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Date: Mon, 30 Mar 2009 10:25:40 +0900
From: =?ISO-8859-1?Q?Fernando_Luis_V=E1zquez_Cao?= 
	<fernando@oss.ntt.co.jp>
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To: Christoph Hellwig <hch@infradead.org>
CC: Jeff Garzik <jeff@garzik.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Theodore Tso <tytso@mit.edu>, Ingo Molnar <mingo@elte.hu>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Arjan van de Ven <arjan@infradead.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>, Nick Piggin <npiggin@suse.de>,
       David Rees <drees76@gmail.com>, Jesper Krogh <jesper@krogh.cc>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] issue storage dev flush from generic file_fsync helper
References: <alpine.LFD.2.00.0903241218130.3032@localhost.localdomain> <49C93AB0.6070300@garzik.org> <20090325093913.GJ27476@kernel.dk> <49CA86BD.6060205@garzik.org> <20090325194341.GB27476@kernel.dk> <49CA9346.6040108@garzik.org> <alpine.LFD.2.00.0903251337410.3032@localhost.localdomain> <20090325212923.GA5620@havoc.gtf.org> <20090326032445.GA16999@havoc.gtf.org> <20090327205046.GA2036@havoc.gtf.org> <20090329082507.GA4242@infradead.org>
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Christoph Hellwig wrote:
> Looks good except that we still need a tuning know for it.  Preferably
> one that works for these filesystems and all the existing barrier using
> ones.

Christoph, I reworked my previous fsync() patches so that what was a 
mount option to trigger a storage device writeback cache flush becomes a 
sysfs knob.

I still need to add support for automatic detection of underlying 
device's flushing capabilities but first I would like to know if you 
agree with the general approach.

I'll be replying to this email with the new patches.

- Fernando