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

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Message-ID: <20081009101809.GA1319@infradead.org>
Date:	Thu, 9 Oct 2008 06:18:09 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Takashi Sato <t-sato@...jp.nec.com>
Cc:	Eric Sandeen <sandeen@...deen.net>,
	Christoph Hellwig <hch@...radead.org>,
	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 Thu, Oct 09, 2008 at 07:12:17PM +0900, Takashi Sato wrote:
> I think we need the timeout for the case someone dirties so much data
> with mmap, hence the freeze process is swapped out and cannot unfreeze.

That is not supposed to happen.  That's why write blocks early on a
frozen filesystem (the shared mmap write path is currently missing the
check, but that's a rather small patch)

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