CAST_DOWN
dp = (struct dirent *) CAST_DOWN(caddr_t, uio_iov_base(uiop));
dp = (struct dirent *) CAST_DOWN(caddr_t, uio_iov_base(uiop));
dp = (struct dirent *) CAST_DOWN(caddr_t, uio_iov_base(uiop));
cp = CAST_DOWN(caddr_t, uio_iov_base(uiop));
dp = (struct dirent *) CAST_DOWN(caddr_t, uio_iov_base(uiop));