From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tejun Heo <tj@kernel.org>
Subject: Re: [RFC][PATCH 0/9] File descriptor hot-unplug support
Date: Tue, 14 Apr 2009 16:45:33 +0900
Message-ID: <49E43F1D.3070400@kernel.org>
References: <m1skkf761y.fsf@fess.ebiederm.org> <49E4000E.10308@kernel.org> <m13acbbs5u.fsf@fess.ebiederm.org>
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Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
        linux-pci@vger.kernel.org, linux-mm@kvack.org,
        linux-fsdevel@vger.kernel.org, Al Viro <viro@ZenIV.linux.org.uk>,
        Hugh Dickins <hugh@veritas.com>, Alexey Dobriyan <adobriyan@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Alan Cox <alan@lxorguk.ukuu.org.uk>,
        Greg Kroah-Hartman <gregkh@suse.de>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Return-path: <owner-linux-mm@kvack.org>
In-Reply-To: <m13acbbs5u.fsf@fess.ebiederm.org>
Sender: owner-linux-mm@kvack.org
List-Id: linux-fsdevel.vger.kernel.org

Eric W. Biederman wrote:
> Do you know of a case where we actually have multiple tasks accessing
> a file simultaneously?

I don't have anything at hand but multithread/process server accepting
on the same socket comes to mind.  I don't think it would be a very
rare thing.  If you confine the scope to character devices or sysfs,
it could be quite rare tho.

> I just instrumented up my patch an so far the only case I have found
> are multiple processes closing the same file.  Some weird part of
> bash forking extra processes.

Hmmm...

Thanks.

-- 
tejun

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