refactor volume binder

pkg/controller/volume/scheduling/scheduler_binder.go

@@ -131,6 +131,9 @@ type SchedulerVolumeBinder interface {
 
 	// GetBindingsCache returns the cache used (if any) to store volume binding decisions.
 	GetBindingsCache() PodBindingCache
+
+	// DeletePodBindings will delete pod's bindingDecisions in podBindingCache.
+	DeletePodBindings(pod *v1.Pod)
 }
 
 type volumeBinder struct {
@@ -181,6 +184,14 @@ func (b *volumeBinder) GetBindingsCache() PodBindingCache {
 	return b.podBindingCache
 }
 
+// DeletePodBindings will delete pod's bindingDecisions in podBindingCache.
+func (b *volumeBinder) DeletePodBindings(pod *v1.Pod) {
+	cache := b.podBindingCache
+	if pod != nil {
+		cache.DeleteBindings(pod)
+	}
+}
+
 // FindPodVolumes caches the matching PVs and PVCs to provision per node in podBindingCache.
 // This method intentionally takes in a *v1.Node object instead of using volumebinder.nodeInformer.
 // That's necessary because some operations will need to pass in to the predicate fake node objects.

pkg/controller/volume/scheduling/scheduler_binder_fake.go

@@ -63,3 +63,6 @@ func (b *FakeVolumeBinder) BindPodVolumes(assumedPod *v1.Pod) error {
 func (b *FakeVolumeBinder) GetBindingsCache() PodBindingCache {
 	return nil
 }
+
+// DeletePodBindings implements SchedulerVolumeBinder.DeletePodBindings.
+func (b *FakeVolumeBinder) DeletePodBindings(pod *v1.Pod) {}