Root/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
22struct 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
30int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
31             u64 bytenr, u64 size);
32int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
33                u64 bytenr, u64 size);
34void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
35                   *block_group);
36u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
37                   u64 offset, u64 bytes, u64 empty_size);
38void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
39               u64 bytes);
40u64 btrfs_block_group_free_space(struct btrfs_block_group_cache *block_group);
41int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
42                 struct btrfs_root *root,
43                 struct btrfs_block_group_cache *block_group,
44                 struct btrfs_free_cluster *cluster,
45                 u64 offset, u64 bytes, u64 empty_size);
46void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
47u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
48                 struct btrfs_free_cluster *cluster, u64 bytes,
49                 u64 min_start);
50int btrfs_return_cluster_to_free_space(
51                   struct btrfs_block_group_cache *block_group,
52                   struct btrfs_free_cluster *cluster);
53#endif
54

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