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-Shrinking an image with qemu-img  does not reduce image file size
-Description of problem:
-I have a macOS 10.9 VM using a qcow2 image that was 151GB. The image was originally converted from a VMware image with:
-```
-qemu-img convert macOS-10.9.vmdk -O qcow2 -o preallocation=falloc macOS-10.9.qcow2
-```
-This resulted in `macOS-10.9.qcow2` being 151GB big:
-```
-$ du -h macOS-10.9.qcow2 
-151G     macOS-10.9.qcow2
-```
-After reducing the filesystem size from within macOS to 25GB with DiskUtil, I shut down the VM and resized the image to 30GB with:
-```
-qemu-img resize -f qcow2 --shrink macOS-10.9.qcow2 30G
-```
-This succeeded. However, the file still consumes 151GB of space:
-```
-$ du -h macOS-10.9.qcow2 
-151G     macOS-10.9.qcow2
-```
-Even though `qemu-img info` shows:
-```
-$ qemu-img info macOS-10.9.qcow2 
-image: macOS-10.9.qcow2
-file format: qcow2
-virtual size: 30 GiB (32212254720 bytes)
-disk size: 30 GiB
-cluster_size: 65536
-Format specific information:
-    compat: 1.1
-    compression type: zlib
-    lazy refcounts: false
-    refcount bits: 16
-    corrupt: false
-    extended l2: false
-```
-The size inside the VM is also reported as being 30GB.
-
-The whole point of resizing that image was to free up disk space on the host. But this doesn't seem to be happening.
-
-My filesystem is ext4.
-Steps to reproduce:
-1. Create a vmdk image with `qemu-img create -f vmdk test.vmdk 5G`
-2. Convert the vmdk image to qcow2 with `qemu-img convert test.vmdk -O qcow2 -o preallocation=falloc test.qcow2`
-3. Shrink the new image with `qemu-img resize -f qcow2 --shrink test.qcow2 3G`
-
-The resulting `test.qcow2` file should be 3GB, but it's not. It's 5GB.