include/corosync/votequorum.h

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/*
 * Copyright (c) 2009-2012 Red Hat, Inc.
 *
 * All rights reserved.
 *
 * Authors: Christine Caulfield (ccaulfie@redhat.com)
 *          Fabio M. Di Nitto   (fdinitto@redhat.com)
 *
 * This software licensed under BSD license, the text of which follows:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of the MontaVista Software, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef COROSYNC_VOTEQUORUM_H_DEFINED
#define COROSYNC_VOTEQUORUM_H_DEFINED
 
#include <corosync/corotypes.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef uint64_t votequorum_handle_t;
 
#define VOTEQUORUM_INFO_TWONODE                  1
#define VOTEQUORUM_INFO_QUORATE                  2
#define VOTEQUORUM_INFO_WAIT_FOR_ALL             4
#define VOTEQUORUM_INFO_LAST_MAN_STANDING        8
#define VOTEQUORUM_INFO_AUTO_TIE_BREAKER         16
#define VOTEQUORUM_INFO_ALLOW_DOWNSCALE          32
#define VOTEQUORUM_INFO_QDEVICE_REGISTERED       64
#define VOTEQUORUM_INFO_QDEVICE_ALIVE            128
#define VOTEQUORUM_INFO_QDEVICE_CAST_VOTE        256
#define VOTEQUORUM_INFO_QDEVICE_MASTER_WINS      512
 
#define VOTEQUORUM_QDEVICE_NODEID                0
#define VOTEQUORUM_QDEVICE_MAX_NAME_LEN          255
#define VOTEQUORUM_QDEVICE_DEFAULT_TIMEOUT       10000
#define VOTEQUORUM_QDEVICE_DEFAULT_SYNC_TIMEOUT  30000
 
#define VOTEQUORUM_NODESTATE_MEMBER              1
#define VOTEQUORUM_NODESTATE_DEAD                2
#define VOTEQUORUM_NODESTATE_LEAVING             3
 
struct votequorum_info {
        unsigned int node_id;
        unsigned int node_state;
        unsigned int node_votes;
        unsigned int node_expected_votes;
        unsigned int highest_expected;
        unsigned int total_votes;
        unsigned int quorum;
        unsigned int flags;
        unsigned int qdevice_votes;
        char qdevice_name[VOTEQUORUM_QDEVICE_MAX_NAME_LEN];
};
 
typedef struct {
        uint32_t nodeid;
        uint32_t state;
} votequorum_node_t;
 
typedef struct {
        uint32_t nodeid;
        uint64_t seq;
} votequorum_ring_id_t;
 
typedef void (*votequorum_quorum_notification_fn_t) (
        votequorum_handle_t handle,
        uint64_t context,
        uint32_t quorate,
        uint32_t node_list_entries,
        votequorum_node_t node_list[]);
 
typedef void (*votequorum_nodelist_notification_fn_t) (
        votequorum_handle_t handle,
        uint64_t context,
        votequorum_ring_id_t ring_id,
        uint32_t node_list_entries,
        uint32_t node_list[]);
 
typedef void (*votequorum_expectedvotes_notification_fn_t) (
        votequorum_handle_t handle,
        uint64_t context,
        uint32_t expected_votes);
 
typedef struct {
        votequorum_quorum_notification_fn_t votequorum_quorum_notify_fn;
        votequorum_expectedvotes_notification_fn_t votequorum_expectedvotes_notify_fn;
        votequorum_nodelist_notification_fn_t votequorum_nodelist_notify_fn;
} votequorum_callbacks_t;
 
cs_error_t votequorum_initialize (
        votequorum_handle_t *handle,
        votequorum_callbacks_t *callbacks);
 
cs_error_t votequorum_finalize (
        votequorum_handle_t handle);
 
cs_error_t votequorum_dispatch (
        votequorum_handle_t handle,
        cs_dispatch_flags_t dispatch_types);
 
cs_error_t votequorum_fd_get (
        votequorum_handle_t handle,
        int *fd);
 
cs_error_t votequorum_getinfo (
        votequorum_handle_t handle,
        unsigned int nodeid,
        struct votequorum_info *info);
 
cs_error_t votequorum_setexpected (
        votequorum_handle_t handle,
        unsigned int expected_votes);
 
cs_error_t votequorum_setvotes (
        votequorum_handle_t handle,
        unsigned int nodeid,
        unsigned int votes);
 
cs_error_t votequorum_trackstart (
        votequorum_handle_t handle,
        uint64_t context,
        unsigned int flags);
 
cs_error_t votequorum_trackstop (
        votequorum_handle_t handle);
 
cs_error_t votequorum_context_get (
        votequorum_handle_t handle,
        void **context);
 
cs_error_t votequorum_context_set (
        votequorum_handle_t handle,
        void *context);
 
cs_error_t votequorum_qdevice_register (
        votequorum_handle_t handle,
        const char *name);
 
cs_error_t votequorum_qdevice_unregister (
        votequorum_handle_t handle,
        const char *name);
 
cs_error_t votequorum_qdevice_update (
        votequorum_handle_t handle,
        const char *oldname,
        const char *newname);
 
cs_error_t votequorum_qdevice_poll (
        votequorum_handle_t handle,
        const char *name,
        unsigned int cast_vote,
        votequorum_ring_id_t ring_id);
 
cs_error_t votequorum_qdevice_master_wins (
        votequorum_handle_t handle,
        const char *name,
        unsigned int allow);
 
#ifdef __cplusplus
}
#endif
#endif /* COROSYNC_VOTEQUORUM_H_DEFINED */