bio_integrity_intervals
meta->seed += bio_integrity_intervals(bi, bio_sectors(bio));
bip->bip_iter.bi_sector += bio_integrity_intervals(bi, bytes_done >> 9);
bip->bip_iter.bi_sector -= bio_integrity_intervals(bi, bytes_done >> 9);
return bio_integrity_intervals(bi, sectors) * bi->metadata_size;