linux-kernel - Re: [dm-devel] [PATCH 02/13] dm: kill dm_rq_bio

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Message-ID: <20120518164319.GJ29330@agk-dp.fab.redhat.com>
Date:	Fri, 18 May 2012 17:43:19 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	koverstreet@...gle.com, axboe@...nel.dk, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, agk@...hat.com,
	Junichi Nomura <j-nomura@...jp.nec.com>,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: [dm-devel] [PATCH 02/13] dm: kill dm_rq_bio_destructor

On Fri, May 18, 2012 at 08:57:29AM -0700, Tejun Heo wrote:
> Please explain why this is done and how it's safe.  Alasdair / dm
> folks, can you please ack this?
 
I think it's relying on there being never more than one reference on those 
bios so that that endio fn, called exactly once, always frees it and there
are no dm_puts elsewhere.

Alasdair

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