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

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Message-Id: <201711240004.GGE82352.MVFtFLHOOOFSQJ@I-love.SAKURA.ne.jp>
Date:   Fri, 24 Nov 2017 00:04:23 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     viro@...IV.linux.org.uk, mhocko@...nel.org
Cc:     david@...morbit.com, jack@...e.cz, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v2] fs: handle shrinker registration failure insget_userns

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...
> 

Doesn't deactivate_locked_super() call unregister_shrinker() ?