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

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Message-ID: <Pine.LNX.4.64.0810171250410.22374@blonde.site>
Date:	Fri, 17 Oct 2008 13:17:17 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Bodo Eggert <7eggert@....de>
cc:	David Newall <davidn@...idnewall.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?

On Fri, 17 Oct 2008, Bodo Eggert wrote:
> 
> Somebody might want their swapfiles to have zero links,
> _and_ the possibility of doing swapoff.

You're right, they might, and it's not an unreasonable wish.
But we've not supported it in the past, and I still don't
think it's worth adding special kernel support for it now.

> If you can do it by keeping some fds open to let
> /proc/pid/fd point to the files, I think it's OK.

I've a very strong aversion to adding strange code to abuse the
/proc/<pid>/fd space of some random kernel thread - a "kswapd"
because its name contains the substring "swap"?

Hugh
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