[Qemu-devel] Re: [PATCH 2/2] New qemu-img convert -B option to preserve the COW aspect of images and/or re-base them

[Anthony Liguori <anthony@codemonkey.ws>]

Marc Bevand wrote:
> If a disk image hd_a is a copy-on-write image based on the backing
> file hd_base, it is currently impossible to use qemu-img to convert
> hd_a to hd_b (possibly using another disk image format) while keeping
> hd_b a copy-on-write image of hd_base. qemu-img also doesn't provide a
> feature that would let an enduser re-base a image, for example: adjust
> hd_a's backing file name from hd_base to hd_base2 if it had to change
> for some reason.
>
> This patch solves the 2 above problems by adding a new qemu-img
> convert -B option which works as described below. This is a generic
> feature that should work with ANY disk image format supporting backing
> files:
>   

Looks good to me.

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>

Regards,

Anthony Liguori