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Date: Wed, 8 Sep 2010 22:23:36 +0200
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Kevin Wolf <kwolf@redhat.com>, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>, Stefan Hajnoczi <stefanha@gmail.com>, Alexander Graf <agraf@suse.de>, qemu-devel@nongnu.org, Avi Kivity <avi@redhat.com>, Christoph Hellwig <hch@lst.de>

On Wed, Sep 08, 2010 at 11:30:10AM -0500, Anthony Liguori wrote:
> http://wiki.qemu.org/Features/QED/OnlineDefrag
> 
> Is a spec for a very simple approach to online defrag that I hope we can 
> implement in the near future.  I think that once we have the mechanisms 
> to freeze clusters and to swap clusters, implementing much more 
> sophisticated defragmentation algorithms will become easy.

This image defragmentation might in fact cause even more fragmentation
at the filesystem layer.