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

From: David Chinner <dgc sgi com>
To: device-mapper development <dm-devel redhat com>, David Chinner <dgc sgi com>, Tejun Heo <htejun gmail 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>
Cc:
Subject: Re: [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
Date: Thu, 31 May 2007 11:11:27 +1000

On Thu, May 31, 2007 at 02:07:39AM +0100, Alasdair G Kergon wrote:
> On Thu, May 31, 2007 at 10:46:04AM +1000, Neil Brown wrote:
> > If a filesystem cares, it could 'ask' as suggested above.
> > What would be a good interface for asking?
> 
> XFS already tests:
>   bd_disk->queue->ordered == QUEUE_ORDERED_NONE

The side effects of removing that check is what started
this whole discussion.

Cheers,

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

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

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