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9888c340 1/* SPDX-License-Identifier: GPL-2.0 */
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2/*
3 * Copyright (C) 2007 Oracle. All rights reserved.
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4 */
5
9888c340
DS
6#ifndef BTRFS_DISK_IO_H
7#define BTRFS_DISK_IO_H
eb60ceac 8
ee22184b 9#define BTRFS_SUPER_INFO_OFFSET SZ_64K
f2984462 10#define BTRFS_SUPER_INFO_SIZE 4096
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YZ
11
12#define BTRFS_SUPER_MIRROR_MAX 3
13#define BTRFS_SUPER_MIRROR_SHIFT 12
14
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DS
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
bfebd8b5 23enum btrfs_wq_endio_type {
bbe339cc
DS
24 BTRFS_WQ_ENDIO_DATA,
25 BTRFS_WQ_ENDIO_METADATA,
26 BTRFS_WQ_ENDIO_FREE_SPACE,
27 BTRFS_WQ_ENDIO_RAID56,
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DW
28};
29
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YZ
30static inline u64 btrfs_sb_offset(int mirror)
31{
ee22184b 32 u64 start = SZ_16K;
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33 if (mirror)
34 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
35 return BTRFS_SUPER_INFO_OFFSET;
36}
37
0b86a832 38struct btrfs_device;
8a4b83cc 39struct btrfs_fs_devices;
e20d96d6 40
bd647ce3 41void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
8260edba 42void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
e064d5e9 43int btrfs_verify_level_key(struct extent_buffer *eb, int level,
448de471 44 struct btrfs_key *first_key, u64 parent_transid);
581c1760 45struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
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46 u64 owner_root, u64 parent_transid,
47 int level, struct btrfs_key *first_key);
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48struct extent_buffer *btrfs_find_create_tree_block(
49 struct btrfs_fs_info *fs_info,
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50 u64 bytenr, u64 owner_root,
51 int level);
6a884d7d 52void btrfs_clean_tree_block(struct extent_buffer *buf);
8cd29088 53void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info);
44c0ca21 54int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
b105e927 55int __cold open_ctree(struct super_block *sb,
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AV
56 struct btrfs_fs_devices *fs_devices,
57 char *options);
b105e927 58void __cold close_ctree(struct btrfs_fs_info *fs_info);
eece6a9c 59int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
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JT
60struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
61struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
62 int copy_num);
6bccf3ab 63int btrfs_commit_super(struct btrfs_fs_info *fs_info);
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JB
64struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
65 struct btrfs_key *key);
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66int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
67 struct btrfs_root *root);
faa2dbf0 68void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
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69
70struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
56e9357a 71 u64 objectid, bool check_ref);
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72struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
73 u64 objectid, dev_t anon_dev);
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74struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
75 struct btrfs_path *path,
76 u64 objectid);
c00869f1 77
0d4b0463 78void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
c146afad 79int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
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80void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
81void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
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82void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
83 struct btrfs_root *root);
8e1dc982 84int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio,
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NB
85 struct page *page, u64 start, u64 end,
86 int mirror);
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87blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
88 int mirror_num, unsigned long bio_flags);
06ea65a3 89#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
da17066c 90struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
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91#endif
92
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93/*
94 * This function is used to grab the root, and avoid it is freed when we
95 * access it. But it doesn't ensure that the tree is not dropped.
96 *
97 * If you want to ensure the whole tree is safe, you should use
98 * fs_info->subvol_srcu
99 */
00246528 100static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
b0feb9d9 101{
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102 if (!root)
103 return NULL;
0700cea7 104 if (refcount_inc_not_zero(&root->refs))
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105 return root;
106 return NULL;
107}
108
8c38938c 109void btrfs_put_root(struct btrfs_root *root);
5f39d397 110void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
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111int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
112 int atomic);
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113int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
114 struct btrfs_key *first_key);
4e4cbee9 115blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
bfebd8b5 116 enum btrfs_wq_endio_type metadata);
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117blk_status_t btrfs_wq_submit_bio(struct inode *inode, struct bio *bio,
118 int mirror_num, unsigned long bio_flags,
1941b64b 119 u64 dio_file_offset,
8896a08d 120 extent_submit_bio_start_t *submit_bio_start);
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DS
121blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
122 int mirror_num);
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NA
123int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
124 struct btrfs_root *root);
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125int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
126 struct btrfs_fs_info *fs_info);
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127int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
128 struct btrfs_root *root);
c79a1751 129void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
2ff7e61e 130 struct btrfs_fs_info *fs_info);
49b25e05 131void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
2ff7e61e 132 struct btrfs_fs_info *fs_info);
20897f5c 133struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
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AJ
134 u64 objectid);
135int btree_lock_page_hook(struct page *page, void *data,
136 void (*flush_fn)(void *));
943c6e99 137int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
543068a2 138int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);
453e4873 139int btrfs_init_root_free_objectid(struct btrfs_root *root);
97eb6b69 140int __init btrfs_end_io_wq_init(void);
e67c718b 141void __cold btrfs_end_io_wq_exit(void);
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142
143#ifdef CONFIG_DEBUG_LOCK_ALLOC
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144void btrfs_set_buffer_lockdep_class(u64 objectid,
145 struct extent_buffer *eb, int level);
4008c04a 146#else
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147static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
148 struct extent_buffer *eb, int level)
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CM
149{
150}
151#endif
9888c340 152
eb60ceac 153#endif