From: Stefan Hajnoczi <stefanha@gmail.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Kevin Wolf <kwolf@redhat.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] qcow2: Add full image preallocation option
Date: Fri, 4 Feb 2011 10:59:59 +0000 [thread overview]
Message-ID: <20110204105959.GA24818@stefanha-thinkpad.localdomain> (raw)
In-Reply-To: <4D41AF53.8070701@codemonkey.ws>
On Thu, Jan 27, 2011 at 11:45:55AM -0600, Anthony Liguori wrote:
> On 01/27/2011 09:52 AM, Kevin Wolf wrote:
> >This adds a preallocation=full mode to qcow2 image creation, which does not
> >only allocate metadata for the whole image, but also writes zeros to it,
> >creating a non-sparse image file.
>
> The writing zeros bit is in order to support physical devices?
> Would it be better to have a flag in BlockDriverState that indicated
> whether uninitialized sectors could be assumed to be zero filled and
> key off of that?
There is already:
int bdrv_has_zero_init(BlockDriverState *bs);
Stefan
prev parent reply other threads:[~2011-02-04 11:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-27 15:52 [Qemu-devel] [PATCH] qcow2: Add full image preallocation option Kevin Wolf
2011-01-27 15:58 ` Daniel P. Berrange
2011-01-27 17:50 ` Anthony Liguori
2011-01-28 8:46 ` Kevin Wolf
2011-01-28 8:22 ` Kevin Wolf
2011-01-28 10:49 ` Daniel P. Berrange
2011-01-27 17:45 ` Anthony Liguori
2011-02-04 10:59 ` Stefan Hajnoczi [this message]
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