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 #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 << 0),
30 OPEN_CTREE_PARTIAL = (1 << 1),
31 OPEN_CTREE_BACKUP_ROOT = (1 << 2),
32 OPEN_CTREE_RECOVER_SUPER = (1 << 3),
33 OPEN_CTREE_RESTORE = (1 << 4),
34 OPEN_CTREE_NO_BLOCK_GROUPS = (1 << 5),
35 OPEN_CTREE_EXCLUSIVE = (1 << 6),
36 OPEN_CTREE_NO_DEVICES = (1 << 7),
39 static inline u64 btrfs_sb_offset(int mirror)
41 u64 start = 16 * 1024;
43 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
44 return BTRFS_SUPER_INFO_OFFSET;
49 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror);
50 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
51 u32 blocksize, u64 parent_transid);
52 void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
54 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
55 u64 bytenr, u32 blocksize);
57 int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
58 u32 stripesize, struct btrfs_root *root,
59 struct btrfs_fs_info *fs_info, u64 objectid);
60 int clean_tree_block(struct btrfs_trans_handle *trans,
61 struct btrfs_root *root, struct extent_buffer *buf);
63 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
64 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr);
65 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable);
66 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
67 enum btrfs_open_ctree_flags flags);
68 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info);
69 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info);
70 int btrfs_scan_fs_devices(int fd, const char *path,
71 struct btrfs_fs_devices **fs_devices, u64 sb_bytenr,
72 int super_recover, int skip_devices);
73 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info);
75 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
76 enum btrfs_open_ctree_flags flags);
77 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
78 enum btrfs_open_ctree_flags flags);
79 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
80 u64 sb_bytenr, u64 root_tree_bytenr,
81 enum btrfs_open_ctree_flags flags);
82 int close_ctree(struct btrfs_root *root);
83 int write_all_supers(struct btrfs_root *root);
84 int write_ctree_super(struct btrfs_trans_handle *trans,
85 struct btrfs_root *root);
86 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
88 int btrfs_map_bh_to_logical(struct btrfs_root *root, struct extent_buffer *bh,
90 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
91 u64 bytenr, u32 blocksize);
92 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
93 struct btrfs_key *location);
94 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
95 struct btrfs_key *location);
96 int btrfs_free_fs_root(struct btrfs_root *root);
97 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
98 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
99 int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
100 int wait_on_tree_block_writeback(struct btrfs_root *root,
101 struct extent_buffer *buf);
102 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
103 void btrfs_csum_final(u32 crc, char *result);
105 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
106 struct btrfs_root *root);
107 int btrfs_open_device(struct btrfs_device *dev);
108 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,
110 int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size);
111 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
112 int write_and_map_eb(struct btrfs_trans_handle *trans, struct btrfs_root *root,
113 struct extent_buffer *eb);
116 void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs);