qemu-iotests: Test unaligned sub-block zero write
Test zero write in byte range 512~1024 for 4k alignment. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Message-id: 1431522721-3266-4-git-send-email-famz@redhat.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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