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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 BIP_P2P_DMA = 1 << 8, /* using P2P address */
17};
18
19struct bio_integrity_payload {
20 struct bvec_iter bip_iter;
21
22 unsigned short bip_vcnt; /* # of integrity bio_vecs */
23 unsigned short bip_max_vcnt; /* integrity bio_vec slots */
24 unsigned short bip_flags; /* control flags */
25 u16 app_tag; /* application tag value */
26
27 struct bio_vec *bip_vec;
28};
29
30#define BIP_CLONE_FLAGS (BIP_MAPPED_INTEGRITY | BIP_IP_CHECKSUM | \
31 BIP_CHECK_GUARD | BIP_CHECK_REFTAG | BIP_CHECK_APPTAG)
32
33#ifdef CONFIG_BLK_DEV_INTEGRITY
34
35#define bip_for_each_vec(bvl, bip, iter) \
36 for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
37
38#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
39 for_each_bio(_bio) \
40 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
41
42static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
43{
44 if (bio->bi_opf & REQ_INTEGRITY)
45 return bio->bi_integrity;
46
47 return NULL;
48}
49
50static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
51{
52 struct bio_integrity_payload *bip = bio_integrity(bio);
53
54 if (bip)
55 return bip->bip_flags & flag;
56
57 return false;
58}
59
60static inline sector_t bip_get_seed(struct bio_integrity_payload *bip)
61{
62 return bip->bip_iter.bi_sector;
63}
64
65static inline void bip_set_seed(struct bio_integrity_payload *bip,
66 sector_t seed)
67{
68 bip->bip_iter.bi_sector = seed;
69}
70
71void bio_integrity_init(struct bio *bio, struct bio_integrity_payload *bip,
72 struct bio_vec *bvecs, unsigned int nr_vecs);
73struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, gfp_t gfp,
74 unsigned int nr);
75int bio_integrity_add_page(struct bio *bio, struct page *page, unsigned int len,
76 unsigned int offset);
77int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter);
78int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta);
79void bio_integrity_unmap_user(struct bio *bio);
80bool bio_integrity_prep(struct bio *bio);
81void bio_integrity_advance(struct bio *bio, unsigned int bytes_done);
82void bio_integrity_trim(struct bio *bio);
83int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask);
84
85#else /* CONFIG_BLK_DEV_INTEGRITY */
86
87static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
88{
89 return NULL;
90}
91
92static inline int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter)
93{
94 return -EINVAL;
95}
96
97static inline int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta)
98{
99 return -EINVAL;
100}
101
102static inline void bio_integrity_unmap_user(struct bio *bio)
103{
104}
105
106static inline bool bio_integrity_prep(struct bio *bio)
107{
108 return true;
109}
110
111static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
112 gfp_t gfp_mask)
113{
114 return 0;
115}
116
117static inline void bio_integrity_advance(struct bio *bio,
118 unsigned int bytes_done)
119{
120}
121
122static inline void bio_integrity_trim(struct bio *bio)
123{
124}
125
126static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
127{
128 return false;
129}
130
131static inline struct bio_integrity_payload *
132bio_integrity_alloc(struct bio *bio, gfp_t gfp, unsigned int nr)
133{
134 return ERR_PTR(-EINVAL);
135}
136
137static inline int bio_integrity_add_page(struct bio *bio, struct page *page,
138 unsigned int len, unsigned int offset)
139{
140 return 0;
141}
142#endif /* CONFIG_BLK_DEV_INTEGRITY */
143#endif /* _LINUX_BIO_INTEGRITY_H */