kdump.sh: send fence kdump message to other nodes in the cluster

In 2nd kernel, to prevent the crashed system from being fenced off,
fence kdump message must be send to other nodes in the cluster
periodically before dumping process.

We preserve every node's name in /etc/fence_kdump_nodes in the
initrd, so we parse this file and send notify them.

Signed-off-by: WANG Chao <chaowang@redhat.com>
Tested-by: Zhi Zou <zzou@redhat.com>
Tested-by: Marek Grac <mgrac@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>

dracut-kdump.sh

@@ -287,6 +287,21 @@ read_kdump_conf()
     done < $conf_file
 }
 
+fence_kdump_notify()
+{
+    local nodes
+
+    if [ -f $FENCE_KDUMP_NODES ]; then
+        if [ -f $FENCE_KDUMP_CONFIG ]; then
+            . $FENCE_KDUMP_CONFIG
+        fi
+
+        read nodes < $FENCE_KDUMP_NODES
+        $FENCE_KDUMP_SEND $FENCE_KDUMP_OPTS $nodes &
+    fi
+}
+
+fence_kdump_notify
 read_kdump_conf
 
 if [ -z "$CORE_COLLECTOR" ];then