linux-kernel - Re: [GIT PULL] Please pull NFS client bugfixes....

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Message-ID: <alpine.LFD.2.00.1001071633200.7821@localhost.localdomain>
Date:	Thu, 7 Jan 2010 16:34:33 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] Please pull NFS client bugfixes....

On Thu, 7 Jan 2010, Trond Myklebust wrote:
> 
> Yes. I want to pursue Peter Zijlstra's patches, which split up the mmap
> function into a set of parts which require the mmap_sem, and other parts
> which don't, and that adds a filesystem callback that allows for
> revalidation to occur outside the mmap_sem.

I'm sorry, but that just sounds STUPID.

Why?

Because it means that you can trivially take page faults before the thing 
is validated (think threads).

If that is ok, then why do the revalidate at all? Just do the open/close 
consistency and validate at open time, not mmap time.

		Linus
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