After upgrade, the resize capability is not working for the existing PV/PVC

[yanchicago]

Describe the bug

A clear and concise description of what the bug is.
After upgrade to ceph-csi 2.0.1, the resize feature only applies to a new PVC not the existing PVC.

Environment details

• Image/version of Ceph CSI driver: cephcsi:v2.0.1, csi-resizer:v0.4.0
• helm chart version
• Kubernetes cluster version: v1.16.4
• Logs

Steps to reproduce

Steps to reproduce the behavior:

1. Setup details: '...'
2. Deployment to trigger the issue '....'
3. See error

Note: It could be an enhancement?

1). Deployed rook ceph 1.1.7
2). Upgrade rook ceph cluster to 1.2.7
3). Force replace the existing storage class with additional parameters: "allowVolumeExpansion: true
" and "csi.storage.k8s.io/controller-expand-secret-name: rook-csi-rbd-provisioner".
4). Try "resize" an existing PVC of a statefulset, the operation failed with below error in csi-resizer pod.
Note: For the newly created PVC

I0413 18:03:23.398029       1 event.go:281] Event(v1.ObjectReference{Kind:"PersistentVolumeClaim", Namespace:"rook-ceph", Name:"my-block-testrookblk-0", UID:"6c444e06-1442-4018-bc45-30f39cc9e1a5", APIVersion:"v1", ResourceVersion:"76782351", FieldPath:""}): type: 'Warning' reason: 'VolumeResizeFailed' resize volume pvc-6c444e06-1442-4018-bc45-30f39cc9e1a5 failed: rpc error: code = Internal desc = provided secret is empty

Actual results

Describe what happened
The size of PVC stays as the same.

Expected behavior

A clear and concise description of what you expected to happen.
The size of PVC should be changed to the requested size provided by "resize"

Additional context

Add any other context about the problem here.

For example:

Any existing bug report which describe about the similar issue/behavior
There're two existing similar problems.
#783
#923

[Madhu-1]

I already created a kubernetes issue for the same kubernetes/kubernetes#88622

[Madhu-1]

This is not something can be done in cephcsi directly, this has to be fixed in kubernetes closing this one