empty_dir: Check if hugetlbfs volume is mounted with a correct pagesize

Extended GetMountMedium function to check if hugetlbfs volume
is mounted with the page size equal to the medium size.

Page size is obtained from the 'pagesize' mount option of the
mounted hugetlbfs volume.

pkg/volume/emptydir/empty_dir_unsupported.go

@@ -19,6 +19,7 @@ limitations under the License.
 package emptydir
 
 import (
+	"k8s.io/apimachinery/pkg/api/resource"
 	"k8s.io/utils/mount"
 
 	v1 "k8s.io/api/core/v1"
@@ -29,6 +30,6 @@ type realMountDetector struct {
 	mounter mount.Interface
 }
 
-func (m *realMountDetector) GetMountMedium(path string) (v1.StorageMedium, bool, error) {
-	return v1.StorageMediumDefault, false, nil
+func (m *realMountDetector) GetMountMedium(path string, requestedMedium v1.StorageMedium) (v1.StorageMedium, bool, *resource.Quantity, error) {
+	return v1.StorageMediumDefault, false, nil, nil
 }