On Thu, Apr 24, 2025 at 07:52:10PM -0500, Eric Blake wrote:
> Prove that blockdev-mirror can now result in sparse raw destination
> files, regardless of whether the source is raw or qcow2. By making
> this a separate test, it was possible to test effects of individual
> patches for the various pieces that all have to work together for a
> sparse mirror to be successful.
>
> Note that ./check -file produces different job lengths than ./check
> -qcow2 (the test uses a filter to normalize); that's because when
> deciding how much of the image to be mirrored, the code looks at how
> much of the source image was allocated (for qcow2, this is only the
> written clusters; for raw, it is the entire file). But the important
> part is that the destination file ends up smaller than 3M, rather than
> the 20M it used to be before this patch series.
>
> +
> +filter_len() {
> + sed -e 's/"len": [0-9]*/"len": LEN/g' \
> + -e 's/"offset": [0-9]*/"offset": OFFSET/g'
> +}
This duplicates _filter_block_job_offset and _filter_block_job_len in
common.filter.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc.
Virtualization: qemu.org | libguestfs.org
