linux-kernel - Re: [PATCH] nlm_shutdown_hosts

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Date:   Mon, 30 Oct 2017 11:49:00 -0400
From:   Jeff Layton <jlayton@...hat.com>
To:     "J. Bruce Fields" <bfields@...ldses.org>,
        Vasily Averin <vvs@...tuozzo.com>
Cc:     linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nlm_shutdown_hosts_net() cleanup

On Mon, 2017-10-30 at 10:49 -0400, J. Bruce Fields wrote:
> On Mon, Oct 30, 2017 at 04:47:58PM +0300, Vasily Averin wrote:
> > nlm_complain_hosts() walk through nlm_server_hosts hlist that should be
> > protected by nlm_host_mutex.
> 
> I haven't looked at the NLM locking in ages.  Do we know who else might
> actually be accessing this list concurrently?
> 
> --b.
> 

Since this is a per-net-ns shutdown, I suppose you could have concurrent
 rpc.nfsd's shutting down different namespaces. Holding the mutex for
longer looks like a reasonable fix.

That said...I don't think lockd was ever properly namespace-ified. YMMV
here.

> > 
> > Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
> > ---
> >  fs/lockd/host.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/fs/lockd/host.c b/fs/lockd/host.c
> > index d716c99..089c1d7 100644
> > --- a/fs/lockd/host.c
> > +++ b/fs/lockd/host.c
> > @@ -617,9 +617,8 @@ nlm_shutdown_hosts_net(struct net *net)
> >  
> >  	/* Then, perform a garbage collection pass */
> >  	nlm_gc_hosts(net);
> > -	mutex_unlock(&nlm_host_mutex);
> > -
> >  	nlm_complain_hosts(net);
> > +	mutex_unlock(&nlm_host_mutex);
> >  }
> >  
> >  /*
> > -- 
> > 2.7.4
> 
> --
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Reviewed-by: Jeff Layton <jlayton@...hat.com>