#!/bin/sh
# script to manage nfs in a clustered environment

[ -n "$CTDB_BASE" ] || \
    export CTDB_BASE=$(cd -P $(dirname "$0") ; dirname "$PWD")

. $CTDB_BASE/functions

service_name="nfs"
service_start ()
{
    startstop_nfs stop
    startstop_nfs start
    set_proc "sys/net/ipv4/tcp_tw_recycle" 1
}
service_stop ()
{
    startstop_nfs stop
}
service_reconfigure ()
{
    # if the ips have been reallocated, we must restart the lockmanager
    # across all nodes and ping all statd listeners
    [ -x $CTDB_BASE/statd-callout ] && {
	$CTDB_BASE/statd-callout notify &
    } >/dev/null 2>&1
}

nfs_check_thread_count ()
{
    [ "$CTDB_MONITOR_NFS_THREAD_COUNT" = "yes" ] || return 0

    # If $RPCNFSDCOUNT/$USE_KERNEL_NFSD_NUMBER isn't set then we could
    # guess the default from the initscript.  However, let's just
    # assume that those using the default don't care about the number
    # of threads and that they have switched on this feature in error.
    _configured_threads="${RPCNFSDCOUNT:-${USE_KERNEL_NFSD_NUMBER}}"
    [ -n "$_configured_threads" ] || return 0

    # nfsd should be running the configured number of threads.  If
    # there are a different number of threads then tell nfsd the
    # correct number.  
    _running_threads=$(get_proc "fs/nfsd/threads")
    # Intentionally not arithmetic comparison - avoids extra errors
    # when get_proc() fails...
    if [ "$_running_threads" != "$_configured_threads" ] ; then
	echo "Attempting to correct number of nfsd threads from ${_running_threads} to ${_configured_threads}"
	set_proc "fs/nfsd/threads" "$_configured_threads"
    fi
}

loadconfig

[ "${CTDB_NFS_SERVER_MODE:-${NFS_SERVER_MODE}}" != "ganesha" ] || exit 0

ctdb_setup_service_state_dir

ctdb_start_stop_service

is_ctdb_managed_service || exit 0

ctdb_service_check_reconfigure

case "$1" in 
     init)
	# read statd from persistent database
	;;
     startup)
	ctdb_service_start
	;;

     shutdown)
	ctdb_service_stop
	;;

     takeip)
	ctdb_service_set_reconfigure
	;;

     releaseip)
	ctdb_service_set_reconfigure
	;;

      monitor)
	# Check that directories for shares actually exist.
	[ "$CTDB_NFS_SKIP_SHARE_CHECK" = "yes" ] || {
	    exportfs -v | grep '^/' | 
	    sed -r -e 's@[[:space:]]+[^[:space:]()]+\([^[:space:]()]+\)$@@' | 
	    sort -u | 
	    ctdb_check_directories 
	} || exit $?

	update_tickles 2049

	nfs_check_rpc_services

	nfs_check_thread_count

	# Every 10 minutes, update the statd state database for which
	# clients need notifications
	nfs_statd_update 600
       	;;

    *)
	ctdb_standard_event_handler "$@"
	;;
esac

exit 0