Pavel Emelyanov dec827d174 [NETNS]: The generic per-net pointers. ... Add the elastic array of void * pointer to the struct net. The access rules are simple: 1. register the ops with register_pernet_gen_device to get the id of your private pointer 2. call net_assign_generic() to put the private data on the struct net (most preferably this should be done in the ->init callback of the ops registered) 3. do not store any private reference on the net_generic array; 4. do not change this pointer while the net is alive; 5. use the net_generic() to get the pointer. When adding a new pointer, I copy the old array, replace it with a new one and schedule the old for kfree after an RCU grace period. Since the net_generic explores the net->gen array inside rcu read section and once set the net->gen->ptr[x] pointer never changes, this grants us a safe access to generic pointers. Quoting Paul: "... RCU is protecting -only- the net_generic structure that net_generic() is traversing, and the [pointer] returned by net_generic() is protected by a reference counter in the upper-level struct net." Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2008-04-15 00:36:08 -07:00
..
core.h	[SOCK][NETNS]: Add the percpu prot_inuse counter in the struct net.	2008-03-31 19:42:16 -07:00
dccp.h	[NETNS][DCCPV6]: Move the dccp_v6_ctl_sk on the struct net.	2008-04-13 22:32:25 -07:00
generic.h	[NETNS]: The generic per-net pointers.	2008-04-15 00:36:08 -07:00
ipv4.h	[NETNS]: Create tcp control socket in the each namespace.	2008-04-03 14:31:33 -07:00
ipv6.h
packet.h
unix.h
x_tables.h