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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
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);
55int btrfs_error_commit_super(struct btrfs_root *root);
56struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
57 u64 bytenr, u32 blocksize);
58struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
59 struct btrfs_key *location);
60struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
61 struct btrfs_key *location);
62int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
63void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
64void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
65int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
66void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
67int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
68int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
69int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
70u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
71void btrfs_csum_final(u32 crc, char *result);
72int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
73 int metadata);
74int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
75 int rw, struct bio *bio, int mirror_num,
76 unsigned long bio_flags, u64 bio_offset,
77 extent_submit_bio_hook_t *submit_bio_start,
78 extent_submit_bio_hook_t *submit_bio_done);
79unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
80int btrfs_write_tree_block(struct extent_buffer *buf);
81int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
82int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
83 struct btrfs_fs_info *fs_info);
84int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
85 struct btrfs_root *root);
86int btree_lock_page_hook(struct page *page);
87
88
89#ifdef CONFIG_DEBUG_LOCK_ALLOC
90void btrfs_init_lockdep(void);
91void btrfs_set_buffer_lockdep_class(u64 objectid,
92 struct extent_buffer *eb, int level);
93#else
94static inline void btrfs_init_lockdep(void)
95{ }
96static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
97 struct extent_buffer *eb, int level)
98{
99}
100#endif
101#endif
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 SZ_64K
23#define BTRFS_SUPER_INFO_SIZE 4096
24
25#define BTRFS_SUPER_MIRROR_MAX 3
26#define BTRFS_SUPER_MIRROR_SHIFT 12
27
28enum btrfs_wq_endio_type {
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 BTRFS_WQ_ENDIO_DIO_REPAIR = 4,
34};
35
36static inline u64 btrfs_sb_offset(int mirror)
37{
38 u64 start = SZ_16K;
39 if (mirror)
40 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
41 return BTRFS_SUPER_INFO_OFFSET;
42}
43
44struct btrfs_device;
45struct btrfs_fs_devices;
46
47struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
48 u64 parent_transid);
49void readahead_tree_block(struct btrfs_root *root, u64 bytenr);
50int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr,
51 int mirror_num, struct extent_buffer **eb);
52struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
53 u64 bytenr);
54void clean_tree_block(struct btrfs_trans_handle *trans,
55 struct btrfs_fs_info *fs_info, struct extent_buffer *buf);
56int open_ctree(struct super_block *sb,
57 struct btrfs_fs_devices *fs_devices,
58 char *options);
59void close_ctree(struct btrfs_root *root);
60int write_ctree_super(struct btrfs_trans_handle *trans,
61 struct btrfs_root *root, int max_mirrors);
62struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
63int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
64 struct buffer_head **bh_ret);
65int btrfs_commit_super(struct btrfs_root *root);
66struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
67 u64 bytenr);
68struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
69 struct btrfs_key *location);
70int btrfs_init_fs_root(struct btrfs_root *root);
71int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
72 struct btrfs_root *root);
73void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
74
75struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
76 struct btrfs_key *key,
77 bool check_ref);
78static inline struct btrfs_root *
79btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
80 struct btrfs_key *location)
81{
82 return btrfs_get_fs_root(fs_info, location, true);
83}
84
85int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
86void btrfs_btree_balance_dirty(struct btrfs_root *root);
87void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root);
88void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
89 struct btrfs_root *root);
90void btrfs_free_fs_root(struct btrfs_root *root);
91
92#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
93struct btrfs_root *btrfs_alloc_dummy_root(void);
94#endif
95
96/*
97 * This function is used to grab the root, and avoid it is freed when we
98 * access it. But it doesn't ensure that the tree is not dropped.
99 *
100 * If you want to ensure the whole tree is safe, you should use
101 * fs_info->subvol_srcu
102 */
103static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
104{
105 if (atomic_inc_not_zero(&root->refs))
106 return root;
107 return NULL;
108}
109
110static inline void btrfs_put_fs_root(struct btrfs_root *root)
111{
112 if (atomic_dec_and_test(&root->refs))
113 kfree(root);
114}
115
116void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
117int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
118 int atomic);
119int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
120u32 btrfs_csum_data(char *data, u32 seed, size_t len);
121void btrfs_csum_final(u32 crc, char *result);
122int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
123 enum btrfs_wq_endio_type metadata);
124int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
125 int rw, struct bio *bio, int mirror_num,
126 unsigned long bio_flags, u64 bio_offset,
127 extent_submit_bio_hook_t *submit_bio_start,
128 extent_submit_bio_hook_t *submit_bio_done);
129unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
130int btrfs_write_tree_block(struct extent_buffer *buf);
131int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
132int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
133 struct btrfs_fs_info *fs_info);
134int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
135 struct btrfs_root *root);
136void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
137 struct btrfs_root *root);
138struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
139 struct btrfs_fs_info *fs_info,
140 u64 objectid);
141int btree_lock_page_hook(struct page *page, void *data,
142 void (*flush_fn)(void *));
143int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
144int btrfs_calc_num_tolerated_disk_barrier_failures(
145 struct btrfs_fs_info *fs_info);
146int __init btrfs_end_io_wq_init(void);
147void btrfs_end_io_wq_exit(void);
148
149#ifdef CONFIG_DEBUG_LOCK_ALLOC
150void btrfs_init_lockdep(void);
151void btrfs_set_buffer_lockdep_class(u64 objectid,
152 struct extent_buffer *eb, int level);
153#else
154static inline void btrfs_init_lockdep(void)
155{ }
156static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
157 struct extent_buffer *eb, int level)
158{
159}
160#endif
161#endif