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>
25 #include "print-tree.h"
26 #include "transaction.h"
30 #define BLOCK_GROUP_DATA EXTENT_WRITEBACK
31 #define BLOCK_GROUP_METADATA EXTENT_UPTODATE
32 #define BLOCK_GROUP_SYSTEM EXTENT_NEW
34 #define BLOCK_GROUP_DIRTY EXTENT_DIRTY
36 static int finish_current_insert(struct btrfs_trans_handle
*trans
, struct
37 btrfs_root
*extent_root
);
38 static int del_pending_extents(struct btrfs_trans_handle
*trans
, struct
39 btrfs_root
*extent_root
);
40 static struct btrfs_block_group_cache
*
41 __btrfs_find_block_group(struct btrfs_root
*root
,
42 struct btrfs_block_group_cache
*hint
,
43 u64 search_start
, int data
, int owner
);
45 void maybe_lock_mutex(struct btrfs_root
*root
)
47 if (root
!= root
->fs_info
->extent_root
&&
48 root
!= root
->fs_info
->chunk_root
&&
49 root
!= root
->fs_info
->dev_root
) {
50 mutex_lock(&root
->fs_info
->alloc_mutex
);
54 void maybe_unlock_mutex(struct btrfs_root
*root
)
56 if (root
!= root
->fs_info
->extent_root
&&
57 root
!= root
->fs_info
->chunk_root
&&
58 root
!= root
->fs_info
->dev_root
) {
59 mutex_unlock(&root
->fs_info
->alloc_mutex
);
63 static int cache_block_group(struct btrfs_root
*root
,
64 struct btrfs_block_group_cache
*block_group
)
66 struct btrfs_path
*path
;
69 struct extent_buffer
*leaf
;
70 struct extent_io_tree
*free_space_cache
;
80 root
= root
->fs_info
->extent_root
;
81 free_space_cache
= &root
->fs_info
->free_space_cache
;
83 if (block_group
->cached
)
86 path
= btrfs_alloc_path();
92 * we get into deadlocks with paths held by callers of this function.
93 * since the alloc_mutex is protecting things right now, just
94 * skip the locking here
96 path
->skip_locking
= 1;
97 first_free
= block_group
->key
.objectid
;
98 key
.objectid
= block_group
->key
.objectid
;
100 btrfs_set_key_type(&key
, BTRFS_EXTENT_ITEM_KEY
);
101 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
104 ret
= btrfs_previous_item(root
, path
, 0, BTRFS_EXTENT_ITEM_KEY
);
108 leaf
= path
->nodes
[0];
109 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
110 if (key
.objectid
+ key
.offset
> first_free
)
111 first_free
= key
.objectid
+ key
.offset
;
114 leaf
= path
->nodes
[0];
115 slot
= path
->slots
[0];
116 if (slot
>= btrfs_header_nritems(leaf
)) {
117 ret
= btrfs_next_leaf(root
, path
);
126 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
127 if (key
.objectid
< block_group
->key
.objectid
) {
130 if (key
.objectid
>= block_group
->key
.objectid
+
131 block_group
->key
.offset
) {
135 if (btrfs_key_type(&key
) == BTRFS_EXTENT_ITEM_KEY
) {
140 if (key
.objectid
> last
) {
141 hole_size
= key
.objectid
- last
;
142 set_extent_dirty(free_space_cache
, last
,
143 last
+ hole_size
- 1,
146 last
= key
.objectid
+ key
.offset
;
154 if (block_group
->key
.objectid
+
155 block_group
->key
.offset
> last
) {
156 hole_size
= block_group
->key
.objectid
+
157 block_group
->key
.offset
- last
;
158 set_extent_dirty(free_space_cache
, last
,
159 last
+ hole_size
- 1, GFP_NOFS
);
161 block_group
->cached
= 1;
163 btrfs_free_path(path
);
167 struct btrfs_block_group_cache
*btrfs_lookup_first_block_group(struct
171 struct extent_io_tree
*block_group_cache
;
172 struct btrfs_block_group_cache
*block_group
= NULL
;
178 bytenr
= max_t(u64
, bytenr
,
179 BTRFS_SUPER_INFO_OFFSET
+ BTRFS_SUPER_INFO_SIZE
);
180 block_group_cache
= &info
->block_group_cache
;
181 ret
= find_first_extent_bit(block_group_cache
,
182 bytenr
, &start
, &end
,
183 BLOCK_GROUP_DATA
| BLOCK_GROUP_METADATA
|
188 ret
= get_state_private(block_group_cache
, start
, &ptr
);
192 block_group
= (struct btrfs_block_group_cache
*)(unsigned long)ptr
;
196 struct btrfs_block_group_cache
*btrfs_lookup_block_group(struct
200 struct extent_io_tree
*block_group_cache
;
201 struct btrfs_block_group_cache
*block_group
= NULL
;
207 bytenr
= max_t(u64
, bytenr
,
208 BTRFS_SUPER_INFO_OFFSET
+ BTRFS_SUPER_INFO_SIZE
);
209 block_group_cache
= &info
->block_group_cache
;
210 ret
= find_first_extent_bit(block_group_cache
,
211 bytenr
, &start
, &end
,
212 BLOCK_GROUP_DATA
| BLOCK_GROUP_METADATA
|
217 ret
= get_state_private(block_group_cache
, start
, &ptr
);
221 block_group
= (struct btrfs_block_group_cache
*)(unsigned long)ptr
;
222 if (block_group
->key
.objectid
<= bytenr
&& bytenr
<
223 block_group
->key
.objectid
+ block_group
->key
.offset
)
228 static int block_group_bits(struct btrfs_block_group_cache
*cache
, u64 bits
)
230 return (cache
->flags
& bits
) == bits
;
233 static int noinline
find_search_start(struct btrfs_root
*root
,
234 struct btrfs_block_group_cache
**cache_ret
,
235 u64
*start_ret
, u64 num
, int data
)
238 struct btrfs_block_group_cache
*cache
= *cache_ret
;
239 struct extent_io_tree
*free_space_cache
;
240 struct extent_state
*state
;
245 u64 search_start
= *start_ret
;
248 total_fs_bytes
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
249 free_space_cache
= &root
->fs_info
->free_space_cache
;
255 ret
= cache_block_group(root
, cache
);
260 last
= max(search_start
, cache
->key
.objectid
);
261 if (!block_group_bits(cache
, data
) || cache
->ro
)
264 spin_lock_irq(&free_space_cache
->lock
);
265 state
= find_first_extent_bit_state(free_space_cache
, last
, EXTENT_DIRTY
);
270 spin_unlock_irq(&free_space_cache
->lock
);
274 start
= max(last
, state
->start
);
275 last
= state
->end
+ 1;
276 if (last
- start
< num
) {
278 state
= extent_state_next(state
);
279 } while(state
&& !(state
->state
& EXTENT_DIRTY
));
282 spin_unlock_irq(&free_space_cache
->lock
);
286 if (start
+ num
> cache
->key
.objectid
+ cache
->key
.offset
)
288 if (!block_group_bits(cache
, data
)) {
289 printk("block group bits don't match %Lu %d\n", cache
->flags
, data
);
295 cache
= btrfs_lookup_block_group(root
->fs_info
, search_start
);
297 printk("Unable to find block group for %Lu\n", search_start
);
303 last
= cache
->key
.objectid
+ cache
->key
.offset
;
305 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
306 if (!cache
|| cache
->key
.objectid
>= total_fs_bytes
) {
315 if (cache_miss
&& !cache
->cached
) {
316 cache_block_group(root
, cache
);
318 cache
= btrfs_lookup_first_block_group(root
->fs_info
, last
);
321 cache
= __btrfs_find_block_group(root
, cache
, last
, data
, 0);
328 static u64
div_factor(u64 num
, int factor
)
337 static int block_group_state_bits(u64 flags
)
340 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
341 bits
|= BLOCK_GROUP_DATA
;
342 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
343 bits
|= BLOCK_GROUP_METADATA
;
344 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
345 bits
|= BLOCK_GROUP_SYSTEM
;
349 static struct btrfs_block_group_cache
*
350 __btrfs_find_block_group(struct btrfs_root
*root
,
351 struct btrfs_block_group_cache
*hint
,
352 u64 search_start
, int data
, int owner
)
354 struct btrfs_block_group_cache
*cache
;
355 struct extent_io_tree
*block_group_cache
;
356 struct btrfs_block_group_cache
*found_group
= NULL
;
357 struct btrfs_fs_info
*info
= root
->fs_info
;
370 block_group_cache
= &info
->block_group_cache
;
372 if (data
& BTRFS_BLOCK_GROUP_METADATA
)
375 bit
= block_group_state_bits(data
);
378 struct btrfs_block_group_cache
*shint
;
379 shint
= btrfs_lookup_first_block_group(info
, search_start
);
380 if (shint
&& block_group_bits(shint
, data
) && !shint
->ro
) {
381 used
= btrfs_block_group_used(&shint
->item
);
382 if (used
+ shint
->pinned
<
383 div_factor(shint
->key
.offset
, factor
)) {
388 if (hint
&& !hint
->ro
&& block_group_bits(hint
, data
)) {
389 used
= btrfs_block_group_used(&hint
->item
);
390 if (used
+ hint
->pinned
<
391 div_factor(hint
->key
.offset
, factor
)) {
394 last
= hint
->key
.objectid
+ hint
->key
.offset
;
397 last
= max(hint
->key
.objectid
, search_start
);
403 ret
= find_first_extent_bit(block_group_cache
, last
,
408 ret
= get_state_private(block_group_cache
, start
, &ptr
);
414 cache
= (struct btrfs_block_group_cache
*)(unsigned long)ptr
;
415 last
= cache
->key
.objectid
+ cache
->key
.offset
;
416 used
= btrfs_block_group_used(&cache
->item
);
418 if (!cache
->ro
&& block_group_bits(cache
, data
)) {
419 free_check
= div_factor(cache
->key
.offset
, factor
);
420 if (used
+ cache
->pinned
< free_check
) {
432 if (!full_search
&& factor
< 10) {
442 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
443 struct btrfs_block_group_cache
444 *hint
, u64 search_start
,
448 struct btrfs_block_group_cache
*ret
;
449 mutex_lock(&root
->fs_info
->alloc_mutex
);
450 ret
= __btrfs_find_block_group(root
, hint
, search_start
, data
, owner
);
451 mutex_unlock(&root
->fs_info
->alloc_mutex
);
454 static u64
hash_extent_ref(u64 root_objectid
, u64 ref_generation
,
455 u64 owner
, u64 owner_offset
)
457 u32 high_crc
= ~(u32
)0;
458 u32 low_crc
= ~(u32
)0;
460 lenum
= cpu_to_le64(root_objectid
);
461 high_crc
= btrfs_crc32c(high_crc
, &lenum
, sizeof(lenum
));
462 lenum
= cpu_to_le64(ref_generation
);
463 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
464 if (owner
>= BTRFS_FIRST_FREE_OBJECTID
) {
465 lenum
= cpu_to_le64(owner
);
466 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
467 lenum
= cpu_to_le64(owner_offset
);
468 low_crc
= btrfs_crc32c(low_crc
, &lenum
, sizeof(lenum
));
470 return ((u64
)high_crc
<< 32) | (u64
)low_crc
;
473 static int match_extent_ref(struct extent_buffer
*leaf
,
474 struct btrfs_extent_ref
*disk_ref
,
475 struct btrfs_extent_ref
*cpu_ref
)
480 if (cpu_ref
->objectid
)
481 len
= sizeof(*cpu_ref
);
483 len
= 2 * sizeof(u64
);
484 ret
= memcmp_extent_buffer(leaf
, cpu_ref
, (unsigned long)disk_ref
,
489 static int noinline
lookup_extent_backref(struct btrfs_trans_handle
*trans
,
490 struct btrfs_root
*root
,
491 struct btrfs_path
*path
, u64 bytenr
,
493 u64 ref_generation
, u64 owner
,
494 u64 owner_offset
, int del
)
497 struct btrfs_key key
;
498 struct btrfs_key found_key
;
499 struct btrfs_extent_ref ref
;
500 struct extent_buffer
*leaf
;
501 struct btrfs_extent_ref
*disk_ref
;
505 btrfs_set_stack_ref_root(&ref
, root_objectid
);
506 btrfs_set_stack_ref_generation(&ref
, ref_generation
);
507 btrfs_set_stack_ref_objectid(&ref
, owner
);
508 btrfs_set_stack_ref_offset(&ref
, owner_offset
);
510 hash
= hash_extent_ref(root_objectid
, ref_generation
, owner
,
513 key
.objectid
= bytenr
;
514 key
.type
= BTRFS_EXTENT_REF_KEY
;
517 ret
= btrfs_search_slot(trans
, root
, &key
, path
,
521 leaf
= path
->nodes
[0];
523 u32 nritems
= btrfs_header_nritems(leaf
);
524 if (path
->slots
[0] >= nritems
) {
525 ret2
= btrfs_next_leaf(root
, path
);
528 leaf
= path
->nodes
[0];
530 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
531 if (found_key
.objectid
!= bytenr
||
532 found_key
.type
!= BTRFS_EXTENT_REF_KEY
)
534 key
.offset
= found_key
.offset
;
536 btrfs_release_path(root
, path
);
540 disk_ref
= btrfs_item_ptr(path
->nodes
[0],
542 struct btrfs_extent_ref
);
543 if (match_extent_ref(path
->nodes
[0], disk_ref
, &ref
)) {
547 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
548 key
.offset
= found_key
.offset
+ 1;
549 btrfs_release_path(root
, path
);
556 * Back reference rules. Back refs have three main goals:
558 * 1) differentiate between all holders of references to an extent so that
559 * when a reference is dropped we can make sure it was a valid reference
560 * before freeing the extent.
562 * 2) Provide enough information to quickly find the holders of an extent
563 * if we notice a given block is corrupted or bad.
565 * 3) Make it easy to migrate blocks for FS shrinking or storage pool
566 * maintenance. This is actually the same as #2, but with a slightly
567 * different use case.
569 * File extents can be referenced by:
571 * - multiple snapshots, subvolumes, or different generations in one subvol
572 * - different files inside a single subvolume (in theory, not implemented yet)
573 * - different offsets inside a file (bookend extents in file.c)
575 * The extent ref structure has fields for:
577 * - Objectid of the subvolume root
578 * - Generation number of the tree holding the reference
579 * - objectid of the file holding the reference
580 * - offset in the file corresponding to the key holding the reference
582 * When a file extent is allocated the fields are filled in:
583 * (root_key.objectid, trans->transid, inode objectid, offset in file)
585 * When a leaf is cow'd new references are added for every file extent found
586 * in the leaf. It looks the same as the create case, but trans->transid
587 * will be different when the block is cow'd.
589 * (root_key.objectid, trans->transid, inode objectid, offset in file)
591 * When a file extent is removed either during snapshot deletion or file
592 * truncation, the corresponding back reference is found
595 * (btrfs_header_owner(leaf), btrfs_header_generation(leaf),
596 * inode objectid, offset in file)
598 * Btree extents can be referenced by:
600 * - Different subvolumes
601 * - Different generations of the same subvolume
603 * Storing sufficient information for a full reverse mapping of a btree
604 * block would require storing the lowest key of the block in the backref,
605 * and it would require updating that lowest key either before write out or
606 * every time it changed. Instead, the objectid of the lowest key is stored
607 * along with the level of the tree block. This provides a hint
608 * about where in the btree the block can be found. Searches through the
609 * btree only need to look for a pointer to that block, so they stop one
610 * level higher than the level recorded in the backref.
612 * Some btrees do not do reference counting on their extents. These
613 * include the extent tree and the tree of tree roots. Backrefs for these
614 * trees always have a generation of zero.
616 * When a tree block is created, back references are inserted:
618 * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid)
620 * When a tree block is cow'd in a reference counted root,
621 * new back references are added for all the blocks it points to.
622 * These are of the form (trans->transid will have increased since creation):
624 * (root->root_key.objectid, trans->transid, level, lowest_key_objectid)
626 * Because the lowest_key_objectid and the level are just hints
627 * they are not used when backrefs are deleted. When a backref is deleted:
629 * if backref was for a tree root:
630 * root_objectid = root->root_key.objectid
632 * root_objectid = btrfs_header_owner(parent)
634 * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0)
636 * Back Reference Key hashing:
638 * Back references have four fields, each 64 bits long. Unfortunately,
639 * This is hashed into a single 64 bit number and placed into the key offset.
640 * The key objectid corresponds to the first byte in the extent, and the
641 * key type is set to BTRFS_EXTENT_REF_KEY
643 int btrfs_insert_extent_backref(struct btrfs_trans_handle
*trans
,
644 struct btrfs_root
*root
,
645 struct btrfs_path
*path
, u64 bytenr
,
646 u64 root_objectid
, u64 ref_generation
,
647 u64 owner
, u64 owner_offset
)
650 struct btrfs_key key
;
651 struct btrfs_extent_ref ref
;
652 struct btrfs_extent_ref
*disk_ref
;
655 btrfs_set_stack_ref_root(&ref
, root_objectid
);
656 btrfs_set_stack_ref_generation(&ref
, ref_generation
);
657 btrfs_set_stack_ref_objectid(&ref
, owner
);
658 btrfs_set_stack_ref_offset(&ref
, owner_offset
);
660 hash
= hash_extent_ref(root_objectid
, ref_generation
, owner
,
663 key
.objectid
= bytenr
;
664 key
.type
= BTRFS_EXTENT_REF_KEY
;
666 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, sizeof(ref
));
667 while (ret
== -EEXIST
) {
668 disk_ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
669 struct btrfs_extent_ref
);
670 if (match_extent_ref(path
->nodes
[0], disk_ref
, &ref
))
673 btrfs_release_path(root
, path
);
674 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
679 disk_ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
680 struct btrfs_extent_ref
);
681 write_extent_buffer(path
->nodes
[0], &ref
, (unsigned long)disk_ref
,
683 btrfs_mark_buffer_dirty(path
->nodes
[0]);
685 btrfs_release_path(root
, path
);
689 static int __btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
690 struct btrfs_root
*root
,
691 u64 bytenr
, u64 num_bytes
,
692 u64 root_objectid
, u64 ref_generation
,
693 u64 owner
, u64 owner_offset
)
695 struct btrfs_path
*path
;
697 struct btrfs_key key
;
698 struct extent_buffer
*l
;
699 struct btrfs_extent_item
*item
;
702 WARN_ON(num_bytes
< root
->sectorsize
);
703 path
= btrfs_alloc_path();
708 key
.objectid
= bytenr
;
709 btrfs_set_key_type(&key
, BTRFS_EXTENT_ITEM_KEY
);
710 key
.offset
= num_bytes
;
711 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
, &key
, path
,
720 item
= btrfs_item_ptr(l
, path
->slots
[0], struct btrfs_extent_item
);
721 refs
= btrfs_extent_refs(l
, item
);
722 btrfs_set_extent_refs(l
, item
, refs
+ 1);
723 btrfs_mark_buffer_dirty(path
->nodes
[0]);
725 btrfs_release_path(root
->fs_info
->extent_root
, path
);
728 ret
= btrfs_insert_extent_backref(trans
, root
->fs_info
->extent_root
,
729 path
, bytenr
, root_objectid
,
730 ref_generation
, owner
, owner_offset
);
732 finish_current_insert(trans
, root
->fs_info
->extent_root
);
733 del_pending_extents(trans
, root
->fs_info
->extent_root
);
735 btrfs_free_path(path
);
739 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
740 struct btrfs_root
*root
,
741 u64 bytenr
, u64 num_bytes
,
742 u64 root_objectid
, u64 ref_generation
,
743 u64 owner
, u64 owner_offset
)
747 mutex_lock(&root
->fs_info
->alloc_mutex
);
748 ret
= __btrfs_inc_extent_ref(trans
, root
, bytenr
, num_bytes
,
749 root_objectid
, ref_generation
,
750 owner
, owner_offset
);
751 mutex_unlock(&root
->fs_info
->alloc_mutex
);
755 int btrfs_extent_post_op(struct btrfs_trans_handle
*trans
,
756 struct btrfs_root
*root
)
758 finish_current_insert(trans
, root
->fs_info
->extent_root
);
759 del_pending_extents(trans
, root
->fs_info
->extent_root
);
763 static int lookup_extent_ref(struct btrfs_trans_handle
*trans
,
764 struct btrfs_root
*root
, u64 bytenr
,
765 u64 num_bytes
, u32
*refs
)
767 struct btrfs_path
*path
;
769 struct btrfs_key key
;
770 struct extent_buffer
*l
;
771 struct btrfs_extent_item
*item
;
773 WARN_ON(num_bytes
< root
->sectorsize
);
774 path
= btrfs_alloc_path();
776 key
.objectid
= bytenr
;
777 key
.offset
= num_bytes
;
778 btrfs_set_key_type(&key
, BTRFS_EXTENT_ITEM_KEY
);
779 ret
= btrfs_search_slot(trans
, root
->fs_info
->extent_root
, &key
, path
,
784 btrfs_print_leaf(root
, path
->nodes
[0]);
785 printk("failed to find block number %Lu\n", bytenr
);
789 item
= btrfs_item_ptr(l
, path
->slots
[0], struct btrfs_extent_item
);
790 *refs
= btrfs_extent_refs(l
, item
);
792 btrfs_free_path(path
);
796 u32
btrfs_count_snapshots_in_path(struct btrfs_root
*root
,
797 struct btrfs_path
*count_path
,
801 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
802 struct btrfs_path
*path
;
806 u64 root_objectid
= root
->root_key
.objectid
;
812 struct btrfs_key key
;
813 struct btrfs_key found_key
;
814 struct extent_buffer
*l
;
815 struct btrfs_extent_item
*item
;
816 struct btrfs_extent_ref
*ref_item
;
819 /* FIXME, needs locking */
822 mutex_lock(&root
->fs_info
->alloc_mutex
);
823 path
= btrfs_alloc_path();
826 bytenr
= first_extent
;
828 bytenr
= count_path
->nodes
[level
]->start
;
831 key
.objectid
= bytenr
;
834 btrfs_set_key_type(&key
, BTRFS_EXTENT_ITEM_KEY
);
835 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
841 btrfs_item_key_to_cpu(l
, &found_key
, path
->slots
[0]);
843 if (found_key
.objectid
!= bytenr
||
844 found_key
.type
!= BTRFS_EXTENT_ITEM_KEY
) {
848 item
= btrfs_item_ptr(l
, path
->slots
[0], struct btrfs_extent_item
);
849 extent_refs
= btrfs_extent_refs(l
, item
);
852 nritems
= btrfs_header_nritems(l
);
853 if (path
->slots
[0] >= nritems
) {
854 ret
= btrfs_next_leaf(extent_root
, path
);
859 btrfs_item_key_to_cpu(l
, &found_key
, path
->slots
[0]);
860 if (found_key
.objectid
!= bytenr
)
863 if (found_key
.type
!= BTRFS_EXTENT_REF_KEY
) {
869 ref_item
= btrfs_item_ptr(l
, path
->slots
[0],
870 struct btrfs_extent_ref
);
871 found_objectid
= btrfs_ref_root(l
, ref_item
);
873 if (found_objectid
!= root_objectid
) {
878 found_owner
= btrfs_ref_objectid(l
, ref_item
);
879 if (found_owner
!= expected_owner
) {
884 * nasty. we don't count a reference held by
885 * the running transaction. This allows nodatacow
886 * to avoid cow most of the time
888 if (found_owner
>= BTRFS_FIRST_FREE_OBJECTID
&&
889 btrfs_ref_generation(l
, ref_item
) ==
890 root
->fs_info
->generation
) {
898 * if there is more than one reference against a data extent,
899 * we have to assume the other ref is another snapshot
901 if (level
== -1 && extent_refs
> 1) {
905 if (cur_count
== 0) {
909 if (level
>= 0 && root
->node
== count_path
->nodes
[level
])
912 btrfs_release_path(root
, path
);
916 btrfs_free_path(path
);
917 mutex_unlock(&root
->fs_info
->alloc_mutex
);
921 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
922 struct extent_buffer
*buf
)
926 struct btrfs_key key
;
927 struct btrfs_file_extent_item
*fi
;
936 mutex_lock(&root
->fs_info
->alloc_mutex
);
937 level
= btrfs_header_level(buf
);
938 nritems
= btrfs_header_nritems(buf
);
939 for (i
= 0; i
< nritems
; i
++) {
942 btrfs_item_key_to_cpu(buf
, &key
, i
);
943 if (btrfs_key_type(&key
) != BTRFS_EXTENT_DATA_KEY
)
945 fi
= btrfs_item_ptr(buf
, i
,
946 struct btrfs_file_extent_item
);
947 if (btrfs_file_extent_type(buf
, fi
) ==
948 BTRFS_FILE_EXTENT_INLINE
)
950 disk_bytenr
= btrfs_file_extent_disk_bytenr(buf
, fi
);
951 if (disk_bytenr
== 0)
953 ret
= __btrfs_inc_extent_ref(trans
, root
, disk_bytenr
,
954 btrfs_file_extent_disk_num_bytes(buf
, fi
),
955 root
->root_key
.objectid
, trans
->transid
,
956 key
.objectid
, key
.offset
);
962 bytenr
= btrfs_node_blockptr(buf
, i
);
963 btrfs_node_key_to_cpu(buf
, &key
, i
);
964 ret
= __btrfs_inc_extent_ref(trans
, root
, bytenr
,
965 btrfs_level_size(root
, level
- 1),
966 root
->root_key
.objectid
,
968 level
- 1, key
.objectid
);
975 mutex_unlock(&root
->fs_info
->alloc_mutex
);
980 for (i
=0; i
< faili
; i
++) {
983 btrfs_item_key_to_cpu(buf
, &key
, i
);
984 if (btrfs_key_type(&key
) != BTRFS_EXTENT_DATA_KEY
)
986 fi
= btrfs_item_ptr(buf
, i
,
987 struct btrfs_file_extent_item
);
988 if (btrfs_file_extent_type(buf
, fi
) ==
989 BTRFS_FILE_EXTENT_INLINE
)
991 disk_bytenr
= btrfs_file_extent_disk_bytenr(buf
, fi
);
992 if (disk_bytenr
== 0)
994 err
= btrfs_free_extent(trans
, root
, disk_bytenr
,
995 btrfs_file_extent_disk_num_bytes(buf
,
999 bytenr
= btrfs_node_blockptr(buf
, i
);
1000 err
= btrfs_free_extent(trans
, root
, bytenr
,
1001 btrfs_level_size(root
, level
- 1), 0);
1006 mutex_unlock(&root
->fs_info
->alloc_mutex
);
1010 static int write_one_cache_group(struct btrfs_trans_handle
*trans
,
1011 struct btrfs_root
*root
,
1012 struct btrfs_path
*path
,
1013 struct btrfs_block_group_cache
*cache
)
1017 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
1019 struct extent_buffer
*leaf
;
1021 ret
= btrfs_search_slot(trans
, extent_root
, &cache
->key
, path
, 0, 1);
1026 leaf
= path
->nodes
[0];
1027 bi
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
1028 write_extent_buffer(leaf
, &cache
->item
, bi
, sizeof(cache
->item
));
1029 btrfs_mark_buffer_dirty(leaf
);
1030 btrfs_release_path(extent_root
, path
);
1032 finish_current_insert(trans
, extent_root
);
1033 pending_ret
= del_pending_extents(trans
, extent_root
);
1042 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
1043 struct btrfs_root
*root
)
1045 struct extent_io_tree
*block_group_cache
;
1046 struct btrfs_block_group_cache
*cache
;
1050 struct btrfs_path
*path
;
1056 block_group_cache
= &root
->fs_info
->block_group_cache
;
1057 path
= btrfs_alloc_path();
1061 mutex_lock(&root
->fs_info
->alloc_mutex
);
1063 ret
= find_first_extent_bit(block_group_cache
, last
,
1064 &start
, &end
, BLOCK_GROUP_DIRTY
);
1069 ret
= get_state_private(block_group_cache
, start
, &ptr
);
1072 cache
= (struct btrfs_block_group_cache
*)(unsigned long)ptr
;
1073 err
= write_one_cache_group(trans
, root
,
1076 * if we fail to write the cache group, we want
1077 * to keep it marked dirty in hopes that a later
1084 clear_extent_bits(block_group_cache
, start
, end
,
1085 BLOCK_GROUP_DIRTY
, GFP_NOFS
);
1087 btrfs_free_path(path
);
1088 mutex_unlock(&root
->fs_info
->alloc_mutex
);
1092 static struct btrfs_space_info
*__find_space_info(struct btrfs_fs_info
*info
,
1095 struct list_head
*head
= &info
->space_info
;
1096 struct list_head
*cur
;
1097 struct btrfs_space_info
*found
;
1098 list_for_each(cur
, head
) {
1099 found
= list_entry(cur
, struct btrfs_space_info
, list
);
1100 if (found
->flags
== flags
)
1107 static int update_space_info(struct btrfs_fs_info
*info
, u64 flags
,
1108 u64 total_bytes
, u64 bytes_used
,
1109 struct btrfs_space_info
**space_info
)
1111 struct btrfs_space_info
*found
;
1113 found
= __find_space_info(info
, flags
);
1115 found
->total_bytes
+= total_bytes
;
1116 found
->bytes_used
+= bytes_used
;
1118 WARN_ON(found
->total_bytes
< found
->bytes_used
);
1119 *space_info
= found
;
1122 found
= kmalloc(sizeof(*found
), GFP_NOFS
);
1126 list_add(&found
->list
, &info
->space_info
);
1127 found
->flags
= flags
;
1128 found
->total_bytes
= total_bytes
;
1129 found
->bytes_used
= bytes_used
;
1130 found
->bytes_pinned
= 0;
1132 found
->force_alloc
= 0;
1133 *space_info
= found
;
1137 static void set_avail_alloc_bits(struct btrfs_fs_info
*fs_info
, u64 flags
)
1139 u64 extra_flags
= flags
& (BTRFS_BLOCK_GROUP_RAID0
|
1140 BTRFS_BLOCK_GROUP_RAID1
|
1141 BTRFS_BLOCK_GROUP_RAID10
|
1142 BTRFS_BLOCK_GROUP_DUP
);
1144 if (flags
& BTRFS_BLOCK_GROUP_DATA
)
1145 fs_info
->avail_data_alloc_bits
|= extra_flags
;
1146 if (flags
& BTRFS_BLOCK_GROUP_METADATA
)
1147 fs_info
->avail_metadata_alloc_bits
|= extra_flags
;
1148 if (flags
& BTRFS_BLOCK_GROUP_SYSTEM
)
1149 fs_info
->avail_system_alloc_bits
|= extra_flags
;
1153 static u64
reduce_alloc_profile(struct btrfs_root
*root
, u64 flags
)
1155 u64 num_devices
= root
->fs_info
->fs_devices
->num_devices
;
1157 if (num_devices
== 1)
1158 flags
&= ~(BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID0
);
1159 if (num_devices
< 4)
1160 flags
&= ~BTRFS_BLOCK_GROUP_RAID10
;
1162 if ((flags
& BTRFS_BLOCK_GROUP_DUP
) &&
1163 (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
1164 BTRFS_BLOCK_GROUP_RAID10
))) {
1165 flags
&= ~BTRFS_BLOCK_GROUP_DUP
;
1168 if ((flags
& BTRFS_BLOCK_GROUP_RAID1
) &&
1169 (flags
& BTRFS_BLOCK_GROUP_RAID10
)) {
1170 flags
&= ~BTRFS_BLOCK_GROUP_RAID1
;
1173 if ((flags
& BTRFS_BLOCK_GROUP_RAID0
) &&
1174 ((flags
& BTRFS_BLOCK_GROUP_RAID1
) |
1175 (flags
& BTRFS_BLOCK_GROUP_RAID10
) |
1176 (flags
& BTRFS_BLOCK_GROUP_DUP
)))
1177 flags
&= ~BTRFS_BLOCK_GROUP_RAID0
;
1181 static int do_chunk_alloc(struct btrfs_trans_handle
*trans
,
1182 struct btrfs_root
*extent_root
, u64 alloc_bytes
,
1183 u64 flags
, int force
)
1185 struct btrfs_space_info
*space_info
;
1191 flags
= reduce_alloc_profile(extent_root
, flags
);
1193 space_info
= __find_space_info(extent_root
->fs_info
, flags
);
1195 ret
= update_space_info(extent_root
->fs_info
, flags
,
1199 BUG_ON(!space_info
);
1201 if (space_info
->force_alloc
) {
1203 space_info
->force_alloc
= 0;
1205 if (space_info
->full
)
1208 thresh
= div_factor(space_info
->total_bytes
, 6);
1210 (space_info
->bytes_used
+ space_info
->bytes_pinned
+ alloc_bytes
) <
1214 mutex_lock(&extent_root
->fs_info
->chunk_mutex
);
1215 ret
= btrfs_alloc_chunk(trans
, extent_root
, &start
, &num_bytes
, flags
);
1216 if (ret
== -ENOSPC
) {
1217 printk("space info full %Lu\n", flags
);
1218 space_info
->full
= 1;
1223 ret
= btrfs_make_block_group(trans
, extent_root
, 0, flags
,
1224 BTRFS_FIRST_CHUNK_TREE_OBJECTID
, start
, num_bytes
);
1227 mutex_unlock(&extent_root
->fs_info
->chunk_mutex
);
1232 static int update_block_group(struct btrfs_trans_handle
*trans
,
1233 struct btrfs_root
*root
,
1234 u64 bytenr
, u64 num_bytes
, int alloc
,
1237 struct btrfs_block_group_cache
*cache
;
1238 struct btrfs_fs_info
*info
= root
->fs_info
;
1239 u64 total
= num_bytes
;
1246 cache
= btrfs_lookup_block_group(info
, bytenr
);
1250 byte_in_group
= bytenr
- cache
->key
.objectid
;
1251 WARN_ON(byte_in_group
> cache
->key
.offset
);
1252 start
= cache
->key
.objectid
;
1253 end
= start
+ cache
->key
.offset
- 1;
1254 set_extent_bits(&info
->block_group_cache
, start
, end
,
1255 BLOCK_GROUP_DIRTY
, GFP_NOFS
);
1257 old_val
= btrfs_block_group_used(&cache
->item
);
1258 num_bytes
= min(total
, cache
->key
.offset
- byte_in_group
);
1260 old_val
+= num_bytes
;
1261 cache
->space_info
->bytes_used
+= num_bytes
;
1263 old_val
-= num_bytes
;
1264 cache
->space_info
->bytes_used
-= num_bytes
;
1266 set_extent_dirty(&info
->free_space_cache
,
1267 bytenr
, bytenr
+ num_bytes
- 1,
1271 btrfs_set_block_group_used(&cache
->item
, old_val
);
1273 bytenr
+= num_bytes
;
1278 static u64
first_logical_byte(struct btrfs_root
*root
, u64 search_start
)
1283 ret
= find_first_extent_bit(&root
->fs_info
->block_group_cache
,
1284 search_start
, &start
, &end
,
1285 BLOCK_GROUP_DATA
| BLOCK_GROUP_METADATA
|
1286 BLOCK_GROUP_SYSTEM
);
1293 static int update_pinned_extents(struct btrfs_root
*root
,
1294 u64 bytenr
, u64 num
, int pin
)
1297 struct btrfs_block_group_cache
*cache
;
1298 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1301 set_extent_dirty(&fs_info
->pinned_extents
,
1302 bytenr
, bytenr
+ num
- 1, GFP_NOFS
);
1304 clear_extent_dirty(&fs_info
->pinned_extents
,
1305 bytenr
, bytenr
+ num
- 1, GFP_NOFS
);
1308 cache
= btrfs_lookup_block_group(fs_info
, bytenr
);
1310 u64 first
= first_logical_byte(root
, bytenr
);
1311 WARN_ON(first
< bytenr
);
1312 len
= min(first
- bytenr
, num
);
1314 len
= min(num
, cache
->key
.offset
-
1315 (bytenr
- cache
->key
.objectid
));
1319 cache
->pinned
+= len
;
1320 cache
->space_info
->bytes_pinned
+= len
;
1322 fs_info
->total_pinned
+= len
;
1325 cache
->pinned
-= len
;
1326 cache
->space_info
->bytes_pinned
-= len
;
1328 fs_info
->total_pinned
-= len
;
1336 int btrfs_copy_pinned(struct btrfs_root
*root
, struct extent_io_tree
*copy
)
1341 struct extent_io_tree
*pinned_extents
= &root
->fs_info
->pinned_extents
;
1345 ret
= find_first_extent_bit(pinned_extents
, last
,
1346 &start
, &end
, EXTENT_DIRTY
);
1349 set_extent_dirty(copy
, start
, end
, GFP_NOFS
);
1355 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
1356 struct btrfs_root
*root
,
1357 struct extent_io_tree
*unpin
)
1362 struct extent_io_tree
*free_space_cache
;
1363 free_space_cache
= &root
->fs_info
->free_space_cache
;
1365 mutex_lock(&root
->fs_info
->alloc_mutex
);
1367 ret
= find_first_extent_bit(unpin
, 0, &start
, &end
,
1371 update_pinned_extents(root
, start
, end
+ 1 - start
, 0);
1372 clear_extent_dirty(unpin
, start
, end
, GFP_NOFS
);
1373 set_extent_dirty(free_space_cache
, start
, end
, GFP_NOFS
);
1375 mutex_unlock(&root
->fs_info
->alloc_mutex
);
1379 static int finish_current_insert(struct btrfs_trans_handle
*trans
,
1380 struct btrfs_root
*extent_root
)
1384 struct btrfs_fs_info
*info
= extent_root
->fs_info
;
1385 struct extent_buffer
*eb
;
1386 struct btrfs_path
*path
;
1387 struct btrfs_key ins
;
1388 struct btrfs_disk_key first
;
1389 struct btrfs_extent_item extent_item
;
1394 btrfs_set_stack_extent_refs(&extent_item
, 1);
1395 btrfs_set_key_type(&ins
, BTRFS_EXTENT_ITEM_KEY
);
1396 path
= btrfs_alloc_path();
1399 ret
= find_first_extent_bit(&info
->extent_ins
, 0, &start
,
1400 &end
, EXTENT_LOCKED
);
1404 ins
.objectid
= start
;
1405 ins
.offset
= end
+ 1 - start
;
1406 err
= btrfs_insert_item(trans
, extent_root
, &ins
,
1407 &extent_item
, sizeof(extent_item
));
1408 clear_extent_bits(&info
->extent_ins
, start
, end
, EXTENT_LOCKED
,
1410 eb
= read_tree_block(extent_root
, ins
.objectid
, ins
.offset
,
1412 btrfs_tree_lock(eb
);
1413 level
= btrfs_header_level(eb
);
1415 btrfs_item_key(eb
, &first
, 0);
1417 btrfs_node_key(eb
, &first
, 0);
1419 btrfs_tree_unlock(eb
);
1420 free_extent_buffer(eb
);
1422 * the first key is just a hint, so the race we've created
1423 * against reading it is fine
1425 err
= btrfs_insert_extent_backref(trans
, extent_root
, path
,
1426 start
, extent_root
->root_key
.objectid
,
1428 btrfs_disk_key_objectid(&first
));
1431 btrfs_free_path(path
);
1435 static int pin_down_bytes(struct btrfs_root
*root
, u64 bytenr
, u32 num_bytes
,
1441 struct extent_buffer
*buf
;
1442 buf
= btrfs_find_tree_block(root
, bytenr
, num_bytes
);
1444 if (!btrfs_try_tree_lock(buf
) &&
1445 btrfs_buffer_uptodate(buf
, 0)) {
1447 root
->fs_info
->running_transaction
->transid
;
1448 u64 header_transid
=
1449 btrfs_header_generation(buf
);
1450 if (header_transid
== transid
&&
1451 !btrfs_header_flag(buf
,
1452 BTRFS_HEADER_FLAG_WRITTEN
)) {
1453 clean_tree_block(NULL
, root
, buf
);
1454 btrfs_tree_unlock(buf
);
1455 free_extent_buffer(buf
);
1458 btrfs_tree_unlock(buf
);
1460 free_extent_buffer(buf
);
1462 update_pinned_extents(root
, bytenr
, num_bytes
, 1);
1464 set_extent_bits(&root
->fs_info
->pending_del
,
1465 bytenr
, bytenr
+ num_bytes
- 1,
1466 EXTENT_LOCKED
, GFP_NOFS
);
1473 * remove an extent from the root, returns 0 on success
1475 static int __free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
1476 *root
, u64 bytenr
, u64 num_bytes
,
1477 u64 root_objectid
, u64 ref_generation
,
1478 u64 owner_objectid
, u64 owner_offset
, int pin
,
1481 struct btrfs_path
*path
;
1482 struct btrfs_key key
;
1483 struct btrfs_fs_info
*info
= root
->fs_info
;
1484 struct btrfs_root
*extent_root
= info
->extent_root
;
1485 struct extent_buffer
*leaf
;
1487 int extent_slot
= 0;
1488 int found_extent
= 0;
1490 struct btrfs_extent_item
*ei
;
1493 key
.objectid
= bytenr
;
1494 btrfs_set_key_type(&key
, BTRFS_EXTENT_ITEM_KEY
);
1495 key
.offset
= num_bytes
;
1496 path
= btrfs_alloc_path();
1501 ret
= lookup_extent_backref(trans
, extent_root
, path
,
1502 bytenr
, root_objectid
,
1504 owner_objectid
, owner_offset
, 1);
1506 struct btrfs_key found_key
;
1507 extent_slot
= path
->slots
[0];
1508 while(extent_slot
> 0) {
1510 btrfs_item_key_to_cpu(path
->nodes
[0], &found_key
,
1512 if (found_key
.objectid
!= bytenr
)
1514 if (found_key
.type
== BTRFS_EXTENT_ITEM_KEY
&&
1515 found_key
.offset
== num_bytes
) {
1519 if (path
->slots
[0] - extent_slot
> 5)
1523 ret
= btrfs_del_item(trans
, extent_root
, path
);
1525 btrfs_print_leaf(extent_root
, path
->nodes
[0]);
1527 printk("Unable to find ref byte nr %Lu root %Lu "
1528 " gen %Lu owner %Lu offset %Lu\n", bytenr
,
1529 root_objectid
, ref_generation
, owner_objectid
,
1532 if (!found_extent
) {
1533 btrfs_release_path(extent_root
, path
);
1534 ret
= btrfs_search_slot(trans
, extent_root
, &key
, path
, -1, 1);
1538 extent_slot
= path
->slots
[0];
1541 leaf
= path
->nodes
[0];
1542 ei
= btrfs_item_ptr(leaf
, extent_slot
,
1543 struct btrfs_extent_item
);
1544 refs
= btrfs_extent_refs(leaf
, ei
);
1547 btrfs_set_extent_refs(leaf
, ei
, refs
);
1549 btrfs_mark_buffer_dirty(leaf
);
1551 if (refs
== 0 && found_extent
&& path
->slots
[0] == extent_slot
+ 1) {
1552 /* if the back ref and the extent are next to each other
1553 * they get deleted below in one shot
1555 path
->slots
[0] = extent_slot
;
1557 } else if (found_extent
) {
1558 /* otherwise delete the extent back ref */
1559 ret
= btrfs_del_item(trans
, extent_root
, path
);
1561 /* if refs are 0, we need to setup the path for deletion */
1563 btrfs_release_path(extent_root
, path
);
1564 ret
= btrfs_search_slot(trans
, extent_root
, &key
, path
,
1577 ret
= pin_down_bytes(root
, bytenr
, num_bytes
, 0);
1583 /* block accounting for super block */
1584 spin_lock_irq(&info
->delalloc_lock
);
1585 super_used
= btrfs_super_bytes_used(&info
->super_copy
);
1586 btrfs_set_super_bytes_used(&info
->super_copy
,
1587 super_used
- num_bytes
);
1588 spin_unlock_irq(&info
->delalloc_lock
);
1590 /* block accounting for root item */
1591 root_used
= btrfs_root_used(&root
->root_item
);
1592 btrfs_set_root_used(&root
->root_item
,
1593 root_used
- num_bytes
);
1594 ret
= btrfs_del_items(trans
, extent_root
, path
, path
->slots
[0],
1599 ret
= update_block_group(trans
, root
, bytenr
, num_bytes
, 0,
1603 btrfs_free_path(path
);
1604 finish_current_insert(trans
, extent_root
);
1609 * find all the blocks marked as pending in the radix tree and remove
1610 * them from the extent map
1612 static int del_pending_extents(struct btrfs_trans_handle
*trans
, struct
1613 btrfs_root
*extent_root
)
1619 struct extent_io_tree
*pending_del
;
1620 struct extent_io_tree
*pinned_extents
;
1622 pending_del
= &extent_root
->fs_info
->pending_del
;
1623 pinned_extents
= &extent_root
->fs_info
->pinned_extents
;
1626 ret
= find_first_extent_bit(pending_del
, 0, &start
, &end
,
1630 update_pinned_extents(extent_root
, start
, end
+ 1 - start
, 1);
1631 clear_extent_bits(pending_del
, start
, end
, EXTENT_LOCKED
,
1633 ret
= __free_extent(trans
, extent_root
,
1634 start
, end
+ 1 - start
,
1635 extent_root
->root_key
.objectid
,
1644 * remove an extent from the root, returns 0 on success
1646 static int __btrfs_free_extent(struct btrfs_trans_handle
*trans
,
1647 struct btrfs_root
*root
, u64 bytenr
,
1648 u64 num_bytes
, u64 root_objectid
,
1649 u64 ref_generation
, u64 owner_objectid
,
1650 u64 owner_offset
, int pin
)
1652 struct btrfs_root
*extent_root
= root
->fs_info
->extent_root
;
1656 WARN_ON(num_bytes
< root
->sectorsize
);
1657 if (!root
->ref_cows
)
1660 if (root
== extent_root
) {
1661 pin_down_bytes(root
, bytenr
, num_bytes
, 1);
1664 ret
= __free_extent(trans
, root
, bytenr
, num_bytes
, root_objectid
,
1665 ref_generation
, owner_objectid
, owner_offset
,
1667 pending_ret
= del_pending_extents(trans
, root
->fs_info
->extent_root
);
1668 return ret
? ret
: pending_ret
;
1671 int btrfs_free_extent(struct btrfs_trans_handle
*trans
,
1672 struct btrfs_root
*root
, u64 bytenr
,
1673 u64 num_bytes
, u64 root_objectid
,
1674 u64 ref_generation
, u64 owner_objectid
,
1675 u64 owner_offset
, int pin
)
1679 maybe_lock_mutex(root
);
1680 ret
= __btrfs_free_extent(trans
, root
, bytenr
, num_bytes
,
1681 root_objectid
, ref_generation
,
1682 owner_objectid
, owner_offset
, pin
);
1683 maybe_unlock_mutex(root
);
1687 static u64
stripe_align(struct btrfs_root
*root
, u64 val
)
1689 u64 mask
= ((u64
)root
->stripesize
- 1);
1690 u64 ret
= (val
+ mask
) & ~mask
;
1695 * walks the btree of allocated extents and find a hole of a given size.
1696 * The key ins is changed to record the hole:
1697 * ins->objectid == block start
1698 * ins->flags = BTRFS_EXTENT_ITEM_KEY
1699 * ins->offset == number of blocks
1700 * Any available blocks before search_start are skipped.
1702 static int noinline
find_free_extent(struct btrfs_trans_handle
*trans
,
1703 struct btrfs_root
*orig_root
,
1704 u64 num_bytes
, u64 empty_size
,
1705 u64 search_start
, u64 search_end
,
1706 u64 hint_byte
, struct btrfs_key
*ins
,
1707 u64 exclude_start
, u64 exclude_nr
,
1711 u64 orig_search_start
;
1712 struct btrfs_root
* root
= orig_root
->fs_info
->extent_root
;
1713 struct btrfs_fs_info
*info
= root
->fs_info
;
1714 u64 total_needed
= num_bytes
;
1715 u64
*last_ptr
= NULL
;
1716 struct btrfs_block_group_cache
*block_group
;
1719 int chunk_alloc_done
= 0;
1720 int empty_cluster
= 2 * 1024 * 1024;
1721 int allowed_chunk_alloc
= 0;
1723 WARN_ON(num_bytes
< root
->sectorsize
);
1724 btrfs_set_key_type(ins
, BTRFS_EXTENT_ITEM_KEY
);
1726 if (orig_root
->ref_cows
|| empty_size
)
1727 allowed_chunk_alloc
= 1;
1729 if (data
& BTRFS_BLOCK_GROUP_METADATA
) {
1730 last_ptr
= &root
->fs_info
->last_alloc
;
1731 empty_cluster
= 256 * 1024;
1734 if ((data
& BTRFS_BLOCK_GROUP_DATA
) && btrfs_test_opt(root
, SSD
)) {
1735 last_ptr
= &root
->fs_info
->last_data_alloc
;
1740 hint_byte
= *last_ptr
;
1742 empty_size
+= empty_cluster
;
1746 search_start
= max(search_start
, first_logical_byte(root
, 0));
1747 orig_search_start
= search_start
;
1749 if (search_end
== (u64
)-1)
1750 search_end
= btrfs_super_total_bytes(&info
->super_copy
);
1753 block_group
= btrfs_lookup_first_block_group(info
, hint_byte
);
1755 hint_byte
= search_start
;
1756 block_group
= __btrfs_find_block_group(root
, block_group
,
1757 hint_byte
, data
, 1);
1758 if (last_ptr
&& *last_ptr
== 0 && block_group
)
1759 hint_byte
= block_group
->key
.objectid
;
1761 block_group
= __btrfs_find_block_group(root
,
1763 search_start
, data
, 1);
1765 search_start
= max(search_start
, hint_byte
);
1767 total_needed
+= empty_size
;
1771 block_group
= btrfs_lookup_first_block_group(info
,
1774 block_group
= btrfs_lookup_first_block_group(info
,
1777 if (full_scan
&& !chunk_alloc_done
) {
1778 if (allowed_chunk_alloc
) {
1779 do_chunk_alloc(trans
, root
,
1780 num_bytes
+ 2 * 1024 * 1024, data
, 1);
1781 allowed_chunk_alloc
= 0;
1782 } else if (block_group
&& block_group_bits(block_group
, data
)) {
1783 block_group
->space_info
->force_alloc
= 1;
1785 chunk_alloc_done
= 1;
1787 ret
= find_search_start(root
, &block_group
, &search_start
,
1788 total_needed
, data
);
1789 if (ret
== -ENOSPC
&& last_ptr
&& *last_ptr
) {
1791 block_group
= btrfs_lookup_first_block_group(info
,
1793 search_start
= orig_search_start
;
1794 ret
= find_search_start(root
, &block_group
, &search_start
,
1795 total_needed
, data
);
1802 if (last_ptr
&& *last_ptr
&& search_start
!= *last_ptr
) {
1805 empty_size
+= empty_cluster
;
1806 total_needed
+= empty_size
;
1808 block_group
= btrfs_lookup_first_block_group(info
,
1810 search_start
= orig_search_start
;
1811 ret
= find_search_start(root
, &block_group
,
1812 &search_start
, total_needed
, data
);
1819 search_start
= stripe_align(root
, search_start
);
1820 ins
->objectid
= search_start
;
1821 ins
->offset
= num_bytes
;
1823 if (ins
->objectid
+ num_bytes
>= search_end
)
1826 if (ins
->objectid
+ num_bytes
>
1827 block_group
->key
.objectid
+ block_group
->key
.offset
) {
1828 search_start
= block_group
->key
.objectid
+
1829 block_group
->key
.offset
;
1833 if (test_range_bit(&info
->extent_ins
, ins
->objectid
,
1834 ins
->objectid
+ num_bytes
-1, EXTENT_LOCKED
, 0)) {
1835 search_start
= ins
->objectid
+ num_bytes
;
1839 if (test_range_bit(&info
->pinned_extents
, ins
->objectid
,
1840 ins
->objectid
+ num_bytes
-1, EXTENT_DIRTY
, 0)) {
1841 search_start
= ins
->objectid
+ num_bytes
;
1845 if (exclude_nr
> 0 && (ins
->objectid
+ num_bytes
> exclude_start
&&
1846 ins
->objectid
< exclude_start
+ exclude_nr
)) {
1847 search_start
= exclude_start
+ exclude_nr
;
1851 if (!(data
& BTRFS_BLOCK_GROUP_DATA
)) {
1852 block_group
= btrfs_lookup_block_group(info
, ins
->objectid
);
1854 trans
->block_group
= block_group
;
1856 ins
->offset
= num_bytes
;
1858 *last_ptr
= ins
->objectid
+ ins
->offset
;
1860 btrfs_super_total_bytes(&root
->fs_info
->super_copy
)) {
1867 if (search_start
+ num_bytes
>= search_end
) {
1869 search_start
= orig_search_start
;
1876 total_needed
-= empty_size
;
1881 block_group
= btrfs_lookup_first_block_group(info
, search_start
);
1883 block_group
= __btrfs_find_block_group(root
, block_group
,
1884 search_start
, data
, 0);
1892 * finds a free extent and does all the dirty work required for allocation
1893 * returns the key for the extent through ins, and a tree buffer for
1894 * the first block of the extent through buf.
1896 * returns 0 if everything worked, non-zero otherwise.
1898 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
1899 struct btrfs_root
*root
,
1900 u64 num_bytes
, u64 min_alloc_size
,
1901 u64 root_objectid
, u64 ref_generation
,
1902 u64 owner
, u64 owner_offset
,
1903 u64 empty_size
, u64 hint_byte
,
1904 u64 search_end
, struct btrfs_key
*ins
, u64 data
)
1910 u64 search_start
= 0;
1913 struct btrfs_fs_info
*info
= root
->fs_info
;
1914 struct btrfs_root
*extent_root
= info
->extent_root
;
1915 struct btrfs_extent_item
*extent_item
;
1916 struct btrfs_extent_ref
*ref
;
1917 struct btrfs_path
*path
;
1918 struct btrfs_key keys
[2];
1920 maybe_lock_mutex(root
);
1923 alloc_profile
= info
->avail_data_alloc_bits
&
1924 info
->data_alloc_profile
;
1925 data
= BTRFS_BLOCK_GROUP_DATA
| alloc_profile
;
1926 } else if (root
== root
->fs_info
->chunk_root
) {
1927 alloc_profile
= info
->avail_system_alloc_bits
&
1928 info
->system_alloc_profile
;
1929 data
= BTRFS_BLOCK_GROUP_SYSTEM
| alloc_profile
;
1931 alloc_profile
= info
->avail_metadata_alloc_bits
&
1932 info
->metadata_alloc_profile
;
1933 data
= BTRFS_BLOCK_GROUP_METADATA
| alloc_profile
;
1936 data
= reduce_alloc_profile(root
, data
);
1938 * the only place that sets empty_size is btrfs_realloc_node, which
1939 * is not called recursively on allocations
1941 if (empty_size
|| root
->ref_cows
) {
1942 if (!(data
& BTRFS_BLOCK_GROUP_METADATA
)) {
1943 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
1945 BTRFS_BLOCK_GROUP_METADATA
|
1946 (info
->metadata_alloc_profile
&
1947 info
->avail_metadata_alloc_bits
), 0);
1950 ret
= do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
1951 num_bytes
+ 2 * 1024 * 1024, data
, 0);
1955 WARN_ON(num_bytes
< root
->sectorsize
);
1956 ret
= find_free_extent(trans
, root
, num_bytes
, empty_size
,
1957 search_start
, search_end
, hint_byte
, ins
,
1958 trans
->alloc_exclude_start
,
1959 trans
->alloc_exclude_nr
, data
);
1961 if (ret
== -ENOSPC
&& num_bytes
> min_alloc_size
) {
1962 num_bytes
= num_bytes
>> 1;
1963 num_bytes
= max(num_bytes
, min_alloc_size
);
1964 do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
1965 num_bytes
, data
, 1);
1969 printk("allocation failed flags %Lu\n", data
);
1976 /* block accounting for super block */
1977 spin_lock_irq(&info
->delalloc_lock
);
1978 super_used
= btrfs_super_bytes_used(&info
->super_copy
);
1979 btrfs_set_super_bytes_used(&info
->super_copy
, super_used
+ num_bytes
);
1980 spin_unlock_irq(&info
->delalloc_lock
);
1982 /* block accounting for root item */
1983 root_used
= btrfs_root_used(&root
->root_item
);
1984 btrfs_set_root_used(&root
->root_item
, root_used
+ num_bytes
);
1986 clear_extent_dirty(&root
->fs_info
->free_space_cache
,
1987 ins
->objectid
, ins
->objectid
+ ins
->offset
- 1,
1990 if (root
== extent_root
) {
1991 set_extent_bits(&root
->fs_info
->extent_ins
, ins
->objectid
,
1992 ins
->objectid
+ ins
->offset
- 1,
1993 EXTENT_LOCKED
, GFP_NOFS
);
1997 WARN_ON(trans
->alloc_exclude_nr
);
1998 trans
->alloc_exclude_start
= ins
->objectid
;
1999 trans
->alloc_exclude_nr
= ins
->offset
;
2001 memcpy(&keys
[0], ins
, sizeof(*ins
));
2002 keys
[1].offset
= hash_extent_ref(root_objectid
, ref_generation
,
2003 owner
, owner_offset
);
2004 keys
[1].objectid
= ins
->objectid
;
2005 keys
[1].type
= BTRFS_EXTENT_REF_KEY
;
2006 sizes
[0] = sizeof(*extent_item
);
2007 sizes
[1] = sizeof(*ref
);
2009 path
= btrfs_alloc_path();
2012 ret
= btrfs_insert_empty_items(trans
, extent_root
, path
, keys
,
2016 extent_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
2017 struct btrfs_extent_item
);
2018 btrfs_set_extent_refs(path
->nodes
[0], extent_item
, 1);
2019 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
2020 struct btrfs_extent_ref
);
2022 btrfs_set_ref_root(path
->nodes
[0], ref
, root_objectid
);
2023 btrfs_set_ref_generation(path
->nodes
[0], ref
, ref_generation
);
2024 btrfs_set_ref_objectid(path
->nodes
[0], ref
, owner
);
2025 btrfs_set_ref_offset(path
->nodes
[0], ref
, owner_offset
);
2027 btrfs_mark_buffer_dirty(path
->nodes
[0]);
2029 trans
->alloc_exclude_start
= 0;
2030 trans
->alloc_exclude_nr
= 0;
2031 btrfs_free_path(path
);
2032 finish_current_insert(trans
, extent_root
);
2033 pending_ret
= del_pending_extents(trans
, extent_root
);
2043 ret
= update_block_group(trans
, root
, ins
->objectid
, ins
->offset
, 1, 0);
2045 printk("update block group failed for %Lu %Lu\n",
2046 ins
->objectid
, ins
->offset
);
2050 maybe_unlock_mutex(root
);
2054 * helper function to allocate a block for a given tree
2055 * returns the tree buffer or NULL.
2057 struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
2058 struct btrfs_root
*root
,
2067 struct btrfs_key ins
;
2069 struct extent_buffer
*buf
;
2071 ret
= btrfs_alloc_extent(trans
, root
, blocksize
, blocksize
,
2072 root_objectid
, ref_generation
,
2073 level
, first_objectid
, empty_size
, hint
,
2077 return ERR_PTR(ret
);
2079 buf
= btrfs_find_create_tree_block(root
, ins
.objectid
, blocksize
);
2081 btrfs_free_extent(trans
, root
, ins
.objectid
, blocksize
,
2082 root
->root_key
.objectid
, ref_generation
,
2084 return ERR_PTR(-ENOMEM
);
2086 btrfs_set_header_generation(buf
, trans
->transid
);
2087 btrfs_tree_lock(buf
);
2088 clean_tree_block(trans
, root
, buf
);
2089 btrfs_set_buffer_uptodate(buf
);
2091 if (PageDirty(buf
->first_page
)) {
2092 printk("page %lu dirty\n", buf
->first_page
->index
);
2096 set_extent_dirty(&trans
->transaction
->dirty_pages
, buf
->start
,
2097 buf
->start
+ buf
->len
- 1, GFP_NOFS
);
2098 trans
->blocks_used
++;
2102 static int noinline
drop_leaf_ref(struct btrfs_trans_handle
*trans
,
2103 struct btrfs_root
*root
,
2104 struct extent_buffer
*leaf
)
2107 u64 leaf_generation
;
2108 struct btrfs_key key
;
2109 struct btrfs_file_extent_item
*fi
;
2114 BUG_ON(!btrfs_is_leaf(leaf
));
2115 nritems
= btrfs_header_nritems(leaf
);
2116 leaf_owner
= btrfs_header_owner(leaf
);
2117 leaf_generation
= btrfs_header_generation(leaf
);
2119 for (i
= 0; i
< nritems
; i
++) {
2122 btrfs_item_key_to_cpu(leaf
, &key
, i
);
2123 if (btrfs_key_type(&key
) != BTRFS_EXTENT_DATA_KEY
)
2125 fi
= btrfs_item_ptr(leaf
, i
, struct btrfs_file_extent_item
);
2126 if (btrfs_file_extent_type(leaf
, fi
) ==
2127 BTRFS_FILE_EXTENT_INLINE
)
2130 * FIXME make sure to insert a trans record that
2131 * repeats the snapshot del on crash
2133 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
2134 if (disk_bytenr
== 0)
2136 ret
= __btrfs_free_extent(trans
, root
, disk_bytenr
,
2137 btrfs_file_extent_disk_num_bytes(leaf
, fi
),
2138 leaf_owner
, leaf_generation
,
2139 key
.objectid
, key
.offset
, 0);
2145 static void noinline
reada_walk_down(struct btrfs_root
*root
,
2146 struct extent_buffer
*node
,
2159 nritems
= btrfs_header_nritems(node
);
2160 level
= btrfs_header_level(node
);
2164 for (i
= slot
; i
< nritems
&& skipped
< 32; i
++) {
2165 bytenr
= btrfs_node_blockptr(node
, i
);
2166 if (last
&& ((bytenr
> last
&& bytenr
- last
> 32 * 1024) ||
2167 (last
> bytenr
&& last
- bytenr
> 32 * 1024))) {
2171 blocksize
= btrfs_level_size(root
, level
- 1);
2173 ret
= lookup_extent_ref(NULL
, root
, bytenr
,
2181 ret
= readahead_tree_block(root
, bytenr
, blocksize
,
2182 btrfs_node_ptr_generation(node
, i
));
2183 last
= bytenr
+ blocksize
;
2191 * we want to avoid as much random IO as we can with the alloc mutex
2192 * held, so drop the lock and do the lookup, then do it again with the
2195 int drop_snap_lookup_refcount(struct btrfs_root
*root
, u64 start
, u64 len
,
2198 mutex_unlock(&root
->fs_info
->alloc_mutex
);
2199 lookup_extent_ref(NULL
, root
, start
, len
, refs
);
2201 mutex_lock(&root
->fs_info
->alloc_mutex
);
2202 return lookup_extent_ref(NULL
, root
, start
, len
, refs
);
2206 * helper function for drop_snapshot, this walks down the tree dropping ref
2207 * counts as it goes.
2209 static int noinline
walk_down_tree(struct btrfs_trans_handle
*trans
,
2210 struct btrfs_root
*root
,
2211 struct btrfs_path
*path
, int *level
)
2217 struct extent_buffer
*next
;
2218 struct extent_buffer
*cur
;
2219 struct extent_buffer
*parent
;
2224 mutex_lock(&root
->fs_info
->alloc_mutex
);
2226 WARN_ON(*level
< 0);
2227 WARN_ON(*level
>= BTRFS_MAX_LEVEL
);
2228 ret
= drop_snap_lookup_refcount(root
, path
->nodes
[*level
]->start
,
2229 path
->nodes
[*level
]->len
, &refs
);
2235 * walk down to the last node level and free all the leaves
2237 while(*level
>= 0) {
2238 WARN_ON(*level
< 0);
2239 WARN_ON(*level
>= BTRFS_MAX_LEVEL
);
2240 cur
= path
->nodes
[*level
];
2242 if (btrfs_header_level(cur
) != *level
)
2245 if (path
->slots
[*level
] >=
2246 btrfs_header_nritems(cur
))
2249 ret
= drop_leaf_ref(trans
, root
, cur
);
2253 bytenr
= btrfs_node_blockptr(cur
, path
->slots
[*level
]);
2254 ptr_gen
= btrfs_node_ptr_generation(cur
, path
->slots
[*level
]);
2255 blocksize
= btrfs_level_size(root
, *level
- 1);
2257 ret
= drop_snap_lookup_refcount(root
, bytenr
, blocksize
, &refs
);
2260 parent
= path
->nodes
[*level
];
2261 root_owner
= btrfs_header_owner(parent
);
2262 root_gen
= btrfs_header_generation(parent
);
2263 path
->slots
[*level
]++;
2264 ret
= __btrfs_free_extent(trans
, root
, bytenr
,
2265 blocksize
, root_owner
,
2270 next
= btrfs_find_tree_block(root
, bytenr
, blocksize
);
2271 if (!next
|| !btrfs_buffer_uptodate(next
, ptr_gen
)) {
2272 free_extent_buffer(next
);
2273 mutex_unlock(&root
->fs_info
->alloc_mutex
);
2275 if (path
->slots
[*level
] == 0)
2276 reada_walk_down(root
, cur
, path
->slots
[*level
]);
2278 next
= read_tree_block(root
, bytenr
, blocksize
,
2281 mutex_lock(&root
->fs_info
->alloc_mutex
);
2283 /* we've dropped the lock, double check */
2284 ret
= drop_snap_lookup_refcount(root
, bytenr
,
2288 parent
= path
->nodes
[*level
];
2289 root_owner
= btrfs_header_owner(parent
);
2290 root_gen
= btrfs_header_generation(parent
);
2292 path
->slots
[*level
]++;
2293 free_extent_buffer(next
);
2294 ret
= __btrfs_free_extent(trans
, root
, bytenr
,
2302 WARN_ON(*level
<= 0);
2303 if (path
->nodes
[*level
-1])
2304 free_extent_buffer(path
->nodes
[*level
-1]);
2305 path
->nodes
[*level
-1] = next
;
2306 *level
= btrfs_header_level(next
);
2307 path
->slots
[*level
] = 0;
2310 WARN_ON(*level
< 0);
2311 WARN_ON(*level
>= BTRFS_MAX_LEVEL
);
2313 if (path
->nodes
[*level
] == root
->node
) {
2314 root_owner
= root
->root_key
.objectid
;
2315 parent
= path
->nodes
[*level
];
2317 parent
= path
->nodes
[*level
+ 1];
2318 root_owner
= btrfs_header_owner(parent
);
2321 root_gen
= btrfs_header_generation(parent
);
2322 ret
= __btrfs_free_extent(trans
, root
, path
->nodes
[*level
]->start
,
2323 path
->nodes
[*level
]->len
,
2324 root_owner
, root_gen
, 0, 0, 1);
2325 free_extent_buffer(path
->nodes
[*level
]);
2326 path
->nodes
[*level
] = NULL
;
2329 mutex_unlock(&root
->fs_info
->alloc_mutex
);
2335 * helper for dropping snapshots. This walks back up the tree in the path
2336 * to find the first node higher up where we haven't yet gone through
2339 static int noinline
walk_up_tree(struct btrfs_trans_handle
*trans
,
2340 struct btrfs_root
*root
,
2341 struct btrfs_path
*path
, int *level
)
2345 struct btrfs_root_item
*root_item
= &root
->root_item
;
2350 for(i
= *level
; i
< BTRFS_MAX_LEVEL
- 1 && path
->nodes
[i
]; i
++) {
2351 slot
= path
->slots
[i
];
2352 if (slot
< btrfs_header_nritems(path
->nodes
[i
]) - 1) {
2353 struct extent_buffer
*node
;
2354 struct btrfs_disk_key disk_key
;
2355 node
= path
->nodes
[i
];
2358 WARN_ON(*level
== 0);
2359 btrfs_node_key(node
, &disk_key
, path
->slots
[i
]);
2360 memcpy(&root_item
->drop_progress
,
2361 &disk_key
, sizeof(disk_key
));
2362 root_item
->drop_level
= i
;
2365 if (path
->nodes
[*level
] == root
->node
) {
2366 root_owner
= root
->root_key
.objectid
;
2368 btrfs_header_generation(path
->nodes
[*level
]);
2370 struct extent_buffer
*node
;
2371 node
= path
->nodes
[*level
+ 1];
2372 root_owner
= btrfs_header_owner(node
);
2373 root_gen
= btrfs_header_generation(node
);
2375 ret
= btrfs_free_extent(trans
, root
,
2376 path
->nodes
[*level
]->start
,
2377 path
->nodes
[*level
]->len
,
2378 root_owner
, root_gen
, 0, 0, 1);
2380 free_extent_buffer(path
->nodes
[*level
]);
2381 path
->nodes
[*level
] = NULL
;
2389 * drop the reference count on the tree rooted at 'snap'. This traverses
2390 * the tree freeing any blocks that have a ref count of zero after being
2393 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
2399 struct btrfs_path
*path
;
2402 struct btrfs_root_item
*root_item
= &root
->root_item
;
2404 WARN_ON(!mutex_is_locked(&root
->fs_info
->drop_mutex
));
2405 path
= btrfs_alloc_path();
2408 level
= btrfs_header_level(root
->node
);
2410 if (btrfs_disk_key_objectid(&root_item
->drop_progress
) == 0) {
2411 path
->nodes
[level
] = root
->node
;
2412 extent_buffer_get(root
->node
);
2413 path
->slots
[level
] = 0;
2415 struct btrfs_key key
;
2416 struct btrfs_disk_key found_key
;
2417 struct extent_buffer
*node
;
2419 btrfs_disk_key_to_cpu(&key
, &root_item
->drop_progress
);
2420 level
= root_item
->drop_level
;
2421 path
->lowest_level
= level
;
2422 wret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2427 node
= path
->nodes
[level
];
2428 btrfs_node_key(node
, &found_key
, path
->slots
[level
]);
2429 WARN_ON(memcmp(&found_key
, &root_item
->drop_progress
,
2430 sizeof(found_key
)));
2431 for (i
= 0; i
< BTRFS_MAX_LEVEL
; i
++) {
2432 if (path
->nodes
[i
] && path
->locks
[i
]) {
2434 btrfs_tree_unlock(path
->nodes
[i
]);
2439 wret
= walk_down_tree(trans
, root
, path
, &level
);
2445 wret
= walk_up_tree(trans
, root
, path
, &level
);
2450 if (trans
->transaction
->in_commit
) {
2455 for (i
= 0; i
<= orig_level
; i
++) {
2456 if (path
->nodes
[i
]) {
2457 free_extent_buffer(path
->nodes
[i
]);
2458 path
->nodes
[i
] = NULL
;
2462 btrfs_free_path(path
);
2466 int btrfs_free_block_groups(struct btrfs_fs_info
*info
)
2473 mutex_lock(&info
->alloc_mutex
);
2475 ret
= find_first_extent_bit(&info
->block_group_cache
, 0,
2476 &start
, &end
, (unsigned int)-1);
2479 ret
= get_state_private(&info
->block_group_cache
, start
, &ptr
);
2481 kfree((void *)(unsigned long)ptr
);
2482 clear_extent_bits(&info
->block_group_cache
, start
,
2483 end
, (unsigned int)-1, GFP_NOFS
);
2486 ret
= find_first_extent_bit(&info
->free_space_cache
, 0,
2487 &start
, &end
, EXTENT_DIRTY
);
2490 clear_extent_dirty(&info
->free_space_cache
, start
,
2493 mutex_unlock(&info
->alloc_mutex
);
2497 static unsigned long calc_ra(unsigned long start
, unsigned long last
,
2500 return min(last
, start
+ nr
- 1);
2503 static int noinline
relocate_inode_pages(struct inode
*inode
, u64 start
,
2508 unsigned long last_index
;
2511 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2512 struct file_ra_state
*ra
;
2513 unsigned long total_read
= 0;
2514 unsigned long ra_pages
;
2515 struct btrfs_trans_handle
*trans
;
2517 ra
= kzalloc(sizeof(*ra
), GFP_NOFS
);
2519 mutex_lock(&inode
->i_mutex
);
2520 i
= start
>> PAGE_CACHE_SHIFT
;
2521 last_index
= (start
+ len
- 1) >> PAGE_CACHE_SHIFT
;
2523 ra_pages
= BTRFS_I(inode
)->root
->fs_info
->bdi
.ra_pages
;
2525 file_ra_state_init(ra
, inode
->i_mapping
);
2527 for (; i
<= last_index
; i
++) {
2528 if (total_read
% ra_pages
== 0) {
2529 btrfs_force_ra(inode
->i_mapping
, ra
, NULL
, i
,
2530 calc_ra(i
, last_index
, ra_pages
));
2533 if (((u64
)i
<< PAGE_CACHE_SHIFT
) > inode
->i_size
)
2534 goto truncate_racing
;
2536 page
= grab_cache_page(inode
->i_mapping
, i
);
2540 if (!PageUptodate(page
)) {
2541 btrfs_readpage(NULL
, page
);
2543 if (!PageUptodate(page
)) {
2545 page_cache_release(page
);
2549 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2550 ClearPageDirty(page
);
2552 cancel_dirty_page(page
, PAGE_CACHE_SIZE
);
2554 wait_on_page_writeback(page
);
2555 set_page_extent_mapped(page
);
2556 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2557 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2559 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2561 set_extent_delalloc(io_tree
, page_start
,
2562 page_end
, GFP_NOFS
);
2563 set_page_dirty(page
);
2565 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2567 page_cache_release(page
);
2569 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
,
2574 trans
= btrfs_start_transaction(BTRFS_I(inode
)->root
, 1);
2576 btrfs_add_ordered_inode(inode
);
2577 btrfs_end_transaction(trans
, BTRFS_I(inode
)->root
);
2578 mark_inode_dirty(inode
);
2580 mutex_unlock(&inode
->i_mutex
);
2584 vmtruncate(inode
, inode
->i_size
);
2585 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
,
2591 * The back references tell us which tree holds a ref on a block,
2592 * but it is possible for the tree root field in the reference to
2593 * reflect the original root before a snapshot was made. In this
2594 * case we should search through all the children of a given root
2595 * to find potential holders of references on a block.
2597 * Instead, we do something a little less fancy and just search
2598 * all the roots for a given key/block combination.
2600 static int find_root_for_ref(struct btrfs_root
*root
,
2601 struct btrfs_path
*path
,
2602 struct btrfs_key
*key0
,
2605 struct btrfs_root
**found_root
,
2608 struct btrfs_key root_location
;
2609 struct btrfs_root
*cur_root
= *found_root
;
2610 struct btrfs_file_extent_item
*file_extent
;
2611 u64 root_search_start
= BTRFS_FS_TREE_OBJECTID
;
2616 root_location
.offset
= (u64
)-1;
2617 root_location
.type
= BTRFS_ROOT_ITEM_KEY
;
2618 path
->lowest_level
= level
;
2621 ret
= btrfs_search_slot(NULL
, cur_root
, key0
, path
, 0, 0);
2623 if (ret
== 0 && file_key
) {
2624 struct extent_buffer
*leaf
= path
->nodes
[0];
2625 file_extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
2626 struct btrfs_file_extent_item
);
2627 if (btrfs_file_extent_type(leaf
, file_extent
) ==
2628 BTRFS_FILE_EXTENT_REG
) {
2630 btrfs_file_extent_disk_bytenr(leaf
,
2633 } else if (!file_key
) {
2634 if (path
->nodes
[level
])
2635 found_bytenr
= path
->nodes
[level
]->start
;
2638 for (i
= level
; i
< BTRFS_MAX_LEVEL
; i
++) {
2639 if (!path
->nodes
[i
])
2641 free_extent_buffer(path
->nodes
[i
]);
2642 path
->nodes
[i
] = NULL
;
2644 btrfs_release_path(cur_root
, path
);
2646 if (found_bytenr
== bytenr
) {
2647 *found_root
= cur_root
;
2651 ret
= btrfs_search_root(root
->fs_info
->tree_root
,
2652 root_search_start
, &root_search_start
);
2656 root_location
.objectid
= root_search_start
;
2657 cur_root
= btrfs_read_fs_root_no_name(root
->fs_info
,
2665 path
->lowest_level
= 0;
2670 * note, this releases the path
2672 static int noinline
relocate_one_reference(struct btrfs_root
*extent_root
,
2673 struct btrfs_path
*path
,
2674 struct btrfs_key
*extent_key
,
2675 u64
*last_file_objectid
,
2676 u64
*last_file_offset
,
2677 u64
*last_file_root
,
2680 struct inode
*inode
;
2681 struct btrfs_root
*found_root
;
2682 struct btrfs_key root_location
;
2683 struct btrfs_key found_key
;
2684 struct btrfs_extent_ref
*ref
;
2692 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
2693 struct btrfs_extent_ref
);
2694 ref_root
= btrfs_ref_root(path
->nodes
[0], ref
);
2695 ref_gen
= btrfs_ref_generation(path
->nodes
[0], ref
);
2696 ref_objectid
= btrfs_ref_objectid(path
->nodes
[0], ref
);
2697 ref_offset
= btrfs_ref_offset(path
->nodes
[0], ref
);
2698 btrfs_release_path(extent_root
, path
);
2700 root_location
.objectid
= ref_root
;
2702 root_location
.offset
= 0;
2704 root_location
.offset
= (u64
)-1;
2705 root_location
.type
= BTRFS_ROOT_ITEM_KEY
;
2707 found_root
= btrfs_read_fs_root_no_name(extent_root
->fs_info
,
2709 BUG_ON(!found_root
);
2711 if (ref_objectid
>= BTRFS_FIRST_FREE_OBJECTID
) {
2712 found_key
.objectid
= ref_objectid
;
2713 found_key
.type
= BTRFS_EXTENT_DATA_KEY
;
2714 found_key
.offset
= ref_offset
;
2717 if (last_extent
== extent_key
->objectid
&&
2718 *last_file_objectid
== ref_objectid
&&
2719 *last_file_offset
== ref_offset
&&
2720 *last_file_root
== ref_root
)
2723 ret
= find_root_for_ref(extent_root
, path
, &found_key
,
2724 level
, 1, &found_root
,
2725 extent_key
->objectid
);
2730 if (last_extent
== extent_key
->objectid
&&
2731 *last_file_objectid
== ref_objectid
&&
2732 *last_file_offset
== ref_offset
&&
2733 *last_file_root
== ref_root
)
2736 inode
= btrfs_iget_locked(extent_root
->fs_info
->sb
,
2737 ref_objectid
, found_root
);
2738 if (inode
->i_state
& I_NEW
) {
2739 /* the inode and parent dir are two different roots */
2740 BTRFS_I(inode
)->root
= found_root
;
2741 BTRFS_I(inode
)->location
.objectid
= ref_objectid
;
2742 BTRFS_I(inode
)->location
.type
= BTRFS_INODE_ITEM_KEY
;
2743 BTRFS_I(inode
)->location
.offset
= 0;
2744 btrfs_read_locked_inode(inode
);
2745 unlock_new_inode(inode
);
2748 /* this can happen if the reference is not against
2749 * the latest version of the tree root
2751 if (is_bad_inode(inode
)) {
2754 *last_file_objectid
= inode
->i_ino
;
2755 *last_file_root
= found_root
->root_key
.objectid
;
2756 *last_file_offset
= ref_offset
;
2758 relocate_inode_pages(inode
, ref_offset
, extent_key
->offset
);
2761 struct btrfs_trans_handle
*trans
;
2762 struct extent_buffer
*eb
;
2765 eb
= read_tree_block(found_root
, extent_key
->objectid
,
2766 extent_key
->offset
, 0);
2767 btrfs_tree_lock(eb
);
2768 level
= btrfs_header_level(eb
);
2771 btrfs_item_key_to_cpu(eb
, &found_key
, 0);
2773 btrfs_node_key_to_cpu(eb
, &found_key
, 0);
2775 btrfs_tree_unlock(eb
);
2776 free_extent_buffer(eb
);
2778 ret
= find_root_for_ref(extent_root
, path
, &found_key
,
2779 level
, 0, &found_root
,
2780 extent_key
->objectid
);
2785 trans
= btrfs_start_transaction(found_root
, 1);
2787 path
->lowest_level
= level
;
2789 ret
= btrfs_search_slot(trans
, found_root
, &found_key
, path
,
2791 path
->lowest_level
= 0;
2792 for (i
= level
; i
< BTRFS_MAX_LEVEL
; i
++) {
2793 if (!path
->nodes
[i
])
2795 free_extent_buffer(path
->nodes
[i
]);
2796 path
->nodes
[i
] = NULL
;
2798 btrfs_release_path(found_root
, path
);
2799 if (found_root
== found_root
->fs_info
->extent_root
)
2800 btrfs_extent_post_op(trans
, found_root
);
2801 btrfs_end_transaction(trans
, found_root
);
2808 static int noinline
del_extent_zero(struct btrfs_root
*extent_root
,
2809 struct btrfs_path
*path
,
2810 struct btrfs_key
*extent_key
)
2813 struct btrfs_trans_handle
*trans
;
2815 trans
= btrfs_start_transaction(extent_root
, 1);
2816 ret
= btrfs_search_slot(trans
, extent_root
, extent_key
, path
, -1, 1);
2823 ret
= btrfs_del_item(trans
, extent_root
, path
);
2825 btrfs_end_transaction(trans
, extent_root
);
2829 static int noinline
relocate_one_extent(struct btrfs_root
*extent_root
,
2830 struct btrfs_path
*path
,
2831 struct btrfs_key
*extent_key
)
2833 struct btrfs_key key
;
2834 struct btrfs_key found_key
;
2835 struct extent_buffer
*leaf
;
2836 u64 last_file_objectid
= 0;
2837 u64 last_file_root
= 0;
2838 u64 last_file_offset
= (u64
)-1;
2839 u64 last_extent
= 0;
2844 if (extent_key
->objectid
== 0) {
2845 ret
= del_extent_zero(extent_root
, path
, extent_key
);
2848 key
.objectid
= extent_key
->objectid
;
2849 key
.type
= BTRFS_EXTENT_REF_KEY
;
2853 ret
= btrfs_search_slot(NULL
, extent_root
, &key
, path
, 0, 0);
2859 leaf
= path
->nodes
[0];
2860 nritems
= btrfs_header_nritems(leaf
);
2861 if (path
->slots
[0] == nritems
) {
2862 ret
= btrfs_next_leaf(extent_root
, path
);
2869 leaf
= path
->nodes
[0];
2872 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2873 if (found_key
.objectid
!= extent_key
->objectid
) {
2877 if (found_key
.type
!= BTRFS_EXTENT_REF_KEY
) {
2881 key
.offset
= found_key
.offset
+ 1;
2882 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
2884 ret
= relocate_one_reference(extent_root
, path
, extent_key
,
2885 &last_file_objectid
,
2887 &last_file_root
, last_extent
);
2890 last_extent
= extent_key
->objectid
;
2894 btrfs_release_path(extent_root
, path
);
2898 static u64
update_block_group_flags(struct btrfs_root
*root
, u64 flags
)
2901 u64 stripped
= BTRFS_BLOCK_GROUP_RAID0
|
2902 BTRFS_BLOCK_GROUP_RAID1
| BTRFS_BLOCK_GROUP_RAID10
;
2904 num_devices
= root
->fs_info
->fs_devices
->num_devices
;
2905 if (num_devices
== 1) {
2906 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
2907 stripped
= flags
& ~stripped
;
2909 /* turn raid0 into single device chunks */
2910 if (flags
& BTRFS_BLOCK_GROUP_RAID0
)
2913 /* turn mirroring into duplication */
2914 if (flags
& (BTRFS_BLOCK_GROUP_RAID1
|
2915 BTRFS_BLOCK_GROUP_RAID10
))
2916 return stripped
| BTRFS_BLOCK_GROUP_DUP
;
2919 /* they already had raid on here, just return */
2920 if (flags
& stripped
)
2923 stripped
|= BTRFS_BLOCK_GROUP_DUP
;
2924 stripped
= flags
& ~stripped
;
2926 /* switch duplicated blocks with raid1 */
2927 if (flags
& BTRFS_BLOCK_GROUP_DUP
)
2928 return stripped
| BTRFS_BLOCK_GROUP_RAID1
;
2930 /* turn single device chunks into raid0 */
2931 return stripped
| BTRFS_BLOCK_GROUP_RAID0
;
2936 int __alloc_chunk_for_shrink(struct btrfs_root
*root
,
2937 struct btrfs_block_group_cache
*shrink_block_group
,
2940 struct btrfs_trans_handle
*trans
;
2941 u64 new_alloc_flags
;
2944 if (btrfs_block_group_used(&shrink_block_group
->item
) > 0) {
2946 trans
= btrfs_start_transaction(root
, 1);
2947 new_alloc_flags
= update_block_group_flags(root
,
2948 shrink_block_group
->flags
);
2949 if (new_alloc_flags
!= shrink_block_group
->flags
) {
2951 btrfs_block_group_used(&shrink_block_group
->item
);
2953 calc
= shrink_block_group
->key
.offset
;
2955 do_chunk_alloc(trans
, root
->fs_info
->extent_root
,
2956 calc
+ 2 * 1024 * 1024, new_alloc_flags
, force
);
2957 btrfs_end_transaction(trans
, root
);
2962 int btrfs_shrink_extent_tree(struct btrfs_root
*root
, u64 shrink_start
)
2964 struct btrfs_trans_handle
*trans
;
2965 struct btrfs_root
*tree_root
= root
->fs_info
->tree_root
;
2966 struct btrfs_path
*path
;
2969 u64 shrink_last_byte
;
2970 struct btrfs_block_group_cache
*shrink_block_group
;
2971 struct btrfs_fs_info
*info
= root
->fs_info
;
2972 struct btrfs_key key
;
2973 struct btrfs_key found_key
;
2974 struct extent_buffer
*leaf
;
2979 mutex_lock(&root
->fs_info
->alloc_mutex
);
2980 shrink_block_group
= btrfs_lookup_block_group(root
->fs_info
,
2982 BUG_ON(!shrink_block_group
);
2984 shrink_last_byte
= shrink_block_group
->key
.objectid
+
2985 shrink_block_group
->key
.offset
;
2987 shrink_block_group
->space_info
->total_bytes
-=
2988 shrink_block_group
->key
.offset
;
2989 path
= btrfs_alloc_path();
2990 root
= root
->fs_info
->extent_root
;
2993 printk("btrfs relocating block group %llu flags %llu\n",
2994 (unsigned long long)shrink_start
,
2995 (unsigned long long)shrink_block_group
->flags
);
2997 __alloc_chunk_for_shrink(root
, shrink_block_group
, 1);
3001 shrink_block_group
->ro
= 1;
3005 key
.objectid
= shrink_start
;
3008 cur_byte
= key
.objectid
;
3010 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3014 ret
= btrfs_previous_item(root
, path
, 0, BTRFS_EXTENT_ITEM_KEY
);
3019 leaf
= path
->nodes
[0];
3020 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3021 if (found_key
.objectid
+ found_key
.offset
> shrink_start
&&
3022 found_key
.objectid
< shrink_last_byte
) {
3023 cur_byte
= found_key
.objectid
;
3024 key
.objectid
= cur_byte
;
3027 btrfs_release_path(root
, path
);
3030 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3034 leaf
= path
->nodes
[0];
3035 nritems
= btrfs_header_nritems(leaf
);
3037 if (path
->slots
[0] >= nritems
) {
3038 ret
= btrfs_next_leaf(root
, path
);
3045 leaf
= path
->nodes
[0];
3046 nritems
= btrfs_header_nritems(leaf
);
3049 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3051 if (found_key
.objectid
>= shrink_last_byte
)
3054 if (progress
&& need_resched()) {
3055 memcpy(&key
, &found_key
, sizeof(key
));
3057 btrfs_release_path(root
, path
);
3058 btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3064 if (btrfs_key_type(&found_key
) != BTRFS_EXTENT_ITEM_KEY
||
3065 found_key
.objectid
+ found_key
.offset
<= cur_byte
) {
3066 memcpy(&key
, &found_key
, sizeof(key
));
3073 cur_byte
= found_key
.objectid
+ found_key
.offset
;
3074 key
.objectid
= cur_byte
;
3075 btrfs_release_path(root
, path
);
3076 ret
= relocate_one_extent(root
, path
, &found_key
);
3077 __alloc_chunk_for_shrink(root
, shrink_block_group
, 0);
3080 btrfs_release_path(root
, path
);
3082 if (total_found
> 0) {
3083 printk("btrfs relocate found %llu last extent was %llu\n",
3084 (unsigned long long)total_found
,
3085 (unsigned long long)found_key
.objectid
);
3086 trans
= btrfs_start_transaction(tree_root
, 1);
3087 btrfs_commit_transaction(trans
, tree_root
);
3089 btrfs_clean_old_snapshots(tree_root
);
3091 trans
= btrfs_start_transaction(tree_root
, 1);
3092 btrfs_commit_transaction(trans
, tree_root
);
3097 * we've freed all the extents, now remove the block
3098 * group item from the tree
3100 trans
= btrfs_start_transaction(root
, 1);
3101 memcpy(&key
, &shrink_block_group
->key
, sizeof(key
));
3103 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
3109 clear_extent_bits(&info
->block_group_cache
, key
.objectid
,
3110 key
.objectid
+ key
.offset
- 1,
3111 (unsigned int)-1, GFP_NOFS
);
3114 clear_extent_bits(&info
->free_space_cache
,
3115 key
.objectid
, key
.objectid
+ key
.offset
- 1,
3116 (unsigned int)-1, GFP_NOFS
);
3118 memset(shrink_block_group
, 0, sizeof(*shrink_block_group
));
3119 kfree(shrink_block_group
);
3121 btrfs_del_item(trans
, root
, path
);
3122 btrfs_commit_transaction(trans
, root
);
3124 /* the code to unpin extents might set a few bits in the free
3125 * space cache for this range again
3127 clear_extent_bits(&info
->free_space_cache
,
3128 key
.objectid
, key
.objectid
+ key
.offset
- 1,
3129 (unsigned int)-1, GFP_NOFS
);
3131 btrfs_free_path(path
);
3132 mutex_unlock(&root
->fs_info
->alloc_mutex
);
3136 int find_first_block_group(struct btrfs_root
*root
, struct btrfs_path
*path
,
3137 struct btrfs_key
*key
)
3140 struct btrfs_key found_key
;
3141 struct extent_buffer
*leaf
;
3144 ret
= btrfs_search_slot(NULL
, root
, key
, path
, 0, 0);
3149 slot
= path
->slots
[0];
3150 leaf
= path
->nodes
[0];
3151 if (slot
>= btrfs_header_nritems(leaf
)) {
3152 ret
= btrfs_next_leaf(root
, path
);
3159 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
3161 if (found_key
.objectid
>= key
->objectid
&&
3162 found_key
.type
== BTRFS_BLOCK_GROUP_ITEM_KEY
) {
3173 int btrfs_read_block_groups(struct btrfs_root
*root
)
3175 struct btrfs_path
*path
;
3178 struct btrfs_block_group_cache
*cache
;
3179 struct btrfs_fs_info
*info
= root
->fs_info
;
3180 struct btrfs_space_info
*space_info
;
3181 struct extent_io_tree
*block_group_cache
;
3182 struct btrfs_key key
;
3183 struct btrfs_key found_key
;
3184 struct extent_buffer
*leaf
;
3186 block_group_cache
= &info
->block_group_cache
;
3187 root
= info
->extent_root
;
3190 btrfs_set_key_type(&key
, BTRFS_BLOCK_GROUP_ITEM_KEY
);
3191 path
= btrfs_alloc_path();
3195 mutex_lock(&root
->fs_info
->alloc_mutex
);
3197 ret
= find_first_block_group(root
, path
, &key
);
3205 leaf
= path
->nodes
[0];
3206 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3207 cache
= kzalloc(sizeof(*cache
), GFP_NOFS
);
3213 read_extent_buffer(leaf
, &cache
->item
,
3214 btrfs_item_ptr_offset(leaf
, path
->slots
[0]),
3215 sizeof(cache
->item
));
3216 memcpy(&cache
->key
, &found_key
, sizeof(found_key
));
3218 key
.objectid
= found_key
.objectid
+ found_key
.offset
;
3219 btrfs_release_path(root
, path
);
3220 cache
->flags
= btrfs_block_group_flags(&cache
->item
);
3222 if (cache
->flags
& BTRFS_BLOCK_GROUP_DATA
) {
3223 bit
= BLOCK_GROUP_DATA
;
3224 } else if (cache
->flags
& BTRFS_BLOCK_GROUP_SYSTEM
) {
3225 bit
= BLOCK_GROUP_SYSTEM
;
3226 } else if (cache
->flags
& BTRFS_BLOCK_GROUP_METADATA
) {
3227 bit
= BLOCK_GROUP_METADATA
;
3229 set_avail_alloc_bits(info
, cache
->flags
);
3231 ret
= update_space_info(info
, cache
->flags
, found_key
.offset
,
3232 btrfs_block_group_used(&cache
->item
),
3235 cache
->space_info
= space_info
;
3237 /* use EXTENT_LOCKED to prevent merging */
3238 set_extent_bits(block_group_cache
, found_key
.objectid
,
3239 found_key
.objectid
+ found_key
.offset
- 1,
3240 bit
| EXTENT_LOCKED
, GFP_NOFS
);
3241 set_state_private(block_group_cache
, found_key
.objectid
,
3242 (unsigned long)cache
);
3245 btrfs_super_total_bytes(&info
->super_copy
))
3250 btrfs_free_path(path
);
3251 mutex_unlock(&root
->fs_info
->alloc_mutex
);
3255 int btrfs_make_block_group(struct btrfs_trans_handle
*trans
,
3256 struct btrfs_root
*root
, u64 bytes_used
,
3257 u64 type
, u64 chunk_objectid
, u64 chunk_offset
,
3262 struct btrfs_root
*extent_root
;
3263 struct btrfs_block_group_cache
*cache
;
3264 struct extent_io_tree
*block_group_cache
;
3266 extent_root
= root
->fs_info
->extent_root
;
3267 block_group_cache
= &root
->fs_info
->block_group_cache
;
3269 cache
= kzalloc(sizeof(*cache
), GFP_NOFS
);
3271 cache
->key
.objectid
= chunk_offset
;
3272 cache
->key
.offset
= size
;
3273 btrfs_set_key_type(&cache
->key
, BTRFS_BLOCK_GROUP_ITEM_KEY
);
3275 btrfs_set_block_group_used(&cache
->item
, bytes_used
);
3276 btrfs_set_block_group_chunk_objectid(&cache
->item
, chunk_objectid
);
3277 cache
->flags
= type
;
3278 btrfs_set_block_group_flags(&cache
->item
, type
);
3280 ret
= update_space_info(root
->fs_info
, cache
->flags
, size
, bytes_used
,
3281 &cache
->space_info
);
3284 bit
= block_group_state_bits(type
);
3285 set_extent_bits(block_group_cache
, chunk_offset
,
3286 chunk_offset
+ size
- 1,
3287 bit
| EXTENT_LOCKED
, GFP_NOFS
);
3289 set_state_private(block_group_cache
, chunk_offset
,
3290 (unsigned long)cache
);
3291 ret
= btrfs_insert_item(trans
, extent_root
, &cache
->key
, &cache
->item
,
3292 sizeof(cache
->item
));
3295 finish_current_insert(trans
, extent_root
);
3296 ret
= del_pending_extents(trans
, extent_root
);
3298 set_avail_alloc_bits(extent_root
->fs_info
, type
);