noflushd.templ

linux 系统控制硬盘旋转和停止的程序（spin down/up）

#!/bin/bash
#
# Start the noflush daemon to spin down idle disks.
#
# Written by Daniel Kobras <[e-mail]>
# $Id: noflushd.templ,v 1.6 2004/07/19 10:00:32 nold Exp $
#
# The next lines define runlevels and priorities to start this
# skript. Syntax is <runlevels_to_start> <start_priority> <stop_priotity>.
#
# chkconfig: 2345 80 10
# description: 	Start and stop the noflush daemon to handle spindown \
#		of idle disks.
#
### BEGIN INIT INFO
# Provides: noflushd
# Required-Start: $remote_fs
# Required-Stop:
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
### END INIT INFO

# Note: Edit TIMEOUT below to change the default timeout. If present, 
# variable NOFLUSHD_TIMEOUT in /etc/rc.config will override this value.
# However, highest priority is given to an environment variable TIMEOUT.
# Example (assuming bash, skript in /etc/init.d/): 
#
# # TIMEOUT=60 /etc/init.d/noflushd restart
#
# to restart the daemon with 1 hour of idle timeout, overriding defaults.

# XXX: In earlier versions, the timeout values were given in seconds.
#      Now we use minutes instead. Don't get confused!

# One IDE hard disk present:
DISKS="/dev/hda"

DEFAULT_TIMEOUT=60	# default timeout in minutes (EDIT THIS!)

if [ -f /etc/rc.config ]; then
	. /etc/rc.config
	if [ "$START_NOFLUSHD" ]; then
		[ "$START_NOFLUSHD" = "yes" ] || exit 0
	fi	
	if [ ! "$TIMEOUT" ]; then
		[ "$NOFLUSHD_TIMEOUT" ] && TIMEOUT="$NOFLUSHD_TIMEOUT"
	fi
	[ "$NOFLUSHD_DISKS" ] && DISKS="$NOFLUSHD_DISKS"
elif [ -f /etc/sysconfig/noflushd ]; then
	# No namespace problems here. TIMEOUT and DISKS can be set
	# verbatim.
	. /etc/sysconfig/noflushd
fi

[ ! "$TIMEOUT" ] && TIMEOUT=$DEFAULT_TIMEOUT
DAEMON=+sbindir+/noflushd	# +sbindir+ gets rewritten at make time.
PIDFILE=/var/run/noflushd.pid
OPTIONS="-v -n $TIMEOUT $DISKS"

check_pidfile() {

	test -r "$PIDFILE" || return 0
	return $(cat $PIDFILE)
}

find_pid_by_name() {

	NAME="$1"
	for i in /proc/[1-9]*; do
		# Use cat instead of shell redir because /proc/<pid> might
		# have vanished before we had a chance to open an fd on
		# status. The cat variant fails gracefully in this case.
		cat "$i/status" 2> /dev/null | while read TAG VALUE; do
                	test "$TAG" = "Name:" || continue
                     	test "$VALUE" != "$NAME" || return "$(basename $i)"
			break
		done || return $?
	done
	return 0
}

start_debian() {

	/sbin/start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON -- $OPTIONS
}

stop_debian() {

	/sbin/start-stop-daemon --stop --quiet --pidfile $PIDFILE --exec $DAEMON
}

start_lsb() {

	startproc $DAEMON $OPTIONS
}

stop_lsb() {

	killproc -TERM $DAEMON
	rm -f $PIDFILE
}

start_redhat() {

	daemon $DAEMON $OPTIONS
}

stop_redhat() {

	killproc $DAEMON
}

start_generic() {
	if ! check_pidfile || ! find_pid_by_name $(basename $DAEMON); then
		echo "Warning! Another noflushd appears to be already running. Starting anyway."
	fi
	$DAEMON $OPTIONS 2>&1 >/dev/null
}

stop_generic() {

	check_pidfile || { kill $?; return; }
	find_pid_by_name $(basename $DAEMON) || kill $?
}

activate_kupdate() {

	find_pid_by_name kupdate || kill -CONT $?
	find_pid_by_name kupdated || kill -CONT $?
}

test -x $DAEMON || exit 0

found=0
for name in pdflush kupdate kupdated; do
	find_pid_by_name "$name" || { found=1; break; }
done

if [ "$found" -eq 0 ]; then
		echo "No kupdate[d]/pdflush found. Run bdflush-1.6 for sleep support."
		exit 0
fi

set -e 

METHOD=generic
[ -x /sbin/start-stop-daemon ] && METHOD=debian
[ -x /sbin/startproc ] && METHOD=lsb
if [ -f /etc/rc.d/init.d/functions ]; then
	. /etc/rc.d/init.d/functions && METHOD=redhat
fi

case "$1" in

	start)
		echo "Starting idle disk daemon with default timeout $TIMEOUT..."
		start_$METHOD && echo "Done."
		;;
	stop)
		echo -n "Stopping idle disk daemon"
		stop_$METHOD && echo "."
		activate_kupdate	# Paranoia.
		;;
	restart)
		echo -n "Stopping idle disk daemon"
		stop_$METHOD && echo "."
		activate_kupdate	# Paranoia.
		sleep 1
		echo "Starting idle disk daemon with default timeout $TIMEOUT..."
		start_$METHOD && echo "Done."
		;;	
	*)
		echo "Usage: $(basename $0) {start|stop|restart}"
		exit 1
esac

exit 0