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Re: [Qemu-devel] [partial RFC 1/2] qcow2: modify spec for deduplication
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [partial RFC 1/2] qcow2: modify spec for deduplication |
Date: |
Thu, 27 Sep 2012 09:02:20 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 |
On 09/27/2012 08:29 AM, Benoît Canet wrote:
> ---
> docs/specs/qcow2.txt | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt
> index 36a559d..e8bc189 100644
> --- a/docs/specs/qcow2.txt
> +++ b/docs/specs/qcow2.txt
> @@ -80,7 +80,10 @@ in the description of a field.
> tables to repair refcounts before accessing
> the
> image.
>
> - Bits 1-63: Reserved (set to 0)
> + Bit 1: Deduplication bit. If this bit is set then
> + deduplication is used on this image.
> +
> + Bits 2-63: Reserved (set to 0)
>
> 80 - 87: compatible_features
> Bitmask of compatible features. An implementation can
> @@ -116,6 +119,7 @@ be stored. Each extension has a structure like the
> following:
> 0x00000000 - End of the header extension area
> 0xE2792ACA - Backing file format name
> 0x6803f857 - Feature name table
> + 0xCD8E819B - Deduplication table offset and length
Missing a description of what this looks like (see the section on '==
Feature name table ==' for comparison).
--
Eric Blake address@hidden +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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