How to enable "fast-diff" rbd image with csi?

[zhucan]

warning: fast-diff map is not enabled for csi-vol-be92926f-1893-11ed-a79b-de179ebd0891. operation may be slow.

[Madhu-1]

You can set it in rbd storageclass

ceph-csi/examples/rbd/storageclass.yaml

Line 37 in 54fe415

# imageFeatures: layering,journaling,exclusive-lock,object-map,fast-diff

[zhucan]

Thanks @Madhu-1