#!/bin/sh
#
# Support:      linux-ha@lists.linux-ha.org
# License:      GNU General Public License (GPL)
# 
# Filesystem
#      Description: Manages a Filesystem on a shared storage medium.
#  Original Author: Eric Z. Ayers (eric.ayers@compgen.com)
# Original Release: 25 Oct 2000
#
# usage: ./Filesystem {start|stop|status|monitor|validate-all|meta-data}
#
#	  OCF parameters are as below:
#		OCF_RESKEY_device
#		OCF_RESKEY_directory
#		OCF_RESKEY_fstype
#		OCF_RESKEY_options
#
#OCF_RESKEY_device    : name of block device for the filesystem. e.g. /dev/sda1, /dev/md0
#			Or a -U or -L option for mount, or an NFS mount specification
#OCF_RESKEY_directory : the mount point for the filesystem
#OCF_RESKEY_fstype    : optional name of the filesystem type. e.g. ext2
#OCF_RESKEY_options   : options to be given to the mount command via -o
#
#
# An example usage in /etc/ha.d/haresources: 
#       node1  10.0.0.170 Filesystem::/dev/sda1::/data1::ext2
#  or
#       node1  10.0.0.170 Filesystem::-Ldata1::/data1::ext2
#  or
#       node1  10.0.0.170 Filesystem::server:/data1::/data1::nfs::ro
#
# This assumes you want to manage a filesystem on a shared (scsi) bus.
# Do not put this filesystem in /etc/fstab.  This script manages all of
# that for you.
#
# If you are interested in High Availability, you will probably also want
# some sort of external hardware RAID controller in front of the actual 
# disks.  I don't mean a RAID controller embedded in the host controller -
# it has to be an external controller.
#
# It can also be an internal RAID controller if the controller supports
# failover.  IBM's ServeRAID controller does this, and it automatically
# prohibits concurrent access too, so it's pretty cool in this application.
#
# There is a script for software RAID-1 included in this directory.  Right 
# now, I wouldn't recommend using software RAID (see notes in the Raid1 script)
#
# NOTE: There is no locking (such as a SCSI reservation) being done here.
#       I would if the SCSI driver could properly maintain the reservation,
#       which it cannot, even with the 'scsi reservation' patch submitted
#       earlier this year by James Bottomley.  The patch minimizes the
#       bus resets caused by a RESERVATION_CONFLICT return, and helps the 
#       reservation stay when 2 nodes contend for a reservation, 
#       but it does not attempt to recover the reservation in the 
#       case of a bus reset.  
#
#       What all this means is that if 2 nodes mount the same file system
#       read-write, the filesystem is going to become corrupted.
#
#	As a result, you should use this together with the stonith option
#	and redundant, independent communications paths.
#
#	If you don't do this, don't blame us when you scramble your disk.
# 
#	Note:  the ServeRAID controller does prohibit concurrent acess
#	In this case, you don't actually need STONITH, but redundant comm is
#	still an excellent idea.
#

#######################################################################
# Initialization:

. ${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs

#######################################################################
HOSTOS=`uname`

usage() {
	cat <<-EOT
	usage: $0 {start|stop|status|monitor|validate-all|meta-data}
	EOT
}

meta_data() {
	cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="Filesystem">
<version>1.0</version>

<longdesc lang="en">
Resource script for Filesystem. It manages a Filesystem on a shared storage medium. 
</longdesc>
<shortdesc lang="en">Filesystem resource agent</shortdesc>

<parameters>
<parameter name="device" required="1">
<longdesc lang="en">
The name of block device for the filesystem, or -U, -L options for mount, or NFS mount specification.
</longdesc>
<shortdesc lang="en">block device</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="directory" required="1">
<longdesc lang="en">
The mount point for the filesystem.
</longdesc>
<shortdesc lang="en">mount point</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="fstype" required="1">
<longdesc lang="en">
The optional type of filesystem to be mounted.
</longdesc>
<shortdesc lang="en">filesystem type</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="options">
<longdesc lang="en">
Any extra options to be given as -o options to mount.
</longdesc>
<shortdesc lang="en">options</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="ocfs2_cluster">
<longdesc lang="en">
The name (UUID) of the OCFS2 cluster this filesystem is part of,
iff this is an OCFS2 resource and there's more than one cluster. You
should not need to specify this.
</longdesc>
<shortdesc lang="en">OCFS2 cluster name/UUID</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="ocfs2_configfs">
<longdesc lang="en">
Mountpoint of the cluster hierarchy below configfs. You should not
need to specify this.
</longdesc>
<shortdesc lang="en">OCFS2 configfs root</shortdesc>
<content type="string" default="" />
</parameter>
</parameters>

<actions>
<action name="start" timeout="60" />
<action name="stop" timeout="60" />
<action name="notify" timeout="60" />
<action name="monitor" depth="0" timeout="40" interval="20" start-delay="10" />
<action name="validate-all" timeout="5" />
<action name="meta-data" timeout="5" />
</actions>
</resource-agent>
END
}

#
#	Make sure the kernel does the right thing with the FS buffers
#	This function should be called after unmounting and before mounting
#	It may not be necessary in 2.4 and later kernels, but it shouldn't hurt
#	anything either...
#
#	It's really a bug that you have to do this at all...
#
flushbufs() {
    if have_binary $BLOCKDEV ; then
      if [ "$blockdevice" = "yes" ] ; then
        $BLOCKDEV --flushbufs $1
        return $?
      fi
    fi
    return 0
}

# Take advantage of /etc/mtab if present, use portable mount command
# otherwise. Normalize format to "dev mountpoint fstype".
list_mounts() {
	if [ -f "/etc/mtab" -a -r "/etc/mtab" ]; then
		cut -d' ' -f1,2,3 </etc/mtab
	else
		$MOUNT | cut -d' ' -f1,3,5
	fi
}

determine_blockdevice() {
	if [ $blockdevice == "yes" ]; then
		return
	fi

	# Get the current real device name, if possible.
	# (specified devname could be -L or -U...)
	case "$FSTYPE" in
	nfs|smbfs|cifs) ;;
	*)	DEVICE=`list_mounts | grep " $MOUNTPOINT " | cut -d' ' -f1`
		if [ -b "$DEVICE" ]; then
		  blockdevice=yes
		fi
		;;
	esac
}

# Lists all filesystems potentially mounted under a given path,
# excluding the path itself.
list_submounts() {
	list_mounts | grep " $1/" | cut -d' ' -f2 | sort -r
}

ocfs2_del_cache() {
	if [ -e "$_OCFS2_uuid_cache" ]; then
		rm -f $_OCFS2_uuid_cache 2>/dev/null
	fi
}

ocfs2_cleanup() {
	# We'll never see the post-stop notification. We're gone now,
	# have unmounted, and thus should remove the membership.
	#
	# (Do so regardless of whether we were unmounted already,
	# because the admin might have manually unmounted but not
	# cleared up the membership directory. Bad admin, no cookie.)
	#
	if [ ! -d "$OCFS2_FS_ROOT" ]; then
		ocf_log info "$OCFS2_FS_ROOT: Filesystem membership already gone."
	else
		ocf_log info "$OCFS2_FS_ROOT: Removing membership directory."
		rm -rf $OCFS2_FS_ROOT/
	fi

	ocfs2_del_cache
}

ocfs2_fetch_uuid() {
	mounted.ocfs2 -d $DEVICE|tail -1|awk '{print $3}'|tr -d -- -|tr '[a-z]' '[A-Z]'
}

ocfs2_set_uuid() {
	_OCFS2_uuid_cache="$HA_RSCTMP/Filesystem.ocfs2_uuid.$(echo $DEVICE|tr / .)"
	
	if [ "$OP" != "start" -a -e "$_OCFS2_uuid_cache" ]; then
		# Trust the cache.
		OCFS2_UUID=$(cat $_OCFS2_uuid_cache 2>/dev/null)
		return 0
	fi

	OCFS2_UUID=$(ocfs2_fetch_uuid)
	if [ -n "$OCFS2_UUID" -a "$OCFS2_UUID" != "UUID" ]; then
		# UUID valid:
		echo $OCFS2_UUID > $_OCFS2_uuid_cache 
		return 0
	fi

	# Ok, no UUID still, but that's alright for stop, because it
	# very likely means we never got started -
	if [ "$OP" = "stop" ]; then
		ocf_log warn "$DEVICE: No UUID; assuming never started!"
		OCFS2_UUID="UUID_NOT_SET"
		return 0
	fi

	# Everything else - wrong:
	ocf_log err "$DEVICE: Could not determine ocfs2 UUID for device."
	exit $OCF_ERR_GENERIC
}

ocfs2_init()
{
	# Check & initialize the OCFS2 specific variables.

	if [ $OP != "stop" ]; then
		if [ -z "$OCF_RESKEY_CRM_meta_clone" ]; then
			ocf_log err "ocfs2 must be run as a clone."
			exit $OCF_ERR_GENERIC
		fi
	fi

	if [ $blockdevice = "no" ]; then
		ocf_log err "$DEVICE: ocfs2 needs a block device instead."
		exit $OCF_ERR_GENERIC
	fi
	
	for f in "$OCF_RESKEY_ocfs2_configfs" /sys/kernel/config/cluster /configfs/cluster ; do
		if [ -n "$f" -a -d "$f" ]; then
			OCFS2_CONFIGFS="$f"
			break
		fi
	done
	if [ ! -d "$OCFS2_CONFIGFS" ]; then
		ocf_log err "ocfs2 needs configfs mounted."
		exit $OCF_ERR_GENERIC
	fi

	ocfs2_set_uuid
	
	if [ -n "$OCF_RESKEY_ocfs2_cluster" ]; then
		OCFS2_CLUSTER=$(echo $OCF_RESKEY_ocfs2_cluster | tr '[a-z]' '[A-Z]')
	else
		OCFS2_CLUSTER=$(find "$OCFS2_CONFIGFS" -maxdepth 1 -mindepth 1 -type d -printf %f 2>/dev/null)
		set -- $OCFS2_CLUSTER
		local n="$#"
		if [ $n -gt 1 ]; then
			ocf_log err "$OCFS2_CLUSTER: several clusters found."
			exit $OCF_ERR_GENERIC
		fi
		if [ $n -eq 0 ]; then
			ocf_log err "$OCFS2_CONFIGFS: no clusters found."
			exit $OCF_ERR_GENERIC
		fi
	fi

	OCFS2_CLUSTER_ROOT="$OCFS2_CONFIGFS/$OCFS2_CLUSTER"
	if [ ! -d "$OCFS2_CLUSTER_ROOT" ]; then
		ocf_log err "$OCFS2_CLUSTER: Cluster doesn't exist. Maybe o2cb hasn't been run?"
		exit $OCF_ERR_GENERIC
	fi
	
	OCFS2_FS_ROOT=$OCFS2_CLUSTER_ROOT/heartbeat/$OCFS2_UUID
}

#
# START: Start up the filesystem
#
Filesystem_start()
{
	if [ "$FSTYPE" = "ocfs2" ]; then
		# "start" now has the notification data available; that
		# we're being started means we didn't get the
		# pre-notification, because we weren't running, so
		# process the information now first.
		ocf_log info "$OCFS2_UUID: Faking pre-notification on start."
		OCF_RESKEY_CRM_meta_notify_type="pre"
		OCF_RESKEY_CRM_meta_notify_operation="start"
		Filesystem_notify
	fi		

	# See if the device is already mounted.
	if Filesystem_status >/dev/null 2>&1 ; then
		ocf_log info "Filesystem $MOUNTPOINT is already mounted."
		return $OCF_SUCCESS
	fi

	if [ "X${HOSTOS}" != "XOpenBSD" ];then
		# Insert SCSI module
		# TODO: This probably should go away. Why should the filesystem
		# RA magically load a kernel module?
		$MODPROBE scsi_hostadapter >/dev/null 2>&1

		if [ -z "$FSTYPE" ]; then
			: No FSTYPE specified, rely on the system has the right file-system support already 
		else
			# Insert Filesystem module
			$MODPROBE $FSTYPE >/dev/null 2>&1
			grep -e "$FSTYPE"'$' /proc/filesystems >/dev/null
			if [ $? -ne 0 ] ; then
				ocf_log err "Couldn't find filesystem $FSTYPE in /proc/filesystems"
				return $OCF_ERR_ARGS
			fi
		fi
	fi

	# Check the filesystem & auto repair.  
	# NOTE: Some filesystem types don't need this step...  Please modify
	#       accordingly

	if [ $blockdevice = "yes" ]; then
		if [ "$DEVICE" != "/dev/null" -a ! -b "$DEVICE" ] ; then
			ocf_log err "Couldn't find device [$DEVICE]. Expected /dev/??? to exist"
			exit $OCF_ERR_ARGS
		fi

		if
		  case $FSTYPE in
		    ext3|reiserfs|reiser4|nss|xfs|jfs|vfat|fat|nfs|cifs|smbfs|ocfs2|lustre)	false;;
		    *)									true;;
		  esac
		then
			ocf_log info  "Starting filesystem check on $DEVICE"
			if [ -z "$FSTYPE" ]; then
				$FSCK -p $DEVICE
			else
				$FSCK -t $FSTYPE -p $DEVICE
			fi

			# NOTE: if any errors at all are detected, it returns non-zero
			# if the error is >= 4 then there is a big problem
			if [ $? -ge 4 ]; then
				ocf_log err "Couldn't sucessfully fsck filesystem for $DEVICE"
				return $OCF_ERR_GENERIC	
			fi	
		fi
	fi

	if [ ! -d "$MOUNTPOINT" ] ; then
		ocf_log err "Couldn't find directory  [$MOUNTPOINT] to use as a mount point"
		exit $OCF_ERR_ARGS
	fi

	flushbufs $DEVICE
	# Mount the filesystem.
	if [ -z "$FSTYPE" ]; then
		$MOUNT $options $DEVICE $MOUNTPOINT
	else
		$MOUNT -t $FSTYPE $options $DEVICE $MOUNTPOINT
        fi

        if [ $? -ne 0 ]; then
		ocf_log err "Couldn't mount filesystem $DEVICE on $MOUNTPOINT"
		if [ "$FSTYPE" = "ocfs2" ]; then
			ocfs2_cleanup
		fi
		return $OCF_ERR_GENERIC
	fi

	return 0
}
# end of Filesystem_start

Filesystem_notify() {
	# Process notifications; this is the essential glue level for
	# giving user-space membership events to a cluster-aware
	# filesystem. Right now, only OCFS2 is supported.
	#
	# When we get a pre-start notification, we set up all the nodes
	# which will be active in our membership for the filesystem.
	# (For the resource to be started, this happens at the time of
	# the actual 'start' operation.)
	#
	# At a post-start, actually there's nothing to do for us really,
	# but no harm done in re-syncing either.
	#
	# pre-stop is meaningless; we can't remove any node yet, it
	# first needs to unmount.
	#
	# post-stop: the node is removed from the membership of the
	# other nodes.
	# 
	# Note that this expects that the base cluster is already
	# active; ie o2cb has been started and populated
	# $OCFS2_CLUSTER_ROOT/node/ already. This can be achieved by
	# simply having o2cb run on all nodes by the CRM too.  This
	# probably ought to be mentioned somewhere in the to be written
	# documentation. ;-)
	#

	if [ "$FSTYPE" != "ocfs2" ]; then
		# One of the cases which shouldn't occur; it should have
		# been caught much earlier. Still, you know ...
		ocf_log warn "$DEVICE: Notification received for non-ocfs2 mount."
		return $OCF_ERR_UNIMPLEMENTED
	fi

	local n_type="$OCF_RESKEY_CRM_meta_notify_type"
	local n_op="$OCF_RESKEY_CRM_meta_notify_operation"
	local n_active="$OCF_RESKEY_CRM_meta_notify_active_uname"
	local n_stop="$OCF_RESKEY_CRM_meta_notify_stop_uname"
	local n_start="$OCF_RESKEY_CRM_meta_notify_start_uname"

	ocf_log info "$OCFS2_UUID: notify: $n_type for $n_op"
	ocf_log info "$OCFS2_UUID: notify active: $n_active"
	ocf_log info "$OCFS2_UUID: notify stop: $n_stop"
	ocf_log info "$OCFS2_UUID: notify start: $n_start"

	case "$n_type" in
	pre)
		case "$n_op" in
		stop)
			ocf_log info "$OCFS2_UUID: ignoring pre-notify for stop."
			return $OCF_SUCCESS
			;;
		start)
			# These are about to become active; prepare to
			# communicate with them.
			# Duplicate removal - start can contain nodes
			# already on the active list, confusing the
			# script later on:
			for UNAME in $n_active; do
				n_start=`echo ${n_start} | sed s/$UNAME//`
			done
			# Merge pruned lists again:
			n_active="$n_active $n_start"
			;;
		esac
		;;
	post)
		case "$n_op" in
		stop)
			# remove unames from notify_stop_uname; these have been
			# stopped and can no longer be considered active.
			for UNAME in $n_stop; do
				n_active=`echo ${n_active} | sed s/$UNAME//`
			done
			;;
		start)
			if [ "$n_op" = "start" ]; then
				ocf_log info "$OCFS2_UUID: ignoring post-notify for start."
				return $OCF_SUCCESS
			fi
			;;
		esac
		;;
	esac

	ocf_log info "$OCFS2_UUID: post-processed active: $n_active"

	local n_myself=${HA_CURHOST:-$(uname -n | tr '[A-Z]' '[a-z]')}
	ocf_log info "$OCFS2_UUID: I am node $n_myself."

	case " $n_active " in
	*" $n_myself "*) ;;
	*)	ocf_log err "$OCFS2_UUID: $n_myself (local) not on active list!"
		return $OCF_ERR_GENERIC
		;;
	esac

	if [ -d "$OCFS2_FS_ROOT" ]; then
	entry_prefix=$OCFS2_FS_ROOT/
	for entry in $OCFS2_FS_ROOT/* ; do
		n_fs="${entry##$entry_prefix}"
		# ocf_log info "$OCFS2_UUID: Found current node $n_fs"
		case " $n_active " in
		*" $n_fs "*)
			# Construct a list of nodes which are present
			# already in the membership.
			n_exists="$n_exists $n_fs"
			ocf_log info "$OCFS2_UUID: Keeping node: $n_fs"
			;;
		*)
			# Node is in the membership currently, but not on our 
			# active list. Must be removed.
			if [ "$n_op" = "start" ]; then
				ocf_log warn "$OCFS2_UUID: Removing nodes on start"
			fi
			ocf_log info "$OCFS2_UUID: Removing dead node: $n_fs"
			if ! rm -f $entry ; then
				ocf_log err "$OCFS2_UUID: Removal of $n_fs failed!"
			fi
			;;
		esac
	done
	else
		ocf_log info "$OCFS2_UUID: heartbeat directory doesn't exist yet, creating."
		mkdir -p $OCFS2_FS_ROOT
	fi

	ocf_log info "$OCFS2_UUID: Existing node list: $n_exists"
	
	# (2)
	for entry in $n_active ; do
		# ocf_log info "$OCFS2_UUID: Expected active node: $entry"
		case " $n_exists " in
		*" $entry "*)
			ocf_log info "$OCFS2_UUID: Already active: $entry"
			;;
		*)
			if [ "$n_op" = "stop" ]; then
				ocf_log warn "$OCFS2_UUID: Adding nodes on stop"
			fi
			ocf_log info "$OCFS2_UUID: Activating node: $entry"
			if ! ln -s $OCFS2_CLUSTER_ROOT/node/$entry $OCFS2_FS_ROOT/$entry ; then
				ocf_log err "$OCFS2_CLUSTER_ROOT/node/$entry: failed to link"
			fi
			;;
		esac
	done
}

#
# STOP: Unmount the filesystem
#
Filesystem_stop()
{
	# See if the device is currently mounted
	Filesystem_status >/dev/null 2>&1
	if [ $? -eq $OCF_NOT_RUNNING ]; then
		# Already unmounted, wonderful.
		rc=$OCF_SUCCESS
	else
		# Determine the real blockdevice this is mounted on (if
		# possible) prior to unmounting.
		determine_blockdevice

		# For networked filesystems, there's merit in trying -f:
		case "$FSTYPE" in
		nfs|cifs|smbfs) umount_force="-f" ;;
		esac

		# Umount all sub-filesystems mounted under $MOUNTPOINT/ too.
		for SUB in `list_submounts $MOUNTPOINT` $MOUNTPOINT; do
			ocf_log info "Trying to unmount $MOUNTPOINT"
			for sig in SIGTERM SIGTERM SIGTERM SIGKILL SIGKILL SIGKILL; do
				if $UMOUNT $umount_force $SUB ; then
					rc=$OCF_SUCCESS
					ocf_log info "unmounted $SUB successfully"
					break
				else
					rc=$OCF_ERR_GENERIC
					ocf_log err "Couldn't unmount $SUB; trying cleanup with $sig"
					# fuser returns a non-zero return code if none of the
					# specified files is accessed or in case of a fatal 
					# error.
					if [ "X${HOSTOS}" = "XOpenBSD" ];then
						PIDS=`fstat | grep ${SUB} | awk '{print $3}'`
						for PID in ${PIDS};do
							kill -9 ${PID}
							ocf_log info "Sent kill -9 to ${PID}"
						done
					else
						if $FUSER -$sig -m -k $SUB ; then
							ocf_log info "Some processes on $SUB were signalled"
						else
							ocf_log info "No processes on $SUB were signalled"
						fi
					fi
					sleep 1
				fi
			done

			if [ $rc -ne $OCF_SUCCESS ]; then
				ocf_log err "Couldn't unmount $SUB, giving up!"
			fi
		done
	fi

	flushbufs $DEVICE

	if [ "$FSTYPE" = "ocfs2" ]; then
		ocfs2_init
		ocfs2_cleanup
	fi

	return $rc
}
# end of Filesystem_stop

#
# STATUS: is the filesystem mounted or not?
#
Filesystem_status()
{
	if list_mounts | grep -q " $MOUNTPOINT " >/dev/null 2>&1; then
		rc=$OCF_SUCCESS
		msg="$MOUNTPOINT is mounted (running)"
        else
		rc=$OCF_NOT_RUNNING
		msg="$MOUNTPOINT is unmounted (stopped)"
        fi

	# TODO: For ocfs2, or other cluster filesystems, should we be
	# checking connectivity to other nodes here, or the IO path to
	# the storage?
	
	# Special case "monitor" to check whether the UUID cached and
	# on-disk still match?
	
        case "$OP" in
	status)	ocf_log info "$msg";;
	esac

        return $rc
}
# end of Filesystem_status

#
# VALIDATE_ALL: Are the instance parameters valid?
#	FIXME!!  The only part that's useful is the return code.
#	This code always returns $OCF_SUCCESS (!)
#
Filesystem_validate_all()
{
	if [ -n $MOUNTPOINT -a ! -d $MOUNTPOINT ]; then
		ocf_log warn "Mountpoint $MOUNTPOINT does not exist"
	fi

	# Check if the $FSTYPE is workable
	# NOTE: Without inserting the $FSTYPE module, this step may be imprecise
	# TODO: This is Linux specific crap.
	if [ ! -z "$FSTYPE" ]; then
		cut -f2 /proc/filesystems |grep -q ^$FSTYPE$
		if [ $? -ne 0 ]; then
			modpath=/lib/modules/`uname -r` 
			moddep=$modpath/modules.dep
			# Do we have $FSTYPE in modules.dep?
			cut -d' ' -f1 $moddep |grep -q "^$modpath.*$FSTYPE\.k\?o:$"
			if [ $? -ne 0 ]; then
				ocf_log info "It seems we do not have $FSTYPE support"
			fi
		fi
	fi

	#TODO: How to check the $options ?
	return $OCF_SUCCESS
}

# Check the arguments passed to this script
if [ $# -ne 1 ]; then
	usage
	exit $OCF_ERR_ARGS
fi

# Check the OCF_RESKEY_ environment variables...
DEVICE=$OCF_RESKEY_device
FSTYPE=$OCF_RESKEY_fstype
if [ ! -z "$OCF_RESKEY_options" ]; then
	options="-o $OCF_RESKEY_options"
fi

OP=$1

# These operations do not require instance parameters
case $OP in
meta-data)	meta_data
		exit $OCF_SUCCESS
		;;
usage)		usage
		exit $OCF_SUCCESS
		;;
esac

blockdevice=no
case $DEVICE in
"")	ocf_log err "Please set OCF_RESKEY_device to the device to be managed"
	exit $OCF_ERR_ARGS
	;;
-*) # Oh... An option to mount instead...  Typically -U or -L
	;;
[^/]*:/*)	# An NFS filesystem specification...
	;;
//[^/]*/*)	# An SMB filesystem specification...
	;;
/dev/null)	# Special case for BSC
	blockdevice=yes
	;;
*)	if [ ! -b "$DEVICE"  -a ! -d "$DEVICE" -a "X$OP" != Xstart ] ; then
		ocf_log warn "Couldn't find device [$DEVICE]. Expected /dev/??? to exist"
	fi
	if [ ! -d "$DEVICE" ];then
		blockdevice=yes
	fi
	;;
esac


# Normalize instance parameters:

# It is possible that OCF_RESKEY_directory has one or even multiple trailing "/".
# But the output of `mount` and /proc/mounts do not.
if [ -z "$OCF_RESKEY_directory" ]; then
	if [ X$OP = "Xstart" -o $blockdevice = "no" ]; then
		ocf_log err "Please specify the directory"
		exit $OCF_ERR_ARGS 
	fi
else
	MOUNTPOINT=$(echo $OCF_RESKEY_directory | sed 's/\/*$//')
	: ${MOUNTPOINT:=/}
	# At this stage, $MOUNTPOINT does not contain trailing "/" unless it is "/"
	# TODO: / mounted via Filesystem sounds dangerous. On stop, we'll
	# kill the whole system. Is that a good idea?
fi
	
# Check to make sure the utilites are found
if [ "X${HOSTOS}" != "XOpenBSD" ];then
check_binary $MODPROBE
check_binary $FUSER
fi
check_binary $FSCK
check_binary $MOUNT
check_binary $UMOUNT

if [ "$OP" != "monitor" ]; then
	ocf_log info "Running $OP for $DEVICE on $MOUNTPOINT"
fi

# These operations do not require the clone checking + OCFS2
# initialization.
case $OP in
status|monitor)	Filesystem_status
		exit $?
		;;
validate-all)	Filesystem_validate_all
		exit $?
		;;
stop)		Filesystem_stop
		exit $?
		;;
esac

case $FSTYPE in
ocfs2)	ocfs2_init
	;;
nfs)	: # this is kind of safe too
	;;
*)	if [ -n "$OCF_RESKEY_CRM_meta_clone" ]; then
		ocf_log err "DANGER! $FSTYPE on $DEVICE is NOT cluster-aware!"
		ocf_log err "DO NOT RUN IT AS A CLONE!"
		ocf_log err "Politely refusing to proceed to avoid data corruption."
		exit $OCF_ERR_GENERIC	
	fi
	;;
esac

case $OP in
start)	Filesystem_start
	;;
notify)	Filesystem_notify
	;;
*)	usage
	exit $OCF_ERR_UNIMPLEMENTED
	;;
esac
exit $?