[Android Software/Hacking General [Developers Only]] amarullz:
Ok, thanks, I will learn about it, but there is suspicious thing:

LIST /sd-ext

lrwxrwxrwx 1 0 0 11 Oct 20 13:26 app -> /sd-ext/app
lrwxrwxrwx 1 0 0 19 Oct 20 13:26 app-private -> /sd-ext/app-private

The app should be pointed into /data/app, app-private should be /sd-ext/app-private.

It may happened if you install the mod after system initialized (not clean flash), or if this clean flash, The ROM already create symlink on /data/app, /data/app-private when it flash.

I will try to fix it. i will use readlink / always update the symlink on boot to validate wrong symlink... ( I will check which one faster )

+ i will try to improve performance of boot, and afterboot...

EDIT: OK Klewe, Try the attachment:

#!/system/bin/sh
#
# AMARULLZ DATA TO SD-EXT MOD FOR ANDROID ( AD2SDX )
# ==================================================
#
# by amarullz [at] yahoo [dot] com
# xda-developers : amarullz
# (c) 2011
# * Oct 21 (ALPHA03-TEST-FOR-Klewe)
# * Oct 20 (ALPHA02)
# * Oct 19 (ALPHA01)
#
# Info: ~ For Changing Log
#
# Test for Klewe: Symlink always Update on the boot
##

###
# Initializing
###

#-- SDCard Speed Fix
if [ -e /sys/devices/virtual/bdi/179:0/read_ahead_kb ]
then
/system/xbin/echo "8192" > /sys/devices/virtual/bdi/179:0/read_ahead_kb;
fi;

#-- Unmount /sd-ext if it already mounted
busybox umount /sd-ext;

#-- Mount /data and move it to /sd-ext
busybox mount /data;
busybox mount --move /data /sd-ext;

#-- Mount sd-ext to /data ( You Will Get 1GB/2GB Internal Memory :D )
busybox mount -t ext4 -o noauto_da_alloc,data=ordered,commit=15,barrier=1,nouser_xattr,errors=continue,noatime,nodiratime,nosuid,nodev /dev/block/mmcblk0p2 /data;
busybox chown 1000:1000 /data;
busybox chmod 771 /data;

###[ SDEXT mmcblk0p2 STRICT ]###
# app, app_s, lib_s, app-private, data : should in /data (mmcblk0p2)
#
# ~ ALPHA02 - Add framework_s into (mmcblk0p2) strict
###
for i in framework_s app app_s lib_s app-private data;
do
#-- If Symlink in /data, delete it
if [ -h /data/$i ]
then
busybox rm /data/$i;
fi;

#-- If Directory Exists in /sd-ext, move it to /data
if [ -d /sd-ext/$i ]
then
busybox mv /sd-ext/$i /data/;
fi;

#-- If Directory Not Extst in /data, create it
if [ ! -d /data/$i ]
then
busybox mkdir /data/$i;
#-- Just Open All Permissions ;)
busybox chmod 0777 /data/$i;
fi;

#-- Update Symlinks ( reupdate was safer )
if [ -h /sd-ext/$i ]
then
busybox rm /sd-ext/$i;
fi;
busybox ln -s /data/$i /sd-ext/$i;
done;

###[ INTERNAL mtdblock5 STRICT ]###
# For performance, dalvik-cache should be on /sd-ext
###
for i in dalvik-cache;
do
#-- If Symlink in /data, delete it
if [ -h /sd-ext/$i ]
then
busybox rm /sd-ext/$i;
fi;

#-- If Directory Exists in /sd-ext, move it to /data
if [ -d /data/$i ]
then
busybox mv /data/$i /sd-ext/;
fi;

#-- If Directory Not Extst in /data, create it
if [ ! -d /sd-ext/$i ]
then
busybox mkdir /sd-ext/$i;
#-- Just Open All Permissions ;)
busybox chmod 0777 /sd-ext/$i;
fi;

#-- Update Symlinks ( reupdate was safer )
if [ ! -h /data/$i ]
then
busybox rm /data/$i;
fi;
busybox ln -s /sd-ext/$i /data/$i;
done;

###
# Now create symlink of the rest non Symlink Directories and Files on /sd-ext to /data
#
# ~ ALPHA02 - Fix ls to ls -a, it's ok, because we test -h for symlink
###
cd /sd-ext;
for i in `ls -a`;
do
if [ $i != ".." -a $i != "." ]
then
if [ ! -h /sd-ext/$i ]
then
if [ ! -h /data/$i ]
then
busybox ln -s /sd-ext/$i /data/$i;
fi;
fi;
fi;
done;
cd /;

###
# It should also need to create the rest non Symlink Directories and Files on /data to /sd-ext
# ~ ALPHA02 - Some Directory may be missing if we don't use it
###
cd /data;
for i in `ls -a`;
do
if [ $i != ".." -a $i != "." ]
then
if [ ! -h /data/$i ]
then
if [ ! -h /sd-ext/$i ]
then
busybox ln -s /data/$i /sd-ext/$i;
fi;
fi;
fi;
done;
cd /;

###
# Now Important Thing, is to move the com.htc* and com.android* data to /sd-ext (internal)
# For Good performance. So the system applications will run smooth.
#
# System application will read/write in Internal memory, and 3rd apps will run on sdcard
#
# Notice: Will be affected in 2nd boot :D, so Reboot the system after 1st boot...
###

#-- Prepare data_s in /sd-ext ( For system data )
if [ ! -d /sd-ext/data_s ]
then
busybox mkdir /sd-ext/data_s;
#-- Just Open All Permissions ;)
busybox chmod 0777 /sd-ext/data_s;
fi;

#-- Now Move All com.htc* and com.android* to Internal Memory
cd /data/data/;
for i in `ls -d com.htc* com.android*`;
do
#-- Only Non Symlink
if [ ! -h /data/data/$i ]
then
busybox mv /data/data/$i /sd-ext/data_s/;
fi;
done;

#-- Create Symlink of /data/data_s/* to /data/data/ (mmcblk0p2)
cd /sd-ext/data_s/
for i in `ls -d *`;
do
#-- Only If Symlink Not Exists
if [ ! -h /data/data/$i ]
then
busybox ln -s /sd-ext/data_s/$i /data/data/$i
fi;
done;

#-- Of Finished.... :D