linux-kernel - Re: [LFS/VM TOPIC] Stable pages while IO (was Wrong DIF guard tag on ext2 write)

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Message-ID: <4C07E960.2040303@vlnb.net>
Date:	Thu, 03 Jun 2010 21:41:52 +0400
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	Boaz Harrosh <bharrosh@...asas.com>
CC:	Christof Schmitt <christof.schmitt@...ibm.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, lsf10-pc@...ts.linuxfoundation.org,
	Nick Piggin <npiggin@...e.de>,
	Al Viro <viro@...IV.linux.org.uk>,
	Chris Mason <chris.mason@...cle.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Ric Wheeler <rwheeler@...hat.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Christoph Hellwig <hch@....de>
Subject: Re: [LFS/VM TOPIC] Stable pages while IO (was Wrong DIF guard tag
 on ext2 write)

Boaz Harrosh, on 06/03/2010 08:09 PM wrote:
> [Topic]
> How to not let pages change while in IO
> 
> [Abstract]
> As seen in a long thread on the fsdvel scsi mailing lists. Lots of
> people have headaches and sleep less nights because individual pages
> can change while in IO and/or DMA. Though each one as slightly different
> needs, the mechanics look to be the same.
> 
> People that care:
> - Mirror and RAID people that need on disk consistency.
> - Network storage that wants data checksum.
> - DIF/DIX people

  - Load balancing MPIO clusters, where out of order execution of 
overlapping write requests for the changed pages can introduce a data 
corruption, which makes using Linux with load balancing MPIO clusters 
unsafe.

> - ...
> 
> I for one know nothing of the subject but am a RAID person and would
> like a solution that does not force me to copy the complete data load.
> 
> Please lets get all the VM VFS and drivers people in one room and see
> if we can have a Linux solution to this problem
> 
> Boaz
> --
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