linux-kernel - Re: [PATCH 02/10] block: fix genhd refcounting in blkio_policy_parse_and

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Message-ID: <CAPXgP12hvveG8y31Q77BQAzrdaeaux=Eoonu8RinGmP3DfTsbQ@mail.gmail.com>
Date:	Thu, 20 Oct 2011 18:16:04 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Vivek Goyal <vgoyal@...hat.com>, axboe@...nel.dk,
	linux-kernel@...r.kernel.org, ctalbott@...gle.com, rni@...gle.com,
	containers@...ts.linux-foundation.org
Subject: Re: [PATCH 02/10] block: fix genhd refcounting in blkio_policy_parse_and_set()

On Thu, Oct 20, 2011 at 18:11, Tejun Heo <tj@...nel.org> wrote:
> I think this is essentially a bug.  If you have something like "dev =
> find_and_get(); put(dev); return dev != NULL;", it's a pretty good
> indication something is pretty screwed there, so unless someone
> screams really loud, I think I'm gonna push for removal of the
> feature.

Matching on unpredictable dev_t inside the kernel or in userspace is a
serious bug. We can't do anything like that ever on a modern system,
these times are long over.

Yes, please get rid of this misguided logic, nobody should get the
impression that this can ever work.

Kay
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