Support creating snapshots from btrfs volumes

deploy/charts/rawfile-csi/templates/00-rbac.yaml

@@ -124,3 +124,34 @@ roleRef:
   kind: ClusterRole
   name: {{ include "rawfile-csi.fullname" . }}-resizer
   apiGroup: rbac.authorization.k8s.io
+---
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: {{ include "rawfile-csi.fullname" . }}-snapshotter
+rules:
+  - apiGroups: [""]
+    resources: ["events"]
+    verbs: ["list", "watch", "create", "update", "patch"]
+  - apiGroups: ["snapshot.storage.k8s.io"]
+    resources: ["volumesnapshotclasses"]
+    verbs: ["get", "list", "watch"]
+  - apiGroups: ["snapshot.storage.k8s.io"]
+    resources: ["volumesnapshotcontents"]
+    verbs: ["create", "get", "list", "watch", "update", "delete", "patch"]
+  - apiGroups: ["snapshot.storage.k8s.io"]
+    resources: ["volumesnapshotcontents/status"]
+    verbs: ["update", "patch"]
+---
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: {{ include "rawfile-csi.fullname" . }}-snapshotter
+subjects:
+  - kind: ServiceAccount
+    name: {{ include "rawfile-csi.fullname" . }}-driver
+    namespace: {{ .Release.Namespace }}
+roleRef:
+  kind: ClusterRole
+  name: {{ include "rawfile-csi.fullname" . }}-snapshotter
+  apiGroup: rbac.authorization.k8s.io

deploy/charts/rawfile-csi/templates/01-node-plugin.yaml

@@ -153,3 +153,20 @@ spec:
           volumeMounts:
             - name: socket-dir
               mountPath: /csi
+        - name: external-snapshotter
+          image: gcr.io/k8s-staging-sig-storage/csi-snapshotter:v5.0.1
+          imagePullPolicy: IfNotPresent
+          args:
+            - "--csi-address=$(ADDRESS)"
+            - "--node-deployment=true"
+            - "--extra-create-metadata=true"
+          env:
+            - name: ADDRESS
+              value: /csi/csi.sock
+            - name: NODE_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: spec.nodeName
+          volumeMounts:
+            - name: socket-dir
+              mountPath: /csi