calc_block_sector
calc_block_sector(from, &block0, &block1, &page, &ofs,
calc_block_sector(from, &block0, &block1, &page, &ofs, docg3->reliable);
calc_block_sector(info->addr + info->len, &block0, &block1, &page,
calc_block_sector(info->addr, &block0, &block1, &page, &ofs,
calc_block_sector(to, &block0, &block1, &page, &ofs, docg3->reliable);
calc_block_sector(from - skip, &block0, &block1, &page, &ofs,