2021-09-20 20:33:27 +08:00
|
|
|
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#ifndef _LINUX_BLK_INTEGRITY_H
|
|
|
|
#define _LINUX_BLK_INTEGRITY_H
|
|
|
|
|
|
|
|
#include <linux/blk-mq.h>
|
|
|
|
|
|
|
|
struct request;
|
|
|
|
|
|
|
|
enum blk_integrity_flags {
|
|
|
|
BLK_INTEGRITY_VERIFY = 1 << 0,
|
|
|
|
BLK_INTEGRITY_GENERATE = 1 << 1,
|
|
|
|
BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
|
|
|
|
BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
|
|
|
|
};
|
|
|
|
|
|
|
|
struct blk_integrity_iter {
|
|
|
|
void *prot_buf;
|
|
|
|
void *data_buf;
|
|
|
|
sector_t seed;
|
|
|
|
unsigned int data_size;
|
|
|
|
unsigned short interval;
|
2022-03-04 04:13:05 +08:00
|
|
|
unsigned char tuple_size;
|
2021-09-20 20:33:27 +08:00
|
|
|
const char *disk_name;
|
|
|
|
};
|
|
|
|
|
|
|
|
typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
|
|
|
|
typedef void (integrity_prepare_fn) (struct request *);
|
|
|
|
typedef void (integrity_complete_fn) (struct request *, unsigned int);
|
|
|
|
|
|
|
|
struct blk_integrity_profile {
|
|
|
|
integrity_processing_fn *generate_fn;
|
|
|
|
integrity_processing_fn *verify_fn;
|
|
|
|
integrity_prepare_fn *prepare_fn;
|
|
|
|
integrity_complete_fn *complete_fn;
|
|
|
|
const char *name;
|
|
|
|
};
|
|
|
|
|
|
|
|
#ifdef CONFIG_BLK_DEV_INTEGRITY
|
|
|
|
void blk_integrity_register(struct gendisk *, struct blk_integrity *);
|
|
|
|
void blk_integrity_unregister(struct gendisk *);
|
|
|
|
int blk_integrity_compare(struct gendisk *, struct gendisk *);
|
|
|
|
int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
|
|
|
|
struct scatterlist *);
|
|
|
|
int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
|
|
|
|
|
|
|
|
static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
|
|
|
|
{
|
|
|
|
struct blk_integrity *bi = &disk->queue->integrity;
|
|
|
|
|
|
|
|
if (!bi->profile)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
return bi;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline struct blk_integrity *
|
|
|
|
bdev_get_integrity(struct block_device *bdev)
|
|
|
|
{
|
|
|
|
return blk_get_integrity(bdev->bd_disk);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline bool
|
|
|
|
blk_integrity_queue_supports_integrity(struct request_queue *q)
|
|
|
|
{
|
|
|
|
return q->integrity.profile;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void blk_queue_max_integrity_segments(struct request_queue *q,
|
|
|
|
unsigned int segs)
|
|
|
|
{
|
|
|
|
q->limits.max_integrity_segments = segs;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline unsigned short
|
|
|
|
queue_max_integrity_segments(const struct request_queue *q)
|
|
|
|
{
|
|
|
|
return q->limits.max_integrity_segments;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* bio_integrity_intervals - Return number of integrity intervals for a bio
|
|
|
|
* @bi: blk_integrity profile for device
|
|
|
|
* @sectors: Size of the bio in 512-byte sectors
|
|
|
|
*
|
|
|
|
* Description: The block layer calculates everything in 512 byte
|
|
|
|
* sectors but integrity metadata is done in terms of the data integrity
|
|
|
|
* interval size of the storage device. Convert the block layer sectors
|
|
|
|
* to the appropriate number of integrity intervals.
|
|
|
|
*/
|
|
|
|
static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
|
|
|
|
unsigned int sectors)
|
|
|
|
{
|
|
|
|
return sectors >> (bi->interval_exp - 9);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
|
|
|
|
unsigned int sectors)
|
|
|
|
{
|
|
|
|
return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline bool blk_integrity_rq(struct request *rq)
|
|
|
|
{
|
|
|
|
return rq->cmd_flags & REQ_INTEGRITY;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Return the first bvec that contains integrity data. Only drivers that are
|
|
|
|
* limited to a single integrity segment should use this helper.
|
|
|
|
*/
|
|
|
|
static inline struct bio_vec *rq_integrity_vec(struct request *rq)
|
|
|
|
{
|
|
|
|
if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
|
|
|
|
return NULL;
|
|
|
|
return rq->bio->bi_integrity->bip_vec;
|
|
|
|
}
|
|
|
|
#else /* CONFIG_BLK_DEV_INTEGRITY */
|
|
|
|
static inline int blk_rq_count_integrity_sg(struct request_queue *q,
|
|
|
|
struct bio *b)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static inline int blk_rq_map_integrity_sg(struct request_queue *q,
|
|
|
|
struct bio *b,
|
|
|
|
struct scatterlist *s)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
|
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
|
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
static inline bool
|
|
|
|
blk_integrity_queue_supports_integrity(struct request_queue *q)
|
|
|
|
{
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static inline void blk_integrity_register(struct gendisk *d,
|
|
|
|
struct blk_integrity *b)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
static inline void blk_integrity_unregister(struct gendisk *d)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
static inline void blk_queue_max_integrity_segments(struct request_queue *q,
|
|
|
|
unsigned int segs)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
static inline unsigned short
|
|
|
|
queue_max_integrity_segments(const struct request_queue *q)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
|
|
|
|
unsigned int sectors)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
|
|
|
|
unsigned int sectors)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static inline int blk_integrity_rq(struct request *rq)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline struct bio_vec *rq_integrity_vec(struct request *rq)
|
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_BLK_DEV_INTEGRITY */
|
|
|
|
#endif /* _LINUX_BLK_INTEGRITY_H */
|