1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2007 Oracle. All rights reserved.
4 */
5
6 #ifndef BTRFS_DISK_IO_H
7 #define BTRFS_DISK_IO_H
8
9 #define BTRFS_SUPER_INFO_OFFSET SZ_64K
10 #define BTRFS_SUPER_INFO_SIZE 4096
11
12 #define BTRFS_SUPER_MIRROR_MAX 3
13 #define BTRFS_SUPER_MIRROR_SHIFT 12
14
15 /*
16 * Fixed blocksize for all devices, applies to specific ways of reading
17 * metadata like superblock. Must meet the set_blocksize requirements.
18 *
19 * Do not change.
20 */
21 #define BTRFS_BDEV_BLOCKSIZE (4096)
22
23 enum btrfs_wq_endio_type {
24 BTRFS_WQ_ENDIO_DATA,
25 BTRFS_WQ_ENDIO_METADATA,
26 BTRFS_WQ_ENDIO_FREE_SPACE,
27 BTRFS_WQ_ENDIO_RAID56,
28 };
29
btrfs_sb_offset(int mirror)30 static inline u64 btrfs_sb_offset(int mirror)
31 {
32 u64 start = SZ_16K;
33 if (mirror)
34 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
35 return BTRFS_SUPER_INFO_OFFSET;
36 }
37
38 struct btrfs_device;
39 struct btrfs_fs_devices;
40
41 void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
42 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
43 int btrfs_verify_level_key(struct extent_buffer *eb, int level,
44 struct btrfs_key *first_key, u64 parent_transid);
45 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
46 u64 parent_transid, int level,
47 struct btrfs_key *first_key);
48 void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
49 struct extent_buffer *btrfs_find_create_tree_block(
50 struct btrfs_fs_info *fs_info,
51 u64 bytenr);
52 void btrfs_clean_tree_block(struct extent_buffer *buf);
53 int __cold open_ctree(struct super_block *sb,
54 struct btrfs_fs_devices *fs_devices,
55 char *options);
56 void __cold close_ctree(struct btrfs_fs_info *fs_info);
57 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
58 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
59 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
60 int copy_num);
61 int btrfs_commit_super(struct btrfs_fs_info *fs_info);
62 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
63 struct btrfs_key *key);
64 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
65 struct btrfs_root *root);
66 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
67
68 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
69 u64 objectid, bool check_ref);
70 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
71 u64 objectid, dev_t anon_dev);
72 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
73 struct btrfs_path *path,
74 u64 objectid);
75
76 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
77 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
78 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
79 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
80 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
81 struct btrfs_root *root);
82 int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, u64 phy_offset,
83 struct page *page, u64 start, u64 end,
84 int mirror);
85 blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
86 int mirror_num, unsigned long bio_flags);
87 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
88 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
89 #endif
90
91 /*
92 * This function is used to grab the root, and avoid it is freed when we
93 * access it. But it doesn't ensure that the tree is not dropped.
94 *
95 * If you want to ensure the whole tree is safe, you should use
96 * fs_info->subvol_srcu
97 */
btrfs_grab_root(struct btrfs_root * root)98 static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
99 {
100 if (!root)
101 return NULL;
102 if (refcount_inc_not_zero(&root->refs))
103 return root;
104 return NULL;
105 }
106
107 void btrfs_put_root(struct btrfs_root *root);
108 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
109 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
110 int atomic);
111 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
112 struct btrfs_key *first_key);
113 blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
114 enum btrfs_wq_endio_type metadata);
115 blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
116 int mirror_num, unsigned long bio_flags,
117 u64 bio_offset, void *private_data,
118 extent_submit_bio_start_t *submit_bio_start);
119 blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
120 int mirror_num);
121 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
122 struct btrfs_fs_info *fs_info);
123 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
124 struct btrfs_root *root);
125 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
126 struct btrfs_fs_info *fs_info);
127 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
128 struct btrfs_fs_info *fs_info);
129 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
130 u64 objectid);
131 int btree_lock_page_hook(struct page *page, void *data,
132 void (*flush_fn)(void *));
133 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
134 int __init btrfs_end_io_wq_init(void);
135 void __cold btrfs_end_io_wq_exit(void);
136
137 #ifdef CONFIG_DEBUG_LOCK_ALLOC
138 void btrfs_init_lockdep(void);
139 void btrfs_set_buffer_lockdep_class(u64 objectid,
140 struct extent_buffer *eb, int level);
141 #else
btrfs_init_lockdep(void)142 static inline void btrfs_init_lockdep(void)
143 { }
btrfs_set_buffer_lockdep_class(u64 objectid,struct extent_buffer * eb,int level)144 static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
145 struct extent_buffer *eb, int level)
146 {
147 }
148 #endif
149
150 #endif
151
