linux-kernel - 3.15 regression: wrong cgroup magic

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Date:	Mon, 2 Jun 2014 17:56:19 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: 3.15 regression: wrong cgroup magic

Sorry I didn't notice this earlier.  Linux 3.15 breaks my production
system :(  The cause appears to be:

commit 2bd59d48ebfb3df41ee56938946ca0dd30887312
Author: Tejun Heo <tj@...nel.org>
Date:   Tue Feb 11 11:52:49 2014 -0500

    cgroup: convert to kernfs

In particular, this piece:

-       sb->s_magic = CGROUP_SUPER_MAGIC;

The result is that cgroup shows up with the wrong magic number, so my
code goes "oh crap, cgroupfs isn't mounted" and fails.

I can change my code to hack around this, but I can imagine other
things getting tripped up.  Is there still time to fix this?

--Andy
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