block: unblock backup operations in backing file
Signed-off-by: NWen Congyang <wency@cn.fujitsu.com> Signed-off-by: NChanglong Xie <xiecl.fnst@cn.fujitsu.com> Signed-off-by: NWang WeiWei <wangww.fnst@cn.fujitsu.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Kashyap Chamarthy <kchamart@redhat.com> Message-id: 1469602913-20979-2-git-send-email-xiecl.fnst@cn.fujitsu.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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