1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #ifndef BTRFS_DISK_IO_H
7 #define BTRFS_DISK_IO_H
9 #define BTRFS_SUPER_MIRROR_MAX 3
10 #define BTRFS_SUPER_MIRROR_SHIFT 12
13 * Fixed blocksize for all devices, applies to specific ways of reading
14 * metadata like superblock. Must meet the set_blocksize requirements.
18 #define BTRFS_BDEV_BLOCKSIZE (4096)
20 static inline u64
btrfs_sb_offset(int mirror
)
24 return start
<< (BTRFS_SUPER_MIRROR_SHIFT
* mirror
);
25 return BTRFS_SUPER_INFO_OFFSET
;
29 struct btrfs_fs_devices
;
31 void btrfs_check_leaked_roots(struct btrfs_fs_info
*fs_info
);
32 void btrfs_init_fs_info(struct btrfs_fs_info
*fs_info
);
33 int btrfs_verify_level_key(struct extent_buffer
*eb
, int level
,
34 struct btrfs_key
*first_key
, u64 parent_transid
);
35 struct extent_buffer
*read_tree_block(struct btrfs_fs_info
*fs_info
, u64 bytenr
,
36 u64 owner_root
, u64 parent_transid
,
37 int level
, struct btrfs_key
*first_key
);
38 struct extent_buffer
*btrfs_find_create_tree_block(
39 struct btrfs_fs_info
*fs_info
,
40 u64 bytenr
, u64 owner_root
,
42 void btrfs_clean_tree_block(struct extent_buffer
*buf
);
43 void btrfs_clear_oneshot_options(struct btrfs_fs_info
*fs_info
);
44 int btrfs_start_pre_rw_mount(struct btrfs_fs_info
*fs_info
);
45 int __cold
open_ctree(struct super_block
*sb
,
46 struct btrfs_fs_devices
*fs_devices
,
48 void __cold
close_ctree(struct btrfs_fs_info
*fs_info
);
49 int write_all_supers(struct btrfs_fs_info
*fs_info
, int max_mirrors
);
50 struct btrfs_super_block
*btrfs_read_dev_super(struct block_device
*bdev
);
51 struct btrfs_super_block
*btrfs_read_dev_one_super(struct block_device
*bdev
,
53 int btrfs_commit_super(struct btrfs_fs_info
*fs_info
);
54 struct btrfs_root
*btrfs_read_tree_root(struct btrfs_root
*tree_root
,
55 struct btrfs_key
*key
);
56 int btrfs_insert_fs_root(struct btrfs_fs_info
*fs_info
,
57 struct btrfs_root
*root
);
58 void btrfs_free_fs_roots(struct btrfs_fs_info
*fs_info
);
60 struct btrfs_root
*btrfs_get_fs_root(struct btrfs_fs_info
*fs_info
,
61 u64 objectid
, bool check_ref
);
62 struct btrfs_root
*btrfs_get_new_fs_root(struct btrfs_fs_info
*fs_info
,
63 u64 objectid
, dev_t anon_dev
);
64 struct btrfs_root
*btrfs_get_fs_root_commit_root(struct btrfs_fs_info
*fs_info
,
65 struct btrfs_path
*path
,
67 int btrfs_global_root_insert(struct btrfs_root
*root
);
68 void btrfs_global_root_delete(struct btrfs_root
*root
);
69 struct btrfs_root
*btrfs_global_root(struct btrfs_fs_info
*fs_info
,
70 struct btrfs_key
*key
);
71 struct btrfs_root
*btrfs_csum_root(struct btrfs_fs_info
*fs_info
, u64 bytenr
);
72 struct btrfs_root
*btrfs_extent_root(struct btrfs_fs_info
*fs_info
, u64 bytenr
);
74 void btrfs_free_fs_info(struct btrfs_fs_info
*fs_info
);
75 int btrfs_cleanup_fs_roots(struct btrfs_fs_info
*fs_info
);
76 void btrfs_btree_balance_dirty(struct btrfs_fs_info
*fs_info
);
77 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info
*fs_info
);
78 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info
*fs_info
,
79 struct btrfs_root
*root
);
80 int btrfs_validate_metadata_buffer(struct btrfs_bio
*bbio
,
81 struct page
*page
, u64 start
, u64 end
,
83 void btrfs_submit_metadata_bio(struct inode
*inode
, struct bio
*bio
, int mirror_num
);
84 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
85 struct btrfs_root
*btrfs_alloc_dummy_root(struct btrfs_fs_info
*fs_info
);
89 * This function is used to grab the root, and avoid it is freed when we
90 * access it. But it doesn't ensure that the tree is not dropped.
92 * If you want to ensure the whole tree is safe, you should use
93 * fs_info->subvol_srcu
95 static inline struct btrfs_root
*btrfs_grab_root(struct btrfs_root
*root
)
99 if (refcount_inc_not_zero(&root
->refs
))
104 static inline struct btrfs_root
*btrfs_block_group_root(struct btrfs_fs_info
*fs_info
)
106 if (btrfs_fs_incompat(fs_info
, EXTENT_TREE_V2
))
107 return fs_info
->block_group_root
;
108 return btrfs_extent_root(fs_info
, 0);
111 void btrfs_put_root(struct btrfs_root
*root
);
112 void btrfs_mark_buffer_dirty(struct extent_buffer
*buf
);
113 int btrfs_buffer_uptodate(struct extent_buffer
*buf
, u64 parent_transid
,
115 int btrfs_read_extent_buffer(struct extent_buffer
*buf
, u64 parent_transid
,
116 int level
, struct btrfs_key
*first_key
);
117 bool btrfs_wq_submit_bio(struct inode
*inode
, struct bio
*bio
, int mirror_num
,
119 extent_submit_bio_start_t
*submit_bio_start
);
120 blk_status_t
btrfs_submit_bio_done(void *private_data
, struct bio
*bio
,
122 int btrfs_alloc_log_tree_node(struct btrfs_trans_handle
*trans
,
123 struct btrfs_root
*root
);
124 int btrfs_init_log_root_tree(struct btrfs_trans_handle
*trans
,
125 struct btrfs_fs_info
*fs_info
);
126 int btrfs_add_log_tree(struct btrfs_trans_handle
*trans
,
127 struct btrfs_root
*root
);
128 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction
*trans
,
129 struct btrfs_fs_info
*fs_info
);
130 void btrfs_cleanup_one_transaction(struct btrfs_transaction
*trans
,
131 struct btrfs_fs_info
*fs_info
);
132 struct btrfs_root
*btrfs_create_tree(struct btrfs_trans_handle
*trans
,
134 int btree_lock_page_hook(struct page
*page
, void *data
,
135 void (*flush_fn
)(void *));
136 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags
);
137 int btrfs_get_free_objectid(struct btrfs_root
*root
, u64
*objectid
);
138 int btrfs_init_root_free_objectid(struct btrfs_root
*root
);
140 #ifdef CONFIG_DEBUG_LOCK_ALLOC
141 void btrfs_set_buffer_lockdep_class(u64 objectid
,
142 struct extent_buffer
*eb
, int level
);
144 static inline void btrfs_set_buffer_lockdep_class(u64 objectid
,
145 struct extent_buffer
*eb
, int level
)