[libvirt] Improvements to the RBD storage backend

[John Ferlan]

On 02/11/2016 11:04 AM, Wido den Hollander wrote:
> Hi,
> 
> After review by John Ferlan I'm sending a revised version of my earlier
> patch which adds the fast-diff feature for RBD volumes.
> 
> Before the patch there is one small improvement which is later used
> by the fast-diff feature.
> 
> The other is a bugfix where the #ifdef in the code wasn't requiring the
> right version of librbd.
> 
> Wido
> 
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Made one small adjustment to patch 3 to not set allocation twice (once
before the if and once inside the else).  It's only set in the else now.

ACK series and pushed.

John