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

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Message-ID: <511A10E0.1000604@parallels.com>
Date:	Tue, 12 Feb 2013 13:52:32 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
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

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++);
 > +	}

?

Anyway, thanks!

Acked-by: Stanislav Kinsbursky <skinsbursky@...allels.com>

-- 
Best regards,
Stanislav Kinsbursky
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