On 03/05/2012 10:34 AM, Paolo Bonzini wrote:
> With it comes a new image creation mode, "no-backing-file", that can
> be used to stream an image so that the destination does not need the
> original image's backing file(s).
>
> Both bdrv_append and blkmirror will set the backing_hd on the target,
> even if the image is created without one, so that both streaming and
> copy-on-write work properly (at least with qcow2 or qed, not raw).
>
> Streaming mode works with the following gotchas:
>
> - streaming will rewrite every bit of the source image;
>
> - zero writes are not supported by the blkmirror driver, hence both
> the source and the destination image will grow to full size.
>
> @@ -1159,7 +1175,8 @@
> ##
> { 'union': 'BlockdevAction',
> 'data': {
> - 'blockdev-snapshot-sync': 'BlockdevSnapshot'
> + 'blockdev-snapshot-sync': 'BlockdevSnapshot',Minor nit - should we rebase this trailing comma earlier in the series, to make it obvious that BlockdevAction will grow and for less churn in this patch? -- Eric Blake ebl...@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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