From: Brad Campbell <lists2009@fnarfbargle.com>
To: Kevin Wolf <kwolf@redhat.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Qemu-img convert with -B
Date: Wed, 27 Apr 2011 22:02:22 +0800 [thread overview]
Message-ID: <4DB821EE.8010706@fnarfbargle.com> (raw)
In-Reply-To: <4DB8209A.7070400@redhat.com>
On 27/04/11 21:56, Kevin Wolf wrote:
> When you don't have a backing file, leaving an cluster unallocated means
> that it's zero. When you have a backing file, it could be anything. So
> if qemu-img convert wanted to save this space, it would have to read
> from the backing file and leave the cluster unallocated if it reads as zero.
>
> This is something that qemu-img doesn't do today.
... which would explain the behaviour I'm seeing then. Great, time to
dust off my Kernighan & Ritchie I guess.
Thanks for the explanation.
Regards,
Brad
next prev parent reply other threads:[~2011-04-27 14:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-27 3:05 [Qemu-devel] Qemu-img convert with -B Brad Campbell
2011-04-27 8:10 ` Stefan Hajnoczi
2011-04-27 8:56 ` Brad Campbell
2011-04-27 10:06 ` Kevin Wolf
2011-04-27 13:45 ` Brad Campbell
2011-04-27 13:56 ` Kevin Wolf
2011-04-27 14:02 ` Brad Campbell [this message]
2011-04-28 2:06 ` Brad Campbell
2011-04-28 6:36 ` Kevin Wolf
2011-04-28 9:38 ` Brad Campbell
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