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#
# Start/Stop the workload manager
#
# Copyright IBM Corporation. 2008
#
# Authors: Balbir Singh <balbir@linux.vnet.ibm.com>
# This program is free software; you can redistribute it and/or modify it
# under the terms of version 2.1 of the GNU Lesser 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.
#
#
# TODO: Make this code more robust, add error checking and recovery
# for invalid configuration or interrupted execution
#
# Make the script LSB compliant
#
CONF_FILE=/etc/wlm.conf
PROC_CGROUPS_FILE=/proc/cgroups
CGROUP_FS=cgroup
MOUNT_POINT=/dev/container
#MOUNT_OPTS=cpu
IGNORE_OPTS="ns cpuset"
parse_controller_file() {
ctlr=$1
file=$2
tuid="root"
tgid="root"
cuid="root"
cgid="root"
pushd $PWD 2>&1 > /dev/null
while read name opts
do
case $name in
'mount')
;;
*)
if ! echo $name | grep -q ^#
then
echo "Creating class $name"
class=$name
mkdir -p $MOUNTPOINT/$class
cd $MOUNTPOINT/$class
if echo $opts | grep -q "="
then
for single_opt in $opts
do
cf=`echo $single_opt | cut -d '=' -f1`
co=`echo $single_opt | cut -d '=' -f2`
case $cf in
"tuid")
tuid=$co
;;
"cuid")
cuid=$co
;;
"tgid")
tgid=$co
;;
"cgid")
cgid=$co
;;
*)
echo -n $co > $cf
;;
esac
done
chown -R $cuid:$cgid $MOUNTPOINT/$class
chown -R $tuid:$tgid $MOUNTPOINT/$class/tasks
fi
fi
esac
done < $file
popd 2>&1 > /dev/null
}
parse_controller_opts() {
name=$1;
file=$2;
if [ ! -r $PROC_CGROUPS_FILE ]
then
echo "$PROC_CGROUPS_FILE does not exist, please compile"
echo "cgroups into the kernel"
exit 1
else
line=`grep -w $name $PROC_CGROUPS_FILE`
if [ $? -ne 0 ]
then
echo "$name controller not enabled"
exit 1
fi
active=`echo $line | awk '{print $2}'`
if [[ $active -eq 0 ]]
then
echo "$name controller not mounted"
else
parse_controller_file $name $file
fi
fi
}
parse_conf_file() {
while read name conf
do
# skip all comments
if ! echo $name | grep -q ^#
then
case $name in
'mount')
MOUNTPOINT=`echo $conf | cut -d ' ' -f1`;
MOUNTOPTS=`echo $conf | cut -d ' ' -f2`;
;;
esac
fi
done < $CONF_FILE
return 0;
}
mount_fs() {
if [ ! -r $PROC_CGROUPS_FILE ]
then
echo "$PROC_CGROUPS_FILE does not exist, please compile"
echo "cgroups into the kernel"
exit 1
else
while read name hierarchy num_cgroups
do
if ! echo $name | grep -q ^#
then
echo $IGNORE_OPTS | grep -wq $name
if [[ $? -ne 0 ]]
then
MOUNT_OPTS=$name","$MOUNT_OPTS
fi
fi
done < $PROC_CGROUPS_FILE
MOUNT_OPTS=${MOUNT_OPTS%%","}
#line=`grep -w $MOUNT_OPTS $PROC_CGROUPS_FILE`
#if [ $? -ne 0 ]
#then
# echo "$name controller not enabled"
# exit 1
#fi
fi
mkdir -p $MOUNTPOINT
mount -t $CGROUP_FS $CGROUP_FS -o $MOUNT_OPTS $MOUNTPOINT
#
# Give root tasks read/write permission to all, since tasks
# tasks will be moved to root frequently
#
chmod ago+rwx $MOUNTPOINT/tasks
chmod ago+rwx $MOUNTPOINT
chmod +t $MOUNTPOINT
return $?
}
umount_fs() {
umount $MOUNTPOINT
rmdir $MOUNTPOINT
}
create_classes() {
while read name conf
do
# skip all comments
if ! echo $name | grep -q ^#
then
case $name in
'mount')
;;
*)
parse_controller_opts $name $conf
esac
fi
done < $CONF_FILE
}
start() {
echo "Starting wlm service: "
mount_fs
if [ $? -eq 0 ]
then
create_classes
fi
[ $? == 0 ] && touch /var/lock/subsys/wlm
return $?
}
move_all_to_init_class() {
cd $MOUNTPOINT
cat /proc/mounts | grep -wq $MOUNTPOINT
if [ $? -ne 0 ]
then
echo "resource control filesystem not mounted"
exit 1
fi
for i in `find . -type d`
do
case $i in
'.')
;;
*)
class=${i#./*}
echo "Removing class $class"
sed -nu p < ./$i/tasks > tasks
rmdir $i
;;
esac
done
cd - > /dev/null
}
stop() {
move_all_to_init_class
umount_fs
}
trapped() {
#
# Do nothing
#
true
}
#
# main script work done here
#
trap "trapped ABRT" ABRT
trap "trapped QUIT" QUIT
trap "trapped TERM" TERM
trap "trapped INT" INT
parse_conf_file
case $1 in
'start')
start;
;;
'stop')
stop;
;;
esac
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