linux-kernel - Re: [PATCH 3/5] dm: relax ordering of bio-based flush implementation

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Message-ID: <4C7E5BA9.7020509@kernel.org>
Date:	Wed, 01 Sep 2010 15:56:57 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Mike Snitzer <snitzer@...hat.com>
CC:	jaxboe@...ionio.com, k-ueda@...jp.nec.com, j-nomura@...jp.nec.com,
	jamie@...reable.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-raid@...r.kernel.org,
	hch@....de, dm-devel@...hat.com
Subject: Re: [PATCH 3/5] dm: relax ordering of bio-based flush implementation

On 09/01/2010 03:51 PM, Mike Snitzer wrote:
> Could you please document why it is OK to remove 'flush_error' in the
> patch header?  The -EOPNOTSUPP handling removal (done in patch 2)
> obviously helps enable this but it is not clear how the
> 'num_flush_requests' flushes that __clone_and_map_flush() generates do
> not need explicit DM error handling.

Sure, I'll.  It's because it now uses the same error handling path in
dec_pending() all other bio's use.  The flush_error thing was there
because flushes got executed/completed in a separate code path to
begin with.  With the special path gone, there's no need for
flush_error path either.

Thanks.

-- 
tejun
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