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

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Date:	Thu, 31 May 2007 10:22:58 +1000
From:	Neil Brown <neilb@...e.de>
To:	Phillip Susi <psusi@....rr.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, linux-raid@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>,
	David Chinner <dgc@....com>,
	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 Tuesday May 29, psusi@....rr.com wrote:
> Neil Brown wrote:
> >  md/dm modules could keep count of requests as has been suggested
> >  (though that would be a fairly big change for raid0 as it currently
> >  doesn't know when a request completes - bi_endio goes directly to the
> >  filesystem). 
> 
> Are you sure?  I believe that dm handles bi_endio because it waits for 
> all in progress bio to complete before switching tables.

I was taking about md/raid0, not dm-stripe.
md/raid0 (and md/linear) currently never know that a request has
completed.

NeilBrown
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