static int blk_get_request(struct XenBlkDev *blkdev, struct ioreq *ioreq, RING_IDX rc) { switch (blkdev->protocol) { case BLKIF_PROTOCOL_NATIVE: memcpy(&ioreq->req, RING_GET_REQUEST(&blkdev->rings.native, rc), sizeof(ioreq->req)); break; case BLKIF_PROTOCOL_X86_32: blkif_get_x86_32_req(&ioreq->req, RING_GET_REQUEST(&blkdev->rings.x86_32_part, rc)); break; case BLKIF_PROTOCOL_X86_64: blkif_get_x86_64_req(&ioreq->req, RING_GET_REQUEST(&blkdev->rings.x86_64_part, rc)); break; } return 0; }