/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * heartbeat.h
 *
 * Function prototypes
 *
 * Copyright (C) 2004 Oracle.  All rights reserved.
 */

#ifndef O2CLUSTER_HEARTBEAT_H
#define O2CLUSTER_HEARTBEAT_H

#include "ocfs2_heartbeat.h"

#define O2HB_REGION_TIMEOUT_MS          2000

#define O2HB_MAX_REGION_NAME_LEN        32

/* number of changes to be seen as live */
#define O2HB_LIVE_THRESHOLD        2
/* number of equal samples to be seen as dead */
extern unsigned int o2hb_dead_threshold;
#define O2HB_DEFAULT_DEAD_THRESHOLD        31
/* Otherwise MAX_WRITE_TIMEOUT will be zero... */
#define O2HB_MIN_DEAD_THRESHOLD   2
#define O2HB_MAX_WRITE_TIMEOUT_MS (O2HB_REGION_TIMEOUT_MS * (o2hb_dead_threshold - 1))

#define O2HB_CB_MAGIC           0x51d1e4ec

/* callback stuff */
enum o2hb_callback_type {
        O2HB_NODE_DOWN_CB = 0,
        O2HB_NODE_UP_CB,
        O2HB_NUM_CB
};

struct o2nm_node;
typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);

struct o2hb_callback_func {
        u32                     hc_magic;
        struct list_head        hc_item;
        o2hb_cb_func            *hc_func;
        void                    *hc_data;
        int                     hc_priority;
        enum o2hb_callback_type hc_type;
};

struct config_group *o2hb_alloc_hb_set(void);
void o2hb_free_hb_set(struct config_group *group);

void o2hb_setup_callback(struct o2hb_callback_func *hc,
                         enum o2hb_callback_type type,
                         o2hb_cb_func *func,
                         void *data,
                         int priority);
int o2hb_register_callback(const char *region_uuid,
                           struct o2hb_callback_func *hc);
void o2hb_unregister_callback(const char *region_uuid,
                              struct o2hb_callback_func *hc);
void o2hb_fill_node_map(unsigned long *map,
                        unsigned int bits);
void o2hb_exit(void);
void o2hb_init(void);
int o2hb_check_node_heartbeating_no_sem(u8 node_num);
int o2hb_check_node_heartbeating_from_callback(u8 node_num);
void o2hb_stop_all_regions(void);
int o2hb_get_all_regions(char *region_uuids, u8 numregions);
int o2hb_global_heartbeat_active(void);

#endif /* O2CLUSTER_HEARTBEAT_H */