Feature Request: Support Online PV Resizing

[varshavaradarajan]

What did you do? (required. The issue will be closed when not provided.)

Try to resize an in-use volume by changing the pvc.spec.request.storage value to higher than previously set: https://kubernetes.io/docs/concepts/storage/persistent-volumes/#csi-volume-expansion

What did you expect to happen?

I shouldn't have to delete the pod which has the volume mounted. Instead I get FileSystemResizePending: Waiting for user to (re-)start a pod to finish file system resize of volume on node.

Configuration (MUST fill this out):

• manifests, such as pvc, deployments, etc.. you used to reproduce:

---
kind: Pod
apiVersion: v1
metadata:
  name: my-csi-app
spec:
  containers:
    - name: my-frontend
      image: busybox
      volumeMounts:
      - mountPath: "/data"
        name: my-do-volume
      command: [ "sleep", "1000000" ]
  volumes:
    - name: my-do-volume
      persistentVolumeClaim:
        claimName: csi-pod-pvc
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: csi-pod-pvc
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  storageClassName: do-block-storage

Once volume is provisioned, kubectl edit pvc to change spec.resources.requests.storage to 8G. PV gets resized, But PVC capacity remains at 5G with the FileSystemResizePending message.

• CSI Version: v4.7.0 (also latest)

• Kubernetes Version: 1.26.9 (also on latest version )

• Cloud provider/framework version, if applicable (such as Rancher): 1.26.9-do.0 (also on latest version)