NFS: Remove support for the 'nfsprog' option

Remove the mount option that allows users to specify an alternate NFS
program number.  The client hasn't support setting an alternate NFS
program number for a very long time.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/internal.h

@@ -43,7 +43,6 @@ struct nfs_parsed_mount_data {
 	struct {
 		struct sockaddr_in	address;
 		char			*hostname;
-		unsigned int		program;
 		unsigned int		version;
 		unsigned short		port;
 		int			protocol;

fs/nfs/super.c

@@ -84,7 +84,7 @@ enum {
 	Opt_namelen,
 	Opt_mountport,
 	Opt_mountprog, Opt_mountvers,
-	Opt_nfsprog, Opt_nfsvers,
+	Opt_nfsvers,
 
 	/* Mount options that take string arguments */
 	Opt_sec, Opt_proto, Opt_mountproto,
@@ -139,7 +139,6 @@ static match_table_t nfs_mount_option_tokens = {
 	{ Opt_mountport, "mountport=%u" },
 	{ Opt_mountprog, "mountprog=%u" },
 	{ Opt_mountvers, "mountvers=%u" },
-	{ Opt_nfsprog, "nfsprog=%u" },
 	{ Opt_nfsvers, "nfsvers=%u" },
 	{ Opt_nfsvers, "vers=%u" },
 
@@ -801,13 +800,6 @@ static int nfs_parse_mount_options(char *raw,
 				return 0;
 			mnt->mount_server.version = option;
 			break;
-		case Opt_nfsprog:
-			if (match_int(args, &option))
-				return 0;
-			if (option < 0)
-				return 0;
-			mnt->nfs_server.program = option;
-			break;
 		case Opt_nfsvers:
 			if (match_int(args, &option))
 				return 0;
@@ -1067,9 +1059,6 @@ static int nfs_try_mount(struct nfs_parsed_mount_data *args,
  *
  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
  *   mountproto=tcp after mountproto=udp, and so on
- *
- * XXX: as far as I can tell, changing the NFS program number is not
- *      supported in the NFS client.
  */
 static int nfs_validate_mount_data(void *options,
 				   struct nfs_parsed_mount_data *args,
@@ -1095,7 +1084,6 @@ static int nfs_validate_mount_data(void *options,
 	args->mount_server.protocol = XPRT_TRANSPORT_UDP;
 	args->mount_server.program = NFS_MNT_PROGRAM;
 	args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
-	args->nfs_server.program = NFS_PROGRAM;
 
 	switch (data->version) {
 	case 1: