From 94de8b27d0dcb2608d56a7e5c2941b87e6da7ce3 Mon Sep 17 00:00:00 2001
From: Andy Adamson <andros@netapp.com>
Date: Tue, 1 Mar 2011 01:34:12 +0000
Subject: NFSv4.1: add MDS mount DS only check

The DS only role cannot be used to mount.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---
 fs/nfs/client.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'fs/nfs/client.c')

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 280d41f64a57..d5c5bdfa4231 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -1453,6 +1453,10 @@ static int nfs4_server_common_setup(struct nfs_server *server,
 	BUG_ON(!server->nfs_client->rpc_ops);
 	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
 
+	/* data servers support only a subset of NFSv4.1 */
+	if (is_ds_only_client(server->nfs_client))
+		return -EPROTONOSUPPORT;
+
 	fattr = nfs_alloc_fattr();
 	if (fattr == NULL)
 		return -ENOMEM;
-- 
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