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#!/bin/sh
. "${PM_FUNCTIONS}"
XFS="/proc/sys/fs/xfs"
xfsfiles="age_buffer_centisecs xfssyncd_centisecs xfsbufd_centisecs"
XFS_AGE_BUFFER=${XFS_AGE_BUFFER:-60000}
XFS_BUFD=${XFS_BUFD:-3000}
XFS_SYNCD=${XFS_SYNCD:-60000}
help() {
cat <<EOF
XFS filesystem powersaving parameters:
XFS_AGE_BUFFER = How old an XFS filesystem buffer can be before it is flushed.
Battery value defaults to 60000, or 10 minutes (600 seconds)
XFS_BUFD = How often XFS will scan for dirty metadata to flush it.
Battery value defaults to 3000, or 30 seconds.
XFS_SYNCD = How often an XFS filesystem will perform other filesystem
maintenance, Battery value defaults to 60000, or 10 minutes.
These values only affect powersave on battery, on AC power the system will use
its defaults.
EOF
}
[ -f $XFS/age_buffer_centisecs ] || exit $NA
read_values() {
for f in $xfsfiles; do
[ -r "$XFS/$f" ] && cat "$XFS/$f" || echo 0
done
}
write_values() {
for f in $xfsfiles; do
[ -w "$XFS/$f" ] && echo $1 > "$XFS/$f"
shift
done
}
# Why does XFS have its own parameters instead of just using the
# VM subsystem ones? Only SGI knows...
xfs_ac() {
if state_exists xfs_buffer_default; then
write_values $(restorestate xfs_buffer_default)
else
write_values 1500 3000 100
fi
}
xfs_battery() {
state_exists xfs_buffer_default || \
read_values |savestate xfs_buffer_default
write_values "$XFS_AGE_BUFFER" "$XFS_BUFD" "$XFS_SYNCD"
}
case $1 in
true) xfs_battery ;;
false) xfs_ac ;;
help) help;;
*) exit $NA ;;
esac
exit 0
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