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xen-blkfront: Introduce blkif_ring_get_request

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

Signed-off-by: Julien Grall <julien.grall@citrix.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Julien Grall 2015-08-13 19:23:10 +01:00 committed by Konrad Rzeszutek Wilk
parent a6e7af1288
commit 2e073969d5
1 changed files with 19 additions and 11 deletions
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30
drivers/block/xen-blkfront.c
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@ -481,6 +481,23 @@ static int blkif_ioctl(struct block_device *bdev, fmode_t mode,
return 0; 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) static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_info *rinfo)
{ {
struct blkfront_info *info = rinfo->dev_info; 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; unsigned long id;
/* Fill out a communications ring structure. */ /* Fill out a communications ring structure. */
ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt); id = blkif_ring_get_request(rinfo, req, &ring_req);
id = get_id_from_freelist(rinfo);
rinfo->shadow[id].request = req;
ring_req->operation = BLKIF_OP_DISCARD; ring_req->operation = BLKIF_OP_DISCARD;
ring_req->u.discard.nr_sectors = blk_rq_sectors(req); 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 else
ring_req->u.discard.flag = 0; ring_req->u.discard.flag = 0;
rinfo->ring.req_prod_pvt++;
/* Keep a private copy so we can reissue requests when recovering. */ /* Keep a private copy so we can reissue requests when recovering. */
rinfo->shadow[id].req = *ring_req; 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. */ /* Fill out a communications ring structure. */
ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt); id = blkif_ring_get_request(rinfo, req, &ring_req);
id = get_id_from_freelist(rinfo);
rinfo->shadow[id].request = req;
BUG_ON(info->max_indirect_segments == 0 && BUG_ON(info->max_indirect_segments == 0 &&
GREFS(req->nr_phys_segments) > BLKIF_MAX_SEGMENTS_PER_REQUEST); 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) for_each_sg(rinfo->shadow[id].sg, sg, num_sg, i)
num_grant += gnttab_count_grant(sg->offset, sg->length); num_grant += gnttab_count_grant(sg->offset, sg->length);
ring_req->u.rw.id = id;
rinfo->shadow[id].num_sg = num_sg; rinfo->shadow[id].num_sg = num_sg;
if (num_grant > BLKIF_MAX_SEGMENTS_PER_REQUEST) { 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) if (setup.segments)
kunmap_atomic(setup.segments); kunmap_atomic(setup.segments);
rinfo->ring.req_prod_pvt++;
/* Keep a private copy so we can reissue requests when recovering. */ /* Keep a private copy so we can reissue requests when recovering. */
rinfo->shadow[id].req = *ring_req; rinfo->shadow[id].req = *ring_req;