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# This is library of helper functions that can be used in scripts in tuned profiles.
#
# API provided by this library is under heavy development and could be changed anytime
#

#
# Config
#
STORAGE=/run/tuned
STORAGE_PERSISTENT=/var/lib/tuned
STORAGE_SUFFIX=".save"

#
# Helpers
#

# Save value
# $0 STORAGE_NAME VALUE
save_value() {
	[ "$#" -ne 2 ] && return
	[ "$2" -a -e "${STORAGE}" ] && echo "$2" > "${STORAGE}/${1}${STORAGE_SUFFIX}"
}

# Parse sysfs value, i.e. for "val1 [val2] val3" return "val2"
# $0 SYSFS_NAME
parse_sys() {
	local V1 V2
	[ -r "$1" ] || return
	V1=`cat "$1"`
	V2="${V1##*[}"
	V2="${V2%%]*}"
	echo "${V2:-$V1}"
}

# Save sysfs value
# $0 STORAGE_NAME SYSFS_NAME
save_sys() {
	[ "$#" -ne 2 ] && return
	[ -r "$2" -a ! -e "${STORAGE}/${1}${STORAGE_SUFFIX}" ] && parse_sys "$2" > "${STORAGE}/${1}${STORAGE_SUFFIX}"
}

# Set sysfs value
# $0 SYSFS_NAME VALUE
set_sys() {
	[ "$#" -ne 2 ] && return
	[ -w "$1" ] && echo "$2" > "$1"
}

# Save and set sysfs value
# $0 STORAGE_NAME SYSFS_NAME VALUE
save_set_sys() {
	[ "$#" -ne 3 ] && return
	save_sys "$1" "$2"
	set_sys "$2" "$3"
}

# Get stored sysfs value from storage
# $0 STORAGE_NAME
get_stored_sys() {
	[ "$#" -ne 1 ] && return
	[ -r "${STORAGE}/${1}${STORAGE_SUFFIX}" ] && cat "${STORAGE}/${1}${STORAGE_SUFFIX}"
}

# Restore value from storage
# $0 STORAGE_NAME
restore_value() {
	[ "$#" -ne 1 ] && return
	_rs_value="`get_stored_sys \"$1\"`"
	unlink "${STORAGE}/${1}${STORAGE_SUFFIX}" >/dev/null 2>&1
	[ "$_rs_value" ] && echo "$_rs_value"
}

# Restore sysfs value from storage, if nothing is stored, use VALUE
# $0 STORAGE_NAME SYSFS_NAME [VALUE]
restore_sys() {
	[ "$#" -lt 2 -o "$#" -gt 3 ] && return
	_rs_value="`get_stored_sys \"$1\"`"
	unlink "${STORAGE}/${1}${STORAGE_SUFFIX}" >/dev/null 2>&1
	[ "$_rs_value" ] || _rs_value="$3"
	[ "$_rs_value" ] && set_sys "$2" "$_rs_value"
}


#
# DISK tuning
#

DISKS_DEV="$(command ls -d1 /dev/[shv]d*[a-z] 2>/dev/null)"
DISKS_SYS="$(command ls -d1 /sys/block/{sd,cciss,dm-,vd,dasd,xvd}* 2>/dev/null)"

_check_elevator_override()
{
	/bin/fgrep -q 'elevator=' /proc/cmdline
}

# $0 OPERATOR DEVICES ELEVATOR
_set_elevator_helper() {
	_check_elevator_override && return
	SYS_BLOCK_SDX=""
	[ "$2" ] && SYS_BLOCK_SDX=$(eval LANG=C /bin/ls -1 "${2}" 2>/dev/null)

	# if there is no kernel command line elevator settings, apply the elevator
	if [ "$1" -a "$SYS_BLOCK_SDX" ]; then
		for i in $SYS_BLOCK_SDX; do
			se_dev="`echo \"$i\" | sed 's|/sys/block/\([^/]\+\)/queue/scheduler|\1|'`"
			$1 "elevator_${se_dev}" "$i" "$3"
		done
	fi
}

# $0 DEVICES ELEVATOR
set_elevator() {
	_set_elevator_helper save_set_sys "$1" "$2"
}

# $0 DEVICES [ELEVATOR]
restore_elevator() {
	re_elevator="$2"
	[ "$re_elevator" ] || re_elevator=cfq
	_set_elevator_helper restore_sys "$1" "$re_elevator"
}

# SATA Aggressive Link Power Management
# usage: set_disk_alpm policy
set_disk_alpm() {
	policy=$1

        for host in /sys/class/scsi_host/*; do
                if [ -f $host/ahci_port_cmd ]; then
                        port_cmd=`cat $host/ahci_port_cmd`;
                        if [ $((0x$port_cmd & 0x240000)) = 0 -a -f $host/link_power_management_policy ]; then
                                echo $policy >$host/link_power_management_policy;
                        else
                                echo "max_performance" >$host/link_power_management_policy;
                        fi
                fi
        done
}

# usage: set_disk_apm level
set_disk_apm() {
	level=$1
	for disk in $DISKS_DEV; do
		hdparm -B $level $disk &>/dev/null
	done
}

# usage: set_disk_spindown level
set_disk_spindown() {
	level=$1
	for disk in $DISKS_DEV; do
		hdparm -S $level $disk &>/dev/null
	done
}

# usage: multiply_disk_readahead by
multiply_disk_readahead() {
	by=$1

	# float multiplication not supported in bash
	# bc