ext2_find_next_zero_bit
next_zero_bit = ext2_find_next_zero_bit(bh->b_data,
next = ext2_find_next_zero_bit(bh->b_data, maxblocks, start);
here = ext2_find_next_zero_bit(bh->b_data, end_goal, start);
ino = ext2_find_next_zero_bit((unsigned long *)bitmap_bh->b_data,