[Sheepdog] [PATCH 0/5] modify the usage of snapshot and cloning

[FUJITA Tomonori]

On Wed, 3 Feb 2010 09:59:29 +0000
Chris Webb <chris at arachsys.com> wrote:

> FUJITA Tomonori <fujita.tomonori at lab.ntt.co.jp> writes:
> 
> > On Mon, 11 Jan 2010 00:02:12 +0900
> > MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp> wrote:
> > 
> > > - make a patch
> > >  $ shepherd diff src_vdi:src_tag dst_vdi:dst_tag > delta_file
> > 
> > I think that we should integrate this into qemu-img since this looks
> > useful with qcow2.
> 
> I think the only bit that needs internal sheepdog knowledge is a function to
> get a list of blocks which differ between two snapshots. A similar function
> could be written for qcow2 and then the rest of the code would be completely
> generic in qemu-img as far as I can see.

Yeah, exactly. we need to add some new functions to struct
BlockDriver for the block driver specific stuff.