dmz_zone_nr_sectors
unsigned int zone_nr_sectors = dmz_zone_nr_sectors(dmz->metadata);
chunk_sector = sector & (dmz_zone_nr_sectors(zmd) - 1);
if (chunk_sector + nr_sectors > dmz_zone_nr_sectors(zmd))
dm_accept_partial_bio(bio, dmz_zone_nr_sectors(zmd) - chunk_sector);
ti->max_io_len = dmz_zone_nr_sectors(dmz->metadata);
unsigned int chunk_sectors = dmz_zone_nr_sectors(dmz->metadata);
unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd);