linux-kernel - Re: [PATCH 1/4] export __put_task

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Message-ID: <20070827204752.GK21089@ftp.linux.org.uk>
Date:	Mon, 27 Aug 2007 21:47:52 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Robin Holt <holt@....com>
Cc:	Dean Nelson <dcn@....com>, akpm@...ux-foundation.org,
	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, tony.luck@...el.com, jes@....com
Subject: Re: [PATCH 1/4] export __put_task_struct for XPMEM

On Mon, Aug 27, 2007 at 03:24:20PM -0500, Robin Holt wrote:
> On Mon, Aug 27, 2007 at 08:35:10PM +0100, Al Viro wrote:
> > On Mon, Aug 27, 2007 at 02:19:06PM -0500, Dean Nelson wrote:
> > 
> > > No operations can be done once it's closed, only while it's opened.
> > 
> > What the hell do you mean, can't be done?
> > 
> > 	fd = open(...);
> > 	fp = popen("/bin/date", "r");
> > 	/* read from fp */
> > 	fclose(fp);
> 
> But this will operate on the dup'd fd.  We detect that in the flush
> (ignore) and ioctl (return errors) operations.  All other operations
> are not handled by xpmem.

How the hell do you detect dup'd fd?  It's identical to the original
in every respect and it doesn't have to be held by a different task.
Seriously, what you are proposing makes no sense whatsoever...
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