mtdswap_eb_offset
offset = mtdswap_eb_offset(d, eb);
offset = mtdswap_eb_offset(d, eb);
offset = mtdswap_eb_offset(d, eb);
offset = mtdswap_eb_offset(d, eb) + d->mtd->writesize;
erase.addr = mtdswap_eb_offset(d, eb);
base = mtdswap_eb_offset(d, eb);