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Block jobs that use additional BDSes or event loop resources need a callback to get their affairs in order when the AioContext is switched. Simple block jobs don't need an attach callback, they automatically work thanks to the generic attach/detach notifiers that this patch adds. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 1466096189-6477-7-git-send-email-stefanha@redhat.com