1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <linux/sched.h>
7 #include <linux/sched/signal.h>
8 #include <linux/pagemap.h>
9 #include <linux/writeback.h>
10 #include <linux/blkdev.h>
11 #include <linux/sort.h>
12 #include <linux/rcupdate.h>
13 #include <linux/kthread.h>
14 #include <linux/slab.h>
15 #include <linux/ratelimit.h>
16 #include <linux/percpu_counter.h>
17 #include <linux/lockdep.h>
18 #include <linux/crc32c.h>
21 #include "print-tree.h"
25 #include "free-space-cache.h"
26 #include "free-space-tree.h"
30 #include "ref-verify.h"
32 #undef SCRAMBLE_DELAYED_REFS
35 * control flags for do_chunk_alloc's force field
36 * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk
37 * if we really need one.
39 * CHUNK_ALLOC_LIMITED means to only try and allocate one
40 * if we have very few chunks already allocated. This is
41 * used as part of the clustering code to help make sure
42 * we have a good pool of storage to cluster in, without
43 * filling the FS with empty chunks
45 * CHUNK_ALLOC_FORCE means it must try to allocate one
49 CHUNK_ALLOC_NO_FORCE
= 0,
50 CHUNK_ALLOC_LIMITED
= 1,
51 CHUNK_ALLOC_FORCE
= 2,
55 * Declare a helper function to detect underflow of various space info members
57 #define DECLARE_SPACE_INFO_UPDATE(name) \
58 static inline void update_##name(struct btrfs_space_info *sinfo, \
61 if (bytes < 0 && sinfo->name < -bytes) { \
66 sinfo->name += bytes; \
69 DECLARE_SPACE_INFO_UPDATE(bytes_may_use
);
70 DECLARE_SPACE_INFO_UPDATE(bytes_pinned
);
72 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
73 struct btrfs_delayed_ref_node
*node
, u64 parent
,
74 u64 root_objectid
, u64 owner_objectid
,
75 u64 owner_offset
, int refs_to_drop
,
76 struct btrfs_delayed_extent_op
*extra_op
);
77 static void __run_delayed_extent_op(struct btrfs_delayed_extent_op
*extent_op
,
78 struct extent_buffer
*leaf
,
79 struct btrfs_extent_item
*ei
);
80 static int alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
81 u64 parent
, u64 root_objectid
,
82 u64 flags
, u64 owner
, u64 offset
,
83 struct btrfs_key
*ins
, int ref_mod
);
84 static int alloc_reserved_tree_block(struct btrfs_trans_handle
*trans
,
85 struct btrfs_delayed_ref_node
*node
,
86 struct btrfs_delayed_extent_op
*extent_op
);
87 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
, u64 flags
,
89 static int find_next_key(struct btrfs_path
*path
, int level
,
90 struct btrfs_key
*key
);
91 static void dump_space_info(struct btrfs_fs_info
*fs_info
,
92 struct btrfs_space_info
*info
, u64 bytes
,
93 int dump_block_groups
);
94 static int block_rsv_use_bytes(struct btrfs_block_rsv
*block_rsv
,
96 static void space_info_add_new_bytes(struct btrfs_fs_info
*fs_info
,
97 struct btrfs_space_info
*space_info
,
99 static void space_info_add_old_bytes(struct btrfs_fs_info
*fs_info
,
100 struct btrfs_space_info
*space_info
,
104 block_group_cache_done(struct btrfs_block_group_cache
*cache
)
107 return cache
->cached
== BTRFS_CACHE_FINISHED
||
108 cache
->cached
== BTRFS_CACHE_ERROR
;
111 static int block_group_bits(struct btrfs_block_group_cache
*cache
, u64 bits
)
113 return (cache
->flags
& bits
) == bits
;
116 void btrfs_get_block_group(struct btrfs_block_group_cache
*cache
)
118 atomic_inc(&cache
->count
);
121 void btrfs_put_block_group(struct btrfs_block_group_cache
*cache
)
123 if (atomic_dec_and_test(&cache
->count
)) {
124 WARN_ON(cache
->pinned
> 0);
125 WARN_ON(cache
->reserved
> 0);
128 * If not empty, someone is still holding mutex of
129 * full_stripe_lock, which can only be released by caller.
130 * And it will definitely cause use-after-free when caller
131 * tries to release full stripe lock.
133 * No better way to resolve, but only to warn.
135 WARN_ON(!RB_EMPTY_ROOT(&cache
->full_stripe_locks_root
.root
));
136 kfree(cache
->free_space_ctl
);
142 * this adds the block group to the fs_info rb tree for the block group
145 static int btrfs_add_block_group_cache(struct btrfs_fs_info
*info
,
146 struct btrfs_block_group_cache
*block_group
)
149 struct rb_node
*parent
= NULL
;
150 struct btrfs_block_group_cache
*cache
;
152 spin_lock(&info
->block_group_cache_lock
);
153 p
= &info
->block_group_cache_tree
.rb_node
;
157 cache
= rb_entry(parent
, struct btrfs_block_group_cache
,
159 if (block_group
->key
.objectid
< cache
->key
.objectid
) {
161 } else if (block_group
->key
.objectid
> cache
->key
.objectid
) {
164 spin_unlock(&info
->block_group_cache_lock
);
169 rb_link_node(&block_group
->cache_node
, parent
, p
);
170 rb_insert_color(&block_group
->cache_node
,
171 &info
->block_group_cache_tree
);
173 if (info
->first_logical_byte
> block_group
->key
.objectid
)
174 info
->first_logical_byte
= block_group
->key
.objectid
;
176 spin_unlock(&info
->block_group_cache_lock
);
182 * This will return the block group at or after bytenr if contains is 0, else
183 * it will return the block group that contains the bytenr
185 static struct btrfs_block_group_cache
*
186 block_group_cache_tree_search(struct btrfs_fs_info
*info
, u64 bytenr
,
189 struct btrfs_block_group_cache
*cache
, *ret
= NULL
;
193 spin_lock(&info
->block_group_cache_lock
);
194 n
= info
->block_group_cache_tree
.rb_node
;
197 cache
= rb_entry(n
, struct btrfs_block_group_cache
,
199 end
= cache
->key
.objectid
+ cache
->key
.offset
- 1;
200 start
= cache
->key
.objectid
;
202 if (bytenr
< start
) {
203 if (!contains
&& (!ret
|| start
< ret
->key
.objectid
))
206 } else if (bytenr
> start
) {
207 if (contains
&& bytenr
<= end
) {
218 btrfs_get_block_group(ret
);
219 if (bytenr
== 0 && info
->first_logical_byte
> ret
->key
.objectid
)
220 info
->first_logical_byte
= ret
->key
.objectid
;
222 spin_unlock(&info
->block_group_cache_lock
);
227 static int add_excluded_extent(struct btrfs_fs_info
*fs_info
,
228 u64 start
, u64 num_bytes
)
230 u64 end
= start
+ num_bytes
- 1;
231 set_extent_bits(&fs_info
->freed_extents
[0],
232 start
, end
, EXTENT_UPTODATE
);
233 set_extent_bits(&fs_info
->freed_extents
[1],
234 start
, end
, EXTENT_UPTODATE
);
238 static void free_excluded_extents(struct btrfs_block_group_cache
*cache
)
240 struct btrfs_fs_info
*fs_info
= cache
->fs_info
;
243 start
= cache
->key
.objectid
;
244 end
= start
+ cache
->key
.offset
- 1;
246 clear_extent_bits(&fs_info
->freed_extents
[0],
247 start
, end
, EXTENT_UPTODATE
);
248 clear_extent_bits(&fs_info
->freed_extents
[1],
249 start
, end
, EXTENT_UPTODATE
);
252 static int exclude_super_stripes(struct btrfs_block_group_cache
*cache
)
254 struct btrfs_fs_info
*fs_info
= cache
->fs_info
;
260 if (cache
->key
.objectid
< BTRFS_SUPER_INFO_OFFSET
) {
261 stripe_len
= BTRFS_SUPER_INFO_OFFSET
- cache
->key
.objectid
;
262 cache
->bytes_super
+= stripe_len
;
263 ret
= add_excluded_extent(fs_info
, cache
->key
.objectid
,
269 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
270 bytenr
= btrfs_sb_offset(i
);
271 ret
= btrfs_rmap_block(fs_info
, cache
->key
.objectid
,
272 bytenr
, &logical
, &nr
, &stripe_len
);
279 if (logical
[nr
] > cache
->key
.objectid
+
283 if (logical
[nr
] + stripe_len
<= cache
->key
.objectid
)
287 if (start
< cache
->key
.objectid
) {
288 start
= cache
->key
.objectid
;
289 len
= (logical
[nr
] + stripe_len
) - start
;
291 len
= min_t(u64
, stripe_len
,
292 cache
->key
.objectid
+
293 cache
->key
.offset
- start
);
296 cache
->bytes_super
+= len
;
297 ret
= add_excluded_extent(fs_info
, start
, len
);
309 static struct btrfs_caching_control
*
310 get_caching_control(struct btrfs_block_group_cache
*cache
)
312 struct btrfs_caching_control
*ctl
;
314 spin_lock(&cache
->lock
);
315 if (!cache
->caching_ctl
) {
316 spin_unlock(&cache
->lock
);
320 ctl
= cache
->caching_ctl
;
321 refcount_inc(&ctl
->count
);
322 spin_unlock(&cache
->lock
);
326 static void put_caching_control(struct btrfs_caching_control
*ctl
)
328 if (refcount_dec_and_test(&ctl
->count
))
332 #ifdef CONFIG_BTRFS_DEBUG
333 static void fragment_free_space(struct btrfs_block_group_cache
*block_group
)
335 struct btrfs_fs_info
*fs_info
= block_group
->fs_info
;
336 u64 start
= block_group
->key
.objectid
;
337 u64 len
= block_group
->key
.offset
;
338 u64 chunk
= block_group
->flags
& BTRFS_BLOCK_GROUP_METADATA
?
339 fs_info
->nodesize
: fs_info
->sectorsize
;
340 u64 step
= chunk
<< 1;
342 while (len
> chunk
) {
343 btrfs_remove_free_space(block_group
, start
, chunk
);
354 * this is only called by cache_block_group, since we could have freed extents
355 * we need to check the pinned_extents for any extents that can't be used yet
356 * since their free space will be released as soon as the transaction commits.
358 u64
add_new_free_space(struct btrfs_block_group_cache
*block_group
,
361 struct btrfs_fs_info
*info
= block_group
->fs_info
;
362 u64 extent_start
, extent_end
, size
, total_added
= 0;
365 while (start
< end
) {
366 ret
= find_first_extent_bit(info
->pinned_extents
, start
,
367 &extent_start
, &extent_end
,
368 EXTENT_DIRTY
| EXTENT_UPTODATE
,
373 if (extent_start
<= start
) {
374 start
= extent_end
+ 1;
375 } else if (extent_start
> start
&& extent_start
< end
) {
376 size
= extent_start
- start
;
378 ret
= btrfs_add_free_space(block_group
, start
,
380 BUG_ON(ret
); /* -ENOMEM or logic error */
381 start
= extent_end
+ 1;
390 ret
= btrfs_add_free_space(block_group
, start
, size
);
391 BUG_ON(ret
); /* -ENOMEM or logic error */
397 static int load_extent_tree_free(struct btrfs_caching_control
*caching_ctl
)
399 struct btrfs_block_group_cache
*block_group
= caching_ctl
->block_group
;
400 struct btrfs_fs_info
*fs_info
= block_group
->fs_info
;
401 struct btrfs_root
*extent_root
= fs_info
->extent_root
;
402 struct btrfs_path
*path
;
403 struct extent_buffer
*leaf
;
404 struct btrfs_key key
;
411 path
= btrfs_alloc_path();
415 last
= max_t(u64
, block_group
->key
.objectid
, BTRFS_SUPER_INFO_OFFSET
);
417 #ifdef CONFIG_BTRFS_DEBUG
419 * If we're fragmenting we don't want to make anybody think we can
420 * allocate from this block group until we've had a chance to fragment
423 if (btrfs_should_fragment_free_space(block_group
))
427 * We don't want to deadlock with somebody trying to allocate a new
428 * extent for the extent root while also trying to search the extent
429 * root to add free space. So we skip locking and search the commit
430 * root, since its read-only
432 path
->skip_locking
= 1;
433 path
->search_commit_root
= 1;
434 path
->reada
= READA_FORWARD
;
438 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
441 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
445 leaf
= path
->nodes
[0];
446 nritems
= btrfs_header_nritems(leaf
);
449 if (btrfs_fs_closing(fs_info
) > 1) {
454 if (path
->slots
[0] < nritems
) {
455 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
457 ret
= find_next_key(path
, 0, &key
);
461 if (need_resched() ||
462 rwsem_is_contended(&fs_info
->commit_root_sem
)) {
464 caching_ctl
->progress
= last
;
465 btrfs_release_path(path
);
466 up_read(&fs_info
->commit_root_sem
);
467 mutex_unlock(&caching_ctl
->mutex
);
469 mutex_lock(&caching_ctl
->mutex
);
470 down_read(&fs_info
->commit_root_sem
);
474 ret
= btrfs_next_leaf(extent_root
, path
);
479 leaf
= path
->nodes
[0];
480 nritems
= btrfs_header_nritems(leaf
);
484 if (key
.objectid
< last
) {
487 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
490 caching_ctl
->progress
= last
;
491 btrfs_release_path(path
);
495 if (key
.objectid
< block_group
->key
.objectid
) {
500 if (key
.objectid
>= block_group
->key
.objectid
+
501 block_group
->key
.offset
)
504 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
||
505 key
.type
== BTRFS_METADATA_ITEM_KEY
) {
506 total_found
+= add_new_free_space(block_group
, last
,
508 if (key
.type
== BTRFS_METADATA_ITEM_KEY
)
509 last
= key
.objectid
+
512 last
= key
.objectid
+ key
.offset
;
514 if (total_found
> CACHING_CTL_WAKE_UP
) {
517 wake_up(&caching_ctl
->wait
);
524 total_found
+= add_new_free_space(block_group
, last
,
525 block_group
->key
.objectid
+
526 block_group
->key
.offset
);
527 caching_ctl
->progress
= (u64
)-1;
530 btrfs_free_path(path
);
534 static noinline
void caching_thread(struct btrfs_work
*work
)
536 struct btrfs_block_group_cache
*block_group
;
537 struct btrfs_fs_info
*fs_info
;
538 struct btrfs_caching_control
*caching_ctl
;
541 caching_ctl
= container_of(work
, struct btrfs_caching_control
, work
);
542 block_group
= caching_ctl
->block_group
;
543 fs_info
= block_group
->fs_info
;
545 mutex_lock(&caching_ctl
->mutex
);
546 down_read(&fs_info
->commit_root_sem
);
548 if (btrfs_fs_compat_ro(fs_info
, FREE_SPACE_TREE
))
549 ret
= load_free_space_tree(caching_ctl
);
551 ret
= load_extent_tree_free(caching_ctl
);
553 spin_lock(&block_group
->lock
);
554 block_group
->caching_ctl
= NULL
;
555 block_group
->cached
= ret
? BTRFS_CACHE_ERROR
: BTRFS_CACHE_FINISHED
;
556 spin_unlock(&block_group
->lock
);
558 #ifdef CONFIG_BTRFS_DEBUG
559 if (btrfs_should_fragment_free_space(block_group
)) {
562 spin_lock(&block_group
->space_info
->lock
);
563 spin_lock(&block_group
->lock
);
564 bytes_used
= block_group
->key
.offset
-
565 btrfs_block_group_used(&block_group
->item
);
566 block_group
->space_info
->bytes_used
+= bytes_used
>> 1;
567 spin_unlock(&block_group
->lock
);
568 spin_unlock(&block_group
->space_info
->lock
);
569 fragment_free_space(block_group
);
573 caching_ctl
->progress
= (u64
)-1;
575 up_read(&fs_info
->commit_root_sem
);
576 free_excluded_extents(block_group
);
577 mutex_unlock(&caching_ctl
->mutex
);
579 wake_up(&caching_ctl
->wait
);
581 put_caching_control(caching_ctl
);
582 btrfs_put_block_group(block_group
);
585 static int cache_block_group(struct btrfs_block_group_cache
*cache
,
589 struct btrfs_fs_info
*fs_info
= cache
->fs_info
;
590 struct btrfs_caching_control
*caching_ctl
;
593 caching_ctl
= kzalloc(sizeof(*caching_ctl
), GFP_NOFS
);
597 INIT_LIST_HEAD(&caching_ctl
->list
);
598 mutex_init(&caching_ctl
->mutex
);
599 init_waitqueue_head(&caching_ctl
->wait
);
600 caching_ctl
->block_group
= cache
;
601 caching_ctl
->progress
= cache
->key
.objectid
;
602 refcount_set(&caching_ctl
->count
, 1);
603 btrfs_init_work(&caching_ctl
->work
, btrfs_cache_helper
,
604 caching_thread
, NULL
, NULL
);
606 spin_lock(&cache
->lock
);
608 * This should be a rare occasion, but this could happen I think in the
609 * case where one thread starts to load the space cache info, and then
610 * some other thread starts a transaction commit which tries to do an
611 * allocation while the other thread is still loading the space cache
612 * info. The previous loop should have kept us from choosing this block
613 * group, but if we've moved to the state where we will wait on caching
614 * block groups we need to first check if we're doing a fast load here,
615 * so we can wait for it to finish, otherwise we could end up allocating
616 * from a block group who's cache gets evicted for one reason or
619 while (cache
->cached
== BTRFS_CACHE_FAST
) {
620 struct btrfs_caching_control
*ctl
;
622 ctl
= cache
->caching_ctl
;
623 refcount_inc(&ctl
->count
);
624 prepare_to_wait(&ctl
->wait
, &wait
, TASK_UNINTERRUPTIBLE
);
625 spin_unlock(&cache
->lock
);
629 finish_wait(&ctl
->wait
, &wait
);
630 put_caching_control(ctl
);
631 spin_lock(&cache
->lock
);
634 if (cache
->cached
!= BTRFS_CACHE_NO
) {
635 spin_unlock(&cache
->lock
);
639 WARN_ON(cache
->caching_ctl
);
640 cache
->caching_ctl
= caching_ctl
;
641 cache
->cached
= BTRFS_CACHE_FAST
;
642 spin_unlock(&cache
->lock
);
644 if (btrfs_test_opt(fs_info
, SPACE_CACHE
)) {
645 mutex_lock(&caching_ctl
->mutex
);
646 ret
= load_free_space_cache(fs_info
, cache
);
648 spin_lock(&cache
->lock
);
650 cache
->caching_ctl
= NULL
;
651 cache
->cached
= BTRFS_CACHE_FINISHED
;
652 cache
->last_byte_to_unpin
= (u64
)-1;
653 caching_ctl
->progress
= (u64
)-1;
655 if (load_cache_only
) {
656 cache
->caching_ctl
= NULL
;
657 cache
->cached
= BTRFS_CACHE_NO
;
659 cache
->cached
= BTRFS_CACHE_STARTED
;
660 cache
->has_caching_ctl
= 1;
663 spin_unlock(&cache
->lock
);
664 #ifdef CONFIG_BTRFS_DEBUG
666 btrfs_should_fragment_free_space(cache
)) {
669 spin_lock(&cache
->space_info
->lock
);
670 spin_lock(&cache
->lock
);
671 bytes_used
= cache
->key
.offset
-
672 btrfs_block_group_used(&cache
->item
);
673 cache
->space_info
->bytes_used
+= bytes_used
>> 1;
674 spin_unlock(&cache
->lock
);
675 spin_unlock(&cache
->space_info
->lock
);
676 fragment_free_space(cache
);
679 mutex_unlock(&caching_ctl
->mutex
);
681 wake_up(&caching_ctl
->wait
);
683 put_caching_control(caching_ctl
);
684 free_excluded_extents(cache
);
689 * We're either using the free space tree or no caching at all.
690 * Set cached to the appropriate value and wakeup any waiters.
692 spin_lock(&cache
->lock
);
693 if (load_cache_only
) {
694 cache
->caching_ctl
= NULL
;
695 cache
->cached
= BTRFS_CACHE_NO
;
697 cache
->cached
= BTRFS_CACHE_STARTED
;
698 cache
->has_caching_ctl
= 1;
700 spin_unlock(&cache
->lock
);
701 wake_up(&caching_ctl
->wait
);
704 if (load_cache_only
) {
705 put_caching_control(caching_ctl
);
709 down_write(&fs_info
->commit_root_sem
);
710 refcount_inc(&caching_ctl
->count
);
711 list_add_tail(&caching_ctl
->list
, &fs_info
->caching_block_groups
);
712 up_write(&fs_info
->commit_root_sem
);
714 btrfs_get_block_group(cache
);
716 btrfs_queue_work(fs_info
->caching_workers
, &caching_ctl
->work
);
722 * return the block group that starts at or after bytenr
724 static struct btrfs_block_group_cache
*
725 btrfs_lookup_first_block_group(struct btrfs_fs_info
*info
, u64 bytenr
)
727 return block_group_cache_tree_search(info
, bytenr
, 0);
731 * return the block group that contains the given bytenr
733 struct btrfs_block_group_cache
*btrfs_lookup_block_group(
734 struct btrfs_fs_info
*info
,
737 return block_group_cache_tree_search(info
, bytenr
, 1);
740 static struct btrfs_space_info
*__find_space_info(struct btrfs_fs_info
*info
,
743 struct list_head
*head
= &info
->space_info
;
744 struct btrfs_space_info
*found
;
746 flags
&= BTRFS_BLOCK_GROUP_TYPE_MASK
;
749 list_for_each_entry_rcu(found
, head
, list
) {
750 if (found
->flags
& flags
) {
759 static void add_pinned_bytes(struct btrfs_fs_info
*fs_info
, s64 num_bytes
,
760 bool metadata
, u64 root_objectid
)
762 struct btrfs_space_info
*space_info
;
766 if (root_objectid
== BTRFS_CHUNK_TREE_OBJECTID
)
767 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
769 flags
= BTRFS_BLOCK_GROUP_METADATA
;
771 flags
= BTRFS_BLOCK_GROUP_DATA
;
774 space_info
= __find_space_info(fs_info
, flags
);
776 percpu_counter_add_batch(&space_info
->total_bytes_pinned
, num_bytes
,
777 BTRFS_TOTAL_BYTES_PINNED_BATCH
);
781 * after adding space to the filesystem, we need to clear the full flags
782 * on all the space infos.
784 void btrfs_clear_space_info_full(struct btrfs_fs_info
*info
)
786 struct list_head
*head
= &info
->space_info
;
787 struct btrfs_space_info
*found
;
790 list_for_each_entry_rcu(found
, head
, list
)
795 /* simple helper to search for an existing data extent at a given offset */
796 int btrfs_lookup_data_extent(struct btrfs_fs_info
*fs_info
, u64 start
, u64 len
)
799 struct btrfs_key key
;
800 struct btrfs_path
*path
;
802 path
= btrfs_alloc_path();
806 key
.objectid
= start
;
808 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
809 ret
= btrfs_search_slot(NULL
, fs_info
->extent_root
, &key
, path
, 0, 0);
810 btrfs_free_path(path
);
815 * helper function to lookup reference count and flags of a tree block.
817 * the head node for delayed ref is used to store the sum of all the
818 * reference count modifications queued up in the rbtree. the head
819 * node may also store the extent flags to set. This way you can check
820 * to see what the reference count and extent flags would be if all of
821 * the delayed refs are not processed.
823 int btrfs_lookup_extent_info(struct btrfs_trans_handle
*trans
,
824 struct btrfs_fs_info
*fs_info
, u64 bytenr
,
825 u64 offset
, int metadata
, u64
*refs
, u64
*flags
)
827 struct btrfs_delayed_ref_head
*head
;
828 struct btrfs_delayed_ref_root
*delayed_refs
;
829 struct btrfs_path
*path
;
830 struct btrfs_extent_item
*ei
;
831 struct extent_buffer
*leaf
;
832 struct btrfs_key key
;
839 * If we don't have skinny metadata, don't bother doing anything
842 if (metadata
&& !btrfs_fs_incompat(fs_info
, SKINNY_METADATA
)) {
843 offset
= fs_info
->nodesize
;
847 path
= btrfs_alloc_path();
852 path
->skip_locking
= 1;
853 path
->search_commit_root
= 1;
857 key
.objectid
= bytenr
;
860 key
.type
= BTRFS_METADATA_ITEM_KEY
;
862 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
864 ret
= btrfs_search_slot(trans
, fs_info
->extent_root
, &key
, path
, 0, 0);
868 if (ret
> 0 && metadata
&& key
.type
== BTRFS_METADATA_ITEM_KEY
) {
869 if (path
->slots
[0]) {
871 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
873 if (key
.objectid
== bytenr
&&
874 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
875 key
.offset
== fs_info
->nodesize
)
881 leaf
= path
->nodes
[0];
882 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
883 if (item_size
>= sizeof(*ei
)) {
884 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
885 struct btrfs_extent_item
);
886 num_refs
= btrfs_extent_refs(leaf
, ei
);
887 extent_flags
= btrfs_extent_flags(leaf
, ei
);
890 btrfs_print_v0_err(fs_info
);
892 btrfs_abort_transaction(trans
, ret
);
894 btrfs_handle_fs_error(fs_info
, ret
, NULL
);
899 BUG_ON(num_refs
== 0);
909 delayed_refs
= &trans
->transaction
->delayed_refs
;
910 spin_lock(&delayed_refs
->lock
);
911 head
= btrfs_find_delayed_ref_head(delayed_refs
, bytenr
);
913 if (!mutex_trylock(&head
->mutex
)) {
914 refcount_inc(&head
->refs
);
915 spin_unlock(&delayed_refs
->lock
);
917 btrfs_release_path(path
);
920 * Mutex was contended, block until it's released and try
923 mutex_lock(&head
->mutex
);
924 mutex_unlock(&head
->mutex
);
925 btrfs_put_delayed_ref_head(head
);
928 spin_lock(&head
->lock
);
929 if (head
->extent_op
&& head
->extent_op
->update_flags
)
930 extent_flags
|= head
->extent_op
->flags_to_set
;
932 BUG_ON(num_refs
== 0);
934 num_refs
+= head
->ref_mod
;
935 spin_unlock(&head
->lock
);
936 mutex_unlock(&head
->mutex
);
938 spin_unlock(&delayed_refs
->lock
);
940 WARN_ON(num_refs
== 0);
944 *flags
= extent_flags
;
946 btrfs_free_path(path
);
951 * Back reference rules. Back refs have three main goals:
953 * 1) differentiate between all holders of references to an extent so that
954 * when a reference is dropped we can make sure it was a valid reference
955 * before freeing the extent.
957 * 2) Provide enough information to quickly find the holders of an extent
958 * if we notice a given block is corrupted or bad.
960 * 3) Make it easy to migrate blocks for FS shrinking or storage pool
961 * maintenance. This is actually the same as #2, but with a slightly
962 * different use case.
964 * There are two kinds of back refs. The implicit back refs is optimized
965 * for pointers in non-shared tree blocks. For a given pointer in a block,
966 * back refs of this kind provide information about the block's owner tree
967 * and the pointer's key. These information allow us to find the block by
968 * b-tree searching. The full back refs is for pointers in tree blocks not
969 * referenced by their owner trees. The location of tree block is recorded
970 * in the back refs. Actually the full back refs is generic, and can be
971 * used in all cases the implicit back refs is used. The major shortcoming
972 * of the full back refs is its overhead. Every time a tree block gets
973 * COWed, we have to update back refs entry for all pointers in it.
975 * For a newly allocated tree block, we use implicit back refs for
976 * pointers in it. This means most tree related operations only involve
977 * implicit back refs. For a tree block created in old transaction, the
978 * only way to drop a reference to it is COW it. So we can detect the
979 * event that tree block loses its owner tree's reference and do the
980 * back refs conversion.
982 * When a tree block is COWed through a tree, there are four cases:
984 * The reference count of the block is one and the tree is the block's
985 * owner tree. Nothing to do in this case.
987 * The reference count of the block is one and the tree is not the
988 * block's owner tree. In this case, full back refs is used for pointers
989 * in the block. Remove these full back refs, add implicit back refs for
990 * every pointers in the new block.
992 * The reference count of the block is greater than one and the tree is
993 * the block's owner tree. In this case, implicit back refs is used for
994 * pointers in the block. Add full back refs for every pointers in the
995 * block, increase lower level extents' reference counts. The original
996 * implicit back refs are entailed to the new block.
998 * The reference count of the block is greater than one and the tree is
999 * not the block's owner tree. Add implicit back refs for every pointer in
1000 * the new block, increase lower level extents' reference count.
1002 * Back Reference Key composing:
1004 * The key objectid corresponds to the first byte in the extent,
1005 * The key type is used to differentiate between types of back refs.
1006 * There are different meanings of the key offset for different types
1009 * File extents can be referenced by:
1011 * - multiple snapshots, subvolumes, or different generations in one subvol
1012 * - different files inside a single subvolume
1013 * - different offsets inside a file (bookend extents in file.c)
1015 * The extent ref structure for the implicit back refs has fields for:
1017 * - Objectid of the subvolume root
1018 * - objectid of the file holding the reference
1019 * - original offset in the file
1020 * - how many bookend extents
1022 * The key offset for the implicit back refs is hash of the first
1025 * The extent ref structure for the full back refs has field for:
1027 * - number of pointers in the tree leaf
1029 * The key offset for the implicit back refs is the first byte of
1032 * When a file extent is allocated, The implicit back refs is used.
1033 * the fields are filled in:
1035 * (root_key.objectid, inode objectid, offset in file, 1)
1037 * When a file extent is removed file truncation, we find the
1038 * corresponding implicit back refs and check the following fields:
1040 * (btrfs_header_owner(leaf), inode objectid, offset in file)
1042 * Btree extents can be referenced by:
1044 * - Different subvolumes
1046 * Both the implicit back refs and the full back refs for tree blocks
1047 * only consist of key. The key offset for the implicit back refs is
1048 * objectid of block's owner tree. The key offset for the full back refs
1049 * is the first byte of parent block.
1051 * When implicit back refs is used, information about the lowest key and
1052 * level of the tree block are required. These information are stored in
1053 * tree block info structure.
1057 * is_data == BTRFS_REF_TYPE_BLOCK, tree block type is required,
1058 * is_data == BTRFS_REF_TYPE_DATA, data type is requiried,
1059 * is_data == BTRFS_REF_TYPE_ANY, either type is OK.
1061 int btrfs_get_extent_inline_ref_type(const struct extent_buffer
*eb
,
1062 struct btrfs_extent_inline_ref
*iref
,
1063 enum btrfs_inline_ref_type is_data
)
1065 int type
= btrfs_extent_inline_ref_type(eb
, iref
);
1066 u64 offset
= btrfs_extent_inline_ref_offset(eb
, iref
);
1068 if (type
== BTRFS_TREE_BLOCK_REF_KEY
||
1069 type
== BTRFS_SHARED_BLOCK_REF_KEY
||
1070 type
== BTRFS_SHARED_DATA_REF_KEY
||
1071 type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1072 if (is_data
== BTRFS_REF_TYPE_BLOCK
) {
1073 if (type
== BTRFS_TREE_BLOCK_REF_KEY
)
1075 if (type
== BTRFS_SHARED_BLOCK_REF_KEY
) {
1076 ASSERT(eb
->fs_info
);
1078 * Every shared one has parent tree
1079 * block, which must be aligned to
1083 IS_ALIGNED(offset
, eb
->fs_info
->nodesize
))
1086 } else if (is_data
== BTRFS_REF_TYPE_DATA
) {
1087 if (type
== BTRFS_EXTENT_DATA_REF_KEY
)
1089 if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1090 ASSERT(eb
->fs_info
);
1092 * Every shared one has parent tree
1093 * block, which must be aligned to
1097 IS_ALIGNED(offset
, eb
->fs_info
->nodesize
))
1101 ASSERT(is_data
== BTRFS_REF_TYPE_ANY
);
1106 btrfs_print_leaf((struct extent_buffer
*)eb
);
1107 btrfs_err(eb
->fs_info
, "eb %llu invalid extent inline ref type %d",
1111 return BTRFS_REF_TYPE_INVALID
;
1114 static u64
hash_extent_data_ref(u64 root_objectid
, u64 owner
, u64 offset
)
1116 u32 high_crc
= ~(u32
)0;
1117 u32 low_crc
= ~(u32
)0;
1120 lenum
= cpu_to_le64(root_objectid
);
1121 high_crc
= crc32c(high_crc
, &lenum
, sizeof(lenum
));
1122 lenum
= cpu_to_le64(owner
);
1123 low_crc
= crc32c(low_crc
, &lenum
, sizeof(lenum
));
1124 lenum
= cpu_to_le64(offset
);
1125 low_crc
= crc32c(low_crc
, &lenum
, sizeof(lenum
));
1127 return ((u64
)high_crc
<< 31) ^ (u64
)low_crc
;
1130 static u64
hash_extent_data_ref_item(struct extent_buffer
*leaf
,
1131 struct btrfs_extent_data_ref
*ref
)
1133 return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf
, ref
),
1134 btrfs_extent_data_ref_objectid(leaf
, ref
),
1135 btrfs_extent_data_ref_offset(leaf
, ref
));
1138 static int match_extent_data_ref(struct extent_buffer
*leaf
,
1139 struct btrfs_extent_data_ref
*ref
,
1140 u64 root_objectid
, u64 owner
, u64 offset
)
1142 if (btrfs_extent_data_ref_root(leaf
, ref
) != root_objectid
||
1143 btrfs_extent_data_ref_objectid(leaf
, ref
) != owner
||
1144 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
1149 static noinline
int lookup_extent_data_ref(struct btrfs_trans_handle
*trans
,
1150 struct btrfs_path
*path
,
1151 u64 bytenr
, u64 parent
,
1153 u64 owner
, u64 offset
)
1155 struct btrfs_root
*root
= trans
->fs_info
->extent_root
;
1156 struct btrfs_key key
;
1157 struct btrfs_extent_data_ref
*ref
;
1158 struct extent_buffer
*leaf
;
1164 key
.objectid
= bytenr
;
1166 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1167 key
.offset
= parent
;
1169 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1170 key
.offset
= hash_extent_data_ref(root_objectid
,
1175 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1187 leaf
= path
->nodes
[0];
1188 nritems
= btrfs_header_nritems(leaf
);
1190 if (path
->slots
[0] >= nritems
) {
1191 ret
= btrfs_next_leaf(root
, path
);
1197 leaf
= path
->nodes
[0];
1198 nritems
= btrfs_header_nritems(leaf
);
1202 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1203 if (key
.objectid
!= bytenr
||
1204 key
.type
!= BTRFS_EXTENT_DATA_REF_KEY
)
1207 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1208 struct btrfs_extent_data_ref
);
1210 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1213 btrfs_release_path(path
);
1225 static noinline
int insert_extent_data_ref(struct btrfs_trans_handle
*trans
,
1226 struct btrfs_path
*path
,
1227 u64 bytenr
, u64 parent
,
1228 u64 root_objectid
, u64 owner
,
1229 u64 offset
, int refs_to_add
)
1231 struct btrfs_root
*root
= trans
->fs_info
->extent_root
;
1232 struct btrfs_key key
;
1233 struct extent_buffer
*leaf
;
1238 key
.objectid
= bytenr
;
1240 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1241 key
.offset
= parent
;
1242 size
= sizeof(struct btrfs_shared_data_ref
);
1244 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1245 key
.offset
= hash_extent_data_ref(root_objectid
,
1247 size
= sizeof(struct btrfs_extent_data_ref
);
1250 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, size
);
1251 if (ret
&& ret
!= -EEXIST
)
1254 leaf
= path
->nodes
[0];
1256 struct btrfs_shared_data_ref
*ref
;
1257 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1258 struct btrfs_shared_data_ref
);
1260 btrfs_set_shared_data_ref_count(leaf
, ref
, refs_to_add
);
1262 num_refs
= btrfs_shared_data_ref_count(leaf
, ref
);
1263 num_refs
+= refs_to_add
;
1264 btrfs_set_shared_data_ref_count(leaf
, ref
, num_refs
);
1267 struct btrfs_extent_data_ref
*ref
;
1268 while (ret
== -EEXIST
) {
1269 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1270 struct btrfs_extent_data_ref
);
1271 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1274 btrfs_release_path(path
);
1276 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
1278 if (ret
&& ret
!= -EEXIST
)
1281 leaf
= path
->nodes
[0];
1283 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1284 struct btrfs_extent_data_ref
);
1286 btrfs_set_extent_data_ref_root(leaf
, ref
,
1288 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
1289 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
1290 btrfs_set_extent_data_ref_count(leaf
, ref
, refs_to_add
);
1292 num_refs
= btrfs_extent_data_ref_count(leaf
, ref
);
1293 num_refs
+= refs_to_add
;
1294 btrfs_set_extent_data_ref_count(leaf
, ref
, num_refs
);
1297 btrfs_mark_buffer_dirty(leaf
);
1300 btrfs_release_path(path
);
1304 static noinline
int remove_extent_data_ref(struct btrfs_trans_handle
*trans
,
1305 struct btrfs_path
*path
,
1306 int refs_to_drop
, int *last_ref
)
1308 struct btrfs_key key
;
1309 struct btrfs_extent_data_ref
*ref1
= NULL
;
1310 struct btrfs_shared_data_ref
*ref2
= NULL
;
1311 struct extent_buffer
*leaf
;
1315 leaf
= path
->nodes
[0];
1316 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1318 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1319 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1320 struct btrfs_extent_data_ref
);
1321 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1322 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1323 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1324 struct btrfs_shared_data_ref
);
1325 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1326 } else if (unlikely(key
.type
== BTRFS_EXTENT_REF_V0_KEY
)) {
1327 btrfs_print_v0_err(trans
->fs_info
);
1328 btrfs_abort_transaction(trans
, -EINVAL
);
1334 BUG_ON(num_refs
< refs_to_drop
);
1335 num_refs
-= refs_to_drop
;
1337 if (num_refs
== 0) {
1338 ret
= btrfs_del_item(trans
, trans
->fs_info
->extent_root
, path
);
1341 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
)
1342 btrfs_set_extent_data_ref_count(leaf
, ref1
, num_refs
);
1343 else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
)
1344 btrfs_set_shared_data_ref_count(leaf
, ref2
, num_refs
);
1345 btrfs_mark_buffer_dirty(leaf
);
1350 static noinline u32
extent_data_ref_count(struct btrfs_path
*path
,
1351 struct btrfs_extent_inline_ref
*iref
)
1353 struct btrfs_key key
;
1354 struct extent_buffer
*leaf
;
1355 struct btrfs_extent_data_ref
*ref1
;
1356 struct btrfs_shared_data_ref
*ref2
;
1360 leaf
= path
->nodes
[0];
1361 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1363 BUG_ON(key
.type
== BTRFS_EXTENT_REF_V0_KEY
);
1366 * If type is invalid, we should have bailed out earlier than
1369 type
= btrfs_get_extent_inline_ref_type(leaf
, iref
, BTRFS_REF_TYPE_DATA
);
1370 ASSERT(type
!= BTRFS_REF_TYPE_INVALID
);
1371 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1372 ref1
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1373 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1375 ref2
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1376 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1378 } else if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1379 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1380 struct btrfs_extent_data_ref
);
1381 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1382 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1383 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1384 struct btrfs_shared_data_ref
);
1385 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1392 static noinline
int lookup_tree_block_ref(struct btrfs_trans_handle
*trans
,
1393 struct btrfs_path
*path
,
1394 u64 bytenr
, u64 parent
,
1397 struct btrfs_root
*root
= trans
->fs_info
->extent_root
;
1398 struct btrfs_key key
;
1401 key
.objectid
= bytenr
;
1403 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1404 key
.offset
= parent
;
1406 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1407 key
.offset
= root_objectid
;
1410 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1416 static noinline
int insert_tree_block_ref(struct btrfs_trans_handle
*trans
,
1417 struct btrfs_path
*path
,
1418 u64 bytenr
, u64 parent
,
1421 struct btrfs_key key
;
1424 key
.objectid
= bytenr
;
1426 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1427 key
.offset
= parent
;
1429 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1430 key
.offset
= root_objectid
;
1433 ret
= btrfs_insert_empty_item(trans
, trans
->fs_info
->extent_root
,
1435 btrfs_release_path(path
);
1439 static inline int extent_ref_type(u64 parent
, u64 owner
)
1442 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1444 type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1446 type
= BTRFS_TREE_BLOCK_REF_KEY
;
1449 type
= BTRFS_SHARED_DATA_REF_KEY
;
1451 type
= BTRFS_EXTENT_DATA_REF_KEY
;
1456 static int find_next_key(struct btrfs_path
*path
, int level
,
1457 struct btrfs_key
*key
)
1460 for (; level
< BTRFS_MAX_LEVEL
; level
++) {
1461 if (!path
->nodes
[level
])
1463 if (path
->slots
[level
] + 1 >=
1464 btrfs_header_nritems(path
->nodes
[level
]))
1467 btrfs_item_key_to_cpu(path
->nodes
[level
], key
,
1468 path
->slots
[level
] + 1);
1470 btrfs_node_key_to_cpu(path
->nodes
[level
], key
,
1471 path
->slots
[level
] + 1);
1478 * look for inline back ref. if back ref is found, *ref_ret is set
1479 * to the address of inline back ref, and 0 is returned.
1481 * if back ref isn't found, *ref_ret is set to the address where it
1482 * should be inserted, and -ENOENT is returned.
1484 * if insert is true and there are too many inline back refs, the path
1485 * points to the extent item, and -EAGAIN is returned.
1487 * NOTE: inline back refs are ordered in the same way that back ref
1488 * items in the tree are ordered.
1490 static noinline_for_stack
1491 int lookup_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1492 struct btrfs_path
*path
,
1493 struct btrfs_extent_inline_ref
**ref_ret
,
1494 u64 bytenr
, u64 num_bytes
,
1495 u64 parent
, u64 root_objectid
,
1496 u64 owner
, u64 offset
, int insert
)
1498 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
1499 struct btrfs_root
*root
= fs_info
->extent_root
;
1500 struct btrfs_key key
;
1501 struct extent_buffer
*leaf
;
1502 struct btrfs_extent_item
*ei
;
1503 struct btrfs_extent_inline_ref
*iref
;
1513 bool skinny_metadata
= btrfs_fs_incompat(fs_info
, SKINNY_METADATA
);
1516 key
.objectid
= bytenr
;
1517 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1518 key
.offset
= num_bytes
;
1520 want
= extent_ref_type(parent
, owner
);
1522 extra_size
= btrfs_extent_inline_ref_size(want
);
1523 path
->keep_locks
= 1;
1528 * Owner is our level, so we can just add one to get the level for the
1529 * block we are interested in.
1531 if (skinny_metadata
&& owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1532 key
.type
= BTRFS_METADATA_ITEM_KEY
;
1537 ret
= btrfs_search_slot(trans
, root
, &key
, path
, extra_size
, 1);
1544 * We may be a newly converted file system which still has the old fat
1545 * extent entries for metadata, so try and see if we have one of those.
1547 if (ret
> 0 && skinny_metadata
) {
1548 skinny_metadata
= false;
1549 if (path
->slots
[0]) {
1551 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
1553 if (key
.objectid
== bytenr
&&
1554 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
1555 key
.offset
== num_bytes
)
1559 key
.objectid
= bytenr
;
1560 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1561 key
.offset
= num_bytes
;
1562 btrfs_release_path(path
);
1567 if (ret
&& !insert
) {
1570 } else if (WARN_ON(ret
)) {
1575 leaf
= path
->nodes
[0];
1576 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1577 if (unlikely(item_size
< sizeof(*ei
))) {
1579 btrfs_print_v0_err(fs_info
);
1580 btrfs_abort_transaction(trans
, err
);
1584 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1585 flags
= btrfs_extent_flags(leaf
, ei
);
1587 ptr
= (unsigned long)(ei
+ 1);
1588 end
= (unsigned long)ei
+ item_size
;
1590 if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
&& !skinny_metadata
) {
1591 ptr
+= sizeof(struct btrfs_tree_block_info
);
1595 if (owner
>= BTRFS_FIRST_FREE_OBJECTID
)
1596 needed
= BTRFS_REF_TYPE_DATA
;
1598 needed
= BTRFS_REF_TYPE_BLOCK
;
1606 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1607 type
= btrfs_get_extent_inline_ref_type(leaf
, iref
, needed
);
1608 if (type
== BTRFS_REF_TYPE_INVALID
) {
1616 ptr
+= btrfs_extent_inline_ref_size(type
);
1620 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1621 struct btrfs_extent_data_ref
*dref
;
1622 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1623 if (match_extent_data_ref(leaf
, dref
, root_objectid
,
1628 if (hash_extent_data_ref_item(leaf
, dref
) <
1629 hash_extent_data_ref(root_objectid
, owner
, offset
))
1633 ref_offset
= btrfs_extent_inline_ref_offset(leaf
, iref
);
1635 if (parent
== ref_offset
) {
1639 if (ref_offset
< parent
)
1642 if (root_objectid
== ref_offset
) {
1646 if (ref_offset
< root_objectid
)
1650 ptr
+= btrfs_extent_inline_ref_size(type
);
1652 if (err
== -ENOENT
&& insert
) {
1653 if (item_size
+ extra_size
>=
1654 BTRFS_MAX_EXTENT_ITEM_SIZE(root
)) {
1659 * To add new inline back ref, we have to make sure
1660 * there is no corresponding back ref item.
1661 * For simplicity, we just do not add new inline back
1662 * ref if there is any kind of item for this block
1664 if (find_next_key(path
, 0, &key
) == 0 &&
1665 key
.objectid
== bytenr
&&
1666 key
.type
< BTRFS_BLOCK_GROUP_ITEM_KEY
) {
1671 *ref_ret
= (struct btrfs_extent_inline_ref
*)ptr
;
1674 path
->keep_locks
= 0;
1675 btrfs_unlock_up_safe(path
, 1);
1681 * helper to add new inline back ref
1683 static noinline_for_stack
1684 void setup_inline_extent_backref(struct btrfs_fs_info
*fs_info
,
1685 struct btrfs_path
*path
,
1686 struct btrfs_extent_inline_ref
*iref
,
1687 u64 parent
, u64 root_objectid
,
1688 u64 owner
, u64 offset
, int refs_to_add
,
1689 struct btrfs_delayed_extent_op
*extent_op
)
1691 struct extent_buffer
*leaf
;
1692 struct btrfs_extent_item
*ei
;
1695 unsigned long item_offset
;
1700 leaf
= path
->nodes
[0];
1701 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1702 item_offset
= (unsigned long)iref
- (unsigned long)ei
;
1704 type
= extent_ref_type(parent
, owner
);
1705 size
= btrfs_extent_inline_ref_size(type
);
1707 btrfs_extend_item(fs_info
, path
, size
);
1709 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1710 refs
= btrfs_extent_refs(leaf
, ei
);
1711 refs
+= refs_to_add
;
1712 btrfs_set_extent_refs(leaf
, ei
, refs
);
1714 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1716 ptr
= (unsigned long)ei
+ item_offset
;
1717 end
= (unsigned long)ei
+ btrfs_item_size_nr(leaf
, path
->slots
[0]);
1718 if (ptr
< end
- size
)
1719 memmove_extent_buffer(leaf
, ptr
+ size
, ptr
,
1722 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1723 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
1724 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1725 struct btrfs_extent_data_ref
*dref
;
1726 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1727 btrfs_set_extent_data_ref_root(leaf
, dref
, root_objectid
);
1728 btrfs_set_extent_data_ref_objectid(leaf
, dref
, owner
);
1729 btrfs_set_extent_data_ref_offset(leaf
, dref
, offset
);
1730 btrfs_set_extent_data_ref_count(leaf
, dref
, refs_to_add
);
1731 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1732 struct btrfs_shared_data_ref
*sref
;
1733 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1734 btrfs_set_shared_data_ref_count(leaf
, sref
, refs_to_add
);
1735 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1736 } else if (type
== BTRFS_SHARED_BLOCK_REF_KEY
) {
1737 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1739 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
1741 btrfs_mark_buffer_dirty(leaf
);
1744 static int lookup_extent_backref(struct btrfs_trans_handle
*trans
,
1745 struct btrfs_path
*path
,
1746 struct btrfs_extent_inline_ref
**ref_ret
,
1747 u64 bytenr
, u64 num_bytes
, u64 parent
,
1748 u64 root_objectid
, u64 owner
, u64 offset
)
1752 ret
= lookup_inline_extent_backref(trans
, path
, ref_ret
, bytenr
,
1753 num_bytes
, parent
, root_objectid
,
1758 btrfs_release_path(path
);
1761 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1762 ret
= lookup_tree_block_ref(trans
, path
, bytenr
, parent
,
1765 ret
= lookup_extent_data_ref(trans
, path
, bytenr
, parent
,
1766 root_objectid
, owner
, offset
);
1772 * helper to update/remove inline back ref
1774 static noinline_for_stack
1775 void update_inline_extent_backref(struct btrfs_path
*path
,
1776 struct btrfs_extent_inline_ref
*iref
,
1778 struct btrfs_delayed_extent_op
*extent_op
,
1781 struct extent_buffer
*leaf
= path
->nodes
[0];
1782 struct btrfs_fs_info
*fs_info
= leaf
->fs_info
;
1783 struct btrfs_extent_item
*ei
;
1784 struct btrfs_extent_data_ref
*dref
= NULL
;
1785 struct btrfs_shared_data_ref
*sref
= NULL
;
1793 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1794 refs
= btrfs_extent_refs(leaf
, ei
);
1795 WARN_ON(refs_to_mod
< 0 && refs
+ refs_to_mod
<= 0);
1796 refs
+= refs_to_mod
;
1797 btrfs_set_extent_refs(leaf
, ei
, refs
);
1799 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1802 * If type is invalid, we should have bailed out after
1803 * lookup_inline_extent_backref().
1805 type
= btrfs_get_extent_inline_ref_type(leaf
, iref
, BTRFS_REF_TYPE_ANY
);
1806 ASSERT(type
!= BTRFS_REF_TYPE_INVALID
);
1808 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1809 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1810 refs
= btrfs_extent_data_ref_count(leaf
, dref
);
1811 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1812 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1813 refs
= btrfs_shared_data_ref_count(leaf
, sref
);
1816 BUG_ON(refs_to_mod
!= -1);
1819 BUG_ON(refs_to_mod
< 0 && refs
< -refs_to_mod
);
1820 refs
+= refs_to_mod
;
1823 if (type
== BTRFS_EXTENT_DATA_REF_KEY
)
1824 btrfs_set_extent_data_ref_count(leaf
, dref
, refs
);
1826 btrfs_set_shared_data_ref_count(leaf
, sref
, refs
);
1829 size
= btrfs_extent_inline_ref_size(type
);
1830 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1831 ptr
= (unsigned long)iref
;
1832 end
= (unsigned long)ei
+ item_size
;
1833 if (ptr
+ size
< end
)
1834 memmove_extent_buffer(leaf
, ptr
, ptr
+ size
,
1837 btrfs_truncate_item(fs_info
, path
, item_size
, 1);
1839 btrfs_mark_buffer_dirty(leaf
);
1842 static noinline_for_stack
1843 int insert_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1844 struct btrfs_path
*path
,
1845 u64 bytenr
, u64 num_bytes
, u64 parent
,
1846 u64 root_objectid
, u64 owner
,
1847 u64 offset
, int refs_to_add
,
1848 struct btrfs_delayed_extent_op
*extent_op
)
1850 struct btrfs_extent_inline_ref
*iref
;
1853 ret
= lookup_inline_extent_backref(trans
, path
, &iref
, bytenr
,
1854 num_bytes
, parent
, root_objectid
,
1857 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
);
1858 update_inline_extent_backref(path
, iref
, refs_to_add
,
1860 } else if (ret
== -ENOENT
) {
1861 setup_inline_extent_backref(trans
->fs_info
, path
, iref
, parent
,
1862 root_objectid
, owner
, offset
,
1863 refs_to_add
, extent_op
);
1869 static int insert_extent_backref(struct btrfs_trans_handle
*trans
,
1870 struct btrfs_path
*path
,
1871 u64 bytenr
, u64 parent
, u64 root_objectid
,
1872 u64 owner
, u64 offset
, int refs_to_add
)
1875 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1876 BUG_ON(refs_to_add
!= 1);
1877 ret
= insert_tree_block_ref(trans
, path
, bytenr
, parent
,
1880 ret
= insert_extent_data_ref(trans
, path
, bytenr
, parent
,
1881 root_objectid
, owner
, offset
,
1887 static int remove_extent_backref(struct btrfs_trans_handle
*trans
,
1888 struct btrfs_path
*path
,
1889 struct btrfs_extent_inline_ref
*iref
,
1890 int refs_to_drop
, int is_data
, int *last_ref
)
1894 BUG_ON(!is_data
&& refs_to_drop
!= 1);
1896 update_inline_extent_backref(path
, iref
, -refs_to_drop
, NULL
,
1898 } else if (is_data
) {
1899 ret
= remove_extent_data_ref(trans
, path
, refs_to_drop
,
1903 ret
= btrfs_del_item(trans
, trans
->fs_info
->extent_root
, path
);
1908 #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
1909 static int btrfs_issue_discard(struct block_device
*bdev
, u64 start
, u64 len
,
1910 u64
*discarded_bytes
)
1913 u64 bytes_left
, end
;
1914 u64 aligned_start
= ALIGN(start
, 1 << 9);
1916 if (WARN_ON(start
!= aligned_start
)) {
1917 len
-= aligned_start
- start
;
1918 len
= round_down(len
, 1 << 9);
1919 start
= aligned_start
;
1922 *discarded_bytes
= 0;
1930 /* Skip any superblocks on this device. */
1931 for (j
= 0; j
< BTRFS_SUPER_MIRROR_MAX
; j
++) {
1932 u64 sb_start
= btrfs_sb_offset(j
);
1933 u64 sb_end
= sb_start
+ BTRFS_SUPER_INFO_SIZE
;
1934 u64 size
= sb_start
- start
;
1936 if (!in_range(sb_start
, start
, bytes_left
) &&
1937 !in_range(sb_end
, start
, bytes_left
) &&
1938 !in_range(start
, sb_start
, BTRFS_SUPER_INFO_SIZE
))
1942 * Superblock spans beginning of range. Adjust start and
1945 if (sb_start
<= start
) {
1946 start
+= sb_end
- start
;
1951 bytes_left
= end
- start
;
1956 ret
= blkdev_issue_discard(bdev
, start
>> 9, size
>> 9,
1959 *discarded_bytes
+= size
;
1960 else if (ret
!= -EOPNOTSUPP
)
1969 bytes_left
= end
- start
;
1973 ret
= blkdev_issue_discard(bdev
, start
>> 9, bytes_left
>> 9,
1976 *discarded_bytes
+= bytes_left
;
1981 int btrfs_discard_extent(struct btrfs_fs_info
*fs_info
, u64 bytenr
,
1982 u64 num_bytes
, u64
*actual_bytes
)
1985 u64 discarded_bytes
= 0;
1986 struct btrfs_bio
*bbio
= NULL
;
1990 * Avoid races with device replace and make sure our bbio has devices
1991 * associated to its stripes that don't go away while we are discarding.
1993 btrfs_bio_counter_inc_blocked(fs_info
);
1994 /* Tell the block device(s) that the sectors can be discarded */
1995 ret
= btrfs_map_block(fs_info
, BTRFS_MAP_DISCARD
, bytenr
, &num_bytes
,
1997 /* Error condition is -ENOMEM */
1999 struct btrfs_bio_stripe
*stripe
= bbio
->stripes
;
2003 for (i
= 0; i
< bbio
->num_stripes
; i
++, stripe
++) {
2005 struct request_queue
*req_q
;
2007 if (!stripe
->dev
->bdev
) {
2008 ASSERT(btrfs_test_opt(fs_info
, DEGRADED
));
2011 req_q
= bdev_get_queue(stripe
->dev
->bdev
);
2012 if (!blk_queue_discard(req_q
))
2015 ret
= btrfs_issue_discard(stripe
->dev
->bdev
,
2020 discarded_bytes
+= bytes
;
2021 else if (ret
!= -EOPNOTSUPP
)
2022 break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */
2025 * Just in case we get back EOPNOTSUPP for some reason,
2026 * just ignore the return value so we don't screw up
2027 * people calling discard_extent.
2031 btrfs_put_bbio(bbio
);
2033 btrfs_bio_counter_dec(fs_info
);
2036 *actual_bytes
= discarded_bytes
;
2039 if (ret
== -EOPNOTSUPP
)
2044 /* Can return -ENOMEM */
2045 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
2046 struct btrfs_root
*root
,
2047 u64 bytenr
, u64 num_bytes
, u64 parent
,
2048 u64 root_objectid
, u64 owner
, u64 offset
)
2050 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2051 int old_ref_mod
, new_ref_mod
;
2054 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
&&
2055 root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
2057 btrfs_ref_tree_mod(root
, bytenr
, num_bytes
, parent
, root_objectid
,
2058 owner
, offset
, BTRFS_ADD_DELAYED_REF
);
2060 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
2061 ret
= btrfs_add_delayed_tree_ref(trans
, bytenr
,
2063 root_objectid
, (int)owner
,
2064 BTRFS_ADD_DELAYED_REF
, NULL
,
2065 &old_ref_mod
, &new_ref_mod
);
2067 ret
= btrfs_add_delayed_data_ref(trans
, bytenr
,
2069 root_objectid
, owner
, offset
,
2070 0, BTRFS_ADD_DELAYED_REF
,
2071 &old_ref_mod
, &new_ref_mod
);
2074 if (ret
== 0 && old_ref_mod
< 0 && new_ref_mod
>= 0) {
2075 bool metadata
= owner
< BTRFS_FIRST_FREE_OBJECTID
;
2077 add_pinned_bytes(fs_info
, -num_bytes
, metadata
, root_objectid
);
2084 * __btrfs_inc_extent_ref - insert backreference for a given extent
2086 * @trans: Handle of transaction
2088 * @node: The delayed ref node used to get the bytenr/length for
2089 * extent whose references are incremented.
2091 * @parent: If this is a shared extent (BTRFS_SHARED_DATA_REF_KEY/
2092 * BTRFS_SHARED_BLOCK_REF_KEY) then it holds the logical
2093 * bytenr of the parent block. Since new extents are always
2094 * created with indirect references, this will only be the case
2095 * when relocating a shared extent. In that case, root_objectid
2096 * will be BTRFS_TREE_RELOC_OBJECTID. Otheriwse, parent must
2099 * @root_objectid: The id of the root where this modification has originated,
2100 * this can be either one of the well-known metadata trees or
2101 * the subvolume id which references this extent.
2103 * @owner: For data extents it is the inode number of the owning file.
2104 * For metadata extents this parameter holds the level in the
2105 * tree of the extent.
2107 * @offset: For metadata extents the offset is ignored and is currently
2108 * always passed as 0. For data extents it is the fileoffset
2109 * this extent belongs to.
2111 * @refs_to_add Number of references to add
2113 * @extent_op Pointer to a structure, holding information necessary when
2114 * updating a tree block's flags
2117 static int __btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
2118 struct btrfs_delayed_ref_node
*node
,
2119 u64 parent
, u64 root_objectid
,
2120 u64 owner
, u64 offset
, int refs_to_add
,
2121 struct btrfs_delayed_extent_op
*extent_op
)
2123 struct btrfs_path
*path
;
2124 struct extent_buffer
*leaf
;
2125 struct btrfs_extent_item
*item
;
2126 struct btrfs_key key
;
2127 u64 bytenr
= node
->bytenr
;
2128 u64 num_bytes
= node
->num_bytes
;
2132 path
= btrfs_alloc_path();
2136 path
->reada
= READA_FORWARD
;
2137 path
->leave_spinning
= 1;
2138 /* this will setup the path even if it fails to insert the back ref */
2139 ret
= insert_inline_extent_backref(trans
, path
, bytenr
, num_bytes
,
2140 parent
, root_objectid
, owner
,
2141 offset
, refs_to_add
, extent_op
);
2142 if ((ret
< 0 && ret
!= -EAGAIN
) || !ret
)
2146 * Ok we had -EAGAIN which means we didn't have space to insert and
2147 * inline extent ref, so just update the reference count and add a
2150 leaf
= path
->nodes
[0];
2151 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2152 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2153 refs
= btrfs_extent_refs(leaf
, item
);
2154 btrfs_set_extent_refs(leaf
, item
, refs
+ refs_to_add
);
2156 __run_delayed_extent_op(extent_op
, leaf
, item
);
2158 btrfs_mark_buffer_dirty(leaf
);
2159 btrfs_release_path(path
);
2161 path
->reada
= READA_FORWARD
;
2162 path
->leave_spinning
= 1;
2163 /* now insert the actual backref */
2164 ret
= insert_extent_backref(trans
, path
, bytenr
, parent
, root_objectid
,
2165 owner
, offset
, refs_to_add
);
2167 btrfs_abort_transaction(trans
, ret
);
2169 btrfs_free_path(path
);
2173 static int run_delayed_data_ref(struct btrfs_trans_handle
*trans
,
2174 struct btrfs_delayed_ref_node
*node
,
2175 struct btrfs_delayed_extent_op
*extent_op
,
2176 int insert_reserved
)
2179 struct btrfs_delayed_data_ref
*ref
;
2180 struct btrfs_key ins
;
2185 ins
.objectid
= node
->bytenr
;
2186 ins
.offset
= node
->num_bytes
;
2187 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2189 ref
= btrfs_delayed_node_to_data_ref(node
);
2190 trace_run_delayed_data_ref(trans
->fs_info
, node
, ref
, node
->action
);
2192 if (node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2193 parent
= ref
->parent
;
2194 ref_root
= ref
->root
;
2196 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2198 flags
|= extent_op
->flags_to_set
;
2199 ret
= alloc_reserved_file_extent(trans
, parent
, ref_root
,
2200 flags
, ref
->objectid
,
2203 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2204 ret
= __btrfs_inc_extent_ref(trans
, node
, parent
, ref_root
,
2205 ref
->objectid
, ref
->offset
,
2206 node
->ref_mod
, extent_op
);
2207 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2208 ret
= __btrfs_free_extent(trans
, node
, parent
,
2209 ref_root
, ref
->objectid
,
2210 ref
->offset
, node
->ref_mod
,
2218 static void __run_delayed_extent_op(struct btrfs_delayed_extent_op
*extent_op
,
2219 struct extent_buffer
*leaf
,
2220 struct btrfs_extent_item
*ei
)
2222 u64 flags
= btrfs_extent_flags(leaf
, ei
);
2223 if (extent_op
->update_flags
) {
2224 flags
|= extent_op
->flags_to_set
;
2225 btrfs_set_extent_flags(leaf
, ei
, flags
);
2228 if (extent_op
->update_key
) {
2229 struct btrfs_tree_block_info
*bi
;
2230 BUG_ON(!(flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
));
2231 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
2232 btrfs_set_tree_block_key(leaf
, bi
, &extent_op
->key
);
2236 static int run_delayed_extent_op(struct btrfs_trans_handle
*trans
,
2237 struct btrfs_delayed_ref_head
*head
,
2238 struct btrfs_delayed_extent_op
*extent_op
)
2240 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
2241 struct btrfs_key key
;
2242 struct btrfs_path
*path
;
2243 struct btrfs_extent_item
*ei
;
2244 struct extent_buffer
*leaf
;
2248 int metadata
= !extent_op
->is_data
;
2253 if (metadata
&& !btrfs_fs_incompat(fs_info
, SKINNY_METADATA
))
2256 path
= btrfs_alloc_path();
2260 key
.objectid
= head
->bytenr
;
2263 key
.type
= BTRFS_METADATA_ITEM_KEY
;
2264 key
.offset
= extent_op
->level
;
2266 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2267 key
.offset
= head
->num_bytes
;
2271 path
->reada
= READA_FORWARD
;
2272 path
->leave_spinning
= 1;
2273 ret
= btrfs_search_slot(trans
, fs_info
->extent_root
, &key
, path
, 0, 1);
2280 if (path
->slots
[0] > 0) {
2282 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
2284 if (key
.objectid
== head
->bytenr
&&
2285 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
2286 key
.offset
== head
->num_bytes
)
2290 btrfs_release_path(path
);
2293 key
.objectid
= head
->bytenr
;
2294 key
.offset
= head
->num_bytes
;
2295 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2304 leaf
= path
->nodes
[0];
2305 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2307 if (unlikely(item_size
< sizeof(*ei
))) {
2309 btrfs_print_v0_err(fs_info
);
2310 btrfs_abort_transaction(trans
, err
);
2314 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2315 __run_delayed_extent_op(extent_op
, leaf
, ei
);
2317 btrfs_mark_buffer_dirty(leaf
);
2319 btrfs_free_path(path
);
2323 static int run_delayed_tree_ref(struct btrfs_trans_handle
*trans
,
2324 struct btrfs_delayed_ref_node
*node
,
2325 struct btrfs_delayed_extent_op
*extent_op
,
2326 int insert_reserved
)
2329 struct btrfs_delayed_tree_ref
*ref
;
2333 ref
= btrfs_delayed_node_to_tree_ref(node
);
2334 trace_run_delayed_tree_ref(trans
->fs_info
, node
, ref
, node
->action
);
2336 if (node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2337 parent
= ref
->parent
;
2338 ref_root
= ref
->root
;
2340 if (node
->ref_mod
!= 1) {
2341 btrfs_err(trans
->fs_info
,
2342 "btree block(%llu) has %d references rather than 1: action %d ref_root %llu parent %llu",
2343 node
->bytenr
, node
->ref_mod
, node
->action
, ref_root
,
2347 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2348 BUG_ON(!extent_op
|| !extent_op
->update_flags
);
2349 ret
= alloc_reserved_tree_block(trans
, node
, extent_op
);
2350 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2351 ret
= __btrfs_inc_extent_ref(trans
, node
, parent
, ref_root
,
2352 ref
->level
, 0, 1, extent_op
);
2353 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2354 ret
= __btrfs_free_extent(trans
, node
, parent
, ref_root
,
2355 ref
->level
, 0, 1, extent_op
);
2362 /* helper function to actually process a single delayed ref entry */
2363 static int run_one_delayed_ref(struct btrfs_trans_handle
*trans
,
2364 struct btrfs_delayed_ref_node
*node
,
2365 struct btrfs_delayed_extent_op
*extent_op
,
2366 int insert_reserved
)
2370 if (trans
->aborted
) {
2371 if (insert_reserved
)
2372 btrfs_pin_extent(trans
->fs_info
, node
->bytenr
,
2373 node
->num_bytes
, 1);
2377 if (node
->type
== BTRFS_TREE_BLOCK_REF_KEY
||
2378 node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2379 ret
= run_delayed_tree_ref(trans
, node
, extent_op
,
2381 else if (node
->type
== BTRFS_EXTENT_DATA_REF_KEY
||
2382 node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2383 ret
= run_delayed_data_ref(trans
, node
, extent_op
,
2387 if (ret
&& insert_reserved
)
2388 btrfs_pin_extent(trans
->fs_info
, node
->bytenr
,
2389 node
->num_bytes
, 1);
2393 static inline struct btrfs_delayed_ref_node
*
2394 select_delayed_ref(struct btrfs_delayed_ref_head
*head
)
2396 struct btrfs_delayed_ref_node
*ref
;
2398 if (RB_EMPTY_ROOT(&head
->ref_tree
.rb_root
))
2402 * Select a delayed ref of type BTRFS_ADD_DELAYED_REF first.
2403 * This is to prevent a ref count from going down to zero, which deletes
2404 * the extent item from the extent tree, when there still are references
2405 * to add, which would fail because they would not find the extent item.
2407 if (!list_empty(&head
->ref_add_list
))
2408 return list_first_entry(&head
->ref_add_list
,
2409 struct btrfs_delayed_ref_node
, add_list
);
2411 ref
= rb_entry(rb_first_cached(&head
->ref_tree
),
2412 struct btrfs_delayed_ref_node
, ref_node
);
2413 ASSERT(list_empty(&ref
->add_list
));
2417 static void unselect_delayed_ref_head(struct btrfs_delayed_ref_root
*delayed_refs
,
2418 struct btrfs_delayed_ref_head
*head
)
2420 spin_lock(&delayed_refs
->lock
);
2421 head
->processing
= 0;
2422 delayed_refs
->num_heads_ready
++;
2423 spin_unlock(&delayed_refs
->lock
);
2424 btrfs_delayed_ref_unlock(head
);
2427 static struct btrfs_delayed_extent_op
*cleanup_extent_op(
2428 struct btrfs_delayed_ref_head
*head
)
2430 struct btrfs_delayed_extent_op
*extent_op
= head
->extent_op
;
2435 if (head
->must_insert_reserved
) {
2436 head
->extent_op
= NULL
;
2437 btrfs_free_delayed_extent_op(extent_op
);
2443 static int run_and_cleanup_extent_op(struct btrfs_trans_handle
*trans
,
2444 struct btrfs_delayed_ref_head
*head
)
2446 struct btrfs_delayed_extent_op
*extent_op
;
2449 extent_op
= cleanup_extent_op(head
);
2452 head
->extent_op
= NULL
;
2453 spin_unlock(&head
->lock
);
2454 ret
= run_delayed_extent_op(trans
, head
, extent_op
);
2455 btrfs_free_delayed_extent_op(extent_op
);
2456 return ret
? ret
: 1;
2459 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info
*fs_info
,
2460 struct btrfs_delayed_ref_root
*delayed_refs
,
2461 struct btrfs_delayed_ref_head
*head
)
2463 int nr_items
= 1; /* Dropping this ref head update. */
2465 if (head
->total_ref_mod
< 0) {
2466 struct btrfs_space_info
*space_info
;
2470 flags
= BTRFS_BLOCK_GROUP_DATA
;
2471 else if (head
->is_system
)
2472 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
2474 flags
= BTRFS_BLOCK_GROUP_METADATA
;
2475 space_info
= __find_space_info(fs_info
, flags
);
2477 percpu_counter_add_batch(&space_info
->total_bytes_pinned
,
2479 BTRFS_TOTAL_BYTES_PINNED_BATCH
);
2482 * We had csum deletions accounted for in our delayed refs rsv,
2483 * we need to drop the csum leaves for this update from our
2486 if (head
->is_data
) {
2487 spin_lock(&delayed_refs
->lock
);
2488 delayed_refs
->pending_csums
-= head
->num_bytes
;
2489 spin_unlock(&delayed_refs
->lock
);
2490 nr_items
+= btrfs_csum_bytes_to_leaves(fs_info
,
2495 btrfs_delayed_refs_rsv_release(fs_info
, nr_items
);
2498 static int cleanup_ref_head(struct btrfs_trans_handle
*trans
,
2499 struct btrfs_delayed_ref_head
*head
)
2502 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
2503 struct btrfs_delayed_ref_root
*delayed_refs
;
2506 delayed_refs
= &trans
->transaction
->delayed_refs
;
2508 ret
= run_and_cleanup_extent_op(trans
, head
);
2510 unselect_delayed_ref_head(delayed_refs
, head
);
2511 btrfs_debug(fs_info
, "run_delayed_extent_op returned %d", ret
);
2518 * Need to drop our head ref lock and re-acquire the delayed ref lock
2519 * and then re-check to make sure nobody got added.
2521 spin_unlock(&head
->lock
);
2522 spin_lock(&delayed_refs
->lock
);
2523 spin_lock(&head
->lock
);
2524 if (!RB_EMPTY_ROOT(&head
->ref_tree
.rb_root
) || head
->extent_op
) {
2525 spin_unlock(&head
->lock
);
2526 spin_unlock(&delayed_refs
->lock
);
2529 btrfs_delete_ref_head(delayed_refs
, head
);
2530 spin_unlock(&head
->lock
);
2531 spin_unlock(&delayed_refs
->lock
);
2533 if (head
->must_insert_reserved
) {
2534 btrfs_pin_extent(fs_info
, head
->bytenr
,
2535 head
->num_bytes
, 1);
2536 if (head
->is_data
) {
2537 ret
= btrfs_del_csums(trans
, fs_info
, head
->bytenr
,
2542 btrfs_cleanup_ref_head_accounting(fs_info
, delayed_refs
, head
);
2544 trace_run_delayed_ref_head(fs_info
, head
, 0);
2545 btrfs_delayed_ref_unlock(head
);
2546 btrfs_put_delayed_ref_head(head
);
2550 static struct btrfs_delayed_ref_head
*btrfs_obtain_ref_head(
2551 struct btrfs_trans_handle
*trans
)
2553 struct btrfs_delayed_ref_root
*delayed_refs
=
2554 &trans
->transaction
->delayed_refs
;
2555 struct btrfs_delayed_ref_head
*head
= NULL
;
2558 spin_lock(&delayed_refs
->lock
);
2559 head
= btrfs_select_ref_head(delayed_refs
);
2561 spin_unlock(&delayed_refs
->lock
);
2566 * Grab the lock that says we are going to process all the refs for
2569 ret
= btrfs_delayed_ref_lock(delayed_refs
, head
);
2570 spin_unlock(&delayed_refs
->lock
);
2573 * We may have dropped the spin lock to get the head mutex lock, and
2574 * that might have given someone else time to free the head. If that's
2575 * true, it has been removed from our list and we can move on.
2578 head
= ERR_PTR(-EAGAIN
);
2583 static int btrfs_run_delayed_refs_for_head(struct btrfs_trans_handle
*trans
,
2584 struct btrfs_delayed_ref_head
*locked_ref
,
2585 unsigned long *run_refs
)
2587 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
2588 struct btrfs_delayed_ref_root
*delayed_refs
;
2589 struct btrfs_delayed_extent_op
*extent_op
;
2590 struct btrfs_delayed_ref_node
*ref
;
2591 int must_insert_reserved
= 0;
2594 delayed_refs
= &trans
->transaction
->delayed_refs
;
2596 lockdep_assert_held(&locked_ref
->mutex
);
2597 lockdep_assert_held(&locked_ref
->lock
);
2599 while ((ref
= select_delayed_ref(locked_ref
))) {
2601 btrfs_check_delayed_seq(fs_info
, ref
->seq
)) {
2602 spin_unlock(&locked_ref
->lock
);
2603 unselect_delayed_ref_head(delayed_refs
, locked_ref
);
2609 rb_erase_cached(&ref
->ref_node
, &locked_ref
->ref_tree
);
2610 RB_CLEAR_NODE(&ref
->ref_node
);
2611 if (!list_empty(&ref
->add_list
))
2612 list_del(&ref
->add_list
);
2614 * When we play the delayed ref, also correct the ref_mod on
2617 switch (ref
->action
) {
2618 case BTRFS_ADD_DELAYED_REF
:
2619 case BTRFS_ADD_DELAYED_EXTENT
:
2620 locked_ref
->ref_mod
-= ref
->ref_mod
;
2622 case BTRFS_DROP_DELAYED_REF
:
2623 locked_ref
->ref_mod
+= ref
->ref_mod
;
2628 atomic_dec(&delayed_refs
->num_entries
);
2631 * Record the must_insert_reserved flag before we drop the
2634 must_insert_reserved
= locked_ref
->must_insert_reserved
;
2635 locked_ref
->must_insert_reserved
= 0;
2637 extent_op
= locked_ref
->extent_op
;
2638 locked_ref
->extent_op
= NULL
;
2639 spin_unlock(&locked_ref
->lock
);
2641 ret
= run_one_delayed_ref(trans
, ref
, extent_op
,
2642 must_insert_reserved
);
2644 btrfs_free_delayed_extent_op(extent_op
);
2646 unselect_delayed_ref_head(delayed_refs
, locked_ref
);
2647 btrfs_put_delayed_ref(ref
);
2648 btrfs_debug(fs_info
, "run_one_delayed_ref returned %d",
2653 btrfs_put_delayed_ref(ref
);
2656 spin_lock(&locked_ref
->lock
);
2657 btrfs_merge_delayed_refs(trans
, delayed_refs
, locked_ref
);
2664 * Returns 0 on success or if called with an already aborted transaction.
2665 * Returns -ENOMEM or -EIO on failure and will abort the transaction.
2667 static noinline
int __btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2670 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
2671 struct btrfs_delayed_ref_root
*delayed_refs
;
2672 struct btrfs_delayed_ref_head
*locked_ref
= NULL
;
2673 ktime_t start
= ktime_get();
2675 unsigned long count
= 0;
2676 unsigned long actual_count
= 0;
2678 delayed_refs
= &trans
->transaction
->delayed_refs
;
2681 locked_ref
= btrfs_obtain_ref_head(trans
);
2682 if (IS_ERR_OR_NULL(locked_ref
)) {
2683 if (PTR_ERR(locked_ref
) == -EAGAIN
) {
2692 * We need to try and merge add/drops of the same ref since we
2693 * can run into issues with relocate dropping the implicit ref
2694 * and then it being added back again before the drop can
2695 * finish. If we merged anything we need to re-loop so we can
2697 * Or we can get node references of the same type that weren't
2698 * merged when created due to bumps in the tree mod seq, and
2699 * we need to merge them to prevent adding an inline extent
2700 * backref before dropping it (triggering a BUG_ON at
2701 * insert_inline_extent_backref()).
2703 spin_lock(&locked_ref
->lock
);
2704 btrfs_merge_delayed_refs(trans
, delayed_refs
, locked_ref
);
2706 ret
= btrfs_run_delayed_refs_for_head(trans
, locked_ref
,
2708 if (ret
< 0 && ret
!= -EAGAIN
) {
2710 * Error, btrfs_run_delayed_refs_for_head already
2711 * unlocked everything so just bail out
2716 * Success, perform the usual cleanup of a processed
2719 ret
= cleanup_ref_head(trans
, locked_ref
);
2721 /* We dropped our lock, we need to loop. */
2730 * Either success case or btrfs_run_delayed_refs_for_head
2731 * returned -EAGAIN, meaning we need to select another head
2736 } while ((nr
!= -1 && count
< nr
) || locked_ref
);
2739 * We don't want to include ref heads since we can have empty ref heads
2740 * and those will drastically skew our runtime down since we just do
2741 * accounting, no actual extent tree updates.
2743 if (actual_count
> 0) {
2744 u64 runtime
= ktime_to_ns(ktime_sub(ktime_get(), start
));
2748 * We weigh the current average higher than our current runtime
2749 * to avoid large swings in the average.
2751 spin_lock(&delayed_refs
->lock
);
2752 avg
= fs_info
->avg_delayed_ref_runtime
* 3 + runtime
;
2753 fs_info
->avg_delayed_ref_runtime
= avg
>> 2; /* div by 4 */
2754 spin_unlock(&delayed_refs
->lock
);
2759 #ifdef SCRAMBLE_DELAYED_REFS
2761 * Normally delayed refs get processed in ascending bytenr order. This
2762 * correlates in most cases to the order added. To expose dependencies on this
2763 * order, we start to process the tree in the middle instead of the beginning
2765 static u64
find_middle(struct rb_root
*root
)
2767 struct rb_node
*n
= root
->rb_node
;
2768 struct btrfs_delayed_ref_node
*entry
;
2771 u64 first
= 0, last
= 0;
2775 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2776 first
= entry
->bytenr
;
2780 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2781 last
= entry
->bytenr
;
2786 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2787 WARN_ON(!entry
->in_tree
);
2789 middle
= entry
->bytenr
;
2802 static inline u64
heads_to_leaves(struct btrfs_fs_info
*fs_info
, u64 heads
)
2806 num_bytes
= heads
* (sizeof(struct btrfs_extent_item
) +
2807 sizeof(struct btrfs_extent_inline_ref
));
2808 if (!btrfs_fs_incompat(fs_info
, SKINNY_METADATA
))
2809 num_bytes
+= heads
* sizeof(struct btrfs_tree_block_info
);
2812 * We don't ever fill up leaves all the way so multiply by 2 just to be
2813 * closer to what we're really going to want to use.
2815 return div_u64(num_bytes
, BTRFS_LEAF_DATA_SIZE(fs_info
));
2819 * Takes the number of bytes to be csumm'ed and figures out how many leaves it
2820 * would require to store the csums for that many bytes.
2822 u64
btrfs_csum_bytes_to_leaves(struct btrfs_fs_info
*fs_info
, u64 csum_bytes
)
2825 u64 num_csums_per_leaf
;
2828 csum_size
= BTRFS_MAX_ITEM_SIZE(fs_info
);
2829 num_csums_per_leaf
= div64_u64(csum_size
,
2830 (u64
)btrfs_super_csum_size(fs_info
->super_copy
));
2831 num_csums
= div64_u64(csum_bytes
, fs_info
->sectorsize
);
2832 num_csums
+= num_csums_per_leaf
- 1;
2833 num_csums
= div64_u64(num_csums
, num_csums_per_leaf
);
2837 bool btrfs_check_space_for_delayed_refs(struct btrfs_fs_info
*fs_info
)
2839 struct btrfs_block_rsv
*delayed_refs_rsv
= &fs_info
->delayed_refs_rsv
;
2840 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
2844 spin_lock(&global_rsv
->lock
);
2845 reserved
= global_rsv
->reserved
;
2846 spin_unlock(&global_rsv
->lock
);
2849 * Since the global reserve is just kind of magic we don't really want
2850 * to rely on it to save our bacon, so if our size is more than the
2851 * delayed_refs_rsv and the global rsv then it's time to think about
2854 spin_lock(&delayed_refs_rsv
->lock
);
2855 reserved
+= delayed_refs_rsv
->reserved
;
2856 if (delayed_refs_rsv
->size
>= reserved
)
2858 spin_unlock(&delayed_refs_rsv
->lock
);
2862 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle
*trans
)
2865 atomic_read(&trans
->transaction
->delayed_refs
.num_entries
);
2870 avg_runtime
= trans
->fs_info
->avg_delayed_ref_runtime
;
2871 val
= num_entries
* avg_runtime
;
2872 if (val
>= NSEC_PER_SEC
)
2874 if (val
>= NSEC_PER_SEC
/ 2)
2877 return btrfs_check_space_for_delayed_refs(trans
->fs_info
);
2880 struct async_delayed_refs
{
2881 struct btrfs_root
*root
;
2886 struct completion wait
;
2887 struct btrfs_work work
;
2890 static inline struct async_delayed_refs
*
2891 to_async_delayed_refs(struct btrfs_work
*work
)
2893 return container_of(work
, struct async_delayed_refs
, work
);
2896 static void delayed_ref_async_start(struct btrfs_work
*work
)
2898 struct async_delayed_refs
*async
= to_async_delayed_refs(work
);
2899 struct btrfs_trans_handle
*trans
;
2900 struct btrfs_fs_info
*fs_info
= async
->root
->fs_info
;
2903 /* if the commit is already started, we don't need to wait here */
2904 if (btrfs_transaction_blocked(fs_info
))
2907 trans
= btrfs_join_transaction(async
->root
);
2908 if (IS_ERR(trans
)) {
2909 async
->error
= PTR_ERR(trans
);
2913 /* Don't bother flushing if we got into a different transaction */
2914 if (trans
->transid
> async
->transid
)
2917 ret
= btrfs_run_delayed_refs(trans
, async
->count
);
2921 ret
= btrfs_end_transaction(trans
);
2922 if (ret
&& !async
->error
)
2926 complete(&async
->wait
);
2931 int btrfs_async_run_delayed_refs(struct btrfs_fs_info
*fs_info
,
2932 unsigned long count
, u64 transid
, int wait
)
2934 struct async_delayed_refs
*async
;
2937 async
= kmalloc(sizeof(*async
), GFP_NOFS
);
2941 async
->root
= fs_info
->tree_root
;
2942 async
->count
= count
;
2944 async
->transid
= transid
;
2949 init_completion(&async
->wait
);
2951 btrfs_init_work(&async
->work
, btrfs_extent_refs_helper
,
2952 delayed_ref_async_start
, NULL
, NULL
);
2954 btrfs_queue_work(fs_info
->extent_workers
, &async
->work
);
2957 wait_for_completion(&async
->wait
);
2966 * this starts processing the delayed reference count updates and
2967 * extent insertions we have queued up so far. count can be
2968 * 0, which means to process everything in the tree at the start
2969 * of the run (but not newly added entries), or it can be some target
2970 * number you'd like to process.
2972 * Returns 0 on success or if called with an aborted transaction
2973 * Returns <0 on error and aborts the transaction
2975 int btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2976 unsigned long count
)
2978 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
2979 struct rb_node
*node
;
2980 struct btrfs_delayed_ref_root
*delayed_refs
;
2981 struct btrfs_delayed_ref_head
*head
;
2983 int run_all
= count
== (unsigned long)-1;
2985 /* We'll clean this up in btrfs_cleanup_transaction */
2989 if (test_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE
, &fs_info
->flags
))
2992 delayed_refs
= &trans
->transaction
->delayed_refs
;
2994 count
= atomic_read(&delayed_refs
->num_entries
) * 2;
2997 #ifdef SCRAMBLE_DELAYED_REFS
2998 delayed_refs
->run_delayed_start
= find_middle(&delayed_refs
->root
);
3000 ret
= __btrfs_run_delayed_refs(trans
, count
);
3002 btrfs_abort_transaction(trans
, ret
);
3007 btrfs_create_pending_block_groups(trans
);
3009 spin_lock(&delayed_refs
->lock
);
3010 node
= rb_first_cached(&delayed_refs
->href_root
);
3012 spin_unlock(&delayed_refs
->lock
);
3015 head
= rb_entry(node
, struct btrfs_delayed_ref_head
,
3017 refcount_inc(&head
->refs
);
3018 spin_unlock(&delayed_refs
->lock
);
3020 /* Mutex was contended, block until it's released and retry. */
3021 mutex_lock(&head
->mutex
);
3022 mutex_unlock(&head
->mutex
);
3024 btrfs_put_delayed_ref_head(head
);
3032 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle
*trans
,
3033 struct btrfs_fs_info
*fs_info
,
3034 u64 bytenr
, u64 num_bytes
, u64 flags
,
3035 int level
, int is_data
)
3037 struct btrfs_delayed_extent_op
*extent_op
;
3040 extent_op
= btrfs_alloc_delayed_extent_op();
3044 extent_op
->flags_to_set
= flags
;
3045 extent_op
->update_flags
= true;
3046 extent_op
->update_key
= false;
3047 extent_op
->is_data
= is_data
? true : false;
3048 extent_op
->level
= level
;
3050 ret
= btrfs_add_delayed_extent_op(fs_info
, trans
, bytenr
,
3051 num_bytes
, extent_op
);
3053 btrfs_free_delayed_extent_op(extent_op
);
3057 static noinline
int check_delayed_ref(struct btrfs_root
*root
,
3058 struct btrfs_path
*path
,
3059 u64 objectid
, u64 offset
, u64 bytenr
)
3061 struct btrfs_delayed_ref_head
*head
;
3062 struct btrfs_delayed_ref_node
*ref
;
3063 struct btrfs_delayed_data_ref
*data_ref
;
3064 struct btrfs_delayed_ref_root
*delayed_refs
;
3065 struct btrfs_transaction
*cur_trans
;
3066 struct rb_node
*node
;
3069 spin_lock(&root
->fs_info
->trans_lock
);
3070 cur_trans
= root
->fs_info
->running_transaction
;
3072 refcount_inc(&cur_trans
->use_count
);
3073 spin_unlock(&root
->fs_info
->trans_lock
);
3077 delayed_refs
= &cur_trans
->delayed_refs
;
3078 spin_lock(&delayed_refs
->lock
);
3079 head
= btrfs_find_delayed_ref_head(delayed_refs
, bytenr
);
3081 spin_unlock(&delayed_refs
->lock
);
3082 btrfs_put_transaction(cur_trans
);
3086 if (!mutex_trylock(&head
->mutex
)) {
3087 refcount_inc(&head
->refs
);
3088 spin_unlock(&delayed_refs
->lock
);
3090 btrfs_release_path(path
);
3093 * Mutex was contended, block until it's released and let
3096 mutex_lock(&head
->mutex
);
3097 mutex_unlock(&head
->mutex
);
3098 btrfs_put_delayed_ref_head(head
);
3099 btrfs_put_transaction(cur_trans
);
3102 spin_unlock(&delayed_refs
->lock
);
3104 spin_lock(&head
->lock
);
3106 * XXX: We should replace this with a proper search function in the
3109 for (node
= rb_first_cached(&head
->ref_tree
); node
;
3110 node
= rb_next(node
)) {
3111 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
, ref_node
);
3112 /* If it's a shared ref we know a cross reference exists */
3113 if (ref
->type
!= BTRFS_EXTENT_DATA_REF_KEY
) {
3118 data_ref
= btrfs_delayed_node_to_data_ref(ref
);
3121 * If our ref doesn't match the one we're currently looking at
3122 * then we have a cross reference.
3124 if (data_ref
->root
!= root
->root_key
.objectid
||
3125 data_ref
->objectid
!= objectid
||
3126 data_ref
->offset
!= offset
) {
3131 spin_unlock(&head
->lock
);
3132 mutex_unlock(&head
->mutex
);
3133 btrfs_put_transaction(cur_trans
);
3137 static noinline
int check_committed_ref(struct btrfs_root
*root
,
3138 struct btrfs_path
*path
,
3139 u64 objectid
, u64 offset
, u64 bytenr
)
3141 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3142 struct btrfs_root
*extent_root
= fs_info
->extent_root
;
3143 struct extent_buffer
*leaf
;
3144 struct btrfs_extent_data_ref
*ref
;
3145 struct btrfs_extent_inline_ref
*iref
;
3146 struct btrfs_extent_item
*ei
;
3147 struct btrfs_key key
;
3152 key
.objectid
= bytenr
;
3153 key
.offset
= (u64
)-1;
3154 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
3156 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
3159 BUG_ON(ret
== 0); /* Corruption */
3162 if (path
->slots
[0] == 0)
3166 leaf
= path
->nodes
[0];
3167 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
3169 if (key
.objectid
!= bytenr
|| key
.type
!= BTRFS_EXTENT_ITEM_KEY
)
3173 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
3174 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
3176 if (item_size
!= sizeof(*ei
) +
3177 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY
))
3180 if (btrfs_extent_generation(leaf
, ei
) <=
3181 btrfs_root_last_snapshot(&root
->root_item
))
3184 iref
= (struct btrfs_extent_inline_ref
*)(ei
+ 1);
3186 type
= btrfs_get_extent_inline_ref_type(leaf
, iref
, BTRFS_REF_TYPE_DATA
);
3187 if (type
!= BTRFS_EXTENT_DATA_REF_KEY
)
3190 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
3191 if (btrfs_extent_refs(leaf
, ei
) !=
3192 btrfs_extent_data_ref_count(leaf
, ref
) ||
3193 btrfs_extent_data_ref_root(leaf
, ref
) !=
3194 root
->root_key
.objectid
||
3195 btrfs_extent_data_ref_objectid(leaf
, ref
) != objectid
||
3196 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
3204 int btrfs_cross_ref_exist(struct btrfs_root
*root
, u64 objectid
, u64 offset
,
3207 struct btrfs_path
*path
;
3210 path
= btrfs_alloc_path();
3215 ret
= check_committed_ref(root
, path
, objectid
,
3217 if (ret
&& ret
!= -ENOENT
)
3220 ret
= check_delayed_ref(root
, path
, objectid
, offset
, bytenr
);
3221 } while (ret
== -EAGAIN
);
3224 btrfs_free_path(path
);
3225 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
3230 static int __btrfs_mod_ref(struct btrfs_trans_handle
*trans
,
3231 struct btrfs_root
*root
,
3232 struct extent_buffer
*buf
,
3233 int full_backref
, int inc
)
3235 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3241 struct btrfs_key key
;
3242 struct btrfs_file_extent_item
*fi
;
3246 int (*process_func
)(struct btrfs_trans_handle
*,
3247 struct btrfs_root
*,
3248 u64
, u64
, u64
, u64
, u64
, u64
);
3251 if (btrfs_is_testing(fs_info
))
3254 ref_root
= btrfs_header_owner(buf
);
3255 nritems
= btrfs_header_nritems(buf
);
3256 level
= btrfs_header_level(buf
);
3258 if (!test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) && level
== 0)
3262 process_func
= btrfs_inc_extent_ref
;
3264 process_func
= btrfs_free_extent
;
3267 parent
= buf
->start
;
3271 for (i
= 0; i
< nritems
; i
++) {
3273 btrfs_item_key_to_cpu(buf
, &key
, i
);
3274 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
3276 fi
= btrfs_item_ptr(buf
, i
,
3277 struct btrfs_file_extent_item
);
3278 if (btrfs_file_extent_type(buf
, fi
) ==
3279 BTRFS_FILE_EXTENT_INLINE
)
3281 bytenr
= btrfs_file_extent_disk_bytenr(buf
, fi
);
3285 num_bytes
= btrfs_file_extent_disk_num_bytes(buf
, fi
);
3286 key
.offset
-= btrfs_file_extent_offset(buf
, fi
);
3287 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
3288 parent
, ref_root
, key
.objectid
,
3293 bytenr
= btrfs_node_blockptr(buf
, i
);
3294 num_bytes
= fs_info
->nodesize
;
3295 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
3296 parent
, ref_root
, level
- 1, 0);
3306 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3307 struct extent_buffer
*buf
, int full_backref
)
3309 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 1);
3312 int btrfs_dec_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3313 struct extent_buffer
*buf
, int full_backref
)
3315 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 0);
3318 static int write_one_cache_group(struct btrfs_trans_handle
*trans
,
3319 struct btrfs_fs_info
*fs_info
,
3320 struct btrfs_path
*path
,
3321 struct btrfs_block_group_cache
*cache
)
3324 struct btrfs_root
*extent_root
= fs_info
->extent_root
;
3326 struct extent_buffer
*leaf
;
3328 ret
= btrfs_search_slot(trans
, extent_root
, &cache
->key
, path
, 0, 1);
3335 leaf
= path
->nodes
[0];
3336 bi
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
3337 write_extent_buffer(leaf
, &cache
->item
, bi
, sizeof(cache
->item
));
3338 btrfs_mark_buffer_dirty(leaf
);
3340 btrfs_release_path(path
);
3345 static struct btrfs_block_group_cache
*
3346 next_block_group(struct btrfs_fs_info
*fs_info
,
3347 struct btrfs_block_group_cache
*cache
)
3349 struct rb_node
*node
;
3351 spin_lock(&fs_info
->block_group_cache_lock
);
3353 /* If our block group was removed, we need a full search. */
3354 if (RB_EMPTY_NODE(&cache
->cache_node
)) {
3355 const u64 next_bytenr
= cache
->key
.objectid
+ cache
->key
.offset
;
3357 spin_unlock(&fs_info
->block_group_cache_lock
);
3358 btrfs_put_block_group(cache
);
3359 cache
= btrfs_lookup_first_block_group(fs_info
, next_bytenr
); return cache
;
3361 node
= rb_next(&cache
->cache_node
);
3362 btrfs_put_block_group(cache
);
3364 cache
= rb_entry(node
, struct btrfs_block_group_cache
,
3366 btrfs_get_block_group(cache
);
3369 spin_unlock(&fs_info
->block_group_cache_lock
);
3373 static int cache_save_setup(struct btrfs_block_group_cache
*block_group
,
3374 struct btrfs_trans_handle
*trans
,
3375 struct btrfs_path
*path
)
3377 struct btrfs_fs_info
*fs_info
= block_group
->fs_info
;
3378 struct btrfs_root
*root
= fs_info
->tree_root
;
3379 struct inode
*inode
= NULL
;
3380 struct extent_changeset
*data_reserved
= NULL
;
3382 int dcs
= BTRFS_DC_ERROR
;
3388 * If this block group is smaller than 100 megs don't bother caching the
3391 if (block_group
->key
.offset
< (100 * SZ_1M
)) {
3392 spin_lock(&block_group
->lock
);
3393 block_group
->disk_cache_state
= BTRFS_DC_WRITTEN
;
3394 spin_unlock(&block_group
->lock
);
3401 inode
= lookup_free_space_inode(fs_info
, block_group
, path
);
3402 if (IS_ERR(inode
) && PTR_ERR(inode
) != -ENOENT
) {
3403 ret
= PTR_ERR(inode
);
3404 btrfs_release_path(path
);
3408 if (IS_ERR(inode
)) {
3412 if (block_group
->ro
)
3415 ret
= create_free_space_inode(fs_info
, trans
, block_group
,
3423 * We want to set the generation to 0, that way if anything goes wrong
3424 * from here on out we know not to trust this cache when we load up next
3427 BTRFS_I(inode
)->generation
= 0;
3428 ret
= btrfs_update_inode(trans
, root
, inode
);
3431 * So theoretically we could recover from this, simply set the
3432 * super cache generation to 0 so we know to invalidate the
3433 * cache, but then we'd have to keep track of the block groups
3434 * that fail this way so we know we _have_ to reset this cache
3435 * before the next commit or risk reading stale cache. So to
3436 * limit our exposure to horrible edge cases lets just abort the
3437 * transaction, this only happens in really bad situations
3440 btrfs_abort_transaction(trans
, ret
);
3445 /* We've already setup this transaction, go ahead and exit */
3446 if (block_group
->cache_generation
== trans
->transid
&&
3447 i_size_read(inode
)) {
3448 dcs
= BTRFS_DC_SETUP
;
3452 if (i_size_read(inode
) > 0) {
3453 ret
= btrfs_check_trunc_cache_free_space(fs_info
,
3454 &fs_info
->global_block_rsv
);
3458 ret
= btrfs_truncate_free_space_cache(trans
, NULL
, inode
);
3463 spin_lock(&block_group
->lock
);
3464 if (block_group
->cached
!= BTRFS_CACHE_FINISHED
||
3465 !btrfs_test_opt(fs_info
, SPACE_CACHE
)) {
3467 * don't bother trying to write stuff out _if_
3468 * a) we're not cached,
3469 * b) we're with nospace_cache mount option,
3470 * c) we're with v2 space_cache (FREE_SPACE_TREE).
3472 dcs
= BTRFS_DC_WRITTEN
;
3473 spin_unlock(&block_group
->lock
);
3476 spin_unlock(&block_group
->lock
);
3479 * We hit an ENOSPC when setting up the cache in this transaction, just
3480 * skip doing the setup, we've already cleared the cache so we're safe.
3482 if (test_bit(BTRFS_TRANS_CACHE_ENOSPC
, &trans
->transaction
->flags
)) {
3488 * Try to preallocate enough space based on how big the block group is.
3489 * Keep in mind this has to include any pinned space which could end up
3490 * taking up quite a bit since it's not folded into the other space
3493 num_pages
= div_u64(block_group
->key
.offset
, SZ_256M
);
3498 num_pages
*= PAGE_SIZE
;
3500 ret
= btrfs_check_data_free_space(inode
, &data_reserved
, 0, num_pages
);
3504 ret
= btrfs_prealloc_file_range_trans(inode
, trans
, 0, 0, num_pages
,
3505 num_pages
, num_pages
,
3508 * Our cache requires contiguous chunks so that we don't modify a bunch
3509 * of metadata or split extents when writing the cache out, which means
3510 * we can enospc if we are heavily fragmented in addition to just normal
3511 * out of space conditions. So if we hit this just skip setting up any
3512 * other block groups for this transaction, maybe we'll unpin enough
3513 * space the next time around.
3516 dcs
= BTRFS_DC_SETUP
;
3517 else if (ret
== -ENOSPC
)
3518 set_bit(BTRFS_TRANS_CACHE_ENOSPC
, &trans
->transaction
->flags
);
3523 btrfs_release_path(path
);
3525 spin_lock(&block_group
->lock
);
3526 if (!ret
&& dcs
== BTRFS_DC_SETUP
)
3527 block_group
->cache_generation
= trans
->transid
;
3528 block_group
->disk_cache_state
= dcs
;
3529 spin_unlock(&block_group
->lock
);
3531 extent_changeset_free(data_reserved
);
3535 int btrfs_setup_space_cache(struct btrfs_trans_handle
*trans
,
3536 struct btrfs_fs_info
*fs_info
)
3538 struct btrfs_block_group_cache
*cache
, *tmp
;
3539 struct btrfs_transaction
*cur_trans
= trans
->transaction
;
3540 struct btrfs_path
*path
;
3542 if (list_empty(&cur_trans
->dirty_bgs
) ||
3543 !btrfs_test_opt(fs_info
, SPACE_CACHE
))
3546 path
= btrfs_alloc_path();
3550 /* Could add new block groups, use _safe just in case */
3551 list_for_each_entry_safe(cache
, tmp
, &cur_trans
->dirty_bgs
,
3553 if (cache
->disk_cache_state
== BTRFS_DC_CLEAR
)
3554 cache_save_setup(cache
, trans
, path
);
3557 btrfs_free_path(path
);
3562 * transaction commit does final block group cache writeback during a
3563 * critical section where nothing is allowed to change the FS. This is
3564 * required in order for the cache to actually match the block group,
3565 * but can introduce a lot of latency into the commit.
3567 * So, btrfs_start_dirty_block_groups is here to kick off block group
3568 * cache IO. There's a chance we'll have to redo some of it if the
3569 * block group changes again during the commit, but it greatly reduces
3570 * the commit latency by getting rid of the easy block groups while
3571 * we're still allowing others to join the commit.
3573 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle
*trans
)
3575 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
3576 struct btrfs_block_group_cache
*cache
;
3577 struct btrfs_transaction
*cur_trans
= trans
->transaction
;
3580 struct btrfs_path
*path
= NULL
;
3582 struct list_head
*io
= &cur_trans
->io_bgs
;
3583 int num_started
= 0;
3586 spin_lock(&cur_trans
->dirty_bgs_lock
);
3587 if (list_empty(&cur_trans
->dirty_bgs
)) {
3588 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3591 list_splice_init(&cur_trans
->dirty_bgs
, &dirty
);
3592 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3596 * make sure all the block groups on our dirty list actually
3599 btrfs_create_pending_block_groups(trans
);
3602 path
= btrfs_alloc_path();
3608 * cache_write_mutex is here only to save us from balance or automatic
3609 * removal of empty block groups deleting this block group while we are
3610 * writing out the cache
3612 mutex_lock(&trans
->transaction
->cache_write_mutex
);
3613 while (!list_empty(&dirty
)) {
3614 bool drop_reserve
= true;
3616 cache
= list_first_entry(&dirty
,
3617 struct btrfs_block_group_cache
,
3620 * this can happen if something re-dirties a block
3621 * group that is already under IO. Just wait for it to
3622 * finish and then do it all again
3624 if (!list_empty(&cache
->io_list
)) {
3625 list_del_init(&cache
->io_list
);
3626 btrfs_wait_cache_io(trans
, cache
, path
);
3627 btrfs_put_block_group(cache
);
3632 * btrfs_wait_cache_io uses the cache->dirty_list to decide
3633 * if it should update the cache_state. Don't delete
3634 * until after we wait.
3636 * Since we're not running in the commit critical section
3637 * we need the dirty_bgs_lock to protect from update_block_group
3639 spin_lock(&cur_trans
->dirty_bgs_lock
);
3640 list_del_init(&cache
->dirty_list
);
3641 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3645 cache_save_setup(cache
, trans
, path
);
3647 if (cache
->disk_cache_state
== BTRFS_DC_SETUP
) {
3648 cache
->io_ctl
.inode
= NULL
;
3649 ret
= btrfs_write_out_cache(fs_info
, trans
,
3651 if (ret
== 0 && cache
->io_ctl
.inode
) {
3656 * The cache_write_mutex is protecting the
3657 * io_list, also refer to the definition of
3658 * btrfs_transaction::io_bgs for more details
3660 list_add_tail(&cache
->io_list
, io
);
3663 * if we failed to write the cache, the
3664 * generation will be bad and life goes on
3670 ret
= write_one_cache_group(trans
, fs_info
,
3673 * Our block group might still be attached to the list
3674 * of new block groups in the transaction handle of some
3675 * other task (struct btrfs_trans_handle->new_bgs). This
3676 * means its block group item isn't yet in the extent
3677 * tree. If this happens ignore the error, as we will
3678 * try again later in the critical section of the
3679 * transaction commit.
3681 if (ret
== -ENOENT
) {
3683 spin_lock(&cur_trans
->dirty_bgs_lock
);
3684 if (list_empty(&cache
->dirty_list
)) {
3685 list_add_tail(&cache
->dirty_list
,
3686 &cur_trans
->dirty_bgs
);
3687 btrfs_get_block_group(cache
);
3688 drop_reserve
= false;
3690 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3692 btrfs_abort_transaction(trans
, ret
);
3696 /* if it's not on the io list, we need to put the block group */
3698 btrfs_put_block_group(cache
);
3700 btrfs_delayed_refs_rsv_release(fs_info
, 1);
3706 * Avoid blocking other tasks for too long. It might even save
3707 * us from writing caches for block groups that are going to be
3710 mutex_unlock(&trans
->transaction
->cache_write_mutex
);
3711 mutex_lock(&trans
->transaction
->cache_write_mutex
);
3713 mutex_unlock(&trans
->transaction
->cache_write_mutex
);
3716 * go through delayed refs for all the stuff we've just kicked off
3717 * and then loop back (just once)
3719 ret
= btrfs_run_delayed_refs(trans
, 0);
3720 if (!ret
&& loops
== 0) {
3722 spin_lock(&cur_trans
->dirty_bgs_lock
);
3723 list_splice_init(&cur_trans
->dirty_bgs
, &dirty
);
3725 * dirty_bgs_lock protects us from concurrent block group
3726 * deletes too (not just cache_write_mutex).
3728 if (!list_empty(&dirty
)) {
3729 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3732 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3733 } else if (ret
< 0) {
3734 btrfs_cleanup_dirty_bgs(cur_trans
, fs_info
);
3737 btrfs_free_path(path
);
3741 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
3742 struct btrfs_fs_info
*fs_info
)
3744 struct btrfs_block_group_cache
*cache
;
3745 struct btrfs_transaction
*cur_trans
= trans
->transaction
;
3748 struct btrfs_path
*path
;
3749 struct list_head
*io
= &cur_trans
->io_bgs
;
3750 int num_started
= 0;
3752 path
= btrfs_alloc_path();
3757 * Even though we are in the critical section of the transaction commit,
3758 * we can still have concurrent tasks adding elements to this
3759 * transaction's list of dirty block groups. These tasks correspond to
3760 * endio free space workers started when writeback finishes for a
3761 * space cache, which run inode.c:btrfs_finish_ordered_io(), and can
3762 * allocate new block groups as a result of COWing nodes of the root
3763 * tree when updating the free space inode. The writeback for the space
3764 * caches is triggered by an earlier call to
3765 * btrfs_start_dirty_block_groups() and iterations of the following
3767 * Also we want to do the cache_save_setup first and then run the
3768 * delayed refs to make sure we have the best chance at doing this all
3771 spin_lock(&cur_trans
->dirty_bgs_lock
);
3772 while (!list_empty(&cur_trans
->dirty_bgs
)) {
3773 cache
= list_first_entry(&cur_trans
->dirty_bgs
,
3774 struct btrfs_block_group_cache
,
3778 * this can happen if cache_save_setup re-dirties a block
3779 * group that is already under IO. Just wait for it to
3780 * finish and then do it all again
3782 if (!list_empty(&cache
->io_list
)) {
3783 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3784 list_del_init(&cache
->io_list
);
3785 btrfs_wait_cache_io(trans
, cache
, path
);
3786 btrfs_put_block_group(cache
);
3787 spin_lock(&cur_trans
->dirty_bgs_lock
);
3791 * don't remove from the dirty list until after we've waited
3794 list_del_init(&cache
->dirty_list
);
3795 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3798 cache_save_setup(cache
, trans
, path
);
3801 ret
= btrfs_run_delayed_refs(trans
,
3802 (unsigned long) -1);
3804 if (!ret
&& cache
->disk_cache_state
== BTRFS_DC_SETUP
) {
3805 cache
->io_ctl
.inode
= NULL
;
3806 ret
= btrfs_write_out_cache(fs_info
, trans
,
3808 if (ret
== 0 && cache
->io_ctl
.inode
) {
3811 list_add_tail(&cache
->io_list
, io
);
3814 * if we failed to write the cache, the
3815 * generation will be bad and life goes on
3821 ret
= write_one_cache_group(trans
, fs_info
,
3824 * One of the free space endio workers might have
3825 * created a new block group while updating a free space
3826 * cache's inode (at inode.c:btrfs_finish_ordered_io())
3827 * and hasn't released its transaction handle yet, in
3828 * which case the new block group is still attached to
3829 * its transaction handle and its creation has not
3830 * finished yet (no block group item in the extent tree
3831 * yet, etc). If this is the case, wait for all free
3832 * space endio workers to finish and retry. This is a
3833 * a very rare case so no need for a more efficient and
3836 if (ret
== -ENOENT
) {
3837 wait_event(cur_trans
->writer_wait
,
3838 atomic_read(&cur_trans
->num_writers
) == 1);
3839 ret
= write_one_cache_group(trans
, fs_info
,
3843 btrfs_abort_transaction(trans
, ret
);
3846 /* if its not on the io list, we need to put the block group */
3848 btrfs_put_block_group(cache
);
3849 btrfs_delayed_refs_rsv_release(fs_info
, 1);
3850 spin_lock(&cur_trans
->dirty_bgs_lock
);
3852 spin_unlock(&cur_trans
->dirty_bgs_lock
);
3855 * Refer to the definition of io_bgs member for details why it's safe
3856 * to use it without any locking
3858 while (!list_empty(io
)) {
3859 cache
= list_first_entry(io
, struct btrfs_block_group_cache
,
3861 list_del_init(&cache
->io_list
);
3862 btrfs_wait_cache_io(trans
, cache
, path
);
3863 btrfs_put_block_group(cache
);
3866 btrfs_free_path(path
);
3870 int btrfs_extent_readonly(struct btrfs_fs_info
*fs_info
, u64 bytenr
)
3872 struct btrfs_block_group_cache
*block_group
;
3875 block_group
= btrfs_lookup_block_group(fs_info
, bytenr
);
3876 if (!block_group
|| block_group
->ro
)
3879 btrfs_put_block_group(block_group
);
3883 bool btrfs_inc_nocow_writers(struct btrfs_fs_info
*fs_info
, u64 bytenr
)
3885 struct btrfs_block_group_cache
*bg
;
3888 bg
= btrfs_lookup_block_group(fs_info
, bytenr
);
3892 spin_lock(&bg
->lock
);
3896 atomic_inc(&bg
->nocow_writers
);
3897 spin_unlock(&bg
->lock
);
3899 /* no put on block group, done by btrfs_dec_nocow_writers */
3901 btrfs_put_block_group(bg
);
3907 void btrfs_dec_nocow_writers(struct btrfs_fs_info
*fs_info
, u64 bytenr
)
3909 struct btrfs_block_group_cache
*bg
;
3911 bg
= btrfs_lookup_block_group(fs_info
, bytenr
);
3913 if (atomic_dec_and_test(&bg
->nocow_writers
))
3914 wake_up_var(&bg
->nocow_writers
);
3916 * Once for our lookup and once for the lookup done by a previous call
3917 * to btrfs_inc_nocow_writers()
3919 btrfs_put_block_group(bg
);
3920 btrfs_put_block_group(bg
);
3923 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache
*bg
)
3925 wait_var_event(&bg
->nocow_writers
, !atomic_read(&bg
->nocow_writers
));
3928 static const char *alloc_name(u64 flags
)
3931 case BTRFS_BLOCK_GROUP_METADATA
|BTRFS_BLOCK_GROUP_DATA
:
3933 case BTRFS_BLOCK_GROUP_METADATA
:
3935 case BTRFS_BLOCK_GROUP_DATA
:
3937 case BTRFS_BLOCK_GROUP_SYSTEM
:
3941 return "invalid-combination";
3945 static int create_space_info(struct btrfs_fs_info
*info
, u64 flags
)
3948 struct btrfs_space_info
*space_info
;
3952 space_info
= kzalloc(sizeof(*space_info
), GFP_NOFS
);
3956 ret
= percpu_counter_init(&space_info
->total_bytes_pinned
, 0,
3963 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++)
3964 INIT_LIST_HEAD(&space_info
->block_groups
[i
]);
3965 init_rwsem(&space_info
->groups_sem
);
3966 spin_lock_init(&space_info
->lock
);
3967 space_info
->flags
= flags
& BTRFS_BLOCK_GROUP_TYPE_MASK
;
3968 space_info
->force_alloc
= CHUNK_ALLOC_NO_FORCE
;
3969 init_waitqueue_head(&space_info
->wait
);
3970 INIT_LIST_HEAD(&space_info
->ro_bgs
);
3971 INIT_LIST_HEAD(&space_info
->tickets
);
3972 INIT_LIST_HEAD(&space_info
->priority_tickets
);
3974 ret
= kobject_init_and_add(&space_info
->kobj
, &space_info_ktype
,
3975 info
->space_info_kobj
, "%s",
3976 alloc_name(space_info
->flags
));
3978 percpu_counter_destroy(&space_info
->total_bytes_pinned
);
3983 list_add_rcu(&space_info
->list
, &info
->space_info
);
3984 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3985 info
->data_sinfo
= space_info
;
3990 static void update_space_info(struct btrfs_fs_info
*info
, u64 flags
,
3991 u64 total_bytes
, u64 bytes_used
,
3993 struct btrfs_space_info
**space_info
)
3995 struct btrfs_space_info
*found
;
3998 factor
= btrfs_bg_type_to_factor(flags
);
4000 found
= __find_space_info(info
, flags
);
4002 spin_lock(&found
->lock
);
4003 found
->total_bytes
+= total_bytes
;
4004 found
->disk_total
+= total_bytes
* factor
;
4005 found
->bytes_used
+= bytes_used
;
4006 found
->disk_used
+= bytes_used
* factor
;
4007 found
->bytes_readonly
+= bytes_readonly
;
4008 if (total_bytes
> 0)
4010 space_info_add_new_bytes(info
, found
, total_bytes
-
4011 bytes_used
- bytes_readonly
);
4012 spin_unlock(&found
->lock
);
4013 *space_info
= found
;
4016 static void set_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
4018 u64 extra_flags
= chunk_to_extended(flags
) &
4019 BTRFS_EXTENDED_PROFILE_MASK
;
4021 write_seqlock(&fs_info
->profiles_lock
);
4022 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
4023 fs_info
->avail_data_alloc_bits
|= extra_flags
;
4024 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
4025 fs_info
->avail_metadata_alloc_bits
|= extra_flags
;
4026 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
4027 fs_info
->avail_system_alloc_bits
|= extra_flags
;
4028 write_sequnlock(&fs_info
->profiles_lock
);
4032 * returns target flags in extended format or 0 if restripe for this
4033 * chunk_type is not in progress
4035 * should be called with balance_lock held
4037 static u64
get_restripe_target(struct btrfs_fs_info
*fs_info
, u64 flags
)
4039 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
4045 if (flags
& BTRFS_BLOCK_GROUP_DATA
&&
4046 bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
4047 target
= BTRFS_BLOCK_GROUP_DATA
| bctl
->data
.target
;
4048 } else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
&&
4049 bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
4050 target
= BTRFS_BLOCK_GROUP_SYSTEM
| bctl
->sys
.target
;
4051 } else if (flags
& BTRFS_BLOCK_GROUP_METADATA
&&
4052 bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
4053 target
= BTRFS_BLOCK_GROUP_METADATA
| bctl
->meta
.target
;
4060 * @flags: available profiles in extended format (see ctree.h)
4062 * Returns reduced profile in chunk format. If profile changing is in
4063 * progress (either running or paused) picks the target profile (if it's
4064 * already available), otherwise falls back to plain reducing.
4066 static u64
btrfs_reduce_alloc_profile(struct btrfs_fs_info
*fs_info
, u64 flags
)
4068 u64 num_devices
= fs_info
->fs_devices
->rw_devices
;
4074 * see if restripe for this chunk_type is in progress, if so
4075 * try to reduce to the target profile
4077 spin_lock(&fs_info
->balance_lock
);
4078 target
= get_restripe_target(fs_info
, flags
);
4080 /* pick target profile only if it's already available */
4081 if ((flags
& target
) & BTRFS_EXTENDED_PROFILE_MASK
) {
4082 spin_unlock(&fs_info
->balance_lock
);
4083 return extended_to_chunk(target
);
4086 spin_unlock(&fs_info
->balance_lock
);
4088 /* First, mask out the RAID levels which aren't possible */
4089 for (raid_type
= 0; raid_type
< BTRFS_NR_RAID_TYPES
; raid_type
++) {
4090 if (num_devices
>= btrfs_raid_array
[raid_type
].devs_min
)
4091 allowed
|= btrfs_raid_array
[raid_type
].bg_flag
;
4095 if (allowed
& BTRFS_BLOCK_GROUP_RAID6
)
4096 allowed
= BTRFS_BLOCK_GROUP_RAID6
;
4097 else if (allowed
& BTRFS_BLOCK_GROUP_RAID5
)
4098 allowed
= BTRFS_BLOCK_GROUP_RAID5
;
4099 else if (allowed
& BTRFS_BLOCK_GROUP_RAID10
)
4100 allowed
= BTRFS_BLOCK_GROUP_RAID10
;
4101 else if (allowed
& BTRFS_BLOCK_GROUP_RAID1
)
4102 allowed
= BTRFS_BLOCK_GROUP_RAID1
;
4103 else if (allowed
& BTRFS_BLOCK_GROUP_RAID0
)
4104 allowed
= BTRFS_BLOCK_GROUP_RAID0
;
4106 flags
&= ~BTRFS_BLOCK_GROUP_PROFILE_MASK
;
4108 return extended_to_chunk(flags
| allowed
);
4111 static u64
get_alloc_profile(struct btrfs_fs_info
*fs_info
, u64 orig_flags
)
4118 seq
= read_seqbegin(&fs_info
->profiles_lock
);
4120 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
4121 flags
|= fs_info
->avail_data_alloc_bits
;
4122 else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
4123 flags
|= fs_info
->avail_system_alloc_bits
;
4124 else if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
4125 flags
|= fs_info
->avail_metadata_alloc_bits
;
4126 } while (read_seqretry(&fs_info
->profiles_lock
, seq
));
4128 return btrfs_reduce_alloc_profile(fs_info
, flags
);
4131 static u64
get_alloc_profile_by_root(struct btrfs_root
*root
, int data
)
4133 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4138 flags
= BTRFS_BLOCK_GROUP_DATA
;
4139 else if (root
== fs_info
->chunk_root
)
4140 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
4142 flags
= BTRFS_BLOCK_GROUP_METADATA
;
4144 ret
= get_alloc_profile(fs_info
, flags
);
4148 u64
btrfs_data_alloc_profile(struct btrfs_fs_info
*fs_info
)
4150 return get_alloc_profile(fs_info
, BTRFS_BLOCK_GROUP_DATA
);
4153 u64
btrfs_metadata_alloc_profile(struct btrfs_fs_info
*fs_info
)
4155 return get_alloc_profile(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4158 u64
btrfs_system_alloc_profile(struct btrfs_fs_info
*fs_info
)
4160 return get_alloc_profile(fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
4163 static u64
btrfs_space_info_used(struct btrfs_space_info
*s_info
,
4164 bool may_use_included
)
4167 return s_info
->bytes_used
+ s_info
->bytes_reserved
+
4168 s_info
->bytes_pinned
+ s_info
->bytes_readonly
+
4169 (may_use_included
? s_info
->bytes_may_use
: 0);
4172 int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode
*inode
, u64 bytes
)
4174 struct btrfs_root
*root
= inode
->root
;
4175 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4176 struct btrfs_space_info
*data_sinfo
= fs_info
->data_sinfo
;
4179 int need_commit
= 2;
4180 int have_pinned_space
;
4182 /* make sure bytes are sectorsize aligned */
4183 bytes
= ALIGN(bytes
, fs_info
->sectorsize
);
4185 if (btrfs_is_free_space_inode(inode
)) {
4187 ASSERT(current
->journal_info
);
4191 /* make sure we have enough space to handle the data first */
4192 spin_lock(&data_sinfo
->lock
);
4193 used
= btrfs_space_info_used(data_sinfo
, true);
4195 if (used
+ bytes
> data_sinfo
->total_bytes
) {
4196 struct btrfs_trans_handle
*trans
;
4199 * if we don't have enough free bytes in this space then we need
4200 * to alloc a new chunk.
4202 if (!data_sinfo
->full
) {
4205 data_sinfo
->force_alloc
= CHUNK_ALLOC_FORCE
;
4206 spin_unlock(&data_sinfo
->lock
);
4208 alloc_target
= btrfs_data_alloc_profile(fs_info
);
4210 * It is ugly that we don't call nolock join
4211 * transaction for the free space inode case here.
4212 * But it is safe because we only do the data space
4213 * reservation for the free space cache in the
4214 * transaction context, the common join transaction
4215 * just increase the counter of the current transaction
4216 * handler, doesn't try to acquire the trans_lock of
4219 trans
= btrfs_join_transaction(root
);
4221 return PTR_ERR(trans
);
4223 ret
= do_chunk_alloc(trans
, alloc_target
,
4224 CHUNK_ALLOC_NO_FORCE
);
4225 btrfs_end_transaction(trans
);
4230 have_pinned_space
= 1;
4239 * If we don't have enough pinned space to deal with this
4240 * allocation, and no removed chunk in current transaction,
4241 * don't bother committing the transaction.
4243 have_pinned_space
= __percpu_counter_compare(
4244 &data_sinfo
->total_bytes_pinned
,
4245 used
+ bytes
- data_sinfo
->total_bytes
,
4246 BTRFS_TOTAL_BYTES_PINNED_BATCH
);
4247 spin_unlock(&data_sinfo
->lock
);
4249 /* commit the current transaction and try again */
4254 if (need_commit
> 0) {
4255 btrfs_start_delalloc_roots(fs_info
, -1);
4256 btrfs_wait_ordered_roots(fs_info
, U64_MAX
, 0,
4260 trans
= btrfs_join_transaction(root
);
4262 return PTR_ERR(trans
);
4263 if (have_pinned_space
>= 0 ||
4264 test_bit(BTRFS_TRANS_HAVE_FREE_BGS
,
4265 &trans
->transaction
->flags
) ||
4267 ret
= btrfs_commit_transaction(trans
);
4271 * The cleaner kthread might still be doing iput
4272 * operations. Wait for it to finish so that
4273 * more space is released. We don't need to
4274 * explicitly run the delayed iputs here because
4275 * the commit_transaction would have woken up
4278 ret
= btrfs_wait_on_delayed_iputs(fs_info
);
4283 btrfs_end_transaction(trans
);
4287 trace_btrfs_space_reservation(fs_info
,
4288 "space_info:enospc",
4289 data_sinfo
->flags
, bytes
, 1);
4292 update_bytes_may_use(data_sinfo
, bytes
);
4293 trace_btrfs_space_reservation(fs_info
, "space_info",
4294 data_sinfo
->flags
, bytes
, 1);
4295 spin_unlock(&data_sinfo
->lock
);
4300 int btrfs_check_data_free_space(struct inode
*inode
,
4301 struct extent_changeset
**reserved
, u64 start
, u64 len
)
4303 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4306 /* align the range */
4307 len
= round_up(start
+ len
, fs_info
->sectorsize
) -
4308 round_down(start
, fs_info
->sectorsize
);
4309 start
= round_down(start
, fs_info
->sectorsize
);
4311 ret
= btrfs_alloc_data_chunk_ondemand(BTRFS_I(inode
), len
);
4315 /* Use new btrfs_qgroup_reserve_data to reserve precious data space. */
4316 ret
= btrfs_qgroup_reserve_data(inode
, reserved
, start
, len
);
4318 btrfs_free_reserved_data_space_noquota(inode
, start
, len
);
4325 * Called if we need to clear a data reservation for this inode
4326 * Normally in a error case.
4328 * This one will *NOT* use accurate qgroup reserved space API, just for case
4329 * which we can't sleep and is sure it won't affect qgroup reserved space.
4330 * Like clear_bit_hook().
4332 void btrfs_free_reserved_data_space_noquota(struct inode
*inode
, u64 start
,
4335 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4336 struct btrfs_space_info
*data_sinfo
;
4338 /* Make sure the range is aligned to sectorsize */
4339 len
= round_up(start
+ len
, fs_info
->sectorsize
) -
4340 round_down(start
, fs_info
->sectorsize
);
4341 start
= round_down(start
, fs_info
->sectorsize
);
4343 data_sinfo
= fs_info
->data_sinfo
;
4344 spin_lock(&data_sinfo
->lock
);
4345 update_bytes_may_use(data_sinfo
, -len
);
4346 trace_btrfs_space_reservation(fs_info
, "space_info",
4347 data_sinfo
->flags
, len
, 0);
4348 spin_unlock(&data_sinfo
->lock
);
4352 * Called if we need to clear a data reservation for this inode
4353 * Normally in a error case.
4355 * This one will handle the per-inode data rsv map for accurate reserved
4358 void btrfs_free_reserved_data_space(struct inode
*inode
,
4359 struct extent_changeset
*reserved
, u64 start
, u64 len
)
4361 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4363 /* Make sure the range is aligned to sectorsize */
4364 len
= round_up(start
+ len
, root
->fs_info
->sectorsize
) -
4365 round_down(start
, root
->fs_info
->sectorsize
);
4366 start
= round_down(start
, root
->fs_info
->sectorsize
);
4368 btrfs_free_reserved_data_space_noquota(inode
, start
, len
);
4369 btrfs_qgroup_free_data(inode
, reserved
, start
, len
);
4372 static void force_metadata_allocation(struct btrfs_fs_info
*info
)
4374 struct list_head
*head
= &info
->space_info
;
4375 struct btrfs_space_info
*found
;
4378 list_for_each_entry_rcu(found
, head
, list
) {
4379 if (found
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
4380 found
->force_alloc
= CHUNK_ALLOC_FORCE
;
4385 static inline u64
calc_global_rsv_need_space(struct btrfs_block_rsv
*global
)
4387 return (global
->size
<< 1);
4390 static int should_alloc_chunk(struct btrfs_fs_info
*fs_info
,
4391 struct btrfs_space_info
*sinfo
, int force
)
4393 u64 bytes_used
= btrfs_space_info_used(sinfo
, false);
4396 if (force
== CHUNK_ALLOC_FORCE
)
4400 * in limited mode, we want to have some free space up to
4401 * about 1% of the FS size.
4403 if (force
== CHUNK_ALLOC_LIMITED
) {
4404 thresh
= btrfs_super_total_bytes(fs_info
->super_copy
);
4405 thresh
= max_t(u64
, SZ_64M
, div_factor_fine(thresh
, 1));
4407 if (sinfo
->total_bytes
- bytes_used
< thresh
)
4411 if (bytes_used
+ SZ_2M
< div_factor(sinfo
->total_bytes
, 8))
4416 static u64
get_profile_num_devs(struct btrfs_fs_info
*fs_info
, u64 type
)
4420 if (type
& (BTRFS_BLOCK_GROUP_RAID10
|
4421 BTRFS_BLOCK_GROUP_RAID0
|
4422 BTRFS_BLOCK_GROUP_RAID5
|
4423 BTRFS_BLOCK_GROUP_RAID6
))
4424 num_dev
= fs_info
->fs_devices
->rw_devices
;
4425 else if (type
& BTRFS_BLOCK_GROUP_RAID1
)
4428 num_dev
= 1; /* DUP or single */
4434 * If @is_allocation is true, reserve space in the system space info necessary
4435 * for allocating a chunk, otherwise if it's false, reserve space necessary for
4438 void check_system_chunk(struct btrfs_trans_handle
*trans
, u64 type
)
4440 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
4441 struct btrfs_space_info
*info
;
4448 * Needed because we can end up allocating a system chunk and for an
4449 * atomic and race free space reservation in the chunk block reserve.
4451 lockdep_assert_held(&fs_info
->chunk_mutex
);
4453 info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
4454 spin_lock(&info
->lock
);
4455 left
= info
->total_bytes
- btrfs_space_info_used(info
, true);
4456 spin_unlock(&info
->lock
);
4458 num_devs
= get_profile_num_devs(fs_info
, type
);
4460 /* num_devs device items to update and 1 chunk item to add or remove */
4461 thresh
= btrfs_calc_trunc_metadata_size(fs_info
, num_devs
) +
4462 btrfs_calc_trans_metadata_size(fs_info
, 1);
4464 if (left
< thresh
&& btrfs_test_opt(fs_info
, ENOSPC_DEBUG
)) {
4465 btrfs_info(fs_info
, "left=%llu, need=%llu, flags=%llu",
4466 left
, thresh
, type
);
4467 dump_space_info(fs_info
, info
, 0, 0);
4470 if (left
< thresh
) {
4471 u64 flags
= btrfs_system_alloc_profile(fs_info
);
4474 * Ignore failure to create system chunk. We might end up not
4475 * needing it, as we might not need to COW all nodes/leafs from
4476 * the paths we visit in the chunk tree (they were already COWed
4477 * or created in the current transaction for example).
4479 ret
= btrfs_alloc_chunk(trans
, flags
);
4483 ret
= btrfs_block_rsv_add(fs_info
->chunk_root
,
4484 &fs_info
->chunk_block_rsv
,
4485 thresh
, BTRFS_RESERVE_NO_FLUSH
);
4487 trans
->chunk_bytes_reserved
+= thresh
;
4492 * If force is CHUNK_ALLOC_FORCE:
4493 * - return 1 if it successfully allocates a chunk,
4494 * - return errors including -ENOSPC otherwise.
4495 * If force is NOT CHUNK_ALLOC_FORCE:
4496 * - return 0 if it doesn't need to allocate a new chunk,
4497 * - return 1 if it successfully allocates a chunk,
4498 * - return errors including -ENOSPC otherwise.
4500 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
, u64 flags
,
4503 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
4504 struct btrfs_space_info
*space_info
;
4505 bool wait_for_alloc
= false;
4506 bool should_alloc
= false;
4509 /* Don't re-enter if we're already allocating a chunk */
4510 if (trans
->allocating_chunk
)
4513 space_info
= __find_space_info(fs_info
, flags
);
4517 spin_lock(&space_info
->lock
);
4518 if (force
< space_info
->force_alloc
)
4519 force
= space_info
->force_alloc
;
4520 should_alloc
= should_alloc_chunk(fs_info
, space_info
, force
);
4521 if (space_info
->full
) {
4522 /* No more free physical space */
4527 spin_unlock(&space_info
->lock
);
4529 } else if (!should_alloc
) {
4530 spin_unlock(&space_info
->lock
);
4532 } else if (space_info
->chunk_alloc
) {
4534 * Someone is already allocating, so we need to block
4535 * until this someone is finished and then loop to
4536 * recheck if we should continue with our allocation
4539 wait_for_alloc
= true;
4540 spin_unlock(&space_info
->lock
);
4541 mutex_lock(&fs_info
->chunk_mutex
);
4542 mutex_unlock(&fs_info
->chunk_mutex
);
4544 /* Proceed with allocation */
4545 space_info
->chunk_alloc
= 1;
4546 wait_for_alloc
= false;
4547 spin_unlock(&space_info
->lock
);
4551 } while (wait_for_alloc
);
4553 mutex_lock(&fs_info
->chunk_mutex
);
4554 trans
->allocating_chunk
= true;
4557 * If we have mixed data/metadata chunks we want to make sure we keep
4558 * allocating mixed chunks instead of individual chunks.
4560 if (btrfs_mixed_space_info(space_info
))
4561 flags
|= (BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
);
4564 * if we're doing a data chunk, go ahead and make sure that
4565 * we keep a reasonable number of metadata chunks allocated in the
4568 if (flags
& BTRFS_BLOCK_GROUP_DATA
&& fs_info
->metadata_ratio
) {
4569 fs_info
->data_chunk_allocations
++;
4570 if (!(fs_info
->data_chunk_allocations
%
4571 fs_info
->metadata_ratio
))
4572 force_metadata_allocation(fs_info
);
4576 * Check if we have enough space in SYSTEM chunk because we may need
4577 * to update devices.
4579 check_system_chunk(trans
, flags
);
4581 ret
= btrfs_alloc_chunk(trans
, flags
);
4582 trans
->allocating_chunk
= false;
4584 spin_lock(&space_info
->lock
);
4587 space_info
->full
= 1;
4592 space_info
->max_extent_size
= 0;
4595 space_info
->force_alloc
= CHUNK_ALLOC_NO_FORCE
;
4597 space_info
->chunk_alloc
= 0;
4598 spin_unlock(&space_info
->lock
);
4599 mutex_unlock(&fs_info
->chunk_mutex
);
4601 * When we allocate a new chunk we reserve space in the chunk block
4602 * reserve to make sure we can COW nodes/leafs in the chunk tree or
4603 * add new nodes/leafs to it if we end up needing to do it when
4604 * inserting the chunk item and updating device items as part of the
4605 * second phase of chunk allocation, performed by
4606 * btrfs_finish_chunk_alloc(). So make sure we don't accumulate a
4607 * large number of new block groups to create in our transaction
4608 * handle's new_bgs list to avoid exhausting the chunk block reserve
4609 * in extreme cases - like having a single transaction create many new
4610 * block groups when starting to write out the free space caches of all
4611 * the block groups that were made dirty during the lifetime of the
4614 if (trans
->chunk_bytes_reserved
>= (u64
)SZ_2M
)
4615 btrfs_create_pending_block_groups(trans
);
4620 static int can_overcommit(struct btrfs_fs_info
*fs_info
,
4621 struct btrfs_space_info
*space_info
, u64 bytes
,
4622 enum btrfs_reserve_flush_enum flush
,
4625 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
4632 /* Don't overcommit when in mixed mode. */
4633 if (space_info
->flags
& BTRFS_BLOCK_GROUP_DATA
)
4637 profile
= btrfs_system_alloc_profile(fs_info
);
4639 profile
= btrfs_metadata_alloc_profile(fs_info
);
4641 used
= btrfs_space_info_used(space_info
, false);
4644 * We only want to allow over committing if we have lots of actual space
4645 * free, but if we don't have enough space to handle the global reserve
4646 * space then we could end up having a real enospc problem when trying
4647 * to allocate a chunk or some other such important allocation.
4649 spin_lock(&global_rsv
->lock
);
4650 space_size
= calc_global_rsv_need_space(global_rsv
);
4651 spin_unlock(&global_rsv
->lock
);
4652 if (used
+ space_size
>= space_info
->total_bytes
)
4655 used
+= space_info
->bytes_may_use
;
4657 avail
= atomic64_read(&fs_info
->free_chunk_space
);
4660 * If we have dup, raid1 or raid10 then only half of the free
4661 * space is actually usable. For raid56, the space info used
4662 * doesn't include the parity drive, so we don't have to
4665 factor
= btrfs_bg_type_to_factor(profile
);
4666 avail
= div_u64(avail
, factor
);
4669 * If we aren't flushing all things, let us overcommit up to
4670 * 1/2th of the space. If we can flush, don't let us overcommit
4671 * too much, let it overcommit up to 1/8 of the space.
4673 if (flush
== BTRFS_RESERVE_FLUSH_ALL
)
4678 if (used
+ bytes
< space_info
->total_bytes
+ avail
)
4683 static void btrfs_writeback_inodes_sb_nr(struct btrfs_fs_info
*fs_info
,
4684 unsigned long nr_pages
, int nr_items
)
4686 struct super_block
*sb
= fs_info
->sb
;
4688 if (down_read_trylock(&sb
->s_umount
)) {
4689 writeback_inodes_sb_nr(sb
, nr_pages
, WB_REASON_FS_FREE_SPACE
);
4690 up_read(&sb
->s_umount
);
4693 * We needn't worry the filesystem going from r/w to r/o though
4694 * we don't acquire ->s_umount mutex, because the filesystem
4695 * should guarantee the delalloc inodes list be empty after
4696 * the filesystem is readonly(all dirty pages are written to
4699 btrfs_start_delalloc_roots(fs_info
, nr_items
);
4700 if (!current
->journal_info
)
4701 btrfs_wait_ordered_roots(fs_info
, nr_items
, 0, (u64
)-1);
4705 static inline u64
calc_reclaim_items_nr(struct btrfs_fs_info
*fs_info
,
4711 bytes
= btrfs_calc_trans_metadata_size(fs_info
, 1);
4712 nr
= div64_u64(to_reclaim
, bytes
);
4718 #define EXTENT_SIZE_PER_ITEM SZ_256K
4721 * shrink metadata reservation for delalloc
4723 static void shrink_delalloc(struct btrfs_fs_info
*fs_info
, u64 to_reclaim
,
4724 u64 orig
, bool wait_ordered
)
4726 struct btrfs_space_info
*space_info
;
4727 struct btrfs_trans_handle
*trans
;
4732 unsigned long nr_pages
;
4735 /* Calc the number of the pages we need flush for space reservation */
4736 items
= calc_reclaim_items_nr(fs_info
, to_reclaim
);
4737 to_reclaim
= items
* EXTENT_SIZE_PER_ITEM
;
4739 trans
= (struct btrfs_trans_handle
*)current
->journal_info
;
4740 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4742 delalloc_bytes
= percpu_counter_sum_positive(
4743 &fs_info
->delalloc_bytes
);
4744 if (delalloc_bytes
== 0) {
4748 btrfs_wait_ordered_roots(fs_info
, items
, 0, (u64
)-1);
4753 while (delalloc_bytes
&& loops
< 3) {
4754 nr_pages
= min(delalloc_bytes
, to_reclaim
) >> PAGE_SHIFT
;
4757 * Triggers inode writeback for up to nr_pages. This will invoke
4758 * ->writepages callback and trigger delalloc filling
4759 * (btrfs_run_delalloc_range()).
4761 btrfs_writeback_inodes_sb_nr(fs_info
, nr_pages
, items
);
4764 * We need to wait for the compressed pages to start before
4767 async_pages
= atomic_read(&fs_info
->async_delalloc_pages
);
4772 * Calculate how many compressed pages we want to be written
4773 * before we continue. I.e if there are more async pages than we
4774 * require wait_event will wait until nr_pages are written.
4776 if (async_pages
<= nr_pages
)
4779 async_pages
-= nr_pages
;
4781 wait_event(fs_info
->async_submit_wait
,
4782 atomic_read(&fs_info
->async_delalloc_pages
) <=
4785 spin_lock(&space_info
->lock
);
4786 if (list_empty(&space_info
->tickets
) &&
4787 list_empty(&space_info
->priority_tickets
)) {
4788 spin_unlock(&space_info
->lock
);
4791 spin_unlock(&space_info
->lock
);
4794 if (wait_ordered
&& !trans
) {
4795 btrfs_wait_ordered_roots(fs_info
, items
, 0, (u64
)-1);
4797 time_left
= schedule_timeout_killable(1);
4801 delalloc_bytes
= percpu_counter_sum_positive(
4802 &fs_info
->delalloc_bytes
);
4806 struct reserve_ticket
{
4810 struct list_head list
;
4811 wait_queue_head_t wait
;
4815 * maybe_commit_transaction - possibly commit the transaction if its ok to
4816 * @root - the root we're allocating for
4817 * @bytes - the number of bytes we want to reserve
4818 * @force - force the commit
4820 * This will check to make sure that committing the transaction will actually
4821 * get us somewhere and then commit the transaction if it does. Otherwise it
4822 * will return -ENOSPC.
4824 static int may_commit_transaction(struct btrfs_fs_info
*fs_info
,
4825 struct btrfs_space_info
*space_info
)
4827 struct reserve_ticket
*ticket
= NULL
;
4828 struct btrfs_block_rsv
*delayed_rsv
= &fs_info
->delayed_block_rsv
;
4829 struct btrfs_block_rsv
*delayed_refs_rsv
= &fs_info
->delayed_refs_rsv
;
4830 struct btrfs_trans_handle
*trans
;
4832 u64 reclaim_bytes
= 0;
4834 trans
= (struct btrfs_trans_handle
*)current
->journal_info
;
4838 spin_lock(&space_info
->lock
);
4839 if (!list_empty(&space_info
->priority_tickets
))
4840 ticket
= list_first_entry(&space_info
->priority_tickets
,
4841 struct reserve_ticket
, list
);
4842 else if (!list_empty(&space_info
->tickets
))
4843 ticket
= list_first_entry(&space_info
->tickets
,
4844 struct reserve_ticket
, list
);
4845 bytes_needed
= (ticket
) ? ticket
->bytes
: 0;
4846 spin_unlock(&space_info
->lock
);
4851 trans
= btrfs_join_transaction(fs_info
->extent_root
);
4853 return PTR_ERR(trans
);
4856 * See if there is enough pinned space to make this reservation, or if
4857 * we have block groups that are going to be freed, allowing us to
4858 * possibly do a chunk allocation the next loop through.
4860 if (test_bit(BTRFS_TRANS_HAVE_FREE_BGS
, &trans
->transaction
->flags
) ||
4861 __percpu_counter_compare(&space_info
->total_bytes_pinned
,
4863 BTRFS_TOTAL_BYTES_PINNED_BATCH
) >= 0)
4867 * See if there is some space in the delayed insertion reservation for
4870 if (space_info
!= delayed_rsv
->space_info
)
4873 spin_lock(&delayed_rsv
->lock
);
4874 reclaim_bytes
+= delayed_rsv
->reserved
;
4875 spin_unlock(&delayed_rsv
->lock
);
4877 spin_lock(&delayed_refs_rsv
->lock
);
4878 reclaim_bytes
+= delayed_refs_rsv
->reserved
;
4879 spin_unlock(&delayed_refs_rsv
->lock
);
4880 if (reclaim_bytes
>= bytes_needed
)
4882 bytes_needed
-= reclaim_bytes
;
4884 if (__percpu_counter_compare(&space_info
->total_bytes_pinned
,
4886 BTRFS_TOTAL_BYTES_PINNED_BATCH
) < 0)
4890 return btrfs_commit_transaction(trans
);
4892 btrfs_end_transaction(trans
);
4897 * Try to flush some data based on policy set by @state. This is only advisory
4898 * and may fail for various reasons. The caller is supposed to examine the
4899 * state of @space_info to detect the outcome.
4901 static void flush_space(struct btrfs_fs_info
*fs_info
,
4902 struct btrfs_space_info
*space_info
, u64 num_bytes
,
4905 struct btrfs_root
*root
= fs_info
->extent_root
;
4906 struct btrfs_trans_handle
*trans
;
4911 case FLUSH_DELAYED_ITEMS_NR
:
4912 case FLUSH_DELAYED_ITEMS
:
4913 if (state
== FLUSH_DELAYED_ITEMS_NR
)
4914 nr
= calc_reclaim_items_nr(fs_info
, num_bytes
) * 2;
4918 trans
= btrfs_join_transaction(root
);
4919 if (IS_ERR(trans
)) {
4920 ret
= PTR_ERR(trans
);
4923 ret
= btrfs_run_delayed_items_nr(trans
, nr
);
4924 btrfs_end_transaction(trans
);
4926 case FLUSH_DELALLOC
:
4927 case FLUSH_DELALLOC_WAIT
:
4928 shrink_delalloc(fs_info
, num_bytes
* 2, num_bytes
,
4929 state
== FLUSH_DELALLOC_WAIT
);
4931 case FLUSH_DELAYED_REFS_NR
:
4932 case FLUSH_DELAYED_REFS
:
4933 trans
= btrfs_join_transaction(root
);
4934 if (IS_ERR(trans
)) {
4935 ret
= PTR_ERR(trans
);
4938 if (state
== FLUSH_DELAYED_REFS_NR
)
4939 nr
= calc_reclaim_items_nr(fs_info
, num_bytes
);
4942 btrfs_run_delayed_refs(trans
, nr
);
4943 btrfs_end_transaction(trans
);
4946 case ALLOC_CHUNK_FORCE
:
4947 trans
= btrfs_join_transaction(root
);
4948 if (IS_ERR(trans
)) {
4949 ret
= PTR_ERR(trans
);
4952 ret
= do_chunk_alloc(trans
,
4953 btrfs_metadata_alloc_profile(fs_info
),
4954 (state
== ALLOC_CHUNK
) ?
4955 CHUNK_ALLOC_NO_FORCE
: CHUNK_ALLOC_FORCE
);
4956 btrfs_end_transaction(trans
);
4957 if (ret
> 0 || ret
== -ENOSPC
)
4962 * If we have pending delayed iputs then we could free up a
4963 * bunch of pinned space, so make sure we run the iputs before
4964 * we do our pinned bytes check below.
4966 btrfs_run_delayed_iputs(fs_info
);
4967 btrfs_wait_on_delayed_iputs(fs_info
);
4969 ret
= may_commit_transaction(fs_info
, space_info
);
4976 trace_btrfs_flush_space(fs_info
, space_info
->flags
, num_bytes
, state
,
4982 btrfs_calc_reclaim_metadata_size(struct btrfs_fs_info
*fs_info
,
4983 struct btrfs_space_info
*space_info
,
4986 struct reserve_ticket
*ticket
;
4991 list_for_each_entry(ticket
, &space_info
->tickets
, list
)
4992 to_reclaim
+= ticket
->bytes
;
4993 list_for_each_entry(ticket
, &space_info
->priority_tickets
, list
)
4994 to_reclaim
+= ticket
->bytes
;
4998 to_reclaim
= min_t(u64
, num_online_cpus() * SZ_1M
, SZ_16M
);
4999 if (can_overcommit(fs_info
, space_info
, to_reclaim
,
5000 BTRFS_RESERVE_FLUSH_ALL
, system_chunk
))
5003 used
= btrfs_space_info_used(space_info
, true);
5005 if (can_overcommit(fs_info
, space_info
, SZ_1M
,
5006 BTRFS_RESERVE_FLUSH_ALL
, system_chunk
))
5007 expected
= div_factor_fine(space_info
->total_bytes
, 95);
5009 expected
= div_factor_fine(space_info
->total_bytes
, 90);
5011 if (used
> expected
)
5012 to_reclaim
= used
- expected
;
5015 to_reclaim
= min(to_reclaim
, space_info
->bytes_may_use
+
5016 space_info
->bytes_reserved
);
5020 static inline int need_do_async_reclaim(struct btrfs_fs_info
*fs_info
,
5021 struct btrfs_space_info
*space_info
,
5022 u64 used
, bool system_chunk
)
5024 u64 thresh
= div_factor_fine(space_info
->total_bytes
, 98);
5026 /* If we're just plain full then async reclaim just slows us down. */
5027 if ((space_info
->bytes_used
+ space_info
->bytes_reserved
) >= thresh
)
5030 if (!btrfs_calc_reclaim_metadata_size(fs_info
, space_info
,
5034 return (used
>= thresh
&& !btrfs_fs_closing(fs_info
) &&
5035 !test_bit(BTRFS_FS_STATE_REMOUNTING
, &fs_info
->fs_state
));
5038 static bool wake_all_tickets(struct list_head
*head
)
5040 struct reserve_ticket
*ticket
;
5042 while (!list_empty(head
)) {
5043 ticket
= list_first_entry(head
, struct reserve_ticket
, list
);
5044 list_del_init(&ticket
->list
);
5045 ticket
->error
= -ENOSPC
;
5046 wake_up(&ticket
->wait
);
5047 if (ticket
->bytes
!= ticket
->orig_bytes
)
5054 * This is for normal flushers, we can wait all goddamned day if we want to. We
5055 * will loop and continuously try to flush as long as we are making progress.
5056 * We count progress as clearing off tickets each time we have to loop.
5058 static void btrfs_async_reclaim_metadata_space(struct work_struct
*work
)
5060 struct btrfs_fs_info
*fs_info
;
5061 struct btrfs_space_info
*space_info
;
5064 int commit_cycles
= 0;
5065 u64 last_tickets_id
;
5067 fs_info
= container_of(work
, struct btrfs_fs_info
, async_reclaim_work
);
5068 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
5070 spin_lock(&space_info
->lock
);
5071 to_reclaim
= btrfs_calc_reclaim_metadata_size(fs_info
, space_info
,
5074 space_info
->flush
= 0;
5075 spin_unlock(&space_info
->lock
);
5078 last_tickets_id
= space_info
->tickets_id
;
5079 spin_unlock(&space_info
->lock
);
5081 flush_state
= FLUSH_DELAYED_ITEMS_NR
;
5083 flush_space(fs_info
, space_info
, to_reclaim
, flush_state
);
5084 spin_lock(&space_info
->lock
);
5085 if (list_empty(&space_info
->tickets
)) {
5086 space_info
->flush
= 0;
5087 spin_unlock(&space_info
->lock
);
5090 to_reclaim
= btrfs_calc_reclaim_metadata_size(fs_info
,
5093 if (last_tickets_id
== space_info
->tickets_id
) {
5096 last_tickets_id
= space_info
->tickets_id
;
5097 flush_state
= FLUSH_DELAYED_ITEMS_NR
;
5103 * We don't want to force a chunk allocation until we've tried
5104 * pretty hard to reclaim space. Think of the case where we
5105 * freed up a bunch of space and so have a lot of pinned space
5106 * to reclaim. We would rather use that than possibly create a
5107 * underutilized metadata chunk. So if this is our first run
5108 * through the flushing state machine skip ALLOC_CHUNK_FORCE and
5109 * commit the transaction. If nothing has changed the next go
5110 * around then we can force a chunk allocation.
5112 if (flush_state
== ALLOC_CHUNK_FORCE
&& !commit_cycles
)
5115 if (flush_state
> COMMIT_TRANS
) {
5117 if (commit_cycles
> 2) {
5118 if (wake_all_tickets(&space_info
->tickets
)) {
5119 flush_state
= FLUSH_DELAYED_ITEMS_NR
;
5122 space_info
->flush
= 0;
5125 flush_state
= FLUSH_DELAYED_ITEMS_NR
;
5128 spin_unlock(&space_info
->lock
);
5129 } while (flush_state
<= COMMIT_TRANS
);
5132 void btrfs_init_async_reclaim_work(struct work_struct
*work
)
5134 INIT_WORK(work
, btrfs_async_reclaim_metadata_space
);
5137 static const enum btrfs_flush_state priority_flush_states
[] = {
5138 FLUSH_DELAYED_ITEMS_NR
,
5139 FLUSH_DELAYED_ITEMS
,
5143 static void priority_reclaim_metadata_space(struct btrfs_fs_info
*fs_info
,
5144 struct btrfs_space_info
*space_info
,
5145 struct reserve_ticket
*ticket
)
5150 spin_lock(&space_info
->lock
);
5151 to_reclaim
= btrfs_calc_reclaim_metadata_size(fs_info
, space_info
,
5154 spin_unlock(&space_info
->lock
);
5157 spin_unlock(&space_info
->lock
);
5161 flush_space(fs_info
, space_info
, to_reclaim
,
5162 priority_flush_states
[flush_state
]);
5164 spin_lock(&space_info
->lock
);
5165 if (ticket
->bytes
== 0) {
5166 spin_unlock(&space_info
->lock
);
5169 spin_unlock(&space_info
->lock
);
5170 } while (flush_state
< ARRAY_SIZE(priority_flush_states
));
5173 static int wait_reserve_ticket(struct btrfs_fs_info
*fs_info
,
5174 struct btrfs_space_info
*space_info
,
5175 struct reserve_ticket
*ticket
)
5179 u64 reclaim_bytes
= 0;
5182 spin_lock(&space_info
->lock
);
5183 while (ticket
->bytes
> 0 && ticket
->error
== 0) {
5184 ret
= prepare_to_wait_event(&ticket
->wait
, &wait
, TASK_KILLABLE
);
5189 spin_unlock(&space_info
->lock
);
5193 finish_wait(&ticket
->wait
, &wait
);
5194 spin_lock(&space_info
->lock
);
5197 ret
= ticket
->error
;
5198 if (!list_empty(&ticket
->list
))
5199 list_del_init(&ticket
->list
);
5200 if (ticket
->bytes
&& ticket
->bytes
< ticket
->orig_bytes
)
5201 reclaim_bytes
= ticket
->orig_bytes
- ticket
->bytes
;
5202 spin_unlock(&space_info
->lock
);
5205 space_info_add_old_bytes(fs_info
, space_info
, reclaim_bytes
);
5210 * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
5211 * @root - the root we're allocating for
5212 * @space_info - the space info we want to allocate from
5213 * @orig_bytes - the number of bytes we want
5214 * @flush - whether or not we can flush to make our reservation
5216 * This will reserve orig_bytes number of bytes from the space info associated
5217 * with the block_rsv. If there is not enough space it will make an attempt to
5218 * flush out space to make room. It will do this by flushing delalloc if
5219 * possible or committing the transaction. If flush is 0 then no attempts to
5220 * regain reservations will be made and this will fail if there is not enough
5223 static int __reserve_metadata_bytes(struct btrfs_fs_info
*fs_info
,
5224 struct btrfs_space_info
*space_info
,
5226 enum btrfs_reserve_flush_enum flush
,
5229 struct reserve_ticket ticket
;
5231 u64 reclaim_bytes
= 0;
5235 ASSERT(!current
->journal_info
|| flush
!= BTRFS_RESERVE_FLUSH_ALL
);
5237 spin_lock(&space_info
->lock
);
5239 used
= btrfs_space_info_used(space_info
, true);
5242 * If we have enough space then hooray, make our reservation and carry
5243 * on. If not see if we can overcommit, and if we can, hooray carry on.
5244 * If not things get more complicated.
5246 if (used
+ orig_bytes
<= space_info
->total_bytes
) {
5247 update_bytes_may_use(space_info
, orig_bytes
);
5248 trace_btrfs_space_reservation(fs_info
, "space_info",
5249 space_info
->flags
, orig_bytes
, 1);
5251 } else if (can_overcommit(fs_info
, space_info
, orig_bytes
, flush
,
5253 update_bytes_may_use(space_info
, orig_bytes
);
5254 trace_btrfs_space_reservation(fs_info
, "space_info",
5255 space_info
->flags
, orig_bytes
, 1);
5260 * If we couldn't make a reservation then setup our reservation ticket
5261 * and kick the async worker if it's not already running.
5263 * If we are a priority flusher then we just need to add our ticket to
5264 * the list and we will do our own flushing further down.
5266 if (ret
&& flush
!= BTRFS_RESERVE_NO_FLUSH
) {
5267 ticket
.orig_bytes
= orig_bytes
;
5268 ticket
.bytes
= orig_bytes
;
5270 init_waitqueue_head(&ticket
.wait
);
5271 if (flush
== BTRFS_RESERVE_FLUSH_ALL
) {
5272 list_add_tail(&ticket
.list
, &space_info
->tickets
);
5273 if (!space_info
->flush
) {
5274 space_info
->flush
= 1;
5275 trace_btrfs_trigger_flush(fs_info
,
5279 queue_work(system_unbound_wq
,
5280 &fs_info
->async_reclaim_work
);
5283 list_add_tail(&ticket
.list
,
5284 &space_info
->priority_tickets
);
5286 } else if (!ret
&& space_info
->flags
& BTRFS_BLOCK_GROUP_METADATA
) {
5289 * We will do the space reservation dance during log replay,
5290 * which means we won't have fs_info->fs_root set, so don't do
5291 * the async reclaim as we will panic.
5293 if (!test_bit(BTRFS_FS_LOG_RECOVERING
, &fs_info
->flags
) &&
5294 need_do_async_reclaim(fs_info
, space_info
,
5295 used
, system_chunk
) &&
5296 !work_busy(&fs_info
->async_reclaim_work
)) {
5297 trace_btrfs_trigger_flush(fs_info
, space_info
->flags
,
5298 orig_bytes
, flush
, "preempt");
5299 queue_work(system_unbound_wq
,
5300 &fs_info
->async_reclaim_work
);
5303 spin_unlock(&space_info
->lock
);
5304 if (!ret
|| flush
== BTRFS_RESERVE_NO_FLUSH
)
5307 if (flush
== BTRFS_RESERVE_FLUSH_ALL
)
5308 return wait_reserve_ticket(fs_info
, space_info
, &ticket
);
5311 priority_reclaim_metadata_space(fs_info
, space_info
, &ticket
);
5312 spin_lock(&space_info
->lock
);
5314 if (ticket
.bytes
< orig_bytes
)
5315 reclaim_bytes
= orig_bytes
- ticket
.bytes
;
5316 list_del_init(&ticket
.list
);
5319 spin_unlock(&space_info
->lock
);
5322 space_info_add_old_bytes(fs_info
, space_info
, reclaim_bytes
);
5323 ASSERT(list_empty(&ticket
.list
));
5328 * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
5329 * @root - the root we're allocating for
5330 * @block_rsv - the block_rsv we're allocating for
5331 * @orig_bytes - the number of bytes we want
5332 * @flush - whether or not we can flush to make our reservation
5334 * This will reserve orig_bytes number of bytes from the space info associated
5335 * with the block_rsv. If there is not enough space it will make an attempt to
5336 * flush out space to make room. It will do this by flushing delalloc if
5337 * possible or committing the transaction. If flush is 0 then no attempts to
5338 * regain reservations will be made and this will fail if there is not enough
5341 static int reserve_metadata_bytes(struct btrfs_root
*root
,
5342 struct btrfs_block_rsv
*block_rsv
,
5344 enum btrfs_reserve_flush_enum flush
)
5346 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5347 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
5349 bool system_chunk
= (root
== fs_info
->chunk_root
);
5351 ret
= __reserve_metadata_bytes(fs_info
, block_rsv
->space_info
,
5352 orig_bytes
, flush
, system_chunk
);
5353 if (ret
== -ENOSPC
&&
5354 unlikely(root
->orphan_cleanup_state
== ORPHAN_CLEANUP_STARTED
)) {
5355 if (block_rsv
!= global_rsv
&&
5356 !block_rsv_use_bytes(global_rsv
, orig_bytes
))
5359 if (ret
== -ENOSPC
) {
5360 trace_btrfs_space_reservation(fs_info
, "space_info:enospc",
5361 block_rsv
->space_info
->flags
,
5364 if (btrfs_test_opt(fs_info
, ENOSPC_DEBUG
))
5365 dump_space_info(fs_info
, block_rsv
->space_info
,
5371 static struct btrfs_block_rsv
*get_block_rsv(
5372 const struct btrfs_trans_handle
*trans
,
5373 const struct btrfs_root
*root
)
5375 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5376 struct btrfs_block_rsv
*block_rsv
= NULL
;
5378 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) ||
5379 (root
== fs_info
->csum_root
&& trans
->adding_csums
) ||
5380 (root
== fs_info
->uuid_root
))
5381 block_rsv
= trans
->block_rsv
;
5384 block_rsv
= root
->block_rsv
;
5387 block_rsv
= &fs_info
->empty_block_rsv
;
5392 static int block_rsv_use_bytes(struct btrfs_block_rsv
*block_rsv
,
5396 spin_lock(&block_rsv
->lock
);
5397 if (block_rsv
->reserved
>= num_bytes
) {
5398 block_rsv
->reserved
-= num_bytes
;
5399 if (block_rsv
->reserved
< block_rsv
->size
)
5400 block_rsv
->full
= 0;
5403 spin_unlock(&block_rsv
->lock
);
5407 static void block_rsv_add_bytes(struct btrfs_block_rsv
*block_rsv
,
5408 u64 num_bytes
, bool update_size
)
5410 spin_lock(&block_rsv
->lock
);
5411 block_rsv
->reserved
+= num_bytes
;
5413 block_rsv
->size
+= num_bytes
;
5414 else if (block_rsv
->reserved
>= block_rsv
->size
)
5415 block_rsv
->full
= 1;
5416 spin_unlock(&block_rsv
->lock
);
5419 int btrfs_cond_migrate_bytes(struct btrfs_fs_info
*fs_info
,
5420 struct btrfs_block_rsv
*dest
, u64 num_bytes
,
5423 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
5426 if (global_rsv
->space_info
!= dest
->space_info
)
5429 spin_lock(&global_rsv
->lock
);
5430 min_bytes
= div_factor(global_rsv
->size
, min_factor
);
5431 if (global_rsv
->reserved
< min_bytes
+ num_bytes
) {
5432 spin_unlock(&global_rsv
->lock
);
5435 global_rsv
->reserved
-= num_bytes
;
5436 if (global_rsv
->reserved
< global_rsv
->size
)
5437 global_rsv
->full
= 0;
5438 spin_unlock(&global_rsv
->lock
);
5440 block_rsv_add_bytes(dest
, num_bytes
, true);
5445 * btrfs_migrate_to_delayed_refs_rsv - transfer bytes to our delayed refs rsv.
5446 * @fs_info - the fs info for our fs.
5447 * @src - the source block rsv to transfer from.
5448 * @num_bytes - the number of bytes to transfer.
5450 * This transfers up to the num_bytes amount from the src rsv to the
5451 * delayed_refs_rsv. Any extra bytes are returned to the space info.
5453 void btrfs_migrate_to_delayed_refs_rsv(struct btrfs_fs_info
*fs_info
,
5454 struct btrfs_block_rsv
*src
,
5457 struct btrfs_block_rsv
*delayed_refs_rsv
= &fs_info
->delayed_refs_rsv
;
5460 spin_lock(&src
->lock
);
5461 src
->reserved
-= num_bytes
;
5462 src
->size
-= num_bytes
;
5463 spin_unlock(&src
->lock
);
5465 spin_lock(&delayed_refs_rsv
->lock
);
5466 if (delayed_refs_rsv
->size
> delayed_refs_rsv
->reserved
) {
5467 u64 delta
= delayed_refs_rsv
->size
-
5468 delayed_refs_rsv
->reserved
;
5469 if (num_bytes
> delta
) {
5470 to_free
= num_bytes
- delta
;
5474 to_free
= num_bytes
;
5479 delayed_refs_rsv
->reserved
+= num_bytes
;
5480 if (delayed_refs_rsv
->reserved
>= delayed_refs_rsv
->size
)
5481 delayed_refs_rsv
->full
= 1;
5482 spin_unlock(&delayed_refs_rsv
->lock
);
5485 trace_btrfs_space_reservation(fs_info
, "delayed_refs_rsv",
5488 space_info_add_old_bytes(fs_info
, delayed_refs_rsv
->space_info
,
5493 * btrfs_delayed_refs_rsv_refill - refill based on our delayed refs usage.
5494 * @fs_info - the fs_info for our fs.
5495 * @flush - control how we can flush for this reservation.
5497 * This will refill the delayed block_rsv up to 1 items size worth of space and
5498 * will return -ENOSPC if we can't make the reservation.
5500 int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info
*fs_info
,
5501 enum btrfs_reserve_flush_enum flush
)
5503 struct btrfs_block_rsv
*block_rsv
= &fs_info
->delayed_refs_rsv
;
5504 u64 limit
= btrfs_calc_trans_metadata_size(fs_info
, 1);
5508 spin_lock(&block_rsv
->lock
);
5509 if (block_rsv
->reserved
< block_rsv
->size
) {
5510 num_bytes
= block_rsv
->size
- block_rsv
->reserved
;
5511 num_bytes
= min(num_bytes
, limit
);
5513 spin_unlock(&block_rsv
->lock
);
5518 ret
= reserve_metadata_bytes(fs_info
->extent_root
, block_rsv
,
5522 block_rsv_add_bytes(block_rsv
, num_bytes
, 0);
5523 trace_btrfs_space_reservation(fs_info
, "delayed_refs_rsv",
5529 * This is for space we already have accounted in space_info->bytes_may_use, so
5530 * basically when we're returning space from block_rsv's.
5532 static void space_info_add_old_bytes(struct btrfs_fs_info
*fs_info
,
5533 struct btrfs_space_info
*space_info
,
5536 struct reserve_ticket
*ticket
;
5537 struct list_head
*head
;
5539 enum btrfs_reserve_flush_enum flush
= BTRFS_RESERVE_NO_FLUSH
;
5540 bool check_overcommit
= false;
5542 spin_lock(&space_info
->lock
);
5543 head
= &space_info
->priority_tickets
;
5546 * If we are over our limit then we need to check and see if we can
5547 * overcommit, and if we can't then we just need to free up our space
5548 * and not satisfy any requests.
5550 used
= btrfs_space_info_used(space_info
, true);
5551 if (used
- num_bytes
>= space_info
->total_bytes
)
5552 check_overcommit
= true;
5554 while (!list_empty(head
) && num_bytes
) {
5555 ticket
= list_first_entry(head
, struct reserve_ticket
,
5558 * We use 0 bytes because this space is already reserved, so
5559 * adding the ticket space would be a double count.
5561 if (check_overcommit
&&
5562 !can_overcommit(fs_info
, space_info
, 0, flush
, false))
5564 if (num_bytes
>= ticket
->bytes
) {
5565 list_del_init(&ticket
->list
);
5566 num_bytes
-= ticket
->bytes
;
5568 space_info
->tickets_id
++;
5569 wake_up(&ticket
->wait
);
5571 ticket
->bytes
-= num_bytes
;
5576 if (num_bytes
&& head
== &space_info
->priority_tickets
) {
5577 head
= &space_info
->tickets
;
5578 flush
= BTRFS_RESERVE_FLUSH_ALL
;
5581 update_bytes_may_use(space_info
, -num_bytes
);
5582 trace_btrfs_space_reservation(fs_info
, "space_info",
5583 space_info
->flags
, num_bytes
, 0);
5584 spin_unlock(&space_info
->lock
);
5588 * This is for newly allocated space that isn't accounted in
5589 * space_info->bytes_may_use yet. So if we allocate a chunk or unpin an extent
5590 * we use this helper.
5592 static void space_info_add_new_bytes(struct btrfs_fs_info
*fs_info
,
5593 struct btrfs_space_info
*space_info
,
5596 struct reserve_ticket
*ticket
;
5597 struct list_head
*head
= &space_info
->priority_tickets
;
5600 while (!list_empty(head
) && num_bytes
) {
5601 ticket
= list_first_entry(head
, struct reserve_ticket
,
5603 if (num_bytes
>= ticket
->bytes
) {
5604 trace_btrfs_space_reservation(fs_info
, "space_info",
5607 list_del_init(&ticket
->list
);
5608 num_bytes
-= ticket
->bytes
;
5609 update_bytes_may_use(space_info
, ticket
->bytes
);
5611 space_info
->tickets_id
++;
5612 wake_up(&ticket
->wait
);
5614 trace_btrfs_space_reservation(fs_info
, "space_info",
5617 update_bytes_may_use(space_info
, num_bytes
);
5618 ticket
->bytes
-= num_bytes
;
5623 if (num_bytes
&& head
== &space_info
->priority_tickets
) {
5624 head
= &space_info
->tickets
;
5629 static u64
block_rsv_release_bytes(struct btrfs_fs_info
*fs_info
,
5630 struct btrfs_block_rsv
*block_rsv
,
5631 struct btrfs_block_rsv
*dest
, u64 num_bytes
,
5632 u64
*qgroup_to_release_ret
)
5634 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
5635 u64 qgroup_to_release
= 0;
5638 spin_lock(&block_rsv
->lock
);
5639 if (num_bytes
== (u64
)-1) {
5640 num_bytes
= block_rsv
->size
;
5641 qgroup_to_release
= block_rsv
->qgroup_rsv_size
;
5643 block_rsv
->size
-= num_bytes
;
5644 if (block_rsv
->reserved
>= block_rsv
->size
) {
5645 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
5646 block_rsv
->reserved
= block_rsv
->size
;
5647 block_rsv
->full
= 1;
5651 if (block_rsv
->qgroup_rsv_reserved
>= block_rsv
->qgroup_rsv_size
) {
5652 qgroup_to_release
= block_rsv
->qgroup_rsv_reserved
-
5653 block_rsv
->qgroup_rsv_size
;
5654 block_rsv
->qgroup_rsv_reserved
= block_rsv
->qgroup_rsv_size
;
5656 qgroup_to_release
= 0;
5658 spin_unlock(&block_rsv
->lock
);
5661 if (num_bytes
> 0) {
5663 spin_lock(&dest
->lock
);
5667 bytes_to_add
= dest
->size
- dest
->reserved
;
5668 bytes_to_add
= min(num_bytes
, bytes_to_add
);
5669 dest
->reserved
+= bytes_to_add
;
5670 if (dest
->reserved
>= dest
->size
)
5672 num_bytes
-= bytes_to_add
;
5674 spin_unlock(&dest
->lock
);
5677 space_info_add_old_bytes(fs_info
, space_info
,
5680 if (qgroup_to_release_ret
)
5681 *qgroup_to_release_ret
= qgroup_to_release
;
5685 int btrfs_block_rsv_migrate(struct btrfs_block_rsv
*src
,
5686 struct btrfs_block_rsv
*dst
, u64 num_bytes
,
5691 ret
= block_rsv_use_bytes(src
, num_bytes
);
5695 block_rsv_add_bytes(dst
, num_bytes
, update_size
);
5699 void btrfs_init_block_rsv(struct btrfs_block_rsv
*rsv
, unsigned short type
)
5701 memset(rsv
, 0, sizeof(*rsv
));
5702 spin_lock_init(&rsv
->lock
);
5706 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info
*fs_info
,
5707 struct btrfs_block_rsv
*rsv
,
5708 unsigned short type
)
5710 btrfs_init_block_rsv(rsv
, type
);
5711 rsv
->space_info
= __find_space_info(fs_info
,
5712 BTRFS_BLOCK_GROUP_METADATA
);
5715 struct btrfs_block_rsv
*btrfs_alloc_block_rsv(struct btrfs_fs_info
*fs_info
,
5716 unsigned short type
)
5718 struct btrfs_block_rsv
*block_rsv
;
5720 block_rsv
= kmalloc(sizeof(*block_rsv
), GFP_NOFS
);
5724 btrfs_init_metadata_block_rsv(fs_info
, block_rsv
, type
);
5728 void btrfs_free_block_rsv(struct btrfs_fs_info
*fs_info
,
5729 struct btrfs_block_rsv
*rsv
)
5733 btrfs_block_rsv_release(fs_info
, rsv
, (u64
)-1);
5737 int btrfs_block_rsv_add(struct btrfs_root
*root
,
5738 struct btrfs_block_rsv
*block_rsv
, u64 num_bytes
,
5739 enum btrfs_reserve_flush_enum flush
)
5746 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
5748 block_rsv_add_bytes(block_rsv
, num_bytes
, true);
5753 int btrfs_block_rsv_check(struct btrfs_block_rsv
*block_rsv
, int min_factor
)
5761 spin_lock(&block_rsv
->lock
);
5762 num_bytes
= div_factor(block_rsv
->size
, min_factor
);
5763 if (block_rsv
->reserved
>= num_bytes
)
5765 spin_unlock(&block_rsv
->lock
);
5770 int btrfs_block_rsv_refill(struct btrfs_root
*root
,
5771 struct btrfs_block_rsv
*block_rsv
, u64 min_reserved
,
5772 enum btrfs_reserve_flush_enum flush
)
5780 spin_lock(&block_rsv
->lock
);
5781 num_bytes
= min_reserved
;
5782 if (block_rsv
->reserved
>= num_bytes
)
5785 num_bytes
-= block_rsv
->reserved
;
5786 spin_unlock(&block_rsv
->lock
);
5791 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
5793 block_rsv_add_bytes(block_rsv
, num_bytes
, false);
5800 static void calc_refill_bytes(struct btrfs_block_rsv
*block_rsv
,
5801 u64
*metadata_bytes
, u64
*qgroup_bytes
)
5803 *metadata_bytes
= 0;
5806 spin_lock(&block_rsv
->lock
);
5807 if (block_rsv
->reserved
< block_rsv
->size
)
5808 *metadata_bytes
= block_rsv
->size
- block_rsv
->reserved
;
5809 if (block_rsv
->qgroup_rsv_reserved
< block_rsv
->qgroup_rsv_size
)
5810 *qgroup_bytes
= block_rsv
->qgroup_rsv_size
-
5811 block_rsv
->qgroup_rsv_reserved
;
5812 spin_unlock(&block_rsv
->lock
);
5816 * btrfs_inode_rsv_refill - refill the inode block rsv.
5817 * @inode - the inode we are refilling.
5818 * @flush - the flushing restriction.
5820 * Essentially the same as btrfs_block_rsv_refill, except it uses the
5821 * block_rsv->size as the minimum size. We'll either refill the missing amount
5822 * or return if we already have enough space. This will also handle the reserve
5823 * tracepoint for the reserved amount.
5825 static int btrfs_inode_rsv_refill(struct btrfs_inode
*inode
,
5826 enum btrfs_reserve_flush_enum flush
)
5828 struct btrfs_root
*root
= inode
->root
;
5829 struct btrfs_block_rsv
*block_rsv
= &inode
->block_rsv
;
5830 u64 num_bytes
, last
= 0;
5831 u64 qgroup_num_bytes
;
5834 calc_refill_bytes(block_rsv
, &num_bytes
, &qgroup_num_bytes
);
5839 ret
= btrfs_qgroup_reserve_meta_prealloc(root
, qgroup_num_bytes
,
5843 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
5845 btrfs_qgroup_free_meta_prealloc(root
, qgroup_num_bytes
);
5848 * If we are fragmented we can end up with a lot of
5849 * outstanding extents which will make our size be much
5850 * larger than our reserved amount.
5852 * If the reservation happens here, it might be very
5853 * big though not needed in the end, if the delalloc
5856 * If this is the case try and do the reserve again.
5858 if (flush
== BTRFS_RESERVE_FLUSH_ALL
)
5859 calc_refill_bytes(block_rsv
, &num_bytes
,
5864 } while (ret
&& last
!= num_bytes
);
5867 block_rsv_add_bytes(block_rsv
, num_bytes
, false);
5868 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5869 btrfs_ino(inode
), num_bytes
, 1);
5871 /* Don't forget to increase qgroup_rsv_reserved */
5872 spin_lock(&block_rsv
->lock
);
5873 block_rsv
->qgroup_rsv_reserved
+= qgroup_num_bytes
;
5874 spin_unlock(&block_rsv
->lock
);
5879 static u64
__btrfs_block_rsv_release(struct btrfs_fs_info
*fs_info
,
5880 struct btrfs_block_rsv
*block_rsv
,
5881 u64 num_bytes
, u64
*qgroup_to_release
)
5883 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
5884 struct btrfs_block_rsv
*delayed_rsv
= &fs_info
->delayed_refs_rsv
;
5885 struct btrfs_block_rsv
*target
= delayed_rsv
;
5887 if (target
->full
|| target
== block_rsv
)
5888 target
= global_rsv
;
5890 if (block_rsv
->space_info
!= target
->space_info
)
5893 return block_rsv_release_bytes(fs_info
, block_rsv
, target
, num_bytes
,
5897 void btrfs_block_rsv_release(struct btrfs_fs_info
*fs_info
,
5898 struct btrfs_block_rsv
*block_rsv
,
5901 __btrfs_block_rsv_release(fs_info
, block_rsv
, num_bytes
, NULL
);
5905 * btrfs_inode_rsv_release - release any excessive reservation.
5906 * @inode - the inode we need to release from.
5907 * @qgroup_free - free or convert qgroup meta.
5908 * Unlike normal operation, qgroup meta reservation needs to know if we are
5909 * freeing qgroup reservation or just converting it into per-trans. Normally
5910 * @qgroup_free is true for error handling, and false for normal release.
5912 * This is the same as btrfs_block_rsv_release, except that it handles the
5913 * tracepoint for the reservation.
5915 static void btrfs_inode_rsv_release(struct btrfs_inode
*inode
, bool qgroup_free
)
5917 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
5918 struct btrfs_block_rsv
*block_rsv
= &inode
->block_rsv
;
5920 u64 qgroup_to_release
= 0;
5923 * Since we statically set the block_rsv->size we just want to say we
5924 * are releasing 0 bytes, and then we'll just get the reservation over
5927 released
= __btrfs_block_rsv_release(fs_info
, block_rsv
, 0,
5928 &qgroup_to_release
);
5930 trace_btrfs_space_reservation(fs_info
, "delalloc",
5931 btrfs_ino(inode
), released
, 0);
5933 btrfs_qgroup_free_meta_prealloc(inode
->root
, qgroup_to_release
);
5935 btrfs_qgroup_convert_reserved_meta(inode
->root
,
5940 * btrfs_delayed_refs_rsv_release - release a ref head's reservation.
5941 * @fs_info - the fs_info for our fs.
5942 * @nr - the number of items to drop.
5944 * This drops the delayed ref head's count from the delayed refs rsv and frees
5945 * any excess reservation we had.
5947 void btrfs_delayed_refs_rsv_release(struct btrfs_fs_info
*fs_info
, int nr
)
5949 struct btrfs_block_rsv
*block_rsv
= &fs_info
->delayed_refs_rsv
;
5950 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
5951 u64 num_bytes
= btrfs_calc_trans_metadata_size(fs_info
, nr
);
5954 released
= block_rsv_release_bytes(fs_info
, block_rsv
, global_rsv
,
5957 trace_btrfs_space_reservation(fs_info
, "delayed_refs_rsv",
5961 static void update_global_block_rsv(struct btrfs_fs_info
*fs_info
)
5963 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
5964 struct btrfs_space_info
*sinfo
= block_rsv
->space_info
;
5968 * The global block rsv is based on the size of the extent tree, the
5969 * checksum tree and the root tree. If the fs is empty we want to set
5970 * it to a minimal amount for safety.
5972 num_bytes
= btrfs_root_used(&fs_info
->extent_root
->root_item
) +
5973 btrfs_root_used(&fs_info
->csum_root
->root_item
) +
5974 btrfs_root_used(&fs_info
->tree_root
->root_item
);
5975 num_bytes
= max_t(u64
, num_bytes
, SZ_16M
);
5977 spin_lock(&sinfo
->lock
);
5978 spin_lock(&block_rsv
->lock
);
5980 block_rsv
->size
= min_t(u64
, num_bytes
, SZ_512M
);
5982 if (block_rsv
->reserved
< block_rsv
->size
) {
5983 num_bytes
= btrfs_space_info_used(sinfo
, true);
5984 if (sinfo
->total_bytes
> num_bytes
) {
5985 num_bytes
= sinfo
->total_bytes
- num_bytes
;
5986 num_bytes
= min(num_bytes
,
5987 block_rsv
->size
- block_rsv
->reserved
);
5988 block_rsv
->reserved
+= num_bytes
;
5989 update_bytes_may_use(sinfo
, num_bytes
);
5990 trace_btrfs_space_reservation(fs_info
, "space_info",
5991 sinfo
->flags
, num_bytes
,
5994 } else if (block_rsv
->reserved
> block_rsv
->size
) {
5995 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
5996 update_bytes_may_use(sinfo
, -num_bytes
);
5997 trace_btrfs_space_reservation(fs_info
, "space_info",
5998 sinfo
->flags
, num_bytes
, 0);
5999 block_rsv
->reserved
= block_rsv
->size
;
6002 if (block_rsv
->reserved
== block_rsv
->size
)
6003 block_rsv
->full
= 1;
6005 block_rsv
->full
= 0;
6007 spin_unlock(&block_rsv
->lock
);
6008 spin_unlock(&sinfo
->lock
);
6011 static void init_global_block_rsv(struct btrfs_fs_info
*fs_info
)
6013 struct btrfs_space_info
*space_info
;
6015 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
6016 fs_info
->chunk_block_rsv
.space_info
= space_info
;
6018 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
6019 fs_info
->global_block_rsv
.space_info
= space_info
;
6020 fs_info
->trans_block_rsv
.space_info
= space_info
;
6021 fs_info
->empty_block_rsv
.space_info
= space_info
;
6022 fs_info
->delayed_block_rsv
.space_info
= space_info
;
6023 fs_info
->delayed_refs_rsv
.space_info
= space_info
;
6025 fs_info
->extent_root
->block_rsv
= &fs_info
->delayed_refs_rsv
;
6026 fs_info
->csum_root
->block_rsv
= &fs_info
->delayed_refs_rsv
;
6027 fs_info
->dev_root
->block_rsv
= &fs_info
->global_block_rsv
;
6028 fs_info
->tree_root
->block_rsv
= &fs_info
->global_block_rsv
;
6029 if (fs_info
->quota_root
)
6030 fs_info
->quota_root
->block_rsv
= &fs_info
->global_block_rsv
;
6031 fs_info
->chunk_root
->block_rsv
= &fs_info
->chunk_block_rsv
;
6033 update_global_block_rsv(fs_info
);
6036 static void release_global_block_rsv(struct btrfs_fs_info
*fs_info
)
6038 block_rsv_release_bytes(fs_info
, &fs_info
->global_block_rsv
, NULL
,
6040 WARN_ON(fs_info
->trans_block_rsv
.size
> 0);
6041 WARN_ON(fs_info
->trans_block_rsv
.reserved
> 0);
6042 WARN_ON(fs_info
->chunk_block_rsv
.size
> 0);
6043 WARN_ON(fs_info
->chunk_block_rsv
.reserved
> 0);
6044 WARN_ON(fs_info
->delayed_block_rsv
.size
> 0);
6045 WARN_ON(fs_info
->delayed_block_rsv
.reserved
> 0);
6046 WARN_ON(fs_info
->delayed_refs_rsv
.reserved
> 0);
6047 WARN_ON(fs_info
->delayed_refs_rsv
.size
> 0);
6051 * btrfs_update_delayed_refs_rsv - adjust the size of the delayed refs rsv
6052 * @trans - the trans that may have generated delayed refs
6054 * This is to be called anytime we may have adjusted trans->delayed_ref_updates,
6055 * it'll calculate the additional size and add it to the delayed_refs_rsv.
6057 void btrfs_update_delayed_refs_rsv(struct btrfs_trans_handle
*trans
)
6059 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
6060 struct btrfs_block_rsv
*delayed_rsv
= &fs_info
->delayed_refs_rsv
;
6063 if (!trans
->delayed_ref_updates
)
6066 num_bytes
= btrfs_calc_trans_metadata_size(fs_info
,
6067 trans
->delayed_ref_updates
);
6068 spin_lock(&delayed_rsv
->lock
);
6069 delayed_rsv
->size
+= num_bytes
;
6070 delayed_rsv
->full
= 0;
6071 spin_unlock(&delayed_rsv
->lock
);
6072 trans
->delayed_ref_updates
= 0;
6076 * To be called after all the new block groups attached to the transaction
6077 * handle have been created (btrfs_create_pending_block_groups()).
6079 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle
*trans
)
6081 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
6083 if (!trans
->chunk_bytes_reserved
)
6086 WARN_ON_ONCE(!list_empty(&trans
->new_bgs
));
6088 block_rsv_release_bytes(fs_info
, &fs_info
->chunk_block_rsv
, NULL
,
6089 trans
->chunk_bytes_reserved
, NULL
);
6090 trans
->chunk_bytes_reserved
= 0;
6094 * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation
6095 * root: the root of the parent directory
6096 * rsv: block reservation
6097 * items: the number of items that we need do reservation
6098 * use_global_rsv: allow fallback to the global block reservation
6100 * This function is used to reserve the space for snapshot/subvolume
6101 * creation and deletion. Those operations are different with the
6102 * common file/directory operations, they change two fs/file trees
6103 * and root tree, the number of items that the qgroup reserves is
6104 * different with the free space reservation. So we can not use
6105 * the space reservation mechanism in start_transaction().
6107 int btrfs_subvolume_reserve_metadata(struct btrfs_root
*root
,
6108 struct btrfs_block_rsv
*rsv
, int items
,
6109 bool use_global_rsv
)
6111 u64 qgroup_num_bytes
= 0;
6114 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
6115 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
6117 if (test_bit(BTRFS_FS_QUOTA_ENABLED
, &fs_info
->flags
)) {
6118 /* One for parent inode, two for dir entries */
6119 qgroup_num_bytes
= 3 * fs_info
->nodesize
;
6120 ret
= btrfs_qgroup_reserve_meta_prealloc(root
,
6121 qgroup_num_bytes
, true);
6126 num_bytes
= btrfs_calc_trans_metadata_size(fs_info
, items
);
6127 rsv
->space_info
= __find_space_info(fs_info
,
6128 BTRFS_BLOCK_GROUP_METADATA
);
6129 ret
= btrfs_block_rsv_add(root
, rsv
, num_bytes
,
6130 BTRFS_RESERVE_FLUSH_ALL
);
6132 if (ret
== -ENOSPC
&& use_global_rsv
)
6133 ret
= btrfs_block_rsv_migrate(global_rsv
, rsv
, num_bytes
, true);
6135 if (ret
&& qgroup_num_bytes
)
6136 btrfs_qgroup_free_meta_prealloc(root
, qgroup_num_bytes
);
6141 void btrfs_subvolume_release_metadata(struct btrfs_fs_info
*fs_info
,
6142 struct btrfs_block_rsv
*rsv
)
6144 btrfs_block_rsv_release(fs_info
, rsv
, (u64
)-1);
6147 static void btrfs_calculate_inode_block_rsv_size(struct btrfs_fs_info
*fs_info
,
6148 struct btrfs_inode
*inode
)
6150 struct btrfs_block_rsv
*block_rsv
= &inode
->block_rsv
;
6151 u64 reserve_size
= 0;
6152 u64 qgroup_rsv_size
= 0;
6154 unsigned outstanding_extents
;
6156 lockdep_assert_held(&inode
->lock
);
6157 outstanding_extents
= inode
->outstanding_extents
;
6158 if (outstanding_extents
)
6159 reserve_size
= btrfs_calc_trans_metadata_size(fs_info
,
6160 outstanding_extents
+ 1);
6161 csum_leaves
= btrfs_csum_bytes_to_leaves(fs_info
,
6163 reserve_size
+= btrfs_calc_trans_metadata_size(fs_info
,
6166 * For qgroup rsv, the calculation is very simple:
6167 * account one nodesize for each outstanding extent
6169 * This is overestimating in most cases.
6171 qgroup_rsv_size
= (u64
)outstanding_extents
* fs_info
->nodesize
;
6173 spin_lock(&block_rsv
->lock
);
6174 block_rsv
->size
= reserve_size
;
6175 block_rsv
->qgroup_rsv_size
= qgroup_rsv_size
;
6176 spin_unlock(&block_rsv
->lock
);
6179 int btrfs_delalloc_reserve_metadata(struct btrfs_inode
*inode
, u64 num_bytes
)
6181 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
6182 unsigned nr_extents
;
6183 enum btrfs_reserve_flush_enum flush
= BTRFS_RESERVE_FLUSH_ALL
;
6185 bool delalloc_lock
= true;
6187 /* If we are a free space inode we need to not flush since we will be in
6188 * the middle of a transaction commit. We also don't need the delalloc
6189 * mutex since we won't race with anybody. We need this mostly to make
6190 * lockdep shut its filthy mouth.
6192 * If we have a transaction open (can happen if we call truncate_block
6193 * from truncate), then we need FLUSH_LIMIT so we don't deadlock.
6195 if (btrfs_is_free_space_inode(inode
)) {
6196 flush
= BTRFS_RESERVE_NO_FLUSH
;
6197 delalloc_lock
= false;
6199 if (current
->journal_info
)
6200 flush
= BTRFS_RESERVE_FLUSH_LIMIT
;
6202 if (btrfs_transaction_in_commit(fs_info
))
6203 schedule_timeout(1);
6207 mutex_lock(&inode
->delalloc_mutex
);
6209 num_bytes
= ALIGN(num_bytes
, fs_info
->sectorsize
);
6211 /* Add our new extents and calculate the new rsv size. */
6212 spin_lock(&inode
->lock
);
6213 nr_extents
= count_max_extents(num_bytes
);
6214 btrfs_mod_outstanding_extents(inode
, nr_extents
);
6215 inode
->csum_bytes
+= num_bytes
;
6216 btrfs_calculate_inode_block_rsv_size(fs_info
, inode
);
6217 spin_unlock(&inode
->lock
);
6219 ret
= btrfs_inode_rsv_refill(inode
, flush
);
6224 mutex_unlock(&inode
->delalloc_mutex
);
6228 spin_lock(&inode
->lock
);
6229 nr_extents
= count_max_extents(num_bytes
);
6230 btrfs_mod_outstanding_extents(inode
, -nr_extents
);
6231 inode
->csum_bytes
-= num_bytes
;
6232 btrfs_calculate_inode_block_rsv_size(fs_info
, inode
);
6233 spin_unlock(&inode
->lock
);
6235 btrfs_inode_rsv_release(inode
, true);
6237 mutex_unlock(&inode
->delalloc_mutex
);
6242 * btrfs_delalloc_release_metadata - release a metadata reservation for an inode
6243 * @inode: the inode to release the reservation for.
6244 * @num_bytes: the number of bytes we are releasing.
6245 * @qgroup_free: free qgroup reservation or convert it to per-trans reservation
6247 * This will release the metadata reservation for an inode. This can be called
6248 * once we complete IO for a given set of bytes to release their metadata
6249 * reservations, or on error for the same reason.
6251 void btrfs_delalloc_release_metadata(struct btrfs_inode
*inode
, u64 num_bytes
,
6254 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
6256 num_bytes
= ALIGN(num_bytes
, fs_info
->sectorsize
);
6257 spin_lock(&inode
->lock
);
6258 inode
->csum_bytes
-= num_bytes
;
6259 btrfs_calculate_inode_block_rsv_size(fs_info
, inode
);
6260 spin_unlock(&inode
->lock
);
6262 if (btrfs_is_testing(fs_info
))
6265 btrfs_inode_rsv_release(inode
, qgroup_free
);
6269 * btrfs_delalloc_release_extents - release our outstanding_extents
6270 * @inode: the inode to balance the reservation for.
6271 * @num_bytes: the number of bytes we originally reserved with
6272 * @qgroup_free: do we need to free qgroup meta reservation or convert them.
6274 * When we reserve space we increase outstanding_extents for the extents we may
6275 * add. Once we've set the range as delalloc or created our ordered extents we
6276 * have outstanding_extents to track the real usage, so we use this to free our
6277 * temporarily tracked outstanding_extents. This _must_ be used in conjunction
6278 * with btrfs_delalloc_reserve_metadata.
6280 void btrfs_delalloc_release_extents(struct btrfs_inode
*inode
, u64 num_bytes
,
6283 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
6284 unsigned num_extents
;
6286 spin_lock(&inode
->lock
);
6287 num_extents
= count_max_extents(num_bytes
);
6288 btrfs_mod_outstanding_extents(inode
, -num_extents
);
6289 btrfs_calculate_inode_block_rsv_size(fs_info
, inode
);
6290 spin_unlock(&inode
->lock
);
6292 if (btrfs_is_testing(fs_info
))
6295 btrfs_inode_rsv_release(inode
, qgroup_free
);
6299 * btrfs_delalloc_reserve_space - reserve data and metadata space for
6301 * @inode: inode we're writing to
6302 * @start: start range we are writing to
6303 * @len: how long the range we are writing to
6304 * @reserved: mandatory parameter, record actually reserved qgroup ranges of
6305 * current reservation.
6307 * This will do the following things
6309 * o reserve space in data space info for num bytes
6310 * and reserve precious corresponding qgroup space
6311 * (Done in check_data_free_space)
6313 * o reserve space for metadata space, based on the number of outstanding
6314 * extents and how much csums will be needed
6315 * also reserve metadata space in a per root over-reserve method.
6316 * o add to the inodes->delalloc_bytes
6317 * o add it to the fs_info's delalloc inodes list.
6318 * (Above 3 all done in delalloc_reserve_metadata)
6320 * Return 0 for success
6321 * Return <0 for error(-ENOSPC or -EQUOT)
6323 int btrfs_delalloc_reserve_space(struct inode
*inode
,
6324 struct extent_changeset
**reserved
, u64 start
, u64 len
)
6328 ret
= btrfs_check_data_free_space(inode
, reserved
, start
, len
);
6331 ret
= btrfs_delalloc_reserve_metadata(BTRFS_I(inode
), len
);
6333 btrfs_free_reserved_data_space(inode
, *reserved
, start
, len
);
6338 * btrfs_delalloc_release_space - release data and metadata space for delalloc
6339 * @inode: inode we're releasing space for
6340 * @start: start position of the space already reserved
6341 * @len: the len of the space already reserved
6342 * @release_bytes: the len of the space we consumed or didn't use
6344 * This function will release the metadata space that was not used and will
6345 * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes
6346 * list if there are no delalloc bytes left.
6347 * Also it will handle the qgroup reserved space.
6349 void btrfs_delalloc_release_space(struct inode
*inode
,
6350 struct extent_changeset
*reserved
,
6351 u64 start
, u64 len
, bool qgroup_free
)
6353 btrfs_delalloc_release_metadata(BTRFS_I(inode
), len
, qgroup_free
);
6354 btrfs_free_reserved_data_space(inode
, reserved
, start
, len
);
6357 static int update_block_group(struct btrfs_trans_handle
*trans
,
6358 struct btrfs_fs_info
*info
, u64 bytenr
,
6359 u64 num_bytes
, int alloc
)
6361 struct btrfs_block_group_cache
*cache
= NULL
;
6362 u64 total
= num_bytes
;
6368 /* block accounting for super block */
6369 spin_lock(&info
->delalloc_root_lock
);
6370 old_val
= btrfs_super_bytes_used(info
->super_copy
);
6372 old_val
+= num_bytes
;
6374 old_val
-= num_bytes
;
6375 btrfs_set_super_bytes_used(info
->super_copy
, old_val
);
6376 spin_unlock(&info
->delalloc_root_lock
);
6379 cache
= btrfs_lookup_block_group(info
, bytenr
);
6384 factor
= btrfs_bg_type_to_factor(cache
->flags
);
6387 * If this block group has free space cache written out, we
6388 * need to make sure to load it if we are removing space. This
6389 * is because we need the unpinning stage to actually add the
6390 * space back to the block group, otherwise we will leak space.
6392 if (!alloc
&& cache
->cached
== BTRFS_CACHE_NO
)
6393 cache_block_group(cache
, 1);
6395 byte_in_group
= bytenr
- cache
->key
.objectid
;
6396 WARN_ON(byte_in_group
> cache
->key
.offset
);
6398 spin_lock(&cache
->space_info
->lock
);
6399 spin_lock(&cache
->lock
);
6401 if (btrfs_test_opt(info
, SPACE_CACHE
) &&
6402 cache
->disk_cache_state
< BTRFS_DC_CLEAR
)
6403 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
6405 old_val
= btrfs_block_group_used(&cache
->item
);
6406 num_bytes
= min(total
, cache
->key
.offset
- byte_in_group
);
6408 old_val
+= num_bytes
;
6409 btrfs_set_block_group_used(&cache
->item
, old_val
);
6410 cache
->reserved
-= num_bytes
;
6411 cache
->space_info
->bytes_reserved
-= num_bytes
;
6412 cache
->space_info
->bytes_used
+= num_bytes
;
6413 cache
->space_info
->disk_used
+= num_bytes
* factor
;
6414 spin_unlock(&cache
->lock
);
6415 spin_unlock(&cache
->space_info
->lock
);
6417 old_val
-= num_bytes
;
6418 btrfs_set_block_group_used(&cache
->item
, old_val
);
6419 cache
->pinned
+= num_bytes
;
6420 update_bytes_pinned(cache
->space_info
, num_bytes
);
6421 cache
->space_info
->bytes_used
-= num_bytes
;
6422 cache
->space_info
->disk_used
-= num_bytes
* factor
;
6423 spin_unlock(&cache
->lock
);
6424 spin_unlock(&cache
->space_info
->lock
);
6426 trace_btrfs_space_reservation(info
, "pinned",
6427 cache
->space_info
->flags
,
6429 percpu_counter_add_batch(&cache
->space_info
->total_bytes_pinned
,
6431 BTRFS_TOTAL_BYTES_PINNED_BATCH
);
6432 set_extent_dirty(info
->pinned_extents
,
6433 bytenr
, bytenr
+ num_bytes
- 1,
6434 GFP_NOFS
| __GFP_NOFAIL
);
6437 spin_lock(&trans
->transaction
->dirty_bgs_lock
);
6438 if (list_empty(&cache
->dirty_list
)) {
6439 list_add_tail(&cache
->dirty_list
,
6440 &trans
->transaction
->dirty_bgs
);
6441 trans
->transaction
->num_dirty_bgs
++;
6442 trans
->delayed_ref_updates
++;
6443 btrfs_get_block_group(cache
);
6445 spin_unlock(&trans
->transaction
->dirty_bgs_lock
);
6448 * No longer have used bytes in this block group, queue it for
6449 * deletion. We do this after adding the block group to the
6450 * dirty list to avoid races between cleaner kthread and space
6453 if (!alloc
&& old_val
== 0)
6454 btrfs_mark_bg_unused(cache
);
6456 btrfs_put_block_group(cache
);
6458 bytenr
+= num_bytes
;
6461 /* Modified block groups are accounted for in the delayed_refs_rsv. */
6462 btrfs_update_delayed_refs_rsv(trans
);
6466 static u64
first_logical_byte(struct btrfs_fs_info
*fs_info
, u64 search_start
)
6468 struct btrfs_block_group_cache
*cache
;
6471 spin_lock(&fs_info
->block_group_cache_lock
);
6472 bytenr
= fs_info
->first_logical_byte
;
6473 spin_unlock(&fs_info
->block_group_cache_lock
);
6475 if (bytenr
< (u64
)-1)
6478 cache
= btrfs_lookup_first_block_group(fs_info
, search_start
);
6482 bytenr
= cache
->key
.objectid
;
6483 btrfs_put_block_group(cache
);
6488 static int pin_down_extent(struct btrfs_fs_info
*fs_info
,
6489 struct btrfs_block_group_cache
*cache
,
6490 u64 bytenr
, u64 num_bytes
, int reserved
)
6492 spin_lock(&cache
->space_info
->lock
);
6493 spin_lock(&cache
->lock
);
6494 cache
->pinned
+= num_bytes
;
6495 update_bytes_pinned(cache
->space_info
, num_bytes
);
6497 cache
->reserved
-= num_bytes
;
6498 cache
->space_info
->bytes_reserved
-= num_bytes
;
6500 spin_unlock(&cache
->lock
);
6501 spin_unlock(&cache
->space_info
->lock
);
6503 trace_btrfs_space_reservation(fs_info
, "pinned",
6504 cache
->space_info
->flags
, num_bytes
, 1);
6505 percpu_counter_add_batch(&cache
->space_info
->total_bytes_pinned
,
6506 num_bytes
, BTRFS_TOTAL_BYTES_PINNED_BATCH
);
6507 set_extent_dirty(fs_info
->pinned_extents
, bytenr
,
6508 bytenr
+ num_bytes
- 1, GFP_NOFS
| __GFP_NOFAIL
);
6513 * this function must be called within transaction
6515 int btrfs_pin_extent(struct btrfs_fs_info
*fs_info
,
6516 u64 bytenr
, u64 num_bytes
, int reserved
)
6518 struct btrfs_block_group_cache
*cache
;
6520 cache
= btrfs_lookup_block_group(fs_info
, bytenr
);
6521 BUG_ON(!cache
); /* Logic error */
6523 pin_down_extent(fs_info
, cache
, bytenr
, num_bytes
, reserved
);
6525 btrfs_put_block_group(cache
);
6530 * this function must be called within transaction
6532 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info
*fs_info
,
6533 u64 bytenr
, u64 num_bytes
)
6535 struct btrfs_block_group_cache
*cache
;
6538 cache
= btrfs_lookup_block_group(fs_info
, bytenr
);
6543 * pull in the free space cache (if any) so that our pin
6544 * removes the free space from the cache. We have load_only set
6545 * to one because the slow code to read in the free extents does check
6546 * the pinned extents.
6548 cache_block_group(cache
, 1);
6550 pin_down_extent(fs_info
, cache
, bytenr
, num_bytes
, 0);
6552 /* remove us from the free space cache (if we're there at all) */
6553 ret
= btrfs_remove_free_space(cache
, bytenr
, num_bytes
);
6554 btrfs_put_block_group(cache
);
6558 static int __exclude_logged_extent(struct btrfs_fs_info
*fs_info
,
6559 u64 start
, u64 num_bytes
)
6562 struct btrfs_block_group_cache
*block_group
;
6563 struct btrfs_caching_control
*caching_ctl
;
6565 block_group
= btrfs_lookup_block_group(fs_info
, start
);
6569 cache_block_group(block_group
, 0);
6570 caching_ctl
= get_caching_control(block_group
);
6574 BUG_ON(!block_group_cache_done(block_group
));
6575 ret
= btrfs_remove_free_space(block_group
, start
, num_bytes
);
6577 mutex_lock(&caching_ctl
->mutex
);
6579 if (start
>= caching_ctl
->progress
) {
6580 ret
= add_excluded_extent(fs_info
, start
, num_bytes
);
6581 } else if (start
+ num_bytes
<= caching_ctl
->progress
) {
6582 ret
= btrfs_remove_free_space(block_group
,
6585 num_bytes
= caching_ctl
->progress
- start
;
6586 ret
= btrfs_remove_free_space(block_group
,
6591 num_bytes
= (start
+ num_bytes
) -
6592 caching_ctl
->progress
;
6593 start
= caching_ctl
->progress
;
6594 ret
= add_excluded_extent(fs_info
, start
, num_bytes
);
6597 mutex_unlock(&caching_ctl
->mutex
);
6598 put_caching_control(caching_ctl
);
6600 btrfs_put_block_group(block_group
);
6604 int btrfs_exclude_logged_extents(struct extent_buffer
*eb
)
6606 struct btrfs_fs_info
*fs_info
= eb
->fs_info
;
6607 struct btrfs_file_extent_item
*item
;
6608 struct btrfs_key key
;
6613 if (!btrfs_fs_incompat(fs_info
, MIXED_GROUPS
))
6616 for (i
= 0; i
< btrfs_header_nritems(eb
); i
++) {
6617 btrfs_item_key_to_cpu(eb
, &key
, i
);
6618 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
6620 item
= btrfs_item_ptr(eb
, i
, struct btrfs_file_extent_item
);
6621 found_type
= btrfs_file_extent_type(eb
, item
);
6622 if (found_type
== BTRFS_FILE_EXTENT_INLINE
)
6624 if (btrfs_file_extent_disk_bytenr(eb
, item
) == 0)
6626 key
.objectid
= btrfs_file_extent_disk_bytenr(eb
, item
);
6627 key
.offset
= btrfs_file_extent_disk_num_bytes(eb
, item
);
6628 ret
= __exclude_logged_extent(fs_info
, key
.objectid
, key
.offset
);
6637 btrfs_inc_block_group_reservations(struct btrfs_block_group_cache
*bg
)
6639 atomic_inc(&bg
->reservations
);
6642 void btrfs_dec_block_group_reservations(struct btrfs_fs_info
*fs_info
,
6645 struct btrfs_block_group_cache
*bg
;
6647 bg
= btrfs_lookup_block_group(fs_info
, start
);
6649 if (atomic_dec_and_test(&bg
->reservations
))
6650 wake_up_var(&bg
->reservations
);
6651 btrfs_put_block_group(bg
);
6654 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache
*bg
)
6656 struct btrfs_space_info
*space_info
= bg
->space_info
;
6660 if (!(bg
->flags
& BTRFS_BLOCK_GROUP_DATA
))
6664 * Our block group is read only but before we set it to read only,
6665 * some task might have had allocated an extent from it already, but it
6666 * has not yet created a respective ordered extent (and added it to a
6667 * root's list of ordered extents).
6668 * Therefore wait for any task currently allocating extents, since the
6669 * block group's reservations counter is incremented while a read lock
6670 * on the groups' semaphore is held and decremented after releasing
6671 * the read access on that semaphore and creating the ordered extent.
6673 down_write(&space_info
->groups_sem
);
6674 up_write(&space_info
->groups_sem
);
6676 wait_var_event(&bg
->reservations
, !atomic_read(&bg
->reservations
));
6680 * btrfs_add_reserved_bytes - update the block_group and space info counters
6681 * @cache: The cache we are manipulating
6682 * @ram_bytes: The number of bytes of file content, and will be same to
6683 * @num_bytes except for the compress path.
6684 * @num_bytes: The number of bytes in question
6685 * @delalloc: The blocks are allocated for the delalloc write
6687 * This is called by the allocator when it reserves space. If this is a
6688 * reservation and the block group has become read only we cannot make the
6689 * reservation and return -EAGAIN, otherwise this function always succeeds.
6691 static int btrfs_add_reserved_bytes(struct btrfs_block_group_cache
*cache
,
6692 u64 ram_bytes
, u64 num_bytes
, int delalloc
)
6694 struct btrfs_space_info
*space_info
= cache
->space_info
;
6697 spin_lock(&space_info
->lock
);
6698 spin_lock(&cache
->lock
);
6702 cache
->reserved
+= num_bytes
;
6703 space_info
->bytes_reserved
+= num_bytes
;
6704 update_bytes_may_use(space_info
, -ram_bytes
);
6706 cache
->delalloc_bytes
+= num_bytes
;
6708 spin_unlock(&cache
->lock
);
6709 spin_unlock(&space_info
->lock
);
6714 * btrfs_free_reserved_bytes - update the block_group and space info counters
6715 * @cache: The cache we are manipulating
6716 * @num_bytes: The number of bytes in question
6717 * @delalloc: The blocks are allocated for the delalloc write
6719 * This is called by somebody who is freeing space that was never actually used
6720 * on disk. For example if you reserve some space for a new leaf in transaction
6721 * A and before transaction A commits you free that leaf, you call this with
6722 * reserve set to 0 in order to clear the reservation.
6725 static void btrfs_free_reserved_bytes(struct btrfs_block_group_cache
*cache
,
6726 u64 num_bytes
, int delalloc
)
6728 struct btrfs_space_info
*space_info
= cache
->space_info
;
6730 spin_lock(&space_info
->lock
);
6731 spin_lock(&cache
->lock
);
6733 space_info
->bytes_readonly
+= num_bytes
;
6734 cache
->reserved
-= num_bytes
;
6735 space_info
->bytes_reserved
-= num_bytes
;
6736 space_info
->max_extent_size
= 0;
6739 cache
->delalloc_bytes
-= num_bytes
;
6740 spin_unlock(&cache
->lock
);
6741 spin_unlock(&space_info
->lock
);
6743 void btrfs_prepare_extent_commit(struct btrfs_fs_info
*fs_info
)
6745 struct btrfs_caching_control
*next
;
6746 struct btrfs_caching_control
*caching_ctl
;
6747 struct btrfs_block_group_cache
*cache
;
6749 down_write(&fs_info
->commit_root_sem
);
6751 list_for_each_entry_safe(caching_ctl
, next
,
6752 &fs_info
->caching_block_groups
, list
) {
6753 cache
= caching_ctl
->block_group
;
6754 if (block_group_cache_done(cache
)) {
6755 cache
->last_byte_to_unpin
= (u64
)-1;
6756 list_del_init(&caching_ctl
->list
);
6757 put_caching_control(caching_ctl
);
6759 cache
->last_byte_to_unpin
= caching_ctl
->progress
;
6763 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
6764 fs_info
->pinned_extents
= &fs_info
->freed_extents
[1];
6766 fs_info
->pinned_extents
= &fs_info
->freed_extents
[0];
6768 up_write(&fs_info
->commit_root_sem
);
6770 update_global_block_rsv(fs_info
);
6774 * Returns the free cluster for the given space info and sets empty_cluster to
6775 * what it should be based on the mount options.
6777 static struct btrfs_free_cluster
*
6778 fetch_cluster_info(struct btrfs_fs_info
*fs_info
,
6779 struct btrfs_space_info
*space_info
, u64
*empty_cluster
)
6781 struct btrfs_free_cluster
*ret
= NULL
;
6784 if (btrfs_mixed_space_info(space_info
))
6787 if (space_info
->flags
& BTRFS_BLOCK_GROUP_METADATA
) {
6788 ret
= &fs_info
->meta_alloc_cluster
;
6789 if (btrfs_test_opt(fs_info
, SSD
))
6790 *empty_cluster
= SZ_2M
;
6792 *empty_cluster
= SZ_64K
;
6793 } else if ((space_info
->flags
& BTRFS_BLOCK_GROUP_DATA
) &&
6794 btrfs_test_opt(fs_info
, SSD_SPREAD
)) {
6795 *empty_cluster
= SZ_2M
;
6796 ret
= &fs_info
->data_alloc_cluster
;
6802 static int unpin_extent_range(struct btrfs_fs_info
*fs_info
,
6804 const bool return_free_space
)
6806 struct btrfs_block_group_cache
*cache
= NULL
;
6807 struct btrfs_space_info
*space_info
;
6808 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
6809 struct btrfs_free_cluster
*cluster
= NULL
;
6811 u64 total_unpinned
= 0;
6812 u64 empty_cluster
= 0;
6815 while (start
<= end
) {
6818 start
>= cache
->key
.objectid
+ cache
->key
.offset
) {
6820 btrfs_put_block_group(cache
);
6822 cache
= btrfs_lookup_block_group(fs_info
, start
);
6823 BUG_ON(!cache
); /* Logic error */
6825 cluster
= fetch_cluster_info(fs_info
,
6828 empty_cluster
<<= 1;
6831 len
= cache
->key
.objectid
+ cache
->key
.offset
- start
;
6832 len
= min(len
, end
+ 1 - start
);
6834 if (start
< cache
->last_byte_to_unpin
) {
6835 len
= min(len
, cache
->last_byte_to_unpin
- start
);
6836 if (return_free_space
)
6837 btrfs_add_free_space(cache
, start
, len
);
6841 total_unpinned
+= len
;
6842 space_info
= cache
->space_info
;
6845 * If this space cluster has been marked as fragmented and we've
6846 * unpinned enough in this block group to potentially allow a
6847 * cluster to be created inside of it go ahead and clear the
6850 if (cluster
&& cluster
->fragmented
&&
6851 total_unpinned
> empty_cluster
) {
6852 spin_lock(&cluster
->lock
);
6853 cluster
->fragmented
= 0;
6854 spin_unlock(&cluster
->lock
);
6857 spin_lock(&space_info
->lock
);
6858 spin_lock(&cache
->lock
);
6859 cache
->pinned
-= len
;
6860 update_bytes_pinned(space_info
, -len
);
6862 trace_btrfs_space_reservation(fs_info
, "pinned",
6863 space_info
->flags
, len
, 0);
6864 space_info
->max_extent_size
= 0;
6865 percpu_counter_add_batch(&space_info
->total_bytes_pinned
,
6866 -len
, BTRFS_TOTAL_BYTES_PINNED_BATCH
);
6868 space_info
->bytes_readonly
+= len
;
6871 spin_unlock(&cache
->lock
);
6872 if (!readonly
&& return_free_space
&&
6873 global_rsv
->space_info
== space_info
) {
6876 spin_lock(&global_rsv
->lock
);
6877 if (!global_rsv
->full
) {
6878 to_add
= min(len
, global_rsv
->size
-
6879 global_rsv
->reserved
);
6880 global_rsv
->reserved
+= to_add
;
6881 update_bytes_may_use(space_info
, to_add
);
6882 if (global_rsv
->reserved
>= global_rsv
->size
)
6883 global_rsv
->full
= 1;
6884 trace_btrfs_space_reservation(fs_info
,
6890 spin_unlock(&global_rsv
->lock
);
6891 /* Add to any tickets we may have */
6893 space_info_add_new_bytes(fs_info
, space_info
,
6896 spin_unlock(&space_info
->lock
);
6900 btrfs_put_block_group(cache
);
6904 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
)
6906 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
6907 struct btrfs_block_group_cache
*block_group
, *tmp
;
6908 struct list_head
*deleted_bgs
;
6909 struct extent_io_tree
*unpin
;
6914 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
6915 unpin
= &fs_info
->freed_extents
[1];
6917 unpin
= &fs_info
->freed_extents
[0];
6919 while (!trans
->aborted
) {
6920 struct extent_state
*cached_state
= NULL
;
6922 mutex_lock(&fs_info
->unused_bg_unpin_mutex
);
6923 ret
= find_first_extent_bit(unpin
, 0, &start
, &end
,
6924 EXTENT_DIRTY
, &cached_state
);
6926 mutex_unlock(&fs_info
->unused_bg_unpin_mutex
);
6930 if (btrfs_test_opt(fs_info
, DISCARD
))
6931 ret
= btrfs_discard_extent(fs_info
, start
,
6932 end
+ 1 - start
, NULL
);
6934 clear_extent_dirty(unpin
, start
, end
, &cached_state
);
6935 unpin_extent_range(fs_info
, start
, end
, true);
6936 mutex_unlock(&fs_info
->unused_bg_unpin_mutex
);
6937 free_extent_state(cached_state
);
6942 * Transaction is finished. We don't need the lock anymore. We
6943 * do need to clean up the block groups in case of a transaction
6946 deleted_bgs
= &trans
->transaction
->deleted_bgs
;
6947 list_for_each_entry_safe(block_group
, tmp
, deleted_bgs
, bg_list
) {
6951 if (!trans
->aborted
)
6952 ret
= btrfs_discard_extent(fs_info
,
6953 block_group
->key
.objectid
,
6954 block_group
->key
.offset
,
6957 list_del_init(&block_group
->bg_list
);
6958 btrfs_put_block_group_trimming(block_group
);
6959 btrfs_put_block_group(block_group
);
6962 const char *errstr
= btrfs_decode_error(ret
);
6964 "discard failed while removing blockgroup: errno=%d %s",
6972 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
6973 struct btrfs_delayed_ref_node
*node
, u64 parent
,
6974 u64 root_objectid
, u64 owner_objectid
,
6975 u64 owner_offset
, int refs_to_drop
,
6976 struct btrfs_delayed_extent_op
*extent_op
)
6978 struct btrfs_fs_info
*info
= trans
->fs_info
;
6979 struct btrfs_key key
;
6980 struct btrfs_path
*path
;
6981 struct btrfs_root
*extent_root
= info
->extent_root
;
6982 struct extent_buffer
*leaf
;
6983 struct btrfs_extent_item
*ei
;
6984 struct btrfs_extent_inline_ref
*iref
;
6987 int extent_slot
= 0;
6988 int found_extent
= 0;
6992 u64 bytenr
= node
->bytenr
;
6993 u64 num_bytes
= node
->num_bytes
;
6995 bool skinny_metadata
= btrfs_fs_incompat(info
, SKINNY_METADATA
);
6997 path
= btrfs_alloc_path();
7001 path
->reada
= READA_FORWARD
;
7002 path
->leave_spinning
= 1;
7004 is_data
= owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
;
7005 BUG_ON(!is_data
&& refs_to_drop
!= 1);
7008 skinny_metadata
= false;
7010 ret
= lookup_extent_backref(trans
, path
, &iref
, bytenr
, num_bytes
,
7011 parent
, root_objectid
, owner_objectid
,
7014 extent_slot
= path
->slots
[0];
7015 while (extent_slot
>= 0) {
7016 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
7018 if (key
.objectid
!= bytenr
)
7020 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
7021 key
.offset
== num_bytes
) {
7025 if (key
.type
== BTRFS_METADATA_ITEM_KEY
&&
7026 key
.offset
== owner_objectid
) {
7030 if (path
->slots
[0] - extent_slot
> 5)
7035 if (!found_extent
) {
7037 ret
= remove_extent_backref(trans
, path
, NULL
,
7039 is_data
, &last_ref
);
7041 btrfs_abort_transaction(trans
, ret
);
7044 btrfs_release_path(path
);
7045 path
->leave_spinning
= 1;
7047 key
.objectid
= bytenr
;
7048 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
7049 key
.offset
= num_bytes
;
7051 if (!is_data
&& skinny_metadata
) {
7052 key
.type
= BTRFS_METADATA_ITEM_KEY
;
7053 key
.offset
= owner_objectid
;
7056 ret
= btrfs_search_slot(trans
, extent_root
,
7058 if (ret
> 0 && skinny_metadata
&& path
->slots
[0]) {
7060 * Couldn't find our skinny metadata item,
7061 * see if we have ye olde extent item.
7064 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
7066 if (key
.objectid
== bytenr
&&
7067 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
7068 key
.offset
== num_bytes
)
7072 if (ret
> 0 && skinny_metadata
) {
7073 skinny_metadata
= false;
7074 key
.objectid
= bytenr
;
7075 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
7076 key
.offset
= num_bytes
;
7077 btrfs_release_path(path
);
7078 ret
= btrfs_search_slot(trans
, extent_root
,
7084 "umm, got %d back from search, was looking for %llu",
7087 btrfs_print_leaf(path
->nodes
[0]);
7090 btrfs_abort_transaction(trans
, ret
);
7093 extent_slot
= path
->slots
[0];
7095 } else if (WARN_ON(ret
== -ENOENT
)) {
7096 btrfs_print_leaf(path
->nodes
[0]);
7098 "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu",
7099 bytenr
, parent
, root_objectid
, owner_objectid
,
7101 btrfs_abort_transaction(trans
, ret
);
7104 btrfs_abort_transaction(trans
, ret
);
7108 leaf
= path
->nodes
[0];
7109 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
7110 if (unlikely(item_size
< sizeof(*ei
))) {
7112 btrfs_print_v0_err(info
);
7113 btrfs_abort_transaction(trans
, ret
);
7116 ei
= btrfs_item_ptr(leaf
, extent_slot
,
7117 struct btrfs_extent_item
);
7118 if (owner_objectid
< BTRFS_FIRST_FREE_OBJECTID
&&
7119 key
.type
== BTRFS_EXTENT_ITEM_KEY
) {
7120 struct btrfs_tree_block_info
*bi
;
7121 BUG_ON(item_size
< sizeof(*ei
) + sizeof(*bi
));
7122 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
7123 WARN_ON(owner_objectid
!= btrfs_tree_block_level(leaf
, bi
));
7126 refs
= btrfs_extent_refs(leaf
, ei
);
7127 if (refs
< refs_to_drop
) {
7129 "trying to drop %d refs but we only have %Lu for bytenr %Lu",
7130 refs_to_drop
, refs
, bytenr
);
7132 btrfs_abort_transaction(trans
, ret
);
7135 refs
-= refs_to_drop
;
7139 __run_delayed_extent_op(extent_op
, leaf
, ei
);
7141 * In the case of inline back ref, reference count will
7142 * be updated by remove_extent_backref
7145 BUG_ON(!found_extent
);
7147 btrfs_set_extent_refs(leaf
, ei
, refs
);
7148 btrfs_mark_buffer_dirty(leaf
);
7151 ret
= remove_extent_backref(trans
, path
, iref
,
7152 refs_to_drop
, is_data
,
7155 btrfs_abort_transaction(trans
, ret
);
7161 BUG_ON(is_data
&& refs_to_drop
!=
7162 extent_data_ref_count(path
, iref
));
7164 BUG_ON(path
->slots
[0] != extent_slot
);
7166 BUG_ON(path
->slots
[0] != extent_slot
+ 1);
7167 path
->slots
[0] = extent_slot
;
7173 ret
= btrfs_del_items(trans
, extent_root
, path
, path
->slots
[0],
7176 btrfs_abort_transaction(trans
, ret
);
7179 btrfs_release_path(path
);
7182 ret
= btrfs_del_csums(trans
, info
, bytenr
, num_bytes
);
7184 btrfs_abort_transaction(trans
, ret
);
7189 ret
= add_to_free_space_tree(trans
, bytenr
, num_bytes
);
7191 btrfs_abort_transaction(trans
, ret
);
7195 ret
= update_block_group(trans
, info
, bytenr
, num_bytes
, 0);
7197 btrfs_abort_transaction(trans
, ret
);
7201 btrfs_release_path(path
);
7204 btrfs_free_path(path
);
7209 * when we free an block, it is possible (and likely) that we free the last
7210 * delayed ref for that extent as well. This searches the delayed ref tree for
7211 * a given extent, and if there are no other delayed refs to be processed, it
7212 * removes it from the tree.
7214 static noinline
int check_ref_cleanup(struct btrfs_trans_handle
*trans
,
7217 struct btrfs_delayed_ref_head
*head
;
7218 struct btrfs_delayed_ref_root
*delayed_refs
;
7221 delayed_refs
= &trans
->transaction
->delayed_refs
;
7222 spin_lock(&delayed_refs
->lock
);
7223 head
= btrfs_find_delayed_ref_head(delayed_refs
, bytenr
);
7225 goto out_delayed_unlock
;
7227 spin_lock(&head
->lock
);
7228 if (!RB_EMPTY_ROOT(&head
->ref_tree
.rb_root
))
7231 if (cleanup_extent_op(head
) != NULL
)
7235 * waiting for the lock here would deadlock. If someone else has it
7236 * locked they are already in the process of dropping it anyway
7238 if (!mutex_trylock(&head
->mutex
))
7241 btrfs_delete_ref_head(delayed_refs
, head
);
7242 head
->processing
= 0;
7244 spin_unlock(&head
->lock
);
7245 spin_unlock(&delayed_refs
->lock
);
7247 BUG_ON(head
->extent_op
);
7248 if (head
->must_insert_reserved
)
7251 btrfs_cleanup_ref_head_accounting(trans
->fs_info
, delayed_refs
, head
);
7252 mutex_unlock(&head
->mutex
);
7253 btrfs_put_delayed_ref_head(head
);
7256 spin_unlock(&head
->lock
);
7259 spin_unlock(&delayed_refs
->lock
);
7263 void btrfs_free_tree_block(struct btrfs_trans_handle
*trans
,
7264 struct btrfs_root
*root
,
7265 struct extent_buffer
*buf
,
7266 u64 parent
, int last_ref
)
7268 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
7272 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
7273 int old_ref_mod
, new_ref_mod
;
7275 btrfs_ref_tree_mod(root
, buf
->start
, buf
->len
, parent
,
7276 root
->root_key
.objectid
,
7277 btrfs_header_level(buf
), 0,
7278 BTRFS_DROP_DELAYED_REF
);
7279 ret
= btrfs_add_delayed_tree_ref(trans
, buf
->start
,
7281 root
->root_key
.objectid
,
7282 btrfs_header_level(buf
),
7283 BTRFS_DROP_DELAYED_REF
, NULL
,
7284 &old_ref_mod
, &new_ref_mod
);
7285 BUG_ON(ret
); /* -ENOMEM */
7286 pin
= old_ref_mod
>= 0 && new_ref_mod
< 0;
7289 if (last_ref
&& btrfs_header_generation(buf
) == trans
->transid
) {
7290 struct btrfs_block_group_cache
*cache
;
7292 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
7293 ret
= check_ref_cleanup(trans
, buf
->start
);
7299 cache
= btrfs_lookup_block_group(fs_info
, buf
->start
);
7301 if (btrfs_header_flag(buf
, BTRFS_HEADER_FLAG_WRITTEN
)) {
7302 pin_down_extent(fs_info
, cache
, buf
->start
,
7304 btrfs_put_block_group(cache
);
7308 WARN_ON(test_bit(EXTENT_BUFFER_DIRTY
, &buf
->bflags
));
7310 btrfs_add_free_space(cache
, buf
->start
, buf
->len
);
7311 btrfs_free_reserved_bytes(cache
, buf
->len
, 0);
7312 btrfs_put_block_group(cache
);
7313 trace_btrfs_reserved_extent_free(fs_info
, buf
->start
, buf
->len
);
7317 add_pinned_bytes(fs_info
, buf
->len
, true,
7318 root
->root_key
.objectid
);
7322 * Deleting the buffer, clear the corrupt flag since it doesn't
7325 clear_bit(EXTENT_BUFFER_CORRUPT
, &buf
->bflags
);
7329 /* Can return -ENOMEM */
7330 int btrfs_free_extent(struct btrfs_trans_handle
*trans
,
7331 struct btrfs_root
*root
,
7332 u64 bytenr
, u64 num_bytes
, u64 parent
, u64 root_objectid
,
7333 u64 owner
, u64 offset
)
7335 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
7336 int old_ref_mod
, new_ref_mod
;
7339 if (btrfs_is_testing(fs_info
))
7342 if (root_objectid
!= BTRFS_TREE_LOG_OBJECTID
)
7343 btrfs_ref_tree_mod(root
, bytenr
, num_bytes
, parent
,
7344 root_objectid
, owner
, offset
,
7345 BTRFS_DROP_DELAYED_REF
);
7348 * tree log blocks never actually go into the extent allocation
7349 * tree, just update pinning info and exit early.
7351 if (root_objectid
== BTRFS_TREE_LOG_OBJECTID
) {
7352 WARN_ON(owner
>= BTRFS_FIRST_FREE_OBJECTID
);
7353 /* unlocks the pinned mutex */
7354 btrfs_pin_extent(fs_info
, bytenr
, num_bytes
, 1);
7355 old_ref_mod
= new_ref_mod
= 0;
7357 } else if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
7358 ret
= btrfs_add_delayed_tree_ref(trans
, bytenr
,
7360 root_objectid
, (int)owner
,
7361 BTRFS_DROP_DELAYED_REF
, NULL
,
7362 &old_ref_mod
, &new_ref_mod
);
7364 ret
= btrfs_add_delayed_data_ref(trans
, bytenr
,
7366 root_objectid
, owner
, offset
,
7367 0, BTRFS_DROP_DELAYED_REF
,
7368 &old_ref_mod
, &new_ref_mod
);
7371 if (ret
== 0 && old_ref_mod
>= 0 && new_ref_mod
< 0) {
7372 bool metadata
= owner
< BTRFS_FIRST_FREE_OBJECTID
;
7374 add_pinned_bytes(fs_info
, num_bytes
, metadata
, root_objectid
);
7381 * when we wait for progress in the block group caching, its because
7382 * our allocation attempt failed at least once. So, we must sleep
7383 * and let some progress happen before we try again.
7385 * This function will sleep at least once waiting for new free space to
7386 * show up, and then it will check the block group free space numbers
7387 * for our min num_bytes. Another option is to have it go ahead
7388 * and look in the rbtree for a free extent of a given size, but this
7391 * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using
7392 * any of the information in this block group.
7394 static noinline
void
7395 wait_block_group_cache_progress(struct btrfs_block_group_cache
*cache
,
7398 struct btrfs_caching_control
*caching_ctl
;
7400 caching_ctl
= get_caching_control(cache
);
7404 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
) ||
7405 (cache
->free_space_ctl
->free_space
>= num_bytes
));
7407 put_caching_control(caching_ctl
);
7411 wait_block_group_cache_done(struct btrfs_block_group_cache
*cache
)
7413 struct btrfs_caching_control
*caching_ctl
;
7416 caching_ctl
= get_caching_control(cache
);
7418 return (cache
->cached
== BTRFS_CACHE_ERROR
) ? -EIO
: 0;
7420 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
));
7421 if (cache
->cached
== BTRFS_CACHE_ERROR
)
7423 put_caching_control(caching_ctl
);
7427 enum btrfs_loop_type
{
7428 LOOP_CACHING_NOWAIT
= 0,
7429 LOOP_CACHING_WAIT
= 1,
7430 LOOP_ALLOC_CHUNK
= 2,
7431 LOOP_NO_EMPTY_SIZE
= 3,
7435 btrfs_lock_block_group(struct btrfs_block_group_cache
*cache
,
7439 down_read(&cache
->data_rwsem
);
7443 btrfs_grab_block_group(struct btrfs_block_group_cache
*cache
,
7446 btrfs_get_block_group(cache
);
7448 down_read(&cache
->data_rwsem
);
7451 static struct btrfs_block_group_cache
*
7452 btrfs_lock_cluster(struct btrfs_block_group_cache
*block_group
,
7453 struct btrfs_free_cluster
*cluster
,
7456 struct btrfs_block_group_cache
*used_bg
= NULL
;
7458 spin_lock(&cluster
->refill_lock
);
7460 used_bg
= cluster
->block_group
;
7464 if (used_bg
== block_group
)
7467 btrfs_get_block_group(used_bg
);
7472 if (down_read_trylock(&used_bg
->data_rwsem
))
7475 spin_unlock(&cluster
->refill_lock
);
7477 /* We should only have one-level nested. */
7478 down_read_nested(&used_bg
->data_rwsem
, SINGLE_DEPTH_NESTING
);
7480 spin_lock(&cluster
->refill_lock
);
7481 if (used_bg
== cluster
->block_group
)
7484 up_read(&used_bg
->data_rwsem
);
7485 btrfs_put_block_group(used_bg
);
7490 btrfs_release_block_group(struct btrfs_block_group_cache
*cache
,
7494 up_read(&cache
->data_rwsem
);
7495 btrfs_put_block_group(cache
);
7499 * Structure used internally for find_free_extent() function. Wraps needed
7502 struct find_free_extent_ctl
{
7503 /* Basic allocation info */
7510 /* Where to start the search inside the bg */
7513 /* For clustered allocation */
7516 bool have_caching_bg
;
7517 bool orig_have_caching_bg
;
7519 /* RAID index, converted from flags */
7523 * Current loop number, check find_free_extent_update_loop() for details
7528 * Whether we're refilling a cluster, if true we need to re-search
7529 * current block group but don't try to refill the cluster again.
7531 bool retry_clustered
;
7534 * Whether we're updating free space cache, if true we need to re-search
7535 * current block group but don't try updating free space cache again.
7537 bool retry_unclustered
;
7539 /* If current block group is cached */
7542 /* Max contiguous hole found */
7543 u64 max_extent_size
;
7545 /* Total free space from free space cache, not always contiguous */
7546 u64 total_free_space
;
7554 * Helper function for find_free_extent().
7556 * Return -ENOENT to inform caller that we need fallback to unclustered mode.
7557 * Return -EAGAIN to inform caller that we need to re-search this block group
7558 * Return >0 to inform caller that we find nothing
7559 * Return 0 means we have found a location and set ffe_ctl->found_offset.
7561 static int find_free_extent_clustered(struct btrfs_block_group_cache
*bg
,
7562 struct btrfs_free_cluster
*last_ptr
,
7563 struct find_free_extent_ctl
*ffe_ctl
,
7564 struct btrfs_block_group_cache
**cluster_bg_ret
)
7566 struct btrfs_fs_info
*fs_info
= bg
->fs_info
;
7567 struct btrfs_block_group_cache
*cluster_bg
;
7568 u64 aligned_cluster
;
7572 cluster_bg
= btrfs_lock_cluster(bg
, last_ptr
, ffe_ctl
->delalloc
);
7574 goto refill_cluster
;
7575 if (cluster_bg
!= bg
&& (cluster_bg
->ro
||
7576 !block_group_bits(cluster_bg
, ffe_ctl
->flags
)))
7577 goto release_cluster
;
7579 offset
= btrfs_alloc_from_cluster(cluster_bg
, last_ptr
,
7580 ffe_ctl
->num_bytes
, cluster_bg
->key
.objectid
,
7581 &ffe_ctl
->max_extent_size
);
7583 /* We have a block, we're done */
7584 spin_unlock(&last_ptr
->refill_lock
);
7585 trace_btrfs_reserve_extent_cluster(cluster_bg
,
7586 ffe_ctl
->search_start
, ffe_ctl
->num_bytes
);
7587 *cluster_bg_ret
= cluster_bg
;
7588 ffe_ctl
->found_offset
= offset
;
7591 WARN_ON(last_ptr
->block_group
!= cluster_bg
);
7595 * If we are on LOOP_NO_EMPTY_SIZE, we can't set up a new clusters, so
7596 * lets just skip it and let the allocator find whatever block it can
7597 * find. If we reach this point, we will have tried the cluster
7598 * allocator plenty of times and not have found anything, so we are
7599 * likely way too fragmented for the clustering stuff to find anything.
7601 * However, if the cluster is taken from the current block group,
7602 * release the cluster first, so that we stand a better chance of
7603 * succeeding in the unclustered allocation.
7605 if (ffe_ctl
->loop
>= LOOP_NO_EMPTY_SIZE
&& cluster_bg
!= bg
) {
7606 spin_unlock(&last_ptr
->refill_lock
);
7607 btrfs_release_block_group(cluster_bg
, ffe_ctl
->delalloc
);
7611 /* This cluster didn't work out, free it and start over */
7612 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
7614 if (cluster_bg
!= bg
)
7615 btrfs_release_block_group(cluster_bg
, ffe_ctl
->delalloc
);
7618 if (ffe_ctl
->loop
>= LOOP_NO_EMPTY_SIZE
) {
7619 spin_unlock(&last_ptr
->refill_lock
);
7623 aligned_cluster
= max_t(u64
,
7624 ffe_ctl
->empty_cluster
+ ffe_ctl
->empty_size
,
7625 bg
->full_stripe_len
);
7626 ret
= btrfs_find_space_cluster(fs_info
, bg
, last_ptr
,
7627 ffe_ctl
->search_start
, ffe_ctl
->num_bytes
,
7630 /* Now pull our allocation out of this cluster */
7631 offset
= btrfs_alloc_from_cluster(bg
, last_ptr
,
7632 ffe_ctl
->num_bytes
, ffe_ctl
->search_start
,
7633 &ffe_ctl
->max_extent_size
);
7635 /* We found one, proceed */
7636 spin_unlock(&last_ptr
->refill_lock
);
7637 trace_btrfs_reserve_extent_cluster(bg
,
7638 ffe_ctl
->search_start
,
7639 ffe_ctl
->num_bytes
);
7640 ffe_ctl
->found_offset
= offset
;
7643 } else if (!ffe_ctl
->cached
&& ffe_ctl
->loop
> LOOP_CACHING_NOWAIT
&&
7644 !ffe_ctl
->retry_clustered
) {
7645 spin_unlock(&last_ptr
->refill_lock
);
7647 ffe_ctl
->retry_clustered
= true;
7648 wait_block_group_cache_progress(bg
, ffe_ctl
->num_bytes
+
7649 ffe_ctl
->empty_cluster
+ ffe_ctl
->empty_size
);
7653 * At this point we either didn't find a cluster or we weren't able to
7654 * allocate a block from our cluster. Free the cluster we've been
7655 * trying to use, and go to the next block group.
7657 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
7658 spin_unlock(&last_ptr
->refill_lock
);
7663 * Return >0 to inform caller that we find nothing
7664 * Return 0 when we found an free extent and set ffe_ctrl->found_offset
7665 * Return -EAGAIN to inform caller that we need to re-search this block group
7667 static int find_free_extent_unclustered(struct btrfs_block_group_cache
*bg
,
7668 struct btrfs_free_cluster
*last_ptr
,
7669 struct find_free_extent_ctl
*ffe_ctl
)
7674 * We are doing an unclustered allocation, set the fragmented flag so
7675 * we don't bother trying to setup a cluster again until we get more
7678 if (unlikely(last_ptr
)) {
7679 spin_lock(&last_ptr
->lock
);
7680 last_ptr
->fragmented
= 1;
7681 spin_unlock(&last_ptr
->lock
);
7683 if (ffe_ctl
->cached
) {
7684 struct btrfs_free_space_ctl
*free_space_ctl
;
7686 free_space_ctl
= bg
->free_space_ctl
;
7687 spin_lock(&free_space_ctl
->tree_lock
);
7688 if (free_space_ctl
->free_space
<
7689 ffe_ctl
->num_bytes
+ ffe_ctl
->empty_cluster
+
7690 ffe_ctl
->empty_size
) {
7691 ffe_ctl
->total_free_space
= max_t(u64
,
7692 ffe_ctl
->total_free_space
,
7693 free_space_ctl
->free_space
);
7694 spin_unlock(&free_space_ctl
->tree_lock
);
7697 spin_unlock(&free_space_ctl
->tree_lock
);
7700 offset
= btrfs_find_space_for_alloc(bg
, ffe_ctl
->search_start
,
7701 ffe_ctl
->num_bytes
, ffe_ctl
->empty_size
,
7702 &ffe_ctl
->max_extent_size
);
7705 * If we didn't find a chunk, and we haven't failed on this block group
7706 * before, and this block group is in the middle of caching and we are
7707 * ok with waiting, then go ahead and wait for progress to be made, and
7708 * set @retry_unclustered to true.
7710 * If @retry_unclustered is true then we've already waited on this
7711 * block group once and should move on to the next block group.
7713 if (!offset
&& !ffe_ctl
->retry_unclustered
&& !ffe_ctl
->cached
&&
7714 ffe_ctl
->loop
> LOOP_CACHING_NOWAIT
) {
7715 wait_block_group_cache_progress(bg
, ffe_ctl
->num_bytes
+
7716 ffe_ctl
->empty_size
);
7717 ffe_ctl
->retry_unclustered
= true;
7719 } else if (!offset
) {
7722 ffe_ctl
->found_offset
= offset
;
7727 * Return >0 means caller needs to re-search for free extent
7728 * Return 0 means we have the needed free extent.
7729 * Return <0 means we failed to locate any free extent.
7731 static int find_free_extent_update_loop(struct btrfs_fs_info
*fs_info
,
7732 struct btrfs_free_cluster
*last_ptr
,
7733 struct btrfs_key
*ins
,
7734 struct find_free_extent_ctl
*ffe_ctl
,
7735 int full_search
, bool use_cluster
)
7737 struct btrfs_root
*root
= fs_info
->extent_root
;
7740 if ((ffe_ctl
->loop
== LOOP_CACHING_NOWAIT
) &&
7741 ffe_ctl
->have_caching_bg
&& !ffe_ctl
->orig_have_caching_bg
)
7742 ffe_ctl
->orig_have_caching_bg
= true;
7744 if (!ins
->objectid
&& ffe_ctl
->loop
>= LOOP_CACHING_WAIT
&&
7745 ffe_ctl
->have_caching_bg
)
7748 if (!ins
->objectid
&& ++(ffe_ctl
->index
) < BTRFS_NR_RAID_TYPES
)
7751 if (ins
->objectid
) {
7752 if (!use_cluster
&& last_ptr
) {
7753 spin_lock(&last_ptr
->lock
);
7754 last_ptr
->window_start
= ins
->objectid
;
7755 spin_unlock(&last_ptr
->lock
);
7761 * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking
7762 * caching kthreads as we move along
7763 * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching
7764 * LOOP_ALLOC_CHUNK, force a chunk allocation and try again
7765 * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
7768 if (ffe_ctl
->loop
< LOOP_NO_EMPTY_SIZE
) {
7770 if (ffe_ctl
->loop
== LOOP_CACHING_NOWAIT
) {
7772 * We want to skip the LOOP_CACHING_WAIT step if we
7773 * don't have any uncached bgs and we've already done a
7774 * full search through.
7776 if (ffe_ctl
->orig_have_caching_bg
|| !full_search
)
7777 ffe_ctl
->loop
= LOOP_CACHING_WAIT
;
7779 ffe_ctl
->loop
= LOOP_ALLOC_CHUNK
;
7784 if (ffe_ctl
->loop
== LOOP_ALLOC_CHUNK
) {
7785 struct btrfs_trans_handle
*trans
;
7788 trans
= current
->journal_info
;
7792 trans
= btrfs_join_transaction(root
);
7794 if (IS_ERR(trans
)) {
7795 ret
= PTR_ERR(trans
);
7799 ret
= do_chunk_alloc(trans
, ffe_ctl
->flags
,
7803 * If we can't allocate a new chunk we've already looped
7804 * through at least once, move on to the NO_EMPTY_SIZE
7808 ffe_ctl
->loop
= LOOP_NO_EMPTY_SIZE
;
7810 /* Do not bail out on ENOSPC since we can do more. */
7811 if (ret
< 0 && ret
!= -ENOSPC
)
7812 btrfs_abort_transaction(trans
, ret
);
7816 btrfs_end_transaction(trans
);
7821 if (ffe_ctl
->loop
== LOOP_NO_EMPTY_SIZE
) {
7823 * Don't loop again if we already have no empty_size and
7826 if (ffe_ctl
->empty_size
== 0 &&
7827 ffe_ctl
->empty_cluster
== 0)
7829 ffe_ctl
->empty_size
= 0;
7830 ffe_ctl
->empty_cluster
= 0;
7838 * walks the btree of allocated extents and find a hole of a given size.
7839 * The key ins is changed to record the hole:
7840 * ins->objectid == start position
7841 * ins->flags = BTRFS_EXTENT_ITEM_KEY
7842 * ins->offset == the size of the hole.
7843 * Any available blocks before search_start are skipped.
7845 * If there is no suitable free space, we will record the max size of
7846 * the free space extent currently.
7848 * The overall logic and call chain:
7850 * find_free_extent()
7851 * |- Iterate through all block groups
7852 * | |- Get a valid block group
7853 * | |- Try to do clustered allocation in that block group
7854 * | |- Try to do unclustered allocation in that block group
7855 * | |- Check if the result is valid
7856 * | | |- If valid, then exit
7857 * | |- Jump to next block group
7859 * |- Push harder to find free extents
7860 * |- If not found, re-iterate all block groups
7862 static noinline
int find_free_extent(struct btrfs_fs_info
*fs_info
,
7863 u64 ram_bytes
, u64 num_bytes
, u64 empty_size
,
7864 u64 hint_byte
, struct btrfs_key
*ins
,
7865 u64 flags
, int delalloc
)
7868 struct btrfs_free_cluster
*last_ptr
= NULL
;
7869 struct btrfs_block_group_cache
*block_group
= NULL
;
7870 struct find_free_extent_ctl ffe_ctl
= {0};
7871 struct btrfs_space_info
*space_info
;
7872 bool use_cluster
= true;
7873 bool full_search
= false;
7875 WARN_ON(num_bytes
< fs_info
->sectorsize
);
7877 ffe_ctl
.ram_bytes
= ram_bytes
;
7878 ffe_ctl
.num_bytes
= num_bytes
;
7879 ffe_ctl
.empty_size
= empty_size
;
7880 ffe_ctl
.flags
= flags
;
7881 ffe_ctl
.search_start
= 0;
7882 ffe_ctl
.retry_clustered
= false;
7883 ffe_ctl
.retry_unclustered
= false;
7884 ffe_ctl
.delalloc
= delalloc
;
7885 ffe_ctl
.index
= btrfs_bg_flags_to_raid_index(flags
);
7886 ffe_ctl
.have_caching_bg
= false;
7887 ffe_ctl
.orig_have_caching_bg
= false;
7888 ffe_ctl
.found_offset
= 0;
7890 ins
->type
= BTRFS_EXTENT_ITEM_KEY
;
7894 trace_find_free_extent(fs_info
, num_bytes
, empty_size
, flags
);
7896 space_info
= __find_space_info(fs_info
, flags
);
7898 btrfs_err(fs_info
, "No space info for %llu", flags
);
7903 * If our free space is heavily fragmented we may not be able to make
7904 * big contiguous allocations, so instead of doing the expensive search
7905 * for free space, simply return ENOSPC with our max_extent_size so we
7906 * can go ahead and search for a more manageable chunk.
7908 * If our max_extent_size is large enough for our allocation simply
7909 * disable clustering since we will likely not be able to find enough
7910 * space to create a cluster and induce latency trying.
7912 if (unlikely(space_info
->max_extent_size
)) {
7913 spin_lock(&space_info
->lock
);
7914 if (space_info
->max_extent_size
&&
7915 num_bytes
> space_info
->max_extent_size
) {
7916 ins
->offset
= space_info
->max_extent_size
;
7917 spin_unlock(&space_info
->lock
);
7919 } else if (space_info
->max_extent_size
) {
7920 use_cluster
= false;
7922 spin_unlock(&space_info
->lock
);
7925 last_ptr
= fetch_cluster_info(fs_info
, space_info
,
7926 &ffe_ctl
.empty_cluster
);
7928 spin_lock(&last_ptr
->lock
);
7929 if (last_ptr
->block_group
)
7930 hint_byte
= last_ptr
->window_start
;
7931 if (last_ptr
->fragmented
) {
7933 * We still set window_start so we can keep track of the
7934 * last place we found an allocation to try and save
7937 hint_byte
= last_ptr
->window_start
;
7938 use_cluster
= false;
7940 spin_unlock(&last_ptr
->lock
);
7943 ffe_ctl
.search_start
= max(ffe_ctl
.search_start
,
7944 first_logical_byte(fs_info
, 0));
7945 ffe_ctl
.search_start
= max(ffe_ctl
.search_start
, hint_byte
);
7946 if (ffe_ctl
.search_start
== hint_byte
) {
7947 block_group
= btrfs_lookup_block_group(fs_info
,
7948 ffe_ctl
.search_start
);
7950 * we don't want to use the block group if it doesn't match our
7951 * allocation bits, or if its not cached.
7953 * However if we are re-searching with an ideal block group
7954 * picked out then we don't care that the block group is cached.
7956 if (block_group
&& block_group_bits(block_group
, flags
) &&
7957 block_group
->cached
!= BTRFS_CACHE_NO
) {
7958 down_read(&space_info
->groups_sem
);
7959 if (list_empty(&block_group
->list
) ||
7962 * someone is removing this block group,
7963 * we can't jump into the have_block_group
7964 * target because our list pointers are not
7967 btrfs_put_block_group(block_group
);
7968 up_read(&space_info
->groups_sem
);
7970 ffe_ctl
.index
= btrfs_bg_flags_to_raid_index(
7971 block_group
->flags
);
7972 btrfs_lock_block_group(block_group
, delalloc
);
7973 goto have_block_group
;
7975 } else if (block_group
) {
7976 btrfs_put_block_group(block_group
);
7980 ffe_ctl
.have_caching_bg
= false;
7981 if (ffe_ctl
.index
== btrfs_bg_flags_to_raid_index(flags
) ||
7984 down_read(&space_info
->groups_sem
);
7985 list_for_each_entry(block_group
,
7986 &space_info
->block_groups
[ffe_ctl
.index
], list
) {
7987 /* If the block group is read-only, we can skip it entirely. */
7988 if (unlikely(block_group
->ro
))
7991 btrfs_grab_block_group(block_group
, delalloc
);
7992 ffe_ctl
.search_start
= block_group
->key
.objectid
;
7995 * this can happen if we end up cycling through all the
7996 * raid types, but we want to make sure we only allocate
7997 * for the proper type.
7999 if (!block_group_bits(block_group
, flags
)) {
8000 u64 extra
= BTRFS_BLOCK_GROUP_DUP
|
8001 BTRFS_BLOCK_GROUP_RAID1
|
8002 BTRFS_BLOCK_GROUP_RAID5
|
8003 BTRFS_BLOCK_GROUP_RAID6
|
8004 BTRFS_BLOCK_GROUP_RAID10
;
8007 * if they asked for extra copies and this block group
8008 * doesn't provide them, bail. This does allow us to
8009 * fill raid0 from raid1.
8011 if ((flags
& extra
) && !(block_group
->flags
& extra
))
8016 ffe_ctl
.cached
= block_group_cache_done(block_group
);
8017 if (unlikely(!ffe_ctl
.cached
)) {
8018 ffe_ctl
.have_caching_bg
= true;
8019 ret
= cache_block_group(block_group
, 0);
8024 if (unlikely(block_group
->cached
== BTRFS_CACHE_ERROR
))
8028 * Ok we want to try and use the cluster allocator, so
8031 if (last_ptr
&& use_cluster
) {
8032 struct btrfs_block_group_cache
*cluster_bg
= NULL
;
8034 ret
= find_free_extent_clustered(block_group
, last_ptr
,
8035 &ffe_ctl
, &cluster_bg
);
8038 if (cluster_bg
&& cluster_bg
!= block_group
) {
8039 btrfs_release_block_group(block_group
,
8041 block_group
= cluster_bg
;
8044 } else if (ret
== -EAGAIN
) {
8045 goto have_block_group
;
8046 } else if (ret
> 0) {
8049 /* ret == -ENOENT case falls through */
8052 ret
= find_free_extent_unclustered(block_group
, last_ptr
,
8055 goto have_block_group
;
8058 /* ret == 0 case falls through */
8060 ffe_ctl
.search_start
= round_up(ffe_ctl
.found_offset
,
8061 fs_info
->stripesize
);
8063 /* move on to the next group */
8064 if (ffe_ctl
.search_start
+ num_bytes
>
8065 block_group
->key
.objectid
+ block_group
->key
.offset
) {
8066 btrfs_add_free_space(block_group
, ffe_ctl
.found_offset
,
8071 if (ffe_ctl
.found_offset
< ffe_ctl
.search_start
)
8072 btrfs_add_free_space(block_group
, ffe_ctl
.found_offset
,
8073 ffe_ctl
.search_start
- ffe_ctl
.found_offset
);
8075 ret
= btrfs_add_reserved_bytes(block_group
, ram_bytes
,
8076 num_bytes
, delalloc
);
8077 if (ret
== -EAGAIN
) {
8078 btrfs_add_free_space(block_group
, ffe_ctl
.found_offset
,
8082 btrfs_inc_block_group_reservations(block_group
);
8084 /* we are all good, lets return */
8085 ins
->objectid
= ffe_ctl
.search_start
;
8086 ins
->offset
= num_bytes
;
8088 trace_btrfs_reserve_extent(block_group
, ffe_ctl
.search_start
,
8090 btrfs_release_block_group(block_group
, delalloc
);
8093 ffe_ctl
.retry_clustered
= false;
8094 ffe_ctl
.retry_unclustered
= false;
8095 BUG_ON(btrfs_bg_flags_to_raid_index(block_group
->flags
) !=
8097 btrfs_release_block_group(block_group
, delalloc
);
8100 up_read(&space_info
->groups_sem
);
8102 ret
= find_free_extent_update_loop(fs_info
, last_ptr
, ins
, &ffe_ctl
,
8103 full_search
, use_cluster
);
8107 if (ret
== -ENOSPC
) {
8109 * Use ffe_ctl->total_free_space as fallback if we can't find
8110 * any contiguous hole.
8112 if (!ffe_ctl
.max_extent_size
)
8113 ffe_ctl
.max_extent_size
= ffe_ctl
.total_free_space
;
8114 spin_lock(&space_info
->lock
);
8115 space_info
->max_extent_size
= ffe_ctl
.max_extent_size
;
8116 spin_unlock(&space_info
->lock
);
8117 ins
->offset
= ffe_ctl
.max_extent_size
;
8122 #define DUMP_BLOCK_RSV(fs_info, rsv_name) \
8124 struct btrfs_block_rsv *__rsv = &(fs_info)->rsv_name; \
8125 spin_lock(&__rsv->lock); \
8126 btrfs_info(fs_info, #rsv_name ": size %llu reserved %llu", \
8127 __rsv->size, __rsv->reserved); \
8128 spin_unlock(&__rsv->lock); \
8131 static void dump_space_info(struct btrfs_fs_info
*fs_info
,
8132 struct btrfs_space_info
*info
, u64 bytes
,
8133 int dump_block_groups
)
8135 struct btrfs_block_group_cache
*cache
;
8138 spin_lock(&info
->lock
);
8139 btrfs_info(fs_info
, "space_info %llu has %llu free, is %sfull",
8141 info
->total_bytes
- btrfs_space_info_used(info
, true),
8142 info
->full
? "" : "not ");
8144 "space_info total=%llu, used=%llu, pinned=%llu, reserved=%llu, may_use=%llu, readonly=%llu",
8145 info
->total_bytes
, info
->bytes_used
, info
->bytes_pinned
,
8146 info
->bytes_reserved
, info
->bytes_may_use
,
8147 info
->bytes_readonly
);
8148 spin_unlock(&info
->lock
);
8150 DUMP_BLOCK_RSV(fs_info
, global_block_rsv
);
8151 DUMP_BLOCK_RSV(fs_info
, trans_block_rsv
);
8152 DUMP_BLOCK_RSV(fs_info
, chunk_block_rsv
);
8153 DUMP_BLOCK_RSV(fs_info
, delayed_block_rsv
);
8154 DUMP_BLOCK_RSV(fs_info
, delayed_refs_rsv
);
8156 if (!dump_block_groups
)
8159 down_read(&info
->groups_sem
);
8161 list_for_each_entry(cache
, &info
->block_groups
[index
], list
) {
8162 spin_lock(&cache
->lock
);
8164 "block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s",
8165 cache
->key
.objectid
, cache
->key
.offset
,
8166 btrfs_block_group_used(&cache
->item
), cache
->pinned
,
8167 cache
->reserved
, cache
->ro
? "[readonly]" : "");
8168 btrfs_dump_free_space(cache
, bytes
);
8169 spin_unlock(&cache
->lock
);
8171 if (++index
< BTRFS_NR_RAID_TYPES
)
8173 up_read(&info
->groups_sem
);
8177 * btrfs_reserve_extent - entry point to the extent allocator. Tries to find a
8178 * hole that is at least as big as @num_bytes.
8180 * @root - The root that will contain this extent
8182 * @ram_bytes - The amount of space in ram that @num_bytes take. This
8183 * is used for accounting purposes. This value differs
8184 * from @num_bytes only in the case of compressed extents.
8186 * @num_bytes - Number of bytes to allocate on-disk.
8188 * @min_alloc_size - Indicates the minimum amount of space that the
8189 * allocator should try to satisfy. In some cases
8190 * @num_bytes may be larger than what is required and if
8191 * the filesystem is fragmented then allocation fails.
8192 * However, the presence of @min_alloc_size gives a
8193 * chance to try and satisfy the smaller allocation.
8195 * @empty_size - A hint that you plan on doing more COW. This is the
8196 * size in bytes the allocator should try to find free
8197 * next to the block it returns. This is just a hint and
8198 * may be ignored by the allocator.
8200 * @hint_byte - Hint to the allocator to start searching above the byte
8201 * address passed. It might be ignored.
8203 * @ins - This key is modified to record the found hole. It will
8204 * have the following values:
8205 * ins->objectid == start position
8206 * ins->flags = BTRFS_EXTENT_ITEM_KEY
8207 * ins->offset == the size of the hole.
8209 * @is_data - Boolean flag indicating whether an extent is
8210 * allocated for data (true) or metadata (false)
8212 * @delalloc - Boolean flag indicating whether this allocation is for
8213 * delalloc or not. If 'true' data_rwsem of block groups
8214 * is going to be acquired.
8217 * Returns 0 when an allocation succeeded or < 0 when an error occurred. In
8218 * case -ENOSPC is returned then @ins->offset will contain the size of the
8219 * largest available hole the allocator managed to find.
8221 int btrfs_reserve_extent(struct btrfs_root
*root
, u64 ram_bytes
,
8222 u64 num_bytes
, u64 min_alloc_size
,
8223 u64 empty_size
, u64 hint_byte
,
8224 struct btrfs_key
*ins
, int is_data
, int delalloc
)
8226 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
8227 bool final_tried
= num_bytes
== min_alloc_size
;
8231 flags
= get_alloc_profile_by_root(root
, is_data
);
8233 WARN_ON(num_bytes
< fs_info
->sectorsize
);
8234 ret
= find_free_extent(fs_info
, ram_bytes
, num_bytes
, empty_size
,
8235 hint_byte
, ins
, flags
, delalloc
);
8236 if (!ret
&& !is_data
) {
8237 btrfs_dec_block_group_reservations(fs_info
, ins
->objectid
);
8238 } else if (ret
== -ENOSPC
) {
8239 if (!final_tried
&& ins
->offset
) {
8240 num_bytes
= min(num_bytes
>> 1, ins
->offset
);
8241 num_bytes
= round_down(num_bytes
,
8242 fs_info
->sectorsize
);
8243 num_bytes
= max(num_bytes
, min_alloc_size
);
8244 ram_bytes
= num_bytes
;
8245 if (num_bytes
== min_alloc_size
)
8248 } else if (btrfs_test_opt(fs_info
, ENOSPC_DEBUG
)) {
8249 struct btrfs_space_info
*sinfo
;
8251 sinfo
= __find_space_info(fs_info
, flags
);
8253 "allocation failed flags %llu, wanted %llu",
8256 dump_space_info(fs_info
, sinfo
, num_bytes
, 1);
8263 static int __btrfs_free_reserved_extent(struct btrfs_fs_info
*fs_info
,
8265 int pin
, int delalloc
)
8267 struct btrfs_block_group_cache
*cache
;
8270 cache
= btrfs_lookup_block_group(fs_info
, start
);
8272 btrfs_err(fs_info
, "Unable to find block group for %llu",
8278 pin_down_extent(fs_info
, cache
, start
, len
, 1);
8280 if (btrfs_test_opt(fs_info
, DISCARD
))
8281 ret
= btrfs_discard_extent(fs_info
, start
, len
, NULL
);
8282 btrfs_add_free_space(cache
, start
, len
);
8283 btrfs_free_reserved_bytes(cache
, len
, delalloc
);
8284 trace_btrfs_reserved_extent_free(fs_info
, start
, len
);
8287 btrfs_put_block_group(cache
);
8291 int btrfs_free_reserved_extent(struct btrfs_fs_info
*fs_info
,
8292 u64 start
, u64 len
, int delalloc
)
8294 return __btrfs_free_reserved_extent(fs_info
, start
, len
, 0, delalloc
);
8297 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info
*fs_info
,
8300 return __btrfs_free_reserved_extent(fs_info
, start
, len
, 1, 0);
8303 static int alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
8304 u64 parent
, u64 root_objectid
,
8305 u64 flags
, u64 owner
, u64 offset
,
8306 struct btrfs_key
*ins
, int ref_mod
)
8308 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
8310 struct btrfs_extent_item
*extent_item
;
8311 struct btrfs_extent_inline_ref
*iref
;
8312 struct btrfs_path
*path
;
8313 struct extent_buffer
*leaf
;
8318 type
= BTRFS_SHARED_DATA_REF_KEY
;
8320 type
= BTRFS_EXTENT_DATA_REF_KEY
;
8322 size
= sizeof(*extent_item
) + btrfs_extent_inline_ref_size(type
);
8324 path
= btrfs_alloc_path();
8328 path
->leave_spinning
= 1;
8329 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
8332 btrfs_free_path(path
);
8336 leaf
= path
->nodes
[0];
8337 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
8338 struct btrfs_extent_item
);
8339 btrfs_set_extent_refs(leaf
, extent_item
, ref_mod
);
8340 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
8341 btrfs_set_extent_flags(leaf
, extent_item
,
8342 flags
| BTRFS_EXTENT_FLAG_DATA
);
8344 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
8345 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
8347 struct btrfs_shared_data_ref
*ref
;
8348 ref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
8349 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
8350 btrfs_set_shared_data_ref_count(leaf
, ref
, ref_mod
);
8352 struct btrfs_extent_data_ref
*ref
;
8353 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
8354 btrfs_set_extent_data_ref_root(leaf
, ref
, root_objectid
);
8355 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
8356 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
8357 btrfs_set_extent_data_ref_count(leaf
, ref
, ref_mod
);
8360 btrfs_mark_buffer_dirty(path
->nodes
[0]);
8361 btrfs_free_path(path
);
8363 ret
= remove_from_free_space_tree(trans
, ins
->objectid
, ins
->offset
);
8367 ret
= update_block_group(trans
, fs_info
, ins
->objectid
, ins
->offset
, 1);
8368 if (ret
) { /* -ENOENT, logic error */
8369 btrfs_err(fs_info
, "update block group failed for %llu %llu",
8370 ins
->objectid
, ins
->offset
);
8373 trace_btrfs_reserved_extent_alloc(fs_info
, ins
->objectid
, ins
->offset
);
8377 static int alloc_reserved_tree_block(struct btrfs_trans_handle
*trans
,
8378 struct btrfs_delayed_ref_node
*node
,
8379 struct btrfs_delayed_extent_op
*extent_op
)
8381 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
8383 struct btrfs_extent_item
*extent_item
;
8384 struct btrfs_key extent_key
;
8385 struct btrfs_tree_block_info
*block_info
;
8386 struct btrfs_extent_inline_ref
*iref
;
8387 struct btrfs_path
*path
;
8388 struct extent_buffer
*leaf
;
8389 struct btrfs_delayed_tree_ref
*ref
;
8390 u32 size
= sizeof(*extent_item
) + sizeof(*iref
);
8392 u64 flags
= extent_op
->flags_to_set
;
8393 bool skinny_metadata
= btrfs_fs_incompat(fs_info
, SKINNY_METADATA
);
8395 ref
= btrfs_delayed_node_to_tree_ref(node
);
8397 extent_key
.objectid
= node
->bytenr
;
8398 if (skinny_metadata
) {
8399 extent_key
.offset
= ref
->level
;
8400 extent_key
.type
= BTRFS_METADATA_ITEM_KEY
;
8401 num_bytes
= fs_info
->nodesize
;
8403 extent_key
.offset
= node
->num_bytes
;
8404 extent_key
.type
= BTRFS_EXTENT_ITEM_KEY
;
8405 size
+= sizeof(*block_info
);
8406 num_bytes
= node
->num_bytes
;
8409 path
= btrfs_alloc_path();
8413 path
->leave_spinning
= 1;
8414 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
8417 btrfs_free_path(path
);
8421 leaf
= path
->nodes
[0];
8422 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
8423 struct btrfs_extent_item
);
8424 btrfs_set_extent_refs(leaf
, extent_item
, 1);
8425 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
8426 btrfs_set_extent_flags(leaf
, extent_item
,
8427 flags
| BTRFS_EXTENT_FLAG_TREE_BLOCK
);
8429 if (skinny_metadata
) {
8430 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
8432 block_info
= (struct btrfs_tree_block_info
*)(extent_item
+ 1);
8433 btrfs_set_tree_block_key(leaf
, block_info
, &extent_op
->key
);
8434 btrfs_set_tree_block_level(leaf
, block_info
, ref
->level
);
8435 iref
= (struct btrfs_extent_inline_ref
*)(block_info
+ 1);
8438 if (node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
) {
8439 BUG_ON(!(flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
));
8440 btrfs_set_extent_inline_ref_type(leaf
, iref
,
8441 BTRFS_SHARED_BLOCK_REF_KEY
);
8442 btrfs_set_extent_inline_ref_offset(leaf
, iref
, ref
->parent
);
8444 btrfs_set_extent_inline_ref_type(leaf
, iref
,
8445 BTRFS_TREE_BLOCK_REF_KEY
);
8446 btrfs_set_extent_inline_ref_offset(leaf
, iref
, ref
->root
);
8449 btrfs_mark_buffer_dirty(leaf
);
8450 btrfs_free_path(path
);
8452 ret
= remove_from_free_space_tree(trans
, extent_key
.objectid
,
8457 ret
= update_block_group(trans
, fs_info
, extent_key
.objectid
,
8458 fs_info
->nodesize
, 1);
8459 if (ret
) { /* -ENOENT, logic error */
8460 btrfs_err(fs_info
, "update block group failed for %llu %llu",
8461 extent_key
.objectid
, extent_key
.offset
);
8465 trace_btrfs_reserved_extent_alloc(fs_info
, extent_key
.objectid
,
8470 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
8471 struct btrfs_root
*root
, u64 owner
,
8472 u64 offset
, u64 ram_bytes
,
8473 struct btrfs_key
*ins
)
8477 BUG_ON(root
->root_key
.objectid
== BTRFS_TREE_LOG_OBJECTID
);
8479 btrfs_ref_tree_mod(root
, ins
->objectid
, ins
->offset
, 0,
8480 root
->root_key
.objectid
, owner
, offset
,
8481 BTRFS_ADD_DELAYED_EXTENT
);
8483 ret
= btrfs_add_delayed_data_ref(trans
, ins
->objectid
,
8485 root
->root_key
.objectid
, owner
,
8487 BTRFS_ADD_DELAYED_EXTENT
, NULL
, NULL
);
8492 * this is used by the tree logging recovery code. It records that
8493 * an extent has been allocated and makes sure to clear the free
8494 * space cache bits as well
8496 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle
*trans
,
8497 u64 root_objectid
, u64 owner
, u64 offset
,
8498 struct btrfs_key
*ins
)
8500 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
8502 struct btrfs_block_group_cache
*block_group
;
8503 struct btrfs_space_info
*space_info
;
8506 * Mixed block groups will exclude before processing the log so we only
8507 * need to do the exclude dance if this fs isn't mixed.
8509 if (!btrfs_fs_incompat(fs_info
, MIXED_GROUPS
)) {
8510 ret
= __exclude_logged_extent(fs_info
, ins
->objectid
,
8516 block_group
= btrfs_lookup_block_group(fs_info
, ins
->objectid
);
8520 space_info
= block_group
->space_info
;
8521 spin_lock(&space_info
->lock
);
8522 spin_lock(&block_group
->lock
);
8523 space_info
->bytes_reserved
+= ins
->offset
;
8524 block_group
->reserved
+= ins
->offset
;
8525 spin_unlock(&block_group
->lock
);
8526 spin_unlock(&space_info
->lock
);
8528 ret
= alloc_reserved_file_extent(trans
, 0, root_objectid
, 0, owner
,
8530 btrfs_put_block_group(block_group
);
8534 static struct extent_buffer
*
8535 btrfs_init_new_buffer(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
8536 u64 bytenr
, int level
, u64 owner
)
8538 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
8539 struct extent_buffer
*buf
;
8541 buf
= btrfs_find_create_tree_block(fs_info
, bytenr
);
8546 * Extra safety check in case the extent tree is corrupted and extent
8547 * allocator chooses to use a tree block which is already used and
8550 if (buf
->lock_owner
== current
->pid
) {
8551 btrfs_err_rl(fs_info
,
8552 "tree block %llu owner %llu already locked by pid=%d, extent tree corruption detected",
8553 buf
->start
, btrfs_header_owner(buf
), current
->pid
);
8554 free_extent_buffer(buf
);
8555 return ERR_PTR(-EUCLEAN
);
8558 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, buf
, level
);
8559 btrfs_tree_lock(buf
);
8560 btrfs_clean_tree_block(buf
);
8561 clear_bit(EXTENT_BUFFER_STALE
, &buf
->bflags
);
8563 btrfs_set_lock_blocking_write(buf
);
8564 set_extent_buffer_uptodate(buf
);
8566 memzero_extent_buffer(buf
, 0, sizeof(struct btrfs_header
));
8567 btrfs_set_header_level(buf
, level
);
8568 btrfs_set_header_bytenr(buf
, buf
->start
);
8569 btrfs_set_header_generation(buf
, trans
->transid
);
8570 btrfs_set_header_backref_rev(buf
, BTRFS_MIXED_BACKREF_REV
);
8571 btrfs_set_header_owner(buf
, owner
);
8572 write_extent_buffer_fsid(buf
, fs_info
->fs_devices
->metadata_uuid
);
8573 write_extent_buffer_chunk_tree_uuid(buf
, fs_info
->chunk_tree_uuid
);
8574 if (root
->root_key
.objectid
== BTRFS_TREE_LOG_OBJECTID
) {
8575 buf
->log_index
= root
->log_transid
% 2;
8577 * we allow two log transactions at a time, use different
8578 * EXTENT bit to differentiate dirty pages.
8580 if (buf
->log_index
== 0)
8581 set_extent_dirty(&root
->dirty_log_pages
, buf
->start
,
8582 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
8584 set_extent_new(&root
->dirty_log_pages
, buf
->start
,
8585 buf
->start
+ buf
->len
- 1);
8587 buf
->log_index
= -1;
8588 set_extent_dirty(&trans
->transaction
->dirty_pages
, buf
->start
,
8589 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
8591 trans
->dirty
= true;
8592 /* this returns a buffer locked for blocking */
8596 static struct btrfs_block_rsv
*
8597 use_block_rsv(struct btrfs_trans_handle
*trans
,
8598 struct btrfs_root
*root
, u32 blocksize
)
8600 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
8601 struct btrfs_block_rsv
*block_rsv
;
8602 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
8604 bool global_updated
= false;
8606 block_rsv
= get_block_rsv(trans
, root
);
8608 if (unlikely(block_rsv
->size
== 0))
8611 ret
= block_rsv_use_bytes(block_rsv
, blocksize
);
8615 if (block_rsv
->failfast
)
8616 return ERR_PTR(ret
);
8618 if (block_rsv
->type
== BTRFS_BLOCK_RSV_GLOBAL
&& !global_updated
) {
8619 global_updated
= true;
8620 update_global_block_rsv(fs_info
);
8625 * The global reserve still exists to save us from ourselves, so don't
8626 * warn_on if we are short on our delayed refs reserve.
8628 if (block_rsv
->type
!= BTRFS_BLOCK_RSV_DELREFS
&&
8629 btrfs_test_opt(fs_info
, ENOSPC_DEBUG
)) {
8630 static DEFINE_RATELIMIT_STATE(_rs
,
8631 DEFAULT_RATELIMIT_INTERVAL
* 10,
8632 /*DEFAULT_RATELIMIT_BURST*/ 1);
8633 if (__ratelimit(&_rs
))
8635 "BTRFS: block rsv returned %d\n", ret
);
8638 ret
= reserve_metadata_bytes(root
, block_rsv
, blocksize
,
8639 BTRFS_RESERVE_NO_FLUSH
);
8643 * If we couldn't reserve metadata bytes try and use some from
8644 * the global reserve if its space type is the same as the global
8647 if (block_rsv
->type
!= BTRFS_BLOCK_RSV_GLOBAL
&&
8648 block_rsv
->space_info
== global_rsv
->space_info
) {
8649 ret
= block_rsv_use_bytes(global_rsv
, blocksize
);
8653 return ERR_PTR(ret
);
8656 static void unuse_block_rsv(struct btrfs_fs_info
*fs_info
,
8657 struct btrfs_block_rsv
*block_rsv
, u32 blocksize
)
8659 block_rsv_add_bytes(block_rsv
, blocksize
, false);
8660 block_rsv_release_bytes(fs_info
, block_rsv
, NULL
, 0, NULL
);
8664 * finds a free extent and does all the dirty work required for allocation
8665 * returns the tree buffer or an ERR_PTR on error.
8667 struct extent_buffer
*btrfs_alloc_tree_block(struct btrfs_trans_handle
*trans
,
8668 struct btrfs_root
*root
,
8669 u64 parent
, u64 root_objectid
,
8670 const struct btrfs_disk_key
*key
,
8671 int level
, u64 hint
,
8674 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
8675 struct btrfs_key ins
;
8676 struct btrfs_block_rsv
*block_rsv
;
8677 struct extent_buffer
*buf
;
8678 struct btrfs_delayed_extent_op
*extent_op
;
8681 u32 blocksize
= fs_info
->nodesize
;
8682 bool skinny_metadata
= btrfs_fs_incompat(fs_info
, SKINNY_METADATA
);
8684 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
8685 if (btrfs_is_testing(fs_info
)) {
8686 buf
= btrfs_init_new_buffer(trans
, root
, root
->alloc_bytenr
,
8687 level
, root_objectid
);
8689 root
->alloc_bytenr
+= blocksize
;
8694 block_rsv
= use_block_rsv(trans
, root
, blocksize
);
8695 if (IS_ERR(block_rsv
))
8696 return ERR_CAST(block_rsv
);
8698 ret
= btrfs_reserve_extent(root
, blocksize
, blocksize
, blocksize
,
8699 empty_size
, hint
, &ins
, 0, 0);
8703 buf
= btrfs_init_new_buffer(trans
, root
, ins
.objectid
, level
,
8707 goto out_free_reserved
;
8710 if (root_objectid
== BTRFS_TREE_RELOC_OBJECTID
) {
8712 parent
= ins
.objectid
;
8713 flags
|= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
8717 if (root_objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
8718 extent_op
= btrfs_alloc_delayed_extent_op();
8724 memcpy(&extent_op
->key
, key
, sizeof(extent_op
->key
));
8726 memset(&extent_op
->key
, 0, sizeof(extent_op
->key
));
8727 extent_op
->flags_to_set
= flags
;
8728 extent_op
->update_key
= skinny_metadata
? false : true;
8729 extent_op
->update_flags
= true;
8730 extent_op
->is_data
= false;
8731 extent_op
->level
= level
;
8733 btrfs_ref_tree_mod(root
, ins
.objectid
, ins
.offset
, parent
,
8734 root_objectid
, level
, 0,
8735 BTRFS_ADD_DELAYED_EXTENT
);
8736 ret
= btrfs_add_delayed_tree_ref(trans
, ins
.objectid
,
8738 root_objectid
, level
,
8739 BTRFS_ADD_DELAYED_EXTENT
,
8740 extent_op
, NULL
, NULL
);
8742 goto out_free_delayed
;
8747 btrfs_free_delayed_extent_op(extent_op
);
8749 free_extent_buffer(buf
);
8751 btrfs_free_reserved_extent(fs_info
, ins
.objectid
, ins
.offset
, 0);
8753 unuse_block_rsv(fs_info
, block_rsv
, blocksize
);
8754 return ERR_PTR(ret
);
8757 struct walk_control
{
8758 u64 refs
[BTRFS_MAX_LEVEL
];
8759 u64 flags
[BTRFS_MAX_LEVEL
];
8760 struct btrfs_key update_progress
;
8761 struct btrfs_key drop_progress
;
8773 #define DROP_REFERENCE 1
8774 #define UPDATE_BACKREF 2
8776 static noinline
void reada_walk_down(struct btrfs_trans_handle
*trans
,
8777 struct btrfs_root
*root
,
8778 struct walk_control
*wc
,
8779 struct btrfs_path
*path
)
8781 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
8787 struct btrfs_key key
;
8788 struct extent_buffer
*eb
;
8793 if (path
->slots
[wc
->level
] < wc
->reada_slot
) {
8794 wc
->reada_count
= wc
->reada_count
* 2 / 3;
8795 wc
->reada_count
= max(wc
->reada_count
, 2);
8797 wc
->reada_count
= wc
->reada_count
* 3 / 2;
8798 wc
->reada_count
= min_t(int, wc
->reada_count
,
8799 BTRFS_NODEPTRS_PER_BLOCK(fs_info
));
8802 eb
= path
->nodes
[wc
->level
];
8803 nritems
= btrfs_header_nritems(eb
);
8805 for (slot
= path
->slots
[wc
->level
]; slot
< nritems
; slot
++) {
8806 if (nread
>= wc
->reada_count
)
8810 bytenr
= btrfs_node_blockptr(eb
, slot
);
8811 generation
= btrfs_node_ptr_generation(eb
, slot
);
8813 if (slot
== path
->slots
[wc
->level
])
8816 if (wc
->stage
== UPDATE_BACKREF
&&
8817 generation
<= root
->root_key
.offset
)
8820 /* We don't lock the tree block, it's OK to be racy here */
8821 ret
= btrfs_lookup_extent_info(trans
, fs_info
, bytenr
,
8822 wc
->level
- 1, 1, &refs
,
8824 /* We don't care about errors in readahead. */
8829 if (wc
->stage
== DROP_REFERENCE
) {
8833 if (wc
->level
== 1 &&
8834 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
8836 if (!wc
->update_ref
||
8837 generation
<= root
->root_key
.offset
)
8839 btrfs_node_key_to_cpu(eb
, &key
, slot
);
8840 ret
= btrfs_comp_cpu_keys(&key
,
8841 &wc
->update_progress
);
8845 if (wc
->level
== 1 &&
8846 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
8850 readahead_tree_block(fs_info
, bytenr
);
8853 wc
->reada_slot
= slot
;
8857 * helper to process tree block while walking down the tree.
8859 * when wc->stage == UPDATE_BACKREF, this function updates
8860 * back refs for pointers in the block.
8862 * NOTE: return value 1 means we should stop walking down.
8864 static noinline
int walk_down_proc(struct btrfs_trans_handle
*trans
,
8865 struct btrfs_root
*root
,
8866 struct btrfs_path
*path
,
8867 struct walk_control
*wc
, int lookup_info
)
8869 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
8870 int level
= wc
->level
;
8871 struct extent_buffer
*eb
= path
->nodes
[level
];
8872 u64 flag
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
8875 if (wc
->stage
== UPDATE_BACKREF
&&
8876 btrfs_header_owner(eb
) != root
->root_key
.objectid
)
8880 * when reference count of tree block is 1, it won't increase
8881 * again. once full backref flag is set, we never clear it.
8884 ((wc
->stage
== DROP_REFERENCE
&& wc
->refs
[level
] != 1) ||
8885 (wc
->stage
== UPDATE_BACKREF
&& !(wc
->flags
[level
] & flag
)))) {
8886 BUG_ON(!path
->locks
[level
]);
8887 ret
= btrfs_lookup_extent_info(trans
, fs_info
,
8888 eb
->start
, level
, 1,
8891 BUG_ON(ret
== -ENOMEM
);
8894 BUG_ON(wc
->refs
[level
] == 0);
8897 if (wc
->stage
== DROP_REFERENCE
) {
8898 if (wc
->refs
[level
] > 1)
8901 if (path
->locks
[level
] && !wc
->keep_locks
) {
8902 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
8903 path
->locks
[level
] = 0;
8908 /* wc->stage == UPDATE_BACKREF */
8909 if (!(wc
->flags
[level
] & flag
)) {
8910 BUG_ON(!path
->locks
[level
]);
8911 ret
= btrfs_inc_ref(trans
, root
, eb
, 1);
8912 BUG_ON(ret
); /* -ENOMEM */
8913 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
8914 BUG_ON(ret
); /* -ENOMEM */
8915 ret
= btrfs_set_disk_extent_flags(trans
, fs_info
, eb
->start
,
8917 btrfs_header_level(eb
), 0);
8918 BUG_ON(ret
); /* -ENOMEM */
8919 wc
->flags
[level
] |= flag
;
8923 * the block is shared by multiple trees, so it's not good to
8924 * keep the tree lock
8926 if (path
->locks
[level
] && level
> 0) {
8927 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
8928 path
->locks
[level
] = 0;
8934 * This is used to verify a ref exists for this root to deal with a bug where we
8935 * would have a drop_progress key that hadn't been updated properly.
8937 static int check_ref_exists(struct btrfs_trans_handle
*trans
,
8938 struct btrfs_root
*root
, u64 bytenr
, u64 parent
,
8941 struct btrfs_path
*path
;
8942 struct btrfs_extent_inline_ref
*iref
;
8945 path
= btrfs_alloc_path();
8949 ret
= lookup_extent_backref(trans
, path
, &iref
, bytenr
,
8950 root
->fs_info
->nodesize
, parent
,
8951 root
->root_key
.objectid
, level
, 0);
8952 btrfs_free_path(path
);
8961 * helper to process tree block pointer.
8963 * when wc->stage == DROP_REFERENCE, this function checks
8964 * reference count of the block pointed to. if the block
8965 * is shared and we need update back refs for the subtree
8966 * rooted at the block, this function changes wc->stage to
8967 * UPDATE_BACKREF. if the block is shared and there is no
8968 * need to update back, this function drops the reference
8971 * NOTE: return value 1 means we should stop walking down.
8973 static noinline
int do_walk_down(struct btrfs_trans_handle
*trans
,
8974 struct btrfs_root
*root
,
8975 struct btrfs_path
*path
,
8976 struct walk_control
*wc
, int *lookup_info
)
8978 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
8982 struct btrfs_key key
;
8983 struct btrfs_key first_key
;
8984 struct extent_buffer
*next
;
8985 int level
= wc
->level
;
8988 bool need_account
= false;
8990 generation
= btrfs_node_ptr_generation(path
->nodes
[level
],
8991 path
->slots
[level
]);
8993 * if the lower level block was created before the snapshot
8994 * was created, we know there is no need to update back refs
8997 if (wc
->stage
== UPDATE_BACKREF
&&
8998 generation
<= root
->root_key
.offset
) {
9003 bytenr
= btrfs_node_blockptr(path
->nodes
[level
], path
->slots
[level
]);
9004 btrfs_node_key_to_cpu(path
->nodes
[level
], &first_key
,
9005 path
->slots
[level
]);
9007 next
= find_extent_buffer(fs_info
, bytenr
);
9009 next
= btrfs_find_create_tree_block(fs_info
, bytenr
);
9011 return PTR_ERR(next
);
9013 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, next
,
9017 btrfs_tree_lock(next
);
9018 btrfs_set_lock_blocking_write(next
);
9020 ret
= btrfs_lookup_extent_info(trans
, fs_info
, bytenr
, level
- 1, 1,
9021 &wc
->refs
[level
- 1],
9022 &wc
->flags
[level
- 1]);
9026 if (unlikely(wc
->refs
[level
- 1] == 0)) {
9027 btrfs_err(fs_info
, "Missing references.");
9033 if (wc
->stage
== DROP_REFERENCE
) {
9034 if (wc
->refs
[level
- 1] > 1) {
9035 need_account
= true;
9037 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
9040 if (!wc
->update_ref
||
9041 generation
<= root
->root_key
.offset
)
9044 btrfs_node_key_to_cpu(path
->nodes
[level
], &key
,
9045 path
->slots
[level
]);
9046 ret
= btrfs_comp_cpu_keys(&key
, &wc
->update_progress
);
9050 wc
->stage
= UPDATE_BACKREF
;
9051 wc
->shared_level
= level
- 1;
9055 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
9059 if (!btrfs_buffer_uptodate(next
, generation
, 0)) {
9060 btrfs_tree_unlock(next
);
9061 free_extent_buffer(next
);
9067 if (reada
&& level
== 1)
9068 reada_walk_down(trans
, root
, wc
, path
);
9069 next
= read_tree_block(fs_info
, bytenr
, generation
, level
- 1,
9072 return PTR_ERR(next
);
9073 } else if (!extent_buffer_uptodate(next
)) {
9074 free_extent_buffer(next
);
9077 btrfs_tree_lock(next
);
9078 btrfs_set_lock_blocking_write(next
);
9082 ASSERT(level
== btrfs_header_level(next
));
9083 if (level
!= btrfs_header_level(next
)) {
9084 btrfs_err(root
->fs_info
, "mismatched level");
9088 path
->nodes
[level
] = next
;
9089 path
->slots
[level
] = 0;
9090 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
9096 wc
->refs
[level
- 1] = 0;
9097 wc
->flags
[level
- 1] = 0;
9098 if (wc
->stage
== DROP_REFERENCE
) {
9099 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
) {
9100 parent
= path
->nodes
[level
]->start
;
9102 ASSERT(root
->root_key
.objectid
==
9103 btrfs_header_owner(path
->nodes
[level
]));
9104 if (root
->root_key
.objectid
!=
9105 btrfs_header_owner(path
->nodes
[level
])) {
9106 btrfs_err(root
->fs_info
,
9107 "mismatched block owner");
9115 * If we had a drop_progress we need to verify the refs are set
9116 * as expected. If we find our ref then we know that from here
9117 * on out everything should be correct, and we can clear the
9120 if (wc
->restarted
) {
9121 ret
= check_ref_exists(trans
, root
, bytenr
, parent
,
9132 * Reloc tree doesn't contribute to qgroup numbers, and we have
9133 * already accounted them at merge time (replace_path),
9134 * thus we could skip expensive subtree trace here.
9136 if (root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
&&
9138 ret
= btrfs_qgroup_trace_subtree(trans
, next
,
9139 generation
, level
- 1);
9141 btrfs_err_rl(fs_info
,
9142 "Error %d accounting shared subtree. Quota is out of sync, rescan required.",
9148 * We need to update the next key in our walk control so we can
9149 * update the drop_progress key accordingly. We don't care if
9150 * find_next_key doesn't find a key because that means we're at
9151 * the end and are going to clean up now.
9153 wc
->drop_level
= level
;
9154 find_next_key(path
, level
, &wc
->drop_progress
);
9156 ret
= btrfs_free_extent(trans
, root
, bytenr
, fs_info
->nodesize
,
9157 parent
, root
->root_key
.objectid
,
9167 btrfs_tree_unlock(next
);
9168 free_extent_buffer(next
);
9174 * helper to process tree block while walking up the tree.
9176 * when wc->stage == DROP_REFERENCE, this function drops
9177 * reference count on the block.
9179 * when wc->stage == UPDATE_BACKREF, this function changes
9180 * wc->stage back to DROP_REFERENCE if we changed wc->stage
9181 * to UPDATE_BACKREF previously while processing the block.
9183 * NOTE: return value 1 means we should stop walking up.
9185 static noinline
int walk_up_proc(struct btrfs_trans_handle
*trans
,
9186 struct btrfs_root
*root
,
9187 struct btrfs_path
*path
,
9188 struct walk_control
*wc
)
9190 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
9192 int level
= wc
->level
;
9193 struct extent_buffer
*eb
= path
->nodes
[level
];
9196 if (wc
->stage
== UPDATE_BACKREF
) {
9197 BUG_ON(wc
->shared_level
< level
);
9198 if (level
< wc
->shared_level
)
9201 ret
= find_next_key(path
, level
+ 1, &wc
->update_progress
);
9205 wc
->stage
= DROP_REFERENCE
;
9206 wc
->shared_level
= -1;
9207 path
->slots
[level
] = 0;
9210 * check reference count again if the block isn't locked.
9211 * we should start walking down the tree again if reference
9214 if (!path
->locks
[level
]) {
9216 btrfs_tree_lock(eb
);
9217 btrfs_set_lock_blocking_write(eb
);
9218 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
9220 ret
= btrfs_lookup_extent_info(trans
, fs_info
,
9221 eb
->start
, level
, 1,
9225 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
9226 path
->locks
[level
] = 0;
9229 BUG_ON(wc
->refs
[level
] == 0);
9230 if (wc
->refs
[level
] == 1) {
9231 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
9232 path
->locks
[level
] = 0;
9238 /* wc->stage == DROP_REFERENCE */
9239 BUG_ON(wc
->refs
[level
] > 1 && !path
->locks
[level
]);
9241 if (wc
->refs
[level
] == 1) {
9243 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
9244 ret
= btrfs_dec_ref(trans
, root
, eb
, 1);
9246 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
9247 BUG_ON(ret
); /* -ENOMEM */
9248 ret
= btrfs_qgroup_trace_leaf_items(trans
, eb
);
9250 btrfs_err_rl(fs_info
,
9251 "error %d accounting leaf items. Quota is out of sync, rescan required.",
9255 /* make block locked assertion in btrfs_clean_tree_block happy */
9256 if (!path
->locks
[level
] &&
9257 btrfs_header_generation(eb
) == trans
->transid
) {
9258 btrfs_tree_lock(eb
);
9259 btrfs_set_lock_blocking_write(eb
);
9260 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
9262 btrfs_clean_tree_block(eb
);
9265 if (eb
== root
->node
) {
9266 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
9268 else if (root
->root_key
.objectid
!= btrfs_header_owner(eb
))
9269 goto owner_mismatch
;
9271 if (wc
->flags
[level
+ 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
9272 parent
= path
->nodes
[level
+ 1]->start
;
9273 else if (root
->root_key
.objectid
!=
9274 btrfs_header_owner(path
->nodes
[level
+ 1]))
9275 goto owner_mismatch
;
9278 btrfs_free_tree_block(trans
, root
, eb
, parent
, wc
->refs
[level
] == 1);
9280 wc
->refs
[level
] = 0;
9281 wc
->flags
[level
] = 0;
9285 btrfs_err_rl(fs_info
, "unexpected tree owner, have %llu expect %llu",
9286 btrfs_header_owner(eb
), root
->root_key
.objectid
);
9290 static noinline
int walk_down_tree(struct btrfs_trans_handle
*trans
,
9291 struct btrfs_root
*root
,
9292 struct btrfs_path
*path
,
9293 struct walk_control
*wc
)
9295 int level
= wc
->level
;
9296 int lookup_info
= 1;
9299 while (level
>= 0) {
9300 ret
= walk_down_proc(trans
, root
, path
, wc
, lookup_info
);
9307 if (path
->slots
[level
] >=
9308 btrfs_header_nritems(path
->nodes
[level
]))
9311 ret
= do_walk_down(trans
, root
, path
, wc
, &lookup_info
);
9313 path
->slots
[level
]++;
9322 static noinline
int walk_up_tree(struct btrfs_trans_handle
*trans
,
9323 struct btrfs_root
*root
,
9324 struct btrfs_path
*path
,
9325 struct walk_control
*wc
, int max_level
)
9327 int level
= wc
->level
;
9330 path
->slots
[level
] = btrfs_header_nritems(path
->nodes
[level
]);
9331 while (level
< max_level
&& path
->nodes
[level
]) {
9333 if (path
->slots
[level
] + 1 <
9334 btrfs_header_nritems(path
->nodes
[level
])) {
9335 path
->slots
[level
]++;
9338 ret
= walk_up_proc(trans
, root
, path
, wc
);
9344 if (path
->locks
[level
]) {
9345 btrfs_tree_unlock_rw(path
->nodes
[level
],
9346 path
->locks
[level
]);
9347 path
->locks
[level
] = 0;
9349 free_extent_buffer(path
->nodes
[level
]);
9350 path
->nodes
[level
] = NULL
;
9358 * drop a subvolume tree.
9360 * this function traverses the tree freeing any blocks that only
9361 * referenced by the tree.
9363 * when a shared tree block is found. this function decreases its
9364 * reference count by one. if update_ref is true, this function
9365 * also make sure backrefs for the shared block and all lower level
9366 * blocks are properly updated.
9368 * If called with for_reloc == 0, may exit early with -EAGAIN
9370 int btrfs_drop_snapshot(struct btrfs_root
*root
,
9371 struct btrfs_block_rsv
*block_rsv
, int update_ref
,
9374 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
9375 struct btrfs_path
*path
;
9376 struct btrfs_trans_handle
*trans
;
9377 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
9378 struct btrfs_root_item
*root_item
= &root
->root_item
;
9379 struct walk_control
*wc
;
9380 struct btrfs_key key
;
9384 bool root_dropped
= false;
9386 btrfs_debug(fs_info
, "Drop subvolume %llu", root
->root_key
.objectid
);
9388 path
= btrfs_alloc_path();
9394 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
9396 btrfs_free_path(path
);
9401 trans
= btrfs_start_transaction(tree_root
, 0);
9402 if (IS_ERR(trans
)) {
9403 err
= PTR_ERR(trans
);
9407 err
= btrfs_run_delayed_items(trans
);
9412 trans
->block_rsv
= block_rsv
;
9415 * This will help us catch people modifying the fs tree while we're
9416 * dropping it. It is unsafe to mess with the fs tree while it's being
9417 * dropped as we unlock the root node and parent nodes as we walk down
9418 * the tree, assuming nothing will change. If something does change
9419 * then we'll have stale information and drop references to blocks we've
9422 set_bit(BTRFS_ROOT_DELETING
, &root
->state
);
9423 if (btrfs_disk_key_objectid(&root_item
->drop_progress
) == 0) {
9424 level
= btrfs_header_level(root
->node
);
9425 path
->nodes
[level
] = btrfs_lock_root_node(root
);
9426 btrfs_set_lock_blocking_write(path
->nodes
[level
]);
9427 path
->slots
[level
] = 0;
9428 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
9429 memset(&wc
->update_progress
, 0,
9430 sizeof(wc
->update_progress
));
9432 btrfs_disk_key_to_cpu(&key
, &root_item
->drop_progress
);
9433 memcpy(&wc
->update_progress
, &key
,
9434 sizeof(wc
->update_progress
));
9436 level
= root_item
->drop_level
;
9438 path
->lowest_level
= level
;
9439 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
9440 path
->lowest_level
= 0;
9448 * unlock our path, this is safe because only this
9449 * function is allowed to delete this snapshot
9451 btrfs_unlock_up_safe(path
, 0);
9453 level
= btrfs_header_level(root
->node
);
9455 btrfs_tree_lock(path
->nodes
[level
]);
9456 btrfs_set_lock_blocking_write(path
->nodes
[level
]);
9457 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
9459 ret
= btrfs_lookup_extent_info(trans
, fs_info
,
9460 path
->nodes
[level
]->start
,
9461 level
, 1, &wc
->refs
[level
],
9467 BUG_ON(wc
->refs
[level
] == 0);
9469 if (level
== root_item
->drop_level
)
9472 btrfs_tree_unlock(path
->nodes
[level
]);
9473 path
->locks
[level
] = 0;
9474 WARN_ON(wc
->refs
[level
] != 1);
9479 wc
->restarted
= test_bit(BTRFS_ROOT_DEAD_TREE
, &root
->state
);
9481 wc
->shared_level
= -1;
9482 wc
->stage
= DROP_REFERENCE
;
9483 wc
->update_ref
= update_ref
;
9485 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(fs_info
);
9489 ret
= walk_down_tree(trans
, root
, path
, wc
);
9495 ret
= walk_up_tree(trans
, root
, path
, wc
, BTRFS_MAX_LEVEL
);
9502 BUG_ON(wc
->stage
!= DROP_REFERENCE
);
9506 if (wc
->stage
== DROP_REFERENCE
) {
9507 wc
->drop_level
= wc
->level
;
9508 btrfs_node_key_to_cpu(path
->nodes
[wc
->drop_level
],
9510 path
->slots
[wc
->drop_level
]);
9512 btrfs_cpu_key_to_disk(&root_item
->drop_progress
,
9513 &wc
->drop_progress
);
9514 root_item
->drop_level
= wc
->drop_level
;
9516 BUG_ON(wc
->level
== 0);
9517 if (btrfs_should_end_transaction(trans
) ||
9518 (!for_reloc
&& btrfs_need_cleaner_sleep(fs_info
))) {
9519 ret
= btrfs_update_root(trans
, tree_root
,
9523 btrfs_abort_transaction(trans
, ret
);
9528 btrfs_end_transaction_throttle(trans
);
9529 if (!for_reloc
&& btrfs_need_cleaner_sleep(fs_info
)) {
9530 btrfs_debug(fs_info
,
9531 "drop snapshot early exit");
9536 trans
= btrfs_start_transaction(tree_root
, 0);
9537 if (IS_ERR(trans
)) {
9538 err
= PTR_ERR(trans
);
9542 trans
->block_rsv
= block_rsv
;
9545 btrfs_release_path(path
);
9549 ret
= btrfs_del_root(trans
, &root
->root_key
);
9551 btrfs_abort_transaction(trans
, ret
);
9556 if (root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
) {
9557 ret
= btrfs_find_root(tree_root
, &root
->root_key
, path
,
9560 btrfs_abort_transaction(trans
, ret
);
9563 } else if (ret
> 0) {
9564 /* if we fail to delete the orphan item this time
9565 * around, it'll get picked up the next time.
9567 * The most common failure here is just -ENOENT.
9569 btrfs_del_orphan_item(trans
, tree_root
,
9570 root
->root_key
.objectid
);
9574 if (test_bit(BTRFS_ROOT_IN_RADIX
, &root
->state
)) {
9575 btrfs_add_dropped_root(trans
, root
);
9577 free_extent_buffer(root
->node
);
9578 free_extent_buffer(root
->commit_root
);
9579 btrfs_put_fs_root(root
);
9581 root_dropped
= true;
9583 btrfs_end_transaction_throttle(trans
);
9586 btrfs_free_path(path
);
9589 * So if we need to stop dropping the snapshot for whatever reason we
9590 * need to make sure to add it back to the dead root list so that we
9591 * keep trying to do the work later. This also cleans up roots if we
9592 * don't have it in the radix (like when we recover after a power fail
9593 * or unmount) so we don't leak memory.
9595 if (!for_reloc
&& !root_dropped
)
9596 btrfs_add_dead_root(root
);
9597 if (err
&& err
!= -EAGAIN
)
9598 btrfs_handle_fs_error(fs_info
, err
, NULL
);
9603 * drop subtree rooted at tree block 'node'.
9605 * NOTE: this function will unlock and release tree block 'node'
9606 * only used by relocation code
9608 int btrfs_drop_subtree(struct btrfs_trans_handle
*trans
,
9609 struct btrfs_root
*root
,
9610 struct extent_buffer
*node
,
9611 struct extent_buffer
*parent
)
9613 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
9614 struct btrfs_path
*path
;
9615 struct walk_control
*wc
;
9621 BUG_ON(root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
);
9623 path
= btrfs_alloc_path();
9627 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
9629 btrfs_free_path(path
);
9633 btrfs_assert_tree_locked(parent
);
9634 parent_level
= btrfs_header_level(parent
);
9635 extent_buffer_get(parent
);
9636 path
->nodes
[parent_level
] = parent
;
9637 path
->slots
[parent_level
] = btrfs_header_nritems(parent
);
9639 btrfs_assert_tree_locked(node
);
9640 level
= btrfs_header_level(node
);
9641 path
->nodes
[level
] = node
;
9642 path
->slots
[level
] = 0;
9643 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
9645 wc
->refs
[parent_level
] = 1;
9646 wc
->flags
[parent_level
] = BTRFS_BLOCK_FLAG_FULL_BACKREF
;
9648 wc
->shared_level
= -1;
9649 wc
->stage
= DROP_REFERENCE
;
9652 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(fs_info
);
9655 wret
= walk_down_tree(trans
, root
, path
, wc
);
9661 wret
= walk_up_tree(trans
, root
, path
, wc
, parent_level
);
9669 btrfs_free_path(path
);
9673 static u64
update_block_group_flags(struct btrfs_fs_info
*fs_info
, u64 flags
)
9679 * if restripe for this chunk_type is on pick target profile and
9680 * return, otherwise do the usual balance
9682 stripped
= get_restripe_target(fs_info
, flags
);
9684 return extended_to_chunk(stripped
);
9686 num_devices
= fs_info
->fs_devices
->rw_devices
;
9688 stripped
= BTRFS_BLOCK_GROUP_RAID0
|
9689 BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
|
9690 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID10
;
9692 if (num_devices
== 1) {
9693 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
9694 stripped
= flags
& ~stripped
;
9696 /* turn raid0 into single device chunks */
9697 if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
9700 /* turn mirroring into duplication */
9701 if (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
9702 BTRFS_BLOCK_GROUP_RAID10
))
9703 return stripped
| BTRFS_BLOCK_GROUP_DUP
;
9705 /* they already had raid on here, just return */
9706 if (flags
& stripped
)
9709 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
9710 stripped
= flags
& ~stripped
;
9712 /* switch duplicated blocks with raid1 */
9713 if (flags
& BTRFS_BLOCK_GROUP_DUP
)
9714 return stripped
| BTRFS_BLOCK_GROUP_RAID1
;
9716 /* this is drive concat, leave it alone */
9722 static int inc_block_group_ro(struct btrfs_block_group_cache
*cache
, int force
)
9724 struct btrfs_space_info
*sinfo
= cache
->space_info
;
9727 u64 min_allocable_bytes
;
9731 * We need some metadata space and system metadata space for
9732 * allocating chunks in some corner cases until we force to set
9733 * it to be readonly.
9736 (BTRFS_BLOCK_GROUP_SYSTEM
| BTRFS_BLOCK_GROUP_METADATA
)) &&
9738 min_allocable_bytes
= SZ_1M
;
9740 min_allocable_bytes
= 0;
9742 spin_lock(&sinfo
->lock
);
9743 spin_lock(&cache
->lock
);
9751 num_bytes
= cache
->key
.offset
- cache
->reserved
- cache
->pinned
-
9752 cache
->bytes_super
- btrfs_block_group_used(&cache
->item
);
9753 sinfo_used
= btrfs_space_info_used(sinfo
, true);
9755 if (sinfo_used
+ num_bytes
+ min_allocable_bytes
<=
9756 sinfo
->total_bytes
) {
9757 sinfo
->bytes_readonly
+= num_bytes
;
9759 list_add_tail(&cache
->ro_list
, &sinfo
->ro_bgs
);
9763 spin_unlock(&cache
->lock
);
9764 spin_unlock(&sinfo
->lock
);
9765 if (ret
== -ENOSPC
&& btrfs_test_opt(cache
->fs_info
, ENOSPC_DEBUG
)) {
9766 btrfs_info(cache
->fs_info
,
9767 "unable to make block group %llu ro",
9768 cache
->key
.objectid
);
9769 btrfs_info(cache
->fs_info
,
9770 "sinfo_used=%llu bg_num_bytes=%llu min_allocable=%llu",
9771 sinfo_used
, num_bytes
, min_allocable_bytes
);
9772 dump_space_info(cache
->fs_info
, cache
->space_info
, 0, 0);
9777 int btrfs_inc_block_group_ro(struct btrfs_block_group_cache
*cache
)
9780 struct btrfs_fs_info
*fs_info
= cache
->fs_info
;
9781 struct btrfs_trans_handle
*trans
;
9786 trans
= btrfs_join_transaction(fs_info
->extent_root
);
9788 return PTR_ERR(trans
);
9791 * we're not allowed to set block groups readonly after the dirty
9792 * block groups cache has started writing. If it already started,
9793 * back off and let this transaction commit
9795 mutex_lock(&fs_info
->ro_block_group_mutex
);
9796 if (test_bit(BTRFS_TRANS_DIRTY_BG_RUN
, &trans
->transaction
->flags
)) {
9797 u64 transid
= trans
->transid
;
9799 mutex_unlock(&fs_info
->ro_block_group_mutex
);
9800 btrfs_end_transaction(trans
);
9802 ret
= btrfs_wait_for_commit(fs_info
, transid
);
9809 * if we are changing raid levels, try to allocate a corresponding
9810 * block group with the new raid level.
9812 alloc_flags
= update_block_group_flags(fs_info
, cache
->flags
);
9813 if (alloc_flags
!= cache
->flags
) {
9814 ret
= do_chunk_alloc(trans
, alloc_flags
,
9817 * ENOSPC is allowed here, we may have enough space
9818 * already allocated at the new raid level to
9827 ret
= inc_block_group_ro(cache
, 0);
9830 alloc_flags
= get_alloc_profile(fs_info
, cache
->space_info
->flags
);
9831 ret
= do_chunk_alloc(trans
, alloc_flags
, CHUNK_ALLOC_FORCE
);
9834 ret
= inc_block_group_ro(cache
, 0);
9836 if (cache
->flags
& BTRFS_BLOCK_GROUP_SYSTEM
) {
9837 alloc_flags
= update_block_group_flags(fs_info
, cache
->flags
);
9838 mutex_lock(&fs_info
->chunk_mutex
);
9839 check_system_chunk(trans
, alloc_flags
);
9840 mutex_unlock(&fs_info
->chunk_mutex
);
9842 mutex_unlock(&fs_info
->ro_block_group_mutex
);
9844 btrfs_end_transaction(trans
);
9848 int btrfs_force_chunk_alloc(struct btrfs_trans_handle
*trans
, u64 type
)
9850 u64 alloc_flags
= get_alloc_profile(trans
->fs_info
, type
);
9852 return do_chunk_alloc(trans
, alloc_flags
, CHUNK_ALLOC_FORCE
);
9856 * helper to account the unused space of all the readonly block group in the
9857 * space_info. takes mirrors into account.
9859 u64
btrfs_account_ro_block_groups_free_space(struct btrfs_space_info
*sinfo
)
9861 struct btrfs_block_group_cache
*block_group
;
9865 /* It's df, we don't care if it's racy */
9866 if (list_empty(&sinfo
->ro_bgs
))
9869 spin_lock(&sinfo
->lock
);
9870 list_for_each_entry(block_group
, &sinfo
->ro_bgs
, ro_list
) {
9871 spin_lock(&block_group
->lock
);
9873 if (!block_group
->ro
) {
9874 spin_unlock(&block_group
->lock
);
9878 factor
= btrfs_bg_type_to_factor(block_group
->flags
);
9879 free_bytes
+= (block_group
->key
.offset
-
9880 btrfs_block_group_used(&block_group
->item
)) *
9883 spin_unlock(&block_group
->lock
);
9885 spin_unlock(&sinfo
->lock
);
9890 void btrfs_dec_block_group_ro(struct btrfs_block_group_cache
*cache
)
9892 struct btrfs_space_info
*sinfo
= cache
->space_info
;
9897 spin_lock(&sinfo
->lock
);
9898 spin_lock(&cache
->lock
);
9900 num_bytes
= cache
->key
.offset
- cache
->reserved
-
9901 cache
->pinned
- cache
->bytes_super
-
9902 btrfs_block_group_used(&cache
->item
);
9903 sinfo
->bytes_readonly
-= num_bytes
;
9904 list_del_init(&cache
->ro_list
);
9906 spin_unlock(&cache
->lock
);
9907 spin_unlock(&sinfo
->lock
);
9911 * Checks to see if it's even possible to relocate this block group.
9913 * @return - -1 if it's not a good idea to relocate this block group, 0 if its
9914 * ok to go ahead and try.
9916 int btrfs_can_relocate(struct btrfs_fs_info
*fs_info
, u64 bytenr
)
9918 struct btrfs_root
*root
= fs_info
->extent_root
;
9919 struct btrfs_block_group_cache
*block_group
;
9920 struct btrfs_space_info
*space_info
;
9921 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
9922 struct btrfs_device
*device
;
9923 struct btrfs_trans_handle
*trans
;
9933 debug
= btrfs_test_opt(fs_info
, ENOSPC_DEBUG
);
9935 block_group
= btrfs_lookup_block_group(fs_info
, bytenr
);
9937 /* odd, couldn't find the block group, leave it alone */
9941 "can't find block group for bytenr %llu",
9946 min_free
= btrfs_block_group_used(&block_group
->item
);
9948 /* no bytes used, we're good */
9952 space_info
= block_group
->space_info
;
9953 spin_lock(&space_info
->lock
);
9955 full
= space_info
->full
;
9958 * if this is the last block group we have in this space, we can't
9959 * relocate it unless we're able to allocate a new chunk below.
9961 * Otherwise, we need to make sure we have room in the space to handle
9962 * all of the extents from this block group. If we can, we're good
9964 if ((space_info
->total_bytes
!= block_group
->key
.offset
) &&
9965 (btrfs_space_info_used(space_info
, false) + min_free
<
9966 space_info
->total_bytes
)) {
9967 spin_unlock(&space_info
->lock
);
9970 spin_unlock(&space_info
->lock
);
9973 * ok we don't have enough space, but maybe we have free space on our
9974 * devices to allocate new chunks for relocation, so loop through our
9975 * alloc devices and guess if we have enough space. if this block
9976 * group is going to be restriped, run checks against the target
9977 * profile instead of the current one.
9989 target
= get_restripe_target(fs_info
, block_group
->flags
);
9991 index
= btrfs_bg_flags_to_raid_index(extended_to_chunk(target
));
9994 * this is just a balance, so if we were marked as full
9995 * we know there is no space for a new chunk
10000 "no space to alloc new chunk for block group %llu",
10001 block_group
->key
.objectid
);
10005 index
= btrfs_bg_flags_to_raid_index(block_group
->flags
);
10008 if (index
== BTRFS_RAID_RAID10
) {
10012 } else if (index
== BTRFS_RAID_RAID1
) {
10014 } else if (index
== BTRFS_RAID_DUP
) {
10015 /* Multiply by 2 */
10017 } else if (index
== BTRFS_RAID_RAID0
) {
10018 dev_min
= fs_devices
->rw_devices
;
10019 min_free
= div64_u64(min_free
, dev_min
);
10022 /* We need to do this so that we can look at pending chunks */
10023 trans
= btrfs_join_transaction(root
);
10024 if (IS_ERR(trans
)) {
10025 ret
= PTR_ERR(trans
);
10029 mutex_lock(&fs_info
->chunk_mutex
);
10030 list_for_each_entry(device
, &fs_devices
->alloc_list
, dev_alloc_list
) {
10034 * check to make sure we can actually find a chunk with enough
10035 * space to fit our block group in.
10037 if (device
->total_bytes
> device
->bytes_used
+ min_free
&&
10038 !test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
)) {
10039 ret
= find_free_dev_extent(trans
, device
, min_free
,
10040 &dev_offset
, NULL
);
10044 if (dev_nr
>= dev_min
)
10050 if (debug
&& ret
== -1)
10051 btrfs_warn(fs_info
,
10052 "no space to allocate a new chunk for block group %llu",
10053 block_group
->key
.objectid
);
10054 mutex_unlock(&fs_info
->chunk_mutex
);
10055 btrfs_end_transaction(trans
);
10057 btrfs_put_block_group(block_group
);
10061 static int find_first_block_group(struct btrfs_fs_info
*fs_info
,
10062 struct btrfs_path
*path
,
10063 struct btrfs_key
*key
)
10065 struct btrfs_root
*root
= fs_info
->extent_root
;
10067 struct btrfs_key found_key
;
10068 struct extent_buffer
*leaf
;
10069 struct btrfs_block_group_item bg
;
10073 ret
= btrfs_search_slot(NULL
, root
, key
, path
, 0, 0);
10078 slot
= path
->slots
[0];
10079 leaf
= path
->nodes
[0];
10080 if (slot
>= btrfs_header_nritems(leaf
)) {
10081 ret
= btrfs_next_leaf(root
, path
);
10088 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
10090 if (found_key
.objectid
>= key
->objectid
&&
10091 found_key
.type
== BTRFS_BLOCK_GROUP_ITEM_KEY
) {
10092 struct extent_map_tree
*em_tree
;
10093 struct extent_map
*em
;
10095 em_tree
= &root
->fs_info
->mapping_tree
.map_tree
;
10096 read_lock(&em_tree
->lock
);
10097 em
= lookup_extent_mapping(em_tree
, found_key
.objectid
,
10099 read_unlock(&em_tree
->lock
);
10102 "logical %llu len %llu found bg but no related chunk",
10103 found_key
.objectid
, found_key
.offset
);
10105 } else if (em
->start
!= found_key
.objectid
||
10106 em
->len
!= found_key
.offset
) {
10108 "block group %llu len %llu mismatch with chunk %llu len %llu",
10109 found_key
.objectid
, found_key
.offset
,
10110 em
->start
, em
->len
);
10113 read_extent_buffer(leaf
, &bg
,
10114 btrfs_item_ptr_offset(leaf
, slot
),
10116 flags
= btrfs_block_group_flags(&bg
) &
10117 BTRFS_BLOCK_GROUP_TYPE_MASK
;
10119 if (flags
!= (em
->map_lookup
->type
&
10120 BTRFS_BLOCK_GROUP_TYPE_MASK
)) {
10122 "block group %llu len %llu type flags 0x%llx mismatch with chunk type flags 0x%llx",
10123 found_key
.objectid
,
10124 found_key
.offset
, flags
,
10125 (BTRFS_BLOCK_GROUP_TYPE_MASK
&
10126 em
->map_lookup
->type
));
10132 free_extent_map(em
);
10141 void btrfs_put_block_group_cache(struct btrfs_fs_info
*info
)
10143 struct btrfs_block_group_cache
*block_group
;
10147 struct inode
*inode
;
10149 block_group
= btrfs_lookup_first_block_group(info
, last
);
10150 while (block_group
) {
10151 wait_block_group_cache_done(block_group
);
10152 spin_lock(&block_group
->lock
);
10153 if (block_group
->iref
)
10155 spin_unlock(&block_group
->lock
);
10156 block_group
= next_block_group(info
, block_group
);
10158 if (!block_group
) {
10165 inode
= block_group
->inode
;
10166 block_group
->iref
= 0;
10167 block_group
->inode
= NULL
;
10168 spin_unlock(&block_group
->lock
);
10169 ASSERT(block_group
->io_ctl
.inode
== NULL
);
10171 last
= block_group
->key
.objectid
+ block_group
->key
.offset
;
10172 btrfs_put_block_group(block_group
);
10177 * Must be called only after stopping all workers, since we could have block
10178 * group caching kthreads running, and therefore they could race with us if we
10179 * freed the block groups before stopping them.
10181 int btrfs_free_block_groups(struct btrfs_fs_info
*info
)
10183 struct btrfs_block_group_cache
*block_group
;
10184 struct btrfs_space_info
*space_info
;
10185 struct btrfs_caching_control
*caching_ctl
;
10188 down_write(&info
->commit_root_sem
);
10189 while (!list_empty(&info
->caching_block_groups
)) {
10190 caching_ctl
= list_entry(info
->caching_block_groups
.next
,
10191 struct btrfs_caching_control
, list
);
10192 list_del(&caching_ctl
->list
);
10193 put_caching_control(caching_ctl
);
10195 up_write(&info
->commit_root_sem
);
10197 spin_lock(&info
->unused_bgs_lock
);
10198 while (!list_empty(&info
->unused_bgs
)) {
10199 block_group
= list_first_entry(&info
->unused_bgs
,
10200 struct btrfs_block_group_cache
,
10202 list_del_init(&block_group
->bg_list
);
10203 btrfs_put_block_group(block_group
);
10205 spin_unlock(&info
->unused_bgs_lock
);
10207 spin_lock(&info
->block_group_cache_lock
);
10208 while ((n
= rb_last(&info
->block_group_cache_tree
)) != NULL
) {
10209 block_group
= rb_entry(n
, struct btrfs_block_group_cache
,
10211 rb_erase(&block_group
->cache_node
,
10212 &info
->block_group_cache_tree
);
10213 RB_CLEAR_NODE(&block_group
->cache_node
);
10214 spin_unlock(&info
->block_group_cache_lock
);
10216 down_write(&block_group
->space_info
->groups_sem
);
10217 list_del(&block_group
->list
);
10218 up_write(&block_group
->space_info
->groups_sem
);
10221 * We haven't cached this block group, which means we could
10222 * possibly have excluded extents on this block group.
10224 if (block_group
->cached
== BTRFS_CACHE_NO
||
10225 block_group
->cached
== BTRFS_CACHE_ERROR
)
10226 free_excluded_extents(block_group
);
10228 btrfs_remove_free_space_cache(block_group
);
10229 ASSERT(block_group
->cached
!= BTRFS_CACHE_STARTED
);
10230 ASSERT(list_empty(&block_group
->dirty_list
));
10231 ASSERT(list_empty(&block_group
->io_list
));
10232 ASSERT(list_empty(&block_group
->bg_list
));
10233 ASSERT(atomic_read(&block_group
->count
) == 1);
10234 btrfs_put_block_group(block_group
);
10236 spin_lock(&info
->block_group_cache_lock
);
10238 spin_unlock(&info
->block_group_cache_lock
);
10240 /* now that all the block groups are freed, go through and
10241 * free all the space_info structs. This is only called during
10242 * the final stages of unmount, and so we know nobody is
10243 * using them. We call synchronize_rcu() once before we start,
10244 * just to be on the safe side.
10248 release_global_block_rsv(info
);
10250 while (!list_empty(&info
->space_info
)) {
10253 space_info
= list_entry(info
->space_info
.next
,
10254 struct btrfs_space_info
,
10258 * Do not hide this behind enospc_debug, this is actually
10259 * important and indicates a real bug if this happens.
10261 if (WARN_ON(space_info
->bytes_pinned
> 0 ||
10262 space_info
->bytes_reserved
> 0 ||
10263 space_info
->bytes_may_use
> 0))
10264 dump_space_info(info
, space_info
, 0, 0);
10265 list_del(&space_info
->list
);
10266 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++) {
10267 struct kobject
*kobj
;
10268 kobj
= space_info
->block_group_kobjs
[i
];
10269 space_info
->block_group_kobjs
[i
] = NULL
;
10275 kobject_del(&space_info
->kobj
);
10276 kobject_put(&space_info
->kobj
);
10281 /* link_block_group will queue up kobjects to add when we're reclaim-safe */
10282 void btrfs_add_raid_kobjects(struct btrfs_fs_info
*fs_info
)
10284 struct btrfs_space_info
*space_info
;
10285 struct raid_kobject
*rkobj
;
10290 spin_lock(&fs_info
->pending_raid_kobjs_lock
);
10291 list_splice_init(&fs_info
->pending_raid_kobjs
, &list
);
10292 spin_unlock(&fs_info
->pending_raid_kobjs_lock
);
10294 list_for_each_entry(rkobj
, &list
, list
) {
10295 space_info
= __find_space_info(fs_info
, rkobj
->flags
);
10296 index
= btrfs_bg_flags_to_raid_index(rkobj
->flags
);
10298 ret
= kobject_add(&rkobj
->kobj
, &space_info
->kobj
,
10299 "%s", get_raid_name(index
));
10301 kobject_put(&rkobj
->kobj
);
10306 btrfs_warn(fs_info
,
10307 "failed to add kobject for block cache, ignoring");
10310 static void link_block_group(struct btrfs_block_group_cache
*cache
)
10312 struct btrfs_space_info
*space_info
= cache
->space_info
;
10313 struct btrfs_fs_info
*fs_info
= cache
->fs_info
;
10314 int index
= btrfs_bg_flags_to_raid_index(cache
->flags
);
10315 bool first
= false;
10317 down_write(&space_info
->groups_sem
);
10318 if (list_empty(&space_info
->block_groups
[index
]))
10320 list_add_tail(&cache
->list
, &space_info
->block_groups
[index
]);
10321 up_write(&space_info
->groups_sem
);
10324 struct raid_kobject
*rkobj
= kzalloc(sizeof(*rkobj
), GFP_NOFS
);
10326 btrfs_warn(cache
->fs_info
,
10327 "couldn't alloc memory for raid level kobject");
10330 rkobj
->flags
= cache
->flags
;
10331 kobject_init(&rkobj
->kobj
, &btrfs_raid_ktype
);
10333 spin_lock(&fs_info
->pending_raid_kobjs_lock
);
10334 list_add_tail(&rkobj
->list
, &fs_info
->pending_raid_kobjs
);
10335 spin_unlock(&fs_info
->pending_raid_kobjs_lock
);
10336 space_info
->block_group_kobjs
[index
] = &rkobj
->kobj
;
10340 static struct btrfs_block_group_cache
*
10341 btrfs_create_block_group_cache(struct btrfs_fs_info
*fs_info
,
10342 u64 start
, u64 size
)
10344 struct btrfs_block_group_cache
*cache
;
10346 cache
= kzalloc(sizeof(*cache
), GFP_NOFS
);
10350 cache
->free_space_ctl
= kzalloc(sizeof(*cache
->free_space_ctl
),
10352 if (!cache
->free_space_ctl
) {
10357 cache
->key
.objectid
= start
;
10358 cache
->key
.offset
= size
;
10359 cache
->key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
10361 cache
->fs_info
= fs_info
;
10362 cache
->full_stripe_len
= btrfs_full_stripe_len(fs_info
, start
);
10363 set_free_space_tree_thresholds(cache
);
10365 atomic_set(&cache
->count
, 1);
10366 spin_lock_init(&cache
->lock
);
10367 init_rwsem(&cache
->data_rwsem
);
10368 INIT_LIST_HEAD(&cache
->list
);
10369 INIT_LIST_HEAD(&cache
->cluster_list
);
10370 INIT_LIST_HEAD(&cache
->bg_list
);
10371 INIT_LIST_HEAD(&cache
->ro_list
);
10372 INIT_LIST_HEAD(&cache
->dirty_list
);
10373 INIT_LIST_HEAD(&cache
->io_list
);
10374 btrfs_init_free_space_ctl(cache
);
10375 atomic_set(&cache
->trimming
, 0);
10376 mutex_init(&cache
->free_space_lock
);
10377 btrfs_init_full_stripe_locks_tree(&cache
->full_stripe_locks_root
);
10384 * Iterate all chunks and verify that each of them has the corresponding block
10387 static int check_chunk_block_group_mappings(struct btrfs_fs_info
*fs_info
)
10389 struct btrfs_mapping_tree
*map_tree
= &fs_info
->mapping_tree
;
10390 struct extent_map
*em
;
10391 struct btrfs_block_group_cache
*bg
;
10396 read_lock(&map_tree
->map_tree
.lock
);
10398 * lookup_extent_mapping will return the first extent map
10399 * intersecting the range, so setting @len to 1 is enough to
10400 * get the first chunk.
10402 em
= lookup_extent_mapping(&map_tree
->map_tree
, start
, 1);
10403 read_unlock(&map_tree
->map_tree
.lock
);
10407 bg
= btrfs_lookup_block_group(fs_info
, em
->start
);
10410 "chunk start=%llu len=%llu doesn't have corresponding block group",
10411 em
->start
, em
->len
);
10413 free_extent_map(em
);
10416 if (bg
->key
.objectid
!= em
->start
||
10417 bg
->key
.offset
!= em
->len
||
10418 (bg
->flags
& BTRFS_BLOCK_GROUP_TYPE_MASK
) !=
10419 (em
->map_lookup
->type
& BTRFS_BLOCK_GROUP_TYPE_MASK
)) {
10421 "chunk start=%llu len=%llu flags=0x%llx doesn't match block group start=%llu len=%llu flags=0x%llx",
10422 em
->start
, em
->len
,
10423 em
->map_lookup
->type
& BTRFS_BLOCK_GROUP_TYPE_MASK
,
10424 bg
->key
.objectid
, bg
->key
.offset
,
10425 bg
->flags
& BTRFS_BLOCK_GROUP_TYPE_MASK
);
10427 free_extent_map(em
);
10428 btrfs_put_block_group(bg
);
10431 start
= em
->start
+ em
->len
;
10432 free_extent_map(em
);
10433 btrfs_put_block_group(bg
);
10438 int btrfs_read_block_groups(struct btrfs_fs_info
*info
)
10440 struct btrfs_path
*path
;
10442 struct btrfs_block_group_cache
*cache
;
10443 struct btrfs_space_info
*space_info
;
10444 struct btrfs_key key
;
10445 struct btrfs_key found_key
;
10446 struct extent_buffer
*leaf
;
10447 int need_clear
= 0;
10452 feature
= btrfs_super_incompat_flags(info
->super_copy
);
10453 mixed
= !!(feature
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
);
10457 key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
10458 path
= btrfs_alloc_path();
10461 path
->reada
= READA_FORWARD
;
10463 cache_gen
= btrfs_super_cache_generation(info
->super_copy
);
10464 if (btrfs_test_opt(info
, SPACE_CACHE
) &&
10465 btrfs_super_generation(info
->super_copy
) != cache_gen
)
10467 if (btrfs_test_opt(info
, CLEAR_CACHE
))
10471 ret
= find_first_block_group(info
, path
, &key
);
10477 leaf
= path
->nodes
[0];
10478 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
10480 cache
= btrfs_create_block_group_cache(info
, found_key
.objectid
,
10489 * When we mount with old space cache, we need to
10490 * set BTRFS_DC_CLEAR and set dirty flag.
10492 * a) Setting 'BTRFS_DC_CLEAR' makes sure that we
10493 * truncate the old free space cache inode and
10495 * b) Setting 'dirty flag' makes sure that we flush
10496 * the new space cache info onto disk.
10498 if (btrfs_test_opt(info
, SPACE_CACHE
))
10499 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
10502 read_extent_buffer(leaf
, &cache
->item
,
10503 btrfs_item_ptr_offset(leaf
, path
->slots
[0]),
10504 sizeof(cache
->item
));
10505 cache
->flags
= btrfs_block_group_flags(&cache
->item
);
10507 ((cache
->flags
& BTRFS_BLOCK_GROUP_METADATA
) &&
10508 (cache
->flags
& BTRFS_BLOCK_GROUP_DATA
))) {
10510 "bg %llu is a mixed block group but filesystem hasn't enabled mixed block groups",
10511 cache
->key
.objectid
);
10516 key
.objectid
= found_key
.objectid
+ found_key
.offset
;
10517 btrfs_release_path(path
);
10520 * We need to exclude the super stripes now so that the space
10521 * info has super bytes accounted for, otherwise we'll think
10522 * we have more space than we actually do.
10524 ret
= exclude_super_stripes(cache
);
10527 * We may have excluded something, so call this just in
10530 free_excluded_extents(cache
);
10531 btrfs_put_block_group(cache
);
10536 * check for two cases, either we are full, and therefore
10537 * don't need to bother with the caching work since we won't
10538 * find any space, or we are empty, and we can just add all
10539 * the space in and be done with it. This saves us _a_lot_ of
10540 * time, particularly in the full case.
10542 if (found_key
.offset
== btrfs_block_group_used(&cache
->item
)) {
10543 cache
->last_byte_to_unpin
= (u64
)-1;
10544 cache
->cached
= BTRFS_CACHE_FINISHED
;
10545 free_excluded_extents(cache
);
10546 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
10547 cache
->last_byte_to_unpin
= (u64
)-1;
10548 cache
->cached
= BTRFS_CACHE_FINISHED
;
10549 add_new_free_space(cache
, found_key
.objectid
,
10550 found_key
.objectid
+
10552 free_excluded_extents(cache
);
10555 ret
= btrfs_add_block_group_cache(info
, cache
);
10557 btrfs_remove_free_space_cache(cache
);
10558 btrfs_put_block_group(cache
);
10562 trace_btrfs_add_block_group(info
, cache
, 0);
10563 update_space_info(info
, cache
->flags
, found_key
.offset
,
10564 btrfs_block_group_used(&cache
->item
),
10565 cache
->bytes_super
, &space_info
);
10567 cache
->space_info
= space_info
;
10569 link_block_group(cache
);
10571 set_avail_alloc_bits(info
, cache
->flags
);
10572 if (btrfs_chunk_readonly(info
, cache
->key
.objectid
)) {
10573 inc_block_group_ro(cache
, 1);
10574 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
10575 ASSERT(list_empty(&cache
->bg_list
));
10576 btrfs_mark_bg_unused(cache
);
10580 list_for_each_entry_rcu(space_info
, &info
->space_info
, list
) {
10581 if (!(get_alloc_profile(info
, space_info
->flags
) &
10582 (BTRFS_BLOCK_GROUP_RAID10
|
10583 BTRFS_BLOCK_GROUP_RAID1
|
10584 BTRFS_BLOCK_GROUP_RAID5
|
10585 BTRFS_BLOCK_GROUP_RAID6
|
10586 BTRFS_BLOCK_GROUP_DUP
)))
10589 * avoid allocating from un-mirrored block group if there are
10590 * mirrored block groups.
10592 list_for_each_entry(cache
,
10593 &space_info
->block_groups
[BTRFS_RAID_RAID0
],
10595 inc_block_group_ro(cache
, 1);
10596 list_for_each_entry(cache
,
10597 &space_info
->block_groups
[BTRFS_RAID_SINGLE
],
10599 inc_block_group_ro(cache
, 1);
10602 btrfs_add_raid_kobjects(info
);
10603 init_global_block_rsv(info
);
10604 ret
= check_chunk_block_group_mappings(info
);
10606 btrfs_free_path(path
);
10610 void btrfs_create_pending_block_groups(struct btrfs_trans_handle
*trans
)
10612 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
10613 struct btrfs_block_group_cache
*block_group
;
10614 struct btrfs_root
*extent_root
= fs_info
->extent_root
;
10615 struct btrfs_block_group_item item
;
10616 struct btrfs_key key
;
10619 if (!trans
->can_flush_pending_bgs
)
10622 while (!list_empty(&trans
->new_bgs
)) {
10623 block_group
= list_first_entry(&trans
->new_bgs
,
10624 struct btrfs_block_group_cache
,
10629 spin_lock(&block_group
->lock
);
10630 memcpy(&item
, &block_group
->item
, sizeof(item
));
10631 memcpy(&key
, &block_group
->key
, sizeof(key
));
10632 spin_unlock(&block_group
->lock
);
10634 ret
= btrfs_insert_item(trans
, extent_root
, &key
, &item
,
10637 btrfs_abort_transaction(trans
, ret
);
10638 ret
= btrfs_finish_chunk_alloc(trans
, key
.objectid
, key
.offset
);
10640 btrfs_abort_transaction(trans
, ret
);
10641 add_block_group_free_space(trans
, block_group
);
10642 /* already aborted the transaction if it failed. */
10644 btrfs_delayed_refs_rsv_release(fs_info
, 1);
10645 list_del_init(&block_group
->bg_list
);
10647 btrfs_trans_release_chunk_metadata(trans
);
10650 int btrfs_make_block_group(struct btrfs_trans_handle
*trans
, u64 bytes_used
,
10651 u64 type
, u64 chunk_offset
, u64 size
)
10653 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
10654 struct btrfs_block_group_cache
*cache
;
10657 btrfs_set_log_full_commit(fs_info
, trans
);
10659 cache
= btrfs_create_block_group_cache(fs_info
, chunk_offset
, size
);
10663 btrfs_set_block_group_used(&cache
->item
, bytes_used
);
10664 btrfs_set_block_group_chunk_objectid(&cache
->item
,
10665 BTRFS_FIRST_CHUNK_TREE_OBJECTID
);
10666 btrfs_set_block_group_flags(&cache
->item
, type
);
10668 cache
->flags
= type
;
10669 cache
->last_byte_to_unpin
= (u64
)-1;
10670 cache
->cached
= BTRFS_CACHE_FINISHED
;
10671 cache
->needs_free_space
= 1;
10672 ret
= exclude_super_stripes(cache
);
10675 * We may have excluded something, so call this just in
10678 free_excluded_extents(cache
);
10679 btrfs_put_block_group(cache
);
10683 add_new_free_space(cache
, chunk_offset
, chunk_offset
+ size
);
10685 free_excluded_extents(cache
);
10687 #ifdef CONFIG_BTRFS_DEBUG
10688 if (btrfs_should_fragment_free_space(cache
)) {
10689 u64 new_bytes_used
= size
- bytes_used
;
10691 bytes_used
+= new_bytes_used
>> 1;
10692 fragment_free_space(cache
);
10696 * Ensure the corresponding space_info object is created and
10697 * assigned to our block group. We want our bg to be added to the rbtree
10698 * with its ->space_info set.
10700 cache
->space_info
= __find_space_info(fs_info
, cache
->flags
);
10701 ASSERT(cache
->space_info
);
10703 ret
= btrfs_add_block_group_cache(fs_info
, cache
);
10705 btrfs_remove_free_space_cache(cache
);
10706 btrfs_put_block_group(cache
);
10711 * Now that our block group has its ->space_info set and is inserted in
10712 * the rbtree, update the space info's counters.
10714 trace_btrfs_add_block_group(fs_info
, cache
, 1);
10715 update_space_info(fs_info
, cache
->flags
, size
, bytes_used
,
10716 cache
->bytes_super
, &cache
->space_info
);
10717 update_global_block_rsv(fs_info
);
10719 link_block_group(cache
);
10721 list_add_tail(&cache
->bg_list
, &trans
->new_bgs
);
10722 trans
->delayed_ref_updates
++;
10723 btrfs_update_delayed_refs_rsv(trans
);
10725 set_avail_alloc_bits(fs_info
, type
);
10729 static void clear_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
10731 u64 extra_flags
= chunk_to_extended(flags
) &
10732 BTRFS_EXTENDED_PROFILE_MASK
;
10734 write_seqlock(&fs_info
->profiles_lock
);
10735 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
10736 fs_info
->avail_data_alloc_bits
&= ~extra_flags
;
10737 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
10738 fs_info
->avail_metadata_alloc_bits
&= ~extra_flags
;
10739 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
10740 fs_info
->avail_system_alloc_bits
&= ~extra_flags
;
10741 write_sequnlock(&fs_info
->profiles_lock
);
10744 int btrfs_remove_block_group(struct btrfs_trans_handle
*trans
,
10745 u64 group_start
, struct extent_map
*em
)
10747 struct btrfs_fs_info
*fs_info
= trans
->fs_info
;
10748 struct btrfs_root
*root
= fs_info
->extent_root
;
10749 struct btrfs_path
*path
;
10750 struct btrfs_block_group_cache
*block_group
;
10751 struct btrfs_free_cluster
*cluster
;
10752 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
10753 struct btrfs_key key
;
10754 struct inode
*inode
;
10755 struct kobject
*kobj
= NULL
;
10759 struct btrfs_caching_control
*caching_ctl
= NULL
;
10761 bool remove_rsv
= false;
10763 block_group
= btrfs_lookup_block_group(fs_info
, group_start
);
10764 BUG_ON(!block_group
);
10765 BUG_ON(!block_group
->ro
);
10767 trace_btrfs_remove_block_group(block_group
);
10769 * Free the reserved super bytes from this block group before
10772 free_excluded_extents(block_group
);
10773 btrfs_free_ref_tree_range(fs_info
, block_group
->key
.objectid
,
10774 block_group
->key
.offset
);
10776 memcpy(&key
, &block_group
->key
, sizeof(key
));
10777 index
= btrfs_bg_flags_to_raid_index(block_group
->flags
);
10778 factor
= btrfs_bg_type_to_factor(block_group
->flags
);
10780 /* make sure this block group isn't part of an allocation cluster */
10781 cluster
= &fs_info
->data_alloc_cluster
;
10782 spin_lock(&cluster
->refill_lock
);
10783 btrfs_return_cluster_to_free_space(block_group
, cluster
);
10784 spin_unlock(&cluster
->refill_lock
);
10787 * make sure this block group isn't part of a metadata
10788 * allocation cluster
10790 cluster
= &fs_info
->meta_alloc_cluster
;
10791 spin_lock(&cluster
->refill_lock
);
10792 btrfs_return_cluster_to_free_space(block_group
, cluster
);
10793 spin_unlock(&cluster
->refill_lock
);
10795 path
= btrfs_alloc_path();
10802 * get the inode first so any iput calls done for the io_list
10803 * aren't the final iput (no unlinks allowed now)
10805 inode
= lookup_free_space_inode(fs_info
, block_group
, path
);
10807 mutex_lock(&trans
->transaction
->cache_write_mutex
);
10809 * Make sure our free space cache IO is done before removing the
10812 spin_lock(&trans
->transaction
->dirty_bgs_lock
);
10813 if (!list_empty(&block_group
->io_list
)) {
10814 list_del_init(&block_group
->io_list
);
10816 WARN_ON(!IS_ERR(inode
) && inode
!= block_group
->io_ctl
.inode
);
10818 spin_unlock(&trans
->transaction
->dirty_bgs_lock
);
10819 btrfs_wait_cache_io(trans
, block_group
, path
);
10820 btrfs_put_block_group(block_group
);
10821 spin_lock(&trans
->transaction
->dirty_bgs_lock
);
10824 if (!list_empty(&block_group
->dirty_list
)) {
10825 list_del_init(&block_group
->dirty_list
);
10827 btrfs_put_block_group(block_group
);
10829 spin_unlock(&trans
->transaction
->dirty_bgs_lock
);
10830 mutex_unlock(&trans
->transaction
->cache_write_mutex
);
10832 if (!IS_ERR(inode
)) {
10833 ret
= btrfs_orphan_add(trans
, BTRFS_I(inode
));
10835 btrfs_add_delayed_iput(inode
);
10838 clear_nlink(inode
);
10839 /* One for the block groups ref */
10840 spin_lock(&block_group
->lock
);
10841 if (block_group
->iref
) {
10842 block_group
->iref
= 0;
10843 block_group
->inode
= NULL
;
10844 spin_unlock(&block_group
->lock
);
10847 spin_unlock(&block_group
->lock
);
10849 /* One for our lookup ref */
10850 btrfs_add_delayed_iput(inode
);
10853 key
.objectid
= BTRFS_FREE_SPACE_OBJECTID
;
10854 key
.offset
= block_group
->key
.objectid
;
10857 ret
= btrfs_search_slot(trans
, tree_root
, &key
, path
, -1, 1);
10861 btrfs_release_path(path
);
10863 ret
= btrfs_del_item(trans
, tree_root
, path
);
10866 btrfs_release_path(path
);
10869 spin_lock(&fs_info
->block_group_cache_lock
);
10870 rb_erase(&block_group
->cache_node
,
10871 &fs_info
->block_group_cache_tree
);
10872 RB_CLEAR_NODE(&block_group
->cache_node
);
10874 if (fs_info
->first_logical_byte
== block_group
->key
.objectid
)
10875 fs_info
->first_logical_byte
= (u64
)-1;
10876 spin_unlock(&fs_info
->block_group_cache_lock
);
10878 down_write(&block_group
->space_info
->groups_sem
);
10880 * we must use list_del_init so people can check to see if they
10881 * are still on the list after taking the semaphore
10883 list_del_init(&block_group
->list
);
10884 if (list_empty(&block_group
->space_info
->block_groups
[index
])) {
10885 kobj
= block_group
->space_info
->block_group_kobjs
[index
];
10886 block_group
->space_info
->block_group_kobjs
[index
] = NULL
;
10887 clear_avail_alloc_bits(fs_info
, block_group
->flags
);
10889 up_write(&block_group
->space_info
->groups_sem
);
10895 if (block_group
->has_caching_ctl
)
10896 caching_ctl
= get_caching_control(block_group
);
10897 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
10898 wait_block_group_cache_done(block_group
);
10899 if (block_group
->has_caching_ctl
) {
10900 down_write(&fs_info
->commit_root_sem
);
10901 if (!caching_ctl
) {
10902 struct btrfs_caching_control
*ctl
;
10904 list_for_each_entry(ctl
,
10905 &fs_info
->caching_block_groups
, list
)
10906 if (ctl
->block_group
== block_group
) {
10908 refcount_inc(&caching_ctl
->count
);
10913 list_del_init(&caching_ctl
->list
);
10914 up_write(&fs_info
->commit_root_sem
);
10916 /* Once for the caching bgs list and once for us. */
10917 put_caching_control(caching_ctl
);
10918 put_caching_control(caching_ctl
);
10922 spin_lock(&trans
->transaction
->dirty_bgs_lock
);
10923 WARN_ON(!list_empty(&block_group
->dirty_list
));
10924 WARN_ON(!list_empty(&block_group
->io_list
));
10925 spin_unlock(&trans
->transaction
->dirty_bgs_lock
);
10927 btrfs_remove_free_space_cache(block_group
);
10929 spin_lock(&block_group
->space_info
->lock
);
10930 list_del_init(&block_group
->ro_list
);
10932 if (btrfs_test_opt(fs_info
, ENOSPC_DEBUG
)) {
10933 WARN_ON(block_group
->space_info
->total_bytes
10934 < block_group
->key
.offset
);
10935 WARN_ON(block_group
->space_info
->bytes_readonly
10936 < block_group
->key
.offset
);
10937 WARN_ON(block_group
->space_info
->disk_total
10938 < block_group
->key
.offset
* factor
);
10940 block_group
->space_info
->total_bytes
-= block_group
->key
.offset
;
10941 block_group
->space_info
->bytes_readonly
-= block_group
->key
.offset
;
10942 block_group
->space_info
->disk_total
-= block_group
->key
.offset
* factor
;
10944 spin_unlock(&block_group
->space_info
->lock
);
10946 memcpy(&key
, &block_group
->key
, sizeof(key
));
10948 mutex_lock(&fs_info
->chunk_mutex
);
10949 if (!list_empty(&em
->list
)) {
10950 /* We're in the transaction->pending_chunks list. */
10951 free_extent_map(em
);
10953 spin_lock(&block_group
->lock
);
10954 block_group
->removed
= 1;
10956 * At this point trimming can't start on this block group, because we
10957 * removed the block group from the tree fs_info->block_group_cache_tree
10958 * so no one can't find it anymore and even if someone already got this
10959 * block group before we removed it from the rbtree, they have already
10960 * incremented block_group->trimming - if they didn't, they won't find
10961 * any free space entries because we already removed them all when we
10962 * called btrfs_remove_free_space_cache().
10964 * And we must not remove the extent map from the fs_info->mapping_tree
10965 * to prevent the same logical address range and physical device space
10966 * ranges from being reused for a new block group. This is because our
10967 * fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is
10968 * completely transactionless, so while it is trimming a range the
10969 * currently running transaction might finish and a new one start,
10970 * allowing for new block groups to be created that can reuse the same
10971 * physical device locations unless we take this special care.
10973 * There may also be an implicit trim operation if the file system
10974 * is mounted with -odiscard. The same protections must remain
10975 * in place until the extents have been discarded completely when
10976 * the transaction commit has completed.
10978 remove_em
= (atomic_read(&block_group
->trimming
) == 0);
10980 * Make sure a trimmer task always sees the em in the pinned_chunks list
10981 * if it sees block_group->removed == 1 (needs to lock block_group->lock
10982 * before checking block_group->removed).
10986 * Our em might be in trans->transaction->pending_chunks which
10987 * is protected by fs_info->chunk_mutex ([lock|unlock]_chunks),
10988 * and so is the fs_info->pinned_chunks list.
10990 * So at this point we must be holding the chunk_mutex to avoid
10991 * any races with chunk allocation (more specifically at
10992 * volumes.c:contains_pending_extent()), to ensure it always
10993 * sees the em, either in the pending_chunks list or in the
10994 * pinned_chunks list.
10996 list_move_tail(&em
->list
, &fs_info
->pinned_chunks
);
10998 spin_unlock(&block_group
->lock
);
11001 struct extent_map_tree
*em_tree
;
11003 em_tree
= &fs_info
->mapping_tree
.map_tree
;
11004 write_lock(&em_tree
->lock
);
11006 * The em might be in the pending_chunks list, so make sure the
11007 * chunk mutex is locked, since remove_extent_mapping() will
11008 * delete us from that list.
11010 remove_extent_mapping(em_tree
, em
);
11011 write_unlock(&em_tree
->lock
);
11012 /* once for the tree */
11013 free_extent_map(em
);
11016 mutex_unlock(&fs_info
->chunk_mutex
);
11018 ret
= remove_block_group_free_space(trans
, block_group
);
11022 btrfs_put_block_group(block_group
);
11023 btrfs_put_block_group(block_group
);
11025 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
11031 ret
= btrfs_del_item(trans
, root
, path
);
11034 btrfs_delayed_refs_rsv_release(fs_info
, 1);
11035 btrfs_free_path(path
);
11039 struct btrfs_trans_handle
*
11040 btrfs_start_trans_remove_block_group(struct btrfs_fs_info
*fs_info
,
11041 const u64 chunk_offset
)
11043 struct extent_map_tree
*em_tree
= &fs_info
->mapping_tree
.map_tree
;
11044 struct extent_map
*em
;
11045 struct map_lookup
*map
;
11046 unsigned int num_items
;
11048 read_lock(&em_tree
->lock
);
11049 em
= lookup_extent_mapping(em_tree
, chunk_offset
, 1);
11050 read_unlock(&em_tree
->lock
);
11051 ASSERT(em
&& em
->start
== chunk_offset
);
11054 * We need to reserve 3 + N units from the metadata space info in order
11055 * to remove a block group (done at btrfs_remove_chunk() and at
11056 * btrfs_remove_block_group()), which are used for:
11058 * 1 unit for adding the free space inode's orphan (located in the tree
11060 * 1 unit for deleting the block group item (located in the extent
11062 * 1 unit for deleting the free space item (located in tree of tree
11064 * N units for deleting N device extent items corresponding to each
11065 * stripe (located in the device tree).
11067 * In order to remove a block group we also need to reserve units in the
11068 * system space info in order to update the chunk tree (update one or
11069 * more device items and remove one chunk item), but this is done at
11070 * btrfs_remove_chunk() through a call to check_system_chunk().
11072 map
= em
->map_lookup
;
11073 num_items
= 3 + map
->num_stripes
;
11074 free_extent_map(em
);
11076 return btrfs_start_transaction_fallback_global_rsv(fs_info
->extent_root
,
11081 * Process the unused_bgs list and remove any that don't have any allocated
11082 * space inside of them.
11084 void btrfs_delete_unused_bgs(struct btrfs_fs_info
*fs_info
)
11086 struct btrfs_block_group_cache
*block_group
;
11087 struct btrfs_space_info
*space_info
;
11088 struct btrfs_trans_handle
*trans
;
11091 if (!test_bit(BTRFS_FS_OPEN
, &fs_info
->flags
))
11094 spin_lock(&fs_info
->unused_bgs_lock
);
11095 while (!list_empty(&fs_info
->unused_bgs
)) {
11099 block_group
= list_first_entry(&fs_info
->unused_bgs
,
11100 struct btrfs_block_group_cache
,
11102 list_del_init(&block_group
->bg_list
);
11104 space_info
= block_group
->space_info
;
11106 if (ret
|| btrfs_mixed_space_info(space_info
)) {
11107 btrfs_put_block_group(block_group
);
11110 spin_unlock(&fs_info
->unused_bgs_lock
);
11112 mutex_lock(&fs_info
->delete_unused_bgs_mutex
);
11114 /* Don't want to race with allocators so take the groups_sem */
11115 down_write(&space_info
->groups_sem
);
11116 spin_lock(&block_group
->lock
);
11117 if (block_group
->reserved
|| block_group
->pinned
||
11118 btrfs_block_group_used(&block_group
->item
) ||
11120 list_is_singular(&block_group
->list
)) {
11122 * We want to bail if we made new allocations or have
11123 * outstanding allocations in this block group. We do
11124 * the ro check in case balance is currently acting on
11125 * this block group.
11127 trace_btrfs_skip_unused_block_group(block_group
);
11128 spin_unlock(&block_group
->lock
);
11129 up_write(&space_info
->groups_sem
);
11132 spin_unlock(&block_group
->lock
);
11134 /* We don't want to force the issue, only flip if it's ok. */
11135 ret
= inc_block_group_ro(block_group
, 0);
11136 up_write(&space_info
->groups_sem
);
11143 * Want to do this before we do anything else so we can recover
11144 * properly if we fail to join the transaction.
11146 trans
= btrfs_start_trans_remove_block_group(fs_info
,
11147 block_group
->key
.objectid
);
11148 if (IS_ERR(trans
)) {
11149 btrfs_dec_block_group_ro(block_group
);
11150 ret
= PTR_ERR(trans
);
11155 * We could have pending pinned extents for this block group,
11156 * just delete them, we don't care about them anymore.
11158 start
= block_group
->key
.objectid
;
11159 end
= start
+ block_group
->key
.offset
- 1;
11161 * Hold the unused_bg_unpin_mutex lock to avoid racing with
11162 * btrfs_finish_extent_commit(). If we are at transaction N,
11163 * another task might be running finish_extent_commit() for the
11164 * previous transaction N - 1, and have seen a range belonging
11165 * to the block group in freed_extents[] before we were able to
11166 * clear the whole block group range from freed_extents[]. This
11167 * means that task can lookup for the block group after we
11168 * unpinned it from freed_extents[] and removed it, leading to
11169 * a BUG_ON() at btrfs_unpin_extent_range().
11171 mutex_lock(&fs_info
->unused_bg_unpin_mutex
);
11172 ret
= clear_extent_bits(&fs_info
->freed_extents
[0], start
, end
,
11175 mutex_unlock(&fs_info
->unused_bg_unpin_mutex
);
11176 btrfs_dec_block_group_ro(block_group
);
11179 ret
= clear_extent_bits(&fs_info
->freed_extents
[1], start
, end
,
11182 mutex_unlock(&fs_info
->unused_bg_unpin_mutex
);
11183 btrfs_dec_block_group_ro(block_group
);
11186 mutex_unlock(&fs_info
->unused_bg_unpin_mutex
);
11188 /* Reset pinned so btrfs_put_block_group doesn't complain */
11189 spin_lock(&space_info
->lock
);
11190 spin_lock(&block_group
->lock
);
11192 update_bytes_pinned(space_info
, -block_group
->pinned
);
11193 space_info
->bytes_readonly
+= block_group
->pinned
;
11194 percpu_counter_add_batch(&space_info
->total_bytes_pinned
,
11195 -block_group
->pinned
,
11196 BTRFS_TOTAL_BYTES_PINNED_BATCH
);
11197 block_group
->pinned
= 0;
11199 spin_unlock(&block_group
->lock
);
11200 spin_unlock(&space_info
->lock
);
11202 /* DISCARD can flip during remount */
11203 trimming
= btrfs_test_opt(fs_info
, DISCARD
);
11205 /* Implicit trim during transaction commit. */
11207 btrfs_get_block_group_trimming(block_group
);
11210 * Btrfs_remove_chunk will abort the transaction if things go
11213 ret
= btrfs_remove_chunk(trans
, block_group
->key
.objectid
);
11217 btrfs_put_block_group_trimming(block_group
);
11222 * If we're not mounted with -odiscard, we can just forget
11223 * about this block group. Otherwise we'll need to wait
11224 * until transaction commit to do the actual discard.
11227 spin_lock(&fs_info
->unused_bgs_lock
);
11229 * A concurrent scrub might have added us to the list
11230 * fs_info->unused_bgs, so use a list_move operation
11231 * to add the block group to the deleted_bgs list.
11233 list_move(&block_group
->bg_list
,
11234 &trans
->transaction
->deleted_bgs
);
11235 spin_unlock(&fs_info
->unused_bgs_lock
);
11236 btrfs_get_block_group(block_group
);
11239 btrfs_end_transaction(trans
);
11241 mutex_unlock(&fs_info
->delete_unused_bgs_mutex
);
11242 btrfs_put_block_group(block_group
);
11243 spin_lock(&fs_info
->unused_bgs_lock
);
11245 spin_unlock(&fs_info
->unused_bgs_lock
);
11248 int btrfs_init_space_info(struct btrfs_fs_info
*fs_info
)
11250 struct btrfs_super_block
*disk_super
;
11256 disk_super
= fs_info
->super_copy
;
11257 if (!btrfs_super_root(disk_super
))
11260 features
= btrfs_super_incompat_flags(disk_super
);
11261 if (features
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
)
11264 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
11265 ret
= create_space_info(fs_info
, flags
);
11270 flags
= BTRFS_BLOCK_GROUP_METADATA
| BTRFS_BLOCK_GROUP_DATA
;
11271 ret
= create_space_info(fs_info
, flags
);
11273 flags
= BTRFS_BLOCK_GROUP_METADATA
;
11274 ret
= create_space_info(fs_info
, flags
);
11278 flags
= BTRFS_BLOCK_GROUP_DATA
;
11279 ret
= create_space_info(fs_info
, flags
);
11285 int btrfs_error_unpin_extent_range(struct btrfs_fs_info
*fs_info
,
11286 u64 start
, u64 end
)
11288 return unpin_extent_range(fs_info
, start
, end
, false);
11292 * It used to be that old block groups would be left around forever.
11293 * Iterating over them would be enough to trim unused space. Since we
11294 * now automatically remove them, we also need to iterate over unallocated
11297 * We don't want a transaction for this since the discard may take a
11298 * substantial amount of time. We don't require that a transaction be
11299 * running, but we do need to take a running transaction into account
11300 * to ensure that we're not discarding chunks that were released or
11301 * allocated in the current transaction.
11303 * Holding the chunks lock will prevent other threads from allocating
11304 * or releasing chunks, but it won't prevent a running transaction
11305 * from committing and releasing the memory that the pending chunks
11306 * list head uses. For that, we need to take a reference to the
11307 * transaction and hold the commit root sem. We only need to hold
11308 * it while performing the free space search since we have already
11309 * held back allocations.
11311 static int btrfs_trim_free_extents(struct btrfs_device
*device
,
11312 u64 minlen
, u64
*trimmed
)
11314 u64 start
= 0, len
= 0;
11319 /* Discard not supported = nothing to do. */
11320 if (!blk_queue_discard(bdev_get_queue(device
->bdev
)))
11323 /* Not writable = nothing to do. */
11324 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
))
11327 /* No free space = nothing to do. */
11328 if (device
->total_bytes
<= device
->bytes_used
)
11334 struct btrfs_fs_info
*fs_info
= device
->fs_info
;
11335 struct btrfs_transaction
*trans
;
11338 ret
= mutex_lock_interruptible(&fs_info
->chunk_mutex
);
11342 ret
= down_read_killable(&fs_info
->commit_root_sem
);
11344 mutex_unlock(&fs_info
->chunk_mutex
);
11348 spin_lock(&fs_info
->trans_lock
);
11349 trans
= fs_info
->running_transaction
;
11351 refcount_inc(&trans
->use_count
);
11352 spin_unlock(&fs_info
->trans_lock
);
11355 up_read(&fs_info
->commit_root_sem
);
11357 ret
= find_free_dev_extent_start(trans
, device
, minlen
, start
,
11360 up_read(&fs_info
->commit_root_sem
);
11361 btrfs_put_transaction(trans
);
11365 mutex_unlock(&fs_info
->chunk_mutex
);
11366 if (ret
== -ENOSPC
)
11371 ret
= btrfs_issue_discard(device
->bdev
, start
, len
, &bytes
);
11372 mutex_unlock(&fs_info
->chunk_mutex
);
11380 if (fatal_signal_pending(current
)) {
11381 ret
= -ERESTARTSYS
;
11392 * Trim the whole filesystem by:
11393 * 1) trimming the free space in each block group
11394 * 2) trimming the unallocated space on each device
11396 * This will also continue trimming even if a block group or device encounters
11397 * an error. The return value will be the last error, or 0 if nothing bad
11400 int btrfs_trim_fs(struct btrfs_fs_info
*fs_info
, struct fstrim_range
*range
)
11402 struct btrfs_block_group_cache
*cache
= NULL
;
11403 struct btrfs_device
*device
;
11404 struct list_head
*devices
;
11410 u64 dev_failed
= 0;
11415 cache
= btrfs_lookup_first_block_group(fs_info
, range
->start
);
11416 for (; cache
; cache
= next_block_group(fs_info
, cache
)) {
11417 if (cache
->key
.objectid
>= (range
->start
+ range
->len
)) {
11418 btrfs_put_block_group(cache
);
11422 start
= max(range
->start
, cache
->key
.objectid
);
11423 end
= min(range
->start
+ range
->len
,
11424 cache
->key
.objectid
+ cache
->key
.offset
);
11426 if (end
- start
>= range
->minlen
) {
11427 if (!block_group_cache_done(cache
)) {
11428 ret
= cache_block_group(cache
, 0);
11434 ret
= wait_block_group_cache_done(cache
);
11441 ret
= btrfs_trim_block_group(cache
,
11447 trimmed
+= group_trimmed
;
11457 btrfs_warn(fs_info
,
11458 "failed to trim %llu block group(s), last error %d",
11459 bg_failed
, bg_ret
);
11460 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
11461 devices
= &fs_info
->fs_devices
->devices
;
11462 list_for_each_entry(device
, devices
, dev_list
) {
11463 ret
= btrfs_trim_free_extents(device
, range
->minlen
,
11471 trimmed
+= group_trimmed
;
11473 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
11476 btrfs_warn(fs_info
,
11477 "failed to trim %llu device(s), last error %d",
11478 dev_failed
, dev_ret
);
11479 range
->len
= trimmed
;
11486 * btrfs_{start,end}_write_no_snapshotting() are similar to
11487 * mnt_{want,drop}_write(), they are used to prevent some tasks from writing
11488 * data into the page cache through nocow before the subvolume is snapshoted,
11489 * but flush the data into disk after the snapshot creation, or to prevent
11490 * operations while snapshotting is ongoing and that cause the snapshot to be
11491 * inconsistent (writes followed by expanding truncates for example).
11493 void btrfs_end_write_no_snapshotting(struct btrfs_root
*root
)
11495 percpu_counter_dec(&root
->subv_writers
->counter
);
11496 cond_wake_up(&root
->subv_writers
->wait
);
11499 int btrfs_start_write_no_snapshotting(struct btrfs_root
*root
)
11501 if (atomic_read(&root
->will_be_snapshotted
))
11504 percpu_counter_inc(&root
->subv_writers
->counter
);
11506 * Make sure counter is updated before we check for snapshot creation.
11509 if (atomic_read(&root
->will_be_snapshotted
)) {
11510 btrfs_end_write_no_snapshotting(root
);
11516 void btrfs_wait_for_snapshot_creation(struct btrfs_root
*root
)
11521 ret
= btrfs_start_write_no_snapshotting(root
);
11524 wait_var_event(&root
->will_be_snapshotted
,
11525 !atomic_read(&root
->will_be_snapshotted
));
11529 void btrfs_mark_bg_unused(struct btrfs_block_group_cache
*bg
)
11531 struct btrfs_fs_info
*fs_info
= bg
->fs_info
;
11533 spin_lock(&fs_info
->unused_bgs_lock
);
11534 if (list_empty(&bg
->bg_list
)) {
11535 btrfs_get_block_group(bg
);
11536 trace_btrfs_add_unused_block_group(bg
);
11537 list_add_tail(&bg
->bg_list
, &fs_info
->unused_bgs
);
11539 spin_unlock(&fs_info
->unused_bgs_lock
);