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

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Message-ID: <20110718234012.GL11013@ZenIV.linux.org.uk>
Date:	Tue, 19 Jul 2011 00:40:12 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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 Mon, Jul 18, 2011 at 04:27:53PM -0700, Linus Torvalds wrote:
> On Mon, Jul 18, 2011 at 4:21 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> >
> > Linus, are you OK with me slapping your s-o-b on it?
> 
> Yup.
> 
> And it feels so right that I think we should just do it for 3.0.
> 
> I was planning on doing that today, but I guess can delay it too. I'm
> at the Intel tech days tomorrow and the day after, but there's WiFi
> there and I'll have my laptop. The slightly bigger problem is that it
> will move the next merge window even further into my upcoming
> vacation, but I was planning on having the laptop with me there too,
> so whatever...
> 
> I assume I'll get the cifs_get_root() fix at the same time.

Yes.  Maybe btrfs get_default_root() one as well, if it survives beating;
also a missing i_mutex, along with seriously wrong use of d_splice_alias()
(it ignores the return value, for starters, and assumes that inode will
not be found in icache once all dentries pointing to it are off the alias
list)
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