OpenVZ container mount script with space quoting

VEID.mount

#!/bin/bash
###
# More advanced on-mount script for OpenVZ container
# Based on https://openvz.org/Bind_mounts
#
# 1. Mount some directory inside container
# 2. Set quotas on that directory inside container
#

[ -f /etc/vz/vz.conf ] || exit 1
[ -f $VE_CONFFILE ] || exit 1

. /etc/vz/vz.conf
. ${VE_CONFFILE}

# Mount point in host hypervisor machine
SRC=/mnt/external-host-mp
# Mount point inside container
DST=/mnt/internal-vm-mp

if [ ! -e ${VE_ROOT}${DST} ]; then mkdir -p ${VE_ROOT}${DST}; fi
# Mount options are from 'man mount': noatime, relatime, ro, nosuid, noexec, etc.
mount -n -t simfs ${SRC} ${VE_ROOT}${DST} -o ${SRC},noatime,ro

# Do not need quotas? Then uncomment:
#exit 0

# Quota ID, make it real BIG number, to avoid crossing with container root VEID
QID=$((VEID+1000000))

# Check for existing
vzquota show $QID >/dev/null 2>/dev/null
if [ $? -ne 0 ]; then
    # If not exists - create
    # Double check for needed size - it must be in 1kb BLOCKS
    BS=1024
    # Size in GB
    # Blocks soft limit
    BSL=$((10*1024*1024*1024))
    # Blocks hard limit - BSL + 10%
    BHL=$((BSL/10*11))
    # Inodes soft limit - 1/10 BSL
    ISL=$((BSL/10))
    # Inodes hard limit - 1/10 BHL
    IHL=$((BHL/10))
    # Size in blocks
    BSL=$((BSL/BS))
    BHL=$((BHL/BS))
    # Quotas w/o exipation
    vzquota init $QID -p ${VE_ROOT}${DST} -b $BSL -B $BHL -i $ISL -I $IHL -e 0 -n 0
fi

# Quotas ON after mount destination directory
vzquota on $QID