Il 17/02/2013 07:37, Asias He ha scritto:

quoted

quoted

 static int __virtblk_add_req(struct virtqueue *vq,
-			     struct virtblk_req *vbr)
+			     struct virtblk_req *vbr,
+			     struct scatterlist *data_sg,
+			     unsigned data_nents)
 {
 	struct scatterlist sg;
 	enum dma_data_direction dir;
 	int ret;
 
+	int type = vbr->out_hdr.type & ~VIRTIO_BLK_T_OUT;
 	unsigned int nents = 2;
 	unsigned int nsg = 2;
 
-	if (vbr->nents) {
+	if (type == VIRTIO_BLK_T_SCSI_CMD) {
+		BUG_ON(use_bio);

Do we really need the BUG_ON?  Even if with use_bio=1,
VIRTIO_BLK_T_SCSI_CMD cmd can be fired. See this:

I stand corrected... will send the patch with this removed.

Paolo