pn_getextattr
pfs_getextattr_t pn_getextattr;
KASSERT(pn->pn_getextattr != NULL, ("%s(): no callback", __func__));
return ((pn->pn_getextattr)(PFS_GETEXTATTR_ARGNAMES));
if (pn->pn_getextattr == NULL)
error = pn_getextattr(curthread, proc, pn,