linux-kernel - Re: [PATCH] Make /proc/net a symlink on /proc/self/net (v2)

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Message-ID: <20080306122440.GA28561@infradead.org>
Date:	Thu, 6 Mar 2008 07:24:40 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Netdev List <netdev@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] Make /proc/net a symlink on /proc/self/net (v2)

On Thu, Mar 06, 2008 at 12:18:02PM +0300, Pavel Emelyanov wrote:
> Current /proc/net is done with so called "shadows", but current
> implementation is broken and has little chances to get fixed.
> 
> The problem is that dentries subtree of /proc/net directory has
> fancy revalidation rules to make processes living in different
> net namespaces see different entries in /proc/net subtree, but
> currently, tasks see in the /proc/net subdir the contents of any
> other namespace, depending on who opened the file first.
> 
> The proposed fix is to turn /proc/net into a symlink, which points
> to /proc/self/net, which in turn shows what previously was in
> /proc/net - the network-related info, from the net namespace the
> appropriate task lives in.

Yes, that's a much better way to get this functionality.

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