mmc_sector_mod
rem = mmc_sector_mod(from_new, card->erase_size);
if (mmc_sector_mod(from, card->erase_size) || nr % card->erase_size)
rem = card->erase_size - mmc_sector_mod(from, card->erase_size);
if (mmc_sector_mod(from, card->erase_size) || nr % card->erase_size)