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If a long-running operation on a BDS wants to always remain in the same AIO context, it somehow needs to keep track of the BDS changing its context. This adds a function for registering callbacks on a BDS which are called whenever the BDS is attached or detached from an AIO context. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>