[linux-2.6-block.git] / include / linux / genetlink.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_GENERIC_NETLINK_H
#define __LINUX_GENERIC_NETLINK_H

#include <uapi/linux/genetlink.h>


/* All generic netlink requests are serialized by a global lock.  */
extern void genl_lock(void);
extern void genl_unlock(void);
#ifdef CONFIG_LOCKDEP
extern bool lockdep_genl_is_held(void);
#endif

/* for synchronisation between af_netlink and genetlink */
extern atomic_t genl_sk_destructing_cnt;
extern wait_queue_head_t genl_sk_destructing_waitq;

/**
 * rcu_dereference_genl - rcu_dereference with debug checking
 * @p: The pointer to read, prior to dereferencing
 *
 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
 * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
 */
#define rcu_dereference_genl(p)					\
	rcu_dereference_check(p, lockdep_genl_is_held())

/**
 * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
 * @p: The pointer to read, prior to dereferencing
 *
 * Return the value of the specified RCU-protected pointer, but omit
 * the READ_ONCE(), because caller holds genl mutex.
 */
#define genl_dereference(p)					\
	rcu_dereference_protected(p, lockdep_genl_is_held())

#define MODULE_ALIAS_GENL_FAMILY(family)\
 MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family)

#endif	/* __LINUX_GENERIC_NETLINK_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
482a8524 TG	2	#ifndef __LINUX_GENERIC_NETLINK_H
	3	#define __LINUX_GENERIC_NETLINK_H
	4
607ca46e	5	#include <uapi/linux/genetlink.h>
482a8524	6
f408e0ce JC	7
	8	/* All generic netlink requests are serialized by a global lock. */
	9	extern void genl_lock(void);
	10	extern void genl_unlock(void);
320f5ea0	11	#ifdef CONFIG_LOCKDEP
61d03535	12	extern bool lockdep_genl_is_held(void);
86b1309c	13	#endif
f408e0ce	14
ee1c2442 JB	15	/* for synchronisation between af_netlink and genetlink */
	16	extern atomic_t genl_sk_destructing_cnt;
	17	extern wait_queue_head_t genl_sk_destructing_waitq;
	18
b4e16611 JG	19	/**
	20	* rcu_dereference_genl - rcu_dereference with debug checking
	21	* @p: The pointer to read, prior to dereferencing
	22	*
	23	* Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
	24	* or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
	25	*/
	26	#define rcu_dereference_genl(p) \
	27	rcu_dereference_check(p, lockdep_genl_is_held())
	28
	29	/**
	30	* genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
	31	* @p: The pointer to read, prior to dereferencing
	32	*
	33	* Return the value of the specified RCU-protected pointer, but omit
632a5c1c	34	* the READ_ONCE(), because caller holds genl mutex.
b4e16611 JG	35	*/
	36	#define genl_dereference(p) \
	37	rcu_dereference_protected(p, lockdep_genl_is_held())
	38
e9412c37 NH	39	#define MODULE_ALIAS_GENL_FAMILY(family)\
	40	MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family)
	41
482a8524	42	#endif /* __LINUX_GENERIC_NETLINK_H */