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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_BIO_INTEGRITY_H
#define _LINUX_BIO_INTEGRITY_H
#include <linux/bio.h>
enum bip_flags {
BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */
BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */
BIP_DISK_NOCHECK = 1 << 2, /* disable disk integrity checking */
BIP_IP_CHECKSUM = 1 << 3, /* IP checksum */
BIP_COPY_USER = 1 << 4, /* Kernel bounce buffer in use */
BIP_CHECK_GUARD = 1 << 5, /* guard check */
BIP_CHECK_REFTAG = 1 << 6, /* reftag check */
BIP_CHECK_APPTAG = 1 << 7, /* apptag check */
};
struct bio_integrity_payload {
struct bvec_iter bip_iter;
unsigned short bip_vcnt; /* # of integrity bio_vecs */
unsigned short bip_max_vcnt; /* integrity bio_vec slots */
unsigned short bip_flags; /* control flags */
u16 app_tag; /* application tag value */
struct bio_vec *bip_vec;
};
#define BIP_CLONE_FLAGS (BIP_MAPPED_INTEGRITY | BIP_IP_CHECKSUM | \
BIP_CHECK_GUARD | BIP_CHECK_REFTAG | BIP_CHECK_APPTAG)
#ifdef CONFIG_BLK_DEV_INTEGRITY
#define bip_for_each_vec(bvl, bip, iter) \
for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
for_each_bio(_bio) \
bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
{
if (bio->bi_opf & REQ_INTEGRITY)
return bio->bi_integrity;
return NULL;
}
static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
{
struct bio_integrity_payload *bip = bio_integrity(bio);
if (bip)
return bip->bip_flags & flag;
return false;
}
static inline sector_t bip_get_seed(struct bio_integrity_payload *bip)
{
return bip->bip_iter.bi_sector;
}
static inline void bip_set_seed(struct bio_integrity_payload *bip,
sector_t seed)
{
bip->bip_iter.bi_sector = seed;
}
void bio_integrity_init(struct bio *bio, struct bio_integrity_payload *bip,
struct bio_vec *bvecs, unsigned int nr_vecs);
struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, gfp_t gfp,
unsigned int nr);
int bio_integrity_add_page(struct bio *bio, struct page *page, unsigned int len,
unsigned int offset);
int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter);
int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta);
void bio_integrity_unmap_user(struct bio *bio);
bool bio_integrity_prep(struct bio *bio);
void bio_integrity_advance(struct bio *bio, unsigned int bytes_done);
void bio_integrity_trim(struct bio *bio);
int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask);
#else /* CONFIG_BLK_DEV_INTEGRITY */
static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
{
return NULL;
}
static inline int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter)
{
return -EINVAL;
}
static inline int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta)
{
return -EINVAL;
}
static inline void bio_integrity_unmap_user(struct bio *bio)
{
}
static inline bool bio_integrity_prep(struct bio *bio)
{
return true;
}
static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
gfp_t gfp_mask)
{
return 0;
}
static inline void bio_integrity_advance(struct bio *bio,
unsigned int bytes_done)
{
}
static inline void bio_integrity_trim(struct bio *bio)
{
}
static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
{
return false;
}
static inline struct bio_integrity_payload *
bio_integrity_alloc(struct bio *bio, gfp_t gfp, unsigned int nr)
{
return ERR_PTR(-EINVAL);
}
static inline int bio_integrity_add_page(struct bio *bio, struct page *page,
unsigned int len, unsigned int offset)
{
return 0;
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */
#endif /* _LINUX_BIO_INTEGRITY_H */
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