linux-kernel - Re: [PATCH] autofs: fix the wrong usage of the deprecated task_pgrp

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Message-ID: <20090119221130.GB25598@us.ibm.com>
Date:	Mon, 19 Jan 2009 16:11:30 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ian Kent <raven@...maw.net>,
	Andrew Morton <akpm@...ux-foundation.org>, hpa@...or.com,
	Pavel Emelyanov <xemul@...nvz.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] autofs: fix the wrong usage of the deprecated
	task_pgrp_nr()

Quoting Oleg Nesterov (oleg@...hat.com):
> On 01/19, Serge E. Hallyn wrote:
> >
> > Quoting Oleg Nesterov (oleg@...hat.com):
> > > 
> > > This is the next patch. This one does
> > > 
> > > 	--- CUR/fs/autofs/inode.c~1_AUTOFS	2009-01-12 23:07:46.000000000 +0100
> > > 	+++ CUR/fs/autofs/inode.c	2009-01-18 06:18:49.000000000 +0100
> > > 	@@ -78,7 +78,7 @@ static int parse_options(char *options, 
> > > 	 
> > > 		*uid = current_uid();
> > > 		*gid = current_gid();
> > > 	-	*pgrp = task_pgrp_nr(current);
> > > 	+	*pgrp = task_pgrp_vnr(current);
> > 
> > Ok, that was the one I had looked at earlier (though now I can't find
> > it).  But that just seems wrong to me.  We should certainly not be
> > caching a pid_vnr in the kernel.  That is imo incomparably worse than
> > storing a pid_nr.
> 
> We do not cache it. We use this pgrp as an argument for find_pid()
> right after return from parse_options(). And find_pid() uses
> current->nsproxy->pid_ns. That is why this is bugfix.

So it does.  And so it is.

thanks,
-serge
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