linux-kernel - Re: [PATCH v5 01/12] block: Generalized bio pool freeing

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Date:	Wed, 8 Aug 2012 15:25:15 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, axboe@...nel.dk, agk@...hat.com,
	neilb@...e.de, drbd-dev@...ts.linbit.com, vgoyal@...hat.com,
	mpatocka@...hat.com, sage@...dream.net, yehuda@...newdream.net
Subject: Re: [PATCH v5 01/12] block: Generalized bio pool freeing

On Mon, Aug 06, 2012 at 03:08:30PM -0700, Kent Overstreet wrote:
> @@ -422,7 +409,11 @@ void bio_put(struct bio *bio)
>  	if (atomic_dec_and_test(&bio->bi_cnt)) {
>  		bio_disassociate_task(bio);
>  		bio->bi_next = NULL;
> -		bio->bi_destructor(bio);
> +
> +		if (bio->bi_pool)
> +			bio_free(bio, bio->bi_pool);
> +		else
> +			bio->bi_destructor(bio);

So, this bi_pool overriding caller specified custom bi_destructor is
rather unusual.  I know why it's like that - the patch series is
gradually replacing bi_destructor with bi_pool and removes
bi_destructor eventually, but it would be far better if at least patch
description says why this is unusual like this.

Thanks.

-- 
tejun
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