ufs_dtogd
bit = ufs_dtogd(uspi, fragment);
fragno = ufs_dtogd(uspi, fragment);
goal = ufs_dtogd(uspi, result);
goal = ufs_dtogd(uspi, goal);
start = ufs_dtogd(uspi, goal) >> 3;
bit = ufs_dtogd(uspi, fragment);