Re: [PATCH net-next 3/4] bpf: add support for persistent maps/progs

On 10/22/2015 09:35 PM, Eric W. Biederman wrote:

Daniel Borkmann [off-list ref] writes:

quoted

On 10/20/2015 08:56 PM, Eric W. Biederman wrote:
...

quoted

Just FYI:  Using a device for this kind of interface is pretty
much a non-starter as that quickly gets you into situations where
things do not work in containers.  If someone gets a version of device
namespaces past GregKH it might be up for discussion to use character
devices.

Okay, you are referring to this discussion here:

   http://thread.gmane.org/gmane.linux.kernel.containers/26760

That is a piece of it.  It is an old old discussion (which generally has
been handled poorly).  For the forseeable future device namespaces have
a firm NACK by GregKH.  Which means that dynamic character device based
interfaces do not work in containers.  Which means if you are not
talking about physical hardware, character devices are a poor fit.

Yes, it breaks down with real namespace support. Reworking the set with
an improved version of the fs code is already in progress.

Thanks,
Daniel