2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
18 #include <linux/sched.h>
19 #include <linux/pagemap.h>
20 #include <linux/writeback.h>
21 #include <linux/blkdev.h>
22 #include <linux/sort.h>
23 #include <linux/rcupdate.h>
24 #include <linux/kthread.h>
25 #include <linux/slab.h>
26 #include <linux/ratelimit.h>
27 #include <linux/percpu_counter.h>
31 #include "print-tree.h"
35 #include "free-space-cache.h"
40 #undef SCRAMBLE_DELAYED_REFS
43 * control flags for do_chunk_alloc's force field
44 * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk
45 * if we really need one.
47 * CHUNK_ALLOC_LIMITED means to only try and allocate one
48 * if we have very few chunks already allocated. This is
49 * used as part of the clustering code to help make sure
50 * we have a good pool of storage to cluster in, without
51 * filling the FS with empty chunks
53 * CHUNK_ALLOC_FORCE means it must try to allocate one
57 CHUNK_ALLOC_NO_FORCE
= 0,
58 CHUNK_ALLOC_LIMITED
= 1,
59 CHUNK_ALLOC_FORCE
= 2,
63 * Control how reservations are dealt with.
65 * RESERVE_FREE - freeing a reservation.
66 * RESERVE_ALLOC - allocating space and we need to update bytes_may_use for
68 * RESERVE_ALLOC_NO_ACCOUNT - allocating space and we should not update
69 * bytes_may_use as the ENOSPC accounting is done elsewhere
74 RESERVE_ALLOC_NO_ACCOUNT
= 2,
77 static int update_block_group(struct btrfs_root
*root
,
78 u64 bytenr
, u64 num_bytes
, int alloc
);
79 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
80 struct btrfs_root
*root
,
81 u64 bytenr
, u64 num_bytes
, u64 parent
,
82 u64 root_objectid
, u64 owner_objectid
,
83 u64 owner_offset
, int refs_to_drop
,
84 struct btrfs_delayed_extent_op
*extra_op
,
86 static void __run_delayed_extent_op(struct btrfs_delayed_extent_op
*extent_op
,
87 struct extent_buffer
*leaf
,
88 struct btrfs_extent_item
*ei
);
89 static int alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
90 struct btrfs_root
*root
,
91 u64 parent
, u64 root_objectid
,
92 u64 flags
, u64 owner
, u64 offset
,
93 struct btrfs_key
*ins
, int ref_mod
);
94 static int alloc_reserved_tree_block(struct btrfs_trans_handle
*trans
,
95 struct btrfs_root
*root
,
96 u64 parent
, u64 root_objectid
,
97 u64 flags
, struct btrfs_disk_key
*key
,
98 int level
, struct btrfs_key
*ins
,
100 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
,
101 struct btrfs_root
*extent_root
, u64 flags
,
103 static int find_next_key(struct btrfs_path
*path
, int level
,
104 struct btrfs_key
*key
);
105 static void dump_space_info(struct btrfs_space_info
*info
, u64 bytes
,
106 int dump_block_groups
);
107 static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache
*cache
,
108 u64 num_bytes
, int reserve
,
110 static int block_rsv_use_bytes(struct btrfs_block_rsv
*block_rsv
,
112 int btrfs_pin_extent(struct btrfs_root
*root
,
113 u64 bytenr
, u64 num_bytes
, int reserved
);
116 block_group_cache_done(struct btrfs_block_group_cache
*cache
)
119 return cache
->cached
== BTRFS_CACHE_FINISHED
||
120 cache
->cached
== BTRFS_CACHE_ERROR
;
123 static int block_group_bits(struct btrfs_block_group_cache
*cache
, u64 bits
)
125 return (cache
->flags
& bits
) == bits
;
128 static void btrfs_get_block_group(struct btrfs_block_group_cache
*cache
)
130 atomic_inc(&cache
->count
);
133 void btrfs_put_block_group(struct btrfs_block_group_cache
*cache
)
135 if (atomic_dec_and_test(&cache
->count
)) {
136 WARN_ON(cache
->pinned
> 0);
137 WARN_ON(cache
->reserved
> 0);
138 kfree(cache
->free_space_ctl
);
144 * this adds the block group to the fs_info rb tree for the block group
147 static int btrfs_add_block_group_cache(struct btrfs_fs_info
*info
,
148 struct btrfs_block_group_cache
*block_group
)
151 struct rb_node
*parent
= NULL
;
152 struct btrfs_block_group_cache
*cache
;
154 spin_lock(&info
->block_group_cache_lock
);
155 p
= &info
->block_group_cache_tree
.rb_node
;
159 cache
= rb_entry(parent
, struct btrfs_block_group_cache
,
161 if (block_group
->key
.objectid
< cache
->key
.objectid
) {
163 } else if (block_group
->key
.objectid
> cache
->key
.objectid
) {
166 spin_unlock(&info
->block_group_cache_lock
);
171 rb_link_node(&block_group
->cache_node
, parent
, p
);
172 rb_insert_color(&block_group
->cache_node
,
173 &info
->block_group_cache_tree
);
175 if (info
->first_logical_byte
> block_group
->key
.objectid
)
176 info
->first_logical_byte
= block_group
->key
.objectid
;
178 spin_unlock(&info
->block_group_cache_lock
);
184 * This will return the block group at or after bytenr if contains is 0, else
185 * it will return the block group that contains the bytenr
187 static struct btrfs_block_group_cache
*
188 block_group_cache_tree_search(struct btrfs_fs_info
*info
, u64 bytenr
,
191 struct btrfs_block_group_cache
*cache
, *ret
= NULL
;
195 spin_lock(&info
->block_group_cache_lock
);
196 n
= info
->block_group_cache_tree
.rb_node
;
199 cache
= rb_entry(n
, struct btrfs_block_group_cache
,
201 end
= cache
->key
.objectid
+ cache
->key
.offset
- 1;
202 start
= cache
->key
.objectid
;
204 if (bytenr
< start
) {
205 if (!contains
&& (!ret
|| start
< ret
->key
.objectid
))
208 } else if (bytenr
> start
) {
209 if (contains
&& bytenr
<= end
) {
220 btrfs_get_block_group(ret
);
221 if (bytenr
== 0 && info
->first_logical_byte
> ret
->key
.objectid
)
222 info
->first_logical_byte
= ret
->key
.objectid
;
224 spin_unlock(&info
->block_group_cache_lock
);
229 static int add_excluded_extent(struct btrfs_root
*root
,
230 u64 start
, u64 num_bytes
)
232 u64 end
= start
+ num_bytes
- 1;
233 set_extent_bits(&root
->fs_info
->freed_extents
[0],
234 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
235 set_extent_bits(&root
->fs_info
->freed_extents
[1],
236 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
240 static void free_excluded_extents(struct btrfs_root
*root
,
241 struct btrfs_block_group_cache
*cache
)
245 start
= cache
->key
.objectid
;
246 end
= start
+ cache
->key
.offset
- 1;
248 clear_extent_bits(&root
->fs_info
->freed_extents
[0],
249 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
250 clear_extent_bits(&root
->fs_info
->freed_extents
[1],
251 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
254 static int exclude_super_stripes(struct btrfs_root
*root
,
255 struct btrfs_block_group_cache
*cache
)
262 if (cache
->key
.objectid
< BTRFS_SUPER_INFO_OFFSET
) {
263 stripe_len
= BTRFS_SUPER_INFO_OFFSET
- cache
->key
.objectid
;
264 cache
->bytes_super
+= stripe_len
;
265 ret
= add_excluded_extent(root
, cache
->key
.objectid
,
271 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
272 bytenr
= btrfs_sb_offset(i
);
273 ret
= btrfs_rmap_block(&root
->fs_info
->mapping_tree
,
274 cache
->key
.objectid
, bytenr
,
275 0, &logical
, &nr
, &stripe_len
);
282 if (logical
[nr
] > cache
->key
.objectid
+
286 if (logical
[nr
] + stripe_len
<= cache
->key
.objectid
)
290 if (start
< cache
->key
.objectid
) {
291 start
= cache
->key
.objectid
;
292 len
= (logical
[nr
] + stripe_len
) - start
;
294 len
= min_t(u64
, stripe_len
,
295 cache
->key
.objectid
+
296 cache
->key
.offset
- start
);
299 cache
->bytes_super
+= len
;
300 ret
= add_excluded_extent(root
, start
, len
);
312 static struct btrfs_caching_control
*
313 get_caching_control(struct btrfs_block_group_cache
*cache
)
315 struct btrfs_caching_control
*ctl
;
317 spin_lock(&cache
->lock
);
318 if (!cache
->caching_ctl
) {
319 spin_unlock(&cache
->lock
);
323 ctl
= cache
->caching_ctl
;
324 atomic_inc(&ctl
->count
);
325 spin_unlock(&cache
->lock
);
329 static void put_caching_control(struct btrfs_caching_control
*ctl
)
331 if (atomic_dec_and_test(&ctl
->count
))
336 * this is only called by cache_block_group, since we could have freed extents
337 * we need to check the pinned_extents for any extents that can't be used yet
338 * since their free space will be released as soon as the transaction commits.
340 static u64
add_new_free_space(struct btrfs_block_group_cache
*block_group
,
341 struct btrfs_fs_info
*info
, u64 start
, u64 end
)
343 u64 extent_start
, extent_end
, size
, total_added
= 0;
346 while (start
< end
) {
347 ret
= find_first_extent_bit(info
->pinned_extents
, start
,
348 &extent_start
, &extent_end
,
349 EXTENT_DIRTY
| EXTENT_UPTODATE
,
354 if (extent_start
<= start
) {
355 start
= extent_end
+ 1;
356 } else if (extent_start
> start
&& extent_start
< end
) {
357 size
= extent_start
- start
;
359 ret
= btrfs_add_free_space(block_group
, start
,
361 BUG_ON(ret
); /* -ENOMEM or logic error */
362 start
= extent_end
+ 1;
371 ret
= btrfs_add_free_space(block_group
, start
, size
);
372 BUG_ON(ret
); /* -ENOMEM or logic error */
378 static noinline
void caching_thread(struct btrfs_work
*work
)
380 struct btrfs_block_group_cache
*block_group
;
381 struct btrfs_fs_info
*fs_info
;
382 struct btrfs_caching_control
*caching_ctl
;
383 struct btrfs_root
*extent_root
;
384 struct btrfs_path
*path
;
385 struct extent_buffer
*leaf
;
386 struct btrfs_key key
;
392 caching_ctl
= container_of(work
, struct btrfs_caching_control
, work
);
393 block_group
= caching_ctl
->block_group
;
394 fs_info
= block_group
->fs_info
;
395 extent_root
= fs_info
->extent_root
;
397 path
= btrfs_alloc_path();
401 last
= max_t(u64
, block_group
->key
.objectid
, BTRFS_SUPER_INFO_OFFSET
);
404 * We don't want to deadlock with somebody trying to allocate a new
405 * extent for the extent root while also trying to search the extent
406 * root to add free space. So we skip locking and search the commit
407 * root, since its read-only
409 path
->skip_locking
= 1;
410 path
->search_commit_root
= 1;
415 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
417 mutex_lock(&caching_ctl
->mutex
);
418 /* need to make sure the commit_root doesn't disappear */
419 down_read(&fs_info
->commit_root_sem
);
422 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
426 leaf
= path
->nodes
[0];
427 nritems
= btrfs_header_nritems(leaf
);
430 if (btrfs_fs_closing(fs_info
) > 1) {
435 if (path
->slots
[0] < nritems
) {
436 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
438 ret
= find_next_key(path
, 0, &key
);
442 if (need_resched() ||
443 rwsem_is_contended(&fs_info
->commit_root_sem
)) {
444 caching_ctl
->progress
= last
;
445 btrfs_release_path(path
);
446 up_read(&fs_info
->commit_root_sem
);
447 mutex_unlock(&caching_ctl
->mutex
);
452 ret
= btrfs_next_leaf(extent_root
, path
);
457 leaf
= path
->nodes
[0];
458 nritems
= btrfs_header_nritems(leaf
);
462 if (key
.objectid
< last
) {
465 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
467 caching_ctl
->progress
= last
;
468 btrfs_release_path(path
);
472 if (key
.objectid
< block_group
->key
.objectid
) {
477 if (key
.objectid
>= block_group
->key
.objectid
+
478 block_group
->key
.offset
)
481 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
||
482 key
.type
== BTRFS_METADATA_ITEM_KEY
) {
483 total_found
+= add_new_free_space(block_group
,
486 if (key
.type
== BTRFS_METADATA_ITEM_KEY
)
487 last
= key
.objectid
+
488 fs_info
->tree_root
->nodesize
;
490 last
= key
.objectid
+ key
.offset
;
492 if (total_found
> (1024 * 1024 * 2)) {
494 wake_up(&caching_ctl
->wait
);
501 total_found
+= add_new_free_space(block_group
, fs_info
, last
,
502 block_group
->key
.objectid
+
503 block_group
->key
.offset
);
504 caching_ctl
->progress
= (u64
)-1;
506 spin_lock(&block_group
->lock
);
507 block_group
->caching_ctl
= NULL
;
508 block_group
->cached
= BTRFS_CACHE_FINISHED
;
509 spin_unlock(&block_group
->lock
);
512 btrfs_free_path(path
);
513 up_read(&fs_info
->commit_root_sem
);
515 free_excluded_extents(extent_root
, block_group
);
517 mutex_unlock(&caching_ctl
->mutex
);
520 spin_lock(&block_group
->lock
);
521 block_group
->caching_ctl
= NULL
;
522 block_group
->cached
= BTRFS_CACHE_ERROR
;
523 spin_unlock(&block_group
->lock
);
525 wake_up(&caching_ctl
->wait
);
527 put_caching_control(caching_ctl
);
528 btrfs_put_block_group(block_group
);
531 static int cache_block_group(struct btrfs_block_group_cache
*cache
,
535 struct btrfs_fs_info
*fs_info
= cache
->fs_info
;
536 struct btrfs_caching_control
*caching_ctl
;
539 caching_ctl
= kzalloc(sizeof(*caching_ctl
), GFP_NOFS
);
543 INIT_LIST_HEAD(&caching_ctl
->list
);
544 mutex_init(&caching_ctl
->mutex
);
545 init_waitqueue_head(&caching_ctl
->wait
);
546 caching_ctl
->block_group
= cache
;
547 caching_ctl
->progress
= cache
->key
.objectid
;
548 atomic_set(&caching_ctl
->count
, 1);
549 btrfs_init_work(&caching_ctl
->work
, btrfs_cache_helper
,
550 caching_thread
, NULL
, NULL
);
552 spin_lock(&cache
->lock
);
554 * This should be a rare occasion, but this could happen I think in the
555 * case where one thread starts to load the space cache info, and then
556 * some other thread starts a transaction commit which tries to do an
557 * allocation while the other thread is still loading the space cache
558 * info. The previous loop should have kept us from choosing this block
559 * group, but if we've moved to the state where we will wait on caching
560 * block groups we need to first check if we're doing a fast load here,
561 * so we can wait for it to finish, otherwise we could end up allocating
562 * from a block group who's cache gets evicted for one reason or
565 while (cache
->cached
== BTRFS_CACHE_FAST
) {
566 struct btrfs_caching_control
*ctl
;
568 ctl
= cache
->caching_ctl
;
569 atomic_inc(&ctl
->count
);
570 prepare_to_wait(&ctl
->wait
, &wait
, TASK_UNINTERRUPTIBLE
);
571 spin_unlock(&cache
->lock
);
575 finish_wait(&ctl
->wait
, &wait
);
576 put_caching_control(ctl
);
577 spin_lock(&cache
->lock
);
580 if (cache
->cached
!= BTRFS_CACHE_NO
) {
581 spin_unlock(&cache
->lock
);
585 WARN_ON(cache
->caching_ctl
);
586 cache
->caching_ctl
= caching_ctl
;
587 cache
->cached
= BTRFS_CACHE_FAST
;
588 spin_unlock(&cache
->lock
);
590 if (fs_info
->mount_opt
& BTRFS_MOUNT_SPACE_CACHE
) {
591 mutex_lock(&caching_ctl
->mutex
);
592 ret
= load_free_space_cache(fs_info
, cache
);
594 spin_lock(&cache
->lock
);
596 cache
->caching_ctl
= NULL
;
597 cache
->cached
= BTRFS_CACHE_FINISHED
;
598 cache
->last_byte_to_unpin
= (u64
)-1;
599 caching_ctl
->progress
= (u64
)-1;
601 if (load_cache_only
) {
602 cache
->caching_ctl
= NULL
;
603 cache
->cached
= BTRFS_CACHE_NO
;
605 cache
->cached
= BTRFS_CACHE_STARTED
;
606 cache
->has_caching_ctl
= 1;
609 spin_unlock(&cache
->lock
);
610 mutex_unlock(&caching_ctl
->mutex
);
612 wake_up(&caching_ctl
->wait
);
614 put_caching_control(caching_ctl
);
615 free_excluded_extents(fs_info
->extent_root
, cache
);
620 * We are not going to do the fast caching, set cached to the
621 * appropriate value and wakeup any waiters.
623 spin_lock(&cache
->lock
);
624 if (load_cache_only
) {
625 cache
->caching_ctl
= NULL
;
626 cache
->cached
= BTRFS_CACHE_NO
;
628 cache
->cached
= BTRFS_CACHE_STARTED
;
629 cache
->has_caching_ctl
= 1;
631 spin_unlock(&cache
->lock
);
632 wake_up(&caching_ctl
->wait
);
635 if (load_cache_only
) {
636 put_caching_control(caching_ctl
);
640 down_write(&fs_info
->commit_root_sem
);
641 atomic_inc(&caching_ctl
->count
);
642 list_add_tail(&caching_ctl
->list
, &fs_info
->caching_block_groups
);
643 up_write(&fs_info
->commit_root_sem
);
645 btrfs_get_block_group(cache
);
647 btrfs_queue_work(fs_info
->caching_workers
, &caching_ctl
->work
);
653 * return the block group that starts at or after bytenr
655 static struct btrfs_block_group_cache
*
656 btrfs_lookup_first_block_group(struct btrfs_fs_info
*info
, u64 bytenr
)
658 struct btrfs_block_group_cache
*cache
;
660 cache
= block_group_cache_tree_search(info
, bytenr
, 0);
666 * return the block group that contains the given bytenr
668 struct btrfs_block_group_cache
*btrfs_lookup_block_group(
669 struct btrfs_fs_info
*info
,
672 struct btrfs_block_group_cache
*cache
;
674 cache
= block_group_cache_tree_search(info
, bytenr
, 1);
679 static struct btrfs_space_info
*__find_space_info(struct btrfs_fs_info
*info
,
682 struct list_head
*head
= &info
->space_info
;
683 struct btrfs_space_info
*found
;
685 flags
&= BTRFS_BLOCK_GROUP_TYPE_MASK
;
688 list_for_each_entry_rcu(found
, head
, list
) {
689 if (found
->flags
& flags
) {
699 * after adding space to the filesystem, we need to clear the full flags
700 * on all the space infos.
702 void btrfs_clear_space_info_full(struct btrfs_fs_info
*info
)
704 struct list_head
*head
= &info
->space_info
;
705 struct btrfs_space_info
*found
;
708 list_for_each_entry_rcu(found
, head
, list
)
713 /* simple helper to search for an existing data extent at a given offset */
714 int btrfs_lookup_data_extent(struct btrfs_root
*root
, u64 start
, u64 len
)
717 struct btrfs_key key
;
718 struct btrfs_path
*path
;
720 path
= btrfs_alloc_path();
724 key
.objectid
= start
;
726 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
727 ret
= btrfs_search_slot(NULL
, root
->fs_info
->extent_root
, &key
, path
,
729 btrfs_free_path(path
);
734 * helper function to lookup reference count and flags of a tree block.
736 * the head node for delayed ref is used to store the sum of all the
737 * reference count modifications queued up in the rbtree. the head
738 * node may also store the extent flags to set. This way you can check
739 * to see what the reference count and extent flags would be if all of
740 * the delayed refs are not processed.
742 int btrfs_lookup_extent_info(struct btrfs_trans_handle
*trans
,
743 struct btrfs_root
*root
, u64 bytenr
,
744 u64 offset
, int metadata
, u64
*refs
, u64
*flags
)
746 struct btrfs_delayed_ref_head
*head
;
747 struct btrfs_delayed_ref_root
*delayed_refs
;
748 struct btrfs_path
*path
;
749 struct btrfs_extent_item
*ei
;
750 struct extent_buffer
*leaf
;
751 struct btrfs_key key
;
758 * If we don't have skinny metadata, don't bother doing anything
761 if (metadata
&& !btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
)) {
762 offset
= root
->nodesize
;
766 path
= btrfs_alloc_path();
771 path
->skip_locking
= 1;
772 path
->search_commit_root
= 1;
776 key
.objectid
= bytenr
;
779 key
.type
= BTRFS_METADATA_ITEM_KEY
;
781 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
783 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
,
788 if (ret
> 0 && metadata
&& key
.type
== BTRFS_METADATA_ITEM_KEY
) {
789 if (path
->slots
[0]) {
791 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
793 if (key
.objectid
== bytenr
&&
794 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
795 key
.offset
== root
->nodesize
)
801 leaf
= path
->nodes
[0];
802 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
803 if (item_size
>= sizeof(*ei
)) {
804 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
805 struct btrfs_extent_item
);
806 num_refs
= btrfs_extent_refs(leaf
, ei
);
807 extent_flags
= btrfs_extent_flags(leaf
, ei
);
809 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
810 struct btrfs_extent_item_v0
*ei0
;
811 BUG_ON(item_size
!= sizeof(*ei0
));
812 ei0
= btrfs_item_ptr(leaf
, path
->slots
[0],
813 struct btrfs_extent_item_v0
);
814 num_refs
= btrfs_extent_refs_v0(leaf
, ei0
);
815 /* FIXME: this isn't correct for data */
816 extent_flags
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
821 BUG_ON(num_refs
== 0);
831 delayed_refs
= &trans
->transaction
->delayed_refs
;
832 spin_lock(&delayed_refs
->lock
);
833 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
835 if (!mutex_trylock(&head
->mutex
)) {
836 atomic_inc(&head
->node
.refs
);
837 spin_unlock(&delayed_refs
->lock
);
839 btrfs_release_path(path
);
842 * Mutex was contended, block until it's released and try
845 mutex_lock(&head
->mutex
);
846 mutex_unlock(&head
->mutex
);
847 btrfs_put_delayed_ref(&head
->node
);
850 spin_lock(&head
->lock
);
851 if (head
->extent_op
&& head
->extent_op
->update_flags
)
852 extent_flags
|= head
->extent_op
->flags_to_set
;
854 BUG_ON(num_refs
== 0);
856 num_refs
+= head
->node
.ref_mod
;
857 spin_unlock(&head
->lock
);
858 mutex_unlock(&head
->mutex
);
860 spin_unlock(&delayed_refs
->lock
);
862 WARN_ON(num_refs
== 0);
866 *flags
= extent_flags
;
868 btrfs_free_path(path
);
873 * Back reference rules. Back refs have three main goals:
875 * 1) differentiate between all holders of references to an extent so that
876 * when a reference is dropped we can make sure it was a valid reference
877 * before freeing the extent.
879 * 2) Provide enough information to quickly find the holders of an extent
880 * if we notice a given block is corrupted or bad.
882 * 3) Make it easy to migrate blocks for FS shrinking or storage pool
883 * maintenance. This is actually the same as #2, but with a slightly
884 * different use case.
886 * There are two kinds of back refs. The implicit back refs is optimized
887 * for pointers in non-shared tree blocks. For a given pointer in a block,
888 * back refs of this kind provide information about the block's owner tree
889 * and the pointer's key. These information allow us to find the block by
890 * b-tree searching. The full back refs is for pointers in tree blocks not
891 * referenced by their owner trees. The location of tree block is recorded
892 * in the back refs. Actually the full back refs is generic, and can be
893 * used in all cases the implicit back refs is used. The major shortcoming
894 * of the full back refs is its overhead. Every time a tree block gets
895 * COWed, we have to update back refs entry for all pointers in it.
897 * For a newly allocated tree block, we use implicit back refs for
898 * pointers in it. This means most tree related operations only involve
899 * implicit back refs. For a tree block created in old transaction, the
900 * only way to drop a reference to it is COW it. So we can detect the
901 * event that tree block loses its owner tree's reference and do the
902 * back refs conversion.
904 * When a tree block is COW'd through a tree, there are four cases:
906 * The reference count of the block is one and the tree is the block's
907 * owner tree. Nothing to do in this case.
909 * The reference count of the block is one and the tree is not the
910 * block's owner tree. In this case, full back refs is used for pointers
911 * in the block. Remove these full back refs, add implicit back refs for
912 * every pointers in the new block.
914 * The reference count of the block is greater than one and the tree is
915 * the block's owner tree. In this case, implicit back refs is used for
916 * pointers in the block. Add full back refs for every pointers in the
917 * block, increase lower level extents' reference counts. The original
918 * implicit back refs are entailed to the new block.
920 * The reference count of the block is greater than one and the tree is
921 * not the block's owner tree. Add implicit back refs for every pointer in
922 * the new block, increase lower level extents' reference count.
924 * Back Reference Key composing:
926 * The key objectid corresponds to the first byte in the extent,
927 * The key type is used to differentiate between types of back refs.
928 * There are different meanings of the key offset for different types
931 * File extents can be referenced by:
933 * - multiple snapshots, subvolumes, or different generations in one subvol
934 * - different files inside a single subvolume
935 * - different offsets inside a file (bookend extents in file.c)
937 * The extent ref structure for the implicit back refs has fields for:
939 * - Objectid of the subvolume root
940 * - objectid of the file holding the reference
941 * - original offset in the file
942 * - how many bookend extents
944 * The key offset for the implicit back refs is hash of the first
947 * The extent ref structure for the full back refs has field for:
949 * - number of pointers in the tree leaf
951 * The key offset for the implicit back refs is the first byte of
954 * When a file extent is allocated, The implicit back refs is used.
955 * the fields are filled in:
957 * (root_key.objectid, inode objectid, offset in file, 1)
959 * When a file extent is removed file truncation, we find the
960 * corresponding implicit back refs and check the following fields:
962 * (btrfs_header_owner(leaf), inode objectid, offset in file)
964 * Btree extents can be referenced by:
966 * - Different subvolumes
968 * Both the implicit back refs and the full back refs for tree blocks
969 * only consist of key. The key offset for the implicit back refs is
970 * objectid of block's owner tree. The key offset for the full back refs
971 * is the first byte of parent block.
973 * When implicit back refs is used, information about the lowest key and
974 * level of the tree block are required. These information are stored in
975 * tree block info structure.
978 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
979 static int convert_extent_item_v0(struct btrfs_trans_handle
*trans
,
980 struct btrfs_root
*root
,
981 struct btrfs_path
*path
,
982 u64 owner
, u32 extra_size
)
984 struct btrfs_extent_item
*item
;
985 struct btrfs_extent_item_v0
*ei0
;
986 struct btrfs_extent_ref_v0
*ref0
;
987 struct btrfs_tree_block_info
*bi
;
988 struct extent_buffer
*leaf
;
989 struct btrfs_key key
;
990 struct btrfs_key found_key
;
991 u32 new_size
= sizeof(*item
);
995 leaf
= path
->nodes
[0];
996 BUG_ON(btrfs_item_size_nr(leaf
, path
->slots
[0]) != sizeof(*ei0
));
998 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
999 ei0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1000 struct btrfs_extent_item_v0
);
1001 refs
= btrfs_extent_refs_v0(leaf
, ei0
);
1003 if (owner
== (u64
)-1) {
1005 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
1006 ret
= btrfs_next_leaf(root
, path
);
1009 BUG_ON(ret
> 0); /* Corruption */
1010 leaf
= path
->nodes
[0];
1012 btrfs_item_key_to_cpu(leaf
, &found_key
,
1014 BUG_ON(key
.objectid
!= found_key
.objectid
);
1015 if (found_key
.type
!= BTRFS_EXTENT_REF_V0_KEY
) {
1019 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1020 struct btrfs_extent_ref_v0
);
1021 owner
= btrfs_ref_objectid_v0(leaf
, ref0
);
1025 btrfs_release_path(path
);
1027 if (owner
< BTRFS_FIRST_FREE_OBJECTID
)
1028 new_size
+= sizeof(*bi
);
1030 new_size
-= sizeof(*ei0
);
1031 ret
= btrfs_search_slot(trans
, root
, &key
, path
,
1032 new_size
+ extra_size
, 1);
1035 BUG_ON(ret
); /* Corruption */
1037 btrfs_extend_item(root
, path
, new_size
);
1039 leaf
= path
->nodes
[0];
1040 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1041 btrfs_set_extent_refs(leaf
, item
, refs
);
1042 /* FIXME: get real generation */
1043 btrfs_set_extent_generation(leaf
, item
, 0);
1044 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1045 btrfs_set_extent_flags(leaf
, item
,
1046 BTRFS_EXTENT_FLAG_TREE_BLOCK
|
1047 BTRFS_BLOCK_FLAG_FULL_BACKREF
);
1048 bi
= (struct btrfs_tree_block_info
*)(item
+ 1);
1049 /* FIXME: get first key of the block */
1050 memset_extent_buffer(leaf
, 0, (unsigned long)bi
, sizeof(*bi
));
1051 btrfs_set_tree_block_level(leaf
, bi
, (int)owner
);
1053 btrfs_set_extent_flags(leaf
, item
, BTRFS_EXTENT_FLAG_DATA
);
1055 btrfs_mark_buffer_dirty(leaf
);
1060 static u64
hash_extent_data_ref(u64 root_objectid
, u64 owner
, u64 offset
)
1062 u32 high_crc
= ~(u32
)0;
1063 u32 low_crc
= ~(u32
)0;
1066 lenum
= cpu_to_le64(root_objectid
);
1067 high_crc
= btrfs_crc32c(high_crc
, &lenum
, sizeof(lenum
));
1068 lenum
= cpu_to_le64(owner
);
1069 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
1070 lenum
= cpu_to_le64(offset
);
1071 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
1073 return ((u64
)high_crc
<< 31) ^ (u64
)low_crc
;
1076 static u64
hash_extent_data_ref_item(struct extent_buffer
*leaf
,
1077 struct btrfs_extent_data_ref
*ref
)
1079 return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf
, ref
),
1080 btrfs_extent_data_ref_objectid(leaf
, ref
),
1081 btrfs_extent_data_ref_offset(leaf
, ref
));
1084 static int match_extent_data_ref(struct extent_buffer
*leaf
,
1085 struct btrfs_extent_data_ref
*ref
,
1086 u64 root_objectid
, u64 owner
, u64 offset
)
1088 if (btrfs_extent_data_ref_root(leaf
, ref
) != root_objectid
||
1089 btrfs_extent_data_ref_objectid(leaf
, ref
) != owner
||
1090 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
1095 static noinline
int lookup_extent_data_ref(struct btrfs_trans_handle
*trans
,
1096 struct btrfs_root
*root
,
1097 struct btrfs_path
*path
,
1098 u64 bytenr
, u64 parent
,
1100 u64 owner
, u64 offset
)
1102 struct btrfs_key key
;
1103 struct btrfs_extent_data_ref
*ref
;
1104 struct extent_buffer
*leaf
;
1110 key
.objectid
= bytenr
;
1112 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1113 key
.offset
= parent
;
1115 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1116 key
.offset
= hash_extent_data_ref(root_objectid
,
1121 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1130 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1131 key
.type
= BTRFS_EXTENT_REF_V0_KEY
;
1132 btrfs_release_path(path
);
1133 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1144 leaf
= path
->nodes
[0];
1145 nritems
= btrfs_header_nritems(leaf
);
1147 if (path
->slots
[0] >= nritems
) {
1148 ret
= btrfs_next_leaf(root
, path
);
1154 leaf
= path
->nodes
[0];
1155 nritems
= btrfs_header_nritems(leaf
);
1159 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1160 if (key
.objectid
!= bytenr
||
1161 key
.type
!= BTRFS_EXTENT_DATA_REF_KEY
)
1164 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1165 struct btrfs_extent_data_ref
);
1167 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1170 btrfs_release_path(path
);
1182 static noinline
int insert_extent_data_ref(struct btrfs_trans_handle
*trans
,
1183 struct btrfs_root
*root
,
1184 struct btrfs_path
*path
,
1185 u64 bytenr
, u64 parent
,
1186 u64 root_objectid
, u64 owner
,
1187 u64 offset
, int refs_to_add
)
1189 struct btrfs_key key
;
1190 struct extent_buffer
*leaf
;
1195 key
.objectid
= bytenr
;
1197 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1198 key
.offset
= parent
;
1199 size
= sizeof(struct btrfs_shared_data_ref
);
1201 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1202 key
.offset
= hash_extent_data_ref(root_objectid
,
1204 size
= sizeof(struct btrfs_extent_data_ref
);
1207 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, size
);
1208 if (ret
&& ret
!= -EEXIST
)
1211 leaf
= path
->nodes
[0];
1213 struct btrfs_shared_data_ref
*ref
;
1214 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1215 struct btrfs_shared_data_ref
);
1217 btrfs_set_shared_data_ref_count(leaf
, ref
, refs_to_add
);
1219 num_refs
= btrfs_shared_data_ref_count(leaf
, ref
);
1220 num_refs
+= refs_to_add
;
1221 btrfs_set_shared_data_ref_count(leaf
, ref
, num_refs
);
1224 struct btrfs_extent_data_ref
*ref
;
1225 while (ret
== -EEXIST
) {
1226 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1227 struct btrfs_extent_data_ref
);
1228 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1231 btrfs_release_path(path
);
1233 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
1235 if (ret
&& ret
!= -EEXIST
)
1238 leaf
= path
->nodes
[0];
1240 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1241 struct btrfs_extent_data_ref
);
1243 btrfs_set_extent_data_ref_root(leaf
, ref
,
1245 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
1246 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
1247 btrfs_set_extent_data_ref_count(leaf
, ref
, refs_to_add
);
1249 num_refs
= btrfs_extent_data_ref_count(leaf
, ref
);
1250 num_refs
+= refs_to_add
;
1251 btrfs_set_extent_data_ref_count(leaf
, ref
, num_refs
);
1254 btrfs_mark_buffer_dirty(leaf
);
1257 btrfs_release_path(path
);
1261 static noinline
int remove_extent_data_ref(struct btrfs_trans_handle
*trans
,
1262 struct btrfs_root
*root
,
1263 struct btrfs_path
*path
,
1264 int refs_to_drop
, int *last_ref
)
1266 struct btrfs_key key
;
1267 struct btrfs_extent_data_ref
*ref1
= NULL
;
1268 struct btrfs_shared_data_ref
*ref2
= NULL
;
1269 struct extent_buffer
*leaf
;
1273 leaf
= path
->nodes
[0];
1274 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1276 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1277 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1278 struct btrfs_extent_data_ref
);
1279 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1280 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1281 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1282 struct btrfs_shared_data_ref
);
1283 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1284 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1285 } else if (key
.type
== BTRFS_EXTENT_REF_V0_KEY
) {
1286 struct btrfs_extent_ref_v0
*ref0
;
1287 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1288 struct btrfs_extent_ref_v0
);
1289 num_refs
= btrfs_ref_count_v0(leaf
, ref0
);
1295 BUG_ON(num_refs
< refs_to_drop
);
1296 num_refs
-= refs_to_drop
;
1298 if (num_refs
== 0) {
1299 ret
= btrfs_del_item(trans
, root
, path
);
1302 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
)
1303 btrfs_set_extent_data_ref_count(leaf
, ref1
, num_refs
);
1304 else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
)
1305 btrfs_set_shared_data_ref_count(leaf
, ref2
, num_refs
);
1306 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1308 struct btrfs_extent_ref_v0
*ref0
;
1309 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1310 struct btrfs_extent_ref_v0
);
1311 btrfs_set_ref_count_v0(leaf
, ref0
, num_refs
);
1314 btrfs_mark_buffer_dirty(leaf
);
1319 static noinline u32
extent_data_ref_count(struct btrfs_root
*root
,
1320 struct btrfs_path
*path
,
1321 struct btrfs_extent_inline_ref
*iref
)
1323 struct btrfs_key key
;
1324 struct extent_buffer
*leaf
;
1325 struct btrfs_extent_data_ref
*ref1
;
1326 struct btrfs_shared_data_ref
*ref2
;
1329 leaf
= path
->nodes
[0];
1330 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1332 if (btrfs_extent_inline_ref_type(leaf
, iref
) ==
1333 BTRFS_EXTENT_DATA_REF_KEY
) {
1334 ref1
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1335 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1337 ref2
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1338 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1340 } else if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1341 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1342 struct btrfs_extent_data_ref
);
1343 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1344 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1345 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1346 struct btrfs_shared_data_ref
);
1347 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1348 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1349 } else if (key
.type
== BTRFS_EXTENT_REF_V0_KEY
) {
1350 struct btrfs_extent_ref_v0
*ref0
;
1351 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1352 struct btrfs_extent_ref_v0
);
1353 num_refs
= btrfs_ref_count_v0(leaf
, ref0
);
1361 static noinline
int lookup_tree_block_ref(struct btrfs_trans_handle
*trans
,
1362 struct btrfs_root
*root
,
1363 struct btrfs_path
*path
,
1364 u64 bytenr
, u64 parent
,
1367 struct btrfs_key key
;
1370 key
.objectid
= bytenr
;
1372 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1373 key
.offset
= parent
;
1375 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1376 key
.offset
= root_objectid
;
1379 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1382 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1383 if (ret
== -ENOENT
&& parent
) {
1384 btrfs_release_path(path
);
1385 key
.type
= BTRFS_EXTENT_REF_V0_KEY
;
1386 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1394 static noinline
int insert_tree_block_ref(struct btrfs_trans_handle
*trans
,
1395 struct btrfs_root
*root
,
1396 struct btrfs_path
*path
,
1397 u64 bytenr
, u64 parent
,
1400 struct btrfs_key key
;
1403 key
.objectid
= bytenr
;
1405 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1406 key
.offset
= parent
;
1408 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1409 key
.offset
= root_objectid
;
1412 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, 0);
1413 btrfs_release_path(path
);
1417 static inline int extent_ref_type(u64 parent
, u64 owner
)
1420 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1422 type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1424 type
= BTRFS_TREE_BLOCK_REF_KEY
;
1427 type
= BTRFS_SHARED_DATA_REF_KEY
;
1429 type
= BTRFS_EXTENT_DATA_REF_KEY
;
1434 static int find_next_key(struct btrfs_path
*path
, int level
,
1435 struct btrfs_key
*key
)
1438 for (; level
< BTRFS_MAX_LEVEL
; level
++) {
1439 if (!path
->nodes
[level
])
1441 if (path
->slots
[level
] + 1 >=
1442 btrfs_header_nritems(path
->nodes
[level
]))
1445 btrfs_item_key_to_cpu(path
->nodes
[level
], key
,
1446 path
->slots
[level
] + 1);
1448 btrfs_node_key_to_cpu(path
->nodes
[level
], key
,
1449 path
->slots
[level
] + 1);
1456 * look for inline back ref. if back ref is found, *ref_ret is set
1457 * to the address of inline back ref, and 0 is returned.
1459 * if back ref isn't found, *ref_ret is set to the address where it
1460 * should be inserted, and -ENOENT is returned.
1462 * if insert is true and there are too many inline back refs, the path
1463 * points to the extent item, and -EAGAIN is returned.
1465 * NOTE: inline back refs are ordered in the same way that back ref
1466 * items in the tree are ordered.
1468 static noinline_for_stack
1469 int lookup_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1470 struct btrfs_root
*root
,
1471 struct btrfs_path
*path
,
1472 struct btrfs_extent_inline_ref
**ref_ret
,
1473 u64 bytenr
, u64 num_bytes
,
1474 u64 parent
, u64 root_objectid
,
1475 u64 owner
, u64 offset
, int insert
)
1477 struct btrfs_key key
;
1478 struct extent_buffer
*leaf
;
1479 struct btrfs_extent_item
*ei
;
1480 struct btrfs_extent_inline_ref
*iref
;
1490 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
1493 key
.objectid
= bytenr
;
1494 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1495 key
.offset
= num_bytes
;
1497 want
= extent_ref_type(parent
, owner
);
1499 extra_size
= btrfs_extent_inline_ref_size(want
);
1500 path
->keep_locks
= 1;
1505 * Owner is our parent level, so we can just add one to get the level
1506 * for the block we are interested in.
1508 if (skinny_metadata
&& owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1509 key
.type
= BTRFS_METADATA_ITEM_KEY
;
1514 ret
= btrfs_search_slot(trans
, root
, &key
, path
, extra_size
, 1);
1521 * We may be a newly converted file system which still has the old fat
1522 * extent entries for metadata, so try and see if we have one of those.
1524 if (ret
> 0 && skinny_metadata
) {
1525 skinny_metadata
= false;
1526 if (path
->slots
[0]) {
1528 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
1530 if (key
.objectid
== bytenr
&&
1531 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
1532 key
.offset
== num_bytes
)
1536 key
.objectid
= bytenr
;
1537 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1538 key
.offset
= num_bytes
;
1539 btrfs_release_path(path
);
1544 if (ret
&& !insert
) {
1547 } else if (WARN_ON(ret
)) {
1552 leaf
= path
->nodes
[0];
1553 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1554 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1555 if (item_size
< sizeof(*ei
)) {
1560 ret
= convert_extent_item_v0(trans
, root
, path
, owner
,
1566 leaf
= path
->nodes
[0];
1567 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1570 BUG_ON(item_size
< sizeof(*ei
));
1572 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1573 flags
= btrfs_extent_flags(leaf
, ei
);
1575 ptr
= (unsigned long)(ei
+ 1);
1576 end
= (unsigned long)ei
+ item_size
;
1578 if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
&& !skinny_metadata
) {
1579 ptr
+= sizeof(struct btrfs_tree_block_info
);
1589 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1590 type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1594 ptr
+= btrfs_extent_inline_ref_size(type
);
1598 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1599 struct btrfs_extent_data_ref
*dref
;
1600 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1601 if (match_extent_data_ref(leaf
, dref
, root_objectid
,
1606 if (hash_extent_data_ref_item(leaf
, dref
) <
1607 hash_extent_data_ref(root_objectid
, owner
, offset
))
1611 ref_offset
= btrfs_extent_inline_ref_offset(leaf
, iref
);
1613 if (parent
== ref_offset
) {
1617 if (ref_offset
< parent
)
1620 if (root_objectid
== ref_offset
) {
1624 if (ref_offset
< root_objectid
)
1628 ptr
+= btrfs_extent_inline_ref_size(type
);
1630 if (err
== -ENOENT
&& insert
) {
1631 if (item_size
+ extra_size
>=
1632 BTRFS_MAX_EXTENT_ITEM_SIZE(root
)) {
1637 * To add new inline back ref, we have to make sure
1638 * there is no corresponding back ref item.
1639 * For simplicity, we just do not add new inline back
1640 * ref if there is any kind of item for this block
1642 if (find_next_key(path
, 0, &key
) == 0 &&
1643 key
.objectid
== bytenr
&&
1644 key
.type
< BTRFS_BLOCK_GROUP_ITEM_KEY
) {
1649 *ref_ret
= (struct btrfs_extent_inline_ref
*)ptr
;
1652 path
->keep_locks
= 0;
1653 btrfs_unlock_up_safe(path
, 1);
1659 * helper to add new inline back ref
1661 static noinline_for_stack
1662 void setup_inline_extent_backref(struct btrfs_root
*root
,
1663 struct btrfs_path
*path
,
1664 struct btrfs_extent_inline_ref
*iref
,
1665 u64 parent
, u64 root_objectid
,
1666 u64 owner
, u64 offset
, int refs_to_add
,
1667 struct btrfs_delayed_extent_op
*extent_op
)
1669 struct extent_buffer
*leaf
;
1670 struct btrfs_extent_item
*ei
;
1673 unsigned long item_offset
;
1678 leaf
= path
->nodes
[0];
1679 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1680 item_offset
= (unsigned long)iref
- (unsigned long)ei
;
1682 type
= extent_ref_type(parent
, owner
);
1683 size
= btrfs_extent_inline_ref_size(type
);
1685 btrfs_extend_item(root
, path
, size
);
1687 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1688 refs
= btrfs_extent_refs(leaf
, ei
);
1689 refs
+= refs_to_add
;
1690 btrfs_set_extent_refs(leaf
, ei
, refs
);
1692 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1694 ptr
= (unsigned long)ei
+ item_offset
;
1695 end
= (unsigned long)ei
+ btrfs_item_size_nr(leaf
, path
->slots
[0]);
1696 if (ptr
< end
- size
)
1697 memmove_extent_buffer(leaf
, ptr
+ size
, ptr
,
1700 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1701 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
1702 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1703 struct btrfs_extent_data_ref
*dref
;
1704 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1705 btrfs_set_extent_data_ref_root(leaf
, dref
, root_objectid
);
1706 btrfs_set_extent_data_ref_objectid(leaf
, dref
, owner
);
1707 btrfs_set_extent_data_ref_offset(leaf
, dref
, offset
);
1708 btrfs_set_extent_data_ref_count(leaf
, dref
, refs_to_add
);
1709 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1710 struct btrfs_shared_data_ref
*sref
;
1711 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1712 btrfs_set_shared_data_ref_count(leaf
, sref
, refs_to_add
);
1713 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1714 } else if (type
== BTRFS_SHARED_BLOCK_REF_KEY
) {
1715 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1717 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
1719 btrfs_mark_buffer_dirty(leaf
);
1722 static int lookup_extent_backref(struct btrfs_trans_handle
*trans
,
1723 struct btrfs_root
*root
,
1724 struct btrfs_path
*path
,
1725 struct btrfs_extent_inline_ref
**ref_ret
,
1726 u64 bytenr
, u64 num_bytes
, u64 parent
,
1727 u64 root_objectid
, u64 owner
, u64 offset
)
1731 ret
= lookup_inline_extent_backref(trans
, root
, path
, ref_ret
,
1732 bytenr
, num_bytes
, parent
,
1733 root_objectid
, owner
, offset
, 0);
1737 btrfs_release_path(path
);
1740 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1741 ret
= lookup_tree_block_ref(trans
, root
, path
, bytenr
, parent
,
1744 ret
= lookup_extent_data_ref(trans
, root
, path
, bytenr
, parent
,
1745 root_objectid
, owner
, offset
);
1751 * helper to update/remove inline back ref
1753 static noinline_for_stack
1754 void update_inline_extent_backref(struct btrfs_root
*root
,
1755 struct btrfs_path
*path
,
1756 struct btrfs_extent_inline_ref
*iref
,
1758 struct btrfs_delayed_extent_op
*extent_op
,
1761 struct extent_buffer
*leaf
;
1762 struct btrfs_extent_item
*ei
;
1763 struct btrfs_extent_data_ref
*dref
= NULL
;
1764 struct btrfs_shared_data_ref
*sref
= NULL
;
1772 leaf
= path
->nodes
[0];
1773 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1774 refs
= btrfs_extent_refs(leaf
, ei
);
1775 WARN_ON(refs_to_mod
< 0 && refs
+ refs_to_mod
<= 0);
1776 refs
+= refs_to_mod
;
1777 btrfs_set_extent_refs(leaf
, ei
, refs
);
1779 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1781 type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1783 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1784 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1785 refs
= btrfs_extent_data_ref_count(leaf
, dref
);
1786 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1787 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1788 refs
= btrfs_shared_data_ref_count(leaf
, sref
);
1791 BUG_ON(refs_to_mod
!= -1);
1794 BUG_ON(refs_to_mod
< 0 && refs
< -refs_to_mod
);
1795 refs
+= refs_to_mod
;
1798 if (type
== BTRFS_EXTENT_DATA_REF_KEY
)
1799 btrfs_set_extent_data_ref_count(leaf
, dref
, refs
);
1801 btrfs_set_shared_data_ref_count(leaf
, sref
, refs
);
1804 size
= btrfs_extent_inline_ref_size(type
);
1805 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1806 ptr
= (unsigned long)iref
;
1807 end
= (unsigned long)ei
+ item_size
;
1808 if (ptr
+ size
< end
)
1809 memmove_extent_buffer(leaf
, ptr
, ptr
+ size
,
1812 btrfs_truncate_item(root
, path
, item_size
, 1);
1814 btrfs_mark_buffer_dirty(leaf
);
1817 static noinline_for_stack
1818 int insert_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1819 struct btrfs_root
*root
,
1820 struct btrfs_path
*path
,
1821 u64 bytenr
, u64 num_bytes
, u64 parent
,
1822 u64 root_objectid
, u64 owner
,
1823 u64 offset
, int refs_to_add
,
1824 struct btrfs_delayed_extent_op
*extent_op
)
1826 struct btrfs_extent_inline_ref
*iref
;
1829 ret
= lookup_inline_extent_backref(trans
, root
, path
, &iref
,
1830 bytenr
, num_bytes
, parent
,
1831 root_objectid
, owner
, offset
, 1);
1833 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
);
1834 update_inline_extent_backref(root
, path
, iref
,
1835 refs_to_add
, extent_op
, NULL
);
1836 } else if (ret
== -ENOENT
) {
1837 setup_inline_extent_backref(root
, path
, iref
, parent
,
1838 root_objectid
, owner
, offset
,
1839 refs_to_add
, extent_op
);
1845 static int insert_extent_backref(struct btrfs_trans_handle
*trans
,
1846 struct btrfs_root
*root
,
1847 struct btrfs_path
*path
,
1848 u64 bytenr
, u64 parent
, u64 root_objectid
,
1849 u64 owner
, u64 offset
, int refs_to_add
)
1852 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1853 BUG_ON(refs_to_add
!= 1);
1854 ret
= insert_tree_block_ref(trans
, root
, path
, bytenr
,
1855 parent
, root_objectid
);
1857 ret
= insert_extent_data_ref(trans
, root
, path
, bytenr
,
1858 parent
, root_objectid
,
1859 owner
, offset
, refs_to_add
);
1864 static int remove_extent_backref(struct btrfs_trans_handle
*trans
,
1865 struct btrfs_root
*root
,
1866 struct btrfs_path
*path
,
1867 struct btrfs_extent_inline_ref
*iref
,
1868 int refs_to_drop
, int is_data
, int *last_ref
)
1872 BUG_ON(!is_data
&& refs_to_drop
!= 1);
1874 update_inline_extent_backref(root
, path
, iref
,
1875 -refs_to_drop
, NULL
, last_ref
);
1876 } else if (is_data
) {
1877 ret
= remove_extent_data_ref(trans
, root
, path
, refs_to_drop
,
1881 ret
= btrfs_del_item(trans
, root
, path
);
1886 static int btrfs_issue_discard(struct block_device
*bdev
,
1889 return blkdev_issue_discard(bdev
, start
>> 9, len
>> 9, GFP_NOFS
, 0);
1892 static int btrfs_discard_extent(struct btrfs_root
*root
, u64 bytenr
,
1893 u64 num_bytes
, u64
*actual_bytes
)
1896 u64 discarded_bytes
= 0;
1897 struct btrfs_bio
*bbio
= NULL
;
1900 /* Tell the block device(s) that the sectors can be discarded */
1901 ret
= btrfs_map_block(root
->fs_info
, REQ_DISCARD
,
1902 bytenr
, &num_bytes
, &bbio
, 0);
1903 /* Error condition is -ENOMEM */
1905 struct btrfs_bio_stripe
*stripe
= bbio
->stripes
;
1909 for (i
= 0; i
< bbio
->num_stripes
; i
++, stripe
++) {
1910 if (!stripe
->dev
->can_discard
)
1913 ret
= btrfs_issue_discard(stripe
->dev
->bdev
,
1917 discarded_bytes
+= stripe
->length
;
1918 else if (ret
!= -EOPNOTSUPP
)
1919 break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */
1922 * Just in case we get back EOPNOTSUPP for some reason,
1923 * just ignore the return value so we don't screw up
1924 * people calling discard_extent.
1932 *actual_bytes
= discarded_bytes
;
1935 if (ret
== -EOPNOTSUPP
)
1940 /* Can return -ENOMEM */
1941 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1942 struct btrfs_root
*root
,
1943 u64 bytenr
, u64 num_bytes
, u64 parent
,
1944 u64 root_objectid
, u64 owner
, u64 offset
,
1948 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1950 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
&&
1951 root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
1953 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1954 ret
= btrfs_add_delayed_tree_ref(fs_info
, trans
, bytenr
,
1956 parent
, root_objectid
, (int)owner
,
1957 BTRFS_ADD_DELAYED_REF
, NULL
, no_quota
);
1959 ret
= btrfs_add_delayed_data_ref(fs_info
, trans
, bytenr
,
1961 parent
, root_objectid
, owner
, offset
,
1962 BTRFS_ADD_DELAYED_REF
, NULL
, no_quota
);
1967 static int __btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1968 struct btrfs_root
*root
,
1969 u64 bytenr
, u64 num_bytes
,
1970 u64 parent
, u64 root_objectid
,
1971 u64 owner
, u64 offset
, int refs_to_add
,
1973 struct btrfs_delayed_extent_op
*extent_op
)
1975 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1976 struct btrfs_path
*path
;
1977 struct extent_buffer
*leaf
;
1978 struct btrfs_extent_item
*item
;
1979 struct btrfs_key key
;
1982 enum btrfs_qgroup_operation_type type
= BTRFS_QGROUP_OPER_ADD_EXCL
;
1984 path
= btrfs_alloc_path();
1988 if (!is_fstree(root_objectid
) || !root
->fs_info
->quota_enabled
)
1992 path
->leave_spinning
= 1;
1993 /* this will setup the path even if it fails to insert the back ref */
1994 ret
= insert_inline_extent_backref(trans
, fs_info
->extent_root
, path
,
1995 bytenr
, num_bytes
, parent
,
1996 root_objectid
, owner
, offset
,
1997 refs_to_add
, extent_op
);
1998 if ((ret
< 0 && ret
!= -EAGAIN
) || (!ret
&& no_quota
))
2001 * Ok we were able to insert an inline extent and it appears to be a new
2002 * reference, deal with the qgroup accounting.
2004 if (!ret
&& !no_quota
) {
2005 ASSERT(root
->fs_info
->quota_enabled
);
2006 leaf
= path
->nodes
[0];
2007 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2008 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2009 struct btrfs_extent_item
);
2010 if (btrfs_extent_refs(leaf
, item
) > (u64
)refs_to_add
)
2011 type
= BTRFS_QGROUP_OPER_ADD_SHARED
;
2012 btrfs_release_path(path
);
2014 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
2015 bytenr
, num_bytes
, type
, 0);
2020 * Ok we had -EAGAIN which means we didn't have space to insert and
2021 * inline extent ref, so just update the reference count and add a
2024 leaf
= path
->nodes
[0];
2025 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2026 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2027 refs
= btrfs_extent_refs(leaf
, item
);
2029 type
= BTRFS_QGROUP_OPER_ADD_SHARED
;
2030 btrfs_set_extent_refs(leaf
, item
, refs
+ refs_to_add
);
2032 __run_delayed_extent_op(extent_op
, leaf
, item
);
2034 btrfs_mark_buffer_dirty(leaf
);
2035 btrfs_release_path(path
);
2038 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
2039 bytenr
, num_bytes
, type
, 0);
2045 path
->leave_spinning
= 1;
2046 /* now insert the actual backref */
2047 ret
= insert_extent_backref(trans
, root
->fs_info
->extent_root
,
2048 path
, bytenr
, parent
, root_objectid
,
2049 owner
, offset
, refs_to_add
);
2051 btrfs_abort_transaction(trans
, root
, ret
);
2053 btrfs_free_path(path
);
2057 static int run_delayed_data_ref(struct btrfs_trans_handle
*trans
,
2058 struct btrfs_root
*root
,
2059 struct btrfs_delayed_ref_node
*node
,
2060 struct btrfs_delayed_extent_op
*extent_op
,
2061 int insert_reserved
)
2064 struct btrfs_delayed_data_ref
*ref
;
2065 struct btrfs_key ins
;
2070 ins
.objectid
= node
->bytenr
;
2071 ins
.offset
= node
->num_bytes
;
2072 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2074 ref
= btrfs_delayed_node_to_data_ref(node
);
2075 trace_run_delayed_data_ref(node
, ref
, node
->action
);
2077 if (node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2078 parent
= ref
->parent
;
2079 ref_root
= ref
->root
;
2081 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2083 flags
|= extent_op
->flags_to_set
;
2084 ret
= alloc_reserved_file_extent(trans
, root
,
2085 parent
, ref_root
, flags
,
2086 ref
->objectid
, ref
->offset
,
2087 &ins
, node
->ref_mod
);
2088 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2089 ret
= __btrfs_inc_extent_ref(trans
, root
, node
->bytenr
,
2090 node
->num_bytes
, parent
,
2091 ref_root
, ref
->objectid
,
2092 ref
->offset
, node
->ref_mod
,
2093 node
->no_quota
, extent_op
);
2094 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2095 ret
= __btrfs_free_extent(trans
, root
, node
->bytenr
,
2096 node
->num_bytes
, parent
,
2097 ref_root
, ref
->objectid
,
2098 ref
->offset
, node
->ref_mod
,
2099 extent_op
, node
->no_quota
);
2106 static void __run_delayed_extent_op(struct btrfs_delayed_extent_op
*extent_op
,
2107 struct extent_buffer
*leaf
,
2108 struct btrfs_extent_item
*ei
)
2110 u64 flags
= btrfs_extent_flags(leaf
, ei
);
2111 if (extent_op
->update_flags
) {
2112 flags
|= extent_op
->flags_to_set
;
2113 btrfs_set_extent_flags(leaf
, ei
, flags
);
2116 if (extent_op
->update_key
) {
2117 struct btrfs_tree_block_info
*bi
;
2118 BUG_ON(!(flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
));
2119 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
2120 btrfs_set_tree_block_key(leaf
, bi
, &extent_op
->key
);
2124 static int run_delayed_extent_op(struct btrfs_trans_handle
*trans
,
2125 struct btrfs_root
*root
,
2126 struct btrfs_delayed_ref_node
*node
,
2127 struct btrfs_delayed_extent_op
*extent_op
)
2129 struct btrfs_key key
;
2130 struct btrfs_path
*path
;
2131 struct btrfs_extent_item
*ei
;
2132 struct extent_buffer
*leaf
;
2136 int metadata
= !extent_op
->is_data
;
2141 if (metadata
&& !btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
))
2144 path
= btrfs_alloc_path();
2148 key
.objectid
= node
->bytenr
;
2151 key
.type
= BTRFS_METADATA_ITEM_KEY
;
2152 key
.offset
= extent_op
->level
;
2154 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2155 key
.offset
= node
->num_bytes
;
2160 path
->leave_spinning
= 1;
2161 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
, &key
,
2169 if (path
->slots
[0] > 0) {
2171 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
2173 if (key
.objectid
== node
->bytenr
&&
2174 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
2175 key
.offset
== node
->num_bytes
)
2179 btrfs_release_path(path
);
2182 key
.objectid
= node
->bytenr
;
2183 key
.offset
= node
->num_bytes
;
2184 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2193 leaf
= path
->nodes
[0];
2194 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2195 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
2196 if (item_size
< sizeof(*ei
)) {
2197 ret
= convert_extent_item_v0(trans
, root
->fs_info
->extent_root
,
2203 leaf
= path
->nodes
[0];
2204 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2207 BUG_ON(item_size
< sizeof(*ei
));
2208 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2209 __run_delayed_extent_op(extent_op
, leaf
, ei
);
2211 btrfs_mark_buffer_dirty(leaf
);
2213 btrfs_free_path(path
);
2217 static int run_delayed_tree_ref(struct btrfs_trans_handle
*trans
,
2218 struct btrfs_root
*root
,
2219 struct btrfs_delayed_ref_node
*node
,
2220 struct btrfs_delayed_extent_op
*extent_op
,
2221 int insert_reserved
)
2224 struct btrfs_delayed_tree_ref
*ref
;
2225 struct btrfs_key ins
;
2228 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
2231 ref
= btrfs_delayed_node_to_tree_ref(node
);
2232 trace_run_delayed_tree_ref(node
, ref
, node
->action
);
2234 if (node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2235 parent
= ref
->parent
;
2236 ref_root
= ref
->root
;
2238 ins
.objectid
= node
->bytenr
;
2239 if (skinny_metadata
) {
2240 ins
.offset
= ref
->level
;
2241 ins
.type
= BTRFS_METADATA_ITEM_KEY
;
2243 ins
.offset
= node
->num_bytes
;
2244 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2247 BUG_ON(node
->ref_mod
!= 1);
2248 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2249 BUG_ON(!extent_op
|| !extent_op
->update_flags
);
2250 ret
= alloc_reserved_tree_block(trans
, root
,
2252 extent_op
->flags_to_set
,
2256 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2257 ret
= __btrfs_inc_extent_ref(trans
, root
, node
->bytenr
,
2258 node
->num_bytes
, parent
, ref_root
,
2259 ref
->level
, 0, 1, node
->no_quota
,
2261 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2262 ret
= __btrfs_free_extent(trans
, root
, node
->bytenr
,
2263 node
->num_bytes
, parent
, ref_root
,
2264 ref
->level
, 0, 1, extent_op
,
2272 /* helper function to actually process a single delayed ref entry */
2273 static int run_one_delayed_ref(struct btrfs_trans_handle
*trans
,
2274 struct btrfs_root
*root
,
2275 struct btrfs_delayed_ref_node
*node
,
2276 struct btrfs_delayed_extent_op
*extent_op
,
2277 int insert_reserved
)
2281 if (trans
->aborted
) {
2282 if (insert_reserved
)
2283 btrfs_pin_extent(root
, node
->bytenr
,
2284 node
->num_bytes
, 1);
2288 if (btrfs_delayed_ref_is_head(node
)) {
2289 struct btrfs_delayed_ref_head
*head
;
2291 * we've hit the end of the chain and we were supposed
2292 * to insert this extent into the tree. But, it got
2293 * deleted before we ever needed to insert it, so all
2294 * we have to do is clean up the accounting
2297 head
= btrfs_delayed_node_to_head(node
);
2298 trace_run_delayed_ref_head(node
, head
, node
->action
);
2300 if (insert_reserved
) {
2301 btrfs_pin_extent(root
, node
->bytenr
,
2302 node
->num_bytes
, 1);
2303 if (head
->is_data
) {
2304 ret
= btrfs_del_csums(trans
, root
,
2312 if (node
->type
== BTRFS_TREE_BLOCK_REF_KEY
||
2313 node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2314 ret
= run_delayed_tree_ref(trans
, root
, node
, extent_op
,
2316 else if (node
->type
== BTRFS_EXTENT_DATA_REF_KEY
||
2317 node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2318 ret
= run_delayed_data_ref(trans
, root
, node
, extent_op
,
2325 static noinline
struct btrfs_delayed_ref_node
*
2326 select_delayed_ref(struct btrfs_delayed_ref_head
*head
)
2328 struct rb_node
*node
;
2329 struct btrfs_delayed_ref_node
*ref
, *last
= NULL
;;
2332 * select delayed ref of type BTRFS_ADD_DELAYED_REF first.
2333 * this prevents ref count from going down to zero when
2334 * there still are pending delayed ref.
2336 node
= rb_first(&head
->ref_root
);
2338 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
,
2340 if (ref
->action
== BTRFS_ADD_DELAYED_REF
)
2342 else if (last
== NULL
)
2344 node
= rb_next(node
);
2350 * Returns 0 on success or if called with an already aborted transaction.
2351 * Returns -ENOMEM or -EIO on failure and will abort the transaction.
2353 static noinline
int __btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2354 struct btrfs_root
*root
,
2357 struct btrfs_delayed_ref_root
*delayed_refs
;
2358 struct btrfs_delayed_ref_node
*ref
;
2359 struct btrfs_delayed_ref_head
*locked_ref
= NULL
;
2360 struct btrfs_delayed_extent_op
*extent_op
;
2361 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2362 ktime_t start
= ktime_get();
2364 unsigned long count
= 0;
2365 unsigned long actual_count
= 0;
2366 int must_insert_reserved
= 0;
2368 delayed_refs
= &trans
->transaction
->delayed_refs
;
2374 spin_lock(&delayed_refs
->lock
);
2375 locked_ref
= btrfs_select_ref_head(trans
);
2377 spin_unlock(&delayed_refs
->lock
);
2381 /* grab the lock that says we are going to process
2382 * all the refs for this head */
2383 ret
= btrfs_delayed_ref_lock(trans
, locked_ref
);
2384 spin_unlock(&delayed_refs
->lock
);
2386 * we may have dropped the spin lock to get the head
2387 * mutex lock, and that might have given someone else
2388 * time to free the head. If that's true, it has been
2389 * removed from our list and we can move on.
2391 if (ret
== -EAGAIN
) {
2399 * We need to try and merge add/drops of the same ref since we
2400 * can run into issues with relocate dropping the implicit ref
2401 * and then it being added back again before the drop can
2402 * finish. If we merged anything we need to re-loop so we can
2405 spin_lock(&locked_ref
->lock
);
2406 btrfs_merge_delayed_refs(trans
, fs_info
, delayed_refs
,
2410 * locked_ref is the head node, so we have to go one
2411 * node back for any delayed ref updates
2413 ref
= select_delayed_ref(locked_ref
);
2415 if (ref
&& ref
->seq
&&
2416 btrfs_check_delayed_seq(fs_info
, delayed_refs
, ref
->seq
)) {
2417 spin_unlock(&locked_ref
->lock
);
2418 btrfs_delayed_ref_unlock(locked_ref
);
2419 spin_lock(&delayed_refs
->lock
);
2420 locked_ref
->processing
= 0;
2421 delayed_refs
->num_heads_ready
++;
2422 spin_unlock(&delayed_refs
->lock
);
2430 * record the must insert reserved flag before we
2431 * drop the spin lock.
2433 must_insert_reserved
= locked_ref
->must_insert_reserved
;
2434 locked_ref
->must_insert_reserved
= 0;
2436 extent_op
= locked_ref
->extent_op
;
2437 locked_ref
->extent_op
= NULL
;
2442 /* All delayed refs have been processed, Go ahead
2443 * and send the head node to run_one_delayed_ref,
2444 * so that any accounting fixes can happen
2446 ref
= &locked_ref
->node
;
2448 if (extent_op
&& must_insert_reserved
) {
2449 btrfs_free_delayed_extent_op(extent_op
);
2454 spin_unlock(&locked_ref
->lock
);
2455 ret
= run_delayed_extent_op(trans
, root
,
2457 btrfs_free_delayed_extent_op(extent_op
);
2461 * Need to reset must_insert_reserved if
2462 * there was an error so the abort stuff
2463 * can cleanup the reserved space
2466 if (must_insert_reserved
)
2467 locked_ref
->must_insert_reserved
= 1;
2468 locked_ref
->processing
= 0;
2469 btrfs_debug(fs_info
, "run_delayed_extent_op returned %d", ret
);
2470 btrfs_delayed_ref_unlock(locked_ref
);
2477 * Need to drop our head ref lock and re-aqcuire the
2478 * delayed ref lock and then re-check to make sure
2481 spin_unlock(&locked_ref
->lock
);
2482 spin_lock(&delayed_refs
->lock
);
2483 spin_lock(&locked_ref
->lock
);
2484 if (rb_first(&locked_ref
->ref_root
) ||
2485 locked_ref
->extent_op
) {
2486 spin_unlock(&locked_ref
->lock
);
2487 spin_unlock(&delayed_refs
->lock
);
2491 delayed_refs
->num_heads
--;
2492 rb_erase(&locked_ref
->href_node
,
2493 &delayed_refs
->href_root
);
2494 spin_unlock(&delayed_refs
->lock
);
2498 rb_erase(&ref
->rb_node
, &locked_ref
->ref_root
);
2500 atomic_dec(&delayed_refs
->num_entries
);
2502 if (!btrfs_delayed_ref_is_head(ref
)) {
2504 * when we play the delayed ref, also correct the
2507 switch (ref
->action
) {
2508 case BTRFS_ADD_DELAYED_REF
:
2509 case BTRFS_ADD_DELAYED_EXTENT
:
2510 locked_ref
->node
.ref_mod
-= ref
->ref_mod
;
2512 case BTRFS_DROP_DELAYED_REF
:
2513 locked_ref
->node
.ref_mod
+= ref
->ref_mod
;
2519 spin_unlock(&locked_ref
->lock
);
2521 ret
= run_one_delayed_ref(trans
, root
, ref
, extent_op
,
2522 must_insert_reserved
);
2524 btrfs_free_delayed_extent_op(extent_op
);
2526 locked_ref
->processing
= 0;
2527 btrfs_delayed_ref_unlock(locked_ref
);
2528 btrfs_put_delayed_ref(ref
);
2529 btrfs_debug(fs_info
, "run_one_delayed_ref returned %d", ret
);
2534 * If this node is a head, that means all the refs in this head
2535 * have been dealt with, and we will pick the next head to deal
2536 * with, so we must unlock the head and drop it from the cluster
2537 * list before we release it.
2539 if (btrfs_delayed_ref_is_head(ref
)) {
2540 btrfs_delayed_ref_unlock(locked_ref
);
2543 btrfs_put_delayed_ref(ref
);
2549 * We don't want to include ref heads since we can have empty ref heads
2550 * and those will drastically skew our runtime down since we just do
2551 * accounting, no actual extent tree updates.
2553 if (actual_count
> 0) {
2554 u64 runtime
= ktime_to_ns(ktime_sub(ktime_get(), start
));
2558 * We weigh the current average higher than our current runtime
2559 * to avoid large swings in the average.
2561 spin_lock(&delayed_refs
->lock
);
2562 avg
= fs_info
->avg_delayed_ref_runtime
* 3 + runtime
;
2563 avg
= div64_u64(avg
, 4);
2564 fs_info
->avg_delayed_ref_runtime
= avg
;
2565 spin_unlock(&delayed_refs
->lock
);
2570 #ifdef SCRAMBLE_DELAYED_REFS
2572 * Normally delayed refs get processed in ascending bytenr order. This
2573 * correlates in most cases to the order added. To expose dependencies on this
2574 * order, we start to process the tree in the middle instead of the beginning
2576 static u64
find_middle(struct rb_root
*root
)
2578 struct rb_node
*n
= root
->rb_node
;
2579 struct btrfs_delayed_ref_node
*entry
;
2582 u64 first
= 0, last
= 0;
2586 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2587 first
= entry
->bytenr
;
2591 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2592 last
= entry
->bytenr
;
2597 entry
= rb_entry(n
, struct btrfs_delayed_ref_node
, rb_node
);
2598 WARN_ON(!entry
->in_tree
);
2600 middle
= entry
->bytenr
;
2613 static inline u64
heads_to_leaves(struct btrfs_root
*root
, u64 heads
)
2617 num_bytes
= heads
* (sizeof(struct btrfs_extent_item
) +
2618 sizeof(struct btrfs_extent_inline_ref
));
2619 if (!btrfs_fs_incompat(root
->fs_info
, SKINNY_METADATA
))
2620 num_bytes
+= heads
* sizeof(struct btrfs_tree_block_info
);
2623 * We don't ever fill up leaves all the way so multiply by 2 just to be
2624 * closer to what we're really going to want to ouse.
2626 return div64_u64(num_bytes
, BTRFS_LEAF_DATA_SIZE(root
));
2629 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle
*trans
,
2630 struct btrfs_root
*root
)
2632 struct btrfs_block_rsv
*global_rsv
;
2633 u64 num_heads
= trans
->transaction
->delayed_refs
.num_heads_ready
;
2637 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
2638 num_heads
= heads_to_leaves(root
, num_heads
);
2640 num_bytes
+= (num_heads
- 1) * root
->nodesize
;
2642 global_rsv
= &root
->fs_info
->global_block_rsv
;
2645 * If we can't allocate any more chunks lets make sure we have _lots_ of
2646 * wiggle room since running delayed refs can create more delayed refs.
2648 if (global_rsv
->space_info
->full
)
2651 spin_lock(&global_rsv
->lock
);
2652 if (global_rsv
->reserved
<= num_bytes
)
2654 spin_unlock(&global_rsv
->lock
);
2658 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle
*trans
,
2659 struct btrfs_root
*root
)
2661 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2663 atomic_read(&trans
->transaction
->delayed_refs
.num_entries
);
2668 avg_runtime
= fs_info
->avg_delayed_ref_runtime
;
2669 val
= num_entries
* avg_runtime
;
2670 if (num_entries
* avg_runtime
>= NSEC_PER_SEC
)
2672 if (val
>= NSEC_PER_SEC
/ 2)
2675 return btrfs_check_space_for_delayed_refs(trans
, root
);
2678 struct async_delayed_refs
{
2679 struct btrfs_root
*root
;
2683 struct completion wait
;
2684 struct btrfs_work work
;
2687 static void delayed_ref_async_start(struct btrfs_work
*work
)
2689 struct async_delayed_refs
*async
;
2690 struct btrfs_trans_handle
*trans
;
2693 async
= container_of(work
, struct async_delayed_refs
, work
);
2695 trans
= btrfs_join_transaction(async
->root
);
2696 if (IS_ERR(trans
)) {
2697 async
->error
= PTR_ERR(trans
);
2702 * trans->sync means that when we call end_transaciton, we won't
2703 * wait on delayed refs
2706 ret
= btrfs_run_delayed_refs(trans
, async
->root
, async
->count
);
2710 ret
= btrfs_end_transaction(trans
, async
->root
);
2711 if (ret
&& !async
->error
)
2715 complete(&async
->wait
);
2720 int btrfs_async_run_delayed_refs(struct btrfs_root
*root
,
2721 unsigned long count
, int wait
)
2723 struct async_delayed_refs
*async
;
2726 async
= kmalloc(sizeof(*async
), GFP_NOFS
);
2730 async
->root
= root
->fs_info
->tree_root
;
2731 async
->count
= count
;
2737 init_completion(&async
->wait
);
2739 btrfs_init_work(&async
->work
, btrfs_extent_refs_helper
,
2740 delayed_ref_async_start
, NULL
, NULL
);
2742 btrfs_queue_work(root
->fs_info
->extent_workers
, &async
->work
);
2745 wait_for_completion(&async
->wait
);
2754 * this starts processing the delayed reference count updates and
2755 * extent insertions we have queued up so far. count can be
2756 * 0, which means to process everything in the tree at the start
2757 * of the run (but not newly added entries), or it can be some target
2758 * number you'd like to process.
2760 * Returns 0 on success or if called with an aborted transaction
2761 * Returns <0 on error and aborts the transaction
2763 int btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2764 struct btrfs_root
*root
, unsigned long count
)
2766 struct rb_node
*node
;
2767 struct btrfs_delayed_ref_root
*delayed_refs
;
2768 struct btrfs_delayed_ref_head
*head
;
2770 int run_all
= count
== (unsigned long)-1;
2773 /* We'll clean this up in btrfs_cleanup_transaction */
2777 if (root
== root
->fs_info
->extent_root
)
2778 root
= root
->fs_info
->tree_root
;
2780 delayed_refs
= &trans
->transaction
->delayed_refs
;
2782 count
= atomic_read(&delayed_refs
->num_entries
) * 2;
2787 #ifdef SCRAMBLE_DELAYED_REFS
2788 delayed_refs
->run_delayed_start
= find_middle(&delayed_refs
->root
);
2790 ret
= __btrfs_run_delayed_refs(trans
, root
, count
);
2792 btrfs_abort_transaction(trans
, root
, ret
);
2797 if (!list_empty(&trans
->new_bgs
))
2798 btrfs_create_pending_block_groups(trans
, root
);
2800 spin_lock(&delayed_refs
->lock
);
2801 node
= rb_first(&delayed_refs
->href_root
);
2803 spin_unlock(&delayed_refs
->lock
);
2806 count
= (unsigned long)-1;
2809 head
= rb_entry(node
, struct btrfs_delayed_ref_head
,
2811 if (btrfs_delayed_ref_is_head(&head
->node
)) {
2812 struct btrfs_delayed_ref_node
*ref
;
2815 atomic_inc(&ref
->refs
);
2817 spin_unlock(&delayed_refs
->lock
);
2819 * Mutex was contended, block until it's
2820 * released and try again
2822 mutex_lock(&head
->mutex
);
2823 mutex_unlock(&head
->mutex
);
2825 btrfs_put_delayed_ref(ref
);
2831 node
= rb_next(node
);
2833 spin_unlock(&delayed_refs
->lock
);
2838 ret
= btrfs_delayed_qgroup_accounting(trans
, root
->fs_info
);
2841 assert_qgroups_uptodate(trans
);
2845 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle
*trans
,
2846 struct btrfs_root
*root
,
2847 u64 bytenr
, u64 num_bytes
, u64 flags
,
2848 int level
, int is_data
)
2850 struct btrfs_delayed_extent_op
*extent_op
;
2853 extent_op
= btrfs_alloc_delayed_extent_op();
2857 extent_op
->flags_to_set
= flags
;
2858 extent_op
->update_flags
= 1;
2859 extent_op
->update_key
= 0;
2860 extent_op
->is_data
= is_data
? 1 : 0;
2861 extent_op
->level
= level
;
2863 ret
= btrfs_add_delayed_extent_op(root
->fs_info
, trans
, bytenr
,
2864 num_bytes
, extent_op
);
2866 btrfs_free_delayed_extent_op(extent_op
);
2870 static noinline
int check_delayed_ref(struct btrfs_trans_handle
*trans
,
2871 struct btrfs_root
*root
,
2872 struct btrfs_path
*path
,
2873 u64 objectid
, u64 offset
, u64 bytenr
)
2875 struct btrfs_delayed_ref_head
*head
;
2876 struct btrfs_delayed_ref_node
*ref
;
2877 struct btrfs_delayed_data_ref
*data_ref
;
2878 struct btrfs_delayed_ref_root
*delayed_refs
;
2879 struct rb_node
*node
;
2882 delayed_refs
= &trans
->transaction
->delayed_refs
;
2883 spin_lock(&delayed_refs
->lock
);
2884 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
2886 spin_unlock(&delayed_refs
->lock
);
2890 if (!mutex_trylock(&head
->mutex
)) {
2891 atomic_inc(&head
->node
.refs
);
2892 spin_unlock(&delayed_refs
->lock
);
2894 btrfs_release_path(path
);
2897 * Mutex was contended, block until it's released and let
2900 mutex_lock(&head
->mutex
);
2901 mutex_unlock(&head
->mutex
);
2902 btrfs_put_delayed_ref(&head
->node
);
2905 spin_unlock(&delayed_refs
->lock
);
2907 spin_lock(&head
->lock
);
2908 node
= rb_first(&head
->ref_root
);
2910 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
, rb_node
);
2911 node
= rb_next(node
);
2913 /* If it's a shared ref we know a cross reference exists */
2914 if (ref
->type
!= BTRFS_EXTENT_DATA_REF_KEY
) {
2919 data_ref
= btrfs_delayed_node_to_data_ref(ref
);
2922 * If our ref doesn't match the one we're currently looking at
2923 * then we have a cross reference.
2925 if (data_ref
->root
!= root
->root_key
.objectid
||
2926 data_ref
->objectid
!= objectid
||
2927 data_ref
->offset
!= offset
) {
2932 spin_unlock(&head
->lock
);
2933 mutex_unlock(&head
->mutex
);
2937 static noinline
int check_committed_ref(struct btrfs_trans_handle
*trans
,
2938 struct btrfs_root
*root
,
2939 struct btrfs_path
*path
,
2940 u64 objectid
, u64 offset
, u64 bytenr
)
2942 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
2943 struct extent_buffer
*leaf
;
2944 struct btrfs_extent_data_ref
*ref
;
2945 struct btrfs_extent_inline_ref
*iref
;
2946 struct btrfs_extent_item
*ei
;
2947 struct btrfs_key key
;
2951 key
.objectid
= bytenr
;
2952 key
.offset
= (u64
)-1;
2953 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2955 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
2958 BUG_ON(ret
== 0); /* Corruption */
2961 if (path
->slots
[0] == 0)
2965 leaf
= path
->nodes
[0];
2966 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2968 if (key
.objectid
!= bytenr
|| key
.type
!= BTRFS_EXTENT_ITEM_KEY
)
2972 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2973 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
2974 if (item_size
< sizeof(*ei
)) {
2975 WARN_ON(item_size
!= sizeof(struct btrfs_extent_item_v0
));
2979 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2981 if (item_size
!= sizeof(*ei
) +
2982 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY
))
2985 if (btrfs_extent_generation(leaf
, ei
) <=
2986 btrfs_root_last_snapshot(&root
->root_item
))
2989 iref
= (struct btrfs_extent_inline_ref
*)(ei
+ 1);
2990 if (btrfs_extent_inline_ref_type(leaf
, iref
) !=
2991 BTRFS_EXTENT_DATA_REF_KEY
)
2994 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
2995 if (btrfs_extent_refs(leaf
, ei
) !=
2996 btrfs_extent_data_ref_count(leaf
, ref
) ||
2997 btrfs_extent_data_ref_root(leaf
, ref
) !=
2998 root
->root_key
.objectid
||
2999 btrfs_extent_data_ref_objectid(leaf
, ref
) != objectid
||
3000 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
3008 int btrfs_cross_ref_exist(struct btrfs_trans_handle
*trans
,
3009 struct btrfs_root
*root
,
3010 u64 objectid
, u64 offset
, u64 bytenr
)
3012 struct btrfs_path
*path
;
3016 path
= btrfs_alloc_path();
3021 ret
= check_committed_ref(trans
, root
, path
, objectid
,
3023 if (ret
&& ret
!= -ENOENT
)
3026 ret2
= check_delayed_ref(trans
, root
, path
, objectid
,
3028 } while (ret2
== -EAGAIN
);
3030 if (ret2
&& ret2
!= -ENOENT
) {
3035 if (ret
!= -ENOENT
|| ret2
!= -ENOENT
)
3038 btrfs_free_path(path
);
3039 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
3044 static int __btrfs_mod_ref(struct btrfs_trans_handle
*trans
,
3045 struct btrfs_root
*root
,
3046 struct extent_buffer
*buf
,
3047 int full_backref
, int inc
)
3054 struct btrfs_key key
;
3055 struct btrfs_file_extent_item
*fi
;
3059 int (*process_func
)(struct btrfs_trans_handle
*, struct btrfs_root
*,
3060 u64
, u64
, u64
, u64
, u64
, u64
, int);
3063 if (btrfs_test_is_dummy_root(root
))
3066 ref_root
= btrfs_header_owner(buf
);
3067 nritems
= btrfs_header_nritems(buf
);
3068 level
= btrfs_header_level(buf
);
3070 if (!test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) && level
== 0)
3074 process_func
= btrfs_inc_extent_ref
;
3076 process_func
= btrfs_free_extent
;
3079 parent
= buf
->start
;
3083 for (i
= 0; i
< nritems
; i
++) {
3085 btrfs_item_key_to_cpu(buf
, &key
, i
);
3086 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
3088 fi
= btrfs_item_ptr(buf
, i
,
3089 struct btrfs_file_extent_item
);
3090 if (btrfs_file_extent_type(buf
, fi
) ==
3091 BTRFS_FILE_EXTENT_INLINE
)
3093 bytenr
= btrfs_file_extent_disk_bytenr(buf
, fi
);
3097 num_bytes
= btrfs_file_extent_disk_num_bytes(buf
, fi
);
3098 key
.offset
-= btrfs_file_extent_offset(buf
, fi
);
3099 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
3100 parent
, ref_root
, key
.objectid
,
3105 bytenr
= btrfs_node_blockptr(buf
, i
);
3106 num_bytes
= root
->nodesize
;
3107 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
3108 parent
, ref_root
, level
- 1, 0,
3119 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3120 struct extent_buffer
*buf
, int full_backref
)
3122 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 1);
3125 int btrfs_dec_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3126 struct extent_buffer
*buf
, int full_backref
)
3128 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 0);
3131 static int write_one_cache_group(struct btrfs_trans_handle
*trans
,
3132 struct btrfs_root
*root
,
3133 struct btrfs_path
*path
,
3134 struct btrfs_block_group_cache
*cache
)
3137 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
3139 struct extent_buffer
*leaf
;
3141 ret
= btrfs_search_slot(trans
, extent_root
, &cache
->key
, path
, 0, 1);
3144 BUG_ON(ret
); /* Corruption */
3146 leaf
= path
->nodes
[0];
3147 bi
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
3148 write_extent_buffer(leaf
, &cache
->item
, bi
, sizeof(cache
->item
));
3149 btrfs_mark_buffer_dirty(leaf
);
3150 btrfs_release_path(path
);
3153 btrfs_abort_transaction(trans
, root
, ret
);
3160 static struct btrfs_block_group_cache
*
3161 next_block_group(struct btrfs_root
*root
,
3162 struct btrfs_block_group_cache
*cache
)
3164 struct rb_node
*node
;
3166 spin_lock(&root
->fs_info
->block_group_cache_lock
);
3168 /* If our block group was removed, we need a full search. */
3169 if (RB_EMPTY_NODE(&cache
->cache_node
)) {
3170 const u64 next_bytenr
= cache
->key
.objectid
+ cache
->key
.offset
;
3172 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
3173 btrfs_put_block_group(cache
);
3174 cache
= btrfs_lookup_first_block_group(root
->fs_info
,
3178 node
= rb_next(&cache
->cache_node
);
3179 btrfs_put_block_group(cache
);
3181 cache
= rb_entry(node
, struct btrfs_block_group_cache
,
3183 btrfs_get_block_group(cache
);
3186 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
3190 static int cache_save_setup(struct btrfs_block_group_cache
*block_group
,
3191 struct btrfs_trans_handle
*trans
,
3192 struct btrfs_path
*path
)
3194 struct btrfs_root
*root
= block_group
->fs_info
->tree_root
;
3195 struct inode
*inode
= NULL
;
3197 int dcs
= BTRFS_DC_ERROR
;
3203 * If this block group is smaller than 100 megs don't bother caching the
3206 if (block_group
->key
.offset
< (100 * 1024 * 1024)) {
3207 spin_lock(&block_group
->lock
);
3208 block_group
->disk_cache_state
= BTRFS_DC_WRITTEN
;
3209 spin_unlock(&block_group
->lock
);
3214 inode
= lookup_free_space_inode(root
, block_group
, path
);
3215 if (IS_ERR(inode
) && PTR_ERR(inode
) != -ENOENT
) {
3216 ret
= PTR_ERR(inode
);
3217 btrfs_release_path(path
);
3221 if (IS_ERR(inode
)) {
3225 if (block_group
->ro
)
3228 ret
= create_free_space_inode(root
, trans
, block_group
, path
);
3234 /* We've already setup this transaction, go ahead and exit */
3235 if (block_group
->cache_generation
== trans
->transid
&&
3236 i_size_read(inode
)) {
3237 dcs
= BTRFS_DC_SETUP
;
3242 * We want to set the generation to 0, that way if anything goes wrong
3243 * from here on out we know not to trust this cache when we load up next
3246 BTRFS_I(inode
)->generation
= 0;
3247 ret
= btrfs_update_inode(trans
, root
, inode
);
3250 if (i_size_read(inode
) > 0) {
3251 ret
= btrfs_check_trunc_cache_free_space(root
,
3252 &root
->fs_info
->global_block_rsv
);
3256 ret
= btrfs_truncate_free_space_cache(root
, trans
, inode
);
3261 spin_lock(&block_group
->lock
);
3262 if (block_group
->cached
!= BTRFS_CACHE_FINISHED
||
3263 !btrfs_test_opt(root
, SPACE_CACHE
) ||
3264 block_group
->delalloc_bytes
) {
3266 * don't bother trying to write stuff out _if_
3267 * a) we're not cached,
3268 * b) we're with nospace_cache mount option.
3270 dcs
= BTRFS_DC_WRITTEN
;
3271 spin_unlock(&block_group
->lock
);
3274 spin_unlock(&block_group
->lock
);
3277 * Try to preallocate enough space based on how big the block group is.
3278 * Keep in mind this has to include any pinned space which could end up
3279 * taking up quite a bit since it's not folded into the other space
3282 num_pages
= (int)div64_u64(block_group
->key
.offset
, 256 * 1024 * 1024);
3287 num_pages
*= PAGE_CACHE_SIZE
;
3289 ret
= btrfs_check_data_free_space(inode
, num_pages
);
3293 ret
= btrfs_prealloc_file_range_trans(inode
, trans
, 0, 0, num_pages
,
3294 num_pages
, num_pages
,
3297 dcs
= BTRFS_DC_SETUP
;
3298 btrfs_free_reserved_data_space(inode
, num_pages
);
3303 btrfs_release_path(path
);
3305 spin_lock(&block_group
->lock
);
3306 if (!ret
&& dcs
== BTRFS_DC_SETUP
)
3307 block_group
->cache_generation
= trans
->transid
;
3308 block_group
->disk_cache_state
= dcs
;
3309 spin_unlock(&block_group
->lock
);
3314 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
3315 struct btrfs_root
*root
)
3317 struct btrfs_block_group_cache
*cache
;
3319 struct btrfs_path
*path
;
3322 path
= btrfs_alloc_path();
3328 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
3330 if (cache
->disk_cache_state
== BTRFS_DC_CLEAR
)
3332 cache
= next_block_group(root
, cache
);
3340 err
= cache_save_setup(cache
, trans
, path
);
3341 last
= cache
->key
.objectid
+ cache
->key
.offset
;
3342 btrfs_put_block_group(cache
);
3347 err
= btrfs_run_delayed_refs(trans
, root
,
3349 if (err
) /* File system offline */
3353 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
3355 if (cache
->disk_cache_state
== BTRFS_DC_CLEAR
) {
3356 btrfs_put_block_group(cache
);
3362 cache
= next_block_group(root
, cache
);
3371 if (cache
->disk_cache_state
== BTRFS_DC_SETUP
)
3372 cache
->disk_cache_state
= BTRFS_DC_NEED_WRITE
;
3374 last
= cache
->key
.objectid
+ cache
->key
.offset
;
3376 err
= write_one_cache_group(trans
, root
, path
, cache
);
3377 btrfs_put_block_group(cache
);
3378 if (err
) /* File system offline */
3384 * I don't think this is needed since we're just marking our
3385 * preallocated extent as written, but just in case it can't
3389 err
= btrfs_run_delayed_refs(trans
, root
,
3391 if (err
) /* File system offline */
3395 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
3398 * Really this shouldn't happen, but it could if we
3399 * couldn't write the entire preallocated extent and
3400 * splitting the extent resulted in a new block.
3403 btrfs_put_block_group(cache
);
3406 if (cache
->disk_cache_state
== BTRFS_DC_NEED_WRITE
)
3408 cache
= next_block_group(root
, cache
);
3417 err
= btrfs_write_out_cache(root
, trans
, cache
, path
);
3420 * If we didn't have an error then the cache state is still
3421 * NEED_WRITE, so we can set it to WRITTEN.
3423 if (!err
&& cache
->disk_cache_state
== BTRFS_DC_NEED_WRITE
)
3424 cache
->disk_cache_state
= BTRFS_DC_WRITTEN
;
3425 last
= cache
->key
.objectid
+ cache
->key
.offset
;
3426 btrfs_put_block_group(cache
);
3430 btrfs_free_path(path
);
3434 int btrfs_extent_readonly(struct btrfs_root
*root
, u64 bytenr
)
3436 struct btrfs_block_group_cache
*block_group
;
3439 block_group
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
3440 if (!block_group
|| block_group
->ro
)
3443 btrfs_put_block_group(block_group
);
3447 static const char *alloc_name(u64 flags
)
3450 case BTRFS_BLOCK_GROUP_METADATA
|BTRFS_BLOCK_GROUP_DATA
:
3452 case BTRFS_BLOCK_GROUP_METADATA
:
3454 case BTRFS_BLOCK_GROUP_DATA
:
3456 case BTRFS_BLOCK_GROUP_SYSTEM
:
3460 return "invalid-combination";
3464 static int update_space_info(struct btrfs_fs_info
*info
, u64 flags
,
3465 u64 total_bytes
, u64 bytes_used
,
3466 struct btrfs_space_info
**space_info
)
3468 struct btrfs_space_info
*found
;
3473 if (flags
& (BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID1
|
3474 BTRFS_BLOCK_GROUP_RAID10
))
3479 found
= __find_space_info(info
, flags
);
3481 spin_lock(&found
->lock
);
3482 found
->total_bytes
+= total_bytes
;
3483 found
->disk_total
+= total_bytes
* factor
;
3484 found
->bytes_used
+= bytes_used
;
3485 found
->disk_used
+= bytes_used
* factor
;
3487 spin_unlock(&found
->lock
);
3488 *space_info
= found
;
3491 found
= kzalloc(sizeof(*found
), GFP_NOFS
);
3495 ret
= percpu_counter_init(&found
->total_bytes_pinned
, 0, GFP_KERNEL
);
3501 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++)
3502 INIT_LIST_HEAD(&found
->block_groups
[i
]);
3503 init_rwsem(&found
->groups_sem
);
3504 spin_lock_init(&found
->lock
);
3505 found
->flags
= flags
& BTRFS_BLOCK_GROUP_TYPE_MASK
;
3506 found
->total_bytes
= total_bytes
;
3507 found
->disk_total
= total_bytes
* factor
;
3508 found
->bytes_used
= bytes_used
;
3509 found
->disk_used
= bytes_used
* factor
;
3510 found
->bytes_pinned
= 0;
3511 found
->bytes_reserved
= 0;
3512 found
->bytes_readonly
= 0;
3513 found
->bytes_may_use
= 0;
3515 found
->force_alloc
= CHUNK_ALLOC_NO_FORCE
;
3516 found
->chunk_alloc
= 0;
3518 init_waitqueue_head(&found
->wait
);
3519 INIT_LIST_HEAD(&found
->ro_bgs
);
3521 ret
= kobject_init_and_add(&found
->kobj
, &space_info_ktype
,
3522 info
->space_info_kobj
, "%s",
3523 alloc_name(found
->flags
));
3529 *space_info
= found
;
3530 list_add_rcu(&found
->list
, &info
->space_info
);
3531 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3532 info
->data_sinfo
= found
;
3537 static void set_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
3539 u64 extra_flags
= chunk_to_extended(flags
) &
3540 BTRFS_EXTENDED_PROFILE_MASK
;
3542 write_seqlock(&fs_info
->profiles_lock
);
3543 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3544 fs_info
->avail_data_alloc_bits
|= extra_flags
;
3545 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
3546 fs_info
->avail_metadata_alloc_bits
|= extra_flags
;
3547 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
3548 fs_info
->avail_system_alloc_bits
|= extra_flags
;
3549 write_sequnlock(&fs_info
->profiles_lock
);
3553 * returns target flags in extended format or 0 if restripe for this
3554 * chunk_type is not in progress
3556 * should be called with either volume_mutex or balance_lock held
3558 static u64
get_restripe_target(struct btrfs_fs_info
*fs_info
, u64 flags
)
3560 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3566 if (flags
& BTRFS_BLOCK_GROUP_DATA
&&
3567 bctl
->data
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3568 target
= BTRFS_BLOCK_GROUP_DATA
| bctl
->data
.target
;
3569 } else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
&&
3570 bctl
->sys
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3571 target
= BTRFS_BLOCK_GROUP_SYSTEM
| bctl
->sys
.target
;
3572 } else if (flags
& BTRFS_BLOCK_GROUP_METADATA
&&
3573 bctl
->meta
.flags
& BTRFS_BALANCE_ARGS_CONVERT
) {
3574 target
= BTRFS_BLOCK_GROUP_METADATA
| bctl
->meta
.target
;
3581 * @flags: available profiles in extended format (see ctree.h)
3583 * Returns reduced profile in chunk format. If profile changing is in
3584 * progress (either running or paused) picks the target profile (if it's
3585 * already available), otherwise falls back to plain reducing.
3587 static u64
btrfs_reduce_alloc_profile(struct btrfs_root
*root
, u64 flags
)
3589 u64 num_devices
= root
->fs_info
->fs_devices
->rw_devices
;
3594 * see if restripe for this chunk_type is in progress, if so
3595 * try to reduce to the target profile
3597 spin_lock(&root
->fs_info
->balance_lock
);
3598 target
= get_restripe_target(root
->fs_info
, flags
);
3600 /* pick target profile only if it's already available */
3601 if ((flags
& target
) & BTRFS_EXTENDED_PROFILE_MASK
) {
3602 spin_unlock(&root
->fs_info
->balance_lock
);
3603 return extended_to_chunk(target
);
3606 spin_unlock(&root
->fs_info
->balance_lock
);
3608 /* First, mask out the RAID levels which aren't possible */
3609 if (num_devices
== 1)
3610 flags
&= ~(BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID0
|
3611 BTRFS_BLOCK_GROUP_RAID5
);
3612 if (num_devices
< 3)
3613 flags
&= ~BTRFS_BLOCK_GROUP_RAID6
;
3614 if (num_devices
< 4)
3615 flags
&= ~BTRFS_BLOCK_GROUP_RAID10
;
3617 tmp
= flags
& (BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID0
|
3618 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID5
|
3619 BTRFS_BLOCK_GROUP_RAID6
| BTRFS_BLOCK_GROUP_RAID10
);
3622 if (tmp
& BTRFS_BLOCK_GROUP_RAID6
)
3623 tmp
= BTRFS_BLOCK_GROUP_RAID6
;
3624 else if (tmp
& BTRFS_BLOCK_GROUP_RAID5
)
3625 tmp
= BTRFS_BLOCK_GROUP_RAID5
;
3626 else if (tmp
& BTRFS_BLOCK_GROUP_RAID10
)
3627 tmp
= BTRFS_BLOCK_GROUP_RAID10
;
3628 else if (tmp
& BTRFS_BLOCK_GROUP_RAID1
)
3629 tmp
= BTRFS_BLOCK_GROUP_RAID1
;
3630 else if (tmp
& BTRFS_BLOCK_GROUP_RAID0
)
3631 tmp
= BTRFS_BLOCK_GROUP_RAID0
;
3633 return extended_to_chunk(flags
| tmp
);
3636 static u64
get_alloc_profile(struct btrfs_root
*root
, u64 orig_flags
)
3643 seq
= read_seqbegin(&root
->fs_info
->profiles_lock
);
3645 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3646 flags
|= root
->fs_info
->avail_data_alloc_bits
;
3647 else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
3648 flags
|= root
->fs_info
->avail_system_alloc_bits
;
3649 else if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
3650 flags
|= root
->fs_info
->avail_metadata_alloc_bits
;
3651 } while (read_seqretry(&root
->fs_info
->profiles_lock
, seq
));
3653 return btrfs_reduce_alloc_profile(root
, flags
);
3656 u64
btrfs_get_alloc_profile(struct btrfs_root
*root
, int data
)
3662 flags
= BTRFS_BLOCK_GROUP_DATA
;
3663 else if (root
== root
->fs_info
->chunk_root
)
3664 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
3666 flags
= BTRFS_BLOCK_GROUP_METADATA
;
3668 ret
= get_alloc_profile(root
, flags
);
3673 * This will check the space that the inode allocates from to make sure we have
3674 * enough space for bytes.
3676 int btrfs_check_data_free_space(struct inode
*inode
, u64 bytes
)
3678 struct btrfs_space_info
*data_sinfo
;
3679 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3680 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3682 int ret
= 0, committed
= 0, alloc_chunk
= 1;
3684 /* make sure bytes are sectorsize aligned */
3685 bytes
= ALIGN(bytes
, root
->sectorsize
);
3687 if (btrfs_is_free_space_inode(inode
)) {
3689 ASSERT(current
->journal_info
);
3692 data_sinfo
= fs_info
->data_sinfo
;
3697 /* make sure we have enough space to handle the data first */
3698 spin_lock(&data_sinfo
->lock
);
3699 used
= data_sinfo
->bytes_used
+ data_sinfo
->bytes_reserved
+
3700 data_sinfo
->bytes_pinned
+ data_sinfo
->bytes_readonly
+
3701 data_sinfo
->bytes_may_use
;
3703 if (used
+ bytes
> data_sinfo
->total_bytes
) {
3704 struct btrfs_trans_handle
*trans
;
3707 * if we don't have enough free bytes in this space then we need
3708 * to alloc a new chunk.
3710 if (!data_sinfo
->full
&& alloc_chunk
) {
3713 data_sinfo
->force_alloc
= CHUNK_ALLOC_FORCE
;
3714 spin_unlock(&data_sinfo
->lock
);
3716 alloc_target
= btrfs_get_alloc_profile(root
, 1);
3718 * It is ugly that we don't call nolock join
3719 * transaction for the free space inode case here.
3720 * But it is safe because we only do the data space
3721 * reservation for the free space cache in the
3722 * transaction context, the common join transaction
3723 * just increase the counter of the current transaction
3724 * handler, doesn't try to acquire the trans_lock of
3727 trans
= btrfs_join_transaction(root
);
3729 return PTR_ERR(trans
);
3731 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
3733 CHUNK_ALLOC_NO_FORCE
);
3734 btrfs_end_transaction(trans
, root
);
3743 data_sinfo
= fs_info
->data_sinfo
;
3749 * If we don't have enough pinned space to deal with this
3750 * allocation don't bother committing the transaction.
3752 if (percpu_counter_compare(&data_sinfo
->total_bytes_pinned
,
3755 spin_unlock(&data_sinfo
->lock
);
3757 /* commit the current transaction and try again */
3760 !atomic_read(&root
->fs_info
->open_ioctl_trans
)) {
3763 trans
= btrfs_join_transaction(root
);
3765 return PTR_ERR(trans
);
3766 ret
= btrfs_commit_transaction(trans
, root
);
3772 trace_btrfs_space_reservation(root
->fs_info
,
3773 "space_info:enospc",
3774 data_sinfo
->flags
, bytes
, 1);
3777 data_sinfo
->bytes_may_use
+= bytes
;
3778 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
3779 data_sinfo
->flags
, bytes
, 1);
3780 spin_unlock(&data_sinfo
->lock
);
3786 * Called if we need to clear a data reservation for this inode.
3788 void btrfs_free_reserved_data_space(struct inode
*inode
, u64 bytes
)
3790 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3791 struct btrfs_space_info
*data_sinfo
;
3793 /* make sure bytes are sectorsize aligned */
3794 bytes
= ALIGN(bytes
, root
->sectorsize
);
3796 data_sinfo
= root
->fs_info
->data_sinfo
;
3797 spin_lock(&data_sinfo
->lock
);
3798 WARN_ON(data_sinfo
->bytes_may_use
< bytes
);
3799 data_sinfo
->bytes_may_use
-= bytes
;
3800 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
3801 data_sinfo
->flags
, bytes
, 0);
3802 spin_unlock(&data_sinfo
->lock
);
3805 static void force_metadata_allocation(struct btrfs_fs_info
*info
)
3807 struct list_head
*head
= &info
->space_info
;
3808 struct btrfs_space_info
*found
;
3811 list_for_each_entry_rcu(found
, head
, list
) {
3812 if (found
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
3813 found
->force_alloc
= CHUNK_ALLOC_FORCE
;
3818 static inline u64
calc_global_rsv_need_space(struct btrfs_block_rsv
*global
)
3820 return (global
->size
<< 1);
3823 static int should_alloc_chunk(struct btrfs_root
*root
,
3824 struct btrfs_space_info
*sinfo
, int force
)
3826 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
3827 u64 num_bytes
= sinfo
->total_bytes
- sinfo
->bytes_readonly
;
3828 u64 num_allocated
= sinfo
->bytes_used
+ sinfo
->bytes_reserved
;
3831 if (force
== CHUNK_ALLOC_FORCE
)
3835 * We need to take into account the global rsv because for all intents
3836 * and purposes it's used space. Don't worry about locking the
3837 * global_rsv, it doesn't change except when the transaction commits.
3839 if (sinfo
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
3840 num_allocated
+= calc_global_rsv_need_space(global_rsv
);
3843 * in limited mode, we want to have some free space up to
3844 * about 1% of the FS size.
3846 if (force
== CHUNK_ALLOC_LIMITED
) {
3847 thresh
= btrfs_super_total_bytes(root
->fs_info
->super_copy
);
3848 thresh
= max_t(u64
, 64 * 1024 * 1024,
3849 div_factor_fine(thresh
, 1));
3851 if (num_bytes
- num_allocated
< thresh
)
3855 if (num_allocated
+ 2 * 1024 * 1024 < div_factor(num_bytes
, 8))
3860 static u64
get_system_chunk_thresh(struct btrfs_root
*root
, u64 type
)
3864 if (type
& (BTRFS_BLOCK_GROUP_RAID10
|
3865 BTRFS_BLOCK_GROUP_RAID0
|
3866 BTRFS_BLOCK_GROUP_RAID5
|
3867 BTRFS_BLOCK_GROUP_RAID6
))
3868 num_dev
= root
->fs_info
->fs_devices
->rw_devices
;
3869 else if (type
& BTRFS_BLOCK_GROUP_RAID1
)
3872 num_dev
= 1; /* DUP or single */
3874 /* metadata for updaing devices and chunk tree */
3875 return btrfs_calc_trans_metadata_size(root
, num_dev
+ 1);
3878 static void check_system_chunk(struct btrfs_trans_handle
*trans
,
3879 struct btrfs_root
*root
, u64 type
)
3881 struct btrfs_space_info
*info
;
3885 info
= __find_space_info(root
->fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
3886 spin_lock(&info
->lock
);
3887 left
= info
->total_bytes
- info
->bytes_used
- info
->bytes_pinned
-
3888 info
->bytes_reserved
- info
->bytes_readonly
;
3889 spin_unlock(&info
->lock
);
3891 thresh
= get_system_chunk_thresh(root
, type
);
3892 if (left
< thresh
&& btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
3893 btrfs_info(root
->fs_info
, "left=%llu, need=%llu, flags=%llu",
3894 left
, thresh
, type
);
3895 dump_space_info(info
, 0, 0);
3898 if (left
< thresh
) {
3901 flags
= btrfs_get_alloc_profile(root
->fs_info
->chunk_root
, 0);
3902 btrfs_alloc_chunk(trans
, root
, flags
);
3906 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
,
3907 struct btrfs_root
*extent_root
, u64 flags
, int force
)
3909 struct btrfs_space_info
*space_info
;
3910 struct btrfs_fs_info
*fs_info
= extent_root
->fs_info
;
3911 int wait_for_alloc
= 0;
3914 /* Don't re-enter if we're already allocating a chunk */
3915 if (trans
->allocating_chunk
)
3918 space_info
= __find_space_info(extent_root
->fs_info
, flags
);
3920 ret
= update_space_info(extent_root
->fs_info
, flags
,
3922 BUG_ON(ret
); /* -ENOMEM */
3924 BUG_ON(!space_info
); /* Logic error */
3927 spin_lock(&space_info
->lock
);
3928 if (force
< space_info
->force_alloc
)
3929 force
= space_info
->force_alloc
;
3930 if (space_info
->full
) {
3931 if (should_alloc_chunk(extent_root
, space_info
, force
))
3935 spin_unlock(&space_info
->lock
);
3939 if (!should_alloc_chunk(extent_root
, space_info
, force
)) {
3940 spin_unlock(&space_info
->lock
);
3942 } else if (space_info
->chunk_alloc
) {
3945 space_info
->chunk_alloc
= 1;
3948 spin_unlock(&space_info
->lock
);
3950 mutex_lock(&fs_info
->chunk_mutex
);
3953 * The chunk_mutex is held throughout the entirety of a chunk
3954 * allocation, so once we've acquired the chunk_mutex we know that the
3955 * other guy is done and we need to recheck and see if we should
3958 if (wait_for_alloc
) {
3959 mutex_unlock(&fs_info
->chunk_mutex
);
3964 trans
->allocating_chunk
= true;
3967 * If we have mixed data/metadata chunks we want to make sure we keep
3968 * allocating mixed chunks instead of individual chunks.
3970 if (btrfs_mixed_space_info(space_info
))
3971 flags
|= (BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
);
3974 * if we're doing a data chunk, go ahead and make sure that
3975 * we keep a reasonable number of metadata chunks allocated in the
3978 if (flags
& BTRFS_BLOCK_GROUP_DATA
&& fs_info
->metadata_ratio
) {
3979 fs_info
->data_chunk_allocations
++;
3980 if (!(fs_info
->data_chunk_allocations
%
3981 fs_info
->metadata_ratio
))
3982 force_metadata_allocation(fs_info
);
3986 * Check if we have enough space in SYSTEM chunk because we may need
3987 * to update devices.
3989 check_system_chunk(trans
, extent_root
, flags
);
3991 ret
= btrfs_alloc_chunk(trans
, extent_root
, flags
);
3992 trans
->allocating_chunk
= false;
3994 spin_lock(&space_info
->lock
);
3995 if (ret
< 0 && ret
!= -ENOSPC
)
3998 space_info
->full
= 1;
4002 space_info
->force_alloc
= CHUNK_ALLOC_NO_FORCE
;
4004 space_info
->chunk_alloc
= 0;
4005 spin_unlock(&space_info
->lock
);
4006 mutex_unlock(&fs_info
->chunk_mutex
);
4010 static int can_overcommit(struct btrfs_root
*root
,
4011 struct btrfs_space_info
*space_info
, u64 bytes
,
4012 enum btrfs_reserve_flush_enum flush
)
4014 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
4015 u64 profile
= btrfs_get_alloc_profile(root
, 0);
4020 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4021 space_info
->bytes_pinned
+ space_info
->bytes_readonly
;
4024 * We only want to allow over committing if we have lots of actual space
4025 * free, but if we don't have enough space to handle the global reserve
4026 * space then we could end up having a real enospc problem when trying
4027 * to allocate a chunk or some other such important allocation.
4029 spin_lock(&global_rsv
->lock
);
4030 space_size
= calc_global_rsv_need_space(global_rsv
);
4031 spin_unlock(&global_rsv
->lock
);
4032 if (used
+ space_size
>= space_info
->total_bytes
)
4035 used
+= space_info
->bytes_may_use
;
4037 spin_lock(&root
->fs_info
->free_chunk_lock
);
4038 avail
= root
->fs_info
->free_chunk_space
;
4039 spin_unlock(&root
->fs_info
->free_chunk_lock
);
4042 * If we have dup, raid1 or raid10 then only half of the free
4043 * space is actually useable. For raid56, the space info used
4044 * doesn't include the parity drive, so we don't have to
4047 if (profile
& (BTRFS_BLOCK_GROUP_DUP
|
4048 BTRFS_BLOCK_GROUP_RAID1
|
4049 BTRFS_BLOCK_GROUP_RAID10
))
4053 * If we aren't flushing all things, let us overcommit up to
4054 * 1/2th of the space. If we can flush, don't let us overcommit
4055 * too much, let it overcommit up to 1/8 of the space.
4057 if (flush
== BTRFS_RESERVE_FLUSH_ALL
)
4062 if (used
+ bytes
< space_info
->total_bytes
+ avail
)
4067 static void btrfs_writeback_inodes_sb_nr(struct btrfs_root
*root
,
4068 unsigned long nr_pages
, int nr_items
)
4070 struct super_block
*sb
= root
->fs_info
->sb
;
4072 if (down_read_trylock(&sb
->s_umount
)) {
4073 writeback_inodes_sb_nr(sb
, nr_pages
, WB_REASON_FS_FREE_SPACE
);
4074 up_read(&sb
->s_umount
);
4077 * We needn't worry the filesystem going from r/w to r/o though
4078 * we don't acquire ->s_umount mutex, because the filesystem
4079 * should guarantee the delalloc inodes list be empty after
4080 * the filesystem is readonly(all dirty pages are written to
4083 btrfs_start_delalloc_roots(root
->fs_info
, 0, nr_items
);
4084 if (!current
->journal_info
)
4085 btrfs_wait_ordered_roots(root
->fs_info
, nr_items
);
4089 static inline int calc_reclaim_items_nr(struct btrfs_root
*root
, u64 to_reclaim
)
4094 bytes
= btrfs_calc_trans_metadata_size(root
, 1);
4095 nr
= (int)div64_u64(to_reclaim
, bytes
);
4101 #define EXTENT_SIZE_PER_ITEM (256 * 1024)
4104 * shrink metadata reservation for delalloc
4106 static void shrink_delalloc(struct btrfs_root
*root
, u64 to_reclaim
, u64 orig
,
4109 struct btrfs_block_rsv
*block_rsv
;
4110 struct btrfs_space_info
*space_info
;
4111 struct btrfs_trans_handle
*trans
;
4115 unsigned long nr_pages
;
4118 enum btrfs_reserve_flush_enum flush
;
4120 /* Calc the number of the pages we need flush for space reservation */
4121 items
= calc_reclaim_items_nr(root
, to_reclaim
);
4122 to_reclaim
= items
* EXTENT_SIZE_PER_ITEM
;
4124 trans
= (struct btrfs_trans_handle
*)current
->journal_info
;
4125 block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
4126 space_info
= block_rsv
->space_info
;
4128 delalloc_bytes
= percpu_counter_sum_positive(
4129 &root
->fs_info
->delalloc_bytes
);
4130 if (delalloc_bytes
== 0) {
4134 btrfs_wait_ordered_roots(root
->fs_info
, items
);
4139 while (delalloc_bytes
&& loops
< 3) {
4140 max_reclaim
= min(delalloc_bytes
, to_reclaim
);
4141 nr_pages
= max_reclaim
>> PAGE_CACHE_SHIFT
;
4142 btrfs_writeback_inodes_sb_nr(root
, nr_pages
, items
);
4144 * We need to wait for the async pages to actually start before
4147 max_reclaim
= atomic_read(&root
->fs_info
->async_delalloc_pages
);
4151 if (max_reclaim
<= nr_pages
)
4154 max_reclaim
-= nr_pages
;
4156 wait_event(root
->fs_info
->async_submit_wait
,
4157 atomic_read(&root
->fs_info
->async_delalloc_pages
) <=
4161 flush
= BTRFS_RESERVE_FLUSH_ALL
;
4163 flush
= BTRFS_RESERVE_NO_FLUSH
;
4164 spin_lock(&space_info
->lock
);
4165 if (can_overcommit(root
, space_info
, orig
, flush
)) {
4166 spin_unlock(&space_info
->lock
);
4169 spin_unlock(&space_info
->lock
);
4172 if (wait_ordered
&& !trans
) {
4173 btrfs_wait_ordered_roots(root
->fs_info
, items
);
4175 time_left
= schedule_timeout_killable(1);
4179 delalloc_bytes
= percpu_counter_sum_positive(
4180 &root
->fs_info
->delalloc_bytes
);
4185 * maybe_commit_transaction - possibly commit the transaction if its ok to
4186 * @root - the root we're allocating for
4187 * @bytes - the number of bytes we want to reserve
4188 * @force - force the commit
4190 * This will check to make sure that committing the transaction will actually
4191 * get us somewhere and then commit the transaction if it does. Otherwise it
4192 * will return -ENOSPC.
4194 static int may_commit_transaction(struct btrfs_root
*root
,
4195 struct btrfs_space_info
*space_info
,
4196 u64 bytes
, int force
)
4198 struct btrfs_block_rsv
*delayed_rsv
= &root
->fs_info
->delayed_block_rsv
;
4199 struct btrfs_trans_handle
*trans
;
4201 trans
= (struct btrfs_trans_handle
*)current
->journal_info
;
4208 /* See if there is enough pinned space to make this reservation */
4209 if (percpu_counter_compare(&space_info
->total_bytes_pinned
,
4214 * See if there is some space in the delayed insertion reservation for
4217 if (space_info
!= delayed_rsv
->space_info
)
4220 spin_lock(&delayed_rsv
->lock
);
4221 if (percpu_counter_compare(&space_info
->total_bytes_pinned
,
4222 bytes
- delayed_rsv
->size
) >= 0) {
4223 spin_unlock(&delayed_rsv
->lock
);
4226 spin_unlock(&delayed_rsv
->lock
);
4229 trans
= btrfs_join_transaction(root
);
4233 return btrfs_commit_transaction(trans
, root
);
4237 FLUSH_DELAYED_ITEMS_NR
= 1,
4238 FLUSH_DELAYED_ITEMS
= 2,
4240 FLUSH_DELALLOC_WAIT
= 4,
4245 static int flush_space(struct btrfs_root
*root
,
4246 struct btrfs_space_info
*space_info
, u64 num_bytes
,
4247 u64 orig_bytes
, int state
)
4249 struct btrfs_trans_handle
*trans
;
4254 case FLUSH_DELAYED_ITEMS_NR
:
4255 case FLUSH_DELAYED_ITEMS
:
4256 if (state
== FLUSH_DELAYED_ITEMS_NR
)
4257 nr
= calc_reclaim_items_nr(root
, num_bytes
) * 2;
4261 trans
= btrfs_join_transaction(root
);
4262 if (IS_ERR(trans
)) {
4263 ret
= PTR_ERR(trans
);
4266 ret
= btrfs_run_delayed_items_nr(trans
, root
, nr
);
4267 btrfs_end_transaction(trans
, root
);
4269 case FLUSH_DELALLOC
:
4270 case FLUSH_DELALLOC_WAIT
:
4271 shrink_delalloc(root
, num_bytes
* 2, orig_bytes
,
4272 state
== FLUSH_DELALLOC_WAIT
);
4275 trans
= btrfs_join_transaction(root
);
4276 if (IS_ERR(trans
)) {
4277 ret
= PTR_ERR(trans
);
4280 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
4281 btrfs_get_alloc_profile(root
, 0),
4282 CHUNK_ALLOC_NO_FORCE
);
4283 btrfs_end_transaction(trans
, root
);
4288 ret
= may_commit_transaction(root
, space_info
, orig_bytes
, 0);
4299 btrfs_calc_reclaim_metadata_size(struct btrfs_root
*root
,
4300 struct btrfs_space_info
*space_info
)
4306 to_reclaim
= min_t(u64
, num_online_cpus() * 1024 * 1024,
4308 spin_lock(&space_info
->lock
);
4309 if (can_overcommit(root
, space_info
, to_reclaim
,
4310 BTRFS_RESERVE_FLUSH_ALL
)) {
4315 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4316 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4317 space_info
->bytes_may_use
;
4318 if (can_overcommit(root
, space_info
, 1024 * 1024,
4319 BTRFS_RESERVE_FLUSH_ALL
))
4320 expected
= div_factor_fine(space_info
->total_bytes
, 95);
4322 expected
= div_factor_fine(space_info
->total_bytes
, 90);
4324 if (used
> expected
)
4325 to_reclaim
= used
- expected
;
4328 to_reclaim
= min(to_reclaim
, space_info
->bytes_may_use
+
4329 space_info
->bytes_reserved
);
4331 spin_unlock(&space_info
->lock
);
4336 static inline int need_do_async_reclaim(struct btrfs_space_info
*space_info
,
4337 struct btrfs_fs_info
*fs_info
, u64 used
)
4339 return (used
>= div_factor_fine(space_info
->total_bytes
, 98) &&
4340 !btrfs_fs_closing(fs_info
) &&
4341 !test_bit(BTRFS_FS_STATE_REMOUNTING
, &fs_info
->fs_state
));
4344 static int btrfs_need_do_async_reclaim(struct btrfs_space_info
*space_info
,
4345 struct btrfs_fs_info
*fs_info
,
4350 spin_lock(&space_info
->lock
);
4352 * We run out of space and have not got any free space via flush_space,
4353 * so don't bother doing async reclaim.
4355 if (flush_state
> COMMIT_TRANS
&& space_info
->full
) {
4356 spin_unlock(&space_info
->lock
);
4360 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4361 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4362 space_info
->bytes_may_use
;
4363 if (need_do_async_reclaim(space_info
, fs_info
, used
)) {
4364 spin_unlock(&space_info
->lock
);
4367 spin_unlock(&space_info
->lock
);
4372 static void btrfs_async_reclaim_metadata_space(struct work_struct
*work
)
4374 struct btrfs_fs_info
*fs_info
;
4375 struct btrfs_space_info
*space_info
;
4379 fs_info
= container_of(work
, struct btrfs_fs_info
, async_reclaim_work
);
4380 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4382 to_reclaim
= btrfs_calc_reclaim_metadata_size(fs_info
->fs_root
,
4387 flush_state
= FLUSH_DELAYED_ITEMS_NR
;
4389 flush_space(fs_info
->fs_root
, space_info
, to_reclaim
,
4390 to_reclaim
, flush_state
);
4392 if (!btrfs_need_do_async_reclaim(space_info
, fs_info
,
4395 } while (flush_state
<= COMMIT_TRANS
);
4397 if (btrfs_need_do_async_reclaim(space_info
, fs_info
, flush_state
))
4398 queue_work(system_unbound_wq
, work
);
4401 void btrfs_init_async_reclaim_work(struct work_struct
*work
)
4403 INIT_WORK(work
, btrfs_async_reclaim_metadata_space
);
4407 * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
4408 * @root - the root we're allocating for
4409 * @block_rsv - the block_rsv we're allocating for
4410 * @orig_bytes - the number of bytes we want
4411 * @flush - whether or not we can flush to make our reservation
4413 * This will reserve orgi_bytes number of bytes from the space info associated
4414 * with the block_rsv. If there is not enough space it will make an attempt to
4415 * flush out space to make room. It will do this by flushing delalloc if
4416 * possible or committing the transaction. If flush is 0 then no attempts to
4417 * regain reservations will be made and this will fail if there is not enough
4420 static int reserve_metadata_bytes(struct btrfs_root
*root
,
4421 struct btrfs_block_rsv
*block_rsv
,
4423 enum btrfs_reserve_flush_enum flush
)
4425 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
4427 u64 num_bytes
= orig_bytes
;
4428 int flush_state
= FLUSH_DELAYED_ITEMS_NR
;
4430 bool flushing
= false;
4434 spin_lock(&space_info
->lock
);
4436 * We only want to wait if somebody other than us is flushing and we
4437 * are actually allowed to flush all things.
4439 while (flush
== BTRFS_RESERVE_FLUSH_ALL
&& !flushing
&&
4440 space_info
->flush
) {
4441 spin_unlock(&space_info
->lock
);
4443 * If we have a trans handle we can't wait because the flusher
4444 * may have to commit the transaction, which would mean we would
4445 * deadlock since we are waiting for the flusher to finish, but
4446 * hold the current transaction open.
4448 if (current
->journal_info
)
4450 ret
= wait_event_killable(space_info
->wait
, !space_info
->flush
);
4451 /* Must have been killed, return */
4455 spin_lock(&space_info
->lock
);
4459 used
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
4460 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
4461 space_info
->bytes_may_use
;
4464 * The idea here is that we've not already over-reserved the block group
4465 * then we can go ahead and save our reservation first and then start
4466 * flushing if we need to. Otherwise if we've already overcommitted
4467 * lets start flushing stuff first and then come back and try to make
4470 if (used
<= space_info
->total_bytes
) {
4471 if (used
+ orig_bytes
<= space_info
->total_bytes
) {
4472 space_info
->bytes_may_use
+= orig_bytes
;
4473 trace_btrfs_space_reservation(root
->fs_info
,
4474 "space_info", space_info
->flags
, orig_bytes
, 1);
4478 * Ok set num_bytes to orig_bytes since we aren't
4479 * overocmmitted, this way we only try and reclaim what
4482 num_bytes
= orig_bytes
;
4486 * Ok we're over committed, set num_bytes to the overcommitted
4487 * amount plus the amount of bytes that we need for this
4490 num_bytes
= used
- space_info
->total_bytes
+
4494 if (ret
&& can_overcommit(root
, space_info
, orig_bytes
, flush
)) {
4495 space_info
->bytes_may_use
+= orig_bytes
;
4496 trace_btrfs_space_reservation(root
->fs_info
, "space_info",
4497 space_info
->flags
, orig_bytes
,
4503 * Couldn't make our reservation, save our place so while we're trying
4504 * to reclaim space we can actually use it instead of somebody else
4505 * stealing it from us.
4507 * We make the other tasks wait for the flush only when we can flush
4510 if (ret
&& flush
!= BTRFS_RESERVE_NO_FLUSH
) {
4512 space_info
->flush
= 1;
4513 } else if (!ret
&& space_info
->flags
& BTRFS_BLOCK_GROUP_METADATA
) {
4516 * We will do the space reservation dance during log replay,
4517 * which means we won't have fs_info->fs_root set, so don't do
4518 * the async reclaim as we will panic.
4520 if (!root
->fs_info
->log_root_recovering
&&
4521 need_do_async_reclaim(space_info
, root
->fs_info
, used
) &&
4522 !work_busy(&root
->fs_info
->async_reclaim_work
))
4523 queue_work(system_unbound_wq
,
4524 &root
->fs_info
->async_reclaim_work
);
4526 spin_unlock(&space_info
->lock
);
4528 if (!ret
|| flush
== BTRFS_RESERVE_NO_FLUSH
)
4531 ret
= flush_space(root
, space_info
, num_bytes
, orig_bytes
,
4536 * If we are FLUSH_LIMIT, we can not flush delalloc, or the deadlock
4537 * would happen. So skip delalloc flush.
4539 if (flush
== BTRFS_RESERVE_FLUSH_LIMIT
&&
4540 (flush_state
== FLUSH_DELALLOC
||
4541 flush_state
== FLUSH_DELALLOC_WAIT
))
4542 flush_state
= ALLOC_CHUNK
;
4546 else if (flush
== BTRFS_RESERVE_FLUSH_LIMIT
&&
4547 flush_state
< COMMIT_TRANS
)
4549 else if (flush
== BTRFS_RESERVE_FLUSH_ALL
&&
4550 flush_state
<= COMMIT_TRANS
)
4554 if (ret
== -ENOSPC
&&
4555 unlikely(root
->orphan_cleanup_state
== ORPHAN_CLEANUP_STARTED
)) {
4556 struct btrfs_block_rsv
*global_rsv
=
4557 &root
->fs_info
->global_block_rsv
;
4559 if (block_rsv
!= global_rsv
&&
4560 !block_rsv_use_bytes(global_rsv
, orig_bytes
))
4564 trace_btrfs_space_reservation(root
->fs_info
,
4565 "space_info:enospc",
4566 space_info
->flags
, orig_bytes
, 1);
4568 spin_lock(&space_info
->lock
);
4569 space_info
->flush
= 0;
4570 wake_up_all(&space_info
->wait
);
4571 spin_unlock(&space_info
->lock
);
4576 static struct btrfs_block_rsv
*get_block_rsv(
4577 const struct btrfs_trans_handle
*trans
,
4578 const struct btrfs_root
*root
)
4580 struct btrfs_block_rsv
*block_rsv
= NULL
;
4582 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
4583 block_rsv
= trans
->block_rsv
;
4585 if (root
== root
->fs_info
->csum_root
&& trans
->adding_csums
)
4586 block_rsv
= trans
->block_rsv
;
4588 if (root
== root
->fs_info
->uuid_root
)
4589 block_rsv
= trans
->block_rsv
;
4592 block_rsv
= root
->block_rsv
;
4595 block_rsv
= &root
->fs_info
->empty_block_rsv
;
4600 static int block_rsv_use_bytes(struct btrfs_block_rsv
*block_rsv
,
4604 spin_lock(&block_rsv
->lock
);
4605 if (block_rsv
->reserved
>= num_bytes
) {
4606 block_rsv
->reserved
-= num_bytes
;
4607 if (block_rsv
->reserved
< block_rsv
->size
)
4608 block_rsv
->full
= 0;
4611 spin_unlock(&block_rsv
->lock
);
4615 static void block_rsv_add_bytes(struct btrfs_block_rsv
*block_rsv
,
4616 u64 num_bytes
, int update_size
)
4618 spin_lock(&block_rsv
->lock
);
4619 block_rsv
->reserved
+= num_bytes
;
4621 block_rsv
->size
+= num_bytes
;
4622 else if (block_rsv
->reserved
>= block_rsv
->size
)
4623 block_rsv
->full
= 1;
4624 spin_unlock(&block_rsv
->lock
);
4627 int btrfs_cond_migrate_bytes(struct btrfs_fs_info
*fs_info
,
4628 struct btrfs_block_rsv
*dest
, u64 num_bytes
,
4631 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
4634 if (global_rsv
->space_info
!= dest
->space_info
)
4637 spin_lock(&global_rsv
->lock
);
4638 min_bytes
= div_factor(global_rsv
->size
, min_factor
);
4639 if (global_rsv
->reserved
< min_bytes
+ num_bytes
) {
4640 spin_unlock(&global_rsv
->lock
);
4643 global_rsv
->reserved
-= num_bytes
;
4644 if (global_rsv
->reserved
< global_rsv
->size
)
4645 global_rsv
->full
= 0;
4646 spin_unlock(&global_rsv
->lock
);
4648 block_rsv_add_bytes(dest
, num_bytes
, 1);
4652 static void block_rsv_release_bytes(struct btrfs_fs_info
*fs_info
,
4653 struct btrfs_block_rsv
*block_rsv
,
4654 struct btrfs_block_rsv
*dest
, u64 num_bytes
)
4656 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
4658 spin_lock(&block_rsv
->lock
);
4659 if (num_bytes
== (u64
)-1)
4660 num_bytes
= block_rsv
->size
;
4661 block_rsv
->size
-= num_bytes
;
4662 if (block_rsv
->reserved
>= block_rsv
->size
) {
4663 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
4664 block_rsv
->reserved
= block_rsv
->size
;
4665 block_rsv
->full
= 1;
4669 spin_unlock(&block_rsv
->lock
);
4671 if (num_bytes
> 0) {
4673 spin_lock(&dest
->lock
);
4677 bytes_to_add
= dest
->size
- dest
->reserved
;
4678 bytes_to_add
= min(num_bytes
, bytes_to_add
);
4679 dest
->reserved
+= bytes_to_add
;
4680 if (dest
->reserved
>= dest
->size
)
4682 num_bytes
-= bytes_to_add
;
4684 spin_unlock(&dest
->lock
);
4687 spin_lock(&space_info
->lock
);
4688 space_info
->bytes_may_use
-= num_bytes
;
4689 trace_btrfs_space_reservation(fs_info
, "space_info",
4690 space_info
->flags
, num_bytes
, 0);
4691 spin_unlock(&space_info
->lock
);
4696 static int block_rsv_migrate_bytes(struct btrfs_block_rsv
*src
,
4697 struct btrfs_block_rsv
*dst
, u64 num_bytes
)
4701 ret
= block_rsv_use_bytes(src
, num_bytes
);
4705 block_rsv_add_bytes(dst
, num_bytes
, 1);
4709 void btrfs_init_block_rsv(struct btrfs_block_rsv
*rsv
, unsigned short type
)
4711 memset(rsv
, 0, sizeof(*rsv
));
4712 spin_lock_init(&rsv
->lock
);
4716 struct btrfs_block_rsv
*btrfs_alloc_block_rsv(struct btrfs_root
*root
,
4717 unsigned short type
)
4719 struct btrfs_block_rsv
*block_rsv
;
4720 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4722 block_rsv
= kmalloc(sizeof(*block_rsv
), GFP_NOFS
);
4726 btrfs_init_block_rsv(block_rsv
, type
);
4727 block_rsv
->space_info
= __find_space_info(fs_info
,
4728 BTRFS_BLOCK_GROUP_METADATA
);
4732 void btrfs_free_block_rsv(struct btrfs_root
*root
,
4733 struct btrfs_block_rsv
*rsv
)
4737 btrfs_block_rsv_release(root
, rsv
, (u64
)-1);
4741 int btrfs_block_rsv_add(struct btrfs_root
*root
,
4742 struct btrfs_block_rsv
*block_rsv
, u64 num_bytes
,
4743 enum btrfs_reserve_flush_enum flush
)
4750 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
4752 block_rsv_add_bytes(block_rsv
, num_bytes
, 1);
4759 int btrfs_block_rsv_check(struct btrfs_root
*root
,
4760 struct btrfs_block_rsv
*block_rsv
, int min_factor
)
4768 spin_lock(&block_rsv
->lock
);
4769 num_bytes
= div_factor(block_rsv
->size
, min_factor
);
4770 if (block_rsv
->reserved
>= num_bytes
)
4772 spin_unlock(&block_rsv
->lock
);
4777 int btrfs_block_rsv_refill(struct btrfs_root
*root
,
4778 struct btrfs_block_rsv
*block_rsv
, u64 min_reserved
,
4779 enum btrfs_reserve_flush_enum flush
)
4787 spin_lock(&block_rsv
->lock
);
4788 num_bytes
= min_reserved
;
4789 if (block_rsv
->reserved
>= num_bytes
)
4792 num_bytes
-= block_rsv
->reserved
;
4793 spin_unlock(&block_rsv
->lock
);
4798 ret
= reserve_metadata_bytes(root
, block_rsv
, num_bytes
, flush
);
4800 block_rsv_add_bytes(block_rsv
, num_bytes
, 0);
4807 int btrfs_block_rsv_migrate(struct btrfs_block_rsv
*src_rsv
,
4808 struct btrfs_block_rsv
*dst_rsv
,
4811 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
4814 void btrfs_block_rsv_release(struct btrfs_root
*root
,
4815 struct btrfs_block_rsv
*block_rsv
,
4818 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
4819 if (global_rsv
== block_rsv
||
4820 block_rsv
->space_info
!= global_rsv
->space_info
)
4822 block_rsv_release_bytes(root
->fs_info
, block_rsv
, global_rsv
,
4827 * helper to calculate size of global block reservation.
4828 * the desired value is sum of space used by extent tree,
4829 * checksum tree and root tree
4831 static u64
calc_global_metadata_size(struct btrfs_fs_info
*fs_info
)
4833 struct btrfs_space_info
*sinfo
;
4837 int csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
4839 sinfo
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_DATA
);
4840 spin_lock(&sinfo
->lock
);
4841 data_used
= sinfo
->bytes_used
;
4842 spin_unlock(&sinfo
->lock
);
4844 sinfo
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4845 spin_lock(&sinfo
->lock
);
4846 if (sinfo
->flags
& BTRFS_BLOCK_GROUP_DATA
)
4848 meta_used
= sinfo
->bytes_used
;
4849 spin_unlock(&sinfo
->lock
);
4851 num_bytes
= (data_used
>> fs_info
->sb
->s_blocksize_bits
) *
4853 num_bytes
+= div64_u64(data_used
+ meta_used
, 50);
4855 if (num_bytes
* 3 > meta_used
)
4856 num_bytes
= div64_u64(meta_used
, 3);
4858 return ALIGN(num_bytes
, fs_info
->extent_root
->nodesize
<< 10);
4861 static void update_global_block_rsv(struct btrfs_fs_info
*fs_info
)
4863 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
4864 struct btrfs_space_info
*sinfo
= block_rsv
->space_info
;
4867 num_bytes
= calc_global_metadata_size(fs_info
);
4869 spin_lock(&sinfo
->lock
);
4870 spin_lock(&block_rsv
->lock
);
4872 block_rsv
->size
= min_t(u64
, num_bytes
, 512 * 1024 * 1024);
4874 num_bytes
= sinfo
->bytes_used
+ sinfo
->bytes_pinned
+
4875 sinfo
->bytes_reserved
+ sinfo
->bytes_readonly
+
4876 sinfo
->bytes_may_use
;
4878 if (sinfo
->total_bytes
> num_bytes
) {
4879 num_bytes
= sinfo
->total_bytes
- num_bytes
;
4880 block_rsv
->reserved
+= num_bytes
;
4881 sinfo
->bytes_may_use
+= num_bytes
;
4882 trace_btrfs_space_reservation(fs_info
, "space_info",
4883 sinfo
->flags
, num_bytes
, 1);
4886 if (block_rsv
->reserved
>= block_rsv
->size
) {
4887 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
4888 sinfo
->bytes_may_use
-= num_bytes
;
4889 trace_btrfs_space_reservation(fs_info
, "space_info",
4890 sinfo
->flags
, num_bytes
, 0);
4891 block_rsv
->reserved
= block_rsv
->size
;
4892 block_rsv
->full
= 1;
4895 spin_unlock(&block_rsv
->lock
);
4896 spin_unlock(&sinfo
->lock
);
4899 static void init_global_block_rsv(struct btrfs_fs_info
*fs_info
)
4901 struct btrfs_space_info
*space_info
;
4903 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
4904 fs_info
->chunk_block_rsv
.space_info
= space_info
;
4906 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
4907 fs_info
->global_block_rsv
.space_info
= space_info
;
4908 fs_info
->delalloc_block_rsv
.space_info
= space_info
;
4909 fs_info
->trans_block_rsv
.space_info
= space_info
;
4910 fs_info
->empty_block_rsv
.space_info
= space_info
;
4911 fs_info
->delayed_block_rsv
.space_info
= space_info
;
4913 fs_info
->extent_root
->block_rsv
= &fs_info
->global_block_rsv
;
4914 fs_info
->csum_root
->block_rsv
= &fs_info
->global_block_rsv
;
4915 fs_info
->dev_root
->block_rsv
= &fs_info
->global_block_rsv
;
4916 fs_info
->tree_root
->block_rsv
= &fs_info
->global_block_rsv
;
4917 if (fs_info
->quota_root
)
4918 fs_info
->quota_root
->block_rsv
= &fs_info
->global_block_rsv
;
4919 fs_info
->chunk_root
->block_rsv
= &fs_info
->chunk_block_rsv
;
4921 update_global_block_rsv(fs_info
);
4924 static void release_global_block_rsv(struct btrfs_fs_info
*fs_info
)
4926 block_rsv_release_bytes(fs_info
, &fs_info
->global_block_rsv
, NULL
,
4928 WARN_ON(fs_info
->delalloc_block_rsv
.size
> 0);
4929 WARN_ON(fs_info
->delalloc_block_rsv
.reserved
> 0);
4930 WARN_ON(fs_info
->trans_block_rsv
.size
> 0);
4931 WARN_ON(fs_info
->trans_block_rsv
.reserved
> 0);
4932 WARN_ON(fs_info
->chunk_block_rsv
.size
> 0);
4933 WARN_ON(fs_info
->chunk_block_rsv
.reserved
> 0);
4934 WARN_ON(fs_info
->delayed_block_rsv
.size
> 0);
4935 WARN_ON(fs_info
->delayed_block_rsv
.reserved
> 0);
4938 void btrfs_trans_release_metadata(struct btrfs_trans_handle
*trans
,
4939 struct btrfs_root
*root
)
4941 if (!trans
->block_rsv
)
4944 if (!trans
->bytes_reserved
)
4947 trace_btrfs_space_reservation(root
->fs_info
, "transaction",
4948 trans
->transid
, trans
->bytes_reserved
, 0);
4949 btrfs_block_rsv_release(root
, trans
->block_rsv
, trans
->bytes_reserved
);
4950 trans
->bytes_reserved
= 0;
4953 /* Can only return 0 or -ENOSPC */
4954 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle
*trans
,
4955 struct inode
*inode
)
4957 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4958 struct btrfs_block_rsv
*src_rsv
= get_block_rsv(trans
, root
);
4959 struct btrfs_block_rsv
*dst_rsv
= root
->orphan_block_rsv
;
4962 * We need to hold space in order to delete our orphan item once we've
4963 * added it, so this takes the reservation so we can release it later
4964 * when we are truly done with the orphan item.
4966 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
4967 trace_btrfs_space_reservation(root
->fs_info
, "orphan",
4968 btrfs_ino(inode
), num_bytes
, 1);
4969 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
4972 void btrfs_orphan_release_metadata(struct inode
*inode
)
4974 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4975 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 1);
4976 trace_btrfs_space_reservation(root
->fs_info
, "orphan",
4977 btrfs_ino(inode
), num_bytes
, 0);
4978 btrfs_block_rsv_release(root
, root
->orphan_block_rsv
, num_bytes
);
4982 * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation
4983 * root: the root of the parent directory
4984 * rsv: block reservation
4985 * items: the number of items that we need do reservation
4986 * qgroup_reserved: used to return the reserved size in qgroup
4988 * This function is used to reserve the space for snapshot/subvolume
4989 * creation and deletion. Those operations are different with the
4990 * common file/directory operations, they change two fs/file trees
4991 * and root tree, the number of items that the qgroup reserves is
4992 * different with the free space reservation. So we can not use
4993 * the space reseravtion mechanism in start_transaction().
4995 int btrfs_subvolume_reserve_metadata(struct btrfs_root
*root
,
4996 struct btrfs_block_rsv
*rsv
,
4998 u64
*qgroup_reserved
,
4999 bool use_global_rsv
)
5003 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
5005 if (root
->fs_info
->quota_enabled
) {
5006 /* One for parent inode, two for dir entries */
5007 num_bytes
= 3 * root
->nodesize
;
5008 ret
= btrfs_qgroup_reserve(root
, num_bytes
);
5015 *qgroup_reserved
= num_bytes
;
5017 num_bytes
= btrfs_calc_trans_metadata_size(root
, items
);
5018 rsv
->space_info
= __find_space_info(root
->fs_info
,
5019 BTRFS_BLOCK_GROUP_METADATA
);
5020 ret
= btrfs_block_rsv_add(root
, rsv
, num_bytes
,
5021 BTRFS_RESERVE_FLUSH_ALL
);
5023 if (ret
== -ENOSPC
&& use_global_rsv
)
5024 ret
= btrfs_block_rsv_migrate(global_rsv
, rsv
, num_bytes
);
5027 if (*qgroup_reserved
)
5028 btrfs_qgroup_free(root
, *qgroup_reserved
);
5034 void btrfs_subvolume_release_metadata(struct btrfs_root
*root
,
5035 struct btrfs_block_rsv
*rsv
,
5036 u64 qgroup_reserved
)
5038 btrfs_block_rsv_release(root
, rsv
, (u64
)-1);
5039 if (qgroup_reserved
)
5040 btrfs_qgroup_free(root
, qgroup_reserved
);
5044 * drop_outstanding_extent - drop an outstanding extent
5045 * @inode: the inode we're dropping the extent for
5047 * This is called when we are freeing up an outstanding extent, either called
5048 * after an error or after an extent is written. This will return the number of
5049 * reserved extents that need to be freed. This must be called with
5050 * BTRFS_I(inode)->lock held.
5052 static unsigned drop_outstanding_extent(struct inode
*inode
)
5054 unsigned drop_inode_space
= 0;
5055 unsigned dropped_extents
= 0;
5057 BUG_ON(!BTRFS_I(inode
)->outstanding_extents
);
5058 BTRFS_I(inode
)->outstanding_extents
--;
5060 if (BTRFS_I(inode
)->outstanding_extents
== 0 &&
5061 test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5062 &BTRFS_I(inode
)->runtime_flags
))
5063 drop_inode_space
= 1;
5066 * If we have more or the same amount of outsanding extents than we have
5067 * reserved then we need to leave the reserved extents count alone.
5069 if (BTRFS_I(inode
)->outstanding_extents
>=
5070 BTRFS_I(inode
)->reserved_extents
)
5071 return drop_inode_space
;
5073 dropped_extents
= BTRFS_I(inode
)->reserved_extents
-
5074 BTRFS_I(inode
)->outstanding_extents
;
5075 BTRFS_I(inode
)->reserved_extents
-= dropped_extents
;
5076 return dropped_extents
+ drop_inode_space
;
5080 * calc_csum_metadata_size - return the amount of metada space that must be
5081 * reserved/free'd for the given bytes.
5082 * @inode: the inode we're manipulating
5083 * @num_bytes: the number of bytes in question
5084 * @reserve: 1 if we are reserving space, 0 if we are freeing space
5086 * This adjusts the number of csum_bytes in the inode and then returns the
5087 * correct amount of metadata that must either be reserved or freed. We
5088 * calculate how many checksums we can fit into one leaf and then divide the
5089 * number of bytes that will need to be checksumed by this value to figure out
5090 * how many checksums will be required. If we are adding bytes then the number
5091 * may go up and we will return the number of additional bytes that must be
5092 * reserved. If it is going down we will return the number of bytes that must
5095 * This must be called with BTRFS_I(inode)->lock held.
5097 static u64
calc_csum_metadata_size(struct inode
*inode
, u64 num_bytes
,
5100 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5102 int num_csums_per_leaf
;
5106 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
&&
5107 BTRFS_I(inode
)->csum_bytes
== 0)
5110 old_csums
= (int)div64_u64(BTRFS_I(inode
)->csum_bytes
, root
->sectorsize
);
5112 BTRFS_I(inode
)->csum_bytes
+= num_bytes
;
5114 BTRFS_I(inode
)->csum_bytes
-= num_bytes
;
5115 csum_size
= BTRFS_LEAF_DATA_SIZE(root
) - sizeof(struct btrfs_item
);
5116 num_csums_per_leaf
= (int)div64_u64(csum_size
,
5117 sizeof(struct btrfs_csum_item
) +
5118 sizeof(struct btrfs_disk_key
));
5119 num_csums
= (int)div64_u64(BTRFS_I(inode
)->csum_bytes
, root
->sectorsize
);
5120 num_csums
= num_csums
+ num_csums_per_leaf
- 1;
5121 num_csums
= num_csums
/ num_csums_per_leaf
;
5123 old_csums
= old_csums
+ num_csums_per_leaf
- 1;
5124 old_csums
= old_csums
/ num_csums_per_leaf
;
5126 /* No change, no need to reserve more */
5127 if (old_csums
== num_csums
)
5131 return btrfs_calc_trans_metadata_size(root
,
5132 num_csums
- old_csums
);
5134 return btrfs_calc_trans_metadata_size(root
, old_csums
- num_csums
);
5137 int btrfs_delalloc_reserve_metadata(struct inode
*inode
, u64 num_bytes
)
5139 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5140 struct btrfs_block_rsv
*block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
5143 unsigned nr_extents
= 0;
5144 int extra_reserve
= 0;
5145 enum btrfs_reserve_flush_enum flush
= BTRFS_RESERVE_FLUSH_ALL
;
5147 bool delalloc_lock
= true;
5151 /* If we are a free space inode we need to not flush since we will be in
5152 * the middle of a transaction commit. We also don't need the delalloc
5153 * mutex since we won't race with anybody. We need this mostly to make
5154 * lockdep shut its filthy mouth.
5156 if (btrfs_is_free_space_inode(inode
)) {
5157 flush
= BTRFS_RESERVE_NO_FLUSH
;
5158 delalloc_lock
= false;
5161 if (flush
!= BTRFS_RESERVE_NO_FLUSH
&&
5162 btrfs_transaction_in_commit(root
->fs_info
))
5163 schedule_timeout(1);
5166 mutex_lock(&BTRFS_I(inode
)->delalloc_mutex
);
5168 num_bytes
= ALIGN(num_bytes
, root
->sectorsize
);
5170 spin_lock(&BTRFS_I(inode
)->lock
);
5171 BTRFS_I(inode
)->outstanding_extents
++;
5173 if (BTRFS_I(inode
)->outstanding_extents
>
5174 BTRFS_I(inode
)->reserved_extents
)
5175 nr_extents
= BTRFS_I(inode
)->outstanding_extents
-
5176 BTRFS_I(inode
)->reserved_extents
;
5179 * Add an item to reserve for updating the inode when we complete the
5182 if (!test_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5183 &BTRFS_I(inode
)->runtime_flags
)) {
5188 to_reserve
= btrfs_calc_trans_metadata_size(root
, nr_extents
);
5189 to_reserve
+= calc_csum_metadata_size(inode
, num_bytes
, 1);
5190 csum_bytes
= BTRFS_I(inode
)->csum_bytes
;
5191 spin_unlock(&BTRFS_I(inode
)->lock
);
5193 if (root
->fs_info
->quota_enabled
) {
5194 ret
= btrfs_qgroup_reserve(root
, num_bytes
+
5195 nr_extents
* root
->nodesize
);
5200 ret
= reserve_metadata_bytes(root
, block_rsv
, to_reserve
, flush
);
5201 if (unlikely(ret
)) {
5202 if (root
->fs_info
->quota_enabled
)
5203 btrfs_qgroup_free(root
, num_bytes
+
5204 nr_extents
* root
->nodesize
);
5208 spin_lock(&BTRFS_I(inode
)->lock
);
5209 if (extra_reserve
) {
5210 set_bit(BTRFS_INODE_DELALLOC_META_RESERVED
,
5211 &BTRFS_I(inode
)->runtime_flags
);
5214 BTRFS_I(inode
)->reserved_extents
+= nr_extents
;
5215 spin_unlock(&BTRFS_I(inode
)->lock
);
5218 mutex_unlock(&BTRFS_I(inode
)->delalloc_mutex
);
5221 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5222 btrfs_ino(inode
), to_reserve
, 1);
5223 block_rsv_add_bytes(block_rsv
, to_reserve
, 1);
5228 spin_lock(&BTRFS_I(inode
)->lock
);
5229 dropped
= drop_outstanding_extent(inode
);
5231 * If the inodes csum_bytes is the same as the original
5232 * csum_bytes then we know we haven't raced with any free()ers
5233 * so we can just reduce our inodes csum bytes and carry on.
5235 if (BTRFS_I(inode
)->csum_bytes
== csum_bytes
) {
5236 calc_csum_metadata_size(inode
, num_bytes
, 0);
5238 u64 orig_csum_bytes
= BTRFS_I(inode
)->csum_bytes
;
5242 * This is tricky, but first we need to figure out how much we
5243 * free'd from any free-ers that occured during this
5244 * reservation, so we reset ->csum_bytes to the csum_bytes
5245 * before we dropped our lock, and then call the free for the
5246 * number of bytes that were freed while we were trying our
5249 bytes
= csum_bytes
- BTRFS_I(inode
)->csum_bytes
;
5250 BTRFS_I(inode
)->csum_bytes
= csum_bytes
;
5251 to_free
= calc_csum_metadata_size(inode
, bytes
, 0);
5255 * Now we need to see how much we would have freed had we not
5256 * been making this reservation and our ->csum_bytes were not
5257 * artificially inflated.
5259 BTRFS_I(inode
)->csum_bytes
= csum_bytes
- num_bytes
;
5260 bytes
= csum_bytes
- orig_csum_bytes
;
5261 bytes
= calc_csum_metadata_size(inode
, bytes
, 0);
5264 * Now reset ->csum_bytes to what it should be. If bytes is
5265 * more than to_free then we would have free'd more space had we
5266 * not had an artificially high ->csum_bytes, so we need to free
5267 * the remainder. If bytes is the same or less then we don't
5268 * need to do anything, the other free-ers did the correct
5271 BTRFS_I(inode
)->csum_bytes
= orig_csum_bytes
- num_bytes
;
5272 if (bytes
> to_free
)
5273 to_free
= bytes
- to_free
;
5277 spin_unlock(&BTRFS_I(inode
)->lock
);
5279 to_free
+= btrfs_calc_trans_metadata_size(root
, dropped
);
5282 btrfs_block_rsv_release(root
, block_rsv
, to_free
);
5283 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5284 btrfs_ino(inode
), to_free
, 0);
5287 mutex_unlock(&BTRFS_I(inode
)->delalloc_mutex
);
5292 * btrfs_delalloc_release_metadata - release a metadata reservation for an inode
5293 * @inode: the inode to release the reservation for
5294 * @num_bytes: the number of bytes we're releasing
5296 * This will release the metadata reservation for an inode. This can be called
5297 * once we complete IO for a given set of bytes to release their metadata
5300 void btrfs_delalloc_release_metadata(struct inode
*inode
, u64 num_bytes
)
5302 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5306 num_bytes
= ALIGN(num_bytes
, root
->sectorsize
);
5307 spin_lock(&BTRFS_I(inode
)->lock
);
5308 dropped
= drop_outstanding_extent(inode
);
5311 to_free
= calc_csum_metadata_size(inode
, num_bytes
, 0);
5312 spin_unlock(&BTRFS_I(inode
)->lock
);
5314 to_free
+= btrfs_calc_trans_metadata_size(root
, dropped
);
5316 trace_btrfs_space_reservation(root
->fs_info
, "delalloc",
5317 btrfs_ino(inode
), to_free
, 0);
5318 if (root
->fs_info
->quota_enabled
) {
5319 btrfs_qgroup_free(root
, num_bytes
+
5320 dropped
* root
->nodesize
);
5323 btrfs_block_rsv_release(root
, &root
->fs_info
->delalloc_block_rsv
,
5328 * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc
5329 * @inode: inode we're writing to
5330 * @num_bytes: the number of bytes we want to allocate
5332 * This will do the following things
5334 * o reserve space in the data space info for num_bytes
5335 * o reserve space in the metadata space info based on number of outstanding
5336 * extents and how much csums will be needed
5337 * o add to the inodes ->delalloc_bytes
5338 * o add it to the fs_info's delalloc inodes list.
5340 * This will return 0 for success and -ENOSPC if there is no space left.
5342 int btrfs_delalloc_reserve_space(struct inode
*inode
, u64 num_bytes
)
5346 ret
= btrfs_check_data_free_space(inode
, num_bytes
);
5350 ret
= btrfs_delalloc_reserve_metadata(inode
, num_bytes
);
5352 btrfs_free_reserved_data_space(inode
, num_bytes
);
5360 * btrfs_delalloc_release_space - release data and metadata space for delalloc
5361 * @inode: inode we're releasing space for
5362 * @num_bytes: the number of bytes we want to free up
5364 * This must be matched with a call to btrfs_delalloc_reserve_space. This is
5365 * called in the case that we don't need the metadata AND data reservations
5366 * anymore. So if there is an error or we insert an inline extent.
5368 * This function will release the metadata space that was not used and will
5369 * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes
5370 * list if there are no delalloc bytes left.
5372 void btrfs_delalloc_release_space(struct inode
*inode
, u64 num_bytes
)
5374 btrfs_delalloc_release_metadata(inode
, num_bytes
);
5375 btrfs_free_reserved_data_space(inode
, num_bytes
);
5378 static int update_block_group(struct btrfs_root
*root
,
5379 u64 bytenr
, u64 num_bytes
, int alloc
)
5381 struct btrfs_block_group_cache
*cache
= NULL
;
5382 struct btrfs_fs_info
*info
= root
->fs_info
;
5383 u64 total
= num_bytes
;
5388 /* block accounting for super block */
5389 spin_lock(&info
->delalloc_root_lock
);
5390 old_val
= btrfs_super_bytes_used(info
->super_copy
);
5392 old_val
+= num_bytes
;
5394 old_val
-= num_bytes
;
5395 btrfs_set_super_bytes_used(info
->super_copy
, old_val
);
5396 spin_unlock(&info
->delalloc_root_lock
);
5399 cache
= btrfs_lookup_block_group(info
, bytenr
);
5402 if (cache
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
5403 BTRFS_BLOCK_GROUP_RAID1
|
5404 BTRFS_BLOCK_GROUP_RAID10
))
5409 * If this block group has free space cache written out, we
5410 * need to make sure to load it if we are removing space. This
5411 * is because we need the unpinning stage to actually add the
5412 * space back to the block group, otherwise we will leak space.
5414 if (!alloc
&& cache
->cached
== BTRFS_CACHE_NO
)
5415 cache_block_group(cache
, 1);
5417 byte_in_group
= bytenr
- cache
->key
.objectid
;
5418 WARN_ON(byte_in_group
> cache
->key
.offset
);
5420 spin_lock(&cache
->space_info
->lock
);
5421 spin_lock(&cache
->lock
);
5423 if (btrfs_test_opt(root
, SPACE_CACHE
) &&
5424 cache
->disk_cache_state
< BTRFS_DC_CLEAR
)
5425 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
5428 old_val
= btrfs_block_group_used(&cache
->item
);
5429 num_bytes
= min(total
, cache
->key
.offset
- byte_in_group
);
5431 old_val
+= num_bytes
;
5432 btrfs_set_block_group_used(&cache
->item
, old_val
);
5433 cache
->reserved
-= num_bytes
;
5434 cache
->space_info
->bytes_reserved
-= num_bytes
;
5435 cache
->space_info
->bytes_used
+= num_bytes
;
5436 cache
->space_info
->disk_used
+= num_bytes
* factor
;
5437 spin_unlock(&cache
->lock
);
5438 spin_unlock(&cache
->space_info
->lock
);
5440 old_val
-= num_bytes
;
5441 btrfs_set_block_group_used(&cache
->item
, old_val
);
5442 cache
->pinned
+= num_bytes
;
5443 cache
->space_info
->bytes_pinned
+= num_bytes
;
5444 cache
->space_info
->bytes_used
-= num_bytes
;
5445 cache
->space_info
->disk_used
-= num_bytes
* factor
;
5446 spin_unlock(&cache
->lock
);
5447 spin_unlock(&cache
->space_info
->lock
);
5449 set_extent_dirty(info
->pinned_extents
,
5450 bytenr
, bytenr
+ num_bytes
- 1,
5451 GFP_NOFS
| __GFP_NOFAIL
);
5453 * No longer have used bytes in this block group, queue
5457 spin_lock(&info
->unused_bgs_lock
);
5458 if (list_empty(&cache
->bg_list
)) {
5459 btrfs_get_block_group(cache
);
5460 list_add_tail(&cache
->bg_list
,
5463 spin_unlock(&info
->unused_bgs_lock
);
5466 btrfs_put_block_group(cache
);
5468 bytenr
+= num_bytes
;
5473 static u64
first_logical_byte(struct btrfs_root
*root
, u64 search_start
)
5475 struct btrfs_block_group_cache
*cache
;
5478 spin_lock(&root
->fs_info
->block_group_cache_lock
);
5479 bytenr
= root
->fs_info
->first_logical_byte
;
5480 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
5482 if (bytenr
< (u64
)-1)
5485 cache
= btrfs_lookup_first_block_group(root
->fs_info
, search_start
);
5489 bytenr
= cache
->key
.objectid
;
5490 btrfs_put_block_group(cache
);
5495 static int pin_down_extent(struct btrfs_root
*root
,
5496 struct btrfs_block_group_cache
*cache
,
5497 u64 bytenr
, u64 num_bytes
, int reserved
)
5499 spin_lock(&cache
->space_info
->lock
);
5500 spin_lock(&cache
->lock
);
5501 cache
->pinned
+= num_bytes
;
5502 cache
->space_info
->bytes_pinned
+= num_bytes
;
5504 cache
->reserved
-= num_bytes
;
5505 cache
->space_info
->bytes_reserved
-= num_bytes
;
5507 spin_unlock(&cache
->lock
);
5508 spin_unlock(&cache
->space_info
->lock
);
5510 set_extent_dirty(root
->fs_info
->pinned_extents
, bytenr
,
5511 bytenr
+ num_bytes
- 1, GFP_NOFS
| __GFP_NOFAIL
);
5513 trace_btrfs_reserved_extent_free(root
, bytenr
, num_bytes
);
5518 * this function must be called within transaction
5520 int btrfs_pin_extent(struct btrfs_root
*root
,
5521 u64 bytenr
, u64 num_bytes
, int reserved
)
5523 struct btrfs_block_group_cache
*cache
;
5525 cache
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
5526 BUG_ON(!cache
); /* Logic error */
5528 pin_down_extent(root
, cache
, bytenr
, num_bytes
, reserved
);
5530 btrfs_put_block_group(cache
);
5535 * this function must be called within transaction
5537 int btrfs_pin_extent_for_log_replay(struct btrfs_root
*root
,
5538 u64 bytenr
, u64 num_bytes
)
5540 struct btrfs_block_group_cache
*cache
;
5543 cache
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
5548 * pull in the free space cache (if any) so that our pin
5549 * removes the free space from the cache. We have load_only set
5550 * to one because the slow code to read in the free extents does check
5551 * the pinned extents.
5553 cache_block_group(cache
, 1);
5555 pin_down_extent(root
, cache
, bytenr
, num_bytes
, 0);
5557 /* remove us from the free space cache (if we're there at all) */
5558 ret
= btrfs_remove_free_space(cache
, bytenr
, num_bytes
);
5559 btrfs_put_block_group(cache
);
5563 static int __exclude_logged_extent(struct btrfs_root
*root
, u64 start
, u64 num_bytes
)
5566 struct btrfs_block_group_cache
*block_group
;
5567 struct btrfs_caching_control
*caching_ctl
;
5569 block_group
= btrfs_lookup_block_group(root
->fs_info
, start
);
5573 cache_block_group(block_group
, 0);
5574 caching_ctl
= get_caching_control(block_group
);
5578 BUG_ON(!block_group_cache_done(block_group
));
5579 ret
= btrfs_remove_free_space(block_group
, start
, num_bytes
);
5581 mutex_lock(&caching_ctl
->mutex
);
5583 if (start
>= caching_ctl
->progress
) {
5584 ret
= add_excluded_extent(root
, start
, num_bytes
);
5585 } else if (start
+ num_bytes
<= caching_ctl
->progress
) {
5586 ret
= btrfs_remove_free_space(block_group
,
5589 num_bytes
= caching_ctl
->progress
- start
;
5590 ret
= btrfs_remove_free_space(block_group
,
5595 num_bytes
= (start
+ num_bytes
) -
5596 caching_ctl
->progress
;
5597 start
= caching_ctl
->progress
;
5598 ret
= add_excluded_extent(root
, start
, num_bytes
);
5601 mutex_unlock(&caching_ctl
->mutex
);
5602 put_caching_control(caching_ctl
);
5604 btrfs_put_block_group(block_group
);
5608 int btrfs_exclude_logged_extents(struct btrfs_root
*log
,
5609 struct extent_buffer
*eb
)
5611 struct btrfs_file_extent_item
*item
;
5612 struct btrfs_key key
;
5616 if (!btrfs_fs_incompat(log
->fs_info
, MIXED_GROUPS
))
5619 for (i
= 0; i
< btrfs_header_nritems(eb
); i
++) {
5620 btrfs_item_key_to_cpu(eb
, &key
, i
);
5621 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
5623 item
= btrfs_item_ptr(eb
, i
, struct btrfs_file_extent_item
);
5624 found_type
= btrfs_file_extent_type(eb
, item
);
5625 if (found_type
== BTRFS_FILE_EXTENT_INLINE
)
5627 if (btrfs_file_extent_disk_bytenr(eb
, item
) == 0)
5629 key
.objectid
= btrfs_file_extent_disk_bytenr(eb
, item
);
5630 key
.offset
= btrfs_file_extent_disk_num_bytes(eb
, item
);
5631 __exclude_logged_extent(log
, key
.objectid
, key
.offset
);
5638 * btrfs_update_reserved_bytes - update the block_group and space info counters
5639 * @cache: The cache we are manipulating
5640 * @num_bytes: The number of bytes in question
5641 * @reserve: One of the reservation enums
5642 * @delalloc: The blocks are allocated for the delalloc write
5644 * This is called by the allocator when it reserves space, or by somebody who is
5645 * freeing space that was never actually used on disk. For example if you
5646 * reserve some space for a new leaf in transaction A and before transaction A
5647 * commits you free that leaf, you call this with reserve set to 0 in order to
5648 * clear the reservation.
5650 * Metadata reservations should be called with RESERVE_ALLOC so we do the proper
5651 * ENOSPC accounting. For data we handle the reservation through clearing the
5652 * delalloc bits in the io_tree. We have to do this since we could end up
5653 * allocating less disk space for the amount of data we have reserved in the
5654 * case of compression.
5656 * If this is a reservation and the block group has become read only we cannot
5657 * make the reservation and return -EAGAIN, otherwise this function always
5660 static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache
*cache
,
5661 u64 num_bytes
, int reserve
, int delalloc
)
5663 struct btrfs_space_info
*space_info
= cache
->space_info
;
5666 spin_lock(&space_info
->lock
);
5667 spin_lock(&cache
->lock
);
5668 if (reserve
!= RESERVE_FREE
) {
5672 cache
->reserved
+= num_bytes
;
5673 space_info
->bytes_reserved
+= num_bytes
;
5674 if (reserve
== RESERVE_ALLOC
) {
5675 trace_btrfs_space_reservation(cache
->fs_info
,
5676 "space_info", space_info
->flags
,
5678 space_info
->bytes_may_use
-= num_bytes
;
5682 cache
->delalloc_bytes
+= num_bytes
;
5686 space_info
->bytes_readonly
+= num_bytes
;
5687 cache
->reserved
-= num_bytes
;
5688 space_info
->bytes_reserved
-= num_bytes
;
5691 cache
->delalloc_bytes
-= num_bytes
;
5693 spin_unlock(&cache
->lock
);
5694 spin_unlock(&space_info
->lock
);
5698 void btrfs_prepare_extent_commit(struct btrfs_trans_handle
*trans
,
5699 struct btrfs_root
*root
)
5701 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5702 struct btrfs_caching_control
*next
;
5703 struct btrfs_caching_control
*caching_ctl
;
5704 struct btrfs_block_group_cache
*cache
;
5706 down_write(&fs_info
->commit_root_sem
);
5708 list_for_each_entry_safe(caching_ctl
, next
,
5709 &fs_info
->caching_block_groups
, list
) {
5710 cache
= caching_ctl
->block_group
;
5711 if (block_group_cache_done(cache
)) {
5712 cache
->last_byte_to_unpin
= (u64
)-1;
5713 list_del_init(&caching_ctl
->list
);
5714 put_caching_control(caching_ctl
);
5716 cache
->last_byte_to_unpin
= caching_ctl
->progress
;
5720 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
5721 fs_info
->pinned_extents
= &fs_info
->freed_extents
[1];
5723 fs_info
->pinned_extents
= &fs_info
->freed_extents
[0];
5725 up_write(&fs_info
->commit_root_sem
);
5727 update_global_block_rsv(fs_info
);
5730 static int unpin_extent_range(struct btrfs_root
*root
, u64 start
, u64 end
)
5732 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5733 struct btrfs_block_group_cache
*cache
= NULL
;
5734 struct btrfs_space_info
*space_info
;
5735 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
5739 while (start
<= end
) {
5742 start
>= cache
->key
.objectid
+ cache
->key
.offset
) {
5744 btrfs_put_block_group(cache
);
5745 cache
= btrfs_lookup_block_group(fs_info
, start
);
5746 BUG_ON(!cache
); /* Logic error */
5749 len
= cache
->key
.objectid
+ cache
->key
.offset
- start
;
5750 len
= min(len
, end
+ 1 - start
);
5752 if (start
< cache
->last_byte_to_unpin
) {
5753 len
= min(len
, cache
->last_byte_to_unpin
- start
);
5754 btrfs_add_free_space(cache
, start
, len
);
5758 space_info
= cache
->space_info
;
5760 spin_lock(&space_info
->lock
);
5761 spin_lock(&cache
->lock
);
5762 cache
->pinned
-= len
;
5763 space_info
->bytes_pinned
-= len
;
5764 percpu_counter_add(&space_info
->total_bytes_pinned
, -len
);
5766 space_info
->bytes_readonly
+= len
;
5769 spin_unlock(&cache
->lock
);
5770 if (!readonly
&& global_rsv
->space_info
== space_info
) {
5771 spin_lock(&global_rsv
->lock
);
5772 if (!global_rsv
->full
) {
5773 len
= min(len
, global_rsv
->size
-
5774 global_rsv
->reserved
);
5775 global_rsv
->reserved
+= len
;
5776 space_info
->bytes_may_use
+= len
;
5777 if (global_rsv
->reserved
>= global_rsv
->size
)
5778 global_rsv
->full
= 1;
5780 spin_unlock(&global_rsv
->lock
);
5782 spin_unlock(&space_info
->lock
);
5786 btrfs_put_block_group(cache
);
5790 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
5791 struct btrfs_root
*root
)
5793 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5794 struct extent_io_tree
*unpin
;
5802 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
5803 unpin
= &fs_info
->freed_extents
[1];
5805 unpin
= &fs_info
->freed_extents
[0];
5808 ret
= find_first_extent_bit(unpin
, 0, &start
, &end
,
5809 EXTENT_DIRTY
, NULL
);
5813 if (btrfs_test_opt(root
, DISCARD
))
5814 ret
= btrfs_discard_extent(root
, start
,
5815 end
+ 1 - start
, NULL
);
5817 clear_extent_dirty(unpin
, start
, end
, GFP_NOFS
);
5818 unpin_extent_range(root
, start
, end
);
5825 static void add_pinned_bytes(struct btrfs_fs_info
*fs_info
, u64 num_bytes
,
5826 u64 owner
, u64 root_objectid
)
5828 struct btrfs_space_info
*space_info
;
5831 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
5832 if (root_objectid
== BTRFS_CHUNK_TREE_OBJECTID
)
5833 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
5835 flags
= BTRFS_BLOCK_GROUP_METADATA
;
5837 flags
= BTRFS_BLOCK_GROUP_DATA
;
5840 space_info
= __find_space_info(fs_info
, flags
);
5841 BUG_ON(!space_info
); /* Logic bug */
5842 percpu_counter_add(&space_info
->total_bytes_pinned
, num_bytes
);
5846 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
5847 struct btrfs_root
*root
,
5848 u64 bytenr
, u64 num_bytes
, u64 parent
,
5849 u64 root_objectid
, u64 owner_objectid
,
5850 u64 owner_offset
, int refs_to_drop
,
5851 struct btrfs_delayed_extent_op
*extent_op
,
5854 struct btrfs_key key
;
5855 struct btrfs_path
*path
;
5856 struct btrfs_fs_info
*info
= root
->fs_info
;
5857 struct btrfs_root
*extent_root
= info
->extent_root
;
5858 struct extent_buffer
*leaf
;
5859 struct btrfs_extent_item
*ei
;
5860 struct btrfs_extent_inline_ref
*iref
;
5863 int extent_slot
= 0;
5864 int found_extent
= 0;
5869 enum btrfs_qgroup_operation_type type
= BTRFS_QGROUP_OPER_SUB_EXCL
;
5870 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
5873 if (!info
->quota_enabled
|| !is_fstree(root_objectid
))
5876 path
= btrfs_alloc_path();
5881 path
->leave_spinning
= 1;
5883 is_data
= owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
;
5884 BUG_ON(!is_data
&& refs_to_drop
!= 1);
5887 skinny_metadata
= 0;
5889 ret
= lookup_extent_backref(trans
, extent_root
, path
, &iref
,
5890 bytenr
, num_bytes
, parent
,
5891 root_objectid
, owner_objectid
,
5894 extent_slot
= path
->slots
[0];
5895 while (extent_slot
>= 0) {
5896 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
5898 if (key
.objectid
!= bytenr
)
5900 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
5901 key
.offset
== num_bytes
) {
5905 if (key
.type
== BTRFS_METADATA_ITEM_KEY
&&
5906 key
.offset
== owner_objectid
) {
5910 if (path
->slots
[0] - extent_slot
> 5)
5914 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
5915 item_size
= btrfs_item_size_nr(path
->nodes
[0], extent_slot
);
5916 if (found_extent
&& item_size
< sizeof(*ei
))
5919 if (!found_extent
) {
5921 ret
= remove_extent_backref(trans
, extent_root
, path
,
5923 is_data
, &last_ref
);
5925 btrfs_abort_transaction(trans
, extent_root
, ret
);
5928 btrfs_release_path(path
);
5929 path
->leave_spinning
= 1;
5931 key
.objectid
= bytenr
;
5932 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
5933 key
.offset
= num_bytes
;
5935 if (!is_data
&& skinny_metadata
) {
5936 key
.type
= BTRFS_METADATA_ITEM_KEY
;
5937 key
.offset
= owner_objectid
;
5940 ret
= btrfs_search_slot(trans
, extent_root
,
5942 if (ret
> 0 && skinny_metadata
&& path
->slots
[0]) {
5944 * Couldn't find our skinny metadata item,
5945 * see if we have ye olde extent item.
5948 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
5950 if (key
.objectid
== bytenr
&&
5951 key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
5952 key
.offset
== num_bytes
)
5956 if (ret
> 0 && skinny_metadata
) {
5957 skinny_metadata
= false;
5958 key
.objectid
= bytenr
;
5959 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
5960 key
.offset
= num_bytes
;
5961 btrfs_release_path(path
);
5962 ret
= btrfs_search_slot(trans
, extent_root
,
5967 btrfs_err(info
, "umm, got %d back from search, was looking for %llu",
5970 btrfs_print_leaf(extent_root
,
5974 btrfs_abort_transaction(trans
, extent_root
, ret
);
5977 extent_slot
= path
->slots
[0];
5979 } else if (WARN_ON(ret
== -ENOENT
)) {
5980 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
5982 "unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu",
5983 bytenr
, parent
, root_objectid
, owner_objectid
,
5985 btrfs_abort_transaction(trans
, extent_root
, ret
);
5988 btrfs_abort_transaction(trans
, extent_root
, ret
);
5992 leaf
= path
->nodes
[0];
5993 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
5994 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
5995 if (item_size
< sizeof(*ei
)) {
5996 BUG_ON(found_extent
|| extent_slot
!= path
->slots
[0]);
5997 ret
= convert_extent_item_v0(trans
, extent_root
, path
,
6000 btrfs_abort_transaction(trans
, extent_root
, ret
);
6004 btrfs_release_path(path
);
6005 path
->leave_spinning
= 1;
6007 key
.objectid
= bytenr
;
6008 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
6009 key
.offset
= num_bytes
;
6011 ret
= btrfs_search_slot(trans
, extent_root
, &key
, path
,
6014 btrfs_err(info
, "umm, got %d back from search, was looking for %llu",
6016 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
6019 btrfs_abort_transaction(trans
, extent_root
, ret
);
6023 extent_slot
= path
->slots
[0];
6024 leaf
= path
->nodes
[0];
6025 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
6028 BUG_ON(item_size
< sizeof(*ei
));
6029 ei
= btrfs_item_ptr(leaf
, extent_slot
,
6030 struct btrfs_extent_item
);
6031 if (owner_objectid
< BTRFS_FIRST_FREE_OBJECTID
&&
6032 key
.type
== BTRFS_EXTENT_ITEM_KEY
) {
6033 struct btrfs_tree_block_info
*bi
;
6034 BUG_ON(item_size
< sizeof(*ei
) + sizeof(*bi
));
6035 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
6036 WARN_ON(owner_objectid
!= btrfs_tree_block_level(leaf
, bi
));
6039 refs
= btrfs_extent_refs(leaf
, ei
);
6040 if (refs
< refs_to_drop
) {
6041 btrfs_err(info
, "trying to drop %d refs but we only have %Lu "
6042 "for bytenr %Lu", refs_to_drop
, refs
, bytenr
);
6044 btrfs_abort_transaction(trans
, extent_root
, ret
);
6047 refs
-= refs_to_drop
;
6050 type
= BTRFS_QGROUP_OPER_SUB_SHARED
;
6052 __run_delayed_extent_op(extent_op
, leaf
, ei
);
6054 * In the case of inline back ref, reference count will
6055 * be updated by remove_extent_backref
6058 BUG_ON(!found_extent
);
6060 btrfs_set_extent_refs(leaf
, ei
, refs
);
6061 btrfs_mark_buffer_dirty(leaf
);
6064 ret
= remove_extent_backref(trans
, extent_root
, path
,
6066 is_data
, &last_ref
);
6068 btrfs_abort_transaction(trans
, extent_root
, ret
);
6072 add_pinned_bytes(root
->fs_info
, -num_bytes
, owner_objectid
,
6076 BUG_ON(is_data
&& refs_to_drop
!=
6077 extent_data_ref_count(root
, path
, iref
));
6079 BUG_ON(path
->slots
[0] != extent_slot
);
6081 BUG_ON(path
->slots
[0] != extent_slot
+ 1);
6082 path
->slots
[0] = extent_slot
;
6088 ret
= btrfs_del_items(trans
, extent_root
, path
, path
->slots
[0],
6091 btrfs_abort_transaction(trans
, extent_root
, ret
);
6094 btrfs_release_path(path
);
6097 ret
= btrfs_del_csums(trans
, root
, bytenr
, num_bytes
);
6099 btrfs_abort_transaction(trans
, extent_root
, ret
);
6104 ret
= update_block_group(root
, bytenr
, num_bytes
, 0);
6106 btrfs_abort_transaction(trans
, extent_root
, ret
);
6110 btrfs_release_path(path
);
6112 /* Deal with the quota accounting */
6113 if (!ret
&& last_ref
&& !no_quota
) {
6116 if (owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
&&
6117 type
== BTRFS_QGROUP_OPER_SUB_SHARED
)
6120 ret
= btrfs_qgroup_record_ref(trans
, info
, root_objectid
,
6121 bytenr
, num_bytes
, type
,
6125 btrfs_free_path(path
);
6130 * when we free an block, it is possible (and likely) that we free the last
6131 * delayed ref for that extent as well. This searches the delayed ref tree for
6132 * a given extent, and if there are no other delayed refs to be processed, it
6133 * removes it from the tree.
6135 static noinline
int check_ref_cleanup(struct btrfs_trans_handle
*trans
,
6136 struct btrfs_root
*root
, u64 bytenr
)
6138 struct btrfs_delayed_ref_head
*head
;
6139 struct btrfs_delayed_ref_root
*delayed_refs
;
6142 delayed_refs
= &trans
->transaction
->delayed_refs
;
6143 spin_lock(&delayed_refs
->lock
);
6144 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
6146 goto out_delayed_unlock
;
6148 spin_lock(&head
->lock
);
6149 if (rb_first(&head
->ref_root
))
6152 if (head
->extent_op
) {
6153 if (!head
->must_insert_reserved
)
6155 btrfs_free_delayed_extent_op(head
->extent_op
);
6156 head
->extent_op
= NULL
;
6160 * waiting for the lock here would deadlock. If someone else has it
6161 * locked they are already in the process of dropping it anyway
6163 if (!mutex_trylock(&head
->mutex
))
6167 * at this point we have a head with no other entries. Go
6168 * ahead and process it.
6170 head
->node
.in_tree
= 0;
6171 rb_erase(&head
->href_node
, &delayed_refs
->href_root
);
6173 atomic_dec(&delayed_refs
->num_entries
);
6176 * we don't take a ref on the node because we're removing it from the
6177 * tree, so we just steal the ref the tree was holding.
6179 delayed_refs
->num_heads
--;
6180 if (head
->processing
== 0)
6181 delayed_refs
->num_heads_ready
--;
6182 head
->processing
= 0;
6183 spin_unlock(&head
->lock
);
6184 spin_unlock(&delayed_refs
->lock
);
6186 BUG_ON(head
->extent_op
);
6187 if (head
->must_insert_reserved
)
6190 mutex_unlock(&head
->mutex
);
6191 btrfs_put_delayed_ref(&head
->node
);
6194 spin_unlock(&head
->lock
);
6197 spin_unlock(&delayed_refs
->lock
);
6201 void btrfs_free_tree_block(struct btrfs_trans_handle
*trans
,
6202 struct btrfs_root
*root
,
6203 struct extent_buffer
*buf
,
6204 u64 parent
, int last_ref
)
6206 struct btrfs_block_group_cache
*cache
= NULL
;
6210 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
6211 ret
= btrfs_add_delayed_tree_ref(root
->fs_info
, trans
,
6212 buf
->start
, buf
->len
,
6213 parent
, root
->root_key
.objectid
,
6214 btrfs_header_level(buf
),
6215 BTRFS_DROP_DELAYED_REF
, NULL
, 0);
6216 BUG_ON(ret
); /* -ENOMEM */
6222 cache
= btrfs_lookup_block_group(root
->fs_info
, buf
->start
);
6224 if (btrfs_header_generation(buf
) == trans
->transid
) {
6225 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
6226 ret
= check_ref_cleanup(trans
, root
, buf
->start
);
6231 if (btrfs_header_flag(buf
, BTRFS_HEADER_FLAG_WRITTEN
)) {
6232 pin_down_extent(root
, cache
, buf
->start
, buf
->len
, 1);
6236 WARN_ON(test_bit(EXTENT_BUFFER_DIRTY
, &buf
->bflags
));
6238 btrfs_add_free_space(cache
, buf
->start
, buf
->len
);
6239 btrfs_update_reserved_bytes(cache
, buf
->len
, RESERVE_FREE
, 0);
6240 trace_btrfs_reserved_extent_free(root
, buf
->start
, buf
->len
);
6245 add_pinned_bytes(root
->fs_info
, buf
->len
,
6246 btrfs_header_level(buf
),
6247 root
->root_key
.objectid
);
6250 * Deleting the buffer, clear the corrupt flag since it doesn't matter
6253 clear_bit(EXTENT_BUFFER_CORRUPT
, &buf
->bflags
);
6254 btrfs_put_block_group(cache
);
6257 /* Can return -ENOMEM */
6258 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
6259 u64 bytenr
, u64 num_bytes
, u64 parent
, u64 root_objectid
,
6260 u64 owner
, u64 offset
, int no_quota
)
6263 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
6265 if (btrfs_test_is_dummy_root(root
))
6268 add_pinned_bytes(root
->fs_info
, num_bytes
, owner
, root_objectid
);
6271 * tree log blocks never actually go into the extent allocation
6272 * tree, just update pinning info and exit early.
6274 if (root_objectid
== BTRFS_TREE_LOG_OBJECTID
) {
6275 WARN_ON(owner
>= BTRFS_FIRST_FREE_OBJECTID
);
6276 /* unlocks the pinned mutex */
6277 btrfs_pin_extent(root
, bytenr
, num_bytes
, 1);
6279 } else if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
6280 ret
= btrfs_add_delayed_tree_ref(fs_info
, trans
, bytenr
,
6282 parent
, root_objectid
, (int)owner
,
6283 BTRFS_DROP_DELAYED_REF
, NULL
, no_quota
);
6285 ret
= btrfs_add_delayed_data_ref(fs_info
, trans
, bytenr
,
6287 parent
, root_objectid
, owner
,
6288 offset
, BTRFS_DROP_DELAYED_REF
,
6295 * when we wait for progress in the block group caching, its because
6296 * our allocation attempt failed at least once. So, we must sleep
6297 * and let some progress happen before we try again.
6299 * This function will sleep at least once waiting for new free space to
6300 * show up, and then it will check the block group free space numbers
6301 * for our min num_bytes. Another option is to have it go ahead
6302 * and look in the rbtree for a free extent of a given size, but this
6305 * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using
6306 * any of the information in this block group.
6308 static noinline
void
6309 wait_block_group_cache_progress(struct btrfs_block_group_cache
*cache
,
6312 struct btrfs_caching_control
*caching_ctl
;
6314 caching_ctl
= get_caching_control(cache
);
6318 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
) ||
6319 (cache
->free_space_ctl
->free_space
>= num_bytes
));
6321 put_caching_control(caching_ctl
);
6325 wait_block_group_cache_done(struct btrfs_block_group_cache
*cache
)
6327 struct btrfs_caching_control
*caching_ctl
;
6330 caching_ctl
= get_caching_control(cache
);
6332 return (cache
->cached
== BTRFS_CACHE_ERROR
) ? -EIO
: 0;
6334 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
));
6335 if (cache
->cached
== BTRFS_CACHE_ERROR
)
6337 put_caching_control(caching_ctl
);
6341 int __get_raid_index(u64 flags
)
6343 if (flags
& BTRFS_BLOCK_GROUP_RAID10
)
6344 return BTRFS_RAID_RAID10
;
6345 else if (flags
& BTRFS_BLOCK_GROUP_RAID1
)
6346 return BTRFS_RAID_RAID1
;
6347 else if (flags
& BTRFS_BLOCK_GROUP_DUP
)
6348 return BTRFS_RAID_DUP
;
6349 else if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
6350 return BTRFS_RAID_RAID0
;
6351 else if (flags
& BTRFS_BLOCK_GROUP_RAID5
)
6352 return BTRFS_RAID_RAID5
;
6353 else if (flags
& BTRFS_BLOCK_GROUP_RAID6
)
6354 return BTRFS_RAID_RAID6
;
6356 return BTRFS_RAID_SINGLE
; /* BTRFS_BLOCK_GROUP_SINGLE */
6359 int get_block_group_index(struct btrfs_block_group_cache
*cache
)
6361 return __get_raid_index(cache
->flags
);
6364 static const char *btrfs_raid_type_names
[BTRFS_NR_RAID_TYPES
] = {
6365 [BTRFS_RAID_RAID10
] = "raid10",
6366 [BTRFS_RAID_RAID1
] = "raid1",
6367 [BTRFS_RAID_DUP
] = "dup",
6368 [BTRFS_RAID_RAID0
] = "raid0",
6369 [BTRFS_RAID_SINGLE
] = "single",
6370 [BTRFS_RAID_RAID5
] = "raid5",
6371 [BTRFS_RAID_RAID6
] = "raid6",
6374 static const char *get_raid_name(enum btrfs_raid_types type
)
6376 if (type
>= BTRFS_NR_RAID_TYPES
)
6379 return btrfs_raid_type_names
[type
];
6382 enum btrfs_loop_type
{
6383 LOOP_CACHING_NOWAIT
= 0,
6384 LOOP_CACHING_WAIT
= 1,
6385 LOOP_ALLOC_CHUNK
= 2,
6386 LOOP_NO_EMPTY_SIZE
= 3,
6390 btrfs_lock_block_group(struct btrfs_block_group_cache
*cache
,
6394 down_read(&cache
->data_rwsem
);
6398 btrfs_grab_block_group(struct btrfs_block_group_cache
*cache
,
6401 btrfs_get_block_group(cache
);
6403 down_read(&cache
->data_rwsem
);
6406 static struct btrfs_block_group_cache
*
6407 btrfs_lock_cluster(struct btrfs_block_group_cache
*block_group
,
6408 struct btrfs_free_cluster
*cluster
,
6411 struct btrfs_block_group_cache
*used_bg
;
6412 bool locked
= false;
6414 spin_lock(&cluster
->refill_lock
);
6416 if (used_bg
== cluster
->block_group
)
6419 up_read(&used_bg
->data_rwsem
);
6420 btrfs_put_block_group(used_bg
);
6423 used_bg
= cluster
->block_group
;
6427 if (used_bg
== block_group
)
6430 btrfs_get_block_group(used_bg
);
6435 if (down_read_trylock(&used_bg
->data_rwsem
))
6438 spin_unlock(&cluster
->refill_lock
);
6439 down_read(&used_bg
->data_rwsem
);
6445 btrfs_release_block_group(struct btrfs_block_group_cache
*cache
,
6449 up_read(&cache
->data_rwsem
);
6450 btrfs_put_block_group(cache
);
6454 * walks the btree of allocated extents and find a hole of a given size.
6455 * The key ins is changed to record the hole:
6456 * ins->objectid == start position
6457 * ins->flags = BTRFS_EXTENT_ITEM_KEY
6458 * ins->offset == the size of the hole.
6459 * Any available blocks before search_start are skipped.
6461 * If there is no suitable free space, we will record the max size of
6462 * the free space extent currently.
6464 static noinline
int find_free_extent(struct btrfs_root
*orig_root
,
6465 u64 num_bytes
, u64 empty_size
,
6466 u64 hint_byte
, struct btrfs_key
*ins
,
6467 u64 flags
, int delalloc
)
6470 struct btrfs_root
*root
= orig_root
->fs_info
->extent_root
;
6471 struct btrfs_free_cluster
*last_ptr
= NULL
;
6472 struct btrfs_block_group_cache
*block_group
= NULL
;
6473 u64 search_start
= 0;
6474 u64 max_extent_size
= 0;
6475 int empty_cluster
= 2 * 1024 * 1024;
6476 struct btrfs_space_info
*space_info
;
6478 int index
= __get_raid_index(flags
);
6479 int alloc_type
= (flags
& BTRFS_BLOCK_GROUP_DATA
) ?
6480 RESERVE_ALLOC_NO_ACCOUNT
: RESERVE_ALLOC
;
6481 bool failed_cluster_refill
= false;
6482 bool failed_alloc
= false;
6483 bool use_cluster
= true;
6484 bool have_caching_bg
= false;
6486 WARN_ON(num_bytes
< root
->sectorsize
);
6487 ins
->type
= BTRFS_EXTENT_ITEM_KEY
;
6491 trace_find_free_extent(orig_root
, num_bytes
, empty_size
, flags
);
6493 space_info
= __find_space_info(root
->fs_info
, flags
);
6495 btrfs_err(root
->fs_info
, "No space info for %llu", flags
);
6500 * If the space info is for both data and metadata it means we have a
6501 * small filesystem and we can't use the clustering stuff.
6503 if (btrfs_mixed_space_info(space_info
))
6504 use_cluster
= false;
6506 if (flags
& BTRFS_BLOCK_GROUP_METADATA
&& use_cluster
) {
6507 last_ptr
= &root
->fs_info
->meta_alloc_cluster
;
6508 if (!btrfs_test_opt(root
, SSD
))
6509 empty_cluster
= 64 * 1024;
6512 if ((flags
& BTRFS_BLOCK_GROUP_DATA
) && use_cluster
&&
6513 btrfs_test_opt(root
, SSD
)) {
6514 last_ptr
= &root
->fs_info
->data_alloc_cluster
;
6518 spin_lock(&last_ptr
->lock
);
6519 if (last_ptr
->block_group
)
6520 hint_byte
= last_ptr
->window_start
;
6521 spin_unlock(&last_ptr
->lock
);
6524 search_start
= max(search_start
, first_logical_byte(root
, 0));
6525 search_start
= max(search_start
, hint_byte
);
6530 if (search_start
== hint_byte
) {
6531 block_group
= btrfs_lookup_block_group(root
->fs_info
,
6534 * we don't want to use the block group if it doesn't match our
6535 * allocation bits, or if its not cached.
6537 * However if we are re-searching with an ideal block group
6538 * picked out then we don't care that the block group is cached.
6540 if (block_group
&& block_group_bits(block_group
, flags
) &&
6541 block_group
->cached
!= BTRFS_CACHE_NO
) {
6542 down_read(&space_info
->groups_sem
);
6543 if (list_empty(&block_group
->list
) ||
6546 * someone is removing this block group,
6547 * we can't jump into the have_block_group
6548 * target because our list pointers are not
6551 btrfs_put_block_group(block_group
);
6552 up_read(&space_info
->groups_sem
);
6554 index
= get_block_group_index(block_group
);
6555 btrfs_lock_block_group(block_group
, delalloc
);
6556 goto have_block_group
;
6558 } else if (block_group
) {
6559 btrfs_put_block_group(block_group
);
6563 have_caching_bg
= false;
6564 down_read(&space_info
->groups_sem
);
6565 list_for_each_entry(block_group
, &space_info
->block_groups
[index
],
6570 btrfs_grab_block_group(block_group
, delalloc
);
6571 search_start
= block_group
->key
.objectid
;
6574 * this can happen if we end up cycling through all the
6575 * raid types, but we want to make sure we only allocate
6576 * for the proper type.
6578 if (!block_group_bits(block_group
, flags
)) {
6579 u64 extra
= BTRFS_BLOCK_GROUP_DUP
|
6580 BTRFS_BLOCK_GROUP_RAID1
|
6581 BTRFS_BLOCK_GROUP_RAID5
|
6582 BTRFS_BLOCK_GROUP_RAID6
|
6583 BTRFS_BLOCK_GROUP_RAID10
;
6586 * if they asked for extra copies and this block group
6587 * doesn't provide them, bail. This does allow us to
6588 * fill raid0 from raid1.
6590 if ((flags
& extra
) && !(block_group
->flags
& extra
))
6595 cached
= block_group_cache_done(block_group
);
6596 if (unlikely(!cached
)) {
6597 ret
= cache_block_group(block_group
, 0);
6602 if (unlikely(block_group
->cached
== BTRFS_CACHE_ERROR
))
6604 if (unlikely(block_group
->ro
))
6608 * Ok we want to try and use the cluster allocator, so
6612 struct btrfs_block_group_cache
*used_block_group
;
6613 unsigned long aligned_cluster
;
6615 * the refill lock keeps out other
6616 * people trying to start a new cluster
6618 used_block_group
= btrfs_lock_cluster(block_group
,
6621 if (!used_block_group
)
6622 goto refill_cluster
;
6624 if (used_block_group
!= block_group
&&
6625 (used_block_group
->ro
||
6626 !block_group_bits(used_block_group
, flags
)))
6627 goto release_cluster
;
6629 offset
= btrfs_alloc_from_cluster(used_block_group
,
6632 used_block_group
->key
.objectid
,
6635 /* we have a block, we're done */
6636 spin_unlock(&last_ptr
->refill_lock
);
6637 trace_btrfs_reserve_extent_cluster(root
,
6639 search_start
, num_bytes
);
6640 if (used_block_group
!= block_group
) {
6641 btrfs_release_block_group(block_group
,
6643 block_group
= used_block_group
;
6648 WARN_ON(last_ptr
->block_group
!= used_block_group
);
6650 /* If we are on LOOP_NO_EMPTY_SIZE, we can't
6651 * set up a new clusters, so lets just skip it
6652 * and let the allocator find whatever block
6653 * it can find. If we reach this point, we
6654 * will have tried the cluster allocator
6655 * plenty of times and not have found
6656 * anything, so we are likely way too
6657 * fragmented for the clustering stuff to find
6660 * However, if the cluster is taken from the
6661 * current block group, release the cluster
6662 * first, so that we stand a better chance of
6663 * succeeding in the unclustered
6665 if (loop
>= LOOP_NO_EMPTY_SIZE
&&
6666 used_block_group
!= block_group
) {
6667 spin_unlock(&last_ptr
->refill_lock
);
6668 btrfs_release_block_group(used_block_group
,
6670 goto unclustered_alloc
;
6674 * this cluster didn't work out, free it and
6677 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
6679 if (used_block_group
!= block_group
)
6680 btrfs_release_block_group(used_block_group
,
6683 if (loop
>= LOOP_NO_EMPTY_SIZE
) {
6684 spin_unlock(&last_ptr
->refill_lock
);
6685 goto unclustered_alloc
;
6688 aligned_cluster
= max_t(unsigned long,
6689 empty_cluster
+ empty_size
,
6690 block_group
->full_stripe_len
);
6692 /* allocate a cluster in this block group */
6693 ret
= btrfs_find_space_cluster(root
, block_group
,
6694 last_ptr
, search_start
,
6699 * now pull our allocation out of this
6702 offset
= btrfs_alloc_from_cluster(block_group
,
6708 /* we found one, proceed */
6709 spin_unlock(&last_ptr
->refill_lock
);
6710 trace_btrfs_reserve_extent_cluster(root
,
6711 block_group
, search_start
,
6715 } else if (!cached
&& loop
> LOOP_CACHING_NOWAIT
6716 && !failed_cluster_refill
) {
6717 spin_unlock(&last_ptr
->refill_lock
);
6719 failed_cluster_refill
= true;
6720 wait_block_group_cache_progress(block_group
,
6721 num_bytes
+ empty_cluster
+ empty_size
);
6722 goto have_block_group
;
6726 * at this point we either didn't find a cluster
6727 * or we weren't able to allocate a block from our
6728 * cluster. Free the cluster we've been trying
6729 * to use, and go to the next block group
6731 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
6732 spin_unlock(&last_ptr
->refill_lock
);
6737 spin_lock(&block_group
->free_space_ctl
->tree_lock
);
6739 block_group
->free_space_ctl
->free_space
<
6740 num_bytes
+ empty_cluster
+ empty_size
) {
6741 if (block_group
->free_space_ctl
->free_space
>
6744 block_group
->free_space_ctl
->free_space
;
6745 spin_unlock(&block_group
->free_space_ctl
->tree_lock
);
6748 spin_unlock(&block_group
->free_space_ctl
->tree_lock
);
6750 offset
= btrfs_find_space_for_alloc(block_group
, search_start
,
6751 num_bytes
, empty_size
,
6754 * If we didn't find a chunk, and we haven't failed on this
6755 * block group before, and this block group is in the middle of
6756 * caching and we are ok with waiting, then go ahead and wait
6757 * for progress to be made, and set failed_alloc to true.
6759 * If failed_alloc is true then we've already waited on this
6760 * block group once and should move on to the next block group.
6762 if (!offset
&& !failed_alloc
&& !cached
&&
6763 loop
> LOOP_CACHING_NOWAIT
) {
6764 wait_block_group_cache_progress(block_group
,
6765 num_bytes
+ empty_size
);
6766 failed_alloc
= true;
6767 goto have_block_group
;
6768 } else if (!offset
) {
6770 have_caching_bg
= true;
6774 search_start
= ALIGN(offset
, root
->stripesize
);
6776 /* move on to the next group */
6777 if (search_start
+ num_bytes
>
6778 block_group
->key
.objectid
+ block_group
->key
.offset
) {
6779 btrfs_add_free_space(block_group
, offset
, num_bytes
);
6783 if (offset
< search_start
)
6784 btrfs_add_free_space(block_group
, offset
,
6785 search_start
- offset
);
6786 BUG_ON(offset
> search_start
);
6788 ret
= btrfs_update_reserved_bytes(block_group
, num_bytes
,
6789 alloc_type
, delalloc
);
6790 if (ret
== -EAGAIN
) {
6791 btrfs_add_free_space(block_group
, offset
, num_bytes
);
6795 /* we are all good, lets return */
6796 ins
->objectid
= search_start
;
6797 ins
->offset
= num_bytes
;
6799 trace_btrfs_reserve_extent(orig_root
, block_group
,
6800 search_start
, num_bytes
);
6801 btrfs_release_block_group(block_group
, delalloc
);
6804 failed_cluster_refill
= false;
6805 failed_alloc
= false;
6806 BUG_ON(index
!= get_block_group_index(block_group
));
6807 btrfs_release_block_group(block_group
, delalloc
);
6809 up_read(&space_info
->groups_sem
);
6811 if (!ins
->objectid
&& loop
>= LOOP_CACHING_WAIT
&& have_caching_bg
)
6814 if (!ins
->objectid
&& ++index
< BTRFS_NR_RAID_TYPES
)
6818 * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking
6819 * caching kthreads as we move along
6820 * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching
6821 * LOOP_ALLOC_CHUNK, force a chunk allocation and try again
6822 * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
6825 if (!ins
->objectid
&& loop
< LOOP_NO_EMPTY_SIZE
) {
6828 if (loop
== LOOP_ALLOC_CHUNK
) {
6829 struct btrfs_trans_handle
*trans
;
6832 trans
= current
->journal_info
;
6836 trans
= btrfs_join_transaction(root
);
6838 if (IS_ERR(trans
)) {
6839 ret
= PTR_ERR(trans
);
6843 ret
= do_chunk_alloc(trans
, root
, flags
,
6846 * Do not bail out on ENOSPC since we
6847 * can do more things.
6849 if (ret
< 0 && ret
!= -ENOSPC
)
6850 btrfs_abort_transaction(trans
,
6855 btrfs_end_transaction(trans
, root
);
6860 if (loop
== LOOP_NO_EMPTY_SIZE
) {
6866 } else if (!ins
->objectid
) {
6868 } else if (ins
->objectid
) {
6873 ins
->offset
= max_extent_size
;
6877 static void dump_space_info(struct btrfs_space_info
*info
, u64 bytes
,
6878 int dump_block_groups
)
6880 struct btrfs_block_group_cache
*cache
;
6883 spin_lock(&info
->lock
);
6884 printk(KERN_INFO
"BTRFS: space_info %llu has %llu free, is %sfull\n",
6886 info
->total_bytes
- info
->bytes_used
- info
->bytes_pinned
-
6887 info
->bytes_reserved
- info
->bytes_readonly
,
6888 (info
->full
) ? "" : "not ");
6889 printk(KERN_INFO
"BTRFS: space_info total=%llu, used=%llu, pinned=%llu, "
6890 "reserved=%llu, may_use=%llu, readonly=%llu\n",
6891 info
->total_bytes
, info
->bytes_used
, info
->bytes_pinned
,
6892 info
->bytes_reserved
, info
->bytes_may_use
,
6893 info
->bytes_readonly
);
6894 spin_unlock(&info
->lock
);
6896 if (!dump_block_groups
)
6899 down_read(&info
->groups_sem
);
6901 list_for_each_entry(cache
, &info
->block_groups
[index
], list
) {
6902 spin_lock(&cache
->lock
);
6903 printk(KERN_INFO
"BTRFS: "
6904 "block group %llu has %llu bytes, "
6905 "%llu used %llu pinned %llu reserved %s\n",
6906 cache
->key
.objectid
, cache
->key
.offset
,
6907 btrfs_block_group_used(&cache
->item
), cache
->pinned
,
6908 cache
->reserved
, cache
->ro
? "[readonly]" : "");
6909 btrfs_dump_free_space(cache
, bytes
);
6910 spin_unlock(&cache
->lock
);
6912 if (++index
< BTRFS_NR_RAID_TYPES
)
6914 up_read(&info
->groups_sem
);
6917 int btrfs_reserve_extent(struct btrfs_root
*root
,
6918 u64 num_bytes
, u64 min_alloc_size
,
6919 u64 empty_size
, u64 hint_byte
,
6920 struct btrfs_key
*ins
, int is_data
, int delalloc
)
6922 bool final_tried
= false;
6926 flags
= btrfs_get_alloc_profile(root
, is_data
);
6928 WARN_ON(num_bytes
< root
->sectorsize
);
6929 ret
= find_free_extent(root
, num_bytes
, empty_size
, hint_byte
, ins
,
6932 if (ret
== -ENOSPC
) {
6933 if (!final_tried
&& ins
->offset
) {
6934 num_bytes
= min(num_bytes
>> 1, ins
->offset
);
6935 num_bytes
= round_down(num_bytes
, root
->sectorsize
);
6936 num_bytes
= max(num_bytes
, min_alloc_size
);
6937 if (num_bytes
== min_alloc_size
)
6940 } else if (btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
6941 struct btrfs_space_info
*sinfo
;
6943 sinfo
= __find_space_info(root
->fs_info
, flags
);
6944 btrfs_err(root
->fs_info
, "allocation failed flags %llu, wanted %llu",
6947 dump_space_info(sinfo
, num_bytes
, 1);
6954 static int __btrfs_free_reserved_extent(struct btrfs_root
*root
,
6956 int pin
, int delalloc
)
6958 struct btrfs_block_group_cache
*cache
;
6961 cache
= btrfs_lookup_block_group(root
->fs_info
, start
);
6963 btrfs_err(root
->fs_info
, "Unable to find block group for %llu",
6968 if (btrfs_test_opt(root
, DISCARD
))
6969 ret
= btrfs_discard_extent(root
, start
, len
, NULL
);
6972 pin_down_extent(root
, cache
, start
, len
, 1);
6974 btrfs_add_free_space(cache
, start
, len
);
6975 btrfs_update_reserved_bytes(cache
, len
, RESERVE_FREE
, delalloc
);
6977 btrfs_put_block_group(cache
);
6979 trace_btrfs_reserved_extent_free(root
, start
, len
);
6984 int btrfs_free_reserved_extent(struct btrfs_root
*root
,
6985 u64 start
, u64 len
, int delalloc
)
6987 return __btrfs_free_reserved_extent(root
, start
, len
, 0, delalloc
);
6990 int btrfs_free_and_pin_reserved_extent(struct btrfs_root
*root
,
6993 return __btrfs_free_reserved_extent(root
, start
, len
, 1, 0);
6996 static int alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
6997 struct btrfs_root
*root
,
6998 u64 parent
, u64 root_objectid
,
6999 u64 flags
, u64 owner
, u64 offset
,
7000 struct btrfs_key
*ins
, int ref_mod
)
7003 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
7004 struct btrfs_extent_item
*extent_item
;
7005 struct btrfs_extent_inline_ref
*iref
;
7006 struct btrfs_path
*path
;
7007 struct extent_buffer
*leaf
;
7012 type
= BTRFS_SHARED_DATA_REF_KEY
;
7014 type
= BTRFS_EXTENT_DATA_REF_KEY
;
7016 size
= sizeof(*extent_item
) + btrfs_extent_inline_ref_size(type
);
7018 path
= btrfs_alloc_path();
7022 path
->leave_spinning
= 1;
7023 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
7026 btrfs_free_path(path
);
7030 leaf
= path
->nodes
[0];
7031 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
7032 struct btrfs_extent_item
);
7033 btrfs_set_extent_refs(leaf
, extent_item
, ref_mod
);
7034 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
7035 btrfs_set_extent_flags(leaf
, extent_item
,
7036 flags
| BTRFS_EXTENT_FLAG_DATA
);
7038 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
7039 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
7041 struct btrfs_shared_data_ref
*ref
;
7042 ref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
7043 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
7044 btrfs_set_shared_data_ref_count(leaf
, ref
, ref_mod
);
7046 struct btrfs_extent_data_ref
*ref
;
7047 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
7048 btrfs_set_extent_data_ref_root(leaf
, ref
, root_objectid
);
7049 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
7050 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
7051 btrfs_set_extent_data_ref_count(leaf
, ref
, ref_mod
);
7054 btrfs_mark_buffer_dirty(path
->nodes
[0]);
7055 btrfs_free_path(path
);
7057 /* Always set parent to 0 here since its exclusive anyway. */
7058 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
7059 ins
->objectid
, ins
->offset
,
7060 BTRFS_QGROUP_OPER_ADD_EXCL
, 0);
7064 ret
= update_block_group(root
, ins
->objectid
, ins
->offset
, 1);
7065 if (ret
) { /* -ENOENT, logic error */
7066 btrfs_err(fs_info
, "update block group failed for %llu %llu",
7067 ins
->objectid
, ins
->offset
);
7070 trace_btrfs_reserved_extent_alloc(root
, ins
->objectid
, ins
->offset
);
7074 static int alloc_reserved_tree_block(struct btrfs_trans_handle
*trans
,
7075 struct btrfs_root
*root
,
7076 u64 parent
, u64 root_objectid
,
7077 u64 flags
, struct btrfs_disk_key
*key
,
7078 int level
, struct btrfs_key
*ins
,
7082 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
7083 struct btrfs_extent_item
*extent_item
;
7084 struct btrfs_tree_block_info
*block_info
;
7085 struct btrfs_extent_inline_ref
*iref
;
7086 struct btrfs_path
*path
;
7087 struct extent_buffer
*leaf
;
7088 u32 size
= sizeof(*extent_item
) + sizeof(*iref
);
7089 u64 num_bytes
= ins
->offset
;
7090 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
7093 if (!skinny_metadata
)
7094 size
+= sizeof(*block_info
);
7096 path
= btrfs_alloc_path();
7098 btrfs_free_and_pin_reserved_extent(root
, ins
->objectid
,
7103 path
->leave_spinning
= 1;
7104 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
7107 btrfs_free_and_pin_reserved_extent(root
, ins
->objectid
,
7109 btrfs_free_path(path
);
7113 leaf
= path
->nodes
[0];
7114 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
7115 struct btrfs_extent_item
);
7116 btrfs_set_extent_refs(leaf
, extent_item
, 1);
7117 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
7118 btrfs_set_extent_flags(leaf
, extent_item
,
7119 flags
| BTRFS_EXTENT_FLAG_TREE_BLOCK
);
7121 if (skinny_metadata
) {
7122 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
7123 num_bytes
= root
->nodesize
;
7125 block_info
= (struct btrfs_tree_block_info
*)(extent_item
+ 1);
7126 btrfs_set_tree_block_key(leaf
, block_info
, key
);
7127 btrfs_set_tree_block_level(leaf
, block_info
, level
);
7128 iref
= (struct btrfs_extent_inline_ref
*)(block_info
+ 1);
7132 BUG_ON(!(flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
));
7133 btrfs_set_extent_inline_ref_type(leaf
, iref
,
7134 BTRFS_SHARED_BLOCK_REF_KEY
);
7135 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
7137 btrfs_set_extent_inline_ref_type(leaf
, iref
,
7138 BTRFS_TREE_BLOCK_REF_KEY
);
7139 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
7142 btrfs_mark_buffer_dirty(leaf
);
7143 btrfs_free_path(path
);
7146 ret
= btrfs_qgroup_record_ref(trans
, fs_info
, root_objectid
,
7147 ins
->objectid
, num_bytes
,
7148 BTRFS_QGROUP_OPER_ADD_EXCL
, 0);
7153 ret
= update_block_group(root
, ins
->objectid
, root
->nodesize
, 1);
7154 if (ret
) { /* -ENOENT, logic error */
7155 btrfs_err(fs_info
, "update block group failed for %llu %llu",
7156 ins
->objectid
, ins
->offset
);
7160 trace_btrfs_reserved_extent_alloc(root
, ins
->objectid
, root
->nodesize
);
7164 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
7165 struct btrfs_root
*root
,
7166 u64 root_objectid
, u64 owner
,
7167 u64 offset
, struct btrfs_key
*ins
)
7171 BUG_ON(root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
7173 ret
= btrfs_add_delayed_data_ref(root
->fs_info
, trans
, ins
->objectid
,
7175 root_objectid
, owner
, offset
,
7176 BTRFS_ADD_DELAYED_EXTENT
, NULL
, 0);
7181 * this is used by the tree logging recovery code. It records that
7182 * an extent has been allocated and makes sure to clear the free
7183 * space cache bits as well
7185 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle
*trans
,
7186 struct btrfs_root
*root
,
7187 u64 root_objectid
, u64 owner
, u64 offset
,
7188 struct btrfs_key
*ins
)
7191 struct btrfs_block_group_cache
*block_group
;
7194 * Mixed block groups will exclude before processing the log so we only
7195 * need to do the exlude dance if this fs isn't mixed.
7197 if (!btrfs_fs_incompat(root
->fs_info
, MIXED_GROUPS
)) {
7198 ret
= __exclude_logged_extent(root
, ins
->objectid
, ins
->offset
);
7203 block_group
= btrfs_lookup_block_group(root
->fs_info
, ins
->objectid
);
7207 ret
= btrfs_update_reserved_bytes(block_group
, ins
->offset
,
7208 RESERVE_ALLOC_NO_ACCOUNT
, 0);
7209 BUG_ON(ret
); /* logic error */
7210 ret
= alloc_reserved_file_extent(trans
, root
, 0, root_objectid
,
7211 0, owner
, offset
, ins
, 1);
7212 btrfs_put_block_group(block_group
);
7216 static struct extent_buffer
*
7217 btrfs_init_new_buffer(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
7218 u64 bytenr
, u32 blocksize
, int level
)
7220 struct extent_buffer
*buf
;
7222 buf
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
7224 return ERR_PTR(-ENOMEM
);
7225 btrfs_set_header_generation(buf
, trans
->transid
);
7226 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, buf
, level
);
7227 btrfs_tree_lock(buf
);
7228 clean_tree_block(trans
, root
, buf
);
7229 clear_bit(EXTENT_BUFFER_STALE
, &buf
->bflags
);
7231 btrfs_set_lock_blocking(buf
);
7232 btrfs_set_buffer_uptodate(buf
);
7234 if (root
->root_key
.objectid
== BTRFS_TREE_LOG_OBJECTID
) {
7235 buf
->log_index
= root
->log_transid
% 2;
7237 * we allow two log transactions at a time, use different
7238 * EXENT bit to differentiate dirty pages.
7240 if (buf
->log_index
== 0)
7241 set_extent_dirty(&root
->dirty_log_pages
, buf
->start
,
7242 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7244 set_extent_new(&root
->dirty_log_pages
, buf
->start
,
7245 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7247 buf
->log_index
= -1;
7248 set_extent_dirty(&trans
->transaction
->dirty_pages
, buf
->start
,
7249 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
7251 trans
->blocks_used
++;
7252 /* this returns a buffer locked for blocking */
7256 static struct btrfs_block_rsv
*
7257 use_block_rsv(struct btrfs_trans_handle
*trans
,
7258 struct btrfs_root
*root
, u32 blocksize
)
7260 struct btrfs_block_rsv
*block_rsv
;
7261 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
7263 bool global_updated
= false;
7265 block_rsv
= get_block_rsv(trans
, root
);
7267 if (unlikely(block_rsv
->size
== 0))
7270 ret
= block_rsv_use_bytes(block_rsv
, blocksize
);
7274 if (block_rsv
->failfast
)
7275 return ERR_PTR(ret
);
7277 if (block_rsv
->type
== BTRFS_BLOCK_RSV_GLOBAL
&& !global_updated
) {
7278 global_updated
= true;
7279 update_global_block_rsv(root
->fs_info
);
7283 if (btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
7284 static DEFINE_RATELIMIT_STATE(_rs
,
7285 DEFAULT_RATELIMIT_INTERVAL
* 10,
7286 /*DEFAULT_RATELIMIT_BURST*/ 1);
7287 if (__ratelimit(&_rs
))
7289 "BTRFS: block rsv returned %d\n", ret
);
7292 ret
= reserve_metadata_bytes(root
, block_rsv
, blocksize
,
7293 BTRFS_RESERVE_NO_FLUSH
);
7297 * If we couldn't reserve metadata bytes try and use some from
7298 * the global reserve if its space type is the same as the global
7301 if (block_rsv
->type
!= BTRFS_BLOCK_RSV_GLOBAL
&&
7302 block_rsv
->space_info
== global_rsv
->space_info
) {
7303 ret
= block_rsv_use_bytes(global_rsv
, blocksize
);
7307 return ERR_PTR(ret
);
7310 static void unuse_block_rsv(struct btrfs_fs_info
*fs_info
,
7311 struct btrfs_block_rsv
*block_rsv
, u32 blocksize
)
7313 block_rsv_add_bytes(block_rsv
, blocksize
, 0);
7314 block_rsv_release_bytes(fs_info
, block_rsv
, NULL
, 0);
7318 * finds a free extent and does all the dirty work required for allocation
7319 * returns the key for the extent through ins, and a tree buffer for
7320 * the first block of the extent through buf.
7322 * returns the tree buffer or NULL.
7324 struct extent_buffer
*btrfs_alloc_tree_block(struct btrfs_trans_handle
*trans
,
7325 struct btrfs_root
*root
,
7326 u64 parent
, u64 root_objectid
,
7327 struct btrfs_disk_key
*key
, int level
,
7328 u64 hint
, u64 empty_size
)
7330 struct btrfs_key ins
;
7331 struct btrfs_block_rsv
*block_rsv
;
7332 struct extent_buffer
*buf
;
7335 u32 blocksize
= root
->nodesize
;
7336 bool skinny_metadata
= btrfs_fs_incompat(root
->fs_info
,
7339 if (btrfs_test_is_dummy_root(root
)) {
7340 buf
= btrfs_init_new_buffer(trans
, root
, root
->alloc_bytenr
,
7343 root
->alloc_bytenr
+= blocksize
;
7347 block_rsv
= use_block_rsv(trans
, root
, blocksize
);
7348 if (IS_ERR(block_rsv
))
7349 return ERR_CAST(block_rsv
);
7351 ret
= btrfs_reserve_extent(root
, blocksize
, blocksize
,
7352 empty_size
, hint
, &ins
, 0, 0);
7354 unuse_block_rsv(root
->fs_info
, block_rsv
, blocksize
);
7355 return ERR_PTR(ret
);
7358 buf
= btrfs_init_new_buffer(trans
, root
, ins
.objectid
,
7360 BUG_ON(IS_ERR(buf
)); /* -ENOMEM */
7362 if (root_objectid
== BTRFS_TREE_RELOC_OBJECTID
) {
7364 parent
= ins
.objectid
;
7365 flags
|= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
7369 if (root_objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
7370 struct btrfs_delayed_extent_op
*extent_op
;
7371 extent_op
= btrfs_alloc_delayed_extent_op();
7372 BUG_ON(!extent_op
); /* -ENOMEM */
7374 memcpy(&extent_op
->key
, key
, sizeof(extent_op
->key
));
7376 memset(&extent_op
->key
, 0, sizeof(extent_op
->key
));
7377 extent_op
->flags_to_set
= flags
;
7378 if (skinny_metadata
)
7379 extent_op
->update_key
= 0;
7381 extent_op
->update_key
= 1;
7382 extent_op
->update_flags
= 1;
7383 extent_op
->is_data
= 0;
7384 extent_op
->level
= level
;
7386 ret
= btrfs_add_delayed_tree_ref(root
->fs_info
, trans
,
7388 ins
.offset
, parent
, root_objectid
,
7389 level
, BTRFS_ADD_DELAYED_EXTENT
,
7391 BUG_ON(ret
); /* -ENOMEM */
7396 struct walk_control
{
7397 u64 refs
[BTRFS_MAX_LEVEL
];
7398 u64 flags
[BTRFS_MAX_LEVEL
];
7399 struct btrfs_key update_progress
;
7410 #define DROP_REFERENCE 1
7411 #define UPDATE_BACKREF 2
7413 static noinline
void reada_walk_down(struct btrfs_trans_handle
*trans
,
7414 struct btrfs_root
*root
,
7415 struct walk_control
*wc
,
7416 struct btrfs_path
*path
)
7424 struct btrfs_key key
;
7425 struct extent_buffer
*eb
;
7430 if (path
->slots
[wc
->level
] < wc
->reada_slot
) {
7431 wc
->reada_count
= wc
->reada_count
* 2 / 3;
7432 wc
->reada_count
= max(wc
->reada_count
, 2);
7434 wc
->reada_count
= wc
->reada_count
* 3 / 2;
7435 wc
->reada_count
= min_t(int, wc
->reada_count
,
7436 BTRFS_NODEPTRS_PER_BLOCK(root
));
7439 eb
= path
->nodes
[wc
->level
];
7440 nritems
= btrfs_header_nritems(eb
);
7441 blocksize
= root
->nodesize
;
7443 for (slot
= path
->slots
[wc
->level
]; slot
< nritems
; slot
++) {
7444 if (nread
>= wc
->reada_count
)
7448 bytenr
= btrfs_node_blockptr(eb
, slot
);
7449 generation
= btrfs_node_ptr_generation(eb
, slot
);
7451 if (slot
== path
->slots
[wc
->level
])
7454 if (wc
->stage
== UPDATE_BACKREF
&&
7455 generation
<= root
->root_key
.offset
)
7458 /* We don't lock the tree block, it's OK to be racy here */
7459 ret
= btrfs_lookup_extent_info(trans
, root
, bytenr
,
7460 wc
->level
- 1, 1, &refs
,
7462 /* We don't care about errors in readahead. */
7467 if (wc
->stage
== DROP_REFERENCE
) {
7471 if (wc
->level
== 1 &&
7472 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7474 if (!wc
->update_ref
||
7475 generation
<= root
->root_key
.offset
)
7477 btrfs_node_key_to_cpu(eb
, &key
, slot
);
7478 ret
= btrfs_comp_cpu_keys(&key
,
7479 &wc
->update_progress
);
7483 if (wc
->level
== 1 &&
7484 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7488 readahead_tree_block(root
, bytenr
);
7491 wc
->reada_slot
= slot
;
7494 static int account_leaf_items(struct btrfs_trans_handle
*trans
,
7495 struct btrfs_root
*root
,
7496 struct extent_buffer
*eb
)
7498 int nr
= btrfs_header_nritems(eb
);
7499 int i
, extent_type
, ret
;
7500 struct btrfs_key key
;
7501 struct btrfs_file_extent_item
*fi
;
7502 u64 bytenr
, num_bytes
;
7504 for (i
= 0; i
< nr
; i
++) {
7505 btrfs_item_key_to_cpu(eb
, &key
, i
);
7507 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
7510 fi
= btrfs_item_ptr(eb
, i
, struct btrfs_file_extent_item
);
7511 /* filter out non qgroup-accountable extents */
7512 extent_type
= btrfs_file_extent_type(eb
, fi
);
7514 if (extent_type
== BTRFS_FILE_EXTENT_INLINE
)
7517 bytenr
= btrfs_file_extent_disk_bytenr(eb
, fi
);
7521 num_bytes
= btrfs_file_extent_disk_num_bytes(eb
, fi
);
7523 ret
= btrfs_qgroup_record_ref(trans
, root
->fs_info
,
7526 BTRFS_QGROUP_OPER_SUB_SUBTREE
, 0);
7534 * Walk up the tree from the bottom, freeing leaves and any interior
7535 * nodes which have had all slots visited. If a node (leaf or
7536 * interior) is freed, the node above it will have it's slot
7537 * incremented. The root node will never be freed.
7539 * At the end of this function, we should have a path which has all
7540 * slots incremented to the next position for a search. If we need to
7541 * read a new node it will be NULL and the node above it will have the
7542 * correct slot selected for a later read.
7544 * If we increment the root nodes slot counter past the number of
7545 * elements, 1 is returned to signal completion of the search.
7547 static int adjust_slots_upwards(struct btrfs_root
*root
,
7548 struct btrfs_path
*path
, int root_level
)
7552 struct extent_buffer
*eb
;
7554 if (root_level
== 0)
7557 while (level
<= root_level
) {
7558 eb
= path
->nodes
[level
];
7559 nr
= btrfs_header_nritems(eb
);
7560 path
->slots
[level
]++;
7561 slot
= path
->slots
[level
];
7562 if (slot
>= nr
|| level
== 0) {
7564 * Don't free the root - we will detect this
7565 * condition after our loop and return a
7566 * positive value for caller to stop walking the tree.
7568 if (level
!= root_level
) {
7569 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7570 path
->locks
[level
] = 0;
7572 free_extent_buffer(eb
);
7573 path
->nodes
[level
] = NULL
;
7574 path
->slots
[level
] = 0;
7578 * We have a valid slot to walk back down
7579 * from. Stop here so caller can process these
7588 eb
= path
->nodes
[root_level
];
7589 if (path
->slots
[root_level
] >= btrfs_header_nritems(eb
))
7596 * root_eb is the subtree root and is locked before this function is called.
7598 static int account_shared_subtree(struct btrfs_trans_handle
*trans
,
7599 struct btrfs_root
*root
,
7600 struct extent_buffer
*root_eb
,
7606 struct extent_buffer
*eb
= root_eb
;
7607 struct btrfs_path
*path
= NULL
;
7609 BUG_ON(root_level
< 0 || root_level
> BTRFS_MAX_LEVEL
);
7610 BUG_ON(root_eb
== NULL
);
7612 if (!root
->fs_info
->quota_enabled
)
7615 if (!extent_buffer_uptodate(root_eb
)) {
7616 ret
= btrfs_read_buffer(root_eb
, root_gen
);
7621 if (root_level
== 0) {
7622 ret
= account_leaf_items(trans
, root
, root_eb
);
7626 path
= btrfs_alloc_path();
7631 * Walk down the tree. Missing extent blocks are filled in as
7632 * we go. Metadata is accounted every time we read a new
7635 * When we reach a leaf, we account for file extent items in it,
7636 * walk back up the tree (adjusting slot pointers as we go)
7637 * and restart the search process.
7639 extent_buffer_get(root_eb
); /* For path */
7640 path
->nodes
[root_level
] = root_eb
;
7641 path
->slots
[root_level
] = 0;
7642 path
->locks
[root_level
] = 0; /* so release_path doesn't try to unlock */
7645 while (level
>= 0) {
7646 if (path
->nodes
[level
] == NULL
) {
7651 /* We need to get child blockptr/gen from
7652 * parent before we can read it. */
7653 eb
= path
->nodes
[level
+ 1];
7654 parent_slot
= path
->slots
[level
+ 1];
7655 child_bytenr
= btrfs_node_blockptr(eb
, parent_slot
);
7656 child_gen
= btrfs_node_ptr_generation(eb
, parent_slot
);
7658 eb
= read_tree_block(root
, child_bytenr
, child_gen
);
7659 if (!eb
|| !extent_buffer_uptodate(eb
)) {
7664 path
->nodes
[level
] = eb
;
7665 path
->slots
[level
] = 0;
7667 btrfs_tree_read_lock(eb
);
7668 btrfs_set_lock_blocking_rw(eb
, BTRFS_READ_LOCK
);
7669 path
->locks
[level
] = BTRFS_READ_LOCK_BLOCKING
;
7671 ret
= btrfs_qgroup_record_ref(trans
, root
->fs_info
,
7675 BTRFS_QGROUP_OPER_SUB_SUBTREE
,
7683 ret
= account_leaf_items(trans
, root
, path
->nodes
[level
]);
7687 /* Nonzero return here means we completed our search */
7688 ret
= adjust_slots_upwards(root
, path
, root_level
);
7692 /* Restart search with new slots */
7701 btrfs_free_path(path
);
7707 * helper to process tree block while walking down the tree.
7709 * when wc->stage == UPDATE_BACKREF, this function updates
7710 * back refs for pointers in the block.
7712 * NOTE: return value 1 means we should stop walking down.
7714 static noinline
int walk_down_proc(struct btrfs_trans_handle
*trans
,
7715 struct btrfs_root
*root
,
7716 struct btrfs_path
*path
,
7717 struct walk_control
*wc
, int lookup_info
)
7719 int level
= wc
->level
;
7720 struct extent_buffer
*eb
= path
->nodes
[level
];
7721 u64 flag
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
7724 if (wc
->stage
== UPDATE_BACKREF
&&
7725 btrfs_header_owner(eb
) != root
->root_key
.objectid
)
7729 * when reference count of tree block is 1, it won't increase
7730 * again. once full backref flag is set, we never clear it.
7733 ((wc
->stage
== DROP_REFERENCE
&& wc
->refs
[level
] != 1) ||
7734 (wc
->stage
== UPDATE_BACKREF
&& !(wc
->flags
[level
] & flag
)))) {
7735 BUG_ON(!path
->locks
[level
]);
7736 ret
= btrfs_lookup_extent_info(trans
, root
,
7737 eb
->start
, level
, 1,
7740 BUG_ON(ret
== -ENOMEM
);
7743 BUG_ON(wc
->refs
[level
] == 0);
7746 if (wc
->stage
== DROP_REFERENCE
) {
7747 if (wc
->refs
[level
] > 1)
7750 if (path
->locks
[level
] && !wc
->keep_locks
) {
7751 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7752 path
->locks
[level
] = 0;
7757 /* wc->stage == UPDATE_BACKREF */
7758 if (!(wc
->flags
[level
] & flag
)) {
7759 BUG_ON(!path
->locks
[level
]);
7760 ret
= btrfs_inc_ref(trans
, root
, eb
, 1);
7761 BUG_ON(ret
); /* -ENOMEM */
7762 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
7763 BUG_ON(ret
); /* -ENOMEM */
7764 ret
= btrfs_set_disk_extent_flags(trans
, root
, eb
->start
,
7766 btrfs_header_level(eb
), 0);
7767 BUG_ON(ret
); /* -ENOMEM */
7768 wc
->flags
[level
] |= flag
;
7772 * the block is shared by multiple trees, so it's not good to
7773 * keep the tree lock
7775 if (path
->locks
[level
] && level
> 0) {
7776 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7777 path
->locks
[level
] = 0;
7783 * helper to process tree block pointer.
7785 * when wc->stage == DROP_REFERENCE, this function checks
7786 * reference count of the block pointed to. if the block
7787 * is shared and we need update back refs for the subtree
7788 * rooted at the block, this function changes wc->stage to
7789 * UPDATE_BACKREF. if the block is shared and there is no
7790 * need to update back, this function drops the reference
7793 * NOTE: return value 1 means we should stop walking down.
7795 static noinline
int do_walk_down(struct btrfs_trans_handle
*trans
,
7796 struct btrfs_root
*root
,
7797 struct btrfs_path
*path
,
7798 struct walk_control
*wc
, int *lookup_info
)
7804 struct btrfs_key key
;
7805 struct extent_buffer
*next
;
7806 int level
= wc
->level
;
7809 bool need_account
= false;
7811 generation
= btrfs_node_ptr_generation(path
->nodes
[level
],
7812 path
->slots
[level
]);
7814 * if the lower level block was created before the snapshot
7815 * was created, we know there is no need to update back refs
7818 if (wc
->stage
== UPDATE_BACKREF
&&
7819 generation
<= root
->root_key
.offset
) {
7824 bytenr
= btrfs_node_blockptr(path
->nodes
[level
], path
->slots
[level
]);
7825 blocksize
= root
->nodesize
;
7827 next
= btrfs_find_tree_block(root
, bytenr
);
7829 next
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
7832 btrfs_set_buffer_lockdep_class(root
->root_key
.objectid
, next
,
7836 btrfs_tree_lock(next
);
7837 btrfs_set_lock_blocking(next
);
7839 ret
= btrfs_lookup_extent_info(trans
, root
, bytenr
, level
- 1, 1,
7840 &wc
->refs
[level
- 1],
7841 &wc
->flags
[level
- 1]);
7843 btrfs_tree_unlock(next
);
7847 if (unlikely(wc
->refs
[level
- 1] == 0)) {
7848 btrfs_err(root
->fs_info
, "Missing references.");
7853 if (wc
->stage
== DROP_REFERENCE
) {
7854 if (wc
->refs
[level
- 1] > 1) {
7855 need_account
= true;
7857 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7860 if (!wc
->update_ref
||
7861 generation
<= root
->root_key
.offset
)
7864 btrfs_node_key_to_cpu(path
->nodes
[level
], &key
,
7865 path
->slots
[level
]);
7866 ret
= btrfs_comp_cpu_keys(&key
, &wc
->update_progress
);
7870 wc
->stage
= UPDATE_BACKREF
;
7871 wc
->shared_level
= level
- 1;
7875 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
7879 if (!btrfs_buffer_uptodate(next
, generation
, 0)) {
7880 btrfs_tree_unlock(next
);
7881 free_extent_buffer(next
);
7887 if (reada
&& level
== 1)
7888 reada_walk_down(trans
, root
, wc
, path
);
7889 next
= read_tree_block(root
, bytenr
, generation
);
7890 if (!next
|| !extent_buffer_uptodate(next
)) {
7891 free_extent_buffer(next
);
7894 btrfs_tree_lock(next
);
7895 btrfs_set_lock_blocking(next
);
7899 BUG_ON(level
!= btrfs_header_level(next
));
7900 path
->nodes
[level
] = next
;
7901 path
->slots
[level
] = 0;
7902 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
7908 wc
->refs
[level
- 1] = 0;
7909 wc
->flags
[level
- 1] = 0;
7910 if (wc
->stage
== DROP_REFERENCE
) {
7911 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
) {
7912 parent
= path
->nodes
[level
]->start
;
7914 BUG_ON(root
->root_key
.objectid
!=
7915 btrfs_header_owner(path
->nodes
[level
]));
7920 ret
= account_shared_subtree(trans
, root
, next
,
7921 generation
, level
- 1);
7923 printk_ratelimited(KERN_ERR
"BTRFS: %s Error "
7924 "%d accounting shared subtree. Quota "
7925 "is out of sync, rescan required.\n",
7926 root
->fs_info
->sb
->s_id
, ret
);
7929 ret
= btrfs_free_extent(trans
, root
, bytenr
, blocksize
, parent
,
7930 root
->root_key
.objectid
, level
- 1, 0, 0);
7931 BUG_ON(ret
); /* -ENOMEM */
7933 btrfs_tree_unlock(next
);
7934 free_extent_buffer(next
);
7940 * helper to process tree block while walking up the tree.
7942 * when wc->stage == DROP_REFERENCE, this function drops
7943 * reference count on the block.
7945 * when wc->stage == UPDATE_BACKREF, this function changes
7946 * wc->stage back to DROP_REFERENCE if we changed wc->stage
7947 * to UPDATE_BACKREF previously while processing the block.
7949 * NOTE: return value 1 means we should stop walking up.
7951 static noinline
int walk_up_proc(struct btrfs_trans_handle
*trans
,
7952 struct btrfs_root
*root
,
7953 struct btrfs_path
*path
,
7954 struct walk_control
*wc
)
7957 int level
= wc
->level
;
7958 struct extent_buffer
*eb
= path
->nodes
[level
];
7961 if (wc
->stage
== UPDATE_BACKREF
) {
7962 BUG_ON(wc
->shared_level
< level
);
7963 if (level
< wc
->shared_level
)
7966 ret
= find_next_key(path
, level
+ 1, &wc
->update_progress
);
7970 wc
->stage
= DROP_REFERENCE
;
7971 wc
->shared_level
= -1;
7972 path
->slots
[level
] = 0;
7975 * check reference count again if the block isn't locked.
7976 * we should start walking down the tree again if reference
7979 if (!path
->locks
[level
]) {
7981 btrfs_tree_lock(eb
);
7982 btrfs_set_lock_blocking(eb
);
7983 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
7985 ret
= btrfs_lookup_extent_info(trans
, root
,
7986 eb
->start
, level
, 1,
7990 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7991 path
->locks
[level
] = 0;
7994 BUG_ON(wc
->refs
[level
] == 0);
7995 if (wc
->refs
[level
] == 1) {
7996 btrfs_tree_unlock_rw(eb
, path
->locks
[level
]);
7997 path
->locks
[level
] = 0;
8003 /* wc->stage == DROP_REFERENCE */
8004 BUG_ON(wc
->refs
[level
] > 1 && !path
->locks
[level
]);
8006 if (wc
->refs
[level
] == 1) {
8008 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8009 ret
= btrfs_dec_ref(trans
, root
, eb
, 1);
8011 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
8012 BUG_ON(ret
); /* -ENOMEM */
8013 ret
= account_leaf_items(trans
, root
, eb
);
8015 printk_ratelimited(KERN_ERR
"BTRFS: %s Error "
8016 "%d accounting leaf items. Quota "
8017 "is out of sync, rescan required.\n",
8018 root
->fs_info
->sb
->s_id
, ret
);
8021 /* make block locked assertion in clean_tree_block happy */
8022 if (!path
->locks
[level
] &&
8023 btrfs_header_generation(eb
) == trans
->transid
) {
8024 btrfs_tree_lock(eb
);
8025 btrfs_set_lock_blocking(eb
);
8026 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8028 clean_tree_block(trans
, root
, eb
);
8031 if (eb
== root
->node
) {
8032 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8035 BUG_ON(root
->root_key
.objectid
!=
8036 btrfs_header_owner(eb
));
8038 if (wc
->flags
[level
+ 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
8039 parent
= path
->nodes
[level
+ 1]->start
;
8041 BUG_ON(root
->root_key
.objectid
!=
8042 btrfs_header_owner(path
->nodes
[level
+ 1]));
8045 btrfs_free_tree_block(trans
, root
, eb
, parent
, wc
->refs
[level
] == 1);
8047 wc
->refs
[level
] = 0;
8048 wc
->flags
[level
] = 0;
8052 static noinline
int walk_down_tree(struct btrfs_trans_handle
*trans
,
8053 struct btrfs_root
*root
,
8054 struct btrfs_path
*path
,
8055 struct walk_control
*wc
)
8057 int level
= wc
->level
;
8058 int lookup_info
= 1;
8061 while (level
>= 0) {
8062 ret
= walk_down_proc(trans
, root
, path
, wc
, lookup_info
);
8069 if (path
->slots
[level
] >=
8070 btrfs_header_nritems(path
->nodes
[level
]))
8073 ret
= do_walk_down(trans
, root
, path
, wc
, &lookup_info
);
8075 path
->slots
[level
]++;
8084 static noinline
int walk_up_tree(struct btrfs_trans_handle
*trans
,
8085 struct btrfs_root
*root
,
8086 struct btrfs_path
*path
,
8087 struct walk_control
*wc
, int max_level
)
8089 int level
= wc
->level
;
8092 path
->slots
[level
] = btrfs_header_nritems(path
->nodes
[level
]);
8093 while (level
< max_level
&& path
->nodes
[level
]) {
8095 if (path
->slots
[level
] + 1 <
8096 btrfs_header_nritems(path
->nodes
[level
])) {
8097 path
->slots
[level
]++;
8100 ret
= walk_up_proc(trans
, root
, path
, wc
);
8104 if (path
->locks
[level
]) {
8105 btrfs_tree_unlock_rw(path
->nodes
[level
],
8106 path
->locks
[level
]);
8107 path
->locks
[level
] = 0;
8109 free_extent_buffer(path
->nodes
[level
]);
8110 path
->nodes
[level
] = NULL
;
8118 * drop a subvolume tree.
8120 * this function traverses the tree freeing any blocks that only
8121 * referenced by the tree.
8123 * when a shared tree block is found. this function decreases its
8124 * reference count by one. if update_ref is true, this function
8125 * also make sure backrefs for the shared block and all lower level
8126 * blocks are properly updated.
8128 * If called with for_reloc == 0, may exit early with -EAGAIN
8130 int btrfs_drop_snapshot(struct btrfs_root
*root
,
8131 struct btrfs_block_rsv
*block_rsv
, int update_ref
,
8134 struct btrfs_path
*path
;
8135 struct btrfs_trans_handle
*trans
;
8136 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
8137 struct btrfs_root_item
*root_item
= &root
->root_item
;
8138 struct walk_control
*wc
;
8139 struct btrfs_key key
;
8143 bool root_dropped
= false;
8145 btrfs_debug(root
->fs_info
, "Drop subvolume %llu", root
->objectid
);
8147 path
= btrfs_alloc_path();
8153 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
8155 btrfs_free_path(path
);
8160 trans
= btrfs_start_transaction(tree_root
, 0);
8161 if (IS_ERR(trans
)) {
8162 err
= PTR_ERR(trans
);
8167 trans
->block_rsv
= block_rsv
;
8169 if (btrfs_disk_key_objectid(&root_item
->drop_progress
) == 0) {
8170 level
= btrfs_header_level(root
->node
);
8171 path
->nodes
[level
] = btrfs_lock_root_node(root
);
8172 btrfs_set_lock_blocking(path
->nodes
[level
]);
8173 path
->slots
[level
] = 0;
8174 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8175 memset(&wc
->update_progress
, 0,
8176 sizeof(wc
->update_progress
));
8178 btrfs_disk_key_to_cpu(&key
, &root_item
->drop_progress
);
8179 memcpy(&wc
->update_progress
, &key
,
8180 sizeof(wc
->update_progress
));
8182 level
= root_item
->drop_level
;
8184 path
->lowest_level
= level
;
8185 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
8186 path
->lowest_level
= 0;
8194 * unlock our path, this is safe because only this
8195 * function is allowed to delete this snapshot
8197 btrfs_unlock_up_safe(path
, 0);
8199 level
= btrfs_header_level(root
->node
);
8201 btrfs_tree_lock(path
->nodes
[level
]);
8202 btrfs_set_lock_blocking(path
->nodes
[level
]);
8203 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8205 ret
= btrfs_lookup_extent_info(trans
, root
,
8206 path
->nodes
[level
]->start
,
8207 level
, 1, &wc
->refs
[level
],
8213 BUG_ON(wc
->refs
[level
] == 0);
8215 if (level
== root_item
->drop_level
)
8218 btrfs_tree_unlock(path
->nodes
[level
]);
8219 path
->locks
[level
] = 0;
8220 WARN_ON(wc
->refs
[level
] != 1);
8226 wc
->shared_level
= -1;
8227 wc
->stage
= DROP_REFERENCE
;
8228 wc
->update_ref
= update_ref
;
8230 wc
->for_reloc
= for_reloc
;
8231 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(root
);
8235 ret
= walk_down_tree(trans
, root
, path
, wc
);
8241 ret
= walk_up_tree(trans
, root
, path
, wc
, BTRFS_MAX_LEVEL
);
8248 BUG_ON(wc
->stage
!= DROP_REFERENCE
);
8252 if (wc
->stage
== DROP_REFERENCE
) {
8254 btrfs_node_key(path
->nodes
[level
],
8255 &root_item
->drop_progress
,
8256 path
->slots
[level
]);
8257 root_item
->drop_level
= level
;
8260 BUG_ON(wc
->level
== 0);
8261 if (btrfs_should_end_transaction(trans
, tree_root
) ||
8262 (!for_reloc
&& btrfs_need_cleaner_sleep(root
))) {
8263 ret
= btrfs_update_root(trans
, tree_root
,
8267 btrfs_abort_transaction(trans
, tree_root
, ret
);
8273 * Qgroup update accounting is run from
8274 * delayed ref handling. This usually works
8275 * out because delayed refs are normally the
8276 * only way qgroup updates are added. However,
8277 * we may have added updates during our tree
8278 * walk so run qgroups here to make sure we
8279 * don't lose any updates.
8281 ret
= btrfs_delayed_qgroup_accounting(trans
,
8284 printk_ratelimited(KERN_ERR
"BTRFS: Failure %d "
8285 "running qgroup updates "
8286 "during snapshot delete. "
8287 "Quota is out of sync, "
8288 "rescan required.\n", ret
);
8290 btrfs_end_transaction_throttle(trans
, tree_root
);
8291 if (!for_reloc
&& btrfs_need_cleaner_sleep(root
)) {
8292 pr_debug("BTRFS: drop snapshot early exit\n");
8297 trans
= btrfs_start_transaction(tree_root
, 0);
8298 if (IS_ERR(trans
)) {
8299 err
= PTR_ERR(trans
);
8303 trans
->block_rsv
= block_rsv
;
8306 btrfs_release_path(path
);
8310 ret
= btrfs_del_root(trans
, tree_root
, &root
->root_key
);
8312 btrfs_abort_transaction(trans
, tree_root
, ret
);
8316 if (root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
) {
8317 ret
= btrfs_find_root(tree_root
, &root
->root_key
, path
,
8320 btrfs_abort_transaction(trans
, tree_root
, ret
);
8323 } else if (ret
> 0) {
8324 /* if we fail to delete the orphan item this time
8325 * around, it'll get picked up the next time.
8327 * The most common failure here is just -ENOENT.
8329 btrfs_del_orphan_item(trans
, tree_root
,
8330 root
->root_key
.objectid
);
8334 if (test_bit(BTRFS_ROOT_IN_RADIX
, &root
->state
)) {
8335 btrfs_drop_and_free_fs_root(tree_root
->fs_info
, root
);
8337 free_extent_buffer(root
->node
);
8338 free_extent_buffer(root
->commit_root
);
8339 btrfs_put_fs_root(root
);
8341 root_dropped
= true;
8343 ret
= btrfs_delayed_qgroup_accounting(trans
, tree_root
->fs_info
);
8345 printk_ratelimited(KERN_ERR
"BTRFS: Failure %d "
8346 "running qgroup updates "
8347 "during snapshot delete. "
8348 "Quota is out of sync, "
8349 "rescan required.\n", ret
);
8351 btrfs_end_transaction_throttle(trans
, tree_root
);
8354 btrfs_free_path(path
);
8357 * So if we need to stop dropping the snapshot for whatever reason we
8358 * need to make sure to add it back to the dead root list so that we
8359 * keep trying to do the work later. This also cleans up roots if we
8360 * don't have it in the radix (like when we recover after a power fail
8361 * or unmount) so we don't leak memory.
8363 if (!for_reloc
&& root_dropped
== false)
8364 btrfs_add_dead_root(root
);
8365 if (err
&& err
!= -EAGAIN
)
8366 btrfs_std_error(root
->fs_info
, err
);
8371 * drop subtree rooted at tree block 'node'.
8373 * NOTE: this function will unlock and release tree block 'node'
8374 * only used by relocation code
8376 int btrfs_drop_subtree(struct btrfs_trans_handle
*trans
,
8377 struct btrfs_root
*root
,
8378 struct extent_buffer
*node
,
8379 struct extent_buffer
*parent
)
8381 struct btrfs_path
*path
;
8382 struct walk_control
*wc
;
8388 BUG_ON(root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
);
8390 path
= btrfs_alloc_path();
8394 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
8396 btrfs_free_path(path
);
8400 btrfs_assert_tree_locked(parent
);
8401 parent_level
= btrfs_header_level(parent
);
8402 extent_buffer_get(parent
);
8403 path
->nodes
[parent_level
] = parent
;
8404 path
->slots
[parent_level
] = btrfs_header_nritems(parent
);
8406 btrfs_assert_tree_locked(node
);
8407 level
= btrfs_header_level(node
);
8408 path
->nodes
[level
] = node
;
8409 path
->slots
[level
] = 0;
8410 path
->locks
[level
] = BTRFS_WRITE_LOCK_BLOCKING
;
8412 wc
->refs
[parent_level
] = 1;
8413 wc
->flags
[parent_level
] = BTRFS_BLOCK_FLAG_FULL_BACKREF
;
8415 wc
->shared_level
= -1;
8416 wc
->stage
= DROP_REFERENCE
;
8420 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(root
);
8423 wret
= walk_down_tree(trans
, root
, path
, wc
);
8429 wret
= walk_up_tree(trans
, root
, path
, wc
, parent_level
);
8437 btrfs_free_path(path
);
8441 static u64
update_block_group_flags(struct btrfs_root
*root
, u64 flags
)
8447 * if restripe for this chunk_type is on pick target profile and
8448 * return, otherwise do the usual balance
8450 stripped
= get_restripe_target(root
->fs_info
, flags
);
8452 return extended_to_chunk(stripped
);
8454 num_devices
= root
->fs_info
->fs_devices
->rw_devices
;
8456 stripped
= BTRFS_BLOCK_GROUP_RAID0
|
8457 BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
|
8458 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID10
;
8460 if (num_devices
== 1) {
8461 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
8462 stripped
= flags
& ~stripped
;
8464 /* turn raid0 into single device chunks */
8465 if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
8468 /* turn mirroring into duplication */
8469 if (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
8470 BTRFS_BLOCK_GROUP_RAID10
))
8471 return stripped
| BTRFS_BLOCK_GROUP_DUP
;
8473 /* they already had raid on here, just return */
8474 if (flags
& stripped
)
8477 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
8478 stripped
= flags
& ~stripped
;
8480 /* switch duplicated blocks with raid1 */
8481 if (flags
& BTRFS_BLOCK_GROUP_DUP
)
8482 return stripped
| BTRFS_BLOCK_GROUP_RAID1
;
8484 /* this is drive concat, leave it alone */
8490 static int set_block_group_ro(struct btrfs_block_group_cache
*cache
, int force
)
8492 struct btrfs_space_info
*sinfo
= cache
->space_info
;
8494 u64 min_allocable_bytes
;
8499 * We need some metadata space and system metadata space for
8500 * allocating chunks in some corner cases until we force to set
8501 * it to be readonly.
8504 (BTRFS_BLOCK_GROUP_SYSTEM
| BTRFS_BLOCK_GROUP_METADATA
)) &&
8506 min_allocable_bytes
= 1 * 1024 * 1024;
8508 min_allocable_bytes
= 0;
8510 spin_lock(&sinfo
->lock
);
8511 spin_lock(&cache
->lock
);
8518 num_bytes
= cache
->key
.offset
- cache
->reserved
- cache
->pinned
-
8519 cache
->bytes_super
- btrfs_block_group_used(&cache
->item
);
8521 if (sinfo
->bytes_used
+ sinfo
->bytes_reserved
+ sinfo
->bytes_pinned
+
8522 sinfo
->bytes_may_use
+ sinfo
->bytes_readonly
+ num_bytes
+
8523 min_allocable_bytes
<= sinfo
->total_bytes
) {
8524 sinfo
->bytes_readonly
+= num_bytes
;
8526 list_add_tail(&cache
->ro_list
, &sinfo
->ro_bgs
);
8530 spin_unlock(&cache
->lock
);
8531 spin_unlock(&sinfo
->lock
);
8535 int btrfs_set_block_group_ro(struct btrfs_root
*root
,
8536 struct btrfs_block_group_cache
*cache
)
8539 struct btrfs_trans_handle
*trans
;
8545 trans
= btrfs_join_transaction(root
);
8547 return PTR_ERR(trans
);
8549 alloc_flags
= update_block_group_flags(root
, cache
->flags
);
8550 if (alloc_flags
!= cache
->flags
) {
8551 ret
= do_chunk_alloc(trans
, root
, alloc_flags
,
8557 ret
= set_block_group_ro(cache
, 0);
8560 alloc_flags
= get_alloc_profile(root
, cache
->space_info
->flags
);
8561 ret
= do_chunk_alloc(trans
, root
, alloc_flags
,
8565 ret
= set_block_group_ro(cache
, 0);
8567 btrfs_end_transaction(trans
, root
);
8571 int btrfs_force_chunk_alloc(struct btrfs_trans_handle
*trans
,
8572 struct btrfs_root
*root
, u64 type
)
8574 u64 alloc_flags
= get_alloc_profile(root
, type
);
8575 return do_chunk_alloc(trans
, root
, alloc_flags
,
8580 * helper to account the unused space of all the readonly block group in the
8581 * space_info. takes mirrors into account.
8583 u64
btrfs_account_ro_block_groups_free_space(struct btrfs_space_info
*sinfo
)
8585 struct btrfs_block_group_cache
*block_group
;
8589 /* It's df, we don't care if it's racey */
8590 if (list_empty(&sinfo
->ro_bgs
))
8593 spin_lock(&sinfo
->lock
);
8594 list_for_each_entry(block_group
, &sinfo
->ro_bgs
, ro_list
) {
8595 spin_lock(&block_group
->lock
);
8597 if (!block_group
->ro
) {
8598 spin_unlock(&block_group
->lock
);
8602 if (block_group
->flags
& (BTRFS_BLOCK_GROUP_RAID1
|
8603 BTRFS_BLOCK_GROUP_RAID10
|
8604 BTRFS_BLOCK_GROUP_DUP
))
8609 free_bytes
+= (block_group
->key
.offset
-
8610 btrfs_block_group_used(&block_group
->item
)) *
8613 spin_unlock(&block_group
->lock
);
8615 spin_unlock(&sinfo
->lock
);
8620 void btrfs_set_block_group_rw(struct btrfs_root
*root
,
8621 struct btrfs_block_group_cache
*cache
)
8623 struct btrfs_space_info
*sinfo
= cache
->space_info
;
8628 spin_lock(&sinfo
->lock
);
8629 spin_lock(&cache
->lock
);
8630 num_bytes
= cache
->key
.offset
- cache
->reserved
- cache
->pinned
-
8631 cache
->bytes_super
- btrfs_block_group_used(&cache
->item
);
8632 sinfo
->bytes_readonly
-= num_bytes
;
8634 list_del_init(&cache
->ro_list
);
8635 spin_unlock(&cache
->lock
);
8636 spin_unlock(&sinfo
->lock
);
8640 * checks to see if its even possible to relocate this block group.
8642 * @return - -1 if it's not a good idea to relocate this block group, 0 if its
8643 * ok to go ahead and try.
8645 int btrfs_can_relocate(struct btrfs_root
*root
, u64 bytenr
)
8647 struct btrfs_block_group_cache
*block_group
;
8648 struct btrfs_space_info
*space_info
;
8649 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
8650 struct btrfs_device
*device
;
8651 struct btrfs_trans_handle
*trans
;
8660 block_group
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
8662 /* odd, couldn't find the block group, leave it alone */
8666 min_free
= btrfs_block_group_used(&block_group
->item
);
8668 /* no bytes used, we're good */
8672 space_info
= block_group
->space_info
;
8673 spin_lock(&space_info
->lock
);
8675 full
= space_info
->full
;
8678 * if this is the last block group we have in this space, we can't
8679 * relocate it unless we're able to allocate a new chunk below.
8681 * Otherwise, we need to make sure we have room in the space to handle
8682 * all of the extents from this block group. If we can, we're good
8684 if ((space_info
->total_bytes
!= block_group
->key
.offset
) &&
8685 (space_info
->bytes_used
+ space_info
->bytes_reserved
+
8686 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
8687 min_free
< space_info
->total_bytes
)) {
8688 spin_unlock(&space_info
->lock
);
8691 spin_unlock(&space_info
->lock
);
8694 * ok we don't have enough space, but maybe we have free space on our
8695 * devices to allocate new chunks for relocation, so loop through our
8696 * alloc devices and guess if we have enough space. if this block
8697 * group is going to be restriped, run checks against the target
8698 * profile instead of the current one.
8710 target
= get_restripe_target(root
->fs_info
, block_group
->flags
);
8712 index
= __get_raid_index(extended_to_chunk(target
));
8715 * this is just a balance, so if we were marked as full
8716 * we know there is no space for a new chunk
8721 index
= get_block_group_index(block_group
);
8724 if (index
== BTRFS_RAID_RAID10
) {
8728 } else if (index
== BTRFS_RAID_RAID1
) {
8730 } else if (index
== BTRFS_RAID_DUP
) {
8733 } else if (index
== BTRFS_RAID_RAID0
) {
8734 dev_min
= fs_devices
->rw_devices
;
8735 do_div(min_free
, dev_min
);
8738 /* We need to do this so that we can look at pending chunks */
8739 trans
= btrfs_join_transaction(root
);
8740 if (IS_ERR(trans
)) {
8741 ret
= PTR_ERR(trans
);
8745 mutex_lock(&root
->fs_info
->chunk_mutex
);
8746 list_for_each_entry(device
, &fs_devices
->alloc_list
, dev_alloc_list
) {
8750 * check to make sure we can actually find a chunk with enough
8751 * space to fit our block group in.
8753 if (device
->total_bytes
> device
->bytes_used
+ min_free
&&
8754 !device
->is_tgtdev_for_dev_replace
) {
8755 ret
= find_free_dev_extent(trans
, device
, min_free
,
8760 if (dev_nr
>= dev_min
)
8766 mutex_unlock(&root
->fs_info
->chunk_mutex
);
8767 btrfs_end_transaction(trans
, root
);
8769 btrfs_put_block_group(block_group
);
8773 static int find_first_block_group(struct btrfs_root
*root
,
8774 struct btrfs_path
*path
, struct btrfs_key
*key
)
8777 struct btrfs_key found_key
;
8778 struct extent_buffer
*leaf
;
8781 ret
= btrfs_search_slot(NULL
, root
, key
, path
, 0, 0);
8786 slot
= path
->slots
[0];
8787 leaf
= path
->nodes
[0];
8788 if (slot
>= btrfs_header_nritems(leaf
)) {
8789 ret
= btrfs_next_leaf(root
, path
);
8796 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
8798 if (found_key
.objectid
>= key
->objectid
&&
8799 found_key
.type
== BTRFS_BLOCK_GROUP_ITEM_KEY
) {
8809 void btrfs_put_block_group_cache(struct btrfs_fs_info
*info
)
8811 struct btrfs_block_group_cache
*block_group
;
8815 struct inode
*inode
;
8817 block_group
= btrfs_lookup_first_block_group(info
, last
);
8818 while (block_group
) {
8819 spin_lock(&block_group
->lock
);
8820 if (block_group
->iref
)
8822 spin_unlock(&block_group
->lock
);
8823 block_group
= next_block_group(info
->tree_root
,
8833 inode
= block_group
->inode
;
8834 block_group
->iref
= 0;
8835 block_group
->inode
= NULL
;
8836 spin_unlock(&block_group
->lock
);
8838 last
= block_group
->key
.objectid
+ block_group
->key
.offset
;
8839 btrfs_put_block_group(block_group
);
8843 int btrfs_free_block_groups(struct btrfs_fs_info
*info
)
8845 struct btrfs_block_group_cache
*block_group
;
8846 struct btrfs_space_info
*space_info
;
8847 struct btrfs_caching_control
*caching_ctl
;
8850 down_write(&info
->commit_root_sem
);
8851 while (!list_empty(&info
->caching_block_groups
)) {
8852 caching_ctl
= list_entry(info
->caching_block_groups
.next
,
8853 struct btrfs_caching_control
, list
);
8854 list_del(&caching_ctl
->list
);
8855 put_caching_control(caching_ctl
);
8857 up_write(&info
->commit_root_sem
);
8859 spin_lock(&info
->unused_bgs_lock
);
8860 while (!list_empty(&info
->unused_bgs
)) {
8861 block_group
= list_first_entry(&info
->unused_bgs
,
8862 struct btrfs_block_group_cache
,
8864 list_del_init(&block_group
->bg_list
);
8865 btrfs_put_block_group(block_group
);
8867 spin_unlock(&info
->unused_bgs_lock
);
8869 spin_lock(&info
->block_group_cache_lock
);
8870 while ((n
= rb_last(&info
->block_group_cache_tree
)) != NULL
) {
8871 block_group
= rb_entry(n
, struct btrfs_block_group_cache
,
8873 rb_erase(&block_group
->cache_node
,
8874 &info
->block_group_cache_tree
);
8875 spin_unlock(&info
->block_group_cache_lock
);
8877 down_write(&block_group
->space_info
->groups_sem
);
8878 list_del(&block_group
->list
);
8879 up_write(&block_group
->space_info
->groups_sem
);
8881 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
8882 wait_block_group_cache_done(block_group
);
8885 * We haven't cached this block group, which means we could
8886 * possibly have excluded extents on this block group.
8888 if (block_group
->cached
== BTRFS_CACHE_NO
||
8889 block_group
->cached
== BTRFS_CACHE_ERROR
)
8890 free_excluded_extents(info
->extent_root
, block_group
);
8892 btrfs_remove_free_space_cache(block_group
);
8893 btrfs_put_block_group(block_group
);
8895 spin_lock(&info
->block_group_cache_lock
);
8897 spin_unlock(&info
->block_group_cache_lock
);
8899 /* now that all the block groups are freed, go through and
8900 * free all the space_info structs. This is only called during
8901 * the final stages of unmount, and so we know nobody is
8902 * using them. We call synchronize_rcu() once before we start,
8903 * just to be on the safe side.
8907 release_global_block_rsv(info
);
8909 while (!list_empty(&info
->space_info
)) {
8912 space_info
= list_entry(info
->space_info
.next
,
8913 struct btrfs_space_info
,
8915 if (btrfs_test_opt(info
->tree_root
, ENOSPC_DEBUG
)) {
8916 if (WARN_ON(space_info
->bytes_pinned
> 0 ||
8917 space_info
->bytes_reserved
> 0 ||
8918 space_info
->bytes_may_use
> 0)) {
8919 dump_space_info(space_info
, 0, 0);
8922 list_del(&space_info
->list
);
8923 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++) {
8924 struct kobject
*kobj
;
8925 kobj
= space_info
->block_group_kobjs
[i
];
8926 space_info
->block_group_kobjs
[i
] = NULL
;
8932 kobject_del(&space_info
->kobj
);
8933 kobject_put(&space_info
->kobj
);
8938 static void __link_block_group(struct btrfs_space_info
*space_info
,
8939 struct btrfs_block_group_cache
*cache
)
8941 int index
= get_block_group_index(cache
);
8944 down_write(&space_info
->groups_sem
);
8945 if (list_empty(&space_info
->block_groups
[index
]))
8947 list_add_tail(&cache
->list
, &space_info
->block_groups
[index
]);
8948 up_write(&space_info
->groups_sem
);
8951 struct raid_kobject
*rkobj
;
8954 rkobj
= kzalloc(sizeof(*rkobj
), GFP_NOFS
);
8957 rkobj
->raid_type
= index
;
8958 kobject_init(&rkobj
->kobj
, &btrfs_raid_ktype
);
8959 ret
= kobject_add(&rkobj
->kobj
, &space_info
->kobj
,
8960 "%s", get_raid_name(index
));
8962 kobject_put(&rkobj
->kobj
);
8965 space_info
->block_group_kobjs
[index
] = &rkobj
->kobj
;
8970 pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n");
8973 static struct btrfs_block_group_cache
*
8974 btrfs_create_block_group_cache(struct btrfs_root
*root
, u64 start
, u64 size
)
8976 struct btrfs_block_group_cache
*cache
;
8978 cache
= kzalloc(sizeof(*cache
), GFP_NOFS
);
8982 cache
->free_space_ctl
= kzalloc(sizeof(*cache
->free_space_ctl
),
8984 if (!cache
->free_space_ctl
) {
8989 cache
->key
.objectid
= start
;
8990 cache
->key
.offset
= size
;
8991 cache
->key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
8993 cache
->sectorsize
= root
->sectorsize
;
8994 cache
->fs_info
= root
->fs_info
;
8995 cache
->full_stripe_len
= btrfs_full_stripe_len(root
,
8996 &root
->fs_info
->mapping_tree
,
8998 atomic_set(&cache
->count
, 1);
8999 spin_lock_init(&cache
->lock
);
9000 init_rwsem(&cache
->data_rwsem
);
9001 INIT_LIST_HEAD(&cache
->list
);
9002 INIT_LIST_HEAD(&cache
->cluster_list
);
9003 INIT_LIST_HEAD(&cache
->bg_list
);
9004 INIT_LIST_HEAD(&cache
->ro_list
);
9005 btrfs_init_free_space_ctl(cache
);
9006 atomic_set(&cache
->trimming
, 0);
9011 int btrfs_read_block_groups(struct btrfs_root
*root
)
9013 struct btrfs_path
*path
;
9015 struct btrfs_block_group_cache
*cache
;
9016 struct btrfs_fs_info
*info
= root
->fs_info
;
9017 struct btrfs_space_info
*space_info
;
9018 struct btrfs_key key
;
9019 struct btrfs_key found_key
;
9020 struct extent_buffer
*leaf
;
9024 root
= info
->extent_root
;
9027 key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
9028 path
= btrfs_alloc_path();
9033 cache_gen
= btrfs_super_cache_generation(root
->fs_info
->super_copy
);
9034 if (btrfs_test_opt(root
, SPACE_CACHE
) &&
9035 btrfs_super_generation(root
->fs_info
->super_copy
) != cache_gen
)
9037 if (btrfs_test_opt(root
, CLEAR_CACHE
))
9041 ret
= find_first_block_group(root
, path
, &key
);
9047 leaf
= path
->nodes
[0];
9048 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
9050 cache
= btrfs_create_block_group_cache(root
, found_key
.objectid
,
9059 * When we mount with old space cache, we need to
9060 * set BTRFS_DC_CLEAR and set dirty flag.
9062 * a) Setting 'BTRFS_DC_CLEAR' makes sure that we
9063 * truncate the old free space cache inode and
9065 * b) Setting 'dirty flag' makes sure that we flush
9066 * the new space cache info onto disk.
9068 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
9069 if (btrfs_test_opt(root
, SPACE_CACHE
))
9073 read_extent_buffer(leaf
, &cache
->item
,
9074 btrfs_item_ptr_offset(leaf
, path
->slots
[0]),
9075 sizeof(cache
->item
));
9076 cache
->flags
= btrfs_block_group_flags(&cache
->item
);
9078 key
.objectid
= found_key
.objectid
+ found_key
.offset
;
9079 btrfs_release_path(path
);
9082 * We need to exclude the super stripes now so that the space
9083 * info has super bytes accounted for, otherwise we'll think
9084 * we have more space than we actually do.
9086 ret
= exclude_super_stripes(root
, cache
);
9089 * We may have excluded something, so call this just in
9092 free_excluded_extents(root
, cache
);
9093 btrfs_put_block_group(cache
);
9098 * check for two cases, either we are full, and therefore
9099 * don't need to bother with the caching work since we won't
9100 * find any space, or we are empty, and we can just add all
9101 * the space in and be done with it. This saves us _alot_ of
9102 * time, particularly in the full case.
9104 if (found_key
.offset
== btrfs_block_group_used(&cache
->item
)) {
9105 cache
->last_byte_to_unpin
= (u64
)-1;
9106 cache
->cached
= BTRFS_CACHE_FINISHED
;
9107 free_excluded_extents(root
, cache
);
9108 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
9109 cache
->last_byte_to_unpin
= (u64
)-1;
9110 cache
->cached
= BTRFS_CACHE_FINISHED
;
9111 add_new_free_space(cache
, root
->fs_info
,
9113 found_key
.objectid
+
9115 free_excluded_extents(root
, cache
);
9118 ret
= btrfs_add_block_group_cache(root
->fs_info
, cache
);
9120 btrfs_remove_free_space_cache(cache
);
9121 btrfs_put_block_group(cache
);
9125 ret
= update_space_info(info
, cache
->flags
, found_key
.offset
,
9126 btrfs_block_group_used(&cache
->item
),
9129 btrfs_remove_free_space_cache(cache
);
9130 spin_lock(&info
->block_group_cache_lock
);
9131 rb_erase(&cache
->cache_node
,
9132 &info
->block_group_cache_tree
);
9133 spin_unlock(&info
->block_group_cache_lock
);
9134 btrfs_put_block_group(cache
);
9138 cache
->space_info
= space_info
;
9139 spin_lock(&cache
->space_info
->lock
);
9140 cache
->space_info
->bytes_readonly
+= cache
->bytes_super
;
9141 spin_unlock(&cache
->space_info
->lock
);
9143 __link_block_group(space_info
, cache
);
9145 set_avail_alloc_bits(root
->fs_info
, cache
->flags
);
9146 if (btrfs_chunk_readonly(root
, cache
->key
.objectid
)) {
9147 set_block_group_ro(cache
, 1);
9148 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
9149 spin_lock(&info
->unused_bgs_lock
);
9150 /* Should always be true but just in case. */
9151 if (list_empty(&cache
->bg_list
)) {
9152 btrfs_get_block_group(cache
);
9153 list_add_tail(&cache
->bg_list
,
9156 spin_unlock(&info
->unused_bgs_lock
);
9160 list_for_each_entry_rcu(space_info
, &root
->fs_info
->space_info
, list
) {
9161 if (!(get_alloc_profile(root
, space_info
->flags
) &
9162 (BTRFS_BLOCK_GROUP_RAID10
|
9163 BTRFS_BLOCK_GROUP_RAID1
|
9164 BTRFS_BLOCK_GROUP_RAID5
|
9165 BTRFS_BLOCK_GROUP_RAID6
|
9166 BTRFS_BLOCK_GROUP_DUP
)))
9169 * avoid allocating from un-mirrored block group if there are
9170 * mirrored block groups.
9172 list_for_each_entry(cache
,
9173 &space_info
->block_groups
[BTRFS_RAID_RAID0
],
9175 set_block_group_ro(cache
, 1);
9176 list_for_each_entry(cache
,
9177 &space_info
->block_groups
[BTRFS_RAID_SINGLE
],
9179 set_block_group_ro(cache
, 1);
9182 init_global_block_rsv(info
);
9185 btrfs_free_path(path
);
9189 void btrfs_create_pending_block_groups(struct btrfs_trans_handle
*trans
,
9190 struct btrfs_root
*root
)
9192 struct btrfs_block_group_cache
*block_group
, *tmp
;
9193 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
9194 struct btrfs_block_group_item item
;
9195 struct btrfs_key key
;
9198 list_for_each_entry_safe(block_group
, tmp
, &trans
->new_bgs
, bg_list
) {
9202 spin_lock(&block_group
->lock
);
9203 memcpy(&item
, &block_group
->item
, sizeof(item
));
9204 memcpy(&key
, &block_group
->key
, sizeof(key
));
9205 spin_unlock(&block_group
->lock
);
9207 ret
= btrfs_insert_item(trans
, extent_root
, &key
, &item
,
9210 btrfs_abort_transaction(trans
, extent_root
, ret
);
9211 ret
= btrfs_finish_chunk_alloc(trans
, extent_root
,
9212 key
.objectid
, key
.offset
);
9214 btrfs_abort_transaction(trans
, extent_root
, ret
);
9216 list_del_init(&block_group
->bg_list
);
9220 int btrfs_make_block_group(struct btrfs_trans_handle
*trans
,
9221 struct btrfs_root
*root
, u64 bytes_used
,
9222 u64 type
, u64 chunk_objectid
, u64 chunk_offset
,
9226 struct btrfs_root
*extent_root
;
9227 struct btrfs_block_group_cache
*cache
;
9229 extent_root
= root
->fs_info
->extent_root
;
9231 btrfs_set_log_full_commit(root
->fs_info
, trans
);
9233 cache
= btrfs_create_block_group_cache(root
, chunk_offset
, size
);
9237 btrfs_set_block_group_used(&cache
->item
, bytes_used
);
9238 btrfs_set_block_group_chunk_objectid(&cache
->item
, chunk_objectid
);
9239 btrfs_set_block_group_flags(&cache
->item
, type
);
9241 cache
->flags
= type
;
9242 cache
->last_byte_to_unpin
= (u64
)-1;
9243 cache
->cached
= BTRFS_CACHE_FINISHED
;
9244 ret
= exclude_super_stripes(root
, cache
);
9247 * We may have excluded something, so call this just in
9250 free_excluded_extents(root
, cache
);
9251 btrfs_put_block_group(cache
);
9255 add_new_free_space(cache
, root
->fs_info
, chunk_offset
,
9256 chunk_offset
+ size
);
9258 free_excluded_extents(root
, cache
);
9260 ret
= btrfs_add_block_group_cache(root
->fs_info
, cache
);
9262 btrfs_remove_free_space_cache(cache
);
9263 btrfs_put_block_group(cache
);
9267 ret
= update_space_info(root
->fs_info
, cache
->flags
, size
, bytes_used
,
9268 &cache
->space_info
);
9270 btrfs_remove_free_space_cache(cache
);
9271 spin_lock(&root
->fs_info
->block_group_cache_lock
);
9272 rb_erase(&cache
->cache_node
,
9273 &root
->fs_info
->block_group_cache_tree
);
9274 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
9275 btrfs_put_block_group(cache
);
9278 update_global_block_rsv(root
->fs_info
);
9280 spin_lock(&cache
->space_info
->lock
);
9281 cache
->space_info
->bytes_readonly
+= cache
->bytes_super
;
9282 spin_unlock(&cache
->space_info
->lock
);
9284 __link_block_group(cache
->space_info
, cache
);
9286 list_add_tail(&cache
->bg_list
, &trans
->new_bgs
);
9288 set_avail_alloc_bits(extent_root
->fs_info
, type
);
9293 static void clear_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
9295 u64 extra_flags
= chunk_to_extended(flags
) &
9296 BTRFS_EXTENDED_PROFILE_MASK
;
9298 write_seqlock(&fs_info
->profiles_lock
);
9299 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
9300 fs_info
->avail_data_alloc_bits
&= ~extra_flags
;
9301 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
9302 fs_info
->avail_metadata_alloc_bits
&= ~extra_flags
;
9303 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
9304 fs_info
->avail_system_alloc_bits
&= ~extra_flags
;
9305 write_sequnlock(&fs_info
->profiles_lock
);
9308 int btrfs_remove_block_group(struct btrfs_trans_handle
*trans
,
9309 struct btrfs_root
*root
, u64 group_start
,
9310 struct extent_map
*em
)
9312 struct btrfs_path
*path
;
9313 struct btrfs_block_group_cache
*block_group
;
9314 struct btrfs_free_cluster
*cluster
;
9315 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
9316 struct btrfs_key key
;
9317 struct inode
*inode
;
9318 struct kobject
*kobj
= NULL
;
9322 struct btrfs_caching_control
*caching_ctl
= NULL
;
9325 root
= root
->fs_info
->extent_root
;
9327 block_group
= btrfs_lookup_block_group(root
->fs_info
, group_start
);
9328 BUG_ON(!block_group
);
9329 BUG_ON(!block_group
->ro
);
9332 * Free the reserved super bytes from this block group before
9335 free_excluded_extents(root
, block_group
);
9337 memcpy(&key
, &block_group
->key
, sizeof(key
));
9338 index
= get_block_group_index(block_group
);
9339 if (block_group
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
9340 BTRFS_BLOCK_GROUP_RAID1
|
9341 BTRFS_BLOCK_GROUP_RAID10
))
9346 /* make sure this block group isn't part of an allocation cluster */
9347 cluster
= &root
->fs_info
->data_alloc_cluster
;
9348 spin_lock(&cluster
->refill_lock
);
9349 btrfs_return_cluster_to_free_space(block_group
, cluster
);
9350 spin_unlock(&cluster
->refill_lock
);
9353 * make sure this block group isn't part of a metadata
9354 * allocation cluster
9356 cluster
= &root
->fs_info
->meta_alloc_cluster
;
9357 spin_lock(&cluster
->refill_lock
);
9358 btrfs_return_cluster_to_free_space(block_group
, cluster
);
9359 spin_unlock(&cluster
->refill_lock
);
9361 path
= btrfs_alloc_path();
9367 inode
= lookup_free_space_inode(tree_root
, block_group
, path
);
9368 if (!IS_ERR(inode
)) {
9369 ret
= btrfs_orphan_add(trans
, inode
);
9371 btrfs_add_delayed_iput(inode
);
9375 /* One for the block groups ref */
9376 spin_lock(&block_group
->lock
);
9377 if (block_group
->iref
) {
9378 block_group
->iref
= 0;
9379 block_group
->inode
= NULL
;
9380 spin_unlock(&block_group
->lock
);
9383 spin_unlock(&block_group
->lock
);
9385 /* One for our lookup ref */
9386 btrfs_add_delayed_iput(inode
);
9389 key
.objectid
= BTRFS_FREE_SPACE_OBJECTID
;
9390 key
.offset
= block_group
->key
.objectid
;
9393 ret
= btrfs_search_slot(trans
, tree_root
, &key
, path
, -1, 1);
9397 btrfs_release_path(path
);
9399 ret
= btrfs_del_item(trans
, tree_root
, path
);
9402 btrfs_release_path(path
);
9405 spin_lock(&root
->fs_info
->block_group_cache_lock
);
9406 rb_erase(&block_group
->cache_node
,
9407 &root
->fs_info
->block_group_cache_tree
);
9408 RB_CLEAR_NODE(&block_group
->cache_node
);
9410 if (root
->fs_info
->first_logical_byte
== block_group
->key
.objectid
)
9411 root
->fs_info
->first_logical_byte
= (u64
)-1;
9412 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
9414 down_write(&block_group
->space_info
->groups_sem
);
9416 * we must use list_del_init so people can check to see if they
9417 * are still on the list after taking the semaphore
9419 list_del_init(&block_group
->list
);
9420 list_del_init(&block_group
->ro_list
);
9421 if (list_empty(&block_group
->space_info
->block_groups
[index
])) {
9422 kobj
= block_group
->space_info
->block_group_kobjs
[index
];
9423 block_group
->space_info
->block_group_kobjs
[index
] = NULL
;
9424 clear_avail_alloc_bits(root
->fs_info
, block_group
->flags
);
9426 up_write(&block_group
->space_info
->groups_sem
);
9432 if (block_group
->has_caching_ctl
)
9433 caching_ctl
= get_caching_control(block_group
);
9434 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
9435 wait_block_group_cache_done(block_group
);
9436 if (block_group
->has_caching_ctl
) {
9437 down_write(&root
->fs_info
->commit_root_sem
);
9439 struct btrfs_caching_control
*ctl
;
9441 list_for_each_entry(ctl
,
9442 &root
->fs_info
->caching_block_groups
, list
)
9443 if (ctl
->block_group
== block_group
) {
9445 atomic_inc(&caching_ctl
->count
);
9450 list_del_init(&caching_ctl
->list
);
9451 up_write(&root
->fs_info
->commit_root_sem
);
9453 /* Once for the caching bgs list and once for us. */
9454 put_caching_control(caching_ctl
);
9455 put_caching_control(caching_ctl
);
9459 btrfs_remove_free_space_cache(block_group
);
9461 spin_lock(&block_group
->space_info
->lock
);
9462 block_group
->space_info
->total_bytes
-= block_group
->key
.offset
;
9463 block_group
->space_info
->bytes_readonly
-= block_group
->key
.offset
;
9464 block_group
->space_info
->disk_total
-= block_group
->key
.offset
* factor
;
9465 spin_unlock(&block_group
->space_info
->lock
);
9467 memcpy(&key
, &block_group
->key
, sizeof(key
));
9470 if (!list_empty(&em
->list
)) {
9471 /* We're in the transaction->pending_chunks list. */
9472 free_extent_map(em
);
9474 spin_lock(&block_group
->lock
);
9475 block_group
->removed
= 1;
9477 * At this point trimming can't start on this block group, because we
9478 * removed the block group from the tree fs_info->block_group_cache_tree
9479 * so no one can't find it anymore and even if someone already got this
9480 * block group before we removed it from the rbtree, they have already
9481 * incremented block_group->trimming - if they didn't, they won't find
9482 * any free space entries because we already removed them all when we
9483 * called btrfs_remove_free_space_cache().
9485 * And we must not remove the extent map from the fs_info->mapping_tree
9486 * to prevent the same logical address range and physical device space
9487 * ranges from being reused for a new block group. This is because our
9488 * fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is
9489 * completely transactionless, so while it is trimming a range the
9490 * currently running transaction might finish and a new one start,
9491 * allowing for new block groups to be created that can reuse the same
9492 * physical device locations unless we take this special care.
9494 remove_em
= (atomic_read(&block_group
->trimming
) == 0);
9496 * Make sure a trimmer task always sees the em in the pinned_chunks list
9497 * if it sees block_group->removed == 1 (needs to lock block_group->lock
9498 * before checking block_group->removed).
9502 * Our em might be in trans->transaction->pending_chunks which
9503 * is protected by fs_info->chunk_mutex ([lock|unlock]_chunks),
9504 * and so is the fs_info->pinned_chunks list.
9506 * So at this point we must be holding the chunk_mutex to avoid
9507 * any races with chunk allocation (more specifically at
9508 * volumes.c:contains_pending_extent()), to ensure it always
9509 * sees the em, either in the pending_chunks list or in the
9510 * pinned_chunks list.
9512 list_move_tail(&em
->list
, &root
->fs_info
->pinned_chunks
);
9514 spin_unlock(&block_group
->lock
);
9517 struct extent_map_tree
*em_tree
;
9519 em_tree
= &root
->fs_info
->mapping_tree
.map_tree
;
9520 write_lock(&em_tree
->lock
);
9522 * The em might be in the pending_chunks list, so make sure the
9523 * chunk mutex is locked, since remove_extent_mapping() will
9524 * delete us from that list.
9526 remove_extent_mapping(em_tree
, em
);
9527 write_unlock(&em_tree
->lock
);
9528 /* once for the tree */
9529 free_extent_map(em
);
9532 unlock_chunks(root
);
9534 btrfs_put_block_group(block_group
);
9535 btrfs_put_block_group(block_group
);
9537 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
9543 ret
= btrfs_del_item(trans
, root
, path
);
9545 btrfs_free_path(path
);
9550 * Process the unused_bgs list and remove any that don't have any allocated
9551 * space inside of them.
9553 void btrfs_delete_unused_bgs(struct btrfs_fs_info
*fs_info
)
9555 struct btrfs_block_group_cache
*block_group
;
9556 struct btrfs_space_info
*space_info
;
9557 struct btrfs_root
*root
= fs_info
->extent_root
;
9558 struct btrfs_trans_handle
*trans
;
9564 spin_lock(&fs_info
->unused_bgs_lock
);
9565 while (!list_empty(&fs_info
->unused_bgs
)) {
9568 block_group
= list_first_entry(&fs_info
->unused_bgs
,
9569 struct btrfs_block_group_cache
,
9571 space_info
= block_group
->space_info
;
9572 list_del_init(&block_group
->bg_list
);
9573 if (ret
|| btrfs_mixed_space_info(space_info
)) {
9574 btrfs_put_block_group(block_group
);
9577 spin_unlock(&fs_info
->unused_bgs_lock
);
9579 /* Don't want to race with allocators so take the groups_sem */
9580 down_write(&space_info
->groups_sem
);
9581 spin_lock(&block_group
->lock
);
9582 if (block_group
->reserved
||
9583 btrfs_block_group_used(&block_group
->item
) ||
9586 * We want to bail if we made new allocations or have
9587 * outstanding allocations in this block group. We do
9588 * the ro check in case balance is currently acting on
9591 spin_unlock(&block_group
->lock
);
9592 up_write(&space_info
->groups_sem
);
9595 spin_unlock(&block_group
->lock
);
9597 /* We don't want to force the issue, only flip if it's ok. */
9598 ret
= set_block_group_ro(block_group
, 0);
9599 up_write(&space_info
->groups_sem
);
9606 * Want to do this before we do anything else so we can recover
9607 * properly if we fail to join the transaction.
9609 trans
= btrfs_join_transaction(root
);
9610 if (IS_ERR(trans
)) {
9611 btrfs_set_block_group_rw(root
, block_group
);
9612 ret
= PTR_ERR(trans
);
9617 * We could have pending pinned extents for this block group,
9618 * just delete them, we don't care about them anymore.
9620 start
= block_group
->key
.objectid
;
9621 end
= start
+ block_group
->key
.offset
- 1;
9622 ret
= clear_extent_bits(&fs_info
->freed_extents
[0], start
, end
,
9623 EXTENT_DIRTY
, GFP_NOFS
);
9625 btrfs_set_block_group_rw(root
, block_group
);
9628 ret
= clear_extent_bits(&fs_info
->freed_extents
[1], start
, end
,
9629 EXTENT_DIRTY
, GFP_NOFS
);
9631 btrfs_set_block_group_rw(root
, block_group
);
9635 /* Reset pinned so btrfs_put_block_group doesn't complain */
9636 block_group
->pinned
= 0;
9639 * Btrfs_remove_chunk will abort the transaction if things go
9642 ret
= btrfs_remove_chunk(trans
, root
,
9643 block_group
->key
.objectid
);
9645 btrfs_end_transaction(trans
, root
);
9647 btrfs_put_block_group(block_group
);
9648 spin_lock(&fs_info
->unused_bgs_lock
);
9650 spin_unlock(&fs_info
->unused_bgs_lock
);
9653 int btrfs_init_space_info(struct btrfs_fs_info
*fs_info
)
9655 struct btrfs_space_info
*space_info
;
9656 struct btrfs_super_block
*disk_super
;
9662 disk_super
= fs_info
->super_copy
;
9663 if (!btrfs_super_root(disk_super
))
9666 features
= btrfs_super_incompat_flags(disk_super
);
9667 if (features
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
)
9670 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
9671 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9676 flags
= BTRFS_BLOCK_GROUP_METADATA
| BTRFS_BLOCK_GROUP_DATA
;
9677 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9679 flags
= BTRFS_BLOCK_GROUP_METADATA
;
9680 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9684 flags
= BTRFS_BLOCK_GROUP_DATA
;
9685 ret
= update_space_info(fs_info
, flags
, 0, 0, &space_info
);
9691 int btrfs_error_unpin_extent_range(struct btrfs_root
*root
, u64 start
, u64 end
)
9693 return unpin_extent_range(root
, start
, end
);
9696 int btrfs_error_discard_extent(struct btrfs_root
*root
, u64 bytenr
,
9697 u64 num_bytes
, u64
*actual_bytes
)
9699 return btrfs_discard_extent(root
, bytenr
, num_bytes
, actual_bytes
);
9702 int btrfs_trim_fs(struct btrfs_root
*root
, struct fstrim_range
*range
)
9704 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
9705 struct btrfs_block_group_cache
*cache
= NULL
;
9710 u64 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
9714 * try to trim all FS space, our block group may start from non-zero.
9716 if (range
->len
== total_bytes
)
9717 cache
= btrfs_lookup_first_block_group(fs_info
, range
->start
);
9719 cache
= btrfs_lookup_block_group(fs_info
, range
->start
);
9722 if (cache
->key
.objectid
>= (range
->start
+ range
->len
)) {
9723 btrfs_put_block_group(cache
);
9727 start
= max(range
->start
, cache
->key
.objectid
);
9728 end
= min(range
->start
+ range
->len
,
9729 cache
->key
.objectid
+ cache
->key
.offset
);
9731 if (end
- start
>= range
->minlen
) {
9732 if (!block_group_cache_done(cache
)) {
9733 ret
= cache_block_group(cache
, 0);
9735 btrfs_put_block_group(cache
);
9738 ret
= wait_block_group_cache_done(cache
);
9740 btrfs_put_block_group(cache
);
9744 ret
= btrfs_trim_block_group(cache
,
9750 trimmed
+= group_trimmed
;
9752 btrfs_put_block_group(cache
);
9757 cache
= next_block_group(fs_info
->tree_root
, cache
);
9760 range
->len
= trimmed
;
9765 * btrfs_{start,end}_write_no_snapshoting() are similar to
9766 * mnt_{want,drop}_write(), they are used to prevent some tasks from writing
9767 * data into the page cache through nocow before the subvolume is snapshoted,
9768 * but flush the data into disk after the snapshot creation, or to prevent
9769 * operations while snapshoting is ongoing and that cause the snapshot to be
9770 * inconsistent (writes followed by expanding truncates for example).
9772 void btrfs_end_write_no_snapshoting(struct btrfs_root
*root
)
9774 percpu_counter_dec(&root
->subv_writers
->counter
);
9776 * Make sure counter is updated before we wake up
9780 if (waitqueue_active(&root
->subv_writers
->wait
))
9781 wake_up(&root
->subv_writers
->wait
);
9784 int btrfs_start_write_no_snapshoting(struct btrfs_root
*root
)
9786 if (atomic_read(&root
->will_be_snapshoted
))
9789 percpu_counter_inc(&root
->subv_writers
->counter
);
9791 * Make sure counter is updated before we check for snapshot creation.
9794 if (atomic_read(&root
->will_be_snapshoted
)) {
9795 btrfs_end_write_no_snapshoting(root
);