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

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Message-ID: <alpine.LFD.2.00.1101131732500.2678@localhost6.localdomain6>
Date:	Thu, 13 Jan 2011 17:41:58 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"J. R. Okajima" <hooanon05@...oo.co.jp>
cc:	Nick Piggin <npiggin@...nel.dk>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, u.kleine-koenig@...gutronix.de,
	"Ramirez Luna, Omar" <omar.ramirez@...com>
Subject: Re: [PATCH] fs: Work around NFS wreckage

On Thu, 13 Jan 2011, 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?

Not sure, as we should not end up there at all I guess.
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