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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 BIP_MEMPOOL = 1 << 15, /* buffer backed by mempool */
18};
19
20struct bio_integrity_payload {
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 bio_vec *bip_vec;
29};
30
31#define BIP_CLONE_FLAGS (BIP_MAPPED_INTEGRITY | BIP_IP_CHECKSUM | \
32 BIP_CHECK_GUARD | BIP_CHECK_REFTAG | BIP_CHECK_APPTAG)
33
34#ifdef CONFIG_BLK_DEV_INTEGRITY
35
36#define bip_for_each_vec(bvl, bip, iter) \
37 for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
38
39#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
40 for_each_bio(_bio) \
41 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
42
43static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
44{
45 if (bio->bi_opf & REQ_INTEGRITY)
46 return bio->bi_integrity;
47
48 return NULL;
49}
50
51static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
52{
53 struct bio_integrity_payload *bip = bio_integrity(bio);
54
55 if (bip)
56 return bip->bip_flags & flag;
57
58 return false;
59}
60
61static inline sector_t bip_get_seed(struct bio_integrity_payload *bip)
62{
63 return bip->bip_iter.bi_sector;
64}
65
66static inline void bip_set_seed(struct bio_integrity_payload *bip,
67 sector_t seed)
68{
69 bip->bip_iter.bi_sector = seed;
70}
71
72void bio_integrity_init(struct bio *bio, struct bio_integrity_payload *bip,
73 struct bio_vec *bvecs, unsigned int nr_vecs);
74struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, gfp_t gfp,
75 unsigned int nr);
76int bio_integrity_add_page(struct bio *bio, struct page *page, unsigned int len,
77 unsigned int offset);
78int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter);
79int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta);
80void bio_integrity_unmap_user(struct bio *bio);
81bool bio_integrity_prep(struct bio *bio);
82void bio_integrity_advance(struct bio *bio, unsigned int bytes_done);
83void bio_integrity_trim(struct bio *bio);
84int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask);
85
86#else /* CONFIG_BLK_DEV_INTEGRITY */
87
88static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
89{
90 return NULL;
91}
92
93static inline int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter)
94{
95 return -EINVAL;
96}
97
98static inline int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta)
99{
100 return -EINVAL;
101}
102
103static inline void bio_integrity_unmap_user(struct bio *bio)
104{
105}
106
107static inline bool bio_integrity_prep(struct bio *bio)
108{
109 return true;
110}
111
112static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
113 gfp_t gfp_mask)
114{
115 return 0;
116}
117
118static inline void bio_integrity_advance(struct bio *bio,
119 unsigned int bytes_done)
120{
121}
122
123static inline void bio_integrity_trim(struct bio *bio)
124{
125}
126
127static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
128{
129 return false;
130}
131
132static inline struct bio_integrity_payload *
133bio_integrity_alloc(struct bio *bio, gfp_t gfp, unsigned int nr)
134{
135 return ERR_PTR(-EINVAL);
136}
137
138static inline int bio_integrity_add_page(struct bio *bio, struct page *page,
139 unsigned int len, unsigned int offset)
140{
141 return 0;
142}
143#endif /* CONFIG_BLK_DEV_INTEGRITY */
144
145void bio_integrity_alloc_buf(struct bio *bio, bool zero_buffer);
146void bio_integrity_free_buf(struct bio_integrity_payload *bip);
147
148#endif /* _LINUX_BIO_INTEGRITY_H */