d28625867f7631b07f29160bb97859c165f24b72
[platform/upstream/btrfs-progs.git] / free-space-cache.h
1 /*
2  * Copyright (C) 2009 Oracle.  All rights reserved.
3  *
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.
7  *
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.
12  *
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.
17  */
18
19 #ifndef __BTRFS_FREE_SPACE_CACHE
20 #define __BTRFS_FREE_SPACE_CACHE
21
22 struct btrfs_free_space {
23         struct rb_node offset_index;
24         u64 offset;
25         u64 bytes;
26         unsigned long *bitmap;
27         struct list_head list;
28 };
29
30 struct btrfs_free_space_ctl {
31         struct rb_root free_space_offset;
32         u64 free_space;
33         int extents_thresh;
34         int free_extents;
35         int total_bitmaps;
36         int unit;
37         u64 start;
38         void *private;
39 };
40
41 int load_free_space_cache(struct btrfs_fs_info *fs_info,
42                           struct btrfs_block_group_cache *block_group);
43
44 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
45 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
46                                      *block_group);
47 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
48                            u64 bytes);
49 struct btrfs_free_space *
50 btrfs_find_free_space(struct btrfs_free_space_ctl *ctl, u64 offset, u64 bytes);
51 int btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group,
52                               int sectorsize);
53 void unlink_free_space(struct btrfs_free_space_ctl *ctl,
54                        struct btrfs_free_space *info);
55 #endif