linux-kernel - Re: [PATCH] fs: Work around NFS wreckage

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Message-ID: <20110113151736.GW24920@pengutronix.de>
Date:	Thu, 13 Jan 2011 16:17:36 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	"J. R. Okajima" <hooanon05@...oo.co.jp>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...nel.dk>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org,
	"Ramirez Luna, Omar" <omar.ramirez@...com>
Subject: Re: [PATCH] fs: Work around NFS wreckage

Hello,

On Thu, Jan 13, 2011 at 11:10:45PM +0900, J. R. Okajima wrote:
> Thomas Gleixner:
> > The dcache scalability work broke NFS root filesystems.
> 	:::
> > Check for parent equal dentry and skip the nested lock to avoid the
> > deadlock. I'm sure this is the wrong fix, but at least it "works" :)
> 
> With this patch, can you unmount it cleanly?
> It skips incrementing d_count for both dentries.
> Do we need at least one?
If you tell me how to test that, I volunteer to try.
Something involving pivot_root?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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