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

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Message-ID: <20081018205647.GA29946@1wt.eu>
Date:	Sat, 18 Oct 2008 22:56:47 +0200
From:	Willy Tarreau <w@....eu>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Hugh Dickins <hugh@...itas.com>, Peter Cordes <peter@...des.ca>,
	Bodo Eggert <7eggert@....de>,
	David Newall <davidn@...idnewall.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>
Subject: Re: no way to swapoff a deleted swap file?

On Sat, Oct 18, 2008 at 04:49:48PM -0400, Christoph Hellwig wrote:
> On Sat, Oct 18, 2008 at 09:45:14PM +0100, Hugh Dickins wrote:
> > --- 2.6.27/fs/namei.c	2008-10-09 23:13:53.000000000 +0100
> > +++ linux/fs/namei.c	2008-10-18 21:33:01.000000000 +0100
> > @@ -1407,7 +1407,7 @@ static int may_delete(struct inode *dir,
> >  	if (IS_APPEND(dir))
> >  		return -EPERM;
> >  	if (check_sticky(dir, victim->d_inode)||IS_APPEND(victim->d_inode)||
> > -	    IS_IMMUTABLE(victim->d_inode))
> > +	    IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
> >  		return -EPERM;
> >  	if (isdir) {
> >  		if (!S_ISDIR(victim->d_inode->i_mode))
> 
> Looks reasonable.

I like the idea and the simplicity a lot !

Willy

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