linux-kernel - Re: [PATCHSET block#for-2.6.36-post] block: replace barrier with sequenced flush

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Date:	Wed, 18 Aug 2010 11:46:20 +0200
From:	Christoph Hellwig <hch@....de>
To:	Tejun Heo <tj@...nel.org>
Cc:	jaxboe@...ionio.com, linux-fsdevel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	hch@....de, James.Bottomley@...e.de, tytso@....edu,
	chris.mason@...cle.com, swhiteho@...hat.com,
	konishi.ryusuke@....ntt.co.jp, dm-devel@...hat.com, vst@...b.net,
	jack@...e.cz, rwheeler@...hat.com, hare@...e.de
Subject: Re: [PATCHSET block#for-2.6.36-post] block: replace barrier with sequenced flush

FYI: One issue with this series is that make_request based drivers
not have to access all REQ_FLUSH and REQ_FUA requests.  We'll either
need to add handling to empty REQ_FLUSH requests to all of them or
figure out a way to prevent them getting sent.  That is assuming they'll
simply ignore REQ_FLUSH/REQ_FUA on normal writes.

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