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192.168.1.100 / T103 / 1f884588077ad3476b9c91cbb0ee9ee0332bbb68 / . / src / kernel / linux / v4.14 / fs / btrfs / disk-io.h
blob: 7f7c35d6347a39107ee0d43e4160b7ca7efabdc8 [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame^]1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#ifndef __DISKIO__
20#define __DISKIO__
21
22#define BTRFS_SUPER_INFO_OFFSET SZ_64K
23#define BTRFS_SUPER_INFO_SIZE 4096
24
25#define BTRFS_SUPER_MIRROR_MAX 3
26#define BTRFS_SUPER_MIRROR_SHIFT 12
27
28/*
29 * Fixed blocksize for all devices, applies to specific ways of reading
30 * metadata like superblock. Must meet the set_blocksize requirements.
31 *
32 * Do not change.
33 */
34#define BTRFS_BDEV_BLOCKSIZE (4096)
35
36enum btrfs_wq_endio_type {
37 BTRFS_WQ_ENDIO_DATA = 0,
38 BTRFS_WQ_ENDIO_METADATA = 1,
39 BTRFS_WQ_ENDIO_FREE_SPACE = 2,
40 BTRFS_WQ_ENDIO_RAID56 = 3,
41 BTRFS_WQ_ENDIO_DIO_REPAIR = 4,
42};
43
44static inline u64 btrfs_sb_offset(int mirror)
45{
46 u64 start = SZ_16K;
47 if (mirror)
48 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
49 return BTRFS_SUPER_INFO_OFFSET;
50}
51
52struct btrfs_device;
53struct btrfs_fs_devices;
54
55struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info,
56 u64 bytenr, u64 parent_transid);
57void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
58int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr,
59 int mirror_num, struct extent_buffer **eb);
60struct extent_buffer *btrfs_find_create_tree_block(
61 struct btrfs_fs_info *fs_info,
62 u64 bytenr);
63void clean_tree_block(struct btrfs_fs_info *fs_info, struct extent_buffer *buf);
64int open_ctree(struct super_block *sb,
65 struct btrfs_fs_devices *fs_devices,
66 char *options);
67void close_ctree(struct btrfs_fs_info *fs_info);
68int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
69struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
70int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
71 struct buffer_head **bh_ret);
72int btrfs_commit_super(struct btrfs_fs_info *fs_info);
73struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
74 struct btrfs_key *location);
75int btrfs_init_fs_root(struct btrfs_root *root);
76struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
77 u64 root_id);
78int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
79 struct btrfs_root *root);
80void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
81
82struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
83 struct btrfs_key *key,
84 bool check_ref);
85static inline struct btrfs_root *
86btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
87 struct btrfs_key *location)
88{
89 return btrfs_get_fs_root(fs_info, location, true);
90}
91
92int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
93void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
94void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
95void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
96 struct btrfs_root *root);
97void btrfs_free_fs_root(struct btrfs_root *root);
98
99#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
100struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
101#endif
102
103/*
104 * This function is used to grab the root, and avoid it is freed when we
105 * access it. But it doesn't ensure that the tree is not dropped.
106 *
107 * If you want to ensure the whole tree is safe, you should use
108 * fs_info->subvol_srcu
109 */
110static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
111{
112 if (refcount_inc_not_zero(&root->refs))
113 return root;
114 return NULL;
115}
116
117static inline void btrfs_put_fs_root(struct btrfs_root *root)
118{
119 if (refcount_dec_and_test(&root->refs))
120 kfree(root);
121}
122
123void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
124int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
125 int atomic);
126int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
127u32 btrfs_csum_data(const char *data, u32 seed, size_t len);
128void btrfs_csum_final(u32 crc, u8 *result);
129blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
130 enum btrfs_wq_endio_type metadata);
131blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
132 int mirror_num, unsigned long bio_flags,
133 u64 bio_offset, void *private_data,
134 extent_submit_bio_hook_t *submit_bio_start,
135 extent_submit_bio_hook_t *submit_bio_done);
136unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
137int btrfs_write_tree_block(struct extent_buffer *buf);
138void btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
139int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
140 struct btrfs_fs_info *fs_info);
141int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
142 struct btrfs_root *root);
143void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
144 struct btrfs_fs_info *fs_info);
145void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
146 struct btrfs_fs_info *fs_info);
147struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
148 struct btrfs_fs_info *fs_info,
149 u64 objectid);
150int btree_lock_page_hook(struct page *page, void *data,
151 void (*flush_fn)(void *));
152int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
153int __init btrfs_end_io_wq_init(void);
154void btrfs_end_io_wq_exit(void);
155
156#ifdef CONFIG_DEBUG_LOCK_ALLOC
157void btrfs_init_lockdep(void);
158void btrfs_set_buffer_lockdep_class(u64 objectid,
159 struct extent_buffer *eb, int level);
160#else
161static inline void btrfs_init_lockdep(void)
162{ }
163static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
164 struct extent_buffer *eb, int level)
165{
166}
167#endif
168#endif