linux-kernel - Re: [PATCH] vfs: fix race in rcu lookup of pruned dentry

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Message-ID: <CA+55aFzDtunzxNf9TGJMt+VVu-ox1eBb5m1Tbn=+50hR6_=Bqg@mail.gmail.com>
Date:	Sun, 17 Jul 2011 15:59:26 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...nel.dk>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] vfs: fix race in rcu lookup of pruned dentry

On Sun, Jul 17, 2011 at 3:00 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> The above (whitespace-damaged) patch may look trivial, but it is
> *entirely* untested, and maybe my gut feel that the above is the right
> way to solve the problem is just wrong.
>
> Al, any reactions? Hugh, does the above patch work for your
> stress-test case? Or, indeed, at all?

Hmm, it worked for my small test, including under memory pressure that
was shrinking dentries. But my test is not the kind of stress-test
that you clearly have, so that only means that it has not *really*
obvious breakages.

                     Linus
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