linux-ext4 - Re: [PATCHSET v3.1 0/7] data integrity: Stabilize pages during writeback for various fses

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Date:	Tue, 10 May 2011 12:24:50 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Jan Kara <jack@...e.cz>
Cc:	"Darrick J. Wong" <djwong@...ibm.com>,
	Theodore Tso <tytso@....edu>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Jens Axboe <axboe@...nel.dk>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jeff Layton <jlayton@...hat.com>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-mm <linux-mm@...ck.org>, Joel Becker <jlbec@...lplan.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	Mingming Cao <mcao@...ibm.com>
Subject: Re: [PATCHSET v3.1 0/7] data integrity: Stabilize pages during writeback for various fses

Excerpts from Jan Kara's message of 2011-05-10 08:51:24 -0400:
> On Mon 09-05-11 16:03:18, Darrick J. Wong wrote:
> > I am still chasing down what exactly is broken in ext3.  data=writeback mode
> > passes with no failures.  data=ordered, however, does not pass; my current
> > suspicion is that jbd is calling submit_bh on data buffers but doesn't call
> > page_mkclean to kick the userspace programs off the page before writing it.
>   Yes, ext3 in data=ordered mode writes pages from
> journal_commit_transaction() via submit_bh() without clearing page dirty
> bits thus page_mkclean() is not called for these pages. Frankly, do you
> really want to bother with adding support for ext2 and ext3? People can use
> ext4 as a fs driver when they want to start using blk-integrity support.
> Especially ext2 patch looks really painful and just from a quick look I can
> see code e.g. in fs/ext2/namei.c which isn't handled by your patch yet.

I think ext23 are going to be pretty big changes, we're best off just
going with ext4.

-chris
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