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>
30 #include "print-tree.h"
31 #include "transaction.h"
34 #include "free-space-cache.h"
36 static int update_block_group(struct btrfs_trans_handle
*trans
,
37 struct btrfs_root
*root
,
38 u64 bytenr
, u64 num_bytes
, int alloc
);
39 static int update_reserved_bytes(struct btrfs_block_group_cache
*cache
,
40 u64 num_bytes
, int reserve
, int sinfo
);
41 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
42 struct btrfs_root
*root
,
43 u64 bytenr
, u64 num_bytes
, u64 parent
,
44 u64 root_objectid
, u64 owner_objectid
,
45 u64 owner_offset
, int refs_to_drop
,
46 struct btrfs_delayed_extent_op
*extra_op
);
47 static void __run_delayed_extent_op(struct btrfs_delayed_extent_op
*extent_op
,
48 struct extent_buffer
*leaf
,
49 struct btrfs_extent_item
*ei
);
50 static int alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
51 struct btrfs_root
*root
,
52 u64 parent
, u64 root_objectid
,
53 u64 flags
, u64 owner
, u64 offset
,
54 struct btrfs_key
*ins
, int ref_mod
);
55 static int alloc_reserved_tree_block(struct btrfs_trans_handle
*trans
,
56 struct btrfs_root
*root
,
57 u64 parent
, u64 root_objectid
,
58 u64 flags
, struct btrfs_disk_key
*key
,
59 int level
, struct btrfs_key
*ins
);
60 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
,
61 struct btrfs_root
*extent_root
, u64 alloc_bytes
,
62 u64 flags
, int force
);
63 static int find_next_key(struct btrfs_path
*path
, int level
,
64 struct btrfs_key
*key
);
65 static void dump_space_info(struct btrfs_space_info
*info
, u64 bytes
,
66 int dump_block_groups
);
69 block_group_cache_done(struct btrfs_block_group_cache
*cache
)
72 return cache
->cached
== BTRFS_CACHE_FINISHED
;
75 static int block_group_bits(struct btrfs_block_group_cache
*cache
, u64 bits
)
77 return (cache
->flags
& bits
) == bits
;
80 void btrfs_get_block_group(struct btrfs_block_group_cache
*cache
)
82 atomic_inc(&cache
->count
);
85 void btrfs_put_block_group(struct btrfs_block_group_cache
*cache
)
87 if (atomic_dec_and_test(&cache
->count
)) {
88 WARN_ON(cache
->pinned
> 0);
89 WARN_ON(cache
->reserved
> 0);
90 WARN_ON(cache
->reserved_pinned
> 0);
96 * this adds the block group to the fs_info rb tree for the block group
99 static int btrfs_add_block_group_cache(struct btrfs_fs_info
*info
,
100 struct btrfs_block_group_cache
*block_group
)
103 struct rb_node
*parent
= NULL
;
104 struct btrfs_block_group_cache
*cache
;
106 spin_lock(&info
->block_group_cache_lock
);
107 p
= &info
->block_group_cache_tree
.rb_node
;
111 cache
= rb_entry(parent
, struct btrfs_block_group_cache
,
113 if (block_group
->key
.objectid
< cache
->key
.objectid
) {
115 } else if (block_group
->key
.objectid
> cache
->key
.objectid
) {
118 spin_unlock(&info
->block_group_cache_lock
);
123 rb_link_node(&block_group
->cache_node
, parent
, p
);
124 rb_insert_color(&block_group
->cache_node
,
125 &info
->block_group_cache_tree
);
126 spin_unlock(&info
->block_group_cache_lock
);
132 * This will return the block group at or after bytenr if contains is 0, else
133 * it will return the block group that contains the bytenr
135 static struct btrfs_block_group_cache
*
136 block_group_cache_tree_search(struct btrfs_fs_info
*info
, u64 bytenr
,
139 struct btrfs_block_group_cache
*cache
, *ret
= NULL
;
143 spin_lock(&info
->block_group_cache_lock
);
144 n
= info
->block_group_cache_tree
.rb_node
;
147 cache
= rb_entry(n
, struct btrfs_block_group_cache
,
149 end
= cache
->key
.objectid
+ cache
->key
.offset
- 1;
150 start
= cache
->key
.objectid
;
152 if (bytenr
< start
) {
153 if (!contains
&& (!ret
|| start
< ret
->key
.objectid
))
156 } else if (bytenr
> start
) {
157 if (contains
&& bytenr
<= end
) {
168 btrfs_get_block_group(ret
);
169 spin_unlock(&info
->block_group_cache_lock
);
174 static int add_excluded_extent(struct btrfs_root
*root
,
175 u64 start
, u64 num_bytes
)
177 u64 end
= start
+ num_bytes
- 1;
178 set_extent_bits(&root
->fs_info
->freed_extents
[0],
179 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
180 set_extent_bits(&root
->fs_info
->freed_extents
[1],
181 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
185 static void free_excluded_extents(struct btrfs_root
*root
,
186 struct btrfs_block_group_cache
*cache
)
190 start
= cache
->key
.objectid
;
191 end
= start
+ cache
->key
.offset
- 1;
193 clear_extent_bits(&root
->fs_info
->freed_extents
[0],
194 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
195 clear_extent_bits(&root
->fs_info
->freed_extents
[1],
196 start
, end
, EXTENT_UPTODATE
, GFP_NOFS
);
199 static int exclude_super_stripes(struct btrfs_root
*root
,
200 struct btrfs_block_group_cache
*cache
)
207 if (cache
->key
.objectid
< BTRFS_SUPER_INFO_OFFSET
) {
208 stripe_len
= BTRFS_SUPER_INFO_OFFSET
- cache
->key
.objectid
;
209 cache
->bytes_super
+= stripe_len
;
210 ret
= add_excluded_extent(root
, cache
->key
.objectid
,
215 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
216 bytenr
= btrfs_sb_offset(i
);
217 ret
= btrfs_rmap_block(&root
->fs_info
->mapping_tree
,
218 cache
->key
.objectid
, bytenr
,
219 0, &logical
, &nr
, &stripe_len
);
223 cache
->bytes_super
+= stripe_len
;
224 ret
= add_excluded_extent(root
, logical
[nr
],
234 static struct btrfs_caching_control
*
235 get_caching_control(struct btrfs_block_group_cache
*cache
)
237 struct btrfs_caching_control
*ctl
;
239 spin_lock(&cache
->lock
);
240 if (cache
->cached
!= BTRFS_CACHE_STARTED
) {
241 spin_unlock(&cache
->lock
);
245 /* We're loading it the fast way, so we don't have a caching_ctl. */
246 if (!cache
->caching_ctl
) {
247 spin_unlock(&cache
->lock
);
251 ctl
= cache
->caching_ctl
;
252 atomic_inc(&ctl
->count
);
253 spin_unlock(&cache
->lock
);
257 static void put_caching_control(struct btrfs_caching_control
*ctl
)
259 if (atomic_dec_and_test(&ctl
->count
))
264 * this is only called by cache_block_group, since we could have freed extents
265 * we need to check the pinned_extents for any extents that can't be used yet
266 * since their free space will be released as soon as the transaction commits.
268 static u64
add_new_free_space(struct btrfs_block_group_cache
*block_group
,
269 struct btrfs_fs_info
*info
, u64 start
, u64 end
)
271 u64 extent_start
, extent_end
, size
, total_added
= 0;
274 while (start
< end
) {
275 ret
= find_first_extent_bit(info
->pinned_extents
, start
,
276 &extent_start
, &extent_end
,
277 EXTENT_DIRTY
| EXTENT_UPTODATE
);
281 if (extent_start
<= start
) {
282 start
= extent_end
+ 1;
283 } else if (extent_start
> start
&& extent_start
< end
) {
284 size
= extent_start
- start
;
286 ret
= btrfs_add_free_space(block_group
, start
,
289 start
= extent_end
+ 1;
298 ret
= btrfs_add_free_space(block_group
, start
, size
);
305 static int caching_kthread(void *data
)
307 struct btrfs_block_group_cache
*block_group
= data
;
308 struct btrfs_fs_info
*fs_info
= block_group
->fs_info
;
309 struct btrfs_caching_control
*caching_ctl
= block_group
->caching_ctl
;
310 struct btrfs_root
*extent_root
= fs_info
->extent_root
;
311 struct btrfs_path
*path
;
312 struct extent_buffer
*leaf
;
313 struct btrfs_key key
;
319 path
= btrfs_alloc_path();
323 last
= max_t(u64
, block_group
->key
.objectid
, BTRFS_SUPER_INFO_OFFSET
);
326 * We don't want to deadlock with somebody trying to allocate a new
327 * extent for the extent root while also trying to search the extent
328 * root to add free space. So we skip locking and search the commit
329 * root, since its read-only
331 path
->skip_locking
= 1;
332 path
->search_commit_root
= 1;
337 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
339 mutex_lock(&caching_ctl
->mutex
);
340 /* need to make sure the commit_root doesn't disappear */
341 down_read(&fs_info
->extent_commit_sem
);
343 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
347 leaf
= path
->nodes
[0];
348 nritems
= btrfs_header_nritems(leaf
);
352 if (fs_info
->closing
> 1) {
357 if (path
->slots
[0] < nritems
) {
358 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
360 ret
= find_next_key(path
, 0, &key
);
364 caching_ctl
->progress
= last
;
365 btrfs_release_path(extent_root
, path
);
366 up_read(&fs_info
->extent_commit_sem
);
367 mutex_unlock(&caching_ctl
->mutex
);
368 if (btrfs_transaction_in_commit(fs_info
))
375 if (key
.objectid
< block_group
->key
.objectid
) {
380 if (key
.objectid
>= block_group
->key
.objectid
+
381 block_group
->key
.offset
)
384 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
) {
385 total_found
+= add_new_free_space(block_group
,
388 last
= key
.objectid
+ key
.offset
;
390 if (total_found
> (1024 * 1024 * 2)) {
392 wake_up(&caching_ctl
->wait
);
399 total_found
+= add_new_free_space(block_group
, fs_info
, last
,
400 block_group
->key
.objectid
+
401 block_group
->key
.offset
);
402 caching_ctl
->progress
= (u64
)-1;
404 spin_lock(&block_group
->lock
);
405 block_group
->caching_ctl
= NULL
;
406 block_group
->cached
= BTRFS_CACHE_FINISHED
;
407 spin_unlock(&block_group
->lock
);
410 btrfs_free_path(path
);
411 up_read(&fs_info
->extent_commit_sem
);
413 free_excluded_extents(extent_root
, block_group
);
415 mutex_unlock(&caching_ctl
->mutex
);
416 wake_up(&caching_ctl
->wait
);
418 put_caching_control(caching_ctl
);
419 atomic_dec(&block_group
->space_info
->caching_threads
);
420 btrfs_put_block_group(block_group
);
425 static int cache_block_group(struct btrfs_block_group_cache
*cache
,
426 struct btrfs_trans_handle
*trans
,
427 struct btrfs_root
*root
,
430 struct btrfs_fs_info
*fs_info
= cache
->fs_info
;
431 struct btrfs_caching_control
*caching_ctl
;
432 struct task_struct
*tsk
;
436 if (cache
->cached
!= BTRFS_CACHE_NO
)
440 * We can't do the read from on-disk cache during a commit since we need
441 * to have the normal tree locking. Also if we are currently trying to
442 * allocate blocks for the tree root we can't do the fast caching since
443 * we likely hold important locks.
445 if (!trans
->transaction
->in_commit
&&
446 (root
&& root
!= root
->fs_info
->tree_root
)) {
447 spin_lock(&cache
->lock
);
448 if (cache
->cached
!= BTRFS_CACHE_NO
) {
449 spin_unlock(&cache
->lock
);
452 cache
->cached
= BTRFS_CACHE_STARTED
;
453 spin_unlock(&cache
->lock
);
455 ret
= load_free_space_cache(fs_info
, cache
);
457 spin_lock(&cache
->lock
);
459 cache
->cached
= BTRFS_CACHE_FINISHED
;
460 cache
->last_byte_to_unpin
= (u64
)-1;
462 cache
->cached
= BTRFS_CACHE_NO
;
464 spin_unlock(&cache
->lock
);
466 free_excluded_extents(fs_info
->extent_root
, cache
);
474 caching_ctl
= kzalloc(sizeof(*caching_ctl
), GFP_KERNEL
);
475 BUG_ON(!caching_ctl
);
477 INIT_LIST_HEAD(&caching_ctl
->list
);
478 mutex_init(&caching_ctl
->mutex
);
479 init_waitqueue_head(&caching_ctl
->wait
);
480 caching_ctl
->block_group
= cache
;
481 caching_ctl
->progress
= cache
->key
.objectid
;
482 /* one for caching kthread, one for caching block group list */
483 atomic_set(&caching_ctl
->count
, 2);
485 spin_lock(&cache
->lock
);
486 if (cache
->cached
!= BTRFS_CACHE_NO
) {
487 spin_unlock(&cache
->lock
);
491 cache
->caching_ctl
= caching_ctl
;
492 cache
->cached
= BTRFS_CACHE_STARTED
;
493 spin_unlock(&cache
->lock
);
495 down_write(&fs_info
->extent_commit_sem
);
496 list_add_tail(&caching_ctl
->list
, &fs_info
->caching_block_groups
);
497 up_write(&fs_info
->extent_commit_sem
);
499 atomic_inc(&cache
->space_info
->caching_threads
);
500 btrfs_get_block_group(cache
);
502 tsk
= kthread_run(caching_kthread
, cache
, "btrfs-cache-%llu\n",
503 cache
->key
.objectid
);
506 printk(KERN_ERR
"error running thread %d\n", ret
);
514 * return the block group that starts at or after bytenr
516 static struct btrfs_block_group_cache
*
517 btrfs_lookup_first_block_group(struct btrfs_fs_info
*info
, u64 bytenr
)
519 struct btrfs_block_group_cache
*cache
;
521 cache
= block_group_cache_tree_search(info
, bytenr
, 0);
527 * return the block group that contains the given bytenr
529 struct btrfs_block_group_cache
*btrfs_lookup_block_group(
530 struct btrfs_fs_info
*info
,
533 struct btrfs_block_group_cache
*cache
;
535 cache
= block_group_cache_tree_search(info
, bytenr
, 1);
540 static struct btrfs_space_info
*__find_space_info(struct btrfs_fs_info
*info
,
543 struct list_head
*head
= &info
->space_info
;
544 struct btrfs_space_info
*found
;
546 flags
&= BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_SYSTEM
|
547 BTRFS_BLOCK_GROUP_METADATA
;
550 list_for_each_entry_rcu(found
, head
, list
) {
551 if (found
->flags
& flags
) {
561 * after adding space to the filesystem, we need to clear the full flags
562 * on all the space infos.
564 void btrfs_clear_space_info_full(struct btrfs_fs_info
*info
)
566 struct list_head
*head
= &info
->space_info
;
567 struct btrfs_space_info
*found
;
570 list_for_each_entry_rcu(found
, head
, list
)
575 static u64
div_factor(u64 num
, int factor
)
584 static u64
div_factor_fine(u64 num
, int factor
)
593 u64
btrfs_find_block_group(struct btrfs_root
*root
,
594 u64 search_start
, u64 search_hint
, int owner
)
596 struct btrfs_block_group_cache
*cache
;
598 u64 last
= max(search_hint
, search_start
);
605 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
609 spin_lock(&cache
->lock
);
610 last
= cache
->key
.objectid
+ cache
->key
.offset
;
611 used
= btrfs_block_group_used(&cache
->item
);
613 if ((full_search
|| !cache
->ro
) &&
614 block_group_bits(cache
, BTRFS_BLOCK_GROUP_METADATA
)) {
615 if (used
+ cache
->pinned
+ cache
->reserved
<
616 div_factor(cache
->key
.offset
, factor
)) {
617 group_start
= cache
->key
.objectid
;
618 spin_unlock(&cache
->lock
);
619 btrfs_put_block_group(cache
);
623 spin_unlock(&cache
->lock
);
624 btrfs_put_block_group(cache
);
632 if (!full_search
&& factor
< 10) {
642 /* simple helper to search for an existing extent at a given offset */
643 int btrfs_lookup_extent(struct btrfs_root
*root
, u64 start
, u64 len
)
646 struct btrfs_key key
;
647 struct btrfs_path
*path
;
649 path
= btrfs_alloc_path();
651 key
.objectid
= start
;
653 btrfs_set_key_type(&key
, BTRFS_EXTENT_ITEM_KEY
);
654 ret
= btrfs_search_slot(NULL
, root
->fs_info
->extent_root
, &key
, path
,
656 btrfs_free_path(path
);
661 * helper function to lookup reference count and flags of extent.
663 * the head node for delayed ref is used to store the sum of all the
664 * reference count modifications queued up in the rbtree. the head
665 * node may also store the extent flags to set. This way you can check
666 * to see what the reference count and extent flags would be if all of
667 * the delayed refs are not processed.
669 int btrfs_lookup_extent_info(struct btrfs_trans_handle
*trans
,
670 struct btrfs_root
*root
, u64 bytenr
,
671 u64 num_bytes
, u64
*refs
, u64
*flags
)
673 struct btrfs_delayed_ref_head
*head
;
674 struct btrfs_delayed_ref_root
*delayed_refs
;
675 struct btrfs_path
*path
;
676 struct btrfs_extent_item
*ei
;
677 struct extent_buffer
*leaf
;
678 struct btrfs_key key
;
684 path
= btrfs_alloc_path();
688 key
.objectid
= bytenr
;
689 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
690 key
.offset
= num_bytes
;
692 path
->skip_locking
= 1;
693 path
->search_commit_root
= 1;
696 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
,
702 leaf
= path
->nodes
[0];
703 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
704 if (item_size
>= sizeof(*ei
)) {
705 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
706 struct btrfs_extent_item
);
707 num_refs
= btrfs_extent_refs(leaf
, ei
);
708 extent_flags
= btrfs_extent_flags(leaf
, ei
);
710 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
711 struct btrfs_extent_item_v0
*ei0
;
712 BUG_ON(item_size
!= sizeof(*ei0
));
713 ei0
= btrfs_item_ptr(leaf
, path
->slots
[0],
714 struct btrfs_extent_item_v0
);
715 num_refs
= btrfs_extent_refs_v0(leaf
, ei0
);
716 /* FIXME: this isn't correct for data */
717 extent_flags
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
722 BUG_ON(num_refs
== 0);
732 delayed_refs
= &trans
->transaction
->delayed_refs
;
733 spin_lock(&delayed_refs
->lock
);
734 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
736 if (!mutex_trylock(&head
->mutex
)) {
737 atomic_inc(&head
->node
.refs
);
738 spin_unlock(&delayed_refs
->lock
);
740 btrfs_release_path(root
->fs_info
->extent_root
, path
);
742 mutex_lock(&head
->mutex
);
743 mutex_unlock(&head
->mutex
);
744 btrfs_put_delayed_ref(&head
->node
);
747 if (head
->extent_op
&& head
->extent_op
->update_flags
)
748 extent_flags
|= head
->extent_op
->flags_to_set
;
750 BUG_ON(num_refs
== 0);
752 num_refs
+= head
->node
.ref_mod
;
753 mutex_unlock(&head
->mutex
);
755 spin_unlock(&delayed_refs
->lock
);
757 WARN_ON(num_refs
== 0);
761 *flags
= extent_flags
;
763 btrfs_free_path(path
);
768 * Back reference rules. Back refs have three main goals:
770 * 1) differentiate between all holders of references to an extent so that
771 * when a reference is dropped we can make sure it was a valid reference
772 * before freeing the extent.
774 * 2) Provide enough information to quickly find the holders of an extent
775 * if we notice a given block is corrupted or bad.
777 * 3) Make it easy to migrate blocks for FS shrinking or storage pool
778 * maintenance. This is actually the same as #2, but with a slightly
779 * different use case.
781 * There are two kinds of back refs. The implicit back refs is optimized
782 * for pointers in non-shared tree blocks. For a given pointer in a block,
783 * back refs of this kind provide information about the block's owner tree
784 * and the pointer's key. These information allow us to find the block by
785 * b-tree searching. The full back refs is for pointers in tree blocks not
786 * referenced by their owner trees. The location of tree block is recorded
787 * in the back refs. Actually the full back refs is generic, and can be
788 * used in all cases the implicit back refs is used. The major shortcoming
789 * of the full back refs is its overhead. Every time a tree block gets
790 * COWed, we have to update back refs entry for all pointers in it.
792 * For a newly allocated tree block, we use implicit back refs for
793 * pointers in it. This means most tree related operations only involve
794 * implicit back refs. For a tree block created in old transaction, the
795 * only way to drop a reference to it is COW it. So we can detect the
796 * event that tree block loses its owner tree's reference and do the
797 * back refs conversion.
799 * When a tree block is COW'd through a tree, there are four cases:
801 * The reference count of the block is one and the tree is the block's
802 * owner tree. Nothing to do in this case.
804 * The reference count of the block is one and the tree is not the
805 * block's owner tree. In this case, full back refs is used for pointers
806 * in the block. Remove these full back refs, add implicit back refs for
807 * every pointers in the new block.
809 * The reference count of the block is greater than one and the tree is
810 * the block's owner tree. In this case, implicit back refs is used for
811 * pointers in the block. Add full back refs for every pointers in the
812 * block, increase lower level extents' reference counts. The original
813 * implicit back refs are entailed to the new block.
815 * The reference count of the block is greater than one and the tree is
816 * not the block's owner tree. Add implicit back refs for every pointer in
817 * the new block, increase lower level extents' reference count.
819 * Back Reference Key composing:
821 * The key objectid corresponds to the first byte in the extent,
822 * The key type is used to differentiate between types of back refs.
823 * There are different meanings of the key offset for different types
826 * File extents can be referenced by:
828 * - multiple snapshots, subvolumes, or different generations in one subvol
829 * - different files inside a single subvolume
830 * - different offsets inside a file (bookend extents in file.c)
832 * The extent ref structure for the implicit back refs has fields for:
834 * - Objectid of the subvolume root
835 * - objectid of the file holding the reference
836 * - original offset in the file
837 * - how many bookend extents
839 * The key offset for the implicit back refs is hash of the first
842 * The extent ref structure for the full back refs has field for:
844 * - number of pointers in the tree leaf
846 * The key offset for the implicit back refs is the first byte of
849 * When a file extent is allocated, The implicit back refs is used.
850 * the fields are filled in:
852 * (root_key.objectid, inode objectid, offset in file, 1)
854 * When a file extent is removed file truncation, we find the
855 * corresponding implicit back refs and check the following fields:
857 * (btrfs_header_owner(leaf), inode objectid, offset in file)
859 * Btree extents can be referenced by:
861 * - Different subvolumes
863 * Both the implicit back refs and the full back refs for tree blocks
864 * only consist of key. The key offset for the implicit back refs is
865 * objectid of block's owner tree. The key offset for the full back refs
866 * is the first byte of parent block.
868 * When implicit back refs is used, information about the lowest key and
869 * level of the tree block are required. These information are stored in
870 * tree block info structure.
873 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
874 static int convert_extent_item_v0(struct btrfs_trans_handle
*trans
,
875 struct btrfs_root
*root
,
876 struct btrfs_path
*path
,
877 u64 owner
, u32 extra_size
)
879 struct btrfs_extent_item
*item
;
880 struct btrfs_extent_item_v0
*ei0
;
881 struct btrfs_extent_ref_v0
*ref0
;
882 struct btrfs_tree_block_info
*bi
;
883 struct extent_buffer
*leaf
;
884 struct btrfs_key key
;
885 struct btrfs_key found_key
;
886 u32 new_size
= sizeof(*item
);
890 leaf
= path
->nodes
[0];
891 BUG_ON(btrfs_item_size_nr(leaf
, path
->slots
[0]) != sizeof(*ei0
));
893 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
894 ei0
= btrfs_item_ptr(leaf
, path
->slots
[0],
895 struct btrfs_extent_item_v0
);
896 refs
= btrfs_extent_refs_v0(leaf
, ei0
);
898 if (owner
== (u64
)-1) {
900 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
901 ret
= btrfs_next_leaf(root
, path
);
905 leaf
= path
->nodes
[0];
907 btrfs_item_key_to_cpu(leaf
, &found_key
,
909 BUG_ON(key
.objectid
!= found_key
.objectid
);
910 if (found_key
.type
!= BTRFS_EXTENT_REF_V0_KEY
) {
914 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
915 struct btrfs_extent_ref_v0
);
916 owner
= btrfs_ref_objectid_v0(leaf
, ref0
);
920 btrfs_release_path(root
, path
);
922 if (owner
< BTRFS_FIRST_FREE_OBJECTID
)
923 new_size
+= sizeof(*bi
);
925 new_size
-= sizeof(*ei0
);
926 ret
= btrfs_search_slot(trans
, root
, &key
, path
,
927 new_size
+ extra_size
, 1);
932 ret
= btrfs_extend_item(trans
, root
, path
, new_size
);
935 leaf
= path
->nodes
[0];
936 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
937 btrfs_set_extent_refs(leaf
, item
, refs
);
938 /* FIXME: get real generation */
939 btrfs_set_extent_generation(leaf
, item
, 0);
940 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
941 btrfs_set_extent_flags(leaf
, item
,
942 BTRFS_EXTENT_FLAG_TREE_BLOCK
|
943 BTRFS_BLOCK_FLAG_FULL_BACKREF
);
944 bi
= (struct btrfs_tree_block_info
*)(item
+ 1);
945 /* FIXME: get first key of the block */
946 memset_extent_buffer(leaf
, 0, (unsigned long)bi
, sizeof(*bi
));
947 btrfs_set_tree_block_level(leaf
, bi
, (int)owner
);
949 btrfs_set_extent_flags(leaf
, item
, BTRFS_EXTENT_FLAG_DATA
);
951 btrfs_mark_buffer_dirty(leaf
);
956 static u64
hash_extent_data_ref(u64 root_objectid
, u64 owner
, u64 offset
)
958 u32 high_crc
= ~(u32
)0;
959 u32 low_crc
= ~(u32
)0;
962 lenum
= cpu_to_le64(root_objectid
);
963 high_crc
= crc32c(high_crc
, &lenum
, sizeof(lenum
));
964 lenum
= cpu_to_le64(owner
);
965 low_crc
= crc32c(low_crc
, &lenum
, sizeof(lenum
));
966 lenum
= cpu_to_le64(offset
);
967 low_crc
= crc32c(low_crc
, &lenum
, sizeof(lenum
));
969 return ((u64
)high_crc
<< 31) ^ (u64
)low_crc
;
972 static u64
hash_extent_data_ref_item(struct extent_buffer
*leaf
,
973 struct btrfs_extent_data_ref
*ref
)
975 return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf
, ref
),
976 btrfs_extent_data_ref_objectid(leaf
, ref
),
977 btrfs_extent_data_ref_offset(leaf
, ref
));
980 static int match_extent_data_ref(struct extent_buffer
*leaf
,
981 struct btrfs_extent_data_ref
*ref
,
982 u64 root_objectid
, u64 owner
, u64 offset
)
984 if (btrfs_extent_data_ref_root(leaf
, ref
) != root_objectid
||
985 btrfs_extent_data_ref_objectid(leaf
, ref
) != owner
||
986 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
991 static noinline
int lookup_extent_data_ref(struct btrfs_trans_handle
*trans
,
992 struct btrfs_root
*root
,
993 struct btrfs_path
*path
,
994 u64 bytenr
, u64 parent
,
996 u64 owner
, u64 offset
)
998 struct btrfs_key key
;
999 struct btrfs_extent_data_ref
*ref
;
1000 struct extent_buffer
*leaf
;
1006 key
.objectid
= bytenr
;
1008 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1009 key
.offset
= parent
;
1011 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1012 key
.offset
= hash_extent_data_ref(root_objectid
,
1017 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1026 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1027 key
.type
= BTRFS_EXTENT_REF_V0_KEY
;
1028 btrfs_release_path(root
, path
);
1029 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1040 leaf
= path
->nodes
[0];
1041 nritems
= btrfs_header_nritems(leaf
);
1043 if (path
->slots
[0] >= nritems
) {
1044 ret
= btrfs_next_leaf(root
, path
);
1050 leaf
= path
->nodes
[0];
1051 nritems
= btrfs_header_nritems(leaf
);
1055 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1056 if (key
.objectid
!= bytenr
||
1057 key
.type
!= BTRFS_EXTENT_DATA_REF_KEY
)
1060 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1061 struct btrfs_extent_data_ref
);
1063 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1066 btrfs_release_path(root
, path
);
1078 static noinline
int insert_extent_data_ref(struct btrfs_trans_handle
*trans
,
1079 struct btrfs_root
*root
,
1080 struct btrfs_path
*path
,
1081 u64 bytenr
, u64 parent
,
1082 u64 root_objectid
, u64 owner
,
1083 u64 offset
, int refs_to_add
)
1085 struct btrfs_key key
;
1086 struct extent_buffer
*leaf
;
1091 key
.objectid
= bytenr
;
1093 key
.type
= BTRFS_SHARED_DATA_REF_KEY
;
1094 key
.offset
= parent
;
1095 size
= sizeof(struct btrfs_shared_data_ref
);
1097 key
.type
= BTRFS_EXTENT_DATA_REF_KEY
;
1098 key
.offset
= hash_extent_data_ref(root_objectid
,
1100 size
= sizeof(struct btrfs_extent_data_ref
);
1103 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, size
);
1104 if (ret
&& ret
!= -EEXIST
)
1107 leaf
= path
->nodes
[0];
1109 struct btrfs_shared_data_ref
*ref
;
1110 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1111 struct btrfs_shared_data_ref
);
1113 btrfs_set_shared_data_ref_count(leaf
, ref
, refs_to_add
);
1115 num_refs
= btrfs_shared_data_ref_count(leaf
, ref
);
1116 num_refs
+= refs_to_add
;
1117 btrfs_set_shared_data_ref_count(leaf
, ref
, num_refs
);
1120 struct btrfs_extent_data_ref
*ref
;
1121 while (ret
== -EEXIST
) {
1122 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1123 struct btrfs_extent_data_ref
);
1124 if (match_extent_data_ref(leaf
, ref
, root_objectid
,
1127 btrfs_release_path(root
, path
);
1129 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
1131 if (ret
&& ret
!= -EEXIST
)
1134 leaf
= path
->nodes
[0];
1136 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
1137 struct btrfs_extent_data_ref
);
1139 btrfs_set_extent_data_ref_root(leaf
, ref
,
1141 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
1142 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
1143 btrfs_set_extent_data_ref_count(leaf
, ref
, refs_to_add
);
1145 num_refs
= btrfs_extent_data_ref_count(leaf
, ref
);
1146 num_refs
+= refs_to_add
;
1147 btrfs_set_extent_data_ref_count(leaf
, ref
, num_refs
);
1150 btrfs_mark_buffer_dirty(leaf
);
1153 btrfs_release_path(root
, path
);
1157 static noinline
int remove_extent_data_ref(struct btrfs_trans_handle
*trans
,
1158 struct btrfs_root
*root
,
1159 struct btrfs_path
*path
,
1162 struct btrfs_key key
;
1163 struct btrfs_extent_data_ref
*ref1
= NULL
;
1164 struct btrfs_shared_data_ref
*ref2
= NULL
;
1165 struct extent_buffer
*leaf
;
1169 leaf
= path
->nodes
[0];
1170 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1172 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1173 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1174 struct btrfs_extent_data_ref
);
1175 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1176 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1177 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1178 struct btrfs_shared_data_ref
);
1179 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1180 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1181 } else if (key
.type
== BTRFS_EXTENT_REF_V0_KEY
) {
1182 struct btrfs_extent_ref_v0
*ref0
;
1183 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1184 struct btrfs_extent_ref_v0
);
1185 num_refs
= btrfs_ref_count_v0(leaf
, ref0
);
1191 BUG_ON(num_refs
< refs_to_drop
);
1192 num_refs
-= refs_to_drop
;
1194 if (num_refs
== 0) {
1195 ret
= btrfs_del_item(trans
, root
, path
);
1197 if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
)
1198 btrfs_set_extent_data_ref_count(leaf
, ref1
, num_refs
);
1199 else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
)
1200 btrfs_set_shared_data_ref_count(leaf
, ref2
, num_refs
);
1201 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1203 struct btrfs_extent_ref_v0
*ref0
;
1204 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1205 struct btrfs_extent_ref_v0
);
1206 btrfs_set_ref_count_v0(leaf
, ref0
, num_refs
);
1209 btrfs_mark_buffer_dirty(leaf
);
1214 static noinline u32
extent_data_ref_count(struct btrfs_root
*root
,
1215 struct btrfs_path
*path
,
1216 struct btrfs_extent_inline_ref
*iref
)
1218 struct btrfs_key key
;
1219 struct extent_buffer
*leaf
;
1220 struct btrfs_extent_data_ref
*ref1
;
1221 struct btrfs_shared_data_ref
*ref2
;
1224 leaf
= path
->nodes
[0];
1225 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
1227 if (btrfs_extent_inline_ref_type(leaf
, iref
) ==
1228 BTRFS_EXTENT_DATA_REF_KEY
) {
1229 ref1
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1230 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1232 ref2
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1233 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1235 } else if (key
.type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1236 ref1
= btrfs_item_ptr(leaf
, path
->slots
[0],
1237 struct btrfs_extent_data_ref
);
1238 num_refs
= btrfs_extent_data_ref_count(leaf
, ref1
);
1239 } else if (key
.type
== BTRFS_SHARED_DATA_REF_KEY
) {
1240 ref2
= btrfs_item_ptr(leaf
, path
->slots
[0],
1241 struct btrfs_shared_data_ref
);
1242 num_refs
= btrfs_shared_data_ref_count(leaf
, ref2
);
1243 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1244 } else if (key
.type
== BTRFS_EXTENT_REF_V0_KEY
) {
1245 struct btrfs_extent_ref_v0
*ref0
;
1246 ref0
= btrfs_item_ptr(leaf
, path
->slots
[0],
1247 struct btrfs_extent_ref_v0
);
1248 num_refs
= btrfs_ref_count_v0(leaf
, ref0
);
1256 static noinline
int lookup_tree_block_ref(struct btrfs_trans_handle
*trans
,
1257 struct btrfs_root
*root
,
1258 struct btrfs_path
*path
,
1259 u64 bytenr
, u64 parent
,
1262 struct btrfs_key key
;
1265 key
.objectid
= bytenr
;
1267 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1268 key
.offset
= parent
;
1270 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1271 key
.offset
= root_objectid
;
1274 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1277 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1278 if (ret
== -ENOENT
&& parent
) {
1279 btrfs_release_path(root
, path
);
1280 key
.type
= BTRFS_EXTENT_REF_V0_KEY
;
1281 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1289 static noinline
int insert_tree_block_ref(struct btrfs_trans_handle
*trans
,
1290 struct btrfs_root
*root
,
1291 struct btrfs_path
*path
,
1292 u64 bytenr
, u64 parent
,
1295 struct btrfs_key key
;
1298 key
.objectid
= bytenr
;
1300 key
.type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1301 key
.offset
= parent
;
1303 key
.type
= BTRFS_TREE_BLOCK_REF_KEY
;
1304 key
.offset
= root_objectid
;
1307 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, 0);
1308 btrfs_release_path(root
, path
);
1312 static inline int extent_ref_type(u64 parent
, u64 owner
)
1315 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1317 type
= BTRFS_SHARED_BLOCK_REF_KEY
;
1319 type
= BTRFS_TREE_BLOCK_REF_KEY
;
1322 type
= BTRFS_SHARED_DATA_REF_KEY
;
1324 type
= BTRFS_EXTENT_DATA_REF_KEY
;
1329 static int find_next_key(struct btrfs_path
*path
, int level
,
1330 struct btrfs_key
*key
)
1333 for (; level
< BTRFS_MAX_LEVEL
; level
++) {
1334 if (!path
->nodes
[level
])
1336 if (path
->slots
[level
] + 1 >=
1337 btrfs_header_nritems(path
->nodes
[level
]))
1340 btrfs_item_key_to_cpu(path
->nodes
[level
], key
,
1341 path
->slots
[level
] + 1);
1343 btrfs_node_key_to_cpu(path
->nodes
[level
], key
,
1344 path
->slots
[level
] + 1);
1351 * look for inline back ref. if back ref is found, *ref_ret is set
1352 * to the address of inline back ref, and 0 is returned.
1354 * if back ref isn't found, *ref_ret is set to the address where it
1355 * should be inserted, and -ENOENT is returned.
1357 * if insert is true and there are too many inline back refs, the path
1358 * points to the extent item, and -EAGAIN is returned.
1360 * NOTE: inline back refs are ordered in the same way that back ref
1361 * items in the tree are ordered.
1363 static noinline_for_stack
1364 int lookup_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1365 struct btrfs_root
*root
,
1366 struct btrfs_path
*path
,
1367 struct btrfs_extent_inline_ref
**ref_ret
,
1368 u64 bytenr
, u64 num_bytes
,
1369 u64 parent
, u64 root_objectid
,
1370 u64 owner
, u64 offset
, int insert
)
1372 struct btrfs_key key
;
1373 struct extent_buffer
*leaf
;
1374 struct btrfs_extent_item
*ei
;
1375 struct btrfs_extent_inline_ref
*iref
;
1386 key
.objectid
= bytenr
;
1387 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1388 key
.offset
= num_bytes
;
1390 want
= extent_ref_type(parent
, owner
);
1392 extra_size
= btrfs_extent_inline_ref_size(want
);
1393 path
->keep_locks
= 1;
1396 ret
= btrfs_search_slot(trans
, root
, &key
, path
, extra_size
, 1);
1403 leaf
= path
->nodes
[0];
1404 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1405 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1406 if (item_size
< sizeof(*ei
)) {
1411 ret
= convert_extent_item_v0(trans
, root
, path
, owner
,
1417 leaf
= path
->nodes
[0];
1418 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1421 BUG_ON(item_size
< sizeof(*ei
));
1423 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1424 flags
= btrfs_extent_flags(leaf
, ei
);
1426 ptr
= (unsigned long)(ei
+ 1);
1427 end
= (unsigned long)ei
+ item_size
;
1429 if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
) {
1430 ptr
+= sizeof(struct btrfs_tree_block_info
);
1433 BUG_ON(!(flags
& BTRFS_EXTENT_FLAG_DATA
));
1442 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1443 type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1447 ptr
+= btrfs_extent_inline_ref_size(type
);
1451 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1452 struct btrfs_extent_data_ref
*dref
;
1453 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1454 if (match_extent_data_ref(leaf
, dref
, root_objectid
,
1459 if (hash_extent_data_ref_item(leaf
, dref
) <
1460 hash_extent_data_ref(root_objectid
, owner
, offset
))
1464 ref_offset
= btrfs_extent_inline_ref_offset(leaf
, iref
);
1466 if (parent
== ref_offset
) {
1470 if (ref_offset
< parent
)
1473 if (root_objectid
== ref_offset
) {
1477 if (ref_offset
< root_objectid
)
1481 ptr
+= btrfs_extent_inline_ref_size(type
);
1483 if (err
== -ENOENT
&& insert
) {
1484 if (item_size
+ extra_size
>=
1485 BTRFS_MAX_EXTENT_ITEM_SIZE(root
)) {
1490 * To add new inline back ref, we have to make sure
1491 * there is no corresponding back ref item.
1492 * For simplicity, we just do not add new inline back
1493 * ref if there is any kind of item for this block
1495 if (find_next_key(path
, 0, &key
) == 0 &&
1496 key
.objectid
== bytenr
&&
1497 key
.type
< BTRFS_BLOCK_GROUP_ITEM_KEY
) {
1502 *ref_ret
= (struct btrfs_extent_inline_ref
*)ptr
;
1505 path
->keep_locks
= 0;
1506 btrfs_unlock_up_safe(path
, 1);
1512 * helper to add new inline back ref
1514 static noinline_for_stack
1515 int setup_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1516 struct btrfs_root
*root
,
1517 struct btrfs_path
*path
,
1518 struct btrfs_extent_inline_ref
*iref
,
1519 u64 parent
, u64 root_objectid
,
1520 u64 owner
, u64 offset
, int refs_to_add
,
1521 struct btrfs_delayed_extent_op
*extent_op
)
1523 struct extent_buffer
*leaf
;
1524 struct btrfs_extent_item
*ei
;
1527 unsigned long item_offset
;
1533 leaf
= path
->nodes
[0];
1534 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1535 item_offset
= (unsigned long)iref
- (unsigned long)ei
;
1537 type
= extent_ref_type(parent
, owner
);
1538 size
= btrfs_extent_inline_ref_size(type
);
1540 ret
= btrfs_extend_item(trans
, root
, path
, size
);
1543 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1544 refs
= btrfs_extent_refs(leaf
, ei
);
1545 refs
+= refs_to_add
;
1546 btrfs_set_extent_refs(leaf
, ei
, refs
);
1548 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1550 ptr
= (unsigned long)ei
+ item_offset
;
1551 end
= (unsigned long)ei
+ btrfs_item_size_nr(leaf
, path
->slots
[0]);
1552 if (ptr
< end
- size
)
1553 memmove_extent_buffer(leaf
, ptr
+ size
, ptr
,
1556 iref
= (struct btrfs_extent_inline_ref
*)ptr
;
1557 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
1558 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1559 struct btrfs_extent_data_ref
*dref
;
1560 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1561 btrfs_set_extent_data_ref_root(leaf
, dref
, root_objectid
);
1562 btrfs_set_extent_data_ref_objectid(leaf
, dref
, owner
);
1563 btrfs_set_extent_data_ref_offset(leaf
, dref
, offset
);
1564 btrfs_set_extent_data_ref_count(leaf
, dref
, refs_to_add
);
1565 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1566 struct btrfs_shared_data_ref
*sref
;
1567 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1568 btrfs_set_shared_data_ref_count(leaf
, sref
, refs_to_add
);
1569 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1570 } else if (type
== BTRFS_SHARED_BLOCK_REF_KEY
) {
1571 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
1573 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
1575 btrfs_mark_buffer_dirty(leaf
);
1579 static int lookup_extent_backref(struct btrfs_trans_handle
*trans
,
1580 struct btrfs_root
*root
,
1581 struct btrfs_path
*path
,
1582 struct btrfs_extent_inline_ref
**ref_ret
,
1583 u64 bytenr
, u64 num_bytes
, u64 parent
,
1584 u64 root_objectid
, u64 owner
, u64 offset
)
1588 ret
= lookup_inline_extent_backref(trans
, root
, path
, ref_ret
,
1589 bytenr
, num_bytes
, parent
,
1590 root_objectid
, owner
, offset
, 0);
1594 btrfs_release_path(root
, path
);
1597 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1598 ret
= lookup_tree_block_ref(trans
, root
, path
, bytenr
, parent
,
1601 ret
= lookup_extent_data_ref(trans
, root
, path
, bytenr
, parent
,
1602 root_objectid
, owner
, offset
);
1608 * helper to update/remove inline back ref
1610 static noinline_for_stack
1611 int update_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1612 struct btrfs_root
*root
,
1613 struct btrfs_path
*path
,
1614 struct btrfs_extent_inline_ref
*iref
,
1616 struct btrfs_delayed_extent_op
*extent_op
)
1618 struct extent_buffer
*leaf
;
1619 struct btrfs_extent_item
*ei
;
1620 struct btrfs_extent_data_ref
*dref
= NULL
;
1621 struct btrfs_shared_data_ref
*sref
= NULL
;
1630 leaf
= path
->nodes
[0];
1631 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1632 refs
= btrfs_extent_refs(leaf
, ei
);
1633 WARN_ON(refs_to_mod
< 0 && refs
+ refs_to_mod
<= 0);
1634 refs
+= refs_to_mod
;
1635 btrfs_set_extent_refs(leaf
, ei
, refs
);
1637 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1639 type
= btrfs_extent_inline_ref_type(leaf
, iref
);
1641 if (type
== BTRFS_EXTENT_DATA_REF_KEY
) {
1642 dref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
1643 refs
= btrfs_extent_data_ref_count(leaf
, dref
);
1644 } else if (type
== BTRFS_SHARED_DATA_REF_KEY
) {
1645 sref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
1646 refs
= btrfs_shared_data_ref_count(leaf
, sref
);
1649 BUG_ON(refs_to_mod
!= -1);
1652 BUG_ON(refs_to_mod
< 0 && refs
< -refs_to_mod
);
1653 refs
+= refs_to_mod
;
1656 if (type
== BTRFS_EXTENT_DATA_REF_KEY
)
1657 btrfs_set_extent_data_ref_count(leaf
, dref
, refs
);
1659 btrfs_set_shared_data_ref_count(leaf
, sref
, refs
);
1661 size
= btrfs_extent_inline_ref_size(type
);
1662 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1663 ptr
= (unsigned long)iref
;
1664 end
= (unsigned long)ei
+ item_size
;
1665 if (ptr
+ size
< end
)
1666 memmove_extent_buffer(leaf
, ptr
, ptr
+ size
,
1669 ret
= btrfs_truncate_item(trans
, root
, path
, item_size
, 1);
1672 btrfs_mark_buffer_dirty(leaf
);
1676 static noinline_for_stack
1677 int insert_inline_extent_backref(struct btrfs_trans_handle
*trans
,
1678 struct btrfs_root
*root
,
1679 struct btrfs_path
*path
,
1680 u64 bytenr
, u64 num_bytes
, u64 parent
,
1681 u64 root_objectid
, u64 owner
,
1682 u64 offset
, int refs_to_add
,
1683 struct btrfs_delayed_extent_op
*extent_op
)
1685 struct btrfs_extent_inline_ref
*iref
;
1688 ret
= lookup_inline_extent_backref(trans
, root
, path
, &iref
,
1689 bytenr
, num_bytes
, parent
,
1690 root_objectid
, owner
, offset
, 1);
1692 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
);
1693 ret
= update_inline_extent_backref(trans
, root
, path
, iref
,
1694 refs_to_add
, extent_op
);
1695 } else if (ret
== -ENOENT
) {
1696 ret
= setup_inline_extent_backref(trans
, root
, path
, iref
,
1697 parent
, root_objectid
,
1698 owner
, offset
, refs_to_add
,
1704 static int insert_extent_backref(struct btrfs_trans_handle
*trans
,
1705 struct btrfs_root
*root
,
1706 struct btrfs_path
*path
,
1707 u64 bytenr
, u64 parent
, u64 root_objectid
,
1708 u64 owner
, u64 offset
, int refs_to_add
)
1711 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1712 BUG_ON(refs_to_add
!= 1);
1713 ret
= insert_tree_block_ref(trans
, root
, path
, bytenr
,
1714 parent
, root_objectid
);
1716 ret
= insert_extent_data_ref(trans
, root
, path
, bytenr
,
1717 parent
, root_objectid
,
1718 owner
, offset
, refs_to_add
);
1723 static int remove_extent_backref(struct btrfs_trans_handle
*trans
,
1724 struct btrfs_root
*root
,
1725 struct btrfs_path
*path
,
1726 struct btrfs_extent_inline_ref
*iref
,
1727 int refs_to_drop
, int is_data
)
1731 BUG_ON(!is_data
&& refs_to_drop
!= 1);
1733 ret
= update_inline_extent_backref(trans
, root
, path
, iref
,
1734 -refs_to_drop
, NULL
);
1735 } else if (is_data
) {
1736 ret
= remove_extent_data_ref(trans
, root
, path
, refs_to_drop
);
1738 ret
= btrfs_del_item(trans
, root
, path
);
1743 static void btrfs_issue_discard(struct block_device
*bdev
,
1746 blkdev_issue_discard(bdev
, start
>> 9, len
>> 9, GFP_KERNEL
, 0);
1749 static int btrfs_discard_extent(struct btrfs_root
*root
, u64 bytenr
,
1753 u64 map_length
= num_bytes
;
1754 struct btrfs_multi_bio
*multi
= NULL
;
1756 if (!btrfs_test_opt(root
, DISCARD
))
1759 /* Tell the block device(s) that the sectors can be discarded */
1760 ret
= btrfs_map_block(&root
->fs_info
->mapping_tree
, READ
,
1761 bytenr
, &map_length
, &multi
, 0);
1763 struct btrfs_bio_stripe
*stripe
= multi
->stripes
;
1766 if (map_length
> num_bytes
)
1767 map_length
= num_bytes
;
1769 for (i
= 0; i
< multi
->num_stripes
; i
++, stripe
++) {
1770 btrfs_issue_discard(stripe
->dev
->bdev
,
1780 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1781 struct btrfs_root
*root
,
1782 u64 bytenr
, u64 num_bytes
, u64 parent
,
1783 u64 root_objectid
, u64 owner
, u64 offset
)
1786 BUG_ON(owner
< BTRFS_FIRST_FREE_OBJECTID
&&
1787 root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
1789 if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
1790 ret
= btrfs_add_delayed_tree_ref(trans
, bytenr
, num_bytes
,
1791 parent
, root_objectid
, (int)owner
,
1792 BTRFS_ADD_DELAYED_REF
, NULL
);
1794 ret
= btrfs_add_delayed_data_ref(trans
, bytenr
, num_bytes
,
1795 parent
, root_objectid
, owner
, offset
,
1796 BTRFS_ADD_DELAYED_REF
, NULL
);
1801 static int __btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1802 struct btrfs_root
*root
,
1803 u64 bytenr
, u64 num_bytes
,
1804 u64 parent
, u64 root_objectid
,
1805 u64 owner
, u64 offset
, int refs_to_add
,
1806 struct btrfs_delayed_extent_op
*extent_op
)
1808 struct btrfs_path
*path
;
1809 struct extent_buffer
*leaf
;
1810 struct btrfs_extent_item
*item
;
1815 path
= btrfs_alloc_path();
1820 path
->leave_spinning
= 1;
1821 /* this will setup the path even if it fails to insert the back ref */
1822 ret
= insert_inline_extent_backref(trans
, root
->fs_info
->extent_root
,
1823 path
, bytenr
, num_bytes
, parent
,
1824 root_objectid
, owner
, offset
,
1825 refs_to_add
, extent_op
);
1829 if (ret
!= -EAGAIN
) {
1834 leaf
= path
->nodes
[0];
1835 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1836 refs
= btrfs_extent_refs(leaf
, item
);
1837 btrfs_set_extent_refs(leaf
, item
, refs
+ refs_to_add
);
1839 __run_delayed_extent_op(extent_op
, leaf
, item
);
1841 btrfs_mark_buffer_dirty(leaf
);
1842 btrfs_release_path(root
->fs_info
->extent_root
, path
);
1845 path
->leave_spinning
= 1;
1847 /* now insert the actual backref */
1848 ret
= insert_extent_backref(trans
, root
->fs_info
->extent_root
,
1849 path
, bytenr
, parent
, root_objectid
,
1850 owner
, offset
, refs_to_add
);
1853 btrfs_free_path(path
);
1857 static int run_delayed_data_ref(struct btrfs_trans_handle
*trans
,
1858 struct btrfs_root
*root
,
1859 struct btrfs_delayed_ref_node
*node
,
1860 struct btrfs_delayed_extent_op
*extent_op
,
1861 int insert_reserved
)
1864 struct btrfs_delayed_data_ref
*ref
;
1865 struct btrfs_key ins
;
1870 ins
.objectid
= node
->bytenr
;
1871 ins
.offset
= node
->num_bytes
;
1872 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
1874 ref
= btrfs_delayed_node_to_data_ref(node
);
1875 if (node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
1876 parent
= ref
->parent
;
1878 ref_root
= ref
->root
;
1880 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
1882 BUG_ON(extent_op
->update_key
);
1883 flags
|= extent_op
->flags_to_set
;
1885 ret
= alloc_reserved_file_extent(trans
, root
,
1886 parent
, ref_root
, flags
,
1887 ref
->objectid
, ref
->offset
,
1888 &ins
, node
->ref_mod
);
1889 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
1890 ret
= __btrfs_inc_extent_ref(trans
, root
, node
->bytenr
,
1891 node
->num_bytes
, parent
,
1892 ref_root
, ref
->objectid
,
1893 ref
->offset
, node
->ref_mod
,
1895 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
1896 ret
= __btrfs_free_extent(trans
, root
, node
->bytenr
,
1897 node
->num_bytes
, parent
,
1898 ref_root
, ref
->objectid
,
1899 ref
->offset
, node
->ref_mod
,
1907 static void __run_delayed_extent_op(struct btrfs_delayed_extent_op
*extent_op
,
1908 struct extent_buffer
*leaf
,
1909 struct btrfs_extent_item
*ei
)
1911 u64 flags
= btrfs_extent_flags(leaf
, ei
);
1912 if (extent_op
->update_flags
) {
1913 flags
|= extent_op
->flags_to_set
;
1914 btrfs_set_extent_flags(leaf
, ei
, flags
);
1917 if (extent_op
->update_key
) {
1918 struct btrfs_tree_block_info
*bi
;
1919 BUG_ON(!(flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
));
1920 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
1921 btrfs_set_tree_block_key(leaf
, bi
, &extent_op
->key
);
1925 static int run_delayed_extent_op(struct btrfs_trans_handle
*trans
,
1926 struct btrfs_root
*root
,
1927 struct btrfs_delayed_ref_node
*node
,
1928 struct btrfs_delayed_extent_op
*extent_op
)
1930 struct btrfs_key key
;
1931 struct btrfs_path
*path
;
1932 struct btrfs_extent_item
*ei
;
1933 struct extent_buffer
*leaf
;
1938 path
= btrfs_alloc_path();
1942 key
.objectid
= node
->bytenr
;
1943 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
1944 key
.offset
= node
->num_bytes
;
1947 path
->leave_spinning
= 1;
1948 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
, &key
,
1959 leaf
= path
->nodes
[0];
1960 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1961 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1962 if (item_size
< sizeof(*ei
)) {
1963 ret
= convert_extent_item_v0(trans
, root
->fs_info
->extent_root
,
1969 leaf
= path
->nodes
[0];
1970 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
1973 BUG_ON(item_size
< sizeof(*ei
));
1974 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
1975 __run_delayed_extent_op(extent_op
, leaf
, ei
);
1977 btrfs_mark_buffer_dirty(leaf
);
1979 btrfs_free_path(path
);
1983 static int run_delayed_tree_ref(struct btrfs_trans_handle
*trans
,
1984 struct btrfs_root
*root
,
1985 struct btrfs_delayed_ref_node
*node
,
1986 struct btrfs_delayed_extent_op
*extent_op
,
1987 int insert_reserved
)
1990 struct btrfs_delayed_tree_ref
*ref
;
1991 struct btrfs_key ins
;
1995 ins
.objectid
= node
->bytenr
;
1996 ins
.offset
= node
->num_bytes
;
1997 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
1999 ref
= btrfs_delayed_node_to_tree_ref(node
);
2000 if (node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2001 parent
= ref
->parent
;
2003 ref_root
= ref
->root
;
2005 BUG_ON(node
->ref_mod
!= 1);
2006 if (node
->action
== BTRFS_ADD_DELAYED_REF
&& insert_reserved
) {
2007 BUG_ON(!extent_op
|| !extent_op
->update_flags
||
2008 !extent_op
->update_key
);
2009 ret
= alloc_reserved_tree_block(trans
, root
,
2011 extent_op
->flags_to_set
,
2014 } else if (node
->action
== BTRFS_ADD_DELAYED_REF
) {
2015 ret
= __btrfs_inc_extent_ref(trans
, root
, node
->bytenr
,
2016 node
->num_bytes
, parent
, ref_root
,
2017 ref
->level
, 0, 1, extent_op
);
2018 } else if (node
->action
== BTRFS_DROP_DELAYED_REF
) {
2019 ret
= __btrfs_free_extent(trans
, root
, node
->bytenr
,
2020 node
->num_bytes
, parent
, ref_root
,
2021 ref
->level
, 0, 1, extent_op
);
2028 /* helper function to actually process a single delayed ref entry */
2029 static int run_one_delayed_ref(struct btrfs_trans_handle
*trans
,
2030 struct btrfs_root
*root
,
2031 struct btrfs_delayed_ref_node
*node
,
2032 struct btrfs_delayed_extent_op
*extent_op
,
2033 int insert_reserved
)
2036 if (btrfs_delayed_ref_is_head(node
)) {
2037 struct btrfs_delayed_ref_head
*head
;
2039 * we've hit the end of the chain and we were supposed
2040 * to insert this extent into the tree. But, it got
2041 * deleted before we ever needed to insert it, so all
2042 * we have to do is clean up the accounting
2045 head
= btrfs_delayed_node_to_head(node
);
2046 if (insert_reserved
) {
2047 btrfs_pin_extent(root
, node
->bytenr
,
2048 node
->num_bytes
, 1);
2049 if (head
->is_data
) {
2050 ret
= btrfs_del_csums(trans
, root
,
2056 mutex_unlock(&head
->mutex
);
2060 if (node
->type
== BTRFS_TREE_BLOCK_REF_KEY
||
2061 node
->type
== BTRFS_SHARED_BLOCK_REF_KEY
)
2062 ret
= run_delayed_tree_ref(trans
, root
, node
, extent_op
,
2064 else if (node
->type
== BTRFS_EXTENT_DATA_REF_KEY
||
2065 node
->type
== BTRFS_SHARED_DATA_REF_KEY
)
2066 ret
= run_delayed_data_ref(trans
, root
, node
, extent_op
,
2073 static noinline
struct btrfs_delayed_ref_node
*
2074 select_delayed_ref(struct btrfs_delayed_ref_head
*head
)
2076 struct rb_node
*node
;
2077 struct btrfs_delayed_ref_node
*ref
;
2078 int action
= BTRFS_ADD_DELAYED_REF
;
2081 * select delayed ref of type BTRFS_ADD_DELAYED_REF first.
2082 * this prevents ref count from going down to zero when
2083 * there still are pending delayed ref.
2085 node
= rb_prev(&head
->node
.rb_node
);
2089 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
,
2091 if (ref
->bytenr
!= head
->node
.bytenr
)
2093 if (ref
->action
== action
)
2095 node
= rb_prev(node
);
2097 if (action
== BTRFS_ADD_DELAYED_REF
) {
2098 action
= BTRFS_DROP_DELAYED_REF
;
2104 static noinline
int run_clustered_refs(struct btrfs_trans_handle
*trans
,
2105 struct btrfs_root
*root
,
2106 struct list_head
*cluster
)
2108 struct btrfs_delayed_ref_root
*delayed_refs
;
2109 struct btrfs_delayed_ref_node
*ref
;
2110 struct btrfs_delayed_ref_head
*locked_ref
= NULL
;
2111 struct btrfs_delayed_extent_op
*extent_op
;
2114 int must_insert_reserved
= 0;
2116 delayed_refs
= &trans
->transaction
->delayed_refs
;
2119 /* pick a new head ref from the cluster list */
2120 if (list_empty(cluster
))
2123 locked_ref
= list_entry(cluster
->next
,
2124 struct btrfs_delayed_ref_head
, cluster
);
2126 /* grab the lock that says we are going to process
2127 * all the refs for this head */
2128 ret
= btrfs_delayed_ref_lock(trans
, locked_ref
);
2131 * we may have dropped the spin lock to get the head
2132 * mutex lock, and that might have given someone else
2133 * time to free the head. If that's true, it has been
2134 * removed from our list and we can move on.
2136 if (ret
== -EAGAIN
) {
2144 * record the must insert reserved flag before we
2145 * drop the spin lock.
2147 must_insert_reserved
= locked_ref
->must_insert_reserved
;
2148 locked_ref
->must_insert_reserved
= 0;
2150 extent_op
= locked_ref
->extent_op
;
2151 locked_ref
->extent_op
= NULL
;
2154 * locked_ref is the head node, so we have to go one
2155 * node back for any delayed ref updates
2157 ref
= select_delayed_ref(locked_ref
);
2159 /* All delayed refs have been processed, Go ahead
2160 * and send the head node to run_one_delayed_ref,
2161 * so that any accounting fixes can happen
2163 ref
= &locked_ref
->node
;
2165 if (extent_op
&& must_insert_reserved
) {
2171 spin_unlock(&delayed_refs
->lock
);
2173 ret
= run_delayed_extent_op(trans
, root
,
2179 spin_lock(&delayed_refs
->lock
);
2183 list_del_init(&locked_ref
->cluster
);
2188 rb_erase(&ref
->rb_node
, &delayed_refs
->root
);
2189 delayed_refs
->num_entries
--;
2191 spin_unlock(&delayed_refs
->lock
);
2193 ret
= run_one_delayed_ref(trans
, root
, ref
, extent_op
,
2194 must_insert_reserved
);
2197 btrfs_put_delayed_ref(ref
);
2202 spin_lock(&delayed_refs
->lock
);
2208 * this starts processing the delayed reference count updates and
2209 * extent insertions we have queued up so far. count can be
2210 * 0, which means to process everything in the tree at the start
2211 * of the run (but not newly added entries), or it can be some target
2212 * number you'd like to process.
2214 int btrfs_run_delayed_refs(struct btrfs_trans_handle
*trans
,
2215 struct btrfs_root
*root
, unsigned long count
)
2217 struct rb_node
*node
;
2218 struct btrfs_delayed_ref_root
*delayed_refs
;
2219 struct btrfs_delayed_ref_node
*ref
;
2220 struct list_head cluster
;
2222 int run_all
= count
== (unsigned long)-1;
2225 if (root
== root
->fs_info
->extent_root
)
2226 root
= root
->fs_info
->tree_root
;
2228 delayed_refs
= &trans
->transaction
->delayed_refs
;
2229 INIT_LIST_HEAD(&cluster
);
2231 spin_lock(&delayed_refs
->lock
);
2233 count
= delayed_refs
->num_entries
* 2;
2237 if (!(run_all
|| run_most
) &&
2238 delayed_refs
->num_heads_ready
< 64)
2242 * go find something we can process in the rbtree. We start at
2243 * the beginning of the tree, and then build a cluster
2244 * of refs to process starting at the first one we are able to
2247 ret
= btrfs_find_ref_cluster(trans
, &cluster
,
2248 delayed_refs
->run_delayed_start
);
2252 ret
= run_clustered_refs(trans
, root
, &cluster
);
2255 count
-= min_t(unsigned long, ret
, count
);
2262 node
= rb_first(&delayed_refs
->root
);
2265 count
= (unsigned long)-1;
2268 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
,
2270 if (btrfs_delayed_ref_is_head(ref
)) {
2271 struct btrfs_delayed_ref_head
*head
;
2273 head
= btrfs_delayed_node_to_head(ref
);
2274 atomic_inc(&ref
->refs
);
2276 spin_unlock(&delayed_refs
->lock
);
2277 mutex_lock(&head
->mutex
);
2278 mutex_unlock(&head
->mutex
);
2280 btrfs_put_delayed_ref(ref
);
2284 node
= rb_next(node
);
2286 spin_unlock(&delayed_refs
->lock
);
2287 schedule_timeout(1);
2291 spin_unlock(&delayed_refs
->lock
);
2295 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle
*trans
,
2296 struct btrfs_root
*root
,
2297 u64 bytenr
, u64 num_bytes
, u64 flags
,
2300 struct btrfs_delayed_extent_op
*extent_op
;
2303 extent_op
= kmalloc(sizeof(*extent_op
), GFP_NOFS
);
2307 extent_op
->flags_to_set
= flags
;
2308 extent_op
->update_flags
= 1;
2309 extent_op
->update_key
= 0;
2310 extent_op
->is_data
= is_data
? 1 : 0;
2312 ret
= btrfs_add_delayed_extent_op(trans
, bytenr
, num_bytes
, extent_op
);
2318 static noinline
int check_delayed_ref(struct btrfs_trans_handle
*trans
,
2319 struct btrfs_root
*root
,
2320 struct btrfs_path
*path
,
2321 u64 objectid
, u64 offset
, u64 bytenr
)
2323 struct btrfs_delayed_ref_head
*head
;
2324 struct btrfs_delayed_ref_node
*ref
;
2325 struct btrfs_delayed_data_ref
*data_ref
;
2326 struct btrfs_delayed_ref_root
*delayed_refs
;
2327 struct rb_node
*node
;
2331 delayed_refs
= &trans
->transaction
->delayed_refs
;
2332 spin_lock(&delayed_refs
->lock
);
2333 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
2337 if (!mutex_trylock(&head
->mutex
)) {
2338 atomic_inc(&head
->node
.refs
);
2339 spin_unlock(&delayed_refs
->lock
);
2341 btrfs_release_path(root
->fs_info
->extent_root
, path
);
2343 mutex_lock(&head
->mutex
);
2344 mutex_unlock(&head
->mutex
);
2345 btrfs_put_delayed_ref(&head
->node
);
2349 node
= rb_prev(&head
->node
.rb_node
);
2353 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
, rb_node
);
2355 if (ref
->bytenr
!= bytenr
)
2359 if (ref
->type
!= BTRFS_EXTENT_DATA_REF_KEY
)
2362 data_ref
= btrfs_delayed_node_to_data_ref(ref
);
2364 node
= rb_prev(node
);
2366 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
, rb_node
);
2367 if (ref
->bytenr
== bytenr
)
2371 if (data_ref
->root
!= root
->root_key
.objectid
||
2372 data_ref
->objectid
!= objectid
|| data_ref
->offset
!= offset
)
2377 mutex_unlock(&head
->mutex
);
2379 spin_unlock(&delayed_refs
->lock
);
2383 static noinline
int check_committed_ref(struct btrfs_trans_handle
*trans
,
2384 struct btrfs_root
*root
,
2385 struct btrfs_path
*path
,
2386 u64 objectid
, u64 offset
, u64 bytenr
)
2388 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
2389 struct extent_buffer
*leaf
;
2390 struct btrfs_extent_data_ref
*ref
;
2391 struct btrfs_extent_inline_ref
*iref
;
2392 struct btrfs_extent_item
*ei
;
2393 struct btrfs_key key
;
2397 key
.objectid
= bytenr
;
2398 key
.offset
= (u64
)-1;
2399 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2401 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
2407 if (path
->slots
[0] == 0)
2411 leaf
= path
->nodes
[0];
2412 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
2414 if (key
.objectid
!= bytenr
|| key
.type
!= BTRFS_EXTENT_ITEM_KEY
)
2418 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2419 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
2420 if (item_size
< sizeof(*ei
)) {
2421 WARN_ON(item_size
!= sizeof(struct btrfs_extent_item_v0
));
2425 ei
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_extent_item
);
2427 if (item_size
!= sizeof(*ei
) +
2428 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY
))
2431 if (btrfs_extent_generation(leaf
, ei
) <=
2432 btrfs_root_last_snapshot(&root
->root_item
))
2435 iref
= (struct btrfs_extent_inline_ref
*)(ei
+ 1);
2436 if (btrfs_extent_inline_ref_type(leaf
, iref
) !=
2437 BTRFS_EXTENT_DATA_REF_KEY
)
2440 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
2441 if (btrfs_extent_refs(leaf
, ei
) !=
2442 btrfs_extent_data_ref_count(leaf
, ref
) ||
2443 btrfs_extent_data_ref_root(leaf
, ref
) !=
2444 root
->root_key
.objectid
||
2445 btrfs_extent_data_ref_objectid(leaf
, ref
) != objectid
||
2446 btrfs_extent_data_ref_offset(leaf
, ref
) != offset
)
2454 int btrfs_cross_ref_exist(struct btrfs_trans_handle
*trans
,
2455 struct btrfs_root
*root
,
2456 u64 objectid
, u64 offset
, u64 bytenr
)
2458 struct btrfs_path
*path
;
2462 path
= btrfs_alloc_path();
2467 ret
= check_committed_ref(trans
, root
, path
, objectid
,
2469 if (ret
&& ret
!= -ENOENT
)
2472 ret2
= check_delayed_ref(trans
, root
, path
, objectid
,
2474 } while (ret2
== -EAGAIN
);
2476 if (ret2
&& ret2
!= -ENOENT
) {
2481 if (ret
!= -ENOENT
|| ret2
!= -ENOENT
)
2484 btrfs_free_path(path
);
2485 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
2491 int btrfs_cache_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
2492 struct extent_buffer
*buf
, u32 nr_extents
)
2494 struct btrfs_key key
;
2495 struct btrfs_file_extent_item
*fi
;
2503 if (!root
->ref_cows
)
2506 if (root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
) {
2508 root_gen
= root
->root_key
.offset
;
2511 root_gen
= trans
->transid
- 1;
2514 level
= btrfs_header_level(buf
);
2515 nritems
= btrfs_header_nritems(buf
);
2518 struct btrfs_leaf_ref
*ref
;
2519 struct btrfs_extent_info
*info
;
2521 ref
= btrfs_alloc_leaf_ref(root
, nr_extents
);
2527 ref
->root_gen
= root_gen
;
2528 ref
->bytenr
= buf
->start
;
2529 ref
->owner
= btrfs_header_owner(buf
);
2530 ref
->generation
= btrfs_header_generation(buf
);
2531 ref
->nritems
= nr_extents
;
2532 info
= ref
->extents
;
2534 for (i
= 0; nr_extents
> 0 && i
< nritems
; i
++) {
2536 btrfs_item_key_to_cpu(buf
, &key
, i
);
2537 if (btrfs_key_type(&key
) != BTRFS_EXTENT_DATA_KEY
)
2539 fi
= btrfs_item_ptr(buf
, i
,
2540 struct btrfs_file_extent_item
);
2541 if (btrfs_file_extent_type(buf
, fi
) ==
2542 BTRFS_FILE_EXTENT_INLINE
)
2544 disk_bytenr
= btrfs_file_extent_disk_bytenr(buf
, fi
);
2545 if (disk_bytenr
== 0)
2548 info
->bytenr
= disk_bytenr
;
2550 btrfs_file_extent_disk_num_bytes(buf
, fi
);
2551 info
->objectid
= key
.objectid
;
2552 info
->offset
= key
.offset
;
2556 ret
= btrfs_add_leaf_ref(root
, ref
, shared
);
2557 if (ret
== -EEXIST
&& shared
) {
2558 struct btrfs_leaf_ref
*old
;
2559 old
= btrfs_lookup_leaf_ref(root
, ref
->bytenr
);
2561 btrfs_remove_leaf_ref(root
, old
);
2562 btrfs_free_leaf_ref(root
, old
);
2563 ret
= btrfs_add_leaf_ref(root
, ref
, shared
);
2566 btrfs_free_leaf_ref(root
, ref
);
2572 /* when a block goes through cow, we update the reference counts of
2573 * everything that block points to. The internal pointers of the block
2574 * can be in just about any order, and it is likely to have clusters of
2575 * things that are close together and clusters of things that are not.
2577 * To help reduce the seeks that come with updating all of these reference
2578 * counts, sort them by byte number before actual updates are done.
2580 * struct refsort is used to match byte number to slot in the btree block.
2581 * we sort based on the byte number and then use the slot to actually
2584 * struct refsort is smaller than strcut btrfs_item and smaller than
2585 * struct btrfs_key_ptr. Since we're currently limited to the page size
2586 * for a btree block, there's no way for a kmalloc of refsorts for a
2587 * single node to be bigger than a page.
2595 * for passing into sort()
2597 static int refsort_cmp(const void *a_void
, const void *b_void
)
2599 const struct refsort
*a
= a_void
;
2600 const struct refsort
*b
= b_void
;
2602 if (a
->bytenr
< b
->bytenr
)
2604 if (a
->bytenr
> b
->bytenr
)
2610 static int __btrfs_mod_ref(struct btrfs_trans_handle
*trans
,
2611 struct btrfs_root
*root
,
2612 struct extent_buffer
*buf
,
2613 int full_backref
, int inc
)
2620 struct btrfs_key key
;
2621 struct btrfs_file_extent_item
*fi
;
2625 int (*process_func
)(struct btrfs_trans_handle
*, struct btrfs_root
*,
2626 u64
, u64
, u64
, u64
, u64
, u64
);
2628 ref_root
= btrfs_header_owner(buf
);
2629 nritems
= btrfs_header_nritems(buf
);
2630 level
= btrfs_header_level(buf
);
2632 if (!root
->ref_cows
&& level
== 0)
2636 process_func
= btrfs_inc_extent_ref
;
2638 process_func
= btrfs_free_extent
;
2641 parent
= buf
->start
;
2645 for (i
= 0; i
< nritems
; i
++) {
2647 btrfs_item_key_to_cpu(buf
, &key
, i
);
2648 if (btrfs_key_type(&key
) != BTRFS_EXTENT_DATA_KEY
)
2650 fi
= btrfs_item_ptr(buf
, i
,
2651 struct btrfs_file_extent_item
);
2652 if (btrfs_file_extent_type(buf
, fi
) ==
2653 BTRFS_FILE_EXTENT_INLINE
)
2655 bytenr
= btrfs_file_extent_disk_bytenr(buf
, fi
);
2659 num_bytes
= btrfs_file_extent_disk_num_bytes(buf
, fi
);
2660 key
.offset
-= btrfs_file_extent_offset(buf
, fi
);
2661 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
2662 parent
, ref_root
, key
.objectid
,
2667 bytenr
= btrfs_node_blockptr(buf
, i
);
2668 num_bytes
= btrfs_level_size(root
, level
- 1);
2669 ret
= process_func(trans
, root
, bytenr
, num_bytes
,
2670 parent
, ref_root
, level
- 1, 0);
2681 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
2682 struct extent_buffer
*buf
, int full_backref
)
2684 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 1);
2687 int btrfs_dec_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
2688 struct extent_buffer
*buf
, int full_backref
)
2690 return __btrfs_mod_ref(trans
, root
, buf
, full_backref
, 0);
2693 static int write_one_cache_group(struct btrfs_trans_handle
*trans
,
2694 struct btrfs_root
*root
,
2695 struct btrfs_path
*path
,
2696 struct btrfs_block_group_cache
*cache
)
2699 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
2701 struct extent_buffer
*leaf
;
2703 ret
= btrfs_search_slot(trans
, extent_root
, &cache
->key
, path
, 0, 1);
2708 leaf
= path
->nodes
[0];
2709 bi
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
2710 write_extent_buffer(leaf
, &cache
->item
, bi
, sizeof(cache
->item
));
2711 btrfs_mark_buffer_dirty(leaf
);
2712 btrfs_release_path(extent_root
, path
);
2720 static struct btrfs_block_group_cache
*
2721 next_block_group(struct btrfs_root
*root
,
2722 struct btrfs_block_group_cache
*cache
)
2724 struct rb_node
*node
;
2725 spin_lock(&root
->fs_info
->block_group_cache_lock
);
2726 node
= rb_next(&cache
->cache_node
);
2727 btrfs_put_block_group(cache
);
2729 cache
= rb_entry(node
, struct btrfs_block_group_cache
,
2731 btrfs_get_block_group(cache
);
2734 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
2738 static int cache_save_setup(struct btrfs_block_group_cache
*block_group
,
2739 struct btrfs_trans_handle
*trans
,
2740 struct btrfs_path
*path
)
2742 struct btrfs_root
*root
= block_group
->fs_info
->tree_root
;
2743 struct inode
*inode
= NULL
;
2745 int dcs
= BTRFS_DC_ERROR
;
2751 * If this block group is smaller than 100 megs don't bother caching the
2754 if (block_group
->key
.offset
< (100 * 1024 * 1024)) {
2755 spin_lock(&block_group
->lock
);
2756 block_group
->disk_cache_state
= BTRFS_DC_WRITTEN
;
2757 spin_unlock(&block_group
->lock
);
2762 inode
= lookup_free_space_inode(root
, block_group
, path
);
2763 if (IS_ERR(inode
) && PTR_ERR(inode
) != -ENOENT
) {
2764 ret
= PTR_ERR(inode
);
2765 btrfs_release_path(root
, path
);
2769 if (IS_ERR(inode
)) {
2773 if (block_group
->ro
)
2776 ret
= create_free_space_inode(root
, trans
, block_group
, path
);
2783 * We want to set the generation to 0, that way if anything goes wrong
2784 * from here on out we know not to trust this cache when we load up next
2787 BTRFS_I(inode
)->generation
= 0;
2788 ret
= btrfs_update_inode(trans
, root
, inode
);
2791 if (i_size_read(inode
) > 0) {
2792 ret
= btrfs_truncate_free_space_cache(root
, trans
, path
,
2798 spin_lock(&block_group
->lock
);
2799 if (block_group
->cached
!= BTRFS_CACHE_FINISHED
) {
2800 /* We're not cached, don't bother trying to write stuff out */
2801 dcs
= BTRFS_DC_WRITTEN
;
2802 spin_unlock(&block_group
->lock
);
2805 spin_unlock(&block_group
->lock
);
2807 num_pages
= (int)div64_u64(block_group
->key
.offset
, 1024 * 1024 * 1024);
2812 * Just to make absolutely sure we have enough space, we're going to
2813 * preallocate 12 pages worth of space for each block group. In
2814 * practice we ought to use at most 8, but we need extra space so we can
2815 * add our header and have a terminator between the extents and the
2819 num_pages
*= PAGE_CACHE_SIZE
;
2821 ret
= btrfs_check_data_free_space(inode
, num_pages
);
2825 ret
= btrfs_prealloc_file_range_trans(inode
, trans
, 0, 0, num_pages
,
2826 num_pages
, num_pages
,
2829 dcs
= BTRFS_DC_SETUP
;
2830 btrfs_free_reserved_data_space(inode
, num_pages
);
2834 btrfs_release_path(root
, path
);
2836 spin_lock(&block_group
->lock
);
2837 block_group
->disk_cache_state
= dcs
;
2838 spin_unlock(&block_group
->lock
);
2843 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
2844 struct btrfs_root
*root
)
2846 struct btrfs_block_group_cache
*cache
;
2848 struct btrfs_path
*path
;
2851 path
= btrfs_alloc_path();
2857 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
2859 if (cache
->disk_cache_state
== BTRFS_DC_CLEAR
)
2861 cache
= next_block_group(root
, cache
);
2869 err
= cache_save_setup(cache
, trans
, path
);
2870 last
= cache
->key
.objectid
+ cache
->key
.offset
;
2871 btrfs_put_block_group(cache
);
2876 err
= btrfs_run_delayed_refs(trans
, root
,
2881 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
2883 if (cache
->disk_cache_state
== BTRFS_DC_CLEAR
) {
2884 btrfs_put_block_group(cache
);
2890 cache
= next_block_group(root
, cache
);
2899 if (cache
->disk_cache_state
== BTRFS_DC_SETUP
)
2900 cache
->disk_cache_state
= BTRFS_DC_NEED_WRITE
;
2902 last
= cache
->key
.objectid
+ cache
->key
.offset
;
2904 err
= write_one_cache_group(trans
, root
, path
, cache
);
2906 btrfs_put_block_group(cache
);
2911 * I don't think this is needed since we're just marking our
2912 * preallocated extent as written, but just in case it can't
2916 err
= btrfs_run_delayed_refs(trans
, root
,
2921 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
2924 * Really this shouldn't happen, but it could if we
2925 * couldn't write the entire preallocated extent and
2926 * splitting the extent resulted in a new block.
2929 btrfs_put_block_group(cache
);
2932 if (cache
->disk_cache_state
== BTRFS_DC_NEED_WRITE
)
2934 cache
= next_block_group(root
, cache
);
2943 btrfs_write_out_cache(root
, trans
, cache
, path
);
2946 * If we didn't have an error then the cache state is still
2947 * NEED_WRITE, so we can set it to WRITTEN.
2949 if (cache
->disk_cache_state
== BTRFS_DC_NEED_WRITE
)
2950 cache
->disk_cache_state
= BTRFS_DC_WRITTEN
;
2951 last
= cache
->key
.objectid
+ cache
->key
.offset
;
2952 btrfs_put_block_group(cache
);
2955 btrfs_free_path(path
);
2959 int btrfs_extent_readonly(struct btrfs_root
*root
, u64 bytenr
)
2961 struct btrfs_block_group_cache
*block_group
;
2964 block_group
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
2965 if (!block_group
|| block_group
->ro
)
2968 btrfs_put_block_group(block_group
);
2972 static int update_space_info(struct btrfs_fs_info
*info
, u64 flags
,
2973 u64 total_bytes
, u64 bytes_used
,
2974 struct btrfs_space_info
**space_info
)
2976 struct btrfs_space_info
*found
;
2980 if (flags
& (BTRFS_BLOCK_GROUP_DUP
| BTRFS_BLOCK_GROUP_RAID1
|
2981 BTRFS_BLOCK_GROUP_RAID10
))
2986 found
= __find_space_info(info
, flags
);
2988 spin_lock(&found
->lock
);
2989 found
->total_bytes
+= total_bytes
;
2990 found
->disk_total
+= total_bytes
* factor
;
2991 found
->bytes_used
+= bytes_used
;
2992 found
->disk_used
+= bytes_used
* factor
;
2994 spin_unlock(&found
->lock
);
2995 *space_info
= found
;
2998 found
= kzalloc(sizeof(*found
), GFP_NOFS
);
3002 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++)
3003 INIT_LIST_HEAD(&found
->block_groups
[i
]);
3004 init_rwsem(&found
->groups_sem
);
3005 spin_lock_init(&found
->lock
);
3006 found
->flags
= flags
& (BTRFS_BLOCK_GROUP_DATA
|
3007 BTRFS_BLOCK_GROUP_SYSTEM
|
3008 BTRFS_BLOCK_GROUP_METADATA
);
3009 found
->total_bytes
= total_bytes
;
3010 found
->disk_total
= total_bytes
* factor
;
3011 found
->bytes_used
= bytes_used
;
3012 found
->disk_used
= bytes_used
* factor
;
3013 found
->bytes_pinned
= 0;
3014 found
->bytes_reserved
= 0;
3015 found
->bytes_readonly
= 0;
3016 found
->bytes_may_use
= 0;
3018 found
->force_alloc
= 0;
3019 *space_info
= found
;
3020 list_add_rcu(&found
->list
, &info
->space_info
);
3021 atomic_set(&found
->caching_threads
, 0);
3025 static void set_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
3027 u64 extra_flags
= flags
& (BTRFS_BLOCK_GROUP_RAID0
|
3028 BTRFS_BLOCK_GROUP_RAID1
|
3029 BTRFS_BLOCK_GROUP_RAID10
|
3030 BTRFS_BLOCK_GROUP_DUP
);
3032 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3033 fs_info
->avail_data_alloc_bits
|= extra_flags
;
3034 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
3035 fs_info
->avail_metadata_alloc_bits
|= extra_flags
;
3036 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
3037 fs_info
->avail_system_alloc_bits
|= extra_flags
;
3041 u64
btrfs_reduce_alloc_profile(struct btrfs_root
*root
, u64 flags
)
3044 * we add in the count of missing devices because we want
3045 * to make sure that any RAID levels on a degraded FS
3046 * continue to be honored.
3048 u64 num_devices
= root
->fs_info
->fs_devices
->rw_devices
+
3049 root
->fs_info
->fs_devices
->missing_devices
;
3051 if (num_devices
== 1)
3052 flags
&= ~(BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID0
);
3053 if (num_devices
< 4)
3054 flags
&= ~BTRFS_BLOCK_GROUP_RAID10
;
3056 if ((flags
& BTRFS_BLOCK_GROUP_DUP
) &&
3057 (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
3058 BTRFS_BLOCK_GROUP_RAID10
))) {
3059 flags
&= ~BTRFS_BLOCK_GROUP_DUP
;
3062 if ((flags
& BTRFS_BLOCK_GROUP_RAID1
) &&
3063 (flags
& BTRFS_BLOCK_GROUP_RAID10
)) {
3064 flags
&= ~BTRFS_BLOCK_GROUP_RAID1
;
3067 if ((flags
& BTRFS_BLOCK_GROUP_RAID0
) &&
3068 ((flags
& BTRFS_BLOCK_GROUP_RAID1
) |
3069 (flags
& BTRFS_BLOCK_GROUP_RAID10
) |
3070 (flags
& BTRFS_BLOCK_GROUP_DUP
)))
3071 flags
&= ~BTRFS_BLOCK_GROUP_RAID0
;
3075 static u64
get_alloc_profile(struct btrfs_root
*root
, u64 flags
)
3077 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
3078 flags
|= root
->fs_info
->avail_data_alloc_bits
&
3079 root
->fs_info
->data_alloc_profile
;
3080 else if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
3081 flags
|= root
->fs_info
->avail_system_alloc_bits
&
3082 root
->fs_info
->system_alloc_profile
;
3083 else if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
3084 flags
|= root
->fs_info
->avail_metadata_alloc_bits
&
3085 root
->fs_info
->metadata_alloc_profile
;
3086 return btrfs_reduce_alloc_profile(root
, flags
);
3089 u64
btrfs_get_alloc_profile(struct btrfs_root
*root
, int data
)
3094 flags
= BTRFS_BLOCK_GROUP_DATA
;
3095 else if (root
== root
->fs_info
->chunk_root
)
3096 flags
= BTRFS_BLOCK_GROUP_SYSTEM
;
3098 flags
= BTRFS_BLOCK_GROUP_METADATA
;
3100 return get_alloc_profile(root
, flags
);
3103 void btrfs_set_inode_space_info(struct btrfs_root
*root
, struct inode
*inode
)
3105 BTRFS_I(inode
)->space_info
= __find_space_info(root
->fs_info
,
3106 BTRFS_BLOCK_GROUP_DATA
);
3110 * This will check the space that the inode allocates from to make sure we have
3111 * enough space for bytes.
3113 int btrfs_check_data_free_space(struct inode
*inode
, u64 bytes
)
3115 struct btrfs_space_info
*data_sinfo
;
3116 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3118 int ret
= 0, committed
= 0, alloc_chunk
= 1;
3120 /* make sure bytes are sectorsize aligned */
3121 bytes
= (bytes
+ root
->sectorsize
- 1) & ~((u64
)root
->sectorsize
- 1);
3123 if (root
== root
->fs_info
->tree_root
) {
3128 data_sinfo
= BTRFS_I(inode
)->space_info
;
3133 /* make sure we have enough space to handle the data first */
3134 spin_lock(&data_sinfo
->lock
);
3135 used
= data_sinfo
->bytes_used
+ data_sinfo
->bytes_reserved
+
3136 data_sinfo
->bytes_pinned
+ data_sinfo
->bytes_readonly
+
3137 data_sinfo
->bytes_may_use
;
3139 if (used
+ bytes
> data_sinfo
->total_bytes
) {
3140 struct btrfs_trans_handle
*trans
;
3143 * if we don't have enough free bytes in this space then we need
3144 * to alloc a new chunk.
3146 if (!data_sinfo
->full
&& alloc_chunk
) {
3149 data_sinfo
->force_alloc
= 1;
3150 spin_unlock(&data_sinfo
->lock
);
3152 alloc_target
= btrfs_get_alloc_profile(root
, 1);
3153 trans
= btrfs_join_transaction(root
, 1);
3155 return PTR_ERR(trans
);
3157 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
3158 bytes
+ 2 * 1024 * 1024,
3160 btrfs_end_transaction(trans
, root
);
3169 btrfs_set_inode_space_info(root
, inode
);
3170 data_sinfo
= BTRFS_I(inode
)->space_info
;
3174 spin_unlock(&data_sinfo
->lock
);
3176 /* commit the current transaction and try again */
3178 if (!committed
&& !root
->fs_info
->open_ioctl_trans
) {
3180 trans
= btrfs_join_transaction(root
, 1);
3182 return PTR_ERR(trans
);
3183 ret
= btrfs_commit_transaction(trans
, root
);
3189 #if 0 /* I hope we never need this code again, just in case */
3190 printk(KERN_ERR
"no space left, need %llu, %llu bytes_used, "
3191 "%llu bytes_reserved, " "%llu bytes_pinned, "
3192 "%llu bytes_readonly, %llu may use %llu total\n",
3193 (unsigned long long)bytes
,
3194 (unsigned long long)data_sinfo
->bytes_used
,
3195 (unsigned long long)data_sinfo
->bytes_reserved
,
3196 (unsigned long long)data_sinfo
->bytes_pinned
,
3197 (unsigned long long)data_sinfo
->bytes_readonly
,
3198 (unsigned long long)data_sinfo
->bytes_may_use
,
3199 (unsigned long long)data_sinfo
->total_bytes
);
3203 data_sinfo
->bytes_may_use
+= bytes
;
3204 BTRFS_I(inode
)->reserved_bytes
+= bytes
;
3205 spin_unlock(&data_sinfo
->lock
);
3211 * called when we are clearing an delalloc extent from the
3212 * inode's io_tree or there was an error for whatever reason
3213 * after calling btrfs_check_data_free_space
3215 void btrfs_free_reserved_data_space(struct inode
*inode
, u64 bytes
)
3217 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3218 struct btrfs_space_info
*data_sinfo
;
3220 /* make sure bytes are sectorsize aligned */
3221 bytes
= (bytes
+ root
->sectorsize
- 1) & ~((u64
)root
->sectorsize
- 1);
3223 data_sinfo
= BTRFS_I(inode
)->space_info
;
3224 spin_lock(&data_sinfo
->lock
);
3225 data_sinfo
->bytes_may_use
-= bytes
;
3226 BTRFS_I(inode
)->reserved_bytes
-= bytes
;
3227 spin_unlock(&data_sinfo
->lock
);
3230 static void force_metadata_allocation(struct btrfs_fs_info
*info
)
3232 struct list_head
*head
= &info
->space_info
;
3233 struct btrfs_space_info
*found
;
3236 list_for_each_entry_rcu(found
, head
, list
) {
3237 if (found
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
3238 found
->force_alloc
= 1;
3243 static int should_alloc_chunk(struct btrfs_root
*root
,
3244 struct btrfs_space_info
*sinfo
, u64 alloc_bytes
)
3246 u64 num_bytes
= sinfo
->total_bytes
- sinfo
->bytes_readonly
;
3249 if (sinfo
->bytes_used
+ sinfo
->bytes_reserved
+
3250 alloc_bytes
+ 256 * 1024 * 1024 < num_bytes
)
3253 if (sinfo
->bytes_used
+ sinfo
->bytes_reserved
+
3254 alloc_bytes
< div_factor(num_bytes
, 8))
3257 thresh
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
3258 thresh
= max_t(u64
, 256 * 1024 * 1024, div_factor_fine(thresh
, 5));
3260 if (num_bytes
> thresh
&& sinfo
->bytes_used
< div_factor(num_bytes
, 3))
3266 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
,
3267 struct btrfs_root
*extent_root
, u64 alloc_bytes
,
3268 u64 flags
, int force
)
3270 struct btrfs_space_info
*space_info
;
3271 struct btrfs_fs_info
*fs_info
= extent_root
->fs_info
;
3274 mutex_lock(&fs_info
->chunk_mutex
);
3276 flags
= btrfs_reduce_alloc_profile(extent_root
, flags
);
3278 space_info
= __find_space_info(extent_root
->fs_info
, flags
);
3280 ret
= update_space_info(extent_root
->fs_info
, flags
,
3284 BUG_ON(!space_info
);
3286 spin_lock(&space_info
->lock
);
3287 if (space_info
->force_alloc
)
3289 if (space_info
->full
) {
3290 spin_unlock(&space_info
->lock
);
3294 if (!force
&& !should_alloc_chunk(extent_root
, space_info
,
3296 spin_unlock(&space_info
->lock
);
3299 spin_unlock(&space_info
->lock
);
3302 * If we have mixed data/metadata chunks we want to make sure we keep
3303 * allocating mixed chunks instead of individual chunks.
3305 if (btrfs_mixed_space_info(space_info
))
3306 flags
|= (BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
);
3309 * if we're doing a data chunk, go ahead and make sure that
3310 * we keep a reasonable number of metadata chunks allocated in the
3313 if (flags
& BTRFS_BLOCK_GROUP_DATA
&& fs_info
->metadata_ratio
) {
3314 fs_info
->data_chunk_allocations
++;
3315 if (!(fs_info
->data_chunk_allocations
%
3316 fs_info
->metadata_ratio
))
3317 force_metadata_allocation(fs_info
);
3320 ret
= btrfs_alloc_chunk(trans
, extent_root
, flags
);
3321 spin_lock(&space_info
->lock
);
3323 space_info
->full
= 1;
3326 space_info
->force_alloc
= 0;
3327 spin_unlock(&space_info
->lock
);
3329 mutex_unlock(&extent_root
->fs_info
->chunk_mutex
);
3334 * shrink metadata reservation for delalloc
3336 static int shrink_delalloc(struct btrfs_trans_handle
*trans
,
3337 struct btrfs_root
*root
, u64 to_reclaim
, int sync
)
3339 struct btrfs_block_rsv
*block_rsv
;
3340 struct btrfs_space_info
*space_info
;
3345 int nr_pages
= (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT
;
3347 unsigned long progress
;
3349 block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
3350 space_info
= block_rsv
->space_info
;
3353 reserved
= space_info
->bytes_reserved
;
3354 progress
= space_info
->reservation_progress
;
3359 max_reclaim
= min(reserved
, to_reclaim
);
3361 while (loops
< 1024) {
3362 /* have the flusher threads jump in and do some IO */
3364 nr_pages
= min_t(unsigned long, nr_pages
,
3365 root
->fs_info
->delalloc_bytes
>> PAGE_CACHE_SHIFT
);
3366 writeback_inodes_sb_nr_if_idle(root
->fs_info
->sb
, nr_pages
);
3368 spin_lock(&space_info
->lock
);
3369 if (reserved
> space_info
->bytes_reserved
)
3370 reclaimed
+= reserved
- space_info
->bytes_reserved
;
3371 reserved
= space_info
->bytes_reserved
;
3372 spin_unlock(&space_info
->lock
);
3376 if (reserved
== 0 || reclaimed
>= max_reclaim
)
3379 if (trans
&& trans
->transaction
->blocked
)
3382 time_left
= schedule_timeout_interruptible(1);
3384 /* We were interrupted, exit */
3388 /* we've kicked the IO a few times, if anything has been freed,
3389 * exit. There is no sense in looping here for a long time
3390 * when we really need to commit the transaction, or there are
3391 * just too many writers without enough free space
3396 if (progress
!= space_info
->reservation_progress
)
3401 return reclaimed
>= to_reclaim
;
3405 * Retries tells us how many times we've called reserve_metadata_bytes. The
3406 * idea is if this is the first call (retries == 0) then we will add to our
3407 * reserved count if we can't make the allocation in order to hold our place
3408 * while we go and try and free up space. That way for retries > 1 we don't try
3409 * and add space, we just check to see if the amount of unused space is >= the
3410 * total space, meaning that our reservation is valid.
3412 * However if we don't intend to retry this reservation, pass -1 as retries so
3413 * that it short circuits this logic.
3415 static int reserve_metadata_bytes(struct btrfs_trans_handle
*trans
,
3416 struct btrfs_root
*root
,
3417 struct btrfs_block_rsv
*block_rsv
,
3418 u64 orig_bytes
, int flush
)
3420 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
3422 u64 num_bytes
= orig_bytes
;
3425 bool reserved
= false;
3426 bool committed
= false;
3433 spin_lock(&space_info
->lock
);
3434 unused
= space_info
->bytes_used
+ space_info
->bytes_reserved
+
3435 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
3436 space_info
->bytes_may_use
;
3439 * The idea here is that we've not already over-reserved the block group
3440 * then we can go ahead and save our reservation first and then start
3441 * flushing if we need to. Otherwise if we've already overcommitted
3442 * lets start flushing stuff first and then come back and try to make
3445 if (unused
<= space_info
->total_bytes
) {
3446 unused
= space_info
->total_bytes
- unused
;
3447 if (unused
>= num_bytes
) {
3449 space_info
->bytes_reserved
+= orig_bytes
;
3453 * Ok set num_bytes to orig_bytes since we aren't
3454 * overocmmitted, this way we only try and reclaim what
3457 num_bytes
= orig_bytes
;
3461 * Ok we're over committed, set num_bytes to the overcommitted
3462 * amount plus the amount of bytes that we need for this
3465 num_bytes
= unused
- space_info
->total_bytes
+
3466 (orig_bytes
* (retries
+ 1));
3470 * Couldn't make our reservation, save our place so while we're trying
3471 * to reclaim space we can actually use it instead of somebody else
3472 * stealing it from us.
3474 if (ret
&& !reserved
) {
3475 space_info
->bytes_reserved
+= orig_bytes
;
3479 spin_unlock(&space_info
->lock
);
3488 * We do synchronous shrinking since we don't actually unreserve
3489 * metadata until after the IO is completed.
3491 ret
= shrink_delalloc(trans
, root
, num_bytes
, 1);
3498 * So if we were overcommitted it's possible that somebody else flushed
3499 * out enough space and we simply didn't have enough space to reclaim,
3500 * so go back around and try again.
3507 spin_lock(&space_info
->lock
);
3509 * Not enough space to be reclaimed, don't bother committing the
3512 if (space_info
->bytes_pinned
< orig_bytes
)
3514 spin_unlock(&space_info
->lock
);
3519 if (trans
|| committed
)
3523 trans
= btrfs_join_transaction(root
, 1);
3526 ret
= btrfs_commit_transaction(trans
, root
);
3535 spin_lock(&space_info
->lock
);
3536 space_info
->bytes_reserved
-= orig_bytes
;
3537 spin_unlock(&space_info
->lock
);
3543 static struct btrfs_block_rsv
*get_block_rsv(struct btrfs_trans_handle
*trans
,
3544 struct btrfs_root
*root
)
3546 struct btrfs_block_rsv
*block_rsv
;
3548 block_rsv
= trans
->block_rsv
;
3550 block_rsv
= root
->block_rsv
;
3553 block_rsv
= &root
->fs_info
->empty_block_rsv
;
3558 static int block_rsv_use_bytes(struct btrfs_block_rsv
*block_rsv
,
3562 spin_lock(&block_rsv
->lock
);
3563 if (block_rsv
->reserved
>= num_bytes
) {
3564 block_rsv
->reserved
-= num_bytes
;
3565 if (block_rsv
->reserved
< block_rsv
->size
)
3566 block_rsv
->full
= 0;
3569 spin_unlock(&block_rsv
->lock
);
3573 static void block_rsv_add_bytes(struct btrfs_block_rsv
*block_rsv
,
3574 u64 num_bytes
, int update_size
)
3576 spin_lock(&block_rsv
->lock
);
3577 block_rsv
->reserved
+= num_bytes
;
3579 block_rsv
->size
+= num_bytes
;
3580 else if (block_rsv
->reserved
>= block_rsv
->size
)
3581 block_rsv
->full
= 1;
3582 spin_unlock(&block_rsv
->lock
);
3585 void block_rsv_release_bytes(struct btrfs_block_rsv
*block_rsv
,
3586 struct btrfs_block_rsv
*dest
, u64 num_bytes
)
3588 struct btrfs_space_info
*space_info
= block_rsv
->space_info
;
3590 spin_lock(&block_rsv
->lock
);
3591 if (num_bytes
== (u64
)-1)
3592 num_bytes
= block_rsv
->size
;
3593 block_rsv
->size
-= num_bytes
;
3594 if (block_rsv
->reserved
>= block_rsv
->size
) {
3595 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
3596 block_rsv
->reserved
= block_rsv
->size
;
3597 block_rsv
->full
= 1;
3601 spin_unlock(&block_rsv
->lock
);
3603 if (num_bytes
> 0) {
3605 spin_lock(&dest
->lock
);
3609 bytes_to_add
= dest
->size
- dest
->reserved
;
3610 bytes_to_add
= min(num_bytes
, bytes_to_add
);
3611 dest
->reserved
+= bytes_to_add
;
3612 if (dest
->reserved
>= dest
->size
)
3614 num_bytes
-= bytes_to_add
;
3616 spin_unlock(&dest
->lock
);
3619 spin_lock(&space_info
->lock
);
3620 space_info
->bytes_reserved
-= num_bytes
;
3621 space_info
->reservation_progress
++;
3622 spin_unlock(&space_info
->lock
);
3627 static int block_rsv_migrate_bytes(struct btrfs_block_rsv
*src
,
3628 struct btrfs_block_rsv
*dst
, u64 num_bytes
)
3632 ret
= block_rsv_use_bytes(src
, num_bytes
);
3636 block_rsv_add_bytes(dst
, num_bytes
, 1);
3640 void btrfs_init_block_rsv(struct btrfs_block_rsv
*rsv
)
3642 memset(rsv
, 0, sizeof(*rsv
));
3643 spin_lock_init(&rsv
->lock
);
3644 atomic_set(&rsv
->usage
, 1);
3646 INIT_LIST_HEAD(&rsv
->list
);
3649 struct btrfs_block_rsv
*btrfs_alloc_block_rsv(struct btrfs_root
*root
)
3651 struct btrfs_block_rsv
*block_rsv
;
3652 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3654 block_rsv
= kmalloc(sizeof(*block_rsv
), GFP_NOFS
);
3658 btrfs_init_block_rsv(block_rsv
);
3659 block_rsv
->space_info
= __find_space_info(fs_info
,
3660 BTRFS_BLOCK_GROUP_METADATA
);
3664 void btrfs_free_block_rsv(struct btrfs_root
*root
,
3665 struct btrfs_block_rsv
*rsv
)
3667 if (rsv
&& atomic_dec_and_test(&rsv
->usage
)) {
3668 btrfs_block_rsv_release(root
, rsv
, (u64
)-1);
3675 * make the block_rsv struct be able to capture freed space.
3676 * the captured space will re-add to the the block_rsv struct
3677 * after transaction commit
3679 void btrfs_add_durable_block_rsv(struct btrfs_fs_info
*fs_info
,
3680 struct btrfs_block_rsv
*block_rsv
)
3682 block_rsv
->durable
= 1;
3683 mutex_lock(&fs_info
->durable_block_rsv_mutex
);
3684 list_add_tail(&block_rsv
->list
, &fs_info
->durable_block_rsv_list
);
3685 mutex_unlock(&fs_info
->durable_block_rsv_mutex
);
3688 int btrfs_block_rsv_add(struct btrfs_trans_handle
*trans
,
3689 struct btrfs_root
*root
,
3690 struct btrfs_block_rsv
*block_rsv
,
3698 ret
= reserve_metadata_bytes(trans
, root
, block_rsv
, num_bytes
, 1);
3700 block_rsv_add_bytes(block_rsv
, num_bytes
, 1);
3707 int btrfs_block_rsv_check(struct btrfs_trans_handle
*trans
,
3708 struct btrfs_root
*root
,
3709 struct btrfs_block_rsv
*block_rsv
,
3710 u64 min_reserved
, int min_factor
)
3713 int commit_trans
= 0;
3719 spin_lock(&block_rsv
->lock
);
3721 num_bytes
= div_factor(block_rsv
->size
, min_factor
);
3722 if (min_reserved
> num_bytes
)
3723 num_bytes
= min_reserved
;
3725 if (block_rsv
->reserved
>= num_bytes
) {
3728 num_bytes
-= block_rsv
->reserved
;
3729 if (block_rsv
->durable
&&
3730 block_rsv
->freed
[0] + block_rsv
->freed
[1] >= num_bytes
)
3733 spin_unlock(&block_rsv
->lock
);
3737 if (block_rsv
->refill_used
) {
3738 ret
= reserve_metadata_bytes(trans
, root
, block_rsv
,
3741 block_rsv_add_bytes(block_rsv
, num_bytes
, 0);
3750 trans
= btrfs_join_transaction(root
, 1);
3751 BUG_ON(IS_ERR(trans
));
3752 ret
= btrfs_commit_transaction(trans
, root
);
3759 int btrfs_block_rsv_migrate(struct btrfs_block_rsv
*src_rsv
,
3760 struct btrfs_block_rsv
*dst_rsv
,
3763 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
3766 void btrfs_block_rsv_release(struct btrfs_root
*root
,
3767 struct btrfs_block_rsv
*block_rsv
,
3770 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
3771 if (global_rsv
->full
|| global_rsv
== block_rsv
||
3772 block_rsv
->space_info
!= global_rsv
->space_info
)
3774 block_rsv_release_bytes(block_rsv
, global_rsv
, num_bytes
);
3778 * helper to calculate size of global block reservation.
3779 * the desired value is sum of space used by extent tree,
3780 * checksum tree and root tree
3782 static u64
calc_global_metadata_size(struct btrfs_fs_info
*fs_info
)
3784 struct btrfs_space_info
*sinfo
;
3788 int csum_size
= btrfs_super_csum_size(&fs_info
->super_copy
);
3791 * per tree used space accounting can be inaccuracy, so we
3794 spin_lock(&fs_info
->extent_root
->accounting_lock
);
3795 num_bytes
= btrfs_root_used(&fs_info
->extent_root
->root_item
);
3796 spin_unlock(&fs_info
->extent_root
->accounting_lock
);
3798 spin_lock(&fs_info
->csum_root
->accounting_lock
);
3799 num_bytes
+= btrfs_root_used(&fs_info
->csum_root
->root_item
);
3800 spin_unlock(&fs_info
->csum_root
->accounting_lock
);
3802 spin_lock(&fs_info
->tree_root
->accounting_lock
);
3803 num_bytes
+= btrfs_root_used(&fs_info
->tree_root
->root_item
);
3804 spin_unlock(&fs_info
->tree_root
->accounting_lock
);
3806 sinfo
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_DATA
);
3807 spin_lock(&sinfo
->lock
);
3808 data_used
= sinfo
->bytes_used
;
3809 spin_unlock(&sinfo
->lock
);
3811 sinfo
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
3812 spin_lock(&sinfo
->lock
);
3813 if (sinfo
->flags
& BTRFS_BLOCK_GROUP_DATA
)
3815 meta_used
= sinfo
->bytes_used
;
3816 spin_unlock(&sinfo
->lock
);
3818 num_bytes
= (data_used
>> fs_info
->sb
->s_blocksize_bits
) *
3820 num_bytes
+= div64_u64(data_used
+ meta_used
, 50);
3822 if (num_bytes
* 3 > meta_used
)
3823 num_bytes
= div64_u64(meta_used
, 3);
3825 return ALIGN(num_bytes
, fs_info
->extent_root
->leafsize
<< 10);
3828 static void update_global_block_rsv(struct btrfs_fs_info
*fs_info
)
3830 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
3831 struct btrfs_space_info
*sinfo
= block_rsv
->space_info
;
3834 num_bytes
= calc_global_metadata_size(fs_info
);
3836 spin_lock(&block_rsv
->lock
);
3837 spin_lock(&sinfo
->lock
);
3839 block_rsv
->size
= num_bytes
;
3841 num_bytes
= sinfo
->bytes_used
+ sinfo
->bytes_pinned
+
3842 sinfo
->bytes_reserved
+ sinfo
->bytes_readonly
+
3843 sinfo
->bytes_may_use
;
3845 if (sinfo
->total_bytes
> num_bytes
) {
3846 num_bytes
= sinfo
->total_bytes
- num_bytes
;
3847 block_rsv
->reserved
+= num_bytes
;
3848 sinfo
->bytes_reserved
+= num_bytes
;
3851 if (block_rsv
->reserved
>= block_rsv
->size
) {
3852 num_bytes
= block_rsv
->reserved
- block_rsv
->size
;
3853 sinfo
->bytes_reserved
-= num_bytes
;
3854 sinfo
->reservation_progress
++;
3855 block_rsv
->reserved
= block_rsv
->size
;
3856 block_rsv
->full
= 1;
3859 printk(KERN_INFO
"global block rsv size %llu reserved %llu\n",
3860 block_rsv
->size
, block_rsv
->reserved
);
3862 spin_unlock(&sinfo
->lock
);
3863 spin_unlock(&block_rsv
->lock
);
3866 static void init_global_block_rsv(struct btrfs_fs_info
*fs_info
)
3868 struct btrfs_space_info
*space_info
;
3870 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
3871 fs_info
->chunk_block_rsv
.space_info
= space_info
;
3872 fs_info
->chunk_block_rsv
.priority
= 10;
3874 space_info
= __find_space_info(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
3875 fs_info
->global_block_rsv
.space_info
= space_info
;
3876 fs_info
->global_block_rsv
.priority
= 10;
3877 fs_info
->global_block_rsv
.refill_used
= 1;
3878 fs_info
->delalloc_block_rsv
.space_info
= space_info
;
3879 fs_info
->trans_block_rsv
.space_info
= space_info
;
3880 fs_info
->empty_block_rsv
.space_info
= space_info
;
3881 fs_info
->empty_block_rsv
.priority
= 10;
3883 fs_info
->extent_root
->block_rsv
= &fs_info
->global_block_rsv
;
3884 fs_info
->csum_root
->block_rsv
= &fs_info
->global_block_rsv
;
3885 fs_info
->dev_root
->block_rsv
= &fs_info
->global_block_rsv
;
3886 fs_info
->tree_root
->block_rsv
= &fs_info
->global_block_rsv
;
3887 fs_info
->chunk_root
->block_rsv
= &fs_info
->chunk_block_rsv
;
3889 btrfs_add_durable_block_rsv(fs_info
, &fs_info
->global_block_rsv
);
3891 btrfs_add_durable_block_rsv(fs_info
, &fs_info
->delalloc_block_rsv
);
3893 update_global_block_rsv(fs_info
);
3896 static void release_global_block_rsv(struct btrfs_fs_info
*fs_info
)
3898 block_rsv_release_bytes(&fs_info
->global_block_rsv
, NULL
, (u64
)-1);
3899 WARN_ON(fs_info
->delalloc_block_rsv
.size
> 0);
3900 WARN_ON(fs_info
->delalloc_block_rsv
.reserved
> 0);
3901 WARN_ON(fs_info
->trans_block_rsv
.size
> 0);
3902 WARN_ON(fs_info
->trans_block_rsv
.reserved
> 0);
3903 WARN_ON(fs_info
->chunk_block_rsv
.size
> 0);
3904 WARN_ON(fs_info
->chunk_block_rsv
.reserved
> 0);
3907 static u64
calc_trans_metadata_size(struct btrfs_root
*root
, int num_items
)
3909 return (root
->leafsize
+ root
->nodesize
* (BTRFS_MAX_LEVEL
- 1)) *
3913 int btrfs_trans_reserve_metadata(struct btrfs_trans_handle
*trans
,
3914 struct btrfs_root
*root
,
3920 if (num_items
== 0 || root
->fs_info
->chunk_root
== root
)
3923 num_bytes
= calc_trans_metadata_size(root
, num_items
);
3924 ret
= btrfs_block_rsv_add(trans
, root
, &root
->fs_info
->trans_block_rsv
,
3927 trans
->bytes_reserved
+= num_bytes
;
3928 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
3933 void btrfs_trans_release_metadata(struct btrfs_trans_handle
*trans
,
3934 struct btrfs_root
*root
)
3936 if (!trans
->bytes_reserved
)
3939 BUG_ON(trans
->block_rsv
!= &root
->fs_info
->trans_block_rsv
);
3940 btrfs_block_rsv_release(root
, trans
->block_rsv
,
3941 trans
->bytes_reserved
);
3942 trans
->bytes_reserved
= 0;
3945 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle
*trans
,
3946 struct inode
*inode
)
3948 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3949 struct btrfs_block_rsv
*src_rsv
= get_block_rsv(trans
, root
);
3950 struct btrfs_block_rsv
*dst_rsv
= root
->orphan_block_rsv
;
3953 * one for deleting orphan item, one for updating inode and
3954 * two for calling btrfs_truncate_inode_items.
3956 * btrfs_truncate_inode_items is a delete operation, it frees
3957 * more space than it uses in most cases. So two units of
3958 * metadata space should be enough for calling it many times.
3959 * If all of the metadata space is used, we can commit
3960 * transaction and use space it freed.
3962 u64 num_bytes
= calc_trans_metadata_size(root
, 4);
3963 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
3966 void btrfs_orphan_release_metadata(struct inode
*inode
)
3968 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3969 u64 num_bytes
= calc_trans_metadata_size(root
, 4);
3970 btrfs_block_rsv_release(root
, root
->orphan_block_rsv
, num_bytes
);
3973 int btrfs_snap_reserve_metadata(struct btrfs_trans_handle
*trans
,
3974 struct btrfs_pending_snapshot
*pending
)
3976 struct btrfs_root
*root
= pending
->root
;
3977 struct btrfs_block_rsv
*src_rsv
= get_block_rsv(trans
, root
);
3978 struct btrfs_block_rsv
*dst_rsv
= &pending
->block_rsv
;
3980 * two for root back/forward refs, two for directory entries
3981 * and one for root of the snapshot.
3983 u64 num_bytes
= calc_trans_metadata_size(root
, 5);
3984 dst_rsv
->space_info
= src_rsv
->space_info
;
3985 return block_rsv_migrate_bytes(src_rsv
, dst_rsv
, num_bytes
);
3988 static u64
calc_csum_metadata_size(struct inode
*inode
, u64 num_bytes
)
3990 return num_bytes
>>= 3;
3993 int btrfs_delalloc_reserve_metadata(struct inode
*inode
, u64 num_bytes
)
3995 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3996 struct btrfs_block_rsv
*block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
3999 int reserved_extents
;
4002 if (btrfs_transaction_in_commit(root
->fs_info
))
4003 schedule_timeout(1);
4005 num_bytes
= ALIGN(num_bytes
, root
->sectorsize
);
4007 nr_extents
= atomic_read(&BTRFS_I(inode
)->outstanding_extents
) + 1;
4008 reserved_extents
= atomic_read(&BTRFS_I(inode
)->reserved_extents
);
4010 if (nr_extents
> reserved_extents
) {
4011 nr_extents
-= reserved_extents
;
4012 to_reserve
= calc_trans_metadata_size(root
, nr_extents
);
4018 to_reserve
+= calc_csum_metadata_size(inode
, num_bytes
);
4019 ret
= reserve_metadata_bytes(NULL
, root
, block_rsv
, to_reserve
, 1);
4023 atomic_add(nr_extents
, &BTRFS_I(inode
)->reserved_extents
);
4024 atomic_inc(&BTRFS_I(inode
)->outstanding_extents
);
4026 block_rsv_add_bytes(block_rsv
, to_reserve
, 1);
4028 if (block_rsv
->size
> 512 * 1024 * 1024)
4029 shrink_delalloc(NULL
, root
, to_reserve
, 0);
4034 void btrfs_delalloc_release_metadata(struct inode
*inode
, u64 num_bytes
)
4036 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4039 int reserved_extents
;
4041 num_bytes
= ALIGN(num_bytes
, root
->sectorsize
);
4042 atomic_dec(&BTRFS_I(inode
)->outstanding_extents
);
4043 WARN_ON(atomic_read(&BTRFS_I(inode
)->outstanding_extents
) < 0);
4045 reserved_extents
= atomic_read(&BTRFS_I(inode
)->reserved_extents
);
4049 nr_extents
= atomic_read(&BTRFS_I(inode
)->outstanding_extents
);
4050 if (nr_extents
>= reserved_extents
) {
4054 old
= reserved_extents
;
4055 nr_extents
= reserved_extents
- nr_extents
;
4056 new = reserved_extents
- nr_extents
;
4057 old
= atomic_cmpxchg(&BTRFS_I(inode
)->reserved_extents
,
4058 reserved_extents
, new);
4059 if (likely(old
== reserved_extents
))
4061 reserved_extents
= old
;
4064 to_free
= calc_csum_metadata_size(inode
, num_bytes
);
4066 to_free
+= calc_trans_metadata_size(root
, nr_extents
);
4068 btrfs_block_rsv_release(root
, &root
->fs_info
->delalloc_block_rsv
,
4072 int btrfs_delalloc_reserve_space(struct inode
*inode
, u64 num_bytes
)
4076 ret
= btrfs_check_data_free_space(inode
, num_bytes
);
4080 ret
= btrfs_delalloc_reserve_metadata(inode
, num_bytes
);
4082 btrfs_free_reserved_data_space(inode
, num_bytes
);
4089 void btrfs_delalloc_release_space(struct inode
*inode
, u64 num_bytes
)
4091 btrfs_delalloc_release_metadata(inode
, num_bytes
);
4092 btrfs_free_reserved_data_space(inode
, num_bytes
);
4095 static int update_block_group(struct btrfs_trans_handle
*trans
,
4096 struct btrfs_root
*root
,
4097 u64 bytenr
, u64 num_bytes
, int alloc
)
4099 struct btrfs_block_group_cache
*cache
= NULL
;
4100 struct btrfs_fs_info
*info
= root
->fs_info
;
4101 u64 total
= num_bytes
;
4106 /* block accounting for super block */
4107 spin_lock(&info
->delalloc_lock
);
4108 old_val
= btrfs_super_bytes_used(&info
->super_copy
);
4110 old_val
+= num_bytes
;
4112 old_val
-= num_bytes
;
4113 btrfs_set_super_bytes_used(&info
->super_copy
, old_val
);
4114 spin_unlock(&info
->delalloc_lock
);
4117 cache
= btrfs_lookup_block_group(info
, bytenr
);
4120 if (cache
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
4121 BTRFS_BLOCK_GROUP_RAID1
|
4122 BTRFS_BLOCK_GROUP_RAID10
))
4127 * If this block group has free space cache written out, we
4128 * need to make sure to load it if we are removing space. This
4129 * is because we need the unpinning stage to actually add the
4130 * space back to the block group, otherwise we will leak space.
4132 if (!alloc
&& cache
->cached
== BTRFS_CACHE_NO
)
4133 cache_block_group(cache
, trans
, NULL
, 1);
4135 byte_in_group
= bytenr
- cache
->key
.objectid
;
4136 WARN_ON(byte_in_group
> cache
->key
.offset
);
4138 spin_lock(&cache
->space_info
->lock
);
4139 spin_lock(&cache
->lock
);
4141 if (btrfs_super_cache_generation(&info
->super_copy
) != 0 &&
4142 cache
->disk_cache_state
< BTRFS_DC_CLEAR
)
4143 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
4146 old_val
= btrfs_block_group_used(&cache
->item
);
4147 num_bytes
= min(total
, cache
->key
.offset
- byte_in_group
);
4149 old_val
+= num_bytes
;
4150 btrfs_set_block_group_used(&cache
->item
, old_val
);
4151 cache
->reserved
-= num_bytes
;
4152 cache
->space_info
->bytes_reserved
-= num_bytes
;
4153 cache
->space_info
->reservation_progress
++;
4154 cache
->space_info
->bytes_used
+= num_bytes
;
4155 cache
->space_info
->disk_used
+= num_bytes
* factor
;
4156 spin_unlock(&cache
->lock
);
4157 spin_unlock(&cache
->space_info
->lock
);
4159 old_val
-= num_bytes
;
4160 btrfs_set_block_group_used(&cache
->item
, old_val
);
4161 cache
->pinned
+= num_bytes
;
4162 cache
->space_info
->bytes_pinned
+= num_bytes
;
4163 cache
->space_info
->bytes_used
-= num_bytes
;
4164 cache
->space_info
->disk_used
-= num_bytes
* factor
;
4165 spin_unlock(&cache
->lock
);
4166 spin_unlock(&cache
->space_info
->lock
);
4168 set_extent_dirty(info
->pinned_extents
,
4169 bytenr
, bytenr
+ num_bytes
- 1,
4170 GFP_NOFS
| __GFP_NOFAIL
);
4172 btrfs_put_block_group(cache
);
4174 bytenr
+= num_bytes
;
4179 static u64
first_logical_byte(struct btrfs_root
*root
, u64 search_start
)
4181 struct btrfs_block_group_cache
*cache
;
4184 cache
= btrfs_lookup_first_block_group(root
->fs_info
, search_start
);
4188 bytenr
= cache
->key
.objectid
;
4189 btrfs_put_block_group(cache
);
4194 static int pin_down_extent(struct btrfs_root
*root
,
4195 struct btrfs_block_group_cache
*cache
,
4196 u64 bytenr
, u64 num_bytes
, int reserved
)
4198 spin_lock(&cache
->space_info
->lock
);
4199 spin_lock(&cache
->lock
);
4200 cache
->pinned
+= num_bytes
;
4201 cache
->space_info
->bytes_pinned
+= num_bytes
;
4203 cache
->reserved
-= num_bytes
;
4204 cache
->space_info
->bytes_reserved
-= num_bytes
;
4205 cache
->space_info
->reservation_progress
++;
4207 spin_unlock(&cache
->lock
);
4208 spin_unlock(&cache
->space_info
->lock
);
4210 set_extent_dirty(root
->fs_info
->pinned_extents
, bytenr
,
4211 bytenr
+ num_bytes
- 1, GFP_NOFS
| __GFP_NOFAIL
);
4216 * this function must be called within transaction
4218 int btrfs_pin_extent(struct btrfs_root
*root
,
4219 u64 bytenr
, u64 num_bytes
, int reserved
)
4221 struct btrfs_block_group_cache
*cache
;
4223 cache
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
4226 pin_down_extent(root
, cache
, bytenr
, num_bytes
, reserved
);
4228 btrfs_put_block_group(cache
);
4233 * update size of reserved extents. this function may return -EAGAIN
4234 * if 'reserve' is true or 'sinfo' is false.
4236 static int update_reserved_bytes(struct btrfs_block_group_cache
*cache
,
4237 u64 num_bytes
, int reserve
, int sinfo
)
4241 struct btrfs_space_info
*space_info
= cache
->space_info
;
4242 spin_lock(&space_info
->lock
);
4243 spin_lock(&cache
->lock
);
4248 cache
->reserved
+= num_bytes
;
4249 space_info
->bytes_reserved
+= num_bytes
;
4253 space_info
->bytes_readonly
+= num_bytes
;
4254 cache
->reserved
-= num_bytes
;
4255 space_info
->bytes_reserved
-= num_bytes
;
4256 space_info
->reservation_progress
++;
4258 spin_unlock(&cache
->lock
);
4259 spin_unlock(&space_info
->lock
);
4261 spin_lock(&cache
->lock
);
4266 cache
->reserved
+= num_bytes
;
4268 cache
->reserved
-= num_bytes
;
4270 spin_unlock(&cache
->lock
);
4275 int btrfs_prepare_extent_commit(struct btrfs_trans_handle
*trans
,
4276 struct btrfs_root
*root
)
4278 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4279 struct btrfs_caching_control
*next
;
4280 struct btrfs_caching_control
*caching_ctl
;
4281 struct btrfs_block_group_cache
*cache
;
4283 down_write(&fs_info
->extent_commit_sem
);
4285 list_for_each_entry_safe(caching_ctl
, next
,
4286 &fs_info
->caching_block_groups
, list
) {
4287 cache
= caching_ctl
->block_group
;
4288 if (block_group_cache_done(cache
)) {
4289 cache
->last_byte_to_unpin
= (u64
)-1;
4290 list_del_init(&caching_ctl
->list
);
4291 put_caching_control(caching_ctl
);
4293 cache
->last_byte_to_unpin
= caching_ctl
->progress
;
4297 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
4298 fs_info
->pinned_extents
= &fs_info
->freed_extents
[1];
4300 fs_info
->pinned_extents
= &fs_info
->freed_extents
[0];
4302 up_write(&fs_info
->extent_commit_sem
);
4304 update_global_block_rsv(fs_info
);
4308 static int unpin_extent_range(struct btrfs_root
*root
, u64 start
, u64 end
)
4310 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4311 struct btrfs_block_group_cache
*cache
= NULL
;
4314 while (start
<= end
) {
4316 start
>= cache
->key
.objectid
+ cache
->key
.offset
) {
4318 btrfs_put_block_group(cache
);
4319 cache
= btrfs_lookup_block_group(fs_info
, start
);
4323 len
= cache
->key
.objectid
+ cache
->key
.offset
- start
;
4324 len
= min(len
, end
+ 1 - start
);
4326 if (start
< cache
->last_byte_to_unpin
) {
4327 len
= min(len
, cache
->last_byte_to_unpin
- start
);
4328 btrfs_add_free_space(cache
, start
, len
);
4333 spin_lock(&cache
->space_info
->lock
);
4334 spin_lock(&cache
->lock
);
4335 cache
->pinned
-= len
;
4336 cache
->space_info
->bytes_pinned
-= len
;
4338 cache
->space_info
->bytes_readonly
+= len
;
4339 } else if (cache
->reserved_pinned
> 0) {
4340 len
= min(len
, cache
->reserved_pinned
);
4341 cache
->reserved_pinned
-= len
;
4342 cache
->space_info
->bytes_reserved
+= len
;
4344 spin_unlock(&cache
->lock
);
4345 spin_unlock(&cache
->space_info
->lock
);
4349 btrfs_put_block_group(cache
);
4353 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
4354 struct btrfs_root
*root
)
4356 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4357 struct extent_io_tree
*unpin
;
4358 struct btrfs_block_rsv
*block_rsv
;
4359 struct btrfs_block_rsv
*next_rsv
;
4365 if (fs_info
->pinned_extents
== &fs_info
->freed_extents
[0])
4366 unpin
= &fs_info
->freed_extents
[1];
4368 unpin
= &fs_info
->freed_extents
[0];
4371 ret
= find_first_extent_bit(unpin
, 0, &start
, &end
,
4376 ret
= btrfs_discard_extent(root
, start
, end
+ 1 - start
);
4378 clear_extent_dirty(unpin
, start
, end
, GFP_NOFS
);
4379 unpin_extent_range(root
, start
, end
);
4383 mutex_lock(&fs_info
->durable_block_rsv_mutex
);
4384 list_for_each_entry_safe(block_rsv
, next_rsv
,
4385 &fs_info
->durable_block_rsv_list
, list
) {
4387 idx
= trans
->transid
& 0x1;
4388 if (block_rsv
->freed
[idx
] > 0) {
4389 block_rsv_add_bytes(block_rsv
,
4390 block_rsv
->freed
[idx
], 0);
4391 block_rsv
->freed
[idx
] = 0;
4393 if (atomic_read(&block_rsv
->usage
) == 0) {
4394 btrfs_block_rsv_release(root
, block_rsv
, (u64
)-1);
4396 if (block_rsv
->freed
[0] == 0 &&
4397 block_rsv
->freed
[1] == 0) {
4398 list_del_init(&block_rsv
->list
);
4402 btrfs_block_rsv_release(root
, block_rsv
, 0);
4405 mutex_unlock(&fs_info
->durable_block_rsv_mutex
);
4410 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
4411 struct btrfs_root
*root
,
4412 u64 bytenr
, u64 num_bytes
, u64 parent
,
4413 u64 root_objectid
, u64 owner_objectid
,
4414 u64 owner_offset
, int refs_to_drop
,
4415 struct btrfs_delayed_extent_op
*extent_op
)
4417 struct btrfs_key key
;
4418 struct btrfs_path
*path
;
4419 struct btrfs_fs_info
*info
= root
->fs_info
;
4420 struct btrfs_root
*extent_root
= info
->extent_root
;
4421 struct extent_buffer
*leaf
;
4422 struct btrfs_extent_item
*ei
;
4423 struct btrfs_extent_inline_ref
*iref
;
4426 int extent_slot
= 0;
4427 int found_extent
= 0;
4432 path
= btrfs_alloc_path();
4437 path
->leave_spinning
= 1;
4439 is_data
= owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
;
4440 BUG_ON(!is_data
&& refs_to_drop
!= 1);
4442 ret
= lookup_extent_backref(trans
, extent_root
, path
, &iref
,
4443 bytenr
, num_bytes
, parent
,
4444 root_objectid
, owner_objectid
,
4447 extent_slot
= path
->slots
[0];
4448 while (extent_slot
>= 0) {
4449 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
4451 if (key
.objectid
!= bytenr
)
4453 if (key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
4454 key
.offset
== num_bytes
) {
4458 if (path
->slots
[0] - extent_slot
> 5)
4462 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
4463 item_size
= btrfs_item_size_nr(path
->nodes
[0], extent_slot
);
4464 if (found_extent
&& item_size
< sizeof(*ei
))
4467 if (!found_extent
) {
4469 ret
= remove_extent_backref(trans
, extent_root
, path
,
4473 btrfs_release_path(extent_root
, path
);
4474 path
->leave_spinning
= 1;
4476 key
.objectid
= bytenr
;
4477 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
4478 key
.offset
= num_bytes
;
4480 ret
= btrfs_search_slot(trans
, extent_root
,
4483 printk(KERN_ERR
"umm, got %d back from search"
4484 ", was looking for %llu\n", ret
,
4485 (unsigned long long)bytenr
);
4486 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
4489 extent_slot
= path
->slots
[0];
4492 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
4494 printk(KERN_ERR
"btrfs unable to find ref byte nr %llu "
4495 "parent %llu root %llu owner %llu offset %llu\n",
4496 (unsigned long long)bytenr
,
4497 (unsigned long long)parent
,
4498 (unsigned long long)root_objectid
,
4499 (unsigned long long)owner_objectid
,
4500 (unsigned long long)owner_offset
);
4503 leaf
= path
->nodes
[0];
4504 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
4505 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
4506 if (item_size
< sizeof(*ei
)) {
4507 BUG_ON(found_extent
|| extent_slot
!= path
->slots
[0]);
4508 ret
= convert_extent_item_v0(trans
, extent_root
, path
,
4512 btrfs_release_path(extent_root
, path
);
4513 path
->leave_spinning
= 1;
4515 key
.objectid
= bytenr
;
4516 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
4517 key
.offset
= num_bytes
;
4519 ret
= btrfs_search_slot(trans
, extent_root
, &key
, path
,
4522 printk(KERN_ERR
"umm, got %d back from search"
4523 ", was looking for %llu\n", ret
,
4524 (unsigned long long)bytenr
);
4525 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
4528 extent_slot
= path
->slots
[0];
4529 leaf
= path
->nodes
[0];
4530 item_size
= btrfs_item_size_nr(leaf
, extent_slot
);
4533 BUG_ON(item_size
< sizeof(*ei
));
4534 ei
= btrfs_item_ptr(leaf
, extent_slot
,
4535 struct btrfs_extent_item
);
4536 if (owner_objectid
< BTRFS_FIRST_FREE_OBJECTID
) {
4537 struct btrfs_tree_block_info
*bi
;
4538 BUG_ON(item_size
< sizeof(*ei
) + sizeof(*bi
));
4539 bi
= (struct btrfs_tree_block_info
*)(ei
+ 1);
4540 WARN_ON(owner_objectid
!= btrfs_tree_block_level(leaf
, bi
));
4543 refs
= btrfs_extent_refs(leaf
, ei
);
4544 BUG_ON(refs
< refs_to_drop
);
4545 refs
-= refs_to_drop
;
4549 __run_delayed_extent_op(extent_op
, leaf
, ei
);
4551 * In the case of inline back ref, reference count will
4552 * be updated by remove_extent_backref
4555 BUG_ON(!found_extent
);
4557 btrfs_set_extent_refs(leaf
, ei
, refs
);
4558 btrfs_mark_buffer_dirty(leaf
);
4561 ret
= remove_extent_backref(trans
, extent_root
, path
,
4568 BUG_ON(is_data
&& refs_to_drop
!=
4569 extent_data_ref_count(root
, path
, iref
));
4571 BUG_ON(path
->slots
[0] != extent_slot
);
4573 BUG_ON(path
->slots
[0] != extent_slot
+ 1);
4574 path
->slots
[0] = extent_slot
;
4579 ret
= btrfs_del_items(trans
, extent_root
, path
, path
->slots
[0],
4582 btrfs_release_path(extent_root
, path
);
4585 ret
= btrfs_del_csums(trans
, root
, bytenr
, num_bytes
);
4588 invalidate_mapping_pages(info
->btree_inode
->i_mapping
,
4589 bytenr
>> PAGE_CACHE_SHIFT
,
4590 (bytenr
+ num_bytes
- 1) >> PAGE_CACHE_SHIFT
);
4593 ret
= update_block_group(trans
, root
, bytenr
, num_bytes
, 0);
4596 btrfs_free_path(path
);
4601 * when we free an block, it is possible (and likely) that we free the last
4602 * delayed ref for that extent as well. This searches the delayed ref tree for
4603 * a given extent, and if there are no other delayed refs to be processed, it
4604 * removes it from the tree.
4606 static noinline
int check_ref_cleanup(struct btrfs_trans_handle
*trans
,
4607 struct btrfs_root
*root
, u64 bytenr
)
4609 struct btrfs_delayed_ref_head
*head
;
4610 struct btrfs_delayed_ref_root
*delayed_refs
;
4611 struct btrfs_delayed_ref_node
*ref
;
4612 struct rb_node
*node
;
4615 delayed_refs
= &trans
->transaction
->delayed_refs
;
4616 spin_lock(&delayed_refs
->lock
);
4617 head
= btrfs_find_delayed_ref_head(trans
, bytenr
);
4621 node
= rb_prev(&head
->node
.rb_node
);
4625 ref
= rb_entry(node
, struct btrfs_delayed_ref_node
, rb_node
);
4627 /* there are still entries for this ref, we can't drop it */
4628 if (ref
->bytenr
== bytenr
)
4631 if (head
->extent_op
) {
4632 if (!head
->must_insert_reserved
)
4634 kfree(head
->extent_op
);
4635 head
->extent_op
= NULL
;
4639 * waiting for the lock here would deadlock. If someone else has it
4640 * locked they are already in the process of dropping it anyway
4642 if (!mutex_trylock(&head
->mutex
))
4646 * at this point we have a head with no other entries. Go
4647 * ahead and process it.
4649 head
->node
.in_tree
= 0;
4650 rb_erase(&head
->node
.rb_node
, &delayed_refs
->root
);
4652 delayed_refs
->num_entries
--;
4655 * we don't take a ref on the node because we're removing it from the
4656 * tree, so we just steal the ref the tree was holding.
4658 delayed_refs
->num_heads
--;
4659 if (list_empty(&head
->cluster
))
4660 delayed_refs
->num_heads_ready
--;
4662 list_del_init(&head
->cluster
);
4663 spin_unlock(&delayed_refs
->lock
);
4665 BUG_ON(head
->extent_op
);
4666 if (head
->must_insert_reserved
)
4669 mutex_unlock(&head
->mutex
);
4670 btrfs_put_delayed_ref(&head
->node
);
4673 spin_unlock(&delayed_refs
->lock
);
4677 void btrfs_free_tree_block(struct btrfs_trans_handle
*trans
,
4678 struct btrfs_root
*root
,
4679 struct extent_buffer
*buf
,
4680 u64 parent
, int last_ref
)
4682 struct btrfs_block_rsv
*block_rsv
;
4683 struct btrfs_block_group_cache
*cache
= NULL
;
4686 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
4687 ret
= btrfs_add_delayed_tree_ref(trans
, buf
->start
, buf
->len
,
4688 parent
, root
->root_key
.objectid
,
4689 btrfs_header_level(buf
),
4690 BTRFS_DROP_DELAYED_REF
, NULL
);
4697 block_rsv
= get_block_rsv(trans
, root
);
4698 cache
= btrfs_lookup_block_group(root
->fs_info
, buf
->start
);
4699 if (block_rsv
->space_info
!= cache
->space_info
)
4702 if (btrfs_header_generation(buf
) == trans
->transid
) {
4703 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
4704 ret
= check_ref_cleanup(trans
, root
, buf
->start
);
4709 if (btrfs_header_flag(buf
, BTRFS_HEADER_FLAG_WRITTEN
)) {
4710 pin_down_extent(root
, cache
, buf
->start
, buf
->len
, 1);
4714 WARN_ON(test_bit(EXTENT_BUFFER_DIRTY
, &buf
->bflags
));
4716 btrfs_add_free_space(cache
, buf
->start
, buf
->len
);
4717 ret
= update_reserved_bytes(cache
, buf
->len
, 0, 0);
4718 if (ret
== -EAGAIN
) {
4719 /* block group became read-only */
4720 update_reserved_bytes(cache
, buf
->len
, 0, 1);
4725 spin_lock(&block_rsv
->lock
);
4726 if (block_rsv
->reserved
< block_rsv
->size
) {
4727 block_rsv
->reserved
+= buf
->len
;
4730 spin_unlock(&block_rsv
->lock
);
4733 spin_lock(&cache
->space_info
->lock
);
4734 cache
->space_info
->bytes_reserved
-= buf
->len
;
4735 cache
->space_info
->reservation_progress
++;
4736 spin_unlock(&cache
->space_info
->lock
);
4741 if (block_rsv
->durable
&& !cache
->ro
) {
4743 spin_lock(&cache
->lock
);
4745 cache
->reserved_pinned
+= buf
->len
;
4748 spin_unlock(&cache
->lock
);
4751 spin_lock(&block_rsv
->lock
);
4752 block_rsv
->freed
[trans
->transid
& 0x1] += buf
->len
;
4753 spin_unlock(&block_rsv
->lock
);
4758 * Deleting the buffer, clear the corrupt flag since it doesn't matter
4761 clear_bit(EXTENT_BUFFER_CORRUPT
, &buf
->bflags
);
4762 btrfs_put_block_group(cache
);
4765 int btrfs_free_extent(struct btrfs_trans_handle
*trans
,
4766 struct btrfs_root
*root
,
4767 u64 bytenr
, u64 num_bytes
, u64 parent
,
4768 u64 root_objectid
, u64 owner
, u64 offset
)
4773 * tree log blocks never actually go into the extent allocation
4774 * tree, just update pinning info and exit early.
4776 if (root_objectid
== BTRFS_TREE_LOG_OBJECTID
) {
4777 WARN_ON(owner
>= BTRFS_FIRST_FREE_OBJECTID
);
4778 /* unlocks the pinned mutex */
4779 btrfs_pin_extent(root
, bytenr
, num_bytes
, 1);
4781 } else if (owner
< BTRFS_FIRST_FREE_OBJECTID
) {
4782 ret
= btrfs_add_delayed_tree_ref(trans
, bytenr
, num_bytes
,
4783 parent
, root_objectid
, (int)owner
,
4784 BTRFS_DROP_DELAYED_REF
, NULL
);
4787 ret
= btrfs_add_delayed_data_ref(trans
, bytenr
, num_bytes
,
4788 parent
, root_objectid
, owner
,
4789 offset
, BTRFS_DROP_DELAYED_REF
, NULL
);
4795 static u64
stripe_align(struct btrfs_root
*root
, u64 val
)
4797 u64 mask
= ((u64
)root
->stripesize
- 1);
4798 u64 ret
= (val
+ mask
) & ~mask
;
4803 * when we wait for progress in the block group caching, its because
4804 * our allocation attempt failed at least once. So, we must sleep
4805 * and let some progress happen before we try again.
4807 * This function will sleep at least once waiting for new free space to
4808 * show up, and then it will check the block group free space numbers
4809 * for our min num_bytes. Another option is to have it go ahead
4810 * and look in the rbtree for a free extent of a given size, but this
4814 wait_block_group_cache_progress(struct btrfs_block_group_cache
*cache
,
4817 struct btrfs_caching_control
*caching_ctl
;
4820 caching_ctl
= get_caching_control(cache
);
4824 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
) ||
4825 (cache
->free_space
>= num_bytes
));
4827 put_caching_control(caching_ctl
);
4832 wait_block_group_cache_done(struct btrfs_block_group_cache
*cache
)
4834 struct btrfs_caching_control
*caching_ctl
;
4837 caching_ctl
= get_caching_control(cache
);
4841 wait_event(caching_ctl
->wait
, block_group_cache_done(cache
));
4843 put_caching_control(caching_ctl
);
4847 static int get_block_group_index(struct btrfs_block_group_cache
*cache
)
4850 if (cache
->flags
& BTRFS_BLOCK_GROUP_RAID10
)
4852 else if (cache
->flags
& BTRFS_BLOCK_GROUP_RAID1
)
4854 else if (cache
->flags
& BTRFS_BLOCK_GROUP_DUP
)
4856 else if (cache
->flags
& BTRFS_BLOCK_GROUP_RAID0
)
4863 enum btrfs_loop_type
{
4864 LOOP_FIND_IDEAL
= 0,
4865 LOOP_CACHING_NOWAIT
= 1,
4866 LOOP_CACHING_WAIT
= 2,
4867 LOOP_ALLOC_CHUNK
= 3,
4868 LOOP_NO_EMPTY_SIZE
= 4,
4872 * walks the btree of allocated extents and find a hole of a given size.
4873 * The key ins is changed to record the hole:
4874 * ins->objectid == block start
4875 * ins->flags = BTRFS_EXTENT_ITEM_KEY
4876 * ins->offset == number of blocks
4877 * Any available blocks before search_start are skipped.
4879 static noinline
int find_free_extent(struct btrfs_trans_handle
*trans
,
4880 struct btrfs_root
*orig_root
,
4881 u64 num_bytes
, u64 empty_size
,
4882 u64 search_start
, u64 search_end
,
4883 u64 hint_byte
, struct btrfs_key
*ins
,
4887 struct btrfs_root
*root
= orig_root
->fs_info
->extent_root
;
4888 struct btrfs_free_cluster
*last_ptr
= NULL
;
4889 struct btrfs_block_group_cache
*block_group
= NULL
;
4890 int empty_cluster
= 2 * 1024 * 1024;
4891 int allowed_chunk_alloc
= 0;
4892 int done_chunk_alloc
= 0;
4893 struct btrfs_space_info
*space_info
;
4894 int last_ptr_loop
= 0;
4897 bool found_uncached_bg
= false;
4898 bool failed_cluster_refill
= false;
4899 bool failed_alloc
= false;
4900 bool use_cluster
= true;
4901 u64 ideal_cache_percent
= 0;
4902 u64 ideal_cache_offset
= 0;
4904 WARN_ON(num_bytes
< root
->sectorsize
);
4905 btrfs_set_key_type(ins
, BTRFS_EXTENT_ITEM_KEY
);
4909 space_info
= __find_space_info(root
->fs_info
, data
);
4911 printk(KERN_ERR
"No space info for %d\n", data
);
4916 * If the space info is for both data and metadata it means we have a
4917 * small filesystem and we can't use the clustering stuff.
4919 if (btrfs_mixed_space_info(space_info
))
4920 use_cluster
= false;
4922 if (orig_root
->ref_cows
|| empty_size
)
4923 allowed_chunk_alloc
= 1;
4925 if (data
& BTRFS_BLOCK_GROUP_METADATA
&& use_cluster
) {
4926 last_ptr
= &root
->fs_info
->meta_alloc_cluster
;
4927 if (!btrfs_test_opt(root
, SSD
))
4928 empty_cluster
= 64 * 1024;
4931 if ((data
& BTRFS_BLOCK_GROUP_DATA
) && use_cluster
&&
4932 btrfs_test_opt(root
, SSD
)) {
4933 last_ptr
= &root
->fs_info
->data_alloc_cluster
;
4937 spin_lock(&last_ptr
->lock
);
4938 if (last_ptr
->block_group
)
4939 hint_byte
= last_ptr
->window_start
;
4940 spin_unlock(&last_ptr
->lock
);
4943 search_start
= max(search_start
, first_logical_byte(root
, 0));
4944 search_start
= max(search_start
, hint_byte
);
4949 if (search_start
== hint_byte
) {
4951 block_group
= btrfs_lookup_block_group(root
->fs_info
,
4954 * we don't want to use the block group if it doesn't match our
4955 * allocation bits, or if its not cached.
4957 * However if we are re-searching with an ideal block group
4958 * picked out then we don't care that the block group is cached.
4960 if (block_group
&& block_group_bits(block_group
, data
) &&
4961 (block_group
->cached
!= BTRFS_CACHE_NO
||
4962 search_start
== ideal_cache_offset
)) {
4963 down_read(&space_info
->groups_sem
);
4964 if (list_empty(&block_group
->list
) ||
4967 * someone is removing this block group,
4968 * we can't jump into the have_block_group
4969 * target because our list pointers are not
4972 btrfs_put_block_group(block_group
);
4973 up_read(&space_info
->groups_sem
);
4975 index
= get_block_group_index(block_group
);
4976 goto have_block_group
;
4978 } else if (block_group
) {
4979 btrfs_put_block_group(block_group
);
4983 down_read(&space_info
->groups_sem
);
4984 list_for_each_entry(block_group
, &space_info
->block_groups
[index
],
4989 btrfs_get_block_group(block_group
);
4990 search_start
= block_group
->key
.objectid
;
4993 * this can happen if we end up cycling through all the
4994 * raid types, but we want to make sure we only allocate
4995 * for the proper type.
4997 if (!block_group_bits(block_group
, data
)) {
4998 u64 extra
= BTRFS_BLOCK_GROUP_DUP
|
4999 BTRFS_BLOCK_GROUP_RAID1
|
5000 BTRFS_BLOCK_GROUP_RAID10
;
5003 * if they asked for extra copies and this block group
5004 * doesn't provide them, bail. This does allow us to
5005 * fill raid0 from raid1.
5007 if ((data
& extra
) && !(block_group
->flags
& extra
))
5012 if (unlikely(block_group
->cached
== BTRFS_CACHE_NO
)) {
5015 ret
= cache_block_group(block_group
, trans
,
5017 if (block_group
->cached
== BTRFS_CACHE_FINISHED
)
5018 goto have_block_group
;
5020 free_percent
= btrfs_block_group_used(&block_group
->item
);
5021 free_percent
*= 100;
5022 free_percent
= div64_u64(free_percent
,
5023 block_group
->key
.offset
);
5024 free_percent
= 100 - free_percent
;
5025 if (free_percent
> ideal_cache_percent
&&
5026 likely(!block_group
->ro
)) {
5027 ideal_cache_offset
= block_group
->key
.objectid
;
5028 ideal_cache_percent
= free_percent
;
5032 * We only want to start kthread caching if we are at
5033 * the point where we will wait for caching to make
5034 * progress, or if our ideal search is over and we've
5035 * found somebody to start caching.
5037 if (loop
> LOOP_CACHING_NOWAIT
||
5038 (loop
> LOOP_FIND_IDEAL
&&
5039 atomic_read(&space_info
->caching_threads
) < 2)) {
5040 ret
= cache_block_group(block_group
, trans
,
5044 found_uncached_bg
= true;
5047 * If loop is set for cached only, try the next block
5050 if (loop
== LOOP_FIND_IDEAL
)
5054 cached
= block_group_cache_done(block_group
);
5055 if (unlikely(!cached
))
5056 found_uncached_bg
= true;
5058 if (unlikely(block_group
->ro
))
5062 * Ok we want to try and use the cluster allocator, so lets look
5063 * there, unless we are on LOOP_NO_EMPTY_SIZE, since we will
5064 * have tried the cluster allocator plenty of times at this
5065 * point and not have found anything, so we are likely way too
5066 * fragmented for the clustering stuff to find anything, so lets
5067 * just skip it and let the allocator find whatever block it can
5070 if (last_ptr
&& loop
< LOOP_NO_EMPTY_SIZE
) {
5072 * the refill lock keeps out other
5073 * people trying to start a new cluster
5075 spin_lock(&last_ptr
->refill_lock
);
5076 if (last_ptr
->block_group
&&
5077 (last_ptr
->block_group
->ro
||
5078 !block_group_bits(last_ptr
->block_group
, data
))) {
5080 goto refill_cluster
;
5083 offset
= btrfs_alloc_from_cluster(block_group
, last_ptr
,
5084 num_bytes
, search_start
);
5086 /* we have a block, we're done */
5087 spin_unlock(&last_ptr
->refill_lock
);
5091 spin_lock(&last_ptr
->lock
);
5093 * whoops, this cluster doesn't actually point to
5094 * this block group. Get a ref on the block
5095 * group is does point to and try again
5097 if (!last_ptr_loop
&& last_ptr
->block_group
&&
5098 last_ptr
->block_group
!= block_group
) {
5100 btrfs_put_block_group(block_group
);
5101 block_group
= last_ptr
->block_group
;
5102 btrfs_get_block_group(block_group
);
5103 spin_unlock(&last_ptr
->lock
);
5104 spin_unlock(&last_ptr
->refill_lock
);
5107 search_start
= block_group
->key
.objectid
;
5109 * we know this block group is properly
5110 * in the list because
5111 * btrfs_remove_block_group, drops the
5112 * cluster before it removes the block
5113 * group from the list
5115 goto have_block_group
;
5117 spin_unlock(&last_ptr
->lock
);
5120 * this cluster didn't work out, free it and
5123 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
5127 /* allocate a cluster in this block group */
5128 ret
= btrfs_find_space_cluster(trans
, root
,
5129 block_group
, last_ptr
,
5131 empty_cluster
+ empty_size
);
5134 * now pull our allocation out of this
5137 offset
= btrfs_alloc_from_cluster(block_group
,
5138 last_ptr
, num_bytes
,
5141 /* we found one, proceed */
5142 spin_unlock(&last_ptr
->refill_lock
);
5145 } else if (!cached
&& loop
> LOOP_CACHING_NOWAIT
5146 && !failed_cluster_refill
) {
5147 spin_unlock(&last_ptr
->refill_lock
);
5149 failed_cluster_refill
= true;
5150 wait_block_group_cache_progress(block_group
,
5151 num_bytes
+ empty_cluster
+ empty_size
);
5152 goto have_block_group
;
5156 * at this point we either didn't find a cluster
5157 * or we weren't able to allocate a block from our
5158 * cluster. Free the cluster we've been trying
5159 * to use, and go to the next block group
5161 btrfs_return_cluster_to_free_space(NULL
, last_ptr
);
5162 spin_unlock(&last_ptr
->refill_lock
);
5166 offset
= btrfs_find_space_for_alloc(block_group
, search_start
,
5167 num_bytes
, empty_size
);
5169 * If we didn't find a chunk, and we haven't failed on this
5170 * block group before, and this block group is in the middle of
5171 * caching and we are ok with waiting, then go ahead and wait
5172 * for progress to be made, and set failed_alloc to true.
5174 * If failed_alloc is true then we've already waited on this
5175 * block group once and should move on to the next block group.
5177 if (!offset
&& !failed_alloc
&& !cached
&&
5178 loop
> LOOP_CACHING_NOWAIT
) {
5179 wait_block_group_cache_progress(block_group
,
5180 num_bytes
+ empty_size
);
5181 failed_alloc
= true;
5182 goto have_block_group
;
5183 } else if (!offset
) {
5187 search_start
= stripe_align(root
, offset
);
5188 /* move on to the next group */
5189 if (search_start
+ num_bytes
>= search_end
) {
5190 btrfs_add_free_space(block_group
, offset
, num_bytes
);
5194 /* move on to the next group */
5195 if (search_start
+ num_bytes
>
5196 block_group
->key
.objectid
+ block_group
->key
.offset
) {
5197 btrfs_add_free_space(block_group
, offset
, num_bytes
);
5201 ins
->objectid
= search_start
;
5202 ins
->offset
= num_bytes
;
5204 if (offset
< search_start
)
5205 btrfs_add_free_space(block_group
, offset
,
5206 search_start
- offset
);
5207 BUG_ON(offset
> search_start
);
5209 ret
= update_reserved_bytes(block_group
, num_bytes
, 1,
5210 (data
& BTRFS_BLOCK_GROUP_DATA
));
5211 if (ret
== -EAGAIN
) {
5212 btrfs_add_free_space(block_group
, offset
, num_bytes
);
5216 /* we are all good, lets return */
5217 ins
->objectid
= search_start
;
5218 ins
->offset
= num_bytes
;
5220 if (offset
< search_start
)
5221 btrfs_add_free_space(block_group
, offset
,
5222 search_start
- offset
);
5223 BUG_ON(offset
> search_start
);
5226 failed_cluster_refill
= false;
5227 failed_alloc
= false;
5228 BUG_ON(index
!= get_block_group_index(block_group
));
5229 btrfs_put_block_group(block_group
);
5231 up_read(&space_info
->groups_sem
);
5233 if (!ins
->objectid
&& ++index
< BTRFS_NR_RAID_TYPES
)
5236 /* LOOP_FIND_IDEAL, only search caching/cached bg's, and don't wait for
5237 * for them to make caching progress. Also
5238 * determine the best possible bg to cache
5239 * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking
5240 * caching kthreads as we move along
5241 * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching
5242 * LOOP_ALLOC_CHUNK, force a chunk allocation and try again
5243 * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
5246 if (!ins
->objectid
&& loop
< LOOP_NO_EMPTY_SIZE
&&
5247 (found_uncached_bg
|| empty_size
|| empty_cluster
||
5248 allowed_chunk_alloc
)) {
5250 if (loop
== LOOP_FIND_IDEAL
&& found_uncached_bg
) {
5251 found_uncached_bg
= false;
5253 if (!ideal_cache_percent
&&
5254 atomic_read(&space_info
->caching_threads
))
5258 * 1 of the following 2 things have happened so far
5260 * 1) We found an ideal block group for caching that
5261 * is mostly full and will cache quickly, so we might
5262 * as well wait for it.
5264 * 2) We searched for cached only and we didn't find
5265 * anything, and we didn't start any caching kthreads
5266 * either, so chances are we will loop through and
5267 * start a couple caching kthreads, and then come back
5268 * around and just wait for them. This will be slower
5269 * because we will have 2 caching kthreads reading at
5270 * the same time when we could have just started one
5271 * and waited for it to get far enough to give us an
5272 * allocation, so go ahead and go to the wait caching
5275 loop
= LOOP_CACHING_WAIT
;
5276 search_start
= ideal_cache_offset
;
5277 ideal_cache_percent
= 0;
5279 } else if (loop
== LOOP_FIND_IDEAL
) {
5281 * Didn't find a uncached bg, wait on anything we find
5284 loop
= LOOP_CACHING_WAIT
;
5288 if (loop
< LOOP_CACHING_WAIT
) {
5293 if (loop
== LOOP_ALLOC_CHUNK
) {
5298 if (allowed_chunk_alloc
) {
5299 ret
= do_chunk_alloc(trans
, root
, num_bytes
+
5300 2 * 1024 * 1024, data
, 1);
5301 allowed_chunk_alloc
= 0;
5302 done_chunk_alloc
= 1;
5303 } else if (!done_chunk_alloc
) {
5304 space_info
->force_alloc
= 1;
5307 if (loop
< LOOP_NO_EMPTY_SIZE
) {
5312 } else if (!ins
->objectid
) {
5316 /* we found what we needed */
5317 if (ins
->objectid
) {
5318 if (!(data
& BTRFS_BLOCK_GROUP_DATA
))
5319 trans
->block_group
= block_group
->key
.objectid
;
5321 btrfs_put_block_group(block_group
);
5328 static void dump_space_info(struct btrfs_space_info
*info
, u64 bytes
,
5329 int dump_block_groups
)
5331 struct btrfs_block_group_cache
*cache
;
5334 spin_lock(&info
->lock
);
5335 printk(KERN_INFO
"space_info has %llu free, is %sfull\n",
5336 (unsigned long long)(info
->total_bytes
- info
->bytes_used
-
5337 info
->bytes_pinned
- info
->bytes_reserved
-
5338 info
->bytes_readonly
),
5339 (info
->full
) ? "" : "not ");
5340 printk(KERN_INFO
"space_info total=%llu, used=%llu, pinned=%llu, "
5341 "reserved=%llu, may_use=%llu, readonly=%llu\n",
5342 (unsigned long long)info
->total_bytes
,
5343 (unsigned long long)info
->bytes_used
,
5344 (unsigned long long)info
->bytes_pinned
,
5345 (unsigned long long)info
->bytes_reserved
,
5346 (unsigned long long)info
->bytes_may_use
,
5347 (unsigned long long)info
->bytes_readonly
);
5348 spin_unlock(&info
->lock
);
5350 if (!dump_block_groups
)
5353 down_read(&info
->groups_sem
);
5355 list_for_each_entry(cache
, &info
->block_groups
[index
], list
) {
5356 spin_lock(&cache
->lock
);
5357 printk(KERN_INFO
"block group %llu has %llu bytes, %llu used "
5358 "%llu pinned %llu reserved\n",
5359 (unsigned long long)cache
->key
.objectid
,
5360 (unsigned long long)cache
->key
.offset
,
5361 (unsigned long long)btrfs_block_group_used(&cache
->item
),
5362 (unsigned long long)cache
->pinned
,
5363 (unsigned long long)cache
->reserved
);
5364 btrfs_dump_free_space(cache
, bytes
);
5365 spin_unlock(&cache
->lock
);
5367 if (++index
< BTRFS_NR_RAID_TYPES
)
5369 up_read(&info
->groups_sem
);
5372 int btrfs_reserve_extent(struct btrfs_trans_handle
*trans
,
5373 struct btrfs_root
*root
,
5374 u64 num_bytes
, u64 min_alloc_size
,
5375 u64 empty_size
, u64 hint_byte
,
5376 u64 search_end
, struct btrfs_key
*ins
,
5380 u64 search_start
= 0;
5382 data
= btrfs_get_alloc_profile(root
, data
);
5385 * the only place that sets empty_size is btrfs_realloc_node, which
5386 * is not called recursively on allocations
5388 if (empty_size
|| root
->ref_cows
)
5389 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
5390 num_bytes
+ 2 * 1024 * 1024, data
, 0);
5392 WARN_ON(num_bytes
< root
->sectorsize
);
5393 ret
= find_free_extent(trans
, root
, num_bytes
, empty_size
,
5394 search_start
, search_end
, hint_byte
,
5397 if (ret
== -ENOSPC
&& num_bytes
> min_alloc_size
) {
5398 num_bytes
= num_bytes
>> 1;
5399 num_bytes
= num_bytes
& ~(root
->sectorsize
- 1);
5400 num_bytes
= max(num_bytes
, min_alloc_size
);
5401 do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
5402 num_bytes
, data
, 1);
5405 if (ret
== -ENOSPC
&& btrfs_test_opt(root
, ENOSPC_DEBUG
)) {
5406 struct btrfs_space_info
*sinfo
;
5408 sinfo
= __find_space_info(root
->fs_info
, data
);
5409 printk(KERN_ERR
"btrfs allocation failed flags %llu, "
5410 "wanted %llu\n", (unsigned long long)data
,
5411 (unsigned long long)num_bytes
);
5412 dump_space_info(sinfo
, num_bytes
, 1);
5418 int btrfs_free_reserved_extent(struct btrfs_root
*root
, u64 start
, u64 len
)
5420 struct btrfs_block_group_cache
*cache
;
5423 cache
= btrfs_lookup_block_group(root
->fs_info
, start
);
5425 printk(KERN_ERR
"Unable to find block group for %llu\n",
5426 (unsigned long long)start
);
5430 ret
= btrfs_discard_extent(root
, start
, len
);
5432 btrfs_add_free_space(cache
, start
, len
);
5433 update_reserved_bytes(cache
, len
, 0, 1);
5434 btrfs_put_block_group(cache
);
5439 static int alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
5440 struct btrfs_root
*root
,
5441 u64 parent
, u64 root_objectid
,
5442 u64 flags
, u64 owner
, u64 offset
,
5443 struct btrfs_key
*ins
, int ref_mod
)
5446 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5447 struct btrfs_extent_item
*extent_item
;
5448 struct btrfs_extent_inline_ref
*iref
;
5449 struct btrfs_path
*path
;
5450 struct extent_buffer
*leaf
;
5455 type
= BTRFS_SHARED_DATA_REF_KEY
;
5457 type
= BTRFS_EXTENT_DATA_REF_KEY
;
5459 size
= sizeof(*extent_item
) + btrfs_extent_inline_ref_size(type
);
5461 path
= btrfs_alloc_path();
5464 path
->leave_spinning
= 1;
5465 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
5469 leaf
= path
->nodes
[0];
5470 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
5471 struct btrfs_extent_item
);
5472 btrfs_set_extent_refs(leaf
, extent_item
, ref_mod
);
5473 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
5474 btrfs_set_extent_flags(leaf
, extent_item
,
5475 flags
| BTRFS_EXTENT_FLAG_DATA
);
5477 iref
= (struct btrfs_extent_inline_ref
*)(extent_item
+ 1);
5478 btrfs_set_extent_inline_ref_type(leaf
, iref
, type
);
5480 struct btrfs_shared_data_ref
*ref
;
5481 ref
= (struct btrfs_shared_data_ref
*)(iref
+ 1);
5482 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
5483 btrfs_set_shared_data_ref_count(leaf
, ref
, ref_mod
);
5485 struct btrfs_extent_data_ref
*ref
;
5486 ref
= (struct btrfs_extent_data_ref
*)(&iref
->offset
);
5487 btrfs_set_extent_data_ref_root(leaf
, ref
, root_objectid
);
5488 btrfs_set_extent_data_ref_objectid(leaf
, ref
, owner
);
5489 btrfs_set_extent_data_ref_offset(leaf
, ref
, offset
);
5490 btrfs_set_extent_data_ref_count(leaf
, ref
, ref_mod
);
5493 btrfs_mark_buffer_dirty(path
->nodes
[0]);
5494 btrfs_free_path(path
);
5496 ret
= update_block_group(trans
, root
, ins
->objectid
, ins
->offset
, 1);
5498 printk(KERN_ERR
"btrfs update block group failed for %llu "
5499 "%llu\n", (unsigned long long)ins
->objectid
,
5500 (unsigned long long)ins
->offset
);
5506 static int alloc_reserved_tree_block(struct btrfs_trans_handle
*trans
,
5507 struct btrfs_root
*root
,
5508 u64 parent
, u64 root_objectid
,
5509 u64 flags
, struct btrfs_disk_key
*key
,
5510 int level
, struct btrfs_key
*ins
)
5513 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5514 struct btrfs_extent_item
*extent_item
;
5515 struct btrfs_tree_block_info
*block_info
;
5516 struct btrfs_extent_inline_ref
*iref
;
5517 struct btrfs_path
*path
;
5518 struct extent_buffer
*leaf
;
5519 u32 size
= sizeof(*extent_item
) + sizeof(*block_info
) + sizeof(*iref
);
5521 path
= btrfs_alloc_path();
5524 path
->leave_spinning
= 1;
5525 ret
= btrfs_insert_empty_item(trans
, fs_info
->extent_root
, path
,
5529 leaf
= path
->nodes
[0];
5530 extent_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
5531 struct btrfs_extent_item
);
5532 btrfs_set_extent_refs(leaf
, extent_item
, 1);
5533 btrfs_set_extent_generation(leaf
, extent_item
, trans
->transid
);
5534 btrfs_set_extent_flags(leaf
, extent_item
,
5535 flags
| BTRFS_EXTENT_FLAG_TREE_BLOCK
);
5536 block_info
= (struct btrfs_tree_block_info
*)(extent_item
+ 1);
5538 btrfs_set_tree_block_key(leaf
, block_info
, key
);
5539 btrfs_set_tree_block_level(leaf
, block_info
, level
);
5541 iref
= (struct btrfs_extent_inline_ref
*)(block_info
+ 1);
5543 BUG_ON(!(flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
));
5544 btrfs_set_extent_inline_ref_type(leaf
, iref
,
5545 BTRFS_SHARED_BLOCK_REF_KEY
);
5546 btrfs_set_extent_inline_ref_offset(leaf
, iref
, parent
);
5548 btrfs_set_extent_inline_ref_type(leaf
, iref
,
5549 BTRFS_TREE_BLOCK_REF_KEY
);
5550 btrfs_set_extent_inline_ref_offset(leaf
, iref
, root_objectid
);
5553 btrfs_mark_buffer_dirty(leaf
);
5554 btrfs_free_path(path
);
5556 ret
= update_block_group(trans
, root
, ins
->objectid
, ins
->offset
, 1);
5558 printk(KERN_ERR
"btrfs update block group failed for %llu "
5559 "%llu\n", (unsigned long long)ins
->objectid
,
5560 (unsigned long long)ins
->offset
);
5566 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle
*trans
,
5567 struct btrfs_root
*root
,
5568 u64 root_objectid
, u64 owner
,
5569 u64 offset
, struct btrfs_key
*ins
)
5573 BUG_ON(root_objectid
== BTRFS_TREE_LOG_OBJECTID
);
5575 ret
= btrfs_add_delayed_data_ref(trans
, ins
->objectid
, ins
->offset
,
5576 0, root_objectid
, owner
, offset
,
5577 BTRFS_ADD_DELAYED_EXTENT
, NULL
);
5582 * this is used by the tree logging recovery code. It records that
5583 * an extent has been allocated and makes sure to clear the free
5584 * space cache bits as well
5586 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle
*trans
,
5587 struct btrfs_root
*root
,
5588 u64 root_objectid
, u64 owner
, u64 offset
,
5589 struct btrfs_key
*ins
)
5592 struct btrfs_block_group_cache
*block_group
;
5593 struct btrfs_caching_control
*caching_ctl
;
5594 u64 start
= ins
->objectid
;
5595 u64 num_bytes
= ins
->offset
;
5597 block_group
= btrfs_lookup_block_group(root
->fs_info
, ins
->objectid
);
5598 cache_block_group(block_group
, trans
, NULL
, 0);
5599 caching_ctl
= get_caching_control(block_group
);
5602 BUG_ON(!block_group_cache_done(block_group
));
5603 ret
= btrfs_remove_free_space(block_group
, start
, num_bytes
);
5606 mutex_lock(&caching_ctl
->mutex
);
5608 if (start
>= caching_ctl
->progress
) {
5609 ret
= add_excluded_extent(root
, start
, num_bytes
);
5611 } else if (start
+ num_bytes
<= caching_ctl
->progress
) {
5612 ret
= btrfs_remove_free_space(block_group
,
5616 num_bytes
= caching_ctl
->progress
- start
;
5617 ret
= btrfs_remove_free_space(block_group
,
5621 start
= caching_ctl
->progress
;
5622 num_bytes
= ins
->objectid
+ ins
->offset
-
5623 caching_ctl
->progress
;
5624 ret
= add_excluded_extent(root
, start
, num_bytes
);
5628 mutex_unlock(&caching_ctl
->mutex
);
5629 put_caching_control(caching_ctl
);
5632 ret
= update_reserved_bytes(block_group
, ins
->offset
, 1, 1);
5634 btrfs_put_block_group(block_group
);
5635 ret
= alloc_reserved_file_extent(trans
, root
, 0, root_objectid
,
5636 0, owner
, offset
, ins
, 1);
5640 struct extent_buffer
*btrfs_init_new_buffer(struct btrfs_trans_handle
*trans
,
5641 struct btrfs_root
*root
,
5642 u64 bytenr
, u32 blocksize
,
5645 struct extent_buffer
*buf
;
5647 buf
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
5649 return ERR_PTR(-ENOMEM
);
5650 btrfs_set_header_generation(buf
, trans
->transid
);
5651 btrfs_set_buffer_lockdep_class(buf
, level
);
5652 btrfs_tree_lock(buf
);
5653 clean_tree_block(trans
, root
, buf
);
5655 btrfs_set_lock_blocking(buf
);
5656 btrfs_set_buffer_uptodate(buf
);
5658 if (root
->root_key
.objectid
== BTRFS_TREE_LOG_OBJECTID
) {
5660 * we allow two log transactions at a time, use different
5661 * EXENT bit to differentiate dirty pages.
5663 if (root
->log_transid
% 2 == 0)
5664 set_extent_dirty(&root
->dirty_log_pages
, buf
->start
,
5665 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
5667 set_extent_new(&root
->dirty_log_pages
, buf
->start
,
5668 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
5670 set_extent_dirty(&trans
->transaction
->dirty_pages
, buf
->start
,
5671 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
5673 trans
->blocks_used
++;
5674 /* this returns a buffer locked for blocking */
5678 static struct btrfs_block_rsv
*
5679 use_block_rsv(struct btrfs_trans_handle
*trans
,
5680 struct btrfs_root
*root
, u32 blocksize
)
5682 struct btrfs_block_rsv
*block_rsv
;
5683 struct btrfs_block_rsv
*global_rsv
= &root
->fs_info
->global_block_rsv
;
5686 block_rsv
= get_block_rsv(trans
, root
);
5688 if (block_rsv
->size
== 0) {
5689 ret
= reserve_metadata_bytes(trans
, root
, block_rsv
,
5692 * If we couldn't reserve metadata bytes try and use some from
5693 * the global reserve.
5695 if (ret
&& block_rsv
!= global_rsv
) {
5696 ret
= block_rsv_use_bytes(global_rsv
, blocksize
);
5699 return ERR_PTR(ret
);
5701 return ERR_PTR(ret
);
5706 ret
= block_rsv_use_bytes(block_rsv
, blocksize
);
5711 ret
= reserve_metadata_bytes(trans
, root
, block_rsv
, blocksize
,
5714 spin_lock(&block_rsv
->lock
);
5715 block_rsv
->size
+= blocksize
;
5716 spin_unlock(&block_rsv
->lock
);
5718 } else if (ret
&& block_rsv
!= global_rsv
) {
5719 ret
= block_rsv_use_bytes(global_rsv
, blocksize
);
5725 return ERR_PTR(-ENOSPC
);
5728 static void unuse_block_rsv(struct btrfs_block_rsv
*block_rsv
, u32 blocksize
)
5730 block_rsv_add_bytes(block_rsv
, blocksize
, 0);
5731 block_rsv_release_bytes(block_rsv
, NULL
, 0);
5735 * finds a free extent and does all the dirty work required for allocation
5736 * returns the key for the extent through ins, and a tree buffer for
5737 * the first block of the extent through buf.
5739 * returns the tree buffer or NULL.
5741 struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
5742 struct btrfs_root
*root
, u32 blocksize
,
5743 u64 parent
, u64 root_objectid
,
5744 struct btrfs_disk_key
*key
, int level
,
5745 u64 hint
, u64 empty_size
)
5747 struct btrfs_key ins
;
5748 struct btrfs_block_rsv
*block_rsv
;
5749 struct extent_buffer
*buf
;
5754 block_rsv
= use_block_rsv(trans
, root
, blocksize
);
5755 if (IS_ERR(block_rsv
))
5756 return ERR_CAST(block_rsv
);
5758 ret
= btrfs_reserve_extent(trans
, root
, blocksize
, blocksize
,
5759 empty_size
, hint
, (u64
)-1, &ins
, 0);
5761 unuse_block_rsv(block_rsv
, blocksize
);
5762 return ERR_PTR(ret
);
5765 buf
= btrfs_init_new_buffer(trans
, root
, ins
.objectid
,
5767 BUG_ON(IS_ERR(buf
));
5769 if (root_objectid
== BTRFS_TREE_RELOC_OBJECTID
) {
5771 parent
= ins
.objectid
;
5772 flags
|= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
5776 if (root_objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
5777 struct btrfs_delayed_extent_op
*extent_op
;
5778 extent_op
= kmalloc(sizeof(*extent_op
), GFP_NOFS
);
5781 memcpy(&extent_op
->key
, key
, sizeof(extent_op
->key
));
5783 memset(&extent_op
->key
, 0, sizeof(extent_op
->key
));
5784 extent_op
->flags_to_set
= flags
;
5785 extent_op
->update_key
= 1;
5786 extent_op
->update_flags
= 1;
5787 extent_op
->is_data
= 0;
5789 ret
= btrfs_add_delayed_tree_ref(trans
, ins
.objectid
,
5790 ins
.offset
, parent
, root_objectid
,
5791 level
, BTRFS_ADD_DELAYED_EXTENT
,
5798 struct walk_control
{
5799 u64 refs
[BTRFS_MAX_LEVEL
];
5800 u64 flags
[BTRFS_MAX_LEVEL
];
5801 struct btrfs_key update_progress
;
5811 #define DROP_REFERENCE 1
5812 #define UPDATE_BACKREF 2
5814 static noinline
void reada_walk_down(struct btrfs_trans_handle
*trans
,
5815 struct btrfs_root
*root
,
5816 struct walk_control
*wc
,
5817 struct btrfs_path
*path
)
5825 struct btrfs_key key
;
5826 struct extent_buffer
*eb
;
5831 if (path
->slots
[wc
->level
] < wc
->reada_slot
) {
5832 wc
->reada_count
= wc
->reada_count
* 2 / 3;
5833 wc
->reada_count
= max(wc
->reada_count
, 2);
5835 wc
->reada_count
= wc
->reada_count
* 3 / 2;
5836 wc
->reada_count
= min_t(int, wc
->reada_count
,
5837 BTRFS_NODEPTRS_PER_BLOCK(root
));
5840 eb
= path
->nodes
[wc
->level
];
5841 nritems
= btrfs_header_nritems(eb
);
5842 blocksize
= btrfs_level_size(root
, wc
->level
- 1);
5844 for (slot
= path
->slots
[wc
->level
]; slot
< nritems
; slot
++) {
5845 if (nread
>= wc
->reada_count
)
5849 bytenr
= btrfs_node_blockptr(eb
, slot
);
5850 generation
= btrfs_node_ptr_generation(eb
, slot
);
5852 if (slot
== path
->slots
[wc
->level
])
5855 if (wc
->stage
== UPDATE_BACKREF
&&
5856 generation
<= root
->root_key
.offset
)
5859 /* We don't lock the tree block, it's OK to be racy here */
5860 ret
= btrfs_lookup_extent_info(trans
, root
, bytenr
, blocksize
,
5865 if (wc
->stage
== DROP_REFERENCE
) {
5869 if (wc
->level
== 1 &&
5870 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
5872 if (!wc
->update_ref
||
5873 generation
<= root
->root_key
.offset
)
5875 btrfs_node_key_to_cpu(eb
, &key
, slot
);
5876 ret
= btrfs_comp_cpu_keys(&key
,
5877 &wc
->update_progress
);
5881 if (wc
->level
== 1 &&
5882 (flags
& BTRFS_BLOCK_FLAG_FULL_BACKREF
))
5886 ret
= readahead_tree_block(root
, bytenr
, blocksize
,
5892 wc
->reada_slot
= slot
;
5896 * hepler to process tree block while walking down the tree.
5898 * when wc->stage == UPDATE_BACKREF, this function updates
5899 * back refs for pointers in the block.
5901 * NOTE: return value 1 means we should stop walking down.
5903 static noinline
int walk_down_proc(struct btrfs_trans_handle
*trans
,
5904 struct btrfs_root
*root
,
5905 struct btrfs_path
*path
,
5906 struct walk_control
*wc
, int lookup_info
)
5908 int level
= wc
->level
;
5909 struct extent_buffer
*eb
= path
->nodes
[level
];
5910 u64 flag
= BTRFS_BLOCK_FLAG_FULL_BACKREF
;
5913 if (wc
->stage
== UPDATE_BACKREF
&&
5914 btrfs_header_owner(eb
) != root
->root_key
.objectid
)
5918 * when reference count of tree block is 1, it won't increase
5919 * again. once full backref flag is set, we never clear it.
5922 ((wc
->stage
== DROP_REFERENCE
&& wc
->refs
[level
] != 1) ||
5923 (wc
->stage
== UPDATE_BACKREF
&& !(wc
->flags
[level
] & flag
)))) {
5924 BUG_ON(!path
->locks
[level
]);
5925 ret
= btrfs_lookup_extent_info(trans
, root
,
5930 BUG_ON(wc
->refs
[level
] == 0);
5933 if (wc
->stage
== DROP_REFERENCE
) {
5934 if (wc
->refs
[level
] > 1)
5937 if (path
->locks
[level
] && !wc
->keep_locks
) {
5938 btrfs_tree_unlock(eb
);
5939 path
->locks
[level
] = 0;
5944 /* wc->stage == UPDATE_BACKREF */
5945 if (!(wc
->flags
[level
] & flag
)) {
5946 BUG_ON(!path
->locks
[level
]);
5947 ret
= btrfs_inc_ref(trans
, root
, eb
, 1);
5949 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
5951 ret
= btrfs_set_disk_extent_flags(trans
, root
, eb
->start
,
5954 wc
->flags
[level
] |= flag
;
5958 * the block is shared by multiple trees, so it's not good to
5959 * keep the tree lock
5961 if (path
->locks
[level
] && level
> 0) {
5962 btrfs_tree_unlock(eb
);
5963 path
->locks
[level
] = 0;
5969 * hepler to process tree block pointer.
5971 * when wc->stage == DROP_REFERENCE, this function checks
5972 * reference count of the block pointed to. if the block
5973 * is shared and we need update back refs for the subtree
5974 * rooted at the block, this function changes wc->stage to
5975 * UPDATE_BACKREF. if the block is shared and there is no
5976 * need to update back, this function drops the reference
5979 * NOTE: return value 1 means we should stop walking down.
5981 static noinline
int do_walk_down(struct btrfs_trans_handle
*trans
,
5982 struct btrfs_root
*root
,
5983 struct btrfs_path
*path
,
5984 struct walk_control
*wc
, int *lookup_info
)
5990 struct btrfs_key key
;
5991 struct extent_buffer
*next
;
5992 int level
= wc
->level
;
5996 generation
= btrfs_node_ptr_generation(path
->nodes
[level
],
5997 path
->slots
[level
]);
5999 * if the lower level block was created before the snapshot
6000 * was created, we know there is no need to update back refs
6003 if (wc
->stage
== UPDATE_BACKREF
&&
6004 generation
<= root
->root_key
.offset
) {
6009 bytenr
= btrfs_node_blockptr(path
->nodes
[level
], path
->slots
[level
]);
6010 blocksize
= btrfs_level_size(root
, level
- 1);
6012 next
= btrfs_find_tree_block(root
, bytenr
, blocksize
);
6014 next
= btrfs_find_create_tree_block(root
, bytenr
, blocksize
);
6019 btrfs_tree_lock(next
);
6020 btrfs_set_lock_blocking(next
);
6022 ret
= btrfs_lookup_extent_info(trans
, root
, bytenr
, blocksize
,
6023 &wc
->refs
[level
- 1],
6024 &wc
->flags
[level
- 1]);
6026 BUG_ON(wc
->refs
[level
- 1] == 0);
6029 if (wc
->stage
== DROP_REFERENCE
) {
6030 if (wc
->refs
[level
- 1] > 1) {
6032 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
6035 if (!wc
->update_ref
||
6036 generation
<= root
->root_key
.offset
)
6039 btrfs_node_key_to_cpu(path
->nodes
[level
], &key
,
6040 path
->slots
[level
]);
6041 ret
= btrfs_comp_cpu_keys(&key
, &wc
->update_progress
);
6045 wc
->stage
= UPDATE_BACKREF
;
6046 wc
->shared_level
= level
- 1;
6050 (wc
->flags
[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF
))
6054 if (!btrfs_buffer_uptodate(next
, generation
)) {
6055 btrfs_tree_unlock(next
);
6056 free_extent_buffer(next
);
6062 if (reada
&& level
== 1)
6063 reada_walk_down(trans
, root
, wc
, path
);
6064 next
= read_tree_block(root
, bytenr
, blocksize
, generation
);
6065 btrfs_tree_lock(next
);
6066 btrfs_set_lock_blocking(next
);
6070 BUG_ON(level
!= btrfs_header_level(next
));
6071 path
->nodes
[level
] = next
;
6072 path
->slots
[level
] = 0;
6073 path
->locks
[level
] = 1;
6079 wc
->refs
[level
- 1] = 0;
6080 wc
->flags
[level
- 1] = 0;
6081 if (wc
->stage
== DROP_REFERENCE
) {
6082 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
) {
6083 parent
= path
->nodes
[level
]->start
;
6085 BUG_ON(root
->root_key
.objectid
!=
6086 btrfs_header_owner(path
->nodes
[level
]));
6090 ret
= btrfs_free_extent(trans
, root
, bytenr
, blocksize
, parent
,
6091 root
->root_key
.objectid
, level
- 1, 0);
6094 btrfs_tree_unlock(next
);
6095 free_extent_buffer(next
);
6101 * hepler to process tree block while walking up the tree.
6103 * when wc->stage == DROP_REFERENCE, this function drops
6104 * reference count on the block.
6106 * when wc->stage == UPDATE_BACKREF, this function changes
6107 * wc->stage back to DROP_REFERENCE if we changed wc->stage
6108 * to UPDATE_BACKREF previously while processing the block.
6110 * NOTE: return value 1 means we should stop walking up.
6112 static noinline
int walk_up_proc(struct btrfs_trans_handle
*trans
,
6113 struct btrfs_root
*root
,
6114 struct btrfs_path
*path
,
6115 struct walk_control
*wc
)
6118 int level
= wc
->level
;
6119 struct extent_buffer
*eb
= path
->nodes
[level
];
6122 if (wc
->stage
== UPDATE_BACKREF
) {
6123 BUG_ON(wc
->shared_level
< level
);
6124 if (level
< wc
->shared_level
)
6127 ret
= find_next_key(path
, level
+ 1, &wc
->update_progress
);
6131 wc
->stage
= DROP_REFERENCE
;
6132 wc
->shared_level
= -1;
6133 path
->slots
[level
] = 0;
6136 * check reference count again if the block isn't locked.
6137 * we should start walking down the tree again if reference
6140 if (!path
->locks
[level
]) {
6142 btrfs_tree_lock(eb
);
6143 btrfs_set_lock_blocking(eb
);
6144 path
->locks
[level
] = 1;
6146 ret
= btrfs_lookup_extent_info(trans
, root
,
6151 BUG_ON(wc
->refs
[level
] == 0);
6152 if (wc
->refs
[level
] == 1) {
6153 btrfs_tree_unlock(eb
);
6154 path
->locks
[level
] = 0;
6160 /* wc->stage == DROP_REFERENCE */
6161 BUG_ON(wc
->refs
[level
] > 1 && !path
->locks
[level
]);
6163 if (wc
->refs
[level
] == 1) {
6165 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
6166 ret
= btrfs_dec_ref(trans
, root
, eb
, 1);
6168 ret
= btrfs_dec_ref(trans
, root
, eb
, 0);
6171 /* make block locked assertion in clean_tree_block happy */
6172 if (!path
->locks
[level
] &&
6173 btrfs_header_generation(eb
) == trans
->transid
) {
6174 btrfs_tree_lock(eb
);
6175 btrfs_set_lock_blocking(eb
);
6176 path
->locks
[level
] = 1;
6178 clean_tree_block(trans
, root
, eb
);
6181 if (eb
== root
->node
) {
6182 if (wc
->flags
[level
] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
6185 BUG_ON(root
->root_key
.objectid
!=
6186 btrfs_header_owner(eb
));
6188 if (wc
->flags
[level
+ 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF
)
6189 parent
= path
->nodes
[level
+ 1]->start
;
6191 BUG_ON(root
->root_key
.objectid
!=
6192 btrfs_header_owner(path
->nodes
[level
+ 1]));
6195 btrfs_free_tree_block(trans
, root
, eb
, parent
, wc
->refs
[level
] == 1);
6197 wc
->refs
[level
] = 0;
6198 wc
->flags
[level
] = 0;
6202 static noinline
int walk_down_tree(struct btrfs_trans_handle
*trans
,
6203 struct btrfs_root
*root
,
6204 struct btrfs_path
*path
,
6205 struct walk_control
*wc
)
6207 int level
= wc
->level
;
6208 int lookup_info
= 1;
6211 while (level
>= 0) {
6212 ret
= walk_down_proc(trans
, root
, path
, wc
, lookup_info
);
6219 if (path
->slots
[level
] >=
6220 btrfs_header_nritems(path
->nodes
[level
]))
6223 ret
= do_walk_down(trans
, root
, path
, wc
, &lookup_info
);
6225 path
->slots
[level
]++;
6234 static noinline
int walk_up_tree(struct btrfs_trans_handle
*trans
,
6235 struct btrfs_root
*root
,
6236 struct btrfs_path
*path
,
6237 struct walk_control
*wc
, int max_level
)
6239 int level
= wc
->level
;
6242 path
->slots
[level
] = btrfs_header_nritems(path
->nodes
[level
]);
6243 while (level
< max_level
&& path
->nodes
[level
]) {
6245 if (path
->slots
[level
] + 1 <
6246 btrfs_header_nritems(path
->nodes
[level
])) {
6247 path
->slots
[level
]++;
6250 ret
= walk_up_proc(trans
, root
, path
, wc
);
6254 if (path
->locks
[level
]) {
6255 btrfs_tree_unlock(path
->nodes
[level
]);
6256 path
->locks
[level
] = 0;
6258 free_extent_buffer(path
->nodes
[level
]);
6259 path
->nodes
[level
] = NULL
;
6267 * drop a subvolume tree.
6269 * this function traverses the tree freeing any blocks that only
6270 * referenced by the tree.
6272 * when a shared tree block is found. this function decreases its
6273 * reference count by one. if update_ref is true, this function
6274 * also make sure backrefs for the shared block and all lower level
6275 * blocks are properly updated.
6277 int btrfs_drop_snapshot(struct btrfs_root
*root
,
6278 struct btrfs_block_rsv
*block_rsv
, int update_ref
)
6280 struct btrfs_path
*path
;
6281 struct btrfs_trans_handle
*trans
;
6282 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
6283 struct btrfs_root_item
*root_item
= &root
->root_item
;
6284 struct walk_control
*wc
;
6285 struct btrfs_key key
;
6290 path
= btrfs_alloc_path();
6293 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
6296 trans
= btrfs_start_transaction(tree_root
, 0);
6297 BUG_ON(IS_ERR(trans
));
6300 trans
->block_rsv
= block_rsv
;
6302 if (btrfs_disk_key_objectid(&root_item
->drop_progress
) == 0) {
6303 level
= btrfs_header_level(root
->node
);
6304 path
->nodes
[level
] = btrfs_lock_root_node(root
);
6305 btrfs_set_lock_blocking(path
->nodes
[level
]);
6306 path
->slots
[level
] = 0;
6307 path
->locks
[level
] = 1;
6308 memset(&wc
->update_progress
, 0,
6309 sizeof(wc
->update_progress
));
6311 btrfs_disk_key_to_cpu(&key
, &root_item
->drop_progress
);
6312 memcpy(&wc
->update_progress
, &key
,
6313 sizeof(wc
->update_progress
));
6315 level
= root_item
->drop_level
;
6317 path
->lowest_level
= level
;
6318 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
6319 path
->lowest_level
= 0;
6327 * unlock our path, this is safe because only this
6328 * function is allowed to delete this snapshot
6330 btrfs_unlock_up_safe(path
, 0);
6332 level
= btrfs_header_level(root
->node
);
6334 btrfs_tree_lock(path
->nodes
[level
]);
6335 btrfs_set_lock_blocking(path
->nodes
[level
]);
6337 ret
= btrfs_lookup_extent_info(trans
, root
,
6338 path
->nodes
[level
]->start
,
6339 path
->nodes
[level
]->len
,
6343 BUG_ON(wc
->refs
[level
] == 0);
6345 if (level
== root_item
->drop_level
)
6348 btrfs_tree_unlock(path
->nodes
[level
]);
6349 WARN_ON(wc
->refs
[level
] != 1);
6355 wc
->shared_level
= -1;
6356 wc
->stage
= DROP_REFERENCE
;
6357 wc
->update_ref
= update_ref
;
6359 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(root
);
6362 ret
= walk_down_tree(trans
, root
, path
, wc
);
6368 ret
= walk_up_tree(trans
, root
, path
, wc
, BTRFS_MAX_LEVEL
);
6375 BUG_ON(wc
->stage
!= DROP_REFERENCE
);
6379 if (wc
->stage
== DROP_REFERENCE
) {
6381 btrfs_node_key(path
->nodes
[level
],
6382 &root_item
->drop_progress
,
6383 path
->slots
[level
]);
6384 root_item
->drop_level
= level
;
6387 BUG_ON(wc
->level
== 0);
6388 if (btrfs_should_end_transaction(trans
, tree_root
)) {
6389 ret
= btrfs_update_root(trans
, tree_root
,
6394 btrfs_end_transaction_throttle(trans
, tree_root
);
6395 trans
= btrfs_start_transaction(tree_root
, 0);
6396 BUG_ON(IS_ERR(trans
));
6398 trans
->block_rsv
= block_rsv
;
6401 btrfs_release_path(root
, path
);
6404 ret
= btrfs_del_root(trans
, tree_root
, &root
->root_key
);
6407 if (root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
) {
6408 ret
= btrfs_find_last_root(tree_root
, root
->root_key
.objectid
,
6412 /* if we fail to delete the orphan item this time
6413 * around, it'll get picked up the next time.
6415 * The most common failure here is just -ENOENT.
6417 btrfs_del_orphan_item(trans
, tree_root
,
6418 root
->root_key
.objectid
);
6422 if (root
->in_radix
) {
6423 btrfs_free_fs_root(tree_root
->fs_info
, root
);
6425 free_extent_buffer(root
->node
);
6426 free_extent_buffer(root
->commit_root
);
6430 btrfs_end_transaction_throttle(trans
, tree_root
);
6432 btrfs_free_path(path
);
6437 * drop subtree rooted at tree block 'node'.
6439 * NOTE: this function will unlock and release tree block 'node'
6441 int btrfs_drop_subtree(struct btrfs_trans_handle
*trans
,
6442 struct btrfs_root
*root
,
6443 struct extent_buffer
*node
,
6444 struct extent_buffer
*parent
)
6446 struct btrfs_path
*path
;
6447 struct walk_control
*wc
;
6453 BUG_ON(root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
);
6455 path
= btrfs_alloc_path();
6458 wc
= kzalloc(sizeof(*wc
), GFP_NOFS
);
6461 btrfs_assert_tree_locked(parent
);
6462 parent_level
= btrfs_header_level(parent
);
6463 extent_buffer_get(parent
);
6464 path
->nodes
[parent_level
] = parent
;
6465 path
->slots
[parent_level
] = btrfs_header_nritems(parent
);
6467 btrfs_assert_tree_locked(node
);
6468 level
= btrfs_header_level(node
);
6469 path
->nodes
[level
] = node
;
6470 path
->slots
[level
] = 0;
6471 path
->locks
[level
] = 1;
6473 wc
->refs
[parent_level
] = 1;
6474 wc
->flags
[parent_level
] = BTRFS_BLOCK_FLAG_FULL_BACKREF
;
6476 wc
->shared_level
= -1;
6477 wc
->stage
= DROP_REFERENCE
;
6480 wc
->reada_count
= BTRFS_NODEPTRS_PER_BLOCK(root
);
6483 wret
= walk_down_tree(trans
, root
, path
, wc
);
6489 wret
= walk_up_tree(trans
, root
, path
, wc
, parent_level
);
6497 btrfs_free_path(path
);
6502 static unsigned long calc_ra(unsigned long start
, unsigned long last
,
6505 return min(last
, start
+ nr
- 1);
6508 static noinline
int relocate_inode_pages(struct inode
*inode
, u64 start
,
6513 unsigned long first_index
;
6514 unsigned long last_index
;
6517 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
6518 struct file_ra_state
*ra
;
6519 struct btrfs_ordered_extent
*ordered
;
6520 unsigned int total_read
= 0;
6521 unsigned int total_dirty
= 0;
6524 ra
= kzalloc(sizeof(*ra
), GFP_NOFS
);
6528 mutex_lock(&inode
->i_mutex
);
6529 first_index
= start
>> PAGE_CACHE_SHIFT
;
6530 last_index
= (start
+ len
- 1) >> PAGE_CACHE_SHIFT
;
6532 /* make sure the dirty trick played by the caller work */
6533 ret
= invalidate_inode_pages2_range(inode
->i_mapping
,
6534 first_index
, last_index
);
6538 file_ra_state_init(ra
, inode
->i_mapping
);
6540 for (i
= first_index
; i
<= last_index
; i
++) {
6541 if (total_read
% ra
->ra_pages
== 0) {
6542 btrfs_force_ra(inode
->i_mapping
, ra
, NULL
, i
,
6543 calc_ra(i
, last_index
, ra
->ra_pages
));
6547 if (((u64
)i
<< PAGE_CACHE_SHIFT
) > i_size_read(inode
))
6549 page
= grab_cache_page(inode
->i_mapping
, i
);
6554 if (!PageUptodate(page
)) {
6555 btrfs_readpage(NULL
, page
);
6557 if (!PageUptodate(page
)) {
6559 page_cache_release(page
);
6564 wait_on_page_writeback(page
);
6566 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
6567 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
6568 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
6570 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
6572 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
6574 page_cache_release(page
);
6575 btrfs_start_ordered_extent(inode
, ordered
, 1);
6576 btrfs_put_ordered_extent(ordered
);
6579 set_page_extent_mapped(page
);
6581 if (i
== first_index
)
6582 set_extent_bits(io_tree
, page_start
, page_end
,
6583 EXTENT_BOUNDARY
, GFP_NOFS
);
6584 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
6586 set_page_dirty(page
);
6589 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
6591 page_cache_release(page
);
6596 mutex_unlock(&inode
->i_mutex
);
6597 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, total_dirty
);
6601 static noinline
int relocate_data_extent(struct inode
*reloc_inode
,
6602 struct btrfs_key
*extent_key
,
6605 struct btrfs_root
*root
= BTRFS_I(reloc_inode
)->root
;
6606 struct extent_map_tree
*em_tree
= &BTRFS_I(reloc_inode
)->extent_tree
;
6607 struct extent_map
*em
;
6608 u64 start
= extent_key
->objectid
- offset
;
6609 u64 end
= start
+ extent_key
->offset
- 1;
6611 em
= alloc_extent_map(GFP_NOFS
);
6615 em
->len
= extent_key
->offset
;
6616 em
->block_len
= extent_key
->offset
;
6617 em
->block_start
= extent_key
->objectid
;
6618 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
6619 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
6621 /* setup extent map to cheat btrfs_readpage */
6622 lock_extent(&BTRFS_I(reloc_inode
)->io_tree
, start
, end
, GFP_NOFS
);
6625 write_lock(&em_tree
->lock
);
6626 ret
= add_extent_mapping(em_tree
, em
);
6627 write_unlock(&em_tree
->lock
);
6628 if (ret
!= -EEXIST
) {
6629 free_extent_map(em
);
6632 btrfs_drop_extent_cache(reloc_inode
, start
, end
, 0);
6634 unlock_extent(&BTRFS_I(reloc_inode
)->io_tree
, start
, end
, GFP_NOFS
);
6636 return relocate_inode_pages(reloc_inode
, start
, extent_key
->offset
);
6639 struct btrfs_ref_path
{
6641 u64 nodes
[BTRFS_MAX_LEVEL
];
6643 u64 root_generation
;
6650 struct btrfs_key node_keys
[BTRFS_MAX_LEVEL
];
6651 u64 new_nodes
[BTRFS_MAX_LEVEL
];
6654 struct disk_extent
{
6665 static int is_cowonly_root(u64 root_objectid
)
6667 if (root_objectid
== BTRFS_ROOT_TREE_OBJECTID
||
6668 root_objectid
== BTRFS_EXTENT_TREE_OBJECTID
||
6669 root_objectid
== BTRFS_CHUNK_TREE_OBJECTID
||
6670 root_objectid
== BTRFS_DEV_TREE_OBJECTID
||
6671 root_objectid
== BTRFS_TREE_LOG_OBJECTID
||
6672 root_objectid
== BTRFS_CSUM_TREE_OBJECTID
)
6677 static noinline
int __next_ref_path(struct btrfs_trans_handle
*trans
,
6678 struct btrfs_root
*extent_root
,
6679 struct btrfs_ref_path
*ref_path
,
6682 struct extent_buffer
*leaf
;
6683 struct btrfs_path
*path
;
6684 struct btrfs_extent_ref
*ref
;
6685 struct btrfs_key key
;
6686 struct btrfs_key found_key
;
6692 path
= btrfs_alloc_path();
6697 ref_path
->lowest_level
= -1;
6698 ref_path
->current_level
= -1;
6699 ref_path
->shared_level
= -1;
6703 level
= ref_path
->current_level
- 1;
6704 while (level
>= -1) {
6706 if (level
< ref_path
->lowest_level
)
6710 bytenr
= ref_path
->nodes
[level
];
6712 bytenr
= ref_path
->extent_start
;
6713 BUG_ON(bytenr
== 0);
6715 parent
= ref_path
->nodes
[level
+ 1];
6716 ref_path
->nodes
[level
+ 1] = 0;
6717 ref_path
->current_level
= level
;
6718 BUG_ON(parent
== 0);
6720 key
.objectid
= bytenr
;
6721 key
.offset
= parent
+ 1;
6722 key
.type
= BTRFS_EXTENT_REF_KEY
;
6724 ret
= btrfs_search_slot(trans
, extent_root
, &key
, path
, 0, 0);
6729 leaf
= path
->nodes
[0];
6730 nritems
= btrfs_header_nritems(leaf
);
6731 if (path
->slots
[0] >= nritems
) {
6732 ret
= btrfs_next_leaf(extent_root
, path
);
6737 leaf
= path
->nodes
[0];
6740 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6741 if (found_key
.objectid
== bytenr
&&
6742 found_key
.type
== BTRFS_EXTENT_REF_KEY
) {
6743 if (level
< ref_path
->shared_level
)
6744 ref_path
->shared_level
= level
;
6749 btrfs_release_path(extent_root
, path
);
6752 /* reached lowest level */
6756 level
= ref_path
->current_level
;
6757 while (level
< BTRFS_MAX_LEVEL
- 1) {
6761 bytenr
= ref_path
->nodes
[level
];
6763 bytenr
= ref_path
->extent_start
;
6765 BUG_ON(bytenr
== 0);
6767 key
.objectid
= bytenr
;
6769 key
.type
= BTRFS_EXTENT_REF_KEY
;
6771 ret
= btrfs_search_slot(trans
, extent_root
, &key
, path
, 0, 0);
6775 leaf
= path
->nodes
[0];
6776 nritems
= btrfs_header_nritems(leaf
);
6777 if (path
->slots
[0] >= nritems
) {
6778 ret
= btrfs_next_leaf(extent_root
, path
);
6782 /* the extent was freed by someone */
6783 if (ref_path
->lowest_level
== level
)
6785 btrfs_release_path(extent_root
, path
);
6788 leaf
= path
->nodes
[0];
6791 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6792 if (found_key
.objectid
!= bytenr
||
6793 found_key
.type
!= BTRFS_EXTENT_REF_KEY
) {
6794 /* the extent was freed by someone */
6795 if (ref_path
->lowest_level
== level
) {
6799 btrfs_release_path(extent_root
, path
);
6803 ref
= btrfs_item_ptr(leaf
, path
->slots
[0],
6804 struct btrfs_extent_ref
);
6805 ref_objectid
= btrfs_ref_objectid(leaf
, ref
);
6806 if (ref_objectid
< BTRFS_FIRST_FREE_OBJECTID
) {
6808 level
= (int)ref_objectid
;
6809 BUG_ON(level
>= BTRFS_MAX_LEVEL
);
6810 ref_path
->lowest_level
= level
;
6811 ref_path
->current_level
= level
;
6812 ref_path
->nodes
[level
] = bytenr
;
6814 WARN_ON(ref_objectid
!= level
);
6817 WARN_ON(level
!= -1);
6821 if (ref_path
->lowest_level
== level
) {
6822 ref_path
->owner_objectid
= ref_objectid
;
6823 ref_path
->num_refs
= btrfs_ref_num_refs(leaf
, ref
);
6827 * the block is tree root or the block isn't in reference
6830 if (found_key
.objectid
== found_key
.offset
||
6831 is_cowonly_root(btrfs_ref_root(leaf
, ref
))) {
6832 ref_path
->root_objectid
= btrfs_ref_root(leaf
, ref
);
6833 ref_path
->root_generation
=
6834 btrfs_ref_generation(leaf
, ref
);
6836 /* special reference from the tree log */
6837 ref_path
->nodes
[0] = found_key
.offset
;
6838 ref_path
->current_level
= 0;
6845 BUG_ON(ref_path
->nodes
[level
] != 0);
6846 ref_path
->nodes
[level
] = found_key
.offset
;
6847 ref_path
->current_level
= level
;
6850 * the reference was created in the running transaction,
6851 * no need to continue walking up.
6853 if (btrfs_ref_generation(leaf
, ref
) == trans
->transid
) {
6854 ref_path
->root_objectid
= btrfs_ref_root(leaf
, ref
);
6855 ref_path
->root_generation
=
6856 btrfs_ref_generation(leaf
, ref
);
6861 btrfs_release_path(extent_root
, path
);
6864 /* reached max tree level, but no tree root found. */
6867 btrfs_free_path(path
);
6871 static int btrfs_first_ref_path(struct btrfs_trans_handle
*trans
,
6872 struct btrfs_root
*extent_root
,
6873 struct btrfs_ref_path
*ref_path
,
6876 memset(ref_path
, 0, sizeof(*ref_path
));
6877 ref_path
->extent_start
= extent_start
;
6879 return __next_ref_path(trans
, extent_root
, ref_path
, 1);
6882 static int btrfs_next_ref_path(struct btrfs_trans_handle
*trans
,
6883 struct btrfs_root
*extent_root
,
6884 struct btrfs_ref_path
*ref_path
)
6886 return __next_ref_path(trans
, extent_root
, ref_path
, 0);
6889 static noinline
int get_new_locations(struct inode
*reloc_inode
,
6890 struct btrfs_key
*extent_key
,
6891 u64 offset
, int no_fragment
,
6892 struct disk_extent
**extents
,
6895 struct btrfs_root
*root
= BTRFS_I(reloc_inode
)->root
;
6896 struct btrfs_path
*path
;
6897 struct btrfs_file_extent_item
*fi
;
6898 struct extent_buffer
*leaf
;
6899 struct disk_extent
*exts
= *extents
;
6900 struct btrfs_key found_key
;
6905 int max
= *nr_extents
;
6908 WARN_ON(!no_fragment
&& *extents
);
6911 exts
= kmalloc(sizeof(*exts
) * max
, GFP_NOFS
);
6916 path
= btrfs_alloc_path();
6919 cur_pos
= extent_key
->objectid
- offset
;
6920 last_byte
= extent_key
->objectid
+ extent_key
->offset
;
6921 ret
= btrfs_lookup_file_extent(NULL
, root
, path
, reloc_inode
->i_ino
,
6931 leaf
= path
->nodes
[0];
6932 nritems
= btrfs_header_nritems(leaf
);
6933 if (path
->slots
[0] >= nritems
) {
6934 ret
= btrfs_next_leaf(root
, path
);
6939 leaf
= path
->nodes
[0];
6942 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6943 if (found_key
.offset
!= cur_pos
||
6944 found_key
.type
!= BTRFS_EXTENT_DATA_KEY
||
6945 found_key
.objectid
!= reloc_inode
->i_ino
)
6948 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
6949 struct btrfs_file_extent_item
);
6950 if (btrfs_file_extent_type(leaf
, fi
) !=
6951 BTRFS_FILE_EXTENT_REG
||
6952 btrfs_file_extent_disk_bytenr(leaf
, fi
) == 0)
6956 struct disk_extent
*old
= exts
;
6958 exts
= kzalloc(sizeof(*exts
) * max
, GFP_NOFS
);
6959 memcpy(exts
, old
, sizeof(*exts
) * nr
);
6960 if (old
!= *extents
)
6964 exts
[nr
].disk_bytenr
=
6965 btrfs_file_extent_disk_bytenr(leaf
, fi
);
6966 exts
[nr
].disk_num_bytes
=
6967 btrfs_file_extent_disk_num_bytes(leaf
, fi
);
6968 exts
[nr
].offset
= btrfs_file_extent_offset(leaf
, fi
);
6969 exts
[nr
].num_bytes
= btrfs_file_extent_num_bytes(leaf
, fi
);
6970 exts
[nr
].ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, fi
);
6971 exts
[nr
].compression
= btrfs_file_extent_compression(leaf
, fi
);
6972 exts
[nr
].encryption
= btrfs_file_extent_encryption(leaf
, fi
);
6973 exts
[nr
].other_encoding
= btrfs_file_extent_other_encoding(leaf
,
6975 BUG_ON(exts
[nr
].offset
> 0);
6976 BUG_ON(exts
[nr
].compression
|| exts
[nr
].encryption
);
6977 BUG_ON(exts
[nr
].num_bytes
!= exts
[nr
].disk_num_bytes
);
6979 cur_pos
+= exts
[nr
].num_bytes
;
6982 if (cur_pos
+ offset
>= last_byte
)
6992 BUG_ON(cur_pos
+ offset
> last_byte
);
6993 if (cur_pos
+ offset
< last_byte
) {
6999 btrfs_free_path(path
);
7001 if (exts
!= *extents
)
7010 static noinline
int replace_one_extent(struct btrfs_trans_handle
*trans
,
7011 struct btrfs_root
*root
,
7012 struct btrfs_path
*path
,
7013 struct btrfs_key
*extent_key
,
7014 struct btrfs_key
*leaf_key
,
7015 struct btrfs_ref_path
*ref_path
,
7016 struct disk_extent
*new_extents
,
7019 struct extent_buffer
*leaf
;
7020 struct btrfs_file_extent_item
*fi
;
7021 struct inode
*inode
= NULL
;
7022 struct btrfs_key key
;
7027 u64 search_end
= (u64
)-1;
7030 int extent_locked
= 0;
7034 memcpy(&key
, leaf_key
, sizeof(key
));
7035 if (ref_path
->owner_objectid
!= BTRFS_MULTIPLE_OBJECTIDS
) {
7036 if (key
.objectid
< ref_path
->owner_objectid
||
7037 (key
.objectid
== ref_path
->owner_objectid
&&
7038 key
.type
< BTRFS_EXTENT_DATA_KEY
)) {
7039 key
.objectid
= ref_path
->owner_objectid
;
7040 key
.type
= BTRFS_EXTENT_DATA_KEY
;
7046 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
7050 leaf
= path
->nodes
[0];
7051 nritems
= btrfs_header_nritems(leaf
);
7053 if (extent_locked
&& ret
> 0) {
7055 * the file extent item was modified by someone
7056 * before the extent got locked.
7058 unlock_extent(&BTRFS_I(inode
)->io_tree
, lock_start
,
7059 lock_end
, GFP_NOFS
);
7063 if (path
->slots
[0] >= nritems
) {
7064 if (++nr_scaned
> 2)
7067 BUG_ON(extent_locked
);
7068 ret
= btrfs_next_leaf(root
, path
);
7073 leaf
= path
->nodes
[0];
7074 nritems
= btrfs_header_nritems(leaf
);
7077 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
7079 if (ref_path
->owner_objectid
!= BTRFS_MULTIPLE_OBJECTIDS
) {
7080 if ((key
.objectid
> ref_path
->owner_objectid
) ||
7081 (key
.objectid
== ref_path
->owner_objectid
&&
7082 key
.type
> BTRFS_EXTENT_DATA_KEY
) ||
7083 key
.offset
>= search_end
)
7087 if (inode
&& key
.objectid
!= inode
->i_ino
) {
7088 BUG_ON(extent_locked
);
7089 btrfs_release_path(root
, path
);
7090 mutex_unlock(&inode
->i_mutex
);
7096 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
) {
7101 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
7102 struct btrfs_file_extent_item
);
7103 extent_type
= btrfs_file_extent_type(leaf
, fi
);
7104 if ((extent_type
!= BTRFS_FILE_EXTENT_REG
&&
7105 extent_type
!= BTRFS_FILE_EXTENT_PREALLOC
) ||
7106 (btrfs_file_extent_disk_bytenr(leaf
, fi
) !=
7107 extent_key
->objectid
)) {
7113 num_bytes
= btrfs_file_extent_num_bytes(leaf
, fi
);
7114 ext_offset
= btrfs_file_extent_offset(leaf
, fi
);
7116 if (search_end
== (u64
)-1) {
7117 search_end
= key
.offset
- ext_offset
+
7118 btrfs_file_extent_ram_bytes(leaf
, fi
);
7121 if (!extent_locked
) {
7122 lock_start
= key
.offset
;
7123 lock_end
= lock_start
+ num_bytes
- 1;
7125 if (lock_start
> key
.offset
||
7126 lock_end
+ 1 < key
.offset
+ num_bytes
) {
7127 unlock_extent(&BTRFS_I(inode
)->io_tree
,
7128 lock_start
, lock_end
, GFP_NOFS
);
7134 btrfs_release_path(root
, path
);
7136 inode
= btrfs_iget_locked(root
->fs_info
->sb
,
7137 key
.objectid
, root
);
7138 if (inode
->i_state
& I_NEW
) {
7139 BTRFS_I(inode
)->root
= root
;
7140 BTRFS_I(inode
)->location
.objectid
=
7142 BTRFS_I(inode
)->location
.type
=
7143 BTRFS_INODE_ITEM_KEY
;
7144 BTRFS_I(inode
)->location
.offset
= 0;
7145 btrfs_read_locked_inode(inode
);
7146 unlock_new_inode(inode
);
7149 * some code call btrfs_commit_transaction while
7150 * holding the i_mutex, so we can't use mutex_lock
7153 if (is_bad_inode(inode
) ||
7154 !mutex_trylock(&inode
->i_mutex
)) {
7157 key
.offset
= (u64
)-1;
7162 if (!extent_locked
) {
7163 struct btrfs_ordered_extent
*ordered
;
7165 btrfs_release_path(root
, path
);
7167 lock_extent(&BTRFS_I(inode
)->io_tree
, lock_start
,
7168 lock_end
, GFP_NOFS
);
7169 ordered
= btrfs_lookup_first_ordered_extent(inode
,
7172 ordered
->file_offset
<= lock_end
&&
7173 ordered
->file_offset
+ ordered
->len
> lock_start
) {
7174 unlock_extent(&BTRFS_I(inode
)->io_tree
,
7175 lock_start
, lock_end
, GFP_NOFS
);
7176 btrfs_start_ordered_extent(inode
, ordered
, 1);
7177 btrfs_put_ordered_extent(ordered
);
7178 key
.offset
+= num_bytes
;
7182 btrfs_put_ordered_extent(ordered
);
7188 if (nr_extents
== 1) {
7189 /* update extent pointer in place */
7190 btrfs_set_file_extent_disk_bytenr(leaf
, fi
,
7191 new_extents
[0].disk_bytenr
);
7192 btrfs_set_file_extent_disk_num_bytes(leaf
, fi
,
7193 new_extents
[0].disk_num_bytes
);
7194 btrfs_mark_buffer_dirty(leaf
);
7196 btrfs_drop_extent_cache(inode
, key
.offset
,
7197 key
.offset
+ num_bytes
- 1, 0);
7199 ret
= btrfs_inc_extent_ref(trans
, root
,
7200 new_extents
[0].disk_bytenr
,
7201 new_extents
[0].disk_num_bytes
,
7203 root
->root_key
.objectid
,
7208 ret
= btrfs_free_extent(trans
, root
,
7209 extent_key
->objectid
,
7212 btrfs_header_owner(leaf
),
7213 btrfs_header_generation(leaf
),
7217 btrfs_release_path(root
, path
);
7218 key
.offset
+= num_bytes
;
7226 * drop old extent pointer at first, then insert the
7227 * new pointers one bye one
7229 btrfs_release_path(root
, path
);
7230 ret
= btrfs_drop_extents(trans
, root
, inode
, key
.offset
,
7231 key
.offset
+ num_bytes
,
7232 key
.offset
, &alloc_hint
);
7235 for (i
= 0; i
< nr_extents
; i
++) {
7236 if (ext_offset
>= new_extents
[i
].num_bytes
) {
7237 ext_offset
-= new_extents
[i
].num_bytes
;
7240 extent_len
= min(new_extents
[i
].num_bytes
-
7241 ext_offset
, num_bytes
);
7243 ret
= btrfs_insert_empty_item(trans
, root
,
7248 leaf
= path
->nodes
[0];
7249 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
7250 struct btrfs_file_extent_item
);
7251 btrfs_set_file_extent_generation(leaf
, fi
,
7253 btrfs_set_file_extent_type(leaf
, fi
,
7254 BTRFS_FILE_EXTENT_REG
);
7255 btrfs_set_file_extent_disk_bytenr(leaf
, fi
,
7256 new_extents
[i
].disk_bytenr
);
7257 btrfs_set_file_extent_disk_num_bytes(leaf
, fi
,
7258 new_extents
[i
].disk_num_bytes
);
7259 btrfs_set_file_extent_ram_bytes(leaf
, fi
,
7260 new_extents
[i
].ram_bytes
);
7262 btrfs_set_file_extent_compression(leaf
, fi
,
7263 new_extents
[i
].compression
);
7264 btrfs_set_file_extent_encryption(leaf
, fi
,
7265 new_extents
[i
].encryption
);
7266 btrfs_set_file_extent_other_encoding(leaf
, fi
,
7267 new_extents
[i
].other_encoding
);
7269 btrfs_set_file_extent_num_bytes(leaf
, fi
,
7271 ext_offset
+= new_extents
[i
].offset
;
7272 btrfs_set_file_extent_offset(leaf
, fi
,
7274 btrfs_mark_buffer_dirty(leaf
);
7276 btrfs_drop_extent_cache(inode
, key
.offset
,
7277 key
.offset
+ extent_len
- 1, 0);
7279 ret
= btrfs_inc_extent_ref(trans
, root
,
7280 new_extents
[i
].disk_bytenr
,
7281 new_extents
[i
].disk_num_bytes
,
7283 root
->root_key
.objectid
,
7284 trans
->transid
, key
.objectid
);
7286 btrfs_release_path(root
, path
);
7288 inode_add_bytes(inode
, extent_len
);
7291 num_bytes
-= extent_len
;
7292 key
.offset
+= extent_len
;
7297 BUG_ON(i
>= nr_extents
);
7301 if (extent_locked
) {
7302 unlock_extent(&BTRFS_I(inode
)->io_tree
, lock_start
,
7303 lock_end
, GFP_NOFS
);
7307 if (ref_path
->owner_objectid
!= BTRFS_MULTIPLE_OBJECTIDS
&&
7308 key
.offset
>= search_end
)
7315 btrfs_release_path(root
, path
);
7317 mutex_unlock(&inode
->i_mutex
);
7318 if (extent_locked
) {
7319 unlock_extent(&BTRFS_I(inode
)->io_tree
, lock_start
,
7320 lock_end
, GFP_NOFS
);
7327 int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle
*trans
,
7328 struct btrfs_root
*root
,
7329 struct extent_buffer
*buf
, u64 orig_start
)
7334 BUG_ON(btrfs_header_generation(buf
) != trans
->transid
);
7335 BUG_ON(root
->root_key
.objectid
!= BTRFS_TREE_RELOC_OBJECTID
);
7337 level
= btrfs_header_level(buf
);
7339 struct btrfs_leaf_ref
*ref
;
7340 struct btrfs_leaf_ref
*orig_ref
;
7342 orig_ref
= btrfs_lookup_leaf_ref(root
, orig_start
);
7346 ref
= btrfs_alloc_leaf_ref(root
, orig_ref
->nritems
);
7348 btrfs_free_leaf_ref(root
, orig_ref
);
7352 ref
->nritems
= orig_ref
->nritems
;
7353 memcpy(ref
->extents
, orig_ref
->extents
,
7354 sizeof(ref
->extents
[0]) * ref
->nritems
);
7356 btrfs_free_leaf_ref(root
, orig_ref
);
7358 ref
->root_gen
= trans
->transid
;
7359 ref
->bytenr
= buf
->start
;
7360 ref
->owner
= btrfs_header_owner(buf
);
7361 ref
->generation
= btrfs_header_generation(buf
);
7363 ret
= btrfs_add_leaf_ref(root
, ref
, 0);
7365 btrfs_free_leaf_ref(root
, ref
);
7370 static noinline
int invalidate_extent_cache(struct btrfs_root
*root
,
7371 struct extent_buffer
*leaf
,
7372 struct btrfs_block_group_cache
*group
,
7373 struct btrfs_root
*target_root
)
7375 struct btrfs_key key
;
7376 struct inode
*inode
= NULL
;
7377 struct btrfs_file_extent_item
*fi
;
7378 struct extent_state
*cached_state
= NULL
;
7380 u64 skip_objectid
= 0;
7384 nritems
= btrfs_header_nritems(leaf
);
7385 for (i
= 0; i
< nritems
; i
++) {
7386 btrfs_item_key_to_cpu(leaf
, &key
, i
);
7387 if (key
.objectid
== skip_objectid
||
7388 key
.type
!= BTRFS_EXTENT_DATA_KEY
)
7390 fi
= btrfs_item_ptr(leaf
, i
, struct btrfs_file_extent_item
);
7391 if (btrfs_file_extent_type(leaf
, fi
) ==
7392 BTRFS_FILE_EXTENT_INLINE
)
7394 if (btrfs_file_extent_disk_bytenr(leaf
, fi
) == 0)
7396 if (!inode
|| inode
->i_ino
!= key
.objectid
) {
7398 inode
= btrfs_ilookup(target_root
->fs_info
->sb
,
7399 key
.objectid
, target_root
, 1);
7402 skip_objectid
= key
.objectid
;
7405 num_bytes
= btrfs_file_extent_num_bytes(leaf
, fi
);
7407 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, key
.offset
,
7408 key
.offset
+ num_bytes
- 1, 0, &cached_state
,
7410 btrfs_drop_extent_cache(inode
, key
.offset
,
7411 key
.offset
+ num_bytes
- 1, 1);
7412 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, key
.offset
,
7413 key
.offset
+ num_bytes
- 1, &cached_state
,
7421 static noinline
int replace_extents_in_leaf(struct btrfs_trans_handle
*trans
,
7422 struct btrfs_root
*root
,
7423 struct extent_buffer
*leaf
,
7424 struct btrfs_block_group_cache
*group
,
7425 struct inode
*reloc_inode
)
7427 struct btrfs_key key
;
7428 struct btrfs_key extent_key
;
7429 struct btrfs_file_extent_item
*fi
;
7430 struct btrfs_leaf_ref
*ref
;
7431 struct disk_extent
*new_extent
;
7440 new_extent
= kmalloc(sizeof(*new_extent
), GFP_NOFS
);
7441 BUG_ON(!new_extent
);
7443 ref
= btrfs_lookup_leaf_ref(root
, leaf
->start
);
7447 nritems
= btrfs_header_nritems(leaf
);
7448 for (i
= 0; i
< nritems
; i
++) {
7449 btrfs_item_key_to_cpu(leaf
, &key
, i
);
7450 if (btrfs_key_type(&key
) != BTRFS_EXTENT_DATA_KEY
)
7452 fi
= btrfs_item_ptr(leaf
, i
, struct btrfs_file_extent_item
);
7453 if (btrfs_file_extent_type(leaf
, fi
) ==
7454 BTRFS_FILE_EXTENT_INLINE
)
7456 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
7457 num_bytes
= btrfs_file_extent_disk_num_bytes(leaf
, fi
);
7462 if (bytenr
>= group
->key
.objectid
+ group
->key
.offset
||
7463 bytenr
+ num_bytes
<= group
->key
.objectid
)
7466 extent_key
.objectid
= bytenr
;
7467 extent_key
.offset
= num_bytes
;
7468 extent_key
.type
= BTRFS_EXTENT_ITEM_KEY
;
7470 ret
= get_new_locations(reloc_inode
, &extent_key
,
7471 group
->key
.objectid
, 1,
7472 &new_extent
, &nr_extent
);
7477 BUG_ON(ref
->extents
[ext_index
].bytenr
!= bytenr
);
7478 BUG_ON(ref
->extents
[ext_index
].num_bytes
!= num_bytes
);
7479 ref
->extents
[ext_index
].bytenr
= new_extent
->disk_bytenr
;
7480 ref
->extents
[ext_index
].num_bytes
= new_extent
->disk_num_bytes
;
7482 btrfs_set_file_extent_disk_bytenr(leaf
, fi
,
7483 new_extent
->disk_bytenr
);
7484 btrfs_set_file_extent_disk_num_bytes(leaf
, fi
,
7485 new_extent
->disk_num_bytes
);
7486 btrfs_mark_buffer_dirty(leaf
);
7488 ret
= btrfs_inc_extent_ref(trans
, root
,
7489 new_extent
->disk_bytenr
,
7490 new_extent
->disk_num_bytes
,
7492 root
->root_key
.objectid
,
7493 trans
->transid
, key
.objectid
);
7496 ret
= btrfs_free_extent(trans
, root
,
7497 bytenr
, num_bytes
, leaf
->start
,
7498 btrfs_header_owner(leaf
),
7499 btrfs_header_generation(leaf
),
7505 BUG_ON(ext_index
+ 1 != ref
->nritems
);
7506 btrfs_free_leaf_ref(root
, ref
);
7510 int btrfs_free_reloc_root(struct btrfs_trans_handle
*trans
,
7511 struct btrfs_root
*root
)
7513 struct btrfs_root
*reloc_root
;
7516 if (root
->reloc_root
) {
7517 reloc_root
= root
->reloc_root
;
7518 root
->reloc_root
= NULL
;
7519 list_add(&reloc_root
->dead_list
,
7520 &root
->fs_info
->dead_reloc_roots
);
7522 btrfs_set_root_bytenr(&reloc_root
->root_item
,
7523 reloc_root
->node
->start
);
7524 btrfs_set_root_level(&root
->root_item
,
7525 btrfs_header_level(reloc_root
->node
));
7526 memset(&reloc_root
->root_item
.drop_progress
, 0,
7527 sizeof(struct btrfs_disk_key
));
7528 reloc_root
->root_item
.drop_level
= 0;
7530 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
7531 &reloc_root
->root_key
,
7532 &reloc_root
->root_item
);
7538 int btrfs_drop_dead_reloc_roots(struct btrfs_root
*root
)
7540 struct btrfs_trans_handle
*trans
;
7541 struct btrfs_root
*reloc_root
;
7542 struct btrfs_root
*prev_root
= NULL
;
7543 struct list_head dead_roots
;
7547 INIT_LIST_HEAD(&dead_roots
);
7548 list_splice_init(&root
->fs_info
->dead_reloc_roots
, &dead_roots
);
7550 while (!list_empty(&dead_roots
)) {
7551 reloc_root
= list_entry(dead_roots
.prev
,
7552 struct btrfs_root
, dead_list
);
7553 list_del_init(&reloc_root
->dead_list
);
7555 BUG_ON(reloc_root
->commit_root
!= NULL
);
7557 trans
= btrfs_join_transaction(root
, 1);
7558 BUG_ON(IS_ERR(trans
));
7560 mutex_lock(&root
->fs_info
->drop_mutex
);
7561 ret
= btrfs_drop_snapshot(trans
, reloc_root
);
7564 mutex_unlock(&root
->fs_info
->drop_mutex
);
7566 nr
= trans
->blocks_used
;
7567 ret
= btrfs_end_transaction(trans
, root
);
7569 btrfs_btree_balance_dirty(root
, nr
);
7572 free_extent_buffer(reloc_root
->node
);
7574 ret
= btrfs_del_root(trans
, root
->fs_info
->tree_root
,
7575 &reloc_root
->root_key
);
7577 mutex_unlock(&root
->fs_info
->drop_mutex
);
7579 nr
= trans
->blocks_used
;
7580 ret
= btrfs_end_transaction(trans
, root
);
7582 btrfs_btree_balance_dirty(root
, nr
);
7585 prev_root
= reloc_root
;
7588 btrfs_remove_leaf_refs(prev_root
, (u64
)-1, 0);
7594 int btrfs_add_dead_reloc_root(struct btrfs_root
*root
)
7596 list_add(&root
->dead_list
, &root
->fs_info
->dead_reloc_roots
);
7600 int btrfs_cleanup_reloc_trees(struct btrfs_root
*root
)
7602 struct btrfs_root
*reloc_root
;
7603 struct btrfs_trans_handle
*trans
;
7604 struct btrfs_key location
;
7608 mutex_lock(&root
->fs_info
->tree_reloc_mutex
);
7609 ret
= btrfs_find_dead_roots(root
, BTRFS_TREE_RELOC_OBJECTID
, NULL
);
7611 found
= !list_empty(&root
->fs_info
->dead_reloc_roots
);
7612 mutex_unlock(&root
->fs_info
->tree_reloc_mutex
);
7615 trans
= btrfs_start_transaction(root
, 1);
7616 BUG_ON(IS_ERR(trans
));
7617 ret
= btrfs_commit_transaction(trans
, root
);
7621 location
.objectid
= BTRFS_DATA_RELOC_TREE_OBJECTID
;
7622 location
.offset
= (u64
)-1;
7623 location
.type
= BTRFS_ROOT_ITEM_KEY
;
7625 reloc_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &location
);
7626 BUG_ON(!reloc_root
);
7627 ret
= btrfs_orphan_cleanup(reloc_root
);
7632 static noinline
int init_reloc_tree(struct btrfs_trans_handle
*trans
,
7633 struct btrfs_root
*root
)
7635 struct btrfs_root
*reloc_root
;
7636 struct extent_buffer
*eb
;
7637 struct btrfs_root_item
*root_item
;
7638 struct btrfs_key root_key
;
7641 BUG_ON(!root
->ref_cows
);
7642 if (root
->reloc_root
)
7645 root_item
= kmalloc(sizeof(*root_item
), GFP_NOFS
);
7648 ret
= btrfs_copy_root(trans
, root
, root
->commit_root
,
7649 &eb
, BTRFS_TREE_RELOC_OBJECTID
);
7652 root_key
.objectid
= BTRFS_TREE_RELOC_OBJECTID
;
7653 root_key
.offset
= root
->root_key
.objectid
;
7654 root_key
.type
= BTRFS_ROOT_ITEM_KEY
;
7656 memcpy(root_item
, &root
->root_item
, sizeof(root_item
));
7657 btrfs_set_root_refs(root_item
, 0);
7658 btrfs_set_root_bytenr(root_item
, eb
->start
);
7659 btrfs_set_root_level(root_item
, btrfs_header_level(eb
));
7660 btrfs_set_root_generation(root_item
, trans
->transid
);
7662 btrfs_tree_unlock(eb
);
7663 free_extent_buffer(eb
);
7665 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
,
7666 &root_key
, root_item
);
7670 reloc_root
= btrfs_read_fs_root_no_radix(root
->fs_info
->tree_root
,
7672 BUG_ON(!reloc_root
);
7673 reloc_root
->last_trans
= trans
->transid
;
7674 reloc_root
->commit_root
= NULL
;
7675 reloc_root
->ref_tree
= &root
->fs_info
->reloc_ref_tree
;
7677 root
->reloc_root
= reloc_root
;
7682 * Core function of space balance.
7684 * The idea is using reloc trees to relocate tree blocks in reference
7685 * counted roots. There is one reloc tree for each subvol, and all
7686 * reloc trees share same root key objectid. Reloc trees are snapshots
7687 * of the latest committed roots of subvols (root->commit_root).
7689 * To relocate a tree block referenced by a subvol, there are two steps.
7690 * COW the block through subvol's reloc tree, then update block pointer
7691 * in the subvol to point to the new block. Since all reloc trees share
7692 * same root key objectid, doing special handing for tree blocks owned
7693 * by them is easy. Once a tree block has been COWed in one reloc tree,
7694 * we can use the resulting new block directly when the same block is
7695 * required to COW again through other reloc trees. By this way, relocated
7696 * tree blocks are shared between reloc trees, so they are also shared
7699 static noinline
int relocate_one_path(struct btrfs_trans_handle
*trans
,
7700 struct btrfs_root
*root
,
7701 struct btrfs_path
*path
,
7702 struct btrfs_key
*first_key
,
7703 struct btrfs_ref_path
*ref_path
,
7704 struct btrfs_block_group_cache
*group
,
7705 struct inode
*reloc_inode
)
7707 struct btrfs_root
*reloc_root
;
7708 struct extent_buffer
*eb
= NULL
;
7709 struct btrfs_key
*keys
;
7713 int lowest_level
= 0;
7716 if (ref_path
->owner_objectid
< BTRFS_FIRST_FREE_OBJECTID
)
7717 lowest_level
= ref_path
->owner_objectid
;
7719 if (!root
->ref_cows
) {
7720 path
->lowest_level
= lowest_level
;
7721 ret
= btrfs_search_slot(trans
, root
, first_key
, path
, 0, 1);
7723 path
->lowest_level
= 0;
7724 btrfs_release_path(root
, path
);
7728 mutex_lock(&root
->fs_info
->tree_reloc_mutex
);
7729 ret
= init_reloc_tree(trans
, root
);
7731 reloc_root
= root
->reloc_root
;
7733 shared_level
= ref_path
->shared_level
;
7734 ref_path
->shared_level
= BTRFS_MAX_LEVEL
- 1;
7736 keys
= ref_path
->node_keys
;
7737 nodes
= ref_path
->new_nodes
;
7738 memset(&keys
[shared_level
+ 1], 0,
7739 sizeof(*keys
) * (BTRFS_MAX_LEVEL
- shared_level
- 1));
7740 memset(&nodes
[shared_level
+ 1], 0,
7741 sizeof(*nodes
) * (BTRFS_MAX_LEVEL
- shared_level
- 1));
7743 if (nodes
[lowest_level
] == 0) {
7744 path
->lowest_level
= lowest_level
;
7745 ret
= btrfs_search_slot(trans
, reloc_root
, first_key
, path
,
7748 for (level
= lowest_level
; level
< BTRFS_MAX_LEVEL
; level
++) {
7749 eb
= path
->nodes
[level
];
7750 if (!eb
|| eb
== reloc_root
->node
)
7752 nodes
[level
] = eb
->start
;
7754 btrfs_item_key_to_cpu(eb
, &keys
[level
], 0);
7756 btrfs_node_key_to_cpu(eb
, &keys
[level
], 0);
7759 ref_path
->owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
) {
7760 eb
= path
->nodes
[0];
7761 ret
= replace_extents_in_leaf(trans
, reloc_root
, eb
,
7762 group
, reloc_inode
);
7765 btrfs_release_path(reloc_root
, path
);
7767 ret
= btrfs_merge_path(trans
, reloc_root
, keys
, nodes
,
7773 * replace tree blocks in the fs tree with tree blocks in
7776 ret
= btrfs_merge_path(trans
, root
, keys
, nodes
, lowest_level
);
7779 if (ref_path
->owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
) {
7780 ret
= btrfs_search_slot(trans
, reloc_root
, first_key
, path
,
7783 extent_buffer_get(path
->nodes
[0]);
7784 eb
= path
->nodes
[0];
7785 btrfs_release_path(reloc_root
, path
);
7786 ret
= invalidate_extent_cache(reloc_root
, eb
, group
, root
);
7788 free_extent_buffer(eb
);
7791 mutex_unlock(&root
->fs_info
->tree_reloc_mutex
);
7792 path
->lowest_level
= 0;
7796 static noinline
int relocate_tree_block(struct btrfs_trans_handle
*trans
,
7797 struct btrfs_root
*root
,
7798 struct btrfs_path
*path
,
7799 struct btrfs_key
*first_key
,
7800 struct btrfs_ref_path
*ref_path
)
7804 ret
= relocate_one_path(trans
, root
, path
, first_key
,
7805 ref_path
, NULL
, NULL
);
7811 static noinline
int del_extent_zero(struct btrfs_trans_handle
*trans
,
7812 struct btrfs_root
*extent_root
,
7813 struct btrfs_path
*path
,
7814 struct btrfs_key
*extent_key
)
7818 ret
= btrfs_search_slot(trans
, extent_root
, extent_key
, path
, -1, 1);
7821 ret
= btrfs_del_item(trans
, extent_root
, path
);
7823 btrfs_release_path(extent_root
, path
);
7827 static noinline
struct btrfs_root
*read_ref_root(struct btrfs_fs_info
*fs_info
,
7828 struct btrfs_ref_path
*ref_path
)
7830 struct btrfs_key root_key
;
7832 root_key
.objectid
= ref_path
->root_objectid
;
7833 root_key
.type
= BTRFS_ROOT_ITEM_KEY
;
7834 if (is_cowonly_root(ref_path
->root_objectid
))
7835 root_key
.offset
= 0;
7837 root_key
.offset
= (u64
)-1;
7839 return btrfs_read_fs_root_no_name(fs_info
, &root_key
);
7842 static noinline
int relocate_one_extent(struct btrfs_root
*extent_root
,
7843 struct btrfs_path
*path
,
7844 struct btrfs_key
*extent_key
,
7845 struct btrfs_block_group_cache
*group
,
7846 struct inode
*reloc_inode
, int pass
)
7848 struct btrfs_trans_handle
*trans
;
7849 struct btrfs_root
*found_root
;
7850 struct btrfs_ref_path
*ref_path
= NULL
;
7851 struct disk_extent
*new_extents
= NULL
;
7856 struct btrfs_key first_key
;
7860 trans
= btrfs_start_transaction(extent_root
, 1);
7861 BUG_ON(IS_ERR(trans
));
7863 if (extent_key
->objectid
== 0) {
7864 ret
= del_extent_zero(trans
, extent_root
, path
, extent_key
);
7868 ref_path
= kmalloc(sizeof(*ref_path
), GFP_NOFS
);
7874 for (loops
= 0; ; loops
++) {
7876 ret
= btrfs_first_ref_path(trans
, extent_root
, ref_path
,
7877 extent_key
->objectid
);
7879 ret
= btrfs_next_ref_path(trans
, extent_root
, ref_path
);
7886 if (ref_path
->root_objectid
== BTRFS_TREE_LOG_OBJECTID
||
7887 ref_path
->root_objectid
== BTRFS_TREE_RELOC_OBJECTID
)
7890 found_root
= read_ref_root(extent_root
->fs_info
, ref_path
);
7891 BUG_ON(!found_root
);
7893 * for reference counted tree, only process reference paths
7894 * rooted at the latest committed root.
7896 if (found_root
->ref_cows
&&
7897 ref_path
->root_generation
!= found_root
->root_key
.offset
)
7900 if (ref_path
->owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
) {
7903 * copy data extents to new locations
7905 u64 group_start
= group
->key
.objectid
;
7906 ret
= relocate_data_extent(reloc_inode
,
7915 level
= ref_path
->owner_objectid
;
7918 if (prev_block
!= ref_path
->nodes
[level
]) {
7919 struct extent_buffer
*eb
;
7920 u64 block_start
= ref_path
->nodes
[level
];
7921 u64 block_size
= btrfs_level_size(found_root
, level
);
7923 eb
= read_tree_block(found_root
, block_start
,
7925 btrfs_tree_lock(eb
);
7926 BUG_ON(level
!= btrfs_header_level(eb
));
7929 btrfs_item_key_to_cpu(eb
, &first_key
, 0);
7931 btrfs_node_key_to_cpu(eb
, &first_key
, 0);
7933 btrfs_tree_unlock(eb
);
7934 free_extent_buffer(eb
);
7935 prev_block
= block_start
;
7938 mutex_lock(&extent_root
->fs_info
->trans_mutex
);
7939 btrfs_record_root_in_trans(found_root
);
7940 mutex_unlock(&extent_root
->fs_info
->trans_mutex
);
7941 if (ref_path
->owner_objectid
>= BTRFS_FIRST_FREE_OBJECTID
) {
7943 * try to update data extent references while
7944 * keeping metadata shared between snapshots.
7947 ret
= relocate_one_path(trans
, found_root
,
7948 path
, &first_key
, ref_path
,
7949 group
, reloc_inode
);
7955 * use fallback method to process the remaining
7959 u64 group_start
= group
->key
.objectid
;
7960 new_extents
= kmalloc(sizeof(*new_extents
),
7963 ret
= get_new_locations(reloc_inode
,
7971 ret
= replace_one_extent(trans
, found_root
,
7973 &first_key
, ref_path
,
7974 new_extents
, nr_extents
);
7976 ret
= relocate_tree_block(trans
, found_root
, path
,
7977 &first_key
, ref_path
);
7984 btrfs_end_transaction(trans
, extent_root
);
7991 static u64
update_block_group_flags(struct btrfs_root
*root
, u64 flags
)
7994 u64 stripped
= BTRFS_BLOCK_GROUP_RAID0
|
7995 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID10
;
7998 * we add in the count of missing devices because we want
7999 * to make sure that any RAID levels on a degraded FS
8000 * continue to be honored.
8002 num_devices
= root
->fs_info
->fs_devices
->rw_devices
+
8003 root
->fs_info
->fs_devices
->missing_devices
;
8005 if (num_devices
== 1) {
8006 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
8007 stripped
= flags
& ~stripped
;
8009 /* turn raid0 into single device chunks */
8010 if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
8013 /* turn mirroring into duplication */
8014 if (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
8015 BTRFS_BLOCK_GROUP_RAID10
))
8016 return stripped
| BTRFS_BLOCK_GROUP_DUP
;
8019 /* they already had raid on here, just return */
8020 if (flags
& stripped
)
8023 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
8024 stripped
= flags
& ~stripped
;
8026 /* switch duplicated blocks with raid1 */
8027 if (flags
& BTRFS_BLOCK_GROUP_DUP
)
8028 return stripped
| BTRFS_BLOCK_GROUP_RAID1
;
8030 /* turn single device chunks into raid0 */
8031 return stripped
| BTRFS_BLOCK_GROUP_RAID0
;
8036 static int set_block_group_ro(struct btrfs_block_group_cache
*cache
)
8038 struct btrfs_space_info
*sinfo
= cache
->space_info
;
8045 spin_lock(&sinfo
->lock
);
8046 spin_lock(&cache
->lock
);
8047 num_bytes
= cache
->key
.offset
- cache
->reserved
- cache
->pinned
-
8048 cache
->bytes_super
- btrfs_block_group_used(&cache
->item
);
8050 if (sinfo
->bytes_used
+ sinfo
->bytes_reserved
+ sinfo
->bytes_pinned
+
8051 sinfo
->bytes_may_use
+ sinfo
->bytes_readonly
+
8052 cache
->reserved_pinned
+ num_bytes
<= sinfo
->total_bytes
) {
8053 sinfo
->bytes_readonly
+= num_bytes
;
8054 sinfo
->bytes_reserved
+= cache
->reserved_pinned
;
8055 cache
->reserved_pinned
= 0;
8060 spin_unlock(&cache
->lock
);
8061 spin_unlock(&sinfo
->lock
);
8065 int btrfs_set_block_group_ro(struct btrfs_root
*root
,
8066 struct btrfs_block_group_cache
*cache
)
8069 struct btrfs_trans_handle
*trans
;
8075 trans
= btrfs_join_transaction(root
, 1);
8076 BUG_ON(IS_ERR(trans
));
8078 alloc_flags
= update_block_group_flags(root
, cache
->flags
);
8079 if (alloc_flags
!= cache
->flags
)
8080 do_chunk_alloc(trans
, root
, 2 * 1024 * 1024, alloc_flags
, 1);
8082 ret
= set_block_group_ro(cache
);
8085 alloc_flags
= get_alloc_profile(root
, cache
->space_info
->flags
);
8086 ret
= do_chunk_alloc(trans
, root
, 2 * 1024 * 1024, alloc_flags
, 1);
8089 ret
= set_block_group_ro(cache
);
8091 btrfs_end_transaction(trans
, root
);
8095 int btrfs_force_chunk_alloc(struct btrfs_trans_handle
*trans
,
8096 struct btrfs_root
*root
, u64 type
)
8098 u64 alloc_flags
= get_alloc_profile(root
, type
);
8099 return do_chunk_alloc(trans
, root
, 2 * 1024 * 1024, alloc_flags
, 1);
8103 * helper to account the unused space of all the readonly block group in the
8104 * list. takes mirrors into account.
8106 static u64
__btrfs_get_ro_block_group_free_space(struct list_head
*groups_list
)
8108 struct btrfs_block_group_cache
*block_group
;
8112 list_for_each_entry(block_group
, groups_list
, list
) {
8113 spin_lock(&block_group
->lock
);
8115 if (!block_group
->ro
) {
8116 spin_unlock(&block_group
->lock
);
8120 if (block_group
->flags
& (BTRFS_BLOCK_GROUP_RAID1
|
8121 BTRFS_BLOCK_GROUP_RAID10
|
8122 BTRFS_BLOCK_GROUP_DUP
))
8127 free_bytes
+= (block_group
->key
.offset
-
8128 btrfs_block_group_used(&block_group
->item
)) *
8131 spin_unlock(&block_group
->lock
);
8138 * helper to account the unused space of all the readonly block group in the
8139 * space_info. takes mirrors into account.
8141 u64
btrfs_account_ro_block_groups_free_space(struct btrfs_space_info
*sinfo
)
8146 spin_lock(&sinfo
->lock
);
8148 for(i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++)
8149 if (!list_empty(&sinfo
->block_groups
[i
]))
8150 free_bytes
+= __btrfs_get_ro_block_group_free_space(
8151 &sinfo
->block_groups
[i
]);
8153 spin_unlock(&sinfo
->lock
);
8158 int btrfs_set_block_group_rw(struct btrfs_root
*root
,
8159 struct btrfs_block_group_cache
*cache
)
8161 struct btrfs_space_info
*sinfo
= cache
->space_info
;
8166 spin_lock(&sinfo
->lock
);
8167 spin_lock(&cache
->lock
);
8168 num_bytes
= cache
->key
.offset
- cache
->reserved
- cache
->pinned
-
8169 cache
->bytes_super
- btrfs_block_group_used(&cache
->item
);
8170 sinfo
->bytes_readonly
-= num_bytes
;
8172 spin_unlock(&cache
->lock
);
8173 spin_unlock(&sinfo
->lock
);
8178 * checks to see if its even possible to relocate this block group.
8180 * @return - -1 if it's not a good idea to relocate this block group, 0 if its
8181 * ok to go ahead and try.
8183 int btrfs_can_relocate(struct btrfs_root
*root
, u64 bytenr
)
8185 struct btrfs_block_group_cache
*block_group
;
8186 struct btrfs_space_info
*space_info
;
8187 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
8188 struct btrfs_device
*device
;
8192 block_group
= btrfs_lookup_block_group(root
->fs_info
, bytenr
);
8194 /* odd, couldn't find the block group, leave it alone */
8198 /* no bytes used, we're good */
8199 if (!btrfs_block_group_used(&block_group
->item
))
8202 space_info
= block_group
->space_info
;
8203 spin_lock(&space_info
->lock
);
8205 full
= space_info
->full
;
8208 * if this is the last block group we have in this space, we can't
8209 * relocate it unless we're able to allocate a new chunk below.
8211 * Otherwise, we need to make sure we have room in the space to handle
8212 * all of the extents from this block group. If we can, we're good
8214 if ((space_info
->total_bytes
!= block_group
->key
.offset
) &&
8215 (space_info
->bytes_used
+ space_info
->bytes_reserved
+
8216 space_info
->bytes_pinned
+ space_info
->bytes_readonly
+
8217 btrfs_block_group_used(&block_group
->item
) <
8218 space_info
->total_bytes
)) {
8219 spin_unlock(&space_info
->lock
);
8222 spin_unlock(&space_info
->lock
);
8225 * ok we don't have enough space, but maybe we have free space on our
8226 * devices to allocate new chunks for relocation, so loop through our
8227 * alloc devices and guess if we have enough space. However, if we
8228 * were marked as full, then we know there aren't enough chunks, and we
8235 mutex_lock(&root
->fs_info
->chunk_mutex
);
8236 list_for_each_entry(device
, &fs_devices
->alloc_list
, dev_alloc_list
) {
8237 u64 min_free
= btrfs_block_group_used(&block_group
->item
);
8241 * check to make sure we can actually find a chunk with enough
8242 * space to fit our block group in.
8244 if (device
->total_bytes
> device
->bytes_used
+ min_free
) {
8245 ret
= find_free_dev_extent(NULL
, device
, min_free
,
8252 mutex_unlock(&root
->fs_info
->chunk_mutex
);
8254 btrfs_put_block_group(block_group
);
8258 static int find_first_block_group(struct btrfs_root
*root
,
8259 struct btrfs_path
*path
, struct btrfs_key
*key
)
8262 struct btrfs_key found_key
;
8263 struct extent_buffer
*leaf
;
8266 ret
= btrfs_search_slot(NULL
, root
, key
, path
, 0, 0);
8271 slot
= path
->slots
[0];
8272 leaf
= path
->nodes
[0];
8273 if (slot
>= btrfs_header_nritems(leaf
)) {
8274 ret
= btrfs_next_leaf(root
, path
);
8281 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
8283 if (found_key
.objectid
>= key
->objectid
&&
8284 found_key
.type
== BTRFS_BLOCK_GROUP_ITEM_KEY
) {
8294 void btrfs_put_block_group_cache(struct btrfs_fs_info
*info
)
8296 struct btrfs_block_group_cache
*block_group
;
8300 struct inode
*inode
;
8302 block_group
= btrfs_lookup_first_block_group(info
, last
);
8303 while (block_group
) {
8304 spin_lock(&block_group
->lock
);
8305 if (block_group
->iref
)
8307 spin_unlock(&block_group
->lock
);
8308 block_group
= next_block_group(info
->tree_root
,
8318 inode
= block_group
->inode
;
8319 block_group
->iref
= 0;
8320 block_group
->inode
= NULL
;
8321 spin_unlock(&block_group
->lock
);
8323 last
= block_group
->key
.objectid
+ block_group
->key
.offset
;
8324 btrfs_put_block_group(block_group
);
8328 int btrfs_free_block_groups(struct btrfs_fs_info
*info
)
8330 struct btrfs_block_group_cache
*block_group
;
8331 struct btrfs_space_info
*space_info
;
8332 struct btrfs_caching_control
*caching_ctl
;
8335 down_write(&info
->extent_commit_sem
);
8336 while (!list_empty(&info
->caching_block_groups
)) {
8337 caching_ctl
= list_entry(info
->caching_block_groups
.next
,
8338 struct btrfs_caching_control
, list
);
8339 list_del(&caching_ctl
->list
);
8340 put_caching_control(caching_ctl
);
8342 up_write(&info
->extent_commit_sem
);
8344 spin_lock(&info
->block_group_cache_lock
);
8345 while ((n
= rb_last(&info
->block_group_cache_tree
)) != NULL
) {
8346 block_group
= rb_entry(n
, struct btrfs_block_group_cache
,
8348 rb_erase(&block_group
->cache_node
,
8349 &info
->block_group_cache_tree
);
8350 spin_unlock(&info
->block_group_cache_lock
);
8352 down_write(&block_group
->space_info
->groups_sem
);
8353 list_del(&block_group
->list
);
8354 up_write(&block_group
->space_info
->groups_sem
);
8356 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
8357 wait_block_group_cache_done(block_group
);
8360 * We haven't cached this block group, which means we could
8361 * possibly have excluded extents on this block group.
8363 if (block_group
->cached
== BTRFS_CACHE_NO
)
8364 free_excluded_extents(info
->extent_root
, block_group
);
8366 btrfs_remove_free_space_cache(block_group
);
8367 btrfs_put_block_group(block_group
);
8369 spin_lock(&info
->block_group_cache_lock
);
8371 spin_unlock(&info
->block_group_cache_lock
);
8373 /* now that all the block groups are freed, go through and
8374 * free all the space_info structs. This is only called during
8375 * the final stages of unmount, and so we know nobody is
8376 * using them. We call synchronize_rcu() once before we start,
8377 * just to be on the safe side.
8381 release_global_block_rsv(info
);
8383 while(!list_empty(&info
->space_info
)) {
8384 space_info
= list_entry(info
->space_info
.next
,
8385 struct btrfs_space_info
,
8387 if (space_info
->bytes_pinned
> 0 ||
8388 space_info
->bytes_reserved
> 0) {
8390 dump_space_info(space_info
, 0, 0);
8392 list_del(&space_info
->list
);
8398 static void __link_block_group(struct btrfs_space_info
*space_info
,
8399 struct btrfs_block_group_cache
*cache
)
8401 int index
= get_block_group_index(cache
);
8403 down_write(&space_info
->groups_sem
);
8404 list_add_tail(&cache
->list
, &space_info
->block_groups
[index
]);
8405 up_write(&space_info
->groups_sem
);
8408 int btrfs_read_block_groups(struct btrfs_root
*root
)
8410 struct btrfs_path
*path
;
8412 struct btrfs_block_group_cache
*cache
;
8413 struct btrfs_fs_info
*info
= root
->fs_info
;
8414 struct btrfs_space_info
*space_info
;
8415 struct btrfs_key key
;
8416 struct btrfs_key found_key
;
8417 struct extent_buffer
*leaf
;
8421 root
= info
->extent_root
;
8424 btrfs_set_key_type(&key
, BTRFS_BLOCK_GROUP_ITEM_KEY
);
8425 path
= btrfs_alloc_path();
8429 cache_gen
= btrfs_super_cache_generation(&root
->fs_info
->super_copy
);
8430 if (cache_gen
!= 0 &&
8431 btrfs_super_generation(&root
->fs_info
->super_copy
) != cache_gen
)
8433 if (btrfs_test_opt(root
, CLEAR_CACHE
))
8435 if (!btrfs_test_opt(root
, SPACE_CACHE
) && cache_gen
)
8436 printk(KERN_INFO
"btrfs: disk space caching is enabled\n");
8439 ret
= find_first_block_group(root
, path
, &key
);
8444 leaf
= path
->nodes
[0];
8445 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
8446 cache
= kzalloc(sizeof(*cache
), GFP_NOFS
);
8452 atomic_set(&cache
->count
, 1);
8453 spin_lock_init(&cache
->lock
);
8454 spin_lock_init(&cache
->tree_lock
);
8455 cache
->fs_info
= info
;
8456 INIT_LIST_HEAD(&cache
->list
);
8457 INIT_LIST_HEAD(&cache
->cluster_list
);
8460 cache
->disk_cache_state
= BTRFS_DC_CLEAR
;
8463 * we only want to have 32k of ram per block group for keeping
8464 * track of free space, and if we pass 1/2 of that we want to
8465 * start converting things over to using bitmaps
8467 cache
->extents_thresh
= ((1024 * 32) / 2) /
8468 sizeof(struct btrfs_free_space
);
8470 read_extent_buffer(leaf
, &cache
->item
,
8471 btrfs_item_ptr_offset(leaf
, path
->slots
[0]),
8472 sizeof(cache
->item
));
8473 memcpy(&cache
->key
, &found_key
, sizeof(found_key
));
8475 key
.objectid
= found_key
.objectid
+ found_key
.offset
;
8476 btrfs_release_path(root
, path
);
8477 cache
->flags
= btrfs_block_group_flags(&cache
->item
);
8478 cache
->sectorsize
= root
->sectorsize
;
8481 * We need to exclude the super stripes now so that the space
8482 * info has super bytes accounted for, otherwise we'll think
8483 * we have more space than we actually do.
8485 exclude_super_stripes(root
, cache
);
8488 * check for two cases, either we are full, and therefore
8489 * don't need to bother with the caching work since we won't
8490 * find any space, or we are empty, and we can just add all
8491 * the space in and be done with it. This saves us _alot_ of
8492 * time, particularly in the full case.
8494 if (found_key
.offset
== btrfs_block_group_used(&cache
->item
)) {
8495 cache
->last_byte_to_unpin
= (u64
)-1;
8496 cache
->cached
= BTRFS_CACHE_FINISHED
;
8497 free_excluded_extents(root
, cache
);
8498 } else if (btrfs_block_group_used(&cache
->item
) == 0) {
8499 cache
->last_byte_to_unpin
= (u64
)-1;
8500 cache
->cached
= BTRFS_CACHE_FINISHED
;
8501 add_new_free_space(cache
, root
->fs_info
,
8503 found_key
.objectid
+
8505 free_excluded_extents(root
, cache
);
8508 ret
= update_space_info(info
, cache
->flags
, found_key
.offset
,
8509 btrfs_block_group_used(&cache
->item
),
8512 cache
->space_info
= space_info
;
8513 spin_lock(&cache
->space_info
->lock
);
8514 cache
->space_info
->bytes_readonly
+= cache
->bytes_super
;
8515 spin_unlock(&cache
->space_info
->lock
);
8517 __link_block_group(space_info
, cache
);
8519 ret
= btrfs_add_block_group_cache(root
->fs_info
, cache
);
8522 set_avail_alloc_bits(root
->fs_info
, cache
->flags
);
8523 if (btrfs_chunk_readonly(root
, cache
->key
.objectid
))
8524 set_block_group_ro(cache
);
8527 list_for_each_entry_rcu(space_info
, &root
->fs_info
->space_info
, list
) {
8528 if (!(get_alloc_profile(root
, space_info
->flags
) &
8529 (BTRFS_BLOCK_GROUP_RAID10
|
8530 BTRFS_BLOCK_GROUP_RAID1
|
8531 BTRFS_BLOCK_GROUP_DUP
)))
8534 * avoid allocating from un-mirrored block group if there are
8535 * mirrored block groups.
8537 list_for_each_entry(cache
, &space_info
->block_groups
[3], list
)
8538 set_block_group_ro(cache
);
8539 list_for_each_entry(cache
, &space_info
->block_groups
[4], list
)
8540 set_block_group_ro(cache
);
8543 init_global_block_rsv(info
);
8546 btrfs_free_path(path
);
8550 int btrfs_make_block_group(struct btrfs_trans_handle
*trans
,
8551 struct btrfs_root
*root
, u64 bytes_used
,
8552 u64 type
, u64 chunk_objectid
, u64 chunk_offset
,
8556 struct btrfs_root
*extent_root
;
8557 struct btrfs_block_group_cache
*cache
;
8559 extent_root
= root
->fs_info
->extent_root
;
8561 root
->fs_info
->last_trans_log_full_commit
= trans
->transid
;
8563 cache
= kzalloc(sizeof(*cache
), GFP_NOFS
);
8567 cache
->key
.objectid
= chunk_offset
;
8568 cache
->key
.offset
= size
;
8569 cache
->key
.type
= BTRFS_BLOCK_GROUP_ITEM_KEY
;
8570 cache
->sectorsize
= root
->sectorsize
;
8571 cache
->fs_info
= root
->fs_info
;
8574 * we only want to have 32k of ram per block group for keeping track
8575 * of free space, and if we pass 1/2 of that we want to start
8576 * converting things over to using bitmaps
8578 cache
->extents_thresh
= ((1024 * 32) / 2) /
8579 sizeof(struct btrfs_free_space
);
8580 atomic_set(&cache
->count
, 1);
8581 spin_lock_init(&cache
->lock
);
8582 spin_lock_init(&cache
->tree_lock
);
8583 INIT_LIST_HEAD(&cache
->list
);
8584 INIT_LIST_HEAD(&cache
->cluster_list
);
8586 btrfs_set_block_group_used(&cache
->item
, bytes_used
);
8587 btrfs_set_block_group_chunk_objectid(&cache
->item
, chunk_objectid
);
8588 cache
->flags
= type
;
8589 btrfs_set_block_group_flags(&cache
->item
, type
);
8591 cache
->last_byte_to_unpin
= (u64
)-1;
8592 cache
->cached
= BTRFS_CACHE_FINISHED
;
8593 exclude_super_stripes(root
, cache
);
8595 add_new_free_space(cache
, root
->fs_info
, chunk_offset
,
8596 chunk_offset
+ size
);
8598 free_excluded_extents(root
, cache
);
8600 ret
= update_space_info(root
->fs_info
, cache
->flags
, size
, bytes_used
,
8601 &cache
->space_info
);
8604 spin_lock(&cache
->space_info
->lock
);
8605 cache
->space_info
->bytes_readonly
+= cache
->bytes_super
;
8606 spin_unlock(&cache
->space_info
->lock
);
8608 __link_block_group(cache
->space_info
, cache
);
8610 ret
= btrfs_add_block_group_cache(root
->fs_info
, cache
);
8613 ret
= btrfs_insert_item(trans
, extent_root
, &cache
->key
, &cache
->item
,
8614 sizeof(cache
->item
));
8617 set_avail_alloc_bits(extent_root
->fs_info
, type
);
8622 int btrfs_remove_block_group(struct btrfs_trans_handle
*trans
,
8623 struct btrfs_root
*root
, u64 group_start
)
8625 struct btrfs_path
*path
;
8626 struct btrfs_block_group_cache
*block_group
;
8627 struct btrfs_free_cluster
*cluster
;
8628 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
8629 struct btrfs_key key
;
8630 struct inode
*inode
;
8634 root
= root
->fs_info
->extent_root
;
8636 block_group
= btrfs_lookup_block_group(root
->fs_info
, group_start
);
8637 BUG_ON(!block_group
);
8638 BUG_ON(!block_group
->ro
);
8640 memcpy(&key
, &block_group
->key
, sizeof(key
));
8641 if (block_group
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
8642 BTRFS_BLOCK_GROUP_RAID1
|
8643 BTRFS_BLOCK_GROUP_RAID10
))
8648 /* make sure this block group isn't part of an allocation cluster */
8649 cluster
= &root
->fs_info
->data_alloc_cluster
;
8650 spin_lock(&cluster
->refill_lock
);
8651 btrfs_return_cluster_to_free_space(block_group
, cluster
);
8652 spin_unlock(&cluster
->refill_lock
);
8655 * make sure this block group isn't part of a metadata
8656 * allocation cluster
8658 cluster
= &root
->fs_info
->meta_alloc_cluster
;
8659 spin_lock(&cluster
->refill_lock
);
8660 btrfs_return_cluster_to_free_space(block_group
, cluster
);
8661 spin_unlock(&cluster
->refill_lock
);
8663 path
= btrfs_alloc_path();
8666 inode
= lookup_free_space_inode(root
, block_group
, path
);
8667 if (!IS_ERR(inode
)) {
8668 btrfs_orphan_add(trans
, inode
);
8670 /* One for the block groups ref */
8671 spin_lock(&block_group
->lock
);
8672 if (block_group
->iref
) {
8673 block_group
->iref
= 0;
8674 block_group
->inode
= NULL
;
8675 spin_unlock(&block_group
->lock
);
8678 spin_unlock(&block_group
->lock
);
8680 /* One for our lookup ref */
8684 key
.objectid
= BTRFS_FREE_SPACE_OBJECTID
;
8685 key
.offset
= block_group
->key
.objectid
;
8688 ret
= btrfs_search_slot(trans
, tree_root
, &key
, path
, -1, 1);
8692 btrfs_release_path(tree_root
, path
);
8694 ret
= btrfs_del_item(trans
, tree_root
, path
);
8697 btrfs_release_path(tree_root
, path
);
8700 spin_lock(&root
->fs_info
->block_group_cache_lock
);
8701 rb_erase(&block_group
->cache_node
,
8702 &root
->fs_info
->block_group_cache_tree
);
8703 spin_unlock(&root
->fs_info
->block_group_cache_lock
);
8705 down_write(&block_group
->space_info
->groups_sem
);
8707 * we must use list_del_init so people can check to see if they
8708 * are still on the list after taking the semaphore
8710 list_del_init(&block_group
->list
);
8711 up_write(&block_group
->space_info
->groups_sem
);
8713 if (block_group
->cached
== BTRFS_CACHE_STARTED
)
8714 wait_block_group_cache_done(block_group
);
8716 btrfs_remove_free_space_cache(block_group
);
8718 spin_lock(&block_group
->space_info
->lock
);
8719 block_group
->space_info
->total_bytes
-= block_group
->key
.offset
;
8720 block_group
->space_info
->bytes_readonly
-= block_group
->key
.offset
;
8721 block_group
->space_info
->disk_total
-= block_group
->key
.offset
* factor
;
8722 spin_unlock(&block_group
->space_info
->lock
);
8724 memcpy(&key
, &block_group
->key
, sizeof(key
));
8726 btrfs_clear_space_info_full(root
->fs_info
);
8728 btrfs_put_block_group(block_group
);
8729 btrfs_put_block_group(block_group
);
8731 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
8737 ret
= btrfs_del_item(trans
, root
, path
);
8739 btrfs_free_path(path
);
8743 int btrfs_error_unpin_extent_range(struct btrfs_root
*root
, u64 start
, u64 end
)
8745 return unpin_extent_range(root
, start
, end
);
8748 int btrfs_error_discard_extent(struct btrfs_root
*root
, u64 bytenr
,
8751 return btrfs_discard_extent(root
, bytenr
, num_bytes
);