On Fri, May 09, 2025 at 03:40:30PM -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. > > Signed-off-by: Eric Blake <ebl...@redhat.com> > > --- > > v3: Improve test with more cases > v4: drop -machine q35 from command line [Stefan], update to > match rework in rest of series > --- > tests/qemu-iotests/tests/mirror-sparse | 125 +++++++ > tests/qemu-iotests/tests/mirror-sparse.out | 365 +++++++++++++++++++++ > 2 files changed, 490 insertions(+) > create mode 100755 tests/qemu-iotests/tests/mirror-sparse > create mode 100644 tests/qemu-iotests/tests/mirror-sparse.out
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
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