linux-kernel - Re: [RFC v2] block integrity: Stabilize(?) pages during writeback

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Message-ID: <20110422203434.GA2977@quack.suse.cz>
Date:	Fri, 22 Apr 2011 22:34:34 +0200
From:	Jan Kara <jack@...e.cz>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	djwong <djwong@...ibm.com>, Mingming Cao <cmm@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jeff Layton <jlayton@...hat.com>, Jan Kara <jack@...e.cz>,
	Dave Chinner <david@...morbit.com>,
	Joel Becker <jlbec@...lplan.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jens Axboe <axboe@...nel.dk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Mingming Cao <mcao@...ibm.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: Re: [RFC v2] block integrity: Stabilize(?) pages during writeback

On Fri 22-04-11 08:50:01, Chris Mason wrote:
> Excerpts from Darrick J. Wong's message of 2011-04-21 20:02:26 -0400:
> > Hi everyone,
> > 
> > I've finally managed to get together a patch that seems to provide stable pages
> > during writeback, or at least gets us to the point that after several days of
> > running tests I don't see DIF checksum errors anymore. :)
> > 
> > The last two pieces to go into this puzzle were (a) bio_integrity_prep needs to
> > walk the process tree to find all userland ptes that map to a particular memory
> > page and revoke write access, and
> 
> Hmm, did you need the bio_integrity_prep change for all the filesystems?
> This should be happening already as part of using page_mkwrite.
  Or more precisely page_mkclean() should do what you try to do in
bio_integrity_prep()... It would certainly be interesting (bug) if you
could write to the page after calling page_mkclean() without page_mkwrite()
being called.

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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