linux-kernel - Re: [RFC][v7][PATCH 0/9] Implement clone2() system call

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Date:	Thu, 24 Sep 2009 21:57:20 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, Oren Laadan <orenl@...columbia.edu>,
	serue@...ibm.com, "Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Andrew Morton <akpm@...l.org>, torvalds@...ux-foundation.org,
	mikew@...gle.com, mingo@...e.hu, hpa@...or.com,
	Nathan Lynch <nathanl@...tin.ibm.com>, arnd@...db.de,
	peterz@...radead.org,
	Containers <containers@...ts.linux-foundation.org>,
	sukadev@...ibm.com
Subject: Re: [RFC][v7][PATCH 0/9] Implement clone2() system call

I don't like this even more.

Pid namespaces are hierarchical _and_ anonymous, so simply
set of numbers doesn't describe the final object.

struct pid isn't special, it's just another invariant if you like
as far as C/R is concerned, but system call is made special wrt pids.

What will be in an image? I hope "struct kstate_image_pid" with several
numbers and with references to such object from other places, so it
seems natural to do alloc_pid() with needed numbers and that attach new
shiny pid to where needed. But this clone_pid is only for task_struct's pids.
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