ent_lba
mapping = ent_lba(mapping);
postmap = ent_lba(raw_mapping);
arena->freelist[lane].block = ent_lba(le32_to_cpu(ent->old_map));
log_oldmap = ent_lba(le32_to_cpu(log_new.old_map));
log_newmap = ent_lba(le32_to_cpu(log_new.new_map));