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

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Message-id: <20081015202141.GX26067@cordes.ca>
Date:	Wed, 15 Oct 2008 17:21:41 -0300
From:	Peter Cordes <peter@...des.ca>
To:	linux-kernel@...r.kernel.org
Subject: no way to swapoff a deleted swap file?

 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.

 thanks, and happy hacking,

-- 
#define X(x,y) x##y
Peter Cordes ;  e-mail: X(peter@cor , des.ca)

"The gods confound the man who first found out how to distinguish the hours!
 Confound him, too, who in this place set up a sundial, to cut and hack
 my day so wretchedly into small pieces!" -- Plautus, 200 BC
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