xref: /openbmc/linux/fs/ocfs2/cluster/heartbeat.h (revision 6d4a93b6)
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 */
22 extern 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 */
31 enum o2hb_callback_type {
32 	O2HB_NODE_DOWN_CB = 0,
33 	O2HB_NODE_UP_CB,
34 	O2HB_NUM_CB
35 };
36 
37 struct o2nm_node;
38 typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);
39 
40 struct 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 
49 struct config_group *o2hb_alloc_hb_set(void);
50 void o2hb_free_hb_set(struct config_group *group);
51 
52 void 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);
57 int o2hb_register_callback(const char *region_uuid,
58 			   struct o2hb_callback_func *hc);
59 void o2hb_unregister_callback(const char *region_uuid,
60 			      struct o2hb_callback_func *hc);
61 void o2hb_fill_node_map(unsigned long *map,
62 			unsigned int bits);
63 void o2hb_exit(void);
64 void o2hb_init(void);
65 int o2hb_check_node_heartbeating_no_sem(u8 node_num);
66 int o2hb_check_node_heartbeating_from_callback(u8 node_num);
67 void o2hb_stop_all_regions(void);
68 int o2hb_get_all_regions(char *region_uuids, u8 numregions);
69 int o2hb_global_heartbeat_active(void);
70 
71 #endif /* O2CLUSTER_HEARTBEAT_H */
72