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	#!/bin/bash
	# Copyright (c) 2005,2008 Oracle
	# Copyright (c) 2008 Andrew Beekhof
	# All Rights Reserved.
	#
	# This program is free software; you can redistribute it and/or modify
	# it under the terms of version 2 of the GNU General Public License as
	# published by the Free Software Foundation.
	#
	# This program is distributed in the hope that it would be useful, but
	# WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	#
	# Further, this software is distributed without any warranty that it is
	# free of the rightful claim of any third person regarding infringement
	# or the like. Any license provided herein, whether implied or
	# otherwise, applies only to this software file. Patent licenses, if
	# any, provided herein do not apply to combinations of this program with
	# other software, or any other product whatsoever.
	#
	#######################################################################

	: ${OCF_FUNCTIONS=${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs}
	. ${OCF_FUNCTIONS}
	: ${__OCF_ACTION=$1}

	: ${OCF_RESKEY_stack:="pcmk"}
	: ${OCF_RESKEY_sysfs:="/sys/fs"}
	: ${OCF_RESKEY_configfs:="/sys/kernel/config"}
	: ${OCF_RESKEY_daemon_timeout:="10"} # How long to wait for things to start
	: ${OCF_RESKEY_CRM_meta_globally_unique:="false"}

	DAEMON="/usr/sbin/ocfs2_controld.${OCF_RESKEY_stack}"
	CLUSTER_STACK_FILE="${OCF_RESKEY_sysfs}/ocfs2/cluster_stack"
	LOADED_PLUGINS_FILE="${OCF_RESKEY_sysfs}/ocfs2/loaded_cluster_plugins"

	#
	# Check to see if a filesystem driver is loaded.
	# 0 is loaded, 1 is not.
	#
	driver_filesystem() {
	if [ -z "$1" ]
	then
	ocf_log err "driver_filesystem(): Missing an argument"
	exit 1
	fi
	FSNAME="$1"

	FSOUT="$(awk '(NF == 1 && $1 ~ /^'$FSNAME'$/) \|\| $2 ~ /^'$FSNAME'$/{
	print $1;exit
	}' /proc/filesystems 2>/dev/null)"

	test -n "$FSOUT"
	return $?
	}

	#
	# Check to see if a filesystem of type $1 is mounted at $2.
	#
	# 0 is mounted, 1 is not.
	#
	check_filesystem()
	{
	if [ "$#" != "2" -o -z "$1" -o -z "$2" ]
	then
	ocf_log err "check_filesystem(): Missing arguments"
	exit 4
	fi
	FSNAME="$1"
	MOUNTPOINT="$2"

	FULL_MOUNTSEARCH="`echo "$MOUNTPOINT" \| sed -e 's/\//\\\\\//g'`"
	MOUNTOUT="`awk '$2 ~ /^'$FULL_MOUNTSEARCH'$/ && $3 ~ /^'$FSNAME'$/{print $2; exit}' < /proc/mounts 2>/dev/null`"
	test -n "$MOUNTOUT"
	return $?
	}

	#
	# Unload a filesystem driver.
	# Be careful to notice if the driver is built-in and do nothing.
	#
	# 0 is success, 1 is error, 2 is already unloaded.
	#
	unload_filesystem()
	{
	if [ "$#" != "1" -o -z "$1" ]
	then
	ocf_log err "unload_filesystem(): Missing an argument"
	return 1
	fi
	FSNAME="$1"

	driver_filesystem "$FSNAME" \|\| return 2

	MODOUT="`awk '$1 ~ /^'$FSNAME'$/{print $1,$3;exit}' < /proc/modules 2>/dev/null`"
	if [ -z "$MODOUT" ]; then
	# The driver is built in, we can't unload it.
	return 0
	fi

	case "$MODOUT" in
	$FSNAME\ 0)
	;;
	$FSNAME\ *)
	# The driver is busy, leave it alone
	ocf_log err "Module $FSNAME is still in use"
	return 1
	;;
	*)
	ocf_log err "Invalid module parsing! "
	return 1
	;;
	esac

	modprobe -rs "$FSNAME"
	if [ "$?" != 0 ]; then
	ocf_log err "Unable to unload module: $FSNAME"
	return 1
	fi

	return 0
	}

	status_daemon()
	{
	PID=`pidof "$DAEMON"`
	if [ -n "$PID" ]; then
	return $OCF_SUCCESS
	fi
	return $OCF_NOT_RUNNING
	}

	bringup_daemon()
	{
	if [ ! -e "$DAEMON" ]; then
	ocf_log err "Required binary not found: $DAEMON"
	return $OCF_ERR_INSTALLED
	fi

	"$DAEMON"; rc=$?
	if [ $rc != 0 ]; then
	ocf_log err "Could not start $DAEMON"
	return $OCF_ERR_GENERIC
	fi

	sleep 1
	COUNT=0
	rc=$OCF_NOT_RUNNING

	while [ $rc = $OCF_NOT_RUNNING ]; do
	COUNT=`expr $COUNT + 1`
	if [ $COUNT -gt $OCF_RESKEY_daemon_timeout ]; then
	ocf_log err "`basename $DAEMON` did not come up"
	return $OCF_ERR_GENERIC
	fi
	status_daemon; rc=$?
	sleep 1
	done

	return $rc
	}

	kill_daemon()
	{
	status_daemon; rc=$?
	if [ $rc != $OCF_SUCCESS ]; then
	return $rc
	fi

	ocf_log info "Stopping `basename "$DAEMON"`"
	killproc "$DAEMON"

	while [ $rc = $OCF_NOT_RUNNING ]; do
	sleep 1
	status_daemon; rc=$?
	done

	return $OCF_SUCCESS
	}

	#
	# Unload a module
	# 0 is success, 1 is error, 2 is not loaded
	#
	unload_module()
	{
	if [ "$#" -lt "1" -o -z "$1" ]
	then
	ocf_log err "unload_module(): Requires an argument"
	return 1
	fi
	MODNAME="$1"

	MODOUT="`awk '$1 ~ /^'$MODNAME'$/{print $1,$3;exit}' < /proc/modules 2>/dev/null`"
	if [ -z "$MODOUT" ]
	then
	return 2
	fi

	case "$MODOUT" in
	$MODNAME\ 0)
	;;
	$MODNAME\ *)
	return 2
	;;
	*)
	ocf_log err "Invalid module parsing!"
	return 1
	;;
	esac

	modprobe -rs "$MODNAME"
	if [ "$?" != 0 ]; then
	ocf_log err "Unable to unload module \"$MODNAME\""
	return 1
	fi

	return 0
	}

	o2cb_start() {

	o2cb_monitor; rc=$?
	if [ $rc != $OCF_NOT_RUNNING ]; then
	return $rc
	fi

	ocf_log info "Starting $OCF_RESOURCE_INSTANCE"

	if [ ! -e "$CLUSTER_STACK_FILE" ]; then
	modprobe -s ocfs2_stackglue
	if [ $? != 0 ]; then
	ocf_log err "Could not load ocfs2_stackglue"
	return $OCF_ERR_INSTALLED
	fi
	fi

	SP_OUT="$(awk '/^'user'$/{print; exit}' "$LOADED_PLUGINS_FILE" 2>/dev/null)"
	if [ -z "$SP_OUT" ]
	then
	modprobe -s ocfs2_stack_user
	if [ $? != 0 ]; then
	ocf_log err "Could not load ocfs2_stack_user"
	return $OCF_ERR_INSTALLED
	fi
	fi

	SP_OUT="$(awk '/^'user'$/{print; exit}' "$LOADED_PLUGINS_FILE" 2>/dev/null)"
	if [ -z "$SP_OUT" ]; then
	ocf_log err "Switch to userspace stack unsuccessful"
	return $OCF_ERR_INSTALLED
	fi

	if [ -f "$CLUSTER_STACK_FILE" ]; then
	echo "$OCF_RESKEY_stack" >"$CLUSTER_STACK_FILE"
	if [ $? != 0 ]; then
	ocf_log err "Userspace stack '$OCF_RESKEY_stack' not supported"
	return $OCF_ERR_INSTALLED
	fi
	else
	ocf_log err "Switch to userspace stack not supported"
	return $OCF_ERR_INSTALLED
	fi

	driver_filesystem ocfs2; rc=$?
	if [ $rc != 0 ]; then
	modprobe -s ocfs2
	if [ "$?" != 0 ]; then
	ocf_log err "Unable to load ocfs2 module"
	return $OCF_ERR_INSTALLED
	fi
	fi

	bringup_daemon
	return $?
	}

	o2cb_stop() {
	o2cb_monitor; rc=$?
	case $rc in
	$OCF_NOT_RUNNING) return $OCF_SUCCESS;;
	esac

	ocf_log info "Stopping $OCF_RESOURCE_INSTANCE"

	kill_daemon
	if [ $? != 0 ]; then
	ocf_log err "Unable to unload modules: the cluster is still online"
	return $OCF_ERR_GENERIC
	fi

	unload_filesystem ocfs2
	if [ $? = 1 ]; then
	ocf_log err "Unable to unload ocfs2 module"
	return $OCF_ERR_GENERIC
	fi

	# If we can't find the stack glue, we have nothing to do.
	[ ! -e "$LOADED_PLUGINS_FILE" ] && return $OCF_SUCCESS

	while read plugin
	do
	unload_module "ocfs2_stack_${plugin}"
	if [ $? = 1 ]; then
	ocf_log err "Unable to unload ocfs2_stack_${plugin}"
	return $OCF_ERR_GENERIC
	fi
	done <"$LOADED_PLUGINS_FILE"

	unload_module "ocfs2_stackglue"
	if [ $? = 1 ]; then
	ocf_log err "Unable to unload ocfs2_stackglue"
	return $OCF_ERR_GENERIC
	fi

	# Don't unmount configfs - it's always in use by libdlm
	}

	o2cb_monitor() {
	o2cb_validate

	# Assume that ocfs2_controld will terminate if any of the conditions below are met

	driver_filesystem configfs; rc=$?
	if [ $rc != 0 ]; then
	ocf_log info "configfs not loaded"
	return $OCF_NOT_RUNNING
	fi

	check_filesystem configfs "${OCF_RESKEY_configfs}"; rc=$?
	if [ $rc != 0 ]; then
	ocf_log info "configfs not mounted"
	return $OCF_NOT_RUNNING
	fi

	if [ ! -e "$LOADED_PLUGINS_FILE" ]; then
	ocf_log info "Stack glue driver not loaded"
	return $OCF_NOT_RUNNING
	fi

	grep user "$LOADED_PLUGINS_FILE" >/dev/null 2>&1; rc=$?
	if [ $rc != 0 ]; then
	ocf_log err "Wrong stack `cat $LOADED_PLUGINS_FILE`"
	return $OCF_ERR_INSTALLED
	fi

	driver_filesystem ocfs2; rc=$?
	if [ $rc != 0 ]; then
	ocf_log info "ocfs2 not loaded"
	return $OCF_NOT_RUNNING
	fi

	status_daemon
	return $?
	}

	o2cb_usage() {
	echo "usage: $0 {start\|stop\|monitor\|validate-all\|meta-data}"
	echo " Expects to have a fully populated OCF RA-compliant environment set."
	echo " In particualr, a value for OCF_ROOT"
	}

	o2cb_validate() {
	check_binary ${DAEMON}

	case ${OCF_RESKEY_CRM_meta_globally_unique} in
	yes\|Yes\|true\|True\|1)
	ocf_log err "$OCF_RESOURCE_INSTANCE must be configured with the globally_unique=false meta attribute"
	exit $OCF_ERR_CONFIGURED
	;;
	esac

	return $OCF_SUCCESS
	}

	meta_data() {
	cat <<END
	<?xml version="1.0"?>
	<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
	<resource-agent name="o2cb" version="1.0">
	<version>1.0</version>
	<shortdesc lang="en">OCFS2 daemon resource agent</shortdesc>
	<longdesc lang="en">
	This Resource Agent controls the userspace daemon needed by OCFS2.
	</longdesc>
	<parameters>

	<parameter name="sysfs" unique="0">
	<longdesc lang="en">
	Location where sysfs is mounted
	</longdesc>
	<shortdesc lang="en">Sysfs location</shortdesc>
	<content type="string" default="/sys/fs"/>
	</parameter>

	<parameter name="configfs" unique="0">
	<longdesc lang="en">
	Location where configfs is mounted
	</longdesc>
	<shortdesc lang="en">Configfs location</shortdesc>
	<content type="string" default="/sys/kernel/config"/>
	</parameter>

	<parameter name="stack" unique="0">
	<longdesc lang="en">
	Which userspace stack to use. Known values: pcmk
	</longdesc>
	<shortdesc lang="en">Userspace stack</shortdesc>
	<content type="string" default="pcmk"/>
	</parameter>

	<parameter name="daemon_timeout" unique="0">
	<longdesc lang="en">
	Number of seconds to allow the control daemon to come up
	</longdesc>
	<shortdesc lang="en">Daemon Timeout</shortdesc>
	<content type="string" default="10"/>
	</parameter>

	</parameters>
	<actions>
	<action name="start" timeout="90" />
	<action name="stop" timeout="100" />
	<action name="monitor" timeout="20" depth="0"/>
	<action name="meta-data" timeout="5" />
	<action name="validate-all" timeout="30" />
	</actions>
	</resource-agent>
	END
	}

	case $__OCF_ACTION in
	meta-data) meta_data
	exit $OCF_SUCCESS
	;;
	start) o2cb_start
	;;
	stop) o2cb_stop
	;;
	monitor) o2cb_monitor
	;;
	validate-all) o2cb_validate
	;;
	usage\|help) o2cb_usage
	exit $OCF_SUCCESS
	;;
	*) o2cb_usage
	exit $OCF_ERR_UNIMPLEMENTED
	;;
	esac

	exit $?

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