Linux kernel mirror (for testing)
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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_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */
11 BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */
12 BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */
13 BIP_COPY_USER = 1 << 5, /* Kernel bounce buffer in use */
14};
15
16struct bio_integrity_payload {
17 struct bio *bip_bio; /* parent bio */
18
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
25 struct bvec_iter bio_iter; /* for rewinding parent bio */
26
27 struct work_struct bip_work; /* I/O completion */
28
29 struct bio_vec *bip_vec;
30 struct bio_vec bip_inline_vecs[];/* embedded bvec array */
31};
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
71struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, gfp_t gfp,
72 unsigned int nr);
73int bio_integrity_add_page(struct bio *bio, struct page *page, unsigned int len,
74 unsigned int offset);
75int bio_integrity_map_user(struct bio *bio, void __user *ubuf, ssize_t len);
76void bio_integrity_unmap_user(struct bio *bio);
77bool bio_integrity_prep(struct bio *bio);
78void bio_integrity_advance(struct bio *bio, unsigned int bytes_done);
79void bio_integrity_trim(struct bio *bio);
80int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask);
81int bioset_integrity_create(struct bio_set *bs, int pool_size);
82void bioset_integrity_free(struct bio_set *bs);
83void bio_integrity_init(void);
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 bioset_integrity_create(struct bio_set *bs, int pool_size)
93{
94 return 0;
95}
96
97static inline void bioset_integrity_free(struct bio_set *bs)
98{
99}
100
101static inline int bio_integrity_map_user(struct bio *bio, void __user *ubuf,
102 ssize_t len)
103{
104 return -EINVAL;
105}
106
107static inline void bio_integrity_unmap_user(struct bio *bio)
108{
109}
110
111static inline bool bio_integrity_prep(struct bio *bio)
112{
113 return true;
114}
115
116static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
117 gfp_t gfp_mask)
118{
119 return 0;
120}
121
122static inline void bio_integrity_advance(struct bio *bio,
123 unsigned int bytes_done)
124{
125}
126
127static inline void bio_integrity_trim(struct bio *bio)
128{
129}
130
131static inline void bio_integrity_init(void)
132{
133}
134
135static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
136{
137 return false;
138}
139
140static inline struct bio_integrity_payload *
141bio_integrity_alloc(struct bio *bio, gfp_t gfp, unsigned int nr)
142{
143 return ERR_PTR(-EINVAL);
144}
145
146static inline int bio_integrity_add_page(struct bio *bio, struct page *page,
147 unsigned int len, unsigned int offset)
148{
149 return 0;
150}
151#endif /* CONFIG_BLK_DEV_INTEGRITY */
152#endif /* _LINUX_BIO_INTEGRITY_H */