2 * Copyright (C) 2008 Red Hat. 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.
19 #include <linux/pagemap.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/math64.h>
23 #include <linux/ratelimit.h>
25 #include "free-space-cache.h"
26 #include "transaction.h"
28 #include "extent_io.h"
29 #include "inode-map.h"
32 #define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8)
33 #define MAX_CACHE_BYTES_PER_GIG (32 * 1024)
35 struct btrfs_trim_range
{
38 struct list_head list
;
41 static int link_free_space(struct btrfs_free_space_ctl
*ctl
,
42 struct btrfs_free_space
*info
);
43 static void unlink_free_space(struct btrfs_free_space_ctl
*ctl
,
44 struct btrfs_free_space
*info
);
46 static struct inode
*__lookup_free_space_inode(struct btrfs_root
*root
,
47 struct btrfs_path
*path
,
51 struct btrfs_key location
;
52 struct btrfs_disk_key disk_key
;
53 struct btrfs_free_space_header
*header
;
54 struct extent_buffer
*leaf
;
55 struct inode
*inode
= NULL
;
58 key
.objectid
= BTRFS_FREE_SPACE_OBJECTID
;
62 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
66 btrfs_release_path(path
);
67 return ERR_PTR(-ENOENT
);
70 leaf
= path
->nodes
[0];
71 header
= btrfs_item_ptr(leaf
, path
->slots
[0],
72 struct btrfs_free_space_header
);
73 btrfs_free_space_key(leaf
, header
, &disk_key
);
74 btrfs_disk_key_to_cpu(&location
, &disk_key
);
75 btrfs_release_path(path
);
77 inode
= btrfs_iget(root
->fs_info
->sb
, &location
, root
, NULL
);
79 return ERR_PTR(-ENOENT
);
82 if (is_bad_inode(inode
)) {
84 return ERR_PTR(-ENOENT
);
87 mapping_set_gfp_mask(inode
->i_mapping
,
88 mapping_gfp_mask(inode
->i_mapping
) & ~__GFP_FS
);
93 struct inode
*lookup_free_space_inode(struct btrfs_root
*root
,
94 struct btrfs_block_group_cache
95 *block_group
, struct btrfs_path
*path
)
97 struct inode
*inode
= NULL
;
98 u32 flags
= BTRFS_INODE_NODATASUM
| BTRFS_INODE_NODATACOW
;
100 spin_lock(&block_group
->lock
);
101 if (block_group
->inode
)
102 inode
= igrab(block_group
->inode
);
103 spin_unlock(&block_group
->lock
);
107 inode
= __lookup_free_space_inode(root
, path
,
108 block_group
->key
.objectid
);
112 spin_lock(&block_group
->lock
);
113 if (!((BTRFS_I(inode
)->flags
& flags
) == flags
)) {
114 btrfs_info(root
->fs_info
,
115 "Old style space inode found, converting.");
116 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
|
117 BTRFS_INODE_NODATACOW
;
118 block_group
->disk_cache_state
= BTRFS_DC_CLEAR
;
121 if (!block_group
->iref
) {
122 block_group
->inode
= igrab(inode
);
123 block_group
->iref
= 1;
125 spin_unlock(&block_group
->lock
);
130 static int __create_free_space_inode(struct btrfs_root
*root
,
131 struct btrfs_trans_handle
*trans
,
132 struct btrfs_path
*path
,
135 struct btrfs_key key
;
136 struct btrfs_disk_key disk_key
;
137 struct btrfs_free_space_header
*header
;
138 struct btrfs_inode_item
*inode_item
;
139 struct extent_buffer
*leaf
;
140 u64 flags
= BTRFS_INODE_NOCOMPRESS
| BTRFS_INODE_PREALLOC
;
143 ret
= btrfs_insert_empty_inode(trans
, root
, path
, ino
);
147 /* We inline crc's for the free disk space cache */
148 if (ino
!= BTRFS_FREE_INO_OBJECTID
)
149 flags
|= BTRFS_INODE_NODATASUM
| BTRFS_INODE_NODATACOW
;
151 leaf
= path
->nodes
[0];
152 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
153 struct btrfs_inode_item
);
154 btrfs_item_key(leaf
, &disk_key
, path
->slots
[0]);
155 memset_extent_buffer(leaf
, 0, (unsigned long)inode_item
,
156 sizeof(*inode_item
));
157 btrfs_set_inode_generation(leaf
, inode_item
, trans
->transid
);
158 btrfs_set_inode_size(leaf
, inode_item
, 0);
159 btrfs_set_inode_nbytes(leaf
, inode_item
, 0);
160 btrfs_set_inode_uid(leaf
, inode_item
, 0);
161 btrfs_set_inode_gid(leaf
, inode_item
, 0);
162 btrfs_set_inode_mode(leaf
, inode_item
, S_IFREG
| 0600);
163 btrfs_set_inode_flags(leaf
, inode_item
, flags
);
164 btrfs_set_inode_nlink(leaf
, inode_item
, 1);
165 btrfs_set_inode_transid(leaf
, inode_item
, trans
->transid
);
166 btrfs_set_inode_block_group(leaf
, inode_item
, offset
);
167 btrfs_mark_buffer_dirty(leaf
);
168 btrfs_release_path(path
);
170 key
.objectid
= BTRFS_FREE_SPACE_OBJECTID
;
174 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
175 sizeof(struct btrfs_free_space_header
));
177 btrfs_release_path(path
);
180 leaf
= path
->nodes
[0];
181 header
= btrfs_item_ptr(leaf
, path
->slots
[0],
182 struct btrfs_free_space_header
);
183 memset_extent_buffer(leaf
, 0, (unsigned long)header
, sizeof(*header
));
184 btrfs_set_free_space_key(leaf
, header
, &disk_key
);
185 btrfs_mark_buffer_dirty(leaf
);
186 btrfs_release_path(path
);
191 int create_free_space_inode(struct btrfs_root
*root
,
192 struct btrfs_trans_handle
*trans
,
193 struct btrfs_block_group_cache
*block_group
,
194 struct btrfs_path
*path
)
199 ret
= btrfs_find_free_objectid(root
, &ino
);
203 return __create_free_space_inode(root
, trans
, path
, ino
,
204 block_group
->key
.objectid
);
207 int btrfs_check_trunc_cache_free_space(struct btrfs_root
*root
,
208 struct btrfs_block_rsv
*rsv
)
213 /* 1 for slack space, 1 for updating the inode */
214 needed_bytes
= btrfs_calc_trunc_metadata_size(root
, 1) +
215 btrfs_calc_trans_metadata_size(root
, 1);
217 spin_lock(&rsv
->lock
);
218 if (rsv
->reserved
< needed_bytes
)
222 spin_unlock(&rsv
->lock
);
226 int btrfs_truncate_free_space_cache(struct btrfs_root
*root
,
227 struct btrfs_trans_handle
*trans
,
232 btrfs_i_size_write(inode
, 0);
233 truncate_pagecache(inode
, 0);
236 * We don't need an orphan item because truncating the free space cache
237 * will never be split across transactions.
239 ret
= btrfs_truncate_inode_items(trans
, root
, inode
,
240 0, BTRFS_EXTENT_DATA_KEY
);
242 btrfs_abort_transaction(trans
, root
, ret
);
246 ret
= btrfs_update_inode(trans
, root
, inode
);
248 btrfs_abort_transaction(trans
, root
, ret
);
253 static int readahead_cache(struct inode
*inode
)
255 struct file_ra_state
*ra
;
256 unsigned long last_index
;
258 ra
= kzalloc(sizeof(*ra
), GFP_NOFS
);
262 file_ra_state_init(ra
, inode
->i_mapping
);
263 last_index
= (i_size_read(inode
) - 1) >> PAGE_CACHE_SHIFT
;
265 page_cache_sync_readahead(inode
->i_mapping
, ra
, NULL
, 0, last_index
);
276 struct btrfs_root
*root
;
280 unsigned check_crcs
:1;
283 static int io_ctl_init(struct io_ctl
*io_ctl
, struct inode
*inode
,
284 struct btrfs_root
*root
, int write
)
289 num_pages
= DIV_ROUND_UP(i_size_read(inode
), PAGE_CACHE_SIZE
);
291 if (btrfs_ino(inode
) != BTRFS_FREE_INO_OBJECTID
)
294 /* Make sure we can fit our crcs into the first page */
295 if (write
&& check_crcs
&&
296 (num_pages
* sizeof(u32
)) >= PAGE_CACHE_SIZE
)
299 memset(io_ctl
, 0, sizeof(struct io_ctl
));
301 io_ctl
->pages
= kzalloc(sizeof(struct page
*) * num_pages
, GFP_NOFS
);
305 io_ctl
->num_pages
= num_pages
;
307 io_ctl
->check_crcs
= check_crcs
;
312 static void io_ctl_free(struct io_ctl
*io_ctl
)
314 kfree(io_ctl
->pages
);
317 static void io_ctl_unmap_page(struct io_ctl
*io_ctl
)
320 kunmap(io_ctl
->page
);
326 static void io_ctl_map_page(struct io_ctl
*io_ctl
, int clear
)
328 ASSERT(io_ctl
->index
< io_ctl
->num_pages
);
329 io_ctl
->page
= io_ctl
->pages
[io_ctl
->index
++];
330 io_ctl
->cur
= kmap(io_ctl
->page
);
331 io_ctl
->orig
= io_ctl
->cur
;
332 io_ctl
->size
= PAGE_CACHE_SIZE
;
334 memset(io_ctl
->cur
, 0, PAGE_CACHE_SIZE
);
337 static void io_ctl_drop_pages(struct io_ctl
*io_ctl
)
341 io_ctl_unmap_page(io_ctl
);
343 for (i
= 0; i
< io_ctl
->num_pages
; i
++) {
344 if (io_ctl
->pages
[i
]) {
345 ClearPageChecked(io_ctl
->pages
[i
]);
346 unlock_page(io_ctl
->pages
[i
]);
347 page_cache_release(io_ctl
->pages
[i
]);
352 static int io_ctl_prepare_pages(struct io_ctl
*io_ctl
, struct inode
*inode
,
356 gfp_t mask
= btrfs_alloc_write_mask(inode
->i_mapping
);
359 for (i
= 0; i
< io_ctl
->num_pages
; i
++) {
360 page
= find_or_create_page(inode
->i_mapping
, i
, mask
);
362 io_ctl_drop_pages(io_ctl
);
365 io_ctl
->pages
[i
] = page
;
366 if (uptodate
&& !PageUptodate(page
)) {
367 btrfs_readpage(NULL
, page
);
369 if (!PageUptodate(page
)) {
370 btrfs_err(BTRFS_I(inode
)->root
->fs_info
,
371 "error reading free space cache");
372 io_ctl_drop_pages(io_ctl
);
378 for (i
= 0; i
< io_ctl
->num_pages
; i
++) {
379 clear_page_dirty_for_io(io_ctl
->pages
[i
]);
380 set_page_extent_mapped(io_ctl
->pages
[i
]);
386 static void io_ctl_set_generation(struct io_ctl
*io_ctl
, u64 generation
)
390 io_ctl_map_page(io_ctl
, 1);
393 * Skip the csum areas. If we don't check crcs then we just have a
394 * 64bit chunk at the front of the first page.
396 if (io_ctl
->check_crcs
) {
397 io_ctl
->cur
+= (sizeof(u32
) * io_ctl
->num_pages
);
398 io_ctl
->size
-= sizeof(u64
) + (sizeof(u32
) * io_ctl
->num_pages
);
400 io_ctl
->cur
+= sizeof(u64
);
401 io_ctl
->size
-= sizeof(u64
) * 2;
405 *val
= cpu_to_le64(generation
);
406 io_ctl
->cur
+= sizeof(u64
);
409 static int io_ctl_check_generation(struct io_ctl
*io_ctl
, u64 generation
)
414 * Skip the crc area. If we don't check crcs then we just have a 64bit
415 * chunk at the front of the first page.
417 if (io_ctl
->check_crcs
) {
418 io_ctl
->cur
+= sizeof(u32
) * io_ctl
->num_pages
;
419 io_ctl
->size
-= sizeof(u64
) +
420 (sizeof(u32
) * io_ctl
->num_pages
);
422 io_ctl
->cur
+= sizeof(u64
);
423 io_ctl
->size
-= sizeof(u64
) * 2;
427 if (le64_to_cpu(*gen
) != generation
) {
428 printk_ratelimited(KERN_ERR
"BTRFS: space cache generation "
429 "(%Lu) does not match inode (%Lu)\n", *gen
,
431 io_ctl_unmap_page(io_ctl
);
434 io_ctl
->cur
+= sizeof(u64
);
438 static void io_ctl_set_crc(struct io_ctl
*io_ctl
, int index
)
444 if (!io_ctl
->check_crcs
) {
445 io_ctl_unmap_page(io_ctl
);
450 offset
= sizeof(u32
) * io_ctl
->num_pages
;
452 crc
= btrfs_csum_data(io_ctl
->orig
+ offset
, crc
,
453 PAGE_CACHE_SIZE
- offset
);
454 btrfs_csum_final(crc
, (char *)&crc
);
455 io_ctl_unmap_page(io_ctl
);
456 tmp
= kmap(io_ctl
->pages
[0]);
459 kunmap(io_ctl
->pages
[0]);
462 static int io_ctl_check_crc(struct io_ctl
*io_ctl
, int index
)
468 if (!io_ctl
->check_crcs
) {
469 io_ctl_map_page(io_ctl
, 0);
474 offset
= sizeof(u32
) * io_ctl
->num_pages
;
476 tmp
= kmap(io_ctl
->pages
[0]);
479 kunmap(io_ctl
->pages
[0]);
481 io_ctl_map_page(io_ctl
, 0);
482 crc
= btrfs_csum_data(io_ctl
->orig
+ offset
, crc
,
483 PAGE_CACHE_SIZE
- offset
);
484 btrfs_csum_final(crc
, (char *)&crc
);
486 printk_ratelimited(KERN_ERR
"BTRFS: csum mismatch on free "
488 io_ctl_unmap_page(io_ctl
);
495 static int io_ctl_add_entry(struct io_ctl
*io_ctl
, u64 offset
, u64 bytes
,
498 struct btrfs_free_space_entry
*entry
;
504 entry
->offset
= cpu_to_le64(offset
);
505 entry
->bytes
= cpu_to_le64(bytes
);
506 entry
->type
= (bitmap
) ? BTRFS_FREE_SPACE_BITMAP
:
507 BTRFS_FREE_SPACE_EXTENT
;
508 io_ctl
->cur
+= sizeof(struct btrfs_free_space_entry
);
509 io_ctl
->size
-= sizeof(struct btrfs_free_space_entry
);
511 if (io_ctl
->size
>= sizeof(struct btrfs_free_space_entry
))
514 io_ctl_set_crc(io_ctl
, io_ctl
->index
- 1);
516 /* No more pages to map */
517 if (io_ctl
->index
>= io_ctl
->num_pages
)
520 /* map the next page */
521 io_ctl_map_page(io_ctl
, 1);
525 static int io_ctl_add_bitmap(struct io_ctl
*io_ctl
, void *bitmap
)
531 * If we aren't at the start of the current page, unmap this one and
532 * map the next one if there is any left.
534 if (io_ctl
->cur
!= io_ctl
->orig
) {
535 io_ctl_set_crc(io_ctl
, io_ctl
->index
- 1);
536 if (io_ctl
->index
>= io_ctl
->num_pages
)
538 io_ctl_map_page(io_ctl
, 0);
541 memcpy(io_ctl
->cur
, bitmap
, PAGE_CACHE_SIZE
);
542 io_ctl_set_crc(io_ctl
, io_ctl
->index
- 1);
543 if (io_ctl
->index
< io_ctl
->num_pages
)
544 io_ctl_map_page(io_ctl
, 0);
548 static void io_ctl_zero_remaining_pages(struct io_ctl
*io_ctl
)
551 * If we're not on the boundary we know we've modified the page and we
552 * need to crc the page.
554 if (io_ctl
->cur
!= io_ctl
->orig
)
555 io_ctl_set_crc(io_ctl
, io_ctl
->index
- 1);
557 io_ctl_unmap_page(io_ctl
);
559 while (io_ctl
->index
< io_ctl
->num_pages
) {
560 io_ctl_map_page(io_ctl
, 1);
561 io_ctl_set_crc(io_ctl
, io_ctl
->index
- 1);
565 static int io_ctl_read_entry(struct io_ctl
*io_ctl
,
566 struct btrfs_free_space
*entry
, u8
*type
)
568 struct btrfs_free_space_entry
*e
;
572 ret
= io_ctl_check_crc(io_ctl
, io_ctl
->index
);
578 entry
->offset
= le64_to_cpu(e
->offset
);
579 entry
->bytes
= le64_to_cpu(e
->bytes
);
581 io_ctl
->cur
+= sizeof(struct btrfs_free_space_entry
);
582 io_ctl
->size
-= sizeof(struct btrfs_free_space_entry
);
584 if (io_ctl
->size
>= sizeof(struct btrfs_free_space_entry
))
587 io_ctl_unmap_page(io_ctl
);
592 static int io_ctl_read_bitmap(struct io_ctl
*io_ctl
,
593 struct btrfs_free_space
*entry
)
597 ret
= io_ctl_check_crc(io_ctl
, io_ctl
->index
);
601 memcpy(entry
->bitmap
, io_ctl
->cur
, PAGE_CACHE_SIZE
);
602 io_ctl_unmap_page(io_ctl
);
608 * Since we attach pinned extents after the fact we can have contiguous sections
609 * of free space that are split up in entries. This poses a problem with the
610 * tree logging stuff since it could have allocated across what appears to be 2
611 * entries since we would have merged the entries when adding the pinned extents
612 * back to the free space cache. So run through the space cache that we just
613 * loaded and merge contiguous entries. This will make the log replay stuff not
614 * blow up and it will make for nicer allocator behavior.
616 static void merge_space_tree(struct btrfs_free_space_ctl
*ctl
)
618 struct btrfs_free_space
*e
, *prev
= NULL
;
622 spin_lock(&ctl
->tree_lock
);
623 for (n
= rb_first(&ctl
->free_space_offset
); n
; n
= rb_next(n
)) {
624 e
= rb_entry(n
, struct btrfs_free_space
, offset_index
);
627 if (e
->bitmap
|| prev
->bitmap
)
629 if (prev
->offset
+ prev
->bytes
== e
->offset
) {
630 unlink_free_space(ctl
, prev
);
631 unlink_free_space(ctl
, e
);
632 prev
->bytes
+= e
->bytes
;
633 kmem_cache_free(btrfs_free_space_cachep
, e
);
634 link_free_space(ctl
, prev
);
636 spin_unlock(&ctl
->tree_lock
);
642 spin_unlock(&ctl
->tree_lock
);
645 static int __load_free_space_cache(struct btrfs_root
*root
, struct inode
*inode
,
646 struct btrfs_free_space_ctl
*ctl
,
647 struct btrfs_path
*path
, u64 offset
)
649 struct btrfs_free_space_header
*header
;
650 struct extent_buffer
*leaf
;
651 struct io_ctl io_ctl
;
652 struct btrfs_key key
;
653 struct btrfs_free_space
*e
, *n
;
661 /* Nothing in the space cache, goodbye */
662 if (!i_size_read(inode
))
665 key
.objectid
= BTRFS_FREE_SPACE_OBJECTID
;
669 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
673 btrfs_release_path(path
);
679 leaf
= path
->nodes
[0];
680 header
= btrfs_item_ptr(leaf
, path
->slots
[0],
681 struct btrfs_free_space_header
);
682 num_entries
= btrfs_free_space_entries(leaf
, header
);
683 num_bitmaps
= btrfs_free_space_bitmaps(leaf
, header
);
684 generation
= btrfs_free_space_generation(leaf
, header
);
685 btrfs_release_path(path
);
687 if (!BTRFS_I(inode
)->generation
) {
688 btrfs_info(root
->fs_info
,
689 "The free space cache file (%llu) is invalid. skip it\n",
694 if (BTRFS_I(inode
)->generation
!= generation
) {
695 btrfs_err(root
->fs_info
,
696 "free space inode generation (%llu) "
697 "did not match free space cache generation (%llu)",
698 BTRFS_I(inode
)->generation
, generation
);
705 ret
= io_ctl_init(&io_ctl
, inode
, root
, 0);
709 ret
= readahead_cache(inode
);
713 ret
= io_ctl_prepare_pages(&io_ctl
, inode
, 1);
717 ret
= io_ctl_check_crc(&io_ctl
, 0);
721 ret
= io_ctl_check_generation(&io_ctl
, generation
);
725 while (num_entries
) {
726 e
= kmem_cache_zalloc(btrfs_free_space_cachep
,
731 ret
= io_ctl_read_entry(&io_ctl
, e
, &type
);
733 kmem_cache_free(btrfs_free_space_cachep
, e
);
738 kmem_cache_free(btrfs_free_space_cachep
, e
);
742 if (type
== BTRFS_FREE_SPACE_EXTENT
) {
743 spin_lock(&ctl
->tree_lock
);
744 ret
= link_free_space(ctl
, e
);
745 spin_unlock(&ctl
->tree_lock
);
747 btrfs_err(root
->fs_info
,
748 "Duplicate entries in free space cache, dumping");
749 kmem_cache_free(btrfs_free_space_cachep
, e
);
755 e
->bitmap
= kzalloc(PAGE_CACHE_SIZE
, GFP_NOFS
);
758 btrfs_free_space_cachep
, e
);
761 spin_lock(&ctl
->tree_lock
);
762 ret
= link_free_space(ctl
, e
);
763 ctl
->total_bitmaps
++;
764 ctl
->op
->recalc_thresholds(ctl
);
765 spin_unlock(&ctl
->tree_lock
);
767 btrfs_err(root
->fs_info
,
768 "Duplicate entries in free space cache, dumping");
769 kmem_cache_free(btrfs_free_space_cachep
, e
);
772 list_add_tail(&e
->list
, &bitmaps
);
778 io_ctl_unmap_page(&io_ctl
);
781 * We add the bitmaps at the end of the entries in order that
782 * the bitmap entries are added to the cache.
784 list_for_each_entry_safe(e
, n
, &bitmaps
, list
) {
785 list_del_init(&e
->list
);
786 ret
= io_ctl_read_bitmap(&io_ctl
, e
);
791 io_ctl_drop_pages(&io_ctl
);
792 merge_space_tree(ctl
);
795 io_ctl_free(&io_ctl
);
798 io_ctl_drop_pages(&io_ctl
);
799 __btrfs_remove_free_space_cache(ctl
);
803 int load_free_space_cache(struct btrfs_fs_info
*fs_info
,
804 struct btrfs_block_group_cache
*block_group
)
806 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
807 struct btrfs_root
*root
= fs_info
->tree_root
;
809 struct btrfs_path
*path
;
812 u64 used
= btrfs_block_group_used(&block_group
->item
);
815 * If this block group has been marked to be cleared for one reason or
816 * another then we can't trust the on disk cache, so just return.
818 spin_lock(&block_group
->lock
);
819 if (block_group
->disk_cache_state
!= BTRFS_DC_WRITTEN
) {
820 spin_unlock(&block_group
->lock
);
823 spin_unlock(&block_group
->lock
);
825 path
= btrfs_alloc_path();
828 path
->search_commit_root
= 1;
829 path
->skip_locking
= 1;
831 inode
= lookup_free_space_inode(root
, block_group
, path
);
833 btrfs_free_path(path
);
837 /* We may have converted the inode and made the cache invalid. */
838 spin_lock(&block_group
->lock
);
839 if (block_group
->disk_cache_state
!= BTRFS_DC_WRITTEN
) {
840 spin_unlock(&block_group
->lock
);
841 btrfs_free_path(path
);
844 spin_unlock(&block_group
->lock
);
846 ret
= __load_free_space_cache(fs_info
->tree_root
, inode
, ctl
,
847 path
, block_group
->key
.objectid
);
848 btrfs_free_path(path
);
852 spin_lock(&ctl
->tree_lock
);
853 matched
= (ctl
->free_space
== (block_group
->key
.offset
- used
-
854 block_group
->bytes_super
));
855 spin_unlock(&ctl
->tree_lock
);
858 __btrfs_remove_free_space_cache(ctl
);
859 btrfs_warn(fs_info
, "block group %llu has wrong amount of free space",
860 block_group
->key
.objectid
);
865 /* This cache is bogus, make sure it gets cleared */
866 spin_lock(&block_group
->lock
);
867 block_group
->disk_cache_state
= BTRFS_DC_CLEAR
;
868 spin_unlock(&block_group
->lock
);
871 btrfs_warn(fs_info
, "failed to load free space cache for block group %llu, rebuild it now",
872 block_group
->key
.objectid
);
879 static noinline_for_stack
880 int write_cache_extent_entries(struct io_ctl
*io_ctl
,
881 struct btrfs_free_space_ctl
*ctl
,
882 struct btrfs_block_group_cache
*block_group
,
883 int *entries
, int *bitmaps
,
884 struct list_head
*bitmap_list
)
887 struct btrfs_free_cluster
*cluster
= NULL
;
888 struct rb_node
*node
= rb_first(&ctl
->free_space_offset
);
889 struct btrfs_trim_range
*trim_entry
;
891 /* Get the cluster for this block_group if it exists */
892 if (block_group
&& !list_empty(&block_group
->cluster_list
)) {
893 cluster
= list_entry(block_group
->cluster_list
.next
,
894 struct btrfs_free_cluster
,
898 if (!node
&& cluster
) {
899 node
= rb_first(&cluster
->root
);
903 /* Write out the extent entries */
905 struct btrfs_free_space
*e
;
907 e
= rb_entry(node
, struct btrfs_free_space
, offset_index
);
910 ret
= io_ctl_add_entry(io_ctl
, e
->offset
, e
->bytes
,
916 list_add_tail(&e
->list
, bitmap_list
);
919 node
= rb_next(node
);
920 if (!node
&& cluster
) {
921 node
= rb_first(&cluster
->root
);
927 * Make sure we don't miss any range that was removed from our rbtree
928 * because trimming is running. Otherwise after a umount+mount (or crash
929 * after committing the transaction) we would leak free space and get
930 * an inconsistent free space cache report from fsck.
932 list_for_each_entry(trim_entry
, &ctl
->trimming_ranges
, list
) {
933 ret
= io_ctl_add_entry(io_ctl
, trim_entry
->start
,
934 trim_entry
->bytes
, NULL
);
945 static noinline_for_stack
int
946 update_cache_item(struct btrfs_trans_handle
*trans
,
947 struct btrfs_root
*root
,
949 struct btrfs_path
*path
, u64 offset
,
950 int entries
, int bitmaps
)
952 struct btrfs_key key
;
953 struct btrfs_free_space_header
*header
;
954 struct extent_buffer
*leaf
;
957 key
.objectid
= BTRFS_FREE_SPACE_OBJECTID
;
961 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
963 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, 0, inode
->i_size
- 1,
964 EXTENT_DIRTY
| EXTENT_DELALLOC
, 0, 0, NULL
,
968 leaf
= path
->nodes
[0];
970 struct btrfs_key found_key
;
971 ASSERT(path
->slots
[0]);
973 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
974 if (found_key
.objectid
!= BTRFS_FREE_SPACE_OBJECTID
||
975 found_key
.offset
!= offset
) {
976 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, 0,
978 EXTENT_DIRTY
| EXTENT_DELALLOC
, 0, 0,
980 btrfs_release_path(path
);
985 BTRFS_I(inode
)->generation
= trans
->transid
;
986 header
= btrfs_item_ptr(leaf
, path
->slots
[0],
987 struct btrfs_free_space_header
);
988 btrfs_set_free_space_entries(leaf
, header
, entries
);
989 btrfs_set_free_space_bitmaps(leaf
, header
, bitmaps
);
990 btrfs_set_free_space_generation(leaf
, header
, trans
->transid
);
991 btrfs_mark_buffer_dirty(leaf
);
992 btrfs_release_path(path
);
1000 static noinline_for_stack
int
1001 write_pinned_extent_entries(struct btrfs_root
*root
,
1002 struct btrfs_block_group_cache
*block_group
,
1003 struct io_ctl
*io_ctl
,
1006 u64 start
, extent_start
, extent_end
, len
;
1007 struct extent_io_tree
*unpin
= NULL
;
1014 * We want to add any pinned extents to our free space cache
1015 * so we don't leak the space
1017 * We shouldn't have switched the pinned extents yet so this is the
1020 unpin
= root
->fs_info
->pinned_extents
;
1022 start
= block_group
->key
.objectid
;
1024 while (start
< block_group
->key
.objectid
+ block_group
->key
.offset
) {
1025 ret
= find_first_extent_bit(unpin
, start
,
1026 &extent_start
, &extent_end
,
1027 EXTENT_DIRTY
, NULL
);
1031 /* This pinned extent is out of our range */
1032 if (extent_start
>= block_group
->key
.objectid
+
1033 block_group
->key
.offset
)
1036 extent_start
= max(extent_start
, start
);
1037 extent_end
= min(block_group
->key
.objectid
+
1038 block_group
->key
.offset
, extent_end
+ 1);
1039 len
= extent_end
- extent_start
;
1042 ret
= io_ctl_add_entry(io_ctl
, extent_start
, len
, NULL
);
1052 static noinline_for_stack
int
1053 write_bitmap_entries(struct io_ctl
*io_ctl
, struct list_head
*bitmap_list
)
1055 struct list_head
*pos
, *n
;
1058 /* Write out the bitmaps */
1059 list_for_each_safe(pos
, n
, bitmap_list
) {
1060 struct btrfs_free_space
*entry
=
1061 list_entry(pos
, struct btrfs_free_space
, list
);
1063 ret
= io_ctl_add_bitmap(io_ctl
, entry
->bitmap
);
1066 list_del_init(&entry
->list
);
1072 static int flush_dirty_cache(struct inode
*inode
)
1076 ret
= btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
1078 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, 0, inode
->i_size
- 1,
1079 EXTENT_DIRTY
| EXTENT_DELALLOC
, 0, 0, NULL
,
1085 static void noinline_for_stack
1086 cleanup_write_cache_enospc(struct inode
*inode
,
1087 struct io_ctl
*io_ctl
,
1088 struct extent_state
**cached_state
,
1089 struct list_head
*bitmap_list
)
1091 struct list_head
*pos
, *n
;
1093 list_for_each_safe(pos
, n
, bitmap_list
) {
1094 struct btrfs_free_space
*entry
=
1095 list_entry(pos
, struct btrfs_free_space
, list
);
1096 list_del_init(&entry
->list
);
1098 io_ctl_drop_pages(io_ctl
);
1099 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, 0,
1100 i_size_read(inode
) - 1, cached_state
,
1105 * __btrfs_write_out_cache - write out cached info to an inode
1106 * @root - the root the inode belongs to
1107 * @ctl - the free space cache we are going to write out
1108 * @block_group - the block_group for this cache if it belongs to a block_group
1109 * @trans - the trans handle
1110 * @path - the path to use
1111 * @offset - the offset for the key we'll insert
1113 * This function writes out a free space cache struct to disk for quick recovery
1114 * on mount. This will return 0 if it was successfull in writing the cache out,
1115 * and -1 if it was not.
1117 static int __btrfs_write_out_cache(struct btrfs_root
*root
, struct inode
*inode
,
1118 struct btrfs_free_space_ctl
*ctl
,
1119 struct btrfs_block_group_cache
*block_group
,
1120 struct btrfs_trans_handle
*trans
,
1121 struct btrfs_path
*path
, u64 offset
)
1123 struct extent_state
*cached_state
= NULL
;
1124 struct io_ctl io_ctl
;
1125 LIST_HEAD(bitmap_list
);
1130 if (!i_size_read(inode
))
1133 ret
= io_ctl_init(&io_ctl
, inode
, root
, 1);
1137 if (block_group
&& (block_group
->flags
& BTRFS_BLOCK_GROUP_DATA
)) {
1138 down_write(&block_group
->data_rwsem
);
1139 spin_lock(&block_group
->lock
);
1140 if (block_group
->delalloc_bytes
) {
1141 block_group
->disk_cache_state
= BTRFS_DC_WRITTEN
;
1142 spin_unlock(&block_group
->lock
);
1143 up_write(&block_group
->data_rwsem
);
1144 BTRFS_I(inode
)->generation
= 0;
1148 spin_unlock(&block_group
->lock
);
1151 /* Lock all pages first so we can lock the extent safely. */
1152 io_ctl_prepare_pages(&io_ctl
, inode
, 0);
1154 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, 0, i_size_read(inode
) - 1,
1157 io_ctl_set_generation(&io_ctl
, trans
->transid
);
1159 mutex_lock(&ctl
->cache_writeout_mutex
);
1160 /* Write out the extent entries in the free space cache */
1161 ret
= write_cache_extent_entries(&io_ctl
, ctl
,
1162 block_group
, &entries
, &bitmaps
,
1165 mutex_unlock(&ctl
->cache_writeout_mutex
);
1170 * Some spaces that are freed in the current transaction are pinned,
1171 * they will be added into free space cache after the transaction is
1172 * committed, we shouldn't lose them.
1174 ret
= write_pinned_extent_entries(root
, block_group
, &io_ctl
, &entries
);
1176 mutex_unlock(&ctl
->cache_writeout_mutex
);
1181 * At last, we write out all the bitmaps and keep cache_writeout_mutex
1182 * locked while doing it because a concurrent trim can be manipulating
1183 * or freeing the bitmap.
1185 ret
= write_bitmap_entries(&io_ctl
, &bitmap_list
);
1186 mutex_unlock(&ctl
->cache_writeout_mutex
);
1190 /* Zero out the rest of the pages just to make sure */
1191 io_ctl_zero_remaining_pages(&io_ctl
);
1193 /* Everything is written out, now we dirty the pages in the file. */
1194 ret
= btrfs_dirty_pages(root
, inode
, io_ctl
.pages
, io_ctl
.num_pages
,
1195 0, i_size_read(inode
), &cached_state
);
1199 if (block_group
&& (block_group
->flags
& BTRFS_BLOCK_GROUP_DATA
))
1200 up_write(&block_group
->data_rwsem
);
1202 * Release the pages and unlock the extent, we will flush
1205 io_ctl_drop_pages(&io_ctl
);
1207 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, 0,
1208 i_size_read(inode
) - 1, &cached_state
, GFP_NOFS
);
1210 /* Flush the dirty pages in the cache file. */
1211 ret
= flush_dirty_cache(inode
);
1215 /* Update the cache item to tell everyone this cache file is valid. */
1216 ret
= update_cache_item(trans
, root
, inode
, path
, offset
,
1219 io_ctl_free(&io_ctl
);
1221 invalidate_inode_pages2(inode
->i_mapping
);
1222 BTRFS_I(inode
)->generation
= 0;
1224 btrfs_update_inode(trans
, root
, inode
);
1228 cleanup_write_cache_enospc(inode
, &io_ctl
, &cached_state
, &bitmap_list
);
1230 if (block_group
&& (block_group
->flags
& BTRFS_BLOCK_GROUP_DATA
))
1231 up_write(&block_group
->data_rwsem
);
1236 int btrfs_write_out_cache(struct btrfs_root
*root
,
1237 struct btrfs_trans_handle
*trans
,
1238 struct btrfs_block_group_cache
*block_group
,
1239 struct btrfs_path
*path
)
1241 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
1242 struct inode
*inode
;
1244 enum btrfs_disk_cache_state dcs
= BTRFS_DC_WRITTEN
;
1246 root
= root
->fs_info
->tree_root
;
1248 spin_lock(&block_group
->lock
);
1249 if (block_group
->disk_cache_state
< BTRFS_DC_SETUP
) {
1250 spin_unlock(&block_group
->lock
);
1254 if (block_group
->delalloc_bytes
) {
1255 block_group
->disk_cache_state
= BTRFS_DC_WRITTEN
;
1256 spin_unlock(&block_group
->lock
);
1259 spin_unlock(&block_group
->lock
);
1261 inode
= lookup_free_space_inode(root
, block_group
, path
);
1265 ret
= __btrfs_write_out_cache(root
, inode
, ctl
, block_group
, trans
,
1266 path
, block_group
->key
.objectid
);
1268 dcs
= BTRFS_DC_ERROR
;
1271 btrfs_err(root
->fs_info
,
1272 "failed to write free space cache for block group %llu",
1273 block_group
->key
.objectid
);
1277 spin_lock(&block_group
->lock
);
1278 block_group
->disk_cache_state
= dcs
;
1279 spin_unlock(&block_group
->lock
);
1284 static inline unsigned long offset_to_bit(u64 bitmap_start
, u32 unit
,
1287 ASSERT(offset
>= bitmap_start
);
1288 offset
-= bitmap_start
;
1289 return (unsigned long)(div_u64(offset
, unit
));
1292 static inline unsigned long bytes_to_bits(u64 bytes
, u32 unit
)
1294 return (unsigned long)(div_u64(bytes
, unit
));
1297 static inline u64
offset_to_bitmap(struct btrfs_free_space_ctl
*ctl
,
1301 u64 bytes_per_bitmap
;
1303 bytes_per_bitmap
= BITS_PER_BITMAP
* ctl
->unit
;
1304 bitmap_start
= offset
- ctl
->start
;
1305 bitmap_start
= div64_u64(bitmap_start
, bytes_per_bitmap
);
1306 bitmap_start
*= bytes_per_bitmap
;
1307 bitmap_start
+= ctl
->start
;
1309 return bitmap_start
;
1312 static int tree_insert_offset(struct rb_root
*root
, u64 offset
,
1313 struct rb_node
*node
, int bitmap
)
1315 struct rb_node
**p
= &root
->rb_node
;
1316 struct rb_node
*parent
= NULL
;
1317 struct btrfs_free_space
*info
;
1321 info
= rb_entry(parent
, struct btrfs_free_space
, offset_index
);
1323 if (offset
< info
->offset
) {
1325 } else if (offset
> info
->offset
) {
1326 p
= &(*p
)->rb_right
;
1329 * we could have a bitmap entry and an extent entry
1330 * share the same offset. If this is the case, we want
1331 * the extent entry to always be found first if we do a
1332 * linear search through the tree, since we want to have
1333 * the quickest allocation time, and allocating from an
1334 * extent is faster than allocating from a bitmap. So
1335 * if we're inserting a bitmap and we find an entry at
1336 * this offset, we want to go right, or after this entry
1337 * logically. If we are inserting an extent and we've
1338 * found a bitmap, we want to go left, or before
1346 p
= &(*p
)->rb_right
;
1348 if (!info
->bitmap
) {
1357 rb_link_node(node
, parent
, p
);
1358 rb_insert_color(node
, root
);
1364 * searches the tree for the given offset.
1366 * fuzzy - If this is set, then we are trying to make an allocation, and we just
1367 * want a section that has at least bytes size and comes at or after the given
1370 static struct btrfs_free_space
*
1371 tree_search_offset(struct btrfs_free_space_ctl
*ctl
,
1372 u64 offset
, int bitmap_only
, int fuzzy
)
1374 struct rb_node
*n
= ctl
->free_space_offset
.rb_node
;
1375 struct btrfs_free_space
*entry
, *prev
= NULL
;
1377 /* find entry that is closest to the 'offset' */
1384 entry
= rb_entry(n
, struct btrfs_free_space
, offset_index
);
1387 if (offset
< entry
->offset
)
1389 else if (offset
> entry
->offset
)
1402 * bitmap entry and extent entry may share same offset,
1403 * in that case, bitmap entry comes after extent entry.
1408 entry
= rb_entry(n
, struct btrfs_free_space
, offset_index
);
1409 if (entry
->offset
!= offset
)
1412 WARN_ON(!entry
->bitmap
);
1415 if (entry
->bitmap
) {
1417 * if previous extent entry covers the offset,
1418 * we should return it instead of the bitmap entry
1420 n
= rb_prev(&entry
->offset_index
);
1422 prev
= rb_entry(n
, struct btrfs_free_space
,
1424 if (!prev
->bitmap
&&
1425 prev
->offset
+ prev
->bytes
> offset
)
1435 /* find last entry before the 'offset' */
1437 if (entry
->offset
> offset
) {
1438 n
= rb_prev(&entry
->offset_index
);
1440 entry
= rb_entry(n
, struct btrfs_free_space
,
1442 ASSERT(entry
->offset
<= offset
);
1451 if (entry
->bitmap
) {
1452 n
= rb_prev(&entry
->offset_index
);
1454 prev
= rb_entry(n
, struct btrfs_free_space
,
1456 if (!prev
->bitmap
&&
1457 prev
->offset
+ prev
->bytes
> offset
)
1460 if (entry
->offset
+ BITS_PER_BITMAP
* ctl
->unit
> offset
)
1462 } else if (entry
->offset
+ entry
->bytes
> offset
)
1469 if (entry
->bitmap
) {
1470 if (entry
->offset
+ BITS_PER_BITMAP
*
1474 if (entry
->offset
+ entry
->bytes
> offset
)
1478 n
= rb_next(&entry
->offset_index
);
1481 entry
= rb_entry(n
, struct btrfs_free_space
, offset_index
);
1487 __unlink_free_space(struct btrfs_free_space_ctl
*ctl
,
1488 struct btrfs_free_space
*info
)
1490 rb_erase(&info
->offset_index
, &ctl
->free_space_offset
);
1491 ctl
->free_extents
--;
1494 static void unlink_free_space(struct btrfs_free_space_ctl
*ctl
,
1495 struct btrfs_free_space
*info
)
1497 __unlink_free_space(ctl
, info
);
1498 ctl
->free_space
-= info
->bytes
;
1501 static int link_free_space(struct btrfs_free_space_ctl
*ctl
,
1502 struct btrfs_free_space
*info
)
1506 ASSERT(info
->bytes
|| info
->bitmap
);
1507 ret
= tree_insert_offset(&ctl
->free_space_offset
, info
->offset
,
1508 &info
->offset_index
, (info
->bitmap
!= NULL
));
1512 ctl
->free_space
+= info
->bytes
;
1513 ctl
->free_extents
++;
1517 static void recalculate_thresholds(struct btrfs_free_space_ctl
*ctl
)
1519 struct btrfs_block_group_cache
*block_group
= ctl
->private;
1523 u64 size
= block_group
->key
.offset
;
1524 u64 bytes_per_bg
= BITS_PER_BITMAP
* ctl
->unit
;
1525 int max_bitmaps
= div64_u64(size
+ bytes_per_bg
- 1, bytes_per_bg
);
1527 max_bitmaps
= max(max_bitmaps
, 1);
1529 ASSERT(ctl
->total_bitmaps
<= max_bitmaps
);
1532 * The goal is to keep the total amount of memory used per 1gb of space
1533 * at or below 32k, so we need to adjust how much memory we allow to be
1534 * used by extent based free space tracking
1536 if (size
< 1024 * 1024 * 1024)
1537 max_bytes
= MAX_CACHE_BYTES_PER_GIG
;
1539 max_bytes
= MAX_CACHE_BYTES_PER_GIG
*
1540 div64_u64(size
, 1024 * 1024 * 1024);
1543 * we want to account for 1 more bitmap than what we have so we can make
1544 * sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as
1545 * we add more bitmaps.
1547 bitmap_bytes
= (ctl
->total_bitmaps
+ 1) * PAGE_CACHE_SIZE
;
1549 if (bitmap_bytes
>= max_bytes
) {
1550 ctl
->extents_thresh
= 0;
1555 * we want the extent entry threshold to always be at most 1/2 the maxw
1556 * bytes we can have, or whatever is less than that.
1558 extent_bytes
= max_bytes
- bitmap_bytes
;
1559 extent_bytes
= min_t(u64
, extent_bytes
, div64_u64(max_bytes
, 2));
1561 ctl
->extents_thresh
=
1562 div64_u64(extent_bytes
, (sizeof(struct btrfs_free_space
)));
1565 static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl
*ctl
,
1566 struct btrfs_free_space
*info
,
1567 u64 offset
, u64 bytes
)
1569 unsigned long start
, count
;
1571 start
= offset_to_bit(info
->offset
, ctl
->unit
, offset
);
1572 count
= bytes_to_bits(bytes
, ctl
->unit
);
1573 ASSERT(start
+ count
<= BITS_PER_BITMAP
);
1575 bitmap_clear(info
->bitmap
, start
, count
);
1577 info
->bytes
-= bytes
;
1580 static void bitmap_clear_bits(struct btrfs_free_space_ctl
*ctl
,
1581 struct btrfs_free_space
*info
, u64 offset
,
1584 __bitmap_clear_bits(ctl
, info
, offset
, bytes
);
1585 ctl
->free_space
-= bytes
;
1588 static void bitmap_set_bits(struct btrfs_free_space_ctl
*ctl
,
1589 struct btrfs_free_space
*info
, u64 offset
,
1592 unsigned long start
, count
;
1594 start
= offset_to_bit(info
->offset
, ctl
->unit
, offset
);
1595 count
= bytes_to_bits(bytes
, ctl
->unit
);
1596 ASSERT(start
+ count
<= BITS_PER_BITMAP
);
1598 bitmap_set(info
->bitmap
, start
, count
);
1600 info
->bytes
+= bytes
;
1601 ctl
->free_space
+= bytes
;
1605 * If we can not find suitable extent, we will use bytes to record
1606 * the size of the max extent.
1608 static int search_bitmap(struct btrfs_free_space_ctl
*ctl
,
1609 struct btrfs_free_space
*bitmap_info
, u64
*offset
,
1612 unsigned long found_bits
= 0;
1613 unsigned long max_bits
= 0;
1614 unsigned long bits
, i
;
1615 unsigned long next_zero
;
1616 unsigned long extent_bits
;
1618 i
= offset_to_bit(bitmap_info
->offset
, ctl
->unit
,
1619 max_t(u64
, *offset
, bitmap_info
->offset
));
1620 bits
= bytes_to_bits(*bytes
, ctl
->unit
);
1622 for_each_set_bit_from(i
, bitmap_info
->bitmap
, BITS_PER_BITMAP
) {
1623 next_zero
= find_next_zero_bit(bitmap_info
->bitmap
,
1624 BITS_PER_BITMAP
, i
);
1625 extent_bits
= next_zero
- i
;
1626 if (extent_bits
>= bits
) {
1627 found_bits
= extent_bits
;
1629 } else if (extent_bits
> max_bits
) {
1630 max_bits
= extent_bits
;
1636 *offset
= (u64
)(i
* ctl
->unit
) + bitmap_info
->offset
;
1637 *bytes
= (u64
)(found_bits
) * ctl
->unit
;
1641 *bytes
= (u64
)(max_bits
) * ctl
->unit
;
1645 /* Cache the size of the max extent in bytes */
1646 static struct btrfs_free_space
*
1647 find_free_space(struct btrfs_free_space_ctl
*ctl
, u64
*offset
, u64
*bytes
,
1648 unsigned long align
, u64
*max_extent_size
)
1650 struct btrfs_free_space
*entry
;
1651 struct rb_node
*node
;
1656 if (!ctl
->free_space_offset
.rb_node
)
1659 entry
= tree_search_offset(ctl
, offset_to_bitmap(ctl
, *offset
), 0, 1);
1663 for (node
= &entry
->offset_index
; node
; node
= rb_next(node
)) {
1664 entry
= rb_entry(node
, struct btrfs_free_space
, offset_index
);
1665 if (entry
->bytes
< *bytes
) {
1666 if (entry
->bytes
> *max_extent_size
)
1667 *max_extent_size
= entry
->bytes
;
1671 /* make sure the space returned is big enough
1672 * to match our requested alignment
1674 if (*bytes
>= align
) {
1675 tmp
= entry
->offset
- ctl
->start
+ align
- 1;
1677 tmp
= tmp
* align
+ ctl
->start
;
1678 align_off
= tmp
- entry
->offset
;
1681 tmp
= entry
->offset
;
1684 if (entry
->bytes
< *bytes
+ align_off
) {
1685 if (entry
->bytes
> *max_extent_size
)
1686 *max_extent_size
= entry
->bytes
;
1690 if (entry
->bitmap
) {
1693 ret
= search_bitmap(ctl
, entry
, &tmp
, &size
);
1698 } else if (size
> *max_extent_size
) {
1699 *max_extent_size
= size
;
1705 *bytes
= entry
->bytes
- align_off
;
1712 static void add_new_bitmap(struct btrfs_free_space_ctl
*ctl
,
1713 struct btrfs_free_space
*info
, u64 offset
)
1715 info
->offset
= offset_to_bitmap(ctl
, offset
);
1717 INIT_LIST_HEAD(&info
->list
);
1718 link_free_space(ctl
, info
);
1719 ctl
->total_bitmaps
++;
1721 ctl
->op
->recalc_thresholds(ctl
);
1724 static void free_bitmap(struct btrfs_free_space_ctl
*ctl
,
1725 struct btrfs_free_space
*bitmap_info
)
1727 unlink_free_space(ctl
, bitmap_info
);
1728 kfree(bitmap_info
->bitmap
);
1729 kmem_cache_free(btrfs_free_space_cachep
, bitmap_info
);
1730 ctl
->total_bitmaps
--;
1731 ctl
->op
->recalc_thresholds(ctl
);
1734 static noinline
int remove_from_bitmap(struct btrfs_free_space_ctl
*ctl
,
1735 struct btrfs_free_space
*bitmap_info
,
1736 u64
*offset
, u64
*bytes
)
1739 u64 search_start
, search_bytes
;
1743 end
= bitmap_info
->offset
+ (u64
)(BITS_PER_BITMAP
* ctl
->unit
) - 1;
1746 * We need to search for bits in this bitmap. We could only cover some
1747 * of the extent in this bitmap thanks to how we add space, so we need
1748 * to search for as much as it as we can and clear that amount, and then
1749 * go searching for the next bit.
1751 search_start
= *offset
;
1752 search_bytes
= ctl
->unit
;
1753 search_bytes
= min(search_bytes
, end
- search_start
+ 1);
1754 ret
= search_bitmap(ctl
, bitmap_info
, &search_start
, &search_bytes
);
1755 if (ret
< 0 || search_start
!= *offset
)
1758 /* We may have found more bits than what we need */
1759 search_bytes
= min(search_bytes
, *bytes
);
1761 /* Cannot clear past the end of the bitmap */
1762 search_bytes
= min(search_bytes
, end
- search_start
+ 1);
1764 bitmap_clear_bits(ctl
, bitmap_info
, search_start
, search_bytes
);
1765 *offset
+= search_bytes
;
1766 *bytes
-= search_bytes
;
1769 struct rb_node
*next
= rb_next(&bitmap_info
->offset_index
);
1770 if (!bitmap_info
->bytes
)
1771 free_bitmap(ctl
, bitmap_info
);
1774 * no entry after this bitmap, but we still have bytes to
1775 * remove, so something has gone wrong.
1780 bitmap_info
= rb_entry(next
, struct btrfs_free_space
,
1784 * if the next entry isn't a bitmap we need to return to let the
1785 * extent stuff do its work.
1787 if (!bitmap_info
->bitmap
)
1791 * Ok the next item is a bitmap, but it may not actually hold
1792 * the information for the rest of this free space stuff, so
1793 * look for it, and if we don't find it return so we can try
1794 * everything over again.
1796 search_start
= *offset
;
1797 search_bytes
= ctl
->unit
;
1798 ret
= search_bitmap(ctl
, bitmap_info
, &search_start
,
1800 if (ret
< 0 || search_start
!= *offset
)
1804 } else if (!bitmap_info
->bytes
)
1805 free_bitmap(ctl
, bitmap_info
);
1810 static u64
add_bytes_to_bitmap(struct btrfs_free_space_ctl
*ctl
,
1811 struct btrfs_free_space
*info
, u64 offset
,
1814 u64 bytes_to_set
= 0;
1817 end
= info
->offset
+ (u64
)(BITS_PER_BITMAP
* ctl
->unit
);
1819 bytes_to_set
= min(end
- offset
, bytes
);
1821 bitmap_set_bits(ctl
, info
, offset
, bytes_to_set
);
1823 return bytes_to_set
;
1827 static bool use_bitmap(struct btrfs_free_space_ctl
*ctl
,
1828 struct btrfs_free_space
*info
)
1830 struct btrfs_block_group_cache
*block_group
= ctl
->private;
1833 * If we are below the extents threshold then we can add this as an
1834 * extent, and don't have to deal with the bitmap
1836 if (ctl
->free_extents
< ctl
->extents_thresh
) {
1838 * If this block group has some small extents we don't want to
1839 * use up all of our free slots in the cache with them, we want
1840 * to reserve them to larger extents, however if we have plent
1841 * of cache left then go ahead an dadd them, no sense in adding
1842 * the overhead of a bitmap if we don't have to.
1844 if (info
->bytes
<= block_group
->sectorsize
* 4) {
1845 if (ctl
->free_extents
* 2 <= ctl
->extents_thresh
)
1853 * The original block groups from mkfs can be really small, like 8
1854 * megabytes, so don't bother with a bitmap for those entries. However
1855 * some block groups can be smaller than what a bitmap would cover but
1856 * are still large enough that they could overflow the 32k memory limit,
1857 * so allow those block groups to still be allowed to have a bitmap
1860 if (((BITS_PER_BITMAP
* ctl
->unit
) >> 1) > block_group
->key
.offset
)
1866 static struct btrfs_free_space_op free_space_op
= {
1867 .recalc_thresholds
= recalculate_thresholds
,
1868 .use_bitmap
= use_bitmap
,
1871 static int insert_into_bitmap(struct btrfs_free_space_ctl
*ctl
,
1872 struct btrfs_free_space
*info
)
1874 struct btrfs_free_space
*bitmap_info
;
1875 struct btrfs_block_group_cache
*block_group
= NULL
;
1877 u64 bytes
, offset
, bytes_added
;
1880 bytes
= info
->bytes
;
1881 offset
= info
->offset
;
1883 if (!ctl
->op
->use_bitmap(ctl
, info
))
1886 if (ctl
->op
== &free_space_op
)
1887 block_group
= ctl
->private;
1890 * Since we link bitmaps right into the cluster we need to see if we
1891 * have a cluster here, and if so and it has our bitmap we need to add
1892 * the free space to that bitmap.
1894 if (block_group
&& !list_empty(&block_group
->cluster_list
)) {
1895 struct btrfs_free_cluster
*cluster
;
1896 struct rb_node
*node
;
1897 struct btrfs_free_space
*entry
;
1899 cluster
= list_entry(block_group
->cluster_list
.next
,
1900 struct btrfs_free_cluster
,
1902 spin_lock(&cluster
->lock
);
1903 node
= rb_first(&cluster
->root
);
1905 spin_unlock(&cluster
->lock
);
1906 goto no_cluster_bitmap
;
1909 entry
= rb_entry(node
, struct btrfs_free_space
, offset_index
);
1910 if (!entry
->bitmap
) {
1911 spin_unlock(&cluster
->lock
);
1912 goto no_cluster_bitmap
;
1915 if (entry
->offset
== offset_to_bitmap(ctl
, offset
)) {
1916 bytes_added
= add_bytes_to_bitmap(ctl
, entry
,
1918 bytes
-= bytes_added
;
1919 offset
+= bytes_added
;
1921 spin_unlock(&cluster
->lock
);
1929 bitmap_info
= tree_search_offset(ctl
, offset_to_bitmap(ctl
, offset
),
1936 bytes_added
= add_bytes_to_bitmap(ctl
, bitmap_info
, offset
, bytes
);
1937 bytes
-= bytes_added
;
1938 offset
+= bytes_added
;
1948 if (info
&& info
->bitmap
) {
1949 add_new_bitmap(ctl
, info
, offset
);
1954 spin_unlock(&ctl
->tree_lock
);
1956 /* no pre-allocated info, allocate a new one */
1958 info
= kmem_cache_zalloc(btrfs_free_space_cachep
,
1961 spin_lock(&ctl
->tree_lock
);
1967 /* allocate the bitmap */
1968 info
->bitmap
= kzalloc(PAGE_CACHE_SIZE
, GFP_NOFS
);
1969 spin_lock(&ctl
->tree_lock
);
1970 if (!info
->bitmap
) {
1980 kfree(info
->bitmap
);
1981 kmem_cache_free(btrfs_free_space_cachep
, info
);
1987 static bool try_merge_free_space(struct btrfs_free_space_ctl
*ctl
,
1988 struct btrfs_free_space
*info
, bool update_stat
)
1990 struct btrfs_free_space
*left_info
;
1991 struct btrfs_free_space
*right_info
;
1992 bool merged
= false;
1993 u64 offset
= info
->offset
;
1994 u64 bytes
= info
->bytes
;
1997 * first we want to see if there is free space adjacent to the range we
1998 * are adding, if there is remove that struct and add a new one to
1999 * cover the entire range
2001 right_info
= tree_search_offset(ctl
, offset
+ bytes
, 0, 0);
2002 if (right_info
&& rb_prev(&right_info
->offset_index
))
2003 left_info
= rb_entry(rb_prev(&right_info
->offset_index
),
2004 struct btrfs_free_space
, offset_index
);
2006 left_info
= tree_search_offset(ctl
, offset
- 1, 0, 0);
2008 if (right_info
&& !right_info
->bitmap
) {
2010 unlink_free_space(ctl
, right_info
);
2012 __unlink_free_space(ctl
, right_info
);
2013 info
->bytes
+= right_info
->bytes
;
2014 kmem_cache_free(btrfs_free_space_cachep
, right_info
);
2018 if (left_info
&& !left_info
->bitmap
&&
2019 left_info
->offset
+ left_info
->bytes
== offset
) {
2021 unlink_free_space(ctl
, left_info
);
2023 __unlink_free_space(ctl
, left_info
);
2024 info
->offset
= left_info
->offset
;
2025 info
->bytes
+= left_info
->bytes
;
2026 kmem_cache_free(btrfs_free_space_cachep
, left_info
);
2033 static bool steal_from_bitmap_to_end(struct btrfs_free_space_ctl
*ctl
,
2034 struct btrfs_free_space
*info
,
2037 struct btrfs_free_space
*bitmap
;
2040 const u64 end
= info
->offset
+ info
->bytes
;
2041 const u64 bitmap_offset
= offset_to_bitmap(ctl
, end
);
2044 bitmap
= tree_search_offset(ctl
, bitmap_offset
, 1, 0);
2048 i
= offset_to_bit(bitmap
->offset
, ctl
->unit
, end
);
2049 j
= find_next_zero_bit(bitmap
->bitmap
, BITS_PER_BITMAP
, i
);
2052 bytes
= (j
- i
) * ctl
->unit
;
2053 info
->bytes
+= bytes
;
2056 bitmap_clear_bits(ctl
, bitmap
, end
, bytes
);
2058 __bitmap_clear_bits(ctl
, bitmap
, end
, bytes
);
2061 free_bitmap(ctl
, bitmap
);
2066 static bool steal_from_bitmap_to_front(struct btrfs_free_space_ctl
*ctl
,
2067 struct btrfs_free_space
*info
,
2070 struct btrfs_free_space
*bitmap
;
2074 unsigned long prev_j
;
2077 bitmap_offset
= offset_to_bitmap(ctl
, info
->offset
);
2078 /* If we're on a boundary, try the previous logical bitmap. */
2079 if (bitmap_offset
== info
->offset
) {
2080 if (info
->offset
== 0)
2082 bitmap_offset
= offset_to_bitmap(ctl
, info
->offset
- 1);
2085 bitmap
= tree_search_offset(ctl
, bitmap_offset
, 1, 0);
2089 i
= offset_to_bit(bitmap
->offset
, ctl
->unit
, info
->offset
) - 1;
2091 prev_j
= (unsigned long)-1;
2092 for_each_clear_bit_from(j
, bitmap
->bitmap
, BITS_PER_BITMAP
) {
2100 if (prev_j
== (unsigned long)-1)
2101 bytes
= (i
+ 1) * ctl
->unit
;
2103 bytes
= (i
- prev_j
) * ctl
->unit
;
2105 info
->offset
-= bytes
;
2106 info
->bytes
+= bytes
;
2109 bitmap_clear_bits(ctl
, bitmap
, info
->offset
, bytes
);
2111 __bitmap_clear_bits(ctl
, bitmap
, info
->offset
, bytes
);
2114 free_bitmap(ctl
, bitmap
);
2120 * We prefer always to allocate from extent entries, both for clustered and
2121 * non-clustered allocation requests. So when attempting to add a new extent
2122 * entry, try to see if there's adjacent free space in bitmap entries, and if
2123 * there is, migrate that space from the bitmaps to the extent.
2124 * Like this we get better chances of satisfying space allocation requests
2125 * because we attempt to satisfy them based on a single cache entry, and never
2126 * on 2 or more entries - even if the entries represent a contiguous free space
2127 * region (e.g. 1 extent entry + 1 bitmap entry starting where the extent entry
2130 static void steal_from_bitmap(struct btrfs_free_space_ctl
*ctl
,
2131 struct btrfs_free_space
*info
,
2135 * Only work with disconnected entries, as we can change their offset,
2136 * and must be extent entries.
2138 ASSERT(!info
->bitmap
);
2139 ASSERT(RB_EMPTY_NODE(&info
->offset_index
));
2141 if (ctl
->total_bitmaps
> 0) {
2143 bool stole_front
= false;
2145 stole_end
= steal_from_bitmap_to_end(ctl
, info
, update_stat
);
2146 if (ctl
->total_bitmaps
> 0)
2147 stole_front
= steal_from_bitmap_to_front(ctl
, info
,
2150 if (stole_end
|| stole_front
)
2151 try_merge_free_space(ctl
, info
, update_stat
);
2155 int __btrfs_add_free_space(struct btrfs_free_space_ctl
*ctl
,
2156 u64 offset
, u64 bytes
)
2158 struct btrfs_free_space
*info
;
2161 info
= kmem_cache_zalloc(btrfs_free_space_cachep
, GFP_NOFS
);
2165 info
->offset
= offset
;
2166 info
->bytes
= bytes
;
2167 RB_CLEAR_NODE(&info
->offset_index
);
2169 spin_lock(&ctl
->tree_lock
);
2171 if (try_merge_free_space(ctl
, info
, true))
2175 * There was no extent directly to the left or right of this new
2176 * extent then we know we're going to have to allocate a new extent, so
2177 * before we do that see if we need to drop this into a bitmap
2179 ret
= insert_into_bitmap(ctl
, info
);
2188 * Only steal free space from adjacent bitmaps if we're sure we're not
2189 * going to add the new free space to existing bitmap entries - because
2190 * that would mean unnecessary work that would be reverted. Therefore
2191 * attempt to steal space from bitmaps if we're adding an extent entry.
2193 steal_from_bitmap(ctl
, info
, true);
2195 ret
= link_free_space(ctl
, info
);
2197 kmem_cache_free(btrfs_free_space_cachep
, info
);
2199 spin_unlock(&ctl
->tree_lock
);
2202 printk(KERN_CRIT
"BTRFS: unable to add free space :%d\n", ret
);
2203 ASSERT(ret
!= -EEXIST
);
2209 int btrfs_remove_free_space(struct btrfs_block_group_cache
*block_group
,
2210 u64 offset
, u64 bytes
)
2212 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2213 struct btrfs_free_space
*info
;
2215 bool re_search
= false;
2217 spin_lock(&ctl
->tree_lock
);
2224 info
= tree_search_offset(ctl
, offset
, 0, 0);
2227 * oops didn't find an extent that matched the space we wanted
2228 * to remove, look for a bitmap instead
2230 info
= tree_search_offset(ctl
, offset_to_bitmap(ctl
, offset
),
2234 * If we found a partial bit of our free space in a
2235 * bitmap but then couldn't find the other part this may
2236 * be a problem, so WARN about it.
2244 if (!info
->bitmap
) {
2245 unlink_free_space(ctl
, info
);
2246 if (offset
== info
->offset
) {
2247 u64 to_free
= min(bytes
, info
->bytes
);
2249 info
->bytes
-= to_free
;
2250 info
->offset
+= to_free
;
2252 ret
= link_free_space(ctl
, info
);
2255 kmem_cache_free(btrfs_free_space_cachep
, info
);
2262 u64 old_end
= info
->bytes
+ info
->offset
;
2264 info
->bytes
= offset
- info
->offset
;
2265 ret
= link_free_space(ctl
, info
);
2270 /* Not enough bytes in this entry to satisfy us */
2271 if (old_end
< offset
+ bytes
) {
2272 bytes
-= old_end
- offset
;
2275 } else if (old_end
== offset
+ bytes
) {
2279 spin_unlock(&ctl
->tree_lock
);
2281 ret
= btrfs_add_free_space(block_group
, offset
+ bytes
,
2282 old_end
- (offset
+ bytes
));
2288 ret
= remove_from_bitmap(ctl
, info
, &offset
, &bytes
);
2289 if (ret
== -EAGAIN
) {
2294 spin_unlock(&ctl
->tree_lock
);
2299 void btrfs_dump_free_space(struct btrfs_block_group_cache
*block_group
,
2302 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2303 struct btrfs_free_space
*info
;
2307 for (n
= rb_first(&ctl
->free_space_offset
); n
; n
= rb_next(n
)) {
2308 info
= rb_entry(n
, struct btrfs_free_space
, offset_index
);
2309 if (info
->bytes
>= bytes
&& !block_group
->ro
)
2311 btrfs_crit(block_group
->fs_info
,
2312 "entry offset %llu, bytes %llu, bitmap %s",
2313 info
->offset
, info
->bytes
,
2314 (info
->bitmap
) ? "yes" : "no");
2316 btrfs_info(block_group
->fs_info
, "block group has cluster?: %s",
2317 list_empty(&block_group
->cluster_list
) ? "no" : "yes");
2318 btrfs_info(block_group
->fs_info
,
2319 "%d blocks of free space at or bigger than bytes is", count
);
2322 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache
*block_group
)
2324 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2326 spin_lock_init(&ctl
->tree_lock
);
2327 ctl
->unit
= block_group
->sectorsize
;
2328 ctl
->start
= block_group
->key
.objectid
;
2329 ctl
->private = block_group
;
2330 ctl
->op
= &free_space_op
;
2331 INIT_LIST_HEAD(&ctl
->trimming_ranges
);
2332 mutex_init(&ctl
->cache_writeout_mutex
);
2335 * we only want to have 32k of ram per block group for keeping
2336 * track of free space, and if we pass 1/2 of that we want to
2337 * start converting things over to using bitmaps
2339 ctl
->extents_thresh
= ((1024 * 32) / 2) /
2340 sizeof(struct btrfs_free_space
);
2344 * for a given cluster, put all of its extents back into the free
2345 * space cache. If the block group passed doesn't match the block group
2346 * pointed to by the cluster, someone else raced in and freed the
2347 * cluster already. In that case, we just return without changing anything
2350 __btrfs_return_cluster_to_free_space(
2351 struct btrfs_block_group_cache
*block_group
,
2352 struct btrfs_free_cluster
*cluster
)
2354 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2355 struct btrfs_free_space
*entry
;
2356 struct rb_node
*node
;
2358 spin_lock(&cluster
->lock
);
2359 if (cluster
->block_group
!= block_group
)
2362 cluster
->block_group
= NULL
;
2363 cluster
->window_start
= 0;
2364 list_del_init(&cluster
->block_group_list
);
2366 node
= rb_first(&cluster
->root
);
2370 entry
= rb_entry(node
, struct btrfs_free_space
, offset_index
);
2371 node
= rb_next(&entry
->offset_index
);
2372 rb_erase(&entry
->offset_index
, &cluster
->root
);
2373 RB_CLEAR_NODE(&entry
->offset_index
);
2375 bitmap
= (entry
->bitmap
!= NULL
);
2377 try_merge_free_space(ctl
, entry
, false);
2378 steal_from_bitmap(ctl
, entry
, false);
2380 tree_insert_offset(&ctl
->free_space_offset
,
2381 entry
->offset
, &entry
->offset_index
, bitmap
);
2383 cluster
->root
= RB_ROOT
;
2386 spin_unlock(&cluster
->lock
);
2387 btrfs_put_block_group(block_group
);
2391 static void __btrfs_remove_free_space_cache_locked(
2392 struct btrfs_free_space_ctl
*ctl
)
2394 struct btrfs_free_space
*info
;
2395 struct rb_node
*node
;
2397 while ((node
= rb_last(&ctl
->free_space_offset
)) != NULL
) {
2398 info
= rb_entry(node
, struct btrfs_free_space
, offset_index
);
2399 if (!info
->bitmap
) {
2400 unlink_free_space(ctl
, info
);
2401 kmem_cache_free(btrfs_free_space_cachep
, info
);
2403 free_bitmap(ctl
, info
);
2405 if (need_resched()) {
2406 spin_unlock(&ctl
->tree_lock
);
2408 spin_lock(&ctl
->tree_lock
);
2413 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl
*ctl
)
2415 spin_lock(&ctl
->tree_lock
);
2416 __btrfs_remove_free_space_cache_locked(ctl
);
2417 spin_unlock(&ctl
->tree_lock
);
2420 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
*block_group
)
2422 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2423 struct btrfs_free_cluster
*cluster
;
2424 struct list_head
*head
;
2426 spin_lock(&ctl
->tree_lock
);
2427 while ((head
= block_group
->cluster_list
.next
) !=
2428 &block_group
->cluster_list
) {
2429 cluster
= list_entry(head
, struct btrfs_free_cluster
,
2432 WARN_ON(cluster
->block_group
!= block_group
);
2433 __btrfs_return_cluster_to_free_space(block_group
, cluster
);
2434 if (need_resched()) {
2435 spin_unlock(&ctl
->tree_lock
);
2437 spin_lock(&ctl
->tree_lock
);
2440 __btrfs_remove_free_space_cache_locked(ctl
);
2441 spin_unlock(&ctl
->tree_lock
);
2445 u64
btrfs_find_space_for_alloc(struct btrfs_block_group_cache
*block_group
,
2446 u64 offset
, u64 bytes
, u64 empty_size
,
2447 u64
*max_extent_size
)
2449 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2450 struct btrfs_free_space
*entry
= NULL
;
2451 u64 bytes_search
= bytes
+ empty_size
;
2454 u64 align_gap_len
= 0;
2456 spin_lock(&ctl
->tree_lock
);
2457 entry
= find_free_space(ctl
, &offset
, &bytes_search
,
2458 block_group
->full_stripe_len
, max_extent_size
);
2463 if (entry
->bitmap
) {
2464 bitmap_clear_bits(ctl
, entry
, offset
, bytes
);
2466 free_bitmap(ctl
, entry
);
2468 unlink_free_space(ctl
, entry
);
2469 align_gap_len
= offset
- entry
->offset
;
2470 align_gap
= entry
->offset
;
2472 entry
->offset
= offset
+ bytes
;
2473 WARN_ON(entry
->bytes
< bytes
+ align_gap_len
);
2475 entry
->bytes
-= bytes
+ align_gap_len
;
2477 kmem_cache_free(btrfs_free_space_cachep
, entry
);
2479 link_free_space(ctl
, entry
);
2482 spin_unlock(&ctl
->tree_lock
);
2485 __btrfs_add_free_space(ctl
, align_gap
, align_gap_len
);
2490 * given a cluster, put all of its extents back into the free space
2491 * cache. If a block group is passed, this function will only free
2492 * a cluster that belongs to the passed block group.
2494 * Otherwise, it'll get a reference on the block group pointed to by the
2495 * cluster and remove the cluster from it.
2497 int btrfs_return_cluster_to_free_space(
2498 struct btrfs_block_group_cache
*block_group
,
2499 struct btrfs_free_cluster
*cluster
)
2501 struct btrfs_free_space_ctl
*ctl
;
2504 /* first, get a safe pointer to the block group */
2505 spin_lock(&cluster
->lock
);
2507 block_group
= cluster
->block_group
;
2509 spin_unlock(&cluster
->lock
);
2512 } else if (cluster
->block_group
!= block_group
) {
2513 /* someone else has already freed it don't redo their work */
2514 spin_unlock(&cluster
->lock
);
2517 atomic_inc(&block_group
->count
);
2518 spin_unlock(&cluster
->lock
);
2520 ctl
= block_group
->free_space_ctl
;
2522 /* now return any extents the cluster had on it */
2523 spin_lock(&ctl
->tree_lock
);
2524 ret
= __btrfs_return_cluster_to_free_space(block_group
, cluster
);
2525 spin_unlock(&ctl
->tree_lock
);
2527 /* finally drop our ref */
2528 btrfs_put_block_group(block_group
);
2532 static u64
btrfs_alloc_from_bitmap(struct btrfs_block_group_cache
*block_group
,
2533 struct btrfs_free_cluster
*cluster
,
2534 struct btrfs_free_space
*entry
,
2535 u64 bytes
, u64 min_start
,
2536 u64
*max_extent_size
)
2538 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2540 u64 search_start
= cluster
->window_start
;
2541 u64 search_bytes
= bytes
;
2544 search_start
= min_start
;
2545 search_bytes
= bytes
;
2547 err
= search_bitmap(ctl
, entry
, &search_start
, &search_bytes
);
2549 if (search_bytes
> *max_extent_size
)
2550 *max_extent_size
= search_bytes
;
2555 __bitmap_clear_bits(ctl
, entry
, ret
, bytes
);
2561 * given a cluster, try to allocate 'bytes' from it, returns 0
2562 * if it couldn't find anything suitably large, or a logical disk offset
2563 * if things worked out
2565 u64
btrfs_alloc_from_cluster(struct btrfs_block_group_cache
*block_group
,
2566 struct btrfs_free_cluster
*cluster
, u64 bytes
,
2567 u64 min_start
, u64
*max_extent_size
)
2569 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2570 struct btrfs_free_space
*entry
= NULL
;
2571 struct rb_node
*node
;
2574 spin_lock(&cluster
->lock
);
2575 if (bytes
> cluster
->max_size
)
2578 if (cluster
->block_group
!= block_group
)
2581 node
= rb_first(&cluster
->root
);
2585 entry
= rb_entry(node
, struct btrfs_free_space
, offset_index
);
2587 if (entry
->bytes
< bytes
&& entry
->bytes
> *max_extent_size
)
2588 *max_extent_size
= entry
->bytes
;
2590 if (entry
->bytes
< bytes
||
2591 (!entry
->bitmap
&& entry
->offset
< min_start
)) {
2592 node
= rb_next(&entry
->offset_index
);
2595 entry
= rb_entry(node
, struct btrfs_free_space
,
2600 if (entry
->bitmap
) {
2601 ret
= btrfs_alloc_from_bitmap(block_group
,
2602 cluster
, entry
, bytes
,
2603 cluster
->window_start
,
2606 node
= rb_next(&entry
->offset_index
);
2609 entry
= rb_entry(node
, struct btrfs_free_space
,
2613 cluster
->window_start
+= bytes
;
2615 ret
= entry
->offset
;
2617 entry
->offset
+= bytes
;
2618 entry
->bytes
-= bytes
;
2621 if (entry
->bytes
== 0)
2622 rb_erase(&entry
->offset_index
, &cluster
->root
);
2626 spin_unlock(&cluster
->lock
);
2631 spin_lock(&ctl
->tree_lock
);
2633 ctl
->free_space
-= bytes
;
2634 if (entry
->bytes
== 0) {
2635 ctl
->free_extents
--;
2636 if (entry
->bitmap
) {
2637 kfree(entry
->bitmap
);
2638 ctl
->total_bitmaps
--;
2639 ctl
->op
->recalc_thresholds(ctl
);
2641 kmem_cache_free(btrfs_free_space_cachep
, entry
);
2644 spin_unlock(&ctl
->tree_lock
);
2649 static int btrfs_bitmap_cluster(struct btrfs_block_group_cache
*block_group
,
2650 struct btrfs_free_space
*entry
,
2651 struct btrfs_free_cluster
*cluster
,
2652 u64 offset
, u64 bytes
,
2653 u64 cont1_bytes
, u64 min_bytes
)
2655 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2656 unsigned long next_zero
;
2658 unsigned long want_bits
;
2659 unsigned long min_bits
;
2660 unsigned long found_bits
;
2661 unsigned long start
= 0;
2662 unsigned long total_found
= 0;
2665 i
= offset_to_bit(entry
->offset
, ctl
->unit
,
2666 max_t(u64
, offset
, entry
->offset
));
2667 want_bits
= bytes_to_bits(bytes
, ctl
->unit
);
2668 min_bits
= bytes_to_bits(min_bytes
, ctl
->unit
);
2672 for_each_set_bit_from(i
, entry
->bitmap
, BITS_PER_BITMAP
) {
2673 next_zero
= find_next_zero_bit(entry
->bitmap
,
2674 BITS_PER_BITMAP
, i
);
2675 if (next_zero
- i
>= min_bits
) {
2676 found_bits
= next_zero
- i
;
2687 cluster
->max_size
= 0;
2690 total_found
+= found_bits
;
2692 if (cluster
->max_size
< found_bits
* ctl
->unit
)
2693 cluster
->max_size
= found_bits
* ctl
->unit
;
2695 if (total_found
< want_bits
|| cluster
->max_size
< cont1_bytes
) {
2700 cluster
->window_start
= start
* ctl
->unit
+ entry
->offset
;
2701 rb_erase(&entry
->offset_index
, &ctl
->free_space_offset
);
2702 ret
= tree_insert_offset(&cluster
->root
, entry
->offset
,
2703 &entry
->offset_index
, 1);
2704 ASSERT(!ret
); /* -EEXIST; Logic error */
2706 trace_btrfs_setup_cluster(block_group
, cluster
,
2707 total_found
* ctl
->unit
, 1);
2712 * This searches the block group for just extents to fill the cluster with.
2713 * Try to find a cluster with at least bytes total bytes, at least one
2714 * extent of cont1_bytes, and other clusters of at least min_bytes.
2717 setup_cluster_no_bitmap(struct btrfs_block_group_cache
*block_group
,
2718 struct btrfs_free_cluster
*cluster
,
2719 struct list_head
*bitmaps
, u64 offset
, u64 bytes
,
2720 u64 cont1_bytes
, u64 min_bytes
)
2722 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2723 struct btrfs_free_space
*first
= NULL
;
2724 struct btrfs_free_space
*entry
= NULL
;
2725 struct btrfs_free_space
*last
;
2726 struct rb_node
*node
;
2731 entry
= tree_search_offset(ctl
, offset
, 0, 1);
2736 * We don't want bitmaps, so just move along until we find a normal
2739 while (entry
->bitmap
|| entry
->bytes
< min_bytes
) {
2740 if (entry
->bitmap
&& list_empty(&entry
->list
))
2741 list_add_tail(&entry
->list
, bitmaps
);
2742 node
= rb_next(&entry
->offset_index
);
2745 entry
= rb_entry(node
, struct btrfs_free_space
, offset_index
);
2748 window_free
= entry
->bytes
;
2749 max_extent
= entry
->bytes
;
2753 for (node
= rb_next(&entry
->offset_index
); node
;
2754 node
= rb_next(&entry
->offset_index
)) {
2755 entry
= rb_entry(node
, struct btrfs_free_space
, offset_index
);
2757 if (entry
->bitmap
) {
2758 if (list_empty(&entry
->list
))
2759 list_add_tail(&entry
->list
, bitmaps
);
2763 if (entry
->bytes
< min_bytes
)
2767 window_free
+= entry
->bytes
;
2768 if (entry
->bytes
> max_extent
)
2769 max_extent
= entry
->bytes
;
2772 if (window_free
< bytes
|| max_extent
< cont1_bytes
)
2775 cluster
->window_start
= first
->offset
;
2777 node
= &first
->offset_index
;
2780 * now we've found our entries, pull them out of the free space
2781 * cache and put them into the cluster rbtree
2786 entry
= rb_entry(node
, struct btrfs_free_space
, offset_index
);
2787 node
= rb_next(&entry
->offset_index
);
2788 if (entry
->bitmap
|| entry
->bytes
< min_bytes
)
2791 rb_erase(&entry
->offset_index
, &ctl
->free_space_offset
);
2792 ret
= tree_insert_offset(&cluster
->root
, entry
->offset
,
2793 &entry
->offset_index
, 0);
2794 total_size
+= entry
->bytes
;
2795 ASSERT(!ret
); /* -EEXIST; Logic error */
2796 } while (node
&& entry
!= last
);
2798 cluster
->max_size
= max_extent
;
2799 trace_btrfs_setup_cluster(block_group
, cluster
, total_size
, 0);
2804 * This specifically looks for bitmaps that may work in the cluster, we assume
2805 * that we have already failed to find extents that will work.
2808 setup_cluster_bitmap(struct btrfs_block_group_cache
*block_group
,
2809 struct btrfs_free_cluster
*cluster
,
2810 struct list_head
*bitmaps
, u64 offset
, u64 bytes
,
2811 u64 cont1_bytes
, u64 min_bytes
)
2813 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2814 struct btrfs_free_space
*entry
;
2816 u64 bitmap_offset
= offset_to_bitmap(ctl
, offset
);
2818 if (ctl
->total_bitmaps
== 0)
2822 * The bitmap that covers offset won't be in the list unless offset
2823 * is just its start offset.
2825 entry
= list_first_entry(bitmaps
, struct btrfs_free_space
, list
);
2826 if (entry
->offset
!= bitmap_offset
) {
2827 entry
= tree_search_offset(ctl
, bitmap_offset
, 1, 0);
2828 if (entry
&& list_empty(&entry
->list
))
2829 list_add(&entry
->list
, bitmaps
);
2832 list_for_each_entry(entry
, bitmaps
, list
) {
2833 if (entry
->bytes
< bytes
)
2835 ret
= btrfs_bitmap_cluster(block_group
, entry
, cluster
, offset
,
2836 bytes
, cont1_bytes
, min_bytes
);
2842 * The bitmaps list has all the bitmaps that record free space
2843 * starting after offset, so no more search is required.
2849 * here we try to find a cluster of blocks in a block group. The goal
2850 * is to find at least bytes+empty_size.
2851 * We might not find them all in one contiguous area.
2853 * returns zero and sets up cluster if things worked out, otherwise
2854 * it returns -enospc
2856 int btrfs_find_space_cluster(struct btrfs_root
*root
,
2857 struct btrfs_block_group_cache
*block_group
,
2858 struct btrfs_free_cluster
*cluster
,
2859 u64 offset
, u64 bytes
, u64 empty_size
)
2861 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2862 struct btrfs_free_space
*entry
, *tmp
;
2869 * Choose the minimum extent size we'll require for this
2870 * cluster. For SSD_SPREAD, don't allow any fragmentation.
2871 * For metadata, allow allocates with smaller extents. For
2872 * data, keep it dense.
2874 if (btrfs_test_opt(root
, SSD_SPREAD
)) {
2875 cont1_bytes
= min_bytes
= bytes
+ empty_size
;
2876 } else if (block_group
->flags
& BTRFS_BLOCK_GROUP_METADATA
) {
2877 cont1_bytes
= bytes
;
2878 min_bytes
= block_group
->sectorsize
;
2880 cont1_bytes
= max(bytes
, (bytes
+ empty_size
) >> 2);
2881 min_bytes
= block_group
->sectorsize
;
2884 spin_lock(&ctl
->tree_lock
);
2887 * If we know we don't have enough space to make a cluster don't even
2888 * bother doing all the work to try and find one.
2890 if (ctl
->free_space
< bytes
) {
2891 spin_unlock(&ctl
->tree_lock
);
2895 spin_lock(&cluster
->lock
);
2897 /* someone already found a cluster, hooray */
2898 if (cluster
->block_group
) {
2903 trace_btrfs_find_cluster(block_group
, offset
, bytes
, empty_size
,
2906 ret
= setup_cluster_no_bitmap(block_group
, cluster
, &bitmaps
, offset
,
2908 cont1_bytes
, min_bytes
);
2910 ret
= setup_cluster_bitmap(block_group
, cluster
, &bitmaps
,
2911 offset
, bytes
+ empty_size
,
2912 cont1_bytes
, min_bytes
);
2914 /* Clear our temporary list */
2915 list_for_each_entry_safe(entry
, tmp
, &bitmaps
, list
)
2916 list_del_init(&entry
->list
);
2919 atomic_inc(&block_group
->count
);
2920 list_add_tail(&cluster
->block_group_list
,
2921 &block_group
->cluster_list
);
2922 cluster
->block_group
= block_group
;
2924 trace_btrfs_failed_cluster_setup(block_group
);
2927 spin_unlock(&cluster
->lock
);
2928 spin_unlock(&ctl
->tree_lock
);
2934 * simple code to zero out a cluster
2936 void btrfs_init_free_cluster(struct btrfs_free_cluster
*cluster
)
2938 spin_lock_init(&cluster
->lock
);
2939 spin_lock_init(&cluster
->refill_lock
);
2940 cluster
->root
= RB_ROOT
;
2941 cluster
->max_size
= 0;
2942 INIT_LIST_HEAD(&cluster
->block_group_list
);
2943 cluster
->block_group
= NULL
;
2946 static int do_trimming(struct btrfs_block_group_cache
*block_group
,
2947 u64
*total_trimmed
, u64 start
, u64 bytes
,
2948 u64 reserved_start
, u64 reserved_bytes
,
2949 struct btrfs_trim_range
*trim_entry
)
2951 struct btrfs_space_info
*space_info
= block_group
->space_info
;
2952 struct btrfs_fs_info
*fs_info
= block_group
->fs_info
;
2953 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2958 spin_lock(&space_info
->lock
);
2959 spin_lock(&block_group
->lock
);
2960 if (!block_group
->ro
) {
2961 block_group
->reserved
+= reserved_bytes
;
2962 space_info
->bytes_reserved
+= reserved_bytes
;
2965 spin_unlock(&block_group
->lock
);
2966 spin_unlock(&space_info
->lock
);
2968 ret
= btrfs_discard_extent(fs_info
->extent_root
,
2969 start
, bytes
, &trimmed
);
2971 *total_trimmed
+= trimmed
;
2973 mutex_lock(&ctl
->cache_writeout_mutex
);
2974 btrfs_add_free_space(block_group
, reserved_start
, reserved_bytes
);
2975 list_del(&trim_entry
->list
);
2976 mutex_unlock(&ctl
->cache_writeout_mutex
);
2979 spin_lock(&space_info
->lock
);
2980 spin_lock(&block_group
->lock
);
2981 if (block_group
->ro
)
2982 space_info
->bytes_readonly
+= reserved_bytes
;
2983 block_group
->reserved
-= reserved_bytes
;
2984 space_info
->bytes_reserved
-= reserved_bytes
;
2985 spin_unlock(&space_info
->lock
);
2986 spin_unlock(&block_group
->lock
);
2992 static int trim_no_bitmap(struct btrfs_block_group_cache
*block_group
,
2993 u64
*total_trimmed
, u64 start
, u64 end
, u64 minlen
)
2995 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
2996 struct btrfs_free_space
*entry
;
2997 struct rb_node
*node
;
3003 while (start
< end
) {
3004 struct btrfs_trim_range trim_entry
;
3006 mutex_lock(&ctl
->cache_writeout_mutex
);
3007 spin_lock(&ctl
->tree_lock
);
3009 if (ctl
->free_space
< minlen
) {
3010 spin_unlock(&ctl
->tree_lock
);
3011 mutex_unlock(&ctl
->cache_writeout_mutex
);
3015 entry
= tree_search_offset(ctl
, start
, 0, 1);
3017 spin_unlock(&ctl
->tree_lock
);
3018 mutex_unlock(&ctl
->cache_writeout_mutex
);
3023 while (entry
->bitmap
) {
3024 node
= rb_next(&entry
->offset_index
);
3026 spin_unlock(&ctl
->tree_lock
);
3027 mutex_unlock(&ctl
->cache_writeout_mutex
);
3030 entry
= rb_entry(node
, struct btrfs_free_space
,
3034 if (entry
->offset
>= end
) {
3035 spin_unlock(&ctl
->tree_lock
);
3036 mutex_unlock(&ctl
->cache_writeout_mutex
);
3040 extent_start
= entry
->offset
;
3041 extent_bytes
= entry
->bytes
;
3042 start
= max(start
, extent_start
);
3043 bytes
= min(extent_start
+ extent_bytes
, end
) - start
;
3044 if (bytes
< minlen
) {
3045 spin_unlock(&ctl
->tree_lock
);
3046 mutex_unlock(&ctl
->cache_writeout_mutex
);
3050 unlink_free_space(ctl
, entry
);
3051 kmem_cache_free(btrfs_free_space_cachep
, entry
);
3053 spin_unlock(&ctl
->tree_lock
);
3054 trim_entry
.start
= extent_start
;
3055 trim_entry
.bytes
= extent_bytes
;
3056 list_add_tail(&trim_entry
.list
, &ctl
->trimming_ranges
);
3057 mutex_unlock(&ctl
->cache_writeout_mutex
);
3059 ret
= do_trimming(block_group
, total_trimmed
, start
, bytes
,
3060 extent_start
, extent_bytes
, &trim_entry
);
3066 if (fatal_signal_pending(current
)) {
3077 static int trim_bitmaps(struct btrfs_block_group_cache
*block_group
,
3078 u64
*total_trimmed
, u64 start
, u64 end
, u64 minlen
)
3080 struct btrfs_free_space_ctl
*ctl
= block_group
->free_space_ctl
;
3081 struct btrfs_free_space
*entry
;
3085 u64 offset
= offset_to_bitmap(ctl
, start
);
3087 while (offset
< end
) {
3088 bool next_bitmap
= false;
3089 struct btrfs_trim_range trim_entry
;
3091 mutex_lock(&ctl
->cache_writeout_mutex
);
3092 spin_lock(&ctl
->tree_lock
);
3094 if (ctl
->free_space
< minlen
) {
3095 spin_unlock(&ctl
->tree_lock
);
3096 mutex_unlock(&ctl
->cache_writeout_mutex
);
3100 entry
= tree_search_offset(ctl
, offset
, 1, 0);
3102 spin_unlock(&ctl
->tree_lock
);
3103 mutex_unlock(&ctl
->cache_writeout_mutex
);
3109 ret2
= search_bitmap(ctl
, entry
, &start
, &bytes
);
3110 if (ret2
|| start
>= end
) {
3111 spin_unlock(&ctl
->tree_lock
);
3112 mutex_unlock(&ctl
->cache_writeout_mutex
);
3117 bytes
= min(bytes
, end
- start
);
3118 if (bytes
< minlen
) {
3119 spin_unlock(&ctl
->tree_lock
);
3120 mutex_unlock(&ctl
->cache_writeout_mutex
);
3124 bitmap_clear_bits(ctl
, entry
, start
, bytes
);
3125 if (entry
->bytes
== 0)
3126 free_bitmap(ctl
, entry
);
3128 spin_unlock(&ctl
->tree_lock
);
3129 trim_entry
.start
= start
;
3130 trim_entry
.bytes
= bytes
;
3131 list_add_tail(&trim_entry
.list
, &ctl
->trimming_ranges
);
3132 mutex_unlock(&ctl
->cache_writeout_mutex
);
3134 ret
= do_trimming(block_group
, total_trimmed
, start
, bytes
,
3135 start
, bytes
, &trim_entry
);
3140 offset
+= BITS_PER_BITMAP
* ctl
->unit
;
3143 if (start
>= offset
+ BITS_PER_BITMAP
* ctl
->unit
)
3144 offset
+= BITS_PER_BITMAP
* ctl
->unit
;
3147 if (fatal_signal_pending(current
)) {
3158 int btrfs_trim_block_group(struct btrfs_block_group_cache
*block_group
,
3159 u64
*trimmed
, u64 start
, u64 end
, u64 minlen
)
3165 spin_lock(&block_group
->lock
);
3166 if (block_group
->removed
) {
3167 spin_unlock(&block_group
->lock
);
3170 atomic_inc(&block_group
->trimming
);
3171 spin_unlock(&block_group
->lock
);
3173 ret
= trim_no_bitmap(block_group
, trimmed
, start
, end
, minlen
);
3177 ret
= trim_bitmaps(block_group
, trimmed
, start
, end
, minlen
);
3179 spin_lock(&block_group
->lock
);
3180 if (atomic_dec_and_test(&block_group
->trimming
) &&
3181 block_group
->removed
) {
3182 struct extent_map_tree
*em_tree
;
3183 struct extent_map
*em
;
3185 spin_unlock(&block_group
->lock
);
3187 lock_chunks(block_group
->fs_info
->chunk_root
);
3188 em_tree
= &block_group
->fs_info
->mapping_tree
.map_tree
;
3189 write_lock(&em_tree
->lock
);
3190 em
= lookup_extent_mapping(em_tree
, block_group
->key
.objectid
,
3192 BUG_ON(!em
); /* logic error, can't happen */
3194 * remove_extent_mapping() will delete us from the pinned_chunks
3195 * list, which is protected by the chunk mutex.
3197 remove_extent_mapping(em_tree
, em
);
3198 write_unlock(&em_tree
->lock
);
3199 unlock_chunks(block_group
->fs_info
->chunk_root
);
3201 /* once for us and once for the tree */
3202 free_extent_map(em
);
3203 free_extent_map(em
);
3206 * We've left one free space entry and other tasks trimming
3207 * this block group have left 1 entry each one. Free them.
3209 __btrfs_remove_free_space_cache(block_group
->free_space_ctl
);
3211 spin_unlock(&block_group
->lock
);
3218 * Find the left-most item in the cache tree, and then return the
3219 * smallest inode number in the item.
3221 * Note: the returned inode number may not be the smallest one in
3222 * the tree, if the left-most item is a bitmap.
3224 u64
btrfs_find_ino_for_alloc(struct btrfs_root
*fs_root
)
3226 struct btrfs_free_space_ctl
*ctl
= fs_root
->free_ino_ctl
;
3227 struct btrfs_free_space
*entry
= NULL
;
3230 spin_lock(&ctl
->tree_lock
);
3232 if (RB_EMPTY_ROOT(&ctl
->free_space_offset
))
3235 entry
= rb_entry(rb_first(&ctl
->free_space_offset
),
3236 struct btrfs_free_space
, offset_index
);
3238 if (!entry
->bitmap
) {
3239 ino
= entry
->offset
;
3241 unlink_free_space(ctl
, entry
);
3245 kmem_cache_free(btrfs_free_space_cachep
, entry
);
3247 link_free_space(ctl
, entry
);
3253 ret
= search_bitmap(ctl
, entry
, &offset
, &count
);
3254 /* Logic error; Should be empty if it can't find anything */
3258 bitmap_clear_bits(ctl
, entry
, offset
, 1);
3259 if (entry
->bytes
== 0)
3260 free_bitmap(ctl
, entry
);
3263 spin_unlock(&ctl
->tree_lock
);
3268 struct inode
*lookup_free_ino_inode(struct btrfs_root
*root
,
3269 struct btrfs_path
*path
)
3271 struct inode
*inode
= NULL
;
3273 spin_lock(&root
->ino_cache_lock
);
3274 if (root
->ino_cache_inode
)
3275 inode
= igrab(root
->ino_cache_inode
);
3276 spin_unlock(&root
->ino_cache_lock
);
3280 inode
= __lookup_free_space_inode(root
, path
, 0);
3284 spin_lock(&root
->ino_cache_lock
);
3285 if (!btrfs_fs_closing(root
->fs_info
))
3286 root
->ino_cache_inode
= igrab(inode
);
3287 spin_unlock(&root
->ino_cache_lock
);
3292 int create_free_ino_inode(struct btrfs_root
*root
,
3293 struct btrfs_trans_handle
*trans
,
3294 struct btrfs_path
*path
)
3296 return __create_free_space_inode(root
, trans
, path
,
3297 BTRFS_FREE_INO_OBJECTID
, 0);
3300 int load_free_ino_cache(struct btrfs_fs_info
*fs_info
, struct btrfs_root
*root
)
3302 struct btrfs_free_space_ctl
*ctl
= root
->free_ino_ctl
;
3303 struct btrfs_path
*path
;
3304 struct inode
*inode
;
3306 u64 root_gen
= btrfs_root_generation(&root
->root_item
);
3308 if (!btrfs_test_opt(root
, INODE_MAP_CACHE
))
3312 * If we're unmounting then just return, since this does a search on the
3313 * normal root and not the commit root and we could deadlock.
3315 if (btrfs_fs_closing(fs_info
))
3318 path
= btrfs_alloc_path();
3322 inode
= lookup_free_ino_inode(root
, path
);
3326 if (root_gen
!= BTRFS_I(inode
)->generation
)
3329 ret
= __load_free_space_cache(root
, inode
, ctl
, path
, 0);
3333 "failed to load free ino cache for root %llu",
3334 root
->root_key
.objectid
);
3338 btrfs_free_path(path
);
3342 int btrfs_write_out_ino_cache(struct btrfs_root
*root
,
3343 struct btrfs_trans_handle
*trans
,
3344 struct btrfs_path
*path
,
3345 struct inode
*inode
)
3347 struct btrfs_free_space_ctl
*ctl
= root
->free_ino_ctl
;
3350 if (!btrfs_test_opt(root
, INODE_MAP_CACHE
))
3353 ret
= __btrfs_write_out_cache(root
, inode
, ctl
, NULL
, trans
, path
, 0);
3355 btrfs_delalloc_release_metadata(inode
, inode
->i_size
);
3357 btrfs_err(root
->fs_info
,
3358 "failed to write free ino cache for root %llu",
3359 root
->root_key
.objectid
);
3366 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3368 * Use this if you need to make a bitmap or extent entry specifically, it
3369 * doesn't do any of the merging that add_free_space does, this acts a lot like
3370 * how the free space cache loading stuff works, so you can get really weird
3373 int test_add_free_space_entry(struct btrfs_block_group_cache
*cache
,
3374 u64 offset
, u64 bytes
, bool bitmap
)
3376 struct btrfs_free_space_ctl
*ctl
= cache
->free_space_ctl
;
3377 struct btrfs_free_space
*info
= NULL
, *bitmap_info
;
3384 info
= kmem_cache_zalloc(btrfs_free_space_cachep
, GFP_NOFS
);
3390 spin_lock(&ctl
->tree_lock
);
3391 info
->offset
= offset
;
3392 info
->bytes
= bytes
;
3393 ret
= link_free_space(ctl
, info
);
3394 spin_unlock(&ctl
->tree_lock
);
3396 kmem_cache_free(btrfs_free_space_cachep
, info
);
3401 map
= kzalloc(PAGE_CACHE_SIZE
, GFP_NOFS
);
3403 kmem_cache_free(btrfs_free_space_cachep
, info
);
3408 spin_lock(&ctl
->tree_lock
);
3409 bitmap_info
= tree_search_offset(ctl
, offset_to_bitmap(ctl
, offset
),
3414 add_new_bitmap(ctl
, info
, offset
);
3419 bytes_added
= add_bytes_to_bitmap(ctl
, bitmap_info
, offset
, bytes
);
3420 bytes
-= bytes_added
;
3421 offset
+= bytes_added
;
3422 spin_unlock(&ctl
->tree_lock
);
3428 kmem_cache_free(btrfs_free_space_cachep
, info
);
3435 * Checks to see if the given range is in the free space cache. This is really
3436 * just used to check the absence of space, so if there is free space in the
3437 * range at all we will return 1.
3439 int test_check_exists(struct btrfs_block_group_cache
*cache
,
3440 u64 offset
, u64 bytes
)
3442 struct btrfs_free_space_ctl
*ctl
= cache
->free_space_ctl
;
3443 struct btrfs_free_space
*info
;
3446 spin_lock(&ctl
->tree_lock
);
3447 info
= tree_search_offset(ctl
, offset
, 0, 0);
3449 info
= tree_search_offset(ctl
, offset_to_bitmap(ctl
, offset
),
3457 u64 bit_off
, bit_bytes
;
3459 struct btrfs_free_space
*tmp
;
3462 bit_bytes
= ctl
->unit
;
3463 ret
= search_bitmap(ctl
, info
, &bit_off
, &bit_bytes
);
3465 if (bit_off
== offset
) {
3468 } else if (bit_off
> offset
&&
3469 offset
+ bytes
> bit_off
) {
3475 n
= rb_prev(&info
->offset_index
);
3477 tmp
= rb_entry(n
, struct btrfs_free_space
,
3479 if (tmp
->offset
+ tmp
->bytes
< offset
)
3481 if (offset
+ bytes
< tmp
->offset
) {
3482 n
= rb_prev(&info
->offset_index
);
3489 n
= rb_next(&info
->offset_index
);
3491 tmp
= rb_entry(n
, struct btrfs_free_space
,
3493 if (offset
+ bytes
< tmp
->offset
)
3495 if (tmp
->offset
+ tmp
->bytes
< offset
) {
3496 n
= rb_next(&info
->offset_index
);
3507 if (info
->offset
== offset
) {
3512 if (offset
> info
->offset
&& offset
< info
->offset
+ info
->bytes
)
3515 spin_unlock(&ctl
->tree_lock
);
3518 #endif /* CONFIG_BTRFS_FS_RUN_SANITY_TESTS */