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 */
37 extern unsigned int o2hb_dead_threshold;
38 #define O2HB_DEFAULT_DEAD_THRESHOLD 31
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 */
46 enum o2hb_callback_type {
47 O2HB_NODE_DOWN_CB = 0,
48 O2HB_NODE_UP_CB,
49 O2HB_NUM_CB
50 };
51
52 struct o2nm_node;
53 typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);
54
55 struct 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
64 struct config_group *o2hb_alloc_hb_set(void);
65 void o2hb_free_hb_set(struct config_group *group);
66
67 void 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);
72 int o2hb_register_callback(const char *region_uuid,
73 struct o2hb_callback_func *hc);
74 void o2hb_unregister_callback(const char *region_uuid,
75 struct o2hb_callback_func *hc);
76 void o2hb_fill_node_map(unsigned long *map,
77 unsigned bytes);
78 void o2hb_init(void);
79 int o2hb_check_node_heartbeating(u8 node_num);
80 int o2hb_check_node_heartbeating_from_callback(u8 node_num);
81 int o2hb_check_local_node_heartbeating(void);
82 void o2hb_stop_all_regions(void);
83
84 #endif /* O2CLUSTER_HEARTBEAT_H */
85
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