linux/include/linux/blk-integrity.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_BLK_INTEGRITY_H
#define _LINUX_BLK_INTEGRITY_H

#include <linux/blk-mq.h>
#include <linux/bio-integrity.h>

struct request;

enum blk_integrity_flags { … };

const char *blk_integrity_profile_name(struct blk_integrity *bi);
bool queue_limits_stack_integrity(struct queue_limits *t,
		struct queue_limits *b);
static inline bool queue_limits_stack_integrity_bdev(struct queue_limits *t,
		struct block_device *bdev)
{ … }

#ifdef CONFIG_BLK_DEV_INTEGRITY
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 bool
blk_integrity_queue_supports_integrity(struct request_queue *q)
{ … }

static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
{ … }

static inline struct blk_integrity *
bdev_get_integrity(struct block_device *bdev)
{ … }

static inline unsigned short
queue_max_integrity_segments(const struct request_queue *q)
{ … }

/**
 * 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)
{ … }

static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
					       unsigned int sectors)
{ … }

static inline bool blk_integrity_rq(struct request *rq)
{ … }

/*
 * Return the current bvec that contains the integrity data. bip_iter may be
 * advanced to iterate over the integrity data.
 */
static inline struct bio_vec rq_integrity_vec(struct request *rq)
{ … }
#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 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)
{
	/* the optimizer will remove all calls to this function */
	return (struct bio_vec){ };
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */

#endif /* _LINUX_BLK_INTEGRITY_H */