Commit 2e3258ec authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

block: add blk_rq_payload_bytes 



Add a helper to calculate the actual data transfer size for special
payload requests.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent f99e8648

include/linux/blkdev.h

+13 −0
Original line number Diff line number Diff line
@@ -1000,6 +1000,19 @@ static inline unsigned int blk_rq_cur_sectors(const struct request *rq) 
	return blk_rq_cur_bytes(rq) >> 9;

}



/*

 * Some commands like WRITE SAME have a payload or data transfer size which

 * is different from the size of the request.  Any driver that supports such

 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to

 * calculate the data transfer size.

 */

static inline unsigned int blk_rq_payload_bytes(struct request *rq)

{

	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)

		return rq->special_vec.bv_len;

	return blk_rq_bytes(rq);

}



static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,

						     int op)

{