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qcow2: Assert that expand_zero_clusters_in_l1() does not support subclusters

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This function is only used by qcow2_expand_zero_clusters() to
downgrade a qcow2 image to a previous version. This would require
transforming all extended L2 entries into normal L2 entries but this
is not a simple task and there are no plans to implement this at the
moment.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <15e65112b4144381b4d8c0bdf8fb76b0d813e3d1.1594396418.git.berto@igalia.com>
[mreitz: Fixed comment style]
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Alberto Garcia 2020-07-10 18:13:15 +02:00 • committed by Max Reitz
parent 2118771ddf
commit 7bbb59202a
3 changed files with 23 additions and 2 deletions
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5
tests/qemu-iotests/061.out
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@ -533,6 +533,11 @@ Format specific information:
extended l2: false
No errors were found on the image.
=== Testing version downgrade with extended L2 entries ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
qemu-img: Cannot downgrade an image with incompatible features 0x10 set
=== Try changing the external data file ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864