Support VM volume storage migration between different

volume and access modes. This allows the user to
live migration VMs from filesystem to block and vice
versa. It also allows the user to change the access
mode to RWX or RWO depending on their needs.

When creating the target volumes, use a datavolume
to create the appropriate PVCs, this allows the user
to select the storage profile to pick the correct
combination for the selected storage class.

Signed-off-by: Alexander Wels <awels@redhat.com>

config/crds/migration.openshift.io_directvolumemigrations.yaml

@@ -177,6 +177,10 @@ spec:
                       description: TargetStorageClass storage class of the migrated
                         PVC in the target cluster
                       type: string
+                    targetVolumeMode:
+                      description: TargetVolumeMode volume mode of the migrated PVC
+                        in the target cluster
+                      type: string
                     uid:
                       description: |-
                         UID of the referent.

pkg/apis/migration/v1alpha1/directvolumemigration_types.go

@@ -41,6 +41,8 @@ type PVCToMigrate struct {
 	TargetStorageClass string `json:"targetStorageClass"`
 	// TargetAccessModes access modes of the migrated PVC in the target cluster
 	TargetAccessModes []kapi.PersistentVolumeAccessMode `json:"targetAccessModes"`
+	// TargetVolumeMode volume mode of the migrated PVC in the target cluster
+	TargetVolumeMode *kapi.PersistentVolumeMode `json:"targetVolumeMode,omitempty"`
 	// TargetNamespace namespace of the migrated PVC in the target cluster
 	TargetNamespace string `json:"targetNamespace,omitempty"`
 	// TargetName name of the migrated PVC in the target cluster

pkg/controller/directvolumemigration/descriptions.go

@@ -25,7 +25,6 @@ var phaseDescriptions = map[string]string{
 	CreateDestinationNamespaces:          "Creating target namespaces",
 	DestinationNamespacesCreated:         "Checking if the target namespaces have been created.",
 	CreateDestinationPVCs:                "Creating PVCs in the target namespaces",
-	DestinationPVCsCreated:               "Checking whether the created PVCs are bound",
 	CreateRsyncRoute:                     "Creating one route for each namespace for Rsync on the target cluster",
 	CreateRsyncConfig:                    "Creating a config map and secrets on both the source and target clusters for Rsync configuration",
 	CreateStunnelConfig:                  "Creating a config map and secrets for Stunnel to connect to Rsync on the source and target clusters",

pkg/controller/directvolumemigration/pvcs.go

@@ -6,6 +6,7 @@ import (
 
 	liberr "github.com/konveyor/controller/pkg/error"
 	migapi "github.com/konveyor/mig-controller/pkg/apis/migration/v1alpha1"
+	"github.com/konveyor/mig-controller/pkg/compat"
 	"github.com/konveyor/mig-controller/pkg/settings"
 	corev1 "k8s.io/api/core/v1"
 	k8serror "k8s.io/apimachinery/pkg/api/errors"
@@ -40,124 +41,158 @@ func (t *Task) createDestinationPVCs() error {
 	if migration != nil {
 		migrationUID = string(migration.UID)
 	}
+	namespaceVMMap := make(map[string]map[string]string)
 	for _, pvc := range t.Owner.Spec.PersistentVolumeClaims {
-		// Get pvc definition from source cluster
-		srcPVC := corev1.PersistentVolumeClaim{}
-		key := types.NamespacedName{Name: pvc.Name, Namespace: pvc.Namespace}
-		err = srcClient.Get(context.TODO(), key, &srcPVC)
-		if err != nil {
-			return err
+		if _, ok := namespaceVMMap[pvc.Namespace]; !ok {
+			vmMap, err := getVolumeNameToVmMap(srcClient, pvc.Namespace)
+			if err != nil {
+				return err
+			}
+			namespaceVMMap[pvc.Namespace] = vmMap
 		}
-
-		plan := t.PlanResources.MigPlan
-		matchingMigPlanPV := t.findMatchingPV(plan, pvc.Name, pvc.Namespace)
-		pvcRequestedCapacity := srcPVC.Spec.Resources.Requests[corev1.ResourceStorage]
-
-		newSpec := srcPVC.Spec
-		newSpec.StorageClassName = &pvc.TargetStorageClass
-		newSpec.AccessModes = pvc.TargetAccessModes
-		newSpec.VolumeName = ""
-		// Remove DataSource and DataSourceRef from PVC spec so any populators or sources are not
-		// copied over to the destination PVC
-		newSpec.DataSource = nil
-		newSpec.DataSourceRef = nil
-
-		// Adjusting destination PVC storage size request
-		// max(requested capacity on source, capacity reported in migplan, proposed capacity in migplan)
-		if matchingMigPlanPV != nil && settings.Settings.DvmOpts.EnablePVResizing {
-			maxCapacity := pvcRequestedCapacity
-			// update maxCapacity if matching PV's capacity is greater than current maxCapacity
-			if matchingMigPlanPV.Capacity.Cmp(maxCapacity) > 0 {
-				maxCapacity = matchingMigPlanPV.Capacity
+		if _, ok := namespaceVMMap[pvc.Namespace][pvc.Name]; ok {
+			// VM associated with this PVC, create a datavolume
+			if err := t.createDestinationDV(srcClient, destClient, pvc, migrationUID); err != nil {
+				return err
 			}
-
-			// update maxcapacity if matching PV's proposed capacity is greater than current maxCapacity
-			if matchingMigPlanPV.ProposedCapacity.Cmp(maxCapacity) > 0 {
-				maxCapacity = matchingMigPlanPV.ProposedCapacity
+		} else {
+			if err := t.createDestinationPVC(srcClient, destClient, pvc, migrationUID); err != nil {
+				return err
 			}
-			newSpec.Resources.Requests[corev1.ResourceStorage] = maxCapacity
 		}
+	}
+	return nil
+}
 
-		//Add src labels and rollback labels
-		pvcLabels := srcPVC.Labels
-		if pvcLabels == nil {
-			pvcLabels = make(map[string]string)
-		}
-		// Merge DVM correlation labels into PVC labels for debug view
-		corrLabels := t.Owner.GetCorrelationLabels()
-		for k, v := range corrLabels {
-			pvcLabels[k] = v
-		}
+func (t *Task) createDestinationDV(srcClient, destClient compat.Client, pvc migapi.PVCToMigrate, migrationUID string) error {
+	destPVC, err := t.createDestinationPVCDefinition(srcClient, pvc, migrationUID)
+	if err != nil {
+		return err
+	}
+	destPVC.Spec.VolumeMode = pvc.TargetVolumeMode
+	return createBlankDataVolumeFromPVC(destClient, destPVC)
+}
 
-		if migrationUID != "" && t.PlanResources != nil && t.PlanResources.MigPlan != nil {
-			pvcLabels[migapi.MigMigrationLabel] = migrationUID
-			pvcLabels[migapi.MigPlanLabel] = string(t.PlanResources.MigPlan.UID)
-		} else if t.Owner.UID != "" {
-			pvcLabels[MigratedByDirectVolumeMigration] = string(t.Owner.UID)
+func (t *Task) createDestinationPVC(srcClient, destClient compat.Client, pvc migapi.PVCToMigrate, migrationUID string) error {
+	destPVC, err := t.createDestinationPVCDefinition(srcClient, pvc, migrationUID)
+	if err != nil {
+		return err
+	}
+	destPVCCheck := corev1.PersistentVolumeClaim{}
+	err = destClient.Get(context.TODO(), types.NamespacedName{
+		Namespace: destPVC.Namespace,
+		Name:      destPVC.Name,
+	}, &destPVCCheck)
+	if k8serror.IsNotFound(err) {
+		err = destClient.Create(context.TODO(), destPVC)
+		if err != nil {
+			return err
 		}
+	} else if err == nil {
+		t.Log.Info("PVC already exists on destination", "namespace", pvc.Namespace, "name", pvc.Name)
+	} else {
+		return err
+	}
+	return nil
+}
 
-		destNs := pvc.Namespace
-		if pvc.TargetNamespace != "" {
-			destNs = pvc.TargetNamespace
-		}
-		destName := pvc.Name
-		if pvc.TargetName != "" {
-			destName = pvc.TargetName
-		}
+func (t *Task) createDestinationPVCDefinition(srcClient compat.Client, pvc migapi.PVCToMigrate, migrationUID string) (*corev1.PersistentVolumeClaim, error) {
+	// Get pvc definition from source cluster
+	srcPVC := corev1.PersistentVolumeClaim{}
+	key := types.NamespacedName{Name: pvc.Name, Namespace: pvc.Namespace}
+	err := srcClient.Get(context.TODO(), key, &srcPVC)
+	if err != nil {
+		return nil, err
+	}
 
-		annotations := map[string]string{}
-		// If a kubevirt disk PVC, copy annotations to destination PVC
-		if srcPVC.Annotations != nil && srcPVC.Annotations["cdi.kubevirt.io/storage.contentType"] == "kubevirt" {
-			annotations = srcPVC.Annotations
-			// Ensure that when we create a matching DataVolume, it will adopt this PVC
-			annotations["cdi.kubevirt.io/storage.populatedFor"] = destName
-			// Remove annotations indicating the PVC is bound or provisioned
-			delete(annotations, "pv.kubernetes.io/bind-completed")
-			delete(annotations, "volume.beta.kubernetes.io/storage-provisioner")
-			delete(annotations, "pv.kubernetes.io/bound-by-controller")
-			delete(annotations, "volume.kubernetes.io/storage-provisioner")
+	plan := t.PlanResources.MigPlan
+	matchingMigPlanPV := t.findMatchingPV(plan, pvc.Name, pvc.Namespace)
+	pvcRequestedCapacity := srcPVC.Spec.Resources.Requests[corev1.ResourceStorage]
+
+	newSpec := srcPVC.Spec
+	newSpec.StorageClassName = &pvc.TargetStorageClass
+	newSpec.AccessModes = pvc.TargetAccessModes
+	newSpec.VolumeName = ""
+	// Remove DataSource and DataSourceRef from PVC spec so any populators or sources are not
+	// copied over to the destination PVC
+	newSpec.DataSource = nil
+	newSpec.DataSourceRef = nil
+
+	// Adjusting destination PVC storage size request
+	// max(requested capacity on source, capacity reported in migplan, proposed capacity in migplan)
+	if matchingMigPlanPV != nil && settings.Settings.DvmOpts.EnablePVResizing {
+		maxCapacity := pvcRequestedCapacity
+		// update maxCapacity if matching PV's capacity is greater than current maxCapacity
+		if matchingMigPlanPV.Capacity.Cmp(maxCapacity) > 0 {
+			maxCapacity = matchingMigPlanPV.Capacity
 		}
 
-		// Create pvc on destination with same metadata + spec
-		destPVC := corev1.PersistentVolumeClaim{
-			ObjectMeta: metav1.ObjectMeta{
-				Name:        destName,
-				Namespace:   destNs,
-				Labels:      pvcLabels,
-				Annotations: annotations,
-			},
-			Spec: newSpec,
-		}
-		t.Log.Info("Creating PVC on destination MigCluster",
-			"persistentVolumeClaim", path.Join(pvc.Namespace, pvc.Name),
-			"destPersistentVolumeClaim", path.Join(destNs, pvc.Name),
-			"pvcStorageClassName", destPVC.Spec.StorageClassName,
-			"pvcAccessModes", destPVC.Spec.AccessModes,
-			"pvcRequests", destPVC.Spec.Resources.Requests,
-			"pvcDataSource", destPVC.Spec.DataSource,
-			"pvcDataSourceRef", destPVC.Spec.DataSourceRef)
-		destPVCCheck := corev1.PersistentVolumeClaim{}
-		err = destClient.Get(context.TODO(), types.NamespacedName{
-			Namespace: destNs,
-			Name:      destName,
-		}, &destPVCCheck)
-		if k8serror.IsNotFound(err) {
-			err = destClient.Create(context.TODO(), &destPVC)
-			if err != nil {
-				return err
-			}
-		} else if err == nil {
-			t.Log.Info("PVC already exists on destination", "namespace", pvc.Namespace, "name", pvc.Name)
-		} else {
-			return err
+		// update maxcapacity if matching PV's proposed capacity is greater than current maxCapacity
+		if matchingMigPlanPV.ProposedCapacity.Cmp(maxCapacity) > 0 {
+			maxCapacity = matchingMigPlanPV.ProposedCapacity
 		}
+		newSpec.Resources.Requests[corev1.ResourceStorage] = maxCapacity
 	}
-	return nil
-}
 
-func (t *Task) getDestinationPVCs() error {
-	// Ensure PVCs are bound and not in pending state
-	return nil
+	//Add src labels and rollback labels
+	pvcLabels := srcPVC.Labels
+	if pvcLabels == nil {
+		pvcLabels = make(map[string]string)
+	}
+	// Merge DVM correlation labels into PVC labels for debug view
+	corrLabels := t.Owner.GetCorrelationLabels()
+	for k, v := range corrLabels {
+		pvcLabels[k] = v
+	}
+
+	if migrationUID != "" && t.PlanResources != nil && t.PlanResources.MigPlan != nil {
+		pvcLabels[migapi.MigMigrationLabel] = migrationUID
+		pvcLabels[migapi.MigPlanLabel] = string(t.PlanResources.MigPlan.UID)
+	} else if t.Owner.UID != "" {
+		pvcLabels[MigratedByDirectVolumeMigration] = string(t.Owner.UID)
+	}
+
+	destNs := pvc.Namespace
+	if pvc.TargetNamespace != "" {
+		destNs = pvc.TargetNamespace
+	}
+	destName := pvc.Name
+	if pvc.TargetName != "" {
+		destName = pvc.TargetName
+	}
+
+	annotations := map[string]string{}
+	// If a kubevirt disk PVC, copy annotations to destination PVC
+	if srcPVC.Annotations != nil && srcPVC.Annotations["cdi.kubevirt.io/storage.contentType"] == "kubevirt" {
+		annotations = srcPVC.Annotations
+		// Ensure that when we create a matching DataVolume, it will adopt this PVC
+		annotations["cdi.kubevirt.io/storage.populatedFor"] = destName
+		// Remove annotations indicating the PVC is bound or provisioned
+		delete(annotations, "pv.kubernetes.io/bind-completed")
+		delete(annotations, "volume.beta.kubernetes.io/storage-provisioner")
+		delete(annotations, "pv.kubernetes.io/bound-by-controller")
+		delete(annotations, "volume.kubernetes.io/storage-provisioner")
+	}
+
+	// Create pvc on destination with same metadata + spec
+	destPVC := corev1.PersistentVolumeClaim{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:        destName,
+			Namespace:   destNs,
+			Labels:      pvcLabels,
+			Annotations: annotations,
+		},
+		Spec: newSpec,
+	}
+	t.Log.Info("Creating PVC on destination MigCluster",
+		"persistentVolumeClaim", path.Join(pvc.Namespace, pvc.Name),
+		"destPersistentVolumeClaim", path.Join(destNs, pvc.Name),
+		"pvcStorageClassName", destPVC.Spec.StorageClassName,
+		"pvcAccessModes", destPVC.Spec.AccessModes,
+		"pvcRequests", destPVC.Spec.Resources.Requests,
+		"pvcDataSource", destPVC.Spec.DataSource,
+		"pvcDataSourceRef", destPVC.Spec.DataSourceRef)
+	return &destPVC, nil
 }
 
 func (t *Task) findMatchingPV(plan *migapi.MigPlan, pvcName string, pvcNamespace string) *migapi.PV {

pkg/controller/directvolumemigration/task.go

@@ -34,7 +34,6 @@ const (
 	CreateDestinationNamespaces                 = "CreateDestinationNamespaces"
 	DestinationNamespacesCreated                = "DestinationNamespacesCreated"
 	CreateDestinationPVCs                       = "CreateDestinationPVCs"
-	DestinationPVCsCreated                      = "DestinationPVCsCreated"
 	CreateStunnelConfig                         = "CreateStunnelConfig"
 	CreateRsyncConfig                           = "CreateRsyncConfig"
 	CreateRsyncRoute                            = "CreateRsyncRoute"
@@ -127,7 +126,6 @@ var VolumeMigration = Itinerary{
 		{phase: CreateDestinationNamespaces},
 		{phase: DestinationNamespacesCreated},
 		{phase: CreateDestinationPVCs},
-		{phase: DestinationPVCsCreated},
 		{phase: DeleteStaleVirtualMachineInstanceMigrations},
 		{phase: CreateRsyncRoute},
 		{phase: EnsureRsyncRouteAdmitted},
@@ -322,16 +320,6 @@ func (t *Task) Run(ctx context.Context) error {
 		if err = t.next(); err != nil {
 			return liberr.Wrap(err)
 		}
-	case DestinationPVCsCreated:
-		// Get the PVCs on the destination and confirm they are bound
-		err := t.getDestinationPVCs()
-		if err != nil {
-			return liberr.Wrap(err)
-		}
-		t.Requeue = NoReQ
-		if err = t.next(); err != nil {
-			return liberr.Wrap(err)
-		}
 	case CreateRsyncRoute:
 		err := t.ensureRsyncEndpoints()
 		if err != nil {