use logical volumes for system and data, bring back datadata

* use lvm to split eMMC into 2 logical partitions
* use entire available space on OneNAND for /datadata

based on information from: http://bit.ly/OMny8Z

WARNING: WILL WIPE DATA

Change-Id: I3caeec096a6798afafaf03b2eb72c20580272682

1 files changed, 72 insertions, 0 deletions

diff --git a/setupdatadata.sh b/setupdatadata.sh
new file mode 100755
index 0000000..ce9c389
--- /dev/null
+++ b/setupdatadata.sh
@@ -0,0 +1,72 @@
+#!/system/bin/sh
+#
+# Setup /data/data based on whether the phone is encrypted or not
+# and migrate the data to the correct location on en/decryption
+# Encrypted => leave on /data/data (/datadata cannot be encrypted)
+# Unencrypted => symlink to /datadata for performance
+
+PATH=/system/bin/:/system/xbin/
+
+function migrate_datadata {
+    # Migrate data from /datadata to /data/data
+    if test -h /data/data ; then
+        rm /data/data
+        mkdir /data/data
+        chown system.system /data/data
+        chmod 0771 /data/data
+        cp -a /datadata/* /data/data/
+        touch /data/data/.nodatadata
+        rm -r /data/data/lost+found
+        busybox umount /datadata
+        erase_image datadata
+        busybox mount /datadata
+    fi
+}
+
+function migrate_cache {
+    if test -e /data/data/$1 ; then
+        if ! test -h /data/data/$1/cache ; then
+            OWNER="`ls -ld /data/data/$1/ | awk '{print $3}'`"
+            rm -r /data/data2/$1 # In case it exists
+            mkdir -p /data/data2/$1
+            chmod 751 /data/data2/$1
+            busybox mv -f /data/data/$1/cache /data/data2/$1/
+            ln -s /data/data2/$1/cache /data/data/$1/cache
+            chown $OWNER.$OWNER /data/data2/$1 /data/data2/$1/cache
+            busybox chown -h $OWNER.$OWNER /data/data/$1/cache
+        fi
+    else
+        # App was removed?
+        rm -r /data/data2/$1
+    fi
+}
+
+# There are 4 states which this script can be called from.
+# They can be detected using vold.decrypt and ro.crypto.state props
+
+CRYPTO_STATE="`getprop ro.crypto.state`"
+VOLD_DECRYPT="`getprop vold.decrypt`"
+
+if test "$CRYPTO_STATE" = "unencrypted" ; then
+    if test "$VOLD_DECRYPT" = "" ; then
+        # Normal unencrypted boot
+        if test -e /data/data/.nodatadata ; then
+            migrate_datadata
+        else
+            rmdir /data/data
+            ln -s /datadata /data/data
+
+            # Migrate download provider's cache out of /data/data because that's where market stores its downloads
+            migrate_cache com.android.providers.downloads
+            # GMail stores attachments in here
+            migrate_cache com.google.android.gm
+        fi
+    fi
+    # else: Encrypting, do nothing
+else
+    if test "$VOLD_DECRYPT" = "trigger_post_fs_data" ; then
+        # Encrypted boot (after decryption)
+        migrate_datadata
+    fi
+    # else: Encrypted boot (before decryption), do nothing
+fi