laptop-mode-tools_1.52/usr/share/laptop-mode-tools/modules/laptop-mode - chromiumos/third_party/laptop-mode-tools - Git at Google

 #! /bin/sh
 #
 # Laptop mode tools module: core laptop mode functionality
 #

 # Remove an option (the first parameter) of the form option=<number> from
 # a mount options string (the rest of the parameters).
 remove_numeric_mount_option () {
 	OPT="$1"
 	shift
 	echo ",$*," | sed		\
 	 -e 's|,'"$OPT"'=[0-9]*,|,|g'	\
 	 -e 's/,,*/,/g'			\
 	 -e 's/^,//'			\
 	 -e 's/,$//'
 }

 # Remove an option (the first parameter) without any arguments from
 # a mount option string (the rest of the parameters).
 remove_fixed_mount_option () {
 	OPT="$1"
 	shift
 	echo ",$*," | sed		\
 	 -e 's|,'"$OPT"',|,|g'		\
 	 -e 's/,,*/,/g'			\
 	 -e 's/^,//'			\
 	 -e 's/,$//'
 }

 # Find out the state of an atime option ("atime"/"noatime"/"relatime"/"norelatime")
 # in a set of mount options, and use this state to replace the value of the
 # option in another mount options string.
 #
 # Example:
 # replace_atime_mount_option defaults,user=1000,atime defaults,noatime
 #
 # This yields "defaults,atime".
 replace_atime_mount_option () {
 	REPLACEMENT_OPTS="$1"
 	OPTS="$2"
 	PARSEDOPTS="$(remove_fixed_mount_option atime $OPTS)"
 	PARSEDOPTS="$(remove_fixed_mount_option noatime $PARSEDOPTS)"
 	PARSEDOPTS="$(remove_fixed_mount_option relatime $PARSEDOPTS)"
 	PARSEDOPTS="$(remove_fixed_mount_option norelatime $PARSEDOPTS)"

 	case ",$REPLACEMENT_OPTS," in
 	*",relatime,"*)
 		echo "$PARSEDOPTS,relatime"
 		;;
 	*",noatime,"*)
 		echo "$PARSEDOPTS,noatime"
 		;;
 	*)
 		# Kind of strange: to go from relatime to atime, we have to
 		# explicitly specify norelatime.
 	 	echo "$PARSEDOPTS,atime,norelatime"
 	 	;;
 	esac
 }

 # Find out the state of a numbered option (e.g. "commit=NNN") in
 # a set of options, and use this state to replace the
 # value of the option in another mount options string.
 #
 # Example:
 # replace_numeric_mount_option commit defaults,user=1000,commit=3 defaults,commit=7
 #
 # This example yields "defaults,commit=3".
 replace_numeric_mount_option () {
 	OPT="$1"
 	DEF_OPT="$2"
 	REPLACEMENT_OPTS="$3"
 	OPTS="$4"
 	PARSEDOPTS="$(remove_numeric_mount_option $OPT $OPTS)"

 	if echo ",$REPLACEMENT_OPTS," | grep ",$OPT=[0123456789]+," > /dev/null ; then
 		echo -n "$PARSEDOPTS,$OPT="
 		echo ",$REPLACEMENT_OPTS," | sed \
 		 -e 's/.*,'"$OPT"'=//'	\
 		 -e 's/,.*//'
 	else
 		# Option not present in REPLACEMENT_OPTS: use the default.
 		echo "$PARSEDOPTS,$DEF_OPT"
 	fi
 }

 deduce_fstype () {
 	MP="$1"
 	# My root filesystem unfortunately has type "unknown" in
 	# /etc/mtab. If we encounter "unknown", we try to get the
 	# type from fstab. This still might be wrong, in which
 	# case the code further down will issue a big warning.
 	sed 's/[[:space:]]*#.*$//' /etc/fstab |
 	while read FSTAB_DEV FSTAB_MP FSTAB_FST FSTAB_OPTS FSTAB_DUMP FSTAB_DUMP ; do
 		if [ "$FSTAB_MP" = "$MP" ]; then
 			echo "$FSTAB_FST"
 			exit 0
 		fi
 	done
 }


 #
 # Set kernel setting, showing an error if this fails.
 #
 # Parameter 1: sysctl/proc path
 # Parameter 2: the value
 #
 set_sysctl() {
 	log "VERBOSE" "Executing: echo $2 > $1"
 	if ! echo "$2" > "$1" ; then
 		log "MSG" "SETTING OF KERNEL PARAMETER FAILED: echo $2 \> $1"
 	fi
 }


 if [ "$CONTROL_READAHEAD" -ne 0 ] ; then
 	if /sbin/blockdev --help 2>&1 | grep -Fq -- '--setfra' ; then
 		READAHEAD_OPTION=--setfra
 	else
 		READAHEAD_OPTION=--setra
 		if [ "$KLEVEL" = "2.4" ] ; then
 			log "MSG" "Warning: Running a 2.4 kernel with blockdev that does not support --setfra."
 			log "MSG" "File system readahead will not function properly."
 		fi
 	fi
 fi


 if [ $CONTROL_NOATIME -eq 1 ] ; then
 	if [ "$KLEVEL" = "2.4" ] ; then
 		log "VERBOSE" "Relatime is not supported on 2.4 kernels. Using noatime instead"
 		USE_RELATIME=0
 	elif [ "$KLEVEL" = "2.6" -a "$KMINOR" -lt 23 ] ; then
 		log "VERBOSE" "Relatime is not supported on kernels before 2.6.23. Using noatime instead."
 		USE_RELATIME=0
 	fi
 	if [ "$USE_RELATIME" = 1 ] ; then
 		NOATIME_OPT=",relatime"
 	else
 		NOATIME_OPT=",noatime"
 	fi
 fi


 # Adjust kernel settings and mount options (but only if data loss
 # sensitive features are active)
 if [ "$ACTIVATE_WITH_POSSIBLE_DATA_LOSS" -eq 1 ] ; then
 	# Take MAX_LOST_WORK_SECONDS from LM_BATT_MAX_LOST_WORK_SECONDS or LM_AC_MAX_LOST_WORK_SECONDS_WITH_LM, depending on power state.
 	MAX_LOST_WORK_SECONDS=$LM_BATT_MAX_LOST_WORK_SECONDS
 	if [ $ON_AC -eq 1 ] ; then
 		MAX_LOST_WORK_SECONDS=$LM_AC_MAX_LOST_WORK_SECONDS
 	fi

 	AGE=$((100*$MAX_LOST_WORK_SECONDS))
 	XFS_AGE=$(($XFS_HZ*$MAX_LOST_WORK_SECONDS))

 	if [ -d /proc/sys/vm/pagebuf ] ; then
 		# (For 2.4 and early 2.6.)
 		# This only needs to be set, not reset -- it is only used when
 		# laptop mode is enabled.
 		log "VERBOSE" "Adjusting XFS kernel parameters for 2.4 and early 2.6 kernels."
 		set_sysctl /proc/sys/vm/pagebuf/lm_flush_age  $XFS_AGE
 		set_sysctl /proc/sys/fs/xfs/lm_sync_interval  $XFS_AGE
 	elif [ -f /proc/sys/fs/xfs/lm_age_buffer ] ; then
 		# (A couple of early 2.6 laptop mode patches had these.)
 		# This only needs to be set, not reset -- it is only used when
 		# laptop mode is enabled.
 		log "VERBOSE" "Adjusting XFS kernel parameters for early patched 2.6 kernels."
 		set_sysctl /proc/sys/fs/xfs/lm_age_buffer    $XFS_AGE
 		set_sysctl /proc/sys/fs/xfs/lm_sync_interval $XFS_AGE
 	elif [ -f /proc/sys/fs/xfs/age_buffer ] ; then
 		# (2.6.6)
 		# But not for these -- they are also used in normal
 		# operation.
 		log "VERBOSE" "Adjusting XFS kernel parameters for 2.6.6 kernel."
 		set_sysctl /proc/sys/fs/xfs/age_buffer       $XFS_AGE
 		set_sysctl /proc/sys/fs/xfs/sync_interval    $XFS_AGE
 	elif [ -f /proc/sys/fs/xfs/age_buffer_centisecs ] ; then
 		# (2.6.7 upwards)
 		# And not for these either. These are in centisecs,
 		# not USER_HZ, so we have to use $AGE, not $XFS_AGE.
 		log "VERBOSE" "Adjusting XFS kernel parameters for >2.6.7 kernel."
 		set_sysctl /proc/sys/fs/xfs/age_buffer_centisecs  $AGE
 		set_sysctl /proc/sys/fs/xfs/xfssyncd_centisecs    $AGE
 		set_sysctl /proc/sys/fs/xfs/xfsbufd_centisecs     3000
 	fi

 	case "$KLEVEL" in
 		"2.4")
 			log "VERBOSE" "Adjusting 2.4 kernel parameters to enable laptop mode."
 			set_sysctl /proc/sys/vm/laptop_mode   1
 			set_sysctl /proc/sys/vm/bdflush       "30 500 0 0 $AGE $AGE 60 20 0"
 			;;
 		"2.6")
 			log "VERBOSE" "Adjusting 2.6 kernel parameters to enable laptop mode."
 			set_sysctl /proc/sys/vm/laptop_mode		  "$LM_SECONDS_BEFORE_SYNC"
 			set_sysctl /proc/sys/vm/dirty_writeback_centisecs "$AGE"
 			set_sysctl /proc/sys/vm/dirty_expire_centisecs    "$AGE"
 			set_sysctl /proc/sys/vm/dirty_ratio		  "$LM_DIRTY_RATIO"
 			set_sysctl /proc/sys/vm/dirty_background_ratio    "$LM_DIRTY_BACKGROUND_RATIO"
 			;;
 	esac
 	if [ $CONTROL_MOUNT_OPTIONS -eq 1 ]; then
 		log "VERBOSE" "Remounting filesystems."
 		# The -r flag makes 'read' preserve backslashes read from
 		# mtab. Spaces are represented by \040 in mtab. (also UTF-8)
 		cat /etc/mtab | while read -r DEV MP FST OPTS DUMP PASS ; do
 			# Now expand the escapes, inside quotes to preserve the spaces :)
 			MP="$(echo $MP)"
 			case "$FST" in
 				rootfs|unionfs|tmpfs|squashfs|sysfs|usbfs|proc|devpts)
 				  	continue
 					;;
 			esac

 			DO=0

 			case " $PARTITIONS " in
 				*" $DEV "*)
 					DO=1
 					log "VERBOSE" "$DEV found in PARTITIONS."
 					;;
 				*)
 					log "VERBOSE" "$DEV not found in PARTITIONS."
 					;;
 			esac
 			case " $PARTITIONS " in
 				*" $MP "*)
 					DO=1
 					log "VERBOSE" "$MP found in PARTITIONS."
 					;;
 				*)
 					log "VERBOSE" "$MP not found in PARTITIONS."
 			esac
 			case " $PARTITIONS " in
 				*" auto "*)
 					log "VERBOSE" "Checking $DEV against HD because PARTITIONS contains \"auto\"."
 					for THISHD in $HD ; do
 						log "VERBOSE" "   Considering $THISHD."
 						case " $DEV" in *"$THISHD"*)
 							DO=1
 							log "VERBOSE" "   $DEV contains $THISHD, which is in HD, so we will remount it."
 							break
 							;;
 						esac
 					done
 					;;
 			esac
 			if [ "$DO" -ne 0 ] ; then
 				log "VERBOSE" "Original options: $OPTS"
 				if [ "$WAS_ACTIVE" -eq 0 ] ; then
 					# Coming from inactive state: save last known mount options for the device.
 					log "VERBOSE" "Updating /var/run/laptop-mode-tools/nolm-mountopts."
 					if [ -f /var/run/laptop-mode-tools/nolm-mountopts ] ; then
 						sed -i "s|^$DEV .*$||" /var/run/laptop-mode-tools/nolm-mountopts
 					fi
 					echo $DEV $OPTS >> /var/run/laptop-mode-tools/nolm-mountopts
 				else
 					log "VERBOSE" "Not updating /var/run/laptop-mode-tools/nolm-mountopts because laptop mode was already active."
 				fi
 				if [ "$FST" = 'unknown' ]; then
 					log "VERBOSE" "Deducing fstype for $MP."
 					FST=$(deduce_fstype $MP)
 					log "VERBOSE" "Deduced fstype for $MP as $FST."
 				fi
 				# Strip stuff like ext3,ext2 into just ext3.
 				log "VERBOSE" "Reducing file system type."
 				FST=${FST%%,*}
 				case "$FST" in
 					"ext3"|"reiserfs"|"ext4dev"|"ext4")
 						log "VERBOSE" "Removing commit mount option from original options."
 						PARSEDOPTS="$(remove_numeric_mount_option commit "$OPTS")"
 						log "VERBOSE" "Executing: mount $DEV $MP -t $FST -o remount,$PARSEDOPTS,commit=$MAX_LOST_WORK_SECONDS$NOATIME_OPT"
 						if (! mount $DEV "$MP" -t $FST -o remount,$PARSEDOPTS,commit=$MAX_LOST_WORK_SECONDS$NOATIME_OPT) ; then
 							if [ "$FST" = "ext3" -a "$MP" = "/" ] ; then
 								echo "BIG FAT WARNING: Your root filesystem mounted as ext3 seems to lack support for"
 								echo "the commit mount option. This usually means that your root filesystem is"
 								echo "mounted as ext2 because there is no ext3 support in the kernel at boot time,"
 								echo "usually because you compiled ext3 as a module and don't load it in an initrd."
 								echo "Note that on recent 2.6 kernels, /proc/mounts shows the correct fs type for"
 								echo "the device /dev/root. You can check your actual root filesystem mount type"
 								echo "there. To fix the problem, either make ext3 available at boot time by compiling"
 								echo "it statically into the kernel, or configure the correct filesystem type in"
 								echo "/etc/fstab."
 							fi
 						fi
 						;;
 					*)
 						log "VERBOSE" "Executing: mount $DEV $MP -t $FST -o remount,$OPTS$NOATIME_OPT"
 						mount $DEV "$MP" -t $FST -o remount,$OPTS$NOATIME_OPT
 						;;
 				esac
 				if [ -b $DEV -a "$CONTROL_READAHEAD" -ne 0 ] ; then
 					log "VERBOSE" "Executing: /sbin/blockdev $READAHEAD_OPTION $(($LM_READAHEAD * 2)) $DEV"
 					log "VERBOSE" "`/sbin/blockdev $READAHEAD_OPTION $(($LM_READAHEAD * 2)) $DEV 2>&1`"
 				fi
 			fi
 		done
 	fi
 else
 	# DEACTIVATE w.r.t. kernel options and mount point settings
 	U_AGE=$((100*$DEF_UPDATE))
 	B_AGE=$((100*$DEF_MAX_AGE))
 	set_sysctl /proc/sys/vm/laptop_mode 0
 	if [ -f /proc/sys/fs/xfs/age_buffer -a ! -f /proc/sys/fs/xfs/lm_age_buffer ] ; then
 		# These need to be restored, if there are no lm_*.
 		log "VERBOSE" "Restoring default XFS settings (pre-centisecs version)."
 		set_sysctl /proc/sys/fs/xfs/age_buffer    $(($XFS_HZ*$DEF_XFS_AGE_BUFFER))
 		set_sysctl /proc/sys/fs/xfs/sync_interval $(($XFS_HZ*$DEF_XFS_SYNC_INTERVAL))
 	elif [ -f /proc/sys/fs/xfs/age_buffer_centisecs ] ; then
 		# These need to be restored as well.
 		log "VERBOSE" "Restoring default XFS settings."
 		set_sysctl /proc/sys/fs/xfs/age_buffer_centisecs  $((100*$DEF_XFS_AGE_BUFFER))
 		set_sysctl /proc/sys/fs/xfs/xfssyncd_centisecs    $((100*$DEF_XFS_SYNC_INTERVAL))
 		set_sysctl /proc/sys/fs/xfs/xfsbufd_centisecs     $((100*$DEF_XFS_BUFD_INTERVAL))
 	fi
 	case "$KLEVEL" in
 		"2.4")
 			log "VERBOSE" "Adjusting 2.4 kernel parameters to disable laptop mode."
 			set_sysctl /proc/sys/vm/bdflush "30 500 0 0 $U_AGE $B_AGE 60 20 0"
 			;;
 		"2.6")
 			log "VERBOSE" "Adjusting 2.6 kernel parameters to disable laptop mode."
 			set_sysctl /proc/sys/vm/dirty_writeback_centisecs   "$U_AGE"
 			set_sysctl /proc/sys/vm/dirty_expire_centisecs      "$B_AGE"
 			set_sysctl /proc/sys/vm/dirty_ratio		    "$NOLM_DIRTY_RATIO"
 			set_sysctl /proc/sys/vm/dirty_background_ratio	    "$NOLM_DIRTY_BACKGROUND_RATIO"
 			;;
 	esac
 	if [ $CONTROL_MOUNT_OPTIONS -eq 1 ] ; then
 		log "VERBOSE" "Remounting filesystems."
 		# The -r flag makes 'read' preserve backslashes read from
 		# mtab. Spaces are represented by \040 in mtab. (also UTF-8)
 		cat /etc/mtab | while read -r DEV MP FST OPTS DUMP PASS ; do
 			# Now expand the escapes, inside quotes to preserve the spaces :)
 			MP="$(echo $MP)"
 			DO=0
 			case " $PARTITIONS " in
 				*" $DEV "*)
 					DO=1
 					log "VERBOSE" "$DEV found in PARTITIONS."
 					;;
 				*)
 					log "VERBOSE" "$DEV not found in PARTITIONS."
 					;;
 			esac
 			case " $PARTITIONS " in
 				*" $MP "*)
 					DO=1
 					log "VERBOSE" "$MP found in PARTITIONS."
 					;;
 				*)
 					log "VERBOSE" "$MP not found in PARTITIONS."
 					;;
 			esac
 			case " $PARTITIONS " in
 				*" auto "*)
 					log "VERBOSE" "Checking $DEV against HD because PARTITIONS contains \"auto\"."
 					for THISHD in $HD ; do
 						log "VERBOSE" "   Considering $THISHD."
 						case " $DEV" in *"$THISHD"*)
 							DO=1
 							log "VERBOSE" "   $DEV contains $THISHD, which is in HD, so we will remount it."
 							break
 							;;
 						esac
 					done
 					;;
 			esac
 			if [ "$DO" -ne 0 ] ; then
 				# Reset commit and atime options to defaults.
 				log "VERBOSE" "Original options: $OPTS"
 				if [ "$FST" = 'unknown' ]; then
 					log "VERBOSE" "Deducing fstype for $MP."
 					FST=$(deduce_fstype $MP)
 					log "VERBOSE" "Deduced fstype for $MP as $FST."
 				fi

 				# Strip stuff like ext3,ext2 into just ext3.
 				log "VERBOSE" "Reducing file system type."
 				FST=${FST%%,*}

 				# Retrieve original non-laptop mode mount options and restore them.
 				# If the file that stores them doesn't exist, then laptop mode
 				# has never been started.
 				if [ "$WAS_ACTIVE" -ne 0 -a -f /var/run/laptop-mode-tools/nolm-mountopts ] ; then
 					SAVED_OPTS=`grep "^$DEV " /var/run/laptop-mode-tools/nolm-mountopts`
 					SAVED_OPTS=${SAVED_OPTS#* } # trim device name

 					case "$FST" in
 						"ext3"|"reiserfs"|"ext4dev"|"ext4")
 							PARSEDOPTS="$(replace_numeric_mount_option commit commit=0 $SAVED_OPTS $OPTS)"
 							PARSEDOPTS="$(replace_atime_mount_option $SAVED_OPTS $PARSEDOPTS)"
 							log "VERBOSE" "Executing: mount $DEV $MP -t $FST -o remount,$PARSEDOPTS"
 							mount $DEV "$MP" -t $FST -o remount,$PARSEDOPTS
 							;;
 						*)
 							PARSEDOPTS="$(replace_atime_mount_option $SAVED_OPTS $OPTS)"
 							log "VERBOSE" "Executing: mount $DEV $MP -t $FST -o remount,$PARSEDOPTS"
 							mount $DEV "$MP" -t $FST -o remount,$PARSEDOPTS
 							;;
 					esac
 				else
 					log "VERBOSE" "No saved mount options, so apparently we never remounted this filesystem during this session."
 					log "VERBOSE" "Not remounting."
 				fi
 				if [ -b $DEV -a "$CONTROL_READAHEAD" -ne 0 ] ; then
 					log "VERBOSE" "Executing: /sbin/blockdev $READAHEAD_OPTION $(($NOLM_READAHEAD * 2)) $DEV"
 					log "VERBOSE" "`/sbin/blockdev $READAHEAD_OPTION $(($NOLM_READAHEAD * 2)) $DEV 2>&1`"
 				fi
 			fi
 		done
 	fi
 fi
	#! /bin/sh
	#
	# Laptop mode tools module: core laptop mode functionality
	#

	# Remove an option (the first parameter) of the form option=<number> from
	# a mount options string (the rest of the parameters).
	remove_numeric_mount_option () {
	OPT="$1"
	shift
	echo ",$*," \| sed \
	-e 's\|,'"$OPT"'=[0-9]*,\|,\|g' \
	-e 's/,,*/,/g' \
	-e 's/^,//' \
	-e 's/,$//'
	}

	# Remove an option (the first parameter) without any arguments from
	# a mount option string (the rest of the parameters).
	remove_fixed_mount_option () {
	OPT="$1"
	shift
	echo ",$*," \| sed \
	-e 's\|,'"$OPT"',\|,\|g' \
	-e 's/,,*/,/g' \
	-e 's/^,//' \
	-e 's/,$//'
	}

	# Find out the state of an atime option ("atime"/"noatime"/"relatime"/"norelatime")
	# in a set of mount options, and use this state to replace the value of the
	# option in another mount options string.
	#
	# Example:
	# replace_atime_mount_option defaults,user=1000,atime defaults,noatime
	#
	# This yields "defaults,atime".
	replace_atime_mount_option () {
	REPLACEMENT_OPTS="$1"
	OPTS="$2"
	PARSEDOPTS="$(remove_fixed_mount_option atime $OPTS)"
	PARSEDOPTS="$(remove_fixed_mount_option noatime $PARSEDOPTS)"
	PARSEDOPTS="$(remove_fixed_mount_option relatime $PARSEDOPTS)"
	PARSEDOPTS="$(remove_fixed_mount_option norelatime $PARSEDOPTS)"

	case ",$REPLACEMENT_OPTS," in
	",relatime,")
	echo "$PARSEDOPTS,relatime"
	;;
	",noatime,")
	echo "$PARSEDOPTS,noatime"
	;;
	*)
	# Kind of strange: to go from relatime to atime, we have to
	# explicitly specify norelatime.
	echo "$PARSEDOPTS,atime,norelatime"
	;;
	esac
	}

	# Find out the state of a numbered option (e.g. "commit=NNN") in
	# a set of options, and use this state to replace the
	# value of the option in another mount options string.
	#
	# Example:
	# replace_numeric_mount_option commit defaults,user=1000,commit=3 defaults,commit=7
	#
	# This example yields "defaults,commit=3".
	replace_numeric_mount_option () {
	OPT="$1"
	DEF_OPT="$2"
	REPLACEMENT_OPTS="$3"
	OPTS="$4"
	PARSEDOPTS="$(remove_numeric_mount_option $OPT $OPTS)"

	if echo ",$REPLACEMENT_OPTS," \| grep ",$OPT=[0123456789]+," > /dev/null ; then
	echo -n "$PARSEDOPTS,$OPT="
	echo ",$REPLACEMENT_OPTS," \| sed \
	-e 's/.*,'"$OPT"'=//' \
	-e 's/,.*//'
	else
	# Option not present in REPLACEMENT_OPTS: use the default.
	echo "$PARSEDOPTS,$DEF_OPT"
	fi
	}

	deduce_fstype () {
	MP="$1"
	# My root filesystem unfortunately has type "unknown" in
	# /etc/mtab. If we encounter "unknown", we try to get the
	# type from fstab. This still might be wrong, in which
	# case the code further down will issue a big warning.
	sed 's/[[:space:]]#.$//' /etc/fstab \|
	while read FSTAB_DEV FSTAB_MP FSTAB_FST FSTAB_OPTS FSTAB_DUMP FSTAB_DUMP ; do
	if [ "$FSTAB_MP" = "$MP" ]; then
	echo "$FSTAB_FST"
	exit 0
	fi
	done
	}


	#
	# Set kernel setting, showing an error if this fails.
	#
	# Parameter 1: sysctl/proc path
	# Parameter 2: the value
	#
	set_sysctl() {
	log "VERBOSE" "Executing: echo $2 > $1"
	if ! echo "$2" > "$1" ; then
	log "MSG" "SETTING OF KERNEL PARAMETER FAILED: echo $2 \> $1"
	fi
	}


	if [ "$CONTROL_READAHEAD" -ne 0 ] ; then
	if /sbin/blockdev --help 2>&1 \| grep -Fq -- '--setfra' ; then
	READAHEAD_OPTION=--setfra
	else
	READAHEAD_OPTION=--setra
	if [ "$KLEVEL" = "2.4" ] ; then
	log "MSG" "Warning: Running a 2.4 kernel with blockdev that does not support --setfra."
	log "MSG" "File system readahead will not function properly."
	fi
	fi
	fi



	if [ $CONTROL_NOATIME -eq 1 ] ; then
	if [ "$KLEVEL" = "2.4" ] ; then
	log "VERBOSE" "Relatime is not supported on 2.4 kernels. Using noatime instead"
	USE_RELATIME=0
	elif [ "$KLEVEL" = "2.6" -a "$KMINOR" -lt 23 ] ; then
	log "VERBOSE" "Relatime is not supported on kernels before 2.6.23. Using noatime instead."
	USE_RELATIME=0
	fi
	if [ "$USE_RELATIME" = 1 ] ; then
	NOATIME_OPT=",relatime"
	else
	NOATIME_OPT=",noatime"
	fi
	fi


	# Adjust kernel settings and mount options (but only if data loss
	# sensitive features are active)
	if [ "$ACTIVATE_WITH_POSSIBLE_DATA_LOSS" -eq 1 ] ; then
	# Take MAX_LOST_WORK_SECONDS from LM_BATT_MAX_LOST_WORK_SECONDS or LM_AC_MAX_LOST_WORK_SECONDS_WITH_LM, depending on power state.
	MAX_LOST_WORK_SECONDS=$LM_BATT_MAX_LOST_WORK_SECONDS
	if [ $ON_AC -eq 1 ] ; then
	MAX_LOST_WORK_SECONDS=$LM_AC_MAX_LOST_WORK_SECONDS
	fi

	AGE=$((100*$MAX_LOST_WORK_SECONDS))
	XFS_AGE=$(($XFS_HZ*$MAX_LOST_WORK_SECONDS))

	if [ -d /proc/sys/vm/pagebuf ] ; then
	# (For 2.4 and early 2.6.)
	# This only needs to be set, not reset -- it is only used when
	# laptop mode is enabled.
	log "VERBOSE" "Adjusting XFS kernel parameters for 2.4 and early 2.6 kernels."
	set_sysctl /proc/sys/vm/pagebuf/lm_flush_age $XFS_AGE
	set_sysctl /proc/sys/fs/xfs/lm_sync_interval $XFS_AGE
	elif [ -f /proc/sys/fs/xfs/lm_age_buffer ] ; then
	# (A couple of early 2.6 laptop mode patches had these.)
	# This only needs to be set, not reset -- it is only used when
	# laptop mode is enabled.
	log "VERBOSE" "Adjusting XFS kernel parameters for early patched 2.6 kernels."
	set_sysctl /proc/sys/fs/xfs/lm_age_buffer $XFS_AGE
	set_sysctl /proc/sys/fs/xfs/lm_sync_interval $XFS_AGE
	elif [ -f /proc/sys/fs/xfs/age_buffer ] ; then
	# (2.6.6)
	# But not for these -- they are also used in normal
	# operation.
	log "VERBOSE" "Adjusting XFS kernel parameters for 2.6.6 kernel."
	set_sysctl /proc/sys/fs/xfs/age_buffer $XFS_AGE
	set_sysctl /proc/sys/fs/xfs/sync_interval $XFS_AGE
	elif [ -f /proc/sys/fs/xfs/age_buffer_centisecs ] ; then
	# (2.6.7 upwards)
	# And not for these either. These are in centisecs,
	# not USER_HZ, so we have to use $AGE, not $XFS_AGE.
	log "VERBOSE" "Adjusting XFS kernel parameters for >2.6.7 kernel."
	set_sysctl /proc/sys/fs/xfs/age_buffer_centisecs $AGE
	set_sysctl /proc/sys/fs/xfs/xfssyncd_centisecs $AGE
	set_sysctl /proc/sys/fs/xfs/xfsbufd_centisecs 3000
	fi

	case "$KLEVEL" in
	"2.4")
	log "VERBOSE" "Adjusting 2.4 kernel parameters to enable laptop mode."
	set_sysctl /proc/sys/vm/laptop_mode 1
	set_sysctl /proc/sys/vm/bdflush "30 500 0 0 $AGE $AGE 60 20 0"
	;;
	"2.6")
	log "VERBOSE" "Adjusting 2.6 kernel parameters to enable laptop mode."
	set_sysctl /proc/sys/vm/laptop_mode "$LM_SECONDS_BEFORE_SYNC"
	set_sysctl /proc/sys/vm/dirty_writeback_centisecs "$AGE"
	set_sysctl /proc/sys/vm/dirty_expire_centisecs "$AGE"
	set_sysctl /proc/sys/vm/dirty_ratio "$LM_DIRTY_RATIO"
	set_sysctl /proc/sys/vm/dirty_background_ratio "$LM_DIRTY_BACKGROUND_RATIO"
	;;
	esac
	if [ $CONTROL_MOUNT_OPTIONS -eq 1 ]; then
	log "VERBOSE" "Remounting filesystems."
	# The -r flag makes 'read' preserve backslashes read from
	# mtab. Spaces are represented by \040 in mtab. (also UTF-8)
	cat /etc/mtab \| while read -r DEV MP FST OPTS DUMP PASS ; do
	# Now expand the escapes, inside quotes to preserve the spaces :)
	MP="$(echo $MP)"
	case "$FST" in
	rootfs\|unionfs\|tmpfs\|squashfs\|sysfs\|usbfs\|proc\|devpts)
	continue
	;;
	esac

	DO=0

	case " $PARTITIONS " in
	" $DEV ")
	DO=1
	log "VERBOSE" "$DEV found in PARTITIONS."
	;;
	*)
	log "VERBOSE" "$DEV not found in PARTITIONS."
	;;
	esac
	case " $PARTITIONS " in
	" $MP ")
	DO=1
	log "VERBOSE" "$MP found in PARTITIONS."
	;;
	*)
	log "VERBOSE" "$MP not found in PARTITIONS."
	esac
	case " $PARTITIONS " in
	" auto ")
	log "VERBOSE" "Checking $DEV against HD because PARTITIONS contains \"auto\"."
	for THISHD in $HD ; do
	log "VERBOSE" " Considering $THISHD."
	case " $DEV" in "$THISHD")
	DO=1
	log "VERBOSE" " $DEV contains $THISHD, which is in HD, so we will remount it."
	break
	;;
	esac
	done
	;;
	esac
	if [ "$DO" -ne 0 ] ; then
	log "VERBOSE" "Original options: $OPTS"
	if [ "$WAS_ACTIVE" -eq 0 ] ; then
	# Coming from inactive state: save last known mount options for the device.
	log "VERBOSE" "Updating /var/run/laptop-mode-tools/nolm-mountopts."
	if [ -f /var/run/laptop-mode-tools/nolm-mountopts ] ; then
	sed -i "s\|^$DEV .*$\|\|" /var/run/laptop-mode-tools/nolm-mountopts
	fi
	echo $DEV $OPTS >> /var/run/laptop-mode-tools/nolm-mountopts
	else
	log "VERBOSE" "Not updating /var/run/laptop-mode-tools/nolm-mountopts because laptop mode was already active."
	fi
	if [ "$FST" = 'unknown' ]; then
	log "VERBOSE" "Deducing fstype for $MP."
	FST=$(deduce_fstype $MP)
	log "VERBOSE" "Deduced fstype for $MP as $FST."
	fi
	# Strip stuff like ext3,ext2 into just ext3.
	log "VERBOSE" "Reducing file system type."
	FST=${FST%%,*}
	case "$FST" in
	"ext3"\|"reiserfs"\|"ext4dev"\|"ext4")
	log "VERBOSE" "Removing commit mount option from original options."
	PARSEDOPTS="$(remove_numeric_mount_option commit "$OPTS")"
	log "VERBOSE" "Executing: mount $DEV $MP -t $FST -o remount,$PARSEDOPTS,commit=$MAX_LOST_WORK_SECONDS$NOATIME_OPT"
	if (! mount $DEV "$MP" -t $FST -o remount,$PARSEDOPTS,commit=$MAX_LOST_WORK_SECONDS$NOATIME_OPT) ; then
	if [ "$FST" = "ext3" -a "$MP" = "/" ] ; then
	echo "BIG FAT WARNING: Your root filesystem mounted as ext3 seems to lack support for"
	echo "the commit mount option. This usually means that your root filesystem is"
	echo "mounted as ext2 because there is no ext3 support in the kernel at boot time,"
	echo "usually because you compiled ext3 as a module and don't load it in an initrd."
	echo "Note that on recent 2.6 kernels, /proc/mounts shows the correct fs type for"
	echo "the device /dev/root. You can check your actual root filesystem mount type"
	echo "there. To fix the problem, either make ext3 available at boot time by compiling"
	echo "it statically into the kernel, or configure the correct filesystem type in"
	echo "/etc/fstab."
	fi
	fi
	;;
	*)
	log "VERBOSE" "Executing: mount $DEV $MP -t $FST -o remount,$OPTS$NOATIME_OPT"
	mount $DEV "$MP" -t $FST -o remount,$OPTS$NOATIME_OPT
	;;
	esac
	if [ -b $DEV -a "$CONTROL_READAHEAD" -ne 0 ] ; then
	log "VERBOSE" "Executing: /sbin/blockdev $READAHEAD_OPTION $(($LM_READAHEAD * 2)) $DEV"
	log "VERBOSE" "`/sbin/blockdev $READAHEAD_OPTION $(($LM_READAHEAD * 2)) $DEV 2>&1`"
	fi
	fi
	done
	fi
	else
	# DEACTIVATE w.r.t. kernel options and mount point settings
	U_AGE=$((100*$DEF_UPDATE))
	B_AGE=$((100*$DEF_MAX_AGE))
	set_sysctl /proc/sys/vm/laptop_mode 0
	if [ -f /proc/sys/fs/xfs/age_buffer -a ! -f /proc/sys/fs/xfs/lm_age_buffer ] ; then
	# These need to be restored, if there are no lm_*.
	log "VERBOSE" "Restoring default XFS settings (pre-centisecs version)."
	set_sysctl /proc/sys/fs/xfs/age_buffer $(($XFS_HZ*$DEF_XFS_AGE_BUFFER))
	set_sysctl /proc/sys/fs/xfs/sync_interval $(($XFS_HZ*$DEF_XFS_SYNC_INTERVAL))
	elif [ -f /proc/sys/fs/xfs/age_buffer_centisecs ] ; then
	# These need to be restored as well.
	log "VERBOSE" "Restoring default XFS settings."
	set_sysctl /proc/sys/fs/xfs/age_buffer_centisecs $((100*$DEF_XFS_AGE_BUFFER))
	set_sysctl /proc/sys/fs/xfs/xfssyncd_centisecs $((100*$DEF_XFS_SYNC_INTERVAL))
	set_sysctl /proc/sys/fs/xfs/xfsbufd_centisecs $((100*$DEF_XFS_BUFD_INTERVAL))
	fi
	case "$KLEVEL" in
	"2.4")
	log "VERBOSE" "Adjusting 2.4 kernel parameters to disable laptop mode."
	set_sysctl /proc/sys/vm/bdflush "30 500 0 0 $U_AGE $B_AGE 60 20 0"
	;;
	"2.6")
	log "VERBOSE" "Adjusting 2.6 kernel parameters to disable laptop mode."
	set_sysctl /proc/sys/vm/dirty_writeback_centisecs "$U_AGE"
	set_sysctl /proc/sys/vm/dirty_expire_centisecs "$B_AGE"
	set_sysctl /proc/sys/vm/dirty_ratio "$NOLM_DIRTY_RATIO"
	set_sysctl /proc/sys/vm/dirty_background_ratio "$NOLM_DIRTY_BACKGROUND_RATIO"
	;;
	esac
	if [ $CONTROL_MOUNT_OPTIONS -eq 1 ] ; then
	log "VERBOSE" "Remounting filesystems."
	# The -r flag makes 'read' preserve backslashes read from
	# mtab. Spaces are represented by \040 in mtab. (also UTF-8)
	cat /etc/mtab \| while read -r DEV MP FST OPTS DUMP PASS ; do
	# Now expand the escapes, inside quotes to preserve the spaces :)
	MP="$(echo $MP)"
	DO=0
	case " $PARTITIONS " in
	" $DEV ")
	DO=1
	log "VERBOSE" "$DEV found in PARTITIONS."
	;;
	*)
	log "VERBOSE" "$DEV not found in PARTITIONS."
	;;
	esac
	case " $PARTITIONS " in
	" $MP ")
	DO=1
	log "VERBOSE" "$MP found in PARTITIONS."
	;;
	*)
	log "VERBOSE" "$MP not found in PARTITIONS."
	;;
	esac
	case " $PARTITIONS " in
	" auto ")
	log "VERBOSE" "Checking $DEV against HD because PARTITIONS contains \"auto\"."
	for THISHD in $HD ; do
	log "VERBOSE" " Considering $THISHD."
	case " $DEV" in "$THISHD")
	DO=1
	log "VERBOSE" " $DEV contains $THISHD, which is in HD, so we will remount it."
	break
	;;
	esac
	done
	;;
	esac
	if [ "$DO" -ne 0 ] ; then
	# Reset commit and atime options to defaults.
	log "VERBOSE" "Original options: $OPTS"
	if [ "$FST" = 'unknown' ]; then
	log "VERBOSE" "Deducing fstype for $MP."
	FST=$(deduce_fstype $MP)
	log "VERBOSE" "Deduced fstype for $MP as $FST."
	fi

	# Strip stuff like ext3,ext2 into just ext3.
	log "VERBOSE" "Reducing file system type."
	FST=${FST%%,*}

	# Retrieve original non-laptop mode mount options and restore them.
	# If the file that stores them doesn't exist, then laptop mode
	# has never been started.
	if [ "$WAS_ACTIVE" -ne 0 -a -f /var/run/laptop-mode-tools/nolm-mountopts ] ; then
	SAVED_OPTS=`grep "^$DEV " /var/run/laptop-mode-tools/nolm-mountopts`
	SAVED_OPTS=${SAVED_OPTS#* } # trim device name

	case "$FST" in
	"ext3"\|"reiserfs"\|"ext4dev"\|"ext4")
	PARSEDOPTS="$(replace_numeric_mount_option commit commit=0 $SAVED_OPTS $OPTS)"
	PARSEDOPTS="$(replace_atime_mount_option $SAVED_OPTS $PARSEDOPTS)"
	log "VERBOSE" "Executing: mount $DEV $MP -t $FST -o remount,$PARSEDOPTS"
	mount $DEV "$MP" -t $FST -o remount,$PARSEDOPTS
	;;
	*)
	PARSEDOPTS="$(replace_atime_mount_option $SAVED_OPTS $OPTS)"
	log "VERBOSE" "Executing: mount $DEV $MP -t $FST -o remount,$PARSEDOPTS"
	mount $DEV "$MP" -t $FST -o remount,$PARSEDOPTS
	;;
	esac
	else
	log "VERBOSE" "No saved mount options, so apparently we never remounted this filesystem during this session."
	log "VERBOSE" "Not remounting."
	fi
	if [ -b $DEV -a "$CONTROL_READAHEAD" -ne 0 ] ; then
	log "VERBOSE" "Executing: /sbin/blockdev $READAHEAD_OPTION $(($NOLM_READAHEAD * 2)) $DEV"
	log "VERBOSE" "`/sbin/blockdev $READAHEAD_OPTION $(($NOLM_READAHEAD * 2)) $DEV 2>&1`"
	fi
	fi
	done
	fi
	fi