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

From: Alasdair G Kergon <agk redhat com>
To: device-mapper development <dm-devel redhat com>
Cc: Tejun Heo <htejun gmail com>, David Chinner <dgc sgi com>, linux-kernel vger kernel org, linux-raid vger kernel org, Jens Axboe <jens axboe oracle com>, linux-fsdevel vger kernel org, Andreas Dilger <adilger clusterfs com>
Subject: Re: [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
Date: Thu, 31 May 2007 01:57:37 +0100

On Thu, May 31, 2007 at 10:46:04AM +1000, Neil Brown wrote:
> What if the truth changes (as can happen with md or dm)?

You get notified in endio() that the barrier had to be emulated?
 
Alasdair
-- 
agk redhat com

References:
- [dm-devel] [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: Neil Brown
- [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: Neil Brown
- [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: David Chinner
- [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: Neil Brown
- [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: David Chinner
- [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: Neil Brown

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