From 8e854e9cfd1cc3837b4bd96643d5174a72d9f741 Mon Sep 17 00:00:00 2001
From: Goldwyn Rodrigues <rgoldwyn@suse.com>
Date: Fri, 7 Mar 2014 11:21:15 -0600
Subject: Create a separate module for clustering support

Tagged as EXPERIMENTAL for now.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>

diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 63e05e3..eed1fec 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -175,6 +175,22 @@ config MD_FAULTY
 
 	  In unsure, say N.
 
+
+config MD_CLUSTER
+	tristate "Cluster Support for MD (EXPERIMENTAL)"
+	depends on BLK_DEV_MD
+	depends on DLM
+	default n
+	---help---
+	Clustering support for MD devices. This enables locking and
+	synchronization across multiple systems on the cluster, so all
+	nodes in the cluster can access the MD devices simultaneously.
+
+	This brings the redundancy (and uptime) of RAID levels across the
+	nodes of the cluster.
+
+	If unsure, say N.
+
 source "drivers/md/bcache/Kconfig"
 
 config BLK_DEV_DM_BUILTIN
diff --git a/drivers/md/Makefile b/drivers/md/Makefile
index a2da532..7ed8687 100644
--- a/drivers/md/Makefile
+++ b/drivers/md/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_MD_RAID10)		+= raid10.o
 obj-$(CONFIG_MD_RAID456)	+= raid456.o
 obj-$(CONFIG_MD_MULTIPATH)	+= multipath.o
 obj-$(CONFIG_MD_FAULTY)		+= faulty.o
+obj-$(CONFIG_MD_CLUSTER)	+= md-cluster.o
 obj-$(CONFIG_BCACHE)		+= bcache/
 obj-$(CONFIG_BLK_DEV_MD)	+= md-mod.o
 obj-$(CONFIG_BLK_DEV_DM)	+= dm-mod.o
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
new file mode 100644
index 0000000..f377e71
--- /dev/null
+++ b/drivers/md/md-cluster.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2015, SUSE
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ */
+
+
+#include <linux/module.h>
+
+static int __init cluster_init(void)
+{
+	pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");
+	pr_info("Registering Cluster MD functions\n");
+	return 0;
+}
+
+static void cluster_exit(void)
+{
+}
+
+module_init(cluster_init);
+module_exit(cluster_exit);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Clustering support for MD");
-- 
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