linux-kernel - Re: [PATCH 00/10] sysfs tagged directories

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Date:	Wed, 30 Apr 2008 20:13:41 -0700
From:	Greg KH <gregkh@...e.de>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Benjamin Thery <benjamin.thery@...l.net>,
	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Tejun Heo <htejun@...il.com>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>, netdev@...r.kernel.org
Subject: Re: [PATCH 00/10] sysfs tagged directories

On Tue, Apr 29, 2008 at 02:34:17PM -0500, Serge E. Hallyn wrote:
> Finally, to give an idea about how the trees end up looking, here is
> what I just did on my test box;
> 
> /usr/sbin/ip link add type veth
> mount --bind /mnt /mnt
> mkdir /mnt/sys
> mount --make-shared /mnt
> ns_exec -cmn /bin/sh  # unshare netns and mounts ns
>  # At this point, I still see eth0 and friends under /sys/class/net etc
> mount -t sysfs none /sys
>  # At this point, /sys/class/net has only lo0 and sit0, and
>  # /sys/devices/pci0000:00/0000:00:03.0/net:eth0 is a dead link
> mount --bind /sys /mnt/sys
> echo $$
> 	3050
> 
> (back in another shell):
> /usr/sbin/ip link set veth1 netns 3050
> 
> (back in container shell):
> /usr/sbin/ip link set veth1 name eth0
>  # Now /sys/devices/pci0000:00/0000:00:03.0/net:eth0 is a live link to
>  # the /sys/class/net/eth0 which is really the original veth1
> exit
> 
> ls /mnt/sys/class/net
>  # empty directory

What does this all look like without CONFIG_SYSFS_DEPRECATED enabled,
which is what all sane distros do these days.  That's going to change
the look of the tree for stuff like this a lot I think...

thanks,

greg k-h
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