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virtio_blk: remove struct request backpointer from virtblk_req
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We can simply use blk_mq_rq_from_pdu to get back at the request at
I/O completion time.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Christoph Hellwig authored and Jens Axboe committed Jan 31, 2017
1 parent 72148ae commit 85dada0
Showing 1 changed file with 10 additions and 10 deletions.
20 changes: 10 additions & 10 deletions drivers/block/virtio_blk.c
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Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,6 @@ struct virtio_blk {

struct virtblk_req {
struct scsi_request sreq; /* for SCSI passthrough */
struct request *req;
struct virtio_blk_outhdr out_hdr;
struct virtio_scsi_inhdr in_hdr;
u8 status;
Expand Down Expand Up @@ -148,7 +147,9 @@ static void virtblk_done(struct virtqueue *vq)
do {
virtqueue_disable_cb(vq);
while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) {
blk_mq_complete_request(vbr->req, vbr->req->errors);
struct request *req = blk_mq_rq_from_pdu(vbr);

blk_mq_complete_request(req, req->errors);
req_done = true;
}
if (unlikely(virtqueue_is_broken(vq)))
Expand All @@ -175,27 +176,26 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx,

BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);

vbr->req = req;
if (req_op(req) == REQ_OP_FLUSH) {
vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_FLUSH);
vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(req));
} else {
switch (req->cmd_type) {
case REQ_TYPE_FS:
vbr->out_hdr.type = 0;
vbr->out_hdr.sector = cpu_to_virtio64(vblk->vdev, blk_rq_pos(vbr->req));
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
vbr->out_hdr.sector = cpu_to_virtio64(vblk->vdev, blk_rq_pos(req));
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(req));
break;
case REQ_TYPE_BLOCK_PC:
vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_SCSI_CMD);
vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(req));
break;
case REQ_TYPE_DRV_PRIV:
vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID);
vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(req));
break;
default:
/* We don't put anything else in the queue. */
Expand All @@ -205,9 +205,9 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx,

blk_mq_start_request(req);

num = blk_rq_map_sg(hctx->queue, vbr->req, vbr->sg);
num = blk_rq_map_sg(hctx->queue, req, vbr->sg);
if (num) {
if (rq_data_dir(vbr->req) == WRITE)
if (rq_data_dir(req) == WRITE)
vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_OUT);
else
vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_IN);
Expand Down

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