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vmdk: Don't update L2 table for zero write on zero cluster
If a cluster is already zeroed, we don't have to call vmdk_L2update(), which is rather slow because it flushes the image file. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20200430133007.170335-5-kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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