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#!/bin/sh
#
# Called from udev
#
# Set the read_ahead cache size of SD card on hotplug
SYSNAME=$(uname -n)
DISKNUM=$(echo $DEVNAME | sed -e 's/\(^.*\)\(.$\)/\2/')
DISKNAME=$(echo $DEVNAME | sed 's/.*\///g;s/p.*//g')
CORES=$(cat /proc/cpuinfo | grep processor | wc -l)
set_read_ahead_size () {
if [ $DISKNUM == "0" ]; then #eMMC
echo $1 > /sys/block/$DISKNAME/queue/read_ahead_kb
else #SD card
echo $2 > /sys/block/$DISKNAME/queue/read_ahead_kb
fi
}
if [ "$ACTION" = "add" ] && [ -n "$DEVNAME" ] && [ "$DEVTYPE" = "disk" ]; then
#Set read_ahead cache of mmcblk? SD card
if test -e /sys/block/$DISKNAME/queue/read_ahead_kb
then
if [ $SYSNAME == "colibri-imx6" ]; then
if [ $CORES -eq 1 ]; then #imx6s
set_read_ahead_size 512 512
else #imx6dl
set_read_ahead_size 1024 512
fi
elif [ $SYSNAME == "apalis-imx6" ]; then
if [ $CORES -eq 2 ]; then #imx6d
set_read_ahead_size 1024 512
else #imx6q
set_read_ahead_size 1024 512
fi
elif [ $SYSNAME == "apalis-tk1" ]; then
set_read_ahead_size 4096 1024
else
logger "sd_hotplug.sh" "System name not compatible"
fi
else
logger "sd_hotplug" "No read_ahead_kb configuration file found"
fi
fi
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