I think you are supposed to do this using the fenced bufmgr over cached along with a (ideally userspace) fencing mechanism. If you can implement pb_busy, you should be able to implement fence_signalled in exactly the same way (making the fence handle a pointer to buffers should work for this purpose, if standalone fences are hard to do). The fenced bufmgr will only pass destruction requests to the wrapped bufmgr once the fences are signalled.
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