Lucid SRU - UBUNTU: SAUCE: netns: Add quota for number of NET_NS instances.

[Tim Gardner]

Please consider this (untested) patch for inclusion in Lucid. See the 
discussion in http://bugs.launchpad.net/bugs/790863 for arguments 
proposing to restore CONFIG_NET_NS.

I'll post a test kernel to the bug in awhile.

One of the issues I have with this patch is that it appears that any 
consumer of network name spaces will have to initially write a non-zero 
value to netns_max before _any_ name spaces can be successfully 
allocated. If copy_net_ns() fails in create_new_namespaces(), then it 
seems the whole allocation is buggered.

rtg
-- 
Tim Gardner tim.gardner at canonical.com
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