[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20091108082905.GA25494@discord.disaster>
Date: Sun, 8 Nov 2009 19:29:05 +1100
From: Dave Chinner <david@...morbit.com>
To: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Christoph Hellwig <hch@...radead.org>,
Daniel Pittman <daniel@...space.net>,
Henrique de Moraes Holschuh <hmh@....eng.br>,
"Rafael J. Wysocki" <rjw@...k.pl>,
linux-pm@...ts.linux-foundation.org,
Maxim Levitsky <maximlevitsky@...il.com>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] Massive ext4 filesystem corruption after a failed
s2disk/ram cycle
On Wed, Nov 04, 2009 at 11:18:05AM +0900, KOSAKI Motohiro wrote:
> > On Wed, Oct 07, 2009 at 01:14:10PM +1100, Daniel Pittman wrote:
> > > For what it is worth, I would also be quite interested to know
> > > /why/ XFS is bad in this regard. Is it just the previously
> > > stated "XFS writes to disk despite freezing kernel threads"
> > > issue, or something deeper?
> >
> > sync pushes out all data to disk, but in a journaling filesystem
> > that might just but the log not the "normal" place on disk. For
> > a boot loader to deal with it properly it actually needs to do
> > an replay of the log. Grub does so for reiserfs but not for XFS
> > for some reason. I don't know why problems don't trigger more
> > often with ext3, though.
>
> I'm sorry for the long delayed and offtopic responce. I discussed
> this issue with okuji-san (GRUB2 maintainer) at several month ago.
> He really wish linux implement real sync.
>
> A bootloader has much constraint than OS (mainly caused by size
> constraint). it can't implemnt jornal log replay logic for _all_
> filesystem. Why can't we implement storong sync syscall? I don't
> think this is PM nor bootloader fault.
We already have an ioctl that does what you want: FIFREEZE.
Cheers,
Dave.
--
Dave Chinner
david@...morbit.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists