linux-kernel - Re: [PATCH 2/7] ext3: call blkdev_issue

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Date:	Tue, 31 Mar 2009 13:18:18 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Theodore Tso <tytso@....edu>, Chris Mason <chris.mason@...cle.com>,
	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>, Jeff Garzik <jeff@...zik.org>,
	Christoph Hellwig <hch@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>, David Rees <drees76@...il.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	david@...morbit.com
Subject: Re: [PATCH 2/7] ext3: call blkdev_issue_flush() on fsync()

On Tue, Mar 31 2009, Tejun Heo wrote:
> Hello,
> 
> Theodore Tso wrote:
> > On Mon, Mar 30, 2009 at 10:15:51AM -0400, Chris Mason wrote:
> >> I'm not sure we want to stick Fernando with changing how barriers are
> >> done in individual filesystems, his patch is just changing the existing
> >> call points.
> > 
> > Well, his patch actually added some calls to block_issue_flush().  But
> > yes, it's probably better if he just changes the existing call points,
> > and we can have the relevant filesystem maintainers double check to
> > make sure that there aren't any new call points which are needed.
> 
> How about having something like blk_ensure_cache_flushed() which
> issues flush iff there hasn't been any write since the last flush?
> It'll be easy to implement and will filter out duplicate flushes in
> most cases.

My original ide implementation of flushes actually did this. My memory
is a little hazy on why it was dropped, I'm guessing because it
basically never triggered anyway.

-- 
Jens Axboe

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