block: split scsi_request out of struct request
And require all drivers that want to support BLOCK_PC to allocate it
as the first thing of their private data. To support this the legacy
IDE and BSG code is switched to set cmd_size on their queues to let
the block layer allocate the additional space.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 10332c2..3027d2e 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -52,6 +52,7 @@ 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;
@@ -91,7 +92,7 @@ static int __virtblk_add_req(struct virtqueue *vq,
* inhdr with additional status information.
*/
if (type == cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_SCSI_CMD)) {
- sg_init_one(&cmd, vbr->req->cmd, vbr->req->cmd_len);
+ sg_init_one(&cmd, vbr->sreq.cmd, vbr->sreq.cmd_len);
sgs[num_out++] = &cmd;
}
@@ -103,7 +104,6 @@ static int __virtblk_add_req(struct virtqueue *vq,
}
if (type == cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_SCSI_CMD)) {
- memcpy(vbr->sense, vbr->req->sense, SCSI_SENSE_BUFFERSIZE);
sg_init_one(&sense, vbr->sense, SCSI_SENSE_BUFFERSIZE);
sgs[num_out + num_in++] = &sense;
sg_init_one(&inhdr, &vbr->in_hdr, sizeof(vbr->in_hdr));
@@ -123,8 +123,10 @@ static inline void virtblk_request_done(struct request *req)
int error = virtblk_result(vbr);
if (req->cmd_type == REQ_TYPE_BLOCK_PC) {
- req->resid_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.residual);
- req->sense_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.sense_len);
+ scsi_req(req)->resid_len =
+ virtio32_to_cpu(vblk->vdev, vbr->in_hdr.residual);
+ vbr->sreq.sense_len =
+ virtio32_to_cpu(vblk->vdev, vbr->in_hdr.sense_len);
req->errors = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.errors);
} else if (req->cmd_type == REQ_TYPE_DRV_PRIV) {
req->errors = (error != 0);
@@ -538,6 +540,7 @@ static int virtblk_init_request(void *data, struct request *rq,
struct virtio_blk *vblk = data;
struct virtblk_req *vbr = blk_mq_rq_to_pdu(rq);
+ vbr->sreq.sense = vbr->sense;
sg_init_table(vbr->sg, vblk->sg_elems);
return 0;
}