Line data Source code
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 : enum {
29 : BTRFS_WQ_ENDIO_DATA = 0,
30 : BTRFS_WQ_ENDIO_METADATA = 1,
31 : BTRFS_WQ_ENDIO_FREE_SPACE = 2,
32 : BTRFS_WQ_ENDIO_RAID56 = 3,
33 : };
34 :
35 : static inline u64 btrfs_sb_offset(int mirror)
36 : {
37 : u64 start = 16 * 1024;
38 20230 : if (mirror)
39 11194 : return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
40 : return BTRFS_SUPER_INFO_OFFSET;
41 : }
42 :
43 : struct btrfs_device;
44 : struct btrfs_fs_devices;
45 :
46 : struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
47 : u32 blocksize, u64 parent_transid);
48 : int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
49 : u64 parent_transid);
50 : int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
51 : int mirror_num, struct extent_buffer **eb);
52 : struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
53 : u64 bytenr, u32 blocksize);
54 : void clean_tree_block(struct btrfs_trans_handle *trans,
55 : struct btrfs_root *root, struct extent_buffer *buf);
56 : int open_ctree(struct super_block *sb,
57 : struct btrfs_fs_devices *fs_devices,
58 : char *options);
59 : int close_ctree(struct btrfs_root *root);
60 : int write_ctree_super(struct btrfs_trans_handle *trans,
61 : struct btrfs_root *root, int max_mirrors);
62 : struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
63 : int btrfs_commit_super(struct btrfs_root *root);
64 : struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
65 : u64 bytenr, u32 blocksize);
66 : struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
67 : struct btrfs_key *location);
68 : int btrfs_init_fs_root(struct btrfs_root *root);
69 : int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
70 : struct btrfs_root *root);
71 : void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
72 :
73 : struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
74 : struct btrfs_key *key,
75 : bool check_ref);
76 : static inline struct btrfs_root *
77 : btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
78 : struct btrfs_key *location)
79 : {
80 1189492 : return btrfs_get_fs_root(fs_info, location, true);
81 : }
82 :
83 : int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
84 : void btrfs_btree_balance_dirty(struct btrfs_root *root);
85 : void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root);
86 : void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
87 : struct btrfs_root *root);
88 : void btrfs_free_fs_root(struct btrfs_root *root);
89 :
90 : #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
91 : struct btrfs_root *btrfs_alloc_dummy_root(void);
92 : #endif
93 :
94 : /*
95 : * This function is used to grab the root, and avoid it is freed when we
96 : * access it. But it doesn't ensure that the tree is not dropped.
97 : *
98 : * If you want to ensure the whole tree is safe, you should use
99 : * fs_info->subvol_srcu
100 : */
101 58 : static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
102 : {
103 58 : if (atomic_inc_not_zero(&root->refs))
104 58 : return root;
105 : return NULL;
106 : }
107 :
108 1185 : static inline void btrfs_put_fs_root(struct btrfs_root *root)
109 : {
110 2370 : if (atomic_dec_and_test(&root->refs))
111 1127 : kfree(root);
112 1185 : }
113 :
114 : void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
115 : int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
116 : int atomic);
117 : int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
118 : int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
119 : u32 btrfs_csum_data(char *data, u32 seed, size_t len);
120 : void btrfs_csum_final(u32 crc, char *result);
121 : int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
122 : int metadata);
123 : int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
124 : int rw, struct bio *bio, int mirror_num,
125 : unsigned long bio_flags, u64 bio_offset,
126 : extent_submit_bio_hook_t *submit_bio_start,
127 : extent_submit_bio_hook_t *submit_bio_done);
128 : unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
129 : int btrfs_write_tree_block(struct extent_buffer *buf);
130 : int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
131 : int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
132 : struct btrfs_fs_info *fs_info);
133 : int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
134 : struct btrfs_root *root);
135 : void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
136 : struct btrfs_root *root);
137 : struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
138 : struct btrfs_fs_info *fs_info,
139 : u64 objectid);
140 : int btree_lock_page_hook(struct page *page, void *data,
141 : void (*flush_fn)(void *));
142 : int btrfs_calc_num_tolerated_disk_barrier_failures(
143 : struct btrfs_fs_info *fs_info);
144 :
145 : #ifdef CONFIG_DEBUG_LOCK_ALLOC
146 : void btrfs_init_lockdep(void);
147 : void btrfs_set_buffer_lockdep_class(u64 objectid,
148 : struct extent_buffer *eb, int level);
149 : #else
150 : static inline void btrfs_init_lockdep(void)
151 : { }
152 : static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
153 : struct extent_buffer *eb, int level)
154 : {
155 : }
156 : #endif
157 : #endif
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