vsd_set
(void) vsd_set(vp, nfs4_srv_vkey, NULL);
VERIFY(vsd_set(vp, nfs4_srv_vkey, (void *)fp) == 0);
(void) vsd_set(vp, nfs4_srv_vkey, NULL);
(void) vsd_set(vp, nfs4_srv_vkey, NULL);
int vsd_set(vnode_t *, uint_t, void *);