pn_close
pfs_close_t pn_close;
KASSERT(pn->pn_close != NULL, ("%s(): no callback", __func__));
return ((pn->pn_close)(PFS_CLOSE_ARGNAMES));
if (vrefcnt(vn) > 1 || pn->pn_close == NULL)
error = pn_close(va->a_td, proc, pn);