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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};
17
18struct bio_integrity_payload {
19 struct bio *bip_bio; /* parent bio */
20
21 struct bvec_iter bip_iter;
22
23 unsigned short bip_vcnt; /* # of integrity bio_vecs */
24 unsigned short bip_max_vcnt; /* integrity bio_vec slots */
25 unsigned short bip_flags; /* control flags */
26 u16 app_tag; /* application tag value */
27
28 struct bvec_iter bio_iter; /* for rewinding parent bio */
29
30 struct work_struct bip_work; /* I/O completion */
31
32 struct bio_vec *bip_vec;
33 struct bio_vec bip_inline_vecs[];/* embedded bvec array */
34};
35
36#define BIP_CLONE_FLAGS (BIP_MAPPED_INTEGRITY | BIP_IP_CHECKSUM | \
37 BIP_CHECK_GUARD | BIP_CHECK_REFTAG | BIP_CHECK_APPTAG)
38
39#ifdef CONFIG_BLK_DEV_INTEGRITY
40
41#define bip_for_each_vec(bvl, bip, iter) \
42 for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
43
44#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
45 for_each_bio(_bio) \
46 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
47
48static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
49{
50 if (bio->bi_opf & REQ_INTEGRITY)
51 return bio->bi_integrity;
52
53 return NULL;
54}
55
56static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
57{
58 struct bio_integrity_payload *bip = bio_integrity(bio);
59
60 if (bip)
61 return bip->bip_flags & flag;
62
63 return false;
64}
65
66static inline sector_t bip_get_seed(struct bio_integrity_payload *bip)
67{
68 return bip->bip_iter.bi_sector;
69}
70
71static inline void bip_set_seed(struct bio_integrity_payload *bip,
72 sector_t seed)
73{
74 bip->bip_iter.bi_sector = seed;
75}
76
77struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, gfp_t gfp,
78 unsigned int nr);
79int bio_integrity_add_page(struct bio *bio, struct page *page, unsigned int len,
80 unsigned int offset);
81int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter);
82int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta);
83void bio_integrity_unmap_user(struct bio *bio);
84bool bio_integrity_prep(struct bio *bio);
85void bio_integrity_advance(struct bio *bio, unsigned int bytes_done);
86void bio_integrity_trim(struct bio *bio);
87int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask);
88int bioset_integrity_create(struct bio_set *bs, int pool_size);
89void bioset_integrity_free(struct bio_set *bs);
90void bio_integrity_init(void);
91
92#else /* CONFIG_BLK_DEV_INTEGRITY */
93
94static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
95{
96 return NULL;
97}
98
99static inline int bioset_integrity_create(struct bio_set *bs, int pool_size)
100{
101 return 0;
102}
103
104static inline void bioset_integrity_free(struct bio_set *bs)
105{
106}
107
108static inline int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter)
109{
110 return -EINVAL;
111}
112
113static inline int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta)
114{
115 return -EINVAL;
116}
117
118static inline void bio_integrity_unmap_user(struct bio *bio)
119{
120}
121
122static inline bool bio_integrity_prep(struct bio *bio)
123{
124 return true;
125}
126
127static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
128 gfp_t gfp_mask)
129{
130 return 0;
131}
132
133static inline void bio_integrity_advance(struct bio *bio,
134 unsigned int bytes_done)
135{
136}
137
138static inline void bio_integrity_trim(struct bio *bio)
139{
140}
141
142static inline void bio_integrity_init(void)
143{
144}
145
146static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
147{
148 return false;
149}
150
151static inline struct bio_integrity_payload *
152bio_integrity_alloc(struct bio *bio, gfp_t gfp, unsigned int nr)
153{
154 return ERR_PTR(-EINVAL);
155}
156
157static inline int bio_integrity_add_page(struct bio *bio, struct page *page,
158 unsigned int len, unsigned int offset)
159{
160 return 0;
161}
162#endif /* CONFIG_BLK_DEV_INTEGRITY */
163#endif /* _LINUX_BIO_INTEGRITY_H */