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_trans_handle
*trans
,
78 struct btrfs_root
*root
, u64 bytenr
,
79 u64 num_bytes
, int alloc
);
80 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
81 struct btrfs_root
*root
,
82 struct btrfs_delayed_ref_node
*node
, u64 parent
,
83 u64 root_objectid
, u64 owner_objectid
,
84 u64 owner_offset
, int refs_to_drop
,
85 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
);
99 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
,
100 struct btrfs_root
*extent_root
, u64 flags
,
102 static int find_next_key(struct btrfs_path
*path
, int level
,
103 struct btrfs_key
*key
);
104 static void dump_space_info(struct btrfs_space_info
*info
, u64 bytes
,
105 int dump_block_groups
);
106 static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache
*cache
,
107 u64 num_bytes
, int reserve
,
109 static int block_rsv_use_bytes(struct btrfs_block_rsv
*block_rsv
,
111 int btrfs_pin_extent(struct btrfs_root
*root
,
112 u64 bytenr
, u64 num_bytes
, int reserved
);
115 block_group_cache_done(struct btrfs_block_group_cache
*cache
)
118 return cache
->cached
== BTRFS_CACHE_FINISHED
||
119 cache
->cached
== BTRFS_CACHE_ERROR
;
122 static int block_group_bits(struct btrfs_block_group_cache
*cache
, u64 bits
)
124 return (cache
->flags
& bits
) == bits
;
127 static void btrfs_get_block_group(struct btrfs_block_group_cache
*cache
)
129 atomic_inc(&cache
->count
);
132 void btrfs_put_block_group(struct btrfs_block_group_cache
*cache
)
134 if (atomic_dec_and_test(&cache
->count
)) {
135 WARN_ON(cache
->pinned
> 0);
136 WARN_ON(cache
->reserved
> 0);
137 kfree(cache
->free_space_ctl
);
143 * this adds the block group to the fs_info rb tree for the block group
146 static int btrfs_add_block_group_cache(struct btrfs_fs_info
*info
,
147 struct btrfs_block_group_cache
*block_group
)
150 struct rb_node
*parent
= NULL
;
151 struct btrfs_block_group_cache
*cache
;
153 spin_lock(&info
->block_group_cache_lock
);
154 p
= &info
->block_group_cache_tree
.rb_node
;
158 cache
= rb_entry(parent
, struct btrfs_block_group_cache
,
160 if (block_group
->key
.objectid
< cache
->key
.objectid
) {
162 } else if (block_group
->key
.objectid
> cache
->key
.objectid
) {
165 spin_unlock(&info
->block_group_cache_lock
);
170 rb_link_node(&block_group
->cache_node
, parent
, p
);
171 rb_insert_color(&block_group
->cache_node
,
172 &info
->block_group_cache_tree
);
174 if (info
->first_logical_byte
> block_group
->key
.objectid
)
175 info
->first_logical_byte
= block_group
->key
.objectid
;
177 spin_unlock(&info
->block_group_cache_lock
);
183 * This will return the block group at or after bytenr if contains is 0, else
184 * it will return the block group that contains the bytenr
186 static struct btrfs_block_group_cache
*
187 block_group_cache_tree_search(struct btrfs_fs_info
*info
, u64 bytenr
,
190 struct btrfs_block_group_cache
*cache
, *ret
= NULL
;
194 spin_lock(&info
->block_group_cache_lock
);
195 n
= info
->block_group_cache_tree
.rb_node
;
198 cache
= rb_entry(n
, struct btrfs_block_group_cache
,
200 end
= cache
->key
.objectid
+ cache
->key
.offset
- 1;
201 start
= cache
->key
.objectid
;
203 if (bytenr
< start
) {
204 if (!contains
&& (!ret
|| start
< ret
->key
.objectid
))
207 } else if (bytenr
> start
) {
208 if (contains
&& bytenr
<= end
) {
219 btrfs_get_block_group(ret
);
220 if (bytenr
== 0 && info
->first_logical_byte
> ret
->key
.objectid
)
221 info
->first_logical_byte
= ret
->key
.objectid
;
223 spin_unlock(&info
->block_group_cache_lock
);
228 static int add_excluded_extent(struct btrfs_root
*root
,
229 u64 start
, u64 num_bytes
)
231 u64 end
= start
+ num_bytes
- 1;
232 set_extent_bits(&root
->fs_info
->freed_extents
[0],
233 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
234 set_extent_bits(&root
->fs_info
->freed_extents
[1],
235 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
239 static void free_excluded_extents(struct btrfs_root
*root
,
240 struct btrfs_block_group_cache
*cache
)
244 start
= cache
->key
.objectid
;
245 end
= start
+ cache
->key
.offset
- 1;
247 clear_extent_bits(&root
->fs_info
->freed_extents
[0],
248 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
249 clear_extent_bits(&root
->fs_info
->freed_extents
[1],
250 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
253 static int exclude_super_stripes(struct btrfs_root
*root
,
254 struct btrfs_block_group_cache
*cache
)
261 if (cache
->key
.objectid
< BTRFS_SUPER_INFO_OFFSET
) {
262 stripe_len
= BTRFS_SUPER_INFO_OFFSET
- cache
->key
.objectid
;
263 cache
->bytes_super
+= stripe_len
;
264 ret
= add_excluded_extent(root
, cache
->key
.objectid
,
270 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
271 bytenr
= btrfs_sb_offset(i
);
272 ret
= btrfs_rmap_block(&root
->fs_info
->mapping_tree
,
273 cache
->key
.objectid
, bytenr
,
274 0, &logical
, &nr
, &stripe_len
);
281 if (logical
[nr
] > cache
->key
.objectid
+
285 if (logical
[nr
] + stripe_len
<= cache
->key
.objectid
)
289 if (start
< cache
->key
.objectid
) {
290 start
= cache
->key
.objectid
;
291 len
= (logical
[nr
] + stripe_len
) - start
;
293 len
= min_t(u64
, stripe_len
,
294 cache
->key
.objectid
+
295 cache
->key
.offset
- start
);
298 cache
->bytes_super
+= len
;
299 ret
= add_excluded_extent(root
, start
, len
);
311 static struct btrfs_caching_control
*
312 get_caching_control(struct btrfs_block_group_cache
*cache
)
314 struct btrfs_caching_control
*ctl
;
316 spin_lock(&cache
->lock
);
317 if (!cache
->caching_ctl
) {
318 spin_unlock(&cache
->lock
);
322 ctl
= cache
->caching_ctl
;
323 atomic_inc(&ctl
->count
);
324 spin_unlock(&cache
->lock
);
328 static void put_caching_control(struct btrfs_caching_control
*ctl
)
330 if (atomic_dec_and_test(&ctl
->count
))
334 #ifdef CONFIG_BTRFS_DEBUG
335 static void fragment_free_space(struct btrfs_root
*root
,
336 struct btrfs_block_group_cache
*block_group
)
338 u64 start
= block_group
->key
.objectid
;
339 u64 len
= block_group
->key
.offset
;
340 u64 chunk
= block_group
->flags
& BTRFS_BLOCK_GROUP_METADATA
?
341 root
->nodesize
: root
->sectorsize
;
342 u64 step
= chunk
<< 1;
344 while (len
> chunk
) {
345 btrfs_remove_free_space(block_group
, start
, chunk
);
356 * this is only called by cache_block_group, since we could have freed extents
357 * we need to check the pinned_extents for any extents that can't be used yet
358 * since their free space will be released as soon as the transaction commits.
360 static u64
add_new_free_space(struct btrfs_block_group_cache
*block_group
,
361 struct btrfs_fs_info
*info
, u64 start
, u64 end
)
363 u64 extent_start
, extent_end
, size
, total_added
= 0;
366 while (start
< end
) {
367 ret
= find_first_extent_bit(info
->pinned_extents
, start
,
368 &extent_start
, &extent_end
,
369 EXTENT_DIRTY
| EXTENT_UPTODATE
,
374 if (extent_start
<= start
) {
375 start
= extent_end
+ 1;
376 } else if (extent_start
> start
&& extent_start
< end
) {
377 size
= extent_start
- start
;
379 ret
= btrfs_add_free_space(block_group
, start
,
381 BUG_ON(ret
); /* -ENOMEM or logic error */
382 start
= extent_end
+ 1;
391 ret
= btrfs_add_free_space(block_group
, start
, size
);
392 BUG_ON(ret
); /* -ENOMEM or logic error */
398 static noinline
void caching_thread(struct btrfs_work
*work
)
400 struct btrfs_block_group_cache
*block_group
;
401 struct btrfs_fs_info
*fs_info
;
402 struct btrfs_caching_control
*caching_ctl
;
403 struct btrfs_root
*extent_root
;
404 struct btrfs_path
*path
;
405 struct extent_buffer
*leaf
;
406 struct btrfs_key key
;
413 caching_ctl
= container_of(work
, struct btrfs_caching_control
, work
);
414 block_group
= caching_ctl
->block_group
;
415 fs_info
= block_group
->fs_info
;
416 extent_root
= fs_info
->extent_root
;
418 path
= btrfs_alloc_path();
422 last
= max_t(u64
, block_group
->key
.objectid
, BTRFS_SUPER_INFO_OFFSET
);
424 #ifdef CONFIG_BTRFS_DEBUG
426 * If we're fragmenting we don't want to make anybody think we can
427 * allocate from this block group until we've had a chance to fragment
430 if (btrfs_should_fragment_free_space(extent_root
, block_group
))
434 * We don't want to deadlock with somebody trying to allocate a new
435 * extent for the extent root while also trying to search the extent
436 * root to add free space. So we skip locking and search the commit
437 * root, since its read-only
439 path
->skip_locking
= 1;
440 path
->search_commit_root
= 1;
445 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
447 mutex_lock(&caching_ctl
->mutex
);
448 /* need to make sure the commit_root doesn't disappear */
449 down_read(&fs_info
->commit_root_sem
);
452 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
456 leaf
= path
->nodes
[0];
457 nritems
= btrfs_header_nritems(leaf
);
460 if (btrfs_fs_closing(fs_info
) > 1) {
465 if (path
->slots
[0] < nritems
) {
466 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
468 ret
= find_next_key(path
, 0, &key
);
472 if (need_resched() ||
473 rwsem_is_contended(&fs_info
->commit_root_sem
)) {
475 caching_ctl
->progress
= last
;
476 btrfs_release_path(path
);
477 up_read(&fs_info
->commit_root_sem
);
478 mutex_unlock(&caching_ctl
->mutex
);
483 ret
= btrfs_next_leaf(extent_root
, path
);
488 leaf
= path
->nodes
[0];
489 nritems
= btrfs_header_nritems(leaf
);
493 if (key
.objectid
< last
) {
496 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
499 caching_ctl
->progress
= last
;
500 btrfs_release_path(path
);
504 if (key
.objectid
< block_group
->key
.objectid
) {
509 if (key
.objectid
>= block_group
->key
.objectid
+
510 block_group
->key
.offset
)
513 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
||
514 key
.type
== BTRFS_METADATA_ITEM_KEY
) {
515 total_found
+= add_new_free_space(block_group
,
518 if (key
.type
== BTRFS_METADATA_ITEM_KEY
)
519 last
= key
.objectid
+
520 fs_info
->tree_root
->nodesize
;
522 last
= key
.objectid
+ key
.offset
;
524 if (total_found
> (1024 * 1024 * 2)) {
527 wake_up(&caching_ctl
->wait
);
534 total_found
+= add_new_free_space(block_group
, fs_info
, last
,
535 block_group
->key
.objectid
+
536 block_group
->key
.offset
);
537 spin_lock(&block_group
->lock
);
538 block_group
->caching_ctl
= NULL
;
539 block_group
->cached
= BTRFS_CACHE_FINISHED
;
540 spin_unlock(&block_group
->lock
);
542 #ifdef CONFIG_BTRFS_DEBUG
543 if (btrfs_should_fragment_free_space(extent_root
, block_group
)) {
546 spin_lock(&block_group
->space_info
->lock
);
547 spin_lock(&block_group
->lock
);
548 bytes_used
= block_group
->key
.offset
-
549 btrfs_block_group_used(&block_group
->item
);
550 block_group
->space_info
->bytes_used
+= bytes_used
>> 1;
551 spin_unlock(&block_group
->lock
);
552 spin_unlock(&block_group
->space_info
->lock
);
553 fragment_free_space(extent_root
, block_group
);
557 caching_ctl
->progress
= (u64
)-1;
559 btrfs_free_path(path
);
560 up_read(&fs_info
->commit_root_sem
);
562 free_excluded_extents(extent_root
, block_group
);
564 mutex_unlock(&caching_ctl
->mutex
);
567 spin_lock(&block_group
->lock
);
568 block_group
->caching_ctl
= NULL
;
569 block_group
->cached
= BTRFS_CACHE_ERROR
;
570 spin_unlock(&block_group
->lock
);
572 wake_up(&caching_ctl
->wait
);
574 put_caching_control(caching_ctl
);
575 btrfs_put_block_group(block_group
);
578 static int cache_block_group(struct btrfs_block_group_cache
*cache
,
582 struct btrfs_fs_info
*fs_info
= cache
->fs_info
;
583 struct btrfs_caching_control
*caching_ctl
;
586 caching_ctl
= kzalloc(sizeof(*caching_ctl
), GFP_NOFS
);
590 INIT_LIST_HEAD(&caching_ctl
->list
);
591 mutex_init(&caching_ctl
->mutex
);
592 init_waitqueue_head(&caching_ctl
->wait
);
593 caching_ctl
->block_group
= cache
;
594 caching_ctl
->progress
= cache
->key
.objectid
;
595 atomic_set(&caching_ctl
->count
, 1);
596 btrfs_init_work(&caching_ctl
->work
, btrfs_cache_helper
,
597 caching_thread
, NULL
, NULL
);
599 spin_lock(&cache
->lock
);
601 * This should be a rare occasion, but this could happen I think in the
602 * case where one thread starts to load the space cache info, and then
603 * some other thread starts a transaction commit which tries to do an
604 * allocation while the other thread is still loading the space cache
605 * info. The previous loop should have kept us from choosing this block
606 * group, but if we've moved to the state where we will wait on caching
607 * block groups we need to first check if we're doing a fast load here,
608 * so we can wait for it to finish, otherwise we could end up allocating
609 * from a block group who's cache gets evicted for one reason or
612 while (cache
->cached
== BTRFS_CACHE_FAST
) {
613 struct btrfs_caching_control
*ctl
;
615 ctl
= cache
->caching_ctl
;
616 atomic_inc(&ctl
->count
);
617 prepare_to_wait(&ctl
->wait
, &wait
, TASK_UNINTERRUPTIBLE
);
618 spin_unlock(&cache
->lock
);
622 finish_wait(&ctl
->wait
, &wait
);
623 put_caching_control(ctl
);
624 spin_lock(&cache
->lock
);
627 if (cache
->cached
!= BTRFS_CACHE_NO
) {
628 spin_unlock(&cache
->lock
);
632 WARN_ON(cache
->caching_ctl
);
633 cache
->caching_ctl
= caching_ctl
;
634 cache
->cached
= BTRFS_CACHE_FAST
;
635 spin_unlock(&cache
->lock
);
637 if (fs_info
->mount_opt
& BTRFS_MOUNT_SPACE_CACHE
) {
638 mutex_lock(&caching_ctl
->mutex
);
639 ret
= load_free_space_cache(fs_info
, cache
);
641 spin_lock(&cache
->lock
);
643 cache
->caching_ctl
= NULL
;
644 cache
->cached
= BTRFS_CACHE_FINISHED
;
645 cache
->last_byte_to_unpin
= (u64
)-1;
646 caching_ctl
->progress
= (u64
)-1;
648 if (load_cache_only
) {
649 cache
->caching_ctl
= NULL
;
650 cache
->cached
= BTRFS_CACHE_NO
;
652 cache
->cached
= BTRFS_CACHE_STARTED
;
653 cache
->has_caching_ctl
= 1;
656 spin_unlock(&cache
->lock
);
657 #ifdef CONFIG_BTRFS_DEBUG
659 btrfs_should_fragment_free_space(fs_info
->extent_root
,
663 spin_lock(&cache
->space_info
->lock
);
664 spin_lock(&cache
->lock
);
665 bytes_used
= cache
->key
.offset
-
666 btrfs_block_group_used(&cache
->item
);
667 cache
->space_info
->bytes_used
+= bytes_used
>> 1;
668 spin_unlock(&cache
->lock
);
669 spin_unlock(&cache
->space_info
->lock
);
670 fragment_free_space(fs_info
->extent_root
, cache
);
673 mutex_unlock(&caching_ctl
->mutex
);
675 wake_up(&caching_ctl
->wait
);
677 put_caching_control(caching_ctl
);
678 free_excluded_extents(fs_info
->extent_root
, cache
);
683 * We are not going to do the fast caching, set cached to the
684 * appropriate value and wakeup any waiters.
686 spin_lock(&cache
->lock
);
687 if (load_cache_only
) {
688 cache
->caching_ctl
= NULL
;
689 cache
->cached
= BTRFS_CACHE_NO
;
691 cache
->cached
= BTRFS_CACHE_STARTED
;
692 cache
->has_caching_ctl
= 1;
694 spin_unlock(&cache
->lock
);
695 wake_up(&caching_ctl
->wait
);
698 if (load_cache_only
) {
699 put_caching_control(caching_ctl
);
703 down_write(&fs_info
->commit_root_sem
);
704 atomic_inc(&caching_ctl
->count
);
705 list_add_tail(&caching_ctl
->list
, &fs_info
->caching_block_groups
);
706 up_write(&fs_info
->commit_root_sem
);
708 btrfs_get_block_group(cache
);
710 btrfs_queue_work(fs_info
->caching_workers
, &caching_ctl
->work
);
716 * return the block group that starts at or after bytenr
718 static struct btrfs_block_group_cache
*
719 btrfs_lookup_first_block_group(struct btrfs_fs_info
*info
, u64 bytenr
)
721 struct btrfs_block_group_cache
*cache
;
723 cache
= block_group_cache_tree_search(info
, bytenr
, 0);
729 * return the block group that contains the given bytenr
731 struct btrfs_block_group_cache
*btrfs_lookup_block_group(
732 struct btrfs_fs_info
*info
,
735 struct btrfs_block_group_cache
*cache
;
737 cache
= block_group_cache_tree_search(info
, bytenr
, 1);
742 static struct btrfs_space_info
*__find_space_info(struct btrfs_fs_info
*info
,
745 struct list_head
*head
= &info
->space_info
;
746 struct btrfs_space_info
*found
;
748 flags
&= BTRFS_BLOCK_GROUP_TYPE_MASK
;
751 list_for_each_entry_rcu(found
, head
, list
) {
752 if (found
->flags
& flags
) {
762 * after adding space to the filesystem, we need to clear the full flags
763 * on all the space infos.
765 void btrfs_clear_space_info_full(struct btrfs_fs_info
*info
)
767 struct list_head
*head
= &info
->space_info
;
768 struct btrfs_space_info
*found
;
771 list_for_each_entry_rcu(found
, head
, list
)
776 /* simple helper to search for an existing data extent at a given offset */
777 int btrfs_lookup_data_extent(struct btrfs_root
*root
, u64 start
, u64 len
)
780 struct btrfs_key key
;
781 struct btrfs_path
*path
;
783 path
= btrfs_alloc_path();
787 key
.objectid
= start
;
789 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
790 ret
= btrfs_search_slot(NULL
, root
->fs_info
->extent_root
, &key
, path
,
792 btrfs_free_path(path
);
797 * helper function to lookup reference count and flags of a tree block.
799 * the head node for delayed ref is used to store the sum of all the
800 * reference count modifications queued up in the rbtree. the head
801 * node may also store the extent flags to set. This way you can check
802 * to see what the reference count and extent flags would be if all of
803 * the delayed refs are not processed.
805 int btrfs_lookup_extent_info(struct btrfs_trans_handle
*trans
,
806 struct btrfs_root
*root
, u64 bytenr
,
807 u64 offset
, int metadata
, u64
*refs
, u64
*flags
)
809 struct btrfs_delayed_ref_head
*head
;
810 struct btrfs_delayed_ref_root
*delayed_refs
;
811 struct btrfs_path
*path
;
812 struct btrfs_extent_item
*ei
;
813 struct extent_buffer
*leaf
;
814 struct btrfs_key key
;
821 * If we don't have skinny metadata, don't bother doing anything
824 if (metadata
&& !btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
)) {
825 offset
= root
->nodesize
;
829 path
= btrfs_alloc_path();
834 path
->skip_locking
= 1;
835 path
->search_commit_root
= 1;
839 key
.objectid
= bytenr
;
842 key
.type
= BTRFS_METADATA_ITEM_KEY
;
844 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
846 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
,
851 if (ret
> 0 && metadata
&& key
.type
== BTRFS_METADATA_ITEM_KEY
) {
852 if (path
->slots
[0]) {
854 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
856 if (key
.objectid
== bytenr
&&
857 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
858 key
.offset
== root
->nodesize
)
864 leaf
= path
->nodes
[0];
865 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
866 if (item_size
>= sizeof(*ei
)) {
867 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
868 struct btrfs_extent_item
);
869 num_refs
= btrfs_extent_refs(leaf
, ei
);
870 extent_flags
= btrfs_extent_flags(leaf
, ei
);
872 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
873 struct btrfs_extent_item_v0
*ei0
;
874 BUG_ON(item_size
!= sizeof(*ei0
));
875 ei0
= btrfs_item_ptr(leaf
, path
->slots
[0],
876 struct btrfs_extent_item_v0
);
877 num_refs
= btrfs_extent_refs_v0(leaf
, ei0
);
878 /* FIXME: this isn't correct for data */
879 extent_flags
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
884 BUG_ON(num_refs
== 0);
894 delayed_refs
= &trans
->transaction
->delayed_refs
;
895 spin_lock(&delayed_refs
->lock
);
896 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
898 if (!mutex_trylock(&head
->mutex
)) {
899 atomic_inc(&head
->node
.refs
);
900 spin_unlock(&delayed_refs
->lock
);
902 btrfs_release_path(path
);
905 * Mutex was contended, block until it's released and try
908 mutex_lock(&head
->mutex
);
909 mutex_unlock(&head
->mutex
);
910 btrfs_put_delayed_ref(&head
->node
);
913 spin_lock(&head
->lock
);
914 if (head
->extent_op
&& head
->extent_op
->update_flags
)
915 extent_flags
|= head
->extent_op
->flags_to_set
;
917 BUG_ON(num_refs
== 0);
919 num_refs
+= head
->node
.ref_mod
;
920 spin_unlock(&head
->lock
);
921 mutex_unlock(&head
->mutex
);
923 spin_unlock(&delayed_refs
->lock
);
925 WARN_ON(num_refs
== 0);
929 *flags
= extent_flags
;
931 btrfs_free_path(path
);
936 * Back reference rules. Back refs have three main goals:
938 * 1) differentiate between all holders of references to an extent so that
939 * when a reference is dropped we can make sure it was a valid reference
940 * before freeing the extent.
942 * 2) Provide enough information to quickly find the holders of an extent
943 * if we notice a given block is corrupted or bad.
945 * 3) Make it easy to migrate blocks for FS shrinking or storage pool
946 * maintenance. This is actually the same as #2, but with a slightly
947 * different use case.
949 * There are two kinds of back refs. The implicit back refs is optimized
950 * for pointers in non-shared tree blocks. For a given pointer in a block,
951 * back refs of this kind provide information about the block's owner tree
952 * and the pointer's key. These information allow us to find the block by
953 * b-tree searching. The full back refs is for pointers in tree blocks not
954 * referenced by their owner trees. The location of tree block is recorded
955 * in the back refs. Actually the full back refs is generic, and can be
956 * used in all cases the implicit back refs is used. The major shortcoming
957 * of the full back refs is its overhead. Every time a tree block gets
958 * COWed, we have to update back refs entry for all pointers in it.
960 * For a newly allocated tree block, we use implicit back refs for
961 * pointers in it. This means most tree related operations only involve
962 * implicit back refs. For a tree block created in old transaction, the
963 * only way to drop a reference to it is COW it. So we can detect the
964 * event that tree block loses its owner tree's reference and do the
965 * back refs conversion.
967 * When a tree block is COW'd through a tree, there are four cases:
969 * The reference count of the block is one and the tree is the block's
970 * owner tree. Nothing to do in this case.
972 * The reference count of the block is one and the tree is not the
973 * block's owner tree. In this case, full back refs is used for pointers
974 * in the block. Remove these full back refs, add implicit back refs for
975 * every pointers in the new block.
977 * The reference count of the block is greater than one and the tree is
978 * the block's owner tree. In this case, implicit back refs is used for
979 * pointers in the block. Add full back refs for every pointers in the
980 * block, increase lower level extents' reference counts. The original
981 * implicit back refs are entailed to the new block.
983 * The reference count of the block is greater than one and the tree is
984 * not the block's owner tree. Add implicit back refs for every pointer in
985 * the new block, increase lower level extents' reference count.
987 * Back Reference Key composing:
989 * The key objectid corresponds to the first byte in the extent,
990 * The key type is used to differentiate between types of back refs.
991 * There are different meanings of the key offset for different types
994 * File extents can be referenced by:
996 * - multiple snapshots, subvolumes, or different generations in one subvol
997 * - different files inside a single subvolume
998 * - different offsets inside a file (bookend extents in file.c)
1000 * The extent ref structure for the implicit back refs has fields for:
1002 * - Objectid of the subvolume root
1003 * - objectid of the file holding the reference
1004 * - original offset in the file
1005 * - how many bookend extents
1007 * The key offset for the implicit back refs is hash of the first
1010 * The extent ref structure for the full back refs has field for:
1012 * - number of pointers in the tree leaf
1014 * The key offset for the implicit back refs is the first byte of
1017 * When a file extent is allocated, The implicit back refs is used.
1018 * the fields are filled in:
1020 * (root_key.objectid, inode objectid, offset in file, 1)
1022 * When a file extent is removed file truncation, we find the
1023 * corresponding implicit back refs and check the following fields:
1025 * (btrfs_header_owner(leaf), inode objectid, offset in file)
1027 * Btree extents can be referenced by:
1029 * - Different subvolumes
1031 * Both the implicit back refs and the full back refs for tree blocks
1032 * only consist of key. The key offset for the implicit back refs is
1033 * objectid of block's owner tree. The key offset for the full back refs
1034 * is the first byte of parent block.
1036 * When implicit back refs is used, information about the lowest key and
1037 * level of the tree block are required. These information are stored in
1038 * tree block info structure.
1041 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1042 static int convert_extent_item_v0(struct btrfs_trans_handle
*trans
,
1043 struct btrfs_root
*root
,
1044 struct btrfs_path
*path
,
1045 u64 owner
, u32 extra_size
)
1047 struct btrfs_extent_item
*item
;
1048 struct btrfs_extent_item_v0
*ei0
;
1049 struct btrfs_extent_ref_v0
*ref0
;
1050 struct btrfs_tree_block_info
*bi
;
1051 struct extent_buffer
*leaf
;
1052 struct btrfs_key key
;
1053 struct btrfs_key found_key
;
1054 u32 new_size
= sizeof(*item
);
1058 leaf
= path
->nodes
[0];
1059 BUG_ON(btrfs_item_size_nr(leaf
, path
->slots
[0]) != sizeof(*ei0
));
1061 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1062 ei0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1063 struct btrfs_extent_item_v0
);
1064 refs
= btrfs_extent_refs_v0(leaf
, ei0
);
1066 if (owner
== (u64
)-1) {
1068 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
1069 ret
= btrfs_next_leaf(root
, path
);
1072 BUG_ON(ret
> 0); /* Corruption */
1073 leaf
= path
->nodes
[0];
1075 btrfs_item_key_to_cpu(leaf
, &found_key
,
1077 BUG_ON(key
.objectid
!= found_key
.objectid
);
1078 if (found_key
.type
!= BTRFS_EXTENT_REF_V0_KEY
) {
1082 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1083 struct btrfs_extent_ref_v0
);
1084 owner
= btrfs_ref_objectid_v0(leaf
, ref0
);
1088 btrfs_release_path(path
);
1090 if (owner
< BTRFS_FIRST_FREE_OBJECTID
)
1091 new_size
+= sizeof(*bi
);
1093 new_size
-= sizeof(*ei0
);
1094 ret
= btrfs_search_slot(trans
, root
, &key
, path
,
1095 new_size
+ extra_size
, 1);
1098 BUG_ON(ret
); /* Corruption */
1100 btrfs_extend_item(root
, path
, new_size
);
1102 leaf
= path
->nodes
[0];
1103 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1104 btrfs_set_extent_refs(leaf
, item
, refs
);
1105 /* FIXME: get real generation */
1106 btrfs_set_extent_generation(leaf
, item
, 0);
1107 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1108 btrfs_set_extent_flags(leaf
, item
,
1109 BTRFS_EXTENT_FLAG_TREE_BLOCK
|
1110 BTRFS_BLOCK_FLAG_FULL_BACKREF
);
1111 bi
= (struct btrfs_tree_block_info
*)(item
+ 1);
1112 /* FIXME: get first key of the block */
1113 memset_extent_buffer(leaf
, 0, (unsigned long)bi
, sizeof(*bi
));
1114 btrfs_set_tree_block_level(leaf
, bi
, (int)owner
);
1116 btrfs_set_extent_flags(leaf
, item
, BTRFS_EXTENT_FLAG_DATA
);
1118 btrfs_mark_buffer_dirty(leaf
);
1123 static u64
hash_extent_data_ref(u64 root_objectid
, u64 owner
, u64 offset
)
1125 u32 high_crc
= ~(u32
)0;
1126 u32 low_crc
= ~(u32
)0;
1129 lenum
= cpu_to_le64(root_objectid
);
1130 high_crc
= btrfs_crc32c(high_crc
, &lenum
, sizeof(lenum
));
1131 lenum
= cpu_to_le64(owner
);
1132 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
1133 lenum
= cpu_to_le64(offset
);
1134 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
1136 return ((u64
)high_crc
<< 31) ^ (u64
)low_crc
;
1139 static u64
hash_extent_data_ref_item(struct extent_buffer
*leaf
,
1140 struct btrfs_extent_data_ref
*ref
)
1142 return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf
, ref
),
1143 btrfs_extent_data_ref_objectid(leaf
, ref
),
1144 btrfs_extent_data_ref_offset(leaf
, ref
));
1147 static int match_extent_data_ref(struct extent_buffer
*leaf
,
1148 struct btrfs_extent_data_ref
*ref
,
1149 u64 root_objectid
, u64 owner
, u64 offset
)
1151 if (btrfs_extent_data_ref_root(leaf
, ref
) != root_objectid
||
1152 btrfs_extent_data_ref_objectid(leaf
, ref
) != owner
||
1153 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
1158 static noinline
int lookup_extent_data_ref(struct btrfs_trans_handle
*trans
,
1159 struct btrfs_root
*root
,
1160 struct btrfs_path
*path
,
1161 u64 bytenr
, u64 parent
,
1163 u64 owner
, u64 offset
)
1165 struct btrfs_key key
;
1166 struct btrfs_extent_data_ref
*ref
;
1167 struct extent_buffer
*leaf
;
1173 key
.objectid
= bytenr
;
1175 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1176 key
.offset
= parent
;
1178 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1179 key
.offset
= hash_extent_data_ref(root_objectid
,
1184 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1193 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1194 key
.type
= BTRFS_EXTENT_REF_V0_KEY
;
1195 btrfs_release_path(path
);
1196 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1207 leaf
= path
->nodes
[0];
1208 nritems
= btrfs_header_nritems(leaf
);
1210 if (path
->slots
[0] >= nritems
) {
1211 ret
= btrfs_next_leaf(root
, path
);
1217 leaf
= path
->nodes
[0];
1218 nritems
= btrfs_header_nritems(leaf
);
1222 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1223 if (key
.objectid
!= bytenr
||
1224 key
.type
!= BTRFS_EXTENT_DATA_REF_KEY
)
1227 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1228 struct btrfs_extent_data_ref
);
1230 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1233 btrfs_release_path(path
);
1245 static noinline
int insert_extent_data_ref(struct btrfs_trans_handle
*trans
,
1246 struct btrfs_root
*root
,
1247 struct btrfs_path
*path
,
1248 u64 bytenr
, u64 parent
,
1249 u64 root_objectid
, u64 owner
,
1250 u64 offset
, int refs_to_add
)
1252 struct btrfs_key key
;
1253 struct extent_buffer
*leaf
;
1258 key
.objectid
= bytenr
;
1260 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1261 key
.offset
= parent
;
1262 size
= sizeof(struct btrfs_shared_data_ref
);
1264 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1265 key
.offset
= hash_extent_data_ref(root_objectid
,
1267 size
= sizeof(struct btrfs_extent_data_ref
);
1270 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, size
);
1271 if (ret
&& ret
!= -EEXIST
)
1274 leaf
= path
->nodes
[0];
1276 struct btrfs_shared_data_ref
*ref
;
1277 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1278 struct btrfs_shared_data_ref
);
1280 btrfs_set_shared_data_ref_count(leaf
, ref
, refs_to_add
);
1282 num_refs
= btrfs_shared_data_ref_count(leaf
, ref
);
1283 num_refs
+= refs_to_add
;
1284 btrfs_set_shared_data_ref_count(leaf
, ref
, num_refs
);
1287 struct btrfs_extent_data_ref
*ref
;
1288 while (ret
== -EEXIST
) {
1289 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1290 struct btrfs_extent_data_ref
);
1291 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1294 btrfs_release_path(path
);
1296 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
1298 if (ret
&& ret
!= -EEXIST
)
1301 leaf
= path
->nodes
[0];
1303 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1304 struct btrfs_extent_data_ref
);
1306 btrfs_set_extent_data_ref_root(leaf
, ref
,
1308 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
1309 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
1310 btrfs_set_extent_data_ref_count(leaf
, ref
, refs_to_add
);
1312 num_refs
= btrfs_extent_data_ref_count(leaf
, ref
);
1313 num_refs
+= refs_to_add
;
1314 btrfs_set_extent_data_ref_count(leaf
, ref
, num_refs
);
1317 btrfs_mark_buffer_dirty(leaf
);
1320 btrfs_release_path(path
);
1324 static noinline
int remove_extent_data_ref(struct btrfs_trans_handle
*trans
,
1325 struct btrfs_root
*root
,
1326 struct btrfs_path
*path
,
1327 int refs_to_drop
, int *last_ref
)
1329 struct btrfs_key key
;
1330 struct btrfs_extent_data_ref
*ref1
= NULL
;
1331 struct btrfs_shared_data_ref
*ref2
= NULL
;
1332 struct extent_buffer
*leaf
;
1336 leaf
= path
->nodes
[0];
1337 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1339 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1340 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1341 struct btrfs_extent_data_ref
);
1342 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1343 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1344 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1345 struct btrfs_shared_data_ref
);
1346 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1347 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1348 } else if (key
.type
== BTRFS_EXTENT_REF_V0_KEY
) {
1349 struct btrfs_extent_ref_v0
*ref0
;
1350 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1351 struct btrfs_extent_ref_v0
);
1352 num_refs
= btrfs_ref_count_v0(leaf
, ref0
);
1358 BUG_ON(num_refs
< refs_to_drop
);
1359 num_refs
-= refs_to_drop
;
1361 if (num_refs
== 0) {
1362 ret
= btrfs_del_item(trans
, root
, path
);
1365 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
)
1366 btrfs_set_extent_data_ref_count(leaf
, ref1
, num_refs
);
1367 else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
)
1368 btrfs_set_shared_data_ref_count(leaf
, ref2
, num_refs
);
1369 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1371 struct btrfs_extent_ref_v0
*ref0
;
1372 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1373 struct btrfs_extent_ref_v0
);
1374 btrfs_set_ref_count_v0(leaf
, ref0
, num_refs
);
1377 btrfs_mark_buffer_dirty(leaf
);
1382 static noinline u32
extent_data_ref_count(struct btrfs_path
*path
,
1383 struct btrfs_extent_inline_ref
*iref
)
1385 struct btrfs_key key
;
1386 struct extent_buffer
*leaf
;
1387 struct btrfs_extent_data_ref
*ref1
;
1388 struct btrfs_shared_data_ref
*ref2
;
1391 leaf
= path
->nodes
[0];
1392 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1394 if (btrfs_extent_inline_ref_type(leaf
, iref
) ==
1395 BTRFS_EXTENT_DATA_REF_KEY
) {
1396 ref1
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1397 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1399 ref2
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1400 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1402 } else if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1403 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1404 struct btrfs_extent_data_ref
);
1405 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1406 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1407 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1408 struct btrfs_shared_data_ref
);
1409 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1410 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1411 } else if (key
.type
== BTRFS_EXTENT_REF_V0_KEY
) {
1412 struct btrfs_extent_ref_v0
*ref0
;
1413 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1414 struct btrfs_extent_ref_v0
);
1415 num_refs
= btrfs_ref_count_v0(leaf
, ref0
);
1423 static noinline
int lookup_tree_block_ref(struct btrfs_trans_handle
*trans
,
1424 struct btrfs_root
*root
,
1425 struct btrfs_path
*path
,
1426 u64 bytenr
, u64 parent
,
1429 struct btrfs_key key
;
1432 key
.objectid
= bytenr
;
1434 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1435 key
.offset
= parent
;
1437 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1438 key
.offset
= root_objectid
;
1441 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1444 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1445 if (ret
== -ENOENT
&& parent
) {
1446 btrfs_release_path(path
);
1447 key
.type
= BTRFS_EXTENT_REF_V0_KEY
;
1448 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1456 static noinline
int insert_tree_block_ref(struct btrfs_trans_handle
*trans
,
1457 struct btrfs_root
*root
,
1458 struct btrfs_path
*path
,
1459 u64 bytenr
, u64 parent
,
1462 struct btrfs_key key
;
1465 key
.objectid
= bytenr
;
1467 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1468 key
.offset
= parent
;
1470 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1471 key
.offset
= root_objectid
;
1474 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, 0);
1475 btrfs_release_path(path
);
1479 static inline int extent_ref_type(u64 parent
, u64 owner
)
1482 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1484 type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1486 type
= BTRFS_TREE_BLOCK_REF_KEY
;
1489 type
= BTRFS_SHARED_DATA_REF_KEY
;
1491 type
= BTRFS_EXTENT_DATA_REF_KEY
;
1496 static int find_next_key(struct btrfs_path
*path
, int level
,
1497 struct btrfs_key
*key
)
1500 for (; level
< BTRFS_MAX_LEVEL
; level
++) {
1501 if (!path
->nodes
[level
])
1503 if (path
->slots
[level
] + 1 >=
1504 btrfs_header_nritems(path
->nodes
[level
]))
1507 btrfs_item_key_to_cpu(path
->nodes
[level
], key
,
1508 path
->slots
[level
] + 1);
1510 btrfs_node_key_to_cpu(path
->nodes
[level
], key
,
1511 path
->slots
[level
] + 1);
1518 * look for inline back ref. if back ref is found, *ref_ret is set
1519 * to the address of inline back ref, and 0 is returned.
1521 * if back ref isn't found, *ref_ret is set to the address where it
1522 * should be inserted, and -ENOENT is returned.
1524 * if insert is true and there are too many inline back refs, the path
1525 * points to the extent item, and -EAGAIN is returned.
1527 * NOTE: inline back refs are ordered in the same way that back ref
1528 * items in the tree are ordered.
1530 static noinline_for_stack
1531 int lookup_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1532 struct btrfs_root
*root
,
1533 struct btrfs_path
*path
,
1534 struct btrfs_extent_inline_ref
**ref_ret
,
1535 u64 bytenr
, u64 num_bytes
,
1536 u64 parent
, u64 root_objectid
,
1537 u64 owner
, u64 offset
, int insert
)
1539 struct btrfs_key key
;
1540 struct extent_buffer
*leaf
;
1541 struct btrfs_extent_item
*ei
;
1542 struct btrfs_extent_inline_ref
*iref
;
1552 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
1555 key
.objectid
= bytenr
;
1556 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1557 key
.offset
= num_bytes
;
1559 want
= extent_ref_type(parent
, owner
);
1561 extra_size
= btrfs_extent_inline_ref_size(want
);
1562 path
->keep_locks
= 1;
1567 * Owner is our parent level, so we can just add one to get the level
1568 * for the block we are interested in.
1570 if (skinny_metadata
&& owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1571 key
.type
= BTRFS_METADATA_ITEM_KEY
;
1576 ret
= btrfs_search_slot(trans
, root
, &key
, path
, extra_size
, 1);
1583 * We may be a newly converted file system which still has the old fat
1584 * extent entries for metadata, so try and see if we have one of those.
1586 if (ret
> 0 && skinny_metadata
) {
1587 skinny_metadata
= false;
1588 if (path
->slots
[0]) {
1590 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
1592 if (key
.objectid
== bytenr
&&
1593 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
1594 key
.offset
== num_bytes
)
1598 key
.objectid
= bytenr
;
1599 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1600 key
.offset
= num_bytes
;
1601 btrfs_release_path(path
);
1606 if (ret
&& !insert
) {
1609 } else if (WARN_ON(ret
)) {
1614 leaf
= path
->nodes
[0];
1615 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1616 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1617 if (item_size
< sizeof(*ei
)) {
1622 ret
= convert_extent_item_v0(trans
, root
, path
, owner
,
1628 leaf
= path
->nodes
[0];
1629 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1632 BUG_ON(item_size
< sizeof(*ei
));
1634 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1635 flags
= btrfs_extent_flags(leaf
, ei
);
1637 ptr
= (unsigned long)(ei
+ 1);
1638 end
= (unsigned long)ei
+ item_size
;
1640 if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
&& !skinny_metadata
) {
1641 ptr
+= sizeof(struct btrfs_tree_block_info
);
1651 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1652 type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1656 ptr
+= btrfs_extent_inline_ref_size(type
);
1660 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1661 struct btrfs_extent_data_ref
*dref
;
1662 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1663 if (match_extent_data_ref(leaf
, dref
, root_objectid
,
1668 if (hash_extent_data_ref_item(leaf
, dref
) <
1669 hash_extent_data_ref(root_objectid
, owner
, offset
))
1673 ref_offset
= btrfs_extent_inline_ref_offset(leaf
, iref
);
1675 if (parent
== ref_offset
) {
1679 if (ref_offset
< parent
)
1682 if (root_objectid
== ref_offset
) {
1686 if (ref_offset
< root_objectid
)
1690 ptr
+= btrfs_extent_inline_ref_size(type
);
1692 if (err
== -ENOENT
&& insert
) {
1693 if (item_size
+ extra_size
>=
1694 BTRFS_MAX_EXTENT_ITEM_SIZE(root
)) {
1699 * To add new inline back ref, we have to make sure
1700 * there is no corresponding back ref item.
1701 * For simplicity, we just do not add new inline back
1702 * ref if there is any kind of item for this block
1704 if (find_next_key(path
, 0, &key
) == 0 &&
1705 key
.objectid
== bytenr
&&
1706 key
.type
< BTRFS_BLOCK_GROUP_ITEM_KEY
) {
1711 *ref_ret
= (struct btrfs_extent_inline_ref
*)ptr
;
1714 path
->keep_locks
= 0;
1715 btrfs_unlock_up_safe(path
, 1);
1721 * helper to add new inline back ref
1723 static noinline_for_stack
1724 void setup_inline_extent_backref(struct btrfs_root
*root
,
1725 struct btrfs_path
*path
,
1726 struct btrfs_extent_inline_ref
*iref
,
1727 u64 parent
, u64 root_objectid
,
1728 u64 owner
, u64 offset
, int refs_to_add
,
1729 struct btrfs_delayed_extent_op
*extent_op
)
1731 struct extent_buffer
*leaf
;
1732 struct btrfs_extent_item
*ei
;
1735 unsigned long item_offset
;
1740 leaf
= path
->nodes
[0];
1741 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1742 item_offset
= (unsigned long)iref
- (unsigned long)ei
;
1744 type
= extent_ref_type(parent
, owner
);
1745 size
= btrfs_extent_inline_ref_size(type
);
1747 btrfs_extend_item(root
, path
, size
);
1749 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1750 refs
= btrfs_extent_refs(leaf
, ei
);
1751 refs
+= refs_to_add
;
1752 btrfs_set_extent_refs(leaf
, ei
, refs
);
1754 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1756 ptr
= (unsigned long)ei
+ item_offset
;
1757 end
= (unsigned long)ei
+ btrfs_item_size_nr(leaf
, path
->slots
[0]);
1758 if (ptr
< end
- size
)
1759 memmove_extent_buffer(leaf
, ptr
+ size
, ptr
,
1762 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1763 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
1764 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1765 struct btrfs_extent_data_ref
*dref
;
1766 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1767 btrfs_set_extent_data_ref_root(leaf
, dref
, root_objectid
);
1768 btrfs_set_extent_data_ref_objectid(leaf
, dref
, owner
);
1769 btrfs_set_extent_data_ref_offset(leaf
, dref
, offset
);
1770 btrfs_set_extent_data_ref_count(leaf
, dref
, refs_to_add
);
1771 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1772 struct btrfs_shared_data_ref
*sref
;
1773 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1774 btrfs_set_shared_data_ref_count(leaf
, sref
, refs_to_add
);
1775 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1776 } else if (type
== BTRFS_SHARED_BLOCK_REF_KEY
) {
1777 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1779 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
1781 btrfs_mark_buffer_dirty(leaf
);
1784 static int lookup_extent_backref(struct btrfs_trans_handle
*trans
,
1785 struct btrfs_root
*root
,
1786 struct btrfs_path
*path
,
1787 struct btrfs_extent_inline_ref
**ref_ret
,
1788 u64 bytenr
, u64 num_bytes
, u64 parent
,
1789 u64 root_objectid
, u64 owner
, u64 offset
)
1793 ret
= lookup_inline_extent_backref(trans
, root
, path
, ref_ret
,
1794 bytenr
, num_bytes
, parent
,
1795 root_objectid
, owner
, offset
, 0);
1799 btrfs_release_path(path
);
1802 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1803 ret
= lookup_tree_block_ref(trans
, root
, path
, bytenr
, parent
,
1806 ret
= lookup_extent_data_ref(trans
, root
, path
, bytenr
, parent
,
1807 root_objectid
, owner
, offset
);
1813 * helper to update/remove inline back ref
1815 static noinline_for_stack
1816 void update_inline_extent_backref(struct btrfs_root
*root
,
1817 struct btrfs_path
*path
,
1818 struct btrfs_extent_inline_ref
*iref
,
1820 struct btrfs_delayed_extent_op
*extent_op
,
1823 struct extent_buffer
*leaf
;
1824 struct btrfs_extent_item
*ei
;
1825 struct btrfs_extent_data_ref
*dref
= NULL
;
1826 struct btrfs_shared_data_ref
*sref
= NULL
;
1834 leaf
= path
->nodes
[0];
1835 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1836 refs
= btrfs_extent_refs(leaf
, ei
);
1837 WARN_ON(refs_to_mod
< 0 && refs
+ refs_to_mod
<= 0);
1838 refs
+= refs_to_mod
;
1839 btrfs_set_extent_refs(leaf
, ei
, refs
);
1841 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1843 type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1845 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1846 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1847 refs
= btrfs_extent_data_ref_count(leaf
, dref
);
1848 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1849 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1850 refs
= btrfs_shared_data_ref_count(leaf
, sref
);
1853 BUG_ON(refs_to_mod
!= -1);
1856 BUG_ON(refs_to_mod
< 0 && refs
< -refs_to_mod
);
1857 refs
+= refs_to_mod
;
1860 if (type
== BTRFS_EXTENT_DATA_REF_KEY
)
1861 btrfs_set_extent_data_ref_count(leaf
, dref
, refs
);
1863 btrfs_set_shared_data_ref_count(leaf
, sref
, refs
);
1866 size
= btrfs_extent_inline_ref_size(type
);
1867 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1868 ptr
= (unsigned long)iref
;
1869 end
= (unsigned long)ei
+ item_size
;
1870 if (ptr
+ size
< end
)
1871 memmove_extent_buffer(leaf
, ptr
, ptr
+ size
,
1874 btrfs_truncate_item(root
, path
, item_size
, 1);
1876 btrfs_mark_buffer_dirty(leaf
);
1879 static noinline_for_stack
1880 int insert_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1881 struct btrfs_root
*root
,
1882 struct btrfs_path
*path
,
1883 u64 bytenr
, u64 num_bytes
, u64 parent
,
1884 u64 root_objectid
, u64 owner
,
1885 u64 offset
, int refs_to_add
,
1886 struct btrfs_delayed_extent_op
*extent_op
)
1888 struct btrfs_extent_inline_ref
*iref
;
1891 ret
= lookup_inline_extent_backref(trans
, root
, path
, &iref
,
1892 bytenr
, num_bytes
, parent
,
1893 root_objectid
, owner
, offset
, 1);
1895 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
);
1896 update_inline_extent_backref(root
, path
, iref
,
1897 refs_to_add
, extent_op
, NULL
);
1898 } else if (ret
== -ENOENT
) {
1899 setup_inline_extent_backref(root
, path
, iref
, parent
,
1900 root_objectid
, owner
, offset
,
1901 refs_to_add
, extent_op
);
1907 static int insert_extent_backref(struct btrfs_trans_handle
*trans
,
1908 struct btrfs_root
*root
,
1909 struct btrfs_path
*path
,
1910 u64 bytenr
, u64 parent
, u64 root_objectid
,
1911 u64 owner
, u64 offset
, int refs_to_add
)
1914 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1915 BUG_ON(refs_to_add
!= 1);
1916 ret
= insert_tree_block_ref(trans
, root
, path
, bytenr
,
1917 parent
, root_objectid
);
1919 ret
= insert_extent_data_ref(trans
, root
, path
, bytenr
,
1920 parent
, root_objectid
,
1921 owner
, offset
, refs_to_add
);
1926 static int remove_extent_backref(struct btrfs_trans_handle
*trans
,
1927 struct btrfs_root
*root
,
1928 struct btrfs_path
*path
,
1929 struct btrfs_extent_inline_ref
*iref
,
1930 int refs_to_drop
, int is_data
, int *last_ref
)
1934 BUG_ON(!is_data
&& refs_to_drop
!= 1);
1936 update_inline_extent_backref(root
, path
, iref
,
1937 -refs_to_drop
, NULL
, last_ref
);
1938 } else if (is_data
) {
1939 ret
= remove_extent_data_ref(trans
, root
, path
, refs_to_drop
,
1943 ret
= btrfs_del_item(trans
, root
, path
);
1948 #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
1949 static int btrfs_issue_discard(struct block_device
*bdev
, u64 start
, u64 len
,
1950 u64
*discarded_bytes
)
1953 u64 bytes_left
, end
;
1954 u64 aligned_start
= ALIGN(start
, 1 << 9);
1956 if (WARN_ON(start
!= aligned_start
)) {
1957 len
-= aligned_start
- start
;
1958 len
= round_down(len
, 1 << 9);
1959 start
= aligned_start
;
1962 *discarded_bytes
= 0;
1970 /* Skip any superblocks on this device. */
1971 for (j
= 0; j
< BTRFS_SUPER_MIRROR_MAX
; j
++) {
1972 u64 sb_start
= btrfs_sb_offset(j
);
1973 u64 sb_end
= sb_start
+ BTRFS_SUPER_INFO_SIZE
;
1974 u64 size
= sb_start
- start
;
1976 if (!in_range(sb_start
, start
, bytes_left
) &&
1977 !in_range(sb_end
, start
, bytes_left
) &&
1978 !in_range(start
, sb_start
, BTRFS_SUPER_INFO_SIZE
))
1982 * Superblock spans beginning of range. Adjust start and
1985 if (sb_start
<= start
) {
1986 start
+= sb_end
- start
;
1991 bytes_left
= end
- start
;
1996 ret
= blkdev_issue_discard(bdev
, start
>> 9, size
>> 9,
1999 *discarded_bytes
+= size
;
2000 else if (ret
!= -EOPNOTSUPP
)
2009 bytes_left
= end
- start
;
2013 ret
= blkdev_issue_discard(bdev
, start
>> 9, bytes_left
>> 9,
2016 *discarded_bytes
+= bytes_left
;
2021 int btrfs_discard_extent(struct btrfs_root
*root
, u64 bytenr
,
2022 u64 num_bytes
, u64
*actual_bytes
)
2025 u64 discarded_bytes
= 0;
2026 struct btrfs_bio
*bbio
= NULL
;
2029 /* Tell the block device(s) that the sectors can be discarded */
2030 ret
= btrfs_map_block(root
->fs_info
, REQ_DISCARD
,
2031 bytenr
, &num_bytes
, &bbio
, 0);
2032 /* Error condition is -ENOMEM */
2034 struct btrfs_bio_stripe
*stripe
= bbio
->stripes
;
2038 for (i
= 0; i
< bbio
->num_stripes
; i
++, stripe
++) {
2040 if (!stripe
->dev
->can_discard
)
2043 ret
= btrfs_issue_discard(stripe
->dev
->bdev
,
2048 discarded_bytes
+= bytes
;
2049 else if (ret
!= -EOPNOTSUPP
)
2050 break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */
2053 * Just in case we get back EOPNOTSUPP for some reason,
2054 * just ignore the return value so we don't screw up
2055 * people calling discard_extent.
2059 btrfs_put_bbio(bbio
);
2063 *actual_bytes
= discarded_bytes
;
2066 if (ret
== -EOPNOTSUPP
)
2071 /* Can return -ENOMEM */
2072 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
2073 struct btrfs_root
*root
,
2074 u64 bytenr
, u64 num_bytes
, u64 parent
,
2075 u64 root_objectid
, u64 owner
, u64 offset
)
2078 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2080 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
&&
2081 root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
2083 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
2084 ret
= btrfs_add_delayed_tree_ref(fs_info
, trans
, bytenr
,
2086 parent
, root_objectid
, (int)owner
,
2087 BTRFS_ADD_DELAYED_REF
, NULL
);
2089 ret
= btrfs_add_delayed_data_ref(fs_info
, trans
, bytenr
,
2090 num_bytes
, parent
, root_objectid
,
2092 BTRFS_ADD_DELAYED_REF
, NULL
);
2097 static int __btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
2098 struct btrfs_root
*root
,
2099 struct btrfs_delayed_ref_node
*node
,
2100 u64 parent
, u64 root_objectid
,
2101 u64 owner
, u64 offset
, int refs_to_add
,
2102 struct btrfs_delayed_extent_op
*extent_op
)
2104 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2105 struct btrfs_path
*path
;
2106 struct extent_buffer
*leaf
;
2107 struct btrfs_extent_item
*item
;
2108 struct btrfs_key key
;
2109 u64 bytenr
= node
->bytenr
;
2110 u64 num_bytes
= node
->num_bytes
;
2114 path
= btrfs_alloc_path();
2119 path
->leave_spinning
= 1;
2120 /* this will setup the path even if it fails to insert the back ref */
2121 ret
= insert_inline_extent_backref(trans
, fs_info
->extent_root
, path
,
2122 bytenr
, num_bytes
, parent
,
2123 root_objectid
, owner
, offset
,
2124 refs_to_add
, extent_op
);
2125 if ((ret
< 0 && ret
!= -EAGAIN
) || !ret
)
2129 * Ok we had -EAGAIN which means we didn't have space to insert and
2130 * inline extent ref, so just update the reference count and add a
2133 leaf
= path
->nodes
[0];
2134 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2135 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2136 refs
= btrfs_extent_refs(leaf
, item
);
2137 btrfs_set_extent_refs(leaf
, item
, refs
+ refs_to_add
);
2139 __run_delayed_extent_op(extent_op
, leaf
, item
);
2141 btrfs_mark_buffer_dirty(leaf
);
2142 btrfs_release_path(path
);
2145 path
->leave_spinning
= 1;
2146 /* now insert the actual backref */
2147 ret
= insert_extent_backref(trans
, root
->fs_info
->extent_root
,
2148 path
, bytenr
, parent
, root_objectid
,
2149 owner
, offset
, refs_to_add
);
2151 btrfs_abort_transaction(trans
, root
, ret
);
2153 btrfs_free_path(path
);
2157 static int run_delayed_data_ref(struct btrfs_trans_handle
*trans
,
2158 struct btrfs_root
*root
,
2159 struct btrfs_delayed_ref_node
*node
,
2160 struct btrfs_delayed_extent_op
*extent_op
,
2161 int insert_reserved
)
2164 struct btrfs_delayed_data_ref
*ref
;
2165 struct btrfs_key ins
;
2170 ins
.objectid
= node
->bytenr
;
2171 ins
.offset
= node
->num_bytes
;
2172 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2174 ref
= btrfs_delayed_node_to_data_ref(node
);
2175 trace_run_delayed_data_ref(node
, ref
, node
->action
);
2177 if (node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2178 parent
= ref
->parent
;
2179 ref_root
= ref
->root
;
2181 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2183 flags
|= extent_op
->flags_to_set
;
2184 ret
= alloc_reserved_file_extent(trans
, root
,
2185 parent
, ref_root
, flags
,
2186 ref
->objectid
, ref
->offset
,
2187 &ins
, node
->ref_mod
);
2188 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2189 ret
= __btrfs_inc_extent_ref(trans
, root
, node
, parent
,
2190 ref_root
, ref
->objectid
,
2191 ref
->offset
, node
->ref_mod
,
2193 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2194 ret
= __btrfs_free_extent(trans
, root
, node
, parent
,
2195 ref_root
, ref
->objectid
,
2196 ref
->offset
, node
->ref_mod
,
2204 static void __run_delayed_extent_op(struct btrfs_delayed_extent_op
*extent_op
,
2205 struct extent_buffer
*leaf
,
2206 struct btrfs_extent_item
*ei
)
2208 u64 flags
= btrfs_extent_flags(leaf
, ei
);
2209 if (extent_op
->update_flags
) {
2210 flags
|= extent_op
->flags_to_set
;
2211 btrfs_set_extent_flags(leaf
, ei
, flags
);
2214 if (extent_op
->update_key
) {
2215 struct btrfs_tree_block_info
*bi
;
2216 BUG_ON(!(flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
));
2217 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
2218 btrfs_set_tree_block_key(leaf
, bi
, &extent_op
->key
);
2222 static int run_delayed_extent_op(struct btrfs_trans_handle
*trans
,
2223 struct btrfs_root
*root
,
2224 struct btrfs_delayed_ref_node
*node
,
2225 struct btrfs_delayed_extent_op
*extent_op
)
2227 struct btrfs_key key
;
2228 struct btrfs_path
*path
;
2229 struct btrfs_extent_item
*ei
;
2230 struct extent_buffer
*leaf
;
2234 int metadata
= !extent_op
->is_data
;
2239 if (metadata
&& !btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
))
2242 path
= btrfs_alloc_path();
2246 key
.objectid
= node
->bytenr
;
2249 key
.type
= BTRFS_METADATA_ITEM_KEY
;
2250 key
.offset
= extent_op
->level
;
2252 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2253 key
.offset
= node
->num_bytes
;
2258 path
->leave_spinning
= 1;
2259 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
, &key
,
2267 if (path
->slots
[0] > 0) {
2269 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
2271 if (key
.objectid
== node
->bytenr
&&
2272 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
2273 key
.offset
== node
->num_bytes
)
2277 btrfs_release_path(path
);
2280 key
.objectid
= node
->bytenr
;
2281 key
.offset
= node
->num_bytes
;
2282 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2291 leaf
= path
->nodes
[0];
2292 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2293 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
2294 if (item_size
< sizeof(*ei
)) {
2295 ret
= convert_extent_item_v0(trans
, root
->fs_info
->extent_root
,
2301 leaf
= path
->nodes
[0];
2302 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2305 BUG_ON(item_size
< sizeof(*ei
));
2306 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2307 __run_delayed_extent_op(extent_op
, leaf
, ei
);
2309 btrfs_mark_buffer_dirty(leaf
);
2311 btrfs_free_path(path
);
2315 static int run_delayed_tree_ref(struct btrfs_trans_handle
*trans
,
2316 struct btrfs_root
*root
,
2317 struct btrfs_delayed_ref_node
*node
,
2318 struct btrfs_delayed_extent_op
*extent_op
,
2319 int insert_reserved
)
2322 struct btrfs_delayed_tree_ref
*ref
;
2323 struct btrfs_key ins
;
2326 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
2329 ref
= btrfs_delayed_node_to_tree_ref(node
);
2330 trace_run_delayed_tree_ref(node
, ref
, node
->action
);
2332 if (node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2333 parent
= ref
->parent
;
2334 ref_root
= ref
->root
;
2336 ins
.objectid
= node
->bytenr
;
2337 if (skinny_metadata
) {
2338 ins
.offset
= ref
->level
;
2339 ins
.type
= BTRFS_METADATA_ITEM_KEY
;
2341 ins
.offset
= node
->num_bytes
;
2342 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2345 BUG_ON(node
->ref_mod
!= 1);
2346 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2347 BUG_ON(!extent_op
|| !extent_op
->update_flags
);
2348 ret
= alloc_reserved_tree_block(trans
, root
,
2350 extent_op
->flags_to_set
,
2353 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2354 ret
= __btrfs_inc_extent_ref(trans
, root
, node
,
2358 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2359 ret
= __btrfs_free_extent(trans
, root
, node
,
2361 ref
->level
, 0, 1, extent_op
);
2368 /* helper function to actually process a single delayed ref entry */
2369 static int run_one_delayed_ref(struct btrfs_trans_handle
*trans
,
2370 struct btrfs_root
*root
,
2371 struct btrfs_delayed_ref_node
*node
,
2372 struct btrfs_delayed_extent_op
*extent_op
,
2373 int insert_reserved
)
2377 if (trans
->aborted
) {
2378 if (insert_reserved
)
2379 btrfs_pin_extent(root
, node
->bytenr
,
2380 node
->num_bytes
, 1);
2384 if (btrfs_delayed_ref_is_head(node
)) {
2385 struct btrfs_delayed_ref_head
*head
;
2387 * we've hit the end of the chain and we were supposed
2388 * to insert this extent into the tree. But, it got
2389 * deleted before we ever needed to insert it, so all
2390 * we have to do is clean up the accounting
2393 head
= btrfs_delayed_node_to_head(node
);
2394 trace_run_delayed_ref_head(node
, head
, node
->action
);
2396 if (insert_reserved
) {
2397 btrfs_pin_extent(root
, node
->bytenr
,
2398 node
->num_bytes
, 1);
2399 if (head
->is_data
) {
2400 ret
= btrfs_del_csums(trans
, root
,
2406 /* Also free its reserved qgroup space */
2407 btrfs_qgroup_free_delayed_ref(root
->fs_info
,
2408 head
->qgroup_ref_root
,
2409 head
->qgroup_reserved
);
2413 if (node
->type
== BTRFS_TREE_BLOCK_REF_KEY
||
2414 node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2415 ret
= run_delayed_tree_ref(trans
, root
, node
, extent_op
,
2417 else if (node
->type
== BTRFS_EXTENT_DATA_REF_KEY
||
2418 node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2419 ret
= run_delayed_data_ref(trans
, root
, node
, extent_op
,
2426 static inline struct btrfs_delayed_ref_node
*
2427 select_delayed_ref(struct btrfs_delayed_ref_head
*head
)
2429 struct btrfs_delayed_ref_node
*ref
;
2431 if (list_empty(&head
->ref_list
))
2435 * Select a delayed ref of type BTRFS_ADD_DELAYED_REF first.
2436 * This is to prevent a ref count from going down to zero, which deletes
2437 * the extent item from the extent tree, when there still are references
2438 * to add, which would fail because they would not find the extent item.
2440 list_for_each_entry(ref
, &head
->ref_list
, list
) {
2441 if (ref
->action
== BTRFS_ADD_DELAYED_REF
)
2445 return list_entry(head
->ref_list
.next
, struct btrfs_delayed_ref_node
,
2450 * Returns 0 on success or if called with an already aborted transaction.
2451 * Returns -ENOMEM or -EIO on failure and will abort the transaction.
2453 static noinline
int __btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2454 struct btrfs_root
*root
,
2457 struct btrfs_delayed_ref_root
*delayed_refs
;
2458 struct btrfs_delayed_ref_node
*ref
;
2459 struct btrfs_delayed_ref_head
*locked_ref
= NULL
;
2460 struct btrfs_delayed_extent_op
*extent_op
;
2461 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2462 ktime_t start
= ktime_get();
2464 unsigned long count
= 0;
2465 unsigned long actual_count
= 0;
2466 int must_insert_reserved
= 0;
2468 delayed_refs
= &trans
->transaction
->delayed_refs
;
2474 spin_lock(&delayed_refs
->lock
);
2475 locked_ref
= btrfs_select_ref_head(trans
);
2477 spin_unlock(&delayed_refs
->lock
);
2481 /* grab the lock that says we are going to process
2482 * all the refs for this head */
2483 ret
= btrfs_delayed_ref_lock(trans
, locked_ref
);
2484 spin_unlock(&delayed_refs
->lock
);
2486 * we may have dropped the spin lock to get the head
2487 * mutex lock, and that might have given someone else
2488 * time to free the head. If that's true, it has been
2489 * removed from our list and we can move on.
2491 if (ret
== -EAGAIN
) {
2499 * We need to try and merge add/drops of the same ref since we
2500 * can run into issues with relocate dropping the implicit ref
2501 * and then it being added back again before the drop can
2502 * finish. If we merged anything we need to re-loop so we can
2504 * Or we can get node references of the same type that weren't
2505 * merged when created due to bumps in the tree mod seq, and
2506 * we need to merge them to prevent adding an inline extent
2507 * backref before dropping it (triggering a BUG_ON at
2508 * insert_inline_extent_backref()).
2510 spin_lock(&locked_ref
->lock
);
2511 btrfs_merge_delayed_refs(trans
, fs_info
, delayed_refs
,
2515 * locked_ref is the head node, so we have to go one
2516 * node back for any delayed ref updates
2518 ref
= select_delayed_ref(locked_ref
);
2520 if (ref
&& ref
->seq
&&
2521 btrfs_check_delayed_seq(fs_info
, delayed_refs
, ref
->seq
)) {
2522 spin_unlock(&locked_ref
->lock
);
2523 btrfs_delayed_ref_unlock(locked_ref
);
2524 spin_lock(&delayed_refs
->lock
);
2525 locked_ref
->processing
= 0;
2526 delayed_refs
->num_heads_ready
++;
2527 spin_unlock(&delayed_refs
->lock
);
2535 * record the must insert reserved flag before we
2536 * drop the spin lock.
2538 must_insert_reserved
= locked_ref
->must_insert_reserved
;
2539 locked_ref
->must_insert_reserved
= 0;
2541 extent_op
= locked_ref
->extent_op
;
2542 locked_ref
->extent_op
= NULL
;
2547 /* All delayed refs have been processed, Go ahead
2548 * and send the head node to run_one_delayed_ref,
2549 * so that any accounting fixes can happen
2551 ref
= &locked_ref
->node
;
2553 if (extent_op
&& must_insert_reserved
) {
2554 btrfs_free_delayed_extent_op(extent_op
);
2559 spin_unlock(&locked_ref
->lock
);
2560 ret
= run_delayed_extent_op(trans
, root
,
2562 btrfs_free_delayed_extent_op(extent_op
);
2566 * Need to reset must_insert_reserved if
2567 * there was an error so the abort stuff
2568 * can cleanup the reserved space
2571 if (must_insert_reserved
)
2572 locked_ref
->must_insert_reserved
= 1;
2573 locked_ref
->processing
= 0;
2574 btrfs_debug(fs_info
, "run_delayed_extent_op returned %d", ret
);
2575 btrfs_delayed_ref_unlock(locked_ref
);
2582 * Need to drop our head ref lock and re-aqcuire the
2583 * delayed ref lock and then re-check to make sure
2586 spin_unlock(&locked_ref
->lock
);
2587 spin_lock(&delayed_refs
->lock
);
2588 spin_lock(&locked_ref
->lock
);
2589 if (!list_empty(&locked_ref
->ref_list
) ||
2590 locked_ref
->extent_op
) {
2591 spin_unlock(&locked_ref
->lock
);
2592 spin_unlock(&delayed_refs
->lock
);
2596 delayed_refs
->num_heads
--;
2597 rb_erase(&locked_ref
->href_node
,
2598 &delayed_refs
->href_root
);
2599 spin_unlock(&delayed_refs
->lock
);
2603 list_del(&ref
->list
);
2605 atomic_dec(&delayed_refs
->num_entries
);
2607 if (!btrfs_delayed_ref_is_head(ref
)) {
2609 * when we play the delayed ref, also correct the
2612 switch (ref
->action
) {
2613 case BTRFS_ADD_DELAYED_REF
:
2614 case BTRFS_ADD_DELAYED_EXTENT
:
2615 locked_ref
->node
.ref_mod
-= ref
->ref_mod
;
2617 case BTRFS_DROP_DELAYED_REF
:
2618 locked_ref
->node
.ref_mod
+= ref
->ref_mod
;
2624 spin_unlock(&locked_ref
->lock
);
2626 ret
= run_one_delayed_ref(trans
, root
, ref
, extent_op
,
2627 must_insert_reserved
);
2629 btrfs_free_delayed_extent_op(extent_op
);
2631 locked_ref
->processing
= 0;
2632 btrfs_delayed_ref_unlock(locked_ref
);
2633 btrfs_put_delayed_ref(ref
);
2634 btrfs_debug(fs_info
, "run_one_delayed_ref returned %d", ret
);
2639 * If this node is a head, that means all the refs in this head
2640 * have been dealt with, and we will pick the next head to deal
2641 * with, so we must unlock the head and drop it from the cluster
2642 * list before we release it.
2644 if (btrfs_delayed_ref_is_head(ref
)) {
2645 if (locked_ref
->is_data
&&
2646 locked_ref
->total_ref_mod
< 0) {
2647 spin_lock(&delayed_refs
->lock
);
2648 delayed_refs
->pending_csums
-= ref
->num_bytes
;
2649 spin_unlock(&delayed_refs
->lock
);
2651 btrfs_delayed_ref_unlock(locked_ref
);
2654 btrfs_put_delayed_ref(ref
);
2660 * We don't want to include ref heads since we can have empty ref heads
2661 * and those will drastically skew our runtime down since we just do
2662 * accounting, no actual extent tree updates.
2664 if (actual_count
> 0) {
2665 u64 runtime
= ktime_to_ns(ktime_sub(ktime_get(), start
));
2669 * We weigh the current average higher than our current runtime
2670 * to avoid large swings in the average.
2672 spin_lock(&delayed_refs
->lock
);
2673 avg
= fs_info
->avg_delayed_ref_runtime
* 3 + runtime
;
2674 fs_info
->avg_delayed_ref_runtime
= avg
>> 2; /* div by 4 */
2675 spin_unlock(&delayed_refs
->lock
);
2680 #ifdef SCRAMBLE_DELAYED_REFS
2682 * Normally delayed refs get processed in ascending bytenr order. This
2683 * correlates in most cases to the order added. To expose dependencies on this
2684 * order, we start to process the tree in the middle instead of the beginning
2686 static u64
find_middle(struct rb_root
*root
)
2688 struct rb_node
*n
= root
->rb_node
;
2689 struct btrfs_delayed_ref_node
*entry
;
2692 u64 first
= 0, last
= 0;
2696 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2697 first
= entry
->bytenr
;
2701 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2702 last
= entry
->bytenr
;
2707 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2708 WARN_ON(!entry
->in_tree
);
2710 middle
= entry
->bytenr
;
2723 static inline u64
heads_to_leaves(struct btrfs_root
*root
, u64 heads
)
2727 num_bytes
= heads
* (sizeof(struct btrfs_extent_item
) +
2728 sizeof(struct btrfs_extent_inline_ref
));
2729 if (!btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
))
2730 num_bytes
+= heads
* sizeof(struct btrfs_tree_block_info
);
2733 * We don't ever fill up leaves all the way so multiply by 2 just to be
2734 * closer to what we're really going to want to ouse.
2736 return div_u64(num_bytes
, BTRFS_LEAF_DATA_SIZE(root
));
2740 * Takes the number of bytes to be csumm'ed and figures out how many leaves it
2741 * would require to store the csums for that many bytes.
2743 u64
btrfs_csum_bytes_to_leaves(struct btrfs_root
*root
, u64 csum_bytes
)
2746 u64 num_csums_per_leaf
;
2749 csum_size
= BTRFS_LEAF_DATA_SIZE(root
) - sizeof(struct btrfs_item
);
2750 num_csums_per_leaf
= div64_u64(csum_size
,
2751 (u64
)btrfs_super_csum_size(root
->fs_info
->super_copy
));
2752 num_csums
= div64_u64(csum_bytes
, root
->sectorsize
);
2753 num_csums
+= num_csums_per_leaf
- 1;
2754 num_csums
= div64_u64(num_csums
, num_csums_per_leaf
);
2758 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle
*trans
,
2759 struct btrfs_root
*root
)
2761 struct btrfs_block_rsv
*global_rsv
;
2762 u64 num_heads
= trans
->transaction
->delayed_refs
.num_heads_ready
;
2763 u64 csum_bytes
= trans
->transaction
->delayed_refs
.pending_csums
;
2764 u64 num_dirty_bgs
= trans
->transaction
->num_dirty_bgs
;
2765 u64 num_bytes
, num_dirty_bgs_bytes
;
2768 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
2769 num_heads
= heads_to_leaves(root
, num_heads
);
2771 num_bytes
+= (num_heads
- 1) * root
->nodesize
;
2773 num_bytes
+= btrfs_csum_bytes_to_leaves(root
, csum_bytes
) * root
->nodesize
;
2774 num_dirty_bgs_bytes
= btrfs_calc_trans_metadata_size(root
,
2776 global_rsv
= &root
->fs_info
->global_block_rsv
;
2779 * If we can't allocate any more chunks lets make sure we have _lots_ of
2780 * wiggle room since running delayed refs can create more delayed refs.
2782 if (global_rsv
->space_info
->full
) {
2783 num_dirty_bgs_bytes
<<= 1;
2787 spin_lock(&global_rsv
->lock
);
2788 if (global_rsv
->reserved
<= num_bytes
+ num_dirty_bgs_bytes
)
2790 spin_unlock(&global_rsv
->lock
);
2794 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle
*trans
,
2795 struct btrfs_root
*root
)
2797 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2799 atomic_read(&trans
->transaction
->delayed_refs
.num_entries
);
2804 avg_runtime
= fs_info
->avg_delayed_ref_runtime
;
2805 val
= num_entries
* avg_runtime
;
2806 if (num_entries
* avg_runtime
>= NSEC_PER_SEC
)
2808 if (val
>= NSEC_PER_SEC
/ 2)
2811 return btrfs_check_space_for_delayed_refs(trans
, root
);
2814 struct async_delayed_refs
{
2815 struct btrfs_root
*root
;
2819 struct completion wait
;
2820 struct btrfs_work work
;
2823 static void delayed_ref_async_start(struct btrfs_work
*work
)
2825 struct async_delayed_refs
*async
;
2826 struct btrfs_trans_handle
*trans
;
2829 async
= container_of(work
, struct async_delayed_refs
, work
);
2831 trans
= btrfs_join_transaction(async
->root
);
2832 if (IS_ERR(trans
)) {
2833 async
->error
= PTR_ERR(trans
);
2838 * trans->sync means that when we call end_transaciton, we won't
2839 * wait on delayed refs
2842 ret
= btrfs_run_delayed_refs(trans
, async
->root
, async
->count
);
2846 ret
= btrfs_end_transaction(trans
, async
->root
);
2847 if (ret
&& !async
->error
)
2851 complete(&async
->wait
);
2856 int btrfs_async_run_delayed_refs(struct btrfs_root
*root
,
2857 unsigned long count
, int wait
)
2859 struct async_delayed_refs
*async
;
2862 async
= kmalloc(sizeof(*async
), GFP_NOFS
);
2866 async
->root
= root
->fs_info
->tree_root
;
2867 async
->count
= count
;
2873 init_completion(&async
->wait
);
2875 btrfs_init_work(&async
->work
, btrfs_extent_refs_helper
,
2876 delayed_ref_async_start
, NULL
, NULL
);
2878 btrfs_queue_work(root
->fs_info
->extent_workers
, &async
->work
);
2881 wait_for_completion(&async
->wait
);
2890 * this starts processing the delayed reference count updates and
2891 * extent insertions we have queued up so far. count can be
2892 * 0, which means to process everything in the tree at the start
2893 * of the run (but not newly added entries), or it can be some target
2894 * number you'd like to process.
2896 * Returns 0 on success or if called with an aborted transaction
2897 * Returns <0 on error and aborts the transaction
2899 int btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2900 struct btrfs_root
*root
, unsigned long count
)
2902 struct rb_node
*node
;
2903 struct btrfs_delayed_ref_root
*delayed_refs
;
2904 struct btrfs_delayed_ref_head
*head
;
2906 int run_all
= count
== (unsigned long)-1;
2907 bool can_flush_pending_bgs
= trans
->can_flush_pending_bgs
;
2909 /* We'll clean this up in btrfs_cleanup_transaction */
2913 if (root
== root
->fs_info
->extent_root
)
2914 root
= root
->fs_info
->tree_root
;
2916 delayed_refs
= &trans
->transaction
->delayed_refs
;
2918 count
= atomic_read(&delayed_refs
->num_entries
) * 2;
2921 #ifdef SCRAMBLE_DELAYED_REFS
2922 delayed_refs
->run_delayed_start
= find_middle(&delayed_refs
->root
);
2924 trans
->can_flush_pending_bgs
= false;
2925 ret
= __btrfs_run_delayed_refs(trans
, root
, count
);
2927 btrfs_abort_transaction(trans
, root
, ret
);
2932 if (!list_empty(&trans
->new_bgs
))
2933 btrfs_create_pending_block_groups(trans
, root
);
2935 spin_lock(&delayed_refs
->lock
);
2936 node
= rb_first(&delayed_refs
->href_root
);
2938 spin_unlock(&delayed_refs
->lock
);
2941 count
= (unsigned long)-1;
2944 head
= rb_entry(node
, struct btrfs_delayed_ref_head
,
2946 if (btrfs_delayed_ref_is_head(&head
->node
)) {
2947 struct btrfs_delayed_ref_node
*ref
;
2950 atomic_inc(&ref
->refs
);
2952 spin_unlock(&delayed_refs
->lock
);
2954 * Mutex was contended, block until it's
2955 * released and try again
2957 mutex_lock(&head
->mutex
);
2958 mutex_unlock(&head
->mutex
);
2960 btrfs_put_delayed_ref(ref
);
2966 node
= rb_next(node
);
2968 spin_unlock(&delayed_refs
->lock
);
2973 assert_qgroups_uptodate(trans
);
2974 trans
->can_flush_pending_bgs
= can_flush_pending_bgs
;
2978 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle
*trans
,
2979 struct btrfs_root
*root
,
2980 u64 bytenr
, u64 num_bytes
, u64 flags
,
2981 int level
, int is_data
)
2983 struct btrfs_delayed_extent_op
*extent_op
;
2986 extent_op
= btrfs_alloc_delayed_extent_op();
2990 extent_op
->flags_to_set
= flags
;
2991 extent_op
->update_flags
= 1;
2992 extent_op
->update_key
= 0;
2993 extent_op
->is_data
= is_data
? 1 : 0;
2994 extent_op
->level
= level
;
2996 ret
= btrfs_add_delayed_extent_op(root
->fs_info
, trans
, bytenr
,
2997 num_bytes
, extent_op
);
2999 btrfs_free_delayed_extent_op(extent_op
);
3003 static noinline
int check_delayed_ref(struct btrfs_trans_handle
*trans
,
3004 struct btrfs_root
*root
,
3005 struct btrfs_path
*path
,
3006 u64 objectid
, u64 offset
, u64 bytenr
)
3008 struct btrfs_delayed_ref_head
*head
;
3009 struct btrfs_delayed_ref_node
*ref
;
3010 struct btrfs_delayed_data_ref
*data_ref
;
3011 struct btrfs_delayed_ref_root
*delayed_refs
;
3014 delayed_refs
= &trans
->transaction
->delayed_refs
;
3015 spin_lock(&delayed_refs
->lock
);
3016 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
3018 spin_unlock(&delayed_refs
->lock
);
3022 if (!mutex_trylock(&head
->mutex
)) {
3023 atomic_inc(&head
->node
.refs
);
3024 spin_unlock(&delayed_refs
->lock
);
3026 btrfs_release_path(path
);
3029 * Mutex was contended, block until it's released and let
3032 mutex_lock(&head
->mutex
);
3033 mutex_unlock(&head
->mutex
);
3034 btrfs_put_delayed_ref(&head
->node
);
3037 spin_unlock(&delayed_refs
->lock
);
3039 spin_lock(&head
->lock
);
3040 list_for_each_entry(ref
, &head
->ref_list
, list
) {
3041 /* If it's a shared ref we know a cross reference exists */
3042 if (ref
->type
!= BTRFS_EXTENT_DATA_REF_KEY
) {
3047 data_ref
= btrfs_delayed_node_to_data_ref(ref
);
3050 * If our ref doesn't match the one we're currently looking at
3051 * then we have a cross reference.
3053 if (data_ref
->root
!= root
->root_key
.objectid
||
3054 data_ref
->objectid
!= objectid
||
3055 data_ref
->offset
!= offset
) {
3060 spin_unlock(&head
->lock
);
3061 mutex_unlock(&head
->mutex
);
3065 static noinline
int check_committed_ref(struct btrfs_trans_handle
*trans
,
3066 struct btrfs_root
*root
,
3067 struct btrfs_path
*path
,
3068 u64 objectid
, u64 offset
, u64 bytenr
)
3070 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
3071 struct extent_buffer
*leaf
;
3072 struct btrfs_extent_data_ref
*ref
;
3073 struct btrfs_extent_inline_ref
*iref
;
3074 struct btrfs_extent_item
*ei
;
3075 struct btrfs_key key
;
3079 key
.objectid
= bytenr
;
3080 key
.offset
= (u64
)-1;
3081 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
3083 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
3086 BUG_ON(ret
== 0); /* Corruption */
3089 if (path
->slots
[0] == 0)
3093 leaf
= path
->nodes
[0];
3094 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
3096 if (key
.objectid
!= bytenr
|| key
.type
!= BTRFS_EXTENT_ITEM_KEY
)
3100 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
3101 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
3102 if (item_size
< sizeof(*ei
)) {
3103 WARN_ON(item_size
!= sizeof(struct btrfs_extent_item_v0
));
3107 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
3109 if (item_size
!= sizeof(*ei
) +
3110 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY
))
3113 if (btrfs_extent_generation(leaf
, ei
) <=
3114 btrfs_root_last_snapshot(&root
->root_item
))
3117 iref
= (struct btrfs_extent_inline_ref
*)(ei
+ 1);
3118 if (btrfs_extent_inline_ref_type(leaf
, iref
) !=
3119 BTRFS_EXTENT_DATA_REF_KEY
)
3122 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
3123 if (btrfs_extent_refs(leaf
, ei
) !=
3124 btrfs_extent_data_ref_count(leaf
, ref
) ||
3125 btrfs_extent_data_ref_root(leaf
, ref
) !=
3126 root
->root_key
.objectid
||
3127 btrfs_extent_data_ref_objectid(leaf
, ref
) != objectid
||
3128 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
3136 int btrfs_cross_ref_exist(struct btrfs_trans_handle
*trans
,
3137 struct btrfs_root
*root
,
3138 u64 objectid
, u64 offset
, u64 bytenr
)
3140 struct btrfs_path
*path
;
3144 path
= btrfs_alloc_path();
3149 ret
= check_committed_ref(trans
, root
, path
, objectid
,
3151 if (ret
&& ret
!= -ENOENT
)
3154 ret2
= check_delayed_ref(trans
, root
, path
, objectid
,
3156 } while (ret2
== -EAGAIN
);
3158 if (ret2
&& ret2
!= -ENOENT
) {
3163 if (ret
!= -ENOENT
|| ret2
!= -ENOENT
)
3166 btrfs_free_path(path
);
3167 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
3172 static int __btrfs_mod_ref(struct btrfs_trans_handle
*trans
,
3173 struct btrfs_root
*root
,
3174 struct extent_buffer
*buf
,
3175 int full_backref
, int inc
)
3182 struct btrfs_key key
;
3183 struct btrfs_file_extent_item
*fi
;
3187 int (*process_func
)(struct btrfs_trans_handle
*, struct btrfs_root
*,
3188 u64
, u64
, u64
, u64
, u64
, u64
);
3191 if (btrfs_test_is_dummy_root(root
))
3194 ref_root
= btrfs_header_owner(buf
);
3195 nritems
= btrfs_header_nritems(buf
);
3196 level
= btrfs_header_level(buf
);
3198 if (!test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) && level
== 0)
3202 process_func
= btrfs_inc_extent_ref
;
3204 process_func
= btrfs_free_extent
;
3207 parent
= buf
->start
;
3211 for (i
= 0; i
< nritems
; i
++) {
3213 btrfs_item_key_to_cpu(buf
, &key
, i
);
3214 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
3216 fi
= btrfs_item_ptr(buf
, i
,
3217 struct btrfs_file_extent_item
);
3218 if (btrfs_file_extent_type(buf
, fi
) ==
3219 BTRFS_FILE_EXTENT_INLINE
)
3221 bytenr
= btrfs_file_extent_disk_bytenr(buf
, fi
);
3225 num_bytes
= btrfs_file_extent_disk_num_bytes(buf
, fi
);
3226 key
.offset
-= btrfs_file_extent_offset(buf
, fi
);
3227 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
3228 parent
, ref_root
, key
.objectid
,
3233 bytenr
= btrfs_node_blockptr(buf
, i
);
3234 num_bytes
= root
->nodesize
;
3235 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
3236 parent
, ref_root
, level
- 1, 0);
3246 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3247 struct extent_buffer
*buf
, int full_backref
)
3249 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 1);
3252 int btrfs_dec_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3253 struct extent_buffer
*buf
, int full_backref
)
3255 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 0);
3258 static int write_one_cache_group(struct btrfs_trans_handle
*trans
,
3259 struct btrfs_root
*root
,
3260 struct btrfs_path
*path
,
3261 struct btrfs_block_group_cache
*cache
)
3264 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
3266 struct extent_buffer
*leaf
;
3268 ret
= btrfs_search_slot(trans
, extent_root
, &cache
->key
, path
, 0, 1);
3275 leaf
= path
->nodes
[0];
3276 bi
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
3277 write_extent_buffer(leaf
, &cache
->item
, bi
, sizeof(cache
->item
));
3278 btrfs_mark_buffer_dirty(leaf
);
3280 btrfs_release_path(path
);
3285 static struct btrfs_block_group_cache
*
3286 next_block_group(struct btrfs_root
*root
,
3287 struct btrfs_block_group_cache
*cache
)
3289 struct rb_node
*node
;
3291 spin_lock(&root
->fs_info
->block_group_cache_lock
);
3293 /* If our block group was removed, we need a full search. */
3294 if (RB_EMPTY_NODE(&cache
->cache_node
)) {
3295 const u64 next_bytenr
= cache
->key
.objectid
+ cache
->key
.offset
;
3297 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
3298 btrfs_put_block_group(cache
);
3299 cache
= btrfs_lookup_first_block_group(root
->fs_info
,
3303 node
= rb_next(&cache
->cache_node
);
3304 btrfs_put_block_group(cache
);
3306 cache
= rb_entry(node
, struct btrfs_block_group_cache
,
3308 btrfs_get_block_group(cache
);
3311 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
3315 static int cache_save_setup(struct btrfs_block_group_cache
*block_group
,
3316 struct btrfs_trans_handle
*trans
,
3317 struct btrfs_path
*path
)
3319 struct btrfs_root
*root
= block_group
->fs_info
->tree_root
;
3320 struct inode
*inode
= NULL
;
3322 int dcs
= BTRFS_DC_ERROR
;
3328 * If this block group is smaller than 100 megs don't bother caching the
3331 if (block_group
->key
.offset
< (100 * 1024 * 1024)) {
3332 spin_lock(&block_group
->lock
);
3333 block_group
->disk_cache_state
= BTRFS_DC_WRITTEN
;
3334 spin_unlock(&block_group
->lock
);
3341 inode
= lookup_free_space_inode(root
, block_group
, path
);
3342 if (IS_ERR(inode
) && PTR_ERR(inode
) != -ENOENT
) {
3343 ret
= PTR_ERR(inode
);
3344 btrfs_release_path(path
);
3348 if (IS_ERR(inode
)) {
3352 if (block_group
->ro
)
3355 ret
= create_free_space_inode(root
, trans
, block_group
, path
);
3361 /* We've already setup this transaction, go ahead and exit */
3362 if (block_group
->cache_generation
== trans
->transid
&&
3363 i_size_read(inode
)) {
3364 dcs
= BTRFS_DC_SETUP
;
3369 * We want to set the generation to 0, that way if anything goes wrong
3370 * from here on out we know not to trust this cache when we load up next
3373 BTRFS_I(inode
)->generation
= 0;
3374 ret
= btrfs_update_inode(trans
, root
, inode
);
3377 * So theoretically we could recover from this, simply set the
3378 * super cache generation to 0 so we know to invalidate the
3379 * cache, but then we'd have to keep track of the block groups
3380 * that fail this way so we know we _have_ to reset this cache
3381 * before the next commit or risk reading stale cache. So to
3382 * limit our exposure to horrible edge cases lets just abort the
3383 * transaction, this only happens in really bad situations
3386 btrfs_abort_transaction(trans
, root
, ret
);
3391 if (i_size_read(inode
) > 0) {
3392 ret
= btrfs_check_trunc_cache_free_space(root
,
3393 &root
->fs_info
->global_block_rsv
);
3397 ret
= btrfs_truncate_free_space_cache(root
, trans
, NULL
, inode
);
3402 spin_lock(&block_group
->lock
);
3403 if (block_group
->cached
!= BTRFS_CACHE_FINISHED
||
3404 !btrfs_test_opt(root
, SPACE_CACHE
)) {
3406 * don't bother trying to write stuff out _if_
3407 * a) we're not cached,
3408 * b) we're with nospace_cache mount option.
3410 dcs
= BTRFS_DC_WRITTEN
;
3411 spin_unlock(&block_group
->lock
);
3414 spin_unlock(&block_group
->lock
);
3417 * We hit an ENOSPC when setting up the cache in this transaction, just
3418 * skip doing the setup, we've already cleared the cache so we're safe.
3420 if (test_bit(BTRFS_TRANS_CACHE_ENOSPC
, &trans
->transaction
->flags
)) {
3426 * Try to preallocate enough space based on how big the block group is.
3427 * Keep in mind this has to include any pinned space which could end up
3428 * taking up quite a bit since it's not folded into the other space
3431 num_pages
= div_u64(block_group
->key
.offset
, 256 * 1024 * 1024);
3436 num_pages
*= PAGE_CACHE_SIZE
;
3438 ret
= btrfs_check_data_free_space(inode
, 0, num_pages
);
3442 ret
= btrfs_prealloc_file_range_trans(inode
, trans
, 0, 0, num_pages
,
3443 num_pages
, num_pages
,
3446 * Our cache requires contiguous chunks so that we don't modify a bunch
3447 * of metadata or split extents when writing the cache out, which means
3448 * we can enospc if we are heavily fragmented in addition to just normal
3449 * out of space conditions. So if we hit this just skip setting up any
3450 * other block groups for this transaction, maybe we'll unpin enough
3451 * space the next time around.
3454 dcs
= BTRFS_DC_SETUP
;
3455 else if (ret
== -ENOSPC
)
3456 set_bit(BTRFS_TRANS_CACHE_ENOSPC
, &trans
->transaction
->flags
);
3457 btrfs_free_reserved_data_space(inode
, 0, num_pages
);
3462 btrfs_release_path(path
);
3464 spin_lock(&block_group
->lock
);
3465 if (!ret
&& dcs
== BTRFS_DC_SETUP
)
3466 block_group
->cache_generation
= trans
->transid
;
3467 block_group
->disk_cache_state
= dcs
;
3468 spin_unlock(&block_group
->lock
);
3473 int btrfs_setup_space_cache(struct btrfs_trans_handle
*trans
,
3474 struct btrfs_root
*root
)
3476 struct btrfs_block_group_cache
*cache
, *tmp
;
3477 struct btrfs_transaction
*cur_trans
= trans
->transaction
;
3478 struct btrfs_path
*path
;
3480 if (list_empty(&cur_trans
->dirty_bgs
) ||
3481 !btrfs_test_opt(root
, SPACE_CACHE
))
3484 path
= btrfs_alloc_path();
3488 /* Could add new block groups, use _safe just in case */
3489 list_for_each_entry_safe(cache
, tmp
, &cur_trans
->dirty_bgs
,
3491 if (cache
->disk_cache_state
== BTRFS_DC_CLEAR
)
3492 cache_save_setup(cache
, trans
, path
);
3495 btrfs_free_path(path
);
3500 * transaction commit does final block group cache writeback during a
3501 * critical section where nothing is allowed to change the FS. This is
3502 * required in order for the cache to actually match the block group,
3503 * but can introduce a lot of latency into the commit.
3505 * So, btrfs_start_dirty_block_groups is here to kick off block group
3506 * cache IO. There's a chance we'll have to redo some of it if the
3507 * block group changes again during the commit, but it greatly reduces
3508 * the commit latency by getting rid of the easy block groups while
3509 * we're still allowing others to join the commit.
3511 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle
*trans
,
3512 struct btrfs_root
*root
)
3514 struct btrfs_block_group_cache
*cache
;
3515 struct btrfs_transaction
*cur_trans
= trans
->transaction
;
3518 struct btrfs_path
*path
= NULL
;
3520 struct list_head
*io
= &cur_trans
->io_bgs
;
3521 int num_started
= 0;
3524 spin_lock(&cur_trans
->dirty_bgs_lock
);
3525 if (list_empty(&cur_trans
->dirty_bgs
)) {
3526 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3529 list_splice_init(&cur_trans
->dirty_bgs
, &dirty
);
3530 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3534 * make sure all the block groups on our dirty list actually
3537 btrfs_create_pending_block_groups(trans
, root
);
3540 path
= btrfs_alloc_path();
3546 * cache_write_mutex is here only to save us from balance or automatic
3547 * removal of empty block groups deleting this block group while we are
3548 * writing out the cache
3550 mutex_lock(&trans
->transaction
->cache_write_mutex
);
3551 while (!list_empty(&dirty
)) {
3552 cache
= list_first_entry(&dirty
,
3553 struct btrfs_block_group_cache
,
3556 * this can happen if something re-dirties a block
3557 * group that is already under IO. Just wait for it to
3558 * finish and then do it all again
3560 if (!list_empty(&cache
->io_list
)) {
3561 list_del_init(&cache
->io_list
);
3562 btrfs_wait_cache_io(root
, trans
, cache
,
3563 &cache
->io_ctl
, path
,
3564 cache
->key
.objectid
);
3565 btrfs_put_block_group(cache
);
3570 * btrfs_wait_cache_io uses the cache->dirty_list to decide
3571 * if it should update the cache_state. Don't delete
3572 * until after we wait.
3574 * Since we're not running in the commit critical section
3575 * we need the dirty_bgs_lock to protect from update_block_group
3577 spin_lock(&cur_trans
->dirty_bgs_lock
);
3578 list_del_init(&cache
->dirty_list
);
3579 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3583 cache_save_setup(cache
, trans
, path
);
3585 if (cache
->disk_cache_state
== BTRFS_DC_SETUP
) {
3586 cache
->io_ctl
.inode
= NULL
;
3587 ret
= btrfs_write_out_cache(root
, trans
, cache
, path
);
3588 if (ret
== 0 && cache
->io_ctl
.inode
) {
3593 * the cache_write_mutex is protecting
3596 list_add_tail(&cache
->io_list
, io
);
3599 * if we failed to write the cache, the
3600 * generation will be bad and life goes on
3606 ret
= write_one_cache_group(trans
, root
, path
, cache
);
3608 * Our block group might still be attached to the list
3609 * of new block groups in the transaction handle of some
3610 * other task (struct btrfs_trans_handle->new_bgs). This
3611 * means its block group item isn't yet in the extent
3612 * tree. If this happens ignore the error, as we will
3613 * try again later in the critical section of the
3614 * transaction commit.
3616 if (ret
== -ENOENT
) {
3618 spin_lock(&cur_trans
->dirty_bgs_lock
);
3619 if (list_empty(&cache
->dirty_list
)) {
3620 list_add_tail(&cache
->dirty_list
,
3621 &cur_trans
->dirty_bgs
);
3622 btrfs_get_block_group(cache
);
3624 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3626 btrfs_abort_transaction(trans
, root
, ret
);
3630 /* if its not on the io list, we need to put the block group */
3632 btrfs_put_block_group(cache
);
3638 * Avoid blocking other tasks for too long. It might even save
3639 * us from writing caches for block groups that are going to be
3642 mutex_unlock(&trans
->transaction
->cache_write_mutex
);
3643 mutex_lock(&trans
->transaction
->cache_write_mutex
);
3645 mutex_unlock(&trans
->transaction
->cache_write_mutex
);
3648 * go through delayed refs for all the stuff we've just kicked off
3649 * and then loop back (just once)
3651 ret
= btrfs_run_delayed_refs(trans
, root
, 0);
3652 if (!ret
&& loops
== 0) {
3654 spin_lock(&cur_trans
->dirty_bgs_lock
);
3655 list_splice_init(&cur_trans
->dirty_bgs
, &dirty
);
3657 * dirty_bgs_lock protects us from concurrent block group
3658 * deletes too (not just cache_write_mutex).
3660 if (!list_empty(&dirty
)) {
3661 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3664 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3667 btrfs_free_path(path
);
3671 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
3672 struct btrfs_root
*root
)
3674 struct btrfs_block_group_cache
*cache
;
3675 struct btrfs_transaction
*cur_trans
= trans
->transaction
;
3678 struct btrfs_path
*path
;
3679 struct list_head
*io
= &cur_trans
->io_bgs
;
3680 int num_started
= 0;
3682 path
= btrfs_alloc_path();
3687 * We don't need the lock here since we are protected by the transaction
3688 * commit. We want to do the cache_save_setup first and then run the
3689 * delayed refs to make sure we have the best chance at doing this all
3692 while (!list_empty(&cur_trans
->dirty_bgs
)) {
3693 cache
= list_first_entry(&cur_trans
->dirty_bgs
,
3694 struct btrfs_block_group_cache
,
3698 * this can happen if cache_save_setup re-dirties a block
3699 * group that is already under IO. Just wait for it to
3700 * finish and then do it all again
3702 if (!list_empty(&cache
->io_list
)) {
3703 list_del_init(&cache
->io_list
);
3704 btrfs_wait_cache_io(root
, trans
, cache
,
3705 &cache
->io_ctl
, path
,
3706 cache
->key
.objectid
);
3707 btrfs_put_block_group(cache
);
3711 * don't remove from the dirty list until after we've waited
3714 list_del_init(&cache
->dirty_list
);
3717 cache_save_setup(cache
, trans
, path
);
3720 ret
= btrfs_run_delayed_refs(trans
, root
, (unsigned long) -1);
3722 if (!ret
&& cache
->disk_cache_state
== BTRFS_DC_SETUP
) {
3723 cache
->io_ctl
.inode
= NULL
;
3724 ret
= btrfs_write_out_cache(root
, trans
, cache
, path
);
3725 if (ret
== 0 && cache
->io_ctl
.inode
) {
3728 list_add_tail(&cache
->io_list
, io
);
3731 * if we failed to write the cache, the
3732 * generation will be bad and life goes on
3738 ret
= write_one_cache_group(trans
, root
, path
, cache
);
3740 btrfs_abort_transaction(trans
, root
, ret
);
3743 /* if its not on the io list, we need to put the block group */
3745 btrfs_put_block_group(cache
);
3748 while (!list_empty(io
)) {
3749 cache
= list_first_entry(io
, struct btrfs_block_group_cache
,
3751 list_del_init(&cache
->io_list
);
3752 btrfs_wait_cache_io(root
, trans
, cache
,
3753 &cache
->io_ctl
, path
, cache
->key
.objectid
);
3754 btrfs_put_block_group(cache
);
3757 btrfs_free_path(path
);
3761 int btrfs_extent_readonly(struct btrfs_root
*root
, u64 bytenr
)
3763 struct btrfs_block_group_cache
*block_group
;
3766 block_group
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
3767 if (!block_group
|| block_group
->ro
)
3770 btrfs_put_block_group(block_group
);
3774 static const char *alloc_name(u64 flags
)
3777 case BTRFS_BLOCK_GROUP_METADATA
|BTRFS_BLOCK_GROUP_DATA
:
3779 case BTRFS_BLOCK_GROUP_METADATA
:
3781 case BTRFS_BLOCK_GROUP_DATA
:
3783 case BTRFS_BLOCK_GROUP_SYSTEM
:
3787 return "invalid-combination";
3791 static int update_space_info(struct btrfs_fs_info
*info
, u64 flags
,
3792 u64 total_bytes
, u64 bytes_used
,
3793 struct btrfs_space_info
**space_info
)
3795 struct btrfs_space_info
*found
;
3800 if (flags
& (BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID1
|
3801 BTRFS_BLOCK_GROUP_RAID10
))
3806 found
= __find_space_info(info
, flags
);
3808 spin_lock(&found
->lock
);
3809 found
->total_bytes
+= total_bytes
;
3810 found
->disk_total
+= total_bytes
* factor
;
3811 found
->bytes_used
+= bytes_used
;
3812 found
->disk_used
+= bytes_used
* factor
;
3813 if (total_bytes
> 0)
3815 spin_unlock(&found
->lock
);
3816 *space_info
= found
;
3819 found
= kzalloc(sizeof(*found
), GFP_NOFS
);
3823 ret
= percpu_counter_init(&found
->total_bytes_pinned
, 0, GFP_KERNEL
);
3829 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++)
3830 INIT_LIST_HEAD(&found
->block_groups
[i
]);
3831 init_rwsem(&found
->groups_sem
);
3832 spin_lock_init(&found
->lock
);
3833 found
->flags
= flags
& BTRFS_BLOCK_GROUP_TYPE_MASK
;
3834 found
->total_bytes
= total_bytes
;
3835 found
->disk_total
= total_bytes
* factor
;
3836 found
->bytes_used
= bytes_used
;
3837 found
->disk_used
= bytes_used
* factor
;
3838 found
->bytes_pinned
= 0;
3839 found
->bytes_reserved
= 0;
3840 found
->bytes_readonly
= 0;
3841 found
->bytes_may_use
= 0;
3843 found
->max_extent_size
= 0;
3844 found
->force_alloc
= CHUNK_ALLOC_NO_FORCE
;
3845 found
->chunk_alloc
= 0;
3847 init_waitqueue_head(&found
->wait
);
3848 INIT_LIST_HEAD(&found
->ro_bgs
);
3850 ret
= kobject_init_and_add(&found
->kobj
, &space_info_ktype
,
3851 info
->space_info_kobj
, "%s",
3852 alloc_name(found
->flags
));
3858 *space_info
= found
;
3859 list_add_rcu(&found
->list
, &info
->space_info
);
3860 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3861 info
->data_sinfo
= found
;
3866 static void set_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
3868 u64 extra_flags
= chunk_to_extended(flags
) &
3869 BTRFS_EXTENDED_PROFILE_MASK
;
3871 write_seqlock(&fs_info
->profiles_lock
);
3872 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3873 fs_info
->avail_data_alloc_bits
|= extra_flags
;
3874 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
3875 fs_info
->avail_metadata_alloc_bits
|= extra_flags
;
3876 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
3877 fs_info
->avail_system_alloc_bits
|= extra_flags
;
3878 write_sequnlock(&fs_info
->profiles_lock
);
3882 * returns target flags in extended format or 0 if restripe for this
3883 * chunk_type is not in progress
3885 * should be called with either volume_mutex or balance_lock held
3887 static u64
get_restripe_target(struct btrfs_fs_info
*fs_info
, u64 flags
)
3889 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3895 if (flags
& BTRFS_BLOCK_GROUP_DATA
&&
3896 bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3897 target
= BTRFS_BLOCK_GROUP_DATA
| bctl
->data
.target
;
3898 } else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
&&
3899 bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3900 target
= BTRFS_BLOCK_GROUP_SYSTEM
| bctl
->sys
.target
;
3901 } else if (flags
& BTRFS_BLOCK_GROUP_METADATA
&&
3902 bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3903 target
= BTRFS_BLOCK_GROUP_METADATA
| bctl
->meta
.target
;
3910 * @flags: available profiles in extended format (see ctree.h)
3912 * Returns reduced profile in chunk format. If profile changing is in
3913 * progress (either running or paused) picks the target profile (if it's
3914 * already available), otherwise falls back to plain reducing.
3916 static u64
btrfs_reduce_alloc_profile(struct btrfs_root
*root
, u64 flags
)
3918 u64 num_devices
= root
->fs_info
->fs_devices
->rw_devices
;
3924 * see if restripe for this chunk_type is in progress, if so
3925 * try to reduce to the target profile
3927 spin_lock(&root
->fs_info
->balance_lock
);
3928 target
= get_restripe_target(root
->fs_info
, flags
);
3930 /* pick target profile only if it's already available */
3931 if ((flags
& target
) & BTRFS_EXTENDED_PROFILE_MASK
) {
3932 spin_unlock(&root
->fs_info
->balance_lock
);
3933 return extended_to_chunk(target
);
3936 spin_unlock(&root
->fs_info
->balance_lock
);
3938 /* First, mask out the RAID levels which aren't possible */
3939 for (raid_type
= 0; raid_type
< BTRFS_NR_RAID_TYPES
; raid_type
++) {
3940 if (num_devices
>= btrfs_raid_array
[raid_type
].devs_min
)
3941 allowed
|= btrfs_raid_group
[raid_type
];
3945 if (allowed
& BTRFS_BLOCK_GROUP_RAID6
)
3946 allowed
= BTRFS_BLOCK_GROUP_RAID6
;
3947 else if (allowed
& BTRFS_BLOCK_GROUP_RAID5
)
3948 allowed
= BTRFS_BLOCK_GROUP_RAID5
;
3949 else if (allowed
& BTRFS_BLOCK_GROUP_RAID10
)
3950 allowed
= BTRFS_BLOCK_GROUP_RAID10
;
3951 else if (allowed
& BTRFS_BLOCK_GROUP_RAID1
)
3952 allowed
= BTRFS_BLOCK_GROUP_RAID1
;
3953 else if (allowed
& BTRFS_BLOCK_GROUP_RAID0
)
3954 allowed
= BTRFS_BLOCK_GROUP_RAID0
;
3956 flags
&= ~BTRFS_BLOCK_GROUP_PROFILE_MASK
;
3958 return extended_to_chunk(flags
| allowed
);
3961 static u64
get_alloc_profile(struct btrfs_root
*root
, u64 orig_flags
)
3968 seq
= read_seqbegin(&root
->fs_info
->profiles_lock
);
3970 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3971 flags
|= root
->fs_info
->avail_data_alloc_bits
;
3972 else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
3973 flags
|= root
->fs_info
->avail_system_alloc_bits
;
3974 else if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
3975 flags
|= root
->fs_info
->avail_metadata_alloc_bits
;
3976 } while (read_seqretry(&root
->fs_info
->profiles_lock
, seq
));
3978 return btrfs_reduce_alloc_profile(root
, flags
);
3981 u64
btrfs_get_alloc_profile(struct btrfs_root
*root
, int data
)
3987 flags
= BTRFS_BLOCK_GROUP_DATA
;
3988 else if (root
== root
->fs_info
->chunk_root
)
3989 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
3991 flags
= BTRFS_BLOCK_GROUP_METADATA
;
3993 ret
= get_alloc_profile(root
, flags
);
3997 int btrfs_alloc_data_chunk_ondemand(struct inode
*inode
, u64 bytes
)
3999 struct btrfs_space_info
*data_sinfo
;
4000 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4001 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4004 int need_commit
= 2;
4005 int have_pinned_space
;
4007 /* make sure bytes are sectorsize aligned */
4008 bytes
= ALIGN(bytes
, root
->sectorsize
);
4010 if (btrfs_is_free_space_inode(inode
)) {
4012 ASSERT(current
->journal_info
);
4015 data_sinfo
= fs_info
->data_sinfo
;
4020 /* make sure we have enough space to handle the data first */
4021 spin_lock(&data_sinfo
->lock
);
4022 used
= data_sinfo
->bytes_used
+ data_sinfo
->bytes_reserved
+
4023 data_sinfo
->bytes_pinned
+ data_sinfo
->bytes_readonly
+
4024 data_sinfo
->bytes_may_use
;
4026 if (used
+ bytes
> data_sinfo
->total_bytes
) {
4027 struct btrfs_trans_handle
*trans
;
4030 * if we don't have enough free bytes in this space then we need
4031 * to alloc a new chunk.
4033 if (!data_sinfo
->full
) {
4036 data_sinfo
->force_alloc
= CHUNK_ALLOC_FORCE
;
4037 spin_unlock(&data_sinfo
->lock
);
4039 alloc_target
= btrfs_get_alloc_profile(root
, 1);
4041 * It is ugly that we don't call nolock join
4042 * transaction for the free space inode case here.
4043 * But it is safe because we only do the data space
4044 * reservation for the free space cache in the
4045 * transaction context, the common join transaction
4046 * just increase the counter of the current transaction
4047 * handler, doesn't try to acquire the trans_lock of
4050 trans
= btrfs_join_transaction(root
);
4052 return PTR_ERR(trans
);
4054 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
4056 CHUNK_ALLOC_NO_FORCE
);
4057 btrfs_end_transaction(trans
, root
);
4062 have_pinned_space
= 1;
4068 data_sinfo
= fs_info
->data_sinfo
;
4074 * If we don't have enough pinned space to deal with this
4075 * allocation, and no removed chunk in current transaction,
4076 * don't bother committing the transaction.
4078 have_pinned_space
= percpu_counter_compare(
4079 &data_sinfo
->total_bytes_pinned
,
4080 used
+ bytes
- data_sinfo
->total_bytes
);
4081 spin_unlock(&data_sinfo
->lock
);
4083 /* commit the current transaction and try again */
4086 !atomic_read(&root
->fs_info
->open_ioctl_trans
)) {
4089 if (need_commit
> 0)
4090 btrfs_wait_ordered_roots(fs_info
, -1);
4092 trans
= btrfs_join_transaction(root
);
4094 return PTR_ERR(trans
);
4095 if (have_pinned_space
>= 0 ||
4096 test_bit(BTRFS_TRANS_HAVE_FREE_BGS
,
4097 &trans
->transaction
->flags
) ||
4099 ret
= btrfs_commit_transaction(trans
, root
);
4103 * make sure that all running delayed iput are
4106 down_write(&root
->fs_info
->delayed_iput_sem
);
4107 up_write(&root
->fs_info
->delayed_iput_sem
);
4110 btrfs_end_transaction(trans
, root
);
4114 trace_btrfs_space_reservation(root
->fs_info
,
4115 "space_info:enospc",
4116 data_sinfo
->flags
, bytes
, 1);
4119 data_sinfo
->bytes_may_use
+= bytes
;
4120 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
4121 data_sinfo
->flags
, bytes
, 1);
4122 spin_unlock(&data_sinfo
->lock
);
4128 * New check_data_free_space() with ability for precious data reservation
4129 * Will replace old btrfs_check_data_free_space(), but for patch split,
4130 * add a new function first and then replace it.
4132 int btrfs_check_data_free_space(struct inode
*inode
, u64 start
, u64 len
)
4134 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4137 /* align the range */
4138 len
= round_up(start
+ len
, root
->sectorsize
) -
4139 round_down(start
, root
->sectorsize
);
4140 start
= round_down(start
, root
->sectorsize
);
4142 ret
= btrfs_alloc_data_chunk_ondemand(inode
, len
);
4147 * Use new btrfs_qgroup_reserve_data to reserve precious data space
4149 * TODO: Find a good method to avoid reserve data space for NOCOW
4150 * range, but don't impact performance on quota disable case.
4152 ret
= btrfs_qgroup_reserve_data(inode
, start
, len
);
4157 * Called if we need to clear a data reservation for this inode
4158 * Normally in a error case.
4160 * This one will *NOT* use accurate qgroup reserved space API, just for case
4161 * which we can't sleep and is sure it won't affect qgroup reserved space.
4162 * Like clear_bit_hook().
4164 void btrfs_free_reserved_data_space_noquota(struct inode
*inode
, u64 start
,
4167 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4168 struct btrfs_space_info
*data_sinfo
;
4170 /* Make sure the range is aligned to sectorsize */
4171 len
= round_up(start
+ len
, root
->sectorsize
) -
4172 round_down(start
, root
->sectorsize
);
4173 start
= round_down(start
, root
->sectorsize
);
4175 data_sinfo
= root
->fs_info
->data_sinfo
;
4176 spin_lock(&data_sinfo
->lock
);
4177 if (WARN_ON(data_sinfo
->bytes_may_use
< len
))
4178 data_sinfo
->bytes_may_use
= 0;
4180 data_sinfo
->bytes_may_use
-= len
;
4181 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
4182 data_sinfo
->flags
, len
, 0);
4183 spin_unlock(&data_sinfo
->lock
);
4187 * Called if we need to clear a data reservation for this inode
4188 * Normally in a error case.
4190 * This one will handle the per-indoe data rsv map for accurate reserved
4193 void btrfs_free_reserved_data_space(struct inode
*inode
, u64 start
, u64 len
)
4195 btrfs_free_reserved_data_space_noquota(inode
, start
, len
);
4196 btrfs_qgroup_free_data(inode
, start
, len
);
4199 static void force_metadata_allocation(struct btrfs_fs_info
*info
)
4201 struct list_head
*head
= &info
->space_info
;
4202 struct btrfs_space_info
*found
;
4205 list_for_each_entry_rcu(found
, head
, list
) {
4206 if (found
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
4207 found
->force_alloc
= CHUNK_ALLOC_FORCE
;
4212 static inline u64
calc_global_rsv_need_space(struct btrfs_block_rsv
*global
)
4214 return (global
->size
<< 1);
4217 static int should_alloc_chunk(struct btrfs_root
*root
,
4218 struct btrfs_space_info
*sinfo
, int force
)
4220 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
4221 u64 num_bytes
= sinfo
->total_bytes
- sinfo
->bytes_readonly
;
4222 u64 num_allocated
= sinfo
->bytes_used
+ sinfo
->bytes_reserved
;
4225 if (force
== CHUNK_ALLOC_FORCE
)
4229 * We need to take into account the global rsv because for all intents
4230 * and purposes it's used space. Don't worry about locking the
4231 * global_rsv, it doesn't change except when the transaction commits.
4233 if (sinfo
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
4234 num_allocated
+= calc_global_rsv_need_space(global_rsv
);
4237 * in limited mode, we want to have some free space up to
4238 * about 1% of the FS size.
4240 if (force
== CHUNK_ALLOC_LIMITED
) {
4241 thresh
= btrfs_super_total_bytes(root
->fs_info
->super_copy
);
4242 thresh
= max_t(u64
, 64 * 1024 * 1024,
4243 div_factor_fine(thresh
, 1));
4245 if (num_bytes
- num_allocated
< thresh
)
4249 if (num_allocated
+ 2 * 1024 * 1024 < div_factor(num_bytes
, 8))
4254 static u64
get_profile_num_devs(struct btrfs_root
*root
, u64 type
)
4258 if (type
& (BTRFS_BLOCK_GROUP_RAID10
|
4259 BTRFS_BLOCK_GROUP_RAID0
|
4260 BTRFS_BLOCK_GROUP_RAID5
|
4261 BTRFS_BLOCK_GROUP_RAID6
))
4262 num_dev
= root
->fs_info
->fs_devices
->rw_devices
;
4263 else if (type
& BTRFS_BLOCK_GROUP_RAID1
)
4266 num_dev
= 1; /* DUP or single */
4272 * If @is_allocation is true, reserve space in the system space info necessary
4273 * for allocating a chunk, otherwise if it's false, reserve space necessary for
4276 void check_system_chunk(struct btrfs_trans_handle
*trans
,
4277 struct btrfs_root
*root
,
4280 struct btrfs_space_info
*info
;
4287 * Needed because we can end up allocating a system chunk and for an
4288 * atomic and race free space reservation in the chunk block reserve.
4290 ASSERT(mutex_is_locked(&root
->fs_info
->chunk_mutex
));
4292 info
= __find_space_info(root
->fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
4293 spin_lock(&info
->lock
);
4294 left
= info
->total_bytes
- info
->bytes_used
- info
->bytes_pinned
-
4295 info
->bytes_reserved
- info
->bytes_readonly
-
4296 info
->bytes_may_use
;
4297 spin_unlock(&info
->lock
);
4299 num_devs
= get_profile_num_devs(root
, type
);
4301 /* num_devs device items to update and 1 chunk item to add or remove */
4302 thresh
= btrfs_calc_trunc_metadata_size(root
, num_devs
) +
4303 btrfs_calc_trans_metadata_size(root
, 1);
4305 if (left
< thresh
&& btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
4306 btrfs_info(root
->fs_info
, "left=%llu, need=%llu, flags=%llu",
4307 left
, thresh
, type
);
4308 dump_space_info(info
, 0, 0);
4311 if (left
< thresh
) {
4314 flags
= btrfs_get_alloc_profile(root
->fs_info
->chunk_root
, 0);
4316 * Ignore failure to create system chunk. We might end up not
4317 * needing it, as we might not need to COW all nodes/leafs from
4318 * the paths we visit in the chunk tree (they were already COWed
4319 * or created in the current transaction for example).
4321 ret
= btrfs_alloc_chunk(trans
, root
, flags
);
4325 ret
= btrfs_block_rsv_add(root
->fs_info
->chunk_root
,
4326 &root
->fs_info
->chunk_block_rsv
,
4327 thresh
, BTRFS_RESERVE_NO_FLUSH
);
4329 trans
->chunk_bytes_reserved
+= thresh
;
4333 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
,
4334 struct btrfs_root
*extent_root
, u64 flags
, int force
)
4336 struct btrfs_space_info
*space_info
;
4337 struct btrfs_fs_info
*fs_info
= extent_root
->fs_info
;
4338 int wait_for_alloc
= 0;
4341 /* Don't re-enter if we're already allocating a chunk */
4342 if (trans
->allocating_chunk
)
4345 space_info
= __find_space_info(extent_root
->fs_info
, flags
);
4347 ret
= update_space_info(extent_root
->fs_info
, flags
,
4349 BUG_ON(ret
); /* -ENOMEM */
4351 BUG_ON(!space_info
); /* Logic error */
4354 spin_lock(&space_info
->lock
);
4355 if (force
< space_info
->force_alloc
)
4356 force
= space_info
->force_alloc
;
4357 if (space_info
->full
) {
4358 if (should_alloc_chunk(extent_root
, space_info
, force
))
4362 spin_unlock(&space_info
->lock
);
4366 if (!should_alloc_chunk(extent_root
, space_info
, force
)) {
4367 spin_unlock(&space_info
->lock
);
4369 } else if (space_info
->chunk_alloc
) {
4372 space_info
->chunk_alloc
= 1;
4375 spin_unlock(&space_info
->lock
);
4377 mutex_lock(&fs_info
->chunk_mutex
);
4380 * The chunk_mutex is held throughout the entirety of a chunk
4381 * allocation, so once we've acquired the chunk_mutex we know that the
4382 * other guy is done and we need to recheck and see if we should
4385 if (wait_for_alloc
) {
4386 mutex_unlock(&fs_info
->chunk_mutex
);
4391 trans
->allocating_chunk
= true;
4394 * If we have mixed data/metadata chunks we want to make sure we keep
4395 * allocating mixed chunks instead of individual chunks.
4397 if (btrfs_mixed_space_info(space_info
))
4398 flags
|= (BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
);
4401 * if we're doing a data chunk, go ahead and make sure that
4402 * we keep a reasonable number of metadata chunks allocated in the
4405 if (flags
& BTRFS_BLOCK_GROUP_DATA
&& fs_info
->metadata_ratio
) {
4406 fs_info
->data_chunk_allocations
++;
4407 if (!(fs_info
->data_chunk_allocations
%
4408 fs_info
->metadata_ratio
))
4409 force_metadata_allocation(fs_info
);
4413 * Check if we have enough space in SYSTEM chunk because we may need
4414 * to update devices.
4416 check_system_chunk(trans
, extent_root
, flags
);
4418 ret
= btrfs_alloc_chunk(trans
, extent_root
, flags
);
4419 trans
->allocating_chunk
= false;
4421 spin_lock(&space_info
->lock
);
4422 if (ret
< 0 && ret
!= -ENOSPC
)
4425 space_info
->full
= 1;
4429 space_info
->force_alloc
= CHUNK_ALLOC_NO_FORCE
;
4431 space_info
->chunk_alloc
= 0;
4432 spin_unlock(&space_info
->lock
);
4433 mutex_unlock(&fs_info
->chunk_mutex
);
4435 * When we allocate a new chunk we reserve space in the chunk block
4436 * reserve to make sure we can COW nodes/leafs in the chunk tree or
4437 * add new nodes/leafs to it if we end up needing to do it when
4438 * inserting the chunk item and updating device items as part of the
4439 * second phase of chunk allocation, performed by
4440 * btrfs_finish_chunk_alloc(). So make sure we don't accumulate a
4441 * large number of new block groups to create in our transaction
4442 * handle's new_bgs list to avoid exhausting the chunk block reserve
4443 * in extreme cases - like having a single transaction create many new
4444 * block groups when starting to write out the free space caches of all
4445 * the block groups that were made dirty during the lifetime of the
4448 if (trans
->can_flush_pending_bgs
&&
4449 trans
->chunk_bytes_reserved
>= (2 * 1024 * 1024ull)) {
4450 btrfs_create_pending_block_groups(trans
, trans
->root
);
4451 btrfs_trans_release_chunk_metadata(trans
);
4456 static int can_overcommit(struct btrfs_root
*root
,
4457 struct btrfs_space_info
*space_info
, u64 bytes
,
4458 enum btrfs_reserve_flush_enum flush
)
4460 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
4461 u64 profile
= btrfs_get_alloc_profile(root
, 0);
4466 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4467 space_info
->bytes_pinned
+ space_info
->bytes_readonly
;
4470 * We only want to allow over committing if we have lots of actual space
4471 * free, but if we don't have enough space to handle the global reserve
4472 * space then we could end up having a real enospc problem when trying
4473 * to allocate a chunk or some other such important allocation.
4475 spin_lock(&global_rsv
->lock
);
4476 space_size
= calc_global_rsv_need_space(global_rsv
);
4477 spin_unlock(&global_rsv
->lock
);
4478 if (used
+ space_size
>= space_info
->total_bytes
)
4481 used
+= space_info
->bytes_may_use
;
4483 spin_lock(&root
->fs_info
->free_chunk_lock
);
4484 avail
= root
->fs_info
->free_chunk_space
;
4485 spin_unlock(&root
->fs_info
->free_chunk_lock
);
4488 * If we have dup, raid1 or raid10 then only half of the free
4489 * space is actually useable. For raid56, the space info used
4490 * doesn't include the parity drive, so we don't have to
4493 if (profile
& (BTRFS_BLOCK_GROUP_DUP
|
4494 BTRFS_BLOCK_GROUP_RAID1
|
4495 BTRFS_BLOCK_GROUP_RAID10
))
4499 * If we aren't flushing all things, let us overcommit up to
4500 * 1/2th of the space. If we can flush, don't let us overcommit
4501 * too much, let it overcommit up to 1/8 of the space.
4503 if (flush
== BTRFS_RESERVE_FLUSH_ALL
)
4508 if (used
+ bytes
< space_info
->total_bytes
+ avail
)
4513 static void btrfs_writeback_inodes_sb_nr(struct btrfs_root
*root
,
4514 unsigned long nr_pages
, int nr_items
)
4516 struct super_block
*sb
= root
->fs_info
->sb
;
4518 if (down_read_trylock(&sb
->s_umount
)) {
4519 writeback_inodes_sb_nr(sb
, nr_pages
, WB_REASON_FS_FREE_SPACE
);
4520 up_read(&sb
->s_umount
);
4523 * We needn't worry the filesystem going from r/w to r/o though
4524 * we don't acquire ->s_umount mutex, because the filesystem
4525 * should guarantee the delalloc inodes list be empty after
4526 * the filesystem is readonly(all dirty pages are written to
4529 btrfs_start_delalloc_roots(root
->fs_info
, 0, nr_items
);
4530 if (!current
->journal_info
)
4531 btrfs_wait_ordered_roots(root
->fs_info
, nr_items
);
4535 static inline int calc_reclaim_items_nr(struct btrfs_root
*root
, u64 to_reclaim
)
4540 bytes
= btrfs_calc_trans_metadata_size(root
, 1);
4541 nr
= (int)div64_u64(to_reclaim
, bytes
);
4547 #define EXTENT_SIZE_PER_ITEM (256 * 1024)
4550 * shrink metadata reservation for delalloc
4552 static void shrink_delalloc(struct btrfs_root
*root
, u64 to_reclaim
, u64 orig
,
4555 struct btrfs_block_rsv
*block_rsv
;
4556 struct btrfs_space_info
*space_info
;
4557 struct btrfs_trans_handle
*trans
;
4561 unsigned long nr_pages
;
4564 enum btrfs_reserve_flush_enum flush
;
4566 /* Calc the number of the pages we need flush for space reservation */
4567 items
= calc_reclaim_items_nr(root
, to_reclaim
);
4568 to_reclaim
= items
* EXTENT_SIZE_PER_ITEM
;
4570 trans
= (struct btrfs_trans_handle
*)current
->journal_info
;
4571 block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
4572 space_info
= block_rsv
->space_info
;
4574 delalloc_bytes
= percpu_counter_sum_positive(
4575 &root
->fs_info
->delalloc_bytes
);
4576 if (delalloc_bytes
== 0) {
4580 btrfs_wait_ordered_roots(root
->fs_info
, items
);
4585 while (delalloc_bytes
&& loops
< 3) {
4586 max_reclaim
= min(delalloc_bytes
, to_reclaim
);
4587 nr_pages
= max_reclaim
>> PAGE_CACHE_SHIFT
;
4588 btrfs_writeback_inodes_sb_nr(root
, nr_pages
, items
);
4590 * We need to wait for the async pages to actually start before
4593 max_reclaim
= atomic_read(&root
->fs_info
->async_delalloc_pages
);
4597 if (max_reclaim
<= nr_pages
)
4600 max_reclaim
-= nr_pages
;
4602 wait_event(root
->fs_info
->async_submit_wait
,
4603 atomic_read(&root
->fs_info
->async_delalloc_pages
) <=
4607 flush
= BTRFS_RESERVE_FLUSH_ALL
;
4609 flush
= BTRFS_RESERVE_NO_FLUSH
;
4610 spin_lock(&space_info
->lock
);
4611 if (can_overcommit(root
, space_info
, orig
, flush
)) {
4612 spin_unlock(&space_info
->lock
);
4615 spin_unlock(&space_info
->lock
);
4618 if (wait_ordered
&& !trans
) {
4619 btrfs_wait_ordered_roots(root
->fs_info
, items
);
4621 time_left
= schedule_timeout_killable(1);
4625 delalloc_bytes
= percpu_counter_sum_positive(
4626 &root
->fs_info
->delalloc_bytes
);
4631 * maybe_commit_transaction - possibly commit the transaction if its ok to
4632 * @root - the root we're allocating for
4633 * @bytes - the number of bytes we want to reserve
4634 * @force - force the commit
4636 * This will check to make sure that committing the transaction will actually
4637 * get us somewhere and then commit the transaction if it does. Otherwise it
4638 * will return -ENOSPC.
4640 static int may_commit_transaction(struct btrfs_root
*root
,
4641 struct btrfs_space_info
*space_info
,
4642 u64 bytes
, int force
)
4644 struct btrfs_block_rsv
*delayed_rsv
= &root
->fs_info
->delayed_block_rsv
;
4645 struct btrfs_trans_handle
*trans
;
4647 trans
= (struct btrfs_trans_handle
*)current
->journal_info
;
4654 /* See if there is enough pinned space to make this reservation */
4655 if (percpu_counter_compare(&space_info
->total_bytes_pinned
,
4660 * See if there is some space in the delayed insertion reservation for
4663 if (space_info
!= delayed_rsv
->space_info
)
4666 spin_lock(&delayed_rsv
->lock
);
4667 if (percpu_counter_compare(&space_info
->total_bytes_pinned
,
4668 bytes
- delayed_rsv
->size
) >= 0) {
4669 spin_unlock(&delayed_rsv
->lock
);
4672 spin_unlock(&delayed_rsv
->lock
);
4675 trans
= btrfs_join_transaction(root
);
4679 return btrfs_commit_transaction(trans
, root
);
4683 FLUSH_DELAYED_ITEMS_NR
= 1,
4684 FLUSH_DELAYED_ITEMS
= 2,
4686 FLUSH_DELALLOC_WAIT
= 4,
4691 static int flush_space(struct btrfs_root
*root
,
4692 struct btrfs_space_info
*space_info
, u64 num_bytes
,
4693 u64 orig_bytes
, int state
)
4695 struct btrfs_trans_handle
*trans
;
4700 case FLUSH_DELAYED_ITEMS_NR
:
4701 case FLUSH_DELAYED_ITEMS
:
4702 if (state
== FLUSH_DELAYED_ITEMS_NR
)
4703 nr
= calc_reclaim_items_nr(root
, num_bytes
) * 2;
4707 trans
= btrfs_join_transaction(root
);
4708 if (IS_ERR(trans
)) {
4709 ret
= PTR_ERR(trans
);
4712 ret
= btrfs_run_delayed_items_nr(trans
, root
, nr
);
4713 btrfs_end_transaction(trans
, root
);
4715 case FLUSH_DELALLOC
:
4716 case FLUSH_DELALLOC_WAIT
:
4717 shrink_delalloc(root
, num_bytes
* 2, orig_bytes
,
4718 state
== FLUSH_DELALLOC_WAIT
);
4721 trans
= btrfs_join_transaction(root
);
4722 if (IS_ERR(trans
)) {
4723 ret
= PTR_ERR(trans
);
4726 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
4727 btrfs_get_alloc_profile(root
, 0),
4728 CHUNK_ALLOC_NO_FORCE
);
4729 btrfs_end_transaction(trans
, root
);
4734 ret
= may_commit_transaction(root
, space_info
, orig_bytes
, 0);
4745 btrfs_calc_reclaim_metadata_size(struct btrfs_root
*root
,
4746 struct btrfs_space_info
*space_info
)
4752 to_reclaim
= min_t(u64
, num_online_cpus() * 1024 * 1024,
4754 spin_lock(&space_info
->lock
);
4755 if (can_overcommit(root
, space_info
, to_reclaim
,
4756 BTRFS_RESERVE_FLUSH_ALL
)) {
4761 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4762 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4763 space_info
->bytes_may_use
;
4764 if (can_overcommit(root
, space_info
, 1024 * 1024,
4765 BTRFS_RESERVE_FLUSH_ALL
))
4766 expected
= div_factor_fine(space_info
->total_bytes
, 95);
4768 expected
= div_factor_fine(space_info
->total_bytes
, 90);
4770 if (used
> expected
)
4771 to_reclaim
= used
- expected
;
4774 to_reclaim
= min(to_reclaim
, space_info
->bytes_may_use
+
4775 space_info
->bytes_reserved
);
4777 spin_unlock(&space_info
->lock
);
4782 static inline int need_do_async_reclaim(struct btrfs_space_info
*space_info
,
4783 struct btrfs_fs_info
*fs_info
, u64 used
)
4785 u64 thresh
= div_factor_fine(space_info
->total_bytes
, 98);
4787 /* If we're just plain full then async reclaim just slows us down. */
4788 if (space_info
->bytes_used
>= thresh
)
4791 return (used
>= thresh
&& !btrfs_fs_closing(fs_info
) &&
4792 !test_bit(BTRFS_FS_STATE_REMOUNTING
, &fs_info
->fs_state
));
4795 static int btrfs_need_do_async_reclaim(struct btrfs_space_info
*space_info
,
4796 struct btrfs_fs_info
*fs_info
,
4801 spin_lock(&space_info
->lock
);
4803 * We run out of space and have not got any free space via flush_space,
4804 * so don't bother doing async reclaim.
4806 if (flush_state
> COMMIT_TRANS
&& space_info
->full
) {
4807 spin_unlock(&space_info
->lock
);
4811 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4812 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4813 space_info
->bytes_may_use
;
4814 if (need_do_async_reclaim(space_info
, fs_info
, used
)) {
4815 spin_unlock(&space_info
->lock
);
4818 spin_unlock(&space_info
->lock
);
4823 static void btrfs_async_reclaim_metadata_space(struct work_struct
*work
)
4825 struct btrfs_fs_info
*fs_info
;
4826 struct btrfs_space_info
*space_info
;
4830 fs_info
= container_of(work
, struct btrfs_fs_info
, async_reclaim_work
);
4831 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4833 to_reclaim
= btrfs_calc_reclaim_metadata_size(fs_info
->fs_root
,
4838 flush_state
= FLUSH_DELAYED_ITEMS_NR
;
4840 flush_space(fs_info
->fs_root
, space_info
, to_reclaim
,
4841 to_reclaim
, flush_state
);
4843 if (!btrfs_need_do_async_reclaim(space_info
, fs_info
,
4846 } while (flush_state
< COMMIT_TRANS
);
4849 void btrfs_init_async_reclaim_work(struct work_struct
*work
)
4851 INIT_WORK(work
, btrfs_async_reclaim_metadata_space
);
4855 * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
4856 * @root - the root we're allocating for
4857 * @block_rsv - the block_rsv we're allocating for
4858 * @orig_bytes - the number of bytes we want
4859 * @flush - whether or not we can flush to make our reservation
4861 * This will reserve orgi_bytes number of bytes from the space info associated
4862 * with the block_rsv. If there is not enough space it will make an attempt to
4863 * flush out space to make room. It will do this by flushing delalloc if
4864 * possible or committing the transaction. If flush is 0 then no attempts to
4865 * regain reservations will be made and this will fail if there is not enough
4868 static int reserve_metadata_bytes(struct btrfs_root
*root
,
4869 struct btrfs_block_rsv
*block_rsv
,
4871 enum btrfs_reserve_flush_enum flush
)
4873 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
4875 u64 num_bytes
= orig_bytes
;
4876 int flush_state
= FLUSH_DELAYED_ITEMS_NR
;
4878 bool flushing
= false;
4882 spin_lock(&space_info
->lock
);
4884 * We only want to wait if somebody other than us is flushing and we
4885 * are actually allowed to flush all things.
4887 while (flush
== BTRFS_RESERVE_FLUSH_ALL
&& !flushing
&&
4888 space_info
->flush
) {
4889 spin_unlock(&space_info
->lock
);
4891 * If we have a trans handle we can't wait because the flusher
4892 * may have to commit the transaction, which would mean we would
4893 * deadlock since we are waiting for the flusher to finish, but
4894 * hold the current transaction open.
4896 if (current
->journal_info
)
4898 ret
= wait_event_killable(space_info
->wait
, !space_info
->flush
);
4899 /* Must have been killed, return */
4903 spin_lock(&space_info
->lock
);
4907 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4908 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4909 space_info
->bytes_may_use
;
4912 * The idea here is that we've not already over-reserved the block group
4913 * then we can go ahead and save our reservation first and then start
4914 * flushing if we need to. Otherwise if we've already overcommitted
4915 * lets start flushing stuff first and then come back and try to make
4918 if (used
<= space_info
->total_bytes
) {
4919 if (used
+ orig_bytes
<= space_info
->total_bytes
) {
4920 space_info
->bytes_may_use
+= orig_bytes
;
4921 trace_btrfs_space_reservation(root
->fs_info
,
4922 "space_info", space_info
->flags
, orig_bytes
, 1);
4926 * Ok set num_bytes to orig_bytes since we aren't
4927 * overocmmitted, this way we only try and reclaim what
4930 num_bytes
= orig_bytes
;
4934 * Ok we're over committed, set num_bytes to the overcommitted
4935 * amount plus the amount of bytes that we need for this
4938 num_bytes
= used
- space_info
->total_bytes
+
4942 if (ret
&& can_overcommit(root
, space_info
, orig_bytes
, flush
)) {
4943 space_info
->bytes_may_use
+= orig_bytes
;
4944 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
4945 space_info
->flags
, orig_bytes
,
4951 * Couldn't make our reservation, save our place so while we're trying
4952 * to reclaim space we can actually use it instead of somebody else
4953 * stealing it from us.
4955 * We make the other tasks wait for the flush only when we can flush
4958 if (ret
&& flush
!= BTRFS_RESERVE_NO_FLUSH
) {
4960 space_info
->flush
= 1;
4961 } else if (!ret
&& space_info
->flags
& BTRFS_BLOCK_GROUP_METADATA
) {
4964 * We will do the space reservation dance during log replay,
4965 * which means we won't have fs_info->fs_root set, so don't do
4966 * the async reclaim as we will panic.
4968 if (!root
->fs_info
->log_root_recovering
&&
4969 need_do_async_reclaim(space_info
, root
->fs_info
, used
) &&
4970 !work_busy(&root
->fs_info
->async_reclaim_work
))
4971 queue_work(system_unbound_wq
,
4972 &root
->fs_info
->async_reclaim_work
);
4974 spin_unlock(&space_info
->lock
);
4976 if (!ret
|| flush
== BTRFS_RESERVE_NO_FLUSH
)
4979 ret
= flush_space(root
, space_info
, num_bytes
, orig_bytes
,
4984 * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock
4985 * would happen. So skip delalloc flush.
4987 if (flush
== BTRFS_RESERVE_FLUSH_LIMIT
&&
4988 (flush_state
== FLUSH_DELALLOC
||
4989 flush_state
== FLUSH_DELALLOC_WAIT
))
4990 flush_state
= ALLOC_CHUNK
;
4994 else if (flush
== BTRFS_RESERVE_FLUSH_LIMIT
&&
4995 flush_state
< COMMIT_TRANS
)
4997 else if (flush
== BTRFS_RESERVE_FLUSH_ALL
&&
4998 flush_state
<= COMMIT_TRANS
)
5002 if (ret
== -ENOSPC
&&
5003 unlikely(root
->orphan_cleanup_state
== ORPHAN_CLEANUP_STARTED
)) {
5004 struct btrfs_block_rsv
*global_rsv
=
5005 &root
->fs_info
->global_block_rsv
;
5007 if (block_rsv
!= global_rsv
&&
5008 !block_rsv_use_bytes(global_rsv
, orig_bytes
))
5012 trace_btrfs_space_reservation(root
->fs_info
,
5013 "space_info:enospc",
5014 space_info
->flags
, orig_bytes
, 1);
5016 spin_lock(&space_info
->lock
);
5017 space_info
->flush
= 0;
5018 wake_up_all(&space_info
->wait
);
5019 spin_unlock(&space_info
->lock
);
5024 static struct btrfs_block_rsv
*get_block_rsv(
5025 const struct btrfs_trans_handle
*trans
,
5026 const struct btrfs_root
*root
)
5028 struct btrfs_block_rsv
*block_rsv
= NULL
;
5030 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) ||
5031 (root
== root
->fs_info
->csum_root
&& trans
->adding_csums
) ||
5032 (root
== root
->fs_info
->uuid_root
))
5033 block_rsv
= trans
->block_rsv
;
5036 block_rsv
= root
->block_rsv
;
5039 block_rsv
= &root
->fs_info
->empty_block_rsv
;
5044 static int block_rsv_use_bytes(struct btrfs_block_rsv
*block_rsv
,
5048 spin_lock(&block_rsv
->lock
);
5049 if (block_rsv
->reserved
>= num_bytes
) {
5050 block_rsv
->reserved
-= num_bytes
;
5051 if (block_rsv
->reserved
< block_rsv
->size
)
5052 block_rsv
->full
= 0;
5055 spin_unlock(&block_rsv
->lock
);
5059 static void block_rsv_add_bytes(struct btrfs_block_rsv
*block_rsv
,
5060 u64 num_bytes
, int update_size
)
5062 spin_lock(&block_rsv
->lock
);
5063 block_rsv
->reserved
+= num_bytes
;
5065 block_rsv
->size
+= num_bytes
;
5066 else if (block_rsv
->reserved
>= block_rsv
->size
)
5067 block_rsv
->full
= 1;
5068 spin_unlock(&block_rsv
->lock
);
5071 int btrfs_cond_migrate_bytes(struct btrfs_fs_info
*fs_info
,
5072 struct btrfs_block_rsv
*dest
, u64 num_bytes
,
5075 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
5078 if (global_rsv
->space_info
!= dest
->space_info
)
5081 spin_lock(&global_rsv
->lock
);
5082 min_bytes
= div_factor(global_rsv
->size
, min_factor
);
5083 if (global_rsv
->reserved
< min_bytes
+ num_bytes
) {
5084 spin_unlock(&global_rsv
->lock
);
5087 global_rsv
->reserved
-= num_bytes
;
5088 if (global_rsv
->reserved
< global_rsv
->size
)
5089 global_rsv
->full
= 0;
5090 spin_unlock(&global_rsv
->lock
);
5092 block_rsv_add_bytes(dest
, num_bytes
, 1);
5096 static void block_rsv_release_bytes(struct btrfs_fs_info
*fs_info
,
5097 struct btrfs_block_rsv
*block_rsv
,
5098 struct btrfs_block_rsv
*dest
, u64 num_bytes
)
5100 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
5102 spin_lock(&block_rsv
->lock
);
5103 if (num_bytes
== (u64
)-1)
5104 num_bytes
= block_rsv
->size
;
5105 block_rsv
->size
-= num_bytes
;
5106 if (block_rsv
->reserved
>= block_rsv
->size
) {
5107 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
5108 block_rsv
->reserved
= block_rsv
->size
;
5109 block_rsv
->full
= 1;
5113 spin_unlock(&block_rsv
->lock
);
5115 if (num_bytes
> 0) {
5117 spin_lock(&dest
->lock
);
5121 bytes_to_add
= dest
->size
- dest
->reserved
;
5122 bytes_to_add
= min(num_bytes
, bytes_to_add
);
5123 dest
->reserved
+= bytes_to_add
;
5124 if (dest
->reserved
>= dest
->size
)
5126 num_bytes
-= bytes_to_add
;
5128 spin_unlock(&dest
->lock
);
5131 spin_lock(&space_info
->lock
);
5132 space_info
->bytes_may_use
-= num_bytes
;
5133 trace_btrfs_space_reservation(fs_info
, "space_info",
5134 space_info
->flags
, num_bytes
, 0);
5135 spin_unlock(&space_info
->lock
);
5140 static int block_rsv_migrate_bytes(struct btrfs_block_rsv
*src
,
5141 struct btrfs_block_rsv
*dst
, u64 num_bytes
)
5145 ret
= block_rsv_use_bytes(src
, num_bytes
);
5149 block_rsv_add_bytes(dst
, num_bytes
, 1);
5153 void btrfs_init_block_rsv(struct btrfs_block_rsv
*rsv
, unsigned short type
)
5155 memset(rsv
, 0, sizeof(*rsv
));
5156 spin_lock_init(&rsv
->lock
);
5160 struct btrfs_block_rsv
*btrfs_alloc_block_rsv(struct btrfs_root
*root
,
5161 unsigned short type
)
5163 struct btrfs_block_rsv
*block_rsv
;
5164 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5166 block_rsv
= kmalloc(sizeof(*block_rsv
), GFP_NOFS
);
5170 btrfs_init_block_rsv(block_rsv
, type
);
5171 block_rsv
->space_info
= __find_space_info(fs_info
,
5172 BTRFS_BLOCK_GROUP_METADATA
);
5176 void btrfs_free_block_rsv(struct btrfs_root
*root
,
5177 struct btrfs_block_rsv
*rsv
)
5181 btrfs_block_rsv_release(root
, rsv
, (u64
)-1);
5185 void __btrfs_free_block_rsv(struct btrfs_block_rsv
*rsv
)
5190 int btrfs_block_rsv_add(struct btrfs_root
*root
,
5191 struct btrfs_block_rsv
*block_rsv
, u64 num_bytes
,
5192 enum btrfs_reserve_flush_enum flush
)
5199 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
5201 block_rsv_add_bytes(block_rsv
, num_bytes
, 1);
5208 int btrfs_block_rsv_check(struct btrfs_root
*root
,
5209 struct btrfs_block_rsv
*block_rsv
, int min_factor
)
5217 spin_lock(&block_rsv
->lock
);
5218 num_bytes
= div_factor(block_rsv
->size
, min_factor
);
5219 if (block_rsv
->reserved
>= num_bytes
)
5221 spin_unlock(&block_rsv
->lock
);
5226 int btrfs_block_rsv_refill(struct btrfs_root
*root
,
5227 struct btrfs_block_rsv
*block_rsv
, u64 min_reserved
,
5228 enum btrfs_reserve_flush_enum flush
)
5236 spin_lock(&block_rsv
->lock
);
5237 num_bytes
= min_reserved
;
5238 if (block_rsv
->reserved
>= num_bytes
)
5241 num_bytes
-= block_rsv
->reserved
;
5242 spin_unlock(&block_rsv
->lock
);
5247 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
5249 block_rsv_add_bytes(block_rsv
, num_bytes
, 0);
5256 int btrfs_block_rsv_migrate(struct btrfs_block_rsv
*src_rsv
,
5257 struct btrfs_block_rsv
*dst_rsv
,
5260 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
5263 void btrfs_block_rsv_release(struct btrfs_root
*root
,
5264 struct btrfs_block_rsv
*block_rsv
,
5267 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
5268 if (global_rsv
== block_rsv
||
5269 block_rsv
->space_info
!= global_rsv
->space_info
)
5271 block_rsv_release_bytes(root
->fs_info
, block_rsv
, global_rsv
,
5276 * helper to calculate size of global block reservation.
5277 * the desired value is sum of space used by extent tree,
5278 * checksum tree and root tree
5280 static u64
calc_global_metadata_size(struct btrfs_fs_info
*fs_info
)
5282 struct btrfs_space_info
*sinfo
;
5286 int csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
5288 sinfo
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_DATA
);
5289 spin_lock(&sinfo
->lock
);
5290 data_used
= sinfo
->bytes_used
;
5291 spin_unlock(&sinfo
->lock
);
5293 sinfo
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
5294 spin_lock(&sinfo
->lock
);
5295 if (sinfo
->flags
& BTRFS_BLOCK_GROUP_DATA
)
5297 meta_used
= sinfo
->bytes_used
;
5298 spin_unlock(&sinfo
->lock
);
5300 num_bytes
= (data_used
>> fs_info
->sb
->s_blocksize_bits
) *
5302 num_bytes
+= div_u64(data_used
+ meta_used
, 50);
5304 if (num_bytes
* 3 > meta_used
)
5305 num_bytes
= div_u64(meta_used
, 3);
5307 return ALIGN(num_bytes
, fs_info
->extent_root
->nodesize
<< 10);
5310 static void update_global_block_rsv(struct btrfs_fs_info
*fs_info
)
5312 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
5313 struct btrfs_space_info
*sinfo
= block_rsv
->space_info
;
5316 num_bytes
= calc_global_metadata_size(fs_info
);
5318 spin_lock(&sinfo
->lock
);
5319 spin_lock(&block_rsv
->lock
);
5321 block_rsv
->size
= min_t(u64
, num_bytes
, 512 * 1024 * 1024);
5323 num_bytes
= sinfo
->bytes_used
+ sinfo
->bytes_pinned
+
5324 sinfo
->bytes_reserved
+ sinfo
->bytes_readonly
+
5325 sinfo
->bytes_may_use
;
5327 if (sinfo
->total_bytes
> num_bytes
) {
5328 num_bytes
= sinfo
->total_bytes
- num_bytes
;
5329 block_rsv
->reserved
+= num_bytes
;
5330 sinfo
->bytes_may_use
+= num_bytes
;
5331 trace_btrfs_space_reservation(fs_info
, "space_info",
5332 sinfo
->flags
, num_bytes
, 1);
5335 if (block_rsv
->reserved
>= block_rsv
->size
) {
5336 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
5337 sinfo
->bytes_may_use
-= num_bytes
;
5338 trace_btrfs_space_reservation(fs_info
, "space_info",
5339 sinfo
->flags
, num_bytes
, 0);
5340 block_rsv
->reserved
= block_rsv
->size
;
5341 block_rsv
->full
= 1;
5344 spin_unlock(&block_rsv
->lock
);
5345 spin_unlock(&sinfo
->lock
);
5348 static void init_global_block_rsv(struct btrfs_fs_info
*fs_info
)
5350 struct btrfs_space_info
*space_info
;
5352 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
5353 fs_info
->chunk_block_rsv
.space_info
= space_info
;
5355 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
5356 fs_info
->global_block_rsv
.space_info
= space_info
;
5357 fs_info
->delalloc_block_rsv
.space_info
= space_info
;
5358 fs_info
->trans_block_rsv
.space_info
= space_info
;
5359 fs_info
->empty_block_rsv
.space_info
= space_info
;
5360 fs_info
->delayed_block_rsv
.space_info
= space_info
;
5362 fs_info
->extent_root
->block_rsv
= &fs_info
->global_block_rsv
;
5363 fs_info
->csum_root
->block_rsv
= &fs_info
->global_block_rsv
;
5364 fs_info
->dev_root
->block_rsv
= &fs_info
->global_block_rsv
;
5365 fs_info
->tree_root
->block_rsv
= &fs_info
->global_block_rsv
;
5366 if (fs_info
->quota_root
)
5367 fs_info
->quota_root
->block_rsv
= &fs_info
->global_block_rsv
;
5368 fs_info
->chunk_root
->block_rsv
= &fs_info
->chunk_block_rsv
;
5370 update_global_block_rsv(fs_info
);
5373 static void release_global_block_rsv(struct btrfs_fs_info
*fs_info
)
5375 block_rsv_release_bytes(fs_info
, &fs_info
->global_block_rsv
, NULL
,
5377 WARN_ON(fs_info
->delalloc_block_rsv
.size
> 0);
5378 WARN_ON(fs_info
->delalloc_block_rsv
.reserved
> 0);
5379 WARN_ON(fs_info
->trans_block_rsv
.size
> 0);
5380 WARN_ON(fs_info
->trans_block_rsv
.reserved
> 0);
5381 WARN_ON(fs_info
->chunk_block_rsv
.size
> 0);
5382 WARN_ON(fs_info
->chunk_block_rsv
.reserved
> 0);
5383 WARN_ON(fs_info
->delayed_block_rsv
.size
> 0);
5384 WARN_ON(fs_info
->delayed_block_rsv
.reserved
> 0);
5387 void btrfs_trans_release_metadata(struct btrfs_trans_handle
*trans
,
5388 struct btrfs_root
*root
)
5390 if (!trans
->block_rsv
)
5393 if (!trans
->bytes_reserved
)
5396 trace_btrfs_space_reservation(root
->fs_info
, "transaction",
5397 trans
->transid
, trans
->bytes_reserved
, 0);
5398 btrfs_block_rsv_release(root
, trans
->block_rsv
, trans
->bytes_reserved
);
5399 trans
->bytes_reserved
= 0;
5403 * To be called after all the new block groups attached to the transaction
5404 * handle have been created (btrfs_create_pending_block_groups()).
5406 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle
*trans
)
5408 struct btrfs_fs_info
*fs_info
= trans
->root
->fs_info
;
5410 if (!trans
->chunk_bytes_reserved
)
5413 WARN_ON_ONCE(!list_empty(&trans
->new_bgs
));
5415 block_rsv_release_bytes(fs_info
, &fs_info
->chunk_block_rsv
, NULL
,
5416 trans
->chunk_bytes_reserved
);
5417 trans
->chunk_bytes_reserved
= 0;
5420 /* Can only return 0 or -ENOSPC */
5421 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle
*trans
,
5422 struct inode
*inode
)
5424 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5425 struct btrfs_block_rsv
*src_rsv
= get_block_rsv(trans
, root
);
5426 struct btrfs_block_rsv
*dst_rsv
= root
->orphan_block_rsv
;
5429 * We need to hold space in order to delete our orphan item once we've
5430 * added it, so this takes the reservation so we can release it later
5431 * when we are truly done with the orphan item.
5433 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
5434 trace_btrfs_space_reservation(root
->fs_info
, "orphan",
5435 btrfs_ino(inode
), num_bytes
, 1);
5436 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
5439 void btrfs_orphan_release_metadata(struct inode
*inode
)
5441 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5442 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
5443 trace_btrfs_space_reservation(root
->fs_info
, "orphan",
5444 btrfs_ino(inode
), num_bytes
, 0);
5445 btrfs_block_rsv_release(root
, root
->orphan_block_rsv
, num_bytes
);
5449 * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation
5450 * root: the root of the parent directory
5451 * rsv: block reservation
5452 * items: the number of items that we need do reservation
5453 * qgroup_reserved: used to return the reserved size in qgroup
5455 * This function is used to reserve the space for snapshot/subvolume
5456 * creation and deletion. Those operations are different with the
5457 * common file/directory operations, they change two fs/file trees
5458 * and root tree, the number of items that the qgroup reserves is
5459 * different with the free space reservation. So we can not use
5460 * the space reseravtion mechanism in start_transaction().
5462 int btrfs_subvolume_reserve_metadata(struct btrfs_root
*root
,
5463 struct btrfs_block_rsv
*rsv
,
5465 u64
*qgroup_reserved
,
5466 bool use_global_rsv
)
5470 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
5472 if (root
->fs_info
->quota_enabled
) {
5473 /* One for parent inode, two for dir entries */
5474 num_bytes
= 3 * root
->nodesize
;
5475 ret
= btrfs_qgroup_reserve_meta(root
, num_bytes
);
5482 *qgroup_reserved
= num_bytes
;
5484 num_bytes
= btrfs_calc_trans_metadata_size(root
, items
);
5485 rsv
->space_info
= __find_space_info(root
->fs_info
,
5486 BTRFS_BLOCK_GROUP_METADATA
);
5487 ret
= btrfs_block_rsv_add(root
, rsv
, num_bytes
,
5488 BTRFS_RESERVE_FLUSH_ALL
);
5490 if (ret
== -ENOSPC
&& use_global_rsv
)
5491 ret
= btrfs_block_rsv_migrate(global_rsv
, rsv
, num_bytes
);
5493 if (ret
&& *qgroup_reserved
)
5494 btrfs_qgroup_free_meta(root
, *qgroup_reserved
);
5499 void btrfs_subvolume_release_metadata(struct btrfs_root
*root
,
5500 struct btrfs_block_rsv
*rsv
,
5501 u64 qgroup_reserved
)
5503 btrfs_block_rsv_release(root
, rsv
, (u64
)-1);
5507 * drop_outstanding_extent - drop an outstanding extent
5508 * @inode: the inode we're dropping the extent for
5509 * @num_bytes: the number of bytes we're relaseing.
5511 * This is called when we are freeing up an outstanding extent, either called
5512 * after an error or after an extent is written. This will return the number of
5513 * reserved extents that need to be freed. This must be called with
5514 * BTRFS_I(inode)->lock held.
5516 static unsigned drop_outstanding_extent(struct inode
*inode
, u64 num_bytes
)
5518 unsigned drop_inode_space
= 0;
5519 unsigned dropped_extents
= 0;
5520 unsigned num_extents
= 0;
5522 num_extents
= (unsigned)div64_u64(num_bytes
+
5523 BTRFS_MAX_EXTENT_SIZE
- 1,
5524 BTRFS_MAX_EXTENT_SIZE
);
5525 ASSERT(num_extents
);
5526 ASSERT(BTRFS_I(inode
)->outstanding_extents
>= num_extents
);
5527 BTRFS_I(inode
)->outstanding_extents
-= num_extents
;
5529 if (BTRFS_I(inode
)->outstanding_extents
== 0 &&
5530 test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5531 &BTRFS_I(inode
)->runtime_flags
))
5532 drop_inode_space
= 1;
5535 * If we have more or the same amount of outsanding extents than we have
5536 * reserved then we need to leave the reserved extents count alone.
5538 if (BTRFS_I(inode
)->outstanding_extents
>=
5539 BTRFS_I(inode
)->reserved_extents
)
5540 return drop_inode_space
;
5542 dropped_extents
= BTRFS_I(inode
)->reserved_extents
-
5543 BTRFS_I(inode
)->outstanding_extents
;
5544 BTRFS_I(inode
)->reserved_extents
-= dropped_extents
;
5545 return dropped_extents
+ drop_inode_space
;
5549 * calc_csum_metadata_size - return the amount of metada space that must be
5550 * reserved/free'd for the given bytes.
5551 * @inode: the inode we're manipulating
5552 * @num_bytes: the number of bytes in question
5553 * @reserve: 1 if we are reserving space, 0 if we are freeing space
5555 * This adjusts the number of csum_bytes in the inode and then returns the
5556 * correct amount of metadata that must either be reserved or freed. We
5557 * calculate how many checksums we can fit into one leaf and then divide the
5558 * number of bytes that will need to be checksumed by this value to figure out
5559 * how many checksums will be required. If we are adding bytes then the number
5560 * may go up and we will return the number of additional bytes that must be
5561 * reserved. If it is going down we will return the number of bytes that must
5564 * This must be called with BTRFS_I(inode)->lock held.
5566 static u64
calc_csum_metadata_size(struct inode
*inode
, u64 num_bytes
,
5569 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5570 u64 old_csums
, num_csums
;
5572 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
&&
5573 BTRFS_I(inode
)->csum_bytes
== 0)
5576 old_csums
= btrfs_csum_bytes_to_leaves(root
, BTRFS_I(inode
)->csum_bytes
);
5578 BTRFS_I(inode
)->csum_bytes
+= num_bytes
;
5580 BTRFS_I(inode
)->csum_bytes
-= num_bytes
;
5581 num_csums
= btrfs_csum_bytes_to_leaves(root
, BTRFS_I(inode
)->csum_bytes
);
5583 /* No change, no need to reserve more */
5584 if (old_csums
== num_csums
)
5588 return btrfs_calc_trans_metadata_size(root
,
5589 num_csums
- old_csums
);
5591 return btrfs_calc_trans_metadata_size(root
, old_csums
- num_csums
);
5594 int btrfs_delalloc_reserve_metadata(struct inode
*inode
, u64 num_bytes
)
5596 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5597 struct btrfs_block_rsv
*block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
5600 unsigned nr_extents
= 0;
5601 int extra_reserve
= 0;
5602 enum btrfs_reserve_flush_enum flush
= BTRFS_RESERVE_FLUSH_ALL
;
5604 bool delalloc_lock
= true;
5608 /* If we are a free space inode we need to not flush since we will be in
5609 * the middle of a transaction commit. We also don't need the delalloc
5610 * mutex since we won't race with anybody. We need this mostly to make
5611 * lockdep shut its filthy mouth.
5613 if (btrfs_is_free_space_inode(inode
)) {
5614 flush
= BTRFS_RESERVE_NO_FLUSH
;
5615 delalloc_lock
= false;
5618 if (flush
!= BTRFS_RESERVE_NO_FLUSH
&&
5619 btrfs_transaction_in_commit(root
->fs_info
))
5620 schedule_timeout(1);
5623 mutex_lock(&BTRFS_I(inode
)->delalloc_mutex
);
5625 num_bytes
= ALIGN(num_bytes
, root
->sectorsize
);
5627 spin_lock(&BTRFS_I(inode
)->lock
);
5628 nr_extents
= (unsigned)div64_u64(num_bytes
+
5629 BTRFS_MAX_EXTENT_SIZE
- 1,
5630 BTRFS_MAX_EXTENT_SIZE
);
5631 BTRFS_I(inode
)->outstanding_extents
+= nr_extents
;
5634 if (BTRFS_I(inode
)->outstanding_extents
>
5635 BTRFS_I(inode
)->reserved_extents
)
5636 nr_extents
= BTRFS_I(inode
)->outstanding_extents
-
5637 BTRFS_I(inode
)->reserved_extents
;
5640 * Add an item to reserve for updating the inode when we complete the
5643 if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5644 &BTRFS_I(inode
)->runtime_flags
)) {
5649 to_reserve
= btrfs_calc_trans_metadata_size(root
, nr_extents
);
5650 to_reserve
+= calc_csum_metadata_size(inode
, num_bytes
, 1);
5651 csum_bytes
= BTRFS_I(inode
)->csum_bytes
;
5652 spin_unlock(&BTRFS_I(inode
)->lock
);
5654 if (root
->fs_info
->quota_enabled
) {
5655 ret
= btrfs_qgroup_reserve_meta(root
,
5656 nr_extents
* root
->nodesize
);
5661 ret
= reserve_metadata_bytes(root
, block_rsv
, to_reserve
, flush
);
5662 if (unlikely(ret
)) {
5663 btrfs_qgroup_free_meta(root
, nr_extents
* root
->nodesize
);
5667 spin_lock(&BTRFS_I(inode
)->lock
);
5668 if (extra_reserve
) {
5669 set_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5670 &BTRFS_I(inode
)->runtime_flags
);
5673 BTRFS_I(inode
)->reserved_extents
+= nr_extents
;
5674 spin_unlock(&BTRFS_I(inode
)->lock
);
5677 mutex_unlock(&BTRFS_I(inode
)->delalloc_mutex
);
5680 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5681 btrfs_ino(inode
), to_reserve
, 1);
5682 block_rsv_add_bytes(block_rsv
, to_reserve
, 1);
5687 spin_lock(&BTRFS_I(inode
)->lock
);
5688 dropped
= drop_outstanding_extent(inode
, num_bytes
);
5690 * If the inodes csum_bytes is the same as the original
5691 * csum_bytes then we know we haven't raced with any free()ers
5692 * so we can just reduce our inodes csum bytes and carry on.
5694 if (BTRFS_I(inode
)->csum_bytes
== csum_bytes
) {
5695 calc_csum_metadata_size(inode
, num_bytes
, 0);
5697 u64 orig_csum_bytes
= BTRFS_I(inode
)->csum_bytes
;
5701 * This is tricky, but first we need to figure out how much we
5702 * free'd from any free-ers that occured during this
5703 * reservation, so we reset ->csum_bytes to the csum_bytes
5704 * before we dropped our lock, and then call the free for the
5705 * number of bytes that were freed while we were trying our
5708 bytes
= csum_bytes
- BTRFS_I(inode
)->csum_bytes
;
5709 BTRFS_I(inode
)->csum_bytes
= csum_bytes
;
5710 to_free
= calc_csum_metadata_size(inode
, bytes
, 0);
5714 * Now we need to see how much we would have freed had we not
5715 * been making this reservation and our ->csum_bytes were not
5716 * artificially inflated.
5718 BTRFS_I(inode
)->csum_bytes
= csum_bytes
- num_bytes
;
5719 bytes
= csum_bytes
- orig_csum_bytes
;
5720 bytes
= calc_csum_metadata_size(inode
, bytes
, 0);
5723 * Now reset ->csum_bytes to what it should be. If bytes is
5724 * more than to_free then we would have free'd more space had we
5725 * not had an artificially high ->csum_bytes, so we need to free
5726 * the remainder. If bytes is the same or less then we don't
5727 * need to do anything, the other free-ers did the correct
5730 BTRFS_I(inode
)->csum_bytes
= orig_csum_bytes
- num_bytes
;
5731 if (bytes
> to_free
)
5732 to_free
= bytes
- to_free
;
5736 spin_unlock(&BTRFS_I(inode
)->lock
);
5738 to_free
+= btrfs_calc_trans_metadata_size(root
, dropped
);
5741 btrfs_block_rsv_release(root
, block_rsv
, to_free
);
5742 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5743 btrfs_ino(inode
), to_free
, 0);
5746 mutex_unlock(&BTRFS_I(inode
)->delalloc_mutex
);
5751 * btrfs_delalloc_release_metadata - release a metadata reservation for an inode
5752 * @inode: the inode to release the reservation for
5753 * @num_bytes: the number of bytes we're releasing
5755 * This will release the metadata reservation for an inode. This can be called
5756 * once we complete IO for a given set of bytes to release their metadata
5759 void btrfs_delalloc_release_metadata(struct inode
*inode
, u64 num_bytes
)
5761 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5765 num_bytes
= ALIGN(num_bytes
, root
->sectorsize
);
5766 spin_lock(&BTRFS_I(inode
)->lock
);
5767 dropped
= drop_outstanding_extent(inode
, num_bytes
);
5770 to_free
= calc_csum_metadata_size(inode
, num_bytes
, 0);
5771 spin_unlock(&BTRFS_I(inode
)->lock
);
5773 to_free
+= btrfs_calc_trans_metadata_size(root
, dropped
);
5775 if (btrfs_test_is_dummy_root(root
))
5778 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5779 btrfs_ino(inode
), to_free
, 0);
5781 btrfs_block_rsv_release(root
, &root
->fs_info
->delalloc_block_rsv
,
5786 * btrfs_delalloc_reserve_space - reserve data and metadata space for
5788 * @inode: inode we're writing to
5789 * @start: start range we are writing to
5790 * @len: how long the range we are writing to
5792 * TODO: This function will finally replace old btrfs_delalloc_reserve_space()
5794 * This will do the following things
5796 * o reserve space in data space info for num bytes
5797 * and reserve precious corresponding qgroup space
5798 * (Done in check_data_free_space)
5800 * o reserve space for metadata space, based on the number of outstanding
5801 * extents and how much csums will be needed
5802 * also reserve metadata space in a per root over-reserve method.
5803 * o add to the inodes->delalloc_bytes
5804 * o add it to the fs_info's delalloc inodes list.
5805 * (Above 3 all done in delalloc_reserve_metadata)
5807 * Return 0 for success
5808 * Return <0 for error(-ENOSPC or -EQUOT)
5810 int btrfs_delalloc_reserve_space(struct inode
*inode
, u64 start
, u64 len
)
5814 ret
= btrfs_check_data_free_space(inode
, start
, len
);
5817 ret
= btrfs_delalloc_reserve_metadata(inode
, len
);
5819 btrfs_free_reserved_data_space(inode
, start
, len
);
5824 * btrfs_delalloc_release_space - release data and metadata space for delalloc
5825 * @inode: inode we're releasing space for
5826 * @start: start position of the space already reserved
5827 * @len: the len of the space already reserved
5829 * This must be matched with a call to btrfs_delalloc_reserve_space. This is
5830 * called in the case that we don't need the metadata AND data reservations
5831 * anymore. So if there is an error or we insert an inline extent.
5833 * This function will release the metadata space that was not used and will
5834 * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes
5835 * list if there are no delalloc bytes left.
5836 * Also it will handle the qgroup reserved space.
5838 void btrfs_delalloc_release_space(struct inode
*inode
, u64 start
, u64 len
)
5840 btrfs_delalloc_release_metadata(inode
, len
);
5841 btrfs_free_reserved_data_space(inode
, start
, len
);
5844 static int update_block_group(struct btrfs_trans_handle
*trans
,
5845 struct btrfs_root
*root
, u64 bytenr
,
5846 u64 num_bytes
, int alloc
)
5848 struct btrfs_block_group_cache
*cache
= NULL
;
5849 struct btrfs_fs_info
*info
= root
->fs_info
;
5850 u64 total
= num_bytes
;
5855 /* block accounting for super block */
5856 spin_lock(&info
->delalloc_root_lock
);
5857 old_val
= btrfs_super_bytes_used(info
->super_copy
);
5859 old_val
+= num_bytes
;
5861 old_val
-= num_bytes
;
5862 btrfs_set_super_bytes_used(info
->super_copy
, old_val
);
5863 spin_unlock(&info
->delalloc_root_lock
);
5866 cache
= btrfs_lookup_block_group(info
, bytenr
);
5869 if (cache
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
5870 BTRFS_BLOCK_GROUP_RAID1
|
5871 BTRFS_BLOCK_GROUP_RAID10
))
5876 * If this block group has free space cache written out, we
5877 * need to make sure to load it if we are removing space. This
5878 * is because we need the unpinning stage to actually add the
5879 * space back to the block group, otherwise we will leak space.
5881 if (!alloc
&& cache
->cached
== BTRFS_CACHE_NO
)
5882 cache_block_group(cache
, 1);
5884 byte_in_group
= bytenr
- cache
->key
.objectid
;
5885 WARN_ON(byte_in_group
> cache
->key
.offset
);
5887 spin_lock(&cache
->space_info
->lock
);
5888 spin_lock(&cache
->lock
);
5890 if (btrfs_test_opt(root
, SPACE_CACHE
) &&
5891 cache
->disk_cache_state
< BTRFS_DC_CLEAR
)
5892 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
5894 old_val
= btrfs_block_group_used(&cache
->item
);
5895 num_bytes
= min(total
, cache
->key
.offset
- byte_in_group
);
5897 old_val
+= num_bytes
;
5898 btrfs_set_block_group_used(&cache
->item
, old_val
);
5899 cache
->reserved
-= num_bytes
;
5900 cache
->space_info
->bytes_reserved
-= num_bytes
;
5901 cache
->space_info
->bytes_used
+= num_bytes
;
5902 cache
->space_info
->disk_used
+= num_bytes
* factor
;
5903 spin_unlock(&cache
->lock
);
5904 spin_unlock(&cache
->space_info
->lock
);
5906 old_val
-= num_bytes
;
5907 btrfs_set_block_group_used(&cache
->item
, old_val
);
5908 cache
->pinned
+= num_bytes
;
5909 cache
->space_info
->bytes_pinned
+= num_bytes
;
5910 cache
->space_info
->bytes_used
-= num_bytes
;
5911 cache
->space_info
->disk_used
-= num_bytes
* factor
;
5912 spin_unlock(&cache
->lock
);
5913 spin_unlock(&cache
->space_info
->lock
);
5915 set_extent_dirty(info
->pinned_extents
,
5916 bytenr
, bytenr
+ num_bytes
- 1,
5917 GFP_NOFS
| __GFP_NOFAIL
);
5919 * No longer have used bytes in this block group, queue
5923 spin_lock(&info
->unused_bgs_lock
);
5924 if (list_empty(&cache
->bg_list
)) {
5925 btrfs_get_block_group(cache
);
5926 list_add_tail(&cache
->bg_list
,
5929 spin_unlock(&info
->unused_bgs_lock
);
5933 spin_lock(&trans
->transaction
->dirty_bgs_lock
);
5934 if (list_empty(&cache
->dirty_list
)) {
5935 list_add_tail(&cache
->dirty_list
,
5936 &trans
->transaction
->dirty_bgs
);
5937 trans
->transaction
->num_dirty_bgs
++;
5938 btrfs_get_block_group(cache
);
5940 spin_unlock(&trans
->transaction
->dirty_bgs_lock
);
5942 btrfs_put_block_group(cache
);
5944 bytenr
+= num_bytes
;
5949 static u64
first_logical_byte(struct btrfs_root
*root
, u64 search_start
)
5951 struct btrfs_block_group_cache
*cache
;
5954 spin_lock(&root
->fs_info
->block_group_cache_lock
);
5955 bytenr
= root
->fs_info
->first_logical_byte
;
5956 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
5958 if (bytenr
< (u64
)-1)
5961 cache
= btrfs_lookup_first_block_group(root
->fs_info
, search_start
);
5965 bytenr
= cache
->key
.objectid
;
5966 btrfs_put_block_group(cache
);
5971 static int pin_down_extent(struct btrfs_root
*root
,
5972 struct btrfs_block_group_cache
*cache
,
5973 u64 bytenr
, u64 num_bytes
, int reserved
)
5975 spin_lock(&cache
->space_info
->lock
);
5976 spin_lock(&cache
->lock
);
5977 cache
->pinned
+= num_bytes
;
5978 cache
->space_info
->bytes_pinned
+= num_bytes
;
5980 cache
->reserved
-= num_bytes
;
5981 cache
->space_info
->bytes_reserved
-= num_bytes
;
5983 spin_unlock(&cache
->lock
);
5984 spin_unlock(&cache
->space_info
->lock
);
5986 set_extent_dirty(root
->fs_info
->pinned_extents
, bytenr
,
5987 bytenr
+ num_bytes
- 1, GFP_NOFS
| __GFP_NOFAIL
);
5989 trace_btrfs_reserved_extent_free(root
, bytenr
, num_bytes
);
5994 * this function must be called within transaction
5996 int btrfs_pin_extent(struct btrfs_root
*root
,
5997 u64 bytenr
, u64 num_bytes
, int reserved
)
5999 struct btrfs_block_group_cache
*cache
;
6001 cache
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
6002 BUG_ON(!cache
); /* Logic error */
6004 pin_down_extent(root
, cache
, bytenr
, num_bytes
, reserved
);
6006 btrfs_put_block_group(cache
);
6011 * this function must be called within transaction
6013 int btrfs_pin_extent_for_log_replay(struct btrfs_root
*root
,
6014 u64 bytenr
, u64 num_bytes
)
6016 struct btrfs_block_group_cache
*cache
;
6019 cache
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
6024 * pull in the free space cache (if any) so that our pin
6025 * removes the free space from the cache. We have load_only set
6026 * to one because the slow code to read in the free extents does check
6027 * the pinned extents.
6029 cache_block_group(cache
, 1);
6031 pin_down_extent(root
, cache
, bytenr
, num_bytes
, 0);
6033 /* remove us from the free space cache (if we're there at all) */
6034 ret
= btrfs_remove_free_space(cache
, bytenr
, num_bytes
);
6035 btrfs_put_block_group(cache
);
6039 static int __exclude_logged_extent(struct btrfs_root
*root
, u64 start
, u64 num_bytes
)
6042 struct btrfs_block_group_cache
*block_group
;
6043 struct btrfs_caching_control
*caching_ctl
;
6045 block_group
= btrfs_lookup_block_group(root
->fs_info
, start
);
6049 cache_block_group(block_group
, 0);
6050 caching_ctl
= get_caching_control(block_group
);
6054 BUG_ON(!block_group_cache_done(block_group
));
6055 ret
= btrfs_remove_free_space(block_group
, start
, num_bytes
);
6057 mutex_lock(&caching_ctl
->mutex
);
6059 if (start
>= caching_ctl
->progress
) {
6060 ret
= add_excluded_extent(root
, start
, num_bytes
);
6061 } else if (start
+ num_bytes
<= caching_ctl
->progress
) {
6062 ret
= btrfs_remove_free_space(block_group
,
6065 num_bytes
= caching_ctl
->progress
- start
;
6066 ret
= btrfs_remove_free_space(block_group
,
6071 num_bytes
= (start
+ num_bytes
) -
6072 caching_ctl
->progress
;
6073 start
= caching_ctl
->progress
;
6074 ret
= add_excluded_extent(root
, start
, num_bytes
);
6077 mutex_unlock(&caching_ctl
->mutex
);
6078 put_caching_control(caching_ctl
);
6080 btrfs_put_block_group(block_group
);
6084 int btrfs_exclude_logged_extents(struct btrfs_root
*log
,
6085 struct extent_buffer
*eb
)
6087 struct btrfs_file_extent_item
*item
;
6088 struct btrfs_key key
;
6092 if (!btrfs_fs_incompat(log
->fs_info
, MIXED_GROUPS
))
6095 for (i
= 0; i
< btrfs_header_nritems(eb
); i
++) {
6096 btrfs_item_key_to_cpu(eb
, &key
, i
);
6097 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
6099 item
= btrfs_item_ptr(eb
, i
, struct btrfs_file_extent_item
);
6100 found_type
= btrfs_file_extent_type(eb
, item
);
6101 if (found_type
== BTRFS_FILE_EXTENT_INLINE
)
6103 if (btrfs_file_extent_disk_bytenr(eb
, item
) == 0)
6105 key
.objectid
= btrfs_file_extent_disk_bytenr(eb
, item
);
6106 key
.offset
= btrfs_file_extent_disk_num_bytes(eb
, item
);
6107 __exclude_logged_extent(log
, key
.objectid
, key
.offset
);
6114 * btrfs_update_reserved_bytes - update the block_group and space info counters
6115 * @cache: The cache we are manipulating
6116 * @num_bytes: The number of bytes in question
6117 * @reserve: One of the reservation enums
6118 * @delalloc: The blocks are allocated for the delalloc write
6120 * This is called by the allocator when it reserves space, or by somebody who is
6121 * freeing space that was never actually used on disk. For example if you
6122 * reserve some space for a new leaf in transaction A and before transaction A
6123 * commits you free that leaf, you call this with reserve set to 0 in order to
6124 * clear the reservation.
6126 * Metadata reservations should be called with RESERVE_ALLOC so we do the proper
6127 * ENOSPC accounting. For data we handle the reservation through clearing the
6128 * delalloc bits in the io_tree. We have to do this since we could end up
6129 * allocating less disk space for the amount of data we have reserved in the
6130 * case of compression.
6132 * If this is a reservation and the block group has become read only we cannot
6133 * make the reservation and return -EAGAIN, otherwise this function always
6136 static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache
*cache
,
6137 u64 num_bytes
, int reserve
, int delalloc
)
6139 struct btrfs_space_info
*space_info
= cache
->space_info
;
6142 spin_lock(&space_info
->lock
);
6143 spin_lock(&cache
->lock
);
6144 if (reserve
!= RESERVE_FREE
) {
6148 cache
->reserved
+= num_bytes
;
6149 space_info
->bytes_reserved
+= num_bytes
;
6150 if (reserve
== RESERVE_ALLOC
) {
6151 trace_btrfs_space_reservation(cache
->fs_info
,
6152 "space_info", space_info
->flags
,
6154 space_info
->bytes_may_use
-= num_bytes
;
6158 cache
->delalloc_bytes
+= num_bytes
;
6162 space_info
->bytes_readonly
+= num_bytes
;
6163 cache
->reserved
-= num_bytes
;
6164 space_info
->bytes_reserved
-= num_bytes
;
6167 cache
->delalloc_bytes
-= num_bytes
;
6169 spin_unlock(&cache
->lock
);
6170 spin_unlock(&space_info
->lock
);
6174 void btrfs_prepare_extent_commit(struct btrfs_trans_handle
*trans
,
6175 struct btrfs_root
*root
)
6177 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
6178 struct btrfs_caching_control
*next
;
6179 struct btrfs_caching_control
*caching_ctl
;
6180 struct btrfs_block_group_cache
*cache
;
6182 down_write(&fs_info
->commit_root_sem
);
6184 list_for_each_entry_safe(caching_ctl
, next
,
6185 &fs_info
->caching_block_groups
, list
) {
6186 cache
= caching_ctl
->block_group
;
6187 if (block_group_cache_done(cache
)) {
6188 cache
->last_byte_to_unpin
= (u64
)-1;
6189 list_del_init(&caching_ctl
->list
);
6190 put_caching_control(caching_ctl
);
6192 cache
->last_byte_to_unpin
= caching_ctl
->progress
;
6196 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
6197 fs_info
->pinned_extents
= &fs_info
->freed_extents
[1];
6199 fs_info
->pinned_extents
= &fs_info
->freed_extents
[0];
6201 up_write(&fs_info
->commit_root_sem
);
6203 update_global_block_rsv(fs_info
);
6207 * Returns the free cluster for the given space info and sets empty_cluster to
6208 * what it should be based on the mount options.
6210 static struct btrfs_free_cluster
*
6211 fetch_cluster_info(struct btrfs_root
*root
, struct btrfs_space_info
*space_info
,
6214 struct btrfs_free_cluster
*ret
= NULL
;
6215 bool ssd
= btrfs_test_opt(root
, SSD
);
6218 if (btrfs_mixed_space_info(space_info
))
6222 *empty_cluster
= 2 * 1024 * 1024;
6223 if (space_info
->flags
& BTRFS_BLOCK_GROUP_METADATA
) {
6224 ret
= &root
->fs_info
->meta_alloc_cluster
;
6226 *empty_cluster
= 64 * 1024;
6227 } else if ((space_info
->flags
& BTRFS_BLOCK_GROUP_DATA
) && ssd
) {
6228 ret
= &root
->fs_info
->data_alloc_cluster
;
6234 static int unpin_extent_range(struct btrfs_root
*root
, u64 start
, u64 end
,
6235 const bool return_free_space
)
6237 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
6238 struct btrfs_block_group_cache
*cache
= NULL
;
6239 struct btrfs_space_info
*space_info
;
6240 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
6241 struct btrfs_free_cluster
*cluster
= NULL
;
6243 u64 total_unpinned
= 0;
6244 u64 empty_cluster
= 0;
6247 while (start
<= end
) {
6250 start
>= cache
->key
.objectid
+ cache
->key
.offset
) {
6252 btrfs_put_block_group(cache
);
6254 cache
= btrfs_lookup_block_group(fs_info
, start
);
6255 BUG_ON(!cache
); /* Logic error */
6257 cluster
= fetch_cluster_info(root
,
6260 empty_cluster
<<= 1;
6263 len
= cache
->key
.objectid
+ cache
->key
.offset
- start
;
6264 len
= min(len
, end
+ 1 - start
);
6266 if (start
< cache
->last_byte_to_unpin
) {
6267 len
= min(len
, cache
->last_byte_to_unpin
- start
);
6268 if (return_free_space
)
6269 btrfs_add_free_space(cache
, start
, len
);
6273 total_unpinned
+= len
;
6274 space_info
= cache
->space_info
;
6277 * If this space cluster has been marked as fragmented and we've
6278 * unpinned enough in this block group to potentially allow a
6279 * cluster to be created inside of it go ahead and clear the
6282 if (cluster
&& cluster
->fragmented
&&
6283 total_unpinned
> empty_cluster
) {
6284 spin_lock(&cluster
->lock
);
6285 cluster
->fragmented
= 0;
6286 spin_unlock(&cluster
->lock
);
6289 spin_lock(&space_info
->lock
);
6290 spin_lock(&cache
->lock
);
6291 cache
->pinned
-= len
;
6292 space_info
->bytes_pinned
-= len
;
6293 space_info
->max_extent_size
= 0;
6294 percpu_counter_add(&space_info
->total_bytes_pinned
, -len
);
6296 space_info
->bytes_readonly
+= len
;
6299 spin_unlock(&cache
->lock
);
6300 if (!readonly
&& global_rsv
->space_info
== space_info
) {
6301 spin_lock(&global_rsv
->lock
);
6302 if (!global_rsv
->full
) {
6303 len
= min(len
, global_rsv
->size
-
6304 global_rsv
->reserved
);
6305 global_rsv
->reserved
+= len
;
6306 space_info
->bytes_may_use
+= len
;
6307 if (global_rsv
->reserved
>= global_rsv
->size
)
6308 global_rsv
->full
= 1;
6310 spin_unlock(&global_rsv
->lock
);
6312 spin_unlock(&space_info
->lock
);
6316 btrfs_put_block_group(cache
);
6320 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
6321 struct btrfs_root
*root
)
6323 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
6324 struct btrfs_block_group_cache
*block_group
, *tmp
;
6325 struct list_head
*deleted_bgs
;
6326 struct extent_io_tree
*unpin
;
6331 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
6332 unpin
= &fs_info
->freed_extents
[1];
6334 unpin
= &fs_info
->freed_extents
[0];
6336 while (!trans
->aborted
) {
6337 mutex_lock(&fs_info
->unused_bg_unpin_mutex
);
6338 ret
= find_first_extent_bit(unpin
, 0, &start
, &end
,
6339 EXTENT_DIRTY
, NULL
);
6341 mutex_unlock(&fs_info
->unused_bg_unpin_mutex
);
6345 if (btrfs_test_opt(root
, DISCARD
))
6346 ret
= btrfs_discard_extent(root
, start
,
6347 end
+ 1 - start
, NULL
);
6349 clear_extent_dirty(unpin
, start
, end
, GFP_NOFS
);
6350 unpin_extent_range(root
, start
, end
, true);
6351 mutex_unlock(&fs_info
->unused_bg_unpin_mutex
);
6356 * Transaction is finished. We don't need the lock anymore. We
6357 * do need to clean up the block groups in case of a transaction
6360 deleted_bgs
= &trans
->transaction
->deleted_bgs
;
6361 list_for_each_entry_safe(block_group
, tmp
, deleted_bgs
, bg_list
) {
6365 if (!trans
->aborted
)
6366 ret
= btrfs_discard_extent(root
,
6367 block_group
->key
.objectid
,
6368 block_group
->key
.offset
,
6371 list_del_init(&block_group
->bg_list
);
6372 btrfs_put_block_group_trimming(block_group
);
6373 btrfs_put_block_group(block_group
);
6376 const char *errstr
= btrfs_decode_error(ret
);
6378 "Discard failed while removing blockgroup: errno=%d %s\n",
6386 static void add_pinned_bytes(struct btrfs_fs_info
*fs_info
, u64 num_bytes
,
6387 u64 owner
, u64 root_objectid
)
6389 struct btrfs_space_info
*space_info
;
6392 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
6393 if (root_objectid
== BTRFS_CHUNK_TREE_OBJECTID
)
6394 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
6396 flags
= BTRFS_BLOCK_GROUP_METADATA
;
6398 flags
= BTRFS_BLOCK_GROUP_DATA
;
6401 space_info
= __find_space_info(fs_info
, flags
);
6402 BUG_ON(!space_info
); /* Logic bug */
6403 percpu_counter_add(&space_info
->total_bytes_pinned
, num_bytes
);
6407 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
6408 struct btrfs_root
*root
,
6409 struct btrfs_delayed_ref_node
*node
, u64 parent
,
6410 u64 root_objectid
, u64 owner_objectid
,
6411 u64 owner_offset
, int refs_to_drop
,
6412 struct btrfs_delayed_extent_op
*extent_op
)
6414 struct btrfs_key key
;
6415 struct btrfs_path
*path
;
6416 struct btrfs_fs_info
*info
= root
->fs_info
;
6417 struct btrfs_root
*extent_root
= info
->extent_root
;
6418 struct extent_buffer
*leaf
;
6419 struct btrfs_extent_item
*ei
;
6420 struct btrfs_extent_inline_ref
*iref
;
6423 int extent_slot
= 0;
6424 int found_extent
= 0;
6428 u64 bytenr
= node
->bytenr
;
6429 u64 num_bytes
= node
->num_bytes
;
6431 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
6434 path
= btrfs_alloc_path();
6439 path
->leave_spinning
= 1;
6441 is_data
= owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
;
6442 BUG_ON(!is_data
&& refs_to_drop
!= 1);
6445 skinny_metadata
= 0;
6447 ret
= lookup_extent_backref(trans
, extent_root
, path
, &iref
,
6448 bytenr
, num_bytes
, parent
,
6449 root_objectid
, owner_objectid
,
6452 extent_slot
= path
->slots
[0];
6453 while (extent_slot
>= 0) {
6454 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
6456 if (key
.objectid
!= bytenr
)
6458 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
6459 key
.offset
== num_bytes
) {
6463 if (key
.type
== BTRFS_METADATA_ITEM_KEY
&&
6464 key
.offset
== owner_objectid
) {
6468 if (path
->slots
[0] - extent_slot
> 5)
6472 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
6473 item_size
= btrfs_item_size_nr(path
->nodes
[0], extent_slot
);
6474 if (found_extent
&& item_size
< sizeof(*ei
))
6477 if (!found_extent
) {
6479 ret
= remove_extent_backref(trans
, extent_root
, path
,
6481 is_data
, &last_ref
);
6483 btrfs_abort_transaction(trans
, extent_root
, ret
);
6486 btrfs_release_path(path
);
6487 path
->leave_spinning
= 1;
6489 key
.objectid
= bytenr
;
6490 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
6491 key
.offset
= num_bytes
;
6493 if (!is_data
&& skinny_metadata
) {
6494 key
.type
= BTRFS_METADATA_ITEM_KEY
;
6495 key
.offset
= owner_objectid
;
6498 ret
= btrfs_search_slot(trans
, extent_root
,
6500 if (ret
> 0 && skinny_metadata
&& path
->slots
[0]) {
6502 * Couldn't find our skinny metadata item,
6503 * see if we have ye olde extent item.
6506 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
6508 if (key
.objectid
== bytenr
&&
6509 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
6510 key
.offset
== num_bytes
)
6514 if (ret
> 0 && skinny_metadata
) {
6515 skinny_metadata
= false;
6516 key
.objectid
= bytenr
;
6517 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
6518 key
.offset
= num_bytes
;
6519 btrfs_release_path(path
);
6520 ret
= btrfs_search_slot(trans
, extent_root
,
6525 btrfs_err(info
, "umm, got %d back from search, was looking for %llu",
6528 btrfs_print_leaf(extent_root
,
6532 btrfs_abort_transaction(trans
, extent_root
, ret
);
6535 extent_slot
= path
->slots
[0];
6537 } else if (WARN_ON(ret
== -ENOENT
)) {
6538 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
6540 "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu",
6541 bytenr
, parent
, root_objectid
, owner_objectid
,
6543 btrfs_abort_transaction(trans
, extent_root
, ret
);
6546 btrfs_abort_transaction(trans
, extent_root
, ret
);
6550 leaf
= path
->nodes
[0];
6551 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
6552 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
6553 if (item_size
< sizeof(*ei
)) {
6554 BUG_ON(found_extent
|| extent_slot
!= path
->slots
[0]);
6555 ret
= convert_extent_item_v0(trans
, extent_root
, path
,
6558 btrfs_abort_transaction(trans
, extent_root
, ret
);
6562 btrfs_release_path(path
);
6563 path
->leave_spinning
= 1;
6565 key
.objectid
= bytenr
;
6566 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
6567 key
.offset
= num_bytes
;
6569 ret
= btrfs_search_slot(trans
, extent_root
, &key
, path
,
6572 btrfs_err(info
, "umm, got %d back from search, was looking for %llu",
6574 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
6577 btrfs_abort_transaction(trans
, extent_root
, ret
);
6581 extent_slot
= path
->slots
[0];
6582 leaf
= path
->nodes
[0];
6583 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
6586 BUG_ON(item_size
< sizeof(*ei
));
6587 ei
= btrfs_item_ptr(leaf
, extent_slot
,
6588 struct btrfs_extent_item
);
6589 if (owner_objectid
< BTRFS_FIRST_FREE_OBJECTID
&&
6590 key
.type
== BTRFS_EXTENT_ITEM_KEY
) {
6591 struct btrfs_tree_block_info
*bi
;
6592 BUG_ON(item_size
< sizeof(*ei
) + sizeof(*bi
));
6593 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
6594 WARN_ON(owner_objectid
!= btrfs_tree_block_level(leaf
, bi
));
6597 refs
= btrfs_extent_refs(leaf
, ei
);
6598 if (refs
< refs_to_drop
) {
6599 btrfs_err(info
, "trying to drop %d refs but we only have %Lu "
6600 "for bytenr %Lu", refs_to_drop
, refs
, bytenr
);
6602 btrfs_abort_transaction(trans
, extent_root
, ret
);
6605 refs
-= refs_to_drop
;
6609 __run_delayed_extent_op(extent_op
, leaf
, ei
);
6611 * In the case of inline back ref, reference count will
6612 * be updated by remove_extent_backref
6615 BUG_ON(!found_extent
);
6617 btrfs_set_extent_refs(leaf
, ei
, refs
);
6618 btrfs_mark_buffer_dirty(leaf
);
6621 ret
= remove_extent_backref(trans
, extent_root
, path
,
6623 is_data
, &last_ref
);
6625 btrfs_abort_transaction(trans
, extent_root
, ret
);
6629 add_pinned_bytes(root
->fs_info
, -num_bytes
, owner_objectid
,
6633 BUG_ON(is_data
&& refs_to_drop
!=
6634 extent_data_ref_count(path
, iref
));
6636 BUG_ON(path
->slots
[0] != extent_slot
);
6638 BUG_ON(path
->slots
[0] != extent_slot
+ 1);
6639 path
->slots
[0] = extent_slot
;
6645 ret
= btrfs_del_items(trans
, extent_root
, path
, path
->slots
[0],
6648 btrfs_abort_transaction(trans
, extent_root
, ret
);
6651 btrfs_release_path(path
);
6654 ret
= btrfs_del_csums(trans
, root
, bytenr
, num_bytes
);
6656 btrfs_abort_transaction(trans
, extent_root
, ret
);
6661 ret
= update_block_group(trans
, root
, bytenr
, num_bytes
, 0);
6663 btrfs_abort_transaction(trans
, extent_root
, ret
);
6667 btrfs_release_path(path
);
6670 btrfs_free_path(path
);
6675 * when we free an block, it is possible (and likely) that we free the last
6676 * delayed ref for that extent as well. This searches the delayed ref tree for
6677 * a given extent, and if there are no other delayed refs to be processed, it
6678 * removes it from the tree.
6680 static noinline
int check_ref_cleanup(struct btrfs_trans_handle
*trans
,
6681 struct btrfs_root
*root
, u64 bytenr
)
6683 struct btrfs_delayed_ref_head
*head
;
6684 struct btrfs_delayed_ref_root
*delayed_refs
;
6687 delayed_refs
= &trans
->transaction
->delayed_refs
;
6688 spin_lock(&delayed_refs
->lock
);
6689 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
6691 goto out_delayed_unlock
;
6693 spin_lock(&head
->lock
);
6694 if (!list_empty(&head
->ref_list
))
6697 if (head
->extent_op
) {
6698 if (!head
->must_insert_reserved
)
6700 btrfs_free_delayed_extent_op(head
->extent_op
);
6701 head
->extent_op
= NULL
;
6705 * waiting for the lock here would deadlock. If someone else has it
6706 * locked they are already in the process of dropping it anyway
6708 if (!mutex_trylock(&head
->mutex
))
6712 * at this point we have a head with no other entries. Go
6713 * ahead and process it.
6715 head
->node
.in_tree
= 0;
6716 rb_erase(&head
->href_node
, &delayed_refs
->href_root
);
6718 atomic_dec(&delayed_refs
->num_entries
);
6721 * we don't take a ref on the node because we're removing it from the
6722 * tree, so we just steal the ref the tree was holding.
6724 delayed_refs
->num_heads
--;
6725 if (head
->processing
== 0)
6726 delayed_refs
->num_heads_ready
--;
6727 head
->processing
= 0;
6728 spin_unlock(&head
->lock
);
6729 spin_unlock(&delayed_refs
->lock
);
6731 BUG_ON(head
->extent_op
);
6732 if (head
->must_insert_reserved
)
6735 mutex_unlock(&head
->mutex
);
6736 btrfs_put_delayed_ref(&head
->node
);
6739 spin_unlock(&head
->lock
);
6742 spin_unlock(&delayed_refs
->lock
);
6746 void btrfs_free_tree_block(struct btrfs_trans_handle
*trans
,
6747 struct btrfs_root
*root
,
6748 struct extent_buffer
*buf
,
6749 u64 parent
, int last_ref
)
6754 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
6755 ret
= btrfs_add_delayed_tree_ref(root
->fs_info
, trans
,
6756 buf
->start
, buf
->len
,
6757 parent
, root
->root_key
.objectid
,
6758 btrfs_header_level(buf
),
6759 BTRFS_DROP_DELAYED_REF
, NULL
);
6760 BUG_ON(ret
); /* -ENOMEM */
6766 if (btrfs_header_generation(buf
) == trans
->transid
) {
6767 struct btrfs_block_group_cache
*cache
;
6769 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
6770 ret
= check_ref_cleanup(trans
, root
, buf
->start
);
6775 cache
= btrfs_lookup_block_group(root
->fs_info
, buf
->start
);
6777 if (btrfs_header_flag(buf
, BTRFS_HEADER_FLAG_WRITTEN
)) {
6778 pin_down_extent(root
, cache
, buf
->start
, buf
->len
, 1);
6779 btrfs_put_block_group(cache
);
6783 WARN_ON(test_bit(EXTENT_BUFFER_DIRTY
, &buf
->bflags
));
6785 btrfs_add_free_space(cache
, buf
->start
, buf
->len
);
6786 btrfs_update_reserved_bytes(cache
, buf
->len
, RESERVE_FREE
, 0);
6787 btrfs_put_block_group(cache
);
6788 trace_btrfs_reserved_extent_free(root
, buf
->start
, buf
->len
);
6793 add_pinned_bytes(root
->fs_info
, buf
->len
,
6794 btrfs_header_level(buf
),
6795 root
->root_key
.objectid
);
6798 * Deleting the buffer, clear the corrupt flag since it doesn't matter
6801 clear_bit(EXTENT_BUFFER_CORRUPT
, &buf
->bflags
);
6804 /* Can return -ENOMEM */
6805 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
6806 u64 bytenr
, u64 num_bytes
, u64 parent
, u64 root_objectid
,
6807 u64 owner
, u64 offset
)
6810 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
6812 if (btrfs_test_is_dummy_root(root
))
6815 add_pinned_bytes(root
->fs_info
, num_bytes
, owner
, root_objectid
);
6818 * tree log blocks never actually go into the extent allocation
6819 * tree, just update pinning info and exit early.
6821 if (root_objectid
== BTRFS_TREE_LOG_OBJECTID
) {
6822 WARN_ON(owner
>= BTRFS_FIRST_FREE_OBJECTID
);
6823 /* unlocks the pinned mutex */
6824 btrfs_pin_extent(root
, bytenr
, num_bytes
, 1);
6826 } else if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
6827 ret
= btrfs_add_delayed_tree_ref(fs_info
, trans
, bytenr
,
6829 parent
, root_objectid
, (int)owner
,
6830 BTRFS_DROP_DELAYED_REF
, NULL
);
6832 ret
= btrfs_add_delayed_data_ref(fs_info
, trans
, bytenr
,
6834 parent
, root_objectid
, owner
,
6836 BTRFS_DROP_DELAYED_REF
, NULL
);
6842 * when we wait for progress in the block group caching, its because
6843 * our allocation attempt failed at least once. So, we must sleep
6844 * and let some progress happen before we try again.
6846 * This function will sleep at least once waiting for new free space to
6847 * show up, and then it will check the block group free space numbers
6848 * for our min num_bytes. Another option is to have it go ahead
6849 * and look in the rbtree for a free extent of a given size, but this
6852 * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using
6853 * any of the information in this block group.
6855 static noinline
void
6856 wait_block_group_cache_progress(struct btrfs_block_group_cache
*cache
,
6859 struct btrfs_caching_control
*caching_ctl
;
6861 caching_ctl
= get_caching_control(cache
);
6865 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
) ||
6866 (cache
->free_space_ctl
->free_space
>= num_bytes
));
6868 put_caching_control(caching_ctl
);
6872 wait_block_group_cache_done(struct btrfs_block_group_cache
*cache
)
6874 struct btrfs_caching_control
*caching_ctl
;
6877 caching_ctl
= get_caching_control(cache
);
6879 return (cache
->cached
== BTRFS_CACHE_ERROR
) ? -EIO
: 0;
6881 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
));
6882 if (cache
->cached
== BTRFS_CACHE_ERROR
)
6884 put_caching_control(caching_ctl
);
6888 int __get_raid_index(u64 flags
)
6890 if (flags
& BTRFS_BLOCK_GROUP_RAID10
)
6891 return BTRFS_RAID_RAID10
;
6892 else if (flags
& BTRFS_BLOCK_GROUP_RAID1
)
6893 return BTRFS_RAID_RAID1
;
6894 else if (flags
& BTRFS_BLOCK_GROUP_DUP
)
6895 return BTRFS_RAID_DUP
;
6896 else if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
6897 return BTRFS_RAID_RAID0
;
6898 else if (flags
& BTRFS_BLOCK_GROUP_RAID5
)
6899 return BTRFS_RAID_RAID5
;
6900 else if (flags
& BTRFS_BLOCK_GROUP_RAID6
)
6901 return BTRFS_RAID_RAID6
;
6903 return BTRFS_RAID_SINGLE
; /* BTRFS_BLOCK_GROUP_SINGLE */
6906 int get_block_group_index(struct btrfs_block_group_cache
*cache
)
6908 return __get_raid_index(cache
->flags
);
6911 static const char *btrfs_raid_type_names
[BTRFS_NR_RAID_TYPES
] = {
6912 [BTRFS_RAID_RAID10
] = "raid10",
6913 [BTRFS_RAID_RAID1
] = "raid1",
6914 [BTRFS_RAID_DUP
] = "dup",
6915 [BTRFS_RAID_RAID0
] = "raid0",
6916 [BTRFS_RAID_SINGLE
] = "single",
6917 [BTRFS_RAID_RAID5
] = "raid5",
6918 [BTRFS_RAID_RAID6
] = "raid6",
6921 static const char *get_raid_name(enum btrfs_raid_types type
)
6923 if (type
>= BTRFS_NR_RAID_TYPES
)
6926 return btrfs_raid_type_names
[type
];
6929 enum btrfs_loop_type
{
6930 LOOP_CACHING_NOWAIT
= 0,
6931 LOOP_CACHING_WAIT
= 1,
6932 LOOP_ALLOC_CHUNK
= 2,
6933 LOOP_NO_EMPTY_SIZE
= 3,
6937 btrfs_lock_block_group(struct btrfs_block_group_cache
*cache
,
6941 down_read(&cache
->data_rwsem
);
6945 btrfs_grab_block_group(struct btrfs_block_group_cache
*cache
,
6948 btrfs_get_block_group(cache
);
6950 down_read(&cache
->data_rwsem
);
6953 static struct btrfs_block_group_cache
*
6954 btrfs_lock_cluster(struct btrfs_block_group_cache
*block_group
,
6955 struct btrfs_free_cluster
*cluster
,
6958 struct btrfs_block_group_cache
*used_bg
;
6959 bool locked
= false;
6961 spin_lock(&cluster
->refill_lock
);
6963 if (used_bg
== cluster
->block_group
)
6966 up_read(&used_bg
->data_rwsem
);
6967 btrfs_put_block_group(used_bg
);
6970 used_bg
= cluster
->block_group
;
6974 if (used_bg
== block_group
)
6977 btrfs_get_block_group(used_bg
);
6982 if (down_read_trylock(&used_bg
->data_rwsem
))
6985 spin_unlock(&cluster
->refill_lock
);
6986 down_read(&used_bg
->data_rwsem
);
6992 btrfs_release_block_group(struct btrfs_block_group_cache
*cache
,
6996 up_read(&cache
->data_rwsem
);
6997 btrfs_put_block_group(cache
);
7001 * walks the btree of allocated extents and find a hole of a given size.
7002 * The key ins is changed to record the hole:
7003 * ins->objectid == start position
7004 * ins->flags = BTRFS_EXTENT_ITEM_KEY
7005 * ins->offset == the size of the hole.
7006 * Any available blocks before search_start are skipped.
7008 * If there is no suitable free space, we will record the max size of
7009 * the free space extent currently.
7011 static noinline
int find_free_extent(struct btrfs_root
*orig_root
,
7012 u64 num_bytes
, u64 empty_size
,
7013 u64 hint_byte
, struct btrfs_key
*ins
,
7014 u64 flags
, int delalloc
)
7017 struct btrfs_root
*root
= orig_root
->fs_info
->extent_root
;
7018 struct btrfs_free_cluster
*last_ptr
= NULL
;
7019 struct btrfs_block_group_cache
*block_group
= NULL
;
7020 u64 search_start
= 0;
7021 u64 max_extent_size
= 0;
7022 u64 empty_cluster
= 0;
7023 struct btrfs_space_info
*space_info
;
7025 int index
= __get_raid_index(flags
);
7026 int alloc_type
= (flags
& BTRFS_BLOCK_GROUP_DATA
) ?
7027 RESERVE_ALLOC_NO_ACCOUNT
: RESERVE_ALLOC
;
7028 bool failed_cluster_refill
= false;
7029 bool failed_alloc
= false;
7030 bool use_cluster
= true;
7031 bool have_caching_bg
= false;
7032 bool orig_have_caching_bg
= false;
7033 bool full_search
= false;
7035 WARN_ON(num_bytes
< root
->sectorsize
);
7036 ins
->type
= BTRFS_EXTENT_ITEM_KEY
;
7040 trace_find_free_extent(orig_root
, num_bytes
, empty_size
, flags
);
7042 space_info
= __find_space_info(root
->fs_info
, flags
);
7044 btrfs_err(root
->fs_info
, "No space info for %llu", flags
);
7049 * If our free space is heavily fragmented we may not be able to make
7050 * big contiguous allocations, so instead of doing the expensive search
7051 * for free space, simply return ENOSPC with our max_extent_size so we
7052 * can go ahead and search for a more manageable chunk.
7054 * If our max_extent_size is large enough for our allocation simply
7055 * disable clustering since we will likely not be able to find enough
7056 * space to create a cluster and induce latency trying.
7058 if (unlikely(space_info
->max_extent_size
)) {
7059 spin_lock(&space_info
->lock
);
7060 if (space_info
->max_extent_size
&&
7061 num_bytes
> space_info
->max_extent_size
) {
7062 ins
->offset
= space_info
->max_extent_size
;
7063 spin_unlock(&space_info
->lock
);
7065 } else if (space_info
->max_extent_size
) {
7066 use_cluster
= false;
7068 spin_unlock(&space_info
->lock
);
7071 last_ptr
= fetch_cluster_info(orig_root
, space_info
, &empty_cluster
);
7073 spin_lock(&last_ptr
->lock
);
7074 if (last_ptr
->block_group
)
7075 hint_byte
= last_ptr
->window_start
;
7076 if (last_ptr
->fragmented
) {
7078 * We still set window_start so we can keep track of the
7079 * last place we found an allocation to try and save
7082 hint_byte
= last_ptr
->window_start
;
7083 use_cluster
= false;
7085 spin_unlock(&last_ptr
->lock
);
7088 search_start
= max(search_start
, first_logical_byte(root
, 0));
7089 search_start
= max(search_start
, hint_byte
);
7090 if (search_start
== hint_byte
) {
7091 block_group
= btrfs_lookup_block_group(root
->fs_info
,
7094 * we don't want to use the block group if it doesn't match our
7095 * allocation bits, or if its not cached.
7097 * However if we are re-searching with an ideal block group
7098 * picked out then we don't care that the block group is cached.
7100 if (block_group
&& block_group_bits(block_group
, flags
) &&
7101 block_group
->cached
!= BTRFS_CACHE_NO
) {
7102 down_read(&space_info
->groups_sem
);
7103 if (list_empty(&block_group
->list
) ||
7106 * someone is removing this block group,
7107 * we can't jump into the have_block_group
7108 * target because our list pointers are not
7111 btrfs_put_block_group(block_group
);
7112 up_read(&space_info
->groups_sem
);
7114 index
= get_block_group_index(block_group
);
7115 btrfs_lock_block_group(block_group
, delalloc
);
7116 goto have_block_group
;
7118 } else if (block_group
) {
7119 btrfs_put_block_group(block_group
);
7123 have_caching_bg
= false;
7124 if (index
== 0 || index
== __get_raid_index(flags
))
7126 down_read(&space_info
->groups_sem
);
7127 list_for_each_entry(block_group
, &space_info
->block_groups
[index
],
7132 btrfs_grab_block_group(block_group
, delalloc
);
7133 search_start
= block_group
->key
.objectid
;
7136 * this can happen if we end up cycling through all the
7137 * raid types, but we want to make sure we only allocate
7138 * for the proper type.
7140 if (!block_group_bits(block_group
, flags
)) {
7141 u64 extra
= BTRFS_BLOCK_GROUP_DUP
|
7142 BTRFS_BLOCK_GROUP_RAID1
|
7143 BTRFS_BLOCK_GROUP_RAID5
|
7144 BTRFS_BLOCK_GROUP_RAID6
|
7145 BTRFS_BLOCK_GROUP_RAID10
;
7148 * if they asked for extra copies and this block group
7149 * doesn't provide them, bail. This does allow us to
7150 * fill raid0 from raid1.
7152 if ((flags
& extra
) && !(block_group
->flags
& extra
))
7157 cached
= block_group_cache_done(block_group
);
7158 if (unlikely(!cached
)) {
7159 have_caching_bg
= true;
7160 ret
= cache_block_group(block_group
, 0);
7165 if (unlikely(block_group
->cached
== BTRFS_CACHE_ERROR
))
7167 if (unlikely(block_group
->ro
))
7171 * Ok we want to try and use the cluster allocator, so
7174 if (last_ptr
&& use_cluster
) {
7175 struct btrfs_block_group_cache
*used_block_group
;
7176 unsigned long aligned_cluster
;
7178 * the refill lock keeps out other
7179 * people trying to start a new cluster
7181 used_block_group
= btrfs_lock_cluster(block_group
,
7184 if (!used_block_group
)
7185 goto refill_cluster
;
7187 if (used_block_group
!= block_group
&&
7188 (used_block_group
->ro
||
7189 !block_group_bits(used_block_group
, flags
)))
7190 goto release_cluster
;
7192 offset
= btrfs_alloc_from_cluster(used_block_group
,
7195 used_block_group
->key
.objectid
,
7198 /* we have a block, we're done */
7199 spin_unlock(&last_ptr
->refill_lock
);
7200 trace_btrfs_reserve_extent_cluster(root
,
7202 search_start
, num_bytes
);
7203 if (used_block_group
!= block_group
) {
7204 btrfs_release_block_group(block_group
,
7206 block_group
= used_block_group
;
7211 WARN_ON(last_ptr
->block_group
!= used_block_group
);
7213 /* If we are on LOOP_NO_EMPTY_SIZE, we can't
7214 * set up a new clusters, so lets just skip it
7215 * and let the allocator find whatever block
7216 * it can find. If we reach this point, we
7217 * will have tried the cluster allocator
7218 * plenty of times and not have found
7219 * anything, so we are likely way too
7220 * fragmented for the clustering stuff to find
7223 * However, if the cluster is taken from the
7224 * current block group, release the cluster
7225 * first, so that we stand a better chance of
7226 * succeeding in the unclustered
7228 if (loop
>= LOOP_NO_EMPTY_SIZE
&&
7229 used_block_group
!= block_group
) {
7230 spin_unlock(&last_ptr
->refill_lock
);
7231 btrfs_release_block_group(used_block_group
,
7233 goto unclustered_alloc
;
7237 * this cluster didn't work out, free it and
7240 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
7242 if (used_block_group
!= block_group
)
7243 btrfs_release_block_group(used_block_group
,
7246 if (loop
>= LOOP_NO_EMPTY_SIZE
) {
7247 spin_unlock(&last_ptr
->refill_lock
);
7248 goto unclustered_alloc
;
7251 aligned_cluster
= max_t(unsigned long,
7252 empty_cluster
+ empty_size
,
7253 block_group
->full_stripe_len
);
7255 /* allocate a cluster in this block group */
7256 ret
= btrfs_find_space_cluster(root
, block_group
,
7257 last_ptr
, search_start
,
7262 * now pull our allocation out of this
7265 offset
= btrfs_alloc_from_cluster(block_group
,
7271 /* we found one, proceed */
7272 spin_unlock(&last_ptr
->refill_lock
);
7273 trace_btrfs_reserve_extent_cluster(root
,
7274 block_group
, search_start
,
7278 } else if (!cached
&& loop
> LOOP_CACHING_NOWAIT
7279 && !failed_cluster_refill
) {
7280 spin_unlock(&last_ptr
->refill_lock
);
7282 failed_cluster_refill
= true;
7283 wait_block_group_cache_progress(block_group
,
7284 num_bytes
+ empty_cluster
+ empty_size
);
7285 goto have_block_group
;
7289 * at this point we either didn't find a cluster
7290 * or we weren't able to allocate a block from our
7291 * cluster. Free the cluster we've been trying
7292 * to use, and go to the next block group
7294 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
7295 spin_unlock(&last_ptr
->refill_lock
);
7301 * We are doing an unclustered alloc, set the fragmented flag so
7302 * we don't bother trying to setup a cluster again until we get
7305 if (unlikely(last_ptr
)) {
7306 spin_lock(&last_ptr
->lock
);
7307 last_ptr
->fragmented
= 1;
7308 spin_unlock(&last_ptr
->lock
);
7310 spin_lock(&block_group
->free_space_ctl
->tree_lock
);
7312 block_group
->free_space_ctl
->free_space
<
7313 num_bytes
+ empty_cluster
+ empty_size
) {
7314 if (block_group
->free_space_ctl
->free_space
>
7317 block_group
->free_space_ctl
->free_space
;
7318 spin_unlock(&block_group
->free_space_ctl
->tree_lock
);
7321 spin_unlock(&block_group
->free_space_ctl
->tree_lock
);
7323 offset
= btrfs_find_space_for_alloc(block_group
, search_start
,
7324 num_bytes
, empty_size
,
7327 * If we didn't find a chunk, and we haven't failed on this
7328 * block group before, and this block group is in the middle of
7329 * caching and we are ok with waiting, then go ahead and wait
7330 * for progress to be made, and set failed_alloc to true.
7332 * If failed_alloc is true then we've already waited on this
7333 * block group once and should move on to the next block group.
7335 if (!offset
&& !failed_alloc
&& !cached
&&
7336 loop
> LOOP_CACHING_NOWAIT
) {
7337 wait_block_group_cache_progress(block_group
,
7338 num_bytes
+ empty_size
);
7339 failed_alloc
= true;
7340 goto have_block_group
;
7341 } else if (!offset
) {
7345 search_start
= ALIGN(offset
, root
->stripesize
);
7347 /* move on to the next group */
7348 if (search_start
+ num_bytes
>
7349 block_group
->key
.objectid
+ block_group
->key
.offset
) {
7350 btrfs_add_free_space(block_group
, offset
, num_bytes
);
7354 if (offset
< search_start
)
7355 btrfs_add_free_space(block_group
, offset
,
7356 search_start
- offset
);
7357 BUG_ON(offset
> search_start
);
7359 ret
= btrfs_update_reserved_bytes(block_group
, num_bytes
,
7360 alloc_type
, delalloc
);
7361 if (ret
== -EAGAIN
) {
7362 btrfs_add_free_space(block_group
, offset
, num_bytes
);
7366 /* we are all good, lets return */
7367 ins
->objectid
= search_start
;
7368 ins
->offset
= num_bytes
;
7370 trace_btrfs_reserve_extent(orig_root
, block_group
,
7371 search_start
, num_bytes
);
7372 btrfs_release_block_group(block_group
, delalloc
);
7375 failed_cluster_refill
= false;
7376 failed_alloc
= false;
7377 BUG_ON(index
!= get_block_group_index(block_group
));
7378 btrfs_release_block_group(block_group
, delalloc
);
7380 up_read(&space_info
->groups_sem
);
7382 if ((loop
== LOOP_CACHING_NOWAIT
) && have_caching_bg
7383 && !orig_have_caching_bg
)
7384 orig_have_caching_bg
= true;
7386 if (!ins
->objectid
&& loop
>= LOOP_CACHING_WAIT
&& have_caching_bg
)
7389 if (!ins
->objectid
&& ++index
< BTRFS_NR_RAID_TYPES
)
7393 * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking
7394 * caching kthreads as we move along
7395 * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching
7396 * LOOP_ALLOC_CHUNK, force a chunk allocation and try again
7397 * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
7400 if (!ins
->objectid
&& loop
< LOOP_NO_EMPTY_SIZE
) {
7402 if (loop
== LOOP_CACHING_NOWAIT
) {
7404 * We want to skip the LOOP_CACHING_WAIT step if we
7405 * don't have any unached bgs and we've alrelady done a
7406 * full search through.
7408 if (orig_have_caching_bg
|| !full_search
)
7409 loop
= LOOP_CACHING_WAIT
;
7411 loop
= LOOP_ALLOC_CHUNK
;
7416 if (loop
== LOOP_ALLOC_CHUNK
) {
7417 struct btrfs_trans_handle
*trans
;
7420 trans
= current
->journal_info
;
7424 trans
= btrfs_join_transaction(root
);
7426 if (IS_ERR(trans
)) {
7427 ret
= PTR_ERR(trans
);
7431 ret
= do_chunk_alloc(trans
, root
, flags
,
7435 * If we can't allocate a new chunk we've already looped
7436 * through at least once, move on to the NO_EMPTY_SIZE
7440 loop
= LOOP_NO_EMPTY_SIZE
;
7443 * Do not bail out on ENOSPC since we
7444 * can do more things.
7446 if (ret
< 0 && ret
!= -ENOSPC
)
7447 btrfs_abort_transaction(trans
,
7452 btrfs_end_transaction(trans
, root
);
7457 if (loop
== LOOP_NO_EMPTY_SIZE
) {
7459 * Don't loop again if we already have no empty_size and
7462 if (empty_size
== 0 &&
7463 empty_cluster
== 0) {
7472 } else if (!ins
->objectid
) {
7474 } else if (ins
->objectid
) {
7475 if (!use_cluster
&& last_ptr
) {
7476 spin_lock(&last_ptr
->lock
);
7477 last_ptr
->window_start
= ins
->objectid
;
7478 spin_unlock(&last_ptr
->lock
);
7483 if (ret
== -ENOSPC
) {
7484 spin_lock(&space_info
->lock
);
7485 space_info
->max_extent_size
= max_extent_size
;
7486 spin_unlock(&space_info
->lock
);
7487 ins
->offset
= max_extent_size
;
7492 static void dump_space_info(struct btrfs_space_info
*info
, u64 bytes
,
7493 int dump_block_groups
)
7495 struct btrfs_block_group_cache
*cache
;
7498 spin_lock(&info
->lock
);
7499 printk(KERN_INFO
"BTRFS: space_info %llu has %llu free, is %sfull\n",
7501 info
->total_bytes
- info
->bytes_used
- info
->bytes_pinned
-
7502 info
->bytes_reserved
- info
->bytes_readonly
,
7503 (info
->full
) ? "" : "not ");
7504 printk(KERN_INFO
"BTRFS: space_info total=%llu, used=%llu, pinned=%llu, "
7505 "reserved=%llu, may_use=%llu, readonly=%llu\n",
7506 info
->total_bytes
, info
->bytes_used
, info
->bytes_pinned
,
7507 info
->bytes_reserved
, info
->bytes_may_use
,
7508 info
->bytes_readonly
);
7509 spin_unlock(&info
->lock
);
7511 if (!dump_block_groups
)
7514 down_read(&info
->groups_sem
);
7516 list_for_each_entry(cache
, &info
->block_groups
[index
], list
) {
7517 spin_lock(&cache
->lock
);
7518 printk(KERN_INFO
"BTRFS: "
7519 "block group %llu has %llu bytes, "
7520 "%llu used %llu pinned %llu reserved %s\n",
7521 cache
->key
.objectid
, cache
->key
.offset
,
7522 btrfs_block_group_used(&cache
->item
), cache
->pinned
,
7523 cache
->reserved
, cache
->ro
? "[readonly]" : "");
7524 btrfs_dump_free_space(cache
, bytes
);
7525 spin_unlock(&cache
->lock
);
7527 if (++index
< BTRFS_NR_RAID_TYPES
)
7529 up_read(&info
->groups_sem
);
7532 int btrfs_reserve_extent(struct btrfs_root
*root
,
7533 u64 num_bytes
, u64 min_alloc_size
,
7534 u64 empty_size
, u64 hint_byte
,
7535 struct btrfs_key
*ins
, int is_data
, int delalloc
)
7537 bool final_tried
= num_bytes
== min_alloc_size
;
7541 flags
= btrfs_get_alloc_profile(root
, is_data
);
7543 WARN_ON(num_bytes
< root
->sectorsize
);
7544 ret
= find_free_extent(root
, num_bytes
, empty_size
, hint_byte
, ins
,
7547 if (ret
== -ENOSPC
) {
7548 if (!final_tried
&& ins
->offset
) {
7549 num_bytes
= min(num_bytes
>> 1, ins
->offset
);
7550 num_bytes
= round_down(num_bytes
, root
->sectorsize
);
7551 num_bytes
= max(num_bytes
, min_alloc_size
);
7552 if (num_bytes
== min_alloc_size
)
7555 } else if (btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
7556 struct btrfs_space_info
*sinfo
;
7558 sinfo
= __find_space_info(root
->fs_info
, flags
);
7559 btrfs_err(root
->fs_info
, "allocation failed flags %llu, wanted %llu",
7562 dump_space_info(sinfo
, num_bytes
, 1);
7569 static int __btrfs_free_reserved_extent(struct btrfs_root
*root
,
7571 int pin
, int delalloc
)
7573 struct btrfs_block_group_cache
*cache
;
7576 cache
= btrfs_lookup_block_group(root
->fs_info
, start
);
7578 btrfs_err(root
->fs_info
, "Unable to find block group for %llu",
7584 pin_down_extent(root
, cache
, start
, len
, 1);
7586 if (btrfs_test_opt(root
, DISCARD
))
7587 ret
= btrfs_discard_extent(root
, start
, len
, NULL
);
7588 btrfs_add_free_space(cache
, start
, len
);
7589 btrfs_update_reserved_bytes(cache
, len
, RESERVE_FREE
, delalloc
);
7592 btrfs_put_block_group(cache
);
7594 trace_btrfs_reserved_extent_free(root
, start
, len
);
7599 int btrfs_free_reserved_extent(struct btrfs_root
*root
,
7600 u64 start
, u64 len
, int delalloc
)
7602 return __btrfs_free_reserved_extent(root
, start
, len
, 0, delalloc
);
7605 int btrfs_free_and_pin_reserved_extent(struct btrfs_root
*root
,
7608 return __btrfs_free_reserved_extent(root
, start
, len
, 1, 0);
7611 static int alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
7612 struct btrfs_root
*root
,
7613 u64 parent
, u64 root_objectid
,
7614 u64 flags
, u64 owner
, u64 offset
,
7615 struct btrfs_key
*ins
, int ref_mod
)
7618 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
7619 struct btrfs_extent_item
*extent_item
;
7620 struct btrfs_extent_inline_ref
*iref
;
7621 struct btrfs_path
*path
;
7622 struct extent_buffer
*leaf
;
7627 type
= BTRFS_SHARED_DATA_REF_KEY
;
7629 type
= BTRFS_EXTENT_DATA_REF_KEY
;
7631 size
= sizeof(*extent_item
) + btrfs_extent_inline_ref_size(type
);
7633 path
= btrfs_alloc_path();
7637 path
->leave_spinning
= 1;
7638 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
7641 btrfs_free_path(path
);
7645 leaf
= path
->nodes
[0];
7646 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
7647 struct btrfs_extent_item
);
7648 btrfs_set_extent_refs(leaf
, extent_item
, ref_mod
);
7649 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
7650 btrfs_set_extent_flags(leaf
, extent_item
,
7651 flags
| BTRFS_EXTENT_FLAG_DATA
);
7653 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
7654 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
7656 struct btrfs_shared_data_ref
*ref
;
7657 ref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
7658 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
7659 btrfs_set_shared_data_ref_count(leaf
, ref
, ref_mod
);
7661 struct btrfs_extent_data_ref
*ref
;
7662 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
7663 btrfs_set_extent_data_ref_root(leaf
, ref
, root_objectid
);
7664 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
7665 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
7666 btrfs_set_extent_data_ref_count(leaf
, ref
, ref_mod
);
7669 btrfs_mark_buffer_dirty(path
->nodes
[0]);
7670 btrfs_free_path(path
);
7672 ret
= update_block_group(trans
, root
, ins
->objectid
, ins
->offset
, 1);
7673 if (ret
) { /* -ENOENT, logic error */
7674 btrfs_err(fs_info
, "update block group failed for %llu %llu",
7675 ins
->objectid
, ins
->offset
);
7678 trace_btrfs_reserved_extent_alloc(root
, ins
->objectid
, ins
->offset
);
7682 static int alloc_reserved_tree_block(struct btrfs_trans_handle
*trans
,
7683 struct btrfs_root
*root
,
7684 u64 parent
, u64 root_objectid
,
7685 u64 flags
, struct btrfs_disk_key
*key
,
7686 int level
, struct btrfs_key
*ins
)
7689 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
7690 struct btrfs_extent_item
*extent_item
;
7691 struct btrfs_tree_block_info
*block_info
;
7692 struct btrfs_extent_inline_ref
*iref
;
7693 struct btrfs_path
*path
;
7694 struct extent_buffer
*leaf
;
7695 u32 size
= sizeof(*extent_item
) + sizeof(*iref
);
7696 u64 num_bytes
= ins
->offset
;
7697 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
7700 if (!skinny_metadata
)
7701 size
+= sizeof(*block_info
);
7703 path
= btrfs_alloc_path();
7705 btrfs_free_and_pin_reserved_extent(root
, ins
->objectid
,
7710 path
->leave_spinning
= 1;
7711 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
7714 btrfs_free_path(path
);
7715 btrfs_free_and_pin_reserved_extent(root
, ins
->objectid
,
7720 leaf
= path
->nodes
[0];
7721 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
7722 struct btrfs_extent_item
);
7723 btrfs_set_extent_refs(leaf
, extent_item
, 1);
7724 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
7725 btrfs_set_extent_flags(leaf
, extent_item
,
7726 flags
| BTRFS_EXTENT_FLAG_TREE_BLOCK
);
7728 if (skinny_metadata
) {
7729 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
7730 num_bytes
= root
->nodesize
;
7732 block_info
= (struct btrfs_tree_block_info
*)(extent_item
+ 1);
7733 btrfs_set_tree_block_key(leaf
, block_info
, key
);
7734 btrfs_set_tree_block_level(leaf
, block_info
, level
);
7735 iref
= (struct btrfs_extent_inline_ref
*)(block_info
+ 1);
7739 BUG_ON(!(flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
));
7740 btrfs_set_extent_inline_ref_type(leaf
, iref
,
7741 BTRFS_SHARED_BLOCK_REF_KEY
);
7742 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
7744 btrfs_set_extent_inline_ref_type(leaf
, iref
,
7745 BTRFS_TREE_BLOCK_REF_KEY
);
7746 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
7749 btrfs_mark_buffer_dirty(leaf
);
7750 btrfs_free_path(path
);
7752 ret
= update_block_group(trans
, root
, ins
->objectid
, root
->nodesize
,
7754 if (ret
) { /* -ENOENT, logic error */
7755 btrfs_err(fs_info
, "update block group failed for %llu %llu",
7756 ins
->objectid
, ins
->offset
);
7760 trace_btrfs_reserved_extent_alloc(root
, ins
->objectid
, root
->nodesize
);
7764 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
7765 struct btrfs_root
*root
,
7766 u64 root_objectid
, u64 owner
,
7767 u64 offset
, u64 ram_bytes
,
7768 struct btrfs_key
*ins
)
7772 BUG_ON(root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
7774 ret
= btrfs_add_delayed_data_ref(root
->fs_info
, trans
, ins
->objectid
,
7776 root_objectid
, owner
, offset
,
7777 ram_bytes
, BTRFS_ADD_DELAYED_EXTENT
,
7783 * this is used by the tree logging recovery code. It records that
7784 * an extent has been allocated and makes sure to clear the free
7785 * space cache bits as well
7787 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle
*trans
,
7788 struct btrfs_root
*root
,
7789 u64 root_objectid
, u64 owner
, u64 offset
,
7790 struct btrfs_key
*ins
)
7793 struct btrfs_block_group_cache
*block_group
;
7796 * Mixed block groups will exclude before processing the log so we only
7797 * need to do the exlude dance if this fs isn't mixed.
7799 if (!btrfs_fs_incompat(root
->fs_info
, MIXED_GROUPS
)) {
7800 ret
= __exclude_logged_extent(root
, ins
->objectid
, ins
->offset
);
7805 block_group
= btrfs_lookup_block_group(root
->fs_info
, ins
->objectid
);
7809 ret
= btrfs_update_reserved_bytes(block_group
, ins
->offset
,
7810 RESERVE_ALLOC_NO_ACCOUNT
, 0);
7811 BUG_ON(ret
); /* logic error */
7812 ret
= alloc_reserved_file_extent(trans
, root
, 0, root_objectid
,
7813 0, owner
, offset
, ins
, 1);
7814 btrfs_put_block_group(block_group
);
7818 static struct extent_buffer
*
7819 btrfs_init_new_buffer(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
7820 u64 bytenr
, int level
)
7822 struct extent_buffer
*buf
;
7824 buf
= btrfs_find_create_tree_block(root
, bytenr
);
7826 return ERR_PTR(-ENOMEM
);
7827 btrfs_set_header_generation(buf
, trans
->transid
);
7828 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, buf
, level
);
7829 btrfs_tree_lock(buf
);
7830 clean_tree_block(trans
, root
->fs_info
, buf
);
7831 clear_bit(EXTENT_BUFFER_STALE
, &buf
->bflags
);
7833 btrfs_set_lock_blocking(buf
);
7834 btrfs_set_buffer_uptodate(buf
);
7836 if (root
->root_key
.objectid
== BTRFS_TREE_LOG_OBJECTID
) {
7837 buf
->log_index
= root
->log_transid
% 2;
7839 * we allow two log transactions at a time, use different
7840 * EXENT bit to differentiate dirty pages.
7842 if (buf
->log_index
== 0)
7843 set_extent_dirty(&root
->dirty_log_pages
, buf
->start
,
7844 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7846 set_extent_new(&root
->dirty_log_pages
, buf
->start
,
7847 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7849 buf
->log_index
= -1;
7850 set_extent_dirty(&trans
->transaction
->dirty_pages
, buf
->start
,
7851 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7853 trans
->blocks_used
++;
7854 /* this returns a buffer locked for blocking */
7858 static struct btrfs_block_rsv
*
7859 use_block_rsv(struct btrfs_trans_handle
*trans
,
7860 struct btrfs_root
*root
, u32 blocksize
)
7862 struct btrfs_block_rsv
*block_rsv
;
7863 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
7865 bool global_updated
= false;
7867 block_rsv
= get_block_rsv(trans
, root
);
7869 if (unlikely(block_rsv
->size
== 0))
7872 ret
= block_rsv_use_bytes(block_rsv
, blocksize
);
7876 if (block_rsv
->failfast
)
7877 return ERR_PTR(ret
);
7879 if (block_rsv
->type
== BTRFS_BLOCK_RSV_GLOBAL
&& !global_updated
) {
7880 global_updated
= true;
7881 update_global_block_rsv(root
->fs_info
);
7885 if (btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
7886 static DEFINE_RATELIMIT_STATE(_rs
,
7887 DEFAULT_RATELIMIT_INTERVAL
* 10,
7888 /*DEFAULT_RATELIMIT_BURST*/ 1);
7889 if (__ratelimit(&_rs
))
7891 "BTRFS: block rsv returned %d\n", ret
);
7894 ret
= reserve_metadata_bytes(root
, block_rsv
, blocksize
,
7895 BTRFS_RESERVE_NO_FLUSH
);
7899 * If we couldn't reserve metadata bytes try and use some from
7900 * the global reserve if its space type is the same as the global
7903 if (block_rsv
->type
!= BTRFS_BLOCK_RSV_GLOBAL
&&
7904 block_rsv
->space_info
== global_rsv
->space_info
) {
7905 ret
= block_rsv_use_bytes(global_rsv
, blocksize
);
7909 return ERR_PTR(ret
);
7912 static void unuse_block_rsv(struct btrfs_fs_info
*fs_info
,
7913 struct btrfs_block_rsv
*block_rsv
, u32 blocksize
)
7915 block_rsv_add_bytes(block_rsv
, blocksize
, 0);
7916 block_rsv_release_bytes(fs_info
, block_rsv
, NULL
, 0);
7920 * finds a free extent and does all the dirty work required for allocation
7921 * returns the tree buffer or an ERR_PTR on error.
7923 struct extent_buffer
*btrfs_alloc_tree_block(struct btrfs_trans_handle
*trans
,
7924 struct btrfs_root
*root
,
7925 u64 parent
, u64 root_objectid
,
7926 struct btrfs_disk_key
*key
, int level
,
7927 u64 hint
, u64 empty_size
)
7929 struct btrfs_key ins
;
7930 struct btrfs_block_rsv
*block_rsv
;
7931 struct extent_buffer
*buf
;
7932 struct btrfs_delayed_extent_op
*extent_op
;
7935 u32 blocksize
= root
->nodesize
;
7936 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
7939 if (btrfs_test_is_dummy_root(root
)) {
7940 buf
= btrfs_init_new_buffer(trans
, root
, root
->alloc_bytenr
,
7943 root
->alloc_bytenr
+= blocksize
;
7947 block_rsv
= use_block_rsv(trans
, root
, blocksize
);
7948 if (IS_ERR(block_rsv
))
7949 return ERR_CAST(block_rsv
);
7951 ret
= btrfs_reserve_extent(root
, blocksize
, blocksize
,
7952 empty_size
, hint
, &ins
, 0, 0);
7956 buf
= btrfs_init_new_buffer(trans
, root
, ins
.objectid
, level
);
7959 goto out_free_reserved
;
7962 if (root_objectid
== BTRFS_TREE_RELOC_OBJECTID
) {
7964 parent
= ins
.objectid
;
7965 flags
|= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
7969 if (root_objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
7970 extent_op
= btrfs_alloc_delayed_extent_op();
7976 memcpy(&extent_op
->key
, key
, sizeof(extent_op
->key
));
7978 memset(&extent_op
->key
, 0, sizeof(extent_op
->key
));
7979 extent_op
->flags_to_set
= flags
;
7980 if (skinny_metadata
)
7981 extent_op
->update_key
= 0;
7983 extent_op
->update_key
= 1;
7984 extent_op
->update_flags
= 1;
7985 extent_op
->is_data
= 0;
7986 extent_op
->level
= level
;
7988 ret
= btrfs_add_delayed_tree_ref(root
->fs_info
, trans
,
7989 ins
.objectid
, ins
.offset
,
7990 parent
, root_objectid
, level
,
7991 BTRFS_ADD_DELAYED_EXTENT
,
7994 goto out_free_delayed
;
7999 btrfs_free_delayed_extent_op(extent_op
);
8001 free_extent_buffer(buf
);
8003 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
, 0);
8005 unuse_block_rsv(root
->fs_info
, block_rsv
, blocksize
);
8006 return ERR_PTR(ret
);
8009 struct walk_control
{
8010 u64 refs
[BTRFS_MAX_LEVEL
];
8011 u64 flags
[BTRFS_MAX_LEVEL
];
8012 struct btrfs_key update_progress
;
8023 #define DROP_REFERENCE 1
8024 #define UPDATE_BACKREF 2
8026 static noinline
void reada_walk_down(struct btrfs_trans_handle
*trans
,
8027 struct btrfs_root
*root
,
8028 struct walk_control
*wc
,
8029 struct btrfs_path
*path
)
8037 struct btrfs_key key
;
8038 struct extent_buffer
*eb
;
8043 if (path
->slots
[wc
->level
] < wc
->reada_slot
) {
8044 wc
->reada_count
= wc
->reada_count
* 2 / 3;
8045 wc
->reada_count
= max(wc
->reada_count
, 2);
8047 wc
->reada_count
= wc
->reada_count
* 3 / 2;
8048 wc
->reada_count
= min_t(int, wc
->reada_count
,
8049 BTRFS_NODEPTRS_PER_BLOCK(root
));
8052 eb
= path
->nodes
[wc
->level
];
8053 nritems
= btrfs_header_nritems(eb
);
8054 blocksize
= root
->nodesize
;
8056 for (slot
= path
->slots
[wc
->level
]; slot
< nritems
; slot
++) {
8057 if (nread
>= wc
->reada_count
)
8061 bytenr
= btrfs_node_blockptr(eb
, slot
);
8062 generation
= btrfs_node_ptr_generation(eb
, slot
);
8064 if (slot
== path
->slots
[wc
->level
])
8067 if (wc
->stage
== UPDATE_BACKREF
&&
8068 generation
<= root
->root_key
.offset
)
8071 /* We don't lock the tree block, it's OK to be racy here */
8072 ret
= btrfs_lookup_extent_info(trans
, root
, bytenr
,
8073 wc
->level
- 1, 1, &refs
,
8075 /* We don't care about errors in readahead. */
8080 if (wc
->stage
== DROP_REFERENCE
) {
8084 if (wc
->level
== 1 &&
8085 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
8087 if (!wc
->update_ref
||
8088 generation
<= root
->root_key
.offset
)
8090 btrfs_node_key_to_cpu(eb
, &key
, slot
);
8091 ret
= btrfs_comp_cpu_keys(&key
,
8092 &wc
->update_progress
);
8096 if (wc
->level
== 1 &&
8097 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
8101 readahead_tree_block(root
, bytenr
);
8104 wc
->reada_slot
= slot
;
8108 * TODO: Modify related function to add related node/leaf to dirty_extent_root,
8109 * for later qgroup accounting.
8111 * Current, this function does nothing.
8113 static int account_leaf_items(struct btrfs_trans_handle
*trans
,
8114 struct btrfs_root
*root
,
8115 struct extent_buffer
*eb
)
8117 int nr
= btrfs_header_nritems(eb
);
8119 struct btrfs_key key
;
8120 struct btrfs_file_extent_item
*fi
;
8121 u64 bytenr
, num_bytes
;
8123 for (i
= 0; i
< nr
; i
++) {
8124 btrfs_item_key_to_cpu(eb
, &key
, i
);
8126 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
8129 fi
= btrfs_item_ptr(eb
, i
, struct btrfs_file_extent_item
);
8130 /* filter out non qgroup-accountable extents */
8131 extent_type
= btrfs_file_extent_type(eb
, fi
);
8133 if (extent_type
== BTRFS_FILE_EXTENT_INLINE
)
8136 bytenr
= btrfs_file_extent_disk_bytenr(eb
, fi
);
8140 num_bytes
= btrfs_file_extent_disk_num_bytes(eb
, fi
);
8146 * Walk up the tree from the bottom, freeing leaves and any interior
8147 * nodes which have had all slots visited. If a node (leaf or
8148 * interior) is freed, the node above it will have it's slot
8149 * incremented. The root node will never be freed.
8151 * At the end of this function, we should have a path which has all
8152 * slots incremented to the next position for a search. If we need to
8153 * read a new node it will be NULL and the node above it will have the
8154 * correct slot selected for a later read.
8156 * If we increment the root nodes slot counter past the number of
8157 * elements, 1 is returned to signal completion of the search.
8159 static int adjust_slots_upwards(struct btrfs_root
*root
,
8160 struct btrfs_path
*path
, int root_level
)
8164 struct extent_buffer
*eb
;
8166 if (root_level
== 0)
8169 while (level
<= root_level
) {
8170 eb
= path
->nodes
[level
];
8171 nr
= btrfs_header_nritems(eb
);
8172 path
->slots
[level
]++;
8173 slot
= path
->slots
[level
];
8174 if (slot
>= nr
|| level
== 0) {
8176 * Don't free the root - we will detect this
8177 * condition after our loop and return a
8178 * positive value for caller to stop walking the tree.
8180 if (level
!= root_level
) {
8181 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
8182 path
->locks
[level
] = 0;
8184 free_extent_buffer(eb
);
8185 path
->nodes
[level
] = NULL
;
8186 path
->slots
[level
] = 0;
8190 * We have a valid slot to walk back down
8191 * from. Stop here so caller can process these
8200 eb
= path
->nodes
[root_level
];
8201 if (path
->slots
[root_level
] >= btrfs_header_nritems(eb
))
8208 * root_eb is the subtree root and is locked before this function is called.
8209 * TODO: Modify this function to mark all (including complete shared node)
8210 * to dirty_extent_root to allow it get accounted in qgroup.
8212 static int account_shared_subtree(struct btrfs_trans_handle
*trans
,
8213 struct btrfs_root
*root
,
8214 struct extent_buffer
*root_eb
,
8220 struct extent_buffer
*eb
= root_eb
;
8221 struct btrfs_path
*path
= NULL
;
8223 BUG_ON(root_level
< 0 || root_level
> BTRFS_MAX_LEVEL
);
8224 BUG_ON(root_eb
== NULL
);
8226 if (!root
->fs_info
->quota_enabled
)
8229 if (!extent_buffer_uptodate(root_eb
)) {
8230 ret
= btrfs_read_buffer(root_eb
, root_gen
);
8235 if (root_level
== 0) {
8236 ret
= account_leaf_items(trans
, root
, root_eb
);
8240 path
= btrfs_alloc_path();
8245 * Walk down the tree. Missing extent blocks are filled in as
8246 * we go. Metadata is accounted every time we read a new
8249 * When we reach a leaf, we account for file extent items in it,
8250 * walk back up the tree (adjusting slot pointers as we go)
8251 * and restart the search process.
8253 extent_buffer_get(root_eb
); /* For path */
8254 path
->nodes
[root_level
] = root_eb
;
8255 path
->slots
[root_level
] = 0;
8256 path
->locks
[root_level
] = 0; /* so release_path doesn't try to unlock */
8259 while (level
>= 0) {
8260 if (path
->nodes
[level
] == NULL
) {
8265 /* We need to get child blockptr/gen from
8266 * parent before we can read it. */
8267 eb
= path
->nodes
[level
+ 1];
8268 parent_slot
= path
->slots
[level
+ 1];
8269 child_bytenr
= btrfs_node_blockptr(eb
, parent_slot
);
8270 child_gen
= btrfs_node_ptr_generation(eb
, parent_slot
);
8272 eb
= read_tree_block(root
, child_bytenr
, child_gen
);
8276 } else if (!extent_buffer_uptodate(eb
)) {
8277 free_extent_buffer(eb
);
8282 path
->nodes
[level
] = eb
;
8283 path
->slots
[level
] = 0;
8285 btrfs_tree_read_lock(eb
);
8286 btrfs_set_lock_blocking_rw(eb
, BTRFS_READ_LOCK
);
8287 path
->locks
[level
] = BTRFS_READ_LOCK_BLOCKING
;
8291 ret
= account_leaf_items(trans
, root
, path
->nodes
[level
]);
8295 /* Nonzero return here means we completed our search */
8296 ret
= adjust_slots_upwards(root
, path
, root_level
);
8300 /* Restart search with new slots */
8309 btrfs_free_path(path
);
8315 * helper to process tree block while walking down the tree.
8317 * when wc->stage == UPDATE_BACKREF, this function updates
8318 * back refs for pointers in the block.
8320 * NOTE: return value 1 means we should stop walking down.
8322 static noinline
int walk_down_proc(struct btrfs_trans_handle
*trans
,
8323 struct btrfs_root
*root
,
8324 struct btrfs_path
*path
,
8325 struct walk_control
*wc
, int lookup_info
)
8327 int level
= wc
->level
;
8328 struct extent_buffer
*eb
= path
->nodes
[level
];
8329 u64 flag
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
8332 if (wc
->stage
== UPDATE_BACKREF
&&
8333 btrfs_header_owner(eb
) != root
->root_key
.objectid
)
8337 * when reference count of tree block is 1, it won't increase
8338 * again. once full backref flag is set, we never clear it.
8341 ((wc
->stage
== DROP_REFERENCE
&& wc
->refs
[level
] != 1) ||
8342 (wc
->stage
== UPDATE_BACKREF
&& !(wc
->flags
[level
] & flag
)))) {
8343 BUG_ON(!path
->locks
[level
]);
8344 ret
= btrfs_lookup_extent_info(trans
, root
,
8345 eb
->start
, level
, 1,
8348 BUG_ON(ret
== -ENOMEM
);
8351 BUG_ON(wc
->refs
[level
] == 0);
8354 if (wc
->stage
== DROP_REFERENCE
) {
8355 if (wc
->refs
[level
] > 1)
8358 if (path
->locks
[level
] && !wc
->keep_locks
) {
8359 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
8360 path
->locks
[level
] = 0;
8365 /* wc->stage == UPDATE_BACKREF */
8366 if (!(wc
->flags
[level
] & flag
)) {
8367 BUG_ON(!path
->locks
[level
]);
8368 ret
= btrfs_inc_ref(trans
, root
, eb
, 1);
8369 BUG_ON(ret
); /* -ENOMEM */
8370 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
8371 BUG_ON(ret
); /* -ENOMEM */
8372 ret
= btrfs_set_disk_extent_flags(trans
, root
, eb
->start
,
8374 btrfs_header_level(eb
), 0);
8375 BUG_ON(ret
); /* -ENOMEM */
8376 wc
->flags
[level
] |= flag
;
8380 * the block is shared by multiple trees, so it's not good to
8381 * keep the tree lock
8383 if (path
->locks
[level
] && level
> 0) {
8384 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
8385 path
->locks
[level
] = 0;
8391 * helper to process tree block pointer.
8393 * when wc->stage == DROP_REFERENCE, this function checks
8394 * reference count of the block pointed to. if the block
8395 * is shared and we need update back refs for the subtree
8396 * rooted at the block, this function changes wc->stage to
8397 * UPDATE_BACKREF. if the block is shared and there is no
8398 * need to update back, this function drops the reference
8401 * NOTE: return value 1 means we should stop walking down.
8403 static noinline
int do_walk_down(struct btrfs_trans_handle
*trans
,
8404 struct btrfs_root
*root
,
8405 struct btrfs_path
*path
,
8406 struct walk_control
*wc
, int *lookup_info
)
8412 struct btrfs_key key
;
8413 struct extent_buffer
*next
;
8414 int level
= wc
->level
;
8417 bool need_account
= false;
8419 generation
= btrfs_node_ptr_generation(path
->nodes
[level
],
8420 path
->slots
[level
]);
8422 * if the lower level block was created before the snapshot
8423 * was created, we know there is no need to update back refs
8426 if (wc
->stage
== UPDATE_BACKREF
&&
8427 generation
<= root
->root_key
.offset
) {
8432 bytenr
= btrfs_node_blockptr(path
->nodes
[level
], path
->slots
[level
]);
8433 blocksize
= root
->nodesize
;
8435 next
= btrfs_find_tree_block(root
->fs_info
, bytenr
);
8437 next
= btrfs_find_create_tree_block(root
, bytenr
);
8440 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, next
,
8444 btrfs_tree_lock(next
);
8445 btrfs_set_lock_blocking(next
);
8447 ret
= btrfs_lookup_extent_info(trans
, root
, bytenr
, level
- 1, 1,
8448 &wc
->refs
[level
- 1],
8449 &wc
->flags
[level
- 1]);
8451 btrfs_tree_unlock(next
);
8455 if (unlikely(wc
->refs
[level
- 1] == 0)) {
8456 btrfs_err(root
->fs_info
, "Missing references.");
8461 if (wc
->stage
== DROP_REFERENCE
) {
8462 if (wc
->refs
[level
- 1] > 1) {
8463 need_account
= true;
8465 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
8468 if (!wc
->update_ref
||
8469 generation
<= root
->root_key
.offset
)
8472 btrfs_node_key_to_cpu(path
->nodes
[level
], &key
,
8473 path
->slots
[level
]);
8474 ret
= btrfs_comp_cpu_keys(&key
, &wc
->update_progress
);
8478 wc
->stage
= UPDATE_BACKREF
;
8479 wc
->shared_level
= level
- 1;
8483 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
8487 if (!btrfs_buffer_uptodate(next
, generation
, 0)) {
8488 btrfs_tree_unlock(next
);
8489 free_extent_buffer(next
);
8495 if (reada
&& level
== 1)
8496 reada_walk_down(trans
, root
, wc
, path
);
8497 next
= read_tree_block(root
, bytenr
, generation
);
8499 return PTR_ERR(next
);
8500 } else if (!extent_buffer_uptodate(next
)) {
8501 free_extent_buffer(next
);
8504 btrfs_tree_lock(next
);
8505 btrfs_set_lock_blocking(next
);
8509 BUG_ON(level
!= btrfs_header_level(next
));
8510 path
->nodes
[level
] = next
;
8511 path
->slots
[level
] = 0;
8512 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8518 wc
->refs
[level
- 1] = 0;
8519 wc
->flags
[level
- 1] = 0;
8520 if (wc
->stage
== DROP_REFERENCE
) {
8521 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
) {
8522 parent
= path
->nodes
[level
]->start
;
8524 BUG_ON(root
->root_key
.objectid
!=
8525 btrfs_header_owner(path
->nodes
[level
]));
8530 ret
= account_shared_subtree(trans
, root
, next
,
8531 generation
, level
- 1);
8533 btrfs_err_rl(root
->fs_info
,
8535 "%d accounting shared subtree. Quota "
8536 "is out of sync, rescan required.",
8540 ret
= btrfs_free_extent(trans
, root
, bytenr
, blocksize
, parent
,
8541 root
->root_key
.objectid
, level
- 1, 0);
8542 BUG_ON(ret
); /* -ENOMEM */
8544 btrfs_tree_unlock(next
);
8545 free_extent_buffer(next
);
8551 * helper to process tree block while walking up the tree.
8553 * when wc->stage == DROP_REFERENCE, this function drops
8554 * reference count on the block.
8556 * when wc->stage == UPDATE_BACKREF, this function changes
8557 * wc->stage back to DROP_REFERENCE if we changed wc->stage
8558 * to UPDATE_BACKREF previously while processing the block.
8560 * NOTE: return value 1 means we should stop walking up.
8562 static noinline
int walk_up_proc(struct btrfs_trans_handle
*trans
,
8563 struct btrfs_root
*root
,
8564 struct btrfs_path
*path
,
8565 struct walk_control
*wc
)
8568 int level
= wc
->level
;
8569 struct extent_buffer
*eb
= path
->nodes
[level
];
8572 if (wc
->stage
== UPDATE_BACKREF
) {
8573 BUG_ON(wc
->shared_level
< level
);
8574 if (level
< wc
->shared_level
)
8577 ret
= find_next_key(path
, level
+ 1, &wc
->update_progress
);
8581 wc
->stage
= DROP_REFERENCE
;
8582 wc
->shared_level
= -1;
8583 path
->slots
[level
] = 0;
8586 * check reference count again if the block isn't locked.
8587 * we should start walking down the tree again if reference
8590 if (!path
->locks
[level
]) {
8592 btrfs_tree_lock(eb
);
8593 btrfs_set_lock_blocking(eb
);
8594 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8596 ret
= btrfs_lookup_extent_info(trans
, root
,
8597 eb
->start
, level
, 1,
8601 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
8602 path
->locks
[level
] = 0;
8605 BUG_ON(wc
->refs
[level
] == 0);
8606 if (wc
->refs
[level
] == 1) {
8607 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
8608 path
->locks
[level
] = 0;
8614 /* wc->stage == DROP_REFERENCE */
8615 BUG_ON(wc
->refs
[level
] > 1 && !path
->locks
[level
]);
8617 if (wc
->refs
[level
] == 1) {
8619 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8620 ret
= btrfs_dec_ref(trans
, root
, eb
, 1);
8622 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
8623 BUG_ON(ret
); /* -ENOMEM */
8624 ret
= account_leaf_items(trans
, root
, eb
);
8626 btrfs_err_rl(root
->fs_info
,
8628 "%d accounting leaf items. Quota "
8629 "is out of sync, rescan required.",
8633 /* make block locked assertion in clean_tree_block happy */
8634 if (!path
->locks
[level
] &&
8635 btrfs_header_generation(eb
) == trans
->transid
) {
8636 btrfs_tree_lock(eb
);
8637 btrfs_set_lock_blocking(eb
);
8638 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8640 clean_tree_block(trans
, root
->fs_info
, eb
);
8643 if (eb
== root
->node
) {
8644 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8647 BUG_ON(root
->root_key
.objectid
!=
8648 btrfs_header_owner(eb
));
8650 if (wc
->flags
[level
+ 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8651 parent
= path
->nodes
[level
+ 1]->start
;
8653 BUG_ON(root
->root_key
.objectid
!=
8654 btrfs_header_owner(path
->nodes
[level
+ 1]));
8657 btrfs_free_tree_block(trans
, root
, eb
, parent
, wc
->refs
[level
] == 1);
8659 wc
->refs
[level
] = 0;
8660 wc
->flags
[level
] = 0;
8664 static noinline
int walk_down_tree(struct btrfs_trans_handle
*trans
,
8665 struct btrfs_root
*root
,
8666 struct btrfs_path
*path
,
8667 struct walk_control
*wc
)
8669 int level
= wc
->level
;
8670 int lookup_info
= 1;
8673 while (level
>= 0) {
8674 ret
= walk_down_proc(trans
, root
, path
, wc
, lookup_info
);
8681 if (path
->slots
[level
] >=
8682 btrfs_header_nritems(path
->nodes
[level
]))
8685 ret
= do_walk_down(trans
, root
, path
, wc
, &lookup_info
);
8687 path
->slots
[level
]++;
8696 static noinline
int walk_up_tree(struct btrfs_trans_handle
*trans
,
8697 struct btrfs_root
*root
,
8698 struct btrfs_path
*path
,
8699 struct walk_control
*wc
, int max_level
)
8701 int level
= wc
->level
;
8704 path
->slots
[level
] = btrfs_header_nritems(path
->nodes
[level
]);
8705 while (level
< max_level
&& path
->nodes
[level
]) {
8707 if (path
->slots
[level
] + 1 <
8708 btrfs_header_nritems(path
->nodes
[level
])) {
8709 path
->slots
[level
]++;
8712 ret
= walk_up_proc(trans
, root
, path
, wc
);
8716 if (path
->locks
[level
]) {
8717 btrfs_tree_unlock_rw(path
->nodes
[level
],
8718 path
->locks
[level
]);
8719 path
->locks
[level
] = 0;
8721 free_extent_buffer(path
->nodes
[level
]);
8722 path
->nodes
[level
] = NULL
;
8730 * drop a subvolume tree.
8732 * this function traverses the tree freeing any blocks that only
8733 * referenced by the tree.
8735 * when a shared tree block is found. this function decreases its
8736 * reference count by one. if update_ref is true, this function
8737 * also make sure backrefs for the shared block and all lower level
8738 * blocks are properly updated.
8740 * If called with for_reloc == 0, may exit early with -EAGAIN
8742 int btrfs_drop_snapshot(struct btrfs_root
*root
,
8743 struct btrfs_block_rsv
*block_rsv
, int update_ref
,
8746 struct btrfs_path
*path
;
8747 struct btrfs_trans_handle
*trans
;
8748 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
8749 struct btrfs_root_item
*root_item
= &root
->root_item
;
8750 struct walk_control
*wc
;
8751 struct btrfs_key key
;
8755 bool root_dropped
= false;
8757 btrfs_debug(root
->fs_info
, "Drop subvolume %llu", root
->objectid
);
8759 path
= btrfs_alloc_path();
8765 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
8767 btrfs_free_path(path
);
8772 trans
= btrfs_start_transaction(tree_root
, 0);
8773 if (IS_ERR(trans
)) {
8774 err
= PTR_ERR(trans
);
8779 trans
->block_rsv
= block_rsv
;
8781 if (btrfs_disk_key_objectid(&root_item
->drop_progress
) == 0) {
8782 level
= btrfs_header_level(root
->node
);
8783 path
->nodes
[level
] = btrfs_lock_root_node(root
);
8784 btrfs_set_lock_blocking(path
->nodes
[level
]);
8785 path
->slots
[level
] = 0;
8786 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8787 memset(&wc
->update_progress
, 0,
8788 sizeof(wc
->update_progress
));
8790 btrfs_disk_key_to_cpu(&key
, &root_item
->drop_progress
);
8791 memcpy(&wc
->update_progress
, &key
,
8792 sizeof(wc
->update_progress
));
8794 level
= root_item
->drop_level
;
8796 path
->lowest_level
= level
;
8797 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
8798 path
->lowest_level
= 0;
8806 * unlock our path, this is safe because only this
8807 * function is allowed to delete this snapshot
8809 btrfs_unlock_up_safe(path
, 0);
8811 level
= btrfs_header_level(root
->node
);
8813 btrfs_tree_lock(path
->nodes
[level
]);
8814 btrfs_set_lock_blocking(path
->nodes
[level
]);
8815 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8817 ret
= btrfs_lookup_extent_info(trans
, root
,
8818 path
->nodes
[level
]->start
,
8819 level
, 1, &wc
->refs
[level
],
8825 BUG_ON(wc
->refs
[level
] == 0);
8827 if (level
== root_item
->drop_level
)
8830 btrfs_tree_unlock(path
->nodes
[level
]);
8831 path
->locks
[level
] = 0;
8832 WARN_ON(wc
->refs
[level
] != 1);
8838 wc
->shared_level
= -1;
8839 wc
->stage
= DROP_REFERENCE
;
8840 wc
->update_ref
= update_ref
;
8842 wc
->for_reloc
= for_reloc
;
8843 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(root
);
8847 ret
= walk_down_tree(trans
, root
, path
, wc
);
8853 ret
= walk_up_tree(trans
, root
, path
, wc
, BTRFS_MAX_LEVEL
);
8860 BUG_ON(wc
->stage
!= DROP_REFERENCE
);
8864 if (wc
->stage
== DROP_REFERENCE
) {
8866 btrfs_node_key(path
->nodes
[level
],
8867 &root_item
->drop_progress
,
8868 path
->slots
[level
]);
8869 root_item
->drop_level
= level
;
8872 BUG_ON(wc
->level
== 0);
8873 if (btrfs_should_end_transaction(trans
, tree_root
) ||
8874 (!for_reloc
&& btrfs_need_cleaner_sleep(root
))) {
8875 ret
= btrfs_update_root(trans
, tree_root
,
8879 btrfs_abort_transaction(trans
, tree_root
, ret
);
8884 btrfs_end_transaction_throttle(trans
, tree_root
);
8885 if (!for_reloc
&& btrfs_need_cleaner_sleep(root
)) {
8886 pr_debug("BTRFS: drop snapshot early exit\n");
8891 trans
= btrfs_start_transaction(tree_root
, 0);
8892 if (IS_ERR(trans
)) {
8893 err
= PTR_ERR(trans
);
8897 trans
->block_rsv
= block_rsv
;
8900 btrfs_release_path(path
);
8904 ret
= btrfs_del_root(trans
, tree_root
, &root
->root_key
);
8906 btrfs_abort_transaction(trans
, tree_root
, ret
);
8910 if (root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
) {
8911 ret
= btrfs_find_root(tree_root
, &root
->root_key
, path
,
8914 btrfs_abort_transaction(trans
, tree_root
, ret
);
8917 } else if (ret
> 0) {
8918 /* if we fail to delete the orphan item this time
8919 * around, it'll get picked up the next time.
8921 * The most common failure here is just -ENOENT.
8923 btrfs_del_orphan_item(trans
, tree_root
,
8924 root
->root_key
.objectid
);
8928 if (test_bit(BTRFS_ROOT_IN_RADIX
, &root
->state
)) {
8929 btrfs_add_dropped_root(trans
, root
);
8931 free_extent_buffer(root
->node
);
8932 free_extent_buffer(root
->commit_root
);
8933 btrfs_put_fs_root(root
);
8935 root_dropped
= true;
8937 btrfs_end_transaction_throttle(trans
, tree_root
);
8940 btrfs_free_path(path
);
8943 * So if we need to stop dropping the snapshot for whatever reason we
8944 * need to make sure to add it back to the dead root list so that we
8945 * keep trying to do the work later. This also cleans up roots if we
8946 * don't have it in the radix (like when we recover after a power fail
8947 * or unmount) so we don't leak memory.
8949 if (!for_reloc
&& root_dropped
== false)
8950 btrfs_add_dead_root(root
);
8951 if (err
&& err
!= -EAGAIN
)
8952 btrfs_std_error(root
->fs_info
, err
, NULL
);
8957 * drop subtree rooted at tree block 'node'.
8959 * NOTE: this function will unlock and release tree block 'node'
8960 * only used by relocation code
8962 int btrfs_drop_subtree(struct btrfs_trans_handle
*trans
,
8963 struct btrfs_root
*root
,
8964 struct extent_buffer
*node
,
8965 struct extent_buffer
*parent
)
8967 struct btrfs_path
*path
;
8968 struct walk_control
*wc
;
8974 BUG_ON(root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
);
8976 path
= btrfs_alloc_path();
8980 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
8982 btrfs_free_path(path
);
8986 btrfs_assert_tree_locked(parent
);
8987 parent_level
= btrfs_header_level(parent
);
8988 extent_buffer_get(parent
);
8989 path
->nodes
[parent_level
] = parent
;
8990 path
->slots
[parent_level
] = btrfs_header_nritems(parent
);
8992 btrfs_assert_tree_locked(node
);
8993 level
= btrfs_header_level(node
);
8994 path
->nodes
[level
] = node
;
8995 path
->slots
[level
] = 0;
8996 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8998 wc
->refs
[parent_level
] = 1;
8999 wc
->flags
[parent_level
] = BTRFS_BLOCK_FLAG_FULL_BACKREF
;
9001 wc
->shared_level
= -1;
9002 wc
->stage
= DROP_REFERENCE
;
9006 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(root
);
9009 wret
= walk_down_tree(trans
, root
, path
, wc
);
9015 wret
= walk_up_tree(trans
, root
, path
, wc
, parent_level
);
9023 btrfs_free_path(path
);
9027 static u64
update_block_group_flags(struct btrfs_root
*root
, u64 flags
)
9033 * if restripe for this chunk_type is on pick target profile and
9034 * return, otherwise do the usual balance
9036 stripped
= get_restripe_target(root
->fs_info
, flags
);
9038 return extended_to_chunk(stripped
);
9040 num_devices
= root
->fs_info
->fs_devices
->rw_devices
;
9042 stripped
= BTRFS_BLOCK_GROUP_RAID0
|
9043 BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
|
9044 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID10
;
9046 if (num_devices
== 1) {
9047 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
9048 stripped
= flags
& ~stripped
;
9050 /* turn raid0 into single device chunks */
9051 if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
9054 /* turn mirroring into duplication */
9055 if (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
9056 BTRFS_BLOCK_GROUP_RAID10
))
9057 return stripped
| BTRFS_BLOCK_GROUP_DUP
;
9059 /* they already had raid on here, just return */
9060 if (flags
& stripped
)
9063 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
9064 stripped
= flags
& ~stripped
;
9066 /* switch duplicated blocks with raid1 */
9067 if (flags
& BTRFS_BLOCK_GROUP_DUP
)
9068 return stripped
| BTRFS_BLOCK_GROUP_RAID1
;
9070 /* this is drive concat, leave it alone */
9076 static int inc_block_group_ro(struct btrfs_block_group_cache
*cache
, int force
)
9078 struct btrfs_space_info
*sinfo
= cache
->space_info
;
9080 u64 min_allocable_bytes
;
9084 * We need some metadata space and system metadata space for
9085 * allocating chunks in some corner cases until we force to set
9086 * it to be readonly.
9089 (BTRFS_BLOCK_GROUP_SYSTEM
| BTRFS_BLOCK_GROUP_METADATA
)) &&
9091 min_allocable_bytes
= 1 * 1024 * 1024;
9093 min_allocable_bytes
= 0;
9095 spin_lock(&sinfo
->lock
);
9096 spin_lock(&cache
->lock
);
9104 num_bytes
= cache
->key
.offset
- cache
->reserved
- cache
->pinned
-
9105 cache
->bytes_super
- btrfs_block_group_used(&cache
->item
);
9107 if (sinfo
->bytes_used
+ sinfo
->bytes_reserved
+ sinfo
->bytes_pinned
+
9108 sinfo
->bytes_may_use
+ sinfo
->bytes_readonly
+ num_bytes
+
9109 min_allocable_bytes
<= sinfo
->total_bytes
) {
9110 sinfo
->bytes_readonly
+= num_bytes
;
9112 list_add_tail(&cache
->ro_list
, &sinfo
->ro_bgs
);
9116 spin_unlock(&cache
->lock
);
9117 spin_unlock(&sinfo
->lock
);
9121 int btrfs_inc_block_group_ro(struct btrfs_root
*root
,
9122 struct btrfs_block_group_cache
*cache
)
9125 struct btrfs_trans_handle
*trans
;
9130 trans
= btrfs_join_transaction(root
);
9132 return PTR_ERR(trans
);
9135 * we're not allowed to set block groups readonly after the dirty
9136 * block groups cache has started writing. If it already started,
9137 * back off and let this transaction commit
9139 mutex_lock(&root
->fs_info
->ro_block_group_mutex
);
9140 if (test_bit(BTRFS_TRANS_DIRTY_BG_RUN
, &trans
->transaction
->flags
)) {
9141 u64 transid
= trans
->transid
;
9143 mutex_unlock(&root
->fs_info
->ro_block_group_mutex
);
9144 btrfs_end_transaction(trans
, root
);
9146 ret
= btrfs_wait_for_commit(root
, transid
);
9153 * if we are changing raid levels, try to allocate a corresponding
9154 * block group with the new raid level.
9156 alloc_flags
= update_block_group_flags(root
, cache
->flags
);
9157 if (alloc_flags
!= cache
->flags
) {
9158 ret
= do_chunk_alloc(trans
, root
, alloc_flags
,
9161 * ENOSPC is allowed here, we may have enough space
9162 * already allocated at the new raid level to
9171 ret
= inc_block_group_ro(cache
, 0);
9174 alloc_flags
= get_alloc_profile(root
, cache
->space_info
->flags
);
9175 ret
= do_chunk_alloc(trans
, root
, alloc_flags
,
9179 ret
= inc_block_group_ro(cache
, 0);
9181 if (cache
->flags
& BTRFS_BLOCK_GROUP_SYSTEM
) {
9182 alloc_flags
= update_block_group_flags(root
, cache
->flags
);
9183 lock_chunks(root
->fs_info
->chunk_root
);
9184 check_system_chunk(trans
, root
, alloc_flags
);
9185 unlock_chunks(root
->fs_info
->chunk_root
);
9187 mutex_unlock(&root
->fs_info
->ro_block_group_mutex
);
9189 btrfs_end_transaction(trans
, root
);
9193 int btrfs_force_chunk_alloc(struct btrfs_trans_handle
*trans
,
9194 struct btrfs_root
*root
, u64 type
)
9196 u64 alloc_flags
= get_alloc_profile(root
, type
);
9197 return do_chunk_alloc(trans
, root
, alloc_flags
,
9202 * helper to account the unused space of all the readonly block group in the
9203 * space_info. takes mirrors into account.
9205 u64
btrfs_account_ro_block_groups_free_space(struct btrfs_space_info
*sinfo
)
9207 struct btrfs_block_group_cache
*block_group
;
9211 /* It's df, we don't care if it's racey */
9212 if (list_empty(&sinfo
->ro_bgs
))
9215 spin_lock(&sinfo
->lock
);
9216 list_for_each_entry(block_group
, &sinfo
->ro_bgs
, ro_list
) {
9217 spin_lock(&block_group
->lock
);
9219 if (!block_group
->ro
) {
9220 spin_unlock(&block_group
->lock
);
9224 if (block_group
->flags
& (BTRFS_BLOCK_GROUP_RAID1
|
9225 BTRFS_BLOCK_GROUP_RAID10
|
9226 BTRFS_BLOCK_GROUP_DUP
))
9231 free_bytes
+= (block_group
->key
.offset
-
9232 btrfs_block_group_used(&block_group
->item
)) *
9235 spin_unlock(&block_group
->lock
);
9237 spin_unlock(&sinfo
->lock
);
9242 void btrfs_dec_block_group_ro(struct btrfs_root
*root
,
9243 struct btrfs_block_group_cache
*cache
)
9245 struct btrfs_space_info
*sinfo
= cache
->space_info
;
9250 spin_lock(&sinfo
->lock
);
9251 spin_lock(&cache
->lock
);
9253 num_bytes
= cache
->key
.offset
- cache
->reserved
-
9254 cache
->pinned
- cache
->bytes_super
-
9255 btrfs_block_group_used(&cache
->item
);
9256 sinfo
->bytes_readonly
-= num_bytes
;
9257 list_del_init(&cache
->ro_list
);
9259 spin_unlock(&cache
->lock
);
9260 spin_unlock(&sinfo
->lock
);
9264 * checks to see if its even possible to relocate this block group.
9266 * @return - -1 if it's not a good idea to relocate this block group, 0 if its
9267 * ok to go ahead and try.
9269 int btrfs_can_relocate(struct btrfs_root
*root
, u64 bytenr
)
9271 struct btrfs_block_group_cache
*block_group
;
9272 struct btrfs_space_info
*space_info
;
9273 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
9274 struct btrfs_device
*device
;
9275 struct btrfs_trans_handle
*trans
;
9284 block_group
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
9286 /* odd, couldn't find the block group, leave it alone */
9290 min_free
= btrfs_block_group_used(&block_group
->item
);
9292 /* no bytes used, we're good */
9296 space_info
= block_group
->space_info
;
9297 spin_lock(&space_info
->lock
);
9299 full
= space_info
->full
;
9302 * if this is the last block group we have in this space, we can't
9303 * relocate it unless we're able to allocate a new chunk below.
9305 * Otherwise, we need to make sure we have room in the space to handle
9306 * all of the extents from this block group. If we can, we're good
9308 if ((space_info
->total_bytes
!= block_group
->key
.offset
) &&
9309 (space_info
->bytes_used
+ space_info
->bytes_reserved
+
9310 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
9311 min_free
< space_info
->total_bytes
)) {
9312 spin_unlock(&space_info
->lock
);
9315 spin_unlock(&space_info
->lock
);
9318 * ok we don't have enough space, but maybe we have free space on our
9319 * devices to allocate new chunks for relocation, so loop through our
9320 * alloc devices and guess if we have enough space. if this block
9321 * group is going to be restriped, run checks against the target
9322 * profile instead of the current one.
9334 target
= get_restripe_target(root
->fs_info
, block_group
->flags
);
9336 index
= __get_raid_index(extended_to_chunk(target
));
9339 * this is just a balance, so if we were marked as full
9340 * we know there is no space for a new chunk
9345 index
= get_block_group_index(block_group
);
9348 if (index
== BTRFS_RAID_RAID10
) {
9352 } else if (index
== BTRFS_RAID_RAID1
) {
9354 } else if (index
== BTRFS_RAID_DUP
) {
9357 } else if (index
== BTRFS_RAID_RAID0
) {
9358 dev_min
= fs_devices
->rw_devices
;
9359 min_free
= div64_u64(min_free
, dev_min
);
9362 /* We need to do this so that we can look at pending chunks */
9363 trans
= btrfs_join_transaction(root
);
9364 if (IS_ERR(trans
)) {
9365 ret
= PTR_ERR(trans
);
9369 mutex_lock(&root
->fs_info
->chunk_mutex
);
9370 list_for_each_entry(device
, &fs_devices
->alloc_list
, dev_alloc_list
) {
9374 * check to make sure we can actually find a chunk with enough
9375 * space to fit our block group in.
9377 if (device
->total_bytes
> device
->bytes_used
+ min_free
&&
9378 !device
->is_tgtdev_for_dev_replace
) {
9379 ret
= find_free_dev_extent(trans
, device
, min_free
,
9384 if (dev_nr
>= dev_min
)
9390 mutex_unlock(&root
->fs_info
->chunk_mutex
);
9391 btrfs_end_transaction(trans
, root
);
9393 btrfs_put_block_group(block_group
);
9397 static int find_first_block_group(struct btrfs_root
*root
,
9398 struct btrfs_path
*path
, struct btrfs_key
*key
)
9401 struct btrfs_key found_key
;
9402 struct extent_buffer
*leaf
;
9405 ret
= btrfs_search_slot(NULL
, root
, key
, path
, 0, 0);
9410 slot
= path
->slots
[0];
9411 leaf
= path
->nodes
[0];
9412 if (slot
>= btrfs_header_nritems(leaf
)) {
9413 ret
= btrfs_next_leaf(root
, path
);
9420 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
9422 if (found_key
.objectid
>= key
->objectid
&&
9423 found_key
.type
== BTRFS_BLOCK_GROUP_ITEM_KEY
) {
9433 void btrfs_put_block_group_cache(struct btrfs_fs_info
*info
)
9435 struct btrfs_block_group_cache
*block_group
;
9439 struct inode
*inode
;
9441 block_group
= btrfs_lookup_first_block_group(info
, last
);
9442 while (block_group
) {
9443 spin_lock(&block_group
->lock
);
9444 if (block_group
->iref
)
9446 spin_unlock(&block_group
->lock
);
9447 block_group
= next_block_group(info
->tree_root
,
9457 inode
= block_group
->inode
;
9458 block_group
->iref
= 0;
9459 block_group
->inode
= NULL
;
9460 spin_unlock(&block_group
->lock
);
9462 last
= block_group
->key
.objectid
+ block_group
->key
.offset
;
9463 btrfs_put_block_group(block_group
);
9467 int btrfs_free_block_groups(struct btrfs_fs_info
*info
)
9469 struct btrfs_block_group_cache
*block_group
;
9470 struct btrfs_space_info
*space_info
;
9471 struct btrfs_caching_control
*caching_ctl
;
9474 down_write(&info
->commit_root_sem
);
9475 while (!list_empty(&info
->caching_block_groups
)) {
9476 caching_ctl
= list_entry(info
->caching_block_groups
.next
,
9477 struct btrfs_caching_control
, list
);
9478 list_del(&caching_ctl
->list
);
9479 put_caching_control(caching_ctl
);
9481 up_write(&info
->commit_root_sem
);
9483 spin_lock(&info
->unused_bgs_lock
);
9484 while (!list_empty(&info
->unused_bgs
)) {
9485 block_group
= list_first_entry(&info
->unused_bgs
,
9486 struct btrfs_block_group_cache
,
9488 list_del_init(&block_group
->bg_list
);
9489 btrfs_put_block_group(block_group
);
9491 spin_unlock(&info
->unused_bgs_lock
);
9493 spin_lock(&info
->block_group_cache_lock
);
9494 while ((n
= rb_last(&info
->block_group_cache_tree
)) != NULL
) {
9495 block_group
= rb_entry(n
, struct btrfs_block_group_cache
,
9497 rb_erase(&block_group
->cache_node
,
9498 &info
->block_group_cache_tree
);
9499 RB_CLEAR_NODE(&block_group
->cache_node
);
9500 spin_unlock(&info
->block_group_cache_lock
);
9502 down_write(&block_group
->space_info
->groups_sem
);
9503 list_del(&block_group
->list
);
9504 up_write(&block_group
->space_info
->groups_sem
);
9506 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
9507 wait_block_group_cache_done(block_group
);
9510 * We haven't cached this block group, which means we could
9511 * possibly have excluded extents on this block group.
9513 if (block_group
->cached
== BTRFS_CACHE_NO
||
9514 block_group
->cached
== BTRFS_CACHE_ERROR
)
9515 free_excluded_extents(info
->extent_root
, block_group
);
9517 btrfs_remove_free_space_cache(block_group
);
9518 btrfs_put_block_group(block_group
);
9520 spin_lock(&info
->block_group_cache_lock
);
9522 spin_unlock(&info
->block_group_cache_lock
);
9524 /* now that all the block groups are freed, go through and
9525 * free all the space_info structs. This is only called during
9526 * the final stages of unmount, and so we know nobody is
9527 * using them. We call synchronize_rcu() once before we start,
9528 * just to be on the safe side.
9532 release_global_block_rsv(info
);
9534 while (!list_empty(&info
->space_info
)) {
9537 space_info
= list_entry(info
->space_info
.next
,
9538 struct btrfs_space_info
,
9540 if (btrfs_test_opt(info
->tree_root
, ENOSPC_DEBUG
)) {
9541 if (WARN_ON(space_info
->bytes_pinned
> 0 ||
9542 space_info
->bytes_reserved
> 0 ||
9543 space_info
->bytes_may_use
> 0)) {
9544 dump_space_info(space_info
, 0, 0);
9547 list_del(&space_info
->list
);
9548 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++) {
9549 struct kobject
*kobj
;
9550 kobj
= space_info
->block_group_kobjs
[i
];
9551 space_info
->block_group_kobjs
[i
] = NULL
;
9557 kobject_del(&space_info
->kobj
);
9558 kobject_put(&space_info
->kobj
);
9563 static void __link_block_group(struct btrfs_space_info
*space_info
,
9564 struct btrfs_block_group_cache
*cache
)
9566 int index
= get_block_group_index(cache
);
9569 down_write(&space_info
->groups_sem
);
9570 if (list_empty(&space_info
->block_groups
[index
]))
9572 list_add_tail(&cache
->list
, &space_info
->block_groups
[index
]);
9573 up_write(&space_info
->groups_sem
);
9576 struct raid_kobject
*rkobj
;
9579 rkobj
= kzalloc(sizeof(*rkobj
), GFP_NOFS
);
9582 rkobj
->raid_type
= index
;
9583 kobject_init(&rkobj
->kobj
, &btrfs_raid_ktype
);
9584 ret
= kobject_add(&rkobj
->kobj
, &space_info
->kobj
,
9585 "%s", get_raid_name(index
));
9587 kobject_put(&rkobj
->kobj
);
9590 space_info
->block_group_kobjs
[index
] = &rkobj
->kobj
;
9595 pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n");
9598 static struct btrfs_block_group_cache
*
9599 btrfs_create_block_group_cache(struct btrfs_root
*root
, u64 start
, u64 size
)
9601 struct btrfs_block_group_cache
*cache
;
9603 cache
= kzalloc(sizeof(*cache
), GFP_NOFS
);
9607 cache
->free_space_ctl
= kzalloc(sizeof(*cache
->free_space_ctl
),
9609 if (!cache
->free_space_ctl
) {
9614 cache
->key
.objectid
= start
;
9615 cache
->key
.offset
= size
;
9616 cache
->key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
9618 cache
->sectorsize
= root
->sectorsize
;
9619 cache
->fs_info
= root
->fs_info
;
9620 cache
->full_stripe_len
= btrfs_full_stripe_len(root
,
9621 &root
->fs_info
->mapping_tree
,
9623 atomic_set(&cache
->count
, 1);
9624 spin_lock_init(&cache
->lock
);
9625 init_rwsem(&cache
->data_rwsem
);
9626 INIT_LIST_HEAD(&cache
->list
);
9627 INIT_LIST_HEAD(&cache
->cluster_list
);
9628 INIT_LIST_HEAD(&cache
->bg_list
);
9629 INIT_LIST_HEAD(&cache
->ro_list
);
9630 INIT_LIST_HEAD(&cache
->dirty_list
);
9631 INIT_LIST_HEAD(&cache
->io_list
);
9632 btrfs_init_free_space_ctl(cache
);
9633 atomic_set(&cache
->trimming
, 0);
9638 int btrfs_read_block_groups(struct btrfs_root
*root
)
9640 struct btrfs_path
*path
;
9642 struct btrfs_block_group_cache
*cache
;
9643 struct btrfs_fs_info
*info
= root
->fs_info
;
9644 struct btrfs_space_info
*space_info
;
9645 struct btrfs_key key
;
9646 struct btrfs_key found_key
;
9647 struct extent_buffer
*leaf
;
9651 root
= info
->extent_root
;
9654 key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
9655 path
= btrfs_alloc_path();
9660 cache_gen
= btrfs_super_cache_generation(root
->fs_info
->super_copy
);
9661 if (btrfs_test_opt(root
, SPACE_CACHE
) &&
9662 btrfs_super_generation(root
->fs_info
->super_copy
) != cache_gen
)
9664 if (btrfs_test_opt(root
, CLEAR_CACHE
))
9668 ret
= find_first_block_group(root
, path
, &key
);
9674 leaf
= path
->nodes
[0];
9675 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
9677 cache
= btrfs_create_block_group_cache(root
, found_key
.objectid
,
9686 * When we mount with old space cache, we need to
9687 * set BTRFS_DC_CLEAR and set dirty flag.
9689 * a) Setting 'BTRFS_DC_CLEAR' makes sure that we
9690 * truncate the old free space cache inode and
9692 * b) Setting 'dirty flag' makes sure that we flush
9693 * the new space cache info onto disk.
9695 if (btrfs_test_opt(root
, SPACE_CACHE
))
9696 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
9699 read_extent_buffer(leaf
, &cache
->item
,
9700 btrfs_item_ptr_offset(leaf
, path
->slots
[0]),
9701 sizeof(cache
->item
));
9702 cache
->flags
= btrfs_block_group_flags(&cache
->item
);
9704 key
.objectid
= found_key
.objectid
+ found_key
.offset
;
9705 btrfs_release_path(path
);
9708 * We need to exclude the super stripes now so that the space
9709 * info has super bytes accounted for, otherwise we'll think
9710 * we have more space than we actually do.
9712 ret
= exclude_super_stripes(root
, cache
);
9715 * We may have excluded something, so call this just in
9718 free_excluded_extents(root
, cache
);
9719 btrfs_put_block_group(cache
);
9724 * check for two cases, either we are full, and therefore
9725 * don't need to bother with the caching work since we won't
9726 * find any space, or we are empty, and we can just add all
9727 * the space in and be done with it. This saves us _alot_ of
9728 * time, particularly in the full case.
9730 if (found_key
.offset
== btrfs_block_group_used(&cache
->item
)) {
9731 cache
->last_byte_to_unpin
= (u64
)-1;
9732 cache
->cached
= BTRFS_CACHE_FINISHED
;
9733 free_excluded_extents(root
, cache
);
9734 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
9735 cache
->last_byte_to_unpin
= (u64
)-1;
9736 cache
->cached
= BTRFS_CACHE_FINISHED
;
9737 add_new_free_space(cache
, root
->fs_info
,
9739 found_key
.objectid
+
9741 free_excluded_extents(root
, cache
);
9744 ret
= btrfs_add_block_group_cache(root
->fs_info
, cache
);
9746 btrfs_remove_free_space_cache(cache
);
9747 btrfs_put_block_group(cache
);
9751 ret
= update_space_info(info
, cache
->flags
, found_key
.offset
,
9752 btrfs_block_group_used(&cache
->item
),
9755 btrfs_remove_free_space_cache(cache
);
9756 spin_lock(&info
->block_group_cache_lock
);
9757 rb_erase(&cache
->cache_node
,
9758 &info
->block_group_cache_tree
);
9759 RB_CLEAR_NODE(&cache
->cache_node
);
9760 spin_unlock(&info
->block_group_cache_lock
);
9761 btrfs_put_block_group(cache
);
9765 cache
->space_info
= space_info
;
9766 spin_lock(&cache
->space_info
->lock
);
9767 cache
->space_info
->bytes_readonly
+= cache
->bytes_super
;
9768 spin_unlock(&cache
->space_info
->lock
);
9770 __link_block_group(space_info
, cache
);
9772 set_avail_alloc_bits(root
->fs_info
, cache
->flags
);
9773 if (btrfs_chunk_readonly(root
, cache
->key
.objectid
)) {
9774 inc_block_group_ro(cache
, 1);
9775 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
9776 spin_lock(&info
->unused_bgs_lock
);
9777 /* Should always be true but just in case. */
9778 if (list_empty(&cache
->bg_list
)) {
9779 btrfs_get_block_group(cache
);
9780 list_add_tail(&cache
->bg_list
,
9783 spin_unlock(&info
->unused_bgs_lock
);
9787 list_for_each_entry_rcu(space_info
, &root
->fs_info
->space_info
, list
) {
9788 if (!(get_alloc_profile(root
, space_info
->flags
) &
9789 (BTRFS_BLOCK_GROUP_RAID10
|
9790 BTRFS_BLOCK_GROUP_RAID1
|
9791 BTRFS_BLOCK_GROUP_RAID5
|
9792 BTRFS_BLOCK_GROUP_RAID6
|
9793 BTRFS_BLOCK_GROUP_DUP
)))
9796 * avoid allocating from un-mirrored block group if there are
9797 * mirrored block groups.
9799 list_for_each_entry(cache
,
9800 &space_info
->block_groups
[BTRFS_RAID_RAID0
],
9802 inc_block_group_ro(cache
, 1);
9803 list_for_each_entry(cache
,
9804 &space_info
->block_groups
[BTRFS_RAID_SINGLE
],
9806 inc_block_group_ro(cache
, 1);
9809 init_global_block_rsv(info
);
9812 btrfs_free_path(path
);
9816 void btrfs_create_pending_block_groups(struct btrfs_trans_handle
*trans
,
9817 struct btrfs_root
*root
)
9819 struct btrfs_block_group_cache
*block_group
, *tmp
;
9820 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
9821 struct btrfs_block_group_item item
;
9822 struct btrfs_key key
;
9824 bool can_flush_pending_bgs
= trans
->can_flush_pending_bgs
;
9826 trans
->can_flush_pending_bgs
= false;
9827 list_for_each_entry_safe(block_group
, tmp
, &trans
->new_bgs
, bg_list
) {
9831 spin_lock(&block_group
->lock
);
9832 memcpy(&item
, &block_group
->item
, sizeof(item
));
9833 memcpy(&key
, &block_group
->key
, sizeof(key
));
9834 spin_unlock(&block_group
->lock
);
9836 ret
= btrfs_insert_item(trans
, extent_root
, &key
, &item
,
9839 btrfs_abort_transaction(trans
, extent_root
, ret
);
9840 ret
= btrfs_finish_chunk_alloc(trans
, extent_root
,
9841 key
.objectid
, key
.offset
);
9843 btrfs_abort_transaction(trans
, extent_root
, ret
);
9845 list_del_init(&block_group
->bg_list
);
9847 trans
->can_flush_pending_bgs
= can_flush_pending_bgs
;
9850 int btrfs_make_block_group(struct btrfs_trans_handle
*trans
,
9851 struct btrfs_root
*root
, u64 bytes_used
,
9852 u64 type
, u64 chunk_objectid
, u64 chunk_offset
,
9856 struct btrfs_root
*extent_root
;
9857 struct btrfs_block_group_cache
*cache
;
9859 extent_root
= root
->fs_info
->extent_root
;
9861 btrfs_set_log_full_commit(root
->fs_info
, trans
);
9863 cache
= btrfs_create_block_group_cache(root
, chunk_offset
, size
);
9867 btrfs_set_block_group_used(&cache
->item
, bytes_used
);
9868 btrfs_set_block_group_chunk_objectid(&cache
->item
, chunk_objectid
);
9869 btrfs_set_block_group_flags(&cache
->item
, type
);
9871 cache
->flags
= type
;
9872 cache
->last_byte_to_unpin
= (u64
)-1;
9873 cache
->cached
= BTRFS_CACHE_FINISHED
;
9874 ret
= exclude_super_stripes(root
, cache
);
9877 * We may have excluded something, so call this just in
9880 free_excluded_extents(root
, cache
);
9881 btrfs_put_block_group(cache
);
9885 add_new_free_space(cache
, root
->fs_info
, chunk_offset
,
9886 chunk_offset
+ size
);
9888 free_excluded_extents(root
, cache
);
9890 #ifdef CONFIG_BTRFS_DEBUG
9891 if (btrfs_should_fragment_free_space(root
, cache
)) {
9892 u64 new_bytes_used
= size
- bytes_used
;
9894 bytes_used
+= new_bytes_used
>> 1;
9895 fragment_free_space(root
, cache
);
9899 * Call to ensure the corresponding space_info object is created and
9900 * assigned to our block group, but don't update its counters just yet.
9901 * We want our bg to be added to the rbtree with its ->space_info set.
9903 ret
= update_space_info(root
->fs_info
, cache
->flags
, 0, 0,
9904 &cache
->space_info
);
9906 btrfs_remove_free_space_cache(cache
);
9907 btrfs_put_block_group(cache
);
9911 ret
= btrfs_add_block_group_cache(root
->fs_info
, cache
);
9913 btrfs_remove_free_space_cache(cache
);
9914 btrfs_put_block_group(cache
);
9919 * Now that our block group has its ->space_info set and is inserted in
9920 * the rbtree, update the space info's counters.
9922 ret
= update_space_info(root
->fs_info
, cache
->flags
, size
, bytes_used
,
9923 &cache
->space_info
);
9925 btrfs_remove_free_space_cache(cache
);
9926 spin_lock(&root
->fs_info
->block_group_cache_lock
);
9927 rb_erase(&cache
->cache_node
,
9928 &root
->fs_info
->block_group_cache_tree
);
9929 RB_CLEAR_NODE(&cache
->cache_node
);
9930 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
9931 btrfs_put_block_group(cache
);
9934 update_global_block_rsv(root
->fs_info
);
9936 spin_lock(&cache
->space_info
->lock
);
9937 cache
->space_info
->bytes_readonly
+= cache
->bytes_super
;
9938 spin_unlock(&cache
->space_info
->lock
);
9940 __link_block_group(cache
->space_info
, cache
);
9942 list_add_tail(&cache
->bg_list
, &trans
->new_bgs
);
9944 set_avail_alloc_bits(extent_root
->fs_info
, type
);
9949 static void clear_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
9951 u64 extra_flags
= chunk_to_extended(flags
) &
9952 BTRFS_EXTENDED_PROFILE_MASK
;
9954 write_seqlock(&fs_info
->profiles_lock
);
9955 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
9956 fs_info
->avail_data_alloc_bits
&= ~extra_flags
;
9957 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
9958 fs_info
->avail_metadata_alloc_bits
&= ~extra_flags
;
9959 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
9960 fs_info
->avail_system_alloc_bits
&= ~extra_flags
;
9961 write_sequnlock(&fs_info
->profiles_lock
);
9964 int btrfs_remove_block_group(struct btrfs_trans_handle
*trans
,
9965 struct btrfs_root
*root
, u64 group_start
,
9966 struct extent_map
*em
)
9968 struct btrfs_path
*path
;
9969 struct btrfs_block_group_cache
*block_group
;
9970 struct btrfs_free_cluster
*cluster
;
9971 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
9972 struct btrfs_key key
;
9973 struct inode
*inode
;
9974 struct kobject
*kobj
= NULL
;
9978 struct btrfs_caching_control
*caching_ctl
= NULL
;
9981 root
= root
->fs_info
->extent_root
;
9983 block_group
= btrfs_lookup_block_group(root
->fs_info
, group_start
);
9984 BUG_ON(!block_group
);
9985 BUG_ON(!block_group
->ro
);
9988 * Free the reserved super bytes from this block group before
9991 free_excluded_extents(root
, block_group
);
9993 memcpy(&key
, &block_group
->key
, sizeof(key
));
9994 index
= get_block_group_index(block_group
);
9995 if (block_group
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
9996 BTRFS_BLOCK_GROUP_RAID1
|
9997 BTRFS_BLOCK_GROUP_RAID10
))
10002 /* make sure this block group isn't part of an allocation cluster */
10003 cluster
= &root
->fs_info
->data_alloc_cluster
;
10004 spin_lock(&cluster
->refill_lock
);
10005 btrfs_return_cluster_to_free_space(block_group
, cluster
);
10006 spin_unlock(&cluster
->refill_lock
);
10009 * make sure this block group isn't part of a metadata
10010 * allocation cluster
10012 cluster
= &root
->fs_info
->meta_alloc_cluster
;
10013 spin_lock(&cluster
->refill_lock
);
10014 btrfs_return_cluster_to_free_space(block_group
, cluster
);
10015 spin_unlock(&cluster
->refill_lock
);
10017 path
= btrfs_alloc_path();
10024 * get the inode first so any iput calls done for the io_list
10025 * aren't the final iput (no unlinks allowed now)
10027 inode
= lookup_free_space_inode(tree_root
, block_group
, path
);
10029 mutex_lock(&trans
->transaction
->cache_write_mutex
);
10031 * make sure our free spache cache IO is done before remove the
10034 spin_lock(&trans
->transaction
->dirty_bgs_lock
);
10035 if (!list_empty(&block_group
->io_list
)) {
10036 list_del_init(&block_group
->io_list
);
10038 WARN_ON(!IS_ERR(inode
) && inode
!= block_group
->io_ctl
.inode
);
10040 spin_unlock(&trans
->transaction
->dirty_bgs_lock
);
10041 btrfs_wait_cache_io(root
, trans
, block_group
,
10042 &block_group
->io_ctl
, path
,
10043 block_group
->key
.objectid
);
10044 btrfs_put_block_group(block_group
);
10045 spin_lock(&trans
->transaction
->dirty_bgs_lock
);
10048 if (!list_empty(&block_group
->dirty_list
)) {
10049 list_del_init(&block_group
->dirty_list
);
10050 btrfs_put_block_group(block_group
);
10052 spin_unlock(&trans
->transaction
->dirty_bgs_lock
);
10053 mutex_unlock(&trans
->transaction
->cache_write_mutex
);
10055 if (!IS_ERR(inode
)) {
10056 ret
= btrfs_orphan_add(trans
, inode
);
10058 btrfs_add_delayed_iput(inode
);
10061 clear_nlink(inode
);
10062 /* One for the block groups ref */
10063 spin_lock(&block_group
->lock
);
10064 if (block_group
->iref
) {
10065 block_group
->iref
= 0;
10066 block_group
->inode
= NULL
;
10067 spin_unlock(&block_group
->lock
);
10070 spin_unlock(&block_group
->lock
);
10072 /* One for our lookup ref */
10073 btrfs_add_delayed_iput(inode
);
10076 key
.objectid
= BTRFS_FREE_SPACE_OBJECTID
;
10077 key
.offset
= block_group
->key
.objectid
;
10080 ret
= btrfs_search_slot(trans
, tree_root
, &key
, path
, -1, 1);
10084 btrfs_release_path(path
);
10086 ret
= btrfs_del_item(trans
, tree_root
, path
);
10089 btrfs_release_path(path
);
10092 spin_lock(&root
->fs_info
->block_group_cache_lock
);
10093 rb_erase(&block_group
->cache_node
,
10094 &root
->fs_info
->block_group_cache_tree
);
10095 RB_CLEAR_NODE(&block_group
->cache_node
);
10097 if (root
->fs_info
->first_logical_byte
== block_group
->key
.objectid
)
10098 root
->fs_info
->first_logical_byte
= (u64
)-1;
10099 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
10101 down_write(&block_group
->space_info
->groups_sem
);
10103 * we must use list_del_init so people can check to see if they
10104 * are still on the list after taking the semaphore
10106 list_del_init(&block_group
->list
);
10107 if (list_empty(&block_group
->space_info
->block_groups
[index
])) {
10108 kobj
= block_group
->space_info
->block_group_kobjs
[index
];
10109 block_group
->space_info
->block_group_kobjs
[index
] = NULL
;
10110 clear_avail_alloc_bits(root
->fs_info
, block_group
->flags
);
10112 up_write(&block_group
->space_info
->groups_sem
);
10118 if (block_group
->has_caching_ctl
)
10119 caching_ctl
= get_caching_control(block_group
);
10120 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
10121 wait_block_group_cache_done(block_group
);
10122 if (block_group
->has_caching_ctl
) {
10123 down_write(&root
->fs_info
->commit_root_sem
);
10124 if (!caching_ctl
) {
10125 struct btrfs_caching_control
*ctl
;
10127 list_for_each_entry(ctl
,
10128 &root
->fs_info
->caching_block_groups
, list
)
10129 if (ctl
->block_group
== block_group
) {
10131 atomic_inc(&caching_ctl
->count
);
10136 list_del_init(&caching_ctl
->list
);
10137 up_write(&root
->fs_info
->commit_root_sem
);
10139 /* Once for the caching bgs list and once for us. */
10140 put_caching_control(caching_ctl
);
10141 put_caching_control(caching_ctl
);
10145 spin_lock(&trans
->transaction
->dirty_bgs_lock
);
10146 if (!list_empty(&block_group
->dirty_list
)) {
10149 if (!list_empty(&block_group
->io_list
)) {
10152 spin_unlock(&trans
->transaction
->dirty_bgs_lock
);
10153 btrfs_remove_free_space_cache(block_group
);
10155 spin_lock(&block_group
->space_info
->lock
);
10156 list_del_init(&block_group
->ro_list
);
10158 if (btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
10159 WARN_ON(block_group
->space_info
->total_bytes
10160 < block_group
->key
.offset
);
10161 WARN_ON(block_group
->space_info
->bytes_readonly
10162 < block_group
->key
.offset
);
10163 WARN_ON(block_group
->space_info
->disk_total
10164 < block_group
->key
.offset
* factor
);
10166 block_group
->space_info
->total_bytes
-= block_group
->key
.offset
;
10167 block_group
->space_info
->bytes_readonly
-= block_group
->key
.offset
;
10168 block_group
->space_info
->disk_total
-= block_group
->key
.offset
* factor
;
10170 spin_unlock(&block_group
->space_info
->lock
);
10172 memcpy(&key
, &block_group
->key
, sizeof(key
));
10175 if (!list_empty(&em
->list
)) {
10176 /* We're in the transaction->pending_chunks list. */
10177 free_extent_map(em
);
10179 spin_lock(&block_group
->lock
);
10180 block_group
->removed
= 1;
10182 * At this point trimming can't start on this block group, because we
10183 * removed the block group from the tree fs_info->block_group_cache_tree
10184 * so no one can't find it anymore and even if someone already got this
10185 * block group before we removed it from the rbtree, they have already
10186 * incremented block_group->trimming - if they didn't, they won't find
10187 * any free space entries because we already removed them all when we
10188 * called btrfs_remove_free_space_cache().
10190 * And we must not remove the extent map from the fs_info->mapping_tree
10191 * to prevent the same logical address range and physical device space
10192 * ranges from being reused for a new block group. This is because our
10193 * fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is
10194 * completely transactionless, so while it is trimming a range the
10195 * currently running transaction might finish and a new one start,
10196 * allowing for new block groups to be created that can reuse the same
10197 * physical device locations unless we take this special care.
10199 * There may also be an implicit trim operation if the file system
10200 * is mounted with -odiscard. The same protections must remain
10201 * in place until the extents have been discarded completely when
10202 * the transaction commit has completed.
10204 remove_em
= (atomic_read(&block_group
->trimming
) == 0);
10206 * Make sure a trimmer task always sees the em in the pinned_chunks list
10207 * if it sees block_group->removed == 1 (needs to lock block_group->lock
10208 * before checking block_group->removed).
10212 * Our em might be in trans->transaction->pending_chunks which
10213 * is protected by fs_info->chunk_mutex ([lock|unlock]_chunks),
10214 * and so is the fs_info->pinned_chunks list.
10216 * So at this point we must be holding the chunk_mutex to avoid
10217 * any races with chunk allocation (more specifically at
10218 * volumes.c:contains_pending_extent()), to ensure it always
10219 * sees the em, either in the pending_chunks list or in the
10220 * pinned_chunks list.
10222 list_move_tail(&em
->list
, &root
->fs_info
->pinned_chunks
);
10224 spin_unlock(&block_group
->lock
);
10227 struct extent_map_tree
*em_tree
;
10229 em_tree
= &root
->fs_info
->mapping_tree
.map_tree
;
10230 write_lock(&em_tree
->lock
);
10232 * The em might be in the pending_chunks list, so make sure the
10233 * chunk mutex is locked, since remove_extent_mapping() will
10234 * delete us from that list.
10236 remove_extent_mapping(em_tree
, em
);
10237 write_unlock(&em_tree
->lock
);
10238 /* once for the tree */
10239 free_extent_map(em
);
10242 unlock_chunks(root
);
10244 btrfs_put_block_group(block_group
);
10245 btrfs_put_block_group(block_group
);
10247 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
10253 ret
= btrfs_del_item(trans
, root
, path
);
10255 btrfs_free_path(path
);
10259 struct btrfs_trans_handle
*
10260 btrfs_start_trans_remove_block_group(struct btrfs_fs_info
*fs_info
)
10263 * 1 unit for adding the free space inode's orphan (located in the tree
10266 return btrfs_start_transaction_fallback_global_rsv(fs_info
->extent_root
,
10271 * Process the unused_bgs list and remove any that don't have any allocated
10272 * space inside of them.
10274 void btrfs_delete_unused_bgs(struct btrfs_fs_info
*fs_info
)
10276 struct btrfs_block_group_cache
*block_group
;
10277 struct btrfs_space_info
*space_info
;
10278 struct btrfs_root
*root
= fs_info
->extent_root
;
10279 struct btrfs_trans_handle
*trans
;
10282 if (!fs_info
->open
)
10285 spin_lock(&fs_info
->unused_bgs_lock
);
10286 while (!list_empty(&fs_info
->unused_bgs
)) {
10290 block_group
= list_first_entry(&fs_info
->unused_bgs
,
10291 struct btrfs_block_group_cache
,
10293 list_del_init(&block_group
->bg_list
);
10295 space_info
= block_group
->space_info
;
10297 if (ret
|| btrfs_mixed_space_info(space_info
)) {
10298 btrfs_put_block_group(block_group
);
10301 spin_unlock(&fs_info
->unused_bgs_lock
);
10303 mutex_lock(&fs_info
->delete_unused_bgs_mutex
);
10305 /* Don't want to race with allocators so take the groups_sem */
10306 down_write(&space_info
->groups_sem
);
10307 spin_lock(&block_group
->lock
);
10308 if (block_group
->reserved
||
10309 btrfs_block_group_used(&block_group
->item
) ||
10311 list_is_singular(&block_group
->list
)) {
10313 * We want to bail if we made new allocations or have
10314 * outstanding allocations in this block group. We do
10315 * the ro check in case balance is currently acting on
10316 * this block group.
10318 spin_unlock(&block_group
->lock
);
10319 up_write(&space_info
->groups_sem
);
10322 spin_unlock(&block_group
->lock
);
10324 /* We don't want to force the issue, only flip if it's ok. */
10325 ret
= inc_block_group_ro(block_group
, 0);
10326 up_write(&space_info
->groups_sem
);
10333 * Want to do this before we do anything else so we can recover
10334 * properly if we fail to join the transaction.
10336 trans
= btrfs_start_trans_remove_block_group(fs_info
);
10337 if (IS_ERR(trans
)) {
10338 btrfs_dec_block_group_ro(root
, block_group
);
10339 ret
= PTR_ERR(trans
);
10344 * We could have pending pinned extents for this block group,
10345 * just delete them, we don't care about them anymore.
10347 start
= block_group
->key
.objectid
;
10348 end
= start
+ block_group
->key
.offset
- 1;
10350 * Hold the unused_bg_unpin_mutex lock to avoid racing with
10351 * btrfs_finish_extent_commit(). If we are at transaction N,
10352 * another task might be running finish_extent_commit() for the
10353 * previous transaction N - 1, and have seen a range belonging
10354 * to the block group in freed_extents[] before we were able to
10355 * clear the whole block group range from freed_extents[]. This
10356 * means that task can lookup for the block group after we
10357 * unpinned it from freed_extents[] and removed it, leading to
10358 * a BUG_ON() at btrfs_unpin_extent_range().
10360 mutex_lock(&fs_info
->unused_bg_unpin_mutex
);
10361 ret
= clear_extent_bits(&fs_info
->freed_extents
[0], start
, end
,
10362 EXTENT_DIRTY
, GFP_NOFS
);
10364 mutex_unlock(&fs_info
->unused_bg_unpin_mutex
);
10365 btrfs_dec_block_group_ro(root
, block_group
);
10368 ret
= clear_extent_bits(&fs_info
->freed_extents
[1], start
, end
,
10369 EXTENT_DIRTY
, GFP_NOFS
);
10371 mutex_unlock(&fs_info
->unused_bg_unpin_mutex
);
10372 btrfs_dec_block_group_ro(root
, block_group
);
10375 mutex_unlock(&fs_info
->unused_bg_unpin_mutex
);
10377 /* Reset pinned so btrfs_put_block_group doesn't complain */
10378 spin_lock(&space_info
->lock
);
10379 spin_lock(&block_group
->lock
);
10381 space_info
->bytes_pinned
-= block_group
->pinned
;
10382 space_info
->bytes_readonly
+= block_group
->pinned
;
10383 percpu_counter_add(&space_info
->total_bytes_pinned
,
10384 -block_group
->pinned
);
10385 block_group
->pinned
= 0;
10387 spin_unlock(&block_group
->lock
);
10388 spin_unlock(&space_info
->lock
);
10390 /* DISCARD can flip during remount */
10391 trimming
= btrfs_test_opt(root
, DISCARD
);
10393 /* Implicit trim during transaction commit. */
10395 btrfs_get_block_group_trimming(block_group
);
10398 * Btrfs_remove_chunk will abort the transaction if things go
10401 ret
= btrfs_remove_chunk(trans
, root
,
10402 block_group
->key
.objectid
);
10406 btrfs_put_block_group_trimming(block_group
);
10411 * If we're not mounted with -odiscard, we can just forget
10412 * about this block group. Otherwise we'll need to wait
10413 * until transaction commit to do the actual discard.
10416 WARN_ON(!list_empty(&block_group
->bg_list
));
10417 spin_lock(&trans
->transaction
->deleted_bgs_lock
);
10418 list_move(&block_group
->bg_list
,
10419 &trans
->transaction
->deleted_bgs
);
10420 spin_unlock(&trans
->transaction
->deleted_bgs_lock
);
10421 btrfs_get_block_group(block_group
);
10424 btrfs_end_transaction(trans
, root
);
10426 mutex_unlock(&fs_info
->delete_unused_bgs_mutex
);
10427 btrfs_put_block_group(block_group
);
10428 spin_lock(&fs_info
->unused_bgs_lock
);
10430 spin_unlock(&fs_info
->unused_bgs_lock
);
10433 int btrfs_init_space_info(struct btrfs_fs_info
*fs_info
)
10435 struct btrfs_space_info
*space_info
;
10436 struct btrfs_super_block
*disk_super
;
10442 disk_super
= fs_info
->super_copy
;
10443 if (!btrfs_super_root(disk_super
))
10446 features
= btrfs_super_incompat_flags(disk_super
);
10447 if (features
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
)
10450 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
10451 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
10456 flags
= BTRFS_BLOCK_GROUP_METADATA
| BTRFS_BLOCK_GROUP_DATA
;
10457 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
10459 flags
= BTRFS_BLOCK_GROUP_METADATA
;
10460 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
10464 flags
= BTRFS_BLOCK_GROUP_DATA
;
10465 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
10471 int btrfs_error_unpin_extent_range(struct btrfs_root
*root
, u64 start
, u64 end
)
10473 return unpin_extent_range(root
, start
, end
, false);
10477 * It used to be that old block groups would be left around forever.
10478 * Iterating over them would be enough to trim unused space. Since we
10479 * now automatically remove them, we also need to iterate over unallocated
10482 * We don't want a transaction for this since the discard may take a
10483 * substantial amount of time. We don't require that a transaction be
10484 * running, but we do need to take a running transaction into account
10485 * to ensure that we're not discarding chunks that were released in
10486 * the current transaction.
10488 * Holding the chunks lock will prevent other threads from allocating
10489 * or releasing chunks, but it won't prevent a running transaction
10490 * from committing and releasing the memory that the pending chunks
10491 * list head uses. For that, we need to take a reference to the
10494 static int btrfs_trim_free_extents(struct btrfs_device
*device
,
10495 u64 minlen
, u64
*trimmed
)
10497 u64 start
= 0, len
= 0;
10502 /* Not writeable = nothing to do. */
10503 if (!device
->writeable
)
10506 /* No free space = nothing to do. */
10507 if (device
->total_bytes
<= device
->bytes_used
)
10513 struct btrfs_fs_info
*fs_info
= device
->dev_root
->fs_info
;
10514 struct btrfs_transaction
*trans
;
10517 ret
= mutex_lock_interruptible(&fs_info
->chunk_mutex
);
10521 down_read(&fs_info
->commit_root_sem
);
10523 spin_lock(&fs_info
->trans_lock
);
10524 trans
= fs_info
->running_transaction
;
10526 atomic_inc(&trans
->use_count
);
10527 spin_unlock(&fs_info
->trans_lock
);
10529 ret
= find_free_dev_extent_start(trans
, device
, minlen
, start
,
10532 btrfs_put_transaction(trans
);
10535 up_read(&fs_info
->commit_root_sem
);
10536 mutex_unlock(&fs_info
->chunk_mutex
);
10537 if (ret
== -ENOSPC
)
10542 ret
= btrfs_issue_discard(device
->bdev
, start
, len
, &bytes
);
10543 up_read(&fs_info
->commit_root_sem
);
10544 mutex_unlock(&fs_info
->chunk_mutex
);
10552 if (fatal_signal_pending(current
)) {
10553 ret
= -ERESTARTSYS
;
10563 int btrfs_trim_fs(struct btrfs_root
*root
, struct fstrim_range
*range
)
10565 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
10566 struct btrfs_block_group_cache
*cache
= NULL
;
10567 struct btrfs_device
*device
;
10568 struct list_head
*devices
;
10573 u64 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
10577 * try to trim all FS space, our block group may start from non-zero.
10579 if (range
->len
== total_bytes
)
10580 cache
= btrfs_lookup_first_block_group(fs_info
, range
->start
);
10582 cache
= btrfs_lookup_block_group(fs_info
, range
->start
);
10585 if (cache
->key
.objectid
>= (range
->start
+ range
->len
)) {
10586 btrfs_put_block_group(cache
);
10590 start
= max(range
->start
, cache
->key
.objectid
);
10591 end
= min(range
->start
+ range
->len
,
10592 cache
->key
.objectid
+ cache
->key
.offset
);
10594 if (end
- start
>= range
->minlen
) {
10595 if (!block_group_cache_done(cache
)) {
10596 ret
= cache_block_group(cache
, 0);
10598 btrfs_put_block_group(cache
);
10601 ret
= wait_block_group_cache_done(cache
);
10603 btrfs_put_block_group(cache
);
10607 ret
= btrfs_trim_block_group(cache
,
10613 trimmed
+= group_trimmed
;
10615 btrfs_put_block_group(cache
);
10620 cache
= next_block_group(fs_info
->tree_root
, cache
);
10623 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
10624 devices
= &root
->fs_info
->fs_devices
->alloc_list
;
10625 list_for_each_entry(device
, devices
, dev_alloc_list
) {
10626 ret
= btrfs_trim_free_extents(device
, range
->minlen
,
10631 trimmed
+= group_trimmed
;
10633 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
10635 range
->len
= trimmed
;
10640 * btrfs_{start,end}_write_no_snapshoting() are similar to
10641 * mnt_{want,drop}_write(), they are used to prevent some tasks from writing
10642 * data into the page cache through nocow before the subvolume is snapshoted,
10643 * but flush the data into disk after the snapshot creation, or to prevent
10644 * operations while snapshoting is ongoing and that cause the snapshot to be
10645 * inconsistent (writes followed by expanding truncates for example).
10647 void btrfs_end_write_no_snapshoting(struct btrfs_root
*root
)
10649 percpu_counter_dec(&root
->subv_writers
->counter
);
10651 * Make sure counter is updated before we wake up waiters.
10654 if (waitqueue_active(&root
->subv_writers
->wait
))
10655 wake_up(&root
->subv_writers
->wait
);
10658 int btrfs_start_write_no_snapshoting(struct btrfs_root
*root
)
10660 if (atomic_read(&root
->will_be_snapshoted
))
10663 percpu_counter_inc(&root
->subv_writers
->counter
);
10665 * Make sure counter is updated before we check for snapshot creation.
10668 if (atomic_read(&root
->will_be_snapshoted
)) {
10669 btrfs_end_write_no_snapshoting(root
);