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Re: [Qemu-devel] [RFC] Allow 'qemu-img convert' to preserve the backing
Re: [Qemu-devel] [RFC] Allow 'qemu-img convert' to preserve the backing file
Wed, 28 May 2008 10:55:12 +0100
> The best way to do this will probably involve a certain amount of
> restructuring of the interface to the block drivers. So definitely
> something to discuss with upstream.
Ignore all that.
I thought I was replying to a message on the xen-devel list.
Sorry, I'm very thickheaded today.
Right, changing context:
> Marc Bevand <address@hidden>:
> > In order to preserve the backing file (to save disk space),
> > qemu-img should offer a command line option to enable the
> > feature. For this it needs to be made aware of BlockDrivers
> > supporting backing files.
If there were a generic way to ask a block driver for a cow format
what the backing image filename was, then the block driver core could
do the opening itself. That would make everything a bit simpler as it
would move code out of the invididual drivers.