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

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Message-ID: <alpine.LFD.2.00.1101141028350.2678@localhost6.localdomain6>
Date:	Fri, 14 Jan 2011 10:29:54 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Nick Piggin <npiggin@...il.com>
cc:	"J. R. Okajima" <hooanon05@...oo.co.jp>,
	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 Fri, 14 Jan 2011, Nick Piggin wrote:

> On Fri, Jan 14, 2011 at 3:41 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> > 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?
> >
> 
> Yeah thanks everyone for reporting this.
> 
> I have a fix for it in a slightly different way, and a couple of other reported
> bugs, which are going through stress testing now.

Can you point us to the patches, so we can run our own set of
tests in paralell?

Thanks,

	tglx