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Re: [Qemu-devel] [PATCH 2/3] qcow2: add option to clean unused cache ent

From: Alberto Garcia
Subject: Re: [Qemu-devel] [PATCH 2/3] qcow2: add option to clean unused cache entries after some time
Date: Thu, 28 May 2015 19:03:08 +0200
User-agent: Notmuch/0.13.2 (http://notmuchmail.org) Emacs/23.2.1 (i486-pc-linux-gnu)

On Thu 28 May 2015 06:44:55 PM CEST, Kevin Wolf wrote:
>> Yeah, I'm not sure such duplication helps.  I'd still like it
>> reported somewhere, though, as it is nice to query that a requested
>> setting is actually working.
> This isn't duplicated information. You can have ImageInfoSpecificQCow2
> show lazy_refcounts=off because that is what the image file contains,
> but the real value in effect could be lazy_refcounts=on.

That's right, ImageInfoSpecificQCow2 returns the value from the header
(s->compatible_features), not the runtime value (s->use_lazy_refcounts).

I think I'll resend the patch without the ImageInfo change. Querying the
runtime values is a task on its own.


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