linux-kernel - Re: [PATCH v5 05/12] block: Kill bi

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Message-ID: <CAOS58YOHZmNWezg0uDhDeKP1dAt8fmmcLjmzKGShrw6PCpCFpg@mail.gmail.com>
Date:	Wed, 8 Aug 2012 23:34:09 -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 05/12] block: Kill bi_destructor

Hello,

On Wed, Aug 8, 2012 at 11:12 PM, Kent Overstreet <koverstreet@...gle.com> wrote:
> But if it's a pointer to heap allocated memory, but the bio was embedded
> in another struct? I've seen a fair number of instances of that (md, off
> the top of my head).
>
> If you're sure that in a normal config the slab allocator is going to
> complain right away and not corrupt itself, fine. But I've been bitten
> way too hard by bugs that could've been caught right away by a simple
> assert and instead I had to spend hours backtracking, and the block
> layer is _rife_ with that kind of thing.

Let's let slab debug code deal with that.  I really don't see much
benefit in doing this.  The said kind of bugs aren't particularly
difficult to track down.

Thanks.

-- 
tejun
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