btrfs-progs: docs: mkfs, implications of DUP on devices
[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_H__
20 #define __BTRFS_FREE_SPACE_CACHE_H__
21
22 #include "kerncompat.h"
23 #include "ctree.h"
24 #include "rbtree.h"
25
26 struct btrfs_free_space {
27         struct rb_node offset_index;
28         u64 offset;
29         u64 bytes;
30         unsigned long *bitmap;
31         struct list_head list;
32 };
33
34 struct btrfs_free_space_ctl {
35         struct rb_root free_space_offset;
36         u64 free_space;
37         int extents_thresh;
38         int free_extents;
39         int total_bitmaps;
40         int unit;
41         u64 start;
42         void *private;
43         u32 sectorsize;
44 };
45
46 int load_free_space_cache(struct btrfs_fs_info *fs_info,
47                           struct btrfs_block_group_cache *block_group);
48
49 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
50 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
51                                      *block_group);
52 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
53                            u64 bytes);
54 struct btrfs_free_space *
55 btrfs_find_free_space(struct btrfs_free_space_ctl *ctl, u64 offset, u64 bytes);
56 int btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group,
57                               int sectorsize);
58 void unlink_free_space(struct btrfs_free_space_ctl *ctl,
59                        struct btrfs_free_space *info);
60 #endif