> Just one question I think is important to the discussion: what about
> security?  If it is possible to recover unlinked files,

Only if they were still open at the time of the crash!

> is there anyway to guarantee that this information is NOT recoverable
> if the user wishes?

Close the file.  Or overwrite it, if you can't be sure there aren't
other processes with it open (in which latter case your security model
is probably shot anyway).

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