File: sg_persist

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#!/bin/bash
#
#
#   OCF Resource Agent compliant PERSISTENT SCSI RESERVATION resource script.
#
#
# Copyright (c) 2011 Evgeny Nifontov and lwang@suse.com All Rights Reserved.
#
# "Heartbeat drbd OCF Resource Agent: 2007, Lars Marowsky-Bree" was used 
# as example of multistate OCF Resource Agent.
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#
#
# OCF instance parameters
#    OCF_RESKEY_binary
#    OCF_RESKEY_devs
#    OCF_RESKEY_required_devs_nof
#    OCF_RESKEY_reservation_type
#    OCF_RESKEY_master_score_base
#    OCF_RESKEY_master_score_dev_factor
#    OCF_RESKEY_master_score_delay
#
# TODO
# 
# 1) PROBLEM: devices which were not accessible during 'start' action, will be never registered/reserved 
#    TODO:    'Master' and 'Salve' registers new devs in 'monitor' action
#    TODO:    'Master' reserves new devs in 'monitor' action

#######################################################################
# Initialization:

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs

# set default values
    : ${sg_persist_binary="sg_persist"}     # binary name for the resource
    : ${devs=""}                            # device list
    : ${required_devs_nof=1}                # number of required devices
    : ${reservation_type=1}                 # reservation type
    : ${master_score_base=0}                # master score base 
    : ${master_score_dev_factor=100}        # device factor for master score
    : ${master_score_delay=30}              # delay for master score

#######################################################################


meta_data() {
    cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="sg_persist">
<version>1.1</version>

<longdesc lang="en">
This resource agent manages SCSI PERSISTENT RESERVATIONS.
"sg_persist" from sg3_utils is used, please see its documentation.
Should be used as multistate (Master/Slave) resource
Slave registers its node id ("crm_node -i") as reservation key ( --param-rk ) on each device in the "devs" list.
Master reservs all devices from "devs" list with reservation "--prout-type" value from "reservation_type" parameter.
</longdesc>
<shortdesc lang="en">Manages SCSI PERSISTENT RESERVATIONS</shortdesc>

<parameters>
<parameter name="binary" unique="0">
<longdesc lang="en">
The name of the binary that manages the resource.
</longdesc>
<shortdesc lang="en">the binary name of the resource</shortdesc>
<content type="string" default="$sg_persist_binary"/>
</parameter>

<parameter name="devs" unique="0" required="1">
<longdesc lang="en">
Device list. Multiple devices can be listed with blank space as separator. 
Shell wildcars are allowed.
</longdesc>
<shortdesc lang="en">device list</shortdesc>
<content type="string"/>
</parameter>

<parameter name="required_devs_nof" unique="0" required="0">
<longdesc lang="en">
Minimum number of "working" devices from device list
      1) existing 
      2) "sg_persist --read-keys \$device" works (Return code 0)
resource actions "start","monitor","promote" and "validate-all" return "\$OCF_ERR_INSTALLED"
if the actual number of "working" devices is less then "required_devs_nof".
resource actions "stop" and "demote" tries to remove reservations and registration keys from 
all working devices, but always return "\$OCF_SUCCESS"
</longdesc>
<shortdesc lang="en">minimum number of working devices</shortdesc>
<content type="string" default="1"/>
</parameter>

<parameter name="reservation_type" unique="0" required="0">
<longdesc lang="en">
reservation type 
</longdesc>
<shortdesc lang="en">reservation type</shortdesc>
<content type="string" default="1" />
</parameter>

<parameter name="master_score_base" unique="0" required="0">
<longdesc lang="en">
master_score_base value
"master_score_base" value is used in "master_score" calculation:
master_score = \$master_score_base + \$master_score_dev_factor * \$working_devs  
if set to bigger value in sg_persist resource configuration on some node, this node will be "preferred" for master role. 
</longdesc>
<shortdesc lang="en">base master_score value</shortdesc>
<content type="string" default="0" />
</parameter>

<parameter name="master_score_dev_factor" unique="0" required="0">
<longdesc lang="en">
Working device factor in master_score calculation
each "working" device provides additional value to "master_score", 
so the node that sees more devices will be preferred for the "Master"-role
Setting it to 0 will disable this behavior. 
</longdesc>
<shortdesc lang="en">working device factor in master_score calculation</shortdesc>
<content type="string" default="100" />
</parameter>

<parameter name="master_score_delay" unique="0" required="0">
<longdesc lang="en">
master/slave decreases/increases its master_score after delay of \$master_score_delay seconds
so if some device gets inaccessible, the slave decreases its master_score first and the resource will no be watched
and after this device reappears again the master increases its master_score first
this can work only if the master_score_delay is bigger then monitor interval on both master and slave
Setting it to 0 will disable this behavior.
</longdesc>
<shortdesc lang="en">master_score decrease/increase delay time</shortdesc>
<content type="string" default="30" />
</parameter>
</parameters>

<actions>
<action name="start"   timeout="30" />
<action name="promote"   timeout="30" />
<action name="demote"   timeout="30" />
<action name="notify"   timeout="30" />
<action name="stop"    timeout="30" />
<action name="monitor" depth="0"  timeout="20" interval="29" role="Slave" />
<action name="monitor" depth="0"  timeout="20" interval="60" role="Master" />
<action name="meta-data"  timeout="5" />
<action name="validate-all"  timeout="30" />
</actions>
</resource-agent>
END

    exit $OCF_SUCCESS
}

sg_persist_init() {
    
    if ! ocf_is_root ; then
        ocf_log err "You must be root to perform this operation."
        exit $OCF_ERR_PERM
    fi 

    SG_PERSIST=${OCF_RESKEY_binary:-"$sg_persist_binary"}
    check_binary $SG_PERSIST
    
    ROLE=$OCF_RESKEY_CRM_meta_role
    NOW=$(date +%s)

    RESOURCE="${OCF_RESOURCE_INSTANCE}"
    MASTER_SCORE_VAR_NAME="master-${OCF_RESOURCE_INSTANCE//:/-}"
    PENDING_VAR_NAME="pending-$MASTER_SCORE_VAR_NAME"
    
    #only works with corocync 
    CRM_NODE="${HA_SBIN_DIR}/crm_node"
    NODE_ID_DEC=$($CRM_NODE -i)

    NODE=$($CRM_NODE -l | $GREP -w ^$NODE_ID_DEC)
    NODE=${NODE#$NODE_ID_DEC }
    NODE=${NODE% *}
    
    MASTER_SCORE_ATTRIBUTE="${HA_SBIN_DIR}/crm_attribute --lifetime=reboot --name=$MASTER_SCORE_VAR_NAME --node=$NODE"
    CRM_MASTER="${HA_SBIN_DIR}/crm_master --lifetime=reboot"
    PENDING_ATTRIBUTE="${HA_SBIN_DIR}/crm_attribute --lifetime=reboot --name=$PENDING_VAR_NAME --node=$NODE"

    NODE_ID_HEX=$(printf '0x%x' $NODE_ID_DEC)

    if [ -z "$NODE_ID_HEX" ]; then
        ocf_log err "Couldn't get node id with \"$CRM_NODE\""
        exit $OCF_ERR_INSTALLED
    fi

    ocf_log debug "$RESOURCE: NODE:$NODE, ROLE:$ROLE, NODE_ID DEC:$NODE_ID_DEC HEX:$NODE_ID_HEX"

    DEVS=${OCF_RESKEY_devs:=$devs}
    REQUIRED_DEVS_NOF=${OCF_RESKEY_required_devs_nof:=$required_devs_nof}
    RESERVATION_TYPE=${OCF_RESKEY_reservation_type:=$reservation_type}
    MASTER_SCORE_BASE=${OCF_RESKEY_master_score_base:=$master_score_base}
    MASTER_SCORE_DEV_FACTOR=${OCF_RESKEY_master_score_dev_factor:=$master_score_dev_factor}
    MASTER_SCORE_DELAY=${OCF_RESKEY_master_score_delay:=$master_score_delay}

    ocf_log debug "$RESOURCE: DEVS=$DEVS"
    ocf_log debug "$RESOURCE: REQUIRED_DEVS_NOF=$REQUIRED_DEVS_NOF"
    ocf_log debug "$RESOURCE: RESERVATION_TYPE=$RESERVATION_TYPE"
    ocf_log debug "$RESOURCE: MASTER_SCORE_BASE=$MASTER_SCORE_BASE"
    ocf_log debug "$RESOURCE: MASTER_SCORE_DEV_FACTOR=$MASTER_SCORE_DEV_FACTOR"
    ocf_log debug "$RESOURCE: MASTER_SCORE_DELAY=$MASTER_SCORE_DELAY"

    #expand path wildcards
    DEVS=$(echo $DEVS)

    if [ -z "$DEVS" ]; then
        ocf_log err "\"devs\" not defined"
        exit $OCF_ERR_INSTALLED
    fi
 
    sg_persist_check_devs
    sg_persist_get_status
}

sg_persist_action_usage() {
    cat <<END
    usage: $0 {start|stop|monitor|validate-all|promote|demote|notify|meta-data}

    Expects to have a fully populated OCF RA-compliant environment set.
END
}

sg_persist_get_status() {

    unset WORKING_DEVS[*]
    
    for dev in ${EXISTING_DEVS[*]}
    do
        READ_KEYS=`$SG_PERSIST --in --read-keys $dev 2>&1`
        [ $? -eq 0 ] || continue

        WORKING_DEVS+=($dev)

        echo "$READ_KEYS" | $GREP -qw $NODE_ID_HEX\$
        [ $? -eq 0 ] || continue

        REGISTERED_DEVS+=($dev)

        READ_RESERVATION=`$SG_PERSIST --in --read-reservation $dev 2>&1`
        [ $? -eq 0 ] || continue

        echo "$READ_RESERVATION" | $GREP -qw $NODE_ID_HEX\$
        if [ $? -eq 0 ]; then
            RESERVED_DEVS+=($dev)
        fi

        reservation_key=`echo $READ_RESERVATION | $GREP -o 'Key=0x[0-9a-f]*' | $GREP -o '0x[0-9a-f]*'`
        if [ -n "$reservation_key" ]; then
            DEVS_WITH_RESERVATION+=($dev)
            RESERVATION_KEYS+=($reservation_key)
        fi
    done

    WORKING_DEVS_NOF=${#WORKING_DEVS[*]}

    ocf_log debug "$RESOURCE: working devices: `sg_persist_echo_array ${WORKING_DEVS[*]}`"
    ocf_log debug "$RESOURCE: number of working devices: $WORKING_DEVS_NOF"
    
    ocf_log debug "$RESOURCE: registered devices: `sg_persist_echo_array ${REGISTERED_DEVS[*]}`"
    ocf_log debug "$RESOURCE: reserved devices: `sg_persist_echo_array ${RESERVED_DEVS[*]}`"
    ocf_log debug "$RESOURCE: devices with reservation: `sg_persist_echo_array ${DEVS_WITH_RESERVATION[*]}`"
    ocf_log debug "$RESOURCE: reservation keys: `sg_persist_echo_array ${RESERVATION_KEYS[*]}`"
    
    MASTER_SCORE=$(($MASTER_SCORE_BASE + $MASTER_SCORE_DEV_FACTOR*$WORKING_DEVS_NOF))
    ocf_log debug "$RESOURCE: master_score: $MASTER_SCORE_BASE + $MASTER_SCORE_DEV_FACTOR*$WORKING_DEVS_NOF = $MASTER_SCORE"

}

sg_persist_check_devs() {

    for dev in $DEVS 
    do
        if [ -e "$dev" ]; then
            EXISTING_DEVS+=($dev)
        fi
    done

    EXISTING_DEVS_NOF=${#EXISTING_DEVS[*]}
    if [ $EXISTING_DEVS_NOF -lt $REQUIRED_DEVS_NOF ]; then 
        ocf_log err "Number of existing devices=$EXISTING_DEVS_NOF less then required_devs_nof=$REQUIRED_DEVS_NOF"
        exit $OCF_ERR_INSTALLED
    fi

}

sg_persist_is_registered() {
    for registered_dev in ${REGISTERED_DEVS[*]}
    do
        if [ "$registered_dev" == "$1" ]; then
            return 0
        fi
    done
    return 1
}

sg_persist_get_reservation_key() {
    for array_index in ${!DEVS_WITH_RESERVATION[*]}
    do
        if [ "${DEVS_WITH_RESERVATION[$array_index]}" == "$1" ]; then
            echo ${RESERVATION_KEYS[$array_index]}
            return 0
        fi
    done
    echo ""
}

sg_persist_echo_array() {
    str_count=0
    arr_str=""

    for str in "$@"
    do
        arr_str="$arr_str[$str_count]:$str "    
        str_count=$(($str_count+1))
    done
    echo $arr_str
}

sg_persist_parse_act_pending() {
    
    ACT_PENDING_TS=0
    ACT_PENDING_SCORE=0

    if [ -n "$ACT_PENDING" ]; then
        ACT_PENDING_TS=${ACT_PENDING%%_*}
        ACT_PENDING_SCORE=${ACT_PENDING##*_}
    fi
}

sg_persist_clear_pending() {
    if [ -n "$ACT_PENDING" ]; then 
        DO_PENDING_UPDATE="YES"
        NEW_PENDING=""
    fi
}

sg_persist_new_master_score() {
    DO_MASTER_SCORE_UPDATE="YES"
    NEW_MASTER_SCORE=$1
}

sg_persist_new_pending() {
    DO_PENDING_UPDATE="YES"
    NEW_PENDING=$1
}


# Functions invoked by resource manager actions

sg_persist_action_start() {

    ocf_run $MASTER_SCORE_ATTRIBUTE --update=$MASTER_SCORE
    ocf_run $PENDING_ATTRIBUTE --update=""

    if [ $WORKING_DEVS_NOF -lt $REQUIRED_DEVS_NOF ]; then
        ocf_log err "$RESOURCE: Number of working devices=$WORKING_DEVS_NOF less then required_devs_nof=$REQUIRED_DEVS_NOF"
        exit $OCF_ERR_GENERIC
    fi

    for dev in ${WORKING_DEVS[*]}
    do
        if sg_persist_is_registered $dev ; then
            : OK
        else
            ocf_run $SG_PERSIST --out --no-inquiry --register --param-rk=0 --param-sark=$NODE_ID_HEX $dev
            if [ $? -ne $OCF_SUCCESS ]
            then
                return $OCF_ERR_GENERIC
            fi
        fi
    done

    return $OCF_SUCCESS
}

sg_persist_action_stop() {

    if [ ${#REGISTERED_DEVS[*]} -eq 0 ]; then
        ocf_log debug "$RESOURCE stop: already no registrations"
    else
        # Clear preference for becoming master
        ocf_run $MASTER_SCORE_ATTRIBUTE --delete
        ocf_run $PENDING_ATTRIBUTE --delete

        for dev in ${REGISTERED_DEVS[*]}
        do
            ocf_run $SG_PERSIST --out --no-inquiry --register --param-rk=$NODE_ID_HEX --param-sark=0 $dev
        done
    fi

    return $OCF_SUCCESS
}

sg_persist_action_monitor() {

    ACT_MASTER_SCORE=`$MASTER_SCORE_ATTRIBUTE --query --quiet 2>&1`
    ocf_log debug "$RESOURCE monitor: ACT_MASTER_SCORE=$ACT_MASTER_SCORE"
    
    ACT_PENDING=`$PENDING_ATTRIBUTE --query --quiet 2>&1`
    ocf_log debug "$RESOURCE monitor: ACT_PENDING=$ACT_PENDING"

    sg_persist_parse_act_pending
    ocf_log debug "$RESOURCE monitor: ACT_PENDING_TS=$ACT_PENDING_TS"
    ocf_log debug "$RESOURCE monitor: ACT_PENDING_VAL=$ACT_PENDING_SCORE"
   
    ocf_log debug "$MASTER_SCORE, $ACT_MASTER_SCORE, $ROLE"
    
    DO_MASTER_SCORE_UPDATE="NO"
    DO_PENDING_UPDATE="NO"
    if [ -n "$ACT_MASTER_SCORE" ] 
    then
        if [ $ACT_MASTER_SCORE -eq $MASTER_SCORE ]; then
            sg_persist_clear_pending
        else
            case $ROLE in
            Master)  
                if [ $MASTER_SCORE -lt $ACT_MASTER_SCORE ]; then
                    if [ -n "$ACT_PENDING" ] 
                    then
                        if [ $(($NOW-$ACT_PENDING_TS-$MASTER_SCORE_DELAY)) -ge 0 ]; then
                            sg_persist_new_master_score $MASTER_SCORE
                            sg_persist_clear_pending
                        fi
                    else
                        if [ $MASTER_SCORE_DELAY -eq 0 ]; then
                            sg_persist_new_master_score $MASTER_SCORE
                            sg_persist_clear_pending
                        else
                            sg_persist_new_pending "${NOW}_${MASTER_SCORE}"
                        fi
                    fi
                else
                    sg_persist_new_master_score $MASTER_SCORE
                    sg_persist_clear_pending
                fi
                ;;

            Slave)
                if [ $MASTER_SCORE -gt $ACT_MASTER_SCORE ]; then
                    if [ -n "$ACT_PENDING" ]; then 
                        if [ $(($NOW-$ACT_PENDING_TS-$MASTER_SCORE_DELAY)) -ge 0 ]; then
                            sg_persist_new_master_score $MASTER_SCORE
                            sg_persist_clear_pending
                        fi
                    else
                        if [ $MASTER_SCORE_DELAY -eq 0 ]; then
                            sg_persist_new_master_score $MASTER_SCORE
                            sg_persist_clear_pending
                        else
                            sg_persist_new_pending "${NOW}_${MASTER_SCORE}"
                        fi
                    fi
                else
                    sg_persist_new_master_score $MASTER_SCORE
                    sg_persist_clear_pending
                fi
                ;;

            *)
                ;;

            esac
        fi
    fi

    if [ $DO_MASTER_SCORE_UPDATE == "YES" ]; then
        ocf_run $MASTER_SCORE_ATTRIBUTE --update=$NEW_MASTER_SCORE
    fi

    if [ $DO_PENDING_UPDATE == "YES" ]; then
        ocf_run $PENDING_ATTRIBUTE --update=$NEW_PENDING
    fi

    if [ ${#REGISTERED_DEVS[*]} -eq 0 ]; then
        ocf_log debug "$RESOURCE monitor: no registrations"
        return $OCF_NOT_RUNNING
    fi

    if [ ${#RESERVED_DEVS[*]} -eq ${#WORKING_DEVS[*]} ]; then 
        return $OCF_RUNNING_MASTER
    fi

    if [ ${#REGISTERED_DEVS[*]} -eq ${#WORKING_DEVS[*]} ]; then 
        if [ $RESERVATION_TYPE -eq 7 ] || [ $RESERVATION_TYPE -eq 8 ]; then
            if [ ${#DEVS_WITH_RESERVATION[*]} -gt 0 ]; then
                return $OCF_RUNNING_MASTER
             else
                return $OCF_SUCCESS
            fi
        else
            return $OCF_SUCCESS
        fi
    fi

    ocf_log err "$RESOURCE monitor: unexpected state"
    
    return $OCF_ERR_GENERIC
}

sg_persist_action_promote() {

    if [ ${#RESERVED_DEVS[*]} -gt 0 ]; then 
        ocf_log info "$RESOURCE promote: already master"
        return $OCF_SUCCESS
    fi

    for dev in ${WORKING_DEVS[*]}
    do
        reservation_key=`sg_persist_get_reservation_key $dev`
        case $RESERVATION_TYPE in
        1|3|5|6)        
            if [ -z "$reservation_key" ]; then
                ocf_run $SG_PERSIST --out --no-inquiry --reserve --param-rk=$NODE_ID_HEX --prout-type=$RESERVATION_TYPE $dev
                if [ $? -ne $OCF_SUCCESS ]; then
                    return $OCF_ERR_GENERIC
                fi
            else
                ocf_run $SG_PERSIST --out --no-inquiry --preempt --param-sark=$reservation_key --param-rk=$NODE_ID_HEX --prout-type=$RESERVATION_TYPE $dev
                if [ $? -ne $OCF_SUCCESS ]; then
                    return $OCF_ERR_GENERIC
                fi
            fi
            ;;

        7|8) 
            if [ -z "$reservation_key" ]; then
                ocf_run $SG_PERSIST --out --no-inquiry --reserve --param-rk=$NODE_ID_HEX --prout-type=$RESERVATION_TYPE $dev
                if [ $? -ne $OCF_SUCCESS ]
                then
                    return $OCF_ERR_GENERIC
                fi
            else 
                ocf_log info "$RESOURCE promote: there already exist an reservation holder, all registrants become reservation holders"
                return $OCF_SUCCESS
            fi
            ;;
  
        *)
            return $OCF_ERR_ARGS
            ;;

        esac
    done

    return $OCF_SUCCESS
}

sg_persist_action_demote() {
    case $RESERVATION_TYPE in
    1|3|5|6)
        if [ ${#RESERVED_DEVS[*]} -eq 0 ]; then 
            ocf_log info "$RESOURCE demote: already slave"
            return $OCF_SUCCESS
        fi

        for dev in ${RESERVED_DEVS[*]}
        do
            ocf_run $SG_PERSIST --out --no-inquiry --release --param-rk=$NODE_ID_HEX --prout-type=$RESERVATION_TYPE $dev
            if [ $? -ne  $OCF_SUCCESS ]; then
               return $OCF_ERR_GENERIC
            fi
        done
        ;;

    7|8)  #in case of 7/8, --release won't release the reservation unless unregister the key.    
        if [ ${#REGISTERED_DEVS[*]} -eq 0 ]; then 
            ocf_log info "$RESOURCE demote: already slave"
            return $OCF_SUCCESS
        fi

        for dev in ${REGISTERED_DEVS[*]}
        do
            ocf_run $SG_PERSIST --out --no-inquiry --register --param-rk=$NODE_ID_HEX --param-sark=0 $dev
            if [ $? -ne $OCF_SUCCESS ]; then
               return $OCF_ERR_GENERIC
            fi
        done
        ;;
   
    *)
        return $OCF_ERR_ARGS
        ;;
    esac

    return $OCF_SUCCESS
}

sg_persist_action_notify() {
    local n_type="$OCF_RESKEY_CRM_meta_notify_type"
    local n_op="$OCF_RESKEY_CRM_meta_notify_operation"
    set -- $OCF_RESKEY_CRM_meta_notify_active_resource
    local n_active="$#"
    set -- $OCF_RESKEY_CRM_meta_notify_stop_resource
    local n_stop="$#"
    set -- $OCF_RESKEY_CRM_meta_notify_start_resource
    local n_start="$#"

    ocf_log debug "$RESOURCE notify: $n_type for $n_op - counts: active $n_active - starting $n_start - stopping $n_stop"
    
    return $OCF_SUCCESS
}

sg_persist_action_validate_all () {

    if [ "$OCF_RESKEY_CRM_meta_master_max" != "1" ] && [ "$RESERVATION_TYPE"  != "7" ] && [ "$RESERVATION_TYPE" != "8" ]; then
        ocf_log err "Master options misconfigured."
        exit $OCF_ERR_CONFIGURED
    fi

    return $OCF_SUCCESS
}

if [ $# -ne 1 ]; then
    echo "Incorrect parameter count."
    sg_persist_action_usage
    exit $OCF_ERR_ARGS
fi

ACTION=$1
case $ACTION in
    meta-data)    
        meta_data
        ;;
        
    validate-all)    
        sg_persist_init
        sg_persist_action_validate_all
        ;;

    start|promote|monitor|stop|demote)
        ocf_log debug "$RESOURCE: starting action \"$ACTION\""
        sg_persist_init
        sg_persist_action_$ACTION
        exit $?
        ;;
        
    notify)    
        sg_persist_action_notify
        exit $?
        ;;

    usage|help)    
        sg_persist_action_usage
        exit $OCF_SUCCESS
        ;;

    *)  
        sg_persist_action_usage
        exit $OCF_ERR_ARGS
        ;;

    esac