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

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Date:	Mon, 17 Aug 2015 16:02:54 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.com>,
	Eryu Guan <eguan@...hat.com>, xfs@....sgi.com, axboe@...com,
	Dave Chinner <david@...morbit.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...com
Subject: Re: [PATCH block/for-linus] writeback: fix syncing of I_DIRTY_TIME
 inodes

Hello, Jan.

On Fri, Aug 14, 2015 at 01:14:09PM +0200, Jan Kara wrote:
> So the patch looks good to me. But the fact that is fixes Eryu's problem
> means there is something fishy going on. Either inodes get wrongly attached

Seriously, it shouldn't affect size syncing or xfs but then again my
understanding of xfs is severely limited.

> to b_dirty_time list or bdi_has_dirty_io() somehow misbehaves only
> temporarily and we don't catch it with the debug patch.
> 
> Can we add a test to wb_has_dirty_io() to also check whether it matches
> bdi_has_dirty_io()? Since Eryu doesn't use lazytime (I assume, Eryu, please
> speak up if you do), we could also warn if b_dirty_time lists get
> non-empty. Hmm?

Sure, will prep a patch soon.

Thanks.

-- 
tejun
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