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heartbeat.h
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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 #define O2HB_MAX_REGION_NAME_LEN 32
35 
36 /* number of changes to be seen as live */
37 #define O2HB_LIVE_THRESHOLD 2
38 /* number of equal samples to be seen as dead */
39 extern unsigned int o2hb_dead_threshold;
40 #define O2HB_DEFAULT_DEAD_THRESHOLD 31
41 /* Otherwise MAX_WRITE_TIMEOUT will be zero... */
42 #define O2HB_MIN_DEAD_THRESHOLD 2
43 #define O2HB_MAX_WRITE_TIMEOUT_MS (O2HB_REGION_TIMEOUT_MS * (o2hb_dead_threshold - 1))
44 
45 #define O2HB_CB_MAGIC 0x51d1e4ec
46 
47 /* callback stuff */
52 };
53 
54 struct o2nm_node;
55 typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);
56 
61  void *hc_data;
64 };
65 
66 struct config_group *o2hb_alloc_hb_set(void);
67 void o2hb_free_hb_set(struct config_group *group);
68 
72  void *data,
73  int priority);
74 int o2hb_register_callback(const char *region_uuid,
75  struct o2hb_callback_func *hc);
76 void o2hb_unregister_callback(const char *region_uuid,
77  struct o2hb_callback_func *hc);
78 void o2hb_fill_node_map(unsigned long *map,
79  unsigned bytes);
80 void o2hb_exit(void);
81 int o2hb_init(void);
82 int o2hb_check_node_heartbeating(u8 node_num);
85 void o2hb_stop_all_regions(void);
86 int o2hb_get_all_regions(char *region_uuids, u8 numregions);
88 
89 #endif /* O2CLUSTER_HEARTBEAT_H */