DMZ_SEQ_WRITE_ERR
clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags);
clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags);
set_bit(DMZ_SEQ_WRITE_ERR, &zone->flags);
#define dmz_seq_write_err(z) test_bit(DMZ_SEQ_WRITE_ERR, &(z)->flags)