linux-kernel - Re: NFS lockdep lock misordering mmap_sem<->i_mutex

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Message-ID: <20091216004826.GA3622@basil.fritz.box>
Date:	Wed, 16 Dec 2009 01:48:26 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	linux-kernel@...r.kernel.org, Trond.Myklebust@...app.com
Subject: Re: NFS lockdep lock misordering mmap_sem<->i_mutex_key with
	2.6.32-git1

> afaik, no revalidate mean "I don't mind the file was already removed
> at server, I only care client handle".
> 
> What's happen if we mmap removed file? 

I thought NFS only provided consistency around open/close/msync, not around
mmap? I've never been aware of mmap being a synchronization point.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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