rbd: add skipForceFlatten flag

added skipForceFlatten flag to skip
the image deptha and skip image flattening.
This will be very useful if the kernel is
not listed in cephcsi which supports deep
flatten fauture.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

charts/ceph-csi-rbd/templates/provisioner-deployment.yaml

@@ -116,6 +116,9 @@ spec:
             - "--drivername=$(DRIVER_NAME)"
             - "--rbdhardmaxclonedepth={{ .Values.provisioner.hardMaxCloneDepth }}"
             - "--rbdsoftmaxclonedepth={{ .Values.provisioner.softMaxCloneDepth }}"
+            {{- if .Values.provisioner.skipForceFlatten }}
+            - "--skipforceflatten={{ .Values.provisioner.skipForceFlatten }}"
+            {{- end }}
           env:
             - name: POD_IP
               valueFrom:

charts/ceph-csi-rbd/values.yaml

@@ -113,6 +113,9 @@ provisioner:
   # Soft limit for maximum number of nested volume clones that are taken before
   # a flatten occurs
   softMaxCloneDepth: 4
+  # skip image flattening if kernel support mapping of rbd images
+  # which has the deep-flatten feature
+  # skipForceFlatten: false
 
   httpMetrics:
     # Metrics only available for cephcsi/cephcsi => 1.2.0