generic ephemeral volume: graduation to GA

The feature gate gets locked to "true", with the goal to remove it in two
releases.

All code now can assume that the feature is enabled. Tests for "feature
disabled" are no longer needed and get removed.

Some code wasn't using the new helper functions yet. That gets changed while
touching those lines.

api/openapi-spec/swagger.json

@@ -9716,7 +9716,7 @@
         },
         "ephemeral": {
           "$ref": "#/definitions/io.k8s.api.core.v1.EphemeralVolumeSource",
-          "description": "Ephemeral represents a volume that is handled by a cluster storage driver. The volume's lifecycle is tied to the pod that defines it - it will be created before the pod starts, and deleted when the pod is removed.\n\nUse this if: a) the volume is only needed while the pod runs, b) features of normal volumes like restoring from snapshot or capacity\n   tracking are needed,\nc) the storage driver is specified through a storage class, and d) the storage driver supports dynamic volume provisioning through\n   a PersistentVolumeClaim (see EphemeralVolumeSource for more\n   information on the connection between this volume type\n   and PersistentVolumeClaim).\n\nUse PersistentVolumeClaim or one of the vendor-specific APIs for volumes that persist for longer than the lifecycle of an individual pod.\n\nUse CSI for light-weight local ephemeral volumes if the CSI driver is meant to be used that way - see the documentation of the driver for more information.\n\nA pod can use both types of ephemeral volumes and persistent volumes at the same time.\n\nThis is a beta feature and only available when the GenericEphemeralVolume feature gate is enabled."
+          "description": "Ephemeral represents a volume that is handled by a cluster storage driver. The volume's lifecycle is tied to the pod that defines it - it will be created before the pod starts, and deleted when the pod is removed.\n\nUse this if: a) the volume is only needed while the pod runs, b) features of normal volumes like restoring from snapshot or capacity\n   tracking are needed,\nc) the storage driver is specified through a storage class, and d) the storage driver supports dynamic volume provisioning through\n   a PersistentVolumeClaim (see EphemeralVolumeSource for more\n   information on the connection between this volume type\n   and PersistentVolumeClaim).\n\nUse PersistentVolumeClaim or one of the vendor-specific APIs for volumes that persist for longer than the lifecycle of an individual pod.\n\nUse CSI for light-weight local ephemeral volumes if the CSI driver is meant to be used that way - see the documentation of the driver for more information.\n\nA pod can use both types of ephemeral volumes and persistent volumes at the same time."
         },
         "fc": {
           "$ref": "#/definitions/io.k8s.api.core.v1.FCVolumeSource",

cmd/kube-controller-manager/app/core.go

@@ -368,7 +368,6 @@ func startVolumeExpandController(ctx context.Context, controllerContext Controll
 }
 
 func startEphemeralVolumeController(ctx context.Context, controllerContext ControllerContext) (controller.Interface, bool, error) {
-	if utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume) {
 	ephemeralController, err := ephemeral.NewController(
 		controllerContext.ClientBuilder.ClientOrDie("ephemeral-volume-controller"),
 		controllerContext.InformerFactory.Core().V1().Pods(),
@@ -378,8 +377,6 @@ func startEphemeralVolumeController(ctx context.Context, controllerContext Contr
 	}
 	go ephemeralController.Run(int(controllerContext.ComponentConfig.EphemeralVolumeController.ConcurrentEphemeralVolumeSyncs), ctx.Done())
 	return nil, true, nil
-	}
-	return nil, false, nil
 }
 
 func startEndpointController(ctx context.Context, controllerCtx ControllerContext) (controller.Interface, bool, error) {
@@ -554,7 +551,6 @@ func startPVCProtectionController(ctx context.Context, controllerContext Control
 		controllerContext.InformerFactory.Core().V1().Pods(),
 		controllerContext.ClientBuilder.ClientOrDie("pvc-protection-controller"),
 		utilfeature.DefaultFeatureGate.Enabled(features.StorageObjectInUseProtection),
-		utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume),
 	)
 	if err != nil {
 		return nil, true, fmt.Errorf("failed to start the pvc protection controller: %v", err)

pkg/api/pod/util.go

@@ -556,7 +556,6 @@ func dropDisabledFields(
 	dropDisabledProcMountField(podSpec, oldPodSpec)
 
 	dropDisabledCSIVolumeSourceAlphaFields(podSpec, oldPodSpec)
-	dropDisabledEphemeralVolumeSourceAlphaFields(podSpec, oldPodSpec)
 
 	if !utilfeature.DefaultFeatureGate.Enabled(features.NonPreemptingPriority) &&
 		!podPriorityInUse(oldPodSpec) {
@@ -605,16 +604,6 @@ func dropDisabledCSIVolumeSourceAlphaFields(podSpec, oldPodSpec *api.PodSpec) {
 	}
 }
 
-// dropDisabledEphemeralVolumeSourceAlphaFields removes disabled alpha fields from []EphemeralVolumeSource.
-// This should be called from PrepareForCreate/PrepareForUpdate for all pod specs resources containing a EphemeralVolumeSource
-func dropDisabledEphemeralVolumeSourceAlphaFields(podSpec, oldPodSpec *api.PodSpec) {
-	if !utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume) && !ephemeralInUse(oldPodSpec) {
-		for i := range podSpec.Volumes {
-			podSpec.Volumes[i].Ephemeral = nil
-		}
-	}
-}
-
 func dropPodAffinityTermNamespaceSelector(terms []api.PodAffinityTerm) {
 	for i := range terms {
 		terms[i].NamespaceSelector = nil
@@ -795,19 +784,6 @@ func csiInUse(podSpec *api.PodSpec) bool {
 	return false
 }
 
-// ephemeralInUse returns true if any pod's spec include inline CSI volumes.
-func ephemeralInUse(podSpec *api.PodSpec) bool {
-	if podSpec == nil {
-		return false
-	}
-	for i := range podSpec.Volumes {
-		if podSpec.Volumes[i].Ephemeral != nil {
-			return true
-		}
-	}
-	return false
-}
-
 // SeccompAnnotationForField takes a pod seccomp profile field and returns the
 // converted annotation value
 func SeccompAnnotationForField(field *api.SeccompProfile) string {

pkg/apis/core/types.go

@@ -182,9 +182,6 @@ type VolumeSource struct {
 	// A pod can use both types of ephemeral volumes and
 	// persistent volumes at the same time.
 	//
-	// This is a beta feature and only available when the GenericEphemeralVolume
-	// feature gate is enabled.
-	//
 	// +optional
 	Ephemeral *EphemeralVolumeSource
 }

pkg/apis/policy/validation/validation.go

@@ -22,7 +22,7 @@ import (
 	"regexp"
 	"strings"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	policyapiv1beta1 "k8s.io/api/policy/v1beta1"
 	apimachineryvalidation "k8s.io/apimachinery/pkg/api/validation"
 	unversionedvalidation "k8s.io/apimachinery/pkg/apis/meta/v1/validation"
@@ -94,9 +94,6 @@ var ValidatePodSecurityPolicyName = apimachineryvalidation.NameIsDNSSubdomain
 
 // PodSecurityPolicyValidationOptions contains additional parameters for ValidatePodSecurityPolicy.
 type PodSecurityPolicyValidationOptions struct {
-	// AllowEphemeralVolumeType determines whether Ephemeral is a valid entry
-	// in PodSecurityPolicySpec.Volumes.
-	AllowEphemeralVolumeType bool
 }
 
 // ValidatePodSecurityPolicy validates a PodSecurityPolicy and returns an ErrorList
@@ -332,10 +329,6 @@ func validatePodSecurityPolicyVolumes(opts PodSecurityPolicyValidationOptions, f
 	allowed := psputil.GetAllFSTypesAsSet()
 	// add in the * value since that is a pseudo type that is not included by default
 	allowed.Insert(string(policy.All))
-	// Ephemeral may or may not be allowed.
-	if !opts.AllowEphemeralVolumeType {
-		allowed.Delete(string(policy.Ephemeral))
-	}
 	for _, v := range volumes {
 		if !allowed.Has(string(v)) {
 			allErrs = append(allErrs, field.NotSupported(fldPath.Child("volumes"), v, allowed.List()))

pkg/apis/policy/validation/validation_test.go

@@ -22,7 +22,7 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	policyv1beta1 "k8s.io/api/policy/v1beta1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
@@ -786,7 +786,7 @@ func TestValidatePSPVolumes(t *testing.T) {
 	for _, strVolume := range volumes.List() {
 		psp := validPSP()
 		psp.Spec.Volumes = []policy.FSType{policy.FSType(strVolume)}
-		errs := ValidatePodSecurityPolicy(psp, PodSecurityPolicyValidationOptions{AllowEphemeralVolumeType: true})
+		errs := ValidatePodSecurityPolicy(psp, PodSecurityPolicyValidationOptions{})
 		if len(errs) != 0 {
 			t.Errorf("%s validation expected no errors but received %v", strVolume, errs)
 		}
@@ -1118,7 +1118,6 @@ func TestAllowEphemeralVolumeType(t *testing.T) {
 		},
 	}
 
-	for _, allowed := range []bool{true, false} {
 	for _, oldPSPInfo := range pspInfo {
 		for _, newPSPInfo := range pspInfo {
 			oldPSP := oldPSPInfo.psp()
@@ -1127,25 +1126,18 @@ func TestAllowEphemeralVolumeType(t *testing.T) {
 				continue
 			}
 
-				t.Run(fmt.Sprintf("feature enabled=%v, old PodSecurityPolicySpec %v, new PodSecurityPolicySpec %v", allowed, oldPSPInfo.description, newPSPInfo.description), func(t *testing.T) {
+			t.Run(fmt.Sprintf("old PodSecurityPolicySpec %v, new PodSecurityPolicySpec %v", oldPSPInfo.description, newPSPInfo.description), func(t *testing.T) {
-					opts := PodSecurityPolicyValidationOptions{
+				opts := PodSecurityPolicyValidationOptions{}
-						AllowEphemeralVolumeType: allowed,
-					}
 				var errs field.ErrorList
-					expectErrors := newPSPInfo.hasGenericVolume && !allowed
 				if oldPSP == nil {
 					errs = ValidatePodSecurityPolicy(newPSP, opts)
 				} else {
 					errs = ValidatePodSecurityPolicyUpdate(oldPSP, newPSP, opts)
 				}
-					if expectErrors && len(errs) == 0 {
+				if len(errs) > 0 {
-						t.Error("expected errors, got none")
-					}
-					if !expectErrors && len(errs) > 0 {
 					t.Errorf("expected no errors, got: %v", errs)
 				}
 			})
 		}
 	}
-	}
 }

pkg/controller/volume/attachdetach/util/util.go

@@ -47,10 +47,9 @@ func CreateVolumeSpec(podVolume v1.Volume, pod *v1.Pod, nodeName types.NodeName,
 		claimName = pvcSource.ClaimName
 		readOnly = pvcSource.ReadOnly
 	}
-	isEphemeral := false
+	isEphemeral := podVolume.VolumeSource.Ephemeral != nil
-	if ephemeralSource := podVolume.VolumeSource.Ephemeral; ephemeralSource != nil && utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume) {
+	if isEphemeral {
 		claimName = ephemeral.VolumeClaimName(pod, &podVolume)
-		isEphemeral = true
 	}
 	if claimName != "" {
 		klog.V(10).Infof(

pkg/controller/volume/common/common.go

@@ -20,9 +20,8 @@ import (
 	"fmt"
 
 	v1 "k8s.io/api/core/v1"
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/client-go/tools/cache"
-	"k8s.io/kubernetes/pkg/features"
+	"k8s.io/component-helpers/storage/ephemeral"
 )
 
 const (
@@ -31,9 +30,9 @@ const (
 )
 
 // PodPVCIndexFunc creates an index function that returns PVC keys (=
-// namespace/name) for given pod.  If enabled, this includes the PVCs
+// namespace/name) for given pod.  This includes the PVCs
 // that might be created for generic ephemeral volumes.
-func PodPVCIndexFunc(genericEphemeralVolumeFeatureEnabled bool) func(obj interface{}) ([]string, error) {
+func PodPVCIndexFunc() func(obj interface{}) ([]string, error) {
 	return func(obj interface{}) ([]string, error) {
 		pod, ok := obj.(*v1.Pod)
 		if !ok {
@@ -44,9 +43,8 @@ func PodPVCIndexFunc(genericEphemeralVolumeFeatureEnabled bool) func(obj interfa
 			claimName := ""
 			if pvcSource := podVolume.VolumeSource.PersistentVolumeClaim; pvcSource != nil {
 				claimName = pvcSource.ClaimName
-			}
+			} else if podVolume.VolumeSource.Ephemeral != nil {
-			if ephemeralSource := podVolume.VolumeSource.Ephemeral; genericEphemeralVolumeFeatureEnabled && ephemeralSource != nil {
+				claimName = ephemeral.VolumeClaimName(pod, &podVolume)
-				claimName = pod.Name + "-" + podVolume.Name
 			}
 			if claimName != "" {
 				keys = append(keys, fmt.Sprintf("%s/%s", pod.Namespace, claimName))
@@ -56,10 +54,9 @@ func PodPVCIndexFunc(genericEphemeralVolumeFeatureEnabled bool) func(obj interfa
 	}
 }
 
-// AddPodPVCIndexerIfNotPresent adds the PodPVCIndexFunc with the current global setting for GenericEphemeralVolume.
+// AddPodPVCIndexerIfNotPresent adds the PodPVCIndexFunc.
 func AddPodPVCIndexerIfNotPresent(indexer cache.Indexer) error {
-	return AddIndexerIfNotPresent(indexer, PodPVCIndex,
+	return AddIndexerIfNotPresent(indexer, PodPVCIndex, PodPVCIndexFunc())
-		PodPVCIndexFunc(utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume)))
 }
 
 // AddIndexerIfNotPresent adds the index function with the name into the cache indexer if not present

pkg/controller/volume/pvcprotection/pvc_protection_controller.go

@@ -56,18 +56,14 @@ type Controller struct {
 
 	// allows overriding of StorageObjectInUseProtection feature Enabled/Disabled for testing
 	storageObjectInUseProtectionEnabled bool
-
-	// allows overriding of GenericEphemeralVolume feature Enabled/Disabled for testing
-	genericEphemeralVolumeFeatureEnabled bool
 }
 
 // NewPVCProtectionController returns a new instance of PVCProtectionController.
-func NewPVCProtectionController(pvcInformer coreinformers.PersistentVolumeClaimInformer, podInformer coreinformers.PodInformer, cl clientset.Interface, storageObjectInUseProtectionFeatureEnabled, genericEphemeralVolumeFeatureEnabled bool) (*Controller, error) {
+func NewPVCProtectionController(pvcInformer coreinformers.PersistentVolumeClaimInformer, podInformer coreinformers.PodInformer, cl clientset.Interface, storageObjectInUseProtectionFeatureEnabled bool) (*Controller, error) {
 	e := &Controller{
 		client:                              cl,
 		queue:                               workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "pvcprotection"),
 		storageObjectInUseProtectionEnabled: storageObjectInUseProtectionFeatureEnabled,
-		genericEphemeralVolumeFeatureEnabled: genericEphemeralVolumeFeatureEnabled,
 	}
 	if cl != nil && cl.CoreV1().RESTClient().GetRateLimiter() != nil {
 		ratelimiter.RegisterMetricAndTrackRateLimiterUsage("persistentvolumeclaim_protection_controller", cl.CoreV1().RESTClient().GetRateLimiter())
@@ -85,7 +81,7 @@ func NewPVCProtectionController(pvcInformer coreinformers.PersistentVolumeClaimI
 	e.podLister = podInformer.Lister()
 	e.podListerSynced = podInformer.Informer().HasSynced
 	e.podIndexer = podInformer.Informer().GetIndexer()
-	if err := common.AddIndexerIfNotPresent(e.podIndexer, common.PodPVCIndex, common.PodPVCIndexFunc(genericEphemeralVolumeFeatureEnabled)); err != nil {
+	if err := common.AddIndexerIfNotPresent(e.podIndexer, common.PodPVCIndex, common.PodPVCIndexFunc()); err != nil {
 		return nil, fmt.Errorf("could not initialize pvc protection controller: %w", err)
 	}
 	podInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
@@ -252,23 +248,12 @@ func (c *Controller) askInformer(pvc *v1.PersistentVolumeClaim) (bool, error) {
 			continue
 		}
 
-		if c.genericEphemeralVolumeFeatureEnabled {
 		// We still need to look at each volume: that's redundant for volume.PersistentVolumeClaim,
 		// but for volume.Ephemeral we need to be sure that this particular PVC is the one
 		// created for the ephemeral volume.
 		if c.podUsesPVC(pod, pvc) {
 			return true, nil
 		}
-			continue
-
-		}
-
-		// This is the traditional behavior without GenericEphemeralVolume enabled.
-		if pod.Spec.NodeName == "" {
-			continue
-		}
-		// found a pod using this PVC
-		return true, nil
 	}
 
 	klog.V(4).InfoS("No Pod using PVC was found in the Informer's cache", "PVC", klog.KObj(pvc))
@@ -300,7 +285,7 @@ func (c *Controller) podUsesPVC(pod *v1.Pod, pvc *v1.PersistentVolumeClaim) bool
 	if pod.Spec.NodeName != "" {
 		for _, volume := range pod.Spec.Volumes {
 			if volume.PersistentVolumeClaim != nil && volume.PersistentVolumeClaim.ClaimName == pvc.Name ||
-				c.genericEphemeralVolumeFeatureEnabled && !podIsShutDown(pod) && volume.Ephemeral != nil && ephemeral.VolumeClaimName(pod, &volume) == pvc.Name && ephemeral.VolumeIsForPod(pod, pvc) == nil {
+				!podIsShutDown(pod) && volume.Ephemeral != nil && ephemeral.VolumeClaimName(pod, &volume) == pvc.Name && ephemeral.VolumeIsForPod(pod, pvc) == nil {
 				klog.V(2).InfoS("Pod uses PVC", "pod", klog.KObj(pod), "PVC", klog.KObj(pvc))
 				return true
 			}
@@ -407,7 +392,7 @@ func (c *Controller) enqueuePVCs(pod *v1.Pod, deleted bool) {
 		switch {
 		case volume.PersistentVolumeClaim != nil:
 			c.queue.Add(pod.Namespace + "/" + volume.PersistentVolumeClaim.ClaimName)
-		case c.genericEphemeralVolumeFeatureEnabled && volume.Ephemeral != nil:
+		case volume.Ephemeral != nil:
 			c.queue.Add(pod.Namespace + "/" + ephemeral.VolumeClaimName(pod, &volume))
 		}
 	}

pkg/controller/volume/pvcprotection/pvc_protection_controller_test.go

@@ -146,7 +146,7 @@ func generateUpdateErrorFunc(t *testing.T, failures int) clienttesting.ReactionF
 	}
 }
 
-func testPVCProtectionController(t *testing.T, genericEphemeralVolumeFeatureEnabled bool) {
+func TestPVCProtectionController(t *testing.T) {
 	pvcGVR := schema.GroupVersionResource{
 		Group:    v1.GroupName,
 		Version:  "v1",
@@ -430,7 +430,7 @@ func testPVCProtectionController(t *testing.T, genericEphemeralVolumeFeatureEnab
 		podInformer := informers.Core().V1().Pods()
 
 		// Create the controller
-		ctrl, err := NewPVCProtectionController(pvcInformer, podInformer, client, test.storageObjectInUseProtectionEnabled, genericEphemeralVolumeFeatureEnabled)
+		ctrl, err := NewPVCProtectionController(pvcInformer, podInformer, client, test.storageObjectInUseProtectionEnabled)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -518,8 +518,3 @@ func testPVCProtectionController(t *testing.T, genericEphemeralVolumeFeatureEnab
 
 	}
 }
-
-func TestPVCProtectionController(t *testing.T) {
-	t.Run("with-GenericEphemeralVolume", func(t *testing.T) { testPVCProtectionController(t, true) })
-	t.Run("without-GenericEphemeralVolume", func(t *testing.T) { testPVCProtectionController(t, false) })
-}

pkg/features/kube_features.go

@@ -162,6 +162,7 @@ const (
 	// owner: @pohly
 	// alpha: v1.19
 	// beta: v1.21
+	// GA: v1.23
 	//
 	// Enables generic ephemeral inline volume support for pods
 	GenericEphemeralVolume featuregate.Feature = "GenericEphemeralVolume"
@@ -802,7 +803,7 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
 	CSIInlineVolume:                                {Default: true, PreRelease: featuregate.Beta},
 	CSIStorageCapacity:                             {Default: true, PreRelease: featuregate.Beta},
 	CSIServiceAccountToken:                         {Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.23
-	GenericEphemeralVolume:                         {Default: true, PreRelease: featuregate.Beta},
+	GenericEphemeralVolume:                         {Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.25
 	CSIVolumeFSGroupPolicy:                         {Default: true, PreRelease: featuregate.Beta},
 	RuntimeClass:                                   {Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.23
 	NetworkPolicyEndPort:                           {Default: true, PreRelease: featuregate.Beta},

pkg/kubelet/kubelet_pods.go

@@ -2038,9 +2038,6 @@ func (kl *Kubelet) hasHostMountPVC(pod *v1.Pod) bool {
 		case volume.PersistentVolumeClaim != nil:
 			pvcName = volume.PersistentVolumeClaim.ClaimName
 		case volume.Ephemeral != nil:
-			if !utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume) {
-				continue
-			}
 			pvcName = ephemeral.VolumeClaimName(pod, &volume)
 		default:
 			continue

pkg/kubelet/kubelet_pods_test.go

@@ -38,10 +38,8 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/diff"
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	core "k8s.io/client-go/testing"
 	"k8s.io/client-go/tools/record"
-	featuregatetesting "k8s.io/component-base/featuregate/testing"
 	netutils "k8s.io/utils/net"
 
 	// TODO: remove this import if
@@ -49,7 +47,6 @@ import (
 	// to "v1"?
 
 	_ "k8s.io/kubernetes/pkg/apis/core/install"
-	"k8s.io/kubernetes/pkg/features"
 	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
 	containertest "k8s.io/kubernetes/pkg/kubelet/container/testing"
 	"k8s.io/kubernetes/pkg/kubelet/cri/streaming/portforward"
@@ -2985,7 +2982,6 @@ func TestHasHostMountPVC(t *testing.T) {
 		podHasPVC       bool
 		pvcIsHostPath   bool
 		podHasEphemeral bool
-		ephemeralEnabled bool
 	}
 	tests := map[string]testcase{
 		"no pvc": {podHasPVC: false, expected: false},
@@ -3007,15 +3003,8 @@ func TestHasHostMountPVC(t *testing.T) {
 		"enabled ephemeral host path": {
 			podHasEphemeral: true,
 			pvcIsHostPath:   true,
-			ephemeralEnabled: true,
 			expected:        true,
 		},
-		"disabled ephemeral host path": {
-			podHasEphemeral:  true,
-			pvcIsHostPath:    true,
-			ephemeralEnabled: false,
-			expected:         false,
-		},
 		"non host path pvc": {
 			podHasPVC:     true,
 			pvcIsHostPath: false,
@@ -3024,7 +3013,6 @@ func TestHasHostMountPVC(t *testing.T) {
 	}
 
 	run := func(t *testing.T, v testcase) {
-		defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, v.ephemeralEnabled)()
 		testKubelet := newTestKubelet(t, false)
 		defer testKubelet.Cleanup()
 		pod := &v1.Pod{

pkg/kubelet/server/stats/volume_stat_calculator.go

@@ -149,8 +149,7 @@ func (s *volumeStatCalculator) calcAndStoreStats() {
 				Name:      pvcSource.ClaimName,
 				Namespace: s.pod.GetNamespace(),
 			}
-		}
+		} else if volSpec.Ephemeral != nil {
-		if volSpec.Ephemeral != nil && utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume) {
 			pvcRef = &stats.PVCReference{
 				Name:      ephemeral.VolumeClaimName(s.pod, &volSpec),
 				Namespace: s.pod.GetNamespace(),

pkg/kubelet/server/stats/volume_stat_calculator_test.go

@@ -105,7 +105,6 @@ var (
 )
 
 func TestPVCRef(t *testing.T) {
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, true)()
 	mockCtrl := gomock.NewController(t)
 	defer mockCtrl.Finish()
 

pkg/kubelet/volumemanager/populator/desired_state_of_world_populator.go

@@ -36,6 +36,7 @@ import (
 	"k8s.io/apimachinery/pkg/util/wait"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/component-helpers/storage/ephemeral"
 	"k8s.io/kubernetes/pkg/features"
 	"k8s.io/kubernetes/pkg/kubelet/config"
 	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
@@ -462,28 +463,15 @@ func (dswp *desiredStateOfWorldPopulator) deleteProcessedPod(
 func (dswp *desiredStateOfWorldPopulator) createVolumeSpec(
 	podVolume v1.Volume, pod *v1.Pod, mounts, devices sets.String) (*v1.PersistentVolumeClaim, *volume.Spec, string, error) {
 	pvcSource := podVolume.VolumeSource.PersistentVolumeClaim
-	ephemeral := false
+	isEphemeral := pvcSource == nil && podVolume.VolumeSource.Ephemeral != nil
-	if pvcSource == nil &&
+	if isEphemeral {
-		podVolume.VolumeSource.Ephemeral != nil {
-		if !utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume) {
-			// Provide an unambiguous error message that
-			// explains why the volume cannot be
-			// processed. If we just ignore the volume
-			// source, the error is just a vague "unknown
-			// volume source".
-			return nil, nil, "", fmt.Errorf(
-				"volume %s is a generic ephemeral volume, but that feature is disabled in kubelet",
-				podVolume.Name,
-			)
-		}
 		// Generic ephemeral inline volumes are handled the
 		// same way as a PVC reference. The only additional
 		// constraint (checked below) is that the PVC must be
 		// owned by the pod.
 		pvcSource = &v1.PersistentVolumeClaimVolumeSource{
-			ClaimName: pod.Name + "-" + podVolume.Name,
+			ClaimName: ephemeral.VolumeClaimName(pod, &podVolume),
 		}
-		ephemeral = true
 	}
 	if pvcSource != nil {
 		klog.V(5).InfoS("Found PVC", "PVC", klog.KRef(pod.Namespace, pvcSource.ClaimName))
@@ -497,12 +485,10 @@ func (dswp *desiredStateOfWorldPopulator) createVolumeSpec(
 				pvcSource.ClaimName,
 				err)
 		}
-		if ephemeral && !metav1.IsControlledBy(pvc, pod) {
+		if isEphemeral {
-			return nil, nil, "", fmt.Errorf(
+			if err := ephemeral.VolumeIsForPod(pod, pvc); err != nil {
-				"error processing PVC %s/%s: not the ephemeral PVC for the pod",
+				return nil, nil, "", err
-				pod.Namespace,
+			}
-				pvcSource.ClaimName,
-			)
 		}
 		pvName, pvcUID := pvc.Spec.VolumeName, pvc.UID
 		klog.V(5).InfoS("Found bound PV for PVC", "PVC", klog.KRef(pod.Namespace, pvcSource.ClaimName), "PVCUID", pvcUID, "PVName", pvName)

pkg/kubelet/volumemanager/populator/desired_state_of_world_populator_test.go

@@ -546,8 +546,6 @@ func TestFindAndRemoveNonattachableVolumes(t *testing.T) {
 }
 
 func TestEphemeralVolumeOwnerCheck(t *testing.T) {
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, true)()
-
 	// create dswp
 	pod, pv, pvc := createEphemeralVolumeObjects("dswp-test-pod", "dswp-test-volume-name", false /* not owned */)
 	dswp, fakePodManager, _, _, _ := createDswpWithVolume(t, pv, pvc)
@@ -560,109 +558,14 @@ func TestEphemeralVolumeOwnerCheck(t *testing.T) {
 		t.Fatalf("%s should not have been processed by the populator", podName)
 	}
 	require.Equal(t,
-		[]string{fmt.Sprintf("error processing PVC %s/%s: not the ephemeral PVC for the pod", pvc.Namespace, pvc.Name)},
+		[]string{fmt.Sprintf("PVC %s/%s was not created for pod %s/%s (pod is not owner)",
+			pvc.Namespace, pvc.Name,
+			pod.Namespace, pod.Name,
+		)},
 		dswp.desiredStateOfWorld.PopPodErrors(podName),
 	)
 }
 
-func TestEphemeralVolumeEnablement(t *testing.T) {
-	// create dswp
-	pod, pv, pvc := createEphemeralVolumeObjects("dswp-test-pod", "dswp-test-volume-name", true /* owned */)
-	dswp, fakePodManager, fakesDSW, _, fakePodState := createDswpWithVolume(t, pv, pvc)
-	fakePodManager.AddPod(pod)
-
-	podName := util.GetUniquePodName(pod)
-	volumeName := pod.Spec.Volumes[0].Name
-	generatedVolumeName := "fake-plugin/" + volumeName
-
-	// Feature disabled -> refuse to process pod.
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, false)()
-	dswp.findAndAddNewPods()
-	if dswp.pods.processedPods[podName] {
-		t.Fatalf("%s should not have been processed by the populator", podName)
-	}
-	require.Equal(t,
-		[]string{fmt.Sprintf("volume %s is a generic ephemeral volume, but that feature is disabled in kubelet", volumeName)},
-		dswp.desiredStateOfWorld.PopPodErrors(podName),
-	)
-
-	// Enabled -> process pod.
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, true)()
-	dswp.findAndAddNewPods()
-	if !dswp.pods.processedPods[podName] {
-		t.Fatalf("Failed to record that the volumes for the specified pod: %s have been processed by the populator", podName)
-	}
-
-	expectedVolumeName := v1.UniqueVolumeName(generatedVolumeName)
-
-	volumeExists := fakesDSW.VolumeExists(expectedVolumeName)
-	if !volumeExists {
-		t.Fatalf(
-			"VolumeExists(%q) failed. Expected: <true> Actual: <%v>",
-			expectedVolumeName,
-			volumeExists)
-	}
-
-	if podExistsInVolume := fakesDSW.PodExistsInVolume(
-		podName, expectedVolumeName); !podExistsInVolume {
-		t.Fatalf(
-			"DSW PodExistsInVolume returned incorrect value. Expected: <true> Actual: <%v>",
-			podExistsInVolume)
-	}
-
-	verifyVolumeExistsInVolumesToMount(
-		t, v1.UniqueVolumeName(generatedVolumeName), false /* expectReportedInUse */, fakesDSW)
-
-	//let the pod be terminated
-	podGet, exist := fakePodManager.GetPodByName(pod.Namespace, pod.Name)
-	if !exist {
-		t.Fatalf("Failed to get pod by pod name: %s and namespace: %s", pod.Name, pod.Namespace)
-	}
-	fakePodState.removed = map[kubetypes.UID]struct{}{podGet.UID: {}}
-
-	// Pretend again that the feature is disabled.
-	// Removal of the pod and volumes is expected to work.
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, false)()
-
-	dswp.findAndRemoveDeletedPods()
-	// Although Pod status is terminated, pod still exists in pod manager and actual state does not has this pod and volume information
-	// desired state populator will fail to delete this pod and volume first
-	volumeExists = fakesDSW.VolumeExists(expectedVolumeName)
-	if !volumeExists {
-		t.Fatalf(
-			"VolumeExists(%q) failed. Expected: <true> Actual: <%v>",
-			expectedVolumeName,
-			volumeExists)
-	}
-
-	if podExistsInVolume := fakesDSW.PodExistsInVolume(
-		podName, expectedVolumeName); !podExistsInVolume {
-		t.Fatalf(
-			"DSW PodExistsInVolume returned incorrect value. Expected: <true> Actual: <%v>",
-			podExistsInVolume)
-	}
-
-	// reconcile with actual state so that volume is added into the actual state
-	// desired state populator now can successfully delete the pod and volume
-	fakeASW := dswp.actualStateOfWorld
-	reconcileASW(fakeASW, fakesDSW, t)
-	dswp.findAndRemoveDeletedPods()
-	volumeExists = fakesDSW.VolumeExists(expectedVolumeName)
-	if volumeExists {
-		t.Fatalf(
-			"VolumeExists(%q) failed. Expected: <false> Actual: <%v>",
-			expectedVolumeName,
-			volumeExists)
-	}
-
-	if podExistsInVolume := fakesDSW.PodExistsInVolume(
-		podName, expectedVolumeName); podExistsInVolume {
-		t.Fatalf(
-			"DSW PodExistsInVolume returned incorrect value. Expected: <false> Actual: <%v>",
-			podExistsInVolume)
-	}
-}
-
 func TestFindAndAddNewPods_FindAndRemoveDeletedPods_Valid_Block_VolumeDevices(t *testing.T) {
 	// create dswp
 	mode := v1.PersistentVolumeBlock

pkg/registry/core/pod/strategy_test.go

@@ -1133,100 +1133,6 @@ func TestApplySeccompVersionSkew(t *testing.T) {
 	}
 }
 
-// TestEphemeralVolumeEnablement checks the behavior of the API server
-// when the GenericEphemeralVolume feature is turned on and then off:
-// the Ephemeral struct must be preserved even during updates.
-func TestEphemeralVolumeEnablement(t *testing.T) {
-	// Enable the Feature Gate during the first pod creation
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, true)()
-
-	pod := createPodWithGenericEphemeralVolume()
-	expectedPod := pod.DeepCopy()
-
-	Strategy.PrepareForCreate(context.Background(), pod)
-	require.Equal(t, expectedPod.Spec, pod.Spec, "pod spec")
-
-	errs := Strategy.Validate(context.Background(), pod)
-	require.Empty(t, errs, "errors from validation")
-
-	// Now let's disable the Feature Gate, update some other field from the Pod and expect the volume to remain present
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, false)()
-	updatePod := testUpdatePod(t, pod, "aaa")
-
-	// And let's enable the FG again, add another from and check if the volume is still present
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, true)()
-	testUpdatePod(t, updatePod, "bbb")
-}
-
-// TestEphemeralVolumeDisabled checks the behavior of the API server
-// when the GenericEphemeralVolume is off: the Ephemeral struct gets dropped,
-// validation fails.
-func TestEphemeralVolumeDisabled(t *testing.T) {
-	// Disable the Feature Gate during the first pod creation
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, false)()
-
-	pod := createPodWithGenericEphemeralVolume()
-	expectedPod := pod.DeepCopy()
-	expectedPod.Spec.Volumes[0].VolumeSource.Ephemeral = nil
-
-	Strategy.PrepareForCreate(context.Background(), pod)
-	require.Equal(t, expectedPod.Spec, pod.Spec, "pod spec")
-
-	errs := Strategy.Validate(context.Background(), pod)
-	require.NotEmpty(t, errs, "no errors from validation")
-}
-
-func testUpdatePod(t *testing.T, oldPod *api.Pod, labelValue string) *api.Pod {
-	updatedPod := oldPod.DeepCopy()
-	updatedPod.Labels = map[string]string{"XYZ": labelValue}
-	expectedPod := updatedPod.DeepCopy()
-	Strategy.PrepareForUpdate(context.Background(), updatedPod, oldPod)
-	require.Equal(t, expectedPod.Spec, updatedPod.Spec, "updated pod spec")
-	errs := Strategy.Validate(context.Background(), updatedPod)
-	require.Empty(t, errs, "errors from validation")
-	return updatedPod
-}
-
-func createPodWithGenericEphemeralVolume() *api.Pod {
-	return &api.Pod{
-		ObjectMeta: metav1.ObjectMeta{
-			Namespace: "ns",
-			Name:      "pod",
-		},
-		Spec: api.PodSpec{
-			RestartPolicy: api.RestartPolicyAlways,
-			DNSPolicy:     api.DNSClusterFirst,
-			Containers: []api.Container{{
-				Name:                     "foo",
-				Image:                    "example",
-				TerminationMessagePolicy: api.TerminationMessageReadFile,
-				ImagePullPolicy:          api.PullAlways,
-			}},
-			Volumes: []api.Volume{
-				{
-					Name: "ephemeral",
-					VolumeSource: api.VolumeSource{
-						Ephemeral: &api.EphemeralVolumeSource{
-							VolumeClaimTemplate: &api.PersistentVolumeClaimTemplate{
-								Spec: api.PersistentVolumeClaimSpec{
-									AccessModes: []api.PersistentVolumeAccessMode{
-										api.ReadWriteOnce,
-									},
-									Resources: api.ResourceRequirements{
-										Requests: api.ResourceList{
-											api.ResourceStorage: resource.MustParse("1Gi"),
-										},
-									},
-								},
-							},
-						},
-					},
-				},
-			},
-		},
-	}
-}
-
 func newPodtWithHugePageValue(reousreceName api.ResourceName, value resource.Quantity) *api.Pod {
 	return &api.Pod{
 		ObjectMeta: metav1.ObjectMeta{

pkg/registry/policy/podsecuritypolicy/strategy.go

@@ -23,12 +23,10 @@ import (
 	"k8s.io/apimachinery/pkg/util/validation/field"
 	"k8s.io/apiserver/pkg/registry/rest"
 	"k8s.io/apiserver/pkg/storage/names"
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/kubernetes/pkg/api/legacyscheme"
 	psputil "k8s.io/kubernetes/pkg/api/podsecuritypolicy"
 	"k8s.io/kubernetes/pkg/apis/policy"
 	"k8s.io/kubernetes/pkg/apis/policy/validation"
-	"k8s.io/kubernetes/pkg/features"
 )
 
 // strategy implements behavior for PodSecurityPolicy objects
@@ -74,10 +72,7 @@ func (strategy) Canonicalize(obj runtime.Object) {
 }
 
 func (strategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorList {
-	opts := validation.PodSecurityPolicyValidationOptions{
+	opts := validation.PodSecurityPolicyValidationOptions{}
-		// Only allowed if the feature is enabled.
-		AllowEphemeralVolumeType: utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume),
-	}
 	return validation.ValidatePodSecurityPolicy(obj.(*policy.PodSecurityPolicy), opts)
 }
 
@@ -85,12 +80,7 @@ func (strategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorLis
 func (strategy) WarningsOnCreate(ctx context.Context, obj runtime.Object) []string { return nil }
 
 func (strategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
-	opts := validation.PodSecurityPolicyValidationOptions{
+	opts := validation.PodSecurityPolicyValidationOptions{}
-		// Allowed if the feature is enabled or the old policy already had it.
-		// A policy that had the type set when that was valid must remain valid.
-		AllowEphemeralVolumeType: utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume) ||
-			volumeInUse(old.(*policy.PodSecurityPolicy), policy.Ephemeral),
-	}
 	return validation.ValidatePodSecurityPolicyUpdate(old.(*policy.PodSecurityPolicy), obj.(*policy.PodSecurityPolicy), opts)
 }
 
@@ -98,15 +88,3 @@ func (strategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) fie
 func (strategy) WarningsOnUpdate(ctx context.Context, obj, old runtime.Object) []string {
 	return nil
 }
-
-func volumeInUse(oldPSP *policy.PodSecurityPolicy, volume policy.FSType) bool {
-	if oldPSP == nil {
-		return false
-	}
-	for _, v := range oldPSP.Spec.Volumes {
-		if v == volume {
-			return true
-		}
-	}
-	return false
-}

pkg/registry/policy/podsecuritypolicy/strategy_test.go

@@ -23,10 +23,7 @@ import (
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/validation/field"
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
-	featuregatetesting "k8s.io/component-base/featuregate/testing"
 	"k8s.io/kubernetes/pkg/apis/policy"
-	"k8s.io/kubernetes/pkg/features"
 )
 
 func TestAllowEphemeralVolumeType(t *testing.T) {
@@ -83,7 +80,6 @@ func TestAllowEphemeralVolumeType(t *testing.T) {
 		},
 	}
 
-	for _, enabled := range []bool{true, false} {
 	for _, oldPSPInfo := range pspInfo {
 		for _, newPSPInfo := range pspInfo {
 			oldPSP := oldPSPInfo.psp()
@@ -92,26 +88,17 @@ func TestAllowEphemeralVolumeType(t *testing.T) {
 				continue
 			}
 
-				t.Run(fmt.Sprintf("feature enabled=%v, old PodSecurityPolicySpec %v, new PodSecurityPolicySpec %v", enabled, oldPSPInfo.description, newPSPInfo.description), func(t *testing.T) {
+			t.Run(fmt.Sprintf("old PodSecurityPolicySpec %v, new PodSecurityPolicySpec %v", oldPSPInfo.description, newPSPInfo.description), func(t *testing.T) {
-					defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, enabled)()
-
 				var errs field.ErrorList
-					var expectErrors bool
 				if oldPSP == nil {
 					errs = Strategy.Validate(context.Background(), newPSP)
-						expectErrors = newPSPInfo.hasGenericVolume && !enabled
 				} else {
 					errs = Strategy.ValidateUpdate(context.Background(), newPSP, oldPSP)
-						expectErrors = !oldPSPInfo.hasGenericVolume && newPSPInfo.hasGenericVolume && !enabled
 				}
-					if expectErrors && len(errs) == 0 {
+				if len(errs) > 0 {
-						t.Error("expected errors, got none")
-					}
-					if !expectErrors && len(errs) > 0 {
 					t.Errorf("expected no errors, got: %v", errs)
 				}
 			})
 		}
 	}
-	}
 }

pkg/scheduler/framework/plugins/feature/feature.go

@@ -26,5 +26,4 @@ type Features struct {
 	EnableReadWriteOncePod             bool
 	EnableVolumeCapacityPriority       bool
 	EnableCSIStorageCapacity           bool
-	EnableGenericEphemeralVolume       bool
 }

pkg/scheduler/framework/plugins/nodevolumelimits/csi.go

@@ -56,8 +56,6 @@ type CSILimits struct {
 	randomVolumeIDPrefix string
 
 	translator InTreeToCSITranslator
-
-	enableGenericEphemeralVolume bool
 }
 
 var _ framework.FilterPlugin = &CSILimits{}
@@ -157,12 +155,6 @@ func (pl *CSILimits) filterAttachableVolumes(
 		case vol.PersistentVolumeClaim != nil:
 			pvcName = vol.PersistentVolumeClaim.ClaimName
 		case vol.Ephemeral != nil:
-			if newPod && !pl.enableGenericEphemeralVolume {
-				return fmt.Errorf(
-					"volume %s is a generic ephemeral volume, but that feature is disabled in kube-scheduler",
-					vol.Name,
-				)
-			}
 			// Generic ephemeral inline volumes also use a PVC,
 			// just with a computed name and certain ownership.
 			// That is checked below once the pvc object is
@@ -326,7 +318,6 @@ func NewCSI(_ runtime.Object, handle framework.Handle, fts feature.Features) (fr
 		scLister:             scLister,
 		randomVolumeIDPrefix: rand.String(32),
 		translator:           csitrans.New(),
-		enableGenericEphemeralVolume: fts.EnableGenericEphemeralVolume,
 	}, nil
 }
 

pkg/scheduler/framework/plugins/nodevolumelimits/csi_test.go

@@ -546,13 +546,6 @@ func TestCSILimits(t *testing.T) {
 			test:             "should not count in-tree and count csi volumes if migration is disabled (when scheduling in-tree volumes)",
 		},
 		// ephemeral volumes
-		{
-			newPod:      ephemeralVolumePod,
-			filterName:  "csi",
-			driverNames: []string{ebsCSIDriverName},
-			test:        "ephemeral volume feature disabled",
-			wantStatus:  framework.NewStatus(framework.Error, "volume xyz is a generic ephemeral volume, but that feature is disabled in kube-scheduler"),
-		},
 		{
 			newPod:           ephemeralVolumePod,
 			filterName:       "csi",
@@ -657,8 +650,6 @@ func TestCSILimits(t *testing.T) {
 				scLister:             getFakeCSIStorageClassLister(scName, test.driverNames[0]),
 				randomVolumeIDPrefix: rand.String(32),
 				translator:           csitrans.New(),
-
-				enableGenericEphemeralVolume: test.ephemeralEnabled,
 			}
 			gotStatus := p.Filter(context.Background(), nil, test.newPod, node)
 			if !reflect.DeepEqual(gotStatus, test.wantStatus) {

pkg/scheduler/framework/plugins/nodevolumelimits/non_csi.go

@@ -117,8 +117,6 @@ type nonCSILimits struct {
 	// It is used to prefix volumeID generated inside the predicate() method to
 	// avoid conflicts with any real volume.
 	randomVolumeIDPrefix string
-
-	enableGenericEphemeralVolume bool
 }
 
 var _ framework.FilterPlugin = &nonCSILimits{}
@@ -191,8 +189,6 @@ func newNonCSILimits(
 		pvcLister:            pvcLister,
 		scLister:             scLister,
 		randomVolumeIDPrefix: rand.String(32),
-
-		enableGenericEphemeralVolume: fts.EnableGenericEphemeralVolume,
 	}
 
 	return pl
@@ -293,12 +289,6 @@ func (pl *nonCSILimits) filterVolumes(pod *v1.Pod, newPod bool, filteredVolumes
 		case vol.PersistentVolumeClaim != nil:
 			pvcName = vol.PersistentVolumeClaim.ClaimName
 		case vol.Ephemeral != nil:
-			if !pl.enableGenericEphemeralVolume {
-				return fmt.Errorf(
-					"volume %s is a generic ephemeral volume, but that feature is disabled in kube-scheduler",
-					vol.Name,
-				)
-			}
 			// Generic ephemeral inline volumes also use a PVC,
 			// just with a computed name and certain ownership.
 			// That is checked below once the pvc object is

pkg/scheduler/framework/plugins/nodevolumelimits/non_csi_test.go

@@ -86,11 +86,6 @@ func TestEphemeralLimits(t *testing.T) {
 		test             string
 		wantStatus       *framework.Status
 	}{
-		{
-			newPod:     ephemeralVolumePod,
-			test:       "volume feature disabled",
-			wantStatus: framework.NewStatus(framework.Error, "volume xyz is a generic ephemeral volume, but that feature is disabled in kube-scheduler"),
-		},
 		{
 			newPod:           ephemeralVolumePod,
 			ephemeralEnabled: true,
@@ -123,9 +118,7 @@ func TestEphemeralLimits(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.test, func(t *testing.T) {
-			fts := feature.Features{
+			fts := feature.Features{}
-				EnableGenericEphemeralVolume: test.ephemeralEnabled,
-			}
 			node, csiNode := getNodeWithPodAndVolumeLimits("node", test.existingPods, int64(test.maxVols), filterName)
 			p := newNonCSILimits(filterName, getFakeCSINodeLister(csiNode), getFakeCSIStorageClassLister(filterName, driverName), getFakePVLister(filterName), append(getFakePVCLister(filterName), test.extraClaims...), fts).(framework.FilterPlugin)
 			gotStatus := p.Filter(context.Background(), nil, test.newPod, node)

pkg/scheduler/framework/plugins/registry.go

@@ -54,7 +54,6 @@ func NewInTreeRegistry() runtime.Registry {
 		EnableReadWriteOncePod:             feature.DefaultFeatureGate.Enabled(features.ReadWriteOncePod),
 		EnableVolumeCapacityPriority:       feature.DefaultFeatureGate.Enabled(features.VolumeCapacityPriority),
 		EnableCSIStorageCapacity:           feature.DefaultFeatureGate.Enabled(features.CSIStorageCapacity),
-		EnableGenericEphemeralVolume:       feature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume),
 	}
 
 	return runtime.Registry{

pkg/scheduler/framework/plugins/volumebinding/binder.go

@@ -692,12 +692,6 @@ func (b *volumeBinder) isVolumeBound(pod *v1.Pod, vol *v1.Volume) (bound bool, p
 	case vol.PersistentVolumeClaim != nil:
 		pvcName = vol.PersistentVolumeClaim.ClaimName
 	case vol.Ephemeral != nil:
-		if !utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume) {
-			return false, nil, fmt.Errorf(
-				"volume %s is a generic ephemeral volume, but that feature is disabled in kube-scheduler",
-				vol.Name,
-			)
-		}
 		// Generic ephemeral inline volumes also use a PVC,
 		// just with a computed name, and...
 		pvcName = ephemeral.VolumeClaimName(pod, vol)

pkg/scheduler/framework/plugins/volumebinding/binder_test.go

@@ -833,9 +833,6 @@ func TestFindPodVolumesWithoutProvisioning(t *testing.T) {
 		// If nil, makePod with podPVCs
 		pod *v1.Pod
 
-		// GenericEphemeralVolume feature enabled?
-		ephemeral bool
-
 		// Expected podBindingCache fields
 		expectedBindings []*BindingInfo
 
@@ -942,7 +939,6 @@ func TestFindPodVolumesWithoutProvisioning(t *testing.T) {
 				withNamespace("testns").
 				withNodeName("node1").
 				withGenericEphemeralVolume("no-such-pvc").Pod,
-			ephemeral:  true,
 			shouldFail: true,
 		},
 		"generic-ephemeral,with-pvc": {
@@ -952,7 +948,6 @@ func TestFindPodVolumesWithoutProvisioning(t *testing.T) {
 				withGenericEphemeralVolume("test-volume").Pod,
 			cachePVCs: []*v1.PersistentVolumeClaim{correctGenericPVC},
 			pvs:       []*v1.PersistentVolume{pvBoundGeneric},
-			ephemeral: true,
 		},
 		"generic-ephemeral,wrong-pvc": {
 			pod: makePod("test-pod").
@@ -961,17 +956,6 @@ func TestFindPodVolumesWithoutProvisioning(t *testing.T) {
 				withGenericEphemeralVolume("test-volume").Pod,
 			cachePVCs:  []*v1.PersistentVolumeClaim{conflictingGenericPVC},
 			pvs:        []*v1.PersistentVolume{pvBoundGeneric},
-			ephemeral:  true,
-			shouldFail: true,
-		},
-		"generic-ephemeral,disabled": {
-			pod: makePod("test-pod").
-				withNamespace("testns").
-				withNodeName("node1").
-				withGenericEphemeralVolume("test-volume").Pod,
-			cachePVCs:  []*v1.PersistentVolumeClaim{correctGenericPVC},
-			pvs:        []*v1.PersistentVolume{pvBoundGeneric},
-			ephemeral:  false,
 			shouldFail: true,
 		},
 	}
@@ -986,8 +970,6 @@ func TestFindPodVolumesWithoutProvisioning(t *testing.T) {
 	}
 
 	run := func(t *testing.T, scenario scenarioType, csiStorageCapacity bool, csiDriver *storagev1.CSIDriver) {
-		defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, scenario.ephemeral)()
-
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
 

pkg/scheduler/framework/plugins/volumebinding/volume_binding.go

@@ -71,7 +71,6 @@ func (d *stateData) Clone() framework.StateData {
 type VolumeBinding struct {
 	Binder    SchedulerVolumeBinder
 	PVCLister corelisters.PersistentVolumeClaimLister
-	GenericEphemeralVolumeFeatureEnabled bool
 	scorer    volumeCapacityScorer
 	fts       feature.Features
 }
@@ -131,7 +130,7 @@ func (pl *VolumeBinding) podHasPVCs(pod *v1.Pod) (bool, error) {
 		switch {
 		case vol.PersistentVolumeClaim != nil:
 			pvcName = vol.PersistentVolumeClaim.ClaimName
-		case vol.Ephemeral != nil && pl.GenericEphemeralVolumeFeatureEnabled:
+		case vol.Ephemeral != nil:
 			pvcName = ephemeral.VolumeClaimName(pod, &vol)
 			isEphemeral = true
 		default:
@@ -404,7 +403,6 @@ func New(plArgs runtime.Object, fh framework.Handle, fts feature.Features) (fram
 	return &VolumeBinding{
 		Binder:    binder,
 		PVCLister: pvcInformer.Lister(),
-		GenericEphemeralVolumeFeatureEnabled: fts.EnableGenericEphemeralVolume,
 		scorer:    scorer,
 		fts:       fts,
 	}, nil

pkg/security/podsecuritypolicy/provider_test.go

@@ -1417,7 +1417,6 @@ func moveContainersToEphemeral(in *api.Pod) *api.Pod {
 // the FSTypeAll wildcard.
 func TestValidateAllowedVolumes(t *testing.T) {
 	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.CSIInlineVolume, true)()
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, true)()
 
 	val := reflect.ValueOf(api.VolumeSource{})
 

plugin/pkg/admission/security/podsecuritypolicy/admission_test.go

@@ -630,7 +630,6 @@ func TestAdmitCaps(t *testing.T) {
 
 func TestAdmitVolumes(t *testing.T) {
 	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.CSIInlineVolume, true)()
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.GenericEphemeralVolume, true)()
 
 	val := reflect.ValueOf(kapi.VolumeSource{})
 

plugin/pkg/auth/authorizer/node/graph.go

@@ -21,11 +21,9 @@ import (
 	"time"
 
 	corev1 "k8s.io/api/core/v1"
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/component-helpers/storage/ephemeral"
 	pvutil "k8s.io/kubernetes/pkg/api/v1/persistentvolume"
 	podutil "k8s.io/kubernetes/pkg/api/v1/pod"
-	"k8s.io/kubernetes/pkg/features"
 	"k8s.io/kubernetes/third_party/forked/gonum/graph"
 	"k8s.io/kubernetes/third_party/forked/gonum/graph/simple"
 )
@@ -386,7 +384,7 @@ func (g *Graph) AddPod(pod *corev1.Pod) {
 		claimName := ""
 		if v.PersistentVolumeClaim != nil {
 			claimName = v.PersistentVolumeClaim.ClaimName
-		} else if v.Ephemeral != nil && utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume) {
+		} else if v.Ephemeral != nil {
 			claimName = ephemeral.VolumeClaimName(pod, &v)
 		}
 		if claimName != "" {

plugin/pkg/auth/authorizer/rbac/bootstrappolicy/controller_policy.go

@@ -193,7 +193,6 @@ func buildControllerRoles() ([]rbacv1.ClusterRole, []rbacv1.ClusterRoleBinding)
 		})
 	}
 
-	if utilfeature.DefaultFeatureGate.Enabled(features.GenericEphemeralVolume) {
 	addControllerRole(&controllerRoles, &controllerRoleBindings, rbacv1.ClusterRole{
 		ObjectMeta: metav1.ObjectMeta{Name: saRolePrefix + "ephemeral-volume-controller"},
 		Rules: []rbacv1.PolicyRule{
@@ -203,7 +202,6 @@ func buildControllerRoles() ([]rbacv1.ClusterRole, []rbacv1.ClusterRoleBinding)
 			eventsRule(),
 		},
 	})
-	}
 
 	addControllerRole(&controllerRoles, &controllerRoleBindings, rbacv1.ClusterRole{
 		ObjectMeta: metav1.ObjectMeta{Name: saRolePrefix + "generic-garbage-collector"},

staging/src/k8s.io/api/core/v1/generated.proto

@@ -5573,9 +5573,6 @@ message VolumeSource {
   // A pod can use both types of ephemeral volumes and
   // persistent volumes at the same time.
   //
-  // This is a beta feature and only available when the GenericEphemeralVolume
-  // feature gate is enabled.
-  //
   // +optional
   optional EphemeralVolumeSource ephemeral = 29;
 }

staging/src/k8s.io/api/core/v1/types.go

@@ -179,9 +179,6 @@ type VolumeSource struct {
 	// A pod can use both types of ephemeral volumes and
 	// persistent volumes at the same time.
 	//
-	// This is a beta feature and only available when the GenericEphemeralVolume
-	// feature gate is enabled.
-	//
 	// +optional
 	Ephemeral *EphemeralVolumeSource `json:"ephemeral,omitempty" protobuf:"bytes,29,opt,name=ephemeral"`
 }

staging/src/k8s.io/api/core/v1/types_swagger_doc_generated.go

@@ -2472,7 +2472,7 @@ var map_VolumeSource = map[string]string{
 	"scaleIO":               "ScaleIO represents a ScaleIO persistent volume attached and mounted on Kubernetes nodes.",
 	"storageos":             "StorageOS represents a StorageOS volume attached and mounted on Kubernetes nodes.",
 	"csi":                   "CSI (Container Storage Interface) represents ephemeral storage that is handled by certain external CSI drivers (Beta feature).",
-	"ephemeral":             "Ephemeral represents a volume that is handled by a cluster storage driver. The volume's lifecycle is tied to the pod that defines it - it will be created before the pod starts, and deleted when the pod is removed.\n\nUse this if: a) the volume is only needed while the pod runs, b) features of normal volumes like restoring from snapshot or capacity\n   tracking are needed,\nc) the storage driver is specified through a storage class, and d) the storage driver supports dynamic volume provisioning through\n   a PersistentVolumeClaim (see EphemeralVolumeSource for more\n   information on the connection between this volume type\n   and PersistentVolumeClaim).\n\nUse PersistentVolumeClaim or one of the vendor-specific APIs for volumes that persist for longer than the lifecycle of an individual pod.\n\nUse CSI for light-weight local ephemeral volumes if the CSI driver is meant to be used that way - see the documentation of the driver for more information.\n\nA pod can use both types of ephemeral volumes and persistent volumes at the same time.\n\nThis is a beta feature and only available when the GenericEphemeralVolume feature gate is enabled.",
+	"ephemeral":             "Ephemeral represents a volume that is handled by a cluster storage driver. The volume's lifecycle is tied to the pod that defines it - it will be created before the pod starts, and deleted when the pod is removed.\n\nUse this if: a) the volume is only needed while the pod runs, b) features of normal volumes like restoring from snapshot or capacity\n   tracking are needed,\nc) the storage driver is specified through a storage class, and d) the storage driver supports dynamic volume provisioning through\n   a PersistentVolumeClaim (see EphemeralVolumeSource for more\n   information on the connection between this volume type\n   and PersistentVolumeClaim).\n\nUse PersistentVolumeClaim or one of the vendor-specific APIs for volumes that persist for longer than the lifecycle of an individual pod.\n\nUse CSI for light-weight local ephemeral volumes if the CSI driver is meant to be used that way - see the documentation of the driver for more information.\n\nA pod can use both types of ephemeral volumes and persistent volumes at the same time.",
 }
 
 func (VolumeSource) SwaggerDoc() map[string]string {

test/e2e/storage/testsuites/ephemeral.go

@@ -119,6 +119,9 @@ func (p *ephemeralTestSuite) DefineTests(driver storageframework.TestDriver, pat
 			eDriver, _ = driver.(storageframework.EphemeralTestDriver)
 		}
 		if pattern.VolType == storageframework.GenericEphemeralVolume {
+			// The GenericEphemeralVolume feature is GA, but
+			// perhaps this test is run against an older Kubernetes
+			// where the feature might be disabled.
 			enabled, err := GenericEphemeralVolumesEnabled(f.ClientSet, f.Timeouts, f.Namespace.Name)
 			framework.ExpectNoError(err, "check GenericEphemeralVolume feature")
 			if !enabled {