mb_find_next_bit
i = mb_find_next_bit(bitmap, max, i);
j = mb_find_next_bit(bitmap,
next = mb_find_next_bit(bitmap_bh->b_data, end, bit);
next = mb_find_next_bit(bitmap, last + 1, start);
next = mb_find_next_bit(bitmap, end + 1, start);
return mb_find_next_bit(addr, max, start);