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Date:	Wed, 14 May 2008 17:07:15 +0200
From:	Benjamin Thery <benjamin.thery@...l.net>
To:	Greg KH <gregkh@...e.de>
Cc:	Daniel Lezcano <dlezcano@...ibm.com>, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Tejun Heo <htejun@...il.com>, Al Viro <viro@....linux.org.uk>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>, netdev@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RESEND][PATCH 00/11] sysfs tagged directories

So, what is the status for this patchset?

So far, we discussed patch 10 a bit and Eric found a better way to fix
the kobject_rename() issue. But there hasn't been much discussion on the
rest of the patchset this time.

Does this mean that there is no strong objection against it now?
Do you think the approach is suitable for what we're aiming to?

Reminder: We need this for network namespaces. Without it network
namespaces testing is still a bit complicated in 2.6.26 (need to disable
sysfs). Also, Serge uses it too for user namespaces.

Should I resend it one more time ported on top of a more recent tree in
the hope it can be merged?
BTW which tree is the best? Linus', Greg's, -mm?

Regards,
Benjamin

Daniel Lezcano wrote:
> Greg KH wrote:
>> On Tue, May 06, 2008 at 07:30:30PM +0200, Benjamin Thery wrote:
>>> This is still the same port of Eric Biederman's patchset to implement
>>> tagged directories in sysfs that was discussed a few days ago.
>>>
>>> This time it applies on top of 2.6.26-rc1, which includes a fix from 
>>> Daniel Lezcano to fix net device renaming
>>> for sysfs (and of course all the network namespaces stuff that was 
>>> committed in net-2.6.26).
>>>
>>> This patchset still contains the patch from Serge Hallyn that implements
>>> tagging for user namespaces.
>>>
>>> It also contains a patch from Daniel Lezcano which allows to have net 
>>> devices with the same name in two different network namespaces.
>>
>> Does this all work properly with both CONFIG_SYSFS_DEPRECATED enabled
>> and disabled?
>>
>> Can you show some outputs of 'tree' in both cases on the /sys/class/net/
>> directory?
>>
>> thanks,
>>
>> greg k-h
> 
> Here is the output from an ls -l of /sys/class/net. I tryed with 
> different configurations and checked the renamed network devices are 
> propagated to the sysfs.
> 
> 1) CONFIG_SYSFS_DEPRECATED && CONFIG_SYS && CONFIG_NET_NS
> =========================================================
> 
> Outside a namespace:
> --------------------
> 
> qemu:~> ip l
> 1: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
>     link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
> 3: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop
>     link/ether 1e:43:9e:1f:1f:55 brd ff:ff:ff:ff:ff:ff
> 4: br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
>     link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
> 16: veth1: <BROADCAST,MULTICAST,PROMISC> mtu 1500 qdisc pfifo_fast qlen 
> 1000
>     link/ether 8e:94:e6:72:63:cf brd ff:ff:ff:ff:ff:ff
> 
> qemu:~/lxc> ll /sys/class/net/
> total 0
> drwxr-xr-x 5 root root 0 2008-05-07 15:24 br0
> drwxr-xr-x 3 root root 0 2008-05-07 13:16 dummy0
> drwxr-xr-x 4 root root 0 2008-05-07 15:24 eth0
> drwxr-xr-x 3 root root 0 2008-05-07 13:16 lo
> drwxr-xr-x 4 root root 0 2008-05-07 15:26 veth1
> 
> 
> Inside the namespace:
> ----------------------
> 
> qemu:~> ip l
> 14: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 15: veth2: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 
> 1000
>     link/ether 46:85:e5:76:90:05 brd ff:ff:ff:ff:ff:ff
> 
> virtnode:~lxc # ll /sys/class/net/
> total 0
> drwxr-xr-x 3 root root 0 May  7 15:28 lo
> drwxr-xr-x 3 root root 0 May  7 15:26 veth2
> 
> 2) CONFIG_SYSFS && CONFIG_NET_NS
> ================================
> 
> 
> Outside the namespace:
> ----------------------
> 
> qemu:~> ip l
> 1: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
>     link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
> 3: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop
>     link/ether 72:16:3d:88:11:70 brd ff:ff:ff:ff:ff:ff
> 4: br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
>     link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
> 13: veth1: <BROADCAST,MULTICAST,PROMISC> mtu 1500 qdisc pfifo_fast qlen 
> 1000
>     link/ether aa:6f:e8:dd:b8:ba brd ff:ff:ff:ff:ff:ff
> 
>  * Content of /sys/class/net:
> 
> qemu:~/lxc> ll /sys/class/net/
> total 0
> lrwxrwxrwx 1 root root 0 2008-05-07 14:31 br0 -> 
> ../../devices/virtual/net/br0
> lrwxrwxrwx 1 root root 0 2008-05-07 14:28 dummy0 -> 
> ../../devices/virtual/net/dummy0
> lrwxrwxrwx 1 root root 0 2008-05-07 14:28 eth0 -> 
> ../../devices/pci0000:00/0000:00:03.0/net/eth0
> lrwxrwxrwx 1 root root 0 2008-05-07 14:28 lo -> 
> ../../devices/virtual/net/lo
> lrwxrwxrwx 1 root root 0 2008-05-07 14:35 veth1 -> 
> ../../devices/virtual/net/veth1
> 
> Inside the namespace:
> ----------------------
> 
> qemu:~> ip l
> 11: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 12: veth2: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 
> 1000
>     link/ether ee:c5:a3:7c:58:bd brd ff:ff:ff:ff:ff:ff
> 
> virtnode:~/lxc # ll /sys/class/net/
> total 0
> lrwxrwxrwx 1 root root 0 May  7 14:40 lo -> ../../devices/virtual/net/lo
> lrwxrwxrwx 1 root root 0 May  7 14:40 veth2 -> 
> ../../devices/virtual/net/veth2
> 
> 
> 3) CONFIG_SYSFS
> ===============
> 
> qemu:~> ip l
> 1: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
>     link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
> 3: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop
>     link/ether 6e:3a:5f:2f:fa:cb brd ff:ff:ff:ff:ff:ff
> 4: br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
>     link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
> 
> qemu:~/lxc> ll /sys/class/net/
> total 0
> lrwxrwxrwx 1 root root 0 2008-05-07 15:01 br0 -> 
> ../../devices/virtual/net/br0
> lrwxrwxrwx 1 root root 0 2008-05-07 14:59 dummy0 -> 
> ../../devices/virtual/net/dummy0
> lrwxrwxrwx 1 root root 0 2008-05-07 14:59 eth0 -> 
> ../../devices/pci0000:00/0000:00:03.0/net/eth0
> lrwxrwxrwx 1 root root 0 2008-05-07 14:59 lo -> 
> ../../devices/virtual/net/lo
> 
> 4) CONFIG_SYSFS_DEPRECATED && CONFIG_SYSFS
> ==========================================
> 
> qemu:~> ip l
> 1: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
>     link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
> 3: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop
>     link/ether 16:85:f0:a8:34:44 brd ff:ff:ff:ff:ff:ff
> 4: br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
>     link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
> 
> qemu:~> ll /sys/class/net/
> total 0
> drwxr-xr-x 5 root root 0 2008-05-07 15:07 br0
> drwxr-xr-x 3 root root 0 2008-05-07 15:06 dummy0
> drwxr-xr-x 4 root root 0 2008-05-07 15:07 eth0
> drwxr-xr-x 3 root root 0 2008-05-07 15:06 lo
> 
> 


-- 
B e n j a m i n   T h e r y  - BULL/DT/Open Software R&D

    http://www.bull.com
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