qcow2: Add iotest for an empty refcount table
This patch adds a simple iotest in which we try to write to an image with an empty refcount table (i.e. with all entries set to 0). This scenario was already handled by the existing consistency checks, but we add an explicit test case for completeness. Signed-off-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Message-id: 7e48b0e2ae1a0a18e0ee303b3045f130feec0474.1509718618.git.berto@igalia.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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