Validate volumeMode in CnsRegisterVolume

Author: xing-yang

pkg/syncer/cnsoperator/controller/cnsregistervolume/cnsregistervolume_controller.go

@@ -534,6 +534,25 @@ func (r *ReconcileCnsRegisterVolume) Reconcile(ctx context.Context,
 		return reconcile.Result{RequeueAfter: timeout}, nil
 	}
 
+	// If existing PVC has DataSourceRef and volumeMode set, handle volumeMode validation and inheritance
+	if pvc != nil && pvc.Spec.DataSourceRef != nil && pvc.Spec.VolumeMode != nil {
+		if instance.Spec.VolumeMode == "" {
+			// Inherit the volumeMode from the existing PVC
+			log.Infof("Existing PVC %s in namespace %s has DataSourceRef and volumeMode set to %s. "+
+				"CnsRegisterVolume does not have volumeMode set. Inheriting volumeMode from existing PVC.",
+				pvc.Name, pvc.Namespace, *pvc.Spec.VolumeMode)
+			instance.Spec.VolumeMode = *pvc.Spec.VolumeMode
+		} else if instance.Spec.VolumeMode != *pvc.Spec.VolumeMode {
+			// Both are set but don't match - this is an error
+			msg := fmt.Sprintf("VolumeMode mismatch: existing PVC %s in namespace %s has volumeMode %s, "+
+				"but CnsRegisterVolume specifies volumeMode %s",
+				pvc.Name, pvc.Namespace, *pvc.Spec.VolumeMode, instance.Spec.VolumeMode)
+			log.Error(msg)
+			setInstanceError(ctx, r, instance, msg)
+			return reconcile.Result{RequeueAfter: timeout}, nil
+		}
+	}
+
 	// Do this check before creating a PV. Otherwise, PVC will be bound to PV after PV
 	// is created even if validation fails
 	if pvc != nil {
@@ -618,6 +637,13 @@ func (r *ReconcileCnsRegisterVolume) Reconcile(ctx context.Context,
 			setInstanceError(ctx, r, instance, msg)
 			return reconcile.Result{RequeueAfter: timeout}, nil
 		}
+	} else {
+		// PV exists - check if volumeMode needs correction
+		pv, err = validateAndFixPVVolumeMode(ctx, k8sclient, r, instance, pv, pvName, volumeID,
+			capacityInMb, accessMode, storageClassName, pvNodeAffinity, timeout)
+		if err != nil {
+			return reconcile.Result{RequeueAfter: timeout}, nil
+		}
 	}
 	// If PV is already bound to a different PVC at this point, then its a
 	// duplicate request.
@@ -1029,6 +1055,79 @@ func isBlockVolumeRegisterRequest(ctx context.Context, instance *cnsregistervolu
 	return false
 }
 
+// validateAndFixPVVolumeMode checks if an existing PV has the correct volumeMode.
+// If the volumeMode doesn't match what's expected, it untags the CNS volume, deletes
+// and recreates the PV with the correct volumeMode since volumeMode is immutable on PVs.
+func validateAndFixPVVolumeMode(ctx context.Context, k8sclient clientset.Interface,
+	r *ReconcileCnsRegisterVolume, instance *cnsregistervolumev1alpha1.CnsRegisterVolume,
+	pv *v1.PersistentVolume, pvName, volumeID string, capacityInMb int64,
+	accessMode v1.PersistentVolumeAccessMode, storageClassName string,
+	pvNodeAffinity *v1.VolumeNodeAffinity, timeout time.Duration) (*v1.PersistentVolume, error) {
+	log := logger.GetLogger(ctx)
+
+	// Determine expected volumeMode
+	expectedVolumeMode := instance.Spec.VolumeMode
+	if expectedVolumeMode == "" {
+		expectedVolumeMode = v1.PersistentVolumeFilesystem
+	}
+
+	// Get actual volumeMode from PV
+	pvVolumeMode := v1.PersistentVolumeFilesystem
+	if pv.Spec.VolumeMode != nil {
+		pvVolumeMode = *pv.Spec.VolumeMode
+	}
+
+	// Check if volumeMode matches
+	if expectedVolumeMode != pvVolumeMode {
+		log.Warnf("PV %s exists but has incorrect volumeMode. Expected: %s, Actual: %s. "+
+			"Untagging CNS volume and recreating PV with correct volumeMode.", pvName, expectedVolumeMode, pvVolumeMode)
+
+		// Untag the CNS volume before deleting PV to prevent underlying volume deletion.
+		// deleteDisk=false ensures the underlying vSphere disk is preserved.
+		log.Infof("Untagging CNS volume %s to preserve underlying disk before PV deletion", volumeID)
+		_, err := common.DeleteVolumeUtil(ctx, r.volumeManager, volumeID, false)
+		if err != nil {
+			msg := fmt.Sprintf("Failed to untag CNS volume %s. Error: %+v", volumeID, err)
+			log.Error(msg)
+			setInstanceError(ctx, r, instance, msg)
+			return nil, err
+		}
+		log.Infof("Successfully untagged CNS volume %s", volumeID)
+
+		// Delete the existing PV (underlying volume is safe due to CNS untag with deleteDisk=false)
+		err = k8sclient.CoreV1().PersistentVolumes().Delete(ctx, pvName, *metav1.NewDeleteOptions(0))
+		if err != nil {
+			msg := fmt.Sprintf("Failed to delete PV %s with incorrect volumeMode. Error: %+v", pvName, err)
+			log.Error(msg)
+			setInstanceError(ctx, r, instance, msg)
+			return nil, err
+		}
+		log.Infof("Successfully deleted PV %s with incorrect volumeMode", pvName)
+
+		// Recreate PV with correct volumeMode
+		claimRef := &v1.ObjectReference{
+			Kind:       "PersistentVolumeClaim",
+			APIVersion: "v1",
+			Namespace:  instance.Namespace,
+			Name:       instance.Spec.PvcName,
+		}
+		pvSpec := getPersistentVolumeSpec(pvName, volumeID, capacityInMb,
+			accessMode, instance.Spec.VolumeMode, storageClassName, claimRef)
+		pvSpec.Spec.NodeAffinity = pvNodeAffinity
+		log.Debugf("Recreating PV with spec: %+v", pvSpec)
+		pv, err = k8sclient.CoreV1().PersistentVolumes().Create(ctx, pvSpec, metav1.CreateOptions{})
+		if err != nil {
+			log.Errorf("Failed to recreate PV with spec: %+v. Error: %+v", pvSpec, err)
+			setInstanceError(ctx, r, instance,
+				fmt.Sprintf("Failed to recreate PV: %s with correct volumeMode. Error: %+v", pvName, err))
+			return nil, err
+		}
+		log.Infof("Successfully recreated PV %s with correct volumeMode: %s", pvName, expectedVolumeMode)
+	}
+
+	return pv, nil
+}
+
 // setInstanceError sets error and records an event on the CnsRegisterVolume
 // instance.
 func setInstanceError(ctx context.Context, r *ReconcileCnsRegisterVolume,