linux-kernel - Re: [PATCH v2] fs: handle shrinker registration failure in sget

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Date:   Sat, 9 Dec 2017 21:54:22 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] fs: handle shrinker registration failure in
 sget_userns

On Sat, Dec 09, 2017 at 08:59:22PM +0000, Al Viro wrote:
> On Wed, Nov 29, 2017 at 12:55:15PM +0100, Michal Hocko wrote:
> > On Thu 23-11-17 14:55:40, Al Viro wrote:
> > > On Thu, Nov 23, 2017 at 03:35:37PM +0100, Michal Hocko wrote:
> > > > Hopefully less screwed version.  But as I've said I am not really
> > > > familiar with the code and do not feel competent to change it so please
> > > > be very careful here. I've moved the shrinker registration to
> > > > alloc_super which turned out to be simpler.
> > > 
> > > I don't get it.  Why the hell do we need all that PITA in the first place?
> > > Just make sget_userns() end with
> > > 	if (unlikely(regsiter_shrinker(&s->s_shrink) != 0)) {
> > > 		deactivate_locked_super(s);
> > > 		s = ERR_PTR(-ENOMEM);
> > > 	}
> > > 	return s;
> > > and be done with that.  All there is to it...
> > 
> > Al, do you plan to push this fix? Tetsuo's unregister_shrinker
> > fortification is already in the mmotm tree.
> 
> Is it in any git branch I could pull from?  Or I could just throw it
> into vfs.git#for-linus before the fix above - up to you, folks...

Actually, looking at mmotm...  I don't see it there.  Which patch
is it in?