linux-kernel - Re: [RFC] block integrity: Fix write after checksum calculation problem

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Message-ID: <20110223202446.GG4020@noexit>
Date:	Wed, 23 Feb 2011 12:24:47 -0800
From:	Joel Becker <jlbec@...lplan.org>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	djwong@...ibm.com, Jens Axboe <axboe@...nel.dk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, Mingming Cao <mcao@...ibm.com>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [RFC] block integrity: Fix write after checksum calculation
 problem

On Tue, Feb 22, 2011 at 11:45:44AM -0500, Martin K. Petersen wrote:
> Also, DIX is only the tip of the iceberg. Many other impending
> technologies feature checksums and require pages to be stable during I/O
> due to checksumming, encryption and so on.
> 
> The VM is already trying to do the right thing. We just need the
> relevant filesystems to catch up.

	ocfs2 handles stable metadata for its checksums when feeding
things to the journal.  If we're doing pagecache-based I/O, is the
pagecache going to help here for data?
 
Joel

-- 

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			http://www.jlbec.org/
			jlbec@...lplan.org
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