ext4_find_next_zero_bit
next_zero_bit = ext4_find_next_zero_bit(bh->b_data, bitmap_size, offset);
next_zero_bit = ext4_find_next_zero_bit(bh->b_data,
*ino = ext4_find_next_zero_bit((unsigned long *)
ret = ext4_find_next_zero_bit(addr, tmpmax, start) - fix;