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 */
  39 extern 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 */
  48 enum o2hb_callback_type {
  49         O2HB_NODE_DOWN_CB = 0,
  50         O2HB_NODE_UP_CB,
  51         O2HB_NUM_CB
  52 };
  53
  54 struct o2nm_node;
  55 typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);
  56
  57 struct 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
  66 struct config_group *o2hb_alloc_hb_set(void);
  67 void o2hb_free_hb_set(struct config_group *group);
  68
  69 void 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);
  74 int o2hb_register_callback(const char *region_uuid,
  75                            struct o2hb_callback_func *hc);
  76 void o2hb_unregister_callback(const char *region_uuid,
  77                               struct o2hb_callback_func *hc);
  78 void o2hb_fill_node_map(unsigned long *map,
  79                         unsigned bytes);
  80 void o2hb_exit(void);
  81 int o2hb_init(void);
  82 int o2hb_check_node_heartbeating(u8 node_num);
  83 int o2hb_check_node_heartbeating_from_callback(u8 node_num);
  84 int o2hb_check_local_node_heartbeating(void);
  85 void o2hb_stop_all_regions(void);
  86 int o2hb_get_all_regions(char *region_uuids, u8 numregions);
  87 int o2hb_global_heartbeat_active(void);
  88
  89 #endif /* O2CLUSTER_HEARTBEAT_H */