linux/fs/ocfs2/heartbeat.c
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   1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 * heartbeat.c
   5 *
   6 * Register ourselves with the heartbaet service, keep our node maps
   7 * up to date, and fire off recovery when needed.
   8 *
   9 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  10 *
  11 * This program is free software; you can redistribute it and/or
  12 * modify it under the terms of the GNU General Public
  13 * License as published by the Free Software Foundation; either
  14 * version 2 of the License, or (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19 * General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public
  22 * License along with this program; if not, write to the
  23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 * Boston, MA 021110-1307, USA.
  25 */
  26
  27#include <linux/fs.h>
  28#include <linux/types.h>
  29#include <linux/highmem.h>
  30
  31#include <cluster/masklog.h>
  32
  33#include "ocfs2.h"
  34
  35#include "alloc.h"
  36#include "heartbeat.h"
  37#include "inode.h"
  38#include "journal.h"
  39#include "ocfs2_trace.h"
  40
  41#include "buffer_head_io.h"
  42
  43static inline void __ocfs2_node_map_set_bit(struct ocfs2_node_map *map,
  44                                            int bit);
  45static inline void __ocfs2_node_map_clear_bit(struct ocfs2_node_map *map,
  46                                              int bit);
  47
  48/* special case -1 for now
  49 * TODO: should *really* make sure the calling func never passes -1!!  */
  50static void ocfs2_node_map_init(struct ocfs2_node_map *map)
  51{
  52        map->num_nodes = OCFS2_NODE_MAP_MAX_NODES;
  53        memset(map->map, 0, BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES) *
  54               sizeof(unsigned long));
  55}
  56
  57void ocfs2_init_node_maps(struct ocfs2_super *osb)
  58{
  59        spin_lock_init(&osb->node_map_lock);
  60        ocfs2_node_map_init(&osb->osb_recovering_orphan_dirs);
  61}
  62
  63void ocfs2_do_node_down(int node_num, void *data)
  64{
  65        struct ocfs2_super *osb = data;
  66
  67        BUG_ON(osb->node_num == node_num);
  68
  69        trace_ocfs2_do_node_down(node_num);
  70
  71        if (!osb->cconn) {
  72                /*
  73                 * No cluster connection means we're not even ready to
  74                 * participate yet.  We check the slots after the cluster
  75                 * comes up, so we will notice the node death then.  We
  76                 * can safely ignore it here.
  77                 */
  78                return;
  79        }
  80
  81        ocfs2_recovery_thread(osb, node_num);
  82}
  83
  84static inline void __ocfs2_node_map_set_bit(struct ocfs2_node_map *map,
  85                                            int bit)
  86{
  87        set_bit(bit, map->map);
  88}
  89
  90void ocfs2_node_map_set_bit(struct ocfs2_super *osb,
  91                            struct ocfs2_node_map *map,
  92                            int bit)
  93{
  94        if (bit==-1)
  95                return;
  96        BUG_ON(bit >= map->num_nodes);
  97        spin_lock(&osb->node_map_lock);
  98        __ocfs2_node_map_set_bit(map, bit);
  99        spin_unlock(&osb->node_map_lock);
 100}
 101
 102static inline void __ocfs2_node_map_clear_bit(struct ocfs2_node_map *map,
 103                                              int bit)
 104{
 105        clear_bit(bit, map->map);
 106}
 107
 108void ocfs2_node_map_clear_bit(struct ocfs2_super *osb,
 109                              struct ocfs2_node_map *map,
 110                              int bit)
 111{
 112        if (bit==-1)
 113                return;
 114        BUG_ON(bit >= map->num_nodes);
 115        spin_lock(&osb->node_map_lock);
 116        __ocfs2_node_map_clear_bit(map, bit);
 117        spin_unlock(&osb->node_map_lock);
 118}
 119
 120int ocfs2_node_map_test_bit(struct ocfs2_super *osb,
 121                            struct ocfs2_node_map *map,
 122                            int bit)
 123{
 124        int ret;
 125        if (bit >= map->num_nodes) {
 126                mlog(ML_ERROR, "bit=%d map->num_nodes=%d\n", bit, map->num_nodes);
 127                BUG();
 128        }
 129        spin_lock(&osb->node_map_lock);
 130        ret = test_bit(bit, map->map);
 131        spin_unlock(&osb->node_map_lock);
 132        return ret;
 133}
 134
 135
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