Re: [Qemu-devel] [PATCH] qcow3 - arbitrary metadata

[Laurent Vivier]

Le 28 juil. 08 à 21:56, Nathaniel McCallum a écrit :

> A project I'm working on requires the ability to store arbitrary  
> metadata in the VM disk image.  Thus, here is a patch that  
> implements that as qcow3.  It basically replaces the  
> header.backing_store_{offset|size} with header.metadata_{offset| 
> size}.  Metadata is then defined as NULL-byte separated 'key:value'  
> pairs.  The attached qcow3 then stores the backing file as 'Backing- 
> File:/home/me/backing_file.img' in the metadata section.  I've  
> included two patches.  One is the full patch against the latest SVN  
> (qcow3.patch).  The second patch is just the diff between qcow2.c  
> and qcow3.c so that you can easily see the changes.
>
> I've also wondered if it might be possible to backport these changes  
> into qcow2 instead of qcow3.  However, this would break older  
> versions of qemu that claim to support qcow2.
>
> Nathaniel
> <qcow3.patch><qcow2-qcow3.patch>

I think this has already been tried exactly one year ago modifying  
snapshot...

http://www.mail-archive.com/address@hidden/msg05103.html

but now Fabrice is working on a configuration file, perhaps you can  
store your metadata in it.

Cheers,
Laurent
----------------------- Laurent Vivier ----------------------
"The best way to predict the future is to invent it."
- Alan Kay