block.
7948 * when wc->stage == UPDATE_BACKREF, this function changes
7949 * wc->stage back to DROP_REFERENCE if we changed wc->stage
7950 * to UPDATE_BACKREF previously while processing the block.
7952 * NOTE: return value 1 means we should stop walking up.
7954 static noinline
int walk_up_proc(struct btrfs_trans_handle
*trans
,
7955 struct btrfs_root
*root
,
7956 struct btrfs_path
*path
,
7957 struct walk_control
*wc
)
7960 int level
= wc
->level
;
7961 struct extent_buffer
*eb
= path
->nodes
[level
];
7964 if (wc
->stage
== UPDATE_BACKREF
) {
7965 BUG_ON(wc
->shared_level
< level
);
7966 if (level
< wc
->shared_level
)
7969 ret
= find_next_key(path
, level
+ 1, &wc
->update_progress
);
7973 wc
->stage
= DROP_REFERENCE
;
7974 wc
->shared_level
= -1;
7975 path
->slots
[level
] = 0;
7978 * check reference count again if the block isn't locked.
7979 * we should start walking down the tree again if reference
7982 if (!path
->locks
[level
]) {
7984 btrfs_tree_lock(eb
);
7985 btrfs_set_lock_blocking(eb
);
7986 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
7988 ret
= btrfs_lookup_extent_info(trans
, root
,
7989 eb
->start
, level
, 1,
7993 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7994 path
->locks
[level
] = 0;
7997 BUG_ON(wc
->refs
[level
] == 0);
7998 if (wc
->refs
[level
] == 1) {
7999 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
8000 path
->locks
[level
] = 0;
8006 /* wc->stage == DROP_REFERENCE */
8007 BUG_ON(wc
->refs
[level
] > 1 && !path
->locks
[level
]);
8009 if (wc
->refs
[level
] == 1) {
8011 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8012 ret
= btrfs_dec_ref(trans
, root
, eb
, 1);
8014 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
8015 BUG_ON(ret
); /* -ENOMEM */
8016 ret
= account_leaf_items(trans
, root
, eb
);
8018 printk_ratelimited(KERN_ERR
"BTRFS: %s Error "
8019 "%d accounting leaf items. Quota "
8020 "is out of sync, rescan required.\n",
8021 root
->fs_info
->sb
->s_id
, ret
);
8024 /* make block locked assertion in clean_tree_block happy */
8025 if (!path
->locks
[level
] &&
8026 btrfs_header_generation(eb
) == trans
->transid
) {
8027 btrfs_tree_lock(eb
);
8028 btrfs_set_lock_blocking(eb
);
8029 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8031 clean_tree_block(trans
, root
, eb
);
8034 if (eb
== root
->node
) {
8035 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8038 BUG_ON(root
->root_key
.objectid
!=
8039 btrfs_header_owner(eb
));
8041 if (wc
->flags
[level
+ 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8042 parent
= path
->nodes
[level
+ 1]->start
;
8044 BUG_ON(root
->root_key
.objectid
!=
8045 btrfs_header_owner(path
->nodes
[level
+ 1]));
8048 btrfs_free_tree_block(trans
, root
, eb
, parent
, wc
->refs
[level
] == 1);
8050 wc
->refs
[level
] = 0;
8051 wc
->flags
[level
] = 0;
8055 static noinline
int walk_down_tree(struct btrfs_trans_handle
*trans
,
8056 struct btrfs_root
*root
,
8057 struct btrfs_path
*path
,
8058 struct walk_control
*wc
)
8060 int level
= wc
->level
;
8061 int lookup_info
= 1;
8064 while (level
>= 0) {
8065 ret
= walk_down_proc(trans
, root
, path
, wc
, lookup_info
);
8072 if (path
->slots
[level
] >=
8073 btrfs_header_nritems(path
->nodes
[level
]))
8076 ret
= do_walk_down(trans
, root
, path
, wc
, &lookup_info
);
8078 path
->slots
[level
]++;
8087 static noinline
int walk_up_tree(struct btrfs_trans_handle
*trans
,
8088 struct btrfs_root
*root
,
8089 struct btrfs_path
*path
,
8090 struct walk_control
*wc
, int max_level
)
8092 int level
= wc
->level
;
8095 path
->slots
[level
] = btrfs_header_nritems(path
->nodes
[level
]);
8096 while (level
< max_level
&& path
->nodes
[level
]) {
8098 if (path
->slots
[level
] + 1 <
8099 btrfs_header_nritems(path
->nodes
[level
])) {
8100 path
->slots
[level
]++;
8103 ret
= walk_up_proc(trans
, root
, path
, wc
);
8107 if (path
->locks
[level
]) {
8108 btrfs_tree_unlock_rw(path
->nodes
[level
],
8109 path
->locks
[level
]);
8110 path
->locks
[level
] = 0;
8112 free_extent_buffer(path
->nodes
[level
]);
8113 path
->nodes
[level
] = NULL
;
8121 * drop a subvolume tree.
8123 * this function traverses the tree freeing any blocks that only
8124 * referenced by the tree.
8126 * when a shared tree block is found. this function decreases its
8127 * reference count by one. if update_ref is true, this function
8128 * also make sure backrefs for the shared block and all lower level
8129 * blocks are properly updated.
8131 * If called with for_reloc == 0, may exit early with -EAGAIN
8133 int btrfs_drop_snapshot(struct btrfs_root
*root
,
8134 struct btrfs_block_rsv
*block_rsv
, int update_ref
,
8137 struct btrfs_path
*path
;
8138 struct btrfs_trans_handle
*trans
;
8139 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
8140 struct btrfs_root_item
*root_item
= &root
->root_item
;
8141 struct walk_control
*wc
;
8142 struct btrfs_key key
;
8146 bool root_dropped
= false;
8148 btrfs_debug(root
->fs_info
, "Drop subvolume %llu", root
->objectid
);
8150 path
= btrfs_alloc_path();
8156 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
8158 btrfs_free_path(path
);
8163 trans
= btrfs_start_transaction(tree_root
, 0);
8164 if (IS_ERR(trans
)) {
8165 err
= PTR_ERR(trans
);
8170 trans
->block_rsv
= block_rsv
;
8172 if (btrfs_disk_key_objectid(&root_item
->drop_progress
) == 0) {
8173 level
= btrfs_header_level(root
->node
);
8174 path
->nodes
[level
] = btrfs_lock_root_node(root
);
8175 btrfs_set_lock_blocking(path
->nodes
[level
]);
8176 path
->slots
[level
] = 0;
8177 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8178 memset(&wc
->update_progress
, 0,
8179 sizeof(wc
->update_progress
));
8181 btrfs_disk_key_to_cpu(&key
, &root_item
->drop_progress
);
8182 memcpy(&wc
->update_progress
, &key
,
8183 sizeof(wc
->update_progress
));
8185 level
= root_item
->drop_level
;
8187 path
->lowest_level
= level
;
8188 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
8189 path
->lowest_level
= 0;
8197 * unlock our path, this is safe because only this
8198 * function is allowed to delete this snapshot
8200 btrfs_unlock_up_safe(path
, 0);
8202 level
= btrfs_header_level(root
->node
);
8204 btrfs_tree_lock(path
->nodes
[level
]);
8205 btrfs_set_lock_blocking(path
->nodes
[level
]);
8206 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8208 ret
= btrfs_lookup_extent_info(trans
, root
,
8209 path
->nodes
[level
]->start
,
8210 level
, 1, &wc
->refs
[level
],
8216 BUG_ON(wc
->refs
[level
] == 0);
8218 if (level
== root_item
->drop_level
)
8221 btrfs_tree_unlock(path
->nodes
[level
]);
8222 path
->locks
[level
] = 0;
8223 WARN_ON(wc
->refs
[level
] != 1);
8229 wc
->shared_level
= -1;
8230 wc
->stage
= DROP_REFERENCE
;
8231 wc
->update_ref
= update_ref
;
8233 wc
->for_reloc
= for_reloc
;
8234 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(root
);
8238 ret
= walk_down_tree(trans
, root
, path
, wc
);
8244 ret
= walk_up_tree(trans
, root
, path
, wc
, BTRFS_MAX_LEVEL
);
8251 BUG_ON(wc
->stage
!= DROP_REFERENCE
);
8255 if (wc
->stage
== DROP_REFERENCE
) {
8257 btrfs_node_key(path
->nodes
[level
],
8258 &root_item
->drop_progress
,
8259 path
->slots
[level
]);
8260 root_item
->drop_level
= level
;
8263 BUG_ON(wc
->level
== 0);
8264 if (btrfs_should_end_transaction(trans
, tree_root
) ||
8265 (!for_reloc
&& btrfs_need_cleaner_sleep(root
))) {
8266 ret
= btrfs_update_root(trans
, tree_root
,
8270 btrfs_abort_transaction(trans
, tree_root
, ret
);
8276 * Qgroup update accounting is run from
8277 * delayed ref handling. This usually works
8278 * out because delayed refs are normally the
8279 * only way qgroup updates are added. However,
8280 * we may have added updates during our tree
8281 * walk so run qgroups here to make sure we
8282 * don't lose any updates.
8284 ret
= btrfs_delayed_qgroup_accounting(trans
,
8287 printk_ratelimited(KERN_ERR
"BTRFS: Failure %d "
8288 "running qgroup updates "
8289 "during snapshot delete. "
8290 "Quota is out of sync, "
8291 "rescan required.\n", ret
);
8293 btrfs_end_transaction_throttle(trans
, tree_root
);
8294 if (!for_reloc
&& btrfs_need_cleaner_sleep(root
)) {
8295 pr_debug("BTRFS: drop snapshot early exit\n");
8300 trans
= btrfs_start_transaction(tree_root
, 0);
8301 if (IS_ERR(trans
)) {
8302 err
= PTR_ERR(trans
);
8306 trans
->block_rsv
= block_rsv
;
8309 btrfs_release_path(path
);
8313 ret
= btrfs_del_root(trans
, tree_root
, &root
->root_key
);
8315 btrfs_abort_transaction(trans
, tree_root
, ret
);
8319 if (root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
) {
8320 ret
= btrfs_find_root(tree_root
, &root
->root_key
, path
,
8323 btrfs_abort_transaction(trans
, tree_root
, ret
);
8326 } else if (ret
> 0) {
8327 /* if we fail to delete the orphan item this time
8328 * around, it'll get picked up the next time.
8330 * The most common failure here is just -ENOENT.
8332 btrfs_del_orphan_item(trans
, tree_root
,
8333 root
->root_key
.objectid
);
8337 if (test_bit(BTRFS_ROOT_IN_RADIX
, &root
->state
)) {
8338 btrfs_drop_and_free_fs_root(tree_root
->fs_info
, root
);
8340 free_extent_buffer(root
->node
);
8341 free_extent_buffer(root
->commit_root
);
8342 btrfs_put_fs_root(root
);
8344 root_dropped
= true;
8346 ret
= btrfs_delayed_qgroup_accounting(trans
, tree_root
->fs_info
);
8348 printk_ratelimited(KERN_ERR
"BTRFS: Failure %d "
8349 "running qgroup updates "
8350 "during snapshot delete. "
8351 "Quota is out of sync, "
8352 "rescan required.\n", ret
);
8354 btrfs_end_transaction_throttle(trans
, tree_root
);
8357 btrfs_free_path(path
);
8360 * So if we need to stop dropping the snapshot for whatever reason we
8361 * need to make sure to add it back to the dead root list so that we
8362 * keep trying to do the work later. This also cleans up roots if we
8363 * don't have it in the radix (like when we recover after a power fail
8364 * or unmount) so we don't leak memory.
8366 if (!for_reloc
&& root_dropped
== false)
8367 btrfs_add_dead_root(root
);
8368 if (err
&& err
!= -EAGAIN
)
8369 btrfs_std_error(root
->fs_info
, err
);
8374 * drop subtree rooted at tree block 'node'.
8376 * NOTE: this function will unlock and release tree block 'node'
8377 * only used by relocation code
8379 int btrfs_drop_subtree(struct btrfs_trans_handle
*trans
,
8380 struct btrfs_root
*root
,
8381 struct extent_buffer
*node
,
8382 struct extent_buffer
*parent
)
8384 struct btrfs_path
*path
;
8385 struct walk_control
*wc
;
8391 BUG_ON(root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
);
8393 path
= btrfs_alloc_path();
8397 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
8399 btrfs_free_path(path
);
8403 btrfs_assert_tree_locked(parent
);
8404 parent_level
= btrfs_header_level(parent
);
8405 extent_buffer_get(parent
);
8406 path
->nodes
[parent_level
] = parent
;
8407 path
->slots
[parent_level
] = btrfs_header_nritems(parent
);
8409 btrfs_assert_tree_locked(node
);
8410 level
= btrfs_header_level(node
);
8411 path
->nodes
[level
] = node
;
8412 path
->slots
[level
] = 0;
8413 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8415 wc
->refs
[parent_level
] = 1;
8416 wc
->flags
[parent_level
] = BTRFS_BLOCK_FLAG_FULL_BACKREF
;
8418 wc
->shared_level
= -1;
8419 wc
->stage
= DROP_REFERENCE
;
8423 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(root
);
8426 wret
= walk_down_tree(trans
, root
, path
, wc
);
8432 wret
= walk_up_tree(trans
, root
, path
, wc
, parent_level
);
8440 btrfs_free_path(path
);
8444 static u64
update_block_group_flags(struct btrfs_root
*root
, u64 flags
)
8450 * if restripe for this chunk_type is on pick target profile and
8451 * return, otherwise do the usual balance
8453 stripped
= get_restripe_target(root
->fs_info
, flags
);
8455 return extended_to_chunk(stripped
);
8457 num_devices
= root
->fs_info
->fs_devices
->rw_devices
;
8459 stripped
= BTRFS_BLOCK_GROUP_RAID0
|
8460 BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
|
8461 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID10
;
8463 if (num_devices
== 1) {
8464 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
8465 stripped
= flags
& ~stripped
;
8467 /* turn raid0 into single device chunks */
8468 if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
8471 /* turn mirroring into duplication */
8472 if (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
8473 BTRFS_BLOCK_GROUP_RAID10
))
8474 return stripped
| BTRFS_BLOCK_GROUP_DUP
;
8476 /* they already had raid on here, just return */
8477 if (flags
& stripped
)
8480 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
8481 stripped
= flags
& ~stripped
;
8483 /* switch duplicated blocks with raid1 */
8484 if (flags
& BTRFS_BLOCK_GROUP_DUP
)
8485 return stripped
| BTRFS_BLOCK_GROUP_RAID1
;
8487 /* this is drive concat, leave it alone */
8493 static int set_block_group_ro(struct btrfs_block_group_cache
*cache
, int force
)
8495 struct btrfs_space_info
*sinfo
= cache
->space_info
;
8497 u64 min_allocable_bytes
;
8502 * We need some metadata space and system metadata space for
8503 * allocating chunks in some corner cases until we force to set
8504 * it to be readonly.
8507 (BTRFS_BLOCK_GROUP_SYSTEM
| BTRFS_BLOCK_GROUP_METADATA
)) &&
8509 min_allocable_bytes
= 1 * 1024 * 1024;
8511 min_allocable_bytes
= 0;
8513 spin_lock(&sinfo
->lock
);
8514 spin_lock(&cache
->lock
);
8521 num_bytes
= cache
->key
.offset
- cache
->reserved
- cache
->pinned
-
8522 cache
->bytes_super
- btrfs_block_group_used(&cache
->item
);
8524 if (sinfo
->bytes_used
+ sinfo
->bytes_reserved
+ sinfo
->bytes_pinned
+
8525 sinfo
->bytes_may_use
+ sinfo
->bytes_readonly
+ num_bytes
+
8526 min_allocable_bytes
<= sinfo
->total_bytes
) {
8527 sinfo
->bytes_readonly
+= num_bytes
;
8529 list_add_tail(&cache
->ro_list
, &sinfo
->ro_bgs
);
8533 spin_unlock(&cache
->lock
);
8534 spin_unlock(&sinfo
->lock
);
8538 int btrfs_set_block_group_ro(struct btrfs_root
*root
,
8539 struct btrfs_block_group_cache
*cache
)
8542 struct btrfs_trans_handle
*trans
;
8548 trans
= btrfs_join_transaction(root
);
8550 return PTR_ERR(trans
);
8552 alloc_flags
= update_block_group_flags(root
, cache
->flags
);
8553 if (alloc_flags
!= cache
->flags
) {
8554 ret
= do_chunk_alloc(trans
, root
, alloc_flags
,
8560 ret
= set_block_group_ro(cache
, 0);
8563 alloc_flags
= get_alloc_profile(root
, cache
->space_info
->flags
);
8564 ret
= do_chunk_alloc(trans
, root
, alloc_flags
,
8568 ret
= set_block_group_ro(cache
, 0);
8570 btrfs_end_transaction(trans
, root
);
8574 int btrfs_force_chunk_alloc(struct btrfs_trans_handle
*trans
,
8575 struct btrfs_root
*root
, u64 type
)
8577 u64 alloc_flags
= get_alloc_profile(root
, type
);
8578 return do_chunk_alloc(trans
, root
, alloc_flags
,
8583 * helper to account the unused space of all the readonly block group in the
8584 * space_info. takes mirrors into account.
8586 u64
btrfs_account_ro_block_groups_free_space(struct btrfs_space_info
*sinfo
)
8588 struct btrfs_block_group_cache
*block_group
;
8592 /* It's df, we don't care if it's racey */
8593 if (list_empty(&sinfo
->ro_bgs
))
8596 spin_lock(&sinfo
->lock
);
8597 list_for_each_entry(block_group
, &sinfo
->ro_bgs
, ro_list
) {
8598 spin_lock(&block_group
->lock
);
8600 if (!block_group
->ro
) {
8601 spin_unlock(&block_group
->lock
);
8605 if (block_group
->flags
& (BTRFS_BLOCK_GROUP_RAID1
|
8606 BTRFS_BLOCK_GROUP_RAID10
|
8607 BTRFS_BLOCK_GROUP_DUP
))
8612 free_bytes
+= (block_group
->key
.offset
-
8613 btrfs_block_group_used(&block_group
->item
)) *
8616 spin_unlock(&block_group
->lock
);
8618 spin_unlock(&sinfo
->lock
);
8623 void btrfs_set_block_group_rw(struct btrfs_root
*root
,
8624 struct btrfs_block_group_cache
*cache
)
8626 struct btrfs_space_info
*sinfo
= cache
->space_info
;
8631 spin_lock(&sinfo
->lock
);
8632 spin_lock(&cache
->lock
);
8633 num_bytes
= cache
->key
.offset
- cache
->reserved
- cache
->pinned
-
8634 cache
->bytes_super
- btrfs_block_group_used(&cache
->item
);
8635 sinfo
->bytes_readonly
-= num_bytes
;
8637 list_del_init(&cache
->ro_list
);
8638 spin_unlock(&cache
->lock
);
8639 spin_unlock(&sinfo
->lock
);
8643 * checks to see if its even possible to relocate this block group.
8645 * @return - -1 if it's not a good idea to relocate this block group, 0 if its
8646 * ok to go ahead and try.
8648 int btrfs_can_relocate(struct btrfs_root
*root
, u64 bytenr
)
8650 struct btrfs_block_group_cache
*block_group
;
8651 struct btrfs_space_info
*space_info
;
8652 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
8653 struct btrfs_device
*device
;
8654 struct btrfs_trans_handle
*trans
;
8663 block_group
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
8665 /* odd, couldn't find the block group, leave it alone */
8669 min_free
= btrfs_block_group_used(&block_group
->item
);
8671 /* no bytes used, we're good */
8675 space_info
= block_group
->space_info
;
8676 spin_lock(&space_info
->lock
);
8678 full
= space_info
->full
;
8681 * if this is the last block group we have in this space, we can't
8682 * relocate it unless we're able to allocate a new chunk below.
8684 * Otherwise, we need to make sure we have room in the space to handle
8685 * all of the extents from this block group. If we can, we're good
8687 if ((space_info
->total_bytes
!= block_group
->key
.offset
) &&
8688 (space_info
->bytes_used
+ space_info
->bytes_reserved
+
8689 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
8690 min_free
< space_info
->total_bytes
)) {
8691 spin_unlock(&space_info
->lock
);
8694 spin_unlock(&space_info
->lock
);
8697 * ok we don't have enough space, but maybe we have free space on our
8698 * devices to allocate new chunks for relocation, so loop through our
8699 * alloc devices and guess if we have enough space. if this block
8700 * group is going to be restriped, run checks against the target
8701 * profile instead of the current one.
8713 target
= get_restripe_target(root
->fs_info
, block_group
->flags
);
8715 index
= __get_raid_index(extended_to_chunk(target
));
8718 * this is just a balance, so if we were marked as full
8719 * we know there is no space for a new chunk
8724 index
= get_block_group_index(block_group
);
8727 if (index
== BTRFS_RAID_RAID10
) {
8731 } else if (index
== BTRFS_RAID_RAID1
) {
8733 } else if (index
== BTRFS_RAID_DUP
) {
8736 } else if (index
== BTRFS_RAID_RAID0
) {
8737 dev_min
= fs_devices
->rw_devices
;
8738 do_div(min_free
, dev_min
);
8741 /* We need to do this so that we can look at pending chunks */
8742 trans
= btrfs_join_transaction(root
);
8743 if (IS_ERR(trans
)) {
8744 ret
= PTR_ERR(trans
);
8748 mutex_lock(&root
->fs_info
->chunk_mutex
);
8749 list_for_each_entry(device
, &fs_devices
->alloc_list
, dev_alloc_list
) {
8753 * check to make sure we can actually find a chunk with enough
8754 * space to fit our block group in.
8756 if (device
->total_bytes
> device
->bytes_used
+ min_free
&&
8757 !device
->is_tgtdev_for_dev_replace
) {
8758 ret
= find_free_dev_extent(trans
, device
, min_free
,
8763 if (dev_nr
>= dev_min
)
8769 mutex_unlock(&root
->fs_info
->chunk_mutex
);
8770 btrfs_end_transaction(trans
, root
);
8772 btrfs_put_block_group(block_group
);
8776 static int find_first_block_group(struct btrfs_root
*root
,
8777 struct btrfs_path
*path
, struct btrfs_key
*key
)
8780 struct btrfs_key found_key
;
8781 struct extent_buffer
*leaf
;
8784 ret
= btrfs_search_slot(NULL
, root
, key
, path
, 0, 0);
8789 slot
= path
->slots
[0];
8790 leaf
= path
->nodes
[0];
8791 if (slot
>= btrfs_header_nritems(leaf
)) {
8792 ret
= btrfs_next_leaf(root
, path
);
8799 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
8801 if (found_key
.objectid
>= key
->objectid
&&
8802 found_key
.type
== BTRFS_BLOCK_GROUP_ITEM_KEY
) {
8812 void btrfs_put_block_group_cache(struct btrfs_fs_info
*info
)
8814 struct btrfs_block_group_cache
*block_group
;
8818 struct inode
*inode
;
8820 block_group
= btrfs_lookup_first_block_group(info
, last
);
8821 while (block_group
) {
8822 spin_lock(&block_group
->lock
);
8823 if (block_group
->iref
)
8825 spin_unlock(&block_group
->lock
);
8826 block_group
= next_block_group(info
->tree_root
,
8836 inode
= block_group
->inode
;
8837 block_group
->iref
= 0;
8838 block_group
->inode
= NULL
;
8839 spin_unlock(&block_group
->lock
);
8841 last
= block_group
->key
.objectid
+ block_group
->key
.offset
;
8842 btrfs_put_block_group(block_group
);
8846 int btrfs_free_block_groups(struct btrfs_fs_info
*info
)
8848 struct btrfs_block_group_cache
*block_group
;
8849 struct btrfs_space_info
*space_info
;
8850 struct btrfs_caching_control
*caching_ctl
;
8853 down_write(&info
->commit_root_sem
);
8854 while (!list_empty(&info
->caching_block_groups
)) {
8855 caching_ctl
= list_entry(info
->caching_block_groups
.next
,
8856 struct btrfs_caching_control
, list
);
8857 list_del(&caching_ctl
->list
);
8858 put_caching_control(caching_ctl
);
8860 up_write(&info
->commit_root_sem
);
8862 spin_lock(&info
->unused_bgs_lock
);
8863 while (!list_empty(&info
->unused_bgs
)) {
8864 block_group
= list_first_entry(&info
->unused_bgs
,
8865 struct btrfs_block_group_cache
,
8867 list_del_init(&block_group
->bg_list
);
8868 btrfs_put_block_group(block_group
);
8870 spin_unlock(&info
->unused_bgs_lock
);
8872 spin_lock(&info
->block_group_cache_lock
);
8873 while ((n
= rb_last(&info
->block_group_cache_tree
)) != NULL
) {
8874 block_group
= rb_entry(n
, struct btrfs_block_group_cache
,
8876 rb_erase(&block_group
->cache_node
,
8877 &info
->block_group_cache_tree
);
8878 spin_unlock(&info
->block_group_cache_lock
);
8880 down_write(&block_group
->space_info
->groups_sem
);
8881 list_del(&block_group
->list
);
8882 up_write(&block_group
->space_info
->groups_sem
);
8884 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
8885 wait_block_group_cache_done(block_group
);
8888 * We haven't cached this block group, which means we could
8889 * possibly have excluded extents on this block group.
8891 if (block_group
->cached
== BTRFS_CACHE_NO
||
8892 block_group
->cached
== BTRFS_CACHE_ERROR
)
8893 free_excluded_extents(info
->extent_root
, block_group
);
8895 btrfs_remove_free_space_cache(block_group
);
8896 btrfs_put_block_group(block_group
);
8898 spin_lock(&info
->block_group_cache_lock
);
8900 spin_unlock(&info
->block_group_cache_lock
);
8902 /* now that all the block groups are freed, go through and
8903 * free all the space_info structs. This is only called during
8904 * the final stages of unmount, and so we know nobody is
8905 * using them. We call synchronize_rcu() once before we start,
8906 * just to be on the safe side.
8910 release_global_block_rsv(info
);
8912 while (!list_empty(&info
->space_info
)) {
8915 space_info
= list_entry(info
->space_info
.next
,
8916 struct btrfs_space_info
,
8918 if (btrfs_test_opt(info
->tree_root
, ENOSPC_DEBUG
)) {
8919 if (WARN_ON(space_info
->bytes_pinned
> 0 ||
8920 space_info
->bytes_reserved
> 0 ||
8921 space_info
->bytes_may_use
> 0)) {
8922 dump_space_info(space_info
, 0, 0);
8925 list_del(&space_info
->list
);
8926 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++) {
8927 struct kobject
*kobj
;
8928 kobj
= space_info
->block_group_kobjs
[i
];
8929 space_info
->block_group_kobjs
[i
] = NULL
;
8935 kobject_del(&space_info
->kobj
);
8936 kobject_put(&space_info
->kobj
);
8941 static void __link_block_group(struct btrfs_space_info
*space_info
,
8942 struct btrfs_block_group_cache
*cache
)
8944 int index
= get_block_group_index(cache
);
8947 down_write(&space_info
->groups_sem
);
8948 if (list_empty(&space_info
->block_groups
[index
]))
8950 list_add_tail(&cache
->list
, &space_info
->block_groups
[index
]);
8951 up_write(&space_info
->groups_sem
);
8954 struct raid_kobject
*rkobj
;
8957 rkobj
= kzalloc(sizeof(*rkobj
), GFP_NOFS
);
8960 rkobj
->raid_type
= index
;
8961 kobject_init(&rkobj
->kobj
, &btrfs_raid_ktype
);
8962 ret
= kobject_add(&rkobj
->kobj
, &space_info
->kobj
,
8963 "%s", get_raid_name(index
));
8965 kobject_put(&rkobj
->kobj
);
8968 space_info
->block_group_kobjs
[index
] = &rkobj
->kobj
;
8973 pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n");
8976 static struct btrfs_block_group_cache
*
8977 btrfs_create_block_group_cache(struct btrfs_root
*root
, u64 start
, u64 size
)
8979 struct btrfs_block_group_cache
*cache
;
8981 cache
= kzalloc(sizeof(*cache
), GFP_NOFS
);
8985 cache
->free_space_ctl
= kzalloc(sizeof(*cache
->free_space_ctl
),
8987 if (!cache
->free_space_ctl
) {
8992 cache
->key
.objectid
= start
;
8993 cache
->key
.offset
= size
;
8994 cache
->key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
8996 cache
->sectorsize
= root
->sectorsize
;
8997 cache
->fs_info
= root
->fs_info
;
8998 cache
->full_stripe_len
= btrfs_full_stripe_len(root
,
8999 &root
->fs_info
->mapping_tree
,
9001 atomic_set(&cache
->count
, 1);
9002 spin_lock_init(&cache
->lock
);
9003 init_rwsem(&cache
->data_rwsem
);
9004 INIT_LIST_HEAD(&cache
->list
);
9005 INIT_LIST_HEAD(&cache
->cluster_list
);
9006 INIT_LIST_HEAD(&cache
->bg_list
);
9007 INIT_LIST_HEAD(&cache
->ro_list
);
9008 btrfs_init_free_space_ctl(cache
);
9013 int btrfs_read_block_groups(struct btrfs_root
*root
)
9015 struct btrfs_path
*path
;
9017 struct btrfs_block_group_cache
*cache
;
9018 struct btrfs_fs_info
*info
= root
->fs_info
;
9019 struct btrfs_space_info
*space_info
;
9020 struct btrfs_key key
;
9021 struct btrfs_key found_key
;
9022 struct extent_buffer
*leaf
;
9026 root
= info
->extent_root
;
9029 key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
9030 path
= btrfs_alloc_path();
9035 cache_gen
= btrfs_super_cache_generation(root
->fs_info
->super_copy
);
9036 if (btrfs_test_opt(root
, SPACE_CACHE
) &&
9037 btrfs_super_generation(root
->fs_info
->super_copy
) != cache_gen
)
9039 if (btrfs_test_opt(root
, CLEAR_CACHE
))
9043 ret
= find_first_block_group(root
, path
, &key
);
9049 leaf
= path
->nodes
[0];
9050 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
9052 cache
= btrfs_create_block_group_cache(root
, found_key
.objectid
,
9061 * When we mount with old space cache, we need to
9062 * set BTRFS_DC_CLEAR and set dirty flag.
9064 * a) Setting 'BTRFS_DC_CLEAR' makes sure that we
9065 * truncate the old free space cache inode and
9067 * b) Setting 'dirty flag' makes sure that we flush
9068 * the new space cache info onto disk.
9070 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
9071 if (btrfs_test_opt(root
, SPACE_CACHE
))
9075 read_extent_buffer(leaf
, &cache
->item
,
9076 btrfs_item_ptr_offset(leaf
, path
->slots
[0]),
9077 sizeof(cache
->item
));
9078 cache
->flags
= btrfs_block_group_flags(&cache
->item
);
9080 key
.objectid
= found_key
.objectid
+ found_key
.offset
;
9081 btrfs_release_path(path
);
9084 * We need to exclude the super stripes now so that the space
9085 * info has super bytes accounted for, otherwise we'll think
9086 * we have more space than we actually do.
9088 ret
= exclude_super_stripes(root
, cache
);
9091 * We may have excluded something, so call this just in
9094 free_excluded_extents(root
, cache
);
9095 btrfs_put_block_group(cache
);
9100 * check for two cases, either we are full, and therefore
9101 * don't need to bother with the caching work since we won't
9102 * find any space, or we are empty, and we can just add all
9103 * the space in and be done with it. This saves us _alot_ of
9104 * time, particularly in the full case.
9106 if (found_key
.offset
== btrfs_block_group_used(&cache
->item
)) {
9107 cache
->last_byte_to_unpin
= (u64
)-1;
9108 cache
->cached
= BTRFS_CACHE_FINISHED
;
9109 free_excluded_extents(root
, cache
);
9110 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
9111 cache
->last_byte_to_unpin
= (u64
)-1;
9112 cache
->cached
= BTRFS_CACHE_FINISHED
;
9113 add_new_free_space(cache
, root
->fs_info
,
9115 found_key
.objectid
+
9117 free_excluded_extents(root
, cache
);
9120 ret
= btrfs_add_block_group_cache(root
->fs_info
, cache
);
9122 btrfs_remove_free_space_cache(cache
);
9123 btrfs_put_block_group(cache
);
9127 ret
= update_space_info(info
, cache
->flags
, found_key
.offset
,
9128 btrfs_block_group_used(&cache
->item
),
9131 btrfs_remove_free_space_cache(cache
);
9132 spin_lock(&info
->block_group_cache_lock
);
9133 rb_erase(&cache
->cache_node
,
9134 &info
->block_group_cache_tree
);
9135 spin_unlock(&info
->block_group_cache_lock
);
9136 btrfs_put_block_group(cache
);
9140 cache
->space_info
= space_info
;
9141 spin_lock(&cache
->space_info
->lock
);
9142 cache
->space_info
->bytes_readonly
+= cache
->bytes_super
;
9143 spin_unlock(&cache
->space_info
->lock
);
9145 __link_block_group(space_info
, cache
);
9147 set_avail_alloc_bits(root
->fs_info
, cache
->flags
);
9148 if (btrfs_chunk_readonly(root
, cache
->key
.objectid
)) {
9149 set_block_group_ro(cache
, 1);
9150 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
9151 spin_lock(&info
->unused_bgs_lock
);
9152 /* Should always be true but just in case. */
9153 if (list_empty(&cache
->bg_list
)) {
9154 btrfs_get_block_group(cache
);
9155 list_add_tail(&cache
->bg_list
,
9158 spin_unlock(&info
->unused_bgs_lock
);
9162 list_for_each_entry_rcu(space_info
, &root
->fs_info
->space_info
, list
) {
9163 if (!(get_alloc_profile(root
, space_info
->flags
) &
9164 (BTRFS_BLOCK_GROUP_RAID10
|
9165 BTRFS_BLOCK_GROUP_RAID1
|
9166 BTRFS_BLOCK_GROUP_RAID5
|
9167 BTRFS_BLOCK_GROUP_RAID6
|
9168 BTRFS_BLOCK_GROUP_DUP
)))
9171 * avoid allocating from un-mirrored block group if there are
9172 * mirrored block groups.
9174 list_for_each_entry(cache
,
9175 &space_info
->block_groups
[BTRFS_RAID_RAID0
],
9177 set_block_group_ro(cache
, 1);
9178 list_for_each_entry(cache
,
9179 &space_info
->block_groups
[BTRFS_RAID_SINGLE
],
9181 set_block_group_ro(cache
, 1);
9184 init_global_block_rsv(info
);
9187 btrfs_free_path(path
);
9191 void btrfs_create_pending_block_groups(struct btrfs_trans_handle
*trans
,
9192 struct btrfs_root
*root
)
9194 struct btrfs_block_group_cache
*block_group
, *tmp
;
9195 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
9196 struct btrfs_block_group_item item
;
9197 struct btrfs_key key
;
9200 list_for_each_entry_safe(block_group
, tmp
, &trans
->new_bgs
, bg_list
) {
9201 list_del_init(&block_group
->bg_list
);
9205 spin_lock(&block_group
->lock
);
9206 memcpy(&item
, &block_group
->item
, sizeof(item
));
9207 memcpy(&key
, &block_group
->key
, sizeof(key
));
9208 spin_unlock(&block_group
->lock
);
9210 ret
= btrfs_insert_item(trans
, extent_root
, &key
, &item
,
9213 btrfs_abort_transaction(trans
, extent_root
, ret
);
9214 ret
= btrfs_finish_chunk_alloc(trans
, extent_root
,
9215 key
.objectid
, key
.offset
);
9217 btrfs_abort_transaction(trans
, extent_root
, ret
);
9221 int btrfs_make_block_group(struct btrfs_trans_handle
*trans
,
9222 struct btrfs_root
*root
, u64 bytes_used
,
9223 u64 type
, u64 chunk_objectid
, u64 chunk_offset
,
9227 struct btrfs_root
*extent_root
;
9228 struct btrfs_block_group_cache
*cache
;
9230 extent_root
= root
->fs_info
->extent_root
;
9232 btrfs_set_log_full_commit(root
->fs_info
, trans
);
9234 cache
= btrfs_create_block_group_cache(root
, chunk_offset
, size
);
9238 btrfs_set_block_group_used(&cache
->item
, bytes_used
);
9239 btrfs_set_block_group_chunk_objectid(&cache
->item
, chunk_objectid
);
9240 btrfs_set_block_group_flags(&cache
->item
, type
);
9242 cache
->flags
= type
;
9243 cache
->last_byte_to_unpin
= (u64
)-1;
9244 cache
->cached
= BTRFS_CACHE_FINISHED
;
9245 ret
= exclude_super_stripes(root
, cache
);
9248 * We may have excluded something, so call this just in
9251 free_excluded_extents(root
, cache
);
9252 btrfs_put_block_group(cache
);
9256 add_new_free_space(cache
, root
->fs_info
, chunk_offset
,
9257 chunk_offset
+ size
);
9259 free_excluded_extents(root
, cache
);
9261 ret
= btrfs_add_block_group_cache(root
->fs_info
, cache
);
9263 btrfs_remove_free_space_cache(cache
);
9264 btrfs_put_block_group(cache
);
9268 ret
= update_space_info(root
->fs_info
, cache
->flags
, size
, bytes_used
,
9269 &cache
->space_info
);
9271 btrfs_remove_free_space_cache(cache
);
9272 spin_lock(&root
->fs_info
->block_group_cache_lock
);
9273 rb_erase(&cache
->cache_node
,
9274 &root
->fs_info
->block_group_cache_tree
);
9275 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
9276 btrfs_put_block_group(cache
);
9279 update_global_block_rsv(root
->fs_info
);
9281 spin_lock(&cache
->space_info
->lock
);
9282 cache
->space_info
->bytes_readonly
+= cache
->bytes_super
;
9283 spin_unlock(&cache
->space_info
->lock
);
9285 __link_block_group(cache
->space_info
, cache
);
9287 list_add_tail(&cache
->bg_list
, &trans
->new_bgs
);
9289 set_avail_alloc_bits(extent_root
->fs_info
, type
);
9294 static void clear_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
9296 u64 extra_flags
= chunk_to_extended(flags
) &
9297 BTRFS_EXTENDED_PROFILE_MASK
;
9299 write_seqlock(&fs_info
->profiles_lock
);
9300 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
9301 fs_info
->avail_data_alloc_bits
&= ~extra_flags
;
9302 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
9303 fs_info
->avail_metadata_alloc_bits
&= ~extra_flags
;
9304 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
9305 fs_info
->avail_system_alloc_bits
&= ~extra_flags
;
9306 write_sequnlock(&fs_info
->profiles_lock
);
9309 int btrfs_remove_block_group(struct btrfs_trans_handle
*trans
,
9310 struct btrfs_root
*root
, u64 group_start
)
9312 struct btrfs_path
*path
;
9313 struct btrfs_block_group_cache
*block_group
;
9314 struct btrfs_free_cluster
*cluster
;
9315 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
9316 struct btrfs_key key
;
9317 struct inode
*inode
;
9318 struct kobject
*kobj
= NULL
;
9322 struct btrfs_caching_control
*caching_ctl
= NULL
;
9324 root
= root
->fs_info
->extent_root
;
9326 block_group
= btrfs_lookup_block_group(root
->fs_info
, group_start
);
9327 BUG_ON(!block_group
);
9328 BUG_ON(!block_group
->ro
);
9331 * Free the reserved super bytes from this block group before
9334 free_excluded_extents(root
, block_group
);
9336 memcpy(&key
, &block_group
->key
, sizeof(key
));
9337 index
= get_block_group_index(block_group
);
9338 if (block_group
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
9339 BTRFS_BLOCK_GROUP_RAID1
|
9340 BTRFS_BLOCK_GROUP_RAID10
))
9345 /* make sure this block group isn't part of an allocation cluster */
9346 cluster
= &root
->fs_info
->data_alloc_cluster
;
9347 spin_lock(&cluster
->refill_lock
);
9348 btrfs_return_cluster_to_free_space(block_group
, cluster
);
9349 spin_unlock(&cluster
->refill_lock
);
9352 * make sure this block group isn't part of a metadata
9353 * allocation cluster
9355 cluster
= &root
->fs_info
->meta_alloc_cluster
;
9356 spin_lock(&cluster
->refill_lock
);
9357 btrfs_return_cluster_to_free_space(block_group
, cluster
);
9358 spin_unlock(&cluster
->refill_lock
);
9360 path
= btrfs_alloc_path();
9366 inode
= lookup_free_space_inode(tree_root
, block_group
, path
);
9367 if (!IS_ERR(inode
)) {
9368 ret
= btrfs_orphan_add(trans
, inode
);
9370 btrfs_add_delayed_iput(inode
);
9374 /* One for the block groups ref */
9375 spin_lock(&block_group
->lock
);
9376 if (block_group
->iref
) {
9377 block_group
->iref
= 0;
9378 block_group
->inode
= NULL
;
9379 spin_unlock(&block_group
->lock
);
9382 spin_unlock(&block_group
->lock
);
9384 /* One for our lookup ref */
9385 btrfs_add_delayed_iput(inode
);
9388 key
.objectid
= BTRFS_FREE_SPACE_OBJECTID
;
9389 key
.offset
= block_group
->key
.objectid
;
9392 ret
= btrfs_search_slot(trans
, tree_root
, &key
, path
, -1, 1);
9396 btrfs_release_path(path
);
9398 ret
= btrfs_del_item(trans
, tree_root
, path
);
9401 btrfs_release_path(path
);
9404 spin_lock(&root
->fs_info
->block_group_cache_lock
);
9405 rb_erase(&block_group
->cache_node
,
9406 &root
->fs_info
->block_group_cache_tree
);
9407 RB_CLEAR_NODE(&block_group
->cache_node
);
9409 if (root
->fs_info
->first_logical_byte
== block_group
->key
.objectid
)
9410 root
->fs_info
->first_logical_byte
= (u64
)-1;
9411 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
9413 down_write(&block_group
->space_info
->groups_sem
);
9415 * we must use list_del_init so people can check to see if they
9416 * are still on the list after taking the semaphore
9418 list_del_init(&block_group
->list
);
9419 list_del_init(&block_group
->ro_list
);
9420 if (list_empty(&block_group
->space_info
->block_groups
[index
])) {
9421 kobj
= block_group
->space_info
->block_group_kobjs
[index
];
9422 block_group
->space_info
->block_group_kobjs
[index
] = NULL
;
9423 clear_avail_alloc_bits(root
->fs_info
, block_group
->flags
);
9425 up_write(&block_group
->space_info
->groups_sem
);
9431 if (block_group
->has_caching_ctl
)
9432 caching_ctl
= get_caching_control(block_group
);
9433 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
9434 wait_block_group_cache_done(block_group
);
9435 if (block_group
->has_caching_ctl
) {
9436 down_write(&root
->fs_info
->commit_root_sem
);
9438 struct btrfs_caching_control
*ctl
;
9440 list_for_each_entry(ctl
,
9441 &root
->fs_info
->caching_block_groups
, list
)
9442 if (ctl
->block_group
== block_group
) {
9444 atomic_inc(&caching_ctl
->count
);
9449 list_del_init(&caching_ctl
->list
);
9450 up_write(&root
->fs_info
->commit_root_sem
);
9452 /* Once for the caching bgs list and once for us. */
9453 put_caching_control(caching_ctl
);
9454 put_caching_control(caching_ctl
);
9458 btrfs_remove_free_space_cache(block_group
);
9460 spin_lock(&block_group
->space_info
->lock
);
9461 block_group
->space_info
->total_bytes
-= block_group
->key
.offset
;
9462 block_group
->space_info
->bytes_readonly
-= block_group
->key
.offset
;
9463 block_group
->space_info
->disk_total
-= block_group
->key
.offset
* factor
;
9464 spin_unlock(&block_group
->space_info
->lock
);
9466 memcpy(&key
, &block_group
->key
, sizeof(key
));
9468 btrfs_put_block_group(block_group
);
9469 btrfs_put_block_group(block_group
);
9471 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
9477 ret
= btrfs_del_item(trans
, root
, path
);
9479 btrfs_free_path(path
);
9484 * Process the unused_bgs list and remove any that don't have any allocated
9485 * space inside of them.
9487 void btrfs_delete_unused_bgs(struct btrfs_fs_info
*fs_info
)
9489 struct btrfs_block_group_cache
*block_group
;
9490 struct btrfs_space_info
*space_info
;
9491 struct btrfs_root
*root
= fs_info
->extent_root
;
9492 struct btrfs_trans_handle
*trans
;
9498 spin_lock(&fs_info
->unused_bgs_lock
);
9499 while (!list_empty(&fs_info
->unused_bgs
)) {
9502 block_group
= list_first_entry(&fs_info
->unused_bgs
,
9503 struct btrfs_block_group_cache
,
9505 space_info
= block_group
->space_info
;
9506 list_del_init(&block_group
->bg_list
);
9507 if (ret
|| btrfs_mixed_space_info(space_info
)) {
9508 btrfs_put_block_group(block_group
);
9511 spin_unlock(&fs_info
->unused_bgs_lock
);
9513 /* Don't want to race with allocators so take the groups_sem */
9514 down_write(&space_info
->groups_sem
);
9515 spin_lock(&block_group
->lock
);
9516 if (block_group
->reserved
||
9517 btrfs_block_group_used(&block_group
->item
) ||
9520 * We want to bail if we made new allocations or have
9521 * outstanding allocations in this block group. We do
9522 * the ro check in case balance is currently acting on
9525 spin_unlock(&block_group
->lock
);
9526 up_write(&space_info
->groups_sem
);
9529 spin_unlock(&block_group
->lock
);
9531 /* We don't want to force the issue, only flip if it's ok. */
9532 ret
= set_block_group_ro(block_group
, 0);
9533 up_write(&space_info
->groups_sem
);
9540 * Want to do this before we do anything else so we can recover
9541 * properly if we fail to join the transaction.
9543 trans
= btrfs_join_transaction(root
);
9544 if (IS_ERR(trans
)) {
9545 btrfs_set_block_group_rw(root
, block_group
);
9546 ret
= PTR_ERR(trans
);
9551 * We could have pending pinned extents for this block group,
9552 * just delete them, we don't care about them anymore.
9554 start
= block_group
->key
.objectid
;
9555 end
= start
+ block_group
->key
.offset
- 1;
9556 ret
= clear_extent_bits(&fs_info
->freed_extents
[0], start
, end
,
9557 EXTENT_DIRTY
, GFP_NOFS
);
9559 btrfs_set_block_group_rw(root
, block_group
);
9562 ret
= clear_extent_bits(&fs_info
->freed_extents
[1], start
, end
,
9563 EXTENT_DIRTY
, GFP_NOFS
);
9565 btrfs_set_block_group_rw(root
, block_group
);
9569 /* Reset pinned so btrfs_put_block_group doesn't complain */
9570 block_group
->pinned
= 0;
9573 * Btrfs_remove_chunk will abort the transaction if things go
9576 ret
= btrfs_remove_chunk(trans
, root
,
9577 block_group
->key
.objectid
);
9579 btrfs_end_transaction(trans
, root
);
9581 btrfs_put_block_group(block_group
);
9582 spin_lock(&fs_info
->unused_bgs_lock
);
9584 spin_unlock(&fs_info
->unused_bgs_lock
);
9587 int btrfs_init_space_info(struct btrfs_fs_info
*fs_info
)
9589 struct btrfs_space_info
*space_info
;
9590 struct btrfs_super_block
*disk_super
;
9596 disk_super
= fs_info
->super_copy
;
9597 if (!btrfs_super_root(disk_super
))
9600 features
= btrfs_super_incompat_flags(disk_super
);
9601 if (features
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
)
9604 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
9605 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9610 flags
= BTRFS_BLOCK_GROUP_METADATA
| BTRFS_BLOCK_GROUP_DATA
;
9611 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9613 flags
= BTRFS_BLOCK_GROUP_METADATA
;
9614 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9618 flags
= BTRFS_BLOCK_GROUP_DATA
;
9619 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9625 int btrfs_error_unpin_extent_range(struct btrfs_root
*root
, u64 start
, u64 end
)
9627 return unpin_extent_range(root
, start
, end
);
9630 int btrfs_error_discard_extent(struct btrfs_root
*root
, u64 bytenr
,
9631 u64 num_bytes
, u64
*actual_bytes
)
9633 return btrfs_discard_extent(root
, bytenr
, num_bytes
, actual_bytes
);
9636 int btrfs_trim_fs(struct btrfs_root
*root
, struct fstrim_range
*range
)
9638 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
9639 struct btrfs_block_group_cache
*cache
= NULL
;
9644 u64 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
9648 * try to trim all FS space, our block group may start from non-zero.
9650 if (range
->len
== total_bytes
)
9651 cache
= btrfs_lookup_first_block_group(fs_info
, range
->start
);
9653 cache
= btrfs_lookup_block_group(fs_info
, range
->start
);
9656 if (cache
->key
.objectid
>= (range
->start
+ range
->len
)) {
9657 btrfs_put_block_group(cache
);
9661 start
= max(range
->start
, cache
->key
.objectid
);
9662 end
= min(range
->start
+ range
->len
,
9663 cache
->key
.objectid
+ cache
->key
.offset
);
9665 if (end
- start
>= range
->minlen
) {
9666 if (!block_group_cache_done(cache
)) {
9667 ret
= cache_block_group(cache
, 0);
9669 btrfs_put_block_group(cache
);
9672 ret
= wait_block_group_cache_done(cache
);
9674 btrfs_put_block_group(cache
);
9678 ret
= btrfs_trim_block_group(cache
,
9684 trimmed
+= group_trimmed
;
9686 btrfs_put_block_group(cache
);
9691 cache
= next_block_group(fs_info
->tree_root
, cache
);
9694 range
->len
= trimmed
;
9699 * btrfs_{start,end}_write_no_snapshoting() are similar to
9700 * mnt_{want,drop}_write(), they are used to prevent some tasks from writing
9701 * data into the page cache through nocow before the subvolume is snapshoted,
9702 * but flush the data into disk after the snapshot creation, or to prevent
9703 * operations while snapshoting is ongoing and that cause the snapshot to be
9704 * inconsistent (writes followed by expanding truncates for example).
9706 void btrfs_end_write_no_snapshoting(struct btrfs_root
*root
)
9708 percpu_counter_dec(&root
->subv_writers
->counter
);
9710 * Make sure counter is updated before we wake up
9714 if (waitqueue_active(&root
->subv_writers
->wait
))
9715 wake_up(&root
->subv_writers
->wait
);
9718 int btrfs_start_write_no_snapshoting(struct btrfs_root
*root
)
9720 if (atomic_read(&root
->will_be_snapshoted
))
9723 percpu_counter_inc(&root
->subv_writers
->counter
);
9725 * Make sure counter is updated before we check for snapshot creation.
9728 if (atomic_read(&root
->will_be_snapshoted
)) {
9729 btrfs_end_write_no_snapshoting(root
);