@@ -78,15 +78,16 @@ type TarStreamer interface {

 	// TarStream returns a tar archive stream

 	// for the contents of a layer.

 	TarStream() (io.ReadCloser, error)

-	// TarStreamFrom returns a tar archive stream for all the layer chain with

-	// arbitrary depth.

-	TarStreamFrom(ChainID) (io.ReadCloser, error)

 }

 // Layer represents a read-only layer

 type Layer interface {

 	TarStreamer

+	// TarStreamFrom returns a tar archive stream for all the layer chain with

+	// arbitrary depth.

+	TarStreamFrom(ChainID) (io.ReadCloser, error)

+

 	// ChainID returns the content hash of the entire layer chain. The hash

 	// chain is made up of DiffID of top layer and all of its parents.

 	ChainID() ChainID

@@ -1,7 +1,6 @@

 package layer

 import (

-	"fmt"

 	"io"

 	"github.com/docker/docker/pkg/archive"

@@ -32,13 +31,6 @@ func (ml *mountedLayer) TarStream() (io.ReadCloser, error) {

 	return ml.layerStore.driver.Diff(ml.mountID, ml.cacheParent())

 }

-func (ml *mountedLayer) TarStreamFrom(parent ChainID) (io.ReadCloser, error) {

-	// Not supported since this will include the init layer as well

-	// This can already be acheived with mount + tar.

-	// Should probably never reach this point, but error out here.

-	return nil, fmt.Errorf("getting a layer diff from an arbitrary parent is not supported on mounted layer")

-}

-

 func (ml *mountedLayer) Name() string {

 	return ml.name

 }