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    SubjectRe: [RESEND] [PATCH] VFS: make file->f_pos access atomic on 32bit arch
    On Tue 2008-10-07 20:52:09, Matthew Wilcox wrote:
    > On Wed, Oct 08, 2008 at 01:35:44PM +1100, Nick Piggin wrote:
    > > Right you are. That's the fundamental question. The actual details of
    > > the fix and how likely the race is don't really matter until we
    > > answer the first question (except to say that the "fix" is never going
    > > to be free).
    > >
    > > We've lasted this long with the current semantics. So the natural
    > > reaction to anything that strengthens the semantics now is "why?". If
    > > we do that then we can basically never return to the weaker semantics.
    > > So there had better be a really good reason.
    >
    > And it's worth saying that letter-of-the-standard arguments aren't
    > necessarily enough. Linux does not honour the POSIX guarantee that
    > writes are atomic (if they cross page boundaries, it's not certain).
    > This seems like even more of a corner case to me.

    We have append-only files, and normal users should not be able to work
    around that restriction.
    Pavel
    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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