linux-kernel - Re: [announce] vfs-scale git tree update

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Message-ID: <AANLkTikNa8dqkwA617QG6hkMRrVLXNWO+1jBRhoaQdio@mail.gmail.com>
Date:	Thu, 13 Jan 2011 11:58:32 +1100
From:	Nick Piggin <npiggin@...il.com>
To:	Ian Kent <raven@...maw.net>
Cc:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>,
	aelder@....com, Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [announce] vfs-scale git tree update

On Wed, Jan 12, 2011 at 4:01 PM, Ian Kent <raven@...maw.net> wrote:
> On Wed, 2011-01-12 at 10:19 +0530, Aneesh Kumar K. V wrote:
>> for 9p I did the other way round. lookup now set the dentry op for both
>> negative and positive dentries and rest of the place we dropped
>> d_set_d_op (b8b80cf37c7f0e32729262f805bc0fa81c3e9d12 have the details)
>
> Sadly I can't do that.
>
> For now I need to avoid calls to ->d_revalidate() as much as possible to
> reduce a potential deadlock and have access to the flags of the negative
> dentry (during create) for the purpose of blocking concurrent walks.

What prevents your d_revalidate from just checking for negative dentry?
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