is_sequential
is_sequential(ump, ip->i_db[bn - 1], ip->i_db[bn]);
is_sequential(ump, ip->i_db[bn],
is_sequential(ump,
is_sequential(ump,
is_sequential(ump, ip->i_db[bn - 1], ip->i_db[bn]);
is_sequential(ump, ip->i_db[bn],
is_sequential(ump,
is_sequential(ump, ((daddr_t *)bp->b_data)[bn],