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Decreasing instance disk size


I am trying new havana version on my test system (on Ubuntu 12.04 LTS). I tried to resize a VM (Ubuntu 12.04 image), resizing to bigger flavor has no problem. When I try to resize instance to smaller flavor, root disk size remains same on instance but in openstack it shows the flavor size. I know that root disk size cannot be decreased on OS side, but Openstack should be aware of it and should show the old disk size.

Is there a workaround about this problem? For example, I want my users not be able to resize the instance to smaller one. Another workaround can be fixing the disk size to same for all flavors, but users will want to use the bigger root disks for windows machines.