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| author | Julien Grall <julien.grall@citrix.com> | 2015-08-13 20:23:10 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2016-01-04 18:21:24 +0100 |
| commit | 2e073969d57f60fc0b863985779657624cbd4886 (patch) | |
| tree | 49964e6c600fcab04fa359b7a9ee238e8363b253 /drivers/block/xen-blkfront.c | |
| parent | xen-blkback: clear PF_NOFREEZE for xen_blkif_schedule() (diff) | |
| download | linux-2e073969d57f60fc0b863985779657624cbd4886.tar.xz linux-2e073969d57f60fc0b863985779657624cbd4886.zip | |
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: 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>
Diffstat (limited to 'drivers/block/xen-blkfront.c')
| -rw-r--r-- | drivers/block/xen-blkfront.c | 30 |
1 files changed, 19 insertions, 11 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index ef5ce43e307a..0b32c90ffc3f 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -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; |