1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * heartbeat.h
5 *
6 * Function prototypes
7 *
8 * Copyright (C) 2004 Oracle.  All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 *
25 */
26
27#ifndef O2CLUSTER_HEARTBEAT_H
28#define O2CLUSTER_HEARTBEAT_H
29
30#include "ocfs2_heartbeat.h"
31
32#define O2HB_REGION_TIMEOUT_MS		2000
33
34/* number of changes to be seen as live */
35#define O2HB_LIVE_THRESHOLD	   2
36/* number of equal samples to be seen as dead */
37extern unsigned int o2hb_dead_threshold;
38#define O2HB_DEFAULT_DEAD_THRESHOLD	   7
39/* Otherwise MAX_WRITE_TIMEOUT will be zero... */
40#define O2HB_MIN_DEAD_THRESHOLD	  2
41#define O2HB_MAX_WRITE_TIMEOUT_MS (O2HB_REGION_TIMEOUT_MS * (o2hb_dead_threshold - 1))
42
43#define O2HB_CB_MAGIC		0x51d1e4ec
44
45/* callback stuff */
46enum o2hb_callback_type {
47	O2HB_NODE_DOWN_CB = 0,
48	O2HB_NODE_UP_CB,
49	O2HB_NUM_CB
50};
51
52struct o2nm_node;
53typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);
54
55struct o2hb_callback_func {
56	u32			hc_magic;
57	struct list_head	hc_item;
58	o2hb_cb_func		*hc_func;
59	void			*hc_data;
60	int			hc_priority;
61	enum o2hb_callback_type hc_type;
62};
63
64struct config_group *o2hb_alloc_hb_set(void);
65void o2hb_free_hb_set(struct config_group *group);
66
67void o2hb_setup_callback(struct o2hb_callback_func *hc,
68			 enum o2hb_callback_type type,
69			 o2hb_cb_func *func,
70			 void *data,
71			 int priority);
72int o2hb_register_callback(struct o2hb_callback_func *hc);
73void o2hb_unregister_callback(struct o2hb_callback_func *hc);
74void o2hb_fill_node_map(unsigned long *map,
75			unsigned bytes);
76void o2hb_init(void);
77int o2hb_check_node_heartbeating(u8 node_num);
78int o2hb_check_node_heartbeating_from_callback(u8 node_num);
79int o2hb_check_local_node_heartbeating(void);
80void o2hb_stop_all_regions(void);
81
82#endif /* O2CLUSTER_HEARTBEAT_H */
83