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

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Message-ID: <8952.1294927845@jrobl>
Date:	Thu, 13 Jan 2011 23:10:45 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	Thomas Gleixner <tglx@...utronix.de>
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


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?


J. R. Okajima
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