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 63e05e32b46269e29f8e75e03073d5587fd6d916..eed1fec2d97bc78af6794f8544e101adbf227ad0 100644 (file)
--- 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 a2da532b1c2bda38d18a6324c2dfdcfcc7108df5..7ed86876f3b7faa6e51b62b5f104d60aad3c480b 100644 (file)
--- 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 (file)
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");