NFS: Save the values of the "mount*=" mount options

Save the value of the mountproto= mountport= mountvers= and mountaddr=
options so that these values can be displayed later via
nfs_show_options().

This preserves the intent of the original mount options, should the file
system need to be remounted based on what's displayed in /proc/mounts.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 670e5c7..ac7e4fb 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -118,6 +118,13 @@
 
 	atomic_t active; /* Keep trace of any activity to this server */
 	wait_queue_head_t active_wq;  /* Wait for any activity to stop  */
+
+	/* mountd-related mount options */
+	struct sockaddr_storage	mountd_address;
+	size_t			mountd_addrlen;
+	u32			mountd_version;
+	unsigned short		mountd_port;
+	unsigned short		mountd_protocol;
 };
 
 /* Server capabilities */