linux-kernel - Re: [PATCH 0/2] NFSD: fix races in service per-net resources allocation

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Message-ID: <20130212204533.GD10267@fieldses.org>
Date:	Tue, 12 Feb 2013 15:45:34 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc:	akpm@...ux-foundation.org, linux-nfs@...r.kernel.org,
	Trond.Myklebust@...app.com, linux-kernel@...r.kernel.org,
	devel@...nvz.org
Subject: Re: [PATCH 0/2] NFSD: fix races in service per-net resources
 allocation

On Tue, Feb 12, 2013 at 01:52:32PM +0400, Stanislav Kinsbursky wrote:
> 12.02.2013 00:58, J. Bruce Fields пишет:
> <snip>
> >  void svc_close_net(struct svc_serv *serv, struct net *net)
> >  {
> >-	svc_close_list(serv, &serv->sv_tempsocks, net);
> >-	svc_close_list(serv, &serv->sv_permsocks, net);
> >-
> >-	svc_clear_pools(serv, net);
> >-	/*
> >-	 * At this point the sp_sockets lists will stay empty, since
> >-	 * svc_xprt_enqueue will not add new entries without taking the
> >-	 * sp_lock and checking XPT_BUSY.
> >-	 */
> >-	svc_clear_list(serv, &serv->sv_tempsocks, net);
> >-	svc_clear_list(serv, &serv->sv_permsocks, net);
> >+	int closed;
> >+	int delay = 0;
> >+
> >+again:
> >+	closed = svc_close_list(serv, &serv->sv_permsocks, net);
> >+	closed += svc_close_list(serv, &serv->sv_tempsocks, net);
> >+	if (closed) {
> >+		svc_clean_up_xprts(serv, net);
> >+		msleep(delay++);
> >+		goto again;
> >+	}
> 
> Frankly, this hunk above makes me feel sick... :(
> But I have no better idea right now...
> Maybe make this hunk a bit less weird (this is from my POW only, of course), like this:
> 
> > +	while (svc_close_list(serv, &serv->sv_permsocks, net) +
> > +	       svc_close_list(serv, &serv->sv_tempsocks, net)) {
> > +		svc_clean_up_xprts(serv, net);
> > +		msleep(delay++);
> > +	}
> 
> ?

OK, that's a little more compact at least.

--b.

> 
> Anyway, thanks!
> 
> Acked-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
> 
> -- 
> Best regards,
> Stanislav Kinsbursky
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