1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * heartbeat.h
4 *
5 * Function prototypes
6 *
7 * Copyright (C) 2004 Oracle.  All rights reserved.
8 */
9
10#ifndef O2CLUSTER_HEARTBEAT_H
11#define O2CLUSTER_HEARTBEAT_H
12
13#include "ocfs2_heartbeat.h"
14
15#define O2HB_REGION_TIMEOUT_MS		2000
16
17#define O2HB_MAX_REGION_NAME_LEN	32
18
19/* number of changes to be seen as live */
20#define O2HB_LIVE_THRESHOLD	   2
21/* number of equal samples to be seen as dead */
22extern unsigned int o2hb_dead_threshold;
23#define O2HB_DEFAULT_DEAD_THRESHOLD	   31
24/* Otherwise MAX_WRITE_TIMEOUT will be zero... */
25#define O2HB_MIN_DEAD_THRESHOLD	  2
26#define O2HB_MAX_WRITE_TIMEOUT_MS (O2HB_REGION_TIMEOUT_MS * (o2hb_dead_threshold - 1))
27
28#define O2HB_CB_MAGIC		0x51d1e4ec
29
30/* callback stuff */
31enum o2hb_callback_type {
32	O2HB_NODE_DOWN_CB = 0,
33	O2HB_NODE_UP_CB,
34	O2HB_NUM_CB
35};
36
37struct o2nm_node;
38typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);
39
40struct o2hb_callback_func {
41	u32			hc_magic;
42	struct list_head	hc_item;
43	o2hb_cb_func		*hc_func;
44	void			*hc_data;
45	int			hc_priority;
46	enum o2hb_callback_type hc_type;
47};
48
49struct config_group *o2hb_alloc_hb_set(void);
50void o2hb_free_hb_set(struct config_group *group);
51
52void o2hb_setup_callback(struct o2hb_callback_func *hc,
53			 enum o2hb_callback_type type,
54			 o2hb_cb_func *func,
55			 void *data,
56			 int priority);
57int o2hb_register_callback(const char *region_uuid,
58			   struct o2hb_callback_func *hc);
59void o2hb_unregister_callback(const char *region_uuid,
60			      struct o2hb_callback_func *hc);
61void o2hb_fill_node_map(unsigned long *map,
62			unsigned int bits);
63void o2hb_exit(void);
64void o2hb_init(void);
65int o2hb_check_node_heartbeating_no_sem(u8 node_num);
66int o2hb_check_node_heartbeating_from_callback(u8 node_num);
67void o2hb_stop_all_regions(void);
68int o2hb_get_all_regions(char *region_uuids, u8 numregions);
69int o2hb_global_heartbeat_active(void);
70
71#endif /* O2CLUSTER_HEARTBEAT_H */
72