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Commit 2e073969 authored by Julien Grall's avatar Julien Grall Committed by Konrad Rzeszutek Wilk
Browse files

xen-blkfront: Introduce blkif_ring_get_request 



The code to get a request is always the same. Therefore we can factorize
it in a single function.

Signed-off-by: default avatarJulien Grall <julien.grall@citrix.com>
Acked-by: default avatarRoger Pau Monné <roger.pau@citrix.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent a6e7af12

drivers/block/xen-blkfront.c

+19 −11
Original line number Diff line number Diff line
@@ -481,6 +481,23 @@ static int blkif_ioctl(struct block_device *bdev, fmode_t mode, 
	return 0;

}



static unsigned long blkif_ring_get_request(struct blkfront_ring_info *rinfo,

					    struct request *req,

					    struct blkif_request **ring_req)

{

	unsigned long id;



	*ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt);

	rinfo->ring.req_prod_pvt++;



	id = get_id_from_freelist(rinfo);

	rinfo->shadow[id].request = req;



	(*ring_req)->u.rw.id = id;



	return id;

}



static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_info *rinfo)

{

	struct blkfront_info *info = rinfo->dev_info;
@@ -488,9 +505,7 @@ static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_inf 
	unsigned long id;



	/* Fill out a communications ring structure. */

	ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt);

	id = get_id_from_freelist(rinfo);

	rinfo->shadow[id].request = req;

	id = blkif_ring_get_request(rinfo, req, &ring_req);



	ring_req->operation = BLKIF_OP_DISCARD;

	ring_req->u.discard.nr_sectors = blk_rq_sectors(req);
@@ -501,8 +516,6 @@ static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_inf 
	else

		ring_req->u.discard.flag = 0;



	rinfo->ring.req_prod_pvt++;



	/* Keep a private copy so we can reissue requests when recovering. */

	rinfo->shadow[id].req = *ring_req;
@@ -635,9 +648,7 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri 
		}



	/* Fill out a communications ring structure. */

	ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt);

	id = get_id_from_freelist(rinfo);

	rinfo->shadow[id].request = req;

	id = blkif_ring_get_request(rinfo, req, &ring_req);



	BUG_ON(info->max_indirect_segments == 0 &&

	       GREFS(req->nr_phys_segments) > BLKIF_MAX_SEGMENTS_PER_REQUEST);
@@ -650,7 +661,6 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri 
	for_each_sg(rinfo->shadow[id].sg, sg, num_sg, i)

	       num_grant += gnttab_count_grant(sg->offset, sg->length);



	ring_req->u.rw.id = id;

	rinfo->shadow[id].num_sg = num_sg;

	if (num_grant > BLKIF_MAX_SEGMENTS_PER_REQUEST) {

		/*
@@ -716,8 +726,6 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri 
	if (setup.segments)

		kunmap_atomic(setup.segments);



	rinfo->ring.req_prod_pvt++;



	/* Keep a private copy so we can reissue requests when recovering. */

	rinfo->shadow[id].req = *ring_req;