1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. |
4 | * Copyright (C) 2022 Christoph Hellwig. |
5 | */ |
6 | |
7 | #ifndef BTRFS_BIO_H |
8 | #define BTRFS_BIO_H |
9 | |
10 | #include <linux/bio.h> |
11 | #include <linux/workqueue.h> |
12 | #include "tree-checker.h" |
13 | |
14 | struct btrfs_bio; |
15 | struct btrfs_fs_info; |
16 | |
17 | #define BTRFS_BIO_INLINE_CSUM_SIZE 64 |
18 | |
19 | /* |
20 | * Maximum number of sectors for a single bio to limit the size of the |
21 | * checksum array. This matches the number of bio_vecs per bio and thus the |
22 | * I/O size for buffered I/O. |
23 | */ |
24 | #define BTRFS_MAX_BIO_SECTORS (256) |
25 | |
26 | typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio); |
27 | |
28 | /* |
29 | * Highlevel btrfs I/O structure. It is allocated by btrfs_bio_alloc and |
30 | * passed to btrfs_submit_bio for mapping to the physical devices. |
31 | */ |
32 | struct btrfs_bio { |
33 | /* |
34 | * Inode and offset into it that this I/O operates on. |
35 | * Only set for data I/O. |
36 | */ |
37 | struct btrfs_inode *inode; |
38 | u64 file_offset; |
39 | |
40 | union { |
41 | /* |
42 | * For data reads: checksumming and original I/O information. |
43 | * (for internal use in the btrfs_submit_bio machinery only) |
44 | */ |
45 | struct { |
46 | u8 *csum; |
47 | u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; |
48 | struct bvec_iter saved_iter; |
49 | }; |
50 | |
51 | /* |
52 | * For data writes: |
53 | * - ordered extent covering the bio |
54 | * - pointer to the checksums for this bio |
55 | * - original physical address from the allocator |
56 | * (for zone append only) |
57 | */ |
58 | struct { |
59 | struct btrfs_ordered_extent *ordered; |
60 | struct btrfs_ordered_sum *sums; |
61 | u64 orig_physical; |
62 | }; |
63 | |
64 | /* For metadata reads: parentness verification. */ |
65 | struct btrfs_tree_parent_check parent_check; |
66 | }; |
67 | |
68 | /* End I/O information supplied to btrfs_bio_alloc */ |
69 | btrfs_bio_end_io_t end_io; |
70 | void *private; |
71 | |
72 | /* For internal use in read end I/O handling */ |
73 | unsigned int mirror_num; |
74 | atomic_t pending_ios; |
75 | struct work_struct end_io_work; |
76 | |
77 | /* File system that this I/O operates on. */ |
78 | struct btrfs_fs_info *fs_info; |
79 | |
80 | /* |
81 | * This member must come last, bio_alloc_bioset will allocate enough |
82 | * bytes for entire btrfs_bio but relies on bio being last. |
83 | */ |
84 | struct bio bio; |
85 | }; |
86 | |
87 | static inline struct btrfs_bio *btrfs_bio(struct bio *bio) |
88 | { |
89 | return container_of(bio, struct btrfs_bio, bio); |
90 | } |
91 | |
92 | int __init btrfs_bioset_init(void); |
93 | void __cold btrfs_bioset_exit(void); |
94 | |
95 | void btrfs_bio_init(struct btrfs_bio *bbio, struct btrfs_fs_info *fs_info, |
96 | btrfs_bio_end_io_t end_io, void *private); |
97 | struct btrfs_bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf, |
98 | struct btrfs_fs_info *fs_info, |
99 | btrfs_bio_end_io_t end_io, void *private); |
100 | void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status); |
101 | |
102 | /* Submit using blkcg_punt_bio_submit. */ |
103 | #define REQ_BTRFS_CGROUP_PUNT REQ_FS_PRIVATE |
104 | |
105 | void btrfs_submit_bio(struct btrfs_bio *bbio, int mirror_num); |
106 | void btrfs_submit_repair_write(struct btrfs_bio *bbio, int mirror_num, bool dev_replace); |
107 | int btrfs_repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, |
108 | u64 length, u64 logical, struct page *page, |
109 | unsigned int pg_offset, int mirror_num); |
110 | |
111 | #endif |
112 | |