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

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Message-ID: <20090924201517.GA24786@us.ibm.com>
Date:	Thu, 24 Sep 2009 13:15:17 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Oren Laadan <orenl@...rato.com>
Cc:	linux-kernel@...r.kernel.org, arnd@...db.de,
	Containers <containers@...ts.linux-foundation.org>,
	Nathan Lynch <nathanl@...tin.ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, hpa@...or.com,
	mingo@...e.hu, torvalds@...ux-foundation.org,
	Alexey Dobriyan <adobriyan@...il.com>,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [RFC][v7][PATCH 0/9] Implement clone2() system call

Oren Laadan [orenl@...rato.com] wrote:
| 
| 
| Sukadev Bhattiprolu wrote:
| > Based on these requirements and constraints, we explored a couple of system
| > call interfaces (in earlier versions of this patchset) and currently define
| > the system call as:
| > 
| > 	struct clone_struct {
| > 		u64 flags;
| > 		u64 child_stack;
| > 		u32 nr_pids;
| > 		u32 parent_tid;
| > 		u32 child_tid;
| 
| So @parent_tid and @child_tid are pointers to userspace memory and
| require 'u64' (and it won't hurt to make @reserved1 a 'u64' as well).

No, as Arnd pointed out, we already pass in a pointer to 'struct clone_struct'
and the kernel can use that pointer to copy the parent and child tids.

| 
| > 		u32 reserved1;
| > 		u64 reserved2;
| > 	};
| > 
| 
| Also, for forward/backward compatibility, explicitly state in the
| documentation, and enforce in the kernel, that flags which are not
| defined must not be set, and that reserved{1,2} must remain 0.

Good idea. Will do.

Thanks,

Sukadev
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