has_invariant
if (has_invariant(ntb, DRBD_A_DISK_CONF_BACKING_DEV) ||
has_invariant(ntb, DRBD_A_DISK_CONF_META_DEV) ||
has_invariant(ntb, DRBD_A_DISK_CONF_META_DEV_IDX) ||
has_invariant(ntb, DRBD_A_DISK_CONF_DISK_SIZE) ||
has_invariant(ntb, DRBD_A_DISK_CONF_MAX_BIO_BVECS)) {
if (has_invariant(ntb, DRBD_A_NET_CONF_DISCARD_MY_DATA) ||
has_invariant(ntb, DRBD_A_NET_CONF_TENTATIVE)) {