/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* heartbeat.c
*
* Register ourselves with the heartbaet service, keep our node maps
* up to date, and fire off recovery when needed.
*
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/kmod.h>
#include <cluster/heartbeat.h>
#include <cluster/nodemanager.h>
#include <dlm/dlmapi.h>
#define MLOG_MASK_PREFIX ML_SUPER
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "heartbeat.h"
#include "inode.h"
#include "journal.h"
#include "vote.h"
#include "buffer_head_io.h"
#define OCFS2_HB_NODE_DOWN_PRI (0x0000002)
#define OCFS2_HB_NODE_UP_PRI OCFS2_HB_NODE_DOWN_PRI
static inline void __ocfs2_node_map_set_bit(struct ocfs2_node_map *map,
int bit);
static inline void __ocfs2_node_map_clear_bit(struct ocfs2_node_map *map,
int bit);
static inline int __ocfs2_node_map_is_empty(struct ocfs2_node_map *map);
static void __ocfs2_node_map_dup(struct ocfs2_node_map *target,
struct ocfs2_node_map *from);
static void __ocfs2_node_map_set(struct ocfs2_node_map *target,
struct ocfs2_node_map *from);
void ocfs2_init_node_maps(struct ocfs2_super *osb)
{
spin_lock_init(&osb->node_map_lock);
ocfs2_node_map_init(&osb->mounted_map);
ocfs2_node_map_init(&osb->recovery_map);
ocfs2_node_map_init(&osb->umount_map);
}
static void ocfs2_do_node_down(int node_num,
struct ocfs2_super *osb)
{
BUG_ON(osb->node_num == node_num);
mlog(0, "ocfs2: node down event for %d\n", node_num);
if (!osb->dlm) {
/*
* No DLM means we're not even ready to participate yet.
* We check the slots after the DLM comes up, so we will
* notice the node death then. We can safely ignore it
* here.
*/
return;
}
if (ocfs2_node_map_test_bit(osb, &osb->umount_map, node_num)) {
/* If a node is in the umount map, then we've been
* expecting him to go down and we know ahead of time
* that recovery is not necessary. */
ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num);
return;
}
ocfs2_recovery_thread(osb, node_num);
ocfs2_remove_node_from_vote_queues(osb, node_num);
}
static void ocfs2_hb_node_down_cb(struct o2nm_node *node,
int node_num,
void *data)
{
ocfs2_do_node_down(node_num, (struct ocfs2_super *) data);
}
/* Called from the dlm when it's about to evict a node. We may also
* get a heartbeat callback later. */
static void ocfs2_dlm_eviction_cb(int node_num,
void *data)
{
struct ocfs2_super *osb = (struct ocfs2_super *) data;
struct super_block *sb = osb->sb;
mlog(ML_NOTICE, "device (%u,%u): dlm has evicted node %d\n",
MAJOR(sb->s_dev), MINOR(sb->s_dev), node_num);
ocfs2_do_node_down(node_num, osb);
}
static void ocfs2_hb_node_up_cb(struct o2nm_node *node,
int node_num,
void *data)
{
struct ocfs2_super *osb = data;
BUG_ON(osb->node_num == node_num);
mlog(0, "node up event for %d\n", node_num);
ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num);
}
void ocfs2_setup_hb_callbacks(struct ocfs2_super *osb)
{
o2hb_setup_callback(&osb->osb_hb_down, O2HB_NODE_DOWN_CB,
ocfs2_hb_node_down_cb, osb,
OCFS2_HB_NODE_DOWN_PRI);
o2hb_setup_callback(&osb->osb_hb_up, O2HB_NODE_UP_CB,
ocfs2_hb_node_up_cb, osb, OCFS2_HB_NODE_UP_PRI);
/* Not exactly a heartbeat callback, but leads to essentially
* the same path so we set it up here. */
dlm_setup_eviction_cb(&osb->osb_eviction_cb,
ocfs2_dlm_eviction_cb,
osb);
}
/* Most functions here are just stubs for now... */
int ocfs2_register_hb_callbacks(struct ocfs2_super *osb)
{
int status;
status = o2hb_register_callback(&osb->osb_hb_down);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = o2hb_register_callback(&osb->osb_hb_up);
if (status < 0)
mlog_errno(status);
bail:
return status;
}
void ocfs2_clear_hb_callbacks(struct ocfs2_super *osb)
{
int status;
status = o2hb_unregister_callback(&osb->osb_hb_down);
if (status < 0)
mlog_errno(status);
status = o2hb_unregister_callback(&osb->osb_hb_up);
if (status < 0)
mlog_errno(status);
}
void ocfs2_stop_heartbeat(struct ocfs2_super *osb)
{
int ret;
char *argv[5], *envp[3];
if (!osb->uuid_str) {
/* This can happen if we don't get far enough in mount... */
mlog(0, "No UUID with which to stop heartbeat!\n\n");
return;
}
argv[0] = (char *)o2nm_get_hb_ctl_path();
argv[1] = "-K";
argv[2] = "-u";
argv[3] = osb->uuid_str;
argv[4] = NULL;
mlog(0, "Run: %s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]);
/* minimal command environment taken from cpu_run_sbin_hotplug */
envp[0] = "HOME=/";
envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
envp[2] = NULL;
ret = call_usermodehelper(argv[0], argv, envp, 1);
if (ret < 0)
mlog_errno(ret);
}
/* special case -1 for now
* TODO: should *really* make sure the calling func never passes -1!! */
void ocfs2_node_map_init(struct ocfs2_node_map *map)
{
map->num_nodes = OCFS2_NODE_MAP_MAX_NODES;
memset(map->map, 0, BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES) *
sizeof(unsigned long));
}
static inline void __ocfs2_node_map_set_bit(struct ocfs2_node_map *map,
int bit)
{
set_bit(bit, map->map);
}
void ocfs2_node_map_set_bit(struct ocfs2_super *osb,
struct ocfs2_node_map *map,
int bit)
{
if (bit==-1)
return;
BUG_ON(bit >= map->num_nodes);
spin_lock(&osb->node_map_lock);
__ocfs2_node_map_set_bit(map, bit);
spin_unlock(&osb->node_map_lock);
}
static inline void __ocfs2_node_map_clear_bit(struct ocfs2_node_map *map,
int bit)
{
clear_bit(bit, map->map);
}
void ocfs2_node_map_clear_bit(struct ocfs2_super *osb,
struct ocfs2_node_map *map,
int bit)
{
if (bit==-1)
return;
BUG_ON(bit >= map->num_nodes);
spin_lock(&osb->node_map_lock);
__ocfs2_node_map_clear_bit(map, bit);
spin_unlock(&osb->node_map_lock);
}
int ocfs2_node_map_test_bit(struct ocfs2_super *osb,
struct ocfs2_node_map *map,
int bit)
{
int ret;
if (bit >= map->num_nodes) {
mlog(ML_ERROR, "bit=%d map->num_nodes=%d\n", bit, map->num_nodes);
BUG();
}
spin_lock(&osb->node_map_lock);
ret = test_bit(bit, map->map);
spin_unlock(&osb->node_map_lock);
return ret;
}
static inline int __ocfs2_node_map_is_empty(struct ocfs2_node_map *map)
{
int bit;
bit = find_next_bit(map->map, map->num_nodes, 0);
if (bit < map->num_nodes)
return 0;
return 1;
}
int ocfs2_node_map_is_empty(struct ocfs2_super *osb,
struct ocfs2_node_map *map)
{
int ret;
BUG_ON(map->num_nodes == 0);
spin_lock(&osb->node_map_lock);
ret = __ocfs2_node_map_is_empty(map);
spin_unlock(&osb->node_map_lock);
return ret;
}
static void __ocfs2_node_map_dup(struct ocfs2_node_map *target,
struct ocfs2_node_map *from)
{
BUG_ON(from->num_nodes == 0);
ocfs2_node_map_init(target);
__ocfs2_node_map_set(target, from);
}
/* returns 1 if bit is the only bit set in target, 0 otherwise */
int ocfs2_node_map_is_only(struct ocfs2_super *osb,
struct ocfs2_node_map *target,
int bit)
{
struct ocfs2_node_map temp;
int ret;
spin_lock(&osb->node_map_lock);
__ocfs2_node_map_dup(&temp, target);
__ocfs2_node_map_clear_bit(&temp, bit);
ret = __ocfs2_node_map_is_empty(&temp);
spin_unlock(&osb->node_map_lock);
return ret;
}
static void __ocfs2_node_map_set(struct ocfs2_node_map *target,
struct ocfs2_node_map *from)
{
int num_longs, i;
BUG_ON(target->num_nodes != from->num_nodes);
BUG_ON(target->num_nodes == 0);
num_longs = BITS_TO_LONGS(target->num_nodes);
for (i = 0; i < num_longs; i++)
target->map[i] = from->map[i];
}
/* Returns whether the recovery bit was actually set - it may not be
* if a node is still marked as needing recovery */
int ocfs2_recovery_map_set(struct ocfs2_super *osb,
int num)
{
int set = 0;
spin_lock(&osb->node_map_lock);
__ocfs2_node_map_clear_bit(&osb->mounted_map, num);
if (!test_bit(num, osb->recovery_map.map)) {
__ocfs2_node_map_set_bit(&osb->recovery_map, num);
set = 1;
}
spin_unlock(&osb->node_map_lock);
return set;
}
void ocfs2_recovery_map_clear(struct ocfs2_super *osb,
int num)
{
ocfs2_node_map_clear_bit(osb, &osb->recovery_map, num);
}
int ocfs2_node_map_iterate(struct ocfs2_super *osb,
struct ocfs2_node_map *map,
int idx)
{
int i = idx;
idx = O2NM_INVALID_NODE_NUM;
spin_lock(&osb->node_map_lock);
if ((i != O2NM_INVALID_NODE_NUM) &&
(i >= 0) &&
(i < map->num_nodes)) {
while(i < map->num_nodes) {
if (test_bit(i, map->map)) {
idx = i;
break;
}
i++;
}
}
spin_unlock(&osb->node_map_lock);
return idx;
}
