linux-kernel - Re: no way to swapoff a deleted swap file?

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Message-Id: <E1KqkZK-0001HO-WF@be1.7eggert.dyndns.org>
Date:	Fri, 17 Oct 2008 10:20:22 +0200
From:	Bodo Eggert <7eggert@....de>
To:	David Newall <davidn@...idnewall.com>,
	Hugh Dickins <hugh@...itas.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Peter Cordes <peter@...des.ca>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: no way to swapoff a deleted swap file?

David Newall <davidn@...idnewall.com> wrote:
> Hugh Dickins wrote:
>> On Thu, 16 Oct 2008, Peter Zijlstra wrote:

>>> On Wed, 2008-10-15 at 17:21 -0300, Peter Cordes wrote:
>>>     
>>>> I unlinked a swapfile without realizing I was still swapping on it.

[...]

> Me too.  The kernel shouldn't protect the administrator against all
> possible mistakes; and this mistake is one of them.  Besides, who's to
> say it's always a mistake?  Somebody might want their swap file to have
> zero links.

Somebody might want their swapfiles to have zero links, _and_ the possibility
of doing swapoff. If you can do it by keeping some fds open to let
/proc/pid/fd point to the files, I think it's OK.

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