Btrfs-progs: enhance btrfs-image to restore image onto multiple disks
[platform/upstream/btrfs-progs.git] / disk-io.h
1 /*
2  * Copyright (C) 2007 Oracle.  All rights reserved.
3  *
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.
7  *
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.
12  *
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.
17  */
18
19 #ifndef __DISKIO__
20 #define __DISKIO__
21
22 #define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
23 #define BTRFS_SUPER_INFO_SIZE 4096
24
25 #define BTRFS_SUPER_MIRROR_MAX   3
26 #define BTRFS_SUPER_MIRROR_SHIFT 12
27
28 static inline u64 btrfs_sb_offset(int mirror)
29 {
30         u64 start = 16 * 1024;
31         if (mirror)
32                 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
33         return BTRFS_SUPER_INFO_OFFSET;
34 }
35
36 struct btrfs_device;
37
38 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror);
39 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
40                                       u32 blocksize, u64 parent_transid);
41 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
42                          u64 parent_transid);
43 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
44                      struct extent_buffer *eb);
45 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
46                                                    u64 bytenr, u32 blocksize);
47
48 int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
49                         u32 stripesize, struct btrfs_root *root,
50                         struct btrfs_fs_info *fs_info, u64 objectid);
51 int clean_tree_block(struct btrfs_trans_handle *trans,
52                      struct btrfs_root *root, struct extent_buffer *buf);
53 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes);
54 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
55                                  int writes);
56 struct btrfs_fs_info *open_ctree_fs_info_restore(const char *filename,
57                                          u64 sb_bytenr, u64 root_tree_bytenr,
58                                          int writes, int partial);
59 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
60                                          u64 sb_bytenr, u64 root_tree_bytenr,
61                                          int writes, int partial);
62 int close_ctree(struct btrfs_root *root);
63 int write_all_supers(struct btrfs_root *root);
64 int write_ctree_super(struct btrfs_trans_handle *trans,
65                       struct btrfs_root *root);
66 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr);
67 int btrfs_map_bh_to_logical(struct btrfs_root *root, struct extent_buffer *bh,
68                             u64 logical);
69 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
70                                             u64 bytenr, u32 blocksize);
71 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
72                                       struct btrfs_key *location);
73 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
74                                                struct btrfs_key *location);
75 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
76 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
77 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
78 int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
79 int wait_on_tree_block_writeback(struct btrfs_root *root,
80                                  struct extent_buffer *buf);
81 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
82 void btrfs_csum_final(u32 crc, char *result);
83
84 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
85                              struct btrfs_root *root);
86 int btrfs_open_device(struct btrfs_device *dev);
87 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,
88                          int verify);
89 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
90                     int verify);
91 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
92 #endif
93
94 /* raid6.c */
95 void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs);