File disconnect-invalid-two-primaries.patch of Package drbd.19047

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File disconnect-invalid-two-primaries.patch of Package drbd.19047

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) {

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File disconnect-invalid-two-primaries.patch of Package drbd.19047

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