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

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Message-Id: <1170710913.6105.39.camel@nigel.suspend2.net>
Date:	Tue, 06 Feb 2007 08:28:33 +1100
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	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

Hi.

On Fri, 2007-02-02 at 22:35 -0200, Henrique de Moraes Holschuh wrote:
> On Fri, 02 Feb 2007, Andrew Morton wrote:
> > Well the code appears simple enough, but I've not previously heard anyone
> > express a need for this feature.  But I know how to cc people who might
> > have heard this.
> 
> You are, now.
> 
> We usually try to do it in userspace (and it gets ugly when we fail).  If
> the kernel would do it, it would be very welcome.

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. We then tried bdev freezing with much better
success.

Regards,

Nigel

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