tn_rdev
dev_t tn_rdev; /*int32_t ?*/
#define tn_rdev tn_spec.tn_rdev
nnode->tn_rdev = rdev;
vap->va_rmajor = umajor(node->tn_rdev);
vap->va_rminor = uminor(node->tn_rdev);
vap->va_rmajor = umajor(node->tn_rdev);
vap->va_rminor = uminor(node->tn_rdev);
fsp->rdev = ino.tn_spec.tn_rdev;