dmz_zone_nr_blocks
end_block = dmz_zone_nr_blocks(zmd);
dmz_invalidate_blocks(zmd, bzone, 0, dmz_zone_nr_blocks(zmd));
dmz_invalidate_blocks(zmd, dzone, 0, dmz_zone_nr_blocks(zmd));
dmz_invalidate_blocks(zmd, dzone, 0, dmz_zone_nr_blocks(zmd));
unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd);
#define dmz_chunk_block(zmd, b) ((b) & (dmz_zone_nr_blocks(zmd) - 1))