quorum.c
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quorum.c
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	/*
	* Copyright (c) 2008-2012 Red Hat, Inc.
	*
	* All rights reserved.
	*
	* Author: Christine Caulfield (ccaulfie@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 CONTRIBUTORS "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.
	*/
	/*
	* Provides a quorum API using the corosync executive
	*/

	#include <config.h>

	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <errno.h>

	#include <qb/qbipcc.h>
	#include <corosync/corotypes.h>
	#include <corosync/corodefs.h>
	#include <corosync/hdb.h>

	#include <corosync/quorum.h>
	#include <corosync/ipc_quorum.h>

	#include "util.h"

	struct quorum_inst {
	qb_ipcc_connection_t *c;
	int finalize;
	const void *context;
	quorum_callbacks_t callbacks;
	};

	DECLARE_HDB_DATABASE(quorum_handle_t_db,NULL);

	cs_error_t quorum_initialize (
	quorum_handle_t *handle,
	quorum_callbacks_t *callbacks,
	uint32_t *quorum_type)
	{
	cs_error_t error;
	struct quorum_inst *quorum_inst;
	struct iovec iov;
	struct qb_ipc_request_header req;
	struct res_lib_quorum_gettype res_lib_quorum_gettype;

	error = hdb_error_to_cs(hdb_handle_create (&quorum_handle_t_db, sizeof (struct quorum_inst), handle));
	if (error != CS_OK) {
	goto error_no_destroy;
	}

	error = hdb_error_to_cs(hdb_handle_get (&quorum_handle_t_db, handle, (void )&quorum_inst));
	if (error != CS_OK) {
	goto error_destroy;
	}

	error = CS_OK;
	quorum_inst->c = qb_ipcc_connect ("quorum", IPC_REQUEST_SIZE);
	if (quorum_inst->c == NULL) {
	error = qb_to_cs_error(-errno);
	goto error_put_destroy;
	}

	req.size = sizeof (req);
	req.id = MESSAGE_REQ_QUORUM_GETTYPE;

	iov.iov_base = (char *)&req;
	iov.iov_len = sizeof (req);

	error = qb_to_cs_error(qb_ipcc_sendv_recv (
	quorum_inst->c,
	&iov,
	1,
	&res_lib_quorum_gettype,
	sizeof (struct res_lib_quorum_gettype), -1));

	if (error != CS_OK) {
	goto error_put_destroy;
	}

	error = res_lib_quorum_gettype.header.error;

	*quorum_type = res_lib_quorum_gettype.quorum_type;

	if (callbacks)
	memcpy(&quorum_inst->callbacks, callbacks, sizeof (*callbacks));
	else
	memset(&quorum_inst->callbacks, 0, sizeof (*callbacks));

	(void)hdb_handle_put (&quorum_handle_t_db, *handle);

	return (CS_OK);

	error_put_destroy:
	(void)hdb_handle_put (&quorum_handle_t_db, *handle);
	error_destroy:
	(void)hdb_handle_destroy (&quorum_handle_t_db, *handle);
	error_no_destroy:
	return (error);
	}

	cs_error_t quorum_finalize (
	quorum_handle_t handle)
	{
	struct quorum_inst *quorum_inst;
	cs_error_t error;

	error = hdb_error_to_cs(hdb_handle_get (&quorum_handle_t_db, handle, (void *)&quorum_inst));
	if (error != CS_OK) {
	return (error);
	}

	/*
	* Another thread has already started finalizing
	*/
	if (quorum_inst->finalize) {
	(void)hdb_handle_put (&quorum_handle_t_db, handle);
	return (CS_ERR_BAD_HANDLE);
	}

	quorum_inst->finalize = 1;

	qb_ipcc_disconnect (quorum_inst->c);

	(void)hdb_handle_destroy (&quorum_handle_t_db, handle);

	(void)hdb_handle_put (&quorum_handle_t_db, handle);

	return (CS_OK);
	}

	cs_error_t quorum_getquorate (
	quorum_handle_t handle,
	int *quorate)
	{
	cs_error_t error;
	struct quorum_inst *quorum_inst;
	struct iovec iov;
	struct qb_ipc_request_header req;
	struct res_lib_quorum_getquorate res_lib_quorum_getquorate;

	error = hdb_error_to_cs(hdb_handle_get (&quorum_handle_t_db, handle, (void *)&quorum_inst));
	if (error != CS_OK) {
	return (error);
	}

	req.size = sizeof (req);
	req.id = MESSAGE_REQ_QUORUM_GETQUORATE;

	iov.iov_base = (char *)&req;
	iov.iov_len = sizeof (req);

	error = qb_to_cs_error(qb_ipcc_sendv_recv (
	quorum_inst->c,
	&iov,
	1,
	&res_lib_quorum_getquorate,
	sizeof (struct res_lib_quorum_getquorate), CS_IPC_TIMEOUT_MS));

	if (error != CS_OK) {
	goto error_exit;
	}

	error = res_lib_quorum_getquorate.header.error;

	*quorate = res_lib_quorum_getquorate.quorate;

	error_exit:
	(void)hdb_handle_put (&quorum_handle_t_db, handle);

	return (error);
	}

	cs_error_t quorum_fd_get (
	quorum_handle_t handle,
	int *fd)
	{
	cs_error_t error;
	struct quorum_inst *quorum_inst;

	error = hdb_error_to_cs(hdb_handle_get (&quorum_handle_t_db, handle, (void *)&quorum_inst));
	if (error != CS_OK) {
	return (error);
	}

	error = qb_to_cs_error(qb_ipcc_fd_get (quorum_inst->c, fd));

	(void)hdb_handle_put (&quorum_handle_t_db, handle);

	return (error);
	}


	cs_error_t quorum_context_get (
	quorum_handle_t handle,
	const void **context)
	{
	cs_error_t error;
	struct quorum_inst *quorum_inst;

	error = hdb_error_to_cs(hdb_handle_get (&quorum_handle_t_db, handle, (void *)&quorum_inst));
	if (error != CS_OK) {
	return (error);
	}

	*context = quorum_inst->context;

	(void)hdb_handle_put (&quorum_handle_t_db, handle);

	return (CS_OK);
	}

	cs_error_t quorum_context_set (
	quorum_handle_t handle,
	const void *context)
	{
	cs_error_t error;
	struct quorum_inst *quorum_inst;

	error = hdb_error_to_cs(hdb_handle_get (&quorum_handle_t_db, handle, (void *)&quorum_inst));
	if (error != CS_OK) {
	return (error);
	}

	quorum_inst->context = context;

	(void)hdb_handle_put (&quorum_handle_t_db, handle);

	return (CS_OK);
	}


	cs_error_t quorum_trackstart (
	quorum_handle_t handle,
	unsigned int flags )
	{
	cs_error_t error;
	struct quorum_inst *quorum_inst;
	struct iovec iov;
	struct req_lib_quorum_trackstart req_lib_quorum_trackstart;
	struct qb_ipc_response_header res;

	error = hdb_error_to_cs(hdb_handle_get (&quorum_handle_t_db, handle, (void *)&quorum_inst));
	if (error != CS_OK) {
	return (error);
	}

	req_lib_quorum_trackstart.header.size = sizeof (struct req_lib_quorum_trackstart);
	req_lib_quorum_trackstart.header.id = MESSAGE_REQ_QUORUM_TRACKSTART;
	req_lib_quorum_trackstart.track_flags = flags;

	iov.iov_base = (char *)&req_lib_quorum_trackstart;
	iov.iov_len = sizeof (struct req_lib_quorum_trackstart);

	error = qb_to_cs_error(qb_ipcc_sendv_recv (
	quorum_inst->c,
	&iov,
	1,
	&res,
	sizeof (res), CS_IPC_TIMEOUT_MS));

	if (error != CS_OK) {
	goto error_exit;
	}

	error = res.error;

	error_exit:
	(void)hdb_handle_put (&quorum_handle_t_db, handle);

	return (error);
	}

	cs_error_t quorum_trackstop (
	quorum_handle_t handle)
	{
	cs_error_t error;
	struct quorum_inst *quorum_inst;
	struct iovec iov;
	struct qb_ipc_request_header req;
	struct qb_ipc_response_header res;

	error = hdb_error_to_cs(hdb_handle_get (&quorum_handle_t_db, handle, (void *)&quorum_inst));
	if (error != CS_OK) {
	return (error);
	}

	req.size = sizeof (req);
	req.id = MESSAGE_REQ_QUORUM_TRACKSTOP;

	iov.iov_base = (char *)&req;
	iov.iov_len = sizeof (req);

	error = qb_to_cs_error(qb_ipcc_sendv_recv (
	quorum_inst->c,
	&iov,
	1,
	&res,
	sizeof (res), CS_IPC_TIMEOUT_MS));

	if (error != CS_OK) {
	goto error_exit;
	}

	error = res.error;

	error_exit:
	(void)hdb_handle_put (&quorum_handle_t_db, handle);

	return (error);
	}

	cs_error_t quorum_dispatch (
	quorum_handle_t handle,
	cs_dispatch_flags_t dispatch_types)
	{
	int timeout = -1;
	cs_error_t error;
	int cont = 1; /* always continue do loop except when set to 0 */
	struct quorum_inst *quorum_inst;
	quorum_callbacks_t callbacks;
	struct qb_ipc_response_header *dispatch_data;
	char dispatch_buf[IPC_DISPATCH_SIZE];
	struct res_lib_quorum_notification *res_lib_quorum_notification;

	if (dispatch_types != CS_DISPATCH_ONE &&
	dispatch_types != CS_DISPATCH_ALL &&
	dispatch_types != CS_DISPATCH_BLOCKING &&
	dispatch_types != CS_DISPATCH_ONE_NONBLOCKING) {

	return (CS_ERR_INVALID_PARAM);
	}

	error = hdb_error_to_cs(hdb_handle_get (&quorum_handle_t_db, handle,
	(void *)&quorum_inst));
	if (error != CS_OK) {
	return (error);
	}

	/*
	* Timeout instantly for CS_DISPATCH_ONE_NONBLOCKING or CS_DISPATCH_ALL and
	* wait indefinately for CS_DISPATCH_ONE or CS_DISPATCH_BLOCKING
	*/
	if (dispatch_types == CS_DISPATCH_ALL \|\| dispatch_types == CS_DISPATCH_ONE_NONBLOCKING) {
	timeout = 0;
	}

	dispatch_data = (struct qb_ipc_response_header *)dispatch_buf;
	do {
	error = qb_to_cs_error (qb_ipcc_event_recv (
	quorum_inst->c,
	dispatch_buf,
	IPC_DISPATCH_SIZE,
	timeout));
	if (error == CS_ERR_BAD_HANDLE) {
	error = CS_OK;
	goto error_put;
	}
	if (error == CS_ERR_TRY_AGAIN) {
	if (dispatch_types == CS_DISPATCH_ONE_NONBLOCKING) {
	/*
	* Don't mask error
	*/
	goto error_put;
	}
	error = CS_OK;
	if (dispatch_types == CS_DISPATCH_ALL) {
	break; /* exit do while cont is 1 loop */
	} else {
	continue; /* next poll */
	}
	}
	if (error != CS_OK) {
	goto error_put;
	}

	/*
	* Make copy of callbacks, message data, unlock instance, and call callback
	* A risk of this dispatch method is that the callback routines may
	* operate at the same time that quorum_finalize has been called in another thread.
	*/
	memcpy (&callbacks, &quorum_inst->callbacks, sizeof (quorum_callbacks_t));
	/*
	* Dispatch incoming message
	*/
	switch (dispatch_data->id) {

	case MESSAGE_RES_QUORUM_NOTIFICATION:
	if (callbacks.quorum_notify_fn == NULL) {
	break;
	}
	res_lib_quorum_notification = (struct res_lib_quorum_notification *)dispatch_data;

	callbacks.quorum_notify_fn ( handle,
	res_lib_quorum_notification->quorate,
	res_lib_quorum_notification->ring_seq,
	res_lib_quorum_notification->view_list_entries,
	res_lib_quorum_notification->view_list);
	break;

	default:
	error = CS_ERR_LIBRARY;
	goto error_put;
	break;
	}

	/*
	* Determine if more messages should be processed
	*/
	if (dispatch_types == CS_DISPATCH_ONE \|\| dispatch_types == CS_DISPATCH_ONE_NONBLOCKING) {
	cont = 0;
	}
	} while (cont);

	goto error_put;

	error_put:
	(void)hdb_handle_put (&quorum_handle_t_db, handle);
	return (error);
	}

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