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.
19 #ifndef __BTRFS_DISK_IO_H__
20 #define __BTRFS_DISK_IO_H__
22 #include "kerncompat.h"
25 #define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
26 #define BTRFS_SUPER_INFO_SIZE 4096
28 #define BTRFS_SUPER_MIRROR_MAX 3
29 #define BTRFS_SUPER_MIRROR_SHIFT 12
31 enum btrfs_open_ctree_flags
{
32 OPEN_CTREE_WRITES
= (1 << 0),
33 OPEN_CTREE_PARTIAL
= (1 << 1),
34 OPEN_CTREE_BACKUP_ROOT
= (1 << 2),
35 OPEN_CTREE_RECOVER_SUPER
= (1 << 3),
36 OPEN_CTREE_RESTORE
= (1 << 4),
37 OPEN_CTREE_NO_BLOCK_GROUPS
= (1 << 5),
38 OPEN_CTREE_EXCLUSIVE
= (1 << 6),
39 OPEN_CTREE_NO_DEVICES
= (1 << 7),
41 * Don't print error messages if bytenr or checksums do not match in
42 * tree block headers. Turn on by OPEN_CTREE_SUPPRESS_ERROR
44 OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS
= (1 << 8),
45 /* Return chunk root */
46 __OPEN_CTREE_RETURN_CHUNK_ROOT
= (1 << 9),
47 OPEN_CTREE_CHUNK_ROOT_ONLY
= OPEN_CTREE_PARTIAL
+
48 OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS
+
49 __OPEN_CTREE_RETURN_CHUNK_ROOT
,
51 * TODO: cleanup: Split the open_ctree_flags into more indepent
53 * Like split PARTIAL into SKIP_CSUM/SKIP_EXTENT
56 OPEN_CTREE_IGNORE_FSID_MISMATCH
= (1 << 10),
59 * Allow open_ctree_fs_info() to return a incomplete fs_info with
60 * system chunks from super block only.
61 * It's useful for chunk corruption case.
62 * Makes no sense for open_ctree variants returning btrfs_root.
64 OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR
= (1 << 11)
67 static inline u64
btrfs_sb_offset(int mirror
)
69 u64 start
= 16 * 1024;
71 return start
<< (BTRFS_SUPER_MIRROR_SHIFT
* mirror
);
72 return BTRFS_SUPER_INFO_OFFSET
;
77 int read_whole_eb(struct btrfs_fs_info
*info
, struct extent_buffer
*eb
, int mirror
);
78 struct extent_buffer
* read_tree_block_fs_info(
79 struct btrfs_fs_info
*fs_info
, u64 bytenr
, u32 blocksize
,
81 static inline struct extent_buffer
* read_tree_block(
82 struct btrfs_root
*root
, u64 bytenr
, u32 blocksize
,
85 return read_tree_block_fs_info(root
->fs_info
, bytenr
, blocksize
,
89 int read_extent_data(struct btrfs_root
*root
, char *data
, u64 logical
,
90 u64
*len
, int mirror
);
91 void readahead_tree_block(struct btrfs_root
*root
, u64 bytenr
, u32 blocksize
,
93 struct extent_buffer
* btrfs_find_create_tree_block(
94 struct btrfs_fs_info
*fs_info
, u64 bytenr
, u32 blocksize
);
96 int __setup_root(u32 nodesize
, u32 leafsize
, u32 sectorsize
,
97 u32 stripesize
, struct btrfs_root
*root
,
98 struct btrfs_fs_info
*fs_info
, u64 objectid
);
99 int clean_tree_block(struct btrfs_trans_handle
*trans
,
100 struct btrfs_root
*root
, struct extent_buffer
*buf
);
102 void btrfs_free_fs_info(struct btrfs_fs_info
*fs_info
);
103 struct btrfs_fs_info
*btrfs_new_fs_info(int writable
, u64 sb_bytenr
);
104 int btrfs_check_fs_compatibility(struct btrfs_super_block
*sb
, int writable
);
105 int btrfs_setup_all_roots(struct btrfs_fs_info
*fs_info
, u64 root_tree_bytenr
,
106 enum btrfs_open_ctree_flags flags
);
107 void btrfs_release_all_roots(struct btrfs_fs_info
*fs_info
);
108 void btrfs_cleanup_all_caches(struct btrfs_fs_info
*fs_info
);
109 int btrfs_scan_fs_devices(int fd
, const char *path
,
110 struct btrfs_fs_devices
**fs_devices
, u64 sb_bytenr
,
111 int super_recover
, int skip_devices
);
112 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info
*fs_info
,
113 u64 chunk_root_bytenr
);
115 struct btrfs_root
*open_ctree(const char *filename
, u64 sb_bytenr
,
116 enum btrfs_open_ctree_flags flags
);
117 struct btrfs_root
*open_ctree_fd(int fp
, const char *path
, u64 sb_bytenr
,
118 enum btrfs_open_ctree_flags flags
);
119 struct btrfs_fs_info
*open_ctree_fs_info(const char *filename
,
120 u64 sb_bytenr
, u64 root_tree_bytenr
,
121 u64 chunk_root_bytenr
,
122 enum btrfs_open_ctree_flags flags
);
123 int close_ctree_fs_info(struct btrfs_fs_info
*fs_info
);
124 static inline int close_ctree(struct btrfs_root
*root
)
127 return close_ctree_fs_info(root
->fs_info
);
130 int write_all_supers(struct btrfs_root
*root
);
131 int write_ctree_super(struct btrfs_trans_handle
*trans
,
132 struct btrfs_root
*root
);
133 int btrfs_read_dev_super(int fd
, struct btrfs_super_block
*sb
, u64 sb_bytenr
,
135 int btrfs_map_bh_to_logical(struct btrfs_root
*root
, struct extent_buffer
*bh
,
137 struct extent_buffer
*btrfs_find_tree_block(struct btrfs_root
*root
,
138 u64 bytenr
, u32 blocksize
);
139 struct btrfs_root
*btrfs_read_fs_root(struct btrfs_fs_info
*fs_info
,
140 struct btrfs_key
*location
);
141 struct btrfs_root
*btrfs_read_fs_root_no_cache(struct btrfs_fs_info
*fs_info
,
142 struct btrfs_key
*location
);
143 int btrfs_free_fs_root(struct btrfs_root
*root
);
144 void btrfs_mark_buffer_dirty(struct extent_buffer
*buf
);
145 int btrfs_buffer_uptodate(struct extent_buffer
*buf
, u64 parent_transid
);
146 int btrfs_set_buffer_uptodate(struct extent_buffer
*buf
);
147 int wait_on_tree_block_writeback(struct btrfs_root
*root
,
148 struct extent_buffer
*buf
);
149 u32
btrfs_csum_data(struct btrfs_root
*root
, char *data
, u32 seed
, size_t len
);
150 void btrfs_csum_final(u32 crc
, char *result
);
152 int btrfs_commit_transaction(struct btrfs_trans_handle
*trans
,
153 struct btrfs_root
*root
);
154 int btrfs_open_device(struct btrfs_device
*dev
);
155 int csum_tree_block_size(struct extent_buffer
*buf
, u16 csum_sectorsize
,
157 int verify_tree_block_csum_silent(struct extent_buffer
*buf
, u16 csum_size
);
158 int btrfs_read_buffer(struct extent_buffer
*buf
, u64 parent_transid
);
159 int write_tree_block(struct btrfs_trans_handle
*trans
,
160 struct btrfs_root
*root
,
161 struct extent_buffer
*eb
);
162 int write_and_map_eb(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
163 struct extent_buffer
*eb
);
166 void raid6_gen_syndrome(int disks
, size_t bytes
, void **ptrs
);