linux-kernel - Re: [PATCH 2.6.19 5/5] fs: freeze

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Message-ID: <20061108180921.GA7708@ucw.cz>
Date:	Wed, 8 Nov 2006 18:09:22 +0000
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Alasdair G Kergon <agk@...hat.com>,
	Eric Sandeen <sandeen@...hat.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, Srinivasa DS <srinivasa@...ibm.com>,
	Nigel Cunningham <nigel@...pend2.net>
Subject: Re: [PATCH 2.6.19 5/5] fs: freeze_bdev with semaphore not mutex

Hi!

> > swsusp-freeze-filesystems-during-suspend-rev-2.patch
> > 
> > I think you need to give more thought to device-mapper
> > interactions here.  If an underlying device is suspended
> > by device-mapper without freezing the filesystem (the
> > normal state) and you issue a freeze_bdev on a device
> > above it, the freeze_bdev may never return if it attempts
> > any synchronous I/O (as it should).
> 
> Well, it looks like the interactions with dm add quite a bit of
> complexity here.

What about just fixing xfs (thou shall not write to disk when kernel
threads are frozen), and getting rid of blockdev freezing?

						Pavel
-- 
Thanks for all the (sleeping) penguins.
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