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Re: [Qemu-devel] [PATCH 0/3] qed: Add support for zero clusters
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH 0/3] qed: Add support for zero clusters |
Date: |
Mon, 11 Apr 2011 12:45:08 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
Am 17.12.2010 16:58, schrieb Stefan Hajnoczi:
> This patch series adds zero data clusters to QED. Clusters can be marked as
> zero clusters to store zeroed regions in a space-efficient way. The patch
> never actually creates new zero clusters but includes the I/O path support
> code
> to handle them if they are used by an image file.
>
> Image streaming and copy-on-read take advantage of zero data clusters to avoid
> expanding out zeroes from the backing file. Those features are separate
> patches that will come later but I'm presenting this patch now so we can get
> this core QED image format feature in before doing the first QEMU release
> containing QED.
>
> The first patch fixes up an issue with the QED merge where '^' characters were
> dropped from the QED specification.
>
> The last two patches document and implement zero clusters, which were
> originally implemented by Anthony Liguori <address@hidden>.
Thanks, applied all to the block branch.
Kevin
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