@@ -153,8 +153,19 @@ func (d *Driver) Status() [][2]string {

 	}

 }

+// panicIfUsedByLcow does exactly what it says.

+// TODO @jhowardmsft - this is an temporary measure for the bring-up of

+// Linux containers on Windows. It is a failsafe to ensure that the right

+// graphdriver is used.

+func panicIfUsedByLcow() {

+	if system.LCOWSupported() {

+		panic("inconsistency - windowsfilter graphdriver should not be used when in LCOW mode")

+	}

+}

+

 // Exists returns true if the given id is registered with this driver.

 func (d *Driver) Exists(id string) bool {

+	panicIfUsedByLcow()

 	rID, err := d.resolveID(id)

 	if err != nil {

 		return false

@@ -169,6 +180,7 @@ func (d *Driver) Exists(id string) bool {

 // CreateReadWrite creates a layer that is writable for use as a container

 // file system.

 func (d *Driver) CreateReadWrite(id, parent string, opts *graphdriver.CreateOpts) error {

+	panicIfUsedByLcow()

 	if opts != nil {

 		return d.create(id, parent, opts.MountLabel, false, opts.StorageOpt)

 	}

@@ -177,6 +189,7 @@ func (d *Driver) CreateReadWrite(id, parent string, opts *graphdriver.CreateOpts

 // Create creates a new read-only layer with the given id.

 func (d *Driver) Create(id, parent string, opts *graphdriver.CreateOpts) error {

+	panicIfUsedByLcow()

 	if opts != nil {

 		return d.create(id, parent, opts.MountLabel, true, opts.StorageOpt)

 	}

@@ -260,6 +273,7 @@ func (d *Driver) dir(id string) string {

 // Remove unmounts and removes the dir information.

 func (d *Driver) Remove(id string) error {

+	panicIfUsedByLcow()

 	rID, err := d.resolveID(id)

 	if err != nil {

 		return err

@@ -341,6 +355,7 @@ func (d *Driver) Remove(id string) error {

 // Get returns the rootfs path for the id. This will mount the dir at its given path.

 func (d *Driver) Get(id, mountLabel string) (string, error) {

+	panicIfUsedByLcow()

 	logrus.Debugf("WindowsGraphDriver Get() id %s mountLabel %s", id, mountLabel)

 	var dir string

@@ -399,6 +414,7 @@ func (d *Driver) Get(id, mountLabel string) (string, error) {

 // Put adds a new layer to the driver.

 func (d *Driver) Put(id string) error {

+	panicIfUsedByLcow()

 	logrus.Debugf("WindowsGraphDriver Put() id %s", id)

 	rID, err := d.resolveID(id)

@@ -428,7 +444,6 @@ func (d *Driver) Put(id string) error {

 // We use this opportunity to cleanup any -removing folders which may be

 // still left if the daemon was killed while it was removing a layer.

 func (d *Driver) Cleanup() error {

-

 	items, err := ioutil.ReadDir(d.info.HomeDir)

 	if err != nil {

 		if os.IsNotExist(err) {

@@ -458,6 +473,7 @@ func (d *Driver) Cleanup() error {

 // layer and its parent layer which may be "".

 // The layer should be mounted when calling this function

 func (d *Driver) Diff(id, parent string) (_ io.ReadCloser, err error) {

+	panicIfUsedByLcow()

 	rID, err := d.resolveID(id)

 	if err != nil {

 		return

@@ -494,6 +510,7 @@ func (d *Driver) Diff(id, parent string) (_ io.ReadCloser, err error) {

 // and its parent layer. If parent is "", then all changes will be ADD changes.

 // The layer should not be mounted when calling this function.

 func (d *Driver) Changes(id, parent string) ([]archive.Change, error) {

+	panicIfUsedByLcow()

 	rID, err := d.resolveID(id)

 	if err != nil {

 		return nil, err

@@ -549,6 +566,7 @@ func (d *Driver) Changes(id, parent string) ([]archive.Change, error) {

 // new layer in bytes.

 // The layer should not be mounted when calling this function

 func (d *Driver) ApplyDiff(id, parent string, diff io.Reader) (int64, error) {

+	panicIfUsedByLcow()

 	var layerChain []string

 	if parent != "" {

 		rPId, err := d.resolveID(parent)

@@ -583,6 +601,7 @@ func (d *Driver) ApplyDiff(id, parent string, diff io.Reader) (int64, error) {

 // and its parent and returns the size in bytes of the changes

 // relative to its base filesystem directory.

 func (d *Driver) DiffSize(id, parent string) (size int64, err error) {

+	panicIfUsedByLcow()

 	rPId, err := d.resolveID(parent)

 	if err != nil {

 		return

@@ -604,6 +623,7 @@ func (d *Driver) DiffSize(id, parent string) (size int64, err error) {

 // GetMetadata returns custom driver information.

 func (d *Driver) GetMetadata(id string) (map[string]string, error) {

+	panicIfUsedByLcow()

 	m := make(map[string]string)

 	m["dir"] = d.dir(id)

 	return m, nil

@@ -906,6 +926,7 @@ func (fg *fileGetCloserWithBackupPrivileges) Close() error {

 // DiffGetter returns a FileGetCloser that can read files from the directory that

 // contains files for the layer differences. Used for direct access for tar-split.

 func (d *Driver) DiffGetter(id string) (graphdriver.FileGetCloser, error) {

+	panicIfUsedByLcow()

 	id, err := d.resolveID(id)

 	if err != nil {

 		return nil, err