linux-kernel - Re: [PATCH 06/13] block: Add bio

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 18 May 2012 14:48:01 -0700
From:	Kent Overstreet <koverstreet@...gle.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, linux-fsdevel@...r.kernel.org,
	axboe@...nel.dk, agk@...hat.com, neilb@...e.de
Subject: Re: [PATCH 06/13] block: Add bio_reset()

On Fri, May 18, 2012 at 09:16:08AM -0700, Tejun Heo wrote:
> Hello,
> 
> On Thu, May 17, 2012 at 10:59:53PM -0400, koverstreet@...gle.com wrote:
> > From: Kent Overstreet <koverstreet@...gle.com>
> > 
> > Reusing bios is something that's been highly frowned upon in the past,
> > but driver code keeps doing it anyways. If it's going to happen anyways,
> > we should provide a generic method.
> > 
> > This'll help with getting rid of bi_destructor.
> 
> It would be nice to explain a bit why this helps bi_destructor
> removal.

drivers/block/pktcdvd.c was open coding this - it was doing a bio_init()
and then resetting bi_destructor (and other stuff). The generic
bio_reset() means it doesn't have to know about bi_destructor anymore.

> 
> > +#define BIO_RESET_OFFSET	offsetof(struct bio, bi_max_vecs)
> 
> Maybe better named BIO_RESET_BYTES?  As offset tends to indicate the
> start of a region.

Yeah, that's a better name.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/