linux-kernel - Re: [dm-devel] [PATCH v2 08/14] block: Kill bi

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Date:	Thu, 24 May 2012 15:58:10 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	axboe@...nel.dk, yehuda@...newdream.net, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org, tj@...nel.org,
	linux-bcache@...r.kernel.org, mpatocka@...hat.com,
	bharrosh@...asas.com, linux-fsdevel@...r.kernel.org,
	sage@...dream.net, agk@...hat.com, drbd-dev@...ts.linbit.com
Subject: Re: [dm-devel] [PATCH v2 08/14] block: Kill bi_destructor

On Thu, May 24, 2012 at 03:52:02PM -0400, Vivek Goyal wrote:
> On Wed, May 23, 2012 at 05:02:45PM -0700, Kent Overstreet wrote:
> 
> [..]
> > @@ -234,6 +234,13 @@ void bio_free(struct bio *bio, struct bio_set *bs)
> >  {
> >  	void *p;
> >  
> > +	if (!bs) {
> > +		if (bio_integrity(bio))
> > +			bio_integrity_free(bio, fs_bio_set);
> > +		kfree(bio);
> > +		return;
> > +	}
> > +
> 
> Ok, this seems to be the code which will take care of freeing kmalloced
> bio. I think putting little comment about the explicit assumption is not
> a bad idea.
> 
> Somehow we need to integrate two patches so that we don't have memory leak
> in bisection and reading code becomes easier.
> 
> Also then what's the need of bio_reset() in previous patch. That seems to
> be independent from getting rid of pkt_bio_destructor(). I would think
> that keep we can split the patch and keep bio_reset() logic in a separate
> patch. In fact I am not even sure that for one driver we should introduce
> bio_reset() in generic block layer. So to me we should get rid of bio_reset()
> and let all the gory details remain in driver.

Just noticed bio_kmalloc_destructor() will take care of freeing bio_kmalloc()
bios and it has been dropped in this patch. So memory leak point is moot.
bio_reset() question still remains though.

Thanks
Vivek
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