ocfs2/cluster/heartbeat.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * heartbeat.h
0004  *
0005  * Function prototypes
0006  *
0007  * Copyright (C) 2004 Oracle.  All rights reserved.
0008  */
0009
0010 #ifndef O2CLUSTER_HEARTBEAT_H
0011 #define O2CLUSTER_HEARTBEAT_H
0012
0013 #include "ocfs2_heartbeat.h"
0014
0015 #define O2HB_REGION_TIMEOUT_MS      2000
0016
0017 #define O2HB_MAX_REGION_NAME_LEN    32
0018
0019 /* number of changes to be seen as live */
0020 #define O2HB_LIVE_THRESHOLD    2
0021 /* number of equal samples to be seen as dead */
0022 extern unsigned int o2hb_dead_threshold;
0023 #define O2HB_DEFAULT_DEAD_THRESHOLD    31
0024 /* Otherwise MAX_WRITE_TIMEOUT will be zero... */
0025 #define O2HB_MIN_DEAD_THRESHOLD   2
0026 #define O2HB_MAX_WRITE_TIMEOUT_MS (O2HB_REGION_TIMEOUT_MS * (o2hb_dead_threshold - 1))
0027
0028 #define O2HB_CB_MAGIC       0x51d1e4ec
0029
0030 /* callback stuff */
0031 enum o2hb_callback_type {
0032     O2HB_NODE_DOWN_CB = 0,
0033     O2HB_NODE_UP_CB,
0034     O2HB_NUM_CB
0035 };
0036
0037 struct o2nm_node;
0038 typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);
0039
0040 struct o2hb_callback_func {
0041     u32         hc_magic;
0042     struct list_head    hc_item;
0043     o2hb_cb_func        *hc_func;
0044     void            *hc_data;
0045     int         hc_priority;
0046     enum o2hb_callback_type hc_type;
0047 };
0048
0049 struct config_group *o2hb_alloc_hb_set(void);
0050 void o2hb_free_hb_set(struct config_group *group);
0051
0052 void o2hb_setup_callback(struct o2hb_callback_func *hc,
0053              enum o2hb_callback_type type,
0054              o2hb_cb_func *func,
0055              void *data,
0056              int priority);
0057 int o2hb_register_callback(const char *region_uuid,
0058                struct o2hb_callback_func *hc);
0059 void o2hb_unregister_callback(const char *region_uuid,
0060                   struct o2hb_callback_func *hc);
0061 void o2hb_fill_node_map(unsigned long *map,
0062             unsigned bytes);
0063 void o2hb_exit(void);
0064 void o2hb_init(void);
0065 int o2hb_check_node_heartbeating_no_sem(u8 node_num);
0066 int o2hb_check_node_heartbeating_from_callback(u8 node_num);
0067 void o2hb_stop_all_regions(void);
0068 int o2hb_get_all_regions(char *region_uuids, u8 numregions);
0069 int o2hb_global_heartbeat_active(void);
0070
0071 #endif /* O2CLUSTER_HEARTBEAT_H */