On Thu, Jan 10, 2019 at 8:04 PM Dave Chinner <david@xxxxxxxxxxxxx> wrote: > > So it will only read the single page we tried to access and won't > perturb the rest of the message encoded into subsequent pages in > file. Dave, you're being intentionally obtuse, aren't you? It's only that single page that *matters*. That's the page that the probe reveals the status of - but it's also the page that the probe then *changes* the status of. See? Think of it as "the act of measurement changes that which is measured". And that makes the measurement pointless. Linus