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Re: [Qemu-block] [PATCH 03/20] qcow2: Extend spec for external data file
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-block] [PATCH 03/20] qcow2: Extend spec for external data files |
Date: |
Fri, 1 Mar 2019 16:17:24 +0000 |
User-agent: |
Mutt/1.11.3 (2019-02-01) |
On Wed, Feb 27, 2019 at 06:22:39PM +0100, Kevin Wolf wrote:
> - Bits 2-63: Reserved (set to 0)
> + Bit 2: External data file bit. If this bit is set,
> an
> + external data file is used. Guest clusters
> are
> + then stored in the external data file. For
> such
> + images, clusters in the external data file
> are
> + not refcounted. The offset field in the
> + Standard Cluster Descriptor must match the
> + guest offset and neither compressed clusters
> + nor internal snapshots are supported.
> +
> + An external data file name header extension
> may
> + be present if this bit is set.
This sentence is clearer if the header extension name is made prominent:
An "external data file name" header extension
Or
An External Data File Name header extension
(In the previous paragraph Standard Cluster Descriptor is also
capitalized.)
> @@ -148,6 +170,7 @@ be stored. Each extension has a structure like the
> following:
> 0x6803f857 - Feature name table
> 0x23852875 - Bitmaps extension
> 0x0537be77 - Full disk encryption header pointer
> + 0x44415441 - External data file name
This new header extension isn't described in this patch?
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- Re: [Qemu-block] [PATCH 03/20] qcow2: Extend spec for external data files,
Stefan Hajnoczi <=