to0based
const __le16 lpp0b = to0based(bdev_physical_block_size(bdev) /
id->npwg = to0based(bdev_io_min(bdev) / bdev_logical_block_size(bdev));
id->npdg = to0based(bdev_discard_granularity(bdev) /
id->nows = to0based(bdev_io_opt(bdev) / bdev_logical_block_size(bdev));