resize fs in NodeStageVolume

While restoring from a snapshot to larger size PVC the volume needs to
be resized. We can use ResizeFs resizer (like extend already uses) in
NodeStageVolume to improve user experience and remove manual
intervention that is currently required after restoring to larger size.

pkg/ibmcsidriver/node.go

@@ -19,6 +19,8 @@ package ibmcsidriver
 
 import (
 	"fmt"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -307,6 +309,10 @@ func (csiNS *CSINodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeSt
 		return nil, commonError.GetCSIError(ctxLogger, commonError.FormatAndMountFailed, requestID, err, source, stagingTargetPath)
 	}
 
+	if _, err := mountmgr.Resize(csiNS.Mounter, devicePath, stagingTargetPath); err != nil {
+		return nil, commonError.GetCSIError(ctxLogger, commonError.FileSystemResizeFailed, requestID, err)
+	}
+
 	nodeStageVolumeResponse := &csi.NodeStageVolumeResponse{}
 	return nodeStageVolumeResponse, err
 }