STZCVMUNSAFE
so->so_proto_props.sopp_zcopyflag &= ~STZCVMUNSAFE;
so->so_proto_props.sopp_zcopyflag |= STZCVMUNSAFE;
if ((copyflag & (STZCVMSAFE|STZCVMUNSAFE)) == 0) {
stp->sd_copyflag &= ~STZCVMUNSAFE;
stp->sd_copyflag |= STZCVMUNSAFE;
copyflag & STZCVMUNSAFE) {