NFS: Add version registering framework

This patch adds in the code to track multiple versions of the NFS
protocol.  I created default structures for v2, v3 and v4 so that each
version can continue to work while I convert them into kernel modules.
I also removed the const parameter from the rpc_version array so that I
can change it at runtime.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/fs/nfs/nfs2super.c b/fs/nfs/nfs2super.c
new file mode 100644
index 000000000000..cef06d42334a
--- /dev/null
+++ b/fs/nfs/nfs2super.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2012 Netapp, Inc. All rights reserved.
+ */
+#include <linux/module.h>
+#include <linux/nfs_fs.h>
+#include "internal.h"
+#include "nfs.h"
+
+static struct nfs_subversion nfs_v2 = {
+        .owner = THIS_MODULE,
+        .nfs_fs   = &nfs_fs_type,
+        .rpc_vers = &nfs_version2,
+        .rpc_ops  = &nfs_v2_clientops,
+};
+
+int __init init_nfs_v2(void)
+{
+        register_nfs_version(&nfs_v2);
+        return 0;
+}
+
+void exit_nfs_v2(void)
+{
+        unregister_nfs_version(&nfs_v2);
+}