Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6.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
38 int btrfs_truncate_free_space_cache(struct btrfs_root *root,
39                                     struct btrfs_trans_handle *trans,
40                                     struct btrfs_path *path,
41                                     struct inode *inode);
42 int load_free_space_cache(struct btrfs_fs_info *fs_info,
43                           struct btrfs_block_group_cache *block_group);
44 int btrfs_write_out_cache(struct btrfs_root *root,
45                           struct btrfs_trans_handle *trans,
46                           struct btrfs_block_group_cache *block_group,
47                           struct btrfs_path *path);
48 int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
49                          u64 bytenr, u64 size);
50 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
51                             u64 bytenr, u64 size);
52 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
53                                    *block_group);
54 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
55                                u64 offset, u64 bytes, u64 empty_size);
56 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
57                            u64 bytes);
58 u64 btrfs_block_group_free_space(struct btrfs_block_group_cache *block_group);
59 int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
60                              struct btrfs_root *root,
61                              struct btrfs_block_group_cache *block_group,
62                              struct btrfs_free_cluster *cluster,
63                              u64 offset, u64 bytes, u64 empty_size);
64 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
65 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
66                              struct btrfs_free_cluster *cluster, u64 bytes,
67                              u64 min_start);
68 int btrfs_return_cluster_to_free_space(
69                                struct btrfs_block_group_cache *block_group,
70                                struct btrfs_free_cluster *cluster);
71 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
72                            u64 *trimmed, u64 start, u64 end, u64 minlen);
73 #endif