Re: no way to swapoff a deleted swap file?

From: Peter Zijlstra
Date: Thu Oct 16 2008 - 04:28:08 EST

On Wed, 2008-10-15 at 17:21 -0300, Peter Cordes wrote:
> I unlinked a swapfile without realizing I was still swapping on it.
> Now my /proc/swaps looks like this:
> Filename Type Size Used Priority
> /var/tmp/EXP/cache/swap/1\040(deleted) file 1288644 1448 -1
> /var/tmp/EXP/cache/swap/2\040(deleted) file 1433368 0 -2
> AFAICT, there's nothing I can pass to swapoff(2) that will make the
> kernel let go of them. If that's the case, please consider this a
> feature request for a way to do this. Now I'm going to have to reboot
> before I can mkfs that partition.
> If kswapd0 had a fd open on the swap files, swapoff /proc/$PID/fd/3
> could possibly work. But it looks like the files are open but with no
> user-space accessable file descriptors to them. Which makes sense,
> except for this case.

Right, except that kswapd is per node, so we'd either have to add it to
all kswapd instances or a random one. Also, kthreads don't seem to have
a files table afaict.

But yes, I see your problem and it makes sense to look for a nice

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