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