linux-kernel - Re: [RFC][PATCH 0/9] File descriptor hot-unplug support

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Message-ID: <49E43F1D.3070400@kernel.org>
Date:	Tue, 14 Apr 2009 16:45:33 +0900
From:	Tejun Heo <tj@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	Al Viro <viro@...IV.linux.org.uk>,
	Hugh Dickins <hugh@...itas.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [RFC][PATCH 0/9] File descriptor hot-unplug support

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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