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 */
  24 extern 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 */
  33 enum o2hb_callback_type {
  34         O2HB_NODE_DOWN_CB = 0,
  35         O2HB_NODE_UP_CB,
  36         O2HB_NUM_CB
  37 };
  38
  39 struct o2nm_node;
  40 typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);
  41
  42 struct 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
  51 struct config_group *o2hb_alloc_hb_set(void);
  52 void o2hb_free_hb_set(struct config_group *group);
  53
  54 void 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);
  59 int o2hb_register_callback(const char *region_uuid,
  60                            struct o2hb_callback_func *hc);
  61 void o2hb_unregister_callback(const char *region_uuid,
  62                               struct o2hb_callback_func *hc);
  63 void o2hb_fill_node_map(unsigned long *map,
  64                         unsigned bytes);
  65 void o2hb_exit(void);
  66 void o2hb_init(void);
  67 int o2hb_check_node_heartbeating_no_sem(u8 node_num);
  68 int o2hb_check_node_heartbeating_from_callback(u8 node_num);
  69 void o2hb_stop_all_regions(void);
  70 int o2hb_get_all_regions(char *region_uuids, u8 numregions);
  71 int o2hb_global_heartbeat_active(void);
  72
  73 #endif /* O2CLUSTER_HEARTBEAT_H */