expander.go

/*
Copyright 2018 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package flexvolume

import (
	"fmt"
	"strconv"

	"k8s.io/apimachinery/pkg/api/resource"
	"k8s.io/kubernetes/pkg/volume"
)

func (plugin *flexVolumePlugin) ExpandVolumeDevice(spec *volume.Spec, newSize resource.Quantity, oldSize resource.Quantity) (resource.Quantity, error) {
	call := plugin.NewDriverCall(expandVolumeCmd)
	call.AppendSpec(spec, plugin.host, nil)

	devicePath, err := plugin.getDeviceMountPath(spec)
	if err != nil {
		return newSize, err
	}
	call.Append(devicePath)
	call.Append(strconv.FormatInt(newSize.Value(), 10))
	call.Append(strconv.FormatInt(oldSize.Value(), 10))

	_, err = call.Run()
	if isCmdNotSupportedErr(err) {
		return newExpanderDefaults(plugin).ExpandVolumeDevice(spec, newSize, oldSize)
	}
	return newSize, err
}

func (plugin *flexVolumePlugin) NodeExpand(rsOpt volume.NodeResizeOptions) (bool, error) {
	// This method is called after we spec.PersistentVolume.Spec.Capacity
	// has been updated to the new size. The underlying driver thus sees
	// the _new_ (requested) size and can find out the _current_ size from
	// its underlying storage implementation

	if rsOpt.VolumeSpec.PersistentVolume == nil {
		return false, fmt.Errorf("PersistentVolume not found for spec: %s", rsOpt.VolumeSpec.Name())
	}

	call := plugin.NewDriverCall(expandFSCmd)
	call.AppendSpec(rsOpt.VolumeSpec, plugin.host, nil)
	call.Append(rsOpt.DevicePath)
	call.Append(rsOpt.DeviceMountPath)
	call.Append(strconv.FormatInt(rsOpt.NewSize.Value(), 10))
	call.Append(strconv.FormatInt(rsOpt.OldSize.Value(), 10))

	_, err := call.Run()
	if isCmdNotSupportedErr(err) {
		return newExpanderDefaults(plugin).NodeExpand(rsOpt)
	}
	if err != nil {
		return false, err
	}
	return true, nil
}