linux-kernel - Re: [PATCH 1/7] block: Add block_flush

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Date:	Tue, 31 Mar 2009 12:37:38 -0400
From:	Mark Lord <lkml@....ca>
To:	Eric Sandeen <sandeen@...deen.net>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>, Jeff Garzik <jeff@...zik.org>,
	Christoph Hellwig <hch@...radead.org>,
	Theodore Tso <tytso@....edu>, 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>,
	chris.mason@...cle.com, david@...morbit.com, tj@...nel.org
Subject: Re: [PATCH 1/7] block: Add block_flush_device()

Eric Sandeen wrote:
> Mark Lord wrote:
..
>> XFS appears to have something along those lines.
>> I believe it tries to disable the drive write caches
>> if it discovers that it cannot do cache flushes.
> 
> No, it just stops issuing barriers if the initial mount-time test finds
> that they're not supported.  ext3/4/reiserfs do similar.
..

Okay.  My apologies to the XFS folks!

I'll have to dig deeper to find out who/what is disabling
the drive write caches, then.

Thanks
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