LXR linux/include/linux/genetlink.h

   1#ifndef __LINUX_GENERIC_NETLINK_H
   2#define __LINUX_GENERIC_NETLINK_H
   3
   4#include <uapi/linux/genetlink.h>
   5
   6
   7/* All generic netlink requests are serialized by a global lock.  */
   8extern void genl_lock(void);
   9extern void genl_unlock(void);
  10#ifdef CONFIG_LOCKDEP
  11extern bool lockdep_genl_is_held(void);
  12#endif
  13
  14/* for synchronisation between af_netlink and genetlink */
  15extern atomic_t genl_sk_destructing_cnt;
  16extern wait_queue_head_t genl_sk_destructing_waitq;
  17
  18/**
  19 * rcu_dereference_genl - rcu_dereference with debug checking
  20 * @p: The pointer to read, prior to dereferencing
  21 *
  22 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
  23 * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
  24 */
  25#define rcu_dereference_genl(p)                                 \
  26        rcu_dereference_check(p, lockdep_genl_is_held())
  27
  28/**
  29 * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
  30 * @p: The pointer to read, prior to dereferencing
  31 *
  32 * Return the value of the specified RCU-protected pointer, but omit
  33 * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
  34 * caller holds genl mutex.
  35 */
  36#define genl_dereference(p)                                     \
  37        rcu_dereference_protected(p, lockdep_genl_is_held())
  38
  39#define MODULE_ALIAS_GENL_FAMILY(family)\
  40 MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family)
  41
  42#endif  /* __LINUX_GENERIC_NETLINK_H */
  43