linux-kernel - Re: Device loses barrier support (was: Fixed patch for simple barriers.)

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Date:	Thu, 4 Dec 2008 12:53:07 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	Andi Kleen <andi-suse@...stfloor.org>,
	linux-kernel@...r.kernel.org, xfs@....sgi.com,
	Alasdair G Kergon <agk@...hat.com>,
	Milan Broz <mbroz@...hat.com>
Subject: Re: Device loses barrier support (was: Fixed patch for simple
	barriers.)

On Thu, Dec 04, 2008 at 06:48:38PM +0100, Andi Kleen wrote:
> I think. Just the low level xfs_buf interface happens to use the asynchronous
> callbacks instead of calling into the block layer directly like jbd et.al.
> do.

Only delwri buffers are delayed in XFS, but the journaling code only
uses async buffers which *synchronously* call into the block layer, but
just don't wait for it to complete..

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