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

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Message-ID: <CA+55aFxEGKgx+_xy+Lnt=84wRzE9TyznL3VCNSqWs7HC_H35_A@mail.gmail.com>
Date:	Sun, 17 Jul 2011 16:38:24 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Hugh Dickins <hughd@...gle.com>,
	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 4:16 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> OR
>
>  - keep part of the patch from Hugh, treating negative in RCU mode as
> "need to unlazy".

No, urgh, that's horrible.

Not being able to do an RCU lookup of negative dentries would be
really sad. There are some loads where a negative dentry is the
*common* case.

                     Linus
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