expander.go

Documentation: k8s.io/kubernetes/pkg/volume/flexvolume

     1  /*
     2  Copyright 2018 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package flexvolume
    18  
    19  import (
    20  	"fmt"
    21  	"strconv"
    22  
    23  	"k8s.io/apimachinery/pkg/api/resource"
    24  	"k8s.io/kubernetes/pkg/volume"
    25  )
    26  
    27  func (plugin *flexVolumePlugin) ExpandVolumeDevice(spec *volume.Spec, newSize resource.Quantity, oldSize resource.Quantity) (resource.Quantity, error) {
    28  	call := plugin.NewDriverCall(expandVolumeCmd)
    29  	call.AppendSpec(spec, plugin.host, nil)
    30  
    31  	devicePath, err := plugin.getDeviceMountPath(spec)
    32  	if err != nil {
    33  		return newSize, err
    34  	}
    35  	call.Append(devicePath)
    36  	call.Append(strconv.FormatInt(newSize.Value(), 10))
    37  	call.Append(strconv.FormatInt(oldSize.Value(), 10))
    38  
    39  	_, err = call.Run()
    40  	if isCmdNotSupportedErr(err) {
    41  		return newExpanderDefaults(plugin).ExpandVolumeDevice(spec, newSize, oldSize)
    42  	}
    43  	return newSize, err
    44  }
    45  
    46  func (plugin *flexVolumePlugin) NodeExpand(rsOpt volume.NodeResizeOptions) (bool, error) {
    47  	// This method is called after we spec.PersistentVolume.Spec.Capacity
    48  	// has been updated to the new size. The underlying driver thus sees
    49  	// the _new_ (requested) size and can find out the _current_ size from
    50  	// its underlying storage implementation
    51  
    52  	if rsOpt.VolumeSpec.PersistentVolume == nil {
    53  		return false, fmt.Errorf("PersistentVolume not found for spec: %s", rsOpt.VolumeSpec.Name())
    54  	}
    55  
    56  	call := plugin.NewDriverCall(expandFSCmd)
    57  	call.AppendSpec(rsOpt.VolumeSpec, plugin.host, nil)
    58  	call.Append(rsOpt.DevicePath)
    59  	call.Append(rsOpt.DeviceMountPath)
    60  	call.Append(strconv.FormatInt(rsOpt.NewSize.Value(), 10))
    61  	call.Append(strconv.FormatInt(rsOpt.OldSize.Value(), 10))
    62  
    63  	_, err := call.Run()
    64  	if isCmdNotSupportedErr(err) {
    65  		return newExpanderDefaults(plugin).NodeExpand(rsOpt)
    66  	}
    67  	if err != nil {
    68  		return false, err
    69  	}
    70  	return true, nil
    71  }
    72
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