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

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Date:	Tue, 12 Feb 2013 16:18:31 -0500
From:	Peter Staubach <pstaubach@...grid.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>,
	Stanislav Kinsbursky <skinsbursky@...allels.com>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...nvz.org" <devel@...nvz.org>
Subject: RE: [PATCH 0/2] NFSD: fix races in service per-net resources
 allocation

The "+" thing seems a little odd.  Why not use "||" instead?  The sum of the two returns isn't really the important thing, is it?  It is that either call to svc_close_list() returns non-zero.

	Thanx...

		ps


-----Original Message-----
From: linux-nfs-owner@...r.kernel.org [mailto:linux-nfs-owner@...r.kernel.org] On Behalf Of J. Bruce Fields
Sent: Tuesday, February 12, 2013 3:46 PM
To: Stanislav Kinsbursky
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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