2 * Copyright (C) 2007 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.
22 #define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
23 #define BTRFS_SUPER_INFO_SIZE 4096
25 #define BTRFS_SUPER_MIRROR_MAX 3
26 #define BTRFS_SUPER_MIRROR_SHIFT 12
28 enum btrfs_open_ctree_flags
{
29 OPEN_CTREE_WRITES
= 1,
30 OPEN_CTREE_PARTIAL
= 2,
31 OPEN_CTREE_BACKUP_ROOT
= 4,
32 OPEN_CTREE_RECOVER_SUPER
= 8,
33 OPEN_CTREE_RESTORE
= 16,
34 OPEN_CTREE_NO_BLOCK_GROUPS
= 32,
35 OPEN_CTREE_EXCLUSIVE
= 64,
38 static inline u64
btrfs_sb_offset(int mirror
)
40 u64 start
= 16 * 1024;
42 return start
<< (BTRFS_SUPER_MIRROR_SHIFT
* mirror
);
43 return BTRFS_SUPER_INFO_OFFSET
;
48 int read_whole_eb(struct btrfs_fs_info
*info
, struct extent_buffer
*eb
, int mirror
);
49 struct extent_buffer
*read_tree_block(struct btrfs_root
*root
, u64 bytenr
,
50 u32 blocksize
, u64 parent_transid
);
51 int readahead_tree_block(struct btrfs_root
*root
, u64 bytenr
, u32 blocksize
,
53 struct extent_buffer
*btrfs_find_create_tree_block(struct btrfs_root
*root
,
54 u64 bytenr
, u32 blocksize
);
56 int __setup_root(u32 nodesize
, u32 leafsize
, u32 sectorsize
,
57 u32 stripesize
, struct btrfs_root
*root
,
58 struct btrfs_fs_info
*fs_info
, u64 objectid
);
59 int clean_tree_block(struct btrfs_trans_handle
*trans
,
60 struct btrfs_root
*root
, struct extent_buffer
*buf
);
62 void btrfs_free_fs_info(struct btrfs_fs_info
*fs_info
);
63 struct btrfs_fs_info
*btrfs_new_fs_info(int writable
, u64 sb_bytenr
);
64 int btrfs_check_fs_compatibility(struct btrfs_super_block
*sb
, int writable
);
65 int btrfs_setup_all_roots(struct btrfs_fs_info
*fs_info
, u64 root_tree_bytenr
,
66 enum btrfs_open_ctree_flags flags
);
67 void btrfs_release_all_roots(struct btrfs_fs_info
*fs_info
);
68 void btrfs_cleanup_all_caches(struct btrfs_fs_info
*fs_info
);
69 int btrfs_scan_fs_devices(int fd
, const char *path
,
70 struct btrfs_fs_devices
**fs_devices
, u64 sb_bytenr
,
72 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info
*fs_info
);
74 struct btrfs_root
*open_ctree(const char *filename
, u64 sb_bytenr
,
75 enum btrfs_open_ctree_flags flags
);
76 struct btrfs_root
*open_ctree_fd(int fp
, const char *path
, u64 sb_bytenr
,
77 enum btrfs_open_ctree_flags flags
);
78 struct btrfs_fs_info
*open_ctree_fs_info(const char *filename
,
79 u64 sb_bytenr
, u64 root_tree_bytenr
,
80 enum btrfs_open_ctree_flags flags
);
81 int close_ctree(struct btrfs_root
*root
);
82 int write_all_supers(struct btrfs_root
*root
);
83 int write_ctree_super(struct btrfs_trans_handle
*trans
,
84 struct btrfs_root
*root
);
85 int btrfs_read_dev_super(int fd
, struct btrfs_super_block
*sb
, u64 sb_bytenr
);
86 int btrfs_map_bh_to_logical(struct btrfs_root
*root
, struct extent_buffer
*bh
,
88 struct extent_buffer
*btrfs_find_tree_block(struct btrfs_root
*root
,
89 u64 bytenr
, u32 blocksize
);
90 struct btrfs_root
*btrfs_read_fs_root(struct btrfs_fs_info
*fs_info
,
91 struct btrfs_key
*location
);
92 struct btrfs_root
*btrfs_read_fs_root_no_cache(struct btrfs_fs_info
*fs_info
,
93 struct btrfs_key
*location
);
94 int btrfs_free_fs_root(struct btrfs_root
*root
);
95 void btrfs_mark_buffer_dirty(struct extent_buffer
*buf
);
96 int btrfs_buffer_uptodate(struct extent_buffer
*buf
, u64 parent_transid
);
97 int btrfs_set_buffer_uptodate(struct extent_buffer
*buf
);
98 int wait_on_tree_block_writeback(struct btrfs_root
*root
,
99 struct extent_buffer
*buf
);
100 u32
btrfs_csum_data(struct btrfs_root
*root
, char *data
, u32 seed
, size_t len
);
101 void btrfs_csum_final(u32 crc
, char *result
);
103 int btrfs_commit_transaction(struct btrfs_trans_handle
*trans
,
104 struct btrfs_root
*root
);
105 int btrfs_open_device(struct btrfs_device
*dev
);
106 int csum_tree_block_size(struct extent_buffer
*buf
, u16 csum_sectorsize
,
108 int verify_tree_block_csum_silent(struct extent_buffer
*buf
, u16 csum_size
);
109 int btrfs_read_buffer(struct extent_buffer
*buf
, u64 parent_transid
);
110 int write_and_map_eb(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
111 struct extent_buffer
*eb
);
115 void raid6_gen_syndrome(int disks
, size_t bytes
, void **ptrs
);