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Is it possible to somehow list changed blocks or file system buffers that have not been written to the disk yet? How?

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I doubt that very much. Anyway, if you could, then whenever the system is not quiescent the list would almost certainly be out of date by the time you had a chance to consult it. –  Celada Jan 28 '13 at 15:54
    
@Celada I understand that it would be out dated pretty fast but I still think it would be interesting. –  ygram Jan 28 '13 at 16:11
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