linux-kernel - Re: [PATCH 00/30] C/R OpenVZ/Virtuozzo style

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Date:	Mon, 13 Apr 2009 04:16:32 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	xemul@...allels.com, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, hch@...radead.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	mingo@...e.hu
Subject: Re: [PATCH 00/30] C/R OpenVZ/Virtuozzo style

On Mon, 2009-04-13 at 13:14 +0400, Alexey Dobriyan wrote:
> [1] Do I inderstand correctly that cookie for shared object is an
> address on kernel stack? This is obviously unreliable, if yes :-)
> 
>         int objref;
>                 ...
>         /* adding 'file' to the hash will keep a reference to it */
>         new = cr_obj_add_ptr(ctx, file, &objref, CR_OBJ_FILE, 0);

No, that's just Oren's way to get two return variables.

He needs 'new' to figure out whether to write out the full file or just
an objref record.  He also needs 'objref' itself in case of writing
either.  cr_obj_add_ptr() modifies objref.

-- Dave

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