linux-kernel - Re: [RFC] [PATCH] A clean aEvgeniy pproach to writeout throttling

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 for Android: free password hash cracker in your pocket

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

Date:	Mon, 10 Dec 2007 03:23:48 -0800
From:	Daniel Phillips <phillips@...nq.net>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC] [PATCH] A clean aEvgeniy pproach to writeout throttling

On Monday 10 December 2007 02:47, Jens Axboe wrote:
> Ehm, this patch is so broken it's not even funny - did you even
> compile? You would have noticed the warning on request_queue_t,
> surely. The big problem is the last hunk here though, how would that
> work on stacked devices? Clue: ->bi_bdev is not const, it can change
> after a call to ->make_request_fn().

Such paranoia.  Yes, the patch was compiled.   Yes, the warning was 
slipped through.  No, it is not substantive, and in fact was removed 
from another branch of our tree already.

Ignoring the rhetoric, apparently you missed the line:

+       if (q && q->metric && !bio->bi_queue) {

The prevents any reference ti bi_bdev after the intial call to 
generic_make_request.  Thanks to Evgeniy for pointing out the need for 
this measure on the last go round.

"So broken" is a gross exaggeration.  Substantive comments welcome.

Daniel
--
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/