nfs_sillyrename
nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp, true)) {
nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp, bool dolink)