Btrfs: create special free space cache inode
[linux-3.10.git] / fs / btrfs / 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 inode *lookup_free_space_inode(struct btrfs_root *root,
31                                       struct btrfs_block_group_cache
32                                       *block_group, struct btrfs_path *path);
33 int create_free_space_inode(struct btrfs_root *root,
34                             struct btrfs_trans_handle *trans,
35                             struct btrfs_block_group_cache *block_group,
36                             struct btrfs_path *path);
37 int btrfs_truncate_free_space_cache(struct btrfs_root *root,
38                                     struct btrfs_trans_handle *trans,
39                                     struct btrfs_path *path,
40                                     struct inode *inode);
41 int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
42                          u64 bytenr, u64 size);
43 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
44                             u64 bytenr, u64 size);
45 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
46                                    *block_group);
47 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
48                                u64 offset, u64 bytes, u64 empty_size);
49 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
50                            u64 bytes);
51 u64 btrfs_block_group_free_space(struct btrfs_block_group_cache *block_group);
52 int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
53                              struct btrfs_root *root,
54                              struct btrfs_block_group_cache *block_group,
55                              struct btrfs_free_cluster *cluster,
56                              u64 offset, u64 bytes, u64 empty_size);
57 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
58 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
59                              struct btrfs_free_cluster *cluster, u64 bytes,
60                              u64 min_start);
61 int btrfs_return_cluster_to_free_space(
62                                struct btrfs_block_group_cache *block_group,
63                                struct btrfs_free_cluster *cluster);
64 #endif