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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Message-ID: <20110916092416.GA2003@phenom.oracle.com>
Date:	Fri, 16 Sep 2011 05:24:16 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Christoph Hellwig <hch@...radead.org>, Jan Kara <jack@...e.cz>
Cc:	Jan Kara <jack@...e.cz>, Jan Beulich <JBeulich@...e.com>,
	Jeremy Fitzhardinge <jeremy@...p.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."

On Thu, Sep 15, 2011 at 11:15:40AM -0400, Christoph Hellwig wrote:
> 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.

Thanks for the heads up.
> 
> 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.

Jan (K), do you want to poke at that and re-use the patch of yours which I
have been altering?
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