block/mirror: Add MirrorBDSOpaque
This will allow us to access the block job data when the mirror block driver becomes more complex. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Message-id: 20180613181823.13618-11-mreitz@redhat.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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