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

   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#define O2HB_MAX_REGION_NAME_LEN        32
  35
  36/* number of changes to be seen as live */
  37#define O2HB_LIVE_THRESHOLD        2
  38/* number of equal samples to be seen as dead */
  39extern unsigned int o2hb_dead_threshold;
  40#define O2HB_DEFAULT_DEAD_THRESHOLD        31
  41/* Otherwise MAX_WRITE_TIMEOUT will be zero... */
  42#define O2HB_MIN_DEAD_THRESHOLD   2
  43#define O2HB_MAX_WRITE_TIMEOUT_MS (O2HB_REGION_TIMEOUT_MS * (o2hb_dead_threshold - 1))
  44
  45#define O2HB_CB_MAGIC           0x51d1e4ec
  46
  47/* callback stuff */
  48enum o2hb_callback_type {
  49        O2HB_NODE_DOWN_CB = 0,
  50        O2HB_NODE_UP_CB,
  51        O2HB_NUM_CB
  52};
  53
  54struct o2nm_node;
  55typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);
  56
  57struct o2hb_callback_func {
  58        u32                     hc_magic;
  59        struct list_head        hc_item;
  60        o2hb_cb_func            *hc_func;
  61        void                    *hc_data;
  62        int                     hc_priority;
  63        enum o2hb_callback_type hc_type;
  64};
  65
  66struct config_group *o2hb_alloc_hb_set(void);
  67void o2hb_free_hb_set(struct config_group *group);
  68
  69void o2hb_setup_callback(struct o2hb_callback_func *hc,
  70                         enum o2hb_callback_type type,
  71                         o2hb_cb_func *func,
  72                         void *data,
  73                         int priority);
  74int o2hb_register_callback(const char *region_uuid,
  75                           struct o2hb_callback_func *hc);
  76void o2hb_unregister_callback(const char *region_uuid,
  77                              struct o2hb_callback_func *hc);
  78void o2hb_fill_node_map(unsigned long *map,
  79                        unsigned bytes);
  80void o2hb_exit(void);
  81int o2hb_init(void);
  82int o2hb_check_node_heartbeating_no_sem(u8 node_num);
  83int o2hb_check_node_heartbeating_from_callback(u8 node_num);
  84void o2hb_stop_all_regions(void);
  85int o2hb_get_all_regions(char *region_uuids, u8 numregions);
  86int o2hb_global_heartbeat_active(void);
  87
  88#endif /* O2CLUSTER_HEARTBEAT_H */
  89