VRING_DESC_F_INDIRECT
if ((vdir->flags & VRING_DESC_F_INDIRECT) == 0) {
if (vp->flags & VRING_DESC_F_INDIRECT) {
if (vp.vd_flags & VRING_DESC_F_INDIRECT) {
if ((vdir.vd_flags & VRING_DESC_F_INDIRECT) == 0) {