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block-backend: add drained_begin / drained_end ops
Allow block backends to forward drain requests to their devices/users. The initial intended purpose for this patch is to allow BBs to forward requests along to BlockJobs, which will want to pause if their associated BB has entered a drained region. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Message-id: 20170316212351.13797-3-jsnow@redhat.com Signed-off-by: Jeff Cody <jcody@redhat.com>
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