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65c0cfafce
No that all of the callers have been updated to set fields in struct pernet_operations, and simplified to let the network namespace core handle the allocation and freeing of the storage for them, remove the surpurpflous methods and update the docs to the new style. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/*
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* generic net pointers
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*/
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#ifndef __NET_GENERIC_H__
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#define __NET_GENERIC_H__
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#include <linux/rcupdate.h>
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/*
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* Generic net pointers are to be used by modules to put some private
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* stuff on the struct net without explicit struct net modification
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*
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* The rules are simple:
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* 1. set pernet_operations->id. After register_pernet_device you
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* will have the id of your private pointer.
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* 2. Either set pernet_operations->size (to have the code allocate and
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* free a private structure pointed to from struct net ) or
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* call net_assign_generic() to put the private data on the struct
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* net (most preferably this should be done in the ->init callback
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* of the ops registered);
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* 3. do not change this pointer while the net is alive;
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* 4. do not try to have any private reference on the net_generic object.
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*
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* After accomplishing all of the above, the private pointer can be
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* accessed with the net_generic() call.
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*/
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struct net_generic {
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unsigned int len;
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struct rcu_head rcu;
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void *ptr[0];
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};
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static inline void *net_generic(struct net *net, int id)
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{
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struct net_generic *ng;
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void *ptr;
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rcu_read_lock();
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ng = rcu_dereference(net->gen);
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BUG_ON(id == 0 || id > ng->len);
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ptr = ng->ptr[id - 1];
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rcu_read_unlock();
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return ptr;
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}
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extern int net_assign_generic(struct net *net, int id, void *data);
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#endif
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