linux-kernel - Re: [PATCH 1/8] vfs: fix too big f

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Message-ID: <20100114051308.GA14616@ZenIV.linux.org.uk>
Date:	Thu, 14 Jan 2010 05:13:08 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	"Wu, Fengguang" <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Nick Piggin <npiggin@...e.de>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/8] vfs: fix too big f_pos handling

On Wed, Jan 13, 2010 at 10:09:56PM +0800, Wu, Fengguang wrote:
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Now, rw_verify_area() checsk f_pos is negative or not. And if
> negative, returns -EINVAL.
> 
> But, some special files as /dev/(k)mem and /proc/<pid>/mem etc..
> has negative offsets. And we can't do any access via read/write
> to the file(device).
> 
> This patch introduce a flag S_VERYBIG and allow negative file
> offsets.

Ehh...  FMODE_NEG_OFFSET in file->f_mode, perhaps?
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