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disk-io.h
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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 struct btrfs_fs_devices;
38 
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 reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
44  int mirror_num, struct extent_buffer **eb);
45 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
46  u64 bytenr, u32 blocksize);
47 void clean_tree_block(struct btrfs_trans_handle *trans,
48  struct btrfs_root *root, struct extent_buffer *buf);
49 int open_ctree(struct super_block *sb,
50  struct btrfs_fs_devices *fs_devices,
51  char *options);
52 int close_ctree(struct btrfs_root *root);
53 int write_ctree_super(struct btrfs_trans_handle *trans,
54  struct btrfs_root *root, int max_mirrors);
55 struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
56 int btrfs_commit_super(struct btrfs_root *root);
57 void btrfs_error_commit_super(struct btrfs_root *root);
58 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
59  u64 bytenr, u32 blocksize);
60 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
61  struct btrfs_key *location);
62 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
63  struct btrfs_key *location);
64 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
65 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
66 void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
67 void 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 atomic);
71 int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
72 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
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);
75 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
76  int metadata);
77 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
78  int rw, struct bio *bio, int mirror_num,
79  unsigned long bio_flags, u64 bio_offset,
80  extent_submit_bio_hook_t *submit_bio_start,
81  extent_submit_bio_hook_t *submit_bio_done);
82 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
83 int btrfs_write_tree_block(struct extent_buffer *buf);
84 int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
85 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
86  struct btrfs_fs_info *fs_info);
87 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
88  struct btrfs_root *root);
89 int btrfs_cleanup_transaction(struct btrfs_root *root);
90 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
91  struct btrfs_root *root);
92 void btrfs_abort_devices(struct btrfs_root *root);
93 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
94  struct btrfs_fs_info *fs_info,
95  u64 objectid);
96 int btree_lock_page_hook(struct page *page, void *data,
97  void (*flush_fn)(void *));
98 int btrfs_calc_num_tolerated_disk_barrier_failures(
99  struct btrfs_fs_info *fs_info);
100 
101 #ifdef CONFIG_DEBUG_LOCK_ALLOC
102 void btrfs_init_lockdep(void);
103 void btrfs_set_buffer_lockdep_class(u64 objectid,
104  struct extent_buffer *eb, int level);
105 #else
106 static inline void btrfs_init_lockdep(void)
107 { }
108 static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
109  struct extent_buffer *eb, int level)
110 {
111 }
112 #endif
113 #endif
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