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

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Date:   Wed, 29 Nov 2017 12:55:15 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Al Viro <viro@...IV.linux.org.uk>
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 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.
-- 
Michal Hocko
SUSE Labs