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qcow2: simple case support for downgrading of qcow2 images with zstd
If image doesn't have any compressed cluster we can easily switch to zlib compression, which may allow to downgrade the image. That's mostly needed to support IMGOPTS='compression_type=zstd' in some iotests which do qcow2 downgrade. While being here also fix checkpatch complain against '#' in printf formatting. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20211223160144.1097696-13-vsementsov@virtuozzo.com> Signed-off-by: Hanna Reitz <hreitz@redhat.com>
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