File disconnect-invalid-two-primaries.patch of Package drbd.24674
diff -Naur drbd-9.0.11+git.1e2bccdc.orig/drbd/drbd_receiver.c drbd-9.0.11+git.1e2bccdc/drbd/drbd_receiver.c
--- drbd-9.0.11+git.1e2bccdc.orig/drbd/drbd_receiver.c 2021-04-06 14:41:06.413848069 +0800
+++ drbd-9.0.11+git.1e2bccdc/drbd/drbd_receiver.c 2021-04-06 14:59:22.906599677 +0800
@@ -3870,7 +3870,8 @@
struct drbd_connection *connection = peer_device->connection;
enum drbd_disk_state disk_state;
struct net_conf *nc;
- int hg, rule_nr, rr_conflict, always_asbp, peer_node_id = 0, r;
+ int hg, rule_nr, rr_conflict, always_asbp, peer_node_id = 0, r, pcount;
+ bool two_primaries;
hg = drbd_handshake(peer_device, &rule_nr, &peer_node_id, true);
@@ -3901,11 +3902,18 @@
nc = rcu_dereference(connection->transport.net_conf);
always_asbp = nc->always_asbp;
rr_conflict = nc->rr_conflict;
+ two_primaries = nc ? nc->two_primaries : false;
rcu_read_unlock();
+ pcount = (device->resource->role[NOW] == R_PRIMARY)
+ + (peer_role == R_PRIMARY);
+
+ if (hg == 0 && pcount == 2 && !two_primaries) {
+ drbd_alert(device, "Dual primaries detected with unified UUID but not allowed, drop connection!\n");
+ return -1;
+ }
+
if (hg == 100 || (hg == -100 && always_asbp)) {
- int pcount = (device->resource->role[NOW] == R_PRIMARY)
- + (peer_role == R_PRIMARY);
int forced = (hg == -100);
switch (pcount) {