[Devel] Fwd: Why real device can't move to container when sysfs is enabled?

[贺鹏]

---------- Forwarded message ----------
From: 贺鹏 <xnhp0320 at gmail.com>
Date: 2010/6/18
Subject: Why real device can't move to container when sysfs is enabled?
To: Devel at openvz.org
Cc: User at openvz.org


I'm using the openvz kernel 2.6.32,  and found that I can't netdev_add a
real net device to a container.

I found the function* __dev_change_net_namespac*e in net/core/dev.c, and it
says:


#ifdef CONFIG_SYSFS
        /* Don't allow real devices to be moved when sysfs
         * is enabled.
         */
        err = -EINVAL;
        if (dev->dev.parent)
                goto out;
#endif


It seems if you enable CONFIG_SYSFS, you can't add a real device to a
container with the netdev_add command.

I'm confused about this, because under kernel 2.6.18, it's ok to add a real
device when sysfs is enabled.

Why forbid this?
and if I want to add a net device, How?


-- 
hepeng
ICT




-- 
hepeng
ICT
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