From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner+w=401wt.eu-S1753164AbYIHRLh@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753164AbYIHRLh (ORCPT <rfc822;w@1wt.eu>);
	Mon, 8 Sep 2008 13:11:37 -0400
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753081AbYIHRLY
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Mon, 8 Sep 2008 13:11:24 -0400
Received: from bombadil.infradead.org ([18.85.46.34]:52389 "EHLO
	bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1753091AbYIHRLX (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Mon, 8 Sep 2008 13:11:23 -0400
Date: Mon, 8 Sep 2008 13:11:19 -0400
From: Christoph Hellwig <hch@infradead.org>
To: Takashi Sato <t-sato@yk.jp.nec.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Christoph Hellwig <hch@infradead.org>, Oleg Nesterov <oleg@tv-sign.ru>,
       "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
       "dm-devel@redhat.com" <dm-devel@redhat.com>,
       "viro@ZenIV.linux.org.uk" <viro@ZenIV.linux.org.uk>,
       "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
       "xfs@oss.sgi.com" <xfs@oss.sgi.com>,
       "axboe@kernel.dk" <axboe@kernel.dk>,
       "mtk.manpages@googlemail.com" <mtk.manpages@googlemail.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/3] Add timeout feature
Message-ID: <20080908171119.GB22521@infradead.org>
References: <20080908205337t-sato@mail.jp.nec.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20080908205337t-sato@mail.jp.nec.com>
User-Agent: Mutt/1.5.18 (2008-05-17)
X-SRS-Rewrite: SMTP reverse-path rewritten from <hch@infradead.org> by bombadil.infradead.org
	See http://www.infradead.org/rpr.html
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Mon, Sep 08, 2008 at 08:53:37PM +0900, Takashi Sato wrote:
> The timeout feature is added to "freeze ioctl" to solve a deadlock
> when the freezer accesses a frozen filesystem. And new ioctl
> to reset the timeout period is added to extend the timeout period.
> For example, the freezer resets the timeout period to 10 seconds every 5
> seconds.  In this approach, even if the freezer causes a deadlock by
> accessing the frozen filesystem, it will be solved by the timeout
> in 10 seconds and the freezer will be able to recognize that
> at the next reset of timeout period.

And as with all previous posting I still fundamentally disagree about
the need of this functionality.  We don't need a timeout for freezing.