NFS: Fix NFS mountpoint crossing...

The check that was added to nfs_xdev_get_sb() to work around broken
servers, works fine for NFSv2, but causes mountpoint crossing on NFSv3 to
always return ESTALE.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 2426e71..ea92920 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1475,7 +1475,7 @@
 		error = PTR_ERR(mntroot);
 		goto error_splat_super;
 	}
-	if (mntroot->d_inode->i_op != &nfs_dir_inode_operations) {
+	if (mntroot->d_inode->i_op != server->nfs_client->rpc_ops->dir_inode_ops) {
 		dput(mntroot);
 		error = -ESTALE;
 		goto error_splat_super;