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Commit 3aef3cae authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

block: add a req_bvec helper 



Return the currently active bvec segment, potentially spanning multiple
pages.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarKeith Busch <keith.busch@intel.com>
Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
Reviewed-by: default avatarChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
parent 39f8e364

include/linux/blkdev.h

+11 −0
Original line number Diff line number Diff line
@@ -932,6 +932,17 @@ static inline unsigned int blk_rq_payload_bytes(struct request *rq) 
	return blk_rq_bytes(rq);

}



/*

 * Return the first full biovec in the request.  The caller needs to check that

 * there are any bvecs before calling this helper.

 */

static inline struct bio_vec req_bvec(struct request *rq)

{

	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)

		return rq->special_vec;

	return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter);

}



static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,

						     int op)

{