linux-ext4 - Re: [RFC] ext3 freeze feature

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Message-Id: <01cb01c861af$8515d230$41a8400a@bsd.tnes.nec.co.jp>
Date:	Mon, 28 Jan 2008 22:13:05 +0900
From:	"Takashi Sato" <t-sato@...jp.nec.com>
To:	"Theodore Tso" <tytso@....EDU>
Cc:	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-ext4@...r.kernel.org>
Subject: Re: [RFC] ext3 freeze feature

Hi,

> What you *could* do is to start putting processes to sleep if they
> attempt to write to the frozen filesystem, and then detect the
> deadlock case where the process holding the file descriptor used to
> freeze the filesystem gets frozen because it attempted to write to the
> filesystem --- at which point it gets some kind of signal (which
> defaults to killing the process), and the filesystem is unfrozen and
> as part of the unfreeze you wake up all of the processes that were put
> to sleep for touching the frozen filesystem.

I don't think close() usually writes to journal and the deadlock occurs.
Is there the special case which close() writes to journal in case of
getting signal?

Cheers, Takashi 

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