util: add CSIDriver.GetInstanceID()

There has been some confusion about using different variables for the
InstanceID of the RBD-driver. By removing the global variable
CSIInstanceID, there should be no confusion anymore what variable to
use.

Signed-off-by: Niels de Vos <ndevos@ibm.com>

cmd/cephcsi.go

@@ -70,8 +70,8 @@ func init() {
 	flag.StringVar(&conf.StagingPath, "stagingpath", defaultStagingPath, "staging path")
 	flag.StringVar(&conf.ClusterName, "clustername", "", "name of the cluster")
 	flag.BoolVar(&conf.SetMetadata, "setmetadata", false, "set metadata on the volume")
-	flag.StringVar(&conf.InstanceID, "instanceid", "", "Unique ID distinguishing this instance of Ceph CSI among other"+
-		" instances, when sharing Ceph clusters across CSI instances for provisioning")
+	flag.StringVar(&conf.InstanceID, "instanceid", "default", "Unique ID distinguishing this instance of Ceph-CSI"+
+		" among other instances, when sharing Ceph clusters across CSI instances for provisioning")
 	flag.IntVar(&conf.PidLimit, "pidlimit", 0, "the PID limit to configure through cgroups")
 	flag.BoolVar(&conf.IsControllerServer, "controllerserver", false, "start cephcsi controller server")
 	flag.BoolVar(&conf.IsNodeServer, "nodeserver", false, "start cephcsi node server")
@@ -249,6 +249,7 @@ func main() {
 			DriverName:  dname,
 			Namespace:   conf.DriverNamespace,
 			ClusterName: conf.ClusterName,
+			InstanceID:  conf.InstanceID,
 			SetMetadata: conf.SetMetadata,
 		}
 		// initialize all controllers before starting.

internal/controller/controller.go

@@ -39,6 +39,7 @@ type Config struct {
 	DriverName  string
 	Namespace   string
 	ClusterName string
+	InstanceID  string
 	SetMetadata bool
 }
 

internal/controller/persistentvolume/persistentvolume.go

@@ -189,6 +189,7 @@ func (r *ReconcilePersistentVolume) reconcilePV(ctx context.Context, obj runtime
 		requestName,
 		pvcNamespace,
 		r.config.ClusterName,
+		r.config.InstanceID,
 		r.config.SetMetadata,
 		cr)
 	if err != nil {

internal/csi-common/driver.go

@@ -30,6 +30,11 @@ type CSIDriver struct {
 	name    string
 	nodeID  string
 	version string
+
+	// instance is the instance ID that is unique to an instance of CSI, used when sharing
+	// ceph clusters across CSI instances, to differentiate omap names per CSI instance.
+	instance string
+
 	// topology constraints that this nodeserver will advertise
 	topology          map[string]string
 	capabilities      []*csi.ControllerServiceCapability
@@ -40,7 +45,7 @@ type CSIDriver struct {
 // NewCSIDriver Creates a NewCSIDriver object. Assumes vendor
 // version is equal to driver version &  does not support optional
 // driver plugin info manifest field. Refer to CSI spec for more details.
-func NewCSIDriver(name, v, nodeID string) *CSIDriver {
+func NewCSIDriver(name, v, nodeID, instance string) *CSIDriver {
 	if name == "" {
 		klog.Errorf("Driver name missing")
 
@@ -59,15 +64,27 @@ func NewCSIDriver(name, v, nodeID string) *CSIDriver {
 		return nil
 	}
 
+	if instance == "" {
+		klog.Errorf("Instance argument missing")
+
+		return nil
+	}
+
 	driver := CSIDriver{
-		name:    name,
-		version: v,
-		nodeID:  nodeID,
+		name:     name,
+		version:  v,
+		nodeID:   nodeID,
+		instance: instance,
 	}
 
 	return &driver
 }
 
+// GetInstance returns the instance identification of the CSI driver.
+func (d *CSIDriver) GetInstanceID() string {
+	return d.instance
+}
+
 // ValidateControllerServiceRequest validates the controller
 // plugin capabilities.
 func (d *CSIDriver) ValidateControllerServiceRequest(c csi.ControllerServiceCapability_RPC_Type) error {

internal/nfs/controller/controllerserver.go

@@ -45,8 +45,8 @@ type Server struct {
 // NewControllerServer initialize a controller server for ceph CSI driver.
 func NewControllerServer(d *csicommon.CSIDriver) *Server {
 	// global instance of the volume journal, yuck
-	store.VolJournal = journal.NewCSIVolumeJournalWithNamespace(cephfs.CSIInstanceID, fsutil.RadosNamespace)
-	store.SnapJournal = journal.NewCSISnapshotJournalWithNamespace(cephfs.CSIInstanceID, fsutil.RadosNamespace)
+	store.VolJournal = journal.NewCSIVolumeJournalWithNamespace(d.GetInstanceID(), fsutil.RadosNamespace)
+	store.SnapJournal = journal.NewCSISnapshotJournalWithNamespace(d.GetInstanceID(), fsutil.RadosNamespace)
 
 	return &Server{
 		backendServer: cephfs.NewControllerServer(d),

internal/nfs/driver/driver.go

@@ -39,7 +39,7 @@ func NewDriver() *Driver {
 // ceph CSI driver which can serve multiple parallel requests.
 func (fs *Driver) Run(conf *util.Config) {
 	// Initialize default library driver
-	cd := csicommon.NewCSIDriver(conf.DriverName, util.DriverVersion, conf.NodeID)
+	cd := csicommon.NewCSIDriver(conf.DriverName, util.DriverVersion, conf.NodeID, conf.InstanceID)
 	if cd == nil {
 		log.FatalLogMsg("failed to initialize CSI driver")
 	}

internal/rbd/driver/driver.go

@@ -100,7 +100,7 @@ func (r *Driver) Run(conf *util.Config) {
 	rbd.InitJournals(conf.InstanceID)
 
 	// Initialize default library driver
-	r.cd = csicommon.NewCSIDriver(conf.DriverName, util.DriverVersion, conf.NodeID)
+	r.cd = csicommon.NewCSIDriver(conf.DriverName, util.DriverVersion, conf.NodeID, conf.InstanceID)
 	if r.cd == nil {
 		log.FatalLogMsg("Failed to initialize CSI Driver.")
 	}
@@ -217,7 +217,7 @@ func (r *Driver) setupCSIAddonsServer(conf *util.Config) error {
 		fcs := casrbd.NewFenceControllerServer()
 		r.cas.RegisterService(fcs)
 
-		rcs := casrbd.NewReplicationServer(rbd.CSIInstanceID, NewControllerServer(r.cd))
+		rcs := casrbd.NewReplicationServer(conf.InstanceID, NewControllerServer(r.cd))
 		r.cas.RegisterService(rcs)
 
 		vgcs := casrbd.NewVolumeGroupServer(conf.InstanceID)

internal/rbd/globals.go

@@ -23,10 +23,6 @@ import (
 )
 
 var (
-	// CSIInstanceID is the instance ID that is unique to an instance of CSI, used when sharing
-	// ceph clusters across CSI instances, to differentiate omap names per CSI instance.
-	CSIInstanceID = "default"
-
 	// volJournal and snapJournal are used to maintain RADOS based journals for CO generated
 	// VolumeName to backing RBD images.
 	volJournal  *journal.Config
@@ -91,11 +87,6 @@ func SetGlobalBool(name string, value bool) {
 // NodeService where appropriate. Using global journals limits the ability to
 // configure these options based on the Ceph cluster or StorageClass.
 func InitJournals(instance string) {
-	// Use passed in instance ID, if provided for omap suffix naming
-	if instance != "" {
-		CSIInstanceID = instance
-	}
-
-	volJournal = journal.NewCSIVolumeJournal(CSIInstanceID)
-	snapJournal = journal.NewCSISnapshotJournal(CSIInstanceID)
+	volJournal = journal.NewCSIVolumeJournal(instance)
+	snapJournal = journal.NewCSISnapshotJournal(instance)
 }

internal/rbd/rbd_journal.go

@@ -547,7 +547,8 @@ func RegenerateJournal(
 	volumeID,
 	requestName,
 	owner,
-	clusterName string,
+	clusterName,
+	instanceID string,
 	setMetadata bool,
 	cr *util.Credentials,
 ) (string, error) {
@@ -595,7 +596,7 @@ func RegenerateJournal(
 	if rbdVol.JournalPool == "" {
 		rbdVol.JournalPool = rbdVol.Pool
 	}
-	volJournal = journal.NewCSIVolumeJournal(CSIInstanceID)
+	volJournal = journal.NewCSIVolumeJournal(instanceID)
 	j, err := volJournal.Connect(rbdVol.Monitors, rbdVol.RadosNamespace, cr)
 	if err != nil {
 		return "", err