Date: Mon, 27 Aug 2007 21:47:52 +0100
From: Al Viro <viro@ftp.linux.org.uk>
To: Robin Holt <holt@sgi.com>
Cc: Dean Nelson <dcn@sgi.com>, akpm@linux-foundation.org,
       linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, tony.luck@intel.com, jes@sgi.com
Subject: Re: [PATCH 1/4] export __put_task_struct for XPMEM
Message-ID: <20070827204752.GK21089@ftp.linux.org.uk>
References: <20070827155622.GA25589@sgi.com> <20070827155933.GB25589@sgi.com> <20070827161327.GG21089@ftp.linux.org.uk> <20070827181056.GA30176@sgi.com> <20070827181544.GH21089@ftp.linux.org.uk> <20070827191906.GB30176@sgi.com> <20070827193510.GJ21089@ftp.linux.org.uk> <20070827202420.GE22922@lnx-holt.americas.sgi.com>
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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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