tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
28enum {
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
35static inline u64 btrfs_sb_offset(int mirror)
36{
37 u64 start = 16 * 1024;
38 if (mirror)
39 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
40 return BTRFS_SUPER_INFO_OFFSET;
41}
42
43struct btrfs_device;
44struct btrfs_fs_devices;
45
46struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
47 u32 blocksize, u64 parent_transid);
48int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
49 u64 parent_transid);
50int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
51 int mirror_num, struct extent_buffer **eb);
52struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
53 u64 bytenr, u32 blocksize);
54void clean_tree_block(struct btrfs_trans_handle *trans,
55 struct btrfs_root *root, struct extent_buffer *buf);
56int open_ctree(struct super_block *sb,
57 struct btrfs_fs_devices *fs_devices,
58 char *options);
59int 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_commit_super(struct btrfs_root *root);
64struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
65 u64 bytenr, u32 blocksize);
66struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
67 struct btrfs_key *location);
68int btrfs_init_fs_root(struct btrfs_root *root);
69int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
70 struct btrfs_root *root);
71void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
72
73struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
74 struct btrfs_key *key,
75 bool check_ref);
76static inline struct btrfs_root *
77btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
78 struct btrfs_key *location)
79{
80 return btrfs_get_fs_root(fs_info, location, true);
81}
82
83int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
84void btrfs_btree_balance_dirty(struct btrfs_root *root);
85void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root);
86void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
87 struct btrfs_root *root);
88void btrfs_free_fs_root(struct btrfs_root *root);
89
90#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
91struct 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 */
101static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
102{
103 if (atomic_inc_not_zero(&root->refs))
104 return root;
105 return NULL;
106}
107
108static inline void btrfs_put_fs_root(struct btrfs_root *root)
109{
110 if (atomic_dec_and_test(&root->refs))
111 kfree(root);
112}
113
114void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
115int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
116 int atomic);
117int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
118int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
119u32 btrfs_csum_data(char *data, u32 seed, size_t len);
120void btrfs_csum_final(u32 crc, char *result);
121int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
122 int metadata);
123int 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);
128unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
129int btrfs_write_tree_block(struct extent_buffer *buf);
130int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
131int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
132 struct btrfs_fs_info *fs_info);
133int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
134 struct btrfs_root *root);
135void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
136 struct btrfs_root *root);
137struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
138 struct btrfs_fs_info *fs_info,
139 u64 objectid);
140int btree_lock_page_hook(struct page *page, void *data,
141 void (*flush_fn)(void *));
142int btrfs_calc_num_tolerated_disk_barrier_failures(
143 struct btrfs_fs_info *fs_info);
144
145#ifdef CONFIG_DEBUG_LOCK_ALLOC
146void btrfs_init_lockdep(void);
147void btrfs_set_buffer_lockdep_class(u64 objectid,
148 struct extent_buffer *eb, int level);
149#else
150static inline void btrfs_init_lockdep(void)
151{ }
152static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
153 struct extent_buffer *eb, int level)
154{
155}
156#endif
157#endif