md-cluster: update document for raid10

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>

Documentation/md/md-cluster.txt

-The cluster MD is a shared-device RAID for a cluster.
+The cluster MD is a shared-device RAID for a cluster, it supports
+two levels: raid1 and raid10 (limited support).
 
 
 1. On-disk format

drivers/md/Kconfig

@@ -178,7 +178,7 @@ config MD_FAULTY
 
 
 config MD_CLUSTER
-	tristate "Cluster Support for MD (EXPERIMENTAL)"
+	tristate "Cluster Support for MD"
 	depends on BLK_DEV_MD
 	depends on DLM
 	default n
@@ -188,7 +188,8 @@ config MD_CLUSTER
 	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.
+	nodes of the cluster. Currently, it can work with raid1 and raid10
+	(limited support).
 
 	If unsure, say N.
 

drivers/md/md-cluster.c

@@ -1478,7 +1478,7 @@ static struct md_cluster_operations cluster_ops = {
 
 static int __init cluster_init(void)
 {
-	pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");
+	pr_warn("md-cluster: support raid1 and raid10 (limited support)\n");
 	pr_info("Registering Cluster MD functions\n");
 	register_md_cluster_operations(&cluster_ops, THIS_MODULE);
 	return 0;