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 static inline u64 btrfs_sb_offset(int mirror)
30 u64 start = 16 * 1024;
32 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
33 return BTRFS_SUPER_INFO_OFFSET;
38 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
39 u32 blocksize, u64 parent_transid);
40 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
42 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
43 u64 bytenr, u32 blocksize);
44 int clean_tree_block(struct btrfs_trans_handle *trans,
45 struct btrfs_root *root, struct extent_buffer *buf);
46 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes);
47 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
49 struct btrfs_root *open_ctree_recovery(const char *filename, u64 sb_bytenr,
50 u64 root_tree_bytenr);
51 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
52 u64 sb_bytenr, int writes,
54 int close_ctree(struct btrfs_root *root);
55 int write_all_supers(struct btrfs_root *root);
56 int write_ctree_super(struct btrfs_trans_handle *trans,
57 struct btrfs_root *root);
58 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr);
59 int btrfs_map_bh_to_logical(struct btrfs_root *root, struct extent_buffer *bh,
61 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
62 u64 bytenr, u32 blocksize);
63 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
64 struct btrfs_key *location);
65 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
66 struct btrfs_key *location);
67 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
68 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
69 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
70 int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
71 int wait_on_tree_block_writeback(struct btrfs_root *root,
72 struct extent_buffer *buf);
73 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
74 void btrfs_csum_final(u32 crc, char *result);
76 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
77 struct btrfs_root *root);
78 int btrfs_open_device(struct btrfs_device *dev);
79 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,
81 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
83 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);