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Re: [libvirt] [RFC] Image Fleecing for Libvirt (BZ 955734, 905125)



On Wed, Jul 24, 2013 at 10:51:35AM +0100, Daniel P. Berrange wrote:
> I'm wondering if we could instead try to utilize the virStreamPtr
> APIs for this task. From a libvirt's RPC POV this much more efficient
> because once you open the region with a stream API, you don't have any
> round trips at all - the data is pushed out to/from the client async.
> 
> Now those APIs are currently designed for sequential streaming of
> entire data regions only, but I wonder if we could extend them
> somehow to enable seek'ing within the stream. Alternatively perhaps
> we could just say if you want to read from dis-joint regions, that
> you can just re-open a stream for each region to be processed.

It'd be so much easier from a client point of view if you just exposed
the NBD Unix socket directly.  libvirt already exposes qemu sockets
directly (eg. console, virtio-serial sockets).  It should forward
those sockets from the remote side transparently too.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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