Pass snapshot metadata to CSI driver

cmd/csi-snapshotter/main.go

@@ -62,6 +62,7 @@ var (
 	showVersion            = flag.Bool("version", false, "Show version.")
 	threads                = flag.Int("worker-threads", 10, "Number of worker threads.")
 	csiTimeout             = flag.Duration("timeout", defaultCSITimeout, "The timeout for any RPCs to the CSI driver. Default is 1 minute.")
+	extraCreateMetadata    = flag.Bool("extra-create-metadata", false, "If set, add snapshot metadata to plugin snapshot requests as parameters.")
 
 	leaderElection          = flag.Bool("leader-election", false, "Enables leader election.")
 	leaderElectionNamespace = flag.String("leader-election-namespace", "", "The namespace where the leader election resource exists. Defaults to the pod namespace if not set.")
@@ -173,6 +174,7 @@ func main() {
 		*resyncPeriod,
 		*snapshotNamePrefix,
 		*snapshotNameUUIDLength,
+		*extraCreateMetadata,
 	)
 
 	run := func(context.Context) {

pkg/sidecar-controller/content_create_test.go

@@ -41,6 +41,11 @@ func TestSyncContent(t *testing.T) {
 					snapshotName: "snapshot-snapuid1-1",
 					driverName:   mockDriverName,
 					snapshotId:   "snapuid1-1",
+					parameters: map[string]string{
+						utils.PrefixedVolumeSnapshotNameKey:        "snap1-1",
+						utils.PrefixedVolumeSnapshotNamespaceKey:   "default",
+						utils.PrefixedVolumeSnapshotContentNameKey: "content1-1",
+					},
 					creationTime: timeNow,
 					readyToUse:   true,
 				},
@@ -63,6 +68,11 @@ func TestSyncContent(t *testing.T) {
 					snapshotName: "snapshot-snapuid1-2",
 					driverName:   mockDriverName,
 					snapshotId:   "snapuid1-2",
+					parameters: map[string]string{
+						utils.PrefixedVolumeSnapshotNameKey:        "snap1-2",
+						utils.PrefixedVolumeSnapshotNamespaceKey:   "default",
+						utils.PrefixedVolumeSnapshotContentNameKey: "content1-2",
+					},
 					creationTime: timeNow,
 					readyToUse:   true,
 					size:         defaultSize,
@@ -114,7 +124,13 @@ func TestSyncContent(t *testing.T) {
 				{
 					volumeHandle: "volume-handle-1-4",
 					snapshotName: "snapshot-snapuid1-4",
-					parameters:   class5Parameters,
+					parameters: map[string]string{
+						utils.AnnDeletionSecretRefName:             "secret",
+						utils.AnnDeletionSecretRefNamespace:        "default",
+						utils.PrefixedVolumeSnapshotNameKey:        "snap1-4",
+						utils.PrefixedVolumeSnapshotNamespaceKey:   "default",
+						utils.PrefixedVolumeSnapshotContentNameKey: "content1-4",
+					},
 					secrets: map[string]string{
 						"foo": "bar",
 					},

pkg/sidecar-controller/csi_handler.go

@@ -24,7 +24,6 @@ import (
 
 	crdv1 "github.com/kubernetes-csi/external-snapshotter/client/v3/apis/volumesnapshot/v1beta1"
 	"github.com/kubernetes-csi/external-snapshotter/v3/pkg/snapshotter"
-	"github.com/kubernetes-csi/external-snapshotter/v3/pkg/utils"
 )
 
 // Handler is responsible for handling VolumeSnapshot events from informer.
@@ -74,11 +73,7 @@ func (handler *csiHandler) CreateSnapshot(content *crdv1.VolumeSnapshotContent,
 	if err != nil {
 		return "", "", time.Time{}, 0, false, err
 	}
-	newParameters, err := utils.RemovePrefixedParameters(parameters)
+	return handler.snapshotter.CreateSnapshot(ctx, snapshotName, *content.Spec.Source.VolumeHandle, parameters, snapshotterCredentials)
-	if err != nil {
-		return "", "", time.Time{}, 0, false, fmt.Errorf("failed to remove CSI Parameters of prefixed keys: %v", err)
-	}
-	return handler.snapshotter.CreateSnapshot(ctx, snapshotName, *content.Spec.Source.VolumeHandle, newParameters, snapshotterCredentials)
 }
 
 func (handler *csiHandler) DeleteSnapshot(content *crdv1.VolumeSnapshotContent, snapshotterCredentials map[string]string) error {

pkg/sidecar-controller/framework_test.go

@@ -521,6 +521,7 @@ func newTestController(kubeClient kubernetes.Interface, clientset clientset.Inte
 		60*time.Second,
 		"snapshot",
 		-1,
+		true,
 	)
 
 	ctrl.eventRecorder = record.NewFakeRecorder(1000)

pkg/sidecar-controller/snapshot_controller.go

@@ -284,7 +284,17 @@ func (ctrl *csiSnapshotSideCarController) createSnapshotWrapper(content *crdv1.V
 		return nil, fmt.Errorf("failed to add VolumeSnapshotBeingCreated annotation on the content %s: %q", content.Name, err)
 	}
 
-	driverName, snapshotID, creationTime, size, readyToUse, err := ctrl.handler.CreateSnapshot(content, class.Parameters, snapshotterCredentials)
+	parameters, err := utils.RemovePrefixedParameters(class.Parameters)
+	if err != nil {
+		return nil, fmt.Errorf("failed to remove CSI Parameters of prefixed keys: %v", err)
+	}
+	if ctrl.extraCreateMetadata {
+		parameters[utils.PrefixedVolumeSnapshotNameKey] = content.Spec.VolumeSnapshotRef.Name
+		parameters[utils.PrefixedVolumeSnapshotNamespaceKey] = content.Spec.VolumeSnapshotRef.Namespace
+		parameters[utils.PrefixedVolumeSnapshotContentNameKey] = content.Name
+	}
+
+	driverName, snapshotID, creationTime, size, readyToUse, err := ctrl.handler.CreateSnapshot(content, parameters, snapshotterCredentials)
 	if err != nil {
 		// NOTE(xyang): handle create timeout
 		// If it is a final error, remove annotation to indicate

pkg/sidecar-controller/snapshot_controller_base.go

@@ -45,6 +45,7 @@ type csiSnapshotSideCarController struct {
 	driverName          string
 	eventRecorder       record.EventRecorder
 	contentQueue        workqueue.RateLimitingInterface
+	extraCreateMetadata bool
 
 	contentLister       storagelisters.VolumeSnapshotContentLister
 	contentListerSynced cache.InformerSynced
@@ -70,6 +71,7 @@ func NewCSISnapshotSideCarController(
 	resyncPeriod time.Duration,
 	snapshotNamePrefix string,
 	snapshotNameUUIDLength int,
+	extraCreateMetadata bool,
 ) *csiSnapshotSideCarController {
 	broadcaster := record.NewBroadcaster()
 	broadcaster.StartLogging(klog.Infof)
@@ -86,6 +88,7 @@ func NewCSISnapshotSideCarController(
 		resyncPeriod:        resyncPeriod,
 		contentStore:        cache.NewStore(cache.DeletionHandlingMetaNamespaceKeyFunc),
 		contentQueue:        workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "csi-snapshotter-content"),
+		extraCreateMetadata: extraCreateMetadata,
 	}
 
 	volumeSnapshotContentInformer.Informer().AddEventHandlerWithResyncPeriod(

pkg/utils/util.go

@@ -49,7 +49,9 @@ const (
 	// CSI Parameters prefixed with csiParameterPrefix are not passed through
 	// to the driver on CreateSnapshotRequest calls. Instead they are intended
 	// to be used by the CSI external-snapshotter and maybe used to populate
-	// fields in subsequent CSI calls or Kubernetes API objects.
+	// fields in subsequent CSI calls or Kubernetes API objects. An exception
+	// exists for the volume snapshot and volume snapshot content keys, which are
+	// passed as parameters on CreateSnapshotRequest calls.
 	csiParameterPrefix = "csi.storage.k8s.io/"
 
 	PrefixedSnapshotterSecretNameKey      = csiParameterPrefix + "snapshotter-secret-name"      // Prefixed name key for DeleteSnapshot secret
@@ -58,6 +60,10 @@ const (
 	PrefixedSnapshotterListSecretNameKey      = csiParameterPrefix + "snapshotter-list-secret-name"      // Prefixed name key for ListSnapshots secret
 	PrefixedSnapshotterListSecretNamespaceKey = csiParameterPrefix + "snapshotter-list-secret-namespace" // Prefixed namespace key for ListSnapshots secret
 
+	PrefixedVolumeSnapshotNameKey        = csiParameterPrefix + "volumesnapshot/name"        // Prefixed VolumeSnapshot name key
+	PrefixedVolumeSnapshotNamespaceKey   = csiParameterPrefix + "volumesnapshot/namespace"   // Prefixed VolumeSnapshot namespace key
+	PrefixedVolumeSnapshotContentNameKey = csiParameterPrefix + "volumesnapshotcontent/name" // Prefixed VolumeSnapshotContent name key
+
 	// Name of finalizer on VolumeSnapshotContents that are bound by VolumeSnapshots
 	VolumeSnapshotContentFinalizer = "snapshot.storage.kubernetes.io/volumesnapshotcontent-bound-protection"
 	// Name of finalizer on VolumeSnapshot that is being used as a source to create a PVC

pkg/utils/util_test.go

@@ -171,6 +171,8 @@ func TestRemovePrefixedCSIParams(t *testing.T) {
 			params: map[string]string{
 				PrefixedSnapshotterSecretNameKey:          "csiBar",
 				PrefixedSnapshotterSecretNamespaceKey:     "csiBar",
+				PrefixedSnapshotterListSecretNameKey:      "csiBar",
+				PrefixedSnapshotterListSecretNamespaceKey: "csiBar",
 			},
 			expectedParams: map[string]string{},
 		},