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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 : : 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 [ # # ][ # # ]: 0 : if (mirror)
39 : 0 : 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 : :
72 : : struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
73 : : struct btrfs_key *key,
74 : : bool check_ref);
75 : : static inline struct btrfs_root *
76 : : btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
77 : : struct btrfs_key *location)
78 : : {
79 : 0 : return btrfs_get_fs_root(fs_info, location, true);
80 : : }
81 : :
82 : : int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
83 : : void btrfs_btree_balance_dirty(struct btrfs_root *root);
84 : : void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root);
85 : : void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
86 : : struct btrfs_root *root);
87 : : void btrfs_free_fs_root(struct btrfs_root *root);
88 : :
89 : : #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
90 : : struct btrfs_root *btrfs_alloc_dummy_root(void);
91 : : #endif
92 : :
93 : : /*
94 : : * This function is used to grab the root, and avoid it is freed when we
95 : : * access it. But it doesn't ensure that the tree is not dropped.
96 : : *
97 : : * If you want to ensure the whole tree is safe, you should use
98 : : * fs_info->subvol_srcu
99 : : */
100 : : static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
101 : : {
102 [ # # ]: 0 : if (atomic_inc_not_zero(&root->refs))
103 : : return root;
104 : : return NULL;
105 : : }
106 : :
107 : : static inline void btrfs_put_fs_root(struct btrfs_root *root)
108 : : {
109 [ # # # # : 0 : if (atomic_dec_and_test(&root->refs))
# # ]
110 : 0 : kfree(root);
111 : : }
112 : :
113 : : void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
114 : : int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
115 : : int atomic);
116 : : int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
117 : : int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
118 : : u32 btrfs_csum_data(char *data, u32 seed, size_t len);
119 : : void btrfs_csum_final(u32 crc, char *result);
120 : : int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
121 : : int metadata);
122 : : int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
123 : : int rw, struct bio *bio, int mirror_num,
124 : : unsigned long bio_flags, u64 bio_offset,
125 : : extent_submit_bio_hook_t *submit_bio_start,
126 : : extent_submit_bio_hook_t *submit_bio_done);
127 : : unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
128 : : int btrfs_write_tree_block(struct extent_buffer *buf);
129 : : int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
130 : : int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
131 : : struct btrfs_fs_info *fs_info);
132 : : int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
133 : : struct btrfs_root *root);
134 : : void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
135 : : struct btrfs_root *root);
136 : : struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
137 : : struct btrfs_fs_info *fs_info,
138 : : u64 objectid);
139 : : int btree_lock_page_hook(struct page *page, void *data,
140 : : void (*flush_fn)(void *));
141 : : int btrfs_calc_num_tolerated_disk_barrier_failures(
142 : : struct btrfs_fs_info *fs_info);
143 : :
144 : : #ifdef CONFIG_DEBUG_LOCK_ALLOC
145 : : void btrfs_init_lockdep(void);
146 : : void btrfs_set_buffer_lockdep_class(u64 objectid,
147 : : struct extent_buffer *eb, int level);
148 : : #else
149 : : static inline void btrfs_init_lockdep(void)
150 : : { }
151 : : static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
152 : : struct extent_buffer *eb, int level)
153 : : {
154 : : }
155 : : #endif
156 : : #endif
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