linux-kernel - Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

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Message-ID: <20070531233449.GT86004887@sgi.com>
Date:	Fri, 1 Jun 2007 09:34:49 +1000
From:	David Chinner <dgc@....com>
To:	Phillip Susi <psusi@....rr.com>
Cc:	David Chinner <dgc@....com>, Jens Axboe <jens.axboe@...cle.com>,
	david@...g.hm, Neil Brown <neilb@...e.de>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, linux-raid@...r.kernel.org,
	Stefan Bader <Stefan.Bader@...ibm.com>,
	Andreas Dilger <adilger@...sterfs.com>,
	Tejun Heo <htejun@...il.com>
Subject: Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

On Thu, May 31, 2007 at 02:31:21PM -0400, Phillip Susi wrote:
> David Chinner wrote:
> >That sounds like a good idea - we can leave the existing
> >WRITE_BARRIER behaviour unchanged and introduce a new WRITE_ORDERED
> >behaviour that only guarantees ordering. The filesystem can then
> >choose which to use where appropriate....
> 
> So what if you want a synchronous write, but DON'T care about the order? 

submit_bio(WRITE_SYNC, bio);

Already there, already used by XFS, JFS and direct I/O.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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