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Date: Wed, 17 Jul 2013 09:03:11 -0700
Message-ID: <CA+55aFxdqzMY5VJoYaLmL=+=f2s1cbHHV-TjC3=taXpF-xov1w@mail.gmail.com>
Subject: Re: splice vs execve lockdep trace.
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Ben Myers <bpm@sgi.com>, Peter Zijlstra <peterz@infradead.org>,
        Oleg Nesterov <oleg@redhat.com>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Dave Jones <davej@redhat.com>, xfs@oss.sgi.com
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On Tue, Jul 16, 2013 at 10:51 PM, Dave Chinner <david@fromorbit.com> wrote:
>
> But When i say "stale data" I mean that the data being returned
> might not have originally belonged to the underlying file you are
> reading.

We're still talking at cross purposes then.

How the hell do you handle mmap() and page faulting?

Because if you return *that* kind of stale data, than you're horribly
horribly buggy. And you cannot *possibly* blame
generic_file_splice_read() on that.

                  Linus
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