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

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Date:	Thu, 14 Jan 2010 14:42:50 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	"Wu, Fengguang" <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Heiko Carstens <heiko.carstens@...ibm.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 Thu, 14 Jan 2010 05:13:08 +0000
Al Viro <viro@...IV.linux.org.uk> wrote:

> 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?
> 
Any method is okay for me.
I was just not sure where I could modify without problem.
If modifing f_mode is allowed, I'll write new version.

Thank you for advice. 

I'm sorry that I don't have enough time this week. So, I'll try next week.
I think dropping this patch itself has no big influence to this patch set. 
(but debug will be harder ;)
Thanks,
-Kame

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