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Re: [libvirt] [RFC PATCH 0/5] Allow data upload/download to/from storage volumes



On Mon, Mar 07, 2011 at 02:50:12PM -0500, Cole Robinson wrote:
> On 02/22/2011 08:23 AM, Daniel P. Berrange wrote:
> > This patch series introduces two new APIs to allow data upload/download
> > to/from storage volumes, using the streams APIs. Mostly I wrote this so
> > I had an easier way to test the streams handling in my RPC patch series
> > than using QEMU tunnelled migration code. Cole has expressed an interest
> > in this kind of functionality in the past to allow virt-manager to upload
> > kernel/initrd to remote hosts for provisioning guests.
> > 
> > Most of the code here is pretty boring & trivial. The first patch is the
> > one that is remotely interesting. One might argue we should just spawn
> > 'dd' instead of this, but dd has some annoying aspects (you can't control
> > its write offset in units smaller than the block size) and this could be
> > useful more broadly.
> > 
> 
> Hmm doesn't look like any of the CreateUpload stuff is implemented? Dropped
> from an earlier patch or just not finished yet? If that was implemented, I
> think it would be all virt-manager would really need to facilitate URL
> installation on remote machines.

Yes, I was going to do a CreateUpload method, but then the actual impl
in the storage driver was going to touch quite alot of code. So I dropped
it for since, since you could do the same thing by just doing a CreateXML
followed by Upload operation. Provided you don't pre-allocate in the
CreatXML method it wouldn't have any negative performance hit todo the
two separate steps.

Regards,
Daniel
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