Hi,
I was away for a few days but I just came back. There's a ton of
patches that I'll try to review these days but I also have a question.
Let's create a QCOW2 image and pass a runtime option such as
l2-cache-size:
$ qemu -drive if=virtio,file=hd0.qcow2,l2-cache-size=10M
Now we make a snapshot:
(qemu) snapshot_blkdev virtio0 hd1.qcow2
And here's the backing file string of hd1.qcow2:
$ qemu-img info hd1.qcow2 | grep backing
backing file: json:{"driver": "qcow2", "l2-cache-size": "10M", "file":
{"driver": "file", "filename": "hd0.qcow2"}}
backing file format: qcow2
The problem is that this QCOW2 image cannot be opened with older
versions of QEMU (because of the "json:" syntax), although there's
nothing in the image itself that would prevent that.
Is this something we should deal with?
Berto
