Re: [Qemu-devel] [RFC] Allow 'qemu-img convert' to preserve the backing file

[Ian Jackson]

Marc Bevand writes:
> Currently if qemu-img convert is used to convert for example a qcow1
> image (with a backing file) to a qcow2 image, the resulting image
> will have no backing file.

This kind of thing ought to be discussed with qemu upstream too,
surely ?  Perhaps even implemented there first.

> In order to preserve the backing file (to save disk space), qemu-img
> should offer a command line option to enable the feature. For this
> it needs to be made aware of BlockDrivers supporting backing files.

The best way to do this will probably involve a certain amount of
restructuring of the interface to the block drivers.  So definitely
something to discuss with upstream.

Ian.