linux-kernel - Re: [patch 1/1] PM: Adds remount fs ro at suspend

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Date:	Mon, 5 Feb 2007 21:35:30 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Nigel Cunningham <nigel@...el.suspend2.net>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Andrew Morton <akpm@...ux-foundation.org>, akuster@...sta.com,
	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [patch 1/1] PM: Adds remount fs ro at suspend

On Tue, Feb 06, 2007 at 08:28:33AM +1100, Nigel Cunningham wrote:
> Why do you think remounting filesystems is necessary? Are you getting
> problems with some particular filesystem?
> 
> If I recall correctly, we briefly tried remounting filesystems in
> Suspend2, but it created problems with logging - some files open r/w
> were readonly afterwards.

Yes, that's the biggest problem with the forced remount r/o hack -
FMODE_WRITE is dropped from all files, and can't be recovered.
(and at the same time in progress writes or writes through shared
mmaps are totally ignored).

> We then tried bdev freezing with much better success.

Yes, that's the right thing to do if you want to be safe, but
we already had that discussion..

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