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Linux kernel mirror (for testing)
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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_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;
30
31void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
32void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
33int btrfs_verify_level_key(struct extent_buffer *eb, int level,
34 struct btrfs_key *first_key, u64 parent_transid);
35struct 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);
38struct extent_buffer *btrfs_find_create_tree_block(
39 struct btrfs_fs_info *fs_info,
40 u64 bytenr, u64 owner_root,
41 int level);
42void btrfs_clean_tree_block(struct extent_buffer *buf);
43void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info);
44int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
45int __cold open_ctree(struct super_block *sb,
46 struct btrfs_fs_devices *fs_devices,
47 char *options);
48void __cold close_ctree(struct btrfs_fs_info *fs_info);
49int btrfs_validate_super(struct btrfs_fs_info *fs_info,
50 struct btrfs_super_block *sb, int mirror_num);
51int btrfs_check_features(struct btrfs_fs_info *fs_info, struct super_block *sb);
52int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
53struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
54struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
55 int copy_num, bool drop_cache);
56int btrfs_commit_super(struct btrfs_fs_info *fs_info);
57struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
58 struct btrfs_key *key);
59int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
60 struct btrfs_root *root);
61void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
62
63struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
64 u64 objectid, bool check_ref);
65struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
66 u64 objectid, dev_t anon_dev);
67struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
68 struct btrfs_path *path,
69 u64 objectid);
70int btrfs_global_root_insert(struct btrfs_root *root);
71void btrfs_global_root_delete(struct btrfs_root *root);
72struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
73 struct btrfs_key *key);
74struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);
75struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);
76
77void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
78int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
79void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
80void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
81void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
82 struct btrfs_root *root);
83int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio,
84 struct page *page, u64 start, u64 end,
85 int mirror);
86void btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, int mirror_num);
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_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
107static inline struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info)
108{
109 if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE))
110 return fs_info->block_group_root;
111 return btrfs_extent_root(fs_info, 0);
112}
113
114void btrfs_put_root(struct btrfs_root *root);
115void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
116int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
117 int atomic);
118int btrfs_read_extent_buffer(struct extent_buffer *buf, u64 parent_transid,
119 int level, struct btrfs_key *first_key);
120bool btrfs_wq_submit_bio(struct inode *inode, struct bio *bio, int mirror_num,
121 u64 dio_file_offset,
122 extent_submit_bio_start_t *submit_bio_start);
123blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
124 int mirror_num);
125int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
126 struct btrfs_root *root);
127int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
128 struct btrfs_fs_info *fs_info);
129int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
130 struct btrfs_root *root);
131void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
132 struct btrfs_fs_info *fs_info);
133void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
134 struct btrfs_fs_info *fs_info);
135struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
136 u64 objectid);
137int btree_lock_page_hook(struct page *page, void *data,
138 void (*flush_fn)(void *));
139int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
140int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);
141int btrfs_init_root_free_objectid(struct btrfs_root *root);
142
143#endif