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Re: [PATCH net-2.6.26 3/3][TUN][NETNS]: Allow to register tun devices in namespace. [message #29242 is a reply to message #28960] Wed, 02 April 2008 22:54 Go to previous message
Max Krasnyanskiy is currently offline  Max Krasnyanskiy
Messages: 3
Registered: April 2008
Junior Member
Hi Pavel,

All three patches look perfectly fine to me.
Feel free to add Acked-by: Max Krasnyansky <>

Pavel Emelyanov wrote:
> This is basically means that a net is set for a new device, but
> actually this involves two more steps:
> 1. mark the tun device as "local", i.e. do not allow for it to
>    move across namespaces.
> This is done so, since tun device is most often associated to some
> file (and thus to some process) and moving the device alone is not
> valid while keeping the file and the process outside.
> 2. get the tun device's net when tun becomes attached and put one
>    when it becomes detached.
> This is needed to handle the case when a task owning the tun dies,
> but a files lives for some more time - in this case we must not
> allow for net to be freed, since its exit hook will spoil that file's
> private data by unregistering the tun from under tun_chr_close.
I'm not sure what you mean "by file lives on" here. I believe you're talking 
about persistent tun devices. ie Those that exist in detached state and are 
not attached to any file descriptors.
"net" refcounting logic there looks fine to me.

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