LXR linux/drivers/staging/ramster/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 R2CLUSTER_HEARTBEAT_H
  28#define R2CLUSTER_HEARTBEAT_H
  29
  30#define R2HB_REGION_TIMEOUT_MS          2000
  31
  32#define R2HB_MAX_REGION_NAME_LEN        32
  33
  34/* number of changes to be seen as live */
  35#define R2HB_LIVE_THRESHOLD        2
  36/* number of equal samples to be seen as dead */
  37extern unsigned int r2hb_dead_threshold;
  38#define R2HB_DEFAULT_DEAD_THRESHOLD        31
  39/* Otherwise MAX_WRITE_TIMEOUT will be zero... */
  40#define R2HB_MIN_DEAD_THRESHOLD   2
  41#define R2HB_MAX_WRITE_TIMEOUT_MS \
  42        (R2HB_REGION_TIMEOUT_MS * (r2hb_dead_threshold - 1))
  43
  44#define R2HB_CB_MAGIC           0x51d1e4ec
  45
  46/* callback stuff */
  47enum r2hb_callback_type {
  48        R2HB_NODE_DOWN_CB = 0,
  49        R2HB_NODE_UP_CB,
  50        R2HB_NUM_CB
  51};
  52
  53struct r2nm_node;
  54typedef void (r2hb_cb_func)(struct r2nm_node *, int, void *);
  55
  56struct r2hb_callback_func {
  57        u32                     hc_magic;
  58        struct list_head        hc_item;
  59        r2hb_cb_func            *hc_func;
  60        void                    *hc_data;
  61        int                     hc_priority;
  62        enum r2hb_callback_type hc_type;
  63};
  64
  65struct config_group *r2hb_alloc_hb_set(void);
  66void r2hb_free_hb_set(struct config_group *group);
  67
  68void r2hb_setup_callback(struct r2hb_callback_func *hc,
  69                         enum r2hb_callback_type type,
  70                         r2hb_cb_func *func,
  71                         void *data,
  72                         int priority);
  73int r2hb_register_callback(const char *region_uuid,
  74                           struct r2hb_callback_func *hc);
  75void r2hb_unregister_callback(const char *region_uuid,
  76                              struct r2hb_callback_func *hc);
  77void r2hb_fill_node_map(unsigned long *map,
  78                        unsigned bytes);
  79void r2hb_exit(void);
  80int r2hb_init(void);
  81int r2hb_check_node_heartbeating_from_callback(u8 node_num);
  82void r2hb_stop_all_regions(void);
  83int r2hb_get_all_regions(char *region_uuids, u8 numregions);
  84int r2hb_global_heartbeat_active(void);
  85void r2hb_manual_set_node_heartbeating(int);
  86
  87#endif /* R2CLUSTER_HEARTBEAT_H */
  88