One workaround that comes to my mind is to power up the VM, write a large file 
and delete it and run fstrim -av.Another approach is to create an additional LV 
inside the guest, use dd to fill it in and then blkdiscard and delete the LV .
It will force the fisk to be fully allocated 
 
Best Regards,Strahil Nikolov
 
    Thanks Arik,

Is there a fix that can be applied to current versions as 4.5 release and 
subsequent testing/approval is some way off/
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