diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index f0188ea..bfad746 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -175,14 +175,16 @@
 };
 
 enum {
-	Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
+	Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
 
 	Opt_xprt_err
 };
 
 static const match_table_t nfs_xprt_protocol_tokens = {
 	{ Opt_xprt_udp, "udp" },
+	{ Opt_xprt_udp6, "udp6" },
 	{ Opt_xprt_tcp, "tcp" },
+	{ Opt_xprt_tcp6, "tcp6" },
 	{ Opt_xprt_rdma, "rdma" },
 
 	{ Opt_xprt_err, NULL }
@@ -492,6 +494,45 @@
 	return sec_flavours[i].str;
 }
 
+static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
+				  int showdefaults)
+{
+	struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
+
+	seq_printf(m, ",mountproto=");
+	switch (sap->sa_family) {
+	case AF_INET:
+		switch (nfss->mountd_protocol) {
+		case IPPROTO_UDP:
+			seq_printf(m, RPCBIND_NETID_UDP);
+			break;
+		case IPPROTO_TCP:
+			seq_printf(m, RPCBIND_NETID_TCP);
+			break;
+		default:
+			if (showdefaults)
+				seq_printf(m, "auto");
+		}
+		break;
+	case AF_INET6:
+		switch (nfss->mountd_protocol) {
+		case IPPROTO_UDP:
+			seq_printf(m, RPCBIND_NETID_UDP6);
+			break;
+		case IPPROTO_TCP:
+			seq_printf(m, RPCBIND_NETID_TCP6);
+			break;
+		default:
+			if (showdefaults)
+				seq_printf(m, "auto");
+		}
+		break;
+	default:
+		if (showdefaults)
+			seq_printf(m, "auto");
+	}
+}
+
 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
 				    int showdefaults)
 {
@@ -518,17 +559,7 @@
 	if (nfss->mountd_port || showdefaults)
 		seq_printf(m, ",mountport=%u", nfss->mountd_port);
 
-	switch (nfss->mountd_protocol) {
-	case IPPROTO_UDP:
-		seq_printf(m, ",mountproto=udp");
-		break;
-	case IPPROTO_TCP:
-		seq_printf(m, ",mountproto=tcp");
-		break;
-	default:
-		if (showdefaults)
-			seq_printf(m, ",mountproto=auto");
-	}
+	nfs_show_mountd_netid(m, nfss, showdefaults);
 }
 
 /*
@@ -578,7 +609,7 @@
 			seq_puts(m, nfs_infop->nostr);
 	}
 	seq_printf(m, ",proto=%s",
-		   rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
+		   rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
 	if (version == 4) {
 		if (nfss->port != NFS_PORT)
 			seq_printf(m, ",port=%u", nfss->port);
@@ -883,6 +914,8 @@
 {
 	char *p, *string, *secdata;
 	int rc, sloppy = 0, invalid_option = 0;
+	unsigned short protofamily = AF_UNSPEC;
+	unsigned short mountfamily = AF_UNSPEC;
 
 	if (!raw) {
 		dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
@@ -1228,12 +1261,17 @@
 			token = match_token(string,
 					    nfs_xprt_protocol_tokens, args);
 
+			protofamily = AF_INET;
 			switch (token) {
+			case Opt_xprt_udp6:
+				protofamily = AF_INET6;
 			case Opt_xprt_udp:
 				mnt->flags &= ~NFS_MOUNT_TCP;
 				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 				kfree(string);
 				break;
+			case Opt_xprt_tcp6:
+				protofamily = AF_INET6;
 			case Opt_xprt_tcp:
 				mnt->flags |= NFS_MOUNT_TCP;
 				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
@@ -1261,10 +1299,15 @@
 					    nfs_xprt_protocol_tokens, args);
 			kfree(string);
 
+			mountfamily = AF_INET;
 			switch (token) {
+			case Opt_xprt_udp6:
+				mountfamily = AF_INET6;
 			case Opt_xprt_udp:
 				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
 				break;
+			case Opt_xprt_tcp6:
+				mountfamily = AF_INET6;
 			case Opt_xprt_tcp:
 				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
 				break;
@@ -1363,8 +1406,33 @@
 	if (!sloppy && invalid_option)
 		return 0;
 
+	/*
+	 * verify that any proto=/mountproto= options match the address
+	 * familiies in the addr=/mountaddr= options.
+	 */
+	if (protofamily != AF_UNSPEC &&
+	    protofamily != mnt->nfs_server.address.ss_family)
+		goto out_proto_mismatch;
+
+	if (mountfamily != AF_UNSPEC) {
+		if (mnt->mount_server.addrlen) {
+			if (mountfamily != mnt->mount_server.address.ss_family)
+				goto out_mountproto_mismatch;
+		} else {
+			if (mountfamily != mnt->nfs_server.address.ss_family)
+				goto out_mountproto_mismatch;
+		}
+	}
+
 	return 1;
 
+out_mountproto_mismatch:
+	printk(KERN_INFO "NFS: mount server address does not match mountproto= "
+			 "option\n");
+	return 0;
+out_proto_mismatch:
+	printk(KERN_INFO "NFS: server address does not match proto= option\n");
+	return 0;
 out_invalid_address:
 	printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
 	return 0;