netns: use a spin_lock to protect nsid management

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Before this patch, nsid were protected by the rtnl lock. The goal of this
patch is to be able to find a nsid without needing to hold the rtnl lock.

The next patch will introduce a netlink socket option to listen to all
netns that have a nsid assigned into the netns where the socket is opened.
Thus, it's important to call rtnl_net_notifyid() outside the spinlock, to
avoid a recursive lock (nsid are notified via rtnl). This was the main
reason of the previous patch.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Nicolas Dichtel 2015-05-07 11:02:51 +02:00 • committed by David S. Miller

parent 3138dbf881

commit 95f38411df

1 changed files with 44 additions and 13 deletions

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57

net/core/net_namespace.c

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