ext4 module 2.6.29 (enclair 2.1) without reflash (raw lag fix)

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I compiled ext4 module to work with enclair 2.1 kernel 2.6.29, tested with XXJF5 stock firmware. Need root access, tune2fs and mke2fs static binary (e2fsprog-bin.tgz.zip)

mkdir -p /system/lib/modules/2.6.29/

#copy module.tar.gz in /system/lib/modules/2.6.29/

cd /system/lib/modules/2.6.29/

tar zxvf module.tar.gz

insmod /system/lib/modules/2.6.29/kernel/fs/jbd2/jbd2.ko
insmod /system/lib/modules/2.6.29/kernel/lib/crc16.ko
insmod /system/lib/modules/2.6.29/kernel/fs/ext4/ext4.ko

if=/dev/zero of=/sdcard/sd/filesystem.ext4 bs=1048576 count=2048

losetup /dev/block/loop1 /sdcard/sd/filesystem.ext4
mke2fs -t ex4 /dev/block/loop1
tune2fs -c 0 -i 0 -m 0 /dev/block/loop1

mkdir /sdcard/sddata
mount -t ext4 /dev/block/loop1 /sdcard/sddata

cp -rp /data/data /sdcard/sddata
cp -rp /data/system /sdcard/sddata
cp -rp /data/dalvik-cache /sdcard/sddata
cp -rp /data/app /sdcard/sddata
cp -rp /data/app-private /sdcard/sddata

mount -t ext4 -o bind /sdcard/sddata/data /data/data
mount -t ext4 -o bind /sdcard/sddata/system /data/system
mount -t ext4 -o bind /sdcard/sddata/dalvik-cache /data/dalvik-cache
mount -t ext4 -o bind /sdcard/sddata/app /data/app
mount -t ext4 -o bind /sdcard/sddata/app-private /data/app-private


run your quadrant test, i got 1793. enjoy.

ps: if you want make it permanent look at RyanZA playlogos1 trick. Also make sure your ext4 filesystem is available at boot time instead /sdcard/sddata


Note:

- due its nature ext4 keep data in RAM much more than ext3 before writing on disk, therefore if a powerloss happens before data got written this may results in lost of data. (see delayed allocation). On the other hand a temporary file wont be written to disk, but kept on RAM avoiding read/write cycles. Inode reservation can increase performance as well.
- barrier can be disabled but this may result in a corrupt journal

explain please

you may want to use ext4 without reflash, and at the same time keep your /data untouchable, just in case you need a recovery backup. eg: if /sdcard got corrupt, system will mount your original /data. (desynced)

I had to disable vold, and mv /etc/vold.conf /etc/vold.old, otherwise it coundnt find /sdcard/filesystem.ext4 so I mount it just before everything.

userinit.sh
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/system/bin/mount -t vfat -o errors=remount-ro /dev/block/mmcblk1p1 /sdcard
insmod /system/lib/modules/2.6.29/kernel/fs/jbd2/jbd2.ko
insmod /system/lib/modules/2.6.29/kernel/lib/crc16.ko
insmod /system/lib/modules/2.6.29/kernel/fs/ext4/ext4.ko
/data/local/bin/losetup /dev/block/loop1 /sdcard/filesystem.ext4
/system/xbin/e2fsck -p /dev/block/loop1
/system/bin/mount -t ext4 /dev/block/loop1 /sdcard/sddata
/system/bin/mount -t ext4 -o bind /sdcard/sddata/data /data/data
/system/bin/mount -t ext4 -o bind /sdcard/sddata/system /data/system
/system/bin/mount -t ext4 -o bind /sdcard/sddata/dalvik-cache /data/dalvik-cache
/system/bin/mount -t ext4 -o bind /sdcard/sddata/app /data/app
/system/bin/mount -t ext4 -o bind /sdcard/sddata/app-private /data/app-private
--

mv /system/bin/playlogos1 /system/bin/playlogosnow

Do not forget to create /system/bin/playlogos1 as follow:

#!/system/bin/sh
sh /system/bin/userinit.sh
/system/bin/playlogosnow

I got 1858


this is just proof do not use on your device if you dont know what you doing. Since vold does not mount partition some application may not recognize /sdcard mounted that way.

id like to find a way to start vold before playlogos1 and resolve this issue, buts vold seems check argv[0] before start.

e2fsprogs recompiled as well ? In other words, will the e2fsprogs from cynogen work on ext4? These do use libs, btw.

I might build support for this into CFLagFix if I can freely use the files

yeah static bin.

Originally Posted by husq510

yeah static bin.

Just want to ask if it's ok to implament this in my lagfix zips

Ofc ill credit you

sure you can.

Thanks for the statically linked e2fsck

Nvm got it working on captivate also