linux-kernel - Re: [PATCH 06/11] sysfs: Implement sysfs tagged directory support.

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Date:	Thu, 03 Jul 2008 14:55:38 +0200
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Tejun Heo <htejun@...il.com>, Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>,
	Linux Containers <containers@...ts.osdl.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin Thery <benjamin.thery@...l.net>
Subject: Re: [PATCH 06/11] sysfs: Implement sysfs tagged directory support.

Eric W. Biederman wrote:
> Daniel Lezcano <dlezcano@...ibm.com> writes:
> 
>> The kobject events are sent through a netlink message which is not currently per
>> network namespace. Shouldn't be useful to have a way to retrieve from the
>> kobject the network namespace or the uevent socket associated with it ? IMHO
>> having idr in the kobject + netns pointer associated may help to handle the
>> sysfs isolation and makes the uevent per namespace trivial, no ?
> 
> Grumble.  I have been conveniently been forgetting about that socket.
> Similarly we have the user mode helpers to deal with.
> 
> For this conversation there is a simple answer.  All of that is in the
> kobject layer, and works even when you compile sysfs out of your kernel.
> Therefore it is a separate problem.  And sysfs idr tags have nothing
> to do with it.

Ah Ok, I am not really familiar with kobject/sysfs so I thought there 
was a proposition to store the id in the kobject instead of using the 
tag callbacks, so I figured, perhaps, the idr could have been used in 
the kobject layer and the sysfs being built upon that.

> It is most definitely something we need to come back to.  I bet there
> are some interesting interactions when you have multiple network devices
> with the same name generating events.

Yes as mentionned Benjamin, we have the eth0 in the init_net which is 
shut down when a network namespace with a netdev with the same name 
exits. There is a udev rule which ifdown eth0 :)
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