linux-ext4 - Re: [PATCH 3/3] Add timeout feature

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Message-ID: <20080908171119.GB22521@infradead.org>
Date:	Mon, 8 Sep 2008 13:11:19 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Takashi Sato <t-sato@...jp.nec.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Oleg Nesterov <oleg@...sign.ru>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	"viro@...IV.linux.org.uk" <viro@...IV.linux.org.uk>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"xfs@....sgi.com" <xfs@....sgi.com>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"mtk.manpages@...glemail.com" <mtk.manpages@...glemail.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] Add timeout feature

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.

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