linux-kernel - Re: [RFC 1/5] user namespaces: Add a user_namespace as creator/owner of uts

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Message-ID: <m1ipysm8us.fsf@fess.ebiederm.org>
Date:	Fri, 17 Dec 2010 12:40:11 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Greg KH <greg@...ah.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	LSM <linux-security-module@...r.kernel.org>,
	James Morris <jmorris@...ei.org>,
	Kees Cook <kees.cook@...onical.com>,
	containers@...ts.linux-foundation.org,
	kernel list <linux-kernel@...r.kernel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Michael Kerrisk <michael.kerrisk@...il.com>
Subject: Re: [RFC 1/5] user namespaces: Add a user_namespace as creator/owner of uts_namespace

Greg KH <greg@...ah.com> writes:

>> There are also major benefits to have the version of something that is
>> never freed never going away, because it means you can just reference it
>> in code.  So while I would be happy to say this is special don't use a
>> kref and roll the reference counting logic by hand, we aren't
>> dynamically allocating init_uts_ns any time soon.
>
> Why have a reference count at all if it's not needed or used here?

We have to reference count every other uts namespace.

Eric
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