fuse/nodefs: remove FileSystem type.

To update, change

   nodefs.MountFileSystem(dir, fs, opts)

to

   nodefs.MountRoot(dir, fs.Root(), opts)

fuse/nodefs/api.go

@@ -11,18 +11,6 @@ import (
 	"github.com/hanwen/go-fuse/fuse"
 )
 
-// This is a legacy type.
-type FileSystem interface {
-	// Root should return the inode for root of this file system.
-	Root() Node
-
-	// Used for debug outputs
-	String() string
-
-	// If called, provide debug output through the log package.
-	SetDebug(debug bool)
-}
-
 // The Node interface implements the user-defined file system
 // functionality
 type Node interface {

fuse/nodefs/fuse.go

@@ -13,8 +13,3 @@ func MountRoot(mountpoint string, root Node, opts *Options) (*fuse.Server, *File
 	}
 	return s, conn, nil
 }
-
-// Mounts a filesystem on the given directory
-func MountFileSystem(mountpoint string, fs FileSystem, opts *Options) (*fuse.Server, *FileSystemConnector, error) {
-	return MountRoot(mountpoint, fs.Root(), opts)
-}