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

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Subject: Re: Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
From: Alasdair G Kergon <agk@xxxxxxxxxx>
Date: Wed, 30 May 2007 11:41:15 +0100
Cc: Tejun Heo <htejun@xxxxxxxxx>, Stefan Bader <sbader3@xxxxxxxxxxxxxx>, David Chinner <dgc@xxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx, Jens Axboe <jens.axboe@xxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, Andreas Dilger <adilger@xxxxxxxxxxxxx>
In-reply-to: <5201e28f0705300212g3be16464u5ee1a4c80db27a11@xxxxxxxxxxxxxx>
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References: <18006.38689.818186.221707@xxxxxxxxxxxxxx> <18010.12472.209452.148229@xxxxxxxxxxxxxx> <20070528094358.GM25091@xxxxxxxxxxxxxxxxxx> <5201e28f0705290225v14fdac44hb0382a4137a84d01@xxxxxxxxxxxxxx> <20070529220500.GA6513@xxxxxxxxxxxxxxxxxx> <5201e28f0705300212g3be16464u5ee1a4c80db27a11@xxxxxxxxxxxxxx>
Reply-to: device-mapper development <dm-devel@xxxxxxxxxx>
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On Wed, May 30, 2007 at 11:12:37AM +0200, Stefan Bader wrote:
> it might be better to indicate -EOPNOTSUPP right from
> device-mapper.

Indeed we should.  For support, on receipt of a barrier, dm core should
send a zero-length barrier to all active underlying paths, and delay
mapping any further I/O.

Alasdair
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References:
- [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: Neil Brown
- Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: Neil Brown
- Re: Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: Alasdair G Kergon
- Re: Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: Stefan Bader
- Re: Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: Alasdair G Kergon
- Re: Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
  - From: Stefan Bader

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