DMZ_BLOCK_SHIFT
max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT);
unsigned int size = nr_blocks << DMZ_BLOCK_SHIFT;
#define DMZ_BLOCK_SIZE (1 << DMZ_BLOCK_SHIFT)
#define DMZ_BLOCK_SHIFT_BITS (DMZ_BLOCK_SHIFT + 3)
#define DMZ_BLOCK_SECTORS_SHIFT (DMZ_BLOCK_SHIFT - SECTOR_SHIFT)