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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
23enum 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 BTRFS_WQ_ENDIO_DIO_REPAIR,
29};
30
31static inline u64 btrfs_sb_offset(int mirror)
32{
33 u64 start = SZ_16K;
34 if (mirror)
35 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
36 return BTRFS_SUPER_INFO_OFFSET;
37}
38
39struct btrfs_device;
40struct btrfs_fs_devices;
41
42int btrfs_verify_level_key(struct extent_buffer *eb, int level,
43 struct btrfs_key *first_key, u64 parent_transid);
44struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
45 u64 parent_transid, int level,
46 struct btrfs_key *first_key);
47void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
48struct extent_buffer *btrfs_find_create_tree_block(
49 struct btrfs_fs_info *fs_info,
50 u64 bytenr);
51void btrfs_clean_tree_block(struct extent_buffer *buf);
52int open_ctree(struct super_block *sb,
53 struct btrfs_fs_devices *fs_devices,
54 char *options);
55void close_ctree(struct btrfs_fs_info *fs_info);
56int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
57struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
58int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
59 struct buffer_head **bh_ret);
60int btrfs_commit_super(struct btrfs_fs_info *fs_info);
61struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
62 struct btrfs_key *location);
63int btrfs_init_fs_root(struct btrfs_root *root);
64struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
65 u64 root_id);
66int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
67 struct btrfs_root *root);
68void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
69
70struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
71 struct btrfs_key *key,
72 bool check_ref);
73static inline struct btrfs_root *
74btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
75 struct btrfs_key *location)
76{
77 return btrfs_get_fs_root(fs_info, location, true);
78}
79
80int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
81void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
82void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
83void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
84 struct btrfs_root *root);
85void btrfs_free_fs_root(struct btrfs_root *root);
86
87#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
88struct 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 */
98static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
99{
100 if (refcount_inc_not_zero(&root->refs))
101 return root;
102 return NULL;
103}
104
105static inline void btrfs_put_fs_root(struct btrfs_root *root)
106{
107 if (refcount_dec_and_test(&root->refs))
108 kfree(root);
109}
110
111void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
112int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
113 int atomic);
114int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
115 struct btrfs_key *first_key);
116blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
117 enum btrfs_wq_endio_type metadata);
118blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
119 int mirror_num, unsigned long bio_flags,
120 u64 bio_offset, void *private_data,
121 extent_submit_bio_start_t *submit_bio_start);
122blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
123 int mirror_num);
124int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
125 struct btrfs_fs_info *fs_info);
126int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
127 struct btrfs_root *root);
128void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
129 struct btrfs_fs_info *fs_info);
130void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
131 struct btrfs_fs_info *fs_info);
132struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
133 u64 objectid);
134int btree_lock_page_hook(struct page *page, void *data,
135 void (*flush_fn)(void *));
136struct extent_map *btree_get_extent(struct btrfs_inode *inode,
137 struct page *page, size_t pg_offset, u64 start, u64 len,
138 int create);
139int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
140int __init btrfs_end_io_wq_init(void);
141void __cold btrfs_end_io_wq_exit(void);
142
143#ifdef CONFIG_DEBUG_LOCK_ALLOC
144void btrfs_init_lockdep(void);
145void btrfs_set_buffer_lockdep_class(u64 objectid,
146 struct extent_buffer *eb, int level);
147#else
148static inline void btrfs_init_lockdep(void)
149{ }
150static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
151 struct extent_buffer *eb, int level)
152{
153}
154#endif
155
156#endif
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_MIRROR_MAX 3
10#define BTRFS_SUPER_MIRROR_SHIFT 12
11
12/*
13 * Fixed blocksize for all devices, applies to specific ways of reading
14 * metadata like superblock. Must meet the set_blocksize requirements.
15 *
16 * Do not change.
17 */
18#define BTRFS_BDEV_BLOCKSIZE (4096)
19
20static inline u64 btrfs_sb_offset(int mirror)
21{
22 u64 start = SZ_16K;
23 if (mirror)
24 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
25 return BTRFS_SUPER_INFO_OFFSET;
26}
27
28struct btrfs_device;
29struct btrfs_fs_devices;
30struct btrfs_tree_parent_check;
31
32void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
33void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
34struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
35 struct btrfs_tree_parent_check *check);
36struct extent_buffer *btrfs_find_create_tree_block(
37 struct btrfs_fs_info *fs_info,
38 u64 bytenr, u64 owner_root,
39 int level);
40int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
41int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
42 const struct btrfs_super_block *disk_sb);
43int __cold open_ctree(struct super_block *sb,
44 struct btrfs_fs_devices *fs_devices,
45 char *options);
46void __cold close_ctree(struct btrfs_fs_info *fs_info);
47int btrfs_validate_super(struct btrfs_fs_info *fs_info,
48 struct btrfs_super_block *sb, int mirror_num);
49int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount);
50int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
51struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
52struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
53 int copy_num, bool drop_cache);
54int btrfs_commit_super(struct btrfs_fs_info *fs_info);
55struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
56 struct btrfs_key *key);
57int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
58 struct btrfs_root *root);
59void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
60
61struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
62 u64 objectid, bool check_ref);
63struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
64 u64 objectid, dev_t *anon_dev);
65struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
66 struct btrfs_path *path,
67 u64 objectid);
68int btrfs_global_root_insert(struct btrfs_root *root);
69void btrfs_global_root_delete(struct btrfs_root *root);
70struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
71 struct btrfs_key *key);
72struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);
73struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);
74struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info);
75
76void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
77void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
78void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
79void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
80 struct btrfs_root *root);
81int btrfs_validate_extent_buffer(struct extent_buffer *eb,
82 struct btrfs_tree_parent_check *check);
83#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
84struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
85#endif
86
87/*
88 * This function is used to grab the root, and avoid it is freed when we
89 * access it. But it doesn't ensure that the tree is not dropped.
90 *
91 * If you want to ensure the whole tree is safe, you should use
92 * fs_info->subvol_srcu
93 */
94static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
95{
96 if (!root)
97 return NULL;
98 if (refcount_inc_not_zero(&root->refs))
99 return root;
100 return NULL;
101}
102
103void btrfs_put_root(struct btrfs_root *root);
104void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans,
105 struct extent_buffer *buf);
106int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
107 int atomic);
108int btrfs_read_extent_buffer(struct extent_buffer *buf,
109 struct btrfs_tree_parent_check *check);
110
111blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio);
112int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
113 struct btrfs_root *root);
114int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
115 struct btrfs_fs_info *fs_info);
116int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
117 struct btrfs_root *root);
118void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
119 struct btrfs_fs_info *fs_info);
120void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
121 struct btrfs_fs_info *fs_info);
122struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
123 u64 objectid);
124int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
125int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);
126int btrfs_init_root_free_objectid(struct btrfs_root *root);
127
128#endif