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 SZ_64K
23 #define BTRFS_SUPER_INFO_SIZE 4096
25 #define BTRFS_SUPER_MIRROR_MAX 3
26 #define BTRFS_SUPER_MIRROR_SHIFT 12
29 * Fixed blocksize for all devices, applies to specific ways of reading
30 * metadata like superblock. Must meet the set_blocksize requirements.
34 #define BTRFS_BDEV_BLOCKSIZE (4096)
36 enum btrfs_wq_endio_type
{
37 BTRFS_WQ_ENDIO_DATA
= 0,
38 BTRFS_WQ_ENDIO_METADATA
= 1,
39 BTRFS_WQ_ENDIO_FREE_SPACE
= 2,
40 BTRFS_WQ_ENDIO_RAID56
= 3,
41 BTRFS_WQ_ENDIO_DIO_REPAIR
= 4,
44 static inline u64
btrfs_sb_offset(int mirror
)
48 return start
<< (BTRFS_SUPER_MIRROR_SHIFT
* mirror
);
49 return BTRFS_SUPER_INFO_OFFSET
;
53 struct btrfs_fs_devices
;
55 struct extent_buffer
*read_tree_block(struct btrfs_fs_info
*fs_info
,
56 u64 bytenr
, u64 parent_transid
);
57 void readahead_tree_block(struct btrfs_fs_info
*fs_info
, u64 bytenr
);
58 int reada_tree_block_flagged(struct btrfs_fs_info
*fs_info
, u64 bytenr
,
59 int mirror_num
, struct extent_buffer
**eb
);
60 struct extent_buffer
*btrfs_find_create_tree_block(
61 struct btrfs_fs_info
*fs_info
,
63 void clean_tree_block(struct btrfs_fs_info
*fs_info
, struct extent_buffer
*buf
);
64 int open_ctree(struct super_block
*sb
,
65 struct btrfs_fs_devices
*fs_devices
,
67 void close_ctree(struct btrfs_fs_info
*fs_info
);
68 int write_all_supers(struct btrfs_fs_info
*fs_info
, int max_mirrors
);
69 struct buffer_head
*btrfs_read_dev_super(struct block_device
*bdev
);
70 int btrfs_read_dev_one_super(struct block_device
*bdev
, int copy_num
,
71 struct buffer_head
**bh_ret
);
72 int btrfs_commit_super(struct btrfs_fs_info
*fs_info
);
73 struct btrfs_root
*btrfs_read_fs_root(struct btrfs_root
*tree_root
,
74 struct btrfs_key
*location
);
75 int btrfs_init_fs_root(struct btrfs_root
*root
);
76 struct btrfs_root
*btrfs_lookup_fs_root(struct btrfs_fs_info
*fs_info
,
78 int btrfs_insert_fs_root(struct btrfs_fs_info
*fs_info
,
79 struct btrfs_root
*root
);
80 void btrfs_free_fs_roots(struct btrfs_fs_info
*fs_info
);
82 struct btrfs_root
*btrfs_get_fs_root(struct btrfs_fs_info
*fs_info
,
83 struct btrfs_key
*key
,
85 static inline struct btrfs_root
*
86 btrfs_read_fs_root_no_name(struct btrfs_fs_info
*fs_info
,
87 struct btrfs_key
*location
)
89 return btrfs_get_fs_root(fs_info
, location
, true);
92 int btrfs_cleanup_fs_roots(struct btrfs_fs_info
*fs_info
);
93 void btrfs_btree_balance_dirty(struct btrfs_fs_info
*fs_info
);
94 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info
*fs_info
);
95 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info
*fs_info
,
96 struct btrfs_root
*root
);
97 void btrfs_free_fs_root(struct btrfs_root
*root
);
99 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
100 struct btrfs_root
*btrfs_alloc_dummy_root(struct btrfs_fs_info
*fs_info
);
104 * This function is used to grab the root, and avoid it is freed when we
105 * access it. But it doesn't ensure that the tree is not dropped.
107 * If you want to ensure the whole tree is safe, you should use
108 * fs_info->subvol_srcu
110 static inline struct btrfs_root
*btrfs_grab_fs_root(struct btrfs_root
*root
)
112 if (refcount_inc_not_zero(&root
->refs
))
117 static inline void btrfs_put_fs_root(struct btrfs_root
*root
)
119 if (refcount_dec_and_test(&root
->refs
))
123 void btrfs_mark_buffer_dirty(struct extent_buffer
*buf
);
124 int btrfs_buffer_uptodate(struct extent_buffer
*buf
, u64 parent_transid
,
126 int btrfs_read_buffer(struct extent_buffer
*buf
, u64 parent_transid
);
127 u32
btrfs_csum_data(const char *data
, u32 seed
, size_t len
);
128 void btrfs_csum_final(u32 crc
, u8
*result
);
129 blk_status_t
btrfs_bio_wq_end_io(struct btrfs_fs_info
*info
, struct bio
*bio
,
130 enum btrfs_wq_endio_type metadata
);
131 blk_status_t
btrfs_wq_submit_bio(struct btrfs_fs_info
*fs_info
, struct bio
*bio
,
132 int mirror_num
, unsigned long bio_flags
,
133 u64 bio_offset
, void *private_data
,
134 extent_submit_bio_hook_t
*submit_bio_start
,
135 extent_submit_bio_hook_t
*submit_bio_done
);
136 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info
*info
);
137 int btrfs_write_tree_block(struct extent_buffer
*buf
);
138 void btrfs_wait_tree_block_writeback(struct extent_buffer
*buf
);
139 int btrfs_init_log_root_tree(struct btrfs_trans_handle
*trans
,
140 struct btrfs_fs_info
*fs_info
);
141 int btrfs_add_log_tree(struct btrfs_trans_handle
*trans
,
142 struct btrfs_root
*root
);
143 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction
*trans
,
144 struct btrfs_fs_info
*fs_info
);
145 void btrfs_cleanup_one_transaction(struct btrfs_transaction
*trans
,
146 struct btrfs_fs_info
*fs_info
);
147 struct btrfs_root
*btrfs_create_tree(struct btrfs_trans_handle
*trans
,
148 struct btrfs_fs_info
*fs_info
,
150 int btree_lock_page_hook(struct page
*page
, void *data
,
151 void (*flush_fn
)(void *));
152 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags
);
153 int __init
btrfs_end_io_wq_init(void);
154 void btrfs_end_io_wq_exit(void);
156 #ifdef CONFIG_DEBUG_LOCK_ALLOC
157 void btrfs_init_lockdep(void);
158 void btrfs_set_buffer_lockdep_class(u64 objectid
,
159 struct extent_buffer
*eb
, int level
);
161 static inline void btrfs_init_lockdep(void)
163 static inline void btrfs_set_buffer_lockdep_class(u64 objectid
,
164 struct extent_buffer
*eb
, int level
)