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Merge pull request #58617 from humblec/expand-idmpt

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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Make ExpandVolumeDevice() idempotent if existing volume capacity meets the requested size.

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>



**What this PR does / why we need it**:

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note

```
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Kubernetes Submit Queue 2018-01-26 09:07:41 -08:00 committed by GitHub
commit 175df0cba0
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15
pkg/volume/glusterfs/glusterfs.go
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@ -1132,6 +1132,21 @@ func (plugin *glusterfsPlugin) ExpandVolumeDevice(spec *volume.Spec, newSize res
expansionSize := (newSize.Value() - oldSize.Value())
expansionSizeGiB := int(volume.RoundUpSize(expansionSize, volume.GIB))
// Find out requested Size
requestGiB := volume.RoundUpToGiB(newSize)
//Check the existing volume size
currentVolumeInfo, err := cli.VolumeInfo(volumeID)
if err != nil {
glog.Errorf("error when fetching details of volume :%v", err)
return oldSize, err
}
if int64(currentVolumeInfo.Size) >= requestGiB {
return newSize, nil
}
// Make volume expansion request
volumeExpandReq := &gapi.VolumeExpandRequest{Size: expansionSizeGiB}