tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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};
29
30static 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
38struct btrfs_device;
39struct btrfs_fs_devices;
40
41void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
42void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
43int btrfs_verify_level_key(struct extent_buffer *eb, int level,
44 struct btrfs_key *first_key, u64 parent_transid);
45struct 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);
48void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
49struct extent_buffer *btrfs_find_create_tree_block(
50 struct btrfs_fs_info *fs_info,
51 u64 bytenr);
52void btrfs_clean_tree_block(struct extent_buffer *buf);
53int __cold open_ctree(struct super_block *sb,
54 struct btrfs_fs_devices *fs_devices,
55 char *options);
56void __cold close_ctree(struct btrfs_fs_info *fs_info);
57int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
58struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
59struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
60 int copy_num);
61int btrfs_commit_super(struct btrfs_fs_info *fs_info);
62struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
63 struct btrfs_key *key);
64int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
65 struct btrfs_root *root);
66void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
67
68struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
69 u64 objectid, bool check_ref);
70
71void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
72int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
73void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
74void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
75void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
76 struct btrfs_root *root);
77
78#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
79struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
80#endif
81
82/*
83 * This function is used to grab the root, and avoid it is freed when we
84 * access it. But it doesn't ensure that the tree is not dropped.
85 *
86 * If you want to ensure the whole tree is safe, you should use
87 * fs_info->subvol_srcu
88 */
89static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
90{
91 if (!root)
92 return NULL;
93 if (refcount_inc_not_zero(&root->refs))
94 return root;
95 return NULL;
96}
97
98void btrfs_put_root(struct btrfs_root *root);
99void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
100int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
101 int atomic);
102int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
103 struct btrfs_key *first_key);
104blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
105 enum btrfs_wq_endio_type metadata);
106blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
107 int mirror_num, unsigned long bio_flags,
108 u64 bio_offset, void *private_data,
109 extent_submit_bio_start_t *submit_bio_start);
110blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
111 int mirror_num);
112int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
113 struct btrfs_fs_info *fs_info);
114int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
115 struct btrfs_root *root);
116void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
117 struct btrfs_fs_info *fs_info);
118void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
119 struct btrfs_fs_info *fs_info);
120struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
121 u64 objectid);
122int btree_lock_page_hook(struct page *page, void *data,
123 void (*flush_fn)(void *));
124struct extent_map *btree_get_extent(struct btrfs_inode *inode,
125 struct page *page, size_t pg_offset,
126 u64 start, u64 len);
127int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
128int __init btrfs_end_io_wq_init(void);
129void __cold btrfs_end_io_wq_exit(void);
130
131#ifdef CONFIG_DEBUG_LOCK_ALLOC
132void btrfs_init_lockdep(void);
133void btrfs_set_buffer_lockdep_class(u64 objectid,
134 struct extent_buffer *eb, int level);
135#else
136static inline void btrfs_init_lockdep(void)
137{ }
138static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
139 struct extent_buffer *eb, int level)
140{
141}
142#endif
143
144#endif