vio9p_req_alloc_impl
if ((vnr = vio9p_req_alloc_impl(vin, KM_NOSLEEP_LAZY)) != NULL) {
if ((vnr = vio9p_req_alloc_impl(vin, KM_SLEEP)) == NULL) {
static vio9p_req_t *vio9p_req_alloc_impl(vio9p_t *, int);