2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
22 #define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
23 #define BTRFS_SUPER_INFO_SIZE 4096
25 #define BTRFS_SUPER_MIRROR_MAX 3
26 #define BTRFS_SUPER_MIRROR_SHIFT 12
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,
36 static inline u64 btrfs_sb_offset(int mirror)
38 u64 start = 16 * 1024;
40 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
41 return BTRFS_SUPER_INFO_OFFSET;
45 struct btrfs_fs_devices;
47 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
48 u32 blocksize, u64 parent_transid);
49 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
51 int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
52 int mirror_num, struct extent_buffer **eb);
53 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
54 u64 bytenr, u32 blocksize);
55 void clean_tree_block(struct btrfs_trans_handle *trans,
56 struct btrfs_root *root, struct extent_buffer *buf);
57 int open_ctree(struct super_block *sb,
58 struct btrfs_fs_devices *fs_devices,
60 void close_ctree(struct btrfs_root *root);
61 int write_ctree_super(struct btrfs_trans_handle *trans,
62 struct btrfs_root *root, int max_mirrors);
63 struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
64 int btrfs_commit_super(struct btrfs_root *root);
65 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
66 u64 bytenr, u32 blocksize);
67 struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
68 struct btrfs_key *location);
69 int btrfs_init_fs_root(struct btrfs_root *root);
70 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
71 struct btrfs_root *root);
72 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
74 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
75 struct btrfs_key *key,
77 static inline struct btrfs_root *
78 btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
79 struct btrfs_key *location)
81 return btrfs_get_fs_root(fs_info, location, true);
84 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
85 void btrfs_btree_balance_dirty(struct btrfs_root *root);
86 void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root);
87 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
88 struct btrfs_root *root);
89 void btrfs_free_fs_root(struct btrfs_root *root);
91 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
92 struct btrfs_root *btrfs_alloc_dummy_root(void);
96 * This function is used to grab the root, and avoid it is freed when we
97 * access it. But it doesn't ensure that the tree is not dropped.
99 * If you want to ensure the whole tree is safe, you should use
100 * fs_info->subvol_srcu
102 static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
104 if (atomic_inc_not_zero(&root->refs))
109 static inline void btrfs_put_fs_root(struct btrfs_root *root)
111 if (atomic_dec_and_test(&root->refs))
115 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
116 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
118 int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
119 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
120 u32 btrfs_csum_data(char *data, u32 seed, size_t len);
121 void btrfs_csum_final(u32 crc, char *result);
122 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
124 int 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);
129 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
130 int btrfs_write_tree_block(struct extent_buffer *buf);
131 int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
132 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
133 struct btrfs_fs_info *fs_info);
134 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
135 struct btrfs_root *root);
136 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
137 struct btrfs_root *root);
138 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
139 struct btrfs_fs_info *fs_info,
141 int btree_lock_page_hook(struct page *page, void *data,
142 void (*flush_fn)(void *));
143 int btrfs_calc_num_tolerated_disk_barrier_failures(
144 struct btrfs_fs_info *fs_info);
146 #ifdef CONFIG_DEBUG_LOCK_ALLOC
147 void btrfs_init_lockdep(void);
148 void btrfs_set_buffer_lockdep_class(u64 objectid,
149 struct extent_buffer *eb, int level);
151 static inline void btrfs_init_lockdep(void)
153 static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
154 struct extent_buffer *eb, int level)