[PATCH] OCFS2: The Second Oracle Cluster Filesystem

/* -*- mode: c; c-basic-offset: 8; -*-

 * vim: noexpandtab sw=8 ts=8 sts=0:

 *

 * heartbeat.h

 *

 * Function prototypes

 *

 * Copyright (C) 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.

 *

 */

#ifndef O2CLUSTER_HEARTBEAT_H

#define O2CLUSTER_HEARTBEAT_H

#include "ocfs2_heartbeat.h"

#define O2HB_REGION_TIMEOUT_MS		2000

/* number of changes to be seen as live */

#define O2HB_LIVE_THRESHOLD	   2

/* number of equal samples to be seen as dead */

extern unsigned int o2hb_dead_threshold;

#define O2HB_DEFAULT_DEAD_THRESHOLD	   7

/* Otherwise MAX_WRITE_TIMEOUT will be zero... */

#define O2HB_MIN_DEAD_THRESHOLD	  2

#define O2HB_MAX_WRITE_TIMEOUT_MS (O2HB_REGION_TIMEOUT_MS * (o2hb_dead_threshold - 1))

#define O2HB_CB_MAGIC		0x51d1e4ec

/* callback stuff */

enum o2hb_callback_type {

	O2HB_NODE_DOWN_CB = 0,

	O2HB_NODE_UP_CB,

	O2HB_NUM_CB

};

struct o2nm_node;

typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *);

struct o2hb_callback_func {

	u32			hc_magic;

	struct list_head	hc_item;

	o2hb_cb_func		*hc_func;

	void			*hc_data;

	int			hc_priority;

	enum o2hb_callback_type hc_type;

};

struct config_group *o2hb_alloc_hb_set(void);

void o2hb_free_hb_set(struct config_group *group);

void o2hb_setup_callback(struct o2hb_callback_func *hc,

			 enum o2hb_callback_type type,

			 o2hb_cb_func *func,

			 void *data,

			 int priority);

int o2hb_register_callback(struct o2hb_callback_func *hc);

int o2hb_unregister_callback(struct o2hb_callback_func *hc);

void o2hb_fill_node_map(unsigned long *map,

			unsigned bytes);

void o2hb_init(void);

int o2hb_check_node_heartbeating(u8 node_num);

int o2hb_check_node_heartbeating_from_callback(u8 node_num);

int o2hb_check_local_node_heartbeating(void);

void o2hb_stop_all_regions(void);

#endif /* O2CLUSTER_HEARTBEAT_H */

/* -*- mode: c; c-basic-offset: 8; -*-

 * vim: noexpandtab sw=8 ts=8 sts=0:

 *

 * ocfs2_heartbeat.h

 *

 * On-disk structures for ocfs2_heartbeat

 *

 * 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.

 */

#ifndef _OCFS2_HEARTBEAT_H

#define _OCFS2_HEARTBEAT_H

struct o2hb_disk_heartbeat_block {

	__le64 hb_seq;

	__u8  hb_node;

	__u8  hb_pad1[3];

	__le32 hb_cksum;

	__le64 hb_generation;

};

#endif /* _OCFS2_HEARTBEAT_H */