Remove driver wide mount label for dm

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Upstream-commit: 8b450a93b8bb3b1cd0c32754dd499ec0c9b66537
Component: engine

components/engine/runtime/graphdriver/devmapper/driver.go

@@ -22,8 +22,7 @@ func init() {
 
 type Driver struct {
 	*DeviceSet
-	home       string
-	MountLabel string
+	home string
 }
 
 var Init = func(home string) (graphdriver.Driver, error) {
@@ -62,12 +61,11 @@ func (d *Driver) Cleanup() error {
 }
 
 func (d *Driver) Create(id, parent string, mountLabel string) error {
-	d.MountLabel = mountLabel
 	if err := d.DeviceSet.AddDevice(id, parent); err != nil {
 		return err
 	}
 	mp := path.Join(d.home, "mnt", id)
-	if err := d.mount(id, mp, d.MountLabel); err != nil {
+	if err := d.mount(id, mp); err != nil {
 		return err
 	}
 
@@ -117,7 +115,7 @@ func (d *Driver) Remove(id string) error {
 
 func (d *Driver) Get(id string) (string, error) {
 	mp := path.Join(d.home, "mnt", id)
-	if err := d.mount(id, mp, d.MountLabel); err != nil {
+	if err := d.mount(id, mp); err != nil {
 		return "", err
 	}
 
@@ -130,13 +128,13 @@ func (d *Driver) Put(id string) {
 	}
 }
 
-func (d *Driver) mount(id, mountPoint string, mountLabel string) error {
+func (d *Driver) mount(id, mountPoint string) error {
 	// Create the target directories if they don't exist
 	if err := osMkdirAll(mountPoint, 0755); err != nil && !osIsExist(err) {
 		return err
 	}
 	// Mount the device
-	return d.DeviceSet.MountDevice(id, mountPoint, mountLabel)
+	return d.DeviceSet.MountDevice(id, mountPoint, "")
 }
 
 func (d *Driver) Exists(id string) bool {