linux-ext4 - Re: What happened to data=guarded?

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Date:	Mon, 10 Aug 2009 18:42:05 +0200
From:	Pavel Machek <pavel@....cz>
To:	Theodore Tso <tytso@....edu>, Andi Kleen <andi@...stfloor.org>,
	Frans Pop <elendil@...net.nl>,
	Chris Mason <chris.mason@...cle.com>, jack@...e.cz,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: What happened to data=guarded?

On Tue 2009-08-11 14:57:03, Theodore Tso wrote:
> On Tue, Aug 11, 2009 at 05:29:14PM +0200, Andi Kleen wrote:
> > > Good to hear. I've so far stayed with data=ordered as I think I'd prefer 
> > > data=guarded over data=writeback. I'll certainly give it a try when it's 
> > > available.
> > 
> > Same here. data=writeback already cost me a few files after crashes here :/
> 
> What sort of files were you losing?  I don't know if we can improve
> the implied flush hueristics, but we should at least try to see if we
> do something about it.

IIRC... the flush heuristics invoke async flush, so you can still lose
data if you are unlucky, no?
								Pavel

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