Date: Wed, 25 Mar 2009 22:01:08 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jeff Garzik <jeff@garzik.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Theodore Tso <tytso@mit.edu>, Ingo Molnar <mingo@elte.hu>,
       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 device flush via sync_blockdev() (was Re:
 Linux 2.6.29)
Message-ID: <20090325220108.582a1f88@lxorguk.ukuu.org.uk>
In-Reply-To: <20090325212923.GA5620@havoc.gtf.org>
References: <20090324132032.GK5814@mit.edu>
	<alpine.LFD.2.00.0903241053200.3032@localhost.localdomain>
	<20090324184549.GE32307@mit.edu>
	<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>
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> This is a simple step that would cover a lot of cases...  sync(2)
> calls sync_blockdev(), and many filesystems do as well via the generic
> filesystem helper file_fsync (fs/sync.c).

file_fsync probably needs to pass down more information so you can make
this a mount option. It's going to depend on the application whether the
flush is good bad or indifferent.
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