#!/bin/sh
#
# nfs           This shell script takes care of starting and stopping
#               the NFS services.
#
# description: NFS is a popular protocol for file sharing across TCP/IP \
#              networks. This service provides NFS server functionality, \
#              which is configured via the /etc/exports file.

# Source functions library
source /etc/rc.d/init.d/functions

log_script_name "$0 $*"

# Load global network parameters
source /etc/sysconfig/network/network-parameters

# Check that networking is up.
#[ ${NETWORKING} = "no" ] && exit ${EXIT_CODE_WARNING}

# Check if NFS server functionality is desired
if [ "x${NFS_SERVER_ENA}" != "xyes" -a "x${NFS_SERVER_ENA}" != "xYes" -a "x${NFS_SERVER_ENA}" != "xYES" ]; then
    exit ${EXIT_CODE_SUCCESS}
fi

# Check for presence of executables
if [ ! -x /sbin/rpc.nfsd ]; then
    echo "Missing rpc.nfsd executable"
    exit ${EXIT_CODE_WARNING}
fi
if [ ! -x /sbin/rpc.mountd ]; then
    echo "Missing rpc.mountd executable"
    exit ${EXIT_CODE_WARNING}
fi
if [ ! -x /sbin/exportfs ]; then
    echo "Missing exportfs executable"
    exit ${EXIT_CODE_WARNING}
fi
if [ ! -s /etc/exports ]; then
    echo "Missing /etc/exports configuration file"
    exit ${EXIT_CODE_WARNING}
fi

# Check for and source configuration file otherwise set defaults
# TUNE_QUEUE: controls whether to up the size of input queues
[ -f /etc/sysconfig/network/nfs ] && . /etc/sysconfig/network/nfs

[ -z "$MOUNTD_NFS_V2" ] && MOUNTD_NFS_V2=auto
[ -z "$MOUNTD_NFS_V3" ] && MOUNTD_NFS_V3=auto

# Number of servers to be started by default
[ -z "$NFSDCOUNT" ] && NFSDCOUNT=8

# Remote quota server
[ -z "$RQUOTAD" ] && RQUOTAD=`type -path rpc.rquotad`

# Get the initial values for the input sock queues
# at the time of running the script.
if [ "$TUNE_QUEUE" = "yes" ]; then
    RMEM_DEFAULT=`/sbin/sysctl -n net.core.rmem_default`
    RMEM_MAX=`/sbin/sysctl -n net.core.rmem_max`
    # 256kb recommended minimum size based on SPECsfs NFS benchmarks
    [ -z "$NFS_QS" ] && NFS_QS=262144
fi

MOUNTD_OPTIONS="$MOUNTD_OPTIONS --no-nfs-version 2"
MOUNTD_OPTIONS="$MOUNTD_OPTIONS --nfs-version 3"

nfsd_start() {
    # Apply input queue increase for nfs server
    if [ "$TUNE_QUEUE" = "yes" ]; then
	/sbin/sysctl -w net.core.rmem_default=$NFSD_QS >/dev/null 2>&1
	/sbin/sysctl -w net.core.rmem_max=$NFSD_QS >/dev/null 2>&1
    fi
    cmd_run_log_box "Starting NFS services" loadproc /sbin/exportfs -ra
    if [ -n "$RQUOTAD" -a "$RQUOTAD" != "no" ]; then
	cmd_run_log_box "Starting NFS quotas" loadproc rpc.rquotad
    fi
    cmd_run_log_box "Starting NFS daemon" loadproc rpc.nfsd $NFSDCOUNT

    [ -n "$MOUNTD_PORT" ] \
	&& MOUNTD_OPTIONS="$MOUNTD_OPTIONS -p $MOUNTD_PORT"
    [ "$MOUNTD_TCP" = "no" -o "$MOUNTD_TCP" = "NO" ] \
	&& MOUNTD_OPTIONS="$MOUNTD_OPTIONS --no-tcp"

    cmd_run_log_box "Starting NFS mountd" loadproc rpc.mountd $MOUNTD_OPTIONS

    touch /var/lock/subsys/nfs
    # reset input queue for rest of network services
    if [ "$TUNE_QUEUE" = "yes" ]; then
	/sbin/sysctl -w net.core.rmem_default=$RMEM_DEFAULT >/dev/null 2>&1
	/sbin/sysctl -w net.core.rmem_max=$RMEM_MAX >/dev/null 2>&1
    fi
}

nfsd_stop() {
    cmd_run_log_box "Stopping NFS mountd" killproc rpc.mountd
    cmd_run_log_box "Stopping NFS daemon" killproc nfsd
    if [ -n "$RQUOTAD" ]; then
	cmd_run_log_box "Stopping NFS quotas" killproc rpc.rquotad
    fi

    # Do it the last so that clients can still access the server
    # when the server is running.
    echo "Refreshing NFS Exported Filesystems..."
    /sbin/exportfs -au

    rm -f /var/lock/subsys/nfs
}


# See how we were called
case "$1" in
    start)
	cmd_run_log_box_warn "NFS server start" nfsd_start
	;;

    stop)
	cmd_run_log_box_warn "NFS server stop" nfsd_stop
	;;

    reload)
	/sbin/exportfs -ra
	touch /var/lock/subsys/nfs
	;;

    restart)
	$0 stop
	sleep 1
	$0 start
	;;

    status)
	statusproc rpc.mountd
	statusproc nfsd
	if [ -n "$RQUOTAD" ]; then
	    statusproc rpc.rquotad
	fi
	;;

    *)
	echo "Usage: $0 {reload|restart|start|status|stop}"
        exit ${EXIT_CODE_FAILURE}
	;;
esac

exit $?