linux-kernel - Re: [linux-pm] Re: [linux-lvm] 2.6.22-rc4 XFS fails after hibernate/resume

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Message-ID: <20070628220045.GA4521@elf.ucw.cz>
Date:	Fri, 29 Jun 2007 00:00:45 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	David Chinner <dgc@....com>, linux-pm <linux-pm@...ts.osdl.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	xfs@....sgi.com, LinuxRaid <linux-raid@...r.kernel.org>,
	LVM general discussion and development 
	<linux-lvm@...hat.com>, David Robinson <zxvdr.au@...il.com>,
	David Greaves <david@...eaves.com>
Subject: Re: [linux-pm] Re: [linux-lvm] 2.6.22-rc4 XFS fails after hibernate/resume

On Thu 2007-06-28 17:27:34, Rafael J. Wysocki wrote:
> On Wednesday, 27 June 2007 22:49, Pavel Machek wrote:
> > Hi!
> > 
> > > FWIW, I'm on record stating that "sync" is not sufficient to quiesce an XFS
> > > filesystem for a suspend/resume to work safely and have argued that the only
> > 
> > Hmm, so XFS writes to disk even when its threads are frozen?
> > 
> > > safe thing to do is freeze the filesystem before suspend and thaw it after
> > > resume. This is why I originally asked you to test that with the other problem
> > 
> > Could you add that to the XFS threads if it is really required? They
> > do know that they are being frozen for suspend.
> 
> Well, do you remember the workqueues?  They are still nonfreezable.

Oops, that would explain it :-(. Can we make XFS stop using them?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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