LXR linux/fs/ocfs2/cluster/heartbeat.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/* -*- mode: c; c-basic-offset: 8; -*-
   3 * vim: noexpandtab sw=8 ts=8 sts=0:
   4 *
   5 * heartbeat.h
   6 *
   7 * Function prototypes
   8 *
   9 * Copyright (C) 2004 Oracle.  All rights reserved.
  10 */
  11
  12#ifndef O2CLUSTER_HEARTBEAT_H
  13#define O2CLUSTER_HEARTBEAT_H
  14
  15#include "ocfs2_heartbeat.h"
  16
  17#define O2HB_REGION_TIMEOUT_MS          2000
  18
  19#define O2HB_MAX_REGION_NAME_LEN        32
  20
  21/* number of changes to be seen as live */
  22#define O2HB_LIVE_THRESHOLD        2
  23/* number of equal samples to be seen as dead */
  24extern unsigned int o2hb_dead_threshold;
  25#define O2HB_DEFAULT_DEAD_THRESHOLD        31
  26/* Otherwise MAX_WRITE_TIMEOUT will be zero... */
  27#define O2HB_MIN_DEAD_THRESHOLD   2
  28#define O2HB_MAX_WRITE_TIMEOUT_MS (O2HB_REGION_TIMEOUT_MS * (o2hb_dead_threshold - 1))
  29
  30#define O2HB_CB_MAGIC           0x51d1e4ec
  31
  32/* callback stuff */
  33enum o2hb_callback_type {
  34        O2HB_NODE_DOWN_CB = 0,
  35        O2HB_NODE_UP_CB,
  36        O2HB_NUM_CB
  37};
  38
  39struct o2nm_node;
  40typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);
  41
  42struct o2hb_callback_func {
  43        u32                     hc_magic;
  44        struct list_head        hc_item;
  45        o2hb_cb_func            *hc_func;
  46        void                    *hc_data;
  47        int                     hc_priority;
  48        enum o2hb_callback_type hc_type;
  49};
  50
  51struct config_group *o2hb_alloc_hb_set(void);
  52void o2hb_free_hb_set(struct config_group *group);
  53
  54void o2hb_setup_callback(struct o2hb_callback_func *hc,
  55                         enum o2hb_callback_type type,
  56                         o2hb_cb_func *func,
  57                         void *data,
  58                         int priority);
  59int o2hb_register_callback(const char *region_uuid,
  60                           struct o2hb_callback_func *hc);
  61void o2hb_unregister_callback(const char *region_uuid,
  62                              struct o2hb_callback_func *hc);
  63void o2hb_fill_node_map(unsigned long *map,
  64                        unsigned bytes);
  65void o2hb_exit(void);
  66void o2hb_init(void);
  67int o2hb_check_node_heartbeating_no_sem(u8 node_num);
  68int o2hb_check_node_heartbeating_from_callback(u8 node_num);
  69void o2hb_stop_all_regions(void);
  70int o2hb_get_all_regions(char *region_uuids, u8 numregions);
  71int o2hb_global_heartbeat_active(void);
  72
  73#endif /* O2CLUSTER_HEARTBEAT_H */
  74