linux-kernel - Re: [PATCH]: xen/blkback: Add support for old BARRIER requests - 'feature-barrier', was "Help with implementing some form of barriers in 3.0 kernels."

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Date:	Thu, 15 Sep 2011 11:15:40 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jan Beulich <JBeulich@...e.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>, hch@...radead.org,
	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]: xen/blkback: Add support for old BARRIER requests -
 'feature-barrier', was "Help with implementing some form of barriers in 3.0
 kernels."

Btw, I'm really against exporting any of the low-level request/elevator
code interfaces.  I have plans for huge changes in that area, and having
someone poke into it is just a bad idea.

Try to take a look at the barrier era dm implementation of them, which
did the draining on the bio layer and copy & paste that.

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