Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_BIO_INTEGRITY_H
3#define _LINUX_BIO_INTEGRITY_H
4
5#include <linux/bio.h>
6
7enum bip_flags {
8 BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */
9 BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */
10 BIP_DISK_NOCHECK = 1 << 2, /* disable disk integrity checking */
11 BIP_IP_CHECKSUM = 1 << 3, /* IP checksum */
12 BIP_COPY_USER = 1 << 4, /* Kernel bounce buffer in use */
13 BIP_CHECK_GUARD = 1 << 5, /* guard check */
14 BIP_CHECK_REFTAG = 1 << 6, /* reftag check */
15 BIP_CHECK_APPTAG = 1 << 7, /* apptag check */
16};
17
18struct bio_integrity_payload {
19 struct bvec_iter bip_iter;
20
21 unsigned short bip_vcnt; /* # of integrity bio_vecs */
22 unsigned short bip_max_vcnt; /* integrity bio_vec slots */
23 unsigned short bip_flags; /* control flags */
24 u16 app_tag; /* application tag value */
25
26 struct bio_vec *bip_vec;
27};
28
29#define BIP_CLONE_FLAGS (BIP_MAPPED_INTEGRITY | BIP_IP_CHECKSUM | \
30 BIP_CHECK_GUARD | BIP_CHECK_REFTAG | BIP_CHECK_APPTAG)
31
32#ifdef CONFIG_BLK_DEV_INTEGRITY
33
34#define bip_for_each_vec(bvl, bip, iter) \
35 for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
36
37#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
38 for_each_bio(_bio) \
39 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
40
41static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
42{
43 if (bio->bi_opf & REQ_INTEGRITY)
44 return bio->bi_integrity;
45
46 return NULL;
47}
48
49static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
50{
51 struct bio_integrity_payload *bip = bio_integrity(bio);
52
53 if (bip)
54 return bip->bip_flags & flag;
55
56 return false;
57}
58
59static inline sector_t bip_get_seed(struct bio_integrity_payload *bip)
60{
61 return bip->bip_iter.bi_sector;
62}
63
64static inline void bip_set_seed(struct bio_integrity_payload *bip,
65 sector_t seed)
66{
67 bip->bip_iter.bi_sector = seed;
68}
69
70void bio_integrity_init(struct bio *bio, struct bio_integrity_payload *bip,
71 struct bio_vec *bvecs, unsigned int nr_vecs);
72struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, gfp_t gfp,
73 unsigned int nr);
74int bio_integrity_add_page(struct bio *bio, struct page *page, unsigned int len,
75 unsigned int offset);
76int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter);
77int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta);
78void bio_integrity_unmap_user(struct bio *bio);
79bool bio_integrity_prep(struct bio *bio);
80void bio_integrity_advance(struct bio *bio, unsigned int bytes_done);
81void bio_integrity_trim(struct bio *bio);
82int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask);
83
84#else /* CONFIG_BLK_DEV_INTEGRITY */
85
86static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
87{
88 return NULL;
89}
90
91static inline int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter)
92{
93 return -EINVAL;
94}
95
96static inline int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta)
97{
98 return -EINVAL;
99}
100
101static inline void bio_integrity_unmap_user(struct bio *bio)
102{
103}
104
105static inline bool bio_integrity_prep(struct bio *bio)
106{
107 return true;
108}
109
110static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
111 gfp_t gfp_mask)
112{
113 return 0;
114}
115
116static inline void bio_integrity_advance(struct bio *bio,
117 unsigned int bytes_done)
118{
119}
120
121static inline void bio_integrity_trim(struct bio *bio)
122{
123}
124
125static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
126{
127 return false;
128}
129
130static inline struct bio_integrity_payload *
131bio_integrity_alloc(struct bio *bio, gfp_t gfp, unsigned int nr)
132{
133 return ERR_PTR(-EINVAL);
134}
135
136static inline int bio_integrity_add_page(struct bio *bio, struct page *page,
137 unsigned int len, unsigned int offset)
138{
139 return 0;
140}
141#endif /* CONFIG_BLK_DEV_INTEGRITY */
142#endif /* _LINUX_BIO_INTEGRITY_H */