Re: [Qemu-devel] [PATCH 2/3] qcow2: add option to clean unused cache entries after some time

[Alberto Garcia]

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.

Berto