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Re: [Qemu-devel] proposed qcow2 extension: cluster reservations [was: [R

From: Kevin Wolf
Subject: Re: [Qemu-devel] proposed qcow2 extension: cluster reservations [was: [RFC] Proposed qcow2 extension: subcluster allocation
Date: Mon, 24 Apr 2017 13:45:27 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

Am 22.04.2017 um 19:56 hat Max Reitz geschrieben:
> On 21.04.2017 23:09, Eric Blake wrote:
> > And meanwhile, it looks like I have some patches to propose (and
> > qemu-iotests to write) if I can help fix the bugs I've pointed out.
> You mean these?
> https://github.com/XanClic/qemu/commits/random-qcow2-stuff-v1
> ;-)
> I'll send them once I've written tests.

You were quicker with writing the patches than I could reply that I
already started a patch to reuse preallocated zero clusters, but never
got around to finish it:


I seem to remember that it still had a problem (and probably also the
refcount > 0 bug that Eric mentioned), but maybe you can reuse at least
the test case from there.


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