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

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Date:	Mon, 29 Sep 2008 10:37:49 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Eric Sandeen <sandeen@...deen.net>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Takashi Sato <t-sato@...jp.nec.com>,
	Ric Wheeler <rwheeler@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...sign.ru>, linux-fsdevel@...r.kernel.org,
	dm-devel@...hat.com, viro@...IV.linux.org.uk,
	linux-ext4@...r.kernel.org, xfs@....sgi.com, axboe@...nel.dk,
	mtk.manpages@...glemail.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] Add timeout feature

On Mon, Sep 29, 2008 at 09:36:04AM -0500, Eric Sandeen wrote:
> Christoph Hellwig wrote:
> > On Fri, Sep 26, 2008 at 05:52:35PM +0900, Takashi Sato wrote:
> >> I think that your concern is that the freezer cannot recognize the occurrence
> >> of a timeout and it continues the backup process and the backup data is
> >> corrupted finally.
> > 
> > What timeout should happen?  the freeze ioctl must not return until the
> > filesystem is a clean state and all writes are blocked.
> 
> The suggestion was that *UN*freeze would return ETIMEDOUT if the
> filesystem had already unfrozen itself, I think.  That way you know that
> the snapshot you just took is worthless, at least.

But why would the filesystem every unfreeze itself?  That defeats the
whole point of freezing it.

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