@@ -92,7 +92,7 @@ func (daemon *Daemon) populateCommand(c *container.Container, env []string) erro

 		}

 	}

-	m, err := layer.RWLayerMetadata(daemon.layerStore, c.ID)

+	m, err := daemon.layerStore.Metadata(c.ID)

 	if err != nil {

 		return derr.ErrorCodeGetLayerMetadata.WithArgs(err)

 	}

@@ -10,7 +10,6 @@ import (

 	"github.com/docker/docker/container"

 	"github.com/docker/docker/daemon/exec"

 	"github.com/docker/docker/daemon/network"

-	"github.com/docker/docker/layer"

 	"github.com/docker/docker/pkg/version"

 )

@@ -164,17 +163,7 @@ func (daemon *Daemon) getInspectData(container *container.Container, size bool)

 	contJSONBase.GraphDriver.Name = container.Driver

-	image, err := daemon.imageStore.Get(container.ImageID)

-	if err != nil {

-		return nil, err

-	}

-	l, err := daemon.layerStore.Get(image.RootFS.ChainID())

-	if err != nil {

-		return nil, err

-	}

-	defer layer.ReleaseAndLog(daemon.layerStore, l)

-

-	graphDriverData, err := l.Metadata()

+	graphDriverData, err := daemon.layerStore.Metadata(container.ID)

 	if err != nil {

 		return nil, err

 	}

@@ -132,6 +132,10 @@ func (ls *mockLayerStore) Changes(id string) ([]archive.Change, error) {

 	return nil, errors.New("not implemented")

 }

+func (ls *mockLayerStore) Metadata(id string) (map[string]string, error) {

+	return nil, errors.New("not implemented")

+}

+

 type mockDownloadDescriptor struct {

 	currentDownloads *int32

 	id               string

@@ -209,9 +209,14 @@ func (s *DockerSuite) TestInspectContainerGraphDriver(c *check.C) {

 		return

 	}

+	imageDeviceID, err := inspectField("busybox", "GraphDriver.Data.DeviceId")

+	c.Assert(err, checker.IsNil)

+

 	deviceID, err := inspectField(out, "GraphDriver.Data.DeviceId")

 	c.Assert(err, checker.IsNil)

+	c.Assert(imageDeviceID, checker.Not(checker.Equals), deviceID)

+

 	_, err = strconv.Atoi(deviceID)

 	c.Assert(err, checker.IsNil, check.Commentf("failed to inspect DeviceId of the image: %s, %v", deviceID, err))

@@ -151,6 +151,7 @@ type Store interface {

 	Unmount(id string) error

 	DeleteMount(id string) ([]Metadata, error)

 	Changes(id string) ([]archive.Change, error)

+	Metadata(id string) (map[string]string, error)

 }

 // MetadataTransaction represents functions for setting layer metadata

@@ -621,6 +621,17 @@ func (ls *layerStore) assembleTar(graphID string, metadata io.ReadCloser, size *

 	return pR, nil

 }

+// Metadata returns the low level metadata from the mount with the given name

+func (ls *layerStore) Metadata(name string) (map[string]string, error) {

+	ls.mountL.Lock()

+	m := ls.mounts[name]

+	ls.mountL.Unlock()

+	if m == nil {

+		return nil, ErrMountDoesNotExist

+	}

+	return ls.driver.GetMetadata(m.mountID)

+}

+

 type naiveDiffPathDriver struct {

 	graphdriver.Driver

 }

@@ -34,24 +34,6 @@ func GetLayerPath(s Store, layer ChainID) (string, error) {

 	return path, nil

 }

-// RWLayerMetadata returns the graph metadata for the provided

-// mount name.

-func RWLayerMetadata(s Store, name string) (map[string]string, error) {

-	ls, ok := s.(*layerStore)

-	if !ok {

-		return nil, errors.New("unsupported layer store")

-	}

-	ls.mountL.Lock()

-	defer ls.mountL.Unlock()

-

-	ml, ok := ls.mounts[name]

-	if !ok {

-		return nil, errors.New("mount does not exist")

-	}

-

-	return ls.driver.GetMetadata(ml.mountID)

-}

-

 func (ls *layerStore) RegisterDiffID(graphID string, size int64) (Layer, error) {

 	var err error // this is used for cleanup in existingLayer case

 	diffID, err := digest.FromBytes([]byte(graphID))