linux-kernel - Re: [PATCH block/for-linus] writeback: fix syncing of I_DIRTY

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Message-ID: <20150824171144.GB27262@mtj.duckdns.org>
Date:	Mon, 24 Aug 2015 13:11:44 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Dave Chinner <david@...morbit.com>, Eryu Guan <eguan@...hat.com>,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	xfs@....sgi.com, axboe@...com, Jan Kara <jack@...e.com>,
	linux-fsdevel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH block/for-linus] writeback: fix syncing of I_DIRTY_TIME
 inodes

Hello,

On Mon, Aug 24, 2015 at 10:51:50AM -0400, Tejun Heo wrote:
> > Bah, I see the problem and indeed it was introduced by commit e79729123f639
> > "writeback: don't issue wb_writeback_work if clean". The problem is that
> > we bail out of sync_inodes_sb() if there is no dirty IO. Which is wrong
> > because we have to wait for any outstanding IO (i.e. call wait_sb_inodes())
> > regardless of dirty state! And that also explains why Tejun's patch fixes
> > the problem because it backs out the change to the exit condition in
> > sync_inodes_sb().
> 
> Dang, I'm an idiot sandwich.

A question tho, so this means that an inode may contain dirty or
writeback pages w/o the inode being on one of the dirty lists.
Looking at the generic filesystem and writeback code, this doesn't
seem true in general.  Is this something xfs specific?

Thanks.

-- 
tejun
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