When image cache volume is enabled in cinder, any volume creation with smaller size than the image volume cache results in the size of image cache

Issue

• When image cache volume is enabled in cinder, any volume creation with smaller size than the image volume cache results in the size of image cache.
• For example, there is an image which consumes 800MiB. The first volume creation with the image requested 20GiB. By the first volume creation, the image cache volume is 20GiB. In the second volume creation, the request with the image is 1GiB. However, while cinder reported that the second volume size is 1GiB, the corresponding volume in storage consumed 20GiB.