Root/fs/btrfs/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
28static 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
36struct btrfs_device;
37struct btrfs_fs_devices;
38
39struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
40                      u32 blocksize, u64 parent_transid);
41int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
42             u64 parent_transid);
43struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
44                           u64 bytenr, u32 blocksize);
45int clean_tree_block(struct btrfs_trans_handle *trans,
46             struct btrfs_root *root, struct extent_buffer *buf);
47struct btrfs_root *open_ctree(struct super_block *sb,
48                  struct btrfs_fs_devices *fs_devices,
49                  char *options);
50int close_ctree(struct btrfs_root *root);
51int write_ctree_super(struct btrfs_trans_handle *trans,
52              struct btrfs_root *root, int max_mirrors);
53struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
54int btrfs_commit_super(struct btrfs_root *root);
55struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
56                        u64 bytenr, u32 blocksize);
57struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
58                    u64 root_objectid);
59struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
60                      struct btrfs_key *location,
61                      const char *name, int namelen);
62struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
63                           struct btrfs_key *location);
64struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
65                          struct btrfs_key *location);
66int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
67int btrfs_insert_dev_radix(struct btrfs_root *root,
68               struct block_device *bdev,
69               u64 device_id,
70               u64 block_start,
71               u64 num_blocks);
72void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
73int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
74void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
75void btrfs_mark_buffer_dirty_nonblocking(struct extent_buffer *buf);
76int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
77int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
78int wait_on_tree_block_writeback(struct btrfs_root *root,
79                 struct extent_buffer *buf);
80int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
81u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
82void btrfs_csum_final(u32 crc, char *result);
83int btrfs_open_device(struct btrfs_device *dev);
84int btrfs_verify_block_csum(struct btrfs_root *root,
85                struct extent_buffer *buf);
86int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
87            int metadata);
88int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
89            int rw, struct bio *bio, int mirror_num,
90            unsigned long bio_flags,
91            extent_submit_bio_hook_t *submit_bio_start,
92            extent_submit_bio_hook_t *submit_bio_done);
93
94int btrfs_congested_async(struct btrfs_fs_info *info, int iodone);
95unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
96int btrfs_write_tree_block(struct extent_buffer *buf);
97int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
98int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
99                 struct btrfs_fs_info *fs_info);
100int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
101                 struct btrfs_fs_info *fs_info);
102int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
103               struct btrfs_root *root);
104int btree_lock_page_hook(struct page *page);
105
106
107#ifdef CONFIG_DEBUG_LOCK_ALLOC
108void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level);
109#else
110static inline void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb,
111                         int level)
112{
113}
114#endif
115#endif
116

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