2 * Copyright (C) 2009 Oracle. All rights reserved.
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.
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.
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.
19 #ifndef __BTRFS_FREE_SPACE_CACHE
20 #define __BTRFS_FREE_SPACE_CACHE
22 struct btrfs_free_space
{
23 struct rb_node offset_index
;
26 unsigned long *bitmap
;
27 struct list_head list
;
30 struct btrfs_free_space_ctl
{
32 struct rb_root free_space_offset
;
39 struct btrfs_free_space_op
*op
;
41 struct mutex cache_writeout_mutex
;
42 struct list_head trimming_ranges
;
45 struct btrfs_free_space_op
{
46 void (*recalc_thresholds
)(struct btrfs_free_space_ctl
*ctl
);
47 bool (*use_bitmap
)(struct btrfs_free_space_ctl
*ctl
,
48 struct btrfs_free_space
*info
);
51 struct inode
*lookup_free_space_inode(struct btrfs_root
*root
,
52 struct btrfs_block_group_cache
53 *block_group
, struct btrfs_path
*path
);
54 int create_free_space_inode(struct btrfs_root
*root
,
55 struct btrfs_trans_handle
*trans
,
56 struct btrfs_block_group_cache
*block_group
,
57 struct btrfs_path
*path
);
59 int btrfs_check_trunc_cache_free_space(struct btrfs_root
*root
,
60 struct btrfs_block_rsv
*rsv
);
61 int btrfs_truncate_free_space_cache(struct btrfs_root
*root
,
62 struct btrfs_trans_handle
*trans
,
64 int load_free_space_cache(struct btrfs_fs_info
*fs_info
,
65 struct btrfs_block_group_cache
*block_group
);
66 int btrfs_write_out_cache(struct btrfs_root
*root
,
67 struct btrfs_trans_handle
*trans
,
68 struct btrfs_block_group_cache
*block_group
,
69 struct btrfs_path
*path
);
71 struct inode
*lookup_free_ino_inode(struct btrfs_root
*root
,
72 struct btrfs_path
*path
);
73 int create_free_ino_inode(struct btrfs_root
*root
,
74 struct btrfs_trans_handle
*trans
,
75 struct btrfs_path
*path
);
76 int load_free_ino_cache(struct btrfs_fs_info
*fs_info
,
77 struct btrfs_root
*root
);
78 int btrfs_write_out_ino_cache(struct btrfs_root
*root
,
79 struct btrfs_trans_handle
*trans
,
80 struct btrfs_path
*path
,
83 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache
*block_group
);
84 int __btrfs_add_free_space(struct btrfs_free_space_ctl
*ctl
,
85 u64 bytenr
, u64 size
);
87 btrfs_add_free_space(struct btrfs_block_group_cache
*block_group
,
90 return __btrfs_add_free_space(block_group
->free_space_ctl
,
93 int btrfs_remove_free_space(struct btrfs_block_group_cache
*block_group
,
94 u64 bytenr
, u64 size
);
95 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl
*ctl
);
96 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
98 u64
btrfs_find_space_for_alloc(struct btrfs_block_group_cache
*block_group
,
99 u64 offset
, u64 bytes
, u64 empty_size
,
100 u64
*max_extent_size
);
101 u64
btrfs_find_ino_for_alloc(struct btrfs_root
*fs_root
);
102 void btrfs_dump_free_space(struct btrfs_block_group_cache
*block_group
,
104 int btrfs_find_space_cluster(struct btrfs_root
*root
,
105 struct btrfs_block_group_cache
*block_group
,
106 struct btrfs_free_cluster
*cluster
,
107 u64 offset
, u64 bytes
, u64 empty_size
);
108 void btrfs_init_free_cluster(struct btrfs_free_cluster
*cluster
);
109 u64
btrfs_alloc_from_cluster(struct btrfs_block_group_cache
*block_group
,
110 struct btrfs_free_cluster
*cluster
, u64 bytes
,
111 u64 min_start
, u64
*max_extent_size
);
112 int btrfs_return_cluster_to_free_space(
113 struct btrfs_block_group_cache
*block_group
,
114 struct btrfs_free_cluster
*cluster
);
115 int btrfs_trim_block_group(struct btrfs_block_group_cache
*block_group
,
116 u64
*trimmed
, u64 start
, u64 end
, u64 minlen
);
118 /* Support functions for runnint our sanity tests */
119 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
120 int test_add_free_space_entry(struct btrfs_block_group_cache
*cache
,
121 u64 offset
, u64 bytes
, bool bitmap
);
122 int test_check_exists(struct btrfs_block_group_cache
*cache
,
123 u64 offset
, u64 bytes
);