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

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Message-ID: <AANLkTinYTitBfY-HFrND5pJH_YcYAtMfLJ-eL1y542WM@mail.gmail.com>
Date:	Fri, 14 Jan 2011 10:47:00 +0100
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Nick Piggin <npiggin@...il.com>,
	"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, Jan 14, 2011 at 10:29 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> 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

I guess several mentionned patches are now in [1] and I am testing
them against linux-next (next-20110114).

- Sedat -

[1] http://git.kernel.org/?p=linux/kernel/git/npiggin/linux-npiggin.git;a=shortlog;h=refs/heads/vfs-scale-working
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