linux-kernel - Re: [Lsf10-pc] [LFS/VM TOPIC] Stable pages while IO (was Wrong DIF guard tag on ext2 write)

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Message-ID: <20100603163001.GF24994@fieldses.org>
Date:	Thu, 3 Jun 2010 12:30:01 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
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>,
	Vladislav Bolkhovitin <vst@...b.net>,
	Christoph Hellwig <hch@....de>
Subject: Re: [Lsf10-pc] [LFS/VM TOPIC] Stable pages while IO (was Wrong DIF
	guard tag on ext2 write)

On Thu, Jun 03, 2010 at 07:09:52PM +0300, Boaz Harrosh 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.

Yes, nfs/rpcsec_gss code is an example of code that tries to sign pages
containing data that could change underneath us.  I don't know if we've
seen it in practice.

--b.

> - DIF/DIX people
> - ...
> 
> 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
> _______________________________________________
> Lsf10-pc mailing list
> Lsf10-pc@...ts.linux-foundation.org
> https://lists.linux-foundation.org/mailman/listinfo/lsf10-pc
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