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

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Date:	Fri, 14 Jan 2011 12:01:58 +1100
From:	Nick Piggin <npiggin@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
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, 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.

Thanks,
Nick
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